sql_acl.cc 288 KB
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/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/*
  The privileges are saved in the following tables:
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  mysql/user	 ; super user who are allowed to do almost anything
  mysql/host	 ; host privileges. This is used if host is empty in mysql/db.
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  mysql/db	 ; database privileges / user

  data in tables is sorted according to how many not-wild-cards there is
  in the relevant fields. Empty strings comes last.
*/

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#include "my_global.h"                          /* NO_EMBEDDED_ACCESS_CHECKS */
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#include "sql_priv.h"
#include "sql_acl.h"         // MYSQL_DB_FIELD_COUNT, ACL_ACCESS
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#include "sql_base.h"                           // close_mysql_tables
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#include "key.h"             // key_copy, key_cmp_if_same, key_restore
#include "sql_show.h"        // append_identifier
#include "sql_table.h"                         // build_table_filename
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#include "hash_filo.h"
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#include "sql_parse.h"                          // check_access
#include "sql_view.h"                           // VIEW_ANY_ACL
#include "records.h"              // READ_RECORD, read_record_info,
                                  // init_read_record, end_read_record
#include "rpl_filter.h"           // rpl_filter
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#include <m_ctype.h>
#include <stdarg.h>
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#include "sp_head.h"
#include "sp.h"
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#include "transaction.h"
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#include "lock.h"                               // MYSQL_LOCK_IGNORE_TIMEOUT
#include "records.h"             // init_read_record, end_read_record
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#include <sql_common.h>
#include <mysql/plugin_auth.h>
#include "sql_connect.h"
#include "hostname.h"
#include "sql_db.h"
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bool mysql_user_table_is_in_short_password_format= false;

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static const
TABLE_FIELD_TYPE mysql_db_table_fields[MYSQL_DB_FIELD_COUNT] = {
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  {
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    { C_STRING_WITH_LEN("Host") },            
    { C_STRING_WITH_LEN("char(60)") },
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    {NULL, 0}
  }, 
  {
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    { C_STRING_WITH_LEN("Db") },            
    { C_STRING_WITH_LEN("char(64)") },
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    {NULL, 0}
  }, 
  {
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    { C_STRING_WITH_LEN("User") },
    { C_STRING_WITH_LEN("char(16)") },
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    {NULL, 0}
  },
  {
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    { C_STRING_WITH_LEN("Select_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Insert_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Update_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Delete_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Create_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Drop_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Grant_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("References_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Index_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Alter_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Create_tmp_table_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Lock_tables_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Create_view_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Show_view_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Create_routine_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Alter_routine_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Execute_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Event_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  },
  {
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    { C_STRING_WITH_LEN("Trigger_priv") },
    { C_STRING_WITH_LEN("enum('N','Y')") },
    { C_STRING_WITH_LEN("utf8") }
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  }
};

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const TABLE_FIELD_DEF
  mysql_db_table_def= {MYSQL_DB_FIELD_COUNT, mysql_db_table_fields};
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static LEX_STRING native_password_plugin_name= {
  C_STRING_WITH_LEN("mysql_native_password")
};
  
static LEX_STRING old_password_plugin_name= {
  C_STRING_WITH_LEN("mysql_old_password")
};
  
/// @todo make it configurable
LEX_STRING *default_auth_plugin_name= &native_password_plugin_name;

#ifndef NO_EMBEDDED_ACCESS_CHECKS
static plugin_ref old_password_plugin;
#endif
static plugin_ref native_password_plugin;

/* Classes */

struct acl_host_and_ip
{
  char *hostname;
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  long ip, ip_mask;                      // Used with masked ip:s
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};

class ACL_ACCESS {
public:
  ulong sort;
  ulong access;
};

/* ACL_HOST is used if no host is specified */

class ACL_HOST :public ACL_ACCESS
{
public:
  acl_host_and_ip host;
  char *db;
};

class ACL_USER :public ACL_ACCESS
{
public:
  acl_host_and_ip host;
  uint hostname_length;
  USER_RESOURCES user_resource;
  char *user;
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  uint8 salt[SCRAMBLE_LENGTH + 1];       // scrambled password in binary form
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  uint8 salt_len;        // 0 - no password, 4 - 3.20, 8 - 4.0,  20 - 4.1.1 
  enum SSL_type ssl_type;
  const char *ssl_cipher, *x509_issuer, *x509_subject;
  LEX_STRING plugin;
  LEX_STRING auth_string;

  ACL_USER *copy(MEM_ROOT *root)
  {
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    ACL_USER *dst= (ACL_USER *) alloc_root(root, sizeof(ACL_USER));
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    if (!dst)
      return 0;
    *dst= *this;
    dst->user= safe_strdup_root(root, user);
    dst->ssl_cipher= safe_strdup_root(root, ssl_cipher);
    dst->x509_issuer= safe_strdup_root(root, x509_issuer);
    dst->x509_subject= safe_strdup_root(root, x509_subject);
    if (plugin.str == native_password_plugin_name.str ||
        plugin.str == old_password_plugin_name.str)
      dst->plugin= plugin;
    else
      dst->plugin.str= strmake_root(root, plugin.str, plugin.length);
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    dst->auth_string.str= safe_strdup_root(root, auth_string.str);
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    dst->host.hostname= safe_strdup_root(root, host.hostname);
    return dst;
  }
};

class ACL_DB :public ACL_ACCESS
{
public:
  acl_host_and_ip host;
  char *user,*db;
};


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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static void update_hostname(acl_host_and_ip *host, const char *hostname);
static ulong get_sort(uint count,...);
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static bool compare_hostname(const acl_host_and_ip *host, const char *hostname,
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			     const char *ip);
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static bool show_proxy_grants (THD *thd, LEX_USER *user,
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                               char *buff, size_t buffsize);

class ACL_PROXY_USER :public ACL_ACCESS
{
  acl_host_and_ip host;
  const char *user;
  acl_host_and_ip proxied_host;
  const char *proxied_user;
  bool with_grant;

  typedef enum { 
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    MYSQL_PROXIES_PRIV_HOST, 
    MYSQL_PROXIES_PRIV_USER, 
    MYSQL_PROXIES_PRIV_PROXIED_HOST,
    MYSQL_PROXIES_PRIV_PROXIED_USER, 
    MYSQL_PROXIES_PRIV_WITH_GRANT,
    MYSQL_PROXIES_PRIV_GRANTOR,
    MYSQL_PROXIES_PRIV_TIMESTAMP } old_acl_proxy_users;
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public:
  ACL_PROXY_USER () {};

  void init(const char *host_arg, const char *user_arg,
       const char *proxied_host_arg, const char *proxied_user_arg,
       bool with_grant_arg)
  {
    user= (user_arg && *user_arg) ? user_arg : NULL;
    update_hostname (&host, 
                     (host_arg && *host_arg) ? host_arg : NULL);
    proxied_user= (proxied_user_arg && *proxied_user_arg) ? 
      proxied_user_arg : NULL;
    update_hostname (&proxied_host, 
                     (proxied_host_arg && *proxied_host_arg) ?
                     proxied_host_arg : NULL);
    with_grant= with_grant_arg;
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    sort= get_sort(4, host.hostname, user,
                   proxied_host.hostname, proxied_user);
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  }

  void init(MEM_ROOT *mem, const char *host_arg, const char *user_arg,
       const char *proxied_host_arg, const char *proxied_user_arg,
       bool with_grant_arg)
  {
    init ((host_arg && *host_arg) ? strdup_root (mem, host_arg) : NULL,
          (user_arg && *user_arg) ? strdup_root (mem, user_arg) : NULL,
          (proxied_host_arg && *proxied_host_arg) ? 
            strdup_root (mem, proxied_host_arg) : NULL,
          (proxied_user_arg && *proxied_user_arg) ? 
            strdup_root (mem, proxied_user_arg) : NULL,
          with_grant_arg);
  }

  void init(TABLE *table, MEM_ROOT *mem)
  {
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    init (get_field(mem, table->field[MYSQL_PROXIES_PRIV_HOST]),
          get_field(mem, table->field[MYSQL_PROXIES_PRIV_USER]),
          get_field(mem, table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]),
          get_field(mem, table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]),
          table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->val_int() != 0);
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  }

  bool get_with_grant() { return with_grant; }
  const char *get_user() { return user; }
  const char *get_host() { return host.hostname; }
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  const char *get_proxied_user() { return proxied_user; }
  const char *get_proxied_host() { return proxied_host.hostname; }
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  void set_user(MEM_ROOT *mem, const char *user_arg) 
  { 
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    user= user_arg && *user_arg ? strdup_root(mem, user_arg) : NULL;
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  }
  void set_host(MEM_ROOT *mem, const char *host_arg) 
  { 
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    update_hostname(&host, 
                    (host_arg && *host_arg) ? 
                    strdup_root(mem, host_arg) : NULL);
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  }

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  bool check_validity(bool check_no_resolve)
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  {
    if (check_no_resolve && 
        (hostname_requires_resolving(host.hostname) ||
         hostname_requires_resolving(proxied_host.hostname)))
    {
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      sql_print_warning("'proxies_priv' entry '%s@%s %s@%s' "
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                        "ignored in --skip-name-resolve mode.",
                        proxied_user ? proxied_user : "",
                        proxied_host.hostname ? proxied_host.hostname : "",
                        user ? user : "",
                        host.hostname ? host.hostname : "");
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      return TRUE;
    }
    return FALSE;
  }

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  bool matches(const char *host_arg, const char *user_arg, const char *ip_arg,
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                const char *proxied_user_arg)
  {
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    DBUG_ENTER("ACL_PROXY_USER::matches");
    DBUG_PRINT("info", ("compare_hostname(%s,%s,%s) &&"
                        "compare_hostname(%s,%s,%s) &&"
                        "wild_compare (%s,%s) &&"
                        "wild_compare (%s,%s)",
                        host.hostname ? host.hostname : "<NULL>",
                        host_arg ? host_arg : "<NULL>",
                        ip_arg ? ip_arg : "<NULL>",
                        proxied_host.hostname ? proxied_host.hostname : "<NULL>",
                        host_arg ? host_arg : "<NULL>",
                        ip_arg ? ip_arg : "<NULL>",
                        user_arg ? user_arg : "<NULL>",
                        user ? user : "<NULL>",
                        proxied_user_arg ? proxied_user_arg : "<NULL>",
                        proxied_user ? proxied_user : "<NULL>"));
    DBUG_RETURN(compare_hostname(&host, host_arg, ip_arg) &&
                compare_hostname(&proxied_host, host_arg, ip_arg) &&
                (!user ||
                 (user_arg && !wild_compare(user_arg, user, TRUE))) &&
                (!proxied_user || 
                 (proxied_user && !wild_compare(proxied_user_arg, 
                                                proxied_user, TRUE))));
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  }

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  inline static bool auth_element_equals(const char *a, const char *b)
  {
    return (a == b || (a != NULL && b != NULL && !strcmp(a,b)));
  }


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  bool pk_equals(ACL_PROXY_USER *grant)
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  {
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    DBUG_ENTER("pk_equals");
    DBUG_PRINT("info", ("strcmp(%s,%s) &&"
                        "strcmp(%s,%s) &&"
                        "wild_compare (%s,%s) &&"
                        "wild_compare (%s,%s)",
                        user ? user : "<NULL>",
                        grant->user ? grant->user : "<NULL>",
                        proxied_user ? proxied_user : "<NULL>",
                        grant->proxied_user ? grant->proxied_user : "<NULL>",
                        host.hostname ? host.hostname : "<NULL>",
                        grant->host.hostname ? grant->host.hostname : "<NULL>",
                        proxied_host.hostname ? proxied_host.hostname : "<NULL>",
                        grant->proxied_host.hostname ? 
                        grant->proxied_host.hostname : "<NULL>"));
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    DBUG_RETURN(auth_element_equals(user, grant->user) &&
                auth_element_equals(proxied_user, grant->proxied_user) &&
                auth_element_equals(host.hostname, grant->host.hostname) &&
                auth_element_equals(proxied_host.hostname, 
                                    grant->proxied_host.hostname));
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  }

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  bool granted_on(const char *host_arg, const char *user_arg)
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  {
    return (((!user && (!user_arg || !user_arg[0])) ||
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             (user && user_arg && !strcmp(user, user_arg))) &&
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            ((!host.hostname && (!host_arg || !host_arg[0])) ||
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             (host.hostname && host_arg && !strcmp(host.hostname, host_arg))));
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  }

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  void print_grant(String *str)
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  {
    str->append(STRING_WITH_LEN("GRANT PROXY ON '"));
    if (proxied_user)
      str->append(proxied_user, strlen(proxied_user));
    str->append(STRING_WITH_LEN("'@'"));
    if (proxied_host.hostname)
      str->append(proxied_host.hostname, strlen(proxied_host.hostname));
    str->append(STRING_WITH_LEN("' TO '"));
    if (user)
      str->append(user, strlen(user));
    str->append(STRING_WITH_LEN("'@'"));
    if (host.hostname)
      str->append(host.hostname, strlen(host.hostname));
    str->append(STRING_WITH_LEN("'"));
    if (with_grant)
      str->append(STRING_WITH_LEN(" WITH GRANT OPTION"));
  }

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  void set_data(ACL_PROXY_USER *grant)
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  {
    with_grant= grant->with_grant;
  }

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  static int store_pk(TABLE *table, 
                      const LEX_STRING *host, 
                      const LEX_STRING *user,
                      const LEX_STRING *proxied_host, 
                      const LEX_STRING *proxied_user)
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  {
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    DBUG_ENTER("ACL_PROXY_USER::store_pk");
    DBUG_PRINT("info", ("host=%s, user=%s, proxied_host=%s, proxied_user=%s",
                        host->str ? host->str : "<NULL>",
                        user->str ? user->str : "<NULL>",
                        proxied_host->str ? proxied_host->str : "<NULL>",
                        proxied_user->str ? proxied_user->str : "<NULL>"));
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    if (table->field[MYSQL_PROXIES_PRIV_HOST]->store(host->str, 
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                                                   host->length,
                                                   system_charset_info))
      DBUG_RETURN(TRUE);
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    if (table->field[MYSQL_PROXIES_PRIV_USER]->store(user->str, 
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                                                   user->length,
                                                   system_charset_info))
      DBUG_RETURN(TRUE);
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    if (table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]->store(proxied_host->str,
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                                                           proxied_host->length,
                                                           system_charset_info))
      DBUG_RETURN(TRUE);
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    if (table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]->store(proxied_user->str,
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                                                           proxied_user->length,
                                                           system_charset_info))
      DBUG_RETURN(TRUE);

    DBUG_RETURN(FALSE);
  }

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  static int store_data_record(TABLE *table,
                               const LEX_STRING *host,
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                               const LEX_STRING *user,
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                               const LEX_STRING *proxied_host,
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                               const LEX_STRING *proxied_user,
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                               bool with_grant,
                               const char *grantor)
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  {
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    DBUG_ENTER("ACL_PROXY_USER::store_pk");
    if (store_pk(table,  host, user, proxied_host, proxied_user))
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      DBUG_RETURN(TRUE);
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    DBUG_PRINT("info", ("with_grant=%s", with_grant ? "TRUE" : "FALSE"));
    if (table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->store(with_grant ? 1 : 0, 
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                                                         TRUE))
      DBUG_RETURN(TRUE);
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    if (table->field[MYSQL_PROXIES_PRIV_GRANTOR]->store(grantor, 
                                                        strlen(grantor),
                                                        system_charset_info))
      DBUG_RETURN(TRUE);
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    DBUG_RETURN(FALSE);
  }
};
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#define FIRST_NON_YN_FIELD 26

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class acl_entry :public hash_filo_element
{
public:
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  ulong access;
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  uint16 length;
  char key[1];					// Key will be stored here
};

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static uchar* acl_entry_get_key(acl_entry *entry, size_t *length,
                                my_bool not_used __attribute__((unused)))
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{
  *length=(uint) entry->length;
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  return (uchar*) entry->key;
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}

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#define IP_ADDR_STRLEN (3 + 1 + 3 + 1 + 3 + 1 + 3)
#define ACL_KEY_LENGTH (IP_ADDR_STRLEN + 1 + NAME_LEN + \
                        1 + USERNAME_LENGTH + 1)
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#if defined(HAVE_OPENSSL)
/*
  Without SSL the handshake consists of one packet. This packet
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  has both client capabilities and scrambled password.
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  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
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  is in the second packet and client_capabilities field will be ignored.
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  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
#else
#define MIN_HANDSHAKE_SIZE      6
#endif /* HAVE_OPENSSL && !EMBEDDED_LIBRARY */

541
static DYNAMIC_ARRAY acl_hosts, acl_users, acl_dbs, acl_proxy_users;
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static MEM_ROOT mem, memex;
static bool initialized=0;
static bool allow_all_hosts=1;
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static HASH acl_check_hosts, column_priv_hash, proc_priv_hash, func_priv_hash;
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static DYNAMIC_ARRAY acl_wild_hosts;
static hash_filo *acl_cache;
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static uint grant_version=0; /* Version of priv tables. incremented by acl_load */
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static ulong get_access(TABLE *form,uint fieldnr, uint *next_field=0);
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static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b);
static ulong get_sort(uint count,...);
static void init_check_host(void);
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static void rebuild_check_host(void);
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static ACL_USER *find_acl_user(const char *host, const char *user,
                               my_bool exact);
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static bool update_user_table(THD *thd, TABLE *table,
                              const char *host, const char *user,
558
			      const char *new_password, uint new_password_len);
559
static my_bool acl_load(THD *thd, TABLE_LIST *tables);
560
static my_bool grant_load(THD *thd, TABLE_LIST *tables);
561
static inline void get_grantor(THD *thd, char* grantor);
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/*
  Convert scrambled password to binary form, according to scramble type, 
  Binary form is stored in user.salt.
*/

static
void
set_user_salt(ACL_USER *acl_user, const char *password, uint password_len)
{
  if (password_len == SCRAMBLED_PASSWORD_CHAR_LENGTH)
  {
    get_salt_from_password(acl_user->salt, password);
    acl_user->salt_len= SCRAMBLE_LENGTH;
  }
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  else if (password_len == SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
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  {
    get_salt_from_password_323((ulong *) acl_user->salt, password);
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    acl_user->salt_len= SCRAMBLE_LENGTH_323;
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  }
  else
    acl_user->salt_len= 0;
}

586
/*
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  Initialize structures responsible for user/db-level privilege checking and
  load privilege information for them from tables in the 'mysql' database.
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  SYNOPSIS
    acl_init()
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      dont_read_acl_tables  TRUE if we want to skip loading data from
                            privilege tables and disable privilege checking.

  NOTES
    This function is mostly responsible for preparatory steps, main work
    on initialization and grants loading is done in acl_reload().
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  RETURN VALUES
    0	ok
    1	Could not initialize grant's
*/

604
my_bool acl_init(bool dont_read_acl_tables)
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{
606
  THD  *thd;
607
  my_bool return_val;
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  DBUG_ENTER("acl_init");

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  acl_cache= new hash_filo(ACL_CACHE_SIZE, 0, 0,
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                           (my_hash_get_key) acl_entry_get_key,
                           (my_hash_free_key) free,
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                           &my_charset_utf8_bin);
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  /*
    cache built-in native authentication plugins,
    to avoid hash searches and a global mutex lock on every connect
  */
  native_password_plugin= my_plugin_lock_by_name(0,
           &native_password_plugin_name, MYSQL_AUTHENTICATION_PLUGIN);
  old_password_plugin= my_plugin_lock_by_name(0,
           &old_password_plugin_name, MYSQL_AUTHENTICATION_PLUGIN);

  if (!native_password_plugin || !old_password_plugin)
    DBUG_RETURN(1);

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  if (dont_read_acl_tables)
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  {
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    DBUG_RETURN(0); /* purecov: tested */
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  }

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  /*
    To be able to run this from boot, we allocate a temporary THD
  */
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  if (!(thd=new THD))
    DBUG_RETURN(1); /* purecov: inspected */
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  thd->thread_stack= (char*) &thd;
638
  thd->store_globals();
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  /*
    It is safe to call acl_reload() since acl_* arrays and hashes which
    will be freed there are global static objects and thus are initialized
    by zeros at startup.
  */
  return_val= acl_reload(thd);
  delete thd;
  /* Remember that we don't have a THD */
  my_pthread_setspecific_ptr(THR_THD,  0);
  DBUG_RETURN(return_val);
}

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/**
  Choose from either native or old password plugins when assigning a password
*/

static bool
set_user_plugin (ACL_USER *user, int password_len)
{
  switch (password_len) 
  {
  case 0: /* no password */
  case SCRAMBLED_PASSWORD_CHAR_LENGTH:
    user->plugin= native_password_plugin_name;
    return FALSE;
  case SCRAMBLED_PASSWORD_CHAR_LENGTH_323:
    user->plugin= old_password_plugin_name;
    return FALSE;
  case 45: /* 4.1: to be removed */
    sql_print_warning("Found 4.1.0 style password for user '%s@%s'. "
                      "Ignoring user. "
                      "You should change password for this user.",
                      user->user ? user->user : "",
                      user->host.hostname ? user->host.hostname : "");
    return TRUE;
  default:
    sql_print_warning("Found invalid password for user: '%s@%s'; "
                      "Ignoring user", user->user ? user->user : "",
                      user->host.hostname ? user->host.hostname : "");
    return TRUE;
  }
}

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/*
  Initialize structures responsible for user/db-level privilege checking
  and load information about grants from open privilege tables.

  SYNOPSIS
    acl_load()
      thd     Current thread
      tables  List containing open "mysql.host", "mysql.user" and
              "mysql.db" tables.

  RETURN VALUES
    FALSE  Success
    TRUE   Error
*/

static my_bool acl_load(THD *thd, TABLE_LIST *tables)
{
  TABLE *table;
  READ_RECORD read_record_info;
702
  my_bool return_val= TRUE;
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  bool check_no_resolve= specialflag & SPECIAL_NO_RESOLVE;
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  char tmp_name[NAME_LEN+1];
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  int password_length;
706
  ulong old_sql_mode= thd->variables.sql_mode;
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  DBUG_ENTER("acl_load");

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  thd->variables.sql_mode&= ~MODE_PAD_CHAR_TO_FULL_LENGTH;

711
  grant_version++; /* Privileges updated */
712

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  acl_cache->clear(1);				// Clear locked hostname cache

715
  init_sql_alloc(&mem, ACL_ALLOC_BLOCK_SIZE, 0);
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  init_read_record(&read_record_info,thd,table= tables[0].table,NULL,1,0, 
                   FALSE);
718
  table->use_all_columns();
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  (void) my_init_dynamic_array(&acl_hosts,sizeof(ACL_HOST),20,50);
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  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_HOST host;
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    update_hostname(&host.host,get_field(&mem, table->field[0]));
    host.db=	 get_field(&mem, table->field[1]);
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    if (lower_case_table_names && host.db)
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    {
      /*
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        convert db to lower case and give a warning if the db wasn't
        already in lower case
730
      */
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      (void) strmov(tmp_name, host.db);
      my_casedn_str(files_charset_info, host.db);
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      if (strcmp(host.db, tmp_name) != 0)
        sql_print_warning("'host' entry '%s|%s' had database in mixed "
                          "case that has been forced to lowercase because "
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                          "lower_case_table_names is set. It will not be "
                          "possible to remove this privilege using REVOKE.",
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                          host.host.hostname ? host.host.hostname : "",
                          host.db ? host.db : "");
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    }
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    host.access= get_access(table,2);
    host.access= fix_rights_for_db(host.access);
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    host.sort=	 get_sort(2,host.host.hostname,host.db);
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    if (check_no_resolve && hostname_requires_resolving(host.host.hostname))
    {
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      sql_print_warning("'host' entry '%s|%s' "
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		      "ignored in --skip-name-resolve mode.",
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			host.host.hostname ? host.host.hostname : "",
			host.db ? host.db : "");
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      continue;
    }
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#ifndef TO_BE_REMOVED
753
    if (table->s->fields == 8)
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    {						// Without grant
      if (host.access & CREATE_ACL)
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	host.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL | CREATE_TMP_ACL;
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    }
#endif
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    (void) push_dynamic(&acl_hosts,(uchar*) &host);
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  }
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  my_qsort((uchar*) dynamic_element(&acl_hosts,0,ACL_HOST*),acl_hosts.elements,
	   sizeof(ACL_HOST),(qsort_cmp) acl_compare);
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  end_read_record(&read_record_info);
  freeze_size(&acl_hosts);

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  init_read_record(&read_record_info,thd,table=tables[1].table,NULL,1,0,FALSE);
767
  table->use_all_columns();
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  (void) my_init_dynamic_array(&acl_users,sizeof(ACL_USER),50,100);
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  password_length= table->field[2]->field_length /
    table->field[2]->charset()->mbmaxlen;
  if (password_length < SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
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  {
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    sql_print_error("Fatal error: mysql.user table is damaged or in "
                    "unsupported 3.20 format.");
    goto end;
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  }

778
  DBUG_PRINT("info",("user table fields: %d, password length: %d",
779
		     table->s->fields, password_length));
780

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  mysql_mutex_lock(&LOCK_global_system_variables);
782
  if (password_length < SCRAMBLED_PASSWORD_CHAR_LENGTH)
783
  {
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    if (opt_secure_auth)
    {
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      mysql_mutex_unlock(&LOCK_global_system_variables);
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      sql_print_error("Fatal error: mysql.user table is in old format, "
                      "but server started with --secure-auth option.");
      goto end;
    }
791
    mysql_user_table_is_in_short_password_format= true;
792
    if (global_system_variables.old_passwords)
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      mysql_mutex_unlock(&LOCK_global_system_variables);
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    else
    {
      global_system_variables.old_passwords= 1;
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      mysql_mutex_unlock(&LOCK_global_system_variables);
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      sql_print_warning("mysql.user table is not updated to new password format; "
                        "Disabling new password usage until "
                        "mysql_fix_privilege_tables is run");
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    }
    thd->variables.old_passwords= 1;
  }
  else
805
  {
806
    mysql_user_table_is_in_short_password_format= false;
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    mysql_mutex_unlock(&LOCK_global_system_variables);
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  }

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  allow_all_hosts=0;
  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_USER user;
814
    bzero(&user, sizeof(user));
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    update_hostname(&user.host, get_field(&mem, table->field[0]));
    user.user= get_field(&mem, table->field[1]);
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    if (check_no_resolve && hostname_requires_resolving(user.host.hostname))
    {
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      sql_print_warning("'user' entry '%s@%s' "
                        "ignored in --skip-name-resolve mode.",
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			user.user ? user.user : "",
			user.host.hostname ? user.host.hostname : "");
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      continue;
    }

826
    char *password= get_field(&mem, table->field[2]);
827
    uint password_len= password ? strlen(password) : 0;
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    user.auth_string.str= password ? password : const_cast<char*>("");
    user.auth_string.length= password_len;
830
    set_user_salt(&user, password, password_len);
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    if (set_user_plugin(&user, password_len))
      continue;
    
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    {
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      uint next_field;
      user.access= get_access(table,3,&next_field) & GLOBAL_ACLS;
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      /*
        if it is pre 5.0.1 privilege table then map CREATE privilege on
        CREATE VIEW & SHOW VIEW privileges
      */
842
      if (table->s->fields <= 31 && (user.access & CREATE_ACL))
843
        user.access|= (CREATE_VIEW_ACL | SHOW_VIEW_ACL);
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      /*
        if it is pre 5.0.2 privilege table then map CREATE/ALTER privilege on
        CREATE PROCEDURE & ALTER PROCEDURE privileges
      */
849
      if (table->s->fields <= 33 && (user.access & CREATE_ACL))
850
        user.access|= CREATE_PROC_ACL;
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      if (table->s->fields <= 33 && (user.access & ALTER_ACL))
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        user.access|= ALTER_PROC_ACL;

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      /*
        pre 5.0.3 did not have CREATE_USER_ACL
      */
      if (table->s->fields <= 36 && (user.access & GRANT_ACL))
        user.access|= CREATE_USER_ACL;

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      /*
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        if it is pre 5.1.6 privilege table then map CREATE privilege on
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        CREATE|ALTER|DROP|EXECUTE EVENT
      */
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      if (table->s->fields <= 37 && (user.access & SUPER_ACL))
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        user.access|= EVENT_ACL;

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      /*
        if it is pre 5.1.6 privilege then map TRIGGER privilege on CREATE.
      */
      if (table->s->fields <= 38 && (user.access & SUPER_ACL))
        user.access|= TRIGGER_ACL;

874 875 876
      user.sort= get_sort(2,user.host.hostname,user.user);
      user.hostname_length= (user.host.hostname ?
                             (uint) strlen(user.host.hostname) : 0);
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      /* Starting from 4.0.2 we have more fields */
      if (table->s->fields >= 31)
880
      {
881
        char *ssl_type=get_field(thd->mem_root, table->field[next_field++]);
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        if (!ssl_type)
          user.ssl_type=SSL_TYPE_NONE;
        else if (!strcmp(ssl_type, "ANY"))
          user.ssl_type=SSL_TYPE_ANY;
        else if (!strcmp(ssl_type, "X509"))
          user.ssl_type=SSL_TYPE_X509;
        else  /* !strcmp(ssl_type, "SPECIFIED") */
          user.ssl_type=SSL_TYPE_SPECIFIED;

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        user.ssl_cipher=   get_field(&mem, table->field[next_field++]);
        user.x509_issuer=  get_field(&mem, table->field[next_field++]);
        user.x509_subject= get_field(&mem, table->field[next_field++]);
894

895
        char *ptr = get_field(thd->mem_root, table->field[next_field++]);
896
        user.user_resource.questions=ptr ? atoi(ptr) : 0;
897
        ptr = get_field(thd->mem_root, table->field[next_field++]);
898
        user.user_resource.updates=ptr ? atoi(ptr) : 0;
899
        ptr = get_field(thd->mem_root, table->field[next_field++]);
900
        user.user_resource.conn_per_hour= ptr ? atoi(ptr) : 0;
901
        if (user.user_resource.questions || user.user_resource.updates ||
902
            user.user_resource.conn_per_hour)
903
          mqh_used=1;
904

905
        if (table->s->fields >= 36)
906 907
        {
          /* Starting from 5.0.3 we have max_user_connections field */
908
          ptr= get_field(thd->mem_root, table->field[next_field++]);
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          user.user_resource.user_conn= ptr ? atoi(ptr) : 0;
        }
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        if (table->s->fields >= 41)
        {
          /* We may have plugin & auth_String fields */
          char *tmpstr= get_field(&mem, table->field[next_field++]);
          if (tmpstr)
          {
            if (user.auth_string.length)
            {
              sql_print_warning("'user' entry '%s@%s' has both a password "
                                "and an authentication plugin specified. The "
                                "password will be ignored.",
                                user.user ? user.user : "",
                                user.host.hostname ? user.host.hostname : "");
            }
            if (my_strcasecmp(system_charset_info, tmpstr,
                              native_password_plugin_name.str) == 0)
              user.plugin= native_password_plugin_name;
            else
              if (my_strcasecmp(system_charset_info, tmpstr,
                                old_password_plugin_name.str) == 0)
                user.plugin= old_password_plugin_name;
              else
              {
                user.plugin.str= tmpstr;
                user.plugin.length= strlen(tmpstr);
              }
            user.auth_string.str= get_field(&mem, table->field[next_field++]);
            if (!user.auth_string.str)
              user.auth_string.str= const_cast<char*>("");
            user.auth_string.length= strlen(user.auth_string.str);
          }
        }
944
      }
945 946 947
      else
      {
        user.ssl_type=SSL_TYPE_NONE;
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#ifndef TO_BE_REMOVED
949
        if (table->s->fields <= 13)
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        {						// Without grant
          if (user.access & CREATE_ACL)
            user.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL;
        }
        /* Convert old privileges */
        user.access|= LOCK_TABLES_ACL | CREATE_TMP_ACL | SHOW_DB_ACL;
        if (user.access & FILE_ACL)
          user.access|= REPL_CLIENT_ACL | REPL_SLAVE_ACL;
        if (user.access & PROCESS_ACL)
          user.access|= SUPER_ACL | EXECUTE_ACL;
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#endif
961
      }
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      (void) push_dynamic(&acl_users,(uchar*) &user);
963 964
      if (!user.host.hostname ||
	  (user.host.hostname[0] == wild_many && !user.host.hostname[1]))
965
        allow_all_hosts=1;			// Anyone can connect
966
    }
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  }
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  my_qsort((uchar*) dynamic_element(&acl_users,0,ACL_USER*),acl_users.elements,
	   sizeof(ACL_USER),(qsort_cmp) acl_compare);
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  end_read_record(&read_record_info);
  freeze_size(&acl_users);
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973
  init_read_record(&read_record_info,thd,table=tables[2].table,NULL,1,0,FALSE);
974
  table->use_all_columns();
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  (void) my_init_dynamic_array(&acl_dbs,sizeof(ACL_DB),50,100);
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  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_DB db;
979 980
    update_hostname(&db.host,get_field(&mem, table->field[MYSQL_DB_FIELD_HOST]));
    db.db=get_field(&mem, table->field[MYSQL_DB_FIELD_DB]);
981 982
    if (!db.db)
    {
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983
      sql_print_warning("Found an entry in the 'db' table with empty database name; Skipped");
984
      continue;
985
    }
986
    db.user=get_field(&mem, table->field[MYSQL_DB_FIELD_USER]);
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    if (check_no_resolve && hostname_requires_resolving(db.host.hostname))
    {
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      sql_print_warning("'db' entry '%s %s@%s' "
		        "ignored in --skip-name-resolve mode.",
991 992 993
		        db.db,
			db.user ? db.user : "",
			db.host.hostname ? db.host.hostname : "");
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994 995
      continue;
    }
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996 997
    db.access=get_access(table,3);
    db.access=fix_rights_for_db(db.access);
998 999 1000
    if (lower_case_table_names)
    {
      /*
1001 1002
        convert db to lower case and give a warning if the db wasn't
        already in lower case
1003 1004
      */
      (void)strmov(tmp_name, db.db);
1005
      my_casedn_str(files_charset_info, db.db);
1006 1007 1008 1009
      if (strcmp(db.db, tmp_name) != 0)
      {
        sql_print_warning("'db' entry '%s %s@%s' had database in mixed "
                          "case that has been forced to lowercase because "
1010 1011
                          "lower_case_table_names is set. It will not be "
                          "possible to remove this privilege using REVOKE.",
1012 1013 1014
		          db.db,
			  db.user ? db.user : "",
			  db.host.hostname ? db.host.hostname : "");
1015 1016
      }
    }
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1017 1018
    db.sort=get_sort(3,db.host.hostname,db.db,db.user);
#ifndef TO_BE_REMOVED
1019
    if (table->s->fields <=  9)
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1020 1021 1022 1023 1024
    {						// Without grant
      if (db.access & CREATE_ACL)
	db.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL;
    }
#endif
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    (void) push_dynamic(&acl_dbs,(uchar*) &db);
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1026
  }
1027 1028
  my_qsort((uchar*) dynamic_element(&acl_dbs,0,ACL_DB*),acl_dbs.elements,
	   sizeof(ACL_DB),(qsort_cmp) acl_compare);
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1029 1030
  end_read_record(&read_record_info);
  freeze_size(&acl_dbs);
1031

1032 1033
  (void) my_init_dynamic_array(&acl_proxy_users, sizeof(ACL_PROXY_USER), 
                               50, 100);
1034
  if (tables[3].table)
1035
  {
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
    init_read_record(&read_record_info, thd, table= tables[3].table, NULL, 1, 
                     0, FALSE);
    table->use_all_columns();
    while (!(read_record_info.read_record(&read_record_info)))
    {
      ACL_PROXY_USER proxy;
      proxy.init(table, &mem);
      if (proxy.check_validity(check_no_resolve))
        continue;
      if (push_dynamic(&acl_proxy_users, (uchar*) &proxy))
      {
        end_read_record(&read_record_info);
        goto end;
      }
    }
    my_qsort((uchar*) dynamic_element(&acl_proxy_users, 0, ACL_PROXY_USER*),
             acl_proxy_users.elements,
             sizeof(ACL_PROXY_USER), (qsort_cmp) acl_compare);
    end_read_record(&read_record_info);
  }
  else
  {
    sql_print_error("Missing system table mysql.proxies_priv; "
                    "please run mysql_upgrade to create it");
1060 1061 1062
  }
  freeze_size(&acl_proxy_users);

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1063 1064
  init_check_host();

1065
  initialized=1;
1066
  return_val= FALSE;
1067 1068

end:
1069
  thd->variables.sql_mode= old_sql_mode;
1070
  DBUG_RETURN(return_val);
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1071 1072 1073 1074 1075
}


void acl_free(bool end)
{
1076
  free_root(&mem,MYF(0));
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1077 1078 1079 1080
  delete_dynamic(&acl_hosts);
  delete_dynamic(&acl_users);
  delete_dynamic(&acl_dbs);
  delete_dynamic(&acl_wild_hosts);
1081
  delete_dynamic(&acl_proxy_users);
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1082
  my_hash_free(&acl_check_hosts);
1083 1084
  plugin_unlock(0, native_password_plugin);
  plugin_unlock(0, old_password_plugin);
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1085 1086 1087 1088 1089 1090 1091 1092 1093
  if (!end)
    acl_cache->clear(1); /* purecov: inspected */
  else
  {
    delete acl_cache;
    acl_cache=0;
  }
}

1094 1095

/*
1096 1097
  Forget current user/db-level privileges and read new privileges
  from the privilege tables.
1098 1099 1100

  SYNOPSIS
    acl_reload()
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
      thd  Current thread

  NOTE
    All tables of calling thread which were open and locked by LOCK TABLES
    statement will be unlocked and closed.
    This function is also used for initialization of structures responsible
    for user/db-level privilege checking.

  RETURN VALUE
    FALSE  Success
    TRUE   Failure
1112
*/
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1113

1114
my_bool acl_reload(THD *thd)
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1115
{
1116
  TABLE_LIST tables[4];
1117
  DYNAMIC_ARRAY old_acl_hosts, old_acl_users, old_acl_dbs, old_acl_proxy_users;
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1118 1119
  MEM_ROOT old_mem;
  bool old_initialized;
1120
  my_bool return_val= TRUE;
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1121 1122
  DBUG_ENTER("acl_reload");

1123 1124 1125 1126
  /*
    To avoid deadlocks we should obtain table locks before
    obtaining acl_cache->lock mutex.
  */
1127 1128 1129 1130 1131 1132
  tables[0].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("host"), "host", TL_READ);
  tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("user"), "user", TL_READ);
  tables[2].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("db"), "db", TL_READ);
1133
  tables[3].init_one_table(C_STRING_WITH_LEN("mysql"),
1134 1135
                           C_STRING_WITH_LEN("proxies_priv"), 
                           "proxies_priv", TL_READ);
1136 1137 1138
  tables[0].next_local= tables[0].next_global= tables + 1;
  tables[1].next_local= tables[1].next_global= tables + 2;
  tables[2].next_local= tables[2].next_global= tables + 3;
1139 1140
  tables[0].open_type= tables[1].open_type= tables[2].open_type= 
  tables[3].open_type= OT_BASE_ONLY;
1141
  tables[3].open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
1142

1143
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
1144
  {
1145 1146 1147 1148
    /*
      Execution might have been interrupted; only print the error message
      if an error condition has been raised.
    */
1149
    if (thd->stmt_da->is_error())
1150
      sql_print_error("Fatal error: Can't open and lock privilege tables: %s",
1151
                      thd->stmt_da->message());
1152 1153 1154
    goto end;
  }

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1155
  if ((old_initialized=initialized))
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    mysql_mutex_lock(&acl_cache->lock);
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1157

1158 1159 1160 1161 1162
  old_acl_hosts= acl_hosts;
  old_acl_users= acl_users;
  old_acl_proxy_users= acl_proxy_users;
  old_acl_dbs= acl_dbs;
  old_mem= mem;
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1163
  delete_dynamic(&acl_wild_hosts);
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1164
  my_hash_free(&acl_check_hosts);
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1165

1166
  if ((return_val= acl_load(thd, tables)))
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1167
  {					// Error. Revert to old list
1168
    DBUG_PRINT("error",("Reverting to old privileges"));
1169
    acl_free();				/* purecov: inspected */
1170 1171 1172 1173 1174
    acl_hosts= old_acl_hosts;
    acl_users= old_acl_users;
    acl_proxy_users= old_acl_proxy_users;
    acl_dbs= old_acl_dbs;
    mem= old_mem;
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1175 1176 1177 1178
    init_check_host();
  }
  else
  {
1179
    free_root(&old_mem,MYF(0));
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1180 1181
    delete_dynamic(&old_acl_hosts);
    delete_dynamic(&old_acl_users);
1182
    delete_dynamic(&old_acl_proxy_users);
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1183 1184 1185
    delete_dynamic(&old_acl_dbs);
  }
  if (old_initialized)
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1186
    mysql_mutex_unlock(&acl_cache->lock);
1187
end:
1188
  close_mysql_tables(thd);
1189
  DBUG_RETURN(return_val);
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1190 1191 1192
}


1193 1194
/*
  Get all access bits from table after fieldnr
1195 1196

  IMPLEMENTATION
1197 1198
  We know that the access privileges ends when there is no more fields
  or the field is not an enum with two elements.
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209

  SYNOPSIS
    get_access()
    form        an open table to read privileges from.
                The record should be already read in table->record[0]
    fieldnr     number of the first privilege (that is ENUM('N','Y') field
    next_field  on return - number of the field next to the last ENUM
                (unless next_field == 0)

  RETURN VALUE
    privilege mask
1210
*/
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1211

1212
static ulong get_access(TABLE *form, uint fieldnr, uint *next_field)
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1213
{
1214
  ulong access_bits=0,bit;
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  char buff[2];
1216
  String res(buff,sizeof(buff),&my_charset_latin1);
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1217 1218
  Field **pos;

1219
  for (pos=form->field+fieldnr, bit=1;
1220
       *pos && (*pos)->real_type() == MYSQL_TYPE_ENUM &&
1221
	 ((Field_enum*) (*pos))->typelib->count == 2 ;
1222
       pos++, fieldnr++, bit<<=1)
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1223
  {
1224
    (*pos)->val_str(&res);
1225
    if (my_toupper(&my_charset_latin1, res[0]) == 'Y')
1226
      access_bits|= bit;
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1227
  }
1228 1229
  if (next_field)
    *next_field=fieldnr;
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1230 1231 1232 1233 1234
  return access_bits;
}


/*
1235 1236 1237 1238 1239
  Return a number which, if sorted 'desc', puts strings in this order:
    no wildcards
    wildcards
    empty string
*/
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1240 1241 1242 1243 1244 1245 1246

static ulong get_sort(uint count,...)
{
  va_list args;
  va_start(args,count);
  ulong sort=0;

1247 1248 1249
  /* Should not use this function with more than 4 arguments for compare. */
  DBUG_ASSERT(count <= 4);

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1250 1251
  while (count--)
  {
1252 1253 1254
    char *start, *str= va_arg(args,char*);
    uint chars= 0;
    uint wild_pos= 0;           /* first wildcard position */
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    if ((start= str))
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1257 1258 1259
    {
      for (; *str ; str++)
      {
1260 1261 1262
        if (*str == wild_prefix && str[1])
          str++;
        else if (*str == wild_many || *str == wild_one)
1263
        {
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          wild_pos= (uint) (str - start) + 1;
1265 1266
          break;
        }
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        chars= 128;                             // Marker that chars existed
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1268 1269
      }
    }
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1270
    sort= (sort << 8) + (wild_pos ? min(wild_pos, 127) : chars);
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1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
  }
  va_end(args);
  return sort;
}


static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b)
{
  if (a->sort > b->sort)
    return -1;
  if (a->sort < b->sort)
    return 1;
  return 0;
}

1286

1287
/*
1288
  Gets user credentials without authentication and resource limit checks.
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1289

1290
  SYNOPSIS
1291
    acl_getroot()
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
      sctx               Context which should be initialized
      user               user name
      host               host name
      ip                 IP
      db                 current data base name

  RETURN
    FALSE  OK
    TRUE   Error
*/

1303 1304
bool acl_getroot(Security_context *sctx, char *user, char *host,
                 char *ip, char *db)
1305 1306
{
  int res= 1;
1307
  uint i;
1308
  ACL_USER *acl_user= 0;
1309
  DBUG_ENTER("acl_getroot");
1310

1311 1312
  DBUG_PRINT("enter", ("Host: '%s', Ip: '%s', User: '%s', db: '%s'",
                       (host ? host : "(NULL)"), (ip ? ip : "(NULL)"),
1313
                       user, (db ? db : "(NULL)")));
1314 1315 1316 1317 1318
  sctx->user= user;
  sctx->host= host;
  sctx->ip= ip;
  sctx->host_or_ip= host ? host : (ip ? ip : "");

1319 1320
  if (!initialized)
  {
1321
    /*
1322 1323
      here if mysqld's been started with --skip-grant-tables option.
    */
1324
    sctx->skip_grants();
1325
    DBUG_RETURN(FALSE);
1326 1327
  }

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1328
  mysql_mutex_lock(&acl_cache->lock);
1329

1330 1331
  sctx->master_access= 0;
  sctx->db_access= 0;
1332
  *sctx->priv_user= *sctx->priv_host= 0;
1333

1334 1335 1336
  /*
     Find acl entry in user database.
     This is specially tailored to suit the check we do for CALL of
1337
     a stored procedure; user is set to what is actually a
1338 1339
     priv_user, which can be ''.
  */
1340
  for (i=0 ; i < acl_users.elements ; i++)
1341
  {
1342 1343 1344
    ACL_USER *acl_user_tmp= dynamic_element(&acl_users,i,ACL_USER*);
    if ((!acl_user_tmp->user && !user[0]) ||
        (acl_user_tmp->user && strcmp(user, acl_user_tmp->user) == 0))
1345
    {
1346
      if (compare_hostname(&acl_user_tmp->host, host, ip))
1347
      {
1348 1349 1350
        acl_user= acl_user_tmp;
        res= 0;
        break;
1351 1352 1353 1354 1355 1356
      }
    }
  }

  if (acl_user)
  {
1357 1358 1359 1360
    for (i=0 ; i < acl_dbs.elements ; i++)
    {
      ACL_DB *acl_db= dynamic_element(&acl_dbs, i, ACL_DB*);
      if (!acl_db->user ||
1361
	  (user && user[0] && !strcmp(user, acl_db->user)))
1362
      {
1363
	if (compare_hostname(&acl_db->host, host, ip))
1364
	{
1365
	  if (!acl_db->db || (db && !wild_compare(db, acl_db->db, 0)))
1366
	  {
1367
	    sctx->db_access= acl_db->access;
1368 1369 1370 1371 1372
	    break;
	  }
	}
      }
    }
1373
    sctx->master_access= acl_user->access;
1374 1375 1376 1377 1378

    if (acl_user->user)
      strmake(sctx->priv_user, user, USERNAME_LENGTH);
    else
      *sctx->priv_user= 0;
1379 1380

    if (acl_user->host.hostname)
1381
      strmake(sctx->priv_host, acl_user->host.hostname, MAX_HOSTNAME - 1);
1382
    else
1383
      *sctx->priv_host= 0;
1384
  }
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1385
  mysql_mutex_unlock(&acl_cache->lock);
1386 1387 1388
  DBUG_RETURN(res);
}

1389 1390
static uchar* check_get_key(ACL_USER *buff, size_t *length,
                            my_bool not_used __attribute__((unused)))
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1391 1392
{
  *length=buff->hostname_length;
1393
  return (uchar*) buff->host.hostname;
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1394 1395
}

1396

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1397
static void acl_update_user(const char *user, const char *host,
1398
			    const char *password, uint password_len,
1399 1400 1401 1402
			    enum SSL_type ssl_type,
			    const char *ssl_cipher,
			    const char *x509_issuer,
			    const char *x509_subject,
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1403
			    USER_RESOURCES  *mqh,
1404 1405 1406
			    ulong privileges,
			    const LEX_STRING *plugin,
			    const LEX_STRING *auth)
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1407
{
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1408
  mysql_mutex_assert_owner(&acl_cache->lock);
1409

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1410 1411 1412
  for (uint i=0 ; i < acl_users.elements ; i++)
  {
    ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
1413 1414
    if ((!acl_user->user && !user[0]) ||
	(acl_user->user && !strcmp(user,acl_user->user)))
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1415
    {
1416 1417 1418
      if ((!acl_user->host.hostname && !host[0]) ||
	  (acl_user->host.hostname &&
	  !my_strcasecmp(system_charset_info, host, acl_user->host.hostname)))
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1419
      {
1420 1421 1422 1423 1424 1425 1426 1427
        if (plugin->str[0])
        {
          acl_user->plugin.str= strmake_root(&mem, plugin->str, plugin->length);
          acl_user->plugin.length= plugin->length;
          acl_user->auth_string.str= auth->str ?
            strmake_root(&mem, auth->str, auth->length) : const_cast<char*>("");
          acl_user->auth_string.length= auth->length;
        }
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1428
	acl_user->access=privileges;
1429
	if (mqh->specified_limits & USER_RESOURCES::QUERIES_PER_HOUR)
1430
	  acl_user->user_resource.questions=mqh->questions;
1431
	if (mqh->specified_limits & USER_RESOURCES::UPDATES_PER_HOUR)
1432
	  acl_user->user_resource.updates=mqh->updates;
1433 1434 1435 1436
	if (mqh->specified_limits & USER_RESOURCES::CONNECTIONS_PER_HOUR)
	  acl_user->user_resource.conn_per_hour= mqh->conn_per_hour;
	if (mqh->specified_limits & USER_RESOURCES::USER_CONNECTIONS)
	  acl_user->user_resource.user_conn= mqh->user_conn;
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	if (ssl_type != SSL_TYPE_NOT_SPECIFIED)
	{
	  acl_user->ssl_type= ssl_type;
	  acl_user->ssl_cipher= (ssl_cipher ? strdup_root(&mem,ssl_cipher) :
				 0);
	  acl_user->x509_issuer= (x509_issuer ? strdup_root(&mem,x509_issuer) :
				  0);
	  acl_user->x509_subject= (x509_subject ?
				   strdup_root(&mem,x509_subject) : 0);
	}
1447 1448
	if (password)
	  set_user_salt(acl_user, password, password_len);
1449
        /* search complete: */
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1450 1451 1452 1453 1454 1455 1456 1457
	break;
      }
    }
  }
}


static void acl_insert_user(const char *user, const char *host,
1458
			    const char *password, uint password_len,
1459 1460 1461 1462
			    enum SSL_type ssl_type,
			    const char *ssl_cipher,
			    const char *x509_issuer,
			    const char *x509_subject,
1463
			    USER_RESOURCES *mqh,
1464 1465 1466
			    ulong privileges,
			    const LEX_STRING *plugin,
			    const LEX_STRING *auth)
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1467 1468
{
  ACL_USER acl_user;
1469

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1470
  mysql_mutex_assert_owner(&acl_cache->lock);
1471

1472
  acl_user.user=*user ? strdup_root(&mem,user) : 0;
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1473
  update_hostname(&acl_user.host, *host ? strdup_root(&mem, host): 0);
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
  if (plugin->str[0])
  {
    acl_user.plugin.str= strmake_root(&mem, plugin->str, plugin->length);
    acl_user.plugin.length= plugin->length;
    acl_user.auth_string.str= auth->str ?
      strmake_root(&mem, auth->str, auth->length) : const_cast<char*>("");
    acl_user.auth_string.length= auth->length;
  }
  else
  {
    acl_user.plugin= password_len == SCRAMBLED_PASSWORD_CHAR_LENGTH_323 ?
      old_password_plugin_name : native_password_plugin_name;
    acl_user.auth_string.str= strmake_root(&mem, password, password_len);
    acl_user.auth_string.length= password_len;
  }

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  acl_user.access=privileges;
1491
  acl_user.user_resource = *mqh;
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  acl_user.sort=get_sort(2,acl_user.host.hostname,acl_user.user);
1493
  acl_user.hostname_length=(uint) strlen(host);
1494 1495 1496 1497 1498
  acl_user.ssl_type= (ssl_type != SSL_TYPE_NOT_SPECIFIED ?
		      ssl_type : SSL_TYPE_NONE);
  acl_user.ssl_cipher=	ssl_cipher   ? strdup_root(&mem,ssl_cipher) : 0;
  acl_user.x509_issuer= x509_issuer  ? strdup_root(&mem,x509_issuer) : 0;
  acl_user.x509_subject=x509_subject ? strdup_root(&mem,x509_subject) : 0;
1499 1500

  set_user_salt(&acl_user, password, password_len);
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1501

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1502
  (void) push_dynamic(&acl_users,(uchar*) &acl_user);
1503 1504
  if (!acl_user.host.hostname ||
      (acl_user.host.hostname[0] == wild_many && !acl_user.host.hostname[1]))
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1505
    allow_all_hosts=1;		// Anyone can connect /* purecov: tested */
1506 1507
  my_qsort((uchar*) dynamic_element(&acl_users,0,ACL_USER*),acl_users.elements,
	   sizeof(ACL_USER),(qsort_cmp) acl_compare);
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1508

1509 1510
  /* Rebuild 'acl_check_hosts' since 'acl_users' has been modified */
  rebuild_check_host();
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1511 1512 1513 1514
}


static void acl_update_db(const char *user, const char *host, const char *db,
1515
			  ulong privileges)
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1516
{
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1517
  mysql_mutex_assert_owner(&acl_cache->lock);
1518

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1519 1520 1521
  for (uint i=0 ; i < acl_dbs.elements ; i++)
  {
    ACL_DB *acl_db=dynamic_element(&acl_dbs,i,ACL_DB*);
1522 1523 1524
    if ((!acl_db->user && !user[0]) ||
	(acl_db->user &&
	!strcmp(user,acl_db->user)))
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1525
    {
1526 1527 1528
      if ((!acl_db->host.hostname && !host[0]) ||
	  (acl_db->host.hostname &&
          !strcmp(host, acl_db->host.hostname)))
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1529
      {
1530 1531
	if ((!acl_db->db && !db[0]) ||
	    (acl_db->db && !strcmp(db,acl_db->db)))
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1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
	{
	  if (privileges)
	    acl_db->access=privileges;
	  else
	    delete_dynamic_element(&acl_dbs,i);
	}
      }
    }
  }
}


1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
/*
  Insert a user/db/host combination into the global acl_cache

  SYNOPSIS
    acl_insert_db()
    user		User name
    host		Host name
    db			Database name
    privileges		Bitmap of privileges

  NOTES
    acl_cache->lock must be locked when calling this
*/

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1558
static void acl_insert_db(const char *user, const char *host, const char *db,
1559
			  ulong privileges)
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1560 1561
{
  ACL_DB acl_db;
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1562
  mysql_mutex_assert_owner(&acl_cache->lock);
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  acl_db.user=strdup_root(&mem,user);
1564
  update_hostname(&acl_db.host, *host ? strdup_root(&mem,host) : 0);
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1565 1566 1567
  acl_db.db=strdup_root(&mem,db);
  acl_db.access=privileges;
  acl_db.sort=get_sort(3,acl_db.host.hostname,acl_db.db,acl_db.user);
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  (void) push_dynamic(&acl_dbs,(uchar*) &acl_db);
1569 1570
  my_qsort((uchar*) dynamic_element(&acl_dbs,0,ACL_DB*),acl_dbs.elements,
	   sizeof(ACL_DB),(qsort_cmp) acl_compare);
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1571 1572 1573
}


1574 1575 1576

/*
  Get privilege for a host, user and db combination
1577 1578 1579

  as db_is_pattern changes the semantics of comparison,
  acl_cache is not used if db_is_pattern is set.
1580
*/
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1581

1582
ulong acl_get(const char *host, const char *ip,
1583
              const char *user, const char *db, my_bool db_is_pattern)
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1584
{
1585
  ulong host_access= ~(ulong)0, db_access= 0;
1586 1587
  uint i;
  size_t key_length;
1588
  char key[ACL_KEY_LENGTH],*tmp_db,*end;
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  acl_entry *entry;
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1590
  DBUG_ENTER("acl_get");
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1591

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1592
  mysql_mutex_lock(&acl_cache->lock);
1593
  end=strmov((tmp_db=strmov(strmov(key, ip ? ip : "")+1,user)+1),db);
1594 1595
  if (lower_case_table_names)
  {
1596
    my_casedn_str(files_charset_info, tmp_db);
1597 1598
    db=tmp_db;
  }
1599 1600 1601
  key_length= (size_t) (end-key);
  if (!db_is_pattern && (entry=(acl_entry*) acl_cache->search((uchar*) key,
                                                              key_length)))
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1602 1603
  {
    db_access=entry->access;
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1604
    mysql_mutex_unlock(&acl_cache->lock);
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1605 1606
    DBUG_PRINT("exit", ("access: 0x%lx", db_access));
    DBUG_RETURN(db_access);
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  }

  /*
    Check if there are some access rights for database and user
  */
  for (i=0 ; i < acl_dbs.elements ; i++)
  {
    ACL_DB *acl_db=dynamic_element(&acl_dbs,i,ACL_DB*);
    if (!acl_db->user || !strcmp(user,acl_db->user))
    {
      if (compare_hostname(&acl_db->host,host,ip))
      {
1619
	if (!acl_db->db || !wild_compare(db,acl_db->db,db_is_pattern))
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1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	{
	  db_access=acl_db->access;
	  if (acl_db->host.hostname)
	    goto exit;				// Fully specified. Take it
	  break; /* purecov: tested */
	}
      }
    }
  }
  if (!db_access)
    goto exit;					// Can't be better

  /*
    No host specified for user. Get hostdata from host table
  */
  host_access=0;				// Host must be found
  for (i=0 ; i < acl_hosts.elements ; i++)
  {
    ACL_HOST *acl_host=dynamic_element(&acl_hosts,i,ACL_HOST*);
    if (compare_hostname(&acl_host->host,host,ip))
    {
1641
      if (!acl_host->db || !wild_compare(db,acl_host->db,db_is_pattern))
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1642 1643 1644 1645 1646 1647 1648 1649
      {
	host_access=acl_host->access;		// Fully specified. Take it
	break;
      }
    }
  }
exit:
  /* Save entry in cache for quick retrieval */
1650 1651
  if (!db_is_pattern &&
      (entry= (acl_entry*) malloc(sizeof(acl_entry)+key_length)))
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1652 1653 1654
  {
    entry->access=(db_access & host_access);
    entry->length=key_length;
1655
    memcpy((uchar*) entry->key,key,key_length);
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1656 1657
    acl_cache->add(entry);
  }
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1658
  mysql_mutex_unlock(&acl_cache->lock);
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1659 1660
  DBUG_PRINT("exit", ("access: 0x%lx", db_access & host_access));
  DBUG_RETURN(db_access & host_access);
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1661 1662
}

1663 1664 1665 1666 1667 1668 1669
/*
  Check if there are any possible matching entries for this host

  NOTES
    All host names without wild cards are stored in a hash table,
    entries with wildcards are stored in a dynamic array
*/
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1670 1671 1672 1673

static void init_check_host(void)
{
  DBUG_ENTER("init_check_host");
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1674 1675 1676 1677 1678
  (void) my_init_dynamic_array(&acl_wild_hosts,sizeof(struct acl_host_and_ip),
			  acl_users.elements,1);
  (void) my_hash_init(&acl_check_hosts,system_charset_info,
                      acl_users.elements, 0, 0,
                      (my_hash_get_key) check_get_key, 0, 0);
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  if (!allow_all_hosts)
  {
    for (uint i=0 ; i < acl_users.elements ; i++)
    {
      ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
      if (strchr(acl_user->host.hostname,wild_many) ||
	  strchr(acl_user->host.hostname,wild_one) ||
	  acl_user->host.ip_mask)
      {						// Has wildcard
	uint j;
	for (j=0 ; j < acl_wild_hosts.elements ; j++)
	{					// Check if host already exists
	  acl_host_and_ip *acl=dynamic_element(&acl_wild_hosts,j,
					       acl_host_and_ip *);
1693
	  if (!my_strcasecmp(system_charset_info,
1694
                             acl_user->host.hostname, acl->hostname))
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1695 1696 1697
	    break;				// already stored
	}
	if (j == acl_wild_hosts.elements)	// If new
1698
	  (void) push_dynamic(&acl_wild_hosts,(uchar*) &acl_user->host);
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1699
      }
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1700 1701 1702
      else if (!my_hash_search(&acl_check_hosts,(uchar*)
                               acl_user->host.hostname,
                               strlen(acl_user->host.hostname)))
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1703
      {
1704
	if (my_hash_insert(&acl_check_hosts,(uchar*) acl_user))
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	{					// End of memory
	  allow_all_hosts=1;			// Should never happen
	  DBUG_VOID_RETURN;
	}
      }
    }
  }
  freeze_size(&acl_wild_hosts);
  freeze_size(&acl_check_hosts.array);
  DBUG_VOID_RETURN;
}


1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
/*
  Rebuild lists used for checking of allowed hosts

  We need to rebuild 'acl_check_hosts' and 'acl_wild_hosts' after adding,
  dropping or renaming user, since they contain pointers to elements of
  'acl_user' array, which are invalidated by drop operation, and use
  ACL_USER::host::hostname as a key, which is changed by rename.
*/
void rebuild_check_host(void)
{
  delete_dynamic(&acl_wild_hosts);
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1729
  my_hash_free(&acl_check_hosts);
1730 1731 1732 1733
  init_check_host();
}


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/* Return true if there is no users that can match the given host */

bool acl_check_host(const char *host, const char *ip)
{
  if (allow_all_hosts)
    return 0;
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1740
  mysql_mutex_lock(&acl_cache->lock);
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1741

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1742 1743
  if ((host && my_hash_search(&acl_check_hosts,(uchar*) host,strlen(host))) ||
      (ip && my_hash_search(&acl_check_hosts,(uchar*) ip, strlen(ip))))
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1744
  {
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1745
    mysql_mutex_unlock(&acl_cache->lock);
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1746 1747 1748 1749 1750 1751 1752
    return 0;					// Found host
  }
  for (uint i=0 ; i < acl_wild_hosts.elements ; i++)
  {
    acl_host_and_ip *acl=dynamic_element(&acl_wild_hosts,i,acl_host_and_ip*);
    if (compare_hostname(acl, host, ip))
    {
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1753
      mysql_mutex_unlock(&acl_cache->lock);
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1754 1755 1756
      return 0;					// Host ok
    }
  }
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1757
  mysql_mutex_unlock(&acl_cache->lock);
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1758 1759 1760 1761
  return 1;					// Host is not allowed
}


1762 1763 1764 1765 1766 1767 1768 1769
/*
  Check if the user is allowed to change password

  SYNOPSIS:
    check_change_password()
    thd		THD
    host	hostname for the user
    user	user name
1770 1771 1772 1773
    new_password new password

  NOTE:
    new_password cannot be NULL
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merge  
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1774

1775
    RETURN VALUE
1776 1777
      0		OK
      1		ERROR  ; In this case the error is sent to the client.
1778 1779
*/

1780
int check_change_password(THD *thd, const char *host, const char *user,
1781
                           char *new_password, uint new_password_len)
1782
{
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1783 1784
  if (!initialized)
  {
1785
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
1786
    return(1);
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1787
  }
1788
  if (!thd->slave_thread &&
1789 1790 1791
      (strcmp(thd->security_ctx->user, user) ||
       my_strcasecmp(system_charset_info, host,
                     thd->security_ctx->priv_host)))
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1792
  {
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1793
    if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 0))
1794
      return(1);
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1795
  }
1796
  if (!thd->slave_thread && !thd->security_ctx->user[0])
1797
  {
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1798 1799
    my_message(ER_PASSWORD_ANONYMOUS_USER, ER(ER_PASSWORD_ANONYMOUS_USER),
               MYF(0));
1800
    return(1);
1801
  }
1802
  size_t len= strlen(new_password);
1803
  if (len && len != SCRAMBLED_PASSWORD_CHAR_LENGTH &&
1804 1805
      len != SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
  {
1806
    my_error(ER_PASSWD_LENGTH, MYF(0), SCRAMBLED_PASSWORD_CHAR_LENGTH);
1807 1808
    return -1;
  }
1809 1810 1811 1812
  return(0);
}


1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
/*
  Change a password for a user

  SYNOPSIS
    change_password()
    thd			Thread handle
    host		Hostname
    user		User name
    new_password	New password for host@user

  RETURN VALUES
    0	ok
    1	ERROR; In this case the error is sent to the client.
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1826
*/
1827

1828 1829 1830
bool change_password(THD *thd, const char *host, const char *user,
		     char *new_password)
{
1831 1832 1833 1834 1835
  TABLE_LIST tables;
  TABLE *table;
  /* Buffer should be extended when password length is extended. */
  char buff[512];
  ulong query_length;
1836
  bool save_binlog_row_based;
1837
  uint new_password_len= (uint) strlen(new_password);
1838
  bool result= 1;
1839 1840 1841 1842 1843
  DBUG_ENTER("change_password");
  DBUG_PRINT("enter",("host: '%s'  user: '%s'  new_password: '%s'",
		      host,user,new_password));
  DBUG_ASSERT(host != 0);			// Ensured by parent

1844
  if (check_change_password(thd, host, user, new_password, new_password_len))
1845 1846
    DBUG_RETURN(1);

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1847
  tables.init_one_table("mysql", 5, "user", 4, "user", TL_WRITE);
1848 1849 1850 1851 1852 1853

#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
1854
  if (thd->slave_thread && rpl_filter->is_on())
1855 1856 1857 1858 1859 1860 1861
  {
    /*
      The tables must be marked "updating" so that tables_ok() takes them into
      account in tests.  It's ok to leave 'updating' set after tables_ok.
    */
    tables.updating= 1;
    /* Thanks to bzero, tables.next==0 */
1862
    if (!(thd->spcont || rpl_filter->tables_ok(0, &tables)))
1863 1864 1865
      DBUG_RETURN(0);
  }
#endif
1866
  if (!(table= open_ltable(thd, &tables, TL_WRITE, MYSQL_LOCK_IGNORE_TIMEOUT)))
1867 1868
    DBUG_RETURN(1);

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  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();

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1877
  mysql_mutex_lock(&acl_cache->lock);
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1878
  ACL_USER *acl_user;
1879
  if (!(acl_user= find_acl_user(host, user, TRUE)))
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1880
  {
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1881
    mysql_mutex_unlock(&acl_cache->lock);
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1882
    my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH), MYF(0));
1883
    goto end;
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1884
  }
1885 1886 1887 1888 1889 1890

  if (my_strcasecmp(system_charset_info, acl_user->plugin.str,
                    native_password_plugin_name.str) &&
      my_strcasecmp(system_charset_info, acl_user->plugin.str,
                    old_password_plugin_name.str))
  {
1891 1892
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                 ER_SET_PASSWORD_AUTH_PLUGIN, ER(ER_SET_PASSWORD_AUTH_PLUGIN));
1893
  }
1894 1895
  /* update loaded acl entry: */
  set_user_salt(acl_user, new_password, new_password_len);
1896
  set_user_plugin(acl_user, new_password_len);
1897

1898
  if (update_user_table(thd, table,
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1899
			acl_user->host.hostname ? acl_user->host.hostname : "",
1900
			acl_user->user ? acl_user->user : "",
1901
			new_password, new_password_len))
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1902
  {
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1903
    mysql_mutex_unlock(&acl_cache->lock); /* purecov: deadcode */
1904
    goto end;
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1905
  }
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1906

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1907
  acl_cache->clear(1);				// Clear locked hostname cache
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1908
  mysql_mutex_unlock(&acl_cache->lock);
1909 1910 1911
  result= 0;
  if (mysql_bin_log.is_open())
  {
1912 1913 1914 1915
    query_length= sprintf(buff, "SET PASSWORD FOR '%-.120s'@'%-.120s'='%-.120s'",
                          acl_user->user ? acl_user->user : "",
                          acl_user->host.hostname ? acl_user->host.hostname : "",
                          new_password);
1916
    thd->clear_error();
1917 1918
    result= thd->binlog_query(THD::STMT_QUERY_TYPE, buff, query_length,
                              FALSE, FALSE, FALSE, 0);
1919 1920
  }
end:
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  close_mysql_tables(thd);

  /* Restore the state of binlog format */
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();

1928
  DBUG_RETURN(result);
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1929 1930 1931
}


1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
/*
  Find user in ACL

  SYNOPSIS
    is_acl_user()
    host                 host name
    user                 user name

  RETURN
   FALSE  user not fond
   TRUE   there are such user
*/

bool is_acl_user(const char *host, const char *user)
{
  bool res;
1948 1949 1950 1951 1952

  /* --skip-grants */
  if (!initialized)
    return TRUE;

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1953
  mysql_mutex_lock(&acl_cache->lock);
1954
  res= find_acl_user(host, user, TRUE) != NULL;
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1955
  mysql_mutex_unlock(&acl_cache->lock);
1956 1957 1958 1959
  return res;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
1960 1961 1962 1963 1964
/*
  Find first entry that matches the current user
*/

static ACL_USER *
1965
find_acl_user(const char *host, const char *user, my_bool exact)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1966
{
1967
  DBUG_ENTER("find_acl_user");
1968
  DBUG_PRINT("enter",("host: '%s'  user: '%s'",host,user));
1969

Marc Alff's avatar
Marc Alff committed
1970
  mysql_mutex_assert_owner(&acl_cache->lock);
1971

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bk@work.mysql.com committed
1972 1973 1974
  for (uint i=0 ; i < acl_users.elements ; i++)
  {
    ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
1975
    DBUG_PRINT("info",("strcmp('%s','%s'), compare_hostname('%s','%s'),",
1976 1977 1978 1979
                       user, acl_user->user ? acl_user->user : "",
                       host,
                       acl_user->host.hostname ? acl_user->host.hostname :
                       ""));
1980 1981
    if ((!acl_user->user && !user[0]) ||
	(acl_user->user && !strcmp(user,acl_user->user)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1982
    {
1983
      if (exact ? !my_strcasecmp(system_charset_info, host,
1984 1985
                                 acl_user->host.hostname ?
				 acl_user->host.hostname : "") :
1986
          compare_hostname(&acl_user->host,host,host))
1987 1988 1989
      {
	DBUG_RETURN(acl_user);
      }
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bk@work.mysql.com committed
1990 1991
    }
  }
1992
  DBUG_RETURN(0);
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1993 1994 1995
}


1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
/*
  Comparing of hostnames

  NOTES
  A hostname may be of type:
  hostname   (May include wildcards);   monty.pp.sci.fi
  ip	   (May include wildcards);   192.168.0.0
  ip/netmask			      192.168.0.0/255.255.255.0

  A net mask of 0.0.0.0 is not allowed.
*/
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2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028

static const char *calc_ip(const char *ip, long *val, char end)
{
  long ip_val,tmp;
  if (!(ip=str2int(ip,10,0,255,&ip_val)) || *ip != '.')
    return 0;
  ip_val<<=24;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != '.')
    return 0;
  ip_val+=tmp<<16;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != '.')
    return 0;
  ip_val+=tmp<<8;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != end)
    return 0;
  *val=ip_val+tmp;
  return ip;
}


static void update_hostname(acl_host_and_ip *host, const char *hostname)
{
2029
  host->hostname=(char*) hostname;             // This will not be modified!
2030
  if (!hostname ||
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bk@work.mysql.com committed
2031 2032 2033
      (!(hostname=calc_ip(hostname,&host->ip,'/')) ||
       !(hostname=calc_ip(hostname+1,&host->ip_mask,'\0'))))
  {
2034
    host->ip= host->ip_mask=0;			// Not a masked ip
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2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047
  }
}


static bool compare_hostname(const acl_host_and_ip *host, const char *hostname,
			     const char *ip)
{
  long tmp;
  if (host->ip_mask && ip && calc_ip(ip,&tmp,'\0'))
  {
    return (tmp & host->ip_mask) == host->ip;
  }
  return (!host->hostname ||
2048
	  (hostname && !wild_case_compare(system_charset_info,
2049 2050
                                          hostname, host->hostname)) ||
	  (ip && !wild_compare(ip, host->hostname, 0)));
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2051 2052
}

2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078
/**
  Check if the given host name needs to be resolved or not.
  Host name has to be resolved if it actually contains *name*.

  For example:
    192.168.1.1               --> FALSE
    192.168.1.0/255.255.255.0 --> FALSE
    %                         --> FALSE
    192.168.1.%               --> FALSE
    AB%                       --> FALSE

    AAAAFFFF                  --> TRUE (Hostname)
    AAAA:FFFF:1234:5678       --> FALSE
    ::1                       --> FALSE

  This function does not check if the given string is a valid host name or
  not. It assumes that the argument is a valid host name.

  @param hostname   the string to check.

  @return a flag telling if the argument needs to be resolved or not.
  @retval TRUE the argument is a host name and needs to be resolved.
  @retval FALSE the argument is either an IP address, or a patter and
          should not be resolved.
*/

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2079 2080 2081
bool hostname_requires_resolving(const char *hostname)
{
  if (!hostname)
monty@mysql.com's avatar
monty@mysql.com committed
2082
    return FALSE;
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094

  /* Check if hostname is the localhost. */

  size_t hostname_len= strlen(hostname);
  size_t localhost_len= strlen(my_localhost);

  if (hostname == my_localhost ||
      (hostname_len == localhost_len &&
       !my_strnncoll(system_charset_info,
                     (const uchar *) hostname,  hostname_len,
                     (const uchar *) my_localhost, strlen(my_localhost))))
  {
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monty@mysql.com committed
2095
    return FALSE;
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
  }

  /*
    If the string contains any of {':', '%', '_', '/'}, it is definitely
    not a host name:
      - ':' means that the string is an IPv6 address;
      - '%' or '_' means that the string is a pattern;
      - '/' means that the string is an IPv4 network address;
  */

  for (const char *p= hostname; *p; ++p)
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2107
  {
2108 2109 2110 2111 2112 2113 2114
    switch (*p) {
      case ':':
      case '%':
      case '_':
      case '/':
        return FALSE;
    }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2115
  }
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129

  /*
    Now we have to tell a host name (ab.cd, 12.ab) from an IPv4 address
    (12.34.56.78). The assumption is that if the string contains only
    digits and dots, it is an IPv4 address. Otherwise -- a host name.
  */

  for (const char *p= hostname; *p; ++p)
  {
    if (*p != '.' && !my_isdigit(&my_charset_latin1, *p))
      return TRUE; /* a "letter" has been found. */
  }

  return FALSE; /* all characters are either dots or digits. */
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2130
}
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2131

2132

2133
/*
2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
  Update record for user in mysql.user privilege table with new password.

  SYNOPSIS
    update_user_table()
      thd               Thread handle
      table             Pointer to TABLE object for open mysql.user table
      host/user         Hostname/username pair identifying user for which
                        new password should be set
      new_password      New password
      new_password_len  Length of new password
2144
*/
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bk@work.mysql.com committed
2145

2146 2147
static bool update_user_table(THD *thd, TABLE *table,
                              const char *host, const char *user,
2148
			      const char *new_password, uint new_password_len)
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bk@work.mysql.com committed
2149
{
2150
  char user_key[MAX_KEY_LENGTH];
2151
  int error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2152 2153 2154
  DBUG_ENTER("update_user_table");
  DBUG_PRINT("enter",("user: %s  host: %s",user,host));

2155
  table->use_all_columns();
2156 2157
  table->field[0]->store(host,(uint) strlen(host), system_charset_info);
  table->field[1]->store(user,(uint) strlen(user), system_charset_info);
2158
  key_copy((uchar *) user_key, table->record[0], table->key_info,
2159
           table->key_info->key_length);
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2160

2161 2162 2163
  if (table->file->index_read_idx_map(table->record[0], 0,
                                      (uchar *) user_key, HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
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bk@work.mysql.com committed
2164
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2165 2166
    my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH),
               MYF(0));	/* purecov: deadcode */
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bk@work.mysql.com committed
2167 2168
    DBUG_RETURN(1);				/* purecov: deadcode */
  }
2169
  store_record(table,record[1]);
2170
  table->field[2]->store(new_password, new_password_len, system_charset_info);
2171 2172
  if ((error=table->file->ha_update_row(table->record[1],table->record[0])) &&
      error != HA_ERR_RECORD_IS_THE_SAME)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2173 2174
  {
    table->file->print_error(error,MYF(0));	/* purecov: deadcode */
2175
    DBUG_RETURN(1);
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bk@work.mysql.com committed
2176
  }
2177
  DBUG_RETURN(0);
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bk@work.mysql.com committed
2178 2179
}

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2180

2181 2182 2183 2184 2185 2186
/*
  Return 1 if we are allowed to create new users
  the logic here is: INSERT_ACL is sufficient.
  It's also a requirement in opt_safe_user_create,
  otherwise CREATE_USER_ACL is enough.
*/
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2187 2188 2189

static bool test_if_create_new_users(THD *thd)
{
2190
  Security_context *sctx= thd->security_ctx;
2191
  bool create_new_users= test(sctx->master_access & INSERT_ACL) ||
2192
                         (!opt_safe_user_create &&
2193
                          test(sctx->master_access & CREATE_USER_ACL));
2194
  if (!create_new_users)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2195 2196
  {
    TABLE_LIST tl;
2197
    ulong db_access;
2198 2199
    tl.init_one_table(C_STRING_WITH_LEN("mysql"),
                      C_STRING_WITH_LEN("user"), "user", TL_WRITE);
2200
    create_new_users= 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2201

2202 2203
    db_access=acl_get(sctx->host, sctx->ip,
		      sctx->priv_user, tl.db, 0);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2204 2205
    if (!(db_access & INSERT_ACL))
    {
2206
      if (check_grant(thd, INSERT_ACL, &tl, FALSE, UINT_MAX, TRUE))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2207 2208 2209 2210 2211 2212 2213
	create_new_users=0;
    }
  }
  return create_new_users;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
2214
/****************************************************************************
2215
  Handle GRANT commands
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bk@work.mysql.com committed
2216 2217
****************************************************************************/

2218
static int replace_user_table(THD *thd, TABLE *table, const LEX_USER &combo,
2219
			      ulong rights, bool revoke_grant,
serg@serg.mylan's avatar
serg@serg.mylan committed
2220
			      bool can_create_user, bool no_auto_create)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2221 2222
{
  int error = -1;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2223
  bool old_row_exists=0;
2224
  const char *password= "";
2225
  uint password_len= 0;
2226
  char what= (revoke_grant) ? 'N' : 'Y';
2227
  uchar user_key[MAX_KEY_LENGTH];
2228
  LEX *lex= thd->lex;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2229
  DBUG_ENTER("replace_user_table");
2230

Marc Alff's avatar
Marc Alff committed
2231
  mysql_mutex_assert_owner(&acl_cache->lock);
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bk@work.mysql.com committed
2232 2233

  if (combo.password.str && combo.password.str[0])
2234
  {
2235 2236
    if (combo.password.length != SCRAMBLED_PASSWORD_CHAR_LENGTH &&
        combo.password.length != SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
2237
    {
2238
      my_error(ER_PASSWD_LENGTH, MYF(0), SCRAMBLED_PASSWORD_CHAR_LENGTH);
2239
      DBUG_RETURN(-1);
2240
    }
2241
    password_len= combo.password.length;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2242
    password=combo.password.str;
2243
  }
peter@mysql.com's avatar
peter@mysql.com committed
2244

2245 2246 2247 2248 2249
  table->use_all_columns();
  table->field[0]->store(combo.host.str,combo.host.length,
                         system_charset_info);
  table->field[1]->store(combo.user.str,combo.user.length,
                         system_charset_info);
2250 2251 2252
  key_copy(user_key, table->record[0], table->key_info,
           table->key_info->key_length);

2253 2254 2255
  if (table->file->index_read_idx_map(table->record[0], 0, user_key,
                                      HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
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bk@work.mysql.com committed
2256
  {
2257 2258
    /* what == 'N' means revoke */
    if (what == 'N')
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bk@work.mysql.com committed
2259
    {
2260 2261 2262 2263
      my_error(ER_NONEXISTING_GRANT, MYF(0), combo.user.str, combo.host.str);
      goto end;
    }
    /*
2264 2265
      There are four options which affect the process of creation of
      a new user (mysqld option --safe-create-user, 'insert' privilege
2266 2267 2268 2269 2270 2271 2272
      on 'mysql.user' table, using 'GRANT' with 'IDENTIFIED BY' and
      SQL_MODE flag NO_AUTO_CREATE_USER). Below is the simplified rule
      how it should work.
      if (safe-user-create && ! INSERT_priv) => reject
      else if (identified_by) => create
      else if (no_auto_create_user) => reject
      else create
2273 2274

      see also test_if_create_new_users()
2275
    */
2276
    else if (!password_len && !combo.plugin.length && no_auto_create)
serg@serg.mylan's avatar
serg@serg.mylan committed
2277 2278 2279 2280 2281
    {
      my_error(ER_PASSWORD_NO_MATCH, MYF(0), combo.user.str, combo.host.str);
      goto end;
    }
    else if (!can_create_user)
2282
    {
2283
      my_error(ER_CANT_CREATE_USER_WITH_GRANT, MYF(0),
2284
               thd->security_ctx->user, thd->security_ctx->host_or_ip);
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bk@work.mysql.com committed
2285 2286
      goto end;
    }
2287 2288 2289 2290 2291 2292 2293 2294 2295
    else if (combo.plugin.str[0])
    {
      if (!plugin_is_ready(&combo.plugin, MYSQL_AUTHENTICATION_PLUGIN))
      {
        my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), combo.plugin.str);
        goto end;
      }
    }

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2296
    old_row_exists = 0;
2297
    restore_record(table,s->default_values);
2298
    table->field[0]->store(combo.host.str,combo.host.length,
2299
                           system_charset_info);
2300
    table->field[1]->store(combo.user.str,combo.user.length,
2301
                           system_charset_info);
2302
    table->field[2]->store(password, password_len,
2303
                           system_charset_info);
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bk@work.mysql.com committed
2304 2305 2306
  }
  else
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2307
    old_row_exists = 1;
2308
    store_record(table,record[1]);			// Save copy for update
2309 2310 2311 2312 2313 2314 2315 2316
    /* what == 'N' means revoke */
    if (combo.plugin.length && what != 'N')
    {
        my_error(ER_GRANT_PLUGIN_USER_EXISTS, MYF(0), combo.user.length, 
                 combo.user.str);
        goto end;
    }
    if (combo.password.str)                             // If password given
2317
      table->field[2]->store(password, password_len, system_charset_info);
2318
    else if (!rights && !revoke_grant &&
2319 2320
             lex->ssl_type == SSL_TYPE_NOT_SPECIFIED &&
             !lex->mqh.specified_limits)
2321 2322 2323
    {
      DBUG_RETURN(0);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2324 2325
  }

2326 2327 2328 2329
  /* Update table columns with new privileges */

  Field **tmp_field;
  ulong priv;
2330
  uint next_field;
2331
  for (tmp_field= table->field+3, priv = SELECT_ACL;
2332
       *tmp_field && (*tmp_field)->real_type() == MYSQL_TYPE_ENUM &&
2333 2334
	 ((Field_enum*) (*tmp_field))->typelib->count == 2 ;
       tmp_field++, priv <<= 1)
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bk@work.mysql.com committed
2335
  {
2336
    if (priv & rights)				 // set requested privileges
2337
      (*tmp_field)->store(&what, 1, &my_charset_latin1);
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bk@work.mysql.com committed
2338
  }
2339
  rights= get_access(table, 3, &next_field);
2340 2341
  DBUG_PRINT("info",("table fields: %d",table->s->fields));
  if (table->s->fields >= 31)		/* From 4.0.0 we have more fields */
2342
  {
2343
    /* We write down SSL related ACL stuff */
2344
    switch (lex->ssl_type) {
2345
    case SSL_TYPE_ANY:
2346 2347
      table->field[next_field]->store(STRING_WITH_LEN("ANY"),
                                      &my_charset_latin1);
2348 2349 2350
      table->field[next_field+1]->store("", 0, &my_charset_latin1);
      table->field[next_field+2]->store("", 0, &my_charset_latin1);
      table->field[next_field+3]->store("", 0, &my_charset_latin1);
2351 2352
      break;
    case SSL_TYPE_X509:
2353 2354
      table->field[next_field]->store(STRING_WITH_LEN("X509"),
                                      &my_charset_latin1);
2355 2356 2357
      table->field[next_field+1]->store("", 0, &my_charset_latin1);
      table->field[next_field+2]->store("", 0, &my_charset_latin1);
      table->field[next_field+3]->store("", 0, &my_charset_latin1);
2358 2359
      break;
    case SSL_TYPE_SPECIFIED:
2360 2361
      table->field[next_field]->store(STRING_WITH_LEN("SPECIFIED"),
                                      &my_charset_latin1);
2362 2363 2364
      table->field[next_field+1]->store("", 0, &my_charset_latin1);
      table->field[next_field+2]->store("", 0, &my_charset_latin1);
      table->field[next_field+3]->store("", 0, &my_charset_latin1);
2365
      if (lex->ssl_cipher)
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serg@sergbook.mysql.com committed
2366 2367
        table->field[next_field+1]->store(lex->ssl_cipher,
                                strlen(lex->ssl_cipher), system_charset_info);
2368
      if (lex->x509_issuer)
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serg@sergbook.mysql.com committed
2369 2370
        table->field[next_field+2]->store(lex->x509_issuer,
                                strlen(lex->x509_issuer), system_charset_info);
2371
      if (lex->x509_subject)
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serg@sergbook.mysql.com committed
2372 2373
        table->field[next_field+3]->store(lex->x509_subject,
                                strlen(lex->x509_subject), system_charset_info);
2374
      break;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2375
    case SSL_TYPE_NOT_SPECIFIED:
gluh@gluh.(none)'s avatar
gluh@gluh.(none) committed
2376 2377
      break;
    case SSL_TYPE_NONE:
2378 2379 2380 2381
      table->field[next_field]->store("", 0, &my_charset_latin1);
      table->field[next_field+1]->store("", 0, &my_charset_latin1);
      table->field[next_field+2]->store("", 0, &my_charset_latin1);
      table->field[next_field+3]->store("", 0, &my_charset_latin1);
gluh@gluh.(none)'s avatar
gluh@gluh.(none) committed
2382
      break;
2383
    }
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
2384
    next_field+=4;
2385

2386
    USER_RESOURCES mqh= lex->mqh;
2387
    if (mqh.specified_limits & USER_RESOURCES::QUERIES_PER_HOUR)
2388
      table->field[next_field]->store((longlong) mqh.questions, TRUE);
2389
    if (mqh.specified_limits & USER_RESOURCES::UPDATES_PER_HOUR)
2390
      table->field[next_field+1]->store((longlong) mqh.updates, TRUE);
2391
    if (mqh.specified_limits & USER_RESOURCES::CONNECTIONS_PER_HOUR)
2392
      table->field[next_field+2]->store((longlong) mqh.conn_per_hour, TRUE);
2393
    if (table->s->fields >= 36 &&
2394
        (mqh.specified_limits & USER_RESOURCES::USER_CONNECTIONS))
2395
      table->field[next_field+3]->store((longlong) mqh.user_conn, TRUE);
2396
    mqh_used= mqh_used || mqh.questions || mqh.updates || mqh.conn_per_hour;
2397

2398
    next_field+= 4;
2399 2400 2401 2402 2403 2404
    if (combo.plugin.str[0])
    {
      if (table->s->fields >= 41 && combo.plugin.str[0])
      {
        table->field[next_field]->store(combo.plugin.str, combo.plugin.length,
                                        system_charset_info);
2405
        table->field[next_field]->set_notnull();
2406 2407
        table->field[next_field + 1]->store(combo.auth.str, combo.auth.length,
                                            system_charset_info);
2408
        table->field[next_field + 1]->set_notnull();
2409 2410 2411
      }
      else
      {
2412
        my_error(ER_BAD_FIELD_ERROR, MYF(0), "plugin", "mysql.user");
2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423
        goto end;
      }
    }
  }

  if (old_row_exists)
  {
    /*
      We should NEVER delete from the user table, as a uses can still
      use mysqld even if he doesn't have any privileges in the user table!
    */
2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
    if (cmp_record(table,record[1]))
    {
      if ((error=
           table->file->ha_update_row(table->record[1],table->record[0])) &&
          error != HA_ERR_RECORD_IS_THE_SAME)
      {						// This should never happen
        table->file->print_error(error,MYF(0));	/* purecov: deadcode */
        error= -1;				/* purecov: deadcode */
        goto end;				/* purecov: deadcode */
      }
      else
        error= 0;
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2436 2437
    }
  }
2438
  else if ((error=table->file->ha_write_row(table->record[0]))) // insert
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2439
  {						// This should never happen
2440
    if (table->file->is_fatal_error(error, HA_CHECK_DUP))
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2441 2442 2443 2444 2445 2446 2447 2448
    {
      table->file->print_error(error,MYF(0));	/* purecov: deadcode */
      error= -1;				/* purecov: deadcode */
      goto end;					/* purecov: deadcode */
    }
  }
  error=0;					// Privileges granted / revoked

2449
end:
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2450 2451 2452
  if (!error)
  {
    acl_cache->clear(1);			// Clear privilege cache
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monty@hundin.mysql.fi committed
2453
    if (old_row_exists)
2454 2455
      acl_update_user(combo.user.str, combo.host.str,
                      combo.password.str, password_len,
2456 2457 2458 2459 2460
		      lex->ssl_type,
		      lex->ssl_cipher,
		      lex->x509_issuer,
		      lex->x509_subject,
		      &lex->mqh,
2461 2462 2463
		      rights,
		      &combo.plugin,
		      &combo.auth);
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2464
    else
2465
      acl_insert_user(combo.user.str, combo.host.str, password, password_len,
2466 2467 2468 2469 2470
		      lex->ssl_type,
		      lex->ssl_cipher,
		      lex->x509_issuer,
		      lex->x509_subject,
		      &lex->mqh,
2471 2472 2473
		      rights,
		      &combo.plugin,
		      &combo.auth);
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2474 2475 2476 2477 2478 2479
  }
  DBUG_RETURN(error);
}


/*
2480
  change grants in the mysql.db table
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2481 2482 2483 2484
*/

static int replace_db_table(TABLE *table, const char *db,
			    const LEX_USER &combo,
2485
			    ulong rights, bool revoke_grant)
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2486
{
2487 2488
  uint i;
  ulong priv,store_rights;
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2489
  bool old_row_exists=0;
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2490
  int error;
2491
  char what= (revoke_grant) ? 'N' : 'Y';
2492
  uchar user_key[MAX_KEY_LENGTH];
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2493 2494
  DBUG_ENTER("replace_db_table");

2495 2496
  if (!initialized)
  {
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2497
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
2498 2499 2500
    DBUG_RETURN(-1);
  }

2501
  /* Check if there is such a user in user table in memory? */
2502
  if (!find_acl_user(combo.host.str,combo.user.str, FALSE))
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2503
  {
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bell@sanja.is.com.ua committed
2504
    my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH), MYF(0));
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2505 2506 2507
    DBUG_RETURN(-1);
  }

2508 2509 2510
  table->use_all_columns();
  table->field[0]->store(combo.host.str,combo.host.length,
                         system_charset_info);
2511
  table->field[1]->store(db,(uint) strlen(db), system_charset_info);
2512 2513
  table->field[2]->store(combo.user.str,combo.user.length,
                         system_charset_info);
2514 2515 2516
  key_copy(user_key, table->record[0], table->key_info,
           table->key_info->key_length);

2517 2518 2519
  if (table->file->index_read_idx_map(table->record[0],0, user_key,
                                      HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
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2520 2521 2522
  {
    if (what == 'N')
    { // no row, no revoke
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guilhem@mysql.com committed
2523
      my_error(ER_NONEXISTING_GRANT, MYF(0), combo.user.str, combo.host.str);
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2524 2525
      goto abort;
    }
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monty@hundin.mysql.fi committed
2526
    old_row_exists = 0;
2527
    restore_record(table, s->default_values);
2528 2529
    table->field[0]->store(combo.host.str,combo.host.length,
                           system_charset_info);
2530
    table->field[1]->store(db,(uint) strlen(db), system_charset_info);
2531 2532
    table->field[2]->store(combo.user.str,combo.user.length,
                           system_charset_info);
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2533 2534 2535
  }
  else
  {
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2536
    old_row_exists = 1;
2537
    store_record(table,record[1]);
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2538 2539 2540
  }

  store_rights=get_rights_for_db(rights);
2541
  for (i= 3, priv= 1; i < table->s->fields; i++, priv <<= 1)
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bk@work.mysql.com committed
2542
  {
2543
    if (priv & store_rights)			// do it if priv is chosen
2544
      table->field [i]->store(&what,1, &my_charset_latin1);// set requested privileges
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2545 2546 2547 2548
  }
  rights=get_access(table,3);
  rights=fix_rights_for_db(rights);

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monty@hundin.mysql.fi committed
2549
  if (old_row_exists)
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bk@work.mysql.com committed
2550
  {
2551
    /* update old existing row */
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bk@work.mysql.com committed
2552 2553
    if (rights)
    {
2554
      if ((error= table->file->ha_update_row(table->record[1],
2555 2556
                                             table->record[0])) &&
          error != HA_ERR_RECORD_IS_THE_SAME)
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2557 2558 2559 2560
	goto table_error;			/* purecov: deadcode */
    }
    else	/* must have been a revoke of all privileges */
    {
2561
      if ((error= table->file->ha_delete_row(table->record[1])))
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bk@work.mysql.com committed
2562 2563 2564
	goto table_error;			/* purecov: deadcode */
    }
  }
2565
  else if (rights && (error= table->file->ha_write_row(table->record[0])))
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bk@work.mysql.com committed
2566
  {
2567
    if (table->file->is_fatal_error(error, HA_CHECK_DUP_KEY))
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2568 2569 2570 2571
      goto table_error; /* purecov: deadcode */
  }

  acl_cache->clear(1);				// Clear privilege cache
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2572
  if (old_row_exists)
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bk@work.mysql.com committed
2573 2574
    acl_update_db(combo.user.str,combo.host.str,db,rights);
  else
2575
  if (rights)
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2576 2577 2578 2579
    acl_insert_db(combo.user.str,combo.host.str,db,rights);
  DBUG_RETURN(0);

  /* This could only happen if the grant tables got corrupted */
2580
table_error:
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2581 2582
  table->file->print_error(error,MYF(0));	/* purecov: deadcode */

2583
abort:
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2584 2585 2586 2587
  DBUG_RETURN(-1);
}


2588 2589 2590 2591 2592
static void  
acl_update_proxy_user(ACL_PROXY_USER *new_value, bool is_revoke)
{
  mysql_mutex_assert_owner(&acl_cache->lock);

2593 2594
  DBUG_ENTER("acl_update_proxy_user");
  for (uint i= 0; i < acl_proxy_users.elements; i++)
2595 2596 2597 2598 2599 2600 2601 2602
  {
    ACL_PROXY_USER *acl_user= 
      dynamic_element(&acl_proxy_users, i, ACL_PROXY_USER *);

    if (acl_user->pk_equals(new_value))
    {
      if (is_revoke)
      {
2603
        DBUG_PRINT("info", ("delting ACL_PROXY_USER"));
2604 2605 2606 2607
        delete_dynamic_element(&acl_proxy_users, i);
      }
      else
      {
2608
        DBUG_PRINT("info", ("updating ACL_PROXY_USER"));
2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620
        acl_user->set_data(new_value);
      }
      break;
    }
  }
  DBUG_VOID_RETURN;
}


static void  
acl_insert_proxy_user(ACL_PROXY_USER *new_value)
{
2621
  DBUG_ENTER("acl_insert_proxy_user");
2622 2623
  mysql_mutex_assert_owner(&acl_cache->lock);
  (void) push_dynamic(&acl_proxy_users, (uchar *) new_value);
2624
  my_qsort((uchar*) dynamic_element(&acl_proxy_users, 0, ACL_PROXY_USER *),
2625
           acl_proxy_users.elements,
2626
           sizeof(ACL_PROXY_USER), (qsort_cmp) acl_compare);
2627 2628 2629 2630 2631
  DBUG_VOID_RETURN;
}


static int 
2632
replace_proxies_priv_table(THD *thd, TABLE *table, const LEX_USER *user,
2633 2634 2635
                         const LEX_USER *proxied_user, bool with_grant_arg, 
                         bool revoke_grant)
{
2636
  bool old_row_exists= 0;
2637 2638 2639
  int error;
  uchar user_key[MAX_KEY_LENGTH];
  ACL_PROXY_USER new_grant;
2640
  char grantor[USER_HOST_BUFF_SIZE];
2641

2642
  DBUG_ENTER("replace_proxies_priv_table");
2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663

  if (!initialized)
  {
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
    DBUG_RETURN(-1);
  }

  /* Check if there is such a user in user table in memory? */
  if (!find_acl_user(user->host.str,user->user.str, FALSE))
  {
    my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH), MYF(0));
    DBUG_RETURN(-1);
  }

  table->use_all_columns();
  ACL_PROXY_USER::store_pk (table, &user->host, &user->user, 
                            &proxied_user->host, &proxied_user->user);

  key_copy(user_key, table->record[0], table->key_info,
           table->key_info->key_length);

2664 2665
  get_grantor(thd, grantor);

2666
  table->file->ha_index_init(0, 1);
2667
  if (table->file->index_read_map(table->record[0], user_key,
2668 2669 2670 2671 2672 2673 2674 2675 2676
                                      HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
  {
    DBUG_PRINT ("info", ("Row not found"));
    if (revoke_grant)
    { // no row, no revoke
      my_error(ER_NONEXISTING_GRANT, MYF(0), user->user.str, user->host.str);
      goto abort;
    }
2677 2678 2679 2680 2681
    old_row_exists= 0;
    restore_record(table, s->default_values);
    ACL_PROXY_USER::store_data_record(table, &user->host, &user->user,
                                      &proxied_user->host,
                                      &proxied_user->user,
2682 2683
                                      with_grant_arg,
                                      grantor);
2684 2685 2686
  }
  else
  {
2687 2688 2689
    DBUG_PRINT("info", ("Row found"));
    old_row_exists= 1;
    store_record(table, record[1]);
2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709
  }

  if (old_row_exists)
  {
    /* update old existing row */
    if (!revoke_grant)
    {
      if ((error= table->file->ha_update_row(table->record[1],
                                             table->record[0])) &&
          error != HA_ERR_RECORD_IS_THE_SAME)
	goto table_error;			/* purecov: inspected */
    }
    else
    {
      if ((error= table->file->ha_delete_row(table->record[1])))
	goto table_error;			/* purecov: inspected */
    }
  }
  else if ((error= table->file->ha_write_row(table->record[0])))
  {
2710
    DBUG_PRINT("info", ("error inserting the row"));
2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
    if (table->file->is_fatal_error(error, HA_CHECK_DUP_KEY))
      goto table_error; /* purecov: inspected */
  }

  acl_cache->clear(1);				// Clear privilege cache
  if (old_row_exists)
  {
    new_grant.init(user->host.str, user->user.str,
                   proxied_user->host.str, proxied_user->user.str,
                   with_grant_arg);
    acl_update_proxy_user(&new_grant, revoke_grant);
  }
  else
  {
2725 2726 2727
    new_grant.init(&mem, user->host.str, user->user.str,
                   proxied_user->host.str, proxied_user->user.str,
                   with_grant_arg);
2728 2729 2730 2731 2732 2733 2734 2735
    acl_insert_proxy_user(&new_grant);
  }

  table->file->ha_index_end();
  DBUG_RETURN(0);

  /* This could only happen if the grant tables got corrupted */
table_error:
2736 2737
  DBUG_PRINT("info", ("table error"));
  table->file->print_error(error, MYF(0));	/* purecov: inspected */
2738 2739

abort:
2740
  DBUG_PRINT("info", ("aborting replace_proxies_priv_table"));
2741 2742 2743 2744 2745
  table->file->ha_index_end();
  DBUG_RETURN(-1);
}


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2746 2747 2748 2749
class GRANT_COLUMN :public Sql_alloc
{
public:
  char *column;
2750 2751 2752
  ulong rights;
  uint key_length;
  GRANT_COLUMN(String &c,  ulong y) :rights (y)
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2753
  {
2754
    column= (char*) memdup_root(&memex,c.ptr(), key_length=c.length());
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2755 2756 2757
  }
};

2758

2759
static uchar* get_key_column(GRANT_COLUMN *buff, size_t *length,
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2760 2761 2762
			    my_bool not_used __attribute__((unused)))
{
  *length=buff->key_length;
2763
  return (uchar*) buff->column;
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2764 2765
}

2766

2767
class GRANT_NAME :public Sql_alloc
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2768 2769
{
public:
2770 2771
  acl_host_and_ip host;
  char *db, *user, *tname, *hash_key;
2772
  ulong privs;
2773
  ulong sort;
2774
  size_t key_length;
2775
  GRANT_NAME(const char *h, const char *d,const char *u,
2776 2777
             const char *t, ulong p, bool is_routine);
  GRANT_NAME (TABLE *form, bool is_routine);
2778 2779
  virtual ~GRANT_NAME() {};
  virtual bool ok() { return privs != 0; }
2780
  void set_user_details(const char *h, const char *d,
2781 2782
                        const char *u, const char *t,
                        bool is_routine);
2783 2784 2785 2786 2787 2788 2789
};


class GRANT_TABLE :public GRANT_NAME
{
public:
  ulong cols;
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2790
  HASH hash_columns;
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2791 2792 2793 2794

  GRANT_TABLE(const char *h, const char *d,const char *u,
              const char *t, ulong p, ulong c);
  GRANT_TABLE (TABLE *form, TABLE *col_privs);
2795
  ~GRANT_TABLE();
2796 2797
  bool ok() { return privs != 0 || cols != 0; }
};
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2798

2799

2800
void GRANT_NAME::set_user_details(const char *h, const char *d,
2801 2802
                                  const char *u, const char *t,
                                  bool is_routine)
2803 2804
{
  /* Host given by user */
2805
  update_hostname(&host, strdup_root(&memex, h));
2806 2807 2808 2809 2810 2811
  if (db != d)
  {
    db= strdup_root(&memex, d);
    if (lower_case_table_names)
      my_casedn_str(files_charset_info, db);
  }
2812
  user = strdup_root(&memex,u);
2813
  sort=  get_sort(3,host.hostname,db,user);
2814
  if (tname != t)
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bk@work.mysql.com committed
2815
  {
2816
    tname= strdup_root(&memex, t);
2817
    if (lower_case_table_names || is_routine)
2818
      my_casedn_str(files_charset_info, tname);
2819
  }
2820 2821
  key_length= strlen(d) + strlen(u)+ strlen(t)+3;
  hash_key=   (char*) alloc_root(&memex,key_length);
2822
  strmov(strmov(strmov(hash_key,user)+1,db)+1,tname);
2823 2824
}

2825
GRANT_NAME::GRANT_NAME(const char *h, const char *d,const char *u,
2826
                       const char *t, ulong p, bool is_routine)
2827 2828
  :db(0), tname(0), privs(p)
{
2829
  set_user_details(h, d, u, t, is_routine);
2830
}
2831 2832 2833

GRANT_TABLE::GRANT_TABLE(const char *h, const char *d,const char *u,
                	 const char *t, ulong p, ulong c)
2834
  :GRANT_NAME(h,d,u,t,p, FALSE), cols(c)
2835
{
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2836 2837
  (void) my_hash_init2(&hash_columns,4,system_charset_info,
                   0,0,0, (my_hash_get_key) get_key_column,0,0);
2838
}
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2839

2840

2841
GRANT_NAME::GRANT_NAME(TABLE *form, bool is_routine)
2842
{
2843
  update_hostname(&host, get_field(&memex, form->field[0]));
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2844 2845
  db=    get_field(&memex,form->field[1]);
  user=  get_field(&memex,form->field[2]);
2846 2847
  if (!user)
    user= (char*) "";
2848
  sort=  get_sort(3, host.hostname, db, user);
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2849
  tname= get_field(&memex,form->field[3]);
2850 2851 2852
  if (!db || !tname)
  {
    /* Wrong table row; Ignore it */
2853
    privs= 0;
2854 2855 2856 2857
    return;					/* purecov: inspected */
  }
  if (lower_case_table_names)
  {
2858
    my_casedn_str(files_charset_info, db);
2859 2860 2861
  }
  if (lower_case_table_names || is_routine)
  {
2862
    my_casedn_str(files_charset_info, tname);
2863
  }
2864 2865
  key_length= (strlen(db) + strlen(user) + strlen(tname) + 3);
  hash_key=   (char*) alloc_root(&memex, key_length);
2866 2867 2868
  strmov(strmov(strmov(hash_key,user)+1,db)+1,tname);
  privs = (ulong) form->field[6]->val_int();
  privs = fix_rights_for_table(privs);
2869 2870 2871 2872
}


GRANT_TABLE::GRANT_TABLE(TABLE *form, TABLE *col_privs)
2873
  :GRANT_NAME(form, FALSE)
2874
{
2875
  uchar key[MAX_KEY_LENGTH];
2876 2877 2878 2879

  if (!db || !tname)
  {
    /* Wrong table row; Ignore it */
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2880
    my_hash_clear(&hash_columns);               /* allow for destruction */
2881 2882 2883 2884
    cols= 0;
    return;
  }
  cols= (ulong) form->field[7]->val_int();
2885 2886
  cols =  fix_rights_for_column(cols);

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2887 2888
  (void) my_hash_init2(&hash_columns,4,system_charset_info,
                   0,0,0, (my_hash_get_key) get_key_column,0,0);
2889 2890
  if (cols)
  {
2891 2892
    uint key_prefix_len;
    KEY_PART_INFO *key_part= col_privs->key_info->key_part;
2893
    col_privs->field[0]->store(host.hostname,
2894 2895
                               host.hostname ? (uint) strlen(host.hostname) :
                               0,
2896 2897 2898 2899
                               system_charset_info);
    col_privs->field[1]->store(db,(uint) strlen(db), system_charset_info);
    col_privs->field[2]->store(user,(uint) strlen(user), system_charset_info);
    col_privs->field[3]->store(tname,(uint) strlen(tname), system_charset_info);
2900 2901 2902 2903 2904 2905

    key_prefix_len= (key_part[0].store_length +
                     key_part[1].store_length +
                     key_part[2].store_length +
                     key_part[3].store_length);
    key_copy(key, col_privs->record[0], col_privs->key_info, key_prefix_len);
monty@mysql.com's avatar
monty@mysql.com committed
2906
    col_privs->field[4]->store("",0, &my_charset_latin1);
2907

2908
    col_privs->file->ha_index_init(0, 1);
2909 2910
    if (col_privs->file->index_read_map(col_privs->record[0], (uchar*) key,
                                        (key_part_map)15, HA_READ_KEY_EXACT))
2911
    {
2912
      cols = 0; /* purecov: deadcode */
2913
      col_privs->file->ha_index_end();
2914
      return;
2915
    }
2916
    do
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2917
    {
2918 2919 2920
      String *res,column_name;
      GRANT_COLUMN *mem_check;
      /* As column name is a string, we don't have to supply a buffer */
monty@mysql.com's avatar
monty@mysql.com committed
2921
      res=col_privs->field[4]->val_str(&column_name);
2922 2923 2924
      ulong priv= (ulong) col_privs->field[6]->val_int();
      if (!(mem_check = new GRANT_COLUMN(*res,
                                         fix_rights_for_column(priv))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2925
      {
2926 2927 2928
        /* Don't use this entry */
        privs = cols = 0;			/* purecov: deadcode */
        return;				/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2929
      }
2930 2931 2932 2933 2934 2935
      if (my_hash_insert(&hash_columns, (uchar *) mem_check))
      {
        /* Invalidate this entry */
        privs= cols= 0;
        return;
      }
2936
    } while (!col_privs->file->index_next(col_privs->record[0]) &&
2937
             !key_cmp_if_same(col_privs,key,0,key_prefix_len));
2938
    col_privs->file->ha_index_end();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2939
  }
2940
}
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bk@work.mysql.com committed
2941

2942

2943 2944
GRANT_TABLE::~GRANT_TABLE()
{
Konstantin Osipov's avatar
Konstantin Osipov committed
2945
  my_hash_free(&hash_columns);
2946 2947 2948
}


2949
static uchar* get_grant_table(GRANT_NAME *buff, size_t *length,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2950 2951 2952
			     my_bool not_used __attribute__((unused)))
{
  *length=buff->key_length;
2953
  return (uchar*) buff->hash_key;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2954 2955
}

2956

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2957 2958
void free_grant_table(GRANT_TABLE *grant_table)
{
Konstantin Osipov's avatar
Konstantin Osipov committed
2959
  my_hash_free(&grant_table->hash_columns);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2960 2961
}

2962

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2963 2964
/* Search after a matching grant. Prefer exact grants before not exact ones */

2965
static GRANT_NAME *name_hash_search(HASH *name_hash,
2966 2967 2968
                                    const char *host,const char* ip,
                                    const char *db,
                                    const char *user, const char *tname,
Georgi Kodinov's avatar
merge  
Georgi Kodinov committed
2969
                                    bool exact, bool name_tolower)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2970
{
2971
  char helping [NAME_LEN*2+USERNAME_LENGTH+3], *name_ptr;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2972
  uint len;
2973
  GRANT_NAME *grant_name,*found=0;
2974
  HASH_SEARCH_STATE state;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2975

2976 2977 2978 2979
  name_ptr= strmov(strmov(helping, user) + 1, db) + 1;
  len  = (uint) (strmov(name_ptr, tname) - helping) + 1;
  if (name_tolower)
    my_casedn_str(files_charset_info, name_ptr);
Konstantin Osipov's avatar
Konstantin Osipov committed
2980 2981
  for (grant_name= (GRANT_NAME*) my_hash_first(name_hash, (uchar*) helping,
                                               len, &state);
2982
       grant_name ;
Konstantin Osipov's avatar
Konstantin Osipov committed
2983 2984
       grant_name= (GRANT_NAME*) my_hash_next(name_hash,(uchar*) helping,
                                              len, &state))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2985 2986 2987
  {
    if (exact)
    {
2988 2989
      if (!grant_name->host.hostname ||
          (host &&
2990
	   !my_strcasecmp(system_charset_info, host,
gluh@mysql.com's avatar
gluh@mysql.com committed
2991 2992
                          grant_name->host.hostname)) ||
	  (ip && !strcmp(ip, grant_name->host.hostname)))
2993
	return grant_name;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2994 2995 2996
    }
    else
    {
2997
      if (compare_hostname(&grant_name->host, host, ip) &&
2998 2999
          (!found || found->sort < grant_name->sort))
	found=grant_name;					// Host ok
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bk@work.mysql.com committed
3000 3001 3002 3003 3004 3005
    }
  }
  return found;
}


3006
inline GRANT_NAME *
3007 3008
routine_hash_search(const char *host, const char *ip, const char *db,
                 const char *user, const char *tname, bool proc, bool exact)
3009
{
3010 3011
  return (GRANT_TABLE*)
    name_hash_search(proc ? &proc_priv_hash : &func_priv_hash,
3012
		     host, ip, db, user, tname, exact, TRUE);
3013 3014 3015 3016 3017 3018 3019 3020
}


inline GRANT_TABLE *
table_hash_search(const char *host, const char *ip, const char *db,
		  const char *user, const char *tname, bool exact)
{
  return (GRANT_TABLE*) name_hash_search(&column_priv_hash, host, ip, db,
3021
					 user, tname, exact, FALSE);
3022 3023
}

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3024

3025
inline GRANT_COLUMN *
3026
column_hash_search(GRANT_TABLE *t, const char *cname, uint length)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3027
{
Konstantin Osipov's avatar
Konstantin Osipov committed
3028 3029
  return (GRANT_COLUMN*) my_hash_search(&t->hash_columns,
                                        (uchar*) cname, length);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3030 3031 3032 3033 3034 3035 3036
}


static int replace_column_table(GRANT_TABLE *g_t,
				TABLE *table, const LEX_USER &combo,
				List <LEX_COLUMN> &columns,
				const char *db, const char *table_name,
3037
				ulong rights, bool revoke_grant)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3038 3039
{
  int error=0,result=0;
3040
  uchar key[MAX_KEY_LENGTH];
3041 3042
  uint key_prefix_length;
  KEY_PART_INFO *key_part= table->key_info->key_part;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3043 3044
  DBUG_ENTER("replace_column_table");

3045
  table->use_all_columns();
3046 3047 3048 3049 3050 3051 3052 3053
  table->field[0]->store(combo.host.str,combo.host.length,
                         system_charset_info);
  table->field[1]->store(db,(uint) strlen(db),
                         system_charset_info);
  table->field[2]->store(combo.user.str,combo.user.length,
                         system_charset_info);
  table->field[3]->store(table_name,(uint) strlen(table_name),
                         system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3054

3055
  /* Get length of 4 first key parts */
3056 3057 3058
  key_prefix_length= (key_part[0].store_length + key_part[1].store_length +
                      key_part[2].store_length + key_part[3].store_length);
  key_copy(key, table->record[0], table->key_info, key_prefix_length);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3059

3060
  rights&= COL_ACLS;				// Only ACL for columns
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3061 3062 3063 3064

  /* first fix privileges for all columns in column list */

  List_iterator <LEX_COLUMN> iter(columns);
3065
  class LEX_COLUMN *column;
3066
  table->file->ha_index_init(0, 1);
3067
  while ((column= iter++))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3068
  {
3069
    ulong privileges= column->rights;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3070
    bool old_row_exists=0;
3071
    uchar user_key[MAX_KEY_LENGTH];
3072 3073 3074

    key_restore(table->record[0],key,table->key_info,
                key_prefix_length);
3075
    table->field[4]->store(column->column.ptr(), column->column.length(),
3076
                           system_charset_info);
3077 3078 3079
    /* Get key for the first 4 columns */
    key_copy(user_key, table->record[0], table->key_info,
             table->key_info->key_length);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3080

3081 3082
    if (table->file->index_read_map(table->record[0], user_key, HA_WHOLE_KEY,
                                    HA_READ_KEY_EXACT))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3083 3084 3085
    {
      if (revoke_grant)
      {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3086
	my_error(ER_NONEXISTING_TABLE_GRANT, MYF(0),
3087
                 combo.user.str, combo.host.str,
3088 3089 3090
                 table_name);                   /* purecov: inspected */
	result= -1;                             /* purecov: inspected */
	continue;                               /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3091
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3092
      old_row_exists = 0;
3093
      restore_record(table, s->default_values);		// Get empty record
3094 3095
      key_restore(table->record[0],key,table->key_info,
                  key_prefix_length);
3096
      table->field[4]->store(column->column.ptr(),column->column.length(),
3097
                             system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3098 3099 3100
    }
    else
    {
3101
      ulong tmp= (ulong) table->field[6]->val_int();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3102 3103 3104 3105 3106 3107
      tmp=fix_rights_for_column(tmp);

      if (revoke_grant)
	privileges = tmp & ~(privileges | rights);
      else
	privileges |= tmp;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3108
      old_row_exists = 1;
3109
      store_record(table,record[1]);			// copy original row
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3110 3111
    }

3112
    table->field[6]->store((longlong) get_rights_for_column(privileges), TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3113

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3114
    if (old_row_exists)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3115
    {
3116
      GRANT_COLUMN *grant_column;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3117
      if (privileges)
3118
	error=table->file->ha_update_row(table->record[1],table->record[0]);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3119
      else
3120
	error=table->file->ha_delete_row(table->record[1]);
3121
      if (error && error != HA_ERR_RECORD_IS_THE_SAME)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3122 3123 3124 3125 3126
      {
	table->file->print_error(error,MYF(0)); /* purecov: inspected */
	result= -1;				/* purecov: inspected */
	goto end;				/* purecov: inspected */
      }
3127 3128
      else
        error= 0;
3129 3130
      grant_column= column_hash_search(g_t, column->column.ptr(),
                                       column->column.length());
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3131
      if (grant_column)				// Should always be true
3132
	grant_column->rights= privileges;	// Update hash
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3133 3134 3135
    }
    else					// new grant
    {
3136
      GRANT_COLUMN *grant_column;
3137
      if ((error=table->file->ha_write_row(table->record[0])))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3138 3139 3140 3141 3142
      {
	table->file->print_error(error,MYF(0)); /* purecov: inspected */
	result= -1;				/* purecov: inspected */
	goto end;				/* purecov: inspected */
      }
3143
      grant_column= new GRANT_COLUMN(column->column,privileges);
3144 3145 3146 3147 3148
      if (my_hash_insert(&g_t->hash_columns,(uchar*) grant_column))
      {
        result= -1;
        goto end;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
    }
  }

  /*
    If revoke of privileges on the table level, remove all such privileges
    for all columns
  */

  if (revoke_grant)
  {
3159
    uchar user_key[MAX_KEY_LENGTH];
3160
    key_copy(user_key, table->record[0], table->key_info,
3161 3162
             key_prefix_length);

3163 3164 3165
    if (table->file->index_read_map(table->record[0], user_key,
                                    (key_part_map)15,
                                    HA_READ_KEY_EXACT))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3166 3167
      goto end;

3168
    /* Scan through all rows with the same host,db,user and table */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3169 3170
    do
    {
3171
      ulong privileges = (ulong) table->field[6]->val_int();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3172
      privileges=fix_rights_for_column(privileges);
3173
      store_record(table,record[1]);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3174 3175 3176 3177 3178

      if (privileges & rights)	// is in this record the priv to be revoked ??
      {
	GRANT_COLUMN *grant_column = NULL;
	char  colum_name_buf[HOSTNAME_LENGTH+1];
3179
	String column_name(colum_name_buf,sizeof(colum_name_buf),
3180
                           system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3181 3182 3183

	privileges&= ~rights;
	table->field[6]->store((longlong)
3184
			       get_rights_for_column(privileges), TRUE);
3185
	table->field[4]->val_str(&column_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3186 3187 3188 3189 3190 3191
	grant_column = column_hash_search(g_t,
					  column_name.ptr(),
					  column_name.length());
	if (privileges)
	{
	  int tmp_error;
3192
	  if ((tmp_error=table->file->ha_update_row(table->record[1],
3193 3194
						    table->record[0])) &&
              tmp_error != HA_ERR_RECORD_IS_THE_SAME)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205
	  {					/* purecov: deadcode */
	    table->file->print_error(tmp_error,MYF(0)); /* purecov: deadcode */
	    result= -1;				/* purecov: deadcode */
	    goto end;				/* purecov: deadcode */
	  }
	  if (grant_column)
	    grant_column->rights  = privileges; // Update hash
	}
	else
	{
	  int tmp_error;
3206
	  if ((tmp_error = table->file->ha_delete_row(table->record[1])))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3207 3208 3209 3210 3211 3212
	  {					/* purecov: deadcode */
	    table->file->print_error(tmp_error,MYF(0)); /* purecov: deadcode */
	    result= -1;				/* purecov: deadcode */
	    goto end;				/* purecov: deadcode */
	  }
	  if (grant_column)
Konstantin Osipov's avatar
Konstantin Osipov committed
3213
	    my_hash_delete(&g_t->hash_columns,(uchar*) grant_column);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3214 3215 3216
	}
      }
    } while (!table->file->index_next(table->record[0]) &&
3217
	     !key_cmp_if_same(table, key, 0, key_prefix_length));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3218 3219
  }

3220
end:
3221
  table->file->ha_index_end();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3222 3223 3224
  DBUG_RETURN(result);
}

3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238
static inline void get_grantor(THD *thd, char *grantor)
{
  const char *user= thd->security_ctx->user;
  const char *host= thd->security_ctx->host_or_ip;

#if defined(HAVE_REPLICATION)
  if (thd->slave_thread && thd->has_invoker())
  {
    user= thd->get_invoker_user().str;
    host= thd->get_invoker_host().str;
  }
#endif
  strxmov(grantor, user, "@", host, NullS);
}
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bk@work.mysql.com committed
3239 3240 3241 3242

static int replace_table_table(THD *thd, GRANT_TABLE *grant_table,
			       TABLE *table, const LEX_USER &combo,
			       const char *db, const char *table_name,
3243 3244
			       ulong rights, ulong col_rights,
			       bool revoke_grant)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3245
{
3246
  char grantor[USER_HOST_BUFF_SIZE];
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3247
  int old_row_exists = 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3248
  int error=0;
3249
  ulong store_table_rights, store_col_rights;
3250
  uchar user_key[MAX_KEY_LENGTH];
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3251 3252
  DBUG_ENTER("replace_table_table");

3253
  get_grantor(thd, grantor);
3254 3255 3256 3257
  /*
    The following should always succeed as new users are created before
    this function is called!
  */
3258
  if (!find_acl_user(combo.host.str,combo.user.str, FALSE))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3259
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3260 3261
    my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH),
               MYF(0));	/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3262 3263 3264
    DBUG_RETURN(-1);				/* purecov: deadcode */
  }

3265
  table->use_all_columns();
3266
  restore_record(table, s->default_values);     // Get empty record
3267 3268
  table->field[0]->store(combo.host.str,combo.host.length,
                         system_charset_info);
3269
  table->field[1]->store(db,(uint) strlen(db), system_charset_info);
3270 3271 3272 3273
  table->field[2]->store(combo.user.str,combo.user.length,
                         system_charset_info);
  table->field[3]->store(table_name,(uint) strlen(table_name),
                         system_charset_info);
3274
  store_record(table,record[1]);			// store at pos 1
3275 3276
  key_copy(user_key, table->record[0], table->key_info,
           table->key_info->key_length);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3277

3278 3279 3280
  if (table->file->index_read_idx_map(table->record[0], 0, user_key,
                                      HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3281 3282 3283 3284 3285 3286 3287 3288
  {
    /*
      The following should never happen as we first check the in memory
      grant tables for the user.  There is however always a small change that
      the user has modified the grant tables directly.
    */
    if (revoke_grant)
    { // no row, no revoke
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3289 3290
      my_error(ER_NONEXISTING_TABLE_GRANT, MYF(0),
               combo.user.str, combo.host.str,
3291
               table_name);		        /* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3292 3293
      DBUG_RETURN(-1);				/* purecov: deadcode */
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3294
    old_row_exists = 0;
3295
    restore_record(table,record[1]);			// Get saved record
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3296 3297
  }

3298 3299
  store_table_rights= get_rights_for_table(rights);
  store_col_rights=   get_rights_for_column(col_rights);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3300
  if (old_row_exists)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3301
  {
3302
    ulong j,k;
3303
    store_record(table,record[1]);
3304 3305
    j = (ulong) table->field[6]->val_int();
    k = (ulong) table->field[7]->val_int();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3306 3307 3308

    if (revoke_grant)
    {
3309
      /* column rights are already fixed in mysql_table_grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3310 3311 3312 3313
      store_table_rights=j & ~store_table_rights;
    }
    else
    {
3314 3315
      store_table_rights|= j;
      store_col_rights|=   k;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3316 3317 3318
    }
  }

3319
  table->field[4]->store(grantor,(uint) strlen(grantor), system_charset_info);
3320 3321
  table->field[6]->store((longlong) store_table_rights, TRUE);
  table->field[7]->store((longlong) store_col_rights, TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3322
  rights=fix_rights_for_table(store_table_rights);
3323
  col_rights=fix_rights_for_column(store_col_rights);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3324

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3325
  if (old_row_exists)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3326 3327 3328
  {
    if (store_table_rights || store_col_rights)
    {
3329 3330 3331
      if ((error=table->file->ha_update_row(table->record[1],
                                            table->record[0])) &&
          error != HA_ERR_RECORD_IS_THE_SAME)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3332 3333
	goto table_error;			/* purecov: deadcode */
    }
3334
    else if ((error = table->file->ha_delete_row(table->record[1])))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3335 3336 3337 3338
      goto table_error;				/* purecov: deadcode */
  }
  else
  {
3339
    error=table->file->ha_write_row(table->record[0]);
3340
    if (table->file->is_fatal_error(error, HA_CHECK_DUP_KEY))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3341 3342 3343
      goto table_error;				/* purecov: deadcode */
  }

3344
  if (rights | col_rights)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3345
  {
3346
    grant_table->privs= rights;
3347
    grant_table->cols=	col_rights;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3348 3349 3350
  }
  else
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
3351
    my_hash_delete(&column_priv_hash,(uchar*) grant_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3352 3353 3354
  }
  DBUG_RETURN(0);

3355 3356
  /* This should never happen */
table_error:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3357 3358 3359 3360 3361
  table->file->print_error(error,MYF(0)); /* purecov: deadcode */
  DBUG_RETURN(-1); /* purecov: deadcode */
}


3362 3363 3364 3365
/**
  @retval       0  success
  @retval      -1  error
*/
3366
static int replace_routine_table(THD *thd, GRANT_NAME *grant_name,
3367
			      TABLE *table, const LEX_USER &combo,
3368 3369
			      const char *db, const char *routine_name,
			      bool is_proc, ulong rights, bool revoke_grant)
3370
{
3371
  char grantor[USER_HOST_BUFF_SIZE];
3372 3373 3374
  int old_row_exists= 1;
  int error=0;
  ulong store_proc_rights;
3375
  DBUG_ENTER("replace_routine_table");
3376 3377 3378 3379 3380 3381 3382

  if (!initialized)
  {
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
    DBUG_RETURN(-1);
  }

3383
  get_grantor(thd, grantor);
3384
  /*
3385 3386 3387 3388
    New users are created before this function is called.

    There may be some cases where a routine's definer is removed but the
    routine remains.
3389 3390
  */

3391
  table->use_all_columns();
3392
  restore_record(table, s->default_values);		// Get empty record
3393 3394 3395
  table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
  table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
  table->field[2]->store(combo.user.str,combo.user.length, &my_charset_latin1);
3396 3397
  table->field[3]->store(routine_name,(uint) strlen(routine_name),
                         &my_charset_latin1);
3398
  table->field[4]->store((longlong)(is_proc ?
3399 3400
                                    TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION),
                         TRUE);
3401 3402
  store_record(table,record[1]);			// store at pos 1

3403 3404 3405 3406
  if (table->file->index_read_idx_map(table->record[0], 0,
                                      (uchar*) table->field[0]->ptr,
                                      HA_WHOLE_KEY,
                                      HA_READ_KEY_EXACT))
3407 3408 3409 3410 3411 3412 3413 3414 3415
  {
    /*
      The following should never happen as we first check the in memory
      grant tables for the user.  There is however always a small change that
      the user has modified the grant tables directly.
    */
    if (revoke_grant)
    { // no row, no revoke
      my_error(ER_NONEXISTING_PROC_GRANT, MYF(0),
3416
               combo.user.str, combo.host.str, routine_name);
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440
      DBUG_RETURN(-1);
    }
    old_row_exists= 0;
    restore_record(table,record[1]);			// Get saved record
  }

  store_proc_rights= get_rights_for_procedure(rights);
  if (old_row_exists)
  {
    ulong j;
    store_record(table,record[1]);
    j= (ulong) table->field[6]->val_int();

    if (revoke_grant)
    {
      /* column rights are already fixed in mysql_table_grant */
      store_proc_rights=j & ~store_proc_rights;
    }
    else
    {
      store_proc_rights|= j;
    }
  }

3441
  table->field[5]->store(grantor,(uint) strlen(grantor), &my_charset_latin1);
3442
  table->field[6]->store((longlong) store_proc_rights, TRUE);
3443 3444 3445 3446 3447 3448
  rights=fix_rights_for_procedure(store_proc_rights);

  if (old_row_exists)
  {
    if (store_proc_rights)
    {
3449 3450 3451
      if ((error=table->file->ha_update_row(table->record[1],
                                            table->record[0])) &&
          error != HA_ERR_RECORD_IS_THE_SAME)
3452 3453
	goto table_error;
    }
3454
    else if ((error= table->file->ha_delete_row(table->record[1])))
3455 3456 3457 3458
      goto table_error;
  }
  else
  {
3459
    error=table->file->ha_write_row(table->record[0]);
3460
    if (table->file->is_fatal_error(error, HA_CHECK_DUP_KEY))
3461 3462 3463 3464 3465 3466 3467 3468 3469
      goto table_error;
  }

  if (rights)
  {
    grant_name->privs= rights;
  }
  else
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
3470 3471
    my_hash_delete(is_proc ? &proc_priv_hash : &func_priv_hash,(uchar*)
                   grant_name);
3472 3473 3474 3475 3476 3477 3478 3479 3480 3481
  }
  DBUG_RETURN(0);

  /* This should never happen */
table_error:
  table->file->print_error(error,MYF(0));
  DBUG_RETURN(-1);
}


3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494
/*
  Store table level and column level grants in the privilege tables

  SYNOPSIS
    mysql_table_grant()
    thd			Thread handle
    table_list		List of tables to give grant
    user_list		List of users to give grant
    columns		List of columns to give grant
    rights		Table level grant
    revoke_grant	Set to 1 if this is a REVOKE command

  RETURN
3495 3496
    FALSE ok
    TRUE  error
3497 3498
*/

3499
int mysql_table_grant(THD *thd, TABLE_LIST *table_list,
3500 3501 3502
		      List <LEX_USER> &user_list,
		      List <LEX_COLUMN> &columns, ulong rights,
		      bool revoke_grant)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3503
{
3504
  ulong column_priv= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3505
  List_iterator <LEX_USER> str_list (user_list);
3506
  LEX_USER *Str, *tmp_Str;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3507
  TABLE_LIST tables[3];
3508
  bool create_new_users=0;
3509
  char *db_name, *table_name;
3510
  bool save_binlog_row_based;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3511 3512 3513 3514
  DBUG_ENTER("mysql_table_grant");

  if (!initialized)
  {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3515 3516
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0),
             "--skip-grant-tables");	/* purecov: inspected */
3517
    DBUG_RETURN(TRUE);				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3518 3519 3520
  }
  if (rights & ~TABLE_ACLS)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3521 3522
    my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
               MYF(0));
3523
    DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3524 3525
  }

3526
  if (!revoke_grant)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3527
  {
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3528
    if (columns.elements)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3529
    {
3530 3531
      class LEX_COLUMN *column;
      List_iterator <LEX_COLUMN> column_iter(columns);
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3532

3533
      if (open_normal_and_derived_tables(thd, table_list, 0))
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3534
        DBUG_RETURN(TRUE);
3535 3536

      while ((column = column_iter++))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3537
      {
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3538
        uint unused_field_idx= NO_CACHED_FIELD_INDEX;
3539 3540
        TABLE_LIST *dummy;
        Field *f=find_field_in_table_ref(thd, table_list, column->column.ptr(),
3541
                                         column->column.length(),
3542
                                         column->column.ptr(), NULL, NULL,
3543
                                         NULL, TRUE, FALSE,
3544
                                         &unused_field_idx, FALSE, &dummy);
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3545
        if (f == (Field*)0)
3546
        {
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3547 3548
          my_error(ER_BAD_FIELD_ERROR, MYF(0),
                   column->column.c_ptr(), table_list->alias);
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3549
          DBUG_RETURN(TRUE);
3550
        }
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3551 3552
        if (f == (Field *)-1)
          DBUG_RETURN(TRUE);
3553
        column_priv|= column->rights;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3554
      }
3555
      close_mysql_tables(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3556
    }
3557
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3558
    {
3559 3560
      if (!(rights & CREATE_ACL))
      {
3561 3562
        char buf[FN_REFLEN + 1];
        build_table_filename(buf, sizeof(buf) - 1, table_list->db,
3563
                             table_list->table_name, reg_ext, 0);
3564 3565
        fn_format(buf, buf, "", "", MY_UNPACK_FILENAME  | MY_RESOLVE_SYMLINKS |
                                    MY_RETURN_REAL_PATH | MY_APPEND_EXT);
3566 3567
        if (access(buf,F_OK))
        {
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3568
          my_error(ER_NO_SUCH_TABLE, MYF(0), table_list->db, table_list->alias);
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
3569
          DBUG_RETURN(TRUE);
3570 3571 3572 3573 3574 3575 3576 3577
        }
      }
      if (table_list->grant.want_privilege)
      {
        char command[128];
        get_privilege_desc(command, sizeof(command),
                           table_list->grant.want_privilege);
        my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
3578 3579
                 command, thd->security_ctx->priv_user,
                 thd->security_ctx->host_or_ip, table_list->alias);
3580 3581
        DBUG_RETURN(-1);
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3582 3583 3584 3585 3586
    }
  }

  /* open the mysql.tables_priv and mysql.columns_priv tables */

3587 3588 3589 3590 3591 3592 3593 3594
  tables[0].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("user"), "user", TL_WRITE);
  tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("tables_priv"),
                           "tables_priv", TL_WRITE);
  tables[2].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("columns_priv"),
                           "columns_priv", TL_WRITE);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3595
  tables[0].next_local= tables[0].next_global= tables+1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3596
  /* Don't open column table if we don't need it ! */
3597 3598
  if (column_priv || (revoke_grant && ((rights & COL_ACLS) || columns.elements)))
    tables[1].next_local= tables[1].next_global= tables+2;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3599

3600 3601 3602 3603 3604
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
3605 3606
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
3607

3608 3609 3610 3611 3612
#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
3613
  if (thd->slave_thread && rpl_filter->is_on())
3614
  {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3615 3616 3617
    /*
      The tables must be marked "updating" so that tables_ok() takes them into
      account in tests.
3618
    */
3619
    tables[0].updating= tables[1].updating= tables[2].updating= 1;
lars@mysql.com's avatar
lars@mysql.com committed
3620
    if (!(thd->spcont || rpl_filter->tables_ok(0, tables)))
3621 3622
    {
      /* Restore the state of binlog format */
3623
      DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3624 3625
      if (save_binlog_row_based)
        thd->set_current_stmt_binlog_format_row();
3626
      DBUG_RETURN(FALSE);
3627
    }
3628
  }
3629 3630
#endif

3631 3632 3633 3634 3635 3636
  /* 
    The lock api is depending on the thd->lex variable which needs to be
    re-initialized.
  */
  Query_tables_list backup;
  thd->lex->reset_n_backup_query_tables_list(&backup);
3637 3638 3639 3640 3641 3642
  /*
    Restore Query_tables_list::sql_command value, which was reset
    above, as the code writing query to the binary log assumes that
    this value corresponds to the statement being executed.
  */
  thd->lex->sql_command= backup.sql_command;
3643
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3644
  {						// Should never happen
3645
    /* Restore the state of binlog format */
3646
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3647
    thd->lex->restore_backup_query_tables_list(&backup);
3648 3649
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
3650
    DBUG_RETURN(TRUE);				/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3651 3652
  }

3653 3654
  if (!revoke_grant)
    create_new_users= test_if_create_new_users(thd);
3655
  bool result= FALSE;
Marc Alff's avatar
Marc Alff committed
3656 3657
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
3658 3659
  MEM_ROOT *old_root= thd->mem_root;
  thd->mem_root= &memex;
3660
  grant_version++;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3661

3662
  while ((tmp_Str = str_list++))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3663
  {
3664
    int error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3665
    GRANT_TABLE *grant_table;
3666 3667 3668 3669 3670
    if (!(Str= get_current_user(thd, tmp_Str)))
    {
      result= TRUE;
      continue;
    }  
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3671
    /* Create user if needed */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3672
    error=replace_user_table(thd, tables[0].table, *Str,
serg@serg.mylan's avatar
serg@serg.mylan committed
3673
			     0, revoke_grant, create_new_users,
monty@mysql.com's avatar
monty@mysql.com committed
3674 3675
                             test(thd->variables.sql_mode &
                                  MODE_NO_AUTO_CREATE_USER));
3676
    if (error)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3677
    {
3678
      result= TRUE;				// Remember error
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3679 3680 3681
      continue;					// Add next user
    }

3682 3683
    db_name= table_list->get_db_name();
    table_name= table_list->get_table_name();
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3684

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3685
    /* Find/create cached table grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3686
    grant_table= table_hash_search(Str->host.str, NullS, db_name,
3687
				   Str->user.str, table_name, 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3688 3689 3690 3691
    if (!grant_table)
    {
      if (revoke_grant)
      {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3692
	my_error(ER_NONEXISTING_TABLE_GRANT, MYF(0),
3693
                 Str->user.str, Str->host.str, table_list->table_name);
3694
	result= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3695 3696
	continue;
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3697
      grant_table = new GRANT_TABLE (Str->host.str, db_name,
3698
				     Str->user.str, table_name,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3699 3700
				     rights,
				     column_priv);
3701
      if (!grant_table ||
Kristofer Pettersson's avatar
merge  
Kristofer Pettersson committed
3702
        my_hash_insert(&column_priv_hash,(uchar*) grant_table))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3703
      {
3704
	result= TRUE;				/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3705 3706 3707 3708 3709 3710 3711
	continue;				/* purecov: deadcode */
      }
    }

    /* If revoke_grant, calculate the new column privilege for tables_priv */
    if (revoke_grant)
    {
3712 3713
      class LEX_COLUMN *column;
      List_iterator <LEX_COLUMN> column_iter(columns);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3714 3715 3716
      GRANT_COLUMN *grant_column;

      /* Fix old grants */
3717
      while ((column = column_iter++))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3718 3719
      {
	grant_column = column_hash_search(grant_table,
3720 3721
					  column->column.ptr(),
					  column->column.length());
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3722
	if (grant_column)
3723
	  grant_column->rights&= ~(column->rights | rights);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3724 3725
      }
      /* scan trough all columns to get new column grant */
3726
      column_priv= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3727 3728
      for (uint idx=0 ; idx < grant_table->hash_columns.records ; idx++)
      {
Konstantin Osipov's avatar
Konstantin Osipov committed
3729 3730
        grant_column= (GRANT_COLUMN*)
          my_hash_element(&grant_table->hash_columns, idx);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742
	grant_column->rights&= ~rights;		// Fix other columns
	column_priv|= grant_column->rights;
      }
    }
    else
    {
      column_priv|= grant_table->cols;
    }


    /* update table and columns */

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3743
    if (replace_table_table(thd, grant_table, tables[1].table, *Str,
3744
			    db_name, table_name,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3745
			    rights, column_priv, revoke_grant))
3746 3747
    {
      /* Should only happen if table is crashed */
3748
      result= TRUE;			       /* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3749 3750 3751
    }
    else if (tables[2].table)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3752
      if ((replace_column_table(grant_table, tables[2].table, *Str,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3753
				columns,
3754
				db_name, table_name,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3755 3756
				rights, revoke_grant)))
      {
3757
	result= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3758 3759 3760
      }
    }
  }
3761
  thd->mem_root= old_root;
Marc Alff's avatar
Marc Alff committed
3762
  mysql_mutex_unlock(&acl_cache->lock);
3763 3764 3765

  if (!result) /* success */
  {
3766
    result= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
3767 3768
  }

Marc Alff's avatar
Marc Alff committed
3769
  mysql_rwlock_unlock(&LOCK_grant);
3770 3771

  if (!result) /* success */
3772
    my_ok(thd);
3773

3774
  /* Tables are automatically closed */
3775
  thd->lex->restore_backup_query_tables_list(&backup);
3776
  /* Restore the state of binlog format */
3777
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3778 3779
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3780 3781 3782 3783
  DBUG_RETURN(result);
}


3784
/**
3785
  Store routine level grants in the privilege tables
3786

3787 3788 3789 3790 3791 3792
  @param thd Thread handle
  @param table_list List of routines to give grant
  @param is_proc Is this a list of procedures?
  @param user_list List of users to give grant
  @param rights Table level grant
  @param revoke_grant Is this is a REVOKE command?
3793

3794 3795 3796
  @return
    @retval FALSE Success.
    @retval TRUE An error occurred.
3797 3798
*/

3799 3800
bool mysql_routine_grant(THD *thd, TABLE_LIST *table_list, bool is_proc,
			 List <LEX_USER> &user_list, ulong rights,
3801
			 bool revoke_grant, bool write_to_binlog)
3802 3803
{
  List_iterator <LEX_USER> str_list (user_list);
3804
  LEX_USER *Str, *tmp_Str;
3805 3806
  TABLE_LIST tables[2];
  bool create_new_users=0, result=0;
3807
  char *db_name, *table_name;
3808
  bool save_binlog_row_based;
3809
  DBUG_ENTER("mysql_routine_grant");
3810 3811 3812

  if (!initialized)
  {
3813 3814
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0),
             "--skip-grant-tables");
3815 3816 3817 3818
    DBUG_RETURN(TRUE);
  }
  if (rights & ~PROC_ACLS)
  {
3819 3820
    my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
               MYF(0));
3821 3822 3823 3824 3825
    DBUG_RETURN(TRUE);
  }

  if (!revoke_grant)
  {
3826
    if (sp_exist_routines(thd, table_list, is_proc))
3827 3828 3829 3830 3831
      DBUG_RETURN(TRUE);
  }

  /* open the mysql.user and mysql.procs_priv tables */

3832 3833 3834 3835
  tables[0].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("user"), "user", TL_WRITE);
  tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("procs_priv"), "procs_priv", TL_WRITE);
3836 3837
  tables[0].next_local= tables[0].next_global= tables+1;

3838 3839 3840 3841 3842
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
3843 3844
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
3845

3846 3847 3848 3849 3850
#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
3851
  if (thd->slave_thread && rpl_filter->is_on())
3852 3853 3854 3855 3856 3857
  {
    /*
      The tables must be marked "updating" so that tables_ok() takes them into
      account in tests.
    */
    tables[0].updating= tables[1].updating= 1;
lars@mysql.com's avatar
lars@mysql.com committed
3858
    if (!(thd->spcont || rpl_filter->tables_ok(0, tables)))
3859 3860
    {
      /* Restore the state of binlog format */
3861
      DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3862 3863
      if (save_binlog_row_based)
        thd->set_current_stmt_binlog_format_row();
3864
      DBUG_RETURN(FALSE);
3865
    }
3866 3867 3868
  }
#endif

3869
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
3870
  {						// Should never happen
3871
    /* Restore the state of binlog format */
3872
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3873 3874
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
3875 3876 3877 3878 3879
    DBUG_RETURN(TRUE);
  }

  if (!revoke_grant)
    create_new_users= test_if_create_new_users(thd);
Marc Alff's avatar
Marc Alff committed
3880 3881
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
3882 3883 3884 3885 3886
  MEM_ROOT *old_root= thd->mem_root;
  thd->mem_root= &memex;

  DBUG_PRINT("info",("now time to iterate and add users"));

3887
  while ((tmp_Str= str_list++))
3888 3889 3890
  {
    int error;
    GRANT_NAME *grant_name;
3891 3892 3893 3894 3895
    if (!(Str= get_current_user(thd, tmp_Str)))
    {
      result= TRUE;
      continue;
    }  
3896 3897
    /* Create user if needed */
    error=replace_user_table(thd, tables[0].table, *Str,
serg@serg.mylan's avatar
serg@serg.mylan committed
3898
			     0, revoke_grant, create_new_users,
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monty@mysql.com committed
3899 3900
                             test(thd->variables.sql_mode &
                                  MODE_NO_AUTO_CREATE_USER));
3901 3902 3903 3904 3905 3906 3907
    if (error)
    {
      result= TRUE;				// Remember error
      continue;					// Add next user
    }

    db_name= table_list->db;
3908
    table_name= table_list->table_name;
3909

3910 3911
    grant_name= routine_hash_search(Str->host.str, NullS, db_name,
                                    Str->user.str, table_name, is_proc, 1);
3912 3913 3914 3915
    if (!grant_name)
    {
      if (revoke_grant)
      {
3916 3917
        my_error(ER_NONEXISTING_PROC_GRANT, MYF(0),
	         Str->user.str, Str->host.str, table_name);
3918 3919 3920 3921
	result= TRUE;
	continue;
      }
      grant_name= new GRANT_NAME(Str->host.str, db_name,
3922
				 Str->user.str, table_name,
3923
				 rights, TRUE);
3924
      if (!grant_name ||
Kristofer Pettersson's avatar
merge  
Kristofer Pettersson committed
3925 3926
        my_hash_insert(is_proc ?
                       &proc_priv_hash : &func_priv_hash,(uchar*) grant_name))
3927 3928 3929 3930 3931
      {
        result= TRUE;
	continue;
      }
    }
3932

3933
    if (replace_routine_table(thd, grant_name, tables[1].table, *Str,
3934 3935
                              db_name, table_name, is_proc, rights, 
                              revoke_grant) != 0)
3936 3937 3938 3939 3940 3941
    {
      result= TRUE;
      continue;
    }
  }
  thd->mem_root= old_root;
Marc Alff's avatar
Marc Alff committed
3942
  mysql_mutex_unlock(&acl_cache->lock);
3943 3944

  if (write_to_binlog)
3945
  {
3946
    if (write_bin_log(thd, FALSE, thd->query(), thd->query_length()))
3947
      result= TRUE;
3948 3949
  }

Marc Alff's avatar
Marc Alff committed
3950
  mysql_rwlock_unlock(&LOCK_grant);
3951
  /* Restore the state of binlog format */
3952
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
3953 3954
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
3955

3956 3957 3958 3959 3960
  /* Tables are automatically closed */
  DBUG_RETURN(result);
}


3961
bool mysql_grant(THD *thd, const char *db, List <LEX_USER> &list,
3962
                 ulong rights, bool revoke_grant, bool is_proxy)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3963 3964
{
  List_iterator <LEX_USER> str_list (list);
3965
  LEX_USER *Str, *tmp_Str, *proxied_user= NULL;
gluh@mysql.com/gluh.(none)'s avatar
gluh@mysql.com/gluh.(none) committed
3966
  char tmp_db[NAME_LEN+1];
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3967
  bool create_new_users=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3968
  TABLE_LIST tables[2];
3969
  bool save_binlog_row_based;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3970 3971 3972
  DBUG_ENTER("mysql_grant");
  if (!initialized)
  {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3973 3974
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0),
             "--skip-grant-tables");	/* purecov: tested */
3975
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3976 3977
  }

3978 3979 3980
  if (lower_case_table_names && db)
  {
    strmov(tmp_db,db);
3981
    my_casedn_str(files_charset_info, tmp_db);
3982 3983
    db=tmp_db;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3984

3985 3986
  if (is_proxy)
  {
3987
    DBUG_ASSERT(!db);
3988 3989 3990
    proxied_user= str_list++;
  }

3991
  /* open the mysql.user and mysql.db or mysql.proxies_priv tables */
3992 3993
  tables[0].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("user"), "user", TL_WRITE);
3994 3995 3996
  if (is_proxy)

    tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
3997 3998
                             C_STRING_WITH_LEN("proxies_priv"),
                             "proxies_priv", 
3999 4000 4001 4002 4003 4004
                             TL_WRITE);
  else
    tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
                             C_STRING_WITH_LEN("db"), 
                             "db", 
                             TL_WRITE);
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VIEW  
bell@sanja.is.com.ua committed
4005
  tables[0].next_local= tables[0].next_global= tables+1;
4006

4007 4008 4009 4010 4011
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
4012 4013
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
4014

4015 4016 4017 4018 4019
#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
4020
  if (thd->slave_thread && rpl_filter->is_on())
4021
  {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4022 4023 4024
    /*
      The tables must be marked "updating" so that tables_ok() takes them into
      account in tests.
4025
    */
4026
    tables[0].updating= tables[1].updating= 1;
lars@mysql.com's avatar
lars@mysql.com committed
4027
    if (!(thd->spcont || rpl_filter->tables_ok(0, tables)))
4028 4029
    {
      /* Restore the state of binlog format */
4030
      DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
4031 4032
      if (save_binlog_row_based)
        thd->set_current_stmt_binlog_format_row();
4033
      DBUG_RETURN(FALSE);
4034
    }
4035
  }
4036 4037
#endif

4038
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4039
  {						// This should never happen
4040
    /* Restore the state of binlog format */
4041
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
4042 4043
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
4044
    DBUG_RETURN(TRUE);				/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4045 4046
  }

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4047 4048
  if (!revoke_grant)
    create_new_users= test_if_create_new_users(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4049

4050
  /* go through users in user_list */
Marc Alff's avatar
Marc Alff committed
4051 4052
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4053 4054 4055
  grant_version++;

  int result=0;
4056
  while ((tmp_Str = str_list++))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4057
  {
4058 4059 4060 4061
    if (!(Str= get_current_user(thd, tmp_Str)))
    {
      result= TRUE;
      continue;
gluh@mysql.com/gluh.(none)'s avatar
gluh@mysql.com/gluh.(none) committed
4062
    }
4063 4064 4065 4066 4067 4068 4069
    /*
      No User, but a password?
      They did GRANT ... TO CURRENT_USER() IDENTIFIED BY ... !
      Get the current user, and shallow-copy the new password to them!
    */
    if (!tmp_Str->user.str && tmp_Str->password.str)
      Str->password= tmp_Str->password;
serg@serg.mylan's avatar
serg@serg.mylan committed
4070 4071
    if (replace_user_table(thd, tables[0].table, *Str,
                           (!db ? rights : 0), revoke_grant, create_new_users,
monty@mysql.com's avatar
monty@mysql.com committed
4072 4073
                           test(thd->variables.sql_mode &
                                MODE_NO_AUTO_CREATE_USER)))
4074
      result= -1;
4075
    else if (db)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4076
    {
4077 4078 4079 4080 4081 4082 4083 4084 4085
      ulong db_rights= rights & DB_ACLS;
      if (db_rights  == rights)
      {
	if (replace_db_table(tables[1].table, db, *Str, db_rights,
			     revoke_grant))
	  result= -1;
      }
      else
      {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
4086
	my_error(ER_WRONG_USAGE, MYF(0), "DB GRANT", "GLOBAL PRIVILEGES");
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4087
	result= -1;
4088
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4089
    }
4090 4091
    else if (is_proxy)
    {
4092
      if (replace_proxies_priv_table (thd, tables[1].table, Str, proxied_user,
4093 4094 4095 4096
                                    rights & GRANT_ACL ? TRUE : FALSE, 
                                    revoke_grant))
        result= -1;
    }
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bk@work.mysql.com committed
4097
  }
Marc Alff's avatar
Marc Alff committed
4098
  mysql_mutex_unlock(&acl_cache->lock);
4099 4100 4101

  if (!result)
  {
4102
    result= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
4103 4104
  }

Marc Alff's avatar
Marc Alff committed
4105
  mysql_rwlock_unlock(&LOCK_grant);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4106 4107

  if (!result)
4108
    my_ok(thd);
4109
  /* Restore the state of binlog format */
4110
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
4111 4112
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
4113

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4114 4115 4116
  DBUG_RETURN(result);
}

4117 4118

/* Free grant array if possible */
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bk@work.mysql.com committed
4119 4120 4121 4122

void  grant_free(void)
{
  DBUG_ENTER("grant_free");
Konstantin Osipov's avatar
Konstantin Osipov committed
4123 4124 4125
  my_hash_free(&column_priv_hash);
  my_hash_free(&proc_priv_hash);
  my_hash_free(&func_priv_hash);
4126
  free_root(&memex,MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4127 4128 4129 4130
  DBUG_VOID_RETURN;
}


4131 4132 4133
/**
  @brief Initialize structures responsible for table/column-level privilege
   checking and load information for them from tables in the 'mysql' database.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4134

4135 4136 4137
  @return Error status
    @retval 0 OK
    @retval 1 Could not initialize grant subsystem.
4138
*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4139

4140
my_bool grant_init()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4141
{
4142
  THD  *thd;
4143 4144 4145 4146 4147
  my_bool return_val;
  DBUG_ENTER("grant_init");

  if (!(thd= new THD))
    DBUG_RETURN(1);				/* purecov: deadcode */
4148
  thd->thread_stack= (char*) &thd;
4149 4150 4151 4152 4153 4154 4155 4156 4157
  thd->store_globals();
  return_val=  grant_reload(thd);
  delete thd;
  /* Remember that we don't have a THD */
  my_pthread_setspecific_ptr(THR_THD,  0);
  DBUG_RETURN(return_val);
}


4158 4159
/**
  @brief Helper function to grant_reload_procs_priv
4160

4161
  Reads the procs_priv table into memory hash.
4162

4163 4164 4165 4166 4167 4168 4169 4170
  @param table A pointer to the procs_priv table structure.

  @see grant_reload
  @see grant_reload_procs_priv

  @return Error state
    @retval TRUE An error occurred
    @retval FALSE Success
4171 4172
*/

4173
static my_bool grant_load_procs_priv(TABLE *p_table)
4174
{
4175
  MEM_ROOT *memex_ptr;
4176
  my_bool return_val= 1;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4177
  bool check_no_resolve= specialflag & SPECIAL_NO_RESOLVE;
4178 4179
  MEM_ROOT **save_mem_root_ptr= my_pthread_getspecific_ptr(MEM_ROOT**,
                                                           THR_MALLOC);
4180
  DBUG_ENTER("grant_load_procs_priv");
4181
  (void) my_hash_init(&proc_priv_hash, &my_charset_utf8_bin,
Konstantin Osipov's avatar
Konstantin Osipov committed
4182 4183
                      0,0,0, (my_hash_get_key) get_grant_table,
                      0,0);
4184
  (void) my_hash_init(&func_priv_hash, &my_charset_utf8_bin,
Konstantin Osipov's avatar
Konstantin Osipov committed
4185 4186
                      0,0,0, (my_hash_get_key) get_grant_table,
                      0,0);
4187
  p_table->file->ha_index_init(0, 1);
4188
  p_table->use_all_columns();
4189 4190

  if (!p_table->file->index_first(p_table->record[0]))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4191
  {
4192 4193 4194 4195
    memex_ptr= &memex;
    my_pthread_setspecific_ptr(THR_MALLOC, &memex_ptr);
    do
    {
4196 4197
      GRANT_NAME *mem_check;
      HASH *hash;
4198
      if (!(mem_check=new (memex_ptr) GRANT_NAME(p_table, TRUE)))
4199
      {
4200 4201
        /* This could only happen if we are out memory */
        goto end_unlock;
4202
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4203

4204 4205
      if (check_no_resolve)
      {
4206
	if (hostname_requires_resolving(mem_check->host.hostname))
4207
	{
4208
          sql_print_warning("'procs_priv' entry '%s %s@%s' "
4209
                            "ignored in --skip-name-resolve mode.",
4210
                            mem_check->tname, mem_check->user,
4211 4212
                            mem_check->host.hostname ?
                            mem_check->host.hostname : "");
4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230
          continue;
        }
      }
      if (p_table->field[4]->val_int() == TYPE_ENUM_PROCEDURE)
      {
        hash= &proc_priv_hash;
      }
      else
      if (p_table->field[4]->val_int() == TYPE_ENUM_FUNCTION)
      {
        hash= &func_priv_hash;
      }
      else
      {
        sql_print_warning("'procs_priv' entry '%s' "
                          "ignored, bad routine type",
                          mem_check->tname);
        continue;
4231 4232
      }

4233
      mem_check->privs= fix_rights_for_procedure(mem_check->privs);
4234
      if (! mem_check->ok())
4235 4236
        delete mem_check;
      else if (my_hash_insert(hash, (uchar*) mem_check))
4237
      {
4238 4239
        delete mem_check;
        goto end_unlock;
4240 4241
      }
    }
4242
    while (!p_table->file->index_next(p_table->record[0]));
4243
  }
4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268
  /* Return ok */
  return_val= 0;

end_unlock:
  p_table->file->ha_index_end();
  my_pthread_setspecific_ptr(THR_MALLOC, save_mem_root_ptr);
  DBUG_RETURN(return_val);
}


/**
  @brief Initialize structures responsible for table/column-level privilege
    checking and load information about grants from open privilege tables.

  @param thd Current thread
  @param tables List containing open "mysql.tables_priv" and
    "mysql.columns_priv" tables.

  @see grant_reload

  @return Error state
    @retval FALSE Success
    @retval TRUE Error
*/

4269
static my_bool grant_load(THD *thd, TABLE_LIST *tables)
4270 4271 4272 4273 4274 4275 4276
{
  MEM_ROOT *memex_ptr;
  my_bool return_val= 1;
  TABLE *t_table= 0, *c_table= 0;
  bool check_no_resolve= specialflag & SPECIAL_NO_RESOLVE;
  MEM_ROOT **save_mem_root_ptr= my_pthread_getspecific_ptr(MEM_ROOT**,
                                                           THR_MALLOC);
4277
  ulong old_sql_mode= thd->variables.sql_mode;
4278
  DBUG_ENTER("grant_load");
4279 4280 4281

  thd->variables.sql_mode&= ~MODE_PAD_CHAR_TO_FULL_LENGTH;

4282
  (void) my_hash_init(&column_priv_hash, &my_charset_utf8_bin,
Konstantin Osipov's avatar
Konstantin Osipov committed
4283 4284
                      0,0,0, (my_hash_get_key) get_grant_table,
                      (my_hash_free_key) free_grant_table,0);
4285 4286 4287 4288 4289 4290 4291 4292

  t_table = tables[0].table;
  c_table = tables[1].table;
  t_table->file->ha_index_init(0, 1);
  t_table->use_all_columns();
  c_table->use_all_columns();

  if (!t_table->file->index_first(t_table->record[0]))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4293
  {
4294 4295 4296
    memex_ptr= &memex;
    my_pthread_setspecific_ptr(THR_MALLOC, &memex_ptr);
    do
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4297
    {
4298 4299
      GRANT_TABLE *mem_check;
      if (!(mem_check=new (memex_ptr) GRANT_TABLE(t_table,c_table)))
4300 4301 4302 4303
      {
	/* This could only happen if we are out memory */
	goto end_unlock;
      }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4304

4305
      if (check_no_resolve)
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4306
      {
jimw@mysql.com's avatar
jimw@mysql.com committed
4307
	if (hostname_requires_resolving(mem_check->host.hostname))
4308
	{
4309
          sql_print_warning("'tables_priv' entry '%s %s@%s' "
4310
                            "ignored in --skip-name-resolve mode.",
4311 4312
                            mem_check->tname,
                            mem_check->user ? mem_check->user : "",
4313 4314
                            mem_check->host.hostname ?
                            mem_check->host.hostname : "");
4315 4316
	  continue;
	}
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4317 4318
      }

4319 4320
      if (! mem_check->ok())
	delete mem_check;
4321
      else if (my_hash_insert(&column_priv_hash,(uchar*) mem_check))
4322 4323 4324 4325
      {
	delete mem_check;
	goto end_unlock;
      }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4326
    }
4327
    while (!t_table->file->index_next(t_table->record[0]));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4328
  }
4329

4330 4331 4332
  return_val=0;					// Return ok

end_unlock:
4333
  thd->variables.sql_mode= old_sql_mode;
4334
  t_table->file->ha_index_end();
4335
  my_pthread_setspecific_ptr(THR_MALLOC, save_mem_root_ptr);
4336
  DBUG_RETURN(return_val);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4337 4338 4339
}


4340 4341 4342
/**
  @brief Helper function to grant_reload. Reloads procs_priv table is it
    exists.
4343

4344
  @param thd A pointer to the thread handler object.
4345

4346
  @see grant_reload
4347

4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359
  @return Error state
    @retval FALSE Success
    @retval TRUE An error has occurred.
*/

static my_bool grant_reload_procs_priv(THD *thd)
{
  HASH old_proc_priv_hash, old_func_priv_hash;
  TABLE_LIST table;
  my_bool return_val= FALSE;
  DBUG_ENTER("grant_reload_procs_priv");

Konstantin Osipov's avatar
Konstantin Osipov committed
4360 4361 4362
  table.init_one_table("mysql", 5, "procs_priv",
                       strlen("procs_priv"), "procs_priv",
                       TL_READ);
4363
  table.open_type= OT_BASE_ONLY;
4364

4365
  if (open_and_lock_tables(thd, &table, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
4366 4367
    DBUG_RETURN(TRUE);

Marc Alff's avatar
Marc Alff committed
4368
  mysql_rwlock_wrlock(&LOCK_grant);
4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382
  /* Save a copy of the current hash if we need to undo the grant load */
  old_proc_priv_hash= proc_priv_hash;
  old_func_priv_hash= func_priv_hash;

  if ((return_val= grant_load_procs_priv(table.table)))
  {
    /* Error; Reverting to old hash */
    DBUG_PRINT("error",("Reverting to old privileges"));
    grant_free();
    proc_priv_hash= old_proc_priv_hash;
    func_priv_hash= old_func_priv_hash;
  }
  else
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
4383 4384
    my_hash_free(&old_proc_priv_hash);
    my_hash_free(&old_func_priv_hash);
4385
  }
Marc Alff's avatar
Marc Alff committed
4386
  mysql_rwlock_unlock(&LOCK_grant);
4387

4388
  close_mysql_tables(thd);
4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405
  DBUG_RETURN(return_val);
}


/**
  @brief Reload information about table and column level privileges if possible

  @param thd Current thread

  Locked tables are checked by acl_reload() and doesn't have to be checked
  in this call.
  This function is also used for initialization of structures responsible
  for table/column-level privilege checking.

  @return Error state
    @retval FALSE Success
    @retval TRUE  Error
4406
*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4407

4408
my_bool grant_reload(THD *thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4409
{
4410 4411
  TABLE_LIST tables[2];
  HASH old_column_priv_hash;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4412
  MEM_ROOT old_mem;
4413
  my_bool return_val= 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4414 4415
  DBUG_ENTER("grant_reload");

4416 4417 4418 4419
  /* Don't do anything if running with --skip-grant-tables */
  if (!initialized)
    DBUG_RETURN(0);

4420 4421 4422 4423 4424 4425
  tables[0].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("tables_priv"),
                           "tables_priv", TL_READ);
  tables[1].init_one_table(C_STRING_WITH_LEN("mysql"),
                           C_STRING_WITH_LEN("columns_priv"),
                           "columns_priv", TL_READ);
4426
  tables[0].next_local= tables[0].next_global= tables+1;
4427
  tables[0].open_type= tables[1].open_type= OT_BASE_ONLY;
4428

4429 4430 4431 4432
  /*
    To avoid deadlocks we should obtain table locks before
    obtaining LOCK_grant rwlock.
  */
4433
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
4434 4435
    goto end;

Marc Alff's avatar
Marc Alff committed
4436
  mysql_rwlock_wrlock(&LOCK_grant);
4437
  old_column_priv_hash= column_priv_hash;
4438 4439 4440 4441 4442

  /*
    Create a new memory pool but save the current memory pool to make an undo
    opertion possible in case of failure.
  */
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
4443
  old_mem= memex;
4444
  init_sql_alloc(&memex, ACL_ALLOC_BLOCK_SIZE, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4445

4446
  if ((return_val= grant_load(thd, tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4447
  {						// Error. Revert to old hash
4448
    DBUG_PRINT("error",("Reverting to old privileges"));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4449
    grant_free();				/* purecov: deadcode */
4450
    column_priv_hash= old_column_priv_hash;	/* purecov: deadcode */
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
4451
    memex= old_mem;				/* purecov: deadcode */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4452 4453 4454
  }
  else
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
4455
    my_hash_free(&old_column_priv_hash);
4456
    free_root(&old_mem,MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4457
  }
Marc Alff's avatar
Marc Alff committed
4458
  mysql_rwlock_unlock(&LOCK_grant);
4459
  close_mysql_tables(thd);
4460 4461

  /*
4462
    It is OK failing to load procs_priv table because we may be
4463 4464 4465
    working with 4.1 privilege tables.
  */
  if (grant_reload_procs_priv(thd))
4466
    return_val= 1;
4467

Marc Alff's avatar
Marc Alff committed
4468
  mysql_rwlock_wrlock(&LOCK_grant);
4469
  grant_version++;
Marc Alff's avatar
Marc Alff committed
4470
  mysql_rwlock_unlock(&LOCK_grant);
4471 4472

end:
4473
  DBUG_RETURN(return_val);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4474 4475
}

4476

4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502
/**
  @brief Check table level grants

  @param thd          Thread handler
  @param want_access  Bits of privileges user needs to have.
  @param tables       List of tables to check. The user should have
                      'want_access' to all tables in list.
  @param any_combination_will_do TRUE if it's enough to have any privilege for
    any combination of the table columns.
  @param number       Check at most this number of tables.
  @param no_errors    TRUE if no error should be sent directly to the client.

  If table->grant.want_privilege != 0 then the requested privileges where
  in the set of COL_ACLS but access was not granted on the table level. As
  a consequence an extra check of column privileges is required.

  Specifically if this function returns FALSE the user has some kind of
  privilege on a combination of columns in each table.

  This function is usually preceeded by check_access which establish the
  User-, Db- and Host access rights.

  @see check_access
  @see check_table_access

  @note This functions assumes that either number of tables to be inspected
4503 4504 4505 4506
     by it is limited explicitly (i.e. is is not UINT_MAX) or table list
     used and thd->lex->query_tables_own_last value correspond to each
     other (the latter should be either 0 or point to next_global member
     of one of elements of this table list).
4507 4508 4509 4510 4511 4512 4513 4514

   @return Access status
     @retval FALSE Access granted; But column privileges might need to be
      checked.
     @retval TRUE The user did not have the requested privileges on any of the
      tables.

*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4515

4516
bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
4517
                 bool any_combination_will_do, uint number, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4518
{
4519 4520
  TABLE_LIST *tl;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
4521
  Security_context *sctx= thd->security_ctx;
4522
  uint i;
Marc Alff's avatar
Marc Alff committed
4523
  ulong orig_want_access= want_access;
4524 4525
  DBUG_ENTER("check_grant");
  DBUG_ASSERT(number > 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4526

4527
  /*
4528 4529 4530 4531 4532 4533 4534 4535
    Walk through the list of tables that belong to the query and save the
    requested access (orig_want_privilege) to be able to use it when
    checking access rights to the underlying tables of a view. Our grant
    system gradually eliminates checked bits from want_privilege and thus
    after all checks are done we can no longer use it.
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
4536
  */
4537 4538 4539
  for (i= 0, tl= tables;
       i < number  && tl != first_not_own_table;
       tl= tl->next_global, i++)
4540
  {
4541 4542 4543 4544
    /*
      Save a copy of the privileges without the SHOW_VIEW_ACL attribute.
      It will be checked during making view.
    */
4545
    tl->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
4546 4547
  }

Marc Alff's avatar
Marc Alff committed
4548
  mysql_rwlock_rdlock(&LOCK_grant);
4549 4550 4551
  for (tl= tables;
       tl && number-- && tl != first_not_own_table;
       tl= tl->next_global)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4552
  {
4553
    sctx = test(tl->security_ctx) ? tl->security_ctx : thd->security_ctx;
4554

4555 4556 4557 4558
    const ACL_internal_table_access *access=
      get_cached_table_access(&tl->grant.m_internal,
                              tl->get_db_name(),
                              tl->get_table_name());
Marc Alff's avatar
Marc Alff committed
4559 4560 4561

    if (access)
    {
4562
      switch(access->check(orig_want_access, &tl->grant.privilege))
Marc Alff's avatar
Marc Alff committed
4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581
      {
      case ACL_INTERNAL_ACCESS_GRANTED:
        /*
          Currently,
          -  the information_schema does not subclass ACL_internal_table_access,
          there are no per table privilege checks for I_S,
          - the performance schema does use per tables checks, but at most
          returns 'CHECK_GRANT', and never 'ACCESS_GRANTED'.
          so this branch is not used.
        */
        DBUG_ASSERT(0);
      case ACL_INTERNAL_ACCESS_DENIED:
        goto err;
      case ACL_INTERNAL_ACCESS_CHECK_GRANT:
        break;
      }
    }

    want_access= orig_want_access;
4582 4583 4584 4585
    want_access&= ~sctx->master_access;
    if (!want_access)
      continue;                                 // ok

4586 4587
    if (!(~tl->grant.privilege & want_access) ||
        tl->is_anonymous_derived_table() || tl->schema_table)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4588
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4589
      /*
4590
        It is subquery in the FROM clause. VIEW set tl->derived after
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4591 4592
        table opening, but this function always called before table opening.
      */
4593
      if (!tl->referencing_view)
4594 4595 4596 4597 4598 4599
      {
        /*
          If it's a temporary table created for a subquery in the FROM
          clause, or an INFORMATION_SCHEMA table, drop the request for
          a privilege.
        */
4600
        tl->grant.want_privilege= 0;
4601 4602
      }
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4603
    }
4604 4605 4606 4607 4608 4609 4610
    GRANT_TABLE *grant_table= table_hash_search(sctx->host, sctx->ip,
                                                tl->get_db_name(),
                                                sctx->priv_user,
                                                tl->get_table_name(),
                                                FALSE);

    if (!grant_table)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4611
    {
4612
      want_access &= ~tl->grant.privilege;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4613 4614
      goto err;					// No grants
    }
4615 4616 4617 4618 4619 4620 4621

    /*
      For SHOW COLUMNS, SHOW INDEX it is enough to have some
      privileges on any column combination on the table.
    */
    if (any_combination_will_do)
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4622

4623 4624 4625 4626
    tl->grant.grant_table= grant_table; // Remember for column test
    tl->grant.version= grant_version;
    tl->grant.privilege|= grant_table->privs;
    tl->grant.want_privilege= ((want_access & COL_ACLS) & ~tl->grant.privilege);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4627

4628
    if (!(~tl->grant.privilege & want_access))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4629 4630
      continue;

4631
    if (want_access & ~(grant_table->cols | tl->grant.privilege))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4632
    {
4633
      want_access &= ~(grant_table->cols | tl->grant.privilege);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4634 4635 4636
      goto err;					// impossible
    }
  }
Marc Alff's avatar
Marc Alff committed
4637
  mysql_rwlock_unlock(&LOCK_grant);
4638
  DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4639

4640
err:
Marc Alff's avatar
Marc Alff committed
4641
  mysql_rwlock_unlock(&LOCK_grant);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4642
  if (!no_errors)				// Not a silent skip of table
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4643
  {
4644 4645
    char command[128];
    get_privilege_desc(command, sizeof(command), want_access);
4646 4647
    my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
             command,
4648 4649
             sctx->priv_user,
             sctx->host_or_ip,
4650
             tl ? tl->get_table_name() : "unknown");
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4651
  }
4652 4653 4654 4655
  DBUG_RETURN(TRUE);
}


4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673
/*
  Check column rights in given security context

  SYNOPSIS
    check_grant_column()
    thd                  thread handler
    grant                grant information structure
    db_name              db name
    table_name           table  name
    name                 column name
    length               column name length
    sctx                 security context

  RETURN
    FALSE OK
    TRUE  access denied
*/

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4674
bool check_grant_column(THD *thd, GRANT_INFO *grant,
4675
			const char *db_name, const char *table_name,
4676
			const char *name, uint length,  Security_context *sctx)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4677 4678 4679
{
  GRANT_TABLE *grant_table;
  GRANT_COLUMN *grant_column;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4680
  ulong want_access= grant->want_privilege & ~grant->privilege;
monty@mysql.com's avatar
monty@mysql.com committed
4681
  DBUG_ENTER("check_grant_column");
4682
  DBUG_PRINT("enter", ("table: %s  want_access: %lu", table_name, want_access));
monty@mysql.com's avatar
monty@mysql.com committed
4683

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4684
  if (!want_access)
monty@mysql.com's avatar
monty@mysql.com committed
4685
    DBUG_RETURN(0);				// Already checked
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4686

Marc Alff's avatar
Marc Alff committed
4687
  mysql_rwlock_rdlock(&LOCK_grant);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4688

4689
  /* reload table if someone has modified any grants */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4690

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4691
  if (grant->version != grant_version)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4692
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4693
    grant->grant_table=
4694 4695
      table_hash_search(sctx->host, sctx->ip, db_name,
			sctx->priv_user,
monty@mysql.com's avatar
monty@mysql.com committed
4696
			table_name, 0);         /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4697
    grant->version= grant_version;		/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4698
  }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4699
  if (!(grant_table= grant->grant_table))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4700 4701 4702 4703 4704
    goto err;					/* purecov: deadcode */

  grant_column=column_hash_search(grant_table, name, length);
  if (grant_column && !(~grant_column->rights & want_access))
  {
Marc Alff's avatar
Marc Alff committed
4705
    mysql_rwlock_unlock(&LOCK_grant);
monty@mysql.com's avatar
monty@mysql.com committed
4706
    DBUG_RETURN(0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4707 4708
  }

4709
err:
Marc Alff's avatar
Marc Alff committed
4710
  mysql_rwlock_unlock(&LOCK_grant);
4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754
  char command[128];
  get_privilege_desc(command, sizeof(command), want_access);
  my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
           command,
           sctx->priv_user,
           sctx->host_or_ip,
           name,
           table_name);
  DBUG_RETURN(1);
}


/*
  Check the access right to a column depending on the type of table.

  SYNOPSIS
    check_column_grant_in_table_ref()
    thd              thread handler
    table_ref        table reference where to check the field
    name             name of field to check
    length           length of name

  DESCRIPTION
    Check the access rights to a column depending on the type of table
    reference where the column is checked. The function provides a
    generic interface to check column access rights that hides the
    heterogeneity of the column representation - whether it is a view
    or a stored table colum.

  RETURN
    FALSE OK
    TRUE  access denied
*/

bool check_column_grant_in_table_ref(THD *thd, TABLE_LIST * table_ref,
                                     const char *name, uint length)
{
  GRANT_INFO *grant;
  const char *db_name;
  const char *table_name;
  Security_context *sctx= test(table_ref->security_ctx) ?
                          table_ref->security_ctx : thd->security_ctx;

  if (table_ref->view || table_ref->field_translation)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4755
  {
4756
    /* View or derived information schema table. */
4757
    ulong view_privs;
4758 4759 4760
    grant= &(table_ref->grant);
    db_name= table_ref->view_db.str;
    table_name= table_ref->view_name.str;
4761
    if (table_ref->belong_to_view && 
4762
        thd->lex->sql_command == SQLCOM_SHOW_FIELDS)
4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773
    {
      view_privs= get_column_grant(thd, grant, db_name, table_name, name);
      if (view_privs & VIEW_ANY_ACL)
      {
        table_ref->belong_to_view->allowed_show= TRUE;
        return FALSE;
      }
      table_ref->belong_to_view->allowed_show= FALSE;
      my_message(ER_VIEW_NO_EXPLAIN, ER(ER_VIEW_NO_EXPLAIN), MYF(0));
      return TRUE;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4774
  }
4775 4776 4777 4778 4779
  else
  {
    /* Normal or temporary table. */
    TABLE *table= table_ref->table;
    grant= &(table->grant);
4780 4781
    db_name= table->s->db.str;
    table_name= table->s->table_name.str;
4782 4783 4784 4785 4786 4787 4788 4789
  }

  if (grant->want_privilege)
    return check_grant_column(thd, grant, db_name, table_name, name,
                              length, sctx);
  else
    return FALSE;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4790 4791 4792
}


4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803
/** 
  @brief check if a query can access a set of columns

  @param  thd  the current thread
  @param  want_access_arg  the privileges requested
  @param  fields an iterator over the fields of a table reference.
  @return Operation status
    @retval 0 Success
    @retval 1 Falure
  @details This function walks over the columns of a table reference 
   The columns may originate from different tables, depending on the kind of
4804
   table reference, e.g. join, view.
4805 4806 4807 4808 4809
   For each table it will retrieve the grant information and will use it
   to check the required access privileges for the fields requested from it.
*/    
bool check_grant_all_columns(THD *thd, ulong want_access_arg, 
                             Field_iterator_table_ref *fields)
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bk@work.mysql.com committed
4810
{
4811
  Security_context *sctx= thd->security_ctx;
4812 4813
  ulong want_access= want_access_arg;
  const char *table_name= NULL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4814

4815 4816
  const char* db_name; 
  GRANT_INFO *grant;
4817 4818
  /* Initialized only to make gcc happy */
  GRANT_TABLE *grant_table= NULL;
4819 4820 4821 4822 4823
  /* 
     Flag that gets set if privilege checking has to be performed on column
     level.
  */
  bool using_column_privileges= FALSE;
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bk@work.mysql.com committed
4824

Marc Alff's avatar
Marc Alff committed
4825
  mysql_rwlock_rdlock(&LOCK_grant);
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bk@work.mysql.com committed
4826

4827
  for (; !fields->end_of_fields(); fields->next())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4828
  {
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VIEW  
bell@sanja.is.com.ua committed
4829
    const char *field_name= fields->name();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4830

4831
    if (table_name != fields->get_table_name())
4832
    {
4833 4834
      table_name= fields->get_table_name();
      db_name= fields->get_db_name();
4835 4836 4837 4838
      grant= fields->grant();
      /* get a fresh one for each table */
      want_access= want_access_arg & ~grant->privilege;
      if (want_access)
4839
      {
4840 4841
        /* reload table if someone has modified any grants */
        if (grant->version != grant_version)
4842
        {
4843 4844 4845 4846 4847
          grant->grant_table=
            table_hash_search(sctx->host, sctx->ip, db_name,
                              sctx->priv_user,
                              table_name, 0);	/* purecov: inspected */
          grant->version= grant_version;	/* purecov: inspected */
4848 4849
        }

4850 4851
        grant_table= grant->grant_table;
        DBUG_ASSERT (grant_table);
4852 4853
      }
    }
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bk@work.mysql.com committed
4854

4855 4856 4857 4858 4859
    if (want_access)
    {
      GRANT_COLUMN *grant_column= 
        column_hash_search(grant_table, field_name,
                           (uint) strlen(field_name));
4860 4861
      if (grant_column)
        using_column_privileges= TRUE;
4862 4863 4864
      if (!grant_column || (~grant_column->rights & want_access))
        goto err;
    }
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bk@work.mysql.com committed
4865
  }
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Marc Alff committed
4866
  mysql_rwlock_unlock(&LOCK_grant);
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4867 4868
  return 0;

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monty@narttu.mysql.fi committed
4869
err:
Marc Alff's avatar
Marc Alff committed
4870
  mysql_rwlock_unlock(&LOCK_grant);
4871

4872 4873
  char command[128];
  get_privilege_desc(command, sizeof(command), want_access);
4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888
  /*
    Do not give an error message listing a column name unless the user has
    privilege to see all columns.
  */
  if (using_column_privileges)
    my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
             command, sctx->priv_user,
             sctx->host_or_ip, table_name); 
  else
    my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
             command,
             sctx->priv_user,
             sctx->host_or_ip,
             fields->name(),
             table_name);
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4889 4890 4891 4892
  return 1;
}


4893 4894 4895 4896 4897 4898
static bool check_grant_db_routine(THD *thd, const char *db, HASH *hash)
{
  Security_context *sctx= thd->security_ctx;

  for (uint idx= 0; idx < hash->records; ++idx)
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
4899
    GRANT_NAME *item= (GRANT_NAME*) my_hash_element(hash, idx);
4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912

    if (strcmp(item->user, sctx->priv_user) == 0 &&
        strcmp(item->db, db) == 0 &&
        compare_hostname(&item->host, sctx->host, sctx->ip))
    {
      return FALSE;
    }
  }

  return TRUE;
}


4913
/*
4914
  Check if a user has the right to access a database
4915
  Access is accepted if he has a grant for any table/routine in the database
4916
  Return 1 if access is denied
4917
*/
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4918 4919 4920

bool check_grant_db(THD *thd,const char *db)
{
4921
  Security_context *sctx= thd->security_ctx;
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gluh@mysql.com/gluh.(none) committed
4922
  char helping [NAME_LEN+USERNAME_LENGTH+2];
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bk@work.mysql.com committed
4923
  uint len;
4924
  bool error= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4925

4926
  len= (uint) (strmov(strmov(helping, sctx->priv_user) + 1, db) - helping) + 1;
4927

Marc Alff's avatar
Marc Alff committed
4928
  mysql_rwlock_rdlock(&LOCK_grant);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4929

4930
  for (uint idx=0 ; idx < column_priv_hash.records ; idx++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4931
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
4932 4933 4934
    GRANT_TABLE *grant_table= (GRANT_TABLE*)
      my_hash_element(&column_priv_hash,
                      idx);
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bk@work.mysql.com committed
4935 4936
    if (len < grant_table->key_length &&
	!memcmp(grant_table->hash_key,helping,len) &&
4937
        compare_hostname(&grant_table->host, sctx->host, sctx->ip))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4938
    {
4939
      error= FALSE; /* Found match. */
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bk@work.mysql.com committed
4940 4941 4942
      break;
    }
  }
4943 4944 4945 4946 4947

  if (error)
    error= check_grant_db_routine(thd, db, &proc_priv_hash) &&
           check_grant_db_routine(thd, db, &func_priv_hash);

Marc Alff's avatar
Marc Alff committed
4948
  mysql_rwlock_unlock(&LOCK_grant);
4949

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bk@work.mysql.com committed
4950 4951 4952
  return error;
}

4953 4954

/****************************************************************************
4955
  Check routine level grants
4956 4957

  SYNPOSIS
4958
   bool check_grant_routine()
4959 4960
   thd		Thread handler
   want_access  Bits of privileges user needs to have
4961 4962
   procs	List of routines to check. The user should have 'want_access'
   is_proc	True if the list is all procedures, else functions
4963 4964 4965 4966 4967 4968 4969 4970
   no_errors	If 0 then we write an error. The error is sent directly to
		the client

   RETURN
     0  ok
     1  Error: User did not have the requested privielges
****************************************************************************/

4971
bool check_grant_routine(THD *thd, ulong want_access,
4972
			 TABLE_LIST *procs, bool is_proc, bool no_errors)
4973 4974
{
  TABLE_LIST *table;
4975
  Security_context *sctx= thd->security_ctx;
4976 4977
  char *user= sctx->priv_user;
  char *host= sctx->priv_host;
4978
  DBUG_ENTER("check_grant_routine");
4979

4980
  want_access&= ~sctx->master_access;
4981 4982 4983
  if (!want_access)
    DBUG_RETURN(0);                             // ok

Marc Alff's avatar
Marc Alff committed
4984
  mysql_rwlock_rdlock(&LOCK_grant);
4985 4986 4987
  for (table= procs; table; table= table->next_global)
  {
    GRANT_NAME *grant_proc;
4988
    if ((grant_proc= routine_hash_search(host, sctx->ip, table->db, user,
4989
					 table->table_name, is_proc, 0)))
4990 4991 4992 4993 4994 4995 4996 4997
      table->grant.privilege|= grant_proc->privs;

    if (want_access & ~table->grant.privilege)
    {
      want_access &= ~table->grant.privilege;
      goto err;
    }
  }
Marc Alff's avatar
Marc Alff committed
4998
  mysql_rwlock_unlock(&LOCK_grant);
4999 5000
  DBUG_RETURN(0);
err:
Marc Alff's avatar
Marc Alff committed
5001
  mysql_rwlock_unlock(&LOCK_grant);
5002 5003 5004 5005 5006
  if (!no_errors)
  {
    char buff[1024];
    const char *command="";
    if (table)
5007
      strxmov(buff, table->db, ".", table->table_name, NullS);
5008 5009 5010
    if (want_access & EXECUTE_ACL)
      command= "execute";
    else if (want_access & ALTER_PROC_ACL)
5011
      command= "alter routine";
5012 5013 5014 5015 5016 5017 5018 5019 5020
    else if (want_access & GRANT_ACL)
      command= "grant";
    my_error(ER_PROCACCESS_DENIED_ERROR, MYF(0),
             command, user, host, table ? buff : "unknown");
  }
  DBUG_RETURN(1);
}


5021 5022
/*
  Check if routine has any of the 
5023
  routine level grants
5024 5025 5026 5027 5028 5029 5030 5031 5032
  
  SYNPOSIS
   bool    check_routine_level_acl()
   thd	        Thread handler
   db           Database name
   name         Routine name

  RETURN
   0            Ok 
5033
   1            error
5034 5035
*/

acurtis@xiphis.org's avatar
acurtis@xiphis.org committed
5036 5037
bool check_routine_level_acl(THD *thd, const char *db, const char *name, 
                             bool is_proc)
5038 5039
{
  bool no_routine_acl= 1;
5040 5041
  GRANT_NAME *grant_proc;
  Security_context *sctx= thd->security_ctx;
Marc Alff's avatar
Marc Alff committed
5042
  mysql_rwlock_rdlock(&LOCK_grant);
5043 5044 5045 5046 5047
  if ((grant_proc= routine_hash_search(sctx->priv_host,
                                       sctx->ip, db,
                                       sctx->priv_user,
                                       name, is_proc, 0)))
    no_routine_acl= !(grant_proc->privs & SHOW_PROC_ACLS);
Marc Alff's avatar
Marc Alff committed
5048
  mysql_rwlock_unlock(&LOCK_grant);
5049 5050 5051 5052
  return no_routine_acl;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5053
/*****************************************************************************
5054
  Functions to retrieve the grant for a table/column  (for SHOW functions)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5055 5056
*****************************************************************************/

5057
ulong get_table_grant(THD *thd, TABLE_LIST *table)
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bk@work.mysql.com committed
5058
{
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5059
  ulong privilege;
5060
  Security_context *sctx= thd->security_ctx;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5061 5062 5063
  const char *db = table->db ? table->db : thd->db;
  GRANT_TABLE *grant_table;

Marc Alff's avatar
Marc Alff committed
5064
  mysql_rwlock_rdlock(&LOCK_grant);
5065 5066 5067
#ifdef EMBEDDED_LIBRARY
  grant_table= NULL;
#else
5068
  grant_table= table_hash_search(sctx->host, sctx->ip, db, sctx->priv_user,
5069
				 table->table_name, 0);
5070
#endif
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bk@work.mysql.com committed
5071 5072 5073 5074
  table->grant.grant_table=grant_table; // Remember for column test
  table->grant.version=grant_version;
  if (grant_table)
    table->grant.privilege|= grant_table->privs;
5075
  privilege= table->grant.privilege;
Marc Alff's avatar
Marc Alff committed
5076
  mysql_rwlock_unlock(&LOCK_grant);
5077
  return privilege;
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5078 5079 5080
}


5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098
/*
  Determine the access priviliges for a field.

  SYNOPSIS
    get_column_grant()
    thd         thread handler
    grant       grants table descriptor
    db_name     name of database that the field belongs to
    table_name  name of table that the field belongs to
    field_name  name of field

  DESCRIPTION
    The procedure may also modify: grant->grant_table and grant->version.

  RETURN
    The access priviliges for the field db_name.table_name.field_name
*/

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5099 5100 5101
ulong get_column_grant(THD *thd, GRANT_INFO *grant,
                       const char *db_name, const char *table_name,
                       const char *field_name)
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bk@work.mysql.com committed
5102 5103 5104
{
  GRANT_TABLE *grant_table;
  GRANT_COLUMN *grant_column;
5105
  ulong priv;
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bk@work.mysql.com committed
5106

Marc Alff's avatar
Marc Alff committed
5107
  mysql_rwlock_rdlock(&LOCK_grant);
5108
  /* reload table if someone has modified any grants */
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bell@sanja.is.com.ua committed
5109
  if (grant->version != grant_version)
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bk@work.mysql.com committed
5110
  {
5111
    Security_context *sctx= thd->security_ctx;
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VIEW  
bell@sanja.is.com.ua committed
5112
    grant->grant_table=
5113 5114
      table_hash_search(sctx->host, sctx->ip,
                        db_name, sctx->priv_user,
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VIEW  
bell@sanja.is.com.ua committed
5115 5116
			table_name, 0);	        /* purecov: inspected */
    grant->version= grant_version;              /* purecov: inspected */
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bk@work.mysql.com committed
5117 5118
  }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5119 5120
  if (!(grant_table= grant->grant_table))
    priv= grant->privilege;
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bk@work.mysql.com committed
5121 5122
  else
  {
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VIEW  
bell@sanja.is.com.ua committed
5123 5124
    grant_column= column_hash_search(grant_table, field_name,
                                     (uint) strlen(field_name));
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bk@work.mysql.com committed
5125
    if (!grant_column)
5126
      priv= (grant->privilege | grant_table->privs);
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bk@work.mysql.com committed
5127
    else
5128
      priv= (grant->privilege | grant_table->privs | grant_column->rights);
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bk@work.mysql.com committed
5129
  }
Marc Alff's avatar
Marc Alff committed
5130
  mysql_rwlock_unlock(&LOCK_grant);
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5131 5132 5133
  return priv;
}

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VIEW  
bell@sanja.is.com.ua committed
5134

5135
/* Help function for mysql_show_grants */
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bk@work.mysql.com committed
5136

5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148
static void add_user_option(String *grant, ulong value, const char *name)
{
  if (value)
  {
    char buff[22], *p; // just as in int2str
    grant->append(' ');
    grant->append(name, strlen(name));
    grant->append(' ');
    p=int10_to_str(value, buff, 10);
    grant->append(buff,p-buff);
  }
}
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5149 5150

static const char *command_array[]=
5151
{
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VIEW  
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5152 5153 5154 5155
  "SELECT", "INSERT", "UPDATE", "DELETE", "CREATE", "DROP", "RELOAD",
  "SHUTDOWN", "PROCESS","FILE", "GRANT", "REFERENCES", "INDEX",
  "ALTER", "SHOW DATABASES", "SUPER", "CREATE TEMPORARY TABLES",
  "LOCK TABLES", "EXECUTE", "REPLICATION SLAVE", "REPLICATION CLIENT",
5156
  "CREATE VIEW", "SHOW VIEW", "CREATE ROUTINE", "ALTER ROUTINE",
5157
  "CREATE USER", "EVENT", "TRIGGER", "CREATE TABLESPACE"
5158
};
5159

5160 5161
static uint command_lengths[]=
{
5162
  6, 6, 6, 6, 6, 4, 6, 8, 7, 4, 5, 10, 5, 5, 14, 5, 23, 11, 7, 17, 18, 11, 9,
5163
  14, 13, 11, 5, 7, 17
5164 5165
};

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bk@work.mysql.com committed
5166

5167 5168 5169 5170 5171
static int show_routine_grants(THD *thd, LEX_USER *lex_user, HASH *hash,
                               const char *type, int typelen,
                               char *buff, int buffsize);


5172 5173 5174 5175 5176 5177 5178
/*
  SHOW GRANTS;  Send grants for a user to the client

  IMPLEMENTATION
   Send to client grant-like strings depicting user@host privileges
*/

5179
bool mysql_show_grants(THD *thd,LEX_USER *lex_user)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5180
{
5181 5182
  ulong want_access;
  uint counter,index;
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bk@work.mysql.com committed
5183
  int  error = 0;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5184 5185
  ACL_USER *acl_user;
  ACL_DB *acl_db;
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bk@work.mysql.com committed
5186
  char buff[1024];
5187
  Protocol *protocol= thd->protocol;
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tonu@x153.internalnet committed
5188
  DBUG_ENTER("mysql_show_grants");
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5189 5190 5191 5192

  LINT_INIT(acl_user);
  if (!initialized)
  {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
5193
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
5194
    DBUG_RETURN(TRUE);
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bk@work.mysql.com committed
5195
  }
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monty@mysql.com committed
5196

Marc Alff's avatar
Marc Alff committed
5197 5198
  mysql_rwlock_rdlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
5199 5200 5201

  acl_user= find_acl_user(lex_user->host.str, lex_user->user.str, TRUE);
  if (!acl_user)
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bk@work.mysql.com committed
5202
  {
Marc Alff's avatar
Marc Alff committed
5203 5204
    mysql_mutex_unlock(&acl_cache->lock);
    mysql_rwlock_unlock(&LOCK_grant);
5205

guilhem@mysql.com's avatar
guilhem@mysql.com committed
5206 5207
    my_error(ER_NONEXISTING_GRANT, MYF(0),
             lex_user->user.str, lex_user->host.str);
5208
    DBUG_RETURN(TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5209 5210
  }

5211
  Item_string *field=new Item_string("",0,&my_charset_latin1);
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5212 5213 5214 5215 5216 5217
  List<Item> field_list;
  field->name=buff;
  field->max_length=1024;
  strxmov(buff,"Grants for ",lex_user->user.str,"@",
	  lex_user->host.str,NullS);
  field_list.push_back(field);
5218
  if (protocol->send_result_set_metadata(&field_list,
5219
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
5220
  {
Marc Alff's avatar
Marc Alff committed
5221 5222
    mysql_mutex_unlock(&acl_cache->lock);
    mysql_rwlock_unlock(&LOCK_grant);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5223

5224 5225
    DBUG_RETURN(TRUE);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5226 5227 5228

  /* Add first global access grants */
  {
5229
    String global(buff,sizeof(buff),system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5230
    global.length(0);
5231
    global.append(STRING_WITH_LEN("GRANT "));
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bk@work.mysql.com committed
5232

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5233
    want_access= acl_user->access;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5234
    if (test_all_bits(want_access, (GLOBAL_ACLS & ~ GRANT_ACL)))
5235
      global.append(STRING_WITH_LEN("ALL PRIVILEGES"));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5236
    else if (!(want_access & ~GRANT_ACL))
5237
      global.append(STRING_WITH_LEN("USAGE"));
peter@mysql.com's avatar
peter@mysql.com committed
5238
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5239 5240
    {
      bool found=0;
5241
      ulong j,test_access= want_access & ~GRANT_ACL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5242 5243
      for (counter=0, j = SELECT_ACL;j <= GLOBAL_ACLS;counter++,j <<= 1)
      {
peter@mysql.com's avatar
peter@mysql.com committed
5244
	if (test_access & j)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5245 5246
	{
	  if (found)
5247
	    global.append(STRING_WITH_LEN(", "));
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bk@work.mysql.com committed
5248 5249 5250 5251 5252
	  found=1;
	  global.append(command_array[counter],command_lengths[counter]);
	}
      }
    }
5253
    global.append (STRING_WITH_LEN(" ON *.* TO '"));
5254 5255
    global.append(lex_user->user.str, lex_user->user.length,
		  system_charset_info);
5256
    global.append (STRING_WITH_LEN("'@'"));
5257 5258
    global.append(lex_user->host.str,lex_user->host.length,
		  system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5259
    global.append ('\'');
5260
    if (acl_user->salt_len)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5261
    {
5262 5263 5264 5265 5266
      char passwd_buff[SCRAMBLED_PASSWORD_CHAR_LENGTH+1];
      if (acl_user->salt_len == SCRAMBLE_LENGTH)
        make_password_from_salt(passwd_buff, acl_user->salt);
      else
        make_password_from_salt_323(passwd_buff, (ulong *) acl_user->salt);
5267
      global.append(STRING_WITH_LEN(" IDENTIFIED BY PASSWORD '"));
5268
      global.append(passwd_buff);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5269 5270
      global.append('\'');
    }
5271 5272
    /* "show grants" SSL related stuff */
    if (acl_user->ssl_type == SSL_TYPE_ANY)
5273
      global.append(STRING_WITH_LEN(" REQUIRE SSL"));
5274
    else if (acl_user->ssl_type == SSL_TYPE_X509)
5275
      global.append(STRING_WITH_LEN(" REQUIRE X509"));
5276
    else if (acl_user->ssl_type == SSL_TYPE_SPECIFIED)
5277
    {
5278
      int ssl_options = 0;
5279
      global.append(STRING_WITH_LEN(" REQUIRE "));
5280 5281
      if (acl_user->x509_issuer)
      {
5282
	ssl_options++;
5283
	global.append(STRING_WITH_LEN("ISSUER \'"));
5284
	global.append(acl_user->x509_issuer,strlen(acl_user->x509_issuer));
5285
	global.append('\'');
5286
      }
5287 5288
      if (acl_user->x509_subject)
      {
5289 5290
	if (ssl_options++)
	  global.append(' ');
5291
	global.append(STRING_WITH_LEN("SUBJECT \'"));
5292 5293
	global.append(acl_user->x509_subject,strlen(acl_user->x509_subject),
                      system_charset_info);
5294
	global.append('\'');
tonu@x153.internalnet's avatar
tonu@x153.internalnet committed
5295
      }
5296 5297
      if (acl_user->ssl_cipher)
      {
5298 5299
	if (ssl_options++)
	  global.append(' ');
5300
	global.append(STRING_WITH_LEN("CIPHER '"));
5301 5302
	global.append(acl_user->ssl_cipher,strlen(acl_user->ssl_cipher),
                      system_charset_info);
5303
	global.append('\'');
5304 5305
      }
    }
5306
    if ((want_access & GRANT_ACL) ||
5307 5308 5309 5310
	(acl_user->user_resource.questions ||
         acl_user->user_resource.updates ||
         acl_user->user_resource.conn_per_hour ||
         acl_user->user_resource.user_conn))
5311
    {
5312
      global.append(STRING_WITH_LEN(" WITH"));
5313
      if (want_access & GRANT_ACL)
5314
	global.append(STRING_WITH_LEN(" GRANT OPTION"));
5315 5316 5317 5318
      add_user_option(&global, acl_user->user_resource.questions,
		      "MAX_QUERIES_PER_HOUR");
      add_user_option(&global, acl_user->user_resource.updates,
		      "MAX_UPDATES_PER_HOUR");
5319
      add_user_option(&global, acl_user->user_resource.conn_per_hour,
5320
		      "MAX_CONNECTIONS_PER_HOUR");
5321 5322
      add_user_option(&global, acl_user->user_resource.user_conn,
		      "MAX_USER_CONNECTIONS");
5323
    }
5324
    protocol->prepare_for_resend();
5325
    protocol->store(global.ptr(),global.length(),global.charset());
5326
    if (protocol->write())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5327
    {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5328
      error= -1;
5329
      goto end;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5330 5331 5332 5333 5334 5335
    }
  }

  /* Add database access */
  for (counter=0 ; counter < acl_dbs.elements ; counter++)
  {
monty@mysql.com's avatar
monty@mysql.com committed
5336
    const char *user, *host;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5337 5338 5339

    acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
    if (!(user=acl_db->user))
monty@mysql.com's avatar
monty@mysql.com committed
5340
      user= "";
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5341
    if (!(host=acl_db->host.hostname))
monty@mysql.com's avatar
monty@mysql.com committed
5342
      host= "";
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5343

5344 5345 5346 5347 5348 5349 5350
    /*
      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
      but make it case-insensitive because that's the way they are
      actually applied, and showing fewer privileges than are applied
      would be wrong from a security point of view.
    */

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5351
    if (!strcmp(lex_user->user.str,user) &&
5352
	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5353 5354
    {
      want_access=acl_db->access;
peter@mysql.com's avatar
peter@mysql.com committed
5355
      if (want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5356
      {
5357
	String db(buff,sizeof(buff),system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5358
	db.length(0);
5359
	db.append(STRING_WITH_LEN("GRANT "));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5360 5361

	if (test_all_bits(want_access,(DB_ACLS & ~GRANT_ACL)))
5362
	  db.append(STRING_WITH_LEN("ALL PRIVILEGES"));
5363
	else if (!(want_access & ~GRANT_ACL))
5364
	  db.append(STRING_WITH_LEN("USAGE"));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5365 5366 5367
	else
	{
	  int found=0, cnt;
5368
	  ulong j,test_access= want_access & ~GRANT_ACL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5369 5370 5371 5372 5373
	  for (cnt=0, j = SELECT_ACL; j <= DB_ACLS; cnt++,j <<= 1)
	  {
	    if (test_access & j)
	    {
	      if (found)
5374
		db.append(STRING_WITH_LEN(", "));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5375 5376 5377 5378 5379
	      found = 1;
	      db.append(command_array[cnt],command_lengths[cnt]);
	    }
	  }
	}
5380
	db.append (STRING_WITH_LEN(" ON "));
5381
	append_identifier(thd, &db, acl_db->db, strlen(acl_db->db));
5382
	db.append (STRING_WITH_LEN(".* TO '"));
5383 5384
	db.append(lex_user->user.str, lex_user->user.length,
		  system_charset_info);
5385
	db.append (STRING_WITH_LEN("'@'"));
5386 5387
	// host and lex_user->host are equal except for case
	db.append(host, strlen(host), system_charset_info);
peter@mysql.com's avatar
peter@mysql.com committed
5388
	db.append ('\'');
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5389
	if (want_access & GRANT_ACL)
5390
	  db.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
5391
	protocol->prepare_for_resend();
5392
	protocol->store(db.ptr(),db.length(),db.charset());
5393
	if (protocol->write())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5394
	{
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5395
	  error= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5396 5397 5398 5399 5400 5401
	  goto end;
	}
      }
    }
  }

5402
  /* Add table & column access */
5403
  for (index=0 ; index < column_priv_hash.records ; index++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5404
  {
5405
    const char *user, *host;
Konstantin Osipov's avatar
Konstantin Osipov committed
5406 5407
    GRANT_TABLE *grant_table= (GRANT_TABLE*)
      my_hash_element(&column_priv_hash, index);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5408 5409

    if (!(user=grant_table->user))
5410
      user= "";
5411 5412
    if (!(host= grant_table->host.hostname))
      host= "";
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5413

5414 5415 5416 5417 5418 5419 5420
    /*
      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
      but make it case-insensitive because that's the way they are
      actually applied, and showing fewer privileges than are applied
      would be wrong from a security point of view.
    */

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5421
    if (!strcmp(lex_user->user.str,user) &&
5422
	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5423
    {
5424 5425
      ulong table_access= grant_table->privs;
      if ((table_access | grant_table->cols) != 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5426
      {
5427
	String global(buff, sizeof(buff), system_charset_info);
5428 5429
	ulong test_access= (table_access | grant_table->cols) & ~GRANT_ACL;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5430
	global.length(0);
5431
	global.append(STRING_WITH_LEN("GRANT "));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5432

5433
	if (test_all_bits(table_access, (TABLE_ACLS & ~GRANT_ACL)))
5434
	  global.append(STRING_WITH_LEN("ALL PRIVILEGES"));
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5435
	else if (!test_access)
5436
	  global.append(STRING_WITH_LEN("USAGE"));
peter@mysql.com's avatar
peter@mysql.com committed
5437
	else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5438
	{
5439
          /* Add specific column access */
5440
	  int found= 0;
5441
	  ulong j;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5442

5443
	  for (counter= 0, j= SELECT_ACL; j <= TABLE_ACLS; counter++, j<<= 1)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5444
	  {
peter@mysql.com's avatar
peter@mysql.com committed
5445
	    if (test_access & j)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5446 5447
	    {
	      if (found)
5448
		global.append(STRING_WITH_LEN(", "));
5449
	      found= 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5450 5451
	      global.append(command_array[counter],command_lengths[counter]);

peter@mysql.com's avatar
peter@mysql.com committed
5452
	      if (grant_table->cols)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5453
	      {
5454
		uint found_col= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5455 5456 5457 5458 5459
		for (uint col_index=0 ;
		     col_index < grant_table->hash_columns.records ;
		     col_index++)
		{
		  GRANT_COLUMN *grant_column = (GRANT_COLUMN*)
Konstantin Osipov's avatar
Konstantin Osipov committed
5460
                    my_hash_element(&grant_table->hash_columns,col_index);
peter@mysql.com's avatar
peter@mysql.com committed
5461
		  if (grant_column->rights & j)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5462
		  {
peter@mysql.com's avatar
peter@mysql.com committed
5463
		    if (!found_col)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5464
		    {
5465 5466 5467 5468 5469 5470 5471
		      found_col= 1;
		      /*
			If we have a duplicated table level privilege, we
			must write the access privilege name again.
		      */
		      if (table_access & j)
		      {
5472
			global.append(STRING_WITH_LEN(", "));
5473 5474 5475
			global.append(command_array[counter],
				      command_lengths[counter]);
		      }
5476
		      global.append(STRING_WITH_LEN(" ("));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5477 5478
		    }
		    else
5479
		      global.append(STRING_WITH_LEN(", "));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5480
		    global.append(grant_column->column,
5481 5482
				  grant_column->key_length,
				  system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5483 5484 5485 5486 5487 5488 5489 5490
		  }
		}
		if (found_col)
		  global.append(')');
	      }
	    }
	  }
	}
5491
	global.append(STRING_WITH_LEN(" ON "));
5492 5493 5494 5495 5496
	append_identifier(thd, &global, grant_table->db,
			  strlen(grant_table->db));
	global.append('.');
	append_identifier(thd, &global, grant_table->tname,
			  strlen(grant_table->tname));
5497
	global.append(STRING_WITH_LEN(" TO '"));
5498 5499
	global.append(lex_user->user.str, lex_user->user.length,
		      system_charset_info);
5500
	global.append(STRING_WITH_LEN("'@'"));
5501 5502
	// host and lex_user->host are equal except for case
	global.append(host, strlen(host), system_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5503
	global.append('\'');
5504
	if (table_access & GRANT_ACL)
5505
	  global.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
5506
	protocol->prepare_for_resend();
5507
	protocol->store(global.ptr(),global.length(),global.charset());
5508
	if (protocol->write())
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5509
	{
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5510
	  error= -1;
5511
	  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5512 5513 5514 5515
	}
      }
    }
  }
5516

5517
  if (show_routine_grants(thd, lex_user, &proc_priv_hash, 
5518
                          STRING_WITH_LEN("PROCEDURE"), buff, sizeof(buff)))
5519 5520 5521 5522 5523 5524
  {
    error= -1;
    goto end;
  }

  if (show_routine_grants(thd, lex_user, &func_priv_hash,
5525
                          STRING_WITH_LEN("FUNCTION"), buff, sizeof(buff)))
5526 5527 5528 5529 5530
  {
    error= -1;
    goto end;
  }

5531 5532 5533 5534 5535 5536
  if (show_proxy_grants(thd, lex_user, buff, sizeof(buff)))
  {
    error= -1;
    goto end;
  }

5537
end:
Marc Alff's avatar
Marc Alff committed
5538 5539
  mysql_mutex_unlock(&acl_cache->lock);
  mysql_rwlock_unlock(&LOCK_grant);
5540

5541
  my_eof(thd);
5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553
  DBUG_RETURN(error);
}

static int show_routine_grants(THD* thd, LEX_USER *lex_user, HASH *hash,
                               const char *type, int typelen,
                               char *buff, int buffsize)
{
  uint counter, index;
  int error= 0;
  Protocol *protocol= thd->protocol;
  /* Add routine access */
  for (index=0 ; index < hash->records ; index++)
5554
  {
5555
    const char *user, *host;
Konstantin Osipov's avatar
Konstantin Osipov committed
5556
    GRANT_NAME *grant_proc= (GRANT_NAME*) my_hash_element(hash, index);
5557 5558 5559

    if (!(user=grant_proc->user))
      user= "";
5560 5561
    if (!(host= grant_proc->host.hostname))
      host= "";
5562

5563 5564 5565 5566 5567 5568 5569
    /*
      We do not make SHOW GRANTS case-sensitive here (like REVOKE),
      but make it case-insensitive because that's the way they are
      actually applied, and showing fewer privileges than are applied
      would be wrong from a security point of view.
    */

5570
    if (!strcmp(lex_user->user.str,user) &&
5571
	!my_strcasecmp(system_charset_info, lex_user->host.str, host))
5572 5573 5574 5575
    {
      ulong proc_access= grant_proc->privs;
      if (proc_access != 0)
      {
5576
	String global(buff, buffsize, system_charset_info);
5577 5578 5579
	ulong test_access= proc_access & ~GRANT_ACL;

	global.length(0);
5580
	global.append(STRING_WITH_LEN("GRANT "));
5581 5582

	if (!test_access)
5583
 	  global.append(STRING_WITH_LEN("USAGE"));
5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594
	else
	{
          /* Add specific procedure access */
	  int found= 0;
	  ulong j;

	  for (counter= 0, j= SELECT_ACL; j <= PROC_ACLS; counter++, j<<= 1)
	  {
	    if (test_access & j)
	    {
	      if (found)
5595
		global.append(STRING_WITH_LEN(", "));
5596 5597 5598 5599 5600
	      found= 1;
	      global.append(command_array[counter],command_lengths[counter]);
	    }
	  }
	}
5601
	global.append(STRING_WITH_LEN(" ON "));
5602 5603
        global.append(type,typelen);
        global.append(' ');
5604 5605 5606 5607 5608
	append_identifier(thd, &global, grant_proc->db,
			  strlen(grant_proc->db));
	global.append('.');
	append_identifier(thd, &global, grant_proc->tname,
			  strlen(grant_proc->tname));
5609
	global.append(STRING_WITH_LEN(" TO '"));
5610 5611
	global.append(lex_user->user.str, lex_user->user.length,
		      system_charset_info);
5612
	global.append(STRING_WITH_LEN("'@'"));
5613 5614
	// host and lex_user->host are equal except for case
	global.append(host, strlen(host), system_charset_info);
5615 5616
	global.append('\'');
	if (proc_access & GRANT_ACL)
5617
	  global.append(STRING_WITH_LEN(" WITH GRANT OPTION"));
5618 5619 5620 5621 5622 5623 5624 5625 5626 5627
	protocol->prepare_for_resend();
	protocol->store(global.ptr(),global.length(),global.charset());
	if (protocol->write())
	{
	  error= -1;
	  break;
	}
      }
    }
  }
5628
  return error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5629 5630
}

5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658
/*
  Make a clear-text version of the requested privilege.
*/

void get_privilege_desc(char *to, uint max_length, ulong access)
{
  uint pos;
  char *start=to;
  DBUG_ASSERT(max_length >= 30);		// For end ',' removal

  if (access)
  {
    max_length--;				// Reserve place for end-zero
    for (pos=0 ; access ; pos++, access>>=1)
    {
      if ((access & 1) &&
	  command_lengths[pos] + (uint) (to-start) < max_length)
      {
	to= strmov(to, command_array[pos]);
	*to++=',';
      }
    }
    to--;					// Remove end ','
  }
  *to=0;
}


5659
void get_mqh(const char *user, const char *host, USER_CONN *uc)
5660 5661
{
  ACL_USER *acl_user;
5662

Marc Alff's avatar
Marc Alff committed
5663
  mysql_mutex_lock(&acl_cache->lock);
5664

5665
  if (initialized && (acl_user= find_acl_user(host,user, FALSE)))
5666 5667 5668
    uc->user_resources= acl_user->user_resource;
  else
    bzero((char*) &uc->user_resources, sizeof(uc->user_resources));
5669

Marc Alff's avatar
Marc Alff committed
5670
  mysql_mutex_unlock(&acl_cache->lock);
5671 5672
}

5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693
/*
  Open the grant tables.

  SYNOPSIS
    open_grant_tables()
    thd                         The current thread.
    tables (out)                The 4 elements array for the opened tables.

  DESCRIPTION
    Tables are numbered as follows:
    0 user
    1 db
    2 tables_priv
    3 columns_priv

  RETURN
    1           Skip GRANT handling during replication.
    0           OK.
    < 0         Error.
*/

5694
#define GRANT_TABLES 6
5695 5696 5697 5698 5699 5700
int open_grant_tables(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("open_grant_tables");

  if (!initialized)
  {
5701
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
5702 5703 5704
    DBUG_RETURN(-1);
  }

5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717
  tables->init_one_table(C_STRING_WITH_LEN("mysql"),
                         C_STRING_WITH_LEN("user"), "user", TL_WRITE);
  (tables+1)->init_one_table(C_STRING_WITH_LEN("mysql"),
                             C_STRING_WITH_LEN("db"), "db", TL_WRITE);
  (tables+2)->init_one_table(C_STRING_WITH_LEN("mysql"),
                             C_STRING_WITH_LEN("tables_priv"),
                             "tables_priv", TL_WRITE);
  (tables+3)->init_one_table(C_STRING_WITH_LEN("mysql"),
                             C_STRING_WITH_LEN("columns_priv"),
                             "columns_priv", TL_WRITE);
  (tables+4)->init_one_table(C_STRING_WITH_LEN("mysql"),
                             C_STRING_WITH_LEN("procs_priv"),
                             "procs_priv", TL_WRITE);
5718
  (tables+5)->init_one_table(C_STRING_WITH_LEN("mysql"),
5719 5720
                             C_STRING_WITH_LEN("proxies_priv"),
                             "proxies_priv", TL_WRITE);
5721 5722
  tables[5].open_strategy= TABLE_LIST::OPEN_IF_EXISTS;

5723 5724 5725 5726 5727
  tables->next_local= tables->next_global= tables + 1;
  (tables+1)->next_local= (tables+1)->next_global= tables + 2;
  (tables+2)->next_local= (tables+2)->next_global= tables + 3;
  (tables+3)->next_local= (tables+3)->next_global= tables + 4;
  (tables+4)->next_local= (tables+4)->next_global= tables + 5;
5728 5729 5730 5731 5732 5733

#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
5734
  if (thd->slave_thread && rpl_filter->is_on())
5735
  {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5736 5737 5738
    /*
      The tables must be marked "updating" so that tables_ok() takes them into
      account in tests.
5739
    */
5740 5741
    tables[0].updating= tables[1].updating= tables[2].updating=
      tables[3].updating= tables[4].updating= tables[5].updating= 1;
lars@mysql.com's avatar
lars@mysql.com committed
5742
    if (!(thd->spcont || rpl_filter->tables_ok(0, tables)))
5743
      DBUG_RETURN(1);
5744 5745
    tables[0].updating= tables[1].updating= tables[2].updating=
      tables[3].updating= tables[4].updating= tables[5].updating= 0;
5746
  }
5747 5748
#endif

5749
  if (open_and_lock_tables(thd, tables, FALSE, MYSQL_LOCK_IGNORE_TIMEOUT))
5750 5751 5752 5753 5754 5755 5756 5757
  {						// This should never happen
    DBUG_RETURN(-1);
  }

  DBUG_RETURN(0);
}

ACL_USER *check_acl_user(LEX_USER *user_name,
monty@narttu.mysql.fi's avatar
merge  
monty@narttu.mysql.fi committed
5758
			 uint *acl_acl_userdx)
5759 5760 5761 5762
{
  ACL_USER *acl_user= 0;
  uint counter;

Marc Alff's avatar
Marc Alff committed
5763
  mysql_mutex_assert_owner(&acl_cache->lock);
5764

5765 5766 5767 5768 5769
  for (counter= 0 ; counter < acl_users.elements ; counter++)
  {
    const char *user,*host;
    acl_user= dynamic_element(&acl_users, counter, ACL_USER*);
    if (!(user=acl_user->user))
monty@mysql.com's avatar
monty@mysql.com committed
5770
      user= "";
5771
    if (!(host=acl_user->host.hostname))
5772
      host= "";
5773 5774 5775 5776 5777 5778 5779
    if (!strcmp(user_name->user.str,user) &&
	!my_strcasecmp(system_charset_info, user_name->host.str, host))
      break;
  }
  if (counter == acl_users.elements)
    return 0;

monty@narttu.mysql.fi's avatar
merge  
monty@narttu.mysql.fi committed
5780
  *acl_acl_userdx= counter;
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monty@mashka.mysql.fi committed
5781
  return acl_user;
5782
}
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monty@mashka.mysql.fi committed
5783

5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805
/*
  Modify a privilege table.

  SYNOPSIS
    modify_grant_table()
    table                       The table to modify.
    host_field                  The host name field.
    user_field                  The user name field.
    user_to                     The new name for the user if to be renamed,
                                NULL otherwise.

  DESCRIPTION
  Update user/host in the current record if user_to is not NULL.
  Delete the current record if user_to is NULL.

  RETURN
    0           OK.
    != 0        Error.
*/

static int modify_grant_table(TABLE *table, Field *host_field,
                              Field *user_field, LEX_USER *user_to)
5806
{
5807 5808
  int error;
  DBUG_ENTER("modify_grant_table");
5809

5810 5811 5812 5813 5814 5815 5816 5817
  if (user_to)
  {
    /* rename */
    store_record(table, record[1]);
    host_field->store(user_to->host.str, user_to->host.length,
                      system_charset_info);
    user_field->store(user_to->user.str, user_to->user.length,
                      system_charset_info);
5818 5819 5820
    if ((error= table->file->ha_update_row(table->record[1], 
                                           table->record[0])) &&
        error != HA_ERR_RECORD_IS_THE_SAME)
5821
      table->file->print_error(error, MYF(0));
5822 5823
    else
      error= 0;
5824 5825 5826 5827
  }
  else
  {
    /* delete */
5828
    if ((error=table->file->ha_delete_row(table->record[0])))
5829 5830
      table->file->print_error(error, MYF(0));
  }
5831

5832 5833
  DBUG_RETURN(error);
}
5834

5835 5836 5837 5838 5839 5840
/*
  Handle a privilege table.

  SYNOPSIS
    handle_grant_table()
    tables                      The array with the four open tables.
5841
    table_no                    The number of the table to handle (0..4).
5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858
    drop                        If user_from is to be dropped.
    user_from                   The the user to be searched/dropped/renamed.
    user_to                     The new name for the user if to be renamed,
                                NULL otherwise.

  DESCRIPTION
    Scan through all records in a grant table and apply the requested
    operation. For the "user" table, a single index access is sufficient,
    since there is an unique index on (host, user).
    Delete from grant table if drop is true.
    Update in grant table if drop is false and user_to is not NULL.
    Search in grant table if drop is false and user_to is NULL.
    Tables are numbered as follows:
    0 user
    1 db
    2 tables_priv
    3 columns_priv
5859
    4 procs_priv
5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873

  RETURN
    > 0         At least one record matched.
    0           OK, but no record matched.
    < 0         Error.
*/

static int handle_grant_table(TABLE_LIST *tables, uint table_no, bool drop,
                              LEX_USER *user_from, LEX_USER *user_to)
{
  int result= 0;
  int error;
  TABLE *table= tables[table_no].table;
  Field *host_field= table->field[0];
5874
  Field *user_field= table->field[table_no && table_no != 5 ? 2 : 1];
5875 5876 5877 5878
  char *host_str= user_from->host.str;
  char *user_str= user_from->user.str;
  const char *host;
  const char *user;
5879
  uchar user_key[MAX_KEY_LENGTH];
5880
  uint key_prefix_length;
5881
  DBUG_ENTER("handle_grant_table");
5882
  THD *thd= current_thd;
5883

5884
  table->use_all_columns();
5885
  if (! table_no) // mysql.user table
5886
  {
5887 5888 5889 5890 5891 5892 5893 5894 5895 5896
    /*
      The 'user' table has an unique index on (host, user).
      Thus, we can handle everything with a single index access.
      The host- and user fields are consecutive in the user table records.
      So we set host- and user fields of table->record[0] and use the
      pointer to the host field as key.
      index_read_idx() will replace table->record[0] (its first argument)
      by the searched record, if it exists.
    */
    DBUG_PRINT("info",("read table: '%s'  search: '%s'@'%s'",
5897
                       table->s->table_name.str, user_str, host_str));
5898 5899
    host_field->store(host_str, user_from->host.length, system_charset_info);
    user_field->store(user_str, user_from->user.length, system_charset_info);
5900 5901 5902 5903 5904

    key_prefix_length= (table->key_info->key_part[0].store_length +
                        table->key_info->key_part[1].store_length);
    key_copy(user_key, table->record[0], table->key_info, key_prefix_length);

5905 5906 5907
    if ((error= table->file->index_read_idx_map(table->record[0], 0,
                                                user_key, (key_part_map)3,
                                                HA_READ_KEY_EXACT)))
5908
    {
5909
      if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
5910 5911 5912 5913
      {
        table->file->print_error(error, MYF(0));
        result= -1;
      }
5914
    }
5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931
    else
    {
      /* If requested, delete or update the record. */
      result= ((drop || user_to) &&
               modify_grant_table(table, host_field, user_field, user_to)) ?
        -1 : 1; /* Error or found. */
    }
    DBUG_PRINT("info",("read result: %d", result));
  }
  else
  {
    /*
      The non-'user' table do not have indexes on (host, user).
      And their host- and user fields are not consecutive.
      Thus, we need to do a table scan to find all matching records.
    */
    if ((error= table->file->ha_rnd_init(1)))
5932
    {
5933
      table->file->print_error(error, MYF(0));
5934
      result= -1;
5935 5936 5937 5938 5939
    }
    else
    {
#ifdef EXTRA_DEBUG
      DBUG_PRINT("info",("scan table: '%s'  search: '%s'@'%s'",
5940
                         table->s->table_name.str, user_str, host_str));
5941 5942 5943 5944 5945 5946 5947 5948 5949 5950
#endif
      while ((error= table->file->rnd_next(table->record[0])) != 
             HA_ERR_END_OF_FILE)
      {
        if (error)
        {
          /* Most probable 'deleted record'. */
          DBUG_PRINT("info",("scan error: %d", error));
          continue;
        }
5951
        if (! (host= get_field(thd->mem_root, host_field)))
5952
          host= "";
5953
        if (! (user= get_field(thd->mem_root, user_field)))
5954 5955 5956
          user= "";

#ifdef EXTRA_DEBUG
5957 5958 5959 5960 5961 5962 5963 5964 5965
        if (table_no != 5)
        {
          DBUG_PRINT("loop",("scan fields: '%s'@'%s' '%s' '%s' '%s'",
                             user, host,
                             get_field(thd->mem_root, table->field[1]) /*db*/,
                             get_field(thd->mem_root, table->field[3]) /*table*/,
                             get_field(thd->mem_root,
                                       table->field[4]) /*column*/));
        }
5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987
#endif
        if (strcmp(user_str, user) ||
            my_strcasecmp(system_charset_info, host_str, host))
          continue;

        /* If requested, delete or update the record. */
        result= ((drop || user_to) &&
                 modify_grant_table(table, host_field, user_field, user_to)) ?
          -1 : result ? result : 1; /* Error or keep result or found. */
        /* If search is requested, we do not need to search further. */
        if (! drop && ! user_to)
          break ;
      }
      (void) table->file->ha_rnd_end();
      DBUG_PRINT("info",("scan result: %d", result));
    }
  }

  DBUG_RETURN(result);
}


5988
/**
5989 5990
  Handle an in-memory privilege structure.

Georgi Kodinov's avatar
Georgi Kodinov committed
5991
  @param struct_no  The number of the structure to handle (0..5).
5992 5993 5994
  @param drop       If user_from is to be dropped.
  @param user_from  The the user to be searched/dropped/renamed.
  @param user_to    The new name for the user if to be renamed, NULL otherwise.
5995

5996
  @note
5997 5998 5999 6000 6001 6002 6003 6004 6005
    Scan through all elements in an in-memory grant structure and apply
    the requested operation.
    Delete from grant structure if drop is true.
    Update in grant structure if drop is false and user_to is not NULL.
    Search in grant structure if drop is false and user_to is NULL.
    Structures are numbered as follows:
    0 acl_users
    1 acl_dbs
    2 column_priv_hash
6006 6007
    3 proc_priv_hash
    4 func_priv_hash
Georgi Kodinov's avatar
Georgi Kodinov committed
6008
    5 acl_proxy_users
6009

6010 6011 6012
  @retval > 0  At least one element matched.
  @retval 0    OK, but no element matched.
  @retval -1   Wrong arguments to function.
6013 6014 6015 6016 6017 6018 6019 6020 6021 6022
*/

static int handle_grant_struct(uint struct_no, bool drop,
                               LEX_USER *user_from, LEX_USER *user_to)
{
  int result= 0;
  uint idx;
  uint elements;
  const char *user;
  const char *host;
Staale Smedseng's avatar
Staale Smedseng committed
6023 6024
  ACL_USER *acl_user= NULL;
  ACL_DB *acl_db= NULL;
6025
  ACL_PROXY_USER *acl_proxy_user= NULL;
Staale Smedseng's avatar
Staale Smedseng committed
6026
  GRANT_NAME *grant_name= NULL;
6027
  HASH *grant_name_hash= NULL;
6028
  DBUG_ENTER("handle_grant_struct");
monty@mishka.local's avatar
monty@mishka.local committed
6029 6030 6031
  DBUG_PRINT("info",("scan struct: %u  search: '%s'@'%s'",
                     struct_no, user_from->user.str, user_from->host.str));

6032 6033
  LINT_INIT(user);
  LINT_INIT(host);
6034

Marc Alff's avatar
Marc Alff committed
6035
  mysql_mutex_assert_owner(&acl_cache->lock);
6036

6037
  /* Get the number of elements in the in-memory structure. */
6038
  switch (struct_no) {
6039 6040 6041 6042 6043 6044
  case 0:
    elements= acl_users.elements;
    break;
  case 1:
    elements= acl_dbs.elements;
    break;
6045
  case 2:
6046
    elements= column_priv_hash.records;
6047
    grant_name_hash= &column_priv_hash;
6048 6049 6050
    break;
  case 3:
    elements= proc_priv_hash.records;
6051 6052 6053 6054 6055
    grant_name_hash= &proc_priv_hash;
    break;
  case 4:
    elements= func_priv_hash.records;
    grant_name_hash= &func_priv_hash;
6056
    break;
6057 6058 6059
  case 5:
    elements= acl_proxy_users.elements;
    break;
6060 6061
  default:
    return -1;
6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073
  }

#ifdef EXTRA_DEBUG
    DBUG_PRINT("loop",("scan struct: %u  search    user: '%s'  host: '%s'",
                       struct_no, user_from->user.str, user_from->host.str));
#endif
  /* Loop over all elements. */
  for (idx= 0; idx < elements; idx++)
  {
    /*
      Get a pointer to the element.
    */
6074
    switch (struct_no) {
6075 6076 6077
    case 0:
      acl_user= dynamic_element(&acl_users, idx, ACL_USER*);
      user= acl_user->user;
6078 6079
      host= acl_user->host.hostname;
    break;
6080 6081 6082 6083

    case 1:
      acl_db= dynamic_element(&acl_dbs, idx, ACL_DB*);
      user= acl_db->user;
6084
      host= acl_db->host.hostname;
6085 6086
      break;

6087 6088
    case 2:
    case 3:
6089
    case 4:
Georgi Kodinov's avatar
Georgi Kodinov committed
6090
      grant_name= (GRANT_NAME*) my_hash_element(grant_name_hash, idx);
6091
      user= grant_name->user;
6092
      host= grant_name->host.hostname;
6093
      break;
6094

6095
    case 5:
6096
      acl_proxy_user= dynamic_element(&acl_proxy_users, idx, ACL_PROXY_USER*);
6097 6098 6099
      user= acl_proxy_user->get_user();
      host= acl_proxy_user->get_host();
      break;
Georgi Kodinov's avatar
Georgi Kodinov committed
6100

6101
    default:
6102
      MY_ASSERT_UNREACHABLE();
6103 6104
    }
    if (! user)
6105
      user= "";
6106 6107 6108
    if (! host)
      host= "";

6109 6110 6111 6112 6113 6114
#ifdef EXTRA_DEBUG
    DBUG_PRINT("loop",("scan struct: %u  index: %u  user: '%s'  host: '%s'",
                       struct_no, idx, user, host));
#endif
    if (strcmp(user_from->user.str, user) ||
        my_strcasecmp(system_charset_info, user_from->host.str, host))
6115
      continue;
6116 6117 6118 6119

    result= 1; /* At least one element found. */
    if ( drop )
    {
6120
      switch ( struct_no ) {
6121 6122 6123 6124 6125 6126 6127 6128
      case 0:
        delete_dynamic_element(&acl_users, idx);
        break;

      case 1:
        delete_dynamic_element(&acl_dbs, idx);
        break;

6129 6130
      case 2:
      case 3:
6131
      case 4:
Georgi Kodinov's avatar
Georgi Kodinov committed
6132
        my_hash_delete(grant_name_hash, (uchar*) grant_name);
6133
	break;
6134 6135 6136 6137 6138

      case 5:
        delete_dynamic_element(&acl_proxy_users, idx);
        break;

6139 6140
      }
      elements--;
6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153
      /*
        - If we are iterating through an array then we just have moved all
          elements after the current element one position closer to its head.
          This means that we have to take another look at the element at
          current position as it is a new element from the array's tail.
        - If we are iterating through a hash the current element was replaced
          with one of elements from the tail. So we also have to take a look
          at the new element in current position.
          Note that in our HASH implementation hash_delete() won't move any
          elements with position after current one to position before the
          current (i.e. from the tail to the head), so it is safe to continue
          iteration without re-starting.
      */
6154
      idx--;
6155
    }
6156 6157
    else if ( user_to )
    {
6158
      switch ( struct_no ) {
6159 6160 6161 6162
      case 0:
        acl_user->user= strdup_root(&mem, user_to->user.str);
        acl_user->host.hostname= strdup_root(&mem, user_to->host.str);
        break;
6163

6164 6165 6166 6167 6168
      case 1:
        acl_db->user= strdup_root(&mem, user_to->user.str);
        acl_db->host.hostname= strdup_root(&mem, user_to->host.str);
        break;

6169 6170
      case 2:
      case 3:
6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191
      case 4:
        {
          /*
            Save old hash key and its length to be able properly update
            element position in hash.
          */
          char *old_key= grant_name->hash_key;
          size_t old_key_length= grant_name->key_length;

          /*
            Update the grant structure with the new user name and host name.
          */
          grant_name->set_user_details(user_to->host.str, grant_name->db,
                                       user_to->user.str, grant_name->tname,
                                       TRUE);

          /*
            Since username is part of the hash key, when the user name
            is renamed, the hash key is changed. Update the hash to
            ensure that the position matches the new hash key value
          */
Georgi Kodinov's avatar
Georgi Kodinov committed
6192 6193
          my_hash_update(grant_name_hash, (uchar*) grant_name, (uchar*) old_key,
                         old_key_length);
6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205
          /*
            hash_update() operation could have moved element from the tail
            of the hash to the current position. So we need to take a look
            at the element in current position once again.
            Thanks to the fact that hash_update() for our HASH implementation
            won't move any elements from the tail of the hash to the positions
            before the current one (a.k.a. head) it is safe to continue
            iteration without restarting.
          */
          idx--;
          break;
        }
6206 6207 6208 6209 6210 6211

      case 5:
        acl_proxy_user->set_user (&mem, user_to->user.str);
        acl_proxy_user->set_host (&mem, user_to->host.str);
        break;

6212 6213 6214
      }
    }
    else
6215
    {
6216 6217 6218 6219 6220 6221 6222
      /* If search is requested, we do not need to search further. */
      break;
    }
  }
#ifdef EXTRA_DEBUG
  DBUG_PRINT("loop",("scan struct: %u  result %d", struct_no, result));
#endif
6223

6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267
  DBUG_RETURN(result);
}


/*
  Handle all privilege tables and in-memory privilege structures.

  SYNOPSIS
    handle_grant_data()
    tables                      The array with the four open tables.
    drop                        If user_from is to be dropped.
    user_from                   The the user to be searched/dropped/renamed.
    user_to                     The new name for the user if to be renamed,
                                NULL otherwise.

  DESCRIPTION
    Go through all grant tables and in-memory grant structures and apply
    the requested operation.
    Delete from grant data if drop is true.
    Update in grant data if drop is false and user_to is not NULL.
    Search in grant data if drop is false and user_to is NULL.

  RETURN
    > 0         At least one element matched.
    0           OK, but no element matched.
    < 0         Error.
*/

static int handle_grant_data(TABLE_LIST *tables, bool drop,
                             LEX_USER *user_from, LEX_USER *user_to)
{
  int result= 0;
  int found;
  DBUG_ENTER("handle_grant_data");

  /* Handle user table. */
  if ((found= handle_grant_table(tables, 0, drop, user_from, user_to)) < 0)
  {
    /* Handle of table failed, don't touch the in-memory array. */
    result= -1;
  }
  else
  {
    /* Handle user array. */
6268 6269
    if ((handle_grant_struct(0, drop, user_from, user_to) && ! result) ||
        found)
6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296
    {
      result= 1; /* At least one record/element found. */
      /* If search is requested, we do not need to search further. */
      if (! drop && ! user_to)
        goto end;
    }
  }

  /* Handle db table. */
  if ((found= handle_grant_table(tables, 1, drop, user_from, user_to)) < 0)
  {
    /* Handle of table failed, don't touch the in-memory array. */
    result= -1;
  }
  else
  {
    /* Handle db array. */
    if (((handle_grant_struct(1, drop, user_from, user_to) && ! result) ||
         found) && ! result)
    {
      result= 1; /* At least one record/element found. */
      /* If search is requested, we do not need to search further. */
      if (! drop && ! user_to)
        goto end;
    }
  }

6297
  /* Handle stored routines table. */
6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313
  if ((found= handle_grant_table(tables, 4, drop, user_from, user_to)) < 0)
  {
    /* Handle of table failed, don't touch in-memory array. */
    result= -1;
  }
  else
  {
    /* Handle procs array. */
    if (((handle_grant_struct(3, drop, user_from, user_to) && ! result) ||
         found) && ! result)
    {
      result= 1; /* At least one record/element found. */
      /* If search is requested, we do not need to search further. */
      if (! drop && ! user_to)
        goto end;
    }
6314 6315 6316 6317 6318 6319
    /* Handle funcs array. */
    if (((handle_grant_struct(4, drop, user_from, user_to) && ! result) ||
         found) && ! result)
    {
      result= 1; /* At least one record/element found. */
      /* If search is requested, we do not need to search further. */
6320 6321 6322 6323 6324
      if (! drop && ! user_to)
        goto end;
    }
  }

6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338
  /* Handle tables table. */
  if ((found= handle_grant_table(tables, 2, drop, user_from, user_to)) < 0)
  {
    /* Handle of table failed, don't touch columns and in-memory array. */
    result= -1;
  }
  else
  {
    if (found && ! result)
    {
      result= 1; /* At least one record found. */
      /* If search is requested, we do not need to search further. */
      if (! drop && ! user_to)
        goto end;
6339
    }
6340 6341 6342

    /* Handle columns table. */
    if ((found= handle_grant_table(tables, 3, drop, user_from, user_to)) < 0)
6343
    {
6344
      /* Handle of table failed, don't touch the in-memory array. */
6345 6346
      result= -1;
    }
6347 6348 6349 6350 6351 6352 6353 6354
    else
    {
      /* Handle columns hash. */
      if (((handle_grant_struct(2, drop, user_from, user_to) && ! result) ||
           found) && ! result)
        result= 1; /* At least one record/element found. */
    }
  }
6355

6356
  /* Handle proxies_priv table. */
6357
  if (tables[5].table)
6358
  {
6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370
    if ((found= handle_grant_table(tables, 5, drop, user_from, user_to)) < 0)
    {
      /* Handle of table failed, don't touch the in-memory array. */
      result= -1;
    }
    else
    {
      /* Handle proxies_priv array. */
      if ((handle_grant_struct(5, drop, user_from, user_to) && !result) ||
          found)
        result= 1; /* At least one record/element found. */
    }
6371
  }
6372 6373 6374 6375
 end:
  DBUG_RETURN(result);
}

6376

6377 6378 6379 6380 6381 6382
static void append_user(String *str, LEX_USER *user)
{
  if (str->length())
    str->append(',');
  str->append('\'');
  str->append(user->user.str);
6383
  str->append(STRING_WITH_LEN("'@'"));
6384 6385 6386
  str->append(user->host.str);
  str->append('\'');
}
6387

6388

6389 6390 6391 6392 6393 6394 6395
/*
  Create a list of users.

  SYNOPSIS
    mysql_create_user()
    thd                         The current thread.
    list                        The users to create.
6396

6397 6398 6399 6400 6401 6402 6403 6404
  RETURN
    FALSE       OK.
    TRUE        Error.
*/

bool mysql_create_user(THD *thd, List <LEX_USER> &list)
{
  int result;
6405
  String wrong_users;
6406
  LEX_USER *user_name, *tmp_user_name;
6407
  List_iterator <LEX_USER> user_list(list);
6408
  TABLE_LIST tables[GRANT_TABLES];
6409
  bool some_users_created= FALSE;
6410
  bool save_binlog_row_based;
6411 6412
  DBUG_ENTER("mysql_create_user");

6413 6414 6415 6416 6417
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
6418 6419
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
6420

6421 6422
  /* CREATE USER may be skipped on replication client. */
  if ((result= open_grant_tables(thd, tables)))
6423 6424
  {
    /* Restore the state of binlog format */
6425
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6426 6427
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
6428
    DBUG_RETURN(result != 1);
6429
  }
6430

Marc Alff's avatar
Marc Alff committed
6431 6432
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
6433

6434
  while ((tmp_user_name= user_list++))
6435
  {
6436 6437 6438 6439
    if (!(user_name= get_current_user(thd, tmp_user_name)))
    {
      result= TRUE;
      continue;
6440 6441
    }

6442 6443 6444 6445
    /*
      Search all in-memory structures and grant tables
      for a mention of the new user name.
    */
6446
    if (handle_grant_data(tables, 0, user_name, NULL))
6447
    {
6448
      append_user(&wrong_users, user_name);
6449
      result= TRUE;
6450
      continue;
6451
    }
6452

6453
    some_users_created= TRUE;
serg@serg.mylan's avatar
serg@serg.mylan committed
6454
    if (replace_user_table(thd, tables[0].table, *user_name, 0, 0, 1, 0))
6455
    {
6456
      append_user(&wrong_users, user_name);
6457 6458 6459 6460
      result= TRUE;
    }
  }

Marc Alff's avatar
Marc Alff committed
6461
  mysql_mutex_unlock(&acl_cache->lock);
6462

6463 6464 6465
  if (result)
    my_error(ER_CANNOT_USER, MYF(0), "CREATE USER", wrong_users.c_ptr_safe());

6466
  if (some_users_created)
6467
    result |= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
6468

Marc Alff's avatar
Marc Alff committed
6469
  mysql_rwlock_unlock(&LOCK_grant);
6470
  /* Restore the state of binlog format */
6471
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6472 6473
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493
  DBUG_RETURN(result);
}


/*
  Drop a list of users and all their privileges.

  SYNOPSIS
    mysql_drop_user()
    thd                         The current thread.
    list                        The users to drop.

  RETURN
    FALSE       OK.
    TRUE        Error.
*/

bool mysql_drop_user(THD *thd, List <LEX_USER> &list)
{
  int result;
6494
  String wrong_users;
6495
  LEX_USER *user_name, *tmp_user_name;
6496
  List_iterator <LEX_USER> user_list(list);
6497
  TABLE_LIST tables[GRANT_TABLES];
6498
  bool some_users_deleted= FALSE;
6499
  ulong old_sql_mode= thd->variables.sql_mode;
6500
  bool save_binlog_row_based;
6501 6502
  DBUG_ENTER("mysql_drop_user");

6503 6504 6505 6506 6507
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
6508 6509
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
6510

6511
  /* DROP USER may be skipped on replication client. */
6512
  if ((result= open_grant_tables(thd, tables)))
6513 6514
  {
    /* Restore the state of binlog format */
6515
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6516 6517
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
6518
    DBUG_RETURN(result != 1);
6519
  }
6520

6521 6522
  thd->variables.sql_mode&= ~MODE_PAD_CHAR_TO_FULL_LENGTH;

Marc Alff's avatar
Marc Alff committed
6523 6524
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
6525

6526
  while ((tmp_user_name= user_list++))
6527
  {
6528 6529 6530 6531 6532
    if (!(user_name= get_current_user(thd, tmp_user_name)))
    {
      result= TRUE;
      continue;
    }  
6533
    if (handle_grant_data(tables, 1, user_name, NULL) <= 0)
6534
    {
6535
      append_user(&wrong_users, user_name);
6536
      result= TRUE;
6537
      continue;
6538
    }
6539
    some_users_deleted= TRUE;
6540
  }
6541

6542 6543 6544
  /* Rebuild 'acl_check_hosts' since 'acl_users' has been modified */
  rebuild_check_host();

Marc Alff's avatar
Marc Alff committed
6545
  mysql_mutex_unlock(&acl_cache->lock);
6546

6547 6548 6549
  if (result)
    my_error(ER_CANNOT_USER, MYF(0), "DROP USER", wrong_users.c_ptr_safe());

6550
  if (some_users_deleted)
6551
    result |= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
6552

Marc Alff's avatar
Marc Alff committed
6553
  mysql_rwlock_unlock(&LOCK_grant);
6554
  thd->variables.sql_mode= old_sql_mode;
6555
  /* Restore the state of binlog format */
6556
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6557 6558
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577
  DBUG_RETURN(result);
}


/*
  Rename a user.

  SYNOPSIS
    mysql_rename_user()
    thd                         The current thread.
    list                        The user name pairs: (from, to).

  RETURN
    FALSE       OK.
    TRUE        Error.
*/

bool mysql_rename_user(THD *thd, List <LEX_USER> &list)
{
6578
  int result;
6579
  String wrong_users;
6580 6581
  LEX_USER *user_from, *tmp_user_from;
  LEX_USER *user_to, *tmp_user_to;
6582
  List_iterator <LEX_USER> user_list(list);
6583
  TABLE_LIST tables[GRANT_TABLES];
6584
  bool some_users_renamed= FALSE;
6585
  bool save_binlog_row_based;
6586 6587
  DBUG_ENTER("mysql_rename_user");

6588 6589 6590 6591 6592
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
6593 6594
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
6595

6596
  /* RENAME USER may be skipped on replication client. */
6597
  if ((result= open_grant_tables(thd, tables)))
6598 6599
  {
    /* Restore the state of binlog format */
6600
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6601 6602
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
6603
    DBUG_RETURN(result != 1);
6604
  }
6605

Marc Alff's avatar
Marc Alff committed
6606 6607
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
6608

6609
  while ((tmp_user_from= user_list++))
6610
  {
6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621
    if (!(user_from= get_current_user(thd, tmp_user_from)))
    {
      result= TRUE;
      continue;
    }  
    tmp_user_to= user_list++;
    if (!(user_to= get_current_user(thd, tmp_user_to)))
    {
      result= TRUE;
      continue;
    }  
6622
    DBUG_ASSERT(user_to != 0); /* Syntax enforces pairs of users. */
6623 6624 6625 6626 6627

    /*
      Search all in-memory structures and grant tables
      for a mention of the new user name.
    */
6628 6629
    if (handle_grant_data(tables, 0, user_to, NULL) ||
        handle_grant_data(tables, 0, user_from, user_to) <= 0)
6630
    {
6631
      append_user(&wrong_users, user_from);
6632
      result= TRUE;
6633
      continue;
6634
    }
6635
    some_users_renamed= TRUE;
6636
  }
6637
  
6638 6639 6640
  /* Rebuild 'acl_check_hosts' since 'acl_users' has been modified */
  rebuild_check_host();

Marc Alff's avatar
Marc Alff committed
6641
  mysql_mutex_unlock(&acl_cache->lock);
6642

6643 6644 6645 6646
  if (result)
    my_error(ER_CANNOT_USER, MYF(0), "RENAME USER", wrong_users.c_ptr_safe());
  
  if (some_users_renamed && mysql_bin_log.is_open())
6647
    result |= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
6648

Marc Alff's avatar
Marc Alff committed
6649
  mysql_rwlock_unlock(&LOCK_grant);
6650
  /* Restore the state of binlog format */
6651
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6652 6653
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
6654 6655 6656
  DBUG_RETURN(result);
}

6657

6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671
/*
  Revoke all privileges from a list of users.

  SYNOPSIS
    mysql_revoke_all()
    thd                         The current thread.
    list                        The users to revoke all privileges from.

  RETURN
    > 0         Error. Error message already sent.
    0           OK.
    < 0         Error. Error message not yet sent.
*/

6672
bool mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
6673
{
6674
  uint counter, revoked, is_proc;
6675
  int result;
6676
  ACL_DB *acl_db;
6677
  TABLE_LIST tables[GRANT_TABLES];
6678
  bool save_binlog_row_based;
6679 6680
  DBUG_ENTER("mysql_revoke_all");

6681 6682 6683 6684 6685
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
6686 6687
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
6688

6689
  if ((result= open_grant_tables(thd, tables)))
6690 6691
  {
    /* Restore the state of binlog format */
6692
    DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6693 6694
    if (save_binlog_row_based)
      thd->set_current_stmt_binlog_format_row();
6695
    DBUG_RETURN(result != 1);
6696
  }
6697

Marc Alff's avatar
Marc Alff committed
6698 6699
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
6700

6701
  LEX_USER *lex_user, *tmp_lex_user;
6702
  List_iterator <LEX_USER> user_list(list);
6703
  while ((tmp_lex_user= user_list++))
6704
  {
6705 6706 6707 6708 6709
    if (!(lex_user= get_current_user(thd, tmp_lex_user)))
    {
      result= -1;
      continue;
    }  
6710
    if (!find_acl_user(lex_user->host.str, lex_user->user.str, TRUE))
6711 6712 6713 6714
    {
      result= -1;
      continue;
    }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6715

6716
    if (replace_user_table(thd, tables[0].table,
6717
			   *lex_user, ~(ulong)0, 1, 0, 0))
6718 6719 6720 6721 6722 6723
    {
      result= -1;
      continue;
    }

    /* Remove db access privileges */
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6724 6725 6726 6727 6728
    /*
      Because acl_dbs and column_priv_hash shrink and may re-order
      as privileges are removed, removal occurs in a repeated loop
      until no more privileges are revoked.
     */
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6729
    do
6730
    {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6731
      for (counter= 0, revoked= 0 ; counter < acl_dbs.elements ; )
6732
      {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6733
	const char *user,*host;
6734

dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6735 6736 6737 6738 6739
	acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
	if (!(user=acl_db->user))
	  user= "";
	if (!(host=acl_db->host.hostname))
	  host= "";
6740

dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6741
	if (!strcmp(lex_user->user.str,user) &&
6742
            !strcmp(lex_user->host.str, host))
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6743
	{
6744 6745
	  if (!replace_db_table(tables[1].table, acl_db->db, *lex_user,
                                ~(ulong)0, 1))
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6746
	  {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6747 6748 6749 6750 6751
	    /*
	      Don't increment counter as replace_db_table deleted the
	      current element in acl_dbs.
	     */
	    revoked= 1;
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6752 6753
	    continue;
	  }
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6754
	  result= -1; // Something went wrong
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6755
	}
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6756
	counter++;
6757
      }
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6758
    } while (revoked);
6759 6760

    /* Remove column access */
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6761
    do
6762
    {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6763
      for (counter= 0, revoked= 0 ; counter < column_priv_hash.records ; )
6764
      {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6765
	const char *user,*host;
Konstantin Osipov's avatar
Konstantin Osipov committed
6766 6767
        GRANT_TABLE *grant_table=
          (GRANT_TABLE*) my_hash_element(&column_priv_hash, counter);
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6768 6769
	if (!(user=grant_table->user))
	  user= "";
6770
	if (!(host=grant_table->host.hostname))
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6771
	  host= "";
6772

dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6773
	if (!strcmp(lex_user->user.str,user) &&
6774
            !strcmp(lex_user->host.str, host))
6775
	{
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6776 6777 6778
	  if (replace_table_table(thd,grant_table,tables[2].table,*lex_user,
				  grant_table->db,
				  grant_table->tname,
6779
				  ~(ulong)0, 0, 1))
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6780
	  {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6781
	    result= -1;
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6782
	  }
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6783
	  else
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6784
	  {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6785
	    if (!grant_table->cols)
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6786
	    {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6787 6788
	      revoked= 1;
	      continue;
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6789
	    }
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6790 6791
	    List<LEX_COLUMN> columns;
	    if (!replace_column_table(grant_table,tables[3].table, *lex_user,
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6792 6793 6794
				      columns,
				      grant_table->db,
				      grant_table->tname,
6795
				      ~(ulong)0, 1))
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6796
	    {
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6797
	      revoked= 1;
6798
	      continue;
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6799
	    }
6800
	    result= -1;
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6801
	  }
6802
	}
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6803
	counter++;
6804
      }
dellis@goetia.(none)'s avatar
dellis@goetia.(none) committed
6805
    } while (revoked);
6806 6807

    /* Remove procedure access */
6808 6809 6810
    for (is_proc=0; is_proc<2; is_proc++) do {
      HASH *hash= is_proc ? &proc_priv_hash : &func_priv_hash;
      for (counter= 0, revoked= 0 ; counter < hash->records ; )
6811 6812
      {
	const char *user,*host;
Konstantin Osipov's avatar
Konstantin Osipov committed
6813
        GRANT_NAME *grant_proc= (GRANT_NAME*) my_hash_element(hash, counter);
6814 6815
	if (!(user=grant_proc->user))
	  user= "";
6816
	if (!(host=grant_proc->host.hostname))
6817 6818 6819
	  host= "";

	if (!strcmp(lex_user->user.str,user) &&
6820
            !strcmp(lex_user->host.str, host))
6821
	{
6822
	  if (replace_routine_table(thd,grant_proc,tables[4].table,*lex_user,
6823 6824
				  grant_proc->db,
				  grant_proc->tname,
6825
                                  is_proc,
6826
				  ~(ulong)0, 1) == 0)
6827 6828 6829 6830 6831 6832 6833 6834 6835
	  {
	    revoked= 1;
	    continue;
	  }
	  result= -1;	// Something went wrong
	}
	counter++;
      }
    } while (revoked);
6836
  }
6837

Marc Alff's avatar
Marc Alff committed
6838
  mysql_mutex_unlock(&acl_cache->lock);
6839

6840 6841 6842 6843
  if (result)
    my_message(ER_REVOKE_GRANTS, ER(ER_REVOKE_GRANTS), MYF(0));

  result= result |
6844
    write_bin_log(thd, FALSE, thd->query(), thd->query_length());
6845

Marc Alff's avatar
Marc Alff committed
6846
  mysql_rwlock_unlock(&LOCK_grant);
6847
  /* Restore the state of binlog format */
6848
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6849 6850
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
6851

6852
  DBUG_RETURN(result);
6853
}
6854

6855

6856

6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872 6873 6874 6875

/**
  If the defining user for a routine does not exist, then the ACL lookup
  code should raise two errors which we should intercept.  We convert the more
  descriptive error into a warning, and consume the other.

  If any other errors are raised, then we set a flag that should indicate
  that there was some failure we should complain at a higher level.
*/
class Silence_routine_definer_errors : public Internal_error_handler
{
public:
  Silence_routine_definer_errors()
    : is_grave(FALSE)
  {}

  virtual ~Silence_routine_definer_errors()
  {}

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6876 6877 6878 6879 6880 6881
  virtual bool handle_condition(THD *thd,
                                uint sql_errno,
                                const char* sqlstate,
                                MYSQL_ERROR::enum_warning_level level,
                                const char* msg,
                                MYSQL_ERROR ** cond_hdl);
6882 6883 6884 6885 6886 6887 6888 6889

  bool has_errors() { return is_grave; }

private:
  bool is_grave;
};

bool
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6890 6891 6892 6893 6894 6895 6896
Silence_routine_definer_errors::handle_condition(
  THD *thd,
  uint sql_errno,
  const char*,
  MYSQL_ERROR::enum_warning_level level,
  const char* msg,
  MYSQL_ERROR ** cond_hdl)
6897
{
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6898
  *cond_hdl= NULL;
6899 6900 6901 6902 6903 6904
  if (level == MYSQL_ERROR::WARN_LEVEL_ERROR)
  {
    switch (sql_errno)
    {
      case ER_NONEXISTING_PROC_GRANT:
        /* Convert the error into a warning. */
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6905 6906
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                     sql_errno, msg);
6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921
        return TRUE;
      default:
        is_grave= TRUE;
    }
  }

  return FALSE;
}


/**
  Revoke privileges for all users on a stored procedure.  Use an error handler
  that converts errors about missing grants into warnings.

  @param
6922
    thd                         The current thread.
6923
  @param
6924
    db				DB of the stored procedure
6925
  @param
6926 6927
    name			Name of the stored procedure

6928
  @retval
6929
    0           OK.
6930
  @retval
6931 6932 6933
    < 0         Error. Error message not yet sent.
*/

6934 6935
bool sp_revoke_privileges(THD *thd, const char *sp_db, const char *sp_name,
                          bool is_proc)
6936 6937 6938 6939
{
  uint counter, revoked;
  int result;
  TABLE_LIST tables[GRANT_TABLES];
6940
  HASH *hash= is_proc ? &proc_priv_hash : &func_priv_hash;
6941
  Silence_routine_definer_errors error_handler;
6942
  bool save_binlog_row_based;
6943 6944 6945 6946 6947
  DBUG_ENTER("sp_revoke_privileges");

  if ((result= open_grant_tables(thd, tables)))
    DBUG_RETURN(result != 1);

6948 6949 6950
  /* Be sure to pop this before exiting this scope! */
  thd->push_internal_handler(&error_handler);

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6951 6952
  mysql_rwlock_wrlock(&LOCK_grant);
  mysql_mutex_lock(&acl_cache->lock);
6953

6954 6955 6956 6957 6958
  /*
    This statement will be replicated as a statement, even when using
    row-based replication.  The flag will be reset at the end of the
    statement.
  */
6959 6960
  if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
    thd->clear_current_stmt_binlog_format_row();
6961

6962
  /* Remove procedure access */
6963 6964
  do
  {
6965
    for (counter= 0, revoked= 0 ; counter < hash->records ; )
6966
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
6967
      GRANT_NAME *grant_proc= (GRANT_NAME*) my_hash_element(hash, counter);
6968
      if (!my_strcasecmp(&my_charset_utf8_bin, grant_proc->db, sp_db) &&
6969 6970 6971 6972 6973
	  !my_strcasecmp(system_charset_info, grant_proc->tname, sp_name))
      {
        LEX_USER lex_user;
	lex_user.user.str= grant_proc->user;
	lex_user.user.length= strlen(grant_proc->user);
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	lex_user.host.str= grant_proc->host.hostname ?
	  grant_proc->host.hostname : (char*)"";
	lex_user.host.length= grant_proc->host.hostname ?
	  strlen(grant_proc->host.hostname) : 0;
6978 6979 6980 6981

	if (replace_routine_table(thd,grant_proc,tables[4].table,lex_user,
				  grant_proc->db, grant_proc->tname,
                                  is_proc, ~(ulong)0, 1) == 0)
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	{
	  revoked= 1;
	  continue;
	}
      }
      counter++;
    }
  } while (revoked);

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6991 6992
  mysql_mutex_unlock(&acl_cache->lock);
  mysql_rwlock_unlock(&LOCK_grant);
6993

6994
  thd->pop_internal_handler();
6995
  /* Restore the state of binlog format */
6996
  DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
6997 6998
  if (save_binlog_row_based)
    thd->set_current_stmt_binlog_format_row();
6999

7000
  DBUG_RETURN(error_handler.has_errors());
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}


7004
/**
7005 7006
  Grant EXECUTE,ALTER privilege for a stored procedure

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  @param thd The current thread.
  @param sp_db
  @param sp_name
  @param is_proc
7011

7012 7013 7014
  @return
    @retval FALSE Success
    @retval TRUE An error occured. Error message not yet sent.
7015 7016
*/

7017
bool sp_grant_privileges(THD *thd, const char *sp_db, const char *sp_name,
7018
                         bool is_proc)
7019
{
7020
  Security_context *sctx= thd->security_ctx;
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  LEX_USER *combo;
  TABLE_LIST tables[1];
  List<LEX_USER> user_list;
  bool result;
7025 7026
  ACL_USER *au;
  char passwd_buff[SCRAMBLED_PASSWORD_CHAR_LENGTH+1];
7027
  Dummy_error_handler error_handler;
7028
  DBUG_ENTER("sp_grant_privileges");
7029 7030 7031 7032

  if (!(combo=(LEX_USER*) thd->alloc(sizeof(st_lex_user))))
    DBUG_RETURN(TRUE);

7033
  combo->user.str= sctx->user;
7034

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7035
  mysql_mutex_lock(&acl_cache->lock);
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  if ((au= find_acl_user(combo->host.str=(char*)sctx->host_or_ip,combo->user.str,FALSE)))
    goto found_acl;
  if ((au= find_acl_user(combo->host.str=(char*)sctx->host, combo->user.str,FALSE)))
    goto found_acl;
  if ((au= find_acl_user(combo->host.str=(char*)sctx->ip, combo->user.str,FALSE)))
    goto found_acl;
  if((au= find_acl_user(combo->host.str=(char*)"%", combo->user.str, FALSE)))
    goto found_acl;

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7046
  mysql_mutex_unlock(&acl_cache->lock);
7047 7048 7049
  DBUG_RETURN(TRUE);

 found_acl:
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7050
  mysql_mutex_unlock(&acl_cache->lock);
7051 7052 7053 7054 7055

  bzero((char*)tables, sizeof(TABLE_LIST));
  user_list.empty();

  tables->db= (char*)sp_db;
7056
  tables->table_name= tables->alias= (char*)sp_name;
7057

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  thd->make_lex_string(&combo->user,
                       combo->user.str, strlen(combo->user.str), 0);
  thd->make_lex_string(&combo->host,
                       combo->host.str, strlen(combo->host.str), 0);
7062

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  combo->password= empty_lex_str;
  combo->plugin= empty_lex_str;
  combo->auth= empty_lex_str;
7066

7067
  if(au)
7068
  {
7069
    if (au->salt_len)
7070
    {
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      if (au->salt_len == SCRAMBLE_LENGTH)
      {
        make_password_from_salt(passwd_buff, au->salt);
        combo->password.length= SCRAMBLED_PASSWORD_CHAR_LENGTH;
      }
      else if (au->salt_len == SCRAMBLE_LENGTH_323)
      {
        make_password_from_salt_323(passwd_buff, (ulong *) au->salt);
        combo->password.length= SCRAMBLED_PASSWORD_CHAR_LENGTH_323;
      }
      else
      {
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_PASSWD_LENGTH,
                            ER(ER_PASSWD_LENGTH), SCRAMBLED_PASSWORD_CHAR_LENGTH);
        return TRUE;
      }
      combo->password.str= passwd_buff;
7088
    }
7089 7090 7091

    if (au->plugin.str != native_password_plugin_name.str &&
        au->plugin.str != old_password_plugin_name.str)
7092
    {
7093 7094
      combo->plugin= au->plugin;
      combo->auth= au->auth_string;
7095 7096
    }
  }
7097 7098 7099 7100 7101

  if (user_list.push_back(combo))
    DBUG_RETURN(TRUE);

  thd->lex->ssl_type= SSL_TYPE_NOT_SPECIFIED;
7102
  thd->lex->ssl_cipher= thd->lex->x509_subject= thd->lex->x509_issuer= 0;
7103
  bzero((char*) &thd->lex->mqh, sizeof(thd->lex->mqh));
7104

7105 7106 7107 7108 7109
  /*
    Only care about whether the operation failed or succeeded
    as all errors will be handled later.
  */
  thd->push_internal_handler(&error_handler);
7110
  result= mysql_routine_grant(thd, tables, is_proc, user_list,
7111 7112
                              DEFAULT_CREATE_PROC_ACLS, FALSE, FALSE);
  thd->pop_internal_handler();
7113 7114 7115 7116
  DBUG_RETURN(result);
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
7117
/*****************************************************************************
7118
  Instantiate used templates
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7119 7120
*****************************************************************************/

7121
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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7122 7123 7124 7125 7126
template class List_iterator<LEX_COLUMN>;
template class List_iterator<LEX_USER>;
template class List<LEX_COLUMN>;
template class List<LEX_USER>;
#endif
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7127

7128 7129 7130 7131 7132 7133 7134
/**
  Validate if a user can proxy as another user

  @thd                     current thread
  @param user              the logged in user (proxy user)
  @param authenticated_as  the effective user a plugin is trying to 
                           impersonate as (proxied user)
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  @return                  proxy user definition
    @retval NULL           proxy user definition not found or not applicable
    @retval non-null       the proxy user data
7138 7139
*/

7140
static ACL_PROXY_USER *
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acl_find_proxy_user(const char *user, const char *host, const char *ip, 
                    const char *authenticated_as, bool *proxy_used)
{
  uint i;
  /* if the proxied and proxy user are the same return OK */
7146 7147 7148
  DBUG_ENTER("acl_find_proxy_user");
  DBUG_PRINT("info", ("user=%s host=%s ip=%s authenticated_as=%s",
                      user, host, ip, authenticated_as));
7149

7150
  if (!strcmp(authenticated_as, user))
7151 7152
  {
    DBUG_PRINT ("info", ("user is the same as authenticated_as"));
7153
    DBUG_RETURN (NULL);
7154 7155 7156
  }

  *proxy_used= TRUE; 
7157
  for (i=0; i < acl_proxy_users.elements; i++)
7158
  {
7159 7160 7161
    ACL_PROXY_USER *proxy= dynamic_element(&acl_proxy_users, i, 
                                           ACL_PROXY_USER *);
    if (proxy->matches(host, user, ip, authenticated_as))
7162
      DBUG_RETURN(proxy);
7163 7164
  }

7165
  DBUG_RETURN(NULL);
7166 7167 7168 7169
}


bool
7170 7171
acl_check_proxy_grant_access(THD *thd, const char *host, const char *user,
                             bool with_grant)
7172
{
7173 7174 7175
  DBUG_ENTER("acl_check_proxy_grant_access");
  DBUG_PRINT("info", ("user=%s host=%s with_grant=%d", user, host, 
                      (int) with_grant));
7176 7177 7178 7179 7180 7181 7182 7183 7184
  if (!initialized)
  {
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
    DBUG_RETURN(1);
  }

  /* replication slave thread can do anything */
  if (thd->slave_thread)
  {
7185
    DBUG_PRINT("info", ("replication slave"));
7186 7187 7188 7189 7190 7191 7192 7193
    DBUG_RETURN(FALSE);
  }

  /* one can grant proxy to himself to others */
  if (!strcmp(thd->security_ctx->user, user) &&
      !my_strcasecmp(system_charset_info, host,
                     thd->security_ctx->host))
  {
7194 7195 7196
    DBUG_PRINT("info", ("strcmp (%s, %s) my_casestrcmp (%s, %s) equal", 
                        thd->security_ctx->user, user,
                        host, thd->security_ctx->host));
7197 7198 7199 7200
    DBUG_RETURN(FALSE);
  }

  /* check for matching WITH PROXY rights */
7201 7202 7203 7204 7205 7206 7207 7208
  for (uint i=0; i < acl_proxy_users.elements; i++)
  {
    ACL_PROXY_USER *proxy= dynamic_element(&acl_proxy_users, i, 
                                           ACL_PROXY_USER *);
    if (proxy->matches(thd->security_ctx->host,
                       thd->security_ctx->user,
                       thd->security_ctx->ip,
                       user) &&
7209 7210
        proxy->get_with_grant())
    {
7211
      DBUG_PRINT("info", ("found"));
7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222 7223
      DBUG_RETURN(FALSE);
    }
  }

  my_error(ER_ACCESS_DENIED_NO_PASSWORD_ERROR, MYF(0),
           thd->security_ctx->user,
           thd->security_ctx->host_or_ip);
  DBUG_RETURN(TRUE);
}


static bool
7224
show_proxy_grants(THD *thd, LEX_USER *user, char *buff, size_t buffsize)
7225 7226 7227 7228
{
  Protocol *protocol= thd->protocol;
  int error= 0;

7229
  for (uint i=0; i < acl_proxy_users.elements; i++)
7230
  {
7231 7232
    ACL_PROXY_USER *proxy= dynamic_element(&acl_proxy_users, i,
                                           ACL_PROXY_USER *);
7233 7234 7235 7236 7237 7238
    if (proxy->granted_on(user->host.str, user->user.str))
    {
      String global(buff, buffsize, system_charset_info);
      global.length(0);
      proxy->print_grant(&global);
      protocol->prepare_for_resend();
7239
      protocol->store(global.ptr(), global.length(), global.charset());
7240 7241 7242 7243 7244 7245 7246 7247 7248 7249 7250
      if (protocol->write())
      {
        error= -1;
        break;
      }
    }
  }
  return error;
}


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hf@deer.(none) committed
7251 7252 7253 7254 7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265 7266 7267 7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279 7280 7281 7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296
#endif /*NO_EMBEDDED_ACCESS_CHECKS */


int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr)
{
  reg3 int flag;
  DBUG_ENTER("wild_case_compare");
  DBUG_PRINT("enter",("str: '%s'  wildstr: '%s'",str,wildstr));
  while (*wildstr)
  {
    while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)
    {
      if (*wildstr == wild_prefix && wildstr[1])
	wildstr++;
      if (my_toupper(cs, *wildstr++) !=
          my_toupper(cs, *str++)) DBUG_RETURN(1);
    }
    if (! *wildstr ) DBUG_RETURN (*str != 0);
    if (*wildstr++ == wild_one)
    {
      if (! *str++) DBUG_RETURN (1);	/* One char; skip */
    }
    else
    {						/* Found '*' */
      if (!*wildstr) DBUG_RETURN(0);		/* '*' as last char: OK */
      flag=(*wildstr != wild_many && *wildstr != wild_one);
      do
      {
	if (flag)
	{
	  char cmp;
	  if ((cmp= *wildstr) == wild_prefix && wildstr[1])
	    cmp=wildstr[1];
	  cmp=my_toupper(cs, cmp);
	  while (*str && my_toupper(cs, *str) != cmp)
	    str++;
	  if (!*str) DBUG_RETURN (1);
	}
	if (wild_case_compare(cs, str,wildstr) == 0) DBUG_RETURN (0);
      } while (*str++);
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN (*str != '\0');
}

7297

Sergey Glukhov's avatar
Sergey Glukhov committed
7298
#ifndef NO_EMBEDDED_ACCESS_CHECKS
7299 7300 7301 7302 7303
static bool update_schema_privilege(THD *thd, TABLE *table, char *buff,
                                    const char* db, const char* t_name,
                                    const char* column, uint col_length,
                                    const char *priv, uint priv_length,
                                    const char* is_grantable)
7304 7305 7306
{
  int i= 2;
  CHARSET_INFO *cs= system_charset_info;
7307
  restore_record(table, s->default_values);
7308
  table->field[0]->store(buff, (uint) strlen(buff), cs);
7309
  table->field[1]->store(STRING_WITH_LEN("def"), cs);
7310
  if (db)
7311
    table->field[i++]->store(db, (uint) strlen(db), cs);
7312
  if (t_name)
7313
    table->field[i++]->store(t_name, (uint) strlen(t_name), cs);
7314 7315 7316 7317
  if (column)
    table->field[i++]->store(column, col_length, cs);
  table->field[i++]->store(priv, priv_length, cs);
  table->field[i]->store(is_grantable, strlen(is_grantable), cs);
7318
  return schema_table_store_record(thd, table);
7319
}
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7320
#endif
7321 7322 7323 7324 7325


int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
7326
  int error= 0;
7327 7328 7329 7330 7331
  uint counter;
  ACL_USER *acl_user;
  ulong want_access;
  char buff[100];
  TABLE *table= tables->table;
Marc Alff's avatar
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7332 7333
  bool no_global_access= check_access(thd, SELECT_ACL, "mysql",
                                      NULL, NULL, 1, 1);
7334
  char *curr_host= thd->security_ctx->priv_host_name();
7335
  DBUG_ENTER("fill_schema_user_privileges");
7336

7337 7338
  if (!initialized)
    DBUG_RETURN(0);
Marc Alff's avatar
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7339
  mysql_mutex_lock(&acl_cache->lock);
7340

7341 7342 7343 7344 7345 7346 7347 7348
  for (counter=0 ; counter < acl_users.elements ; counter++)
  {
    const char *user,*host, *is_grantable="YES";
    acl_user=dynamic_element(&acl_users,counter,ACL_USER*);
    if (!(user=acl_user->user))
      user= "";
    if (!(host=acl_user->host.hostname))
      host= "";
7349 7350

    if (no_global_access &&
7351
        (strcmp(thd->security_ctx->priv_user, user) ||
7352 7353 7354
         my_strcasecmp(system_charset_info, curr_host, host)))
      continue;
      
7355 7356 7357 7358 7359 7360
    want_access= acl_user->access;
    if (!(want_access & GRANT_ACL))
      is_grantable= "NO";

    strxmov(buff,"'",user,"'@'",host,"'",NullS);
    if (!(want_access & ~GRANT_ACL))
7361 7362 7363 7364 7365 7366 7367 7368
    {
      if (update_schema_privilege(thd, table, buff, 0, 0, 0, 0,
                                  STRING_WITH_LEN("USAGE"), is_grantable))
      {
        error= 1;
        goto err;
      }
    }
7369 7370 7371 7372 7373 7374 7375
    else
    {
      uint priv_id;
      ulong j,test_access= want_access & ~GRANT_ACL;
      for (priv_id=0, j = SELECT_ACL;j <= GLOBAL_ACLS; priv_id++,j <<= 1)
      {
	if (test_access & j)
7376 7377 7378 7379 7380 7381 7382 7383 7384
        {
          if (update_schema_privilege(thd, table, buff, 0, 0, 0, 0, 
                                      command_array[priv_id],
                                      command_lengths[priv_id], is_grantable))
          {
            error= 1;
            goto err;
          }
        }
7385 7386 7387
      }
    }
  }
7388
err:
Marc Alff's avatar
Marc Alff committed
7389
  mysql_mutex_unlock(&acl_cache->lock);
7390

7391
  DBUG_RETURN(error);
7392 7393 7394
#else
  return(0);
#endif
7395 7396 7397 7398 7399 7400
}


int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
7401
  int error= 0;
7402 7403 7404 7405 7406
  uint counter;
  ACL_DB *acl_db;
  ulong want_access;
  char buff[100];
  TABLE *table= tables->table;
Marc Alff's avatar
Marc Alff committed
7407 7408
  bool no_global_access= check_access(thd, SELECT_ACL, "mysql",
                                      NULL, NULL, 1, 1);
7409
  char *curr_host= thd->security_ctx->priv_host_name();
7410 7411
  DBUG_ENTER("fill_schema_schema_privileges");

7412 7413
  if (!initialized)
    DBUG_RETURN(0);
Marc Alff's avatar
Marc Alff committed
7414
  mysql_mutex_lock(&acl_cache->lock);
7415

7416 7417 7418 7419 7420 7421 7422 7423 7424 7425
  for (counter=0 ; counter < acl_dbs.elements ; counter++)
  {
    const char *user, *host, *is_grantable="YES";

    acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
    if (!(user=acl_db->user))
      user= "";
    if (!(host=acl_db->host.hostname))
      host= "";

7426
    if (no_global_access &&
7427
        (strcmp(thd->security_ctx->priv_user, user) ||
7428 7429 7430
         my_strcasecmp(system_charset_info, curr_host, host)))
      continue;

7431 7432 7433 7434 7435 7436 7437 7438 7439
    want_access=acl_db->access;
    if (want_access)
    {
      if (!(want_access & GRANT_ACL))
      {
        is_grantable= "NO";
      }
      strxmov(buff,"'",user,"'@'",host,"'",NullS);
      if (!(want_access & ~GRANT_ACL))
7440 7441 7442 7443 7444 7445 7446 7447
      {
        if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0,
                                    0, STRING_WITH_LEN("USAGE"), is_grantable))
        {
          error= 1;
          goto err;
        }
      }
7448 7449 7450 7451 7452 7453
      else
      {
        int cnt;
        ulong j,test_access= want_access & ~GRANT_ACL;
        for (cnt=0, j = SELECT_ACL; j <= DB_ACLS; cnt++,j <<= 1)
          if (test_access & j)
7454 7455 7456 7457 7458 7459 7460 7461 7462
          {
            if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0, 0,
                                        command_array[cnt], command_lengths[cnt],
                                        is_grantable))
            {
              error= 1;
              goto err;
            }
          }
7463 7464 7465
      }
    }
  }
7466
err:
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7467
  mysql_mutex_unlock(&acl_cache->lock);
7468

7469
  DBUG_RETURN(error);
7470 7471 7472
#else
  return (0);
#endif
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}


int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
7479
  int error= 0;
7480 7481 7482
  uint index;
  char buff[100];
  TABLE *table= tables->table;
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7483 7484
  bool no_global_access= check_access(thd, SELECT_ACL, "mysql",
                                      NULL, NULL, 1, 1);
7485
  char *curr_host= thd->security_ctx->priv_host_name();
7486 7487
  DBUG_ENTER("fill_schema_table_privileges");

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7488
  mysql_rwlock_rdlock(&LOCK_grant);
7489

7490 7491
  for (index=0 ; index < column_priv_hash.records ; index++)
  {
7492
    const char *user, *host, *is_grantable= "YES";
Konstantin Osipov's avatar
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7493
    GRANT_TABLE *grant_table= (GRANT_TABLE*) my_hash_element(&column_priv_hash,
7494 7495 7496
							  index);
    if (!(user=grant_table->user))
      user= "";
7497 7498
    if (!(host= grant_table->host.hostname))
      host= "";
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    if (no_global_access &&
7501
        (strcmp(thd->security_ctx->priv_user, user) ||
7502
         my_strcasecmp(system_charset_info, curr_host, host)))
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      continue;

7505
    ulong table_access= grant_table->privs;
7506
    if (table_access)
7507 7508
    {
      ulong test_access= table_access & ~GRANT_ACL;
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      /*
        We should skip 'usage' privilege on table if
        we have any privileges on column(s) of this table
      */
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      if (!test_access && grant_table->cols)
        continue;
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      if (!(table_access & GRANT_ACL))
        is_grantable= "NO";

7518
      strxmov(buff, "'", user, "'@'", host, "'", NullS);
7519
      if (!test_access)
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      {
        if (update_schema_privilege(thd, table, buff, grant_table->db,
                                    grant_table->tname, 0, 0,
                                    STRING_WITH_LEN("USAGE"), is_grantable))
        {
          error= 1;
          goto err;
        }
      }
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      else
      {
        ulong j;
        int cnt;
        for (cnt= 0, j= SELECT_ACL; j <= TABLE_ACLS; cnt++, j<<= 1)
        {
          if (test_access & j)
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          {
            if (update_schema_privilege(thd, table, buff, grant_table->db,
                                        grant_table->tname, 0, 0,
                                        command_array[cnt],
                                        command_lengths[cnt], is_grantable))
            {
              error= 1;
              goto err;
            }
          }
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        }
      }
7548
    }   
7549
  }
7550
err:
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7551
  mysql_rwlock_unlock(&LOCK_grant);
7552

7553
  DBUG_RETURN(error);
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#else
  return (0);
#endif
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}


int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
7563
  int error= 0;
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  uint index;
  char buff[100];
  TABLE *table= tables->table;
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7567 7568
  bool no_global_access= check_access(thd, SELECT_ACL, "mysql",
                                      NULL, NULL, 1, 1);
7569
  char *curr_host= thd->security_ctx->priv_host_name();
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  DBUG_ENTER("fill_schema_table_privileges");

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7572
  mysql_rwlock_rdlock(&LOCK_grant);
7573

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  for (index=0 ; index < column_priv_hash.records ; index++)
  {
7576
    const char *user, *host, *is_grantable= "YES";
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7577
    GRANT_TABLE *grant_table= (GRANT_TABLE*) my_hash_element(&column_priv_hash,
7578 7579 7580
							  index);
    if (!(user=grant_table->user))
      user= "";
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    if (!(host= grant_table->host.hostname))
      host= "";
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    if (no_global_access &&
7585
        (strcmp(thd->security_ctx->priv_user, user) ||
7586
         my_strcasecmp(system_charset_info, curr_host, host)))
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      continue;

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    ulong table_access= grant_table->cols;
    if (table_access != 0)
    {
7592
      if (!(grant_table->privs & GRANT_ACL))
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        is_grantable= "NO";

7595
      ulong test_access= table_access & ~GRANT_ACL;
7596
      strxmov(buff, "'", user, "'@'", host, "'", NullS);
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      if (!test_access)
        continue;
      else
      {
        ulong j;
        int cnt;
        for (cnt= 0, j= SELECT_ACL; j <= TABLE_ACLS; cnt++, j<<= 1)
        {
          if (test_access & j)
          {
            for (uint col_index=0 ;
                 col_index < grant_table->hash_columns.records ;
                 col_index++)
            {
              GRANT_COLUMN *grant_column = (GRANT_COLUMN*)
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7612
                my_hash_element(&grant_table->hash_columns,col_index);
7613
              if ((grant_column->rights & j) && (table_access & j))
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              {
                if (update_schema_privilege(thd, table, buff, grant_table->db,
                                            grant_table->tname,
                                            grant_column->column,
                                            grant_column->key_length,
                                            command_array[cnt],
                                            command_lengths[cnt], is_grantable))
                {
                  error= 1;
                  goto err;
                }
              }
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            }
          }
        }
      }
    }
  }
7632
err:
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7633
  mysql_rwlock_unlock(&LOCK_grant);
7634

7635
  DBUG_RETURN(error);
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#else
  return (0);
#endif
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}


bell@sanja.is.com.ua's avatar
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7642 7643 7644 7645 7646
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/*
  fill effective privileges for table

  SYNOPSIS
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    fill_effective_table_privileges()
    thd     thread handler
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    grant   grants table descriptor
    db      db name
    table   table name
*/

void fill_effective_table_privileges(THD *thd, GRANT_INFO *grant,
                                     const char *db, const char *table)
{
7657
  Security_context *sctx= thd->security_ctx;
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  DBUG_ENTER("fill_effective_table_privileges");
  DBUG_PRINT("enter", ("Host: '%s', Ip: '%s', User: '%s', table: `%s`.`%s`",
                       sctx->priv_host, (sctx->ip ? sctx->ip : "(NULL)"),
                       (sctx->priv_user ? sctx->priv_user : "(NULL)"),
                       db, table));
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  /* --skip-grants */
  if (!initialized)
  {
7666
    DBUG_PRINT("info", ("skip grants"));
7667
    grant->privilege= ~NO_ACCESS;             // everything is allowed
7668 7669
    DBUG_PRINT("info", ("privilege 0x%lx", grant->privilege));
    DBUG_VOID_RETURN;
7670 7671
  }

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7672
  /* global privileges */
7673
  grant->privilege= sctx->master_access;
7674

7675
  if (!sctx->priv_user)
7676 7677 7678 7679
  {
    DBUG_PRINT("info", ("privilege 0x%lx", grant->privilege));
    DBUG_VOID_RETURN;                         // it is slave
  }
7680

7681
  /* db privileges */
7682
  grant->privilege|= acl_get(sctx->host, sctx->ip, sctx->priv_user, db, 0);
7683

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7684
  /* table privileges */
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7685
  mysql_rwlock_rdlock(&LOCK_grant);
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7686 7687 7688
  if (grant->version != grant_version)
  {
    grant->grant_table=
7689 7690
      table_hash_search(sctx->host, sctx->ip, db,
			sctx->priv_user,
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7691 7692 7693 7694 7695 7696 7697
			table, 0);              /* purecov: inspected */
    grant->version= grant_version;              /* purecov: inspected */
  }
  if (grant->grant_table != 0)
  {
    grant->privilege|= grant->grant_table->privs;
  }
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7698
  mysql_rwlock_unlock(&LOCK_grant);
7699

7700 7701
  DBUG_PRINT("info", ("privilege 0x%lx", grant->privilege));
  DBUG_VOID_RETURN;
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7702
}
7703 7704 7705 7706 7707 7708 7709

#else /* NO_EMBEDDED_ACCESS_CHECKS */

/****************************************************************************
 Dummy wrappers when we don't have any access checks
****************************************************************************/

acurtis@xiphis.org's avatar
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7710 7711
bool check_routine_level_acl(THD *thd, const char *db, const char *name,
                             bool is_proc)
7712 7713 7714 7715
{
  return FALSE;
}

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7716
#endif
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struct ACL_internal_schema_registry_entry
{
  const LEX_STRING *m_name;
  const ACL_internal_schema_access *m_access;
};

/**
  Internal schema registered.
  Currently, this is only:
  - performance_schema
  - information_schema,
  This can be reused later for:
  - mysql
*/
static ACL_internal_schema_registry_entry registry_array[2];
static uint m_registry_array_size= 0;

/**
  Add an internal schema to the registry.
  @param name the schema name
  @param access the schema ACL specific rules
*/
void ACL_internal_schema_registry::register_schema
  (const LEX_STRING *name, const ACL_internal_schema_access *access)
{
  DBUG_ASSERT(m_registry_array_size < array_elements(registry_array));

  /* Not thread safe, and does not need to be. */
  registry_array[m_registry_array_size].m_name= name;
  registry_array[m_registry_array_size].m_access= access;
  m_registry_array_size++;
}

/**
  Search per internal schema ACL by name.
  @param name a schema name
  @return per schema rules, or NULL
*/
const ACL_internal_schema_access *
ACL_internal_schema_registry::lookup(const char *name)
{
  DBUG_ASSERT(name != NULL);

  uint i;

  for (i= 0; i<m_registry_array_size; i++)
  {
    if (my_strcasecmp(system_charset_info, registry_array[i].m_name->str,
                      name) == 0)
      return registry_array[i].m_access;
  }
  return NULL;
}

/**
  Get a cached internal schema access.
  @param grant_internal_info the cache
  @param schema_name the name of the internal schema
*/
const ACL_internal_schema_access *
get_cached_schema_access(GRANT_INTERNAL_INFO *grant_internal_info,
                         const char *schema_name)
{
  if (grant_internal_info)
  {
    if (! grant_internal_info->m_schema_lookup_done)
    {
      grant_internal_info->m_schema_access=
        ACL_internal_schema_registry::lookup(schema_name);
      grant_internal_info->m_schema_lookup_done= TRUE;
    }
    return grant_internal_info->m_schema_access;
  }
  return ACL_internal_schema_registry::lookup(schema_name);
}

/**
  Get a cached internal table access.
  @param grant_internal_info the cache
  @param schema_name the name of the internal schema
  @param table_name the name of the internal table
*/
const ACL_internal_table_access *
get_cached_table_access(GRANT_INTERNAL_INFO *grant_internal_info,
                        const char *schema_name,
                        const char *table_name)
{
  DBUG_ASSERT(grant_internal_info);
  if (! grant_internal_info->m_table_lookup_done)
  {
    const ACL_internal_schema_access *schema_access;
    schema_access= get_cached_schema_access(grant_internal_info, schema_name);
    if (schema_access)
      grant_internal_info->m_table_access= schema_access->lookup(table_name);
    grant_internal_info->m_table_lookup_done= TRUE;
  }
  return grant_internal_info->m_table_access;
}


7818 7819 7820 7821 7822 7823 7824 7825 7826 7827 7828 7829 7830
/****************************************************************************
   AUTHENTICATION CODE
   including initial connect handshake, invoking appropriate plugins,
   client-server plugin negotiation, COM_CHANGE_USER, and native
   MySQL authentication plugins.
****************************************************************************/

/* few defines to have less ifdef's in the code below */
#ifdef EMBEDDED_LIBRARY
#undef HAVE_OPENSSL
#ifdef NO_EMBEDDED_ACCESS_CHECKS
#define initialized 0
#define decrease_user_connections(X)        /* nothing */
7831
#define check_for_max_user_connections(X, Y)   0
7832 7833 7834 7835 7836 7837 7838 7839 7840 7841 7842 7843 7844 7845 7846
#endif
#endif
#ifndef HAVE_OPENSSL
#define ssl_acceptor_fd 0
#define sslaccept(A,B,C) 1
#endif


class Thd_charset_adapter
{
  THD *thd;
public:
  Thd_charset_adapter(THD *thd_arg) : thd (thd_arg) {} 
  bool init_client_charset(uint cs_number)
  {
7847 7848
    if (thd_init_client_charset(thd, cs_number))
      return true;
7849 7850 7851 7852 7853 7854 7855 7856 7857 7858 7859 7860
    thd->update_charset();
    return thd->is_error();
  }

  CHARSET_INFO *charset() { return thd->charset(); }
};


/**
  The internal version of what plugins know as MYSQL_PLUGIN_VIO,
  basically the context of the authentication session
*/
7861
struct MPVIO_EXT :public MYSQL_PLUGIN_VIO
7862 7863 7864 7865 7866 7867 7868 7869 7870 7871 7872 7873 7874 7875 7876 7877 7878 7879 7880 7881 7882 7883 7884 7885 7886 7887 7888 7889 7890 7891 7892 7893 7894 7895 7896 7897 7898 7899 7900 7901 7902 7903 7904 7905 7906 7907 7908 7909 7910 7911 7912 7913 7914
{
  MYSQL_SERVER_AUTH_INFO auth_info;
  const ACL_USER *acl_user;
  plugin_ref plugin;        ///< what plugin we're under
  LEX_STRING db;            ///< db name from the handshake packet
  /** when restarting a plugin this caches the last client reply */
  struct {
    char *plugin, *pkt;     ///< pointers into NET::buff
    uint pkt_len;
  } cached_client_reply;
  /** this caches the first plugin packet for restart request on the client */
  struct {
    char *pkt;
    uint pkt_len;
  } cached_server_packet;
  int packets_read, packets_written; ///< counters for send/received packets
  uint connect_errors;      ///< if there were connect errors for this host
  /** when plugin returns a failure this tells us what really happened */
  enum { SUCCESS, FAILURE, RESTART } status;

  /* encapsulation members */
  ulong client_capabilities;
  char *scramble;
  MEM_ROOT *mem_root;
  struct  rand_struct *rand;
  my_thread_id  thread_id;
  uint      *server_status;
  NET *net;
  ulong max_client_packet_length;
  char *ip;
  char *host;
  Thd_charset_adapter *charset_adapter;
  LEX_STRING acl_user_plugin;
};

/**
  a helper function to report an access denied error in all the proper places
*/
static void login_failed_error(MPVIO_EXT *mpvio, int passwd_used)
{
  THD *thd= current_thd;
  if (passwd_used == 2)
  {
    my_error(ER_ACCESS_DENIED_NO_PASSWORD_ERROR, MYF(0),
             mpvio->auth_info.user_name,
             mpvio->auth_info.host_or_ip);
    general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_NO_PASSWORD_ERROR),
                      mpvio->auth_info.user_name,
                      mpvio->auth_info.host_or_ip);
    /* 
      Log access denied messages to the error log when log-warnings = 2
      so that the overhead of the general query log is not required to track 
      failed connections.
7915
    */
7916 7917 7918 7919 7920 7921 7922 7923 7924 7925 7926 7927 7928 7929 7930 7931 7932 7933 7934 7935 7936
    if (global_system_variables.log_warnings > 1)
    {
      sql_print_warning(ER(ER_ACCESS_DENIED_NO_PASSWORD_ERROR),
                        mpvio->auth_info.user_name,
                        mpvio->auth_info.host_or_ip);      
    }
  }
  else
  {
    my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
             mpvio->auth_info.user_name,
             mpvio->auth_info.host_or_ip,
             passwd_used ? ER(ER_YES) : ER(ER_NO));
    general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                      mpvio->auth_info.user_name,
                      mpvio->auth_info.host_or_ip,
                      passwd_used ? ER(ER_YES) : ER(ER_NO));
    /* 
      Log access denied messages to the error log when log-warnings = 2
      so that the overhead of the general query log is not required to track 
      failed connections.
7937
    */
7938 7939 7940 7941 7942 7943 7944 7945 7946 7947 7948 7949 7950 7951 7952 7953 7954 7955 7956 7957 7958 7959 7960 7961 7962 7963 7964 7965 7966 7967 7968 7969 7970 7971 7972 7973 7974 7975 7976 7977 7978
    if (global_system_variables.log_warnings > 1)
    {
      sql_print_warning(ER(ER_ACCESS_DENIED_ERROR),
                        mpvio->auth_info.user_name,
                        mpvio->auth_info.host_or_ip,
                        passwd_used ? ER(ER_YES) : ER(ER_NO));      
    }
  }
}

/**
  sends a server handshake initialization packet, the very first packet
  after the connection was established

  Packet format:
   
    Bytes       Content
    -----       ----
    1           protocol version (always 10)
    n           server version string, \0-terminated
    4           thread id
    8           first 8 bytes of the plugin provided data (scramble)
    1           \0 byte, terminating the first part of a scramble
    2           server capabilities (two lower bytes)
    1           server character set
    2           server status
    2           server capabilities (two upper bytes)
    1           length of the scramble
    10          reserved, always 0
    n           rest of the plugin provided data (at least 12 bytes)
    1           \0 byte, terminating the second part of a scramble

  @retval 0 ok
  @retval 1 error
*/
static bool send_server_handshake_packet(MPVIO_EXT *mpvio,
                                         const char *data, uint data_len)
{
  DBUG_ASSERT(mpvio->status == MPVIO_EXT::FAILURE);
  DBUG_ASSERT(data_len <= 255);

7979
  char *buff= (char *) my_alloca(1 + SERVER_VERSION_LENGTH + data_len + 64);
7980 7981 7982
  char scramble_buf[SCRAMBLE_LENGTH];
  char *end= buff;

7983
  DBUG_ENTER("send_server_handshake_packet");
7984 7985 7986 7987 7988 7989 7990 7991 7992 7993 7994
  *end++= protocol_version;

  mpvio->client_capabilities= CLIENT_BASIC_FLAGS;

  if (opt_using_transactions)
    mpvio->client_capabilities|= CLIENT_TRANSACTIONS;

  mpvio->client_capabilities|= CAN_CLIENT_COMPRESS;

  if (ssl_acceptor_fd)
  {
7995 7996
    mpvio->client_capabilities|= CLIENT_SSL;
    mpvio->client_capabilities|= CLIENT_SSL_VERIFY_SERVER_CERT;
7997 7998 7999 8000
  }

  if (data_len)
  {
8001 8002
    mpvio->cached_server_packet.pkt= (char*) memdup_root(mpvio->mem_root, 
                                                         data, data_len);
8003 8004 8005 8006 8007 8008
    mpvio->cached_server_packet.pkt_len= data_len;
  }

  if (data_len < SCRAMBLE_LENGTH)
  {
    if (data_len)
8009 8010
    {
      /*
8011 8012 8013 8014
        the first packet *must* have at least 20 bytes of a scramble.
        if a plugin provided less, we pad it to 20 with zeros
      */
      memcpy(scramble_buf, data, data_len);
8015
      bzero(scramble_buf + data_len, SCRAMBLE_LENGTH - data_len);
8016 8017 8018 8019 8020 8021 8022 8023 8024 8025 8026 8027 8028 8029 8030 8031 8032 8033 8034 8035 8036 8037 8038 8039 8040 8041 8042 8043
      data= scramble_buf;
    }
    else
    {
      /*
        if the default plugin does not provide the data for the scramble at
        all, we generate a scramble internally anyway, just in case the
        user account (that will be known only later) uses a
        native_password_plugin (which needs a scramble). If we don't send a
        scramble now - wasting 20 bytes in the packet -
        native_password_plugin will have to send it in a separate packet,
        adding one more round trip.
      */
      create_random_string(mpvio->scramble, SCRAMBLE_LENGTH, mpvio->rand);
      data= mpvio->scramble;
    }
    data_len= SCRAMBLE_LENGTH;
  }

  end= strnmov(end, server_version, SERVER_VERSION_LENGTH) + 1;
  int4store((uchar*) end, mpvio->thread_id);
  end+= 4;

  /*
    Old clients does not understand long scrambles, but can ignore packet
    tail: that's why first part of the scramble is placed here, and second
    part at the end of packet.
  */
8044
  end= (char*) memcpy(end, data, SCRAMBLE_LENGTH_323);
8045 8046 8047 8048 8049
  end+= SCRAMBLE_LENGTH_323;
  *end++= 0;
 
  int2store(end, mpvio->client_capabilities);
  /* write server characteristics: up to 16 bytes allowed */
8050 8051 8052
  end[2]= (char) default_charset_info->number;
  int2store(end + 3, mpvio->server_status[0]);
  int2store(end + 5, mpvio->client_capabilities >> 16);
8053
  end[7]= data_len;
8054
  bzero(end + 8, 10);
8055 8056
  end+= 18;
  /* write scramble tail */
8057 8058
  end= (char*) memcpy(end, data + SCRAMBLE_LENGTH_323,
                      data_len - SCRAMBLE_LENGTH_323);
8059 8060 8061 8062
  end+= data_len - SCRAMBLE_LENGTH_323;
  end= strmake(end, plugin_name(mpvio->plugin)->str,
                    plugin_name(mpvio->plugin)->length);

8063
  int res= my_net_write(mpvio->net, (uchar*) buff, (size_t) (end - buff + 1)) ||
8064 8065 8066 8067 8068 8069 8070 8071 8072 8073 8074 8075 8076 8077 8078 8079 8080 8081 8082 8083 8084 8085 8086 8087 8088 8089 8090 8091 8092 8093 8094 8095 8096 8097 8098 8099 8100 8101 8102 8103 8104 8105 8106 8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117 8118 8119 8120 8121 8122 8123 8124 8125
           net_flush(mpvio->net);
  my_afree(buff);
  DBUG_RETURN (res);
}

static bool secure_auth(MPVIO_EXT *mpvio)
{
  THD *thd;
  if (!opt_secure_auth)
    return 0;
  /*
    If the server is running in secure auth mode, short scrambles are 
    forbidden. Extra juggling to report the same error as the old code.
  */

  thd= current_thd;
  if (mpvio->client_capabilities & CLIENT_PROTOCOL_41)
  {
    my_error(ER_SERVER_IS_IN_SECURE_AUTH_MODE, MYF(0),
             mpvio->auth_info.user_name,
             mpvio->auth_info.host_or_ip);
    general_log_print(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                      mpvio->auth_info.user_name,
                      mpvio->auth_info.host_or_ip);
  }
  else
  {
    my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
    general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
  }
  return 1;
}

/**
  sends a "change plugin" packet, requesting a client to restart authentication
  using a different authentication plugin

  Packet format:
   
    Bytes       Content
    -----       ----
    1           byte with the value 254
    n           client plugin to use, \0-terminated
    n           plugin provided data

  In a special case of switching from native_password_plugin to
  old_password_plugin, the packet contains only one - the first - byte,
  plugin name is omitted, plugin data aren't needed as the scramble was
  already sent. This one-byte packet is identical to the "use the short
  scramble" packet in the protocol before plugins were introduced.

  @retval 0 ok
  @retval 1 error
*/
static bool send_plugin_request_packet(MPVIO_EXT *mpvio,
                                       const uchar *data, uint data_len)
{
  DBUG_ASSERT(mpvio->packets_written == 1);
  DBUG_ASSERT(mpvio->packets_read == 1);
  NET *net= mpvio->net;
  static uchar switch_plugin_request_buf[]= { 254 };

8126
  DBUG_ENTER("send_plugin_request_packet");
8127 8128 8129
  mpvio->status= MPVIO_EXT::FAILURE; // the status is no longer RESTART

  const char *client_auth_plugin=
8130
    ((st_mysql_auth *) (plugin_decl(mpvio->plugin)->info))->client_auth_plugin;
8131 8132 8133 8134 8135 8136 8137 8138 8139 8140 8141 8142 8143 8144 8145 8146 8147 8148 8149 8150 8151 8152 8153 8154 8155 8156 8157 8158 8159 8160 8161 8162 8163 8164 8165 8166 8167

  DBUG_ASSERT(client_auth_plugin);

  /*
    we send an old "short 4.0 scramble request", if we need to request a
    client to use 4.0 auth plugin (short scramble) and the scramble was
    already sent to the client

    below, cached_client_reply.plugin is the plugin name that client has used,
    client_auth_plugin is derived from mysql.user table, for the given
    user account, it's the plugin that the client need to use to login.
  */
  bool switch_from_long_to_short_scramble=
    native_password_plugin_name.str == mpvio->cached_client_reply.plugin &&
    client_auth_plugin == old_password_plugin_name.str;

  if (switch_from_long_to_short_scramble)
    DBUG_RETURN (secure_auth(mpvio) ||
                 my_net_write(net, switch_plugin_request_buf, 1) ||
                 net_flush(net));

  /*
    We never request a client to switch from a short to long scramble.
    Plugin-aware clients can do that, but traditionally it meant to
    ask an old 4.0 client to use the new 4.1 authentication protocol.
  */
  bool switch_from_short_to_long_scramble=
    old_password_plugin_name.str == mpvio->cached_client_reply.plugin && 
    client_auth_plugin == native_password_plugin_name.str;

  if (switch_from_short_to_long_scramble)
  {
    my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
    general_log_print(current_thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN (1);
  }

8168 8169 8170 8171 8172 8173 8174 8175 8176 8177 8178 8179 8180 8181 8182 8183 8184 8185
  /*
    If we're dealing with an older client we can't just send a change plugin
    packet to re-initiate the authentication handshake, because the client 
    won't understand it. The good thing is that we don't need to : the old client
    expects us to just check the user credentials here, which we can do by just reading
    the cached data that are placed there by parse_com_change_user_packet() 
    In this case we just do nothing and behave as if normal authentication
    should continue.
  */
  if (!(mpvio->client_capabilities & CLIENT_PLUGIN_AUTH))
  {
    DBUG_PRINT("info", ("old client sent a COM_CHANGE_USER"));
    DBUG_ASSERT(mpvio->cached_client_reply.pkt);
    /* get the status back so the read can process the cached result */
    mpvio->status= MPVIO_EXT::RESTART; 
    DBUG_RETURN(0);
  }

8186 8187 8188 8189 8190 8191
  DBUG_PRINT("info", ("requesting client to use the %s plugin", 
                      client_auth_plugin));
  DBUG_RETURN(net_write_command(net, switch_plugin_request_buf[0],
                                (uchar*) client_auth_plugin,
                                strlen(client_auth_plugin) + 1,
                                (uchar*) data, data_len));
8192 8193 8194 8195 8196 8197 8198 8199 8200 8201 8202 8203 8204 8205 8206 8207 8208
}

#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
   Finds acl entry in user database for authentication purposes.
   
   Finds a user and copies it into mpvio. Reports an authentication
   failure if a user is not found.

   @note find_acl_user is not the same, because it doesn't take into
   account the case when user is not empty, but acl_user->user is empty

   @retval 0    found
   @retval 1    not found
*/
static bool find_mpvio_user(MPVIO_EXT *mpvio)
{
8209 8210
  DBUG_ENTER("find_mpvio_user");
  DBUG_PRINT("info", ("entry: %s", mpvio->auth_info.user_name));
8211 8212
  DBUG_ASSERT(mpvio->acl_user == 0);
  mysql_mutex_lock(&acl_cache->lock);
8213
  for (uint i=0; i < acl_users.elements; i++)
8214
  {
8215
    ACL_USER *acl_user_tmp= dynamic_element(&acl_users, i, ACL_USER*);
8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 8230 8231 8232 8233 8234 8235 8236 8237 8238 8239 8240 8241 8242 8243 8244 8245 8246 8247 8248 8249 8250 8251 8252 8253 8254 8255 8256 8257 8258
    if ((!acl_user_tmp->user || 
         !strcmp(mpvio->auth_info.user_name, acl_user_tmp->user)) &&
        compare_hostname(&acl_user_tmp->host, mpvio->host, mpvio->ip))
    {
      mpvio->acl_user= acl_user_tmp->copy(mpvio->mem_root);
      if (acl_user_tmp->plugin.str == native_password_plugin_name.str ||
          acl_user_tmp->plugin.str == old_password_plugin_name.str)
        mpvio->acl_user_plugin= acl_user_tmp->plugin;
      else
        make_lex_string_root(mpvio->mem_root, 
                             &mpvio->acl_user_plugin, 
                             acl_user_tmp->plugin.str, 
                             acl_user_tmp->plugin.length, 0);
      break;
    }
  }
  mysql_mutex_unlock(&acl_cache->lock);

  if (!mpvio->acl_user)
  {
    login_failed_error(mpvio, 0);
    DBUG_RETURN (1);
  }

  /* user account requires non-default plugin and the client is too old */
  if (mpvio->acl_user->plugin.str != native_password_plugin_name.str &&
      mpvio->acl_user->plugin.str != old_password_plugin_name.str &&
      !(mpvio->client_capabilities & CLIENT_PLUGIN_AUTH))
  {
    DBUG_ASSERT(my_strcasecmp(system_charset_info, mpvio->acl_user->plugin.str,
                              native_password_plugin_name.str));
    DBUG_ASSERT(my_strcasecmp(system_charset_info, mpvio->acl_user->plugin.str,
                              old_password_plugin_name.str));
    my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
    general_log_print(current_thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN (1);
  }

  mpvio->auth_info.auth_string= mpvio->acl_user->auth_string.str;
  mpvio->auth_info.auth_string_length= 
    (unsigned long) mpvio->acl_user->auth_string.length;
  strmake(mpvio->auth_info.authenticated_as, mpvio->acl_user->user ?
          mpvio->acl_user->user : "", USERNAME_LENGTH);
8259 8260 8261 8262 8263 8264 8265
  DBUG_PRINT("info", ("exit: user=%s, auth_string=%s, authenticated as=%s"
                      "plugin=%s",
                      mpvio->auth_info.user_name,
                      mpvio->auth_info.auth_string,
                      mpvio->auth_info.authenticated_as,
                      mpvio->acl_user->plugin.str));
  DBUG_RETURN(0);
8266 8267 8268 8269 8270 8271 8272 8273 8274 8275 8276
}
#endif

/* the packet format is described in send_change_user_packet() */
static bool parse_com_change_user_packet(MPVIO_EXT *mpvio, uint packet_length)
{
  NET *net= mpvio->net;

  char *user= (char*) net->read_pos;
  char *end= user + packet_length;
  /* Safe because there is always a trailing \0 at the end of the packet */
8277
  char *passwd= strend(user) + 1;
8278 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288 8289 8290 8291 8292 8293 8294 8295 8296 8297 8298 8299 8300 8301
  uint user_len= passwd - user - 1;
  char *db= passwd;
  char db_buff[NAME_LEN + 1];                 // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	      // buffer to store user in utf8
  uint dummy_errors;

  DBUG_ENTER ("parse_com_change_user_packet");
  if (passwd >= end)
  {
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
    DBUG_RETURN (1);
  }

  /*
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.

    This strlen() can't be easily deleted without changing protocol.

    Cast *passwd to an unsigned char, so that it doesn't extend the sign for
    *passwd > 127 and become 2**32-127+ after casting to uint.
  */
  uint passwd_len= (mpvio->client_capabilities & CLIENT_SECURE_CONNECTION ?
8302
                    (uchar) (*passwd++) : strlen(passwd));
8303 8304 8305 8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318

  db+= passwd_len + 1;
  /*
    Database name is always NUL-terminated, so in case of empty database
    the packet must contain at least the trailing '\0'.
  */
  if (db >= end)
  {
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
    DBUG_RETURN (1);
  }

  uint db_len= strlen(db);

  char *ptr= db + db_len + 1;

8319
  if (ptr + 1 < end)
8320 8321 8322 8323 8324 8325 8326
  {
    if (mpvio->charset_adapter->init_client_charset(uint2korr(ptr)))
      DBUG_RETURN(1);
  }


  /* Convert database and user names to utf8 */
8327 8328
  db_len= copy_and_convert(db_buff, sizeof(db_buff) - 1, system_charset_info,
                           db, db_len, mpvio->charset_adapter->charset(),
8329 8330 8331
                           &dummy_errors);
  db_buff[db_len]= 0;

8332
  user_len= copy_and_convert(user_buff, sizeof(user_buff) - 1,
8333
                                  system_charset_info, user, user_len,
8334
                                  mpvio->charset_adapter->charset(),
8335 8336 8337 8338 8339 8340 8341 8342 8343 8344
                                  &dummy_errors);
  user_buff[user_len]= 0;

  /* we should not free mpvio->user here: it's saved by dispatch_command() */
  if (!(mpvio->auth_info.user_name= my_strndup(user_buff, user_len, MYF(MY_WME))))
    return 1;
  mpvio->auth_info.user_name_length= user_len;

  if (make_lex_string_root(mpvio->mem_root, 
                           &mpvio->db, db_buff, db_len, 0) == 0)
8345
    DBUG_RETURN(1); /* The error is set by make_lex_string(). */
8346 8347 8348 8349 8350 8351 8352 8353

  if (!initialized)
  {
    // if mysqld's been started with --skip-grant-tables option
    strmake(mpvio->auth_info.authenticated_as, 
            mpvio->auth_info.user_name, USERNAME_LENGTH);

    mpvio->status= MPVIO_EXT::SUCCESS;
8354
    DBUG_RETURN(0);
8355 8356 8357 8358
  }

#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (find_mpvio_user(mpvio))
8359
    DBUG_RETURN(1);
8360 8361 8362 8363 8364 8365 8366 8367

  char *client_plugin;
  if (mpvio->client_capabilities & CLIENT_PLUGIN_AUTH)
  {
    client_plugin= ptr + 2;
    if (client_plugin >= end)
    {
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
8368
      DBUG_RETURN(1);
8369 8370 8371 8372 8373 8374 8375 8376 8377 8378 8379 8380 8381 8382 8383 8384 8385 8386 8387 8388
    }
  }
  else
  {
    if (mpvio->client_capabilities & CLIENT_SECURE_CONNECTION)
      client_plugin= native_password_plugin_name.str;
    else
    {
      client_plugin=  old_password_plugin_name.str;
      /*
        For a passwordless accounts we use native_password_plugin.
        But when an old 4.0 client connects to it, we change it to
        old_password_plugin, otherwise MySQL will think that server 
        and client plugins don't match.
      */
      if (mpvio->acl_user->auth_string.length == 0)
        mpvio->acl_user_plugin= old_password_plugin_name;
    }
  }

8389
  DBUG_PRINT("info", ("client_plugin=%s, restart", client_plugin));
8390 8391 8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402
  /* 
    Remember the data part of the packet, to present it to plugin in 
    read_packet() 
  */
  mpvio->cached_client_reply.pkt= passwd;
  mpvio->cached_client_reply.pkt_len= passwd_len;
  mpvio->cached_client_reply.plugin= client_plugin;
  mpvio->status= MPVIO_EXT::RESTART;
#endif

  DBUG_RETURN (0);
}

8403
#ifndef EMBEDDED_LIBRARY
8404 8405 8406 8407 8408 8409 8410 8411 8412 8413 8414 8415 8416 8417 8418 8419 8420 8421 8422 8423 8424 8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437 8438 8439 8440 8441 8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454 8455 8456 8457 8458 8459 8460 8461 8462 8463 8464 8465 8466 8467 8468 8469 8470 8471 8472 8473 8474 8475 8476 8477 8478 8479 8480 8481 8482 8483 8484 8485 8486 8487
/**
  Get a null character terminated string from a user-supplied buffer.

  @param buffer[in, out]    Pointer to the buffer to be scanned.
  @param max_bytes_available[in, out]  Limit the bytes to scan.
  @param string_length[out] The number of characters scanned not including
                            the null character.

  @remark The string_length does not include the terminating null character.
          However, after the call, the buffer is increased by string_length+1
          bytes, beyond the null character if there still available bytes to
          scan.

  @return pointer to beginning of the string scanned.
    @retval NULL The buffer content is malformed
*/

static
char *get_null_terminated_string(char **buffer,
                                 size_t *max_bytes_available,
                                 size_t *string_length)
{
  char *str= (char *)memchr(*buffer, '\0', *max_bytes_available);

  if (str == NULL)
    return NULL;

  *string_length= (size_t)(str - *buffer);
  *max_bytes_available-= *string_length + 1;
  str= *buffer;
  *buffer += *string_length + 1;  

  return str;
}

/**
  Get a length encoded string from a user-supplied buffer.

  @param buffer[in, out] The buffer to scan; updates position after scan.
  @param max_bytes_available[in, out] Limit the number of bytes to scan
  @param string_length[out] Number of characters scanned
  
  @remark In case the length is zero, then the total size of the string is
    considered to be 1 byte; the size byte.

  @return pointer to first byte after the header in buffer.
    @retval NULL The buffer content is malformed
*/

static
char *get_length_encoded_string(char **buffer,
                                size_t *max_bytes_available,
                                size_t *string_length)
{
  if (*max_bytes_available == 0)
    return NULL;

  /* Do double cast to prevent overflow from signed / unsigned conversion */
  size_t str_len= (size_t)(unsigned char)**buffer;

  /*
    If the length encoded string has the length 0
    the total size of the string is only one byte long (the size byte)
  */
  if (str_len == 0)
  {
    ++*buffer;
    *string_length= 0;
    /*
      Return a pointer to the 0 character so the return value will be
      an empty string.
    */
    return *buffer-1;
  }

  if (str_len >= *max_bytes_available)
    return NULL;

  char *str= *buffer+1;
  *string_length= str_len;
  *max_bytes_available-= *string_length + 1;
  *buffer+= *string_length + 1;
  return str;
}
8488
#endif
8489 8490


8491 8492 8493 8494 8495 8496 8497 8498 8499 8500 8501 8502 8503 8504 8505 8506 8507 8508 8509
/* the packet format is described in send_client_reply_packet() */
static ulong parse_client_handshake_packet(MPVIO_EXT *mpvio,
                                           uchar **buff, ulong pkt_len)
{
#ifndef EMBEDDED_LIBRARY
  NET *net= mpvio->net;
  char *end;

  DBUG_ASSERT(mpvio->status == MPVIO_EXT::FAILURE);

  if (pkt_len < MIN_HANDSHAKE_SIZE)
    return packet_error;

  if (mpvio->connect_errors)
    reset_host_errors(mpvio->ip);

  ulong client_capabilities= uint2korr(net->read_pos);
  if (client_capabilities & CLIENT_PROTOCOL_41)
  {
8510 8511
    client_capabilities|= ((ulong) uint2korr(net->read_pos + 2)) << 16;
    mpvio->max_client_packet_length= uint4korr(net->read_pos + 4);
8512 8513 8514
    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
    if (mpvio->charset_adapter->init_client_charset((uint) net->read_pos[8]))
      return packet_error;
8515
    end= (char*) net->read_pos + 32;
8516 8517 8518
  }
  else
  {
8519 8520
    mpvio->max_client_packet_length= uint3korr(net->read_pos + 2);
    end= (char*) net->read_pos + 5;
8521 8522 8523 8524 8525 8526 8527 8528 8529 8530 8531 8532 8533 8534 8535 8536 8537 8538 8539 8540 8541 8542 8543 8544 8545 8546 8547 8548 8549 8550 8551 8552 8553 8554
  }

  /* Disable those bits which are not supported by the client. */
  mpvio->client_capabilities&= client_capabilities;


#if defined(HAVE_OPENSSL)
  DBUG_PRINT("info", ("client capabilities: %lu", mpvio->client_capabilities));
  if (mpvio->client_capabilities & CLIENT_SSL)
  {
    char error_string[1024] __attribute__((unused));

    /* Do the SSL layering. */
    if (!ssl_acceptor_fd)
      return packet_error;

    DBUG_PRINT("info", ("IO layer change in progress..."));
    if (sslaccept(ssl_acceptor_fd, net->vio, net->read_timeout))
    {
      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
      return packet_error;
    }

    DBUG_PRINT("info", ("Reading user information over SSL layer"));
    pkt_len= my_net_read(net);
    if (pkt_len == packet_error || pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
      return packet_error;
    }
  }
#endif

8555
  if (end > (char *)net->read_pos + pkt_len)
8556 8557 8558 8559 8560
    return packet_error;

  if ((mpvio->client_capabilities & CLIENT_TRANSACTIONS) &&
      opt_using_transactions)
    net->return_status= mpvio->server_status;
8561 8562 8563 8564 8565 8566 8567
 
  /*
    In order to safely scan a head for '\0' string terminators
    we must keep track of how many bytes remain in the allocated
    buffer or we might read past the end of the buffer.
  */
  size_t bytes_remaining_in_packet= pkt_len - (end - (char *)net->read_pos);
8568

8569 8570 8571 8572 8573
  size_t user_len;
  char *user= get_null_terminated_string(&end, &bytes_remaining_in_packet,
                                         &user_len);
  if (user == NULL)
    return packet_error;
8574 8575

  /*
8576
    Old clients send a null-terminated string as password; new clients send
8577 8578 8579
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
8580 8581 8582 8583
  size_t passwd_len= 0;
  char *passwd= NULL;

  if (mpvio->client_capabilities & CLIENT_SECURE_CONNECTION)
8584
  {
8585 8586 8587 8588 8589
    /*
      4.1+ password. First byte is password length.
    */
    passwd= get_length_encoded_string(&end, &bytes_remaining_in_packet,
                                      &passwd_len);
8590 8591 8592
  }
  else
  {
8593 8594 8595 8596 8597
    /*
      Old passwords are zero terminated strings.
    */
    passwd= get_null_terminated_string(&end, &bytes_remaining_in_packet,
                                       &passwd_len);
8598 8599
  }

8600
  if (passwd == NULL)
8601 8602
    return packet_error;

8603 8604 8605 8606 8607 8608 8609 8610 8611 8612 8613 8614 8615 8616 8617 8618 8619 8620 8621 8622 8623 8624
  size_t db_len= 0;
  char *db= NULL;

  if (mpvio->client_capabilities & CLIENT_CONNECT_WITH_DB)
  {
    db= get_null_terminated_string(&end, &bytes_remaining_in_packet,
                                   &db_len);
    if (db == NULL)
      return packet_error;
  }

  size_t client_plugin_len= 0;
  char *client_plugin= get_null_terminated_string(&end,
                                                  &bytes_remaining_in_packet,
                                                  &client_plugin_len);
  if (client_plugin == NULL)
    client_plugin= &empty_c_string[0];
 
  char db_buff[NAME_LEN + 1];           // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	// buffer to store user in utf8
  uint dummy_errors;
  
8625 8626 8627 8628

  /* Since 4.1 all database names are stored in utf8 */
  if (db)
  {
8629 8630
    db_len= copy_and_convert(db_buff, sizeof(db_buff) - 1, system_charset_info,
                             db, db_len, mpvio->charset_adapter->charset(),
8631 8632 8633 8634 8635
                             &dummy_errors);
    db= db_buff;
    db_buff[db_len]= 0;
  }

8636
  user_len= copy_and_convert(user_buff, sizeof(user_buff) - 1,
8637
                                system_charset_info, user, user_len,
8638
                                mpvio->charset_adapter->charset(),
8639 8640 8641 8642 8643 8644 8645
                                &dummy_errors);
  user= user_buff;
  user_buff[user_len]= 0;

  /* If username starts and ends in "'", chop them off */
  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
  {
8646
    user[user_len - 1]= 0;
8647 8648 8649 8650 8651 8652 8653 8654 8655 8656 8657 8658 8659 8660 8661 8662 8663 8664 8665 8666 8667 8668 8669
    user++;
    user_len-= 2;
  }

  if (make_lex_string_root(mpvio->mem_root, 
                           &mpvio->db, db, db_len, 0) == 0)
    return packet_error; /* The error is set by make_lex_string(). */
  if (mpvio->auth_info.user_name)
    my_free(mpvio->auth_info.user_name);
  if (!(mpvio->auth_info.user_name= my_strndup(user, user_len, MYF(MY_WME))))
    return packet_error; /* The error is set by my_strdup(). */
  mpvio->auth_info.user_name_length= user_len;

  if (!initialized)
  {
    // if mysqld's been started with --skip-grant-tables option
    mpvio->status= MPVIO_EXT::SUCCESS;
    return packet_error;
  }

  if (find_mpvio_user(mpvio))
    return packet_error;

8670
  if (!(mpvio->client_capabilities & CLIENT_PLUGIN_AUTH))
8671
  {
8672 8673 8674
    /*
      An old client is connecting
    */
8675 8676 8677 8678
    if (mpvio->client_capabilities & CLIENT_SECURE_CONNECTION)
      client_plugin= native_password_plugin_name.str;
    else
    {
8679 8680 8681
      /*
        A really old client is connecting
      */
8682
      client_plugin= old_password_plugin_name.str;
8683 8684 8685 8686 8687 8688 8689 8690 8691 8692 8693 8694 8695 8696 8697 8698 8699 8700 8701 8702 8703 8704 8705 8706 8707 8708 8709 8710 8711 8712 8713 8714 8715 8716 8717 8718 8719
      /*
        For a passwordless accounts we use native_password_plugin.
        But when an old 4.0 client connects to it, we change it to
        old_password_plugin, otherwise MySQL will think that server 
        and client plugins don't match.
      */
      if (mpvio->acl_user->auth_string.length == 0)
        mpvio->acl_user_plugin= old_password_plugin_name;
    }
  }
  
  /*
    if the acl_user needs a different plugin to authenticate
    (specified in GRANT ... AUTHENTICATED VIA plugin_name ..)
    we need to restart the authentication in the server.
    But perhaps the client has already used the correct plugin -
    in that case the authentication on the client may not need to be
    restarted and a server auth plugin will read the data that the client
    has just send. Cache them to return in the next server_mpvio_read_packet().
  */
  if (my_strcasecmp(system_charset_info, mpvio->acl_user_plugin.str,
                    plugin_name(mpvio->plugin)->str) != 0)
  {
    mpvio->cached_client_reply.pkt= passwd;
    mpvio->cached_client_reply.pkt_len= passwd_len;
    mpvio->cached_client_reply.plugin= client_plugin;
    mpvio->status= MPVIO_EXT::RESTART;
    return packet_error;
  }

  /*
    ok, we don't need to restart the authentication on the server.
    but if the client used the wrong plugin, we need to restart
    the authentication on the client. Do it here, the server plugin
    doesn't need to know.
  */
  const char *client_auth_plugin=
8720
    ((st_mysql_auth *) (plugin_decl(mpvio->plugin)->info))->client_auth_plugin;
8721 8722 8723 8724 8725 8726

  if (client_auth_plugin &&
      my_strcasecmp(system_charset_info, client_plugin, client_auth_plugin))
  {
    mpvio->cached_client_reply.plugin= client_plugin;
    if (send_plugin_request_packet(mpvio,
8727
                                   (uchar*) mpvio->cached_server_packet.pkt,
8728 8729 8730 8731
                                   mpvio->cached_server_packet.pkt_len))
      return packet_error;

    passwd_len= my_net_read(mpvio->net);
8732
    passwd = (char*) mpvio->net->read_pos;
8733 8734
  }

8735
  *buff= (uchar*) passwd;
8736 8737 8738 8739 8740 8741 8742 8743 8744 8745 8746 8747 8748 8749 8750 8751 8752 8753 8754 8755 8756 8757 8758 8759 8760 8761
  return passwd_len;
#else
  return 0;
#endif
}


/**
  Make sure that when sending plugin supplued data to the client they
  are not considered a special out-of-band command, like e.g. 
  \255 (error) or \254 (change user request packet).
  To avoid this we send plugin data packets starting with one of these
  2 bytes "wrapped" in a command \1. 
  For the above reason we have to wrap plugin data packets starting with
  \1 as well.
*/

#define IS_OUT_OF_BAND_PACKET(packet,packet_len) \
  ((packet_len) > 0 && \
   (*(packet) == 1 || *(packet) == 255 || *(packet) == 254))

static inline int 
wrap_plguin_data_into_proper_command(NET *net, 
                                     const uchar *packet, int packet_len)
{
  DBUG_ASSERT(IS_OUT_OF_BAND_PACKET(packet, packet_len));
8762
  return net_write_command(net, 1, (uchar *) "", 0, packet, packet_len);
8763 8764 8765 8766 8767 8768 8769 8770 8771 8772 8773 8774 8775 8776 8777 8778
}


/**
  vio->write_packet() callback method for server authentication plugins

  This function is called by a server authentication plugin, when it wants
  to send data to the client.

  It transparently wraps the data into a handshake packet,
  and handles plugin negotiation with the client. If necessary,
  it escapes the plugin data, if it starts with a mysql protocol packet byte.
*/
static int server_mpvio_write_packet(MYSQL_PLUGIN_VIO *param,
                                   const uchar *packet, int packet_len)
{
8779
  MPVIO_EXT *mpvio= (MPVIO_EXT *) param;
8780 8781
  int res;

8782
  DBUG_ENTER("server_mpvio_write_packet");
8783 8784 8785 8786 8787 8788 8789 8790 8791 8792
  /* 
    Reset cached_client_reply if not an old client doing mysql_change_user, 
    as this is where the password from COM_CHANGE_USER is stored.
  */
  if (!((!(mpvio->client_capabilities & CLIENT_PLUGIN_AUTH)) && 
        mpvio->status == MPVIO_EXT::RESTART &&
        mpvio->cached_client_reply.plugin == 
        ((st_mysql_auth *) (plugin_decl(mpvio->plugin)->info))->client_auth_plugin
        ))
    mpvio->cached_client_reply.pkt= 0;
8793 8794
  /* for the 1st packet we wrap plugin data into the handshake packet */
  if (mpvio->packets_written == 0)
8795
    res= send_server_handshake_packet(mpvio, (char*) packet, packet_len);
8796 8797 8798 8799 8800 8801 8802 8803 8804 8805
  else if (mpvio->status == MPVIO_EXT::RESTART)
    res= send_plugin_request_packet(mpvio, packet, packet_len);
  else if (IS_OUT_OF_BAND_PACKET(packet, packet_len))
    res= wrap_plguin_data_into_proper_command(mpvio->net, packet, packet_len);
  else
  {
    res= my_net_write(mpvio->net, packet, packet_len) ||
         net_flush(mpvio->net);
  }
  mpvio->packets_written++;
8806
  DBUG_RETURN(res);
8807 8808 8809 8810 8811 8812 8813 8814 8815 8816 8817 8818 8819 8820
}

/**
  vio->read_packet() callback method for server authentication plugins

  This function is called by a server authentication plugin, when it wants
  to read data from the client.

  It transparently extracts the client plugin data, if embedded into
  a client authentication handshake packet, and handles plugin negotiation
  with the client, if necessary.
*/
static int server_mpvio_read_packet(MYSQL_PLUGIN_VIO *param, uchar **buf)
{
8821
  MPVIO_EXT *mpvio= (MPVIO_EXT *) param;
8822 8823
  ulong pkt_len;

8824
  DBUG_ENTER("server_mpvio_read_packet");
8825 8826 8827 8828 8829 8830 8831 8832 8833 8834 8835 8836 8837 8838 8839 8840 8841 8842 8843 8844 8845 8846
  if (mpvio->packets_written == 0)
  {
    /*
      plugin wants to read the data without sending anything first.
      send an empty packet to force a server handshake packet to be sent
    */
    if (mpvio->write_packet(mpvio, 0, 0))
      pkt_len= packet_error;
    else
      pkt_len= my_net_read(mpvio->net);
  }
  else if (mpvio->cached_client_reply.pkt)
  {
    DBUG_ASSERT(mpvio->status == MPVIO_EXT::RESTART);
    DBUG_ASSERT(mpvio->packets_read > 0);
    /*
      if the have the data cached from the last server_mpvio_read_packet
      (which can be the case if it's a restarted authentication)
      and a client has used the correct plugin, then we can return the
      cached data straight away and avoid one round trip.
    */
    const char *client_auth_plugin=
8847
      ((st_mysql_auth *) (plugin_decl(mpvio->plugin)->info))->client_auth_plugin;
8848 8849 8850 8851 8852
    if (client_auth_plugin == 0 ||
        my_strcasecmp(system_charset_info, mpvio->cached_client_reply.plugin,
                      client_auth_plugin) == 0)
    {
      mpvio->status= MPVIO_EXT::FAILURE;
8853
      *buf= (uchar*) mpvio->cached_client_reply.pkt;
8854 8855
      mpvio->cached_client_reply.pkt= 0;
      mpvio->packets_read++;
8856
      DBUG_RETURN ((int) mpvio->cached_client_reply.pkt_len);
8857
    }
8858 8859 8860 8861 8862 8863 8864 8865 8866

    /* older clients don't support change of client plugin request */
    if (!(mpvio->client_capabilities & CLIENT_PLUGIN_AUTH))
    {
      mpvio->status= MPVIO_EXT::FAILURE;
      pkt_len= packet_error;
      goto err;
    }

8867 8868 8869 8870 8871 8872 8873 8874 8875 8876 8877 8878 8879 8880 8881 8882 8883 8884 8885 8886 8887 8888 8889 8890 8891 8892 8893 8894 8895
    /*
      But if the client has used the wrong plugin, the cached data are
      useless. Furthermore, we have to send a "change plugin" request
      to the client.
    */
    if (mpvio->write_packet(mpvio, 0, 0))
      pkt_len= packet_error;
    else
      pkt_len= my_net_read(mpvio->net);
  }
  else
    pkt_len= my_net_read(mpvio->net);

  if (pkt_len == packet_error)
    goto err;

  mpvio->packets_read++;

  /*
    the 1st packet has the plugin data wrapped into the client authentication
    handshake packet
  */
  if (mpvio->packets_read == 1)
  {
    pkt_len= parse_client_handshake_packet(mpvio, buf, pkt_len);
    if (pkt_len == packet_error)
      goto err;
  }
  else
8896
    *buf= mpvio->net->read_pos;
8897

8898
  DBUG_RETURN((int)pkt_len);
8899 8900 8901 8902 8903 8904 8905

err:
  if (mpvio->status == MPVIO_EXT::FAILURE)
  {
    inc_host_errors(mpvio->ip);
    my_error(ER_HANDSHAKE_ERROR, MYF(0), mpvio->auth_info.host_or_ip);
  }
8906
  DBUG_RETURN(-1);
8907 8908 8909 8910 8911 8912 8913 8914 8915
}

/**
  fills MYSQL_PLUGIN_VIO_INFO structure with the information about the
  connection
*/
static void server_mpvio_info(MYSQL_PLUGIN_VIO *vio,
                              MYSQL_PLUGIN_VIO_INFO *info)
{
8916
  MPVIO_EXT *mpvio= (MPVIO_EXT *) vio;
8917 8918 8919
  mpvio_info(mpvio->net->vio, info);
}

8920
#ifndef NO_EMBEDDED_ACCESS_CHECKS
8921 8922 8923
static bool acl_check_ssl(THD *thd, const ACL_USER *acl_user)
{
#if defined(HAVE_OPENSSL)
8924 8925
  Vio *vio= thd->net.vio;
  SSL *ssl= (SSL *) vio->ssl_arg;
8926 8927 8928 8929 8930 8931 8932 8933 8934 8935 8936 8937 8938 8939 8940 8941 8942 8943 8944 8945 8946 8947 8948 8949 8950 8951 8952 8953 8954 8955 8956 8957 8958 8959 8960 8961 8962 8963 8964
  X509 *cert;
#endif

  /*
    At this point we know that user is allowed to connect
    from given host by given username/password pair. Now
    we check if SSL is required, if user is using SSL and
    if X509 certificate attributes are OK
  */
  switch (acl_user->ssl_type) {
  case SSL_TYPE_NOT_SPECIFIED:                  // Impossible
  case SSL_TYPE_NONE:                           // SSL is not required
    return 0;
#if defined(HAVE_OPENSSL)
  case SSL_TYPE_ANY:                            // Any kind of SSL is ok
    return vio_type(vio) != VIO_TYPE_SSL;
  case SSL_TYPE_X509: /* Client should have any valid certificate. */
    /*
      Connections with non-valid certificates are dropped already
      in sslaccept() anyway, so we do not check validity here.

      We need to check for absence of SSL because without SSL
      we should reject connection.
    */
    if (vio_type(vio) == VIO_TYPE_SSL &&
        SSL_get_verify_result(ssl) == X509_V_OK &&
        (cert= SSL_get_peer_certificate(ssl)))
    {
      X509_free(cert);
      return 0;
    }
    return 1;
  case SSL_TYPE_SPECIFIED: /* Client should have specified attrib */
    /* If a cipher name is specified, we compare it to actual cipher in use. */
    if (vio_type(vio) != VIO_TYPE_SSL ||
        SSL_get_verify_result(ssl) != X509_V_OK)
      return 1;
    if (acl_user->ssl_cipher)
    {
8965 8966 8967
      DBUG_PRINT("info", ("comparing ciphers: '%s' and '%s'",
                         acl_user->ssl_cipher, SSL_get_cipher(ssl)));
      if (strcmp(acl_user->ssl_cipher, SSL_get_cipher(ssl)))
8968 8969 8970 8971 8972 8973 8974 8975 8976 8977 8978 8979 8980
      {
        if (global_system_variables.log_warnings)
          sql_print_information("X509 ciphers mismatch: should be '%s' but is '%s'",
                            acl_user->ssl_cipher, SSL_get_cipher(ssl));
        return 1;
      }
    }
    /* Prepare certificate (if exists) */
    if (!(cert= SSL_get_peer_certificate(ssl)))
      return 1;
    /* If X509 issuer is specified, we check it... */
    if (acl_user->x509_issuer)
    {
8981 8982
      char *ptr= X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
      DBUG_PRINT("info", ("comparing issuers: '%s' and '%s'",
8983 8984 8985 8986 8987 8988 8989 8990 8991 8992 8993 8994 8995 8996 8997 8998
                         acl_user->x509_issuer, ptr));
      if (strcmp(acl_user->x509_issuer, ptr))
      {
        if (global_system_variables.log_warnings)
          sql_print_information("X509 issuer mismatch: should be '%s' "
                            "but is '%s'", acl_user->x509_issuer, ptr);
        free(ptr);
        X509_free(cert);
        return 1;
      }
      free(ptr);
    }
    /* X509 subject is specified, we check it .. */
    if (acl_user->x509_subject)
    {
      char *ptr= X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
8999
      DBUG_PRINT("info", ("comparing subjects: '%s' and '%s'",
9000
                         acl_user->x509_subject, ptr));
9001
      if (strcmp(acl_user->x509_subject, ptr))
9002 9003 9004 9005 9006 9007 9008 9009 9010 9011 9012 9013 9014 9015 9016 9017 9018 9019 9020 9021 9022 9023 9024
      {
        if (global_system_variables.log_warnings)
          sql_print_information("X509 subject mismatch: should be '%s' but is '%s'",
                          acl_user->x509_subject, ptr);
        free(ptr);
        X509_free(cert);
        return 1;
      }
      free(ptr);
    }
    X509_free(cert);
    return 0;
#else  /* HAVE_OPENSSL */
  default:
    /*
      If we don't have SSL but SSL is required for this user the 
      authentication should fail.
    */
    return 1;
#endif /* HAVE_OPENSSL */
  }
  return 1;
}
9025
#endif
9026 9027 9028 9029 9030 9031 9032 9033 9034 9035 9036 9037 9038 9039 9040 9041 9042 9043 9044 9045 9046 9047 9048 9049 9050 9051 9052


static int do_auth_once(THD *thd, const LEX_STRING *auth_plugin_name,
                        MPVIO_EXT *mpvio)
{
  int res= CR_OK, old_status= MPVIO_EXT::FAILURE;
  bool unlock_plugin= false;
  plugin_ref plugin;

  if (auth_plugin_name->str == native_password_plugin_name.str)
    plugin= native_password_plugin;
  else
#ifndef EMBEDDED_LIBRARY
  if (auth_plugin_name->str == old_password_plugin_name.str)
    plugin= old_password_plugin;
  else if ((plugin= my_plugin_lock_by_name(thd, auth_plugin_name,
                                           MYSQL_AUTHENTICATION_PLUGIN)))
    unlock_plugin= true;
  else
#endif
    plugin= NULL;
    
  mpvio->plugin= plugin;
  old_status= mpvio->status;
  
  if (plugin)
  {
9053
    st_mysql_auth *auth= (st_mysql_auth *) plugin_decl(plugin)->info;
9054 9055 9056 9057 9058 9059 9060 9061 9062 9063 9064 9065 9066 9067 9068 9069 9070 9071 9072 9073 9074 9075 9076 9077 9078 9079 9080 9081 9082 9083 9084 9085 9086 9087 9088 9089 9090
    res= auth->authenticate_user(mpvio, &mpvio->auth_info);

    if (unlock_plugin)
      plugin_unlock(thd, plugin);
  }
  else
  {
    /* Server cannot load the required plugin. */
    my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), auth_plugin_name->str);
    res= CR_ERROR;
  }

  /*
    If the status was MPVIO_EXT::RESTART before the authenticate_user() call
    it can never be MPVIO_EXT::RESTART after the call, because any call
    to write_packet() or read_packet() will reset the status.

    But (!) if a plugin never called a read_packet() or write_packet(), the
    status will stay unchanged. We'll fix it, by resetting the status here.
  */
  if (old_status == MPVIO_EXT::RESTART && mpvio->status == MPVIO_EXT::RESTART)
    mpvio->status= MPVIO_EXT::FAILURE; // reset to the default

  return res;
}


static void
server_mpvio_initialize(THD *thd, MPVIO_EXT *mpvio, uint connect_errors,
                        Thd_charset_adapter *charset_adapter)
{
  memset(mpvio, 0, sizeof(MPVIO_EXT));
  mpvio->read_packet= server_mpvio_read_packet;
  mpvio->write_packet= server_mpvio_write_packet;
  mpvio->info= server_mpvio_info;
  mpvio->auth_info.host_or_ip= thd->security_ctx->host_or_ip;
  mpvio->auth_info.host_or_ip_length= 
9091
    (unsigned int) strlen(thd->security_ctx->host_or_ip);
9092 9093
  mpvio->auth_info.user_name= NULL;
  mpvio->auth_info.user_name_length= 0;
9094 9095 9096 9097 9098 9099 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109 9110 9111 9112 9113 9114 9115 9116 9117 9118 9119 9120 9121 9122 9123 9124 9125 9126 9127 9128 9129 9130 9131 9132 9133 9134 9135 9136 9137 9138 9139 9140 9141 9142 9143 9144 9145 9146
  mpvio->connect_errors= connect_errors;
  mpvio->status= MPVIO_EXT::FAILURE;

  mpvio->client_capabilities= thd->client_capabilities;
  mpvio->mem_root= thd->mem_root;
  mpvio->scramble= thd->scramble;
  mpvio->rand= &thd->rand;
  mpvio->thread_id= thd->thread_id;
  mpvio->server_status= &thd->server_status;
  mpvio->net= &thd->net;
  mpvio->ip= thd->security_ctx->ip;
  mpvio->host= thd->security_ctx->host;
  mpvio->charset_adapter= charset_adapter;
}


static void
server_mpvio_update_thd(THD *thd, MPVIO_EXT *mpvio)
{
  thd->client_capabilities= mpvio->client_capabilities;
  thd->max_client_packet_length= mpvio->max_client_packet_length;
  if (mpvio->client_capabilities & CLIENT_INTERACTIVE)
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
  thd->security_ctx->user= mpvio->auth_info.user_name;
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
}

/**
  Perform the handshake, authorize the client and update thd sctx variables.

  @param thd                     thread handle
  @param connect_errors          number of previous failed connect attemps
                                 from this host
  @param com_change_user_pkt_len size of the COM_CHANGE_USER packet
                                 (without the first, command, byte) or 0
                                 if it's not a COM_CHANGE_USER (that is, if
                                 it's a new connection)

  @retval 0  success, thd is updated.
  @retval 1  error
*/
bool 
acl_authenticate(THD *thd, uint connect_errors, uint com_change_user_pkt_len)
{
  int res= CR_OK;
  MPVIO_EXT mpvio;
  Thd_charset_adapter charset_adapter(thd);

  const LEX_STRING *auth_plugin_name= default_auth_plugin_name;
  enum  enum_server_command command= com_change_user_pkt_len ? COM_CHANGE_USER
                                                             : COM_CONNECT;

9147
  DBUG_ENTER("acl_authenticate");
9148 9149 9150 9151
  compile_time_assert(MYSQL_USERNAME_LENGTH == USERNAME_LENGTH);

  server_mpvio_initialize(thd, &mpvio, connect_errors, &charset_adapter);

9152
  DBUG_PRINT("info", ("com_change_user_pkt_len=%u", com_change_user_pkt_len));
9153 9154 9155 9156 9157 9158 9159 9160 9161 9162 9163 9164 9165 9166 9167 9168 9169 9170 9171 9172 9173 9174 9175 9176 9177 9178 9179 9180 9181 9182 9183 9184 9185 9186 9187 9188 9189 9190 9191 9192 9193 9194 9195 9196 9197 9198

  /*
    Clear thd->db as it points to something, that will be freed when
    connection is closed. We don't want to accidentally free a wrong
    pointer if connect failed.
  */
  thd->reset_db(NULL, 0);

  if (command == COM_CHANGE_USER)
  {
    mpvio.packets_written++; // pretend that a server handshake packet was sent
    mpvio.packets_read++;    // take COM_CHANGE_USER packet into account

    /* Clear variables that are allocated */
    thd->user_connect= 0;

    if (parse_com_change_user_packet(&mpvio, com_change_user_pkt_len))
    {
      server_mpvio_update_thd(thd, &mpvio);
      DBUG_RETURN(1);
    }

    DBUG_ASSERT(mpvio.status == MPVIO_EXT::RESTART ||
                mpvio.status == MPVIO_EXT::SUCCESS);
  }
  else
  {
    /* mark the thd as having no scramble yet */
    mpvio.scramble[SCRAMBLE_LENGTH]= 1;
    
    /*
     perform the first authentication attempt, with the default plugin.
     This sends the server handshake packet, reads the client reply
     with a user name, and performs the authentication if everyone has used
     the correct plugin.
    */

    res= do_auth_once(thd, auth_plugin_name, &mpvio);  
  }

  /*
   retry the authentication, if - after receiving the user name -
   we found that we need to switch to a non-default plugin
  */
  if (mpvio.status == MPVIO_EXT::RESTART)
  {
9199
    DBUG_ASSERT(mpvio.acl_user);
9200 9201 9202 9203
    DBUG_ASSERT(command == COM_CHANGE_USER ||
                my_strcasecmp(system_charset_info, auth_plugin_name->str,
                              mpvio.acl_user->plugin.str));
    auth_plugin_name= &mpvio.acl_user->plugin;
9204
    res= do_auth_once(thd, auth_plugin_name, &mpvio);
9205 9206 9207 9208 9209 9210 9211 9212 9213 9214 9215 9216 9217 9218 9219 9220 9221 9222 9223 9224 9225 9226 9227 9228 9229 9230 9231 9232 9233 9234 9235 9236 9237 9238 9239 9240 9241 9242 9243 9244 9245 9246 9247 9248 9249 9250
  }

  server_mpvio_update_thd(thd, &mpvio);

  Security_context *sctx= thd->security_ctx;
  const ACL_USER *acl_user= mpvio.acl_user;

  thd->password= mpvio.auth_info.password_used;  // remember for error messages 

  /*
    Log the command here so that the user can check the log
    for the tried logins and also to detect break-in attempts.

    if sctx->user is unset it's protocol failure, bad packet.
  */
  if (mpvio.auth_info.user_name)
  {
    if (strcmp(mpvio.auth_info.authenticated_as, mpvio.auth_info.user_name))
    {
      general_log_print(thd, command, "%s@%s as %s on %s",
                        mpvio.auth_info.user_name, mpvio.auth_info.host_or_ip,
                        mpvio.auth_info.authenticated_as ? 
                          mpvio.auth_info.authenticated_as : "anonymous",
                        mpvio.db.str ? mpvio.db.str : (char*) "");
    }
    else
      general_log_print(thd, command, (char*) "%s@%s on %s",
                        mpvio.auth_info.user_name, mpvio.auth_info.host_or_ip,
                        mpvio.db.str ? mpvio.db.str : (char*) "");
  }

  if (res > CR_OK && mpvio.status != MPVIO_EXT::SUCCESS)
  {
    DBUG_ASSERT(mpvio.status == MPVIO_EXT::FAILURE);

    if (!thd->is_error())
      login_failed_error(&mpvio, mpvio.auth_info.password_used);
    DBUG_RETURN (1);
  }

  sctx->proxy_user[0]= 0;

  if (initialized) // if not --skip-grant-tables
  {
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    bool is_proxy_user= FALSE;
9251 9252
    const char *auth_user = acl_user->user ? acl_user->user : "";
    ACL_PROXY_USER *proxy_user;
9253
    /* check if the user is allowed to proxy as another user */
9254 9255 9256 9257
    proxy_user= acl_find_proxy_user(auth_user, sctx->host, sctx->ip,
                                    mpvio.auth_info.authenticated_as,
                                          &is_proxy_user);
    if (is_proxy_user)
9258
    {
9259 9260 9261 9262 9263 9264 9265 9266 9267
      ACL_USER *acl_proxy_user;

      /* we need to find the proxy user, but there was none */
      if (!proxy_user)
      {
        if (!thd->is_error())
          login_failed_error(&mpvio, mpvio.auth_info.password_used);
        DBUG_RETURN(1);
      }
9268

9269
      my_snprintf(sctx->proxy_user, sizeof(sctx->proxy_user) - 1,
9270 9271
                  "'%s'@'%s'", auth_user,
                  acl_user->host.hostname ? acl_user->host.hostname : "");
9272 9273 9274 9275 9276 9277 9278 9279 9280 9281 9282 9283 9284 9285 9286 9287

      /* we're proxying : find the proxy user definition */
      mysql_mutex_lock(&acl_cache->lock);
      acl_proxy_user= find_acl_user(proxy_user->get_proxied_host() ? 
                                    proxy_user->get_proxied_host() : "",
                                    mpvio.auth_info.authenticated_as, TRUE);
      if (!acl_proxy_user)
      {
        if (!thd->is_error())
          login_failed_error(&mpvio, mpvio.auth_info.password_used);
        mysql_mutex_unlock(&acl_cache->lock);
        DBUG_RETURN(1);
      }
      acl_user= acl_proxy_user->copy(thd->mem_root);
      mysql_mutex_unlock(&acl_cache->lock);
    }
9288 9289 9290
#endif

    sctx->master_access= acl_user->access;
9291 9292 9293 9294 9295
    if (acl_user->user)
      strmake(sctx->priv_user, acl_user->user, USERNAME_LENGTH - 1);
    else
      *sctx->priv_user= 0;

9296 9297 9298 9299 9300 9301 9302 9303 9304 9305 9306 9307 9308 9309 9310
    if (acl_user->host.hostname)
      strmake(sctx->priv_host, acl_user->host.hostname, MAX_HOSTNAME - 1);
    else
      *sctx->priv_host= 0;

#ifndef NO_EMBEDDED_ACCESS_CHECKS
    /*
      OK. Let's check the SSL. Historically it was checked after the password,
      as an additional layer, not instead of the password
      (in which case it would've been a plugin too).
    */
    if (acl_check_ssl(thd, acl_user))
    {
      if (!thd->is_error())
        login_failed_error(&mpvio, thd->password);
9311
      DBUG_RETURN(1);
9312 9313 9314 9315 9316 9317 9318 9319 9320 9321 9322
    }

    /* Don't allow the user to connect if he has done too many queries */
    if ((acl_user->user_resource.questions || acl_user->user_resource.updates ||
         acl_user->user_resource.conn_per_hour ||
         acl_user->user_resource.user_conn || 
         global_system_variables.max_user_connections) &&
        get_or_create_user_conn(thd,
          (opt_old_style_user_limits ? sctx->user : sctx->priv_user),
          (opt_old_style_user_limits ? sctx->host_or_ip : sctx->priv_host),
          &acl_user->user_resource))
9323
      DBUG_RETURN(1); // The error is set by get_or_create_user_conn()
9324 9325 9326 9327 9328 9329 9330 9331 9332 9333 9334 9335

#endif
  }
  else
    sctx->skip_grants();

  if (thd->user_connect &&
      (thd->user_connect->user_resources.conn_per_hour ||
       thd->user_connect->user_resources.user_conn ||
       global_system_variables.max_user_connections) &&
      check_for_max_user_connections(thd, thd->user_connect))
  {
9336
    DBUG_RETURN(1); // The error is set in check_for_max_user_connections()
9337 9338 9339 9340 9341 9342 9343 9344 9345 9346 9347 9348 9349 9350 9351 9352 9353 9354 9355 9356
  }

  DBUG_PRINT("info",
             ("Capabilities: %lu  packet_length: %ld  Host: '%s'  "
              "Login user: '%s' Priv_user: '%s'  Using password: %s "
              "Access: %lu  db: '%s'",
              thd->client_capabilities, thd->max_client_packet_length,
              sctx->host_or_ip, sctx->user, sctx->priv_user,
              thd->password ? "yes": "no",
              sctx->master_access, mpvio.db.str));

  if (command == COM_CONNECT &&
      !(thd->main_security_ctx.master_access & SUPER_ACL))
  {
    mysql_mutex_lock(&LOCK_connection_count);
    bool count_ok= (connection_count <= max_connections);
    mysql_mutex_unlock(&LOCK_connection_count);
    if (!count_ok)
    {                                         // too many connections
      my_error(ER_CON_COUNT_ERROR, MYF(0));
9357
      DBUG_RETURN(1);
9358 9359 9360 9361 9362 9363 9364 9365 9366 9367 9368 9369 9370 9371 9372 9373 9374 9375 9376 9377 9378
    }
  }

  /*
    This is the default access rights for the current database.  It's
    set to 0 here because we don't have an active database yet (and we
    may not have an active database to set.
  */
  sctx->db_access=0;

  /* Change a database if necessary */
  if (mpvio.db.length)
  {
    if (mysql_change_db(thd, &mpvio.db, FALSE))
    {
      /* mysql_change_db() has pushed the error message. */
      if (thd->user_connect)
      {
        decrease_user_connections(thd->user_connect);
        thd->user_connect= 0;
      }
9379
      DBUG_RETURN(1);
9380 9381 9382 9383 9384 9385 9386 9387 9388 9389 9390 9391 9392 9393 9394 9395 9396 9397 9398 9399 9400 9401
    }
  }

  if (mpvio.auth_info.external_user[0])
    sctx->external_user= my_strdup(mpvio.auth_info.external_user, MYF(0));

  if (res == CR_OK_HANDSHAKE_COMPLETE)
    thd->stmt_da->disable_status();
  else
    my_ok(thd);

#if defined(MYSQL_SERVER) && !defined(EMBEDDED_LIBRARY)
  /*
    Allow the network layer to skip big packets. Although a malicious
    authenticated session might use this to trick the server to read
    big packets indefinitely, this is a previously established behavior
    that needs to be preserved as to not break backwards compatibility.
  */
  thd->net.skip_big_packet= TRUE;
#endif

  /* Ready to handle queries */
9402
  DBUG_RETURN(0);
9403 9404 9405 9406 9407 9408 9409 9410 9411 9412
}

/**
  MySQL Server Password Authentication Plugin

  In the MySQL authentication protocol:
  1. the server sends the random scramble to the client
  2. client sends the encrypted password back to the server
  3. the server checks the password.
*/
9413 9414
static int native_password_authenticate(MYSQL_PLUGIN_VIO *vio,
                                        MYSQL_SERVER_AUTH_INFO *info)
9415 9416 9417
{
  uchar *pkt;
  int pkt_len;
9418
  MPVIO_EXT *mpvio= (MPVIO_EXT *) vio;
9419

9420
  DBUG_ENTER("native_password_authenticate");
9421 9422 9423 9424 9425 9426

  /* generate the scramble, or reuse the old one */
  if (mpvio->scramble[SCRAMBLE_LENGTH])
    create_random_string(mpvio->scramble, SCRAMBLE_LENGTH, mpvio->rand);

  /* send it to the client */
9427
  if (mpvio->write_packet(mpvio, (uchar*) mpvio->scramble, SCRAMBLE_LENGTH + 1))
9428
    DBUG_RETURN(CR_ERROR);
9429 9430 9431 9432 9433 9434 9435 9436 9437 9438 9439 9440 9441 9442 9443 9444 9445 9446 9447 9448 9449 9450 9451 9452 9453 9454 9455 9456 9457 9458 9459 9460 9461 9462 9463 9464 9465 9466 9467 9468

  /* reply and authenticate */

  /*
    <digression>
      This is more complex than it looks.

      The plugin (we) may be called right after the client was connected -
      and will need to send a scramble, read reply, authenticate.

      Or the plugin may be called after another plugin has sent a scramble,
      and read the reply. If the client has used the correct client-plugin,
      we won't need to read anything here from the client, the client
      has already sent a reply with everything we need for authentication.

      Or the plugin may be called after another plugin has sent a scramble,
      and read the reply, but the client has used the wrong client-plugin.
      We'll need to sent a "switch to another plugin" packet to the
      client and read the reply. "Use the short scramble" packet is a special
      case of "switch to another plugin" packet.

      Or, perhaps, the plugin may be called after another plugin has
      done the handshake but did not send a useful scramble. We'll need
      to send a scramble (and perhaps a "switch to another plugin" packet)
      and read the reply.

      Besides, a client may be an old one, that doesn't understand plugins.
      Or doesn't even understand 4.0 scramble.

      And we want to keep the same protocol on the wire  unless non-native
      plugins are involved.

      Anyway, it still looks simple from a plugin point of view:
      "send the scramble, read the reply and authenticate"
      All the magic is transparently handled by the server.
    </digression>
  */

  /* read the reply with the encrypted password */
  if ((pkt_len= mpvio->read_packet(mpvio, &pkt)) < 0)
9469 9470
    DBUG_RETURN(CR_ERROR);
  DBUG_PRINT("info", ("reply read : pkt_len=%d", pkt_len));
9471 9472

#ifdef NO_EMBEDDED_ACCESS_CHECKS
9473
  DBUG_RETURN(CR_OK);
9474 9475 9476
#endif

  if (pkt_len == 0) /* no password */
9477
    DBUG_RETURN(info->auth_string[0] ? CR_ERROR : CR_OK);
9478

9479
  info->password_used= PASSWORD_USED_YES;
9480 9481 9482 9483 9484
  if (pkt_len == SCRAMBLE_LENGTH)
  {
    if (!mpvio->acl_user->salt_len)
      DBUG_RETURN(CR_ERROR);

9485 9486
    DBUG_RETURN(check_scramble(pkt, mpvio->scramble, mpvio->acl_user->salt) ?
                CR_ERROR : CR_OK);
9487 9488 9489 9490
  }

  inc_host_errors(mpvio->ip);
  my_error(ER_HANDSHAKE_ERROR, MYF(0), mpvio->auth_info.host_or_ip);
9491
  DBUG_RETURN(CR_ERROR);
9492 9493 9494
}

static int old_password_authenticate(MYSQL_PLUGIN_VIO *vio, 
9495
                                     MYSQL_SERVER_AUTH_INFO *info)
9496 9497 9498
{
  uchar *pkt;
  int pkt_len;
9499
  MPVIO_EXT *mpvio= (MPVIO_EXT *) vio;
9500 9501 9502 9503 9504 9505

  /* generate the scramble, or reuse the old one */
  if (mpvio->scramble[SCRAMBLE_LENGTH])
    create_random_string(mpvio->scramble, SCRAMBLE_LENGTH, mpvio->rand);

  /* send it to the client */
9506
  if (mpvio->write_packet(mpvio, (uchar*) mpvio->scramble, SCRAMBLE_LENGTH + 1))
9507 9508 9509 9510 9511 9512 9513 9514 9515 9516 9517 9518 9519 9520 9521
    return CR_ERROR;

  /* read the reply and authenticate */
  if ((pkt_len= mpvio->read_packet(mpvio, &pkt)) < 0)
    return CR_ERROR;

#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return CR_OK;
#endif

  /*
    legacy: if switch_from_long_to_short_scramble,
    the password is sent \0-terminated, the pkt_len is always 9 bytes.
    We need to figure out the correct scramble length here.
  */
9522
  if (pkt_len == SCRAMBLE_LENGTH_323 + 1)
9523 9524 9525 9526 9527 9528 9529 9530
    pkt_len= strnlen((char*)pkt, pkt_len);

  if (pkt_len == 0) /* no password */
    return info->auth_string[0] ? CR_ERROR : CR_OK;

  if (secure_auth(mpvio))
    return CR_ERROR;

9531
  info->password_used= PASSWORD_USED_YES;
9532 9533 9534 9535 9536 9537 9538

  if (pkt_len == SCRAMBLE_LENGTH_323)
  {
    if (!mpvio->acl_user->salt_len)
      return CR_ERROR;

    return check_scramble_323(pkt, mpvio->scramble,
9539 9540
                             (ulong *) mpvio->acl_user->salt) ? 
                             CR_ERROR : CR_OK;
9541 9542 9543 9544 9545 9546 9547 9548 9549 9550 9551 9552 9553 9554 9555 9556 9557 9558 9559 9560 9561 9562 9563 9564 9565 9566 9567 9568 9569 9570 9571 9572 9573 9574 9575 9576 9577 9578 9579 9580 9581 9582 9583 9584 9585 9586 9587 9588 9589 9590 9591 9592
  }

  inc_host_errors(mpvio->ip);
  my_error(ER_HANDSHAKE_ERROR, MYF(0), mpvio->auth_info.host_or_ip);
  return CR_ERROR;
}

static struct st_mysql_auth native_password_handler=
{
  MYSQL_AUTHENTICATION_INTERFACE_VERSION,
  native_password_plugin_name.str,
  native_password_authenticate
};

static struct st_mysql_auth old_password_handler=
{
  MYSQL_AUTHENTICATION_INTERFACE_VERSION,
  old_password_plugin_name.str,
  old_password_authenticate
};

mysql_declare_plugin(mysql_password)
{
  MYSQL_AUTHENTICATION_PLUGIN,                  /* type constant    */
  &native_password_handler,                     /* type descriptor  */
  native_password_plugin_name.str,              /* Name             */
  "R.J.Silk, Sergei Golubchik",                 /* Author           */
  "Native MySQL authentication",                /* Description      */
  PLUGIN_LICENSE_GPL,                           /* License          */
  NULL,                                         /* Init function    */
  NULL,                                         /* Deinit function  */
  0x0100,                                       /* Version (1.0)    */
  NULL,                                         /* status variables */
  NULL,                                         /* system variables */
  NULL                                          /* config options   */
},
{
  MYSQL_AUTHENTICATION_PLUGIN,                  /* type constant    */
  &old_password_handler,                        /* type descriptor  */
  old_password_plugin_name.str,                 /* Name             */
  "R.J.Silk, Sergei Golubchik",                 /* Author           */
  "Old MySQL-4.0 authentication",               /* Description      */
  PLUGIN_LICENSE_GPL,                           /* License          */
  NULL,                                         /* Init function    */
  NULL,                                         /* Deinit function  */
  0x0100,                                       /* Version (1.0)    */
  NULL,                                         /* status variables */
  NULL,                                         /* system variables */
  NULL                                          /* config options   */
}
mysql_declare_plugin_end;