New authentication plugin for authentication via named pipe on Windows

operating systems.

The plugin gets the sid of the client process and considers the user
authenticated if the given username matches the username of this sid.

plugin/auth_pipe/CMakeLists.txt

+# Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+# 
+# 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 the Free Software Foundation; version 2 of the
+# License.
+# 
+# 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.
+# 
+# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
+
+IF(WIN32)
+  MYSQL_ADD_PLUGIN(auth_pipe auth_pipe.c MODULE_ONLY)
+ENDIF()

plugin/auth_pipe/auth_pipe.c

+/* Copyright (C) 2015 Vladislav Vaintroub, Georg Richter and Monty Program Ab
+    
+    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 the Free Software Foundation; version 2 of the
+    License.
+    
+    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.
+    
+    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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
+
+/**
+  @file
+
+  auth_pipd authentication plugin.
+
+  Authentication is successful if the connection is done via a named pip and
+  the owner of the client process matches the user name that was used when
+  connecting to mysqld.
+*/
+
+
+#include <mysql/plugin_auth.h>
+#include <string.h>
+#include <lmcons.h>
+
+
+
+
+
+/**
+  perform the named pipe´based authentication
+
+  This authentication callback performs a named pipe based authentication -
+  it gets the uid of the client process and considers the user authenticated
+  if it uses username of this uid. That is - if the user is already
+  authenticated to the OS (if she is logged in) - she can use MySQL as herself
+*/
+
+static int pipe_auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
+{
+  unsigned char *pkt;
+  PTOKEN_USER pTokenUser= NULL;
+  HANDLE hToken;
+  MYSQL_PLUGIN_VIO_INFO vio_info;
+  DWORD dLength= 0;
+  int Ret= CR_ERROR;
+  TCHAR username[UNLEN + 1];
+  DWORD username_length= UNLEN + 1;
+  char domainname[DNLEN + 1];
+  DWORD domainsize=DNLEN + 1;
+  SID_NAME_USE sidnameuse;
+
+  /* no user name yet ? read the client handshake packet with the user name */
+  if (info->user_name == 0)
+  {
+    if (vio->read_packet(vio, &pkt) < 0)
+      return CR_ERROR;
+  }
+
+  info->password_used= PASSWORD_USED_NO_MENTION;
+
+  vio->info(vio, &vio_info);
+  if (vio_info.protocol != MYSQL_VIO_PIPE)
+    return CR_ERROR;
+
+  /* get the UID of the client process */
+  if (!ImpersonateNamedPipeClient(vio_info.handle))
+    return CR_ERROR;
+  
+  if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &hToken))
+    goto end;
+   
+ /* determine length of TokenUser */
+ GetTokenInformation(hToken, TokenUser, NULL, 0, &dLength);
+ if (!dLength)
+   goto end;
+
+ if (!(pTokenUser= (PTOKEN_USER)LocalAlloc(0, dLength)))
+   goto end;
+
+ if (!GetTokenInformation(hToken, TokenUser, (PVOID)pTokenUser, dLength, &dLength))
+   goto end;
+
+ if (!LookupAccountSid(NULL, pTokenUser->User.Sid, username, &username_length, domainname, &domainsize, &sidnameuse))
+   goto end;
+
+ Ret= strcmp(username, info->user_name) ? CR_ERROR : CR_OK;
+end:
+  if (pTokenUser)
+    LocalFree(pTokenUser);
+  RevertToSelf();
+  /* now it's simple as that */
+  return Ret;
+}
+
+static struct st_mysql_auth pipe_auth_handler=
+{
+  MYSQL_AUTHENTICATION_INTERFACE_VERSION,
+  0,
+  pipe_auth
+};
+
+maria_declare_plugin(socket_auth)
+{
+  MYSQL_AUTHENTICATION_PLUGIN,
+  &pipe_auth_handler,
+  "windows_pipe",
+  "Vladislav Vaintroub, Georg Richter",
+  "Windows named pipe based authentication",
+  PLUGIN_LICENSE_GPL,
+  NULL,
+  NULL,
+  0x0100,
+  NULL,
+  NULL,
+  "1.0",
+  MariaDB_PLUGIN_MATURITY_STABLE
+}
+maria_declare_plugin_end;
+