Commit a92f6574 authored by Łukasz Nowak's avatar Łukasz Nowak

Feature/whitelist firewall

See merge request nexedi/slapos.core!285
parents 439b3313 6fb092c4
......@@ -75,7 +75,8 @@ setup(name=name,
'cachecontrol',
'lockfile',
'uritemplate', # used by hateoas navigator
'subprocess32; python_version<"3"'
'subprocess32; python_version<"3"',
'ipaddress; python_version<"3"', # used by whitelistfirewall
] + additional_install_requires,
extras_require=extras_require,
tests_require=extras_require['test'],
......
......@@ -1247,8 +1247,8 @@ stderr_logfile_backups=1
finally:
self.logger.removeHandler(partition_file_handler)
partition_file_handler.close()
# Run manager tear down
# Run manager tear down, even if something happened, like promise error,
# as manager might be used for this
for manager in self._manager_list:
manager.instanceTearDown(local_partition)
......
# coding: utf-8
# Copyright (C) 2021 Nexedi SA and Contributors.
# Łukasz Nowak <luke@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
import hashlib
import ipaddress
import json
import logging
import os
import subprocess
from .interface import IManager
from zope.interface import implementer
logger = logging.getLogger(__name__)
# stolen from slapos/grid/slapgrid.py
class FPopen(subprocess.Popen):
def __init__(self, *args, **kwargs):
kwargs['stdin'] = subprocess.PIPE
kwargs['stderr'] = subprocess.STDOUT
kwargs.setdefault('stdout', subprocess.PIPE)
kwargs.setdefault('close_fds', True)
kwargs.setdefault('shell', False)
subprocess.Popen.__init__(self, *args, **kwargs)
self.stdin.flush()
self.stdin.close()
self.stdin = None
def fexecute(arg_list):
process = FPopen(arg_list, universal_newlines=True)
result, _ = process.communicate()
return process.returncode, result
@implementer(IManager)
class Manager(object):
whitelist_firewall_filename = '.slapos-whitelist-firewall'
whitelist_firewall_md5sum = '.slapos-whitelist-firewall.md5sum'
def __init__(self, config):
"""Manager needs to know config for its functioning.
"""
self.config = 'firewall' in config and config['firewall'] or None
def format(self, computer):
"""Method called at `slapos node format` phase.
:param computer: slapos.format.Computer, currently formatted computer
"""
def formatTearDown(self, computer):
"""Method called after `slapos node format` phase.
:param computer: slapos.format.Computer, formatted computer
"""
def software(self, software):
"""Method called at `slapos node software` phase.
:param software: slapos.grid.SlapObject.Software, currently processed
software
"""
def softwareTearDown(self, software):
"""Method called after `slapos node software` phase.
:param computer: slapos.grid.SlapObject.Software, processed software
"""
def instance(self, partition):
"""Method called at `slapos node instance` phase.
:param partition: slapos.grid.SlapObject.Partition, currently processed
partition
"""
def _fwCommunicate(self, arg_list):
return fexecute(
[self.config['firewall_cmd'], '--direct', '--permanent'] + arg_list
)[1]
def _reloadFirewalld(self):
return_code, output = fexecute([self.config['firewall_cmd'], '--reload'])
if return_code != 0:
raise ValueError('Problem while reloading firewalld: %s', output)
def _cleanUpPartitionFirewall(self, partition):
chain_name = '%s-whitelist' % (partition.partition_id,)
chain_cmd = ['ipv4', 'filter', chain_name]
user_id = partition.getUserGroupId()[0]
reload_firewall = False
if self._fwCommunicate(['--query-chain'] + chain_cmd).strip() == 'yes':
self._fwCommunicate(['--remove-rules', 'ipv4', 'filter', chain_name])
self._fwCommunicate(['--remove-chain'] + chain_cmd)
reload_firewall = True
rule_cmd = [
'ipv4', 'filter', 'OUTPUT', '0', '-m', 'owner', '--uid-owner',
str(user_id), '-j', chain_name]
if self._fwCommunicate(['--query-rule'] + rule_cmd).strip() == 'yes':
self._fwCommunicate(['--remove-rule'] + rule_cmd)
reload_firewall = True
if reload_firewall:
self._reloadFirewalld()
return reload_firewall
def instanceTearDown(self, partition):
"""Method called after `slapos node instance` phase.
:param partition: slapos.grid.SlapObject.Partition, processed partition
"""
if self.config is None:
logger.warning(
'[firewall] missing in the configuration, manager disabled.')
return
chain_name = '%s-whitelist' % (partition.partition_id,)
chain_cmd = ['ipv4', 'filter', chain_name]
user_id = partition.getUserGroupId()[0]
whitelist_firewall_md5sum_path = os.path.join(
partition.instance_path, self.whitelist_firewall_md5sum)
whitelist_firewall_path = os.path.join(
partition.instance_path, self.whitelist_firewall_filename)
if not os.path.exists(whitelist_firewall_path):
if self._cleanUpPartitionFirewall(partition):
logger.info(
'File %s does not exists, removed configuration for partition %s.',
whitelist_firewall_path, partition.partition_id)
if os.path.exists(whitelist_firewall_md5sum_path):
os.unlink(whitelist_firewall_md5sum_path)
return
with open(whitelist_firewall_path, 'rb') as fh:
whitelist_firewall_path_md5sum = hashlib.md5(fh.read()).hexdigest()
with open(whitelist_firewall_path) as f:
try:
json_list = json.load(f)
assert isinstance(json_list, list)
ip_list = []
for ip in json_list:
try:
ip_address = ipaddress.ip_address(ip)
if ip_address.version == 4:
ip_list.append(str(ip_address.exploded))
else:
logger.warning('Entry %r is not an IPv4', ip)
except Exception:
logger.warning('Entry %r is not a real IP', ip)
except Exception:
logger.warning(
'Bad whitelist firewall config %s', whitelist_firewall_path,
exc_info=True)
return
try:
with open(whitelist_firewall_md5sum_path, 'rb') as fh:
previous_md5sum = fh.read().strip()
except Exception:
# whatever happened, it means that md5sum became unreadable, so
# simply reset previous md5sum
previous_md5sum = b''
logger.info('Configuring partition %s.', partition.partition_id)
chain_added = False
if self._fwCommunicate(['--query-chain'] + chain_cmd).strip() != 'yes':
self._fwCommunicate(['--add-chain'] + chain_cmd)
chain_added = True
if chain_added or \
whitelist_firewall_path_md5sum != previous_md5sum.decode('utf-8'):
with open(whitelist_firewall_md5sum_path, 'wb') as fh:
# enforce re-add rules on next run, if any problem would be
# encountered
fh.write(b'')
self._fwCommunicate(['--remove-rules', 'ipv4', 'filter', chain_name])
for ip in ip_list:
# whitelist what is expected
self._fwCommunicate([
'--add-rule', 'ipv4', 'filter', chain_name, '0', '-d', ip, '-j',
'ACCEPT'])
# drop everything else
self._fwCommunicate([
'--add-rule', 'ipv4', 'filter', chain_name, '0', '-j', 'REJECT'])
# configure the rule for the user to whitelist the partition access
rule_cmd = [
'ipv4', 'filter', 'OUTPUT', '0', '-m', 'owner', '--uid-owner',
str(user_id), '-j', chain_name]
if self._fwCommunicate(['--query-rule'] + rule_cmd).strip() != 'yes':
self._fwCommunicate(['--add-rule'] + rule_cmd)
self._reloadFirewalld()
with open(whitelist_firewall_md5sum_path, 'wb') as fh:
# "commit" changes to the md5sum file
fh.write(whitelist_firewall_path_md5sum.encode())
logger.info('Updated rules for partition %s.', partition.partition_id)
else:
logger.debug(
'Skipped up-to-date rules for partition %s.', partition.partition_id)
def report(self, partition):
"""Method called at `slapos node report` phase.
:param partition: slapos.grid.SlapObject.Partition, currently processed
partition
"""
if self._cleanUpPartitionFirewall(partition):
logger.info(
'Cleaned up firewall for partition %s.', partition.partition_id)
whitelist_firewall_md5sum_path = os.path.join(
partition.instance_path, self.whitelist_firewall_md5sum)
if os.path.exists(whitelist_firewall_md5sum_path):
os.unlink(whitelist_firewall_md5sum_path)
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