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#!/usr/bin/env python3
#
# Copyright (C) 2021-2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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, see <http://www.gnu.org/licenses/>.
import os
import re
import unittest
from base_vyostest_shim import VyOSUnitTestSHIM
from vyos.firewall import find_nftables_rule
from vyos.utils.process import cmd
from vyos.utils.file import read_file
base_path = ['system', 'conntrack']
def get_sysctl(parameter):
tmp = parameter.replace(r'.', r'/')
return read_file(f'/proc/sys/{tmp}')
class TestSystemConntrack(VyOSUnitTestSHIM.TestCase):
def tearDown(self):
self.cli_delete(base_path)
self.cli_commit()
def verify_nftables(self, nftables_search, table, inverse=False, args=''):
nftables_output = cmd(f'sudo nft {args} list table {table}')
for search in nftables_search:
matched = False
for line in nftables_output.split("\n"):
if all(item in line for item in search):
matched = True
break
self.assertTrue(not matched if inverse else matched, msg=search)
def test_conntrack_options(self):
conntrack_config = {
'net.netfilter.nf_conntrack_expect_max' : {
'cli' : ['expect-table-size'],
'test_value' : '8192',
'default_value' : '2048',
},
'net.nf_conntrack_max' :{
'cli' : ['table-size'],
'test_value' : '500000',
'default_value' : '262144',
},
'net.ipv4.tcp_max_syn_backlog' :{
'cli' : ['tcp', 'half-open-connections'],
'test_value' : '2048',
'default_value' : '512',
},
'net.netfilter.nf_conntrack_tcp_loose' :{
'cli' : ['tcp', 'loose'],
'test_value' : 'disable',
'default_value' : '1',
},
'net.netfilter.nf_conntrack_tcp_max_retrans' :{
'cli' : ['tcp', 'max-retrans'],
'test_value' : '128',
'default_value' : '3',
},
'net.netfilter.nf_conntrack_icmp_timeout' :{
'cli' : ['timeout', 'icmp'],
'test_value' : '180',
'default_value' : '30',
},
'net.netfilter.nf_conntrack_generic_timeout' :{
'cli' : ['timeout', 'other'],
'test_value' : '1200',
'default_value' : '600',
},
'net.netfilter.nf_conntrack_tcp_timeout_close_wait' :{
'cli' : ['timeout', 'tcp', 'close-wait'],
'test_value' : '30',
'default_value' : '60',
},
'net.netfilter.nf_conntrack_tcp_timeout_close' :{
'cli' : ['timeout', 'tcp', 'close'],
'test_value' : '20',
'default_value' : '10',
},
'net.netfilter.nf_conntrack_tcp_timeout_established' :{
'cli' : ['timeout', 'tcp', 'established'],
'test_value' : '1000',
'default_value' : '432000',
},
'net.netfilter.nf_conntrack_tcp_timeout_fin_wait' :{
'cli' : ['timeout', 'tcp', 'fin-wait'],
'test_value' : '240',
'default_value' : '120',
},
'net.netfilter.nf_conntrack_tcp_timeout_last_ack' :{
'cli' : ['timeout', 'tcp', 'last-ack'],
'test_value' : '300',
'default_value' : '30',
},
'net.netfilter.nf_conntrack_tcp_timeout_syn_recv' :{
'cli' : ['timeout', 'tcp', 'syn-recv'],
'test_value' : '100',
'default_value' : '60',
},
'net.netfilter.nf_conntrack_tcp_timeout_syn_sent' :{
'cli' : ['timeout', 'tcp', 'syn-sent'],
'test_value' : '300',
'default_value' : '120',
},
'net.netfilter.nf_conntrack_tcp_timeout_time_wait' :{
'cli' : ['timeout', 'tcp', 'time-wait'],
'test_value' : '303',
'default_value' : '120',
},
'net.netfilter.nf_conntrack_udp_timeout' :{
'cli' : ['timeout', 'udp', 'other'],
'test_value' : '90',
'default_value' : '30',
},
'net.netfilter.nf_conntrack_udp_timeout_stream' :{
'cli' : ['timeout', 'udp', 'stream'],
'test_value' : '200',
'default_value' : '180',
},
}
for parameter, parameter_config in conntrack_config.items():
self.cli_set(base_path + parameter_config['cli'] + [parameter_config['test_value']])
# commit changes
self.cli_commit()
# validate configuration
for parameter, parameter_config in conntrack_config.items():
tmp = parameter_config['test_value']
# net.netfilter.nf_conntrack_tcp_loose has a fancy "disable" value,
# make this work
if tmp == 'disable':
tmp = '0'
self.assertEqual(get_sysctl(f'{parameter}'), tmp)
# delete all configuration options and revert back to defaults
self.cli_delete(base_path)
self.cli_commit()
# validate configuration
for parameter, parameter_config in conntrack_config.items():
self.assertEqual(get_sysctl(f'{parameter}'), parameter_config['default_value'])
def test_conntrack_module_enable(self):
# conntrack helper modules are disabled by default
modules = {
'ftp' : {
'driver' : ['nf_nat_ftp', 'nf_conntrack_ftp'],
},
'h323' : {
'driver' : ['nf_nat_h323', 'nf_conntrack_h323'],
},
'nfs' : {
'nftables' : ['ct helper set "rpc_tcp"',
'ct helper set "rpc_udp"']
},
'pptp' : {
'driver' : ['nf_nat_pptp', 'nf_conntrack_pptp'],
},
'sip' : {
'driver' : ['nf_nat_sip', 'nf_conntrack_sip'],
},
'sqlnet' : {
'nftables' : ['ct helper set "tns_tcp"']
},
'tftp' : {
'driver' : ['nf_nat_tftp', 'nf_conntrack_tftp'],
},
}
# load modules
for module in modules:
self.cli_set(base_path + ['modules', module])
# commit changes
self.cli_commit()
# verify modules are loaded on the system
for module, module_options in modules.items():
if 'driver' in module_options:
for driver in module_options['driver']:
self.assertTrue(os.path.isdir(f'/sys/module/{driver}'))
if 'nftables' in module_options:
for rule in module_options['nftables']:
self.assertTrue(find_nftables_rule('ip vyos_conntrack', 'VYOS_CT_HELPER', [rule]) != None)
# unload modules
for module in modules:
self.cli_delete(base_path + ['modules', module])
# commit changes
self.cli_commit()
# verify modules are not loaded on the system
for module, module_options in modules.items():
if 'driver' in module_options:
for driver in module_options['driver']:
self.assertFalse(os.path.isdir(f'/sys/module/{driver}'))
if 'nftables' in module_options:
for rule in module_options['nftables']:
self.assertTrue(find_nftables_rule('ip vyos_conntrack', 'VYOS_CT_HELPER', [rule]) == None)
def test_conntrack_hash_size(self):
hash_size = '65536'
hash_size_default = '32768'
self.cli_set(base_path + ['hash-size', hash_size])
# commit changes
self.cli_commit()
# verify new configuration - only effective after reboot, but
# a valid config file is sufficient
tmp = read_file('/etc/modprobe.d/vyatta_nf_conntrack.conf')
self.assertIn(hash_size, tmp)
# Test default value by deleting the configuration
self.cli_delete(base_path + ['hash-size'])
# commit changes
self.cli_commit()
# verify new configuration - only effective after reboot, but
# a valid config file is sufficient
tmp = read_file('/etc/modprobe.d/vyatta_nf_conntrack.conf')
self.assertIn(hash_size_default, tmp)
def test_conntrack_ignore(self):
address_group = 'conntracktest'
address_group_member = '192.168.0.1'
ipv6_address_group = 'conntracktest6'
ipv6_address_group_member = 'dead:beef::1'
self.cli_set(['firewall', 'group', 'address-group', address_group, 'address', address_group_member])
self.cli_set(['firewall', 'group', 'ipv6-address-group', ipv6_address_group, 'address', ipv6_address_group_member])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '1', 'source', 'address', '192.0.2.1'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '1', 'destination', 'address', '192.0.2.2'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '1', 'destination', 'port', '22'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '1', 'protocol', 'tcp'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '1', 'tcp', 'flags', 'syn'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '2', 'source', 'address', '192.0.2.1'])
self.cli_set(base_path + ['ignore', 'ipv4', 'rule', '2', 'destination', 'group', 'address-group', address_group])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '11', 'source', 'address', 'fe80::1'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '11', 'destination', 'address', 'fe80::2'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '11', 'destination', 'port', '22'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '11', 'protocol', 'tcp'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '12', 'source', 'address', 'fe80::1'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '12', 'destination', 'group', 'address-group', ipv6_address_group])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '13', 'source', 'address', 'fe80::1'])
self.cli_set(base_path + ['ignore', 'ipv6', 'rule', '13', 'destination', 'address', '!fe80::3'])
self.cli_commit()
nftables_search = [
['ip saddr 192.0.2.1', 'ip daddr 192.0.2.2', 'tcp dport 22', 'tcp flags & syn == syn', 'notrack'],
['ip saddr 192.0.2.1', 'ip daddr @A_conntracktest', 'notrack']
]
nftables6_search = [
['ip6 saddr fe80::1', 'ip6 daddr fe80::2', 'tcp dport 22', 'notrack'],
['ip6 saddr fe80::1', 'ip6 daddr @A6_conntracktest6', 'notrack'],
['ip6 saddr fe80::1', 'ip6 daddr != fe80::3', 'notrack']
]
self.verify_nftables(nftables_search, 'ip vyos_conntrack')
self.verify_nftables(nftables6_search, 'ip6 vyos_conntrack')
self.cli_delete(['firewall'])
if __name__ == '__main__':
unittest.main(verbosity=2)
|
