#!/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 . 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'], 'nftables': ['ct helper set "ftp_tcp"'] }, 'h323': { 'driver': ['nf_nat_h323', 'nf_conntrack_h323'], 'nftables': ['ct helper set "ras_udp"', 'ct helper set "q931_tcp"'] }, 'nfs': { 'nftables': ['ct helper set "rpc_tcp"', 'ct helper set "rpc_udp"'] }, 'pptp': { 'driver': ['nf_nat_pptp', 'nf_conntrack_pptp'], 'nftables': ['ct helper set "pptp_tcp"'] }, 'sip': { 'driver': ['nf_nat_sip', 'nf_conntrack_sip'], 'nftables': ['ct helper set "sip_tcp"', 'ct helper set "sip_udp"'] }, 'sqlnet': { 'nftables': ['ct helper set "tns_tcp"'] }, 'tftp': { 'driver': ['nf_nat_tftp', 'nf_conntrack_tftp'], 'nftables': ['ct helper set "tftp_udp"'] }, } # 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)