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test_service_dns_forwarding.py
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test_service_dns_forwarding.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2022 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 re
import unittest
from base_vyostest_shim import VyOSUnitTestSHIM
from vyos.configsession import ConfigSessionError
from vyos.template import bracketize_ipv6
from vyos.util import read_file
from vyos.util import process_named_running
CONFIG_FILE = '/run/powerdns/recursor.conf'
FORWARD_FILE = '/run/powerdns/recursor.forward-zones.conf'
HOSTSD_FILE = '/run/powerdns/recursor.vyos-hostsd.conf.lua'
PROCESS_NAME= 'pdns_recursor'
base_path = ['service', 'dns', 'forwarding']
allow_from = ['192.0.2.0/24', '2001:db8::/32']
listen_adress = ['127.0.0.1', '::1']
def get_config_value(key, file=CONFIG_FILE):
tmp = read_file(file)
tmp = re.findall(r'\n{}=+(.*)'.format(key), tmp)
return tmp[0]
class TestServicePowerDNS(VyOSUnitTestSHIM.TestCase):
@classmethod
def setUpClass(cls):
super(TestServicePowerDNS, cls).setUpClass()
# ensure we can also run this test on a live system - so lets clean
# out the current configuration :)
cls.cli_delete(cls, base_path)
def tearDown(self):
# Check for running process
self.assertTrue(process_named_running(PROCESS_NAME))
# Delete DNS forwarding configuration
self.cli_delete(base_path)
self.cli_commit()
# Check for running process
self.assertFalse(process_named_running(PROCESS_NAME))
def test_basic_forwarding(self):
# Check basic DNS forwarding settings
cache_size = '20'
negative_ttl = '120'
self.cli_set(base_path + ['cache-size', cache_size])
self.cli_set(base_path + ['negative-ttl', negative_ttl])
# check validate() - allow from must be defined
with self.assertRaises(ConfigSessionError):
self.cli_commit()
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
# check validate() - listen-address must be defined
with self.assertRaises(ConfigSessionError):
self.cli_commit()
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
# configure DNSSEC
self.cli_set(base_path + ['dnssec', 'validate'])
# Do not use local /etc/hosts file in name resolution
self.cli_set(base_path + ['ignore-hosts-file'])
# commit changes
self.cli_commit()
# Check configured cache-size
tmp = get_config_value('max-cache-entries')
self.assertEqual(tmp, cache_size)
# Networks allowed to query this server
tmp = get_config_value('allow-from')
self.assertEqual(tmp, ','.join(allow_from))
# Addresses to listen for DNS queries
tmp = get_config_value('local-address')
self.assertEqual(tmp, ','.join(listen_adress))
# Maximum amount of time negative entries are cached
tmp = get_config_value('max-negative-ttl')
self.assertEqual(tmp, negative_ttl)
# Do not use local /etc/hosts file in name resolution
tmp = get_config_value('export-etc-hosts')
self.assertEqual(tmp, 'no')
# RFC1918 addresses are looked up by default
tmp = get_config_value('serve-rfc1918')
self.assertEqual(tmp, 'yes')
# verify default port configuration
tmp = get_config_value('local-port')
self.assertEqual(tmp, '53')
def test_dnssec(self):
# DNSSEC option testing
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
options = ['off', 'process-no-validate', 'process', 'log-fail', 'validate']
for option in options:
self.cli_set(base_path + ['dnssec', option])
# commit changes
self.cli_commit()
tmp = get_config_value('dnssec')
self.assertEqual(tmp, option)
def test_external_nameserver(self):
# Externe Domain Name Servers (DNS) addresses
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
nameservers = {'192.0.2.1': {}, '192.0.2.2': {'port': '53'}, '2001:db8::1': {'port': '853'}}
for h,p in nameservers.items():
if 'port' in p:
self.cli_set(base_path + ['name-server', h, 'port', p['port']])
else:
self.cli_set(base_path + ['name-server', h])
# commit changes
self.cli_commit()
tmp = get_config_value(r'\+.', file=FORWARD_FILE)
canonical_entries = [(lambda h, p: f"{bracketize_ipv6(h)}:{p['port'] if 'port' in p else 53}")(h, p)
for (h, p) in nameservers.items()]
self.assertEqual(tmp, ', '.join(canonical_entries))
# Do not use local /etc/hosts file in name resolution
# default: yes
tmp = get_config_value('export-etc-hosts')
self.assertEqual(tmp, 'yes')
def test_domain_forwarding(self):
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
domains = ['vyos.io', 'vyos.net', 'vyos.com']
nameservers = {'192.0.2.1': {}, '192.0.2.2': {'port': '53'}, '2001:db8::1': {'port': '853'}}
for domain in domains:
for h,p in nameservers.items():
if 'port' in p:
self.cli_set(base_path + ['domain', domain, 'name-server', h, 'port', p['port']])
else:
self.cli_set(base_path + ['domain', domain, 'name-server', h])
# Test 'recursion-desired' flag for only one domain
if domain == domains[0]:
self.cli_set(base_path + ['domain', domain, 'recursion-desired'])
# Test 'negative trust anchor' flag for the second domain only
if domain == domains[1]:
self.cli_set(base_path + ['domain', domain, 'addnta'])
# commit changes
self.cli_commit()
# Test configured name-servers
hosts_conf = read_file(HOSTSD_FILE)
for domain in domains:
# Test 'recursion-desired' flag for the first domain only
if domain == domains[0]: key =f'\+{domain}'
else: key =f'{domain}'
tmp = get_config_value(key, file=FORWARD_FILE)
canonical_entries = [(lambda h, p: f"{bracketize_ipv6(h)}:{p['port'] if 'port' in p else 53}")(h, p)
for (h, p) in nameservers.items()]
self.assertEqual(tmp, ', '.join(canonical_entries))
# Test 'negative trust anchor' flag for the second domain only
if domain == domains[1]:
self.assertIn(f'addNTA("{domain}", "static")', hosts_conf)
def test_no_rfc1918_forwarding(self):
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
self.cli_set(base_path + ['no-serve-rfc1918'])
# commit changes
self.cli_commit()
# verify configuration
tmp = get_config_value('serve-rfc1918')
self.assertEqual(tmp, 'no')
def test_dns64(self):
dns_prefix = '64:ff9b::/96'
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
# Check dns64-prefix - must be prefix /96
self.cli_set(base_path + ['dns64-prefix', '2001:db8:aabb::/64'])
with self.assertRaises(ConfigSessionError):
self.cli_commit()
self.cli_set(base_path + ['dns64-prefix', dns_prefix])
# commit changes
self.cli_commit()
# verify dns64-prefix configuration
tmp = get_config_value('dns64-prefix')
self.assertEqual(tmp, dns_prefix)
def test_listening_port(self):
# We can listen on a different port compared to '53' but only one at a time
for port in ['1053', '5353']:
self.cli_set(base_path + ['port', port])
for network in allow_from:
self.cli_set(base_path + ['allow-from', network])
for address in listen_adress:
self.cli_set(base_path + ['listen-address', address])
# commit changes
self.cli_commit()
# verify local-port configuration
tmp = get_config_value('local-port')
self.assertEqual(tmp, port)
if __name__ == '__main__':
unittest.main(verbosity=2, failfast=True)

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