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systemd/test/networkd-test.py
Martin Pitt b9fe94cad9 resolved: don't query domain-limited DNS servers for other domains (#3621) 
DNS servers which have route-only domains should only be used for
the specified domains. Routing queries about other domains there is a privacy
violation, prone to fail (as that DNS server was not meant to be used for other
domains), and puts unnecessary load onto that server.

Introduce a new helper function dns_server_limited_domains() that checks if the
DNS server should only be used for some selected domains, i. e. has some
route-only domains without "~.". Use that when determining whether to query it
in the scope, and when writing resolv.conf.

Extend the test_route_only_dns() case to ensure that the DNS server limited to
~company does not appear in resolv.conf. Add test_route_only_dns_all_domains()
to ensure that a server that also has ~. does appear in resolv.conf as global
name server. These reproduce #3420.

Add a new test_resolved_domain_restricted_dns() test case that verifies that
domain-limited DNS servers are only being used for those domains. This
reproduces #3421.

Clarify what a "routing domain" is in the manpage.

Fixes #3420
Fixes #3421
2016-09-30 09:30:08 +02:00

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#!/usr/bin/env python3
#
# networkd integration test
# This uses temporary configuration in /run and temporary veth devices, and
# does not write anything on disk or change any system configuration;
# but it assumes (and checks at the beginning) that networkd is not currently
# running.
#
# This can be run on a normal installation, in QEMU, nspawn (with
# --private-network), LXD (with "--config raw.lxc=lxc.aa_profile=unconfined"),
# or LXC system containers. You need at least the "ip" tool from the iproute
# package; it is recommended to install dnsmasq too to get full test coverage.
#
# ATTENTION: This uses the *installed* networkd, not the one from the built
# source tree.
#
# (C) 2015 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# systemd 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with systemd; If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import time
import unittest
import tempfile
import subprocess
import shutil
networkd_active = subprocess.call(['systemctl', 'is-active', '--quiet',
'systemd-networkd']) == 0
have_dnsmasq = shutil.which('dnsmasq')
RESOLV_CONF = '/run/systemd/resolve/resolv.conf'
@unittest.skipIf(networkd_active,
'networkd is already active')
class ClientTestBase:
def setUp(self):
self.iface = 'test_eth42'
self.if_router = 'router_eth42'
self.workdir_obj = tempfile.TemporaryDirectory()
self.workdir = self.workdir_obj.name
self.config = '/run/systemd/network/test_eth42.network'
# avoid "Failed to open /dev/tty" errors in containers
os.environ['SYSTEMD_LOG_TARGET'] = 'journal'
# determine path to systemd-networkd-wait-online
for p in ['/usr/lib/systemd/systemd-networkd-wait-online',
'/lib/systemd/systemd-networkd-wait-online']:
if os.path.exists(p):
self.networkd_wait_online = p
break
else:
self.fail('systemd-networkd-wait-online not found')
# get current journal cursor
out = subprocess.check_output(['journalctl', '-b', '--quiet',
'--no-pager', '-n0', '--show-cursor'],
universal_newlines=True)
self.assertTrue(out.startswith('-- cursor:'))
self.journal_cursor = out.split()[-1]
def tearDown(self):
self.shutdown_iface()
subprocess.call(['systemctl', 'stop', 'systemd-networkd'])
def writeConfig(self, fname, contents):
os.makedirs(os.path.dirname(fname), exist_ok=True)
with open(fname, 'w') as f:
f.write(contents)
self.addCleanup(os.remove, fname)
def show_journal(self, unit):
'''Show journal of given unit since start of the test'''
print('---- %s ----' % unit)
sys.stdout.flush()
subprocess.call(['journalctl', '-b', '--no-pager', '--quiet',
'--cursor', self.journal_cursor, '-u', unit])
def create_iface(self, ipv6=False):
'''Create test interface with DHCP server behind it'''
raise NotImplementedError('must be implemented by a subclass')
def shutdown_iface(self):
'''Remove test interface and stop DHCP server'''
raise NotImplementedError('must be implemented by a subclass')
def print_server_log(self):
'''Print DHCP server log for debugging failures'''
raise NotImplementedError('must be implemented by a subclass')
def do_test(self, coldplug=True, ipv6=False, extra_opts='',
online_timeout=10, dhcp_mode='yes'):
subprocess.check_call(['systemctl', 'start', 'systemd-resolved'])
self.writeConfig(self.config, '''\
[Match]
Name=%s
[Network]
DHCP=%s
%s''' % (self.iface, dhcp_mode, extra_opts))
if coldplug:
# create interface first, then start networkd
self.create_iface(ipv6=ipv6)
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
else:
# start networkd first, then create interface
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
self.create_iface(ipv6=ipv6)
try:
subprocess.check_call([self.networkd_wait_online, '--interface',
self.iface, '--timeout=%i' % online_timeout])
if ipv6:
# check iface state and IP 6 address; FIXME: we need to wait a bit
# longer, as the iface is "configured" already with IPv4 *or*
# IPv6, but we want to wait for both
for timeout in range(10):
out = subprocess.check_output(['ip', 'a', 'show', 'dev', self.iface])
if b'state UP' in out and b'inet6 2600' in out and b'inet 192.168' in out:
break
time.sleep(1)
else:
self.fail('timed out waiting for IPv6 configuration')
self.assertRegex(out, b'inet6 2600::.* scope global .*dynamic')
self.assertRegex(out, b'inet6 fe80::.* scope link')
else:
# should have link-local address on IPv6 only
out = subprocess.check_output(['ip', '-6', 'a', 'show', 'dev', self.iface])
self.assertRegex(out, b'inet6 fe80::.* scope link')
self.assertNotIn(b'scope global', out)
# should have IPv4 address
out = subprocess.check_output(['ip', '-4', 'a', 'show', 'dev', self.iface])
self.assertIn(b'state UP', out)
self.assertRegex(out, b'inet 192.168.5.\d+/.* scope global dynamic')
# check networkctl state
out = subprocess.check_output(['networkctl'])
self.assertRegex(out, ('%s\s+ether\s+routable\s+unmanaged' % self.if_router).encode())
self.assertRegex(out, ('%s\s+ether\s+routable\s+configured' % self.iface).encode())
out = subprocess.check_output(['networkctl', 'status', self.iface])
self.assertRegex(out, b'Type:\s+ether')
self.assertRegex(out, b'State:\s+routable.*configured')
self.assertRegex(out, b'Address:\s+192.168.5.\d+')
if ipv6:
self.assertRegex(out, b'2600::')
else:
self.assertNotIn(b'2600::', out)
self.assertRegex(out, b'fe80::')
self.assertRegex(out, b'Gateway:\s+192.168.5.1')
self.assertRegex(out, b'DNS:\s+192.168.5.1')
except (AssertionError, subprocess.CalledProcessError):
# show networkd status, journal, and DHCP server log on failure
with open(self.config) as f:
print('\n---- %s ----\n%s' % (self.config, f.read()))
print('---- interface status ----')
sys.stdout.flush()
subprocess.call(['ip', 'a', 'show', 'dev', self.iface])
print('---- networkctl status %s ----' % self.iface)
sys.stdout.flush()
subprocess.call(['networkctl', 'status', self.iface])
self.show_journal('systemd-networkd.service')
self.print_server_log()
raise
for timeout in range(50):
with open(RESOLV_CONF) as f:
contents = f.read()
if 'nameserver 192.168.5.1\n' in contents:
break
time.sleep(0.1)
else:
self.fail('nameserver 192.168.5.1 not found in ' + RESOLV_CONF)
if not coldplug:
# check post-down.d hook
self.shutdown_iface()
def test_coldplug_dhcp_yes_ip4(self):
# we have a 12s timeout on RA, so we need to wait longer
self.do_test(coldplug=True, ipv6=False, online_timeout=15)
def test_coldplug_dhcp_yes_ip4_no_ra(self):
# with disabling RA explicitly things should be fast
self.do_test(coldplug=True, ipv6=False,
extra_opts='IPv6AcceptRA=False')
def test_coldplug_dhcp_ip4_only(self):
# we have a 12s timeout on RA, so we need to wait longer
self.do_test(coldplug=True, ipv6=False, dhcp_mode='ipv4',
online_timeout=15)
def test_coldplug_dhcp_ip4_only_no_ra(self):
# with disabling RA explicitly things should be fast
self.do_test(coldplug=True, ipv6=False, dhcp_mode='ipv4',
extra_opts='IPv6AcceptRA=False')
def test_coldplug_dhcp_ip6(self):
self.do_test(coldplug=True, ipv6=True)
def test_hotplug_dhcp_ip4(self):
# With IPv4 only we have a 12s timeout on RA, so we need to wait longer
self.do_test(coldplug=False, ipv6=False, online_timeout=15)
def test_hotplug_dhcp_ip6(self):
self.do_test(coldplug=False, ipv6=True)
def test_route_only_dns(self):
self.writeConfig('/run/systemd/network/myvpn.netdev', '''\
[NetDev]
Name=dummy0
Kind=dummy
MACAddress=12:34:56:78:9a:bc''')
self.writeConfig('/run/systemd/network/myvpn.network', '''\
[Match]
Name=dummy0
[Network]
Address=192.168.42.100
DNS=192.168.42.1
Domains= ~company''')
self.do_test(coldplug=True, ipv6=False,
extra_opts='IPv6AcceptRouterAdvertisements=False')
with open(RESOLV_CONF) as f:
contents = f.read()
# ~company is not a search domain, only a routing domain
self.assertNotRegex(contents, 'search.*company')
# our global server should appear
self.assertIn('nameserver 192.168.5.1\n', contents)
# should not have domain-restricted server as global server
self.assertNotIn('nameserver 192.168.42.1\n', contents)
def test_route_only_dns_all_domains(self):
with open('/run/systemd/network/myvpn.netdev', 'w') as f:
f.write('''[NetDev]
Name=dummy0
Kind=dummy
MACAddress=12:34:56:78:9a:bc''')
with open('/run/systemd/network/myvpn.network', 'w') as f:
f.write('''[Match]
Name=dummy0
[Network]
Address=192.168.42.100
DNS=192.168.42.1
Domains= ~company ~.''')
self.addCleanup(os.remove, '/run/systemd/network/myvpn.netdev')
self.addCleanup(os.remove, '/run/systemd/network/myvpn.network')
self.do_test(coldplug=True, ipv6=False,
extra_opts='IPv6AcceptRouterAdvertisements=False')
with open(RESOLV_CONF) as f:
contents = f.read()
# ~company is not a search domain, only a routing domain
self.assertNotRegex(contents, 'search.*company')
# our global server should appear
self.assertIn('nameserver 192.168.5.1\n', contents)
# should have company server as global server due to ~.
self.assertIn('nameserver 192.168.42.1\n', contents)
@unittest.skipUnless(have_dnsmasq, 'dnsmasq not installed')
class DnsmasqClientTest(ClientTestBase, unittest.TestCase):
'''Test networkd client against dnsmasq'''
def setUp(self):
super().setUp()
self.dnsmasq = None
def create_iface(self, ipv6=False, dnsmasq_opts=None):
'''Create test interface with DHCP server behind it'''
# add veth pair
subprocess.check_call(['ip', 'link', 'add', 'name', self.iface, 'type',
'veth', 'peer', 'name', self.if_router])
# give our router an IP
subprocess.check_call(['ip', 'a', 'flush', 'dev', self.if_router])
subprocess.check_call(['ip', 'a', 'add', '192.168.5.1/24', 'dev', self.if_router])
if ipv6:
subprocess.check_call(['ip', 'a', 'add', '2600::1/64', 'dev', self.if_router])
subprocess.check_call(['ip', 'link', 'set', self.if_router, 'up'])
# add DHCP server
self.dnsmasq_log = os.path.join(self.workdir, 'dnsmasq.log')
lease_file = os.path.join(self.workdir, 'dnsmasq.leases')
if ipv6:
extra_opts = ['--enable-ra', '--dhcp-range=2600::10,2600::20']
else:
extra_opts = []
if dnsmasq_opts:
extra_opts += dnsmasq_opts
self.dnsmasq = subprocess.Popen(
['dnsmasq', '--keep-in-foreground', '--log-queries',
'--log-facility=' + self.dnsmasq_log, '--conf-file=/dev/null',
'--dhcp-leasefile=' + lease_file, '--bind-interfaces',
'--interface=' + self.if_router, '--except-interface=lo',
'--dhcp-range=192.168.5.10,192.168.5.200'] + extra_opts)
def shutdown_iface(self):
'''Remove test interface and stop DHCP server'''
if self.if_router:
subprocess.check_call(['ip', 'link', 'del', 'dev', self.if_router])
self.if_router = None
if self.dnsmasq:
self.dnsmasq.kill()
self.dnsmasq.wait()
self.dnsmasq = None
def print_server_log(self):
'''Print DHCP server log for debugging failures'''
with open(self.dnsmasq_log) as f:
sys.stdout.write('\n\n---- dnsmasq log ----\n%s\n------\n\n' % f.read())
def test_resolved_domain_restricted_dns(self):
'''resolved: domain-restricted DNS servers'''
# create interface for generic connections; this will map all DNS names
# to 192.168.42.1
self.create_iface(dnsmasq_opts=['--address=/#/192.168.42.1'])
self.writeConfig('/run/systemd/network/general.network', '''\
[Match]
Name=%s
[Network]
DHCP=ipv4
IPv6AcceptRA=False''' % self.iface)
# create second device/dnsmasq for a .company/.lab VPN interface
# static IPs for simplicity
subprocess.check_call(['ip', 'link', 'add', 'name', 'testvpnclient', 'type',
'veth', 'peer', 'name', 'testvpnrouter'])
self.addCleanup(subprocess.call, ['ip', 'link', 'del', 'dev', 'testvpnrouter'])
subprocess.check_call(['ip', 'a', 'flush', 'dev', 'testvpnrouter'])
subprocess.check_call(['ip', 'a', 'add', '10.241.3.1/24', 'dev', 'testvpnrouter'])
subprocess.check_call(['ip', 'link', 'set', 'testvpnrouter', 'up'])
vpn_dnsmasq_log = os.path.join(self.workdir, 'dnsmasq-vpn.log')
vpn_dnsmasq = subprocess.Popen(
['dnsmasq', '--keep-in-foreground', '--log-queries',
'--log-facility=' + vpn_dnsmasq_log, '--conf-file=/dev/null',
'--dhcp-leasefile=/dev/null', '--bind-interfaces',
'--interface=testvpnrouter', '--except-interface=lo',
'--address=/math.lab/10.241.3.3', '--address=/cantina.company/10.241.4.4'])
self.addCleanup(vpn_dnsmasq.wait)
self.addCleanup(vpn_dnsmasq.kill)
self.writeConfig('/run/systemd/network/vpn.network', '''\
[Match]
Name=testvpnclient
[Network]
IPv6AcceptRA=False
Address=10.241.3.2/24
DNS=10.241.3.1
Domains= ~company ~lab''')
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
subprocess.check_call([self.networkd_wait_online, '--interface', self.iface,
'--interface=testvpnclient', '--timeout=20'])
# ensure we start fresh with every test
subprocess.check_call(['systemctl', 'restart', 'systemd-resolved'])
# test vpnclient specific domains; these should *not* be answered by
# the general DNS
out = subprocess.check_output(['systemd-resolve', 'math.lab'])
self.assertIn(b'math.lab: 10.241.3.3', out)
out = subprocess.check_output(['systemd-resolve', 'kettle.cantina.company'])
self.assertIn(b'kettle.cantina.company: 10.241.4.4', out)
# test general domains
out = subprocess.check_output(['systemd-resolve', 'megasearch.net'])
self.assertIn(b'megasearch.net: 192.168.42.1', out)
with open(self.dnsmasq_log) as f:
general_log = f.read()
with open(vpn_dnsmasq_log) as f:
vpn_log = f.read()
# VPN domains should only be sent to VPN DNS
self.assertRegex(vpn_log, 'query.*math.lab')
self.assertRegex(vpn_log, 'query.*cantina.company')
self.assertNotIn('lab', general_log)
self.assertNotIn('company', general_log)
# general domains should not be sent to the VPN DNS
self.assertRegex(general_log, 'query.*megasearch.net')
self.assertNotIn('megasearch.net', vpn_log)
class NetworkdClientTest(ClientTestBase, unittest.TestCase):
'''Test networkd client against networkd server'''
def setUp(self):
super().setUp()
self.dnsmasq = None
def create_iface(self, ipv6=False):
'''Create test interface with DHCP server behind it'''
# run "router-side" networkd in own mount namespace to shield it from
# "client-side" configuration and networkd
(fd, script) = tempfile.mkstemp(prefix='networkd-router.sh')
self.addCleanup(os.remove, script)
with os.fdopen(fd, 'w+') as f:
f.write('''\
#!/bin/sh -eu
mkdir -p /run/systemd/network
mkdir -p /run/systemd/netif
mount -t tmpfs none /run/systemd/network
mount -t tmpfs none /run/systemd/netif
[ ! -e /run/dbus ] || mount -t tmpfs none /run/dbus
# create router/client veth pair
cat << EOF > /run/systemd/network/test.netdev
[NetDev]
Name=%(ifr)s
Kind=veth
[Peer]
Name=%(ifc)s
EOF
cat << EOF > /run/systemd/network/test.network
[Match]
Name=%(ifr)s
[Network]
Address=192.168.5.1/24
%(addr6)s
DHCPServer=yes
[DHCPServer]
PoolOffset=10
PoolSize=50
DNS=192.168.5.1
EOF
# run networkd as in systemd-networkd.service
exec $(systemctl cat systemd-networkd.service | sed -n '/^ExecStart=/ { s/^.*=//; p}')
''' % {'ifr': self.if_router, 'ifc': self.iface, 'addr6': ipv6 and 'Address=2600::1/64' or ''})
os.fchmod(fd, 0o755)
subprocess.check_call(['systemd-run', '--unit=networkd-test-router.service',
'-p', 'InaccessibleDirectories=-/etc/systemd/network',
'-p', 'InaccessibleDirectories=-/run/systemd/network',
'-p', 'InaccessibleDirectories=-/run/systemd/netif',
'--service-type=notify', script])
# wait until devices got created
for timeout in range(50):
out = subprocess.check_output(['ip', 'a', 'show', 'dev', self.if_router])
if b'state UP' in out and b'scope global' in out:
break
time.sleep(0.1)
def shutdown_iface(self):
'''Remove test interface and stop DHCP server'''
if self.if_router:
subprocess.check_call(['systemctl', 'stop', 'networkd-test-router.service'])
# ensure failed transient unit does not stay around
subprocess.call(['systemctl', 'reset-failed', 'networkd-test-router.service'])
subprocess.call(['ip', 'link', 'del', 'dev', self.if_router])
self.if_router = None
def print_server_log(self):
'''Print DHCP server log for debugging failures'''
self.show_journal('networkd-test-router.service')
@unittest.skip('networkd does not have DHCPv6 server support')
def test_hotplug_dhcp_ip6(self):
pass
@unittest.skip('networkd does not have DHCPv6 server support')
def test_coldplug_dhcp_ip6(self):
pass
def test_search_domains(self):
# we don't use this interface for this test
self.if_router = None
self.writeConfig('/run/systemd/network/test.netdev', '''\
[NetDev]
Name=dummy0
Kind=dummy
MACAddress=12:34:56:78:9a:bc''')
self.writeConfig('/run/systemd/network/test.network', '''\
[Match]
Name=dummy0
[Network]
Address=192.168.42.100
DNS=192.168.42.1
Domains= one two three four five six seven eight nine ten''')
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
for timeout in range(50):
with open(RESOLV_CONF) as f:
contents = f.read()
if ' one' in contents:
break
time.sleep(0.1)
self.assertRegex(contents, 'search .*one two three four')
self.assertNotIn('seven\n', contents)
self.assertIn('# Too many search domains configured, remaining ones ignored.\n', contents)
def test_search_domains_too_long(self):
# we don't use this interface for this test
self.if_router = None
name_prefix = 'a' * 60
self.writeConfig('/run/systemd/network/test.netdev', '''\
[NetDev]
Name=dummy0
Kind=dummy
MACAddress=12:34:56:78:9a:bc''')
self.writeConfig('/run/systemd/network/test.network', '''\
[Match]
Name=dummy0
[Network]
Address=192.168.42.100
DNS=192.168.42.1
Domains={p}0 {p}1 {p}2 {p}3 {p}4'''.format(p=name_prefix))
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
for timeout in range(50):
with open(RESOLV_CONF) as f:
contents = f.read()
if ' one' in contents:
break
time.sleep(0.1)
self.assertRegex(contents, 'search .*{p}0 {p}1 {p}2'.format(p=name_prefix))
self.assertIn('# Total length of all search domains is too long, remaining ones ignored.', contents)
def test_dropin(self):
# we don't use this interface for this test
self.if_router = None
self.writeConfig('/run/systemd/network/test.netdev', '''\
[NetDev]
Name=dummy0
Kind=dummy
MACAddress=12:34:56:78:9a:bc''')
self.writeConfig('/run/systemd/network/test.network', '''\
[Match]
Name=dummy0
[Network]
Address=192.168.42.100
DNS=192.168.42.1''')
self.writeConfig('/run/systemd/network/test.network.d/dns.conf', '''\
[Network]
DNS=127.0.0.1''')
subprocess.check_call(['systemctl', 'start', 'systemd-networkd'])
for timeout in range(50):
with open(RESOLV_CONF) as f:
contents = f.read()
if ' 127.0.0.1' in contents:
break
time.sleep(0.1)
self.assertIn('nameserver 192.168.42.1\n', contents)
self.assertIn('nameserver 127.0.0.1\n', contents)
if __name__ == '__main__':
unittest.main(testRunner=unittest.TextTestRunner(stream=sys.stdout,
verbosity=2))
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