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test_interfaces_openvpn.py
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test_interfaces_openvpn.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020 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 unittest
from ipaddress import IPv4Network
from netifaces import interfaces
from vyos.configsession import ConfigSession
from vyos.configsession import ConfigSessionError
from vyos.util import cmd
from vyos.util import process_named_running
from vyos.util import read_file
PROCESS_NAME = 'openvpn'
base_path = ['interfaces', 'openvpn']
ca_cert = '/config/auth/ovpn_test_ca.pem'
ssl_cert = '/config/auth/ovpn_test_server.pem'
ssl_key = '/config/auth/ovpn_test_server.key'
dh_pem = '/config/auth/ovpn_test_dh.pem'
s2s_key = '/config/auth/ovpn_test_site2site.key'
remote_port = '1194'
protocol = 'udp'
path = []
interface = ''
remote_host = ''
class TestInterfacesOpenVPN(unittest.TestCase):
def setUp(self):
self.session = ConfigSession(os.getpid())
self.session.set(['interfaces', 'dummy', 'dum1328', 'address', '192.0.2.1/24'])
def tearDown(self):
self.session.delete(base_path)
self.session.delete(['interfaces', 'dummy', 'dum1328'])
self.session.commit()
del self.session
def test_client_interfaces(self):
""" Create OpenVPN client interfaces connecting to different
server IP addresses. Validate configuration afterwards. """
num_range = range(10, 15)
for ii in num_range:
interface = f'vtun{ii}'
remote_host = f'192.0.2.{ii}'
path = base_path + [interface]
auth_hash = 'sha1'
self.session.set(path + ['device-type', 'tun'])
self.session.set(path + ['encryption', 'cipher', 'aes256'])
self.session.set(path + ['hash', auth_hash])
self.session.set(path + ['mode', 'client'])
self.session.set(path + ['persistent-tunnel'])
self.session.set(path + ['protocol', protocol])
self.session.set(path + ['remote-host', remote_host])
self.session.set(path + ['remote-port', remote_port])
self.session.set(path + ['tls', 'ca-cert-file', ca_cert])
self.session.set(path + ['tls', 'cert-file', ssl_cert])
self.session.set(path + ['tls', 'key-file', ssl_key])
self.session.set(path + ['vrf', vrf_name])
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
remote_host = f'192.0.2.{ii}'
config_file = f'/run/openvpn/{interface}.conf'
config = read_file(config_file)
self.assertIn(f'dev {interface}', config)
self.assertIn(f'dev-type tun', config)
self.assertIn(f'persist-key', config)
self.assertIn(f'proto {protocol}', config)
self.assertIn(f'rport {remote_port}', config)
self.assertIn(f'remote {remote_host}', config)
self.assertIn(f'persist-tun', config)
self.assertIn(f'auth {auth_hash}', config)
self.assertIn(f'cipher aes-256-cbc', config)
# TLS options
self.assertIn(f'ca {ca_cert}', config)
self.assertIn(f'cert {ssl_cert}', config)
self.assertIn(f'key {ssl_key}', config)
self.assertTrue(process_named_running(PROCESS_NAME))
self.assertIn(interface, interfaces())
# check that no interface remained after deleting them
self.session.delete(base_path)
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
self.assertNotIn(interface, interfaces())
def test_server_interfaces(self):
""" Create OpenVPN server interfaces using different client subnets.
Validate configuration afterwards. """
auth_hash = 'sha256'
num_range = range(20, 25)
port = ''
for ii in num_range:
interface = f'vtun{ii}'
subnet = f'192.0.{ii}.0/24'
path = base_path + [interface]
port = str(2000 + ii)
self.session.set(path + ['device-type', 'tun'])
self.session.set(path + ['encryption', 'cipher', 'aes192'])
self.session.set(path + ['hash', auth_hash])
self.session.set(path + ['mode', 'server'])
self.session.set(path + ['local-port', port])
self.session.set(path + ['server', 'subnet', subnet])
self.session.set(path + ['tls', 'ca-cert-file', ca_cert])
self.session.set(path + ['tls', 'cert-file', ssl_cert])
self.session.set(path + ['tls', 'key-file', ssl_key])
self.session.set(path + ['tls', 'dh-file', dh_pem])
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
subnet = f'192.0.{ii}.0/24'
port = str(2000 + ii)
config_file = f'/run/openvpn/{interface}.conf'
config = read_file(config_file)
self.assertIn(f'dev {interface}', config)
self.assertIn(f'dev-type tun', config)
self.assertIn(f'persist-key', config)
self.assertIn(f'proto udp', config) # default protocol
self.assertIn(f'auth {auth_hash}', config)
self.assertIn(f'cipher aes-192-cbc', config)
self.assertIn(f'topology net30', config)
self.assertIn(f'lport {port}', config)
# TLS options
self.assertIn(f'ca {ca_cert}', config)
self.assertIn(f'cert {ssl_cert}', config)
self.assertIn(f'key {ssl_key}', config)
self.assertIn(f'dh {dh_pem}', config)
# IP pool configuration
netmask = IPv4Network(subnet).netmask
network = IPv4Network(subnet).network_address
self.assertIn(f'server {network} {netmask} nopool', config)
self.assertTrue(process_named_running(PROCESS_NAME))
self.assertIn(interface, interfaces())
# check that no interface remained after deleting them
self.session.delete(base_path)
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
self.assertNotIn(interface, interfaces())
def test_site2site_interfaces(self):
""" Create two OpenVPN site-to-site interfaces """
num_range = range(30, 35)
port = ''
local_address = ''
remote_address = ''
for ii in num_range:
interface = f'vtun{ii}'
local_address = f'192.0.{ii}.1'
remote_address = f'172.16.{ii}.1'
path = base_path + [interface]
port = str(3000 + ii)
self.session.set(path + ['mode', 'site-to-site'])
self.session.set(path + ['local-port', port])
self.session.set(path + ['local-address', local_address])
self.session.set(path + ['remote-port', port])
self.session.set(path + ['shared-secret-key-file', s2s_key])
self.session.set(path + ['remote-address', remote_address])
self.session.set(path + ['vrf', vrf_name])
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
local_address = f'192.0.{ii}.1'
remote_address = f'172.16.{ii}.1'
port = str(3000 + ii)
config_file = f'/run/openvpn/{interface}.conf'
config = read_file(config_file)
self.assertIn(f'dev {interface}', config)
self.assertIn(f'dev-type tun', config)
self.assertIn(f'secret {s2s_key}', config)
self.assertIn(f'lport {port}', config)
self.assertIn(f'rport {port}', config)
self.assertIn(f'ifconfig {local_address} {remote_address}', config)
self.assertTrue(process_named_running(PROCESS_NAME))
self.assertIn(interface, interfaces())
# check that no interface remained after deleting them
self.session.delete(base_path)
self.session.commit()
for ii in num_range:
interface = f'vtun{ii}'
self.assertNotIn(interface, interfaces())
if __name__ == '__main__':
# Our SSL certificates need a subject ...
subject = '/C=DE/ST=BY/O=VyOS/localityName=Cloud/commonName=vyos/' \
'organizationalUnitName=VyOS/emailAddress=maintainers@vyos.io/'
if (not os.path.isfile(ssl_key) and not os.path.isfile(ssl_cert) and
not os.path.isfile(ca_cert) and not os.path.isfile(dh_pem) and
not os.path.isfile(s2s_key)):
# Generate mandatory SSL certificate
tmp = f'openssl req -newkey rsa:4096 -new -nodes -x509 -days 3650 '\
f'-keyout {ssl_key} -out {ssl_cert} -subj {subject}'
out = cmd(tmp)
print(out)
# Generate "CA"
tmp = f'openssl req -new -x509 -key {ssl_key} -out {ca_cert} -subj {subject}'
out = cmd(tmp)
print(out)
# Generate "DH" key
tmp = f'openssl dhparam -out {dh_pem} 2048'
out = cmd(tmp)
print(out)
# Generate site-2-site key
tmp = f'openvpn --genkey --secret {s2s_key}'
out = cmd(tmp)
print(out)
for file in [ca_cert, ssl_cert, ssl_key, dh_pem, s2s_key]:
cmd(f'sudo chown openvpn:openvpn {file}')
unittest.main()

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