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vpn_openconnect.py
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vpn_openconnect.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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
from sys import exit
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.pki import wrap_certificate
from vyos.pki import wrap_private_key
from vyos.template import render
from vyos.util import call
from vyos.util import is_systemd_service_running
from vyos.xml import defaults
from vyos import ConfigError
from crypt import crypt, mksalt, METHOD_SHA512
from time import sleep
from vyos import airbag
airbag.enable()
cfg_dir = '/run/ocserv'
ocserv_conf = cfg_dir + '/ocserv.conf'
ocserv_passwd = cfg_dir + '/ocpasswd'
radius_cfg = cfg_dir + '/radiusclient.conf'
radius_servers = cfg_dir + '/radius_servers'
# Generate hash from user cleartext password
def get_hash(password):
return crypt(password, mksalt(METHOD_SHA512))
def get_config():
conf = Config()
base = ['vpn', 'openconnect']
if not conf.exists(base):
return None
ocserv = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
ocserv = dict_merge(default_values, ocserv)
if ocserv:
ocserv['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
return ocserv
def verify(ocserv):
if ocserv is None:
return None
# Check authentication
if "authentication" in ocserv:
if "mode" in ocserv["authentication"]:
if "local" in ocserv["authentication"]["mode"]:
if not ocserv["authentication"]["local_users"] or not ocserv["authentication"]["local_users"]["username"]:
raise ConfigError('openconnect mode local required at leat one user')
else:
for user in ocserv["authentication"]["local_users"]["username"]:
if not "password" in ocserv["authentication"]["local_users"]["username"][user]:
raise ConfigError(f'password required for user {user}')
else:
raise ConfigError('openconnect authentication mode required')
else:
raise ConfigError('openconnect authentication credentials required')
# Check ssl
if 'ssl' not in ocserv:
raise ConfigError('openconnect ssl required')
if not ocserv['pki'] or 'certificate' not in ocserv['pki']:
raise ConfigError('PKI not configured')
ssl = ocserv['ssl']
if 'certificate' not in ssl:
raise ConfigError('openconnect ssl certificate required')
cert_name = ssl['certificate']
if cert_name not in ocserv['pki']['certificate']:
raise ConfigError('Invalid openconnect ssl certificate')
cert = ocserv['pki']['certificate'][cert_name]
if 'certificate' not in cert:
raise ConfigError('Missing certificate in PKI')
if 'private' not in cert or 'key' not in cert['private']:
raise ConfigError('Missing private key in PKI')
if 'ca_certificate' in ssl:
if 'ca' not in ocserv['pki']:
raise ConfigError('PKI not configured')
if ssl['ca_certificate'] not in ocserv['pki']['ca']:
raise ConfigError('Invalid openconnect ssl CA certificate')
# Check network settings
if "network_settings" in ocserv:
if "push_route" in ocserv["network_settings"]:
# Replace default route
if "0.0.0.0/0" in ocserv["network_settings"]["push_route"]:
ocserv["network_settings"]["push_route"].remove("0.0.0.0/0")
ocserv["network_settings"]["push_route"].append("default")
else:
ocserv["network_settings"]["push_route"] = "default"
else:
raise ConfigError('openconnect network settings required')
def generate(ocserv):
if not ocserv:
return None
if "radius" in ocserv["authentication"]["mode"]:
# Render radius client configuration
render(radius_cfg, 'ocserv/radius_conf.tmpl', ocserv["authentication"]["radius"])
# Render radius servers
render(radius_servers, 'ocserv/radius_servers.tmpl', ocserv["authentication"]["radius"])
else:
if "local_users" in ocserv["authentication"]:
for user in ocserv["authentication"]["local_users"]["username"]:
ocserv["authentication"]["local_users"]["username"][user]["hash"] = get_hash(ocserv["authentication"]["local_users"]["username"][user]["password"])
# Render local users
render(ocserv_passwd, 'ocserv/ocserv_passwd.tmpl', ocserv["authentication"]["local_users"])
if "ssl" in ocserv:
cert_file_path = os.path.join(cfg_dir, 'cert.pem')
cert_key_path = os.path.join(cfg_dir, 'cert.key')
ca_cert_file_path = os.path.join(cfg_dir, 'ca.pem')
if 'certificate' in ocserv['ssl']:
cert_name = ocserv['ssl']['certificate']
pki_cert = ocserv['pki']['certificate'][cert_name]
with open(cert_file_path, 'w') as f:
f.write(wrap_certificate(pki_cert['certificate']))
if 'private' in pki_cert and 'key' in pki_cert['private']:
with open(cert_key_path, 'w') as f:
f.write(wrap_private_key(pki_cert['private']['key']))
if 'ca_certificate' in ocserv['ssl']:
ca_name = ocserv['ssl']['ca_certificate']
pki_ca_cert = ocserv['pki']['ca'][ca_name]
with open(ca_cert_file_path, 'w') as f:
f.write(wrap_certificate(pki_ca_cert['certificate']))
# Render config
render(ocserv_conf, 'ocserv/ocserv_config.tmpl', ocserv)
def apply(ocserv):
if not ocserv:
call('systemctl stop ocserv.service')
for file in [ocserv_conf, ocserv_passwd]:
if os.path.exists(file):
os.unlink(file)
else:
call('systemctl restart ocserv.service')
counter = 0
while True:
# exit early when service runs
if is_systemd_service_running("ocserv.service"):
break
sleep(0.250)
if counter > 5:
raise ConfigError('openconnect failed to start, check the logs for details')
break
counter += 1
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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