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vpn_sstp.py
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vpn_sstp.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 get_accel_dict
from vyos.configverify import verify_accel_ppp_base_service
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 dict_search
from vyos import ConfigError
from vyos import airbag
airbag.enable()
cfg_dir = '/run/accel-pppd'
sstp_conf = '/run/accel-pppd/sstp.conf'
sstp_chap_secrets = '/run/accel-pppd/sstp.chap-secrets'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['vpn', 'sstp']
if not conf.exists(base):
return None
# retrieve common dictionary keys
sstp = get_accel_dict(conf, base, sstp_chap_secrets)
if sstp:
sstp['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
return sstp
def verify(sstp):
if not sstp:
return None
verify_accel_ppp_base_service(sstp)
if 'client_ip_pool' not in sstp and 'client_ipv6_pool' not in sstp:
raise ConfigError('Client IP subnet required')
#
# SSL certificate checks
#
if not sstp['pki']:
raise ConfigError('PKI is not configured')
if 'ssl' not in sstp:
raise ConfigError('SSL missing on SSTP config')
ssl = sstp['ssl']
if 'ca_certificate' not in ssl:
raise ConfigError('SSL CA certificate missing on SSTP config')
if 'certificate' not in ssl:
raise ConfigError('SSL certificate missing on SSTP config')
cert_name = ssl['certificate']
if ssl['ca_certificate'] not in sstp['pki']['ca']:
raise ConfigError('Invalid CA certificate on SSTP config')
if cert_name not in sstp['pki']['certificate']:
raise ConfigError('Invalid certificate on SSTP config')
pki_cert = sstp['pki']['certificate'][cert_name]
if 'private' not in pki_cert or 'key' not in pki_cert['private']:
raise ConfigError('Missing private key for certificate on SSTP config')
if 'password_protected' in pki_cert['private']:
raise ConfigError('Encrypted private key is not supported on SSTP config')
def generate(sstp):
if not sstp:
return None
cert_file_path = os.path.join(cfg_dir, 'sstp-cert.pem')
cert_key_path = os.path.join(cfg_dir, 'sstp-cert.key')
ca_cert_file_path = os.path.join(cfg_dir, 'sstp-ca.pem')
cert_name = sstp['ssl']['certificate']
pki_cert = sstp['pki']['certificate'][cert_name]
with open(cert_file_path, 'w') as f:
f.write(wrap_certificate(pki_cert['certificate']))
with open(cert_key_path, 'w') as f:
f.write(wrap_private_key(pki_cert['private']['key']))
ca_cert_name = sstp['ssl']['ca_certificate']
pki_ca = sstp['pki']['ca'][ca_cert_name]
with open(ca_cert_file_path, 'w') as f:
f.write(wrap_certificate(pki_ca['certificate']))
# accel-cmd reload doesn't work so any change results in a restart of the daemon
render(sstp_conf, 'accel-ppp/sstp.config.tmpl', sstp)
if dict_search('authentication.mode', sstp) == 'local':
render(sstp_chap_secrets, 'accel-ppp/chap-secrets.config_dict.tmpl',
sstp, permission=0o640)
else:
if os.path.exists(sstp_chap_secrets):
os.unlink(sstp_chap_secrets)
return sstp
def apply(sstp):
if not sstp:
call('systemctl stop accel-ppp@sstp.service')
for file in [sstp_chap_secrets, sstp_conf]:
if os.path.exists(file):
os.unlink(file)
return None
call('systemctl restart accel-ppp@sstp.service')
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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