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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 time import sleep
from sys import exit
from copy import deepcopy
from stat import S_IRUSR, S_IWUSR, S_IRGRP
from jinja2 import FileSystemLoader, Environment
from vyos.config import Config
from vyos import ConfigError
from vyos.defaults import directories as vyos_data_dir
from vyos.util import call, run
sstp_conf = '/run/accel-pppd/sstp.conf'
sstp_chap_secrets = '/run/accel-pppd/sstp.chap-secrets'
default_config_data = {
'local_users' : [],
'auth_mode' : 'local',
'auth_proto' : ['auth_mschap_v2'],
'chap_secrets_file': sstp_chap_secrets, # used in Jinja2 template
'client_gateway': '',
'radius_server' : [],
'radius_acct_tmo' : '3',
'radius_max_try' : '3',
'radius_timeout' : '3',
'radius_nas_id' : '',
'radius_nas_ip' : '',
'radius_source_address' : '',
'radius_shaper_attr' : '',
'radius_shaper_vendor': '',
'radius_dynamic_author' : '',
'ssl_ca' : '',
'ssl_cert' : '',
'ssl_key' : '',
'client_ip_pool' : [],
'dnsv4' : [],
'mtu' : '',
'ppp_mppe' : 'prefer',
'ppp_echo_failure' : '',
'ppp_echo_interval' : '',
'ppp_echo_timeout' : '',
'thread_cnt' : 1
}
def get_config():
sstp = deepcopy(default_config_data)
base_path = ['vpn', 'sstp']
conf = Config()
if not conf.exists(base_path):
return None
conf.set_level(base_path)
cpu = os.cpu_count()
if cpu > 1:
sstp['thread_cnt'] = int(cpu/2)
if conf.exists(['authentication', 'mode']):
sstp['auth_mode'] = conf.return_value(['authentication', 'mode'])
#
# local auth
if conf.exists(['authentication', 'local-users']):
for username in conf.list_nodes(['authentication', 'local-users', 'username']):
user = {
'name' : username,
'password' : '',
'state' : 'enabled',
'ip' : '*',
'upload' : None,
'download' : None
}
conf.set_level(base_path + ['authentication', 'local-users', 'username', username])
if conf.exists(['password']):
user['password'] = conf.return_value(['password'])
if conf.exists(['disable']):
user['state'] = 'disable'
if conf.exists(['static-ip']):
user['ip'] = conf.return_value(['static-ip'])
if conf.exists(['rate-limit', 'download']):
user['download'] = conf.return_value(['rate-limit', 'download'])
if conf.exists(['rate-limit', 'upload']):
user['upload'] = conf.return_value(['rate-limit', 'upload'])
sstp['local_users'].append(user)
#
# RADIUS auth and settings
conf.set_level(base_path + ['authentication', 'radius'])
if conf.exists(['server']):
for server in conf.list_nodes(['server']):
radius = {
'server' : server,
'key' : '',
'fail_time' : 0,
'port' : '1812'
}
conf.set_level(base_path + ['authentication', 'radius', 'server', server])
if conf.exists(['fail-time']):
radius['fail-time'] = conf.return_value(['fail-time'])
if conf.exists(['port']):
radius['port'] = conf.return_value(['port'])
if conf.exists(['key']):
radius['key'] = conf.return_value(['key'])
if not conf.exists(['disable']):
sstp['radius_server'].append(radius)
#
# advanced radius-setting
conf.set_level(base_path + ['authentication', 'radius'])
if conf.exists(['acct-timeout']):
sstp['radius_acct_tmo'] = conf.return_value(['acct-timeout'])
if conf.exists(['max-try']):
sstp['radius_max_try'] = conf.return_value(['max-try'])
if conf.exists(['timeout']):
sstp['radius_timeout'] = conf.return_value(['timeout'])
if conf.exists(['nas-identifier']):
sstp['radius_nas_id'] = conf.return_value(['nas-identifier'])
if conf.exists(['nas-ip-address']):
sstp['radius_nas_ip'] = conf.return_value(['nas-ip-address'])
if conf.exists(['source-address']):
sstp['radius_source_address'] = conf.return_value(['source-address'])
# Dynamic Authorization Extensions (DOA)/Change Of Authentication (COA)
if conf.exists(['dynamic-author']):
dae = {
'port' : '',
'server' : '',
'key' : ''
}
if conf.exists(['dynamic-author', 'server']):
dae['server'] = conf.return_value(['dynamic-author', 'server'])
if conf.exists(['dynamic-author', 'port']):
dae['port'] = conf.return_value(['dynamic-author', 'port'])
if conf.exists(['dynamic-author', 'key']):
dae['key'] = conf.return_value(['dynamic-author', 'key'])
sstp['radius_dynamic_author'] = dae
if conf.exists(['rate-limit', 'enable']):
sstp['radius_shaper_attr'] = 'Filter-Id'
c_attr = ['rate-limit', 'enable', 'attribute']
if conf.exists(c_attr):
sstp['radius_shaper_attr'] = conf.return_value(c_attr)
c_vendor = ['rate-limit', 'enable', 'vendor']
if conf.exists(c_vendor):
sstp['radius_shaper_vendor'] = conf.return_value(c_vendor)
#
# authentication protocols
conf.set_level(base_path + ['authentication'])
if conf.exists(['protocols']):
# clear default list content, now populate with actual CLI values
sstp['auth_proto'] = []
auth_mods = {
'pap': 'auth_pap',
'chap': 'auth_chap_md5',
'mschap': 'auth_mschap_v1',
'mschap-v2': 'auth_mschap_v2'
}
for proto in conf.return_values(['protocols']):
sstp['auth_proto'].append(auth_mods[proto])
#
# read in SSL certs
conf.set_level(base_path + ['ssl'])
if conf.exists(['ca-cert-file']):
sstp['ssl_ca'] = conf.return_value(['ca-cert-file'])
if conf.exists(['cert-file']):
sstp['ssl_cert'] = conf.return_value(['cert-file'])
if conf.exists(['key-file']):
sstp['ssl_key'] = conf.return_value(['key-file'])
#
# read in client ip pool settings
conf.set_level(base_path + ['network-settings', 'client-ip-settings'])
if conf.exists(['subnet']):
sstp['client_ip_pool'] = conf.return_values(['subnet'])
if conf.exists(['gateway-address']):
sstp['client_gateway'] = conf.return_value(['gateway-address'])
#
# read in network settings
conf.set_level(base_path + ['network-settings'])
if conf.exists(['name-server']):
sstp['dnsv4'] = conf.return_values(['name-server'])
if conf.exists(['mtu']):
sstp['mtu'] = conf.return_value(['mtu'])
#
# read in PPP stuff
conf.set_level(base_path + ['ppp-settings'])
if conf.exists('mppe'):
sstp['ppp_mppe'] = conf.return_value(['ppp-settings', 'mppe'])
if conf.exists(['lcp-echo-failure']):
sstp['ppp_echo_failure'] = conf.return_value(['lcp-echo-failure'])
if conf.exists(['lcp-echo-interval']):
sstp['ppp_echo_interval'] = conf.return_value(['lcp-echo-interval'])
if conf.exists(['lcp-echo-timeout']):
sstp['ppp_echo_timeout'] = conf.return_value(['lcp-echo-timeout'])
return sstp
def verify(sstp):
if sstp is None:
return None
# vertify auth settings
if sstp['auth_mode'] == 'local':
if not sstp['local_users']:
raise ConfigError('SSTP local auth mode requires local users to be configured!')
for user in sstp['local_users']:
if not user['password']:
raise ConfigError(f"Password required for user {user['name']}")
# if up/download is set, check that both have a value
if user['upload'] and not user['download']:
raise ConfigError(f"Download speed value required for user {user['name']}")
if user['download'] and not user['upload']:
raise ConfigError(f"Upload speed value required for user {user['name']}")
if not sstp['client_ip_pool']:
raise ConfigError("Client IP subnet required")
if not sstp['client_gateway']:
raise ConfigError("Client gateway IP address required")
if len(sstp['dnsv4']) > 2:
raise ConfigError('Not more then two IPv4 DNS name-servers can be configured')
if not sstp['ssl_ca'] or not sstp['ssl_cert'] or not sstp['ssl_key']:
raise ConfigError('One or more SSL certificates missing')
if not os.path.exists(sstp['ssl_ca']):
raise ConfigError(f"CA cert file {sstp['ssl_ca']} does not exist")
if not os.path.exists(sstp['ssl_cert']):
raise ConfigError(f"SSL cert file {sstp['ssl_cert']} does not exist")
if not os.path.exists(sstp['ssl_key']):
raise ConfigError(f"SSL key file {sstp['ssl_key']} does not exist")
if sstp['auth_mode'] == 'radius':
if len(sstp['radius_server']) == 0:
raise ConfigError("RADIUS authentication requires at least one server")
for radius in sstp['radius_server']:
if not radius['key']:
raise ConfigError(f"Missing RADIUS secret for server {{ radius['key'] }}")
def generate(sstp):
if not sstp:
return None
import pprint
pprint.pprint(sstp)
# Prepare Jinja2 template loader from files
tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'sstp')
fs_loader = FileSystemLoader(tmpl_path)
env = Environment(loader=fs_loader, trim_blocks=True)
dirname = os.path.dirname(sstp_conf)
if not os.path.exists(dirname):
os.mkdir(dirname)
# accel-cmd reload doesn't work so any change results in a restart of the daemon
tmpl = env.get_template('sstp.config.tmpl')
config_text = tmpl.render(sstp)
with open(sstp_conf, 'w') as f:
f.write(config_text)
if sstp['local_users']:
tmpl = env.get_template('chap-secrets.tmpl')
config_text = tmpl.render(sstp)
with open(sstp_chap_secrets, 'w') as f:
f.write(config_text)
os.chmod(sstp_chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP)
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')
if os.path.exists(sstp_conf):
os.unlink(sstp_conf)
if os.path.exists(sstp_chap_secrets):
os.unlink(sstp_chap_secrets)
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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