#!/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 import re from copy import deepcopy from stat import S_IRUSR, S_IWUSR, S_IRGRP from sys import exit from vyos.config import Config from vyos.template import render from vyos.util import call, get_half_cpus from vyos import ConfigError from vyos import airbag airbag.enable() pptp_conf = '/run/accel-pppd/pptp.conf' pptp_chap_secrets = '/run/accel-pppd/pptp.chap-secrets' default_pptp = { 'auth_mode' : 'local', 'local_users' : [], 'radius_server' : [], 'radius_acct_inter_jitter': '', 'radius_acct_tmo' : '30', 'radius_max_try' : '3', 'radius_timeout' : '30', 'radius_nas_id' : '', 'radius_nas_ip' : '', 'radius_source_address' : '', 'radius_shaper_attr' : '', 'radius_shaper_vendor': '', 'radius_dynamic_author' : '', 'chap_secrets_file': pptp_chap_secrets, # used in Jinja2 template 'outside_addr': '', 'dnsv4': [], 'wins': [], 'client_ip_pool': '', 'mtu': '1436', 'auth_proto' : ['auth_mschap_v2'], 'ppp_mppe' : 'prefer', 'thread_cnt': get_half_cpus() } def get_config(config=None): if config: conf = config else: conf = Config() base_path = ['vpn', 'pptp', 'remote-access'] if not conf.exists(base_path): return None pptp = deepcopy(default_pptp) conf.set_level(base_path) if conf.exists(['name-server']): pptp['dnsv4'] = conf.return_values(['name-server']) if conf.exists(['wins-server']): pptp['wins'] = conf.return_values(['wins-server']) if conf.exists(['outside-address']): pptp['outside_addr'] = conf.return_value(['outside-address']) if conf.exists(['authentication', 'mode']): pptp['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' : '*', } 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 not conf.exists(['disable']): pptp['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', 'acct_port' : '1813' } conf.set_level(base_path + ['authentication', 'radius', 'server', server]) if conf.exists(['disable-accounting']): radius['acct_port'] = '0' 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(['acct-port']): radius['acct_port'] = conf.return_value(['acct-port']) if conf.exists(['key']): radius['key'] = conf.return_value(['key']) if not conf.exists(['disable']): pptp['radius_server'].append(radius) # # advanced radius-setting conf.set_level(base_path + ['authentication', 'radius']) if conf.exists(['acct-interim-jitter']): pptp['radius_acct_inter_jitter'] = conf.return_value(['acct-interim-jitter']) if conf.exists(['acct-timeout']): pptp['radius_acct_tmo'] = conf.return_value(['acct-timeout']) if conf.exists(['max-try']): pptp['radius_max_try'] = conf.return_value(['max-try']) if conf.exists(['timeout']): pptp['radius_timeout'] = conf.return_value(['timeout']) if conf.exists(['nas-identifier']): pptp['radius_nas_id'] = conf.return_value(['nas-identifier']) if conf.exists(['nas-ip-address']): pptp['radius_nas_ip'] = conf.return_value(['nas-ip-address']) if conf.exists(['source-address']): pptp['radius_source_address'] = conf.return_value(['source-address']) # Dynamic Authorization Extensions (DOA)/Change Of Authentication (COA) if conf.exists(['dae-server']): dae = { 'port' : '', 'server' : '', 'key' : '' } if conf.exists(['dynamic-author', 'ip-address']): dae['server'] = conf.return_value(['dynamic-author', 'ip-address']) 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']) pptp['radius_dynamic_author'] = dae if conf.exists(['rate-limit', 'enable']): pptp['radius_shaper_attr'] = 'Filter-Id' c_attr = ['rate-limit', 'enable', 'attribute'] if conf.exists(c_attr): pptp['radius_shaper_attr'] = conf.return_value(c_attr) c_vendor = ['rate-limit', 'enable', 'vendor'] if conf.exists(c_vendor): pptp['radius_shaper_vendor'] = conf.return_value(c_vendor) conf.set_level(base_path) if conf.exists(['client-ip-pool']): if conf.exists(['client-ip-pool', 'start']) and conf.exists(['client-ip-pool', 'stop']): start = conf.return_value(['client-ip-pool', 'start']) stop = conf.return_value(['client-ip-pool', 'stop']) pptp['client_ip_pool'] = start + '-' + re.search('[0-9]+$', stop).group(0) if conf.exists(['mtu']): pptp['mtu'] = conf.return_value(['mtu']) # gateway address if conf.exists(['gateway-address']): pptp['gw_ip'] = conf.return_value(['gateway-address']) else: # calculate gw-ip-address if conf.exists(['client-ip-pool', 'start']): # use start ip as gw-ip-address pptp['gateway_address'] = conf.return_value(['client-ip-pool', 'start']) if conf.exists(['authentication', 'require']): # clear default list content, now populate with actual CLI values pptp['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(['authentication', 'require']): pptp['auth_proto'].append(auth_mods[proto]) if conf.exists(['authentication', 'mppe']): pptp['ppp_mppe'] = conf.return_value(['authentication', 'mppe']) return pptp def verify(pptp): if not pptp: return None if pptp['auth_mode'] == 'local': if not pptp['local_users']: raise ConfigError('PPTP local auth mode requires local users to be configured!') for user in pptp['local_users']: username = user['name'] if not user['password']: raise ConfigError(f'Password required for local user "{username}"') elif pptp['auth_mode'] == 'radius': if len(pptp['radius_server']) == 0: raise ConfigError('RADIUS authentication requires at least one server') for radius in pptp['radius_server']: if not radius['key']: server = radius['server'] raise ConfigError(f'Missing RADIUS secret key for server "{ server }"') if len(pptp['dnsv4']) > 2: raise ConfigError('Not more then two IPv4 DNS name-servers can be configured') if len(pptp['wins']) > 2: raise ConfigError('Not more then two IPv4 WINS name-servers can be configured') def generate(pptp): if not pptp: return None render(pptp_conf, 'accel-ppp/pptp.config.j2', pptp) if pptp['local_users']: render(pptp_chap_secrets, 'accel-ppp/chap-secrets.j2', pptp) os.chmod(pptp_chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP) else: if os.path.exists(pptp_chap_secrets): os.unlink(pptp_chap_secrets) def apply(pptp): if not pptp: call('systemctl stop accel-ppp@pptp.service') for file in [pptp_conf, pptp_chap_secrets]: if os.path.exists(file): os.unlink(file) return None call('systemctl restart accel-ppp@pptp.service') if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)