#!/usr/bin/env python3 # # Copyright (C) 2019-2020 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 . import os import re from copy import deepcopy from socket import AF_INET, SOCK_STREAM, socket from sys import exit from time import sleep from jinja2 import FileSystemLoader, Environment from vyos.config import Config from vyos.defaults import directories as vyos_data_dir from vyos import ConfigError from vyos.util import run pidfile = r'/var/run/accel_l2tp.pid' l2tp_cnf_dir = r'/etc/accel-ppp/l2tp' chap_secrets = l2tp_cnf_dir + '/chap-secrets' l2tp_conf = l2tp_cnf_dir + '/l2tp.config' # accel-pppd -d -c /etc/accel-ppp/l2tp/l2tp.config -p /var/run/accel_l2tp.pid # config path creation if not os.path.exists(l2tp_cnf_dir): os.makedirs(l2tp_cnf_dir) default_config_data = { 'authentication': { 'mode': 'local', 'local-users': { }, 'radiussrv': {}, 'radiusopt': {}, 'auth_proto': [], 'mppe': 'prefer' }, 'outside_addr': '', 'gateway_address': '10.255.255.0', 'dns': [], 'dnsv6': [], 'wins': [], 'client_ip_pool': None, 'client_ip_subnets': [], 'client_ipv6_pool': {}, 'mtu': '1436', 'ip6_column': '', 'ip6_dp_column': '', 'ppp_options': {}, } ### # inline helper functions ### # depending on hw and threads, daemon needs a little to start # if it takes longer than 100 * 0.5 secs, exception is being raised # not sure if that's the best way to check it, but it worked so far quite well ### def chk_con(): cnt = 0 s = socket(AF_INET, SOCK_STREAM) while True: try: s.connect(("127.0.0.1", 2004)) break except ConnectionRefusedError: sleep(0.5) cnt += 1 if cnt == 100: raise("failed to start l2tp server") break def _accel_cmd(command): return run(f'/usr/bin/accel-cmd -p 2004 {command}') ### # inline helper functions end ### def get_config(): c = Config() base = ['vpn', 'l2tp' 'remote-access'] if not c.exists(base): return None c.set_level(base) config_data = deepcopy(default_config_data) ### general options ### if c.exists('dns-servers server-1'): config_data['dns'].append(c.return_value('dns-servers server-1')) if c.exists('dns-servers server-2'): config_data['dns'].append(c.return_value('dns-servers server-2')) if c.exists('dnsv6-servers'): for dns6_server in c.return_values('dnsv6-servers'): config_data['dnsv6'].append(dns6_server) if c.exists('wins-servers server-1'): config_data['wins'].append(c.return_value('wins-servers server-1')) if c.exists('wins-servers server-2'): config_data['wins'].append(c.return_value('wins-servers server-2')) if c.exists('outside-address'): config_data['outside_addr'] = c.return_value('outside-address') # auth local if c.exists('authentication mode local'): if c.exists('authentication local-users username'): for usr in c.list_nodes('authentication local-users username'): config_data['authentication']['local-users'].update( { usr: { 'passwd': '', 'state': 'enabled', 'ip': '*', 'upload': None, 'download': None } } ) if c.exists('authentication local-users username ' + usr + ' password'): config_data['authentication']['local-users'][usr]['passwd'] = c.return_value( 'authentication local-users username ' + usr + ' password') if c.exists('authentication local-users username ' + usr + ' disable'): config_data['authentication']['local-users'][usr]['state'] = 'disable' if c.exists('authentication local-users username ' + usr + ' static-ip'): config_data['authentication']['local-users'][usr]['ip'] = c.return_value( 'authentication local-users username ' + usr + ' static-ip') if c.exists('authentication local-users username ' + usr + ' rate-limit download'): config_data['authentication']['local-users'][usr]['download'] = c.return_value( 'authentication local-users username ' + usr + ' rate-limit download') if c.exists('authentication local-users username ' + usr + ' rate-limit upload'): config_data['authentication']['local-users'][usr]['upload'] = c.return_value( 'authentication local-users username ' + usr + ' rate-limit upload') # authentication mode radius servers and settings if c.exists('authentication mode radius'): config_data['authentication']['mode'] = 'radius' rsrvs = c.list_nodes('authentication radius server') for rsrv in rsrvs: if c.return_value('authentication radius server ' + rsrv + ' fail-time') == None: ftime = '0' else: ftime = str(c.return_value( 'authentication radius server ' + rsrv + ' fail-time')) if c.return_value('authentication radius-server ' + rsrv + ' req-limit') == None: reql = '0' else: reql = str(c.return_value( 'authentication radius server ' + rsrv + ' req-limit')) config_data['authentication']['radiussrv'].update( { rsrv: { 'secret': c.return_value('authentication radius server ' + rsrv + ' key'), 'fail-time': ftime, 'req-limit': reql } } ) # Source ip address feature if c.exists('authentication radius source-address'): config_data['authentication']['radius_source_address'] = c.return_value( 'authentication radius source-address') # advanced radius-setting if c.exists('authentication radius acct-timeout'): config_data['authentication']['radiusopt']['acct-timeout'] = c.return_value( 'authentication radius acct-timeout') if c.exists('authentication radius max-try'): config_data['authentication']['radiusopt']['max-try'] = c.return_value( 'authentication radius max-try') if c.exists('authentication radius timeout'): config_data['authentication']['radiusopt']['timeout'] = c.return_value( 'authentication radius timeout') if c.exists('authentication radius nas-identifier'): config_data['authentication']['radiusopt']['nas-id'] = c.return_value( 'authentication radius nas-identifier') if c.exists('authentication radius dae-server'): # Set default dae-server port if not defined if c.exists('authentication radius dae-server port'): dae_server_port = c.return_value( 'authentication radius dae-server port') else: dae_server_port = "3799" config_data['authentication']['radiusopt'].update( { 'dae-srv': { 'ip-addr': c.return_value('authentication radius dae-server ip-address'), 'port': dae_server_port, 'secret': str(c.return_value('authentication radius dae-server secret')) } } ) # filter-id is the internal accel default if attribute is empty # set here as default for visibility which may change in the future if c.exists('authentication radius rate-limit enable'): if not c.exists('authentication radius rate-limit attribute'): config_data['authentication']['radiusopt']['shaper'] = { 'attr': 'Filter-Id' } else: config_data['authentication']['radiusopt']['shaper'] = { 'attr': c.return_value('authentication radius rate-limit attribute') } if c.exists('authentication radius rate-limit vendor'): config_data['authentication']['radiusopt']['shaper']['vendor'] = c.return_value( 'authentication radius rate-limit vendor') if c.exists('client-ip-pool'): if c.exists('client-ip-pool start') and c.exists('client-ip-pool stop'): config_data['client_ip_pool'] = c.return_value( 'client-ip-pool start') + '-' + re.search('[0-9]+$', c.return_value('client-ip-pool stop')).group(0) if c.exists('client-ip-pool subnet'): config_data['client_ip_subnets'] = c.return_values( 'client-ip-pool subnet') if c.exists('client-ipv6-pool prefix'): config_data['client_ipv6_pool']['prefix'] = c.return_values( 'client-ipv6-pool prefix') config_data['ip6_column'] = 'ip6,' if c.exists('client-ipv6-pool delegate-prefix'): config_data['client_ipv6_pool']['delegate_prefix'] = c.return_values( 'client-ipv6-pool delegate-prefix') config_data['ip6_dp_column'] = 'ip6-dp,' if c.exists('mtu'): config_data['mtu'] = c.return_value('mtu') # gateway address if c.exists('gateway-address'): config_data['gateway_address'] = c.return_value('gateway-address') else: # calculate gw-ip-address if c.exists('client-ip-pool start'): # use start ip as gw-ip-address config_data['gateway_address'] = c.return_value( 'client-ip-pool start') elif c.exists('client-ip-pool subnet'): # use first ip address from first defined pool lst_ip = re.findall("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}", c.return_values( 'client-ip-pool subnet')[0]) config_data['gateway_address'] = lst_ip[0] if c.exists('authentication require'): auth_mods = {'pap': 'pap', 'chap': 'auth_chap_md5', 'mschap': 'auth_mschap_v1', 'mschap-v2': 'auth_mschap_v2'} for proto in c.return_values('authentication require'): config_data['authentication']['auth_proto'].append( auth_mods[proto]) else: config_data['authentication']['auth_proto'] = ['auth_mschap_v2'] if c.exists('authentication mppe'): config_data['authentication']['mppe'] = c.return_value( 'authentication mppe') if c.exists('idle'): config_data['idle_timeout'] = c.return_value('idle') # LNS secret if c.exists('lns shared-secret'): config_data['lns_shared_secret'] = c.return_value('lns shared-secret') if c.exists('ccp-disable'): config_data['ccp_disable'] = True # ppp_options ppp_options = {} if c.exists('ppp-options'): if c.exists('ppp-options lcp-echo-failure'): ppp_options['lcp-echo-failure'] = c.return_value( 'ppp-options lcp-echo-failure') if c.exists('ppp-options lcp-echo-interval'): ppp_options['lcp-echo-interval'] = c.return_value( 'ppp-options lcp-echo-interval') if len(ppp_options) != 0: config_data['ppp_options'] = ppp_options return config_data def verify(c): if c == None: return None if c['authentication']['mode'] == 'local': if not c['authentication']['local-users']: raise ConfigError( 'l2tp-server authentication local-users required') for usr in c['authentication']['local-users']: if not c['authentication']['local-users'][usr]['passwd']: raise ConfigError('user ' + usr + ' requires a password') if c['authentication']['mode'] == 'radius': if len(c['authentication']['radiussrv']) == 0: raise ConfigError('radius server required') for rsrv in c['authentication']['radiussrv']: if c['authentication']['radiussrv'][rsrv]['secret'] == None: raise ConfigError('radius server ' + rsrv + ' needs a secret configured') # check for the existence of a client ip pool if not c['client_ip_pool'] and not c['client_ip_subnets']: raise ConfigError( "set vpn l2tp remote-access client-ip-pool requires subnet or start/stop IP pool") # check ipv6 if 'delegate_prefix' in c['client_ipv6_pool'] and not 'prefix' in c['client_ipv6_pool']: raise ConfigError( "\"set vpn l2tp remote-access client-ipv6-pool prefix\" required for delegate-prefix ") if len(c['dnsv6']) > 3: raise ConfigError("Maximum allowed dnsv6-servers addresses is 3") def generate(c): if c == None: return None # Prepare Jinja2 template loader from files tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'l2tp') fs_loader = FileSystemLoader(tmpl_path) env = Environment(loader=fs_loader, trim_blocks=True) # accel-cmd reload doesn't work so any change results in a restart of the daemon try: if os.cpu_count() == 1: c['thread_cnt'] = 1 else: c['thread_cnt'] = int(os.cpu_count()/2) except KeyError: if os.cpu_count() == 1: c['thread_cnt'] = 1 else: c['thread_cnt'] = int(os.cpu_count()/2) tmpl = env.get_template('l2tp.config.tmpl') config_text = tmpl.render(c) open(l2tp_conf, 'w').write(config_text) if c['authentication']['local-users']: tmpl = env.get_template('chap-secrets.tmpl') chap_secrets_txt = tmpl.render(c) old_umask = os.umask(0o077) open(chap_secrets, 'w').write(chap_secrets_txt) os.umask(old_umask) return c def apply(c): if c == None: if os.path.exists(pidfile): _accel_cmd('shutdown hard') if os.path.exists(pidfile): os.remove(pidfile) return None if not os.path.exists(pidfile): ret = run(f'/usr/sbin/accel-pppd -c {l2tp_conf} -p {pidfile} -d') chk_con() if ret != 0 and os.path.exists(pidfile): os.remove(pidfile) raise ConfigError('accel-pppd failed to start') else: # if gw ip changes, only restart doesn't work _accel_cmd('restart') if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)