#!/usr/bin/env python3 # # Copyright (C) 2019 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 sys import os import re import subprocess import jinja2 import socket import time import syslog as sl from vyos.config import Config from vyos import ConfigError 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) sl.syslog(sl.LOG_NOTICE, l2tp_cnf_dir + " created") l2tp_config = ''' ### generated by accel_l2tp.py ### [modules] log_syslog l2tp chap-secrets {% for proto in authentication['auth_proto']: %} {{proto}} {% endfor%} {% if authentication['mode'] == 'radius' %} radius {% endif -%} ippool shaper ipv6pool ipv6_nd ipv6_dhcp [core] thread-count={{thread_cnt}} [log] syslog=accel-l2tp,daemon copy=1 level=5 {% if dns %} [dns] {% if dns[0] %} dns1={{dns[0]}} {% endif %} {% if dns[1] %} dns2={{dns[1]}} {% endif %} {% endif -%} {% if dnsv6 %} [ipv6-dns] {% for srv in dnsv6: %} {{srv}} {% endfor %} {% endif %} {% if wins %} [wins] {% if wins[0] %} wins1={{wins[0]}} {% endif %} {% if wins[1] %} wins2={{wins[1]}} {% endif %} {% endif -%} [l2tp] verbose=1 ifname=l2tp%d ppp-max-mtu={{mtu}} mppe={{authentication['mppe']}} {% if outside_addr %} bind={{outside_addr}} {% endif %} {% if lns_shared_secret %} secret={{lns_shared_secret}} {% endif %} [client-ip-range] 0.0.0.0/0 {% if (client_ip_pool) or (client_ip_subnets) %} [ip-pool] {% if client_ip_pool %} {{client_ip_pool}} {% endif -%} {% if client_ip_subnets %} {% for sn in client_ip_subnets %} {{sn}} {% endfor -%} {% endif %} {% endif %} {% if outside_nexthop %} gw-ip-address={{outside_nexthop}} {% endif %} {% if authentication['mode'] == 'local' %} [chap-secrets] chap-secrets=/etc/accel-ppp/l2tp/chap-secrets {% if outside_nexthop %} gw-ip-address={{outside_nexthop}} {% endif %} {% endif %} [ppp] verbose=1 check-ip=1 single-session=replace {% if idle_timeout %} lcp-echo-timeout={{idle_timeout}} {% endif %} {% if ppp_options['lcp-echo-interval'] %} lcp-echo-interval={{ppp_options['lcp-echo-interval']}} {% else %} lcp-echo-interval=30 {% endif %} {% if ppp_options['lcp-echo-failure'] %} lcp-echo-failure={{ppp_options['lcp-echo-failure']}} {% else %} lcp-echo-failure=3 {% endif %} {% if ccp_disable %} ccp=0 {% endif %} {% if client_ipv6_pool %} ipv6=allow {% endif %} {% if authentication['mode'] == 'radius' %} [radius] {% for rsrv in authentication['radiussrv']: %} server={{rsrv}},{{authentication['radiussrv'][rsrv]['secret']}},\ req-limit={{authentication['radiussrv'][rsrv]['req-limit']}},\ fail-time={{authentication['radiussrv'][rsrv]['fail-time']}} {% endfor %} {% if authentication['radiusopt']['timeout'] %} timeout={{authentication['radiusopt']['timeout']}} {% endif %} {% if authentication['radiusopt']['acct-timeout'] %} acct-timeout={{authentication['radiusopt']['acct-timeout']}} {% endif %} {% if authentication['radiusopt']['max-try'] %} max-try={{authentication['radiusopt']['max-try']}} {% endif %} {% if authentication['radiusopt']['nas-id'] %} nas-identifier={{authentication['radiusopt']['nas-id']}} {% endif %} {% if authentication['radius_source_address'] %} nas-ip-address={{authentication['radius_source_address']}} {% endif -%} {% if authentication['radiusopt']['dae-srv'] %} dae-server={{authentication['radiusopt']['dae-srv']['ip-addr']}}:\ {{authentication['radiusopt']['dae-srv']['port']}},\ {{authentication['radiusopt']['dae-srv']['secret']}} {% endif -%} gw-ip-address={{outside_nexthop}} verbose=1 {% endif -%} {% if client_ipv6_pool %} [ipv6-pool] {% for prfx in client_ipv6_pool.prefix: %} {{prfx}} {% endfor %} {% for prfx in client_ipv6_pool.delegate_prefix: %} delegate={{prfx}} {% endfor %} {% endif %} {% if client_ipv6_pool['delegate_prefix'] %} [ipv6-dhcp] verbose=1 {% endif %} {% if authentication['radiusopt']['shaper'] %} [shaper] verbose=1 attr={{authentication['radiusopt']['shaper']['attr']}} {% if authentication['radiusopt']['shaper']['vendor'] %} vendor={{authentication['radiusopt']['shaper']['vendor']}} {% endif -%} {% endif %} [cli] tcp=127.0.0.1:2004 sessions-columns=ifname,username,calling-sid,ip,{{ip6_column}}{{ip6_dp_column}}rate-limit,type,comp,state,rx-bytes,tx-bytes,uptime ''' ### l2tp chap secrets chap_secrets_conf = ''' # username server password acceptable local IP addresses shaper {% for user in authentication['local-users'] %} {% if authentication['local-users'][user]['state'] == 'enabled' %} {% if (authentication['local-users'][user]['upload']) and (authentication['local-users'][user]['download']) %} {{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}}\t\ {{authentication['local-users'][user]['download']}}/{{authentication['local-users'][user]['upload']}} {% else %} {{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}} {% endif %} {% endif %} {% endfor %} ''' ### # 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.socket(socket.AF_INET, socket.SOCK_STREAM) while True: try: s.connect(("127.0.0.1", 2004)) break except ConnectionRefusedError: time.sleep(0.5) cnt +=1 if cnt == 100: raise("failed to start l2tp server") break ### chap_secrets file if auth mode local def write_chap_secrets(c): tmpl = jinja2.Template(chap_secrets_conf, trim_blocks=True) chap_secrets_txt = tmpl.render(c) old_umask = os.umask(0o077) open(chap_secrets,'w').write(chap_secrets_txt) os.umask(old_umask) sl.syslog(sl.LOG_NOTICE, chap_secrets + ' written') def accel_cmd(cmd=''): if not cmd: return None try: ret = subprocess.check_output(['/usr/bin/accel-cmd','-p','2004',cmd]).decode().strip() return ret except: return 1 ### # inline helper functions end ### def get_config(): c = Config() if not c.exists('vpn l2tp remote-access '): return None c.set_level('vpn l2tp remote-access') config_data = { 'authentication' : { 'mode' : 'local', 'local-users' : { }, 'radiussrv' : {}, 'radiusopt' : {}, 'auth_proto' : [], 'mppe' : 'prefer' }, 'outside_addr' : '', 'outside_nexthop' : '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' : {}, } ### 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('outside-nexthop'): config_data['outside_nexthop'] = c.return_value('outside-nexthop') else: ### calculate gw-ip-address if c.exists('client-ip-pool start'): ### use start ip as gw-ip-address config_data['outside_nexthop'] = 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['outside_nexthop'] = 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") if not c['outside_nexthop']: #raise ConfigError('set vpn l2tp remote-access outside-nexthop required') print ("WARMING: set vpn l2tp remote-access outside-nexthop required") ## 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 ### 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 = jinja2.Template(l2tp_config, trim_blocks=True) config_text = tmpl.render(c) open(l2tp_conf,'w').write(config_text) if c['authentication']['local-users']: write_chap_secrets(c) 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 = subprocess.call(['/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') sl.syslog(sl.LOG_NOTICE, "reloading config via daemon restart") if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) sys.exit(1)