diff options
Diffstat (limited to 'src/conf_mode/vpn_l2tp.py')
| -rwxr-xr-x | src/conf_mode/vpn_l2tp.py | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/src/conf_mode/vpn_l2tp.py b/src/conf_mode/vpn_l2tp.py new file mode 100755 index 000000000..4ca5a858a --- /dev/null +++ b/src/conf_mode/vpn_l2tp.py @@ -0,0 +1,397 @@ +#!/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 <http://www.gnu.org/licenses/>. + +import sys +import os +import re +import jinja2 +import socket +import time + +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) + +### +# 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 + + +def _accel_cmd(command): + return run(f'/usr/bin/accel-cmd -p 2004 {command}') + +### +# 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': '', + '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': {}, + } + + ### 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) + sys.exit(1) |