diff options
Diffstat (limited to 'src/conf_mode/vpn_l2tp.py')
| -rwxr-xr-x | src/conf_mode/vpn_l2tp.py | 398 |
1 files changed, 398 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..7ecd8b2a4 --- /dev/null +++ b/src/conf_mode/vpn_l2tp.py @@ -0,0 +1,398 @@ +#!/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 os +import re + +from copy import deepcopy +from stat import S_IRUSR, S_IWUSR, S_IRGRP +from sys import exit +from time import sleep + +from ipaddress import ip_network +from jinja2 import FileSystemLoader, Environment + +from vyos.config import Config +from vyos.defaults import directories as vyos_data_dir +from vyos.util import call +from vyos.validate import is_ipv4 +from vyos import ConfigError + +l2tp_conf = '/etc/accel-ppp/l2tp.conf' +l2tp_chap_secrets = '/etc/accel-ppp/l2tp.chap-secrets' + +default_config_data = { + 'auth_mode': 'local', + 'auth_ppp_mppe': 'prefer', + 'auth_proto': ['auth_mschap_v2'], + 'chap_secrets_file': l2tp_chap_secrets, # used in Jinja2 template + 'client_ip_pool': None, + 'client_ip_subnets': [], + 'client_ipv6_pool': [], + 'client_ipv6_delegate_prefix': [], + 'dnsv4': [], + 'dnsv6': [], + 'gateway_address': '10.255.255.0', + 'local_users' : [], + 'mtu': '1436', + 'outside_addr': '', + 'ppp_mppe': 'prefer', + 'ppp_echo_failure' : '3', + 'ppp_echo_interval' : '30', + 'ppp_echo_timeout': '0', + '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': '', + 'wins': [], + 'ip6_column': [], + 'thread_cnt': 1 +} + +def get_config(): + conf = Config() + base_path = ['vpn', 'l2tp', 'remote-access'] + if not conf.exists(base_path): + return None + + conf.set_level(base_path) + l2tp = deepcopy(default_config_data) + + cpu = os.cpu_count() + if cpu > 1: + l2tp['thread_cnt'] = int(cpu/2) + + ### general options ### + if conf.exists(['name-server']): + for name_server in conf.return_values(['name-server']): + if is_ipv4(name_server): + l2tp['dnsv4'].append(name_server) + else: + l2tp['dnsv6'].append(name_server) + + if conf.exists(['wins-server']): + l2tp['wins'] = conf.return_values(['wins-server']) + + if conf.exists('outside-address'): + l2tp['outside_addr'] = conf.return_value('outside-address') + + if conf.exists(['authentication', 'mode']): + l2tp['auth_mode'] = conf.return_value(['authentication', 'mode']) + + if conf.exists(['authentication', 'protocols']): + 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', 'protocols']): + l2tp['auth_proto'].append(auth_mods[proto]) + + if conf.exists(['authentication', 'mppe']): + l2tp['auth_ppp_mppe'] = conf.return_value(['authentication', 'mppe']) + + # + # 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']) + + l2tp['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']): + l2tp['radius_server'].append(radius) + + # + # advanced radius-setting + conf.set_level(base_path + ['authentication', 'radius']) + + if conf.exists(['acct-timeout']): + l2tp['radius_acct_tmo'] = conf.return_value(['acct-timeout']) + + if conf.exists(['max-try']): + l2tp['radius_max_try'] = conf.return_value(['max-try']) + + if conf.exists(['timeout']): + l2tp['radius_timeout'] = conf.return_value(['timeout']) + + if conf.exists(['nas-identifier']): + l2tp['radius_nas_id'] = conf.return_value(['nas-identifier']) + + if conf.exists(['nas-ip-address']): + l2tp['radius_nas_ip'] = conf.return_value(['nas-ip-address']) + + if conf.exists(['source-address']): + l2tp['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']) + + l2tp['radius_dynamic_author'] = dae + + if conf.exists(['rate-limit', 'enable']): + l2tp['radius_shaper_attr'] = 'Filter-Id' + c_attr = ['rate-limit', 'enable', 'attribute'] + if conf.exists(c_attr): + l2tp['radius_shaper_attr'] = conf.return_value(c_attr) + + c_vendor = ['rate-limit', 'enable', 'vendor'] + if conf.exists(c_vendor): + l2tp['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']) + l2tp['client_ip_pool'] = start + '-' + re.search('[0-9]+$', stop).group(0) + + if conf.exists(['client-ip-pool', 'subnet']): + l2tp['client_ip_subnets'] = conf.return_values(['client-ip-pool', 'subnet']) + + if conf.exists(['client-ipv6-pool', 'prefix']): + l2tp['ip6_column'].append('ip6') + for prefix in conf.list_nodes(['client-ipv6-pool', 'prefix']): + tmp = { + 'prefix': prefix, + 'mask': '64' + } + + if conf.exists(['client-ipv6-pool', 'prefix', prefix, 'mask']): + tmp['mask'] = conf.return_value(['client-ipv6-pool', 'prefix', prefix, 'mask']) + + l2tp['client_ipv6_pool'].append(tmp) + + if conf.exists(['client-ipv6-pool', 'delegate']): + l2tp['ip6_column'].append('ip6-db') + for prefix in conf.list_nodes(['client-ipv6-pool', 'delegate']): + tmp = { + 'prefix': prefix, + 'mask': '' + } + + if conf.exists(['client-ipv6-pool', 'delegate', prefix, 'mask']): + tmp['mask'] = conf.return_value(['client-ipv6-pool', 'delegate', prefix, 'delegation-prefix']) + + l2tp['client_ipv6_delegate_prefix'].append(tmp) + + if conf.exists(['mtu']): + l2tp['mtu'] = conf.return_value(['mtu']) + + # gateway address + if conf.exists(['gateway-address']): + l2tp['gateway_address'] = conf.return_value(['gateway-address']) + else: + # calculate gw-ip-address + if conf.exists(['client-ip-pool', 'start']): + # use start ip as gw-ip-address + l2tp['gateway_address'] = conf.return_value(['client-ip-pool', 'start']) + + elif conf.exists(['client-ip-pool', 'subnet']): + # use first ip address from first defined pool + subnet = conf.return_values(['client-ip-pool', 'subnet'])[0] + subnet = ip_network(subnet) + l2tp['gateway_address'] = str(list(subnet.hosts())[0]) + + # LNS secret + if conf.exists(['lns', 'shared-secret']): + l2tp['lns_shared_secret'] = conf.return_value(['lns', 'shared-secret']) + + if conf.exists(['ccp-disable']): + l2tp[['ccp_disable']] = True + + # PPP options + if conf.exists(['idle']): + l2tp['ppp_echo_timeout'] = conf.return_value(['idle']) + + if conf.exists(['ppp-options', 'lcp-echo-failure']): + l2tp['ppp_echo_failure'] = conf.return_value(['ppp-options', 'lcp-echo-failure']) + + if conf.exists(['ppp-options', 'lcp-echo-interval']): + l2tp['ppp_echo_interval'] = conf.return_value(['ppp-options', 'lcp-echo-interval']) + + return l2tp + + +def verify(l2tp): + if not l2tp: + return None + + if l2tp['auth_mode'] == 'local': + if not l2tp['local_users']: + raise ConfigError('L2TP local auth mode requires local users to be configured!') + + for user in l2tp['local_users']: + if not user['password']: + raise ConfigError(f"Password required for user {user['name']}") + + elif l2tp['auth_mode'] == 'radius': + if len(l2tp['radius_server']) == 0: + raise ConfigError("RADIUS authentication requires at least one server") + + for radius in l2tp['radius_server']: + if not radius['key']: + raise ConfigError(f"Missing RADIUS secret for server {{ radius['key'] }}") + + # check for the existence of a client ip pool + if not (l2tp['client_ip_pool'] or l2tp['client_ip_subnets']): + raise ConfigError( + "set vpn l2tp remote-access client-ip-pool requires subnet or start/stop IP pool") + + # check ipv6 + if l2tp['client_ipv6_delegate_prefix'] and not l2tp['client_ipv6_pool']: + raise ConfigError('IPv6 prefix delegation requires client-ipv6-pool prefix') + + for prefix in l2tp['client_ipv6_delegate_prefix']: + if not prefix['mask']: + raise ConfigError('Delegation-prefix required for individual delegated networks') + + if len(l2tp['wins']) > 2: + raise ConfigError('Not more then two IPv4 WINS name-servers can be configured') + + if len(l2tp['dnsv4']) > 2: + raise ConfigError('Not more then two IPv4 DNS name-servers can be configured') + + if len(l2tp['dnsv6']) > 3: + raise ConfigError('Not more then three IPv6 DNS name-servers can be configured') + + return None + + +def generate(l2tp): + if not l2tp: + 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) + + dirname = os.path.dirname(l2tp_conf) + if not os.path.exists(dirname): + os.mkdir(dirname) + + tmpl = env.get_template('l2tp.config.tmpl') + config_text = tmpl.render(c) + with open(l2tp_conf, 'w') as f: + f.write(config_text) + + if l2tp['auth_mode'] == 'local': + tmpl = env.get_template('chap-secrets.tmpl') + config_text = tmpl.render(l2tp) + with open(l2tp_chap_secrets, 'w') as f: + f.write(config_text) + + os.chmod(l2tp_chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP) + + else: + if os.path.exists(l2tp_chap_secrets): + os.unlink(l2tp_chap_secrets) + + return None + + +def apply(l2tp): + if not l2tp: + call('systemctl stop accel-ppp-l2tp.service') + + if os.path.exists(l2tp_conf): + os.unlink(l2tp_conf) + + if os.path.exists(l2tp_chap_secrets): + os.unlink(l2tp_chap_secrets) + + return None + + call('systemctl restart accel-ppp-l2tp.service') + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) |