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Diffstat (limited to 'src/conf_mode/vpn_l2tp.py')
-rwxr-xr-xsrc/conf_mode/vpn_l2tp.py386
1 files changed, 386 insertions, 0 deletions
diff --git a/src/conf_mode/vpn_l2tp.py b/src/conf_mode/vpn_l2tp.py
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+++ b/src/conf_mode/vpn_l2tp.py
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+#!/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 vyos.config import Config
+from vyos.util import call
+from vyos.validate import is_ipv4
+from vyos import ConfigError
+from vyos.template import render
+
+
+l2tp_conf = '/run/accel-pppd/l2tp.conf'
+l2tp_chap_secrets = '/run/accel-pppd/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
+
+ dirname = os.path.dirname(l2tp_conf)
+ if not os.path.exists(dirname):
+ os.mkdir(dirname)
+
+ render(l2tp_conf, 'l2tp/l2tp.config.tmpl', c, trim_blocks=True)
+
+ if l2tp['auth_mode'] == 'local':
+ render(l2tp_chap_secrets, 'l2tp/chap-secrets.tmpl', l2tp)
+ 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)