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diff --git a/src/conf_mode/vpn_l2tp.py b/src/conf_mode/vpn_l2tp.py
index febe8c3b7..7e40be32a 100755
--- a/src/conf_mode/vpn_l2tp.py
+++ b/src/conf_mode/vpn_l2tp.py
@@ -1,377 +1,377 @@
#!/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, get_half_cpus
from vyos.validate import is_ipv4
from vyos import ConfigError
from vyos.template import render
from vyos import airbag
airbag.enable()
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': get_half_cpus()
}
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)
### 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, 'delegation-prefix']):
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
+ 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
render(l2tp_conf, 'accel-ppp/l2tp.config.tmpl', l2tp, trim_blocks=True)
if l2tp['auth_mode'] == 'local':
render(l2tp_chap_secrets, 'accel-ppp/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')
for file in [l2tp_chap_secrets, l2tp_conf]:
if os.path.exists(file):
os.unlink(file)
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)

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