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vpn_pptp.py
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vpn_pptp.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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 vyos.config import Config
from vyos.template import render
from vyos.util import call, get_half_cpus
from vyos import ConfigError
from vyos import airbag
airbag.enable()
pptp_conf = '/run/accel-pppd/pptp.conf'
pptp_chap_secrets = '/run/accel-pppd/pptp.chap-secrets'
default_pptp = {
'auth_mode' : 'local',
'local_users' : [],
'radius_server' : [],
'radius_acct_tmo' : '30',
'radius_max_try' : '3',
'radius_timeout' : '30',
'radius_nas_id' : '',
'radius_nas_ip' : '',
'radius_source_address' : '',
'radius_shaper_attr' : '',
'radius_shaper_vendor': '',
'radius_dynamic_author' : '',
'chap_secrets_file': pptp_chap_secrets, # used in Jinja2 template
'outside_addr': '',
'dnsv4': [],
'wins': [],
'client_ip_pool': '',
'mtu': '1436',
'auth_proto' : ['auth_mschap_v2'],
'ppp_mppe' : 'prefer',
'thread_cnt': get_half_cpus()
}
def get_config():
conf = Config()
base_path = ['vpn', 'pptp', 'remote-access']
if not conf.exists(base_path):
return None
pptp = deepcopy(default_pptp)
conf.set_level(base_path)
if conf.exists(['name-server']):
pptp['dnsv4'] = conf.return_values(['name-server'])
if conf.exists(['wins-server']):
pptp['wins'] = conf.return_values(['wins-server'])
if conf.exists(['outside-address']):
pptp['outside_addr'] = conf.return_value(['outside-address'])
if conf.exists(['authentication', 'mode']):
pptp['auth_mode'] = conf.return_value(['authentication', 'mode'])
#
# 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' : '*',
}
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 not conf.exists(['disable']):
pptp['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',
'acct_port' : '1813'
}
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(['acct-port']):
radius['acct_port'] = conf.return_value(['acct-port'])
if conf.exists(['key']):
radius['key'] = conf.return_value(['key'])
if not conf.exists(['disable']):
pptp['radius_server'].append(radius)
#
# advanced radius-setting
conf.set_level(base_path + ['authentication', 'radius'])
if conf.exists(['acct-timeout']):
pptp['radius_acct_tmo'] = conf.return_value(['acct-timeout'])
if conf.exists(['max-try']):
pptp['radius_max_try'] = conf.return_value(['max-try'])
if conf.exists(['timeout']):
pptp['radius_timeout'] = conf.return_value(['timeout'])
if conf.exists(['nas-identifier']):
pptp['radius_nas_id'] = conf.return_value(['nas-identifier'])
if conf.exists(['nas-ip-address']):
pptp['radius_nas_ip'] = conf.return_value(['nas-ip-address'])
if conf.exists(['source-address']):
pptp['radius_source_address'] = conf.return_value(['source-address'])
# Dynamic Authorization Extensions (DOA)/Change Of Authentication (COA)
if conf.exists(['dae-server']):
dae = {
'port' : '',
'server' : '',
'key' : ''
}
if conf.exists(['dynamic-author', 'ip-address']):
dae['server'] = conf.return_value(['dynamic-author', 'ip-address'])
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'])
pptp['radius_dynamic_author'] = dae
if conf.exists(['rate-limit', 'enable']):
pptp['radius_shaper_attr'] = 'Filter-Id'
c_attr = ['rate-limit', 'enable', 'attribute']
if conf.exists(c_attr):
pptp['radius_shaper_attr'] = conf.return_value(c_attr)
c_vendor = ['rate-limit', 'enable', 'vendor']
if conf.exists(c_vendor):
pptp['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'])
pptp['client_ip_pool'] = start + '-' + re.search('[0-9]+$', stop).group(0)
if conf.exists(['mtu']):
pptp['mtu'] = conf.return_value(['mtu'])
# gateway address
if conf.exists(['gateway-address']):
pptp['gw_ip'] = conf.return_value(['gateway-address'])
else:
# calculate gw-ip-address
if conf.exists(['client-ip-pool', 'start']):
# use start ip as gw-ip-address
pptp['gateway_address'] = conf.return_value(['client-ip-pool', 'start'])
if conf.exists(['authentication', 'require']):
# clear default list content, now populate with actual CLI values
pptp['auth_proto'] = []
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', 'require']):
pptp['auth_proto'].append(auth_mods[proto])
if conf.exists(['authentication', 'mppe']):
pptp['ppp_mppe'] = conf.return_value(['authentication', 'mppe'])
return pptp
def verify(pptp):
if not pptp:
return None
if pptp['auth_mode'] == 'local':
if not pptp['local_users']:
raise ConfigError('PPTP local auth mode requires local users to be configured!')
for user in pptp['local_users']:
username = user['name']
if not user['password']:
raise ConfigError(f'Password required for local user "{username}"')
elif pptp['auth_mode'] == 'radius':
if len(pptp['radius_server']) == 0:
raise ConfigError('RADIUS authentication requires at least one server')
for radius in pptp['radius_server']:
if not radius['key']:
server = radius['server']
raise ConfigError(f'Missing RADIUS secret key for server "{ server }"')
if len(pptp['dnsv4']) > 2:
raise ConfigError('Not more then two IPv4 DNS name-servers can be configured')
if len(pptp['wins']) > 2:
raise ConfigError('Not more then two IPv4 WINS name-servers can be configured')
def generate(pptp):
if not pptp:
return None
render(pptp_conf, 'accel-ppp/pptp.config.tmpl', pptp, trim_blocks=True)
if pptp['local_users']:
render(pptp_chap_secrets, 'accel-ppp/chap-secrets.tmpl', pptp, trim_blocks=True)
os.chmod(pptp_chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP)
else:
if os.path.exists(pptp_chap_secrets):
os.unlink(pptp_chap_secrets)
def apply(pptp):
if not pptp:
call('systemctl stop accel-ppp@pptp.service')
for file in [pptp_conf, pptp_chap_secrets]:
if os.path.exists(file):
os.unlink(file)
return None
call('systemctl restart accel-ppp@pptp.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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