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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
import subprocess
from jinja2 import FileSystemLoader, Environment
from socket import socket, AF_INET, SOCK_STREAM
from sys import exit
from time import sleep
from vyos.config import Config
from vyos.defaults import directories as vyos_data_dir
from vyos import ConfigError
pidfile = r'/var/run/accel_pptp.pid'
pptp_cnf_dir = r'/etc/accel-ppp/pptp'
chap_secrets = pptp_cnf_dir + '/chap-secrets'
pptp_conf = pptp_cnf_dir + '/pptp.config'
# config path creation
if not os.path.exists(pptp_cnf_dir):
os.makedirs(pptp_cnf_dir)
def _chk_con():
cnt = 0
s = socket(AF_INET, SOCK_STREAM)
while True:
try:
s.connect(("127.0.0.1", 2003))
break
except ConnectionRefusedError:
sleep(0.5)
cnt += 1
if cnt == 100:
raise("failed to start pptp server")
break
# chap_secrets file if auth mode local
def _accel_cmd(cmd=''):
if not cmd:
return None
try:
ret = subprocess.check_output(
['/usr/bin/accel-cmd', '-p', '2003', cmd]).decode().strip()
return ret
except:
return 1
###
# inline helper functions end
###
def get_config():
c = Config()
if not c.exists(['vpn', 'pptp', 'remote-access']):
return None
c.set_level(['vpn', 'pptp', 'remote-access'])
config_data = {
'authentication': {
'mode': 'local',
'local-users': {
},
'radiussrv': {},
'auth_proto': 'auth_mschap_v2',
'mppe': 'require'
},
'outside_addr': '',
'dns': [],
'wins': [],
'client_ip_pool': '',
'mtu': '1436',
}
### 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(['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': ''
}
}
)
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'])
# 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 not c.return_value(['authentication', 'radius', 'server', rsrv, 'fail-time']):
ftime = '0'
else:
ftime = c.return_value(
['authentication', 'radius', 'server', rsrv, 'fail-time'])
if not c.return_value(['authentication', 'radius-server', rsrv, 'req-limit']):
reql = '0'
else:
reql = 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
}
}
)
if c.exists(['client-ip-pool']):
if c.exists(['client-ip-pool', 'start']):
config_data['client_ip_pool'] = c.return_value(
['client-ip-pool', 'start'])
if c.exists(['client-ip-pool', 'stop']):
config_data['client_ip_pool'] += '-' + \
re.search(
'[0-9]+$', c.return_value(['client-ip-pool', 'stop'])).group(0)
if c.exists(['mtu']):
config_data['mtu'] = c.return_value(['mtu'])
# gateway address
if c.exists(['gateway-address']):
config_data['gw_ip'] = c.return_value(['gateway-address'])
else:
config_data['gw_ip'] = re.sub(
'[0-9]+$', '1', config_data['client_ip_pool'])
if c.exists(['authentication', 'require']):
if c.return_value(['authentication', 'require']) == 'pap':
config_data['authentication']['auth_proto'] = 'auth_pap'
if c.return_value(['authentication', 'require']) == 'chap':
config_data['authentication']['auth_proto'] = 'auth_chap_md5'
if c.return_value(['authentication', 'require']) == 'mschap':
config_data['authentication']['auth_proto'] = 'auth_mschap_v1'
if c.return_value(['authentication', 'require']) == 'mschap-v2':
config_data['authentication']['auth_proto'] = 'auth_mschap_v2'
if c.exists(['authentication', 'mppe']):
config_data['authentication']['mppe'] = c.return_value(
['authentication', 'mppe'])
return config_data
def verify(c):
if c == None:
return None
if c['authentication']['mode'] == 'local':
if not c['authentication']['local-users']:
raise ConfigError(
'pptp-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')
def generate(c):
if c == None:
return None
# Prepare Jinja2 template loader from files
tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'pptp')
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('pptp.config.tmpl')
config_text = tmpl.render(c)
with open(pptp_conf, 'w') as f:
f.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)
with open(chap_secrets, 'w') as f:
f.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 = subprocess.call(
['/usr/sbin/accel-pppd', '-c', pptp_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)
exit(1)
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