summaryrefslogtreecommitdiff
path: root/src/conf_mode/accel_pptp.py
blob: 257c2f18e7ff532f193033ea39a3abf90050eeeb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
#!/usr/bin/env python3
#
# Copyright (C) 2018 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 sys
import os
import re
import subprocess
import jinja2
import socket
import time
import syslog as sl

from vyos.config import Config
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'
# accel-pppd -d -c /etc/accel-ppp/pppoe/pppoe.config -p /var/run/accel_pppoe.pid

### config path creation
if not os.path.exists(pptp_cnf_dir):
  os.makedirs(pptp_cnf_dir)
  sl.syslog(sl.LOG_NOTICE, pptp_cnf_dir  + " created")

pptp_config = '''
### generated by accel_pptp.py ###
[modules]
log_syslog
pptp
ippool
chap-secrets
{% if authentication['auth_proto'] %}
{{ authentication['auth_proto'] }}
{% else %}
auth_mschap_v2
{% endif %}
{% if authentication['mode'] == 'radius' %}
radius
{% endif -%}

[core]
thread-count={{thread_cnt}}

[log]
syslog=accel-pptp,daemon
copy=1
level=5

{% if dns %}
[dns]
{% if dns[0] %}
dns1={{dns[0]}}
{% endif %}
{% if dns[1] %}
dns2={{dns[1]}}
{% endif %}
{% endif %}

{% if wins %}
[wins]
{% if wins[0] %}
wins1={{wins[0]}}
{% endif %}
{% if wins[1] %}
wins2={{wins[1]}}
{% endif %}
{% endif %}

[pptp]
bind={{outside_addr}}
verbose=5
ppp-max-mtu={{mtu}}

[client-ip-range]
0.0.0.0/0

[ip-pool]
tunnel={{client_ip_pool}}
gw-ip-address={{gw_ip}}

{% if authentication['mode'] == 'local' %}
[chap-secrets]
chap-secrets=/etc/accel-ppp/pptp/chap-secrets
{% endif %}

[ppp]
verbose=5
check-ip=1
single-session=replace

{% if authentication['mode'] == 'radius' %}
[radius]
{% for rsrv in authentication['radiussrv']: %}
server={{rsrv}},{{authentication['radiussrv'][rsrv]['secret']}},\
req-limit={{authentication['radiussrv'][rsrv]['req-limit']}},\
fail-time={{authentication['radiussrv'][rsrv]['fail-time']}}
{% endfor %}
timeout=30
acct-timeout=30
max-try=3
{%endif %}

[cli]
tcp=127.0.0.1:2003
'''

### pptp chap secrets
chap_secrets_conf = '''
# username  server  password  acceptable local IP addresses
{% for user in authentication['local-users'] %}
{% if authentication['local-users'][user]['state'] == 'enabled' %}
{{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}}
{% endif %}
{% endfor %}
'''
###
# inline helper functions
###
# depending on hw and threads, daemon needs a little to start
# if it takes longer than 100 * 0.5 secs, exception is being raised
# not sure if that's the best way to check it, but it worked so far quite well 
###
def chk_con():
  cnt = 0
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  while True:
    try:
      s.connect(("127.0.0.1", 2003))
      break
    except ConnectionRefusedError:
      time.sleep(0.5)
      cnt +=1
      if cnt == 100:
        raise("failed to start pptp server")
        break

### chap_secrets file if auth mode local
def write_chap_secrets(c):
  tmpl = jinja2.Template(chap_secrets_conf, trim_blocks=True)
  chap_secrets_txt = tmpl.render(c)
  old_umask = os.umask(0o077)
  open(chap_secrets,'w').write(chap_secrets_txt)
  os.umask(old_umask)
  sl.syslog(sl.LOG_NOTICE, chap_secrets + ' written')

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' 
    },
    '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 c.return_value('authentication radius server ' + rsrv + ' fail-time') == None:
        ftime = '0'
      else:
        ftime = str(c.return_value('authentication radius server ' + rsrv + ' fail-time'))
      if c.return_value('authentication radius-server ' + rsrv + ' req-limit') == None:
        reql = '0'
      else:
        reql = str(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'
  
  return config_data

def verify(c):
  if c == None:
    return None

  if c['authentication']['mode'] == 'local':
    if not c['authentication']['local-users']:
      raise ConfigError('pppoe-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
  
  ### 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 = jinja2.Template(pptp_config, trim_blocks=True)
  config_text = tmpl.render(c)
  open(pptp_conf,'w').write(config_text)

  if c['authentication']['local-users']:
    write_chap_secrets(c)

  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')
    sl.syslog(sl.LOG_NOTICE, "reloading config via daemon restart")

if __name__ == '__main__':
  try:
    c = get_config()
    verify(c)
    generate(c)
    apply(c)
  except ConfigError as e:
    print(e)
    sys.exit(1)