summaryrefslogtreecommitdiff
path: root/src/conf_mode/vpn_sstp.py
blob: 8bafa0e6162c2710d2c9c9bb6b845b624cc52d22 (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
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
#!/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

from time import sleep
from sys import exit
from socket import socket, AF_INET, SOCK_STREAM
from copy import deepcopy
from stat import S_IRUSR, S_IWUSR, S_IRGRP
from jinja2 import FileSystemLoader, Environment

from vyos.config import Config
from vyos import ConfigError
from vyos.defaults import directories as vyos_data_dir
from vyos.util import process_running
from vyos.util import process_running, cmd, run

pidfile = r'/var/run/accel_sstp.pid'
sstp_cnf_dir = r'/etc/accel-ppp/sstp'
chap_secrets = sstp_cnf_dir + '/chap-secrets'
sstp_conf = sstp_cnf_dir + '/sstp.config'

# config path creation
if not os.path.exists(sstp_cnf_dir):
    os.makedirs(sstp_cnf_dir)

def chk_con():
    cnt = 0
    s = socket(AF_INET, SOCK_STREAM)
    while True:
        try:
            s.connect(("127.0.0.1", 2005))
            s.close()
            break
        except ConnectionRefusedError:
            sleep(0.5)
            cnt += 1
            if cnt == 100:
                raise("failed to start sstp server")
                break


def _accel_cmd(command):
    return run(f'/usr/bin/accel-cmd -p 2005 {command}')

default_config_data = {
    'local_users' : [],
    'auth_mode' : 'local',
    'auth_proto' : [],
    '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' : '',
    'ssl_ca' : '',
    'ssl_cert' : '',
    'ssl_key' : '',
    'client_ip_pool' : [],
    'dnsv4' : [],
    'mtu' : '',
    'ppp_mppe' : '',
    'ppp_echo_failure' : '',
    'ppp_echo_interval' : '',
    'ppp_echo_timeout' : '',
    'thread_cnt' : 1
}

def get_config():
    sstp = deepcopy(default_config_data)
    base_path = ['vpn', 'sstp']
    conf = Config()
    if not conf.exists(base_path):
        return None

    conf.set_level(base_path)

    cpu = os.cpu_count()
    if cpu > 1:
        sstp['thread_cnt'] = int(cpu/2)

    if conf.exists(['authentication', 'mode']):
        sstp['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' : '*',
                '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'])

            sstp['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']):
                sstp['radius_server'].append(radius)

        #
        # advanced radius-setting
        conf.set_level(base_path + ['authentication', 'radius'])

        if conf.exists(['acct-timeout']):
            sstp['radius_acct_tmo'] = conf.return_value(['acct-timeout'])

        if conf.exists(['max-try']):
            sstp['radius_max_try'] = conf.return_value(['max-try'])

        if conf.exists(['timeout']):
            sstp['radius_timeout'] = conf.return_value(['timeout'])

        if conf.exists(['nas-identifier']):
            sstp['radius_nas_id'] = conf.return_value(['nas-identifier'])

        if conf.exists(['nas-ip-address']):
            sstp['radius_nas_ip'] = conf.return_value(['nas-ip-address'])

        if conf.exists(['source-address']):
            sstp['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'])

            sstp['radius_dynamic_author'] = dae

        if conf.exists(['rate-limit', 'enable']):
            sstp['radius_shaper_attr'] = 'Filter-Id'
            c_attr = ['rate-limit', 'enable', 'attribute']
            if conf.exists(c_attr):
                sstp['radius_shaper_attr'] = conf.return_value(c_attr)

            c_vendor = ['rate-limit', 'enable', 'vendor']
            if conf.exists(c_vendor):
                sstp['radius_shaper_vendor'] = conf.return_value(c_vendor)

    #
    # authentication protocols
    conf.set_level(base_path + ['authentication'])
    if conf.exists(['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(['protocols']):
            sstp['auth_proto'].append(auth_mods[proto])

    else:
        sstp['auth_proto'] = ['auth_mschap_v2']

    #
    # read in SSL certs
    conf.set_level(base_path + ['ssl'])
    if conf.exists(['ca-cert-file']):
        sstp['ssl_ca'] = conf.return_value(['ca-cert-file'])

    if conf.exists(['cert-file']):
        sstp['ssl_cert'] = conf.return_value(['cert-file'])

    if conf.exists(['key-file']):
        sstp['ssl_key'] = conf.return_value(['key-file'])


    #
    # read in client ip pool settings
    conf.set_level(base_path + ['network-settings', 'client-ip-settings'])
    if conf.exists(['subnet']):
        sstp['client_ip_pool'] = conf.return_values(['subnet'])

    if conf.exists(['gateway-address']):
        sstp['client_gateway'] = conf.return_value(['gateway-address'])

    #
    # read in network settings
    conf.set_level(base_path + ['network-settings'])
    if conf.exists(['name-server']):
        sstp['dnsv4'] = conf.return_values(['name-server'])

    if conf.exists(['mtu']):
        sstp['mtu'] = conf.return_value(['mtu'])

    #
    # read in PPP stuff
    conf.set_level(base_path + ['ppp-settings'])
    if conf.exists('mppe'):
        sstp['ppp_mppe'] = conf.return_value('ppp-settings mppe')

    if conf.exists(['lcp-echo-failure']):
        sstp['ppp_echo_failure'] = conf.return_value(['lcp-echo-failure'])

    if conf.exists(['lcp-echo-interval']):
        sstp['ppp_echo_interval'] = conf.return_value(['lcp-echo-interval'])

    if conf.exists(['lcp-echo-timeout']):
        sstp['ppp_echo_timeout'] = conf.return_value(['lcp-echo-timeout'])

    return sstp


def verify(sstp):
    if sstp is None:
        return None

    # vertify auth settings
    if sstp['auth_mode'] == 'local':
        if not sstp['local_users']:
            raise ConfigError('sstp-server authentication local-users required')

        for user in sstp['local_users']:
            if not user['password']:
                raise ConfigError(f"Password required for user {user['name']}")

            # if up/download is set, check that both have a value
            if user['upload'] and not user['download']:
                raise ConfigError(f"Download speed value required for user {user['name']}")

            if user['download'] and not user['upload']:
                raise ConfigError(f"Upload speed value required for user {user['name']}")

        if not sstp['client_ip_pool']:
            raise ConfigError("Client IP subnet required")

        if not sstp['client_gateway']:
            raise ConfigError("Client gateway IP address required")

    if len(sstp['dnsv4']) > 2:
        raise ConfigError('Not more then two IPv4 DNS name-servers can be configured')

    if not sstp['ssl_ca'] or not sstp['ssl_cert'] or not sstp['ssl_key']:
        raise ConfigError('One or more SSL certificates missing')

    if not os.path.exists(sstp['ssl_ca']):
        raise ConfigError(f"CA cert file {sstp['ssl_ca']} does not exist")

    if not os.path.exists(sstp['ssl_cert']):
        raise ConfigError(f"SSL cert file {sstp['ssl_cert']} does not exist")

    if not os.path.exists(sstp['ssl_key']):
        raise ConfigError(f"SSL key file {sstp['ssl_key']} does not exist")

    if sstp['auth_mode'] == 'radius':
        if len(sstp['radius_server']) == 0:
            raise ConfigError("RADIUS authentication requires at least one server")

        for radius in sstp['radius_server']:
            if not radius['key']:
                raise ConfigError(f"Missing RADIUS secret for server {{ radius['key'] }}")

def generate(sstp):
    if sstp is None:
        return None

    # Prepare Jinja2 template loader from files
    tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'sstp')
    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
    tmpl = env.get_template('sstp.config.tmpl')
    config_text = tmpl.render(sstp)
    with open(sstp_conf, 'w') as f:
        f.write(config_text)

    if sstp['local_users']:
        tmpl = env.get_template('chap-secrets.tmpl')
        config_text = tmpl.render(sstp)
        with open(chap_secrets, 'w') as f:
            f.write(config_text)

        os.chmod(chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP)
    else:
        if os.path.exists(chap_secrets):
             os.unlink(chap_secrets)

    return sstp

def apply(sstp):
    if sstp is None:
        if process_running(pidfile):
            command = 'start-stop-daemon'
            command += ' --stop '
            command += ' --quiet'
            command += ' --oknodo'
            command += ' --pidfile ' + pidfile
            cmd(command)

        if os.path.exists(pidfile):
            os.remove(pidfile)

        return None

    if not process_running(pidfile):
        if os.path.exists(pidfile):
            os.remove(pidfile)

        command = 'start-stop-daemon'
        command += ' --start '
        command += ' --quiet'
        command += ' --oknodo'
        command += ' --pidfile ' + pidfile
        command += ' --exec /usr/sbin/accel-pppd'
        # now pass arguments to accel-pppd binary
        command += ' --'
        command += ' -c ' + sstp_conf
        command += ' -p ' + pidfile
        command += ' -d'
        cmd(command)

        chk_con()

    else:
        _accel_cmd('restart')


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