summaryrefslogtreecommitdiff
path: root/src/conf_mode/vpn_ipsec.py
blob: 535e633ed4c2bb214c1537e7f581be3612b7a0f2 (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
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
#!/usr/bin/env python3
#
# Copyright (C) 2021 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 sys import exit
from time import sleep

from vyos.config import Config
from vyos.configdict import leaf_node_changed
from vyos.configverify import verify_interface_exists
from vyos.ifconfig import Interface
from vyos.template import ip_from_cidr
from vyos.template import render
from vyos.validate import is_ipv6_link_local
from vyos.util import call
from vyos.util import dict_search
from vyos.util import process_named_running
from vyos.util import run
from vyos.util import cidr_fit
from vyos import ConfigError
from vyos import airbag
airbag.enable()

authby_translate = {
    'pre-shared-secret': 'psk',
    'rsa': 'pubkey',
    'x509': 'pubkey'
}
default_pfs = 'dh-group2'
pfs_translate = {
    'dh-group1': 'modp768',
    'dh-group2': 'modp1024',
    'dh-group5': 'modp1536',
    'dh-group14': 'modp2048',
    'dh-group15': 'modp3072',
    'dh-group16': 'modp4096',
    'dh-group17': 'modp6144',
    'dh-group18': 'modp8192',
    'dh-group19': 'ecp256',
    'dh-group20': 'ecp384',
    'dh-group21': 'ecp512',
    'dh-group22': 'modp1024s160',
    'dh-group23': 'modp2048s224',
    'dh-group24': 'modp2048s256',
    'dh-group25': 'ecp192',
    'dh-group26': 'ecp224',
    'dh-group27': 'ecp224bp',
    'dh-group28': 'ecp256bp',
    'dh-group29': 'ecp384bp',
    'dh-group30': 'ecp512bp',
    'dh-group31': 'curve25519',
    'dh-group32': 'curve448'
}

any_log_modes = [
    'dmn', 'mgr', 'ike', 'chd','job', 'cfg', 'knl', 'net', 'asn',
    'enc', 'lib', 'esp', 'tls', 'tnc', 'imc', 'imv', 'pts'
]

ike_ciphers = {}
esp_ciphers = {}

dhcp_wait_attempts = 2
dhcp_wait_sleep = 1

mark_base = 0x900000

CERT_PATH="/etc/swanctl/x509/"
KEY_PATH="/etc/swanctl/private/"
CA_PATH = "/etc/swanctl/x509ca/"
CRL_PATH = "/etc/swanctl/x509crl/"

DHCP_BASE = "/var/lib/dhcp/dhclient"
DHCP_HOOK_IFLIST="/tmp/ipsec_dhcp_waiting"

LOCAL_KEY_PATHS = ['/config/auth/', '/config/ipsec.d/rsa-keys/']
X509_PATH = '/config/auth/'

def get_config(config=None):
    if config:
        conf = config
    else:
        conf = Config()
    base = ['vpn', 'ipsec']
    if not conf.exists(base):
        return None

    # retrieve common dictionary keys
    ipsec = conf.get_config_dict(base, key_mangling=('-', '_'),
                                 get_first_key=True, no_tag_node_value_mangle=True)

    ipsec['dhcp_no_address'] = {}
    ipsec['interface_change'] = leaf_node_changed(conf, base + ['ipsec-interfaces', 'interface'])
    ipsec['l2tp_exists'] = conf.exists('vpn l2tp remote-access ipsec-settings ')
    ipsec['nhrp_exists'] = conf.exists('protocols nhrp tunnel')
    ipsec['rsa_keys'] = conf.get_config_dict(['vpn', 'rsa-keys'], key_mangling=('-', '_'),
                                             get_first_key=True, no_tag_node_value_mangle=True)

    default_ike_pfs = None

    if 'ike_group' in ipsec:
        for group, ike_conf in ipsec['ike_group'].items():
            if 'proposal' in ike_conf:
                ciphers = []
                for i in ike_conf['proposal']:
                    proposal = ike_conf['proposal'][i]
                    enc = proposal['encryption'] if 'encryption' in proposal else None
                    hash = proposal['hash'] if 'hash' in proposal else None
                    pfs = ('dh-group' + proposal['dh_group']) if 'dh_group' in proposal else default_pfs

                    if not default_ike_pfs:
                        default_ike_pfs = pfs

                    if enc and hash:
                        ciphers.append(f"{enc}-{hash}-{pfs_translate[pfs]}" if pfs else f"{enc}-{hash}")
                ike_ciphers[group] = ','.join(ciphers)

    if 'esp_group' in ipsec:
        for group, esp_conf in ipsec['esp_group'].items():
            pfs = esp_conf['pfs'] if 'pfs' in esp_conf else 'enable'

            if pfs == 'disable':
                pfs = None

            if pfs == 'enable':
                pfs = default_ike_pfs

            if 'proposal' in esp_conf:
                ciphers = []
                for i in esp_conf['proposal']:
                    proposal = esp_conf['proposal'][i]
                    enc = proposal['encryption'] if 'encryption' in proposal else None
                    hash = proposal['hash'] if 'hash' in proposal else None
                    if enc and hash:
                        ciphers.append(f"{enc}-{hash}-{pfs_translate[pfs]}" if pfs else f"{enc}-{hash}")
                esp_ciphers[group] = ','.join(ciphers)

    return ipsec

def get_rsa_local_key(ipsec):
    return dict_search('local_key.file', ipsec['rsa_keys'])

def verify_rsa_local_key(ipsec):
    file = get_rsa_local_key(ipsec)

    if not file:
        return False

    for path in LOCAL_KEY_PATHS:
        full_path = os.path.join(path, file)
        if os.path.exists(full_path):
            return full_path

    return False

def verify_rsa_key(ipsec, key_name):
    return dict_search(f'rsa_key_name.{key_name}.rsa_key', ipsec['rsa_keys'])

def get_dhcp_address(iface):
    addresses = Interface(iface).get_addr()
    if not addresses:
        return None
    for address in addresses:
        if not is_ipv6_link_local(address):
            return ip_from_cidr(address)
    return None

def verify(ipsec):
    if not ipsec:
        return None

    if 'ipsec_interfaces' in ipsec and 'interface' in ipsec['ipsec_interfaces']:
        interfaces = ipsec['ipsec_interfaces']['interface']
        if isinstance(interfaces, str):
            interfaces = [interfaces]

        for ifname in interfaces:
            verify_interface_exists(ifname)

    if 'profile' in ipsec:
        for profile, profile_conf in ipsec['profile'].items():
            if 'esp_group' in profile_conf:
                if 'esp_group' not in ipsec or profile_conf['esp_group'] not in ipsec['esp_group']:
                    raise ConfigError(f"Invalid esp-group on {profile} profile")
            else:
                raise ConfigError(f"Missing esp-group on {profile} profile")

            if 'ike_group' in profile_conf:
                if 'ike_group' not in ipsec or profile_conf['ike_group'] not in ipsec['ike_group']:
                    raise ConfigError(f"Invalid ike-group on {profile} profile")
            else:
                raise ConfigError(f"Missing ike-group on {profile} profile")

            if 'authentication' not in profile_conf:
                raise ConfigError(f"Missing authentication on {profile} profile")

    if 'site_to_site' in ipsec and 'peer' in ipsec['site_to_site']:
        for peer, peer_conf in ipsec['site_to_site']['peer'].items():
            has_default_esp = False
            if 'default_esp_group' in peer_conf:
                has_default_esp = True
                if 'esp_group' not in ipsec or peer_conf['default_esp_group'] not in ipsec['esp_group']:
                    raise ConfigError(f"Invalid esp-group on site-to-site peer {peer}")

            if 'ike_group' in peer_conf:
                if 'ike_group' not in ipsec or peer_conf['ike_group'] not in ipsec['ike_group']:
                    raise ConfigError(f"Invalid ike-group on site-to-site peer {peer}")
            else:
                raise ConfigError(f"Missing ike-group on site-to-site peer {peer}")

            if 'authentication' not in peer_conf or 'mode' not in peer_conf['authentication']:
                raise ConfigError(f"Missing authentication on site-to-site peer {peer}")

            if peer_conf['authentication']['mode'] == 'x509':
                if 'x509' not in peer_conf['authentication']:
                    raise ConfigError(f"Missing x509 settings on site-to-site peer {peer}")

                if 'key' not in peer_conf['authentication']['x509']:
                    raise ConfigError(f"Missing x509 key on site-to-site peer {peer}")

                if 'ca_cert_file' not in peer_conf['authentication']['x509'] or 'cert_file' not in peer_conf['authentication']['x509']:
                    raise ConfigError(f"Missing x509 settings on site-to-site peer {peer}")

                if 'file' not in peer_conf['authentication']['x509']['key']:
                    raise ConfigError(f"Missing x509 key file on site-to-site peer {peer}")

                for key in ['ca_cert_file', 'cert_file', 'crl_file']:
                    if key in peer_conf['authentication']['x509']:
                        path = os.path.join(X509_PATH, peer_conf['authentication']['x509'][key])
                        if not os.path.exists(path):
                            raise ConfigError(f"File not found for {key} on site-to-site peer {peer}")

                key_path = os.path.join(X509_PATH, peer_conf['authentication']['x509']['key']['file'])
                if not os.path.exists(key_path):
                    raise ConfigError(f"Private key not found on site-to-site peer {peer}")

            if peer_conf['authentication']['mode'] == 'rsa':
                if not verify_rsa_local_key(ipsec):
                    raise ConfigError(f"Invalid key on rsa-keys local-key")

                if 'rsa_key_name' not in peer_conf['authentication']:
                    raise ConfigError(f"Missing rsa-key-name on site-to-site peer {peer}")

                if not verify_rsa_key(ipsec, peer_conf['authentication']['rsa_key_name']):
                    raise ConfigError(f"Invalid rsa-key-name on site-to-site peer {peer}")

            if 'local_address' not in peer_conf and 'dhcp_interface' not in peer_conf:
                raise ConfigError(f"Missing local-address or dhcp-interface on site-to-site peer {peer}")

            if 'dhcp_interface' in peer_conf:
                dhcp_interface = peer_conf['dhcp_interface']

                verify_interface_exists(dhcp_interface)

                if not os.path.exists(f'{DHCP_BASE}_{dhcp_interface}.conf'):
                    raise ConfigError(f"Invalid dhcp-interface on site-to-site peer {peer}")

                address = get_dhcp_address(dhcp_interface)
                count = 0
                while not address and count < dhcp_wait_attempts:
                    address = get_dhcp_address(dhcp_interface)
                    count += 1
                    sleep(dhcp_wait_sleep)

                if not address:
                    ipsec['dhcp_no_address'][peer] = dhcp_interface
                    print(f"Failed to get address from dhcp-interface on site-to-site peer {peer} -- skipped")
                    continue

            if 'vti' in peer_conf:
                if 'local_address' in peer_conf and 'dhcp_interface' in peer_conf:
                    raise ConfigError(f"A single local-address or dhcp-interface is required when using VTI on site-to-site peer {peer}")

                if 'bind' in peer_conf['vti']:
                    vti_interface = peer_conf['vti']['bind']
                    if not os.path.exists(f'/sys/class/net/{vti_interface}'):
                        raise ConfigError(f'VTI interface {vti_interface} for site-to-site peer {peer} does not exist!')

            if 'vti' not in peer_conf and 'tunnel' not in peer_conf:
                raise ConfigError(f"No VTI or tunnel specified on site-to-site peer {peer}")

            if 'tunnel' in peer_conf:
                for tunnel, tunnel_conf in peer_conf['tunnel'].items():
                    if 'esp_group' not in tunnel_conf and not has_default_esp:
                        raise ConfigError(f"Missing esp-group on tunnel {tunnel} for site-to-site peer {peer}")

                    esp_group_name = tunnel_conf['esp_group'] if 'esp_group' in tunnel_conf else peer_conf['default_esp_group']

                    if esp_group_name not in ipsec['esp_group']:
                        raise ConfigError(f"Invalid esp-group on tunnel {tunnel} for site-to-site peer {peer}")

                    esp_group = ipsec['esp_group'][esp_group_name]

                    if 'mode' in esp_group and esp_group['mode'] == 'transport':
                        if 'protocol' in tunnel_conf and ((peer in ['any', '0.0.0.0']) or ('local_address' not in peer_conf or peer_conf['local_address'] in ['any', '0.0.0.0'])):
                            raise ConfigError(f"Fixed local-address or peer required when a protocol is defined with ESP transport mode on tunnel {tunnel} for site-to-site peer {peer}")

                        if ('local' in tunnel_conf and 'prefix' in tunnel_conf['local']) or ('remote' in tunnel_conf and 'prefix' in tunnel_conf['remote']):
                            raise ConfigError(f"Local/remote prefix cannot be used with ESP transport mode on tunnel {tunnel} for site-to-site peer {peer}")

def generate(ipsec):
    data = {}

    if ipsec:
        if ipsec['dhcp_no_address']:
            with open(DHCP_HOOK_IFLIST, 'w') as f:
                f.write(" ".join(ipsec['dhcp_no_address'].values()))

        data = ipsec
        data['authby'] = authby_translate
        data['ciphers'] = {'ike': ike_ciphers, 'esp': esp_ciphers}
        data['marks'] = {}
        data['rsa_local_key'] = verify_rsa_local_key(ipsec)

        if 'site_to_site' in data and 'peer' in data['site_to_site']:
            for peer, peer_conf in ipsec['site_to_site']['peer'].items():
                if peer in ipsec['dhcp_no_address']:
                    continue

                if peer_conf['authentication']['mode'] == 'x509':
                    cert_file = os.path.join(X509_PATH, peer_conf['authentication']['x509']['cert_file'])
                    call(f'cp -f {cert_file} {CERT_PATH}')

                    key_file = os.path.join(X509_PATH, peer_conf['authentication']['x509']['key']['file'])
                    call(f'cp -f {key_file} {KEY_PATH}')

                    ca_cert_file = os.path.join(X509_PATH, peer_conf['authentication']['x509']['ca_cert_file'])
                    call(f'cp -f {ca_cert_file} {CA_PATH}')

                    if 'crl_file' in peer_conf['authentication']['x509']:
                        crl_file = os.path.join(X509_PATH, peer_conf['authentication']['x509']['crl_file'])
                        call(f'cp -f {crl_file} {CRL_PATH}')

                local_ip = ''
                if 'local_address' in peer_conf:
                    local_ip = peer_conf['local_address']
                elif 'dhcp_interface' in peer_conf:
                    local_ip = get_dhcp_address(peer_conf['dhcp_interface'])

                data['site_to_site']['peer'][peer]['local_address'] = local_ip

                if 'vti' in peer_conf and 'bind' in peer_conf['vti']:
                    vti_interface = peer_conf['vti']['bind']
                    data['marks'][vti_interface] = get_mark(vti_interface)

                if 'tunnel' in peer_conf:
                    for tunnel, tunnel_conf in peer_conf['tunnel'].items():
                        local_prefixes = dict_search('local.prefix', tunnel_conf)
                        remote_prefixes = dict_search('remote.prefix', tunnel_conf)

                        if not local_prefixes or not remote_prefixes:
                            continue

                        passthrough = []

                        for local_prefix in local_prefixes:
                            for remote_prefix in remote_prefixes:
                                if cidr_fit(local_prefix, remote_prefix):
                                    passthrough.append(local_prefix)

                        data['site_to_site']['peer'][peer]['tunnel'][tunnel]['passthrough'] = passthrough

        if 'logging' in ipsec and 'log_modes' in ipsec['logging']:
            modes = ipsec['logging']['log_modes']
            level = ipsec['logging']['log_level'] if 'log_level' in ipsec['logging'] else '1'
            if isinstance(modes, str):
                modes = [modes]
            if 'any' in modes:
                modes = any_log_modes
            data['charondebug'] = f' {level}, '.join(modes) + ' ' + level

    render("/etc/ipsec.conf", "ipsec/ipsec.conf.tmpl", data)
    render("/etc/ipsec.secrets", "ipsec/ipsec.secrets.tmpl", data)
    render("/etc/strongswan.d/interfaces_use.conf", "ipsec/interfaces_use.conf.tmpl", data)
    render("/run/swanctl/swanctl.conf", "ipsec/swanctl.conf.tmpl", data)

def resync_l2tp(ipsec):
    if ipsec and not ipsec['l2tp_exists']:
        return

    tmp = run('/usr/libexec/vyos/conf_mode/ipsec-settings.py')
    if tmp > 0:
        print('ERROR: failed to reapply L2TP IPSec settings!')

def resync_nhrp(ipsec):
    if ipsec and not ipsec['nhrp_exists']:
        return

    tmp = run('/usr/libexec/vyos/conf_mode/protocols_nhrp.py')
    if tmp > 0:
        print('ERROR: failed to reapply NHRP settings!')

def apply(ipsec):
    if not ipsec:
        call('sudo /usr/sbin/ipsec stop')
    else:
        should_start = ('profile' in ipsec or dict_search('site_to_site.peer', ipsec))

        if not process_named_running('charon') and should_start:
            args = f'--auto-update {ipsec["auto_update"]}' if 'auto_update' in ipsec else ''
            call(f'sudo /usr/sbin/ipsec start {args}')
        elif not should_start:
            call('sudo /usr/sbin/ipsec stop')
        elif ipsec['interface_change']:
            call('sudo /usr/sbin/ipsec restart')
        else:
            call('sudo /usr/sbin/ipsec rereadall')
            call('sudo /usr/sbin/ipsec reload')

        if should_start:
            sleep(2) # Give charon enough time to start
            call('sudo /usr/sbin/swanctl -q')

    resync_l2tp(ipsec)
    resync_nhrp(ipsec)

def get_mark(vti_interface):
    vti_num = int(vti_interface.lstrip('vti'))
    return mark_base + vti_num

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