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
|
#!/usr/bin/env python3
#
# Copyright (C) 2021-2024 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 argparse
from sys import exit
from socket import getfqdn
from cryptography.x509.oid import NameOID
from vyos.configquery import ConfigTreeQuery
from vyos.pki import CERT_BEGIN
from vyos.pki import CERT_END
from vyos.pki import find_chain
from vyos.pki import encode_certificate
from vyos.pki import load_certificate
from vyos.template import render_to_string
from vyos.utils.io import ask_input
# Apple profiles only support one IKE/ESP encryption cipher and hash, whereas
# VyOS comes with a multitude of different proposals for a connection.
#
# We take all available proposals from the VyOS CLI and ask the user which one
# he would like to get enabled in his profile - thus there is limited possibility
# to select a proposal that is not supported on the connection profile.
#
# IOS supports IKE-SA encryption algorithms:
# - DES
# - 3DES
# - AES-128
# - AES-256
# - AES-128-GCM
# - AES-256-GCM
# - ChaCha20Poly1305
#
vyos2apple_cipher = {
'3des' : '3DES',
'aes128' : 'AES-128',
'aes256' : 'AES-256',
'aes128gcm128' : 'AES-128-GCM',
'aes256gcm128' : 'AES-256-GCM',
'chacha20poly1305' : 'ChaCha20Poly1305',
}
# Windows supports IKE-SA encryption algorithms:
# - DES3
# - AES128
# - AES192
# - AES256
# - GCMAES128
# - GCMAES192
# - GCMAES256
#
vyos2windows_cipher = {
'3des' : 'DES3',
'aes128' : 'AES128',
'aes192' : 'AES192',
'aes256' : 'AES256',
'aes128gcm128' : 'GCMAES128',
'aes192gcm128' : 'GCMAES192',
'aes256gcm128' : 'GCMAES256',
}
# IOS supports IKE-SA integrity algorithms:
# - SHA1-96
# - SHA1-160
# - SHA2-256
# - SHA2-384
# - SHA2-512
#
vyos2apple_integrity = {
'sha1' : 'SHA1-96',
'sha1_160' : 'SHA1-160',
'sha256' : 'SHA2-256',
'sha384' : 'SHA2-384',
'sha512' : 'SHA2-512',
}
# Windows supports IKE-SA integrity algorithms:
# - SHA1-96
# - SHA1-160
# - SHA2-256
# - SHA2-384
# - SHA2-512
#
vyos2windows_integrity = {
'sha1' : 'SHA196',
'sha256' : 'SHA256',
'aes128gmac' : 'GCMAES128',
'aes192gmac' : 'GCMAES192',
'aes256gmac' : 'GCMAES256',
}
# IOS 14.2 and later do no support dh-group 1,2 and 5. Supported DH groups would
# be: 14, 15, 16, 17, 18, 19, 20, 21, 31
ios_supported_dh_groups = ['14', '15', '16', '17', '18', '19', '20', '21', '31']
# Windows 10 only allows a limited set of DH groups
windows_supported_dh_groups = ['1', '2', '14', '24']
parser = argparse.ArgumentParser()
parser.add_argument('--os', const='all', nargs='?', choices=['ios', 'windows'], help='Operating system used for config generation', required=True)
parser.add_argument("--connection", action="store", help='IPsec IKEv2 remote-access connection name from CLI', required=True)
parser.add_argument("--remote", action="store", help='VPN connection remote-address where the client will connect to', required=True)
parser.add_argument("--profile", action="store", help='IKEv2 profile name used in the profile list on the device')
parser.add_argument("--name", action="store", help='VPN connection name as seen in the VPN application later')
args = parser.parse_args()
ipsec_base = ['vpn', 'ipsec']
config_base = ipsec_base + ['remote-access', 'connection']
pki_base = ['pki']
conf = ConfigTreeQuery()
if not conf.exists(config_base):
exit('IPsec remote-access is not configured!')
profile_name = 'VyOS IKEv2 Profile'
if args.profile:
profile_name = args.profile
vpn_name = 'VyOS IKEv2 VPN'
if args.name:
vpn_name = args.name
conn_base = config_base + [args.connection]
if not conf.exists(conn_base):
exit(f'IPsec remote-access connection "{args.connection}" does not exist!')
data = conf.get_config_dict(conn_base, key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
data['profile_name'] = profile_name
data['vpn_name'] = vpn_name
data['remote'] = args.remote
# This is a reverse-DNS style unique identifier used to detect duplicate profiles
tmp = getfqdn().split('.')
tmp = reversed(tmp)
data['rfqdn'] = '.'.join(tmp)
pki = conf.get_config_dict(pki_base, get_first_key=True)
cert_name = data['authentication']['x509']['certificate']
cert_data = load_certificate(pki['certificate'][cert_name]['certificate'])
data['cert_common_name'] = cert_data.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
data['ca_common_name'] = cert_data.issuer.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
data['ca_certificates'] = []
loaded_ca_certs = {load_certificate(c['certificate'])
for c in pki['ca'].values()} if 'ca' in pki else {}
for ca_name in data['authentication']['x509']['ca_certificate']:
loaded_ca_cert = load_certificate(pki['ca'][ca_name]['certificate'])
ca_full_chain = find_chain(loaded_ca_cert, loaded_ca_certs)
for ca in ca_full_chain:
tmp = {
'ca_name' : ca.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value,
'ca_chain' : encode_certificate(ca).replace(CERT_BEGIN, '').replace(CERT_END, '').replace('\n', ''),
}
data['ca_certificates'].append(tmp)
esp_proposals = conf.get_config_dict(ipsec_base + ['esp-group', data['esp_group'], 'proposal'],
key_mangling=('-', '_'), get_first_key=True)
ike_proposal = conf.get_config_dict(ipsec_base + ['ike-group', data['ike_group'], 'proposal'],
key_mangling=('-', '_'), get_first_key=True)
# This script works only for Apple iOS/iPadOS and Windows. Both operating systems
# have different limitations thus we load the limitations based on the operating
# system used.
vyos2client_cipher = vyos2apple_cipher if args.os == 'ios' else vyos2windows_cipher;
vyos2client_integrity = vyos2apple_integrity if args.os == 'ios' else vyos2windows_integrity;
supported_dh_groups = ios_supported_dh_groups if args.os == 'ios' else windows_supported_dh_groups;
# Create a dictionary containing client conform IKE settings
ike = {}
count = 1
for _, proposal in ike_proposal.items():
if {'dh_group', 'encryption', 'hash'} <= set(proposal):
if (proposal['encryption'] in set(vyos2client_cipher) and
proposal['hash'] in set(vyos2client_integrity) and
proposal['dh_group'] in set(supported_dh_groups)):
# We 're-code' from the VyOS IPsec proposals to the Apple naming scheme
proposal['encryption'] = vyos2client_cipher[ proposal['encryption'] ]
proposal['hash'] = vyos2client_integrity[ proposal['hash'] ]
ike.update( { str(count) : proposal } )
count += 1
# Create a dictionary containing Apple conform ESP settings
esp = {}
count = 1
for _, proposal in esp_proposals.items():
if {'encryption', 'hash'} <= set(proposal):
if proposal['encryption'] in set(vyos2client_cipher) and proposal['hash'] in set(vyos2client_integrity):
# We 're-code' from the VyOS IPsec proposals to the Apple naming scheme
proposal['encryption'] = vyos2client_cipher[ proposal['encryption'] ]
proposal['hash'] = vyos2client_integrity[ proposal['hash'] ]
esp.update( { str(count) : proposal } )
count += 1
try:
if len(ike) > 1:
# Propare the input questions for the user
tmp = '\n'
for number, options in ike.items():
tmp += f'({number}) Encryption {options["encryption"]}, Integrity {options["hash"]}, DH group {options["dh_group"]}\n'
tmp += '\nSelect one of the above IKE groups: '
data['ike_encryption'] = ike[ ask_input(tmp, valid_responses=list(ike)) ]
else:
data['ike_encryption'] = ike['1']
if len(esp) > 1:
tmp = '\n'
for number, options in esp.items():
tmp += f'({number}) Encryption {options["encryption"]}, Integrity {options["hash"]}\n'
tmp += '\nSelect one of the above ESP groups: '
data['esp_encryption'] = esp[ ask_input(tmp, valid_responses=list(esp)) ]
else:
data['esp_encryption'] = esp['1']
except KeyboardInterrupt:
exit("Interrupted")
print('\n\n==== <snip> ====')
if args.os == 'ios':
print(render_to_string('ipsec/ios_profile.j2', data))
print('==== </snip> ====\n')
print('Save the XML from above to a new file named "vyos.mobileconfig" and E-Mail it to your phone.')
elif args.os == 'windows':
print(render_to_string('ipsec/windows_profile.j2', data))
print('==== </snip> ====\n')
|
