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ikev2_profile_generator.py
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ikev2_profile_generator.py
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#!/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 argparse
from jinja2 import Template
from sys import exit
from socket import getfqdn
from cryptography.x509.oid import NameOID
from vyos.configquery import ConfigTreeQuery
from vyos.pki import load_certificate
from vyos.template import render_to_string
from vyos.util 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)
ca_name = data['authentication']['x509']['ca_certificate']
cert_name = data['authentication']['x509']['certificate']
ca_cert = load_certificate(pki['ca'][ca_name]['certificate'])
cert = load_certificate(pki['certificate'][cert_name]['certificate'])
data['ca_cn'] = ca_cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
data['cert_cn'] = cert.subject.get_attributes_for_oid(NameOID.COMMON_NAME)[0].value
data['ca_cert'] = conf.value(pki_base + ['ca', ca_name, 'certificate'])
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')

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ikev2_profile_generator.py (8 KB)

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