#!/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')