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#!/usr/bin/env python3
#
# Copyright (C) 2022 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
import os
from jinja2 import Template
from textwrap import fill
from vyos.configquery import ConfigTreeQuery
from vyos.ifconfig import Section
from vyos.util import cmd
client_config = """
client
nobind
remote {{ remote_host }} {{ port }}
remote-cert-tls server
proto {{ 'tcp-client' if protocol == 'tcp-active' else 'udp' }}
dev {{ device }}
dev-type {{ device }}
persist-key
persist-tun
verb 3
# Encryption options
{% if encryption is defined and encryption is not none %}
{% if encryption.cipher is defined and encryption.cipher is not none %}
cipher {{ encryption.cipher }}
{% if encryption.cipher == 'bf128' %}
keysize 128
{% elif encryption.cipher == 'bf256' %}
keysize 256
{% endif %}
{% endif %}
{% if encryption.ncp_ciphers is defined and encryption.ncp_ciphers is not none %}
data-ciphers {{ encryption.ncp_ciphers }}
{% endif %}
{% endif %}
{% if hash is defined and hash is not none %}
auth {{ hash }}
{% endif %}
keysize 256
comp-lzo {{ '' if use_lzo_compression is defined else 'no' }}
<ca>
-----BEGIN CERTIFICATE-----
{{ ca }}
-----END CERTIFICATE-----
</ca>
<cert>
-----BEGIN CERTIFICATE-----
{{ cert }}
-----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----
{{ key }}
-----END PRIVATE KEY-----
</key>
"""
config = ConfigTreeQuery()
base = ['interfaces', 'openvpn']
if not config.exists(base):
print('OpenVPN not configured')
exit(0)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("-i", "--interface", type=str, help='OpenVPN interface the client is connecting to', required=True)
parser.add_argument("-a", "--ca", type=str, help='OpenVPN CA cerificate', required=True)
parser.add_argument("-c", "--cert", type=str, help='OpenVPN client cerificate', required=True)
parser.add_argument("-k", "--key", type=str, help='OpenVPN client cerificate key', action="store")
args = parser.parse_args()
interface = args.interface
ca = args.ca
cert = args.cert
key = args.key
if not key:
key = args.cert
if interface not in Section.interfaces('openvpn'):
exit(f'OpenVPN interface "{interface}" does not exist!')
if not config.exists(['pki', 'ca', ca, 'certificate']):
exit(f'OpenVPN CA certificate "{ca}" does not exist!')
if not config.exists(['pki', 'certificate', cert, 'certificate']):
exit(f'OpenVPN certificate "{cert}" does not exist!')
if not config.exists(['pki', 'certificate', cert, 'private', 'key']):
exit(f'OpenVPN certificate key "{key}" does not exist!')
ca = config.value(['pki', 'ca', ca, 'certificate'])
ca = fill(ca, width=64)
cert = config.value(['pki', 'certificate', cert, 'certificate'])
cert = fill(cert, width=64)
key = config.value(['pki', 'certificate', key, 'private', 'key'])
key = fill(key, width=64)
remote_host = config.value(base + [interface, 'local-host'])
ovpn_conf = config.get_config_dict(base + [interface], key_mangling=('-', '_'), get_first_key=True)
port = '1194' if 'local_port' not in ovpn_conf else ovpn_conf['local_port']
proto = 'udp' if 'protocol' not in ovpn_conf else ovpn_conf['protocol']
device = 'tun' if 'device_type' not in ovpn_conf else ovpn_conf['device_type']
config = {
'interface' : interface,
'ca' : ca,
'cert' : cert,
'key' : key,
'device' : device,
'port' : port,
'proto' : proto,
'remote_host' : remote_host,
'address' : [],
}
# Clear out terminal first
print('\x1b[2J\x1b[H')
client = Template(client_config, trim_blocks=True).render(config)
print(client)
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