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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
import os
from jinja2 import Template
from ipaddress import ip_interface
from vyos.template import is_ipv4
from vyos.template import is_ipv6
from vyos.util import cmd
from vyos.util import popen
if os.geteuid() != 0:
exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
tmpl = """
[Interface]
PrivateKey = {{ privkey }}
{% if address is defined and address|length > 0 %}
Address = {{ address | join(', ')}}
{% endif %}
[Peer]
PublicKey = {{ system_pubkey }}
Endpoint = {{ server }}:{{ port }}
AllowedIPs = 0.0.0.0/0, ::/0
"""
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("-i", "--interface", type=str, help='WireGuard interface the client is connecting to', required=True)
parser.add_argument("-s", "--server", type=str, help='WireGuard server IPv4/IPv6 address or FQDN', required=True)
parser.add_argument("-a", "--address", type=str, help='WireGuard client IPv4/IPv6 address', action='append')
args = parser.parse_args()
interface = args.interface
wg_pubkey = cmd(f'wg show {interface} | grep "public key"').split(':')[-1].lstrip()
wg_port = cmd(f'wg show {interface} | grep "listening port"').split(':')[-1].lstrip()
# Generate WireGuard private key
privkey,_ = popen('wg genkey')
# Generate public key portion from given private key
pubkey,_ = popen('wg pubkey', input=privkey)
config = {
'system_pubkey' : wg_pubkey,
'privkey': privkey,
'pubkey' : pubkey,
'server' : args.server,
'port' : wg_port,
'address' : [],
}
if args.address:
v4_addr = 0
v6_addr = 0
for tmp in args.address:
try:
config['address'].append(str(ip_interface(tmp)))
if is_ipv4(tmp):
v4_addr += 1
elif is_ipv6(tmp):
v6_addr += 1
except:
print(tmp)
exit('Client IP address invalid!')
if (v4_addr > 1) or (v6_addr > 1):
exit('Client can only have one IPv4 and one IPv6 address.')
tmp = Template(tmpl, trim_blocks=True).render(config)
qrcode,err = popen('qrencode -t ansiutf8', input=tmp)
print(f'\nWireGuard client configuration for interface: {interface}')
print(tmp)
print('\n')
print(qrcode)
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