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#!/usr/bin/env python3
#
# Copyright (C) 2018 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
import sys
import subprocess
import syslog as sl
from vyos import ConfigError
dir = r'/config/auth/wireguard'
pk = dir + '/private.key'
pub = dir + '/public.key'
psk = dir + '/preshared.key'
def check_kmod():
""" check if kmod is loaded, if not load it """
if not os.path.exists('/sys/module/wireguard'):
sl.syslog(sl.LOG_NOTICE, "loading wirguard kmod")
if os.system('sudo modprobe wireguard') != 0:
sl.syslog(sl.LOG_ERR, "modprobe wireguard failed")
raise ConfigError("modprobe wireguard failed")
def generate_keypair():
""" generates a keypair which is stored in /config/auth/wireguard """
ret = subprocess.call(['wg genkey | tee ' + pk + '|wg pubkey > ' + pub], shell=True)
if ret != 0:
raise ConfigError("wireguard key-pair generation failed")
else:
sl.syslog(sl.LOG_NOTICE, "new keypair wireguard key generated in " + dir)
def genkey():
""" helper function to check, regenerate the keypair """
old_umask = os.umask(0o077)
if os.path.exists(pk) and os.path.exists(pub):
try:
choice = input("You already have a wireguard key-pair already, do you want to re-generate? [y/n] ")
if choice == 'y' or choice == 'Y':
generate_keypair()
except KeyboardInterrupt:
sys.exit(0)
else:
""" if keypair is bing executed from a running iso """
if not os.path.exists(dir):
os.umask(old_umask)
subprocess.call(['sudo mkdir -p ' + dir], shell=True)
subprocess.call(['sudo chgrp vyattacfg ' + dir], shell=True)
subprocess.call(['sudo chmod 770 ' + dir], shell=True)
generate_keypair()
os.umask(old_umask)
def showkey(key):
""" helper function to show privkey or pubkey """
if key == "pub":
if os.path.exists(pub):
print ( open(pub).read().strip() )
else:
print("no public key found")
if key == "pk":
if os.path.exists(pk):
print ( open(pk).read().strip() )
else:
print("no private key found")
def genpsk():
""" generates a preshared key and shows it on stdout, it's stroed only in the config """
subprocess.call(['wg genpsk'], shell=True)
if __name__ == '__main__':
check_kmod()
parser = argparse.ArgumentParser(description='wireguard key management')
parser.add_argument('--genkey', action="store_true", help='generate key-pair')
parser.add_argument('--showpub', action="store_true", help='shows public key')
parser.add_argument('--showpriv', action="store_true", help='shows private key')
parser.add_argument('--genpsk', action="store_true", help='generates preshared-key')
args = parser.parse_args()
try:
if args.genkey:
genkey()
if args.showpub:
showkey("pub")
if args.showpriv:
showkey("pk")
if args.genpsk:
genpsk()
except ConfigError as e:
print(e)
sys.exit(1)
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