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wireguard.py
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wireguard.py
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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 shutil
import subprocess
import syslog as sl
import re
from vyos.ifconfig import WireGuardIf
from vyos import ConfigError
from vyos.config import Config
dir = r'/config/auth/wireguard'
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(pk, pub):
""" generates a keypair which is stored in /config/auth/wireguard """
old_umask = os.umask(0o027)
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)
os.umask(old_umask)
def genkey(location):
""" helper function to check, regenerate the keypair """
pk = "{}/private.key".format(location)
pub = "{}/public.key".format(location)
old_umask = os.umask(0o027)
if os.path.exists(pk) and os.path.exists(pub):
try:
choice = input(
"You already have a wireguard key-pair, do you want to re-generate? [y/n] ")
if choice == 'y' or choice == 'Y':
generate_keypair(pk, pub)
except KeyboardInterrupt:
sys.exit(0)
else:
""" if keypair is bing executed from a running iso """
if not os.path.exists(location):
subprocess.call(['sudo mkdir -p ' + location], shell=True)
subprocess.call(['sudo chgrp vyattacfg ' + location], shell=True)
subprocess.call(['sudo chmod 750 ' + location], shell=True)
generate_keypair(pk, pub)
os.umask(old_umask)
def showkey(key):
""" helper function to show privkey or pubkey """
if os.path.exists(key):
print (open(key).read().strip())
else:
print ("{} not found".format(key))
def genpsk():
"""
generates a preshared key and shows it on stdout,
it's stored only in the cli config
"""
subprocess.call(['wg genpsk'], shell=True)
def list_key_dirs():
""" lists all dirs under /config/auth/wireguard """
if os.path.exists(dir):
nks = next(os.walk(dir))[1]
for nk in nks:
print (nk)
def del_key_dir(kname):
""" deletes /config/auth/wireguard/<kname> """
kdir = "{0}/{1}".format(dir,kname)
if not os.path.isdir(kdir):
print ("named keypair {} not found".format(kname))
return 1
shutil.rmtree(kdir)
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')
parser.add_argument(
'--location', action="store", help='key location within {}'.format(dir))
parser.add_argument(
'--listkdir', action="store_true", help='lists named keydirectories')
parser.add_argument(
'--delkdir', action="store_true", help='removes named keydirectories')
parser.add_argument(
'--showinterface', action="store", help='shows interface details')
args = parser.parse_args()
try:
if args.genkey:
if args.location:
genkey("{0}/{1}".format(dir, args.location))
else:
genkey("{}/default".format(dir))
if args.showpub:
if args.location:
showkey("{0}/{1}/public.key".format(dir, args.location))
else:
showkey("{}/default/public.key".format(dir))
if args.showpriv:
if args.location:
showkey("{0}/{1}/private.key".format(dir, args.location))
else:
showkey("{}/default/private.key".format(dir))
if args.genpsk:
genpsk()
if args.listkdir:
list_key_dirs()
if args.showinterface:
intf = WireGuardIf(args.showinterface, create=False, debug=False)
intf.op_show_interface()
if args.delkdir:
if args.location:
del_key_dir(args.location)
else:
del_key_dir("default")
except ConfigError as e:
print(e)
sys.exit(1)

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