Merge pull request #49 from hagbard-01/current

T793: wireguard: implement fwmark, pre-shared key

1 files changed, 102 insertions, 0 deletions

diff --git a/src/op_mode/wireguard.py b/src/op_mode/wireguard.py
new file mode 100755
index 000000000..14ee66aaf
--- /dev/null
+++ b/src/op_mode/wireguard.py
@@ -0,0 +1,102 @@
+#!/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):
+    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()
+  else:
+    if not os.path.exists(dir):
+      os.mkdir(dir)
+    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)
+