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interfaces-wireguard.py
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interfaces-wireguard.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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 os
import re
from sys import exit
from copy import deepcopy
from netifaces import interfaces
from vyos.config import Config
from vyos.configdict import list_diff
from vyos.ifconfig import WireGuardIf
from vyos.util import run, is_bridge_member
from vyos import ConfigError
kdir = r'/config/auth/wireguard'
default_config_data = {
'intfc': '',
'address': [],
'address_remove': [],
'description': '',
'lport': None,
'deleted': False,
'disable': False,
'fwmark': 0x00,
'mtu': 1420,
'peer': [],
'peer_remove': [], # stores public keys of peers to remove
'pk': f'{kdir}/default/private.key'
}
def _check_kmod():
modules = ['wireguard']
for module in modules:
if not os.path.exists(f'/sys/module/{module}'):
if run(f'modprobe {module}') != 0:
raise ConfigError(f'Loading Kernel module {module} failed')
def _migrate_default_keys():
if os.path.exists(f'{kdir}/private.key') and not os.path.exists(f'{kdir}/default/private.key'):
old_umask = os.umask(0o027)
location = f'{kdir}/default'
run(f'sudo mkdir -p {location}')
run(f'sudo chgrp vyattacfg {location}')
run(f'sudo chmod 750 {location}')
os.rename(f'{kdir}/private.key', f'{location}/private.key')
os.rename(f'{kdir}/public.key', f'{location}/public.key')
os.umask(old_umask)
def get_config():
conf = Config()
base = ['interfaces', 'wireguard']
# determine tagNode instance
if 'VYOS_TAGNODE_VALUE' not in os.environ:
raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
wg = deepcopy(default_config_data)
wg['intf'] = os.environ['VYOS_TAGNODE_VALUE']
# Check if interface has been removed
if not conf.exists(base + [wg['intf']]):
wg['deleted'] = True
return wg
conf.set_level(base + [wg['intf']])
# retrieve configured interface addresses
if conf.exists(['address']):
wg['address'] = conf.return_values(['address'])
# get interface addresses (currently effective) - to determine which
# address is no longer valid and needs to be removed
eff_addr = conf.return_effective_values(['address'])
wg['address_remove'] = list_diff(eff_addr, wg['address'])
# retrieve interface description
if conf.exists(['description']):
wg['description'] = conf.return_value(['description'])
# disable interface
if conf.exists(['disable']):
wg['disable'] = True
# local port to listen on
if conf.exists(['port']):
wg['lport'] = conf.return_value(['port'])
# fwmark value
if conf.exists(['fwmark']):
wg['fwmark'] = int(conf.return_value(['fwmark']))
# Maximum Transmission Unit (MTU)
if conf.exists('mtu'):
wg['mtu'] = int(conf.return_value(['mtu']))
# private key
if conf.exists(['private-key']):
wg['pk'] = "{0}/{1}/private.key".format(
kdir, conf.return_value(['private-key']))
# peer removal, wg identifies peers by its pubkey
peer_eff = conf.list_effective_nodes(['peer'])
peer_rem = list_diff(peer_eff, conf.list_nodes(['peer']))
for peer in peer_rem:
wg['peer_remove'].append(
conf.return_effective_value(['peer', peer, 'pubkey']))
# peer settings
if conf.exists(['peer']):
for p in conf.list_nodes(['peer']):
# set new config level for this peer
conf.set_level(base + [wg['intf'], 'peer', p])
peer = {
'allowed-ips': [],
'address': '',
'name': p,
'persistent_keepalive': '',
'port': '',
'psk': '',
'pubkey': ''
}
# peer allowed-ips
if conf.exists(['allowed-ips']):
peer['allowed-ips'] = conf.return_values(['allowed-ips'])
# peer address
if conf.exists(['address']):
peer['address'] = conf.return_value(['address'])
# peer port
if conf.exists(['port']):
peer['port'] = conf.return_value(['port'])
# persistent-keepalive
if conf.exists(['persistent-keepalive']):
peer['persistent_keepalive'] = conf.return_value(['persistent-keepalive'])
# preshared-key
if conf.exists(['preshared-key']):
peer['psk'] = conf.return_value(['preshared-key'])
# peer pubkeys
if conf.exists(['pubkey']):
key_eff = conf.return_effective_value(['pubkey'])
key_cfg = conf.return_value(['pubkey'])
peer['pubkey'] = key_cfg
# on a pubkey change we need to remove the pubkey first
# peers are identified by pubkey, so key update means
# peer removal and re-add
if key_eff != key_cfg and key_eff != None:
wg['peer_remove'].append(key_cfg)
# if a peer is disabled, we have to exec a remove for it's pubkey
if conf.exists(['disable']):
wg['peer_remove'].append(peer['pubkey'])
else:
wg['peer'].append(peer)
return wg
def verify(wg):
interface = wg['intf']
if wg['deleted']:
is_member, bridge = is_bridge_member(interface)
if is_member:
# can not use a f'' formatted-string here as bridge would not get
# expanded in the print statement
raise ConfigError('Can not delete interface "{0}" as it ' \
'is a member of bridge "{1}"!'.format(interface, bridge))
return None
if not os.path.exists(wg['pk']):
raise ConfigError('No keys found, generate them by executing:\n' \
'"run generate wireguard [keypair|named-keypairs]"')
if not wg['address']:
raise ConfigError(f'IP address required for interface "{interface}"!')
if not wg['peer']:
raise ConfigError(f'Peer required for interface "{interface}"!')
# run checks on individual configured WireGuard peer
for peer in wg['peer']:
peer_name = peer['name']
if not peer['allowed-ips']:
raise ConfigError(f'Peer allowed-ips required for peer "{peer_name}"!')
if not peer['pubkey']:
raise ConfigError(f'Peer public-key required for peer "{peer_name}"!')
def apply(wg):
# no wg configs left, remove all interface from system
# maybe move it into ifconfig.py
if wg['deleted']:
net_devs = os.listdir('/sys/class/net/')
for dev in net_devs:
if os.path.isdir('/sys/class/net/' + dev):
buf = open('/sys/class/net/' + dev + '/uevent', 'r').read()
if re.search("DEVTYPE=wireguard", buf, re.I | re.M):
wg_intf = re.sub("INTERFACE=", "", re.search(
"INTERFACE=.*", buf, re.I | re.M).group(0))
# XXX: we are ignoring any errors here
run(f'ip link del dev {wg_intf} >/dev/null')
return None
# init wg class
w = WireGuardIf(wg['intf'])
# single interface removal
if wg['deleted']:
w.remove()
return None
# Configure interface address(es)
# - not longer required addresses get removed first
# - newly addresses will be added second
for addr in wg['address_remove']:
w.del_addr(addr)
for addr in wg['address']:
w.add_addr(addr)
# Maximum Transmission Unit (MTU)
w.set_mtu(wg['mtu'])
# update interface description used e.g. within SNMP
w.set_alias(wg['description'])
# remove peers
for pub_key in wg['peer_remove']:
w.remove_peer(pub_key)
# peer pubkey
# setting up the wg interface
w.config['private-key'] = c['pk']
for peer in wg['peer']:
# peer pubkey
w.config['pubkey'] = peer['pubkey']
# peer allowed-ips
w.config['allowed-ips'] = peer['allowed-ips']
# local listen port
if wg['lport']:
w.config['port'] = wg['lport']
# fwmark
if c['fwmark']:
w.config['fwmark'] = wg['fwmark']
# endpoint
if peer['address'] and peer['port']:
w.config['endpoint'] = '{}:{}'.format(
peer['address'], peer['port'])
# persistent-keepalive
if peer['persistent_keepalive']:
w.config['keepalive'] = peer['persistent_keepalive']
# maybe move it into ifconfig.py
# preshared-key - needs to be read from a file
if peer['psk']:
psk_file = '/config/auth/wireguard/psk'
old_umask = os.umask(0o077)
open(psk_file, 'w').write(str(c['peer'][p]['psk']))
os.umask(old_umask)
w.config['psk'] = psk_file
w.update()
# Enable/Disable interface
if wg['disable']:
w.set_admin_state('down')
else:
w.set_admin_state('up')
return None
if __name__ == '__main__':
try:
_check_kmod()
_migrate_default_keys()
c = get_config()
verify(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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