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wireguard.py
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# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import time
from datetime import timedelta
from tempfile import NamedTemporaryFile
from hurry.filesize import size
from hurry.filesize import alternative
from vyos.ifconfig import Interface
from vyos.ifconfig import Operational
from vyos.template import is_ipv6
class WireGuardOperational(Operational):
def _dump(self):
"""Dump wireguard data in a python friendly way."""
last_device = None
output = {}
# Dump wireguard connection data
_f = self._cmd('wg show all dump')
for line in _f.split('\n'):
if not line:
# Skip empty lines and last line
continue
items = line.split('\t')
if last_device != items[0]:
# We are currently entering a new node
device, private_key, public_key, listen_port, fw_mark = items
last_device = device
output[device] = {
'private_key': None if private_key == '(none)' else private_key,
'public_key': None if public_key == '(none)' else public_key,
'listen_port': int(listen_port),
'fw_mark': None if fw_mark == 'off' else int(fw_mark),
'peers': {},
}
else:
# We are entering a peer
(
device,
public_key,
preshared_key,
endpoint,
allowed_ips,
latest_handshake,
transfer_rx,
transfer_tx,
persistent_keepalive,
) = items
if allowed_ips == '(none)':
allowed_ips = []
else:
allowed_ips = allowed_ips.split('\t')
output[device]['peers'][public_key] = {
'preshared_key': None if preshared_key == '(none)' else preshared_key,
'endpoint': None if endpoint == '(none)' else endpoint,
'allowed_ips': allowed_ips,
'latest_handshake': None if latest_handshake == '0' else int(latest_handshake),
'transfer_rx': int(transfer_rx),
'transfer_tx': int(transfer_tx),
'persistent_keepalive': None if persistent_keepalive == 'off' else int(persistent_keepalive),
}
return output
def show_interface(self):
from vyos.config import Config
c = Config()
wgdump = self._dump().get(self.config['ifname'], None)
c.set_level(['interfaces', 'wireguard', self.config['ifname']])
description = c.return_effective_value(['description'])
ips = c.return_effective_values(['address'])
answer = 'interface: {}\n'.format(self.config['ifname'])
if description:
answer += ' description: {}\n'.format(description)
if ips:
answer += ' address: {}\n'.format(', '.join(ips))
answer += ' public key: {}\n'.format(wgdump['public_key'])
answer += ' private key: (hidden)\n'
answer += ' listening port: {}\n'.format(wgdump['listen_port'])
answer += '\n'
for peer in c.list_effective_nodes(['peer']):
if wgdump['peers']:
pubkey = c.return_effective_value(['peer', peer, 'public-key'])
if pubkey in wgdump['peers']:
wgpeer = wgdump['peers'][pubkey]
answer += ' peer: {}\n'.format(peer)
answer += ' public key: {}\n'.format(pubkey)
""" figure out if the tunnel is recently active or not """
status = 'inactive'
if wgpeer['latest_handshake'] is None:
""" no handshake ever """
status = 'inactive'
else:
if int(wgpeer['latest_handshake']) > 0:
delta = timedelta(
seconds=int(time.time() - wgpeer['latest_handshake'])
)
answer += ' latest handshake: {}\n'.format(delta)
if time.time() - int(wgpeer['latest_handshake']) < (60 * 5):
""" Five minutes and the tunnel is still active """
status = 'active'
else:
""" it's been longer than 5 minutes """
status = 'inactive'
elif int(wgpeer['latest_handshake']) == 0:
""" no handshake ever """
status = 'inactive'
answer += ' status: {}\n'.format(status)
if wgpeer['endpoint'] is not None:
answer += ' endpoint: {}\n'.format(wgpeer['endpoint'])
if wgpeer['allowed_ips'] is not None:
answer += ' allowed ips: {}\n'.format(
','.join(wgpeer['allowed_ips']).replace(',', ', ')
)
if wgpeer['transfer_rx'] > 0 or wgpeer['transfer_tx'] > 0:
rx_size = size(wgpeer['transfer_rx'], system=alternative)
tx_size = size(wgpeer['transfer_tx'], system=alternative)
answer += ' transfer: {} received, {} sent\n'.format(
rx_size, tx_size
)
if wgpeer['persistent_keepalive'] is not None:
answer += ' persistent keepalive: every {} seconds\n'.format(
wgpeer['persistent_keepalive']
)
answer += '\n'
return answer
@Interface.register
class WireGuardIf(Interface):
OperationalClass = WireGuardOperational
iftype = 'wireguard'
definition = {
**Interface.definition,
**{
'section': 'wireguard',
'prefixes': [
'wg',
],
'bridgeable': False,
},
}
def get_mac(self):
"""Get a synthetic MAC address."""
return self.get_mac_synthetic()
def update(self, config):
"""General helper function which works on a dictionary retrived by
get_config_dict(). It's main intention is to consolidate the scattered
interface setup code and provide a single point of entry when workin
on any interface."""
tmp_file = NamedTemporaryFile('w')
tmp_file.write(config['private_key'])
tmp_file.flush()
# Wireguard base command is identical for every peer
base_cmd = 'wg set {ifname}'
if 'port' in config:
base_cmd += ' listen-port {port}'
if 'fwmark' in config:
base_cmd += ' fwmark {fwmark}'
base_cmd += f' private-key {tmp_file.name}'
base_cmd = base_cmd.format(**config)
if 'peer' in config:
for peer, peer_config in config['peer'].items():
# T4702: No need to configure this peer when it was explicitly
# marked as disabled - also active sessions are terminated as
# the public key was already removed when entering this method!
if 'disable' in peer_config:
continue
# start of with a fresh 'wg' command
cmd = base_cmd + ' peer {public_key}'
# If no PSK is given remove it by using /dev/null - passing keys via
# the shell (usually bash) is considered insecure, thus we use a file
no_psk_file = '/dev/null'
psk_file = no_psk_file
if 'preshared_key' in peer_config:
psk_file = '/tmp/tmp.wireguard.psk'
with open(psk_file, 'w') as f:
f.write(peer_config['preshared_key'])
cmd += f' preshared-key {psk_file}'
# Persistent keepalive is optional
if 'persistent_keepalive' in peer_config:
cmd += ' persistent-keepalive {persistent_keepalive}'
# Multiple allowed-ip ranges can be defined - ensure we are always
# dealing with a list
if isinstance(peer_config['allowed_ips'], str):
peer_config['allowed_ips'] = [peer_config['allowed_ips']]
cmd += ' allowed-ips ' + ','.join(peer_config['allowed_ips'])
# Endpoint configuration is optional
if {'address', 'port'} <= set(peer_config):
if is_ipv6(peer_config['address']):
cmd += ' endpoint [{address}]:{port}'
else:
cmd += ' endpoint {address}:{port}'
self._cmd(cmd.format(**peer_config))
# PSK key file is not required to be stored persistently as its backed by CLI
if psk_file != no_psk_file and os.path.exists(psk_file):
os.remove(psk_file)
# call base class
super().update(config)

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