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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 sys
import os
import re
import syslog as sl
import subprocess
from vyos.config import Config
from vyos import ConfigError
from vyos.ifconfig import WireGuardIf as wg_if
ifname = str(os.environ['VYOS_TAGNODE_VALUE'])
wg_intfc = wg_if(ifname)
dir = r'/config/auth/wireguard'
pk = dir + '/private.key'
pub = dir + '/public.key'
psk_file = dir + '/psk'
def check_kmod():
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_NOTICE, "modprobe wireguard failed")
raise ConfigError("modprobe wireguard failed")
def get_config():
c = Config()
if not c.exists('interfaces wireguard'):
return None
config_data = {
ifname : {
'addr' : '',
'descr' : ifname,
'lport' : None,
'status' : 'exists',
'state' : 'enabled',
'fwmark' : 0x00,
'mtu' : 1420,
'peer' : {}
}
}
c.set_level('interfaces wireguard')
if not c.exists_effective(ifname):
config_data[ifname]['status'] = 'create'
if not c.exists(ifname) and c.exists_effective(ifname):
config_data[ifname]['status'] = 'delete'
if config_data[ifname]['status'] != 'delete':
if c.exists(ifname + ' address'):
config_data[ifname]['addr'] = c.return_values(ifname + ' address')
if c.exists(ifname + ' disable'):
config_data[ifname]['state'] = 'disable'
if c.exists(ifname + ' port'):
config_data[ifname]['lport'] = c.return_value(ifname + ' port')
if c.exists(ifname + ' fwmark'):
config_data[ifname]['fwmark'] = c.return_value(ifname + ' fwmark')
if c.exists(ifname + ' description'):
config_data[ifname]['descr'] = c.return_value(ifname + ' description')
if c.exists(ifname + ' mtu'):
config_data[ifname]['mtu'] = c.return_value(ifname + ' mtu')
if c.exists(ifname + ' peer'):
for p in c.list_nodes(ifname + ' peer'):
if not c.exists(ifname + ' peer ' + p + ' disable'):
config_data[ifname]['peer'].update(
{
p : {
'allowed-ips' : [],
'endpoint' : '',
'pubkey' : ''
}
}
)
if c.exists(ifname + ' peer ' + p + ' pubkey'):
config_data[ifname]['peer'][p]['pubkey'] = c.return_value(ifname + ' peer ' + p + ' pubkey')
if c.exists(ifname + ' peer ' + p + ' allowed-ips'):
config_data[ifname]['peer'][p]['allowed-ips'] = c.return_values(ifname + ' peer ' + p + ' allowed-ips')
if c.exists(ifname + ' peer ' + p + ' endpoint'):
config_data[ifname]['peer'][p]['endpoint'] = c.return_value(ifname + ' peer ' + p + ' endpoint')
if c.exists(ifname + ' peer ' + p + ' persistent-keepalive'):
config_data[ifname]['peer'][p]['persistent-keepalive'] = c.return_value(ifname + ' peer ' + p + ' persistent-keepalive')
if c.exists(ifname + ' peer ' + p + ' preshared-key'):
config_data[ifname]['peer'][p]['psk'] = c.return_value(ifname + ' peer ' + p + ' preshared-key')
return config_data
def verify(c):
if not c:
return None
if not os.path.exists(pk):
raise ConfigError("No keys found, generate them by executing: \'run generate wireguard keypair\'")
if c[ifname]['status'] != 'delete':
if not c[ifname]['addr']:
raise ConfigError("ERROR: IP address required")
if not c[ifname]['peer']:
raise ConfigError("ERROR: peer required")
for p in c[ifname]['peer']:
if not c[ifname]['peer'][p]['allowed-ips']:
raise ConfigError("ERROR: allowed-ips required for peer " + p)
if not c[ifname]['peer'][p]['pubkey']:
raise ConfigError("peer pubkey required for peer " + p)
def apply(c):
### no wg config left, delete all wireguard devices, if any
if not c:
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))
sl.syslog(sl.LOG_NOTICE, "removing interface " + wg_intf)
subprocess.call(['ip l d dev ' + wg_intf + ' >/dev/null'], shell=True)
return None
### interface removal
if c[ifname]['status'] == 'delete':
sl.syslog(sl.LOG_NOTICE, "removing interface " + ifname)
wg_intfc.remove()
return None
c_eff = Config()
c_eff.set_level('interfaces wireguard')
## interface state
if c[ifname]['state'] == 'disable':
sl.syslog(sl.LOG_NOTICE, "disable interface " + ifname)
wg_intfc.state = 'down'
else:
if not wg_intfc.state == 'up':
sl.syslog(sl.LOG_NOTICE, "enable interface " + ifname)
wg_intfc.state = 'up'
## IP address
if not c_eff.exists_effective(ifname + ' address'):
for ip in c[ifname]['addr']:
wg_intfc.add_addr(ip)
else:
addr_eff = c_eff.return_effective_values(ifname + ' address')
addr_rem = list(set(addr_eff) - set(c[ifname]['addr']))
addr_add = list(set(c[ifname]['addr']) - set(addr_eff))
if len(addr_rem) !=0:
for ip in addr_rem:
sl.syslog(sl.LOG_NOTICE, "remove IP address {0} from {1}".format(ip,ifname))
wg_intfc.del_addr(ip)
if len(addr_add) !=0:
for ip in addr_add:
sl.syslog(sl.LOG_NOTICE, "add IP address {0} to {1}".format(ip,ifname))
wg_intfc.add_addr(ip)
## interface MTU
if c[ifname]['mtu'] != 1420:
wg_intfc.mtu = int(c[ifname]['mtu'])
else:
## default is set to 1420 in config_data
wg_intfc.mtu = int(c[ifname]['mtu'])
## ifalias for snmp from description
descr_eff = c_eff.return_effective_value(ifname + ' description')
if descr_eff != c[ifname]['descr']:
wg_intfc.ifalias = str(c[ifname]['descr'])
## peer deletion
peer_eff = c_eff.list_effective_nodes(ifname + ' peer')
peer_cnf = []
try:
for p in c[ifname]['peer']:
peer_cnf.append(p)
except KeyError:
pass
peer_rem = list(set(peer_eff) - set(peer_cnf))
for p in peer_rem:
pkey = c_eff.return_effective_value( ifname + ' peer ' + p +' pubkey')
wg_intfc.wg_remove_peer(pkey)
## peer key update
for p in peer_eff:
if p in peer_cnf:
ekey = c_eff.return_effective_value( ifname + ' peer ' + p +' pubkey')
nkey = c[ifname]['peer'][p]['pubkey']
if nkey != ekey:
sl.syslog(sl.LOG_NOTICE, "peer {0} pubkey changed from {1} to {2} on interface {3}".format(p, ekey, nkey, ifname))
print ("peer {0} pubkey changed from {1} to {2} on interface {3}".format(p, ekey, nkey, ifname))
wg_intfc.wg_remove_peer(ekey)
wg_intfc.wg_config['private-key'] = pk
for p in c[ifname]['peer']:
wg_intfc.wg_config['pubkey'] = str(c[ifname]['peer'][p]['pubkey'])
wg_intfc.wg_config['allowed-ips'] = (c[ifname]['peer'][p]['allowed-ips'])
## listen-port
if c[ifname]['lport']:
wg_intfc.wg_config['port'] = c[ifname]['lport']
## fwmark
if c[ifname]['fwmark']:
wg_intfc.wg_config['fwmark'] = c[ifname]['fwmark']
## endpoint
if c[ifname]['peer'][p]['endpoint']:
wg_intfc.wg_config['endpoint'] = c[ifname]['peer'][p]['endpoint']
## persistent-keepalive
if 'persistent-keepalive' in c[ifname]['peer'][p]:
wg_intfc.wg_config['keepalive'] = c[ifname]['peer'][p]['persistent-keepalive']
## preshared-key - needs to be read from a file
if 'psk' in c[ifname]['peer'][p]:
old_umask = os.umask(0o077)
open(psk_file, 'w').write(str(c[ifname]['peer'][p]['psk']))
os.umask(old_umask)
wg_intfc.wg_config['psk'] = psk_file
wg_intfc.wg_update()
if __name__ == '__main__':
try:
check_kmod()
c = get_config()
verify(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)
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