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interfaces-macsec.py
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interfaces-macsec.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020-2022 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
from netifaces import interfaces
from sys import exit
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configdict import is_node_changed
from vyos.configverify import verify_vrf
from vyos.configverify import verify_address
from vyos.configverify import verify_bridge_delete
from vyos.configverify import verify_mtu_ipv6
from vyos.configverify import verify_mirror_redirect
from vyos.configverify import verify_source_interface
from vyos.configverify import verify_bond_bridge_member
from vyos.ifconfig import MACsecIf
from vyos.ifconfig import Interface
from vyos.template import render
from vyos.util import call
from vyos.util import dict_search
from vyos.util import is_systemd_service_running
from vyos import ConfigError
from vyos import airbag
airbag.enable()
# XXX: wpa_supplicant works on the source interface
wpa_suppl_conf = '/run/wpa_supplicant/{source_interface}.conf'
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'macsec']
ifname, macsec = get_interface_dict(conf, base)
# Check if interface has been removed
if 'deleted' in macsec:
source_interface = conf.return_effective_value(base + [ifname, 'source-interface'])
macsec.update({'source_interface': source_interface})
if is_node_changed(conf, base + [ifname, 'security']):
macsec.update({'shutdown_required': {}})
if is_node_changed(conf, base + [ifname, 'source_interface']):
macsec.update({'shutdown_required': {}})
return macsec
def verify(macsec):
if 'deleted' in macsec:
verify_bridge_delete(macsec)
return None
verify_source_interface(macsec)
verify_vrf(macsec)
verify_mtu_ipv6(macsec)
verify_address(macsec)
verify_bond_bridge_member(macsec)
verify_mirror_redirect(macsec)
if dict_search('security.cipher', macsec) == None:
raise ConfigError('Cipher suite must be set for MACsec "{ifname}"'.format(**macsec))
if dict_search('security.encrypt', macsec) != None:
if dict_search('security.mka.cak', macsec) == None or dict_search('security.mka.ckn', macsec) == None:
raise ConfigError('Missing mandatory MACsec security keys as encryption is enabled!')
cak_len = len(dict_search('security.mka.cak', macsec))
if dict_search('security.cipher', macsec) == 'gcm-aes-128' and cak_len != 32:
# gcm-aes-128 requires a 128bit long key - 32 characters (string) = 16byte = 128bit
raise ConfigError('gcm-aes-128 requires a 128bit long key!')
elif dict_search('security.cipher', macsec) == 'gcm-aes-256' and cak_len != 64:
# gcm-aes-128 requires a 128bit long key - 64 characters (string) = 32byte = 256bit
raise ConfigError('gcm-aes-128 requires a 256bit long key!')
if 'source_interface' in macsec:
# MACsec adds a 40 byte overhead (32 byte MACsec + 8 bytes VLAN 802.1ad
# and 802.1q) - we need to check the underlaying MTU if our configured
# MTU is at least 40 bytes less then the MTU of our physical interface.
lower_mtu = Interface(macsec['source_interface']).get_mtu()
if lower_mtu < (int(macsec['mtu']) + 40):
raise ConfigError('MACsec overhead does not fit into underlaying device MTU,\n' \
f'{lower_mtu} bytes is too small!')
return None
def generate(macsec):
render(wpa_suppl_conf.format(**macsec), 'macsec/wpa_supplicant.conf.j2', macsec)
return None
def apply(macsec):
systemd_service = 'wpa_supplicant-macsec@{source_interface}'.format(**macsec)
# Remove macsec interface on deletion or mandatory parameter change
if 'deleted' in macsec or 'shutdown_required' in macsec:
call(f'systemctl stop {systemd_service}')
if macsec['ifname'] in interfaces():
tmp = MACsecIf(macsec['ifname'])
tmp.remove()
if 'deleted' in macsec:
# delete configuration on interface removal
if os.path.isfile(wpa_suppl_conf.format(**macsec)):
os.unlink(wpa_suppl_conf.format(**macsec))
return None
# It is safe to "re-create" the interface always, there is a sanity
# check that the interface will only be create if its non existent
i = MACsecIf(**macsec)
i.update(macsec)
if not is_systemd_service_running(systemd_service) or 'shutdown_required' in macsec:
call(f'systemctl reload-or-restart {systemd_service}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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