#!/usr/bin/env python3 # # Copyright (C) 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 from netifaces import interfaces from sys import exit from vyos.config import Config from vyos.configdict import get_interface_dict from vyos.ifconfig import MACsecIf from vyos.ifconfig import Interface from vyos.template import render from vyos.util import call 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_source_interface 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'] macsec = get_interface_dict(conf, base) # MACsec is "special" the default MTU is 1460 - update accordingly # as the config_level is already st in get_interface_dict() - we can use [] tmp = conf.get_config_dict([], key_mangling=('-', '_'), get_first_key=True) if 'mtu' not in tmp: # base MTU for MACsec is 1468 bytes, but we leave room for 802.1ad and # 802.1q VLAN tags, thus the limit is 1460 bytes. macsec['mtu'] = '1460' # Check if interface has been removed if 'deleted' in macsec: source_interface = conf.return_effective_value(['source-interface']) macsec.update({'source_interface': source_interface}) 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) if not (('security' in macsec) and ('cipher' in macsec['security'])): raise ConfigError( 'Cipher suite must be set for MACsec "{ifname}"'.format(**macsec)) if (('security' in macsec) and ('encrypt' in macsec['security'])): tmp = macsec.get('security') if not (('mka' in tmp) and ('cak' in tmp['mka']) and ('ckn' in tmp['mka'])): raise ConfigError('Missing mandatory MACsec security ' 'keys as encryption is enabled!') 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.tmpl', macsec) return None def apply(macsec): # Remove macsec interface if 'deleted' in macsec: call('systemctl stop wpa_supplicant-macsec@{source_interface}' .format(**macsec)) if macsec['ifname'] in interfaces(): tmp = MACsecIf(macsec['ifname']) tmp.remove() # delete configuration on interface removal if os.path.isfile(wpa_suppl_conf.format(**macsec)): os.unlink(wpa_suppl_conf.format(**macsec)) else: # This is a special type of interface which needs additional parameters # when created using iproute2. Instead of passing a ton of arguments, # use a dictionary provided by the interface class which holds all the # options necessary. conf = MACsecIf.get_config() conf['source_interface'] = macsec['source_interface'] conf['security_cipher'] = macsec['security']['cipher'] # 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['ifname'], **conf) i.update(macsec) call('systemctl restart wpa_supplicant-macsec@{source_interface}' .format(**macsec)) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)