#!/usr/bin/env python3 # # Copyright (C) 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 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_authentication from vyos.configverify import verify_vrf from vyos.ifconfig import SSTPCIf from vyos.pki import encode_certificate from vyos.pki import find_chain from vyos.pki import load_certificate 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.util import write_file from vyos import ConfigError from vyos import airbag airbag.enable() 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', 'sstpc'] ifname, sstpc = get_interface_dict(conf, base) # We should only terminate the SSTP client session if critical parameters # change. All parameters that can be changed on-the-fly (like interface # description) should not lead to a reconnect! for options in ['authentication', 'no_peer_dns', 'no_default_route', 'server', 'ssl']: if is_node_changed(conf, base + [ifname, options]): sstpc.update({'shutdown_required': {}}) # bail out early - no need to further process other nodes break # Load PKI certificates for later processing sstpc['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) return sstpc def verify(sstpc): if 'deleted' in sstpc: return None verify_authentication(sstpc) verify_vrf(sstpc) if not dict_search('server', sstpc): raise ConfigError('Remote SSTP server must be specified!') if not dict_search('ssl.ca_certificate', sstpc): raise ConfigError('Missing mandatory CA certificate!') return None def generate(sstpc): ifname = sstpc['ifname'] config_sstpc = f'/etc/ppp/peers/{ifname}' sstpc['ca_file_path'] = f'/run/sstpc/{ifname}_ca-cert.pem' if 'deleted' in sstpc: for file in [sstpc['ca_file_path'], config_sstpc]: if os.path.exists(file): os.unlink(file) return None ca_name = sstpc['ssl']['ca_certificate'] pki_ca_cert = sstpc['pki']['ca'][ca_name] loaded_ca_cert = load_certificate(pki_ca_cert['certificate']) loaded_ca_certs = {load_certificate(c['certificate']) for c in sstpc['pki']['ca'].values()} if 'ca' in sstpc['pki'] else {} ca_full_chain = find_chain(loaded_ca_cert, loaded_ca_certs) write_file(sstpc['ca_file_path'], '\n'.join(encode_certificate(c) for c in ca_full_chain)) render(config_sstpc, 'sstp-client/peer.j2', sstpc, permission=0o640) return None def apply(sstpc): ifname = sstpc['ifname'] if 'deleted' in sstpc or 'disable' in sstpc: if os.path.isdir(f'/sys/class/net/{ifname}'): p = SSTPCIf(ifname) p.remove() call(f'systemctl stop ppp@{ifname}.service') return None # reconnect should only be necessary when specific options change, # like server, authentication ... (see get_config() for details) if ((not is_systemd_service_running(f'ppp@{ifname}.service')) or 'shutdown_required' in sstpc): # cleanup system (e.g. FRR routes first) if os.path.isdir(f'/sys/class/net/{ifname}'): p = SSTPCIf(ifname) p.remove() call(f'systemctl restart ppp@{ifname}.service') # When interface comes "live" a hook is called: # /etc/ppp/ip-up.d/96-vyos-sstpc-callback # which triggers SSTPCIf.update() else: if os.path.isdir(f'/sys/class/net/{ifname}'): p = SSTPCIf(ifname) p.update(sstpc) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)