#!/usr/bin/env python3 # # Copyright (C) 2021-2022 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 . from vyos.config import Config from vyos.configdict import node_changed from vyos.firewall import find_nftables_rule from vyos.firewall import remove_nftables_rule from vyos.template import render from vyos.util import process_named_running from vyos.util import run from vyos import ConfigError from vyos import airbag airbag.enable() opennhrp_conf = '/run/opennhrp/opennhrp.conf' def get_config(config=None): if config: conf = config else: conf = Config() base = ['protocols', 'nhrp'] nhrp = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) nhrp['del_tunnels'] = node_changed(conf, base + ['tunnel'], key_mangling=('-', '_')) if not conf.exists(base): return nhrp nhrp['if_tunnel'] = conf.get_config_dict(['interfaces', 'tunnel'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) nhrp['profile_map'] = {} profile = conf.get_config_dict(['vpn', 'ipsec', 'profile'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) for name, profile_conf in profile.items(): if 'bind' in profile_conf and 'tunnel' in profile_conf['bind']: interfaces = profile_conf['bind']['tunnel'] if isinstance(interfaces, str): interfaces = [interfaces] for interface in interfaces: nhrp['profile_map'][interface] = name return nhrp def verify(nhrp): if 'tunnel' in nhrp: for name, nhrp_conf in nhrp['tunnel'].items(): if not nhrp['if_tunnel'] or name not in nhrp['if_tunnel']: raise ConfigError(f'Tunnel interface "{name}" does not exist') tunnel_conf = nhrp['if_tunnel'][name] if 'encapsulation' not in tunnel_conf or tunnel_conf['encapsulation'] != 'gre': raise ConfigError(f'Tunnel "{name}" is not an mGRE tunnel') if 'remote' in tunnel_conf: raise ConfigError(f'Tunnel "{name}" cannot have a remote address defined') if 'map' in nhrp_conf: for map_name, map_conf in nhrp_conf['map'].items(): if 'nbma_address' not in map_conf: raise ConfigError(f'nbma-address missing on map {map_name} on tunnel {name}') if 'dynamic_map' in nhrp_conf: for map_name, map_conf in nhrp_conf['dynamic_map'].items(): if 'nbma_domain_name' not in map_conf: raise ConfigError(f'nbma-domain-name missing on dynamic-map {map_name} on tunnel {name}') if 'cisco_authentication' in nhrp_conf: if len(nhrp_conf['cisco_authentication']) > 8: raise ConfigError('Maximum length of the secret is 8 characters!') return None def generate(nhrp): render(opennhrp_conf, 'nhrp/opennhrp.conf.j2', nhrp) return None def apply(nhrp): if 'tunnel' in nhrp: for tunnel, tunnel_conf in nhrp['tunnel'].items(): if 'source_address' in nhrp['if_tunnel'][tunnel]: comment = f'VYOS_NHRP_{tunnel}' source_address = nhrp['if_tunnel'][tunnel]['source_address'] rule_handle = find_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', ['ip protocol gre', f'ip saddr {source_address}', 'ip daddr 224.0.0.0/4']) if not rule_handle: run(f'sudo nft insert rule ip filter VYOS_FW_OUTPUT ip protocol gre ip saddr {source_address} ip daddr 224.0.0.0/4 counter drop comment "{comment}"') for tunnel in nhrp['del_tunnels']: comment = f'VYOS_NHRP_{tunnel}' rule_handle = find_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', [f'comment "{comment}"']) if rule_handle: remove_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', rule_handle) action = 'restart' if nhrp and 'tunnel' in nhrp else 'stop' run(f'systemctl {action} opennhrp') return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)