#!/usr/bin/env python3 # # Copyright (C) 2021 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 . import ipaddress import os from sys import exit from time import sleep from time import time from vyos.config import Config from vyos.configdict import leaf_node_changed from vyos.configverify import verify_interface_exists from vyos.configdict import dict_merge from vyos.ifconfig import Interface from vyos.pki import encode_public_key from vyos.pki import load_private_key from vyos.pki import wrap_certificate from vyos.pki import wrap_crl from vyos.pki import wrap_public_key from vyos.pki import wrap_private_key from vyos.template import ip_from_cidr from vyos.template import is_ipv4 from vyos.template import is_ipv6 from vyos.template import render from vyos.validate import is_ipv6_link_local from vyos.util import call from vyos.util import dict_search from vyos.util import dict_search_args from vyos.util import run from vyos.xml import defaults from vyos import ConfigError from vyos import airbag airbag.enable() dhcp_wait_attempts = 2 dhcp_wait_sleep = 1 swanctl_dir = '/etc/swanctl' ipsec_conf = '/etc/ipsec.conf' ipsec_secrets = '/etc/ipsec.secrets' charon_conf = '/etc/strongswan.d/charon.conf' charon_dhcp_conf = '/etc/strongswan.d/charon/dhcp.conf' interface_conf = '/etc/strongswan.d/interfaces_use.conf' swanctl_conf = f'{swanctl_dir}/swanctl.conf' default_install_routes = 'yes' vici_socket = '/var/run/charon.vici' CERT_PATH = f'{swanctl_dir}/x509/' PUBKEY_PATH = f'{swanctl_dir}/pubkey/' KEY_PATH = f'{swanctl_dir}/private/' CA_PATH = f'{swanctl_dir}/x509ca/' CRL_PATH = f'{swanctl_dir}/x509crl/' DHCP_BASE = '/var/lib/dhcp/dhclient' DHCP_HOOK_IFLIST = '/tmp/ipsec_dhcp_waiting' def get_config(config=None): if config: conf = config else: conf = Config() base = ['vpn', 'ipsec'] l2tp_base = ['vpn', 'l2tp', 'remote-access', 'ipsec-settings'] if not conf.exists(base): return None # retrieve common dictionary keys ipsec = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) # We have gathered the dict representation of the CLI, but there are default # options which we need to update into the dictionary retrived. default_values = defaults(base) # XXX: T2665: we must safely remove default values for tag nodes, those are # added in a more fine grained way later on del default_values['esp_group'] del default_values['ike_group'] del default_values['remote_access'] ipsec = dict_merge(default_values, ipsec) if 'esp_group' in ipsec: default_values = defaults(base + ['esp-group']) for group in ipsec['esp_group']: ipsec['esp_group'][group] = dict_merge(default_values, ipsec['esp_group'][group]) if 'ike_group' in ipsec: default_values = defaults(base + ['ike-group']) for group in ipsec['ike_group']: ipsec['ike_group'][group] = dict_merge(default_values, ipsec['ike_group'][group]) if 'remote_access' in ipsec and 'connection' in ipsec['remote_access']: default_values = defaults(base + ['remote-access', 'connection']) for rw in ipsec['remote_access']['connection']: ipsec['remote_access']['connection'][rw] = dict_merge(default_values, ipsec['remote_access']['connection'][rw]) ipsec['dhcp_no_address'] = {} ipsec['install_routes'] = 'no' if conf.exists(base + ["options", "disable-route-autoinstall"]) else default_install_routes ipsec['interface_change'] = leaf_node_changed(conf, base + ['interface']) ipsec['nhrp_exists'] = conf.exists(['protocols', 'nhrp', 'tunnel']) ipsec['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) tmp = conf.get_config_dict(l2tp_base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) if tmp: ipsec['l2tp'] = tmp l2tp_defaults = defaults(l2tp_base) ipsec['l2tp'] = dict_merge(l2tp_defaults, ipsec['l2tp']) ipsec['l2tp_outside_address'] = conf.return_value(['vpn', 'l2tp', 'remote-access', 'outside-address']) ipsec['l2tp_ike_default'] = 'aes256-sha1-modp1024,3des-sha1-modp1024,3des-sha1-modp1024' ipsec['l2tp_esp_default'] = 'aes256-sha1,3des-sha1' return ipsec def get_dhcp_address(iface): addresses = Interface(iface).get_addr() if not addresses: return None for address in addresses: if not is_ipv6_link_local(address): return ip_from_cidr(address) return None def verify_pki_x509(pki, x509_conf): if not pki or 'ca' not in pki or 'certificate' not in pki: raise ConfigError(f'PKI is not configured') ca_cert_name = x509_conf['ca_certificate'] cert_name = x509_conf['certificate'] if not dict_search_args(pki, 'ca', ca_cert_name, 'certificate'): raise ConfigError(f'Missing CA certificate on specified PKI CA certificate "{ca_cert_name}"') if not dict_search_args(pki, 'certificate', cert_name, 'certificate'): raise ConfigError(f'Missing certificate on specified PKI certificate "{cert_name}"') if not dict_search_args(pki, 'certificate', cert_name, 'private', 'key'): raise ConfigError(f'Missing private key on specified PKI certificate "{cert_name}"') return True def verify_pki_rsa(pki, rsa_conf): if not pki or 'key_pair' not in pki: raise ConfigError(f'PKI is not configured') local_key = rsa_conf['local_key'] remote_key = rsa_conf['remote_key'] if not dict_search_args(pki, 'key_pair', local_key, 'private', 'key'): raise ConfigError(f'Missing private key on specified local-key "{local_key}"') if not dict_search_args(pki, 'key_pair', remote_key, 'public', 'key'): raise ConfigError(f'Missing public key on specified remote-key "{remote_key}"') return True def verify(ipsec): if not ipsec: return None if 'interfaces' in ipsec : for ifname in ipsec['interface']: verify_interface_exists(ifname) if 'l2tp' in ipsec: if 'esp_group' in ipsec['l2tp']: if 'esp_group' not in ipsec or ipsec['l2tp']['esp_group'] not in ipsec['esp_group']: raise ConfigError(f"Invalid esp-group on L2TP remote-access config") if 'ike_group' in ipsec['l2tp']: if 'ike_group' not in ipsec or ipsec['l2tp']['ike_group'] not in ipsec['ike_group']: raise ConfigError(f"Invalid ike-group on L2TP remote-access config") if 'authentication' not in ipsec['l2tp']: raise ConfigError(f'Missing authentication settings on L2TP remote-access config') if 'mode' not in ipsec['l2tp']['authentication']: raise ConfigError(f'Missing authentication mode on L2TP remote-access config') if not ipsec['l2tp_outside_address']: raise ConfigError(f'Missing outside-address on L2TP remote-access config') if ipsec['l2tp']['authentication']['mode'] == 'pre-shared-secret': if 'pre_shared_secret' not in ipsec['l2tp']['authentication']: raise ConfigError(f'Missing pre shared secret on L2TP remote-access config') if ipsec['l2tp']['authentication']['mode'] == 'x509': if 'x509' not in ipsec['l2tp']['authentication']: raise ConfigError(f'Missing x509 settings on L2TP remote-access config') x509 = ipsec['l2tp']['authentication']['x509'] if 'ca_certificate' not in x509 or 'certificate' not in x509: raise ConfigError(f'Missing x509 certificates on L2TP remote-access config') verify_pki_x509(ipsec['pki'], x509) if 'profile' in ipsec: for profile, profile_conf in ipsec['profile'].items(): if 'esp_group' in profile_conf: if 'esp_group' not in ipsec or profile_conf['esp_group'] not in ipsec['esp_group']: raise ConfigError(f"Invalid esp-group on {profile} profile") else: raise ConfigError(f"Missing esp-group on {profile} profile") if 'ike_group' in profile_conf: if 'ike_group' not in ipsec or profile_conf['ike_group'] not in ipsec['ike_group']: raise ConfigError(f"Invalid ike-group on {profile} profile") else: raise ConfigError(f"Missing ike-group on {profile} profile") if 'authentication' not in profile_conf: raise ConfigError(f"Missing authentication on {profile} profile") if 'remote_access' in ipsec: if 'connection' in ipsec['remote_access']: for name, ra_conf in ipsec['remote_access']['connection'].items(): if 'esp_group' in ra_conf: if 'esp_group' not in ipsec or ra_conf['esp_group'] not in ipsec['esp_group']: raise ConfigError(f"Invalid esp-group on {name} remote-access config") else: raise ConfigError(f"Missing esp-group on {name} remote-access config") if 'ike_group' in ra_conf: if 'ike_group' not in ipsec or ra_conf['ike_group'] not in ipsec['ike_group']: raise ConfigError(f"Invalid ike-group on {name} remote-access config") else: raise ConfigError(f"Missing ike-group on {name} remote-access config") if 'authentication' not in ra_conf: raise ConfigError(f"Missing authentication on {name} remote-access config") if ra_conf['authentication']['server_mode'] == 'x509': if 'x509' not in ra_conf['authentication']: raise ConfigError(f"Missing x509 settings on {name} remote-access config") x509 = ra_conf['authentication']['x509'] if 'ca_certificate' not in x509 or 'certificate' not in x509: raise ConfigError(f"Missing x509 certificates on {name} remote-access config") verify_pki_x509(ipsec['pki'], x509) elif ra_conf['authentication']['server_mode'] == 'pre-shared-secret': if 'pre_shared_secret' not in ra_conf['authentication']: raise ConfigError(f"Missing pre-shared-key on {name} remote-access config") if 'pool' in ra_conf: if 'dhcp' in ra_conf['pool'] and len(ra_conf['pool']) > 1: raise ConfigError(f'Can not use both DHCP and a predefined address pool for "{name}"!') for pool in ra_conf['pool']: if pool == 'dhcp': if dict_search('remote_access.dhcp.server', ipsec) == None: raise ConfigError('IPSec DHCP server is not configured!') elif 'pool' not in ipsec['remote_access'] or pool not in ipsec['remote_access']['pool']: raise ConfigError(f'Requested pool "{pool}" does not exist!') if 'pool' in ipsec['remote_access']: for pool, pool_config in ipsec['remote_access']['pool'].items(): if 'prefix' not in pool_config: raise ConfigError(f'Missing madatory prefix option for pool "{pool}"!') if 'name_server' in pool_config: if len(pool_config['name_server']) > 2: raise ConfigError(f'Only two name-servers are supported for remote-access pool "{pool}"!') for ns in pool_config['name_server']: v4_addr_and_ns = is_ipv4(ns) and not is_ipv4(pool_config['prefix']) v6_addr_and_ns = is_ipv6(ns) and not is_ipv6(pool_config['prefix']) if v4_addr_and_ns or v6_addr_and_ns: raise ConfigError('Must use both IPv4 or IPv6 addresses for pool prefix and name-server adresses!') if 'exclude' in pool_config: for exclude in pool_config['exclude']: v4_addr_and_exclude = is_ipv4(exclude) and not is_ipv4(pool_config['prefix']) v6_addr_and_exclude = is_ipv6(exclude) and not is_ipv6(pool_config['prefix']) if v4_addr_and_exclude or v6_addr_and_exclude: raise ConfigError('Must use both IPv4 or IPv6 addresses for pool prefix and exclude prefixes!') if 'site_to_site' in ipsec and 'peer' in ipsec['site_to_site']: for peer, peer_conf in ipsec['site_to_site']['peer'].items(): has_default_esp = False if 'default_esp_group' in peer_conf: has_default_esp = True if 'esp_group' not in ipsec or peer_conf['default_esp_group'] not in ipsec['esp_group']: raise ConfigError(f"Invalid esp-group on site-to-site peer {peer}") if 'ike_group' in peer_conf: if 'ike_group' not in ipsec or peer_conf['ike_group'] not in ipsec['ike_group']: raise ConfigError(f"Invalid ike-group on site-to-site peer {peer}") else: raise ConfigError(f"Missing ike-group on site-to-site peer {peer}") if 'authentication' not in peer_conf or 'mode' not in peer_conf['authentication']: raise ConfigError(f"Missing authentication on site-to-site peer {peer}") if peer_conf['authentication']['mode'] == 'x509': if 'x509' not in peer_conf['authentication']: raise ConfigError(f"Missing x509 settings on site-to-site peer {peer}") x509 = peer_conf['authentication']['x509'] if 'ca_certificate' not in x509 or 'certificate' not in x509: raise ConfigError(f"Missing x509 certificates on site-to-site peer {peer}") verify_pki_x509(ipsec['pki'], x509) elif peer_conf['authentication']['mode'] == 'rsa': if 'rsa' not in peer_conf['authentication']: raise ConfigError(f"Missing RSA settings on site-to-site peer {peer}") rsa = peer_conf['authentication']['rsa'] if 'local_key' not in rsa: raise ConfigError(f"Missing RSA local-key on site-to-site peer {peer}") if 'remote_key' not in rsa: raise ConfigError(f"Missing RSA remote-key on site-to-site peer {peer}") verify_pki_rsa(ipsec['pki'], rsa) if 'local_address' not in peer_conf and 'dhcp_interface' not in peer_conf: raise ConfigError(f"Missing local-address or dhcp-interface on site-to-site peer {peer}") if 'dhcp_interface' in peer_conf: dhcp_interface = peer_conf['dhcp_interface'] verify_interface_exists(dhcp_interface) if not os.path.exists(f'{DHCP_BASE}_{dhcp_interface}.conf'): raise ConfigError(f"Invalid dhcp-interface on site-to-site peer {peer}") address = get_dhcp_address(dhcp_interface) count = 0 while not address and count < dhcp_wait_attempts: address = get_dhcp_address(dhcp_interface) count += 1 sleep(dhcp_wait_sleep) if not address: ipsec['dhcp_no_address'][peer] = dhcp_interface print(f"Failed to get address from dhcp-interface on site-to-site peer {peer} -- skipped") continue if 'vti' in peer_conf: if 'local_address' in peer_conf and 'dhcp_interface' in peer_conf: raise ConfigError(f"A single local-address or dhcp-interface is required when using VTI on site-to-site peer {peer}") if 'bind' in peer_conf['vti']: vti_interface = peer_conf['vti']['bind'] if not os.path.exists(f'/sys/class/net/{vti_interface}'): raise ConfigError(f'VTI interface {vti_interface} for site-to-site peer {peer} does not exist!') if 'vti' not in peer_conf and 'tunnel' not in peer_conf: raise ConfigError(f"No VTI or tunnel specified on site-to-site peer {peer}") if 'tunnel' in peer_conf: for tunnel, tunnel_conf in peer_conf['tunnel'].items(): if 'esp_group' not in tunnel_conf and not has_default_esp: raise ConfigError(f"Missing esp-group on tunnel {tunnel} for site-to-site peer {peer}") esp_group_name = tunnel_conf['esp_group'] if 'esp_group' in tunnel_conf else peer_conf['default_esp_group'] if esp_group_name not in ipsec['esp_group']: raise ConfigError(f"Invalid esp-group on tunnel {tunnel} for site-to-site peer {peer}") esp_group = ipsec['esp_group'][esp_group_name] if 'mode' in esp_group and esp_group['mode'] == 'transport': if 'protocol' in tunnel_conf and ((peer in ['any', '0.0.0.0']) or ('local_address' not in peer_conf or peer_conf['local_address'] in ['any', '0.0.0.0'])): raise ConfigError(f"Fixed local-address or peer required when a protocol is defined with ESP transport mode on tunnel {tunnel} for site-to-site peer {peer}") if ('local' in tunnel_conf and 'prefix' in tunnel_conf['local']) or ('remote' in tunnel_conf and 'prefix' in tunnel_conf['remote']): raise ConfigError(f"Local/remote prefix cannot be used with ESP transport mode on tunnel {tunnel} for site-to-site peer {peer}") def cleanup_pki_files(): for path in [CERT_PATH, CA_PATH, CRL_PATH, KEY_PATH, PUBKEY_PATH]: if not os.path.exists(path): continue for file in os.listdir(path): file_path = os.path.join(path, file) if os.path.isfile(file_path): os.unlink(file_path) def generate_pki_files_x509(pki, x509_conf): ca_cert_name = x509_conf['ca_certificate'] ca_cert_data = dict_search_args(pki, 'ca', ca_cert_name, 'certificate') ca_cert_crls = dict_search_args(pki, 'ca', ca_cert_name, 'crl') or [] crl_index = 1 cert_name = x509_conf['certificate'] cert_data = dict_search_args(pki, 'certificate', cert_name, 'certificate') key_data = dict_search_args(pki, 'certificate', cert_name, 'private', 'key') protected = 'passphrase' in x509_conf with open(os.path.join(CA_PATH, f'{ca_cert_name}.pem'), 'w') as f: f.write(wrap_certificate(ca_cert_data)) for crl in ca_cert_crls: with open(os.path.join(CRL_PATH, f'{ca_cert_name}_{crl_index}.pem'), 'w') as f: f.write(wrap_crl(crl)) crl_index += 1 with open(os.path.join(CERT_PATH, f'{cert_name}.pem'), 'w') as f: f.write(wrap_certificate(cert_data)) with open(os.path.join(KEY_PATH, f'x509_{cert_name}.pem'), 'w') as f: f.write(wrap_private_key(key_data, protected)) def generate_pki_files_rsa(pki, rsa_conf): local_key_name = rsa_conf['local_key'] local_key_data = dict_search_args(pki, 'key_pair', local_key_name, 'private', 'key') protected = 'passphrase' in rsa_conf remote_key_name = rsa_conf['remote_key'] remote_key_data = dict_search_args(pki, 'key_pair', remote_key_name, 'public', 'key') local_key = load_private_key(local_key_data, rsa_conf['passphrase'] if protected else None) with open(os.path.join(KEY_PATH, f'rsa_{local_key_name}.pem'), 'w') as f: f.write(wrap_private_key(local_key_data, protected)) with open(os.path.join(PUBKEY_PATH, f'{local_key_name}.pem'), 'w') as f: f.write(encode_public_key(local_key.public_key())) with open(os.path.join(PUBKEY_PATH, f'{remote_key_name}.pem'), 'w') as f: f.write(wrap_public_key(remote_key_data)) def generate(ipsec): cleanup_pki_files() if not ipsec: for config_file in [ipsec_conf, ipsec_secrets, charon_dhcp_conf, interface_conf, swanctl_conf]: if os.path.isfile(config_file): os.unlink(config_file) render(charon_conf, 'ipsec/charon.tmpl', {'install_routes': default_install_routes}) return if ipsec['dhcp_no_address']: with open(DHCP_HOOK_IFLIST, 'w') as f: f.write(" ".join(ipsec['dhcp_no_address'].values())) for path in [swanctl_dir, CERT_PATH, CA_PATH, CRL_PATH, PUBKEY_PATH]: if not os.path.exists(path): os.mkdir(path, mode=0o755) if not os.path.exists(KEY_PATH): os.mkdir(KEY_PATH, mode=0o700) if 'l2tp' in ipsec: if 'authentication' in ipsec['l2tp'] and 'x509' in ipsec['l2tp']['authentication']: generate_pki_files_x509(ipsec['pki'], ipsec['l2tp']['authentication']['x509']) if 'remote_access' in ipsec and 'connection' in ipsec['remote_access']: for rw, rw_conf in ipsec['remote_access']['connection'].items(): if 'authentication' in rw_conf and 'x509' in rw_conf['authentication']: generate_pki_files_x509(ipsec['pki'], rw_conf['authentication']['x509']) if 'site_to_site' in ipsec and 'peer' in ipsec['site_to_site']: for peer, peer_conf in ipsec['site_to_site']['peer'].items(): if peer in ipsec['dhcp_no_address']: continue if peer_conf['authentication']['mode'] == 'x509': generate_pki_files_x509(ipsec['pki'], peer_conf['authentication']['x509']) elif peer_conf['authentication']['mode'] == 'rsa': generate_pki_files_rsa(ipsec['pki'], peer_conf['authentication']['rsa']) local_ip = '' if 'local_address' in peer_conf: local_ip = peer_conf['local_address'] elif 'dhcp_interface' in peer_conf: local_ip = get_dhcp_address(peer_conf['dhcp_interface']) ipsec['site_to_site']['peer'][peer]['local_address'] = local_ip if 'tunnel' in peer_conf: for tunnel, tunnel_conf in peer_conf['tunnel'].items(): local_prefixes = dict_search_args(tunnel_conf, 'local', 'prefix') remote_prefixes = dict_search_args(tunnel_conf, 'remote', 'prefix') if not local_prefixes or not remote_prefixes: continue passthrough = [] for local_prefix in local_prefixes: for remote_prefix in remote_prefixes: local_net = ipaddress.ip_network(local_prefix) remote_net = ipaddress.ip_network(remote_prefix) if local_net.overlaps(remote_net): passthrough.append(local_prefix) ipsec['site_to_site']['peer'][peer]['tunnel'][tunnel]['passthrough'] = passthrough render(ipsec_conf, 'ipsec/ipsec.conf.tmpl', ipsec) render(ipsec_secrets, 'ipsec/ipsec.secrets.tmpl', ipsec) render(charon_conf, 'ipsec/charon.tmpl', ipsec) render(charon_dhcp_conf, 'ipsec/charon/dhcp.conf.tmpl', ipsec) render(interface_conf, 'ipsec/interfaces_use.conf.tmpl', ipsec) render(swanctl_conf, 'ipsec/swanctl.conf.tmpl', ipsec) def resync_nhrp(ipsec): if ipsec and not ipsec['nhrp_exists']: return tmp = run('/usr/libexec/vyos/conf_mode/protocols_nhrp.py') if tmp > 0: print('ERROR: failed to reapply NHRP settings!') def wait_for_vici_socket(timeout=5, sleep_interval=0.1): start_time = time() test_command = f'sudo socat -u OPEN:/dev/null UNIX-CONNECT:{vici_socket}' while True: if (start_time + timeout) < time(): return None result = run(test_command) if result == 0: return True sleep(sleep_interval) def apply(ipsec): if not ipsec: call('sudo ipsec stop') else: call('sudo ipsec restart') call('sudo ipsec rereadall') call('sudo ipsec reload') if wait_for_vici_socket(): call('sudo swanctl -q') resync_nhrp(ipsec) if __name__ == '__main__': try: ipsec = get_config() verify(ipsec) generate(ipsec) apply(ipsec) except ConfigError as e: print(e) exit(1)