#!/usr/bin/env python3 # # Copyright (C) 2018-2022 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 . import os from sys import exit from vyos.config import Config from vyos.configdict import dict_merge from vyos.pki import wrap_certificate from vyos.pki import wrap_private_key from vyos.template import render from vyos.util import call from vyos.util import check_port_availability from vyos.util import is_systemd_service_running from vyos.util import is_listen_port_bind_service from vyos.util import dict_search from vyos.xml import defaults from vyos import ConfigError from crypt import crypt, mksalt, METHOD_SHA512 from time import sleep from vyos import airbag airbag.enable() cfg_dir = '/run/ocserv' ocserv_conf = cfg_dir + '/ocserv.conf' ocserv_passwd = cfg_dir + '/ocpasswd' ocserv_otp_usr = cfg_dir + '/users.oath' radius_cfg = cfg_dir + '/radiusclient.conf' radius_servers = cfg_dir + '/radius_servers' # Generate hash from user cleartext password def get_hash(password): return crypt(password, mksalt(METHOD_SHA512)) def T2665_default_dict_cleanup(origin: dict, default_values: dict) -> dict: """ https://vyos.dev/T2665 Clear unnecessary key values in merged config by dict_merge function :param origin: config :type origin: dict :param default_values: default values :type default_values: dict :return: merged dict :rtype: dict """ if 'mode' in origin["authentication"] and "local" in \ origin["authentication"]["mode"]: del origin['authentication']['local_users']['username']['otp'] if not origin["authentication"]["local_users"]["username"]: raise ConfigError( 'Openconnect mode local required at least one user') default_ocserv_usr_values = \ default_values['authentication']['local_users']['username']['otp'] for user, params in origin['authentication']['local_users'][ 'username'].items(): # Not every configuration requires OTP settings if origin['authentication']['local_users']['username'][user].get( 'otp'): origin['authentication']['local_users']['username'][user][ 'otp'] = dict_merge(default_ocserv_usr_values, origin['authentication'][ 'local_users']['username'][user][ 'otp']) if 'mode' in origin["authentication"] and "radius" in \ origin["authentication"]["mode"]: del origin['authentication']['radius']['server']['port'] if not origin["authentication"]['radius']['server']: raise ConfigError( 'Openconnect authentication mode radius required at least one radius server') default_values_radius_port = \ default_values['authentication']['radius']['server']['port'] for server, params in origin['authentication']['radius'][ 'server'].items(): if 'port' not in params: params['port'] = default_values_radius_port if 'mode' in origin["accounting"] and "radius" in \ origin["accounting"]["mode"]: del origin['accounting']['radius']['server']['port'] if not origin["accounting"]['radius']['server']: raise ConfigError( 'Openconnect accounting mode radius required at least one radius server') default_values_radius_port = \ default_values['accounting']['radius']['server']['port'] for server, params in origin['accounting']['radius'][ 'server'].items(): if 'port' not in params: params['port'] = default_values_radius_port return origin def get_config(): conf = Config() base = ['vpn', 'openconnect'] if not conf.exists(base): return None ocserv = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=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) ocserv = dict_merge(default_values, ocserv) # workaround a "know limitation" - https://vyos.dev/T2665 ocserv = T2665_default_dict_cleanup(ocserv, default_values) if ocserv: ocserv['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True) return ocserv def verify(ocserv): if ocserv is None: return None # Check if listen-ports not binded other services # It can be only listen by 'ocserv-main' for proto, port in ocserv.get('listen_ports').items(): if check_port_availability(ocserv['listen_address'], int(port), proto) is not True and \ not is_listen_port_bind_service(int(port), 'ocserv-main'): raise ConfigError(f'"{proto}" port "{port}" is used by another service') # Check accounting if "accounting" in ocserv: if "mode" in ocserv["accounting"] and "radius" in ocserv["accounting"]["mode"]: if "authentication" not in ocserv or "mode" not in ocserv["authentication"]: raise ConfigError('Accounting depends on OpenConnect authentication configuration') elif "radius" not in ocserv["authentication"]["mode"]: raise ConfigError('RADIUS accounting must be used with RADIUS authentication') # Check authentication if "authentication" in ocserv: if "mode" in ocserv["authentication"]: if "local" in ocserv["authentication"]["mode"]: if "radius" in ocserv["authentication"]["mode"]: raise ConfigError('OpenConnect authentication modes are mutually-exclusive, remove either local or radius from your configuration') if not ocserv["authentication"]["local_users"]: raise ConfigError('openconnect mode local required at least one user') if not ocserv["authentication"]["local_users"]["username"]: raise ConfigError('openconnect mode local required at least one user') else: # For OTP mode: verify that each local user has an OTP key if "otp" in ocserv["authentication"]["mode"]["local"]: users_wo_key = [] for user, user_config in ocserv["authentication"]["local_users"]["username"].items(): # User has no OTP key defined if dict_search('otp.key', user_config) == None: users_wo_key.append(user) if users_wo_key: raise ConfigError(f'OTP enabled, but no OTP key is configured for these users:\n{users_wo_key}') # For password (and default) mode: verify that each local user has password if "password" in ocserv["authentication"]["mode"]["local"] or "otp" not in ocserv["authentication"]["mode"]["local"]: users_wo_pswd = [] for user in ocserv["authentication"]["local_users"]["username"]: if not "password" in ocserv["authentication"]["local_users"]["username"][user]: users_wo_pswd.append(user) if users_wo_pswd: raise ConfigError(f'password required for users:\n{users_wo_pswd}') else: raise ConfigError('openconnect authentication mode required') else: raise ConfigError('openconnect authentication credentials required') # Check ssl if 'ssl' not in ocserv: raise ConfigError('openconnect ssl required') if not ocserv['pki'] or 'certificate' not in ocserv['pki']: raise ConfigError('PKI not configured') ssl = ocserv['ssl'] if 'certificate' not in ssl: raise ConfigError('openconnect ssl certificate required') cert_name = ssl['certificate'] if cert_name not in ocserv['pki']['certificate']: raise ConfigError('Invalid openconnect ssl certificate') cert = ocserv['pki']['certificate'][cert_name] if 'certificate' not in cert: raise ConfigError('Missing certificate in PKI') if 'private' not in cert or 'key' not in cert['private']: raise ConfigError('Missing private key in PKI') if 'ca_certificate' in ssl: if 'ca' not in ocserv['pki']: raise ConfigError('PKI not configured') if ssl['ca_certificate'] not in ocserv['pki']['ca']: raise ConfigError('Invalid openconnect ssl CA certificate') # Check network settings if "network_settings" in ocserv: if "push_route" in ocserv["network_settings"]: # Replace default route if "0.0.0.0/0" in ocserv["network_settings"]["push_route"]: ocserv["network_settings"]["push_route"].remove("0.0.0.0/0") ocserv["network_settings"]["push_route"].append("default") else: ocserv["network_settings"]["push_route"] = ["default"] else: raise ConfigError('openconnect network settings required') def generate(ocserv): if not ocserv: return None if "radius" in ocserv["authentication"]["mode"]: if dict_search(ocserv, 'accounting.mode.radius'): # Render radius client configuration render(radius_cfg, 'ocserv/radius_conf.j2', ocserv) merged_servers = ocserv["accounting"]["radius"]["server"] | ocserv["authentication"]["radius"]["server"] # Render radius servers # Merge the accounting and authentication servers into a single dictionary render(radius_servers, 'ocserv/radius_servers.j2', {'server': merged_servers}) else: # Render radius client configuration render(radius_cfg, 'ocserv/radius_conf.j2', ocserv) # Render radius servers render(radius_servers, 'ocserv/radius_servers.j2', ocserv["authentication"]["radius"]) elif "local" in ocserv["authentication"]["mode"]: # if mode "OTP", generate OTP users file parameters if "otp" in ocserv["authentication"]["mode"]["local"]: if "local_users" in ocserv["authentication"]: for user in ocserv["authentication"]["local_users"]["username"]: # OTP token type from CLI parameters: otp_interval = str(ocserv["authentication"]["local_users"]["username"][user]["otp"].get("interval")) token_type = ocserv["authentication"]["local_users"]["username"][user]["otp"].get("token_type") otp_length = str(ocserv["authentication"]["local_users"]["username"][user]["otp"].get("otp_length")) if token_type == "hotp-time": otp_type = "HOTP/T" + otp_interval elif token_type == "hotp-event": otp_type = "HOTP/E" else: otp_type = "HOTP/T" + otp_interval ocserv["authentication"]["local_users"]["username"][user]["otp"]["token_tmpl"] = otp_type + "/" + otp_length # if there is a password, generate hash if "password" in ocserv["authentication"]["mode"]["local"] or not "otp" in ocserv["authentication"]["mode"]["local"]: if "local_users" in ocserv["authentication"]: for user in ocserv["authentication"]["local_users"]["username"]: ocserv["authentication"]["local_users"]["username"][user]["hash"] = get_hash(ocserv["authentication"]["local_users"]["username"][user]["password"]) if "password-otp" in ocserv["authentication"]["mode"]["local"]: # Render local users ocpasswd render(ocserv_passwd, 'ocserv/ocserv_passwd.j2', ocserv["authentication"]["local_users"]) # Render local users OTP keys render(ocserv_otp_usr, 'ocserv/ocserv_otp_usr.j2', ocserv["authentication"]["local_users"]) elif "password" in ocserv["authentication"]["mode"]["local"]: # Render local users ocpasswd render(ocserv_passwd, 'ocserv/ocserv_passwd.j2', ocserv["authentication"]["local_users"]) elif "otp" in ocserv["authentication"]["mode"]["local"]: # Render local users OTP keys render(ocserv_otp_usr, 'ocserv/ocserv_otp_usr.j2', ocserv["authentication"]["local_users"]) else: # Render local users ocpasswd render(ocserv_passwd, 'ocserv/ocserv_passwd.j2', ocserv["authentication"]["local_users"]) else: if "local_users" in ocserv["authentication"]: for user in ocserv["authentication"]["local_users"]["username"]: ocserv["authentication"]["local_users"]["username"][user]["hash"] = get_hash(ocserv["authentication"]["local_users"]["username"][user]["password"]) # Render local users render(ocserv_passwd, 'ocserv/ocserv_passwd.j2', ocserv["authentication"]["local_users"]) if "ssl" in ocserv: cert_file_path = os.path.join(cfg_dir, 'cert.pem') cert_key_path = os.path.join(cfg_dir, 'cert.key') ca_cert_file_path = os.path.join(cfg_dir, 'ca.pem') if 'certificate' in ocserv['ssl']: cert_name = ocserv['ssl']['certificate'] pki_cert = ocserv['pki']['certificate'][cert_name] with open(cert_file_path, 'w') as f: f.write(wrap_certificate(pki_cert['certificate'])) if 'private' in pki_cert and 'key' in pki_cert['private']: with open(cert_key_path, 'w') as f: f.write(wrap_private_key(pki_cert['private']['key'])) if 'ca_certificate' in ocserv['ssl']: ca_name = ocserv['ssl']['ca_certificate'] pki_ca_cert = ocserv['pki']['ca'][ca_name] with open(ca_cert_file_path, 'w') as f: f.write(wrap_certificate(pki_ca_cert['certificate'])) # Render config render(ocserv_conf, 'ocserv/ocserv_config.j2', ocserv) def apply(ocserv): if not ocserv: call('systemctl stop ocserv.service') for file in [ocserv_conf, ocserv_passwd, ocserv_otp_usr]: if os.path.exists(file): os.unlink(file) else: call('systemctl reload-or-restart ocserv.service') counter = 0 while True: # exit early when service runs if is_systemd_service_running("ocserv.service"): break sleep(0.250) if counter > 5: raise ConfigError('openconnect failed to start, check the logs for details') break counter += 1 if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)