#!/usr/bin/env python3 # # Copyright (C) 2023-2024 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 shutil import rmtree from vyos.config import Config from vyos.configverify import verify_pki_certificate from vyos.configverify import verify_pki_ca_certificate from vyos.utils.dict import dict_search from vyos.utils.process import call from vyos.utils.network import check_port_availability from vyos.utils.network import is_listen_port_bind_service from vyos.pki import find_chain from vyos.pki import load_certificate from vyos.pki import load_private_key from vyos.pki import encode_certificate from vyos.pki import encode_private_key from vyos.template import render from vyos.utils.file import write_file from vyos import ConfigError from vyos import airbag airbag.enable() load_balancing_dir = '/run/haproxy' load_balancing_conf_file = f'{load_balancing_dir}/haproxy.cfg' systemd_service = 'haproxy.service' systemd_override = '/run/systemd/system/haproxy.service.d/10-override.conf' def get_config(config=None): if config: conf = config else: conf = Config() base = ['load-balancing', 'haproxy'] if not conf.exists(base): return None lb = conf.get_config_dict(base, get_first_key=True, key_mangling=('-', '_'), no_tag_node_value_mangle=True, with_recursive_defaults=True, with_pki=True) return lb def verify(lb): if not lb: return None if 'backend' not in lb or 'service' not in lb: raise ConfigError(f'"service" and "backend" must be configured!') for front, front_config in lb['service'].items(): if 'port' not in front_config: raise ConfigError(f'"{front} service port" must be configured!') # Check if bind address:port are used by another service tmp_address = front_config.get('address', '0.0.0.0') tmp_port = front_config['port'] if check_port_availability(tmp_address, int(tmp_port), 'tcp') is not True and \ not is_listen_port_bind_service(int(tmp_port), 'haproxy'): raise ConfigError(f'"TCP" port "{tmp_port}" is used by another service') for back, back_config in lb['backend'].items(): if 'http_check' in back_config: http_check = back_config['http_check'] if 'expect' in http_check and 'status' in http_check['expect'] and 'string' in http_check['expect']: raise ConfigError(f'"expect status" and "expect string" can not be configured together!') if 'health_check' in back_config: if back_config['mode'] != 'tcp': raise ConfigError(f'backend "{back}" can only be configured with {back_config["health_check"]} ' + f'health-check whilst in TCP mode!') if 'http_check' in back_config: raise ConfigError(f'backend "{back}" cannot be configured with both http-check and health-check!') if 'server' not in back_config: raise ConfigError(f'"{back} server" must be configured!') for bk_server, bk_server_conf in back_config['server'].items(): if 'address' not in bk_server_conf or 'port' not in bk_server_conf: raise ConfigError(f'"backend {back} server {bk_server} address and port" must be configured!') if {'send_proxy', 'send_proxy_v2'} <= set(bk_server_conf): raise ConfigError(f'Cannot use both "send-proxy" and "send-proxy-v2" for server "{bk_server}"') if 'ssl' in back_config: if {'no_verify', 'ca_certificate'} <= set(back_config['ssl']): raise ConfigError(f'backend {back} cannot have both ssl options no-verify and ca-certificate set!') # Check if http-response-headers are configured in any frontend/backend where mode != http for group in ['service', 'backend']: for config_name, config in lb[group].items(): if 'http_response_headers' in config and config['mode'] != 'http': raise ConfigError(f'{group} {config_name} must be set to http mode to use http_response_headers!') for front, front_config in lb['service'].items(): for cert in dict_search('ssl.certificate', front_config) or []: verify_pki_certificate(lb, cert) for back, back_config in lb['backend'].items(): tmp = dict_search('ssl.ca_certificate', back_config) if tmp: verify_pki_ca_certificate(lb, tmp) def generate(lb): if not lb: # Delete /run/haproxy/haproxy.cfg config_files = [load_balancing_conf_file, systemd_override] for file in config_files: if os.path.isfile(file): os.unlink(file) # Delete old directories if os.path.isdir(load_balancing_dir): rmtree(load_balancing_dir, ignore_errors=True) return None # Create load-balance dir if not os.path.isdir(load_balancing_dir): os.mkdir(load_balancing_dir) loaded_ca_certs = {load_certificate(c['certificate']) for c in lb['pki']['ca'].values()} if 'ca' in lb['pki'] else {} # SSL Certificates for frontend for front, front_config in lb['service'].items(): if 'ssl' not in front_config: continue if 'certificate' in front_config['ssl']: cert_names = front_config['ssl']['certificate'] for cert_name in cert_names: pki_cert = lb['pki']['certificate'][cert_name] cert_file_path = os.path.join(load_balancing_dir, f'{cert_name}.pem') cert_key_path = os.path.join(load_balancing_dir, f'{cert_name}.pem.key') loaded_pki_cert = load_certificate(pki_cert['certificate']) cert_full_chain = find_chain(loaded_pki_cert, loaded_ca_certs) write_file(cert_file_path, '\n'.join(encode_certificate(c) for c in cert_full_chain)) if 'private' in pki_cert and 'key' in pki_cert['private']: loaded_key = load_private_key(pki_cert['private']['key'], passphrase=None, wrap_tags=True) key_pem = encode_private_key(loaded_key, passphrase=None) write_file(cert_key_path, key_pem) # SSL Certificates for backend for back, back_config in lb['backend'].items(): if 'ssl' not in back_config: continue if 'ca_certificate' in back_config['ssl']: ca_name = back_config['ssl']['ca_certificate'] ca_cert_file_path = os.path.join(load_balancing_dir, f'{ca_name}.pem') ca_chains = [] pki_ca_cert = lb['pki']['ca'][ca_name] loaded_ca_cert = load_certificate(pki_ca_cert['certificate']) ca_full_chain = find_chain(loaded_ca_cert, loaded_ca_certs) ca_chains.append('\n'.join(encode_certificate(c) for c in ca_full_chain)) write_file(ca_cert_file_path, '\n'.join(ca_chains)) render(load_balancing_conf_file, 'load-balancing/haproxy.cfg.j2', lb) render(systemd_override, 'load-balancing/override_haproxy.conf.j2', lb) return None def apply(lb): call('systemctl daemon-reload') if not lb: call(f'systemctl stop {systemd_service}') else: call(f'systemctl reload-or-restart {systemd_service}') return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)