From 6d0325190fcede5b912c20cfb6ffefab90a3f4f4 Mon Sep 17 00:00:00 2001
From: Viacheslav Hletenko <v.gletenko@vyos.io>
Date: Sat, 13 May 2023 12:59:12 +0000
Subject: T5222: Add load-balancing for web traffic
---
src/conf_mode/load-balancing-haproxy.py | 182 ++++++++++++++++++++++++++++++++
1 file changed, 182 insertions(+)
create mode 100755 src/conf_mode/load-balancing-haproxy.py
(limited to 'src')
diff --git a/src/conf_mode/load-balancing-haproxy.py b/src/conf_mode/load-balancing-haproxy.py
new file mode 100755
index 000000000..d2b895fbe
--- /dev/null
+++ b/src/conf_mode/load-balancing-haproxy.py
@@ -0,0 +1,182 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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 shutil import rmtree
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.util import call
+from vyos.util import check_port_availability
+from vyos.util import is_listen_port_bind_service
+from vyos.pki import wrap_certificate
+from vyos.pki import wrap_private_key
+from vyos.template import render
+from vyos.xml import defaults
+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 = r'/run/systemd/system/haproxy.service.d/10-override.conf'
+
+
+def get_config(config=None):
+ if config:
+ conf = config
+ else:
+ conf = Config()
+
+ base = ['load-balancing', 'reverse-proxy']
+ lb = conf.get_config_dict(base,
+ get_first_key=True,
+ key_mangling=('-', '_'),
+ no_tag_node_value_mangle=True)
+
+ if lb:
+ lb['pki'] = conf.get_config_dict(['pki'], 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)
+ if 'backend' in default_values:
+ del default_values['backend']
+ if lb:
+ lb = dict_merge(default_values, lb)
+
+ if 'backend' in lb:
+ for backend in lb['backend']:
+ default_balues_backend = defaults(base + ['backend'])
+ lb['backend'][backend] = dict_merge(default_balues_backend, lb['backend'][backend])
+
+ return lb
+
+
+def verify(lb):
+ if not lb:
+ return None
+
+ if 'backend' not in lb or 'server' not in lb:
+ raise ConfigError(f'"server" and "backend" must be configured!')
+
+ for front, front_config in lb['server'].items():
+ if 'port' not in front_config:
+ raise ConfigError(f'"{front} server port" must be configured!')
+ # We can use redirect to HTTPS without backend section
+ if 'backend' not in front_config and 'redirect_http_to_https' not in front_config:
+ raise ConfigError(f'"{front} backend" 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 '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!')
+
+
+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)
+
+ # SSL Certificates for frontend
+ for front, front_config in lb['server'].items():
+ if 'ssl' in front_config:
+ cert_file_path = os.path.join(load_balancing_dir, 'cert.pem')
+ cert_key_path = os.path.join(load_balancing_dir, 'cert.pem.key')
+ ca_cert_file_path = os.path.join(load_balancing_dir, 'ca.pem')
+
+ if 'certificate' in front_config['ssl']:
+ #cert_file_path = os.path.join(load_balancing_dir, 'cert.pem')
+ #cert_key_path = os.path.join(load_balancing_dir, 'cert.key')
+ cert_name = front_config['ssl']['certificate']
+ pki_cert = lb['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 front_config['ssl']:
+ ca_name = front_config['ssl']['ca_certificate']
+ pki_ca_cert = lb['pki']['ca'][ca_name]
+
+ with open(ca_cert_file_path, 'w') as f:
+ f.write(wrap_certificate(pki_ca_cert['certificate']))
+
+ # SSL Certificates for backend
+ for back, back_config in lb['backend'].items():
+ if 'ssl' in back_config:
+ ca_cert_file_path = os.path.join(load_balancing_dir, 'ca.pem')
+
+ if 'ca_certificate' in back_config['ssl']:
+ ca_name = back_config['ssl']['ca_certificate']
+ pki_ca_cert = lb['pki']['ca'][ca_name]
+
+ with open(ca_cert_file_path, 'w') as f:
+ f.write(wrap_certificate(pki_ca_cert['certificate']))
+
+ 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)
--
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