haproxy: T6745: Rename `reverse-proxy` to `haproxy`

1 files changed, 206 insertions, 0 deletions

diff --git a/src/conf_mode/load-balancing_haproxy.py b/src/conf_mode/load-balancing_haproxy.py
new file mode 100644
index 000000000..45042dd52
--- /dev/null
+++ b/src/conf_mode/load-balancing_haproxy.py
@@ -0,0 +1,206 @@
+#!/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 <http://www.gnu.org/licenses/>.
+
+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)