From c9eaafd9f808aba8d29be73054e11d37577e539a Mon Sep 17 00:00:00 2001
From: Christian Breunig <christian@breunig.cc>
Date: Sat, 30 Dec 2023 23:25:20 +0100
Subject: T5474: establish common file name pattern for XML conf mode commands

We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.

Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in

(cherry picked from commit 4ef110fd2c501b718344c72d495ad7e16d2bd465)
---
 src/conf_mode/service_ids_ddos-protection.py | 104 +++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100755 src/conf_mode/service_ids_ddos-protection.py

(limited to 'src/conf_mode/service_ids_ddos-protection.py')

diff --git a/src/conf_mode/service_ids_ddos-protection.py b/src/conf_mode/service_ids_ddos-protection.py
new file mode 100755
index 000000000..276a71fcb
--- /dev/null
+++ b/src/conf_mode/service_ids_ddos-protection.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2023 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 vyos.config import Config
+from vyos.template import render
+from vyos.utils.process import call
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/run/fastnetmon/fastnetmon.conf'
+networks_list = r'/run/fastnetmon/networks_list'
+excluded_networks_list = r'/run/fastnetmon/excluded_networks_list'
+attack_dir = '/var/log/fastnetmon_attacks'
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['service', 'ids', 'ddos-protection']
+    if not conf.exists(base):
+        return None
+
+    fastnetmon = conf.get_config_dict(base, key_mangling=('-', '_'),
+                                      get_first_key=True,
+                                      with_recursive_defaults=True)
+
+    return fastnetmon
+
+def verify(fastnetmon):
+    if not fastnetmon:
+        return None
+
+    if 'mode' not in fastnetmon:
+        raise ConfigError('Specify operating mode!')
+
+    if fastnetmon.get('mode') == 'mirror' and 'listen_interface' not in fastnetmon:
+        raise ConfigError("Incorrect settings for 'mode mirror': must specify interface(s) for traffic mirroring")
+
+    if fastnetmon.get('mode') == 'sflow' and 'listen_address' not in fastnetmon.get('sflow', {}):
+        raise ConfigError("Incorrect settings for 'mode sflow': must specify sFlow 'listen-address'")
+
+    if 'alert_script' in fastnetmon:
+        if os.path.isfile(fastnetmon['alert_script']):
+            # Check script permissions
+            if not os.access(fastnetmon['alert_script'], os.X_OK):
+                raise ConfigError('Script "{alert_script}" is not executable!'.format(fastnetmon['alert_script']))
+        else:
+           raise ConfigError('File "{alert_script}" does not exists!'.format(fastnetmon))
+
+def generate(fastnetmon):
+    if not fastnetmon:
+        for file in [config_file, networks_list]:
+            if os.path.isfile(file):
+                os.unlink(file)
+
+        return None
+
+    # Create dir for log attack details
+    if not os.path.exists(attack_dir):
+        os.mkdir(attack_dir)
+
+    render(config_file, 'ids/fastnetmon.j2', fastnetmon)
+    render(networks_list, 'ids/fastnetmon_networks_list.j2', fastnetmon)
+    render(excluded_networks_list, 'ids/fastnetmon_excluded_networks_list.j2', fastnetmon)
+    return None
+
+def apply(fastnetmon):
+    systemd_service = 'fastnetmon.service'
+    if not fastnetmon:
+        # Stop fastnetmon service if removed
+        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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