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#!/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 <http://www.gnu.org/licenses/>.
import os
from sys import exit
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.template import render
from vyos.utils.process import call
from vyos.xml import defaults
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'
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)
# 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)
fastnetmon = dict_merge(default_values, fastnetmon)
return fastnetmon
def verify(fastnetmon):
if not fastnetmon:
return None
if 'mode' not in fastnetmon:
raise ConfigError('Specify operating mode!')
if 'listen_interface' not in fastnetmon:
raise ConfigError('Specify interface(s) for traffic capture')
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
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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