MozDef/alerts/open_port_violation.py

45 строки
1.8 KiB
Python
Исходник Обычный вид История

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#!/usr/bin/env python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Copyright (c) 2017 Mozilla Corporation
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from lib.alerttask import AlertTask
from query_models import SearchQuery, TermMatch, PhraseMatch
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class AlertOpenPortViolation(AlertTask):
def main(self):
search_query = SearchQuery(hours=4)
search_query.add_must([
TermMatch('category', 'open_port_policy_violation'),
PhraseMatch('tags', 'open_port_policy_violation')
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])
self.filtersManual(search_query)
# Search aggregations on field 'sourceipaddress', keep X samples of
# events at most
self.searchEventsAggregated('details.destinationipaddress', samplesLimit=100)
# alert when >= X matching events in an aggregation
self.walkAggregations(threshold=1)
# Set alert properties
def onAggregation(self, aggreg):
# aggreg['count']: number of items in the aggregation, ex: number of failed login attempts
# aggreg['value']: value of the aggregation field, ex: toto@example.com
# aggreg['events']: list of events in the aggregation
category = 'open_port_policy_violation'
tags = ['open_port_policy_violation', 'openportpagerduty']
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severity = 'CRITICAL'
summary = ('{0} unauthorized open port(s) on {1} ('.format(aggreg['count'], aggreg['value']))
for event in aggreg['events'][:5]:
summary += str(event['_source']['details']['destinationport']) + ' '
summary += ')'
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# Create the alert object based on these properties
return self.createAlertDict(summary, category, tags, aggreg['events'], severity)