promisc_kernel.py

#!/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 https://mozilla.org/MPL/2.0/.
# Copyright (c) 2014 Mozilla Corporation
#
# This code alerts on every successfully opened session on any of the host from a given list

from lib.alerttask import AlertTask
from mozdef_util.query_models import SearchQuery, TermMatch, QueryStringMatch, PhraseMatch


class PromiscKernel(AlertTask):
    def main(self):

        search_query = SearchQuery(minutes=2)

        search_query.add_must([
            TermMatch('category', 'syslog'),
            PhraseMatch('summary', 'promiscuous'),
            PhraseMatch('summary', 'entered')
        ])

        search_query.add_must_not([
            QueryStringMatch('summary: veth*'),
        ])

        self.filtersManual(search_query)
        self.searchEventsAggregated('hostname', samplesLimit=10)
        self.walkAggregations(threshold=1)

    def onAggregation(self, aggreg):
        category = 'promisc'
        severity = 'WARNING'
        tags = ['promisc', 'kernel']

        summary = 'Promiscuous mode enabled on {1} [{0}]'.format(aggreg['count'], aggreg['value'])

        return self.createAlertDict(summary, category, tags, aggreg['events'], severity)