зеркало из https://github.com/mozilla/MozDef.git
50 строки
2.1 KiB
Python
50 строки
2.1 KiB
Python
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#!/usr/bin/env python
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Copyright (c) 2014 Mozilla Corporation
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#
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# Contributors:
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# kang@mozilla.com
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#
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# This script alerts when openvpn's duo security failed to contact the duo server and let the user in.
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# This is a very serious warning that must be acted upon as it means MFA failed and only one factor was validated (in
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# this case a VPN certificate)
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from lib.alerttask import AlertTask
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import pyes
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class AlertDuoFailOpen(AlertTask):
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def main(self):
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# look for events in last 15 mins
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date_timedelta = dict(minutes=15)
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# Configure filters using pyes
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must = [
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pyes.TermFilter('_type', 'event'),
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pyes.TermFilter('_source.tags', 'openvpn,duosecurity'),
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pyes.QueryFilter(pyes.MatchQuery('summary','DuoAPI contact failed','phrase')),
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pyes.QueryFilter(pyes.MatchQuery('summary','DuoAPI contact failed','phrase')),
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]
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self.filtersManual(date_timedelta, must=must)
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# Search aggregations on field 'sourceipaddress', keep 50 samples of events at most
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self.searchEventsAggreg('hostname', samplesLimit=1)
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# alert when >= X matching events in an aggregation
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# in this case, always
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self.walkAggregations(threshold=1)
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# Set alert properties
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def onAggreg(self, aggreg):
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# aggreg['count']: number of items in the aggregation, ex: number of failed login attempts
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# aggreg['value']: value of the aggregation field, ex: toto@example.com
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# aggreg['events']: list of events in the aggregation
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category = 'bypass'
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tags = ['openvpn', 'duosecurity']
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severity = 'WARNING'
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summary = ('DuoSecurity OpenVPN contact failed, fail open triggered on {0}'.aggreg['value']))
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# Create the alert object based on these properties
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return self.createAlertDict(summary, category, tags, aggreg['events'], severity)
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