зеркало из https://github.com/mozilla/MozDef.git
75 строки
2.5 KiB
Python
75 строки
2.5 KiB
Python
#!/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) 2017 Mozilla Corporation
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#
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# Contributors:
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# Aaron Meihm <ameihm@mozilla.com>
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# Brandon Myers bmyers@mozilla.com
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from lib.alerttask import AlertTask
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from query_models import SearchQuery, TermMatch, PhraseMatch, QueryStringMatch
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import re
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import json
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class AlertAuthSignRelengSSH(AlertTask):
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def main(self):
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search_query = SearchQuery(minutes=15)
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self.parse_config('ssh_access_signreleng.conf', ['hostfilter', 'ircchannel', 'exclusions'])
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if self.config.ircchannel == '':
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self.config.ircchannel = None
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exclusions = json.loads(self.config.exclusions)
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search_query.add_must([
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TermMatch('tags', 'releng'),
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TermMatch('details.program', 'sshd'),
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QueryStringMatch('details.hostname: /{}/'.format(self.config.hostfilter)),
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PhraseMatch('summary', 'Accepted publickey for ')
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])
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for exclusion in exclusions:
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exclusion_query = None
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for key, value in exclusion.iteritems():
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phrase_exclusion = PhraseMatch(key, value)
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if exclusion_query is None:
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exclusion_query = phrase_exclusion
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else:
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exclusion_query = exclusion_query + phrase_exclusion
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search_query.add_must_not(exclusion_query)
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self.filtersManual(search_query)
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self.searchEventsSimple()
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self.walkEvents()
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# Set alert properties
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def onEvent(self, event):
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category = 'access'
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tags = ['ssh']
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severity = 'NOTICE'
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targethost = 'unknown'
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sourceipaddress = 'unknown'
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x = event['_source']
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if 'details' in x:
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if 'hostname' in x['details']:
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targethost = x['details']['hostname']
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if 'sourceipaddress' in x['details']:
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sourceipaddress = x['details']['sourceipaddress']
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targetuser = 'unknown'
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expr = re.compile('Accepted publickey for ([A-Za-z0-9]+) from')
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m = expr.match(event['_source']['summary'])
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groups = m.groups()
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if len(groups) > 0:
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targetuser = groups[0]
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summary = 'SSH login from {0} on {1} as user {2}'.format(sourceipaddress, targethost, targetuser)
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return self.createAlertDict(summary, category, tags, [event], severity, ircchannel=self.config.ircchannel)
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