зеркало из https://github.com/mozilla/MozDef.git
678 строки
26 KiB
Python
Executable File
678 строки
26 KiB
Python
Executable File
#!/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) 2015 Mozilla Corporation
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#
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# Contributors:
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# Aaron Meihm ameihm@mozilla.com
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# Reads from papertrail using the API and inserts log data into ES in
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# the same manner as esworker.py
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import json
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import math
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import os
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import pyes
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import pytz
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import pynsive
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import re
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import sys
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import socket
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import time
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import urllib
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from configlib import getConfig, OptionParser
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from datetime import datetime, timedelta
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from dateutil.parser import parse
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import calendar
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from operator import itemgetter
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import base64
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import requests
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from threading import Timer
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# running under uwsgi?
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try:
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import uwsgi
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hasUWSGI = True
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except ImportError as e:
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hasUWSGI = False
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class PTRequestor(object):
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def __init__(self, apikey, evmax=2000):
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self._papertrail_api = 'https://papertrailapp.com/api/v1/events/search.json'
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self._apikey = apikey
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self._events = {}
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self._evmax = evmax
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self._evidcache = []
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def parse_events(self, resp):
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for x in resp['events']:
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if x['id'] in self._evidcache:
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# saw this event last time, just ignore it
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continue
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self._events[x['id']] = x
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if 'reached_record_limit' in resp.keys() and resp['reached_record_limit']:
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return resp['min_id']
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return None
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def makerequest(self, query, stime, etime, maxid):
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payload = {
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'min_time': calendar.timegm(stime.utctimetuple()),
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'max_time': calendar.timegm(etime.utctimetuple()),
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'q': query
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}
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if maxid != None:
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payload['max_id'] = maxid
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hdrs = {'X-Papertrail-Token': self._apikey}
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resp = requests.get(self._papertrail_api, headers=hdrs, params=payload)
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return self.parse_events(resp.json())
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def request(self, query, stime, etime):
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self._events = {}
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maxid = None
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while True:
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maxid = self.makerequest(query, stime, etime, maxid)
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if maxid == None:
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break
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if len(self._events.keys()) > self._evmax:
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sys.stderr.write('WARNING: papertrail esworker hitting event request limit\n')
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break
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# cache event ids we return to allow for some duplicate filtering checks
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# during next run
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self._evidcache = self._events.keys()
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return self._events
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def isNumber(s):
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'check if a token is numeric, return bool'
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try:
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float(s) # for int, long and float
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except ValueError:
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try:
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complex(s) # for complex
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except ValueError:
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return False
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return True
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def digits(n):
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'''return the number of digits in a number'''
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if n > 0:
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digits = int(math.log10(n))+1
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elif n == 0:
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digits = 1
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else:
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digits = int(math.log10(-n))+2
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return digits
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def toUTC(suspectedDate, localTimeZone=None):
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'''make a UTC date out of almost anything'''
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utc = pytz.UTC
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objDate = None
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if localTimeZone is None:
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localTimeZone = options.defaultTimeZone
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if type(suspectedDate) == datetime:
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objDate = suspectedDate
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elif isNumber(suspectedDate):
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# epoch? but seconds/milliseconds/nanoseconds (lookin at you heka)
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epochDivisor = int(str(1) + '0'*(digits(suspectedDate) % 10))
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objDate = datetime.fromtimestamp(float(suspectedDate/epochDivisor))
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elif type(suspectedDate) in (str, unicode):
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objDate = parse(suspectedDate, fuzzy=True)
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if objDate.tzinfo is None:
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objDate = pytz.timezone(localTimeZone).localize(objDate)
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objDate = utc.normalize(objDate)
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else:
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objDate = utc.normalize(objDate)
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if objDate is not None:
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objDate = utc.normalize(objDate)
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return objDate.isoformat()
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def removeDictAt(aDict):
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'''remove the @ symbol from any field/key names'''
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returndict = dict()
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for k, v in aDict.iteritems():
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k = k.replace('@', '')
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returndict[k] = v
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return returndict
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def removeAt(astring):
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'''remove the leading @ from a string'''
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return astring.replace('@', '')
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def isCEF(aDict):
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# determine if this is a CEF event
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# could be an event posted to the /cef http endpoint
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if 'endpoint' in aDict.keys() and aDict['endpoint'] == 'cef':
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return True
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# maybe it snuck in some other way
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# check some key CEF indicators (the header fields)
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if 'fields' in aDict.keys() and isinstance(aDict['fields'], dict):
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lowerKeys = [s.lower() for s in aDict['fields'].keys()]
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if 'devicevendor' in lowerKeys and 'deviceproduct' in lowerKeys and 'deviceversion' in lowerKeys:
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return True
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if 'details' in aDict.keys() and isinstance(aDict['details'], dict):
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lowerKeys = [s.lower() for s in aDict['details'].keys()]
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if 'devicevendor' in lowerKeys and 'deviceproduct' in lowerKeys and 'deviceversion' in lowerKeys:
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return True
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return False
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def safeString(aString):
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'''return a safe string given a potentially unsafe, unicode, etc'''
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returnString = ''
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if isinstance(aString, str):
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returnString = aString
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if isinstance(aString, unicode):
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returnString = aString.encode('ascii', 'ignore')
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return returnString
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def toUnicode(obj, encoding='utf-8'):
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if type(obj) in [int, long, float, complex]:
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# likely a number, convert it to string to get to unicode
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obj = str(obj)
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if isinstance(obj, basestring):
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if not isinstance(obj, unicode):
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obj = unicode(obj, encoding)
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return obj
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def keyMapping(aDict):
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'''map common key/fields to a normalized structure,
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explicitly typed when possible to avoid schema changes for upsteam consumers
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Special accomodations made for logstash,nxlog, beaver, heka and CEF
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Some shippers attempt to conform to logstash-style @fieldname convention.
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This strips the leading at symbol since it breaks some elastic search
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libraries like elasticutils.
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'''
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returndict = dict()
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# uncomment to save the source event for debugging, or chain of custody/forensics
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# returndict['original']=aDict
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# set the timestamp when we received it, i.e. now
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returndict['receivedtimestamp'] = toUTC(datetime.now())
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returndict['mozdefhostname'] = options.mozdefhostname
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try:
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for k, v in aDict.iteritems():
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k = removeAt(k).lower()
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if k in ('message', 'summary'):
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returndict[u'summary'] = toUnicode(v)
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if k in ('payload') and 'summary' not in aDict.keys():
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# special case for heka if it sends payload as well as a summary, keep both but move payload to the details section.
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returndict[u'summary'] = toUnicode(v)
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elif k in ('payload'):
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if 'details' not in returndict.keys():
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returndict[u'details'] = dict()
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returndict[u'details']['payload'] = toUnicode(v)
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if k in ('eventtime', 'timestamp', 'utctimestamp'):
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returndict[u'utctimestamp'] = toUTC(v)
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returndict[u'timestamp'] = toUTC(v)
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if k in ('hostname', 'source_host', 'host'):
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returndict[u'hostname'] = toUnicode(v)
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if k in ('tags'):
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if len(v) > 0:
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returndict[u'tags'] = v
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# nxlog keeps the severity name in syslogseverity,everyone else should use severity or level.
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if k in ('syslogseverity', 'severity', 'severityvalue', 'level'):
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returndict[u'severity'] = toUnicode(v).upper()
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if k in ('facility', 'syslogfacility'):
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returndict[u'facility'] = toUnicode(v)
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if k in ('pid', 'processid'):
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returndict[u'processid'] = toUnicode(v)
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# nxlog sets sourcename to the processname (i.e. sshd), everyone else should call it process name or pname
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if k in ('pname', 'processname', 'sourcename'):
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returndict[u'processname'] = toUnicode(v)
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# the file, or source
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if k in ('path', 'logger', 'file'):
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returndict[u'eventsource'] = toUnicode(v)
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if k in ('type', 'eventtype', 'category'):
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returndict[u'category'] = toUnicode(v)
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# custom fields as a list/array
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if k in ('fields', 'details'):
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if len(v) > 0:
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returndict[u'details'] = v
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# custom fields/details as a one off, not in an array
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# i.e. fields.something=value or details.something=value
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# move them to a dict for consistency in querying
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if k.startswith('fields.') or k.startswith('details.'):
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newName = k.replace('fields.', '')
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newName = newName.lower().replace('details.', '')
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# add a dict to hold the details if it doesn't exist
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if 'details' not in returndict.keys():
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returndict[u'details'] = dict()
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# add field with a special case for shippers that
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# don't send details
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# in an array as int/floats/strings
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# we let them dictate the data type with field_datatype
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# convention
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if newName.endswith('_int'):
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returndict[u'details'][unicode(newName)] = int(v)
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elif newName.endswith('_float'):
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returndict[u'details'][unicode(newName)] = float(v)
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else:
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returndict[u'details'][unicode(newName)] = toUnicode(v)
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#nxlog windows log handling
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if 'Domain' in aDict.keys() and 'SourceModuleType' in aDict.keys():
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# add a dict to hold the details if it doesn't exist
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if 'details' not in returndict.keys():
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returndict[u'details'] = dict()
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# nxlog parses all windows event fields very well
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# copy all fields to details
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returndict[u'details'][k]=v
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if 'utctimestamp' not in returndict.keys():
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# default in case we don't find a reasonable timestamp
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returndict['utctimestamp'] = toUTC(datetime.now())
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except Exception as e:
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sys.stderr.write('esworker exception normalizing the message %r\n' % e)
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return None
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return returndict
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def esConnect(conn):
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'''open or re-open a connection to elastic search'''
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return pyes.ES(server=(list('{0}'.format(s) for s in options.esservers)), bulk_size=options.esbulksize)
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class taskConsumer(object):
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def __init__(self, ptRequestor, esConnection):
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self.ptrequestor = ptRequestor
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self.esConnection = esConnection
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# calculate our initial request window
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self.lastRequestTime = datetime.now(pytz.utc) - timedelta(seconds=options.ptinterval) - \
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timedelta(seconds=options.ptbackoff)
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if options.esbulksize != 0:
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# if we are bulk posting enable a timer to occasionally flush the pyes bulker even if it's not full
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# to prevent events from sticking around an idle worker
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Timer(options.esbulktimeout, self.flush_es_bulk).start()
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def run(self):
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while True:
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try:
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curRequestTime = datetime.now(pytz.utc) - timedelta(seconds=options.ptbackoff)
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records = self.ptrequestor.request(options.ptquery, self.lastRequestTime, curRequestTime)
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# update last request time for the next request
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self.lastRequestTime = curRequestTime
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for msgid in records:
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msgdict = records[msgid]
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# strip any line feeds from the message itself, we just convert them
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# into spaces
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msgdict['message'] = msgdict['message'].replace('\n', ' ').replace('\r', '')
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event = dict()
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event['tags'] = ['papertrail', options.ptacctname]
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event['details'] = msgdict
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if event['details'].has_key('generated_at'):
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event['utctimestamp'] = toUTC(event['details']['generated_at'])
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if event['details'].has_key('hostname'):
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event['hostname'] = event['details']['hostname']
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if event['details'].has_key('message'):
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event['summary'] = event['details']['message']
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if event['details'].has_key('severity'):
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event['severity'] = event['details']['severity']
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else:
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event['severity'] = 'INFO'
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event['category'] = 'syslog'
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#process message
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self.on_message(event, msgdict)
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time.sleep(options.ptinterval)
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except KeyboardInterrupt:
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sys.exit(1)
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except ValueError as e:
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sys.stdout.write('Exception while handling message: %r'%e)
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sys.exit(1)
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def flush_es_bulk(self):
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'''if we are bulk posting to elastic search force a bulk post even if we don't have
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enough items to trigger a post normally.
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This allows you to have lots of workers and not wait for events for too long if
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there isn't a steady event stream while still retaining the throughput capacity
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that bulk processing affords.
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'''
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# sys.stderr.write('mule {0} flushing bulk elastic search posts\n'.format(self.muleid))
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self.esConnection.flush_bulk(True)
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Timer(options.esbulktimeout, self.flush_es_bulk).start()
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def on_message(self, body, message):
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#print("RECEIVED MESSAGE: %r" % (body, ))
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try:
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# default elastic search metadata for an event
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metadata = {
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'index': 'events',
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'doc_type': 'event',
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'id': None
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}
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# just to be safe..check what we were sent.
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if isinstance(body, dict):
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bodyDict = body
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elif isinstance(body, str) or isinstance(body, unicode):
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try:
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bodyDict = json.loads(body) # lets assume it's json
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except ValueError as e:
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# not json..ack but log the message
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sys.stderr.write("esworker exception: unknown body type received %r\n" % body)
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#message.ack()
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return
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else:
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sys.stderr.write("esworker exception: unknown body type received %r\n" % body)
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#message.ack()
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return
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if 'customendpoint' in bodyDict.keys() and bodyDict['customendpoint']:
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# custom document
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# send to plugins to allow them to modify it if needed
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(normalizedDict, metadata) = sendEventToPlugins(bodyDict, metadata, pluginList)
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else:
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# normalize the dict
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# to the mozdef events standard
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normalizedDict = keyMapping(bodyDict)
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# send to plugins to allow them to modify it if needed
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if normalizedDict is not None and isinstance(normalizedDict, dict) and normalizedDict.keys():
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(normalizedDict, metadata) = sendEventToPlugins(normalizedDict, metadata, pluginList)
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# drop the message if a plug in set it to None
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# signaling a discard
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if normalizedDict is None:
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#message.ack()
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return
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# make a json version for posting to elastic search
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jbody = json.JSONEncoder().encode(normalizedDict)
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if isCEF(normalizedDict):
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# cef records are set to the 'deviceproduct' field value.
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metadata['doc_type'] = 'cef'
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if 'details' in normalizedDict.keys() and 'deviceproduct' in normalizedDict['details'].keys():
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# don't create strange doc types..
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if ' ' not in normalizedDict['details']['deviceproduct'] and '.' not in normalizedDict['details']['deviceproduct']:
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metadata['doc_type'] = normalizedDict['details']['deviceproduct']
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try:
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if options.esbulksize != 0:
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res = self.esConnection.index(
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index=metadata['index'],
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id=metadata['id'],
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doc_type=metadata['doc_type'],
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doc=jbody,
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bulk=True
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)
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else:
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res = self.esConnection.index(
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index=metadata['index'],
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id=metadata['id'],
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doc_type=metadata['doc_type'],
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doc=jbody,
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bulk=False
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)
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except (pyes.exceptions.NoServerAvailable, pyes.exceptions.InvalidIndexNameException) as e:
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# handle loss of server or race condition with index rotation/creation/aliasing
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try:
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self.esConnection = esConnect(None)
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#message.requeue()
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return
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except kombu.exceptions.MessageStateError:
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# state may be already set.
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return
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except pyes.exceptions.ElasticSearchException as e:
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# exception target for queue capacity issues reported by elastic search so catch the error, report it and retry the message
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try:
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sys.stderr.write('ElasticSearchException: {0} reported while indexing event'.format(e))
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#message.requeue()
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return
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except kombu.exceptions.MessageStateError:
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# state may be already set.
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return
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#message.ack()
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except ValueError as e:
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sys.stderr.write("esworker exception in events queue %r\n" % e)
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def registerPlugins():
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pluginList = list() # tuple of module,registration dict,priority
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plugin_manager = pynsive.PluginManager()
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if os.path.exists('plugins'):
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modules = pynsive.list_modules('plugins')
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for mname in modules:
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module = pynsive.import_module(mname)
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reload(module)
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if not module:
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raise ImportError('Unable to load module {}'.format(mname))
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else:
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if 'message' in dir(module):
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mclass = module.message()
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mreg = mclass.registration
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if 'priority' in dir(mclass):
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mpriority = mclass.priority
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else:
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mpriority = 100
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if isinstance(mreg, list):
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print('[*] plugin {0} registered to receive messages with {1}'.format(mname, mreg))
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pluginList.append((mclass, mreg, mpriority))
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return pluginList
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def checkPlugins(pluginList, lastPluginCheck):
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if abs(datetime.now() - lastPluginCheck).seconds > options.plugincheckfrequency:
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# print('[*] checking plugins')
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lastPluginCheck = datetime.now()
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pluginList = registerPlugins()
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return pluginList, lastPluginCheck
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else:
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return pluginList, lastPluginCheck
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|
|
|
|
def flattenDict(inDict, pre=None, values=True):
|
|
'''given a dictionary, potentially with multiple sub dictionaries
|
|
return a period delimited version of the dict with or without values
|
|
i.e. {'something':'value'} becomes something=value
|
|
{'something':{'else':'value'}} becomes something.else=value
|
|
'''
|
|
pre = pre[:] if pre else []
|
|
if isinstance(inDict, dict):
|
|
for key, value in inDict.iteritems():
|
|
if isinstance(value, dict):
|
|
for d in flattenDict(value, pre + [key], values):
|
|
yield d
|
|
else:
|
|
if pre:
|
|
if values:
|
|
if isinstance(value, str):
|
|
yield '.'.join(pre) + '.' + key + '=' + str(value)
|
|
elif isinstance(value, unicode):
|
|
yield '.'.join(pre) + '.' + key + '=' + value.encode('ascii', 'ignore')
|
|
elif value is None:
|
|
yield '.'.join(pre) + '.' + key + '=None'
|
|
else:
|
|
yield '.'.join(pre) + '.' + key
|
|
else:
|
|
if values:
|
|
if isinstance(value, str):
|
|
yield key + '=' + str(value)
|
|
elif isinstance(value, unicode):
|
|
yield key + '=' + value.encode('ascii', 'ignore')
|
|
elif value is None:
|
|
yield key + '=None'
|
|
else:
|
|
yield key
|
|
else:
|
|
yield '-'.join(pre) + '.' + inDict
|
|
|
|
|
|
def dict2List(inObj):
|
|
'''given a dictionary, potentially with multiple sub dictionaries
|
|
return a list of the dict keys and values
|
|
'''
|
|
if isinstance(inObj, dict):
|
|
for key, value in inObj.iteritems():
|
|
if isinstance(value, dict):
|
|
for d in dict2List(value):
|
|
yield d
|
|
elif isinstance(value, list):
|
|
yield key.encode('ascii', 'ignore').lower()
|
|
for l in dict2List(value):
|
|
yield l
|
|
else:
|
|
yield key.encode('ascii', 'ignore').lower()
|
|
if isinstance(value, str):
|
|
yield value.lower()
|
|
elif isinstance(value, unicode):
|
|
yield value.encode('ascii', 'ignore').lower()
|
|
else:
|
|
yield value
|
|
elif isinstance(inObj, list):
|
|
for v in inObj:
|
|
if isinstance(v, str):
|
|
yield v.lower()
|
|
elif isinstance(v, unicode):
|
|
yield v.encode('ascii', 'ignore').lower()
|
|
elif isinstance(v, list):
|
|
for l in dict2List(v):
|
|
yield l
|
|
elif isinstance(v,dict):
|
|
for d in dict2List(v):
|
|
yield d
|
|
else:
|
|
yield v
|
|
else:
|
|
yield ''
|
|
|
|
|
|
def sendEventToPlugins(anevent, metadata, pluginList):
|
|
'''compare the event to the plugin registrations.
|
|
plugins register with a list of keys or values
|
|
or values they want to match on
|
|
this function compares that registration list
|
|
to the current event and sends the event to plugins
|
|
in order
|
|
'''
|
|
if not isinstance(anevent, dict):
|
|
raise TypeError('event is type {0}, should be a dict'.format(type(anevent)))
|
|
|
|
# expecting tuple of module,criteria,priority in pluginList
|
|
# sort the plugin list by priority
|
|
for plugin in sorted(pluginList, key=itemgetter(2), reverse=False):
|
|
# assume we don't run this event through the plugin
|
|
send = False
|
|
if isinstance(plugin[1], list):
|
|
try:
|
|
if (set(plugin[1]).intersection([e for e in dict2List(anevent)])):
|
|
send = True
|
|
except TypeError:
|
|
sys.stderr.write('TypeError on set intersection for dict {0}'.format(anevent))
|
|
return (anevent, metadata)
|
|
if send:
|
|
(anevent, metadata) = plugin[0].onMessage(anevent, metadata)
|
|
if anevent is None:
|
|
# plug-in is signalling to drop this message
|
|
# early exit
|
|
return (anevent, metadata)
|
|
|
|
return (anevent, metadata)
|
|
|
|
|
|
def main():
|
|
if hasUWSGI:
|
|
sys.stdout.write("started as uwsgi mule {0}\n".format(uwsgi.mule_id()))
|
|
else:
|
|
sys.stdout.write('started without uwsgi\n')
|
|
|
|
# establish api interface with papertrail
|
|
ptRequestor = PTRequestor(options.ptapikey, evmax=options.ptquerymax)
|
|
|
|
# consume our queue
|
|
taskConsumer(ptRequestor, es).run()
|
|
|
|
|
|
|
|
def initConfig():
|
|
# change this to your default zone for when it's not specified
|
|
options.defaultTimeZone = getConfig('defaulttimezone', 'US/Pacific', options.configfile)
|
|
|
|
#capture the hostname
|
|
options.mozdefhostname = getConfig('mozdefhostname', socket.gethostname(), options.configfile)
|
|
|
|
# elastic search options. set esbulksize to a non-zero value to enable bulk posting, set timeout to post no matter how many events after X seconds.
|
|
options.esservers = list(getConfig('esservers', 'http://localhost:9200', options.configfile).split(','))
|
|
options.esbulksize = getConfig('esbulksize', 0, options.configfile)
|
|
options.esbulktimeout = getConfig('esbulktimeout', 30, options.configfile)
|
|
|
|
# papertrail configuration
|
|
options.ptapikey = getConfig('papertrailapikey', 'none', options.configfile)
|
|
options.ptquery = getConfig('papertrailquery', '', options.configfile)
|
|
options.ptinterval = getConfig('papertrailinterval', 60, options.configfile)
|
|
options.ptbackoff = getConfig('papertrailbackoff', 300, options.configfile)
|
|
options.ptacctname = getConfig('papertrailaccount', 'unset', options.configfile)
|
|
options.ptquerymax = getConfig('papertrailmaxevents', 2000, options.configfile)
|
|
|
|
# plugin options
|
|
# secs to pass before checking for new/updated plugins
|
|
# seems to cause memory leaks..
|
|
# regular updates are disabled for now,
|
|
# though we set the frequency anyway.
|
|
options.plugincheckfrequency = getConfig('plugincheckfrequency', 120, options.configfile)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
# configure ourselves
|
|
parser = OptionParser()
|
|
parser.add_option("-c", dest='configfile', default=sys.argv[0].replace('.py', '.conf'), help="configuration file to use")
|
|
(options, args) = parser.parse_args()
|
|
initConfig()
|
|
|
|
# open ES connection globally so we don't waste time opening it per message
|
|
es = esConnect(None)
|
|
|
|
# force a check for plugins and establish the plugin list
|
|
pluginList = list()
|
|
lastPluginCheck = datetime.now()-timedelta(minutes=60)
|
|
pluginList, lastPluginCheck = checkPlugins(pluginList, lastPluginCheck)
|
|
|
|
main()
|