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check_graylog_alerts.py
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#!/usr/bin/env python
# Developer: Massoud Ahmed
import sys, socket, argparse, json, requests, urllib3, ipaddress, logging
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
from optparse import OptionParser, OptionGroup
LOGGER = logging.getLogger('check_graylog_alert')
UNKNOWN = -1
OK = 0
WARNING = 1
CRITICAL = 2
headers = {
'X-Requested-By': 'cli',
'Accept': 'application/json',
'Content-Type': 'application/json',
}
def search_graylog_for_alerts(headers, session_id, host, query, machine, timerange, crit, warn, result,proto):
base = (proto +"://" + host+ ":9000/api/events/search")
LOGGER.debug("Using "+ base+ " to search ")
data = '{"sort_direction": "desc", "timerange": { "type": "relative", "from" : "'+timerange+'"}, "query": "'+query+'", "sort_by": "timestamp"}'
searching = requests.post(base, headers=headers, data=data, verify=False, auth=(session_id, 'session'))
result = []
resultJson = searching.json()
for events in resultJson['events']:
LOGGER.debug("Found event "+ str(resultJson['events']))
extract = events['event']['fields']
keys = unpackGraylogKeys(*extract.keys())
values = unpackGraylogKeys(*extract.values())
alertExtract = "Alert "+str(events['event']['message']) + " found. Triggerd on "+str(events['event']['timestamp']) + " with values "+values+" ("+keys+") "
if machine == "all":
result.append(alertExtract)
else:
if machine in alertExtract:
LOGGER.debug("Found machine "+ machine + " in event " + str(resultJson['events']))
result.append(alertExtract)
if len(result) > 0:
if machine != "all":
resultEvaluation="CRITICAL. "+str(len(result))+ " Alert(s) found for " + machine + " : \n"+ str(("\n").join(result))
crit = 1
else:
resultEvaluation="CRITICAL. "+str(len(result))+ " Alert(s) found: \n"+ str(("\n").join(result))
crit = 1
else:
if machine != "all":
resultEvaluation="OK. No alerts found for machine "+ machine + " within last " + timerange + " seconds"
else:
resultEvaluation="OK. No alerts found within last " + timerange + " seconds"
LOGGER.debug("No alerts for "+ machine)
return resultEvaluation.replace("=",":").replace("()","").replace("|"," "),crit
def unpackGraylogKeys(*args):
return(','.join(args))
def create_session(headers, host,user,password):
# create session id for api request
base = ("https://" + host+ ":9000/api/system/sessions")
LOGGER.debug("Using "+ base+ " in order to create session id ")
proto = "https"
data = '{"username":"'+user+'", "password":"'+password+'", "host":""}'
try:
session = requests.post(base, headers=headers, data=data, verify=False)
session = session.json()
session_id = session['session_id']
LOGGER.debug("Successfully created session_id "+ str(session['session_id']))
LOGGER.debug("Valid until " + str(session['valid_until']))
except Exception as ex:
LOGGER.debug(ex)
try:
base = ("http://" + host+ ":9000/api/system/sessions")
LOGGER.debug("https did not work. Using "+ base+ " instead")
proto="http"
data = '{"username":"'+user+'", "password":"'+password+'", "host":""}'
session = requests.post(base, headers=headers, data=data)
session = session.json()
session_id = session['session_id']
LOGGER.debug("Successfully created session_id "+ str(session['session_id']))
LOGGER.debug("Valid until " + str(session['valid_until']))
except Exception as ex:
LOGGER.debug(ex)
LOGGER.debug("ERROR: Could not create session_id!")
exit(2)
return proto,session['session_id']
if __name__ == "__main__":
desc='''%prog checks graylog stream for alerts. you need to setup alerts beforehand. \n Example: %prog -H 192.168.134.11 -u admin -p secret -m testmachine -t 33 '''
parser = OptionParser(description=desc)
gen_opts = OptionGroup(parser, "Generic options")
host_opts = OptionGroup(parser, "Host options")
user_opts = OptionGroup(parser, "User options")
password_opts = OptionGroup(parser, "Password options")
machine_opts = OptionGroup(parser, "Machine options")
time_opts = OptionGroup(parser, "Timerange options")
query_opts = OptionGroup(parser, "Query options")
parser.add_option_group(gen_opts)
parser.add_option_group(host_opts)
parser.add_option_group(user_opts)
parser.add_option_group(password_opts)
parser.add_option_group(machine_opts)
parser.add_option_group(time_opts)
parser.add_option_group(query_opts)
#-d / --debug
gen_opts.add_option("-d", "--debug", dest="debug", default=False, action="store_true", help="enable debugging outputs (default: no)")
#-H / --host
host_opts.add_option("-H", "--host", dest="host", default="", action="store", metavar="HOST", help="defines graylog hostname or IP")
#-u / --user
user_opts.add_option("-u", "--user", dest="graylog_user", default="admin", action="store",metavar="USER", help="graylog user with access to API and event stream (default: admin)")
#-p / --password
password_opts.add_option("-p", "--password", dest="graylog_password", default="", action="store", metavar="PASSWORD", help="graylog user password (default: none)")
#-q / --query
query_opts.add_option("-q", "--query", dest="graylog_search_query", default=" ", action="store", metavar="QUERY", help="graylog search query (default: show all queries)")
#-m / --machine
machine_opts.add_option("-m", "--machine", dest="graylog_machine", default="all", action="store", type="string", metavar="MACHINE", help="machine to check for in graylog stream (default: all)")
#-t / --time
time_opts.add_option("-t", "--time", dest="timerange", action="store", default="86400", metavar="TIMERANGE", type="string", help="timerange since now in seconds (default 86400)")
#parse arguments
(options, args) = parser.parse_args()
host = options.host
user = options.graylog_user
password = options.graylog_password
query = options.graylog_search_query
machine = options.graylog_machine
timerange = options.timerange
crit = 0
warn = 0
result = ""
#set loggin
if options.debug:
logging.basicConfig(level=logging.DEBUG)
LOGGER.setLevel(logging.DEBUG)
else:
logging.basicConfig()
LOGGER.setLevel(logging.INFO)
proto,session_id = create_session(headers, host, user, password)
result,crit = search_graylog_for_alerts(headers, session_id, host, query, machine, timerange, crit, warn, result, proto)
if crit == 1:
print(result)
sys.exit(2)
else:
print(result)
sys.exit(0)