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elastic.py
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elastic.py
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import dateparser
import requests
import collections
import datetime
import json
import logging
import queue
import signal
import smtplib
import socket
import threading
import time
alert_queue = queue.Queue()
class ListenerWorker(threading.Thread):
def __init__(self, sock):
threading.Thread.__init__(self)
self.daemon = False
self.name = f'ListenerWorker{sock.fileno()}'
self.__sock = sock
self.__stop = False
def run(self):
self.__sock.settimeout(1)
buf = b''
stats = collections.defaultdict(int)
last = time.time()
while not self.__stop:
if len(stats) > 0 and time.time() - last >= 3600:
logging.info('stats: %s', ', '.join(['%s = %d' % (k, stats[k]) for k in sorted(stats.keys())]))
stats = collections.defaultdict(int)
last = time.time()
try:
b = self.__sock.recv(1024)
except socket.timeout as e:
continue
# Socket closed by peer
if b == b'':
break
logging.debug('b = %r', b)
buf += b
lines = buf.splitlines(keepends=True)
buf = b''
# Handle an incomplete last line
if lines[-1][-1] != ord('\n'):
buf = lines[-1]
lines = lines[:-1]
stats['incomplete'] += 1
for line in lines:
logging.info('received line: %r', line)
stats['lines-read'] += 1
try:
record = json.loads(line)
except Exception as e:
logging.error('error processing line = %r: %s', line, e)
stats['bad-json'] += 1
continue
if record.get('event_type') != 'alert':
stats['non-alerts'] += 1
continue
alert_queue.put(line)
if buf != b'':
logging.warning('unused buffer: %r', buf)
self.__sock.close()
def stop(self):
self.__stop = True
class Listener(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = False
self.name = 'Listener'
self.__stop = False
self.__workers = []
def run(self):
self.__server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.__server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.__server.bind(('127.0.0.1', 7834))
self.__server.listen()
self.__server.settimeout(1)
last = time.time()
while not self.__stop:
try:
client, info = self.__server.accept()
except socket.timeout:
continue
# Clean out dead worker threads periodically
if time.time() - last > 100:
self.__workers = [w for w in self.__workers if w.is_alive()]
last = time.time()
logging.info('received a connection from %s:%d', info[0], info[1])
worker = ListenerWorker(client); worker.start()
self.__workers += [worker]
self.__server.close()
def stop(self):
self.__stop = True
for w in self.__workers:
if w.is_alive():
w.stop(); w.join()
class Notifier(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = False
self.name = 'Notifier'
self.__stop = False
def run(self):
# Get the Kibana index pattern guid (used later when building Kibana urls)
index_pattern_guid = None
resp = requests.get('http://127.0.0.1:5601/api/saved_objects/_find',
params = {'type':'index-pattern', 'search':'suricata-*'},
timeout = 100)
resp.raise_for_status()
for pattern in resp.json()['saved_objects']:
guid = pattern.get('id')
if guid is None:
continue
if pattern.get('attributes', {}).get('title') == 'suricata-*':
index_pattern_guid = guid
break
if index_pattern_guid is None:
logging.error('unable to determine index pattern guid')
return
logging.debug('index_pattern_guid = %s', index_pattern_guid)
def mail_alerts(alert_lines):
body = 'Subject: suricata alerts\r\nFrom: frosty@localhost\r\n'
if False:
body += '\n'.join([json.dumps(a.decode(), indent=4) for a in alert_lines])
else:
def get(alert, keys):
curval = alert
for key in keys:
if not isinstance(curval, dict) or key not in curval:
logging.warning('alert missing %s: %r', '.'.join(keys), alert)
return None
curval = curval[key]
return curval
def url(flowid, flowstart, timestamp):
url = 'http://127.0.0.1:5601/app/discover#/?' + \
'_g=(filters:!(),refreshInterval:(pause:!t,value:0),'
start = (dateparser.parse(flowstart) - datetime.timedelta(minutes=60)).isoformat()
end = (dateparser.parse(timestamp) + datetime.timedelta(minutes=60)).isoformat()
url += f"time:(from:'{start}',to:'{end}'))&" + \
'_a=(columns:!(event_type,src_ip,src_port,dest_ip,dest_port,proto,app_proto),' + \
f"filters:!(),index:'{index_pattern_guid}',interval:auto,sort:!()," + \
f"query:(language:kuery,query:'flow_id:{flowid}'))"
return url
valid = False
for alert_line in alert_lines:
try:
alert = json.loads(alert_line)
except Exception as e:
logging.error('error processing line = %r: %s', alert_line, e)
continue
signature = get(alert, ['alert', 'signature'])
flowid = get(alert, ['flow_id'])
flowstart = get(alert, ['flow', 'start'])
timestamp = get(alert, ['timestamp'])
if any([x is None for x in [signature, flowid, flowstart, timestamp]]):
continue
body += f'{signature}\n{url(flowid, flowstart, timestamp)}\n\n'
valid = True
if not valid:
return
smtp = smtplib.SMTP('127.0.0.1')
smtp.sendmail('frosty@localhost', 'root@localhost', body)
smtp.quit()
logging.info('sent mail with %d alerts', len(alerts))
last = time.time()
while not self.__stop:
if not alert_queue.empty() and time.time() - last >= 300:
alerts = []
while not alert_queue.empty():
alerts += [alert_queue.get()]
alert_queue.task_done()
mail_alerts(alerts)
last = time.time()
time.sleep(1)
if not alert_queue.empty():
alerts = []
while not alert_queue.empty():
alerts += [alert_queue.get()]
alert_queue.task_done()
mail_alerts(alerts)
def stop(self):
self.__stop = True
def main_elastic():
listener = Listener(); listener.start()
notifier = Notifier(); notifier.start()
# Gracefully stop on terminating signal
def stop(signum, frame):
logging.info('received signal %s', signal.Signals(signum).name)
listener.stop(); listener.join()
notifier.stop(); alert_queue.join(); notifier.join()
for s in [signal.SIGINT, signal.SIGTERM]:
signal.signal(s, stop)
# Gracefully stop if any individual thread stops
while True:
if not listener.is_alive():
notifier.stop(); alert_queue.join(); notifier.join()
break
if not notifier.is_alive():
listener.stop(); listener.join()
while not alert_queue.empty():
alert = alert_queue.get()
alert_queue.task_done()
logging.error('unhandled alert: %s', alert)
break
time.sleep(1)