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minimal.py
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minimal.py
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import inotify.adapters
import collections
import json
import logging
import os
import queue
import signal
import smtplib
import sys
import threading
import time
alert_queue = queue.Queue()
class Parser(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = False
self.name = 'Parser'
self.stop = False
def run(self):
open_evefile = lambda: open('/var/log/suricata/eve.json', 'r', encoding='utf-8')
start_inotifier = lambda path: inotify.adapters.Inotify(paths=[path])
evefile = open_evefile()
evefile.seek(0, os.SEEK_END)
inotifier = start_inotifier(evefile.name)
stats = collections.defaultdict(int)
last = time.time()
while not self.stop:
reopen, restart = False, False
for event in inotifier.event_gen(timeout_s=1):
if event is None:
continue
logging.debug('event = %r', event)
_, types, _, _ = event
for t in types:
# If the file is modified read lines until eof
if t == 'IN_MODIFY':
while not self.stop:
pos = evefile.tell()
line = evefile.readline()
if line == '':
break
# Handle incomplete lines
if isinstance(line, bytes) or not line.endswith('\n'):
evefile.seek(pos)
time.sleep(0.1)
stats['incomplete'] += 1
continue
logging.debug('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
break
if record.get('event_type') == 'alert':
alert_queue.put(record)
stats['alerts'] += 1
break
elif t in ['IN_CLOSE_WRITE', 'IN_DELETE_SELF', 'IN_MOVE_SELF', 'IN_IGNORED']:
reopen = True
if t == 'IN_IGNORED':
restart = True
if reopen:
logging.info('detected file write (eg log rotation), reopening file')
evefile.close()
evefile = open_evefile()
stats['reopens'] += 1
if restart:
inotifier = start_inotifier(evefile.name)
stats['restarts'] += 1
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()
evefile.close()
class Notifier(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = False
self.name = 'Notifier'
self.stop = False
def run(self):
def mail_alerts(alerts):
body = 'Subject: suricata alerts\r\nFrom: frosty@localhost\r\n'
body += '\n'.join([json.dumps(a, indent=4) for a in alerts])
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 main_minimal():
parser = Parser(); parser.start()
notifier = Notifier(); notifier.start()
# Gracefully stop on terminating signal
def stop(signum, frame):
logging.info('received signal %s', signal.Signals(signum).name)
parser.stop = True; parser.join()
notifier.stop = True; 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 parser.is_alive():
notifier.stop = True; alert_queue.join(); notifier.join()
break
if not notifier.is_alive():
parser.stop = True; parser.join()
while not alert_queue.empty():
alert = alert_queue.get()
alert_queue.task_done()
logging.error('unhandled alert: %s', alert)
break
time.sleep(1)