mailcow/data/Dockerfiles/fail2ban/logwatch.py

185 lines
6.3 KiB
Python

#!/usr/bin/env python2
import re
import os
import time
import atexit
import signal
import ipaddress
import subprocess
from threading import Thread
import redis
import time
import json
yes_regex = re.compile(r'([yY][eE][sS]|[yY])+$')
if re.search(yes_regex, os.getenv('SKIP_FAIL2BAN', 0)):
print "Skipping Fail2ban container..."
raise SystemExit
r = redis.StrictRedis(host='172.22.1.249', decode_responses=True, port=6379, db=0)
pubsub = r.pubsub()
RULES = {}
RULES[1] = 'warning: .*\[([0-9a-f\.:]+)\]: SASL .+ authentication failed'
RULES[2] = '-login: Disconnected \(auth failed, .+\): user=.*, method=.+, rip=([0-9a-f\.:]+),'
RULES[3] = '-login: Aborted login \(no auth .+\): user=.+, rip=([0-9a-f\.:]+), lip.+'
RULES[4] = '-login: Aborted login \(tried to use disallowed .+\): user=.+, rip=([0-9a-f\.:]+), lip.+'
RULES[5] = 'SOGo.+ Login from \'([0-9a-f\.:]+)\' for user .+ might not have worked'
RULES[6] = 'mailcow UI: Invalid password for .+ by ([0-9a-f\.:]+)'
r.setnx("F2B_BAN_TIME", "1800")
r.setnx("F2B_MAX_ATTEMPTS", "10")
r.setnx("F2B_RETRY_WINDOW", "600")
bans = {}
log = {}
quit_now = False
def ban(address):
BAN_TIME = int(r.get("F2B_BAN_TIME"))
MAX_ATTEMPTS = int(r.get("F2B_MAX_ATTEMPTS"))
RETRY_WINDOW = int(r.get("F2B_RETRY_WINDOW"))
WHITELIST = r.hgetall("F2B_WHITELIST")
ip = ipaddress.ip_address(address.decode('ascii'))
if type(ip) is ipaddress.IPv6Address and ip.ipv4_mapped:
ip = ip.ipv4_mapped
address = str(ip)
if ip.is_private or ip.is_loopback:
return
self_network = ipaddress.ip_network(address.decode('ascii'))
if WHITELIST:
for wl_key in WHITELIST:
wl_net = ipaddress.ip_network(wl_key.decode('ascii'), False)
if wl_net.overlaps(self_network):
log['time'] = int(round(time.time()))
log['priority'] = "info"
log['message'] = "Address %s is whitelisted by rule %s" % (self_network, wl_net)
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "Address %s is whitelisted by rule %s" % (self_network, wl_net)
return
net = ipaddress.ip_network((address + ('/24' if type(ip) is ipaddress.IPv4Address else '/64')).decode('ascii'), strict=False)
net = str(net)
if not net in bans or time.time() - bans[net]['last_attempt'] > RETRY_WINDOW:
bans[net] = { 'attempts': 0 }
active_window = RETRY_WINDOW
else:
active_window = time.time() - bans[net]['last_attempt']
bans[net]['attempts'] += 1
bans[net]['last_attempt'] = time.time()
active_window = time.time() - bans[net]['last_attempt']
if bans[net]['attempts'] >= MAX_ATTEMPTS:
log['time'] = int(round(time.time()))
log['priority'] = "crit"
log['message'] = "Banning %s" % net
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "Banning %s for %d minutes" % (net, BAN_TIME / 60)
if type(ip) is ipaddress.IPv4Address:
subprocess.call(["iptables", "-I", "INPUT", "-s", net, "-j", "REJECT"])
subprocess.call(["iptables", "-I", "FORWARD", "-s", net, "-j", "REJECT"])
else:
subprocess.call(["ip6tables", "-I", "INPUT", "-s", net, "-j", "REJECT"])
subprocess.call(["ip6tables", "-I", "FORWARD", "-s", net, "-j", "REJECT"])
r.hset("F2B_ACTIVE_BANS", "%s" % net, log['time'] + BAN_TIME)
else:
log['time'] = int(round(time.time()))
log['priority'] = "warn"
log['message'] = "%d more attempts in the next %d seconds until %s is banned" % (MAX_ATTEMPTS - bans[net]['attempts'], RETRY_WINDOW, net)
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "%d more attempts in the next %d seconds until %s is banned" % (MAX_ATTEMPTS - bans[net]['attempts'], RETRY_WINDOW, net)
def unban(net):
log['time'] = int(round(time.time()))
log['priority'] = "info"
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
if not net in bans:
log['message'] = "%s is not banned, skipping unban and deleting from queue (if any)" % net
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "%s is not banned, skipping unban and deleting from queue (if any)" % net
r.hdel("F2B_QUEUE_UNBAN", "%s" % net)
return
log['message'] = "Unbanning %s" % net
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "Unbanning %s" % net
if type(ipaddress.ip_network(net.decode('ascii'))) is ipaddress.IPv4Network:
subprocess.call(["iptables", "-D", "INPUT", "-s", net, "-j", "REJECT"])
subprocess.call(["iptables", "-D", "FORWARD", "-s", net, "-j", "REJECT"])
else:
subprocess.call(["ip6tables", "-D", "INPUT", "-s", net, "-j", "REJECT"])
subprocess.call(["ip6tables", "-D", "FORWARD", "-s", net, "-j", "REJECT"])
r.hdel("F2B_ACTIVE_BANS", "%s" % net)
r.hdel("F2B_QUEUE_UNBAN", "%s" % net)
del bans[net]
def quit(signum, frame):
global quit_now
quit_now = True
def clear():
log['time'] = int(round(time.time()))
log['priority'] = "info"
log['message'] = "Clearing all bans"
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
print "Clearing all bans"
for net in bans.copy():
unban(net)
pubsub.unsubscribe()
def watch():
log['time'] = int(round(time.time()))
log['priority'] = "info"
log['message'] = "Watching Redis channel F2B_CHANNEL"
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
pubsub.subscribe("F2B_CHANNEL")
print "Subscribing to Redis channel F2B_CHANNEL"
while True:
for item in pubsub.listen():
for rule_id, rule_regex in RULES.iteritems():
if item['data'] and item['type'] == 'message':
result = re.search(rule_regex, item['data'])
if result:
addr = result.group(1)
print "%s matched rule id %d" % (addr, rule_id)
log['time'] = int(round(time.time()))
log['priority'] = "warn"
log['message'] = "%s matched rule id %d" % (addr, rule_id)
r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
ban(addr)
def autopurge():
while not quit_now:
BAN_TIME = int(r.get("F2B_BAN_TIME"))
MAX_ATTEMPTS = int(r.get("F2B_MAX_ATTEMPTS"))
QUEUE_UNBAN = r.hgetall("F2B_QUEUE_UNBAN")
if QUEUE_UNBAN:
for net in QUEUE_UNBAN:
unban(str(net))
for net in bans.copy():
if bans[net]['attempts'] >= MAX_ATTEMPTS:
if time.time() - bans[net]['last_attempt'] > BAN_TIME:
unban(net)
time.sleep(10)
if __name__ == '__main__':
watch_thread = Thread(target=watch)
watch_thread.daemon = True
watch_thread.start()
autopurge_thread = Thread(target=autopurge)
autopurge_thread.daemon = True
autopurge_thread.start()
signal.signal(signal.SIGTERM, quit)
atexit.register(clear)
while not quit_now:
time.sleep(0.5)