186 lines
6.3 KiB
Python
186 lines
6.3 KiB
Python
#!/usr/bin/env python2
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import re
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import os
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import time
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import atexit
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import signal
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import ipaddress
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import subprocess
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from threading import Thread
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import redis
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import time
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import json
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yes_regex = re.compile(r'([yY][eE][sS]|[yY])+$')
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if re.search(yes_regex, os.getenv('SKIP_FAIL2BAN', 0)):
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print "SKIP_FAIL2BAN=y, Skipping Fail2ban container..."
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time.sleep(31536000)
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raise SystemExit
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r = redis.StrictRedis(host='172.22.1.249', decode_responses=True, port=6379, db=0)
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pubsub = r.pubsub()
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RULES = {}
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RULES[1] = 'warning: .*\[([0-9a-f\.:]+)\]: SASL .+ authentication failed'
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RULES[2] = '-login: Disconnected \(auth failed, .+\): user=.*, method=.+, rip=([0-9a-f\.:]+),'
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RULES[3] = '-login: Aborted login \(no auth .+\): user=.+, rip=([0-9a-f\.:]+), lip.+'
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RULES[4] = '-login: Aborted login \(tried to use disallowed .+\): user=.+, rip=([0-9a-f\.:]+), lip.+'
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RULES[5] = 'SOGo.+ Login from \'([0-9a-f\.:]+)\' for user .+ might not have worked'
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RULES[6] = 'mailcow UI: Invalid password for .+ by ([0-9a-f\.:]+)'
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r.setnx("F2B_BAN_TIME", "1800")
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r.setnx("F2B_MAX_ATTEMPTS", "10")
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r.setnx("F2B_RETRY_WINDOW", "600")
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bans = {}
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log = {}
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quit_now = False
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def ban(address):
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BAN_TIME = int(r.get("F2B_BAN_TIME"))
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MAX_ATTEMPTS = int(r.get("F2B_MAX_ATTEMPTS"))
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RETRY_WINDOW = int(r.get("F2B_RETRY_WINDOW"))
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WHITELIST = r.hgetall("F2B_WHITELIST")
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ip = ipaddress.ip_address(address.decode('ascii'))
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if type(ip) is ipaddress.IPv6Address and ip.ipv4_mapped:
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ip = ip.ipv4_mapped
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address = str(ip)
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if ip.is_private or ip.is_loopback:
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return
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self_network = ipaddress.ip_network(address.decode('ascii'))
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if WHITELIST:
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for wl_key in WHITELIST:
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wl_net = ipaddress.ip_network(wl_key.decode('ascii'), False)
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if wl_net.overlaps(self_network):
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log['time'] = int(round(time.time()))
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log['priority'] = "info"
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log['message'] = "Address %s is whitelisted by rule %s" % (self_network, wl_net)
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "Address %s is whitelisted by rule %s" % (self_network, wl_net)
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return
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net = ipaddress.ip_network((address + ('/24' if type(ip) is ipaddress.IPv4Address else '/64')).decode('ascii'), strict=False)
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net = str(net)
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if not net in bans or time.time() - bans[net]['last_attempt'] > RETRY_WINDOW:
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bans[net] = { 'attempts': 0 }
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active_window = RETRY_WINDOW
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else:
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active_window = time.time() - bans[net]['last_attempt']
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bans[net]['attempts'] += 1
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bans[net]['last_attempt'] = time.time()
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active_window = time.time() - bans[net]['last_attempt']
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if bans[net]['attempts'] >= MAX_ATTEMPTS:
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log['time'] = int(round(time.time()))
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log['priority'] = "crit"
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log['message'] = "Banning %s" % net
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "Banning %s for %d minutes" % (net, BAN_TIME / 60)
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if type(ip) is ipaddress.IPv4Address:
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subprocess.call(["iptables", "-I", "INPUT", "-s", net, "-j", "REJECT"])
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subprocess.call(["iptables", "-I", "FORWARD", "-s", net, "-j", "REJECT"])
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else:
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subprocess.call(["ip6tables", "-I", "INPUT", "-s", net, "-j", "REJECT"])
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subprocess.call(["ip6tables", "-I", "FORWARD", "-s", net, "-j", "REJECT"])
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r.hset("F2B_ACTIVE_BANS", "%s" % net, log['time'] + BAN_TIME)
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else:
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log['time'] = int(round(time.time()))
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log['priority'] = "warn"
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log['message'] = "%d more attempts in the next %d seconds until %s is banned" % (MAX_ATTEMPTS - bans[net]['attempts'], RETRY_WINDOW, net)
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "%d more attempts in the next %d seconds until %s is banned" % (MAX_ATTEMPTS - bans[net]['attempts'], RETRY_WINDOW, net)
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def unban(net):
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log['time'] = int(round(time.time()))
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log['priority'] = "info"
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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if not net in bans:
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log['message'] = "%s is not banned, skipping unban and deleting from queue (if any)" % net
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "%s is not banned, skipping unban and deleting from queue (if any)" % net
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r.hdel("F2B_QUEUE_UNBAN", "%s" % net)
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return
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log['message'] = "Unbanning %s" % net
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "Unbanning %s" % net
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if type(ipaddress.ip_network(net.decode('ascii'))) is ipaddress.IPv4Network:
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subprocess.call(["iptables", "-D", "INPUT", "-s", net, "-j", "REJECT"])
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subprocess.call(["iptables", "-D", "FORWARD", "-s", net, "-j", "REJECT"])
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else:
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subprocess.call(["ip6tables", "-D", "INPUT", "-s", net, "-j", "REJECT"])
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subprocess.call(["ip6tables", "-D", "FORWARD", "-s", net, "-j", "REJECT"])
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r.hdel("F2B_ACTIVE_BANS", "%s" % net)
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r.hdel("F2B_QUEUE_UNBAN", "%s" % net)
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del bans[net]
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def quit(signum, frame):
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global quit_now
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quit_now = True
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def clear():
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log['time'] = int(round(time.time()))
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log['priority'] = "info"
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log['message'] = "Clearing all bans"
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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print "Clearing all bans"
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for net in bans.copy():
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unban(net)
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pubsub.unsubscribe()
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def watch():
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log['time'] = int(round(time.time()))
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log['priority'] = "info"
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log['message'] = "Watching Redis channel F2B_CHANNEL"
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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pubsub.subscribe("F2B_CHANNEL")
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print "Subscribing to Redis channel F2B_CHANNEL"
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while True:
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for item in pubsub.listen():
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for rule_id, rule_regex in RULES.iteritems():
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if item['data'] and item['type'] == 'message':
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result = re.search(rule_regex, item['data'])
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if result:
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addr = result.group(1)
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print "%s matched rule id %d" % (addr, rule_id)
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log['time'] = int(round(time.time()))
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log['priority'] = "warn"
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log['message'] = "%s matched rule id %d" % (addr, rule_id)
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r.lpush("F2B_LOG", json.dumps(log, ensure_ascii=False))
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ban(addr)
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def autopurge():
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while not quit_now:
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BAN_TIME = int(r.get("F2B_BAN_TIME"))
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MAX_ATTEMPTS = int(r.get("F2B_MAX_ATTEMPTS"))
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QUEUE_UNBAN = r.hgetall("F2B_QUEUE_UNBAN")
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if QUEUE_UNBAN:
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for net in QUEUE_UNBAN:
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unban(str(net))
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for net in bans.copy():
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if bans[net]['attempts'] >= MAX_ATTEMPTS:
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if time.time() - bans[net]['last_attempt'] > BAN_TIME:
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unban(net)
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time.sleep(10)
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if __name__ == '__main__':
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watch_thread = Thread(target=watch)
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watch_thread.daemon = True
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watch_thread.start()
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autopurge_thread = Thread(target=autopurge)
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autopurge_thread.daemon = True
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autopurge_thread.start()
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signal.signal(signal.SIGTERM, quit)
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atexit.register(clear)
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while not quit_now:
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time.sleep(0.5)
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