| commit | author | age | ||
| 77f371 | 1 | #!/usr/bin/env python3.4 |
| T | 2 | # -*- coding:Utf-8 -*- |
| 3 | ||
| 4 | ||
| 5 | """ | |
| 6 | Author : thuban <thuban@yeuxdelibad.net> | |
| 7 | Licence : MIT | |
| 8 | ||
| 9 | Description : Mimic fail2ban with pf for OpenBSD. | |
| 10 | Inspired from http://www.vincentdelft.be/post/post_20161106 | |
| 11 | ||
| 12 | In pf.conf, add : | |
| 13 | table <vilain_bruteforce> persist | |
| 14 | block quick from <vilain_bruteforce> | |
| 15 | ||
| 16 | You might want to add a cron task to remove old banned IP. As example, to ban for one day max : | |
| 17 | pfctl -t vilain_bruteforce -T expire 86400 | |
| 18 | ||
| 19 | To see banned IP : | |
| 20 | pfctl -t vilain_bruteforce -T show | |
| 21 | ||
| 22 | """ | |
| 23 | ||
| 24 | import sys | |
| 25 | import os | |
| 26 | import configparser | |
| 27 | import re | |
| 28 | import time | |
| 29 | import logging | |
| 30 | import subprocess | |
| 31 | from multiprocessing import Process, Queue, TimeoutError | |
| 32 | ||
| 33 | configfile = "/etc/vilain.conf" | |
| 34 | version = "0.1" | |
| 35 | vilain_table = "vilain_bruteforce" | |
| 36 | logfile = "/var/log/daemon" | |
| 37 | ||
| 38 | if os.geteuid() != 0: | |
| 39 | print("Only root can use this tool") | |
| 40 | sys.exit() | |
| 41 | ||
| 42 | # Configure logging | |
| 43 | logger = logging.getLogger(__name__) | |
| 44 | logging.basicConfig(filename=logfile, | |
| 45 | format='%(asctime)s %(module)s:%(funcName)s:%(message)s', | |
| 46 | datefmt='%H:%M:%S') | |
| 47 | logger.setLevel(logging.DEBUG) | |
| 48 | ch = logging.StreamHandler(sys.stdout) | |
| 49 | logger.addHandler(ch) | |
| 50 | ||
| 51 | # functions | |
| 52 | def readconfig(): | |
| 53 | if not os.path.isfile(configfile): | |
| 54 | logging.error("Can't read config file, exiting...") | |
| 55 | sys.exit(1) | |
| 56 | ||
| 57 | config = configparser.ConfigParser() | |
| 58 | config.read(configfile) | |
| 59 | return(config) | |
| 60 | ||
| 61 | def load_config(): | |
| 62 | c = readconfig() | |
| 63 | d = c.defaults() | |
| 64 | watch_while = int(d['watch_while']) | |
| 65 | maxtries = int(d['maxtries']) | |
| 66 | vilain_table = d['vilain_table'] | |
| 67 | return(watch_while, maxtries, vilain_table) | |
| 68 | ||
| 69 | def load_sections(): | |
| 70 | c = readconfig() | |
| 71 | for s in c.sections(): | |
| 72 | logfile = c.get(s,'logfile') | |
| 73 | regex = c.get(s,'regex') | |
| 74 | d = {'name' : s, 'logfile':logfile, 'regex':regex} | |
| 75 | yield d | |
| 76 | ||
| 77 | ||
| 78 | def check_logs(logfile, regex, bad_ip_queue): | |
| 79 | """ | |
| 80 | worker who put in bad_ip_queue bruteforce IP | |
| 81 | """ | |
| 82 | if not os.path.isfile(logfile) : | |
| 83 | logger.warning("{} doesn't exist".format(logfile)) | |
| 84 | return | |
| 85 | # Watch the file for changes | |
| 86 | stat = os.stat(logfile) | |
| 87 | size = stat.st_size | |
| 88 | mtime = stat.st_mtime | |
| 89 | RE = re.compile(regex) | |
| 90 | while True: | |
| 91 | time.sleep(0.5) | |
| 92 | stat = os.stat(logfile) | |
| 93 | if mtime < stat.st_mtime: | |
| 94 | mtime = stat.st_mtime | |
| 95 | with open(logfile, "rb") as f: | |
| 96 | f.seek(size) | |
| 97 | lines = f.readlines() | |
| 98 | ul = [ u.decode() for u in lines ] | |
| 99 | line = "".join(ul).strip() | |
| 100 | ||
| 101 | ret = RE.match(line) | |
| 102 | if ret: | |
| 103 | bad_ip = ret.groups()[0] | |
| 104 | bad_ip_queue.put(bad_ip) | |
| 105 | size = stat.st_size | |
| 106 | ||
| 107 | def ban_ips(bad_ip_queue, watch_while, maxtries, vilain_table): | |
| 108 | """ | |
| 109 | worker who ban IP on bad_ip_queue | |
| 110 | add IP in bad_ips_list | |
| 111 | record time when this IP has been seen in ip_seen_at = { ip:time } | |
| 112 | ||
| 113 | check number of occurence of the same ip in bad_ips_list | |
| 114 | if more than 3 : ban and clean of list | |
| 115 | ||
| 116 | check old ip in ip_seen_at : remove older than watch_while | |
| 117 | """ | |
| 118 | ||
| 119 | bad_ips_list = [] | |
| 120 | ip_seen_at = {} | |
| 121 | while True: | |
| 122 | try: | |
| 123 | ip = bad_ip_queue.get(0.5) | |
| 124 | logger.info("{} detected".format(ip)) | |
| 125 | bad_ips_list.append(ip) | |
| 126 | ip_seen_at[ip] = time.time() | |
| 127 | ||
| 128 | n_ip = bad_ips_list.count(ip) | |
| 129 | if n_ip >= maxtries: | |
| 130 | logger.info("Blacklisting {}".format(ip)) | |
| 131 | subprocess.call(["pfctl", "-t", vilain_table, "-T", "add", ip]) | |
| 132 | ip_seen_at.pop(ip) | |
| 133 | while ip in bad_ips_list: | |
| 134 | bad_ips_list.remove(ip) | |
| 135 | ||
| 136 | to_remove = [] | |
| 137 | for recorded_ip, last_seen in ip_seen_at.items(): | |
| 138 | if time.time() - last_seen >= watch_while: | |
| 139 | logger.info("{} not seen since a long time, forgetting...".format(recorded_ip)) | |
| 140 | to_remove.append(recorded_ip) | |
| 141 | for i in to_remove: | |
| 142 | ip_seen_at.pop(i) | |
| 143 | ||
| 144 | except TimeoutError: | |
| 145 | pass | |
| 146 | except KeyboardInterrupt: | |
| 147 | sys.exit(0) | |
| 148 | ||
| 149 | def main(): | |
| 150 | os.chdir(os.path.dirname(os.path.abspath(__file__))) | |
| 151 | ||
| 152 | watch_while, maxtries, vilain_table = load_config() | |
| 153 | bad_ip_queue = Queue() | |
| 154 | workers = [] | |
| 155 | ||
| 156 | for entry in load_sections(): | |
| 157 | logger.info("Start vilain for {}".format(entry['name'])) | |
| 158 | worker = Process(target=check_logs, | |
| 159 | args=(entry['logfile'], entry['regex'], bad_ip_queue)) | |
| 160 | workers.append(worker) | |
| 161 | worker.daemon = True | |
| 162 | worker.start() | |
| 163 | ||
| 164 | ban_worker = Process(target=ban_ips, args=(bad_ip_queue, watch_while, maxtries)) | |
| 165 | workers.append(ban_worker) | |
| 166 | ban_worker.daemon = True | |
| 167 | ban_worker.start() | |
| 168 | ||
| 169 | for w in workers: | |
| 170 | w.join() | |
| 171 | ||
| 172 | return 0 | |
| 173 | ||
| 174 | if __name__ == '__main__': | |
| 175 | main() | |
| 176 | ||
| 177 | ||
| 178 | # vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4 | |
| 179 | ||
