| commit | author | age | ||
| 3a37e6 | 1 | #!/usr/bin/env python3 |
| T | 2 | # -*- coding:Utf-8 -*- |
| 3 | ||
| 4 | ||
| 5 | """ | |
| 6 | Author : thuban <thuban@yeuxdelibad.net> | |
| 7 | Licence : MIT | |
| 8 | Require : python >= 3.5 | |
| 9 | ||
| 10 | Description : Mimic fail2ban with pf for OpenBSD. | |
| 11 | Inspired from http://www.vincentdelft.be/post/post_20161106 | |
| 40cb2e | 12 | with improvements of vincendelft |
| 3a37e6 | 13 | |
| T | 14 | In pf.conf, add : |
| 15 | table <vilain_bruteforce> persist | |
| 16 | block quick from <vilain_bruteforce> | |
| 17 | ||
| 18 | To see banned IP : | |
| 19 | pfctl -t vilain_bruteforce -T show | |
| 20 | """ | |
| 21 | ||
| 22 | import sys | |
| 23 | import os | |
| 24 | import configparser | |
| 25 | import re | |
| 26 | import logging | |
| 27 | import subprocess | |
| 28 | import asyncio | |
| 29 | import time | |
| 30 | ||
| 31 | configfile = "/etc/vilain.conf" | |
| 40cb2e | 32 | version = "0.4" |
| 3a37e6 | 33 | vilain_table = "vilain_bruteforce" |
| T | 34 | logfile = "/var/log/daemon" |
| 35 | ||
| 36 | if os.geteuid() != 0: | |
| 37 | print("Only root can use this tool") | |
| 38 | sys.exit() | |
| 39 | ||
| 40 | # Configure logging | |
| 41 | logger = logging.getLogger(__name__) | |
| 42 | logging.basicConfig(filename=logfile, | |
| 43 | format='%(asctime)s %(module)s:%(funcName)s:%(message)s', | |
| 44 | datefmt='%H:%M:%S') | |
| 40cb2e | 45 | logger.setLevel(logging.INFO) |
| 3a37e6 | 46 | ch = logging.StreamHandler(sys.stdout) |
| T | 47 | logger.addHandler(ch) |
| 48 | ||
| 49 | # functions | |
| 50 | def readconfig(): | |
| 51 | if not os.path.isfile(configfile): | |
| 52 | logging.error("Can't read config file, exiting...") | |
| 53 | sys.exit(1) | |
| 54 | ||
| 55 | config = configparser.ConfigParser() | |
| 56 | config.read(configfile) | |
| 57 | return(config) | |
| 58 | ||
| 59 | def load_config(): | |
| 60 | c = readconfig() | |
| 61 | d = c.defaults() | |
| 62 | watch_while = int(d['watch_while']) | |
| 40cb2e | 63 | default_maxtries = int(d['maxtries']) |
| 3a37e6 | 64 | vilain_table = d['vilain_table'] |
| 40cb2e | 65 | sleeptime = float(d['sleeptime']) |
| T | 66 | ignore_ips = [] |
| 3a37e6 | 67 | |
| T | 68 | if c.has_section('ignoreip'): |
| 40cb2e | 69 | ignoreips = [ i[1] for i in c.items('ignoreip') if i[0] not in c.defaults()] |
| T | 70 | return(watch_while, default_maxtries, vilain_table, ignoreips, sleeptime) |
| 3a37e6 | 71 | |
| T | 72 | def load_sections(): |
| 73 | c = readconfig() | |
| 74 | for s in c.sections(): | |
| 75 | if c.has_option(s,'logfile'): | |
| 76 | logfile = c.get(s,'logfile') | |
| 77 | regex = c.get(s,'regex') | |
| 40cb2e | 78 | #we take the default value of maxtries |
| T | 79 | maxtries = c.defaults()['maxtries'] |
| 80 | if c.has_option(s,'maxtries'): | |
| 81 | #if we have a maxtries defined in the section, we overwrite the default | |
| 82 | maxtries = int(c.get(s,'maxtries')) | |
| 83 | d = {'name' : s, 'logfile':logfile, 'regex':regex, 'maxtries': maxtries} | |
| 3a37e6 | 84 | yield d |
| 40cb2e | 85 | |
| 3a37e6 | 86 | |
| T | 87 | class Vilain(): |
| 88 | def __init__(self): | |
| 89 | self.loop = asyncio.get_event_loop() | |
| 40cb2e | 90 | self.watch_while, self.default_maxtries, self.vilain_table, self.ignore_ips, self.sleeptime = load_config() |
| T | 91 | self.ip_seen_at = {} |
| 92 | self.load_bad_ips() | |
| 3a37e6 | 93 | self.bad_ip_queue = asyncio.Queue(loop=self.loop) |
| T | 94 | |
| 95 | for entry in load_sections(): | |
| 96 | logger.info("Start vilain for {}".format(entry['name'])) | |
| 40cb2e | 97 | asyncio.ensure_future(self.check_logs(entry['logfile'], entry['maxtries'], entry['regex'], entry['name'])) |
| 3a37e6 | 98 | |
| T | 99 | asyncio.ensure_future(self.ban_ips()) |
| 40cb2e | 100 | |
| T | 101 | def load_bad_ips(self): |
| 102 | try: | |
| 103 | ret = subprocess.check_output(["pfctl", "-t", self.vilain_table, "-T", "show"]) | |
| 104 | except: | |
| 105 | ret = "" | |
| 106 | for res in ret.split(): | |
| 107 | ip = res.strip().decode('utf-8') | |
| 108 | logger.debug('Add existing banned IPs in your pf table: {}'.format(ip)) | |
| 109 | #we assign the counter to 1, but for sure we don't know the real value | |
| 110 | self.ip_seen_at[ip]={'time':time.time(),'count':1} | |
| 111 | ||
| 3a37e6 | 112 | |
| T | 113 | def start(self): |
| 114 | try: | |
| 115 | self.loop.run_forever() | |
| 116 | except KeyboardInterrupt: | |
| 117 | self.loop.close() | |
| 118 | finally: | |
| 119 | self.loop.close() | |
| 120 | ||
| 40cb2e | 121 | async def check_logs(self, logfile, maxtries, regex, reason): |
| 3a37e6 | 122 | """ |
| T | 123 | worker who put in bad_ip_queue bruteforce IP |
| 124 | """ | |
| 125 | if not os.path.isfile(logfile) : | |
| 126 | logger.warning("{} doesn't exist".format(logfile)) | |
| 127 | else : | |
| 128 | # Watch the file for changes | |
| 129 | stat = os.stat(logfile) | |
| 130 | size = stat.st_size | |
| 131 | mtime = stat.st_mtime | |
| 132 | RE = re.compile(regex) | |
| 133 | while True: | |
| 40cb2e | 134 | await asyncio.sleep(self.sleeptime) |
| 3a37e6 | 135 | stat = os.stat(logfile) |
| T | 136 | if mtime < stat.st_mtime: |
| 40cb2e | 137 | logger.debug("{} has been modified".format(logfile)) |
| 3a37e6 | 138 | mtime = stat.st_mtime |
| T | 139 | with open(logfile, "rb") as f: |
| 140 | f.seek(size) | |
| 141 | lines = f.readlines() | |
| 142 | ul = [ u.decode() for u in lines ] | |
| 143 | line = "".join(ul).strip() | |
| 144 | ||
| 145 | ret = RE.match(line) | |
| 40cb2e | 146 | logger.debug('line:{}'.format(line)) |
| 3a37e6 | 147 | if ret: |
| T | 148 | bad_ip = ret.groups()[0] |
| 40cb2e | 149 | if bad_ip not in self.ignore_ips : |
| T | 150 | logger.info('line match {} because of rule : {}'.format(bad_ip, reason)) |
| 3a37e6 | 151 | await self.bad_ip_queue.put({'ip' : bad_ip, 'reason' : reason}) |
| 40cb2e | 152 | logger.debug('queue size: {}'.format(self.bad_ip_queue.qsize())) |
| T | 153 | else: |
| 154 | logger.info('line match {}. But IP in ignore list'.format(bad_ip)) | |
| 3a37e6 | 155 | size = stat.st_size |
| T | 156 | |
| 157 | async def ban_ips(self): | |
| 158 | """ | |
| 40cb2e | 159 | record time when this IP has been seen in ip_seen_at = { ip:{'time':<time>,'count':<counter} } |
| 3a37e6 | 160 | |
| T | 161 | check old ip in ip_seen_at : remove older than watch_while |
| 162 | """ | |
| 40cb2e | 163 | logger.info('ban_ips sarted with sleeptime={}'.format(self.sleeptime)) |
| 3a37e6 | 164 | while True: |
| 40cb2e | 165 | await asyncio.sleep(self.sleeptime) |
| 3a37e6 | 166 | ip_item = await self.bad_ip_queue.get() |
| 40cb2e | 167 | logger.debug('ban_ips awake') |
| 3a37e6 | 168 | ip = ip_item['ip'] |
| T | 169 | reason = ip_item['reason'] |
| 40cb2e | 170 | maxtries = ip_item['maxtries'] |
| T | 171 | self.ip_seen_at.setdefault(ip,{'time':time.time(),'count':0}) |
| 172 | self.ip_seen_at[ip]['count'] += 1 | |
| 173 | n_ip = self.ip_seen_at[ip]['count'] | |
| 174 | logger.info("{} detected, reason {}, count: {}, maxtries: {}".format(ip, reason, n_ip, maxtries)) | |
| 175 | if n_ip >= maxtries: | |
| 176 | ret = subprocess.call(["pfctl", "-t", self.vilain_table, "-T", "add", ip]) | |
| 177 | logger.info("Blacklisting {}, return code:{}".format(ip, ret)) | |
| 178 | self.ip_seen_at.pop(ip) | |
| 3a37e6 | 179 | to_remove = [] |
| 40cb2e | 180 | for recorded_ip, data in self.ip_seen_at.items(): |
| T | 181 | if time.time() - data['time'] >= self.watch_while: |
| 182 | ret = subprocess.call(["pfctl", "-t", self.vilain_table, "-T", "delete", recorded_ip]) | |
| 183 | logger.info("{} not blocked any more, return code:{}".format(recorded_ip, ret)) | |
| 3a37e6 | 184 | to_remove.append(recorded_ip) |
| 40cb2e | 185 | for ip in to_remove: |
| T | 186 | self.ip_seen_at.pop(ip) |
| 187 | #for debugging, this line allow us to see if the script run until here | |
| 188 | logger.debug('ban_ips end:{}'.format(self.ip_seen_at)) | |
| 189 | ||
| 190 | ||
| 191 | ||
| 192 | ||
| 3a37e6 | 193 | |
| T | 194 | |
| 195 | ||
| 196 | ||
| 197 | ||
| 198 | def main(): | |
| 199 | os.chdir(os.path.dirname(os.path.abspath(__file__))) | |
| 200 | v = Vilain() | |
| b14b1a | 201 | v.start() |
| 3a37e6 | 202 | return 0 |
| T | 203 | |
| 204 | if __name__ == '__main__': | |
| 205 | main() | |
| 206 | ||
| 207 | ||
| 208 | # vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4 | |
| 209 | ||
