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424 lines
12 KiB
424 lines
12 KiB
#!/usr/bin/env python
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# This file is part of Fail2Ban.
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#
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# Fail2Ban is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Fail2Ban is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Fail2Ban; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Author: Cyril Jaquier
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#
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# $Revision$
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__author__ = "Cyril Jaquier"
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__version__ = "$Revision$"
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__date__ = "$Date$"
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__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
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__license__ = "GPL"
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import time, sys, getopt, os, string, signal
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from ConfigParser import *
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# Checks if log4py is present.
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try:
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import log4py
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except:
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print "log4py is needed (see README)"
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sys.exit(-1)
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# Appends our own modules path
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sys.path.append('/usr/lib/fail2ban')
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from firewall.firewall import Firewall
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from logreader.logreader import LogReader
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from confreader.configreader import ConfigReader
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from utils.process import *
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from version import version
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# Gets the instance of log4py.
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logSys = log4py.Logger().get_instance()
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def usage():
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print "Usage: fail2ban.py [OPTIONS]"
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print
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print "Fail2Ban v"+version+" reads log file that contains password failure report"
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print "and bans the corresponding IP address using iptables."
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print
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print " -b start fail2ban in background"
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print " -d start fail2ban in debug mode"
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print " -e <INTF> ban IP on the INTF interface"
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print " -c <FILE> read configuration file FILE"
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print " -p <FILE> create PID lock in FILE"
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print " -h display this help message"
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print " -i <IP(s)> IP(s) to ignore"
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print " -k kill a currently running Fail2Ban instance"
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print " -l <FILE> log message in FILE"
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print " -r <VALUE> allow a max of VALUE password failure"
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print " -t <TIME> ban IP for TIME seconds"
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print " -v verbose. Use twice for greater effect"
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print " -w <FIWA> select the firewall to use. Can be iptables,"
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print " ipfwadm or ipfw"
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print
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print "Report bugs to <lostcontrol@users.sourceforge.net>"
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sys.exit(0)
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def checkForRoot():
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""" Check for root user.
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"""
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uid = `os.getuid()`
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if uid == '0':
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return True
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else:
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return False
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def sigTERMhandler(signum, frame):
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""" Handles the TERM signal when in daemon mode in order to
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exit properly.
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"""
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logSys.debug("Signal handler called with sig "+`signum`)
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killApp()
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def killApp():
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""" Flush the ban list, remove the PID lock file and exit
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nicely.
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"""
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logSys.warn("Restoring firewall rules...")
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for element in logFwList:
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element[2].flushBanList(conf["debug"])
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removePID(conf["pidlock"])
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logSys.info("Exiting...")
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sys.exit(0)
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if __name__ == "__main__":
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logSys.set_formatstring("%T %L %M")
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conf = dict()
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conf["verbose"] = 0
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conf["background"] = False
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conf["debug"] = False
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conf["conffile"] = "/etc/fail2ban.conf"
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conf["pidlock"] = "/var/run/fail2ban.pid"
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conf["logging"] = False
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conf["logfile"] = "/var/log/fail2ban.log"
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conf["maxretry"] = 3
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conf["bantime"] = 600
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conf["ignoreip"] = ''
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conf["interface"] = "eth0"
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conf["firewall"] = "iptables"
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conf["ipfw-start-rule"] = 0
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conf["polltime"] = 1
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# Reads the command line options.
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try:
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optList, args = getopt.getopt(sys.argv[1:], 'hvbdkc:l:t:i:r:e:w:p:')
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except getopt.GetoptError:
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usage()
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# Pre-parsing of command line options for the -c option
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for opt in optList:
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if opt[0] == "-c":
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conf["conffile"] = opt[1]
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# Config file
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configParser = SafeConfigParser()
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configParser.read(conf["conffile"])
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# background
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try:
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conf["background"] = configParser.getboolean("DEFAULT", "background")
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except ValueError:
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logSys.warn("background option should be a boolean")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("background option not in config file")
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logSys.warn("Using default value")
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# debug
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try:
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conf["debug"] = configParser.getboolean("DEFAULT", "debug")
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except ValueError:
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logSys.warn("debug option should be a boolean")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("debug option not in config file")
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logSys.warn("Using default value")
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# logfile
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try:
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conf["logfile"] = configParser.get("DEFAULT", "logfile")
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except ValueError:
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logSys.warn("logfile option should be a string")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("logfile option not in config file")
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logSys.warn("Using default value")
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# pidlock
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try:
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conf["pidlock"] = configParser.get("DEFAULT", "pidlock")
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except ValueError:
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logSys.warn("pidlock option should be a string")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("pidlock option not in config file")
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logSys.warn("Using default value")
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# maxretry
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try:
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conf["maxretry"] = configParser.getint("DEFAULT", "maxretry")
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except ValueError:
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logSys.warn("maxretry option should be an integer")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("maxretry option not in config file")
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logSys.warn("Using default value")
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# bantime
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try:
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conf["bantime"] = configParser.getint("DEFAULT", "bantime")
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except ValueError:
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logSys.warn("bantime option should be an integer")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("bantime option not in config file")
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logSys.warn("Using default value")
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# ignoreip
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try:
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conf["ignoreip"] = configParser.get("DEFAULT", "ignoreip")
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except ValueError:
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logSys.warn("ignoreip option should be a string")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("ignoreip option not in config file")
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logSys.warn("Using default value")
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# interface
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try:
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conf["interface"] = configParser.get("DEFAULT", "interface")
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except ValueError:
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logSys.warn("interface option should be a string")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("interface option not in config file")
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logSys.warn("Using default value")
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# firewall
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try:
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conf["firewall"] = configParser.get("DEFAULT", "firewall")
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except ValueError:
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logSys.warn("firewall option should be a string")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("firewall option not in config file")
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logSys.warn("Using default value")
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# ipfw-start-rule
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try:
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conf["ipfw-start-rule"] = configParser.getint("DEFAULT",
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"ipfw-start-rule")
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except ValueError:
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logSys.warn("ipfw-start-rule option should be an integer")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("ipfw-start-rule option not in config file")
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logSys.warn("Using default value")
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# polltime
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try:
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conf["polltime"] = configParser.getint("DEFAULT", "polltime")
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except ValueError:
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logSys.warn("polltime option should be an integer")
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logSys.warn("Using default value")
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except NoOptionError:
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logSys.warn("polltime option not in config file")
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logSys.warn("Using default value")
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for opt in optList:
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if opt[0] == "-h":
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usage()
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if opt[0] == "-v":
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conf["verbose"] = conf["verbose"] + 1
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if opt[0] == "-b":
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conf["background"] = True
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if opt[0] == "-d":
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conf["debug"] = True
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if opt[0] == "-e":
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conf["interface"] = opt[1]
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if opt[0] == "-l":
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conf["logging"] = True
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conf["logfile"] = opt[1]
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if opt[0] == "-t":
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try:
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conf["bantime"] = int(opt[1])
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except ValueError:
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logSys.warn("banTime must be an integer")
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logSys.warn("Using default value")
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if opt[0] == "-i":
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conf["ignoreip"] = opt[1]
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if opt[0] == "-r":
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conf["retrymax"] = int(opt[1])
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if opt[0] == "-w":
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conf["firewall"] = opt[1]
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if opt[0] == "-p":
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conf["pidlock"] = opt[1]
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if opt[0] == "-k":
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pid = checkForPID(conf["pidlock"])
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if pid:
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killPID(int(pid))
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logSys.warn("Killed Fail2Ban with PID "+pid)
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sys.exit(0)
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else:
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logSys.error("No running Fail2Ban found")
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sys.exit(-1)
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# Process some options
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for c in conf:
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if c == "verbose":
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logSys.warn("Verbose level is "+`conf[c]`)
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if conf[c] == 1:
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logSys.set_loglevel(log4py.LOGLEVEL_VERBOSE)
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elif conf[c] > 1:
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logSys.set_loglevel(log4py.LOGLEVEL_DEBUG)
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elif c == "debug" and conf[c]:
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logSys.set_loglevel(log4py.LOGLEVEL_DEBUG)
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logSys.set_formatstring(log4py.FMT_DEBUG)
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elif c == "background" and conf[c]:
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retCode = createDaemon()
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signal.signal(signal.SIGTERM, sigTERMhandler)
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logSys.set_target(conf["logfile"])
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if not retCode:
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logSys.error("Unable to start daemon")
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sys.exit(-1)
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elif c == "logging" and conf[c]:
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try:
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open(conf["logfile"], "a")
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logSys.set_target(conf["logfile"])
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except IOError:
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logSys.warn("Unable to log to "+conf["logfile"])
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logSys.warn("Using default output for logging")
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elif c == "ignoreip":
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ignoreIPList = conf[c].split(' ')
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elif c == "firewall":
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conf[c] = string.lower(conf[c])
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if conf[c] == "ipfw":
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fireWallName = "Ipfw"
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elif conf[c] == "ipfwadm":
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fireWallName = "Ipfwadm"
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else:
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fireWallName = "Iptables"
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# Checks for root user. This is necessary because log files
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# are owned by root and firewall needs root access.
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if not checkForRoot():
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logSys.error("You must be root")
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if not conf["debug"]:
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sys.exit(-1)
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# Checks that no instance of Fail2Ban is currently running.
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pid = checkForPID(conf["pidlock"])
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if pid:
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logSys.error("Fail2Ban already running with PID "+pid)
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sys.exit(-1)
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else:
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createPID(conf["pidlock"])
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logSys.debug("ConfFile is "+conf["conffile"])
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logSys.debug("BanTime is "+`conf["bantime"]`)
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logSys.debug("retryAllowed is "+`conf["maxretry"]`)
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# Reads the config file and create a LogReader instance for
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# each log file to check.
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confReader = ConfigReader(conf["conffile"]);
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confReader.openConf()
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logFwList = list()
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for t in confReader.getSections():
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l = confReader.getLogOptions(t)
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if l["enabled"]:
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# Creates a logreader object
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lObj = LogReader(l["logfile"], l["timeregex"], l["timepattern"],
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l["failregex"], conf["bantime"])
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# Creates a firewall object
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fObj = Firewall(l["fwbanrule"], l["fwunbanrule"], conf["bantime"],
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conf["interface"])
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# Links them into a list. I'm not really happy
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# with this :/
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logFwList.append([t, lObj, fObj, dict()])
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# We add 127.0.0.1 to the ignore list has we do not want
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# to be ban ourself.
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for element in logFwList:
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element[1].addIgnoreIP("127.0.0.1")
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while len(ignoreIPList) > 0:
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ip = ignoreIPList.pop()
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for element in logFwList:
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element[1].addIgnoreIP(ip)
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logSys.info("Fail2Ban v"+version+" is running")
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# Main loop
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while True:
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try:
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sys.stdout.flush()
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sys.stderr.flush()
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# Checks if some IP have to be remove from ban
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# list.
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for element in logFwList:
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element[2].checkForUnBan(conf["debug"])
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# If the log file has not been modified since the
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# last time, we sleep for 1 second. This is active
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# polling so not very effective.
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modList = list()
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for element in logFwList:
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if element[1].isModified():
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modList.append(element)
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if len(modList) == 0:
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time.sleep(conf["polltime"])
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continue
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# Gets the failure list from the log file. For a given IP,
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# takes only the service which has the most password failures.
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for element in modList:
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e = element[1].getFailures()
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for key in e.iterkeys():
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if element[3].has_key(key):
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element[3][key] = (element[3][key][0] + e[key][0],
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e[key][1])
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else:
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element[3][key] = (e[key][0], e[key][1])
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# Remove the oldest failure attempts from the global list.
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# We iterate the failure list and ban IP that make
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# *retryAllowed* login failures.
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unixTime = time.time()
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for element in logFwList:
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fails = element[3].copy()
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findTime = element[1].getFindTime()
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for attempt in fails:
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failTime = fails[attempt][1]
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if failTime < unixTime - failTime:
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del element[3][attempt]
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elif fails[attempt][0] >= conf["maxretry"]:
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logSys.info(element[0] + ": " + attempt + " has " +
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`element[3][attempt][0]` +
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" login failure(s). Banned.")
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element[2].addBanIP(attempt, conf["debug"])
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del element[3][attempt]
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except KeyboardInterrupt:
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# When the user press <ctrl>+<c> we exit nicely.
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killApp()
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