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133 lines
3.7 KiB
133 lines
3.7 KiB
# 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 os, sys, time, re
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class LogReader:
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""" Reads a log file and reports information about IP that make password
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failure, bad user or anything else that is considered as doubtful login
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attempt.
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"""
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def __init__(self, logSys, logPath, timeregex, timepattern, failregex, findTime = 3600):
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self.logPath = logPath
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self.timeregex = timeregex
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self.timepattern = timepattern
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self.failregex = failregex
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self.findTime = findTime
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self.ignoreIpList = []
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self.lastModTime = 0
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self.logSys = logSys
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def addIgnoreIP(self, ip):
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""" Adds an IP to the ignore list.
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"""
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self.logSys.debug("Add "+ip+" to ignore list")
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self.ignoreIpList.append(ip)
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def inIgnoreIPList(self, ip):
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""" Checks if IP is in the ignore list.
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"""
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return ip in self.ignoreIpList
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def openLogFile(self):
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""" Opens the log file specified on init.
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"""
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try:
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fileHandler = open(self.logPath)
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except OSError:
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self.logSys.error("Unable to open "+self.logPath)
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sys.exit(-1)
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return fileHandler
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def isModified(self):
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""" Checks if the log file has been modified using os.stat().
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"""
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try:
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logStats = os.stat(self.logPath)
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except OSError:
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self.logSys.error("Unable to get stat on "+self.logPath)
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sys.exit(-1)
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if self.lastModTime == logStats.st_mtime:
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return False
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else:
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self.logSys.debug(self.logPath+" has been modified")
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self.lastModTime = logStats.st_mtime
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return True
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def getFailures(self):
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ipList = dict()
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logFile = self.openLogFile()
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for line in logFile.readlines():
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value = self.findFailure(line)
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if value:
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ip = value[0]
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unixTime = value[1]
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if unixTime < time.time()-self.findTime:
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continue
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if self.inIgnoreIPList(ip):
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self.logSys.debug("Ignore "+ip)
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continue
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self.logSys.debug("Found "+ip)
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if ipList.has_key(ip):
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ipList[ip] = (ipList[ip][0]+1, unixTime)
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else:
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ipList[ip] = (1, unixTime)
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logFile.close()
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return ipList
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def findFailure(self, line):
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match = self.matchLine(line, self.failregex)
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if match:
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timeMatch = self.matchLine(match.string, self.timeregex)
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if timeMatch:
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date = self.getUnixTime(timeMatch.group(), self.timepattern)
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ipMatch = self.matchAddress(match.string)
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if ipMatch:
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ip = ipMatch.group()
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return [ip, date]
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return None
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def getUnixTime(self, value, pattern):
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date = list(time.strptime(value, pattern))
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if date[0] < 2000:
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date[0] = time.gmtime()[0]
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unixTime = time.mktime(date)
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return unixTime
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def matchLine(self, line, pattern):
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""" Checks if the line contains a pattern. It does this for all
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classes specified in *parserList*. We use a singleton to avoid
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creating/destroying objects too much.
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Return a dict with the IP and number of retries.
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"""
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return re.search(pattern, line)
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def matchAddress(self, line):
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return re.search("(?:\d{1,3}\.){3}\d{1,3}", line)
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