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142 lines
3.8 KiB
142 lines
3.8 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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from failmanager import FailManagerEmpty
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from filter import Filter
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from mytime import MyTime
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import time, logging, os
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# Gets the instance of the logger.
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logSys = logging.getLogger("fail2ban.filter")
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##
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# Log reader class.
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#
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# This class reads a log file and detects login failures or anything else
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# that matches a given regular expression. This class is instanciated by
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# a Jail object.
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class FilterPoll(Filter):
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##
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# Constructor.
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#
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# Initialize the filter object with default values.
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# @param jail the jail object
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def __init__(self, jail):
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Filter.__init__(self, jail)
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self.__modified = False
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## The time of the last modification of the file.
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self.__lastModTime = dict()
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self.__file404Cnt = dict()
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logSys.info("Created FilterPoll")
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##
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# Add a log file path
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#
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# @param path log file path
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def addLogPath(self, path):
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if self.containsLogPath(path):
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logSys.error(path + " already exists")
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else:
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self.__lastModTime[path] = 0
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self.__file404Cnt[path] = 0
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Filter.addLogPath(self, path)
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logSys.info("Added logfile = %s" % path)
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##
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# Delete a log path
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#
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# @param path the log file to delete
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def delLogPath(self, path):
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if not self.containsLogPath(path):
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logSys.error(path + " is not monitored")
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else:
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del self.__lastModTime[path]
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del self.__file404Cnt[path]
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Filter.delLogPath(self, path)
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logSys.info("Removed logfile = %s" % path)
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##
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# Main loop.
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#
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# This function is the main loop of the thread. It checks if the
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# file has been modified and looks for failures.
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# @return True when the thread exits nicely
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def run(self):
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self.setActive(True)
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while self._isActive():
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if not self.getIdle():
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# Get file modification
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for f in self.getLogPath():
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if self.isModified(f):
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self.getFailures(f)
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self.__modified = True
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if self.__modified:
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try:
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ticket = self.failManager.toBan()
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self.jail.putFailTicket(ticket)
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except FailManagerEmpty:
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self.failManager.cleanup(MyTime.time())
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self.dateDetector.sortTemplate()
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self.__modified = False
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time.sleep(self.getSleepTime())
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else:
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time.sleep(self.getSleepTime())
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logSys.debug(self.jail.getName() + ": filter terminated")
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return True
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##
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# Checks if the log file has been modified.
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#
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# Checks if the log file has been modified using os.stat().
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# @return True if log file has been modified
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def isModified(self, filename):
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try:
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logStats = os.stat(filename)
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self.__file404Cnt[filename] = 0
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if self.__lastModTime[filename] == logStats.st_mtime:
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return False
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else:
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logSys.debug(filename + " has been modified")
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self.__lastModTime[filename] = logStats.st_mtime
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return True
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except OSError:
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logSys.error("Unable to get stat on " + filename)
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self.__file404Cnt[filename] = self.__file404Cnt[filename] + 1
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if self.__file404Cnt[filename] > 2:
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logSys.warn("Too much read error. Set the jail idle")
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self.jail.setIdle(True)
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self.__file404Cnt[filename] = 0
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return False
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