CasperSecurity
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
# vi: set ft=python sts=4 ts=4 sw=4 noet :
# This file is part of Fail2Ban.
#
# Fail2Ban is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Fail2Ban is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Fail2Ban; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
# Author: Cyril Jaquier
#
__author__ = "Cyril Jaquier"
__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
__license__ = "GPL"
from threading import Lock
import logging
from .ticket import FailTicket, BanTicket
from ..helpers import getLogger, BgService
# Gets the instance of the logger.
logSys = getLogger(__name__)
logLevel = logging.DEBUG
class FailManager:
def __init__(self):
self.__lock = Lock()
self.__failList = dict()
self.__maxRetry = 3
self.__maxTime = 600
self.__failTotal = 0
self.maxMatches = 5
self.__bgSvc = BgService()
def setFailTotal(self, value):
self.__failTotal = value
def getFailTotal(self):
return self.__failTotal
def getFailCount(self):
# may be slow on large list of failures, should be used for test purposes only...
with self.__lock:
return len(self.__failList), sum([f.getRetry() for f in list(self.__failList.values())])
def setMaxRetry(self, value):
self.__maxRetry = value
def getMaxRetry(self):
return self.__maxRetry
def setMaxTime(self, value):
self.__maxTime = value
def getMaxTime(self):
return self.__maxTime
def addFailure(self, ticket, count=1, observed=False):
attempts = 1
with self.__lock:
fid = ticket.getID()
try:
fData = self.__failList[fid]
# if the same object - the same matches but +1 attempt:
if fData is ticket:
matches = None
attempt = 1
else:
# will be incremented / extended (be sure we have at least +1 attempt):
matches = ticket.getMatches() if self.maxMatches else None
attempt = ticket.getAttempt()
if attempt <= 0:
attempt += 1
unixTime = ticket.getTime()
fData.adjustTime(unixTime, self.__maxTime)
fData.inc(matches, attempt, count)
# truncate to maxMatches:
if self.maxMatches:
matches = fData.getMatches()
if len(matches) > self.maxMatches:
fData.setMatches(matches[-self.maxMatches:])
else:
fData.setMatches(None)
except KeyError:
# not found - already banned - prevent to add failure if comes from observer:
if observed or isinstance(ticket, BanTicket):
return ticket.getRetry()
# if already FailTicket - add it direct, otherwise create (using copy all ticket data):
if isinstance(ticket, FailTicket):
fData = ticket;
else:
fData = FailTicket.wrap(ticket)
if count > ticket.getAttempt():
fData.setRetry(count)
self.__failList[fid] = fData
attempts = fData.getRetry()
self.__failTotal += 1
if logSys.getEffectiveLevel() <= logLevel:
# yoh: Since composing this list might be somewhat time consuming
# in case of having many active failures, it should be ran only
# if debug level is "low" enough
failures_summary = ', '.join(['%s:%d' % (k, v.getRetry())
for k,v in self.__failList.items()])
logSys.log(logLevel, "Total # of detected failures: %d. Current failures from %d IPs (IP:count): %s"
% (self.__failTotal, len(self.__failList), failures_summary))
self.__bgSvc.service()
return attempts
def size(self):
return len(self.__failList)
def cleanup(self, time):
with self.__lock:
todelete = [fid for fid,item in self.__failList.items() \
if item.getTime() + self.__maxTime <= time]
if len(todelete) == len(self.__failList):
# remove all:
self.__failList = dict()
elif not len(todelete):
# nothing:
return
if len(todelete) / 2.0 <= len(self.__failList) / 3.0:
# few as 2/3 should be removed - remove particular items:
for fid in todelete:
del self.__failList[fid]
else:
# create new dictionary without items to be deleted:
self.__failList = dict((fid,item) for fid,item in self.__failList.items() \
if item.getTime() + self.__maxTime > time)
self.__bgSvc.service()
def delFailure(self, fid):
with self.__lock:
try:
del self.__failList[fid]
except KeyError:
pass
def toBan(self, fid=None):
with self.__lock:
for fid in ([fid] if fid is not None and fid in self.__failList else self.__failList):
data = self.__failList[fid]
if data.getRetry() >= self.__maxRetry:
del self.__failList[fid]
return data
self.__bgSvc.service()
raise FailManagerEmpty
class FailManagerEmpty(Exception):
pass