mirror of https://github.com/fail2ban/fail2ban
147 lines
3.9 KiB
Python
147 lines
3.9 KiB
Python
# 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 re, sre_constants, logging
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from template import Template
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from timetemplate import TimeTemplates
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from prefixtemplate import PrefixTemplates
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from hosttemplate import HostTemplates
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# Gets the instance of the logger.
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logSys = logging.getLogger("fail2ban.filter.failregex")
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class Regex:
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def __init__(self, regex):
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self.__originalRegex = regex
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self.__convertedRegex = None
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self.__compiledRegex = None
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self.__templates = dict()
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self.__hostRegex = None
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self.__dateRegex = None
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self.__prefixRegex = None
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def process(self):
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regex = self.__originalRegex
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for item in self.__templates.values():
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regex = regex.replace(item.getTag(), item.getRegex(), 1)
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try:
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self.__compiledRegex = re.compile(regex)
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self.__convertedRegex = regex
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except sre_constants.error:
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raise RegexException("Unable to compile regular expression '%s'" %
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regex)
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def register(self, template):
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self.__templates[template.getName()] = template
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def getTemplate(self, tag):
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return self.__templates[tag]
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def match(self, line):
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return self.__compiledRegex.match(line)
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def getOriginalRegex(self):
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return self.__originalRegex
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def getConvertedRegex(self):
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return self.__convertedRegex
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class FailRegex:
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HOST_TEMPLATES = HostTemplates()
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PREFIX_TEMPLATES = PrefixTemplates()
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TIME_TEMPLATES = TimeTemplates()
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def __init__(self, regex):
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self.__regex = Regex(regex)
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self.__match = None
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self.__found = False
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def __autoDetection(self, line):
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for host in self.HOST_TEMPLATES.getTemplates():
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self.__regex.register(host)
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for date in self.TIME_TEMPLATES.getTemplates():
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self.__regex.register(date)
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for prefix in self.PREFIX_TEMPLATES.getTemplates():
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self.__regex.register(prefix)
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self.__regex.process()
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match = self.__regex.match(line)
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if match:
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self.__found = True
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#logSys.debug("Auto-detection succeeded")
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#logSys.debug("failregex is %s" %
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# self.__regex.getConvertedRegex())
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return match
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return None
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def search(self, line):
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if self.__found:
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self.__match = self.__regex.match(line)
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else:
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self.__match = self.__autoDetection(line)
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def hasMatched(self):
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if self.__match:
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return True
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else:
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return False
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def getOriginalRegex(self):
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return self.__regex.getOriginalRegex()
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def getHost(self):
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template = self.__regex.getTemplate(Template.TEMPLATE_HOST)
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host = self.__match.group(template.getName())
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if host == None:
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# Gets a few information.
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s = self.__match.string
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r = self.__match.re
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raise RegexException("No 'host' found in '%s' using '%s'" % (s, r))
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return host
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def getTime(self):
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template = self.__regex.getTemplate(Template.TEMPLATE_TIME)
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time = self.__match.group(template.getName())
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if time == None:
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# Gets a few information.
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s = self.__match.string
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r = self.__match.re
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raise RegexException("No 'time' found in '%s' using '%s'" % (s, r))
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try:
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return template.getTime(time)
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except Exception:
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return None
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##
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# Exception dedicated to the class Regex.
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class RegexException(Exception):
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pass
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