mirror of https://github.com/fail2ban/fail2ban
203 lines
6.2 KiB
Python
203 lines
6.2 KiB
Python
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
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# vi: set ft=python sts=4 ts=4 sw=4 noet :
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# Author: Cyril Jaquier
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#
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__author__ = "Cyril Jaquier"
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__copyright__ = "Copyright (c) 2004 Cyril Jaquier"
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__license__ = "GPL"
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import logging, re, glob
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from configreader import ConfigReader
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from filterreader import FilterReader
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from actionreader import ActionReader
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# Gets the instance of the logger.
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logSys = logging.getLogger("fail2ban.client.config")
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class JailReader(ConfigReader):
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actionCRE = re.compile("^((?:\w|-|_|\.)+)(?:\[(.*)\])?$")
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def __init__(self, name, force_enable=False, **kwargs):
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ConfigReader.__init__(self, **kwargs)
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self.__name = name
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self.__filter = None
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self.__force_enable = force_enable
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self.__actions = list()
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def setName(self, value):
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self.__name = value
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def getName(self):
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return self.__name
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def read(self):
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return ConfigReader.read(self, "jail")
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def isEnabled(self):
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return self.__force_enable or self.__opts["enabled"]
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def getOptions(self):
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opts = [["bool", "enabled", "false"],
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["string", "logpath", "/var/log/messages"],
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["string", "backend", "auto"],
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["int", "maxretry", 3],
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["int", "findtime", 600],
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["int", "bantime", 600],
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["string", "usedns", "warn"],
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["string", "failregex", None],
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["string", "ignoreregex", None],
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["string", "ignoreip", None],
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["string", "filter", ""],
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["string", "action", ""]]
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self.__opts = ConfigReader.getOptions(self, self.__name, opts)
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if self.isEnabled():
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# Read filter
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self.__filter = FilterReader(self.__opts["filter"], self.__name,
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basedir=self.getBaseDir())
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ret = self.__filter.read()
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if ret:
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self.__filter.getOptions(self.__opts)
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else:
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logSys.error("Unable to read the filter")
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return False
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# Read action
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for act in self.__opts["action"].split('\n'):
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try:
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if not act: # skip empty actions
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continue
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splitAct = JailReader.splitAction(act)
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action = ActionReader(splitAct, self.__name, basedir=self.getBaseDir())
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ret = action.read()
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if ret:
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action.getOptions(self.__opts)
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self.__actions.append(action)
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else:
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raise AttributeError("Unable to read action")
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except Exception, e:
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logSys.error("Error in action definition " + act)
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logSys.debug("Caught exception: %s" % (e,))
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return False
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if not len(self.__actions):
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logSys.warn("No actions were defined for %s" % self.__name)
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return True
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def convert(self, allow_no_files=False):
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"""Convert read before __opts to the commands stream
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Parameters
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----------
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allow_missing : bool
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Either to allow log files to be missing entirely. Primarily is
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used for testing
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"""
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stream = []
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for opt in self.__opts:
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if opt == "logpath":
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found_files = 0
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for path in self.__opts[opt].split("\n"):
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pathList = glob.glob(path)
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if len(pathList) == 0:
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logSys.error("No file(s) found for glob %s" % path)
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for p in pathList:
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found_files += 1
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stream.append(["set", self.__name, "addlogpath", p])
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if not (found_files or allow_no_files):
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raise ValueError(
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"Have not found any log file for %s jail" % self.__name)
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elif opt == "backend":
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backend = self.__opts[opt]
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elif opt == "maxretry":
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stream.append(["set", self.__name, "maxretry", self.__opts[opt]])
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elif opt == "ignoreip":
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for ip in self.__opts[opt].split():
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# Do not send a command if the rule is empty.
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if ip != '':
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stream.append(["set", self.__name, "addignoreip", ip])
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elif opt == "findtime":
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stream.append(["set", self.__name, "findtime", self.__opts[opt]])
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elif opt == "bantime":
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stream.append(["set", self.__name, "bantime", self.__opts[opt]])
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elif opt == "usedns":
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stream.append(["set", self.__name, "usedns", self.__opts[opt]])
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elif opt == "failregex":
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stream.append(["set", self.__name, "addfailregex", self.__opts[opt]])
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elif opt == "ignoreregex":
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for regex in self.__opts[opt].split('\n'):
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# Do not send a command if the rule is empty.
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if regex != '':
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stream.append(["set", self.__name, "addignoreregex", regex])
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stream.extend(self.__filter.convert())
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for action in self.__actions:
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stream.extend(action.convert())
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stream.insert(0, ["add", self.__name, backend])
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return stream
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#@staticmethod
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def splitAction(action):
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m = JailReader.actionCRE.match(action)
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d = dict()
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mgroups = m.groups()
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if len(mgroups) == 2:
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action_name, action_opts = mgroups
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elif len(mgroups) == 1:
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action_name, action_opts = mgroups[0], None
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else:
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raise ValueError("While reading action %s we should have got up to "
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"2 groups. Got: %r" % (action, mgroups))
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if not action_opts is None:
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# Huge bad hack :( This method really sucks. TODO Reimplement it.
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actions = ""
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escapeChar = None
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allowComma = False
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for c in action_opts:
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if c in ('"', "'") and not allowComma:
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# Start
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escapeChar = c
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allowComma = True
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elif c == escapeChar:
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# End
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escapeChar = None
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allowComma = False
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else:
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if c == ',' and allowComma:
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actions += "<COMMA>"
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else:
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actions += c
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# Split using ,
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actionsSplit = actions.split(',')
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# Replace the tag <COMMA> with ,
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actionsSplit = [n.replace("<COMMA>", ',') for n in actionsSplit]
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for param in actionsSplit:
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p = param.split('=')
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try:
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d[p[0].strip()] = p[1].strip()
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except IndexError:
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logSys.error("Invalid argument %s in '%s'" % (p, action_opts))
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return [action_name, d]
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splitAction = staticmethod(splitAction)
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