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Current File : /usr/lib/python3/dist-packages/fail2ban/client/jailreader.py
# 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"

import glob
import json
import os.path
import re

from .configreader import ConfigReaderUnshared, ConfigReader
from .filterreader import FilterReader
from .actionreader import ActionReader
from ..version import version
from ..helpers import getLogger, extractOptions, splitWithOptions, splitwords

# Gets the instance of the logger.
logSys = getLogger(__name__)


class JailReader(ConfigReader):
	
	def __init__(self, name, force_enable=False, **kwargs):
		ConfigReader.__init__(self, **kwargs)
		self.__name = name
		self.__filter = None
		self.__force_enable = force_enable
		self.__actions = list()
		self.__opts = None
	
	@property
	def options(self):
		return self.__opts

	def setName(self, value):
		self.__name = value
	
	def getName(self):
		return self.__name
	
	def read(self):
		out = ConfigReader.read(self, "jail")
		# Before returning -- verify that requested section
		# exists at all
		if not (self.__name in self.sections()):
			raise ValueError("Jail %r was not found among available"
							 % self.__name)
		return out
	
	def isEnabled(self):
		return self.__force_enable or (
			self.__opts and self.__opts.get("enabled", False))

	@staticmethod
	def _glob(path):
		"""Given a path for glob return list of files to be passed to server.

		Dangling symlinks are warned about and not returned
		"""
		pathList = []
		for p in glob.glob(path):
			if os.path.exists(p):
				pathList.append(p)
			else:
				logSys.warning("File %s is a dangling link, thus cannot be monitored" % p)
		return pathList

	_configOpts1st = {
		"enabled": ["bool", False],
		"backend": ["string", "auto"],
		"filter": ["string", ""]
	}
	_configOpts = {
		"enabled": ["bool", False],
		"backend": ["string", "auto"],
		"maxretry": ["int", None],
		"maxmatches": ["int", None],
		"findtime": ["string", None],
		"bantime": ["string", None],
		"bantime.increment": ["bool", None],
		"bantime.factor": ["string", None],
		"bantime.formula": ["string", None],
		"bantime.multipliers": ["string", None],
		"bantime.maxtime": ["string", None],
		"bantime.rndtime": ["string", None],
		"bantime.overalljails": ["bool", None],
		"ignorecommand": ["string", None],
		"ignoreself": ["bool", None],
		"ignoreip": ["string", None],
		"ignorecache": ["string", None],
		"filter": ["string", ""],
		"logtimezone": ["string", None],
		"logencoding": ["string", None],
		"logpath": ["string", None],
		"action": ["string", ""]
	}
	_configOpts.update(FilterReader._configOpts)

	_ignoreOpts = set(['action', 'filter', 'enabled'] + list(FilterReader._configOpts.keys()))

	def getOptions(self):

		# Before interpolation (substitution) add static options always available as default:
		self.merge_defaults({
			"fail2ban_version": version
		})

		try:

			# Read first options only needed for merge defaults ('known/...' from filter):
			self.__opts = ConfigReader.getOptions(self, self.__name, self._configOpts1st,
				shouldExist=True)
			if not self.__opts: # pragma: no cover
				raise JailDefError("Init jail options failed")
		
			if not self.isEnabled():
				return True
				
			# Read filter
			flt = self.__opts["filter"]
			if flt:
				filterName, filterOpt = extractOptions(flt)
				if not filterName:
					raise JailDefError("Invalid filter definition %r" % flt)
				self.__filter = FilterReader(
					filterName, self.__name, filterOpt, 
					share_config=self.share_config, basedir=self.getBaseDir())
				ret = self.__filter.read()
				if not ret:
					raise JailDefError("Unable to read the filter %r" % filterName)
				# set backend-related options (logtype):
				self.__filter.applyAutoOptions(self.__opts.get('backend', ''))
				# merge options from filter as 'known/...' (all options unfiltered):
				self.__filter.getOptions(self.__opts, all=True)
				ConfigReader.merge_section(self, self.__name, self.__filter.getCombined(), 'known/')
			else:
				self.__filter = None
				logSys.warning("No filter set for jail %s" % self.__name)

			# Read second all options (so variables like %(known/param) can be interpolated):
			self.__opts = ConfigReader.getOptions(self, self.__name, self._configOpts)
			if not self.__opts: # pragma: no cover
				raise JailDefError("Read jail options failed")
		
			# cumulate filter options again (ignore given in jail):
			if self.__filter:
				self.__filter.getOptions(self.__opts)
		
			# Read action
			for act in splitWithOptions(self.__opts["action"]):
				try:
					act = act.strip()
					if not act:			  # skip empty actions
						continue
					# join with previous line if needed (consider possible new-line):
					actName, actOpt = extractOptions(act)
					prevln = ''
					if not actName:
						raise JailDefError("Invalid action definition %r" % act)
					if actName.endswith(".py"):
						self.__actions.append([
							"set",
							self.__name,
							"addaction",
							actOpt.pop("actname", os.path.splitext(actName)[0]),
							os.path.join(
								self.getBaseDir(), "action.d", actName),
							json.dumps(actOpt),
							])
					else:
						action = ActionReader(
							actName, self.__name, actOpt,
							share_config=self.share_config, basedir=self.getBaseDir())
						ret = action.read()
						if ret:
							action.getOptions(self.__opts)
							self.__actions.append(action)
						else:
							raise JailDefError("Unable to read action %r" % actName)
				except JailDefError:
					raise
				except Exception as e:
					logSys.debug("Caught exception: %s", e, exc_info=True)
					raise ValueError("Error in action definition %r: %r" % (act, e))
			if not len(self.__actions):
				logSys.warning("No actions were defined for %s" % self.__name)
			
		except JailDefError as e:
			e = str(e)
			logSys.error(e)
			if not self.__opts:
				self.__opts = dict()
			self.__opts['config-error'] = e
			return False
		return True
	
	def convert(self, allow_no_files=False):
		"""Convert read before __opts to the commands stream

		Parameters
		----------
		allow_missing : bool
		  Either to allow log files to be missing entirely.  Primarily is
		  used for testing
		 """

		stream = []
		stream2 = []
		e = self.__opts.get('config-error')
		if e:
			stream.extend([['config-error', "Jail '%s' skipped, because of wrong configuration: %s" % (self.__name, e)]])
			return stream
		# fill jail with filter options, using filter (only not overriden in jail):
		if self.__filter:
			stream.extend(self.__filter.convert())
		# and using options from jail:
		FilterReader._fillStream(stream, self.__opts, self.__name)
		for opt, value in self.__opts.items():
			if opt == "logpath":
				if self.__opts.get('backend', '').startswith("systemd"): continue
				found_files = 0
				for path in value.split("\n"):
					path = path.rsplit(" ", 1)
					path, tail = path if len(path) > 1 else (path[0], "head")
					pathList = JailReader._glob(path)
					if len(pathList) == 0:
						logSys.notice("No file(s) found for glob %s" % path)
					for p in pathList:
						found_files += 1
						# logpath after all log-related data (backend, date-pattern, etc)
						stream2.append(
							["set", self.__name, "addlogpath", p, tail])
				if not found_files:
					msg = "Have not found any log file for %s jail" % self.__name
					if not allow_no_files:
						raise ValueError(msg)
					logSys.warning(msg)
			elif opt == "backend":
				backend = value
			elif opt == "ignoreip":
				stream.append(["set", self.__name, "addignoreip"] + splitwords(value))
			elif opt not in JailReader._ignoreOpts:
				stream.append(["set", self.__name, opt, value])
		# consider options order (after other options):
		if stream2: stream += stream2
		for action in self.__actions:
			if isinstance(action, (ConfigReaderUnshared, ConfigReader)):
				stream.extend(action.convert())
			else:
				stream.append(action)
		stream.insert(0, ["add", self.__name, backend])
		return stream
	
class JailDefError(Exception):
	pass

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