'''
mxInjection.py

Copyright 2006 Andres Riancho

This file is part of w3af, w3af.sourceforge.net .

w3af 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 version 2 of the License.

w3af 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 w3af; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

'''

from core.data.fuzzer.fuzzer import *
import core.controllers.outputManager as om
from core.controllers.basePlugin.baseAuditPlugin import baseAuditPlugin
import core.data.kb.knowledgeBase as kb
from core.controllers.w3afException import w3afException
import core.data.kb.vuln as vuln

class mxInjection(baseAuditPlugin):
	'''
	This plugin tests for MX injection bugs.
	@author: Andres Riancho ( andres.riancho@gmail.com )
	'''

	'''
	Plugin added just for completeness... I dont really expect to find one of this bugs
	in my life... but well.... if someone , somewhere in the planet ever finds a bug of using
	this plugin... THEN my job has been done :P
	'''
	
	def __init__(self):
		baseAuditPlugin.__init__(self)

	def _fuzzRequests(self, freq ):
		'''
		Tests an URL for mx injection vulnerabilities.
		
		@param freq: A fuzzableRequest
		'''
		om.out.debug( 'mxInjection plugin is testing: ' + freq.getURL() )
		
		mxInjectionStrings = self._getmxInjectionStrings()
		mutants = createMutants( freq , mxInjectionStrings )
			
		for mutant in mutants:
			if self._hasNoBug( 'mxInjection' , 'mxInjection' , mutant.getURL() , mutant.getVar() ):
				# Only spawn a thread if the mutant has a modified variable
				# that has no reported bugs in the kb
				targs = (mutant,)
				self._tm.startFunction( target=self._sendMutant, args=targs, ownerObj=self )
		
			
	def _analyzeResult( self, mutant, response ):
		'''
		Analyze results of the _sendMutant method.
		'''
		if self._findmxError( response.getBody() ):
			v = vuln.vuln( mutant )
			v.setDesc( 'MX injection was found at: ' + response.getURL() + ' . Using method: ' + v.getMethod() + '. The data sent was: ' + str(mutant.getDc()) )
			v.setId( response.id )
			kb.kb.append( self, 'mxInjection', v )
	
	def end(self):
		'''
		This method is called when the plugin wont be used anymore.
		'''
		self._tm.join( self )
		self.printUniq( kb.kb.getData( 'mxInjection', 'mxInjection' ), 'VAR' )
	
	def _getmxInjectionStrings( self ):
		'''
		Gets a list of strings to test against the web app.
		
		@return: A list with all mxInjection strings to test. Example: [ '\"','f00000']
		'''
		mxInjectionStrings = []
		mxInjectionStrings.append('"')
		mxInjectionStrings.append('iDontExist')
		mxInjectionStrings.append('')
		return mxInjectionStrings

	def _findmxError( self, htmlString ):
		'''
		This method searches for mx errors in html's.
		
		@parameter htmlString: The html string where the method searches for mx errors
		@return: True if a mx was found on the site, False otherwise.
		'''
		mxErrors = self._getmxErrors()

		for mxError in mxErrors:
			position = htmlString.find( mxError )
			if  position != -1:
				om.out.vulnerability('Found mx injection. The error showed by the Web App is (fragment): "' + htmlString[ position - 20 : position + 20]  + '".')
				return True
		return False

	def _getmxErrors(self):
		errors = []
		
		errors.append( 'Unexpected extra arguments to Select' )
		errors.append( 'Bad or malformed request' )		
		errors.append( 'Could not access the following folders' )		
		errors.append( 'To check for outside changes to the folder list go to the folders page' )		
		errors.append( 'A000' )		
		errors.append( 'A001' )		
		errors.append( 'Invalid mailbox name' )		
		
		return errors
		
	def getOptionsXML(self):
		'''
		This method returns a XML containing the Options that the plugin has.
		Using this XML the framework will build a window, a menu, or some other input method to retrieve
		the info from the user. The XML has to validate against the xml schema file located at :
		w3af/core/ui/userInterface.dtd
		
		@return: XML with the plugin options.
		'''	
		return	'<?xml version="1.0" encoding="ISO-8859-1"?>\
		<OptionList>\
		</OptionList>\
		'

	def setOptions( self, OptionList ):
		'''
		This method sets all the options that are configured using the user interface 
		generated by the framework using the result of getOptionsXML().
		
		@parameter OptionList: A dictionary with the options for the plugin.
		@return: No value is returned.
		'''	
		pass

	def getPluginDeps( self ):
		'''
		@return: A list with the names of the plugins that should be runned before the
		current one.
		'''
		return []
	
	def getLongDesc( self ):
		'''
		@return: A DETAILED description of the plugin functions and features.
		'''
		return '''
		This plugin will find MX injections. This kind of web application errors are mostly seen in webmail software.
		The tests are simple, for every injectable parameter a string with special meaning in the mail server is sent, and if
		in the response I find a mail server error, a vulnerability was found.
		'''