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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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#
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# Web Crawler.
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#
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# Author:  Efrain Torres   et [at] metasploit.com 2010
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#
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#
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# openssl before rubygems mac os
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require 'openssl'
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require 'pathname'
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require 'uri'
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Report
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'			=> 'Metasploit Web Crawler',
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      'Description'       => 'This auxiliary module is a modular web crawler, to be used in conjunction with wmap (someday) or standalone.',
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      'Author'			=> 'et',
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      'License'			=> MSF_LICENSE
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    ))
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    register_options([
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      OptString.new('PATH',	[true,	"Starting crawling path", '/']),
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      OptInt.new('RPORT', [true, "Remote port", 80 ])
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    ])
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    register_advanced_options([
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      OptPath.new('CrawlerModulesDir', [true,	'The base directory containing the crawler modules',
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        File.join(Msf::Config.data_directory, "msfcrawler")
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      ]),
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      OptBool.new('EnableUl', [ false, "Enable maximum number of request per URI", true ]),
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      OptBool.new('StoreDB', [ false, "Store requests in database", false ]),
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      OptInt.new('MaxUriLimit', [ true, "Number max. request per URI", 10]),
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      OptInt.new('SleepTime', [ true, "Sleep time (secs) between requests", 0]),
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      OptInt.new('TakeTimeout', [ true, "Timeout for loop ending", 15]),
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      OptInt.new('ReadTimeout', [ true, "Read timeout (-1 forever)", 3]),
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      OptInt.new('ThreadNum', [ true, "Threads number", 20]),
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      OptString.new('DontCrawl',	[true,	"Filestypes not to crawl", '.exe,.zip,.tar,.bz2,.run,.asc,.gz'])
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    ])
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  end
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  attr_accessor :ctarget, :cport, :cssl
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  def run
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    i, a = 0, []
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    self.ctarget = datastore['RHOSTS']
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    self.cport = datastore['RPORT']
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    self.cssl = datastore['SSL']
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    inipath = datastore['PATH']
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    cinipath = (inipath.nil? or inipath.empty?) ? '/' : inipath
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    inireq = {
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        'rhost'		=> ctarget,
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        'rport'		=> cport,
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        'uri' 		=> cinipath,
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        'method'   	=> 'GET',
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        'ctype'		=> 'text/plain',
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        'ssl'		=> cssl,
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        'query'		=> nil,
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        'data'		=> nil
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    }
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    @NotViewedQueue = Rinda::TupleSpace.new
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    @ViewedQueue = Hash.new
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    @UriLimits = Hash.new
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    @curent_site = self.ctarget
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    insertnewpath(inireq)
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    print_status("Loading modules: #{datastore['CrawlerModulesDir']}")
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    load_modules(datastore['CrawlerModulesDir'])
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    print_status("OK")
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    if datastore['EnableUl']
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      print_status("URI LIMITS ENABLED: #{datastore['MaxUriLimit']} (Maximum number of requests per uri)")
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    end
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    print_status("Target: #{self.ctarget} Port: #{self.cport} Path: #{cinipath} SSL: #{self.cssl}")
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    begin
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      reqfilter = reqtemplate(self.ctarget,self.cport,self.cssl)
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      i =0
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      loop do
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        ####
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        #if i <= datastore['ThreadNum']
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        #	a.push(Thread.new {
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        ####
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        hashreq = @NotViewedQueue.take(reqfilter, datastore['TakeTimeout'])
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        ul = false
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        if @UriLimits.include?(hashreq['uri']) and datastore['EnableUl']
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          #puts "Request #{@UriLimits[hashreq['uri']]}/#{$maxurilimit} #{hashreq['uri']}"
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          if @UriLimits[hashreq['uri']] >= datastore['MaxUriLimit']
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            #puts "URI LIMIT Reached: #{$maxurilimit} for uri #{hashreq['uri']}"
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            ul = true
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          end
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        else
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          @UriLimits[hashreq['uri']] = 0
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        end
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        if !@ViewedQueue.include?(hashsig(hashreq)) and !ul
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          @ViewedQueue[hashsig(hashreq)] = Time.now
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          @UriLimits[hashreq['uri']] += 1
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          if !File.extname(hashreq['uri']).empty? and datastore['DontCrawl'].include? File.extname(hashreq['uri'])
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            vprint_status "URI not crawled #{hashreq['uri']}"
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          else
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              prx = nil
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              #if self.useproxy
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              #	prx = "HTTP:"+self.proxyhost.to_s+":"+self.proxyport.to_s
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              #end
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              c = Rex::Proto::Http::Client.new(
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                self.ctarget,
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                self.cport.to_i,
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                {},
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                self.cssl,
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                nil,
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                prx
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              )
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              sendreq(c,hashreq)
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          end
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        else
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          vprint_line "#{hashreq['uri']} already visited. "
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        end
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        ####
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        #})
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        #i += 1
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        #else
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        #	sleep(0.01) and a.delete_if {|x| not x.alive?} while not a.empty?
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        #	i = 0
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        #end
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        ####
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      end
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    rescue Rinda::RequestExpiredError
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      print_status("END.")
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      return
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    end
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    print_status("Finished crawling")
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  end
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  def reqtemplate(target,port,ssl)
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    hreq = {
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      'rhost'		=> target,
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      'rport'		=> port,
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      'uri'  		=> nil,
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      'method'   	=> nil,
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      'ctype'		=> nil,
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      'ssl'		=> ssl,
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      'query'		=> nil,
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      'data'		=> nil
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    }
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    return hreq
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  end
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  def storedb(hashreq,response,dbpath)
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    # Added host/port/ssl for report_web_page support
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    info = {
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      :web_site => @current_site,
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      :path     => hashreq['uri'],
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      :query    => hashreq['query'],
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      :host     => hashreq['rhost'],
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      :port     => hashreq['rport'],
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      :ssl      => !hashreq['ssl'].nil?,
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      :data	    => hashreq['data'],
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      :code     => response.code,
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      :body     => response.body,
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      :headers  => response.headers
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    }
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    #if response['content-type']
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    #	info[:ctype] = response['content-type'][0]
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    #end
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    #if response['set-cookie']
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    #	info[:cookie] = page.headers['set-cookie'].join("\n")
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    #end
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    #if page.headers['authorization']
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    #	info[:auth] = page.headers['authorization'].join("\n")
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    #end
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    #if page.headers['location']
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    #	info[:location] = page.headers['location'][0]
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    #end
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    #if page.headers['last-modified']
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    #	info[:mtime] = page.headers['last-modified'][0]
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    #end
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    # Report the web page to the database
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    report_web_page(info)
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  end
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  #
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  # Modified version of load_protocols from psnuffle by Max Moser  <[email protected]>
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  #
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  def load_modules(crawlermodulesdir)
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    base = crawlermodulesdir
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    if (not File.directory?(base))
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      raise RuntimeError,"The Crawler modules parameter is set to an invalid directory"
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    end
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    @crawlermodules = {}
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    cmodules = Dir.new(base).entries.grep(/\.rb$/).sort
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    cmodules.each do |n|
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      f = File.join(base, n)
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      m = ::Module.new
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      begin
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        m.module_eval(File.read(f, File.size(f)))
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        m.constants.grep(/^Crawler(.*)/) do
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          cmod = $1
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          klass = m.const_get("Crawler#{cmod}")
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          @crawlermodules[cmod.downcase] = klass.new(self)
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          print_status("Loaded crawler module #{cmod} from #{f}...")
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        end
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      rescue ::Exception => e
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        print_error("Crawler module #{n} failed to load: #{e.class} #{e} #{e.backtrace}")
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      end
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    end
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  end
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  def sendreq(nclient,reqopts={})
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    begin
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      r = nclient.request_raw(reqopts)
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      resp = nclient.send_recv(r, datastore['ReadTimeout'])
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      if resp
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        #
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        # Quickfix for bug packet.rb to_s line: 190
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        # In case modules or crawler calls to_s on de-chunked responses
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        #
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        resp.transfer_chunked = false
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        if datastore['StoreDB']
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          storedb(reqopts,resp,$dbpathmsf)
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        end
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        print_status ">> [#{resp.code}] #{reqopts['uri']}"
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        if reqopts['query'] and !reqopts['query'].empty?
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          print_status ">>> [Q] #{reqopts['query']}"
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        end
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        if reqopts['data']
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          print_status ">>> [D] #{reqopts['data']}"
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        end
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        case resp.code
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        when 200
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          @crawlermodules.each_key do |k|
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            @crawlermodules[k].parse(reqopts,resp)
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          end
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        when 301..303
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          print_line("[#{resp.code}] Redirection to: #{resp['Location']}")
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          vprint_status urltohash('GET',resp['Location'],reqopts['uri'],nil)
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          insertnewpath(urltohash('GET',resp['Location'],reqopts['uri'],nil))
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        when 404
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          print_status "[404] Invalid link #{reqopts['uri']}"
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        else
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          print_status "Unhandled #{resp.code}"
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        end
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      else
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        print_status "No response"
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      end
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      sleep(datastore['SleepTime'])
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    rescue
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      print_status "ERROR"
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      vprint_status "#{$!}: #{$!.backtrace}"
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    end
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  end
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  #
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  # Add new path (uri) to test non-viewed queue
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  #
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  def insertnewpath(hashreq)
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    hashreq['uri'] = canonicalize(hashreq['uri'])
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    if hashreq['rhost'] == datastore['RHOSTS'] and hashreq['rport'] == datastore['RPORT']
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      if !@ViewedQueue.include?(hashsig(hashreq))
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        if @NotViewedQueue.read_all(hashreq).size > 0
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          vprint_status "Already in queue to be viewed: #{hashreq['uri']}"
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        else
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          vprint_status "Inserted: #{hashreq['uri']}"
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          @NotViewedQueue.write(hashreq)
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        end
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      else
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        vprint_status "#{hashreq['uri']} already visited at #{@ViewedQueue[hashsig(hashreq)]}"
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      end
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    end
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  end
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  #
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  # Build a new hash for a local path
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  #
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  def urltohash(m,url,basepath,dat)
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      # m:   method
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      # url: uri?[query]
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      # basepath: base path/uri to determine absolute path when relative
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      # data: body data, nil if GET and query = uri.query
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      uri = URI.parse(url)
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      uritargetssl = (uri.scheme == "https") ? true : false
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      uritargethost = uri.host
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      if (uri.host.nil? or uri.host.empty?)
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        uritargethost = self.ctarget
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        uritargetssl = self.cssl
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      end
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      uritargetport = uri.port
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      if (uri.port.nil?)
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        uritargetport = self.cport
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      end
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      uritargetpath = uri.path
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      if (uri.path.nil? or uri.path.empty?)
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        uritargetpath = "/"
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      end
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      newp = Pathname.new(uritargetpath)
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      oldp = Pathname.new(basepath)
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      if !newp.absolute?
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        if oldp.to_s[-1,1] == '/'
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          newp = oldp+newp
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        else
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          if !newp.to_s.empty?
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            newp = File.join(oldp.dirname,newp)
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          end
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        end
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      end
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      hashreq = {
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        'rhost'		=> uritargethost,
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        'rport'		=> uritargetport,
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        'uri' 		=> newp.to_s,
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        'method'   	=> m,
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        'ctype'		=> 'text/plain',
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        'ssl'		=> uritargetssl,
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        'query'		=> uri.query,
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        'data'		=> nil
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      }
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      if m == 'GET' and !dat.nil?
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        hashreq['query'] = dat
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      else
380
        hashreq['data'] = dat
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      end
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      return hashreq
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  end
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  # Taken from http://www.ruby-forum.com/topic/140101 by  Rob Biedenharn
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  def canonicalize(uri)
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    u = uri.kind_of?(URI) ? uri : URI.parse(uri.to_s)
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    u.normalize!
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    newpath = u.path
392
    while newpath.gsub!(%r{([^/]+)/\.\./?}) { |match|
393
      $1 == '..' ? match : ''
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    } do end
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    newpath = newpath.gsub(%r{/\./}, '/').sub(%r{/\.\z}, '/')
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    u.path = newpath
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    # Ugly fix
398
    u.path = u.path.gsub("\/..\/","\/")
399
    u.to_s
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  end
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  def hashsig(hashreq)
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    hashreq.to_s
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  end
405
end
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class BaseParser
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  attr_accessor :crawler
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  def initialize(c)
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    self.crawler = c
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  end
413

414
  def parse(request,result)
415
    nil
416
  end
417

418
  #
419
  # Add new path (uri) to test hash queue
420
  #
421
  def insertnewpath(hashreq)
422
    self.crawler.insertnewpath(hashreq)
423
  end
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425
  def hashsig(hashreq)
426
    self.crawler.hashsig(hashreq)
427
  end
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429
  def urltohash(m,url,basepath,dat)
430
    self.crawler.urltohash(m,url,basepath,dat)
431
  end
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433
  def targetssl
434
    self.crawler.cssl
435
  end
436

437
  def targetport
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    self.crawler.cport
439
  end
440

441
  def targethost
442
    self.crawler.ctarget
443
  end
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445
  def targetinipath
446
    self.crawler.cinipath
447
  end
448
end
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