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#!/usr/bin/env ruby
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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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begin
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msf_base = __FILE__
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while File.symlink?(msf_base)
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  msf_base = File.expand_path(File.readlink(msf_base), File.dirname(msf_base))
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end
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$:.unshift(File.expand_path(File.join(File.dirname(msf_base), '..', '..', 'lib')))
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require 'rex/java/serialization'
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require 'pp'
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require 'optparse'
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# This class allows to deserialize Java Streams from
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# files
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class JavaDeserializer
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  # @!attribute file
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  #   @return [String] the file's path to deserialize
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  attr_accessor :file
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  # @param file [String] the file's path to deserialize
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  def initialize(file = nil)
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    self.file = file
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  end
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  # Deserializes a Java stream from a file and prints the result.
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  #
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  # @return [Rex::Java::Serialization::Model::Stream] if succeeds
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  # @return [nil] if error
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  def run(options = {})
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    if file.nil?
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      print_error("file path with serialized java stream required")
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      return
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    end
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    print_status("Deserializing...")
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    print_line
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    begin
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      f = File.new(file, 'rb')
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      stream = Rex::Java::Serialization::Model::Stream.decode(f)
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      f.close
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    rescue ::Exception => e
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      print_exception(e)
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      return
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    end
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    if options[:array]
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      print_array(stream.contents[options[:array].to_i])
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    elsif options[:object]
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      print_object(stream.contents[options[:object].to_i])
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    else
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      puts stream
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    end
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  end
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  private
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  # @param msg [String] String to print as a status message.
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  def print_status(msg='')
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    $stdout.puts "[*] #{msg}"
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  end
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  # @param msg [String] String to print as a error message.
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  def print_error(msg='')
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    $stdout.puts "[-] #{msg}"
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  end
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  # @param e [Exception] Exception to print
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  def print_exception(e)
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    print_error(e.message)
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    e.backtrace.each do |line|
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      $stdout.puts("\t#{line}")
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    end
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  end
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  def print_line
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    $stdout.puts("\n")
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  end
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  # @param [Rex::Java::Serialization::Model::NewObject] obj the object to print
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  # @param [Integer] level the indentation level when printing super classes
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  def print_object(obj, level = 0)
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    prefix = "  " * level
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    if obj.class_desc.description.class == Rex::Java::Serialization::Model::NewClassDesc
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      puts "#{prefix}Object Class Description:"
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      print_class(obj.class_desc.description, level + 1)
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    else
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      puts "#{prefix}Object Class Description: #{obj.class_desc.description}"
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    end
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    puts "#{prefix}Object Data: #{obj.class_data}"
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  end
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  # @param [Rex::Java::Serialization::Model::NewClassDesc] c the class to print
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  # @param [Integer] level the indentation level when printing super classes
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  def print_class(c, level = 0)
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    prefix = "  " * level
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    puts "#{prefix}Class Name: #{c.class_name}"
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    puts "#{prefix}Serial Version: #{c.serial_version}"
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    puts "#{prefix}Flags: #{c.flags}"
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    puts "#{prefix}Fields ##{c.fields.length}"
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    c.fields.each do |f|
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      puts "#{prefix}Field: #{f}"
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    end
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    puts "#{prefix}Class Annotations ##{c.class_annotation.contents.length}"
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    c.class_annotation.contents.each do |c|
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      puts "#{prefix}Annotation: #{c}"
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    end
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    puts "#{prefix}Super Class: #{c.super_class}"
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    if c.super_class.description.class == Rex::Java::Serialization::Model::NewClassDesc
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      print_class(c.super_class.description, level + 1)
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    end
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  end
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  # @param [Rex::Java::Serialization::Model::NewArray] arr the array to print
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  # @param [Integer] level the indentation level when printing super classes
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  def print_array(arr, level = 0)
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    prefix = "  " * level
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    if arr.array_description.description.class == Rex::Java::Serialization::Model::NewClassDesc
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      puts "#{prefix}Array Description"
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      print_class(arr.array_description.description, 1)
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    else
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      puts "#{prefix}Array Description: #{arr.array_description.description}"
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    end
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    puts "#{prefix}Array Type: #{arr.type}"
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    puts "#{prefix}Array Values ##{arr.values.length}"
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    arr.values.each do |v|
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      puts "Array value: #{prefix}#{v} (#{v.class})"
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      if v.class == Rex::Java::Serialization::Model::NewObject
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        print_object(v, level + 1)
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      end
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    end
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  end
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end
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if __FILE__ == $PROGRAM_NAME
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  options = {}
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  OptionParser.new do |opts|
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    opts.banner = "Usage: java_deserializer.rb <file> [option]"
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    opts.on("-aID", "--array=ID", "Print detailed information about content array") do |id|
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      options[:array] = id
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    end
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    opts.on("-oID", "--object=ID", "Print detailed information about content object") do |id|
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      options[:object] = id
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    end
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    opts.on("-h", "--help", "Prints this help") do
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      puts opts
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      exit
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    end
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  end.parse!
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  if options.length > 1
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    $stdout.puts "[-] Don't provide more than one option"
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    exit
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  end
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  deserializer = JavaDeserializer.new(ARGV[0])
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  deserializer.run(options)
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end
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rescue SignalException => e
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  puts("Aborted! #{e}")
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end
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