Add support for NewClass elements on Rex::Java::Serialization

[jvazquez-r7]

While working with some complex java serialized streams I noticed some issues because of the lack of "NewClass" objects. This pull request adds support.

Unfortunately I can not share the test cases I'm working with atm.

• With these changes

 tools/java_deserializer.rb request.raw
[*] Deserializing...

@magic: 0xaced
@version: 5
@contents: [
blah
 ]
@references: [
  [7e0000] NewClassDesc { com.util.proxy....
  [7e004c] Utf { blahblah }
]

• From master

$ tools/java_deserializer.rb request.raw
[*] Deserializing...

[-] undefined method `class_name' for #<Rex::Java::Serialization::Model::NewArray:0x007feb209096e8>
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:117:in `array_type'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:38:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:33:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:127:in `block in decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `each'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:109:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:40:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:29:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:127:in `block in decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `each'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:109:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:40:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:29:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:127:in `block in decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `each'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:109:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:105:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:37:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:29:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:127:in `block in decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `each'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:109:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:105:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:37:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:29:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:185:in `decode_value'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:43:in `block in decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:42:in `times'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_array.rb:42:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:33:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:127:in `block in decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `each'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:123:in `decode_class_fields'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:109:in `decode_class_data'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/new_object.rb:37:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/contents.rb:29:in `decode_content'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/stream.rb:43:in `decode'
    /Users/jvazquez/Projects/Code/metasploit-framework/lib/rex/java/serialization/model/element.rb:18:in `decode'
    tools/java_deserializer.rb:46:in `run'
    tools/java_deserializer.rb:167:in `<main>'

Verification

• specs should be green