Update the YSoSerial Dockerfile and remove runme

Remove the runme script because we should no longer be updating all of
the gadget chains at once because doing so would require that quite a
few different modules be updated. Moving forward we should be updating
individual chains using an incremental approach to allow us to validate
the results of the find_ysoserial_offsets tool which is error prone.

Author: zeroSteiner

tools/payloads/ysoserial/Dockerfile

@@ -30,4 +30,4 @@ RUN gem install --silent diff-lcs:1.4.4 json pry
 
 COPY find_ysoserial_offsets.rb /
 
-CMD ruby /find_ysoserial_offsets.rb -a
+ENTRYPOINT ["ruby", "/find_ysoserial_offsets.rb"]

tools/payloads/ysoserial/find_ysoserial_offsets.rb

@@ -15,8 +15,7 @@
 
 @debug = false
 @generate_all = false
-@payload_type = nil
-@ysoserial_modified = false
+@payload_type = YSOSERIAL_UNMODIFIED_TYPE
 @ysoserial_payloads = []
 @json_document = {}
 OptionParser.new do |opts|
@@ -36,7 +35,6 @@
   end
 
   opts.on('-m', '--modified [TYPE]', String, 'Use \'ysoserial-modified\' with the specified payload type') do |modified_type|
-    @ysoserial_modified = true
     @payload_type = modified_type
   end
 
@@ -54,10 +52,10 @@ def generate_payload(payload_name, search_string_length)
   search_string = 'A' * search_string_length
 
   # Build the command line with ysoserial parameters
-  if @ysoserial_modified
-    stdout, stderr, _status = Open3.capture3('java', '-jar', 'ysoserial-modified.jar', payload_name, @payload_type, search_string)
-  else
+  if @payload_type == YSOSERIAL_UNMODIFIED_TYPE
     stdout, stderr, _status = Open3.capture3('java', '-jar', 'ysoserial-original.jar', payload_name, search_string)
+  else
+    stdout, stderr, _status = Open3.capture3('java', '-jar', 'ysoserial-modified.jar', payload_name, @payload_type, search_string)
   end
 
   payload = stdout
@@ -231,14 +229,12 @@ def generated_ysoserial_payloads
 if @generate_all
   YSOSERIAL_ALL_TYPES.each do |type|
     warn "Generating payload type for #{type}..."
-    @ysoserial_modified = (type != YSOSERIAL_UNMODIFIED_TYPE)
     @payload_type = type
     @json_document[type] ||= {}
     @json_document[type].merge!(generated_ysoserial_payloads)
     $stderr.puts
   end
 else
-  @payload_type ||= YSOSERIAL_UNMODIFIED_TYPE
   @json_document[@payload_type] ||= {}
   @json_document[@payload_type].merge!(generated_ysoserial_payloads)
 end