Burp community forum

Automatically Change Response

Pascal | Last updated: Jun 27, 2018 02:23PM UTC

Hi, I am currently developing a Burp plugin in python and do have a problem for which I don't have a solution. I basically want to automatically change the response but I do have a plugin in between that decodes my binary. What I have achieved until now is that I see my decoded message as a new tab in the proxy and target view. I can also manipulate the response by intercepting it first and then change whatever I want manually (this works through implementing IMessageEditorTab's getMessage). However, I would want to change that data in my decoded message on the fly without the need to manually operate. It all sums up to Burp's Proxy - Options - Match and Replace functionality BUT on top of my decoded message. Does anyone have advice on how to do that? I don't seem to find the correct interface / method to achieve that. Thanks, Pascal

PortSwigger Agent | Last updated: Jun 27, 2018 02:26PM UTC

Hi Pascal, It sounds like the IHttpListener interface would be suitable. You can provide a processHttpMessage method which is called each time a request or response is sent to/from Burp. You may be interested in the FastInfoSet Tester BApp which does something similar: - https://github.com/portswigger/fast-infoset-tester Please let us know if you need any further assistance.

Burp User | Last updated: Jun 28, 2018 12:42PM UTC

Hi Paul, thanks for your insanely quick answer. I think I managed to do what I wanted to in the beginning. The interface you specified was the one I was searching for. Hope, I can finish my plugin soon. Will come back in case I have another question. Best, Pascal

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