5/17/2023 0 Comments Burp suite api testing![]() ![]() If you still need to read that, I recommend doing it. If you are a follower of my blog, you might recall my article about attacking predictable GUIDs. Now that you have your first extension done, let’s build something together that is useful when hacking APIs. Congratulations! Building a valuable extension for API pentesting If something goes wrong, you can check the Errors tab.Īt this point, you have the first custom extension you’ve ever written running in BurpSuite. If everything works, you will see your text in the Output tab.Browse for the extension you wrote in Python, select it, and then click Open.Under Extension Details, select the extension type of Python and then click the Select file … button.Under the Burp Extensions section, click the Add button.Now that you have written your first extension let’s load it in Burp and see what happens: ![]() This is useful to ensure the extension loads properly and gives us immediate feedback if something isn’t right.Īlright, let’s load this extension and see what happens! Loading your first custom extension We then print a string that will end up in the output screen of the Burp Extensions loader.While it’s not actually needed for this “Hello World” example, any real-world extension will ultimately rely on these when they need to do real work in other methods. Inside the registerExtenderCallbacks() method, we create internal references to the callbacks and their helpers.Don’t worry if that seems confusing… I’ll clear it up later we need to take advantage of it. It registers an instance of the IBurpExtenderCallbacks interface, providing methods that the extension may invoke to perform various actions. This method is invoked when the extension is loaded. Within that extension class, we need to implement a method called registerExtenderCallbacks(), which is exposed through the IBurpExtender interface.We then create our extension class and implement IBurpExtender.All Burp extensions MUST implement this interface. The first thing we do is import IBurpExtender from the burp module.Now put this code in there and save the file: from burp import IBurpExtenderĭef registerExtenderCallbacks(self, callbacks):ĬtExtensionName("Hello World") Open your favorite code editor and create a new python file with the. So let’s write our first “Hello World” extension, and then I’ll walk you through it. You can also find more detailed documentation online here. Right in BurpSuite, we can find all the exposed APIs documented under the APIs sub-tab in Extensions. So to get started, we need to understand the API PortSwigger makes available to us. Writing the most basic BurpSuite extension in Python Browse for your Jython standalone jar, and then click Open.Under Python Environment, click the Select file … button.I put mine in a burp folder in my home directory. Place it somewhere safe and easy to access. Setting up Jython to work with BurpSuite is relatively trivial. ![]() This is needed because BurpSuite is written in Java, so your extension will need to leverage Jython to interface with the APIs PortSwigger exposes to you within BurpSuite. Jython is an implementation of the Python programming language designed to run on the Java platform. All you really need is a code editor (hell, even vi will do) and Jython. Personally, I am a big fan of writing them in Python as it is much simpler and easier to set up and get working than trying to set up a Java development environment. So you can write custom BurpSuite extensions in several languages, including Java, Python, and Ruby. We’ll cover everything from setting up your environment to working with the extension interfaces so that you have all the tools necessary to build an effective extension explicitly tailored to your needs. This article will provide a step-by-step guide to writing custom burp suite extensions to help with API pentesting. But did you know that you can extend the capabilities of BurpSuite even further by writing your own extensions? API pentesting is an integral part of any security assessment, and BurpSuite can be a powerful tool for testing APIs. ![]()
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