Getting started with Burp Suite extension_Getting started with Burp Suite extension.png

EducativeDockerBurpV2.tar.gz

BurpSuiteCommunityBuildTheJarV4

This course is for folks who are new to security, are experts already, or are just curious. We will learn how to build Burp Suite extension plugins with a focus on development using IntelliJ & Java.

You will be able to build Burp Suite Extension Plugins from scratch with live development and testing in Java by the end of the course. These projects will be useful learning experiences for both web application security specialists and developers. This course assumes a rudimentary understanding of Burp Suite as well as basic object-oriented programming experience.

Burp Suite Extension Development

# Helper Interface
In the last lesson on the Hello World extension, we used the callback object’s methods twice to set the name of the extension and display a message on the "Alert" tab. The `Callback` interface is very helpful because it offers plenty of other resources as instance objects.

One of the most important methods shared by callbacks is `getHelpers()`. This method returns an object of `IExtensionHelperstype` which, as the name suggests, helps make boring tasks easier. The object contains multiple methods such as:

* `analyzeRequest()`: This method can be used to analyze an HTTP request and obtain various key details about it.
* `analyzeResponse()`: This method can be used to analyze an HTTP response and obtain various key details about it.
* `base64Encode()`: This method can be used to Base64-encode the specified data.
* `base64Decode()`: This method can be used to decode Base64-encoded data.
* `urlDecode()`: This method can be used to URL-decode specified data.
* `urlEncode()`: This method can be used to URL-encode specified data. 

The full list of extension helpers can be found on Portswigger's official [website](https://portswigger.net/burp/extender/api/burp/package-summary.html).

# Simple URL encoder
Let’s create a very simple static URL encoder with the process we have learned. We will use the same process to create a base class that will receive an `IBurpExtenderInterface` as a callback object. This will be used to get a helper instance and, eventually, create an encoded string for the static URL and be used to display encoded text in the "Alerts" tab. The code is pretty straightforward.

In this lesson, we will cover the Extender API interfaces and their use cases.

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Deep Dive: Burp Extender API Interfaces

Helper Interface