Editing OpenWRT Source Code for Handshake Replacement School Project
In this article, we will discuss how to edit the OpenWRT source code to implement a security algorithm that replaces the handshake in WPA. This project is suitable for a school project and will provide a hands-on experience in editing open-source firmware.
Introduction
OpenWRT is an open-source firmware that can be installed on many routers. It provides a lot of flexibility and customization options compared to the stock firmware that comes with most routers. One of the features of OpenWRT is the ability to replace the handshake in WPA with a custom security algorithm.
Prerequisites
Before we start editing the OpenWRT source code, we need to make sure we have the following prerequisites:
- A router that supports OpenWRT
- Basic knowledge of Linux command line
- Basic knowledge of C programming language
Getting the OpenWRT Source Code
The first step is to get the OpenWRT source code. We can clone the OpenWRT source code repository from GitHub using the following command:
git clone git://git.openwrt.org/openwrt.git
Understanding the OpenWRT Source Code
The OpenWRT source code is organized into several directories. The main directory is target, which contains subdirectories for different router architectures. We need to find the subdirectory for our router architecture and then navigate to the linux directory.
Inside the linux directory, we can find the source code for the Linux kernel. We need to find the source code for the wireless driver that our router uses. Once we find the wireless driver, we can start editing the source code to replace the handshake in WPA.
Replacing the Handshake in WPA
To replace the handshake in WPA, we need to modify the source code of the wireless driver. We need to find the function that handles the handshake and replace it with our custom security algorithm. We also need to make sure that our custom security algorithm is compatible with the WPA standard.
Once we have modified the source code, we need to compile it and install it on our router. We can use the OpenWRT build system to compile the source code. We need to create a custom build system configuration file that specifies the modifications we have made to the source code.
Testing the Custom Security Algorithm
After we have installed the modified firmware on our router, we need to test the custom security algorithm. We can use a wireless network analyzer tool to capture the handshake packets and analyze them. We need to make sure that the handshake packets are encrypted using our custom security algorithm.
Editing the OpenWRT source code to replace the handshake in WPA is a challenging but rewarding school project. It provides hands-on experience in editing open-source firmware and implementing custom security algorithms. With the right prerequisites and guidance, anyone can complete this project and enhance their knowledge of wireless security.