Prep: Build a Proxy in Python

Motivation

In general an online game has two types of exploits:

• "Client-side" exploit: we reverse the game client and tamper computer memory, such as DLL injection and aimbot.

• "Server-side" exploit: we build a proxy, host it on a proxy server (I use Ubuntu VM) and tamper the network packets between game client and game server.

In this section we are going build a proxy in Python and set it up on the Ubuntu VM. For now this proxy only captures and forwards packets, but in the future we will tamper with the packets.

The prototype of this proxy is made by LiveOverflow:

https://github.com/LiveOverflow/PwnAdventure3/tree/master/tools/proxy

Of course we can't just copy and paste it, we won't learn anything from doing that. Instead, we will be analyzing it in detail and make improvements if needed. In this section we are going to analyze proxy_part9.py and parser_part9.py.

Step 1: Software design

Step 2: class Proxy2Server

Step 3: class Game2Proxy

Step 4: class Proxy

Step 5: Complete the script

Step 6: Set up the proxy in Ubuntu VM