Rick Chall

Players found themselves in some weird 3D world. There are tons of levers which activate mysterious boxes following even more mysterious rules. You get the flag after winning N levels.

The chall has two components: the game (binary, C++) and the backend (a python script).

See below for how to setup a locally.

Disclaimer

I wrote part of the opengl c++ codebase 10+ years ago for a class during my MS... and the rest has been written under a lot of pressure... I'm not exactly proud of the quality of this codebase ;-) But, still, it did its job, and this is anyways a good starting point to mess with the chall and/or to get an idea about opengl code, regardless of the CTF chall. Enjoy & don't judge (too much)!

Notes for local setup

• setup the backend:

  • Run cd service && ./run-backend-docker.sh
  • The script will build + run the docker container with backend.py, and it will print the container IP. The backend should be now reachable with nc <IP> 4343. You should get back RICK + some random bytes.

• build the game / binary:

  • Run cd service && ./make-docker.sh. This script will build + run the container for creating the binary. If everything goes well, you will find the binary at ./service/rick. This rick binary is self-contained and already embeds the various resources.

• patch the game so that it reaches the proper backend:

  • the game reaches out to rick.challenges.ooo. The backend will stay up for a while, but if you want to play with this locally, you may want to patch your /etc/hosts so that this domain name points to the IP of the backend's container.

• install the dependencies to run the game:

  • sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev should be enough
  • tested on Ubuntu 20.04.