ctf-nc-framework
A tiny framework to run python challenges in raw TCP.
Installing
Just clone this repo and you're already down for business!
Wanna test it out? Just run ./ctfnc prod.
How to
Code your own challenge in src/main.py.
There, you'll need to define a main function that has two
parameters: stdin and stdout.
- You should use the
stdin.readline().strip()to get your input. - You should use
stdout.write()to output something. Remember to send\ns to the function! - In case you want to output without sending a
\n, usestdout.flush(). - Do NOT use
inputorprintfor reasons other than debugging.
After that, you can test it using ./ctfnc dev. You should be able to use it through your terminal.
With that working, try using ./ctfnc prod. it will start listening on a TCP socket (by default, 9001),
and be able to serve your challenge up to 10 users at the same time (also configurable -- see below).
Configuration
All configuration lies in config/config.py, although every single one of them is overwritable by env vars
with the same name. for example, the config CTFNC_PORT is overwritable by the env var CTFNC_PORT.