https://github.com/disconnect3d/crackme

Small crackme game on Linux
https://github.com/disconnect3d/crackme

crackme game hack reverse-engineering

Last synced: about 1 month ago
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Small crackme game on Linux

• Host: GitHub
• URL: https://github.com/disconnect3d/crackme
• Owner: disconnect3d
• Created: 2015-11-16T22:25:59.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2018-12-12T21:28:45.000Z (about 6 years ago)
• Last Synced: 2024-11-05T09:51:47.157Z (3 months ago)
• Topics: crackme, game, hack, reverse-engineering
• Language: C++
• Homepage:
• Size: 12.7 KB
• Stars: 27
• Watchers: 4
• Forks: 7
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Cr4ckm3 game

Cr4ckm3 is a small cracking game in which you search for password by using "unusual" [debugging] tools.

The exercises are pretty easy, you need to use tools like `strings`, `strace`, `gdb`, `gprof` or `g++`/`clang++` sanitizers.

# Docker build instructions

To make sure you have all the right versions of all the required tools, there is a Docker build file. To build the Docker image:

```bash

bash ./docker/build.sh

```

... and play the game, run the following:

```bash

bash ./docker/run.sh

# now you're in the container

cat README.md # to see instructions

cd crackme/

ls # you'll see all the challenges here

```

# Rules

* do not look into makefile or src sources

* do not change chmods

# How to play

Just clone the repository and fire `make` - it will build up a `crackme` directory. The first level is called `warmup`, so just fire `./crackme/warmup`. Hack it with `strace` or `strings`.

The password you will find is the next level file name (so if you find `password is something`, then the next file to hack is `./crackme/something`).

# Authors

The game was made by Dominik Czarnota & Dariusz Zielinski for university classes at AGH University of Science and Technology in Cracow.

# Hints/tools needed for particular level

Level 0 - warmup - `strace` / `strings`

Level 1 - `strace` / `grep`

Level 2 - `strace`, knowledge of file descriptors (and which file descriptors are usually opened for an executable?)

Level 3 - `strace` (did you know that you can read about syscall using `man`? e.g. `man 2 read`)

Level 4 - one of `g++` / `clang++` sanitizer (refer to `man g++` or read up documentation) should tell you what's wrong; you have to fix the program in here (so yeah, `cp` the source, change something and recompile)

Level 5 - `strace`

Level 6 - the binary is compiled with `-pg` flag; use `gprof`

Level 7 - `gdb`