CTF Challenge: RustFixMe1

Challenge Overview:

• This was the following description for the challenge.
  

Aproach:

1. importing the file: After using the wget command, you should be able to see the fixme1.tar.gz.
2. Extracting the contents: The following command should allow you to extract all the files from the folder.

    tar -xzf fixme1.tar.gz
   

   • The tar command is used to compress files in linux.
   • -x: I like to think of it as “extract”.
   • -z: to be able unzip the file, since it ends with gz.
   • -f: reprsents a file, which in this case is fixme1.tar.gz, it could be any file.
3. Code Editor(Preference): As you can see below, that i have used sublime as my choice of a code editor, pick yours or join the train and use sublimetext as well.
   • Sublime-text installation:

      sudo apt install sublime-text
     

   • Then when you want to look at the contents of the file, which in this case is main.rs:

      subl main.rs
     

4. Code Analysis: I want to say, that i knew nothing about Rust-programming language. I had to do my research to be able to solve the challenge, one good resource is w3schools. Looking at the source code, we see that, they required us to just manipulate the source code such that it works right, meaning that we apply the correct syntax. Bsically the objective of this challenge was to, i guess introduce the Rust Porogramming language to us. It was fun, playing around with it to find to the correct syntax. But, honestly i struggled.
   • Notice the difference:
5. Execution of the code: After i have fixed the code, i struggled to execute the code, so i had to go to the rabbit hole again and do my research.
   • Installation of Rust:

      curl --proto \'=https\' --tlsv1.2 https://sh.rustup.rs -sSf | sh
     

   • Copy the way it is, and allow for installation to do its thing and lastly run the following command:

      sudo apt update rustc
     

   • If you are a programmer, i am sure you were also gonna first try to run the file like so:

      rustc main.rs
     

   • As you can see(initially i though the problem was in the source code), read where it says help: you might be...:

   • Yeah unfortunately this is wrong!, after thorough research i learnt that, you have to run the file, as a project(folder). But, in this case the necessary files(including the crate xor_cryptor) were already in the folder when we unzipped it. So you have to go back to the root of the folder(directory) “fixme1”.
   • It is clearly explained below:
6. The Flag:Thus, we should get our flag!.
   • In simple, this is how you compile:

      cargo build
     

   • Then it will a generate the run file. Execute it! Then we get our flag😆.