To use the included Bash script to implement a two-factor authentication layer (2FA) on a Linux server, follow these steps:

1. Download and save the script: Save the script with:

   git clone https://github.com/carligithub400/literate-auth/

2. Set up a Telegram bot:

   • Create a new Telegram bot by talking to the BotFather on Telegram. Make a note of the token provided.

3. Get your chat ID:

   • Start a chat with your newly created bot on Telegram.
   • Visit the following URL and replace <YOUR_BOT_TOKEN> with your actual bot token: https://api.telegram.org/bot<YOUR_BOT_TOKEN>/getUpdates
   • Look for the 'chat' part in the answer. The id field in the chat object is your chat ID. Make a note of it.

4. Edit the script:

   • Open the script in a text editor and replace "token" with your Telegram bot token and "id" with your chat ID.

5. Run the script:

   • Run the script in your terminal:

     bash literate-auth/main.sh

6. Follow the directions:

   • The script will generate a random 6-digit challenge and send it to your Telegram bot.
   • You will be asked to enter the challenge answer without the entry being displayed.
   • Type the correct answer to continue.

7. Access to the scale:

   • If the answer is correct, the script grants access to the /bin/bash shell.
   • If the answer is incorrect, the connection will be disconnected.

8. Cleanup:

   • After successful authentication, the script deletes the challenge file.

9. Create a user and connect to ssh

   • Create a user with the command that has the code main.sh as the default shell.

     sudo adduser $user --shell=$path_main.sh

   • Change $user with the name of the user and $path_main.sh with the path of the cloned code.

   • Make sure it has execution rights:

   chmod a+xrw literate-auth/

   • Ssh to the user and if all goes well it will say that you have to enter a code.

Important Considerations:

• Test environment: This script is for testing purposes only. Do not use it in production or for critical tasks.
• Security: Be careful where and how you deploy this script. Telegram is used for communication, so make sure your bot and chat ID are safe.
• Permissions: Ensure that the script has the necessary permissions to read and write to the file system.

By following these steps, you can experiment with implementing a simple 2FA layer using Telegram for code transfer in a controlled test environment.