Simple Bash Authentication Logic

This project is a practical exercise completed as part of my learning journey on TryHackMe. It demonstrates fundamental scripting concepts in Bash, focusing on user input handling and control flow.

🛠️ Description

The script simulates a basic authentication gateway. It prompts the user for three specific pieces of information (Username, Company Name, and PIN) using a loop and validates them against predefined credentials.

🧠 Key Concepts Applied

• Variable Initialization: Setting up placeholders for user data.
• For Loops: Iterating through a set range to trigger different input prompts.
• Conditional Logic (if/elif/else): Directing the script's behavior based on the current iteration and validating final credentials.
• Logical Operators: Using && (AND) to ensure all security conditions are met simultaneously.

🚀 How to Use

1. Clone the repository:

   #!/bin/bash
   
   # Initializing variables to store user input
   username=""
   companyname=""
   pin=""
   
   #    Starting a loop to gather information in 3 steps
   for i in {1..3}; do
   # Logic to prompt for different data based on the loop iteration
   if [ "$i" -eq 1 ]; then
       read -p "Enter your Username: " username
   elif [ "$i" -eq 2 ]; then
       read -p "Enter your Company name: " companyname
   else
       # Using -s flag is recommended for PINs, but keeping it simple for the exercise
       read -p "Enter your PIN: " pin
   fi
   done
   
   # Validating the credentials against hardcoded values
   if [ "$username" = "Neo" ] && [ "$companyname" = "Matrix" ] && [ "$pin" = "0123" ]; then
   echo "---------------------------------------"
   echo "Authentication Successful."
   echo "Access granted. Welcome back, Neo."
   echo "---------------------------------------"
   else
   echo "---------------------------------------"
   echo "Authentication Denied!!"
   echo "Invalid credentials. Access rejected."
   echo "---------------------------------------"
   exit 1
   fi

2. Grant execution permissions:

   chmod +x locker_script.sh

3. Run the script:

   ./locker_script.sh

📝 Disclaimer

This script was created for educational purposes. Note that hardcoding credentials (like the PIN in this script) is not a secure practice for real-world production environments and is used here strictly to demonstrate logic flow.

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Learning and building in public. 🚀