🔐 Linux Secure Scripts

A set of Bash scripts to automate the hardening of Ubuntu Linux systems, making them safer and more secure with minimal effort. Perfect for beginners learning system administration or cybersecurity.

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📌 Features

• 🔒 Disable root login via SSH and 🔓 Enable root login
• 🔥 Install and configure UFW firewall
• 📦 Enable automatic system updates
• 👤 Create secure, limited-privilege user accounts

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linux-secure-scripts/

• disable-root-ssh.sh # Disable root SSH access
• enable-root-ssh.sh # Enable root SSH access
• enable_ufw.sh # Enable and configure firewall
• auto-update.sh # Auto-update installed packages
• create-user.sh # Create a new user with sudo access
• README.md # This file

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🛠️ Requirements

• Ubuntu based Linux machine
• sudo privileges
• Internet access
• Basic familiarity with the terminal

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🚀 Getting Started

1. Clone this repository:

git clone https://github.com/Anwesa-s/linux-secure-scripts.git
cd linux-secure-scripts

2. Make all scripts executable:

chmod +x *.sh

3. Run each scripts:

sudo ./disable-root-ssh.sh
sudo ./enable-root-ssh.sh
sudo ./enable_ufw.sh
sudo ./auto-update-upgrade.sh
sudo ./user_make.sh

💡 Pro tip: Always test scripts on a virtual machine before deploying to a real server.

🧪 Script Details

1. disable-root-ssh.sh Disables SSH login for the root user by modifying /etc/ssh/sshd_config, then restarts the SSH service.

1.1 enable-root-ssh.sh Enables SSH login for the root via the backup file, then restart the SSH service.

2. enable_ufw.sh Installs UFW (Uncomplicated Firewall), sets secure default rules, and allows only SSH traffic.

3. auto-update-upgrade.sh Updates and upgrades system packages using APT. Automate this with cron for regular updates.

4. user_make.sh Prompts for a username, creates a user, sets a password, and adds the user to the sudo group.

🎓 Learning Outcomes

By completing this project, you'll learn:

✅ Bash scripting fundamentals

✅ Linux server hardening techniques

✅ Basic firewall configuration with UFW

✅ Secure user management