SSH and GPG Key Management Utilities

Contains scripts for managing SSH and GPG keys, including backup, restoration, security hardening, and brute force protection.

Scripts

key-util.sh

• Backup and restore SSH and GPG keys
• Harden SSH configuration
• Usage: ./key-util.sh {backup|restore|harden-ssh}

fail2ban.sh

• Configure fail2ban to prevent SSH brute force attacks
• Set up SSHD jail with custom configuration
• Usage: ./fail2ban.sh

Security Features

SSH Hardening

• Disables password authentication
• Disables challenge-response authentication
• Enables public key authentication only
• Changes default SSH port (configurable)

Fail2ban Configuration

• Monitors SSH login attempts
• Bans IP addresses after 3 failed attempts
• 10-minute ban time
• Configurable via jail.local

Usage

1. Make scripts executable:

   chmod +x key-util.sh fail2ban.sh

2. Run key-util.sh:

   ./key-util.sh backup    # Backup SSH and GPG keys
   ./key-util.sh restore   # Restore SSH and GPG keys
   ./key-util.sh harden-ssh  # Harden SSH configuration

3. Run fail2ban.sh:

   ./fail2ban.sh          # Configure and start fail2ban

Requirements

• Linux system
• sudo privileges
• fail2ban (will be installed by fail2ban.sh)
• SSH and GPG installed