Change-SSH-Port

⚠️ Warning: This script has been hardly tested. Please proceed with caution.

Changes SSH port on Ubuntu, Debian, or CentOS machine with bash "semi-automatically". Please feel free to use it at your discretion.

User must be root:

sudo -i

Then copy and run:

bash <(curl -Ls https://raw.githubusercontent.com/Eggwite/Change-SSH-Port/main/change_ssh_port.sh)

Optionally, keep old firewall rules:

bash <(curl -Ls https://raw.githubusercontent.com/Eggwite/Change-SSH-Port/main/change_ssh_port.sh) --old-rules

Here’s a summary of what the script does:

Checks Linux Version Compatibility:

• Ensures the script is compatible with Ubuntu, Debian, or CentOS.
• Allows users to continue with an unsupported version if they choose.

Gets Current SSH Port:

• Retrieves the current SSH port from the sshd_config file.
• Prompts the user for the current port if it can’t be found.

Prompts for New SSH Port:

• Asks the user to enter a new SSH port.
• Check if the new port is available.

Creates a Backup of SSH Configuration:

• Backs up the current SSH configuration file to /etc/ssh/sshd_config.bak.

Updates Firewall Rules:

• Checks if UFW (Uncomplicated Firewall) is installed and updates rules for the new port, removing old port rules.
• Checks if iptables is installed and updates rules for the new port, removing old port rules.
• Optionally keeps old firewall rules if the --old-rules flag is provided.

Updates SSH Configuration:

• Modifies the sshd_config file to use the new SSH port.

Restarts SSH Service:

• Restart the SSH service to apply the new configuration.
• If the restart fails, restore the original configuration and restart the service.

💖 If you've read this far, why not give it a star? Maybe create a PR to improve my shoddy code.