Passwordless SSH

Title

Before proceeding make sure Key-Based Authentication (see: SSH Keys) is configured!

#!/bin/bash
 
# Check if the script is run as root
if [ "$(id -u)" -ne 0 ]; then
  echo "This script must be run as root. Use 'sudo' to run it." >&2
  exit 1
fi
 
# Display the important message
echo "IMPORTANT: First Setup SSH Key-Based Authentication AND TEST IT!"
 
# Ask for user confirmation to proceed
read -p "Have you set up and tested SSH key-based authentication? (y/N) " response
 
# Check the user's response
case "$response" in
    [yY][eE][sS]|[yY]) 
        # The user agreed, proceed with the script
        echo "Proceeding with SSH configuration..."
        ;;
    *)
        # Any other response means abort
        echo "Operation aborted. Please set up and test SSH key-based authentication before running this script again."
        exit 1
        ;;
esac
 
# Define the target file path
TARGET_FILE="/etc/ssh/sshd_config.d/10-passwordless_login.conf"
 
# Append the lines to the file
echo -e "ChallengeResponseAuthentication no\nPasswordAuthentication no" | tee -a "$TARGET_FILE" > /dev/null
 
# Restart the SSH service to apply changes. This command might vary based on your system.
systemctl restart sshd

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Relevant Note(s):