Disable SSH Password Programtically

secure_ssh.sh

#!/bin/bash

# Prompt the user for remote host information
read -p "Enter remote username: " remote_username
read -sp "Enter remote password: " remote_password
echo
read -p "Enter remote hostname or IP address: " remote_host

# Generate a random filename for the key pair
random_id=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 10 | head -n 1)
key_filename="id_rsa_$random_id"

# Generate a new SSH key pair with the random filename
ssh-keygen -t rsa -b 4096 -N "" -f ~/.ssh/"$key_filename"

# Get the public key
public_key=$(cat ~/.ssh/"$key_filename".pub)

# Copy the public key to the remote host using sshpass
sshpass -p "$remote_password" ssh -o StrictHostKeyChecking=no "$remote_username@$remote_host" "mkdir -p ~/.ssh && echo '$public_key' >> ~/.ssh/authorized_keys"

# Test the SSH connection
if ssh "$remote_username@$remote_host" "echo 'SSH connection successful!'"; then
  echo "SSH key setup complete!"

  # Disable password login on the remote host
  sshpass -p "$remote_password" ssh -o StrictHostKeyChecking=no "$remote_username@$remote_host" "sudo sed -i 's/^PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config"
  sshpass -p "$remote_password" ssh -o StrictHostKeyChecking=no "$remote_username@$remote_host" "sudo systemctl restart ssh"

  echo "Password login disabled on the remote host."
else
  echo "SSH connection failed. Key setup incomplete."
fi