EnablePassword Auth-SSH

#!/bin/bash

# Script to reinstall and configure SSH for password authentication and root login

# Check if the script is run as root
if [ "$(id -u)" -ne 0 ]; then
  echo "This script must be run as root. Please use sudo or log in as root."
  exit 1
fi

echo "Starting the SSH server reinstallation process..."

# Remove existing OpenSSH server and its configuration files
echo "Removing existing OpenSSH server..."
sudo apt purge -y openssh-server
sudo rm -rf /etc/ssh/
echo "OpenSSH server removed."

# Reinstall OpenSSH server
echo "Reinstalling OpenSSH server..."
sudo apt install -y openssh-server
echo "OpenSSH server reinstalled."

# Path to the SSH configuration file
SSH_CONFIG="/etc/ssh/sshd_config"

# Make a backup of the new SSH configuration file
echo "Backing up the new SSH configuration file..."
sudo cp $SSH_CONFIG $SSH_CONFIG.backup
echo "Backup created."

# Display the sections of the file before modification
echo "Initial state of PasswordAuthentication and PermitRootLogin:"
sudo grep -E 'PasswordAuthentication|PermitRootLogin' $SSH_CONFIG

# Update Include directive, handle variations in spacing
echo "Updating SSH configuration to include specific files..."
sudo sed -i '/^# *Include \/etc\/ssh\/sshd_config.d\/\*.conf/s/^# *//' $SSH_CONFIG

# Enable PasswordAuthentication, handle variations in spacing and existing no/yes
echo "Enabling PasswordAuthentication..."
sudo sed -i '/^# *PasswordAuthentication no/s/^# *//' $SSH_CONFIG
sudo sed -i 's/^PasswordAuthentication no/PasswordAuthentication yes/' $SSH_CONFIG
sudo sed -i '/^# *PasswordAuthentication yes/s/^# *//' $SSH_CONFIG

# Permit root login, handle variations in spacing
echo "Enabling root login..."
sudo sed -i '/^# *PermitRootLogin prohibit-password/s/^# *//' $SSH_CONFIG
sudo sed -i 's/^PermitRootLogin prohibit-password/PermitRootLogin yes/' $SSH_CONFIG
sudo sed -i '/^# *PermitRootLogin yes/s/^# *//' $SSH_CONFIG

# Display the modified sections of the file
echo "Modified state of PasswordAuthentication and PermitRootLogin:"
sudo grep -E 'PasswordAuthentication|PermitRootLogin' $SSH_CONFIG

# Restart SSH service to apply changes
echo "Restarting SSH service to apply changes..."
sudo systemctl restart sshd
echo "SSH service restarted successfully."

echo "SSH configuration updated and service restarted successfully."