Update Setup.sh

Setup.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -e
+
+SSH_KEY="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGrc2BRE6hkdSyyQMykQin/5HCaLyzRuOvSgei9LJ2yE nikoa@Niko-hp-gamingpc-1"
+SSH_DIR="/root/.ssh"
+AUTHORIZED_KEYS="$SSH_DIR/authorized_keys"
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "[!] This script must be run as root."
+    exit 1
+fi
+
+echo "[1/5] Updating system..."
+apt update && apt upgrade -y
+
+echo "[2/5] Installing sudo and curl..."
+apt install -y sudo curl
+
+echo "[3/5] Creating /root/.ssh if needed..."
+mkdir -p "$SSH_DIR"
+chmod 700 "$SSH_DIR"
+
+echo "[4/5] Adding SSH key to /root/.ssh/authorized_keys..."
+touch "$AUTHORIZED_KEYS"
+grep -qxF "$SSH_KEY" "$AUTHORIZED_KEYS" || echo "$SSH_KEY" >> "$AUTHORIZED_KEYS"
+chmod 600 "$AUTHORIZED_KEYS"
+
+echo "[5/5] Disabling SSH password authentication..."
+sed -i 's/^#\?\s*PasswordAuthentication\s\+.*/PasswordAuthentication no/' /etc/ssh/sshd_config
+sed -i 's/^#\?\s*ChallengeResponseAuthentication\s\+.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config
+
+echo "[✓] Restarting SSH service..."
+if command -v systemctl >/dev/null 2>&1; then
+    systemctl restart sshd
+else
+    service ssh restart
+fi
+
+echo "[✔] Setup complete. Root login via SSH key is enabled. Password login is disabled."