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Hide Origin IP

Supaya tidak perlu update manual setiap kali Cloudflare menambah/mengubah daftar IP mereka. Kita bisa buat script otomatis yang akan:

  1. Download daftar IP Cloudflare terbaru dari URL resminya

  2. Simpan ke file (misalnya /etc/nginx/conf.d/cloudflare.conf atau .htaccess untuk Apache).

  3. Reload webserver agar aturan langsung aktif.

Berikut contoh script bash untuk Nginx:

#!/bin/bash
# update-cloudflare-ips.sh

CF_DIR="/etc/nginx/cloudflare"
ALLOW_FILE="$CF_DIR/allow.conf"
REALIP_FILE="$CF_DIR/set_real_ip.conf"

mkdir -p $CF_DIR

# Download IP list
curl -s https://www.cloudflare.com/ips-v4 -o $CF_DIR/ips-v4
curl -s https://www.cloudflare.com/ips-v6 -o $CF_DIR/ips-v6

# Generate allow.conf
{
  echo "# Cloudflare allow list - $(date)"
  while read ip; do
    echo "allow $ip;"
  done < $CF_DIR/ips-v4
  while read ip; do
    echo "allow $ip;"
  done < $CF_DIR/ips-v6
  echo "deny all;"
} > $ALLOW_FILE

# Generate set_real_ip.conf
{
  echo "# Cloudflare real IP - $(date)"
  while read ip; do
    echo "set_real_ip_from $ip;"
  done < $CF_DIR/ips-v4
  while read ip; do
    echo "set_real_ip_from $ip;"
  done < $CF_DIR/ips-v6
} > $REALIP_FILE

# Reload nginx
nginx -t && systemctl reload nginx

🔹 Cara pakai:

  1. Simpan file script di /usr/local/bin/update-cloudflare-ips.sh

  2. chmod +x /usr/local/bin/update-cloudflare-ips.sh

  3. Tambahkan ke cronjob biar auto update tiap hari:

0 3 * * * /usr/local/bin/update-cloudflare-ips.sh

Mantap mas, sudah rapi đź‘Ť.

Tapi problemnya sekarang: daftar allow Cloudflare di vhost masih hardcoded â†’ artinya kalau Cloudflare ganti/tambah IP, harus update manual.

Supaya otomatis, triknya: pisahkan daftar allow ke file terpisah, lalu biarkan script update-cloudflare-ips.sh yang saya kasih kemarin mengisinya.

🔧 Langkah modifikasi vhost

Ubah bagian allow yang panjang itu jadi include file eksternal. Misalnya:

server {
    listen 443 ssl;
    server_name poltekesos.ac.id www.poltekesos.ac.id;

    ssl_certificate /etc/nginx/ssl/2025/poltekesos.crt;
    ssl_certificate_key /etc/nginx/ssl/2025/poltekesos.key;
    proxy_buffers 16 64k;
    proxy_buffer_size 128k;
    add_header Strict-Transport-Security "max-age=31536000";

    access_log  /var/log/nginx/poltekesos_ssl.access.log;
    error_log   /var/log/nginx/poltekesos_ssl.error.log;

    # --- Cloudflare trust real IP ---
    include /etc/nginx/cloudflare/set_real_ip.conf;
    real_ip_header X-Forwarded-For;

    location / {
        # Izinkan admin
        allow 103.184.56.245;

        # Izinkan semua Cloudflare ranges (otomatis via script)
        include /etc/nginx/cloudflare/allow.conf;

        # Semua selain admin + Cloudflare → maintenance
        deny all;
        error_page 403 = /maintenance.html;

        # Backend hanya untuk IP valid
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        modsecurity_rules_file /etc/nginx/modsec/conf/poltekesos.ac.id/modsecurity.conf;
        client_max_body_size 1024M;
        client_body_buffer_size 1024M;

        proxy_connect_timeout       600;
        proxy_send_timeout          600;
        proxy_read_timeout          600;
        send_timeout                600;
        proxy_redirect off;
        proxy_set_header    Host            $host;
        proxy_set_header    X-Real-IP       $remote_addr;
        proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Proto https;
        proxy_pass  http://172.16.10.16:80;
    }

    location = /maintenance.html {
        root /var/www/html;
    }
}

👉 Dengan konfigurasi vhost di atas:

  • IP 103.184.56.245 bisa akses normal.

  • Semua IP lain otomatis akan kena 403 Forbidden.

Setelah edit, jangan lupa:

nginx -t
systemctl reload nginx

berikut contoh maintenance page (selain IP 103.184.56.245 yang tetap bisa akses)? Jadi publik lihat halaman "Maintenance" tapi admin tetap bisa buka situs asli.

jadi konsepnya seperti ini:

  • IP admin (103.184.56.245) tetap bisa mengakses website asli.

  • IP lain diarahkan ke halaman statis “Maintenance Mode”.

Caranya:

  1. Buat dulu file maintenance (misalnya di /var/www/html/maintenance.html):

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Maintenance</title>
  <style>
    body { 
      font-family: Arial, sans-serif; 
      text-align: center; 
      margin-top: 15%;
      background: #f4f4f4;
    }
    .box {
      background: #fff;
      padding: 40px;
      border-radius: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
      display: inline-block;
    }
  </style>
</head>
<body>
  <div class="box">
    <h1>🚧 Maintenance Mode</h1>
    <p>Situs sedang dalam perbaikan sementara.<br>
    Silakan coba lagi nanti.</p>
  </div>
</body>
</html>
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