Allow only cloudflare IP addresses to prevent firewall bypass (Laravel Forge)

nginx.conf

# FORGE CONFIG (DO NOT REMOVE!)
include forge-conf/www.example.com/before/*;

geo $realip_remote_addr $cloudflare_ip {
    default          0;
    103.21.244.0/22  1;
    103.22.200.0/22  1;
    103.31.4.0/22    1;
    104.16.0.0/13    1;
    104.24.0.0/14    1;
    108.162.192.0/18 1;
    131.0.72.0/22    1;
    141.101.64.0/18  1;
    162.158.0.0/15   1;
    172.64.0.0/13    1;
    173.245.48.0/20  1;
    188.114.96.0/20  1;
    190.93.240.0/20  1;
    197.234.240.0/22 1;
    198.41.128.0/17  1;
    2400:cb00::/32   1;
    2606:4700::/32   1;
    2803:f800::/32   1;
    2405:b500::/32   1;
    2405:8100::/32   1;
    2a06:98c0::/29   1;
    2c0f:f248::/32   1;
}

server {
    listen 80;
    listen [::]:80;
    server_name www.example.com;
    server_tokens off;
    root /home/forge/www.example.com/web;

    # FORGE SSL (DO NOT REMOVE!)
    # ssl_certificate;
    # ssl_certificate_key;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_dhparam /etc/nginx/dhparams.pem;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    index index.html index.htm index.php;

    charset utf-8;

    # FORGE CONFIG (DO NOT REMOVE!)
    include forge-conf/www.example.com/server/*;
    
    if ($cloudflare_ip != 1) {
        return 403;
    }

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    access_log off;
    error_log  /var/log/nginx/www.example.com-error.log error;

    error_page 404 /index.php;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
}

# FORGE CONFIG (DO NOT REMOVE!)
include forge-conf/www.example.com/after/*;

Periodically needs to be updated from https://www.cloudflare.com/en-gb/ips/