bash-linux-utils/iptables-http-cloudflare

#!/bin/bash

# Check for root user
CURR_USER=`/usr/bin/whoami`
if [ "$CURR_USER" != "root" ]; then
	echo "I need root rights... Please login from root"
	exit
fi

# Clear rules
/usr/local/bin/iptables-http-clear

# Download IP list to temp file
/usr/bin/wget "https://www.cloudflare.com/ips-v4" -O /tmp/ipslist.txt

# Deny all requests to port 80 from all
/sbin/iptables -I INPUT -p tcp -s 0.0.0.0/0 --dport 80 -j REJECT --reject-with tcp-reset

# Allow requests from www.cloudflare.com
while read ip; do
	if [ "$ip" != "" ]; then
		/sbin/iptables -I INPUT -p tcp -s $ip --dport 80 -j ACCEPT
	fi
done < /tmp/ipslist.txt

# Allow from our servers
# /sbin/iptables -I INPUT -p tcp -s 127.0.0.1 --dport 80 -j ACCEPT
# /sbin/iptables -I INPUT -p tcp -s 127.0.0.2 --dport 80 -j ACCEPT
# Where "127.0.0.1" is our server IP

# Remove temp file
/bin/rm /tmp/ipslist.txt