UFW rule updater to only allow HTTP and HTTPS traffic from Cloudflare IP address ranges

readme.md

UFW + Cloudflare Auto-Updater

Check your current rules first (sudo ufw status numbered); if you're already allowing traffic to ports 80 and 443 from anywhere, delete those rules with sudo ufw rule delete X (replace X with appropriate rule number).

Make sure you're allowing SSH traffic for yourself before enabling! sudo ufw allow ssh to be "safe" — restrict SSH to your own IPs later if you'd like to actually be safe. ;)

Run this script once and then sudo ufw enable to lock everything down.

To run as a daily cron job:

1. sudo crontab -e
2. Add this line to the end: @daily /file/location/cloudflare-ufw.sh &> /dev/null

cloudflare-ufw.sh

#!/bin/sh
#
#  UFW rule updater to only allow HTTP and HTTPS traffic from Cloudflare IP addresses.
#  Inspired by https://github.com/Paul-Reed/cloudflare-ufw/blob/master/cloudflare-ufw.sh
#
#  To run as a daily cron job:
#    1. sudo crontab -e
#    2. Add this line to the end:
#        @daily /this/file/location/cloudflare-ufw.sh &> /dev/null

# Fetch latest IP range lists (both v4 and v6) directly from Cloudflare
curl -s https://www.cloudflare.com/ips-v4 -o /tmp/cf_ips
echo "\n" >> /tmp/cf_ips
curl -s https://www.cloudflare.com/ips-v6 >> /tmp/cf_ips

# Restrict traffic to ports 80 (TCP) & 443 (TCP)
# UFW will skip an IP range if a rule already exists for it (which it probably does)
for ip in `cat /tmp/cf_ips`; do ufw allow proto tcp from $ip to any port 80,443 comment 'Cloudflare'; done

# Clear downloaded lists from above
rm /tmp/cf_ips

# Need to reload UFW for any new rules to take effect
ufw reload