28 lines
1.1 KiB
Bash
28 lines
1.1 KiB
Bash
#!/usr/bin/env bash
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# @file ~/.local/bin/setup-firewall
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# @brief Setup and enable the firewall
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# @description
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# This script sets up and configures the firewall. On Linux systems, it prefers `firewall-cmd` and, if that is not available,
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# it uses `ufw`. By default, it allows outgoing traffic and denies incoming traffic.
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#
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# ## CloudFlare
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#
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# The script will allow incoming traffic on port 80 and 443 from any CloudFlare IP address. The logic was adapted from
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# [cloudflare-ufw](https://github.com/Paul-Reed/cloudflare-ufw).
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if command -v firewall-cmd > /dev/null; then
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echo "firewall-cmd detected - preferring this over UFW"
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elif command -v ufw > /dev/null; then
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### Deny incoming and allow outgoing
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sudo ufw default deny incoming
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sudo ufw default allow outgoing
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### Allow CloudFlare IPs to connect to port 80 and 443
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for CF_IP in `curl -sw '\n' https://www.cloudflare.com/ips-v{4,6}`; do
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sudo ufw allow proto tcp from "$CF_IP" to any port 80,443 comment 'CloudFlare IP'
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done
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### Enable / reload the firewall
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sudo ufw enable
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sudo ufw reload
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fi
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