Last active
September 10, 2024 16:17
-
-
Save TruncatedDinoSour/e0c0c5076448a09c68ff50b00fbfab2b to your computer and use it in GitHub Desktop.
Use IPTables and IP6Tables as a firewall in Linux easily for SSH, HTTP(S), Email, Matrix, and XMPP traffic.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/bin/sh | |
| set -eu | |
| main() { | |
| for ip in iptables ip6tables; do | |
| echo '----------------------------------------------------------------' | |
| echo "[$ip] Setting up iptables rules..." | |
| echo "[$ip] Flushing all rules..." | |
| "$ip" -F | |
| "$ip" -X | |
| echo "[$ip] Allowing established connections..." | |
| "$ip" -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT | |
| echo "[$ip] Allowing loopback interface..." | |
| "$ip" -A INPUT -i lo -j ACCEPT | |
| "$ip" -A OUTPUT -o lo -j ACCEPT | |
| echo "[$ip] Allowing SSH, HTTP, HTTPS, Email federation, Matrix federation, and XMPP federation on tcp..." | |
| "$ip" -A INPUT -p tcp --dport 22 -j ACCEPT # SSH | |
| "$ip" -A INPUT -p tcp --dport 80 -j ACCEPT # HTTP | |
| "$ip" -A INPUT -p tcp --dport 443 -j ACCEPT # HTTPS | |
| "$ip" -A INPUT -p tcp -m multiport --dports 25,465,587,143,993,110,995,2525,4190 -j ACCEPT # Email federation | |
| "$ip" -A INPUT -p tcp --dport 8448 -j ACCEPT # Matrix federation | |
| "$ip" -A INPUT -p tcp -m multiport --dports 5222,5269,5223,5270,5281 -j ACCEPT # XMPP federation | |
| echo "[$ip] Rate limiting SSH traffic on tcp..." | |
| "$ip" -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -m recent --set | |
| "$ip" -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -m recent --update --seconds 60 --hitcount 5 -j DROP | |
| echo "[$ip] Dropping invalid packets on tcp..." | |
| "$ip" -A INPUT -p tcp -m state --state INVALID -j DROP | |
| echo "[$ip] Dropping other traffic..." | |
| "$ip" -P INPUT DROP | |
| "$ip" -P FORWARD DROP | |
| echo "[$ip] Rules:" | |
| "$ip" -vL | |
| echo '----------------------------------------------------------------' | |
| done | |
| echo '[ICMP] Allowing limited ICMP traffic...' | |
| iptables -A INPUT -p icmp -m limit --limit 5/sec --limit-burst 10 -j ACCEPT | |
| iptables -A INPUT -p icmp -j DROP | |
| ip6tables -A INPUT -p icmpv6 -m limit --limit 5/sec --limit-burst 10 -j ACCEPT | |
| ip6tables -A INPUT -p icmpv6 -j DROP | |
| echo '----------------------------------------------------------------' | |
| echo '[iptables-save] Saving rules...' | |
| iptables-save | tee /etc/iptables/rules.v4 | |
| echo '----------------------------------------------------------------' | |
| echo '[ip6tables-save] Saving rules...' | |
| ip6tables-save | tee /etc/iptables/rules.v6 | |
| echo 'Meoww :3 done' | |
| } | |
| main "$@" |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment