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#!/bin/bash
#Firewallscript written by David Leutgeb
#Alle Einstellungen löschen
echo "Flush all existing chains"
iptables -F
echo "Delete all custom chains"
iptables -X
#Eingehende Verbindungen akzeptieren
echo "Accept incoming connections"
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
#iptables -A INPUT -p tcp --dport 10051 -m state --state NEW -j ACCEPT
#iptables -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
#iptables -A INPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT
#iptables -A INPUT -p udp --dport 162 -m state --state NEW -j ACCEPT
#ICMP akzeptieren
echo "Accept ICMP"
iptables -A OUTPUT -p icmp -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
#Alle bereits hergestellten Verbindungen akzeptieren
echo "Accept established and related connections"
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
ip6tables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
#Ausgehende Verbindungen erlauben
echo "Accept outgoing connections"
iptables -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
ip6tables -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
#Lokale Verbindungen akzeptieren
echo "Accept local Connections"
iptables -A INPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
iptables -A OUTPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
#Alle Verbindungen standardmäßig verbieten
echo "Deny all connections"
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP
ip6tables -P FORWARD DROP
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