#!/bin/bash
#

## Firewall Script
#  01-07-26  by Erik Wegner
#  http-up <ExternalInterface>
#

EXT=$1  

if test -z $1 ; then
	echo "http-up <ExternalInterface>"
	echo "e.g.: http-up ippp0"
	exit 2
fi

# Pfad zu IPTables
if test -z $IPTABLES ; then
	IPTABLES=/usr/sbin/iptables
fi

## Ports
#  Nicht-privilegierte = 1024-65535
P_HIGH=1024:65535
P_HTTP=80

echo "HTTP $EXT [$P_HTTP] <-> [$P_HIGH]"

$IPTABLES -A OUTPUT -p TCP -o $EXT \
	--sport $P_HIGH \
	--dport $P_HTTP -j ACCEPT

$IPTABLES -A INPUT -p TCP -i $EXT \
	--sport $P_HTTP \
	--dport $P_HIGH ! --syn -j ACCEPT

$IPTABLES -A INPUT -p TCP --dport $P_HTTP --syn -j my_drop

