#!/bin/sh

## on vide les tables
iptables -F
iptables -t nat -F
iptables -t filter -F
iptables -t mangle -F

echo firewall réinitialisé

iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP

## on autorise la transmission du ping
iptables -A FORWARD -i eth1 -o eth0 -p icmp --icmp-type echo-request -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -p icmp --icmp-type echo-reply -m state --state ESTABLISHED -j ACCEPT
iptables -t nat -A POSTROUTING -j MASQUERADE

## DNS
iptables -A FORWARD -i eth1 -o eth0 -p udp --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -p udp --sport 53 -m state --state ESTABLISHED -j ACCEPT

## HTTP
iptables -A FORWARD -i eth1 -o eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT

## HTTPS
##iptables -A FORWARD -i eth1 -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
##iptables -A FORWARD -i eth0 -o eth1 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

## Tinyproxy
iptables -A INPUT -i eth1 -p tcp --dport 8888 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p udp --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p udp --sport 53 -m state --state ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT## Tinyproxy

## Redirection sur proxy
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to 8888
## iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to 8888

## Connexions sortantes lan
iptables -A OUTPUT -o eth1 -m state --state ESTABLISHED -j ACCEPT

echo firewall chargé