#!/bin/bash
IPT=iptables
$IPT -F
$IPT -P INPUT DROP
$IPT -P FORWARD DROP
$IPT -P OUTPUT ACCEPT
# Allow loopback
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT
# Allow three-way handshake
$IPT -A INPUT -m state --state NEW -j ACCEPT
$IPT -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allow input ssh
$IPT -A INPUT -p tcp --dport 22 -j ACCEPT
# Allow smb over Port 445
\$IPT -A INPUT -p tcp --dport 445 -j ACCEPT