| #!/bin/bash |
| # Copyright 2015 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| iptables -P INPUT DROP -w |
| iptables -P FORWARD DROP -w |
| iptables -P OUTPUT DROP -w |
| |
| # Accept everything on the loopback |
| iptables -I INPUT -i lo -j ACCEPT -w |
| iptables -I OUTPUT -o lo -j ACCEPT -w |
| |
| # Accept return traffic inbound |
| iptables -I INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -w |
| |
| # Accept icmp echo (NB: icmp echo ratelimiting is done by the kernel) |
| iptables -A INPUT -p icmp -j ACCEPT -w |
| |
| # Accept new and return traffic outbound |
| iptables -I OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT -w |
