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iptables-boilerplate

rock solid default firewall-rules for webhosts

What is this?

iptables-boilerplate is a set of predefined firewall rules that are typically used on "webhosts". its not a set of rules, designed to secure your home or office-network or to setup a router or gatweay. think of "lamp"-servers.

iptables-boilerplate is tested on

  • Debian 5.0 / Lenny (oldstable)
  • Debian 6.0 / Squeeze (stable)
  • Debian 7.0 / Wheezy (testing)
  • Ubuntu 10.04 LTS / Lucid
  • Ubuntu 10.10 / Maverick
  • Ubuntu 11.04 / Natty
  • Ubuntu 11.10 / Oneiric
  • Ubuntu 12.04 - BETA1 / Precise

Features

  • rock solid defaults
  • easy extendable
  • one-line opening ports
  • one line whitelisting ips
  • one line blacklisting ips
  • extensively documented (inline comments)

Installation

create necessary directories first

sudo mkdir /etc/firewall
sudo mkdir /etc/firewall/custom

checkout the github repo and install the files

git clone git://github.com/bmaeser/iptables-boilerplate.git
cd iptables-boilerplate
sudo cp firewall /etc/init.d/firewall
cd etc/firewall/
sudo cp *.conf /etc/firewall/

make sure firewall ist executable and update runnlevels

sudo chmod 755 /etc/init.d/firewall
sudo update-rc.d firewall defaults

Configuration

All configuration-files are to be found at /etc/firewall/

Feel free to read the firewall-script itself and comment/uncomment what you like or dislike.

services.conf

This file is used to open ports for services like ssh or http(s) in your firewall.

SYNTAX:

PORT/PROTOCOLL SOURCE where SOURCE is the source ip or network

n.n.n.n/m - Where n.n.n.n is the IP address range and m is the bitmask.

if SOURCE is empty it defaults to 0.0.0.0/0 (which is any IP)

EXAMPLEs:

opens ports for SSH for IP 192.168.0.1:

22/tcp 192.168.0.1
22/udp 192.168.0.1

opens ports for HTTP for any IP

80/tcp 0.0.0.0/0

opens ports for HTTPS for any IP

443/tcp

ip-whitelist.conf:

Add all source IPs you want to have full access to this host. One IP per line

SYNTAX:

n.n.n.n/m.m.m.m - Where n.n.n.n is the IP address range and m.m.m.m is the netmask.

n.n.n.n/m - Where n.n.n.n is the IP address range and m is the bitmask.

EXAMPLEs:
192.168.0.1
192.168.1.0/8
192.168.55.0/255.255.255.148

ip-blacklist.conf:

Add all source IPs you want to COMPLETELY BLOCK One IP per line

SYNTAX:

n.n.n.n/m.m.m.m - Where n.n.n.n is the IP address range and m.m.m.m is the netmask.

n.n.n.n/m - Where n.n.n.n is the IP address range and m is the bitmask.

EXAMPLEs:
192.168.0.1
192.168.1.0/8
192.168.55.0/255.255.255.148

custom/*:

Every file/script you place here will be executed during firewall-start. Place your custom rules in here.

There are some usefull examples in ./custom-examples/ that limit the ammount of new and overall connections.

Usage

If you updated your runlevels, the firewall starts every time you boot your system. However, you can manually start/stop/restart, e.g. to update changed settings.

/etc/init.d/firewall (start|stop|restart|reload|force-reload|status)
  • start: starts the firewall
  • stop: stops the firewall
  • restart, reload, force-reload: restarts the firewall (all three the same)
  • status: print out the status of the firewall, shows all entries in iptables
  • version: print out the version of iptables-boilerplate

How to contribute

fork + hack + pull request please :-)

thx

Licence

The MIT License (MIT) Copyright © 2012 Bernhard Mäser, http://bmaeser.io

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.