www.nico.schottelius.org/blog/iptables-distribution-independent-powered-by-cdist-sponsored-by-panter.mdwn

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[[!meta title="Linux distribution independent iptables setup powered by cdist sponsored by panter"]]
## Introduction
As a sysadmin, you may have encountered several different
Linux distributions in your life. You may also have found
out that configuring [[!iptables]]
permanently differs from distribution to distribution.
Fortunately you can stop caring about this problem:
In the [[cdist|software/cdist]] source tree you find
two new types to handle this problem universally, independent
of the Linux distribution.
These types are a result of work done at [[!ungleich]]
for our customer [[!panter]]. Panter does not only
allow us to publish the code freely, but also encourages
us to do so - many thanks!
## How to use it
First of all, ensure you have cdist installed on your source host.
Then create the directory ~/.cdist/manifest and then the file
~/.cdist/manifest/init with the following content:
case "$__target_host" in
insert-your-target-host-name-here)
__iptables_rule policy-in --rule "-P INPUT DROP"
__iptables_rule policy-out --rule "-P OUTPUT ACCEPT"
__iptables_rule policy-fwd --rule "-P FORWARD DROP"
__iptables_rule established --rule "-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT"
__iptables_rule http --rule "-A INPUT -p tcp --dport 80 -j ACCEPT"
__iptables_rule ssh --rule "-A INPUT -p tcp --dport 22 -j ACCEPT"
;;
esac
Running
% cdist config insert-your-target-host-name-here
applies the configuration. That's it, really! Log on to your
server and do ***iptables -L -n*** to see the result!
## What did cdist do?
The cdist types \_\_iptables\_rule and \_\_iptables\_apply
take care of the necessary steps. In detail they
* create the necessary files and directory
* create and setup an init-script that loads / unloads the rules
* apply the rules
[[!tag net unix foss ungleich panter]]