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