From mboxrd@z Thu Jan  1 00:00:00 1970
From: Binish A R <binishar@poornam.com>
Subject: iptables LOG options
Date: Tue, 24 May 2005 09:08:15 +0530
Message-ID: <4292A1A7.3020401@poornam.com>
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Hello,

I am trying to write my custom firewall rules.
I want to drop all outgoing ssh for non root users and log any such attempts at the same time.
I want to log the username trying to do that. What option should I give?

The following won't definitely work.

iptables -I OUTPUT -p tcp --dport 22  -m owner ! --uid-owner root -j LOG --log-prefix "$USER NO SSH ALLOWED"

because the shell expands $USER variable immediately.

Is there any other option to find the value of owner that get matched by the below rule:


iptables -I OUTPUT -p tcp --dport 22  -m owner ! --uid-owner root


Any help is much appreciated.


Thanks and Regards,

Binish