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Re: Tool to find hidden web proxy server
From: Rogan Dawes <discard () dawes za net>
Date: Thu, 02 Sep 2004 09:08:55 +0200

vinay mangal wrote:

Dear all,

Thanks for your suggestions. May be I am not able to define my question
properly.

This problem is strictly with in company internet access firewall and in the
LAN only. In a company, policy for Internet access says it is through IP
only. The others can not browse the internet. This policy is implemented on
firewall. Few smart guys have installed free proxy server running on non
default ports and distributed the internet access to their friends. The
firewall sees the traffic coming from the authorized IP and does not stop
them. We want to know who has installed proxy on there machine.

I hope, I am able to clearly define my question. Thanks


vinay

In that case, you should be looking for traffic destined for a proxy server in your network.

e.g.
ngrep "HTTP/1" dst net yournetwork

or something similar.

Of course, if your network is switched, you will not see the traffic you need unless your sniffer is attached to a mirrored port on your switch.

My recommendation is to have the security policy redistributed (if it already contains such prohibitions) or updated, and then point out to all your users that contravention of the security policy is a firing offence.

Your best bet to identify violators is to use (a variation of) the ngrep mentioned above, but make sure that you are seeing the necessary traffic via the switched port.

Hope this helps.

Rogan
--
Rogan Dawes

*ALL* messages to discard () dawes za net will be dropped, and added
to my blacklist. Please respond to "lists AT dawes DOT za DOT net"

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