From: Joel Esler (joel.eslersourcefire.com)
Date: Thu Jan 17 2008 - 09:36:29 CST

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You have two options. Correlate the events with the logs from your
Squid proxy, or move the Snort sensor inside the proxy.

Sometimes (and right now I can't remember if Squid does it) it will
add a header to the http that says "X-Forwarded-For" or similar that
will have the IP of the actual client. However, like I said, I can't
remember if Squid does that for you, and that would be the only way
that you can see the IP behind the proxy.

Joel

On Jan 17, 2008, at 5:46 AM, Helmut Schneider wrote:

> Hi,
>
> I'm using snort 2.7 on two machines, one at a hub next to the router
> and the
> firewall and since yesterday a second sensor on my proxy (squid). All
> web-traffic must go through the proxy.
> The first sensor gives information about e.g. that one uses google
> desktop
> but does not say which client (of course, as source is the proxy).
> So I
> installed snort as a second sensor on the proxy but without success.
> The
> alerts the first sensors finds are not found on the second sensor
> (the squid
> protocol might differ from HTTP).
>
> Is there a way to configure snort to reveal which exact client
> "breaks"
> policies?
>
> Thanks, Helmut
>
>
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