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Re: Client IP spoofing via squid proxy

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On 6/05/2015 2:25 a.m., Ambadas Hibare wrote:
> Hi,
> 
> I trying to spoof client IP via squid proxy by following  squid's
> TPROXY4 wiki page: http://wiki.squid-cache.org/Features/Tproxy4
> 
> But I want to know whether squid can spoof client IP when we send
> proxy format HTTP request from Mozilla (ie configuring proxy & port
> in mozilla). Can squid proxy behave transparently towards only the
> web server & not the client?

No. It can be both ways, or just towards the client.


> 
> I've tried sending proxy format HTTP request from client to squid box
> (on 3129  tproxy port), but I am getting Header forgery error Also
> its trying to connect to itself instead of web server. I am trying to
> understand why squid is trying to match host header's DNS with the
> destination IP instead of connecting to host header's DNS (like
> normal proxy behaviour on port 3128).
> 

To prevent CVE-2009-0801 happening.

You must not send regular forward-proxy traffic to a tproxy or intercept
port. Forwarding loops are guaranteed if you do.

Amos
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