Proxy authentication

August 6, 2010 at 02:38:05
Specs: Windows 7
Hey guys, I have noticed that in my college and in my current work, when trying to log on to the wireless network with a windows machine, authentication is required in the form of logging in to a proxy via a web browser. However, when using a linux machine, authentication is not required. This is the same in both places.

I am also aware that the browser (in my case firefox) sends information about the browser, operating system etc as part of a session so this could provide the proxy with the means of distinguishing the OSs. I then downloaded an addon for firefox - user agent switcher which configures firefox to send other information. I tried configuring it to send fake information stating that I was using a linux operating system. This, however did not fool the proxy and I was still required to authenticate.

Does anyone know if there are other mechanisms that the proxy can use to determine the operating system or perhaps I am not using the application correctly?


See More: Proxy authentication

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August 6, 2010 at 06:21:20
The proxy doesn't require authentication for Linux because of the filtering rules that are in place which are based on OS fingerprinting. TCP SYN packets carry signatures. Filters can be set based on what the server sees when the SYN packet is sent.

Read passive OS fingerprinting. I have some examples of signatures, if you are interested.

How do you know when a politician is lying? His mouth is moving.

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August 6, 2010 at 06:38:49
Ooh thanks for the reply. Well i will have a look at your link first. I just needed a kick in the right direction.

Thanks a million

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August 6, 2010 at 06:40:59
Another thing, do you by any chance know of a program or easy method that I can use to change my os fingerprint to make the proxy think that my pc was running linux?

I think this could be a very beneficial exercise!

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