ASP authentication
From: Bénoni MARTIN (Benoni.MARTIN_at_libertis.ga)
Date: 08/24/04
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Date: Tue, 24 Aug 2004 15:12:07 +0100 To: <pen-test@securityfocus.com>, <security-basics@securityfocus.com>
Hi List,
I am wondering what was the most secure way to allow users to access pages after authentication, i.e.: user authenticates in toto.asp, and after that, access is granted to tata_1.asp, tata_2.asp, ..., tata_n.asp. The trouble is obviously to ask the user once for his login / password (just in tot.asp), and to allow him to get to the other pages without asking each time his credentials.
Googling around, I saw a couple of ways to meet my needs, but all seem to be weak:
- I can set a hidden field where I can say "yes, he is authenticated" or "no, he is not", but anyone a little bit skilled can create a fake request having this set up by hand (with a proxy ! ),
- I can check a session number or smth like that on each page...but this does not seem very reliable,
- I can check IP adress...but when you use AOL for instance, IP adresses can change !
So none of the ways I found seem to be the best...
Cheers list, for any reply / clue !
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