Hello, 
I have an app that needs to be accessible to (and only accessible to) users from two 
different NT domains. Of course, with users in a single NT domain you can just use 
challenge/response authentication on the directory in question. But this application 
calls for authenticating users from two entirely separate domains. I see a lot of 
possible solutions to this, but am having a hard time sorting them out.

The goal is to allow the users to still use their NT domain username/passwords to log 
in. Here is my favorite idea, but I'm not sure it'll work: 

Have users them log in on their own respective server so challenge/response 
authentication for each separate domain can be used. They would login to a page like 
"www.domainXXXX.com/authenticate/login.cfm". If successfully authenticated, login.cfm 
would redirect the user to a page in the actual application's domain/directory like 
"www.ApplicationDomain.com/app/firstTime.cfm". firstTime.cfm would set up some session 
variables to ensure the security for the remainder of the user's session.

The problem is that firstTime.cfm has to somehow recognise whether the user was logged 
in and properly redirected from domainXXXX.com/authenticate/login.cfm. I'm not sure 
what would be passed from login.cfm to firstTime.cfm, or how it would be securely 
passed. I'm thinking of things like checking #CGI.HTTP_REFERRER# for a list of valid 
URLs (remember there are multiple servers people are logging in from), or passing some 
sort of encrypted url variable when redirecting to firstTime.cfm. How can 
firstTime.cfm tell that the user was actually authenticated and redirected from 
login.cfm?

Also, knowledge of the specific username is not necessary. Just the fact that they're 
logged in or not is sufficient.

Can anyone make sense of this issue? Or say that it can't work?

Thanks
Mike Mertsock
Alfred University Web Team


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