Thanks for picking this up, David.

> A TGT is created to establish the Single Signon Session with the
> client. An ST (service ticket) is created for a specific application 
> to enable retrieving the identity and attributes of the client (one time use).
> 
> This picture might help: http://goo.gl/E75V7O

That picture represents the flow between client, CAS server and possible other 
services though, and I looked at that, but it doesn't really tell me about the 
flow inside the CAS server (which is where I'm having trouble understanding how 
things hang together). :-/

> There are a number of "CAS Clients" and each has a different way of
> releasing the subject and attributes to the protected application.

What is 'the subject'? Is that the principal object? 

If so, can the principal differ from the actual credentials used, for example, 
if I use an authenticator to authenticate 'b...@uni.edu', the principal would 
not necessarily be 'b...@uni.edu' or even 'bob', but perhaps 's55694', correct? 
That depends on the credential-to-principal resolver, right?

> The "mod_auth_cas" apache module will use HTTP headers and also the
> apache "REMOTE_USER" environment variable which can be used by apache
> itself and is passed on in AJP proxying.   Which client are you using?

I don't know which one to use because I have various applications (some Java, 
some non-Java) and because I don't know what will be returned when. Hence my 
question.

> This question comes up on occasion; others can answer better.  I think
> that in CAS 4.0, these steps (authentication and attribute retrieval)
> are combined, so you don't have the same issue.

If this is the case, then this might resolve my problem that I'm experiencing 
at the moment. So yeah, if one of the CAS devs could answer this one, that 
would be great.

With Regards

Stefan


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