> I have the following setting working well in my case - CustomCredentials, 
> CustomCredentialsToPrincipalResolver and a CustomAuthenticationHandler. I 
> have a tweaked casServiceValidationSuccess.jsp through which I do the 
> attribute release.

We'll try to help, but you're in the land of the unsupported with that approach.

> Now my requirement is to (also) intercept login form request parameters (lets 
> say email or emp id) and release it back from attribute repository. How can I 
> do that?

With a lot of hacks, I'd imagine.  CAS simply lacks support for
querying the attribute repository from the login webflow.  Attributes
are released in response to services authenticating from CAS, not from
user authentication.  In any case you will need to substantially
modify the login webflow.  The only further guidance I can provide is
that your extensions should come after user authentication/principal
resolution since the authenticated principal name would be required to
query the attribute repository.

M

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