Using the username field pre-authentication to do home realm discovery?

[Sean F]

Hi. I'm curious if CAS can be used to do home realm discovery after the user enters their username?

My proposed workflow would be:

1. User enters a username

2. The authentication strategy would depend on what the user entered by looking up the username with a REST service (or some other strategy)

3. One type of username would use LDAP authentication, a different type of username would be sent to Azure AD to complete the authentication.

Thanks!

[Mohamed Amdouni]

Hello,

I think that it could be possible using pac4j (cas delegated authentication) and you choose the dynamic type with some groovy scripts : 

https://apereo.github.io/cas/6.5.x/integration/Delegate-Authentication.html

But I don’t know if you can process the ldap authentication with the same cas instance or you can delegate to a second instance. To test…

Best regards 

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[Ray Bon]

Sean,

If you have multiple authentication sources (cas.authn. properties), cas will check each one for the username, and stop when when authn completes. This will work if each username is unique across realms or you can put authn sources in an order that would catch users, in multiple realms, with their main realm.

I seem to remember a discussion on the list about two step authn (enter username on one page, then password on the next).

Ray

On Mon, 2023-11-27 at 18:45 -0800, Sean F wrote:

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