How to pass user credential to IDP initiated SSO

[Ismail M. Mohammed]

Dear Support team,

I have all my users in database and I have to authenticate a user applying some logic before validating against DB
I am following  https://wiki.shibboleth.net/confluence/display/SHIB2/IdPAuthExternal for authentication to apply custom logic.
As a POC, When I try with user hard coded in external servlet, I  am able to redirect to SP successfully

Here is my usecase:
I am opting for IDP inititated workflow.
I have a link (https://idp.ps.org:8443/idp/profile/SAML2/Unsolicited/SSO?providerId=https://xyz..com) in our  application to redirect to SP  , when I click the link how do I  pass the credential to the IDP and authenticate in custom servlet ?


Regards
Ismail

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