Include new attribute

Hi Gurus!

I'm working with a Portal customized to validade users in the LDAP system. It's working!

My problem is: I need to check a specific property of the user before the authentication process starts.

How are the possibilities to do this?

- Is it possible to do this modifying the authschemes.xml or datasourceConfigurationXXXX.xml? What changes would be necessary?

- Other way would be changing the com.sap.portal.runtime.logon.certlogon? Could be?

Thanks in advance

Adriano Oliveira