In our company exists a forest-wide UPN suffix
company.com and almost all user accounts have the explicit UPN set to
firstname.lastname@example.org. This value is also set in the Active Directory
Now we have an application where users perform authentication through Kerberos. So we are given the Kerberos principal, i.e. implicit UPN. We'd like to look up that user and retrieve several LDAP attributes. Since iUPN and
userPrincipalName do not match anymore, the lookup is not possible.
Is there any "official" way to retrieve a mapping from the Active Direcory? My workaround is to perform a LDAP bind against the realm component and search for the
sAMAccountName attribute which matches the user id component of the iUPN. Searching for the mere
sAMAccountName in the forest is not possible because the value is unique in the domain only.