Additionally I have been working on creating an authorization flow that would match group membership from Google LDAP after fetching the username from a user certificate where the CN is the email of the user.
So far I have been unable to get the External LDAP groups.
Thinking it was a problem with subject format, I tried with a dummy PAP authentication against Google LDAP identity store and I could authenticate, retrieve extra attributes but no way I could retrieve group membership.
Also I tried by adding "memberOf" as an additional attribute in the LDAP connector in ISE and when I can process the authentication with PAP I can also retrieve data from these attributes but in Wireless EAP-TLS there is no chance to go through the authentication flow (no binary comparison available for certs since Google LDAP host no user certificate...) and so I cannot retrieve any attribute to use in the authorization flow.
Long story, was anyone able to make this work or has any suggestion?