[xwiki-users] Using LDAP for page access rights with Kerberos auth

I have an XWiki setup that uses Kerberos for authentication. I would like to continue using Kerberos, but use LDAP groups for controlling page access rights. How could I do this? (If you could point me in the right direction, or to any appropriate documentation, that would be a big help) Thanks in advance —Debajit