[Mediawiki-l] Hook for special grouplist?

[Jens Vieler]

dear group,

i'm using mediawiki1.9.3 with LDAP_Authentication 1.1d. for some reason, 
   there aren't any group-enrties that i need in our ldap, so i have to 
use an other special grouplist.

what i want is:

- user authenticates with his ldap-account/password against our 
directory-server (works), *and*

- user is in my grouplist (handmade list, or database-connection to a 
infosystem with group-information).

so my question is: where to put a hook, that users who aren't in my list 
    will not be able to login?

regards
  jens