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I have the simple LDAP module installed and running, and I would like to prevent Drupal from creating a new user after a user authenticates if it does not already exist in Drupal.
I found the function 'simple_ldap_user_load_or_create_by_name',
if (!$Drupal_user) ...
I cannot find a hook to modify this function, no way to do it without changing the module?
As you are describing it, this is not possible. You can limit authentication and user creation to only LDAP accounts, but you must have a local Drupal user.
The Simple LDAP module's Simple LDAP Role submodule probably allows you to do something that would achieve the result you want (only a few people have more access than anonymous users). You can create a role in Drupal for privileged users, map that role to a group in LDAP, and then map everyone else to Authenticated user. If the authenticated user role has the same permissions as Anonymous you will have a very similar effect. That module might also allow you to control which groups can authenticate at all.
To have more features and more control you likely will need to create a custom submodule or switch to the larger LDAP module. The LDAP Module is powerful and useful, but not the best supported module in the community.
