Disallowing Wildcard Searches ?

[Jerry Nicholls <Jeremy.Nicholls@supanet.net.uk>]

Hi,

I've searched both the web and the mail archives but can find no
examples or reference to this - Is it possible to deny wildcards in
searches ? 

Basically I want a setup (a simple contacts list) where if you aren't an
authenticated user you cannot do a search using a filter such as
"(mail=*)". You can only perform explicit searches.

For reference I'm using openldap 2.0.21. I have all the rest of the ACL
stuff sorted out bar this one part.

Many thanks,
Jerry.