Need to restrict access to modify contact list

Hi, all,

I'm trying to configure an XMPP server where each user is already assigned a
username/password and is allowed access from any client. While it is on an
open network accessible from anywhere on the world wide web, I would like to
have each user's contact list maintained only by an admin. In other words,
each individual user is not allowed to add or remove another user from their
predefined contact list, and they are unable to even contact other users
outside of their contact list.

I see that most jabber servers allow you to configure your server so that
you can assign users groups and their own lists, but still allow them to
modify their assigned list. Are there any out-of-the-box XMPP servers that
restrict access in this way?

Thanks in advance.

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