Blocking users from adding contacts

Hi I currently have all my users setup using a shared roster. I do not want certain users to be able to add new contacts to their roster. How do I stop them? Do I use an ACL?

There aren't ACL and ACCESS

There aren't ACL and ACCESS for mod_roster. Some solutions would be to implement a blocking mechanism in mod_roster, or a filtering of 'register-contacts' in mod_filter.

The first solution is proposed here: Add access rules to mod_roster

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