[Idea] User permissions on a server

This issue has been migrated from [#7731](https://github.com/matrix-org/synapse/issues/7731).

---

I wonder how I can manage new users permissions: for example, what can do a new registered user (create a room ? ...)

A solution could be a user management panel, or something similar to this, which allow to create or delete user roles, set default roles for people which login (with ldap module for example).

For organizations, this could seriously compete with teams

As mentioned in a issue of riot-web, matrix and Synapse do not currently expose APIs to manage user permissions.