Roles and Permissions for users


Hi,

Im rather new to Elgg and I have a questions about users and permissions.

For my project I want to have 4 kinds of users. These users should have different rights. Therefore I need roles.
E.g a group should only be allowed to create by a specific role.

Can someone tell me, if there is an existing plugin, that handles roles and permissions.
Or any other solutions.

Many thanks
Carina