Kentico Authorization Attribute for Kentico MVC, provides a [KenticoAuthorize] Attribute that you can add to your ActionResult methods that can allows for permissions on:

1. User Authenticated
2. User Names
3. User Roles
4. Page ACL Permissions

Available both in it's base package, and one for the Dynamic Routing (detects the current page using Dynamic Routing).  For Kentico Xperience 13, the normal implementation is compatible with the built in Page Routing.