Abstract: Virtualization platforms and management clients therefor are communicatively coupled to one another via a control layer logically disposed therebetween. The control layer is configured to proxy virtualization management commands from the management clients to the virtualization platforms, but only after successful authentication of users (which may include automated agents and processes) issuing those commands and privileges of those users as defined by access control information accessible to the control layer. The control layer may be instantiated as an application running on a physical appliance logically interposed between the virtualization platforms and management clients, or a software package running on dedicated hardware logically interposed between the virtualization platforms and management clients, or as an application encapsulated in a virtual machine running on a compatible virtualization platform logically interposed between the virtualization platforms and management client.