AEGIS: An Automated Permission Generation and Verification System for SDNs.

An important consideration in Software-defined Networks (SDNs), is that one SDN application, through a bug or API misuse, can break an entire SDN. While previous works have tried to mitigate such concerns by implementing access control mechanisms (permission models) for an SDN controller, they commonly require serious manual efforts in creating a permission model. Moreover, they do not support flexible permission models, and they are often tightly coupled with a specific SDN controller. To address such limitations, we introduce an automated permission generation and verification system called AEGIS. A distinguishing aspect of AEGIS is that it automatically generates flexible permission models and yet is completely separated from an SDN controller implementation. To demonstrate the feasibility of our approach, we implement a prototype, evaluate its completeness and soundness, and examine its usability in the context of popular SDN controllers.