From Formal Access Control Policies to Runtime Enforcement Aspects

摘要

We present an approach that addresses both formal specification and verification as well as runtime enforcement of RBAC access control policies including application specific constraints such as separation of duties (SoD). We introduce TemporalZ, a formal language based on Z and temporal logic, which provides domain specific predicates for expressing RBAC and SoD constraints. An aspect-oriented language with domain specific concepts for RBAC and SoD constraints is used for the runtime enforcement of policies. Enforcement aspects are automatically generated from TemporalZ specifications hence avoiding the possibility of errors and inconsistencies that may be introduced when enforcement code is written manually. Furthermore, the use of aspects ensures the modularity of the enforcement code and its separation from the business logic.