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Access control policies are used to restrict access to sensitive records forauthorized users only. One approach for specifying policies is using role basedaccess control (RBAC) where authorization is given to roles instead of users.Users are assigned to roles such that each user can access all the records thatare allowed to his/her role. RBAC has a great interest because of itsflexibility. One issue in RBAC is dealing with constraints. Usually, policiesshould satisfy pre-defined constraints as for example separation of duty (SOD)which states that users are not allowed to play two conflicting roles.Verifying the satisfiability of constraints based on policies is time consumingand may lead to errors. Therefore, an automated verification is essential. Inthis paper, we propose a theory for specifying policies and constraints infirst order logic. Furthermore, we present a comprehensive list of constraints.We identity constraints based on the relation between users and roles, betweenroles and permission on records, between users and permission on records, andbetween users, roles, and permission on records. Then, we use a general purposetheorem prover tool called Prover9 for proving the satisfaction of constraints.

Automated Verification Of Role-Based Access Control Policies Constraints Using Prover9