Role-Based Access Control

Role-based access control (RBAC) is a method of restricting access to digital information and system functions according to a user's assigned organisational role. Instead of giving each person permissions separately, the system assigns permissions to roles and assigns users to those roles. It is an authorisation mechanism: it determines what a user may do, rather than merely verifying who the user is.

How role-based access control works

RBAC connects users to permissions through roles that represent job responsibilities, such as doctor, laboratory technician or administrator.

• A permission allows a specified operation on a resource, such as reading a patient record, entering a test result or modifying an account.
• A role groups the permissions needed for a function; users receive access through their assigned roles rather than through individually configured permissions.
• A user may hold multiple roles, and the same role may be assigned to many users.
• For example, a hospital could allow laboratory technicians to enter test results while restricting billing staff to information needed for billing.

Principles for designing roles

Effective RBAC requires carefully defined responsibilities and regular review of who holds each role.

• Least privilege means giving each role only the permissions needed for its tasks; adopting RBAC does not automatically guarantee this.
• Separation of duties divides sensitive responsibilities among different roles, such as creating a payment request and approving it.
• Role hierarchies can allow one role to inherit another role's permissions, reducing duplication where responsibilities overlap.
• Role assignments should be updated when employees change responsibilities or leave, so that unnecessary access does not persist.

Benefits and limitations

RBAC makes access administration more manageable because a change to a role's permissions applies to users receiving access through that role. It also supports consistent enforcement and review of access rights.

• Overly broad roles can expose sensitive information, while too many narrowly defined roles can make administration complex.
• RBAC does not by itself prevent an authorised user from misusing permitted access; audit logging, monitoring and staff training remain important.
• RBAC complements authentication, encryption and other safeguards rather than replacing them.