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Role-based access control (RBAC) grants access by assigning permissions to roles and assigning users to those roles. Instead of defining each person’s access separately, administrators manage permissions through job functions or responsibility groups, subject to role authorization and other constraints.
What is role-based access control?
NIST’s glossary defines RBAC as “A model for controlling access to resources where permitted actions on resources are identified with roles rather than with individual subject identities.” In practical terms, administrators associate permissions with roles, then assign authorized users to those roles. A role can reflect a job function or another organizational responsibility; it is an administrative grouping, not necessarily a person’s exact job title.
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The idea is that access decisions are mediated through roles rather than being built from scratch for each individual. NIST authors Ferraiolo, Cugini, and Kuhn described the model in 1995 this way: “Instead, access permissions are administratively associated with roles, and users are administratively made members of appropriate roles.” NIST’s glossary and the authors’ 1995 paper provide the definitions and historical context.
How RBAC works
The model connects users, roles, permissions, and resources. A permission authorizes an operation on a protected resource; a role groups the permissions needed for a function; and a user receives access through an authorized role.
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- Users: People or system subjects that need access.
- Roles: Groups representing organizational functions or responsibilities.
- Permissions: Authorizations to perform operations on protected resources.
- Resources: The objects or systems on which permitted operations can be performed.
For example, an organization could give a “payroll clerk” role permission to enter payroll information, then assign authorized staff to that role. The role carries the permissions; the staff member’s access comes through role membership.
NIST’s FAQ describes three rules in the original formal model: role assignment, role authorization, and transaction authorization. Applied to a request, the subject must be assigned or select a role, that role must be authorized for the subject, and the requested transaction must be permitted through that role. Applicable constraints also have to be satisfied. See NIST’s RBAC FAQ.
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Role hierarchies and separation of duty
RBAC can include features beyond basic user-to-role and permission-to-role assignments. NIST identifies four components in its standard description:
- Core RBAC covers the basic assignments and role activation in a user session.
- Hierarchical RBAC adds relationships between roles, which can allow permissions to be inherited through a hierarchy.
- Static separation of duty provides constraints on role assignment.
- Dynamic separation of duty provides constraints on role use, including in a session.
These features can help encode limits on who may hold or use certain combinations of roles. However, implementations may support different combinations of the components. The label “RBAC” alone does not establish that a particular system supports role hierarchies, either form of separation of duty, or every feature in the formal model. NIST discusses the components in its RBAC project overview and 2011 appraisal.
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RBAC’s standard and historical context
NIST’s archived project page says the model was adopted as ANSI/INCITS 359-2004 and revised as INCITS 359-2012. The page also says the project is no longer supported or updated, so it documents historical standard information rather than confirming the standard’s present status. For a current compliance or procurement claim, verify status with the standards publisher.
NIST’s historical sources include Ferraiolo, Cugini, and Kuhn’s 1995 paper on RBAC’s features and motivations, and Wayne Jansen’s 1998 report, which presents a revised formal model including role hierarchies. Jansen describes RBAC as “a class of security mechanisms that mediate access to resources through organizational identities called roles.” These works explain the model’s foundations; they do not prove that a specific current product conforms to a standard. NIST’s 1995 paper and 1998 report are available as primary references.
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What RBAC does—and does not—tell you
RBAC describes how permissions can be organized and granted through roles. It does not, by itself, specify which roles an organization should create, guarantee that role assignments are correct, or establish that a particular implementation supports all optional features. When evaluating an implementation, check which components it supports and how it handles role assignment, session activation, hierarchies, and separation-of-duty constraints.
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