Role-Based Access Control (RBAC) for B2B SaaS

Role-based access control (RBAC) authorizes users through named roles that bundle permissions, separating authorization from authentication and allowing people to hold different roles within different SaaS tenants or workspaces. Its core structure links users to roles and roles to permissions through many-to-many assignments, avoiding direct user permissions and simplifying administration, revocation, and audits. The original NIST proposal described flat, hierarchical, constrained, and symmetric RBAC levels, while the later ANSI standard reorganized these as Core RBAC, optional review functions, role hierarchies, and static or dynamic separation-of-duty components. For most B2B SaaS products, the recommended starting point is flat or Core RBAC with job-function roles such as Owner, Admin, Member, and Billing Manager; hierarchies should be added only when duplicated permissions become difficult to manage, while separation of duty is mainly relevant to regulated or finance-related use cases. RBAC is generally more reviewable and auditable than attribute-based access control (ABAC), though ABAC better handles context-sensitive conditions such as time or location, and relationship-based access control (ReBAC) is more suitable for nested ownership, sharing, and graph-shaped permissions. A practical approach is to use RBAC as the primary model, layer attribute checks where request context matters, and consider ReBAC for deeply relational authorization needs.

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