Authorization Models → Least-Privilege Evidence

Authorization models shape not only how systems grant or deny access but also the evidence organizations can provide during SOC 2-style access reviews to demonstrate least privilege. RBAC offers familiar role-assignment records that simplify broad reviews but can obscure unnecessary permissions and lead to unmanageable role proliferation, while ABAC records policy conditions and contextual attributes, providing stronger context-dependent justification but requiring reliable attribute histories. ReBAC uses direct or inherited relationships between users and resources to explain why access to a specific object was allowed, though large relationship graphs require effective reporting and explanation tools. Many production systems combine roles for capabilities, attributes for context, and relationships for resource-specific access, making clear logging and traceability essential. The central goal is evidence continuity from policy model through enforcement to review, enabling reviewers to determine not merely whether access was granted, but why it was appropriate.

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