PEP, PDP, and Decision Logs: The Architecture Behind “Prove It”

Authorization architectures designed for regulatory scrutiny require more than identity-provider login records: they need Policy Enforcement Points (PEPs) in applications to enforce access decisions, Policy Decision Points (PDPs) to evaluate policies, and structured decision logs to document who requested which action on what resource, under what conditions, and why it was allowed or denied. The described hybrid model uses a managed control plane for policy administration and governance while running local PDPs near applications to reduce latency, improve resilience, and limit privacy concerns associated with remote-only authorization calls. OPAL distributes updated policies and authorization data, such as roles, tenant membership, relationships, and resource attributes, to local PDPs in real time without requiring service redeployments. Detailed decision logs provide auditable evidence for access reviews, incident investigations, and control assessments, helping organizations demonstrate that sensitive actions are consistently enforced, granularly modeled, current with changing data, and explainable after the fact.

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