Access Control Patterns

Purpose

Access control patterns specify how permissions are defined, evaluated, and enforced for actions on protected resources. Their role is to ensure actions are permitted only when explicitly authorized under documented rules and context.

Role-Based and Capability-Based Controls

Role-based control assigns permissions via predefined roles, while capability-based control grants explicit permissions for specific actions. Roles express responsibility boundaries; capabilities express precise operational rights.

Separation of Concerns Between Actors

Access control requires separation between actor categories (for example, users, operators, automated services, and auditors). Each category operates under isolated permission sets to reduce unintended cross-role influence and privilege escalation risk.

Contextual Authorization Rules

Authorization is evaluated against identity and contextual parameters such as action type, resource state, and execution phase. Context binding prevents valid credentials from being reused outside their intended operational conditions.

Deterministic Permission Evaluation

Given the same actor identity, permission set, and context inputs, the authorization outcome should be consistent. Deterministic evaluation supports review and repeatable analysis of access decisions.

Immutable Permission Definitions

Permission definitions and role mappings are treated as controlled configuration artifacts. Changes to access rules should be versioned and tracked so historical actions can be interpreted against the rule set that was active at the time.

Auditability of Access Decisions

Each access decision should be attributable to the actor identity, the evaluated policy or rule set, and the relevant context inputs. This enables reconstruction of why an action was permitted or denied without relying on subjective interpretation.

Boundary Conditions

This page describes authorization boundaries and permission evaluation patterns only. It does not define business correctness, fraud determination, policy compliance outcomes, or any system-wide guarantee.

Non-Goals

Not a security certification. Not a guarantee of safety, correctness, or enforcement outcomes. Not a substitute for independent testing or review of specific implementations.