Externalized Authorization
Externalized Authorization is an access control model where applications delegate access decisions to a dedicated authorization service.
Definition
Externalized Authorization is an architecture in which applications, APIs, gateways, or services do not embed all access control rules in their own code. Instead, they query a specialized authorization service at decision time, which evaluates policies, attributes, and context to determine whether access should be allowed, denied, filtered, or constrained.
Why it matters
Externalizing authorization enables centralized policy management, consistent enforcement, and faster adaptation to changing access requirements across the application landscape.
The Ariovis perspective
Authorization policies should be separated from application code when consistency, auditability or scale require it. Enforcement remains close to the resource while the decision is governed independently.
Related services
Common pitfalls
- A common mistake is externalizing only coarse-grained checks while leaving fine-grained authorization logic embedded in application code.
Standards and protocols
- NIST SP 800-178
- XACML
- Open Policy Agent (OPA)
Resources
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