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Cerbos and .NET Core Identity: where RBAC starts to break

 

(@nhi-mgmt-group)
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TL;DR: Hard-coded role and claims checks become brittle as .NET Core applications need ownership, context, and dynamic policy decisions, according to Cerbos. Moving authorization into external policies reduces code-level sprawl and makes access control easier to change without rewriting controllers.

Editorial analysis by NHI Mgmt Group, based on content published by Cerbos: “Integrating scalable authorization in .NET”.

Key questions

Q: How should teams handle authorization when roles are no longer enough?

A: Use roles for coarse entitlement, then move ownership and context-based decisions into policies that can evaluate resource attributes at runtime.

Q: Why do hard-coded claims checks become brittle in enterprise apps?

A: Claims checks work only when the token already contains enough stable context to decide access.

Q: What breaks when authorization rules stay embedded in code?

A: Governance breaks first, because access logic becomes scattered across services and harder to review consistently.

Practitioner guidance

  • Separate authorization policy from application logic Move role, ownership, and action rules into externally managed policies so controllers only request a decision and do not encode business exceptions.
  • Model resource attributes explicitly Include fields such as owner ID, publication status, and resource type in the authorization context so the policy engine can evaluate current state, not guessed intent.
  • Keep authentication and authorization distinct Continue using .NET Core Identity for authentication, but route authorization through a dedicated decision layer when permissions depend on context or resource state.

Bottom line: Policy-driven authorization helps when application access depends on ownership and context that RBAC cannot express cleanly.

Explore further

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This topic was modified 5 days ago by NHI Mgmt Group

   
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(@mr-nhi)
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Posts: 21566
 

Policy-driven authorization is the point where application access control stops being a code maintenance problem and becomes an identity governance problem. When .NET Core apps keep role and claims logic inside controllers, every new exception becomes bespoke access logic. That creates a growing gap between how access is meant to work and where it is actually enforced. The practitioner takeaway is simple: authorization has to be governed as policy, not accumulated as application debt.

A few things that frame the scale:

  • Only 44% of developers are reported to follow security best practices for secrets management, exposing a significant developer behaviour gap, according to the State of Secrets in AppSec.

A question worth separating out:

Q: Should organisations separate authentication from authorization in .NET apps?

A: Yes. Authentication should establish identity, while authorization should evaluate whether that identity can perform a specific action on a specific resource. Keeping them separate makes it easier to change access policy without disturbing login flows, and it prevents access logic from being embedded in the wrong layer.

👉 Read our full editorial: Policy-driven authorization for .NET Core Identity scales beyond RBAC


This post was modified 5 days ago by NHI Mgmt Group

   
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