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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsAuthorization decides whether a user, service, or process may perform a particular action on a particular resource. To implement it well, state that decision explicitly, choose a model that fits its inputs, enforce the policy on every request, and review privileges as responsibilities change.
What is the difference between authentication and authorization?
Authentication establishes or verifies an identity. Authorization decides whether that subject may access a system object or perform an operation. A successful sign-in therefore does not, by itself, grant permission to read a record, edit a project, or invoke an administrative function. NIST describes authorization as the decision to permit or deny a subject access to system objects, including networks, data, applications, and services (NIST glossary: authorization; NIST SP 800-162).
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How do you state an authorization rule?
Before encoding a policy, write down the decision in ordinary language. Identify the subject, the requested action, the target resource, and any context that could change the outcome. For example: “A project member may read project records; only an editor may change them.” This is an illustrative rule, not a universal policy.
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- Subject: the user, service, or process making the request.
- Action: the operation, such as read, update, delete, or approve.
- Resource: the object or service the action concerns.
- Context: relevant attributes or relationships, such as membership, ownership, or a resource classification.
Making these inputs explicit helps reveal whether a simple role check is enough or whether the policy depends on resource-specific or contextual facts.
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Should you use RBAC, ABAC, or ReBAC?
Choose according to the facts that actually determine access, not because a model is fashionable. OWASP and NIST describe approaches that encode different decision inputs; applications can also combine them when that remains understandable and testable (OWASP Authorization Cheat Sheet; NIST SP 800-162).
| Model | Decision basis | Useful when | Considerations |
|---|---|---|---|
| RBAC | Permissions are associated with roles; users receive permissions through assigned roles. | Access naturally follows a manageable set of job or application roles. | Review whether role assignments still match current responsibilities and whether roles express the actual resource-level rules. |
| ABAC | Policy evaluates attributes of the subject, resource, requested operation, and potentially the environment. | Access depends on characteristics or context rather than role membership alone. | Document the attributes and rules that drive a decision so that policy behavior can be reviewed and tested. |
| ReBAC | Access depends on relationships between a subject and a resource. | Ownership, membership, or sharing determines access; for example, a post creator may be allowed to edit that post. | Keep relationship changes and their effect on access clear to administrators and reviewers. |
| Combined approach | Uses more than one kind of input, such as roles together with resource attributes or relationships. | A single model does not express the real policy cleanly. | As policy logic grows, preserve clear rules, reliable tests, and a reviewable explanation of outcomes. |
When comparing models, consider which inputs matter, the complexity of the rules, relationship handling, administrative effort, auditability, and how policy changes take effect. OWASP notes that the choice has implications across the software development lifecycle, so make it early enough to shape the application consistently.
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Where should an application enforce permissions?
Enforce authorization at a trusted point on every request that reaches a protected operation. A hidden button or client-side navigation rule can improve the interface, but it cannot protect the underlying data or action: a caller may reach the operation through a different path. OWASP advises validating permission on every request, regardless of how it was initiated (OWASP Authorization Cheat Sheet).
- Apply a consistent policy to API calls, server-rendered requests, asynchronous requests, and other routes to the same operation.
- Return a denial when the policy does not allow the requested action.
- Do not treat a client-side control or a previously displayed page as proof that a new request is authorized.
How should privileges be granted and reviewed?
Use least privilege as an ongoing operating rule: give people and processes only the access needed for their current tasks. Set a review cadence appropriate to the organization, then reassign or remove access when duties change. NIST SP 800-171 Rev. 3 calls for reviewing privileges assigned to roles or user classes at an organization-defined frequency and allowing only access needed for assigned tasks. That publication concerns nonfederal systems handling Controlled Unclassified Information; it is not a universal compliance requirement for every application (NIST SP 800-171 Rev. 3).
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How can authorization decisions be reviewed?
Make it possible to determine why a decision was made. A useful record can identify the subject, action, resource, relevant attributes or relationships, policy version, and outcome. This is practical implementation guidance, not a logging format prescribed by the cited sources. Avoid recording secrets or sensitive attribute values unnecessarily.
What should authorization tests cover?
Test both successful and denied outcomes, and check that the same protected operation cannot be reached through an unchecked route. Include cases such as:
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- A permitted subject performing the allowed action.
- A subject denied the action under the policy.
- Missing or stale attributes used in a decision.
- Ownership or membership changing after access was granted.
- A direct request that bypasses the intended user interface.
- Each API, server-rendered, asynchronous, or other path that reaches the protected operation.
These are practical test cases derived from the requirement to enforce permission on every request; they are not a claim that OWASP mandates this exact test suite.
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