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A RAG API can be designed so that it never receives a user’s password and never holds the authority to sign tokens. That is a real separation of duties, and it removes two high-value secrets from the component that talks to the model and the document index. It does not make the API authorization-free, and it does not make the retrieval pipeline safe. The API still has to decide, on every request, whether the caller may perform the operation and see the data. The retrieval layer carries its own data-boundary risks that no token design resolves by itself.
What the title promises and what it does not
The title makes two negative claims about one component: the API has no visibility into passwords, and the API has no token-signing authority. Neither claim is a statement about the whole system. Read literally, the title says nothing about:
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- Whether credentials cross the API boundary. A bearer token or another credential may still arrive with every request, because the API has to know who is calling.
- Whether authorization happens in the API. Removing passwords and signing keys from the API says nothing about whether it checks permissions.
- Whether retrieved documents respect those permissions. That depends on how content is ingested, indexed, and filtered.
- Which identity provider, token format, session strategy, or key-management scheme is in use. The title does not name one, and each deployment must specify its own.
Treat the title as a statement about one design choice. Whether a given system has made that choice, and whether it holds up, is a question for its own architecture review.
Where passwords and signing authority belong
The architecture implied by the title assigns three jobs to trusted components outside the RAG API. OWASP’s Developer Guide advises against storing passwords in code or configuration. If an application does persist passwords, its guidance is to hash and salt them. An API that never receives a password has nothing to store, which keeps that obligation with the component that actually handles sign-in.
| Component | Password entry | Signing-key access | Responsibility in this design |
|---|---|---|---|
| Identity service | Yes, during sign-in only | No | Authenticates the person and hands off to the token authority |
| Token authority | No | Yes | Issues and signs tokens after successful authentication |
| RAG API | No | No | Validates tokens and authorizes each operation and each retrieval |
| Vector index and document store | No | No | Holds permission metadata on each chunk that retrieval filters on |
| Generation and tool layer | No | No | Validates model output and enforces tool authorization outside the model |
These are design targets for the architecture the title describes, not a documented implementation of any particular product.
How a request should move through the system
A request in this design passes through seven steps. The order matters because each step depends on the one before it.
- The user signs in at the identity service. That service is the only component that receives the password.
- The token authority verifies the authentication result and issues a signed token. Only this component can access the signing keys.
- The client calls the RAG API with the token. OWASP’s REST Security Cheat Sheet addresses how credentials are transported and how token integrity is protected, and both apply here.
- The API validates the token against trusted verification material. Whether that is done with public keys or token introspection depends on the token design the system uses. The API derives the subject, tenant, and scopes or roles from validated claims, not from fields the caller supplies in the request body.
- The API authorizes the requested operation before any retrieval runs.
- Retrieval applies permission filters so that only chunks the caller may see reach the prompt.
- The model generates a response. Any tool call it proposes is validated and authorized by the application before it runs.
Why a valid token is not an authorization decision
A valid token shows that the caller was authenticated. It does not show that the caller may perform the requested action or read the requested data. OWASP’s REST assessment guidance calls for testing whether valid credentials that lack the required scope or role are refused. That test is useful as a design check, because a token-signing service can be correct while the API still returns data it should not.
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- Operation-level access: whether the caller’s scopes or roles permit this endpoint and this action.
- Tenant identity: derived from trusted claims, and enforced on every query, not only on the first.
- Object-level access: whether the specific documents or collections named in the request belong to the caller.
Browser clients and token isolation
If the RAG interface runs in a browser, a separate concern applies. RFC 10017, OAuth 2.0 for Browser-Based Applications, discusses isolating tokens from the application’s execution context and from shared persistent storage. That concern sits on the client side and is independent of who signs tokens. An API that never signs tokens can still expose them if the front end keeps them where any script on the page can read them.
The RFC discusses this isolation. It does not prescribe the architecture described by the title, so use its guidance as a constraint on the front end rather than as a blueprint for the API.
Why RAG has its own data-boundary risks
OWASP’s AI Security and Privacy Guide, in its RAG systems overview, describes a five-stage flow: ingestion, embedding and indexing, retrieval, augmentation, and generation. Each stage is a point where data can cross a trust boundary. The same guide names cross-authorization disclosure as a risk: a document can be correctly protected at the API and still reach a user who should not see it, if its permissions were lost earlier in the pipeline. Token design does not reach into those earlier stages.
Permissions must follow each chunk
OWASP’s RAG Security Cheat Sheet calls for permission metadata on each vector chunk. Documents are split and embedded before they are searched, so a chunk must keep the access rules of its source document through those steps. Without that metadata, the API has no reliable way to tell which chunks a caller may receive.
Filter before retrieval where possible
OWASP recommends pre-retrieval filtering where it is possible. Applying permission filters before similarity search means restricted text never enters the candidate set, which is safer than retrieving broadly and removing results afterward. Where pre-filtering is not supported by the index, the system should be reviewed for what happens to restricted content in intermediate steps such as logs and prompt assembly.
Restrict index writes and treat embeddings as sensitive
Only trusted ingestion pipelines should be able to write to the index. OWASP’s guidance calls for sensitive treatment of embeddings, so they should be protected like the content they were derived from, not like anonymous numeric data.
Poisoned documents and injected instructions
OWASP warns about document poisoning, where malicious content is added to the corpus, and prompt injection, where retrieved text contains instructions the model may follow. Both are reasons to treat retrieved content as untrusted input, which the next section covers in more detail.
Response caches must be scoped
OWASP identifies cache leakage across users as a risk. A cached answer built from one user’s permitted documents must not be served to another user whose permissions differ. Cache keys need to include the permission context, or the cache must be scoped per user or per tenant.
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Failure behavior when retrieval breaks
OWASP warns about unsafe fallback behavior when retrieval fails. A fallback that answers without retrieval, or that retries against a broader index, can bypass filters that the normal path enforces. The failure path should fail closed, with the same authorization checks as the success path.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Retrieved content and model output are untrusted
OWASP’s RAG Security Cheat Sheet states the principle directly: “The model generates text — it does not enforce policy.” Policy filters, authorization, output validation, and tool controls therefore have to live in the application, not in the prompt or in the model’s judgment. Retrieved documents are also untrusted input, even when they come from an internal corpus.
In practice, that means:
- Validate generated outputs before they are displayed or passed to another system.
- Constrain which tools the model can request, and what arguments those tools accept.
- Enforce tool authorization independently of the model’s decision, so that a tool call the model proposes is checked against the caller’s permissions before it executes.
Review questions for your own system
These questions test whether a design delivers the controls described above. They do not establish that any particular system already does.
- Which component authenticates the person?
- Which component signs or mediates tokens?
- Which services can read the signing keys?
- How are scopes, roles, and tenant identity derived from trusted claims?
- Does each chunk keep the permissions of its source document?
- Are permissions checked before retrieval runs?
- Are response caches scoped by permission context?
- Are model-generated tool requests schema-validated and authorized outside the model?
What the guidance establishes and what it does not
The guidance behind this article is OWASP’s RAG Security Cheat Sheet, the OWASP AI Security and Privacy Guide’s RAG systems overview, OWASP’s REST Security Cheat Sheet, the OWASP Developer Guide, and RFC 10017. These documents describe security controls. None of them describes a tested implementation of the system the title imagines, and none provides measured results for this design. They do not quantify how often RAG attacks or password exposures occur, or how much risk the separation removes.
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OWASP’s guidance is also versioned and updated. Check the current revision of each document before relying on a specific recommendation, and confirm the identity provider, token format, session strategy, key-management scheme, and deployment topology against the actual system, since the title does not specify them.
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