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A browser-based engine can read an OpenAPI description, plan a sequence of operations, ask the user to approve each step, and attach credentials to each call. It cannot decide who is allowed to access an API. Authorization has to be decided and enforced by the authorization server, the API, or a gateway that every request must pass through. The engine’s job is to make the chain legible, request only the access each step needs, and avoid calls the user did not intend. Only server-side enforcement justifies the word “zero-trust.”
OpenAPI describes operations, parameters, responses, and security requirements. It does not define how steps are sequenced, how one step’s output feeds the next, or how failures are handled. The chain runner is a design you build on top of those descriptions, and its security depends on how you build it.
What OpenAPI tells the engine about security
OpenAPI declares security through the security field, which can appear at the document root and on individual operations. An operation-level value replaces the root-level value for that operation, so the engine must compute the effective requirement for each operation instead of reading the root once. The OpenAPI Specification v3.2.1 defines these semantics.
| Declaration | Meaning for the engine |
|---|---|
Root security array |
Default requirement list for operations that do not declare their own. |
Operation security array |
Replaces the root list for that operation. An empty array removes the requirement for that operation. |
| Several Security Requirement Objects in one array | Alternatives. Satisfying any one listed object is enough. |
| Several schemes inside one Security Requirement Object | A conjunction. Every named scheme must be satisfied together. |
An empty object {} in the array |
Anonymous access is one of the permitted alternatives. |
| OAuth scopes listed under a scheme | The scopes the description says that operation requires from that scheme. |
The alternative-versus-conjunction distinction is where chain runners most often go wrong. A runner that treats every listed scheme as required will ask for credentials an operation does not need. A runner that treats the whole array as one requirement will fail to use the alternatives an operation actually accepts. Here is an example of a description where a read accepts either a token or anonymous access, and a delete requires two schemes together:
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paths:
/orders:
get:
security:
- billingOAuth: [orders:read]
- {}
delete:
security:
- billingOAuth: [orders:write]
apiKey: []
In this example, billingOAuth and apiKey must be defined under components.securitySchemes. The GET operation can run with an orders:read token or with no credentials. The DELETE operation needs both schemes in the same request.
The description records intent, not behavior. The deployed API may enforce something different. Verify each operation in a test environment by calling it three ways, with no credentials, with a token that lacks the listed scope, and with a valid token, and recording the status codes. A mismatch is a finding about the API, and the engine should surface it rather than hide it.
Where the trust boundary actually sits
Three components take part in every chain. Only the third can make the decision that counts.
- Browser engine. It parses the description, builds the plan, asks for consent, attaches tokens, and displays what happened. It is a public OAuth client, and its code can be read and modified by whoever controls the browser.
- Authorization server. It authenticates the user, issues tokens, and must enforce PKCE for browser clients.
- Resource server or gateway. It evaluates each operation request and decides whether to honor it.
NIST’s zero-trust model rests on the same split. NIST SP 800-207, published in 2020, describes a policy decision point that evaluates access and a policy enforcement point on the path to the resource. A NIST blog post by A. Kerman of the National Cybersecurity Center of Excellence states the requirement this way:
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Source: NIST, “Zero Trust Cybersecurity: ‘Never Trust, Always Verify’”
NIST SP 800-207A, finalized September 13, 2023, applies the model to cloud-native applications and names the enforcement components involved: API gateways, sidecar proxies, and application identity systems.
When the zero-trust label is justified
The label holds only when all of the following are true. If one fails, the engine is a client-side guardrail, and the documentation should say so.
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- That enforcement point decides each request from the identity, scope, and resource context, not from the fact that an earlier call succeeded.
- No route to a protected resource bypasses the enforcement point.
- Tokens are scoped to what the operation needs.
Client-side checks protect an honest user from mistakes: calling the wrong operation, requesting more scope than a step needs, or running a write without confirmation. They do not protect the API from a user who edits the JavaScript, replays a request, or calls an endpoint directly with a token they hold. Build the server side as if the client were hostile.
Treat each chain step as its own request boundary
A chain is a plan with explicit data dependencies, not a stream in which every response flows freely into the next call. Record each step as its own object, and bind every input to a named output of an earlier step. The fields below are the minimum a runner should keep for each step.
Rank #3
| Field | What the engine records | Why it matters |
|---|---|---|
| Target server | Base URL resolved from the description’s servers entry |
Stops a step from silently calling a different host |
| Method and path | Operation identifier and path template | Makes the request visible before it is sent |
| Effective security | Requirement after root and operation overrides are applied | Determines which credentials the step needs |
| Requested scopes | Scopes for this step only | Supports least privilege |
| Input bindings | Which earlier output fills each parameter | Makes data flow reviewable |
| Expected response | Success status and the fields later steps use | Detects drift between the description and the API |
| Side effect | Read, or write with a plain-language description | Decides whether the user must confirm the step |
Do not infer side effects from the HTTP method alone. A POST can be a read, and a GET can change state in a poorly designed API. Take the classification from the API owner’s documentation, or label it manually in the chain definition.
The following hypothetical three-step chain against a billing API shows how the fields apply:
| Step | Operation | Security and scopes | Side effect | Input binding |
|---|---|---|---|---|
| 1 | GET /orders?status=disputed | billingOAuth, orders:read | Read | None |
| 2 | GET /orders/{orderId}/payments | billingOAuth, payments:read | Read | orderId from an item returned by step 1 |
| 3 | POST /orders/{orderId}/refunds | billingOAuth, refunds:write | Write: creates a refund | orderId from step 1; amount from the payment total in step 2 |
For each step, the runner should do the following in order:
- Recompute the effective security requirement and confirm that the user’s current token covers the step’s scopes.
- If a scope is missing, request it through the authorization flow for that step. Do not reuse a broader token from an earlier step.
- For any step classified as a write, show the user the exact request and wait for approval.
- Send the request and compare the response with the expected status and fields.
- On a 401, a 403, or an unexpected response, stop. Report which steps completed, which step halted, and why. Do not retry with broader scope.
Halting does not undo completed writes. If step 3 succeeds and step 4 fails, the refund already exists. Unless the API defines compensating operations, the engine should show the user every completed side effect and leave the remedy to them.
Make cross-origin behavior explicit
CORS determines which cross-origin responses browser JavaScript may read. It is not an authorization decision. A permissive CORS policy does not grant access to anything, and a restrictive one does not stop non-browser clients. Configure CORS for the engine’s origin, and enforce authorization separately on the server.
Rank #4
Get the browser OAuth flow right
RFC 10017, OAuth 2.0 for Browser-Based Applications, was published in August 2026. Section 6.3.2.1 sets the baseline for an engine like this one:
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“Browser-based applications that are public clients and use the Authorization Code grant type described in Section 4.1 of [RFC6749] MUST also follow the additional requirements described in this section.”
That section continues by requiring PKCE. The authorization server must also support and enforce it, so confirm that your server rejects authorization requests that lack a valid PKCE challenge rather than merely accepting the parameter.
Use PKCE with S256
RFC 9700, Best Current Practice for OAuth 2.0 Security, says to use the S256 method, which does not expose the code verifier in the authorization request. Use S256 in every flow the engine starts.
Bind the callback to the transaction
- Create a new state value and PKCE verifier for each authorization attempt, and tie both to that browser transaction so a callback started elsewhere is rejected.
- Defend the redirect URI against CSRF, and match redirect URIs exactly as registered.
- Never redirect to a destination taken from a query parameter. That is an open redirect.
Handle multiple authorization servers
If a chain touches APIs protected by more than one authorization server, a mix-up attack can make one server’s response be interpreted as coming from another. Validate the issuer information in each response, or use another mix-up defense prescribed in RFC 9700. Associate every token with the issuer that issued it, and never send a token to an API that a different issuer protects.
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Store tokens with stated assumptions
RFC 10017 requires browser clients to store tokens as securely as possible using appropriate browser APIs. That is a duty to do the best available, not a guarantee. Browser storage is limited, and malicious code running in the application’s context can use whatever the application can use. Refresh tokens need particular care, because a leaked refresh token can be used to obtain further access tokens.
Document which tokens live only in memory, which (if any) persist across page loads, how long each lasts, and what happens when the tab closes. Those choices define your threat model; without them, “secure storage” is an unqualified claim.
Choose an architecture by where enforcement lives
Four decisions shape the design. Each one moves the trust boundary or the point where enforcement happens.
| Decision | Option A | Option B | What to weigh |
|---|---|---|---|
| Token handling | Browser-only public client holding its own tokens | Token-mediating backend acting as a confidential client | Browser-only avoids a backend, but code and tokens stay in the browser runtime. A backend changes the trust boundary and adds operational work. |
| Call path | Direct calls to each resource server | Gateway-mediated calls | A gateway places one enforcement point on every path, but it becomes a critical component, and it only works if no path avoids it. |
| Consent | Per-operation scopes requested as each step runs | Broad pre-authorization at the start of the chain | Per-step requests give least privilege and clearer prompts, but they interrupt the chain. Broad pre-authorization runs smoothly but gives every write step more access than it needs. |
| Issuers | One authorization server | Multiple authorization servers | Multiple issuers require mix-up defenses and transaction binding for every step that crosses a boundary. |
A browser-only design is reasonable when the APIs accept public clients using PKCE and the server-side boundary is strong. Choose a backend or gateway when the chain needs confidential credentials or central policy that should not depend on the browser behaving correctly. State these deployment assumptions in the engine’s documentation so operators know which guarantees they are relying on.
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What the design cannot establish
- Tampering. Anyone can change the client code, edit requests, or call the API with a token they hold. Server-side checks must hold regardless.
- Bypass paths. If an API is reachable without passing through the gateway or policy point, the client-side plan is no barrier on that route.
- Spec drift. OpenAPI declarations describe intent, and the deployed API may behave differently. Use the three-way verification described above, and treat each mismatch as a defect to report.
- Performance and usability. No benchmark, latency measurement, or user study exists for this design. The controls described here are recommendations, not measured results, and have not been penetration-tested.
- Currency. RFC 10017 was published in August 2026. Check its datatracker page for current status and errata before you rely on it. This article is written against OpenAPI Specification v3.2.1, so confirm the version your descriptions target.
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