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Graph/token-signing-validation-boundary-confusion

AntiPattern

Token Validation Boundary Confusion

token-signing-validation-boundary-confusion

Bearer/JWT and signing-style auth are mishandled because responsibilities blur between token creation, signature verification, and key trust; the system ends up validating or trusting the wrong secret/claims or omitting integrity guarantees, enabling spoofing, MITM, or impersonation.

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Updated7/10/2026

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30 linked nodes

MATCHESSolution

This environment variable wasn't set in my deployment. Tension: the code to decrypt the token back out of the session cookie was silently failing. Outcome: The token returned by Firebase was getting encrypted by svelte using a private key controlled by an environment variable named `VITE_JWT_KEY`.

MATCHESSolution

Fetch the public key certificate from Keycloak to verify the JWT token signature. — certs_url = f"{self.keycloak_url}/realms/{self.realm}/protocol/openid-connect/certs". Tension: Decode and verify the JWT token signature using the public key, while skipping audience and issuer checks. Outcome: jwt.decode( token, public_key, algorithms=['RS256'], options={ 'verify_aud': False, 'verify_iss': False } ).

MATCHESSolution

You could remove `dependencies=[Depends(JWTBearer())]` — as you are storing your token in cookies. Tension: that should work fine. Outcome: and that should work fine.

MATCHESSolution

Enable JWT-based sessions (`session.strategy = 'jwt'`) and add `callbacks.jwt` to save `account.access_token` onto the JWT, plus `callbacks.session` to copy that value into `session.accessToken`. Update TypeScript types (e.g., `types/next-auth.d`) so `session.accessToken` is available.

MATCHESSolution

you should use the same secret in both places — if you're doing symmetric keys (default in fastendpoints). Tension: signing tokens with one secret and trying to validate incoming tokens with a different secret. Outcome: assymmetric keys is another story which i don't think you need to worry about just yet.

MATCHESSolution

Ideally, use a standard protocol like OAuth 2.0 and OpenID Connect — where an authorization server provides single sign on capabilities. Tension: to enable the above.

MATCHESSolution

the information about the user is inside the JWT — other services does not need to call the authorization service or database. Tension: this token is signed from the authorization service but other services does not need to call the authorization service or database. Outcome: they only need a shared secret they use to check the validity of the token.

MATCHESSolution

Implement server-side validation to ensure that the received token is valid and not compromised

MATCHESSolution

Setting the expiration of the JWT token for me only works when I add it during JWT-callback — Regenerating a new JWT token can be achieved with setting `refetchInterval` of `SessionProvider`. Outcome: token.exp = Math.round(Date.now() / 1000) + JWT_TOKEN_EXPIRES_IN_SECONDS.

MATCHESSolution

Perform the authorization-code-to-token exchange in the backend to keep tokens and the client secret off the client. Create/establish an app-specific user session (e.g., HTTP session cookies or tokens) and do not use the external provider access token directly for your backend authorization; generate/validate authorization specific to your APIs.

MATCHESSolution

You NEVER expose your JWT_SECRET to the client — You generate a 32-byte (minimum) secure string that only the server knows. Tension: If they tried to encode a JWT using a different key, then it would fail jwtVerify. Outcome: a user cannot forge a token because they don't know the key.

MATCHESSolution

Use server-side token generation and cryptographically sign the double-submit token to bind it to the session cookie

MATCHESSolution

Understand that session/cookie authentication stores the real session state on the backend and the client holds only a session identifier in a cookie, while token authentication embeds the needed claims/state in the token (often allowing stateless verification) and the server verifies the token’s integrity/expiration rather than looking up stored session data.

MATCHESSolution

First thing's first: HTTPS. — if JWT is a POST parameter or a bearer token under HTTPS. Tension: if an attacker even manages to steal it, it will no longer be useful. Outcome: you could make it a one-timed token.

MATCHESSolution

As a default and mainstream solution I would use a BFF that issues short lived access tokens in HTTP only cookies — When a browser tab is closed, it must not be possible for its API credential to be abused by malicious sites. Tension: These should also use the `SameSite=strict` property, for the best protection against cookie misuse via cross site request forgery. Outcome: These should also use the `SameSite=strict` property.

MATCHESSolution

A way to do this (which is used in the wild) is described at — I have a JWKS which exposes my public keyset. Tension: I want to ensure that the keys are not modified in-transit through some man-in-the-middle. Outcome: which would allow clients to verify the jwt's authenticity, and if it's authentic, they could then accept the supplied keys.

MATCHESSolution

by supplying the certificate chain as is described in the JWKS spec. Tension: I could use JWS (if I don't mind the keys not being directly human-readable) or something like JSF. Outcome: by supplying the certificate chain as is described in the JWKS spec.

MATCHESSolution

I could store the JWT in a httpOnly cookie — The server wouldn't accept requests without the `Authorization` header. Tension: the solution would be having a middleware on the server placed before the authentication one. Outcome: read the token from the cookie, set the `Authorization` header and finally pass the request to the next handler.

MATCHESSolution

The most correct OAuth way to design this is to use scopes and claims. — access tokens and the user identity to flow between microservices. Tension: without security concerns. Outcome: The APIs also check for required scopes.

MATCHESSolution

Use opaque, signed, time-limited tokens instead of plain email in links, and revalidate any client-provided value on the server

MATCHESSolution

the JWT token should be evaluated in the resource server — whatever system that relies on a JWT token validates it properly. Tension: the signature and relevant claims like the `aud` claim etc. Outcome: the JWT token should be evaluated in the resource server.

MATCHESSolution

JWT implementations hash the header.payload bytes with SHA-256 to produce a fixed-length digest, then sign that digest; this keeps signatures smaller and makes signing/verifying efficient while preserving integrity.

MATCHESSolution

"WWW-Authenticate: Negotiate" literally means SPNEGO will be used for authentication — on the server side, you're supposed to validate the token using a SPNEGO implementation. Tension: If the client starts by sending an NTLM token instead of Kerberos, that is not because of a missing header. Outcome: you haven't registered a SPN for the server within Active Directory.

MATCHESSolution

Your hardware token idea is the only thing you've listed that is plausible — assuming the token's hardware has its own clock and is hardened against tampering. Tension: There is no way to trust hardware that someone else controls. Outcome: This is just a computer that you trust because the user does not control it.

MATCHESSolution

I guess I'm looking for a kind a JWT associated to the ID without expiration but maybe there is better solution. — Generate unpredictable/unforgeable URL from predictable ID. Outcome: I think your idea of using a JWT makes the most sense.

MATCHESSolution

another solution that is to implement a service that query data from workspace-service and use it to validate — I want to implement authorization logic that check if a user has access to a particular cloud instance. Tension: the drawback of this solution. Outcome: I would use 2nd solution with longer token lifespan to not generate it so often.

MATCHESSolution

Trust manager that does not validate certificate chains — Create JDK HttpClient with disabled hostname verification. Tension: Need hand on more with these code snippets for checking. Outcome: sslContext.init(null, trustAllCerts, new java.security.SecureRandom());.

MATCHESSolution

Store both token types in the OAuth2AuthorizationService so revoke/introspect can work for access tokens as well as refresh tokens; if you want to avoid per-request introspection, configure clients to trust JWTs without calling introspection unless they need to confirm revocation.

MATCHESSolution

Solution: — leveraging Spring Security for Authentication. Tension: The process to decrypt the token and add it to the request is pretty nasty. Outcome: I worked around the issue and got it working.

MATCHESSolution

I'm verifying the user OTP to change password — after change password. Tension: unable to create access and refresh token using JWT.

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