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Piotr Mlocek
94f0b27c75
Follow-up hardening on the alpha extension authentication mechanism. Claim contract: - Extension tokens carry an explicit `typ` of `openshell-ext+jwt`. They share a signing key with sandbox-to-gateway admission tokens and were otherwise separated by audience alone, so a verifier that neglects to check `aud` could accept a gateway credential. The header is a second, independent discriminator. - Publish OIDC-shaped discovery at `/.well-known/openid-configuration` so a service configured with only the gateway URL can learn the exact expected issuer and the JWKS location. It is shaped, not compliant: `issuer` is the gateway identity, not the serving URL. Audience agreement: - `MiddlewareManifest` and `InterceptorManifest` gain `expected_audience`. The audience is otherwise configured independently on each side of the boundary, where a mismatch surfaces only as an opaque authentication failure on every call. OpenShell now compares the two and fails at startup. An empty field keeps the check off for existing services. Compatibility: - Add `allow_insecure_transport` per registration. Enabling gateway JWT signing previously made any plaintext endpoint a hard startup failure, including the endpoint form used in our own documentation. The opt-out attaches no credential, is refused by the gateway if a supervisor asks for one, and warns at every startup. - Make the transport requirement kind-aware. A middleware endpoint must be reachable from every sandbox supervisor, so only interceptors may use a gateway-local Unix socket. Credential lifecycle: - Replace the process-global slot map with a supervisor-owned `ExtensionCredentialStore` shared explicitly across the gateway connections the supervisor opens, removing test-order coupling. - Rotate only when a credential is missing or has passed four fifths of its lifetime. Configuration polling ran every ten seconds against fifteen-minute credentials, so each poll re-ran gateway effective-policy resolution and re-minted the gateway token. - Bound credential minting per sandbox, since each request resolves the caller's effective policy. Signed-off-by: Piotr Mlocek <pmlocek@nvidia.com>