State.RenameUser went through UpdateUser and skipped the checks
db.RenameUser applies, so the API could rename an OIDC user, whose
name the identity provider owns, or rename any user to an invalid
name. Apply both checks in the update function and map the username
validation errors to 400.
The rest arrives with the first MapRequest. A relogin keeps the node's
current Hostinfo, endpoints and disco key; an oversized merge is a 400.
Fixes ANT-2026-RQS7JAPP
handleRegister, the OIDC auth path and SetNodeExpiry refuse it. Expiries
are stored in UTC, which SQLite can read back, and loaded in UTC, as
PostgreSQL returns the server's zone. The v1 API answers 400.
Fixes ANT-2026-QMCAFJ1Q
Reimplement the v1 API as a code-first Huma service in hscontrol/api/v1,
a thin adapter over the state layer. Huma emits the OpenAPI 3.1 document
(openapi/v1/headscale.yaml) from the Go operation and type definitions;
cmd/gen-openapi writes it and the 3.0.3 downgrade the client is generated
from. Responses reproduce the protojson wire contract (string-encoded
64-bit IDs, all fields emitted, RFC3339/null timestamps); errors map to
the correct HTTP status (404/400/409, 500 for server faults) via mapError.
Serve it on the chi router at /api/v1 behind the existing API-key
middleware, and point /swagger at the emitted spec.
Michael Lopez
Kristoffer Dalby