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Donkie
c33f65243c
Closes the two confirmed CSRF findings and the cross-site websocket hijack
from the backend security audit (todo.md tasks 1 and 3).
POST /setting/{key} took a bare `str` body, and FastAPI only JSON-parses
application/*json -- anything else arrived as raw bytes that lax-mode Pydantic
coerced. A text/plain body was therefore accepted, which is exactly what
<form enctype="text/plain"> sends, so any website the user visited could
rewrite base_url, label_designs, locations or extra_fields_* through their
browser. Now requires a JSON content type.
The audit suggested Body(media_type="application/json") for this, but that only
annotates the OpenAPI schema and is not enforced at runtime -- a text/plain post
to a pinned endpoint still returns 200. Hence an explicit dependency. Both
clients already send application/json, and a charset parameter is accepted, so
this is wire-compatible.
TrustedOriginMiddleware refuses state-changing HTTP methods and every websocket
handshake from an untrusted origin, using the helper added in the previous
commit. A middleware rather than per-endpoint dependencies so that none of the
nine websocket endpoints can be missed, and one added later cannot forget to
opt in. Reads are left alone -- the same-origin policy already covers them --
but every websocket is guarded, since websockets are exempt from CORS and
otherwise leak the whole inventory to any origin that opens one.
It is ordered inside the CORS middleware so a legitimate cross-origin client
can read the 403 body instead of an opaque CORS error.
Writing a malformed extra_fields_* array through the settings endpoint bypassed
validate_extra_field and left GET /field/{entity} permanently returning 500;
that array is now validated, and the registry cache is invalidated on write so
the /setting and /field paths no longer disagree until restart.
Verified against a real uvicorn server by replaying the audit's exploit: the
text/plain write is refused, a bodyless form post that would have reset a
setting is refused, a websocket from a foreign origin gets HTTP 403 on the
handshake, and clients that send no Origin at all -- Moonraker, OctoPrint,
Home Assistant, curl -- are unaffected on both HTTP and websockets.