Reject cross-origin websocket connections (#24714)

* reject cross-origin websocket handshakes

Neither /ws nor the jsmpeg websockets checked Origin, and the internal port grants admin to everyone, so any page a LAN user visited could open ws://frigate:5000/ws and send commands or read streams. Both servers now reject a browser handshake whose Origin host matches neither Host nor X-Forwarded-Host, and allow handshakes without an Origin for non-browser clients. nginx now forwards an outer proxy's X-Forwarded-Host instead of overwriting it, so proxies that rewrite Host and the Home Assistant integration's proxy still match.

* apply runtime role changes to jsmpeg streams

The output process never subscribed to config/auth, so role edits from the Roles UI (requires_restart 0) did not reach it and jsmpeg kept streaming cameras that had been removed from a role until restart. The output process now replaces its auth config on config/auth updates, which the camera and birdseye broadcast threads read through the shared config.

* tidy origin check docstring and auth update comment

* reject cross-origin go2rtc stream requests in /auth

The go2rtc websockets and the webrtc offer POST still accepted any Origin, since go2rtc runs with origin "*" and /auth grants admin on the internal port, so a page on another site could pull live video through a LAN user's browser. nginx now passes Origin, Host, X-Forwarded-Host and Upgrade to /auth, which rejects a websocket upgrade or go2rtc stream request with a foreign Origin before the internal-port early return. The hostname rule moves to frigate/util/origin.py so /auth and the ws4py servers share it.

* set Host in the nginx proxy doc examples

* drain all queued auth updates in the output process

* note that cards must stream through the integration proxy

* strip the query before matching go2rtc paths in the origin check

frigate/comms/ws.py

@@ -40,6 +40,7 @@ from frigate.const import (
 )
 from frigate.models import User
 from frigate.output.ws_auth import ws_has_camera_access
+from frigate.util.origin import origin_allowed
 
 logger = logging.getLogger(__name__)
 
@@ -472,6 +473,28 @@ def _materialize_for_ws(
     return None
 
 
+class OriginCheckedWebSocketApplication(WebSocketWSGIApplication):  # type: ignore[misc]
+    """ws4py application that rejects cross-origin browser handshakes."""
+
+    def __call__(self, environ: dict[str, Any], start_response: Callable) -> Any:
+        if not origin_allowed(
+            environ.get("HTTP_ORIGIN"),
+            environ.get("HTTP_HOST"),
+            environ.get("HTTP_X_FORWARDED_HOST"),
+        ):
+            logger.warning(
+                "Rejected cross-origin websocket handshake: origin=%s, host=%s, "
+                "x-forwarded-host=%s",
+                environ.get("HTTP_ORIGIN"),
+                environ.get("HTTP_HOST"),
+                environ.get("HTTP_X_FORWARDED_HOST"),
+            )
+            start_response("403 Forbidden", [("Content-Length", "0")])
+            return []
+
+        return super().__call__(environ, start_response)
+
+
 class WebSocket(WebSocket_):  # type: ignore[misc]
     def __init__(self, *args: Any, **kwargs: Any) -> None:
         super().__init__(*args, **kwargs)
@@ -621,7 +644,7 @@ class WebSocketClient(Communicator):
             5002,
             server_class=WSGIServer,
             handler_class=WebSocketWSGIRequestHandler,
-            app=WebSocketWSGIApplication(handler_cls=_WebSocketHandler),
+            app=OriginCheckedWebSocketApplication(handler_cls=_WebSocketHandler),
         )
         self.websocket_server.initialize_websockets_manager()
         self.websocket_thread = threading.Thread(