Merge upstream/main into fix/taiwan-highway-cctv-fallback

SECURITY.md

@@ -69,7 +69,7 @@ browser-key fallback for existing single-key setups.
 The data proxies under `server/providers/` are written so the browser cannot turn the server into an open relay:
 
 - **No arbitrary-URL fetching.** The CCTV frame proxy fetches only server-registered camera/frame URLs — clients cannot pass an upstream URL to fetch (SSRF mitigation). Other proxies target fixed upstream hosts.
-- **Live HLS is bounded and origin-pinned.** Registered HTTP(S) HLS sources use a Node puller that rejects redirects and off-origin playlist references, bounds playlists and segment bodies while streaming, and aborts timed-out or released sessions. At most two sessions retain 12 segments/24 MiB each, plus bounded download buffers. Stores are memory-only and idle sessions expire after 15 seconds. RTMP/ffmpeg execution is not enabled. Locally configured source URLs remain an operator trust boundary.
+- **Live HLS is bounded and origin-pinned.** Registered HTTP(S) HLS sources use a Node puller that rejects redirects and off-origin playlist references, bounds playlists to 256 KiB and segment bodies to 8 MiB while streaming, and aborts timed-out or released sessions. At most two sessions retain 12 segments/24 MiB each, plus bounded download buffers. Stores are memory-only and idle sessions expire after 15 seconds. RTMP/ffmpeg execution is not enabled. Locally configured source URLs remain an operator trust boundary.
 - **Radio is not an audio relay.** `/api/radio/stations` contacts only allowlisted Radio Browser HTTPS hosts and paths, rejects redirects, rejects any hostname with a loopback/private/link-local/metadata/non-public A or AAAA result, and pins each TLS connection to a validated address. It returns normalized public HTTPS stream URLs; `/api/radio/click/:uuid` applies the same destination policy and accepts only station IDs from the current bounded catalog. The browser then connects directly to the broadcaster after an explicit playback action, so the broadcaster sees the listener's IP address. GEV never proxies, caches, records, or redistributes audio.
 - **Québec 511 video plays in the browser, opt-in and after Play.** With `CCTV_QUEBEC_VIDEO_ENABLED=1`, `/api/cctv/sources` lists, for each MTQ camera, one URL built server-side from its numeric id on `https://www.quebec511.info/Carte/Fenetres/camera.ashx`; the overlay accepts no other host, path or format. The browser loads that clip only after the viewer presses Play for the selected camera, so Québec 511 sees the viewer's IP address, and the panel says so before Play. Selecting a camera by click, auto-hop, a scene or voice never loads it, and switching cameras stops playback. GEV never proxies, caches or reads the video's pixels. With the flag unset (the default) the browser makes no request to Québec 511.
 - **No verbatim client headers upstream.** The CCTV media route is the one route that relays a request header (`Range`, for video seeking). It is parsed and canonicalized before it is forwarded: one `bytes=` range only, with every accepted form — explicit span, open-ended and suffix — bounded to the same 64 MiB ceiling the relay applies to a declared response body. Multi-range, malformed, inverted and non-`bytes` values are dropped and the request proceeds without a `Range`, as RFC 7233 §3.1 prescribes. Bounding the request bounds what is asked for: a response that declares no length — live streamed media, or a chunked body from an upstream that ignores the `Range` — has no ceiling. An upstream request the browser has stopped waiting for is cancelled rather than left running, whether the viewer leaves before the headers arrive or during the body.