timothyandClaude Opus 4.8 cf834d8b60
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security(#283): sniff artwork content type from bytes, remove serve-side ?contentType= reflection
S4 stored-XSS + S9 upload-size DoS from the #197 cold API review.

The artwork path trusted client-supplied content types at both ends: upload
validated only the declared multipart Content-Type (never decoded the bytes),
and serving reflected a client `?contentType=` straight into the response
Content-Type on unauthenticated GET sinks (/iptv/logos, /artwork/watermarks).
Chain: upload <script> bytes as image/png -> GET ...?contentType=text/html
serves them as HTML in-origin. nosniff (#279) does not help because the server
explicitly declares text/html.

- Upload: derive the content type from the bytes via SkiaSharp SKCodec
  (header-only, no decode -> no decompression-bomb path); reject non-images 422.
  New ErsatzTV.Core/Images/ImageContentTypes as the single allow-list source.
  Dropped the untrusted declared Content-Type from the UploadArtwork command.
- Serve: removed the ?contentType= reflection structurally -- dropped ContentType
  from GetCachedImagePath and the [FromQuery] binding on GetImage/GetWatermark;
  the handler always sniffs the file, defaulting application/octet-stream.
  ArtworkContentTypeModel.UrlWithContentType is now the bare path; SPA previews
  no longer append the query.
- Defense-in-depth: channel-logo / watermark {path, contentType} DTOs run through
  ArtworkContentTypeModel.Sanitized(), blanking non-allow-listed types on write.
- S9: Kestrel MaxRequestBodySize from ETV_MAXIMUM_UPLOAD_MB rejects oversized
  bodies during read (controller file.Length check kept as friendly-error backstop).

Both serve sinks are IgnoreApi, so no OpenAPI change. Tests: byte-sniff accept/
reject, Sanitized() allow-list, Location no longer carries ?contentType=.
Docs: api-conventions §4a + decisions.md 2026-07-12.

Refs #283 #197 #66

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-12 00:07:55 +02:00
2025-11-26 10:49:01 -06:00
2022-04-28 06:56:01 -05:00
2025-11-11 06:12:46 -06:00
2021-02-08 21:13:53 -06:00
2026-07-02 19:24:06 +02:00
2023-08-13 09:33:33 -05:00
2025-11-26 10:49:01 -06:00
2026-02-24 15:27:51 -06:00

ErsatzTV

ErsatzTV lets you transform your media library into a personalized, live TV experience - complete with EPG, channel scheduling, and seamless streaming to all your devices. Rediscover your content, your way.

contact features community

epg-example

How It Works

  1. Install ErsatzTV: Download and set up the server on your system.
  2. Add Your Media: Connect your media libraries and collections.
  3. Create Channels: Design and schedule your own live channels.
  4. Stream Anywhere: Watch on any device with IPTV and EPG support.

Key Features

  • Custom channels: Create and schedule your own live TV channels.
  • IPTV & EPG: Stream with IPTV and Electronic Program Guide support.
  • Hardware Transcoding: High-performance streaming with hardware acceleration (NVENC, QSV, VAAPI, AMF, VideoToolbox)
  • Media Server Integration: Connect Plex, Jellyfin, Emby and more.
  • Music & Subtitles: Mix music videos and enjoy subtitle support.
  • Open Source: Free, open, and community-driven project.

Documentation

Documentation is available at ersatztv.org.

License

This project is inspired by pseudotv-plex and the dizquetv fork and is released under the zlib license.

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Fork of ErsatzTV - custom IPTV channel server (upstream archived Feb 2026)
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