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added "media-src: 'self'" to CSP for resources (#3578)

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Synapse doesn’t allow for media resources to be played directly from
Chrome. It is a problem for users on other networks (e.g. IRC)
communicating with Matrix users through a gateway. The gateway sends
them the raw URL for the resource when a Matrix user uploads a video
and the video cannot be played directly in Chrome using that URL.

Chrome argues it is not authorized to play the video because of the
Content Security Policy. Chrome checks for the "media-src" policy which
is missing, and defauts to the "default-src" policy which is "none".

As Synapse already sends "object-src: 'self'" I thought it wouldn’t be
a problem to add "media-src: 'self'" to the CSP to fix this problem.
This commit is contained in:
Jérémy Farnaud 2018-09-25 12:55:02 +02:00 committed by Richard van der Hoff
parent 94f7befc31
commit 6cf261930a
2 changed files with 2 additions and 0 deletions
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1
changelog.d/3578.bugfix Normal file
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@ -0,0 +1 @@
Fix problem when playing media from Chrome using direct URL (thanks @remjey!)

1
synapse/rest/media/v1/download_resource.py
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@ -52,6 +52,7 @@ class DownloadResource(Resource):
b" script-src 'none';"
b" plugin-types application/pdf;"
b" style-src 'unsafe-inline';"
b" media-src 'self';"
b" object-src 'self';"
)
server_name, media_id, name = parse_media_id(request)