[Webkit-unassigned] [Bug 225865] New: CSP sandbox policy header disables built-in media player

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225865

            Bug ID: 225865
           Summary: CSP sandbox policy header disables built-in media
                    player
           Product: WebKit
           Version: Safari 14
          Hardware: Other
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fnowak at atlassian.com

We have encountered problems with introducing "Content-Security-Policy: sandbox" header to some resources.
The issue is described here: https://jira.atlassian.com/browse/JRASERVER-72275.

Steps to reproduce:
1. Request for audio/video file and get a response with "Content-Security-Policy: sandbox" HTTP header set.

Actual results:
1. Console shows: "Blocked script execution in 'http://localhost:8080/secure/attachment/10000/100MBVideo.mp4' because the document's frame is sandboxed and the 'allow-scripts' permission is not set."
2. The video does not play.

Expected results:
1. Video plays without issues.

Workaround:
1. Set "Content-Security-Policy: sandbox allow-scripts" header for affected browsers.


The same issue occurs both in OS X and iOS versions of Safari, as well as iOS version of Chrome, thus we think that the problem lies within WebKit itself.
Firefox on OS X works without any issues. However, Chrome for OS X requires `allow-same-origin` instead of `allow-scripts` to function properly.

Could you please confirm if this is a bug or desired behaviour?

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