[Webkit-unassigned] [Bug 70463] New: CSP blocks src-less plugins when enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70463

           Summary: CSP blocks src-less plugins when enabled
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://davidben.net/csp-test.html
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: davidben at mit.edu


Having a Content-Security-Policy enabled blocks <embed> tags without a src attribute. I've put together a quick test case at

http://davidben.net/csp-test.html

It sends "default-src 'self'" on both X-WebKit-CSP and X-Content-Security-Policy. The contents are a Flash applet with no src and an image from another site just to make sure CSP is working at all. In the latest Chromium nightly, both are blocked and I get

  Refused to load object from '' because of Content-Security-Policy.

in the console. In Firefox only the image is blocked, and I get an (uninteresting) Flash applet. But Flash does still load. I think it makes more sense for CSP not to trigger here since nothing from another origin is actually being loaded (and this block can be circumvented by putting in a dummy src from the same origin anyway). This is particularly relevant if I want to turn on CSP for a Chrome extension that embeds an NPAPI plugin into the background page; they're often src-less, including in the example.

http://code.google.com/chrome/extensions/npapi.html

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