[Webkit-unassigned] [Bug 148363] New: Implement Subresource Integrity (SRI)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148363

            Bug ID: 148363
           Summary: Implement Subresource Integrity (SRI)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
               URL: https://w3c.github.io/webappsec/specs/subresourceinteg
                    rity/
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mike at w3.org

The SRI specification "defines a mechanism by which user agents may verify that a fetched resource has been delivered without unexpected manipulation" using a validation scheme and "extending several HTML elements with an integrity attribute that contains a cryptographic hash of the representation of the resource the author expects to load." http://w3c.github.io/webappsec/specs/subresourceintegrity/

Example: If a document loads some JavaScript library code from a shared server at https://example.com/example-framework.js rather than from the same own origin as the document, the document can specify the expected SHA-256 hash of https://example.com/example-framework.js (e.g., C6CB9UYIS9UJeqinPHWTHVqh/E1uhG5Twh+Y5qFQmYg=) and the UA, before executing the JavaScript, can verify that the data matches that expected hash.

<script src="https://example.com/example-framework.js"
        integrity="sha256-C6CB9UYIS9UJeqinPHWTHVqh/E1uhG5Twh+Y5qFQmYg="
        crossorigin="anonymous"></script>

The mechanism can also be used for resources loaded through <link> elements.

As far as support in other UAs, Chrome has supported Subresource Integrity since v45, and Firefox has since v43. https://developer.mozilla.org/en/docs/Web/HTML/Element/script#Browser_compatibility

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