子资源完整性保护在 Chrome 中不起作用

Question

我根据 Subresource Integrity 在我的脚本中添加了 integrity 和 crossorigin 标签，但现在他们在控制台中给出了一个错误

Script from origin 'http://pagead2.googlesyndication.com' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:81' is therefore not allowed access.

这是脚本：

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" 
  integrity="sha256-5xwrIw3xU3VvipjVMZNyf6+27C/a1Pxl3U0jl3hTcao=" 
  crossorigin="anonymous"></script> <!-- Banner --> <ins class="adsbygoogle" style="display:inline-block;width:728px;height:90px" data-ad-client="ca-pub-3346556035533863" data-ad-slot="8052306231"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script>

这是推导：

$ curl -s http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js | openssl dgst -sha256 -binary | openssl base64 -A
5xwrIw3xU3VvipjVMZNyf6+27C/a1Pxl3U0jl3hTcao=

我还向 Amazon 脚本添加了属性，但也失败了。

Script from origin 'http://s3.amazonaws.com' has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:81' is therefore not allowed access.

<script async="async" type="text/javascript" src="//s3.amazonaws.com/cc.silktide.com/cookieconsent.latest.min.js" 
integrity="sha256-/8egBZx4+UIzXH8il2CNdL5+npDYgoAsjC76KHO/re4=" crossorigin="anonymous"></script>

Chrome 支持 SRI：http://enable-cors.org/client.html, https://www.chromestatus.com/feature/6183089948590080

我使用规范中的示例验证了哈希是否正确生成：http://www.w3.org/TR/SRI/#integrity-metadata

为什么它不起作用？它在没有两个新属性的情况下工作。

参考：https://www.srihash.org/

Chrome版本 46.0.2490.86m

Answer 1

我认为是因为服务器没有明确允许CORS，所以Chrome阻止了它。 Silktide cookie 脚本已移至 Cloudflare，它确实具有 Access-Control-Allow-Origin，因此现在可以使用了。我不知道为什么浏览器会关心服务器是否允许 cross-origin 脚本。似乎只要哈希匹配，它来自哪里并不重要。

<script async="async" type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/1.0.9/cookieconsent.min.js" 
integrity="sha256-GQ/ALY6PHdWsxA9I0NYgPmEV6zHj9H9V2ww/B3l9aPA=" crossorigin="anonymous"></script>

服务器headers:

$ curl -I http://cdnjs.cloudflare.com/ajax/libs/cookieconsent2/1.0.9/cookieconsent.min.js
HTTP/1.1 200 OK
Date: Tue, 24 Nov 2015 19:37:10 GMT
Content-Type: application/javascript
Connection: keep-alive
Last-Modified: Mon, 19 Oct 2015 15:05:30 GMT
Expires: Sun, 13 Nov 2016 19:37:10 GMT
Cache-Control: public, max-age=30672000
Access-Control-Allow-Origin: *
CF-Cache-Status: HIT
Server: cloudflare-nginx
CF-RAY: 24a791216c9b03f4-EWR

子资源完整性保护在 Chrome 中不起作用

Subresource Integrity Protection doesn't work in Chrome

javascript

security

google-chrome

subresource-integrity