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c#silverlightsilverlight-5.0

Silverlight 5 with elevated privileges in browser using clientaccesspolicy.xml

I am trying to get my silverlight application running with elevated privileges in browser. However, no matter what I do, it doesnt get elevated.

I have tried to add registry key AllowElevatedTrustAppsInBrowser (as DWORD with value 1), and signed the XAP file using VS 2012. I also came across a blog that mentioned the clientaccesspolicy.xml file, but I was not able to allow elevated privileges with this either. I put the xml file inside the web project hosting the html file that displays the XAP.

Has anyone actually managed to get this to run?

I also tried following this: http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2011/04/27/silverlight-5-beta-rough-notes-trusted-apps-in-the-browser.aspx but im unsure about where to run the commands he runs on windows.

Solution

  • There is a good summary on how to enable in-browser elevated trust by Mister Goodcat here, where he also provides some troubleshooting tips:

    • One thing to keep in mind is that even if your application runs as trusted in-browser app, it is still subject to the security restrictions the browser itself imposes. That means that its possibilities may be much more restricted than if they ran out of browser, for example by Internet Explorer's Protected Mode. In addition, the Silverlight runtime itself restricts use of certain features for in-browser trusted apps, for example you cannot use the Window class and/or create additional windows when you're running in the browser.

    • If none of the above applies to you and you still run into problems, one thing to do is check whether your certificate(s) have been installed correctly. There's a snap-in for the management console for this. Here is an article that describes how to get there (note that you should add a snap-in for your user account, not the computer account as in this description).

    • You can also check whether your registry key is actually and successfully queried, for example by using a tool like Process Monitor from the Sysinternals Suite. Watch for operations of type "ReqQueryValue" of your browser executable that access the key we created above, and make sure the Result is "SUCCESS".