Re: Problems with ServerCertificateValidationCallback

Does ValidateServerCertificate get called when the callback fails?

John Warner


> -----Original Message-----
> From: Discussion of advanced .NET topics. [mailto:ADVANCED-
> [email protected]] On Behalf Of Dean Cleaver
> Sent: Sunday, November 22, 2009 4:47 PM
> To: [email protected]
> Subject: [ADVANCED-DOTNET] Problems with
> ServerCertificateValidationCallback
> 
> I'm using the below code (trimmed a bit of unimportant stuff out) to
check a
> given page on a site, and validate the server certificates. However, it
seems to
> not call the callback at all for some sites, despite the url being
https, and
> manual checking of the site indicates a valid certificate.
> 
> I'm using an instance level function and a mutex so I can ensure that
I'm
> checking one at a time. I've even stepped through the code, and the
callback
> just doesn't get called for some sites.
> 
> Any ideas why?
> 
> Dino
> 
> 
>         private bool checkedCertificate;
>         public void RunTest(object url)
>         {
>             Mutex mutex = new Mutex(false, "WebsiteLock");
>             mutex.WaitOne();
> 
>             try
>             {
>                 HttpWebRequest httpWebRequest = (HttpWebRequest)
> WebRequest.Create(url.ToString());
>                 ServicePointManager.ServerCertificateValidationCallback
=
> this.ValidateServerCertificate;
> 
>                 checkedCertificate = false;
> 
>                 HttpWebResponse httpWebResponse = (HttpWebResponse)
> httpWebRequest.GetResponse();
>             }
>             finally
>             {
>                 mutex.ReleaseMutex();
>             }
>         }
> 
>         public bool ValidateServerCertificate(
>               object sender,
>               X509Certificate certificate,
>               X509Chain chain,
>               SslPolicyErrors sslPolicyErrors)
>         {
>             checkedCertificate = true;
> 
>             // Allow this client to communicate with unauthenticated
servers
>             return true;
>         }
>     }
> }
> 
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