Retrieving REST Data Using NTLM From a Dual Auth Site in SharePoint 2010


The title of this post actually makes this sound a lot more complicated than the final solution.  It's really a case of combining the techniques I discussed in two previous posts:  http://blogs.technet.com/b/speschka/archive/2010/09/25/retrieving-rest-data-in-a-claims-based-auth-site-in-sharepoint-2010.aspx and http://blogs.technet.com/b/speschka/archive/2011/04/01/retrieving-data-from-a-multi-auth-site-using-the-client-om-and-web-services-in-sharepoint-2010.aspx.  The short version of the scenario is this – some folks wanted to do a something like a health check ping against a SharePoint site that used SAML authentication.  Previously they had only been working against sites that used on Windows authentication, and as soon as they tried those tools against a site that supported multiple authentication types – SAML and Windows – those tools stopped working.

The point of the health check is just to make a request to a site and make sure that data is returned; if some error code is returned instead then they can start digging into it.  I decided the easiest way to do this was just to make a call to the listdata.svc that is the REST endpoint for the site.  It is something that will always be there, and configuring it to force it into using NTLM in a multi-auth site is something that I figured would be pretty easy, and in fact it was.  The gist of the approach is just to make an HttpWebRequest and add the header I described in the second link above to force it use NTLM.  The result is a fairly straightforward looking chunk of code that looks like this:

string endpoint = UrlTxt.Text + "/_vti_bin/listdata.svc";
    
//make a request to the REST interface for the data
HttpWebRequest webRqst = (HttpWebRequest)WebRequest.Create(endpoint);
webRqst.UseDefaultCredentials = true;
webRqst.Method = "GET";
webRqst.Accept = "*/*";
webRqst.KeepAlive = true;
webRqst.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");

//read the response now
HttpWebResponse webResp = webRqst.GetResponse() as HttpWebResponse;

//make the request and get the response
StreamReader theData = new StreamReader(webResp.GetResponseStream(), true);
string payload = theData.ReadToEnd();
theData.Close();
webResp.Close();

ResultsTxt.Text = payload;

So as you can see, I just create the request, set a few properties and then add my header that tells SharePoint to use Windows auth.  Then I just make my request and I'm good to go.  It's a pretty simple project, but I've attached the complete solution to this posting in case it's helpful.

 

ClaimsREST.zip

Comments (5)

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  2. AM says:

    Hi Steve,

    Great post.  I have a question that may or may not be related.  I've been working to create a Custom Claims Provider for SP2010.  I am authenticating to ADFSv2 to get a SAML token with some claims, and I want a custom claims provider (farm feature in SP2010) to then augment those claims.  However, I want it to access content from a SharePoint list (within the custom claims provider) to use in augmenting the user's claims.  But, in the custom claims provider the SPContext.Current object is always NULL… so I can't get a Web and can't get the pre-defined list.

    So, I'm wondering am I doing something wrong in trying to use the SPContext.Current object for this, or is using REST as you've defined here the only way to access SharePoint list content from within a Custom Claims Provider?

    Thanks,

    A

  3. Rick says:

    After 4 days of fighting with dual- auth and getting 403 Forbidden errors, when trying to access the Excel REST services, you finally saved me!! That one line of code is magical. THANKS!

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