How to retrieve List item and display using CSOM from different domain?

Question

We have different domain xyz.com and we can browse the contents of xyz.com sharepoint site using ADFS of abc.com using Single sign-on.

The Problem is how to get access the sharepoint list in xyz.com when we have only abc.com access?.

How to retrieve the list item in xyz.com using this CSOM based model with above said abc.com user?

Answer 1

You can create a new CSOM context by providing credentials:

var clientContext = new ClientContext(SITE_URL);
clientContext.AuthenticationMode = ClientAuthenticationMode.Default; 
clientContext.Credentials = new DefaultNetworkCredential(USER, 
PASSWORD.GetSecureString()); 
Web web = context.Web; context.Load(web); 
context.ExecuteQuery(); 
Console.WriteLine("Connected to " + web.Title + " site");

I'm not sure if there are any other good options in case of SP2010

Answer 2

I'm assuming you're writing web parts deployed to the abc.com farm. If so, you're probably experiencing a classic double-hop issue. The code on abc does not access xyz using the current abc user's login, it does so using the app pool identity of the abc web application.

If you have very basic security requirement, you can add grant that identity access to xyz and you might get some data. If you need to maintain the abc user's security context, you're going to have to implement some sort of pass-through mechanism like Kerberos. Good luck!

https://blogs.msdn.microsoft.com/besidethepoint/2010/05/08/double-hop-authentication-why-ntlm-fails-and-kerberos-works