NegotiationInfoClass.cs

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using System.Runtime.InteropServices;
 
namespace System.Net;
 
internal static class NegotiationInfoClass
{
    internal unsafe static string GetAuthenticationPackageName(SafeHandle safeHandle, int negotiationState)
    {
        if (safeHandle.IsInvalid)
        {
            if (System.Net.NetEventSource.Log.IsEnabled())
            {
                System.Net.NetEventSource.Info(null, $"Invalid handle:{safeHandle}", "GetAuthenticationPackageName");
            }
            return null;
        }
        bool success = false;
        try
        {
            safeHandle.DangerousAddRef(ref success);
            IntPtr intPtr = safeHandle.DangerousGetHandle();
            if (System.Net.NetEventSource.Log.IsEnabled())
            {
                System.Net.NetEventSource.Info(null, $"packageInfo:{intPtr} negotiationState:{negotiationState:x}", "GetAuthenticationPackageName");
            }
            if (negotiationState == 0 || negotiationState == 1)
            {
                string text = Marshal.PtrToStringUni(((SecurityPackageInfo*)(void*)intPtr)->Name);
                if (System.Net.NetEventSource.Log.IsEnabled())
                {
                    System.Net.NetEventSource.Info(null, $"packageInfo:{intPtr} negotiationState:{negotiationState:x} name:{text}", "GetAuthenticationPackageName");
                }
                return string.Equals(text, "Kerberos", StringComparison.OrdinalIgnoreCase) ? "Kerberos" : (string.Equals(text, "NTLM", StringComparison.OrdinalIgnoreCase) ? "NTLM" : text);
            }
        }
        finally
        {
            if (success)
            {
                safeHandle.DangerousRelease();
            }
        }
        return null;
    }
}