Added IsLoopback.

Author: tyranid

NtApiDotNet/Win32/Security/Authentication/ClientAuthenticationContext.cs

@@ -180,6 +180,11 @@ private void Dispose(bool _)
         /// </summary>
         public SchannelConnectionInfo ConnectionInfo => SecurityContextUtils.GetConnectionInfo(Context);
 
+        /// <summary>
+        /// Get whether the authentication context is for loopback.
+        /// </summary>
+        public bool IsLoopback => SecurityContextUtils.GetIsLoopback(Context);
+
         #endregion
 
         #region Constructors

NtApiDotNet/Win32/Security/Authentication/SecurityContextUtils.cs

@@ -303,6 +303,12 @@ internal static SecPkgContext_StreamSizes GetStreamSizes(SecHandle context)
             return QueryContextAttribute<SecPkgContext_StreamSizes>(context, SECPKG_ATTR.STREAM_SIZES);
         }
 
+        internal static bool GetIsLoopback(SecHandle context)
+        {
+            var res = QueryContextAttributeNoThrow<int>(context, SECPKG_ATTR.IS_LOOPBACK);
+            return res.Item1 != 0;
+        }
+
         internal static ExportedSecurityContext ExportContext(SecHandle context, SecPkgContextExportFlags export_flags, string package, bool client)
         {
             if (context is null)

NtApiDotNet/Win32/Security/Authentication/ServerAuthenticationContext.cs

@@ -191,6 +191,11 @@ private string GetTargetName()
         /// </summary>
         public X509Certificate2 RemoteCertificate => SecurityContextUtils.GetRemoteCertificate(Context);
 
+        /// <summary>
+        /// Get whether the authentication context is for loopback.
+        /// </summary>
+        public bool IsLoopback => SecurityContextUtils.GetIsLoopback(Context);
+
         #endregion
 
         #region Public Methods