Fix issue with INdrStructure type check during unmarshalling and expose authentication context on the RcpConnectedClientTransport class (#35)

* Fix issue where INdrStructure derived type was not unmarshalled correctly

* Expose RpcConnectedClientTransport authentication context as a public property

* Added XML comment to get rid of compiler warnings.

Author: CCob

NtApiDotNet/Ndr/Marshal/NdrUnmarshalBuffer.cs

@@ -390,7 +390,7 @@ public T[] ReadConformantArray<T>() where T : struct
             {
                 return ReadConformantCharArray().Cast<char, T>();
             }
-            else if (typeof(T) == typeof(INdrStructure))
+            else if (typeof(INdrStructure).IsAssignableFrom(typeof(T)))
             {
                 using (var queue = _deferred_reads.Push())
                 {

NtApiDotNet/Win32/Rpc/Transport/RpcConnectedClientTransport.cs

@@ -482,6 +482,11 @@ private void BindAuth(Guid interface_id, Version interface_version, Guid transfe
         /// </summary>
         public RpcAuthenticationLevel AuthenticationLevel => Authenticated ? _transport_security.AuthenticationLevel : RpcAuthenticationLevel.None;
 
+        /// <summary>
+        /// Get the transport authentication context.
+        /// </summary>
+        public IClientAuthenticationContext AuthenticationContext => _auth_context;
+
         /// <summary>
         /// Get the current Call ID.
         /// </summary>