From 97a48adf4afb503e1f3dc5fcb9c8213cf9b08b5f Mon Sep 17 00:00:00 2001
From: Tal Aloni <tal.aloni.il@gmail.com>
Date: Fri, 25 Aug 2017 02:29:42 +0300
Subject: [PATCH] GSSProvider: Properly handle invalid SPNEGO Token

---
 SMBLibrary/Authentication/GSSAPI/GSSProvider.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/SMBLibrary/Authentication/GSSAPI/GSSProvider.cs b/SMBLibrary/Authentication/GSSAPI/GSSProvider.cs
index c5d3167..ac32502 100644
--- a/SMBLibrary/Authentication/GSSAPI/GSSProvider.cs
+++ b/SMBLibrary/Authentication/GSSAPI/GSSProvider.cs
@@ -54,7 +54,15 @@ namespace SMBLibrary.Authentication.GSSAPI
         public virtual NTStatus AcceptSecurityContext(ref GSSContext context, byte[] inputToken, out byte[] outputToken)
         {
             outputToken = null;
-            SimpleProtectedNegotiationToken spnegoToken = SimpleProtectedNegotiationToken.ReadToken(inputToken, 0);
+            SimpleProtectedNegotiationToken spnegoToken = null;
+            try
+            {
+                spnegoToken = SimpleProtectedNegotiationToken.ReadToken(inputToken, 0);
+            }
+            catch
+            {
+            }
+
             if (spnegoToken != null)
             {
                 if (spnegoToken is SimpleProtectedNegotiationTokenInit)