From de853f33be96a250899e30b92c65d32c043541b7 Mon Sep 17 00:00:00 2001
From: Daniel Widdis <widdis@gmail.com>
Date: Thu, 25 Nov 2021 21:23:15 -0800
Subject: [PATCH] Increase Sspi#MAX_TOKEN_SIZE on Windows 8/Server 2012 and
 later

---
 CHANGES.md                                         |  1 +
 .../src/com/sun/jna/platform/win32/Sspi.java       | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index 79141e665e..da90f03d55 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,6 +7,7 @@ Next Release (5.11.0)
 
 Features
 --------
+* [#1398](https://github.com/java-native-access/jna/pull/1398): Increase `c.s.j.p.win32.Sspi#MAX_TOKEN_SIZE` on Windows 8/Server 2012 and later - [@dbwiddis](https://github.com/dbwiddis).
 
 Bug Fixes
 ---------
diff --git a/contrib/platform/src/com/sun/jna/platform/win32/Sspi.java b/contrib/platform/src/com/sun/jna/platform/win32/Sspi.java
index c77410128f..d2859dafc2 100644
--- a/contrib/platform/src/com/sun/jna/platform/win32/Sspi.java
+++ b/contrib/platform/src/com/sun/jna/platform/win32/Sspi.java
@@ -37,9 +37,19 @@
 public interface Sspi {
 
     /**
-     * Maximum size in bytes of a security token.
+     * Maximum size in bytes of a security token. {@code MAX_TOKEN_SIZE} has the
+     * following default value, depending on the version of Windows that builds the
+     * token:
+     * <p>
+     * Windows Server 2008 R2 and earlier versions, and Windows 7 and earlier
+     * versions: 12,000 bytes. Windows Server 2012 and later versions, and Windows 8
+     * and later versions: 48,000 bytes
+     *
+     * @see <a href=
+     *      "https://docs.microsoft.com/en-us/troubleshoot/windows-server/windows-security/kerberos-authentication-problems-if-user-belongs-to-groups">Problems
+     *      with Kerberos authentication when a user belongs to many groups</a>
      */
-    int MAX_TOKEN_SIZE = 12288;
+    int MAX_TOKEN_SIZE = VersionHelpers.IsWindows8OrGreater() ? 48000 : 12000;
 
     // Flags for the fCredentialUse parameter of AcquireCredentialsHandle