--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/security/krb5/auto/S4U2proxy.java	Wed Nov 07 14:13:01 2012 +0800
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 6355584
+ * @summary Introduce constrained Kerberos delegation
+ * @compile -XDignore.symbol.file S4U2proxy.java
+ * @run main/othervm S4U2proxy krb5
+ * @run main/othervm S4U2proxy spnego
+ */
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.ietf.jgss.Oid;
+import sun.security.jgss.GSSUtil;
+
+public class S4U2proxy {
+
+    public static void main(String[] args) throws Exception {
+        Oid mech;
+        if (args[0].equals("spnego")) {
+            mech = GSSUtil.GSS_SPNEGO_MECH_OID;
+        } else if (args[0].contains("krb5")) {
+            mech = GSSUtil.GSS_KRB5_MECH_OID;
+        } else {
+            throw new Exception("Unknown mech");
+        }
+
+        OneKDC kdc = new OneKDC(null);
+        kdc.writeJAASConf();
+        kdc.setOption(KDC.Option.PREAUTH_REQUIRED, false);
+        Map<String,List<String>> map = new HashMap<>();
+        map.put(OneKDC.SERVER + "@" + OneKDC.REALM, Arrays.asList(
+                new String[]{OneKDC.BACKEND + "@" + OneKDC.REALM}));
+        kdc.setOption(KDC.Option.ALLOW_S4U2PROXY, map);
+
+        Context c, s, b;
+        c = Context.fromJAAS("client");
+        s = Context.fromJAAS("server");
+        b = Context.fromJAAS("backend");
+
+        c.startAsClient(OneKDC.SERVER, mech);
+        s.startAsServer(null, mech, false);
+
+        Context.handshake(c, s);
+        Context p = s.delegated();
+
+        p.startAsClient(OneKDC.BACKEND, mech);
+        b.startAsServer(mech);
+        Context.handshake(p, b);
+
+        p.startAsClient(OneKDC.BACKEND, mech);
+        b.startAsServer(mech);
+        Context.handshake(p, b);
+    }
+}