8262389: Use permitted_enctypes if default_tkt_enctypes or default_tgs_enctypes is not present

Reviewed-by: mullan

Author: wangweij

src/java.security.jgss/share/classes/sun/security/krb5/Config.java

@@ -979,6 +979,9 @@ public void listTable() {
     public int[] defaultEtype(String configName) throws KrbException {
         String default_enctypes;
         default_enctypes = get("libdefaults", configName);
+        if (default_enctypes == null && !configName.equals("permitted_enctypes")) {
+            default_enctypes = get("libdefaults", "permitted_enctypes");
+        }
         int[] etype;
         if (default_enctypes == null) {
             if (DEBUG) {

test/jdk/sun/security/krb5/etype/Permitted.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2021, 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 8262389
+ * @modules java.security.jgss/sun.security.krb5
+ * @library /test/lib
+ * @summary Use permitted_enctypes if default_tkt_enctypes or default_tgs_enctypes is not present
+ */
+
+import jdk.test.lib.Asserts;
+import sun.security.krb5.Config;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+public class Permitted {
+    public static void main(String[] args) throws Exception {
+
+        System.setProperty("java.security.krb5.conf", "permitted.conf");
+
+        Files.write(Path.of("permitted.conf"), List.of("[libdefaults]",
+                "permitted_enctypes = aes128-cts"));
+        Config.refresh();
+        Asserts.assertEQ(Config.getInstance().defaultEtype("default_tkt_enctypes").length, 1);
+        Asserts.assertEQ(Config.getInstance().defaultEtype("default_tgs_enctypes").length, 1);
+
+        Files.write(Path.of("permitted.conf"), List.of("[libdefaults]",
+                "default_tkt_enctypes = aes128-cts aes256-cts",
+                "default_tgs_enctypes = aes128-cts aes256-cts aes256-sha2",
+                "permitted_enctypes = aes128-cts"));
+        Config.refresh();
+        Asserts.assertEQ(Config.getInstance().defaultEtype("default_tkt_enctypes").length, 2);
+        Asserts.assertEQ(Config.getInstance().defaultEtype("default_tgs_enctypes").length, 3);
+    }
+}