1/*
2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 4893489
27 * @summary     Subject.doAs not thread-safe against changes to principals
28 */
29
30import java.security.Principal;
31import java.security.PrivilegedAction;
32import java.util.Collections;
33import java.util.Set;
34import javax.security.auth.Subject;
35import javax.security.auth.x500.X500Principal;
36
37public class Synch {
38    static volatile boolean finished = false;
39    public static void main(String[] args) {
40        Subject subject = new Subject();
41        final Set principals = subject.getPrincipals();
42        principals.add(new X500Principal("CN=Alice"));
43        new Thread() {
44            public void run() {
45                Principal last = new X500Principal("CN=Bob");
46                for (int i = 0; !finished; i++) {
47                    Principal next = new X500Principal("CN=Bob" + i);
48                    principals.add(next);
49                    principals.remove(last);
50                    last = next;
51                }
52            }
53        }.start();
54        for (int i = 0; i < 1000; i++) {
55            Subject.doAs(
56                subject,
57                new PrivilegedAction() {
58                    public Object run() {
59                        return Subject.doAs(
60                            new Subject(true,
61                                        Collections.singleton(
62                                            new X500Principal("CN=Claire")),
63                                        Collections.EMPTY_SET,
64                                        Collections.EMPTY_SET),
65                            new PrivilegedAction() {
66                                public Object run() {
67                                    return null;
68                                }
69                            });
70                    }
71                });
72        }
73        finished = true;
74    }
75}
76