jdk/src/share/classes/com/sun/jndi/ldap/VersionHelper12.java
changeset 25819 1066175d41ab
parent 25818 30a18bb9b88d
parent 25817 b293b0e3fbaa
child 25831 3fce8370cad4
equal deleted inserted replaced
25818:30a18bb9b88d 25819:1066175d41ab
     1 /*
       
     2  * Copyright (c) 1999, 2013, 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.  Oracle designates this
       
     8  * particular file as subject to the "Classpath" exception as provided
       
     9  * by Oracle in the LICENSE file that accompanied this code.
       
    10  *
       
    11  * This code is distributed in the hope that it will be useful, but WITHOUT
       
    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
       
    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
       
    14  * version 2 for more details (a copy is included in the LICENSE file that
       
    15  * accompanied this code).
       
    16  *
       
    17  * You should have received a copy of the GNU General Public License version
       
    18  * 2 along with this work; if not, write to the Free Software Foundation,
       
    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
       
    20  *
       
    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
       
    22  * or visit www.oracle.com if you need additional information or have any
       
    23  * questions.
       
    24  */
       
    25 
       
    26 package com.sun.jndi.ldap;
       
    27 
       
    28 import java.net.URLClassLoader;
       
    29 import java.net.MalformedURLException;
       
    30 import java.security.AccessControlContext;
       
    31 import java.security.AccessController;
       
    32 import java.security.PrivilegedAction;
       
    33 import sun.misc.SharedSecrets;
       
    34 
       
    35 final class VersionHelper12 extends VersionHelper {
       
    36 
       
    37     // System property to control whether classes may be loaded from an
       
    38     // arbitrary URL code base.
       
    39     private static final String TRUST_URL_CODEBASE_PROPERTY =
       
    40         "com.sun.jndi.ldap.object.trustURLCodebase";
       
    41 
       
    42     // Determine whether classes may be loaded from an arbitrary URL code base.
       
    43     private static final String trustURLCodebase =
       
    44         AccessController.doPrivileged(
       
    45             new PrivilegedAction<String>() {
       
    46                 public String run() {
       
    47                     return System.getProperty(TRUST_URL_CODEBASE_PROPERTY,
       
    48                             "false");
       
    49                 }
       
    50             }
       
    51         );
       
    52 
       
    53     VersionHelper12() {} // Disallow external from creating one of these.
       
    54 
       
    55     ClassLoader getURLClassLoader(String[] url)
       
    56         throws MalformedURLException {
       
    57             ClassLoader parent = getContextClassLoader();
       
    58             /*
       
    59              * Classes may only be loaded from an arbitrary URL code base when
       
    60              * the system property com.sun.jndi.ldap.object.trustURLCodebase
       
    61              * has been set to "true".
       
    62              */
       
    63             if (url != null && "true".equalsIgnoreCase(trustURLCodebase)) {
       
    64                 return URLClassLoader.newInstance(getUrlArray(url), parent);
       
    65             } else {
       
    66                 return parent;
       
    67             }
       
    68     }
       
    69 
       
    70     Class<?> loadClass(String className) throws ClassNotFoundException {
       
    71         ClassLoader cl = getContextClassLoader();
       
    72         return Class.forName(className, true, cl);
       
    73     }
       
    74 
       
    75     private ClassLoader getContextClassLoader() {
       
    76         return AccessController.doPrivileged(
       
    77             new PrivilegedAction<ClassLoader>() {
       
    78                 public ClassLoader run() {
       
    79                     return Thread.currentThread().getContextClassLoader();
       
    80                 }
       
    81             }
       
    82         );
       
    83     }
       
    84 
       
    85     Thread createThread(final Runnable r) {
       
    86         final AccessControlContext acc = AccessController.getContext();
       
    87         // 4290486: doPrivileged is needed to create a thread in
       
    88         // an environment that restricts "modifyThreadGroup".
       
    89         return AccessController.doPrivileged(
       
    90                 new PrivilegedAction<Thread>() {
       
    91                     public Thread run() {
       
    92                         return SharedSecrets.getJavaLangAccess()
       
    93                                 .newThreadWithAcc(r, acc);
       
    94                     }
       
    95                 }
       
    96         );
       
    97     }
       
    98 }