1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.jndi.ldap; |
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27 |
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28 import java.net.URLClassLoader; |
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29 import java.net.MalformedURLException; |
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30 import java.security.AccessControlContext; |
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31 import java.security.AccessController; |
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32 import java.security.PrivilegedAction; |
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33 import sun.misc.SharedSecrets; |
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34 |
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35 final class VersionHelper12 extends VersionHelper { |
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36 |
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37 // System property to control whether classes may be loaded from an |
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38 // arbitrary URL code base. |
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39 private static final String TRUST_URL_CODEBASE_PROPERTY = |
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40 "com.sun.jndi.ldap.object.trustURLCodebase"; |
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41 |
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42 // Determine whether classes may be loaded from an arbitrary URL code base. |
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43 private static final String trustURLCodebase = |
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44 AccessController.doPrivileged( |
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45 new PrivilegedAction<String>() { |
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46 public String run() { |
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47 return System.getProperty(TRUST_URL_CODEBASE_PROPERTY, |
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48 "false"); |
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49 } |
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50 } |
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51 ); |
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52 |
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53 VersionHelper12() {} // Disallow external from creating one of these. |
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54 |
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55 ClassLoader getURLClassLoader(String[] url) |
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56 throws MalformedURLException { |
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57 ClassLoader parent = getContextClassLoader(); |
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58 /* |
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59 * Classes may only be loaded from an arbitrary URL code base when |
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60 * the system property com.sun.jndi.ldap.object.trustURLCodebase |
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61 * has been set to "true". |
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62 */ |
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63 if (url != null && "true".equalsIgnoreCase(trustURLCodebase)) { |
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64 return URLClassLoader.newInstance(getUrlArray(url), parent); |
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65 } else { |
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66 return parent; |
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67 } |
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68 } |
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69 |
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70 Class<?> loadClass(String className) throws ClassNotFoundException { |
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71 ClassLoader cl = getContextClassLoader(); |
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72 return Class.forName(className, true, cl); |
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73 } |
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74 |
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75 private ClassLoader getContextClassLoader() { |
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76 return AccessController.doPrivileged( |
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77 new PrivilegedAction<ClassLoader>() { |
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78 public ClassLoader run() { |
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79 return Thread.currentThread().getContextClassLoader(); |
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80 } |
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81 } |
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82 ); |
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83 } |
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84 |
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85 Thread createThread(final Runnable r) { |
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86 final AccessControlContext acc = AccessController.getContext(); |
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87 // 4290486: doPrivileged is needed to create a thread in |
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88 // an environment that restricts "modifyThreadGroup". |
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89 return AccessController.doPrivileged( |
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90 new PrivilegedAction<Thread>() { |
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91 public Thread run() { |
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92 return SharedSecrets.getJavaLangAccess() |
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93 .newThreadWithAcc(r, acc); |
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94 } |
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95 } |
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96 ); |
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97 } |
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98 } |
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