129 lines
5.0 KiB
Java
129 lines
5.0 KiB
Java
/*
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* Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.jndi.ldap;
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import java.net.URLClassLoader;
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import java.net.MalformedURLException;
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import java.security.AccessControlContext;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import sun.misc.SharedSecrets;
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final class VersionHelper12 extends VersionHelper {
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// System property to control whether classes may be loaded from an
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// arbitrary URL code base.
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private static final String TRUST_URL_CODEBASE_PROPERTY =
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"com.sun.jndi.ldap.object.trustURLCodebase";
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// System property to control whether classes are allowed to be loaded from
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// 'javaSerializedData', 'javaRemoteLocation' or 'javaReferenceAddress' attributes.
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private static final String TRUST_SERIAL_DATA_PROPERTY =
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"com.sun.jndi.ldap.object.trustSerialData";
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/**
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* Determines whether objects may be deserialized or reconstructed from a content of
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* 'javaSerializedData', 'javaRemoteLocation' or 'javaReferenceAddress' LDAP attributes.
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*/
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private static final boolean trustSerialData;
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// Determine whether classes may be loaded from an arbitrary URL code base.
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private static final boolean trustURLCodebase;
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static {
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String trust = getPrivilegedProperty(TRUST_URL_CODEBASE_PROPERTY, "false");
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trustURLCodebase = "true".equalsIgnoreCase(trust);
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String trustSDString = getPrivilegedProperty(TRUST_SERIAL_DATA_PROPERTY, "false");
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trustSerialData = "true".equalsIgnoreCase(trustSDString);
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}
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private static String getPrivilegedProperty(String propertyName, String defaultVal) {
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PrivilegedAction<String> action = () -> System.getProperty(propertyName, defaultVal);
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if (System.getSecurityManager() == null) {
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return action.run();
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} else {
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return AccessController.doPrivileged(action);
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}
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}
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VersionHelper12() {} // Disallow external from creating one of these.
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/**
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* Returns true if deserialization or reconstruction of objects from
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* 'javaSerializedData', 'javaRemoteLocation' and 'javaReferenceAddress'
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* LDAP attributes is allowed.
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*
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* @return true if deserialization is allowed; false - otherwise
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*/
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public static boolean isSerialDataAllowed() {
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return trustSerialData;
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}
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ClassLoader getURLClassLoader(String[] url)
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throws MalformedURLException {
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ClassLoader parent = getContextClassLoader();
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/*
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* Classes may only be loaded from an arbitrary URL code base when
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* the system property com.sun.jndi.ldap.object.trustURLCodebase
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* has been set to "true".
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*/
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if (url != null && trustURLCodebase) {
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return URLClassLoader.newInstance(getUrlArray(url), parent);
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} else {
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return parent;
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}
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}
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Class<?> loadClass(String className) throws ClassNotFoundException {
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ClassLoader cl = getContextClassLoader();
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return Class.forName(className, true, cl);
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}
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private ClassLoader getContextClassLoader() {
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return AccessController.doPrivileged(
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new PrivilegedAction<ClassLoader>() {
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public ClassLoader run() {
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return Thread.currentThread().getContextClassLoader();
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}
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}
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);
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}
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Thread createThread(final Runnable r) {
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final AccessControlContext acc = AccessController.getContext();
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// 4290486: doPrivileged is needed to create a thread in
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// an environment that restricts "modifyThreadGroup".
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return AccessController.doPrivileged(
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new PrivilegedAction<Thread>() {
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public Thread run() {
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return SharedSecrets.getJavaLangAccess()
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.newThreadWithAcc(r, acc);
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}
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}
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);
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}
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}
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