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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 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. 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 java.security; | ||
| 27 | |||
| 28 | import java.util.HashMap; | ||
| 29 | import java.util.ArrayList; | ||
| 30 | import java.net.URL; | ||
| 31 | |||
| 32 | import sun.security.util.Debug; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * This class extends ClassLoader with additional support for defining | ||
| 36 | * classes with an associated code source and permissions which are | ||
| 37 | * retrieved by the system policy by default. | ||
| 38 | * | ||
| 39 | * @author Li Gong | ||
| 40 | * @author Roland Schemers | ||
| 41 | */ | ||
| 42 | public class SecureClassLoader extends ClassLoader { | ||
| 43 | /* | ||
| 44 | * If initialization succeed this is set to true and security checks will | ||
| 45 | * succeed. Otherwise the object is not initialized and the object is | ||
| 46 | * useless. | ||
| 47 | */ | ||
| 48 | private final boolean initialized; | ||
| 49 | |||
| 50 | // HashMap that maps CodeSource to ProtectionDomain | ||
| 51 | // @GuardedBy("pdcache") | ||
| 52 | private final HashMap<CodeSource, ProtectionDomain> pdcache = | ||
| 53 | new HashMap<>(11); | ||
| 54 | |||
| 55 | private static final Debug debug = Debug.getInstance("scl"); | ||
| 56 | |||
| 57 | static { | ||
| 58 | ClassLoader.registerAsParallelCapable(); | ||
| 59 | } | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Creates a new SecureClassLoader using the specified parent | ||
| 63 | * class loader for delegation. | ||
| 64 | * | ||
| 65 | * <p>If there is a security manager, this method first | ||
| 66 | * calls the security manager's <code>checkCreateClassLoader</code> | ||
| 67 | * method to ensure creation of a class loader is allowed. | ||
| 68 | * <p> | ||
| 69 | * @param parent the parent ClassLoader | ||
| 70 | * @exception SecurityException if a security manager exists and its | ||
| 71 | * <code>checkCreateClassLoader</code> method doesn't allow | ||
| 72 | * creation of a class loader. | ||
| 73 | * @see SecurityManager#checkCreateClassLoader | ||
| 74 | */ | ||
| 75 | protected SecureClassLoader(ClassLoader parent) { | ||
| 76 | super(parent); | ||
| 77 | // this is to make the stack depth consistent with 1.1 | ||
| 78 | SecurityManager security = System.getSecurityManager(); | ||
| 79 | if (security != null) { | ||
| 80 | security.checkCreateClassLoader(); | ||
| 81 | } | ||
| 82 | initialized = true; | ||
| 83 | } | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Creates a new SecureClassLoader using the default parent class | ||
| 87 | * loader for delegation. | ||
| 88 | * | ||
| 89 | * <p>If there is a security manager, this method first | ||
| 90 | * calls the security manager's <code>checkCreateClassLoader</code> | ||
| 91 | * method to ensure creation of a class loader is allowed. | ||
| 92 | * | ||
| 93 | * @exception SecurityException if a security manager exists and its | ||
| 94 | * <code>checkCreateClassLoader</code> method doesn't allow | ||
| 95 | * creation of a class loader. | ||
| 96 | * @see SecurityManager#checkCreateClassLoader | ||
| 97 | */ | ||
| 98 | protected SecureClassLoader() { | ||
| 99 | super(); | ||
| 100 | // this is to make the stack depth consistent with 1.1 | ||
| 101 | SecurityManager security = System.getSecurityManager(); | ||
| 102 | if (security != null) { | ||
| 103 | security.checkCreateClassLoader(); | ||
| 104 | } | ||
| 105 | initialized = true; | ||
| 106 | } | ||
| 107 | |||
| 108 | /** | ||
| 109 | * Converts an array of bytes into an instance of class Class, | ||
| 110 | * with an optional CodeSource. Before the | ||
| 111 | * class can be used it must be resolved. | ||
| 112 | * <p> | ||
| 113 | * If a non-null CodeSource is supplied a ProtectionDomain is | ||
| 114 | * constructed and associated with the class being defined. | ||
| 115 | * <p> | ||
| 116 | * @param name the expected name of the class, or <code>null</code> | ||
| 117 | * if not known, using '.' and not '/' as the separator | ||
| 118 | * and without a trailing ".class" suffix. | ||
| 119 | * @param b the bytes that make up the class data. The bytes in | ||
| 120 | * positions <code>off</code> through <code>off+len-1</code> | ||
| 121 | * should have the format of a valid class file as defined by | ||
| 122 | * <cite>The Java™ Virtual Machine Specification</cite>. | ||
| 123 | * @param off the start offset in <code>b</code> of the class data | ||
| 124 | * @param len the length of the class data | ||
| 125 | * @param cs the associated CodeSource, or <code>null</code> if none | ||
| 126 | * @return the <code>Class</code> object created from the data, | ||
| 127 | * and optional CodeSource. | ||
| 128 | * @exception ClassFormatError if the data did not contain a valid class | ||
| 129 | * @exception IndexOutOfBoundsException if either <code>off</code> or | ||
| 130 | * <code>len</code> is negative, or if | ||
| 131 | * <code>off+len</code> is greater than <code>b.length</code>. | ||
| 132 | * | ||
| 133 | * @exception SecurityException if an attempt is made to add this class | ||
| 134 | * to a package that contains classes that were signed by | ||
| 135 | * a different set of certificates than this class, or if | ||
| 136 | * the class name begins with "java.". | ||
| 137 | */ | ||
| 138 | protected final Class<?> defineClass(String name, | ||
| 139 | byte[] b, int off, int len, | ||
| 140 | CodeSource cs) | ||
| 141 | { | ||
| 142 | return defineClass(name, b, off, len, getProtectionDomain(cs)); | ||
| 143 | } | ||
| 144 | |||
| 145 | /** | ||
| 146 | * Converts a {@link java.nio.ByteBuffer <tt>ByteBuffer</tt>} | ||
| 147 | * into an instance of class <tt>Class</tt>, with an optional CodeSource. | ||
| 148 | * Before the class can be used it must be resolved. | ||
| 149 | * <p> | ||
| 150 | * If a non-null CodeSource is supplied a ProtectionDomain is | ||
| 151 | * constructed and associated with the class being defined. | ||
| 152 | * <p> | ||
| 153 | * @param name the expected name of the class, or <code>null</code> | ||
| 154 | * if not known, using '.' and not '/' as the separator | ||
| 155 | * and without a trailing ".class" suffix. | ||
| 156 | * @param b the bytes that make up the class data. The bytes from positions | ||
| 157 | * <tt>b.position()</tt> through <tt>b.position() + b.limit() -1</tt> | ||
| 158 | * should have the format of a valid class file as defined by | ||
| 159 | * <cite>The Java™ Virtual Machine Specification</cite>. | ||
| 160 | * @param cs the associated CodeSource, or <code>null</code> if none | ||
| 161 | * @return the <code>Class</code> object created from the data, | ||
| 162 | * and optional CodeSource. | ||
| 163 | * @exception ClassFormatError if the data did not contain a valid class | ||
| 164 | * @exception SecurityException if an attempt is made to add this class | ||
| 165 | * to a package that contains classes that were signed by | ||
| 166 | * a different set of certificates than this class, or if | ||
| 167 | * the class name begins with "java.". | ||
| 168 | * | ||
| 169 | * @since 1.5 | ||
| 170 | */ | ||
| 171 | protected final Class<?> defineClass(String name, java.nio.ByteBuffer b, | ||
| 172 | CodeSource cs) | ||
| 173 | { | ||
| 174 | return defineClass(name, b, getProtectionDomain(cs)); | ||
| 175 | } | ||
| 176 | |||
| 177 | /** | ||
| 178 | * Returns the permissions for the given CodeSource object. | ||
| 179 | * <p> | ||
| 180 | * This method is invoked by the defineClass method which takes | ||
| 181 | * a CodeSource as an argument when it is constructing the | ||
| 182 | * ProtectionDomain for the class being defined. | ||
| 183 | * <p> | ||
| 184 | * @param codesource the codesource. | ||
| 185 | * | ||
| 186 | * @return the permissions granted to the codesource. | ||
| 187 | * | ||
| 188 | */ | ||
| 189 | protected PermissionCollection getPermissions(CodeSource codesource) | ||
| 190 | { | ||
| 191 | check(); | ||
| 192 | return new Permissions(); // ProtectionDomain defers the binding | ||
| 193 | } | ||
| 194 | |||
| 195 | /* | ||
| 196 | * Returned cached ProtectionDomain for the specified CodeSource. | ||
| 197 | */ | ||
| 198 | private ProtectionDomain getProtectionDomain(CodeSource cs) { | ||
| 199 | if (cs == null) | ||
| 200 | return null; | ||
| 201 | |||
| 202 | ProtectionDomain pd = null; | ||
| 203 | synchronized (pdcache) { | ||
| 204 | pd = pdcache.get(cs); | ||
| 205 | if (pd == null) { | ||
| 206 | PermissionCollection perms = getPermissions(cs); | ||
| 207 | pd = new ProtectionDomain(cs, perms, this, null); | ||
| 208 | pdcache.put(cs, pd); | ||
| 209 | if (debug != null) { | ||
| 210 | debug.println(" getPermissions "+ pd); | ||
| 211 | debug.println(""); | ||
| 212 | } | ||
| 213 | } | ||
| 214 | } | ||
| 215 | return pd; | ||
| 216 | } | ||
| 217 | |||
| 218 | /* | ||
| 219 | * Check to make sure the class loader has been initialized. | ||
| 220 | */ | ||
| 221 | private void check() { | ||
| 222 | if (!initialized) { | ||
| 223 | throw new SecurityException("ClassLoader object not initialized"); | ||
| 224 | } | ||
| 225 | } | ||
| 226 | |||
| 227 | } | ||