| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.security; |
| |
| import java.nio.ByteBuffer; |
| import java.util.HashMap; |
| |
| /** |
| * {@code SecureClassLoader} represents a {@code ClassLoader} which associates |
| * the classes it loads with a code source and provide mechanisms to allow the |
| * relevant permissions to be retrieved. |
| */ |
| public class SecureClassLoader extends ClassLoader { |
| |
| // A cache of ProtectionDomains for a given CodeSource |
| private HashMap<CodeSource, ProtectionDomain> pds = new HashMap<CodeSource, ProtectionDomain>(); |
| |
| /** |
| * Constructs a new instance of {@code SecureClassLoader}. The default |
| * parent {@code ClassLoader} is used. |
| */ |
| protected SecureClassLoader() { |
| } |
| |
| /** |
| * Constructs a new instance of {@code SecureClassLoader} with the specified |
| * parent {@code ClassLoader}. |
| * |
| * @param parent |
| * the parent {@code ClassLoader}. |
| */ |
| protected SecureClassLoader(ClassLoader parent) { |
| super(parent); |
| } |
| |
| /** |
| * Returns the {@code PermissionCollection} for the specified {@code |
| * CodeSource}. |
| * |
| * @param codesource |
| * the code source. |
| * @return the {@code PermissionCollection} for the specified {@code |
| * CodeSource}. |
| */ |
| protected PermissionCollection getPermissions(CodeSource codesource) { |
| // Do nothing by default, ProtectionDomain will take care about |
| // permissions in dynamic |
| return new Permissions(); |
| } |
| |
| /** |
| * Constructs a new class from an array of bytes containing a class |
| * definition in class file format with an optional {@code CodeSource}. |
| * |
| * @param name |
| * the name of the new class. |
| * @param b |
| * a memory image of a class file. |
| * @param off |
| * the start offset in b of the class data. |
| * @param len |
| * the length of the class data. |
| * @param cs |
| * the {@code CodeSource}, or {@code null}. |
| * @return a new class. |
| * @throws IndexOutOfBoundsException |
| * if {@code off} or {@code len} are not valid in respect to |
| * {@code b}. |
| * @throws ClassFormatError |
| * if the specified data is not valid class data. |
| * @throws SecurityException |
| * if the package to which this class is to be added, already |
| * contains classes which were signed by different certificates, |
| * or if the class name begins with "java." |
| */ |
| protected final Class<?> defineClass(String name, byte[] b, int off, int len, |
| CodeSource cs) { |
| return cs == null ? defineClass(name, b, off, len) : defineClass(name, |
| b, off, len, getPD(cs)); |
| } |
| |
| /** |
| * Constructs a new class from an array of bytes containing a class |
| * definition in class file format with an optional {@code CodeSource}. |
| * |
| * @param name |
| * the name of the new class. |
| * @param b |
| * a memory image of a class file. |
| * @param cs |
| * the {@code CodeSource}, or {@code null}. |
| * @return a new class. |
| * @throws ClassFormatError |
| * if the specified data is not valid class data. |
| * @throws SecurityException |
| * if the package to which this class is to be added, already |
| * contains classes which were signed by different certificates, |
| * or if the class name begins with "java." |
| */ |
| protected final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs) { |
| //FIXME 1.5 - remove b.array(), call super.defineClass(,ByteBuffer,) |
| // directly |
| byte[] data = b.array(); |
| return cs == null ? defineClass(name, data, 0, data.length) |
| : defineClass(name, data, 0, data.length, getPD(cs)); |
| } |
| |
| // Constructs and caches ProtectionDomain for the given CodeSource |
| // object.<br> |
| // It calls {@link getPermissions()} to get a set of permissions. |
| // |
| // @param cs CodeSource object |
| // @return ProtectionDomain for the passed CodeSource object |
| private ProtectionDomain getPD(CodeSource cs) { |
| if (cs == null) { |
| return null; |
| } |
| // need to cache PDs, otherwise every class from a given CodeSource |
| // will have it's own ProtectionDomain, which does not look right. |
| ProtectionDomain pd; |
| synchronized (pds) { |
| if ((pd = pds.get(cs)) != null) { |
| return pd; |
| } |
| PermissionCollection perms = getPermissions(cs); |
| pd = new ProtectionDomain(cs, perms, this, null); |
| pds.put(cs, pd); |
| } |
| return pd; |
| } |
| } |