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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [security/] [SecureClassLoader.java] - Rev 781
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/* SecureClassLoader.java --- A Secure Class Loader Copyright (C) 1999, 2004, 2006 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package java.security; import java.nio.ByteBuffer; import java.util.HashMap; /** * A Secure Class Loader for loading classes with additional * support for specifying code source and permissions when * they are retrieved by the system policy handler. * * @since 1.2 * * @author Mark Benvenuto */ public class SecureClassLoader extends ClassLoader { private final HashMap<CodeSource,ProtectionDomain> protectionDomainCache = new HashMap<CodeSource, ProtectionDomain>(); protected SecureClassLoader(ClassLoader parent) { super(parent); } protected SecureClassLoader() { } /** * Creates a class using an array of bytes and a * CodeSource. * * @param name the name to give the class. null if unknown. * @param b the data representing the classfile, in classfile format. * @param off the offset into the data where the classfile starts. * @param len the length of the classfile data in the array. * @param cs the CodeSource for the class or null when unknown. * * @return the class that was defined and optional CodeSource. * * @exception ClassFormatError if the byte array is not in proper classfile format. */ protected final Class<?> defineClass(String name, byte[] b, int off, int len, CodeSource cs) { return super.defineClass(name, b, off, len, getProtectionDomain(cs)); } /** * Creates a class using an ByteBuffer and a * CodeSource. * * @param name the name to give the class. null if unknown. * @param b the data representing the classfile, in classfile format. * @param cs the CodeSource for the class or null when unknown. * * @return the class that was defined and optional CodeSource. * * @exception ClassFormatError if the byte array is not in proper classfile format. * * @since 1.5 */ protected final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs) { return super.defineClass(name, b, getProtectionDomain(cs)); } /* Lookup or create a protection domain for the CodeSource, * if CodeSource is null it will return null. */ private ProtectionDomain getProtectionDomain(CodeSource cs) { ProtectionDomain protectionDomain = null; if (cs != null) { synchronized (protectionDomainCache) { protectionDomain = protectionDomainCache.get(cs); } if (protectionDomain == null) { protectionDomain = new ProtectionDomain(cs, getPermissions(cs), this, null); synchronized (protectionDomainCache) { ProtectionDomain domain = protectionDomainCache.get(cs); if (domain == null) protectionDomainCache.put(cs, protectionDomain); else protectionDomain = domain; } } } return protectionDomain; } /** * Returns a PermissionCollection for the specified CodeSource. * The default implementation invokes * java.security.Policy.getPermissions. * * This method is called by defineClass that takes a CodeSource * argument to build a proper ProtectionDomain for the class * being defined. */ protected PermissionCollection getPermissions(CodeSource cs) { Policy policy = Policy.getCurrentPolicy(); return policy.getPermissions(cs); } }
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