| /* |
| * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.security; |
| |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.function.Function; |
| |
| import sun.security.util.Debug; |
| |
| /** |
| * This class extends ClassLoader with additional support for defining |
| * classes with an associated code source and permissions which are |
| * retrieved by the system policy by default. |
| * |
| * @author Li Gong |
| * @author Roland Schemers |
| * @since 1.2 |
| */ |
| public class SecureClassLoader extends ClassLoader { |
| /* |
| * If initialization succeed this is set to true and security checks will |
| * succeed. Otherwise the object is not initialized and the object is |
| * useless. |
| */ |
| private final boolean initialized; |
| |
| /* |
| * Map that maps the CodeSource to a ProtectionDomain. The key is a |
| * CodeSourceKey class that uses a String instead of a URL to avoid |
| * potential expensive name service lookups. This does mean that URLs that |
| * are equivalent after nameservice lookup will be placed in separate |
| * ProtectionDomains; however during policy enforcement these URLs will be |
| * canonicalized and resolved resulting in a consistent set of granted |
| * permissions. |
| */ |
| private final Map<CodeSourceKey, ProtectionDomain> pdcache |
| = new ConcurrentHashMap<>(11); |
| |
| static { |
| ClassLoader.registerAsParallelCapable(); |
| } |
| |
| /** |
| * Creates a new SecureClassLoader using the specified parent |
| * class loader for delegation. |
| * |
| * <p>If there is a security manager, this method first |
| * calls the security manager's {@code checkCreateClassLoader} |
| * method to ensure creation of a class loader is allowed. |
| * |
| * @param parent the parent ClassLoader |
| * @exception SecurityException if a security manager exists and its |
| * {@code checkCreateClassLoader} method doesn't allow |
| * creation of a class loader. |
| * @see SecurityManager#checkCreateClassLoader |
| */ |
| protected SecureClassLoader(ClassLoader parent) { |
| super(parent); |
| // this is to make the stack depth consistent with 1.1 |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkCreateClassLoader(); |
| } |
| initialized = true; |
| } |
| |
| /** |
| * Creates a new SecureClassLoader using the default parent class |
| * loader for delegation. |
| * |
| * <p>If there is a security manager, this method first |
| * calls the security manager's {@code checkCreateClassLoader} |
| * method to ensure creation of a class loader is allowed. |
| * |
| * @exception SecurityException if a security manager exists and its |
| * {@code checkCreateClassLoader} method doesn't allow |
| * creation of a class loader. |
| * @see SecurityManager#checkCreateClassLoader |
| */ |
| protected SecureClassLoader() { |
| super(); |
| // this is to make the stack depth consistent with 1.1 |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkCreateClassLoader(); |
| } |
| initialized = true; |
| } |
| |
| /** |
| * Creates a new {@code SecureClassLoader} of the specified name and |
| * using the specified parent class loader for delegation. |
| * |
| * @param name class loader name; or {@code null} if not named |
| * @param parent the parent class loader |
| * |
| * @throws IllegalArgumentException if the given name is empty. |
| * |
| * @throws SecurityException if a security manager exists and its |
| * {@link SecurityManager#checkCreateClassLoader()} method |
| * doesn't allow creation of a class loader. |
| * |
| * @since 9 |
| * @spec JPMS |
| */ |
| protected SecureClassLoader(String name, ClassLoader parent) { |
| super(name, parent); |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkCreateClassLoader(); |
| } |
| initialized = true; |
| } |
| |
| /** |
| * Converts an array of bytes into an instance of class Class, |
| * with an optional CodeSource. Before the |
| * class can be used it must be resolved. |
| * <p> |
| * If a non-null CodeSource is supplied a ProtectionDomain is |
| * constructed and associated with the class being defined. |
| * |
| * @param name the expected name of the class, or {@code null} |
| * if not known, using '.' and not '/' as the separator |
| * and without a trailing ".class" suffix. |
| * @param b the bytes that make up the class data. The bytes in |
| * positions {@code off} through {@code off+len-1} |
| * should have the format of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * @param off the start offset in {@code b} of the class data |
| * @param len the length of the class data |
| * @param cs the associated CodeSource, or {@code null} if none |
| * @return the {@code Class} object created from the data, |
| * and optional CodeSource. |
| * @exception ClassFormatError if the data did not contain a valid class |
| * @exception IndexOutOfBoundsException if either {@code off} or |
| * {@code len} is negative, or if |
| * {@code off+len} is greater than {@code b.length}. |
| * |
| * @exception SecurityException if an attempt is made to add this class |
| * to a package that contains classes that were signed by |
| * a different set of certificates than this class, or if |
| * the class name begins with "java.". |
| */ |
| protected final Class<?> defineClass(String name, |
| byte[] b, int off, int len, |
| CodeSource cs) |
| { |
| return defineClass(name, b, off, len, getProtectionDomain(cs)); |
| } |
| |
| /** |
| * Converts a {@link java.nio.ByteBuffer ByteBuffer} |
| * into an instance of class {@code Class}, with an optional CodeSource. |
| * Before the class can be used it must be resolved. |
| * <p> |
| * If a non-null CodeSource is supplied a ProtectionDomain is |
| * constructed and associated with the class being defined. |
| * |
| * @param name the expected name of the class, or {@code null} |
| * if not known, using '.' and not '/' as the separator |
| * and without a trailing ".class" suffix. |
| * @param b the bytes that make up the class data. The bytes from positions |
| * {@code b.position()} through {@code b.position() + b.limit() -1} |
| * should have the format of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * @param cs the associated CodeSource, or {@code null} if none |
| * @return the {@code Class} object created from the data, |
| * and optional CodeSource. |
| * @exception ClassFormatError if the data did not contain a valid class |
| * @exception SecurityException if an attempt is made to add this class |
| * to a package that contains classes that were signed by |
| * a different set of certificates than this class, or if |
| * the class name begins with "java.". |
| * |
| * @since 1.5 |
| */ |
| protected final Class<?> defineClass(String name, java.nio.ByteBuffer b, |
| CodeSource cs) |
| { |
| return defineClass(name, b, getProtectionDomain(cs)); |
| } |
| |
| /** |
| * Returns the permissions for the given CodeSource object. |
| * <p> |
| * This method is invoked by the defineClass method which takes |
| * a CodeSource as an argument when it is constructing the |
| * ProtectionDomain for the class being defined. |
| * |
| * @param codesource the codesource. |
| * |
| * @return the permissions granted to the codesource. |
| * |
| */ |
| protected PermissionCollection getPermissions(CodeSource codesource) |
| { |
| check(); |
| return new Permissions(); // ProtectionDomain defers the binding |
| } |
| |
| /* |
| * holder class for the static field "debug" to delay its initialization |
| */ |
| private static class DebugHolder { |
| private static final Debug debug = Debug.getInstance("scl"); |
| } |
| |
| /* |
| * Returned cached ProtectionDomain for the specified CodeSource. |
| */ |
| private ProtectionDomain getProtectionDomain(CodeSource cs) { |
| if (cs == null) { |
| return null; |
| } |
| |
| // Use a CodeSourceKey object key. It should behave in the |
| // same manner as the CodeSource when compared for equality except |
| // that no nameservice lookup is done on the hostname (String comparison |
| // only), and the fragment is not considered. |
| CodeSourceKey key = new CodeSourceKey(cs); |
| return pdcache.computeIfAbsent(key, new Function<>() { |
| @Override |
| public ProtectionDomain apply(CodeSourceKey key /* not used */) { |
| PermissionCollection perms |
| = SecureClassLoader.this.getPermissions(cs); |
| ProtectionDomain pd = new ProtectionDomain( |
| cs, perms, SecureClassLoader.this, null); |
| if (DebugHolder.debug != null) { |
| DebugHolder.debug.println(" getPermissions " + pd); |
| DebugHolder.debug.println(""); |
| } |
| return pd; |
| } |
| }); |
| } |
| |
| /* |
| * Check to make sure the class loader has been initialized. |
| */ |
| private void check() { |
| if (!initialized) { |
| throw new SecurityException("ClassLoader object not initialized"); |
| } |
| } |
| |
| private static class CodeSourceKey { |
| private final CodeSource cs; |
| |
| CodeSourceKey(CodeSource cs) { |
| this.cs = cs; |
| } |
| |
| @Override |
| public int hashCode() { |
| String locationNoFrag = cs.getLocationNoFragString(); |
| return locationNoFrag != null ? locationNoFrag.hashCode() : 0; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| |
| if (!(obj instanceof CodeSourceKey)) { |
| return false; |
| } |
| |
| CodeSourceKey csk = (CodeSourceKey) obj; |
| |
| if (!Objects.equals(cs.getLocationNoFragString(), |
| csk.cs.getLocationNoFragString())) { |
| return false; |
| } |
| |
| return cs.matchCerts(csk.cs, true); |
| } |
| } |
| } |