/* * Copyright (c) 1997, 2011, 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.HashMap;import java.util.ArrayList;import java.net.URL; 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 */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; // HashMap that maps CodeSource to ProtectionDomain // @GuardedBy("pdcache") private final HashMap<CodeSource, ProtectionDomain> pdcache = new HashMap<>(11); private static final Debug debug = Debug.getInstance("scl"); 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</code> * method to ensure creation of a class loader is allowed. * <p> * @param parent the parent ClassLoader * @exception SecurityException if a security manager exists and its * <code>checkCreateClassLoader</code> 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</code> * method to ensure creation of a class loader is allowed. * * @exception SecurityException if a security manager exists and its * <code>checkCreateClassLoader</code> 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; } /** * 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. * <p> * @param name the expected name of the class, or <code>null</code> * 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</code> through <code>off+len-1</code> * 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</code> of the class data * @param len the length of the class data * @param cs the associated CodeSource, or <code>null</code> if none * @return the <code>Class</code> 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</code> or * <code>len</code> is negative, or if * <code>off+len</code> is greater than <code>b.length</code>. * * @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 <tt>ByteBuffer</tt>} * into an instance of class <tt>Class</tt>, 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. * <p> * @param name the expected name of the class, or <code>null</code> * 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 * <tt>b.position()</tt> through <tt>b.position() + b.limit() -1</tt> * 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</code> if none * @return the <code>Class</code> 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. * <p> * @param codesource the codesource. * * @return the permissions granted to the codesource. * */ protected PermissionCollection getPermissions(CodeSource codesource) { check(); return new Permissions(); // ProtectionDomain defers the binding } /* * Returned cached ProtectionDomain for the specified CodeSource. */ private ProtectionDomain getProtectionDomain(CodeSource cs) { if (cs == null) return null; ProtectionDomain pd = null; synchronized (pdcache) { pd = pdcache.get(cs); if (pd == null) { PermissionCollection perms = getPermissions(cs); pd = new ProtectionDomain(cs, perms, this, null); pdcache.put(cs, pd); if (debug != null) { debug.println(" getPermissions "+ pd); 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"); } } }
/*
* Copyright (c) 1997, 2011, 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.HashMap;
import java.util.ArrayList;
import java.net.URL;
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
*/
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;
// HashMap that maps CodeSource to ProtectionDomain
// @GuardedBy("pdcache")
private final HashMap<CodeSource, ProtectionDomain> pdcache =
new HashMap<>(11);
private static final Debug debug = Debug.getInstance("scl");
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</code>
* method to ensure creation of a class loader is allowed.
* <p>
* @param parent the parent ClassLoader
* @exception SecurityException if a security manager exists and its
* <code>checkCreateClassLoader</code> 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</code>
* method to ensure creation of a class loader is allowed.
*
* @exception SecurityException if a security manager exists and its
* <code>checkCreateClassLoader</code> 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;
}
/**
* 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.
* <p>
* @param name the expected name of the class, or <code>null</code>
* 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</code> through <code>off+len-1</code>
* 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</code> of the class data
* @param len the length of the class data
* @param cs the associated CodeSource, or <code>null</code> if none
* @return the <code>Class</code> 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</code> or
* <code>len</code> is negative, or if
* <code>off+len</code> is greater than <code>b.length</code>.
*
* @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 <tt>ByteBuffer</tt>}
* into an instance of class <tt>Class</tt>, 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.
* <p>
* @param name the expected name of the class, or <code>null</code>
* 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
* <tt>b.position()</tt> through <tt>b.position() + b.limit() -1</tt>
* 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</code> if none
* @return the <code>Class</code> 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.
* <p>
* @param codesource the codesource.
*
* @return the permissions granted to the codesource.
*
*/
protected PermissionCollection getPermissions(CodeSource codesource)
{
check();
return new Permissions(); // ProtectionDomain defers the binding
}
/*
* Returned cached ProtectionDomain for the specified CodeSource.
*/
private ProtectionDomain getProtectionDomain(CodeSource cs) {
if (cs == null)
return null;
ProtectionDomain pd = null;
synchronized (pdcache) {
pd = pdcache.get(cs);
if (pd == null) {
PermissionCollection perms = getPermissions(cs);
pd = new ProtectionDomain(cs, perms, this, null);
pdcache.put(cs, pd);
if (debug != null) {
debug.println(" getPermissions "+ pd);
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");
}
}
}