ojluni/src/main/java/java/security/SecureClassLoader.java - platform/libcore.git - Git at Google

 /*
  * 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&trade; 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&trade; 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");
	}
	}

	}