108 lines
3.6 KiB
Java
108 lines
3.6 KiB
Java
/* SecureClassLoader.java --- A Secure Class Loader
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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/**
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A Secure Class Loader for loading classes with additional
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support for specifying code source and permissions when
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they are retrieved by the system policy handler.
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@since JDK 1.2
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@author Mark Benvenuto
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*/
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public class SecureClassLoader extends ClassLoader
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{
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protected SecureClassLoader(ClassLoader parent)
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{
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super(parent);
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// FIXME: What else?
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}
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protected SecureClassLoader()
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{
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// FIXME: What do we need to do here?
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}
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/**
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Creates a class using an array of bytes and a
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CodeSource.
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@param name the name to give the class. null if unknown.
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@param b the data representing the classfile, in classfile format.
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@param off the offset into the data where the classfile starts.
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@param len the length of the classfile data in the array.
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@param cs the CodeSource for the class
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@return the class that was defined and optional CodeSource.
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@exception ClassFormatError if the byte array is not in proper classfile format.
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*/
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protected final Class defineClass(String name, byte[] b, int off, int len,
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CodeSource cs)
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{
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// FIXME: Need to cache ProtectionDomains according to 1.3 docs.
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ProtectionDomain protectionDomain =
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new ProtectionDomain(cs, getPermissions(cs));
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try
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{
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return super.defineClass(name, b, off, len, protectionDomain);
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}
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catch (ClassFormatError cfe)
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{
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return null;
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}
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}
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/**
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Returns a PermissionCollection for the specified CodeSource.
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The default implmentation invokes
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java.security.Policy.getPermissions.
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This method is called by defineClass that takes a CodeSource
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arguement to build a proper ProtectionDomain for the class
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being defined.
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*/
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protected PermissionCollection getPermissions(CodeSource cs)
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{
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Policy policy = Policy.getPolicy();
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return policy.getPermissions(cs);
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}
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}
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