/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
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* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
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* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
import java.lang.ref.SoftReference;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessController;
import java.security.CodeSource;
import java.security.Policy;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.SecureClassLoader;
import java.util.Map;
import java.util.WeakHashMap;
import org.mozilla.classfile.ByteCode;
import org.mozilla.classfile.ClassFileWriter;
/**
* A security controller relying on Java {@link Policy} in effect. When you use
* this security controller, your securityDomain objects must be instances of
* {@link CodeSource} representing the location from where you load your
* scripts. Any Java policy "grant" statements matching the URL and certificate
* in code sources will apply to the scripts. If you specify any certificates
* within your {@link CodeSource} objects, it is your responsibility to verify
* (or not) that the script source files are signed in whatever
* implementation-specific way you're using.
* @author Attila Szegedi
*/
public class PolicySecurityController extends SecurityController
{
private static final byte[] secureCallerImplBytecode = loadBytecode();
// We're storing a CodeSource -> (ClassLoader -> SecureRenderer), since we
// need to have one renderer per class loader. We're using weak hash maps
// and soft references all the way, since we don't want to interfere with
// cleanup of either CodeSource or ClassLoader objects.
private static final Map callers = new WeakHashMap();
public Class getStaticSecurityDomainClassInternal() {
return CodeSource.class;
}
private static class Loader extends SecureClassLoader
implements GeneratedClassLoader
{
private final CodeSource codeSource;
Loader(ClassLoader parent, CodeSource codeSource)
{
super(parent);
this.codeSource = codeSource;
}
public Class defineClass(String name, byte[] data)
{
return defineClass(name, data, 0, data.length, codeSource);
}
public void linkClass(Class cl)
{
resolveClass(cl);
}
}
public GeneratedClassLoader createClassLoader(final ClassLoader parent,
final Object securityDomain)
{
return (Loader)AccessController.doPrivileged(
new PrivilegedAction()
{
public Object run()
{
return new Loader(parent, (CodeSource)securityDomain);
}
});
}
public Object getDynamicSecurityDomain(Object securityDomain)
{
// No separate notion of dynamic security domain - just return what was
// passed in.
return securityDomain;
}
public Object callWithDomain(final Object securityDomain, final Context cx,
Callable callable, Scriptable scope, Scriptable thisObj,
Object[] args)
{
// Run in doPrivileged as we might be checked for "getClassLoader"
// runtime permission
final ClassLoader classLoader = (ClassLoader)AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
return cx.getApplicationClassLoader();
}
});
final CodeSource codeSource = (CodeSource)securityDomain;
Map classLoaderMap;
synchronized(callers)
{
classLoaderMap = (Map)callers.get(codeSource);
if(classLoaderMap == null)
{
classLoaderMap = new WeakHashMap();
callers.put(codeSource, classLoaderMap);
}
}
SecureCaller caller;
synchronized(classLoaderMap)
{
SoftReference ref = (SoftReference)classLoaderMap.get(classLoader);
if(ref != null)
{
caller = (SecureCaller)ref.get();
}
else
{
caller = null;
}
if(caller == null)
{
try
{
// Run in doPrivileged as we'll be checked for
// "createClassLoader" runtime permission
caller = (SecureCaller)AccessController.doPrivileged(
new PrivilegedExceptionAction()
{
public Object run() throws Exception
{
Loader loader = new Loader(classLoader,
codeSource);
Class c = loader.defineClass(
SecureCaller.class.getName() + "Impl",
secureCallerImplBytecode);
return c.newInstance();
}
});
classLoaderMap.put(classLoader, new SoftReference(caller));
}
catch(PrivilegedActionException ex)
{
throw new UndeclaredThrowableException(ex.getCause());
}
}
}
return caller.call(callable, cx, scope, thisObj, args);
}
public abstract static class SecureCaller
{
public abstract Object call(Callable callable, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args);
}
private static byte[] loadBytecode()
{
String secureCallerClassName = SecureCaller.class.getName();
ClassFileWriter cfw = new ClassFileWriter(
secureCallerClassName + "Impl", secureCallerClassName,
"<generated>");
cfw.startMethod("<init>", "()V", ClassFileWriter.ACC_PUBLIC);
cfw.addALoad(0);
cfw.addInvoke(ByteCode.INVOKESPECIAL, secureCallerClassName,
"<init>", "()V");
cfw.add(ByteCode.RETURN);
cfw.stopMethod((short)1);
String callableCallSig =
"Lorg/mozilla/javascript/Context;" +
"Lorg/mozilla/javascript/Scriptable;" +
"Lorg/mozilla/javascript/Scriptable;" +
"[Ljava/lang/Object;)Ljava/lang/Object;";
cfw.startMethod("call",
"(Lorg/mozilla/javascript/Callable;" + callableCallSig,
(short)(ClassFileWriter.ACC_PUBLIC
| ClassFileWriter.ACC_FINAL));
for(int i = 1; i < 6; ++i) {
cfw.addALoad(i);
}
cfw.addInvoke(ByteCode.INVOKEINTERFACE,
"org/mozilla/javascript/Callable", "call",
"(" + callableCallSig);
cfw.add(ByteCode.ARETURN);
cfw.stopMethod((short)6);
return cfw.toByteArray();
}
}