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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.security;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.NoSuchElementException;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.Collections;
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import java.io.Serializable;
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import java.io.ObjectStreamField;
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import java.io.ObjectOutputStream;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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/**
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* This class represents a heterogeneous collection of Permissions. That is,
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* it contains different types of Permission objects, organized into
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* PermissionCollections. For example, if any
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* <code>java.io.FilePermission</code> objects are added to an instance of
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* this class, they are all stored in a single
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* PermissionCollection. It is the PermissionCollection returned by a call to
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* the <code>newPermissionCollection</code> method in the FilePermission class.
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* Similarly, any <code>java.lang.RuntimePermission</code> objects are
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* stored in the PermissionCollection returned by a call to the
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* <code>newPermissionCollection</code> method in the
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* RuntimePermission class. Thus, this class represents a collection of
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* PermissionCollections.
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*
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* <p>When the <code>add</code> method is called to add a Permission, the
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* Permission is stored in the appropriate PermissionCollection. If no such
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* collection exists yet, the Permission object's class is determined and the
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* <code>newPermissionCollection</code> method is called on that class to create
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* the PermissionCollection and add it to the Permissions object. If
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* <code>newPermissionCollection</code> returns null, then a default
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* PermissionCollection that uses a hashtable will be created and used. Each
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* hashtable entry stores a Permission object as both the key and the value.
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*
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* <p> Enumerations returned via the <code>elements</code> method are
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* not <em>fail-fast</em>. Modifications to a collection should not be
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* performed while enumerating over that collection.
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*
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* @see Permission
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* @see PermissionCollection
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* @see AllPermission
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*
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*
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* @author Marianne Mueller
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* @author Roland Schemers
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*
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* @serial exclude
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*/
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public final class Permissions extends PermissionCollection
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implements Serializable
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{
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/**
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* Key is permissions Class, value is PermissionCollection for that class.
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* Not serialized; see serialization section at end of class.
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*/
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private transient Map<Class<?>, PermissionCollection> permsMap;
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// optimization. keep track of whether unresolved permissions need to be
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// checked
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private transient boolean hasUnresolved = false;
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// optimization. keep track of the AllPermission collection
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// - package private for ProtectionDomain optimization
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PermissionCollection allPermission;
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/**
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* Creates a new Permissions object containing no PermissionCollections.
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*/
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public Permissions() {
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permsMap = new HashMap<Class<?>, PermissionCollection>(11);
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allPermission = null;
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}
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/**
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* Adds a permission object to the PermissionCollection for the class the
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* permission belongs to. For example, if <i>permission</i> is a
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* FilePermission, it is added to the FilePermissionCollection stored
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* in this Permissions object.
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*
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* This method creates
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* a new PermissionCollection object (and adds the permission to it)
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* if an appropriate collection does not yet exist. <p>
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*
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* @param permission the Permission object to add.
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*
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* @exception SecurityException if this Permissions object is
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* marked as readonly.
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*
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* @see PermissionCollection#isReadOnly()
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*/
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public void add(Permission permission) {
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if (isReadOnly())
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throw new SecurityException(
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"attempt to add a Permission to a readonly Permissions object");
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PermissionCollection pc;
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synchronized (this) {
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pc = getPermissionCollection(permission, true);
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pc.add(permission);
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}
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// No sync; staleness -> optimizations delayed, which is OK
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if (permission instanceof AllPermission) {
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allPermission = pc;
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}
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if (permission instanceof UnresolvedPermission) {
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hasUnresolved = true;
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}
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}
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/**
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* Checks to see if this object's PermissionCollection for permissions of
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* the specified permission's class implies the permissions
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* expressed in the <i>permission</i> object. Returns true if the
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* combination of permissions in the appropriate PermissionCollection
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* (e.g., a FilePermissionCollection for a FilePermission) together
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* imply the specified permission.
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*
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* <p>For example, suppose there is a FilePermissionCollection in this
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* Permissions object, and it contains one FilePermission that specifies
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* "read" access for all files in all subdirectories of the "/tmp"
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* directory, and another FilePermission that specifies "write" access
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* for all files in the "/tmp/scratch/foo" directory.
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* Then if the <code>implies</code> method
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* is called with a permission specifying both "read" and "write" access
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* to files in the "/tmp/scratch/foo" directory, <code>true</code> is
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* returned.
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*
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* <p>Additionally, if this PermissionCollection contains the
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* AllPermission, this method will always return true.
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* <p>
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* @param permission the Permission object to check.
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*
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* @return true if "permission" is implied by the permissions in the
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* PermissionCollection it
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* belongs to, false if not.
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*/
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public boolean implies(Permission permission) {
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// No sync; staleness -> skip optimization, which is OK
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if (allPermission != null) {
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return true; // AllPermission has already been added
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} else {
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synchronized (this) {
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PermissionCollection pc = getPermissionCollection(permission,
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false);
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if (pc != null) {
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return pc.implies(permission);
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} else {
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// none found
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return false;
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}
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}
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}
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}
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/**
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* Returns an enumeration of all the Permission objects in all the
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* PermissionCollections in this Permissions object.
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*
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* @return an enumeration of all the Permissions.
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*/
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public Enumeration<Permission> elements() {
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// go through each Permissions in the hash table
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// and call their elements() function.
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synchronized (this) {
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return new PermissionsEnumerator(permsMap.values().iterator());
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}
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}
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/**
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* Gets the PermissionCollection in this Permissions object for
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* permissions whose type is the same as that of <i>p</i>.
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* For example, if <i>p</i> is a FilePermission,
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* the FilePermissionCollection
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* stored in this Permissions object will be returned.
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*
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* If createEmpty is true,
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* this method creates a new PermissionCollection object for the specified
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* type of permission objects if one does not yet exist.
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* To do so, it first calls the <code>newPermissionCollection</code> method
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* on <i>p</i>. Subclasses of class Permission
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* override that method if they need to store their permissions in a
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* particular PermissionCollection object in order to provide the
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* correct semantics when the <code>PermissionCollection.implies</code>
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* method is called.
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* If the call returns a PermissionCollection, that collection is stored
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* in this Permissions object. If the call returns null and createEmpty
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* is true, then
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* this method instantiates and stores a default PermissionCollection
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* that uses a hashtable to store its permission objects.
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*
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* createEmpty is ignored when creating empty PermissionCollection
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* for unresolved permissions because of the overhead of determining the
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* PermissionCollection to use.
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*
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* createEmpty should be set to false when this method is invoked from
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* implies() because it incurs the additional overhead of creating and
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* adding an empty PermissionCollection that will just return false.
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* It should be set to true when invoked from add().
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*/
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private PermissionCollection getPermissionCollection(Permission p,
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boolean createEmpty) {
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Class c = p.getClass();
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PermissionCollection pc = permsMap.get(c);
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if (!hasUnresolved && !createEmpty) {
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return pc;
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} else if (pc == null) {
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// Check for unresolved permissions
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pc = (hasUnresolved ? getUnresolvedPermissions(p) : null);
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// if still null, create a new collection
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if (pc == null && createEmpty) {
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pc = p.newPermissionCollection();
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// still no PermissionCollection?
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// We'll give them a PermissionsHash.
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if (pc == null)
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pc = new PermissionsHash();
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}
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if (pc != null) {
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permsMap.put(c, pc);
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}
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}
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return pc;
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}
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/**
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* Resolves any unresolved permissions of type p.
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*
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* @param p the type of unresolved permission to resolve
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*
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* @return PermissionCollection containing the unresolved permissions,
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* or null if there were no unresolved permissions of type p.
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*
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*/
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private PermissionCollection getUnresolvedPermissions(Permission p)
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{
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// Called from within synchronized method so permsMap doesn't need lock
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UnresolvedPermissionCollection uc =
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(UnresolvedPermissionCollection) permsMap.get(UnresolvedPermission.class);
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// we have no unresolved permissions if uc is null
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if (uc == null)
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return null;
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List<UnresolvedPermission> unresolvedPerms =
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uc.getUnresolvedPermissions(p);
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// we have no unresolved permissions of this type if unresolvedPerms is null
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if (unresolvedPerms == null)
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return null;
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java.security.cert.Certificate certs[] = null;
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Object signers[] = p.getClass().getSigners();
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int n = 0;
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if (signers != null) {
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for (int j=0; j < signers.length; j++) {
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if (signers[j] instanceof java.security.cert.Certificate) {
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n++;
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}
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}
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certs = new java.security.cert.Certificate[n];
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n = 0;
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for (int j=0; j < signers.length; j++) {
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if (signers[j] instanceof java.security.cert.Certificate) {
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certs[n++] = (java.security.cert.Certificate)signers[j];
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}
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}
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}
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PermissionCollection pc = null;
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synchronized (unresolvedPerms) {
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int len = unresolvedPerms.size();
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for (int i = 0; i < len; i++) {
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UnresolvedPermission up = unresolvedPerms.get(i);
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Permission perm = up.resolve(p, certs);
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if (perm != null) {
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if (pc == null) {
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pc = p.newPermissionCollection();
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if (pc == null)
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pc = new PermissionsHash();
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}
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pc.add(perm);
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}
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}
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}
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return pc;
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}
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private static final long serialVersionUID = 4858622370623524688L;
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// Need to maintain serialization interoperability with earlier releases,
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// which had the serializable field:
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// private Hashtable perms;
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/**
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* @serialField perms java.util.Hashtable
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* A table of the Permission classes and PermissionCollections.
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* @serialField allPermission java.security.PermissionCollection
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*/
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private static final ObjectStreamField[] serialPersistentFields = {
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new ObjectStreamField("perms", Hashtable.class),
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new ObjectStreamField("allPermission", PermissionCollection.class),
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};
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/**
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* @serialData Default fields.
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*/
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/*
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* Writes the contents of the permsMap field out as a Hashtable for
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* serialization compatibility with earlier releases. allPermission
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* unchanged.
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*/
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private void writeObject(ObjectOutputStream out) throws IOException {
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// Don't call out.defaultWriteObject()
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// Copy perms into a Hashtable
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Hashtable<Class<?>, PermissionCollection> perms =
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new Hashtable<Class<?>, PermissionCollection>(permsMap.size()*2); // no sync; estimate
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synchronized (this) {
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perms.putAll(permsMap);
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}
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// Write out serializable fields
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ObjectOutputStream.PutField pfields = out.putFields();
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pfields.put("allPermission", allPermission); // no sync; staleness OK
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pfields.put("perms", perms);
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out.writeFields();
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}
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/*
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* Reads in a Hashtable of Class/PermissionCollections and saves them in the
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* permsMap field. Reads in allPermission.
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*/
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private void readObject(ObjectInputStream in) throws IOException,
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ClassNotFoundException {
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// Don't call defaultReadObject()
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// Read in serialized fields
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ObjectInputStream.GetField gfields = in.readFields();
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// Get allPermission
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allPermission = (PermissionCollection) gfields.get("allPermission", null);
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// Get permissions
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Hashtable<Class<?>, PermissionCollection> perms =
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(Hashtable<Class<?>, PermissionCollection>)gfields.get("perms", null);
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permsMap = new HashMap<Class<?>, PermissionCollection>(perms.size()*2);
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permsMap.putAll(perms);
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// Set hasUnresolved
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UnresolvedPermissionCollection uc =
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(UnresolvedPermissionCollection) permsMap.get(UnresolvedPermission.class);
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hasUnresolved = (uc != null && uc.elements().hasMoreElements());
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}
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}
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final class PermissionsEnumerator implements Enumeration<Permission> {
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// all the perms
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private Iterator<PermissionCollection> perms;
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// the current set
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private Enumeration<Permission> permset;
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PermissionsEnumerator(Iterator<PermissionCollection> e) {
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perms = e;
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permset = getNextEnumWithMore();
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}
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// No need to synchronize; caller should sync on object as required
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public boolean hasMoreElements() {
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// if we enter with permissionimpl null, we know
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// there are no more left.
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if (permset == null)
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return false;
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// try to see if there are any left in the current one
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if (permset.hasMoreElements())
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return true;
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|
430 |
// get the next one that has something in it...
|
|
431 |
permset = getNextEnumWithMore();
|
|
432 |
|
|
433 |
// if it is null, we are done!
|
|
434 |
return (permset != null);
|
|
435 |
}
|
|
436 |
|
|
437 |
// No need to synchronize; caller should sync on object as required
|
|
438 |
public Permission nextElement() {
|
|
439 |
|
|
440 |
// hasMoreElements will update permset to the next permset
|
|
441 |
// with something in it...
|
|
442 |
|
|
443 |
if (hasMoreElements()) {
|
|
444 |
return permset.nextElement();
|
|
445 |
} else {
|
|
446 |
throw new NoSuchElementException("PermissionsEnumerator");
|
|
447 |
}
|
|
448 |
|
|
449 |
}
|
|
450 |
|
|
451 |
private Enumeration<Permission> getNextEnumWithMore() {
|
|
452 |
while (perms.hasNext()) {
|
|
453 |
PermissionCollection pc = perms.next();
|
|
454 |
Enumeration<Permission> next =pc.elements();
|
|
455 |
if (next.hasMoreElements())
|
|
456 |
return next;
|
|
457 |
}
|
|
458 |
return null;
|
|
459 |
|
|
460 |
}
|
|
461 |
}
|
|
462 |
|
|
463 |
/**
|
|
464 |
* A PermissionsHash stores a homogeneous set of permissions in a hashtable.
|
|
465 |
*
|
|
466 |
* @see Permission
|
|
467 |
* @see Permissions
|
|
468 |
*
|
|
469 |
*
|
|
470 |
* @author Roland Schemers
|
|
471 |
*
|
|
472 |
* @serial include
|
|
473 |
*/
|
|
474 |
|
|
475 |
final class PermissionsHash extends PermissionCollection
|
|
476 |
implements Serializable
|
|
477 |
{
|
|
478 |
/**
|
|
479 |
* Key and value are (same) permissions objects.
|
|
480 |
* Not serialized; see serialization section at end of class.
|
|
481 |
*/
|
|
482 |
private transient Map<Permission, Permission> permsMap;
|
|
483 |
|
|
484 |
/**
|
|
485 |
* Create an empty PermissionsHash object.
|
|
486 |
*/
|
|
487 |
|
|
488 |
PermissionsHash() {
|
|
489 |
permsMap = new HashMap<Permission, Permission>(11);
|
|
490 |
}
|
|
491 |
|
|
492 |
/**
|
|
493 |
* Adds a permission to the PermissionsHash.
|
|
494 |
*
|
|
495 |
* @param permission the Permission object to add.
|
|
496 |
*/
|
|
497 |
|
|
498 |
public void add(Permission permission) {
|
|
499 |
synchronized (this) {
|
|
500 |
permsMap.put(permission, permission);
|
|
501 |
}
|
|
502 |
}
|
|
503 |
|
|
504 |
/**
|
|
505 |
* Check and see if this set of permissions implies the permissions
|
|
506 |
* expressed in "permission".
|
|
507 |
*
|
|
508 |
* @param permission the Permission object to compare
|
|
509 |
*
|
|
510 |
* @return true if "permission" is a proper subset of a permission in
|
|
511 |
* the set, false if not.
|
|
512 |
*/
|
|
513 |
|
|
514 |
public boolean implies(Permission permission) {
|
|
515 |
// attempt a fast lookup and implies. If that fails
|
|
516 |
// then enumerate through all the permissions.
|
|
517 |
synchronized (this) {
|
|
518 |
Permission p = permsMap.get(permission);
|
|
519 |
|
|
520 |
// If permission is found, then p.equals(permission)
|
|
521 |
if (p == null) {
|
|
522 |
for (Permission p_ : permsMap.values()) {
|
|
523 |
if (p_.implies(permission))
|
|
524 |
return true;
|
|
525 |
}
|
|
526 |
return false;
|
|
527 |
} else {
|
|
528 |
return true;
|
|
529 |
}
|
|
530 |
}
|
|
531 |
}
|
|
532 |
|
|
533 |
/**
|
|
534 |
* Returns an enumeration of all the Permission objects in the container.
|
|
535 |
*
|
|
536 |
* @return an enumeration of all the Permissions.
|
|
537 |
*/
|
|
538 |
|
|
539 |
public Enumeration<Permission> elements() {
|
|
540 |
// Convert Iterator of Map values into an Enumeration
|
|
541 |
synchronized (this) {
|
|
542 |
return Collections.enumeration(permsMap.values());
|
|
543 |
}
|
|
544 |
}
|
|
545 |
|
|
546 |
private static final long serialVersionUID = -8491988220802933440L;
|
|
547 |
// Need to maintain serialization interoperability with earlier releases,
|
|
548 |
// which had the serializable field:
|
|
549 |
// private Hashtable perms;
|
|
550 |
/**
|
|
551 |
* @serialField perms java.util.Hashtable
|
|
552 |
* A table of the Permissions (both key and value are same).
|
|
553 |
*/
|
|
554 |
private static final ObjectStreamField[] serialPersistentFields = {
|
|
555 |
new ObjectStreamField("perms", Hashtable.class),
|
|
556 |
};
|
|
557 |
|
|
558 |
/**
|
|
559 |
* @serialData Default fields.
|
|
560 |
*/
|
|
561 |
/*
|
|
562 |
* Writes the contents of the permsMap field out as a Hashtable for
|
|
563 |
* serialization compatibility with earlier releases.
|
|
564 |
*/
|
|
565 |
private void writeObject(ObjectOutputStream out) throws IOException {
|
|
566 |
// Don't call out.defaultWriteObject()
|
|
567 |
|
|
568 |
// Copy perms into a Hashtable
|
|
569 |
Hashtable<Permission, Permission> perms =
|
|
570 |
new Hashtable<Permission, Permission>(permsMap.size()*2);
|
|
571 |
synchronized (this) {
|
|
572 |
perms.putAll(permsMap);
|
|
573 |
}
|
|
574 |
|
|
575 |
// Write out serializable fields
|
|
576 |
ObjectOutputStream.PutField pfields = out.putFields();
|
|
577 |
pfields.put("perms", perms);
|
|
578 |
out.writeFields();
|
|
579 |
}
|
|
580 |
|
|
581 |
/*
|
|
582 |
* Reads in a Hashtable of Permission/Permission and saves them in the
|
|
583 |
* permsMap field.
|
|
584 |
*/
|
|
585 |
private void readObject(ObjectInputStream in) throws IOException,
|
|
586 |
ClassNotFoundException {
|
|
587 |
// Don't call defaultReadObject()
|
|
588 |
|
|
589 |
// Read in serialized fields
|
|
590 |
ObjectInputStream.GetField gfields = in.readFields();
|
|
591 |
|
|
592 |
// Get permissions
|
|
593 |
Hashtable<Permission, Permission> perms =
|
|
594 |
(Hashtable<Permission, Permission>)gfields.get("perms", null);
|
|
595 |
permsMap = new HashMap<Permission, Permission>(perms.size()*2);
|
|
596 |
permsMap.putAll(perms);
|
|
597 |
}
|
|
598 |
}
|