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    1   /*
    2    * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package java.security;
   27   
   28   import java.security;
   29   import java.util.Enumeration;
   30   import java.util.Hashtable;
   31   import java.util.StringTokenizer;
   32   import sun.security.util.SecurityConstants;
   33   
   34   /**
   35    * The AllPermission is a permission that implies all other permissions.
   36    * <p>
   37    * <b>Note:</b> Granting AllPermission should be done with extreme care,
   38    * as it implies all other permissions. Thus, it grants code the ability
   39    * to run with security
   40    * disabled.  Extreme caution should be taken before granting such
   41    * a permission to code.  This permission should be used only during testing,
   42    * or in extremely rare cases where an application or applet is
   43    * completely trusted and adding the necessary permissions to the policy
   44    * is prohibitively cumbersome.
   45    *
   46    * @see java.security.Permission
   47    * @see java.security.AccessController
   48    * @see java.security.Permissions
   49    * @see java.security.PermissionCollection
   50    * @see java.lang.SecurityManager
   51    *
   52    *
   53    * @author Roland Schemers
   54    *
   55    * @serial exclude
   56    */
   57   
   58   public final class AllPermission extends Permission {
   59   
   60       private static final long serialVersionUID = -2916474571451318075L;
   61   
   62       /**
   63        * Creates a new AllPermission object.
   64        */
   65   
   66       public AllPermission()
   67       {
   68           super("<all permissions>");
   69       }
   70   
   71   
   72       /**
   73        * Creates a new AllPermission object. This
   74        * constructor exists for use by the <code>Policy</code> object
   75        * to instantiate new Permission objects.
   76        *
   77        * @param name ignored
   78        * @param actions ignored.
   79        */
   80       public AllPermission(String name, String actions)
   81       {
   82           this();
   83       }
   84   
   85       /**
   86        * Checks if the specified permission is "implied" by
   87        * this object. This method always returns true.
   88        *
   89        * @param p the permission to check against.
   90        *
   91        * @return return
   92        */
   93       public boolean implies(Permission p) {
   94            return true;
   95       }
   96   
   97       /**
   98        * Checks two AllPermission objects for equality. Two AllPermission
   99        * objects are always equal.
  100        *
  101        * @param obj the object we are testing for equality with this object.
  102        * @return true if <i>obj</i> is an AllPermission, false otherwise.
  103        */
  104       public boolean equals(Object obj) {
  105           return (obj instanceof AllPermission);
  106       }
  107   
  108       /**
  109        * Returns the hash code value for this object.
  110        *
  111        * @return a hash code value for this object.
  112        */
  113   
  114       public int hashCode() {
  115           return 1;
  116       }
  117   
  118       /**
  119        * Returns the canonical string representation of the actions.
  120        *
  121        * @return the actions.
  122        */
  123       public String getActions()
  124       {
  125           return "<all actions>";
  126       }
  127   
  128       /**
  129        * Returns a new PermissionCollection object for storing AllPermission
  130        * objects.
  131        * <p>
  132        *
  133        * @return a new PermissionCollection object suitable for
  134        * storing AllPermissions.
  135        */
  136   
  137       public PermissionCollection newPermissionCollection() {
  138           return new AllPermissionCollection();
  139       }
  140   
  141   }
  142   
  143   /**
  144    * A AllPermissionCollection stores a collection
  145    * of AllPermission permissions. AllPermission objects
  146    * must be stored in a manner that allows them to be inserted in any
  147    * order, but enable the implies function to evaluate the implies
  148    * method in an efficient (and consistent) manner.
  149    *
  150    * @see java.security.Permission
  151    * @see java.security.Permissions
  152    *
  153    *
  154    * @author Roland Schemers
  155    *
  156    * @serial include
  157    */
  158   
  159   final class AllPermissionCollection
  160   extends PermissionCollection
  161   implements java.io.Serializable
  162   {
  163   
  164       // use serialVersionUID from JDK 1.2.2 for interoperability
  165       private static final long serialVersionUID = -4023755556366636806L;
  166   
  167       private boolean all_allowed; // true if any all permissions have been added
  168   
  169       /**
  170        * Create an empty AllPermissions object.
  171        *
  172        */
  173   
  174       public AllPermissionCollection() {
  175           all_allowed = false;
  176       }
  177   
  178       /**
  179        * Adds a permission to the AllPermissions. The key for the hash is
  180        * permission.path.
  181        *
  182        * @param permission the Permission object to add.
  183        *
  184        * @exception IllegalArgumentException - if the permission is not a
  185        *                                       AllPermission
  186        *
  187        * @exception SecurityException - if this AllPermissionCollection object
  188        *                                has been marked readonly
  189        */
  190   
  191       public void add(Permission permission)
  192       {
  193           if (! (permission instanceof AllPermission))
  194               throw new IllegalArgumentException("invalid permission: "+
  195                                                  permission);
  196           if (isReadOnly())
  197               throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");
  198   
  199           all_allowed = true; // No sync; staleness OK
  200       }
  201   
  202       /**
  203        * Check and see if this set of permissions implies the permissions
  204        * expressed in "permission".
  205        *
  206        * @param p the Permission object to compare
  207        *
  208        * @return always returns true.
  209        */
  210   
  211       public boolean implies(Permission permission)
  212       {
  213           return all_allowed; // No sync; staleness OK
  214       }
  215   
  216       /**
  217        * Returns an enumeration of all the AllPermission objects in the
  218        * container.
  219        *
  220        * @return an enumeration of all the AllPermission objects.
  221        */
  222       public Enumeration<Permission> elements()
  223       {
  224           return new Enumeration<Permission>() {
  225               private boolean hasMore = all_allowed;
  226   
  227               public boolean hasMoreElements() {
  228                   return hasMore;
  229               }
  230   
  231               public Permission nextElement() {
  232                   hasMore = false;
  233                   return SecurityConstants.ALL_PERMISSION;
  234               }
  235           };
  236       }
  237   }

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