1 /*
2 * Copyright (c) 1997, 2017, 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.awt;
27
28 import java.security.BasicPermission;
29
30 /**
31 * This class is for AWT permissions.
32 * An {@code AWTPermission} contains a target name but
33 * no actions list; you either have the named permission
34 * or you don't.
35 *
36 * <P>
37 * The target name is the name of the AWT permission (see below). The naming
38 * convention follows the hierarchical property naming convention.
39 * Also, an asterisk could be used to represent all AWT permissions.
40 *
41 * <P>
42 * The following table lists all the possible {@code AWTPermission}
43 * target names, and for each provides a description of what the
44 * permission allows and a discussion of the risks of granting code
45 * the permission.
46 *
47 * <table class="striped">
48 * <caption>AWTPermission target names, descriptions, and associated risks
49 * </caption>
50 * <thead>
51 * <tr>
52 * <th scope="col">Permission Target Name
53 * <th scope="col">What the Permission Allows
54 * <th scope="col">Risks of Allowing this Permission
55 * </thead>
56 * <tbody>
57 * <tr>
58 * <th scope="row">accessClipboard
59 * <td>Posting and retrieval of information to and from the AWT clipboard
60 * <td>This would allow malfeasant code to share potentially sensitive or
61 * confidential information.
62 * <tr>
63 * <th scope="row">accessEventQueue
64 * <td>Access to the AWT event queue
65 * <td>After retrieving the AWT event queue, malicious code may peek at and
66 * even remove existing events from its event queue, as well as post bogus
67 * events which may purposefully cause the application or applet to
68 * misbehave in an insecure manner.
69 * <tr>
70 * <th scope="row">accessSystemTray
71 * <td>Access to the AWT SystemTray instance
72 * <td>This would allow malicious code to add tray icons to the system tray.
73 * First, such an icon may look like the icon of some known application
74 * (such as a firewall or anti-virus) and order a user to do something
75 * unsafe (with help of balloon messages). Second, the system tray may be
76 * glutted with tray icons so that no one could add a tray icon anymore.
77 * <tr>
78 * <th scope="row">createRobot
79 * <td>Create java.awt.Robot objects
80 * <td>The java.awt.Robot object allows code to generate native-level mouse
81 * and keyboard events as well as read the screen. It could allow malicious
82 * code to control the system, run other programs, read the display, and
83 * deny mouse and keyboard access to the user.
84 * <tr>
85 * <th scope="row">fullScreenExclusive
86 * <td>Enter full-screen exclusive mode
87 * <td>Entering full-screen exclusive mode allows direct access to low-level
88 * graphics card memory. This could be used to spoof the system, since the
89 * program is in direct control of rendering. Depending on the
90 * implementation, the security warning may not be shown for the windows
91 * used to enter the full-screen exclusive mode (assuming that the
92 * {@code fullScreenExclusive} permission has been granted to this
93 * application). Note that this behavior does not mean that the
94 * {@code showWindowWithoutWarningBanner} permission will be automatically
95 * granted to the application which has the {@code fullScreenExclusive}
96 * permission: non-full-screen windows will continue to be shown with the
97 * security warning.
98 * <tr>
99 * <th scope="row">listenToAllAWTEvents
100 * <td>Listen to all AWT events, system-wide
101 * <td>After adding an AWT event listener, malicious code may scan all AWT
102 * events dispatched in the system, allowing it to read all user input (such
103 * as passwords). Each AWT event listener is called from within the context
104 * of that event queue's EventDispatchThread, so if the accessEventQueue
105 * permission is also enabled, malicious code could modify the contents of
106 * AWT event queues system-wide, causing the application or applet to
107 * misbehave in an insecure manner.
108 * <tr>
109 * <th scope="row">readDisplayPixels
110 * <td>Readback of pixels from the display screen
111 * <td>Interfaces such as the java.awt.Composite interface or the
112 * java.awt.Robot class allow arbitrary code to examine pixels on the
113 * display enable malicious code to snoop on the activities of the user.
114 * <tr>
115 * <th scope="row">replaceKeyboardFocusManager
116 * <td>Sets the {@code KeyboardFocusManager} for a particular thread.
117 * <td>When {@code SecurityManager} is installed, the invoking thread must
118 * be granted this permission in order to replace the current
119 * {@code KeyboardFocusManager}. If permission is not granted, a
120 * {@code SecurityException} will be thrown.
121 * <tr>
122 * <th scope="row">setAppletStub
123 * <td>Setting the stub which implements Applet container services
124 * <td>Malicious code could set an applet's stub and result in unexpected
125 * behavior or denial of service to an applet.
126 * <tr>
127 * <th scope="row">setWindowAlwaysOnTop
128 * <td>Setting always-on-top property of the window:
129 * {@link Window#setAlwaysOnTop}
130 * <td>The malicious window might make itself look and behave like a real
131 * full desktop, so that information entered by the unsuspecting user is
132 * captured and subsequently misused
133 * <tr>
134 * <th scope="row">showWindowWithoutWarningBanner
135 * <td>Display of a window without also displaying a banner warning that the
136 * window was created by an applet
137 * <td>Without this warning, an applet may pop up windows without the user
138 * knowing that they belong to an applet. Since users may make
139 * security-sensitive decisions based on whether or not the window belongs
140 * to an applet (entering a username and password into a dialog box, for
141 * example), disabling this warning banner may allow applets to trick the
142 * user into entering such information.
143 * <tr>
144 * <th scope="row">toolkitModality
145 * <td>Creating {@link Dialog.ModalityType#TOOLKIT_MODAL TOOLKIT_MODAL}
146 * dialogs and setting the
147 * {@link Dialog.ModalExclusionType#TOOLKIT_EXCLUDE TOOLKIT_EXCLUDE} window
148 * property.
149 * <td>When a toolkit-modal dialog is shown from an applet, it blocks all
150 * other applets in the browser. When launching applications from Java Web
151 * Start, its windows (such as the security dialog) may also be blocked by
152 * toolkit-modal dialogs, shown from these applications.
153 * <tr>
154 * <th scope="row">watchMousePointer
155 * <td>Getting the information about the mouse pointer position at any time
156 * <td>Constantly watching the mouse pointer, an applet can make guesses
157 * about what the user is doing, i.e. moving the mouse to the lower left
158 * corner of the screen most likely means that the user is about to launch
159 * an application. If a virtual keypad is used so that keyboard is emulated
160 * using the mouse, an applet may guess what is being typed.
161 * </tbody>
162 * </table>
163 *
164 * @see java.security.BasicPermission
165 * @see java.security.Permission
166 * @see java.security.Permissions
167 * @see java.security.PermissionCollection
168 * @see java.lang.SecurityManager
169 *
170 * @author Marianne Mueller
171 * @author Roland Schemers
172 */
173 public final class AWTPermission extends BasicPermission {
174
175 /** use serialVersionUID from the Java 2 platform for interoperability */
176 private static final long serialVersionUID = 8890392402588814465L;
177
178 /**
179 * Creates a new {@code AWTPermission} with the specified name.
180 * The name is the symbolic name of the {@code AWTPermission},
181 * such as "topLevelWindow", "systemClipboard", etc. An asterisk
182 * may be used to indicate all AWT permissions.
183 *
184 * @param name the name of the AWTPermission
185 *
186 * @throws NullPointerException if {@code name} is {@code null}.
187 * @throws IllegalArgumentException if {@code name} is empty.
188 */
189
190 public AWTPermission(String name)
191 {
192 super(name);
193 }
194
195 /**
196 * Creates a new {@code AWTPermission} object with the specified name.
197 * The name is the symbolic name of the {@code AWTPermission}, and the
198 * actions string is currently unused and should be {@code null}.
199 *
200 * @param name the name of the {@code AWTPermission}
201 * @param actions should be {@code null}
202 *
203 * @throws NullPointerException if {@code name} is {@code null}.
204 * @throws IllegalArgumentException if {@code name} is empty.
205 */
206
207 public AWTPermission(String name, String actions)
208 {
209 super(name, actions);
210 }
211 }