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package java.awt;
import java.security.BasicPermission;
This class is for AWT permissions.
An AWTPermission contains a target name but
no actions list; you either have the named permission
or you don't.
The target name is the name of the AWT permission (see below). The naming
convention follows the hierarchical property naming convention.
Also, an asterisk could be used to represent all AWT permissions.
The following table lists all the possible AWTPermission
target names, and for each provides a description of what the
permission allows and a discussion of the risks of granting code
the permission.
Permission Target Name
What the Permission Allows
Risks of Allowing this Permission
accessClipboard
Posting and retrieval of information to and from the AWT clipboard
This would allow malfeasant code to share
potentially sensitive or confidential information.
accessEventQueue
Access to the AWT event queue
After retrieving the AWT event queue,
malicious code may peek at and even remove existing events
from its event queue, as well as post bogus events which may purposefully
cause the application or applet to misbehave in an insecure manner.
accessSystemTray
Access to the AWT SystemTray instance
This would allow malicious code to add tray icons to the system tray.
First, such an icon may look like the icon of some known application
(such as a firewall or anti-virus) and order a user to do something unsafe
(with help of balloon messages). Second, the system tray may be glutted with
tray icons so that no one could add a tray icon anymore.
createRobot
Create java.awt.Robot objects
The java.awt.Robot object allows code to generate native-level
mouse and keyboard events as well as read the screen. It could allow
malicious code to control the system, run other programs, read the
display, and deny mouse and keyboard access to the user.
fullScreenExclusive
Enter full-screen exclusive mode
Entering full-screen exclusive mode allows direct access to low-level graphics card memory. This could be used to spoof the system, since the program is in direct control of rendering. Depending on the implementation, the security warning may not be shown for the windows used to enter the full-screen exclusive mode (assuming that the
fullScreenExclusive permission has been granted to this application). Note that this behavior does not mean that the
showWindowWithoutWarningBanner permission will be automatically granted to the application which has the fullScreenExclusive permission: non-full-screen windows will continue to be shown with the security warning.
listenToAllAWTEvents
Listen to all AWT events, system-wide
After adding an AWT event listener,
malicious code may scan all AWT events dispatched in the system,
allowing it to read all user input (such as passwords). Each
AWT event listener is called from within the context of that
event queue's EventDispatchThread, so if the accessEventQueue
permission is also enabled, malicious code could modify the
contents of AWT event queues system-wide, causing the application
or applet to misbehave in an insecure manner.
readDisplayPixels
Readback of pixels from the display screen
Interfaces such as the java.awt.Composite interface or the
java.awt.Robot class allow arbitrary code to examine pixels on the
display enable malicious code to snoop on the activities of the user.
replaceKeyboardFocusManager
Sets the KeyboardFocusManager for
a particular thread.
When SecurityManager is installed, the invoking
thread must be granted this permission in order to replace
the current KeyboardFocusManager. If permission
is not granted, a SecurityException will be thrown.
setAppletStub
Setting the stub which implements Applet container services
Malicious code could set an applet's stub and result in unexpected
behavior or denial of service to an applet.
setWindowAlwaysOnTop
Setting always-on-top property of the window: Window.setAlwaysOnTop
The malicious window might make itself look and behave like a real full desktop, so that
information entered by the unsuspecting user is captured and subsequently misused
showWindowWithoutWarningBanner
Display of a window without also displaying a banner warning
that the window was created by an applet
Without this warning,
an applet may pop up windows without the user knowing that they
belong to an applet. Since users may make security-sensitive
decisions based on whether or not the window belongs to an applet
(entering a username and password into a dialog box, for example),
disabling this warning banner may allow applets to trick the user
into entering such information.
toolkitModality
Creating TOOLKIT_MODAL dialogs and setting the
TOOLKIT_EXCLUDE window property.
When a toolkit-modal dialog is shown from an applet, it blocks all other
applets in the browser. When launching applications from Java Web Start,
its windows (such as the security dialog) may also be blocked by toolkit-modal
dialogs, shown from these applications.
watchMousePointer
Getting the information about the mouse pointer position at any
time
Constantly watching the mouse pointer,
an applet can make guesses about what the user is doing, i.e. moving
the mouse to the lower left corner of the screen most likely means that
the user is about to launch an application. If a virtual keypad is used
so that keyboard is emulated using the mouse, an applet may guess what
is being typed.
Author: Marianne Mueller, Roland Schemers See Also:
/**
* This class is for AWT permissions.
* An <code>AWTPermission</code> contains a target name but
* no actions list; you either have the named permission
* or you don't.
*
* <P>
* The target name is the name of the AWT permission (see below). The naming
* convention follows the hierarchical property naming convention.
* Also, an asterisk could be used to represent all AWT permissions.
*
* <P>
* The following table lists all the possible <code>AWTPermission</code>
* target names, and for each provides a description of what the
* permission allows and a discussion of the risks of granting code
* the permission.
*
* <table border=1 cellpadding=5 summary="AWTPermission target names, descriptions, and associated risks.">
* <tr>
* <th>Permission Target Name</th>
* <th>What the Permission Allows</th>
* <th>Risks of Allowing this Permission</th>
* </tr>
*
* <tr>
* <td>accessClipboard</td>
* <td>Posting and retrieval of information to and from the AWT clipboard</td>
* <td>This would allow malfeasant code to share
* potentially sensitive or confidential information.</td>
* </tr>
*
* <tr>
* <td>accessEventQueue</td>
* <td>Access to the AWT event queue</td>
* <td>After retrieving the AWT event queue,
* malicious code may peek at and even remove existing events
* from its event queue, as well as post bogus events which may purposefully
* cause the application or applet to misbehave in an insecure manner.</td>
* </tr>
*
* <tr>
* <td>accessSystemTray</td>
* <td>Access to the AWT SystemTray instance</td>
* <td>This would allow malicious code to add tray icons to the system tray.
* First, such an icon may look like the icon of some known application
* (such as a firewall or anti-virus) and order a user to do something unsafe
* (with help of balloon messages). Second, the system tray may be glutted with
* tray icons so that no one could add a tray icon anymore.</td>
* </tr>
*
* <tr>
* <td>createRobot</td>
* <td>Create java.awt.Robot objects</td>
* <td>The java.awt.Robot object allows code to generate native-level
* mouse and keyboard events as well as read the screen. It could allow
* malicious code to control the system, run other programs, read the
* display, and deny mouse and keyboard access to the user.</td>
* </tr>
*
* <tr>
* <td>fullScreenExclusive</td>
* <td>Enter full-screen exclusive mode</td>
* <td>Entering full-screen exclusive mode allows direct access to
* low-level graphics card memory. This could be used to spoof the
* system, since the program is in direct control of rendering. Depending on
* the implementation, the security warning may not be shown for the windows
* used to enter the full-screen exclusive mode (assuming that the {@code
* fullScreenExclusive} permission has been granted to this application). Note
* that this behavior does not mean that the {@code
* showWindowWithoutWarningBanner} permission will be automatically granted to
* the application which has the {@code fullScreenExclusive} permission:
* non-full-screen windows will continue to be shown with the security
* warning.</td>
* </tr>
*
* <tr>
* <td>listenToAllAWTEvents</td>
* <td>Listen to all AWT events, system-wide</td>
* <td>After adding an AWT event listener,
* malicious code may scan all AWT events dispatched in the system,
* allowing it to read all user input (such as passwords). Each
* AWT event listener is called from within the context of that
* event queue's EventDispatchThread, so if the accessEventQueue
* permission is also enabled, malicious code could modify the
* contents of AWT event queues system-wide, causing the application
* or applet to misbehave in an insecure manner.</td>
* </tr>
*
* <tr>
* <td>readDisplayPixels</td>
* <td>Readback of pixels from the display screen</td>
* <td>Interfaces such as the java.awt.Composite interface or the
* java.awt.Robot class allow arbitrary code to examine pixels on the
* display enable malicious code to snoop on the activities of the user.</td>
* </tr>
*
* <tr>
* <td>replaceKeyboardFocusManager</td>
* <td>Sets the <code>KeyboardFocusManager</code> for
* a particular thread.
* <td>When <code>SecurityManager</code> is installed, the invoking
* thread must be granted this permission in order to replace
* the current <code>KeyboardFocusManager</code>. If permission
* is not granted, a <code>SecurityException</code> will be thrown.
* </tr>
*
* <tr>
* <td>setAppletStub</td>
* <td>Setting the stub which implements Applet container services</td>
* <td>Malicious code could set an applet's stub and result in unexpected
* behavior or denial of service to an applet.</td>
* </tr>
*
* <tr>
* <td>setWindowAlwaysOnTop</td>
* <td>Setting always-on-top property of the window: {@link Window#setAlwaysOnTop}</td>
* <td>The malicious window might make itself look and behave like a real full desktop, so that
* information entered by the unsuspecting user is captured and subsequently misused </td>
* </tr>
*
* <tr>
* <td>showWindowWithoutWarningBanner</td>
* <td>Display of a window without also displaying a banner warning
* that the window was created by an applet</td>
* <td>Without this warning,
* an applet may pop up windows without the user knowing that they
* belong to an applet. Since users may make security-sensitive
* decisions based on whether or not the window belongs to an applet
* (entering a username and password into a dialog box, for example),
* disabling this warning banner may allow applets to trick the user
* into entering such information.</td>
* </tr>
*
* <tr>
* <td>toolkitModality</td>
* <td>Creating {@link Dialog.ModalityType#TOOLKIT_MODAL TOOLKIT_MODAL} dialogs
* and setting the {@link Dialog.ModalExclusionType#TOOLKIT_EXCLUDE
* TOOLKIT_EXCLUDE} window property.</td>
* <td>When a toolkit-modal dialog is shown from an applet, it blocks all other
* applets in the browser. When launching applications from Java Web Start,
* its windows (such as the security dialog) may also be blocked by toolkit-modal
* dialogs, shown from these applications.</td>
* </tr>
*
* <tr>
* <td>watchMousePointer</td>
* <td>Getting the information about the mouse pointer position at any
* time</td>
* <td>Constantly watching the mouse pointer,
* an applet can make guesses about what the user is doing, i.e. moving
* the mouse to the lower left corner of the screen most likely means that
* the user is about to launch an application. If a virtual keypad is used
* so that keyboard is emulated using the mouse, an applet may guess what
* is being typed.</td>
* </tr>
* </table>
*
* @see java.security.BasicPermission
* @see java.security.Permission
* @see java.security.Permissions
* @see java.security.PermissionCollection
* @see java.lang.SecurityManager
*
*
* @author Marianne Mueller
* @author Roland Schemers
*/
public final class AWTPermission extends BasicPermission {
use serialVersionUID from the Java 2 platform for interoperability /** use serialVersionUID from the Java 2 platform for interoperability */
private static final long serialVersionUID = 8890392402588814465L;
Creates a new AWTPermission with the specified name.
The name is the symbolic name of the AWTPermission,
such as "topLevelWindow", "systemClipboard", etc. An asterisk
may be used to indicate all AWT permissions.
Params: - name – the name of the AWTPermission
Throws: - NullPointerException – if
name is null. - IllegalArgumentException – if
name is empty.
/**
* Creates a new <code>AWTPermission</code> with the specified name.
* The name is the symbolic name of the <code>AWTPermission</code>,
* such as "topLevelWindow", "systemClipboard", etc. An asterisk
* may be used to indicate all AWT permissions.
*
* @param name the name of the AWTPermission
*
* @throws NullPointerException if <code>name</code> is <code>null</code>.
* @throws IllegalArgumentException if <code>name</code> is empty.
*/
public AWTPermission(String name)
{
super(name);
}
Creates a new AWTPermission object with the specified name.
The name is the symbolic name of the AWTPermission, and the
actions string is currently unused and should be null.
Params: - name – the name of the
AWTPermission - actions – should be
null
Throws: - NullPointerException – if
name is null. - IllegalArgumentException – if
name is empty.
/**
* Creates a new <code>AWTPermission</code> object with the specified name.
* The name is the symbolic name of the <code>AWTPermission</code>, and the
* actions string is currently unused and should be <code>null</code>.
*
* @param name the name of the <code>AWTPermission</code>
* @param actions should be <code>null</code>
*
* @throws NullPointerException if <code>name</code> is <code>null</code>.
* @throws IllegalArgumentException if <code>name</code> is empty.
*/
public AWTPermission(String name, String actions)
{
super(name, actions);
}
}