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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class NetPermission - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.net
Class NetPermission

java.lang.Object
  |
  +--java.security.Permission
        |
        +--java.security.BasicPermission
              |
              +--java.net.NetPermission

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public final class NetPermission

extends BasicPermission

This class is for various network permissions. A NetPermission contains a name (also referred to as 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 network permission (see below). The naming convention follows the hierarchical property naming convention. Also, an asterisk may appear at the end of the name, following a ".", or by itself, to signify a wildcard match. For example: "foo.*" or "*" is valid, "*foo" or "a*b" is not valid.

The following table lists all the possible NetPermission 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
setDefaultAuthenticator	The ability to set the way authentication information is retrieved when a proxy or HTTP server asks for authentication	Malicious code can set an authenticator that monitors and steals user authentication input as it retrieves the input from the user.
requestPasswordAuthentication	The ability to ask the authenticator registered with the system for a password	Malicious code may steal this password.
specifyStreamHandler	The ability to specify a stream handler when constructing a URL	Malicious code may create a URL with resources that it would normally not have access to (like file:/foo/fum/), specifying a stream handler that gets the actual bytes from someplace it does have access to. Thus it might be able to trick the system into creating a ProtectionDomain/CodeSource for a class even though that class really didn't come from that location.

See Also:

BasicPermission, Permission, Permissions, PermissionCollection, SecurityManager, Serialized Form

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Constructor Summary

NetPermission(String name)           Creates a new NetPermission with the specified name.

NetPermission(String name, String actions)           Creates a new NetPermission object with the specified name.

 

Methods inherited from class java.security.BasicPermission

equals, getActions, hashCode, implies, newPermissionCollection

 

Methods inherited from class java.security.Permission

checkGuard, getName, toString

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Constructor Detail

NetPermission

public NetPermission(String name)

Creates a new NetPermission with the specified name. The name is the symbolic name of the NetPermission, such as "setDefaultAuthenticator", etc. An asterisk may appear at the end of the name, following a ".", or by itself, to signify a wildcard match.

Parameters:

name - the name of the NetPermission.

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NetPermission

public NetPermission(String name,
                     String actions)

Creates a new NetPermission object with the specified name. The name is the symbolic name of the NetPermission, and the actions String is currently unused and should be null. This constructor exists for use by the Policy object to instantiate new Permission objects.

Parameters:

name - the name of the NetPermission.

actions - should be null.

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