Java™ Platform
Standard Ed. 6

java.net
Class NetPermission

java.lang.Object
  extended by java.security.Permission
      extended by java.security.BasicPermission
          extended by java.net.NetPermission
All Implemented Interfaces:
Serializable, Guard

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.
setProxySelector The ability to set the proxy selector used to make decisions on which proxies to use when making network connections. Malicious code can set a ProxySelector that directs network traffic to an arbitrary network host.
getProxySelector The ability to get the proxy selector used to make decisions on which proxies to use when making network connections. Malicious code can get a ProxySelector to discover proxy hosts and ports on internal networks, which could then become targets for attack.
setCookieHandler The ability to set the cookie handler that processes highly security sensitive cookie information for an Http session. Malicious code can set a cookie handler to obtain access to highly security sensitive cookie information. Some web servers use cookies to save user private information such as access control information, or to track user browsing habit.
getCookieHandler The ability to get the cookie handler that processes highly security sensitive cookie information for an Http session. Malicious code can get a cookie handler to obtain access to highly security sensitive cookie information. Some web servers use cookies to save user private information such as access control information, or to track user browsing habit.
setResponseCache The ability to set the response cache that provides access to a local response cache. Malicious code getting access to the local response cache could access security sensitive information, or create false entries in the response cache.
getResponseCache The ability to get the response cache that provides access to a local response cache. Malicious code getting access to the local response cache could access security sensitive information.

See Also:
BasicPermission, Permission, Permissions, PermissionCollection, SecurityManager, Serialized Form

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.
 
Method Summary
 
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.
Throws:
NullPointerException - if name is null.
IllegalArgumentException - if name is empty.

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.

Parameters:
name - the name of the NetPermission.
actions - should be null.
Throws:
NullPointerException - if name is null.
IllegalArgumentException - if name is empty.

Java™ Platform
Standard Ed. 6

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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