Policy (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

javax.security.auth
Class Policy

java.lang.Object
  javax.security.auth.Policy

        public PermissionCollection getPermissions
            (java.security.ProtectionDomain pd)
 
 

        public ProtectionDomain
            (CodeSource cs,
             PermissionCollection permissions,
             ClassLoader loader,
             Principal[] principals)
 

@Deprecated
public abstract class Policy
extends Object

This is an abstract class for representing the system policy for Subject-based authorization. A subclass implementation of this class provides a means to specify a Subject-based access control Policy.

A Policy object can be queried for the set of Permissions granted to code running as a Principal in the following manner:

        policy = Policy.getPolicy();
        PermissionCollection perms = policy.getPermissions(subject,
                                                        codeSource);
 

A Policy contains the following information. Note that this example only represents the syntax for the default Policy implementation. Subclass implementations of this class may implement alternative syntaxes and may retrieve the Policy from any source such as files, databases, or servers.

Each entry in the Policy is represented as a grant entry. Each grant entry specifies a codebase, code signers, and Principals triplet, as well as the Permissions granted to that triplet.

        grant CodeBase ["URL"], Signedby ["signers"],
              Principal [Principal_Class] "Principal_Name" {
            Permission Permission_Class ["Target_Name"]
                                        [, "Permission_Actions"]
                                        [, signedBy "SignerName"];
        };
 

        grant CodeBase "foo.com", Signedby "foo",
              Principal com.sun.security.auth.SolarisPrincipal "duke" {
            permission java.io.FilePermission "/home/duke", "read, write";
        };
 

To "run" as a particular Principal, code invokes the Subject.doAs(subject, ...) method. After invoking that method, the code runs as all the Principals associated with the specified Subject. Note that this Policy (and the Permissions granted in this Policy) only become effective after the call to Subject.doAs has occurred.

Multiple Principals may be listed within one grant entry. All the Principals in the grant entry must be associated with the Subject provided to Subject.doAs for that Subject to be granted the specified Permissions.

        grant Principal com.sun.security.auth.SolarisPrincipal "duke",
              Principal com.sun.security.auth.SolarisNumericUserPrincipal "0" {
            permission java.io.FilePermission "/home/duke", "read, write";
            permission java.net.SocketPermission "duke.com", "connect";
        };
 

Note that non Principal-based grant entries are not permitted in this Policy. Therefore, grant entries such as:

        grant CodeBase "foo.com", Signedby "foo" {
            permission java.io.FilePermission "/tmp/scratch", "read, write";
        };
 

The default Policy implementation can be changed by setting the value of the "auth.policy.provider" security property (in the Java security properties file) to the fully qualified name of the desired Policy implementation class. The Java security properties file is located in the file named <JAVA_HOME>/lib/security/java.security, where <JAVA_HOME> refers to the directory where the JDK was installed.

Constructor Summary
protected	Policy()           Deprecated. Sole constructor.

 

Method Summary
abstract  PermissionCollection	getPermissions(Subject subject, CodeSource cs)           Deprecated. Retrieve the Permissions granted to the Principals associated with the specified CodeSource.
static Policy	getPolicy()           Deprecated. Returns the installed Policy object.
abstract  void	refresh()           Deprecated. Refresh and reload the Policy.
static void	setPolicy(Policy policy)           Deprecated. Sets the system-wide Policy object.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

Policy

protected Policy()

Deprecated. 

Sole constructor. (For invocation by subclass constructors, typically implicit.)

getPolicy

public static Policy getPolicy()

Deprecated. 

Returns the installed Policy object. This method first calls SecurityManager.checkPermission with the AuthPermission("getPolicy") permission to ensure the caller has permission to get the Policy object.

Returns:

the installed Policy. The return value cannot be null.

Throws:

SecurityException - if the current thread does not have permission to get the Policy object.

See Also:

setPolicy(javax.security.auth.Policy)

setPolicy

public static void setPolicy(Policy policy)

Deprecated. 

Sets the system-wide Policy object. This method first calls SecurityManager.checkPermission with the AuthPermission("setPolicy") permission to ensure the caller has permission to set the Policy.

Parameters:

policy - the new system Policy object.

Throws:

SecurityException - if the current thread does not have permission to set the Policy.

See Also:

getPolicy()

getPermissions

public abstract PermissionCollection getPermissions(Subject subject,
                                                    CodeSource cs)

Deprecated. 

Retrieve the Permissions granted to the Principals associated with the specified CodeSource.

Parameters:

subject - the Subject whose associated Principals, in conjunction with the provided CodeSource, determines the Permissions returned by this method. This parameter may be null.

cs - the code specified by its CodeSource that determines, in conjunction with the provided Subject, the Permissions returned by this method. This parameter may be null.

Returns:

the Collection of Permissions granted to all the Subject and code specified in the provided subject and cs parameters.

refresh

public abstract void refresh()

Deprecated. 

Refresh and reload the Policy.

This method causes this object to refresh/reload its current Policy. This is implementation-dependent. For example, if the Policy object is stored in a file, calling refresh will cause the file to be re-read.

Throws:

SecurityException - if the caller does not have permission to refresh the Policy.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.