public final class

DelegationPermission

extends BasicPermission
implements Serializable
java.lang.Object
   ↳ java.security.Permission
     ↳ java.security.BasicPermission
       ↳ javax.security.auth.kerberos.DelegationPermission

Class Overview

This class is used to restrict the usage of the Kerberos delegation model, ie: forwardable and proxiable tickets.

The target name of this Permission specifies a pair of kerberos service principals. The first is the subordinate service principal being entrusted to use the TGT. The second service principal designates the target service the subordinate service principal is to interact with on behalf of the initiating KerberosPrincipal. This latter service principal is specified to restrict the use of a proxiable ticket.

For example, to specify the "host" service use of a forwardable TGT the target permission is specified as follows:

  DelegationPermission("\"host/foo.example.com@EXAMPLE.COM\" \"krbtgt/EXAMPLE.COM@EXAMPLE.COM\"");
 

To give the "backup" service a proxiable nfs service ticket the target permission might be specified:

  DelegationPermission("\"backup/bar.example.com@EXAMPLE.COM\" \"nfs/home.EXAMPLE.COM@EXAMPLE.COM\"");
 

Summary

Public Constructors
DelegationPermission(String principals)
Create a new DelegationPermission with the specified subordinate and target principals.
DelegationPermission(String principals, String actions)
Create a new DelegationPermission with the specified subordinate and target principals.
Public Methods
boolean equals(Object obj)
Checks two DelegationPermission objects for equality.
int hashCode()
Returns the hash code value for this object.
boolean implies(Permission p)
Checks if this Kerberos delegation permission object "implies" the specified permission.
PermissionCollection newPermissionCollection()
Returns a PermissionCollection object for storing DelegationPermission objects.
[Expand]
Inherited Methods
From class java.security.BasicPermission
From class java.security.Permission
From class java.lang.Object
From interface java.security.Guard

Public Constructors

public DelegationPermission (String principals)

Create a new DelegationPermission with the specified subordinate and target principals.

Parameters
principals the name of the subordinate and target principals
Throws
NullPointerException if principals is null.
IllegalArgumentException if principals is empty.

public DelegationPermission (String principals, String actions)

Create a new DelegationPermission with the specified subordinate and target principals.

Parameters
principals the name of the subordinate and target principals

actions should be null.
Throws
NullPointerException if principals is null.
IllegalArgumentException if principals is empty.

Public Methods

public boolean equals (Object obj)

Checks two DelegationPermission objects for equality.

Parameters
obj the object to test for equality with this object.
Returns
  • true if obj is a DelegationPermission, and has the same subordinate and service principal as this. DelegationPermission object.

public int hashCode ()

Returns the hash code value for this object.

Returns
  • a hash code value for this object.

public boolean implies (Permission p)

Checks if this Kerberos delegation permission object "implies" the specified permission.

If none of the above are true, implies returns false.

Parameters
p the permission to check against.
Returns
  • true if the specified permission is implied by this object, false if not.

public PermissionCollection newPermissionCollection ()

Returns a PermissionCollection object for storing DelegationPermission objects.
DelegationPermission objects must be stored in a manner that allows them to be inserted into the collection in any order, but that also enables the PermissionCollection implies method to be implemented in an efficient (and consistent) manner.

Returns
  • a new PermissionCollection object suitable for storing DelegationPermissions.