Class DelegationPermission

java.lang.Object
java.security.Permission
java.security.BasicPermission
javax.security.auth.kerberos.DelegationPermission
All Implemented Interfaces:
Serializable, Guard

public final class DelegationPermission extends BasicPermission implements Serializable
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\"");
 

Since:
1.4
See Also:
Serialized Form
  • Constructor Details

    • DelegationPermission

      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, or does not contain a pair of principals, or is improperly quoted
    • DelegationPermission

      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, or does not contain a pair of principals, or is improperly quoted
  • Method Details

    • implies

      public boolean implies(Permission p)
      Checks if this Kerberos delegation permission object "implies" the specified permission.

      This method returns true if this DelegationPermission is equal to p, and returns false otherwise.

      Overrides:
      implies in class BasicPermission
      Parameters:
      p - the permission to check against.
      Returns:
      true if the specified permission is implied by this object, false if not.
    • equals

      public boolean equals(Object obj)
      Checks two DelegationPermission objects for equality.
      Overrides:
      equals in class BasicPermission
      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.
      See Also:
      Object.hashCode(), HashMap
    • hashCode

      public int hashCode()
      Returns the hash code value for this object.
      Overrides:
      hashCode in class BasicPermission
      Returns:
      a hash code value for this object.
      See Also:
      Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
    • newPermissionCollection

      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.
      Overrides:
      newPermissionCollection in class BasicPermission
      Returns:
      a new PermissionCollection object suitable for storing DelegationPermissions.