javax.security.auth.kerberos

Class ServicePermission

  1. java.lang.Object
  2. extended byjava.security.Permission
  3. extended byjavax.security.auth.kerberos.ServicePermission
All implemented interfaces:
java.io.Serializable, java.security.Guard

  1. public final class ServicePermission
  2. extends java.security.Permission
  3. implements java.io.Serializable
This class is used to protect Kerberos services and the credentials necessary to access those services. There is a one to one mapping of a service principal and the credentials necessary to access the service. Therefore granting access to a service principal implicitly grants access to the credential necessary to establish a security context with the service principal. This applies regardless of whether the credentials are in a cache or acquired via an exchange with the KDC. The credential can be either a ticket granting ticket, a service ticket or a secret key from a key table.

A ServicePermission contains a service principal name and a list of actions which specify the context the credential can be used within.

The service principal name is the canonical name of the KereberosPrincipal supplying the service, that is the KerberosPrincipal represents a Kerberos service principal. This name is treated in a case sensitive manner.

Granting this permission implies that the caller can use a cached credential (TGT, service ticket or secret key) within the context designated by the action. In the case of the TGT, granting this permission also implies that the TGT can be obtained by an Authentication Service exchange.

The possible actions are:

    initiate -              allow the caller to use the credential to
                            initiate a security context with a service
                            principal.
     accept -                allow the caller to use the credential to
                            accept security context as a particular
                            principal.
 
For example, to specify the permission to access to the TGT to initiate a security context the permission is constructed as follows:

     ServicePermission("krbtgt/EXAMPLE.COM@EXAMPLE.COM", "initiate");
 

To obtain a service ticket to initiate a context with the "host" service the permission is constructed as follows:

     ServicePermission("host/foo.example.com@EXAMPLE.COM", "initiate");
 

For a Kerberized server the action is "accept". For example, the permission necessary to access and use the secret key of the Kerberized "host" service (telnet and the likes) would be constructed as follows:

     ServicePermission("host/foo.example.com@EXAMPLE.COM", "accept");
 

Since:
JDK1.4
See Also:
Serialized Form

Constructor Summary

Constructor and Description
ServicePermission(java.lang.String servicePrinicipal,java.lang.String action)
Create a new ServicePermission with the specified servicePrincipal and action.

Method Summary

Modifier and Type Method and Description
  1. boolean
equals(java.lang.Object obj)
Checks two ServicePermission objects for equality.
  1. java.lang.String
getActions()
Returns the canonical string representation of the actions.
  1. int
hashCode()
Returns the hash code value for this object.
  1. boolean
implies(java.security.Permission p)
Checks if this Kerberos service permission object "implies" the specified permission.
  1. java.security.PermissionCollection
newPermissionCollection()
Returns a PermissionCollection object for storing ServicePermission objects.
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

ServicePermission

  1. public ServicePermission(java.lang.String servicePrinicipal,
  2. java.lang.String action)
Create a new ServicePermission with the specified servicePrincipal and action.
Parameters:
servicePrinicipal - the name of the service principal

action - the action string

Method Detail

implies

  1. public boolean implies(java.security.Permission p)
Checks if this Kerberos service permission object "implies" the specified permission.

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

Specified by:
implies in class java.security.Permission
Parameters:
p - the permission to check against.
Returns:
true if the specified permission is implied by this object, false if not.

equals

  1. public boolean equals(java.lang.Object obj)
Checks two ServicePermission objects for equality.

Specified by:
equals in class java.security.Permission
Parameters:
obj - the object to test for equality with this object.
Returns:
true if obj is a ServicePermission, and has the same service principal, and actions as this ServicePermission object.

hashCode

  1. public int hashCode()
Returns the hash code value for this object.
Specified by:
hashCode in class java.security.Permission
Returns:
a hash code value for this object.

getActions

  1. public java.lang.String getActions( )
Returns the canonical string representation of the actions. Always returns present actions in the following order: initiate, accept.
Specified by:
getActions in class java.security.Permission
Returns:
DOCUMENT ME!

newPermissionCollection

  1. public java.security.PermissionCollection newPermissionCollection( )
Returns a PermissionCollection object for storing ServicePermission objects.
ServicePermission 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 java.security.Permission
Returns:
a new PermissionCollection object suitable for storing ServicePermissions.