Java™ Platform
Standard Ed. 6

javax.security.auth.kerberos
Class ServicePermission

java.lang.Object
  extended by java.security.Permission
      extended by javax.security.auth.kerberos.ServicePermission
All Implemented Interfaces:
Serializable, Guard

public final class ServicePermission
extends Permission
implements 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. An asterisk may appear by itself, to signify any service principal.

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:
1.4
See Also:
Serialized Form

Constructor Summary
ServicePermission(String servicePrincipal, String action)
          Create a new ServicePermission with the specified servicePrincipal and action.
 
Method Summary
 boolean equals(Object obj)
          Checks two ServicePermission objects for equality.
 String getActions()
          Returns the canonical string representation of the actions.
 int hashCode()
          Returns the hash code value for this object.
 boolean implies(Permission p)
          Checks if this Kerberos service permission object "implies" the specified permission.
 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

public ServicePermission(String servicePrincipal,
                         String action)
Create a new ServicePermission with the specified servicePrincipal and action.

Parameters:
servicePrincipal - the name of the service principal. An asterisk may appear by itself, to signify any service principal.

action - the action string
Method Detail

implies

public boolean implies(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 Permission
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 ServicePermission objects for equality.

Specified by:
equals in class 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.
See Also:
Object.hashCode(), Hashtable

hashCode

public int hashCode()
Returns the hash code value for this object.

Specified by:
hashCode in class Permission
Returns:
a hash code value for this object.
See Also:
Object.equals(java.lang.Object), Hashtable

getActions

public 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 Permission
Returns:
the actions of this Permission.

newPermissionCollection

public 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 Permission
Returns:
a new PermissionCollection object suitable for storing ServicePermissions.

Java™ Platform
Standard Ed. 6

Submit a bug or feature
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.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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