DelegationPermission (Java Platform SE 8 )
Keywords: javax.security.auth.kerberos.DelegationPermission class
Date: 2026-04-17

compact3
javax.security.auth.kerberos

## 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 Summary

    Constructors
    Constructor and Description
    `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.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `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.

    - ### Methods inherited from class java.security.BasicPermission

      `getActions`

    - ### 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

    - #### 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.

    - #### 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.

  - ### Method Detail

    - #### implies

          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.

      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.

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