Autorisations couvrantes/implicites (moteur de base de données)

dbo.ImplyingPermissions

Cet exemple de script accepte comme arguments le nom de classe d'un sécurisable et le nom d'une autorisation. L'exemple parcourt la hiérarchie des autorisations, à partir d'un nœud spécifié jusqu'à la racine : CONTROL SERVER sur le serveur. Il émet la liste des autorisations qui incluent de manière implicite l'autorisation spécifiée.

CREATE FUNCTION dbo.ImplyingPermissions (@class nvarchar(64), 
   @permname nvarchar(64))
RETURNS @ImplPerms table (permname nvarchar(64), 
   class nvarchar(64), height int, rank int)
AS
BEGIN
   WITH 
   class_hierarchy(class_desc, parent_class_desc)
   AS
   (
   SELECT DISTINCT class_desc, parent_class_desc 
      FROM sys.fn_builtin_permissions('')
   ),
   PermT(class_desc, permission_name, covering_permission_name,
      parent_covering_permission_name, parent_class_desc)
   AS
   (
   SELECT class_desc, permission_name, covering_permission_name,
      parent_covering_permission_name, parent_class_desc
      FROM sys.fn_builtin_permissions('')
   ),
   permission_covers(permission_name, class_desc, level,
      inserted_as)
   AS
    (
    SELECT permission_name, class_desc, 0, 0
       FROM PermT
       WHERE permission_name = @permname AND
       class_desc = @class
    UNION ALL
    SELECT covering_permission_name, class_desc, 0, 1
       FROM PermT 
       WHERE class_desc = @class AND 
          permission_name = @permname AND
          len(covering_permission_name) > 0
    UNION ALL
    SELECT PermT.covering_permission_name, 
       PermT.class_desc, permission_covers.level,
       permission_covers.inserted_as + 1
       FROM PermT, permission_covers WHERE
       permission_covers.permission_name =
       PermT.permission_name AND
       permission_covers.class_desc = PermT.class_desc 
       AND len(PermT.covering_permission_name) > 0
    UNION ALL
    SELECT PermT.parent_covering_permission_name,
       PermT.parent_class_desc,
       permission_covers.level + 1,
       permission_covers.inserted_as + 1
       FROM PermT, permission_covers, class_hierarchy
       WHERE permission_covers.permission_name =
       PermT.permission_name AND 
       permission_covers.class_desc = PermT.class_desc
       AND permission_covers.class_desc = class_hierarchy.class_desc
       AND class_hierarchy.parent_class_desc =
       PermT.parent_class_desc AND
       len(PermT.parent_covering_permission_name) > 0
    )
  INSERT @ImplPerms
  SELECT DISTINCT permission_name, class_desc, 
     level, max(inserted_as) AS mia 
     FROM permission_covers
     GROUP BY class_desc, permission_name, level
     ORDER BY level, mia
  RETURN
END

A. Liste des autorisations qui impliquent l'autorisation ALTER sur un schéma

SELECT * FROM dbo.ImplyingPermissions('schema', 'alter')

B. Liste des autorisations qui impliquent l'autorisation VIEW DEFINITION sur un objet

SELECT * FROM dbo.ImplyingPermissions('object', 'view definition') 

C. Liste des autorisations qui impliquent l'autorisation TAKE OWNERSHIP sur un itinéraire

SELECT * FROM dbo.ImplyingPermissions('route', 'take ownership')

D. Liste des autorisations qui impliquent l'autorisation EXECUTE sur une collection de schémas XML

SELECT * FROM dbo.ImplyingPermissions('xml schema collection', 'execute')

Voir aussi

Référence

Concepts