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INTERNET-DRAFT                                      Kurt D. Zeilenga
Intended Category: Informational                    OpenLDAP Foundation
Expires in six months                               3 February 2004

               LDAP: Requesting Attributes by Object Class

Status of this Memo

  This document is an Internet-Draft and is in full conformance with all
  provisions of Section 10 of RFC2026.

  This document is intended to be, after appropriate review and
  revision, submitted to the RFC Editor as an Informational document.
  Distribution of this memo is unlimited.  Technical discussion of this
  document will take place on the IETF LDAP Extensions mailing list
  <ldapext@ietf.org>.  Please send editorial comments directly to the
  author <Kurt@OpenLDAP.org>.

  Internet-Drafts are working documents of the Internet Engineering Task
  Force (IETF), its areas, and its working groups.  Note that other
  groups may also distribute working documents as Internet-Drafts.
  Internet-Drafts are draft documents valid for a maximum of six months
  and may be updated, replaced, or obsoleted by other documents at any
  time.  It is inappropriate to use Internet-Drafts as reference
  material or to cite them other than as ``work in progress.''

  The list of current Internet-Drafts can be accessed at
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  Copyright (C) The Internet Society (2004).  All Rights Reserved.

  Please see the Full Copyright section near the end of this document
  for more information.


  The Lightweight Directory Access Protocol (LDAP) search operation
  provides mechanisms for clients to request all user application
  attributes, all operational attributes, or attributes selected by
  their description.  This document extends LDAP to provide a mechanism
  for LDAP clients to request the return of all attributes of an object

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1.  Overview

  In the Lightweight Directory Access Protocol (LDAP) [RFC3377], the
  search operation [RFC2251] support requesting a sets of attributes.
  This set is determined by a list of attribute descriptions.  Two
  special descriptors are defined to request all user attributes ("*")
  [RFC2251] and all operational attributes ("+") [RFC3673].  However,
  there is no convenient mechanism for requesting pre-defined sets of

  This document extends LDAP to allow an object class identifier to be
  specified in search request attributes list to request the return all
  attributes allowed by object class.  A commercial at sign ("@",
  U+0040) is used to distinguish an object class identifier from an
  attribute descriptions.

  For example, the attribute list of "@country" is equivalent to the
  attribute list of 'c', 'searchGuide', 'description', and
  'objectClass'.  This object class and its attributes are described in

  This extension is intended to be used where the user is in direct
  control of the parameters of the LDAP search operation, such as when
  entering a LDAP URL [RFC2255] into a web browser.

2. Terminology

  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
  document are to be interpreted as described in BCP 14 [RFC2119].

  DSA stands for Directory System Agent (or server).
  DSE stands for DSA-specific Entry.

3.  Return of all Attributes of an Object Class

  This extension allows object class identifiers is to be provided in
  the attributes field of the LDAP SearchRequest [RFC2251].  For each
  object class identified in the attributes field, the request is to be
  treated as if each attribute allowed by that class (by "MUST" or
  "MAY", directly or by SUPerior) was itself listed.

  If the object class identifier is unrecognized, it is be treated an an
  unrecognized attribute description.

  This extension redefines the attributes field of the SearchRequest to

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  be a DescriptionList described by the following ASN.1 [X.680] data

       DescriptionList ::= SEQUENCE OF Description
       Description ::= LDAPString

  The Description is string conforming to the ABNF [RFC2234]:

       Description = AttributeDescription | ObjectClassDescription.
       ObjectClassDescription = AtSign ObjectClass *( ";" options )
       AtSign = "@" ; U+0040

  where <AttributeDescription> and <options> productions are as defined
  in Section 4.1.5 of [RFC2251] and an <ObjectClass> is an object
  identifier, in either <numericoid> or <descr> form [RFC2252], of an
  object class.

  <ObjectClassDescription> <options> are provided for extensibility.
  This document only defines semantics of <ObjectClassDescription>s with
  zero options in the attributes field of a SearchRequest.  Other uses
  may be defined in future specifications.

  Servers supporting this feature SHOULD publish the object identifier
  (OID) IANA-ASSIGNED-OID as a value of the 'supportedFeatures'
  [RFC3674] attribute in the root DSE.  Clients supporting this feature
  SHOULD NOT use the feature unless they have knowledge the server
  supports it.

3.  Security Considerations

  This extension provides a shorthand for requesting all attributes of
  an object class.  As these attributes which could have been listed
  individually, this short hand is not believed to raise additional
  security considerations.

  Implementors of this (or any) LDAP extension should be familiar with
  general LDAP security considerations [RFC3377].

4.  IANA Considerations

  Registration of the LDAP Protocol Mechanism [RFC3383] defined in
  document is requested.

      Subject: Request for LDAP Protocol Mechanism Registration
      Object Identifier:
      Description: OC AD Lists

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      Person & email address to contact for further information:
           Kurt Zeilenga <kurt@openldap.org>
      Usage: Feature
      Specification: RFC XXXX
      Author/Change Controller: Kurt Zeilenga <kurt@openldap.org>
      Comments: none

  This OID was assigned [ASSIGN] by OpenLDAP Foundation, under its
  IANA-assigned private enterprise allocation [PRIVATE], for use in this

5.  Author's Address

  Kurt D. Zeilenga
  OpenLDAP Foundation

  Email: Kurt@OpenLDAP.org

6. Normative References

  [RFC2119]     Bradner, S., "Key words for use in RFCs to Indicate
                Requirement Levels", BCP 14 (also RFC 2119), March 1997.

  [RFC2234]     Crocker, D. and P. Overell, "Augmented BNF for Syntax
                Specifications: ABNF", RFC 2234, November 1997.

  [RFC2251]     Wahl, M., T. Howes and S. Kille, "Lightweight Directory
                Access Protocol (v3)", RFC 2251, December 1997.

  [RFC2252]     Wahl, M., A. Coulbeck, T. Howes, and S. Kille,
                "Lightweight Directory Access Protocol (v3):  Attribute
                Syntax Definitions", RFC 2252, December 1997.

  [RFC3377]     Hodges, J. and R. Morgan, "Lightweight Directory Access
                Protocol (v3): Technical Specification", RFC 3377,
                September 2002.

  [Features]    Zeilenga, K., "Feature Discovery in LDAP", RFC 3674,
                December 2003.

  [X.680]       International Telecommunication Union -
                Telecommunication Standardization Sector, "Abstract
                Syntax Notation One (ASN.1) - Specification of Basic
                Notation", X.680(1997) (also ISO/IEC 8824-1:1998).

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7. Informative References

  [RFC2255]     Howes, T. and M. Smith, "The LDAP URL Format", RFC 2255,
                December, 1997.

  [RFC2256]     Wahl, M., "A Summary of the X.500(96) User Schema for
                use with LDAPv3", RFC 2256, December 1997.

  [RFC3383]     Zeilenga, K., "IANA Considerations for LDAP", BCP 64
                (also RFC 3383), September 2002.

  [RFC3673]     Zeilenga, K., "LDAPv3: All Operational Attributes", RFC
                3673, December 2003.

  [ASSIGN]      OpenLDAP Foundation, "OpenLDAP OID Delegations",

  [PRIVATE]     IANA, "Private Enterprise Numbers",

Full Copyright

  Copyright (C) The Internet Society (2004). All Rights Reserved.

  This document and translations of it may be copied and furnished to
  others, and derivative works that comment on or otherwise explain it
  or assist in its implementation may be prepared, copied, published and
  distributed, in whole or in part, without restriction of any kind,
  provided that the above copyright notice and this paragraph are
  included on all such copies and derivative works.  However, this
  document itself may not be modified in any way, such as by removing
  the copyright notice or references to the Internet Society or other
  Internet organizations, except as needed for the  purpose of
  developing Internet standards in which case the procedures for
  copyrights defined in the Internet Standards process must be followed,
  or as required to translate it into languages other than English.

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