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Network Working Group                                        K. Zeilenga
Request for Comments: 4529                           OpenLDAP Foundation
Category: Informational                                        June 2006

              Requesting Attributes by Object Class in the
              Lightweight Directory Access Protocol (LDAP)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

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

Table of Contents

   1. Background and Intended Use .....................................1
   2. Terminology .....................................................2
   3. Return of all Attributes of an Object Class .....................2
   4. Security Considerations .........................................3
   5. IANA Considerations .............................................3
   6. References ......................................................4
      6.1. Normative References .......................................4
      6.2. Informative References .....................................4

1.  Background and Intended Use

   In the Lightweight Directory Access Protocol (LDAP) [RFC 4510], the
   search operation [RFC 4511] supports requesting the return of a set of
   attributes.  This set is determined by a list of attribute
   descriptions.  Two special descriptors are defined to request all
   user attributes ("*") [RFC 4511] and all operational attributes ("+")
   [RFC 3673].  However, there is no convenient mechanism for requesting
   pre-defined sets of attributes such as the set of attributes used to
   represent a particular class of object.

Zeilenga                     Informational                      [Page 1]
RFC 4529 Requesting Attributes by Object Class June 2006 This document extends LDAP to allow an object class identifier to be specified in attributes lists, such as in Search requests, to request the return of all attributes belonging to an object class. The COMMERCIAL AT ("@", U+0040) character 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 is described in [RFC 4519]. This extension is intended primarily to be used where the user is in direct control of the parameters of the LDAP search operation, for instance when entering an LDAP URL [RFC 4516] into a web browser, such as <ldap:///dc=example,dc=com?@organization?base>. 2. Terminology In this document, the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as described in BCP 14 [RFC 2119]. 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 to be provided in the attributes field of the LDAP SearchRequest [RFC 4511] or other request values of the AttributeSelection data type (e.g., attributes field in pre/post read controls [ReadEntry]) and/or <attributeSelector> production (e.g., attributes of an LDAP URL [RFC 4516]). 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 "SUP"erior) [RFC 4512] were itself listed. This extension extends the <attributeSelector> [RFC 4511] production as indicated by the following ABNF [RFC 4234]: attributeSelector =/ objectclassdescription objectclassdescription = ATSIGN oid options ATSIGN = %x40 ; COMMERCIAL AT ("@" U+0040) where <oid> and <options> productions are as defined in [RFC 4512]. Zeilenga Informational [Page 2]
RFC 4529 Requesting Attributes by Object Class June 2006 The <oid> component of an <objectclassdescription> production identifies the object class by short name (descr) or object identifier (numericoid). If the value of the <oid> component is unrecognized or does not refer to an object class, the object class description is to be treated as an unrecognized attribute description. The <options> production is included in the grammar for extensibility purposes. An object class description with an unrecognized or inappropriate option is to be treated as unrecognized. Although object class description options and attribute description options share the same syntax, they are not semantically related. This document does not define any object description option. Servers supporting this feature SHOULD publish the object identifier (OID) 1.3.6.1.4.1.4203.1.5.2 as a value of the 'supportedFeatures' [RFC 4512] attribute in the root DSE. Clients supporting this feature SHOULD NOT use the feature unless they know that the server supports it. 4. Security Considerations This extension provides a shorthand for requesting all attributes of an object class. Because these attributes could have been listed individually, introduction of this shorthand is not believed to raise additional security considerations. Implementors of this LDAP extension should be familiar with security considerations applicable to the LDAP search operation [RFC 4511], as well as with general LDAP security considerations [RFC 4510]. 5. IANA Considerations Registration of the LDAP Protocol Mechanism [RFC 4520] defined in this document has been completed. Subject: Request for LDAP Protocol Mechanism Registration Object Identifier: 1.3.6.1.4.1.4203.1.5.2 Description: OC AD Lists Person & email address to contact for further information: Kurt Zeilenga <kurt@openldap.org> Usage: Feature Specification: RFC 4529 Author/Change Controller: Kurt Zeilenga <kurt@openldap.org> Comments: none Zeilenga Informational [Page 3]
RFC 4529 Requesting Attributes by Object Class June 2006 This OID was assigned [ASSIGN] by OpenLDAP Foundation, under its IANA-assigned private enterprise allocation [PRIVATE], for use in this specification. 6. References 6.1. Normative References [RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC 4234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234, October 2005. [RFC 4510] Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map", RFC 4510, June 2006. [RFC 4511] Sermersheim, J., Ed., "Lightweight Directory Access Protocol (LDAP): The Protocol", RFC 4511, June 2006. [RFC 4512] Zeilenga, K., "Lightweight Directory Access Protocol (LDAP): Directory Information Models", RFC 4512, June 2006. [RFC 4516] Smith, M., Ed. and T. Howes, "Lightweight Directory Access Protocol (LDAP): Uniform Resource Locator", RFC 4516, June 2006. [X.680] International Telecommunication Union - Telecommunication Standardization Sector, "Abstract Syntax Notation One (ASN.1) - Specification of Basic Notation", X.680(2002) (also ISO/IEC 8824-1:2002). 6.2. Informative References [RFC 3673] Zeilenga, K., "Lightweight Directory Access Protocol version 3 (LDAPv3): All Operational Attributes", RFC 3673, December 2003. [RFC 4519] Sciberras, A., Ed., "Lightweight Directory Access Protocol (LDAP): Schema for User Applications", RFC 4519, June 2006. [RFC 4520] Zeilenga, K., "Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)", BCP 64, RFC 4520, June 2006. Zeilenga Informational [Page 4]
RFC 4529 Requesting Attributes by Object Class June 2006 [ReadEntry] Zeilenga, K., "Lightweight Directory Access Protocol (LDAP) Read Entry Controls", RFC 4527, June 2006. [ASSIGN] OpenLDAP Foundation, "OpenLDAP OID Delegations", http://www.openldap.org/foundation/oid-delegate.txt. [PRIVATE] IANA, "Private Enterprise Numbers", http://www.iana.org/assignments/enterprise-numbers. Author's Address Kurt D. Zeilenga OpenLDAP Foundation EMail: Kurt@OpenLDAP.org Zeilenga Informational [Page 5]
RFC 4529 Requesting Attributes by Object Class June 2006 Full Copyright Statement Copyright (C) The Internet Society (2006). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Zeilenga Informational [Page 6]