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Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map

The information below is for an old version of the document that is already published as an RFC.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 4510.
Author Kurt Zeilenga
Last updated 2022-11-02 (Latest revision 2005-09-29)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Additional resources Mailing list discussion
Stream WG state (None)
Document shepherd (None)
IESG IESG state Became RFC 4510 (Proposed Standard)
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Responsible AD Ted Hardie
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INTERNET-DRAFT                              Editor: Kurt D. Zeilenga
Intended Category: Standard Track                OpenLDAP Foundation
Expires in six months                              30 September 2005
Obsoletes: RFC 2251-2256, 2829-2830, 3377, 3771

              Lightweight Directory Access Protocol (LDAP):
                     Technical Specification Road Map

Status of this Memo

  This document is intended to be published as a Standard Track RFC.
  Distribution of this memo is unlimited.  Technical discussion of this
  document will take place on the IETF LDAP Revision Working Group
  mailing list <>.  Please send editorial
  comments directly to the author <>.

  By submitting this Internet-Draft, each author represents that any
  applicable patent or other IPR claims of which he or she is aware have
  been or will be disclosed, and any of which he or she becomes aware
  will be disclosed, in accordance with Section 6 of BCP 79.

  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

  The list of Internet-Draft Shadow Directories can be accessed at

  Copyright (C) The Internet Society (2005).  All Rights Reserved.

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

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  The Lightweight Directory Access Protocol (LDAP) is an Internet
  protocol for accessing distributed directory services which act in
  accordance with X.500 data and service models.  This document provides
  a roadmap of the LDAP Technical Specification.


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

1. The LDAP Technical Specification

  The technical specification detailing version 3 of the Lightweight
  Directory Access Protocol (LDAP), an Internet Protocol, consists of
  this document and the following documents:

      LDAP: The Protocol [Protocol],
      LDAP: Directory Information Models [Models],
      LDAP: Authentication Methods and Connection Level Security
            Mechanisms [AuthMeth],
      LDAP: String Representation of Distinguished Names [LDAPDN],
      LDAP: String Representation of Search Filters [Filters],
      LDAP: Uniform Resource Locator [LDAPURL],
      LDAP: Syntaxes and Matching Rules [Syntaxes],
      LDAP: Internationalized String Preparation [LDAPprep], and
      LDAP: User Schema [Schema].

  The terms "LDAP" and "LDAPv3" are commonly used to informally refer to
  the protocol specified by this technical specification.  The LDAP
  suite, as defined here, should be formally identified in other
  documents by a normative reference to this document.

  LDAP is an extensible protocol.  Extensions to LDAP may be specified
  in other documents.  Nomenclature denoting such combinations of
  LDAP-plus-extension(s) is not defined by this document but may be
  defined in some future document(s).  Extensions are expected to be
  truly optional.

  IANA (Internet Assigned Numbers Authority) considerations for LDAP
  described in BCP 64 [BCP64bis] apply fully to this revision of the
  LDAP technical specification.

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2. Relationship to X.500

  This technical specification defines LDAP in terms of [X.500] as an
  X.500 access mechanism.  An LDAP server MUST act in accordance with
  X.500(1993) series of International Telecommunication Union - Telecom
  Standardization (ITU-T) Recommendations when providing the service.
  However, it is not required that an LDAP server make use of any X.500
  protocols in providing this service, e.g. LDAP can be mapped onto any
  other directory system so long as the X.500 data and service models
  [X.501][X.511] as used in LDAP is not violated in the LDAP interface.

  This technical specification explicitly incorporates portions of
  X.500(93).  Later revisions of X.500 do not automatically apply to
  this technical specification.

3. Relationship to Obsolete Specifications

  This technical specification, as defined in Section 1, obsoletes
  entirely the previously defined LDAP technical specification [RFC3377]
  (which consists of RFC 2251-2256, RFC 2829-2830, RFC 3771, and RFC
  3377 itself).  The technical specification was significantly

  This document replaces RFC 3377 as well as Section 3.3 of RFC 2251.
  [Models] replaces portions of RFC 2251, RFC 2252 and RFC 2256.
  [Protocol] replaces the majority RFC 2251, portions of RFC 2252, and
  all of RFC 3771.  [AuthMeth] replaces RFC 2829, RFC 2830, and portions
  of RFC 2251.  [Syntaxes] replaces the majority of RFC 2252 and
  portions of RFC 2256.  [Schema] replaces the majority of RFC 2256.
  [LDAPDN] replaces RFC 2253.  [Filters] replaces RFC 2254.  [LDAPURL]
  replaces RFC 2255.

  [LDAPprep] is new to this revision of the LDAP technical

  Each document of this specification contains appendices summarizing
  changes to all sections of the specifications they replace.  Appendix
  A.1 of this document details changes made to RFC 3377.  Appendix A.2
  of this document details changes made to Section 3.3 of RFC 2251.

  Additionally, portions of this technical specification update and/or
  replace a number of other documents not listed above.  These
  relationships are discussed in the documents detailings these portions
  of this technical specification.

4. Security Considerations

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  LDAP security considerations are discussed in each document comprising
  the technical specification.

5. IANA Considerations

  No actions.

  [[Note to RFC Editor: this section may be removed prior to

6. Acknowledgments

  This document is based largely on RFC 3377 by J. Hodges and R.
  Morgan, a product of the LDAPBIS and LDAPEXT Working Groups.  The
  document also borrows from RFC 2251 by M. Wahl, T. Howes, and S.
  Kille, a product of the ASID Working Group.

  This document is a product of the IETF LDAPBIS Working Group.

7. Author's Address

  Kurt D. Zeilenga
  OpenLDAP Foundation


8. References

  [[Note to the RFC Editor: please replace the citation tags used in
  referencing Internet-Drafts with tags of the form RFCnnnn where

8.1. Normative References

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

  [BCP64bis]    Zeilenga, K., "IANA Considerations for LDAP",
                draft-ietf-ldapbis-bcp64-xx.txt, a work in progress.

  [Protocol]    Sermersheim, J. (editor), "LDAP: The Protocol",
                draft-ietf-ldapbis-protocol-xx.txt, a work in progress.

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  [Models]      Zeilenga, K. (editor), "LDAP: Directory Information
                Models", draft-ietf-ldapbis-models-xx.txt, a work in

  [AuthMeth]    Harrison, R. (editor), "LDAP: Authentication Methods and
                Connection Level Security Mechanisms",
                draft-ietf-ldapbis-authmeth-xx.txt, a work in progress.

  [LDAPDN]      Zeilenga, K. (editor), "LDAP: String Representation of
                Distinguished Names", draft-ietf-ldapbis-dn-xx.txt, a
                work in progress.

  [Filters]     Smith, M. (editor), LDAPbis WG, "LDAP: String
                Representation of Search Filters",
                draft-ietf-ldapbis-filter-xx.txt, a work in progress.

  [LDAPURL]     Smith, M. (editor), "LDAP: Uniform Resource Locator",
                draft-ietf-ldapbis-url-xx.txt, a work in progress.

  [Syntaxes]    Legg, S. (editor), "LDAP: Syntaxes and Matching Rules",
                draft-ietf-ldapbis-syntaxes-xx.txt, a work in progress.

  [LDAPprep]    Zeilenga, K., "LDAP: Internationalized String
                Preparation", draft-ietf-ldapbis-strprep-xx.txt, a work
                in progress.

  [Schema]      Dally, K. (editor), "LDAP: User Schema",
                draft-ietf-ldapbis-user-schema-xx.txt, a work in

  [X.500]       International Telecommunication Union -
                Telecommunication Standardization Sector, "The Directory
                -- Overview of concepts, models and services,"
                X.500(1993) (also ISO/IEC 9594-1:1994).

  [X.501]       International Telecommunication Union -
                Telecommunication Standardization Sector, "The Directory
                -- Models," X.501(1993) (also ISO/IEC 9594-2:1994).

  [X.511]       International Telecommunication Union -
                Telecommunication Standardization Sector, "The
                Directory: Abstract Service Definition", X.511(1993)
                (also ISO/IEC 9594-3:1993).

8.2. Informative References


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Appendix A.  Changes to Previous Documents

  This appendix outlines changes this document makes relative to the
  documents it replaces (in whole or in part).

Appendix A.1. Changes to RFC 3377

  This document is nearly a complete rewrite of RFC 3377 as much of the
  material of RFC 3377 is no longer applicable.  The changes include
  redefining the terms "LDAP" and "LDAPv3" to refer to this revision of
  the technical specification.

Appendix A.2. Changes to Section 3.3 of RFC 2251

  The section was modified slightly (the word "document" was replaced
  with "technical specification") to clarify that it applies to the
  entire LDAP technical specification.

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  pertain to the implementation or use of the technology described in
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  Copies of IPR disclosures made to the IETF Secretariat and any
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  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

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Full Copyright

  Copyright (C) The Internet Society (2005).

  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

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