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Versions: 00 01 02 03 04 05 06 RFC 4530

INTERNET-DRAFT                                      Kurt D. Zeilenga
Intended Category: Standard Track                   OpenLDAP Foundation
Expires in six months                               25 October 2003


                 The LDAP entryUUID operational attribute
                    <draft-zeilenga-ldap-uuid-02.txt>


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 Standard Track 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
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  The list of current Internet-Drafts can be accessed at
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  Copyright (C) The Internet Society (2003).  All Rights Reserved.

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


Abstract

  This document describes the LDAP/X.500 'entryUUID' operational
  attribute and associated matching rules and syntax.  The attribute
  holds a server-assigned Universally Unique Identifier (UUID) for the
  object.  Directory clients may use this attribute to distinguish
  objects identified by a distinguished name or to locate an object
  after renaming.



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1. Background and Intended Use

  In X.500 Directory Services [X.501], such as those accessible using
  the the Lightweight Directory Access Protocol (LDAP) [RFC3377], an
  object is identified by its distinguished name (DN).  However, DNs are
  not stable identifiers.  That is, a new object may be identified by a
  DN which previously identified another (now renamed or deleted)
  object.

  This document describes the 'entryUUID' operational attribute which
  holds the Universally Unique Identifier (UUID) [ISO11578] assigned to
  the object by the server.  Clients may use this attribute to
  distinguish objects identified by a distinguished name or to locate an
  object after renaming.

  This document defines the UUID syntax, the 'uuidMatch' and
  'uuidOrderingMatch' matching rules, the 'entryUUID' attribute type.

  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
  "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
  document are to be interpreted as described in BCP 14 [RFC2119].

  Schema definitions are provided using LDAP description formats
  [RFC2252].  Definitions provided here are formatted (line wrapped) for
  readability.


2. UUID Schema Elements

2.1 UUID Syntax

  A Universally Unique Identifier (UUID) [ISO11578] is a 16-octet
  (128-bit) value which identifies an object.  The ASN.1 [X.690] type
  UUID is defined to represent UUIDs.

      UUID ::= OCTET STRING (SIZE(16))
            -- constrained to an UUID [ISO 11578]

  In LDAP, values of the UUID type are encoded using the [ASCII]
  character string representation described in [ISO11578].  For example,
  "597ae2f6-16a6-1027-98f4-d28b5365dc14".

  The following is a LDAP syntax description [RFC2252] suitable for
  publication in the subschema.

      ( IANA-ASSIGNED-OID.1 DESC 'UUID' )





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2.2 'uuidMatch' Matching Rule

  The 'uuidMatch' matching rule compares an asserted UUID with a stored
  UUID for equality.  Its semantics are same as the octetStringMatch
  [X.520][RFC2252] matching rule.   The rule differs from
  octetStringMatch in that the assertion value is encoded using the UUID
  string representation instead of the normal OCTET STRING string
  representation.

  The following is a LDAP matching rule description [RFC2252] suitable
  for publication in the subschema.

      ( IANA-ASSIGNED-OID.2 NAME 'uuidMatch'
          SYNTAX IANA-ASSIGNED-OID.1 )


2.3 'uuidOrderingMatch' Matching Rule

  The 'uuidOrderingMatch' matching rule compares an asserted UUID
  with a stored UUID for ordering.  Its semantics are the same as the
  octetStringOrderingMatch [X.520][RFC2252] matching rule.  The rule
  differs from octetStringOrderingMatch in that the assertion value
  is encoded using the UUID string representation instead of the
  normal OCTET STRING string representation.

  The following is a LDAP matching rule description [RFC2252] suitable
  for publication in the subschema.

      ( IANA-ASSIGNED-OID.3 NAME 'uuidMatch'
          SYNTAX IANA-ASSIGNED-OID.1 )

  It is noted that not all UUID variants have a defined ordering and,
  even where so, servers are not obligated to assign UUIDs in any
  particular order.  This matching rule is provided for completeness.


2.4. 'entryUUID' attribute

  The 'entryUUID' operational attribute provides the Universally Unique
  Identifier (UUID) [ISO11578] assigned to the entry.

  The following is a LDAP attribute type description [RFC2252] suitable
  for publication in the subschema.

      ( IANA-ASSIGNED-OID.4 NAME 'entryUUID'
          DESC 'UUID of the entry'
          EQUALITY uuidMatch
          ORDERING uuidOrderingMatch



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          SYNTAX IANA-ASSIGNED-OID.1
          SINGLE-VALUE
          NO-USER-MODIFICATION
          USAGE directoryOperation )

  Servers SHALL assign a UUID to each entry upon its addition to the
  directory  and provide the entry's UUID as the value of the
  'entryUUID' operational attribute.  An entry's UUID is immutable.


3. Security Considerations

  Servers should ensure that components of UUID values are publicly
  disclosable.

  General LDAP security considerations [RFC3377] apply.


4. IANA Considerations

4.1. Object Identifier Registration

  It is requested that IANA register upon Standards Action an LDAP
  Object Identifier for use in this technical specification.

      Subject: Request for LDAP OID Registration
      Person & email address to contact for further information:
          Kurt Zeilenga <kurt@OpenLDAP.org>
      Specification: RFC XXXX
      Author/Change Controller: IESG
      Comments:
          Identifies the UUID schema elements


4.2. Registration of the uuidMatch descriptor

  It is requested that IANA register upon Standards Action the LDAP
  'uuidMatch' descriptor.

      Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): uuidMatch
      Object Identifier: IANA-ASSIGNED-OID.2
      Person & email address to contact for further information:
          Kurt Zeilenga <kurt@OpenLDAP.org>
      Usage: Matching Rule
      Specification: RFC XXXX
      Author/Change Controller: IESG




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4.3. Registration of the uuidOrderingMatch descriptor

  It is requested that IANA register upon Standards Action the LDAP
  'uuidOrderingMatch' descriptor.

      Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): uuidOrderingMatch
      Object Identifier: IANA-ASSIGNED-OID.3
      Person & email address to contact for further information:
          Kurt Zeilenga <kurt@OpenLDAP.org>
      Usage: Matching Rule
      Specification: RFC XXXX
      Author/Change Controller: IESG


4.4. Registration of the entryUUID descriptor

  It is requested that IANA register upon Standards Action the LDAP
  'entryUUID' descriptor.

      Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): entryUUID
      Object Identifier: IANA-ASSIGNED-OID.4
      Person & email address to contact for further information:
          Kurt Zeilenga <kurt@OpenLDAP.org>
      Usage: Attribute Type
      Specification: RFC XXXX
      Author/Change Controller: IESG


5. Acknowledgments

  This document is based upon discussions in the LDAP Update and
  Duplication Protocols (LDUP) WG.  Members of the concluded LDAP
  Extensions (LDAPEXT) Working Group provided review.


6. Author's Address

  Kurt D. Zeilenga
  OpenLDAP Foundation
  <Kurt@OpenLDAP.org>


7. Normative References

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



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  [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.

  [ISO11578]    International Organization for Standardization,
                "Information technology - Open Systems Interconnection -
                Remote Procedure Call", ISO/IEC 11578:1996.

  [ASCII]       Coded Character Set--7-bit American Standard Code for
                Information Interchange, ANSI X3.4-1986.

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

  [X.520]       International Telecommunication Union -
                Telecommunication Standardization Sector, "The
                Directory: Selected Attribute Types", X.520(1993) (also
                ISO/IEC 9594-6:1994).

  [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).


8. Informative References

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

  [UUIDinfo]    The Open Group, "Universally Unique Identifier" appendix
                of the CAE Specification "DCE 1.1: Remote Procedure
                Calls", Document Number C706,
                <http://www.opengroup.org/products/publications/catalog/c706.htm>
                (appendix available at:
                <http://www.opengroup.org/onlinepubs/9629399/apdxa.htm>),
                August 1997.



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Full Copyright

  Copyright (C) The Internet Society (2003). All Rights Reserved.

  This document and translations of it may be copied and furnished to
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