INTERNET-DRAFT Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
Expires in six months 11 May 2003
The LDAP entryUUID operational attribute
<draft-zeilenga-ldap-uuid-00.txt>
Status of this Memo
This document is an Internet-Draft and is in full conformance with all
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Copyright (C) The Internet Society (2003). All Rights Reserved.
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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 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 value
which identifies object. The ASN.1 [X.690] type UUID is defined to
represent UUIDs.
UUID ::= OCTET STRING{16} -- constrained to an UUID [ISO 11578]
In LDAP, values of the UUID are encoded using the string
representation described in [ISO11578]. For example,
597ae2f6-16a6-1027-98f4-d28b5365dc14.
( IANA-ASSIGNED-OID.1 DESC 'UUID' )
2.2 'uuidMatch' Matching Rule
The 'uuidMatch' matching rule compares an asserted UUID with a stored
UUID for equality. Its semantics are same as octetStringMatch
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[X.520][RFC2252].
( 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
octetStringOrderingMatch [X.520][RFC2252].
( IANA-ASSIGNED-OID.3 NAME 'uuidMatch'
SYNTAX IANA-ASSIGNED-OID.1 )
2.4. 'entryUUID' attribute
The 'entryUUID' operational attribute provides the Universally Unique
Identifier (UUID) [ISO11578] assigned to the entry.
( IANA-ASSIGNED-OID.4 NAME 'entryUUID'
DESC 'UUID of the entry'
EQUALITY uuidMatch
ORDERING uuidOrderingMatch
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
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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
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
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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.
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.
[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.
[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 -
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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" section
of "CDE 1.1: Remote Procedure Calls",
<http://www.opengroup.org/onlinepubs/9629399/apdxa.htm>,
April 1997.
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