INTERNET-DRAFT Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
Expires in six months 18 July 2005
The LDAP entryUUID operational attribute
<draft-zeilenga-ldap-uuid-06.txt>
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Abstract
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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.
1. Background and Intended Use
In X.500 Directory Services [X.501], such as those accessible using
the Lightweight Directory Access Protocol (LDAP) [Roadmap], 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.
A Universally Unique Identifier (UUID) is "an identifier unique across
both space and time, with respect to the space of all UUIDs"
[UUIDURN]. UUIDs are used in a wide range of systems.
This document describes the 'entryUUID' operational attribute which
holds the UUID assigned to the object by the server. Clients may use
this attribute to distinguish objects identified by a particular
distinguished name or to locate a particular object after renaming.
This document defines the UUID syntax, the 'uuidMatch' and
'uuidOrderingMatch' matching rules, and the 'entryUUID' attribute
type.
Schema definitions are provided using LDAP description formats
[Models]. Definitions provided here are formatted (line wrapped) for
readability.
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].
2. UUID Schema Elements
2.1 UUID Syntax
A Universally Unique Identifier (UUID) [UUIDURN] is a 16-octet
(128-bit) value which identifies an object. The ASN.1 [X.680] type
UUID is defined to represent UUIDs as follows:
UUID ::= OCTET STRING (SIZE(16))
-- constrained to an UUID [UUIDURN]
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In LDAP, UUID values are encoded using the [ASCII] character string
representation described in [UUIDURN]. For example,
"597ae2f6-16a6-1027-98f4-d28b5365dc14".
The following is a LDAP syntax description suitable for publication in
subschema subentries.
( 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 the 'octetStringMatch'
[X.520][Syntaxes] 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 suitable for
publication in subschema subentries.
( 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][Syntaxes] 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 suitable for
publication in subschema subentries.
( IANA-ASSIGNED-OID.3 NAME 'uuidOrderingMatch'
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
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The 'entryUUID' operational attribute provides the Universally Unique
Identifier (UUID) assigned to the entry.
The following is a LDAP attribute type description suitable for
publication in subschema subentries.
( 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 generate and assign a new UUID to each entry upon its
addition to the directory and provide that UUID as the value of the
'entryUUID' operational attribute. An entry's UUID is immutable.
UUID are to be generated in accordance with Section 4 of [UUIDURN].
In particular, servers MUST ensure that each generated UUID is unique
in space and time.
3. Security Considerations
An entry's relative distinguish name (RDN) is composed from attribute
values of the entry, values which are commonly descriptive of the
object the entry represents. While deployers are encouraged to use
naming attributes whose values are widely disclosable [LDAPDN],
entries are often named using information which cannot be disclosed to
all parties. As UUIDs do not contain any descriptive information of
the object they identify, UUIDs may be used to identify a particular
entry without disclosure of its contents.
General UUID security considerations [UUIDURN] apply.
General LDAP security considerations [RFC3377] apply.
4. IANA Considerations
It is requested that IANA register upon Standards Action the LDAP
values specified in this document.
4.1. Object Identifier Registration
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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. UUID Syntax Registration
Subject: Request for LDAP Syntax Registration
Object Identifier: IANA-ASSIGNED-OID.1
Description: UUID
Person & email address to contact for further information:
Kurt Zeilenga <kurt@OpenLDAP.org>
Specification: RFC XXXX
Author/Change Controller: IESG
Comments:
Identifies the UUID syntax
4.3. 'uuidMatch' Descriptor Registration
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. 'uuidOrderingMatch' Descriptor Registration
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
5.4. 'entryUUID' Descriptor Registration
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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
6. Acknowledgments
This document is based upon discussions in the LDAP Update and
Duplication Protocols (LDUP) WG. Members of the LDAP Directorate
provided review.
7. Author's Address
Kurt D. Zeilenga
OpenLDAP Foundation
Email: Kurt@OpenLDAP.org
8. References
[[Note to the RFC Editor: please replace the citation tags used in
referencing Internet-Drafts with tags of the form RFCnnnn where
possible.]]
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14 (also RFC 2119), March 1997.
[Roadmap] Zeilenga, K. (editor), "LDAP: Technical Specification
Road Map", draft-ietf-ldapbis-roadmap-xx.txt, a work in
progress.
[UUIDURN] Leach, P, M. Mealling, R. Salz, "A UUID URN Namespace",
a work in progress.
[Models] Zeilenga, K. (editor), "LDAP: Directory Information
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Models", draft-ietf-ldapbis-models-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.
[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(2002) (also ISO/IEC 8824-1:2002).
8.2. Informative References
[LDAPDN] Zeilenga, K. (editor), "LDAP: String Representation of
Distinguished Names", draft-ietf-ldapbis-dn-xx.txt, a
work in progress.
[BCP64bis] Zeilenga, K., "IANA Considerations for LDAP",
draft-ietf-ldapbis-bcp64-xx.txt, a work in progress.
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