One document matched: draft-zeilenga-ldap-uuid-03.txt
Differences from draft-zeilenga-ldap-uuid-02.txt
INTERNET-DRAFT Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
Expires in six months 3 February 2004
The LDAP entryUUID operational attribute
<draft-zeilenga-ldap-uuid-03.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>.
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Copyright (C) The Internet Society (2004). 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 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 [ISO11578]
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' )
2.2 'uuidMatch' Matching Rule
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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
SYNTAX IANA-ASSIGNED-OID.1
SINGLE-VALUE
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NO-USER-MODIFICATION
USAGE directoryOperation )
Servers SHALL assign a 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.
3. Security Considerations
Use of UUIDs to identify entries, especially in authentication,
authorization, and related applications, offers a number of benefits
of use of DNs. For instance DNs, aside from not being stable, often
contain sensitive information. Designers of directory applications
should consider using UUID to identify entries.
Servers should ensure that all 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>
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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
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
Email: Kurt@OpenLDAP.org
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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.
[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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