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openldap/doc/drafts/draft-zeilenga-ldap-collective-xx.txt
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INTERNET-DRAFT Editor: Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
Expires in six months 18 August 2002
Collective Attributes in LDAP
<draft-zeilenga-ldap-collective-08.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 a Standard Track document.
Distribution of this memo is unlimited. Technical discussion of this
document will take place on the IETF LDAP Extension Working Group
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
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
<http://www.ietf.org/ietf/1id-abstracts.txt>. The list of
Internet-Draft Shadow Directories can be accessed at
<http://www.ietf.org/shadow.html>.
Copyright 2002, The Internet Society. All Rights Reserved.
Please see the Copyright section near the end of this document for
more information.
Abstract
X.500 collective attributes allow common characteristics to be shared
between collections of entries. This document summarizes the X.500
information model for collective attributes and describes use of
collective attributes in LDAP (Lightweight Directory Access Protocol).
This document provides schema definitions for collective attributes
for use in LDAP.
Zeilenga draft-zeilenga-ldap-collective-08 [Page 1]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
Conventions
Schema definitions are provided using LDAPv3 description formats
[RFC2252]. 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].
1. Introduction
In X.500, a collective attribute is "a user attribute whose values are
the same for each member of an entry collection" [X.501]. This
document details their use in the Lightweight Directory Access
Protocol (LDAP) [LDAPTS].
1.1. Entry Collections
A collection of entries is a grouping of object and alias entries
based upon common properties or shared relationship between the
corresponding entries which share certain attributes. An entry
collection consists of all entries within scope of a collective
attributes subentry [SUBENTRY]. An entry can belong to several entry
collections.
1.2. Collective Attributes
Attributes shared by the entries comprising an entry collection are
called collective attributes. Values of collective attributes are
visible but not updateable to clients accessing entries within the
collection. Collective attributes are updated (i.e. modified) via
their associated collective attributes subentry.
When an entry belongs to multiple entry collections, the entry's
values of each collective attribute are combined such that independent
sources of these values are not manifested to clients.
Entries can specifically exclude a particular collective attribute by
listing the attribute as a value of the collectiveExclusions
attribute. Like other user attributes, collective attributes are
subject to a variety of controls including access, administrative, and
content controls.
Zeilenga draft-zeilenga-ldap-collective-08 [Page 2]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
2. System Schema for Collective Attributes
The following operational attributes are used to manage Collective
Attributes. LDAP servers [LDAPTS] MUST act in accordance with the
X.500 Directory Models [X.501] when providing this service.
2.1. collectiveAttributeSubentry
Subentries of this object class are used to administer collective
attributes and are referred to as collective attribute subentries.
( 2.5.20.2 NAME 'collectiveAttributeSubentry' AUXILIARY )
A collective attribute subentry SHOULD contain at least one collective
attribute. The collective attributes contained within a collective
attribute subentry are available for finding, searching, and
comparison at every entry within the scope of the subentry. The
collective attributes, however, are administered (e.g. modified) via
the subentry.
Implementations of this specification SHOULD support collective
attribute subentries in both collectiveAttributeSpecificArea
(2.5.23.5) and collectiveAttributeInnerArea (2.5.23.6) administrative
areas [SUBENTRY][X.501].
2.2. collectiveAttributeSubentries
The collectiveAttributeSubentries operational attribute identifies all
collective attribute subentries that affect the entry.
( 2.5.18.12 NAME 'collectiveAttributeSubentries'
EQUALITY distinguishedNameMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
USAGE directoryOperation NO-USER-MODIFICATION )
2.3. collectiveExclusions
The collectiveExclusions operational attribute allows particular
collective attributes to be excluded from an entry. It MAY appear in
any entry and MAY have multiple values.
( 2.5.18.7 NAME 'collectiveExclusions'
EQUALITY objectIdentifierMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38
USAGE directoryOperation )
Zeilenga draft-zeilenga-ldap-collective-08 [Page 3]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
The descriptor excludeAllCollectiveAttributes is associated with the
OID 2.5.18.0. When this descriptor or OID is present as a value of
the collectiveExclusions attribute, all collective attributes are
excluded from an entry.
3. Collective Attribute Types
A userApplications attribute type can be defined to be COLLECTIVE
[RFC2252]. This indicates that the same attribute values will appear
in the entries of an entry collection subject to the use of the
collectiveExclusions attribute and other administrative controls.
These administrative controls MAY include DIT Content Rules, if
implemented.
Collective attribute types are commonly defined as subtypes of non-
collective attribute types. By convention, collective attributes are
named by prefixing the name of their non-collective supertype with
"c-". For example, the collective telephone attribute is named
c-TelephoneNumber after its non-collective supertype telephoneNumber.
Non-collective attributes types SHALL NOT subtype collective
attributes.
Collective attributes SHALL NOT be SINGLE-VALUED. Collective
attribute types SHALL NOT appear in the attribute types of an object
class definition.
Operational attributes SHALL NOT be defined to be collective.
The remainder of section provides a summary of collective attributes
derived from those defined in [X.520]. The SUPerior attribute types
are described in [RFC 2256] for use with LDAP.
Implementations of this specification SHOULD support the following
collective attributes and MAY support additional collective
attributes.
3.1. Collective Locality Name
The c-l attribute type specifies a locality name for a collection of
entries.
( 2.5.4.7.1 NAME 'c-l'
SUP l COLLECTIVE )
Zeilenga draft-zeilenga-ldap-collective-08 [Page 4]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
3.2. Collective State or Province Name
The c-st attribute type specifies a state or province name for a
collection of entries.
( 2.5.4.8.1 NAME 'c-st'
SUP st COLLECTIVE )
3.3. Collective Street Address
The c-street attribute type specifies a street address for a
collection of entries.
( 2.5.4.9.1 NAME 'c-street'
SUP street COLLECTIVE )
3.4. Collective Organization Name
The c-o attribute type specifies an organization name for a collection
of entries.
( 2.5.4.10.1 NAME 'c-o'
SUP o COLLECTIVE )
3.5. Collective Organizational Unit Name
The c-ou attribute type specifies an organizational unit name for a
collection of entries.
( 2.5.4.11.1 NAME 'c-ou'
SUP ou COLLECTIVE )
3.6. Collective Postal Address
The c-PostalAddress attribute type specifies a postal address for a
collection of entries.
( 2.5.4.16.1 NAME 'c-PostalAddress'
SUP postalAddress COLLECTIVE )
3.7. Collective Postal Code
The c-PostalCode attribute type specifies a postal code for a
Zeilenga draft-zeilenga-ldap-collective-08 [Page 5]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
collection of entries.
( 2.5.4.17.1 NAME 'c-PostalCode'
SUP postalCode COLLECTIVE )
3.8. Collective Post Office Box
The c-PostOfficeBox attribute type specifies a post office box for a
collection of entries.
( 2.5.4.18.1 NAME 'c-PostOfficeBox'
SUP postOfficeBox COLLECTIVE )
3.9. Collective Physical Delivery Office Name
The c-PhysicalDeliveryOfficeName attribute type specifies a physical
delivery office name for a collection of entries.
( 2.5.4.19.1 NAME 'c-PhysicalDeliveryOfficeName'
SUP physicalDeliveryOfficeName COLLECTIVE )
3.10. Collective Telephone Number
The c-TelephoneNumber attribute type specifies a telephone number for
a collection of entries.
( 2.5.4.20.1 NAME 'c-TelephoneNumber'
SUP telephoneNumber COLLECTIVE )
3.11. Collective Telex Number
The c-TelexNumber attribute type specifies a telex number for a
collection of entries.
( 2.5.4.21.1 NAME 'c-TelexNumber'
SUP telexNumber COLLECTIVE )
3.13. Collective Facsimile Telephone Number
The c-FacsimileTelephoneNumber attribute type specifies a facsimile
telephone number for a collection of entries.
( 2.5.4.23.1 NAME 'c-FacsimileTelephoneNumber'
Zeilenga draft-zeilenga-ldap-collective-08 [Page 6]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
SUP facsimileTelephoneNumber COLLECTIVE )
3.14. Collective International ISDN Number
The c-InternationalISDNNumber attribute type specifies an
international ISDN number for a collection of entries.
( 2.5.4.25.1 NAME 'c-InternationalISDNNumber'
SUP internationalISDNNumber COLLECTIVE )
4. Security Considerations
Collective attributes, like other attributes, are subject to access
control restrictions and other administrative policy. Generally
speaking, collective attributes accessed via an entry in a collection
are governed by rules restricting access to attributes of that entry.
And collective attributes access via a subentry are governed by rules
restricting access to attributes of that subentry. However, as LDAP
does not have a standard access model, the particulars of each
server's access control system may differ.
General LDAP security considerations [LDAPTS] also apply.
5. IANA Considerations
It is requested that IANA register upon Standards Action the LDAP
descriptors [LDAPIANA] defined in this technical specification. The
following registration template is suggested:
Subject: Request for LDAP Descriptor Registration
Descriptor see comments
Object Identifier: see comment
Person & email address to contact for further information:
Kurt Zeilenga <kurt@OpenLDAP.org>
Usage: see comment
Specification: RFCXXXX
Author/Change Controller: IESG
Comments:
NAME Type OID
------------------------ ---- -----------------
c-FacsimileTelephoneNumber A 2.5.4.23.1
c-InternationalISDNNumber A 2.5.4.25.1
c-PhysicalDeliveryOffice A 2.5.4.19.1
c-PostOfficeBox A 2.5.4.18.1
Zeilenga draft-zeilenga-ldap-collective-08 [Page 7]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
c-PostalAddress A 2.5.4.16.1
c-PostalCode A 2.5.4.17.1
c-TelephoneNumber A 2.5.4.20.1
c-TelexNumber A 2.5.4.21.1
c-l A 2.5.4.7.1
c-o A 2.5.4.10.1
c-ou A 2.5.4.11.1
c-st A 2.5.4.8.1
c-street A 2.5.4.9.1
collectiveAttributeSubentries A 2.5.18.12
collectiveAttributeSubentry O 2.5.20.2
collectiveExclusions A 2.5.18.7
where Type A is Attribute and Type O is ObjectClass.
The Object Identifiers used in this document were assigned by the
ISO/IEC Joint Technical Committee 1 - Subcommitte 6 to identify
elements of X.500 schema [X.520]. This document make no OID
assignments, it only provides LDAP schema descriptions with existing
elements of X.500 schema.
6. Acknowledgments
This document is based upon the ITU Recommendations for the Directory
[X.501][X.520].
7. Author's Address
Kurt D. Zeilenga
OpenLDAP Foundation
<Kurt@OpenLDAP.org>
8. Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14 (also RFC 2119), March 1997.
[RFC2251] M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
Protocol (v3)", RFC 2251, December 1997.
[RFC2252] M. Wahl, A. Coulbeck, T. Howes, S. Kille, "Lightweight
Directory Access Protocol (v3): Attribute Syntax
Definitions", RFC 2252, December 1997.
Zeilenga draft-zeilenga-ldap-collective-08 [Page 8]
INTERNET-DRAFT LDAP Collective Attributes 18 August 2002
[RFC2256] M. Wahl, "A Summary of the X.500(96) User Schema for use
with LDAPv3", RFC 2256, December 1997.
[LDAPTS] J. Hodges, R.L. Morgan, "Lightweight Directory Access
Protocol (v3): Technical Specification",
draft-ietf-ldapbis-ldapv3-ts-xx.txt.
[SUBENTRY] K. Zeilenga, S. Legg, "Subentries in LDAP",
draft-zeilenga-ldap-subentry-xx.txt, a work in progress.
[X.501] "The Directory: Models", ITU-T Recommendation X.501, 1993.
9. Informative References
[X.500] "The Directory: Overview of Concepts, Models", ITU-T
Recommendation X.500, 1993.
[X.520] "The Directory: Selected Attribute Types", ITU-T
Recommendation X.520, 1993.
Copyright 2002, The Internet Society. All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be followed,
or as required to translate it into languages other than English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE AUTHORS, THE INTERNET SOCIETY, AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Zeilenga draft-zeilenga-ldap-collective-08 [Page 9]
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