openldap/doc/drafts/draft-zeilenga-ldap-opattrs-xx.txt

INTERNET-DRAFT                                      Kurt D. Zeilenga
Intended Category: Standard Track                   OpenLDAP Foundation
Expires in six months                               1 November 2002



                    LDAPv3: All Operational Attributes
                   <draft-zeilenga-ldap-opattrs-05.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 Extensions 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
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  Copyright 2002, The Internet Society.  All Rights Reserved.

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


Abstract

  The Lightweight Directory Access Protocol (LDAP) supports a mechanism
  for requesting the return of all user attributes but not all
  operational attributes.   This document describes an LDAP extension
  which clients may use to request the return of all operational
  attributes.



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1.  Overview

  X.500 [X.500] provides a mechanism for clients to request all
  operational attributes be returned with entries provided in response
  to a search operation.   This mechanism is often used by clients to
  discover which operational attributes are present in an entry.

  This documents extends the Lightweight Directory Access Protocol
  (LDAP) [RFC3377] to provide a simple mechanism which clients may use
  to request the return of all operational attributes.  The mechanism is
  designed for use with existing general purpose LDAP clients (including
  web browsers which support LDAP URLs) and existing LDAP APIs.

  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.  All Operational Attributes

  The presence of the attribute description "+" (ASCII 43) in the list
  of attributes in a Search Request [RFC2251] SHALL signify a request
  for the return of all operational attributes.

  As with all search requests, client implementors should note that
  results may not include all requested attributes due to access
  controls or other restrictions.  Client implementors should also note
  that certain operational attributes may be returned only if requested
  by name even when "+" is present.  This is because some operational
  attributes are very expensive to return.

  Servers supporting this feature SHOULD publish the Object Identifier
  1.3.6.1.4.1.4203.1.5.1 as a value of the 'supportedFeatures'
  [FEATURES] attribute in the root DSE.


3.  Interoperability Considerations

  This mechanism is specifically designed to allow users to request all
  operational attributes using existing LDAP clients.  In particular,
  the mechanism is designed to be compatible with existing general
  purpose LDAP clients including those supporting LDAP URLs [RFC2255].

  The addition of this mechanism to LDAP is not believed to cause any
  significant interoperability issues (this has been confirmed through
  testing).  Servers which have yet to implement this specification
  should ignore the "+" as an unrecognized attribute description per
  [RFC2251, Section 4.5.1].  From the client's perspective, a server



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  which does not return all operational attributes when "+" is requested
  should be viewed as having other restrictions.

  It is also noted that this mechanism is believed to require no
  modification of existing LDAP APIs.


4.  Security Considerations

  This document provides a general mechanism which clients may use to
  discover operational attributes.  Prior to the introduction of this
  mechanism, operational attributes where only returned when requested
  by name.  Some might have viewed this as obscurity" feature.  However,
  this sense of security as the attributes were still transferable.

  Implementations SHOULD implement appropriate access controls
  mechanisms to restricts access to operational attributes.


5.  IANA Considerations

  This document uses the OID 1.3.6.1.4.1.4203.1.5.1 to identify the
  feature described above.  This OID was assigned [ASSIGN] by OpenLDAP
  Foundation, under its IANA-assigned private enterprise allocation
  [PRIVATE], for use in this specification.

  Registration of this feature is requested [FEATURES][RFC3383].

  Subject: Request for LDAP Protocol Mechanism Registration

  Object Identifier: 1.3.6.1.4.1.4203.1.5.1

  Description: All Op Attrs

  Person & email address to contact for further information:
       Kurt Zeilenga <kurt@openldap.org>

  Usage: Feature

  Specification: RFCxxxx

  Author/Change Controller: IESG

  Comments: none


6.  Acknowledgment




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  The "+" mechanism is believed to have been first suggested by Bruce
  Greenblatt in a November 1998 post to the IETF LDAPext Working Group
  mailing list.


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.

  [RFC3377] J. Hodges, R. Morgan, "Lightweight Directory Access Protocol
            (v3): Technical Specification", RFC 3377, September 2002.

  [FEATURES] K. Zeilenga, "Feature Discovery in LDAP", draft-zeilenga-
            ldap-features-xx.txt (a work in progress).


9. Informative References

  [RFC2255] T. Howes and M. Smith, "The LDAP URL Format", RFC 2255,
            December 1997.

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

  [X.500]   ITU-T Rec. X.500, "The Directory: Overview of Concepts,
            Models and Service", 1993.

  [ASSIGN]  OpenLDAP Foundation, "OpenLDAP OID Delegations",
            http://www.openldap.org/foundation/oid-delegate.txt.

  [PRIVATE] IANA, "Private Enterprise Numbers",
            http://www.iana.org/assignments/enterprise-numbers.


Copyright 2002, The Internet Society.  All Rights Reserved.

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



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  others, and derivative works that comment on or otherwise explain it
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