The Lightweight Directory Access Protocol (LDAP) entryDN Operational Attribute
draft-zeilenga-ldap-entrydn-02

INTERNET-DRAFT                                      Kurt D. Zeilenga
Intended Category: Standard Track                   Isode Limited
Expires in six months                               25 April 2007

                  The LDAP entryDN Operational Attribute
                   <draft-zeilenga-ldap-entrydn-02.txt>

Status of this Memo

  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.Zeilenga@Isode.COM>.

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Abstract

  This document describes the LDAP/X.500 'entryDN' operational
  attribute.  The attribute provides a copy of the entry's distinguished
  name for use in attribute value assertions.

1. Background and Intended Use

  In X.500 Directory Services [X.501], such as those accessible using
  the Lightweight Directory Access Protocol (LDAP) [RFC4510], an entry
  is identified by its distinguished name (DN) [RFC4512].  However, as
  an entry's DN is not an attribute of the entry, it is not possible to
  perform attribute value assertions [RFC4511] against it.

  This document describes the 'entryDN' operational attribute which
  holds a copy of the entry's distinguished name.  This attribute may be
  used in search filters.  For instance, searching the subtree
  <dc=example,dc=com> with the filter:

      (entryDN:componentFilterMatch:=or:{
          item:{ component "3", rule rdnMatch, value "ou=A" },
          item:{ component "3", rule rdnMatch, value "ou=B" } })

  would return entries in the subtree <ou=A,dc=example,dc=com> and
  entries in subtree <ou=B,dc=example,dc=com>, but would not return any
  other entries in the subtree <dc=example,dc=com>.

  In the above paragraph, DNs are presented using the string
  representation defined in [RFC4514] and the example search filter is
  presented using the string representation defined in [RFC4515] with
  whitespace (line breaks and indentation) added to improve readability.
  The 'componentFilterMatch' and 'rdnMatch' rules are specified in
  [RFC3687].

  Schema definitions are provided using LDAP description formats
  [RFC4512].  Definitions provided here are formatted (line wrapped) for
  readability.

2. 'entryDN' Operational Attribute

  The 'entryDN' operational attribute provides a copy of the entry's
  current DN.

  The following is a LDAP attribute type description suitable for
  publication in subschema subentries.

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      ( IANA-ASSIGNED-OID NAME 'entryDN'
          DESC 'DN of the entry'
          EQUALITY distinguishedNameMatch
          SYNTAX 1.3.6.1.4.1.1466.115.121.1.12
          SINGLE-VALUE
          NO-USER-MODIFICATION
          USAGE directoryOperation )

  Note that the DN of the entry cannot be modified through this
  attribute.

3. Security Considerations

  As this attribute only provides an additional mechanism to access an
  entry's DN, the introduction of this attribute is not believed to
  introduce new security considerations.

4. IANA Considerations

4.1. Object Identifier Registration

  It is requested that IANA register (upon Standards Action) an LDAP
  Object Identifier [RFC4520] for use in this document.

      Subject: Request for LDAP OID Registration
      Person & email address to contact for further information:
          Kurt Zeilenga <Kurt.Zeilenga@Isode.COM>
      Specification: RFC XXXX
      Author/Change Controller: IESG
      Comments:
          Identifies the 'entryDN' attribute type

  [[Note to RFC Editor:  The string IANA-ASSIGNED-OID, as it appears in
  this document, is to be replaced by Object Identifier assigned by IANA
  for use in document.]]

4.2. 'entryDN' Descriptor Registration

  It is requested that IANA register (upon Standards Action) the LDAP
  'entryDN' descriptor [RFC4520].

      Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): entryDN
      Object Identifier: IANA-ASSIGNED-OID

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      Person & email address to contact for further information:
          Kurt Zeilenga <Kurt.Zeilenga@Isode.COM>
      Usage: Attribute Type
      Specification: RFC XXXX
      Author/Change Controller: IESG

5. Author's Address

  Kurt D. Zeilenga
  Isode Limited

  Email: Kurt.Zeilenga@Isode.COM

6. References

6.1. Normative References

  [RFC4510]     Zeilenga, K. (editor), "LDAP: Technical Specification
                Road Map", RFC 4510, June 2006.

  [RFC4512]     Zeilenga, K. (editor), "LDAP: Directory Information
                Models", RFC 4512, June 2006.

  [X.501]       International Telecommunication Union -
                Telecommunication Standardization Sector, "The Directory
                -- Models," X.501(1993) (also ISO/IEC 9594-2:1994).

6.2. Informative References

  [RFC3687]     Legg, S., "Lightweight Directory Access Protocol (LDAP)
                and X.500 Component Matching Rules", RFC 3687, February
                2004.

  [RFC4511]     Sermersheim, J. (editor), "LDAP: The Protocol", RFC
                4511, June 2006.

  [RFC4514]     Zeilenga, K. (editor), "LDAP: String Representation of
                Distinguished Names", RFC 4514, June 2006.

  [RFC4515]     Smith, M. (editor), "LDAP: String Representation of
                Search Filters", RFC 4515, June 2006.

  [RFC4520]     Zeilenga, K., "Internet Assigned Numbers Authority
                (IANA) Considerations for the Lightweight Directory

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                Access Protocol (LDAP)", RFC 4520, BCP 64, June 2006.

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