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Network Working Group K. Zeilenga Request for Comments: 5020 Isode Limited Category: Standards Track August 2007 The Lightweight Directory Access Protocol (LDAP) entryDN Operational Attribute Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract This document describes the Lightweight Directory Access Protocol (LDAP) / X.500 'entryDN' operational attribute. The attribute provides a copy of the entry's distinguished name for use in attribute value assertions. Zeilenga Standards Track [Page 1] RFC 5020 LDAP entryDN August 2007 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 an LDAP attribute type description suitable for publication in subschema subentries. ( 1.3.6.1.1.20 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 ) Zeilenga Standards Track [Page 2] RFC 5020 LDAP entryDN August 2007 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 IANA has registered (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 5020 Author/Change Controller: IESG Comments: Identifies the 'entryDN' attribute type 4.2. 'entryDN' Descriptor Registration IANA has registered (upon Standards Action) the LDAP 'entryDN' descriptor [RFC4520]. Subject: Request for LDAP Descriptor Registration Descriptor (short name): entryDN Object Identifier: 1.3.6.1.1.20 Person & email address to contact for further information: Kurt Zeilenga <Kurt.Zeilenga@Isode.COM> Usage: Attribute Type Specification: RFC 5020 Author/Change Controller: IESG Zeilenga Standards Track [Page 3] RFC 5020 LDAP entryDN August 2007 5. References 5.1. Normative References [RFC4510] Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map", RFC 4510, June 2006. [RFC4512] Zeilenga, K., Ed., "Lightweight Directory Access Protocol (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). 5.2. Informative References [RFC3687] Legg, S., "Lightweight Directory Access Protocol (LDAP) and X.500 Component Matching Rules", RFC 3687, February 2004. [RFC4511] Sermersheim, J., Ed., "Lightweight Directory Access Protocol (LDAP): The Protocol", RFC 4511, June 2006. [RFC4514] Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished Names", RFC 4514, June 2006. [RFC4515] Smith, M., Ed., and T. Howes, "Lightweight Directory Access Protocol (LDAP): String Representation of Search Filters", RFC 4515, June 2006. [RFC4520] Zeilenga, K., "Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)", BCP 64, RFC 4520, June 2006. Author's Address Kurt D. Zeilenga Isode Limited EMail: Kurt.Zeilenga@Isode.COM Zeilenga Standards Track [Page 4] RFC 5020 LDAP entryDN August 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM 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. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Zeilenga Standards Track [Page 5] Back

Edit File : rfc5020.txt | Size : 8.41 KB

Network Working Group                                        K. Zeilenga
Request for Comments: 5020                                 Isode Limited
Category: Standards Track                                    August 2007

The Lightweight Directory Access Protocol (LDAP) entryDN
                         Operational Attribute

Status of This Memo

This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

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

Zeilenga                    Standards Track                     [Page 1]

RFC 5020                      LDAP entryDN                   August 2007

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 an LDAP attribute type description suitable for
   publication in subschema subentries.

( 1.3.6.1.1.20 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 )

Zeilenga                    Standards Track                     [Page 2]

RFC 5020                      LDAP entryDN                   August 2007

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

IANA has registered (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 5020
      Author/Change Controller: IESG
      Comments:
          Identifies the 'entryDN' attribute type

4.2.  'entryDN' Descriptor Registration

IANA has registered (upon Standards Action) the LDAP 'entryDN'
   descriptor [RFC4520].

Subject: Request for LDAP Descriptor Registration
      Descriptor (short name): entryDN
      Object Identifier: 1.3.6.1.1.20
      Person & email address to contact for further information:
          Kurt Zeilenga <Kurt.Zeilenga@Isode.COM>
      Usage: Attribute Type
      Specification: RFC 5020
      Author/Change Controller: IESG

Zeilenga                    Standards Track                     [Page 3]

RFC 5020                      LDAP entryDN                   August 2007

5.  References

5.1.  Normative References

[RFC4510]   Zeilenga, K., Ed., "Lightweight Directory Access Protocol
               (LDAP): Technical Specification Road Map", RFC 4510, June
               2006.

[RFC4512]   Zeilenga, K., Ed., "Lightweight Directory Access Protocol
               (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).

5.2.  Informative References

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

[RFC4511]   Sermersheim, J., Ed., "Lightweight Directory Access
               Protocol (LDAP): The Protocol", RFC 4511, June 2006.

[RFC4514]   Zeilenga, K., Ed., "Lightweight Directory Access Protocol
               (LDAP): String Representation of Distinguished Names",
               RFC 4514, June 2006.

[RFC4515]   Smith, M., Ed., and T. Howes, "Lightweight Directory
               Access Protocol (LDAP): String Representation of Search
               Filters", RFC 4515, June 2006.

[RFC4520]   Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
               Considerations for the Lightweight Directory Access
               Protocol (LDAP)", BCP 64, RFC 4520, June 2006.

Author's Address

Kurt D. Zeilenga
   Isode Limited

EMail: Kurt.Zeilenga@Isode.COM

Zeilenga                    Standards Track                     [Page 4]

RFC 5020                      LDAP entryDN                   August 2007

Full Copyright Statement

This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
   THE INTERNET ENGINEERING TASK FORCE DISCLAIM 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.

Intellectual Property

The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.

Acknowledgement

Funding for the RFC Editor function is currently provided by the
   Internet Society.

Zeilenga                    Standards Track                     [Page 5]

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