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Network Working Group Request for Comments: 5020 Category: Standards Track

K. Zeilenga Isode Limited 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.

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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) [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 holds a copy of the entry's be used in search filters. with the 'entryDN' operational attribute which distinguished name. This attribute may For instance, searching the subtree 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 and entries in subtree , but would not return any other entries in the subtree . In the above paragraph, DNs are presented representation defined in [RFC4514], and presented using the string representation whitespace (line breaks and indentation) readability. The 'componentFilterMatch' specified in [RFC3687]. using the string the example search filter is defined in [RFC4515] with added to improve and 'rdnMatch' rules are

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 )

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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. 4.1. IANA Considerations 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 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 Usage: Attribute Type Specification: RFC 5020 Author/Change Controller: IESG

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5. 5.1.

References Normative References Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map", RFC 4510, June 2006. Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): Directory Information Models", RFC 4512, June 2006. International Telecommunication Union - Telecommunication Standardization Sector, "The Directory -- Models," X.501(1993) (also ISO/IEC 9594-2:1994).

[RFC4510]

[RFC4512]

[X.501]

5.2.

Informative References Legg, S., "Lightweight Directory Access Protocol (LDAP) and X.500 Component Matching Rules", RFC 3687, February 2004. Sermersheim, J., Ed., "Lightweight Directory Access Protocol (LDAP): The Protocol", RFC 4511, June 2006. Zeilenga, K., Ed., "Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished Names", RFC 4514, June 2006. Smith, M., Ed., and T. Howes, "Lightweight Directory Access Protocol (LDAP): String Representation of Search Filters", RFC 4515, June 2006. Zeilenga, K., "Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)", BCP 64, RFC 4520, June 2006.

[RFC3687]

[RFC4511]

[RFC4514]

[RFC4515]

[RFC4520]

Author's Address Kurt D. Zeilenga Isode Limited EMail: Kurt.Zeilenga@Isode.COM

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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 copyrights, patents or patent applications, or other rights that may cover technology that may be required this standard. Please address the information to the ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. attention any proprietary to implement IETF at

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