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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). 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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]