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<pre>Network Working Group K. Zeilenga
Request for Comments: 5020 Isode Limited
Category: Standards Track August 2007
<span class="h1">The Lightweight Directory Access Protocol (LDAP) entryDN</span>
<span class="h1">Operational Attribute</span>
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.
<span class="grey">Zeilenga Standards Track [Page 1]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-2" ></span>
<span class="grey"><a href="./rfc5020">RFC 5020</a> LDAP entryDN August 2007</span>
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Background and Intended Use</span>
In X.500 Directory Services [<a href="#ref-X.501" title=""The Directory -- Models,"">X.501</a>], such as those accessible using
the Lightweight Directory Access Protocol (LDAP) [<a href="./rfc4510" title=""Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map"">RFC4510</a>], an entry
is identified by its distinguished name (DN) [<a href="./rfc4512" title=""Lightweight Directory Access Protocol (LDAP): Directory Information Models"">RFC4512</a>]. However, as
an entry's DN is not an attribute of the entry, it is not possible to
perform attribute value assertions [<a href="./rfc4511" title=""Lightweight Directory Access Protocol (LDAP): The Protocol"">RFC4511</a>] 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 [<a href="./rfc4514" title=""Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished Names"">RFC4514</a>], and the example search filter is
presented using the string representation defined in [<a href="./rfc4515" title=""Lightweight Directory Access Protocol (LDAP): String Representation of Search Filters"">RFC4515</a>] with
whitespace (line breaks and indentation) added to improve
readability. The 'componentFilterMatch' and 'rdnMatch' rules are
specified in [<a href="./rfc3687" title=""Lightweight Directory Access Protocol (LDAP) and X.500 Component Matching Rules"">RFC3687</a>].
Schema definitions are provided using LDAP description formats
[<a href="./rfc4512" title=""Lightweight Directory Access Protocol (LDAP): Directory Information Models"">RFC4512</a>]. Definitions provided here are formatted (line wrapped)
for readability.
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. 'entryDN' Operational Attribute</span>
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 )
<span class="grey">Zeilenga Standards Track [Page 2]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-3" ></span>
<span class="grey"><a href="./rfc5020">RFC 5020</a> LDAP entryDN August 2007</span>
Note that the DN of the entry cannot be modified through this
attribute.
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. Security Considerations</span>
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.
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. IANA Considerations</span>
<span class="h3"><a class="selflink" id="section-4.1" href="#section-4.1">4.1</a>. Object Identifier Registration</span>
IANA has registered (upon Standards Action) an LDAP Object Identifier
[<a href="./rfc4520" title=""Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)"">RFC4520</a>] 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: <a href="./rfc5020">RFC 5020</a>
Author/Change Controller: IESG
Comments:
Identifies the 'entryDN' attribute type
<span class="h3"><a class="selflink" id="section-4.2" href="#section-4.2">4.2</a>. 'entryDN' Descriptor Registration</span>
IANA has registered (upon Standards Action) the LDAP 'entryDN'
descriptor [<a href="./rfc4520" title=""Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)"">RFC4520</a>].
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: <a href="./rfc5020">RFC 5020</a>
Author/Change Controller: IESG
<span class="grey">Zeilenga Standards Track [Page 3]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-4" ></span>
<span class="grey"><a href="./rfc5020">RFC 5020</a> LDAP entryDN August 2007</span>
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. References</span>
<span class="h3"><a class="selflink" id="section-5.1" href="#section-5.1">5.1</a>. Normative References</span>
[<a id="ref-RFC4510">RFC4510</a>] Zeilenga, K., Ed., "Lightweight Directory Access Protocol
(LDAP): Technical Specification Road Map", <a href="./rfc4510">RFC 4510</a>, June
2006.
[<a id="ref-RFC4512">RFC4512</a>] Zeilenga, K., Ed., "Lightweight Directory Access Protocol
(LDAP): Directory Information Models", <a href="./rfc4512">RFC 4512</a>, June
2006.
[<a id="ref-X.501">X.501</a>] International Telecommunication Union - Telecommunication
Standardization Sector, "The Directory -- Models,"
X.501(1993) (also ISO/IEC 9594-2:1994).
<span class="h3"><a class="selflink" id="section-5.2" href="#section-5.2">5.2</a>. Informative References</span>
[<a id="ref-RFC3687">RFC3687</a>] Legg, S., "Lightweight Directory Access Protocol (LDAP)
and X.500 Component Matching Rules", <a href="./rfc3687">RFC 3687</a>, February
2004.
[<a id="ref-RFC4511">RFC4511</a>] Sermersheim, J., Ed., "Lightweight Directory Access
Protocol (LDAP): The Protocol", <a href="./rfc4511">RFC 4511</a>, June 2006.
[<a id="ref-RFC4514">RFC4514</a>] Zeilenga, K., Ed., "Lightweight Directory Access Protocol
(LDAP): String Representation of Distinguished Names",
<a href="./rfc4514">RFC 4514</a>, June 2006.
[<a id="ref-RFC4515">RFC4515</a>] Smith, M., Ed., and T. Howes, "Lightweight Directory
Access Protocol (LDAP): String Representation of Search
Filters", <a href="./rfc4515">RFC 4515</a>, June 2006.
[<a id="ref-RFC4520">RFC4520</a>] Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
Considerations for the Lightweight Directory Access
Protocol (LDAP)", <a href="https://www.rfc-editor.org/bcp/bcp64">BCP 64</a>, <a href="./rfc4520">RFC 4520</a>, June 2006.
Author's Address
Kurt D. Zeilenga
Isode Limited
EMail: Kurt.Zeilenga@Isode.COM
<span class="grey">Zeilenga Standards Track [Page 4]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-5" ></span>
<span class="grey"><a href="./rfc5020">RFC 5020</a> LDAP entryDN August 2007</span>
Full Copyright Statement
Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions
contained in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a>, and except as set forth therein, the authors
retain all their rights.
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Acknowledgement
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Internet Society.
Zeilenga Standards Track [Page 5]
</pre>
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