Lightweight Directory Access Protocol (LDAP): Auxiliary Object Class 'mailboxRelatedObject'

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Author Michael Ströder 
Last updated 2014-09-26
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Independent Submission                                       M. Stroeder
Internet-Draft                                    Independent consultant
Intended status: Informational                        September 26, 2014
Expires: March 30, 2015

             Lightweight Directory Access Protocol (LDAP):
             Auxiliary Object Class 'mailboxRelatedObject'


   This document defines the auxiliary object class
   'mailboxRelatedObject' that can be used to associate an arbitrary
   object with an Internet mail address.  Furthermore an attribute
   'intlMailAdr' is defined for storing fully internationalized Internet
   mail addresses.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Attribute Type Definition . . . . . . . . . . . . . . . . . .   3
   3.  Object Class Definition . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The attribute 'mail' [RFC4524] can be used to store Internet mail
   addresses with internationalized <domain> by using the ToASCII method
   [RFC3490].  But it cannot be used to store addresses with <local-
   part> containing non-ASCII characters.

   Therefore this documents defines a new attribute type 'intlMailAdr'
   for fully internationalized Internet mail addresses as defined in

   Often there is a need to associate a, most times non-personal,
   Internet mail address with an arbitrary object (a service or system
   user) so applications can lookup where to send mail for this object.
   Many times the commonly available object class 'inetOrgPerson'
   [RFC2798] is wrongly used for storing such non-personal Internet mail
   addresses in attribute 'mail' [RFC4524].

   Therefore this document defines the auxiliary object class
   'mailboxRelatedObject' that can be used to associate an arbitrary
   object with an Internet mail address.  It allows to add an Internet
   mail address attribute to any entry and allows to use either one or
   both of attributes 'mail' and 'intlMailAdr'.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

   This document is being discussed on the mailing

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2.  Attribute Type Definition

   The attribute type 'intlMailAdr' is defined for storing SMTPUTF8
   compliant addresses [RFC6530].

         NAME 'intlMailAdr'
         DESC 'Internationalized Email Address'
         EQUALITY caseIgnoreMatch
         SUBSTR caseIgnoreSubstringsMatch
         SYNTAX )

   The DirectoryString ( syntax and the
   'caseIgnoreMatch' and 'caseIgnoreSubstringsMatch' rules are described
   in [RFC4517].

   Note that an application might have used the ToASCII method [RFC3490]
   to produce <sub-domain> components of the <Mailbox> production.  This
   leads to different possible string representations of the same
   internationalized Internet mail address which could be listed as
   different values entry's 'intlMailAdr' attribute, operational issues
   may arise.

   The following issues like described for attribute type 'mail' in
   [RFC4524] have to be considered also for 'intlMailAdr' defined above:

   Note that the directory will not ensure that values of this attribute
   conform to the <Mailbox> production [RFC5321].  It is the
   application's responsibility to ensure that domains it stores in this
   attribute are appropriately represented.

   Additionally, the directory will compare values per the matching
   rules named in the above attribute type description.  As these rules
   differ from rules that normally apply to <Mailbox> comparisons,
   operational issues may arise.  For example, the assertion
   ( will match "" even though the
   <local-parts> differ.  Also, where a user has two <Mailbox>es whose
   addresses differ only by case of the <local-part>, both cannot be
   listed as values of the entry's 'intlMailAdr' attribute in the same
   entry (as they are considered equal by the 'caseIgnoreMatch' rule).

3.  Object Class Definition

   Entries of auxiliary object class 'mailboxRelatedObject' MAY contain
   the following optional attributes: 'mail' [RFC4524] 'displayName'
   [RFC2798] 'intlMailAdr'

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         NAME 'mailboxRelatedObject'
         DESC 'Associated RFC 5321 mailbox for any entry'
         MAY ( displayName $ mail $ intlMailAdr ) )

   'mail' and 'intlMailAdr' are listed as optional attributes to allow
   to use only one of both.

   If 'mail' and 'intlMailAdr' are both set an application MAY choose
   one or the other to send mail to the entity represented by the
   directory entry.  Therefore Internet mail addresses in attributes
   'mail' and 'intlMailAdr' SHOULD represent the same mailbox if both
   are set or at least the entity MUST be able to retrieve the mail sent
   to either one of the addresses.

4.  IANA Considerations

   The OID arc used for the attribute type and object class definition
   iso(1) org(3) dod(6) internet(1) private(4) enter-prise(1) public(1) ldap(389)

5.  Security Considerations

   The introduction of these object classes does not impact the security
   of the Internet or a particular LDAP directory service.

   Security considerations for LDAP in general are discussed in
   documents comprising the technical specification [RFC4510].

6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2798]  Smith, M., "Definition of the inetOrgPerson LDAP Object
              Class", RFC 2798, April 2000.

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

   [RFC4517]  Legg, S., "Lightweight Directory Access Protocol (LDAP):
              Syntaxes and Matching Rules", RFC 4517, June 2006.

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   [RFC4524]  Zeilenga, K., "COSINE LDAP/X.500 Schema", RFC 4524, June

6.2.  Informative References

   [RFC3490]  Faltstrom, P., Hoffman, P., and A. Costello,
              "Internationalizing Domain Names in Applications (IDNA)",
              RFC 3490, March 2003.

   [RFC5321]  Klensin, J., "Simple Mail Transfer Protocol", RFC 5321,
              October 2008.

   [RFC6530]  Klensin, J. and Y. Ko, "Overview and Framework for
              Internationalized Email", RFC 6530, February 2012.

Author's Address

   Michael Stroeder
   Independent consultant
   Klauprechtstr. 11
   Karlsruhe  76137


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