Network Working Group                                        K. Zeilenga
Request for Comments: 3352                           OpenLDAP Foundation
Obsoletes: 1798                                               March 2003
Category: Informational

     Connection-less Lightweight Directory Access Protocol (CLDAP)
                           to Historic Status

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   The Connection-less Lightweight Directory Access Protocol (CLDAP)
   technical specification, RFC 1798, was published in 1995 as a
   Proposed Standard.  This document discusses the reasons why the CLDAP
   technical specification has not been furthered on the Standard Track.
   This document recommends that RFC 1798 be moved to Historic status.

1. Background

   Connection-less Lightweight Directory Access Protocol (CLDAP)
   [RFC 1798] was published in 1995 as a Proposed Standard.  The protocol
   was targeted at applications which require lookup of small amounts of
   information held in the directory.  The protocol avoids the overhead
   of establishing (and closing) a connection and the session bind and
   unbind operations needed in connection-oriented directory access
   protocols.  The CLDAP was designed to complement version 2 of the
   Lightweight Directory Access Protocol (LDAPv2) [RFC 1777], now
   Historic [HISTORIC].

   In the seven years since its publication, CLDAP has not become widely
   deployed on the Internet.  There are a number of probable reasons for
   this:

   - Limited functionality:
        + anonymous only,
        + read only,
        + small result sizes only, and

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RFC 3352                CLDAP to Historic Status              March 2003

   - Insufficient security capabilities:
        + no integrity protection,
        + no confidentiality protection
   - Inadequate internationalization support;
   - Insufficient extensibility; and
   - Lack of multiple independently developed implementations.

   The CLDAP technical specification has normative references to
   multiple obsolete technical specifications including X.501(88),
   X.511(88), RFC 1487 (the predecessor to RFC 1777, the now Historic
   LDAPv2 technical specification).  Unless the technical specification
   were to be updated, CLDAP cannot remain on the standards track
   because of the Normative reference to a Historic RFC.

   The community recognized in the mid-1990s that CLDAP needed to be
   updated.  In response to this, the IETF chartered the LDAP Extensions
   Working Group (LDAPext WG) in 1997 to undertake this update.  The
   LDAPext WG is concluding without producing an update to CLDAP.
   Currently, there is no standardization effort to update CLDAP.

   It should be noted that the community still has interest in
   developing a "connection-less" directory access protocol.  However,
   based on operational experience, has determined that further
   experimentation is necessary to address outstanding technical issues.
   In particular, security considerations associated with
   "connection-less" services need to be addressed.

2. Recommendation

   As there is no viable standardization effort to update CLDAP as
   necessary to keep it on the standards track and the community
   currently considers this an area requiring further experimentation,
   RFC 1798 must be moved to Historic status.

   It is recommended that those interested in connection-less access to
   X.500-based directory services experiment with [LDAPUDP] and other
   alternatives which might become available.

3. Security Considerations

   The security of the Internet will not be impacted by the retirement
   of CLDAP.

4. Acknowledgment

   The author would like to thank the designers of CLDAP for their
   contribution to the Internet community.

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RFC 3352                CLDAP to Historic Status              March 2003

5. Normative References

   [HISTORIC] Zeilenga, K., "Lightweight Directory Access Protocol
              version 2 (LDAPv2) to Historic Status", RFC 3494, February
              2003.

   [CLDAP]    Young, A. "Connection-less Lightweight Directory Access
              Protocol," RFC 1798, June 1995.

6. Informative References

   [LDAPUDP]  Johansson, L. and R. Hedberg, "Lightweight Directory
              Access Protocol over UDP/IP," Work in Progress.

   [RFC 1777]  Yeong, W., Howes, T. and S. Kille, "Lightweight Directory
              Access Protocol", RFC 1777, March 1995.

   [RFC 3377]  Hodges, J. and R. Morgan, "Lightweight Directory Access
              Protocol (v3): Technical Specification", RFC 3377,
              September 2002.

   [X501]     The Directory: Models.  CCITT Recommendation X.501 ISO/IEC
              JTC 1/SC21; International Standard 9594-2, 1988.

   [X511]     The Directory: Abstract Service Definition.  CCITT
              Recommendation X.511, ISO/IEC JTC 1/SC21; International
              Standard 9594-3, 1988.

7. Author's Address

   Kurt D. Zeilenga
   OpenLDAP Foundation

   EMail: Kurt@OpenLDAP.org

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RFC 3352                CLDAP to Historic Status              March 2003

8.  Full Copyright Statement

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

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   The limited permissions granted above are perpetual and will not be
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Acknowledgement

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

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