Merge remote-tracking branch 'origin/mdb.RE/0.9'

[openldap] / doc / drafts / draft-masarati-ldap-whatfailed-xx.txt

Network Working Group                                        P. Masarati
Internet-Draft                                     Politecnico di Milano
Intended status: Standards Track                       November 19, 2008
Expires: May 23, 2009


                      LDAP "What Failed?" Control
                 draft-masarati-ldap-whatfailed-00.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on May 23, 2009.


















Masarati                  Expires May 23, 2009                  [Page 1]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


Abstract

   This document describes the LDAP "What Failed?" control.  This
   control allows DUAs to request, in response to a failed operation
   request, the object identifier of those extensions that caused the
   operation to fail.


Table of Contents

   1.  Background and Intended Use  . . . . . . . . . . . . . . . . .  3
   2.  LDAP "What Failed?" Control  . . . . . . . . . . . . . . . . .  4
     2.1.  Control Semantics  . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Control Request  . . . . . . . . . . . . . . . . . . . . .  4
     2.3.  Control Response . . . . . . . . . . . . . . . . . . . . .  5
   3.  Implementation Notes . . . . . . . . . . . . . . . . . . . . .  6
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  Object Identifier Registration . . . . . . . . . . . . . .  8
   6.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11
   Intellectual Property and Copyright Statements . . . . . . . . . . 12


























Masarati                  Expires May 23, 2009                  [Page 2]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


1.  Background and Intended Use

   The LDAP Protocol [RFC4510] is extensible.  Extensions include
   controls, extended requests and extensions related to other aspects
   of the protocol, for example those described in [RFC4526], [RFC4529]
   and more.

   Operations may fail for different reasons.  The resultCode may help
   in determining the reason of a failure.  The (optional)
   diagnosticsMessage fields of a LDAPResponse could also be of help.
   However, according to [RFC4511], implementations MUST NOT rely on the
   returned values, which are simply intended to be presented as are to
   human users.

   In case of failure related to the inability to process a control
   marked as critical in a request, the specific resultCode
   unavailableCriticalExtension is returned.  In case of failure related
   to an unrecognized extendedReq, the generic resultCode protocolError
   is returned.  Failures related to handling other extensions may
   result in other generic resultCode values.

   As a consequence, DUAs may be unable to exactly determine what
   extension, if any, caused a failure.  The "What Failed?" control
   represents a means for the DSA to inform DUAs about what specific
   extensions, if any, caused an error notified by the DSA.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].






















Masarati                  Expires May 23, 2009                  [Page 3]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


2.  LDAP "What Failed?" Control

2.1.  Control Semantics

   The presence of the "What Failed?"  LDAP control in a LDAP request
   indicates that the DUA, in case of error, wishes to receive detailed
   information about what extension, if any, caused the error.

   The criticality of the control in the request SHOULD be FALSE.
   According to the semantics of the criticality field as indicated in
   [RFC4511], this ensures that in case the control is not recognized by
   the DSA, it does not cause itself an error.

   The presence of this control in a request does not guarantee that the
   DSA will return detailed information about what extensions caused an
   error.  Considering the requirement on the criticality of the
   control, the DSA MAY simply choose to ignore the control.  The DSA
   MAY hide information about failure in handling an extension to
   prevent disclosure of other information.  The DSA MAY choose to
   notify an error as soon as it is detected, instead of proceed
   checking its ability to handle any other extension present in a
   request.

   Implementations may choose to check the validity of extensions,
   including controls, as soon as they are parsed.  As a consequence, a
   critical control might result in an error before thw "What Failed?"
   control request is parsed.  Implementations SHOULD check anyway the
   presence of this control, unless they detect that the remaining part
   of the request is malformed.  Clients SHOULD NOT rely on any specific
   ordering of controls handling when requesting the "What Failed?"
   control.

   Servers implementing this technical specification SHOULD publish the
   object identifier whatFailed-oid (IANA assigned; see Section 5) as a
   value of the 'supportedControl' attribute [RFC4512] in their root
   DSE.

2.2.  Control Request

   The controlType is whatFailed-oid (IANA assigned; see Section 5); the
   controlValue MUST be absent; the criticality SHOULD be FALSE.










Masarati                  Expires May 23, 2009                  [Page 4]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


2.3.  Control Response

   The controlType is whatFailed-oid (IANA assigned; see Section 5); the
   controlValue is:

       controlValue ::= SET OF oid LDAPOID

   If the set of extension OID is empty, the control is omitted from the
   response.  The criticality MUST be FALSE.










































Masarati                  Expires May 23, 2009                  [Page 5]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


3.  Implementation Notes

   The "What Failed?"  LDAP Control is implemented in OpenLDAP software
   using the temporary OID 1.3.6.1.4.1.4203.666.5.17 under OpenLDAP's
   experimental OID arc.














































Masarati                  Expires May 23, 2009                  [Page 6]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


4.  Security Considerations

   Implementations MUST take measures to prevent the disclosure of
   sensible information whenever this may result from disclosing what
   extension caused an error.  This can consist in excluding the OID of
   specific extensions from the controlValue in the response, or in
   entirely omitting the control in the response.












































Masarati                  Expires May 23, 2009                  [Page 7]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


5.  IANA Considerations

5.1.  Object Identifier Registration

   It is requested that IANA register upon Standards Action an LDAP
   Object Identifier for use in this technical specification.

         Subject: Request for LDAP OID Registration
         Person & email address to contact for further information:
             Pierangelo Masarati <ando@OpenLDAP.org>
         Specification: (I-D)
         Author/Change Controller: IESG
         Comments:
             Identifies the LDAP "What Failed?" Control request
             and response




































Masarati                  Expires May 23, 2009                  [Page 8]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


6.  Acknowledgments


















































Masarati                  Expires May 23, 2009                  [Page 9]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


7.  References

7.1.  Normative References

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

   [RFC4510]  Zeilenga, K., "Lightweight Directory Access Protocol
              (LDAP): Technical Specification Road Map", RFC 4510,
              June 2006.

   [RFC4511]  Sermersheim, J., "Lightweight Directory Access Protocol
              (LDAP): The Protocol", RFC 4511, June 2006.

   [RFC4512]  Zeilenga, K., "Lightweight Directory Access Protocol
              (LDAP): Directory Information Models", RFC 4512,
              June 2006.

7.2.  Informative References

   [RFC4526]  Zeilenga, K., "Lightweight Directory Access Protocol
              (LDAP) Absolute True and False Filters", RFC 4526,
              June 2006.

   [RFC4529]  Zeilenga, K., "Requesting Attributes by Object Class in
              the Lightweight Directory Access Protocol", RFC 4529,
              June 2006.
























Masarati                  Expires May 23, 2009                 [Page 10]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


Author's Address

   Pierangelo Masarati
   Politecnico di Milano
   Dipartimento di Ingegneria Aerospaziale
   via La Masa 34
   Milano  20156
   IT

   Phone: +39 02 2399 8309
   Fax:   +39 02 2399 8334
   Email: ando@OpenLDAP.org
   URI:   http://www.aero.polimi.it/masarati/






































Masarati                  Expires May 23, 2009                 [Page 11]
\f
Internet-Draft               LDAP WHATFAILED               November 2008


Full Copyright Statement

   Copyright (C) The IETF Trust (2008).

   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 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.











Masarati                  Expires May 23, 2009                 [Page 12]
\f