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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

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

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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

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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].

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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.

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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.

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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.

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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.

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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

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6.  Acknowledgments

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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.

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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/

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