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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
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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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