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openldap/doc/drafts/draft-zeilenga-ldap-cancel-xx.txt
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INTERNET-DRAFT Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
Expires in six months 25 October 2003
LDAP Cancel Operation
<draft-zeilenga-ldap-cancel-10.txt>
1. Status of this Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.
This document is intended to be, after appropriate review and
revision, submitted to the RFC Editor as a Standard Track document.
Distribution of this memo is unlimited. Technical discussion of this
document will take place on the IETF LDAP Extensions mailing list
<ldapext@ietf.org>. Please send editorial comments directly to the
author <Kurt@OpenLDAP.org>.
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>.
Copyright (C) The Internet Society (2003). All Rights Reserved.
Please see the Full Copyright section near the end of this document
for more information.
Abstract
This specification describes a Lightweight Directory Access Protocol
(LDAP) extended operation to cancel (or abandon) an outstanding
operation. Unlike the LDAP Abandon operation but like the X.511
Directory Access Protocol (DAP) Abandon operation, this operation has
a response which provides an indication of its outcome.
Zeilenga LDAP Cancel [Page 1]
INTERNET-DRAFT draft-zeilenga-ldap-cancel-10 25 Octeboer 2003
Terminology
Protocol elements are described using ASN.1 [X.680] with implicit
tags. The term "BER-encoded" means the element is to be encoded using
the Basic Encoding Rules [X.690] under the restrictions detailed in
Section 5.1 of [RFC2251].
DSA stands for Directory System Agent (or server).
DSE stands for DSA-specific Entry.
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 BCP 14 [RFC2119].
1. Background and Intent of Use
The Lightweight Directory Access Protocol (LDAP) [RFC3377] provides an
Abandon operation [RFC2251] which clients may use to cancel other
operations. The Abandon operation does not have a response and calls
for there to be no response of the abandoned operation. These
semantics provide the client with no clear indication of the outcome
of the Abandon operation.
X.511 Directory Access Protocol (DAP) [X.511] provides an Abandon
operation which does have a response and also requires the abandoned
operation to return a response indicating it was canceled. The LDAP
Cancel operation is modeled after the DAP Abandon operation.
The LDAP Cancel operation SHOULD be used instead of the LDAP Abandon
operation when the client needs an indication of the outcome. This
operation may be used to cancel both interrogation and update
operations.
2. Cancel Operation
The Cancel operation is defined as a LDAP Extended Operation [RFC2251,
Section 4.12] identified by the IANA-ASSIGNED-OID. This section
details the syntax of the Cancel request and response messages and
defines additional LDAP resultCodes.
cancelRequestValue ::= SEQUENCE {
cancelID MessageID
}
2.1. Cancel Request
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The Cancel request is an ExtendedRequest with the requestName field
containing the IANA-ASSIGNED-OID and a requestValue field which
contains a BER-encoded cancelRequestValue value. The cancelID field
contains the message id associated with the operation to be canceled.
2.2. Cancel Response
A Cancel response is an ExtendedResponse where the responseName and
response fields are absent.
2.3. Additional Result Codes
Implementations of this specification SHALL recognize the following
additional resultCode values:
canceled (IANA-ASSIGNED-1)
noSuchOperation (IANA-ASSIGNED-2)
tooLate (IANA-ASSIGNED-3)
cannotCancel (IANA-ASSIGNED-4)
3. Operational Semantics
The function of the Cancel Operation is to request that the server
cancel an outstanding operation issued within the same session.
The client requests the cancelation of an outstanding operation by
issuing a Cancel Response with a cancelID set to the message id of the
outstanding operation. The Cancel Request itself has a distinct
message id. Clients SHOULD NOT request cancelation of an operation
multiple times.
If the server is willing and able to cancel the outstanding operation
identified by the cancelId, the server SHALL return a Cancel Response
with a success resultCode and the canceled operation SHALL fail with
canceled resultCode. Otherwise the Cancel Response SHALL have a
non-success resultCode and SHALL NOT have impact upon the outstanding
operation (if it exists).
The protocolError resultCode is returned if the server is unable to
parse the requestValue or the requestValue is absent,
The noSuchOperation resultCode is returned if the server has no
knowledge of the operation requested to be canceled.
The cannotCancel resultCode is returned if the identified operation
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does not support cancelation or the cancel operation could not be
performed. The following classes of operations are not cancelable:
- operations which have no response,
- operations which create, alter, or destroy authentication and/or
authorization associations,
- operations which establish, alter, or tear-down security services,
and
- operations which abandon or cancel other operations.
Specifically, the Abandon, Bind, Start TLS [RFC2830], Unbind and
Cancel operations are not cancelable.
The tooLate resultCode is returned to indicate that it is too late to
cancel the outstanding operation. For example, the server may return
tooLate for a request to cancel an outstanding modify operation which
as already committed updates to the underlying data store.
Servers SHOULD indicate their support for this extended operation by
providing IANA-ASSIGNED-OID as a value of the 'supportedExtension'
attribute type in their root DSE. A server MAY choose to advertise
this extension only when the client is authorized to use it.
4. Security Considerations
This operation is intended to allow user to cancel operations they
previously issued during the current LDAP association. In certain
cases, such as when the Proxy Authorization Control is in use,
different outstanding operations may be processed under different LDAP
associations. Servers MUST NOT allow a user to cancel an operation
belonging to another user.
Some operations should not be cancelable for security reasons. This
specification disallows cancelation of Bind operation and Start TLS
extended operation so as to avoid adding complexity to authentication,
authorization, and security layer semantics. Designers of future
extended operations and/or controls should disallow abandonment and
cancelation when appropriate.
5. IANA Considerations
Registration of the following values [RFC3383] is requested.
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5.1. Object Identifier
It is requested that IANA register upon Standards Action an LDAP
Object Identifier to identify the LDAP Cancel Operation as defined in
this document.
Subject: Request for LDAP Object Identifier Registration
Person & email address to contact for further information:
Kurt Zeilenga <kurt@OpenLDAP.org>
Specification: RFC XXXX
Author/Change Controller: IESG
Comments:
Identifies the LDAP Cancel Operation
5.2. LDAP Protocol Mechanism
It is requested that IANA register upon Standards Action the LDAP
Protocol Mechanism described in this document.
Subject: Request for LDAP Protocol Mechanism Registration
Object Identifier: IANA-ASSIGNED-OID
Description: LDAP Cancel Operation
Person & email address to contact for further information:
Kurt Zeilenga <kurt@openldap.org>
Usage: Extended Operation
Specification: RFC XXXX
Author/Change Controller: IESG
Comments: none
in 2
5.3. LDAP Result Codes
It is requested that IANA register upon Standards Action the LDAP
Result Codes described in this document.
Subject: LDAP Result Code Registration
Person & email address to contact for further information:
Kurt Zeilenga <kurt@OpenLDAP.org>
Result Code Name: canceled
Result Code Name: noSuchOperation
Result Code Name: tooLate
Result Code Name: cannotCancel
Specification: RFC XXXX
Author/Change Controller: IESG
Comments: request four consecutive result codes be assigned
Zeilenga LDAP Cancel [Page 5]
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6. Acknowledgment
The LDAP Cancel operation is modeled after the X.511 DAP Abandon
operation.
7. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14 (also RFC 2119), March 1997.
[RFC2251] Wahl, M., T. Howes and S. Kille, "Lightweight Directory
Access Protocol (v3)", RFC 2251, December 1997.
[RFC2830] Hodges, J., R. Morgan, and M. Wahl, "Lightweight
Directory Access Protocol (v3): Extension for Transport
Layer Security", RFC 2830, May 2000.
[RFC3377] Hodges, J. and R. Morgan, "Lightweight Directory Access
Protocol (v3): Technical Specification", RFC 3377,
September 2002.
[X.680] International Telecommunication Union -
Telecommunication Standardization Sector, "Abstract
Syntax Notation One (ASN.1) - Specification of Basic
Notation", X.680(1997) (also ISO/IEC 8824-1:1998).
[X.690] International Telecommunication Union -
Telecommunication Standardization Sector, "Specification
of ASN.1 encoding rules: Basic Encoding Rules (BER),
Canonical Encoding Rules (CER), and Distinguished
Encoding Rules (DER)", X.690(1997) (also ISO/IEC
8825-1:1998).
8. Informative References
[RFC3383] Zeilenga, K., "IANA Considerations for LDAP", BCP 64
(also RFC 3383), September 2002.
[X.511] International Telecommunication Union -
Telecommunication Standardization Sector, "The
Directory: Abstract Service Definition", X.511(1993).
9. Author's Address
Kurt D. Zeilenga
Zeilenga LDAP Cancel [Page 6]
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OpenLDAP Foundation
<Kurt@OpenLDAP.org>
Intellectual Property Rights
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to the implementation or use of the technology described in this
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Full Copyright
Copyright (C) The Internet Society (2003). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implmentation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be followed,
or as required to translate it into languages other than English.
Zeilenga LDAP Cancel [Page 7]
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