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Network Working Group                                        K. Zeilenga
Request for Comments: 4525                           OpenLDAP Foundation
Category: Informational                                        June 2006

Lightweight Directory Access Protocol (LDAP)
                       Modify-Increment Extension

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.

Abstract

This document describes an extension to the Lightweight Directory
   Access Protocol (LDAP) Modify operation to support an increment
   capability.  This extension is useful in provisioning applications,
   especially when combined with the assertion control and/or the pre-
   read or post-read control extension.

Table of Contents

1. Background and Intended Use .....................................1
   2. The Modify-Increment Extension ..................................2
   3. LDIF Support ....................................................2
   4. Security Considerations .........................................3
   5. IANA Considerations .............................................3
      5.1. Object Identifier ..........................................3
      5.2. LDAP Protocol Mechanism ....................................3
      5.3. LDAP Protocol Mechanism ....................................4
   6. References ......................................................4
      6.1. Normative References .......................................4
      6.2. Informative References .....................................5

1.  Background and Intended Use

The Lightweight Directory Access Protocol (LDAP) [RFC4510] does not
   currently provide an operation to increment values of an attribute.
   A client must read the values of the attribute and then modify those
   values to increment them by the desired amount.  As the values may be
   updated by other clients between this add and modify, the client must

Zeilenga                     Informational                      [Page 1]

RFC 4525            LDAP Modify-Increment Extension            June 2006

be careful to construct the modify request so that it fails in this
   case, and upon failure, to re-read the values and construct a new
   modify request.

This document extends the LDAP Modify Operation [RFC4511] to support
   an increment values capability.  This feature is intended to be used
   with either the LDAP pre-read or post-read control extensions
   [RFC4527].  This feature may also be used with the LDAP assertion
   control extension [RFC4528] to provide test-and-increment
   functionality.

In this document key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
   "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
   "OPTIONAL" are to be interpreted as described in BCP 14 [RFC2119].

2.  The Modify-Increment Extension

This document extends the LDAP Modify request to support a increment
   values capability.  Implementations of this extension SHALL support
   an additional ModifyRequest operation enumeration value increment
   (3), as described herein.  Implementations not supporting this
   extension will treat this value as they would an unlisted value,
   e.g., as a protocol error.

The increment (3) operation value specifies that an increment values
   modification is requested.  All existing values of the modification
   attribute are to be incremented by the listed value.  The
   modification attribute must be appropriate for the request (e.g., it
   must have INTEGER or other increment-able values), and the
   modification must provide one and only one value.  If the attribute
   is not appropriate for the request, a constraintViolation or other
   appropriate error is to be returned.  If multiple values are
   provided, a protocolError is to be returned.

Servers supporting this feature SHOULD publish the object identifier
   (OID) 1.3.6.1.1.14  as a value of the 'supportedFeatures' [RFC4512]
   attribute in the root DSE.  Clients supporting this feature SHOULD
   NOT use the feature unless they know the server supports it.

3. LDIF Support

To represent Modify-Increment requests in LDAP Data Interchange
   Format [RFC2849], the ABNF [RFC4234] production <mod-spec> is
   extended as follows:

mod-spec =/ "increment:" FILL AttributeDescription SEP
            attrval-spec "-" SEP

Zeilenga                     Informational                      [Page 2]

RFC 4525            LDAP Modify-Increment Extension            June 2006

For example,

# Increment uidNumber
       dn: cn=max-assigned uidNumber,dc=example,dc=com
       changetype: modify
       increment: uidNumber
       uidNumber: 1
       -

This LDIF fragment represents a Modify request to increment the
   value(s) of uidNumber by 1.

4.  Security Considerations

General LDAP security considerations [RFC4510], as well as those
   specific to the LDAP Modify [RFC4511], apply to this Modify-Increment
   extension.  Beyond these considerations, it is noted that
   introduction of this extension should reduce application complexity
   (by providing one operation for what presently requires multiple
   operations) and, hence, it may aid in the production of correct and
   secure implementations.

5.  IANA Considerations

Registration of the following values [RFC4520] have been completed.

5.1.  Object Identifier

The IANA has assigned an LDAP Object Identifier to identify the LDAP
   Modify-Increment feature, 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 4525
       Author/Change Controller: Author
       Comments:
           Identifies the LDAP Modify-Increment feature

5.2.  LDAP Protocol Mechanism

The following LDAP Protocol Mechanism has been registered.

Subject: Request for LDAP Protocol Mechanism Registration
       Object Identifier: 1.3.6.1.1.14
       Description: Modify-Increment
       Person & email address to contact for further information:
           Kurt Zeilenga <kurt@openldap.org>

Zeilenga                     Informational                      [Page 3]

RFC 4525            LDAP Modify-Increment Extension            June 2006

Usage: Feature
       Specification: RFC 4525
       Author/Change Controller: Kurt Zeilenga <kurt@openldap.org>
       Comments: none

5.3.  LDAP Protocol Mechanism

The IANA has assigned an LDAP ModifyRequest Operation Type (3)
   [RFC4520] for use in this document.

Subject: Request for LDAP Protocol Mechanism Registration
       ModifyRequest Operation Name: increment
       Description: Modify-Increment
       Person & email address to contact for further information:
           Kurt Zeilenga <kurt@openldap.org>
       Usage: Feature
       Specification: RFC 4525
       Author/Change Controller: Kurt Zeilenga <kurt@openldap.org>
       Comments: none

6.  References

6.1.  Normative References

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

[RFC4234]     Crocker, D. and P. Overell, "Augmented BNF for Syntax
                 Specifications: ABNF", RFC 4234, October 2005.

[RFC2849]     Good, G., "The LDAP Data Interchange Format (LDIF) -
                 Technical Specification", RFC 2849, June 2000.

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

[RFC4511]     Sermersheim, J., Ed., "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.

Zeilenga                     Informational                      [Page 4]

RFC 4525            LDAP Modify-Increment Extension            June 2006

6.2.  Informative References

[RFC4520]     Zeilenga, K., "Internet Assigned Numbers Authority
                 (IANA) Considerations for the Lightweight Directory
                 Access Protocol (LDAP)", BCP 64, RFC 4520, June 2006.

[RFC4527]     Zeilenga, K., "Lightweight Directory Access Protocol
                 (LDAP) Read Entry Controls", RFC 4527, June 2006.

[RFC4528]     Zeilenga, K., "Lightweight Directory Access Protocol
                 (LDAP) Assertion Control", RFC 4528, June 2006.

Author's Address

Kurt D. Zeilenga
   OpenLDAP Foundation

EMail: Kurt@OpenLDAP.org

Zeilenga                     Informational                      [Page 5]

RFC 4525            LDAP Modify-Increment Extension            June 2006

Full Copyright Statement

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 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.

Acknowledgement

Funding for the RFC Editor function is provided by the IETF
   Administrative Support Activity (IASA).

Zeilenga                     Informational                      [Page 6]

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