-
INTERNET-DRAFT Kurt D. Zeilenga
Intended Category: Standard Track OpenLDAP Foundation
-Expires in six months 17 May 2002
+Expires in six months 10 February 2005
- LDAP True/False Filters
- <draft-zeilenga-ldap-t-f-02.txt>
+ LDAP Absolute True and False Filters
+ <draft-zeilenga-ldap-t-f-10.txt>
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 Working Group
- mailing list <ietf-ldapext@netscape.com>. Please send editorial
- comments directly to the author <Kurt@OpenLDAP.org>.
+ 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>.
+
+ By submitting this Internet-Draft, I accept the provisions of Section
+ 4 of RFC 3667. By submitting this Internet-Draft, I certify that any
+ applicable patent or other IPR claims of which I am aware have been
+ disclosed, or will be disclosed, and any of which I become aware will
+ be disclosed, in accordance with RFC 3668.
Internet-Drafts are working documents of the Internet Engineering Task
- Force (IETF), its areas, and its working groups. Note that other
+ 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.''
+ 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>.
+ http://www.ietf.org/1id-abstracts.html
+
+ The list of Internet-Draft Shadow Directories can be accessed at
+ http://www.ietf.org/shadow.html
+
+
+ Copyright (C) The Internet Society (2005). All Rights Reserved.
+
+ Please see the Full Copyright section near the end of this document
+ for more information.
+
+
+
- Copyright 2002, The Internet Society. All Rights Reserved.
- Please see the Copyright section near the end of this document for
- more information.
+
+Zeilenga LDAP True & False Filters [Page 1]
+\f
+INTERNET-DRAFT draft-zeilenga-ldap-t-f-10.txt 10 February 2005
Abstract
these filters.
-
-Zeilenga LDAP True/False Filters [Page 1]
-\f
-INTERNET-DRAFT draft-zeilenga-ldap-t-f-02.txt 17 May 2002
-
-
-1. Background and Intended Use
+1. Background
The X.500 Directory Access Protocol (DAP) [X.511] supports absolute
True and False assertions. An 'and' filter with zero elements always
evaluates to True. An 'or' filter with zero elements always evaluates
to False. These filters are commonly used when requesting DSA-
- specific Entries (DSEs) which do not necessarily have objectClass
+ specific Entries (DSEs) which do not necessarily have 'objectClass'
attributes. That is, where "(objectClass=*)" may evaluate to False.
- While LDAPv2 [RFC1777] placed no restriction on the number of elements
- in 'and' and 'or' filter sets, the LDAPv2 string representation
- [RFC1960] could not represent empty 'and' and 'or' filter sets. Due
- to this, LDAPv3 [RFC2251] required 'and' and 'or' filter sets to have
- at least one element. Hence, LDAPv3 does not provide absolute True or
- False filters.
+ While LDAPv2 [RFC1777][RFC3494] placed no restriction on the number of
+ elements in 'and' and 'or' filter sets, the LDAPv2 string
+ representation [RFC1960][RFC3494] could not represent empty 'and' and
+ 'or' filter sets. Due to this, absolute True or False filters were
+ (unfortunately) eliminated from LDAPv3 [Roadmap].
- This documents extends LDAPv3 [RFC2251] to support absolute True and
- False matches by allowing empty 'and' and 'or' and extends the filter
- string representation [RFC2254] to allow empty filter lists.
+ This documents extends LDAPv3 to support absolute True and False
+ assertions by allowing empty 'and' and 'or' in Search filters
+ [Protocol] and extends the filter string representation [Filters] to
+ allow empty filter lists.
+
+ It is noted that certain search operations, such as those used to
+ retrieve subschema information [Models], require use of particular
+ filters. This document does not change these requirements.
+
+ This feature is intended to allow a more direct mapping between DAP
+ and LDAP (as needed to implement DAP-to-LDAP gateways).
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
Implementations of this extension SHALL allow 'and' and 'or' choices
with zero filter elements.
- An 'and' Filter consisting of an empty set of filters SHALL evaluate
- to True. This filter is to represented by the string "(&)".
+ An 'and' filter consisting of an empty set of filters SHALL evaluate
+ to True. This filter is represented by the string "(&)".
+
- An 'or' Filter consisting of an empty set of filters SHALL evaluate to
- False. This filter is to represented by the string "(|)".
+
+Zeilenga LDAP True & False Filters [Page 2]
+\f
+INTERNET-DRAFT draft-zeilenga-ldap-t-f-10.txt 10 February 2005
+
+
+ An 'or' filter consisting of an empty set of filters SHALL evaluate to
+ False. This filter is represented by the string "(|)".
Servers supporting this feature SHOULD publish the Object Identifier
- 1.3.6.1.4.1.4203.1.5.3 as a value of the supportedFeatures [FEATURES]
+ 1.3.6.1.4.1.4203.1.5.3 as a value of the 'supportedFeatures' [RFC3674]
attribute in the root DSE.
Clients supporting this feature SHOULD NOT use the feature unless they
3. Security Considerations
- The (re)introduction of absolute True and False filters does not raise
- any new security considerations.
-
-
-
-Zeilenga LDAP True/False Filters [Page 2]
-\f
-INTERNET-DRAFT draft-zeilenga-ldap-t-f-02.txt 17 May 2002
+ The (re)introduction of absolute True and False filters is not
+ believed to raise any new security considerations.
-
- Implementors of this (or any) LDAP extension should be familiar with
- general LDAP general security considerations [LDAPTS].
+ Implementors of this (or any) LDAPv3 extension should be familiar with
+ general LDAPv3 security considerations [Roadmap].
4. IANA Considerations
- No IANA assignments are requested.
+ Registration of this feature is requested [BCP64bis].
+
+ Subject: Request for LDAP Protocol Mechanism Registration
+ Object Identifier: 1.3.6.1.4.1.4203.1.5.3
+ Description: True/False filters
+ Person & email address to contact for further information:
+ Kurt Zeilenga <kurt@openldap.org>
+ Usage: Feature
+ Specification: RFC XXXX
+ Author/Change Controller: IESG
+ Comments: none
- This document uses the OID 1.3.6.1.4.1.4203.1.5.3 to identify the
- feature described above. This OID was assigned [ASSIGN] by OpenLDAP
- Foundation under its IANA assigned private enterprise allocation
- [PRIVATE] for use in this specification.
+ This OID was assigned [ASSIGN] by OpenLDAP Foundation, under its
+ IANA-assigned private enterprise allocation [PRIVATE], for use in this
+ specification.
5. Author's Address
<Kurt@OpenLDAP.org>
-6. Normative References
+6. References
+
- [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
- Requirement Levels", BCP 14 (also RFC 2119), March 1997.
- [RFC2251] M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
- Protocol (v3)", RFC 2251, December 1997.
- [RFC2254] T. Howes, "A String Representation of LDAP Search Filters",
- RFC 2254, December 1997.
+Zeilenga LDAP True & False Filters [Page 3]
+\f
+INTERNET-DRAFT draft-zeilenga-ldap-t-f-10.txt 10 February 2005
+
- [LDAPTS] J. Hodges, R. Morgan, "Lightweight Directory Access
- Protocol (v3): Technical Specification",
- draft-ietf-ldapbis-ldapv3-ts-xx.txt (a work in progress).
+ [[Note to the RFC Editor: please replace the citation tags used in
+ referencing Internet-Drafts with tags of the form RFCnnnn where
+ possible.]]
- [FEATURES] K. Zeilenga, "Feature Discovery in LDAP",
- draft-zeilenga-ldap-features-xx.txt (a work in progress).
+6.1. Normative References
-7. Informative References
+ [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
+ Requirement Levels", BCP 14 (also RFC 2119), March 1997.
- [RFC1777] Yeong, W., Howes, T., and S. Kille, "Lightweight Directory
- Access Protocol", RFC 1777, March 1995.
+ [Roadmap] Zeilenga, K. (editor), "LDAP: Technical Specification
+ Road Map", draft-ietf-ldapbis-roadmap-xx.txt, a work in
+ progress.
- [RFC1960] T. Howes, "A String Representation of LDAP Search Filters",
- RFC 1960, June 1996.
+ [Protocol] Sermersheim, J. (editor), "LDAP: The Protocol",
+ draft-ietf-ldapbis-protocol-xx.txt, a work in progress.
+ [Models] Zeilenga, K. (editor), "LDAP: Directory Information
+ Models", draft-ietf-ldapbis-models-xx.txt, a work in
+ progress.
+ [Filters] Smith, M. (editor), LDAPbis WG, "LDAP: String
+ Representation of Search Filters",
+ draft-ietf-ldapbis-filter-xx.txt, a work in progress.
+ [Features] Zeilenga, K., "Feature Discovery in LDAP", RFC 3674,
+ December 2003.
-Zeilenga LDAP True/False Filters [Page 3]
+
+6.2. Informative References
+
+ [RFC1777] Yeong, W., Howes, T., and S. Kille, "Lightweight
+ Directory Access Protocol", RFC 1777, March 1995.
+
+ [RFC1960] Howes, T., "A String Representation of LDAP Search
+ Filters", RFC 1960, June 1996.
+
+ [BCP64bis] Zeilenga, K., "IANA Considerations for LDAP",
+ draft-ietf-ldapbis-bcp64-xx.txt, a work in progress.
+
+ [RFC3494] Zeilenga, K., "Lightweight Directory Access Protocol
+ version 2 (LDAPv2) to Historic Status", RFC 3494, March
+ 2003.
+
+ [X.500] International Telecommunication Union -
+ Telecommunication Standardization Sector, "The Directory
+ -- Overview of concepts, models and services,"
+ X.500(1993) (also ISO/IEC 9594-1:1994).
+
+
+
+Zeilenga LDAP True & False Filters [Page 4]
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+INTERNET-DRAFT draft-zeilenga-ldap-t-f-10.txt 10 February 2005
+
+ [X.501] International Telecommunication Union -
+ Telecommunication Standardization Sector, "The Directory
+ -- Models," X.501(1993) (also ISO/IEC 9594-2:1994).
- [X.500] ITU-T Rec. X.500, "The Directory: Overview of Concepts,
- Models and Service", 1993.
+ [X.511] International Telecommunication Union -
+ Telecommunication Standardization Sector, "The
+ Directory: Abstract Service Definition", X.511(1993)
+ (also ISO/IEC 9594-3:1993).
- [X.511] ITU-T Rec. X.511, "The Directory: Abstract Service
- Definition", 1993.
+ [ASSIGN] OpenLDAP Foundation, "OpenLDAP OID Delegations",
+ http://www.openldap.org/foundation/oid-delegate.txt.
- [ASSIGN] OpenLDAP Foundation, "OpenLDAP OID Delegations",
- http://www.openldap.org/foundation/oid-delegate.txt.
+ [PRIVATE] IANA, "Private Enterprise Numbers",
+ http://www.iana.org/assignments/enterprise-numbers.
- [PRIVATE] IANA, "Private Enterprise Numbers",
- http://www.iana.org/assignments/enterprise-numbers.
+Intellectual Property Rights
-Copyright 2002, The Internet Society. All Rights Reserved.
+ The IETF takes no position regarding the validity or scope of any
+ Intellectual Property Rights or other rights that might be claimed to
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- This document and translations of it may be copied and furnished to
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- This document and the information contained herein is provided on an
- "AS IS" basis and THE AUTHORS, THE INTERNET SOCIETY, AND THE INTERNET
- ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
+
+
+Full Copyright
+
+ Copyright (C) The Internet Society (2005). 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.
+
+
+
+Zeilenga LDAP True & False Filters [Page 5]
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+ 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
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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.
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projects / openldap / blobdiff