rfc4515.txt

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RFC 4515     LDAP: String Representation of Search Filters     June 2006


5.  Security Considerations

   This memo describes a string representation of LDAP search filters.
   While the representation itself has no known security implications,
   LDAP search filters do.  They are interpreted by LDAP servers to
   select entries from which data is retrieved.  LDAP servers should
   take care to protect the data they maintain from unauthorized access.

   Please refer to the Security Considerations sections of [RFC4511] and
   [RFC4513] for more information.

6.  Normative References

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

   [RFC3629]   Yergeau, F., "UTF-8, a transformation format of ISO
               10646", STD 63, RFC 3629, November 2003.

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

   [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.

   [RFC4513]   Harrison, R., Ed., "Lightweight Directory Access Protocol
               (LDAP): Authentication Methods and Security Mechanisms",
               RFC 4513, June 2006.

   [RFC4517]   Legg, S., Ed., "Lightweight Directory Access Protocol
               (LDAP): Syntaxes and Matching Rules", RFC 4517, June
               2006.

   [Unicode]   The Unicode Consortium, "The Unicode Standard, Version
               3.2.0" is defined by "The Unicode Standard, Version 3.0"
               (Reading, MA, Addison-Wesley, 2000. ISBN 0-201-61633-5),
               as amended by the "Unicode Standard Annex #27: Unicode
               3.1" (http://www.unicode.org/reports/tr27/) and by the
               "Unicode Standard Annex #28: Unicode 3.2."




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RFC 4515     LDAP: String Representation of Search Filters     June 2006


7.  Informative References

   [RFC4516]   Smith, M., Ed. and T. Howes, "Lightweight Directory
               Access Protocol (LDAP): Uniform Resource Locator", RFC
               4516, June 2006.

   [X.690]     Specification of ASN.1 encoding rules: Basic, Canonical,
               and Distinguished Encoding Rules, ITU-T Recommendation
               X.690, 1994.

8.  Acknowledgements

   This document replaces RFC 2254 by Tim Howes.  RFC 2254 was a product
   of the IETF ASID Working Group.

   Changes included in this revised specification are based upon
   discussions among the authors, discussions within the LDAP (v3)
   Revision Working Group (ldapbis), and discussions within other IETF
   Working Groups.  The contributions of individuals in these working
   groups is gratefully acknowledged.































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RFC 4515     LDAP: String Representation of Search Filters     June 2006


Appendix A: Changes Since RFC 2254

A.1.  Technical Changes

   Replaced [ISO 10646] reference with [Unicode].

   The following technical changes were made to the contents of the
   "String Search Filter Definition" section:

   Added statement that the string representation is a string of UTF-8-
   encoded Unicode characters.

   Revised all of the ABNF to use common productions from [RFC4512].

   Replaced the "value" rule with a new "assertionvalue" rule within the
   "simple", "extensible", and "substring" ("initial", "any", and
   "final") rules.  This matches a change made in [RFC4517].

   Added "(" and ")" around the components of the <extensible>
   subproductions for clarity.

   Revised the "attr", "matchingrule", and "assertionvalue" ABNF to more
   precisely reference productions from the [RFC4512] and [RFC4511]
   documents.

   "String Search Filter Definition" section: replaced "greater" and
   "less" with "greaterorequal" and "lessorequal" to avoid confusion.

   Introduced the "valueencoding" and associated "normal" and "escaped"
   rules to reduce the dependence on descriptive text.  The "normal"
   production restricts filter strings to valid UTF-8 sequences.

   Added a statement about expected behavior in light of RFC 2254's lack
   of a clear definition of "string representation."

A.2.  Editorial Changes

   Changed document title to include "LDAP:" prefix.

   IESG Note: removed note about lack of satisfactory mandatory
   authentication mechanisms.

   Header and "Authors' Addresses" sections: added Mark Smith as the
   document editor and updated affiliation and contact information.

   "Table of Contents" and "Intellectual Property" sections: added.

   Copyright: updated per latest IETF guidelines.



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RFC 4515     LDAP: String Representation of Search Filters     June 2006


   "Abstract" section: separated from introductory material.

   "Introduction" section: new section; separated from the Abstract.
   Updated second paragraph to indicate that RFC 2254 is replaced by
   this document (instead of RFC 1960).  Added reference to the
   [RFC4510] document.

   "LDAP Search Filter Definition" section: made corrections to the LDAP
   search filter ABNF so it matches that used in [RFC4511].

   Clarified the definition of 'value' (now 'assertionvalue') to take
   into account the fact that it is not precisely an AttributeAssertion
   from [RFC4511] Section 4.1.6 (special handling is required for some
   characters).  Added a note that each octet of a character to be
   escaped is replaced by a backslash and two hex digits, which
   represent a single octet.

   "Examples" section: added four additional examples: (seeAlso=),
   (cn:=Betty Rubble), (:1.2.3:=Wilma Flintstone), and
   (1.3.6.1.4.1.1466.0=\04\02\48\69).  Replaced one occurrence of "a
   value" with "an assertion value".  Corrected the description of this
   example: (sn:dn:2.4.6.8.10:=Barney Rubble).  Replaced the numeric OID
   in the first extensible match example with "caseExactMatch" to
   demonstrate use of the descriptive form.  Used "DN" (uppercase) in
   the last extensible match example to remind the reader to treat the
   <dnattrs> production as case insensitive.  Reworded the description
   of the fourth escaping mechanism example to avoid making assumptions
   about byte order.  Added text to the fifth escaping mechanism example
   to spell out what the non-ASCII characters are in Unicode terms.

   "Security Considerations" section: added references to [RFC4511] and
   [RFC4513].

   "Normative References" section: renamed from "References" per new RFC
   guidelines.  Changed from [1] style to [RFC4511] style throughout the
   document.  Added entries for [Unicode], [RFC2119], [RFC4513],
   [RFC4512], and [RFC4510] and updated the UTF-8 reference.  Replaced
   RFC 822 reference with a reference to RFC 4234.

   "Informative References" section: (new section) moved [X.690] to this
   section.  Added a reference to [RFC4516].

   "Acknowledgements" section: added.

   "Appendix A: Changes Since RFC 2254" section: added.

   Surrounded the names of all ABNF productions with "<" and ">" where
   they are used in descriptive text.



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   Replaced all occurrences of "LDAPv3" with "LDAP."

Authors' Addresses

   Mark Smith, Editor
   Pearl Crescent, LLC
   447 Marlpool Dr.
   Saline, MI 48176
   USA

   Phone: [phone]
   EMail: [e-mail]


   Tim Howes
   Opsware, Inc.
   599 N. Mathilda Ave.
   Sunnyvale, CA 94085
   USA

   Phone: [phone]
   EMail: [e-mail]





























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RFC 4515     LDAP: String Representation of Search Filters     June 2006


Full Copyright Statement

   Copyright (C) The Internet Society (2006).

   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.

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   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
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Acknowledgement

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







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