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171 lines
5.1 KiB
Plaintext
171 lines
5.1 KiB
Plaintext
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Network Working Group T. Howes
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Request for Comments: 1558 University of Michigan
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Category: Informational December 1993
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A String Representation of LDAP Search Filters
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Status of this Memo
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This memo provides information for the Internet community. This memo
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does not specify an Internet standard of any kind. Distribution of
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this memo is unlimited.
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Abstract
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The Lightweight Directory Access Protocol (LDAP) [1] defines a
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network representation of a search filter transmitted to an LDAP
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server. Some applications may find it useful to have a common way of
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representing these search filters in a human-readable form. This
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document defines a human-readable string format for representing LDAP
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search filters.
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1. LDAP Search Filter Definition
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An LDAP search filter is defined in [1] as follows:
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Filter ::= CHOICE {
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and [0] SET OF Filter,
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or [1] SET OF Filter,
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not [2] Filter,
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equalityMatch [3] AttributeValueAssertion,
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substrings [4] SubstringFilter,
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greaterOrEqual [5] AttributeValueAssertion,
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lessOrEqual [6] AttributeValueAssertion,
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present [7] AttributeType,
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approxMatch [8] AttributeValueAssertion
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}
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SubstringFilter ::= SEQUENCE {
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type AttributeType,
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SEQUENCE OF CHOICE {
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initial [0] LDAPString,
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any [1] LDAPString,
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final [2] LDAPString
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}
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}
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Howes [Page 1]
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RFC 1558 Representation of LDAP Filters December 1993
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AttributeValueAssertion ::= SEQUENCE
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attributeType AttributeType,
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attributeValue AttributeValue
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}
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AttributeType ::= LDAPString
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AttributeValue ::= OCTET STRING
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LDAPString ::= OCTET STRING
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where the LDAPString above is limited to the IA5 character set. The
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AttributeType is a string representation of the attribute object
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identifier in dotted OID format (e.g., "2.5.4.10"), or the shorter
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string name of the attribute (e.g., "organizationName", or "o"). The
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AttributeValue OCTET STRING has the form defined in [2]. The Filter
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is encoded for transmission over a network using the Basic Encoding
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Rules defined in [3], with simplifications described in [1].
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2. String Search Filter Definition
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The string representation of an LDAP search filter is defined by the
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following BNF. It uses a prefix format.
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<filter> ::= '(' <filtercomp> ')'
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<filtercomp> ::= <and> | <or> | <not> | <item>
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<and> ::= '&' <filterlist>
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<or> ::= '|' <filterlist>
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<not> ::= '!' <filter>
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<filterlist> ::= <filter> | <filter> <filterlist>
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<item> ::= <simple> | <present> | <substring>
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<simple> ::= <attr> <filtertype> <value>
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<filtertype> ::= <equal> | <approx> | <greater> | <less>
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<equal> ::= '='
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<approx> ::= '~='
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<greater> ::= '>='
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<less> ::= '<='
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<present> ::= <attr> '=*'
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<substring> ::= <attr> '=' <initial> <any> <final>
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<initial> ::= NULL | <value>
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<any> ::= '*' <starval>
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<starval> ::= NULL | <value> '*' <starval>
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<final> ::= NULL | <value>
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<attr> is a string representing an AttributeType, and has the format
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defined in [1]. <value> is a string representing an AttributeValue,
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or part of one, and has the form defined in [2]. If a <value> must
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contain one of the characters '*' or '(' or ')', these characters
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Howes [Page 2]
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RFC 1558 Representation of LDAP Filters December 1993
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should be escaped by preceding them with the backslash '\' character.
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3. Examples
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This section gives a few examples of search filters written using
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this notation.
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(cn=Babs Jensen)
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(!(cn=Tim Howes))
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(&(objectClass=Person)(|(sn=Jensen)(cn=Babs J*)))
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(o=univ*of*mich*)
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4. Security Considerations
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Security issues are not discussed in this memo.
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5. References
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[1] Yeong, W., Howes, T., and S. Kille, "Lightweight Directory Access
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Protocol", RFC 1487, Performance Systems International,
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University of Michigan, ISODE Consortium, July 1993.
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[2] Howes, T., Kille, S., Yeong, W., and C. Robbins, "The String
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Representation of Standard Attribute Syntaxes", RFC 1488,
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University of Michigan, ISODE Consortium, Performance Systems
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International, NeXor Ltd., July 1993.
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[3] "Specification of Basic Encoding Rules for Abstract Syntax
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Notation One (ASN.1)", CCITT Recommendation X.209, 1988.
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6. Author's Address
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Tim Howes
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University of Michigan
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ITD Research Systems
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535 W William St.
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Ann Arbor, MI 48103-4943
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USA
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Phone: +1 313 747-4454
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EMail: tim@umich.edu
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Howes [Page 3]
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