Network Working Group S. Legg, Ed.
Request for Comments: 4517 eB2Bcom
Obsoletes: 2252, 2256 June 2006
Updates: 3698
Category: Standards Track
Lightweight Directory Access Protocol (LDAP):
Syntaxes and Matching Rules
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
Each attribute stored in a Lightweight Directory Access Protocol
(LDAP) directory, whose values may be transferred in the LDAP
protocol, has a defined syntax that constrains the structure and
format of its values. The comparison semantics for values of a
syntax are not part of the syntax definition but are instead provided
through separately defined matching rules. Matching rules specify an
argument, an assertion value, which also has a defined syntax. This
document defines a base set of syntaxes and matching rules for use in
defining attributes for LDAP directories.
Table of Contents
1. Introduction ....................................................3
2. Conventions .....................................................4
3. Syntaxes ........................................................4
3.1. General Considerations .....................................5
3.2. Common Definitions .........................................5
3.3. Syntax Definitions .........................................6
3.3.1. Attribute Type Description ..........................6
3.3.2. Bit String ..........................................6
3.3.3. Boolean .............................................7
3.3.4. Country String ......................................7
3.3.5. Delivery Method .....................................8
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3.3.6. Directory String ....................................8
3.3.7. DIT Content Rule Description ........................9
3.3.8. DIT Structure Rule Description .....................10
3.3.9. DN .................................................10
3.3.10. Enhanced Guide ....................................11
3.3.11. Facsimile Telephone Number ........................12
3.3.12. Fax ...............................................12
3.3.13. Generalized Time ..................................13
3.3.14. Guide .............................................14
3.3.15. IA5 String ........................................15
3.3.16. Integer ...........................................15
3.3.17. JPEG ..............................................15
3.3.18. LDAP Syntax Description ...........................16
3.3.19. Matching Rule Description .........................16
3.3.20. Matching Rule Use Description .....................17
3.3.21. Name and Optional UID .............................17
3.3.22. Name Form Description .............................18
3.3.23. Numeric String ....................................18
3.3.24. Object Class Description ..........................18
3.3.25. Octet String ......................................19
3.3.26. OID ...............................................19
3.3.27. Other Mailbox .....................................20
3.3.28. Postal Address ....................................20
3.3.29. Printable String ..................................21
3.3.30. Substring Assertion ...............................22
3.3.31. Telephone Number ..................................23
3.3.32. Teletex Terminal Identifier .......................23
3.3.33. Telex Number ......................................24
3.3.34. UTC Time ..........................................24
4. Matching Rules .................................................25
4.1. General Considerations ....................................25
4.2. Matching Rule Definitions .................................27
4.2.1. bitStringMatch .....................................27
4.2.2. booleanMatch .......................................28
4.2.3. caseExactIA5Match ..................................28
4.2.4. caseExactMatch .....................................29
4.2.5. caseExactOrderingMatch .............................29
4.2.6. caseExactSubstringsMatch ...........................30
4.2.7. caseIgnoreIA5Match .................................30
4.2.8. caseIgnoreIA5SubstringsMatch .......................31
4.2.9. caseIgnoreListMatch ................................31
4.2.10. caseIgnoreListSubstringsMatch .....................32
4.2.11. caseIgnoreMatch ...................................33
4.2.12. caseIgnoreOrderingMatch ...........................33
4.2.13. caseIgnoreSubstringsMatch .........................34
4.2.14. directoryStringFirstComponentMatch ................34
4.2.15. distinguishedNameMatch ............................35
4.2.16. generalizedTimeMatch ..............................36
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4.2.17. generalizedTimeOrderingMatch ......................36
4.2.18. integerFirstComponentMatch ........................36
4.2.19. integerMatch ......................................37
4.2.20. integerOrderingMatch ..............................37
4.2.21. keywordMatch ......................................38
4.2.22. numericStringMatch ................................38
4.2.23. numericStringOrderingMatch ........................39
4.2.24. numericStringSubstringsMatch ......................39
4.2.25. objectIdentifierFirstComponentMatch ...............40
4.2.26. objectIdentifierMatch .............................40
4.2.27. octetStringMatch ..................................41
4.2.28. octetStringOrderingMatch ..........................41
4.2.29. telephoneNumberMatch ..............................42
4.2.30. telephoneNumberSubstringsMatch ....................42
4.2.31. uniqueMemberMatch .................................43
4.2.32. wordMatch .........................................44
5. Security Considerations ........................................44
6. Acknowledgements ...............................................44
7. IANA Considerations ............................................45
8. References .....................................................46
8.1. Normative References ......................................46
8.2. Informative References ....................................48
Appendix A. Summary of Syntax Object Identifiers ..................49
Appendix B. Changes from RFC 2252 .................................49
1. Introduction
Each attribute stored in a Lightweight Directory Access Protocol
(LDAP) directory [RFC4510], whose values may be transferred in the
LDAP protocol [RFC4511], has a defined syntax (i.e., data type) that
constrains the structure and format of its values. The comparison
semantics for values of a syntax are not part of the syntax
definition but are instead provided through separately defined
matching rules. Matching rules specify an argument, an assertion
value, which also has a defined syntax. This document defines a base
set of syntaxes and matching rules for use in defining attributes for
LDAP directories.
Readers are advised to familiarize themselves with the Directory
Information Models [RFC4512] before reading the rest of this
document. Section 3 provides definitions for the base set of LDAP
syntaxes. Section 4 provides definitions for the base set of
matching rules for LDAP.
This document is an integral part of the LDAP technical specification
[RFC4510], which obsoletes the previously defined LDAP technical
specification, RFC 3377, in its entirety.
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Sections 4, 5, and 7 of RFC 2252 are obsoleted by [RFC4512]. The
remainder of RFC 2252 is obsoleted by this document. Sections 6 and
8 of RFC 2256 are obsoleted by this document. The remainder of RFC
2256 is obsoleted by [RFC4519] and [RFC4512]. All but Section 2.11
of RFC 3698 is obsoleted by this document.
A number of schema elements that were included in the previous
revision of the LDAP technical specification are not included in this
revision of LDAP. Public Key Infrastructure schema elements are now
specified in [RFC4523]. Unless reintroduced in future technical
specifications, the remainder are to be considered Historic.
The changes with respect to RFC 2252 are described in Appendix B of
this document.
2. Conventions
In this document, the 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, RFC 2119
[RFC2119].
Syntax definitions are written according to the <SyntaxDescription>
ABNF [RFC4234] rule specified in [RFC4512], and matching rule
definitions are written according to the <MatchingRuleDescription>
ABNF rule specified in [RFC4512], except that the syntax and matching
rule definitions provided in this document are line-wrapped for
readability. When such definitions are transferred as attribute
values in the LDAP protocol (e.g., as values of the ldapSyntaxes and
matchingRules attributes [RFC4512], respectively), then those values
would not contain line breaks.
3. Syntaxes
Syntax definitions constrain the structure of attribute values stored
in an LDAP directory, and determine the representation of attribute
and assertion values transferred in the LDAP protocol.
Syntaxes that are required for directory operation, or that are in
common use, are specified in this section. Servers SHOULD recognize
all the syntaxes listed in this document, but are not required to
otherwise support them, and MAY recognise or support other syntaxes.
However, the definition of additional arbitrary syntaxes is
discouraged since it will hinder interoperability. Client and server
implementations typically do not have the ability to dynamically
recognize new syntaxes.
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RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
3.1. General Considerations
The description of each syntax specifies how attribute or assertion
values conforming to the syntax are to be represented when
transferred in the LDAP protocol [RFC4511]. This representation is
referred to as the LDAP-specific encoding to distinguish it from
other methods of encoding attribute values (e.g., the Basic Encoding
Rules (BER) encoding [BER] used by X.500 [X.500] directories).
The LDAP-specific encoding of a given attribute syntax always
produces octet-aligned values. To the greatest extent possible,
encoding rules for LDAP syntaxes should produce character strings
that can be displayed with little or no translation by clients
implementing LDAP. However, clients MUST NOT assume that the LDAP-
specific encoding of a value of an unrecognized syntax is a human-
readable character string. There are a few cases (e.g., the JPEG
syntax) when it is not reasonable to produce a human-readable
representation.
Each LDAP syntax is uniquely identified with an object identifier
[ASN.1] represented in the dotted-decimal format (short descriptive
names are not defined for syntaxes). These object identifiers are
not intended to be displayed to users. The object identifiers for
the syntaxes defined in this document are summarized in Appendix A.
A suggested minimum upper bound on the number of characters in an
attribute value with a string-based syntax, or the number of octets
in a value for all other syntaxes, MAY be indicated by appending the
bound inside of curly braces following the syntax's OBJECT IDENTIFIER
in an attribute type definition (see the <noidlen> rule in
[RFC4512]). Such a bound is not considered part of the syntax
identifier.
For example, "1.3.6.1.4.1.1466.115.121.1.15{64}" in an attribute
definition suggests that the directory server will allow a value of
the attribute to be up to 64 characters long, although it may allow
longer character strings. Note that a single character of the
Directory String syntax can be encoded in more than one octet, since
UTF-8 [RFC3629] is a variable-length encoding. Therefore, a 64-
character string may be more than 64 octets in length.
3.2. Common Definitions
The following ABNF rules are used in a number of the syntax
definitions in Section 3.3.
PrintableCharacter = ALPHA / DIGIT / SQUOTE / LPAREN / RPAREN /
PLUS / COMMA / HYPHEN / DOT / EQUALS /
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SLASH / COLON / QUESTION / SPACE
PrintableString = 1*PrintableCharacter
IA5String = *(%x00-7F)
SLASH = %x2F ; forward slash ("/")
COLON = %x3A ; colon (":")
QUESTION = %x3F ; question mark ("?")
The <ALPHA>, <DIGIT>, <SQUOTE>, <LPAREN>, <RPAREN>, <PLUS>, <COMMA>,
<HYPHEN>, <DOT>, <EQUALS>, and <SPACE> rules are defined in
[RFC4512].
3.3. Syntax Definitions
3.3.1. Attribute Type Description
A value of the Attribute Type Description syntax is the definition of
an attribute type. The LDAP-specific encoding of a value of this
syntax is defined by the <AttributeTypeDescription> rule in
[RFC4512].
For example, the following definition of the createTimestamp
attribute type from [RFC4512] is also a value of the Attribute
Type Description syntax. (Note: Line breaks have been added for
readability; they are not part of the value when transferred in
protocol.)
( 2.5.18.1 NAME 'createTimestamp'
EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24
SINGLE-VALUE NO-USER-MODIFICATION
USAGE directoryOperation )
The LDAP definition for the Attribute Type Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.3 DESC 'Attribute Type Description' )
This syntax corresponds to the AttributeTypeDescription ASN.1 type
from [X.501].
3.3.2. Bit String
A value of the Bit String syntax is a sequence of binary digits. The
LDAP-specific encoding of a value of this syntax is defined by the
following ABNF:
BitString = SQUOTE *binary-digit SQUOTE "B"
binary-digit = "0" / "1"
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The <SQUOTE> rule is defined in [RFC4512].
Example:
'0101111101'B
The LDAP definition for the Bit String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.6 DESC 'Bit String' )
This syntax corresponds to the BIT STRING ASN.1 type from [ASN.1].
3.3.3. Boolean
A value of the Boolean syntax is one of the Boolean values, true or
false. The LDAP-specific encoding of a value of this syntax is
defined by the following ABNF:
Boolean = "TRUE" / "FALSE"
The LDAP definition for the Boolean syntax is:
( 1.3.6.1.4.1.1466.115.121.1.7 DESC 'Boolean' )
This syntax corresponds to the BOOLEAN ASN.1 type from [ASN.1].
3.3.4. Country String
A value of the Country String syntax is one of the two-character
codes from ISO 3166 [ISO3166] for representing a country. The LDAP-
specific encoding of a value of this syntax is defined by the
following ABNF:
CountryString = 2(PrintableCharacter)
The <PrintableCharacter> rule is defined in Section 3.2.
Examples:
US
AU
The LDAP definition for the Country String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.11 DESC 'Country String' )
This syntax corresponds to the following ASN.1 type from [X.520]:
PrintableString (SIZE (2)) -- ISO 3166 codes only
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3.3.5. Delivery Method
A value of the Delivery Method syntax is a sequence of items that
indicate, in preference order, the service(s) by which an entity is
willing and/or capable of receiving messages. The LDAP-specific
encoding of a value of this syntax is defined by the following ABNF:
DeliveryMethod = pdm *( WSP DOLLAR WSP pdm )
pdm = "any" / "mhs" / "physical" / "telex" / "teletex" /
"g3fax" / "g4fax" / "ia5" / "videotex" / "telephone"
The <WSP> and <DOLLAR> rules are defined in [RFC4512].
Example:
telephone $ videotex
The LDAP definition for the Delivery Method syntax is:
( 1.3.6.1.4.1.1466.115.121.1.14 DESC 'Delivery Method' )
This syntax corresponds to the following ASN.1 type from [X.520]:
SEQUENCE OF INTEGER {
any-delivery-method (0),
mhs-delivery (1),
physical-delivery (2),
telex-delivery (3),
teletex-delivery (4),
g3-facsimile-delivery (5),
g4-facsimile-delivery (6),
ia5-terminal-delivery (7),
videotex-delivery (8),
telephone-delivery (9) }
3.3.6. Directory String
A value of the Directory String syntax is a string of one or more
arbitrary characters from the Universal Character Set (UCS) [UCS]. A
zero-length character string is not permitted. The LDAP-specific
encoding of a value of this syntax is the UTF-8 encoding [RFC3629] of
the character string. Such encodings conform to the following ABNF:
DirectoryString = 1*UTF8
The <UTF8> rule is defined in [RFC4512].
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Example:
This is a value of Directory String containing #!%#@.
Servers and clients MUST be prepared to receive arbitrary UCS code
points, including code points outside the range of printable ASCII
and code points not presently assigned to any character.
Attribute type definitions using the Directory String syntax should
not restrict the format of Directory String values, e.g., by
requiring that the character string conforms to specific patterns
described by ABNF. A new syntax should be defined in such cases.
The LDAP definition for the Directory String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.15 DESC 'Directory String' )
This syntax corresponds to the DirectoryString parameterized ASN.1
type from [X.520].
The DirectoryString ASN.1 type allows a choice between the
TeletexString, PrintableString, or UniversalString ASN.1 types from
[ASN.1]. However, note that the chosen alternative is not indicated
in the LDAP-specific encoding of a Directory String value.
Implementations that convert Directory String values from the LDAP-
specific encoding to the BER encoding used by X.500 must choose an
alternative that permits the particular characters in the string and
must convert the characters from the UTF-8 encoding into the
character encoding of the chosen alternative. When converting
Directory String values from the BER encoding to the LDAP-specific
encoding, the characters must be converted from the character
encoding of the chosen alternative into the UTF-8 encoding. These
conversions SHOULD be done in a manner consistent with the Transcode
step of the string preparation algorithms [RFC4518] for LDAP.
3.3.7. DIT Content Rule Description
A value of the DIT Content Rule Description syntax is the definition
of a DIT (Directory Information Tree) content rule. The LDAP-
specific encoding of a value of this syntax is defined by the
<DITContentRuleDescription> rule in [RFC4512].
Example:
( 2.5.6.4 DESC 'content rule for organization'
NOT ( x121Address $ telexNumber ) )
Note: A line break has been added for readability; it is not part
of the value.
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The LDAP definition for the DIT Content Rule Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.16
DESC 'DIT Content Rule Description' )
This syntax corresponds to the DITContentRuleDescription ASN.1 type
from [X.501].
3.3.8. DIT Structure Rule Description
A value of the DIT Structure Rule Description syntax is the
definition of a DIT structure rule. The LDAP-specific encoding of a
value of this syntax is defined by the <DITStructureRuleDescription>
rule in [RFC4512].
Example:
( 2 DESC 'organization structure rule' FORM 2.5.15.3 )
The LDAP definition for the DIT Structure Rule Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.17
DESC 'DIT Structure Rule Description' )
This syntax corresponds to the DITStructureRuleDescription ASN.1 type
from [X.501].
3.3.9. DN
A value of the DN syntax is the (purported) distinguished name (DN)
of an entry [RFC4512]. The LDAP-specific encoding of a value of this
syntax is defined by the <distinguishedName> rule from the string
representation of distinguished names [RFC4514].
Examples (from [RFC4514]):
UID=jsmith,DC=example,DC=net
OU=Sales+CN=J. Smith,DC=example,DC=net
CN=John Smith\, III,DC=example,DC=net
CN=Before\0dAfter,DC=example,DC=net
1.3.6.1.4.1.1466.0=#04024869,DC=example,DC=com
CN=Lu\C4\8Di\C4\87
The LDAP definition for the DN syntax is:
( 1.3.6.1.4.1.1466.115.121.1.12 DESC 'DN' )
The DN syntax corresponds to the DistinguishedName ASN.1 type from
[X.501]. Note that a BER encoded distinguished name (as used by
X.500) re-encoded into the LDAP-specific encoding is not necessarily
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reversible to the original BER encoding since the chosen string type
in any DirectoryString components of the distinguished name is not
indicated in the LDAP-specific encoding of the distinguished name
(see Section 3.3.6).
3.3.10. Enhanced Guide
A value of the Enhanced Guide syntax suggests criteria, which consist
of combinations of attribute types and filter operators, to be used
in constructing filters to search for entries of particular object
classes. The Enhanced Guide syntax improves upon the Guide syntax by
allowing the recommended depth of the search to be specified.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
EnhancedGuide = object-class SHARP WSP criteria WSP
SHARP WSP subset
object-class = WSP oid WSP
subset = "baseobject" / "oneLevel" / "wholeSubtree"
criteria = and-term *( BAR and-term )
and-term = term *( AMPERSAND term )
term = EXCLAIM term /
attributetype DOLLAR match-type /
LPAREN criteria RPAREN /
true /
false
match-type = "EQ" / "SUBSTR" / "GE" / "LE" / "APPROX"
true = "?true"
false = "?false"
BAR = %x7C ; vertical bar ("|")
AMPERSAND = %x26 ; ampersand ("&")
EXCLAIM = %x21 ; exclamation mark ("!")
The <SHARP>, <WSP>, <oid>, <LPAREN>, <RPAREN>, <attributetype>, and
<DOLLAR> rules are defined in [RFC4512].
The LDAP definition for the Enhanced Guide syntax is:
( 1.3.6.1.4.1.1466.115.121.1.21 DESC 'Enhanced Guide' )
Example:
person#(sn$EQ)#oneLevel
The Enhanced Guide syntax corresponds to the EnhancedGuide ASN.1 type
from [X.520]. The EnhancedGuide type references the Criteria ASN.1
type, also from [X.520]. The <true> rule, above, represents an empty
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"and" expression in a value of the Criteria type. The <false> rule,
above, represents an empty "or" expression in a value of the Criteria
type.
3.3.11. Facsimile Telephone Number
A value of the Facsimile Telephone Number syntax is a subscriber
number of a facsimile device on the public switched telephone
network. The LDAP-specific encoding of a value of this syntax is
defined by the following ABNF:
fax-number = telephone-number *( DOLLAR fax-parameter )
telephone-number = PrintableString
fax-parameter = "twoDimensional" /
"fineResolution" /
"unlimitedLength" /
"b4Length" /
"a3Width" /
"b4Width" /
"uncompressed"
The <telephone-number> is a string of printable characters that
complies with the internationally agreed format for representing
international telephone numbers [E.123]. The <PrintableString> rule
is defined in Section 3.2. The <DOLLAR> rule is defined in
[RFC4512].
The LDAP definition for the Facsimile Telephone Number syntax is:
( 1.3.6.1.4.1.1466.115.121.1.22 DESC 'Facsimile Telephone Number')
The Facsimile Telephone Number syntax corresponds to the
FacsimileTelephoneNumber ASN.1 type from [X.520].
3.3.12. Fax
A value of the Fax syntax is an image that is produced using the
Group 3 facsimile process [FAX] to duplicate an object, such as a
memo. The LDAP-specific encoding of a value of this syntax is the
string of octets for a Group 3 Fax image as defined in [FAX].
The LDAP definition for the Fax syntax is:
( 1.3.6.1.4.1.1466.115.121.1.23 DESC 'Fax' )
The ASN.1 type corresponding to the Fax syntax is defined as follows,
assuming EXPLICIT TAGS:
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Fax ::= CHOICE {
g3-facsimile [3] G3FacsimileBodyPart
}
The G3FacsimileBodyPart ASN.1 type is defined in [X.420].
3.3.13. Generalized Time
A value of the Generalized Time syntax is a character string
representing a date and time. The LDAP-specific encoding of a value
of this syntax is a restriction of the format defined in [ISO8601],
and is described by the following ABNF:
GeneralizedTime = century year month day hour
[ minute [ second / leap-second ] ]
[ fraction ]
g-time-zone
century = 2(%x30-39) ; "00" to "99"
year = 2(%x30-39) ; "00" to "99"
month = ( %x30 %x31-39 ) ; "01" (January) to "09"
/ ( %x31 %x30-32 ) ; "10" to "12"
day = ( %x30 %x31-39 ) ; "01" to "09"
/ ( %x31-32 %x30-39 ) ; "10" to "29"
/ ( %x33 %x30-31 ) ; "30" to "31"
hour = ( %x30-31 %x30-39 ) / ( %x32 %x30-33 ) ; "00" to "23"
minute = %x30-35 %x30-39 ; "00" to "59"
second = ( %x30-35 %x30-39 ) ; "00" to "59"
leap-second = ( %x36 %x30 ) ; "60"
fraction = ( DOT / COMMA ) 1*(%x30-39)
g-time-zone = %x5A ; "Z"
/ g-differential
g-differential = ( MINUS / PLUS ) hour [ minute ]
MINUS = %x2D ; minus sign ("-")
The <DOT>, <COMMA>, and <PLUS> rules are defined in [RFC4512].
The above ABNF allows character strings that do not represent valid
dates (in the Gregorian calendar) and/or valid times (e.g., February
31, 1994). Such character strings SHOULD be considered invalid for
this syntax.
The time value represents coordinated universal time (equivalent to
Greenwich Mean Time) if the "Z" form of <g-time-zone> is used;
otherwise, the value represents a local time in the time zone
indicated by <g-differential>. In the latter case, coordinated
Legg Standards Track [Page 13]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
universal time can be calculated by subtracting the differential from
the local time. The "Z" form of <g-time-zone> SHOULD be used in
preference to <g-differential>.
If <minute> is omitted, then <fraction> represents a fraction of an
hour; otherwise, if <second> and <leap-second> are omitted, then
<fraction> represents a fraction of a minute; otherwise, <fraction>
represents a fraction of a second.
Examples:
199412161032Z
199412160532-0500
Both example values represent the same coordinated universal time:
10:32 AM, December 16, 1994.
The LDAP definition for the Generalized Time syntax is:
( 1.3.6.1.4.1.1466.115.121.1.24 DESC 'Generalized Time' )
This syntax corresponds to the GeneralizedTime ASN.1 type from
[ASN.1], with the constraint that local time without a differential
SHALL NOT be used.
3.3.14. Guide
A value of the Guide syntax suggests criteria, which consist of
combinations of attribute types and filter operators, to be used in
constructing filters to search for entries of particular object
classes. The Guide syntax is obsolete and should not be used for
defining new attribute types.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
Guide = [ object-class SHARP ] criteria
The <object-class> and <criteria> rules are defined in Section
3.3.10. The <SHARP> rule is defined in [RFC4512].
The LDAP definition for the Guide syntax is:
( 1.3.6.1.4.1.1466.115.121.1.25 DESC 'Guide' )
The Guide syntax corresponds to the Guide ASN.1 type from [X.520].
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3.3.15. IA5 String
A value of the IA5 String syntax is a string of zero, one, or more
characters from International Alphabet 5 (IA5) [T.50], the
international version of the ASCII character set. The LDAP-specific
encoding of a value of this syntax is the unconverted string of
characters, which conforms to the <IA5String> rule in Section 3.2.
The LDAP definition for the IA5 String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.26 DESC 'IA5 String' )
This syntax corresponds to the IA5String ASN.1 type from [ASN.1].
3.3.16. Integer
A value of the Integer syntax is a whole number of unlimited
magnitude. The LDAP-specific encoding of a value of this syntax is
the optionally signed decimal digit character string representation
of the number (for example, the number 1321 is represented by the
character string "1321"). The encoding is defined by the following
ABNF:
Integer = ( HYPHEN LDIGIT *DIGIT ) / number
The <HYPHEN>, <LDIGIT>, <DIGIT>, and <number> rules are defined in
[RFC4512].
The LDAP definition for the Integer syntax is:
( 1.3.6.1.4.1.1466.115.121.1.27 DESC 'INTEGER' )
This syntax corresponds to the INTEGER ASN.1 type from [ASN.1].
3.3.17. JPEG
A value of the JPEG syntax is an image in the JPEG File Interchange
Format (JFIF), as described in [JPEG]. The LDAP-specific encoding of
a value of this syntax is the sequence of octets of the JFIF encoding
of the image.
The LDAP definition for the JPEG syntax is:
( 1.3.6.1.4.1.1466.115.121.1.28 DESC 'JPEG' )
The JPEG syntax corresponds to the following ASN.1 type:
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JPEG ::= OCTET STRING (CONSTRAINED BY
{ -- contents octets are an image in the --
-- JPEG File Interchange Format -- })
3.3.18. LDAP Syntax Description
A value of the LDAP Syntax Description syntax is the description of
an LDAP syntax. The LDAP-specific encoding of a value of this syntax
is defined by the <SyntaxDescription> rule in [RFC4512].
The LDAP definition for the LDAP Syntax Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.54 DESC 'LDAP Syntax Description' )
The above LDAP definition for the LDAP Syntax Description syntax is
itself a legal value of the LDAP Syntax Description syntax.
The ASN.1 type corresponding to the LDAP Syntax Description syntax is
defined as follows, assuming EXPLICIT TAGS:
LDAPSyntaxDescription ::= SEQUENCE {
identifier OBJECT IDENTIFIER,
description DirectoryString { ub-schema } OPTIONAL }
The DirectoryString parameterized ASN.1 type is defined in [X.520].
The value of ub-schema (an integer) is implementation defined. A
non-normative definition appears in [X.520].
3.3.19. Matching Rule Description
A value of the Matching Rule Description syntax is the definition of
a matching rule. The LDAP-specific encoding of a value of this
syntax is defined by the <MatchingRuleDescription> rule in [RFC4512].
Example:
( 2.5.13.2 NAME 'caseIgnoreMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Note: A line break has been added for readability; it is not part of
the syntax.
The LDAP definition for the Matching Rule Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.30 DESC 'Matching Rule Description' )
This syntax corresponds to the MatchingRuleDescription ASN.1 type
from [X.501].
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3.3.20. Matching Rule Use Description
A value of the Matching Rule Use Description syntax indicates the
attribute types to which a matching rule may be applied in an
extensibleMatch search filter [RFC4511]. The LDAP-specific encoding
of a value of this syntax is defined by the
<MatchingRuleUseDescription> rule in [RFC4512].
Example:
( 2.5.13.16 APPLIES ( givenName $ surname ) )
The LDAP definition for the Matching Rule Use Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.31
DESC 'Matching Rule Use Description' )
This syntax corresponds to the MatchingRuleUseDescription ASN.1 type
from [X.501].
3.3.21. Name and Optional UID
A value of the Name and Optional UID syntax is the distinguished name
[RFC4512] of an entity optionally accompanied by a unique identifier
that serves to differentiate the entity from others with an identical
distinguished name.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
NameAndOptionalUID = distinguishedName [ SHARP BitString ]
The <BitString> rule is defined in Section 3.3.2. The
<distinguishedName> rule is defined in [RFC4514]. The <SHARP> rule
is defined in [RFC4512].
Note that although the '#' character may occur in the string
representation of a distinguished name, no additional escaping of
this character is performed when a <distinguishedName> is encoded in
a <NameAndOptionalUID>.
Example:
1.3.6.1.4.1.1466.0=#04024869,O=Test,C=GB#'0101'B
The LDAP definition for the Name and Optional UID syntax is:
( 1.3.6.1.4.1.1466.115.121.1.34 DESC 'Name And Optional UID' )
Legg Standards Track [Page 17]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
This syntax corresponds to the NameAndOptionalUID ASN.1 type from
[X.520].
3.3.22. Name Form Description
A value of the Name Form Description syntax is the definition of a
name form, which regulates how entries may be named. The LDAP-
specific encoding of a value of this syntax is defined by the
<NameFormDescription> rule in [RFC4512].
Example:
( 2.5.15.3 NAME 'orgNameForm' OC organization MUST o )
The LDAP definition for the Name Form Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.35 DESC 'Name Form Description' )
This syntax corresponds to the NameFormDescription ASN.1 type from
[X.501].
3.3.23. Numeric String
A value of the Numeric String syntax is a sequence of one or more
numerals and spaces. The LDAP-specific encoding of a value of this
syntax is the unconverted string of characters, which conforms to the
following ABNF:
NumericString = 1*(DIGIT / SPACE)
The <DIGIT> and <SPACE> rules are defined in [RFC4512].
Example:
15 079 672 281
The LDAP definition for the Numeric String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.36 DESC 'Numeric String' )
This syntax corresponds to the NumericString ASN.1 type from [ASN.1].
3.3.24. Object Class Description
A value of the Object Class Description syntax is the definition of
an object class. The LDAP-specific encoding of a value of this
syntax is defined by the <ObjectClassDescription> rule in [RFC4512].
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Example:
( 2.5.6.2 NAME 'country' SUP top STRUCTURAL MUST c
MAY ( searchGuide $ description ) )
Note: A line break has been added for readability; it is not part of
the syntax.
The LDAP definition for the Object Class Description syntax is:
( 1.3.6.1.4.1.1466.115.121.1.37 DESC 'Object Class Description' )
This syntax corresponds to the ObjectClassDescription ASN.1 type from
[X.501].
3.3.25. Octet String
A value of the Octet String syntax is a sequence of zero, one, or
more arbitrary octets. The LDAP-specific encoding of a value of this
syntax is the unconverted sequence of octets, which conforms to the
following ABNF:
OctetString = *OCTET
The <OCTET> rule is defined in [RFC4512]. Values of this syntax are
not generally human-readable.
The LDAP definition for the Octet String syntax is:
( 1.3.6.1.4.1.1466.115.121.1.40 DESC 'Octet String' )
This syntax corresponds to the OCTET STRING ASN.1 type from [ASN.1].
3.3.26. OID
A value of the OID syntax is an object identifier: a sequence of two
or more non-negative integers that uniquely identify some object or
item of specification. Many of the object identifiers used in LDAP
also have IANA registered names [RFC4520].
The LDAP-specific encoding of a value of this syntax is defined by
the <oid> rule in [RFC4512].
Examples:
1.2.3.4
cn
The LDAP definition for the OID syntax is:
Legg Standards Track [Page 19]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
( 1.3.6.1.4.1.1466.115.121.1.38 DESC 'OID' )
This syntax corresponds to the OBJECT IDENTIFIER ASN.1 type from
[ASN.1].
3.3.27. Other Mailbox
A value of the Other Mailbox syntax identifies an electronic mailbox,
in a particular named mail system. The LDAP-specific encoding of a
value of this syntax is defined by the following ABNF:
OtherMailbox = mailbox-type DOLLAR mailbox
mailbox-type = PrintableString
mailbox = IA5String
The <mailbox-type> rule represents the type of mail system in which
the mailbox resides (for example, "MCIMail"), and <mailbox> is the
actual mailbox in the mail system described by <mailbox-type>. The
<PrintableString> and <IA5String> rules are defined in Section 3.2.
The <DOLLAR> rule is defined in [RFC4512].
The LDAP definition for the Other Mailbox syntax is:
( 1.3.6.1.4.1.1466.115.121.1.39 DESC 'Other Mailbox' )
The ASN.1 type corresponding to the Other Mailbox syntax is defined
as follows, assuming EXPLICIT TAGS:
OtherMailbox ::= SEQUENCE {
mailboxType PrintableString,
mailbox IA5String
}
3.3.28. Postal Address
A value of the Postal Address syntax is a sequence of strings of one
or more arbitrary UCS characters, which form an address in a physical
mail system.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
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PostalAddress = line *( DOLLAR line )
line = 1*line-char
line-char = %x00-23
/ (%x5C "24") ; escaped "$"
/ %x25-5B
/ (%x5C "5C") ; escaped "\"
/ %x5D-7F
/ UTFMB
Each character string (i.e., <line>) of a postal address value is
encoded as a UTF-8 [RFC3629] string, except that "\" and "$"
characters, if they occur in the string, are escaped by a "\"
character followed by the two hexadecimal digit code for the
character. The <DOLLAR> and <UTFMB> rules are defined in [RFC4512].
Many servers limit the postal address to no more than six lines of no
more than thirty characters each.
Example:
1234 Main St.$Anytown, CA 12345$USA
\241,000,000 Sweepstakes$PO Box 1000000$Anytown, CA 12345$USA
The LDAP definition for the Postal Address syntax is:
( 1.3.6.1.4.1.1466.115.121.1.41 DESC 'Postal Address' )
This syntax corresponds to the PostalAddress ASN.1 type from [X.520];
that is
PostalAddress ::= SEQUENCE SIZE(1..ub-postal-line) OF
DirectoryString { ub-postal-string }
The values of ub-postal-line and ub-postal-string (both integers) are
implementation defined. Non-normative definitions appear in [X.520].
3.3.29. Printable String
A value of the Printable String syntax is a string of one or more
latin alphabetic, numeric, and selected punctuation characters as
specified by the <PrintableCharacter> rule in Section 3.2.
The LDAP-specific encoding of a value of this syntax is the
unconverted string of characters, which conforms to the
<PrintableString> rule in Section 3.2.
Example:
This is a PrintableString.
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The LDAP definition for the PrintableString syntax is:
( 1.3.6.1.4.1.1466.115.121.1.44 DESC 'Printable String' )
This syntax corresponds to the PrintableString ASN.1 type from
[ASN.1].
3.3.30. Substring Assertion
A value of the Substring Assertion syntax is a sequence of zero, one,
or more character substrings used as an argument for substring
extensible matching of character string attribute values; i.e., as
the matchValue of a MatchingRuleAssertion [RFC4511]. Each substring
is a string of one or more arbitrary characters from the Universal
Character Set (UCS) [UCS]. A zero-length substring is not permitted.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
SubstringAssertion = [ initial ] any [ final ]
initial = substring
any = ASTERISK *(substring ASTERISK)
final = substring
ASTERISK = %x2A ; asterisk ("*")
substring = 1*substring-character
substring-character = %x00-29
/ (%x5C "2A") ; escaped "*"
/ %x2B-5B
/ (%x5C "5C") ; escaped "\"
/ %x5D-7F
/ UTFMB
Each <substring> of a Substring Assertion value is encoded as a UTF-8
[RFC3629] string, except that "\" and "*" characters, if they occur
in the substring, are escaped by a "\" character followed by the two
hexadecimal digit code for the character.
The Substring Assertion syntax is used only as the syntax of
assertion values in the extensible match. It is not used as an
attribute syntax, or in the SubstringFilter [RFC4511].
The LDAP definition for the Substring Assertion syntax is:
( 1.3.6.1.4.1.1466.115.121.1.58 DESC 'Substring Assertion' )
Legg Standards Track [Page 22]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
This syntax corresponds to the SubstringAssertion ASN.1 type from
[X.520].
3.3.31. Telephone Number
A value of the Telephone Number syntax is a string of printable
characters that complies with the internationally agreed format for
representing international telephone numbers [E.123].
The LDAP-specific encoding of a value of this syntax is the
unconverted string of characters, which conforms to the
<PrintableString> rule in Section 3.2.
Examples:
+1 512 315 0280
+1-512-315-0280
+61 3 9896 7830
The LDAP definition for the Telephone Number syntax is:
( 1.3.6.1.4.1.1466.115.121.1.50 DESC 'Telephone Number' )
The Telephone Number syntax corresponds to the following ASN.1 type
from [X.520]:
PrintableString (SIZE(1..ub-telephone-number))
The value of ub-telephone-number (an integer) is implementation
defined. A non-normative definition appears in [X.520].
3.3.32. Teletex Terminal Identifier
A value of this syntax specifies the identifier and (optionally)
parameters of a teletex terminal.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
teletex-id = ttx-term *(DOLLAR ttx-param)
ttx-term = PrintableString ; terminal identifier
ttx-param = ttx-key COLON ttx-value ; parameter
ttx-key = "graphic" / "control" / "misc" / "page" / "private"
ttx-value = *ttx-value-octet
ttx-value-octet = %x00-23
/ (%x5C "24") ; escaped "$"
/ %x25-5B
/ (%x5C "5C") ; escaped "\"
Legg Standards Track [Page 23]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
/ %x5D-FF
The <PrintableString> and <COLON> rules are defined in Section 3.2.
The <DOLLAR> rule is defined in [RFC4512].
The LDAP definition for the Teletex Terminal Identifier syntax is:
( 1.3.6.1.4.1.1466.115.121.1.51
DESC 'Teletex Terminal Identifier' )
This syntax corresponds to the TeletexTerminalIdentifier ASN.1 type
from [X.520].
3.3.33. Telex Number
A value of the Telex Number syntax specifies the telex number,
country code, and answerback code of a telex terminal.
The LDAP-specific encoding of a value of this syntax is defined by
the following ABNF:
telex-number = actual-number DOLLAR country-code
DOLLAR answerback
actual-number = PrintableString
country-code = PrintableString
answerback = PrintableString
The <PrintableString> rule is defined in Section 3.2. The <DOLLAR>
rule is defined in [RFC4512].
The LDAP definition for the Telex Number syntax is:
( 1.3.6.1.4.1.1466.115.121.1.52 DESC 'Telex Number' )
This syntax corresponds to the TelexNumber ASN.1 type from [X.520].
3.3.34. UTC Time
A value of the UTC Time syntax is a character string representing a
date and time to a precision of one minute or one second. The year
is given as a two-digit number. The LDAP-specific encoding of a
value of this syntax follows the format defined in [ASN.1] for the
UTCTime type and is described by the following ABNF:
UTCTime = year month day hour minute [ second ]
[ u-time-zone ]
u-time-zone = %x5A ; "Z"
/ u-differential
Legg Standards Track [Page 24]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
u-differential = ( MINUS / PLUS ) hour minute
The <year>, <month>, <day>, <hour>, <minute>, <second>, and <MINUS>
rules are defined in Section 3.3.13. The <PLUS> rule is defined in
[RFC4512].
The above ABNF allows character strings that do not represent valid
dates (in the Gregorian calendar) and/or valid times. Such character
strings SHOULD be considered invalid for this syntax.
The time value represents coordinated universal time if the "Z" form
of <u-time-zone> is used; otherwise, the value represents a local
time. In the latter case, if <u-differential> is provided, then
coordinated universal time can be calculated by subtracting the
differential from the local time. The <u-time-zone> SHOULD be
present in time values, and the "Z" form of <u-time-zone> SHOULD be
used in preference to <u-differential>.
The LDAP definition for the UTC Time syntax is:
( 1.3.6.1.4.1.1466.115.121.1.53 DESC 'UTC Time' )
Note: This syntax is deprecated in favor of the Generalized Time
syntax.
The UTC Time syntax corresponds to the UTCTime ASN.1 type from
[ASN.1].
4. Matching Rules
Matching rules are used by directory implementations to compare
attribute values against assertion values when performing Search and
Compare operations [RFC4511]. They are also used when comparing a
purported distinguished name [RFC4512] with the name of an entry.
When modifying entries, matching rules are used to identify values to
be deleted and to prevent an attribute from containing two equal
values.
Matching rules that are required for directory operation, or that are
in common use, are specified in this section.
4.1. General Considerations
A matching rule is applied to attribute values through an
AttributeValueAssertion or MatchingRuleAssertion [RFC4511]. The
conditions under which an AttributeValueAssertion or
MatchingRuleAssertion evaluates to Undefined are specified elsewhere
[RFC4511]. If an assertion is not Undefined, then the result of the
Legg Standards Track [Page 25]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
assertion is the result of applying the selected matching rule. A
matching rule evaluates to TRUE, and in some cases Undefined, as
specified in the description of the matching rule; otherwise, it
evaluates to FALSE.
Each assertion contains an assertion value. The definition of each
matching rule specifies the syntax for the assertion value. The
syntax of the assertion value is typically, but not necessarily, the
same as the syntax of the attribute values to which the matching rule
may be applied. Note that an AssertionValue in a SubstringFilter
[RFC4511] conforms to the assertion syntax of the equality matching
rule for the attribute type rather than to the assertion syntax of
the substrings matching rule for the attribute type. Conceptually,
the entire SubstringFilter is converted into an assertion value of
the substrings matching rule prior to applying the rule.
The definition of each matching rule indicates the attribute syntaxes
to which the rule may be applied, by specifying conditions the
corresponding ASN.1 type of a candidate attribute syntax must
satisfy. These conditions are also satisfied if the corresponding
ASN.1 type is a tagged or constrained derivative of the ASN.1 type
explicitly mentioned in the rule description (i.e., ASN.1 tags and
constraints are ignored in checking applicability), or is an
alternative reference notation for the explicitly mentioned type.
Each rule description lists, as examples of applicable attribute
syntaxes, the complete list of the syntaxes defined in this document
to which the matching rule applies. A matching rule may be
applicable to additional syntaxes defined in other documents if those
syntaxes satisfy the conditions on the corresponding ASN.1 type.
The description of each matching rule indicates whether the rule is
suitable for use as the equality matching rule (EQUALITY), ordering
matching rule (ORDERING), or substrings matching rule (SUBSTR) in an
attribute type definition [RFC4512].
Each matching rule is uniquely identified with an object identifier.
The definition of a matching rule should not subsequently be changed.
If a change is desirable, then a new matching rule with a different
object identifier should be defined instead.
Servers MAY implement the wordMatch and keywordMatch matching rules,
but they SHOULD implement the other matching rules in Section 4.2.
Servers MAY implement additional matching rules.
Servers that implement the extensibleMatch filter SHOULD allow the
matching rules listed in Section 4.2 to be used in the
extensibleMatch filter and SHOULD allow matching rules to be used
with all attribute types known to the server, where the assertion
Legg Standards Track [Page 26]
RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
syntax of the matching rule is the same as the value syntax of the
attribute.
Servers MUST publish, in the matchingRules attribute, the definitions
of matching rules referenced by values of the attributeTypes and
matchingRuleUse attributes in the same subschema entry. Other
unreferenced matching rules MAY be published in the matchingRules
attribute.
If the server supports the extensibleMatch filter, then the server
MAY use the matchingRuleUse attribute to indicate the applicability
(in an extensibleMatch filter) of selected matching rules to
nominated attribute types.
4.2. Matching Rule Definitions
Nominated character strings in assertion and attribute values are
prepared according to the string preparation algorithms [RFC4518] for
LDAP when evaluating the following matching rules:
numericStringMatch,
numericStringSubstringsMatch,
caseExactMatch,
caseExactOrderingMatch,
caseExactSubstringsMatch,
caseExactIA5Match,
caseIgnoreIA5Match,
caseIgnoreIA5SubstringsMatch,
caseIgnoreListMatch,
caseIgnoreListSubstringsMatch,
caseIgnoreMatch,
caseIgnoreOrderingMatch,
caseIgnoreSubstringsMatch,
directoryStringFirstComponentMatch,
telephoneNumberMatch,
telephoneNumberSubstringsMatch and
wordMatch.
The Transcode, Normalize, Prohibit, and Check bidi steps are the same
for each of the matching rules. However, the Map and Insignificant
Character Handling steps depend on the specific rule, as detailed in
the description of these matching rules in the sections that follow.
4.2.1. bitStringMatch
The bitStringMatch rule compares an assertion value of the Bit String
syntax to an attribute value of a syntax (e.g., the Bit String
syntax) whose corresponding ASN.1 type is BIT STRING.
Legg Standards Track [Page 27]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
If the corresponding ASN.1 type of the attribute syntax does not have
a named bit list [ASN.1] (which is the case for the Bit String
syntax), then the rule evaluates to TRUE if and only if the attribute
value has the same number of bits as the assertion value and the bits
match on a bitwise basis.
If the corresponding ASN.1 type does have a named bit list, then
bitStringMatch operates as above, except that trailing zero bits in
the attribute and assertion values are treated as absent.
The LDAP definition for the bitStringMatch rule is:
( 2.5.13.16 NAME 'bitStringMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.6 )
The bitStringMatch rule is an equality matching rule.
4.2.2. booleanMatch
The booleanMatch rule compares an assertion value of the Boolean
syntax to an attribute value of a syntax (e.g., the Boolean syntax)
whose corresponding ASN.1 type is BOOLEAN.
The rule evaluates to TRUE if and only if the attribute value and the
assertion value are both TRUE or both FALSE.
The LDAP definition for the booleanMatch rule is:
( 2.5.13.13 NAME 'booleanMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 )
The booleanMatch rule is an equality matching rule.
4.2.3. caseExactIA5Match
The caseExactIA5Match rule compares an assertion value of the IA5
String syntax to an attribute value of a syntax (e.g., the IA5 String
syntax) whose corresponding ASN.1 type is IA5String.
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
Legg Standards Track [Page 28]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
The LDAP definition for the caseExactIA5Match rule is:
( 1.3.6.1.4.1.1466.109.114.1 NAME 'caseExactIA5Match'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
The caseExactIA5Match rule is an equality matching rule.
4.2.4. caseExactMatch
The caseExactMatch rule compares an assertion value of the Directory
String syntax to an attribute value of a syntax (e.g., the Directory
String, Printable String, Country String, or Telephone Number syntax)
whose corresponding ASN.1 type is DirectoryString or one of the
alternative string types of DirectoryString, such as PrintableString
(the other alternatives do not correspond to any syntax defined in
this document).
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseExactMatch rule is:
( 2.5.13.5 NAME 'caseExactMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
The caseExactMatch rule is an equality matching rule.
4.2.5. caseExactOrderingMatch
The caseExactOrderingMatch rule compares an assertion value of the
Directory String syntax to an attribute value of a syntax (e.g., the
Directory String, Printable String, Country String, or Telephone
Number syntax) whose corresponding ASN.1 type is DirectoryString or
one of its alternative string types.
The rule evaluates to TRUE if and only if, in the code point
collation order, the prepared attribute value character string
appears earlier than the prepared assertion value character string;
i.e., the attribute value is "less than" the assertion value.
Legg Standards Track [Page 29]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseExactOrderingMatch rule is:
( 2.5.13.6 NAME 'caseExactOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
The caseExactOrderingMatch rule is an ordering matching rule.
4.2.6. caseExactSubstringsMatch
The caseExactSubstringsMatch rule compares an assertion value of the
Substring Assertion syntax to an attribute value of a syntax (e.g.,
the Directory String, Printable String, Country String, or Telephone
Number syntax) whose corresponding ASN.1 type is DirectoryString or
one of its alternative string types.
The rule evaluates to TRUE if and only if (1) the prepared substrings
of the assertion value match disjoint portions of the prepared
attribute value character string in the order of the substrings in
the assertion value, (2) an <initial> substring, if present, matches
the beginning of the prepared attribute value character string, and
(3) a <final> substring, if present, matches the end of the prepared
attribute value character string. A prepared substring matches a
portion of the prepared attribute value character string if
corresponding characters have the same code point.
In preparing the attribute value and assertion value substrings for
comparison, characters are not case folded in the Map preparation
step, and only Insignificant Space Handling is applied in the
Insignificant Character Handling step.
The LDAP definition for the caseExactSubstringsMatch rule is:
( 2.5.13.7 NAME 'caseExactSubstringsMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The caseExactSubstringsMatch rule is a substrings matching rule.
4.2.7. caseIgnoreIA5Match
The caseIgnoreIA5Match rule compares an assertion value of the IA5
String syntax to an attribute value of a syntax (e.g., the IA5 String
syntax) whose corresponding ASN.1 type is IA5String.
Legg Standards Track [Page 30]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseIgnoreIA5Match rule is:
( 1.3.6.1.4.1.1466.109.114.2 NAME 'caseIgnoreIA5Match'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
The caseIgnoreIA5Match rule is an equality matching rule.
4.2.8. caseIgnoreIA5SubstringsMatch
The caseIgnoreIA5SubstringsMatch rule compares an assertion value of
the Substring Assertion syntax to an attribute value of a syntax
(e.g., the IA5 String syntax) whose corresponding ASN.1 type is
IA5String.
The rule evaluates to TRUE if and only if (1) the prepared substrings
of the assertion value match disjoint portions of the prepared
attribute value character string in the order of the substrings in
the assertion value, (2) an <initial> substring, if present, matches
the beginning of the prepared attribute value character string, and
(3) a <final> substring, if present, matches the end of the prepared
attribute value character string. A prepared substring matches a
portion of the prepared attribute value character string if
corresponding characters have the same code point.
In preparing the attribute value and assertion value substrings for
comparison, characters are case folded in the Map preparation step,
and only Insignificant Space Handling is applied in the Insignificant
Character Handling step.
( 1.3.6.1.4.1.1466.109.114.3 NAME 'caseIgnoreIA5SubstringsMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The caseIgnoreIA5SubstringsMatch rule is a substrings matching rule.
4.2.9. caseIgnoreListMatch
The caseIgnoreListMatch rule compares an assertion value that is a
sequence of strings to an attribute value of a syntax (e.g., the
Legg Standards Track [Page 31]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
Postal Address syntax) whose corresponding ASN.1 type is a SEQUENCE
OF the DirectoryString ASN.1 type.
The rule evaluates to TRUE if and only if the attribute value and the
assertion value have the same number of strings and corresponding
strings (by position) match according to the caseIgnoreMatch matching
rule.
In [X.520], the assertion syntax for this matching rule is defined to
be:
SEQUENCE OF DirectoryString {ub-match}
That is, it is different from the corresponding type for the Postal
Address syntax. The choice of the Postal Address syntax for the
assertion syntax of the caseIgnoreListMatch in LDAP should not be
seen as limiting the matching rule to apply only to attributes with
the Postal Address syntax.
The LDAP definition for the caseIgnoreListMatch rule is:
( 2.5.13.11 NAME 'caseIgnoreListMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.41 )
The caseIgnoreListMatch rule is an equality matching rule.
4.2.10. caseIgnoreListSubstringsMatch
The caseIgnoreListSubstringsMatch rule compares an assertion value of
the Substring Assertion syntax to an attribute value of a syntax
(e.g., the Postal Address syntax) whose corresponding ASN.1 type is a
SEQUENCE OF the DirectoryString ASN.1 type.
The rule evaluates to TRUE if and only if the assertion value
matches, per the caseIgnoreSubstringsMatch rule, the character string
formed by concatenating the strings of the attribute value, except
that none of the <initial>, <any>, or <final> substrings of the
assertion value are considered to match a substring of the
concatenated string which spans more than one of the original strings
of the attribute value.
Note that, in terms of the LDAP-specific encoding of the Postal
Address syntax, the concatenated string omits the <DOLLAR> line
separator and the escaping of "\" and "$" characters.
The LDAP definition for the caseIgnoreListSubstringsMatch rule is:
( 2.5.13.12 NAME 'caseIgnoreListSubstringsMatch'
Legg Standards Track [Page 32]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The caseIgnoreListSubstringsMatch rule is a substrings matching rule.
4.2.11. caseIgnoreMatch
The caseIgnoreMatch rule compares an assertion value of the Directory
String syntax to an attribute value of a syntax (e.g., the Directory
String, Printable String, Country String, or Telephone Number syntax)
whose corresponding ASN.1 type is DirectoryString or one of its
alternative string types.
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseIgnoreMatch rule is:
( 2.5.13.2 NAME 'caseIgnoreMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
The caseIgnoreMatch rule is an equality matching rule.
4.2.12. caseIgnoreOrderingMatch
The caseIgnoreOrderingMatch rule compares an assertion value of the
Directory String syntax to an attribute value of a syntax (e.g., the
Directory String, Printable String, Country String, or Telephone
Number syntax) whose corresponding ASN.1 type is DirectoryString or
one of its alternative string types.
The rule evaluates to TRUE if and only if, in the code point
collation order, the prepared attribute value character string
appears earlier than the prepared assertion value character string;
i.e., the attribute value is "less than" the assertion value.
In preparing the attribute value and assertion value for comparison,
characters are case folded in the Map preparation step, and only
Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseIgnoreOrderingMatch rule is:
Legg Standards Track [Page 33]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
( 2.5.13.3 NAME 'caseIgnoreOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
The caseIgnoreOrderingMatch rule is an ordering matching rule.
4.2.13. caseIgnoreSubstringsMatch
The caseIgnoreSubstringsMatch rule compares an assertion value of the
Substring Assertion syntax to an attribute value of a syntax (e.g.,
the Directory String, Printable String, Country String, or Telephone
Number syntax) whose corresponding ASN.1 type is DirectoryString or
one of its alternative string types.
The rule evaluates to TRUE if and only if (1) the prepared substrings
of the assertion value match disjoint portions of the prepared
attribute value character string in the order of the substrings in
the assertion value, (2) an <initial> substring, if present, matches
the beginning of the prepared attribute value character string, and
(3) a <final> substring, if present, matches the end of the prepared
attribute value character string. A prepared substring matches a
portion of the prepared attribute value character string if
corresponding characters have the same code point.
In preparing the attribute value and assertion value substrings for
comparison, characters are case folded in the Map preparation step,
and only Insignificant Space Handling is applied in the Insignificant
Character Handling step.
The LDAP definition for the caseIgnoreSubstringsMatch rule is:
( 2.5.13.4 NAME 'caseIgnoreSubstringsMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The caseIgnoreSubstringsMatch rule is a substrings matching rule.
4.2.14. directoryStringFirstComponentMatch
The directoryStringFirstComponentMatch rule compares an assertion
value of the Directory String syntax to an attribute value of a
syntax whose corresponding ASN.1 type is a SEQUENCE with a mandatory
first component of the DirectoryString ASN.1 type.
Note that the assertion syntax of this matching rule differs from the
attribute syntax of attributes for which this is the equality
matching rule.
Legg Standards Track [Page 34]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
The rule evaluates to TRUE if and only if the assertion value matches
the first component of the attribute value using the rules of
caseIgnoreMatch.
The LDAP definition for the directoryStringFirstComponentMatch
matching rule is:
( 2.5.13.31 NAME 'directoryStringFirstComponentMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
The directoryStringFirstComponentMatch rule is an equality matching
rule. When using directoryStringFirstComponentMatch to compare two
attribute values (of an applicable syntax), an assertion value must
first be derived from one of the attribute values. An assertion
value can be derived from an attribute value by taking the first
component of that attribute value.
4.2.15. distinguishedNameMatch
The distinguishedNameMatch rule compares an assertion value of the DN
syntax to an attribute value of a syntax (e.g., the DN syntax) whose
corresponding ASN.1 type is DistinguishedName.
The rule evaluates to TRUE if and only if the attribute value and the
assertion value have the same number of relative distinguished names
and corresponding relative distinguished names (by position) are the
same. A relative distinguished name (RDN) of the assertion value is
the same as an RDN of the attribute value if and only if they have
the same number of attribute value assertions and each attribute
value assertion (AVA) of the first RDN is the same as the AVA of the
second RDN with the same attribute type. The order of the AVAs is
not significant. Also note that a particular attribute type may
appear in at most one AVA in an RDN. Two AVAs with the same
attribute type are the same if their values are equal according to
the equality matching rule of the attribute type. If one or more of
the AVA comparisons evaluate to Undefined and the remaining AVA
comparisons return TRUE then the distinguishedNameMatch rule
evaluates to Undefined.
The LDAP definition for the distinguishedNameMatch rule is:
( 2.5.13.1 NAME 'distinguishedNameMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.12 )
The distinguishedNameMatch rule is an equality matching rule.
Legg Standards Track [Page 35]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
4.2.16. generalizedTimeMatch
The generalizedTimeMatch rule compares an assertion value of the
Generalized Time syntax to an attribute value of a syntax (e.g., the
Generalized Time syntax) whose corresponding ASN.1 type is
GeneralizedTime.
The rule evaluates to TRUE if and only if the attribute value
represents the same universal coordinated time as the assertion
value. If a time is specified with the minutes or seconds absent,
then the number of minutes or seconds (respectively) is assumed to be
zero.
The LDAP definition for the generalizedTimeMatch rule is:
( 2.5.13.27 NAME 'generalizedTimeMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 )
The generalizedTimeMatch rule is an equality matching rule.
4.2.17. generalizedTimeOrderingMatch
The generalizedTimeOrderingMatch rule compares the time ordering of
an assertion value of the Generalized Time syntax to an attribute
value of a syntax (e.g., the Generalized Time syntax) whose
corresponding ASN.1 type is GeneralizedTime.
The rule evaluates to TRUE if and only if the attribute value
represents a universal coordinated time that is earlier than the
universal coordinated time represented by the assertion value.
The LDAP definition for the generalizedTimeOrderingMatch rule is:
( 2.5.13.28 NAME 'generalizedTimeOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 )
The generalizedTimeOrderingMatch rule is an ordering matching rule.
4.2.18. integerFirstComponentMatch
The integerFirstComponentMatch rule compares an assertion value of
the Integer syntax to an attribute value of a syntax (e.g., the DIT
Structure Rule Description syntax) whose corresponding ASN.1 type is
a SEQUENCE with a mandatory first component of the INTEGER ASN.1
type.
Legg Standards Track [Page 36]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
Note that the assertion syntax of this matching rule differs from the
attribute syntax of attributes for which this is the equality
matching rule.
The rule evaluates to TRUE if and only if the assertion value and the
first component of the attribute value are the same integer value.
The LDAP definition for the integerFirstComponentMatch matching rule
is:
( 2.5.13.29 NAME 'integerFirstComponentMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 )
The integerFirstComponentMatch rule is an equality matching rule.
When using integerFirstComponentMatch to compare two attribute values
(of an applicable syntax), an assertion value must first be derived
from one of the attribute values. An assertion value can be derived
from an attribute value by taking the first component of that
attribute value.
4.2.19. integerMatch
The integerMatch rule compares an assertion value of the Integer
syntax to an attribute value of a syntax (e.g., the Integer syntax)
whose corresponding ASN.1 type is INTEGER.
The rule evaluates to TRUE if and only if the attribute value and the
assertion value are the same integer value.
The LDAP definition for the integerMatch matching rule is:
( 2.5.13.14 NAME 'integerMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 )
The integerMatch rule is an equality matching rule.
4.2.20. integerOrderingMatch
The integerOrderingMatch rule compares an assertion value of the
Integer syntax to an attribute value of a syntax (e.g., the Integer
syntax) whose corresponding ASN.1 type is INTEGER.
The rule evaluates to TRUE if and only if the integer value of the
attribute value is less than the integer value of the assertion
value.
The LDAP definition for the integerOrderingMatch matching rule is:
Legg Standards Track [Page 37]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
( 2.5.13.15 NAME 'integerOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 )
The integerOrderingMatch rule is an ordering matching rule.
4.2.21. keywordMatch
The keywordMatch rule compares an assertion value of the Directory
String syntax to an attribute value of a syntax (e.g., the Directory
String syntax) whose corresponding ASN.1 type is DirectoryString.
The rule evaluates to TRUE if and only if the assertion value
character string matches any keyword in the attribute value. The
identification of keywords in the attribute value and the exactness
of the match are both implementation specific.
The LDAP definition for the keywordMatch rule is:
( 2.5.13.33 NAME 'keywordMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
4.2.22. numericStringMatch
The numericStringMatch rule compares an assertion value of the
Numeric String syntax to an attribute value of a syntax (e.g., the
Numeric String syntax) whose corresponding ASN.1 type is
NumericString.
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
numericString Insignificant Character Handling is applied in the
Insignificant Character Handling step.
The LDAP definition for the numericStringMatch matching rule is:
( 2.5.13.8 NAME 'numericStringMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.36 )
The numericStringMatch rule is an equality matching rule.
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4.2.23. numericStringOrderingMatch
The numericStringOrderingMatch rule compares an assertion value of
the Numeric String syntax to an attribute value of a syntax (e.g.,
the Numeric String syntax) whose corresponding ASN.1 type is
NumericString.
The rule evaluates to TRUE if and only if, in the code point
collation order, the prepared attribute value character string
appears earlier than the prepared assertion value character string;
i.e., the attribute value is "less than" the assertion value.
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
numericString Insignificant Character Handling is applied in the
Insignificant Character Handling step.
The rule is identical to the caseIgnoreOrderingMatch rule except that
all space characters are skipped during comparison (case is
irrelevant as the characters are numeric).
The LDAP definition for the numericStringOrderingMatch matching rule
is:
( 2.5.13.9 NAME 'numericStringOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.36 )
The numericStringOrderingMatch rule is an ordering matching rule.
4.2.24. numericStringSubstringsMatch
The numericStringSubstringsMatch rule compares an assertion value of
the Substring Assertion syntax to an attribute value of a syntax
(e.g., the Numeric String syntax) whose corresponding ASN.1 type is
NumericString.
The rule evaluates to TRUE if and only if (1) the prepared substrings
of the assertion value match disjoint portions of the prepared
attribute value character string in the order of the substrings in
the assertion value, (2) an <initial> substring, if present, matches
the beginning of the prepared attribute value character string, and
(3) a <final> substring, if present, matches the end of the prepared
attribute value character string. A prepared substring matches a
portion of the prepared attribute value character string if
corresponding characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are not case folded in the Map preparation step, and only
Legg Standards Track [Page 39]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
numericString Insignificant Character Handling is applied in the
Insignificant Character Handling step.
The LDAP definition for the numericStringSubstringsMatch matching
rule is:
( 2.5.13.10 NAME 'numericStringSubstringsMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The numericStringSubstringsMatch rule is a substrings matching rule.
4.2.25. objectIdentifierFirstComponentMatch
The objectIdentifierFirstComponentMatch rule compares an assertion
value of the OID syntax to an attribute value of a syntax (e.g., the
Attribute Type Description, DIT Content Rule Description, LDAP Syntax
Description, Matching Rule Description, Matching Rule Use
Description, Name Form Description, or Object Class Description
syntax) whose corresponding ASN.1 type is a SEQUENCE with a mandatory
first component of the OBJECT IDENTIFIER ASN.1 type.
Note that the assertion syntax of this matching rule differs from the
attribute syntax of attributes for which this is the equality
matching rule.
The rule evaluates to TRUE if and only if the assertion value matches
the first component of the attribute value using the rules of
objectIdentifierMatch.
The LDAP definition for the objectIdentifierFirstComponentMatch
matching rule is:
( 2.5.13.30 NAME 'objectIdentifierFirstComponentMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 )
The objectIdentifierFirstComponentMatch rule is an equality matching
rule. When using objectIdentifierFirstComponentMatch to compare two
attribute values (of an applicable syntax), an assertion value must
first be derived from one of the attribute values. An assertion
value can be derived from an attribute value by taking the first
component of that attribute value.
4.2.26. objectIdentifierMatch
The objectIdentifierMatch rule compares an assertion value of the OID
syntax to an attribute value of a syntax (e.g., the OID syntax) whose
corresponding ASN.1 type is OBJECT IDENTIFIER.
Legg Standards Track [Page 40]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
The rule evaluates to TRUE if and only if the assertion value and the
attribute value represent the same object identifier; that is, the
same sequence of integers, whether represented explicitly in the
<numericoid> form of <oid> or implicitly in the <descr> form (see
[RFC4512]).
If an LDAP client supplies an assertion value in the <descr> form and
the chosen descriptor is not recognized by the server, then the
objectIdentifierMatch rule evaluates to Undefined.
The LDAP definition for the objectIdentifierMatch matching rule is:
( 2.5.13.0 NAME 'objectIdentifierMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.38 )
The objectIdentifierMatch rule is an equality matching rule.
4.2.27. octetStringMatch
The octetStringMatch rule compares an assertion value of the Octet
String syntax to an attribute value of a syntax (e.g., the Octet
String or JPEG syntax) whose corresponding ASN.1 type is the OCTET
STRING ASN.1 type.
The rule evaluates to TRUE if and only if the attribute value and the
assertion value are the same length and corresponding octets (by
position) are the same.
The LDAP definition for the octetStringMatch matching rule is:
( 2.5.13.17 NAME 'octetStringMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.40 )
The octetStringMatch rule is an equality matching rule.
4.2.28. octetStringOrderingMatch
The octetStringOrderingMatch rule compares an assertion value of the
Octet String syntax to an attribute value of a syntax (e.g., the
Octet String or JPEG syntax) whose corresponding ASN.1 type is the
OCTET STRING ASN.1 type.
The rule evaluates to TRUE if and only if the attribute value appears
earlier in the collation order than the assertion value. The rule
compares octet strings from the first octet to the last octet, and
from the most significant bit to the least significant bit within the
octet. The first occurrence of a different bit determines the
ordering of the strings. A zero bit precedes a one bit. If the
Legg Standards Track [Page 41]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
strings contain different numbers of octets but the longer string is
identical to the shorter string up to the length of the shorter
string, then the shorter string precedes the longer string.
The LDAP definition for the octetStringOrderingMatch matching rule
is:
( 2.5.13.18 NAME 'octetStringOrderingMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.40 )
The octetStringOrderingMatch rule is an ordering matching rule.
4.2.29. telephoneNumberMatch
The telephoneNumberMatch rule compares an assertion value of the
Telephone Number syntax to an attribute value of a syntax (e.g., the
Telephone Number syntax) whose corresponding ASN.1 type is a
PrintableString representing a telephone number.
The rule evaluates to TRUE if and only if the prepared attribute
value character string and the prepared assertion value character
string have the same number of characters and corresponding
characters have the same code point.
In preparing the attribute value and assertion value for comparison,
characters are case folded in the Map preparation step, and only
telephoneNumber Insignificant Character Handling is applied in the
Insignificant Character Handling step.
The LDAP definition for the telephoneNumberMatch matching rule is:
( 2.5.13.20 NAME 'telephoneNumberMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.50 )
The telephoneNumberMatch rule is an equality matching rule.
4.2.30. telephoneNumberSubstringsMatch
The telephoneNumberSubstringsMatch rule compares an assertion value
of the Substring Assertion syntax to an attribute value of a syntax
(e.g., the Telephone Number syntax) whose corresponding ASN.1 type is
a PrintableString representing a telephone number.
The rule evaluates to TRUE if and only if (1) the prepared substrings
of the assertion value match disjoint portions of the prepared
attribute value character string in the order of the substrings in
the assertion value, (2) an <initial> substring, if present, matches
the beginning of the prepared attribute value character string, and
Legg Standards Track [Page 42]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
(3) a <final> substring, if present, matches the end of the prepared
attribute value character string. A prepared substring matches a
portion of the prepared attribute value character string if
corresponding characters have the same code point.
In preparing the attribute value and assertion value substrings for
comparison, characters are case folded in the Map preparation step,
and only telephoneNumber Insignificant Character Handling is applied
in the Insignificant Character Handling step.
The LDAP definition for the telephoneNumberSubstringsMatch matching
rule is:
( 2.5.13.21 NAME 'telephoneNumberSubstringsMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.58 )
The telephoneNumberSubstringsMatch rule is a substrings matching
rule.
4.2.31. uniqueMemberMatch
The uniqueMemberMatch rule compares an assertion value of the Name
And Optional UID syntax to an attribute value of a syntax (e.g., the
Name And Optional UID syntax) whose corresponding ASN.1 type is
NameAndOptionalUID.
The rule evaluates to TRUE if and only if the <distinguishedName>
components of the assertion value and attribute value match according
to the distinguishedNameMatch rule and either, (1) the <BitString>
component is absent from both the attribute value and assertion
value, or (2) the <BitString> component is present in both the
attribute value and the assertion value and the <BitString> component
of the assertion value matches the <BitString> component of the
attribute value according to the bitStringMatch rule.
Note that this matching rule has been altered from its description in
X.520 [X.520] in order to make the matching rule commutative. Server
implementors should consider using the original X.520 semantics
(where the matching was less exact) for approximate matching of
attributes with uniqueMemberMatch as the equality matching rule.
The LDAP definition for the uniqueMemberMatch matching rule is:
( 2.5.13.23 NAME 'uniqueMemberMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.34 )
The uniqueMemberMatch rule is an equality matching rule.
Legg Standards Track [Page 43]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
4.2.32. wordMatch
The wordMatch rule compares an assertion value of the Directory
String syntax to an attribute value of a syntax (e.g., the Directory
String syntax) whose corresponding ASN.1 type is DirectoryString.
The rule evaluates to TRUE if and only if the assertion value word
matches, according to the semantics of caseIgnoreMatch, any word in
the attribute value. The precise definition of a word is
implementation specific.
The LDAP definition for the wordMatch rule is:
( 2.5.13.32 NAME 'wordMatch'
SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
5. Security Considerations
In general, the LDAP-specific encodings for syntaxes defined in this
document do not define canonical encodings. That is, a
transformation from an LDAP-specific encoding into some other
encoding (e.g., BER) and back into the LDAP-specific encoding will
not necessarily reproduce exactly the original octets of the LDAP-
specific encoding. Therefore, an LDAP-specific encoding should not
be used where a canonical encoding is required.
Furthermore, the LDAP-specific encodings do not necessarily enable an
alternative encoding of values of the Directory String and DN
syntaxes to be reconstructed; e.g., a transformation from a
Distinguished Encoding Rules (DER) [BER] encoding to an LDAP-specific
encoding and back to a DER encoding may not reproduce the original
DER encoding. Therefore, LDAP-specific encodings should not be used
where reversibility to DER is needed; e.g., for the verification of
digital signatures. Instead, DER or a DER-reversible encoding should
be used.
When interpreting security-sensitive fields (in particular, fields
used to grant or deny access), implementations MUST ensure that any
matching rule comparisons are done on the underlying abstract value,
regardless of the particular encoding used.
6. Acknowledgements
This document is primarily a revision of RFC 2252 by M. Wahl, A.
Coulbeck, T. Howes, and S. Kille. RFC 2252 was a product of the IETF
ASID Working Group.
Legg Standards Track [Page 44]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
This document is based on input from the IETF LDAPBIS working group.
The author would like to thank Kathy Dally for editing the early
drafts of this document, and Jim Sermersheim and Kurt Zeilenga for
their significant contributions to this revision.
7. IANA Considerations
The Internet Assigned Numbers Authority (IANA) has updated the LDAP
descriptors registry [BCP64] as indicated by the following templates:
Subject: Request for LDAP Descriptor Registration Update
Descriptor (short name): see comment
Object Identifier: see comment
Person & email address to contact for further information:
Steven Legg <steven.legg@eb2bcom.com>
Usage: see comment
Specification: RFC 4517
Author/Change Controller: IESG
NAME Type OID
------------------------------------------------------------------
bitStringMatch M 2.5.13.16
booleanMatch M 2.5.13.13
caseExactIA5Match M 1.3.6.1.4.1.1466.109.114.1
caseExactMatch M 2.5.13.5
caseExactOrderingMatch M 2.5.13.6
caseExactSubstringsMatch M 2.5.13.7
caseIgnoreIA5Match M 1.3.6.1.4.1.1466.109.114.2
caseIgnoreListMatch M 2.5.13.11
caseIgnoreListSubstringsMatch M 2.5.13.12
caseIgnoreMatch M 2.5.13.2
caseIgnoreOrderingMatch M 2.5.13.3
caseIgnoreSubstringsMatch M 2.5.13.4
directoryStringFirstComponentMatch M 2.5.13.31
distinguishedNameMatch M 2.5.13.1
generalizedTimeMatch M 2.5.13.27
generalizedTimeOrderingMatch M 2.5.13.28
integerFirstComponentMatch M 2.5.13.29
integerMatch M 2.5.13.14
integerOrderingMatch M 2.5.13.15
keywordMatch M 2.5.13.33
numericStringMatch M 2.5.13.8
numericStringOrderingMatch M 2.5.13.9
numericStringSubstringsMatch M 2.5.13.10
objectIdentifierFirstComponentMatch M 2.5.13.30
octetStringMatch M 2.5.13.17
octetStringOrderingMatch M 2.5.13.18
telephoneNumberMatch M 2.5.13.20
Legg Standards Track [Page 45]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
telephoneNumberSubstringsMatch M 2.5.13.21
uniqueMemberMatch M 2.5.13.23
wordMatch M 2.5.13.32
The descriptor for the object identifier 2.5.13.0 was incorrectly
registered as objectIdentifiersMatch (extraneous \`s') in BCP 64.
It has been changed to the following, with a reference to
RFC 4517.
NAME Type OID
------------------------------------------------------------------
objectIdentifierMatch M 2.5.13.0
Subject: Request for LDAP Descriptor Registration
Descriptor (short name): caseIgnoreIA5SubstringsMatch
Object Identifier: 1.3.6.1.4.1.1466.109.114.3
Person & email address to contact for further information:
Steven Legg <steven.legg@eb2bcom.com>
Usage: other (M)
Specification: RFC 4517
Author/Change Controller: IESG
8. References
8.1. 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., Ed. 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.
Legg Standards Track [Page 46]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
[RFC4514] Zeilenga, K., Ed., "Lightweight Directory Access Protocol
(LDAP): String Representation of Distinguished Names", RFC
4514, June 2006.
[RFC4518] Zeilenga, K., "Lightweight Directory Access Protocol
(LDAP): Internationalized String Preparation", RFC 4518,
June 2006.
[RFC4520] Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
Considerations for the Lightweight Directory Access
Protocol (LDAP)", BCP 64, RFC 4520, June 2006.
[E.123] Notation for national and international telephone numbers,
ITU-T Recommendation E.123, 1988.
[FAX] Standardization of Group 3 facsimile apparatus for
document transmission - Terminal Equipment and Protocols
for Telematic Services, ITU-T Recommendation T.4, 1993
[T.50] International Reference Alphabet (IRA) (Formerly
International Alphabet No. 5 or IA5) Information
Technology - 7-Bit Coded Character Set for Information
Interchange, ITU-T Recommendation T.50, 1992
[X.420] ITU-T Recommendation X.420 (1996) | ISO/IEC 10021-7:1997,
Information Technology - Message Handling Systems (MHS):
Interpersonal messaging system
[X.501] ITU-T Recommendation X.501 (1993) | ISO/IEC 9594-2:1994,
Information Technology - Open Systems Interconnection -
The Directory: Models
[X.520] ITU-T Recommendation X.520 (1993) | ISO/IEC 9594-6:1994,
Information Technology - Open Systems Interconnection -
The Directory: Selected attribute types
[ASN.1] ITU-T Recommendation X.680 (07/02) | ISO/IEC 8824-1:2002,
Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation
[ISO3166] ISO 3166, "Codes for the representation of names of
countries".
[ISO8601] ISO 8601:2004, "Data elements and interchange formats --
Information interchange -- Representation of dates and
times".
Legg Standards Track [Page 47]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
[UCS] Universal Multiple-Octet Coded Character Set (UCS) -
Architecture and Basic Multilingual Plane, ISO/IEC 10646-
1: 1993 (with amendments).
[JPEG] JPEG File Interchange Format (Version 1.02). Eric
Hamilton, C-Cube Microsystems, Milpitas, CA, September 1,
1992.
8.2. Informative References
[RFC4519] Sciberras, A., Ed., "Lightweight Directory Access Protocol
(LDAP): Schema for User Applications", RFC 4519, June
2006.
[RFC4523] Zeilenga, K., "Lightweight Directory Access Protocol
(LDAP) Schema Definitions for X.509 Certificates", RFC
4523, June 2006.
[X.500] ITU-T Recommendation X.500 (1993) | ISO/IEC 9594-1:1994,
Information Technology - Open Systems Interconnection -
The Directory: Overview of concepts, models and services
[BER] ITU-T Recommendation X.690 (07/02) | ISO/IEC 8825-1:2002,
Information technology - ASN.1 encoding rules:
Specification of Basic Encoding Rules (BER), Canonical
Encoding Rules (CER) and Distinguished Encoding Rules
(DER)
Legg Standards Track [Page 48]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
Appendix A. Summary of Syntax Object Identifiers
The following list summarizes the object identifiers assigned to the
syntaxes defined in this document.
Syntax OBJECT IDENTIFIER
==============================================================
Attribute Type Description 1.3.6.1.4.1.1466.115.121.1.3
Bit String 1.3.6.1.4.1.1466.115.121.1.6
Boolean 1.3.6.1.4.1.1466.115.121.1.7
Country String 1.3.6.1.4.1.1466.115.121.1.11
Delivery Method 1.3.6.1.4.1.1466.115.121.1.14
Directory String 1.3.6.1.4.1.1466.115.121.1.15
DIT Content Rule Description 1.3.6.1.4.1.1466.115.121.1.16
DIT Structure Rule Description 1.3.6.1.4.1.1466.115.121.1.17
DN 1.3.6.1.4.1.1466.115.121.1.12
Enhanced Guide 1.3.6.1.4.1.1466.115.121.1.21
Facsimile Telephone Number 1.3.6.1.4.1.1466.115.121.1.22
Fax 1.3.6.1.4.1.1466.115.121.1.23
Generalized Time 1.3.6.1.4.1.1466.115.121.1.24
Guide 1.3.6.1.4.1.1466.115.121.1.25
IA5 String 1.3.6.1.4.1.1466.115.121.1.26
Integer 1.3.6.1.4.1.1466.115.121.1.27
JPEG 1.3.6.1.4.1.1466.115.121.1.28
LDAP Syntax Description 1.3.6.1.4.1.1466.115.121.1.54
Matching Rule Description 1.3.6.1.4.1.1466.115.121.1.30
Matching Rule Use Description 1.3.6.1.4.1.1466.115.121.1.31
Name And Optional UID 1.3.6.1.4.1.1466.115.121.1.34
Name Form Description 1.3.6.1.4.1.1466.115.121.1.35
Numeric String 1.3.6.1.4.1.1466.115.121.1.36
Object Class Description 1.3.6.1.4.1.1466.115.121.1.37
Octet String 1.3.6.1.4.1.1466.115.121.1.40
OID 1.3.6.1.4.1.1466.115.121.1.38
Other Mailbox 1.3.6.1.4.1.1466.115.121.1.39
Postal Address 1.3.6.1.4.1.1466.115.121.1.41
Printable String 1.3.6.1.4.1.1466.115.121.1.44
Substring Assertion 1.3.6.1.4.1.1466.115.121.1.58
Telephone Number 1.3.6.1.4.1.1466.115.121.1.50
Teletex Terminal Identifier 1.3.6.1.4.1.1466.115.121.1.51
Telex Number 1.3.6.1.4.1.1466.115.121.1.52
UTC Time 1.3.6.1.4.1.1466.115.121.1.53
Appendix B. Changes from RFC 2252
This annex lists the significant differences between this
specification and RFC 2252.
Legg Standards Track [Page 49]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
This annex is provided for informational purposes only. It is not a
normative part of this specification.
1. The IESG Note has been removed.
2. The major part of Sections 4, 5 and 7 has been moved to [RFC4512]
and revised. Changes to the parts of these sections moved to
[RFC4512] are detailed in [RFC4512].
3. BNF descriptions of syntax formats have been replaced by ABNF
[RFC4234] specifications.
4. The ambiguous statement in RFC 2252, Section 4.3 regarding the
use of a backslash quoting mechanism to escape separator symbols
has been removed. The escaping mechanism is now explicitly
represented in the ABNF for the syntaxes where this provision
applies.
5. The description of each of the LDAP syntaxes has been expanded so
that they are less dependent on knowledge of X.500 for
interpretation.
6. The relationship of LDAP syntaxes to corresponding ASN.1 type
definitions has been made explicit.
7. The set of characters allowed in a <PrintableString> (formerly
<printablestring>) has been corrected to align with the
PrintableString ASN.1 type in [ASN.1]. Specifically, the double
quote character has been removed and the single quote character
and equals sign have been added.
8. Values of the Directory String, Printable String and Telephone
Number syntaxes are now required to have at least one character.
9. The <DITContentRuleDescription>, <NameFormDescription> and
<DITStructureRuleDescription> rules have been moved to [RFC4512].
10. The corresponding ASN.1 type for the Other Mailbox syntax has
been incorporated from RFC 1274.
11. A corresponding ASN.1 type for the LDAP Syntax Description syntax
has been invented.
12. The Binary syntax has been removed because it was not adequately
specified, implementations with different incompatible
interpretations exist, and it was confused with the ;binary
transfer encoding.
Legg Standards Track [Page 50]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
13. All discussion of transfer options, including the ";binary"
option, has been removed. All imperatives regarding binary
transfer of values have been removed.
14. The Delivery Method, Enhanced Guide, Guide, Octet String, Teletex
Terminal Identifier and Telex Number syntaxes from RFC 2256 have
been incorporated.
15. The <criteria> rule for the Enhanced Guide and Guide syntaxes has
been extended to accommodate empty "and" and "or" expressions.
16. An encoding for the <ttx-value> rule in the Teletex Terminal
Identifier syntax has been defined.
17. The PKI-related syntaxes (Certificate, Certificate List and
Certificate Pair) have been removed. They are reintroduced in
[RFC4523] (as is the Supported Algorithm syntax from RFC 2256).
18. The MHS OR Address syntax has been removed since its
specification (in RFC 2156) is not at draft standard maturity.
19. The DL Submit Permission syntax has been removed as it depends on
the MHS OR Address syntax.
20. The Presentation Address syntax has been removed since its
specification (in RFC 1278) is not at draft standard maturity.
21. The ACI Item, Access Point, Audio, Data Quality, DSA Quality, DSE
Type, LDAP Schema Description, Master And Shadow Access Points,
Modify Rights, Protocol Information, Subtree Specification,
Supplier Information, Supplier Or Consumer and Supplier And
Consumer syntaxes have been removed. These syntaxes are
referenced in RFC 2252, but not defined.
22. The LDAP Schema Definition syntax (defined in RFC 2927) and the
Mail Preference syntax have been removed on the grounds that they
are out of scope for the core specification.
23. The description of each of the matching rules has been expanded
so that they are less dependent on knowledge of X.500 for
interpretation.
24. The caseIgnoreIA5SubstringsMatch matching rule from RFC 2798 has
been added.
25. The caseIgnoreListSubstringsMatch, caseIgnoreOrderingMatch and
caseIgnoreSubstringsMatch matching rules have been added to the
list of matching rules for which the provisions for handling
Legg Standards Track [Page 51]RFC 4517 LDAP: Syntaxes and Matching Rules June 2006
leading, trailing and multiple adjoining whitespace characters
apply (now through string preparation). This is consistent with
the definitions of these matching rules in X.500. The
caseIgnoreIA5SubstringsMatch rule has also been added to the
list.
26. The specification of the octetStringMatch matching rule from
RFC 2256 has been added to this document.
27. The presentationAddressMatch matching rule has been removed as it
depends on an assertion syntax (Presentation Address) that is not
at draft standard maturity.
28. The protocolInformationMatch matching rule has been removed as it
depends on an undefined assertion syntax (Protocol Information).
29. The definitive reference for ASN.1 has been changed from X.208 to
X.680 since X.680 is the version of ASN.1 referred to by X.500.
30. The specification of the caseIgnoreListSubstringsMatch matching
rule from RFC 2798 & X.520 has been added.
31. String preparation algorithms have been applied to the character
string matching rules.
32. The specifications of the booleanMatch, caseExactMatch,
caseExactOrderingMatch, caseExactSubstringsMatch,
directoryStringFirstComponentMatch, integerOrderingMatch,
keywordMatch, numericStringOrderingMatch,
octetStringOrderingMatch and wordMatch matching rules from
RFC 3698 & X.520 have been added.
Author's Address
Steven Legg
eB2Bcom
Suite3, Woodhouse Corporate Centre
935 Station Street
Box Hill North, Victoria 3129
AUSTRALIA
Phone: +61 3 9896 7830
Fax: +61 3 9896 7801
EMail: steven.legg@eb2bcom.com
Legg Standards Track [Page 52]RFC 4517 LDAP: Syntaxes and Matching Rules 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.
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
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this document or the extent to which any license under such rights
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The IETF invites any interested party to bring to its attention any
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Acknowledgement
Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA).
Legg Standards Track [Page 53]
