RFC 4517
Lightweight Directory Access Protocol (LDAP): Syntaxes and Matching Rules
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
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
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.
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.
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 /
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"
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
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].
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.
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
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
"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:
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
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].
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:
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].
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' )
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].
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:
( 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:
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.
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' )
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 "\"
/ %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
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].
(page 25 continued on part 2)
