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draft-ietf-asid-ldapv3-attributes-04.txt
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Network Working Group M. Wahl
INTERNET-DRAFT Critical Angle Inc.
Obsoletes: RFC 1778 A. Coulbeck
Isode Limited
T. Howes
Netscape Communications Corp.
S. Kille
Isode Limited
Intended Category: Standards Track 24 March 1997
Lightweight Directory Access Protocol (v3):
Attribute Syntax Definitions
<draft-ietf-asid-ldapv3-attributes-04.txt>
1. Status of this Memo
This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas, and
its working groups. Note that other groups may also distribute working
documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference material
or to cite them other than as "work in progress."
To learn the current status of any Internet-Draft, please check the
"1id-abstracts.txt" listing contained in the Internet-Drafts Shadow
Directories on ds.internic.net (US East Coast), nic.nordu.net (Europe),
ftp.isi.edu (US West Coast), or munnari.oz.au (Pacific Rim).
2. Abstract
The Lightweight Directory Access Protocol (LDAP) [1] requires that the
contents of AttributeValue fields in protocol elements be octet
strings. This document defines a set of syntaxes for LDAPv3, and the
rules by which attribute values of these syntaxes are represented as
octet strings for transmission in the LDAP protocol. The syntaxes
defined in this document are referenced by this and other documents that
define attribute types. This document also defines the set of attribute
types which LDAP servers should support.
3. Overview
Section 4 states the general requirements and notations for attribute
types, object classes, syntax and matching rule definitions.
Section 5 lists attributes, section 6 syntaxes and section 7 object
classes.
4. General Issues
This document describes encodings used in an Internet protocol. Terms are
defined in [4].
Wahl, Coulbeck, Howes, Kille Page 1
INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
4.1. Attribute Types
The attribute types are described by sample values for the subschema
"attributeTypes" attribute, which is written in the
AttributeTypeDescription syntax. While lines have been folded for
readability, the values transferred in protocol would not contain
newlines.
The AttributeTypeDescription is encoded according to the following BNF,
and the productions for <oid>, <DirectoryStrings> and <DirectoryString>
are given in sections 4.2.1.
<AttributeTypeDescription> ::= "("
<oid> -- AttributeType identifier
[ "NAME" <DirectoryStrings> ] -- name used in AttributeType
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
[ "SUP" <oid> ] -- derived from this other AttributeType
[ "EQUALITY" <oid> ] -- Matching Rule name
[ "ORDERING" <oid> ] -- Matching Rule name
[ "SUBSTR" <oid> ] -- Matching Rule name
[ "SYNTAX" <DirectoryString> ] -- see section 4.2
[ "SINGLE-VALUE" ] -- default multi-valued
[ "COLLECTIVE" ] -- default not collective
[ "NO-USER-MODIFICATION" ] -- default user modifiable
[ "USAGE" <AttributeUsage> ] -- default user applications
")"
<AttributeUsage> ::=
"userApplications"
| "directoryOperation"
| "distributedOperation" -- DSA-shared
| "dSAOperation" -- DSA-specific, value depends on server
Servers are not required to provide the same or any text
in the description part of the subschema values they maintain.
Servers SHOULD implement all the attribute types referenced in section 5:
they MUST be able to perform equality matching of values, but need not
perform any additional validity checks on attribute values.
Servers MAY recognize additional names and attributes not listed in this
document, and if they do so, SHOULD publish the definitions of the types
in the attributeTypes attribute of their subschema subentries.
AttributeDescriptions can be used as the value in a NAME part of an
AttributeTypeDescription. Note that these are case insensitive.
4.2. Syntaxes
This section defines general requirements for LDAP attribute value
syntax encodings. All documents defining attribute syntax encodings for
use with LDAP are expected to conform to these requirements.
Wahl, Coulbeck, Howes, Kille Page 2
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The encoding rules defined for a given attribute syntax must produce
octet strings. To the greatest extent possible, encoded octet
strings should be usable in their native encoded form for display
purposes. In particular, encoding rules for attribute syntaxes
defining non-binary values should produce strings that can be
displayed with little or no translation by clients implementing
LDAP. There are a few cases (e.g. Audio) however, when it is not sensible
to produce a printable representation, and clients MUST NOT assume that
an unrecognized syntax is a string representation.
4.2.1. Common Encoding Aspects
In these encodings where an arbitrary string is used as part of a larger
production (other than a Distinguished Name), a backslash quoting mechanism
is used to encode the following separator symbol character (such as ''',
'$' or '#') if it should occur in that string. The backslash is followed
by a pair of hexadecimal digits representing the next character. A
backslash itself in the string which forms part of a larger syntax is
always transmitted as '\5C' or '\5c'.
For the purposes of defining the encoding rules for attribute syntaxes,
the following auxiliary BNF definitions will be used:
<a> ::= 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' |
'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' |
's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z' | 'A' |
'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' | 'J' |
'K' | 'L' | 'M' | 'N' | 'O' | 'P' | 'Q' | 'R' | 'S' |
'T' | 'U' | 'V' | 'W' | 'X' | 'Y' | 'Z'
<d> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
<hex-digit> ::= <d> | 'a' | 'b' | 'c' | 'd' | 'e' | 'f' |
'A' | 'B' | 'C' | 'D' | 'E' | 'F'
<k> ::= <a> | <d> | '-'
<p> ::= <a> | <d> | ''' | '(' | ')' | '+' | ',' | '-' | '.' |
'/' | ':' | '?' | ' '
<letterstring> ::= <a> | <a> <letterstring>
<numericstring> ::= <d> | <d> <numericstring>
<keystring> ::= <a> | <a> <anhstring>
<anhstring> ::= <k> | <k> <anhstring>
<printablestring> ::= <p> | <p> <printablestring>
<space> ::= ' ' | ' ' <space>
<whsp> ::= <space> | empty
Wahl, Coulbeck, Howes, Kille Page 3
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<utf8> ::= any sequence of octets formed from the UTF-8 [9]
transformation of a character from ISO 10646 [10]
<dstring> ::= <utf8> | <utf8> <dstring>
<DirectoryStrings> ::= <DirectoryString> | '(' <DirectoryStringList> ')'
<DirectoryStringList> ::= <DirectoryStringList> <DirectoryString> | ""
<DirectoryString> ::= ''' <dstring> '''
<oids> ::= <oid> | '(' <oidlist> ')'
<oidlist> ::= <oidlist> '$' <oid> | <oid>
4.2.2 Binary Transfer of Values
This encoding format is used if the binary encoding is requested by the
client for an attribute, or if the attribute syntax name is 'Binary'. The
value, an instance of the ASN.1 AttributeValue type, is BER-encoded,
subject to the restrictions of section 5.1 of [1], and this sequence of
octets is used as the value.
All servers MUST implement this form for both generating attribute values in
search responses, and parsing attribute values in add, compare and modify
requests, if the attribute type is recognized and the attribute syntax name
is 'Binary'. Clients MUST be prepared receiving values in binary (e.g.
userCertificate or audio), and MUST NOT simply display binary or
unrecognized values to users.
4.2.3. Syntax Names
Names of syntaxes for use with LDAP are ASCII strings which either
begin with a letter and contain only letters or digits. The names are
case insensitive. Historically since syntaxes correspond to ASN.1 types,
they have been named starting with a capital letter. A suggested minimum
upper bound on the number of characters in value with a DirectoryString or
IA5String syntax or the number of bytes in a value for all other syntaxes
may be indicated by appending this bound count inside of curly braces.
For instance, "DirectoryString{64}" suggests that server implementations
should allow the string to be 64 characters long, althoough they may allow
longer strings. Note that a single character of the DirectoryString may be
encoded in more than one byte since UTF-8 is a variable-length encoding.
Syntax names do not have global scope: two clients or servers may
know of different syntaxes with the same name.
The definition of additional arbitrary syntaxes is strongly depreciated
since it will hinder interoperability: today's client and server
implementations generally do not have the ability to dynamically recognize
new syntaxes. In most cases attributes will be defined with the
DirectoryString syntax.
Wahl, Coulbeck, Howes, Kille Page 4
INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
4.3. Object Classes
Object class descriptions are written according to the following BNF:
<ObjectClassDescription> ::= "("
<oid> -- ObjectClass identifier
[ "NAME" <DirectoryStrings> ]
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
[ "SUP" <oids> ] -- Superior ObjectClasses
[ ( "ABSTRACT" | "STRUCTURAL" | "AUXILIARY" ) ] -- default structural
[ "MUST" <oids> ] -- AttributeTypes
[ "MAY" <oids> ] -- AttributeTypes
")"
These are described as sample values for the subschema "objectClasses"
attribute for a server which implements the LDAP schema.
While lines have been folded for readability, the values transferred in
protocol would not contain newlines.
Servers SHOULD implement all the object classes referenced in section 7,
except for extensibleObject, which is optional.
Servers MAY implement additional object classes not listed in this
document, and if they do so, SHOULD publish the definitions of the classes
in the objectClasses attribute of their subschema subentries. Later
documents may define additional object classes.
4.4. Matching Rules
Matching rules are used by servers to compare attribute values against
assertion values when performing Search and Compare operations.
Most of the attributes given in this document will have an equality
matching rule defined.
Matching rule descriptions are written according to the following BNF:
<MatchingRuleDescription> ::= "("
<oid> -- MatchingRule identifier
[ "NAME" <DirectoryStrings> ]
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
"SYNTAX" <DirectoryString>
")"
Servers SHOULD implement all the matching rules in section 8.
Servers MAY implement additional matching rules not listed in this
document, and if they do so, SHOULD publish the definitions of the
matching rules in the matchingRules attribute of their
subschema subentries.
Wahl, Coulbeck, Howes, Kille Page 5
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5. Attribute Types
All LDAP server implementations MUST recognize the attribute types
defined in this section. These types are based on definitions in
X.501(93) [3].
Servers SHOULD also recognize all the attributes from section 5 of [12],
from section 5 of [13].
5.1. Standard Operational Attributes
5.1.1. createTimestamp
( 2.5.18.1 NAME 'createTimestamp' EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch SYNTAX 'GeneralizedTime'
SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )
5.1.2. modifyTimestamp
( 2.5.18.2 NAME 'modifyTimestamp' EQUALITY generalizedTimeMatch
ORDERING generalizedTimeOrderingMatch SYNTAX 'GeneralizedTime'
SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )
5.1.3. creatorsName
( 2.5.18.3 NAME 'creatorsName' EQUALITY distinguishedNameMatch SYNTAX 'DN'
SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )
5.1.4. modifiersName
( 2.5.18.4 NAME 'modifiersName' EQUALITY distinguishedNameMatch SYNTAX 'DN'
SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )
5.1.5. subschemaSubentry
The value of this attribute is the name of a subschema subentry, an
entry in which the server makes available attributes specifying
the schema.
( 2.5.18.10 NAME 'subschemaSubentry'
EQUALITY distinguishedNameMatch SYNTAX 'DN' NO-USER-MODIFICATION
SINGLE-VALUE USAGE directoryOperation )
5.1.6. attributeTypes
( 2.5.21.5 NAME 'attributeTypes'
EQUALITY objectIdentifierFirstComponentMatch
SYNTAX 'AttributeTypeDescription' USAGE directoryOperation )
5.1.7. objectClasses
( 2.5.21.6 NAME 'objectClasses'
EQUALITY objectIdentifierFirstComponentMatch
SYNTAX 'ObjectClassDescription' USAGE directoryOperation )
Wahl, Coulbeck, Howes, Kille Page 6
INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
5.2. LDAP Operational Attributes
These attributes are only present in the root DSE.
Servers MUST recognize these attribute names, but it is not required that
a server provide values for these attributes, when the attribute
corresponds to a feature which the server does not implement.
5.2.1. namingContexts
The values of this attribute correspond to naming contexts which this
server masters or shadows. If the server does not master any
information (e.g. it is an LDAP gateway to a public X.500 directory)
this attribute will be absent. If the server believes it contains the
entire directory, the attribute will have a single value, and that
value will be the empty string (indicating the null DN of the root).
This attribute will allow a client to choose suitable base objects
for searching when it has contacted a server.
( 1.3.6.1.4.1.1466.101.120.5 NAME 'namingContexts'
SYNTAX 'DN' USAGE dSAOperation )
5.2.2. altServer
The values of this attribute are URLs of other servers which may be
contacted when this server becomes unavailable. If the server does not
know of any other servers which could be used this attribute will be
absent. Clients may cache this information in case their preferred LDAP
server later becomes unavailable.
( 1.3.6.1.4.1.1466.101.120.6 NAME 'altServer'
SYNTAX 'IA5String' USAGE dSAOperation )
5.2.3. supportedExtension
The values of this attribute are OBJECT IDENTIFIERs identifying the
supported extended operations which the server supports.
If the server does not support any extensions this attribute will be
absent.
( 1.3.6.1.4.1.1466.101.120.7 NAME 'supportedExtension'
SYNTAX 'OID' USAGE dSAOperation )
5.2.4. supportedControl
The values of this attribute are the OBJECT IDENTIFIERS identifying
controls which the server supports. If the server does not
support any controls, this attribute will be absent.
( 1.3.6.1.4.1.1466.101.120.13 NAME 'supportedControl'
SYNTAX 'OID' USAGE dSAOperation )
Wahl, Coulbeck, Howes, Kille Page 7
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5.2.5. supportedSASLMechanisms
The values of this attribute are the names of supported SASL
mechanisms which the server supports. If the server does not
support any mechanisms this attribute will be absent.
( 1.3.6.1.4.1.1466.101.120.14 NAME 'supportedSASLMechanisms'
SYNTAX 'LDAPString' USAGE dSAOperation )
5.2.6. supportedLDAPVersion
The values of this attribute are the versions of the LDAP protocol which
the server implements.
( 1.3.6.1.4.1.1466.101.120.15 NAME 'supportedLDAPVersion'
SYNTAX 'INTEGER' USAGE dSAOperation )
6. Syntaxes
Servers SHOULD recognize all the syntaxes described in this section
(6.1 - 6.3).
6.1. AttributeTypeDescription
Values with this syntax are encoded according to the BNF given at the
start of section 4.1. For example,
( 2.5.4.0 NAME 'objectClass' SYNTAX 'OID' )
6.2. Audio
The encoding of a value with Audio syntax is the octets of the value
itself, an 8KHz uncompressed encoding compatible with the SunOS
4.1.3 'play' utility.
6.3. BitString
The encoding of a value with BitString syntax is according to the
following BNF:
<bitstring> ::= ''' <binary-digits> ''B'
<binary-digits> ::= '0' <binary-digits> | '1' <binary-digits> |
empty
Example:
'0101111101'B
Wahl, Coulbeck, Howes, Kille Page 8
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6.4. Boolean
Values with Boolean syntax are encoded according to the following
BNF:
<boolean> ::= "TRUE" | "FALSE"
Boolean values have an encoding of "TRUE" if they are logically true,
and have an encoding of "FALSE" otherwise.
6.5. Certificate
Because of the changes from X.509(1988) and X.509(1993) and additional
changes to the ASN.1 definition to support certificate extensions, no
string representation is defined, and values with Certificate syntax
MUST only be transferred using the binary encoding, by requesting or
returning the attributes with descriptions "userCertificate;binary" or
"caCertificate;binary". The BNF notation in RFC 1778 for
"User Certificate" is not recommended to be used.
6.6. CertificateList
Because of the incompatibility of the X.509(1988) and X.509(1993)
definitions of revocation lists, values with CertificateList syntax
MUST only be transferred using a binary encoding, by requesting or
returning the attributes with descriptions
"certificateRevocationList;binary" or "authorityRevocationList;binary".
The BNF notation in RFC 1778 for "Authority Revocation List" is not
recommended to be used.
6.7. CertificatePair
Because the Certificate is being carried in binary, values with
CertificatePair syntax MUST only be transferred using a binary encoding,
by requesting or returning the attribute description
"crossCertificatePair;binary". The BNF notation in RFC 1778 for
"Certificate Pair" is not recommended to be used.
6.8. CountryString
A value of CountryString syntax is encoded the same as a value of
DirectoryString syntax. Note that this syntax is limited to values of
exactly two printable string characters.
<CountryString> ::= <p> <p>
Example:
US
Wahl, Coulbeck, Howes, Kille Page 9
INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
6.9. DN
Values with DN (Distinguished Name) syntax are encoded to have the
representation defined in [5]. Note that this representation is not
reversible to an ASN.1 encoding used in X.500 for Distinguished Names, as
the CHOICE of any DirectoryString element in an RDN is no longer known.
Examples (from [5]):
CN=Steve Kille,O=Isode Limited,C=GB
OU=Sales+CN=J. Smith,O=Widget Inc.,C=US
CN=L. Eagle,O=Sue\, Grabbit and Runn,C=GB
CN=Before\0DAfter,O=Test,C=GB
1.3.6.1.4.1.1466.0=#04024869,O=Test,C=GB
SN=Lu\C4\8Di\C4\C7
6.10. DirectoryString
A string with DirectoryString syntax is encoded in the UTF-8 form of
ISO 10646 (a superset of Unicode). Servers and clients MUST be prepared to
receive encodings of arbitrary Unicode characters, including characters
not presently assigned to any character set, in values.
For characters in the PrintableString form, the value is encoded as the
string value itself.
If it is of the TeletexString form, then the characters are transliterated
to their equivalents in UniversalString, and encoded in UTF-8 [9].
If it is of the UniversalString or BMPString forms [10], UTF-8 is used to
encode them.
Note: the form of DirectoryString is not indicated in protocol unless the
attribute value is carried in binary. Servers which convert to DAP MUST
choose an appropriate form. Servers MUST NOT reject values merely because
they contain legal Unicode characters outside of the range of printable
ASCII.
Example:
This is a string of DirectoryString containing #!%#@
6.11. DITContentRuleDescription
Values with this syntax are encoded according to the following BNF:
<DITContentRuleDescription> ::= "("
<oid> -- Structural ObjectClass identifier
[ "NAME" <DirectoryStrings> ]
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
[ "AUX" <oids> ] -- Auxiliary ObjectClasses
[ "MUST" <oids> ] -- AttributeType identifiers
[ "MAY" <oids> ] -- AttributeType identifiers
[ "NOT" <oids> ] -- AttributeType identifiers
")"
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6.12. FacsimileTelephoneNumber
Values with the FacsimileTelephoneNumber syntax are encoded according
to the following BNF:
<fax-number> ::= <printablestring> [ '$' <faxparameters> ]
<faxparameters> ::= <faxparm> | <faxparm> '$' <faxparameters>
<faxparm> ::= 'twoDimensional' | 'fineResolution' | 'unlimitedLength' |
'b4Length' | 'a3Width' | 'b4Width' | 'uncompressed'
In the above, the first <printablestring> is the actual fax number,
and the <faxparm> tokens represent fax parameters.
6.13. Fax
Values with Fax syntax are encoded as if they were octet strings
containing Group 3 Fax images as defined in [7].
6.14. GeneralizedTime
Values of this syntax are encoded as printable strings, represented
as specified in X.208. Note that the time zone must be specified.
It is strongly recommended that Zulu time zone be used. For example,
199412161032Z
6.15. IA5String
The encoding of a value with IA5String syntax is the string value
itself.
6.16. INTEGER
Values with INTEGER syntax are encoded as the decimal representation
of their values, with each decimal digit represented by the its
character equivalent. So the number 1321 is represented by the character
string "1321".
6.17. JPEG
Values with JPEG syntax are encoded as if they were octet strings
containing JPEG images in the JPEG File Interchange Format (JFIF), as
described in [8].
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INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
6.18. MatchingRuleUseDescription
Values of this syntax are encoded according to the following BNF:
<MatchingRuleUseDescription> ::= "("
<oid> -- MatchingRule identifier
[ "NAME" <DirectoryStrings> ]
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
"APPLIES" <oids> -- AttributeType identifiers
")"
6.19. MHSORAddress
Values of type MHSORAddress are encoded as strings, according to
the format defined in [11].
6.20. NameAndOptionalUID
The encoding of a value with the NameAndOptionalUID syntax is according
to the following BNF:
<NameAndOptionalUID> ::=
<DistinguishedName> [ '#' <bitstring> ]
Although the '#' character may occur in a string representation of a
distinguished name, no additional special quoting is done.
This syntax has been added subsequent to RFC 1778.
Example:
1.3.6.1.4.1.1466.0=#04024869,O=Test,C=GB#'0101'B
6.21. NameFormDescription
Values of this syntax are encoded according to the following BNF:
<NameFormDescription> ::= "("
<oid> -- NameForm identifier
[ "NAME" <DirectoryStrings> ]
[ "DESC" <DirectoryString> ]
[ "OBSOLETE" ]
"OC" <oid> -- Structural ObjectClass
"MUST" <oids> -- AttributeTypes
[ "MAY" <oids> ] -- AttributeTypes
")"
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INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
6.22. NumericString
The encoding of a string with the NumericString syntax is the string
value itself. Example:
1997
6.23. ObjectClassDescription
Values of this syntax are encoded according to the BNF in section 4.3.
6.24. OID
Values with OID (Object Identifier) syntax are encoded according to the
following BNF:
<oid> ::= <descr> | <numericoid>
<descr> ::= <keystring>
<numericoid> ::= <numericstring> | <numericstring> '.' <numericoid>
In the above BNF, <descr> is the syntactic representation of an
object descriptor, which consists of letters and digits, starting
with a letter. When encoding values with OID syntax, the first encoding
option MUST be used in preference to the second. That is, in encoding
object identifiers, object descriptors (where assigned and known by
the implementation) must be used in preference to numeric oids to
the greatest extent possible. All permitted object descriptors for use
in LDAP are given in this document. No other object descriptors may be
used. (Note that clients should expect that LDAPv2 implementations
will return object descriptors other than those listed.)
Example:
1.2.3.4
cn
6.25. OtherMailbox
Values of the OtherMailbox syntax are encoded according to the
following BNF:
<otherMailbox> ::= <mailbox-type> '$' <mailbox>
<mailbox-type> ::= an encoded Printable String
<mailbox> ::= an encoded IA5 String
In the above, <mailbox-type> represents the type of mail system in
which the mailbox resides, for example "MCIMail"; and <mailbox> is the
actual mailbox in the mail system defined by <mailbox-type>.
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6.26. Password
Values with Password syntax are encoded as octet strings.
Example:
secret
6.27. PostalAddress
Values with the PostalAddress syntax are encoded according to the
following BNF:
<postal-address> ::= <dstring> | <dstring> '$' <postal-address>
In the above, each <dstring> component of a postal address value is
encoded as a value of type DirectoryString syntax. Backslashes and
dollar characters, if they occur in the component, are quoted as
described in section 4.2.
Example:
1234 Main St.$Anytown, CA 12345$USA
\241,000,000 Sweepstakes$PO Box 1000000$Anytown, CA 12345$USA
6.28. PresentationAddress
Values with the PresentationAddress syntax are encoded to have the
representation described in [6].
6.29. PrintableString
The encoding of a value with PrintableString syntax is the string
value itself. PrintableString is limited to the characters in
production <p> of section 4.1.
Example:
This is a PrintableString
6.30. TelephoneNumber
Values with the TelephoneNumber syntax are encoded as if they were
Printable String types. Telephone numbers are recommended in X.520 to
be in international form.
Example:
+1 512 305 0280
6.31. UTCTime
Values with UTCTime syntax are encoded as if they were printable
strings with the strings containing a UTCTime value. This is historical;
new attribute definitions will use GeneralizedTime instead.
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7. Object Classes
Servers SHOULD recognize all the names of standard classes from section
7 of [12], as well as the names of the Internet classes from section
7 of [13].
7.1. Extensible Object Class
The extensibleObject object class, if present in an entry, permits that
entry to optionally hold any attribute. The MAY attribute list of this
class is implicitly the set of all attributes known to the server.
( 1.3.6.1.4.1.1466.101.120.111 NAME 'extensibleObject'
SUP top AUXILIARY )
The mandatory attributes of the other object classes of this entry are
still required to be present.
Note that not all servers will implement this object class, and those
which do not will reject requests to add entries which contain this
object class, or modify an entry to add this object class.
8. Matching Rules
Servers which implement extensibleMatch SHOULD recognize the following
matching rules, used for equality matching, and be capable of
performing the matching rules. For all these rules, the
assertion syntax is the same as the value syntax.
( 2.5.13.0 NAME 'objectIdentifierMatch' SYNTAX 'OID' )
( 2.5.13.1 NAME 'distinguishedNameMatch' SYNTAX 'DN' )
( 2.5.13.2 NAME 'caseIgnoreMatch' SYNTAX 'DirectoryString' )
( 2.5.13.8 NAME 'numericStringMatch' SYNTAX 'NumericString' )
( 2.5.13.11 NAME 'caseIgnoreListMatch' SYNTAX 'PostalAddress' )
( 2.5.13.14 NAME 'integerMatch' SYNTAX 'INTEGER' )
( 2.5.13.16 NAME 'bitStringMatch' SYNTAX 'BitString' )
( 2.5.13.17 NAME 'octetStringMatch' SYNTAX 'Password' )
( 2.5.13.20 NAME 'telephoneNumberMatch' SYNTAX 'TelephoneNumber' )
( 2.5.13.22 NAME 'presentationAddressMatch' SYNTAX 'PresentationAddress' )
( 2.5.13.23 NAME 'uniqueMemberMatch' SYNTAX 'NameAndOptionalUID' )
( 2.5.13.24 NAME 'protocolInformationMatch' SYNTAX 'ProtocolInformation' )
( 2.5.13.27 NAME 'generalizedTimeMatch' SYNTAX 'GeneralizedTime' )
( 1.3.6.1.4.1.1466.109.114.1 NAME 'caseExactIA5Match' SYNTAX 'IA5String' )
( 1.3.6.1.4.1.1466.109.114.2 NAME 'caseIgnoreIA5Match' SYNTAX 'IA5String' )
When performing the caseIgnoreMatch, caseIgnoreListMatch,
telephoneNumberMatch, caseExactIA5Match and caseIgnoreIA5Match,
multiple adjoining whitespace characters are treated the same as an
individual space, and leading and trailing whitespace is ignored.
9. Security Considerations
Security issues are not discussed in this memo.
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10. Acknowledgements
This document is based substantially on RFC 1778, written by Tim Howes,
Steve Kille, Wengyik Yeong and Colin Robbins.
Many of the attribute syntax encodings defined in this document are
adapted from those used in the QUIPU and the IC R3 X.500
implementations. The contributions of the authors of both these
implementations in the specification of syntaxes in this document are
gratefully acknowledged.
11. Authors Addresses
Mark Wahl
Critical Angle Inc.
4815 West Braker Lane #502-385
Austin, TX 78759
USA
EMail: M.Wahl@critical-angle.com
Andy Coulbeck
Isode Limited
The Dome, The Square
Richmond TW9 1DT
United Kingdom
Phone: +44 181-332-9091
EMail: A.Coulbeck@isode.com
Tim Howes
Netscape Communications Corp.
501 E. Middlefield Rd
Mountain View, CA 94043
USA
Phone: +1 415 254-1900
EMail: howes@netscape.com
Steve Kille
Isode Limited
The Dome, The Square
Richmond
TW9 1DT
UK
Phone: +44-181-332-9091
EMail: S.Kille@isode.com
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INTERNET-DRAFT LDAPv3 Attribute Syntax Definitions March 1997
12. Bibliography
[1] M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access Protocol
(Version 3)", INTERNET-DRAFT <draft-ietf-asid-ldapv3-protocol-04.txt>,
March 1997.
[2] The Directory: Selected Attribute Types. ITU-T Recommendation
X.520, 1993.
[3] The Directory: Models. ITU-T Recommendation X.501, 1993.
[4] S. Bradner, "Key words for use in RFCs to Indicate Requirement
Levels", INTERNET-DRAFT <draft-bradner-key-words-03.txt>.
[5] M. Wahl, S. Kille, "A UTF-8 String Representation of Distinguished
Names", INTERNET-DRAFT <draft-ietf-asid-ldapv3-dn-02.txt>,
March 1997.
[6] S. Kille, "A String Representation for Presentation Addresses",
RFC 1278, University College London, November 1991.
[7] Terminal Equipment and Protocols for Telematic Services -
Standardization of Group 3 facsimile apparatus for document
transmission. CCITT, Recommendation T.4.
[8] JPEG File Interchange Format (Version 1.02). Eric Hamilton,
C-Cube Microsystems, Milpitas, CA, September 1, 1992.
[9] F. Yergeau, "UTF-8, a transformation format of Unicode and ISO
10646", RFC 2044, October 1996.
[10] Universal Multiple-Octet Coded Character Set (UCS) - Architecture
and Basic Multilingual Plane, ISO/IEC 10646-1 : 1993.
[11] H. Alvestrand, S. Kille, R. Miles, M. Rose, S. Thompson,
"Mapping between X.400 and RFC-822 Message Bodies", RFC 1495,
August 1993.
[12] M. Wahl, "X.500(93) User Schema for use with LDAP",
INTERNET-DRAFT <draft-ietf-asid-ldapv3schema-x500-00.txt>,
March 1997.
[13] M. Wahl, "Pilot Internet Schema for use with LDAP",
INTERNET-DRAFT <draft-ietf-asid-ldapv3schema-pilot-00.txt>,
March 1997.
<draft-ietf-asid-ldapv3-attributes-04.txt>
Expires: September 1997
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