draft-ietf-ldapbis-protocol-11.txt   draft-ietf-ldapbis-protocol-12.txt 
Internet-Draft Editor: J. Sermersheim Internet-Draft Editor: J. Sermersheim
Intended Category: Standard Track Novell, Inc Intended Category: Standard Track Novell, Inc
Document: draft-ietf-ldapbis-protocol-11.txt Nov 2002 Document: draft-ietf-ldapbis-protocol-12.txt Dec 2002
Obsoletes: RFC 2251 Obsoletes: RFC 2251
LDAP: The Protocol LDAP: The Protocol
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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Directory Access Protocol (DAP). Directory Access Protocol (DAP).
Table of Contents Table of Contents
1. Introduction.....................................................2 1. Introduction.....................................................2
2. Conventions......................................................3 2. Conventions......................................................3
3. Protocol Model...................................................3 3. Protocol Model...................................................3
4. Elements of Protocol.............................................3 4. Elements of Protocol.............................................3
4.1. Common Elements................................................4 4.1. Common Elements................................................4
4.1.1. Message Envelope.............................................4 4.1.1. Message Envelope.............................................4
4.1.2. String Types.................................................5 4.1.2. String Types.................................................6
4.1.3. Distinguished Name and Relative Distinguished Name...........6 4.1.3. Distinguished Name and Relative Distinguished Name...........6
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4.1.4. Attribute Descriptions.......................................6 4.1.4. Attribute Descriptions.......................................6
4.1.5. Attribute Value..............................................7 4.1.5. Attribute Value..............................................7
4.1.6. Attribute Value Assertion....................................7 4.1.6. Attribute Value Assertion....................................7
4.1.7. Attribute....................................................7 4.1.7. Attribute....................................................7
4.1.8. Matching Rule Identifier.....................................8 4.1.8. Matching Rule Identifier.....................................8
4.1.9. Result Message...............................................8 4.1.9. Result Message...............................................8
4.1.10. Referral...................................................10 4.1.10. Referral...................................................10
4.1.11. Controls...................................................11 4.1.11. Controls...................................................11
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5. Protocol Element Encodings and Transfer.........................31 5. Protocol Element Encodings and Transfer.........................31
5.1. Protocol Encoding.............................................31 5.1. Protocol Encoding.............................................31
5.2. Transfer Protocols............................................32 5.2. Transfer Protocols............................................32
6. Implementation Guidelines.......................................32 6. Implementation Guidelines.......................................32
6.1. Server Implementations........................................32 6.1. Server Implementations........................................32
6.2. Client Implementations........................................32 6.2. Client Implementations........................................32
7. Security Considerations.........................................33 7. Security Considerations.........................................33
8. Acknowledgements................................................33 8. Acknowledgements................................................33
9. Normative References............................................33 9. Normative References............................................33
10. Editor's Address...............................................34 10. Editor's Address...............................................34
Appendix A - LDAP Result Codes.....................................35 Appendix A - LDAP Result Codes.....................................36
A.1 Non-Error Result Codes.........................................35 A.1 Non-Error Result Codes.........................................36
A.2 Error Result Codes.............................................35 A.2 Error Result Codes.............................................36
A.3 Classes and Precedence of Error Result Codes...................35 A.3 Classes and Precedence of Error Result Codes...................36
Appendix C - Change History........................................46 Appendix C - Change History........................................47
C.1 Changes made to RFC 2251:......................................46 C.1 Changes made to RFC 2251:......................................47
C.2 Changes made to draft-ietf-ldapbis-protocol-00.txt:............46 C.2 Changes made to draft-ietf-ldapbis-protocol-00.txt:............47
C.3 Changes made to draft-ietf-ldapbis-protocol-01.txt:............47 C.3 Changes made to draft-ietf-ldapbis-protocol-01.txt:............48
C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt:............47 C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt:............48
C.5 Changes made to draft-ietf-ldapbis-protocol-03.txt:............49 C.5 Changes made to draft-ietf-ldapbis-protocol-03.txt:............50
C.6 Changes made to draft-ietf-ldapbis-protocol-04.txt:............51 C.6 Changes made to draft-ietf-ldapbis-protocol-04.txt:............52
C.7 Changes made to draft-ietf-ldapbis-protocol-05.txt:............51 C.7 Changes made to draft-ietf-ldapbis-protocol-05.txt:............52
C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt:............52 C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt:............53
C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt:............55 C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt:............56
C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt:...........55 C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt:...........56
C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt:...........55 C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt:...........56
C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt:...........55 C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt:...........56
Appendix D - Outstanding Work Items................................56 C.13 Changes made to draft-ietf-ldapbis-protocol-11.txt:...........57
Appendix D - Outstanding Work Items................................57
1. Introduction 1. Introduction
The Directory is "a collection of open systems cooperating to provide Sermersheim Internet-Draft - Expires Jun 2003 Page 2
directory services" [X.500]. A Directory user, which may be a human
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The Directory is "a collection of open systems cooperating to provide
directory services" [X.500]. A Directory user, which may be a human
or other entity, accesses the Directory through a client (or or other entity, accesses the Directory through a client (or
Directory User Agent (DUA)). The client, on behalf of the directory Directory User Agent (DUA)). The client, on behalf of the directory
user, interacts with one or more servers (or Directory System Agents user, interacts with one or more servers (or Directory System Agents
(DSA)). Clients interact with servers using a directory access (DSA)). Clients interact with servers using a directory access
protocol. protocol.
This document details the protocol elements of Lightweight Directory This document details the protocol elements of Lightweight Directory
Access Protocol, along with their semantic meanings. Following the Access Protocol, along with their semantic meanings. Following the
description of protocol elements, it describes the way in which the description of protocol elements, it describes the way in which the
protocol is encoded and transferred. protocol is encoded and transferred.
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This document is an integral part of the LDAP Technical Specification This document is an integral part of the LDAP Technical Specification
[Roadmap]. [Roadmap].
This document replaces RFC 2251. Appendix C holds a detailed log of This document replaces RFC 2251. Appendix C holds a detailed log of
changes to RFC 2251. At publication time, this appendix will be changes to RFC 2251. At publication time, this appendix will be
distilled to a summary of changes to RFC 2251. distilled to a summary of changes to RFC 2251.
2. Conventions 2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", and "MAY" in this document "SHOULD", "SHOULD NOT", "RECOMMENDED", and "MAY" in this document are
are to be interpreted as described in [RFC2119]. to be interpreted as described in [RFC2119].
3. Protocol Model 3. Protocol Model
The general model adopted by this protocol is one of clients The general model adopted by this protocol is one of clients
performing protocol operations against servers. In this model, a performing protocol operations against servers. In this model, a
client transmits a protocol request describing the operation to be client transmits a protocol request describing the operation to be
performed to a server. The server is then responsible for performing performed to a server. The server is then responsible for performing
the necessary operation(s) in the directory. Upon completion of the the necessary operation(s) in the directory. Upon completion of the
operation(s), the server returns a response containing any results or operation(s), the server returns a response containing any results or
errors to the requesting client. errors to the requesting client.
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eventually receives a response for every request that requires one. eventually receives a response for every request that requires one.
Note that the core protocol operations defined in this document can Note that the core protocol operations defined in this document can
be mapped to a subset of the X.500(1997) directory abstract service. be mapped to a subset of the X.500(1997) directory abstract service.
However there is not a one-to-one mapping between LDAP protocol However there is not a one-to-one mapping between LDAP protocol
operations and DAP operations. Server implementations acting as a operations and DAP operations. Server implementations acting as a
gateway to X.500 directories may need to make multiple DAP requests. gateway to X.500 directories may need to make multiple DAP requests.
4. Elements of Protocol 4. Elements of Protocol
The LDAP protocol is described using Abstract Syntax Notation 1 Sermersheim Internet-Draft - Expires Jun 2003 Page 3
(ASN.1) [X.680], and is transferred using a subset of ASN.1 Basic
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The LDAP protocol is described using Abstract Syntax Notation 1
(ASN.1) [X.680], and is transferred using a subset of ASN.1 Basic
Encoding Rules [X.690]. Section 5.1 specifies how the protocol is Encoding Rules [X.690]. Section 5.1 specifies how the protocol is
encoded and transferred. encoded and transferred.
In order to support future Standards Track extensions to this In order to support future Standards Track extensions to this
protocol, extensibility is implied where it is allowed (per ASN.1). protocol, extensibility is implied where it is allowed (per ASN.1).
In addition, ellipses (...) have been supplied in ASN.1 types that In addition, ellipses (...) have been supplied in ASN.1 types that
are explicitly extensible as discussed in [LDAPIANA]. Because of the are explicitly extensible as discussed in [LDAPIANA]. Because of the
implied extensibility, clients and servers MUST ignore trailing implied extensibility, clients and servers MUST ignore trailing
SEQUENCE elements whose tags they do not recognize. SEQUENCE elements whose tags they do not recognize.
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searchResEntry SearchResultEntry, searchResEntry SearchResultEntry,
searchResDone SearchResultDone, searchResDone SearchResultDone,
searchResRef SearchResultReference, searchResRef SearchResultReference,
modifyRequest ModifyRequest, modifyRequest ModifyRequest,
modifyResponse ModifyResponse, modifyResponse ModifyResponse,
addRequest AddRequest, addRequest AddRequest,
addResponse AddResponse, addResponse AddResponse,
delRequest DelRequest, delRequest DelRequest,
delResponse DelResponse, delResponse DelResponse,
modDNRequest ModifyDNRequest, modDNRequest ModifyDNRequest,
modDNResponse ModifyDNResponse,
compareRequest CompareRequest,
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modDNResponse ModifyDNResponse,
compareRequest CompareRequest,
compareResponse CompareResponse, compareResponse CompareResponse,
abandonRequest AbandonRequest, abandonRequest AbandonRequest,
extendedReq ExtendedRequest, extendedReq ExtendedRequest,
extendedResp ExtendedResponse, extendedResp ExtendedResponse,
... }, ... },
controls [0] Controls OPTIONAL } controls [0] Controls OPTIONAL }
MessageID ::= INTEGER (0 .. maxInt) MessageID ::= INTEGER (0 .. maxInt)
maxInt INTEGER ::= 2147483647 -- (2^^31 - 1) -- maxInt INTEGER ::= 2147483647 -- (2^^31 - 1) --
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which this message is a part. The zero value is reserved for the which this message is a part. The zero value is reserved for the
unsolicited notification message. unsolicited notification message.
Typical clients increment a counter for each request. Typical clients increment a counter for each request.
A client MUST NOT send a request with the same message ID as an A client MUST NOT send a request with the same message ID as an
earlier request on the same connection unless it can be determined earlier request on the same connection unless it can be determined
that the server is no longer servicing the earlier request. Otherwise that the server is no longer servicing the earlier request. Otherwise
the behavior is undefined. For operations that do not return the behavior is undefined. For operations that do not return
responses (unbind, abandon, and abandoned operations), the client responses (unbind, abandon, and abandoned operations), the client
SHOULD assumes the operation is in progress until a subsequent bind SHOULD assume the operation is in progress until a subsequent bind
request completes. request completes.
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4.1.2. String Types
The LDAPString is a notational convenience to indicate that, although The LDAPString is a notational convenience to indicate that, although
strings of LDAPString type encode as OCTET STRING types, the strings of LDAPString type encode as OCTET STRING types, the
[ISO10646] character set (a superset of Unicode) is used, encoded [ISO10646] character set (a superset of Unicode) is used, encoded
following the UTF-8 algorithm [RFC2044]. Note that in the UTF-8 following the UTF-8 algorithm [RFC2279]. Note that in the UTF-8
algorithm characters which are the same as ASCII (0x0000 through algorithm characters which are the same as ASCII (0x0000 through
0x007F) are represented as that same ASCII character in a single 0x007F) are represented as that same ASCII character in a single
byte. The other byte values are used to form a variable-length byte. The other byte values are used to form a variable-length
encoding of an arbitrary character. encoding of an arbitrary character.
LDAPString ::= OCTET STRING -- UTF-8 encoded, LDAPString ::= OCTET STRING -- UTF-8 encoded,
-- ISO 10646 characters -- ISO 10646 characters
The LDAPOID is a notational convenience to indicate that the The LDAPOID is a notational convenience to indicate that the
permitted value of this string is a (UTF-8 encoded) dotted-decimal permitted value of this string is a (UTF-8 encoded) dotted-decimal
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is an attribute type and zero or more options. is an attribute type and zero or more options.
AttributeDescription ::= LDAPString AttributeDescription ::= LDAPString
-- Constrained to attributedescription -- Constrained to attributedescription
-- [Models] -- [Models]
An AttributeDescriptionList describes a list of 0 or more attribute An AttributeDescriptionList describes a list of 0 or more attribute
descriptions. (A list of zero elements has special significance in descriptions. (A list of zero elements has special significance in
the Search request.) the Search request.)
AttributeDescriptionList ::= SEQUENCE OF Sermersheim Internet-Draft - Expires Jun 2003 Page 6
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AttributeDescriptionList ::= SEQUENCE OF
AttributeDescription AttributeDescription
4.1.5. Attribute Value 4.1.5. Attribute Value
A field of type AttributeValue is an OCTET STRING containing an A field of type AttributeValue is an OCTET STRING containing an
encoded attribute value data type. The value is encoded according to encoded attribute value data type. The value is encoded according to
its LDAP-specific encoding definition. The LDAP-specific encoding its LDAP-specific encoding definition. The LDAP-specific encoding
definitions for different syntaxes and attribute types may be found definitions for different syntaxes and attribute types may be found
in other documents, and in particular [Syntaxes]. in other documents, and in particular [Syntaxes].
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matching rule for an attribute is used when performing a Compare matching rule for an attribute is used when performing a Compare
operation. Often this is the same syntax used for values of the operation. Often this is the same syntax used for values of the
attribute type, but in some cases the assertion syntax differs from attribute type, but in some cases the assertion syntax differs from
the value syntax. See objectIdentiferFirstComponentMatch in the value syntax. See objectIdentiferFirstComponentMatch in
[Syntaxes] for an example. [Syntaxes] for an example.
4.1.7. Attribute 4.1.7. Attribute
An attribute consists of an attribute description and one or more An attribute consists of an attribute description and one or more
values of that attribute description. (Though attributes MUST have at values of that attribute description. (Though attributes MUST have at
least one value when stored, due to access control restrictions the
set may be empty when transferred from the server to the client. This
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least one value when stored, due to access control restrictions the
set may be empty when transferred from the server to the client. This
is described in section 4.5.2, concerning the PartialAttributeList is described in section 4.5.2, concerning the PartialAttributeList
type.) type.)
Attribute ::= SEQUENCE { Attribute ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
vals SET OF AttributeValue } vals SET OF AttributeValue }
Each attribute value is distinct in the set (no duplicates). The set Each attribute value is distinct in the set (no duplicates). The set
of attribute values is unordered. Implementations MUST NOT reply upon of attribute values is unordered. Implementations MUST NOT reply upon
any apparent ordering being repeatable. any apparent ordering being repeatable.
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subschema entries, using the matchingRules attributes. The server subschema entries, using the matchingRules attributes. The server
SHOULD also list there, using the matchingRuleUse attribute, the SHOULD also list there, using the matchingRuleUse attribute, the
attribute types with which each matching rule can be used. More attribute types with which each matching rule can be used. More
information is given in section 4.5 of [Syntaxes]. information is given in section 4.5 of [Syntaxes].
4.1.9. Result Message 4.1.9. Result Message
The LDAPResult is the construct used in this protocol to return The LDAPResult is the construct used in this protocol to return
success or failure indications from servers to clients. To various success or failure indications from servers to clients. To various
requests, servers will return responses of LDAPResult or responses requests, servers will return responses of LDAPResult or responses
containing the components of LDAPResponse to indicate the final containing the components of LDAPResult to indicate the final status
status of a protocol operation request. of a protocol operation request.
LDAPResult ::= SEQUENCE { LDAPResult ::= SEQUENCE {
resultCode ENUMERATED { resultCode ENUMERATED {
success (0), success (0),
operationsError (1), operationsError (1),
protocolError (2), protocolError (2),
timeLimitExceeded (3), timeLimitExceeded (3),
sizeLimitExceeded (4), sizeLimitExceeded (4),
compareFalse (5), compareFalse (5),
compareTrue (6), compareTrue (6),
authMethodNotSupported (7), authMethodNotSupported (7),
strongAuthRequired (8), strongAuthRequired (8),
-- 9 reserved -- -- 9 reserved --
referral (10), referral (10),
adminLimitExceeded (11), adminLimitExceeded (11),
unavailableCriticalExtension (12), unavailableCriticalExtension (12),
confidentialityRequired (13),
saslBindInProgress (14),
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confidentialityRequired (13),
saslBindInProgress (14),
noSuchAttribute (16), noSuchAttribute (16),
undefinedAttributeType (17), undefinedAttributeType (17),
inappropriateMatching (18), inappropriateMatching (18),
constraintViolation (19), constraintViolation (19),
attributeOrValueExists (20), attributeOrValueExists (20),
invalidAttributeSyntax (21), invalidAttributeSyntax (21),
-- 22-31 unused -- -- 22-31 unused --
noSuchObject (32), noSuchObject (32),
aliasProblem (33), aliasProblem (33),
invalidDNSyntax (34), invalidDNSyntax (34),
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notAllowedOnRDN (67), notAllowedOnRDN (67),
entryAlreadyExists (68), entryAlreadyExists (68),
objectClassModsProhibited (69), objectClassModsProhibited (69),
-- 70 reserved for CLDAP -- -- 70 reserved for CLDAP --
affectsMultipleDSAs (71), affectsMultipleDSAs (71),
-- 72-79 unused -- -- 72-79 unused --
other (80), other (80),
... }, ... },
-- 81-90 reserved for APIs -- -- 81-90 reserved for APIs --
matchedDN LDAPDN, matchedDN LDAPDN,
errorMessage LDAPString, diagnosticMessage LDAPString,
referral [3] Referral OPTIONAL } referral [3] Referral OPTIONAL }
The result codes enumeration is extensible as defined in Section 3.5 The result codes enumeration is extensible as defined in Section 3.5
of [LDAPIANA]. The meanings of the result codes are given in Appendix of [LDAPIANA]. The meanings of the result codes are given in Appendix
A. A.
The errorMessage field of this construct may, at the server's option, The diagnosticMessage field of this construct may, at the server's
be used to return a string containing a textual, human-readable option, be used to return a string containing a textual, human-
(terminal control and page formatting characters should be avoided) readable (terminal control and page formatting characters should be
error diagnostic. As this error diagnostic is not standardized, avoided) diagnostic message. As this diagnostic message is not
implementations MUST NOT rely on the values returned. If the server standardized, implementations MUST NOT rely on the values returned.
chooses not to return a textual diagnostic, the errorMessage field of If the server chooses not to return a textual diagnostic, the
the LDAPResult type MUST contain a zero length string. diagnosticMessage field of the LDAPResult type MUST contain a zero
length string.
For result codes of noSuchObject, aliasProblem, invalidDNSyntax and For certain result codes (typically, but not restricted to
aliasDereferencingProblem, the matchedDN field is set to the name of noSuchObject, aliasProblem, invalidDNSyntax and
the lowest entry (object or alias) in the directory that was matched.
If no aliases were dereferenced while attempting to locate the entry,
this will be a truncated form of the name provided, or if aliases
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aliasDereferencingProblem), the matchedDN field is set to the name of
the lowest entry (object or alias) in the directory that was matched.
If no aliases were dereferenced while attempting to locate the entry,
this will be a truncated form of the name provided, or if aliases
were dereferenced, of the resulting name, as defined in section 12.5 were dereferenced, of the resulting name, as defined in section 12.5
of [X.511]. The matchedDN field contains a zero length string with of [X.511]. The matchedDN field contains a zero length string with
all other result codes. all other result codes.
4.1.10. Referral 4.1.10. Referral
The referral result code indicates that the contacted server does not The referral result code indicates that the contacted server does not
hold the target entry of the request. The referral field is present hold the target entry of the request. The referral field is present
in an LDAPResult if the LDAPResult.resultCode field value is in an LDAPResult if the LDAPResult.resultCode field value is
referral, and absent with all other result codes. It contains one or referral, and absent with all other result codes. It contains one or
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progress the operation, and if it is not present the client will use progress the operation, and if it is not present the client will use
the same name as in the original request. Some servers (e.g. the same name as in the original request. Some servers (e.g.
participating in distributed indexing) may provide a different filter participating in distributed indexing) may provide a different filter
in a referral for a search operation. If the filter part of the URL in a referral for a search operation. If the filter part of the URL
is present in an LDAPURL, the client MUST use this filter in its next is present in an LDAPURL, the client MUST use this filter in its next
request to progress this search, and if it is not present the client request to progress this search, and if it is not present the client
MUST use the same filter as it used for that search. Other aspects of MUST use the same filter as it used for that search. Other aspects of
the new request may be the same or different as the request which the new request may be the same or different as the request which
generated the referral. generated the referral.
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Note that UTF-8 characters appearing in a DN or search filter may not Note that UTF-8 characters appearing in a DN or search filter may not
be legal for URLs (e.g. spaces) and MUST be escaped using the % be legal for URLs (e.g. spaces) and MUST be escaped using the %
method in [RFC2396]. method in [RFC2396].
Other kinds of URLs may be returned, so long as the operation could Other kinds of URLs may be returned, so long as the operation could
be performed using that protocol. be performed using that protocol.
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4.1.11. Controls 4.1.11. Controls
A control is a way to specify extension information for an LDAP A control is a way to specify extension information for an LDAP
message. A control only alters the semantics of the message it is message. A control only alters the semantics of the message it is
attached to. attached to.
Controls ::= SEQUENCE OF Control Controls ::= SEQUENCE OF Control
Control ::= SEQUENCE { Control ::= SEQUENCE {
controlType LDAPOID, controlType LDAPOID,
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MUST be prepared to handle arbitrary contents of the controlValue MUST be prepared to handle arbitrary contents of the controlValue
octet string, including zero bytes. It is absent only if there is no octet string, including zero bytes. It is absent only if there is no
value information which is associated with a control of its type. value information which is associated with a control of its type.
This document does not specify any controls. Controls may be This document does not specify any controls. Controls may be
specified in other documents. The specification of a control consists specified in other documents. The specification of a control consists
of: of:
- the OBJECT IDENTIFIER assigned to the control, - the OBJECT IDENTIFIER assigned to the control,
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- whether the control is always noncritical, always critical, or - whether the control is always noncritical, always critical, or
critical at the client's option, critical at the client's option,
- the format of the controlValue contents of the control, - the format of the controlValue contents of the control,
- the semantics of the control, - the semantics of the control,
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- and optionally, semantics regarding the combination of the control - and optionally, semantics regarding the combination of the control
with other controls. with other controls.
Servers list the controlType of all controls they recognize in the Servers list the controlType of all controls they recognize in the
supportedControl attribute [Models] in the root DSE. supportedControl attribute [Models] in the root DSE.
Controls should not be combined unless the semantics of the Controls should not be combined unless the semantics of the
combination has been specified. The semantics of control combination has been specified. The semantics of control
combinations, if specified, are generally found in the control combinations, if specified, are generally found in the control
specification most recently published. In the absence of combination specification most recently published. In the absence of combination
semantics, the behavior of the operation is undefined. semantics, the behavior of the operation is undefined.
Additionally, the order of a combination of controls in the SEQUENCE Additionally, the order of a combination of controls in the SEQUENCE
is ignored unless the control specification(s) describe(s) is ignored unless the control specification(s) describe(s)
combination semantics. combination semantics.
4.2. Bind Operation 4.2. Bind Operation
The function of the Bind Operation is to allow authentication The function of the Bind Operation is to allow authentication
information to be exchanged between the client and server. Prior to information to be exchanged between the client and server. Prior to
the BindRequest, the implied identity is anonymous. Refer to the first BindRequest, the implied identity is anonymous. Refer to
[AuthMeth] for the authentication-related semantics of this [AuthMeth] for the authentication-related semantics of this
operation. operation.
The Bind Request is defined as follows: The Bind Request is defined as follows:
BindRequest ::= [APPLICATION 0] SEQUENCE { BindRequest ::= [APPLICATION 0] SEQUENCE {
version INTEGER (1 .. 127), version INTEGER (1 .. 127),
name LDAPDN, name LDAPDN,
authentication AuthenticationChoice } authentication AuthenticationChoice }
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SaslCredentials ::= SEQUENCE { SaslCredentials ::= SEQUENCE {
mechanism LDAPString, mechanism LDAPString,
credentials OCTET STRING OPTIONAL } credentials OCTET STRING OPTIONAL }
Parameters of the Bind Request are: Parameters of the Bind Request are:
- version: A version number indicating the version of the protocol - version: A version number indicating the version of the protocol
to be used in this protocol session. This document describes to be used in this protocol session. This document describes
version 3 of the LDAP protocol. Note that there is no version version 3 of the LDAP protocol. Note that there is no version
negotiation, and the client just sets this parameter to the negotiation, and the client just sets this parameter to the
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version it desires. If the server does not support the specified version it desires. If the server does not support the specified
version, it responds with protocolError in the resultCode field of version, it responds with protocolError in the resultCode field of
the BindResponse. the BindResponse.
- name: The name of the directory object that the client wishes to - name: The name of the directory object that the client wishes to
bind as. This field may take on a null value (a zero length bind as. This field may take on a null value (a zero length
string) for the purposes of anonymous binds ([AuthMeth] section 7)
Sermersheim Internet-Draft - Expires May 2003 Page 12 or when using SASL authentication ([AuthMeth] section 4.3). Server
Lightweight Directory Access Protocol Version 3 behavior is undefined when the name is a null value, simple
authentication is used, and a password is specified. The server
string) for the purposes of anonymous binds, when authentication SHOULD NOT perform any alias dereferencing in determining the
has been performed at a lower layer, or when using SASL object to bind as.
credentials with a mechanism that includes the name in the
credentials. Server behavior is undefined when the name is a null
value, simple authentication is used, and a password is specified.
The server SHOULD NOT perform any alias dereferencing in
determining the object to bind as.
- authentication: information used to authenticate the name, if any, - authentication: information used to authenticate the name, if any,
provided in the Bind Request. This type is extensible as defined provided in the Bind Request. This type is extensible as defined
in Section 3.6 of [LDAPIANA]. Servers that do not support a choice in Section 3.6 of [LDAPIANA]. Servers that do not support a choice
supplied by a client will return authMethodNotSupported in the supplied by a client will return authMethodNotSupported in the
result code of the BindResponse. result code of the BindResponse.
Upon receipt of a Bind Request, a protocol server will authenticate
the requesting client, if necessary. The server will then return a
Bind Response to the client indicating the status of the
authentication.
Authorization is the use of this authentication information when Authorization is the use of this authentication information when
performing operations. Authorization MAY be affected by factors performing operations. Authorization MAY be affected by factors
outside of the LDAP Bind request, such as lower layer security outside of the LDAP Bind Request, such as lower layer security
services. services.
4.2.1. Sequencing of the Bind Request 4.2.1. Processing of the Bind Request
Upon receipt of a BindRequest, the server MUST ensure there are no
outstanding operations in progress on the connection (This simplifies
server implementation). The server then proceeds to authenticate the
client in either a single-step, or multi-step bind process. Each step
requires the server to return a BindResponse to indicate the status
of authentication.
If the client did not bind before sending a request and receives an
operationsError, it may then send a Bind Request. If this also fails
or the client chooses not to bind on the existing connection, it may
close the connection, reopen it and begin again by first sending a
PDU with a Bind Request. This will aid in interoperating with servers
implementing other versions of LDAP.
Clients MAY send multiple Bind Requests on a connection to change
their credentials. Authentication from earlier binds is subsequently
ignored. A failed or abandoned Bind Operation has the effect of
leaving the connection in an anonymous state. To arrive at a known
authentication state after abandoning a bind operation, clients may
unbind, rebind, or make use of the BindResponse. If a SASL transfer
encryption or integrity mechanism has been negotiated, and that
mechanism does not support the changing of credentials from one
identity to another, then the client MUST instead establish a new
connection.
For some SASL authentication mechanisms, it may be necessary for the For some SASL authentication mechanisms, it may be necessary for the
client to invoke the BindRequest multiple times. If at any stage the client to invoke the BindRequest multiple times. If at any stage the
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client wishes to abort the bind process it MAY unbind and then drop client wishes to abort the bind process it MAY unbind and then drop
the underlying connection. Clients MUST NOT invoke operations between the underlying connection. Clients MUST NOT invoke operations between
two Bind requests made as part of a multi-stage bind. two Bind Requests made as part of a multi-stage bind.
A client may abort a SASL bind negotiation by sending a BindRequest A client may abort a SASL bind negotiation by sending a BindRequest
with a different value in the mechanism field of SaslCredentials, or with a different value in the mechanism field of SaslCredentials, or
an AuthenticationChoice other than sasl. an AuthenticationChoice other than sasl.
If the client sends a BindRequest with the sasl mechanism field as an If the client sends a BindRequest with the sasl mechanism field as an
empty string, the server MUST return a BindResponse with empty string, the server MUST return a BindResponse with
authMethodNotSupported as the resultCode. This will allow clients to authMethodNotSupported as the resultCode. This will allow clients to
abort a negotiation if it wishes to try again with the same SASL abort a negotiation if it wishes to try again with the same SASL
mechanism. mechanism.
If the client did not bind before sending a request and receives an
operationsError, it may then send a Bind Request. If this also fails
or the client chooses not to bind on the existing connection, it will
close the connection, reopen it and begin again by first sending a
PDU with a Bind Request. This will aid in interoperating with servers
implementing other versions of LDAP.
Clients MAY send multiple bind requests on a connection to change
their credentials. A subsequent bind process has the effect of
abandoning all operations outstanding on the connection. (This
simplifies server implementation.) Authentication from earlier binds
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are subsequently ignored, and so if the bind fails, the connection
will be treated as anonymous. If a SASL transfer encryption or
integrity mechanism has been negotiated, and that mechanism does not
support the changing of credentials from one identity to another,
then the client MUST instead establish a new connection.
4.2.2. Bind Response 4.2.2. Bind Response
The Bind Response is defined as follows. The Bind Response is defined as follows.
BindResponse ::= [APPLICATION 1] SEQUENCE { BindResponse ::= [APPLICATION 1] SEQUENCE {
COMPONENTS OF LDAPResult, COMPONENTS OF LDAPResult,
serverSaslCreds [7] OCTET STRING OPTIONAL } serverSaslCreds [7] OCTET STRING OPTIONAL }
BindResponse consists simply of an indication from the server of the BindResponse consists simply of an indication from the server of the
status of the client's request for authentication. status of the client's request for authentication.
skipping to change at line 776 skipping to change at line 778
- inappropriateAuthentication: the server requires the client which - inappropriateAuthentication: the server requires the client which
had attempted to bind anonymously or without supplying credentials had attempted to bind anonymously or without supplying credentials
to provide some form of credentials. to provide some form of credentials.
- invalidCredentials: the wrong password was supplied or the SASL - invalidCredentials: the wrong password was supplied or the SASL
credentials could not be processed. credentials could not be processed.
- unavailable: the server is shutting down. - unavailable: the server is shutting down.
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If the server does not support the client's requested protocol If the server does not support the client's requested protocol
version, it MUST set the resultCode to protocolError. version, it MUST set the resultCode to protocolError.
If the client receives a BindResponse response where the resultCode If the client receives a BindResponse response where the resultCode
was protocolError, it MUST close the connection as the server will be was protocolError, it MUST close the connection as the server will be
unwilling to accept further operations. (This is for compatibility unwilling to accept further operations. (This is for compatibility
with earlier versions of LDAP, in which the bind was always the first with earlier versions of LDAP, in which the bind was always the first
operation, and there was no negotiation.) operation, and there was no negotiation.)
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The serverSaslCreds are used as part of a SASL-defined bind mechanism The serverSaslCreds are used as part of a SASL-defined bind mechanism
to allow the client to authenticate the server to which it is to allow the client to authenticate the server to which it is
communicating, or to perform "challenge-response" authentication. If communicating, or to perform "challenge-response" authentication. If
the client bound with the simple choice, or the SASL mechanism does the client bound with the simple choice, or the SASL mechanism does
not require the server to return information to the client, then this not require the server to return information to the client, then this
field is not to be included in the result. field is not to be included in the result.
4.3. Unbind Operation 4.3. Unbind Operation
The function of the Unbind Operation is to terminate a protocol The function of the Unbind Operation is to terminate a protocol
skipping to change at line 829 skipping to change at line 831
the messageID is 0 and protocolOp is of the extendedResp form. The the messageID is 0 and protocolOp is of the extendedResp form. The
responseName field of the ExtendedResponse is present. The LDAPOID responseName field of the ExtendedResponse is present. The LDAPOID
value MUST be unique for this notification, and not be used in any value MUST be unique for this notification, and not be used in any
other situation. other situation.
One unsolicited notification (Notice of Disconnection) is defined in One unsolicited notification (Notice of Disconnection) is defined in
this document. this document.
4.4.1. Notice of Disconnection 4.4.1. Notice of Disconnection
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This notification may be used by the server to advise the client that This notification may be used by the server to advise the client that
the server is about to close the connection due to an error the server is about to close the connection due to an error
condition. Note that this notification is NOT a response to an unbind condition. Note that this notification is NOT a response to an unbind
requested by the client: the server MUST follow the procedures of requested by the client: the server MUST follow the procedures of
section 4.3. This notification is intended to assist clients in section 4.3. This notification is intended to assist clients in
distinguishing between an error condition and a transient network distinguishing between an error condition and a transient network
failure. As with a connection close due to network failure, the failure. As with a connection close due to network failure, the
client MUST NOT assume that any outstanding requests which modified client MUST NOT assume that any outstanding requests which modified
the directory have succeeded or failed. the directory have succeeded or failed.
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The responseName is 1.3.6.1.4.1.1466.20036, the response field is The responseName is 1.3.6.1.4.1.1466.20036, the response field is
absent, and the resultCode is used to indicate the reason for the absent, and the resultCode is used to indicate the reason for the
disconnection. disconnection.
The following resultCode values are to be used in this notification: The following resultCode values are to be used in this notification:
- protocolError: The server has received data from the client in - protocolError: The server has received data from the client in
which the LDAPMessage structure could not be parsed. which the LDAPMessage structure could not be parsed.
- strongAuthRequired: The server has detected that an established - strongAuthRequired: The server has detected that an established
skipping to change at line 884 skipping to change at line 886
SearchRequest ::= [APPLICATION 3] SEQUENCE { SearchRequest ::= [APPLICATION 3] SEQUENCE {
baseObject LDAPDN, baseObject LDAPDN,
scope ENUMERATED { scope ENUMERATED {
baseObject (0), baseObject (0),
singleLevel (1), singleLevel (1),
wholeSubtree (2) }, wholeSubtree (2) },
derefAliases ENUMERATED { derefAliases ENUMERATED {
neverDerefAliases (0), neverDerefAliases (0),
derefInSearching (1), derefInSearching (1),
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derefFindingBaseObj (2), derefFindingBaseObj (2),
derefAlways (3) }, derefAlways (3) },
sizeLimit INTEGER (0 .. maxInt), sizeLimit INTEGER (0 .. maxInt),
timeLimit INTEGER (0 .. maxInt), timeLimit INTEGER (0 .. maxInt),
typesOnly BOOLEAN, typesOnly BOOLEAN,
filter Filter, filter Filter,
attributes AttributeDescriptionList } attributes AttributeDescriptionList }
Filter ::= CHOICE { Filter ::= CHOICE {
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and [0] SET SIZE (1..MAX) OF Filter, and [0] SET SIZE (1..MAX) OF Filter,
or [1] SET SIZE (1..MAX) OF Filter, or [1] SET SIZE (1..MAX) OF Filter,
not [2] Filter, not [2] Filter,
equalityMatch [3] AttributeValueAssertion, equalityMatch [3] AttributeValueAssertion,
substrings [4] SubstringFilter, substrings [4] SubstringFilter,
greaterOrEqual [5] AttributeValueAssertion, greaterOrEqual [5] AttributeValueAssertion,
lessOrEqual [6] AttributeValueAssertion, lessOrEqual [6] AttributeValueAssertion,
present [7] AttributeDescription, present [7] AttributeDescription,
approxMatch [8] AttributeValueAssertion, approxMatch [8] AttributeValueAssertion,
extensibleMatch [9] MatchingRuleAssertion } extensibleMatch [9] MatchingRuleAssertion }
skipping to change at line 943 skipping to change at line 945
X.501) are to be handled in searching. The semantics of the X.501) are to be handled in searching. The semantics of the
possible values of this field are: possible values of this field are:
neverDerefAliases: do not dereference aliases in searching neverDerefAliases: do not dereference aliases in searching
or in locating the base object of the search; or in locating the base object of the search;
derefInSearching: dereference aliases in subordinates of derefInSearching: dereference aliases in subordinates of
the base object in searching, but not in locating the base the base object in searching, but not in locating the base
object of the search; object of the search;
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derefFindingBaseObj: dereference aliases in locating the derefFindingBaseObj: dereference aliases in locating the
base object of the search, but not when searching base object of the search, but not when searching
subordinates of the base object; subordinates of the base object;
derefAlways: dereference aliases both in searching and in derefAlways: dereference aliases both in searching and in
locating the base object of the search. locating the base object of the search.
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- sizeLimit: A size limit that restricts the maximum number of - sizeLimit: A size limit that restricts the maximum number of
entries to be returned as a result of the search. A value of 0 in entries to be returned as a result of the search. A value of 0 in
this field indicates that no client-requested size limit this field indicates that no client-requested size limit
restrictions are in effect for the search. Servers may enforce a restrictions are in effect for the search. Servers may enforce a
maximum number of entries to return. maximum number of entries to return.
- timeLimit: A time limit that restricts the maximum time (in - timeLimit: A time limit that restricts the maximum time (in
seconds) allowed for a search. A value of 0 in this field seconds) allowed for a search. A value of 0 in this field
indicates that no client-requested time limit restrictions are in indicates that no client-requested time limit restrictions are in
effect for the search. effect for the search.
skipping to change at line 999 skipping to change at line 1001
A filter of the "and" choice is TRUE if all the filters in the SET A filter of the "and" choice is TRUE if all the filters in the SET
OF evaluate to TRUE, FALSE if at least one filter is FALSE, and OF evaluate to TRUE, FALSE if at least one filter is FALSE, and
otherwise Undefined. A filter of the "or" choice is FALSE if all otherwise Undefined. A filter of the "or" choice is FALSE if all
of the filters in the SET OF evaluate to FALSE, TRUE if at least of the filters in the SET OF evaluate to FALSE, TRUE if at least
one filter is TRUE, and Undefined otherwise. A filter of the "not" one filter is TRUE, and Undefined otherwise. A filter of the "not"
choice is TRUE if the filter being negated is FALSE, FALSE if it choice is TRUE if the filter being negated is FALSE, FALSE if it
is TRUE, and Undefined if it is Undefined. is TRUE, and Undefined if it is Undefined.
The present match evaluates to TRUE where there is an attribute or The present match evaluates to TRUE where there is an attribute or
subtype of the specified attribute description present in an subtype of the specified attribute description present in an
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entry, and FALSE otherwise (including a presence test with an entry, and FALSE otherwise (including a presence test with an
unrecognized attribute description.) unrecognized attribute description.)
The matching rule and assertion syntax for equalityMatch filter The matching rule and assertion syntax for equalityMatch filter
items is defined by the EQUALITY matching rule for the attribute items is defined by the EQUALITY matching rule for the attribute
type. type.
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The matching rule and assertion syntax for AssertionValues in a The matching rule and assertion syntax for AssertionValues in a
substrings filter item is defined by the SUBSTR matching rule for substrings filter item is defined by the SUBSTR matching rule for
the attribute type. the attribute type.
The matching rule and assertion syntax for greaterOrEqual and The matching rule and assertion syntax for greaterOrEqual and
lessOrEqual filter items is defined by the ORDERING matching rule lessOrEqual filter items is defined by the ORDERING matching rule
for the attribute type. for the attribute type.
The matching rule and assertion syntax for approxMatch filter The matching rule and assertion syntax for approxMatch filter
items is implementation-defined. If approximate matching is not items is implementation-defined. If approximate matching is not
skipping to change at line 1035 skipping to change at line 1038
is absent and matchingRule is present, the matchValue is compared is absent and matchingRule is present, the matchValue is compared
against all attributes in an entry which support that against all attributes in an entry which support that
matchingRule, and the matchingRule determines the syntax for the matchingRule, and the matchingRule determines the syntax for the
assertion value (the filter item evaluates to TRUE if it matches assertion value (the filter item evaluates to TRUE if it matches
with at least one attribute in the entry, FALSE if it does not with at least one attribute in the entry, FALSE if it does not
match any attribute in the entry, and Undefined if the match any attribute in the entry, and Undefined if the
matchingRule is not recognized or the assertionValue cannot be matchingRule is not recognized or the assertionValue cannot be
parsed.) If the type field is present and matchingRule is present, parsed.) If the type field is present and matchingRule is present,
the matchingRule MUST be one permitted for use with that type, the matchingRule MUST be one permitted for use with that type,
otherwise the filter item is undefined. If the dnAttributes field otherwise the filter item is undefined. If the dnAttributes field
is set to TRUE, the match is applied against all the attributes in is set to TRUE, the match is applied against all the
an entry's distinguished name as well, and also evaluates to TRUE AttributeValueAssertions in an entry's distinguished name as well,
if there is at least one attribute in the distinguished name for and also evaluates to TRUE if there is at least one attribute in
which the filter item evaluates to TRUE. (Editors note: The the distinguished name for which the filter item evaluates to
dnAttributes field is present so that there does not need to be TRUE. (Editors note: The dnAttributes field is present so that
multiple versions of generic matching rules such as for word there does not need to be multiple versions of generic matching
matching, one to apply to entries and another to apply to entries rules such as for word matching, one to apply to entries and
and dn attributes as well). another to apply to entries and dn attributes as well).
A filter item evaluates to Undefined when the server would not be A filter item evaluates to Undefined when the server would not be
able to determine whether the assertion value matches an entry. If able to determine whether the assertion value matches an entry. If
an attribute description in an equalityMatch, substrings, an attribute description in an equalityMatch, substrings,
greaterOrEqual, lessOrEqual, approxMatch or extensibleMatch filter greaterOrEqual, lessOrEqual, approxMatch or extensibleMatch filter
is not recognized by the server, a matching rule id in the is not recognized by the server, a matching rule id in the
extensibleMatch is not recognized by the server, the assertion extensibleMatch is not recognized by the server, the assertion
value cannot be parsed, or the type of filtering requested is not value cannot be parsed, or the type of filtering requested is not
implemented, then the filter is Undefined. Thus for example if a implemented, then the filter is Undefined. Thus for example if a
server did not recognize the attribute type shoeSize, a filter of server did not recognize the attribute type shoeSize, a filter of
(shoeSize=*) would evaluate to FALSE, and the filters (shoeSize=*) would evaluate to FALSE, and the filters
(shoeSize=12), (shoeSize>=12) and (shoeSize<=12) would evaluate to (shoeSize=12), (shoeSize>=12) and (shoeSize<=12) would evaluate to
Undefined. Undefined.
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Servers MUST NOT return errors if attribute descriptions or Servers MUST NOT return errors if attribute descriptions or
matching rule ids are not recognized, or assertion values cannot matching rule ids are not recognized, or assertion values cannot
be parsed. More details of filter processing are given in section be parsed. More details of filter processing are given in section
7.8 of [X.511]. 7.8 of [X.511].
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- attributes: A list of the attributes to be returned from each - attributes: A list of the attributes to be returned from each
entry which matches the search filter. There are two special entry which matches the search filter. There are two special
values which may be used: an empty list with no attributes, and values which may be used: an empty list with no attributes, and
the attribute description string "*". Both of these signify that the attribute description string "*". Both of these signify that
all user attributes are to be returned. (The "*" allows the client all user attributes are to be returned. (The "*" allows the client
to request all user attributes in addition to any specified to request all user attributes in addition to any specified
operational attributes). operational attributes).
Attributes MUST be named at most once in the list, and are Attributes MUST be named at most once in the list, and are
returned at most once in an entry. If there are attribute returned at most once in an entry. If there are attribute
skipping to change at line 1112 skipping to change at line 1115
The results of the search attempted by the server upon receipt of a The results of the search attempted by the server upon receipt of a
Search Request are returned in Search Responses, which are LDAP Search Request are returned in Search Responses, which are LDAP
messages containing either SearchResultEntry, SearchResultReference, messages containing either SearchResultEntry, SearchResultReference,
or SearchResultDone data types. or SearchResultDone data types.
SearchResultEntry ::= [APPLICATION 4] SEQUENCE { SearchResultEntry ::= [APPLICATION 4] SEQUENCE {
objectName LDAPDN, objectName LDAPDN,
attributes PartialAttributeList } attributes PartialAttributeList }
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PartialAttributeList ::= SEQUENCE OF SEQUENCE { PartialAttributeList ::= SEQUENCE OF SEQUENCE {
type AttributeDescription, type AttributeDescription,
vals SET OF AttributeValue } vals SET OF AttributeValue }
-- implementors should note that the PartialAttributeList may -- implementors should note that the PartialAttributeList may
-- have zero elements (if none of the attributes of that entry -- have zero elements (if none of the attributes of that entry
-- were requested, or could be returned), and that the vals set -- were requested, or could be returned), and that the vals set
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-- may also have zero elements (if types only was requested, or -- may also have zero elements (if types only was requested, or
-- all values were excluded from the result.) -- all values were excluded from the result.)
SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL
-- at least one LDAPURL element must be present -- at least one LDAPURL element must be present
SearchResultDone ::= [APPLICATION 5] LDAPResult SearchResultDone ::= [APPLICATION 5] LDAPResult
Upon receipt of a Search Request, a server will perform the necessary Upon receipt of a Search Request, a server will perform the necessary
search of the DIT. search of the DIT.
skipping to change at line 1147 skipping to change at line 1149
during the search. There may also be zero or more responses during the search. There may also be zero or more responses
containing SearchResultReference, one for each area not explored by containing SearchResultReference, one for each area not explored by
this server during the search. The SearchResultEntry and this server during the search. The SearchResultEntry and
SearchResultReference PDUs may come in any order. Following all the SearchResultReference PDUs may come in any order. Following all the
SearchResultReference responses and all SearchResultEntry responses SearchResultReference responses and all SearchResultEntry responses
to be returned by the server, the server will return a response to be returned by the server, the server will return a response
containing the SearchResultDone, which contains an indication of containing the SearchResultDone, which contains an indication of
success, or detailing any errors that have occurred. success, or detailing any errors that have occurred.
Each entry returned in a SearchResultEntry will contain all Each entry returned in a SearchResultEntry will contain all
attributes, complete with associated values if necessary, as appropriate attributes as specified in the attributes field of the
specified in the attributes field of the Search Request. Return of Search Request. Return of attributes is subject to access control and
attributes is subject to access control and other administrative other administrative policy.
policy.
Some attributes may be constructed by the server and appear in a Some attributes may be constructed by the server and appear in a
SearchResultEntry attribute list, although they are not stored SearchResultEntry attribute list, although they are not stored
attributes of an entry. Clients SHOULD NOT assume that all attributes attributes of an entry. Clients SHOULD NOT assume that all attributes
can be modified, even if permitted by access control. can be modified, even if permitted by access control.
If the serverÆs schema defines a textual name for an attribute type, If the server's schema defines a textual name for an attribute type,
it MUST use a textual name for attributes of that attribute type by it MUST use a textual name for attributes of that attribute type by
specifying one of the textual names as the value of the attribute specifying one of the textual names as the value of the attribute
type. Otherwise, the server uses the object identifier for the type. Otherwise, the server uses the object identifier for the
attribute type by specifying the object identifier, in ldapOID form, attribute type by specifying the object identifier, in ldapOID form,
as the value of attribute type. as the value of attribute type.
4.5.3. Continuation References in the Search Result 4.5.3. Continuation References in the Search Result
If the server was able to locate the entry referred to by the If the server was able to locate the entry referred to by the
baseObject but was unable to search all the entries in the scope at baseObject but was unable to search all the entries in the scope at
and under the baseObject, the server may return one or more and under the baseObject, the server may return one or more
SearchResultReference entries, each containing a reference to another SearchResultReference entries, each containing a reference to another
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set of servers for continuing the operation. A server MUST NOT return set of servers for continuing the operation. A server MUST NOT return
any SearchResultReference if it has not located the baseObject and any SearchResultReference if it has not located the baseObject and
thus has not searched any entries; in this case it would return a thus has not searched any entries; in this case it would return a
SearchResultDone containing a referral resultCode. SearchResultDone containing a referral resultCode.
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Lightweight Directory Access Protocol Version 3 context, it may use the search filter to determine whether or not to
return a SearchResultReference response. Otherwise
In the absence of indexing information provided to a server from SearchResultReference responses are always returned when in scope.
servers holding subordinate naming contexts, SearchResultReference
responses are not affected by search filters and are always returned
when in scope.
The SearchResultReference is of the same data type as the Referral. The SearchResultReference is of the same data type as the Referral.
URLs for servers implementing the LDAP protocol are written according URLs for servers implementing the LDAP protocol are written according
to [LDAPDN]. The <dn> part MUST be present in the URL, with the new to [LDAPDN]. The <dn> part MUST be present in the URL, with the new
target object name. The client MUST use this name in its next target object name. The client MUST use this name in its next
request. Some servers (e.g. part of a distributed index exchange request. Some servers (e.g. part of a distributed index exchange
system) may provide a different filter in the URLs of the system) may provide a different filter in the URLs of the
SearchResultReference. If the filter part of the URL is present in an SearchResultReference. If the filter part of the URL is present in an
LDAP URL, the client MUST use the new filter in its next request to LDAP URL, the client MUST use the new filter in its next request to
progress the search, and if the filter part is absent the client will progress the search, and if the filter part is absent the client will
skipping to change at line 1226 skipping to change at line 1228
"OU=Roles,DC=Example,DC=NET". If a subtree search of "OU=Roles,DC=Example,DC=NET". If a subtree search of
"DC=Example,DC=NET" is requested to the contacted server, it may "DC=Example,DC=NET" is requested to the contacted server, it may
return the following: return the following:
SearchResultEntry for DC=Example,DC=NET SearchResultEntry for DC=Example,DC=NET
SearchResultEntry for CN=Manager,DC=Example,DC=NET SearchResultEntry for CN=Manager,DC=Example,DC=NET
SearchResultReference { SearchResultReference {
ldap://hostb/OU=People,DC=Example,DC=NET ldap://hostb/OU=People,DC=Example,DC=NET
ldap://hostc/OU=People,DC=Example,DC=NET ldap://hostc/OU=People,DC=Example,DC=NET
} }
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SearchResultReference { SearchResultReference {
ldap://hostd/OU=Roles,DC=Example,DC=NET ldap://hostd/OU=Roles,DC=Example,DC=NET
} }
SearchResultDone (success) SearchResultDone (success)
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Client implementors should note that when following a Client implementors should note that when following a
SearchResultReference, additional SearchResultReference may be SearchResultReference, additional SearchResultReference may be
generated. Continuing the example, if the client contacted the server generated. Continuing the example, if the client contacted the server
(hostb) and issued the search for the subtree (hostb) and issued the search for the subtree
"OU=People,DC=Example,DC=NET", the server might respond as follows: "OU=People,DC=Example,DC=NET", the server might respond as follows:
SearchResultEntry for OU=People,DC=Example,DC=NET SearchResultEntry for OU=People,DC=Example,DC=NET
SearchResultReference { SearchResultReference {
ldap://hoste/OU=Managers,OU=People,DC=Example,DC=NET ldap://hoste/OU=Managers,OU=People,DC=Example,DC=NET
} }
skipping to change at line 1281 skipping to change at line 1284
modification AttributeTypeAndValues } } modification AttributeTypeAndValues } }
AttributeTypeAndValues ::= SEQUENCE { AttributeTypeAndValues ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
vals SET OF AttributeValue } vals SET OF AttributeValue }
Parameters of the Modify Request are: Parameters of the Modify Request are:
- object: The object to be modified. The value of this field - object: The object to be modified. The value of this field
contains the DN of the entry to be modified. The server will not contains the DN of the entry to be modified. The server will not
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perform any alias dereferencing in determining the object to be perform any alias dereferencing in determining the object to be
modified. modified.
- modification: A list of modifications to be performed on the - modification: A list of modifications to be performed on the
entry. The entire list of entry modifications MUST be performed in entry. The entire list of entry modifications MUST be performed in
the order they are listed, as a single atomic operation. While the order they are listed, as a single atomic operation. While
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individual modifications may violate the directory schema, the individual modifications may violate the directory schema, the
resulting entry after the entire list of modifications is resulting entry after the entire list of modifications is
performed MUST conform to the requirements of the directory performed MUST conform to the requirements of the directory
schema. The values that may be taken on by the 'operation' field schema. The values that may be taken on by the 'operation' field
in each modification construct have the following semantics in each modification construct have the following semantics
respectively: respectively:
add: add values listed to the given attribute, creating the add: add values listed to the given attribute, creating the
attribute if necessary; attribute if necessary;
skipping to change at line 1338 skipping to change at line 1341
performed if the Modify Response indicates successful completion of performed if the Modify Response indicates successful completion of
the Modify Operation. If the connection fails, whether the the Modify Operation. If the connection fails, whether the
modification occurred or not is indeterminate. modification occurred or not is indeterminate.
The Modify Operation cannot be used to remove from an entry any of The Modify Operation cannot be used to remove from an entry any of
its distinguished values, those values which form the entry's its distinguished values, those values which form the entry's
relative distinguished name. An attempt to do so will result in the relative distinguished name. An attempt to do so will result in the
server returning the error notAllowedOnRDN. The Modify DN Operation server returning the error notAllowedOnRDN. The Modify DN Operation
described in section 4.9 is used to rename an entry. described in section 4.9 is used to rename an entry.
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If an EQUALITY matching rule has not been defined for an attribute If an EQUALITY matching rule has not been defined for an attribute
type, clients MUST NOT attempt to add or delete individual values of type, clients MUST NOT attempt to add or delete individual values of
that attribute from an entry using the "add" or "delete" form of a that attribute from an entry using the "add" or "delete" form of a
modification, and MUST instead use the "replace" form. modification, and MUST instead use the "replace" form.
Note that due to the simplifications made in LDAP, there is not a Note that due to the simplifications made in LDAP, there is not a
direct mapping of the modifications in an LDAP ModifyRequest onto the direct mapping of the modifications in an LDAP ModifyRequest onto the
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EntryModifications of a DAP ModifyEntry operation, and different EntryModifications of a DAP ModifyEntry operation, and different
implementations of LDAP-DAP gateways may use different means of implementations of LDAP-DAP gateways may use different means of
representing the change. If successful, the final effect of the representing the change. If successful, the final effect of the
operations on the entry MUST be identical. operations on the entry MUST be identical.
4.7. Add Operation 4.7. Add Operation
The Add Operation allows a client to request the addition of an entry The Add Operation allows a client to request the addition of an entry
into the directory. The Add Request is defined as follows: into the directory. The Add Request is defined as follows:
skipping to change at line 1396 skipping to change at line 1398
the error noSuchObject with the matchedDN field containing "DC=NET". the error noSuchObject with the matchedDN field containing "DC=NET".
If the parent entry exists but is not in a naming context held by the If the parent entry exists but is not in a naming context held by the
server, the server SHOULD return a referral to the server holding the server, the server SHOULD return a referral to the server holding the
parent entry. parent entry.
Servers implementations SHOULD NOT restrict where entries can be Servers implementations SHOULD NOT restrict where entries can be
located in the directory unless DIT structure rules are in place. located in the directory unless DIT structure rules are in place.
Some servers MAY allow the administrator to restrict the classes of Some servers MAY allow the administrator to restrict the classes of
entries which can be added to the directory. entries which can be added to the directory.
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Upon receipt of an Add Request, a server will attempt to perform the Upon receipt of an Add Request, a server will attempt to perform the
add requested. The result of the add attempt will be returned to the add requested. The result of the add attempt will be returned to the
client in the Add Response, defined as follows: client in the Add Response, defined as follows:
AddResponse ::= [APPLICATION 9] LDAPResult AddResponse ::= [APPLICATION 9] LDAPResult
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A response of success indicates that the new entry is present in the A response of success indicates that the new entry is present in the
directory. directory.
4.8. Delete Operation 4.8. Delete Operation
The Delete Operation allows a client to request the removal of an The Delete Operation allows a client to request the removal of an
entry from the directory. The Delete Request is defined as follows: entry from the directory. The Delete Request is defined as follows:
DelRequest ::= [APPLICATION 10] LDAPDN DelRequest ::= [APPLICATION 10] LDAPDN
skipping to change at line 1434 skipping to change at line 1436
DelResponse ::= [APPLICATION 11] LDAPResult DelResponse ::= [APPLICATION 11] LDAPResult
Upon receipt of a Delete Request, a server will attempt to perform Upon receipt of a Delete Request, a server will attempt to perform
the entry removal requested. The result of the delete attempt will be the entry removal requested. The result of the delete attempt will be
returned to the client in the Delete Response. returned to the client in the Delete Response.
4.9. Modify DN Operation 4.9. Modify DN Operation
The Modify DN Operation allows a client to change the leftmost (least The Modify DN Operation allows a client to change the leftmost (least
significant) component of the name of an entry in the directory, or significant) component of the name of an entry in the directory,
to move a subtree of entries to a new location in the directory. The and/or to move a subtree of entries to a new location in the
Modify DN Request is defined as follows: directory. The Modify DN Request is defined as follows:
ModifyDNRequest ::= [APPLICATION 12] SEQUENCE { ModifyDNRequest ::= [APPLICATION 12] SEQUENCE {
entry LDAPDN, entry LDAPDN,
newrdn RelativeLDAPDN, newrdn RelativeLDAPDN,
deleteoldrdn BOOLEAN, deleteoldrdn BOOLEAN,
newSuperior [0] LDAPDN OPTIONAL } newSuperior [0] LDAPDN OPTIONAL }
Parameters of the Modify DN Request are: Parameters of the Modify DN Request are:
- entry: the Distinguished Name of the entry to be changed. This - entry: the Distinguished Name of the entry to be changed. This
entry may or may not have subordinate entries. Note that the entry may or may not have subordinate entries. Note that the
server will not dereference any aliases in locating the entry to server will not dereference any aliases in locating the entry to
be changed. be changed.
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- newrdn: the RDN that will form the leftmost component of the new - newrdn: the RDN that will form the leftmost component of the new
name of the entry. name of the entry.
- deleteoldrdn: a boolean parameter that controls whether the old - deleteoldrdn: a boolean parameter that controls whether the old
RDN attribute values are to be retained as attributes of the RDN attribute values are to be retained as attributes of the
entry, or deleted from the entry. entry, or deleted from the entry.
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- newSuperior: if present, this is the Distinguished Name of the - newSuperior: if present, this is the Distinguished Name of the
entry which becomes the immediate superior of the existing entry. entry which becomes the immediate superior of the existing entry.
The result of the name change attempted by the server upon receipt of The result of the name change attempted by the server upon receipt of
a Modify DN Request is returned in the Modify DN Response, defined as a Modify DN Request is returned in the Modify DN Response, defined as
follows: follows:
ModifyDNResponse ::= [APPLICATION 13] LDAPResult ModifyDNResponse ::= [APPLICATION 13] LDAPResult
Upon receipt of a ModifyDNRequest, a server will attempt to perform Upon receipt of a ModifyDNRequest, a server will attempt to perform
skipping to change at line 1507 skipping to change at line 1509
The Compare Operation allows a client to compare an assertion The Compare Operation allows a client to compare an assertion
provided with an entry in the directory. The Compare Request is provided with an entry in the directory. The Compare Request is
defined as follows: defined as follows:
CompareRequest ::= [APPLICATION 14] SEQUENCE { CompareRequest ::= [APPLICATION 14] SEQUENCE {
entry LDAPDN, entry LDAPDN,
ava AttributeValueAssertion } ava AttributeValueAssertion }
Parameters of the Compare Request are: Parameters of the Compare Request are:
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- entry: the name of the entry to be compared with. Note that the - entry: the name of the entry to be compared with. Note that the
server SHOULD NOT dereference any aliases in locating the entry to server SHOULD NOT dereference any aliases in locating the entry to
be compared with. be compared with.
- ava: the assertion with which an attribute in the entry is to be - ava: the assertion with which an attribute in the entry is to be
compared. compared.
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The result of the compare attempted by the server upon receipt of a The result of the compare attempted by the server upon receipt of a
Compare Request is returned in the Compare Response, defined as Compare Request is returned in the Compare Response, defined as
follows: follows:
CompareResponse ::= [APPLICATION 15] LDAPResult CompareResponse ::= [APPLICATION 15] LDAPResult
Upon receipt of a Compare Request, a server will attempt to perform Upon receipt of a Compare Request, a server will attempt to perform
the requested comparison using the EQUALITY matching rule for the the requested comparison using the EQUALITY matching rule for the
attribute type. The result of the comparison will be returned to the attribute type. The result of the comparison will be returned to the
client in the Compare Response. Note that errors and the result of client in the Compare Response. Note that errors and the result of
comparison are all returned in the same construct. comparison are all returned in the same construct.
Note that some directory systems may establish access controls which Note that some directory systems may establish access controls which
permit the values of certain attributes (such as userPassword) to be permit the values of certain attributes (such as userPassword) to be
compared but not read. compared but not interrogated by other means.
4.11. Abandon Operation 4.11. Abandon Operation
The function of the Abandon Operation is to allow a client to request The function of the Abandon Operation is to allow a client to request
that the server abandon an outstanding operation. The Abandon Request that the server abandon an outstanding operation. The Abandon Request
is defined as follows: is defined as follows:
AbandonRequest ::= [APPLICATION 16] MessageID AbandonRequest ::= [APPLICATION 16] MessageID
The MessageID MUST be that of an operation which was requested The MessageID MUST be that of an operation which was requested
skipping to change at line 1561 skipping to change at line 1563
abandoned by performing a subsequent bind operation. abandoned by performing a subsequent bind operation.
Abandon and Unbind operations cannot be abandoned. The ability to Abandon and Unbind operations cannot be abandoned. The ability to
abandon other (particularly update) operations is at the discretion abandon other (particularly update) operations is at the discretion
of the server. of the server.
In the event that a server receives an Abandon Request on a Search In the event that a server receives an Abandon Request on a Search
Operation in the midst of transmitting responses to the search, that Operation in the midst of transmitting responses to the search, that
server MUST cease transmitting entry responses to the abandoned server MUST cease transmitting entry responses to the abandoned
request immediately, and MUST NOT send the SearchResponseDone. Of request immediately, and MUST NOT send the SearchResponseDone. Of
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course, the server MUST ensure that only properly encoded LDAPMessage course, the server MUST ensure that only properly encoded LDAPMessage
PDUs are transmitted. PDUs are transmitted.
Clients MUST NOT send abandon requests for the same operation Clients MUST NOT send abandon requests for the same operation
multiple times, and MUST also be prepared to receive results from multiple times, and MUST also be prepared to receive results from
operations it has abandoned (since these may have been in transit operations it has abandoned (since these may have been in transit
when the abandon was requested, or are not able to be abandoned). when the abandon was requested, or are not able to be abandoned).
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Servers MUST discard abandon requests for message IDs they do not Servers MUST discard abandon requests for message IDs they do not
recognize, for operations which cannot be abandoned, and for recognize, for operations which cannot be abandoned, and for
operations which have already been abandoned. operations which have already been abandoned.
4.12. Extended Operation 4.12. Extended Operation
An extension mechanism has been added in this version of LDAP, in An extension mechanism has been added in this version of LDAP, in
order to allow additional operations to be defined for services not order to allow additional operations to be defined for services not
available elsewhere in this protocol, for instance digitally signed available elsewhere in this protocol, for instance digitally signed
operations and results. operations and results.
skipping to change at line 1617 skipping to change at line 1620
protocolError result code. protocolError result code.
4.13. Start TLS Operation 4.13. Start TLS Operation
The Start Transport Layer Security (StartTLS) operation provides the The Start Transport Layer Security (StartTLS) operation provides the
ability to establish Transport Layer Security [RFC2246] on an LDAP ability to establish Transport Layer Security [RFC2246] on an LDAP
connection. connection.
4.13.1. Start TLS Request 4.13.1. Start TLS Request
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A client requests TLS establishment by transmitting a Start TLS A client requests TLS establishment by transmitting a Start TLS
request PDU to the server. The Start TLS request is defined in terms request PDU to the server. The Start TLS request is defined in terms
of an ExtendedRequest. The requestName is "1.3.6.1.4.1.1466.20037", of an ExtendedRequest. The requestName is "1.3.6.1.4.1.1466.20037",
and the requestValue field is absent. and the requestValue field is absent.
The client MUST NOT send any PDUs on this connection following this The client MUST NOT send any PDUs on this connection following this
request until it receives a Start TLS extended response. request until it receives a Start TLS extended response.
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4.13.2. Start TLS Response 4.13.2. Start TLS Response
When a Start TLS request is made, servers supporting the operation When a Start TLS request is made, servers supporting the operation
MUST return a Start TLS response PDU to the requestor. The Start TLS MUST return a Start TLS response PDU to the requestor. The Start TLS
response responseName is also "1.3.6.1.4.1.1466.20037", and the response responseName is also "1.3.6.1.4.1.1466.20037", and the
response field is absent. response field is absent.
The server MUST set the resultCode field to either success or one of The server MUST set the resultCode field to either success or one of
the other values outlined in section 4.13.2.2. the other values outlined in section 4.13.2.2.
skipping to change at line 1672 skipping to change at line 1675
The server MUST return operationsError if the client violates any of The server MUST return operationsError if the client violates any of
the Start TLS extended operation sequencing requirements described in the Start TLS extended operation sequencing requirements described in
section 5.3 of [AuthMeth]. section 5.3 of [AuthMeth].
If the server does not support TLS (whether by design or by current If the server does not support TLS (whether by design or by current
configuration), it MUST set the resultCode to protocolError, or to configuration), it MUST set the resultCode to protocolError, or to
referral. The server MUST include an actual referral value in the referral. The server MUST include an actual referral value in the
LDAP Result if it returns a resultCode of referral. The client's LDAP Result if it returns a resultCode of referral. The client's
current session is unaffected if the server does not support TLS. The current session is unaffected if the server does not support TLS. The
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client MAY proceed with any LDAP operation, or it MAY close the client MAY proceed with any LDAP operation, or it MAY close the
connection. connection.
The server MUST return unavailable if it supports TLS but cannot The server MUST return unavailable if it supports TLS but cannot
establish a TLS connection for some reason, e.g. the certificate establish a TLS connection for some reason, e.g. the certificate
server not responding, it cannot contact its TLS implementation, or server not responding, it cannot contact its TLS implementation, or
if the server is in process of shutting down. The client MAY retry if the server is in process of shutting down. The client MAY retry
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the StartTLS operation, or it MAY proceed with any other LDAP the StartTLS operation, or it MAY proceed with any other LDAP
operation, or it MAY close the connection. operation, or it MAY close the connection.
4.13.3. Closing a TLS Connection 4.13.3. Closing a TLS Connection
Two forms of TLS connection closure--graceful and abrupt--are Two forms of TLS connection closure--graceful and abrupt--are
supported. supported.
4.13.3.1. Graceful Closure 4.13.3.1. Graceful Closure
Either the client or server MAY terminate the TLS connection on an Either the client or server MAY terminate the TLS connection and
LDAP association by sending a TLS closure alert. leave the LDAP session intact by sending a TLS closure alert.
Before closing a TLS connection, the client MUST either wait for any Before sending a TLS closure alert, the client MUST either wait for
outstanding LDAP operations to complete, or explicitly abandon them. any outstanding LDAP operations to complete, or explicitly abandon
them.
After the initiator of a close has sent a TLS closure alert, it MUST After the initiator of a close has sent a TLS closure alert, it MUST
discard any TLS messages until it has received a TLS closure alert discard any TLS messages until it has received a TLS closure alert
from the other party. It will cease to send TLS Record Protocol from the other party. It will cease to send TLS Record Protocol
PDUs, and following the receipt of the alert, MAY send and receive PDUs, and following the receipt of the alert, MAY send and receive
LDAP PDUs. LDAP PDUs.
The other party, if it receives a TLS closure alert, MUST immediately The other party, if it receives a TLS closure alert, MUST immediately
transmit a TLS closure alert. It will subsequently cease to send TLS transmit a TLS closure alert. It will subsequently cease to send TLS
Record Protocol PDUs, and MAY send and receive LDAP PDUs. Record Protocol PDUs, and MAY send and receive LDAP PDUs.
4.13.3.2. Abrupt Closure 4.13.3.2. Abrupt Closure
Either the client or server MAY abruptly close the entire LDAP Either the client or server MAY abruptly close the TLS connection by
association and any TLS connection established on it by dropping the dropping the underlying transfer protocol connection. In this
underlying TCP connection. In this circumstance, a server MAY send circumstance, a server MAY send the client a Notice of Disconnection
the client a Notice of Disconnection before dropping the TCP before dropping the underlying connection.
connection.
5. Protocol Element Encodings and Transfer 5. Protocol Element Encodings and Transfer
One underlying service is defined here. Clients and servers SHOULD One underlying service is defined here. Clients and servers SHOULD
implement the mapping of LDAP over TCP described in 5.2.1. implement the mapping of LDAP over TCP described in 5.2.1.
5.1. Protocol Encoding 5.1. Protocol Encoding
The protocol elements of LDAP are encoded for exchange using the The protocol elements of LDAP are encoded for exchange using the
Basic Encoding Rules (BER) [X.690] of ASN.1 [X.680]. However, due to Basic Encoding Rules (BER) [X.690] of ASN.1 [X.680]. However, due to
the high overhead involved in using certain elements of the BER, the the high overhead involved in using certain elements of the BER, the
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following additional restrictions are placed on BER-encodings of LDAP following additional restrictions are placed on BER-encodings of LDAP
protocol elements: protocol elements:
(1) Only the definite form of length encoding will be used. (1) Only the definite form of length encoding will be used.
(2) OCTET STRING values will be encoded in the primitive form only. (2) OCTET STRING values will be encoded in the primitive form only.
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(3) If the value of a BOOLEAN type is true, the encoding MUST have (3) If the value of a BOOLEAN type is true, the encoding MUST have
its contents octets set to hex "FF". its contents octets set to hex "FF".
(4) If a value of a type is its default value, it MUST be absent. (4) If a value of a type is its default value, it MUST be absent.
Only some BOOLEAN and INTEGER types have default values in this Only some BOOLEAN and INTEGER types have default values in this
protocol definition. protocol definition.
These restrictions do not apply to ASN.1 types encapsulated inside of These restrictions do not apply to ASN.1 types encapsulated inside of
OCTET STRING values, such as attribute values, unless otherwise OCTET STRING values, such as attribute values, unless otherwise
noted. noted.
skipping to change at line 1779 skipping to change at line 1783
The server MUST be capable of recognizing all the mandatory attribute The server MUST be capable of recognizing all the mandatory attribute
type names and implement the syntaxes specified in [Syntaxes]. type names and implement the syntaxes specified in [Syntaxes].
Servers MAY also recognize additional attribute type names. Servers MAY also recognize additional attribute type names.
6.2. Client Implementations 6.2. Client Implementations
Clients which request referrals MUST ensure that they do not loop Clients which request referrals MUST ensure that they do not loop
between servers. They MUST NOT repeatedly contact the same server for between servers. They MUST NOT repeatedly contact the same server for
the same request with the same target entry name, scope and filter. the same request with the same target entry name, scope and filter.
Some clients may be using a counter that is incremented each time Some clients may be using a counter that is incremented each time
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referral handling occurs for an operation, and these kinds of clients referral handling occurs for an operation, and these kinds of clients
MUST be able to handle a DIT with at least ten layers of naming MUST be able to handle a DIT with at least ten layers of naming
contexts between the root and a leaf entry. contexts between the root and a leaf entry.
In the absence of prior agreements with servers, clients SHOULD NOT In the absence of prior agreements with servers, clients SHOULD NOT
assume that servers support any particular schemas beyond those assume that servers support any particular schemas beyond those
referenced in section 6.1. Different schemas can have different referenced in section 6.1. Different schemas can have different
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attribute types with the same names. The client can retrieve the attribute types with the same names. The client can retrieve the
subschema entries referenced by the subschemaSubentry attribute in subschema entries referenced by the subschemaSubentry attribute in
the server's root DSE or in entries held by the server. the server's root DSE or in entries held by the server.
7. Security Considerations 7. Security Considerations
When used with a connection-oriented transport, this version of the When used with a connection-oriented transport, this version of the
protocol provides facilities for simple authentication using a protocol provides facilities for simple authentication using a
cleartext password, as well as any SASL mechanism [RFC2222]. SASL cleartext password, as well as any SASL mechanism [RFC2222]. SASL
allows for integrity and privacy services to be negotiated. allows for integrity and privacy services to be negotiated.
skipping to change at line 1834 skipping to change at line 1838
This document is an update to RFC 2251, by Mark Wahl, Tim Howes, and This document is an update to RFC 2251, by Mark Wahl, Tim Howes, and
Steve Kille. Their work along with the input of individuals of the Steve Kille. Their work along with the input of individuals of the
IETF LDAPEXT, LDUP, LDAPBIS, and other Working Groups is gratefully IETF LDAPEXT, LDUP, LDAPBIS, and other Working Groups is gratefully
acknowledged. acknowledged.
9. Normative References 9. Normative References
[X.500] ITU-T Rec. X.500, "The Directory: Overview of Concepts, [X.500] ITU-T Rec. X.500, "The Directory: Overview of Concepts,
Models and Service", 1993. Models and Service", 1993.
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[Roadmap] K. Zeilenga (editor), "LDAP: Technical Specification Road [Roadmap] K. Zeilenga (editor), "LDAP: Technical Specification Road
Map", draft-ietf-ldapbis-roadmap-xx.txt (a work in Map", draft-ietf-ldapbis-roadmap-xx.txt (a work in
progress). progress).
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997. Requirement Levels", RFC 2119, March 1997.
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[X.680] ITU-T Recommendation X.680 (1997) | ISO/IEC 8824-1:1998 [X.680] ITU-T Recommendation X.680 (1997) | ISO/IEC 8824-1:1998
Information Technology - Abstract Syntax Notation One Information Technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation (ASN.1): Specification of basic notation
[X.690] ITU-T Rec. X.690, "Specification of ASN.1 encoding rules: [X.690] ITU-T Rec. X.690, "Specification of ASN.1 encoding rules:
Basic, Canonical, and Distinguished Encoding Rules", 1994. Basic, Canonical, and Distinguished Encoding Rules", 1994.
[LDAPIANA] K. Zeilenga, "IANA Considerations for LDAP", draft-ietf- [LDAPIANA] K. Zeilenga, "IANA Considerations for LDAP", draft-ietf-
ldapbis-xx.txt (a work in progress). ldapbis-xx.txt (a work in progress).
[ISO10646] Universal Multiple-Octet Coded Character Set (UCS) - [ISO10646] Universal Multiple-Octet Coded Character Set (UCS) -
Architecture and Basic Multilingual Plane, ISO/IEC 10646-1 Architecture and Basic Multilingual Plane, ISO/IEC 10646-1
: 1993. : 1993.
[RFC2044] Yergeau, F., "UTF-8, a transformation format of Unicode [RFC2279] Yergeau, F., "UTF-8, a transformation format of Unicode
and ISO 10646", RFC 2044, October 1996. and ISO 10646", RFC 2279, January 1998.
[Models] K. Zeilenga, "LDAP: The Models", draft-ietf-ldapbis- [Models] K. Zeilenga, "LDAP: The Models", draft-ietf-ldapbis-
models-xx.txt (a work in progress). models-xx.txt (a work in progress).
[LDAPDN] K. Zeilenga (editor), "LDAP: String Representation of [LDAPDN] K. Zeilenga (editor), "LDAP: String Representation of
Distinguished Names", draft-ietf-ldapbis-dn-xx.txt, (a Distinguished Names", draft-ietf-ldapbis-dn-xx.txt, (a
work in progress). work in progress).
[Syntaxes] K. Dally (editor), "LDAP: Syntaxes", draft-ietf-ldapbis- [Syntaxes] K. Dally (editor), "LDAP: Syntaxes", draft-ietf-ldapbis-
syntaxes-xx.txt, (a work in progress). syntaxes-xx.txt, (a work in progress).
skipping to change at line 1890 skipping to change at line 1894
[AuthMeth] R. Harrison (editor), "LDAP: Authentication Methods", [AuthMeth] R. Harrison (editor), "LDAP: Authentication Methods",
draft-ietf-ldapbis-authmeth-xx.txt, (a work in progress). draft-ietf-ldapbis-authmeth-xx.txt, (a work in progress).
[RFC2222] Meyers, J., "Simple Authentication and Security Layer", [RFC2222] Meyers, J., "Simple Authentication and Security Layer",
RFC 2222, October 1997. RFC 2222, October 1997.
10. Editor's Address 10. Editor's Address
Jim Sermersheim Jim Sermersheim
Novell, Inc. Novell, Inc.
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1800 South Novell Place 1800 South Novell Place
Provo, Utah 84606, USA Provo, Utah 84606, USA
jimse@novell.com jimse@novell.com
+1 801 861-3088 +1 801 861-3088
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Appendix A - LDAP Result Codes Appendix A - LDAP Result Codes
This normative appendix details additional considerations regarding This normative appendix details additional considerations regarding
LDAP result codes and provides a brief, general description of each LDAP result codes and provides a brief, general description of each
LDAP result code enumerated in Section 4.1.10. LDAP result code enumerated in Section 4.1.10.
Additional result codes MAY be defined for use with extensions. Additional result codes MAY be defined for use with extensions.
Client implementations SHALL treat any result code which they do not Client implementations SHALL treat any result code which they do not
skipping to change at line 1945 skipping to change at line 1953
- a problem related to an update operation, - a problem related to an update operation,
3) Attribute Errors (codes 16 - 21) 3) Attribute Errors (codes 16 - 21)
- a problem related to a supplied attribute, - a problem related to a supplied attribute,
4) Security Errors (codes 8, 13, 48 - 50) 4) Security Errors (codes 8, 13, 48 - 50)
- a security related problem, - a security related problem,
5) Service Problem (codes 3, 4, 7, 11, 12, 51 - 54, 80) 5) Service Problem (codes 3, 4, 7, 11, 12, 51 - 54, 80)
- a problem related to the provision of the service, and - a problem related to the provision of the service, and
6) Protocol Problem (codes 1, 2) 6) Protocol Problem (codes 1, 2)
- a problem related to protocol structure or semantics. - a problem related to protocol structure or semantics.
Server implementations SHALL NOT continue processing an operation If the server detects multiple errors simultaneously, the server
after it has determined that an error is to be reported. If the SHOULD report the error with the highest precedence.
server detects multiple errors simultaneously, the server SHOULD
report the error with the highest precedence.
Existing LDAP result codes are described as follows: Existing LDAP result codes are described as follows:
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success (0) success (0)
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Indicates successful completion of an operation. Indicates successful completion of an operation.
This result code is normally not returned by the compare This result code is normally not returned by the compare
operation, see compareFalse (5) and compareTrue (6). operation, see compareFalse (5) and compareTrue (6). It is
possible that a future extension mechanism would allow this
to be returned by a compare operation.
operationsError (1) operationsError (1)
Indicates that the operation is not properly sequenced with Indicates that the operation is not properly sequenced with
relation to other operations (of same or different type). relation to other operations (of same or different type).
For example, this code is returned if the client attempts to For example, this code is returned if the client attempts to
Start TLS [RFC2830] while there are other operations Start TLS [RFC2830] while there are other operations
outstanding or if TLS was already established. outstanding or if TLS was already established.
skipping to change at line 2002 skipping to change at line 2010
compareFalse (5) compareFalse (5)
Indicates that the operation successfully completes and the Indicates that the operation successfully completes and the
assertion has evaluated to TRUE. assertion has evaluated to TRUE.
This result code is normally only returned by the compare This result code is normally only returned by the compare
operation. operation.
compareTrue (6) compareTrue (6)
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Indicates that the operation successfully completes and the Indicates that the operation successfully completes and the
assertion has evaluated to FALSE. assertion has evaluated to FALSE.
This result code is normally only returned by the compare This result code is normally only returned by the compare
operation. operation.
authMethodNotSupported (7) authMethodNotSupported (7)
skipping to change at line 2029 skipping to change at line 2037
4.4.1), this indicates that the server requires the client to 4.4.1), this indicates that the server requires the client to
authentication using a strong(er) mechanism. authentication using a strong(er) mechanism.
referral (10) referral (10)
Indicates that a referral needs to be chased to complete the Indicates that a referral needs to be chased to complete the
operation (see section 4.1.11). operation (see section 4.1.11).
adminLimitExceeded (11) adminLimitExceeded (11)
Indicates that an admnistrative limit has been exceeded. Indicates that an administrative limit has been exceeded.
unavailableCriticalExtension (12) unavailableCriticalExtension (12)
Indicates that server cannot perform a critical extension Indicates that server cannot perform a critical extension
(see section 4.1.12). (see section 4.1.12).
confidentialityRequired (13) confidentialityRequired (13)
Indicates that data confidentiality protections are required. Indicates that data confidentiality protections are required.
saslBindInProgress (14) saslBindInProgress (14)
Indicates the server requires the client to send a new bind Indicates the server requires the client to send a new bind
request, with the same sasl mechanism, to continue the request, with the same SASL mechanism, to continue the
authentication process (see section 4.2). authentication process (see section 4.2).
noSuchAttribute (16) noSuchAttribute (16)
Indicates that the named entry does not contain the specified Indicates that the named entry does not contain the specified
attribute or attribute value. attribute or attribute value.
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undefinedAttributeType (17) undefinedAttributeType (17)
Indicates that a request field contains an undefined Indicates that a request field contains an undefined
attribute type. attribute type.
inappropriateMatching (18) inappropriateMatching (18)
Indicates that a request cannot be completed due to an Indicates that a request cannot be completed due to an
skipping to change at line 2090 skipping to change at line 2098
Indicates that a purported attribute value does not conform Indicates that a purported attribute value does not conform
to the syntax of the attribute. to the syntax of the attribute.
noSuchObject (32) noSuchObject (32)
Indicates that the object does not exist in the DIT. Indicates that the object does not exist in the DIT.
aliasProblem (33) aliasProblem (33)
Indicates that an alias problem has occurred. Indicates that an alias problem has occurred. Typically an
alias has been dereferenced which names no object.
invalidDNSyntax (34) invalidDNSyntax (34)
Indicates that a LDAPDN or RelativeLDAPDN field (e.g. search Indicates that a LDAPDN or RelativeLDAPDN field (e.g. search
base, target entry, ModifyDN newrdn, etc.) of a request does base, target entry, ModifyDN newrdn, etc.) of a request does
not conform to the required syntax or contains attribute not conform to the required syntax or contains attribute
values which do not conform to the syntax of the attribute's values which do not conform to the syntax of the attribute's
type. type.
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aliasDereferencingProblem (36) aliasDereferencingProblem (36)
Indicates that a problem in dereferencing an alias. Indicates that a problem occurred while dereferencing an
alias. Typically an alias was encountered in a situation
where it was not allowed or where access was denied.
inappropriateAuthentication (48) inappropriateAuthentication (48)
Indicates the server requires the client which had attempted Indicates the server requires the client which had attempted
to bind anonymously or without supplying credentials to to bind anonymously or without supplying credentials to
provide some form of credentials, provide some form of credentials,
invalidCredentials (49) invalidCredentials (49)
Indicates the supplied credentials are invalid. Indicates the supplied credentials are invalid.
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loopDetect (54) loopDetect (54)
Indicates that the server has detected an internal loop. Indicates that the server has detected an internal loop.
namingViolation (64) namingViolation (64)
Indicates that the entry name violates naming restrictions. Indicates that the entry name violates naming restrictions.
objectClassViolation (65) objectClassViolation (65)
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Indicates that the entry violates object class restrictions.
notAllowedOnNonLeaf (66) notAllowedOnNonLeaf (66)
Indicates that operation is inappropriately acting upon a Indicates that operation is inappropriately acting upon a
non-leaf entry. non-leaf entry.
notAllowedOnRDN (67) notAllowedOnRDN (67)
Indicates that the operation is inappropriately attempting to Indicates that the operation is inappropriately attempting to
remove a value which forms the entry's relative distinguished remove a value which forms the entry's relative distinguished
name. name.
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affectsMultipleDSAs (71) affectsMultipleDSAs (71)
Indicates that the operation cannot be completed as it Indicates that the operation cannot be completed as it
affects multiple servers (DSAs). affects multiple servers (DSAs).
other (80) other (80)
Indicates the server has encountered an internal error. Indicates the server has encountered an internal error.
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Appendix B - Complete ASN.1 Definition Appendix B - Complete ASN.1 Definition
This appendix is normative. This appendix is normative.
Lightweight-Directory-Access-Protocol-V3 DEFINITIONS Lightweight-Directory-Access-Protocol-V3 DEFINITIONS
IMPLICIT TAGS IMPLICIT TAGS
EXTENSIBILITY IMPLIED ::= EXTENSIBILITY IMPLIED ::=
skipping to change at line 2242 skipping to change at line 2253
LDAPDN ::= LDAPString LDAPDN ::= LDAPString
RelativeLDAPDN ::= LDAPString RelativeLDAPDN ::= LDAPString
AttributeDescription ::= LDAPString AttributeDescription ::= LDAPString
-- Constrained to attributedescription -- Constrained to attributedescription
-- [Models] -- [Models]
AttributeDescriptionList ::= SEQUENCE OF AttributeDescriptionList ::= SEQUENCE OF
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AttributeDescription AttributeDescription
AttributeValue ::= OCTET STRING AttributeValue ::= OCTET STRING
AttributeValueAssertion ::= SEQUENCE { AttributeValueAssertion ::= SEQUENCE {
attributeDesc AttributeDescription, attributeDesc AttributeDescription,
assertionValue AssertionValue } assertionValue AssertionValue }
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-- 37-47 unused -- -- 37-47 unused --
inappropriateAuthentication (48), inappropriateAuthentication (48),
invalidCredentials (49), invalidCredentials (49),
insufficientAccessRights (50), insufficientAccessRights (50),
busy (51), busy (51),
unavailable (52), unavailable (52),
unwillingToPerform (53), unwillingToPerform (53),
loopDetect (54), loopDetect (54),
-- 55-63 unused -- -- 55-63 unused --
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namingViolation (64), namingViolation (64),
objectClassViolation (65), objectClassViolation (65),
notAllowedOnNonLeaf (66), notAllowedOnNonLeaf (66),
notAllowedOnRDN (67), notAllowedOnRDN (67),
entryAlreadyExists (68), entryAlreadyExists (68),
objectClassModsProhibited (69), objectClassModsProhibited (69),
-- 70 reserved for CLDAP -- -- 70 reserved for CLDAP --
affectsMultipleDSAs (71), affectsMultipleDSAs (71),
-- 72-79 unused -- -- 72-79 unused --
other (80), other (80),
... }, ... },
-- 81-90 reserved for APIs -- -- 81-90 reserved for APIs --
matchedDN LDAPDN, matchedDN LDAPDN,
errorMessage LDAPString, diagnosticMessage LDAPString,
referral [3] Referral OPTIONAL } referral [3] Referral OPTIONAL }
Referral ::= SEQUENCE OF LDAPURL Referral ::= SEQUENCE OF LDAPURL
LDAPURL ::= LDAPString -- limited to characters permitted in LDAPURL ::= LDAPString -- limited to characters permitted in
-- URLs -- URLs
Controls ::= SEQUENCE OF Control Controls ::= SEQUENCE OF Control
Control ::= SEQUENCE { Control ::= SEQUENCE {
skipping to change at line 2358 skipping to change at line 2369
serverSaslCreds [7] OCTET STRING OPTIONAL } serverSaslCreds [7] OCTET STRING OPTIONAL }
UnbindRequest ::= [APPLICATION 2] NULL UnbindRequest ::= [APPLICATION 2] NULL
SearchRequest ::= [APPLICATION 3] SEQUENCE { SearchRequest ::= [APPLICATION 3] SEQUENCE {
baseObject LDAPDN, baseObject LDAPDN,
scope ENUMERATED { scope ENUMERATED {
baseObject (0), baseObject (0),
singleLevel (1), singleLevel (1),
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wholeSubtree (2) }, wholeSubtree (2) },
derefAliases ENUMERATED { derefAliases ENUMERATED {
neverDerefAliases (0), neverDerefAliases (0),
derefInSearching (1), derefInSearching (1),
derefFindingBaseObj (2), derefFindingBaseObj (2),
derefAlways (3) }, derefAlways (3) },
sizeLimit INTEGER (0 .. maxInt), sizeLimit INTEGER (0 .. maxInt),
timeLimit INTEGER (0 .. maxInt), timeLimit INTEGER (0 .. maxInt),
skipping to change at line 2416 skipping to change at line 2427
vals SET OF AttributeValue } vals SET OF AttributeValue }
SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL
SearchResultDone ::= [APPLICATION 5] LDAPResult SearchResultDone ::= [APPLICATION 5] LDAPResult
ModifyRequest ::= [APPLICATION 6] SEQUENCE { ModifyRequest ::= [APPLICATION 6] SEQUENCE {
object LDAPDN, object LDAPDN,
modification SEQUENCE OF SEQUENCE { modification SEQUENCE OF SEQUENCE {
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operation ENUMERATED { operation ENUMERATED {
add (0), add (0),
delete (1), delete (1),
replace (2) }, replace (2) },
modification AttributeTypeAndValues } } modification AttributeTypeAndValues } }
AttributeTypeAndValues ::= SEQUENCE { AttributeTypeAndValues ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
skipping to change at line 2472 skipping to change at line 2483
requestName [0] LDAPOID, requestName [0] LDAPOID,
requestValue [1] OCTET STRING OPTIONAL } requestValue [1] OCTET STRING OPTIONAL }
ExtendedResponse ::= [APPLICATION 24] SEQUENCE { ExtendedResponse ::= [APPLICATION 24] SEQUENCE {
COMPONENTS OF LDAPResult, COMPONENTS OF LDAPResult,
responseName [10] LDAPOID OPTIONAL, responseName [10] LDAPOID OPTIONAL,
response [11] OCTET STRING OPTIONAL } response [11] OCTET STRING OPTIONAL }
END END
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Appendix C - Change History Appendix C - Change History
<Note to RFC editor: This section is to be removed prior to RFC <Note to RFC editor: This section is to be removed prior to RFC
publication> publication>
C.1 Changes made to RFC 2251: C.1 Changes made to RFC 2251:
C.1.1 Editorial C.1.1 Editorial
skipping to change at line 2529 skipping to change at line 2540
the transfer encoding is present in attributeDesc, the the transfer encoding is present in attributeDesc, the
AssertionValue is encoded as specified by the option...". AssertionValue is encoded as specified by the option...".
Previously, only the ;binary option was mentioned. Previously, only the ;binary option was mentioned.
C.2.3 Sections 4.2, 4.9, 4.10 C.2.3 Sections 4.2, 4.9, 4.10
- Added alias dereferencing specifications. In the case of modDN, - Added alias dereferencing specifications. In the case of modDN,
followed precedent set on other update operations (... alias is followed precedent set on other update operations (... alias is
not dereferenced...) In the case of bind and compare stated that not dereferenced...) In the case of bind and compare stated that
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servers SHOULD NOT dereference aliases. Specifications were added servers SHOULD NOT dereference aliases. Specifications were added
because they were missing from the previous version and caused because they were missing from the previous version and caused
interoperability problems. Concessions were made for bind and interoperability problems. Concessions were made for bind and
compare (neither should have ever allowed alias dereferencing) by compare (neither should have ever allowed alias dereferencing) by
using SHOULD NOT language, due to the behavior of some existing using SHOULD NOT language, due to the behavior of some existing
implementations. implementations.
C.2.4 Sections 4.5 and Appendix A C.2.4 Sections 4.5 and Appendix A
skipping to change at line 2585 skipping to change at line 2596
by a lower layer" to "the underlying transport service cannot by a lower layer" to "the underlying transport service cannot
guarantee confidentiality" guarantee confidentiality"
C.3.6 Section 4.5.2 C.3.6 Section 4.5.2
- Removed all mention of ExtendedResponse due to lack of - Removed all mention of ExtendedResponse due to lack of
implementation. implementation.
C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt: C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt:
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C.4.1 Section 4 C.4.1 Section 4
- Removed "typically" from "and is typically transferred" in the - Removed "typically" from "and is typically transferred" in the
first paragraph. We know of no (and can conceive of no) case where first paragraph. We know of no (and can conceive of no) case where
this isn't true. this isn't true.
- Added "Section 5.1 specifies how the LDAP protocol is encoded." To - Added "Section 5.1 specifies how the LDAP protocol is encoded." To
the first paragraph. Added this cross reference for readability. the first paragraph. Added this cross reference for readability.
- Changed "version 3 " to "version 3 or later" in the second - Changed "version 3 " to "version 3 or later" in the second
skipping to change at line 2641 skipping to change at line 2652
controls). controls).
C.4.6 Section 4.4 C.4.6 Section 4.4
- Changed "One unsolicited notification is defined" to "One - Changed "One unsolicited notification is defined" to "One
unsolicited notification (Notice of Disconnection) is defined" in unsolicited notification (Notice of Disconnection) is defined" in
the third paragraph. For clarity and readability. the third paragraph. For clarity and readability.
C.4.7 Section 4.5.1 C.4.7 Section 4.5.1
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- Changed "checking for the existence of the objectClass attribute" - Changed "checking for the existence of the objectClass attribute"
to "checking for the presence of the objectClass attribute" in the to "checking for the presence of the objectClass attribute" in the
last paragraph. This was done as a measure of consistency (we use last paragraph. This was done as a measure of consistency (we use
the terms present and presence rather than exists and existence in the terms present and presence rather than exists and existence in
search filters). search filters).
C.4.8 Section 4.5.3 C.4.8 Section 4.5.3
skipping to change at line 2697 skipping to change at line 2708
whether there can be more than one value of an attribute of that whether there can be more than one value of an attribute of that
type in an entry, the syntax to which the values must conform, the type in an entry, the syntax to which the values must conform, the
kinds of matching which can be performed on values of that kinds of matching which can be performed on values of that
attribute, and other functions." to " An attribute is a attribute, and other functions." to " An attribute is a
description (a type and zero or more options) with one or more description (a type and zero or more options) with one or more
associated values. The attribute type governs whether the associated values. The attribute type governs whether the
attribute can have multiple values, the syntax and matching rules attribute can have multiple values, the syntax and matching rules
used to construct and compare values of that attribute, and other used to construct and compare values of that attribute, and other
functions. Options indicate modes of transfer and other functions. Options indicate modes of transfer and other
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functions.". This points out that an attribute consists of both functions.". This points out that an attribute consists of both
the type and options. the type and options.
C.5.2 Section 4 C.5.2 Section 4
- Changed "Section 5.1 specifies the encoding rules for the LDAP - Changed "Section 5.1 specifies the encoding rules for the LDAP
protocol" to "Section 5.1 specifies how the protocol is encoded protocol" to "Section 5.1 specifies how the protocol is encoded
and transferred." and transferred."
skipping to change at line 2754 skipping to change at line 2765
- Changed the wording regarding 'equally capable' referrals to "If - Changed the wording regarding 'equally capable' referrals to "If
multiple URLs are present, the client assumes that any URL may be multiple URLs are present, the client assumes that any URL may be
used to progress the operation.". The previous language implied used to progress the operation.". The previous language implied
that the server MUST enforce rules that it was practically that the server MUST enforce rules that it was practically
incapable of. The new language highlights the original intent-- incapable of. The new language highlights the original intent--
that is, that any of the referrals may be used to progress the that is, that any of the referrals may be used to progress the
operation, there is no inherent 'weighting' mechanism. operation, there is no inherent 'weighting' mechanism.
C.5.7 Section 4.5.1 and Appendix A C.5.7 Section 4.5.1 and Appendix A
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- Added the comment "-- initial and final can occur at most once", - Added the comment "-- initial and final can occur at most once",
to clarify this restriction. to clarify this restriction.
C.5.8 Section 5.1 C.5.8 Section 5.1
- Changed heading from "Mapping Onto BER-based Transport Services" - Changed heading from "Mapping Onto BER-based Transport Services"
to "Protocol Encoding". to "Protocol Encoding".
skipping to change at line 2810 skipping to change at line 2821
doc now specifies a difference between transfer and tagging doc now specifies a difference between transfer and tagging
options and describes the semantics of each, and how and when options and describes the semantics of each, and how and when
subtyping rules apply. Now allow options to be transmitted in any subtyping rules apply. Now allow options to be transmitted in any
order but disallow any ordering semantics to be implied. These order but disallow any ordering semantics to be implied. These
changes are the result of ongoing input from an engineering team changes are the result of ongoing input from an engineering team
designed to deal with ambiguity issues surrounding attribute designed to deal with ambiguity issues surrounding attribute
options. options.
C.7.3 Sections 4.1.5.1 and 4.1.6 C.7.3 Sections 4.1.5.1 and 4.1.6
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- Refer to non "binary" transfer encodings as "native encoding" - Refer to non "binary" transfer encodings as "native encoding"
rather than "string" encoding to clarify and avoid confusion. rather than "string" encoding to clarify and avoid confusion.
C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt: C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt:
C.8.1 Title C.8.1 Title
- Changed to "LDAP: The Protocol" to be consisted with other working - Changed to "LDAP: The Protocol" to be consisted with other working
skipping to change at line 2866 skipping to change at line 2877
C.8.7 Relationship to X.500 C.8.7 Relationship to X.500
- Removed section. It has been moved to [Roadmap] - Removed section. It has been moved to [Roadmap]
C.8.8 Server Specific Data Requirements C.8.8 Server Specific Data Requirements
- Removed section. It has been moved to [Models] - Removed section. It has been moved to [Models]
C.8.9 Elements of Protocol C.8.9 Elements of Protocol
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- Added "Section 5.1 specifies how the protocol is encoded and - Added "Section 5.1 specifies how the protocol is encoded and
transferred." to the end of the first paragraph for reference. transferred." to the end of the first paragraph for reference.
- Reworded notes about extensibility, and now talk about implied - Reworded notes about extensibility, and now talk about implied
extensibility and the use of ellipses in the ASN.1 extensibility and the use of ellipses in the ASN.1
- Removed references to LDAPv2 in third and fourth paragraphs. - Removed references to LDAPv2 in third and fourth paragraphs.
skipping to change at line 2923 skipping to change at line 2934
- Clarified intent regarding exactly what is to be BER encoded. - Clarified intent regarding exactly what is to be BER encoded.
- Clarified that clients must not expect ;binary when not asking for - Clarified that clients must not expect ;binary when not asking for
it (;binary, as opposed to ber encoded data). it (;binary, as opposed to ber encoded data).
C.8.17 Attribute C.8.17 Attribute
- Use the term "attribute description" in lieu of "type" - Use the term "attribute description" in lieu of "type"
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- Clarified the fact that clients cannot rely on any apparent - Clarified the fact that clients cannot rely on any apparent
ordering of attribute values. ordering of attribute values.
C.8.18 LDAPResult C.8.18 LDAPResult
- To resultCode, added ellipses "..." to the enumeration to indicate - To resultCode, added ellipses "..." to the enumeration to indicate
extensibility. and added a note, pointing to [LDAPIANA] extensibility. and added a note, pointing to [LDAPIANA]
skipping to change at line 2980 skipping to change at line 2991
- Added as normative appendix A - Added as normative appendix A
C.8.25 ASN.1 C.8.25 ASN.1
- Added EXTENSIBILITY IMPLIED - Added EXTENSIBILITY IMPLIED
- Added a number of comments holding referenced to [Models] and - Added a number of comments holding referenced to [Models] and
[ISO10646]. [ISO10646].
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- Removed AttributeType. It is not used. - Removed AttributeType. It is not used.
C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt: C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt:
- Removed all mention of transfer encodings and the binary attribute - Removed all mention of transfer encodings and the binary attribute
option option
- Further alignment with [Models]. - Further alignment with [Models].
skipping to change at line 3005 skipping to change at line 3016
malformed PDUs malformed PDUs
- Specified which matching rules and syntaxes are used for various - Specified which matching rules and syntaxes are used for various
filter items filter items
C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt: C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt:
C.10.1 Section 4.1.1.1: C.10.1 Section 4.1.1.1:
- Clarified when it is and isn't appropriate to return an already - Clarified when it is and isn't appropriate to return an already
used result code. used message id.
C.10.2 Section 4.1.11: C.10.2 Section 4.1.11:
- Clarified that a control only applies to the message it's attached - Clarified that a control only applies to the message it's attached
to. to.
- Explained that the criticality field is only applicable to certain - Explained that the criticality field is only applicable to certain
request messages. request messages.
- Added language regarding the combination of controls. - Added language regarding the combination of controls.
skipping to change at line 3033 skipping to change at line 3044
C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt: C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt:
- Fixed formatting - Fixed formatting
C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt: C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt:
C.12.1 Section 4.1.4: C.12.1 Section 4.1.4:
- Removed second paragraph as this language exists in MODELS - Removed second paragraph as this language exists in MODELS
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C.12.2 Section 4.2.1: C.12.2 Section 4.2.1:
- Replaced fourth paragraph. It was accidentally removed in an - Replaced fourth paragraph. It was accidentally removed in an
earlier edit. earlier edit.
C.12.2 Section 4.13: C.12.2 Section 4.13:
- Added section describing the StartTLS operation (moved from - Added section describing the StartTLS operation (moved from
authmeth) authmeth)
C.13 Changes made to draft-ietf-ldapbis-protocol-11.txt:
C.13.1 Section 4.1.9
- Changed "errorMessage" to "diagnosticMessage". Simply to indicate
that the field may be non-empty even if a non-error resultCode is
present.
C.13.2 Section 4.2:
- Reconciled language in "name" definition with [AuthMeth]
C.13.3 Section 4.2.1
- Renamed to "Processing of the Bind Request", and moved some text
from 4.2 into this section.
- Rearranged paragraphs to flow better.
- Specified that (as well as failed) an abandoned bind operation
will leave the connection in an anonymous state.
C.13.4 Section 4.5.3
- Generalized the second paragraph which cited indexing and
searchreferralreferences.
Appendix D - Outstanding Work Items Appendix D - Outstanding Work Items
D.0 Integrate notational consistency agreements D.0 General
- WG will discuss notation consistency. Once agreement happens, - Integrate notational consistency agreements WG will discuss
reconcile draft. notation consistency. Once agreement happens, reconcile draft.
D.1 Integrate result codes draft. - Reconcile problems with [Models]. Section 3.2 was wholly removed.
There were some protocol semantics in that section that need to be
brought back. Specifically, there was the notion of the server
implicitly adding objectclass superclasses when a value is added.
- The result codes draft should be reconciled with this draft. D.1 Make result code usage consistent.
Operation-specific instructions will reside with operations while
the error-specific sections will be added as an appendix. Note - While there is a result code appendix, ensure it speaks of result
that there is a result codes appendix now. Still need to reconcile codes in a general sense, and only highlight specific result codes
with each operation.
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in the context of an operation when that operation ties more
specific meanings to that result code.
D.2 Verify references. D.2 Verify references.
- Many referenced documents have changed. Ensure references and - Many referenced documents have changed. Ensure references and
section numbers are correct. section numbers are correct.
D.3 Usage of Naming Context D.3 Usage of Naming Context
- Make sure occurrences of "namingcontext" and "naming context" are - Make sure occurrences of "namingcontext" and "naming context" are
consistent with [Models]. consistent with [Models]. Use in section 6.2 should be reworked.
It's layers of indirection that matter, not number of contexts.
(That is, referrals can be returned for a number of reasons (cross
reference, superior, subordinate, busy, not master, etc.)
D.14 Section 4.1.12 Other uses are fine.
- Specify whether or not servers are to advertise the OIDs of known D.4 Review 2119 usage
response controls.
D.5 Reconcile with I-D Nits
D.18 Section 4.2.3 D.18 Section 4.2.3
- Change "operationsError" to "other" as a bind result code. - Change "operationsError" to "other" as a bind result code.
Proposal is to remove it since it's a general error anyway.
D.21 Section 4.5.1
- Make sure the use of "subordinates" in the derefInSearching
definition is correct. See "derefInSearching" on list.
D.23 Section 4.5.3 D.23 Section 4.5.3
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this case it would return a SearchResultDone containing a referral
resultCode.
- Add "Similarly, a server MUST NOT return a SearchResultReference - Add "Similarly, a server MUST NOT return a SearchResultReference
when the scope of the search is baseObject. If a client receives when the scope of the search is baseObject. If a client receives
such a SearchResultReference it MUST interpret is as a protocol such a SearchResultReference it MUST interpret is as a protocol
error and MUST NOT follow it." to the first paragraph. error and MUST NOT follow it." to the first paragraph.
The technical specification doesn't have to describe how a
protocol peer should react when its partner violates an absolute.
OR return noSuchObject.
- Add "If the scope part of the LDAP URL is present, the client MUST - Add "If the scope part of the LDAP URL is present, the client MUST
use the new scope in its next request to progress the search. If use the new scope in its next request to progress the search. If
the scope part is absent the client MUST use subtree scope to the scope part is absent the client MUST use subtree scope to
complete subtree searches and base scope to complete one level complete subtree searches and base scope to complete one level
searches." to the third paragraph. searches." to the third paragraph.
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D.25 Section 4.6 D.25 Section 4.6
- Resolve the meaning of "and is ignored if the attribute does not - Resolve the meaning of "and is ignored if the attribute does not
exist". See "modify: "non-existent attribute"" on the list. exist". See "modify: "non-existent attribute"" on the list. Not
sure if there's really an issue here. Will look at archive
D.27 Section 4.10 D.27 Section 4.10
- Specify what happens when the attr is missing vs. attr isn't in - Specify what happens when the attr is missing vs. attr isn't in
schema. Also what happens if there's no equality matching rule. schema. Also what happens if there's no equality matching rule.
noSuchAttribute, undefinedAttributeType, inappropriateMatching
D.30 Section 5.1 D.30 Section 5.1
- Add "control and extended operation values" to last paragraph. See - Add "control and extended operation values" to last paragraph. See
"LBER (BER Restrictions)" on list. "LBER (BER Restrictions)" on list.
D.32 Section 6.1 D.32 Section 6.1
- Add "that are used by those attributes" to the first paragraph. - Add "that are used by those attributes" to the first paragraph.
- Add "Servers which support update operations MUST, and other - Add "Servers which support update operations MUST, and other
servers SHOULD, support strong authentication mechanisms described servers SHOULD, support strong authentication mechanisms described
in [RFC2829]." as a second paragraph. in [RFC2829]." as a second paragraph. Likely should just say
Requirements of authentication methods, SASL mechanisms, and TLS
are described in [AUTHMETH]." (also apply to next two below)
- Add "Servers which provide access to sensitive information MUST, - Add "Servers which provide access to sensitive information MUST,
and other servers SHOULD support privacy protections such as those and other servers SHOULD support privacy protections such as those
described in [RFC2829] and [RFC2830]." as a third paragraph. described in [RFC2829] and [RFC2830]." as a third paragraph.
D.33 Section 7 D.33 Section 7
- Add "Servers which support update operations MUST, and other - Add "Servers which support update operations MUST, and other
servers SHOULD, support strong authentication mechanisms described servers SHOULD, support strong authentication mechanisms described
in [RFC2829]." as a fourth paragraph. in [RFC2829]." as a fourth paragraph.
- Add "In order to automatically follow referrals, clients may need - Add "In order to automatically follow referrals, clients may need
to hold authentication secrets. This poses significant privacy and to hold authentication secrets. This poses significant privacy and
security concerns and SHOULD be avoided." as a sixth paragraph. security concerns and SHOULD be avoided." as a sixth paragraph.
- Add "This document provides a mechanism which clients may use to There are concerns with "automatic" chasing regardless of which,
discover operational attributes. Those relying on security by if any, authentication method/mechanism is used.
obscurity should implement appropriate access controls to
restricts access to operational attributes per local policy." as
an eighth paragraph.
- Add "This document provides a mechanism which clients may use to
discover operational attributes. Those relying on security by
obscurity should implement appropriate access controls to
restricts access to operational attributes per local policy." as
an eighth paragraph.
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- Add notes regarding DoS attack found by CERT advisories. - Add notes regarding DoS attack found by CERT advisories.
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- C.9. Explain why we removed ;binary, and what clients can do to
get around potential problems (likely refer to an I-D)
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Full Copyright Statement Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved. Copyright (C) The Internet Society (2002). All Rights Reserved.
This document and translations of it may be copied and furnished to This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any and distributed, in whole or in part, without restriction of any
skipping to change at line 3180 skipping to change at line 3233
The limited permissions granted above are perpetual and will not be The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns. revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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 End of changes. 

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