draft-ietf-ldapbis-protocol-27.txt   draft-ietf-ldapbis-protocol-28.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-27.txt Oct 2004 Document: draft-ietf-ldapbis-protocol-28.txt Nov 2004
Obsoletes: RFCs 2251, 2830, 3771 Obsoletes: RFCs 2251, 2830, 3771
LDAP: The Protocol LDAP: The Protocol
Status of this Memo Status of this Memo
This document is an Internet-Draft and is subject to all provisions This document is an Internet-Draft and is subject to all provisions
of section 3 of RFC 3667. By submitting this Internet-Draft, each of section 3 of RFC 3667. By submitting this Internet-Draft, each
author represents that any applicable patent or other IPR claims of author represents that any applicable patent or other IPR claims of
which he or she is aware have been or will be disclosed, and any of which he or she is aware have been or will be disclosed, and any of
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1. Introduction....................................................3 1. Introduction....................................................3
1.1. Relationship to Obsolete Specifications.......................3 1.1. Relationship to Obsolete Specifications.......................3
2. Conventions.....................................................3 2. Conventions.....................................................3
3. Protocol Model..................................................4 3. Protocol Model..................................................4
3.1 Operation and LDAP Exchange Relationship.......................4 3.1 Operation and LDAP Exchange Relationship.......................4
4. Elements of Protocol............................................5 4. Elements of Protocol............................................5
4.1. Common Elements...............................................5 4.1. Common Elements...............................................5
4.1.1. Message Envelope............................................5 4.1.1. Message Envelope............................................5
4.1.2. String Types................................................7 4.1.2. String Types................................................7
4.1.3. Distinguished Name and Relative Distinguished Name..........7 4.1.3. Distinguished Name and Relative Distinguished Name..........7
4.1.4. Attribute Descriptions......................................7 4.1.4. Attribute Descriptions......................................8
4.1.5. Attribute Value.............................................8 4.1.5. Attribute Value.............................................8
4.1.6. Attribute Value Assertion...................................8 4.1.6. Attribute Value Assertion...................................8
4.1.7. Attribute and PartialAttribute..............................9 4.1.7. Attribute and PartialAttribute..............................9
4.1.8. Matching Rule Identifier....................................9 4.1.8. Matching Rule Identifier....................................9
4.1.9. Result Message..............................................9 4.1.9. Result Message..............................................9
4.1.10. Referral..................................................11 4.1.10. Referral..................................................11
4.1.11. Controls..................................................12 4.1.11. Controls..................................................12
4.2. Bind Operation...............................................14 4.2. Bind Operation...............................................14
4.3. Unbind Operation.............................................17 4.3. Unbind Operation.............................................17
4.4. Unsolicited Notification.....................................17 4.4. Unsolicited Notification.....................................17
4.5. Search Operation.............................................18 4.5. Search Operation.............................................18
4.6. Modify Operation.............................................27 4.6. Modify Operation.............................................28
4.7. Add Operation................................................28 4.7. Add Operation................................................29
4.8. Delete Operation.............................................29 4.8. Delete Operation.............................................30
4.9. Modify DN Operation..........................................30 4.9. Modify DN Operation..........................................31
4.10. Compare Operation...........................................31 4.10. Compare Operation...........................................32
4.11. Abandon Operation...........................................32 4.11. Abandon Operation...........................................33
4.12. Extended Operation..........................................32 4.12. Extended Operation..........................................34
4.13. IntermediateResponse Message................................34 4.13. IntermediateResponse Message................................35
4.13.1. Usage with LDAP ExtendedRequest and ExtendedResponse......34 4.13.1. Usage with LDAP ExtendedRequest and ExtendedResponse......36
4.13.2. Usage with LDAP Request Controls..........................35 4.13.2. Usage with LDAP Request Controls..........................36
4.14. StartTLS Operation..........................................35 4.14. StartTLS Operation..........................................36
5. Protocol Encoding, Connection, and Transfer....................37 5. Protocol Encoding, Connection, and Transfer....................38
5.2. Protocol Encoding............................................37 5.2. Protocol Encoding............................................39
5.3. Transmission Control Protocol (TCP)..........................38 5.3. Transmission Control Protocol (TCP)..........................39
6. Security Considerations........................................38 6. Security Considerations........................................39
7. Acknowledgements...............................................39 7. Acknowledgements...............................................41
8. Normative References...........................................40 8. Normative References...........................................41
9. Informative References.........................................41 9. Informative References.........................................43
10. IANA Considerations...........................................42 10. IANA Considerations...........................................43
11. Editor's Address..............................................42 11. Editor's Address..............................................43
Appendix A - LDAP Result Codes....................................43 Appendix A - LDAP Result Codes....................................44
A.1 Non-Error Result Codes........................................43 A.1 Non-Error Result Codes........................................44
A.2 Result Codes..................................................43 A.2 Result Codes..................................................44
Appendix B - Complete ASN.1 Definition............................48 Appendix B - Complete ASN.1 Definition............................49
Appendix C - Changes..............................................54 Appendix C - Changes..............................................55
C.1 Changes made to RFC 2251:.....................................54 C.1 Changes made to RFC 2251:.....................................55
C.2 Changes made to RFC 2830:.....................................59 C.2 Changes made to RFC 2830:.....................................60
C.3 Changes made to RFC 3771:.....................................59 C.3 Changes made to RFC 3771:.....................................61
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
1. Introduction 1. Introduction
The Directory is "a collection of open systems cooperating to provide The Directory is "a collection of open systems cooperating to provide
directory services" [X.500]. A directory user, which may be a human 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 the Lightweight This document details the protocol elements of the Lightweight
Directory Access Protocol (LDAP), along with their semantics. Directory Access Protocol (LDAP), along with their semantics.
Following the description of protocol elements, it describes the way Following the description of protocol elements, it describes the way
in which the protocol elements are encoded and transferred. in which the protocol elements are encoded and transferred.
1.1. Relationship to Obsolete Specifications 1.1. Relationship to Other LDAP Specifications
This document is an integral part of the LDAP Technical Specification This document is an integral part of the LDAP Technical Specification
[Roadmap] which obsoletes the previously defined LDAP technical [Roadmap] which obsoletes the previously defined LDAP technical
specification, RFC 3377, in its entirety. specification, RFC 3377, in its entirety.
This document obsoletes all of RFC 2251 except the following: This document obsoletes all of RFC 2251 except the following:
Sections 3.2, 3.4, 4.1.3 (last paragraph), 4.1.4, 4.1.5, 4.1.5.1, Sections 3.2, 3.4, 4.1.3 (last paragraph), 4.1.4, 4.1.5, 4.1.5.1,
4.1.9 (last paragraph), 5.1, 6.1, and 6.2 (last paragraph) are 4.1.9 (last paragraph), 5.1, 6.1, and 6.2 (last paragraph) are
obsoleted by [Models]. obsoleted by [Models].
Section 3.3 is obsoleted by [Roadmap]. Section 3.3 is obsoleted by [Roadmap].
skipping to change at line 162 skipping to change at line 162
Character names in this document use the notation for code points and Character names in this document use the notation for code points and
names from the Unicode Standard [Unicode]. For example, the letter names from the Unicode Standard [Unicode]. For example, the letter
"a" may be represented as either <U+0061> or <LATIN SMALL LETTER A>. "a" may be represented as either <U+0061> or <LATIN SMALL LETTER A>.
Note: a glossary of terms used in Unicode can be found in [Glossary]. Note: a glossary of terms used in Unicode can be found in [Glossary].
Information on the Unicode character encoding model can be found in Information on the Unicode character encoding model can be found in
[CharModel]. [CharModel].
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
The term "connection" refers to the underlying transport service used The term "transport connection" refers to the underlying transport
to carry the protocol exchange. services used to carry the protocol exchange, as well as associations
established by these services.
The term "LDAP exchange" refers to the layer where LDAP PDUs are The term "TLS layer" refers to TLS services used in providing
exchanged between protocol peers. security services, as well as associations established by these
services.
The term "TLS layer" refers to a layer inserted between the The term "SASL layer" refers to SASL services used in providing
connection and the LDAP exchange that utilizes Transport Layer security services, as well as associations established by these
Security ([TLS]) to protect the exchange of LDAP PDUs. services.
The term "SASL layer" refers to a layer inserted between the The term "LDAP message layer" refers to the LDAP Message (PDU)
connection and the LDAP exchange that utilizes Simple Authentication services used in providing directory services, as well as
and Security Layer ([SASL]) to protect the exchange of LDAP PDUs. associations established by these services.
The term "LDAP session" refers to combined services (transport
connection, TLS layer, SASL layer, LDAP message layer) and their
associations.
See the table in Section 5 for an illustration of these four terms. See the table in Section 5 for an illustration of these four terms.
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 an the necessary operation(s) in the Directory. Upon completion of an
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exchanged between a client and server in any order. If required, exchanged between a client and server in any order. If required,
synchronous behavior may be controlled by client applications. synchronous behavior may be controlled by client applications.
The core protocol operations defined in this document can be mapped The core protocol operations defined in this document can be mapped
to a subset of the X.500 (1993) Directory Abstract Service [X.511]. to a subset of the X.500 (1993) Directory Abstract Service [X.511].
However there is not a one-to-one mapping between LDAP operations and However there is not a one-to-one mapping between LDAP operations and
X.500 Directory Access Protocol (DAP) operations. Server X.500 Directory Access Protocol (DAP) operations. Server
implementations acting as a gateway to X.500 directories may need to implementations acting as a gateway to X.500 directories may need to
make multiple DAP requests to service a single LDAP request. make multiple DAP requests to service a single LDAP request.
3.1 Operation and LDAP Exchange Relationship 3.1 Operation and LDAP Message Layer Relationship
Protocol operations are tied to an LDAP exchange. When the connection
is closed, any uncompleted operations tied to the LDAP exchange are,
when possible, abandoned, and when not possible, completed without
transmission of the response. Also, when the connection is closed,
the client MUST NOT assume that any uncompleted update operations
tied to the LDAP exchange have succeeded or failed.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
Protocol operations are exchanged at the LDAP message layer. When the
transport connection is closed, any uncompleted operations at the
LDAP message layer, when possible, are abandoned, and when not
possible, are completed without transmission of the response. Also,
when the transport connection is closed, the client MUST NOT assume
that any uncompleted update operations have succeeded or failed.
4. Elements of Protocol 4. Elements of Protocol
The protocol is described using Abstract Syntax Notation One The protocol is described using Abstract Syntax Notation One
([ASN.1]), and is transferred using a subset of ASN.1 Basic Encoding ([ASN.1]), and is transferred using a subset of ASN.1 Basic Encoding
Rules ([BER]). Section 5 specifies how the protocol elements are Rules ([BER]). Section 5 specifies how the protocol elements are
encoded and transferred. encoded and transferred.
In order to support future extensions to this protocol, extensibility In order to support future extensions to this protocol, extensibility
is implied where it is allowed per ASN.1 (i.e. sequence, set, choice, is implied where it is allowed per ASN.1 (i.e. sequence, set, choice,
and enumerated types are extensible). In addition, ellipses (...) and enumerated types are extensible). In addition, ellipses (...)
have been supplied in ASN.1 types that are explicitly extensible as have been supplied in ASN.1 types that are explicitly extensible as
discussed in [LDAPIANA]. Because of the implied extensibility, discussed in [LDAPIANA]. Because of the implied extensibility,
clients and servers MUST (unless otherwise specified) ignore trailing clients and servers MUST (unless otherwise specified) ignore trailing
SEQUENCE components whose tags they do not recognize. SEQUENCE components whose tags they do not recognize.
Changes to the protocol other than through the extension mechanisms Changes to the protocol other than through the extension mechanisms
described here require a different version number. A client indicates described here require a different version number. A client indicates
the version it is using as part of the bind request, described in the version it is using as part of the BindRequest, described in
Section 4.2. If a client has not sent a bind, the server MUST assume Section 4.2. If a client has not sent a Bind, the server MUST assume
the client is using version 3 or later. the client is using version 3 or later.
Clients may determine the protocol versions a server supports by Clients may attempt to determine the protocol versions a server
reading the 'supportedLDAPVersion' attribute from the root DSE (DSA- supports by reading the 'supportedLDAPVersion' attribute from the
Specific Entry) [Models]. root DSE (DSA-Specific Entry) [Models].
4.1. Common Elements 4.1. Common Elements
This section describes the LDAPMessage envelope Protocol Data Unit This section describes the LDAPMessage envelope Protocol Data Unit
(PDU) format, as well as data type definitions, which are used in the (PDU) format, as well as data type definitions, which are used in the
protocol operations. protocol operations.
4.1.1. Message Envelope 4.1.1. Message Envelope
For the purposes of protocol exchanges, all protocol operations are For the purposes of protocol exchanges, all protocol operations are
encapsulated in a common envelope, the LDAPMessage, which is defined encapsulated in a common envelope, the LDAPMessage, which is defined
as follows: as follows:
LDAPMessage ::= SEQUENCE { LDAPMessage ::= SEQUENCE {
messageID MessageID, messageID MessageID,
protocolOp CHOICE { protocolOp CHOICE {
bindRequest BindRequest, bindRequest BindRequest,
bindResponse BindResponse, bindResponse BindResponse,
unbindRequest UnbindRequest, unbindRequest UnbindRequest,
searchRequest SearchRequest, searchRequest SearchRequest,
Lightweight Directory Access Protocol Version 3
searchResEntry SearchResultEntry, searchResEntry SearchResultEntry,
searchResDone SearchResultDone, searchResDone SearchResultDone,
searchResRef SearchResultReference, searchResRef SearchResultReference,
modifyRequest ModifyRequest, modifyRequest ModifyRequest,
modifyResponse ModifyResponse, modifyResponse ModifyResponse,
addRequest AddRequest, addRequest AddRequest,
Lightweight Directory Access Protocol Version 3
addResponse AddResponse, addResponse AddResponse,
delRequest DelRequest, delRequest DelRequest,
delResponse DelResponse, delResponse DelResponse,
modDNRequest ModifyDNRequest, modDNRequest ModifyDNRequest,
modDNResponse ModifyDNResponse, modDNResponse ModifyDNResponse,
compareRequest CompareRequest, compareRequest CompareRequest,
compareResponse CompareResponse, compareResponse CompareResponse,
abandonRequest AbandonRequest, abandonRequest AbandonRequest,
extendedReq ExtendedRequest, extendedReq ExtendedRequest,
extendedResp ExtendedResponse, extendedResp ExtendedResponse,
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The function of the LDAPMessage is to provide an envelope containing The function of the LDAPMessage is to provide an envelope containing
common fields required in all protocol exchanges. At this time the common fields required in all protocol exchanges. At this time the
only common fields are the messageID and the controls. only common fields are the messageID and the controls.
If the server receives a PDU from the client in which the LDAPMessage If the server receives a PDU from the client in which the LDAPMessage
SEQUENCE tag cannot be recognized, the messageID cannot be parsed, SEQUENCE tag cannot be recognized, the messageID cannot be parsed,
the tag of the protocolOp is not recognized as a request, or the the tag of the protocolOp is not recognized as a request, or the
encoding structures or lengths of data fields are found to be encoding structures or lengths of data fields are found to be
incorrect, then the server SHOULD return the Notice of Disconnection incorrect, then the server SHOULD return the Notice of Disconnection
described in Section 4.4.1, with the resultCode set to protocolError, described in Section 4.4.1, with the resultCode set to protocolError,
and MUST immediately close the connection. and MUST immediately close the transport connection.
In other cases where the client or server cannot parse a PDU, it In other cases where the client or server cannot parse a PDU, it
SHOULD abruptly close the connection where further communication SHOULD abruptly close the transport connection where further
(including providing notice) would be pernicious. Otherwise, server communication (including providing notice) would be
implementations MUST return an appropriate response to the request, pernicious. Otherwise, server implementations MUST return an
with the resultCode set to protocolError. appropriate response to the request, with the resultCode set to
protocolError.
4.1.1.1. Message ID 4.1.1.1. Message ID
All LDAPMessage envelopes encapsulating responses contain the All LDAPMessage envelopes encapsulating responses contain the
messageID value of the corresponding request LDAPMessage. messageID value of the corresponding request LDAPMessage.
The message ID of a request MUST have a non-zero value different from The message ID of a request MUST have a non-zero value different from
the the messageID of any other uncompleted requests in the LDAP the messageID of any other request in progress in the same LDAP
exchange. The zero value is reserved for the unsolicited notification
Lightweight Directory Access Protocol Version 3
session. The zero value is reserved for the unsolicited notification
message. 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 in the same LDAP exchange unless it can be determined earlier request in the same LDAP session unless it can be determined
that the server is no longer servicing the earlier request (e.g. that the server is no longer servicing the earlier request (e.g.
after the final response is received, or a subsequent Bind
Lightweight Directory Access Protocol Version 3
after the final response is received, or a subsequent bind
completes). Otherwise the behavior is undefined. For this purpose, completes). Otherwise the behavior is undefined. For this purpose,
note that abandon and abandoned operations do not send responses. note that Abandon and successfully abandoned operations do not send
responses.
4.1.2. String Types 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 ASN.1 OCTET STRING types, the strings of LDAPString type encode as ASN.1 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. Note that Unicode characters U+0000 following the [UTF-8] algorithm. Note that Unicode characters U+0000
through U+007F are the same as ASCII 0 through 127, respectively, and through U+007F are the same as ASCII 0 through 127, respectively, and
have the same single octet UTF-8 encoding. Other Unicode characters have the same single octet UTF-8 encoding. Other Unicode characters
have a multiple octet UTF-8 encoding. have a multiple octet UTF-8 encoding.
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LDAPDN ::= LDAPString LDAPDN ::= LDAPString
-- Constrained to <distinguishedName> [LDAPDN] -- Constrained to <distinguishedName> [LDAPDN]
A RelativeLDAPDN is defined to be the representation of a Relative A RelativeLDAPDN is defined to be the representation of a Relative
Distinguished Name (RDN) after encoding according to the Distinguished Name (RDN) after encoding according to the
specification in [LDAPDN]. specification in [LDAPDN].
RelativeLDAPDN ::= LDAPString RelativeLDAPDN ::= LDAPString
-- Constrained to <name-component> [LDAPDN] -- Constrained to <name-component> [LDAPDN]
Lightweight Directory Access Protocol Version 3
4.1.4. Attribute Descriptions 4.1.4. Attribute Descriptions
The definition and encoding rules for attribute descriptions are The definition and encoding rules for attribute descriptions are
defined in Section 2.5 of [Models]. Briefly, an attribute description defined in Section 2.5 of [Models]. Briefly, an attribute description
is an attribute type and zero or more options. is an attribute type and zero or more options.
AttributeDescription ::= LDAPString AttributeDescription ::= LDAPString
Lightweight Directory Access Protocol Version 3
-- Constrained to <attributedescription> -- Constrained to <attributedescription>
-- [Models] -- [Models]
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. The attribute value is encoded according to encoded attribute value. The attribute value is encoded according to
the LDAP-specific encoding definition of its corresponding syntax. the LDAP-specific encoding definition of its corresponding syntax.
The LDAP-specific encoding definitions for different syntaxes and The LDAP-specific encoding definitions for different syntaxes and
attribute types may be found in other documents and in particular attribute types may be found in other documents and in particular
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entry, and retrieve the descriptions of 'attributeTypes' from it entry, and retrieve the descriptions of 'attributeTypes' from it
[Models]. [Models].
Clients MUST only send attribute values in a request that are valid Clients MUST only send attribute values in a request that are valid
according to the syntax defined for the attributes. according to the syntax defined for the attributes.
4.1.6. Attribute Value Assertion 4.1.6. Attribute Value Assertion
The AttributeValueAssertion (AVA) type definition is similar to the The AttributeValueAssertion (AVA) type definition is similar to the
one in the X.500 Directory standards. It contains an attribute one in the X.500 Directory standards. It contains an attribute
description and a matching rule ([Models Section 4.1.3) assertion description and a matching rule ([Models] Section 4.1.3) assertion
value suitable for that type. Elements of this type are typically value suitable for that type. Elements of this type are typically
used to assert that the value in assertionValue matches a value of an used to assert that the value in assertionValue matches a value of an
attribute. attribute.
AttributeValueAssertion ::= SEQUENCE { AttributeValueAssertion ::= SEQUENCE {
attributeDesc AttributeDescription, attributeDesc AttributeDescription,
assertionValue AssertionValue } assertionValue AssertionValue }
AssertionValue ::= OCTET STRING AssertionValue ::= OCTET STRING
Lightweight Directory Access Protocol Version 3
The syntax of the AssertionValue depends on the context of the LDAP The syntax of the AssertionValue depends on the context of the LDAP
operation being performed. For example, the syntax of the EQUALITY operation being performed. For example, the syntax of the EQUALITY
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.
Lightweight Directory Access Protocol Version 3
4.1.7. Attribute and PartialAttribute 4.1.7. Attribute and PartialAttribute
Attributes and partial attributes consist of an attribute description Attributes and partial attributes consist of an attribute description
and attribute values. A PartialAttribute allows zero values, while and attribute values. A PartialAttribute allows zero values, while
Attribute requires at least one value. Attribute requires at least one value.
PartialAttribute ::= SEQUENCE { PartialAttribute ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
vals SET OF value AttributeValue } vals SET OF value AttributeValue }
Attribute ::= PartialAttribute(WITH COMPONENTS { Attribute ::= PartialAttribute(WITH COMPONENTS {
..., ...,
vals (SIZE(1..MAX))}) vals (SIZE(1..MAX))})
No two attribute values may be equivalent as described by Section 2.3 No two of the attribute values may be equivalent as described by
of [Models]. The set of attribute values is unordered. Section 2.3 of [Models]. The set of attribute values is unordered.
Implementations MUST NOT rely upon the ordering being repeatable. Implementations MUST NOT rely upon the ordering being repeatable.
4.1.8. Matching Rule Identifier 4.1.8. Matching Rule Identifier
Matching rules are defined in Section 4.1.3 of [Models]. A matching Matching rules are defined in Section 4.1.3 of [Models]. A matching
rule is identified in the protocol by the printable representation of rule is identified in the protocol by the printable representation of
either its <numericoid>, or one of its short name descriptors either its <numericoid>, or one of its short name descriptors
[Models], e.g. 'caseIgnoreMatch' or '2.5.13.2'. [Models], e.g. 'caseIgnoreMatch' or '2.5.13.2'.
MatchingRuleId ::= LDAPString MatchingRuleId ::= LDAPString
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 containing the elements found
containing the components of LDAPResult to indicate the final status in LDAPResult to indicate the final status of the protocol operation
of a protocol operation request. 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),
Lightweight Directory Access Protocol Version 3
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), confidentialityRequired (13),
saslBindInProgress (14), saslBindInProgress (14),
Lightweight Directory Access Protocol Version 3
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),
skipping to change at line 533 skipping to change at line 540
The resultCode enumeration is extensible as defined in Section 3.6 of The resultCode enumeration is extensible as defined in Section 3.6 of
[LDAPIANA]. The meanings of the listed result codes are given in [LDAPIANA]. The meanings of the listed result codes are given in
Appendix A. If a server detects multiple errors for an operation, Appendix A. If a server detects multiple errors for an operation,
only one result code is returned. The server should return the result only one result code is returned. The server should return the result
code that best indicates the nature of the error encountered. code that best indicates the nature of the error encountered.
The diagnosticMessage field of this construct may, at the server's The diagnosticMessage field of this construct may, at the server's
option, be used to return a string containing a textual, human- option, be used to return a string containing a textual, human-
readable (terminal control and page formatting characters should be readable (terminal control and page formatting characters should be
Lightweight Directory Access Protocol Version 3
avoided) diagnostic message. As this diagnostic message is not avoided) diagnostic message. As this diagnostic message is not
standardized, implementations MUST NOT rely on the values returned. standardized, implementations MUST NOT rely on the values returned.
If the server chooses not to return a textual diagnostic, the Diagnostic messages typically supplement the resultCode with
diagnosticMessage field MUST be empty. additional information. If the server chooses not to return a textual
diagnostic, the diagnosticMessage field MUST be empty.
For certain result codes (typically, but not restricted to For certain result codes (typically, but not restricted to
noSuchObject, aliasProblem, invalidDNSyntax and noSuchObject, aliasProblem, invalidDNSyntax and
aliasDereferencingProblem), the matchedDN field is set (subject to aliasDereferencingProblem), the matchedDN field is set (subject to
access controls) to the name of the last entry (object or alias) used access controls) to the name of the last entry (object or alias) used
in finding the target (or base) object. This will be a truncated form
Lightweight Directory Access Protocol Version 3 of the provided name or, if an alias was dereferenced while
attempting to locate the entry, of the resulting name. Otherwise the
in finding the target (or base) object. If no aliases were matchedDN field is empty.
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 of [X.511].
Otherwise the matchedDN field is empty.
4.1.10. Referral 4.1.10. Referral
The referral result code indicates that the contacted server cannot The referral result code indicates that the contacted server cannot
or will not perform the operation and that one or more other servers or will not perform the operation and that one or more other servers
may be able to. Reasons for this include: may be able to. Reasons for this include:
- The target entry of the request is not held locally, but the - The target entry of the request is not held locally, but the
server has knowledge of its possible existence elsewhere. server has knowledge of its possible existence elsewhere.
- The operation is restricted on this server -- perhaps due to a - The operation is restricted on this server -- perhaps due to a
read-only copy of an entry to be modified. read-only copy of an entry to be modified.
The referral field is present in an LDAPResult if the resultCode The referral field is present in an LDAPResult if the resultCode is
field value is referral, and absent with all other result codes. It set to referral, and absent with all other result codes. It contains
contains one or more references to one or more servers or services one or more references to one or more servers or services that may be
that may be accessed via LDAP or other protocols. Referrals can be accessed via LDAP or other protocols. Referrals can be returned in
returned in response to any operation request (except unbind and response to any operation request (except Unbind and Abandon which do
abandon which do not have responses). At least one URI MUST be not have responses). At least one URI MUST be present in the
present in the Referral. Referral.
During a search operation, after the baseObject is located, and During a Search operation, after the baseObject is located, and
entries are being evaluated, the referral is not returned. Instead, entries are being evaluated, the referral is not returned. Instead,
continuation references, described in Section 4.5.3, are returned continuation references, described in Section 4.5.3, are returned
when other servers would need to be contacted to complete the when other servers would need to be contacted to complete the
operation. operation.
Referral ::= SEQUENCE SIZE (1..MAX) OF uri URI Referral ::= SEQUENCE SIZE (1..MAX) OF uri URI
URI ::= LDAPString -- limited to characters permitted in URI ::= LDAPString -- limited to characters permitted in
-- URIs -- URIs
If the client wishes to progress the operation, it MUST follow the If the client wishes to progress the operation, it contacts one of
referral by contacting one of the supported services. If multiple the supported services found in the referral. If multiple URIs are
URIs are present, the client assumes that any supported URI may be present, the client assumes that any supported URI may be used to
used to progress the operation. progress the operation.
Protocol peers that follow referrals MUST ensure that they do not Protocol peers that follow referrals MUST ensure that they do not
loop between servers. They MUST NOT repeatedly contact the same loop between servers. They MUST NOT repeatedly contact the same
server for the same request with the same target entry name, scope
and filter. Some implementations use a counter that is incremented Lightweight Directory Access Protocol Version 3
each time referral handling occurs for an operation, and these kinds
of implementations MUST be able to handle at least ten nested server for the same request with the same parameters. Some
referrals between the root and a leaf entry. implementations use a counter that is incremented each time referral
handling occurs for an operation, and these kinds of implementations
MUST be able to handle at least ten nested referrals between the root
and a leaf entry.
A URI for a server implementing LDAP and accessible via [TCP]/[IP] A URI for a server implementing LDAP and accessible via [TCP]/[IP]
(v4 or v6) is written as an LDAP URL according to [LDAPURL]. (v4 or v6) is written as an LDAP URL according to [LDAPURL].
Lightweight Directory Access Protocol Version 3 Referral values which are LDAP URLs follow these rules:
When an LDAP URL is used, the following instructions are followed:
- If an alias was dereferenced, the <dn> part of the URL MUST be - If an alias was dereferenced, the <dn> part of the URL MUST be
present, with the new target object name. UTF-8 encoded characters present, with the new target object name.
appearing in the string representation of a DN or search filter
may not be legal for URLs (e.g. spaces) and MUST be escaped using
the % method in [URI].
- It is RECOMMENDED that the <dn> part be present to avoid - It is RECOMMENDED that the <dn> part be present to avoid
ambiguity. ambiguity.
- If the <dn> part is present, the client MUST use this name in its - If the <dn> part is present, the client uses this name in its next
next request to progress the operation, and if it is not present request to progress the operation, and if it is not present the
the client will use the same name as in the original request. client uses the same name as in the original request.
- Some servers (e.g. participating in distributed indexing) may - Some servers (e.g. participating in distributed indexing) may
provide a different filter in a URL of a referral for a search provide a different filter in a URL of a referral for a Search
operation. operation.
- If the <filter> part of the LDAP URL is present, the client MUST - If the <filter> part of the LDAP URL is present, the client uses
use this filter in its next request to progress this search, and this filter in its next request to progress this Search, and if it
if it is not present the client MUST use the same filter as it is not present the client uses the same filter as it used for that
used for that search. Search.
- For search, it is RECOMMENDED that the <scope> part be present to - For Search, it is RECOMMENDED that the <scope> part be present to
avoid ambiguity. avoid ambiguity.
- If the <scope> part is missing, the scope of the original search - If the <scope> part is missing, the scope of the original Search
is used by the client to progress the operation. is used by the client to progress the operation.
- Other aspects of the new request may be the same as or different - Other aspects of the new request may be the same as or different
from the request which generated the referral. from the request which generated the referral.
Other kinds of URIs may be returned. The syntax and semantics of such Other kinds of URIs may be returned. The syntax and semantics of such
URIs is left to future specifications. Clients may ignore URIs that URIs is left to future specifications. Clients may ignore URIs that
they do not support. they do not support.
UTF-8 encoded characters appearing in the string representation of a
DN, search filter, or other fields may not be legal for URLs (e.g.
spaces) and MUST be escaped using the % method in [URI].
4.1.11. Controls 4.1.11. Controls
Controls provide a mechanism whereby the semantics and arguments of Controls provide a mechanism whereby the semantics and arguments of
existing LDAP operations may be extended. One or more controls may be existing LDAP operations may be extended. One or more controls may be
attached to a single LDAP message. A control only affects the attached to a single LDAP message. A control only affects the
semantics of the message it is attached to. semantics of the message it is attached to.
Lightweight Directory Access Protocol Version 3
Controls sent by clients are termed 'request controls' and those sent Controls sent by clients are termed 'request controls' and those sent
by servers are termed 'response controls'. by servers are termed 'response controls'.
Controls ::= SEQUENCE OF control Control Controls ::= SEQUENCE OF control Control
Control ::= SEQUENCE { Control ::= SEQUENCE {
controlType LDAPOID, controlType LDAPOID,
criticality BOOLEAN DEFAULT FALSE, criticality BOOLEAN DEFAULT FALSE,
controlValue OCTET STRING OPTIONAL } controlValue OCTET STRING OPTIONAL }
Lightweight Directory Access Protocol Version 3
The controlType field is the dotted-decimal representation of an The controlType field is the dotted-decimal representation of an
OBJECT IDENTIFIER which uniquely identifies the control. This OBJECT IDENTIFIER which uniquely identifies the control. This
provides unambiguous naming of controls. Often, response control(s) provides unambiguous naming of controls. Often, response control(s)
solicited by a request control share controlType values with the solicited by a request control share controlType values with the
request control. request control.
The criticality field only has meaning in controls attached to The criticality field only has meaning in controls attached to
request messages (except unbindRequest). For controls attached to request messages (except UnbindRequest). For controls attached to
response messages and the unbindRequest, the criticality field SHOULD response messages and the UnbindRequest, the criticality field SHOULD
be FALSE, and MUST be ignored by the receiving protocol peer. A value be FALSE, and MUST be ignored by the receiving protocol peer. A value
of TRUE indicates that it is unacceptable to perform the operation of TRUE indicates that it is unacceptable to perform the operation
without applying the semantics of the control and FALSE otherwise. without applying the semantics of the control. Specifically, the
Specifically, the criticality field is applied as follows: criticality field is applied as follows:
- Regardless of the value of the criticality field, if the server - Regardless of the value of the criticality field, if the server
recognizes the control type and it is appropriate for the recognizes the control type and it is appropriate for the
operation, the server is to make use of the control when operation, the server is to make use of the control when
performing the operation. performing the operation.
- If the server does not recognize the control type or it is not - If the server does not recognize the control type or it is not
appropriate for the operation, and the criticality field is TRUE, appropriate for the operation, and the criticality field is TRUE,
the server MUST NOT perform the operation, and for operations that the server MUST NOT perform the operation, and for operations that
have a response message, MUST return unavailableCriticalExtension have a response message, MUST return with the resultCode set to
in the resultCode. unavailableCriticalExtension.
- If the server does not recognize the control type or it is not - If the server does not recognize the control type or it is not
appropriate for the operation, and the criticality field is FALSE, appropriate for the operation, and the criticality field is FALSE,
the server MUST ignore the control. the server MUST ignore the control.
The controlValue may contain information associated with the The controlValue may contain information associated with the
controlType. Its format is defined by the specification of the controlType. Its format is defined by the specification of the
control. Implementations MUST be prepared to handle arbitrary control. Implementations MUST be prepared to handle arbitrary
contents of the controlValue octet string, including zero bytes. It contents of the controlValue octet string, including zero bytes. It
is absent only if there is no value information which is associated is absent only if there is no value information which is associated
with a control of its type. When a controlValue is defined in terms with a control of its type. When a controlValue is defined in terms
of ASN.1, and BER encoded according to Section 5.2, it also follows of ASN.1, and BER encoded according to Section 5.1, it also follows
the extensibility rules in Section 4. the extensibility rules in Section 4.
Servers list the controlType of request controls they recognize in Servers list the controlType of request controls they recognize in
the 'supportedControl' attribute in the root DSE (Section 5.1 of the 'supportedControl' attribute in the root DSE (Section 5.1 of
[Models]). [Models]).
Lightweight Directory Access Protocol Version 3
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. When a combination of controls specification most recently published. When a combination of controls
is encountered whose semantics are invalid, not specified (or not is encountered whose semantics are invalid, not specified (or not
known), the message is considered to be not well-formed, thus the known), the message is considered to be not well-formed, thus the
operation fails with protocolError. Additionally, unless order- operation fails with protocolError. Additionally, unless order-
dependent semantics are given in a specification, the order of a dependent semantics are given in a specification, the order of a
combination of controls in the SEQUENCE is ignored. Where the order combination of controls in the SEQUENCE is ignored. Where the order
is to be ignored but cannot be ignored by the server, the message is is to be ignored but cannot be ignored by the server, the message is
Lightweight Directory Access Protocol Version 3
considered not well-formed and the operation fails with considered not well-formed and the operation fails with
protocolError. protocolError.
This document does not specify any controls. Controls may be This document does not specify any controls. Controls may be
specified in other documents. Documents detailing control extensions specified in other documents. Documents detailing control extensions
are to provide for each control: are to provide for each control:
- the OBJECT IDENTIFIER assigned to the control, - the OBJECT IDENTIFIER assigned to the control,
- direction as to what value the sender should provide for the - direction as to what value the sender should provide for the
criticality field (note: the semantics of the criticality field criticality field (note: the semantics of the criticality field
are defined above should not be altered by the control's are defined above should not be altered by the control's
specification), specification),
- whether information is to be present in the controlValue field, - whether the controlValue field is present, and if so, the format
and if so, the format of the controlValue contents, of its contents,
- the semantics of the control, and - the semantics of the control, and
- optionally, semantics regarding the combination of the control - optionally, semantics regarding the combination of the control
with other controls. with other controls.
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. The Bind information to be exchanged between the client and server. The Bind
operation should be thought of as the "authenticate" operation. operation should be thought of as the "authenticate" operation.
Operational, authentication, and security-related semantics of this Operational, authentication, and security-related semantics of this
operation are given in [AuthMeth]. operation are given in [AuthMeth].
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 }
AuthenticationChoice ::= CHOICE { AuthenticationChoice ::= CHOICE {
simple [0] OCTET STRING, simple [0] OCTET STRING,
-- 1 and 2 reserved -- 1 and 2 reserved
sasl [3] SaslCredentials, sasl [3] SaslCredentials,
... } ... }
Lightweight Directory Access Protocol Version 3
SaslCredentials ::= SEQUENCE { SaslCredentials ::= SEQUENCE {
mechanism LDAPString, mechanism LDAPString,
credentials OCTET STRING OPTIONAL } credentials OCTET STRING OPTIONAL }
Fields of the Bind Request are: Fields 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 for the LDAP exchange. This document describes version to be used at the LDAP message layer. This document describes
3 of the protocol. There is no version negotiation. The client version 3 of the protocol. There is no version negotiation. The
sets this field to the version it desires. If the server does not client sets this field to the version it desires. If the server
does not support the specified version, it MUST respond with a
Lightweight Directory Access Protocol Version 3 BindResponse where the resultCode is set to protocolError.
support the specified version, it MUST respond with protocolError
in the resultCode field of the BindResponse.
- name: If not empty, the name of the Directory object that the - name: If not empty, the name of the Directory object that the
client wishes to bind as. This field may take on a null value (a client wishes to bind as. This field may take on a null value (a
zero length string) for the purposes of anonymous binds zero length string) for the purposes of anonymous binds
([AuthMeth] Section 5.1) or when using Simple Authentication and ([AuthMeth] Section 5.1) or when using Simple Authentication and
Security Layer [SASL] authentication ([AuthMeth] Section 3.3.2). Security Layer [SASL] authentication ([AuthMeth] Section 3.3.2).
Where the server attempts to locate the named object, it SHALL NOT Where the server attempts to locate the named object, it SHALL NOT
perform alias dereferencing. perform alias dereferencing.
- authentication: information used in authentication. This type is - authentication: information used in authentication. This type is
extensible as defined in Section 3.7 of [LDAPIANA]. Servers that extensible as defined in Section 3.7 of [LDAPIANA]. Servers that
do not support a choice supplied by a client return do not support a choice supplied by a client return a BindResponse
authMethodNotSupported in the resultCode field of the with the resultCode set to authMethodNotSupported.
BindResponse.
Textual passwords (consisting of a character sequence with a known Textual passwords (consisting of a character sequence with a known
character set and encoding) transferred to the server using the character set and encoding) transferred to the server using the
simple AuthenticationChoice SHALL be transferred as [UTF-8] simple AuthenticationChoice SHALL be transferred as [UTF-8]
encoded [Unicode]. Prior to transfer, clients SHOULD prepare text encoded [Unicode]. Prior to transfer, clients SHOULD prepare text
passwords by applying the [SASLprep] profile of the [Stringprep] passwords by applying the [SASLprep] profile of the [Stringprep]
algorithm. Passwords consisting of other data (such as random algorithm. Passwords consisting of other data (such as random
octets) MUST NOT be altered. The determination of whether a octets) MUST NOT be altered. The determination of whether a
password is textual is a local client matter. password is textual is a local client matter.
Authorization is the decision of which access an operation has to the
directory. Among other things, the process of authorization takes as
input authentication information obtained during the bind operation
and/or other acts of authentication (such as lower layer security
services).
4.2.1. Processing of the Bind Request 4.2.1. Processing of the Bind Request
Before processing a BindRequest, all uncompleted operations MUST Before processing a BindRequest, all uncompleted operations MUST
either complete or be abandoned. The server may either wait for the either complete or be abandoned. The server may either wait for the
uncompleted operations to complete, or abandon them. The server then uncompleted operations to complete, or abandon them. The server then
proceeds to authenticate the client in either a single-step, or proceeds to authenticate the client in either a single-step, or
multi-step bind process. Each step requires the server to return a multi-step Bind process. Each step requires the server to return a
BindResponse to indicate the status of authentication. BindResponse to indicate the status of authentication.
After sending a BindRequest, clients MUST NOT send further LDAP PDUs After sending a BindRequest, clients MUST NOT send further LDAP PDUs
until receiving the BindResponse. Similarly, servers SHOULD NOT until receiving the BindResponse. Similarly, servers SHOULD NOT
process or respond to requests received while processing a process or respond to requests received while processing a
BindRequest. BindRequest.
If the client did not bind before sending a request and receives an If the client did not bind before sending a request and receives an
operationsError to that request, it may then send a Bind Request. If operationsError to that request, it may then send a Bind Request. If
this also fails or the client chooses not to bind on the existing this also fails or the client chooses not to bind on the existing
LDAP exchange, it may close the connection, reopen it and begin again LDAP session, it may close the transport connection, reopen it and
by first sending a PDU with a Bind Request. This will aid in
interoperating with servers implementing other versions of LDAP.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
Clients may send multiple Bind Requests on an LDAP exchange to change begin again by first sending a PDU with a BindRequest. This will aid
the authentication and/or security associations or to complete a in interoperating with servers implementing other versions of LDAP.
multi-stage bind process. Authentication from earlier binds is
subsequently ignored. Clients may send multiple Bind requests to change the authentication
and/or security associations or to complete a multi-stage Bind
process. Authentication from earlier binds is subsequently ignored.
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 ([AuthMeth] Section client to invoke the BindRequest multiple times ([AuthMeth] Section
8.2). Clients MUST NOT invoke operations between two Bind Requests 8.2). Clients MUST NOT invoke operations between two Bind requests
made as part of a multi-stage bind. 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 the
authMethodNotSupported as the resultCode. This will allow clients to resultCode set to authMethodNotSupported. 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.
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.
A successful bind operation is indicated by a BindResponse with a A successful Bind operation is indicated by a BindResponse with a
resultCode set to success. Otherwise, an appropriate result code is resultCode set to success. Otherwise, an appropriate result code is
set in the BindResponse. For bind, the protocolError result code may set in the BindResponse. For BindResponse, the protocolError result
be used to indicate that the version number supplied by the client is code may be used to indicate that the version number supplied by the
unsupported. client is unsupported.
If the client receives a BindResponse where the resultCode field is If the client receives a BindResponse where the resultCode is set to
protocolError, it is to assume that the server does not support this protocolError, it is to assume that the server does not support this
version of LDAP. While the client may be able proceed with another version of LDAP. While the client may be able proceed with another
version of this protocol (this may or may not require closing and re- version of this protocol (this may or may not require closing and re-
establishing the connection), how to proceed with another version of establishing the transport connection), how to proceed with another
this protocol is beyond the scope of this document. Clients which are version of this protocol is beyond the scope of this document.
unable or unwilling to proceed SHOULD close the connection. Clients which are unable or unwilling to proceed SHOULD close the
transport connection.
The serverSaslCreds field is used as part of a SASL-defined bind The serverSaslCreds field is used as part of a SASL-defined bind
mechanism to allow the client to authenticate the server to which it mechanism to allow the client to authenticate the server to which it
is communicating, or to perform "challenge-response" authentication. is communicating, or to perform "challenge-response" authentication.
If the client bound with the simple choice, or the SASL mechanism If the client bound with the simple choice, or the SASL mechanism
does not require the server to return information to the client, then
this field SHALL NOT be included in the BindResponse.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
does not require the server to return information to the client, then
this field SHALL NOT be included in the BindResponse.
4.3. Unbind Operation 4.3. Unbind Operation
The function of the Unbind Operation is to terminate an LDAP exchange The function of the Unbind operation is to terminate an LDAP session.
and close the connection. The Unbind operation is not the antithesis The Unbind operation is not the antithesis of the Bind operation as
of the Bind operation as the name implies. The naming of these the name implies. The naming of these operations are historical. The
operations is historical. The Unbind operation should be thought of Unbind operation should be thought of as the "quit" operation.
as the "quit" operation.
The Unbind Operation is defined as follows: The Unbind operation is defined as follows:
UnbindRequest ::= [APPLICATION 2] NULL UnbindRequest ::= [APPLICATION 2] NULL
The Unbind Operation has no response defined. Upon transmission of The client, upon transmission of the UnbindRequest, and the server,
the UnbindRequest, each protocol peer is to consider the LDAP upon receipt of the UnbindRequest are to close the LDAP session as
exchange terminated, MUST cease transmission of messages to the other follows:
peer, and MUST close the connection. Uncompleted operations are
handled as specified in Section 5.1. - cease exchanges at the LDAP message layer,
- close the SASL layer (if installed),
- close the TLS layer (if installed), and
- close the transport connection.
Uncompleted operations are handled as specified in Section 5.1.
4.4. Unsolicited Notification 4.4. Unsolicited Notification
An unsolicited notification is an LDAPMessage sent from the server to An unsolicited notification is an LDAPMessage sent from the server to
the client which is not in response to any LDAPMessage received by the client which is not in response to any LDAPMessage received by
the server. It is used to signal an extraordinary condition in the the server. It is used to signal an extraordinary condition in the
server or in the LDAP exchange or connection between the client and server or in the LDAP session between the client and the server. The
the server. The notification is of an advisory nature, and the server notification is of an advisory nature, and the server will not expect
will not expect any response to be returned from the client. any response to be returned from the client.
The unsolicited notification is structured as an LDAPMessage in which The unsolicited notification is structured as an LDAPMessage in which
the messageID is zero and protocolOp is of the extendedResp form (See the messageID is zero and protocolOp is set to the extendedResp
Section 4.12). The responseName field of the ExtendedResponse always choice using the ExtendedResponse type (See Section 4.12). The
contains an LDAPOID which is unique for this notification. responseName field of the ExtendedResponse always contains an LDAPOID
which is unique for this notification.
One unsolicited notification (Notice of Disconnection) is defined in One unsolicited notification (Notice of Disconnection) is defined in
this document. The specification of an unsolicited notification this document. The specification of an unsolicited notification
consists of: consists of:
- the OBJECT IDENTIFIER assigned to the notification (to be - the OBJECT IDENTIFIER assigned to the notification (to be
specified in the responseName, specified in the responseName,
- the format of the contents (if any) of the responseValue, - the format of the contents of the responseValue (if any),
- the circumstances which will cause the notification to be - the circumstances which will cause the notification to be sent,
returned, and and
- the semantics of the operation. Lightweight Directory Access Protocol Version 3
- the semantics of the message.
4.4.1. Notice of Disconnection 4.4.1. Notice of Disconnection
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 transport connection on its own
condition. This notification is intended to assist clients in initiative. This notification is intended to assist clients in
distinguishing between an error condition and a transient network distinguishing between an exceptional server condition and a
transient network failure. Note that this notification is not a
Lightweight Directory Access Protocol Version 3 response to an Unbind requested by the client. Uncompleted operations
are handled as specified in Section 5.1.
failure. Note that this notification is not a response to an unbind
requested by the client. Uncompleted operations are handled as
specified in Section 5.1.
The responseName is 1.3.6.1.4.1.1466.20036, the responseValue field The responseName is 1.3.6.1.4.1.1466.20036, the responseValue field
is absent, and the resultCode is used to indicate the reason for the is absent, and the resultCode is used to indicate the reason for the
disconnection. disconnection. When the strongAuthRequired resultCode is returned
with this message, it indicates that the server has detected that an
established security association between the client and server has
unexpectedly failed or been compromised.
Upon transmission of the Notice of Disconnection, the server is to Upon transmission of the Notice of Disconnection, the server MUST
consider the LDAP exchange terminated, MUST cease transmission of cease transmission of messages to the client, and MUST close the
messages to the client, and MUST close the connection. transport connection.
4.5. Search Operation 4.5. Search Operation
The Search Operation is used to request a server to return, subject The Search operation is used to request a server to return, subject
to access controls and other restrictions, a set of entries matching to access controls and other restrictions, a set of entries matching
a complex search criterion. This can be used to read attributes from a complex search criterion. This can be used to read attributes from
a single entry, from entries immediately subordinate to a particular a single entry, from entries immediately subordinate to a particular
entry, or a whole subtree of entries. entry, or a whole subtree of entries.
4.5.1. Search Request 4.5.1. Search Request
The Search Request is defined as follows: The Search request is defined as follows:
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),
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,
Lightweight Directory Access Protocol Version 3
attributes AttributeSelection } attributes AttributeSelection }
AttributeSelection ::= SEQUENCE OF selector LDAPString AttributeSelection ::= SEQUENCE OF selector LDAPString
-- The LDAPString is constrained to -- The LDAPString is constrained to
-- <attributeSelector> below -- <attributeSelector> below
Filter ::= CHOICE { Filter ::= CHOICE {
and [0] SET OF filter Filter, and [0] SET SIZE (1..MAX) OF filter Filter,
or [1] SET OF filter Filter, or [1] SET SIZE (1..MAX) OF filter 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,
Lightweight Directory Access Protocol Version 3
lessOrEqual [6] AttributeValueAssertion, lessOrEqual [6] AttributeValueAssertion,
present [7] AttributeDescription, present [7] AttributeDescription,
approxMatch [8] AttributeValueAssertion, approxMatch [8] AttributeValueAssertion,
extensibleMatch [9] MatchingRuleAssertion } extensibleMatch [9] MatchingRuleAssertion,
... }
SubstringFilter ::= SEQUENCE { SubstringFilter ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
-- initial and final can occur at most once
substrings SEQUENCE SIZE (1..MAX) OF substring CHOICE { substrings SEQUENCE SIZE (1..MAX) OF substring CHOICE {
initial [0] AssertionValue, initial [0] AssertionValue, -- can occur at most once
any [1] AssertionValue, any [1] AssertionValue,
final [2] AssertionValue } } final [2] AssertionValue } -- can occur at most once
}
MatchingRuleAssertion ::= SEQUENCE { MatchingRuleAssertion ::= SEQUENCE {
matchingRule [1] MatchingRuleId OPTIONAL, matchingRule [1] MatchingRuleId OPTIONAL,
type [2] AttributeDescription OPTIONAL, type [2] AttributeDescription OPTIONAL,
matchValue [3] AssertionValue, matchValue [3] AssertionValue,
dnAttributes [4] BOOLEAN DEFAULT FALSE } dnAttributes [4] BOOLEAN DEFAULT FALSE }
Fields of the Search Request are: Note that an X.500 "list"-like operation can be emulated by the
client requesting a singleLevel Search operation with a filter
checking for the presence of the 'objectClass' attribute, and that an
X.500 "read"-like operation can be emulated by a baseObject Search
operation with the same filter. A server which provides a gateway to
X.500 is not required to use the Read or List operations, although it
may choose to do so, and if it does, it must provide the same
semantics as the X.500 Search operation.
- baseObject: The name of the base object entry relative to which 4.5.1.1 SearchRequest.baseObject
the search is to be performed.
- scope: Specifies the scope of the search to be performed. The The name of the base object entry (or possibly the root) relative to
semantics (as described in [X.511]) of the possible values of this which the Search is to be performed.
field are:
4.5.1.2 SearchRequest.scope
Specifies the scope of the Search to be performed. The semantics (as
described in [X.511]) of the possible values of this field are:
Lightweight Directory Access Protocol Version 3
baseObject: The scope is constrained to the entry named by baseObject: The scope is constrained to the entry named by
baseObject. baseObject.
singleLevel: The scope is constrained to the immediate singleLevel: The scope is constrained to the immediate
subordinates of the entry named by baseObject. subordinates of the entry named by baseObject.
wholeSubtree: the scope is constrained to the entry named by wholeSubtree: the scope is constrained to the entry named by the
the baseObject, and all its subordinates. baseObject, and all its subordinates.
- derefAliases: An indicator as to how alias entries (as defined in 4.5.1.3 SearchRequest.derefAliases
[Models]) are to be handled in searching. The semantics of the
possible values of this field are:
neverDerefAliases: Do not dereference aliases in searching or An indicator as to how alias entries (as defined in [Models]) are to
in locating the base object of the search. be handled in searching. The semantics of the defined values of this
field are:
derefInSearching: While searching, dereference any alias entry neverDerefAliases: Do not dereference aliases in searching or in
subordinate to the base object which is also in the search locating the base object of the Search.
scope. The filter is applied to the dereferenced object(s). If
the search scope is wholeSubtree, the search continues in the
subtree of any dereferenced object. Aliases in that subtree are
also dereferenced. Servers SHOULD eliminate duplicate entries
that arise due to alias dereferencing while searching.
Lightweight Directory Access Protocol Version 3 derefInSearching: While searching subordinates of the base object,
dereference any alias within the search scope (the act of
dereferencing an alias includes recursively dereferencing aliases
which refer to aliases). Dereferenced objects become the vertices
of further search scopes where the Search operation continues. If
the search scope is wholeSubtree, the Search continues in the
subtree(s) of any dereferenced object. If the search scope is
singleLevel, the search is applied to any dereferenced objects,
and is not applied to their subordinates. Servers SHOULD eliminate
duplicate entries that arise due to alias dereferencing while
searching.
derefFindingBaseObj: Dereference aliases in locating the base derefFindingBaseObj: Dereference aliases in locating the base
object of the search, but not when searching subordinates of object of the Search, but not when searching subordinates of the
the base object. base object.
derefAlways: Dereference aliases both in searching and in
locating the base object of the search.
Servers MUST detect looping while dereferencing aliases in order
to prevent denial of service attacks of this nature.
- sizeLimit: A size limit that restricts the maximum number of
entries to be returned as a result of the search. A value of zero
in this field indicates that no client-requested size limit
restrictions are in effect for the search. Servers may also
enforce a maximum number of entries to return.
- timeLimit: A time limit that restricts the maximum time (in
seconds) allowed for a search. A value of zero in this field
indicates that no client-requested time limit restrictions are in
effect for the search. Servers may also enforce a maximum time
limit for the search.
- typesOnly: An indicator as to whether search results are to derefAlways: Dereference aliases both in searching and in locating
contain both attribute descriptions and values, or just attribute the base object of the Search.
descriptions. Setting this field to TRUE causes only attribute
descriptions (no values) to be returned. Setting this field to
FALSE causes both attribute descriptions and values to be
returned.
- filter: A filter that defines the conditions that must be Servers MUST detect looping while dereferencing aliases in order to
fulfilled in order for the search to match a given entry. prevent denial of service attacks of this nature.
The 'and', 'or' and 'not' choices can be used to form combinations 4.5.1.4 SearchRequest.sizeLimit
of filters. At least one filter element MUST be present in an
'and' or 'or' choice. The others match against individual
attribute values of entries in the scope of the search.
(Implementor's note: the 'not' filter is an example of a tagged
choice in an implicitly-tagged module. In BER this is treated as
if the tag was explicit.)
A server MUST evaluate filters according to the three-valued logic A size limit that restricts the maximum number of entries to be
of X.511 (1993) Section 7.8.1. In summary, a filter is evaluated returned as a result of the Search. A value of zero in this field
to either "TRUE", "FALSE" or "Undefined". If the filter evaluates indicates that no client-requested size limit restrictions are in
to TRUE for a particular entry, then the attributes of that entry effect for the Search. Servers may also enforce a maximum number of
are returned as part of the search result (subject to any entries to return.
applicable access control restrictions). If the filter evaluates
to FALSE or Undefined, then the entry is ignored for the search.
A filter of the "and" choice is TRUE if all the filters in the SET 4.5.1.5 SearchRequest.timeLimit
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
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'
choice is TRUE if the filter being negated is FALSE, FALSE if it
is TRUE, and Undefined if it is Undefined.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
The present match evaluates to TRUE where there is an attribute or A time limit that restricts the maximum time (in seconds) allowed for
subtype of the specified attribute description present in an a Search. A value of zero in this field indicates that no client-
entry, and FALSE otherwise (including a presence test with an requested time limit restrictions are in effect for the Search.
unrecognized attribute description.) Servers may also enforce a maximum time limit for the Search.
The matching rule for equalityMatch filter items is defined by the
EQUALITY matching rule for the attribute type.
There SHALL be at most one 'initial', and at most one 'final' in
the 'substrings' of a SubstringFilter. If 'initial' is present, it
SHALL be the first element of 'substrings'. If 'final' is present,
it SHALL be the last element of 'substrings'.
The matching rule for AssertionValues in a substrings filter item
is defined by the SUBSTR matching rule for the attribute type.
Note that the AssertionValue in a substrings filter item conforms
to the assertion syntax of the EQUALITY matching rule for the
attribute type rather than the assertion syntax of the SUBSTR
matching rule for the attribute type. Conceptually, the entire
SubstringFilter is converted into an assertion value of the
substrings matching rule prior to applying the rule.
The matching rule for the greaterOrEqual filter item is defined by
the ORDERING and EQUALITY matching rules for the attribute type.
The matching rule for the lessOrEqual filter item is defined by
the ORDERING matching rule for the attribute type.
An approxMatch filter item evaluates to TRUE when there is a value
of the attribute or subtype for which some locally-defined
approximate matching algorithm (e.g. spelling variations, phonetic
match, etc.) returns TRUE. If an item matches for equality, it
also satisfies an approximate match. If approximate matching is
not supported for the attribute, this filter item should be
treated as an equalityMatch.
An extensibleMatch filter item is evaluated as follows: 4.5.1.6 SearchRequest.typesOnly
If the matchingRule field is absent, the type field MUST be An indicator as to whether Search results are to contain both
present, and an equality match is performed for that type. attribute descriptions and values, or just attribute descriptions.
Setting this field to TRUE causes only attribute descriptions (no
values) to be returned. Setting this field to FALSE causes both
attribute descriptions and values to be returned.
If the type field is absent and the matchingRule is present, the 4.5.1.7 SearchRequest.filter
matchValue is compared against all attributes in an entry which
support that matchingRule. The matchingRule determines the
syntax for the assertion value. The filter item evaluates to
TRUE if it matches with at least one attribute in the entry,
FALSE if it does not match any attribute in the entry, and
Undefined if the matchingRule is not recognized or the
assertionValue is invalid.
If the type field is present and the matchingRule is present, A filter that defines the conditions that must be fulfilled in order
the matchValue is compared against entry attributes of the for the Search to match a given entry.
specified type. In this case, the matchingRule MUST be one
Lightweight Directory Access Protocol Version 3 The 'and', 'or' and 'not' choices can be used to form combinations of
filters. At least one filter element MUST be present in an 'and' or
'or' choice. The others match against individual attribute values of
entries in the scope of the Search. (Implementor's note: the 'not'
filter is an example of a tagged choice in an implicitly-tagged
module. In BER this is treated as if the tag was explicit.)
suitable for use with the specified type (see [Syntaxes]), A server MUST evaluate filters according to the three-valued logic of
otherwise the filter item is Undefined. [X.511] (1993) Clause 7.8.1. In summary, a filter is evaluated to
either "TRUE", "FALSE" or "Undefined". If the filter evaluates to
TRUE for a particular entry, then the attributes of that entry are
returned as part of the Search result (subject to any applicable
access control restrictions). If the filter evaluates to FALSE or
Undefined, then the entry is ignored for the Search.
If the dnAttributes field is set to TRUE, the match is A filter of the "and" choice is TRUE if all the filters in the SET OF
additionally applied against all the AttributeValueAssertions in evaluate to TRUE, FALSE if at least one filter is FALSE, and
an entry's distinguished name, and evaluates to TRUE if there is otherwise Undefined. A filter of the "or" choice is FALSE if all of
at least one attribute in the distinguished name for which the the filters in the SET OF evaluate to FALSE, TRUE if at least one
filter item evaluates to TRUE. The dnAttributes field is present filter is TRUE, and Undefined otherwise. A filter of the 'not' choice
to alleviate the need for multiple versions of generic matching is TRUE if the filter being negated is FALSE, FALSE if it is TRUE,
rules (such as word matching), where one applies to entries and and Undefined if it is Undefined.
another applies 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. able to determine whether the assertion value matches an entry.
Examples include: Examples include:
- An attribute description in an equalityMatch, substrings, - An attribute description in an equalityMatch, substrings,
greaterOrEqual, lessOrEqual, approxMatch or extensibleMatch greaterOrEqual, lessOrEqual, approxMatch or extensibleMatch
filter is not recognized by the server. filter is not recognized by the server.
- The attribute type does not define the appropriate matching - The attribute type does not define the appropriate matching
rule. rule.
Lightweight Directory Access Protocol Version 3
- A MatchingRuleId in the extensibleMatch is not recognized by - A MatchingRuleId in the extensibleMatch is not recognized by
the server or is not valid for the attribute type. the server or is not valid for the attribute type.
- The type of filtering requested is not implemented. - The type of filtering requested is not implemented.
- The assertion value is invalid. - The assertion value is invalid.
For example, if a server did not recognize the attribute type For example, if a server did not recognize the attribute type
shoeSize, a filter of (shoeSize=*) would evaluate to FALSE, and shoeSize, a filter of (shoeSize=*) would evaluate to FALSE, and the
the filters (shoeSize=12), (shoeSize>=12) and (shoeSize<=12) would filters (shoeSize=12), (shoeSize>=12) and (shoeSize<=12) would each
each evaluate to Undefined. evaluate to Undefined.
Servers MUST NOT return errors if attribute descriptions or Servers MUST NOT return errors if attribute descriptions or matching
matching rule ids are not recognized, assertion values are rule ids are not recognized, assertion values are invalid, or the
invalid, or the assertion syntax is not supported. More details of assertion syntax is not supported. More details of filter processing
filter processing are given in Section 7.8 of [X.511]. are given in Clause 7.8 of [X.511].
- attributes: A selection list of the attributes to be returned from 4.5.1.7.1 SearchRequest.filter.equalityMatch
each entry which matches the search filter. LDAPString values of
this field are constrained to the following Augmented Backus-Naur The matching rule for equalityMatch filter items is defined by the
Form ([ABNF]): EQUALITY matching rule for the attribute type.
4.5.1.7.2 SearchRequest.filter.substrings
There SHALL be at most one 'initial', and at most one 'final' in the
'substrings' of a SubstringFilter. If 'initial' is present, it SHALL
be the first element of 'substrings'. If 'final' is present, it SHALL
be the last element of 'substrings'.
The matching rule for an AssertionValue in a substrings filter item
is defined by the SUBSTR matching rule for the attribute type. Note
that the AssertionValue in a substrings filter item conforms to the
assertion syntax of the EQUALITY matching rule for the attribute type
rather than the assertion syntax of the SUBSTR matching rule for the
attribute type. Conceptually, the entire SubstringFilter is converted
into an assertion value of the substrings matching rule prior to
applying the rule.
4.5.1.7.3 SearchRequest.filter.greaterOrEqual
The matching rule for the greaterOrEqual filter item is defined by
the ORDERING and EQUALITY matching rules for the attribute type.
4.5.1.7.4 SearchRequest.filter.lessOrEqual
The matching rule for the lessOrEqual filter item is defined by the
ORDERING matching rule for the attribute type.
4.5.1.7.5 SearchRequest.filter.present
Lightweight Directory Access Protocol Version 3
The present match evaluates to TRUE where there is an attribute or
subtype of the specified attribute description present in an entry,
and FALSE otherwise (including a presence test with an unrecognized
attribute description).
4.5.1.7.6 SearchRequest.filter.approxMatch
An approxMatch filter item evaluates to TRUE when there is a value of
the attribute or subtype for which some locally-defined approximate
matching algorithm (e.g. spelling variations, phonetic match, etc.)
returns TRUE. If an item matches for equality, it also satisfies an
approximate match. If approximate matching is not supported for the
attribute, this filter item should be treated as an equalityMatch.
4.5.1.7.7 SearchRequest.filter.extensibleMatch
The fields of the extensibleMatch filter item are evaluated as
follows:
- If the matchingRule field is absent, the type field MUST be
present, and an equality match is performed for that type.
- If the type field is absent and the matchingRule is present, the
matchValue is compared against all attributes in an entry which
support that matchingRule.
- If the type field is present and the matchingRule is present, the
matchValue is compared against entry attributes of the specified
type.
- If the dnAttributes field is set to TRUE, the match is
additionally applied against all the AttributeValueAssertions in
an entry's distinguished name, and evaluates to TRUE if there is
at least one attribute in the distinguished name for which the
filter item evaluates to TRUE. The dnAttributes field is present
to alleviate the need for multiple versions of generic matching
rules (such as word matching), where one applies to entries and
another applies to entries and DN attributes as well.
The matchingRule used for evaluation determines the syntax for the
assertion value. Once the matchingRule and attribute(s) have been
determined, the filter item evaluates to TRUE if it matches with at
least one attribute in the entry, FALSE if it does not match any
attribute in the entry, and Undefined if the matchingRule is not
recognized, the matchingRule is unsuitable for use with the specified
type, or the assertionValue is invalid.
4.5.1.7 SearchRequest.attributes
Lightweight Directory Access Protocol Version 3
A selection list of the attributes to be returned from each entry
which matches the search filter. LDAPString values of this field are
constrained to the following Augmented Backus-Naur Form ([ABNF]):
attributeSelector = attributedescription / selectorpecial attributeSelector = attributedescription / selectorpecial
selectorspecial = noattrs / alluserattrs selectorspecial = noattrs / alluserattrs
noattrs = %x31.2E.31 ; "1.1" noattrs = %x31.2E.31 ; "1.1"
alluserattrs = %x2A ; asterisk ("*") alluserattrs = %x2A ; asterisk ("*")
Lightweight Directory Access Protocol Version 3
The <attributedescription> production is defined in Section 2.5 of The <attributedescription> production is defined in Section 2.5 of
[Models]. [Models].
There are three special cases which may appear in the attributes There are three special cases which may appear in the attributes
selection list: selection list:
- an empty list with no attributes, - an empty list with no attributes,
- a list containing "*" (with zero or more attribute - a list containing "*" (with zero or more attribute
descriptions), and descriptions), and
skipping to change at line 1231 skipping to change at line 1282
A list containing "*" requests the return of all user attributes A list containing "*" requests the return of all user attributes
in addition to other listed (operational) attributes. in addition to other listed (operational) attributes.
A list containing only the OID "1.1" indicates that no attributes A list containing only the OID "1.1" indicates that no attributes
are to be returned. If "1.1" is provided with other are to be returned. If "1.1" is provided with other
attributeSelector values, the "1.1" attributeSelector is ignored. attributeSelector values, the "1.1" attributeSelector is ignored.
This OID was chosen because it does not (and can not) correspond This OID was chosen because it does not (and can not) correspond
to any attribute in use. to any attribute in use.
Client implementors should note that even if all user attributes Client implementors should note that even if all user attributes are
are requested, some attributes and/or attribute values of the requested, some attributes and/or attribute values of the entry may
entry may not be included in search results due to access controls not be included in Search results due to access controls or other
or other restrictions. Furthermore, servers will not return restrictions. Furthermore, servers will not return operational
operational attributes, such as objectClasses or attributeTypes, attributes, such as objectClasses or attributeTypes, unless they are
unless they are listed by name. Operational attributes are listed by name. Operational attributes are described in [Models].
described in [Models].
Attributes are returned at most once in an entry. If an attribute Attributes are returned at most once in an entry. If an attribute
description is named more than once in the list, the subsequent description is named more than once in the list, the subsequent names
names are ignored. If an attribute description in the list is not are ignored. If an attribute description in the list is not
recognized, it is ignored by the server. recognized, it is ignored by the server.
Note that an X.500 "list"-like operation can be emulated by the
client requesting a one-level LDAP search operation with a filter
checking for the presence of the 'objectClass' attribute, and that an
X.500 "read"-like operation can be emulated by a base object LDAP
search operation with the same filter. A server which provides a
gateway to X.500 is not required to use the Read or List operations,
although it may choose to do so, and if it does, it must provide the
same semantics as the X.500 search operation.
4.5.2. Search Result 4.5.2. Search Result
The results of the search operation are returned as zero or more The results of the Search operation are returned as zero or more
searchResultEntry messages, zero or more SearchResultReference SearchResultEntry and/or zero or more SearchResultReference messages,
messages, followed by a single searchResultDone message. followed by a single SearchResultDone message.
SearchResultEntry ::= [APPLICATION 4] SEQUENCE {
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
SearchResultEntry ::= [APPLICATION 4] SEQUENCE {
objectName LDAPDN, objectName LDAPDN,
attributes PartialAttributeList } attributes PartialAttributeList }
PartialAttributeList ::= SEQUENCE OF PartialAttributeList ::= SEQUENCE OF
partialAttribute PartialAttribute partialAttribute PartialAttribute
-- Note that the PartialAttributeList may hold zero elements. -- Note that the PartialAttributeList may hold zero elements.
-- This may happen when none of the attributes of an entry -- This may happen when none of the attributes of an entry
-- were requested, or could be returned. -- were requested, or could be returned.
-- Note also that the partialAttribute vals set may hold zero -- Note also that the partialAttribute vals set may hold zero
-- elements. This may happen when typesOnly is requested, access -- elements. This may happen when typesOnly is requested, access
-- controls prevent the return of values, or other reasons. -- controls prevent the return of values, or other reasons.
SearchResultReference ::= [APPLICATION 19] SEQUENCE SearchResultReference ::= [APPLICATION 19] SEQUENCE
SIZE (1..MAX) OF uri URI SIZE (1..MAX) OF uri URI
SearchResultDone ::= [APPLICATION 5] LDAPResult SearchResultDone ::= [APPLICATION 5] LDAPResult
Each SearchResultEntry represents an entry found during the search. Each SearchResultEntry represents an entry found during the Search.
Each SearchResultReference represents an area not yet explored during Each SearchResultReference represents an area not yet explored during
the search. The SearchResultEntry and SearchResultReference PDUs may the Search. The SearchResultEntry and SearchResultReference PDUs may
come in any order. Following all the SearchResultReference and come in any order. Following all the SearchResultReference and
SearchResultEntry responses, the server returns a SearchResultDone SearchResultEntry responses, the server returns a SearchResultDone
response, which contains an indication of success, or detailing any response, which contains an indication of success, or detailing any
errors that have occurred. errors that have occurred.
Each entry returned in a SearchResultEntry will contain all Each entry returned in a SearchResultEntry will contain all
appropriate attributes as specified in the attributes field of the appropriate attributes as specified in the attributes field of the
Search Request. Return of attributes is subject to access control and Search Request, 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 server's schema defines short names [Models] for an attribute If the server's schema defines short names [Models] for an attribute
type then the server SHOULD use one of those names in attribute type then the server SHOULD use one of those names in attribute
descriptions for that attribute type (in preference to using the descriptions for that attribute type (in preference to using the
<numericoid> [Models] format of the attribute type's object <numericoid> [Models] format of the attribute type's object
identifier). The server SHOULD NOT use the short name if that name is identifier). The server SHOULD NOT use the short name if that name is
known by the server to be ambiguous, or otherwise likely to cause known by the server to be ambiguous, or otherwise likely to cause
interoperability problems. interoperability problems.
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 one or more non-local entries, baseObject but was unable to search one or more non-local entries,
the server may return one or more SearchResultReference entries, each the server may return one or more SearchResultReference messages,
containing a reference to another set of servers for continuing the each containing a reference to another set of servers for continuing
operation. A server MUST NOT return any SearchResultReference if it the operation. A server MUST NOT return any SearchResultReference
has not located the baseObject and thus has not searched any entries; messages if it has not located the baseObject and thus has not
in this case it would return a SearchResultDone containing either a
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
referral or noSuchObject result code (depending on the server's searched any entries; in this case it would return a SearchResultDone
knowledge of the entry named in the baseObject). containing either a referral or noSuchObject result code (depending
on the server's knowledge of the entry named in the baseObject).
If a server holds a copy or partial copy of the subordinate naming If a server holds a copy or partial copy of the subordinate naming
context [Section 5 of Models], it may use the search filter to context (Section 5 of [Models]), it may use the search filter to
determine whether or not to return a SearchResultReference response. determine whether or not to return a SearchResultReference response.
Otherwise SearchResultReference responses are always returned when in Otherwise SearchResultReference responses are always returned when in
scope. scope.
The SearchResultReference is of the same data type as the Referral. The SearchResultReference is of the same data type as the Referral.
A URI for a server implementing LDAP and accessible via [TCP]/[IP] A URI for a server implementing LDAP and accessible via [TCP]/[IP]
(v4 or v6) is written as an LDAP URL according to [LDAPURL]. (v4 or v6) is written as an LDAP URL according to [LDAPURL].
In order to complete the search, the client issues a new search In order to complete the Search, the client issues a new Search
operation for each SearchResultReference that is returned. Note that operation for each SearchResultReference that is returned. Note that
the abandon operation described in Section 4.11 applies only to a the Abandon operation described in Section 4.11 applies only to a
particular operation sent on the LDAP exchange between a client and particular operation sent at the LDAP message layer between a client
server. The client must abandon subsequent search operations it and server. The client must abandon subsequent Search operations it
wishes to individually. wishes to individually.
Clients that follow search continuation references MUST ensure that Clients that follow search continuation references MUST ensure that
they do not loop between servers. They MUST NOT repeatedly contact they do not loop between servers. They MUST NOT repeatedly contact
the same server for the same request with the same target entry name, the same server for the same request with the same target entry name,
scope and filter. Some clients use a counter that is incremented each scope and filter. Some clients use a counter that is incremented each
time search result reference handling occurs for an operation, and time search result reference handling occurs for an operation, and
these kinds of clients MUST be able to handle at least ten nested these kinds of clients MUST be able to handle at least ten nested
search result references between the root and a leaf entry. search result references between the root and a leaf entry.
When an LDAP URL is used, the following instructions are followed: SearchResultReference values which are LDAP URLs follow these rules:
- The <dn> part of the URL MUST be present, with the new target - The <dn> part of the URL MUST be present, with the new target
object name. The client MUST use this name when following the object name. The client MUST use this name when following the
reference. UTF-8 encoded characters appearing in the string reference. UTF-8 encoded characters appearing in the string
representation of a DN or search filter may not be legal for URLs representation of a DN or search filter may not be legal for URLs
(e.g. spaces) and MUST be escaped using the % method in [URI]. (e.g. spaces) and MUST be escaped using the % method in [URI].
- Some servers (e.g. participating in distributed indexing) may - Some servers (e.g. participating in distributed indexing) may
provide a different filter in a URL of a SearchResultReference. provide a different filter in a URL of a SearchResultReference.
- If the <filter> part of the URL is present, the client MUST use - If the <filter> part of the URL is present, the client MUST use
this filter in its next request to progress this search, and if it this filter in its next request to progress this Search, and if it
is not present the client MUST use the same filter as it used for is not present the client MUST use the same filter as it used for
that search. that Search.
- If the originating search scope was singleLevel, the <scope> part - If the originating search scope was singleLevel, the <scope> part
of the URL will be "base". of the URL will be "base".
- It is RECOMMENDED that the <scope> part be present to avoid - It is RECOMMENDED that the <scope> part be present to avoid
ambiguity. ambiguity. In the absence of a <scope> part, the scope of the
original Search request is assumed.
- Other aspects of the new search request may be the same as or
different from the search request which generated the
SearchResultReference.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
- Other aspects of the new Search request may be the same as or
different from the Search request which generated the
SearchResultReference.
- The name of an unexplored subtree in a SearchResultReference need - The name of an unexplored subtree in a SearchResultReference need
not be subordinate to the base object. not be subordinate to the base object.
Other kinds of URIs may be returned. The syntax and semantics of such Other kinds of URIs may be returned. The syntax and semantics of such
URIs is left to future specifications. Clients may ignore URIs that URIs is left to future specifications. Clients may ignore URIs that
they do not support. they do not support.
4.5.3.1. Examples 4.5.3.1. Examples
For example, suppose the contacted server (hosta) holds the entry For example, suppose the contacted server (hosta) holds the entry
<DC=Example,DC=NET> and the entry <CN=Manager,DC=Example,DC=NET>. It <DC=Example,DC=NET> and the entry <CN=Manager,DC=Example,DC=NET>. It
knows that either LDAP-capable servers (hostb) or (hostc) hold knows that both LDAP servers (hostb) and (hostc) hold
<OU=People,DC=Example,DC=NET> (one is the master and the other server <OU=People,DC=Example,DC=NET> (one is the master and the other server
a shadow), and that LDAP-capable server (hostd) holds the subtree a shadow), and that LDAP-capable server (hostd) holds the subtree
<OU=Roles,DC=Example,DC=NET>. If a wholeSubtree search of <OU=Roles,DC=Example,DC=NET>. If a wholeSubtree 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??sub ldap://hostb/OU=People,DC=Example,DC=NET??sub
ldap://hostc/OU=People,DC=Example,DC=NET??sub } ldap://hostc/OU=People,DC=Example,DC=NET??sub }
SearchResultReference { SearchResultReference {
ldap://hostd/OU=Roles,DC=Example,DC=NET??sub } ldap://hostd/OU=Roles,DC=Example,DC=NET??sub }
SearchResultDone (success) SearchResultDone (success)
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 request 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??sub } ldap://hoste/OU=Managers,OU=People,DC=Example,DC=NET??sub }
SearchResultReference { SearchResultReference {
ldap://hostf/OU=Consultants,OU=People,DC=Example,DC=NET??sub } ldap://hostf/OU=Consultants,OU=People,DC=Example,DC=NET??sub }
SearchResultDone (success) SearchResultDone (success)
Similarly, if a singleLevel search of <DC=Example,DC=NET> is Similarly, if a singleLevel Search of <DC=Example,DC=NET> is
requested to the contacted server, it may return the following: requested to the contacted server, it may return the following:
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??base ldap://hostb/OU=People,DC=Example,DC=NET??base
ldap://hostc/OU=People,DC=Example,DC=NET??base } ldap://hostc/OU=People,DC=Example,DC=NET??base }
SearchResultReference { SearchResultReference {
ldap://hostd/OU=Roles,DC=Example,DC=NET??base } ldap://hostd/OU=Roles,DC=Example,DC=NET??base }
SearchResultDone (success)
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
If the contacted server does not hold the base object for the search, SearchResultDone (success)
If the contacted server does not hold the base object for the Search,
but has knowledge of its possible location, then it may return a but has knowledge of its possible location, then it may return a
referral to the client. In this case, if the client requests a referral to the client. In this case, if the client requests a
subtree search of <DC=Example,DC=ORG> to hosta, the server returns a subtree Search of <DC=Example,DC=ORG> to hosta, the server returns a
SearchResultDone containing a referral. SearchResultDone containing a referral.
SearchResultDone (referral) { SearchResultDone (referral) {
ldap://hostg/DC=Example,DC=ORG??sub } ldap://hostg/DC=Example,DC=ORG??sub }
4.6. Modify Operation 4.6. Modify Operation
The Modify Operation allows a client to request that a modification The Modify operation allows a client to request that a modification
of an entry be performed on its behalf by a server. The Modify of an entry be performed on its behalf by a server. The Modify
Request is defined as follows: Request is defined as follows:
ModifyRequest ::= [APPLICATION 6] SEQUENCE { ModifyRequest ::= [APPLICATION 6] SEQUENCE {
object LDAPDN, object LDAPDN,
changes SEQUENCE OF change SEQUENCE { changes SEQUENCE OF change SEQUENCE {
operation ENUMERATED { operation ENUMERATED {
add (0), add (0),
delete (1), delete (1),
replace (2) }, replace (2),
... },
modification PartialAttribute } } modification PartialAttribute } }
Fields of the Modify Request are: Fields of the Modify Request are:
- object: The name of the object to be modified. The value of this - object: The value of this field contains the name of the entry to
field contains the DN of the entry to be modified. The server be modified. The server SHALL NOT perform any alias dereferencing
SHALL NOT perform any alias dereferencing in determining the in determining the object to be modified.
object to be modified.
- changes: A list of modifications to be performed on the entry. The - changes: A list of modifications to be performed on the entry. The
entire list of modifications MUST be performed in the order they entire list of modifications MUST be performed in the order they
are listed as a single atomic operation. While individual are listed as a single atomic operation. While individual
modifications may violate certain aspects of the directory schema modifications may violate certain aspects of the directory schema
(such as the object class definition and DIT content rule), the (such as the object class definition and DIT content rule), 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 model performed MUST conform to the requirements of the directory model
and controlling schema [Models]. and controlling schema [Models].
- operation: Used to specify the type of modification being - operation: Used to specify the type of modification being
performed. Each operation type acts on the following performed. Each operation type acts on the following
modification. The values of this field have the following modification. The values of this field have the following
semantics respectively: semantics respectively:
add: add values listed to the modification attribute, add: add values listed to the modification attribute,
creating the attribute if necessary; creating the attribute if necessary;
delete: delete values listed from the modification attribute, delete: delete values listed from the modification attribute.
removing the entire attribute if no values are listed, or if If no values are listed, or if all current values of the
all current values of the attribute are listed for deletion; attribute are listed, the entire attribute is removed;
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
replace: replace all existing values of the modification replace: replace all existing values of the modification
attribute with the new values listed, creating the attribute attribute with the new values listed, creating the attribute
if it did not already exist. A replace with no value will if it did not already exist. A replace with no value will
delete the entire attribute if it exists, and is ignored if delete the entire attribute if it exists, and is ignored if
the attribute does not exist. the attribute does not exist.
- modification: A PartialAttribute (which may have an empty SET - modification: A PartialAttribute (which may have an empty SET
skipping to change at line 1506 skipping to change at line 1548
ModifyResponse ::= [APPLICATION 7] LDAPResult ModifyResponse ::= [APPLICATION 7] LDAPResult
The server will return to the client a single Modify Response The server will return to the client a single Modify Response
indicating either the successful completion of the DIT modification, indicating either the successful completion of the DIT modification,
or the reason that the modification failed. Due to the requirement or the reason that the modification failed. Due to the requirement
for atomicity in applying the list of modifications in the Modify for atomicity in applying the list of modifications in the Modify
Request, the client may expect that no modifications of the DIT have Request, the client may expect that no modifications of the DIT have
been performed if the Modify Response received indicates any sort of been performed if the Modify Response received indicates any sort of
error, and that all requested modifications have been performed if error, and that all requested modifications have been performed if
the Modify Response indicates successful completion of the Modify the Modify Response indicates successful completion of the Modify
Operation. The result of the modification is indeterminate if the operation. Whether the modification was applied or not cannot be
Modify Response is not received (e.g. the LDA exchange is terminated determined by the client if the Modify Response was not received
or the Modify Operation is abandoned). (e.g. the LDAP session was terminated or the Modify operation was
abandoned).
The Modify Operation cannot be used to remove from an entry any of Servers MUST ensure that entries conform to user and system schema
its distinguished values, i.e. those values which form the entry's rules or other data model constraints. The Modify operation cannot be
relative distinguished name. An attempt to do so will result in the used to remove from an entry any of its distinguished values, i.e.
server returning the notAllowedOnRDN result code. The Modify DN those values which form the entry's relative distinguished name. An
Operation described in Section 4.9 is used to rename an entry. attempt to do so will result in the server returning the
notAllowedOnRDN result code. The Modify DN operation described in
Section 4.9 is used to rename an entry.
For attribute types which specify no equality matching, the rules in
Section 2.5.1 of [Models] are followed.
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 changes in an LDAP ModifyRequest onto the direct mapping of the changes in an LDAP ModifyRequest onto the
changes of a DAP ModifyEntry operation, and different implementations changes of a DAP ModifyEntry operation, and different implementations
of LDAP-DAP gateways may use different means of representing the of LDAP-DAP gateways may use different means of representing the
change. If successful, the final effect of the operations on the change. If successful, the final effect of the operations on the
entry MUST be identical. 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:
Lightweight Directory Access Protocol Version 3
AddRequest ::= [APPLICATION 8] SEQUENCE { AddRequest ::= [APPLICATION 8] SEQUENCE {
entry LDAPDN, entry LDAPDN,
attributes AttributeList } attributes AttributeList }
AttributeList ::= SEQUENCE OF attribute Attribute AttributeList ::= SEQUENCE OF attribute Attribute
Fields of the Add Request are: Fields of the Add Request are:
Lightweight Directory Access Protocol Version 3
- entry: the name of the entry to be added. The server SHALL NOT - entry: the name of the entry to be added. The server SHALL NOT
dereference any aliases in locating the entry to be added. dereference any aliases in locating the entry to be added.
- attributes: the list of attributes that, along with those from the - attributes: the list of attributes that, along with those from the
RDN, make up the content of the entry being added. Clients MAY or RDN, make up the content of the entry being added. Clients MAY or
MAY NOT include the RDN attribute in this list. Clients MUST MAY NOT include the RDN attribute(s) in this list. Clients MUST
include the 'objectClass' attribute, and values of any mandatory NOT supply NO-USER-MODIFICATION attributes such as the
attributes of the listed object classes. Clients MUST NOT supply createTimestamp or creatorsName attributes, since the server
NO-USER-MODIFICATION attributes such as the createTimestamp or maintains these automatically.
creatorsName attributes, since the server maintains these
automatically. Servers MUST ensure that entries conform to user and system schema
rules or other data model constraints. For attribute types which
specify no equality matching, the rules in Section 2.5.1 of [Models]
are followed (this applies to the naming attribute in addition to any
multi-valued attributes being added).
The entry named in the entry field of the AddRequest MUST NOT exist The entry named in the entry field of the AddRequest MUST NOT exist
for the AddRequest to succeed. The immediate superior (parent) of an for the AddRequest to succeed. The immediate superior (parent) of an
object or alias entry to be added MUST exist. For example, if the object or alias entry to be added MUST exist. For example, if the
client attempted to add <CN=JS,DC=Example,DC=NET>, the client attempted to add <CN=JS,DC=Example,DC=NET>, the
<DC=Example,DC=NET> entry did not exist, and the <DC=NET> entry did <DC=Example,DC=NET> entry did not exist, and the <DC=NET> entry did
exist, then the server would return the noSuchObject result code with exist, then the server would return the noSuchObject result code with
the matchedDN field containing <DC=NET>. the matchedDN field containing <DC=NET>.
Server implementations SHOULD NOT restrict where entries can be
located in the Directory unless DIT structure rules are in place.
Some servers allow the administrator to restrict the classes of
entries which can be added to the Directory.
Upon receipt of an Add Request, a server will attempt to add the Upon receipt of an Add Request, a server will attempt to add the
requested entry. The result of the add attempt will be returned to requested entry. The result of the Add attempt will be returned to
the client in the Add Response, defined as follows: the client in the Add Response, defined as follows:
AddResponse ::= [APPLICATION 9] LDAPResult AddResponse ::= [APPLICATION 9] LDAPResult
A response of success indicates that the new entry has been added to A response of success indicates that the new entry has been added to
the Directory. the 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
The Delete Request consists of the name of the entry to be deleted. The Delete Request consists of the name of the entry to be deleted.
The server SHALL NOT dereference aliases while resolving the name of The server SHALL NOT dereference aliases while resolving the name of
the target entry to be removed. the target entry to be removed.
Lightweight Directory Access Protocol Version 3
Only leaf entries (those with no subordinate entries) can be deleted Only leaf entries (those with no subordinate entries) can be deleted
with this operation. with this operation.
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 and return the result in the Delete the entry removal requested and return the result in the Delete
Response defined as follows: Response defined as follows:
Lightweight Directory Access Protocol Version 3
DelResponse ::= [APPLICATION 11] LDAPResult DelResponse ::= [APPLICATION 11] LDAPResult
4.9. Modify DN Operation 4.9. Modify DN Operation
The Modify DN Operation allows a client to change the Relative The Modify DN operation allows a client to change the Relative
Distinguished Name (RDN) of an entry in the Directory, and/or to move Distinguished Name (RDN) of an entry in the Directory, and/or to move
a subtree of entries to a new location in the Directory. The Modify a subtree of entries to a new location in the Directory. The Modify
DN Request is defined as follows: 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 }
Fields of the Modify DN Request are: Fields of the Modify DN Request are:
- entry: the name of the entry to be changed. This entry may or may - entry: the name of the entry to be changed. This entry may or may
not have subordinate entries. not have subordinate entries.
- newrdn: the new RDN of the entry. If the operation moves the entry - newrdn: the new RDN of the entry. The value of the old RDN is
to a new superior without changing its RDN, the value of the old supplied when moving the entry to a new superior without changing
RDN is supplied for this parameter. its RDN. Attribute values of the new RDN not matching any
Attribute values of the new RDN not matching any attribute value attribute value of the entry are added to the entry and an
of the entry are added to the entry and an appropriate error is appropriate error is returned if this fails.
returned if this fails.
- deleteoldrdn: a boolean field that controls whether the old RDN - deleteoldrdn: a boolean field that controls whether the old RDN
attribute values are to be retained as attributes of the entry, or attribute values are to be retained as attributes of the entry, or
deleted from the entry. deleted from the entry.
- newSuperior: if present, this is the name of an existing object - newSuperior: if present, this is the name of an existing object
entry which becomes the immediate superior (parent) of the entry which becomes the immediate superior (parent) of the
existing entry. existing entry.
The server SHALL NOT dereference any aliases in locating the objects The server SHALL NOT dereference any aliases in locating the objects
skipping to change at line 1639 skipping to change at line 1685
Upon receipt of a ModifyDNRequest, a server will attempt to perform Upon receipt of a ModifyDNRequest, a server will attempt to perform
the name change and return the result in the Modify DN Response, the name change and return the result in the Modify DN Response,
defined as follows: defined as follows:
ModifyDNResponse ::= [APPLICATION 13] LDAPResult ModifyDNResponse ::= [APPLICATION 13] LDAPResult
For example, if the entry named in the entry field was <cn=John For example, if the entry named in the entry field was <cn=John
Smith,c=US>, the newrdn field was <cn=John Cougar Smith>, and the Smith,c=US>, the newrdn field was <cn=John Cougar Smith>, and the
newSuperior field was absent, then this operation would attempt to newSuperior field was absent, then this operation would attempt to
Lightweight Directory Access Protocol Version 3
rename the entry to be <cn=John Cougar Smith,c=US>. If there was rename the entry to be <cn=John Cougar Smith,c=US>. If there was
already an entry with that name, the operation would fail with the already an entry with that name, the operation would fail with the
entryAlreadyExists result code. entryAlreadyExists result code.
Servers MUST ensure that entries conform to user and system schema
rules or other data model constraints. For attribute types which
specify no equality matching, the rules in Section 2.5.1 of [Models]
are followed (this pertains to newrdn and deleteoldrdn).
The object named in newSuperior MUST exist. For example, if the The object named in newSuperior MUST exist. For example, if the
client attempted to add <CN=JS,DC=Example,DC=NET>, the client attempted to add <CN=JS,DC=Example,DC=NET>, the
Lightweight Directory Access Protocol Version 3
<DC=Example,DC=NET> entry did not exist, and the <DC=NET> entry did <DC=Example,DC=NET> entry did not exist, and the <DC=NET> entry did
exist, then the server would return the noSuchObject result code with exist, then the server would return the noSuchObject result code with
the matchedDN field containing <DC=NET>. the matchedDN field containing <DC=NET>.
If the deleteoldrdn field is TRUE, the attribute values forming the If the deleteoldrdn field is TRUE, the attribute values forming the
old RDN but not the new RDN are deleted from the entry. If the old RDN but not the new RDN are deleted from the entry. If the
deleteoldrdn field is FALSE, the attribute values forming the old RDN deleteoldrdn field is FALSE, the attribute values forming the old RDN
will be retained as non-distinguished attribute values of the entry. will be retained as non-distinguished attribute values of the entry.
The server MUST fail the operation and return an error in the result
code if the setting of the deleteoldrdn field would cause a schema
inconsistency in the entry.
Note that X.500 restricts the ModifyDN operation to only affect Note that X.500 restricts the ModifyDN operation to only affect
entries that are contained within a single server. If the LDAP server entries that are contained within a single server. If the LDAP server
is mapped onto DAP, then this restriction will apply, and the is mapped onto DAP, then this restriction will apply, and the
affectsMultipleDSAs result code will be returned if this error affectsMultipleDSAs result code will be returned if this error
occurred. In general, clients MUST NOT expect to be able to perform occurred. In general, clients MUST NOT expect to be able to perform
arbitrary movements of entries and subtrees between servers or arbitrary movements of entries and subtrees between servers or
between naming contexts. between naming contexts.
4.10. Compare Operation 4.10. Compare Operation
The Compare Operation allows a client to compare an assertion value The Compare operation allows a client to compare an assertion value
with the values of a particular attribute in a particular entry in with the values of a particular attribute in a particular entry in
the Directory. The Compare Request is defined as follows: the Directory. The Compare Request is defined as follows:
CompareRequest ::= [APPLICATION 14] SEQUENCE { CompareRequest ::= [APPLICATION 14] SEQUENCE {
entry LDAPDN, entry LDAPDN,
ava AttributeValueAssertion } ava AttributeValueAssertion }
Fields of the Compare Request are: Fields of the Compare Request are:
- entry: the name of the entry to be compared. The server SHALL NOT - entry: the name of the entry to be compared. The server SHALL NOT
dereference any aliases in locating the entry to be compared. dereference any aliases in locating the entry to be compared.
- ava: holds the attribute value assertion to be compared. - ava: holds the attribute value assertion to be compared.
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 and return the result in the Compare the requested comparison and return the result in the Compare
Response, defined as follows: Response, defined as follows:
CompareResponse ::= [APPLICATION 15] LDAPResult CompareResponse ::= [APPLICATION 15] LDAPResult
The resultCode field is set to compareTrue, compareFalse, or an The resultCode is set to compareTrue, compareFalse, or an appropriate
appropriate error. compareTrue indicates that the assertion value in error. compareTrue indicates that the assertion value in the ava
the ava field matches a value of the attribute or subtype according
to the attribute's EQUALITY matching rule. compareFalse indicates
that the assertion value in the ava field and the values of the
attribute or subtype did not match. Other result codes indicate
either that the result of the comparison was Undefined (Section
4.5.1), or that some error occurred.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
field matches a value of the attribute or subtype according to the
attribute's EQUALITY matching rule. compareFalse indicates that the
assertion value in the ava field and the values of the attribute or
subtype did not match. Other result codes indicate either that the
result of the comparison was Undefined (Section 4.5.1), or that some
error occurred.
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 interrogated by other means. 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 uncompleted operation. The Abandon Request that the server abandon an uncompleted operation. The Abandon Request
is defined as follows: is defined as follows:
AbandonRequest ::= [APPLICATION 16] MessageID AbandonRequest ::= [APPLICATION 16] MessageID
The MessageID is that of an operation which was requested earlier in The MessageID is that of an operation which was requested earlier at
this LDAP exchange. The abandon request itself has its own MessageID. this LDAP message layer. The Abandon request itself has its own
This is distinct from the MessageID of the earlier operation being MessageID. This is distinct from the MessageID of the earlier
abandoned. operation being abandoned.
There is no response defined in the Abandon operation. Upon receipt There is no response defined in the Abandon operation. Upon receipt
of an AbandonRequest, the server MAY abandon the operation identified of an AbandonRequest, the server MAY abandon the operation identified
by the MessageID. Since the client cannot tell the difference between by the MessageID. Since the client cannot tell the difference between
a successfully abandoned operation and an uncompleted operation, the a successfully abandoned operation and an uncompleted operation, the
application of the Abandon operation is limited to uses where the application of the Abandon operation is limited to uses where the
client does not require an indication of its outcome. client does not require an indication of its outcome.
Abandon, Bind, Unbind, and StartTLS operations cannot be abandoned. Abandon, Bind, Unbind, and StartTLS operations cannot be abandoned.
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
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.
The ability to abandon other (particularly update) operations is at The ability to abandon other (particularly update) operations is at
the discretion of the server. the discretion of the server.
Clients should not send abandon requests for the same operation Clients should 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).
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.
Lightweight Directory Access Protocol Version 3
4.12. Extended Operation 4.12. Extended Operation
The extended operation allows additional operations to be defined for The Extended operation allows additional operations to be defined for
services not already available in the protocol. For example, to add services not already available in the protocol. For example, to Add
operations to install transport layer security (see Section 4.14). operations to install transport layer security (see Section 4.14).
Lightweight Directory Access Protocol Version 3 The Extended operation allows clients to make requests and receive
The extended operation allows clients to make requests and receive
responses with predefined syntaxes and semantics. These may be responses with predefined syntaxes and semantics. These may be
defined in RFCs or be private to particular implementations. defined in RFCs or be private to particular implementations.
Each extended operation consists of an extended request and an Each Extended operation consists of an Extended request and an
extended response. Extended response.
ExtendedRequest ::= [APPLICATION 23] SEQUENCE { ExtendedRequest ::= [APPLICATION 23] SEQUENCE {
requestName [0] LDAPOID, requestName [0] LDAPOID,
requestValue [1] OCTET STRING OPTIONAL } requestValue [1] OCTET STRING OPTIONAL }
The requestName is a dotted-decimal representation of the unique The requestName is a dotted-decimal representation of the unique
OBJECT IDENTIFIER corresponding to the request. The requestValue is OBJECT IDENTIFIER corresponding to the request. The requestValue is
information in a form defined by that request, encapsulated inside an information in a form defined by that request, encapsulated inside an
OCTET STRING. OCTET STRING.
skipping to change at line 1784 skipping to change at line 1833
ExtendedResponse ::= [APPLICATION 24] SEQUENCE { ExtendedResponse ::= [APPLICATION 24] SEQUENCE {
COMPONENTS OF LDAPResult, COMPONENTS OF LDAPResult,
responseName [10] LDAPOID OPTIONAL, responseName [10] LDAPOID OPTIONAL,
responseValue [11] OCTET STRING OPTIONAL } responseValue [11] OCTET STRING OPTIONAL }
The responseName is typically not required to be present as the The responseName is typically not required to be present as the
syntax and semantics of the response (including the format of the syntax and semantics of the response (including the format of the
responseValue) is implicitly known and associated with the request by responseValue) is implicitly known and associated with the request by
the messageID. the messageID.
If the extended operation associated with the requestName is not If the Extended operation associated with the requestName is not
supported by the server, the server MUST NOT provide a responseName supported by the server, the server MUST NOT provide a responseName
nor a responseValue and MUST return a resultCode of protocolError. nor a responseValue and MUST return with resultCode set to
protocolError.
The requestValue and responseValue fields contain any information The requestValue and responseValue fields contain any information
associated with the operation. The format of these fields is defined associated with the operation. The format of these fields is defined
by the specification of the extended operation. Implementations MUST by the specification of the Extended operation. Implementations MUST
be prepared to handle arbitrary contents of these fields, including be prepared to handle arbitrary contents of these fields, including
zero bytes. Values that are defined in terms of ASN.1 and BER encoded zero bytes. Values that are defined in terms of ASN.1 and BER encoded
according to Section 5.2, also follow the extensibility rules in according to Section 5.1, also follow the extensibility rules in
Section 4. Section 4.
Servers list the requestName of Extended Requests they recognize in Servers list the requestName of Extended Requests they recognize in
the 'supportedExtension' attribute in the root DSE (Section 5.1 of the 'supportedExtension' attribute in the root DSE (Section 5.1 of
[Models]). [Models]).
Extended operations may be specified in other documents. The Extended operations may be specified in other documents. The
specification of an extended operation consists of: specification of an Extended operation consists of:
Lightweight Directory Access Protocol Version 3
- the OBJECT IDENTIFIER assigned to the requestName, - the OBJECT IDENTIFIER assigned to the requestName,
- the OBJECT IDENTIFIER (if any) assigned to the responseName (note - the OBJECT IDENTIFIER (if any) assigned to the responseName (note
that the same OBJECT IDENTIFIER my be used for both the that the same OBJECT IDENTIFIER my be used for both the
requestName and responseName), requestName and responseName),
Lightweight Directory Access Protocol Version 3
- the format of the contents of the requestValue and responseValue - the format of the contents of the requestValue and responseValue
(if any), and (if any), and
- the semantics of the operation. - the semantics of the operation.
4.13. IntermediateResponse Message 4.13. IntermediateResponse Message
While the Search operation provides a mechanism to return multiple While the Search operation provides a mechanism to return multiple
response messages for a single search request, other operations, by response messages for a single Search request, other operations, by
nature, do not provide for multiple response messages. nature, do not provide for multiple response messages.
The IntermediateResponse message provides a general mechanism for The IntermediateResponse message provides a general mechanism for
defining single-request/multiple-response operations in LDAP. This defining single-request/multiple-response operations in LDAP. This
message is intended to be used in conjunction with the extended message is intended to be used in conjunction with the Extended
operation to define new single-request/multiple-response operations operation to define new single-request/multiple-response operations
or in conjunction with a control when extending existing LDAP or in conjunction with a control when extending existing LDAP
operations in a way that requires them to return intermediate operations in a way that requires them to return Intermediate
response information. response information.
It is intended that the definitions and descriptions of extended It is intended that the definitions and descriptions of Extended
operations and controls that make use of the IntermediateResponse operations and controls that make use of the IntermediateResponse
message will define the circumstances when an IntermediateResponse message will define the circumstances when an IntermediateResponse
message can be sent by a server and the associated meaning of an message can be sent by a server and the associated meaning of an
IntermediateResponse message sent in a particular circumstance. IntermediateResponse message sent in a particular circumstance.
IntermediateResponse ::= [APPLICATION 25] SEQUENCE { IntermediateResponse ::= [APPLICATION 25] SEQUENCE {
responseName [0] LDAPOID OPTIONAL, responseName [0] LDAPOID OPTIONAL,
responseValue [1] OCTET STRING OPTIONAL } responseValue [1] OCTET STRING OPTIONAL }
IntermediateResponse messages SHALL NOT be returned to the client IntermediateResponse messages SHALL NOT be returned to the client
unless the client issues a request that specifically solicits their unless the client issues a request that specifically solicits their
return. This document defines two forms of solicitation: extended return. This document defines two forms of solicitation: Extended
operation and request control. IntermediateResponse messages are operation and request control. IntermediateResponse messages are
specified in documents describing the manner in which they are specified in documents describing the manner in which they are
solicited (i.e. in the extended operation or request control solicited (i.e. in the Extended operation or request control
specification that uses them). These specifications include: specification that uses them). These specifications include:
- the OBJECT IDENTIFIER (if any) assigned to the responseName, - the OBJECT IDENTIFIER (if any) assigned to the responseName,
- the format of the contents of the responseValue, and - the format of the contents of the responseValue (if any), and
- the semantics associated with the IntermediateResponse message. - the semantics associated with the IntermediateResponse message.
Extensions that allow the return of multiple types of Extensions that allow the return of multiple types of
IntermediateResponse messages SHALL identify those types using unique IntermediateResponse messages SHALL identify those types using unique
responseName values (note that one of these may specify no value). responseName values (note that one of these may specify no value).
Lightweight Directory Access Protocol Version 3
Sections 4.13.1 and 4.13.2 describe additional requirements on the Sections 4.13.1 and 4.13.2 describe additional requirements on the
inclusion of responseName and responseValue in IntermediateResponse inclusion of responseName and responseValue in IntermediateResponse
messages. messages.
4.13.1. Usage with LDAP ExtendedRequest and ExtendedResponse 4.13.1. Usage with LDAP ExtendedRequest and ExtendedResponse
Lightweight Directory Access Protocol Version 3
A single-request/multiple-response operation may be defined using a A single-request/multiple-response operation may be defined using a
single ExtendedRequest message to solicit zero or more single ExtendedRequest message to solicit zero or more
IntermediateResponse messages of one or more kinds followed by an IntermediateResponse messages of one or more kinds followed by an
ExtendedResponse message. ExtendedResponse message.
4.13.2. Usage with LDAP Request Controls 4.13.2. Usage with LDAP Request Controls
A control's semantics may include the return of zero or more A control's semantics may include the return of zero or more
IntermediateResponse messages prior to returning the final result IntermediateResponse messages prior to returning the final result
code for the operation. One or more kinds of IntermediateResponse code for the operation. One or more kinds of IntermediateResponse
skipping to change at line 1887 skipping to change at line 1937
All IntermediateResponse messages associated with request controls All IntermediateResponse messages associated with request controls
SHALL include a responseName. This requirement ensures that the SHALL include a responseName. This requirement ensures that the
client can correctly identify the source of IntermediateResponse client can correctly identify the source of IntermediateResponse
messages when: messages when:
- two or more controls using IntermediateResponse messages are - two or more controls using IntermediateResponse messages are
included in a request for any LDAP operation or included in a request for any LDAP operation or
- one or more controls using IntermediateResponse messages are - one or more controls using IntermediateResponse messages are
included in a request with an LDAP extended operation that uses included in a request with an LDAP Extended operation that uses
IntermediateResponse messages. IntermediateResponse messages.
4.14. StartTLS Operation 4.14. StartTLS Operation
The Start Transport Layer Security (StartTLS) operations purpose is The Start Transport Layer Security (StartTLS) operation's purpose is
to initiate installation of a TLS layer. The StartTLS operation is to initiate installation of a TLS layer. The StartTLS operation is
defined using the extended operation mechanism described in Section defined using the Extended operation mechanism described in Section
4.12. 4.12.
4.14.1. StartTLS Request 4.14.1. StartTLS Request
A client requests TLS establishment by transmitting a StartTLS A client requests TLS establishment by transmitting a StartTLS
request PDU to the server. The StartTLS request is defined in terms request PDU to the server. The StartTLS 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 always absent. and the requestValue field is always absent.
The client MUST NOT send any PDUs on this LDAP exchange following The client MUST NOT send any PDUs at this LDAP message layer
this request until it receives a StartTLS extended response and, in following this request until it receives a StartTLS Extended response
the case of a successful response, completes TLS negotiations. and, in the case of a successful response, completes TLS
negotiations.
Sequencing problems (particularly those detailed in Section 3.1.1 of Lightweight Directory Access Protocol Version 3
[AuthMeth] result in an operationsError being returned in the
resultCode.
If the server does not support TLS (whether by design or by current Detected sequencing problems (particularly those detailed in Section
configuration), it returns the protocolError resultCode as described 3.1.1 of [AuthMeth]) result in the resultCode being set to
in Section 4.12. operationsError.
Lightweight Directory Access Protocol Version 3 If the server does not support TLS (whether by design or by current
configuration), it returns with the resultCode set to protocolError
as described in Section 4.12.
4.14.2. StartTLS Response 4.14.2. StartTLS Response
When a StartTLS request is made, servers supporting the operation When a StartTLS request is made, servers supporting the operation
MUST return a StartTLS response PDU to the requestor. The MUST return a StartTLS response PDU to the requestor. The
responseName, if present, is also "1.3.6.1.4.1.1466.20037". The responseName, if present, is also "1.3.6.1.4.1.1466.20037". The
responseValue is absent. responseValue is absent.
If the server is willing and able to negotiate TLS, it returns a If the server is willing and able to negotiate TLS, it returns with
success resultCode. Refer to Section 4 of [AuthMeth] for details. the resultCode set to success. Refer to Section 4 of [AuthMeth] for
details.
If the server is otherwise unwilling or unable to perform this If the server is otherwise unwilling or unable to perform this
operation, the server is to return an appropriate result code operation, the server is to return an appropriate result code
indicating the nature of the problem. For example, if the TLS indicating the nature of the problem. For example, if the TLS
subsystem is not presently available, the server may return indicate subsystem is not presently available, the server may indicate so by
so by returning the unavailable resultCode. returning with the resultCode set to unavailable.
4.14.3. Removal of the TLS Layer 4.14.3. Removal of the TLS Layer
Two forms of TLS layer removal -- graceful and abrupt -- are Two forms of TLS layer removal -- graceful and abrupt -- are
provided. These do not involve LDAP PDUs, but are preformed at the provided. These do not involve LDAP PDUs, but are preformed at the
underlying layers. underlying layers.
If the connection is closed, uncompleted operations are handled as If the transport connection is closed, uncompleted operations are
specified in Section 5.1. handled as specified in Section 5.1.
4.14.3.1. Graceful Removal 4.14.3.1. Graceful Removal
Either the client or server MAY remove the TLS layer and leave the Either the client or server MAY remove the TLS layer and leave the
LDAP exchange intact by sending and receiving a TLS closure alert. LDAP message layer intact by sending and receiving a TLS closure
alert.
The initiating protocol peer sends the TLS closure alert. If it The initiating protocol peer sends the TLS closure alert. If it
wishes to leave the LDAP exchange intact, it then MUST cease to send wishes to leave the LDAP message layer intact, it then MUST cease to
further PDUs and MUST ignore any received LDAP PDUs until it receives send further PDUs and MUST ignore any received LDAP PDUs until it
a TLS closure alert from the other peer. receives a TLS closure alert from the other peer.
Once the initiating protocol peer receives a TLS closure alert from Once the initiating protocol peer receives a TLS closure alert from
the other peer it MAY send and receive LDAP PDUs. the other peer it MAY send and receive LDAP PDUs.
Lightweight Directory Access Protocol Version 3
When a protocol peer receives the initial TLS closure alert, it may When a protocol peer receives the initial TLS closure alert, it may
choose to allow the LDAP exchange to remain intact. In this case, it choose to allow the LDAP message layer to remain intact. In this
MUST immediately transmit a TLS closure alert. Following this, it MAY case, it MUST immediately transmit a TLS closure alert. Following
send and receive LDAP PDUs. this, it MAY send and receive LDAP PDUs.
Protocol peers MAY close the connection after sending or receiving a Protocol peers MAY close the transport connection after sending or
TLS closure alert. receiving a TLS closure alert.
After the TLS layer has been removed, the server MUST NOT send After the TLS layer has been removed, the server MUST NOT send
responses to any request message received before the TLS closure responses to any request message received before the TLS closure
Lightweight Directory Access Protocol Version 3
alert. Thus, clients wishing to receive responses to messages sent alert. Thus, clients wishing to receive responses to messages sent
while the TLS layer is intact MUST wait for those message responses while the TLS layer is intact MUST wait for those message responses
before sending the TLS closure alert. before sending the TLS closure alert.
4.14.3.2. Abrupt Removal 4.14.3.2. Abrupt Removal
Either the client or server MAY abruptly remove the TLS layer by Either the client or server MAY abruptly remove the TLS layer by
closing the connection. In this circumstance, a server MAY send the closing the transport connection. In this circumstance, a server MAY
client a Notice of Disconnection before closing the connection. send the client a Notice of Disconnection before closing the
transport connection.
5. Protocol Encoding, Connection, and Transfer 5. Protocol Encoding, Connection, and Transfer
This protocol is designed to run over connection-oriented, reliable This protocol is designed to run over connection-oriented, reliable
transports, where the data stream is divided into octets (8-bit transports, where the data stream is divided into octets (8-bit
units), with each octet and each bit being significant. units), with each octet and each bit being significant.
One underlying service, LDAP over TCP, is defined in Section One underlying service, LDAP over TCP, is defined in Section
5.3. This service is generally applicable to applications providing 5.2. This service is generally applicable to applications providing
or consuming X.500-based directory services on the Internet. This or consuming X.500-based directory services on the Internet. This
specification was generally written with the TCP mapping in mind. specification was generally written with the TCP mapping in mind.
Specifications detailing other mappings may encounter various Specifications detailing other mappings may encounter various
obstacles. obstacles.
Implementations of LDAP over TCP MUST implement the mapping as Implementations of LDAP over TCP MUST implement the mapping as
described in Section 5.3. described in Section 5.2.
This table illustrates the relationship between the different layers This table illustrates the relationship between the different layers
involved in an exchange between two protocol peers: involved in an exchange between two protocol peers:
+---------------+ +----------------------+
| LDAP exchange | | LDAP message layer |
+---------------+ > LDAP PDUs +----------------------+ > LDAP PDUs
+---------------+ < data +----------------------+ < data
| SASL layer | | SASL layer |
+---------------+ > SASL-protected data +----------------------+ > SASL-protected data
+---------------+ < data +----------------------+ < data
| TLS layer | | TLS layer |
Application +---------------+ > TLS-protected data Application +----------------------+ > TLS-protected data
------------+---------------+ < data ------------+----------------------+ < data
Transport | connection | Transport | transport connection |
+---------------+
5.2. Protocol Encoding Lightweight Directory Access Protocol Version 3
+----------------------+
5.1. Protocol Encoding
The protocol elements of LDAP SHALL be encoded for exchange using the The protocol elements of LDAP SHALL be encoded for exchange using the
Basic Encoding Rules [BER] of [ASN.1] with the following Basic Encoding Rules [BER] of [ASN.1] with the following
restrictions: restrictions:
- Only the definite form of length encoding is used. - Only the definite form of length encoding is used.
Lightweight Directory Access Protocol Version 3
- OCTET STRING values are encoded in the primitive form only. - OCTET STRING values are encoded in the primitive form only.
- If the value of a BOOLEAN type is true, the encoding of the value - If the value of a BOOLEAN type is true, the encoding of the value
octet is set to hex "FF". octet is set to hex "FF".
- If a value of a type is its default value, it is absent. Only some - If a value of a type is its default value, it is absent. Only some
BOOLEAN and INTEGER types have default values in this protocol BOOLEAN and INTEGER types have default values in this protocol
definition. definition.
These restrictions are meant to ease the overhead of encoding and These restrictions are meant to ease the overhead of encoding and
decoding certain elements in BER. decoding certain elements in BER.
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
stated. stated.
5.3. Transmission Control Protocol (TCP) 5.2. Transmission Control Protocol (TCP)
The encoded LDAPMessage PDUs are mapped directly onto the [TCP] The encoded LDAPMessage PDUs are mapped directly onto the [TCP]
bytestream using the BER-based encoding described in Section 5.2. It bytestream using the BER-based encoding described in Section 5.1. It
is recommended that server implementations running over the TCP is recommended that server implementations running over the TCP
provide a protocol listener on the Internet Assigned Numbers provide a protocol listener on the Internet Assigned Numbers
Authority (IANA)-assigned LDAP port, 389 [PortReg]. Servers may Authority (IANA)-assigned LDAP port, 389 [PortReg]. Servers may
instead provide a listener on a different port number. Clients MUST instead provide a listener on a different port number. Clients MUST
support contacting servers on any valid TCP port. support contacting servers on any valid TCP port.
6. Security Considerations 6. Security Considerations
This version of the protocol provides facilities for simple This version of the protocol provides facilities for simple
authentication using a cleartext password, as well as any [SASL] authentication using a cleartext password, as well as any [SASL]
mechanism. Installing SASL layers can provide integrity and other mechanism. Installing SASL and/or TLS layers can provide integrity
data security services. and other data security services.
It is also permitted that the server can return its credentials to It is also permitted that the server can return its credentials to
the client, if it chooses to do so. the client, if it chooses to do so.
Use of cleartext password is strongly discouraged where the Use of cleartext password is strongly discouraged where the
underlying transport service cannot guarantee confidentiality and may underlying transport service cannot guarantee confidentiality and may
result in disclosure of the password to unauthorized parties. result in disclosure of the password to unauthorized parties.
Lightweight Directory Access Protocol Version 3
Servers are encouraged to prevent directory modifications by clients Servers are encouraged to prevent directory modifications by clients
that have authenticated anonymously [AuthMeth]. that have authenticated anonymously [AuthMeth].
Security considerations for authentication methods, SASL mechanisms, Security considerations for authentication methods, SASL mechanisms,
and TLS are described in [AuthMeth]. and TLS are described in [AuthMeth].
It should be noted that SASL authentication exchanges do not provide It should be noted that SASL authentication exchanges do not provide
data confidentiality nor integrity protection for the version or name data confidentiality nor integrity protection for the version or name
fields of the bind request nor the resultCode, diagnosticMessage, or fields of the BindRequest nor the resultCode, diagnosticMessage, or
referral fields of the bind response nor of any information contained referral fields of the BindResponse nor of any information contained
in controls attached to bind request or responses. Thus information in controls attached to Bind requests or responses. Thus information
contained in these fields SHOULD NOT be relied on unless otherwise contained in these fields SHOULD NOT be relied on unless otherwise
Lightweight Directory Access Protocol Version 3
protected (such as by establishing protections at the transport protected (such as by establishing protections at the transport
layer). layer).
Server implementors should plan for the possibility of (protocol or Server implementors should plan for the possibility of (protocol or
external) events which alter the information used to establish external) events which alter the information used to establish
security factors (e.g., credentials, authorization identities, access security factors (e.g., credentials, authorization identities, access
controls) during the course of the LDAP exchange, and even during the controls) during the course of the LDAP session, and even during the
performance of a particular operation, and should take steps to avoid performance of a particular operation, and should take steps to avoid
insecure side effects of these changes. The ways in which these insecure side effects of these changes. The ways in which these
issues are addressed are application and/or implementation specific. issues are addressed are application and/or implementation specific.
Implementations which cache attributes and entries obtained via LDAP Implementations which cache attributes and entries obtained via LDAP
MUST ensure that access controls are maintained if that information MUST ensure that access controls are maintained if that information
is to be provided to multiple clients, since servers may have access is to be provided to multiple clients, since servers may have access
control policies which prevent the return of entries or attributes in control policies which prevent the return of entries or attributes in
search results except to particular authenticated clients. For Search results except to particular authenticated clients. For
example, caches could serve result information only to the client example, caches could serve result information only to the client
whose request caused it to be in the cache. whose request caused it to be in the cache.
Servers may return referrals or search result references which Servers may return referrals or Search result references which
redirect clients to peer servers. It is possible for a rogue redirect clients to peer servers. It is possible for a rogue
application to inject such referrals into the data stream in an application to inject such referrals into the data stream in an
attempt to redirect a client to a rogue server. Clients are advised attempt to redirect a client to a rogue server. Clients are advised
to be aware of this, and possibly reject referrals when to be aware of this, and possibly reject referrals when
confidentiality measures are not in place. Clients are advised to confidentiality measures are not in place. Clients are advised to
reject referrals from the StartTLS operation. reject referrals from the StartTLS operation.
The matchedDN and diagnosticMessage fields, as well as some The matchedDN and diagnosticMessage fields, as well as some
resultCode values (e.g., attributeOrValueExists and resultCode values (e.g., attributeOrValueExists and
entryAlreadyExists), could disclose the presence the specific data in entryAlreadyExists), could disclose the presence or absence of
the directory which is subject to access and other administrative specific data in the directory which is subject to access and other
controls. Server implementations should restrict access to protected administrative controls. Server implementations should restrict
information equally under both normal and error conditions. access to protected information equally under both normal and error
conditions.
Protocol peers MUST be prepared to handle invalid and arbitrary Protocol peers MUST be prepared to handle invalid and arbitrary
length protocol encodings. Invalid protocol encodings include: BER length protocol encodings. Invalid protocol encodings include: BER
encoding exceptions, format string and UTF-8 encoding exceptions, encoding exceptions, format string and UTF-8 encoding exceptions,
overflow exceptions, integer value exceptions, and binary mode on/off overflow exceptions, integer value exceptions, and binary mode on/off
flag exceptions. The LDAPv3 PROTOS [PROTOS-LDAP] test suite provides flag exceptions. The LDAPv3 PROTOS [PROTOS-LDAP] test suite provides
excellent examples of these exceptions and test cases used to excellent examples of these exceptions and test cases used to
discover flaws. discover flaws.
Lightweight Directory Access Protocol Version 3
7. Acknowledgements 7. Acknowledgements
This document is based on RFC 2251 by Mark Wahl, Tim Howes, and Steve This document is based on RFC 2251 by Mark Wahl, Tim Howes, and Steve
Kille. RFC 2251 was a product of the IETF ASID Working Group. Kille. RFC 2251 was a product of the IETF ASID Working Group.
It is also based on RFC 2830 by Jeff Hodges, RL "Bob" Morgan, and It is also based on RFC 2830 by Jeff Hodges, RL "Bob" Morgan, and
Mark Wahl. RFC 2830 was a product of the IETF LDAPEXT Working Group. Mark Wahl. RFC 2830 was a product of the IETF LDAPEXT Working Group.
It is also based on RFC 3771 by Roger Harrison, and Kurt Zeilenga. It is also based on RFC 3771 by Roger Harrison, and Kurt Zeilenga.
RFC 3771 was an individual submission to the IETF. RFC 3771 was an individual submission to the IETF.
Lightweight Directory Access Protocol Version 3
This document is a product of the IETF LDAPBIS Working Group. This document is a product of the IETF LDAPBIS Working Group.
Significant contributors of technical review and content include Kurt Significant contributors of technical review and content include Kurt
Zeilenga, Steven Legg, and Hallvard Furuseth. Zeilenga, Steven Legg, and Hallvard Furuseth.
8. Normative References 8. Normative References
[ABNF] Crocker, D. and P. Overell, "Augmented BNF for Syntax [ABNF] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 2234, November 1997. Specifications: ABNF", RFC 2234, November 1997.
[ASN.1] ITU-T Recommendation X.680 (07/2002) | ISO/IEC 8824-1:2002 [ASN.1] ITU-T Recommendation X.680 (07/2002) | ISO/IEC 8824-1:2002
skipping to change at line 2171 skipping to change at line 2225
[Keyword] Bradner, S., "Key words for use in RFCs to Indicate [Keyword] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997. Requirement Levels", RFC 2119, March 1997.
[LDAPDN] Zeilenga, K., "LDAP: String Representation of [LDAPDN] Zeilenga, K., "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).
[LDAPIANA] Zeilenga, K., "IANA Considerations for LDAP", draft-ietf- [LDAPIANA] Zeilenga, K., "IANA Considerations for LDAP", draft-ietf-
ldapbis-bcp64-xx.txt, (a work in progress). ldapbis-bcp64-xx.txt, (a work in progress).
Lightweight Directory Access Protocol Version 3
[LDAPURL] Smith, M., "LDAP: Uniform Resource Locator", draft-ietf- [LDAPURL] Smith, M., "LDAP: Uniform Resource Locator", draft-ietf-
ldapbis-url-xx.txt, (a work in progress). ldapbis-url-xx.txt, (a work in progress).
[Models] Zeilenga, K., "LDAP: Directory Information Models", draft- [Models] Zeilenga, K., "LDAP: Directory Information Models", draft-
ietf-ldapbis-models-xx.txt (a work in progress). ietf-ldapbis-models-xx.txt (a work in progress).
[Roadmap] Zeilenga, K., "LDAP: Technical Specification Road Map", [Roadmap] Zeilenga, K., "LDAP: Technical Specification Road Map",
draft-ietf-ldapbis-roadmap-xx.txt (a work in progress). draft-ietf-ldapbis-roadmap-xx.txt (a work in progress).
[SASL] Melnikov, A., "Simple Authentication and Security Layer", [SASL] Melnikov, A., "Simple Authentication and Security Layer",
draft-ietf-sasl-rfc2222bis-xx.txt (a work in progress). draft-ietf-sasl-rfc2222bis-xx.txt (a work in progress).
Lightweight Directory Access Protocol Version 3
[SASLPrep] Zeilenga, K., "Stringprep profile for user names and [SASLPrep] Zeilenga, K., "Stringprep profile for user names and
passwords", draft-ietf-sasl-saslprep-xx.txt, (a work in passwords", draft-ietf-sasl-saslprep-xx.txt, (a work in
progress). progress).
[StringPrep] Hoffman P. and M. Blanchet, "Preparation of [StringPrep] Hoffman P. and M. Blanchet, "Preparation of
Internationalized Strings ('stringprep')", draft-hoffman- Internationalized Strings ('stringprep')", draft-hoffman-
rfc3454bis-xx.txt, a work in progress. rfc3454bis-xx.txt, a work in progress.
[Syntaxes] Legg, S., and K. Dally, "LDAP: Syntaxes and Matching [Syntaxes] Legg, S., and K. Dally, "LDAP: Syntaxes and Matching
Rules", draft-ietf-ldapbis-syntaxes-xx.txt, (a work in Rules", draft-ietf-ldapbis-syntaxes-xx.txt, (a work in
skipping to change at line 2226 skipping to change at line 2280
10646", STD63 and RFC3629, November 2003. 10646", STD63 and RFC3629, November 2003.
[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.
[X.501] ITU-T Rec. X.501, "The Directory: Models", 1993. [X.501] ITU-T Rec. X.501, "The Directory: Models", 1993.
[X.511] ITU-T Rec. X.511, "The Directory: Abstract Service [X.511] ITU-T Rec. X.511, "The Directory: Abstract Service
Definition", 1993. Definition", 1993.
Lightweight Directory Access Protocol Version 3
9. Informative References 9. Informative References
[Glossary] The Unicode Consortium, "Unicode Glossary", [Glossary] The Unicode Consortium, "Unicode Glossary",
<http://www.unicode.org/glossary/>. <http://www.unicode.org/glossary/>.
[CharModel] Whistler, K. and M. Davis, "Unicode Technical Report [CharModel] Whistler, K. and M. Davis, "Unicode Technical Report
#17, Character Encoding Model", UTR17, #17, Character Encoding Model", UTR17,
<http://www.unicode.org/unicode/reports/tr17/>, August <http://www.unicode.org/unicode/reports/tr17/>, August
2000. 2000.
Lightweight Directory Access Protocol Version 3
[PROTOS-LDAP] University of Oulu, "PROTOS Test-Suite: c06-ldapv3" [PROTOS-LDAP] University of Oulu, "PROTOS Test-Suite: c06-ldapv3"
<http://www.ee.oulu.fi/research/ouspg/protos/testing/c06/l <http://www.ee.oulu.fi/research/ouspg/protos/testing/c06/l
dapv3/> dapv3/>
[PortReg] IANA, "Port Numbers", [PortReg] IANA, "Port Numbers",
http://www.iana.org/assignments/port-numbers http://www.iana.org/assignments/port-numbers
10. IANA Considerations 10. IANA Considerations
It is requested that the Internet Assigned Numbers Authority (IANA) It is requested that the Internet Assigned Numbers Authority (IANA)
update the LDAP result code registry to indicate that this document update the LDAP result code registry to indicate that this document
provides the definitive technical specification for result codes 0- provides the definitive technical specification for result codes 0-
36, 48-54, 64-70, 80-90. 36, 48-54, 64-70, 80-90.
It is requested that the IANA update the LDAP Protocol Mechanism It is requested that the IANA update the LDAP Protocol Mechanism
registry to indicate that this document and [AuthMeth] provides the registry to indicate that this document and [AuthMeth] provides the
definitive technical specification for the StartTLS definitive technical specification for the StartTLS
(1.3.6.1.4.1.1466.20037) extended operation. (1.3.6.1.4.1.1466.20037) Extended operation.
It is requested that the IANA update the occurrence of "RFC XXXX" in It is requested that the IANA update the occurrence of "RFC XXXX" in
Appendix B with this RFC number at publication. Appendix B with this RFC number at publication.
11. Editor's Address 11. Editor's Address
Jim Sermersheim Jim Sermersheim
Novell, Inc. Novell, Inc.
1800 South Novell Place 1800 South Novell Place
Provo, Utah 84606, USA Provo, Utah 84606, USA
skipping to change at line 2281 skipping to change at line 2335
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 4.1.9. LDAP result code enumerated in Section 4.1.9.
Additional result codes MAY be defined for use with extensions Additional result codes MAY be defined for use with extensions
[LDAPIANA]. Client implementations SHALL treat any result code which [LDAPIANA]. Client implementations SHALL treat any result code which
they do not recognize as an unknown error condition. they do not recognize as an unknown error condition.
Servers may substitute some result codes due to access controls which
prevent their disclosure.
A.1 Non-Error Result Codes A.1 Non-Error Result Codes
These result codes (called "non-error" result codes) do not indicate These result codes (called "non-error" result codes) do not indicate
an error condition: an error condition:
success (0), success (0),
compareFalse (5), compareFalse (5),
compareTrue (6), compareTrue (6),
referral (10), and referral (10), and
saslBindInProgress (14). saslBindInProgress (14).
The success, compareTrue, and compareFalse result codes indicate The success, compareTrue, and compareFalse result codes indicate
successful completion (and, hence, are referred to as "successful" successful completion (and, hence, are referred to as "successful"
result codes). result codes).
The referral and saslBindInProgress result codes indicate the client The referral and saslBindInProgress result codes indicate the client
is required to take additional action to complete the operation. needs to take additional action to complete the operation.
A.2 Result Codes A.2 Result Codes
Existing LDAP result codes are described as follows: Existing LDAP result codes are described as follows:
success (0) success (0)
Indicates the successful completion of an operation. Note: Indicates the successful completion of an operation. Note:
this code is not used with the compare operation. See this code is not used with the Compare operation. See
compareFalse (5) and compareTrue (6). compareFalse (5) and compareTrue (6).
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
StartTLS [TLS] while there are other uncompleted operations StartTLS [TLS] while there are other uncompleted operations
or if a TLS layer was already installed. or if a TLS layer was already installed.
protocolError (2) protocolError (2)
Indicates the server received data which is not well-formed. Indicates the server received data which is not well-formed.
For bind operation only, this code is also used to indicate Lightweight Directory Access Protocol Version 3
For Bind operation only, this code is also used to indicate
that the server does not support the requested protocol that the server does not support the requested protocol
version. version.
Lightweight Directory Access Protocol Version 3 For Extended operations only, this code is also used to
indicate that the server does not support (by design or
For extended operations only, this code indicates that the configuration) the Extended operation associated with the
server does not support (by design or configuration) the requestName.
extended operation associated with the requestName.
For request operations specifying multiple controls, this may For request operations specifying multiple controls, this may
be used to indicate that the server cannot ignore the order be used to indicate that the server cannot ignore the order
of the controls as specified, or that the combination of the of the controls as specified, or that the combination of the
specified controls is invalid or unspecified. specified controls is invalid or unspecified.
timeLimitExceeded (3) timeLimitExceeded (3)
Indicates that the time limit specified by the client was Indicates that the time limit specified by the client was
exceeded before the operation could be completed. exceeded before the operation could be completed.
sizeLimitExceeded (4) sizeLimitExceeded (4)
Indicates that the size limit specified by the client was Indicates that the size limit specified by the client was
exceeded before the operation could be completed. exceeded before the operation could be completed.
compareFalse (5) compareFalse (5)
Indicates that the compare operation has successfully Indicates that the Compare operation has successfully
completed and the assertion has evaluated to FALSE or completed and the assertion has evaluated to FALSE or
Undefined. Undefined.
compareTrue (6) compareTrue (6)
Indicates that the compare operation has successfully Indicates that the Compare operation has successfully
completed and the assertion has evaluated to TRUE. completed and the assertion has evaluated to TRUE.
authMethodNotSupported (7) authMethodNotSupported (7)
Indicates that the authentication method or mechanism is not Indicates that the authentication method or mechanism is not
supported. supported.
strongAuthRequired (8) strongAuthRequired (8)
Indicates that the server has detected that an established Indicates the server requires the client to authenticate
security association between the client and server has using a strong(er) mechanism.
unexpectedly failed or been compromised, or that the server
now requires the client to authenticate using a strong(er) When used with the Notice of Disconnection operation, this
mechanism. code indicates that the server has detected that an
established security association between the client and
server has unexpectedly failed or been compromised.
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 4.1.10). operation (see Section 4.1.10).
adminLimitExceeded (11) adminLimitExceeded (11)
Indicates that an administrative limit has been exceeded. Indicates that an administrative limit has been exceeded.
unavailableCriticalExtension (12) unavailableCriticalExtension (12)
Indicates a critical control is unrecognized (see Section Indicates a critical control is unrecognized (see Section
4.1.11). 4.1.11).
Lightweight Directory Access Protocol Version 3
confidentialityRequired (13) confidentialityRequired (13)
Indicates that data confidentiality protections are required. Indicates that data confidentiality protections are required.
saslBindInProgress (14) saslBindInProgress (14)
Lightweight Directory Access Protocol Version 3
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.
undefinedAttributeType (17) undefinedAttributeType (17)
Indicates that a request field contains an unrecognized Indicates that a request field contains an unrecognized
skipping to change at line 2428 skipping to change at line 2487
the code may used to indicate an alias has been dereferenced the code may used to indicate an alias has been dereferenced
which names no object. which names no object.
invalidDNSyntax (34) invalidDNSyntax (34)
Indicates that an LDAPDN or RelativeLDAPDN field (e.g. search Indicates that an 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.
Lightweight Directory Access Protocol Version 3
aliasDereferencingProblem (36) aliasDereferencingProblem (36)
Indicates that a problem occurred while dereferencing an Indicates that a problem occurred while dereferencing an
alias. Typically an alias was encountered in a situation alias. Typically an alias was encountered in a situation
where it was not allowed or where access was denied. where it was not allowed or where access was denied.
Lightweight Directory Access Protocol Version 3
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 that the provided credentials (e.g. the user's name Indicates that the provided credentials (e.g. the user's name
and password) are invalid. and password) are invalid.
insufficientAccessRights (50) insufficientAccessRights (50)
skipping to change at line 2484 skipping to change at line 2543
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.
entryAlreadyExists (68) entryAlreadyExists (68)
Indicates that the request cannot be fulfilled (added, moved, Indicates that the request cannot be fulfilled (added, moved,
or renamed) as the target entry already exists. or renamed) as the target entry already exists.
objectClassModsProhibited (69) objectClassModsProhibited (69)
Lightweight Directory Access Protocol Version 3
Indicates that an attempt to modify the object class(es) of Indicates that an attempt to modify the object class(es) of
an entry's 'objectClass' attribute is prohibited. an entry's 'objectClass' attribute is prohibited.
For example, this code is returned when a client attempts to For example, this code is returned when a client attempts to
modify the structural object class of an entry. modify the structural object class of an entry.
Lightweight Directory Access Protocol Version 3
affectsMultipleDSAs (71) affectsMultipleDSAs (71)
Indicates that the operation cannot be performed as it would Indicates that the operation cannot be performed as it would
affect multiple servers (DSAs). affect multiple servers (DSAs).
other (80) other (80)
Indicates the server has encountered an internal error. Indicates the server has encountered an internal error.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
Appendix B - Complete ASN.1 Definition Appendix B - Complete ASN.1 Definition
skipping to change at line 2678 skipping to change at line 2738
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
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),
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),
typesOnly BOOLEAN, typesOnly BOOLEAN,
filter Filter, filter Filter,
attributes AttributeSelection } attributes AttributeSelection }
AttributeSelection ::= SEQUENCE OF selector LDAPString AttributeSelection ::= SEQUENCE OF selector LDAPString
-- The LDAPString is constrained to -- The LDAPString is constrained to
-- <attributeSelection> in Section 4.5.1 -- <attributeSelection> in Section 4.5.1
Filter ::= CHOICE { Filter ::= CHOICE {
and [0] SET OF filter Filter, and [0] SET SIZE (1..MAX) OF filter Filter,
or [1] SET OF filter Filter, or [1] SET SIZE (1..MAX) OF filter 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,
... }
SubstringFilter ::= SEQUENCE { SubstringFilter ::= SEQUENCE {
type AttributeDescription, type AttributeDescription,
-- at least one must be present,
-- initial and final can occur at most once
substrings SEQUENCE SIZE (1..MAX) OF substring CHOICE { substrings SEQUENCE SIZE (1..MAX) OF substring CHOICE {
initial [0] AssertionValue, initial [0] AssertionValue, -- can occur at most once
any [1] AssertionValue, any [1] AssertionValue,
final [2] AssertionValue } } final [2] AssertionValue } -- can occur at most once
}
MatchingRuleAssertion ::= SEQUENCE { MatchingRuleAssertion ::= SEQUENCE {
matchingRule [1] MatchingRuleId OPTIONAL, matchingRule [1] MatchingRuleId OPTIONAL,
type [2] AttributeDescription OPTIONAL, type [2] AttributeDescription OPTIONAL,
matchValue [3] AssertionValue, matchValue [3] AssertionValue,
dnAttributes [4] BOOLEAN DEFAULT FALSE } dnAttributes [4] BOOLEAN DEFAULT FALSE }
SearchResultEntry ::= [APPLICATION 4] SEQUENCE { SearchResultEntry ::= [APPLICATION 4] SEQUENCE {
objectName LDAPDN, objectName LDAPDN,
attributes PartialAttributeList } attributes PartialAttributeList }
skipping to change at line 2741 skipping to change at line 2802
SIZE (1..MAX) OF uri URI SIZE (1..MAX) OF uri URI
SearchResultDone ::= [APPLICATION 5] LDAPResult SearchResultDone ::= [APPLICATION 5] LDAPResult
ModifyRequest ::= [APPLICATION 6] SEQUENCE { ModifyRequest ::= [APPLICATION 6] SEQUENCE {
object LDAPDN, object LDAPDN,
changes SEQUENCE OF change SEQUENCE { changes SEQUENCE OF change SEQUENCE {
operation ENUMERATED { operation ENUMERATED {
add (0), add (0),
delete (1), delete (1),
replace (2) }, replace (2),
... },
modification PartialAttribute } } modification PartialAttribute } }
ModifyResponse ::= [APPLICATION 7] LDAPResult ModifyResponse ::= [APPLICATION 7] LDAPResult
AddRequest ::= [APPLICATION 8] SEQUENCE { AddRequest ::= [APPLICATION 8] SEQUENCE {
entry LDAPDN, entry LDAPDN,
attributes AttributeList } attributes AttributeList }
AttributeList ::= SEQUENCE OF attribute Attribute AttributeList ::= SEQUENCE OF attribute Attribute
skipping to change at line 2779 skipping to change at line 2841
CompareResponse ::= [APPLICATION 15] LDAPResult CompareResponse ::= [APPLICATION 15] LDAPResult
AbandonRequest ::= [APPLICATION 16] MessageID AbandonRequest ::= [APPLICATION 16] MessageID
ExtendedRequest ::= [APPLICATION 23] SEQUENCE { ExtendedRequest ::= [APPLICATION 23] SEQUENCE {
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,
responseName [10] LDAPOID OPTIONAL,
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
COMPONENTS OF LDAPResult,
responseName [10] LDAPOID OPTIONAL,
responseValue [11] OCTET STRING OPTIONAL } responseValue [11] OCTET STRING OPTIONAL }
IntermediateResponse ::= [APPLICATION 25] SEQUENCE { IntermediateResponse ::= [APPLICATION 25] SEQUENCE {
responseName [0] LDAPOID OPTIONAL, responseName [0] LDAPOID OPTIONAL,
responseValue [1] OCTET STRING OPTIONAL } responseValue [1] OCTET STRING OPTIONAL }
END END
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
Appendix C - Changes Appendix C - Changes
This appendix is non-normative. This appendix is non-normative.
This appendix summarizes substantive changes made to RFC 2251 and RFC This appendix summarizes substantive changes made to RFC 2251, RFC
2830. 2830, and RFC 3771.
C.1 Changes made to RFC 2251: C.1 Changes made to RFC 2251:
This section summarizes the substantive changes made to Sections 1, This section summarizes the substantive changes made to Sections 1,
2, 3.1, and 4 through the remainder of RFC 2251. Readers should 2, 3.1, and 4 through the remainder of RFC 2251. Readers should
consult [Models] and [AuthMeth] for summaries of changes to other consult [Models] and [AuthMeth] for summaries of changes to other
sections. sections.
C.1.1 Section 1 C.1.1 Section 1 (Status of this Memo)
- Removed IESG note. Post publication of RFC 2251, mandatory LDAP - Removed IESG note. Post publication of RFC 2251, mandatory LDAP
authentication mechanisms have been standardized which are authentication mechanisms have been standardized which are
sufficient to remove this note. See [AuthMeth] for authentication sufficient to remove this note. See [AuthMeth] for authentication
mechanisms. mechanisms.
C.1.2 Section 3.1 and others C.1.2 Section 3.1 (Protocol Model) and others
- Removed notes giving history between LDAP v1, v2 and v3. Instead, - Removed notes giving history between LDAP v1, v2 and v3. Instead,
added sufficient language so that this document can stand on its added sufficient language so that this document can stand on its
own. own.
C.1.3 Section 4 C.1.3 Section 4 (Elements of Protocol)
- Clarified where the extensibility features of ASN.1 apply to the - Clarified where the extensibility features of ASN.1 apply to the
protocol. This change also affected various ASN.1 types. protocol. This change affected various ASN.1 types by the
inclusion of ellipses (...) to certain elements.
- Removed the requirement that servers which implement version 3 or - Removed the requirement that servers which implement version 3 or
later MUST provide the 'supportedLDAPVersion' attribute. This later MUST provide the 'supportedLDAPVersion' attribute. This
statement provided no interoperability advantages. statement provided no interoperability advantages.
C.1.4 Section 4.1.1 C.1.4 Section 4.1.1 (Message Envelope)
- There was a mandatory requirement for the server to return a - There was a mandatory requirement for the server to return a
Notice of Disconnection and drop the connection when a PDU is Notice of Disconnection and drop the transport connection when a
malformed in a certain way. This has been clarified such that the PDU is malformed in a certain way. This has been updated such that
server SHOULD return the Notice of Disconnection, and MUST drop the server SHOULD return the Notice of Disconnection, and MUST
the connection. drop the transport connection.
C.1.5 Section 4.1.1.1 C.1.5 Section 4.1.1.1 (Message ID)
- Clarified that the messageID of requests MUST be non-zero. - Required that the messageID of requests MUST be non-zero as the
zero is reserved for Notice of Disconnection.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
- Clarified when it is and isn't appropriate to return an already - Specified when it is and isn't appropriate to return an already
used message id. RFC 2251 accidentally imposed synchronous server used message id. RFC 2251 accidentally imposed synchronous server
behavior in its wording of this. behavior in its wording of this.
C.1.6 Section 4.1.2 C.1.6 Section 4.1.2 (String Types)
- Stated that LDAPOID is constrained to <numericoid> from [Models]. - Stated that LDAPOID is constrained to <numericoid> from [Models].
C.1.7 Section 4.1.5.1 and others C.1.7 Section 4.1.5.1 (Binary Option) and others
- Removed the Binary Option from the specification. There are - Removed the Binary Option from the specification. There are
numerous interoperability problems associated with this method of numerous interoperability problems associated with this method of
alternate attribute type encoding. Work to specify a suitable alternate attribute type encoding. Work to specify a suitable
replacement is ongoing. replacement is ongoing.
C.1.8 Section 4.1.8 C.1.8 Section 4.1.8 (Attribute)
- Combined the definitions of PartialAttribute and Attribute here, - Combined the definitions of PartialAttribute and Attribute here,
and defined Attribute in terms of PartialAttribute. and defined Attribute in terms of PartialAttribute.
C.1.9 Section 4.1.10 C.1.9 Section 4.1.10 (Result Message)
- Renamed "errorMessage" to "diagnosticMessage" as it is allowed to - Renamed "errorMessage" to "diagnosticMessage" as it is allowed to
be sent for non-error results. be sent for non-error results.
- Moved some language into Appendix A, and refer the reader there. - Moved some language into Appendix A, and refer the reader there.
- Allowed matchedDN to be present for other result codes than those - Allowed matchedDN to be present for other result codes than those
listed in RFC 2251. listed in RFC 2251.
C.1.10 Section 4.1.11 C.1.10 Section 4.1.11 (Referral)
- Defined referrals in terms of URIs rather than URLs. - Defined referrals in terms of URIs rather than URLs.
- Removed the requirement that all referral URIs MUST be equally - Removed the requirement that all referral URIs MUST be equally
capable of progressing the operation. The statement was ambiguous capable of progressing the operation. The statement was ambiguous
and provided no instructions on how to carry it out. and provided no instructions on how to carry it out.
- Added the requirement that clients MUST NOT loop between servers. - Added the requirement that clients MUST NOT loop between servers.
- Clarified the instructions for using LDAPURLs in referrals, and in - Clarified the instructions for using LDAPURLs in referrals, and in
doing so added a recommendation that the scope part be present. doing so added a recommendation that the scope part be present.
- Removed imperatives which required clients to use URLs in specific
ways to progress an operation. These did nothing for
interoperability.
C.1.11 Section 4.1.12 C.1.11 Section 4.1.12 (Controls)
- Specified how control values defined in terms of ASN.1 are to be - Specified how control values defined in terms of ASN.1 are to be
encoded. encoded.
- Noted that the criticality field is only applied to request - Noted that the criticality field is only applied to request
messages (except unbindRequest), and must be ignored when present messages (except UnbindRequest), and must be ignored when present
on response messages and unbindRequest. on response messages and UnbindRequest.
- Added language regarding combinations of controls and the ordering
of controls on a message.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
- Added language regarding combinations of controls and the ordering
of controls on a message.
- Specified that when the semantics of the combination of controls - Specified that when the semantics of the combination of controls
is undefined or unknown, it results in a protocolError. is undefined or unknown, it results in a protocolError.
- Changed "The server MUST be prepared" to "Implementations MUST be - Changed "The server MUST be prepared" to "Implementations MUST be
prepared" in the eighth paragraph to reflect that both client and prepared" in the eighth paragraph to reflect that both client and
server implementations must be able to handle this (as both parse server implementations must be able to handle this (as both parse
controls). controls).
C.1.12 Section 4.2 C.1.12 Section 4.2 (Bind Operation)
- Mandated that servers return protocolError when the version is not - Mandated that servers return protocolError when the version is not
supported. supported.
- Clarified behavior when the simple authentication is used, the - Disambiguated behavior when the simple authentication is used, the
name is empty and the password is non-empty. name is empty and the password is non-empty.
- Required servers to not dereference aliases for bind. This was - Required servers to not dereference aliases for Bind. This was
added for consistency with other operations and to help ensure added for consistency with other operations and to help ensure
data consistency. data consistency.
- Required that textual passwords be transferred as UTF-8 encoded - Required that textual passwords be transferred as UTF-8 encoded
Unicode, and added recommendations on string preparation. This was Unicode, and added recommendations on string preparation. This was
to help ensure interoperability of passwords being sent from to help ensure interoperability of passwords being sent from
different clients. different clients.
C.1.13 Section 4.2.1 C.1.13 Section 4.2.1 (Sequencing of the Bind Request)
- This section was largely reorganized for readability and language - This section was largely reorganized for readability and language
was added to clarify the authentication state of failed and was added to clarify the authentication state of failed and
abandoned bind operations. abandoned Bind operations.
- Removed: "If a SASL transfer encryption or integrity mechanism has - Removed: "If a SASL transfer encryption or integrity mechanism has
been negotiated, that mechanism does not support the changing of been negotiated, that mechanism does not support the changing of
credentials from one identity to another, then the client MUST credentials from one identity to another, then the client MUST
instead establish a new connection." instead establish a new connection."
Each SASL negotiation is, generally, independent of other SASL If there are dependencies between multiple negotiations of a
negotiations. If there were dependencies between multiple particular SASL mechanism, the technical specification for that
negotiations of a particular mechanism, the mechanism technical SASL mechanism details how applications are to deal with them.
specification should detail how applications are to deal with LDAP should not require any special handling.
them. LDAP should not require any special handling. And if an LDAP
client had used such a mechanism, it would have the option of
using another mechanism.
- Dropped MUST imperative in paragraph 3 to align with [Keywords]. - Dropped MUST imperative in paragraph 3 to align with [Keywords].
- Mandated that clients not send non-bind operations while a bind is - Mandated that clients not send non-Bind operations while a Bind is
in progress, and suggested that servers not process them if they in progress, and suggested that servers not process them if they
are received. This is needed to ensure proper sequencing of the are received. This is needed to ensure proper sequencing of the
bind in relationship to other operations. Bind in relationship to other operations.
C.1.14 Section 4.2.3 C.1.14 Section 4.2.3 (Bind Response)
- Moved most error-related text to Appendix A, and added text - Moved most error-related text to Appendix A, and added text
regarding certain errors used in conjunction with the bind regarding certain errors used in conjunction with the Bind
operation. operation.
- Prohibited the server from specifying serverSaslCreds when not - Prohibited the server from specifying serverSaslCreds when not
appropriate. appropriate.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
C.1.15 Section 4.3 C.1.15 Section 4.3 (Unbind Operation)
- Required both peers to cease transmission and close the LDAP - Specified that both peers are to cease transmission and close the
exchange for the unbind operation. transport connection for the Unbind operation.
C.1.16 Section 4.4 C.1.16 Section 4.4 (Unsolicited Notification)
- Added instructions for future specifications of Unsolicited - Added instructions for future specifications of Unsolicited
Notifications. Notifications.
C.1.17 Section 4.5.1 C.1.17 Section 4.5.1 (Search Request)
- SearchRequest attributes is now defined as an AttributeSelection - SearchRequest attributes is now defined as an AttributeSelection
type rather than AttributeDescriptionList, and an ABNF is type rather than AttributeDescriptionList, and an ABNF is
provided. provided.
- SearchRequest attributes may contain duplicate attribute - SearchRequest attributes may contain duplicate attribute
descriptions. This was previously prohibited. Now servers are descriptions. This was previously prohibited. Now servers are
instructed to ignore subsequent names when they are duplicated. instructed to ignore subsequent names when they are duplicated.
This was relaxed in order to allow different short names and also This was relaxed in order to allow different short names and also
OIDs to be requested for an attribute. OIDs to be requested for an attribute.
- The Filter choice SubstringFilter substrings type is now defined - The Filter choice SubstringFilter substrings type is now defined
with a lower bound of 1. with a lower bound of 1.
- The SubstringFilter substrings 'initial, 'any', and 'final' types - The SubstringFilter substrings 'initial, 'any', and 'final' types
are now AssertionValue rather than LDAPString. Also, added are now AssertionValue rather than LDAPString. Also, added
imperatives stating that 'initial' (if present) must be listed imperatives stating that 'initial' (if present) must be listed
first, and 'final' (if present) must be listed last. first, and 'final' (if present) must be listed last.
- Clarified the semantics of the derefAliases choices. - Disambiguated the semantics of the derefAliases choices. There was
question as to whether derefInSearching applied to the base object
in a wholeSubtree Search.
- Added instructions for equalityMatch, substrings, greaterOrEqual, - Added instructions for equalityMatch, substrings, greaterOrEqual,
lessOrEqual, and approxMatch. lessOrEqual, and approxMatch.
C.1.18 Section 4.5.2 C.1.18 Section 4.5.2 (Search Result)
- Recommended that servers not use attribute short names when it - Recommended that servers not use attribute short names when it
knows they are ambiguous or may cause interoperability problems. knows they are ambiguous or may cause interoperability problems.
- Removed all mention of ExtendedResponse due to lack of - Removed all mention of ExtendedResponse due to lack of
implementation. implementation.
C.1.19 Section 4.5.3 C.1.19 Section 4.5.3 (Continuation References in the Search Result)
- Made changes similar to those made to Section 4.1.11. - Made changes similar to those made to Section 4.1.11.
C.1.20 Section 4.5.3.1 C.1.20 Section 4.5.3.1 (Example)
- Fixed examples to adhere to changes made to Section 4.5.3. - Fixed examples to adhere to changes made to Section 4.5.3.
C.1.21 Section 4.6 C.1.21 Section 4.6 (Modify Operation)
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
- Removed restriction that required an EQUALITY matching rule in
order to perform value delete modifications. It is sufficiently
documented that in absence of an equality matching rule, octet
equality is used.
- Replaced AttributeTypeAndValues with Attribute as they are - Replaced AttributeTypeAndValues with Attribute as they are
equivalent. equivalent.
- Clarified what type of modification changes might temporarily - Spcified the types of modification changes which might temporarily
violate schema. violate schema. Some readers were under the impression that any
temporary schema violation was allowed.
C.1.22 Section 4.7 C.1.22 Section 4.7 (Add Operation)
- Aligned Add operation with X.511 in that the attributes of the RDN - Aligned Add operation with X.511 in that the attributes of the RDN
are used in conjunction with the listed attributes to create the are used in conjunction with the listed attributes to create the
entry. Previously, Add required that the distinguished values be entry. Previously, Add required that the distinguished values be
present in the listed attributes. present in the listed attributes.
- Removed requirement that the objectclass attribute MUST be
specified as some DSE types do not require this attribute.
Instead, generic wording was added, requiring the added entry to
adhere to the data model.
- Removed recommendation regarding placement of objects. This is
covered in the data model document.
C.1.23 Section 4.9 C.1.23 Section 4.9 (Modify DN Operation)
- Required servers to not dereference aliases for modify DN. This - Required servers to not dereference aliases for Modify DN. This
was added for consistency with other operations and to help ensure was added for consistency with other operations and to help ensure
data consistency. data consistency.
- Allow modify DN to fail when moving between naming contexts. - Allow Modify DN to fail when moving between naming contexts.
- Specified what happens when the attributes of the newrdn are no - Specified what happens when the attributes of the newrdn are not
present on the entry. present on the entry.
C.1.24 Section 4.10 C.1.24 Section 4.10 (Compare Operation)
- Clarified that compareFalse means that the compare took place and - Specified that compareFalse means that the Compare took place and
the result is false. There was confusion which lead people to the result is false. There was confusion which lead people to
believe that an Undefined match resulted in compareFalse. believe that an Undefined match resulted in compareFalse.
- Required servers to not dereference aliases for compare. This was - Required servers to not dereference aliases for Compare. This was
added for consistency with other operations and to help ensure added for consistency with other operations and to help ensure
data consistency. data consistency.
C.1.25 Section 4.11 C.1.25 Section 4.11 (Abandon Operation)
- Explained that since abandon returns no response, clients should - Explained that since Abandon returns no response, clients should
not use it if they need to know the outcome. not use it if they need to know the outcome.
- Specified that Abandon and Unbind cannot be abandoned. - Specified that Abandon and Unbind cannot be abandoned.
C.1.26 Section 4.12 C.1.26 Section 4.12 (Extended Operation)
- Specified how values of extended operations defined in terms of - Specified how values of Extended operations defined in terms of
ASN.1 are to be encoded. ASN.1 are to be encoded.
- Added instructions on what extended operation specifications
consist of.
- Added a recommendation that servers advertise supported extended
operations.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
C.1.27 Section 5.2 - Added instructions on what Extended operation specifications
consist of.
- Added a recommendation that servers advertise supported Extended
operations.
C.1.27 Section 5.2 (Transfer Protocols)
- Moved referral-specific instructions into referral-related - Moved referral-specific instructions into referral-related
sections. sections.
C.1.28 Section 7 C.1.28 Section 7 (Security Considerations)
- Reworded notes regarding SASL not protecting certain aspects of - Reworded notes regarding SASL not protecting certain aspects of
the LDAP bind PDU. the LDAP Bind PDUs.
- Noted that Servers are encouraged to prevent directory - Noted that Servers are encouraged to prevent directory
modifications by clients that have authenticated anonymously modifications by clients that have authenticated anonymously
[AuthMeth]. [AuthMeth].
- Added a note regarding the scenario where an identity is changed - Added a note regarding the scenario where an identity is changed
(deleted, privileges or credentials modified, etc.). (deleted, privileges or credentials modified, etc.).
- Warned against following referrals that may have been injected in - Warned against following referrals that may have been injected in
the data stream. the data stream.
- Noted that servers should protect information equally, whether in - Noted that servers should protect information equally, whether in
an error condition or not, and mentioned specifically; matchedDN, an error condition or not, and mentioned specifically; matchedDN,
diagnosticMessage, and resultCodes. diagnosticMessage, and resultCodes.
- Added a note regarding malformed and long encodings. - Added a note regarding malformed and long encodings.
C.1.29 Appendix A C.1.29 Appendix A (Complete ASN.1 Definition)
- Added "EXTENSIBILITY IMPLIED" to ASN.1 definition. - Added "EXTENSIBILITY IMPLIED" to ASN.1 definition.
- Removed AttributeType. It is not used. - Removed AttributeType. It is not used.
C.2 Changes made to RFC 2830: C.2 Changes made to RFC 2830:
This section summarizes the substantive changes made to Sections of This section summarizes the substantive changes made to Sections of
RFC 2830. Readers should consult [AuthMeth] for summaries of changes RFC 2830. Readers should consult [AuthMeth] for summaries of changes
to other sections. to other sections.
C.2.1 Section 2.3 C.2.1 Section 2.3 (Response other than "success")
- Removed wording indicating that referrals can be returned from - Removed wording indicating that referrals can be returned from
StartTLS StartTLS.
- Removed requirement that only a narrow set of result codes can be - Removed requirement that only a narrow set of result codes can be
returned. Some result codes are required in certain scenarios, but returned. Some result codes are required in certain scenarios, but
any other may be returned if appropriate. any other may be returned if appropriate.
C.2.1 Section 4.13.3.1 C.2.1 Section 4 (Closing a TLS Connection)
Lightweight Directory Access Protocol Version 3
- Reworded most of this section and added the requirement that after - Reworded most of this section and added the requirement that after
the TLS connection has been closed, the server MUST NOT send the TLS connection has been closed, the server MUST NOT send
responses to any request message received before the TLS closure. responses to any request message received before the TLS closure.
C.3 Changes made to RFC 3771: C.3 Changes made to RFC 3771:
Lightweight Directory Access Protocol Version 3 - Rewrote to fit into this document. In general, semantics were
preserved. Supporting and background language seen as redundant
- In general, all technical language was transferred in whole. due to its presence in this document was omitted.
Supporting and background language seen as redundant due to its - Specified that Intermediate responses to a request may be of
presence in this document was omitted. different types, and one of the response types may be specified to
have no response value.
Lightweight Directory Access Protocol Version 3 Lightweight Directory Access Protocol Version 3
Intellectual Property Statement Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has might or might not be available; nor does it represent that it has
 End of changes. 

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