--- 1/draft-ietf-ldapbis-protocol-13.txt 2006-02-05 00:12:00.000000000 +0100 +++ 2/draft-ietf-ldapbis-protocol-14.txt 2006-02-05 00:12:00.000000000 +0100 @@ -1,14 +1,14 @@ Internet-Draft Editor: J. Sermersheim Intended Category: Standard Track Novell, Inc -Document: draft-ietf-ldapbis-protocol-13.txt Mar 2003 +Document: draft-ietf-ldapbis-protocol-14.txt Jun 2003 Obsoletes: RFC 2251 LDAP: The Protocol Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering @@ -37,83 +37,84 @@ Protocol (LDAP). LDAP provides access to distributed directory services that act in accordance with X.500 data and service models. These protocol elements are based on those described in the X.500 Directory Access Protocol (DAP). Table of Contents 1. Introduction.....................................................2 2. Conventions......................................................3 3. Protocol Model...................................................3 - 4. Elements of Protocol.............................................3 + 4. Elements of Protocol.............................................4 4.1. Common Elements................................................4 4.1.1. Message Envelope.............................................4 4.1.2. String Types.................................................6 4.1.3. Distinguished Name and Relative Distinguished Name...........6 -Sermersheim Internet-Draft - Expires Sep 2003 Page 1 +Sermersheim Internet-Draft - Expires Jan 2004 Page 1 Lightweight Directory Access Protocol Version 3 4.1.4. Attribute Descriptions.......................................6 4.1.5. Attribute Value..............................................7 4.1.6. Attribute Value Assertion....................................7 - 4.1.7. Attribute....................................................7 + 4.1.7. Attribute....................................................8 4.1.8. Matching Rule Identifier.....................................8 4.1.9. Result Message...............................................8 4.1.10. Referral...................................................10 4.1.11. Controls...................................................11 4.2. Bind Operation................................................12 - 4.3. Unbind Operation..............................................14 + 4.3. Unbind Operation..............................................15 4.4. Unsolicited Notification......................................15 4.5. Search Operation..............................................16 4.6. Modify Operation..............................................23 - 4.7. Add Operation.................................................24 - 4.8. Delete Operation..............................................25 + 4.7. Add Operation.................................................25 + 4.8. Delete Operation..............................................26 4.9. Modify DN Operation...........................................26 4.10. Compare Operation............................................27 4.11. Abandon Operation............................................28 - 4.12. Extended Operation...........................................28 + 4.12. Extended Operation...........................................29 4.13. Start TLS Operation..........................................29 5. Protocol Element Encodings and Transfer.........................31 5.1. Protocol Encoding.............................................31 - 5.2. Transfer Protocols............................................31 + 5.2. Transfer Protocols............................................32 6. Implementation Guidelines.......................................32 6.1. Server Implementations........................................32 6.2. Client Implementations........................................32 - 7. Security Considerations.........................................32 + 7. Security Considerations.........................................33 8. Acknowledgements................................................33 9. Normative References............................................33 - 10. Editor's Address...............................................34 - Appendix A - LDAP Result Codes.....................................35 - A.1 Non-Error Result Codes.........................................35 - A.2 Error Result Codes.............................................35 - A.3 Classes and Precedence of Error Result Codes...................35 - Appendix C - Change History........................................46 - C.1 Changes made to RFC 2251:......................................46 - C.2 Changes made to draft-ietf-ldapbis-protocol-00.txt:............46 - C.3 Changes made to draft-ietf-ldapbis-protocol-01.txt:............47 - C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt:............47 - C.5 Changes made to draft-ietf-ldapbis-protocol-03.txt:............49 - C.6 Changes made to draft-ietf-ldapbis-protocol-04.txt:............51 - C.7 Changes made to draft-ietf-ldapbis-protocol-05.txt:............51 - C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt:............52 - C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt:............55 - C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt:...........55 - C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt:...........55 - C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt:...........55 - C.13 Changes made to draft-ietf-ldapbis-protocol-11.txt:...........56 - C.14 Changes made to draft-ietf-ldapbis-protocol-12.txt:...........56 - Appendix D - Outstanding Work Items................................56 + 10. Editor's Address...............................................35 + Appendix A - LDAP Result Codes.....................................36 + A.1 Non-Error Result Codes.........................................36 + A.2 Error Result Codes.............................................36 + A.3 Classes and Precedence of Error Result Codes...................36 + Appendix C - Change History........................................47 + C.1 Changes made to RFC 2251:......................................47 + C.2 Changes made to draft-ietf-ldapbis-protocol-00.txt:............47 + C.3 Changes made to draft-ietf-ldapbis-protocol-01.txt:............48 + C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt:............48 + C.5 Changes made to draft-ietf-ldapbis-protocol-03.txt:............50 + C.6 Changes made to draft-ietf-ldapbis-protocol-04.txt:............52 + C.7 Changes made to draft-ietf-ldapbis-protocol-05.txt:............52 + C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt:............53 + C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt:............56 + C.10 Changes made to draft-ietf-ldapbis-protocol-08.txt:...........56 + C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt:...........56 + C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt:...........56 + C.13 Changes made to draft-ietf-ldapbis-protocol-11.txt:...........57 + C.14 Changes made to draft-ietf-ldapbis-protocol-12.txt:...........57 + C.15 Changes made to draft-ietf-ldapbis-protocol-13.txt............57 + Appendix D - Outstanding Work Items................................58 1. Introduction -Sermersheim Internet-Draft - Expires Sep 2003 Page 2 +Sermersheim Internet-Draft - Expires Jan 2004 Page 2 Lightweight Directory Access Protocol Version 3 The Directory is "a collection of open systems cooperating to provide directory services" [X.500]. A Directory user, which may be a human or other entity, accesses the Directory through a client (or Directory User Agent (DUA)). The client, on behalf of the directory user, interacts with one or more servers (or Directory System Agents (DSA)). Clients interact with servers using a directory access protocol. @@ -127,49 +128,56 @@ This document replaces RFC 2251. Appendix C holds a detailed log of changes to RFC 2251. Prior to Working Group Last Call, this appendix will be distilled to a summary of changes to RFC 2251. 2. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", and "MAY" in this document are to be interpreted as described in [RFC2119]. + The terms "connection" and "LDAP connection" both refer to the + underlying transport protocol connection between two protocol peers. + The term "TLS connection" refers to a TLS-protected LDAP connection. + The terms "association" and "LDAP association" both refer to the + association of the LDAP connection and the current authentication and + authorization state. 3. Protocol Model The general model adopted by this protocol is one of clients performing protocol operations against servers. In this model, a client transmits a protocol request describing the operation to be performed to a server. The server is then responsible for performing the necessary operation(s) in the directory. Upon completion of the operation(s), the server returns a response containing any results or errors to the requesting client. Note that although servers are required to return responses whenever such responses are defined in the protocol, there is no requirement for synchronous behavior on the part of either clients or servers. Requests and responses for multiple operations may be exchanged between a client and server in any order, provided the client eventually receives a response for every request that requires one. Note that the core protocol operations defined in this document can be mapped to a subset of the X.500(1997) directory abstract service. + +Sermersheim Internet-Draft - Expires Jan 2004 Page 3 + Lightweight Directory Access Protocol Version 3 + However there is not a one-to-one mapping between LDAP protocol operations and DAP operations. Server implementations acting as a gateway to X.500 directories may need to make multiple DAP requests. 4. Elements of Protocol -Sermersheim Internet-Draft - Expires Sep 2003 Page 3 - Lightweight Directory Access Protocol Version 3 - The LDAP protocol is described using Abstract Syntax Notation 1 (ASN.1) [X.680], and is transferred using a subset of ASN.1 Basic Encoding Rules [X.690]. Section 5.1 specifies how the protocol is encoded and transferred. In order to support future Standards Track extensions to this protocol, extensibility is implied where it is allowed (per ASN.1). In addition, ellipses (...) have been supplied in ASN.1 types that are explicitly extensible as discussed in [LDAPIANA]. Because of the implied extensibility, clients and servers MUST ignore trailing @@ -201,31 +209,31 @@ LDAPMessage ::= SEQUENCE { messageID MessageID, protocolOp CHOICE { bindRequest BindRequest, bindResponse BindResponse, unbindRequest UnbindRequest, searchRequest SearchRequest, searchResEntry SearchResultEntry, searchResDone SearchResultDone, searchResRef SearchResultReference, + +Sermersheim Internet-Draft - Expires Jan 2004 Page 4 + Lightweight Directory Access Protocol Version 3 + modifyRequest ModifyRequest, modifyResponse ModifyResponse, addRequest AddRequest, addResponse AddResponse, delRequest DelRequest, delResponse DelResponse, modDNRequest ModifyDNRequest, - -Sermersheim Internet-Draft - Expires Sep 2003 Page 4 - Lightweight Directory Access Protocol Version 3 - modDNResponse ModifyDNResponse, compareRequest CompareRequest, compareResponse CompareResponse, abandonRequest AbandonRequest, extendedReq ExtendedRequest, extendedResp ExtendedResponse, ... }, controls [0] Controls OPTIONAL } MessageID ::= INTEGER (0 .. maxInt) @@ -251,42 +259,42 @@ with the resultCode set to protocolError. The ASN.1 type Controls is defined in section 4.1.11. 4.1.1.1. Message ID All LDAPMessage envelopes encapsulating responses contain the messageID value of the corresponding request LDAPMessage. The message ID of a request MUST have a non-zero value different from - the values of any other requests outstanding in the LDAP session of - which this message is a part. The zero value is reserved for the + the values of any other requests outstanding in the LDAP association + of which this message is a part. The zero value is reserved for the unsolicited notification message. Typical clients increment a counter for each request. - A client MUST NOT send a request with the same message ID as an - earlier request on the same connection unless it can be determined - that the server is no longer servicing the earlier request. Otherwise - the behavior is undefined. For operations that do not return - responses (unbind, abandon, and abandoned operations), the client - SHOULD assume the operation is in progress until a subsequent bind - request completes. - -Sermersheim Internet-Draft - Expires Sep 2003 Page 5 +Sermersheim Internet-Draft - Expires Jan 2004 Page 5 Lightweight Directory Access Protocol Version 3 + A client MUST NOT send a request with the same message ID as an + earlier request on the same LDAP association unless it can be + determined that the server is no longer servicing the earlier + request. Otherwise the behavior is undefined. For operations that do + not return responses (unbind, abandon, and abandoned operations), the + client SHOULD assume the operation is in progress until a subsequent + bind request completes. + 4.1.2. String Types The LDAPString is a notational convenience to indicate that, although strings of LDAPString type encode as OCTET STRING types, the - [ISO10646] character set (a superset of Unicode) is used, encoded + [ISO10646] character set (a superset of [Unicode]) is used, encoded following the UTF-8 algorithm [RFC2279]. Note that in the UTF-8 algorithm characters which are the same as ASCII (0x0000 through 0x007F) are represented as that same ASCII character in a single byte. The other byte values are used to form a variable-length encoding of an arbitrary character. LDAPString ::= OCTET STRING -- UTF-8 encoded, -- ISO 10646 characters The LDAPOID is a notational convenience to indicate that the @@ -312,41 +320,41 @@ RelativeLDAPDN ::= LDAPString -- Constrained to name-component [LDAPDN] 4.1.4. Attribute Descriptions The definition and encoding rules for attribute descriptions are defined in Section 2.5 of [Models]. Briefly, an attribute description is an attribute type and zero or more options. +Sermersheim Internet-Draft - Expires Jan 2004 Page 6 + Lightweight Directory Access Protocol Version 3 + AttributeDescription ::= LDAPString -- Constrained to attributedescription -- [Models] An AttributeDescriptionList describes a list of 0 or more attribute descriptions. (A list of zero elements has special significance in the Search request.) -Sermersheim Internet-Draft - Expires Sep 2003 Page 6 - Lightweight Directory Access Protocol Version 3 - AttributeDescriptionList ::= SEQUENCE OF AttributeDescription 4.1.5. Attribute Value A field of type AttributeValue is an OCTET STRING containing an encoded attribute value data type. The value is encoded according to its LDAP-specific encoding definition. The LDAP-specific encoding definitions for different syntaxes and attribute types may be found - in other documents, and in particular [Syntaxes]. + in other documents and in particular [Syntaxes]. AttributeValue ::= OCTET STRING Note that there is no defined limit on the size of this encoding; thus protocol values may include multi-megabyte attributes (e.g. photographs). Attributes may be defined which have arbitrary and non-printable syntax. Implementations MUST NOT display nor attempt to decode as ASN.1, a value if its syntax is not known. The implementation may @@ -366,31 +374,31 @@ attributeDesc AttributeDescription, assertionValue AssertionValue } AssertionValue ::= OCTET STRING The syntax of the AssertionValue depends on the context of the LDAP operation being performed. For example, the syntax of the EQUALITY matching rule for an attribute is used when performing a Compare operation. Often this is the same syntax used for values of the attribute type, but in some cases the assertion syntax differs from + +Sermersheim Internet-Draft - Expires Jan 2004 Page 7 + Lightweight Directory Access Protocol Version 3 + the value syntax. See objectIdentiferFirstComponentMatch in [Syntaxes] for an example. 4.1.7. Attribute An attribute consists of an attribute description and one or more values of that attribute description. (Though attributes MUST have at - -Sermersheim Internet-Draft - Expires Sep 2003 Page 7 - Lightweight Directory Access Protocol Version 3 - least one value when stored, due to access control restrictions the set may be empty when transferred from the server to the client. This is described in section 4.5.2, concerning the PartialAttributeList type.) Attribute ::= SEQUENCE { type AttributeDescription, vals SET OF AttributeValue } Each attribute value is distinct in the set (no duplicates). The set @@ -421,32 +429,32 @@ containing the components of LDAPResult to indicate the final status of a protocol operation request. LDAPResult ::= SEQUENCE { resultCode ENUMERATED { success (0), operationsError (1), protocolError (2), timeLimitExceeded (3), sizeLimitExceeded (4), + +Sermersheim Internet-Draft - Expires Jan 2004 Page 8 + Lightweight Directory Access Protocol Version 3 + compareFalse (5), compareTrue (6), authMethodNotSupported (7), strongAuthRequired (8), -- 9 reserved -- referral (10), adminLimitExceeded (11), unavailableCriticalExtension (12), - -Sermersheim Internet-Draft - Expires Sep 2003 Page 8 - Lightweight Directory Access Protocol Version 3 - confidentialityRequired (13), saslBindInProgress (14), noSuchAttribute (16), undefinedAttributeType (17), inappropriateMatching (18), constraintViolation (19), attributeOrValueExists (20), invalidAttributeSyntax (21), -- 22-31 unused -- noSuchObject (32), @@ -479,32 +487,32 @@ diagnosticMessage LDAPString, referral [3] Referral OPTIONAL } The result codes enumeration is extensible as defined in Section 3.5 of [LDAPIANA]. The meanings of the result codes are given in Appendix A. The diagnosticMessage field of this construct may, at the server's option, be used to return a string containing a textual, human- readable (terminal control and page formatting characters should be + +Sermersheim Internet-Draft - Expires Jan 2004 Page 9 + Lightweight Directory Access Protocol Version 3 + avoided) diagnostic message. As this diagnostic message is not standardized, implementations MUST NOT rely on the values returned. If the server chooses not to return a textual diagnostic, the diagnosticMessage field of the LDAPResult type MUST contain a zero length string. For certain result codes (typically, but not restricted to noSuchObject, aliasProblem, invalidDNSyntax and - -Sermersheim Internet-Draft - Expires Sep 2003 Page 9 - Lightweight Directory Access Protocol Version 3 - aliasDereferencingProblem), the matchedDN field is set to the name of the lowest entry (object or alias) in the directory that was matched. If no aliases were dereferenced while attempting to locate the entry, this will be a truncated form of the name provided, or if aliases were dereferenced, of the resulting name, as defined in section 12.5 of [X.511]. The matchedDN field contains a zero length string with all other result codes. 4.1.10. Referral @@ -536,29 +544,30 @@ operation. URLs for servers implementing the LDAP protocol are written according to [LDAPURL]. If an alias was dereferenced, the part of the URL MUST be present, with the new target object name. If the part is present, the client MUST use this name in its next request to progress the operation, and if it is not present the client will use the same name as in the original request. Some servers (e.g. participating in distributed indexing) may provide a different filter in a referral for a search operation. If the filter part of the URL + +Sermersheim Internet-Draft - Expires Jan 2004 Page 10 + Lightweight Directory Access Protocol Version 3 + is present in an LDAPURL, the client MUST use this filter in its next request to progress this search, and if it is not present the client MUST use the same filter as it used for that search. Other aspects of the new request may be the same or different as the request which generated the referral. -Sermersheim Internet-Draft - Expires Sep 2003 Page 10 - Lightweight Directory Access Protocol Version 3 - Note that UTF-8 characters appearing in a DN or search filter may not be legal for URLs (e.g. spaces) and MUST be escaped using the % method in [RFC2396]. Other kinds of URLs may be returned, so long as the operation could be performed using that protocol. 4.1.11. Controls A control is a way to specify extension information for an LDAP @@ -592,29 +601,29 @@ If the control is unrecognized or inappropriate but the criticality field is FALSE, the server MUST ignore the control. The controlValue contains any information associated with the control, and its format is defined for the control. Implementations MUST be prepared to handle arbitrary contents of the controlValue octet string, including zero bytes. It is absent only if there is no value information which is associated with a control of its type. +Sermersheim Internet-Draft - Expires Jan 2004 Page 11 + Lightweight Directory Access Protocol Version 3 + This document does not specify any controls. Controls may be specified in other documents. The specification of a control consists of: - the OBJECT IDENTIFIER assigned to the control, -Sermersheim Internet-Draft - Expires Sep 2003 Page 11 - Lightweight Directory Access Protocol Version 3 - - whether the control is always noncritical, always critical, or critical at the client's option, - the format of the controlValue contents of the control, - the semantics of the control, - and optionally, semantics regarding the combination of the control with other controls. @@ -648,87 +657,91 @@ AuthenticationChoice ::= CHOICE { simple [0] OCTET STRING, -- 1 and 2 reserved sasl [3] SaslCredentials, ... } SaslCredentials ::= SEQUENCE { mechanism LDAPString, credentials OCTET STRING OPTIONAL } +Sermersheim Internet-Draft - Expires Jan 2004 Page 12 + Lightweight Directory Access Protocol Version 3 + Parameters of the Bind Request are: - version: A version number indicating the version of the protocol - to be used in this protocol session. This document describes + to be used in this protocol association. This document describes version 3 of the LDAP protocol. Note that there is no version negotiation, and the client just sets this parameter to the - -Sermersheim Internet-Draft - Expires Sep 2003 Page 12 - Lightweight Directory Access Protocol Version 3 - version it desires. If the server does not support the specified version, it responds with protocolError in the resultCode field of the BindResponse. - name: The name of the directory object that the client wishes to bind as. This field may take on a null value (a zero length string) for the purposes of anonymous binds ([AuthMeth] section 7) or when using SASL authentication ([AuthMeth] section 4.3). Server behavior is undefined when the name is a null value, simple authentication is used, and a password is specified. The server SHOULD NOT perform any alias dereferencing in determining the object to bind as. - authentication: information used to authenticate the name, if any, provided in the Bind Request. This type is extensible as defined in Section 3.6 of [LDAPIANA]. Servers that do not support a choice supplied by a client will return authMethodNotSupported in the - result code of the BindResponse. + result code of the BindResponse. The simple form of an + AuthenticationChoice specifies a simple password to be used for + authentication. To improve matching, applications SHOULD prepare + textual strings used as passwords. Applications which prepare + textural strings used as password are REQUIRED to prepare them by + transcoding the string to [Unicode], apply [SASLprep], and encode + as UTF-8. Authorization is the use of this authentication information when performing operations. Authorization MAY be affected by factors outside of the LDAP Bind Request, such as lower layer security services. 4.2.1. Processing of the Bind Request Upon receipt of a BindRequest, the server MUST ensure there are no - outstanding operations in progress on the connection (This simplifies + outstanding operations in progress on the connection (this simplifies server implementation). The server then proceeds to authenticate the client in either a single-step, or multi-step bind process. Each step requires the server to return a BindResponse to indicate the status of authentication. If the client did not bind before sending a request and receives an operationsError, it may then send a Bind Request. If this also fails or the client chooses not to bind on the existing connection, it may close the connection, reopen it and begin again by first sending a PDU with a Bind Request. This will aid in interoperating with servers implementing other versions of LDAP. +Sermersheim Internet-Draft - Expires Jan 2004 Page 13 + Lightweight Directory Access Protocol Version 3 + Clients MAY send multiple Bind Requests on a connection to change their credentials. Authentication from earlier binds is subsequently ignored. A failed or abandoned Bind Operation has the effect of - leaving the connection in an anonymous state. To arrive at a known - authentication state after abandoning a bind operation, clients may - unbind, rebind, or make use of the BindResponse. If a SASL transfer - encryption or integrity mechanism has been negotiated, and that - mechanism does not support the changing of credentials from one + leaving the LDAP association in an anonymous state. To arrive at a + known authentication state after abandoning a bind operation, clients + may unbind, rebind, or make use of the BindResponse. If a SASL + transfer encryption or integrity mechanism has been negotiated, and + that mechanism does not support the changing of credentials from one identity to another, then the client MUST instead establish a new connection. For some SASL authentication mechanisms, it may be necessary for the client to invoke the BindRequest multiple times. This is indicated by - -Sermersheim Internet-Draft - Expires Sep 2003 Page 13 - Lightweight Directory Access Protocol Version 3 - the server sending a BindResponse with the resultCode set to saslBindInProgress. This indicates that the server requires the client to send a new bind request, with the same sasl mechanism, to continue the authentication process. If at any stage the client wishes to abort the bind process it MAY unbind and then drop the underlying connection. Clients MUST NOT invoke operations between two Bind Requests made as part of a multi-stage bind. A client may abort a SASL bind negotiation by sending a BindRequest with a different value in the mechanism field of SaslCredentials, or @@ -750,52 +763,50 @@ BindResponse consists simply of an indication from the server of the status of the client's request for authentication. A successful bind operation is indicated by a BindResponse with a resultCode set to success (0). Otherwise, an appropriate resultCode is set in the BindResponse. For bind, the protocolError (2) resultCode may be used to indicate that the version number supplied by the client is unsupported. - If the server does not support the client's requested protocol - version, it MUST set the resultCode to protocolError. - If the client receives a BindResponse response where the resultCode was protocolError, it MUST close the connection as the server will be unwilling to accept further operations. (This is for compatibility with earlier versions of LDAP, in which the bind was always the first operation, and there was no negotiation.) +Sermersheim Internet-Draft - Expires Jan 2004 Page 14 + Lightweight Directory Access Protocol Version 3 + The serverSaslCreds are used as part of a SASL-defined bind mechanism to allow the client to authenticate the server to which it is communicating, or to perform "challenge-response" authentication. 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 is not to be included in the result. 4.3. Unbind Operation -Sermersheim Internet-Draft - Expires Sep 2003 Page 14 - Lightweight Directory Access Protocol Version 3 - - The function of the Unbind Operation is to terminate a protocol - session. The Unbind Operation is defined as follows: + The function of the Unbind Operation is to terminate an LDAP + association and connection. The Unbind Operation is defined as + follows: UnbindRequest ::= [APPLICATION 2] NULL The Unbind Operation has no response defined. Upon transmission of an - UnbindRequest, a protocol client MUST assume that the protocol - session is terminated. Upon receipt of an UnbindRequest, a protocol - server MUST assume that the requesting client has terminated the - session and that all outstanding requests may be discarded, and MUST - close the connection. + UnbindRequest, a protocol client MUST assume that the LDAP + association is terminated. Upon receipt of an UnbindRequest, a + protocol server MUST assume that the requesting client has terminated + the association and that all outstanding requests may be discarded, + and MUST close the connection. 4.4. Unsolicited Notification An unsolicited notification is an LDAPMessage sent from the server to the client which is not in response to any LDAPMessage received by the server. It is used to signal an extraordinary condition in the server or in the connection between the client and the server. The notification is of an advisory nature, and the server will not expect any response to be returned from the client. @@ -810,35 +821,37 @@ 4.4.1. Notice of Disconnection 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 condition. Note that this notification is NOT a response to an unbind requested by the client: the server MUST follow the procedures of section 4.3. This notification is intended to assist clients in distinguishing between an error condition and a transient network failure. As with a connection close due to network failure, the + +Sermersheim Internet-Draft - Expires Jan 2004 Page 15 + Lightweight Directory Access Protocol Version 3 + client MUST NOT assume that any outstanding requests which modified the directory have succeeded or failed. The responseName is 1.3.6.1.4.1.1466.20036, the response field is absent, and the resultCode is used to indicate the reason for the disconnection. - The following resultCode values are to be used in this notification: + The following resultCode values have these meanings when used in this + notification: - protocolError: The server has received data from the client in which the LDAPMessage structure could not be parsed. -Sermersheim Internet-Draft - Expires Sep 2003 Page 15 - Lightweight Directory Access Protocol Version 3 - - strongAuthRequired: The server has detected that an established underlying security association protecting communication between the client and server has unexpectedly failed or been compromised. - unavailable: This server will stop accepting new connections and operations on all existing connections, and be unavailable for an extended period of time. The client may make use of an alternative server. After sending this notice, the server MUST close the connection. @@ -864,37 +877,38 @@ wholeSubtree (2) }, derefAliases ENUMERATED { neverDerefAliases (0), derefInSearching (1), derefFindingBaseObj (2), derefAlways (3) }, sizeLimit INTEGER (0 .. maxInt), timeLimit INTEGER (0 .. maxInt), typesOnly BOOLEAN, filter Filter, + +Sermersheim Internet-Draft - Expires Jan 2004 Page 16 + Lightweight Directory Access Protocol Version 3 + attributes AttributeDescriptionList } Filter ::= CHOICE { and [0] SET SIZE (1..MAX) OF Filter, or [1] SET SIZE (1..MAX) OF Filter, not [2] Filter, equalityMatch [3] AttributeValueAssertion, substrings [4] SubstringFilter, greaterOrEqual [5] AttributeValueAssertion, lessOrEqual [6] AttributeValueAssertion, present [7] AttributeDescription, approxMatch [8] AttributeValueAssertion, extensibleMatch [9] MatchingRuleAssertion } -Sermersheim Internet-Draft - Expires Sep 2003 Page 16 - Lightweight Directory Access Protocol Version 3 - SubstringFilter ::= SEQUENCE { type AttributeDescription, -- at least one must be present, -- initial and final can occur at most once substrings SEQUENCE OF CHOICE { initial [0] AssertionValue, any [1] AssertionValue, final [2] AssertionValue } } MatchingRuleAssertion ::= SEQUENCE { @@ -906,51 +920,56 @@ Parameters of the Search Request are: - baseObject: An LDAPDN that is the base object entry relative to which the search is to be performed. - scope: An indicator of the scope of the search to be performed. The semantics of the possible values of this field are identical to the semantics of the scope field in the X.511 Search Operation. - derefAliases: An indicator as to how alias objects (as defined in - X.501) are to be handled in searching. The semantics of the + [X.501]) are to be handled in searching. The semantics of the possible values of this field are: - neverDerefAliases: do not dereference aliases in searching - or in locating the base object of the search; + neverDerefAliases: Do not dereference aliases in searching + or in locating the base object of the search. - derefInSearching: dereference aliases in subordinates of - the base object in searching, but not in locating the base - object of the search; + derefInSearching: While searching, dereference any alias + object subordinate to the base object which is also in 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 detect looping in this process to prevent denial of + service attacks and duplicate entries. - derefFindingBaseObj: dereference aliases in locating the +Sermersheim Internet-Draft - Expires Jan 2004 Page 17 + Lightweight Directory Access Protocol Version 3 + + derefFindingBaseObj: Dereference aliases in locating the base object of the search, but not when searching - subordinates of the base object; + subordinates of the base object. - derefAlways: dereference aliases both in searching and in + derefAlways: Dereference aliases both in searching and in locating the base object of the search. - sizeLimit: A size limit that restricts the maximum number of entries to be returned as a result of the search. A value of 0 in this field indicates that no client-requested size limit restrictions are in effect for the search. Servers may 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 0 in this field indicates that no client-requested time limit restrictions are in effect for the search. -Sermersheim Internet-Draft - Expires Sep 2003 Page 17 - Lightweight Directory Access Protocol Version 3 - - typesOnly: An indicator as to whether search results will contain both 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. - filter: A filter that defines the conditions that must be fulfilled in order for the search to match a given entry. @@ -973,42 +992,42 @@ A filter of the "and" choice is TRUE if all the filters in the SET OF evaluate to TRUE, FALSE if at least one filter is FALSE, and 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. The present match evaluates to TRUE where there is an attribute or subtype of the specified attribute description present in an + +Sermersheim Internet-Draft - Expires Jan 2004 Page 18 + Lightweight Directory Access Protocol Version 3 + entry, and FALSE otherwise (including a presence test with an unrecognized attribute description.) The matching rule for equalityMatch filter items is defined by the EQUALITY matching rule for the attribute type. - The matching rule and assertion syntax for AssertionValues in a - substrings filter item is defined by the SUBSTR matching rule for - the attribute type. + The matching rule for AssertionValues in a substrings filter item + is defined by the SUBSTR matching rule for the attribute type. The matching rule for greaterOrEqual and lessOrEqual filter items is defined by the ORDERING matching rule for the attribute type. - The matching rule for approxMatch filter items is implementation- - defined. If approximate matching is not supported by the server, - the filter item should be treated as an equalityMatch. + The matching semantics for approxMatch filter items is + implementation-defined. If approximate matching is not supported + by the server, the filter item should be treated as an + equalityMatch. The extensibleMatch is new in this version of LDAP. If the - -Sermersheim Internet-Draft - Expires Sep 2003 Page 18 - Lightweight Directory Access Protocol Version 3 - matchingRule field is absent, the type field MUST be present, and the equality match is performed for that type. If the type field is absent and matchingRule is present, the matchValue is compared against all attributes in an entry which support that matchingRule, and 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 cannot be parsed.) If the type field is present and matchingRule is present, @@ -1031,42 +1050,42 @@ extensibleMatch is not recognized by the server, the assertion value cannot be parsed, or the type of filtering requested is not implemented, then the filter is Undefined. Thus for example if a server did not recognize the attribute type shoeSize, a filter of (shoeSize=*) would evaluate to FALSE, and the filters (shoeSize=12), (shoeSize>=12) and (shoeSize<=12) would evaluate to Undefined. Servers MUST NOT return errors if attribute descriptions or matching rule ids are not recognized, or assertion values cannot + +Sermersheim Internet-Draft - Expires Jan 2004 Page 19 + Lightweight Directory Access Protocol Version 3 + be parsed. More details of filter processing are given in section 7.8 of [X.511]. - attributes: A list of the attributes to be returned from each entry which matches the search filter. There are two special values which may be used: an empty list with no attributes, and the attribute description string "*". Both of these signify that all user attributes are to be returned. (The "*" allows the client to request all user attributes in addition to any specified operational attributes). Attributes MUST be named at most once in the list, and are returned at most once in an entry. If there are attribute descriptions in the list which are not recognized, they are ignored by the server. If the client does not want any attributes returned, it can specify a list containing only the attribute with OID "1.1". This - -Sermersheim Internet-Draft - Expires Sep 2003 Page 19 - Lightweight Directory Access Protocol Version 3 - OID was chosen arbitrarily and does not correspond to any attribute in use. Client implementors should note that even if all user attributes are requested, some attributes of the entry may not be included in search results due to access controls or other restrictions. Furthermore, servers will not return operational attributes, such as objectClasses or attributeTypes, unless they are listed by name, since there may be extremely large number of values for certain operational attributes. (A list of operational attributes @@ -1088,111 +1107,113 @@ messages containing either SearchResultEntry, SearchResultReference, or SearchResultDone data types. SearchResultEntry ::= [APPLICATION 4] SEQUENCE { objectName LDAPDN, attributes PartialAttributeList } PartialAttributeList ::= SEQUENCE OF SEQUENCE { type AttributeDescription, vals SET OF AttributeValue } + +Sermersheim Internet-Draft - Expires Jan 2004 Page 20 + Lightweight Directory Access Protocol Version 3 + -- implementors should note that the PartialAttributeList may -- have zero elements (if none of the attributes of that entry -- were requested, or could be returned), and that the vals set -- may also have zero elements (if types only was requested, or -- all values were excluded from the result.) SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL -- at least one LDAPURL element must be present SearchResultDone ::= [APPLICATION 5] LDAPResult Upon receipt of a Search Request, a server will perform the necessary search of the DIT. - If the LDAP session is operating over a connection-oriented transport - such as TCP, the server will return to the client a sequence of - responses in separate LDAP messages. There may be zero or more - responses containing SearchResultEntry, one for each entry found - -Sermersheim Internet-Draft - Expires Sep 2003 Page 20 - Lightweight Directory Access Protocol Version 3 - + If the LDAP association is operating over a connection-oriented + transport such as TCP, the server will return to the client a + sequence of responses in separate LDAP messages. There may be zero or + more responses containing SearchResultEntry, one for each entry found during the search. There may also be zero or more responses containing SearchResultReference, one for each area not explored by this server during the search. The SearchResultEntry and SearchResultReference PDUs may come in any order. Following all the SearchResultReference responses and all SearchResultEntry responses to be returned by the server, the server will return a response containing the SearchResultDone, which contains an indication of success, or detailing any errors that have occurred. Each entry returned in a SearchResultEntry will contain all appropriate attributes as specified in the attributes field of the Search Request. Return of attributes is subject to access control and other administrative policy. Some attributes may be constructed by the server and appear in a SearchResultEntry attribute list, although they are not stored attributes of an entry. Clients SHOULD NOT assume that all attributes can be modified, even if permitted by access control. If the server's schema defines a textual name for an attribute type, - it MUST use a textual name for attributes of that attribute type by + it SHOULD use a textual name for attributes of that attribute type by specifying one of the textual names as the value of the attribute type. Otherwise, the server uses the object identifier for the attribute type by specifying the object identifier, in ldapOID form, - as the value of attribute type. + as the value of attribute type. If the server determines that + returning a textual name will cause interoperability problems, it + SHOULD return the ldapOID form of the attribute type. 4.5.3. Continuation References in the Search Result If the server was able to locate the entry referred to by the baseObject but was unable to search all the entries in the scope at and under the baseObject, the server may return one or more SearchResultReference entries, each containing a reference to another set of servers for continuing the operation. A server MUST NOT return + +Sermersheim Internet-Draft - Expires Jan 2004 Page 21 + Lightweight Directory Access Protocol Version 3 + any SearchResultReference if it has not located the baseObject and thus has not searched any entries; in this case it would return a SearchResultDone containing a referral resultCode. If a server holds a copy or partial copy of the subordinate naming context, it may use the search filter to determine whether or not to return a SearchResultReference response. Otherwise SearchResultReference responses are always returned when in scope. The SearchResultReference is of the same data type as the Referral. URLs for servers implementing the LDAP protocol are written according to [LDAPURL]. The part MUST be present in the URL, with the new target object name. The client MUST use this name in its next request. Some servers (e.g. part of a distributed index exchange system) may provide a different filter in the URLs of the SearchResultReference. If the filter part of the URL is present in an LDAP URL, the client MUST use the new filter in its next request to progress the search, and if the filter part is absent the client will use again the same filter. If the originating search scope was singleLevel, the scope part of the URL will be baseObject. Other - -Sermersheim Internet-Draft - Expires Sep 2003 Page 21 - Lightweight Directory Access Protocol Version 3 - aspects of the new search request may be the same or different as the search which generated the continuation references. Other kinds of URLs may be returned so long as the operation could be performed using that protocol. The name of an unexplored subtree in a SearchResultReference need not be subordinate to the base object. In order to complete the search, the client MUST issue a new search operation for each SearchResultReference that is returned. Note that the abandon operation described in section 4.11 applies only to a - particular operation sent on a connection between a client and + particular operation sent on an association between a client and server, and if the client has multiple outstanding search operations, it MUST abandon each operation individually. 4.5.3.1. Example For example, suppose the contacted server (hosta) holds the entry "DC=Example,DC=NET" and the entry "CN=Manager,DC=Example,DC=NET". It knows that either LDAP-capable servers (hostb) or (hostc) hold "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 @@ -1200,42 +1221,43 @@ "DC=Example,DC=NET" is requested to the contacted server, it may return the following: SearchResultEntry for DC=Example,DC=NET SearchResultEntry for CN=Manager,DC=Example,DC=NET SearchResultReference { ldap://hostb/OU=People,DC=Example,DC=NET ldap://hostc/OU=People,DC=Example,DC=NET } SearchResultReference { + +Sermersheim Internet-Draft - Expires Jan 2004 Page 22 + Lightweight Directory Access Protocol Version 3 + ldap://hostd/OU=Roles,DC=Example,DC=NET } SearchResultDone (success) Client implementors should note that when following a SearchResultReference, additional SearchResultReference may be generated. Continuing the example, if the client contacted the server (hostb) and issued the search for the subtree "OU=People,DC=Example,DC=NET", the server might respond as follows: SearchResultEntry for OU=People,DC=Example,DC=NET SearchResultReference { ldap://hoste/OU=Managers,OU=People,DC=Example,DC=NET } SearchResultReference { ldap://hostf/OU=Consultants,OU=People,DC=Example,DC=NET } SearchResultDone (success) -Sermersheim Internet-Draft - Expires Sep 2003 Page 22 - Lightweight Directory Access Protocol Version 3 - If the contacted server does not hold the base object for the search, then it will return a referral to the client. For example, if the client requests a subtree search of "DC=Example,DC=ORG" to hosta, the server may return only a SearchResultDone containing a referral. SearchResultDone (referral) { ldap://hostg/DC=Example,DC=ORG??sub } 4.6. Modify Operation @@ -1257,41 +1279,41 @@ type AttributeDescription, vals SET OF AttributeValue } Parameters of the Modify Request are: - object: The object to be modified. The value of this field contains the DN of the entry to be modified. The server will not perform any alias dereferencing in determining the object to be modified. +Sermersheim Internet-Draft - Expires Jan 2004 Page 23 + Lightweight Directory Access Protocol Version 3 + - modification: A list of modifications to be performed on the entry. The entire list of entry modifications MUST be performed in the order they are listed, as a single atomic operation. While individual modifications may violate the directory schema, the resulting entry after the entire list of modifications is performed MUST conform to the requirements of the directory schema. The values that may be taken on by the 'operation' field in each modification construct have the following semantics respectively: add: add values listed to the given attribute, creating the attribute if necessary; delete: delete values listed from the given attribute, removing the entire attribute if no values are listed, or if all current values of the attribute are listed for deletion; -Sermersheim Internet-Draft - Expires Sep 2003 Page 23 - Lightweight Directory Access Protocol Version 3 - replace: replace all existing values of the given attribute with the new values listed, creating the attribute if it did not already exist. A replace with no value will delete the entire attribute if it exists, and is ignored if the attribute does not exist. The result of the modification attempted by the server upon receipt of a Modify Request is returned in a Modify Response, defined as follows: @@ -1301,110 +1323,111 @@ modifications to the DIT. The server will return to the client a single Modify Response indicating either the successful completion of the DIT modification, or the reason that the modification failed. Note that due to the requirement for atomicity in applying the list of modifications in the Modify Request, the client may expect that no modifications of the DIT have been performed if the Modify Response received indicates any sort of error, and that all requested modifications have been performed if the Modify Response indicates successful completion of - the Modify Operation. If the connection fails, whether the - modification occurred or not is indeterminate. + the Modify Operation. If the association changes or the connection + fails, whether the modification occurred or not is indeterminate. The Modify Operation cannot be used to remove from an entry any of its distinguished values, those values which form the entry's relative distinguished name. An attempt to do so will result in the server returning the error notAllowedOnRDN. The Modify DN Operation described in section 4.9 is used to rename an entry. Note that due to the simplifications made in LDAP, there is not a direct mapping of the modifications in an LDAP ModifyRequest onto the EntryModifications of a DAP ModifyEntry operation, and different + +Sermersheim Internet-Draft - Expires Jan 2004 Page 24 + Lightweight Directory Access Protocol Version 3 + implementations of LDAP-DAP gateways may use different means of representing the change. If successful, the final effect of the operations on the entry MUST be identical. 4.7. Add Operation The Add Operation allows a client to request the addition of an entry into the directory. The Add Request is defined as follows: AddRequest ::= [APPLICATION 8] SEQUENCE { entry LDAPDN, attributes AttributeList } AttributeList ::= SEQUENCE OF SEQUENCE { type AttributeDescription, vals SET OF AttributeValue } Parameters of the Add Request are: -Sermersheim Internet-Draft - Expires Sep 2003 Page 24 - Lightweight Directory Access Protocol Version 3 - - entry: the Distinguished Name of the entry to be added. Note that the server will not dereference any aliases in locating the entry to be added. - attributes: the list of attributes that make up the content of the entry being added. Clients MUST include distinguished values (those forming the entry's own RDN) in this list, the objectClass attribute, and values of any mandatory attributes of the listed object classes. Clients MUST NOT supply NO-USER-MODIFICATION attributes such as the createTimestamp or creatorsName attributes, since the server maintains these automatically. The entry named in the entry field of the AddRequest MUST NOT exist - for the AddRequest to succeed. The parent of the object and alias - entries to be added MUST exist. For example, if 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 exist, then the server would - return the error noSuchObject with the matchedDN field containing - "DC=NET". If the parent entry exists but is not in a naming context - held by the server, the server SHOULD return a referral to the server - holding the parent entry. + for the AddRequest to succeed. The immediate superior (parent) of the + object and alias entries to be added MUST exist. For example, if 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 + exist, then the server would return the error noSuchObject with the + matchedDN field containing "DC=NET". If the parent entry exists but + is not in a naming context held by the server, the server SHOULD + return a referral to the server holding the parent entry. Server implementations SHOULD NOT restrict where entries can be located in the directory unless DIT structure rules are in place. Some servers MAY 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 requested entry. The result of the add attempt will be returned to the client in the Add Response, defined as follows: AddResponse ::= [APPLICATION 9] LDAPResult +Sermersheim Internet-Draft - Expires Jan 2004 Page 25 + Lightweight Directory Access Protocol Version 3 + A response of success indicates that the new entry is present in the directory. 4.8. Delete Operation The Delete Operation allows a client to request the removal of an entry from the directory. The Delete Request is defined as follows: DelRequest ::= [APPLICATION 10] LDAPDN The Delete Request consists of the Distinguished Name of the entry to be deleted. Note that the server will not dereference aliases while resolving the name of the target entry to be removed, and that only leaf entries (those with no subordinate entries) can be deleted with this operation. The result of the delete attempted by the server upon receipt of a Delete Request is returned in the Delete Response, defined as follows: -Sermersheim Internet-Draft - Expires Sep 2003 Page 25 - Lightweight Directory Access Protocol Version 3 - DelResponse ::= [APPLICATION 11] LDAPResult Upon receipt of a Delete Request, a server will attempt to perform the entry removal requested. The result of the delete attempt will be returned to the client in the Delete Response. 4.9. Modify DN Operation The Modify DN Operation allows a client to change the leftmost (least significant) component of the name of an entry in the directory, @@ -1424,45 +1447,50 @@ server will not dereference any aliases in locating the entry to be changed. - newrdn: the RDN that will form the leftmost component of the new name of the entry. - deleteoldrdn: a boolean parameter that controls whether the old RDN attribute values are to be retained as attributes of the entry, or deleted from the entry. +Sermersheim Internet-Draft - Expires Jan 2004 Page 26 + Lightweight Directory Access Protocol Version 3 + - newSuperior: if present, this is the Distinguished Name of an - existing object entry which becomes the immediate superior of the - existing entry. + existing object entry which becomes the immediate superior + (parent)of the existing entry. The result of the name change attempted by the server upon receipt of a Modify DN Request is returned in the Modify DN Response, defined as follows: ModifyDNResponse ::= [APPLICATION 13] LDAPResult Upon receipt of a ModifyDNRequest, a server will attempt to perform the name change. The result of the name change attempt will be returned to the client in the Modify DN Response. For example, if the entry named in the "entry" parameter was "cn=John Smith,c=US", the newrdn parameter was "cn=John Cougar Smith", and the newSuperior parameter was absent, then this operation would attempt to rename the entry to be "cn=John Cougar Smith,c=US". If there was - -Sermersheim Internet-Draft - Expires Sep 2003 Page 26 - Lightweight Directory Access Protocol Version 3 - already an entry with that name, the operation would fail with error code entryAlreadyExists. + The object named in newSuperior MUST exist. For example, if 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 + exist, then the server would return the error noSuchObject with the + matchedDN field containing "DC=NET". + If the deleteoldrdn parameter is TRUE, the values forming the old RDN are deleted from the entry. If the deleteoldrdn parameter is FALSE, the values forming the old RDN will be retained as non-distinguished attribute values of the entry. The server may not perform the operation and return an error code if the setting of the deleteoldrdn parameter would cause a schema inconsistency in the entry. Note that X.500 restricts the ModifyDN operation to only affect entries that are contained within a single server. If the LDAP server is mapped onto DAP, then this restriction will apply, and the @@ -1475,20 +1503,23 @@ The Compare Operation allows a client to compare an assertion provided with an entry in the directory. The Compare Request is defined as follows: CompareRequest ::= [APPLICATION 14] SEQUENCE { entry LDAPDN, ava AttributeValueAssertion } Parameters of the Compare Request are: +Sermersheim Internet-Draft - Expires Jan 2004 Page 27 + Lightweight Directory Access Protocol Version 3 + - entry: the name of the entry to be compared with. Note that the server SHOULD NOT dereference any aliases in locating the entry to be compared with. - ava: the assertion with which an attribute in the entry is to be compared. The result of the compare attempted by the server upon receipt of a Compare Request is returned in the Compare Response, defined as follows: @@ -1498,51 +1529,52 @@ Upon receipt of a Compare Request, a server will attempt to perform the requested comparison using the EQUALITY matching rule for the attribute type. The result of the comparison will be returned to the client in the Compare Response. Note that errors and the result of comparison are all returned in the same construct. Note that some directory systems may establish access controls which permit the values of certain attributes (such as userPassword) to be compared but not interrogated by other means. -Sermersheim Internet-Draft - Expires Sep 2003 Page 27 - Lightweight Directory Access Protocol Version 3 - 4.11. Abandon Operation The function of the Abandon Operation is to allow a client to request that the server abandon an outstanding operation. The Abandon Request is defined as follows: AbandonRequest ::= [APPLICATION 16] MessageID The MessageID MUST be that of an operation which was requested - earlier in this connection. The abandon request itself has its own - message id. This is distinct from the id of the earlier operation + earlier in this LDAP association. The abandon request itself has its + own message id. This is distinct from the id of the earlier operation being abandoned. There is no response defined in the Abandon Operation. Upon transmission of an Abandon Operation, the server MAY abandon the operation identified by the Message ID in the Abandon Request. Operation responses are not sent for successfully abandoned operations. Clients can determine that an operation has been abandoned by performing a subsequent bind operation. Abandon and Unbind operations cannot be abandoned. The ability to abandon other (particularly update) operations is at the discretion of the server. In the event that a server receives an Abandon Request on a Search Operation in the midst of transmitting responses to the search, that server MUST cease transmitting entry responses to the abandoned request immediately, and MUST NOT send the SearchResponseDone. Of + +Sermersheim Internet-Draft - Expires Jan 2004 Page 28 + Lightweight Directory Access Protocol Version 3 + course, the server MUST ensure that only properly encoded LDAPMessage PDUs are transmitted. Clients MUST NOT send abandon requests for the same operation multiple times, and MUST also be prepared to receive results from operations it has abandoned (since these may have been in transit when the abandon was requested, or are not able to be abandoned). Servers MUST discard abandon requests for message IDs they do not recognize, for operations which cannot be abandoned, and for @@ -1554,24 +1586,20 @@ order to allow additional operations to be defined for services not available elsewhere in this protocol, for instance digitally signed operations and results. The extended operation allows clients to make requests and receive responses with predefined syntaxes and semantics. These may be defined in RFCs or be private to particular implementations. Each request MUST have a unique OBJECT IDENTIFIER assigned to it. ExtendedRequest ::= [APPLICATION 23] SEQUENCE { - -Sermersheim Internet-Draft - Expires Sep 2003 Page 28 - Lightweight Directory Access Protocol Version 3 - requestName [0] LDAPOID, requestValue [1] OCTET STRING OPTIONAL } The requestName is a dotted-decimal representation of the OBJECT IDENTIFIER corresponding to the request. The requestValue is information in a form defined by that request, encapsulated inside an OCTET STRING. The server will respond to this with an LDAPMessage containing the ExtendedResponse. @@ -1586,20 +1614,23 @@ protocolError result code. 4.13. Start TLS Operation The Start Transport Layer Security (StartTLS) operation provides the ability to establish Transport Layer Security [RFC2246] on an LDAP connection. 4.13.1. Start TLS Request +Sermersheim Internet-Draft - Expires Jan 2004 Page 29 + Lightweight Directory Access Protocol Version 3 + A client requests TLS establishment by transmitting a Start TLS request PDU to the server. The Start TLS request is defined in terms of an ExtendedRequest. The requestName is "1.3.6.1.4.1.1466.20037", and the requestValue field is absent. The client MUST NOT send any PDUs on this connection following this request until it receives a Start TLS extended response. 4.13.2. Start TLS Response @@ -1612,131 +1643,122 @@ the other values outlined in section 4.13.2.2. 4.13.2.1. "Success" Response If the Start TLS Response contains a resultCode of success, this indicates that the server is willing and able to negotiate TLS. Refer to section 5.3 of [AuthMeth] for details. 4.13.2.2. Response other than "success" -Sermersheim Internet-Draft - Expires Sep 2003 Page 29 - Lightweight Directory Access Protocol Version 3 - If the ExtendedResponse contains a resultCode other than success, this indicates that the server is unwilling or unable to negotiate - TLS. - - If the Start TLS extended request was not successful, the resultCode - will be one of: + TLS. The following resultCodes have these meanings for this + operation: operationsError (operations sequencing incorrect; e.g. TLS already established) protocolError (TLS not supported or incorrect PDU structure) - referral (this server doesn't do TLS, try this one) - unavailable (e.g. some major problem with TLS, or server is shutting down) The server MUST return operationsError if the client violates any of the Start TLS extended operation sequencing requirements described in section 5.3 of [AuthMeth]. If the server does not support TLS (whether by design or by current - configuration), it MUST set the resultCode to protocolError, or to - referral. The server MUST include an actual referral value in the - LDAP Result if it returns a resultCode of referral. The client's - current session is unaffected if the server does not support TLS. The - client MAY proceed with any LDAP operation, or it MAY close the - connection. + configuration), it MUST set the resultCode to protocolError. The + client's current association is unaffected if the server does not + support TLS. The client MAY proceed with any LDAP operation, or it + MAY close the connection. The server MUST return unavailable if it supports TLS but cannot establish a TLS connection for some reason, e.g. the certificate server not responding, it cannot contact its TLS implementation, or + +Sermersheim Internet-Draft - Expires Jan 2004 Page 30 + Lightweight Directory Access Protocol Version 3 + if the server is in process of shutting down. The client MAY retry the StartTLS operation, or it MAY proceed with any other LDAP - operation, or it MAY close the connection. + operation, or it MAY close the LDAP connection. 4.13.3. Closing a TLS Connection Two forms of TLS connection closure--graceful and abrupt--are supported. 4.13.3.1. Graceful Closure Either the client or server MAY terminate the TLS connection and - leave the LDAP session intact by sending a TLS closure alert. + leave the LDAP connection intact by sending a TLS closure alert. Before sending a TLS closure alert, the client MUST either wait for any outstanding LDAP operations to complete, or explicitly abandon them. After the initiator of a close has sent a TLS closure alert, it MUST discard any TLS messages until it has received a TLS closure alert - -Sermersheim Internet-Draft - Expires Sep 2003 Page 30 - Lightweight Directory Access Protocol Version 3 - from the other party. It will cease to send TLS Record Protocol PDUs, and following the receipt of the alert, MAY send and receive LDAP PDUs. The other party, if it receives a TLS closure alert, MUST immediately transmit a TLS closure alert. It will subsequently cease to send TLS Record Protocol PDUs, and MAY send and receive LDAP PDUs. 4.13.3.2. Abrupt Closure Either the client or server MAY abruptly close the TLS connection by dropping the underlying transfer protocol connection. In this circumstance, a server MAY send the client a Notice of Disconnection - before dropping the underlying connection. + before dropping the underlying LDAP connection. 5. Protocol Element Encodings and Transfer One underlying service is defined here. Clients and servers SHOULD implement the mapping of LDAP over TCP described in 5.2.1. 5.1. Protocol Encoding The protocol elements of LDAP are encoded for exchange using the Basic Encoding Rules (BER) [X.690] of ASN.1 [X.680]. However, due to the high overhead involved in using certain elements of the BER, the following additional restrictions are placed on BER-encodings of LDAP protocol elements: (1) Only the definite form of length encoding will be used. (2) OCTET STRING values will be encoded in the primitive form only. +Sermersheim Internet-Draft - Expires Jan 2004 Page 31 + Lightweight Directory Access Protocol Version 3 + (3) If the value of a BOOLEAN type is true, the encoding MUST have its contents octets set to hex "FF". (4) If a value of a type is its default value, it MUST be absent. Only some BOOLEAN and INTEGER types have default values in this protocol definition. These restrictions do not apply to ASN.1 types encapsulated inside of OCTET STRING values, such as attribute values, unless otherwise noted. 5.2. Transfer Protocols This protocol is designed to run over connection-oriented, reliable transports, with all 8 bits in an octet being significant in the data stream. -Sermersheim Internet-Draft - Expires Sep 2003 Page 31 - Lightweight Directory Access Protocol Version 3 - 5.2.1. Transmission Control Protocol (TCP) The encoded LDAPMessage PDUs are mapped directly onto the TCP bytestream using the BER-based encoding described in section 5.1. It is recommended that server implementations running over the TCP provide a protocol listener on the assigned port, 389. Servers may instead provide a listener on a different port number. Clients MUST support contacting servers on any valid TCP port. 6. Implementation Guidelines @@ -1754,43 +1776,43 @@ repeatedly contact 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 time referral handling occurs for an operation, and these kinds of clients MUST be able to handle a DIT with at least ten layers of naming contexts between the root and a leaf entry. In the absence of prior agreements with servers, clients SHOULD NOT assume that servers support any particular schemas beyond those referenced in section 6.1. Different schemas can have different attribute types with the same names. The client can retrieve the + +Sermersheim Internet-Draft - Expires Jan 2004 Page 32 + Lightweight Directory Access Protocol Version 3 + subschema entries referenced by the subschemaSubentry attribute in the entries held by the server. 7. Security Considerations When used with a connection-oriented transport, this version of the protocol provides facilities for simple authentication using a cleartext password, as well as any SASL mechanism [RFC2222]. SASL allows for integrity and privacy services to be negotiated. It is also permitted that the server can return its credentials to the client, if it chooses to do so. Use of cleartext password is strongly discouraged where the underlying transport service cannot guarantee confidentiality and may result in disclosure of the password to unauthorized parties. When used with SASL, it should be noted that the name field of the BindRequest is not protected against modification. Thus if the - -Sermersheim Internet-Draft - Expires Sep 2003 Page 32 - Lightweight Directory Access Protocol Version 3 - distinguished name of the client (an LDAPDN) is agreed through the negotiation of the credentials, it takes precedence over any value in the unprotected name field. Implementations which cache attributes and entries obtained via LDAP MUST ensure that access controls are maintained if that information is to be provided to multiple clients, since servers may have access control policies which prevent the return of entries or attributes in search results except to particular authenticated clients. For example, caches could serve result information only to the client @@ -1809,20 +1831,23 @@ This document is an update to RFC 2251, by Mark Wahl, Tim Howes, and Steve Kille. Their work along with the input of individuals of the IETF LDAPEXT, LDUP, LDAPBIS, and other Working Groups is gratefully acknowledged. 9. Normative References [X.500] ITU-T Rec. X.500, "The Directory: Overview of Concepts, Models and Service", 1993. +Sermersheim Internet-Draft - Expires Jan 2004 Page 33 + Lightweight Directory Access Protocol Version 3 + [Roadmap] K. Zeilenga (editor), "LDAP: Technical Specification Road Map", draft-ietf-ldapbis-roadmap-xx.txt (a work in progress). [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, March 1997. [X.680] ITU-T Recommendation X.680 (1997) | ISO/IEC 8824-1:1998 Information Technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation @@ -1830,23 +1855,20 @@ [X.690] ITU-T Rec. X.690, "Specification of ASN.1 encoding rules: Basic, Canonical, and Distinguished Encoding Rules", 1994. [LDAPIANA] K. Zeilenga, "IANA Considerations for LDAP", draft-ietf- ldapbis-xx.txt (a work in progress). [ISO10646] Universal Multiple-Octet Coded Character Set (UCS) - Architecture and Basic Multilingual Plane, ISO/IEC 10646-1 : 1993. -Sermersheim Internet-Draft - Expires Sep 2003 Page 33 - Lightweight Directory Access Protocol Version 3 - [RFC2279] Yergeau, F., "UTF-8, a transformation format of Unicode and ISO 10646", RFC 2279, January 1998. [Models] K. Zeilenga, "LDAP: The Models", draft-ietf-ldapbis- models-xx.txt (a work in progress). [LDAPDN] K. Zeilenga (editor), "LDAP: String Representation of Distinguished Names", draft-ietf-ldapbis-dn-xx.txt, (a work in progress). @@ -1861,30 +1883,45 @@ [RFC2396] Berners-Lee, T., Fielding, R., and L. Masinter Uniform Resource Identifiers (URI): Generic Syntax", RFC 2396, August 1998. [AuthMeth] R. Harrison (editor), "LDAP: Authentication Methods", draft-ietf-ldapbis-authmeth-xx.txt, (a work in progress). [RFC2222] Meyers, J., "Simple Authentication and Security Layer", RFC 2222, October 1997. + [SASLPrep] Zeilenga, K., "Stringprep profile for user names and + passwords", draft-ietf-sasl-saslprep-xx.txt, (a work in + progress). + +Sermersheim Internet-Draft - Expires Jan 2004 Page 34 + Lightweight Directory Access Protocol Version 3 + + [Unicode] The Unicode Consortium, "The Unicode Standard, Version + 3.2.0" is defined by "The Unicode Standard, Version 3.0" + (Reading, MA, Addison-Wesley, 2000. ISBN 0-201-61633-5), + as amended by the "Unicode Standard Annex #27: Unicode + 3.1" (http://www.unicode.org/reports/tr27/) and by the + "Unicode Standard Annex #28: Unicode 3.2" + (http://www.unicode.org/reports/tr28/). + 10. Editor's Address Jim Sermersheim Novell, Inc. 1800 South Novell Place Provo, Utah 84606, USA jimse@novell.com +1 801 861-3088 -Sermersheim Internet-Draft - Expires Sep 2003 Page 34 +Sermersheim Internet-Draft - Expires Jan 2004 Page 35 Lightweight Directory Access Protocol Version 3 Appendix A - LDAP Result Codes This normative appendix details additional considerations regarding LDAP result codes and provides a brief, general description of each LDAP result code enumerated in Section 4.1.10. Additional result codes MAY be defined for use with extensions. Client implementations SHALL treat any result code which they do not @@ -1927,21 +1964,21 @@ 6) Protocol Problem (codes 1, 2) - a problem related to protocol structure or semantics. If the server detects multiple errors simultaneously, the server SHOULD report the error with the highest precedence. Existing LDAP result codes are described as follows: success (0) -Sermersheim Internet-Draft - Expires Sep 2003 Page 35 +Sermersheim Internet-Draft - Expires Jan 2004 Page 36 Lightweight Directory Access Protocol Version 3 Indicates successful completion of an operation. This result code is normally not returned by the compare operation, see compareFalse (5) and compareTrue (6). It is possible that a future extension mechanism would allow this to be returned by a compare operation. operationsError (1) @@ -1977,21 +2014,21 @@ assertion has evaluated to FALSE. This result code is normally only returned by the compare operation. compareTrue (6) Indicates that the operation successfully completes and the assertion has evaluated to TRUE. -Sermersheim Internet-Draft - Expires Sep 2003 Page 36 +Sermersheim Internet-Draft - Expires Jan 2004 Page 37 Lightweight Directory Access Protocol Version 3 This result code is normally only returned by the compare operation. authMethodNotSupported (7) Indicates that the authentication method or mechanism is not supported. @@ -2025,21 +2062,21 @@ request, with the same SASL mechanism, to continue the authentication process (see section 4.2). noSuchAttribute (16) Indicates that the named entry does not contain the specified attribute or attribute value. undefinedAttributeType (17) -Sermersheim Internet-Draft - Expires Sep 2003 Page 37 +Sermersheim Internet-Draft - Expires Jan 2004 Page 38 Lightweight Directory Access Protocol Version 3 Indicates that a request field contains an undefined attribute type. inappropriateMatching (18) Indicates that a request cannot be completed due to an inappropriate matching. @@ -2073,21 +2110,21 @@ alias has been dereferenced which names no object. invalidDNSyntax (34) Indicates that a LDAPDN or RelativeLDAPDN field (e.g. search base, target entry, ModifyDN newrdn, etc.) of a request does not conform to the required syntax or contains attribute values which do not conform to the syntax of the attribute's type. -Sermersheim Internet-Draft - Expires Sep 2003 Page 38 +Sermersheim Internet-Draft - Expires Jan 2004 Page 39 Lightweight Directory Access Protocol Version 3 aliasDereferencingProblem (36) Indicates that a problem occurred while dereferencing an alias. Typically an alias was encountered in a situation where it was not allowed or where access was denied. inappropriateAuthentication (48) @@ -2122,21 +2159,21 @@ loopDetect (54) Indicates that the server has detected an internal loop. namingViolation (64) Indicates that the entry name violates naming restrictions. objectClassViolation (65) -Sermersheim Internet-Draft - Expires Sep 2003 Page 39 +Sermersheim Internet-Draft - Expires Jan 2004 Page 40 Lightweight Directory Access Protocol Version 3 Indicates that the entry violates object class restrictions. notAllowedOnNonLeaf (66) Indicates that operation is inappropriately acting upon a non-leaf entry. notAllowedOnRDN (67) @@ -2160,21 +2197,21 @@ affectsMultipleDSAs (71) Indicates that the operation cannot be completed as it affects multiple servers (DSAs). other (80) Indicates the server has encountered an internal error. -Sermersheim Internet-Draft - Expires Sep 2003 Page 40 +Sermersheim Internet-Draft - Expires Jan 2004 Page 41 Lightweight Directory Access Protocol Version 3 Appendix B - Complete ASN.1 Definition This appendix is normative. Lightweight-Directory-Access-Protocol-V3 DEFINITIONS IMPLICIT TAGS EXTENSIBILITY IMPLIED ::= @@ -2218,21 +2255,21 @@ LDAPDN ::= LDAPString RelativeLDAPDN ::= LDAPString AttributeDescription ::= LDAPString -- Constrained to attributedescription -- [Models] AttributeDescriptionList ::= SEQUENCE OF -Sermersheim Internet-Draft - Expires Sep 2003 Page 41 +Sermersheim Internet-Draft - Expires Jan 2004 Page 42 Lightweight Directory Access Protocol Version 3 AttributeDescription AttributeValue ::= OCTET STRING AttributeValueAssertion ::= SEQUENCE { attributeDesc AttributeDescription, assertionValue AssertionValue } @@ -2276,21 +2313,21 @@ -- 37-47 unused -- inappropriateAuthentication (48), invalidCredentials (49), insufficientAccessRights (50), busy (51), unavailable (52), unwillingToPerform (53), loopDetect (54), -- 55-63 unused -- -Sermersheim Internet-Draft - Expires Sep 2003 Page 42 +Sermersheim Internet-Draft - Expires Jan 2004 Page 43 Lightweight Directory Access Protocol Version 3 namingViolation (64), objectClassViolation (65), notAllowedOnNonLeaf (66), notAllowedOnRDN (67), entryAlreadyExists (68), objectClassModsProhibited (69), -- 70 reserved for CLDAP -- affectsMultipleDSAs (71), @@ -2334,21 +2371,21 @@ serverSaslCreds [7] OCTET STRING OPTIONAL } UnbindRequest ::= [APPLICATION 2] NULL SearchRequest ::= [APPLICATION 3] SEQUENCE { baseObject LDAPDN, scope ENUMERATED { baseObject (0), singleLevel (1), -Sermersheim Internet-Draft - Expires Sep 2003 Page 43 +Sermersheim Internet-Draft - Expires Jan 2004 Page 44 Lightweight Directory Access Protocol Version 3 wholeSubtree (2) }, derefAliases ENUMERATED { neverDerefAliases (0), derefInSearching (1), derefFindingBaseObj (2), derefAlways (3) }, sizeLimit INTEGER (0 .. maxInt), timeLimit INTEGER (0 .. maxInt), @@ -2392,21 +2429,21 @@ vals SET OF AttributeValue } SearchResultReference ::= [APPLICATION 19] SEQUENCE OF LDAPURL SearchResultDone ::= [APPLICATION 5] LDAPResult ModifyRequest ::= [APPLICATION 6] SEQUENCE { object LDAPDN, modification SEQUENCE OF SEQUENCE { -Sermersheim Internet-Draft - Expires Sep 2003 Page 44 +Sermersheim Internet-Draft - Expires Jan 2004 Page 45 Lightweight Directory Access Protocol Version 3 operation ENUMERATED { add (0), delete (1), replace (2) }, modification AttributeTypeAndValues } } AttributeTypeAndValues ::= SEQUENCE { type AttributeDescription, @@ -2448,21 +2485,21 @@ requestName [0] LDAPOID, requestValue [1] OCTET STRING OPTIONAL } ExtendedResponse ::= [APPLICATION 24] SEQUENCE { COMPONENTS OF LDAPResult, responseName [10] LDAPOID OPTIONAL, response [11] OCTET STRING OPTIONAL } END -Sermersheim Internet-Draft - Expires Sep 2003 Page 45 +Sermersheim Internet-Draft - Expires Jan 2004 Page 46 Lightweight Directory Access Protocol Version 3 Appendix C - Change History C.1 Changes made to RFC 2251: C.1.1 Editorial @@ -2505,21 +2542,21 @@ the transfer encoding is present in attributeDesc, the AssertionValue is encoded as specified by the option...". Previously, only the ;binary option was mentioned. C.2.3 Sections 4.2, 4.9, 4.10 - Added alias dereferencing specifications. In the case of modDN, followed precedent set on other update operations (... alias is not dereferenced...) In the case of bind and compare stated that -Sermersheim Internet-Draft - Expires Sep 2003 Page 46 +Sermersheim Internet-Draft - Expires Jan 2004 Page 47 Lightweight Directory Access Protocol Version 3 servers SHOULD NOT dereference aliases. Specifications were added because they were missing from the previous version and caused interoperability problems. Concessions were made for bind and compare (neither should have ever allowed alias dereferencing) by using SHOULD NOT language, due to the behavior of some existing implementations. C.2.4 Sections 4.5 and Appendix A @@ -2561,21 +2598,21 @@ by a lower layer" to "the underlying transport service cannot guarantee confidentiality" C.3.6 Section 4.5.2 - Removed all mention of ExtendedResponse due to lack of implementation. C.4 Changes made to draft-ietf-ldapbis-protocol-02.txt: -Sermersheim Internet-Draft - Expires Sep 2003 Page 47 +Sermersheim Internet-Draft - Expires Jan 2004 Page 48 Lightweight Directory Access Protocol Version 3 C.4.1 Section 4 - Removed "typically" from "and is typically transferred" in the first paragraph. We know of no (and can conceive of no) case where this isn't true. - Added "Section 5.1 specifies how the LDAP protocol is encoded." To the first paragraph. Added this cross reference for readability. - Changed "version 3 " to "version 3 or later" in the second @@ -2617,21 +2654,21 @@ controls). C.4.6 Section 4.4 - Changed "One unsolicited notification is defined" to "One unsolicited notification (Notice of Disconnection) is defined" in the third paragraph. For clarity and readability. C.4.7 Section 4.5.1 -Sermersheim Internet-Draft - Expires Sep 2003 Page 48 +Sermersheim Internet-Draft - Expires Jan 2004 Page 49 Lightweight Directory Access Protocol Version 3 - Changed "checking for the existence of the objectClass attribute" to "checking for the presence of the objectClass attribute" in the last paragraph. This was done as a measure of consistency (we use the terms present and presence rather than exists and existence in search filters). C.4.8 Section 4.5.3 @@ -2673,21 +2710,21 @@ whether there can be more than one value of an attribute of that type in an entry, the syntax to which the values must conform, the kinds of matching which can be performed on values of that attribute, and other functions." to " An attribute is a description (a type and zero or more options) with one or more associated values. The attribute type governs whether the attribute can have multiple values, the syntax and matching rules used to construct and compare values of that attribute, and other functions. Options indicate modes of transfer and other -Sermersheim Internet-Draft - Expires Sep 2003 Page 49 +Sermersheim Internet-Draft - Expires Jan 2004 Page 50 Lightweight Directory Access Protocol Version 3 functions.". This points out that an attribute consists of both the type and options. C.5.2 Section 4 - Changed "Section 5.1 specifies the encoding rules for the LDAP protocol" to "Section 5.1 specifies how the protocol is encoded and transferred." @@ -2730,21 +2767,21 @@ - Changed the wording regarding 'equally capable' referrals to "If multiple URLs are present, the client assumes that any URL may be used to progress the operation.". The previous language implied that the server MUST enforce rules that it was practically incapable of. The new language highlights the original intent-- that is, that any of the referrals may be used to progress the operation, there is no inherent 'weighting' mechanism. C.5.7 Section 4.5.1 and Appendix A -Sermersheim Internet-Draft - Expires Sep 2003 Page 50 +Sermersheim Internet-Draft - Expires Jan 2004 Page 51 Lightweight Directory Access Protocol Version 3 - Added the comment "-- initial and final can occur at most once", to clarify this restriction. C.5.8 Section 5.1 - Changed heading from "Mapping Onto BER-based Transport Services" to "Protocol Encoding". @@ -2786,21 +2823,21 @@ doc now specifies a difference between transfer and tagging options and describes the semantics of each, and how and when subtyping rules apply. Now allow options to be transmitted in any order but disallow any ordering semantics to be implied. These changes are the result of ongoing input from an engineering team designed to deal with ambiguity issues surrounding attribute options. C.7.3 Sections 4.1.5.1 and 4.1.6 -Sermersheim Internet-Draft - Expires Sep 2003 Page 51 +Sermersheim Internet-Draft - Expires Jan 2004 Page 52 Lightweight Directory Access Protocol Version 3 - Refer to non "binary" transfer encodings as "native encoding" rather than "string" encoding to clarify and avoid confusion. C.8 Changes made to draft-ietf-ldapbis-protocol-06.txt: C.8.1 Title - Changed to "LDAP: The Protocol" to be consisted with other working @@ -2842,21 +2879,21 @@ C.8.7 Relationship to X.500 - Removed section. It has been moved to [Roadmap] C.8.8 Server Specific Data Requirements - Removed section. It has been moved to [Models] C.8.9 Elements of Protocol -Sermersheim Internet-Draft - Expires Sep 2003 Page 52 +Sermersheim Internet-Draft - Expires Jan 2004 Page 53 Lightweight Directory Access Protocol Version 3 - Added "Section 5.1 specifies how the protocol is encoded and transferred." to the end of the first paragraph for reference. - Reworded notes about extensibility, and now talk about implied extensibility and the use of ellipses in the ASN.1 - Removed references to LDAPv2 in third and fourth paragraphs. @@ -2899,21 +2936,21 @@ - Clarified intent regarding exactly what is to be BER encoded. - Clarified that clients must not expect ;binary when not asking for it (;binary, as opposed to ber encoded data). C.8.17 Attribute - Use the term "attribute description" in lieu of "type" -Sermersheim Internet-Draft - Expires Sep 2003 Page 53 +Sermersheim Internet-Draft - Expires Jan 2004 Page 54 Lightweight Directory Access Protocol Version 3 - Clarified the fact that clients cannot rely on any apparent ordering of attribute values. C.8.18 LDAPResult - To resultCode, added ellipses "..." to the enumeration to indicate extensibility. and added a note, pointing to [LDAPIANA] @@ -2956,21 +2993,21 @@ - Added as normative appendix A C.8.25 ASN.1 - Added EXTENSIBILITY IMPLIED - Added a number of comments holding referenced to [Models] and [ISO10646]. -Sermersheim Internet-Draft - Expires Sep 2003 Page 54 +Sermersheim Internet-Draft - Expires Jan 2004 Page 55 Lightweight Directory Access Protocol Version 3 - Removed AttributeType. It is not used. C.9 Changes made to draft-ietf-ldapbis-protocol-07.txt: - Removed all mention of transfer encodings and the binary attribute option - Further alignment with [Models]. @@ -3009,21 +3046,21 @@ C.11 Changes made to draft-ietf-ldapbis-protocol-09.txt: - Fixed formatting C.12 Changes made to draft-ietf-ldapbis-protocol-10.txt: C.12.1 Section 4.1.4: - Removed second paragraph as this language exists in MODELS -Sermersheim Internet-Draft - Expires Sep 2003 Page 55 +Sermersheim Internet-Draft - Expires Jan 2004 Page 56 Lightweight Directory Access Protocol Version 3 C.12.2 Section 4.2.1: - Replaced fourth paragraph. It was accidentally removed in an earlier edit. C.12.2 Section 4.13: - Added section describing the StartTLS operation (moved from @@ -3054,54 +3091,91 @@ C.13.4 Section 4.5.3 - Generalized the second paragraph which cited indexing and searchreferralreferences. C.14 Changes made to draft-ietf-ldapbis-protocol-12.txt: - Reworked bind errors. - General clarifications and edits +C.15 Changes made to draft-ietf-ldapbis-protocol-13.txt + +C.15.1 Section 2 & various + - Added definitions for LDAP connection, TLS connection, and LDAP + association, and updated appropriate fields to use proper terms. + +C.15.2 Section 4.2 + - Added text to authentication, specifying the way in which textual + strings used as passwords are to be prepared. + +C.15.3 Section 4.5.1 + +Sermersheim Internet-Draft - Expires Jan 2004 Page 57 + Lightweight Directory Access Protocol Version 3 + + - Clarified derefInSearching. Specifically how it works in terms of + subtree and one level searches + +C.15.4 Section 4.5.2 + + - Changed MUST to SHOULD for returning textual attribute name, The + MUST is unreasonable. There are likely cases (such as when the + server knows multiple attributes in separate entries of a search + result set share the same short name) where returning a numericoid + is better than returning a short name. That is, the MUST may + actually disallow servers from preventing misinterpretation of + short names. This is not only an interop issue, but likely a + security consideration. + +C.15.4 Section 4.9 + - Made modify consistent with add in regards to teh need of parent + entries already existing. + +C.15.6 Section 4.13.2.2 + - Removed wording indicating that referrals can be returned from + StartTLS + Appendix D - Outstanding Work Items D.0 General - Integrate notational consistency agreements WG will discuss notation consistency. Once agreement happens, reconcile draft. - Reconcile problems with [Models]. Section 3.2 was wholly removed. There were some protocol semantics in that section that need to be brought back. Specifically, there was the notion of the server implicitly adding objectclass superclasses when a value is added. D.1 Make result code usage consistent. -Sermersheim Internet-Draft - Expires Sep 2003 Page 56 - Lightweight Directory Access Protocol Version 3 - - While there is a result code appendix, ensure it speaks of result codes in a general sense, and only highlight specific result codes in the context of an operation when that operation ties more specific meanings to that result code. D.2 Verify references. - Many referenced documents have changed. Ensure references and section numbers are correct. D.3 Usage of Naming Context - Make sure occurrences of "namingcontext" and "naming context" are consistent with [Models]. Use in section 6.2 should be reworked. It's layers of indirection that matter, not number of contexts. (That is, referrals can be returned for a number of reasons (cross reference, superior, subordinate, busy, not master, etc.) +Sermersheim Internet-Draft - Expires Jan 2004 Page 58 + Lightweight Directory Access Protocol Version 3 + Other uses are fine. D.4 Review 2119 usage D.5 Reconcile with I-D Nits D.23 Section 4.5.3 - A server MUST NOT return any SearchResultReference if it has not located the baseObject and thus has not searched any entries; in @@ -3118,23 +3192,20 @@ OR return noSuchObject. - Add "If the scope part of the LDAP URL is present, the client MUST use the new scope in its next request to progress the search. If the scope part is absent the client MUST use subtree scope to complete subtree searches and base scope to complete one level searches." to the third paragraph. D.25 Section 4.6 -Sermersheim Internet-Draft - Expires Sep 2003 Page 57 - Lightweight Directory Access Protocol Version 3 - - Resolve the meaning of "and is ignored if the attribute does not exist". See "modify: "non-existent attribute"" on the list. Not sure if there's really an issue here. Will look at archive D.27 Section 4.10 - Specify what happens when the attr is missing vs. attr isn't in schema. Also what happens if there's no equality matching rule. noSuchAttribute, undefinedAttributeType, inappropriateMatching @@ -3142,20 +3213,24 @@ - Add "control and extended operation values" to last paragraph. See "LBER (BER Restrictions)" on list. D.32 Section 6.1 - Add "that are used by those attributes" to the first paragraph. - Add "Servers which support update operations MUST, and other servers SHOULD, support strong authentication mechanisms described in [RFC2829]." as a second paragraph. Likely should just say + +Sermersheim Internet-Draft - Expires Jan 2004 Page 59 + Lightweight Directory Access Protocol Version 3 + Requirements of authentication methods, SASL mechanisms, and TLS are described in [AUTHMETH]." (also apply to next two below) - Add "Servers which provide access to sensitive information MUST, and other servers SHOULD support privacy protections such as those described in [RFC2829] and [RFC2830]." as a third paragraph. D.33 Section 7 - Add "Servers which support update operations MUST, and other servers SHOULD, support strong authentication mechanisms described @@ -3166,21 +3241,21 @@ There are concerns with "automatic" chasing regardless of which, if any, authentication method/mechanism is used. - Add notes regarding DoS attack found by CERT advisories. D.34 Appendix C - C.9. Explain why we removed ;binary, and what clients can do to get around potential problems (likely refer to an I-D) -Sermersheim Internet-Draft - Expires Sep 2003 Page 58 +Sermersheim Internet-Draft - Expires Jan 2004 Page 60 Lightweight Directory Access Protocol Version 3 Full Copyright Statement Copyright (C) The Internet Society (2002). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any @@ -3197,11 +3272,11 @@ The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. -Sermersheim Internet-Draft - Expires Sep 2003 Page 59 +Sermersheim Internet-Draft - Expires Jan 2004 Page 61