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rfc:rfc5732

Network Working Group S. Hollenbeck Request for Comments: 5732 VeriSign, Inc. STD: 69 August 2009 Obsoletes: 4932 Category: Standards Track

        Extensible Provisioning Protocol (EPP) Host Mapping

Abstract

 This document describes an Extensible Provisioning Protocol (EPP)
 mapping for the provisioning and management of Internet host names
 stored in a shared central repository.  Specified in XML, the mapping
 defines EPP command syntax and semantics as applied to host names.
 This document obsoletes RFC 4932.

Status of This Memo

 This document specifies an Internet standards track protocol for the
 Internet community, and requests discussion and suggestions for
 improvements.  Please refer to the current edition of the "Internet
 Official Protocol Standards" (STD 1) for the standardization state
 and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

 Copyright (c) 2009 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents in effect on the date of
 publication of this document (http://trustee.ietf.org/license-info).
 Please review these documents carefully, as they describe your rights
 and restrictions with respect to this document.

Hollenbeck Standards Track [Page 1] RFC 5732 EPP Host Mapping August 2009

Table of Contents

 1. Introduction ....................................................3
    1.1. Relationship of Host Objects and Domain Objects ............3
    1.2. Conventions Used in This Document ..........................4
 2. Object Attributes ...............................................4
    2.1. Host Names .................................................4
    2.2. Client Identifiers .........................................4
    2.3. Status Values ..............................................4
    2.4. Dates and Times ............................................6
    2.5. IP Addresses ...............................................6
 3. EPP Command Mapping .............................................6
    3.1. EPP Query Commands .........................................7
         3.1.1. EPP <check> Command .................................7
         3.1.2. EPP <info> Command ..................................9
         3.1.3. EPP <transfer> Query Command .......................11
    3.2. EPP Transform Commands ....................................11
         3.2.1. EPP <create> Command ...............................12
         3.2.2. EPP <delete> Command ...............................13
         3.2.3. EPP <renew> Command ................................15
         3.2.4. EPP <transfer> Command .............................15
         3.2.5. EPP <update> Command ...............................15
    3.3. Offline Review of Requested Actions .......................17
 4. Formal Syntax ..................................................19
 5. Internationalization Considerations ............................25
 6. IANA Considerations ............................................25
 7. Security Considerations ........................................26
 8. Acknowledgements ...............................................26
 9. References .....................................................26
    9.1. Normative References ......................................26
    9.2. Informative References ....................................27
 Appendix A.  Changes from RFC 4932 ................................29

Hollenbeck Standards Track [Page 2] RFC 5732 EPP Host Mapping August 2009

1. Introduction

 This document describes an Internet host name mapping for version 1.0
 of the Extensible Provisioning Protocol (EPP).  This mapping is
 specified using the Extensible Markup Language (XML) 1.0 as described
 in [W3C.REC-xml-20040204] and XML Schema notation as described in
 [W3C.REC-xmlschema-1-20041028] and [W3C.REC-xmlschema-2-20041028].
 This document obsoletes RFC 4932 [RFC4932].
 [RFC5730] provides a complete description of EPP command and response
 structures.  A thorough understanding of the base protocol
 specification is necessary to understand the mapping described in
 this document.
 XML is case sensitive.  Unless stated otherwise, XML specifications
 and examples provided in this document MUST be interpreted in the
 character case presented to develop a conforming implementation.

1.1. Relationship of Host Objects and Domain Objects

 This document assumes that host name objects have a subordinate
 relationship to a superordinate domain name object.  For example,
 host name "ns1.example.com" has a subordinate relationship to domain
 name "example.com".  EPP actions (such as object transfers) that do
 not preserve this relationship MUST be explicitly disallowed.
 A host name object can be created in a repository for which no
 superordinate domain name object exists.  For example, host name
 "ns1.example.com" can be created in the ".example" repository so that
 DNS domains in ".example" can be delegated to the host.  Such hosts
 are described as "external" hosts in this specification since the
 name of the host does not belong to the namespace of the repository
 in which the host is being used for delegation purposes.
 Whether a host is external or internal relates to the repository in
 which the host is being used for delegation purposes.  An internal
 host is subordinate if the name of the host belongs to the domain
 within the repository in which the host is being used for delegation
 purposes.  For example, host ns1.example1.com is a subordinate host
 of domain example1.com, but it is not a subordinate host of domain
 example2.com. ns1.example1.com can be used as a name server for
 example2.com.  In this case, ns1.example1.com MUST be treated as an
 internal host, subject to the rules governing operations on
 subordinate hosts within the same repository.

Hollenbeck Standards Track [Page 3] RFC 5732 EPP Host Mapping August 2009

1.2. Conventions Used in This Document

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
 document are to be interpreted as described in [RFC2119].
 In examples, "C:" represents lines sent by a protocol client and "S:"
 represents lines returned by a protocol server.  Indentation and
 white space in examples are provided only to illustrate element
 relationships and are not a REQUIRED feature of this protocol.

2. Object Attributes

 An EPP host object has attributes and associated values that can be
 viewed and modified by the sponsoring client or the server.  This
 section describes each attribute type in detail.  The formal syntax
 for the attribute values described here can be found in the "Formal
 Syntax" section of this document and in the appropriate normative
 references.

2.1. Host Names

 The syntax for host names described in this document MUST conform to
 [RFC0952] as updated by [RFC1123].  At the time of this writing, RFC
 3490 [RFC3490] describes a standard to use certain ASCII name labels
 to represent non-ASCII name labels.  These conformance requirements
 might change in the future as a result of progressing work in
 developing standards for internationalized host names.

2.2. Client Identifiers

 All EPP clients are identified by a server-unique identifier.  Client
 identifiers conform to the "clIDType" syntax described in [RFC5730].

2.3. Status Values

 A host object MUST always have at least one associated status value.
 Status values MAY be set only by the client that sponsors a host
 object and by the server on which the object resides.  A client can
 change the status of a host object using the EPP <update> command.
 Each status value MAY be accompanied by a string of human-readable
 text that describes the rationale for the status applied to the
 object.

Hollenbeck Standards Track [Page 4] RFC 5732 EPP Host Mapping August 2009

 A client MUST NOT alter status values set by the server.  A server
 MAY alter or override status values set by a client, subject to local
 server policies.  The status of an object MAY change as a result of
 either a client-initiated transform command or an action performed by
 a server operator.
 Status values that can be added or removed by a client are prefixed
 with "client".  Corresponding status values that can be added or
 removed by a server are prefixed with "server".  Status values that
 do not begin with either "client" or "server" are server-managed.
 Status Value Descriptions:
  1. clientDeleteProhibited, serverDeleteProhibited
    Requests to delete the object MUST be rejected.
  1. clientUpdateProhibited, serverUpdateProhibited
    Requests to update the object (other than to remove this status)
    MUST be rejected.
  1. linked
    The host object has at least one active association with another
    object, such as a domain object.  Servers SHOULD provide services
    to determine existing object associations.
  1. ok
    This is the normal status value for an object that has no pending
    operations or prohibitions.  This value is set and removed by the
    server as other status values are added or removed.
  1. pendingCreate, pendingDelete, pendingTransfer, pendingUpdate
    A transform command has been processed for the object (or in the
    case of a <transfer> command, for the host object's superordinate
    domain object), but the action has not been completed by the
    server.  Server operators can delay action completion for a
    variety of reasons, such as to allow for human review or third-
    party action.  A transform command that is processed, but whose
    requested action is pending, is noted with response code 1001.

Hollenbeck Standards Track [Page 5] RFC 5732 EPP Host Mapping August 2009

 When the requested action has been completed, the pendingCreate,
 pendingDelete, pendingTransfer, or pendingUpdate status value MUST be
 removed.  All clients involved in the transaction MUST be notified
 using a service message that the action has been completed and that
 the status of the object has changed.
 "ok" status MAY only be combined with "linked" status.
 "linked" status MAY be combined with any status.
 "pendingDelete" status MUST NOT be combined with either
 "clientDeleteProhibited" or "serverDeleteProhibited" status.
 "pendingUpdate" status MUST NOT be combined with either
 "clientUpdateProhibited" or "serverUpdateProhibited" status.
 The pendingCreate, pendingDelete, pendingTransfer, and pendingUpdate
 status values MUST NOT be combined with each other.
 Other status combinations not expressly prohibited MAY be used.

2.4. Dates and Times

 Date and time attribute values MUST be represented in Universal
 Coordinated Time (UTC) using the Gregorian calendar.  The extended
 date-time form using upper case "T" and "Z" characters defined in
 [W3C.REC-xmlschema-2-20041028] MUST be used to represent date-time
 values, as XML Schema does not support truncated date-time forms or
 lower case "T" and "Z" characters.

2.5. IP Addresses

 The syntax for IPv4 addresses described in this document MUST conform
 to [RFC0791].  The syntax for IPv6 addresses described in this
 document MUST conform to [RFC4291].  Practical considerations for
 publishing IPv6 address information in zone files are documented in
 [RFC2874] and [RFC3596].  A server MAY reject IP addresses that have
 not been allocated for public use by IANA.  When a host object is
 provisioned for use as a DNS name server, IP addresses SHOULD be
 required only as needed to generate DNS glue records.

3. EPP Command Mapping

 A detailed description of the EPP syntax and semantics can be found
 in [RFC5730].  The command mappings described here are specifically
 for use in provisioning and managing Internet host names via EPP.

Hollenbeck Standards Track [Page 6] RFC 5732 EPP Host Mapping August 2009

3.1. EPP Query Commands

 EPP provides two commands to retrieve host information: <check> to
 determine if a host object can be provisioned within a repository,
 and <info> to retrieve detailed information associated with a host
 object.

3.1.1. EPP <check> Command

 The EPP <check> command is used to determine if an object can be
 provisioned within a repository.  It provides a hint that allows a
 client to anticipate the success or failure of provisioning an object
 using the <create> command, as object-provisioning requirements are
 ultimately a matter of server policy.
 In addition to the standard EPP command elements, the <check> command
 MUST contain a <host:check> element that identifies the host
 namespace.  The <host:check> element contains the following child
 elements:
  1. One or more <host:name> elements that contain the fully qualified

names of the host objects to be queried.

 Example <check> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 C:  <command>
 C:    <check>
 C:      <host:check
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:name>ns2.example.com</host:name>
 C:        <host:name>ns3.example.com</host:name>
 C:      </host:check>
 C:    </check>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When a <check> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:chkData> element that
 identifies the host namespace.  The <host:chkData> element contains
 one or more <host:cd> elements that contain the following child
 elements:

Hollenbeck Standards Track [Page 7] RFC 5732 EPP Host Mapping August 2009

  1. A <host:name> element that contains the fully qualified name of

the queried host object. This element MUST contain an "avail"

    attribute whose value indicates object availability (can it be
    provisioned or not) at the moment the <check> command was
    completed.  A value of "1" or "true" means that the object can be
    provisioned.  A value of "0" or "false" means that the object
    cannot be provisioned.
  1. An OPTIONAL <host:reason> element that MAY be provided when an

object cannot be provisioned. If present, this element contains

    server-specific text to help explain why the object cannot be
    provisioned.  This text MUST be represented in the response
    language previously negotiated with the client; an OPTIONAL "lang"
    attribute MAY be present to identify the language if the
    negotiated value is something other than the default value of "en"
    (English).
 Example <check> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:chkData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 S:        <host:cd>
 S:          <host:name avail="1">ns1.example.com</host:name>
 S:        </host:cd>
 S:        <host:cd>
 S:          <host:name avail="0">ns2.example2.com</host:name>
 S:          <host:reason>In use</host:reason>
 S:        </host:cd>
 S:        <host:cd>
 S:          <host:name avail="1">ns3.example3.com</host:name>
 S:        </host:cd>
 S:      </host:chkData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>

Hollenbeck Standards Track [Page 8] RFC 5732 EPP Host Mapping August 2009

 An EPP error response MUST be returned if a <check> command cannot be
 processed for any reason.

3.1.2. EPP <info> Command

 The EPP <info> command is used to retrieve information associated
 with a host object.  In addition to the standard EPP command
 elements, the <info> command MUST contain a <host:info> element that
 identifies the host namespace.  The <host:info> element contains the
 following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object for which information is requested.

 Example <info> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 C:  <command>
 C:    <info>
 C:      <host:info
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 C:        <host:name>ns1.example.com</host:name>
 C:      </host:info>
 C:    </info>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When an <info> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:infData> element that
 identifies the host namespace.  The <host:infData> element contains
 the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object.

  1. A <host:roid> element that contains the Repository Object

IDentifier assigned to the host object when the object was

    created.
  1. One or more <host:status> elements that describe the status of the

host object.

  1. Zero or more <host:addr> elements that contain the IP addresses

associated with the host object.

Hollenbeck Standards Track [Page 9] RFC 5732 EPP Host Mapping August 2009

  1. A <host:clID> element that contains the identifier of the

sponsoring client.

  1. A <host:crID> element that contains the identifier of the client

that created the host object.

  1. A <host:crDate> element that contains the date and time of host-

object creation.

  1. A <host:upID> element that contains the identifier of the client

that last updated the host object. This element MUST NOT be

    present if the host object has never been modified.
  1. A <host:upDate> element that contains the date and time of the

most recent host-object modification. This element MUST NOT be

    present if the host object has never been modified.
  1. A <host:trDate> element that contains the date and time of the

most recent successful host-object transfer. This element MUST

    NOT be provided if the host object has never been transferred.
    Note that host objects MUST NOT be transferred directly; host
    objects MUST be transferred implicitly when the host object's
    superordinate domain object is transferred.  Host objects that are
    subject to transfer when transferring a domain object are listed
    in the response to an EPP <info> command performed on the domain
    object.
 Example <info> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:infData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:roid>NS1_EXAMPLE1-REP</host:roid>
 S:        <host:status s="linked"/>
 S:        <host:status s="clientUpdateProhibited"/>
 S:        <host:addr ip="v4">192.0.2.2</host:addr>
 S:        <host:addr ip="v4">192.0.2.29</host:addr>
 S:        <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 S:        <host:clID>ClientY</host:clID>
 S:        <host:crID>ClientX</host:crID>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>

Hollenbeck Standards Track [Page 10] RFC 5732 EPP Host Mapping August 2009

 S:        <host:upID>ClientX</host:upID>
 S:        <host:upDate>1999-12-03T09:00:00.0Z</host:upDate>
 S:        <host:trDate>2000-04-08T09:00:00.0Z</host:trDate>
 S:      </host:infData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if an <info> command cannot be
 processed for any reason.

3.1.3. EPP <transfer> Query Command

 Transfer semantics do not directly apply to host objects, so there is
 no mapping defined for the EPP <transfer> query command.

3.2. EPP Transform Commands

 EPP provides three commands to transform host objects: <create> to
 create an instance of a host object, <delete> to delete an instance
 of a host object, and <update> to change information associated with
 a host object.  This document does not define host-object mappings
 for the EPP <renew> and <transfer> commands.
 Transform commands are typically processed and completed in real
 time.  Server operators MAY receive and process transform commands
 but defer completing the requested action if human or third-party
 review is required before the requested action can be completed.  In
 such situations, the server MUST return a 1001 response code to the
 client to note that the command has been received and processed but
 that the requested action is pending.  The server MUST also manage
 the status of the object that is the subject of the command to
 reflect the initiation and completion of the requested action.  Once
 the action has been completed, all clients involved in the
 transaction MUST be notified using a service message that the action
 has been completed and that the status of the object has changed.
 Other notification methods MAY be used in addition to the required
 service message.
 Server operators SHOULD confirm that a client is authorized to
 perform a transform command on a given object.  Any attempt to
 transform an object by an unauthorized client MUST be rejected, and
 the server MUST return a 2201 response code to the client to note
 that the client lacks privileges to execute the requested command.

Hollenbeck Standards Track [Page 11] RFC 5732 EPP Host Mapping August 2009

3.2.1. EPP <create> Command

 The EPP <create> command provides a transform operation that allows a
 client to create a host object.  In addition to the standard EPP
 command elements, the <create> command MUST contain a <host:create>
 element that identifies the host namespace.  The <host:create>
 element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object to be created.

  1. Zero or more <host:addr> elements that contain the IP addresses to

be associated with the host. Each element MAY contain an "ip"

    attribute to identify the IP address format.  Attribute value "v4"
    is used to note IPv4 address format.  Attribute value "v6" is used
    to note IPv6 address format.  If the "ip" attribute is not
    specified, "v4" is the default attribute value.
 Hosts can be provisioned for use as name servers in the Domain Name
 System (DNS), described in [RFC1034] and [RFC1035].  Hosts
 provisioned as name servers might be subject to server-operator
 policies that require or prohibit specification of IP addresses,
 depending on the name of the host and the namespace in which the
 server will be used as a name server.  When provisioned for use as a
 name server, IP addresses are REQUIRED only as needed to produce DNS
 glue records.  For example, if the server is authoritative for the
 "com" namespace and the name of the server is "ns1.example.net", the
 server is not required to produce DNS glue records for the name
 server, and IP addresses for the server are not required by the DNS.
 If the host name exists in a namespace for which the server is
 authoritative, then the superordinate domain of the host MUST be
 known to the server before the host object can be created.
 Example <create> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 C:  <command>
 C:    <create>
 C:      <host:create
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:addr ip="v4">192.0.2.2</host:addr>
 C:        <host:addr ip="v4">192.0.2.29</host:addr>
 C:        <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 C:      </host:create>
 C:    </create>

Hollenbeck Standards Track [Page 12] RFC 5732 EPP Host Mapping August 2009

 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When a <create> command has been processed successfully, the EPP
 <resData> element MUST contain a child <host:creData> element that
 identifies the host namespace.  The <host:creData> element contains
 the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object.

  1. A <host:crDate> element that contains the date and time of host-

object creation.

 Example <create> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <resData>
 S:      <host:creData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>
 S:      </host:creData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if a <create> command cannot
 be processed for any reason.

3.2.2. EPP <delete> Command

 The EPP <delete> command provides a transform operation that allows a
 client to delete a host object.  In addition to the standard EPP
 command elements, the <delete> command MUST contain a <host:delete>
 element that identifies the host namespace.  The <host:delete>
 element contains the following child elements:

Hollenbeck Standards Track [Page 13] RFC 5732 EPP Host Mapping August 2009

  1. A <host:name> element that contains the fully qualified name of

the host object to be deleted.

 A host name object SHOULD NOT be deleted if the host object is
 associated with any other object.  For example, if the host object is
 associated with a domain object, the host object SHOULD NOT be
 deleted until the existing association has been broken.  Deleting a
 host object without first breaking existing associations can cause
 DNS resolution failure for domain objects that refer to the deleted
 host object.
 Example <delete> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 C:  <command>
 C:    <delete>
 C:      <host:delete
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 C:        <host:name>ns1.example.com</host:name>
 C:      </host:delete>
 C:    </delete>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When a <delete> command has been processed successfully, a server
 MUST respond with an EPP response with no <resData> element.
 Example <delete> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54321-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if a <delete> command cannot
 be processed for any reason.

Hollenbeck Standards Track [Page 14] RFC 5732 EPP Host Mapping August 2009

3.2.3. EPP <renew> Command

 Renewal semantics do not apply to host objects, so there is no
 mapping defined for the EPP <renew> command.

3.2.4. EPP <transfer> Command

 Transfer semantics do not directly apply to host objects, so there is
 no mapping defined for the EPP <transfer> command.  Host objects are
 subordinate to an existing superordinate domain object and, as such,
 they are subject to transfer when a domain object is transferred.

3.2.5. EPP <update> Command

 The EPP <update> command provides a transform operation that allows a
 client to modify the attributes of a host object.  In addition to the
 standard EPP command elements, the <update> command MUST contain a
 <host:update> element that identifies the host namespace.  The <host:
 update> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object to be updated.

  1. An OPTIONAL <host:add> element that contains attribute values to

be added to the object.

  1. An OPTIONAL <host:rem> element that contains attribute values to

be removed from the object.

  1. An OPTIONAL <host:chg> element that contains object attribute

values to be changed.

 At least one <host:add>, <host:rem>, or <host:chg> element MUST be
 provided if the command is not being extended.  All of these elements
 MAY be omitted if an <update> extension is present.  The <host:add>
 and <host:rem> elements contain the following child elements:
  1. One or more <host:addr> elements that contain IP addresses to be

associated with or removed from the host object. IP address

    restrictions described in the <create> command mapping apply here
    as well.
  1. One or more <host:status> elements that contain status values to

be associated with or removed from the object. When specifying a

    value to be removed, only the attribute value is significant;
    element text is not required to match a value for removal.

Hollenbeck Standards Track [Page 15] RFC 5732 EPP Host Mapping August 2009

 A <host:chg> element contains the following child elements:
  1. A <host:name> element that contains a new fully qualified host

name by which the host object will be known.

 Host name changes MAY require the addition or removal of IP addresses
 to be accepted by the server.  IP address association MAY be subject
 to server policies for provisioning hosts as name servers.
 Host name changes can have an impact on associated objects that refer
 to the host object.  A host name change SHOULD NOT require additional
 updates of associated objects to preserve existing associations, with
 one exception: changing an external host object that has associations
 with objects that are sponsored by a different client.  Attempts to
 update such hosts directly MUST fail with EPP error code 2305.  The
 change can be provisioned by creating a new external host with a new
 name and any needed new attributes, and subsequently updating the
 other objects sponsored by the client.
 Example <update> command:
 C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 C:  <command>
 C:    <update>
 C:      <host:update
 C:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 C:        <host:name>ns1.example.com</host:name>
 C:        <host:add>
 C:          <host:addr ip="v4">192.0.2.22</host:addr>
 C:          <host:status s="clientUpdateProhibited"/>
 C:        </host:add>
 C:        <host:rem>
 C:          <host:addr ip="v6">1080:0:0:0:8:800:200C:417A</host:addr>
 C:        </host:rem>
 C:        <host:chg>
 C:          <host:name>ns2.example.com</host:name>
 C:        </host:chg>
 C:      </host:update>
 C:    </update>
 C:    <clTRID>ABC-12345</clTRID>
 C:  </command>
 C:</epp>
 When an <update> command has been processed successfully, a server
 MUST respond with an EPP response with no <resData> element.

Hollenbeck Standards Track [Page 16] RFC 5732 EPP Host Mapping August 2009

 Example <update> response:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1000">
 S:      <msg>Command completed successfully</msg>
 S:    </result>
 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54321-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 An EPP error response MUST be returned if an <update> command could
 not be processed for any reason.

3.3. Offline Review of Requested Actions

 Commands are processed by a server in the order they are received
 from a client.  Though an immediate response confirming receipt and
 processing of the command is produced by the server, a server
 operator MAY perform an offline review of requested transform
 commands before completing the requested action.  In such situations,
 the response from the server MUST clearly note that the transform
 command has been received and processed, but the requested action is
 pending.  The status of the corresponding object MUST clearly reflect
 processing of the pending action.  The server MUST notify the client
 when offline processing of the action has been completed.
 Examples describing a <create> command that requires offline review
 are included here.  Note the result code and message returned in
 response to the <create> command.
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1001">
 S:      <msg>Command completed successfully; action pending</msg>
 S:    </result>
 S:    <resData>
 S:      <host:creData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 S:        <host:name>ns1.example.com</host:name>
 S:        <host:crDate>1999-04-03T22:00:00.0Z</host:crDate>
 S:      </host:creData>
 S:    </resData>

Hollenbeck Standards Track [Page 17] RFC 5732 EPP Host Mapping August 2009

 S:    <trID>
 S:      <clTRID>ABC-12345</clTRID>
 S:      <svTRID>54322-XYZ</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>
 The status of the host object after returning this response MUST
 include "pendingCreate".  The server operator reviews the request
 offline and informs the client of the outcome of the review either by
 queuing a service message for retrieval via the <poll> command or by
 using an out-of-band mechanism to inform the client of the request.
 The service message MUST contain text that describes the notification
 in the child <msg> element of the response <msgQ> element.  In
 addition, the EPP <resData> element MUST contain a child <host:
 panData> element that identifies the host namespace.  The <host:
 panData> element contains the following child elements:
  1. A <host:name> element that contains the fully qualified name of

the host object. The <host:name> element contains a REQUIRED

    "paResult" attribute.  A positive boolean value indicates that the
    request has been approved and completed.  A negative boolean value
    indicates that the request has been denied and the requested
    action has not been taken.
  1. A <host:paTRID> element that contains the client transaction

identifier and server transaction identifier returned with the

    original response to process the command.  The client transaction
    identifier is OPTIONAL and will only be returned if the client
    provided an identifier with the original <create> command.
  1. A <host:paDate> element that contains the date and time describing

when review of the requested action was completed.

 Example "review completed" service message:
 S:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
 S:  <response>
 S:    <result code="1301">
 S:      <msg>Command completed successfully; ack to dequeue</msg>
 S:    </result>
 S:    <msgQ count="5" id="12345">
 S:      <qDate>1999-04-04T22:01:00.0Z</qDate>
 S:      <msg>Pending action completed successfully.</msg>
 S:    </msgQ>
 S:    <resData>

Hollenbeck Standards Track [Page 18] RFC 5732 EPP Host Mapping August 2009

 S:      <host:panData
 S:       xmlns:host="urn:ietf:params:xml:ns:host-1.0">
 S:        <host:name paResult="1">ns1.example.com</host:name>
 S:        <host:paTRID>
 S:          <clTRID>ABC-12345</clTRID>
 S:          <svTRID>54322-XYZ</svTRID>
 S:        </host:paTRID>
 S:        <host:paDate>1999-04-04T22:00:00.0Z</host:paDate>
 S:      </host:panData>
 S:    </resData>
 S:    <trID>
 S:      <clTRID>BCD-23456</clTRID>
 S:      <svTRID>65432-WXY</svTRID>
 S:    </trID>
 S:  </response>
 S:</epp>

4. Formal Syntax

 An EPP object mapping is specified in XML Schema notation.  The
 formal syntax presented here is a complete schema representation of
 the object mapping suitable for automated validation of EPP XML
 instances.  The BEGIN and END tags are not part of the schema; they
 are used to note the beginning and ending of the schema for URI
 registration purposes.
 Copyright (c) 2009 IETF Trust and the persons identified as authors
 of the code.  All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 o  Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 o  Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.
 o  Neither the name of Internet Society, IETF or IETF Trust, nor the
    names of specific contributors, may be used to endorse or promote
    products derived from this software without specific prior written
    permission.

Hollenbeck Standards Track [Page 19] RFC 5732 EPP Host Mapping August 2009

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 BEGIN
 <?xml version="1.0" encoding="UTF-8"?>
 <schema targetNamespace="urn:ietf:params:xml:ns:host-1.0"
        xmlns:host="urn:ietf:params:xml:ns:host-1.0"
        xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
        xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
        xmlns="http://www.w3.org/2001/XMLSchema"
        elementFormDefault="qualified">
 <!--
 Import common element types.
 -->
  <import namespace="urn:ietf:params:xml:ns:eppcom-1.0"/>
  <import namespace="urn:ietf:params:xml:ns:epp-1.0"/>
  <annotation>
    <documentation>
      Extensible Provisioning Protocol v1.0
      host provisioning schema.
    </documentation>
  </annotation>
 <!--
 Child elements found in EPP commands.
 -->
  <element name="check" type="host:mNameType"/>
  <element name="create" type="host:createType"/>
  <element name="delete" type="host:sNameType"/>
  <element name="info" type="host:sNameType"/>
  <element name="update" type="host:updateType"/>
 <!--
 Child elements of the <create> command.
 -->
  <complexType name="createType">

Hollenbeck Standards Track [Page 20] RFC 5732 EPP Host Mapping August 2009

    <sequence>
      <element name="name" type="eppcom:labelType"/>
      <element name="addr" type="host:addrType"
       minOccurs="0" maxOccurs="unbounded"/>
    </sequence>
  </complexType>
  <complexType name="addrType">
    <simpleContent>
      <extension base="host:addrStringType">
        <attribute name="ip" type="host:ipType"
         default="v4"/>
      </extension>
    </simpleContent>
  </complexType>
  <simpleType name="addrStringType">
    <restriction base="token">
      <minLength value="3"/>
      <maxLength value="45"/>
    </restriction>
  </simpleType>
  <simpleType name="ipType">
    <restriction base="token">
      <enumeration value="v4"/>
      <enumeration value="v6"/>
    </restriction>
  </simpleType>
 <!--
 Child elements of the <delete> and <info> commands.
 -->
  <complexType name="sNameType">
    <sequence>
      <element name="name" type="eppcom:labelType"/>
    </sequence>
  </complexType>
 <!--
 Child element of commands that accept multiple names.
 -->
  <complexType name="mNameType">
    <sequence>
      <element name="name" type="eppcom:labelType"
       maxOccurs="unbounded"/>
    </sequence>
  </complexType>

Hollenbeck Standards Track [Page 21] RFC 5732 EPP Host Mapping August 2009

 <!--
 Child elements of the <update> command.
 -->
  <complexType name="updateType">
    <sequence>
      <element name="name" type="eppcom:labelType"/>
      <element name="add" type="host:addRemType"
       minOccurs="0"/>
      <element name="rem" type="host:addRemType"
       minOccurs="0"/>
      <element name="chg" type="host:chgType"
       minOccurs="0"/>
    </sequence>
  </complexType>
 <!--
 Data elements that can be added or removed.
 -->
  <complexType name="addRemType">
    <sequence>
      <element name="addr" type="host:addrType"
       minOccurs="0" maxOccurs="unbounded"/>
      <element name="status" type="host:statusType"
       minOccurs="0" maxOccurs="7"/>
    </sequence>
  </complexType>
 <!--
 Data elements that can be changed.
 -->
  <complexType name="chgType">
    <sequence>
      <element name="name" type="eppcom:labelType"/>
    </sequence>
  </complexType>
 <!--
 Child response elements.
 -->
  <element name="chkData" type="host:chkDataType"/>
  <element name="creData" type="host:creDataType"/>
  <element name="infData" type="host:infDataType"/>
  <element name="panData" type="host:panDataType"/>
 <!--
 <check> response elements.
 -->
  <complexType name="chkDataType">

Hollenbeck Standards Track [Page 22] RFC 5732 EPP Host Mapping August 2009

    <sequence>
      <element name="cd" type="host:checkType"
       maxOccurs="unbounded"/>
    </sequence>
  </complexType>
  <complexType name="checkType">
    <sequence>
      <element name="name" type="host:checkNameType"/>
      <element name="reason" type="eppcom:reasonType"
       minOccurs="0"/>
    </sequence>
  </complexType>
  <complexType name="checkNameType">
    <simpleContent>
      <extension base="eppcom:labelType">
        <attribute name="avail" type="boolean"
         use="required"/>
      </extension>
    </simpleContent>
  </complexType>
 <!--
 <create> response elements.
 -->
  <complexType name="creDataType">
    <sequence>
      <element name="name" type="eppcom:labelType"/>
      <element name="crDate" type="dateTime"/>
    </sequence>
  </complexType>
 <!--
 <info> response elements.
 -->
  <complexType name="infDataType">
    <sequence>
      <element name="name" type="eppcom:labelType"/>
      <element name="roid" type="eppcom:roidType"/>
      <element name="status" type="host:statusType"
       maxOccurs="7"/>
      <element name="addr" type="host:addrType"
       minOccurs="0" maxOccurs="unbounded"/>
      <element name="clID" type="eppcom:clIDType"/>
      <element name="crID" type="eppcom:clIDType"/>
      <element name="crDate" type="dateTime"/>
      <element name="upID" type="eppcom:clIDType"

Hollenbeck Standards Track [Page 23] RFC 5732 EPP Host Mapping August 2009

       minOccurs="0"/>
      <element name="upDate" type="dateTime"
       minOccurs="0"/>
      <element name="trDate" type="dateTime"
       minOccurs="0"/>
    </sequence>
  </complexType>
 <!--
 Status is a combination of attributes and an optional human-readable
 message that may be expressed in languages other than English.
 -->
  <complexType name="statusType">
    <simpleContent>
      <extension base="normalizedString">
        <attribute name="s" type="host:statusValueType"
         use="required"/>
        <attribute name="lang" type="language"
         default="en"/>
      </extension>
    </simpleContent>
  </complexType>
  <simpleType name="statusValueType">
    <restriction base="token">
      <enumeration value="clientDeleteProhibited"/>
      <enumeration value="clientUpdateProhibited"/>
      <enumeration value="linked"/>
      <enumeration value="ok"/>
      <enumeration value="pendingCreate"/>
      <enumeration value="pendingDelete"/>
      <enumeration value="pendingTransfer"/>
      <enumeration value="pendingUpdate"/>
      <enumeration value="serverDeleteProhibited"/>
      <enumeration value="serverUpdateProhibited"/>
    </restriction>
  </simpleType>
 <!--
 Pending action notification response elements.
 -->
  <complexType name="panDataType">
    <sequence>
      <element name="name" type="host:paNameType"/>
      <element name="paTRID" type="epp:trIDType"/>
      <element name="paDate" type="dateTime"/>
    </sequence>
  </complexType>

Hollenbeck Standards Track [Page 24] RFC 5732 EPP Host Mapping August 2009

  <complexType name="paNameType">
    <simpleContent>
      <extension base="eppcom:labelType">
        <attribute name="paResult" type="boolean"
         use="required"/>
      </extension>
    </simpleContent>
  </complexType>
 <!--
 End of schema.
 -->
 </schema>
 END

5. Internationalization Considerations

 EPP is represented in XML, which provides native support for encoding
 information using the Unicode character set and its more compact
 representations including UTF-8.  Conformant XML processors recognize
 both UTF-8 and UTF-16 [RFC2781].  Though XML includes provisions to
 identify and use other character encodings through use of an
 "encoding" attribute in an <?xml?> declaration, use of UTF-8 is
 RECOMMENDED in environments where parser encoding support
 incompatibility exists.
 All date-time values presented via EPP MUST be expressed in Universal
 Coordinated Time using the Gregorian calendar.  XML Schema allows use
 of time zone identifiers to indicate offsets from the zero meridian,
 but this option MUST NOT be used with EPP.  The extended date-time
 form using upper case "T" and "Z" characters defined in
 [W3C.REC-xmlschema-2-20041028] MUST be used to represent date-time
 values, as XML Schema does not support truncated date-time forms or
 lower case "T" and "Z" characters.
 The syntax for domain and host names described in this document MUST
 conform to [RFC0952] and [RFC1123].  At the time of this writing, RFC
 3490 [RFC3490] describes a standard to use certain ASCII name labels
 to represent non-ASCII name labels.  These conformance requirements
 might change as a result of progressing work in developing standards
 for internationalized host names.

6. IANA Considerations

 This document uses URNs to describe XML namespaces and XML schemas
 conforming to a registry mechanism described in [RFC3688].  Two URI
 assignments have been registered by the IANA.

Hollenbeck Standards Track [Page 25] RFC 5732 EPP Host Mapping August 2009

 Registration request for the host namespace:
    URI: urn:ietf:params:xml:ns:host-1.0
    Registrant Contact: See the "Author's Address" section of this
    document.
    XML: None.  Namespace URIs do not represent an XML specification.
 Registration request for the host XML schema:
    URI: urn:ietf:params:xml:schema:host-1.0
    Registrant Contact: See the "Author's Address" section of this
    document.
    XML: See the "Formal Syntax" section of this document.

7. Security Considerations

 The object mapping described in this document does not provide any
 security services or introduce any additional considerations beyond
 those described by [RFC5730] or those caused by the protocol layers
 used by EPP.

8. Acknowledgements

 RFC 3732 is a product of the PROVREG working group, which suggested
 improvements and provided many invaluable comments.  The author
 wishes to acknowledge the efforts of WG chairs Edward Lewis and Jaap
 Akkerhuis for their process and editorial contributions.  RFC 4932
 and this document are individual submissions, based on the work done
 in RFC 3732.
 Specific suggestions that have been incorporated into this document
 were provided by Chris Bason, Jordyn Buchanan, Dave Crocker, Anthony
 Eden, Sheer El-Showk, Klaus Malorny, Dan Manley, Michael Mealling,
 Patrick Mevzek, and Rick Wesson.

9. References

9.1. Normative References

 [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791,
            September 1981.
 [RFC0952]  Harrenstien, K., Stahl, M., and E. Feinler, "DoD Internet
            host table specification", RFC 952, October 1985.

Hollenbeck Standards Track [Page 26] RFC 5732 EPP Host Mapping August 2009

 [RFC1034]  Mockapetris, P., "Domain names - concepts and facilities",
            STD 13, RFC 1034, November 1987.
 [RFC1035]  Mockapetris, P., "Domain names - implementation and
            specification", STD 13, RFC 1035, November 1987.
 [RFC1123]  Braden, R., "Requirements for Internet Hosts - Application
            and Support", STD 3, RFC 1123, October 1989.
 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119, March 1997.
 [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
            January 2004.
 [RFC4291]  Hinden, R. and S. Deering, "IP Version 6 Addressing
            Architecture", RFC 4291, February 2006.
 [RFC5730]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
            STD 69, RFC 5730, August 2009.
 [W3C.REC-xml-20040204]
            Sperberg-McQueen, C., Maler, E., Yergeau, F., Paoli, J.,
            and T. Bray, "Extensible Markup Language (XML) 1.0 (Third
            Edition)", World Wide Web Consortium FirstEdition REC-xml-
            20040204, February 2004,
            <http://www.w3.org/TR/2004/REC-xml-20040204>.
 [W3C.REC-xmlschema-1-20041028]
            Maloney, M., Thompson, H., Mendelsohn, N., and D. Beech,
            "XML Schema Part 1: Structures Second Edition", World Wide
            Web Consortium Recommendation REC-xmlschema-1-20041028,
            October 2004,
            <http://www.w3.org/TR/2004/REC-xmlschema-1-20041028>.
 [W3C.REC-xmlschema-2-20041028]
            Malhotra, A. and P. Biron, "XML Schema Part 2: Datatypes
            Second Edition", World Wide Web Consortium
            Recommendation REC-xmlschema-2-20041028, October 2004,
            <http://www.w3.org/TR/2004/REC-xmlschema-2-20041028>.

9.2. Informative References

 [RFC2781]  Hoffman, P. and F. Yergeau, "UTF-16, an encoding of ISO
            10646", RFC 2781, February 2000.

Hollenbeck Standards Track [Page 27] RFC 5732 EPP Host Mapping August 2009

 [RFC2874]  Crawford, M. and C. Huitema, "DNS Extensions to Support
            IPv6 Address Aggregation and Renumbering", RFC 2874,
            July 2000.
 [RFC3490]  Faltstrom, P., Hoffman, P., and A. Costello,
            "Internationalizing Domain Names in Applications (IDNA)",
            RFC 3490, March 2003.
 [RFC3596]  Thomson, S., Huitema, C., Ksinant, V., and M. Souissi,
            "DNS Extensions to Support IP Version 6", RFC 3596,
            October 2003.
 [RFC4932]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)
            Host Mapping", RFC 4932, May 2007.

Hollenbeck Standards Track [Page 28] RFC 5732 EPP Host Mapping August 2009

Appendix A. Changes from RFC 4932

 1.  Changed "This document obsoletes RFC 3732" to "This document
     obsoletes RFC 4932".
 2.  Replaced references to RFC 1886 with references to 3596.
 3.  Removed references to RFC 3152 since both it and 1886 have been
     obsoleted by 3596.
 4.  Replaced references to RFC 3732 with references to 4932.
 5.  Replaced references to RFC 4930 with references to 5730.
 6.  Added "Other notification methods MAY be used in addition to the
     required service message" in Section 3.2.
 7.  Added 2201 response code text in Section 3.2.
 8.  Added BSD license text to XML schema section.

Author's Address

 Scott Hollenbeck
 VeriSign, Inc.
 21345 Ridgetop Circle
 Dulles, VA  20166-6503
 US
 EMail: shollenbeck@verisign.com

Hollenbeck Standards Track [Page 29]

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