Internet Engineering Task Force (IETF)                          J. Gould
Request for Comments: 8495                                VeriSign, Inc.
Category: Standards Track                                       K. Feher
ISSN: 2070-1721                                                  Neustar
                                                          November 2018


                      Allocation Token Extension
            for the Extensible Provisioning Protocol (EPP)

Abstract

  This document describes an Extensible Provisioning Protocol (EPP)
  extension for including an Allocation Token in "query" and
  "transform" commands.  The Allocation Token is used as a credential
  that authorizes a client to request the allocation of a specific
  object from the server using one of the EPP transform commands,
  including "create" and "transfer".

Status of This Memo

  This is an Internet Standards Track document.

  This document is a product of the Internet Engineering Task Force
  (IETF).  It represents the consensus of the IETF community.  It has
  received public review and has been approved for publication by the
  Internet Engineering Steering Group (IESG).  Further information on
  Internet Standards is available in Section 2 of RFC 7841.

  Information about the current status of this document, any errata,
  and how to provide feedback on it may be obtained at
  https://www.rfc-editor.org/info/rfc8495.

Copyright Notice

  Copyright (c) 2018 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
  (https://trustee.ietf.org/license-info) in effect on the date of
  publication of this document.  Please review these documents
  carefully, as they describe your rights and restrictions with respect
  to this document.  Code Components extracted from this document must
  include Simplified BSD License text as described in Section 4.e of
  the Trust Legal Provisions and are provided without warranty as
  described in the Simplified BSD License.




Gould & Feher                Standards Track                    [Page 1]

RFC 8495                    Allocation Token               November 2018


Table of Contents

  1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
    1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
  2.  Object Attributes . . . . . . . . . . . . . . . . . . . . . .   3
    2.1.  Allocation Token  . . . . . . . . . . . . . . . . . . . .   4
  3.  EPP Command Mapping . . . . . . . . . . . . . . . . . . . . .   4
    3.1.  EPP Query Commands  . . . . . . . . . . . . . . . . . . .   4
      3.1.1.  EPP <check> Command . . . . . . . . . . . . . . . . .   4
      3.1.2.  EPP <info> Command  . . . . . . . . . . . . . . . . .   8
      3.1.3.  EPP <transfer> Query Command  . . . . . . . . . . . .  10
    3.2.  EPP Transform Commands  . . . . . . . . . . . . . . . . .  11
      3.2.1.  EPP <create> Command  . . . . . . . . . . . . . . . .  11
      3.2.2.  EPP <delete> Command  . . . . . . . . . . . . . . . .  12
      3.2.3.  EPP <renew> Command . . . . . . . . . . . . . . . . .  12
      3.2.4.  EPP <transfer> Command  . . . . . . . . . . . . . . .  12
      3.2.5.  EPP <update> Command  . . . . . . . . . . . . . . . .  13
  4.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  14
    4.1.  Allocation Token Extension Schema . . . . . . . . . . . .  14
  5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
    5.1.  XML Namespace . . . . . . . . . . . . . . . . . . . . . .  15
    5.2.  EPP Extension Registry  . . . . . . . . . . . . . . . . .  15
  6.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
  7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
    7.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
    7.2.  Informative References  . . . . . . . . . . . . . . . . .  17
  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  17
  Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

  This document describes an extension mapping for version 1.0 of the
  Extensible Provisioning Protocol (EPP) [RFC5730].  This mapping,
  which is an extension to EPP object mappings similar to the EPP
  domain name mapping [RFC5731], supports passing an Allocation Token
  as a credential that authorizes a client to request the allocation of
  a specific object from the server using one of the EPP transform
  commands, including "create" and "transfer".

  Allocation is when a server assigns the sponsoring client of an
  object based on the use of an Allocation Token credential.  Examples
  include allocating a registration based on a pre-eligibility
  Allocation Token, allocating a premium domain name registration based
  on an auction Allocation Token, allocating a registration based on a
  founders Allocation Token, and allocating an existing domain name
  held by the server or by a different sponsoring client based on an
  Allocation Token that is passed with a transfer command.




Gould & Feher                Standards Track                    [Page 2]

RFC 8495                    Allocation Token               November 2018


  Clients pass an Allocation Token to the server for validation, and
  the server determines if the supplied Allocation Token is one
  supported by the server.  It is up to server policy which EPP
  transform commands and which objects require the Allocation Token.
  The Allocation Token MAY be returned to an authorized client for
  passing out-of-band to a client that uses it with an EPP transform
  command.

1.1.  Conventions Used in This Document

  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
  "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
  "OPTIONAL" in this document are to be interpreted as described in
  BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
  capitals, as shown here.

  XML is case sensitive.  Unless stated otherwise, XML specifications
  and examples provided in this document MUST be interpreted in the
  character case presented in order to develop a conforming
  implementation.

  In examples, "C:" represents lines sent by a protocol client and "S:"
  represents lines returned by a protocol server.  Indentation and
  white space in the examples are provided only to illustrate element
  relationships and are not REQUIRED in the protocol.

  The XML namespace prefix "allocationToken" is used for the namespace
  "urn:ietf:params:xml:ns:allocationToken-1.0", but implementations
  MUST NOT depend on it and instead employ a proper namespace-aware XML
  parser and serializer to interpret and output the XML documents.

  The "abc123" token value is used as a placeholder value in the
  examples.  The server MUST support token values that follow the
  Security Considerations (Section 6).

  The domain-object attribute values, including the "2fooBAR"
  <domain:pw> value, in the examples are provided for illustration
  purposes only.  Refer to [RFC5731] for details on the domain-object
  attributes.

2.  Object Attributes

  This extension adds additional elements to EPP object mappings
  similar to the EPP domain name mapping [RFC5731].  Only those new
  elements are described here.






Gould & Feher                Standards Track                    [Page 3]

RFC 8495                    Allocation Token               November 2018


2.1.  Allocation Token

  The Allocation Token is a simple XML "token" type.  The exact format
  of the Allocation Token is up to server policy.  The server MAY have
  the Allocation Token for each object to match against the Allocation
  Token passed by the client to authorize the allocation of the object.
  The <allocationToken:allocationToken> element is used for all of the
  supported EPP commands as well as the info response.  If the supplied
  Allocation Token passed to the server does not apply to the object,
  the server MUST return an EPP error result code of 2201.

  Authorization information, similar to what is defined in the EPP
  domain name mapping [RFC5731], is associated with objects to
  facilitate transfer operations.  The authorization information is
  assigned when an object is created.  The Allocation Token and the
  authorization information are both credentials but are used for
  different purposes and in different ways.  The Allocation Token is
  used to facilitate the allocation of an object instead of
  transferring the sponsorship of the object.  The Allocation Token is
  not managed by the client but is validated by the server to authorize
  assigning the initial sponsoring client of the object.

  An example <allocationToken:allocationToken> element with value of
  "abc123":

  <allocationToken:allocationToken xmlns:allocationToken=
            "urn:ietf:params:xml:ns:allocationToken-1.0">
    abc123
  </allocationToken:allocationToken>

3.  EPP Command Mapping

  A detailed description of the EPP syntax and semantics can be found
  in the EPP core protocol specification [RFC5730].

3.1.  EPP Query Commands

  EPP provides three commands to retrieve object information: <check>
  to determine if an object can be provisioned, <info> to retrieve
  information associated with an object, and <transfer> to retrieve
  object-transfer status information.

3.1.1.  EPP <check> Command

  This extension defines additional elements to extend the EPP <check>
  command of an object mapping similar to the mapping specified in
  [RFC5731].




Gould & Feher                Standards Track                    [Page 4]

RFC 8495                    Allocation Token               November 2018


  This extension allows clients to check the availability of an object
  with an Allocation Token, as described in Section 2.1.  Clients can
  check if an object can be created using the Allocation Token.  The
  Allocation Token is applied to all object names included in the EPP
  <check> command.

  The following is an example <check> command for the
  allocation.example domain name using the
  <allocationToken:allocationToken> extension with the allocation token
  of 'abc123':

  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:      <domain:check
  C:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  C:        <domain:name>allocation.example</domain:name>
  C:      </domain:check>
  C:    </check>
  C:    <extension>
  C:      <allocationToken:allocationToken
  C:        xmlns:allocationToken=
  C:          "urn:ietf:params:xml:ns:allocationToken-1.0">
  C:        abc123
  C:      </allocationToken:allocationToken>
  C:    </extension>
  C:    <clTRID>ABC-12345</clTRID>
  C:  </command>
  C:</epp>

  If the query was successful, the server replies with a <check>
  response providing the availability status of the queried object
  based on the following Allocation Token cases where the object is
  otherwise available:

  1.  If an object requires an Allocation Token and the Allocation
      Token does apply to the object, then the server MUST return the
      availability status as available (e.g., the "avail" attribute is
      "1" or "true").
  2.  If an object requires an Allocation Token and the Allocation
      Token does not apply to the object, then the server SHOULD return
      the availability status as unavailable (e.g., the "avail"
      attribute is "0" or "false").
  3.  If an object does not require an Allocation Token, the server MAY
      return the availability status as available (e.g., the "avail"
      attribute is "1" or "true").




Gould & Feher                Standards Track                    [Page 5]

RFC 8495                    Allocation Token               November 2018


  The following is an example <check> domain response for a <check>
  command using the <allocationToken:allocationToken> extension:

  S:<?xml version="1.0" encoding="UTF-8"?>
  S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
  S: <response>
  S:  <result code="1000">
  S:   <msg lang="en-US">Command completed successfully</msg>
  S:  </result>
  S:  <resData>
  S:   <domain:chkData
  S:     xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  S:    <domain:cd>
  S:     <domain:name avail="1">allocation.example</domain:name>
  S:    </domain:cd>
  S:   </domain:chkData>
  S:  </resData>
  S:  <trID>
  S:   <clTRID>ABC-DEF-12345</clTRID>
  S:   <svTRID>54321-XYZ</svTRID>
  S:  </trID>
  S: </response>
  S:</epp>




























Gould & Feher                Standards Track                    [Page 6]

RFC 8495                    Allocation Token               November 2018


  The following is an example <check> command with the
  <allocationToken:allocationToken> extension for the
  allocation.example and allocation2.example domain names.
  Availability of allocation.example and allocation2.example domain
  names are based on the Allocation Token 'abc123':

  C:<?xml version="1.0" encoding="UTF-8"?>
  C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
  C: <command>
  C:  <check>
  C:   <domain:check
  C:     xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  C:    <domain:name>allocation.example</domain:name>
  C:    <domain:name>allocation2.example</domain:name>
  C:   </domain:check>
  C:  </check>
  C:  <extension>
  C:   <allocationToken:allocationToken
  C:     xmlns:allocationToken=
  C:       "urn:ietf:params:xml:ns:allocationToken-1.0">
  C:     abc123
  C:   </allocationToken:allocationToken>
  C:  </extension>
  C:  <clTRID>ABC-DEF-12345</clTRID>
  C: </command>
  C:</epp>

























Gould & Feher                Standards Track                    [Page 7]

RFC 8495                    Allocation Token               November 2018


  The following is an example <check> domain response for multiple
  domain names in the <check> command using the
  <allocationToken:allocationToken> extension, where the Allocation
  Token 'abc123' matches allocation.example but does not match
  allocation2.example:

  S:<?xml version="1.0" encoding="UTF-8"?>
  S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
  S: <response>
  S:  <result code="1000">
  S:   <msg lang="en-US">Command completed successfully</msg>
  S:  </result>
  S:  <resData>
  S:   <domain:chkData
  S:     xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  S:    <domain:cd>
  S:     <domain:name avail="1">allocation.example</domain:name>
  S:    </domain:cd>
  S:    <domain:cd>
  S:     <domain:name avail="0">allocation2.example</domain:name>
  S:     <domain:reason>Allocation Token mismatch</domain:reason>
  S:    </domain:cd>
  S:   </domain:chkData>
  S:  </resData>
  S:  <trID>
  S:   <clTRID>ABC-DEF-12345</clTRID>
  S:   <svTRID>54321-XYZ</svTRID>
  S:  </trID>
  S: </response>
  S:</epp>

  This extension does not add any elements to the EPP <check> response
  described in [RFC5730].

3.1.2.  EPP <info> Command

  This extension defines additional elements to extend the EPP <info>
  command of an object mapping similar to the mapping specified in
  [RFC5731].

  The EPP <info> command allows a client to request information
  associated with an existing object.  Authorized clients MAY retrieve
  the Allocation Token (Section 2.1) along with the other object
  information by supplying the <allocationToken:info> element in the
  command.  The <allocationToken:info> element is an empty element that
  serves as a marker to the server to return the
  <allocationToken:allocationToken> element in the info response.  If
  the client is not authorized to receive the Allocation Token, the



Gould & Feher                Standards Track                    [Page 8]

RFC 8495                    Allocation Token               November 2018


  server MUST return an EPP error result code of 2201.  If the client
  is authorized to receive the Allocation Token, but there is no
  Allocation Token associated with the object, the server MUST return
  an EPP error result code of 2303.  The authorization is subject to
  server policy.

  The following is an example <info> command with the
  allocationToken:info extension for the allocation.example domain
  name:

  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:    <domain:info
  C:      xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  C:      <domain:name>allocation.example</domain:name>
  C:    </domain:info>
  C:   </info>
  C:   <extension>
  C:      <allocationToken:info
  C:        xmlns:allocationToken=
  C:          "urn:ietf:params:xml:ns:allocationToken-1.0"/>
  C:   </extension>
  C:   <clTRID>ABC-12345</clTRID>
  C:  </command>
  C:</epp>

  If the query was successful, the server replies with an
  <allocationToken:allocationToken> element along with the regular EPP
  <resData>.  The <allocationToken:allocationToken> element is
  described in Section 2.1.



















Gould & Feher                Standards Track                    [Page 9]

RFC 8495                    Allocation Token               November 2018


  The following is an example <info> domain response using the
  <allocationToken:allocationToken> extension:

  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:      <domain:infData
  S:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  S:        <domain:name>allocation.example</domain:name>
  S:        <domain:roid>EXAMPLE1-REP</domain:roid>
  S:        <domain:status s="pendingCreate"/>
  S:        <domain:registrant>jd1234</domain:registrant>
  S:        <domain:contact type="admin">sh8013</domain:contact>
  S:        <domain:contact type="tech">sh8013</domain:contact>
  S:        <domain:clID>ClientX</domain:clID>
  S:        <domain:crID>ClientY</domain:crID>
  S:        <domain:crDate>2012-04-03T22:00:00.0Z</domain:crDate>
  S:        <domain:authInfo>
  S:          <domain:pw>2fooBAR</domain:pw>
  S:        </domain:authInfo>
  S:      </domain:infData>
  S:    </resData>
  S:    <extension>
  S:      <allocationToken:allocationToken
  S:        xmlns:allocationToken=
  S:          "urn:ietf:params:xml:ns:allocationToken-1.0">
  S:        abc123
  S:      </allocationToken:allocationToken>
  S:    </extension>
  S:    <trID>
  S:      <clTRID>ABC-12345</clTRID>
  S:      <svTRID>54321-XYZ</svTRID>
  S:    </trID>
  S:  </response>
  S:</epp>

3.1.3.  EPP <transfer> Query Command

  This extension does not add any elements to the EPP <transfer> query
  command or <transfer> query response described in [RFC5730].







Gould & Feher                Standards Track                   [Page 10]

RFC 8495                    Allocation Token               November 2018


3.2.  EPP Transform Commands

  EPP provides five commands to transform objects: <create> to create
  an instance of an object, <delete> to delete an instance of an
  object, <renew> to extend the validity period of an object,
  <transfer> to manage object sponsorship changes, and <update> to
  change information associated with an object.

3.2.1.  EPP <create> Command

  This extension defines additional elements to extend the EPP <create>
  command of an object mapping similar to the mapping specified in
  [RFC5731].

  The EPP <create> command provides a transform operation that allows a
  client to create an instance of an object.  In addition to the EPP
  command elements described in an object mapping similar to the
  mapping specified in [RFC5731], the command MUST contain a child
  <allocationToken:allocationToken> element for the client to be
  authorized to create and allocate the object.  If the Allocation
  Token does not apply to the object, the server MUST return an EPP
  error result code of 2201.





























Gould & Feher                Standards Track                   [Page 11]

RFC 8495                    Allocation Token               November 2018


  The following is an example <create> command to create a domain
  object with an Allocation Token:

  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:      <domain:create
  C:       xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  C:        <domain:name>allocation.example</domain:name>
  C:        <domain:registrant>jd1234</domain:registrant>
  C:        <domain:contact type="admin">sh8013</domain:contact>
  C:        <domain:contact type="tech">sh8013</domain:contact>
  C:        <domain:authInfo>
  C:          <domain:pw>2fooBAR</domain:pw>
  C:        </domain:authInfo>
  C:      </domain:create>
  C:    </create>
  C:    <extension>
  C:      <allocationToken:allocationToken
  C:        xmlns:allocationToken=
  C:          "urn:ietf:params:xml:ns:allocationToken-1.0">
  C:        abc123
  C:      </allocationToken:allocationToken>
  C:    </extension>
  C:    <clTRID>ABC-12345</clTRID>
  C:  </command>
  C:</epp>

  This extension does not add any elements to the EPP <create> response
  described in [RFC5730].

3.2.2.  EPP <delete> Command

  This extension does not add any elements to the EPP <delete> command
  or <delete> response described in [RFC5730].

3.2.3.  EPP <renew> Command

  This extension does not add any elements to the EPP <renew> command
  or <renew> response described in [RFC5730].

3.2.4.  EPP <transfer> Command

  This extension defines additional elements to extend the EPP
  <transfer> command of an object mapping similar to the mapping
  specified in [RFC5731].




Gould & Feher                Standards Track                   [Page 12]

RFC 8495                    Allocation Token               November 2018


  The EPP <transfer> command provides a transform operation that allows
  a client to request the transfer of an object.  In addition to the
  EPP command elements described in an object mapping similar to the
  mapping specified in [RFC5731], the command MUST contain a child
  <allocationToken:allocationToken> element for the client to be
  authorized to transfer and allocate the object.  The authorization
  associated with the Allocation Token is in addition to, and does not
  replace, the authorization mechanism defined for the object's
  <transfer> command.  If the Allocation Token is invalid or not
  required for the object, the server MUST return an EPP error result
  code of 2201.

  The following is an example <transfer> command to allocate the domain
  object with the Allocation Token:

  C:<?xml version="1.0" encoding="UTF-8" standalone="no"?>
  C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
  C:  <command>
  C:    <transfer op="request">
  C:      <domain:transfer
  C:        xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
  C:        <domain:name>example1.tld</domain:name>
  C:        <domain:period unit="y">1</domain:period>
  C:        <domain:authInfo>
  C:          <domain:pw>2fooBAR</domain:pw>
  C:        </domain:authInfo>
  C:      </domain:transfer>
  C:    </transfer>
  C:    <extension>
  C:      <allocationToken:allocationToken
  C:        xmlns:allocationToken=
  C:          "urn:ietf:params:xml:ns:allocationToken-1.0">
  C:        abc123
  C:      </allocationToken:allocationToken>
  C:    </extension>
  C:    <clTRID>ABC-12345</clTRID>
  C:  </command>
  C:</epp>

  This extension does not add any elements to the EPP <transfer>
  response described in [RFC5730].

3.2.5.  EPP <update> Command

  This extension does not add any elements to the EPP <update> command
  or <update> response described in [RFC5730].





Gould & Feher                Standards Track                   [Page 13]

RFC 8495                    Allocation Token               November 2018


4.  Formal Syntax

  One schema is presented here: the EPP Allocation Token Extension
  schema.

  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.

4.1.  Allocation Token Extension Schema

  BEGIN
  <?xml version="1.0" encoding="UTF-8"?>
  <schema xmlns="http://www.w3.org/2001/XMLSchema"
    xmlns:allocationToken="urn:ietf:params:xml:ns:allocationToken-1.0"
    targetNamespace="urn:ietf:params:xml:ns:allocationToken-1.0"
    elementFormDefault="qualified">
    <annotation>
      <documentation>
        Extensible Provisioning Protocol v1.0
        Allocation Token Extension
      </documentation>
    </annotation>

    <!-- Element used in info command to get allocation token. -->
    <element name="info">
      <complexType>
        <complexContent>
          <restriction base="anyType" />
        </complexContent>
      </complexType>
    </element>

    <!-- Allocation Token used in transform
      commands and info response -->
    <element name="allocationToken"
      type="allocationToken:allocationTokenType" />
    <simpleType name="allocationTokenType">
      <restriction base="token">
        <minLength value="1" />
      </restriction>
    </simpleType>

  <!-- End of schema. -->
  </schema>
  END



Gould & Feher                Standards Track                   [Page 14]

RFC 8495                    Allocation Token               November 2018


5.  IANA Considerations

5.1.  XML Namespace

  This document uses URNs to describe XML namespaces and XML schemas
  conforming to a registry mechanism described in [RFC3688].

  The allocationToken namespace has been registered as follows.

     URI: urn:ietf:params:xml:ns:allocationToken-1.0
     Registrant Contact: IESG
     XML: None.  Namespace URIs do not represent an XML specification.

  The allocationToken XML schema has been registered as follows.

     URI: urn:ietf:params:xml:schema:allocationToken-1.0
     Registrant Contact: IESG
     XML: See the "Formal Syntax" section of this document.

5.2.  EPP Extension Registry

  The following entry has been added to the Extensions for the
  Extensible Provisioning Protocol (EPP) registry, as described in
  [RFC7451].

  Name of Extension: Allocation Token Extension for the Extensible
  Provisioning Protocol (EPP)

  Document Status: Standards Track

  Reference: RFC 8495

  Registrant: IESG <[email protected]>

  TLDs: Any

  IPR Disclosure: None

  Status: Active

  Notes: None

6.  Security Considerations

  The mapping described in this document does not provide any security
  services beyond those described by EPP [RFC5730] and protocol layers
  used by EPP.  The security considerations described in these other
  specifications apply to this specification as well.



Gould & Feher                Standards Track                   [Page 15]

RFC 8495                    Allocation Token               November 2018


  The mapping acts as a conduit for the passing of Allocation Tokens
  between a client and a server.  The definition of the Allocation
  Token SHOULD be defined outside of this mapping.  The following are
  security considerations in the definition and use of an Allocation
  Token:

  1.  An Allocation Token should be considered secret information by
      the client; it SHOULD be protected at rest and MUST be protected
      in transit.
  2.  An Allocation Token should be single use, meaning it should be
      unique per object and per allocation operation.
  3.  An Allocation Token should have a limited life with some form of
      expiry in the Allocation Token, if generated by a trusted third
      party, or with a server-side expiry, if generated by the server.
  4.  An Allocation Token should use a strong random value if it is
      based on an unsigned code.
  5.  An Allocation Token should leverage digital signatures to confirm
      its authenticity if generated by a trusted third party.
  6.  An Allocation Token that is signed XML should be encoded (e.g.,
      base64 [RFC4648]) to mitigate server validation issues.

7.  References

7.1.  Normative References

  [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119,
             DOI 10.17487/RFC2119, March 1997,
             <https://www.rfc-editor.org/info/rfc2119>.

  [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
             DOI 10.17487/RFC3688, January 2004,
             <https://www.rfc-editor.org/info/rfc3688>.

  [RFC5730]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
             STD 69, RFC 5730, DOI 10.17487/RFC5730, August 2009,
             <https://www.rfc-editor.org/info/rfc5730>.

  [RFC5731]  Hollenbeck, S., "Extensible Provisioning Protocol (EPP)
             Domain Name Mapping", STD 69, RFC 5731,
             DOI 10.17487/RFC5731, August 2009,
             <https://www.rfc-editor.org/info/rfc5731>.

  [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
             2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
             May 2017, <https://www.rfc-editor.org/info/rfc8174>.





Gould & Feher                Standards Track                   [Page 16]

RFC 8495                    Allocation Token               November 2018


7.2.  Informative References

  [RFC4648]  Josefsson, S., "The Base16, Base32, and Base64 Data
             Encodings", RFC 4648, DOI 10.17487/RFC4648, October 2006,
             <https://www.rfc-editor.org/info/rfc4648>.

  [RFC7451]  Hollenbeck, S., "Extension Registry for the Extensible
             Provisioning Protocol", RFC 7451, DOI 10.17487/RFC7451,
             February 2015, <https://www.rfc-editor.org/info/rfc7451>.

Acknowledgements

  The authors wish to acknowledge the original concept for this
  document and the efforts in the initial draft versions of this
  document by Trung Tran and Sharon Wodjenski.

  Special suggestions that have been incorporated into this document
  were provided by Ben Campbell, Scott Hollenbeck, Benjamin Kaduk,
  Mirja Kuehlewind, Rubens Kuhl, Alexander Mayrhofer, Patrick Mevzek,
  Eric Rescoria, and Adam Roach.

Authors' Addresses

  James Gould
  VeriSign, Inc.
  12061 Bluemont Way
  Reston, VA  20190
  United States of America

  Email: [email protected]
  URI:   http://www.verisign.com


  Kal Feher
  Neustar
  lvl 8/10 Queens Road
  Melbourne, VIC  3004
  Australia

  Email: [email protected]
  URI:   http://www.neustar.biz










Gould & Feher                Standards Track                   [Page 17]