Network Working Group B. Hoeneisen
Request for Comments: 5076 SWITCH
Category: Standards Track December 2007
ENUM Validation Information Mapping
for the Extensible Provisioning Protocol
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.
Abstract
This document describes an Extensible Provisioning Protocol (EPP)
extension framework for mapping information about the validation
process that has been applied for the E.164 number (or number range)
that the E.164 Number Mapping (ENUM) domain name is based on.
Specified in the Extensible Markup Language (XML), this mapping
extends the EPP domain name mapping to provide an additional feature
required for the provisioning of ENUM Domain Names.
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Table of Contents
1. Introduction ....................................................2
2. Terminology .....................................................3
3. Requirements ....................................................4
4. Object Attributes ...............................................4
4.1. ENUM Domain Names ..........................................4
4.2. Validation Information Commands ............................4
4.3. Id .........................................................4
4.4. Validation Information .....................................5
4.5. Validation Elements in the Example .........................5
4.5.1. Method Identifier ...................................5
4.5.2. Validation Entity Identifier ........................5
4.5.3. Registrar Identifier ................................5
4.5.4. Execution Date ......................................6
4.5.5. Expiration Date .....................................6
5. EPP Command Mapping .............................................6
5.1. EPP Query Commands .........................................6
5.1.1. EPP Command .................................6
5.1.2. EPP Command ..................................6
5.1.3. EPP Command ..............................8
5.2. EPP Transform Commands .....................................9
5.2.1. EPP Command ................................9
5.2.2. EPP Command ...............................11
5.2.3. EPP Command ................................11
5.2.4. EPP Command .............................13
5.2.5. EPP Command ...............................15
6. Formal Syntax ..................................................16
7. IANA Considerations ............................................21
8. Security Considerations ........................................21
9. Acknowledgements ...............................................22
10. References ....................................................22
10.1. Normative References .....................................22
10.2. Informative References ...................................23
1. Introduction
This document describes a framework for an ENUM [2] validation
information mapping for version 1.0 of EPP [3]. This mapping, an
extension of the EPP domain name mapping described in [4], is
specified using XML 1.0, as described in [5], and XML Schema
notation, as described in [6] and [7].
The EPP core protocol specification [3] 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.
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ENUM [2] describes how the Domain Name System (DNS) can be used to
identify services associated with an E.164 number.
As described in RFC 4725 [9], usually only the Assignee of the E.164
number (or number range) has the right to register the corresponding
ENUM domain name. Therefore, an ENUM validation process has to be
applied before the ENUM domain name can be inserted into the DNS.
The validation process shall ensure that the holder of the ENUM
domain name coincides with the Assignee of the corresponding E.164
number (or number range). However, the details of the ENUM
validation methods are beyond the scope of this document.
The EPP extension described in this document specifies a framework
for the mapping of information about the ENUM validation process. As
the local legislation or the validation procedures may vary, the
content of the validation information itself is not part of this
specification.
However, this document contains a working example (including XML
schema) to show how the validation information could look. This
example could even be used for a lightweight validation process. In
fact, it has been an integral part of the Swiss ENUM trial.
Using this extension framework, the content of the validation
information can be specified according to the local requirements.
Such an extension is specified in [10].
More background information concerning the validation can be found in
RFC 4725 [9], which also describes a typical basic role model for the
ENUM registration process.
2. Terminology
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 RFC 2119 [1].
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 REQUIRED features of this specification.
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.
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3. Requirements
The following requirements are the basis for this work:
1. The design shall allow multiple policies and validation
procedures.
2. It shall be possible to transmit validation information with EPP
domain object requests and responses.
3. It shall be possible to add, modify, and remove validation
information.
4. It shall be possible to retrieve validation information stored in
the ENUM Registry.
4. Object Attributes
This extension adds additional elements to the EPP domain name
mapping [4]. Only new element descriptions are listed here.
4.1. ENUM Domain Names
An ENUM Domain Name is a representation of an E.164 number that has
been translated to conform to domain name syntax as described in the
ENUM specification [2].
4.2. Validation Information Commands
The following commands are defined for handling validation
information at the registry:
o add: to add new validation information
o rem: to revoke validation information
o chg: to change stored validation information
o inf: to get information about stored validation information
4.3. Id
The "id" attribute, used to identify the validation, is represented
in this mapping using a character string. It MUST be unique at least
within the same ENUM Domain Name. To ensure uniqueness even after a
transfer of an ENUM Domain Name, it is RECOMMENDED that the "id"
attribute be unique per ENUM Registry.
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The "id" attribute, usually assigned by the ENUM Registrar, is
required for revoking or changing stored validation information and
appears in the Validation Information Command elements (see Section
4.2).
4.4. Validation Information
The element can contain any element containing
validation information that is documented adequately. It is
represented in this mapping using the XML schema element and
therefore, is extensible.
The number of elements permitted per domain object
is subject to local policy.
4.5. Validation Elements in the Example
As described above, this document includes an example for a possible
content of validation information that is used in the EPP examples
throughout this document.
This example is an optional part of this specification, i.e., a fully
compliant RFC 5076 implementation does not need to implement this
example.
4.5.1. Method Identifier
The element is represented in this mapping using a
character string with a maximum length of 63 characters. It contains
an identifier for the method used for the validation. As stated in
Section 1, the details of the ENUM validation methods are beyond the
scope of this document.
4.5.2. Validation Entity Identifier
The element is represented in this mapping using
a character string with a length of 3 to 16 characters. It contains
an identifier assigned to the ENUM Validation Entity, e.g., by the
ENUM Registry.
4.5.3. Registrar Identifier
The element is represented in this mapping using a
character string with a length of 3 to 16 characters. It contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
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4.5.4. Execution Date
The element, the execution date of the validation, is
represented in this mapping using the XML Schema 'date' data type.
4.5.5. Expiration Date
The element, the expiration date of the validation,
is represented in this mapping using the XML Schema 'date' data type.
5. EPP Command Mapping
A detailed description of the EPP syntax and semantics can be found
in the EPP core protocol specification [3], and the EPP domain name
mapping is described in [4]. The command mappings described here are
specifically for use in implementing ENUM validation information
provisioning processes via EPP.
Note: Whether or not this extension is included into an EPP request
or response depends on local policy. For example, a local Registry
policy might require the use of this extension for EPP ,
, and commands, but not support it for EPP
and commands. Therefore, this is beyond the scope of this
document.
5.1. EPP Query Commands
EPP provides three commands to retrieve object information:
to determine if an object is known to the server, to retrieve
detailed information associated with an object, and to
retrieve object transfer status information.
5.1.1. EPP Command
This extension does not add any elements to the EPP command
or response described in the EPP domain mapping [4].
5.1.2. EPP Command
This extension does not add any elements to the EPP command
described in the EPP domain mapping [4]. Additional elements are
defined for the response.
When an command has been processed successfully, the EPP
element MUST contain child elements as described in the EPP
domain mapping [4]. In addition, the EPP element MUST
contain an element that identifies the extension
namespace. The element contains one or more
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elements, each with an "id" attribute identifying the
validation. Each element contains an element, which contains the validation information as
child element.
In the example below, the validation information consists of a
element that identifies the extension namespace.
The element contains the following child elements:
o An element that contains an identifier of the
validation method.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Validation Entity.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
o An element that contains the date that the
validation was performed.
o An OPTIONAL element that contains the
date that the validation expires.
Example for response:
S:
S:
S:
S:
S: Command completed successfully
S:
S:
S:
S: 5.1.5.1.8.6.2.4.4.1.4.e164.arpa
S: EXAMPLE1-REP
S: jd1234
S: sh8013
S: sh8013
S:
S: ns1.example.com
S: ns2.example.com
S:
S: ClientX
S: ClientY
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S: 1999-04-03T22:00:00.0Z
S: ClientX
S: 1999-12-03T09:00:00.0Z
S: 2005-04-03T22:00:00.0Z
S: 2000-04-08T09:00:00.0Z
S:
S: 2fooBAR
S:
S:
S:
S:
S:
S:
S:
S:
S: Validation-X
S: VE-NMQ
S: Client-X
S: 2004-04-08
S: 2004-10-07
S:
S:
S:
S:
S:
S:
S: ABC-23456
S: 54321-XYZ
S:
S:
S:
Figure 1
5.1.3. EPP Command
This extension does not add any elements to the EPP
command or response described in the EPP domain mapping
[4].
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5.2. EPP Transform Commands
EPP provides five commands to transform objects: to create
an instance of an object, to delete an instance of an
object, to extend the validity period of an object,
to manage object sponsorship changes, and to
change information associated with an object.
5.2.1. EPP Command
This extension defines additional elements for the EPP
command described in the EPP domain mapping [4]. No additional
elements are defined for the EPP response.
The EPP command provides a transform operation that allows a
client to create a domain object. In addition to the EPP command
elements described in the EPP domain mapping [4], the command MUST
contain an element. The element MUST contain
an element that identifies the extension namespace.
The element contains one or more
elements, each with an "id" attribute identifying the validation.
Each element contains an
element, which contains the validation information as child element.
In the example below, the validation information consists of a
element that identifies the extension namespace.
The element contains the following child elements:
o An element that contains an identifier of the
validation method.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Validation Entity.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
o An element that contains the date that the
validation was performed.
o An OPTIONAL element that contains the
date that the validation expires.
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Example for command:
C:
C:
C:
C:
C:
C: 5.1.5.1.8.6.2.4.4.1.4.e164.arpa
C: 1
C:
C: ns1.example.com
C: ns2.example.com
C:
C: jd1234
C: sh8013
C: sh8013
C:
C: 2fooBAR
C:
C:
C:
C:
C:
C:
C:
C:
C: Validation-X
C: VE-NMQ
C: Client-X
C: 2004-04-08
C: 2004-10-07
C:
C:
C:
C:
C:
C: ABC-12345
C:
C:
Figure 2
When an extended command has been processed successfully,
the EPP response is as described in the EPP domain mapping [4].
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5.2.2. EPP Command
This extension does not add any elements to the EPP command
or response described in the EPP domain mapping [4].
5.2.3. EPP Command
This extension defines additional elements for the EPP
command described in the EPP domain mapping [4]. No additional
elements are defined for the EPP response.
The EPP command provides a transform operation that allows a
client to extend the validity period of a domain object. In addition
to the EPP command elements described in the EPP domain mapping [4],
the command MUST contain an element. The
element MUST contain an element that
identifies the extension namespace. The element
contains one or more elements, each with an "id"
attribute identifying the validation. Each element
contains an element, which contains the
validation information as child element.
In the example below, the validation information consists of a
element that identifies the extension namespace.
The contains the following child elements:
o An element that contains an identifier of the
validation method.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Validation Entity.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
o An element that contains the date that the
validation was performed.
o An OPTIONAL element that contains the
date that the validation expires.
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RFC 5076 ENUM Validation Mapping for EPP December 2007
Example for command:
C:
C:
C:
C:
C:
C: 5.1.5.1.8.6.2.4.4.1.4.e164.arpa
C: 2005-04-09
C: 1
C:
C:
C:
C:
C:
C:
C:
C: Validation-X
C: VE-NMQ
C: Client-X
C: 2005-03-30
C: 2005-09-29
C:
C:
C:
C:
C:
C: ABC-45678
C:
C:
Figure 3
When an extended command has been processed successfully, the
EPP response is as described in the EPP domain mapping [4].
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5.2.4. EPP Command
This extension defines additional elements for the EPP
command described in the EPP domain mapping [4]. No additional
elements are defined for the EPP response.
The EPP command provides a transform operation that allows
a client to manage requests to transfer the sponsorship of a domain
object. Clients can initiate, cancel, approve, and reject a transfer
request.
In case of a transfer request, in addition to the EPP command
elements described in the EPP domain mapping [4], the command MUST
contain an element. The element MUST contain
an element that identifies the extension
namespace. The element contains one or more
elements, each with an "id" attribute identifying the
validation. Each element contains an element, which contains the validation information as
child element.
In the example below, the validation information consists of a
element that identifies the extension namespace.
The contains the following child elements:
o An element that contains an identifier of the
validation method.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Validation Entity.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
o An element that contains the date that the
validation was performed.
o An OPTIONAL element that contains the
date that the validation expires.
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RFC 5076 ENUM Validation Mapping for EPP December 2007
Example for command:
C:
C:
C:
C:
C:
C: 5.1.5.1.8.6.2.4.4.1.4.e164.arpa
C:
C: 2fooBAR
C:
C:
C:
C:
C:
C:
C:
C:
C: Validation-Y
C: VE2-LMQ
C: Client-Y
C: 2005-01-22
C: 2005-07-21
C:
C:
C:
C:
C:
C: XYZ-54789
C:
C:
Figure 4
When an extended command has been processed successfully,
the EPP response is as described in the EPP domain mapping [4].
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5.2.5. EPP Command
This extension defines additional elements for the EPP
command described in the EPP domain mapping [4]. No additional
elements are defined for the EPP response. The EPP
command provides a transform operation that allows a client to change
the state of a domain object. In addition to the EPP command
elements described in the EPP domain mapping [4], the
command MUST contain an element. The element
MUST contain an element that identifies the
extension namespace. The element contains one or
more , , or elements, each
with an "id" attribute identifying the validation. Each
and element contains an element, which contains the validation information as
child element. elements do not have child elements.
In the example below, the validation information consists of a
element that identifies the extension namespace.
The contains the following child elements:
o An element that contains an identifier of the
validation method.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Validation Entity.
o An OPTIONAL element that contains an
identifier assigned to the ENUM Registrar by the ENUM Registry.
o An element that contains the date that the
validation was performed.
o An OPTIONAL element that contains the
date that the validation expires.
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Example for command:
C:
C:
C:
C:
C:
C: 5.1.5.1.8.6.2.4.4.1.4.e164.arpa
C:
C:
C:
C:
C:
C:
C:
C: Validation-X
C: VE-NMQ
C: Client-X
C: 2004-10-02
C: 2005-04-01
C:
C:
C:
C:
C:
C: ABC-34567
C:
C:
Figure 5
When an extended command has been processed successfully,
the EPP response is as described in the EPP domain mapping [4].
6. 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 schemas; they
are used to note the beginning and ending of the schema for URI
registration purposes.
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Formal syntax for Framework:
BEGIN
Extensible Provisioning Protocol v1.0
domain name extension schema for framework for
provisioning of E.164 number validation information.
END
Figure 6
Formal syntax for a simple validation (example):
BEGIN
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Example for E.164 number validation information.
END
Figure 7
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7. IANA Considerations
This document uses Uniform Resource Names (URNs) to describe XML
namespaces and XML schemas conforming to the registry mechanism
described in RFC 3688 [8]. Four URI assignments have been made:
1. Registration for the extension namespace:
* URI: urn:ietf:params:xml:ns:e164val-1.0
* Registrant Contact: See the "Author's Address" section of this
document.
* XML: None. Namespace URIs do not represent an XML
specification.
2. Registration for the extension XML schema:
* URI: urn:ietf:params:xml:schema:e164val-1.0
* Registrant Contact: See the "Author's Address" section of this
document.
* XML: See Section 6, "Formal Syntax", of this document.
3. Registration for the extension namespace:
* URI: urn:ietf:params:xml:ns:e164valex-1.1
* Registrant Contact: See the "Author's Address" section of this
document.
* XML: None. Namespace URIs do not represent an XML
specification.
4. Registration for the extension XML schema:
* URI: urn:ietf:params:xml:schema:e164valex-1.1
* Registrant Contact: See the "Author's Address" section of this
document.
* XML: See Section 6, "Formal Syntax", of this document.
8. Security Considerations
The mapping extensions described in this document do not provide any
security services beyond those described by EPP [3], the EPP domain
name mapping [4], and protocol layers used by EPP. Security
considerations related to ENUM are described in the "Security
Considerations" section of the ENUM specification [2]. The security
considerations described in these other specifications apply to this
specification as well.
Validation information often contains sensitive personal information.
It is RECOMMENDED that validation information in the response
is only provided to the sponsoring client.
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9. Acknowledgements
The author would like to thank the following people who have provided
feedback or significant contributions to the development of this
document: Alfred Hoenes, Helena Malmborg, Alexander Mayrhofer, Andrew
Newton, Marcel Parodi, Patrik Schaefer, and Patrick Zenklusen.
RFC 4114 [11] has been used as a template for this document. The
structure and those paragraphs that apply to both documents have
been taken over from [11]. The author would like to thank Scott
Hollenbeck for this great spadework.
10. References
10.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[2] Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource
Identifiers (URI) Dynamic Delegation Discovery System (DDDS)
Application (ENUM)", RFC 3761, April 2004.
[3] Hollenbeck, S., "Extensible Provisioning Protocol (EPP)", RFC
3730, March 2004.
[4] Hollenbeck, S., "Extensible Provisioning Protocol (EPP) Domain
Name Mapping", RFC 3731, March 2004.
[5] Paoli, J., Maler, E., Bray, T., and C. Sperberg-McQueen,
"Extensible Markup Language (XML) 1.0 (Second Edition)", World
Wide Web Consortium FirstEdition REC-xml-20001006, October
2000, .
[6] Thompson, H., Maloney, M., Mendelsohn, N., and D. Beech, "XML
Schema Part 1: Structures Second Edition", World Wide Web
Consortium Recommendation REC-xmlschema-1-20041028, October
2004, .
[7] Biron, P. and A. Malhotra, "XML Schema Part 2: Datatypes
Second Edition", World Wide Web Consortium Recommendation REC-
xmlschema-2-20041028, October 2004,
.
[8] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
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10.2. Informative References
[9] Mayrhofer, A. and B. Hoeneisen, "ENUM Validation
Architecture", RFC 4725, November 2006.
[10] Lendl, O., "ENUM Validation Token Format Definition", Work in
Progress.
[11] Hollenbeck, S., "E.164 Number Mapping for the Extensible
Provisioning Protocol (EPP)", RFC 4114, June 2005.
Author's Address
Bernie Hoeneisen
SWITCH
Werdstrasse 2
CH-8004 Zuerich
Switzerland
Phone: +41 44 268 1515
EMail: bernhard.hoeneisen@switch.ch, bernie@ietf.hoeneisen.ch
URI: http://www.switch.ch/
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Full Copyright Statement
Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
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OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
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RFC, FYI, BCP