Relay Extension for the Extensible Provisioning Protocol
draft-ietf-eppext-keyrelay-01
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| Document | Type | Active Internet-Draft (eppext WG) | |
|---|---|---|---|
| Authors | M. Groeneweg , Antoin Verschuren | ||
| Last updated | 2015-01-08 | ||
| Replaces | draft-gieben-epp-keyrelay | ||
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draft-ietf-eppext-keyrelay-01
eppext R. Gieben
Internet-Draft Google
Intended status: Standards Track M. Groeneweg
Expires: July 12, 2015 H. Ribbers
SIDN Labs
A. Verschuren
January 8, 2015
Relay Extension for the Extensible Provisioning Protocol
draft-ietf-eppext-keyrelay-01
Abstract
This document describes a generic Extensible Provisioning Protocol
(EPP) extension for the purpose of relaying data between registrars.
Furthermore, this document describes a specific implementation for
relaying DNSSEC key material between DNS operators (by means of their
respective registrars), to facilitate the change of DNS operator,
while keeping the DNSSEC chain of trust intact.
This I-D introduces a new generic command <relay> and an element
<relayData>. For the specific implementation of relaying DNSSEC key
material it introduces an extension of the <relayData> with a
<keyRelayData> element.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 12, 2015.
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Copyright Notice
Copyright (c) 2015 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Conventions Used in This Document . . . . . . . . . . . . 3
1.2. Relaying Data . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1. Rationale For a New Command . . . . . . . . . . . . . 4
1.2.2. Extending <relayData> per use case . . . . . . . . . 4
1.3. Secure Transfer of DNSSEC Key Material . . . . . . . . . 4
2. Object Attributes . . . . . . . . . . . . . . . . . . . . . . 5
2.1. DNSSEC Key Material . . . . . . . . . . . . . . . . . . . 5
3. EPP Command Mapping . . . . . . . . . . . . . . . . . . . . . 6
3.1. EPP Transient Commands . . . . . . . . . . . . . . . . . 6
3.1.1. EPP <relay> Command . . . . . . . . . . . . . . . . . 6
3.2. EPP Query Commands . . . . . . . . . . . . . . . . . . . 7
3.2.1. EPP <poll> command . . . . . . . . . . . . . . . . . 7
4. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1. Formal Syntax <relay> command and POLL response . . . . . 10
4.2. Formal Syntax <keyRelayData> data . . . . . . . . . . . . 11
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1. Normative References . . . . . . . . . . . . . . . . . . 13
7.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Changelog . . . . . . . . . . . . . . . . . . . . . 13
A.1. draft-gieben-epp-keyrelay-00 . . . . . . . . . . . . . . 13
A.2. draft-gieben-epp-keyrelay-01 . . . . . . . . . . . . . . 13
A.3. draft-gieben-epp-keyrelay-02 . . . . . . . . . . . . . . 14
A.4. draft-gieben-epp-keyrelay-03 . . . . . . . . . . . . . . 14
A.5. draft-ietf-eppext-keyrelay-00 . . . . . . . . . . . . . . 14
A.6. draft-ietf-eppext-keyrelay-01 . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
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1. Introduction
There are certain transactions in the lifecycle of a domain name,
that require interaction between registrars but need registration
data from the registry. Since all registrars involved have a secure
channel to the registry for maintaining the delegation, the registry
can act as relay for such data to transfer securely and authoritative
between the registrars involved.
Currently these transactions aren't supported in the Extensible
Provisioning Protocol (EPP) [RFC5730]. One example of such a
transaction is the exchange of DNSSEC key material to keep the DNSSEC
chain of trust intact in case of a change of DNS-operator.
In this document we will define:
o A protocol extension that implements the relaying of data between
registrars through the existing authenticated EPP channel. This
protocol extension introduces a new EPP command called <relay>
with an element <relayData>.
o An extension to the <relayData> element called <keyRelayData> that
can be used for the relaying DNSSEC key material using the <relay>
command.
1.1. 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 BCP 14, RFC 2119
[RFC2119].
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 examples is provided only to illustrate element
relationships and is not a mandatory feature of this protocol.
1.2. Relaying Data
The <relay> command uses the existing authenticated EPP channel
between the registrar and the registry. Registrars can use this
secure channel for relaying data to other registrars. The registry
serves as an intermediary between two registrars (see Figure 1).
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+-------------+ relayData +-------------+
| registrar X |~~~~~~~~~~~~>| registrar Y |
+-------------+ +-------------+
| ^
| EPP relay EPP poll |
v |
+-----------------------------+
| registry |
+-----------------------------+
Figure 1: Registry acting as a relay for secure data exchange between
registrars.
The <relay> command uploads data from a registrar X to the registry.
The uploaded data is then pushed onto the message queue of registrar
Y by the registry based on the information within the <relayData>
element of the <relay> command and the registration data maintained
by the registry.
The data to be relayed MUST relate to registration data of the
registry. The <relay> command is not intended to relay data that has
no relationship to registration data. We have e-mail for that.
If for some reason the registry cannot process the <relay> command,
an EPP error response MUST be returned. If the registry does process
the <relay> command it MUST put all elements of <relayData> on to the
message queue of registrar Y.
1.2.1. Rationale For a New Command
This new <relay> command can be best described as a "transient
command" as it only facilitates communication of data between two
registrars without changing the registration data at the registry.
No existing EPP command can be (re)used for this function. This
extension of EPP is in accordance to [RFC3735].
1.2.2. Extending <relayData> per use case
One MUST extend the <relayData> element per use case to define the
data to be relayed. In the extension, one MUST make provisions for
the registry how to determine the receiving registrar of the <relay>
command.
1.3. Secure Transfer of DNSSEC Key Material
Exchanging DNSSEC key material in preparation of a domain name
transfer is one of the phases in the lifecycle of a domain name
[I-D.koch-dnsop-dnssec-operator-change].
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DNS-operators need to exchange (through the gaining registrar) DNSSEC
key material before the registration data can be changed.
+--------------------+ DNSKEY +---------------------+
|gaining DNS operator| ~~~~~~~~> | losing DNS operator |
+--------------------+ +---------------------+
| ^
| |
V |
+--------------------+ +---------------------+
| gaining registrar | | registrar of record |
+--------------------+ +---------------------+
| ^
EPP relay | | EPP poll
V |
+-----------------------------+
| registry |
+-----------------------------+
Figure 2: Transfer of DNSSEC key material.
As the <relay> command uses a secure channel, it can be used as a
method for exchanging this DNSSEC key material securely (see
Figure 2).
The gaining and losing DNS operators could talk directly to each
other (the ~ arrow) to exchange the DNSKEY, but often there is no
trusted path between the two. As both can securely interact with the
registry over the administrative channel through the registrar, the
registry can act as a relay for the key material exchange.
This I-D contains an extension of the <relayData> element for this
use case.
2. Object Attributes
2.1. DNSSEC Key Material
To transfer DNSSEC key material with the <relay> command the generic
<relayData> is extended with a <keyRelayData> element that contains
the data for relaying the key material. See Section 1.2.2.
This <keyRelayData> element REQUIRES a minimum of three child
elements:
o A <name> element which contains the domain name for which we
upload the key. The registry MUST relay the <keyRelayData> to the
registrar of record of the provided domain name.
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o One or more <keyData> elements that contains the DNSSEC key
material as described in [RFC5910], Section 4.2.
o An <authInfo> element that contains an authorization token
([RFC5731], Section 3.2.1). This indicates that the registrar has
authorization from the registrant to change the zone data, and a
possible future transfer is authorized. The registry MAY check if
the <authInfo> data is correct and if it does, it MUST return an
EPP error response if the authorization token is not correct.
And an OPTIONAL <expiry> child element.
o An <expiry> element that describes the expected lifetime of the
relayed key(s) in the zone. The losing DNS operator can use this
as an indication when to safely remove the inserted key material
from the zone. This may be because the transaction that needed
the insertion is either completed or has been abandoned if not
completed before this expire time. The <expiry> element MUST
contain one of the following child elements:
* <absolute/>: The policy is valid from the current date and time
until it expires on the specified date and time.
* <relative/>: The policy is valid from the current date and time
until the end of the specified duration.
3. EPP Command Mapping
3.1. EPP Transient Commands
3.1.1. EPP <relay> Command
The EPP <relay> command is a generic EPP command used for relaying
data between registrars. It contains the data to be relayed and the
client transaction identifier. It has been designed to be extensible
for usage in other use-cases.
The <relay> command REQUIRES the following child elements:
o One or more <relayData> elements containing data to be relayed.
o An OPTIONAL <clTRID> (client transaction identifier) element that
MAY be used to uniquely identify the command to the registrar.
See [RFC5730], Section 2.5.
Example <relay> command:
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C:<?xml version="1.0" encoding=:UTF-8" standalone="no"?>
C:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
C: xmlns:secDNS="urn:ietf:params:xml:ns:secDNS-1.1"
C: xmlns:domain="urn:ietf:params:xml:ns:domain-1.0"
C: xmlns:r="urn:ietf:params:xml:ns:relay-1.0">
C: <extension>
C: <r:relay xmlns:r="urn:ietf:params:xml:ns:relay-1.0">
C: <r:relayData>
C: <k:keyRelayData
C: xmlns:k="urn:ietf:params:xml:ns:keyrelay-1.0">
C: <k:name>example.org</k:name>
C: <k:keyData>
C: <secDNS:flags>256</secDNS:flags>
C: <secDNS:protocol>3</secDNS:protocol>
C: <secDNS:alg>8</secDNS:alg>
C: <secDNS:pubKey>
C: cmlraXN0aGViZXN0</secDNS:pubKey>
C: </k:keyData>
C: <k:authInfo>
C: <domain:pw>JnSdBAZSxxzJ</domain:pw>
C: </k:authInfo>
C: <k:expiry>
C: <k:relative>P1M13D</k:relative>
C: </k:expiry>
C: </k:keyRelayData>
C: </r:relayData>
C: <r:clTRID>ABC-12345</r:clTRID>
C: </r:relay>
C: </extension>
C:</epp>
3.2. EPP Query Commands
This EPP extension does not change any command other than the EPP
<poll> command response.
3.2.1. EPP <poll> command
This extension adds elements to the response to a <poll> command with
the "op" attribute set to "req". Specifically, a <panData> element
is added to the <resData> section of the service message, containing
the following elements:
o A REQUIRED <relayData> element that contains the relayed data.
o A REQUIRED <paDate> element that contains the date and time of the
submitted <relay> command.
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o A REQUIRED <reID> element that contains the identifier of the
registrar that requested the data relay.
o A REQUIRED <acID> element that contains the identifier of the
registrar that SHOULD act upon the data relay.
Example <poll> response:
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S:<?xml version="1.0" encoding=:UTF-8" standalone="no"?>
S:<epp xmlns="urn:ietf:params:xml:ns:epp-1.0"
S: xmlns:secDNS="urn:ietf:params:xml:ns:secDNS-1.1"
S: xmlns:domain="urn:ietf:params:xml:ns:domain-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>Relay action completed successfully.</msg>
S: </msgQ>
S: <resData>
S: <r:panData xmlns:r="urn:ietf:params:xml:ns:relay-1.0">
S: <r:relayData>
S: <k:keyRelayData
S: xmlns:k="urn:ietf:params:xml:ns:keyrelay-1.0">
S: <k:name>example.org</k:name>
S: <k:keyData>
S: <secDNS:flags>256</secDNS:flags>
S: <secDNS:protocol>3</secDNS:protocol>
S: <secDNS:alg>8</secDNS:alg>
S: <secDNS:pubKey>
S: cmlraXN0aGViZXN0</secDNS:pubKey>
S: </k:keyData>
S: <k:authInfo>
S: <domain:pw>JnSdBAZSxxzJ</domain:pw>
S: </k:authInfo>
S: <k:expiry>
S: <k:relative>P1M13D</k:relative>
S: </k:expiry>
S: </k:keyRelayData>
S: </r:relayData>
S: <r:paDate>1999-04-04T22:01:00.0Z</r:paDate>
S: <r:reID>ClientX</r:reID>
S: <r:acID>ClientY</r:acID>
S: </r:panData>
S: </resData>
S: <trID>
S: <clTRID>BCD-23456</clTRID>
S: <svTRID>65432-WXY</svTRID>
S: </trID>
S: </response>
S:</epp>
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4. Formal Syntax
4.1. Formal Syntax <relay> command and POLL response
<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="urn:ietf:params:xml:ns:relay-1.0"
xmlns:r="urn:ietf:params:xml:ns:relay-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">
<annotation>
<documentation>
Extensible Provisioning Protocol v1.0 protocol
extension schema for relaying data.
</documentation>
</annotation>
<import namespace="urn:ietf:params:xml:ns:epp-1.0"
schemaLocation="epp-1.0.xsd" />
<import namespace="urn:ietf:params:xml:ns:eppcom-1.0"
schemaLocation="eppcom-1.0.xsd" />
<element name="relay" type="r:relayDataType" />
<element name="panData" type="r:relayPanDataType" />
<complexType name="relayDataType">
<sequence>
<element name="relayData" type="epp:extAnyType" />
<element name="clTRID" type="epp:trIDStringType"
minOccurs="0" />
</sequence>
</complexType>
<complexType name="relayPanDataType">
<sequence>
<element name="relayData" type="epp:extAnyType" />
<element name="paDate" type="dateTime" />
<element name="reID" type="eppcom:clIDType" />
<element name="acID" type="eppcom:clIDType" />
</sequence>
</complexType>
</schema>
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4.2. Formal Syntax <keyRelayData> data
<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="urn:ietf:params:xml:ns:keyrelay-1.0"
xmlns:k="urn:ietf:params:xml:ns:keyrelay-1.0"
xmlns:epp="urn:ietf:params:xml:ns:epp-1.0"
xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0"
xmlns:secDNS="urn:ietf:params:xml:ns:secDNS-1.1"
xmlns:domain="urn:ietf:params:xml:ns:domain-1.0"
xmlns="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
<annotation>
<documentation>
Extensible Provisioning Protocol v1.0 protocol
extension schema for relaying DNSSEC key data.
</documentation>
</annotation>
<import namespace="urn:ietf:params:xml:ns:epp-1.0"
schemaLocation="epp-1.0.xsd" />
<import namespace="urn:ietf:params:xml:ns:eppcom-1.0"
schemaLocation="eppcom-1.0.xsd" />
<import namespace="urn:ietf:params:xml:ns:secDNS-1.1"
schemaLocation="secdns-1.1.xsd" />
<import namespace="urn:ietf:params:xml:ns:domain-1.0"
schemaLocation="domain-1.0.xsd" />
<element name="keyRelayData" type="k:keyRelayDataType" />
<complexType name="keyRelayDataType">
<sequence>
<element name="name" type="eppcom:labelType" />
<element name="keyData" type="secDNS:keyDataType"
minOccurs="1"
maxOccurs="unbounded" />
<element name="authInfo" type="domain:authInfoType" />
<element name="expiry" type="k:keyRelayExpiryType"
minOccurs="0" />
</sequence>
</complexType>
<complexType name="keyRelayExpiryType">
<choice>
<element name="absolute" type="dateTime" />
<element name="relative" type="duration" />
</choice>
</complexType>
</schema>
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5. IANA Considerations
This document uses URNs to describe XML namespaces and XML schemas
conforming to a registry mechanism described in RFC3688 [RFC3688].
Four URI assignments must be completed by the IANA.
Registration request for the extension namespaces:
URI: urn:ietf:params:xml:ns:keyrelay-1.0
URI: urn:ietf:params:xml:ns:relay-1.0
Registrant Contact: IESG
XML: None. Namespace URIs do not represent an XML specification.
Registration request for the extension XML schemas:
URI: urn:ietf:params:xml:schema:keyrelay-1.0
URI: urn:ietf:params:xml:schema:relay-1.0
Registrant Contact: IESG
XML: See the "Formal Syntax" section of this document.
6. Security Considerations
A registry MUST NOT perform any transformation on registration data
under registry management when processing a <relay> command.
Any registrar can use this mechanism to put data on the message queue
of another registrar, allowing for the potential of a denial of
service attack. However this can, and SHOULD be detected by the
registry. A registry MAY set a server policy which limits or rejects
<relay> messages if it detects the mechanism is being abused.
For the <keyRelayData> data a correct <authInfo> element SHOULD be
used as an indication that putting the key material on the
registrar's message queue is authorized by the _registrant_ of that
domain name. This draft does not specify how this <authInfo> is
provided to the registrar. This depends on how the DNS operator is
authorised to perform DNS changes on behalf of the registrant through
the registrar on record. This authorisation is not covered in this
I-D.
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7. References
7.1. Normative References
[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.
[RFC4034] Arends, R., Austein, R., Larson, M., Massey, D., and S.
Rose, "Resource Records for the DNS Security Extensions",
RFC 4034, March 2005.
[RFC5730] Hollenbeck, S., "Extensible Provisioning Protocol (EPP)",
STD 69, RFC 5730, August 2009.
[RFC5731] Hollenbeck, S., "Extensible Provisioning Protocol (EPP)
Domain Name Mapping", STD 69, RFC 5731, August 2009.
[RFC5910] Gould, J. and S. Hollenbeck, "Domain Name System (DNS)
Security Extensions Mapping for the Extensible
Provisioning Protocol (EPP)", RFC 5910, May 2010.
7.2. Informative References
[I-D.koch-dnsop-dnssec-operator-change]
Koch, P., Sanz, M., and A. Verschuren, "Changing DNS
Operators for DNSSEC signed Zones", draft-koch-dnsop-
dnssec-operator-change-06 (work in progress), February
2014.
[RFC3735] Hollenbeck, S., "Guidelines for Extending the Extensible
Provisioning Protocol (EPP)", RFC 3735, March 2004.
Appendix A. Changelog
[This section should be removed by the RFC editor before publishing]
A.1. draft-gieben-epp-keyrelay-00
1. Initial document.
A.2. draft-gieben-epp-keyrelay-01
1. Style and grammar changes;
2. Added an expire element as per suggestion by Klaus Malorny;
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3. Make the authInfo element mandatory and make the registry check
it as per feedback by Klaus Malorny and James Gould.
A.3. draft-gieben-epp-keyrelay-02
1. Added element to identify the relaying EPP client as suggested by
Klaus Malorny;
2. Corrected XML for missing and excess clTRID as noted by Patrick
Mevzek;
3. Added clarifications for the examples based on feedback by
Patrick Mevzeck;
4. Reviewed the consistency of using DNS operator versus registrar
after review comments by Patrick Faltstrom and Ed Lewis.
A.4. draft-gieben-epp-keyrelay-03
1. Style and grammar changes
2. Corrected acknowledgement section
3. Corrected XML for Expire element to not be mandatory but only
occur once.
A.5. draft-ietf-eppext-keyrelay-00
1. Added feedback from Seth Goldman and put him in the
acknowledgement section.
2. IDnits formatting ajustments
A.6. draft-ietf-eppext-keyrelay-01
1. Introducing the <relay> command, and thus seperating the data and
the command.
2. Updated the Introduction, describing the general use of relay vs
the intended use-case of relaying DNSSEC key data.
3. Restructuring the document to make it more inline with exisiting
EPP extensions.
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Authors' Addresses
Miek Gieben
Google
Email: miek@google.com
Marc Groeneweg
SIDN Labs
Meander 501
Arnhem 6825 MD
NL
Email: marc.groeneweg@sidn.nl
URI: https://www.sidn.nl/
Rik Ribbers
SIDN Labs
Meander 501
Arnhem 6825 MD
NL
Email: rik.ribbers@sidn.nl
URI: https://www.sidn.nl/
Antoin Verschuren
Email: ietf@antoin.nl
Gieben, et al. Expires July 12, 2015 [Page 15]