RFC 9167 | EPP Registry Maintenance | December 2021 |
Sattler, et al. | Standards Track | [Page] |
This document describes an Extensible Provisioning Protocol (EPP) extension called "Registry Maintenance Notification", which is used by EPP servers to notify EPP clients and allow EPP clients to query EPP servers regarding maintenance events.¶
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/rfc9167.¶
Copyright (c) 2021 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
The Extensible Provisioning Protocol (EPP), as defined in [RFC5730], is a protocol whose original motivation is to provide a standard Internet domain name registration protocol for use between registries and registrars.¶
Registries routinely update systems to ensure a higher quality of service, implement new services, or upgrade protocols to the latest standards. These updates are pushed to various registry environments during time frames communicated to registrars as "maintenance events". Maintenance events may require making services unavailable for some limited time while the upgrade happens. Registries usually inform registrars about maintenance events in various formats, none of which are standardized between registries.¶
The DNS namespace expansion has led to many additional registries that registrars must interact with, adding more maintenance events and formats. It is now desirable to provide an efficient approach to notify registrars.¶
This document describes an extension mapping for version 1.0 of the EPP to provide a mechanism by which EPP servers may notify EPP clients of and allow EPP clients to query EPP servers on upcoming maintenance events.¶
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 [W3C.REC-xml-20081126] 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.¶
The XML namespace prefix "maint" is used for the namespace "urn:ietf:params:xml:ns:epp:maintenance-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.¶
"ote" is an abbreviation for "Operational Test and Evaluation".¶
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.¶
Servers that implement this extension SHOULD provide a way for clients to progressively update their implementations when a new version of the extension is deployed. A newer version of the extension is expected to use an XML namespace with a higher version number than the prior versions.¶
Servers SHOULD (for a temporary migration period up to server policy) provide support for older versions of the extension in parallel to the newest version and allow clients to execute their preferred version of the <info> command based on the maintenance <objURI> elements of the server <greeting>. The version of the maintenance <info> response MUST match the version of the maintenance <info> command executed by the server.¶
Servers MUST return a Registry Maintenance Notification poll message matching the newest negotiated version of the maintenance extension, based on an intersection of the maintenance <objURI> elements in the server <greeting> and the client <login> command. If the intersection of the maintenance <objURI> elements of the server <greeting> and the client <login> command results in an empty set, the server MUST return the newest version of the Registry Maintenance Notification poll message supported by the server based on "Usage with Poll-Message EPP Responses" in Section 6 of [RFC9038].¶
Names of affected hosts MUST be provided in A-label form, according to [RFC5891].¶
All date and time attribute values MUST be expressed in Universal Coordinated Time (UTC) using the Gregorian calendar. The date-time format defined as "date-time" in [RFC3339], with time-offset="Z", MUST be used.¶
The <maint:item> element describes a single registry maintenance event during a specific period. This element is used in a maintenance item EPP <info> command and response as well as in a <poll> response.¶
If an element is not marked as optional, it is mandatory.¶
One or more <maint:system> elements that are affected by the maintenance event.¶
The <maint:system> element contains the following child elements:¶
The OPTIONAL <maint:tlds> element contains one or more <maint:tld> child elements. If the <maint:tlds> is not present, the entire system is affected.¶
The OPTIONAL <maint:intervention> element contains the following child elements:¶
A detailed description of the EPP syntax and semantics can be found in the EPP core protocol specification [RFC5730]. The command mappings described here are specifically used to notify registrars of registry maintenance events and object mapping.¶
EPP [RFC5730] provides three commands to retrieve object information: <check> to determine if an object is known to the server, <info> to retrieve detailed information associated with an object, and <transfer> to retrieve object transfer status information.¶
This extension does not add any elements to EPP <check> and <transfer> commands or responses.¶
EPP provides the <info> command that is used to retrieve registry maintenance information. In addition to the standard EPP command elements, the <info> command MUST contain a <maint:info> element that identifies the maintenance namespace.¶
The <maint:info> element MUST contain a child element. It is either the <maint:id> child element, described in Section 4.1.1.1, to query for a specific maintenance item or the <maint:list> child element, described in Section 4.1.1.2, to query all maintenance items.¶
The information regarding a specific maintenance item can be retrieved by using the <info> command with the <maint:info> element and the <maint:id> child element, defined in Section 3.3. If the maintenance identifier does not exist, the server MUST return an EPP error result code of 2303 ("Object does not exist") [RFC5730].¶
The following is an example of retrieving a specific maintenance item in an <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: <maint:info C: xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0"> C: <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6</maint:id> C: </maint: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 <maint:infData> element that identifies the maintenance namespace. The <maint:infData> element contains the <maint:item> element defined in Section 3.3.¶
The following is an example of returning a specific maintenance item in an <info> response.¶
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>Command completed successfully</msg> S: </result> S: <resData> S: <maint:infData S: xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0"> S: <maint:item> S: <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6 S: </maint:id> S: <maint:type lang="en">Routine Maintenance</maint:type> S: <maint:systems> S: <maint:system> S: <maint:name>EPP</maint:name> S: <maint:host>epp.registry.example S: </maint:host> S: <maint:impact>full</maint:impact> S: </maint:system> S: </maint:systems> S: <maint:environment type="production"/> S: <maint:start>2021-12-30T06:00:00Z</maint:start> S: <maint:end>2021-12-30T07:00:00Z</maint:end> S: <maint:reason>planned</maint:reason> S: <maint:detail> S: https://www.registry.example/notice?123 S: </maint:detail> S: <maint:description lang="en">free-text S: </maint:description> S: <maint:description lang="de">Freitext S: </maint:description> S: <maint:tlds> S: <maint:tld>example</maint:tld> S: <maint:tld>test</maint:tld> S: </maint:tlds> S: <maint:intervention> S: <maint:connection>false</maint:connection> S: <maint:implementation>false</maint:implementation> S: </maint:intervention> S: <maint:crDate>2021-11-08T22:10:00Z</maint:crDate> S: </maint:item> S: </maint:infData> S: </resData> S: <trID> S: <clTRID>ABC-12345</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp>¶
The information for a list of maintenance items can be retrieved by using the <info> command with the <maint:info> element and the empty <maint:list> child element. Server policy determines if completed maintenance events will be included in the list of maintenance items.¶
The following is an example of retrieving the list of maintenance items in an <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: <maint:info C: xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0"> C: <maint:list/> C: </maint: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 <maint:infData> element that identifies the maintenance namespace. The <maint:infData> element contains the <maint:list> element with zero or more <maint:listItem> child elements. The <maint:listItem> element contains the following child elements:¶
The following is an example of returning the list of maintenance items in an <info> response.¶
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>Command completed successfully</msg> S: </result> S: <resData> S: <maint:infData S: xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0"> S: <maint:list> S: <maint:listItem> S: <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6 S: </maint:id> S: <maint:start>2021-12-30T06:00:00Z</maint:start> S: <maint:end>2021-12-30T07:00:00Z</maint:end> S: <maint:crDate>2021-11-08T22:10:00Z</maint:crDate> S: </maint:listItem> S: <maint:listItem> S: <maint:id>91e9dabf-c4e9-4c19-a56c-78e3e89c2e2f S: </maint:id> S: <maint:start>2021-12-15T04:30:00Z</maint:start> S: <maint:end>2021-12-15T05:30:00Z</maint:end> S: <maint:crDate>2021-11-08T22:11:00Z</maint:crDate> S: <maint:upDate>2021-11-17T15:00:00Z</maint:upDate> S: </maint:listItem> S: </maint:list> S: </maint:infData> S: </resData> S: <trID> S: <clTRID>ABC-12345</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp>¶
The EPP <poll> command and response are defined in Section 2.9.2.3 of [RFC5730]. The Registry Maintenance Notification is included in the EPP <poll> response in [RFC5730].¶
There are five types of poll messages for the Registry Maintenance Notification, defined by the <maint:pollType> element in Section 3.3. A poll message might be generated when a maintenance event is created, updated, or deleted. A courtesy poll message can be sent as a reminder of an upcoming maintenance event. An end poll message can be sent when the maintenance event is completed. In the case of a message specific to Registry Maintenance, a <maint:infData> element that identifies the maintenance namespace will be included within the <resData> element of the standard <poll> response. The <maint:infData> element contains the <maint:item> element defined in Section 3.3.¶
The following is an example of a <poll> 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: <poll op="req"/> C: <clTRID>ABC-12345</clTRID> C: </command> C:</epp>¶
Example <poll> 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="1301"> S: <msg>Command completed successfully; ack to dequeue</msg> S: </result> S: <msgQ count="1" id="12345"> S: <qDate>2021-11-08T22:10:00Z</qDate> S: <msg lang="en">Registry Maintenance Notification</msg> S: </msgQ> S: <resData> S: <maint:infData S: xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0"> S: <maint:item> S: <maint:id>2e6df9b0-4092-4491-bcc8-9fb2166dcee6</maint:id> S: <maint:pollType>create</maint:pollType> S: <maint:systems> S: <maint:system> S: <maint:name>EPP</maint:name> S: <maint:host>epp.registry.example S: </maint:host> S: <maint:impact>full</maint:impact> S: </maint:system> S: </maint:systems> S: <maint:environment type="production"/> S: <maint:start>2021-12-30T06:00:00Z</maint:start> S: <maint:end>2021-12-30T07:00:00Z</maint:end> S: <maint:reason>planned</maint:reason> S: <maint:detail> S: https://www.registry.example/notice?123 S: </maint:detail> S: <maint:tlds> S: <maint:tld>example</maint:tld> S: <maint:tld>test</maint:tld> S: </maint:tlds> S: <maint:intervention> S: <maint:connection>false</maint:connection> S: <maint:implementation>false</maint:implementation> S: </maint:intervention> S: <maint:crDate>2021-11-08T22:10:00Z</maint:crDate> S: </maint:item> S: </maint:infData> S: </resData> S: <trID> S: <clTRID>ABC-12345</clTRID> S: <svTRID>54321-XYZ</svTRID> S: </trID> S: </response> S:</epp>¶
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.¶
This extension does not add any elements to the EPP <create>, <delete>, <renew>, <transfer>, and <update> commands.¶
The EPP Registry Maintenance Notification schema is presented here.¶
The formal syntax is a complete schema representation of the object mapping suitable for automated validation of EPP XML instances. The <CODE BEGINS> and <CODE ENDS> tags are not part of the schema; they are used to note the beginning and end of the schema for URI registration purposes.¶
<CODE BEGINS> <?xml version="1.0" encoding="UTF-8"?> <schema targetNamespace="urn:ietf:params:xml:ns:epp: maintenance-1.0" xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0" xmlns:epp="urn:ietf:params:xml:ns:epp-1.0" xmlns:maint="urn:ietf:params:xml:ns:epp:maintenance-1.0" xmlns="https://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 Registry Maintenance Notification Mapping Schema. </documentation> </annotation> <!-- Child elements found in EPP commands. --> <element name="info" type="maint:infoType"/> <!-- Child elements of the <info> command. --> <complexType name="infoType"> <sequence> <choice> <element name="list"/> <element name="id" type="maint:idType"/> </choice> </sequence> </complexType> <!-- Human-readable text may describe the maintenance --> <complexType name="idType"> <simpleContent> <extension base="token"> <attribute name="name" type="token"/> <attribute name="lang" type="language" default="en"/> </extension> </simpleContent> </complexType> <!-- Info Response element --> <element name="infData" type="maint:infDataType"/> <!-- <info> response elements. --> <complexType name="infDataType"> <choice> <element name="list" type="maint:listDataType"/> <element name="item" type="maint:maintDataType"/> </choice> </complexType> <!-- Attributes associated with the list info response --> <complexType name="listDataType"> <sequence> <element name="listItem" type="maint:maintItemType" minOccurs="0" maxOccurs="unbounded"/> </sequence> </complexType> <!-- Attributes associated with the list item info response --> <complexType name="maintItemType"> <sequence> <element name="id" type="maint:idType"/> <element name="start" type="dateTime"/> <element name="end" type="dateTime"/> <element name="crDate" type="dateTime"/> <element name="upDate" type="dateTime" minOccurs="0"/> </sequence> </complexType> <!-- Attributes associated with the maintenance info response --> <complexType name="maintDataType"> <sequence> <element name="id" type="maint:idType"/> <element name="type" type="maint:typeType" minOccurs="0" maxOccurs="unbounded"/> <element name="pollType" type="maint:pollType" minOccurs="0"/> <element name="systems" type="maint:systemsType"/> <element name="environment" type="maint:envType"/> <element name="start" type="dateTime"/> <element name="end" type="dateTime"/> <element name="reason" type="maint:reasonEnum"/> <element name="detail" type="anyURI" minOccurs="0"/> <element name="description" type="maint:descriptionType" minOccurs="0" maxOccurs="unbounded"/> <element name="tlds" type="maint:tldsType" minOccurs="0"/> <element name="intervention" type="maint:interventionType" minOccurs="0"/> <element name="crDate" type="dateTime"/> <element name="upDate" type="dateTime" minOccurs="0"/> </sequence> </complexType> <!-- systems element --> <complexType name="systemsType"> <sequence> <element name="system" type="maint:systemType" maxOccurs="unbounded"/> </sequence> </complexType> <!-- Enumerated list of poll types --> <simpleType name="pollType"> <restriction base="token"> <enumeration value="create"/> <enumeration value="update"/> <enumeration value="delete"/> <enumeration value="courtesy"/> <enumeration value="end"/> </restriction> </simpleType> <!-- Enumerated list of impacts --> <simpleType name="impactEnum"> <restriction base="token"> <enumeration value="none"/> <enumeration value="partial"/> <enumeration value="full"/> </restriction> </simpleType> <!-- description element --> <complexType name="descriptionType"> <simpleContent> <extension base="string"> <attribute name="lang" type="language" default="en"/> <attribute name="type" type="maint:descEnum" default="plain" /> </extension> </simpleContent> </complexType> <!-- Enumerated list of description mime types --> <simpleType name="descEnum"> <restriction base="token"> <enumeration value="plain"/> <enumeration value="html"/> </restriction> </simpleType> <!-- type element --> <complexType name="typeType"> <simpleContent> <extension base="string"> <attribute name="lang" type="language" default="en"/> </extension> </simpleContent> </complexType> <!-- system element --> <complexType name="systemType"> <sequence> <element name="name" type="token"/> <element name="host" type="eppcom:labelType" minOccurs="0"/> <element name="impact" type="maint:impactEnum"/> </sequence> </complexType> <!-- Enumerated list of environments --> <simpleType name="envEnum"> <restriction base="token"> <enumeration value="production"/> <enumeration value="ote"/> <enumeration value="staging"/> <enumeration value="dev"/> <enumeration value="custom"/> </restriction> </simpleType> <!-- environment element --> <complexType name="envType"> <simpleContent> <extension base="token"> <attribute name="type" type="maint:envEnum" use="required"/> <attribute name="name" type="token" use="optional"/> </extension> </simpleContent> </complexType> <!-- Enumerated list of reasons --> <simpleType name="reasonEnum"> <restriction base="token"> <enumeration value="planned"/> <enumeration value="emergency"/> </restriction> </simpleType> <!-- tlds element --> <complexType name="tldsType"> <sequence> <element name="tld" type="eppcom:labelType" maxOccurs="unbounded"/> </sequence> </complexType> <!-- intervention element --> <complexType name="interventionType"> <sequence> <element name="connection" type="boolean"/> <element name="implementation" type="boolean"/> </sequence> </complexType> <!-- End of schema. --> </schema> <CODE ENDS>¶
This document uses URNs to describe XML namespaces and XML schemas conforming to a registry mechanism defined in [RFC3688].¶
The following entry has been registered as an XML namespace:¶
The following entry has been registered to the XML maintenance schema:¶
The following entry has been added to the "Extensions for the Extensible Provisioning Protocol (EPP)" registry, described in [RFC7451]:¶
The security considerations of [RFC5730] apply in this document. Additionally, a server MUST only provide maintenance information to clients that are authorized. Suppose a client queries a maintenance identifier that it is not authorized to access per Section 4.1.1.1, "Info Maintenance Item". In that case, the server SHOULD return an EPP error result code of 2201 ("Authorization error") or 2303 ("Object does not exist") [RFC5730]. The list of top-level domains or registry zones returned in the "Info Maintenance Item" response SHOULD be filtered based on the top-level domains or registry zones for which the client is authorized. Authorization of poll messages is done at the time of poll message insertion and not at the time of poll message consumption.¶
The authors wish to thank the following persons for their feedback and suggestions: James Gould, Michael Bauland, Patrick Mevzek, Quoc-Anh Pham, Raymond Zylstra, Christopher Martens, Anthony Eden, Neal McPherson, Craig Marchant, and Andreas Huber.¶