<?xml version='1.0'encoding='utf-8'?>encoding='UTF-8'?> <!-- draft submitted in xml v3 --> <!DOCTYPE rfc [ <!ENTITY nbsp " "> <!ENTITY zwsp "​"> <!ENTITY nbhy "‑"> <!ENTITY wj "⁠"> ]><?xml-stylesheet type="text/xsl" href="rfc2629.xslt" ?> <!-- generated by https://github.com/cabo/kramdown-rfc version 1.7.6 (Ruby 3.0.2) --><rfc xmlns:xi="http://www.w3.org/2001/XInclude" ipr="trust200902"docName="draft-ietf-extra-jmapaccess-08"docName="draft-ietf-extra-jmapaccess-09" number="9698" tocInclude="true" updates="" obsoletes="" category="std" consensus="true" submissionType="IETF" sortRefs="true" xml:lang="en" version="3"><!-- xml2rfc v2v3 conversion 3.20.0 --><front> <title abbrev="IMAP JMAPACCESS">The JMAPACCESS Extension for IMAP</title> <seriesInfoname="Internet-Draft" value="draft-ietf-extra-jmapaccess-08"/>name="RFC" value="9698"/> <author initials="A." surname="Gulbrandsen" fullname="Arnt Gulbrandsen"> <organization>ICANN</organization> <address> <postal> <street>6 Rond Point Schumann, Bd. 1</street> <city>Brussels</city> <code>1040</code> <country>Belgium</country> </postal> <email>arnt@gulbrandsen.priv.no</email> <uri>https://icann.org/ua</uri> </address> </author> <author initials="B." surname="Gondwana" fullname="Bron Gondwana"> <organization>Fastmail</organization> <address> <postal> <street>Level 2, 114 William St.</street> <city>Melbourne VIC</city> <code>3000</code> <country>Australia</country> </postal> <email>brong@fastmailteam.com</email> <uri>https://fastmail.com</uri> </address> </author> <date year="2024"month="March" day="01"/> <area>Applications</area> <workgroup>EXTRA</workgroup>month="December"/> <area>ART</area> <workgroup>extra</workgroup> <keyword>IMAP</keyword> <keyword>JMAP</keyword> <abstract><?line 51?><t>This document defines an IMAP extension to let clients know that the messages in this IMAP server are also available viaJMAP,the JSON Meta Application Protocol (JMAP), and how. It is intended for clients that want to migrate gradually to JMAP or use JMAP extensions within an IMAP client.</t> </abstract> </front> <middle><?line 58?><section anchor="introduction"> <name>Introduction</name> <t>An IMAP server can declare that the messages in its mailstore are also available via JMAP. For simplicity, only a complete equivalence is supported (the same set of messages are available via both IMAP and JMAP).</t><t>This document also defines a way to provide debugging information that can be forwarded to client developers without privacy concerns, which is used by JMAPACCESS but can also be used by others.</t></section> <section anchor="requirements-language"> <name>Requirements Language</name><t>The<t> The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>", "<bcp14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>", "<bcp14>RECOMMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>", "<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are to be interpreted as described inBCP 14BCP 14 <xref target="RFC2119"/> <xref target="RFC8174"/> when, and only when, they appear in all capitals, as shownhere.</t> <?line -18?>here. </t> </section> <section anchor="details"> <name>Details</name> <t>By advertising the JMAPACCESS capability, the server asserts that if a mailbox or message has a particular object ID when accessed via either IMAP or JMAP (see <xref target="RFC3501"/>, <xreftarget="RFC9051"/>target="RFC9051"/>, and <xref target="RFC8620"/>), then the same mailbox or message is accessible via the other protocol, and it has the same ID.</t> <t>The server <bcp14>MUST</bcp14> also advertise the OBJECTID extension, defined by <xref target="RFC8474"/>. The JMAP session resource that allows access to the same messages is called "the JMAP server" below.</t> <t>This specification does not affect message lifetime: If a client accesses a message via IMAP and half a second later via JMAP, then the message may have been deleted between the two accesses.</t> <t>When the server processes the client's LOGIN/AUTHENTICATE command and enters Authenticated state, the server considers the way the client authenticated. If the IMAP server can infer from the client's authentication process that its credentials suffice to authenticate via JMAP, then the server <bcp14>MUST</bcp14>also sendinclude a JMAPACCESSresponse code containing a link tocapability in any capability list sent after that point. This includes theJMAP server.</t>capability list that some servers send immediately when authentication succeeds.</t> <t>Servers are encouraged to report the same message flags and other data via both protocols, as far as possible.</t> <t>This specification does not require mailboxes to have the same name in IMAP and JMAP, even if they share a mailbox ID. However, the JMAP specification regulatesthat,that in the text about the name and role properties described in <xreftarget="RFC8620"/> section 2.</t>target="RFC8620" sectionFormat="of" section="2"/>.</t> <t>Note that all JMAP servers support internationalized email addresses (see <xref target="RFC6530"/>). If this IMAP server doesnot,not or if the IMAP client does not issue ENABLE UTF8=ACCEPT (see <xref target="RFC6855"/>), thenthereit isa possibilitypossible that the clientreceiveswill receive accurate address fields via JMAP and downgraded fields via IMAP (see(see<xref target="RFC6857"/> and <xref target="RFC6858"/> for examples). Issuing ENABLE UTF8=ACCEPT is a simple way to sidestep the issue.</t> </section> <section anchor="the-jmapaccess-response-code"> <name>The GETJMAPACCESS Command and the JMAPACCESSResponse Code</name> <t>TheResponse</name> <t> The GETJMAPACCESS command requests that the server respond with the session URL for the JMAP server that provides access to the same mail.</t> <t> If such a JMAP server is known to this server, the server <bcp14>MUST</bcp14> respond with an untagged JMAPACCESS response containing the JMAP server's session resource (a URL) followed by a tagged OK response.</t> <t> If such a JMAP server is not known, the server <bcp14>MUST</bcp14> respond with a tagged BAD response (and <bcp14>MUST NOT</bcp14> include JMAPACCESS in the capability list).</t> <t> The JMAPACCESS responsecodeis followed by a single link to a JMAP sessionresource. The server/mailstore at that location is referenced as "the JMAP server" in this document.</t>resource.</t> <t>The formal syntax in <xref target="RFC9051"/> is extendedthus:</t> <t>resp-code-jmapaccessas follows:</t> <sourcecode type="abnf"> command-auth =/ "GETJMAPACCESS" mailbox-data =/ resp-jmapaccess resp-jmapaccess = "JMAPACCESS" SPquoted</t> <t>resp-text-code =/ resp-code-jmapaccess</t>quoted </sourcecode> <t>The syntax in <xref target="RFC3501"/> is extended similarly (this extension may be used with IMAP4rev1 as well as IMAP4rev2).</t><t>Note that some clients parse response codes from the outside, ie. scanning for the following ']' before they parse the contents of the response code. Sending a URL that contains either '"' or ']' may be risky.</t></section> <section anchor="Examples"> <name>Examples</name> <t>Lines sent by the client are preceded byC:,C: and lines sent by the server are preceded by S:. Each example starts with the IMAP banner issued by the server on connection, and generally abbreviates the capability lists to what's required by the example itself.</t> <t>Real connections use longer capability lists, much longer AUTHENTICATE arguments and of course use TLS.TheseHowever, these examples focus onJMAPACCESS, though.</t>JMAPACCESS.</t> <t>Example1. A1:</t> <t>A client connects, sees that SASLOAUTHOAuth <xref target="RFC7628"/> is available, and authenticates in that way.</t><t>S:<sourcecode type=""> S: * OK [CAPABILITY IMAP4rev1 AUTH=OAUTHBEARER SASL-IR]example1<br/>example1 C: 1 AUTHENTICATE OAUTHBEARERbixhPXVzZ...QEB</t>bixhPXVzZ...QEB </sourcecode> <t>The server processes the command successfully. It knows that the client usedOauth,OAuth, and that it and its JMAP alter ego use the sameOauthOAuth backend subsystem. Because of that it infers that the (next) access token is just as usable via JMAP as via IMAP. Itissuesincludes a JMAPACCESSresponse codecapability in itsreply:</t> <t>S:reply (again, real capability lists are much longer): </t> <sourcecode type=""> S: 1 OK[JMAPACCESS "https://example.com/jmap"] done</t>[CAPABILITY IMAP4rev1 JMAPACCESS] done C: 1b GETJMAPACCESS S: * JMAPACCESS "https://example.com/.well-known/jmap" S: 1b OK done </sourcecode> <t>SASLOAUTHOAuth is specified by <xref target="RFC7628"/>, and the argument in this example is abbreviated from the more realistic length used inRFC7628.</t>RFC 7628.</t> <t>Example2. A2:</t> <t>A client connects, sees no SASL method itrecognises,recognizes, and issues a LOGIN command.</t><t>S:<sourcecode type=""> S: * OK [CAPABILITY IMAP4rev2]example2<br/>example2 C: 2 LOGIN "arnt""trondheim"</t>"trondheim" </sourcecode> <t>The server sees that the password is accepted, knows that it and its JMAP alter ego use the same password database, and issues a JMAPACCESSresponse code:</t> <t>S:capability:</t> <sourcecode type=""> S: * OK[JMAPACCESS "https://example.com/.s/[jmap]"] For JMAP access[CAPABILITY IMAP4rev2 JMAPACCESS] done S: 2 OKdone</t>done C: 2b JMAPACCESS S: * JMAPACCESS "https://example.com/.well-known/jmap" S: 2b OK done </sourcecode> <t>The URL uses the same quoting rules as most other IMAPstrings, and "]" is permitted in quoted strings. Permitted but in this case not encouraged, since some clients are known to scan for the "]" before parsing the string inside "[]". Luckily, few URLs contain "]".</t>strings.</t> <t>Example3. A3:</t> <t>A client connects, sees no SASL method itrecognises,recognizes, and issues a LOGIN command with a correct password.</t><t>S:<sourcecode type=""> S: * OK [CAPABILITY IMAP4rev1 IMAP4rev2]example3<br/>example3 C: 3 LOGIN "arnt""trondheim"</t>"trondheim" </sourcecode> <t>The server operator has decided to disable password use with JMAP, but allow it for a while with IMAP to cater to olderclients, soclients. Therefore, the login succeeds, but there is no JMAPACCESSresponse code.</t> <t>S:capability.</t> <sourcecode type=""> S: 3 OKdone</t>done </sourcecode> <t>Example4. A4:</t> <t>A client connects, sees no SASL method itrecognises,recognizes, and issues a LOGIN command. Its password is incorrect.</t><t>S:<sourcecode type=""> S: * OK [CAPABILITY IMAP4rev2 AUTH=GSS]example4<br/>example4 C: 4 LOGIN "arnt""oslo"</t>"oslo" </sourcecode> <t>The server does not enter Authenticated state, so nothing requires it toissuemention JMAPACCESS. It replies curtly:</t><t>S:<sourcecode type=""> S: 4 NOdone</t>done </sourcecode> </section> <section anchor="IANA"> <name>IANA Considerations</name> <t>The IANAis requested to addhas added the JMAPACCESSresponse codecapability to theIMAP Response Codes registry, with"Internet Message Access Protocol (IMAP) Capabilities Registry" and listed this document as the reference.</t> </section> <section anchor="Security"> <name>Security Considerations</name><t>The JMAPACCESS response code<t>JMAPACCESS reveals to authenticated IMAP clients that they would be able to authenticate via JMAP using the samecredentials,credentials and that the object IDs match.</t> <t>One does not normallywishreveal anything at all about authentication. However,in this case informationif the client isrevealed toanauthenticated client,attacker, then therevealed URL can usually be found via JMAP autodiscovery,attacker is known to have valid credentials, andan<xref target="RFC8620" sectionFormat="of" section="2.2"/> tells the attackerwould only needhow totryfind thecredentials used once anyway (a matterrevealed URL without the help ofa second or two).this extension. Therefore, it is believed that this document does not benefit an attacker noticeably, and its value for migration far outweighs its risk.</t> </section> </middle> <back> <references> <name>References</name> <references anchor="sec-normative-references"> <name>Normative References</name><reference anchor="RFC3501"> <front> <title>INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1</title> <author fullname="M. Crispin" initials="M." surname="Crispin"/> <date month="March" year="2003"/> <abstract> <t>The Internet Message Access Protocol, Version 4rev1 (IMAP4rev1) allows a client to access and manipulate electronic mail messages on a server. IMAP4rev1 permits manipulation of mailboxes (remote message folders) in a way that is functionally equivalent to local folders. IMAP4rev1 also provides the capability for an offline client to resynchronize with the server. IMAP4rev1 includes operations for creating, deleting, and renaming mailboxes, checking for new messages, permanently removing messages, setting and clearing flags, RFC 2822 and RFC 2045 parsing, searching, and selective fetching of message attributes, texts, and portions thereof. Messages in IMAP4rev1 are accessed by the use of numbers. These numbers are either message sequence numbers or unique identifiers. IMAP4rev1 supports a single server. A mechanism for accessing configuration information to support multiple IMAP4rev1 servers is discussed in RFC 2244. IMAP4rev1 does not specify a means of posting mail; this function is handled by a mail transfer protocol such as RFC 2821. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="3501"/> <seriesInfo name="DOI" value="10.17487/RFC3501"/> </reference> <reference anchor="RFC8474"> <front> <title>IMAP Extension for Object Identifiers</title> <author fullname="B. Gondwana" initials="B." role="editor" surname="Gondwana"/> <date month="September" year="2018"/> <abstract> <t>This document updates RFC 3501 (IMAP4rev1) with persistent identifiers on mailboxes and messages to allow clients to more efficiently reuse cached data when resources have changed location on the server.</t> </abstract> </front> <seriesInfo name="RFC" value="8474"/> <seriesInfo name="DOI" value="10.17487/RFC8474"/> </reference> <reference anchor="RFC9051"> <front> <title>Internet Message Access Protocol (IMAP) - Version 4rev2</title> <author fullname="A. Melnikov" initials="A." role="editor" surname="Melnikov"/> <author fullname="B. Leiba" initials="B." role="editor" surname="Leiba"/> <date month="August" year="2021"/> <abstract> <t>The Internet Message Access Protocol Version 4rev2 (IMAP4rev2) allows a client to access and manipulate electronic mail messages on a server. IMAP4rev2 permits manipulation of mailboxes (remote message folders) in a way that is functionally equivalent to local folders. IMAP4rev2 also provides the capability for an offline client to resynchronize with the server.</t> <t>IMAP4rev2 includes operations for creating, deleting, and renaming mailboxes; checking for new messages; removing messages permanently; setting and clearing flags; parsing per RFCs 5322, 2045, and 2231; searching; and selective fetching of message attributes, texts, and portions thereof. Messages in IMAP4rev2 are accessed by the use of numbers. These numbers are either message sequence numbers or unique identifiers.</t> <t>IMAP4rev2 does not specify a means of posting mail; this function is handled by a mail submission protocol such as the one specified in RFC 6409.</t> </abstract> </front> <seriesInfo name="RFC" value="9051"/> <seriesInfo name="DOI" value="10.17487/RFC9051"/> </reference> <reference anchor="RFC2119"> <front> <title>Key words for use in RFCs to Indicate Requirement Levels</title> <author fullname="S. Bradner" initials="S." surname="Bradner"/> <date month="March" year="1997"/> <abstract> <t>In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.</t> </abstract> </front> <seriesInfo name="BCP" value="14"/> <seriesInfo name="RFC" value="2119"/> <seriesInfo name="DOI" value="10.17487/RFC2119"/> </reference> <reference anchor="RFC8174"> <front> <title>Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words</title> <author fullname="B. Leiba" initials="B." surname="Leiba"/> <date month="May" year="2017"/> <abstract> <t>RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.</t> </abstract> </front> <seriesInfo name="BCP" value="14"/> <seriesInfo name="RFC" value="8174"/> <seriesInfo name="DOI" value="10.17487/RFC8174"/> </reference><xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3501.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8474.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9051.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"/> </references> <references anchor="sec-informative-references"> <name>Informative References</name><reference anchor="RFC6530"> <front> <title>Overview and Framework for Internationalized Email</title> <author fullname="J. Klensin" initials="J." surname="Klensin"/> <author fullname="Y. Ko" initials="Y." surname="Ko"/> <date month="February" year="2012"/> <abstract> <t>Full use of electronic mail throughout the world requires that (subject to other constraints) people be able to use close variations on their own names (written correctly in their own languages and scripts) as mailbox names in email addresses. This document introduces a series of specifications that define mechanisms and protocol extensions needed to fully support internationalized email addresses. These changes include an SMTP extension and extension of email header syntax to accommodate UTF-8 data. The document set also includes discussion of key assumptions and issues in deploying fully internationalized email. This document is a replacement for RFC 4952; it reflects additional issues identified since that document was published. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="6530"/> <seriesInfo name="DOI" value="10.17487/RFC6530"/> </reference> <reference anchor="RFC6855"> <front> <title>IMAP Support for UTF-8</title> <author fullname="P. Resnick" initials="P." role="editor" surname="Resnick"/> <author fullname="C. Newman" initials="C." role="editor" surname="Newman"/> <author fullname="S. Shen" initials="S." role="editor" surname="Shen"/> <date month="March" year="2013"/> <abstract> <t>This specification extends the Internet Message Access Protocol (IMAP) to support UTF-8 encoded international characters in user names, mail addresses, and message headers. This specification replaces RFC 5738.</t> </abstract> </front> <seriesInfo name="RFC" value="6855"/> <seriesInfo name="DOI" value="10.17487/RFC6855"/> </reference> <reference anchor="RFC6857"> <front> <title>Post-Delivery Message Downgrading for Internationalized Email Messages</title> <author fullname="K. Fujiwara" initials="K." surname="Fujiwara"/> <date month="March" year="2013"/> <abstract> <t>The Email Address Internationalization (SMTPUTF8) extension to SMTP allows Unicode characters encoded in UTF-8 and outside the ASCII repertoire in mail header fields. Upgraded POP and IMAP servers support internationalized messages. If a POP or IMAP client does not support Email Address Internationalization, a POP or IMAP server cannot deliver internationalized messages to the client and cannot remove the message. To avoid that situation, this document describes a mechanism for converting internationalized messages into the traditional message format. As part of the conversion process, message elements that require internationalized treatment are recoded or removed, and receivers are able to recognize that they received messages containing such elements, even if they cannot process the internationalized elements.</t> </abstract> </front> <seriesInfo name="RFC" value="6857"/> <seriesInfo name="DOI" value="10.17487/RFC6857"/> </reference> <reference anchor="RFC6858"> <front> <title>Simplified POP and IMAP Downgrading for Internationalized Email</title> <author fullname="A. Gulbrandsen" initials="A." surname="Gulbrandsen"/> <date month="March" year="2013"/> <abstract> <t>This document specifies a method for IMAP and POP servers to serve internationalized messages to conventional clients. The specification is simple, easy to implement, and provides only rudimentary results.</t> </abstract> </front> <seriesInfo name="RFC" value="6858"/> <seriesInfo name="DOI" value="10.17487/RFC6858"/> </reference> <reference anchor="RFC7628"> <front> <title>A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth</title> <author fullname="W. Mills" initials="W." surname="Mills"/> <author fullname="T. Showalter" initials="T." surname="Showalter"/> <author fullname="H. Tschofenig" initials="H." surname="Tschofenig"/> <date month="August" year="2015"/> <abstract> <t>OAuth enables a third-party application to obtain limited access to a protected resource, either on behalf of a resource owner by orchestrating an approval interaction or by allowing the third-party application to obtain access on its own behalf.</t> <t>This document defines how an application client uses credentials obtained via OAuth over the Simple Authentication and Security Layer (SASL) to access a protected resource at a resource server. Thereby, it enables schemes defined within the OAuth framework for non-HTTP-based application protocols.</t> <t>Clients typically store the user's long-term credential. This does, however, lead to significant security vulnerabilities, for example, when such a credential leaks. A significant benefit of OAuth for usage in those clients is that the password is replaced by a shared secret with higher entropy, i.e., the token. Tokens typically provide limited access rights and can be managed and revoked separately from the user's long-term password.</t> </abstract> </front> <seriesInfo name="RFC" value="7628"/> <seriesInfo name="DOI" value="10.17487/RFC7628"/> </reference> <reference anchor="RFC8620"> <front> <title>The JSON Meta Application Protocol (JMAP)</title> <author fullname="N. Jenkins" initials="N." surname="Jenkins"/> <author fullname="C. Newman" initials="C." surname="Newman"/> <date month="July" year="2019"/> <abstract> <t>This document specifies a protocol for clients to efficiently query, fetch, and modify JSON-based data objects, with support for push notification of changes and fast resynchronisation and for out-of- band binary data upload/download.</t> </abstract> </front> <seriesInfo name="RFC" value="8620"/> <seriesInfo name="DOI" value="10.17487/RFC8620"/> </reference><xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6530.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6855.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6857.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6858.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7628.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8620.xml"/> </references> </references> </back><!-- 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