IMAP4 Extension for Returning MYRIGHTS Information in Extended LIST
RFC 8440
Internet Engineering Task Force (IETF) K. Murchison
Request for Comments: 8440 B. Gondwana
Category: Standards Track FastMail
ISSN: 2070-1721 August 2018
IMAP4 Extension for Returning MYRIGHTS Information in Extended LIST
Abstract
This document defines an extension to the Internet Message Access
Protocol (IMAP) LIST command that allows the client to request the
set of rights that the logged-in user has been granted on mailboxes,
along with other information typically returned by the LIST command.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8440.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
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RFC 8440 IMAP LIST-MYRIGHTS August 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 2
3. MYRIGHTS Return Option to LIST Command . . . . . . . . . . . 2
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . 4
7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 4
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
8.1. Registration of IMAP Capability LIST-MYRIGHTS . . . . . . 4
8.2. Registration of LIST-EXTENDED Option MYRIGHTS . . . . . . 4
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1. Normative References . . . . . . . . . . . . . . . . . . 5
9.2. Informative References . . . . . . . . . . . . . . . . . 6
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
IMAP [RFC3501] clients typically fetch the set of rights granted on
mailboxes so they can expose the allowed functionality to the logged-
in user. In order to do that, the client is forced to issue a LIST
or LSUB command to list all available mailboxes, followed by a
MYRIGHTS command for each mailbox found. This document defines an
extension to the to IMAP LIST command that is identified by the
capability string "LIST-MYRIGHTS". The LIST-MYRIGHTS extension
allows the client to request the set of rights that the logged-in
user has been granted on mailboxes, along with other information
typically returned by the LIST command.
2. Conventions Used in This Document
In examples, "C:" indicates lines sent by a client that is connected
to a server. "S:" indicates lines sent by the server to the client.
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.
3. MYRIGHTS Return Option to LIST Command
[RFC4314] defines the MYRIGHTS command, which is used by an IMAP
client to determine the set of rights that the logged-in user has
been granted on a given mailbox. Frequently, a client will have to
look up the rights for some or all of the mailboxes returned by the
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RFC 8440 IMAP LIST-MYRIGHTS August 2018
LIST command. Doing so in multiple MYRIGHTS commands wastes
bandwidth and can degrade performance if the client does not pipeline
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