< draft-ietf-extra-sieve-mailboxid-01.txt   draft-ietf-extra-sieve-mailboxid-02.txt >
EXTRA B. Gondwana, Ed. EXTRA B. Gondwana, Ed.
Internet-Draft Fastmail Internet-Draft Fastmail
Updates: 5228 (if approved) 30 July 2020 Updates: 5228 (if approved) September 3, 2020
Intended status: Standards Track Intended status: Standards Track
Expires: 31 January 2021 Expires: March 7, 2021
Sieve Email Filtering: delivery by mailboxid Sieve Email Filtering: delivery by mailboxid
draft-ietf-extra-sieve-mailboxid-01 draft-ietf-extra-sieve-mailboxid-02
Abstract Abstract
The OBJECTID capability of the IMAP protocol (RFC8474) allows clients The OBJECTID capability of the IMAP protocol (RFC8474) allows clients
to identify mailboxes by a unique identifier which survives rename. to identify mailboxes by a unique identifier which survives rename.
This document extends the Sieve mail filtering language (RFC5228) to This document extends the Sieve mail filtering language (RFC5228) to
allow using that same unique identifier as a target for fileinto allow using that same unique identifier as a target for fileinto
rules, and for testing the existance of mailboxes. rules, and for testing the existance of mailboxes.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on 31 January 2021. This Internet-Draft will expire on March 7, 2021.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/ Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document. license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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provided without warranty as described in the Simplified BSD License. provided without warranty as described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used In This Document . . . . . . . . . . . . . . 3 2. Conventions Used In This Document . . . . . . . . . . . . . . 3
3. Sieve capability string . . . . . . . . . . . . . . . . . . . 3 3. Sieve capability string . . . . . . . . . . . . . . . . . . . 3
4. Argument ":mailboxid" to Command "fileinto" . . . . . . . . . 3 4. Argument ":mailboxid" to Command "fileinto" . . . . . . . . . 3
4.1. Interaction with "mailbox" extension . . . . . . . . . . 4 4.1. Interaction with "mailbox" extension . . . . . . . . . . 4
4.2. Interaction with "specialuse" extension . . . . . . . . . 4 4.2. Interaction with "specialuse" extension . . . . . . . . . 4
4.3. Interaction with "fcc" extension . . . . . . . . . . . . 5 5. Interaction with "fcc" extension . . . . . . . . . . . . . . 5
5. Test ":mailboxidexists" . . . . . . . . . . . . . . . . . . . 5 6. Test "mailboxidexists" . . . . . . . . . . . . . . . . . . . 5
6. Interaction with variables extension . . . . . . . . . . . . 6 7. Interaction with variables extension . . . . . . . . . . . . 6
7. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 6 8. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 6
8. Security considerations . . . . . . . . . . . . . . . . . . . 6 9. Security considerations . . . . . . . . . . . . . . . . . . . 6
9. IANA considerations . . . . . . . . . . . . . . . . . . . . . 7 10. IANA considerations . . . . . . . . . . . . . . . . . . . . . 7
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
11. Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 12. Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
11.1. draft-ietf-sieve-mailboxid-01 . . . . . . . . . . . . . 7 12.1. draft-ietf-sieve-mailboxid-02 . . . . . . . . . . . . . 7
11.2. draft-ietf-sieve-mailboxid-00 . . . . . . . . . . . . . 7 12.2. draft-ietf-sieve-mailboxid-01 . . . . . . . . . . . . . 7
11.3. draft-gondwana-sieve-mailboxid-02 . . . . . . . . . . . 8 12.3. draft-ietf-sieve-mailboxid-00 . . . . . . . . . . . . . 7
11.4. draft-gondwana-sieve-mailboxid-01 . . . . . . . . . . . 8 12.4. draft-gondwana-sieve-mailboxid-02 . . . . . . . . . . . 8
11.5. draft-gondwana-sieve-mailboxid-00 . . . . . . . . . . . 8 12.5. draft-gondwana-sieve-mailboxid-01 . . . . . . . . . . . 8
12. Normative References . . . . . . . . . . . . . . . . . . . . 8 12.6. draft-gondwana-sieve-mailboxid-00 . . . . . . . . . . . 8
13. Informative References . . . . . . . . . . . . . . . . . . . 9 13. Normative References . . . . . . . . . . . . . . . . . . . . 8
14. Informative References . . . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction 1. Introduction
[RFC5228] Sieve rules are sometimes created using graphical [RFC5228] Sieve rules are sometimes created using graphical
interfaces which allow users to select the mailbox to be used as a interfaces which allow users to select the mailbox to be used as a
target for a rule. target for a rule.
If that mailbox is renamed, the client may also update its internal If that mailbox is renamed, the client may also update its internal
representation of the rule and update the sieve script to match, representation of the rule and update the sieve script to match,
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require "mailbox"; require "mailbox";
require "special-use"; require "special-use";
fileinto :mailboxid "F1234567" fileinto :mailboxid "F1234567"
:specialuse "\\Archive" :specialuse "\\Archive"
:create :create
"INBOX.Archive"; "INBOX.Archive";
# creates INBOX.Archive with use \Archive but # creates INBOX.Archive with use \Archive but
# with a different mailboxid. # with a different mailboxid.
4.3. Interaction with "fcc" extension 5. Interaction with "fcc" extension
This document extends the definition of the ":fcc" argument defined This document extends the definition of the ":fcc" argument defined
in [RFC8580] so that it can optionally be used with the ":mailboxid" in [RFC8580] so that it can optionally be used with the ":mailboxid"
argument. argument.
FCC =/ [":mailboxid" <mailboxid: string>] FCC =/ [":mailboxid" <mailboxid: string>]
If the optional ":mailboxid" argument is specified with ":fcc", it If the optional ":mailboxid" argument is specified with ":fcc", it
instructs the Sieve interpreter to check whether a mailbox exists instructs the Sieve interpreter to check whether a mailbox exists
with the specific mailboxid. If such a mailbox exists, the generated with the specific mailboxid. If such a mailbox exists, the generated
skipping to change at page 5, line 39 skipping to change at page 5, line 39
is filed into the ":fcc" target mailbox. is filed into the ":fcc" target mailbox.
Example: Example:
require ["enotify", "fcc", "mailboxid"]; require ["enotify", "fcc", "mailboxid"];
notify :fcc "INBOX.Sent" notify :fcc "INBOX.Sent"
:mailboxid "F6352ae03-b7f5-463c-896f-d8b48ee3" :mailboxid "F6352ae03-b7f5-463c-896f-d8b48ee3"
:message "You got mail!" :message "You got mail!"
"mailto:ken@example.com"; "mailto:ken@example.com";
5. Test ":mailboxidexists" 6. Test "mailboxidexists"
The "mailboxidexists" test is true if all mailboxes listed in the The "mailboxidexists" test is true if all mailboxes listed in the
"mailboxids" argument exist in the mailstore, and each allows the "mailboxids" argument exist in the mailstore, and each allows the
user in whose context the Sieve script runs to "deliver" messages user in whose context the Sieve script runs to "deliver" messages
into it. When the mailstore is an IMAP server, "delivery" of into it. When the mailstore is an IMAP server, "delivery" of
messages is possible if: messages is possible if:
a) the READ-WRITE response code is present for the mailbox (see a) the READ-WRITE response code is present for the mailbox (see
Section 7.1 of [RFC3501]), if IMAP Access Control List (ACL) Section 7.1 of [RFC3501]), if IMAP Access Control List (ACL)
[RFC4314] is not supported by the server, or [RFC4314] is not supported by the server, or
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"INBOX.harassment"; "INBOX.harassment";
} else { } else {
fileinto "INBOX.harassment"; fileinto "INBOX.harassment";
} }
} }
Note to implementers: this test behaves identically to the Note to implementers: this test behaves identically to the
"mailboxexists" test defined in [RFC5490] but operates on mailboxids "mailboxexists" test defined in [RFC5490] but operates on mailboxids
rather than mailbox names. rather than mailbox names.
6. Interaction with variables extension 7. Interaction with variables extension
There is no special interaction defined, however as an objectid is a There is no special interaction defined, however as an objectid is a
string in this document, objectid values can contain variable string in this document, objectid values can contain variable
expansions if [RFC5229] is enabled. expansions if [RFC5229] is enabled.
7. Formal Syntax 8. Formal Syntax
test /= "mailboxidexists" string-list test /= "mailboxidexists" string-list
tag /= ":mailboxid" string tag /= ":mailboxid" string
If [RFC8580] is supported: If [RFC8580] is supported:
FCC =/ [":mailboxid" <mailboxid: string>] FCC =/ [":mailboxid" <mailboxid: string>]
8. Security considerations 9. Security considerations
Because mailboxid is always generated by the server, implementations Because mailboxid is always generated by the server, implementations
MUST NOT allow sieve to make an endrun around this protection by MUST NOT allow sieve to make an endrun around this protection by
creating mailboxes with the specified ID by using ":create" and creating mailboxes with the specified ID by using ":create" and
":mailboxid" in a fileinto rule for a non-existant mailbox. ":mailboxid" in a fileinto rule for a non-existant mailbox.
Implementers are referred to the security considerations sections of Implementers are referred to the security considerations sections of
[RFC5228] and [RFC8474]. [RFC5228] and [RFC8474].
9. IANA considerations 10. IANA considerations
IANA are requested to add a capability to the sieve-extensions IANA are requested to add a capability to the sieve-extensions
registry: registry:
To: iana@iana.org To: iana@iana.org
Subject: Registration of new Sieve extension Subject: Registration of new Sieve extension
Capability name: mailboxid Capability name: mailboxid
Description: adds a test for checking mailbox existence by objectid, Description: adds a test for checking mailbox existence by objectid,
and new optional arguments to fileinto and :fcc which and new optional arguments to fileinto and :fcc which
allow selecting the destination mailbox by objectid. allow selecting the destination mailbox by objectid.
RFC number: this RFC RFC number: this RFC
Contact address: The EXTRA discussion list <extra@ietf.org> Contact address: The EXTRA discussion list <extra@ietf.org>
10. Acknowledgements 11. Acknowledgements
This document borrows heavily from [RFC5490] for the matching This document borrows heavily from [RFC5490] for the matching
mailboxexists test, and from [RFC8579] for an example of modifying mailboxexists test, and from [RFC8579] for an example of modifying
the fileinto command. the fileinto command.
Thanks to Ned Freed and Ken Murchison and Alexey Melnikov for Thanks to Ned Freed and Ken Murchison and Alexey Melnikov for
feedback on the EXTRA mailing list. feedback on the EXTRA mailing list.
11. Changes 12. Changes
(EDITOR: remove this section before publication) (EDITOR: remove this section before publication)
11.1. draft-ietf-sieve-mailboxid-01 12.1. draft-ietf-sieve-mailboxid-02
* removed bogus : from "mailboxidexists" test title
* moved FCC to its own top-level section since it is not used with
the fileinto command.
12.2. draft-ietf-sieve-mailboxid-01
* fixed idnits - RFC5228 not mentioned in the abstract * fixed idnits - RFC5228 not mentioned in the abstract
* fixed other I-D references I had missed, oops * fixed other I-D references I had missed, oops
11.2. draft-ietf-sieve-mailboxid-00 12.3. draft-ietf-sieve-mailboxid-00
* Adopted into working group per adoption call on list * Adopted into working group per adoption call on list
* Updated references to old drafts which have since been published. * Updated references to old drafts which have since been published.
* Fixed some typoes and simplified some language. * Fixed some typoes and simplified some language.
* Removed stray leading colon on mailboxexists (thanks Alexey) * Removed stray leading colon on mailboxexists (thanks Alexey)
* Added :fcc to the IANA registration description (thanks Alexey) * Added :fcc to the IANA registration description (thanks Alexey)
* Mentioned that variables can be expanded (thanks Alexey) * Mentioned that variables can be expanded (thanks Alexey)
11.3. draft-gondwana-sieve-mailboxid-02 12.4. draft-gondwana-sieve-mailboxid-02
* Update document date by a couple of years! Ooops, it got * Update document date by a couple of years! Ooops, it got
forgotten after a WGLC which got not dissent. forgotten after a WGLC which got not dissent.
* Create xml2rfc v3 output. * Create xml2rfc v3 output.
11.4. draft-gondwana-sieve-mailboxid-01 12.5. draft-gondwana-sieve-mailboxid-01
* Switch to :mailboxid tagged parameter value with fallback mailbox * Switch to :mailboxid tagged parameter value with fallback mailbox
name. name.
* Document interaction with "mailbox". * Document interaction with "mailbox".
* Document interaction with "special-use". * Document interaction with "special-use".
* Document interaction with "fcc". * Document interaction with "fcc".
* Document security considerations around :mailboxid and :create. * Document security considerations around :mailboxid and :create.
11.5. draft-gondwana-sieve-mailboxid-00 12.6. draft-gondwana-sieve-mailboxid-00
* Initial version. * Initial version.
12. Normative References 13. Normative References
[RFC5228] Guenther, P., Ed. and T. Showalter, Ed., "Sieve: An Email
Filtering Language", RFC 5228, DOI 10.17487/RFC5228,
January 2008, <https://www.rfc-editor.org/info/rfc5228>.
[RFC8474] Gondwana, B., Ed., "IMAP Extension for Object [RFC8474] Gondwana, B., Ed., "IMAP Extension for Object
Identifiers", RFC 8474, DOI 10.17487/RFC8474, September Identifiers", RFC 8474, DOI 10.17487/RFC8474, September
2018, <https://www.rfc-editor.org/info/rfc8474>. 2018, <https://www.rfc-editor.org/info/rfc8474>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC2342] Gahrns, M. and C. Newman, "IMAP4 Namespace", RFC 2342,
DOI 10.17487/RFC2342, May 1998,
<https://www.rfc-editor.org/info/rfc2342>.
[RFC5228] Guenther, P., Ed. and T. Showalter, Ed., "Sieve: An Email
Filtering Language", RFC 5228, DOI 10.17487/RFC5228,
January 2008, <https://www.rfc-editor.org/info/rfc5228>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC2342] Gahrns, M. and C. Newman, "IMAP4 Namespace", RFC 2342, 14. Informative References
DOI 10.17487/RFC2342, May 1998,
<https://www.rfc-editor.org/info/rfc2342>.
13. Informative References [RFC3501] Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - VERSION
4rev1", RFC 3501, DOI 10.17487/RFC3501, March 2003,
<https://www.rfc-editor.org/info/rfc3501>.
[RFC4314] Melnikov, A., "IMAP4 Access Control List (ACL) Extension",
RFC 4314, DOI 10.17487/RFC4314, December 2005,
<https://www.rfc-editor.org/info/rfc4314>.
[RFC5229] Homme, K., "Sieve Email Filtering: Variables Extension",
RFC 5229, DOI 10.17487/RFC5229, January 2008,
<https://www.rfc-editor.org/info/rfc5229>.
[RFC5490] Melnikov, A., "The Sieve Mail-Filtering Language -- [RFC5490] Melnikov, A., "The Sieve Mail-Filtering Language --
Extensions for Checking Mailbox Status and Accessing Extensions for Checking Mailbox Status and Accessing
Mailbox Metadata", RFC 5490, DOI 10.17487/RFC5490, March Mailbox Metadata", RFC 5490, DOI 10.17487/RFC5490, March
2009, <https://www.rfc-editor.org/info/rfc5490>. 2009, <https://www.rfc-editor.org/info/rfc5490>.
[RFC8579] Bosch, S., "Sieve Email Filtering: Delivering to Special- [RFC8579] Bosch, S., "Sieve Email Filtering: Delivering to Special-
Use Mailboxes", RFC 8579, DOI 10.17487/RFC8579, May 2019, Use Mailboxes", RFC 8579, DOI 10.17487/RFC8579, May 2019,
<https://www.rfc-editor.org/info/rfc8579>. <https://www.rfc-editor.org/info/rfc8579>.
[RFC8580] Murchison, K. and B. Gondwana, "Sieve Extension: File [RFC8580] Murchison, K. and B. Gondwana, "Sieve Extension: File
Carbon Copy (FCC)", RFC 8580, DOI 10.17487/RFC8580, May Carbon Copy (FCC)", RFC 8580, DOI 10.17487/RFC8580, May
2019, <https://www.rfc-editor.org/info/rfc8580>. 2019, <https://www.rfc-editor.org/info/rfc8580>.
[RFC3501] Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - VERSION
4rev1", RFC 3501, DOI 10.17487/RFC3501, March 2003,
<https://www.rfc-editor.org/info/rfc3501>.
[RFC5229] Homme, K., "Sieve Email Filtering: Variables Extension",
RFC 5229, DOI 10.17487/RFC5229, January 2008,
<https://www.rfc-editor.org/info/rfc5229>.
[RFC4314] Melnikov, A., "IMAP4 Access Control List (ACL) Extension",
RFC 4314, DOI 10.17487/RFC4314, December 2005,
<https://www.rfc-editor.org/info/rfc4314>.
Author's Address Author's Address
Bron Gondwana (editor) Bron Gondwana (editor)
Fastmail Fastmail
Level 2, 114 William St Level 2, 114 William St
Melbourne VIC 3000 Melbourne VIC 3000
Australia Australia
Email: brong@fastmailteam.com Email: brong@fastmailteam.com
URI: https://www.fastmail.com URI: https://www.fastmail.com
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