IMAP UNAUTHENTICATE Extension for Connection Reuse
RFC 8437
Document | Type |
RFC - Proposed Standard
(August 2018; No errata)
Updates RFC 3501
|
|
---|---|---|---|
Author | Chris Newman | ||
Last updated | 2018-08-24 | ||
Replaces | draft-extra-imap-unauth | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Bron Gondwana | ||
Shepherd write-up | Show (last changed 2018-03-29) | ||
IESG | IESG state | RFC 8437 (Proposed Standard) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Alexey Melnikov | ||
Send notices to | Bron Gondwana <brong@fastmailteam.com> | ||
IANA | IANA review state | IANA OK - Actions Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) C. Newman Request for Comments: 8437 Oracle Updates: 3501 August 2018 Category: Standards Track ISSN: 2070-1721 IMAP UNAUTHENTICATE Extension for Connection Reuse Abstract This specification extends the Internet Message Access Protocol (IMAP) to allow an administrative client to reuse the same IMAP connection on behalf of multiple IMAP user identities. 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/rfc8437. Copyright Notice Copyright (c) 2018 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 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. Newman Standards Track [Page 1] RFC 8437 IMAP UNAUTHENTICATE for Connection Reuse August 2018 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions Used in This Document . . . . . . . . . . . . . . 2 3. UNAUTHENTICATE Command . . . . . . . . . . . . . . . . . . . 3 4. Interactions . . . . . . . . . . . . . . . . . . . . . . . . 4 4.1. Stateful Extensions . . . . . . . . . . . . . . . . . . . 4 4.2. Client Certificates, SASL EXTERNAL, and imaps . . . . . . 5 5. Revised State Machine . . . . . . . . . . . . . . . . . . . . 6 6. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 7 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 8. Security Considerations . . . . . . . . . . . . . . . . . . . 7 9. Privacy Considerations . . . . . . . . . . . . . . . . . . . 8 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 8 10.1. Normative References . . . . . . . . . . . . . . . . . . 8 10.2. Informative References . . . . . . . . . . . . . . . . . 9 Appendix A. Design Considerations . . . . . . . . . . . . . . . 11 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 11 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Introduction Modern IMAP [RFC3501] server deployments often have peer systems with administrative privilege that perform actions on behalf of IMAP end users. For example, a voicemail gateway can use IMAP to store a user's voicemail and mark that voicemail as \Seen when the user listens to it via the phone interface. These systems can issue the IMAP AUTHENTICATE command with administrative credentials to act on behalf of other users. However, with the IMAP base specification, these specialized IMAP clients must close the connection and create a new connection for each user. For efficiency reasons, it is desirable for these clients to reuse the same connection, particularly if SSL has been negotiated. This specification proposes the UNAUTHENTICATE command to achieve this goal. The IMAP state machine described in Section 3 of RFC 3501 does not have a transition from authenticated or selected state to not authenticated state. The UNAUTHENTICATE command adds this transition. 2. Conventions Used in This Document 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. Newman Standards Track [Page 2] RFC 8437 IMAP UNAUTHENTICATE for Connection Reuse August 2018 3. UNAUTHENTICATE Command Arguments: None Responses: No specific response for this command Result: OK - Completed, now in not authenticated state BAD - Command unknown or arguments invalidShow full document text