Updated Transport Layer Security (TLS) Server Identity Check Procedure for Email-Related Protocols (RFC7817)
Original Publication Date: 2016-Mar-01
Included in the Prior Art Database: 2016-Mar-25
Internet Society Requests For Comment (RFCs)
Use of TLS by SMTP Submission, IMAP, POP, and ManageSieve clients is described in [RFC3207], [RFC3501], [RFC2595], and [RFC5804], respectively. Each of the documents describes slightly different rules for server certificate identity verification (or doesn't define any rules at all). In reality, email client and server developers implement many of these protocols at the same time, so it would be good to define modern and consistent rules for verifying email server identities using TLS.
Internet Engineering Task Force (IETF) A. Melnikov Request for Comments: 7817 Isode Ltd Updates: 2595, 3207, 3501, 5804 March 2016 Category: Standards Track ISSN: 2070-1721
Updated Transport Layer Security (TLS) Server Identity Check Procedure for Email-Related Protocols
This document describes the Transport Layer Security (TLS) server identity verification procedure for SMTP Submission, IMAP, POP, and ManageSieve clients. It replaces Section 2.4 (Server Identity Check) of RFC 2595 and updates Section 4.1 (Processing After the STARTTLS Command) of RFC 3207, Section 11.1 (STARTTLS Security Considerations) of RFC 3501, and Section 2.2.1 (Server Identity Check) of RFC 5804.
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 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7817.
Copyright (c) 2016 IETF Trust and the persons identified as the document authors. All rights reserved.
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Melnikov Standards Track [Page 1]
RFC 7817 TLS Server Identity Check for Email March 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. Email Server Certificate Verification Rules . . . . . . . . . 3
4. Compliance Checklist for Certification Authorities . . . . . 5
4.1. Notes on Handling of Delegated Email Services by
Certification Authorities . . . . . . . . . . . . . . . . 5
5. Compliance Chec...