SMTP TLS Reporting
draft-ietf-uta-smtp-tlsrpt-07
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2017-07-31
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draft-brotman-smtp-tlsrpt
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Using TLS in Applications D. Margolis
Internet-Draft Google, Inc
Intended status: Standards Track A. Brotman
Expires: February 1, 2018 Comcast, Inc
B. Ramakrishnan
Yahoo!, Inc
J. Jones
Microsoft, Inc
M. Risher
Google, Inc
July 31, 2017
SMTP TLS Reporting
draft-ietf-uta-smtp-tlsrpt-07
Abstract
A number of protocols exist for establishing encrypted channels
between SMTP Mail Transfer Agents, including STARTTLS [RFC3207], DANE
[RFC6698], and MTA-STS (TODO: Add ref). These protocols can fail due
to misconfiguration or active attack, leading to undelivered messages
or delivery over unencrypted or unauthenticated channels. This
document describes a reporting mechanism and format by which sending
systems can share statistics and specific information about potential
failures with recipient domains. Recipient domains can then use this
information to both detect potential attackers and diagnose
unintentional misconfigurations.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 1, 2018.
Margolis, et al. Expires February 1, 2018 [Page 1]
Internet-Draft SMTP-TLSRPT July 2017
Copyright Notice
Copyright (c) 2017 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
(http://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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Related Technologies . . . . . . . . . . . . . . . . . . . . 4
3. Reporting Policy . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Example Reporting Policy . . . . . . . . . . . . . . . . 6
3.1.1. Report using MAILTO . . . . . . . . . . . . . . . . . 6
3.1.2. Report using HTTPS . . . . . . . . . . . . . . . . . 6
4. Reporting Schema . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Report Time-frame . . . . . . . . . . . . . . . . . . . . 7
4.2. Delivery Summary . . . . . . . . . . . . . . . . . . . . 7
4.2.1. Success Count . . . . . . . . . . . . . . . . . . . . 7
4.2.2. Failure Count . . . . . . . . . . . . . . . . . . . . 7
4.3. Result Types . . . . . . . . . . . . . . . . . . . . . . 7
4.3.1. Negotiation Failures . . . . . . . . . . . . . . . . 7
4.3.2. Policy Failures . . . . . . . . . . . . . . . . . . . 8
4.3.3. General Failures . . . . . . . . . . . . . . . . . . 8
4.3.4. Transient Failures . . . . . . . . . . . . . . . . . 9
4.4. JSON Report Schema . . . . . . . . . . . . . . . . . . . 9
5. Report Delivery . . . . . . . . . . . . . . . . . . . . . . . 11
5.1. Report Filename . . . . . . . . . . . . . . . . . . . . . 11
5.2. Compression . . . . . . . . . . . . . . . . . . . . . . . 12
5.3. Email Transport . . . . . . . . . . . . . . . . . . . . . 12
5.3.1. Example Report . . . . . . . . . . . . . . . . . . . 14
5.4. HTTPS Transport . . . . . . . . . . . . . . . . . . . . . 14
5.5. Delivery Retry . . . . . . . . . . . . . . . . . . . . . 15
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