Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)
RFC 8143

Document Type RFC - Proposed Standard (April 2017; No errata)
Updates RFC 4642
Was draft-elie-nntp-tls-recommendations (individual in art area)
Last updated 2017-04-21
Stream IETF
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Stream WG state Submitted to IESG for Publication
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IESG IESG state RFC 8143 (Proposed Standard)
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Responsible AD Alexey Melnikov
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                           J. Elie
Request for Comments: 8143                                    April 2017
Updates: 4642
Category: Standards Track
ISSN: 2070-1721

                  Using Transport Layer Security (TLS)
               with Network News Transfer Protocol (NNTP)

Abstract

   This document provides recommendations for improving the security of
   the Network News Transfer Protocol (NNTP) when using Transport Layer
   Security (TLS).  It modernizes the NNTP usage of TLS to be consistent
   with TLS best current practices.  This document updates RFC 4642.

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
   http://www.rfc-editor.org/info/rfc8143.

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.

Elie                         Standards Track                    [Page 1]
RFC 8143                   Using TLS with NNTP                April 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  Updates/Changes to RFC 4642 . . . . . . . . . . . . . . . . .   3
   3.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Compression . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Protocol Versions and Security Preferences  . . . . . . .   4
     3.3.  Server Name Indication  . . . . . . . . . . . . . . . . .   5
     3.4.  Prevention of SSL Stripping . . . . . . . . . . . . . . .   5
     3.5.  Authenticated Connections . . . . . . . . . . . . . . . .   5
     3.6.  Human Factors . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Detailed Changes to RFC 4642 . . . . . . . . . . . .  11
     A.1.  Related to TLS-Level Compression  . . . . . . . . . . . .  11
     A.2.  Related to Implicit TLS . . . . . . . . . . . . . . . . .  11
     A.3.  Related to RC4 Cipher Suites  . . . . . . . . . . . . . .  12
     A.4.  Related to Server Name Indication . . . . . . . . . . . .  12
     A.5.  Related to Certificate Verification . . . . . . . . . . .  12
     A.6.  Related to Other Obsolete Wording . . . . . . . . . . . .  13
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   The Network News Transfer Protocol (NNTP) [RFC3977] has been using
   Transport Layer Security (TLS) [RFC5246] along with its precursor,
   Secure Sockets Layer (SSL), since at least the year 2000.  The use of
   TLS in NNTP was formalized in [RFC4642], providing implementation
   recommendations at the same time.  In order to address the evolving
   threat model on the Internet today, this document provides stronger
   recommendations regarding that use.

   In particular, this document updates [RFC4642] by specifying that
   NNTP implementations and deployments MUST follow the best current
   practices documented in [BCP195], which currently consists of RFC
   7525 ("Recommendations for Secure Use of Transport Layer Security
   (TLS) and Datagram Transport Layer Security (DTLS)").  This includes
   stronger recommendations regarding SSL/TLS protocol versions,
   fallback to lower versions, TLS negotiation, TLS-level compression,
   TLS session resumption, cipher suites, public key lengths, forward
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