Use of Transport Layer Security (TLS) in the Network News Transfer Protocol (NNTP)
draft-elie-nntp-tls-recommendations-05

Document Type Active Internet-Draft (individual in art area)
Last updated 2017-03-23 (latest revision 2017-02-07)
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Independent Submission                                           J. Elie
Internet-Draft                                          February 7, 2017
Updates: 4642 (if approved)
Intended status: Standards Track
Expires: August 11, 2017

                 Use of Transport Layer Security (TLS)
              in the Network News Transfer Protocol (NNTP)
                 draft-elie-nntp-tls-recommendations-05

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.  If approved, this document updates
   RFC 4642.

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 11, 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
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   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Elie                     Expires August 11, 2017                [Page 1]
Internet-Draft             Use of TLS in NNTP              February 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
     1.2.  Author's Note . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Updates/Changes to RFC 4642 . . . . . . . . . . . . . . . . .   3
   3.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Compression . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Protocol Versions and Security Preferences  . . . . . . .   5
     3.3.  Server Name Indication  . . . . . . . . . . . . . . . . .   5
     3.4.  Prevention of SSL Stripping . . . . . . . . . . . . . . .   5
     3.5.  Authenticated Connections . . . . . . . . . . . . . . . .   6
     3.6.  Human Factors . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     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
   Appendix B.  Acknowledgments  . . . . . . . . . . . . . . . . . .  13
   Appendix C.  Document History (to be removed by RFC Editor before
                publication) . . . . . . . . . . . . . . . . . . . .  13
     C.1.  Changes since -04 . . . . . . . . . . . . . . . . . . . .  13
     C.2.  Changes since -03 . . . . . . . . . . . . . . . . . . . .  14
     C.3.  Changes since -02 . . . . . . . . . . . . . . . . . . . .  14
     C.4.  Changes since -01 . . . . . . . . . . . . . . . . . . . .  14
     C.5.  Changes since -00 . . . . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   The Network News Transfer Protocol (NNTP) [RFC3977] has been using
   Transport Layer Security (TLS) [RFC5246] (along with its precursor,
   Secure Sockets Layer or SSL) since at least year 2000.  The use of
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