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)
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Author | Julien ÉLIE | ||
Last updated | 2017-04-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | No shepherd assigned | ||
Shepherd write-up | Show (last changed 2017-01-21) | ||
IESG | IESG state | RFC 8143 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Alexey Melnikov | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
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 secrecy, hostname validation, certificate verification, and other aspects of using TLS with NNTP. Elie Standards Track [Page 2]Show full document text