Opportunistic Encryption for HTTP URIs
draft-ietf-httpbis-http2-encryption-00

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Document Type Active Internet-Draft (httpbis WG)
Last updated 2014-07-01 (latest revision 2014-06-14)
Replaces draft-nottingham-http2-encryption
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Network Working Group                                      M. Nottingham
Internet-Draft
Intended status: Experimental                                 M. Thomson
Expires: December 14, 2014                                       Mozilla
                                                           June 12, 2014

                 Opportunistic Encryption for HTTP URIs
                 draft-ietf-httpbis-http2-encryption-00

Abstract

   This describes how "http" URIs can be accessed using Transport Layer
   Security (TLS) to mitigate pervasive monitoring attacks.

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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   This Internet-Draft will expire on December 14, 2014.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Goals and Non-Goals . . . . . . . . . . . . . . . . . . .   2
     1.2.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  Using HTTP URIs over TLS  . . . . . . . . . . . . . . . . . .   3
   3.  Server Authentication . . . . . . . . . . . . . . . . . . . .   3
   4.  Interaction with "https" URIs . . . . . . . . . . . . . . . .   4
   5.  Requiring Use of TLS  . . . . . . . . . . . . . . . . . . . .   4
     5.1.  The HTTP-TLS Header Field . . . . . . . . . . . . . . . .   5
     5.2.  Operational Considerations  . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     6.1.  Security Indicators . . . . . . . . . . . . . . . . . . .   7
     6.2.  Downgrade Attacks . . . . . . . . . . . . . . . . . . . .   7
     6.3.  Privacy Considerations  . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   This document describes a use of HTTP Alternative Services
   [I-D.ietf-httpbis-alt-svc] to decouple the URI scheme from the use
   and configuration of underlying encryption, allowing a "http" URI to
   be accessed using TLS [RFC5246] opportunistically.

   Currently, "https" URIs requires acquiring and configuring a valid
   certificate, which means that some deployments find supporting TLS
   difficult.  Therefore, this document describes a usage model whereby
   sites can serve "http" URIs over TLS without being required to
   support strong server authentication.

   A mechanism for limiting the potential for active attacks is
   described in Section 5.  This provides clients with additional
   protection against them for a period after successfully connecting to
   a server using TLS.  This does not offer the same level of protection
   as afforded to "https" URIs, but increases the likelihood that an
   active attack be detected.

1.1.  Goals and Non-Goals

   The immediate goal is to make the use of HTTP more robust in the face
   of pervasive passive monitoring [RFC7258].

   A secondary goal is to limit the potential for active attacks.  It is
   not intended to offer the same level of protection as afforded to

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   "https" URIs, but instead to increase the likelihood that an active
   attack can be detected.

   A final (but significant) goal is to provide for ease of
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