Expect-CT Extension for HTTP
draft-stark-expect-ct-01

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Last updated 2016-12-01
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Network Working Group                                           E. Stark
Internet-Draft                                                    Google
Intended status: Experimental                          December 01, 2016
Expires: June 4, 2017

                      Expect-CT Extension for HTTP
                        draft-stark-expect-ct-01

Abstract

   This document defines a new HTTP header, named Expect-CT, that allows
   web host operators to instruct user agents to expect valid Signed
   Certificate Timestamps (SCTs) to be served on connections to these
   hosts.  When configured in enforcement mode, user agents (UAs) will
   remember that hosts expect SCTs and will refuse connections that do
   not conform to the UA's Certificate Transparency policy.  When
   configured in report-only mode, UAs will report the lack of valid
   SCTs to a URI configured by the host, but will allow the connection.
   By turning on Expect-CT, web host operators can discover
   misconfigurations in their Certificate Transparency deployments and
   ensure that misissued certificates accepted by UAs are discoverable
   in Certificate Transparency logs.

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 June 4, 2017.

Copyright Notice

   Copyright (c) 2016 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

Stark                     Expires June 4, 2017                  [Page 1]
Internet-Draft                  Expect-CT                  December 2016

   (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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Server and Client Behavior  . . . . . . . . . . . . . . . . .   4
     2.1.  Response Header Field Syntax  . . . . . . . . . . . . . .   4
       2.1.1.  The report-uri Directive  . . . . . . . . . . . . . .   5
       2.1.2.  The enforce Directive . . . . . . . . . . . . . . . .   6
       2.1.3.  The max-age Directive . . . . . . . . . . . . . . . .   6
     2.2.  Server Processing Model . . . . . . . . . . . . . . . . .   7
       2.2.1.  HTTP-over-Secure-Transport Request Type . . . . . . .   7
       2.2.2.  HTTP Request Type . . . . . . . . . . . . . . . . . .   7
     2.3.  User Agent Processing Model . . . . . . . . . . . . . . .   7
       2.3.1.  Expect-CT Header Field Processing . . . . . . . . . .   7
       2.3.2.  Noting an Expect-CT Host - Storage Model  . . . . . .   8
       2.3.3.  HTTP-Equiv <meta> Element Attribute . . . . . . . . .   9
     2.4.  Noting Expect-CT  . . . . . . . . . . . . . . . . . . . .   9
     2.5.  Evaluating Expect-CT Connections for CT Compliance  . . .  10
   3.  Reporting Expect-CT Failure . . . . . . . . . . . . . . . . .  11
     3.1.  Generating a violation report . . . . . . . . . . . . . .  11
     3.2.  Sending a violation report  . . . . . . . . . . . . . . .  13
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     4.1.  Maximum max-age . . . . . . . . . . . . . . . . . . . . .  13
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Usability Considerations  . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15
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