Gossiping in CT
draft-ietf-trans-gossip-00

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Last updated 2015-08-28
Replaces draft-linus-trans-gossip-ct
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TRANS                                                        L. Nordberg
Internet-Draft                                                  NORDUnet
Intended status: Experimental                                 D. Gillmor
Expires: February 29, 2016                                          ACLU
                                                               T. Ritter

                                                         August 28, 2015

                            Gossiping in CT
                       draft-ietf-trans-gossip-00

Abstract

   This document describes three gossiping mechanisms for Certificate
   Transparency (CT) [RFC6962]: SCT Feedback, STH Pollination and
   Trusted Auditor Relationship.

   SCT Feedback enables HTTPS clients to share Signed Certificate
   Timestamps (SCTs) (Section 3.2 of [RFC6962]) with CT auditors in a
   privacy-preserving manner by sending SCTs to originating HTTPS
   servers which in turn share them with CT auditors.

   In STH Pollination, HTTPS clients use HTTPS servers as pools sharing
   Signed Tree Heads (STHs) (Section 3.5 of [RFC6962]) with other
   connecting clients in the hope that STHs will find their way to
   auditors and monitors.

   HTTPS clients in a Trusted Auditor Relationship share SCTs and STHs
   with trusted auditors or monitors directly, with expectations of
   privacy sensitive data being handled according to whatever privacy
   policy is agreed on between client and trusted party.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Nordberg, et al.        Expires February 29, 2016               [Page 1]
Internet-Draft               Gossiping in CT                 August 2015

   This Internet-Draft will expire on February 29, 2016.

Copyright Notice

   Copyright (c) 2015 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology and data flow . . . . . . . . . . . . . . . . . .   4
   4.  Who gossips . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  What to gossip about and how  . . . . . . . . . . . . . . . .   6
     5.1.  SCT Feedback  . . . . . . . . . . . . . . . . . . . . . .   6
       5.1.1.  HTTPS client to server  . . . . . . . . . . . . . . .   6
       5.1.2.  HTTPS server to auditors  . . . . . . . . . . . . . .   8
       5.1.3.  SCT Feedback data format  . . . . . . . . . . . . . .   9
     5.2.  STH pollination . . . . . . . . . . . . . . . . . . . . .   9
       5.2.1.  HTTPS client STH and Inclusion Proof Fetching . . . .  10
       5.2.2.  Auditor and Monitor Action  . . . . . . . . . . . . .  11
       5.2.3.  STH Pollination data format . . . . . . . . . . . . .  11
     5.3.  Trusted Auditor Stream  . . . . . . . . . . . . . . . . .  12
       5.3.1.  Trusted Auditor data format . . . . . . . . . . . . .  12
   6.  Security considerations . . . . . . . . . . . . . . . . . . .  12
     6.1.  Privacy considerations  . . . . . . . . . . . . . . . . .  12
       6.1.1.  Privacy and SCTs  . . . . . . . . . . . . . . . . . .  13
       6.1.2.  Privacy in SCT Feedback . . . . . . . . . . . . . . .  13
       6.1.3.  Privacy for HTTPS clients requesting STHs . . . . . .  13
       6.1.4.  Privacy in STH Pollination  . . . . . . . . . . . . .  14
       6.1.5.  Trusted Auditors for HTTPS Clients  . . . . . . . . .  14
       6.1.6.  HTTPS Clients as Auditors . . . . . . . . . . . . . .  15
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . .  15
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  15
   9.  ChangeLog . . . . . . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Changes between -01 and -02 . . . . . . . . . . . . . . .  16
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