Gossiping in CT
draft-linus-trans-gossip-ct-00

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Last updated 2014-10-27
Replaced by draft-ietf-trans-gossip
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TRANS                                                        L. Nordberg
Internet-Draft                                                  NORDUnet
Intended status: Experimental                           October 27, 2014
Expires: April 30, 2015

                            Gossiping in CT
                     draft-linus-trans-gossip-ct-00

Abstract

   This document describes gossiping in Certificate Transparency
   [RFC6962].

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 April 30, 2015.

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   Copyright (c) 2014 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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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Problem . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Who should gossip . . . . . . . . . . . . . . . . . . . . . .   3
   4.  What kind of data to gossip about . . . . . . . . . . . . . .   3
     4.1.  Signed Tree Heads . . . . . . . . . . . . . . . . . . . .   3
       4.1.1.  Web browsers  . . . . . . . . . . . . . . . . . . . .   3
       4.1.2.  CT monitors . . . . . . . . . . . . . . . . . . . . .   4
       4.1.3.  MTA:s . . . . . . . . . . . . . . . . . . . . . . . .   4
       4.1.4.  MUA:s . . . . . . . . . . . . . . . . . . . . . . . .   4
       4.1.5.  XMPP clients  . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Illegitimate Signed Certificate Timestamps  . . . . . . .   4
   5.  Security considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Open questions  . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Gossiping in Certificate Transparency (CT) can be split up in three
   pieces:

   o  A general gossip protocol.  This document uses
      [draft-linus-trans-gossip] for a general gossip protocol.

   o  Gossip strategy and policy - what data to gossip and how to deal
      with incoming gossip information.

   o  Gossiping rules, i.e. what type of data and with whom to gossip.

   The scope for this document is the last point, the gossiping rules.

2.  Problem

   Gossiping about what's known about CT logs helps solving the problem
   of detecting malicious logs showing different views to different
   clients, a.k.a. the partitioning attack.

   The separate problem of how to disseminate information about a log
   misbehaving in other ways may be helped by gossiping but poses a
   potential threat to the privacy of end users.  Gossiping about log
   data linkable to a specific log entry and through that to a specific
   site has to be constrained to using the gossiping message format and
   gossiping transports for sending sensitive data only to particular
   recipients.

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3.  Who should gossip

   o  TLS clients using PKIX (i.e. web browsers, MTA:s, MUA:s, XMPP
      clients)

   o  CT auditors and CT monitors

4.  What kind of data to gossip about

   This section describes what type of log data to gossip.

4.1.  Signed Tree Heads

   All CT clients SHOULD gossip about Signed Tree Heads (STH's) with as
   many other CT clients as possible.

   Gossiping about STH's enables detection of logs presenting more than
   one view of the log.
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