Certificate Transparency
draft-laurie-pki-sunlight-11

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Document Type Active Internet-Draft (individual)
Last updated 2013-04-16
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Intended RFC status Experimental
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Network Working Group                                          B. Laurie
Internet-Draft                                                A. Langley
Intended status: Experimental                                  E. Kasper
Expires: October 18, 2013                                         Google
                                                          April 16, 2013

                        Certificate Transparency
                      draft-laurie-pki-sunlight-11

Abstract

   This document describes an experimental protocol for publicly logging
   the existence of TLS certificates as they are issued or observed, in
   a manner that allows anyone to audit certificate authority activity
   and notice the issuance of suspect certificates, as well as to audit
   the certificate logs themselves.  The intent is that eventually
   clients would refuse to honor certificates which do not appear in a
   log, effectively forcing CAs to add all issued certificates to the
   logs.

   Logs are network services which implement the protocol operations for
   submissions and queries that are defined in this document.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on October 18, 2013.

Copyright Notice

   Copyright (c) 2013 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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   (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.

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Table of Contents

   1.  Informal introduction  . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  5
     1.2.  Data structures  . . . . . . . . . . . . . . . . . . . . .  5
   2.  Cryptographic components . . . . . . . . . . . . . . . . . . .  6
     2.1.  Merkle Hash Trees  . . . . . . . . . . . . . . . . . . . .  6
       2.1.1.  Merkle audit paths . . . . . . . . . . . . . . . . . .  6
       2.1.2.  Merkle consistency proofs  . . . . . . . . . . . . . .  7
       2.1.3.  Example  . . . . . . . . . . . . . . . . . . . . . . .  8
       2.1.4.  Signatures . . . . . . . . . . . . . . . . . . . . . . 10
   3.  Log Format and Operation . . . . . . . . . . . . . . . . . . . 11
     3.1.  Log Entries  . . . . . . . . . . . . . . . . . . . . . . . 11
     3.2.  Structure of the Signed Certificate Timestamp  . . . . . . 14
     3.3.  Including the Signed Certificate Timestamp in the TLS
           Handshake  . . . . . . . . . . . . . . . . . . . . . . . . 15
       3.3.1.  TLS Extension  . . . . . . . . . . . . . . . . . . . . 16
     3.4.  Merkle Tree  . . . . . . . . . . . . . . . . . . . . . . . 17
     3.5.  Signed Tree Head . . . . . . . . . . . . . . . . . . . . . 18
   4.  Log Client Messages  . . . . . . . . . . . . . . . . . . . . . 19
     4.1.  Add Chain to Log . . . . . . . . . . . . . . . . . . . . . 19
     4.2.  Add PreCertChain to Log  . . . . . . . . . . . . . . . . . 20
     4.3.  Retrieve Latest Signed Tree Head . . . . . . . . . . . . . 20
     4.4.  Retrieve Merkle Consistency Proof between two Signed
           Tree Heads . . . . . . . . . . . . . . . . . . . . . . . . 20
     4.5.  Retrieve Merkle Audit Proof from Log by Leaf Hash  . . . . 21
     4.6.  Retrieve Entries from Log  . . . . . . . . . . . . . . . . 21
     4.7.  Retrieve Accepted Root Certificates  . . . . . . . . . . . 22
     4.8.  Retrieve Entry+Merkle Audit Proof from Log . . . . . . . . 22
   5.  Clients  . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
     5.1.  Submitters . . . . . . . . . . . . . . . . . . . . . . . . 24
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