TLS Server Identity Pinning with Tickets
draft-sheffer-tls-pinning-ticket-05

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Last updated 2017-09-15
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Network Working Group                                         Y. Sheffer
Internet-Draft                                                    Intuit
Intended status: Experimental                                 D. Migault
Expires: March 19, 2018                                         Ericsson
                                                      September 15, 2017

                TLS Server Identity Pinning with Tickets
                  draft-sheffer-tls-pinning-ticket-05

Abstract

   Misissued public-key certificates can prevent TLS clients from
   appropriately authenticating the TLS server.  Several alternatives
   have been proposed to detect this situation and prevent a client from
   establishing a TLS session with a TLS end point authenticated with an
   illegitimate public-key certificate, but none is currently in wide
   use.

   This document proposes to extend TLS with opaque pinning tickets as a
   way to pin the server's identity.  During an initial TLS session, the
   server provides an original encrypted pinning ticket.  In subsequent
   TLS session establishment, upon receipt of the pinning ticket, the
   server proves its ability to decrypt the pinning ticket and thus the
   ownership if the pinning protection key.  The client can now safely
   conclude that the TLS session is established with the same TLS server
   as the original TLS session.  One of the important properties of this
   proposal is that no manual management actions are required.

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 March 19, 2018.

Sheffer & Migault        Expires March 19, 2018                 [Page 1]
Internet-Draft               Pinning Tickets              September 2017

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions used in this document . . . . . . . . . . . .   6
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   6
     2.1.  Initial Connection  . . . . . . . . . . . . . . . . . . .   6
     2.2.  Subsequent Connections  . . . . . . . . . . . . . . . . .   8
     2.3.  Indexing the Pins . . . . . . . . . . . . . . . . . . . .   9
   3.  Message Definitions . . . . . . . . . . . . . . . . . . . . .   9
   4.  Cryptographic Operations  . . . . . . . . . . . . . . . . . .  10
     4.1.  Pinning Secret  . . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Pinning Ticket  . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Pinning Protection Key  . . . . . . . . . . . . . . . . .  11
     4.4.  Pinning Proof . . . . . . . . . . . . . . . . . . . . . .  11
   5.  Operational Considerations  . . . . . . . . . . . . . . . . .  12
     5.1.  Protection Key Synchronization  . . . . . . . . . . . . .  12
     5.2.  Ticket Lifetime . . . . . . . . . . . . . . . . . . . . .  12
     5.3.  Certificate Renewal . . . . . . . . . . . . . . . . . . .  13
     5.4.  Certificate Revocation  . . . . . . . . . . . . . . . . .  13
     5.5.  Disabling Pinning . . . . . . . . . . . . . . . . . . . .  13
     5.6.  Server Compromise . . . . . . . . . . . . . . . . . . . .  13
     5.7.  Disaster Recovery . . . . . . . . . . . . . . . . . . . .  14
   6.  Previous Work . . . . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  Comparison: HPKP  . . . . . . . . . . . . . . . . . . . .  14
     6.2.  Comparison: TACK  . . . . . . . . . . . . . . . . . . . .  17
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  17
     7.1.  Mint Fork . . . . . . . . . . . . . . . . . . . . . . . .  18
       7.1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . .  18
       7.1.2.  Description . . . . . . . . . . . . . . . . . . . . .  18
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