Network Working Group                                              Z. Hu
Internet-Draft                                                    L. Zhu
Intended status: Standards Track                            J. Heidemann
Expires: June 9, 2016                           USC/Information Sciences
                                                               Institute
                                                               A. Mankin
                                                              D. Wessels
                                                           Verisign Labs
                                                              P. Hoffman
                                                                   ICANN
                                                        December 7, 2015


        DNS over TLS: Initiation and Performance Considerations
                   draft-ietf-dprive-dns-over-tls-02

Abstract

   This document describes the use of TLS to provide privacy for DNS.
   Encryption provided by TLS eliminates opportunities for eavesdropping
   and on-path tampering with DNS queries in the network, such as
   discussed in RFC 7258.  In addition, this document specifies two
   usage profiles for DNS-over-TLS and provides advice on performance
   considerations to minimize overhead from using TCP and TLS with DNS.

   Note: this document was formerly named
   draft-ietf-dprive-start-tls-for-dns.  Its name has been changed to
   better describe the mechanism now used.  Please refer to working
   group archives under the former name for history and previous
   discussion.  [RFC Editor: please remove this paragraph prior to
   publication]

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."

   This Internet-Draft will expire on June 9, 2016.



Hu, et al.                Expires June 9, 2016                  [Page 1]

Internet-Draft                DNS over TLS                 December 2015


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
   (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 . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Reserved Words . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Establishing and Managing DNS-over-TLS Sessions  . . . . . . .  4
     3.1.  Session Initiation . . . . . . . . . . . . . . . . . . . .  4
     3.2.  TLS Handshake and Authentication . . . . . . . . . . . . .  4
     3.3.  Transmitting and Receiving Messages  . . . . . . . . . . .  5
     3.4.  Connection Reuse, Close and Reestablishment  . . . . . . .  5
   4.  Usage Profiles . . . . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  Opportunistic Privacy Profile  . . . . . . . . . . . . . .  7
     4.2.  Out-of-band Key-pinned Privacy Profile . . . . . . . . . .  7
   5.  Performance Considerations . . . . . . . . . . . . . . . . . .