Towards Remote Procedure Call Encryption By Default
draft-ietf-nfsv4-rpc-tls-04

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Network File System Version 4                               T. Myklebust
Internet-Draft                                               Hammerspace
Updates: 5531 (if approved)                                C. Lever, Ed.
Intended status: Standards Track                                  Oracle
Expires: May 20, 2020                                  November 17, 2019

          Towards Remote Procedure Call Encryption By Default
                      draft-ietf-nfsv4-rpc-tls-04

Abstract

   This document describes a mechanism that, through the use of
   opportunistic Transport Layer Security (TLS), enables encryption of
   in-transit Remote Procedure Call (RPC) transactions while
   interoperating with ONC RPC implementations that do not support this
   mechanism.  This document updates RFC 5531.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 20, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Myklebust & Lever         Expires May 20, 2020                  [Page 1]
Internet-Draft                RPC-Over-TLS                 November 2019

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  RPC-Over-TLS in Operation . . . . . . . . . . . . . . . . . .   5
     4.1.  Discovering Server-side TLS Support . . . . . . . . . . .   5
     4.2.  Authentication  . . . . . . . . . . . . . . . . . . . . .   7
       4.2.1.  Using TLS with RPCSEC GSS . . . . . . . . . . . . . .   8
   5.  TLS Requirements  . . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Base Transport Considerations . . . . . . . . . . . . . .   8
       5.1.1.  Operation on TCP  . . . . . . . . . . . . . . . . . .   8
       5.1.2.  Operation on UDP  . . . . . . . . . . . . . . . . . .   9
       5.1.3.  Operation on Other Transports . . . . . . . . . . . .   9
     5.2.  TLS Peer Authentication . . . . . . . . . . . . . . . . .   9
       5.2.1.  X.509 Certificates Using PKIX trust . . . . . . . . .  10
       5.2.2.  X.509 Certificates Using Fingerprints . . . . . . . .  11
       5.2.3.  Pre-Shared Keys . . . . . . . . . . . . . . . . . . .  11
       5.2.4.  Token Binding . . . . . . . . . . . . . . . . . . . .  11
   6.  Implementation Status . . . . . . . . . . . . . . . . . . . .  12
     6.1.  DESY NFS server . . . . . . . . . . . . . . . . . . . . .  12
     6.2.  Hammerspace NFS server  . . . . . . . . . . . . . . . . .  12
     6.3.  Linux NFS server and client . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     7.1.  Limitations of an Opportunistic Approach  . . . . . . . .  13
       7.1.1.  STRIPTLS Attacks  . . . . . . . . . . . . . . . . . .  13
     7.2.  Multiple User Identity Realms . . . . . . . . . . . . . .  14
     7.3.  Security Considerations for AUTH_SYS on TLS . . . . . . .  14