We're gonna need a bigger threat model
draft-farrell-etm-02

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Network Working Group                                         S. Farrell
Internet-Draft                                    Trinity College Dublin
Intended status: Informational                               May 1, 2019
Expires: November 2, 2019

                 We're gonna need a bigger threat model
                          draft-farrell-etm-02

Abstract

   We argue that an expanded threat model is needed for Internet
   protocol development as protocol endpoints can no longer be
   considered to be generally trustworthy for any general definition of
   "trustworthy."

   This draft will be a submission to the DEDR IAB workshop.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on November 2, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   include Simplified BSD License text as described in Section 4.e of

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Examples of deliberate adversarial behaviour in applications    4
     2.1.  Malware in curated application stores . . . . . . . . . .   4
     2.2.  Virtual private networks (VPNs) . . . . . . . . . . . . .   5
     2.3.  Compromised (home) networks . . . . . . . . . . . . . . .   5
     2.4.  Web browsers  . . . . . . . . . . . . . . . . . . . . . .   5
     2.5.  Web site policy deception . . . . . . . . . . . . . . . .   5
     2.6.  Tracking bugs in mail . . . . . . . . . . . . . . . . . .   6
     2.7.  Troll farms in online social networks . . . . . . . . . .   6
     2.8.  Smart televisions . . . . . . . . . . . . . . . . . . . .   6
     2.9.  So-called Internet of things  . . . . . . . . . . . . . .   7
   3.  Inadvertent adversarial behaviours  . . . . . . . . . . . . .   7
   4.  Possible directions for an expanded threat model  . . . . . .   8
     4.1.  Develop a BCP for privacy considerations  . . . . . . . .   8
     4.2.  Consider the user perspective . . . . . . . . . . . . . .   8
     4.3.  Consider ABuse-cases as well as use-cases . . . . . . . .   8
     4.4.  Re-consider protocol design "lore"  . . . . . . . . . . .   8
     4.5.  Isolation . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.6.  Transparency  . . . . . . . . . . . . . . . . . . . . . .   9
     4.7.  Minimise  . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.8.  Same-Origin Policy  . . . . . . . . . . . . . . . . . . .   9
     4.9.  Greasing  . . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Informative References  . . . . . . . . . . . . . . . . .  10
     9.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .  15
     A.1.  Changes from -01 to -02 . . . . . . . . . . . . . . . . .  15
     A.2.  Changes from -00 to -01 . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   [[There's a github repo for this -- issues and PRs are welcome there.
   <https://github.com/sftcd/etm> ]]

   [RFC3552], Section 3 defines an "Internet Threat Model" which has
   been commonly used when developing Internet protocols.  That assumes
   that "the end-systems engaging in a protocol exchange have not

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