Re: [Dtls-iot] Last Call: <draft-ietf-dice-profile-14.txt> (TLS/DTLS Profiles for the Internet of Things) to Proposed Standard

<g_e_montenegro@yahoo.com> Thu, 03 September 2015 23:21 UTC

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Subject: Re: [Dtls-iot] Last Call: <draft-ietf-dice-profile-14.txt> (TLS/DTLS Profiles for the Internet of Things) to Proposed Standard
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Overall, looks good, thanks for this work. I do have some comments.
Not sure if these are "substantive comments" as requested, but after some discussion with some collegues we'd like to point out issues with some of the normative language.
In particular, we suggest modifying the language here:
 Hence, RFC 7366 and RFC 6066 are not applicable to this specification and MUST NOT be implemented.
Whereas CCM and AEAD ciphers in general render RFC7366 moot, a MUST NOT on implementation is too strong (i.e., from the intro, “This document does not alter TLS/DTLS specifications”) and potentially damaging: the same stack could be used for scenarios outside of IoT, where RFC7366 could still provide some benefit. As for RFC6066, a blanket statement saying it “MUST NOT implement” is not only wrong, it is also contradictory with other statements within this draft which recommend other parts of RFC6066. Instead, the language should limit itself to the specific extension of RFC6066. 
Also, with other extensions the doc does not prohibit *implementation*, but recommends against it or against its use (by using "NOT RECOMMENDED"). So I’d change the above text to something like:
In https://tools.ietf.org/html/draft-ietf-dice-profile-14#section-15: OLD:         Hence, RFC 7366 and RFC 6066 are not applicable to this        specification and MUST NOT be implemented.NEW:         Hence, RFC 7366 and the Truncated MAC extension of RFC 6066 are not applicable to this         specification and are NOT RECOMMENDED.
Similarly, in https://tools.ietf.org/html/draft-ietf-dice-profile-14#section-10 my suggestion would be: OLD:          This TLS/DTLS profile MUST NOT implement TLS/DTLS layer compression.NEW:          TLS/DTLS layer compression is NOT RECOMMENDED by this TLS/DTLS profile.
thanks,
Gabriel


     On Friday, August 21, 2015 6:53 AM, The IESG <iesg-secretary@ietf.org> wrote:
   
 

 
The IESG has received a request from the DTLS In Constrained Environments
WG (dice) to consider the following document:
- 'TLS/DTLS Profiles for the Internet of Things'
  <draft-ietf-dice-profile-14.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2015-09-04. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


  A common design pattern in Internet of Things (IoT) deployments is
  the use of a constrained device that collects data via sensor or
  controls actuators for use in home automation, industrial control
  systems, smart cities and other IoT deployments.

  This document defines a Transport Layer Security (TLS) and Datagram
  TLS (DTLS) 1.2 profile that offers communications security for this
  data exchange thereby preventing eavesdropping, tampering, and
  message forgery.  The lack of communication security is a common
  vulnerability in Internet of Things products that can easily be
  solved by using these well-researched and widely deployed Internet
  security protocols.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-dice-profile/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-dice-profile/ballot/


No IPR declarations have been submitted directly on this I-D.