Re: [secdir] [payload] sec-dir review of draft-ietf-payload-rtp-opus-08

"Derek Atkins" <derek@ihtfp.com> Thu, 09 April 2015 14:19 UTC

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Date: Thu, 9 Apr 2015 10:19:35 -0400
From: "Derek Atkins" <derek@ihtfp.com>
To: "Ben Campbell" <ben@nostrum.com>
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Cc: "secdir@ietf.org" <secdir@ietf.org>, payload@ietf.org, jspittka@gmail.com, Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>, "iesg@ietf.org" <iesg@ietf.org>, payload-chairs@tools.ietf.org, koenvos74@gmail.com, Colin Perkins <csp@csperkins.org>
Subject: Re: [secdir] [payload] sec-dir review of draft-ietf-payload-rtp-opus-08
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On Thu, April 9, 2015 10:07 am, Ben Campbell wrote:
> On 9 Apr 2015, at 9:00, Derek Atkins wrote:
>
>> Ben,
>>
[snip]
>> So you're suggesting (and would be okay with) this text:
>>
>>  RTP packets using the payload format defined in this specification
>>  are subject to the security considerations discussed in the RTP
>>  specification RFC3550, and in any applicable RTP profile such as
>>  RTP/AVP [RFC3551], RTP/AVPF [RFC4585], RTP/SAVP [RFC3711] or RTP/
>>  SAVPF [RFC5124].  However, as "Securing the RTP Protocol Framework:
>>  Why RTP Does Not Mandate a Single Media Security Solution"
>>  [I-D.ietf-avt-srtp-not-mandatory] discusses it is not an RTP payload
>>  formats responsibility to discuss or mandate what solutions are used
>>  to meet the basic security goals like confidentiality, integrity and
>>  source authenticity for RTP in general.  This responsibility lays on
>>  anyone using RTP in an application.  They can find guidance on
>>  available security mechanisms and important considerations in Options
>>  for Securing RTP Sessions [I-D.ietf-avtcore-rtp-security-options].
>>  Applications SHOULD use an appropriate strong security mechanism.
>>
>
> I am okay with that text.
>
>> I think I'm okay with this.  (I kind of prefer my previous wording,
>> "Applications SHOULD implement at least one of the strong security
>> measures suggested by those references" only because it suggests that
>> multiple mechanisms are okay, whereas this new wording seems to imply
>> choosing only one).
>
> How about "Applications SHOULD use one or more strong security
> mechanisms, as appropriate"?

Clearly now we're just getting down to wordsmithing..  :)

How about "Applications SHOULD use one or more appropriate strong security
mechanisms"?  (The subclause "as apporpriate" feels to me like it could be
ignored, as in "well, using a strong security mechanism isn't
appropriate").  I think the goal is to make sure that "appropriate"
modifies the "strong security mechanism" and not the "SHOULD use"  ;)

What say you?

-derek

-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant