Re: [secdir] Secdir review of draft-ietf-ecrit-additional-data

Brian Rosen <br@brianrosen.net> Wed, 16 September 2015 19:39 UTC

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From: Brian Rosen <br@brianrosen.net>
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Date: Wed, 16 Sep 2015 15:38:55 -0400
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To: Randall Gellens <randy@qti.qualcomm.com>
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Cc: secdir@ietf.org, draft-ietf-ecrit-additional-data@tools.ietf.org
Subject: Re: [secdir] Secdir review of draft-ietf-ecrit-additional-data
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Don’t think so.

Brian
> On Sep 16, 2015, at 3:22 PM, Randall Gellens <randy@qti.qualcomm.com> wrote:
> 
> At 2:32 PM -0400 9/16/15, Brian Rosen wrote:
> 
>> TLS MUST be version 1.2 or later.  It is RECOMMENDED to use only
>>   cipher suites that offer Perfect Forward Secrecy (PFS), avoid
>>   Cipher Block Chaining (CBC) and follow the recommendations in BCP195.
> 
> Do we need to give examples of such suites?
> 
>> 
>>> On Sep 16, 2015, at 12:14 PM, Randall Gellens <randy@qti.qualcomm.com> wrote:
>>> 
>>> At 7:38 AM +0000 9/16/15, stephen.farrell@cs.tcd.ie wrote:
>>> 
>>>> On Wed Sep 16 04:09:03 2015 GMT+0100, Magnus Nyström wrote:
>>>>> Yes, at least mandating TLS 1.2 or higher and recommending as per above
>>>>> seems reasonable.
>>>>> The references for the GCM suites would be RFC 5288 and RFC 5289.
>>>> 
>>>> BCP195 has recent recommendations for most TLS options. I'd say it'd be best to use those or if not figure out why they're not correct for this context.
>>> 
>>> Just to be clear: are you suggesting that we replace text suggested by Magnus:
>>> 
>>>   TLS MUST be version 1.2 or later.  It is RECOMMENDED to use only
>>>   cypher suites that offer Perfect Forward Secrecy (PFS) and avoid
>>>   Cipher Block Chaining (CBC), for example,
>>>   TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
>>>   TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
>>>   TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
>>>   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
>>>   TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
>>>   TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 [RFC5288] [RFC5289].
>>> 
>>> With this:
>>> 
>>>   TLS MUST be version 1.2 or later.  It is RECOMMENDED follow
>>>   [BCP195].
>>> 
>>> 
>>> Note that BCP 195 does not address CBC (but does discuss PFS).  I just want to be clear before making the change, so please confirm that this works.
>>> 
>>> --
>>> Randall Gellens
>>> Opinions are personal;    facts are suspect;    I speak for myself only
>>> -------------- Randomly selected tag: ---------------
>>> If the odds are a million to one against something occurring, chances
>>> are 50-50 it will.
> 
> 
> 
> --
> Randall Gellens
> Opinions are personal;    facts are suspect;    I speak for myself only
> -------------- Randomly selected tag: ---------------
> It takes a wonderful brain and exquisite senses to produce a few
> stupid ideas.                                        --Santayana