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

Randall Gellens <randy@qti.qualcomm.com> Wed, 16 September 2015 19:22 UTC

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Date: Wed, 16 Sep 2015 12:22:42 -0700
To: Brian Rosen <br@brianrosen.net>, Randall Gellens <randy@qti.qualcomm.com>
From: 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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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