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

Brian Rosen <br@brianrosen.net> Wed, 16 September 2015 18:32 UTC

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From: Brian Rosen <br@brianrosen.net>
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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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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.

> 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.