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Re: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 02 March 2016 17:00 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09
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Date: Wed, 02 Mar 2016 16:59:58 +0000
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Cc: "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Draft new version: draft-ietf-mmusic-dtls-sdp-09
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Hi,

>> So, do we still need some changes in draft-dtls-sdp?
>>
>> Perhaps we should completely remove section 3.4 (“Multiple SDP 
>> fingerprint attributes”), and cover it in the 4572 update?
>
> Every place in the document that mentions "fingerprint" needs to be adjusted so it *allows* multiple fingerprints and makes sense if there are more than one. (You got some but not all of them.)

That change I have done, and it will be in the next version of the document.

> Hopefully anything that deals with the semantics of having multiple fingerprints can be delegated to 4572bis. That includes what it means if a fingerprint is added, removed, changed.

So, you're ok with removing section 3.4 from draft-dtls-sdp?

Note that currently draft-4572-update is currently not intended as a 4572bis.

Regards,

Christer


> *From:*Roman Shpount [mailto:roman@telurix.com]
> *Sent:* 02 March 2016 18:27
> *To:* Christer Holmberg <christer.holmberg@ericsson.com>
> *Cc:* Paul Kyzivat <pkyzivat@alum.mit.edu>; Martin Thomson 
> <martin.thomson@gmail.com>; mmusic-chairs@ietf.org; mmusic@ietf.org
> *Subject:* Re: [MMUSIC] Draft new version: 
> draft-ietf-mmusic-dtls-sdp-09
>
> On Wed, Mar 2, 2016 at 11:25 AM, Christer Holmberg 
> <christer.holmberg@ericsson.com 
> <mailto:christer.holmberg@ericsson.com>>
> wrote:
>
>     Hi,
>
>      >>>     One of the certificates received during the DTLS handshake MUST
>      >>
>      >> Note: While there are multiple certificates in a DTLS handshake,
>     ONLY
>      >> the end-entity certificate should be checked.  Checking against
>     other
>      >> certificates would be a serious bug and a huge security
>     vulnerability.
>      >
>      > It would be good to say that somewhere.
>
>     Should that be said in the 4572 update? Or, is it DTLS-specific?
>
> This should be in 4572 update. This is not DTLS specific.
>
> _____________
> Roman Shpount
>

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