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Re: [MMUSIC] Signaling Additional SRTP Context information via SDP - draft-davis-mmusic-srtp-assurance

"Kyzer Davis (kydavis)" <kydavis@cisco.com> Mon, 09 October 2023 20:44 UTC

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From: "Kyzer Davis (kydavis)" <kydavis@cisco.com>
To: "mmusic@ietf.org" <mmusic@ietf.org>
CC: "Esteban Valverde (jovalver)" <jovalver@cisco.com>, "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>
Thread-Topic: Signaling Additional SRTP Context information via SDP - draft-davis-mmusic-srtp-assurance
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Date: Mon, 09 Oct 2023 20:44:35 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/6HGB_pD9myLqToa4QQl9NRsQl9U>
Subject: Re: [MMUSIC] Signaling Additional SRTP Context information via SDP - draft-davis-mmusic-srtp-assurance
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Group,

 

I have posted draft 01 which covers the items from my previous email.

 

Name:     draft-davis-mmusic-srtp-assurance

Revision: 01

Title:    Signaling Additional SRTP Context information via SDP

Date:     2023-10-09

Group:    Individual Submission

Pages:    21

URL:
https://www.ietf.org/archive/id/draft-davis-mmusic-srtp-assurance-01.txt

Status:
https://datatracker.ietf.org/doc/draft-davis-mmusic-srtp-assurance/

HTML:
https://www.ietf.org/archive/id/draft-davis-mmusic-srtp-assurance-01.html

HTMLized:
https://datatracker.ietf.org/doc/html/draft-davis-mmusic-srtp-assurance

Diff:
https://author-tools.ietf.org/iddiff?url2=draft-davis-mmusic-srtp-assurance-
01

 

Thanks,

 

From: mmusic <mmusic-bounces@ietf.org> On Behalf Of Kyzer Davis (kydavis)
Sent: Thursday, August 10, 2023 11:30 AM
To: mmusic@ietf.org
Cc: Esteban Valverde (jovalver) <jovalver@cisco.com>
Subject: [MMUSIC] Signaling Additional SRTP Context information via SDP -
draft-davis-mmusic-srtp-assurance

 

Hello all,

 

I presented draft-davis-valverde-srtp-assurance-00 at Dispatch and the
outcome was to dispatch to MMUSIC WG.

I have re-submitted draft-davis-valverde-srtp-assurance-00 as
draft-davis-mmusic-srtp-assurance-00 with no changes.

 

To view that session and/slides see below:

- https://youtu.be/KT3mMX9CMdA?t=3113

-
https://datatracker.ietf.org/meeting/117/materials/slides-117-dispatch-sdp-s
ecurity-assurance-for-secure-real-time-transport-protocol-srtp

- A quick slide note, before the dispatch session I was working on a
draft-01 which leveraged Solution A in these slides while draft-00 uses
Solution B.

  - Jonathan Lennox brought up a good point after the session which favors
solution B:

  - Paraphrasing: "We know how implementations will handle unknown SDP
attributes; we do not know well how well how implementations will handle
unknown SDP Security Session Parameters"

    - I dug into this a bit more and tend to agree. So draft-01 now
continues to use solution B (a=srtpctx) new SDP Attribute to convey the
required SRTP Context information alongside a=crypto.

      - I have a full write-up on GitHub with far more details:
https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/5

 

In addition, some other draft-01 actions items that were brought up in chat,
at the mic or in person 1:1:

- "Why this can't be a RTP Header Extension" from Richard Barnes.
(https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/11)

- "Discuss sending some update when ROC updates" from Jonathan Rosenberg.
(https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/10)

  - Already text in the draft around this; which covers "99.9% of
scenarios".

- "Method to Convey Multiple SSRCs for a given stream" from various
(https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/1)

  - Two solutions proposed in the GitHub issue

- A statement Cullen Jennings made about focusing on the problem statements.

  - I want to re-write the problem sections like RFC7744 where each problem
in a scenario is cited as Ux.y and then discussed (Section 2.1.1 and 2.1.2)

  - I took a stab at a rough draft of this in "Discuss why SEQ is signaled
in the SDP" via
(https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/9)

  - Overall item is in
https://github.com/kyzer-davis/srtp-assurance-rfc-draft/issues/13

 

Lastly, the following items are already merged into draft-01 over on GitHub:

- Change contact name from IESG to IETF in IANA Considerations #2

- Discuss RFC4568 "Late Joiner" in problem statement: #3

- Split Serial forking scenario into its own section #4

- Add MIKEY considerations to Protocol Design section #6

- Change doc title #7 (new title: "Signaling Additional SRTP Context
information via SDP")

- Add SEQ abbreviation earlier #8

  

Thanks,

 

---

Kyzer Davis

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