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Re: [AVTCORE] Review of draft-engelbart-rtp-over-quic (David Schinazi)

David Schinazi <dschinazi.ietf@gmail.com> Tue, 31 May 2022 20:44 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Tue, 31 May 2022 13:44:16 -0700
Message-ID: <CAPDSy+5Yud2rU4-0jA2UnuKwaX6TGiof6QHECDvaRosHd1sdsA@mail.gmail.com>
To: Lucas Pardue <lucaspardue.24.7@gmail.com>
Cc: Joerg Ott <ott@in.tum.de>, Mathis Engelbart <mathis.engelbart@tum.de>, IETF AVTCore WG <avt@ietf.org>
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Subject: Re: [AVTCORE] Review of draft-engelbart-rtp-over-quic (David Schinazi)
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[ replacing my email address, as I left Apple more than 3 years ago :-) ]

The considerations I wrote that Bernard forwarded above applied to any use
of QUIC, be it client-to-server or p2p, as QUIC does not differentiate
between the two. As Lucas points out, if you want to use QUIC you have to
pick one ALPN per connection.

David

On Wed, May 25, 2022 at 12:33 PM Lucas Pardue <lucaspardue.24.7@gmail.com>
wrote:

> Hi Joerg, David,
>
> I don't have a strong stake in the upper L7 matters but FWIW
>
> RFC 9000 section 7 says: "The cryptographic handshake MUST provide ..
> authenticated negotiation of an application protocol (TLS uses
> Application-Layer Protocol Negotiation (ALPN) [ALPN
> <https://www.rfc-editor.org/rfc/rfc9000.html#ALPN>] for this purpose)"
> RFC 9001 section 8.1 says: "QUIC requires that the cryptographic handshake
> provide authenticated protocol negotiation. TLS uses Application-Layer
> Protocol Negotiation [ALPN] to select an application protocol. Unless
> another mechanism is used for agreeing on an application protocol,
> endpoints MUST use ALPN for this purpose."
>
> The QUIC implementations I'm familiar with will enforce these
> requirements. So for anyone writing an application mapping that expects
> interop, that really do need to explicitly define _an_ ALPN identifier OR
> state what exactly the alternative mechanism is.
>
> Cheers,
> Lucas
>
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