[quicwg/base-drafts] introduce a version alias transport parameter (#2573)

Marten Seemann <notifications@github.com> Mon, 01 April 2019 02:07 UTC

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Subject: [quicwg/base-drafts] introduce a version alias transport parameter (#2573)
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This is an attempt to solve the QUIC version ossification that was discussed in Prague.

Servers can announce a list of version aliases in the transport parameters. A version alias can be any valid QUIC version number, and the server guarantees to accept this version number as an alias for the currently used version. Each version alias comes with a lifetime for which it is valid, as well as a salt for the encryption of the Initial.
On subsequent connections, clients can use a version alias to establish a connection to the same server.

If widely deployed, middleboxes will get used to version numbers from the whole version number space being used for QUIC connections. Since they are unaware of the Initial salt being used for alias versions, they can't even decrypt the Initial packet.

In the current form, this PR lacks some text about the privacy implications of this proposal. A version alias is (yet another) cookie, so it should have the same properties as a token, i.e. a client shouldn't use the same version alias more than once, in order to avoid being identifiable to on-path observers.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/2573

-- Commit Summary --

  * draft some text about the version_aliases transport parameter
  * add an initial secret to the version alias
  * make the version alias lifetime a varint

-- File Changes --

    M draft-ietf-quic-transport.md (36)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/2573.patch
https://github.com/quicwg/base-drafts/pull/2573.diff

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