Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)

Martin Thomson <> Wed, 11 March 2020 03:44 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)
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martinthomson commented on this pull request.

> @@ -4742,6 +4781,22 @@ active_connection_id_limit (0x0e):
   When a zero-length connection ID is being used, the active_connection_id_limit
   parameter MUST NOT be sent.
+handshake_connection_id (0x0f):
+: The value that the endpoint included in the Source Connection ID field of the
+  first Initial packet it sends during the handshake. Endpoints MUST validate
+  that this transport parameter is present and that it matches the value that
+  was received in Initial packets. Authenticating this value ensures that an
+  attacker is unable to influence the selection of connection IDs during the

Done! Thanks both.

As for the "mitigates" formulation, I think that we are safe in making claims, but I realize that we don't need to.  I've removed a lot of text from the transport parameter definitions and replaced it with a pointer to the new section.

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