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

David Schinazi <notifications@github.com> Mon, 11 May 2020 21:50 UTC

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Date: Mon, 11 May 2020 14:50:24 -0700
From: David Schinazi <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)
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@DavidSchinazi commented on this pull request.



> +first Initial packet it sent in the initial_source_connection_id transport
+parameter; see {{transport-parameter-definitions}}. A server includes the
+Destination Connection ID field from the first Initial packet it received from
+the client in the original_destination_connection_id transport parameter; if
+the server sent a Retry packet this refers to the first Initial packet received
+before sending the Retry packet. If it sends a Retry packet, a server also
+includes the Source Connection ID field from the Retry packet in the
+retry_source_connection_id transport parameter.
+
+The values provided by a peer for these transport parameters MUST match the
+values that an endpoint used in the Destination and Source Connection ID fields
+of Initial packets that it sent. Including connection ID values in transport
+parameters and verifying them ensures that that an attacker cannot influence
+the choice of connection ID for a successful connection by injecting packets
+carrying attacker-chosen connection IDs during the handshake. An endpoint MUST
+treat any of the following as a connection error of type PROTOCOL_VIOLATION:

I'm not sure I agree. TRANSPORT_PARAMETER_ERROR indicates a parse issue, whereas this validation is performed somewhere else in our implementation.

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