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Re: [quicwg/base-drafts] Add retry integrity tag (#3120)

David Schinazi <notifications@github.com> Sat, 19 October 2019 05:49 UTC

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Date: Fri, 18 Oct 2019 22:49:38 -0700
From: David Schinazi <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Add retry integrity tag (#3120)
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DavidSchinazi commented on this pull request.



> @@ -1197,6 +1197,64 @@ TLS ClientHello.  The server MAY retain these packets for later decryption in
 anticipation of receiving a ClientHello.
 
 
+## Retry Packet Integrity {#retry-integrity}
+
+Retry packets (see the Retry Packet section of {{QUIC-TRANSPORT}}) carry a
+Retry Integrity Tag that provides two properties: it allows discarding
+packets that have accidentally been corrupted by the network, and it mitigates
+off-path attackers' ability to send valid Retry packets.

We prevent off-path attackers from injecting Retry packets by including the Original Destination Connection ID in the associated data here. If they didn't see the client's Initial their Retry will not validate.

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