Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)

Jana Iyengar <notifications@github.com> Tue, 14 May 2019 22:35 UTC

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Subject: Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)
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janaiyengar approved this pull request.

Just a couple of tiny nits, but LGTM. Thanks for working through this patiently!

> +Verifying the peer's Finished provides endpoints with an assurance that
+previous handshake messages have not been modified.  Note that the handshake
+does not complete on both endpoints simultaneously, therefore any requirements
+placed on endpoints based on the completion of the handshake are specific to
+the handshake being complete from the perspective of the endpoint in question.
+
+
+### Handshake Confirmed {#handshake-confirmed}
+
+In this document, the TLS handshake is considered confirmed when both of the
+following two conditions are met: the handshake is complete and the endpoint
+has received an acknowledgment for a packet sent with 1-RTT keys.  This second
+condition can be implemented by tracking the lowest packet number sent with
+1-RTT keys, and the highest value of the Largest Acknowledged field in any
+received 1-RTT ACK frame: once the latter is higher than or equal to the
+former, the handshake is confirmed.

I would at least suggest using "recording" instead of "tracking". It's a single event, not a continuous tracking.

> @@ -1116,9 +1146,22 @@ TLS KeyUpdate message.  Endpoints MUST treat the receipt of a TLS KeyUpdate
 message as a connection error of type 0x10a, equivalent to a fatal TLS alert of
 unexpected_message (see {{tls-errors}}).
 
-An endpoint MUST NOT initiate more than one key update at a time.  A new key
-cannot be used until the endpoint has received and successfully decrypted a
-packet with a matching KEY_PHASE.
+An endpoint MUST NOT initiate the first key update until the handshake is
+confirmed ({{handshake-confirmed}}). An endpoint MUST NOT initiate a subsequent
+key update until it has received an acknowledgment for a packet sent at the
+current KEY_PHASE.  This can be implemented by tracking the lowest packet

```suggestion
current KEY_PHASE.  This can be implemented by recording the lowest packet
```

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