Re: [quicwg/base-drafts] Specify behavior for post-handshake CRYPTO messages (#2524)

Martin Thomson <notifications@github.com> Mon, 18 March 2019 22:20 UTC

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Subject: Re: [quicwg/base-drafts] Specify behavior for post-handshake CRYPTO messages (#2524)
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martinthomson approved this pull request.

I think that this is good.  Thanks for doing the hard work Nick.

I believe that this issue can be resolved without chair involvement as it is a conclusion from the Tokyo meeting.

> +## Cryptographic Message Buffering
+
+Implementations need to maintain a buffer of CRYPTO data received out of order.
+Because there is no flow control of CRYPTO frames, an endpoint could
+potentially force its peer to buffer an unbounded amount of data.
+
+Implementations MUST support buffering at least 4096 bytes of data received in
+CRYPTO frames out of order. Endpoints MAY choose to allow more data to be
+buffered during the handshake. A larger limit during the handshake could allow
+for larger keys or credentials to be exchanged. An endpoint's buffer size does
+not need to remain constant during the life of the connection.
+
+Being unable to buffer CRYPTO frames during the handshake leads to a connection
+failure. If an endpoint's buffer is exceeded during the handshake, it can expand
+its buffer temporarily to complete the handshake. If an endpoint cannot expand
+its buffer, it MAY close the connection with a CRYPTO_BUFFER_EXCEEDED error

```suggestion
its buffer, it MUST close the connection with a CRYPTO_BUFFER_EXCEEDED error
```

I don't see any other recourse, do you?

> +CRYPTO frames out of order. Endpoints MAY choose to allow more data to be
+buffered during the handshake. A larger limit during the handshake could allow
+for larger keys or credentials to be exchanged. An endpoint's buffer size does
+not need to remain constant during the life of the connection.
+
+Being unable to buffer CRYPTO frames during the handshake leads to a connection
+failure. If an endpoint's buffer is exceeded during the handshake, it can expand
+its buffer temporarily to complete the handshake. If an endpoint cannot expand
+its buffer, it MAY close the connection with a CRYPTO_BUFFER_EXCEEDED error
+code.
+
+Once the handshake completes, if an endpoint is unable to buffer all data in a
+CRYPTO frame, it MAY discard all subsequent CRYPTO frames, or it MAY close the
+connection with an CRYPTO_BUFFER_EXCEEDED error code. If an endpoint chooses to
+discard all subsequent CRYPTO frames, the packets containing these CRYPTO frames
+are still acknowledged.

```suggestion
MUST be acknowledged.
```

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