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Clients use the same crypto handshake after Retry #2746

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Merged
martinthomson merged 4 commits into from
Jun 18, 2019
Merged

Clients use the same crypto handshake after Retry #2746

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Clients use the same crypto handshake after Retry
martinthomson May 22, 2019
786cbf4
Keep the same packet numbers after Retry
martinthomson May 22, 2019
39786f4
Missed a critical word
martinthomson May 22, 2019
6e2b7e1
s/to 0// as redundant
martinthomson Jun 11, 2019
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15 changes: 9 additions & 6 deletions draft-ietf-quic-transport.md
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Expand Up @@ -3885,14 +3885,17 @@ the connection ID as part of its token validation logic (see
The next Initial packet from the client uses the connection ID and token values
from the Retry packet (see {{negotiating-connection-ids}}). Aside from this,
the Initial packet sent by the client is subject to the same restrictions as the
first Initial packet. A client can either reuse the cryptographic handshake
message or construct a new one at its discretion.
first Initial packet. A client MUST use the same cryptographic handshake
message it includes in this packet. A server MAY treat a packet that
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@marten-seemann marten-seemann May 22, 2019

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And it MUST NOT reset the packet number to 0.

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@ianswett ianswett Jun 10, 2019

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Said below, BTW.

contains a different cryptographic handshake message as a connection error or
discard it.

A client MAY attempt 0-RTT after receiving a Retry packet by sending 0-RTT
packets to the connection ID provided by the server. A client that sends
additional 0-RTT packets without constructing a new cryptographic handshake
message MUST NOT reset the packet number to 0 after a Retry packet; see
{{packet-0rtt}}.
packets to the connection ID provided by the server. A client MUST NOT change
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@ianswett ianswett Jun 10, 2019

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Suggested change
packets to the connection ID provided by the server. A client MUST NOT change
packets with the connection ID provided by the server. A client MUST NOT change

the cryptographic handshake message it sends in response to receiving a Retry.

A client MUST NOT reset the packet number for any packet number space after
processing a Retry packet; {{packet-0rtt}} contains more information on this.

A server acknowledges the use of a Retry packet for a connection using the
original_connection_id transport parameter (see
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