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keep undecryptable packets when deriving 0-RTT and handshake keys (#4950)

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When receiving a ClientHello for a 0-RTT connection, this allows us to derive both 0-RTT and Handshake keys at the same time. The previous logic used to inadvertently discard previously undecryptable packets (e.g. reordered 0-RTT packets).
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Marten Seemann 2025-02-13 06:31:02 +01:00 • committed by GitHub
parent 5a1a34df37
commit 48b8182339
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1 changed files with 2 additions and 2 deletions
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4
connection.go
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@ -1553,8 +1553,8 @@ func (s *connection) handleHandshakeEvents(now time.Time) error {
s.restoreTransportParameters(ev.TransportParameters)
close(s.earlyConnReadyChan)
case handshake.EventReceivedReadKeys:
// Queue all packets for decryption that have been undecryptable so far.
s.undecryptablePacketsToProcess = s.undecryptablePackets
// queue all previously undecryptable packets
s.undecryptablePacketsToProcess = append(s.undecryptablePacketsToProcess, s.undecryptablePackets...)
s.undecryptablePackets = nil
case handshake.EventDiscard0RTTKeys:
err = s.dropEncryptionLevel(protocol.Encryption0RTT, now)