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implement marshalling of transport parameters for the session ticket

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When using 0-RTT, the client will reuse the transport parameters from
the last session. The server therefore needs to make sure that the
transport parameters haven't been changed in the mean time. To do so, it
encodes the transport parameters into the session ticket.
This commit is contained in:
Marten Seemann
2019-07-05 11:38:52 +07:00
parent 0b65a0c75e
commit ed0f426943
2 changed files with 128 additions and 6 deletions
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45
internal/handshake/transport_parameters.go
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@@ -369,6 +369,51 @@ func (p *TransportParameters) marshalVarintParam(b *bytes.Buffer, id transportPa
utils.WriteVarInt(b, val)
}
// MarshalForSessionTicket marshals the transport parameters we save in the session ticket.
// When sending a 0-RTT enabled TLS session tickets, we need to save the transport parameters.
// The client will remember the transport parameters used in the last session,
// and apply those to the 0-RTT data it sends.
// Saving the transport parameters in the ticket gives the server the option to reject 0-RTT
// if the transport parameters changed.
// Since the session ticket is encrypted, the serialization format is defined by the server.
// For convenience, we use the same format that we also use for sending the transport parameters.
func (p *TransportParameters) MarshalForSessionTicket() []byte {
b := &bytes.Buffer{}
b.Write([]byte{0, 0}) // length. Will be replaced later
// initial_max_stream_data_bidi_local
p.marshalVarintParam(b, initialMaxStreamDataBidiLocalParameterID, uint64(p.InitialMaxStreamDataBidiLocal))
// initial_max_stream_data_bidi_remote
p.marshalVarintParam(b, initialMaxStreamDataBidiRemoteParameterID, uint64(p.InitialMaxStreamDataBidiRemote))
// initial_max_stream_data_uni
p.marshalVarintParam(b, initialMaxStreamDataUniParameterID, uint64(p.InitialMaxStreamDataUni))
// initial_max_data
p.marshalVarintParam(b, initialMaxDataParameterID, uint64(p.InitialMaxData))
// initial_max_bidi_streams
p.marshalVarintParam(b, initialMaxStreamsBidiParameterID, uint64(p.MaxBidiStreamNum))
// initial_max_uni_streams
p.marshalVarintParam(b, initialMaxStreamsUniParameterID, uint64(p.MaxUniStreamNum))
data := b.Bytes()
binary.BigEndian.PutUint16(data[:2], uint16(b.Len()-2))
return data
}
// ValidFromSessionTicket checks if the transport parameters match those saved in the session ticket.
func (p *TransportParameters) ValidFromSessionTicket(data []byte) bool {
tp := &TransportParameters{}
if err := tp.Unmarshal(data, protocol.PerspectiveServer); err != nil {
return false
}
return p.InitialMaxStreamDataBidiLocal == tp.InitialMaxStreamDataBidiLocal &&
p.InitialMaxStreamDataBidiRemote == tp.InitialMaxStreamDataBidiRemote &&
p.InitialMaxStreamDataUni == tp.InitialMaxStreamDataUni &&
p.InitialMaxData == tp.InitialMaxData &&
p.MaxBidiStreamNum == tp.MaxBidiStreamNum &&
p.MaxUniStreamNum == tp.MaxUniStreamNum
}
// String returns a string representation, intended for logging.
func (p *TransportParameters) String() string {
logString := "&handshake.TransportParameters{OriginalConnectionID: %s, InitialMaxStreamDataBidiLocal: %#x, InitialMaxStreamDataBidiRemote: %#x, InitialMaxStreamDataUni: %#x, InitialMaxData: %#x, MaxBidiStreamNum: %d, MaxUniStreamNum: %d, MaxIdleTimeout: %s, AckDelayExponent: %d, MaxAckDelay: %s, ActiveConnectionIDLimit: %d"