76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
package dtls
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/pion/dtls/v2/pkg/crypto/prf"
|
|
"github.com/pion/dtls/v2/pkg/protocol"
|
|
"github.com/pion/dtls/v2/pkg/protocol/alert"
|
|
"github.com/pion/dtls/v2/pkg/protocol/handshake"
|
|
"github.com/pion/dtls/v2/pkg/protocol/recordlayer"
|
|
)
|
|
|
|
func flight5bParse(ctx context.Context, c flightConn, state *State, cache *handshakeCache, cfg *handshakeConfig) (flightVal, *alert.Alert, error) {
|
|
_, msgs, ok := cache.fullPullMap(state.handshakeRecvSequence-1,
|
|
handshakeCachePullRule{handshake.TypeFinished, cfg.initialEpoch + 1, false, false},
|
|
)
|
|
if !ok {
|
|
// No valid message received. Keep reading
|
|
return 0, nil, nil
|
|
}
|
|
|
|
if _, ok = msgs[handshake.TypeFinished].(*handshake.MessageFinished); !ok {
|
|
return 0, &alert.Alert{Level: alert.Fatal, Description: alert.InternalError}, nil
|
|
}
|
|
|
|
// Other party may re-transmit the last flight. Keep state to be flight5b.
|
|
return flight5b, nil, nil
|
|
}
|
|
|
|
func flight5bGenerate(c flightConn, state *State, cache *handshakeCache, cfg *handshakeConfig) ([]*packet, *alert.Alert, error) { //nolint:gocognit
|
|
var pkts []*packet
|
|
|
|
pkts = append(pkts,
|
|
&packet{
|
|
record: &recordlayer.RecordLayer{
|
|
Header: recordlayer.Header{
|
|
Version: protocol.Version1_2,
|
|
},
|
|
Content: &protocol.ChangeCipherSpec{},
|
|
},
|
|
})
|
|
|
|
if len(state.localVerifyData) == 0 {
|
|
plainText := cache.pullAndMerge(
|
|
handshakeCachePullRule{handshake.TypeClientHello, cfg.initialEpoch, true, false},
|
|
handshakeCachePullRule{handshake.TypeServerHello, cfg.initialEpoch, false, false},
|
|
handshakeCachePullRule{handshake.TypeFinished, cfg.initialEpoch + 1, false, false},
|
|
)
|
|
|
|
var err error
|
|
state.localVerifyData, err = prf.VerifyDataClient(state.masterSecret, plainText, state.cipherSuite.HashFunc())
|
|
if err != nil {
|
|
return nil, &alert.Alert{Level: alert.Fatal, Description: alert.InternalError}, err
|
|
}
|
|
}
|
|
|
|
pkts = append(pkts,
|
|
&packet{
|
|
record: &recordlayer.RecordLayer{
|
|
Header: recordlayer.Header{
|
|
Version: protocol.Version1_2,
|
|
Epoch: 1,
|
|
},
|
|
Content: &handshake.Handshake{
|
|
Message: &handshake.MessageFinished{
|
|
VerifyData: state.localVerifyData,
|
|
},
|
|
},
|
|
},
|
|
shouldEncrypt: true,
|
|
resetLocalSequenceNumber: true,
|
|
})
|
|
|
|
return pkts, nil, nil
|
|
}
|