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116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
package noise
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import (
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"bytes"
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"crypto/rand"
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"io"
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"github.com/sirupsen/logrus"
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"github.com/flynn/noise"
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"github.com/samber/oops"
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)
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func (c *NoiseSession) RunOutgoingHandshake() error {
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log.Debug("Starting outgoing handshake")
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negData, msg, state, err := c.ComposeInitiatorHandshakeMessage(nil, nil)
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if err != nil {
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log.WithError(err).Error("Failed to compose initiator handshake message")
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return err
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}
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log.WithFields(logrus.Fields{
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"negData_length": len(negData),
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"msg_length": len(msg),
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}).Debug("Initiator handshake message composed")
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c.HandshakeState = &HandshakeState{
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HandshakeState: state,
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}
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if _, err = c.Write(negData); err != nil {
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log.WithError(err).Error("Failed to write negotiation data")
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return err
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}
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log.Debug("Negotiation data written successfully")
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if _, err = c.Write(msg); err != nil {
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log.WithError(err).Error("Failed to write handshake message")
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return err
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}
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log.Debug("Handshake message written successfully")
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log.WithField("state", state).Debug("Handshake state after message write")
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log.Println(state)
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c.handshakeComplete = true
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log.Debug("Outgoing handshake completed successfully")
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return nil
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}
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func (c *NoiseSession) ComposeInitiatorHandshakeMessage(
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payload []byte,
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ephemeralPrivate []byte,
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) (
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negotiationData,
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handshakeMessage []byte,
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handshakeState *noise.HandshakeState,
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err error,
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) {
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log.Debug("Starting ComposeInitiatorHandshakeMessage")
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remoteStatic, err := c.peerStaticKey()
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if err != nil {
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return nil, nil, nil, oops.Errorf("Peer static key retrieval error: %s", err)
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}
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/*localStatic, err := c.localStaticKey()
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if err != nil {
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return nil, nil, nil, oops.Errorf("Local static key retrieval error: %s", err)
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}
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localStaticDH := noise.DHKey{
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Public: localStatic[:],
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Private: localStatic[:],
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}*/
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localStaticDH := *c.HandshakeKey()
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if len(remoteStatic) != 0 && len(remoteStatic) != noise.DH25519.DHLen() {
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return nil, nil, nil, oops.Errorf("only 32 byte curve25519 public keys are supported")
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}
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negotiationData = make([]byte, 6)
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copy(negotiationData, initNegotiationData(nil))
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pattern := noise.HandshakeXK
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negotiationData[5] = NOISE_PATTERN_XK
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var random io.Reader
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if len(ephemeralPrivate) == 0 {
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random = rand.Reader
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} else {
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random = bytes.NewBuffer(ephemeralPrivate)
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}
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config := noise.Config{
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CipherSuite: noise.NewCipherSuite(noise.DH25519, noise.CipherChaChaPoly, noise.HashSHA256),
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Pattern: pattern,
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Initiator: true,
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StaticKeypair: localStaticDH,
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Random: random,
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}
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handshakeState, err = noise.NewHandshakeState(config)
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if err != nil {
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return nil, nil, nil, err
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}
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// Write message, expecting no CipherStates yet since this is message 1
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handshakeMessage, cs0, cs1, err := handshakeState.WriteMessage(nil, payload)
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if err != nil {
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return nil, nil, nil, err
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}
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// Verify no CipherStates are returned yet
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if cs0 != nil || cs1 != nil {
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return nil, nil, nil, oops.Errorf("unexpected cipher states in message 1")
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}
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return negotiationData, handshakeMessage, handshakeState, nil
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}
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