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92 lines
2.6 KiB
Go
92 lines
2.6 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/flynn/noise"
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"github.com/samber/oops"
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"github.com/sirupsen/logrus"
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)
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func (c *NoiseSession) RunIncomingHandshake() error {
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log.Debug("Starting incoming handshake")
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negData, msg, state, err := c.ComposeReceiverHandshakeMessage(*c.HandshakeKey(), nil, nil, nil)
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if err != nil {
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log.WithError(err).Error("Failed to compose receiver handshake message")
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return err
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}
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c.HandshakeState = &HandshakeState{
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HandshakeState: state,
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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("Receiver handshake message composed")
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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("Incoming handshake completed successfully")
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return nil
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}
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func (c *NoiseSession) ComposeReceiverHandshakeMessage(localStatic noise.DHKey, remoteStatic []byte, payload []byte, ephemeralPrivate []byte) (negData, msg []byte, state *noise.HandshakeState, err error) {
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log.Debug("Starting ComposeReceiverHandshakeMessage")
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if len(remoteStatic) != 0 && len(remoteStatic) != noise.DH25519.DHLen() {
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log.WithField("rs_length", len(remoteStatic)).Error("Invalid remote static key length")
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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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negData = make([]byte, 6)
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copy(negData, initNegotiationData(nil))
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pattern := noise.HandshakeXK
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negData[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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log.Debug("Using crypto/rand as random source")
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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: false,
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StaticKeypair: localStatic,
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Random: random,
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}
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state, 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 2, expecting no CipherStates yet
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msg, cs0, cs1, err := state.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 2")
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}
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return negData, msg, state, nil
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}
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