forked from quic-go/quic-go
/
crypto_setup_tls.go
167 lines (143 loc) · 4.54 KB
/
crypto_setup_tls.go
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package handshake
import (
"errors"
"fmt"
"io"
"sync"
"github.com/bifurcation/mint"
"github.com/lucas-clemente/quic-go/internal/crypto"
"github.com/lucas-clemente/quic-go/internal/protocol"
)
// ErrCloseSessionForRetry is returned by HandleCryptoStream when the server wishes to perform a stateless retry
var ErrCloseSessionForRetry = errors.New("closing session in order to recreate after a retry")
// KeyDerivationFunction is used for key derivation
type KeyDerivationFunction func(crypto.TLSExporter, protocol.Perspective) (crypto.AEAD, error)
type cryptoSetupTLS struct {
mutex sync.RWMutex
perspective protocol.Perspective
keyDerivation KeyDerivationFunction
nullAEAD crypto.AEAD
aead crypto.AEAD
tls MintTLS
cryptoStream *CryptoStreamConn
aeadChanged chan<- protocol.EncryptionLevel
}
// NewCryptoSetupTLSServer creates a new TLS CryptoSetup instance for a server
func NewCryptoSetupTLSServer(
tls MintTLS,
cryptoStream *CryptoStreamConn,
nullAEAD crypto.AEAD,
aeadChanged chan<- protocol.EncryptionLevel,
version protocol.VersionNumber,
) CryptoSetup {
return &cryptoSetupTLS{
tls: tls,
cryptoStream: cryptoStream,
nullAEAD: nullAEAD,
perspective: protocol.PerspectiveServer,
keyDerivation: crypto.DeriveAESKeys,
aeadChanged: aeadChanged,
}
}
// NewCryptoSetupTLSClient creates a new TLS CryptoSetup instance for a client
func NewCryptoSetupTLSClient(
cryptoStream io.ReadWriter,
connID protocol.ConnectionID,
hostname string,
aeadChanged chan<- protocol.EncryptionLevel,
tls MintTLS,
version protocol.VersionNumber,
) (CryptoSetup, error) {
nullAEAD, err := crypto.NewNullAEAD(protocol.PerspectiveClient, connID, version)
if err != nil {
return nil, err
}
return &cryptoSetupTLS{
perspective: protocol.PerspectiveClient,
tls: tls,
nullAEAD: nullAEAD,
keyDerivation: crypto.DeriveAESKeys,
aeadChanged: aeadChanged,
}, nil
}
func (h *cryptoSetupTLS) HandleCryptoStream() error {
if h.perspective == protocol.PerspectiveServer {
// mint already wrote the ServerHello, EncryptedExtensions and the certificate chain to the buffer
// send out that data now
if _, err := h.cryptoStream.Flush(); err != nil {
return err
}
}
handshakeLoop:
for {
if alert := h.tls.Handshake(); alert != mint.AlertNoAlert {
return fmt.Errorf("TLS handshake error: %s (Alert %d)", alert.String(), alert)
}
switch h.tls.State() {
case mint.StateClientStart: // this happens if a stateless retry is performed
return ErrCloseSessionForRetry
case mint.StateClientConnected, mint.StateServerConnected:
break handshakeLoop
}
}
aead, err := h.keyDerivation(h.tls, h.perspective)
if err != nil {
return err
}
h.mutex.Lock()
h.aead = aead
h.mutex.Unlock()
// signal to the outside world that the handshake completed
h.aeadChanged <- protocol.EncryptionForwardSecure
close(h.aeadChanged)
return nil
}
func (h *cryptoSetupTLS) Open(dst, src []byte, packetNumber protocol.PacketNumber, associatedData []byte) ([]byte, protocol.EncryptionLevel, error) {
h.mutex.RLock()
defer h.mutex.RUnlock()
if h.aead != nil {
data, err := h.aead.Open(dst, src, packetNumber, associatedData)
if err != nil {
return nil, protocol.EncryptionUnspecified, err
}
return data, protocol.EncryptionForwardSecure, nil
}
data, err := h.nullAEAD.Open(dst, src, packetNumber, associatedData)
if err != nil {
return nil, protocol.EncryptionUnspecified, err
}
return data, protocol.EncryptionUnencrypted, nil
}
func (h *cryptoSetupTLS) GetSealer() (protocol.EncryptionLevel, Sealer) {
h.mutex.RLock()
defer h.mutex.RUnlock()
if h.aead != nil {
return protocol.EncryptionForwardSecure, h.aead
}
return protocol.EncryptionUnencrypted, h.nullAEAD
}
func (h *cryptoSetupTLS) GetSealerWithEncryptionLevel(encLevel protocol.EncryptionLevel) (Sealer, error) {
errNoSealer := fmt.Errorf("CryptoSetup: no sealer with encryption level %s", encLevel.String())
h.mutex.RLock()
defer h.mutex.RUnlock()
switch encLevel {
case protocol.EncryptionUnencrypted:
return h.nullAEAD, nil
case protocol.EncryptionForwardSecure:
if h.aead == nil {
return nil, errNoSealer
}
return h.aead, nil
default:
return nil, errNoSealer
}
}
func (h *cryptoSetupTLS) GetSealerForCryptoStream() (protocol.EncryptionLevel, Sealer) {
return protocol.EncryptionUnencrypted, h.nullAEAD
}
func (h *cryptoSetupTLS) DiversificationNonce() []byte {
panic("diversification nonce not needed for TLS")
}
func (h *cryptoSetupTLS) SetDiversificationNonce([]byte) {
panic("diversification nonce not needed for TLS")
}