private bool ParsePreface(ReadableBuffer readableBuffer, out ReadCursor consumed, out ReadCursor examined)
{
consumed = readableBuffer.Start;
examined = readableBuffer.End;
if (readableBuffer.Length < ClientPreface.Length)
{
return(false);
}
var span = readableBuffer.IsSingleSpan
? readableBuffer.First.Span
: readableBuffer.ToSpan();
for (var i = 0; i < ClientPreface.Length; i++)
{
if (ClientPreface[i] != span[i])
{
throw new Exception("Invalid HTTP/2 connection preface.");
}
}
consumed = examined = readableBuffer.Move(readableBuffer.Start, ClientPreface.Length);
return(true);
}
public bool GenerateAndCompareServerVerify(ReadableBuffer buffer)
{
buffer = buffer.Slice(Unsafe.SizeOf <HandshakeHeader>());
var hashResult = new byte[_state.HandshakeHash.HashSize];
_state.HandshakeHash.FinishHash(hashResult);
_cryptoProvider.HashProvider.Tls12Prf(_state.CipherSuite.HashType, _masterSecret.Span, Tls12.Label_ServerFinished, hashResult, _serverVerify.Span);
return(CompareFunctions.ConstantTimeEquals(_serverVerify.Span, buffer.ToSpan()));
}
private Span<byte> HandleClientFinishedAbbreviated(ReadableBuffer messageBuffer)
{
var span = messageBuffer.ToSpan();
if (_secretSchedule.GenerateAndCompareClientVerify(span))
{
}
_state = HandshakeState.HandshakeCompleted;
_secretSchedule.DisposeStore();
return span;
}
private Span<byte> HandleClientKeyExchange(ReadableBuffer messageBuffer)
{
var span = messageBuffer.ToSpan();
HandshakeHash.HashData(span);
span = span.Slice(HandshakeFraming.HeaderSize);
KeyExchange.SetPeerKey(new BigEndianAdvancingSpan(span), _certificate, _signatureScheme);
_secretSchedule.GenerateMasterSecret(dispose: true);
_state = HandshakeState.WaitingForChangeCipherSpec;
return span;
}
public ExternalCertificate(ReadableBuffer buffer)
{
var reader = new BigEndianAdvancingSpan(buffer.ToSpan());
reader.Read <HandshakeHeader>();
reader = reader.ReadVector <UInt24>();
_certificate = new X509Certificate2(reader.ReadVector <UInt24>().ToArray());
if (reader.Length > 0)
{
_collection = new X509Certificate2Collection();
while (reader.Length > 0)
{
var cert = new X509Certificate2(reader.ReadVector <UInt24>().ToArray());
_collection.Add(cert);
}
}
Debug.Assert(reader.Length == 0);
_rsaPublicKey = _certificate.GetRSAPublicKey();
if (_rsaPublicKey != null)
{
_certificateType = CertificateType.rsa;
_signatureSize = _rsaPublicKey.KeySize / 8;
_certificateType = CertificateType.rsa;
return;
}
_ecdsaPublicKey = _certificate.GetECDsaPublicKey();
if (_ecdsaPublicKey != null)
{
_certificateType = CertificateType.ecdsa;
switch (_ecdsaPublicKey.KeySize)
{
case 256:
_signatureScheme = SignatureScheme.ecdsa_secp256r1_sha256;
_signatureSize = 72;
break;
case 384:
_signatureScheme = SignatureScheme.ecdsa_secp384r1_sha384;
throw new NotImplementedException();
case 521:
_signatureSize = 132;
_signatureScheme = SignatureScheme.ecdsa_secp521r1_sha512;
break;
default:
throw new InvalidOperationException($"Unsupported Ecdsa Keysize {_ecdsaPublicKey.KeySize}");
}
return;
}
}
public ServerHelloParser(ReadableBuffer buffer, SecurePipeConnection secureConnection)
{
_originalMessage = buffer.ToSpan();
var span = new BigEndianAdvancingSpan(_originalMessage);
span.Read <HandshakeHeader>();
_tlsVersion = span.Read <TlsVersion>();
_serverRandom = span.TakeSlice(TlsConstants.RandomLength).ToSpan();
_sessionId = span.ReadVector <byte>().ToSpan();
_cipherSuite = span.Read <ushort>();
var compression = span.Read <byte>(); //Dump compression
if (compression != 0)
{
Alerts.AlertException.ThrowAlert(Alerts.AlertLevel.Fatal, Alerts.AlertDescription.handshake_failure, "Compression is not supported");
}
_supportedGroups = default;
if (span.Length == 0)
{
return;
}
span = span.ReadVector <ushort>();
while (span.Length > 0)
{
var extType = span.Read <ExtensionType>();
var extBuffer = span.ReadVector <ushort>();
switch (extType)
{
case ExtensionType.supported_groups:
throw new NotImplementedException();
case ExtensionType.application_layer_protocol_negotiation:
throw new NotImplementedException();
case ExtensionType.server_name:
throw new NotImplementedException();
case ExtensionType.SessionTicket:
throw new NotImplementedException();
case ExtensionType.signature_algorithms:
throw new NotImplementedException();
case ExtensionType.renegotiation_info:
throw new NotImplementedException();
}
}
}
private void HandleClientFinished(out bool hasWritten, ReadableBuffer messageBuffer, out Span<byte> span)
{
span = messageBuffer.ToSpan();
if (_secretSchedule.GenerateAndCompareClientVerify(span))
{
_state = HandshakeState.HandshakeCompleted;
}
if (_requiresTicket)
{
_secretSchedule.WriteSessionTicket();
hasWritten = true;
RecordHandler.WriteRecords(Connection.HandshakeOutput.Reader, RecordType.Handshake);
}
WriteChangeCipherSpec();
_writeKey = _storedKey;
_secretSchedule.GenerateAndWriteServerVerify();
RecordHandler.WriteRecords(Connection.HandshakeOutput.Reader, RecordType.Handshake);
hasWritten = true;
_secretSchedule.DisposeStore();
}
public ServerKeyExchangeParser(ReadableBuffer reader)
{
var originalSpan = reader.ToSpan();
var span = new BigEndianAdvancingSpan(originalSpan);
span.Read <HandshakeHeader>();
_curveType = span.Read <ECCurveType>();
if (_curveType != ECCurveType.named_curve)
{
Alerts.AlertException.ThrowAlert(Alerts.AlertLevel.Fatal, Alerts.AlertDescription.handshake_failure, "We only support named curves");
}
_namedGroup = span.Read <NamedGroup>();
_key = span;
span.ReadVector <byte>();
var dataLength = originalSpan.Length - span.Length;
_data = originalSpan.Slice(4, dataLength - 4);
_signatureScheme = span.Read <SignatureScheme>();
_signature = span.ReadVector <ushort>().ToSpan();
Debug.Assert(span.Length == 0);
}
public ClientHelloParser(ReadableBuffer buffer, SecurePipeConnection secureConnection)
{
_originalMessage = buffer.ToSpan();
var span = new BigEndianAdvancingSpan(_originalMessage);
span.Read <HandshakeHeader>();
_tlsVersion = span.Read <TlsVersion>();
_clientRandom = span.TakeSlice(TlsConstants.RandomLength).ToSpan();
_sessionId = span.ReadVector <byte>().ToSpan();
_cipherSuite = span.ReadVector <ushort>();
_compressionMethods = span.ReadVector <byte>().ToSpan();
_negotiatedAlpn = ApplicationLayerProtocolType.None;
_hostName = null;
if (span.Length == 0)
{
return;
}
var extensionSpan = new BigEndianAdvancingSpan(span.ReadVector <ushort>().ToSpan());
while (extensionSpan.Length > 0)
{
var extType = extensionSpan.Read <ExtensionType>();
var extBuffer = extensionSpan.ReadVector <ushort>();
switch (extType)
{
case ExtensionType.application_layer_protocol_negotiation:
_negotiatedAlpn = secureConnection.Listener.AlpnProvider.ProcessExtension(extBuffer);
break;
case ExtensionType.server_name:
_hostName = secureConnection.Listener.HostNameProvider.ProcessHostNameExtension(extBuffer);
break;
case ExtensionType.signature_algorithms:
_signatureAlgos = extBuffer;
break;
case ExtensionType.supported_groups:
_supportedGroups = extBuffer;
break;
case ExtensionType.SessionTicket:
_sessionTicket = extBuffer;
break;
case ExtensionType.psk_key_exchange_modes:
case ExtensionType.pre_shared_key:
case ExtensionType.supported_versions:
case ExtensionType.key_share:
break;
}
}
if (span.Length > 0)
{
ThrowBytesLeftOver();
}
}
public AlertException(ReadableBuffer buffer)
: this(buffer.ToSpan())
{
}
private static void AssertResult(ReadableBuffer buffer)
{
var readerSpan = buffer.ToSpan();
Assert.Equal(s_clientFinishedDecrypted, readerSpan.ToArray());
}
