public RecordMessage(MessageType messageType, ContentType contentType, ProtocolVersion version, byte[] bytes) {
this.messageType = messageType;
this.contentType = contentType;
this.version = version;
if (bytes != null)
this.fragment = bytes;
else
this.fragment = new byte[0];
this.length = (ushort)this.fragment.Length;
}
public RecordMessage(byte[] bytes, int offset)
{
if (bytes == null)
throw new ArgumentNullException();
if (offset < 0 || offset >= bytes.Length)
throw new ArgumentException();
this.messageType = MessageType.Encrypted;
this.contentType = (ContentType)bytes[offset];
this.version = new ProtocolVersion(bytes[offset + 1], bytes[offset + 2]);
this.length = (ushort)(bytes[offset + 3] * 256 + bytes[offset + 4]);
this.fragment = new byte[this.length];
Buffer.BlockCopy(bytes, offset + 5, this.fragment, 0, this.length);
}
private CompatibilityResult ProcessServerHello(byte[] bytes, int offset, int size) {
byte[] temp = new byte[m_Buffer.Length + size];
Array.Copy(m_Buffer, 0, temp, 0, m_Buffer.Length);
Array.Copy(bytes, offset, temp, m_Buffer.Length, size);
if (IsInvalidSsl3Hello(temp))
throw new SslException(AlertDescription.HandshakeFailure, "The server hello message uses a protocol that was not recognized.");
if (m_Buffer.Length + size < 11) { // not enough bytes
m_Buffer = temp;
return new CompatibilityResult(null, new SslRecordStatus(SslStatus.MessageIncomplete, null, null));
}
ProtocolVersion pv = new ProtocolVersion(temp[9], temp[10]);
if (SupportsProtocol(m_Options.Protocol, pv)) {
if (m_MinLayer.HandshakeLayer.GetVersion().GetVersionInt() != pv.GetVersionInt()) {
if (pv.GetVersionInt() == 30) { // SSL 3.0
m_MinLayer.HandshakeLayer = new Ssl3ClientHandshakeLayer(m_MinLayer.HandshakeLayer);
} else { // TLS 1.0
m_MinLayer.HandshakeLayer = new Tls1ClientHandshakeLayer(m_MinLayer.HandshakeLayer);
}
}
return new CompatibilityResult(m_MinLayer, m_MinLayer.ProcessBytes(temp, 0, temp.Length));
} else {
throw new SslException(AlertDescription.HandshakeFailure, "The client and server could not agree on the protocol version to use.");
}
}
protected SslHandshakeStatus ProcessClientHello(HandshakeMessage message) {
if (m_State != HandshakeType.Nothing && m_State != HandshakeType.Finished)
throw new SslException(AlertDescription.UnexpectedMessage, "ClientHello message must be the first message or must be preceded by a Finished message.");
m_IsNegotiating = true;
UpdateHashes(message, HashUpdate.All); // input message
// process ClientHello
ProtocolVersion pv = new ProtocolVersion(message.fragment[0], message.fragment[1]);
m_MaxClientVersion = pv;
if (CompatibilityLayer.SupportsProtocol(m_Options.Protocol, pv) && pv.GetVersionInt() != GetVersion().GetVersionInt())
throw new SslException(AlertDescription.IllegalParameter, "Unknown protocol version of the client.");
try {
// extract the time from the client [== 1 uint]
m_ClientTime = new byte[4];
Array.Copy(message.fragment, 2, m_ClientTime, 0, 4);
// extract the random bytes [== 28 bytes]
m_ClientRandom = new byte[28];
Array.Copy(message.fragment, 6, m_ClientRandom, 0, 28);
// extact the session ID [== 0..32 bytes]
int length = message.fragment[34];
if (length > 32)
throw new SslException(AlertDescription.IllegalParameter, "The length of the SessionID cannot be more than 32 bytes.");
m_SessionID = new byte[length];
Array.Copy(message.fragment, 35, m_SessionID, 0, length);
// extract the available cipher suites
length += 35;
int ciphers_size = message.fragment[length] * 256 + message.fragment[length + 1];
if (ciphers_size < 2 || ciphers_size % 2 != 0)
throw new SslException(AlertDescription.IllegalParameter, "The number of ciphers is invalid -or- the cipher length is not even.");
byte[] ciphers = new byte[ciphers_size];
Array.Copy(message.fragment, length + 2, ciphers, 0, ciphers_size);
m_EncryptionScheme = CipherSuites.GetCipherSuiteAlgorithm(ciphers, m_Options.AllowedAlgorithms);
// extract the available compression algorithms
length += ciphers_size + 2;
int compressors_size = message.fragment[length];
if (compressors_size == 0)
throw new SslException(AlertDescription.IllegalParameter, "No compressor specified.");
byte[] compressors = new byte[compressors_size];
Array.Copy(message.fragment, length + 1, compressors, 0, compressors_size);
m_CompressionMethod = CompressionAlgorithm.GetCompressionAlgorithm(compressors, m_Options.AllowedAlgorithms);
} catch (Exception e) {
throw new SslException(e, AlertDescription.InternalError, "The message is invalid.");
}
// create reply
return GetClientHelloResult();
}
// Thanks to Brandon for notifying us about a bug in this method
public override SslHandshakeStatus ProcessSsl2Hello(byte[] hello) {
if (m_State != HandshakeType.Nothing)
throw new SslException(AlertDescription.UnexpectedMessage, "SSL2 ClientHello message must be the first message.");
m_IsNegotiating = true;
m_State = HandshakeType.ClientHello;
UpdateHashes(hello, HashUpdate.All); // input message
// process ClientHello
ProtocolVersion pv = new ProtocolVersion(hello[1], hello[2]);
m_MaxClientVersion = pv;
if (CompatibilityLayer.SupportsProtocol(m_Options.Protocol, pv) && pv.GetVersionInt() != GetVersion().GetVersionInt())
throw new SslException(AlertDescription.IllegalParameter, "Unknown protocol version of the client.");
int csl = hello[3] * 256 + hello[4]; // cipher spec length
int sidl = hello[5] * 256 + hello[6]; // session id length
int cl = hello[7] * 256 + hello[8]; // challenge length
// process ciphers
byte[] ciphers = new byte[(csl / 3) * 2];
int offset = 10;
for(int i = 0; i < ciphers.Length; i+=2) {
Array.Copy(hello, offset, ciphers, i, 2);
offset += 3;
}
m_EncryptionScheme = CipherSuites.GetCipherSuiteAlgorithm(ciphers, m_Options.AllowedAlgorithms);
// process session id
m_SessionID = new byte[sidl];
Array.Copy(hello, 9 + csl, m_SessionID, 0, sidl);
// process random data [challenge]
m_ClientTime = new byte[4];
m_ClientRandom = new byte[28];
if (cl <= 28) {
Array.Copy(hello, 9 + csl + sidl, m_ClientRandom, m_ClientRandom.Length - cl, cl);
} else {
Array.Copy(hello, 9 + csl + sidl + (cl - 28), m_ClientRandom, 0, 28);
Array.Copy(hello, 9 + csl + sidl, m_ClientTime, 4 - (cl - 28), cl - 28);
}
m_CompressionMethod = SslAlgorithms.NULL_COMPRESSION;
return GetClientHelloResult();
}
public CompatibilityLayer(SocketController controller, SecurityOptions options)
{
m_Buffer = new byte[0];
m_MinVersion = GetMinProtocol(options.Protocol);
m_MaxVersion = GetMaxProtocol(options.Protocol);
this.handshakeMonitor = new SslTlsHandshakeMonitor();
HandshakeLayer layer = null;
if (m_MinVersion.GetVersionInt() == 30)
{ // SSL 3.0
if (options.Entity == ConnectionEnd.Client)
{
layer = new Ssl3ClientHandshakeLayer(null, options);
m_MinLayer = new RecordLayer(controller, layer as ClientHandshakeLayer);
this.handshakeMonitor.Attach(controller.Parent, layer as ClientHandshakeLayer);
}
else
{
layer = new Ssl3ServerHandshakeLayer(null, options);
m_MinLayer = new RecordLayer(controller, layer as ServerHandshakeLayer);
this.handshakeMonitor.Attach(controller.Parent, layer as ServerHandshakeLayer);
}
}
else
{ // TLS 1.0
if (options.Entity == ConnectionEnd.Client)
{
layer = new Tls1ClientHandshakeLayer(null, options);
m_MinLayer = new RecordLayer(controller, layer as ClientHandshakeLayer);
this.handshakeMonitor.Attach(controller.Parent, layer as ClientHandshakeLayer);
}
else
{
layer = new Tls1ServerHandshakeLayer(null, options);
m_MinLayer = new RecordLayer(controller, layer as ServerHandshakeLayer);
this.handshakeMonitor.Attach(controller.Parent, layer as ServerHandshakeLayer);
}
}
m_MinLayer.HandshakeLayer.RecordLayer = m_MinLayer;
m_Options = options;
}
private CompatibilityResult ProcessClientHello(byte[] bytes, int offset, int size)
{
byte[] temp = new byte[m_Buffer.Length + size];
Buffer.BlockCopy(m_Buffer, 0, temp, 0, m_Buffer.Length);
Buffer.BlockCopy(bytes, offset, temp, m_Buffer.Length, size);
if (IsInvalidSsl3Hello(temp) && IsInvalidSsl2Hello(temp)) // SSL2 hello
throw new SslException(AlertDescription.HandshakeFailure, "The client hello message uses a protocol that was not recognized.");
if (m_Buffer.Length + bytes.Length < 11 || (IsInvalidSsl3Hello(temp) && !IsSsl2HelloComplete(temp))) { // not enough bytes
m_Buffer = temp;
return new CompatibilityResult(null, new SslRecordStatus(SslStatus.MessageIncomplete, null, null));
}
ProtocolVersion pv;
if (!IsInvalidSsl3Hello(temp))
pv = new ProtocolVersion(temp[9], temp[10]);
else
pv = ExtractSsl2Version(temp);
if (pv.GetVersionInt() > m_MaxVersion.GetVersionInt())
pv = m_MaxVersion;
if (SupportsProtocol(m_Options.Protocol, pv)) {
if (m_MinLayer.HandshakeLayer.GetVersion().GetVersionInt() != pv.GetVersionInt()) {
if (pv.GetVersionInt() == 30) { // SSL 3.0
m_MinLayer.HandshakeLayer = new Ssl3ServerHandshakeLayer(m_MinLayer.HandshakeLayer);
} else { // TLS 1.0
m_MinLayer.HandshakeLayer = new Tls1ServerHandshakeLayer(m_MinLayer.HandshakeLayer);
}
}
if (!IsInvalidSsl3Hello(temp)) {
return new CompatibilityResult(m_MinLayer, m_MinLayer.ProcessBytes(temp, 0, temp.Length));
} else {
return new CompatibilityResult(m_MinLayer, m_MinLayer.ProcessSsl2Hello(ExtractSsl2Content(temp)));
}
} else {
throw new SslException(AlertDescription.HandshakeFailure, "The client and server could not agree on the protocol version to use.");
}
}
public static bool SupportsProtocol(SecureProtocol protocol, ProtocolVersion pv)
{
if (pv.GetVersionInt() == 30)
return SupportsSsl3(protocol);
else
return SupportsTls1(protocol);
}
public ServerHandshakeLayer(HandshakeLayer handshakeLayer)
: base(handshakeLayer)
{
m_MaxClientVersion = ((ServerHandshakeLayer)handshakeLayer).m_MaxClientVersion;
}
protected SslHandshakeStatus ProcessClientHello(HandshakeMessage message)
{
if (m_State != HandshakeType.Nothing && m_State != HandshakeType.Finished)
throw new SslException(AlertDescription.UnexpectedMessage, "ClientHello message must be the first message or must be preceded by a Finished message.");
Alert alert = null;
m_IsNegotiating = true;
UpdateHashes(message, HashUpdate.All); // input message
// process ClientHello
int currentLen = 0;
ProtocolVersion pv = new ProtocolVersion(message.fragment[currentLen++], message.fragment[currentLen++]);
m_MaxClientVersion = pv;
//Violation with tls spec. If remote side uses higher protocol version than your, then we must answer with your highest version
//if (CompatibilityLayer.SupportsProtocol(m_Options.Protocol, pv) && pv.GetVersionInt() != GetVersion().GetVersionInt())
// throw new SslException(AlertDescription.IllegalParameter, "Unknown protocol version of the client.");
try {
// extract the time from the client [== 1 uint]
m_ClientTime = new byte[4];
Buffer.BlockCopy(message.fragment, currentLen, m_ClientTime, 0, 4);
currentLen += 4;
// extract the random bytes [== 28 bytes]
m_ClientRandom = new byte[28];
Buffer.BlockCopy(message.fragment, currentLen, m_ClientRandom, 0, 28);
currentLen += 28;
// extact the session ID [== 0..32 bytes]
byte length = message.fragment[currentLen++];
if (length > 32)
throw new SslException(AlertDescription.IllegalParameter, "The length of the SessionID cannot be more than 32 bytes.");
m_SessionID = new byte[length];
Buffer.BlockCopy(message.fragment, currentLen, m_SessionID, 0, length);
currentLen += length;
// extract the available cipher suites
Int16 ciphers_size = BinaryHelper.Int16FromBytes(message.fragment[currentLen++], message.fragment[currentLen++]);//message.fragment[length] * 256 + message.fragment[length + 1];
if (ciphers_size < 2 || ciphers_size % 2 != 0)
throw new SslException(AlertDescription.IllegalParameter, "The number of ciphers is invalid -or- the cipher length is not even.");
byte[] ciphers = new byte[ciphers_size];
Buffer.BlockCopy(message.fragment, currentLen, ciphers, 0, ciphers_size);
currentLen += ciphers_size;
m_EncryptionScheme = CipherSuites.GetCipherSuiteAlgorithm(ciphers, m_Options.AllowedAlgorithms);
// extract the available compression algorithms
int compressors_size = message.fragment[currentLen++];
if (compressors_size == 0)
throw new SslException(AlertDescription.IllegalParameter, "No compressor specified.");
byte[] compressors = new byte[compressors_size];
Buffer.BlockCopy(message.fragment, currentLen, compressors, 0, compressors_size);
m_CompressionMethod = CompressionAlgorithm.GetCompressionAlgorithm(compressors, m_Options.AllowedAlgorithms);
currentLen += compressors_size;
try
{
if (message.fragment.Length > currentLen)
this.ProcessExtensions(message.fragment, ref currentLen, ConnectionEnd.Server);
}
catch (ALPNCantSelectProtocolException ex)
{
alert = new Alert(ex.Description, ex.Level);
}
} catch (Exception e) {
throw new SslException(e, AlertDescription.InternalError, "The message is invalid.");
}
// create reply
return GetClientHelloResult(alert);
}
public ServerHandshakeLayer(HandshakeLayer handshakeLayer)
: base(handshakeLayer)
{
m_MaxClientVersion = ((ServerHandshakeLayer)handshakeLayer).m_MaxClientVersion;
this.serverHelloExts = m_Options.ExtensionList;
}
protected SslHandshakeStatus ProcessServerHelloDone(HandshakeMessage message)
{
if (m_State != HandshakeType.Certificate && m_State != HandshakeType.ServerKeyExchange && m_State != HandshakeType.CertificateRequest)
{
throw new SslException(AlertDescription.UnexpectedMessage, "ServerHello message must be preceded by a ClientHello message.");
}
if (message.fragment.Length != 0)
{
throw new SslException(AlertDescription.IllegalParameter, "The ServerHelloDone message is invalid.");
}
UpdateHashes(message, HashUpdate.All); // input message
MemoryStream ms = new MemoryStream();
HandshakeMessage hm = new HandshakeMessage(HandshakeType.ClientKeyExchange, null);
byte[] buffer;
// send Certificate [optional]
if (m_MutualAuthentication)
{
hm.type = HandshakeType.Certificate;
hm.fragment = GetCertificateBytes(m_Options.Certificate);
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.All); // output message
}
// send ClientKeyExchange
if (m_KeyCipher == null)
{
m_KeyCipher = (RSACryptoServiceProvider)m_RemoteCertificate.PublicKey;
}
RSAKeyTransform kf = new RSAKeyTransform(m_KeyCipher);
byte[] preMasterSecret = new byte[48];
m_RNG.GetBytes(preMasterSecret);
ProtocolVersion pv = CompatibilityLayer.GetMaxProtocol(m_Options.Protocol);
preMasterSecret[0] = pv.major;
preMasterSecret[1] = pv.minor;
buffer = kf.CreateKeyExchange(preMasterSecret); // public-key-encrypt the preMasterSecret
hm.type = HandshakeType.ClientKeyExchange;
if (GetProtocol() == SecureProtocol.Ssl3) // SSL
{
hm.fragment = buffer;
}
else // TLS
{
hm.fragment = new byte[buffer.Length + 2];
Array.Copy(buffer, 0, hm.fragment, 2, buffer.Length);
hm.fragment[0] = (byte)(buffer.Length / 256); // prepend the length of the preMasterSecret
hm.fragment[1] = (byte)(buffer.Length % 256);
}
GenerateCiphers(preMasterSecret); // generate the local ciphers
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.All); // output message
m_KeyCipher.Clear();
m_KeyCipher = null;
// send CertificateVerify [optional]
if (m_MutualAuthentication && m_Options.Certificate != null)
{
m_CertSignHash.MasterKey = this.m_MasterSecret;
m_CertSignHash.TransformFinalBlock(buffer, 0, 0); // finalize hash
buffer = m_CertSignHash.CreateSignature(m_Options.Certificate);
hm.type = HandshakeType.CertificateVerify;
hm.fragment = new byte[buffer.Length + 2];
hm.fragment[0] = (byte)(buffer.Length / 256);
hm.fragment[1] = (byte)(buffer.Length % 256);
Array.Copy(buffer, 0, hm.fragment, 2, buffer.Length);
buffer = m_RecordLayer.EncryptBytes(hm.ToBytes(), 0, hm.fragment.Length + 4, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
UpdateHashes(hm, HashUpdate.LocalRemote); // output message
}
// send ChangeCipherSpec
buffer = m_RecordLayer.EncryptBytes(new byte[] { 1 }, 0, 1, ContentType.ChangeCipherSpec);
ms.Write(buffer, 0, buffer.Length);
m_RecordLayer.ChangeLocalState(null, m_CipherSuite.Encryptor, m_CipherSuite.LocalHasher);
// send Finished
buffer = GetFinishedMessage();
UpdateHashes(buffer, HashUpdate.Remote); // output message
buffer = m_RecordLayer.EncryptBytes(buffer, 0, buffer.Length, ContentType.Handshake);
ms.Write(buffer, 0, buffer.Length);
// send empty record [http://www.openssl.org/~bodo/tls-cbc.txt]
if (this.m_CipherSuite.Encryptor.OutputBlockSize != 1) // is bulk cipher?
{
if (((int)m_Options.Flags & (int)SecurityFlags.DontSendEmptyRecord) == 0)
{
byte[] empty = m_RecordLayer.EncryptBytes(new byte[0], 0, 0, ContentType.ApplicationData);
ms.Write(empty, 0, empty.Length);
}
}
// finalize
buffer = ms.ToArray();
ms.Close();
return(new SslHandshakeStatus(SslStatus.ContinueNeeded, buffer));
}