public void TestEncryption()
{
byte[] encryptionKey = new byte[] { 0x26, 0x1B, 0x72, 0x35, 0x05, 0x58, 0xF2, 0xE9, 0xDC, 0xF6, 0x13, 0x07, 0x03, 0x83, 0xED, 0xBF };
byte[] nonce = new byte[] { 0x66, 0xE6, 0x9A, 0x11, 0x18, 0x92, 0x58, 0x4F, 0xB5, 0xED, 0x52 };
ulong sessionID = 0x8e40014000011;
byte[] message = new byte[] { 0xFE, 0x53, 0x4D, 0x42, 0x40, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x00, 0x40, 0x00,
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFE, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x14, 0x00, 0xE4, 0x08, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x31, 0x00, 0x70, 0x00, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x15, 0x01, 0x00, 0x00, 0x39, 0x00, 0x00, 0x02, 0x01, 0x00, 0x00, 0x00, 0x39, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x53, 0x6D, 0x62, 0x33, 0x20, 0x65, 0x6E, 0x63, 0x72, 0x79, 0x70, 0x74, 0x69, 0x6F, 0x6E, 0x20,
0x74, 0x65, 0x73, 0x74, 0x69, 0x6E, 0x67 };
byte[] expectedEncrypted = new byte[] { 0x25, 0xC8, 0xFE, 0xE1, 0x66, 0x05, 0xA4, 0x37, 0x83, 0x2D, 0x1C, 0xD5, 0x2D, 0xA9, 0xF4, 0x64,
0x53, 0x33, 0x48, 0x2A, 0x17, 0x5F, 0xE5, 0x38, 0x45, 0x63, 0xF4, 0x5F, 0xCD, 0xAF, 0xAE, 0xF3,
0x8B, 0xC6, 0x2B, 0xA4, 0xD5, 0xC6, 0x28, 0x97, 0x99, 0x66, 0x25, 0xA4, 0x4C, 0x29, 0xBE, 0x56,
0x58, 0xDE, 0x2E, 0x61, 0x17, 0x58, 0x57, 0x79, 0xE7, 0xB5, 0x9F, 0xFD, 0x97, 0x12, 0x78, 0xD0,
0x85, 0x80, 0xD7, 0xFA, 0x89, 0x9E, 0x41, 0x0E, 0x91, 0x0E, 0xAB, 0xF5, 0xAA, 0x1D, 0xB4, 0x30,
0x50, 0xB3, 0x3B, 0x49, 0x18, 0x26, 0x37, 0x75, 0x9A, 0xC1, 0x5D, 0x84, 0xBF, 0xCD, 0xF5, 0xB6,
0xB2, 0x38, 0x99, 0x3C, 0x0F, 0x4C, 0xF4, 0xD6, 0x01, 0x20, 0x23, 0xF6, 0xC6, 0x27, 0x29, 0x70,
0x75, 0xD8, 0x4B, 0x78, 0x03, 0x91, 0x2D, 0x0A, 0x96, 0x39, 0x63, 0x44, 0x53, 0x59, 0x5E, 0xF3,
0xE3, 0x3F, 0xFE, 0x4E, 0x7A, 0xC2, 0xAB };
byte[] expectedSignature = new byte[] { 0x81, 0xA2, 0x86, 0x53, 0x54, 0x15, 0x44, 0x5D, 0xAE, 0x39, 0x39, 0x21, 0xE4, 0x4F, 0xA4, 0x2E };
byte[] signature;
byte[] encryptedMessage = SMB2Cryptography.EncryptMessage(encryptionKey, nonce, message, sessionID, out signature);
Assert.True(ByteUtils.AreByteArraysEqual(expectedEncrypted, encryptedMessage));
// The associated data in this sample include non-zero nonce padding so we ignore signature validation
}
public void TestDecryption()
{
byte[] decryptionKey = new byte[] { 0x8F, 0xE2, 0xB5, 0x7E, 0xC3, 0x4D, 0x2D, 0xB5, 0xB1, 0xA9, 0x72, 0x7F, 0x52, 0x6B, 0xBD, 0xB5 };
byte[] transformedPacket = new byte[] { 0xFD, 0x53, 0x4D, 0x42, 0xA6, 0x01, 0x55, 0x30, 0xA1, 0x8F, 0x6D, 0x9A, 0xFF, 0xE2, 0x2A, 0xFA,
0xE8, 0xE6, 0x64, 0x84, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x14,
0x00, 0xE4, 0x08, 0x00, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x11, 0x00, 0x00, 0x14,
0x00, 0xE4, 0x08, 0x00, 0xDB, 0xF4, 0x64, 0x35, 0xC5, 0xF1, 0x41, 0x69, 0x29, 0x3C, 0xE0, 0x79,
0xE3, 0x44, 0x47, 0x9B, 0xF6, 0x70, 0x22, 0x7E, 0x49, 0x87, 0x3F, 0x45, 0x86, 0x72, 0xC3, 0x09,
0x8D, 0xAC, 0x46, 0x7D, 0xD5, 0x80, 0x9F, 0x36, 0x9D, 0x67, 0x40, 0x91, 0x66, 0x51, 0x57, 0x87,
0x14, 0x83, 0xE0, 0x1F, 0x7B, 0xEC, 0xD0, 0x20, 0x64, 0xEA, 0xC3, 0xE2, 0x35, 0xF9, 0x13, 0x66,
0x8B, 0xBC, 0x2F, 0x09, 0x79, 0x80, 0xD4, 0xB3, 0x78, 0xF1, 0x99, 0x3E, 0xFF, 0x6E, 0x60, 0xD1,
0x77, 0x30, 0x9E, 0x5B };
byte[] expectedDecryptedMessage = new byte[] { 0xFE, 0x53, 0x4D, 0x42, 0x40, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x00, 0x21, 0x00,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFE, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x14, 0x00, 0xE4, 0x08, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x11, 0x00, 0x00, 0x00, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
SMB2TransformHeader transformHeader = new SMB2TransformHeader(transformedPacket, 0);
byte[] encryptedMessage = ByteReader.ReadBytes(transformedPacket, SMB2TransformHeader.Length, (int)transformHeader.OriginalMessageSize);
byte[] decryptedMessage = SMB2Cryptography.DecryptMessage(decryptionKey, transformHeader, encryptedMessage);
Assert.True(ByteUtils.AreByteArraysEqual(expectedDecryptedMessage, decryptedMessage));
}
public NTStatus Login(string domainName, string userName, string password, AuthenticationMethod authenticationMethod)
{
if (!m_isConnected)
{
throw new InvalidOperationException("A connection must be successfully established before attempting login");
}
byte[] negotiateMessage = NTLMAuthenticationHelper.GetNegotiateMessage(m_securityBlob, domainName, authenticationMethod);
if (negotiateMessage == null)
{
return(NTStatus.SEC_E_INVALID_TOKEN);
}
SessionSetupRequest request = new SessionSetupRequest();
request.SecurityMode = SecurityMode.SigningEnabled;
request.SecurityBuffer = negotiateMessage;
TrySendCommand(request);
SMB2Command response = WaitForCommand(SMB2CommandName.SessionSetup);
if (response != null)
{
if (response.Header.Status == NTStatus.STATUS_MORE_PROCESSING_REQUIRED && response is SessionSetupResponse)
{
byte[] authenticateMessage = NTLMAuthenticationHelper.GetAuthenticateMessage(((SessionSetupResponse)response).SecurityBuffer, domainName, userName, password, authenticationMethod, out m_sessionKey);
if (authenticateMessage == null)
{
return(NTStatus.SEC_E_INVALID_TOKEN);
}
m_sessionID = response.Header.SessionID;
request = new SessionSetupRequest();
request.SecurityMode = SecurityMode.SigningEnabled;
request.SecurityBuffer = authenticateMessage;
TrySendCommand(request);
response = WaitForCommand(SMB2CommandName.SessionSetup);
if (response != null)
{
m_isLoggedIn = (response.Header.Status == NTStatus.STATUS_SUCCESS);
if (m_isLoggedIn)
{
m_signingKey = SMB2Cryptography.GenerateSigningKey(m_sessionKey, m_dialect, null);
if (m_dialect == SMB2Dialect.SMB300)
{
m_encryptSessionData = (((SessionSetupResponse)response).SessionFlags & SessionFlags.EncryptData) > 0;
m_encryptionKey = SMB2Cryptography.GenerateClientEncryptionKey(m_sessionKey, SMB2Dialect.SMB300, null);
m_decryptionKey = SMB2Cryptography.GenerateClientDecryptionKey(m_sessionKey, SMB2Dialect.SMB300, null);
}
}
return(response.Header.Status);
}
}
else
{
return(response.Header.Status);
}
}
return(NTStatus.STATUS_INVALID_SMB);
}
public void TestDecryptionKeyGeneration()
{
byte[] sessionKey = new byte[] { 0xB4, 0x54, 0x67, 0x71, 0xB5, 0x15, 0xF7, 0x66, 0xA8, 0x67, 0x35, 0x53, 0x2D, 0xD6, 0xC4, 0xF0 };
byte[] decryptionKey = SMB2Cryptography.GenerateClientDecryptionKey(sessionKey, SMB2Dialect.SMB300, null);
byte[] expectedDecryptionKey = new byte[] { 0x8F, 0xE2, 0xB5, 0x7E, 0xC3, 0x4D, 0x2D, 0xB5, 0xB1, 0xA9, 0x72, 0x7F, 0x52, 0x6B, 0xBD, 0xB5 };
Assert.True(ByteUtils.AreByteArraysEqual(expectedDecryptionKey, decryptionKey));
}
public void TestEncryptionKeyGeneration()
{
byte[] sessionKey = new byte[] { 0xB4, 0x54, 0x67, 0x71, 0xB5, 0x15, 0xF7, 0x66, 0xA8, 0x67, 0x35, 0x53, 0x2D, 0xD6, 0xC4, 0xF0 };
byte[] expectedEncryptionKey = new byte[] { 0x26, 0x1B, 0x72, 0x35, 0x05, 0x58, 0xF2, 0xE9, 0xDC, 0xF6, 0x13, 0x07, 0x03, 0x83, 0xED, 0xBF };
byte[] encryptionKey = SMB2Cryptography.GenerateClientEncryptionKey(sessionKey, SMB2Dialect.SMB300, null);
Assert.True(ByteUtils.AreByteArraysEqual(expectedEncryptionKey, encryptionKey));
}
internal void TrySendCommand(SMB2Command request, bool encryptData)
{
if (m_dialect == SMB2Dialect.SMB202 || m_transport == SMBTransportType.NetBiosOverTCP)
{
request.Header.CreditCharge = 0;
request.Header.Credits = 1;
m_availableCredits -= 1;
}
else
{
if (request.Header.CreditCharge == 0)
{
request.Header.CreditCharge = 1;
}
if (m_availableCredits < request.Header.CreditCharge)
{
throw new Exception("Not enough credits");
}
m_availableCredits -= request.Header.CreditCharge;
if (m_availableCredits < DesiredCredits)
{
request.Header.Credits += (ushort)(DesiredCredits - m_availableCredits);
}
}
request.Header.MessageID = m_messageID;
request.Header.SessionID = m_sessionID;
// [MS-SMB2] If the client encrypts the message [..] then the client MUST set the Signature field of the SMB2 header to zero
if (m_signingRequired && !encryptData)
{
request.Header.IsSigned = (m_sessionID != 0 && ((request.CommandName == SMB2CommandName.TreeConnect || request.Header.TreeID != 0) ||
(m_dialect == SMB2Dialect.SMB300 && request.CommandName == SMB2CommandName.Logoff)));
if (request.Header.IsSigned)
{
request.Header.Signature = new byte[16]; // Request could be reused
byte[] buffer = request.GetBytes();
byte[] signature = SMB2Cryptography.CalculateSignature(m_signingKey, m_dialect, buffer, 0, buffer.Length);
// [MS-SMB2] The first 16 bytes of the hash MUST be copied into the 16-byte signature field of the SMB2 Header.
request.Header.Signature = ByteReader.ReadBytes(signature, 0, 16);
}
}
TrySendCommand(m_clientSocket, request, encryptData ? m_encryptionKey : null);
if (m_dialect == SMB2Dialect.SMB202 || m_transport == SMBTransportType.NetBiosOverTCP)
{
m_messageID++;
}
else
{
m_messageID += request.Header.CreditCharge;
}
}
public static void TrySendCommand(Socket socket, SMB2Command request, byte[] encryptionKey)
{
SessionMessagePacket packet = new SessionMessagePacket();
if (encryptionKey != null)
{
byte[] requestBytes = request.GetBytes();
packet.Trailer = SMB2Cryptography.TransformMessage(encryptionKey, requestBytes, request.Header.SessionID);
}
else
{
packet.Trailer = request.GetBytes();
}
TrySendPacket(socket, packet);
}
public void TestSMB210SignatureCalculation()
{
byte[] exportedSessionKey = new byte[] { 0x04, 0xE7, 0x07, 0x57, 0x1F, 0x8E, 0x03, 0x53, 0xB7, 0x7A, 0x94, 0xC3, 0x65, 0x3B, 0x87, 0xB5 };
byte[] message = new byte[] { 0xfe, 0x53, 0x4d, 0x42, 0x40, 0x00, 0x01, 0x00, 0x28, 0x01, 0x00, 0xc0, 0x0b, 0x00, 0x07, 0x00,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xfe, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00,
0xa1, 0x64, 0xff, 0xe5, 0x3d, 0x68, 0x11, 0x98, 0x1f, 0x38, 0x67, 0x72, 0xe3, 0x87, 0xe0, 0x6f,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff };
ByteWriter.WriteBytes(message, 48, new byte[16]);
byte[] signature = SMB2Cryptography.CalculateSignature(exportedSessionKey, SMB2Dialect.SMB210, message, 0, message.Length);
signature = ByteReader.ReadBytes(signature, 0, 16);
byte[] expected = new byte[] { 0xa1, 0x64, 0xff, 0xe5, 0x3d, 0x68, 0x11, 0x98, 0x1f, 0x38, 0x67, 0x72, 0xe3, 0x87, 0xe0, 0x6f };
Assert.True(ByteUtils.AreByteArraysEqual(signature, expected));
}
public void TestSMB202SignatureCalculation()
{
byte[] exportedSessionKey = new byte[] { 0xD3, 0x83, 0x54, 0xCC, 0x37, 0x43, 0x39, 0xF0, 0x52, 0x4F, 0x78, 0x91, 0x46, 0x78, 0x99, 0x21 };
byte[] message = new byte[] { 0xfe, 0x53, 0x4d, 0x42, 0x40, 0x00, 0x01, 0x00, 0x28, 0x01, 0x00, 0xc0, 0x0b, 0x00, 0x07, 0x00,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xfe, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00,
0xfb, 0xd2, 0x84, 0x34, 0x03, 0x24, 0xc6, 0x2f, 0xbe, 0xbb, 0x65, 0xdd, 0x10, 0x51, 0xf3, 0xae,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff };
ByteWriter.WriteBytes(message, 48, new byte[16]);
byte[] signature = SMB2Cryptography.CalculateSignature(exportedSessionKey, SMB2Dialect.SMB202, message, 0, message.Length);
signature = ByteReader.ReadBytes(signature, 0, 16);
byte[] expected = new byte[] { 0xfb, 0xd2, 0x84, 0x34, 0x03, 0x24, 0xc6, 0x2f, 0xbe, 0xbb, 0x65, 0xdd, 0x10, 0x51, 0xf3, 0xae };
Assert.True(ByteUtils.AreByteArraysEqual(signature, expected));
}
public void TestSMB300SignatureCalculation()
{
byte[] exportedSessionKey = new byte[] { 0x35, 0x40, 0x24, 0xCB, 0xCA, 0x4F, 0x94, 0xAA, 0x51, 0xD4, 0x03, 0x3E, 0x6E, 0x9B, 0x2F, 0x98 };
byte[] signingKey = SMB2Cryptography.GenerateSigningKey(exportedSessionKey, SMB2Dialect.SMB300, null);
byte[] message = new byte[] { 0xFE, 0x53, 0x4D, 0x42, 0x40, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4D, 0x00, 0x00, 0x20, 0x00, 0x70, 0x00, 0x00,
0x73, 0xF2, 0xCC, 0x56, 0x09, 0x3E, 0xD2, 0xB5, 0xD7, 0x10, 0x66, 0x6C, 0xE4, 0x28, 0x2D, 0xD1,
0x09, 0x00, 0x00, 0x00, 0x48, 0x00, 0x09, 0x00, 0xA1, 0x07, 0x30, 0x05, 0xA0, 0x03, 0x0A, 0x01, 0x00 };
ByteWriter.WriteBytes(message, 48, new byte[16]);
byte[] signature = SMB2Cryptography.CalculateSignature(signingKey, SMB2Dialect.SMB300, message, 0, message.Length);
signature = ByteReader.ReadBytes(signature, 0, 16);
byte[] expected = new byte[] { 0x73, 0xF2, 0xCC, 0x56, 0x09, 0x3E, 0xD2, 0xB5, 0xD7, 0x10, 0x66, 0x6C, 0xE4, 0x28, 0x2D, 0xD1 };
Assert.True(ByteUtils.AreByteArraysEqual(signature, expected));
}
internal static SMB2Command GetSessionSetupResponse(SessionSetupRequest request, GSSProvider securityProvider, SMB2ConnectionState state)
{
// [MS-SMB2] Windows [..] will also accept raw Kerberos messages and implicit NTLM messages as part of GSS authentication.
SessionSetupResponse response = new SessionSetupResponse();
byte[] outputToken;
NTStatus status = securityProvider.AcceptSecurityContext(ref state.AuthenticationContext, request.SecurityBuffer, out outputToken);
if (status != NTStatus.STATUS_SUCCESS && status != NTStatus.SEC_I_CONTINUE_NEEDED)
{
string userName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.UserName) as string;
string domainName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.DomainName) as string;
string machineName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.MachineName) as string;
string osVersion = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.OSVersion) as string;
state.LogToServer(Severity.Information, "Session Setup: User '{0}' failed authentication (Domain: '{1}', Workstation: '{2}', OS version: '{3}'), NTStatus: {4}", userName, domainName, machineName, osVersion, status);
return(new ErrorResponse(request.CommandName, status));
}
if (outputToken != null)
{
response.SecurityBuffer = outputToken;
}
// According to [MS-SMB2] 3.3.5.5.3, response.Header.SessionID must be allocated if the server returns STATUS_MORE_PROCESSING_REQUIRED
if (request.Header.SessionID == 0)
{
ulong?sessionID = state.AllocateSessionID();
if (!sessionID.HasValue)
{
return(new ErrorResponse(request.CommandName, NTStatus.STATUS_TOO_MANY_SESSIONS));
}
response.Header.SessionID = sessionID.Value;
}
if (status == NTStatus.SEC_I_CONTINUE_NEEDED)
{
response.Header.Status = NTStatus.STATUS_MORE_PROCESSING_REQUIRED;
}
else // status == STATUS_SUCCESS
{
string userName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.UserName) as string;
string domainName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.DomainName) as string;
string machineName = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.MachineName) as string;
string osVersion = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.OSVersion) as string;
byte[] sessionKey = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.SessionKey) as byte[];
object accessToken = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.AccessToken);
bool? isGuest = securityProvider.GetContextAttribute(state.AuthenticationContext, GSSAttributeName.IsGuest) as bool?;
if (!isGuest.HasValue || !isGuest.Value)
{
state.LogToServer(Severity.Information, "Session Setup: User '{0}' authenticated successfully (Domain: '{1}', Workstation: '{2}', OS version: '{3}').", userName, domainName, machineName, osVersion);
bool signingRequired = (request.SecurityMode & SecurityMode.SigningRequired) > 0;
SMB2Dialect smb2Dialect = SMBServer.ToSMB2Dialect(state.Dialect);
byte[] signingKey = SMB2Cryptography.GenerateSigningKey(sessionKey, smb2Dialect, null);
state.CreateSession(request.Header.SessionID, userName, machineName, sessionKey, accessToken, signingRequired, signingKey);
}
else
{
state.LogToServer(Severity.Information, "Session Setup: User '{0}' failed authentication (Domain: '{1}', Workstation: '{2}', OS version: '{3}'), logged in as guest.", userName, domainName, machineName, osVersion);
state.CreateSession(request.Header.SessionID, "Guest", machineName, sessionKey, accessToken, false, null);
response.SessionFlags = SessionFlags.IsGuest;
}
}
return(response);
}
private void ProcessPacket(SessionPacket packet, ConnectionState state)
{
if (packet is SessionMessagePacket)
{
byte[] messageBytes;
if (m_dialect == SMB2Dialect.SMB300 && SMB2TransformHeader.IsTransformHeader(packet.Trailer, 0))
{
SMB2TransformHeader transformHeader = new SMB2TransformHeader(packet.Trailer, 0);
byte[] encryptedMessage = ByteReader.ReadBytes(packet.Trailer, SMB2TransformHeader.Length, (int)transformHeader.OriginalMessageSize);
messageBytes = SMB2Cryptography.DecryptMessage(m_decryptionKey, transformHeader, encryptedMessage);
}
else
{
messageBytes = packet.Trailer;
}
SMB2Command command;
try
{
command = SMB2Command.ReadResponse(messageBytes, 0);
}
catch (Exception ex)
{
Log("Invalid SMB2 response: " + ex.Message);
state.ClientSocket.Close();
m_isConnected = false;
return;
}
m_availableCredits += command.Header.Credits;
if (m_transport == SMBTransportType.DirectTCPTransport && command is NegotiateResponse)
{
NegotiateResponse negotiateResponse = (NegotiateResponse)command;
if ((negotiateResponse.Capabilities & Capabilities.LargeMTU) > 0)
{
// [MS-SMB2] 3.2.5.1 Receiving Any Message - If the message size received exceeds Connection.MaxTransactSize, the client MUST disconnect the connection.
// Note: Windows clients do not enforce the MaxTransactSize value, we add 256 bytes.
int maxPacketSize = SessionPacket.HeaderLength + (int)Math.Min(negotiateResponse.MaxTransactSize, ClientMaxTransactSize) + 256;
if (maxPacketSize > state.ReceiveBuffer.Buffer.Length)
{
state.ReceiveBuffer.IncreaseBufferSize(maxPacketSize);
}
}
}
// [MS-SMB2] 3.2.5.1.2 - If the MessageId is 0xFFFFFFFFFFFFFFFF, this is not a reply to a previous request,
// and the client MUST NOT attempt to locate the request, but instead process it as follows:
// If the command field in the SMB2 header is SMB2 OPLOCK_BREAK, it MUST be processed as specified in 3.2.5.19.
// Otherwise, the response MUST be discarded as invalid.
if (command.Header.MessageID != 0xFFFFFFFFFFFFFFFF || command.Header.Command == SMB2CommandName.OplockBreak)
{
lock (m_incomingQueueLock)
{
m_incomingQueue.Add(command);
m_incomingQueueEventHandle.Set();
}
}
}
else if ((packet is PositiveSessionResponsePacket || packet is NegativeSessionResponsePacket) && m_transport == SMBTransportType.NetBiosOverTCP)
{
m_sessionResponsePacket = packet;
m_sessionResponseEventHandle.Set();
}
else if (packet is SessionKeepAlivePacket && m_transport == SMBTransportType.NetBiosOverTCP)
{
// [RFC 1001] NetBIOS session keep alives do not require a response from the NetBIOS peer
}
else
{
Log("Inappropriate NetBIOS session packet");
state.ClientSocket.Close();
}
}
