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));
}
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();
}
}
