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SMB2Client: Updated encryption and signing logic to support SMB 3.1.1

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This commit is contained in:
Tal Aloni 2024-08-03 12:57:34 +03:00
parent fdc8234429
commit 18459859c7
1 changed files with 39 additions and 4 deletions
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43
SMBLibrary/Client/SMB2Client.cs
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@ -56,6 +56,7 @@ namespace SMBLibrary.Client
private ulong m_sessionID;
private byte[] m_securityBlob;
private byte[] m_sessionKey;
private byte[] m_preauthIntegrityHashValue; // SMB 3.1.1
private ushort m_availableCredits = 1;
public SMB2Client()
@ -203,7 +204,14 @@ namespace SMBLibrary.Client
request.Dialects.Add(SMB2Dialect.SMB202);
request.Dialects.Add(SMB2Dialect.SMB210);
request.Dialects.Add(SMB2Dialect.SMB300);
#if SMB302_CLIENT
request.Dialects.Add(SMB2Dialect.SMB302);
#endif
#if SMB311_CLIENT
request.Dialects.Add(SMB2Dialect.SMB311);
request.NegotiateContextList = GetNegotiateContextList();
m_preauthIntegrityHashValue = new byte[64];
#endif
TrySendCommand(request);
NegotiateResponse response = WaitForCommand(request.MessageID) as NegotiateResponse;
if (response != null && response.Header.Status == NTStatus.STATUS_SUCCESS)
@ -280,14 +288,14 @@ namespace SMBLibrary.Client
}
else
{
m_signingKey = SMB2Cryptography.GenerateSigningKey(m_sessionKey, m_dialect, null);
m_signingKey = SMB2Cryptography.GenerateSigningKey(m_sessionKey, m_dialect, m_preauthIntegrityHashValue);
}
if (m_dialect >= SMB2Dialect.SMB300)
{
m_encryptSessionData = (sessionFlags & SessionFlags.EncryptData) > 0;
m_encryptionKey = SMB2Cryptography.GenerateClientEncryptionKey(m_sessionKey, m_dialect, null);
m_decryptionKey = SMB2Cryptography.GenerateClientDecryptionKey(m_sessionKey, m_dialect, null);
m_encryptionKey = SMB2Cryptography.GenerateClientEncryptionKey(m_sessionKey, m_dialect, m_preauthIntegrityHashValue);
m_decryptionKey = SMB2Cryptography.GenerateClientDecryptionKey(m_sessionKey, m_dialect, m_preauthIntegrityHashValue);
}
}
return response.Header.Status;
@ -488,6 +496,11 @@ namespace SMBLibrary.Client
return;
}
if (m_preauthIntegrityHashValue != null && (command is NegotiateResponse || (command is SessionSetupResponse sessionSetupResponse && sessionSetupResponse.Header.Status == NTStatus.STATUS_MORE_PROCESSING_REQUIRED)))
{
m_preauthIntegrityHashValue = SMB2Cryptography.ComputeHash(HashAlgorithm.SHA512, ByteUtils.Concatenate(m_preauthIntegrityHashValue, messageBytes));
}
m_availableCredits += command.Header.Credits;
if (m_transport == SMBTransportType.DirectTCPTransport && command is NegotiateResponse)
@ -657,6 +670,24 @@ namespace SMBLibrary.Client
}
}
/// <remarks>SMB 3.1.1 only</remarks>
private List<NegotiateContext> GetNegotiateContextList()
{
PreAuthIntegrityCapabilities preAuthIntegrityCapabilities = new PreAuthIntegrityCapabilities();
preAuthIntegrityCapabilities.HashAlgorithms.Add(HashAlgorithm.SHA512);
preAuthIntegrityCapabilities.Salt = new byte[32];
new Random().NextBytes(preAuthIntegrityCapabilities.Salt);
EncryptionCapabilities encryptionCapabilities = new EncryptionCapabilities();
encryptionCapabilities.Ciphers.Add(CipherAlgorithm.Aes128Ccm);
return new List<NegotiateContext>()
{
new NegotiateContext(preAuthIntegrityCapabilities),
new NegotiateContext(encryptionCapabilities)
};
}
public uint MaxTransactSize
{
get
@ -700,6 +731,10 @@ namespace SMBLibrary.Client
else
{
packet.Trailer = request.GetBytes();
if (m_preauthIntegrityHashValue != null && (request is NegotiateRequest || request is SessionSetupRequest))
{
m_preauthIntegrityHashValue = SMB2Cryptography.ComputeHash(HashAlgorithm.SHA512, ByteUtils.Concatenate(m_preauthIntegrityHashValue, packet.Trailer));
}
}
TrySendPacket(socket, packet);
}