internal static SMB2Command GetNegotiateResponse(NegotiateRequest request, GSSProvider securityProvider, ConnectionState state, Guid serverGuid, DateTime serverStartTime)
{
NegotiateResponse response = new NegotiateResponse();
if (request.Dialects.Contains(SMB2Dialect.SMB210))
{
state.Dialect = SMBDialect.SMB210;
response.DialectRevision = SMB2Dialect.SMB210;
}
else if (request.Dialects.Contains(SMB2Dialect.SMB202))
{
state.Dialect = SMBDialect.SMB202;
response.DialectRevision = SMB2Dialect.SMB202;
}
else
{
return(new ErrorResponse(request.CommandName, NTStatus.STATUS_NOT_SUPPORTED));
}
response.SecurityMode = SecurityMode.SigningEnabled;
response.ServerGuid = serverGuid;
response.MaxTransactSize = 65536;
response.MaxReadSize = 65536;
response.MaxWriteSize = 65536;
response.SystemTime = DateTime.Now;
response.ServerStartTime = serverStartTime;
response.SecurityBuffer = securityProvider.GetSPNEGOTokenInitBytes();
return(response);
}
// Special case - SMB2 client initially connecting using SMB1
internal static SMB2Command GetNegotiateResponse(List <string> smb2Dialects, GSSProvider securityProvider, ConnectionState state, Guid serverGuid, DateTime serverStartTime)
{
NegotiateResponse response = new NegotiateResponse();
response.Header.Credits = 1;
if (smb2Dialects.Contains(SMB2xxxDialect))
{
response.DialectRevision = SMB2Dialect.SMB2xx;
}
else if (smb2Dialects.Contains(SMB2002Dialect))
{
state.Dialect = SMBDialect.SMB202;
response.DialectRevision = SMB2Dialect.SMB202;
}
else
{
throw new ArgumentException("SMB2 dialect is not present");
}
response.SecurityMode = SecurityMode.SigningEnabled;
response.ServerGuid = serverGuid;
response.MaxTransactSize = 65536;
response.MaxReadSize = 65536;
response.MaxWriteSize = 65536;
response.SystemTime = DateTime.Now;
response.ServerStartTime = serverStartTime;
response.SecurityBuffer = securityProvider.GetSPNEGOTokenInitBytes();
return(response);
}
internal static SMB2Command GetNegotiateResponse(NegotiateRequest request, GSSProvider securityProvider, ConnectionState state, SMBTransportType transportType, Guid serverGuid, DateTime serverStartTime, bool enableSMB3)
{
NegotiateResponse response = new NegotiateResponse();
if (enableSMB3 && request.Dialects.Contains(SMB2Dialect.SMB300))
{
state.Dialect = SMBDialect.SMB300;
response.DialectRevision = SMB2Dialect.SMB300;
}
else if (request.Dialects.Contains(SMB2Dialect.SMB210))
{
state.Dialect = SMBDialect.SMB210;
response.DialectRevision = SMB2Dialect.SMB210;
}
else if (request.Dialects.Contains(SMB2Dialect.SMB202))
{
state.Dialect = SMBDialect.SMB202;
response.DialectRevision = SMB2Dialect.SMB202;
}
else
{
state.LogToServer(Severity.Verbose, "Negotiate failure: None of the requested SMB2 dialects is supported");
return(new ErrorResponse(request.CommandName, NTStatus.STATUS_NOT_SUPPORTED));
}
response.SecurityMode = SecurityMode.SigningEnabled;
response.ServerGuid = serverGuid;
if (state.Dialect != SMBDialect.SMB202 && transportType == SMBTransportType.DirectTCPTransport)
{
response.Capabilities = Capabilities.LargeMTU;
response.MaxTransactSize = ServerMaxTransactSizeLargeMTU;
response.MaxReadSize = ServerMaxReadSizeLargeMTU;
response.MaxWriteSize = ServerMaxWriteSizeLargeMTU;
// [MS-SMB2] 3.3.5.2 Receiving Any Message - If the length of the message exceeds Connection.MaxTransactSize + 256, the server MUST disconnect the connection.
int maxPacketSize = SessionPacket.HeaderLength + (int)ServerMaxTransactSizeLargeMTU + 256;
if (maxPacketSize > state.ReceiveBuffer.Buffer.Length)
{
state.ReceiveBuffer.IncreaseBufferSize(maxPacketSize);
}
}
else
{
response.MaxTransactSize = ServerMaxTransactSize;
response.MaxReadSize = ServerMaxReadSize;
response.MaxWriteSize = ServerMaxWriteSize;
}
response.SystemTime = DateTime.Now;
response.ServerStartTime = serverStartTime;
response.SecurityBuffer = securityProvider.GetSPNEGOTokenInitBytes();
return(response);
}
// Special case - SMB2 client initially connecting using SMB1
internal static SMB2Command GetNegotiateResponse(List <string> smb2Dialects, GSSProvider securityProvider, ConnectionState state, SMBTransportType transportType, Guid serverGuid, DateTime serverStartTime)
{
NegotiateResponse response = new NegotiateResponse();
response.Header.Credits = 1;
if (smb2Dialects.Contains(SMB2xxxDialect))
{
response.DialectRevision = SMB2Dialect.SMB2xx;
}
else if (smb2Dialects.Contains(SMB2002Dialect))
{
state.Dialect = SMBDialect.SMB202;
response.DialectRevision = SMB2Dialect.SMB202;
}
else
{
throw new ArgumentException("SMB2 dialect is not present");
}
response.SecurityMode = SecurityMode.SigningEnabled;
response.ServerGuid = serverGuid;
if (state.Dialect != SMBDialect.SMB202 && transportType == SMBTransportType.DirectTCPTransport)
{
response.Capabilities = Capabilities.LargeMTU;
response.MaxTransactSize = ServerMaxTransactSizeLargeMTU;
response.MaxReadSize = ServerMaxReadSizeLargeMTU;
response.MaxWriteSize = ServerMaxWriteSizeLargeMTU;
// [MS-SMB2] 3.3.5.2 Receiving Any Message - If the length of the message exceeds Connection.MaxTransactSize + 256, the server MUST disconnect the connection.
int maxPacketSize = SessionPacket.HeaderLength + (int)ServerMaxTransactSizeLargeMTU + 256;
if (maxPacketSize > state.ReceiveBuffer.Buffer.Length)
{
state.ReceiveBuffer.IncreaseBufferSize(maxPacketSize);
}
}
else
{
response.MaxTransactSize = ServerMaxTransactSize;
response.MaxReadSize = ServerMaxReadSize;
response.MaxWriteSize = ServerMaxWriteSize;
}
response.SystemTime = DateTime.Now;
response.ServerStartTime = serverStartTime;
response.SecurityBuffer = securityProvider.GetSPNEGOTokenInitBytes();
return(response);
}
