/* Copyright (C) 2014-2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
*
* You can redistribute this program and/or modify it under the terms of
* the GNU Lesser Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*/
using System;
using System.Collections.Generic;
using SMBLibrary.NetBios;
using SMBLibrary.Server.SMB1;
using SMBLibrary.SMB1;
using Utilities;
namespace SMBLibrary.Server
{
public partial class SMBServer
{
private void ProcessSMB1Message(SMB1Message message, ref ConnectionState state)
{
SMB1Header header = new SMB1Header();
PrepareResponseHeader(header, message.Header);
List<SMB1Command> sendQueue = new List<SMB1Command>();
bool isBatchedRequest = (message.Commands.Count > 1);
foreach (SMB1Command command in message.Commands)
{
List<SMB1Command> responses = ProcessSMB1Command(header, command, ref state);
sendQueue.AddRange(responses);
if (header.Status != NTStatus.STATUS_SUCCESS)
{
break;
}
}
if (isBatchedRequest)
{
if (sendQueue.Count > 0)
{
// The server MUST batch the response into an AndX Response chain.
SMB1Message reply = new SMB1Message();
reply.Header = header;
for (int index = 0; index < sendQueue.Count; index++)
{
if (sendQueue[index] is SMBAndXCommand || index == sendQueue.Count - 1)
{
reply.Commands.Add(sendQueue[index]);
sendQueue.RemoveAt(index);
index--;
}
}
EnqueueMessage(state, reply);
}
}
foreach (SMB1Command response in sendQueue)
{
SMB1Message reply = new SMB1Message();
reply.Header = header;
reply.Commands.Add(response);
EnqueueMessage(state, reply);
}
}
/// <summary>
/// May return an empty list
/// </summary>
private List<SMB1Command> ProcessSMB1Command(SMB1Header header, SMB1Command command, ref ConnectionState state)
{
if (state.Dialect == SMBDialect.NotSet)
{
if (command is NegotiateRequest)
{
NegotiateRequest request = (NegotiateRequest)command;
if (request.Dialects.Contains(SMBServer.NTLanManagerDialect))
{
state = new SMB1ConnectionState(state);
state.Dialect = SMBDialect.NTLM012;
m_connectionManager.AddConnection(state);
if (EnableExtendedSecurity && header.ExtendedSecurityFlag)
{
return NegotiateHelper.GetNegotiateResponseExtended(request, m_serverGuid);
}
else
{
return NegotiateHelper.GetNegotiateResponse(header, request, m_securityProvider, state);
}
}
else
{
return new NegotiateResponseNotSupported();
}
}
else
{
// [MS-CIFS] An SMB_COM_NEGOTIATE exchange MUST be completed before any other SMB messages are sent to the server
header.Status = NTStatus.STATUS_INVALID_SMB;
return new ErrorResponse(command.CommandName);
}
}
else if (command is NegotiateRequest)
{
// There MUST be only one SMB_COM_NEGOTIATE exchange per SMB connection.
// Subsequent SMB_COM_NEGOTIATE requests received by the server MUST be rejected with error responses.
header.Status = NTStatus.STATUS_INVALID_SMB;
return new ErrorResponse(command.CommandName);
}
else
{
return ProcessSMB1Command(header, command, (SMB1ConnectionState)state);
}
}
private List<SMB1Command> ProcessSMB1Command(SMB1Header header, SMB1Command command, SMB1ConnectionState state)
{
if (command is SessionSetupAndXRequest)
{
SessionSetupAndXRequest request = (SessionSetupAndXRequest)command;
state.MaxBufferSize = request.MaxBufferSize;
return SessionSetupHelper.GetSessionSetupResponse(header, request, m_securityProvider, state);
}
else if (command is SessionSetupAndXRequestExtended)
{
SessionSetupAndXRequestExtended request = (SessionSetupAndXRequestExtended)command;
state.MaxBufferSize = request.MaxBufferSize;
return SessionSetupHelper.GetSessionSetupResponseExtended(header, request, m_securityProvider, state);
}
else if (command is EchoRequest)
{
return ServerResponseHelper.GetEchoResponse((EchoRequest)command);
}
else
{
SMB1Session session = state.GetSession(header.UID);
if (session == null)
{
header.Status = NTStatus.STATUS_USER_SESSION_DELETED;
return new ErrorResponse(command.CommandName);
}
if (command is TreeConnectAndXRequest)
{
TreeConnectAndXRequest request = (TreeConnectAndXRequest)command;
return TreeConnectHelper.GetTreeConnectResponse(header, request, state, m_services, m_shares);
}
else if (command is LogoffAndXRequest)
{
state.LogToServer(Severity.Information, "Logoff: User '{0}' logged off.", session.UserName);
m_securityProvider.DeleteSecurityContext(ref session.SecurityContext.AuthenticationContext);
state.RemoveSession(header.UID);
return new LogoffAndXResponse();
}
else
{
ISMBShare share = session.GetConnectedTree(header.TID);
if (share == null)
{
header.Status = NTStatus.STATUS_SMB_BAD_TID;
return new ErrorResponse(command.CommandName);
}
if (command is CreateDirectoryRequest)
{
CreateDirectoryRequest request = (CreateDirectoryRequest)command;
return FileStoreResponseHelper.GetCreateDirectoryResponse(header, request, share, state);
}
else if (command is DeleteDirectoryRequest)
{
DeleteDirectoryRequest request = (DeleteDirectoryRequest)command;
return FileStoreResponseHelper.GetDeleteDirectoryResponse(header, request, share, state);
}
else if (command is CloseRequest)
{
CloseRequest request = (CloseRequest)command;
return ServerResponseHelper.GetCloseResponse(header, request, share, state);
}
else if (command is FlushRequest)
{
FlushRequest request = (FlushRequest)command;
return ReadWriteResponseHelper.GetFlushResponse(header, request, share, state);
}
else if (command is DeleteRequest)
{
DeleteRequest request = (DeleteRequest)command;
return FileStoreResponseHelper.GetDeleteResponse(header, request, share, state);
}
else if (command is RenameRequest)
{
RenameRequest request = (RenameRequest)command;
return FileStoreResponseHelper.GetRenameResponse(header, request, share, state);
}
else if (command is QueryInformationRequest)
{
QueryInformationRequest request = (QueryInformationRequest)command;
return FileStoreResponseHelper.GetQueryInformationResponse(header, request, share, state);
}
else if (command is SetInformationRequest)
{
SetInformationRequest request = (SetInformationRequest)command;
return FileStoreResponseHelper.GetSetInformationResponse(header, request, share, state);
}
else if (command is ReadRequest)
{
ReadRequest request = (ReadRequest)command;
return ReadWriteResponseHelper.GetReadResponse(header, request, share, state);
}
else if (command is WriteRequest)
{
WriteRequest request = (WriteRequest)command;
return ReadWriteResponseHelper.GetWriteResponse(header, request, share, state);
}
else if (command is CheckDirectoryRequest)
{
CheckDirectoryRequest request = (CheckDirectoryRequest)command;
return FileStoreResponseHelper.GetCheckDirectoryResponse(header, request, share, state);
}
else if (command is WriteRawRequest)
{
// [MS-CIFS] 3.3.5.26 - Receiving an SMB_COM_WRITE_RAW Request:
// the server MUST verify that the Server.Capabilities include CAP_RAW_MODE,
// If an error is detected [..] the Write Raw operation MUST fail and
// the server MUST return a Final Server Response [..] with the Count field set to zero.
return new WriteRawFinalResponse();
}
else if (command is SetInformation2Request)
{
SetInformation2Request request = (SetInformation2Request)command;
return FileStoreResponseHelper.GetSetInformation2Response(header, request, share, state);
}
else if (command is LockingAndXRequest)
{
header.Status = NTStatus.STATUS_ACCESS_DENIED;
return new ErrorResponse(command.CommandName);
}
else if (command is OpenAndXRequest)
{
OpenAndXRequest request = (OpenAndXRequest)command;
return OpenAndXHelper.GetOpenAndXResponse(header, request, share, state);
}
else if (command is ReadAndXRequest)
{
ReadAndXRequest request = (ReadAndXRequest)command;
return ReadWriteResponseHelper.GetReadResponse(header, request, share, state);
}
else if (command is WriteAndXRequest)
{
WriteAndXRequest request = (WriteAndXRequest)command;
return ReadWriteResponseHelper.GetWriteResponse(header, request, share, state);
}
else if (command is FindClose2Request)
{
return ServerResponseHelper.GetFindClose2Request(header, (FindClose2Request)command, state);
}
else if (command is TreeDisconnectRequest)
{
TreeDisconnectRequest request = (TreeDisconnectRequest)command;
return TreeConnectHelper.GetTreeDisconnectResponse(header, request, share, state);
}
else if (command is TransactionRequest) // Both TransactionRequest and Transaction2Request
{
TransactionRequest request = (TransactionRequest)command;
return TransactionHelper.GetTransactionResponse(header, request, share, state);
}
else if (command is TransactionSecondaryRequest) // Both TransactionSecondaryRequest and Transaction2SecondaryRequest
{
TransactionSecondaryRequest request = (TransactionSecondaryRequest)command;
return TransactionHelper.GetTransactionResponse(header, request, share, state);
}
else if (command is NTTransactRequest)
{
NTTransactRequest request = (NTTransactRequest)command;
return NTTransactHelper.GetNTTransactResponse(header, request, share, state);
}
else if (command is NTTransactSecondaryRequest)
{
NTTransactSecondaryRequest request = (NTTransactSecondaryRequest)command;
return NTTransactHelper.GetNTTransactResponse(header, request, share, state);
}
else if (command is NTCreateAndXRequest)
{
NTCreateAndXRequest request = (NTCreateAndXRequest)command;
return NTCreateHelper.GetNTCreateResponse(header, request, share, state);
}
else if (command is NTCancelRequest)
{
NTCancelRequest request = (NTCancelRequest)command;
CancelHelper.ProcessNTCancelRequest(header, request, share, state);
// [MS-CIFS] The SMB_COM_NT_CANCEL command MUST NOT send a response.
return new List<SMB1Command>();
}
}
}
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
internal static void EnqueueMessage(ConnectionState state, SMB1Message response)
{
SessionMessagePacket packet = new SessionMessagePacket();
packet.Trailer = response.GetBytes();
state.SendQueue.Enqueue(packet);
state.LogToServer(Severity.Verbose, "SMB1 message queued: {0} responses, First response: {1}, Packet length: {2}", response.Commands.Count, response.Commands[0].CommandName.ToString(), packet.Length);
}
private static void PrepareResponseHeader(SMB1Header responseHeader, SMB1Header requestHeader)
{
responseHeader.Status = NTStatus.STATUS_SUCCESS;
responseHeader.Flags = HeaderFlags.CaseInsensitive | HeaderFlags.CanonicalizedPaths | HeaderFlags.Reply;
responseHeader.Flags2 = HeaderFlags2.NTStatusCode;
if ((requestHeader.Flags2 & HeaderFlags2.LongNamesAllowed) > 0)
{
responseHeader.Flags2 |= HeaderFlags2.LongNamesAllowed | HeaderFlags2.LongNameUsed;
}
if ((requestHeader.Flags2 & HeaderFlags2.ExtendedAttributes) > 0)
{
responseHeader.Flags2 |= HeaderFlags2.ExtendedAttributes;
}
if ((requestHeader.Flags2 & HeaderFlags2.ExtendedSecurity) > 0)
{
responseHeader.Flags2 |= HeaderFlags2.ExtendedSecurity;
}
if ((requestHeader.Flags2 & HeaderFlags2.Unicode) > 0)
{
responseHeader.Flags2 |= HeaderFlags2.Unicode;
}
responseHeader.MID = requestHeader.MID;
responseHeader.PID = requestHeader.PID;
responseHeader.UID = requestHeader.UID;
responseHeader.TID = requestHeader.TID;
}
}
}