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SMBLibrary/SMBLibrary/Server/SMBServer.SMB1.cs

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C#
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/* 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
{
public void ProcessSMB1Message(SMB1Message message, SMB1ConnectionState state)
{
SMB1Message reply = new SMB1Message();
PrepareResponseHeader(reply, message);
List<SMB1Command> sendQueue = new List<SMB1Command>();
foreach (SMB1Command command in message.Commands)
{
SMB1Command response = ProcessSMB1Command(reply.Header, command, state, sendQueue);
if (response != null)
{
reply.Commands.Add(response);
}
if (reply.Header.Status != NTStatus.STATUS_SUCCESS)
{
break;
}
}
if (reply.Commands.Count > 0)
{
TrySendMessage(state, reply);
foreach (SMB1Command command in sendQueue)
{
SMB1Message secondaryReply = new SMB1Message();
secondaryReply.Header = reply.Header;
secondaryReply.Commands.Add(command);
TrySendMessage(state, secondaryReply);
}
}
}
/// <summary>
/// May return null
/// </summary>
public SMB1Command ProcessSMB1Command(SMB1Header header, SMB1Command command, SMB1ConnectionState state, List<SMB1Command> sendQueue)
{
if (command is NegotiateRequest)
{
NegotiateRequest request = (NegotiateRequest)command;
if (request.Dialects.Contains(SMBServer.NTLanManagerDialect))
{
if (EnableExtendedSecurity && header.ExtendedSecurityFlag)
{
return NegotiateHelper.GetNegotiateResponseExtended(request, m_serverGuid);
}
else
{
return NegotiateHelper.GetNegotiateResponse(header, request, m_users);
}
}
else
{
return new NegotiateResponseNotSupported();
}
}
else if (command is SessionSetupAndXRequest)
{
SessionSetupAndXRequest request = (SessionSetupAndXRequest)command;
state.MaxBufferSize = request.MaxBufferSize;
return SessionSetupHelper.GetSessionSetupResponse(header, request, m_users, state);
}
else if (command is SessionSetupAndXRequestExtended)
{
SessionSetupAndXRequestExtended request = (SessionSetupAndXRequestExtended)command;
state.MaxBufferSize = request.MaxBufferSize;
return SessionSetupHelper.GetSessionSetupResponseExtended(header, request, m_users, state);
}
else if (command is EchoRequest)
{
return ServerResponseHelper.GetEchoResponse((EchoRequest)command, sendQueue);
}
else if (state.IsAuthenticated(header.UID))
{
if (command is TreeConnectAndXRequest)
{
TreeConnectAndXRequest request = (TreeConnectAndXRequest)command;
return TreeConnectHelper.GetTreeConnectResponse(header, request, state, m_services, m_shares);
}
else if (command is LogoffAndXRequest)
{
// FIXME: Remove connected trees that the user has connected to
state.RemoveConnectedUser(header.UID);
return new LogoffAndXResponse();
}
else if (state.IsTreeConnected(header.TID))
{
ISMBShare share = state.GetConnectedTree(header.TID);
if (command is CreateDirectoryRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
CreateDirectoryRequest request = (CreateDirectoryRequest)command;
return FileSystemResponseHelper.GetCreateDirectoryResponse(header, request, (FileSystemShare)share, state);
}
else if (command is DeleteDirectoryRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
DeleteDirectoryRequest request = (DeleteDirectoryRequest)command;
return FileSystemResponseHelper.GetDeleteDirectoryResponse(header, request, (FileSystemShare)share, state);
}
else if (command is CloseRequest)
{
CloseRequest request = (CloseRequest)command;
return ServerResponseHelper.GetCloseResponse(header, request, share, state);
}
else if (command is FlushRequest)
{
return new FlushResponse();
}
else if (command is DeleteRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
DeleteRequest request = (DeleteRequest)command;
return FileSystemResponseHelper.GetDeleteResponse(header, request, (FileSystemShare)share, state);
}
else if (command is RenameRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
RenameRequest request = (RenameRequest)command;
return FileSystemResponseHelper.GetRenameResponse(header, request, (FileSystemShare)share, state);
}
else if (command is QueryInformationRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
QueryInformationRequest request = (QueryInformationRequest)command;
return FileSystemResponseHelper.GetQueryInformationResponse(header, request, (FileSystemShare)share);
}
else if (command is SetInformationRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
SetInformationRequest request = (SetInformationRequest)command;
return FileSystemResponseHelper.GetSetInformationResponse(header, request, (FileSystemShare)share, state);
}
else if (command is ReadRequest)
{
ReadRequest request = (ReadRequest)command;
return ReadWriteResponseHelper.GetReadResponse(header, request, share, state);
}
else if (command is WriteRequest)
{
string userName = state.GetConnectedUserName(header.UID);
if (share is FileSystemShare && !((FileSystemShare)share).HasWriteAccess(userName))
{
header.Status = NTStatus.STATUS_ACCESS_DENIED;
return new ErrorResponse(command.CommandName);
}
WriteRequest request = (WriteRequest)command;
return ReadWriteResponseHelper.GetWriteResponse(header, request, share, state);
}
else if (command is CheckDirectoryRequest)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
CheckDirectoryRequest request = (CheckDirectoryRequest)command;
return FileSystemResponseHelper.GetCheckDirectoryResponse(header, request, (FileSystemShare)share);
}
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)
{
if (!(share is FileSystemShare))
{
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
SetInformation2Request request = (SetInformation2Request)command;
return FileSystemResponseHelper.GetSetInformation2Response(header, request, (FileSystemShare)share, state);
}
else if (command is LockingAndXRequest)
{
header.Status = NTStatus.STATUS_ACCESS_DENIED;
return new ErrorResponse(CommandName.SMB_COM_LOCKING_ANDX);
}
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)
{
string userName = state.GetConnectedUserName(header.UID);
if (share is FileSystemShare && !((FileSystemShare)share).HasWriteAccess(userName))
{
header.Status = NTStatus.STATUS_ACCESS_DENIED;
return new ErrorResponse(command.CommandName);
}
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, state);
}
else if (command is TransactionRequest) // Both TransactionRequest and Transaction2Request
{
TransactionRequest request = (TransactionRequest)command;
try
{
return TransactionHelper.GetTransactionResponse(header, request, share, state, sendQueue);
}
catch (UnsupportedInformationLevelException)
{
header.Status = NTStatus.STATUS_INVALID_PARAMETER;
return new ErrorResponse(command.CommandName);
}
}
else if (command is TransactionSecondaryRequest) // Both TransactionSecondaryRequest and Transaction2SecondaryRequest
{
TransactionSecondaryRequest request = (TransactionSecondaryRequest)command;
try
{
return TransactionHelper.GetTransactionResponse(header, request, share, state, sendQueue);
}
catch (UnsupportedInformationLevelException)
{
header.Status = NTStatus.STATUS_INVALID_PARAMETER;
return new ErrorResponse(command.CommandName);
}
}
else if (command is NTTransactRequest)
{
NTTransactRequest request = (NTTransactRequest)command;
return NTTransactHelper.GetNTTransactResponse(header, request, share, state, sendQueue);
}
else if (command is NTTransactSecondaryRequest)
{
NTTransactSecondaryRequest request = (NTTransactSecondaryRequest)command;
return NTTransactHelper.GetNTTransactResponse(header, request, share, state, sendQueue);
}
else if (command is NTCreateAndXRequest)
{
NTCreateAndXRequest request = (NTCreateAndXRequest)command;
return NTCreateHelper.GetNTCreateResponse(header, request, share, state);
}
}
else
{
header.Status = NTStatus.STATUS_SMB_BAD_TID;
return new ErrorResponse(command.CommandName);
}
}
header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
return new ErrorResponse(command.CommandName);
}
public static void TrySendMessage(SMB1ConnectionState state, SMB1Message response)
{
SessionMessagePacket packet = new SessionMessagePacket();
packet.Trailer = response.GetBytes();
TrySendPacket(state, packet);
state.LogToServer(Severity.Verbose, "Response sent: {0} Commands, First Command: {1}, Packet length: {2}", response.Commands.Count, response.Commands[0].CommandName.ToString(), packet.Length);
}
private static void PrepareResponseHeader(SMB1Message response, SMB1Message request)
{
response.Header.Status = NTStatus.STATUS_SUCCESS;
response.Header.Flags = HeaderFlags.CaseInsensitive | HeaderFlags.CanonicalizedPaths | HeaderFlags.Reply;
response.Header.Flags2 = HeaderFlags2.NTStatusCode;
if ((request.Header.Flags2 & HeaderFlags2.LongNamesAllowed) > 0)
{
response.Header.Flags2 |= HeaderFlags2.LongNamesAllowed | HeaderFlags2.LongNameUsed;
}
if ((request.Header.Flags2 & HeaderFlags2.ExtendedAttributes) > 0)
{
response.Header.Flags2 |= HeaderFlags2.ExtendedAttributes;
}
if ((request.Header.Flags2 & HeaderFlags2.ExtendedSecurity) > 0)
{
response.Header.Flags2 |= HeaderFlags2.ExtendedSecurity;
}
if ((request.Header.Flags2 & HeaderFlags2.Unicode) > 0)
{
response.Header.Flags2 |= HeaderFlags2.Unicode;
}
response.Header.MID = request.Header.MID;
response.Header.PID = request.Header.PID;
response.Header.UID = request.Header.UID;
response.Header.TID = request.Header.TID;
}
}
}
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