SMBServer.SMB1.cs 17 KB

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  1. /* Copyright (C) 2014-2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
  2. *
  3. * You can redistribute this program and/or modify it under the terms of
  4. * the GNU Lesser Public License as published by the Free Software Foundation,
  5. * either version 3 of the License, or (at your option) any later version.
  6. */
  7. using System;
  8. using System.Collections.Generic;
  9. using SMBLibrary.NetBios;
  10. using SMBLibrary.Server.SMB1;
  11. using SMBLibrary.SMB1;
  12. using Utilities;
  13. namespace SMBLibrary.Server
  14. {
  15. public partial class SMBServer
  16. {
  17. public void ProcessSMB1Message(SMB1Message message, SMB1ConnectionState state)
  18. {
  19. SMB1Message reply = new SMB1Message();
  20. PrepareResponseHeader(reply, message);
  21. List<SMB1Command> sendQueue = new List<SMB1Command>();
  22. foreach (SMB1Command command in message.Commands)
  23. {
  24. SMB1Command response = ProcessSMB1Command(reply.Header, command, state, sendQueue);
  25. if (response != null)
  26. {
  27. reply.Commands.Add(response);
  28. }
  29. if (reply.Header.Status != NTStatus.STATUS_SUCCESS)
  30. {
  31. break;
  32. }
  33. }
  34. if (reply.Commands.Count > 0)
  35. {
  36. TrySendMessage(state, reply);
  37. foreach (SMB1Command command in sendQueue)
  38. {
  39. SMB1Message secondaryReply = new SMB1Message();
  40. secondaryReply.Header = reply.Header;
  41. secondaryReply.Commands.Add(command);
  42. TrySendMessage(state, secondaryReply);
  43. }
  44. }
  45. }
  46. /// <summary>
  47. /// May return null
  48. /// </summary>
  49. public SMB1Command ProcessSMB1Command(SMB1Header header, SMB1Command command, SMB1ConnectionState state, List<SMB1Command> sendQueue)
  50. {
  51. if (command is NegotiateRequest)
  52. {
  53. NegotiateRequest request = (NegotiateRequest)command;
  54. if (request.Dialects.Contains(SMBServer.NTLanManagerDialect))
  55. {
  56. if (EnableExtendedSecurity && header.ExtendedSecurityFlag)
  57. {
  58. return NegotiateHelper.GetNegotiateResponseExtended(request, m_serverGuid);
  59. }
  60. else
  61. {
  62. return NegotiateHelper.GetNegotiateResponse(header, request, m_users);
  63. }
  64. }
  65. else
  66. {
  67. return new NegotiateResponseNotSupported();
  68. }
  69. }
  70. else if (command is SessionSetupAndXRequest)
  71. {
  72. SessionSetupAndXRequest request = (SessionSetupAndXRequest)command;
  73. state.MaxBufferSize = request.MaxBufferSize;
  74. return SessionSetupHelper.GetSessionSetupResponse(header, request, m_users, state);
  75. }
  76. else if (command is SessionSetupAndXRequestExtended)
  77. {
  78. SessionSetupAndXRequestExtended request = (SessionSetupAndXRequestExtended)command;
  79. state.MaxBufferSize = request.MaxBufferSize;
  80. return SessionSetupHelper.GetSessionSetupResponseExtended(header, request, m_users, state);
  81. }
  82. else if (command is EchoRequest)
  83. {
  84. return ServerResponseHelper.GetEchoResponse((EchoRequest)command, sendQueue);
  85. }
  86. else
  87. {
  88. SMB1Session session = state.GetSession(header.UID);
  89. if (session == null)
  90. {
  91. header.Status = NTStatus.STATUS_USER_SESSION_DELETED;
  92. return new ErrorResponse(command.CommandName);
  93. }
  94. if (command is TreeConnectAndXRequest)
  95. {
  96. TreeConnectAndXRequest request = (TreeConnectAndXRequest)command;
  97. return TreeConnectHelper.GetTreeConnectResponse(header, request, state, m_services, m_shares);
  98. }
  99. else if (command is LogoffAndXRequest)
  100. {
  101. state.RemoveSession(header.UID);
  102. return new LogoffAndXResponse();
  103. }
  104. else
  105. {
  106. ISMBShare share = session.GetConnectedTree(header.TID);
  107. if (share == null)
  108. {
  109. header.Status = NTStatus.STATUS_SMB_BAD_TID;
  110. return new ErrorResponse(command.CommandName);
  111. }
  112. if (command is CreateDirectoryRequest)
  113. {
  114. if (!(share is FileSystemShare))
  115. {
  116. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  117. return new ErrorResponse(command.CommandName);
  118. }
  119. CreateDirectoryRequest request = (CreateDirectoryRequest)command;
  120. return FileSystemResponseHelper.GetCreateDirectoryResponse(header, request, (FileSystemShare)share, state);
  121. }
  122. else if (command is DeleteDirectoryRequest)
  123. {
  124. if (!(share is FileSystemShare))
  125. {
  126. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  127. return new ErrorResponse(command.CommandName);
  128. }
  129. DeleteDirectoryRequest request = (DeleteDirectoryRequest)command;
  130. return FileSystemResponseHelper.GetDeleteDirectoryResponse(header, request, (FileSystemShare)share, state);
  131. }
  132. else if (command is CloseRequest)
  133. {
  134. CloseRequest request = (CloseRequest)command;
  135. return ServerResponseHelper.GetCloseResponse(header, request, share, state);
  136. }
  137. else if (command is FlushRequest)
  138. {
  139. return new FlushResponse();
  140. }
  141. else if (command is DeleteRequest)
  142. {
  143. if (!(share is FileSystemShare))
  144. {
  145. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  146. return new ErrorResponse(command.CommandName);
  147. }
  148. DeleteRequest request = (DeleteRequest)command;
  149. return FileSystemResponseHelper.GetDeleteResponse(header, request, (FileSystemShare)share, state);
  150. }
  151. else if (command is RenameRequest)
  152. {
  153. if (!(share is FileSystemShare))
  154. {
  155. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  156. return new ErrorResponse(command.CommandName);
  157. }
  158. RenameRequest request = (RenameRequest)command;
  159. return FileSystemResponseHelper.GetRenameResponse(header, request, (FileSystemShare)share, state);
  160. }
  161. else if (command is QueryInformationRequest)
  162. {
  163. if (!(share is FileSystemShare))
  164. {
  165. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  166. return new ErrorResponse(command.CommandName);
  167. }
  168. QueryInformationRequest request = (QueryInformationRequest)command;
  169. return FileSystemResponseHelper.GetQueryInformationResponse(header, request, (FileSystemShare)share);
  170. }
  171. else if (command is SetInformationRequest)
  172. {
  173. if (!(share is FileSystemShare))
  174. {
  175. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  176. return new ErrorResponse(command.CommandName);
  177. }
  178. SetInformationRequest request = (SetInformationRequest)command;
  179. return FileSystemResponseHelper.GetSetInformationResponse(header, request, (FileSystemShare)share, state);
  180. }
  181. else if (command is ReadRequest)
  182. {
  183. ReadRequest request = (ReadRequest)command;
  184. return ReadWriteResponseHelper.GetReadResponse(header, request, share, state);
  185. }
  186. else if (command is WriteRequest)
  187. {
  188. string userName = session.UserName;
  189. if (share is FileSystemShare && !((FileSystemShare)share).HasWriteAccess(userName))
  190. {
  191. header.Status = NTStatus.STATUS_ACCESS_DENIED;
  192. return new ErrorResponse(command.CommandName);
  193. }
  194. WriteRequest request = (WriteRequest)command;
  195. return ReadWriteResponseHelper.GetWriteResponse(header, request, share, state);
  196. }
  197. else if (command is CheckDirectoryRequest)
  198. {
  199. if (!(share is FileSystemShare))
  200. {
  201. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  202. return new ErrorResponse(command.CommandName);
  203. }
  204. CheckDirectoryRequest request = (CheckDirectoryRequest)command;
  205. return FileSystemResponseHelper.GetCheckDirectoryResponse(header, request, (FileSystemShare)share);
  206. }
  207. else if (command is WriteRawRequest)
  208. {
  209. // [MS-CIFS] 3.3.5.26 - Receiving an SMB_COM_WRITE_RAW Request:
  210. // the server MUST verify that the Server.Capabilities include CAP_RAW_MODE,
  211. // If an error is detected [..] the Write Raw operation MUST fail and
  212. // the server MUST return a Final Server Response [..] with the Count field set to zero.
  213. return new WriteRawFinalResponse();
  214. }
  215. else if (command is SetInformation2Request)
  216. {
  217. if (!(share is FileSystemShare))
  218. {
  219. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  220. return new ErrorResponse(command.CommandName);
  221. }
  222. SetInformation2Request request = (SetInformation2Request)command;
  223. return FileSystemResponseHelper.GetSetInformation2Response(header, request, (FileSystemShare)share, state);
  224. }
  225. else if (command is LockingAndXRequest)
  226. {
  227. header.Status = NTStatus.STATUS_ACCESS_DENIED;
  228. return new ErrorResponse(CommandName.SMB_COM_LOCKING_ANDX);
  229. }
  230. else if (command is OpenAndXRequest)
  231. {
  232. OpenAndXRequest request = (OpenAndXRequest)command;
  233. return OpenAndXHelper.GetOpenAndXResponse(header, request, share, state);
  234. }
  235. else if (command is ReadAndXRequest)
  236. {
  237. ReadAndXRequest request = (ReadAndXRequest)command;
  238. return ReadWriteResponseHelper.GetReadResponse(header, request, share, state);
  239. }
  240. else if (command is WriteAndXRequest)
  241. {
  242. string userName = session.UserName;
  243. if (share is FileSystemShare && !((FileSystemShare)share).HasWriteAccess(userName))
  244. {
  245. header.Status = NTStatus.STATUS_ACCESS_DENIED;
  246. return new ErrorResponse(command.CommandName);
  247. }
  248. WriteAndXRequest request = (WriteAndXRequest)command;
  249. return ReadWriteResponseHelper.GetWriteResponse(header, request, share, state);
  250. }
  251. else if (command is FindClose2Request)
  252. {
  253. return ServerResponseHelper.GetFindClose2Request(header, (FindClose2Request)command, state);
  254. }
  255. else if (command is TreeDisconnectRequest)
  256. {
  257. TreeDisconnectRequest request = (TreeDisconnectRequest)command;
  258. return TreeConnectHelper.GetTreeDisconnectResponse(header, request, state);
  259. }
  260. else if (command is TransactionRequest) // Both TransactionRequest and Transaction2Request
  261. {
  262. TransactionRequest request = (TransactionRequest)command;
  263. try
  264. {
  265. return TransactionHelper.GetTransactionResponse(header, request, share, state, sendQueue);
  266. }
  267. catch (UnsupportedInformationLevelException)
  268. {
  269. header.Status = NTStatus.STATUS_INVALID_PARAMETER;
  270. return new ErrorResponse(command.CommandName);
  271. }
  272. }
  273. else if (command is TransactionSecondaryRequest) // Both TransactionSecondaryRequest and Transaction2SecondaryRequest
  274. {
  275. TransactionSecondaryRequest request = (TransactionSecondaryRequest)command;
  276. try
  277. {
  278. return TransactionHelper.GetTransactionResponse(header, request, share, state, sendQueue);
  279. }
  280. catch (UnsupportedInformationLevelException)
  281. {
  282. header.Status = NTStatus.STATUS_INVALID_PARAMETER;
  283. return new ErrorResponse(command.CommandName);
  284. }
  285. }
  286. else if (command is NTTransactRequest)
  287. {
  288. NTTransactRequest request = (NTTransactRequest)command;
  289. return NTTransactHelper.GetNTTransactResponse(header, request, share, state, sendQueue);
  290. }
  291. else if (command is NTTransactSecondaryRequest)
  292. {
  293. NTTransactSecondaryRequest request = (NTTransactSecondaryRequest)command;
  294. return NTTransactHelper.GetNTTransactResponse(header, request, share, state, sendQueue);
  295. }
  296. else if (command is NTCreateAndXRequest)
  297. {
  298. NTCreateAndXRequest request = (NTCreateAndXRequest)command;
  299. return NTCreateHelper.GetNTCreateResponse(header, request, share, state);
  300. }
  301. }
  302. }
  303. header.Status = NTStatus.STATUS_SMB_BAD_COMMAND;
  304. return new ErrorResponse(command.CommandName);
  305. }
  306. public static void TrySendMessage(SMB1ConnectionState state, SMB1Message response)
  307. {
  308. SessionMessagePacket packet = new SessionMessagePacket();
  309. packet.Trailer = response.GetBytes();
  310. TrySendPacket(state, packet);
  311. state.LogToServer(Severity.Verbose, "Response sent: {0} Commands, First Command: {1}, Packet length: {2}", response.Commands.Count, response.Commands[0].CommandName.ToString(), packet.Length);
  312. }
  313. private static void PrepareResponseHeader(SMB1Message response, SMB1Message request)
  314. {
  315. response.Header.Status = NTStatus.STATUS_SUCCESS;
  316. response.Header.Flags = HeaderFlags.CaseInsensitive | HeaderFlags.CanonicalizedPaths | HeaderFlags.Reply;
  317. response.Header.Flags2 = HeaderFlags2.NTStatusCode;
  318. if ((request.Header.Flags2 & HeaderFlags2.LongNamesAllowed) > 0)
  319. {
  320. response.Header.Flags2 |= HeaderFlags2.LongNamesAllowed | HeaderFlags2.LongNameUsed;
  321. }
  322. if ((request.Header.Flags2 & HeaderFlags2.ExtendedAttributes) > 0)
  323. {
  324. response.Header.Flags2 |= HeaderFlags2.ExtendedAttributes;
  325. }
  326. if ((request.Header.Flags2 & HeaderFlags2.ExtendedSecurity) > 0)
  327. {
  328. response.Header.Flags2 |= HeaderFlags2.ExtendedSecurity;
  329. }
  330. if ((request.Header.Flags2 & HeaderFlags2.Unicode) > 0)
  331. {
  332. response.Header.Flags2 |= HeaderFlags2.Unicode;
  333. }
  334. response.Header.MID = request.Header.MID;
  335. response.Header.PID = request.Header.PID;
  336. response.Header.UID = request.Header.UID;
  337. response.Header.TID = request.Header.TID;
  338. }
  339. }
  340. }