source3/smbd/smb2_ioctl.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "include/ntioctl.h"
  27 #include "smb2_ioctl_private.h"
  28 #include "librpc/gen_ndr/ioctl.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_SMB2
  32
  33 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
  34                                                struct tevent_context *ev,
  35                                                struct smbd_smb2_request *smb2req,
  36                                                struct files_struct *in_fsp,
  37                                                uint32_t in_ctl_code,
  38                                                DATA_BLOB in_input,
  39                                                uint32_t in_max_output,
  40                                                uint32_t in_flags);
  41 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
  42                                      TALLOC_CTX *mem_ctx,
  43                                      DATA_BLOB *out_output,
  44                                      bool *disconnect);
  45
  46 static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq);
  47 NTSTATUS smbd_smb2_request_process_ioctl(struct smbd_smb2_request *req)
  48 {
  49         NTSTATUS status;
  50         const uint8_t *inbody;
  51         uint32_t min_buffer_offset;
  52         uint32_t max_buffer_offset;
  53         uint32_t min_output_offset;
  54         uint32_t allowed_length_in;
  55         uint32_t allowed_length_out;
  56         uint32_t in_ctl_code;
  57         uint64_t in_file_id_persistent;
  58         uint64_t in_file_id_volatile;
  59         struct files_struct *in_fsp = NULL;
  60         uint32_t in_input_offset;
  61         uint32_t in_input_length;
  62         DATA_BLOB in_input_buffer = data_blob_null;
  63         uint32_t in_max_input_length;
  64         uint32_t in_output_offset;
  65         uint32_t in_output_length;
  66         DATA_BLOB in_output_buffer = data_blob_null;
  67         uint32_t in_max_output_length;
  68         uint32_t in_flags;
  69         uint32_t data_length_in;
  70         uint32_t data_length_out;
  71         uint32_t data_length_tmp;
  72         uint32_t data_length_max;
  73         struct tevent_req *subreq;
  74
  75         status = smbd_smb2_request_verify_sizes(req, 0x39);
  76         if (!NT_STATUS_IS_OK(status)) {
  77                 return smbd_smb2_request_error(req, status);
  78         }
  79         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  80
  81         in_ctl_code             = IVAL(inbody, 0x04);
  82         in_file_id_persistent   = BVAL(inbody, 0x08);
  83         in_file_id_volatile     = BVAL(inbody, 0x10);
  84         in_input_offset         = IVAL(inbody, 0x18);
  85         in_input_length         = IVAL(inbody, 0x1C);
  86         in_max_input_length     = IVAL(inbody, 0x20);
  87         in_output_offset        = IVAL(inbody, 0x24);
  88         in_output_length        = IVAL(inbody, 0x28);
  89         in_max_output_length    = IVAL(inbody, 0x2C);
  90         in_flags                = IVAL(inbody, 0x30);
  91
  92         min_buffer_offset = SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req);
  93         max_buffer_offset = min_buffer_offset + SMBD_SMB2_IN_DYN_LEN(req);
  94         min_output_offset = min_buffer_offset;
  95
  96         /*
  97          * InputOffset (4 bytes): The offset, in bytes, from the beginning of
  98          * the SMB2 header to the input data buffer. If no input data is
  99          * required for the FSCTL/IOCTL command being issued, the client SHOULD
 100          * set this value to 0.<49>
 101          * <49> If no input data is required for the FSCTL/IOCTL command being
 102          * issued, Windows-based clients set this field to any value.
 103          */
 104         allowed_length_in = 0;
 105         if ((in_input_offset > 0) && (in_input_length > 0)) {
 106                 uint32_t tmp_ofs;
 107
 108                 if (in_input_offset < min_buffer_offset) {
 109                         return smbd_smb2_request_error(req,
 110                                         NT_STATUS_INVALID_PARAMETER);
 111                 }
 112                 if (in_input_offset > max_buffer_offset) {
 113                         return smbd_smb2_request_error(req,
 114                                         NT_STATUS_INVALID_PARAMETER);
 115                 }
 116                 allowed_length_in = max_buffer_offset - in_input_offset;
 117
 118                 tmp_ofs = in_input_offset - min_buffer_offset;
 119                 in_input_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
 120                 in_input_buffer.data += tmp_ofs;
 121                 in_input_buffer.length = in_input_length;
 122                 min_output_offset += tmp_ofs;
 123                 min_output_offset += in_input_length;
 124         }
 125
 126         if (in_input_length > allowed_length_in) {
 127                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 128         }
 129
 130         allowed_length_out = 0;
 131         if (in_output_offset > 0) {
 132                 if (in_output_offset < min_buffer_offset) {
 133                         return smbd_smb2_request_error(req,
 134                                         NT_STATUS_INVALID_PARAMETER);
 135                 }
 136                 if (in_output_offset > max_buffer_offset) {
 137                         return smbd_smb2_request_error(req,
 138                                         NT_STATUS_INVALID_PARAMETER);
 139                 }
 140                 allowed_length_out = max_buffer_offset - in_output_offset;
 141         }
 142
 143         if (in_output_length > allowed_length_out) {
 144                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 145         }
 146
 147         if (in_output_length > 0) {
 148                 uint32_t tmp_ofs;
 149
 150                 if (in_output_offset < min_output_offset) {
 151                         return smbd_smb2_request_error(req,
 152                                         NT_STATUS_INVALID_PARAMETER);
 153                 }
 154
 155                 tmp_ofs = in_output_offset - min_buffer_offset;
 156                 in_output_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
 157                 in_output_buffer.data += tmp_ofs;
 158                 in_output_buffer.length = in_output_length;
 159         }
 160
 161         /*
 162          * verify the credits and avoid overflows
 163          * in_input_buffer.length and in_output_buffer.length
 164          * are already verified.
 165          */
 166         data_length_in = in_input_buffer.length + in_output_buffer.length;
 167
 168         data_length_out = in_max_input_length;
 169         data_length_tmp = UINT32_MAX - data_length_out;
 170         if (data_length_tmp < in_max_output_length) {
 171                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 172         }
 173         data_length_out += in_max_output_length;
 174
 175         data_length_max = MAX(data_length_in, data_length_out);
 176
 177         status = smbd_smb2_request_verify_creditcharge(req, data_length_max);
 178         if (!NT_STATUS_IS_OK(status)) {
 179                 return smbd_smb2_request_error(req, status);
 180         }
 181
 182         /*
 183          * If the Flags field of the request is not SMB2_0_IOCTL_IS_FSCTL the
 184          * server MUST fail the request with STATUS_NOT_SUPPORTED.
 185          */
 186         if (in_flags != SMB2_IOCTL_FLAG_IS_FSCTL) {
 187                 return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
 188         }
 189
 190         switch (in_ctl_code) {
 191         case FSCTL_DFS_GET_REFERRALS:
 192         case FSCTL_DFS_GET_REFERRALS_EX:
 193         case FSCTL_PIPE_WAIT:
 194         case FSCTL_VALIDATE_NEGOTIATE_INFO_224:
 195         case FSCTL_VALIDATE_NEGOTIATE_INFO:
 196         case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
 197         case FSCTL_SMBTORTURE_FORCE_UNACKED_TIMEOUT:
 198                 /*
 199                  * Some SMB2 specific CtlCodes like FSCTL_DFS_GET_REFERRALS or
 200                  * FSCTL_PIPE_WAIT does not take a file handle.
 201                  *
 202                  * If FileId in the SMB2 Header of the request is not
 203                  * 0xFFFFFFFFFFFFFFFF, then the server MUST fail the request
 204                  * with STATUS_INVALID_PARAMETER.
 205                  */
 206                 if (in_file_id_persistent != UINT64_MAX ||
 207                     in_file_id_volatile != UINT64_MAX) {
 208                         return smbd_smb2_request_error(req,
 209                                 NT_STATUS_INVALID_PARAMETER);
 210                 }
 211                 break;
 212         default:
 213                 in_fsp = file_fsp_smb2(req, in_file_id_persistent,
 214                                        in_file_id_volatile);
 215                 if (in_fsp == NULL) {
 216                         return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
 217                 }
 218                 break;
 219         }
 220
 221         subreq = smbd_smb2_ioctl_send(req, req->sconn->ev_ctx,
 222                                       req, in_fsp,
 223                                       in_ctl_code,
 224                                       in_input_buffer,
 225                                       in_max_output_length,
 226                                       in_flags);
 227         if (subreq == NULL) {
 228                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 229         }
 230         tevent_req_set_callback(subreq, smbd_smb2_request_ioctl_done, req);
 231
 232         return smbd_smb2_request_pending_queue(req, subreq, 1000);
 233 }
 234
 235 /*
 236  * 3.3.4.4 Sending an Error Response
 237  * An error code other than one of the following indicates a failure:
 238  */
 239 static bool smbd_smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
 240                                        size_t data_size)
 241 {
 242         if (NT_STATUS_IS_OK(status)) {
 243                 return false;
 244         }
 245
 246         /*
 247          * STATUS_BUFFER_OVERFLOW in a FSCTL_PIPE_TRANSCEIVE, FSCTL_PIPE_PEEK or
 248          * FSCTL_DFS_GET_REFERRALS Response specified in section 2.2.32.<153>
 249          */
 250         if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
 251          && ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
 252           || (ctl_code == FSCTL_PIPE_PEEK)
 253           || (ctl_code == FSCTL_DFS_GET_REFERRALS))) {
 254                 return false;
 255         }
 256
 257         /*
 258          * Any status other than STATUS_SUCCESS in a FSCTL_SRV_COPYCHUNK or
 259          * FSCTL_SRV_COPYCHUNK_WRITE Response, when returning an
 260          * SRV_COPYCHUNK_RESPONSE as described in section 2.2.32.1.
 261          */
 262         if (((ctl_code == FSCTL_SRV_COPYCHUNK)
 263                                 || (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE))
 264          && (data_size == sizeof(struct srv_copychunk_rsp))) {
 265                 return false;
 266         }
 267
 268         return true;
 269 }
 270
 271 static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
 272 {
 273         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 274                                         struct smbd_smb2_request);
 275         const uint8_t *inbody;
 276         DATA_BLOB outbody;
 277         DATA_BLOB outdyn;
 278         uint32_t in_ctl_code;
 279         uint64_t in_file_id_persistent;
 280         uint64_t in_file_id_volatile;
 281         uint32_t out_input_offset;
 282         uint32_t out_output_offset;
 283         DATA_BLOB out_output_buffer = data_blob_null;
 284         NTSTATUS status;
 285         NTSTATUS error; /* transport error */
 286         bool disconnect = false;
 287
 288         status = smbd_smb2_ioctl_recv(subreq, req,
 289                                       &out_output_buffer,
 290                                       &disconnect);
 291
 292         DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
 293                 "%u status %s\n",
 294                 (unsigned int)out_output_buffer.length,
 295                 nt_errstr(status) ));
 296
 297         TALLOC_FREE(subreq);
 298         if (disconnect) {
 299                 error = status;
 300                 smbd_server_connection_terminate(req->xconn,
 301                                                  nt_errstr(error));
 302                 return;
 303         }
 304
 305         inbody = SMBD_SMB2_IN_BODY_PTR(req);
 306
 307         in_ctl_code             = IVAL(inbody, 0x04);
 308         in_file_id_persistent   = BVAL(inbody, 0x08);
 309         in_file_id_volatile     = BVAL(inbody, 0x10);
 310
 311         if (smbd_smb2_ioctl_is_failure(in_ctl_code, status,
 312                                        out_output_buffer.length)) {
 313                 error = smbd_smb2_request_error(req, status);
 314                 if (!NT_STATUS_IS_OK(error)) {
 315                         smbd_server_connection_terminate(req->xconn,
 316                                                          nt_errstr(error));
 317                         return;
 318                 }
 319                 return;
 320         }
 321
 322         out_input_offset = SMB2_HDR_BODY + 0x30;
 323         out_output_offset = SMB2_HDR_BODY + 0x30;
 324
 325         outbody = smbd_smb2_generate_outbody(req, 0x30);
 326         if (outbody.data == NULL) {
 327                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 328                 if (!NT_STATUS_IS_OK(error)) {
 329                         smbd_server_connection_terminate(req->xconn,
 330                                                          nt_errstr(error));
 331                         return;
 332                 }
 333                 return;
 334         }
 335
 336         SSVAL(outbody.data, 0x00, 0x30 + 1);    /* struct size */
 337         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 338         SIVAL(outbody.data, 0x04,
 339               in_ctl_code);                     /* ctl code */
 340         SBVAL(outbody.data, 0x08,
 341               in_file_id_persistent);           /* file id (persistent) */
 342         SBVAL(outbody.data, 0x10,
 343               in_file_id_volatile);             /* file id (volatile) */
 344         SIVAL(outbody.data, 0x18,
 345               out_input_offset);                /* input offset */
 346         SIVAL(outbody.data, 0x1C, 0);           /* input count */
 347         SIVAL(outbody.data, 0x20,
 348               out_output_offset);               /* output offset */
 349         SIVAL(outbody.data, 0x24,
 350               out_output_buffer.length);        /* output count */
 351         SIVAL(outbody.data, 0x28, 0);           /* flags */
 352         SIVAL(outbody.data, 0x2C, 0);           /* reserved */
 353
 354         /*
 355          * Note: Windows Vista and 2008 send back also the
 356          *       input from the request. But it was fixed in
 357          *       Windows 7.
 358          */
 359         outdyn = out_output_buffer;
 360
 361         error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
 362                                           __location__);
 363         if (!NT_STATUS_IS_OK(error)) {
 364                 smbd_server_connection_terminate(req->xconn,
 365                                                  nt_errstr(error));
 366                 return;
 367         }
 368 }
 369
 370 static struct tevent_req *smb2_ioctl_smbtorture(uint32_t ctl_code,
 371                                         struct tevent_context *ev,
 372                                         struct tevent_req *req,
 373                                         struct smbd_smb2_ioctl_state *state)
 374 {
 375         NTSTATUS status;
 376         bool ok;
 377
 378         ok = lp_parm_bool(-1, "smbd", "FSCTL_SMBTORTURE", false);
 379         if (!ok) {
 380                 goto not_supported;
 381         }
 382
 383         switch (ctl_code) {
 384         case FSCTL_SMBTORTURE_FORCE_UNACKED_TIMEOUT:
 385                 if (state->in_input.length != 0) {
 386                         tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 387                         return tevent_req_post(req, ev);
 388                 }
 389
 390                 state->smb2req->xconn->ack.force_unacked_timeout = true;
 391                 tevent_req_done(req);
 392                 return tevent_req_post(req, ev);
 393
 394         default:
 395                 goto not_supported;
 396         }
 397
 398 not_supported:
 399         if (IS_IPC(state->smbreq->conn)) {
 400                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 401         } else {
 402                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 403         }
 404
 405         tevent_req_nterror(req, status);
 406         return tevent_req_post(req, ev);
 407 }
 408
 409 static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
 410                                                struct tevent_context *ev,
 411                                                struct smbd_smb2_request *smb2req,
 412                                                struct files_struct *fsp,
 413                                                uint32_t in_ctl_code,
 414                                                DATA_BLOB in_input,
 415                                                uint32_t in_max_output,
 416                                                uint32_t in_flags)
 417 {
 418         struct tevent_req *req;
 419         struct smbd_smb2_ioctl_state *state;
 420         struct smb_request *smbreq;
 421
 422         req = tevent_req_create(mem_ctx, &state,
 423                                 struct smbd_smb2_ioctl_state);
 424         if (req == NULL) {
 425                 return NULL;
 426         }
 427         state->smb2req = smb2req;
 428         state->smbreq = NULL;
 429         state->fsp = fsp;
 430         state->in_input = in_input;
 431         state->in_max_output = in_max_output;
 432         state->out_output = data_blob_null;
 433
 434         DEBUG(10, ("smbd_smb2_ioctl: ctl_code[0x%08x] %s, %s\n",
 435                    (unsigned)in_ctl_code,
 436                    fsp ? fsp_str_dbg(fsp) : "<no handle>",
 437                    fsp_fnum_dbg(fsp)));
 438
 439         smbreq = smbd_smb2_fake_smb_request(smb2req);
 440         if (tevent_req_nomem(smbreq, req)) {
 441                 return tevent_req_post(req, ev);
 442         }
 443         state->smbreq = smbreq;
 444
 445         switch (in_ctl_code & IOCTL_DEV_TYPE_MASK) {
 446         case FSCTL_DFS:
 447                 return smb2_ioctl_dfs(in_ctl_code, ev, req, state);
 448                 break;
 449         case FSCTL_FILESYSTEM:
 450                 return smb2_ioctl_filesys(in_ctl_code, ev, req, state);
 451                 break;
 452         case FSCTL_NAMED_PIPE:
 453                 return smb2_ioctl_named_pipe(in_ctl_code, ev, req, state);
 454                 break;
 455         case FSCTL_NETWORK_FILESYSTEM:
 456                 return smb2_ioctl_network_fs(in_ctl_code, ev, req, state);
 457                 break;
 458         case FSCTL_SMBTORTURE:
 459                 return smb2_ioctl_smbtorture(in_ctl_code, ev, req, state);
 460                 break;
 461         default:
 462                 if (IS_IPC(smbreq->conn)) {
 463                         tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
 464                 } else {
 465                         tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
 466                 }
 467
 468                 return tevent_req_post(req, ev);
 469                 break;
 470         }
 471
 472         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 473         return tevent_req_post(req, ev);
 474 }
 475
 476 static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
 477                                      TALLOC_CTX *mem_ctx,
 478                                      DATA_BLOB *out_output,
 479                                      bool *disconnect)
 480 {
 481         NTSTATUS status = NT_STATUS_OK;
 482         struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
 483                                               struct smbd_smb2_ioctl_state);
 484         enum tevent_req_state req_state;
 485         uint64_t err;
 486
 487         *disconnect = state->disconnect;
 488
 489         if ((tevent_req_is_error(req, &req_state, &err) == false)
 490          || (req_state == TEVENT_REQ_USER_ERROR)) {
 491                 /*
 492                  * Return output buffer to caller if the ioctl was successfully
 493                  * processed, even if a user error occurred. Some ioctls return
 494                  * data on failure.
 495                  */
 496                 *out_output = state->out_output;
 497                 talloc_steal(mem_ctx, out_output->data);
 498         }
 499
 500         tevent_req_is_nterror(req, &status);
 501         tevent_req_received(req);
 502         return status;
 503 }