source3/smbd/smb2_ioctl_network_fs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) David Disseldorp 2012
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../libcli/security/security.h"
  27 #include "../lib/util/tevent_ntstatus.h"
  28 #include "../lib/ccan/build_assert/build_assert.h"
  29 #include "include/ntioctl.h"
  30 #include "../librpc/ndr/libndr.h"
  31 #include "librpc/gen_ndr/ndr_ioctl.h"
  32 #include "smb2_ioctl_private.h"
  33
  34 #define COPYCHUNK_MAX_CHUNKS    256             /* 2k8r2 & win8 = 256 */
  35 #define COPYCHUNK_MAX_CHUNK_LEN 1048576         /* 2k8r2 & win8 = 1048576 */
  36 #define COPYCHUNK_MAX_TOTAL_LEN 16777216        /* 2k8r2 & win8 = 16777216 */
  37 static void copychunk_pack_limits(struct srv_copychunk_rsp *cc_rsp)
  38 {
  39         cc_rsp->chunks_written = COPYCHUNK_MAX_CHUNKS;
  40         cc_rsp->chunk_bytes_written = COPYCHUNK_MAX_CHUNK_LEN;
  41         cc_rsp->total_bytes_written = COPYCHUNK_MAX_TOTAL_LEN;
  42 }
  43
  44 static NTSTATUS copychunk_check_limits(struct srv_copychunk_copy *cc_copy)
  45 {
  46         uint32_t i;
  47         uint32_t total_len = 0;
  48
  49         if (cc_copy->chunk_count > COPYCHUNK_MAX_CHUNKS) {
  50                 return NT_STATUS_INVALID_PARAMETER;
  51         }
  52
  53         for (i = 0; i < cc_copy->chunk_count; i++) {
  54                 if (cc_copy->chunks[i].length > COPYCHUNK_MAX_CHUNK_LEN) {
  55                         return NT_STATUS_INVALID_PARAMETER;
  56                 }
  57                 total_len += cc_copy->chunks[i].length;
  58         }
  59         if (total_len > COPYCHUNK_MAX_TOTAL_LEN) {
  60                 return NT_STATUS_INVALID_PARAMETER;
  61         }
  62
  63         return NT_STATUS_OK;
  64 }
  65
  66 struct fsctl_srv_copychunk_state {
  67         struct connection_struct *conn;
  68         uint32_t dispatch_count;
  69         uint32_t recv_count;
  70         uint32_t bad_recv_count;
  71         NTSTATUS status;
  72         off_t total_written;
  73         struct files_struct *src_fsp;
  74         struct files_struct *dst_fsp;
  75         enum {
  76                 COPYCHUNK_OUT_EMPTY = 0,
  77                 COPYCHUNK_OUT_LIMITS,
  78                 COPYCHUNK_OUT_RSP,
  79         } out_data;
  80 };
  81 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq);
  82
  83 static NTSTATUS copychunk_check_handles(struct files_struct *src_fsp,
  84                                         struct files_struct *dst_fsp,
  85                                         struct smb_request *smb1req)
  86 {
  87         /*
  88          * [MS-SMB2] 3.3.5.15.6 Handling a Server-Side Data Copy Request
  89          * If Open.GrantedAccess of the destination file does not
  90          * include FILE_WRITE_DATA, then the request MUST be failed with
  91          * STATUS_ACCESS_DENIED. If Open.GrantedAccess of the
  92          * destination file does not include FILE_READ_DATA access and
  93          * the CtlCode is FSCTL_SRV_COPYCHUNK, then the request MUST be
  94          * failed with STATUS_ACCESS_DENIED.
  95          */
  96         if (!CHECK_WRITE(dst_fsp)) {
  97                 DEBUG(5, ("copy chunk no write on dest handle (%s).\n",
  98                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
  99                 return NT_STATUS_ACCESS_DENIED;
 100         }
 101         if (!CHECK_READ(dst_fsp, smb1req)) {
 102                 DEBUG(5, ("copy chunk no read on dest handle (%s).\n",
 103                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 104                 return NT_STATUS_ACCESS_DENIED;
 105         }
 106         if (!CHECK_READ(src_fsp, smb1req)) {
 107                 DEBUG(5, ("copy chunk no read on src handle (%s).\n",
 108                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 109                 return NT_STATUS_ACCESS_DENIED;
 110         }
 111
 112         if (src_fsp->is_directory) {
 113                 DEBUG(5, ("copy chunk no read on src directory handle (%s).\n",
 114                         smb_fname_str_dbg(src_fsp->fsp_name) ));
 115                 return NT_STATUS_ACCESS_DENIED;
 116         }
 117
 118         if (dst_fsp->is_directory) {
 119                 DEBUG(5, ("copy chunk no read on dst directory handle (%s).\n",
 120                         smb_fname_str_dbg(dst_fsp->fsp_name) ));
 121                 return NT_STATUS_ACCESS_DENIED;
 122         }
 123
 124         if (IS_IPC(src_fsp->conn) || IS_IPC(dst_fsp->conn)) {
 125                 DEBUG(5, ("copy chunk no access on IPC$ handle.\n"));
 126                 return NT_STATUS_ACCESS_DENIED;
 127         }
 128
 129         if (IS_PRINT(src_fsp->conn) || IS_PRINT(dst_fsp->conn)) {
 130                 DEBUG(5, ("copy chunk no access on PRINT handle.\n"));
 131                 return NT_STATUS_ACCESS_DENIED;
 132         }
 133
 134         return NT_STATUS_OK;
 135 }
 136
 137 static struct tevent_req *fsctl_srv_copychunk_send(TALLOC_CTX *mem_ctx,
 138                                                    struct tevent_context *ev,
 139                                                    struct files_struct *dst_fsp,
 140                                                    DATA_BLOB *in_input,
 141                                                    size_t in_max_output,
 142                                                    struct smbd_smb2_request *smb2req)
 143 {
 144         struct tevent_req *req;
 145         struct srv_copychunk_copy cc_copy;
 146         enum ndr_err_code ndr_ret;
 147         uint64_t src_persistent_h;
 148         uint64_t src_volatile_h;
 149         int i;
 150         struct srv_copychunk *chunk;
 151         struct fsctl_srv_copychunk_state *state;
 152
 153         req = tevent_req_create(mem_ctx, &state,
 154                                 struct fsctl_srv_copychunk_state);
 155         if (req == NULL) {
 156                 return NULL;
 157         }
 158         state->conn = dst_fsp->conn;
 159
 160         if (in_max_output < sizeof(struct srv_copychunk_rsp)) {
 161                 DEBUG(3, ("max output %d not large enough to hold copy chunk "
 162                           "response %lu\n", (int)in_max_output,
 163                           (unsigned long)sizeof(struct srv_copychunk_rsp)));
 164                 state->status = NT_STATUS_INVALID_PARAMETER;
 165                 tevent_req_nterror(req, state->status);
 166                 return tevent_req_post(req, ev);
 167         }
 168
 169         ndr_ret = ndr_pull_struct_blob(in_input, mem_ctx, &cc_copy,
 170                         (ndr_pull_flags_fn_t)ndr_pull_srv_copychunk_copy);
 171         if (ndr_ret != NDR_ERR_SUCCESS) {
 172                 DEBUG(0, ("failed to unmarshall copy chunk req\n"));
 173                 state->status = NT_STATUS_INVALID_PARAMETER;
 174                 tevent_req_nterror(req, state->status);
 175                 return tevent_req_post(req, ev);
 176         }
 177
 178         /* persistent/volatile keys sent as the resume key */
 179         src_persistent_h = BVAL(cc_copy.source_key, 0);
 180         src_volatile_h = BVAL(cc_copy.source_key, 8);
 181         state->src_fsp = file_fsp_get(smb2req, src_persistent_h, src_volatile_h);
 182         if (state->src_fsp == NULL) {
 183                 DEBUG(3, ("invalid resume key in copy chunk req\n"));
 184                 state->status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 185                 tevent_req_nterror(req, state->status);
 186                 return tevent_req_post(req, ev);
 187         }
 188
 189         state->dst_fsp = dst_fsp;
 190
 191         state->status = copychunk_check_handles(state->src_fsp,
 192                                                 state->dst_fsp,
 193                                                 smb2req->smb1req);
 194         if (!NT_STATUS_IS_OK(state->status)) {
 195                 tevent_req_nterror(req, state->status);
 196                 return tevent_req_post(req, ev);
 197         }
 198
 199         state->status = copychunk_check_limits(&cc_copy);
 200         if (tevent_req_nterror(req, state->status)) {
 201                 DEBUG(3, ("copy chunk req exceeds limits\n"));
 202                 state->out_data = COPYCHUNK_OUT_LIMITS;
 203                 return tevent_req_post(req, ev);
 204         }
 205
 206         /* any errors from here onwards should carry copychunk response data */
 207         state->out_data = COPYCHUNK_OUT_RSP;
 208
 209         for (i = 0; i < cc_copy.chunk_count; i++) {
 210                 struct tevent_req *vfs_subreq;
 211                 chunk = &cc_copy.chunks[i];
 212                 vfs_subreq = SMB_VFS_COPY_CHUNK_SEND(dst_fsp->conn,
 213                                                      state, ev,
 214                                                      state->src_fsp,
 215                                                      chunk->source_off,
 216                                                      state->dst_fsp,
 217                                                      chunk->target_off,
 218                                                      chunk->length);
 219                 if (vfs_subreq == NULL) {
 220                         DEBUG(0, ("VFS copy chunk send failed\n"));
 221                         state->status = NT_STATUS_NO_MEMORY;
 222                         if (state->dispatch_count == 0) {
 223                                 /* nothing dispatched, return immediately */
 224                                 tevent_req_nterror(req, state->status);
 225                                 return tevent_req_post(req, ev);
 226                         } else {
 227                                 /*
 228                                  * wait for dispatched to complete before
 229                                  * returning error.
 230                                  */
 231                                 break;
 232                         }
 233                 }
 234                 tevent_req_set_callback(vfs_subreq,
 235                                         fsctl_srv_copychunk_vfs_done, req);
 236                 state->dispatch_count++;
 237         }
 238
 239         return req;
 240 }
 241
 242 static void fsctl_srv_copychunk_vfs_done(struct tevent_req *subreq)
 243 {
 244         struct tevent_req *req = tevent_req_callback_data(
 245                 subreq, struct tevent_req);
 246         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 247                                         struct fsctl_srv_copychunk_state);
 248         off_t chunk_nwritten;
 249         NTSTATUS status;
 250
 251         state->recv_count++;
 252         status = SMB_VFS_COPY_CHUNK_RECV(state->conn, subreq,
 253                                          &chunk_nwritten);
 254         TALLOC_FREE(subreq);
 255         if (NT_STATUS_IS_OK(status)) {
 256                 DEBUG(10, ("good copy chunk recv %u of %u\n",
 257                            (unsigned int)state->recv_count,
 258                            (unsigned int)state->dispatch_count));
 259                 state->total_written += chunk_nwritten;
 260         } else {
 261                 DEBUG(0, ("bad status in copy chunk recv %u of %u: %s\n",
 262                           (unsigned int)state->recv_count,
 263                           (unsigned int)state->dispatch_count,
 264                           nt_errstr(status)));
 265                 state->bad_recv_count++;
 266                 /* may overwrite previous failed status */
 267                 state->status = status;
 268         }
 269
 270         if (state->recv_count != state->dispatch_count) {
 271                 /*
 272                  * Wait for all VFS copy_chunk requests to complete, even
 273                  * if an error is received for a specific chunk.
 274                  */
 275                 return;
 276         }
 277
 278         if (!tevent_req_nterror(req, state->status)) {
 279                 tevent_req_done(req);
 280         }
 281 }
 282
 283 static NTSTATUS fsctl_srv_copychunk_recv(struct tevent_req *req,
 284                                          struct srv_copychunk_rsp *cc_rsp,
 285                                          bool *pack_rsp)
 286 {
 287         struct fsctl_srv_copychunk_state *state = tevent_req_data(req,
 288                                         struct fsctl_srv_copychunk_state);
 289         NTSTATUS status;
 290
 291         switch (state->out_data) {
 292         case COPYCHUNK_OUT_EMPTY:
 293                 *pack_rsp = false;
 294                 break;
 295         case COPYCHUNK_OUT_LIMITS:
 296                 /* 2.2.32.1 - send back our maximum transfer size limits */
 297                 copychunk_pack_limits(cc_rsp);
 298                 *pack_rsp = true;
 299                 break;
 300         case COPYCHUNK_OUT_RSP:
 301                 cc_rsp->chunks_written = state->recv_count - state->bad_recv_count;
 302                 cc_rsp->chunk_bytes_written = 0;
 303                 cc_rsp->total_bytes_written = state->total_written;
 304                 *pack_rsp = true;
 305                 break;
 306         default:        /* not reached */
 307                 assert(1);
 308                 break;
 309         }
 310         status = state->status;
 311         tevent_req_received(req);
 312
 313         return status;
 314 }
 315
 316 static NTSTATUS fsctl_validate_neg_info(TALLOC_CTX *mem_ctx,
 317                                         struct tevent_context *ev,
 318                                         struct smbXsrv_connection *conn,
 319                                         DATA_BLOB *in_input,
 320                                         uint32_t in_max_output,
 321                                         DATA_BLOB *out_output,
 322                                         bool *disconnect)
 323 {
 324         uint32_t in_capabilities;
 325         DATA_BLOB in_guid_blob;
 326         struct GUID in_guid;
 327         uint16_t in_security_mode;
 328         uint16_t in_num_dialects;
 329         uint16_t i;
 330         DATA_BLOB out_guid_blob;
 331         NTSTATUS status;
 332
 333         if (in_input->length < 0x18) {
 334                 return NT_STATUS_INVALID_PARAMETER;
 335         }
 336
 337         in_capabilities = IVAL(in_input->data, 0x00);
 338         in_guid_blob = data_blob_const(in_input->data + 0x04, 16);
 339         in_security_mode = SVAL(in_input->data, 0x14);
 340         in_num_dialects = SVAL(in_input->data, 0x16);
 341
 342         if (in_input->length < (0x18 + in_num_dialects*2)) {
 343                 return NT_STATUS_INVALID_PARAMETER;
 344         }
 345
 346         if (in_max_output < 0x18) {
 347                 return NT_STATUS_BUFFER_TOO_SMALL;
 348         }
 349
 350         status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
 351         if (!NT_STATUS_IS_OK(status)) {
 352                 return status;
 353         }
 354
 355         if (in_num_dialects != conn->smb2.client.num_dialects) {
 356                 *disconnect = true;
 357                 return NT_STATUS_ACCESS_DENIED;
 358         }
 359
 360         for (i=0; i < in_num_dialects; i++) {
 361                 uint16_t v = SVAL(in_input->data, 0x18 + i*2);
 362
 363                 if (conn->smb2.client.dialects[i] != v) {
 364                         *disconnect = true;
 365                         return NT_STATUS_ACCESS_DENIED;
 366                 }
 367         }
 368
 369         if (GUID_compare(&in_guid, &conn->smb2.client.guid) != 0) {
 370                 *disconnect = true;
 371                 return NT_STATUS_ACCESS_DENIED;
 372         }
 373
 374         if (in_security_mode != conn->smb2.client.security_mode) {
 375                 *disconnect = true;
 376                 return NT_STATUS_ACCESS_DENIED;
 377         }
 378
 379         if (in_capabilities != conn->smb2.client.capabilities) {
 380                 *disconnect = true;
 381                 return NT_STATUS_ACCESS_DENIED;
 382         }
 383
 384         status = GUID_to_ndr_blob(&conn->smb2.server.guid, mem_ctx,
 385                                   &out_guid_blob);
 386         if (!NT_STATUS_IS_OK(status)) {
 387                 return status;
 388         }
 389
 390         *out_output = data_blob_talloc(mem_ctx, NULL, 0x18);
 391         if (out_output->data == NULL) {
 392                 return NT_STATUS_NO_MEMORY;
 393         }
 394
 395         SIVAL(out_output->data, 0x00, conn->smb2.server.capabilities);
 396         memcpy(out_output->data+0x04, out_guid_blob.data, 16);
 397         SIVAL(out_output->data, 0x14, conn->smb2.server.security_mode);
 398         SIVAL(out_output->data, 0x16, conn->smb2.server.dialect);
 399
 400         return NT_STATUS_OK;
 401 }
 402
 403 static NTSTATUS fsctl_srv_req_resume_key(TALLOC_CTX *mem_ctx,
 404                                          struct tevent_context *ev,
 405                                          struct files_struct *fsp,
 406                                          uint32_t in_max_output,
 407                                          DATA_BLOB *out_output)
 408 {
 409         struct req_resume_key_rsp rkey_rsp;
 410         enum ndr_err_code ndr_ret;
 411         DATA_BLOB output;
 412
 413         if (fsp == NULL) {
 414                 return NT_STATUS_FILE_CLOSED;
 415         }
 416
 417         ZERO_STRUCT(rkey_rsp);
 418         /* combine persistent and volatile handles for the resume key */
 419         SBVAL(rkey_rsp.resume_key, 0, fsp->op->global->open_persistent_id);
 420         SBVAL(rkey_rsp.resume_key, 8, fsp->op->global->open_volatile_id);
 421
 422         ndr_ret = ndr_push_struct_blob(&output, mem_ctx, &rkey_rsp,
 423                         (ndr_push_flags_fn_t)ndr_push_req_resume_key_rsp);
 424         if (ndr_ret != NDR_ERR_SUCCESS) {
 425                 return NT_STATUS_INTERNAL_ERROR;
 426         }
 427
 428         if (in_max_output < output.length) {
 429                 DEBUG(1, ("max output %u too small for resume key rsp %ld\n",
 430                           (unsigned int)in_max_output, (long int)output.length));
 431                 return NT_STATUS_INVALID_PARAMETER;
 432         }
 433         *out_output = output;
 434
 435         return NT_STATUS_OK;
 436 }
 437
 438 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq);
 439
 440 struct tevent_req *smb2_ioctl_network_fs(uint32_t ctl_code,
 441                                          struct tevent_context *ev,
 442                                          struct tevent_req *req,
 443                                          struct smbd_smb2_ioctl_state *state)
 444 {
 445         struct tevent_req *subreq;
 446         NTSTATUS status;
 447
 448         switch (ctl_code) {
 449         case FSCTL_SRV_COPYCHUNK:
 450                 subreq = fsctl_srv_copychunk_send(state, ev, state->fsp,
 451                                                   &state->in_input,
 452                                                   state->in_max_output,
 453                                                   state->smb2req);
 454                 if (tevent_req_nomem(subreq, req)) {
 455                         return tevent_req_post(req, ev);
 456                 }
 457                 tevent_req_set_callback(subreq,
 458                                         smb2_ioctl_network_fs_copychunk_done,
 459                                         req);
 460                 return req;
 461                 break;
 462         case FSCTL_VALIDATE_NEGOTIATE_INFO:
 463                 status = fsctl_validate_neg_info(state, ev,
 464                                                  state->smbreq->sconn->conn,
 465                                                  &state->in_input,
 466                                                  state->in_max_output,
 467                                                  &state->out_output,
 468                                                  &state->disconnect);
 469                 if (!tevent_req_nterror(req, status)) {
 470                         tevent_req_done(req);
 471                 }
 472                 return tevent_req_post(req, ev);
 473                 break;
 474         case FSCTL_SRV_REQUEST_RESUME_KEY:
 475                 status = fsctl_srv_req_resume_key(state, ev, state->fsp,
 476                                                   state->in_max_output,
 477                                                   &state->out_output);
 478                 if (!tevent_req_nterror(req, status)) {
 479                         tevent_req_done(req);
 480                 }
 481                 return tevent_req_post(req, ev);
 482                 break;
 483         default: {
 484                 uint8_t *out_data = NULL;
 485                 uint32_t out_data_len = 0;
 486
 487                 if (state->fsp == NULL) {
 488                         status = NT_STATUS_NOT_SUPPORTED;
 489                 } else {
 490                         status = SMB_VFS_FSCTL(state->fsp,
 491                                                state,
 492                                                ctl_code,
 493                                                state->smbreq->flags2,
 494                                                state->in_input.data,
 495                                                state->in_input.length,
 496                                                &out_data,
 497                                                state->in_max_output,
 498                                                &out_data_len);
 499                         state->out_output = data_blob_const(out_data, out_data_len);
 500                         if (NT_STATUS_IS_OK(status)) {
 501                                 tevent_req_done(req);
 502                                 return tevent_req_post(req, ev);
 503                         }
 504                 }
 505
 506                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 507                         if (IS_IPC(state->smbreq->conn)) {
 508                                 status = NT_STATUS_FS_DRIVER_REQUIRED;
 509                         } else {
 510                                 status = NT_STATUS_INVALID_DEVICE_REQUEST;
 511                         }
 512                 }
 513
 514                 tevent_req_nterror(req, status);
 515                 return tevent_req_post(req, ev);
 516                 break;
 517         }
 518         }
 519
 520         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
 521         return tevent_req_post(req, ev);
 522 }
 523
 524 static void smb2_ioctl_network_fs_copychunk_done(struct tevent_req *subreq)
 525 {
 526         struct tevent_req *req = tevent_req_callback_data(subreq,
 527                                                           struct tevent_req);
 528         struct smbd_smb2_ioctl_state *ioctl_state = tevent_req_data(req,
 529                                                 struct smbd_smb2_ioctl_state);
 530         struct srv_copychunk_rsp cc_rsp;
 531         NTSTATUS status;
 532         bool pack_rsp = false;
 533
 534         ZERO_STRUCT(cc_rsp);
 535         status = fsctl_srv_copychunk_recv(subreq, &cc_rsp, &pack_rsp);
 536         TALLOC_FREE(subreq);
 537         if (pack_rsp == true) {
 538                 enum ndr_err_code ndr_ret;
 539                 ndr_ret = ndr_push_struct_blob(&ioctl_state->out_output,
 540                                                ioctl_state,
 541                                                &cc_rsp,
 542                                 (ndr_push_flags_fn_t)ndr_push_srv_copychunk_rsp);
 543                 if (ndr_ret != NDR_ERR_SUCCESS) {
 544                         status = NT_STATUS_INTERNAL_ERROR;
 545                 }
 546         }
 547
 548         if (!tevent_req_nterror(req, status)) {
 549                 tevent_req_done(req);
 550         }
 551 }