source3/smbd/smb2_close.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
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_SMB2
  29
  30 static struct tevent_req *smbd_smb2_close_send(TALLOC_CTX *mem_ctx,
  31                                                struct tevent_context *ev,
  32                                                struct smbd_smb2_request *smb2req,
  33                                                struct files_struct *in_fsp,
  34                                                uint16_t in_flags);
  35 static NTSTATUS smbd_smb2_close_recv(struct tevent_req *req,
  36                                      uint16_t *out_flags,
  37                                      struct timespec *out_creation_ts,
  38                                      struct timespec *out_last_access_ts,
  39                                      struct timespec *out_last_write_ts,
  40                                      struct timespec *out_change_ts,
  41                                      uint64_t *out_allocation_size,
  42                                      uint64_t *out_end_of_file,
  43                                      uint32_t *out_file_attributes);
  44
  45 static void smbd_smb2_request_close_done(struct tevent_req *subreq);
  46
  47 NTSTATUS smbd_smb2_request_process_close(struct smbd_smb2_request *req)
  48 {
  49         const uint8_t *inbody;
  50         uint16_t in_flags;
  51         uint64_t in_file_id_persistent;
  52         uint64_t in_file_id_volatile;
  53         struct files_struct *in_fsp;
  54         NTSTATUS status;
  55         struct tevent_req *subreq;
  56
  57         status = smbd_smb2_request_verify_sizes(req, 0x18);
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 return smbd_smb2_request_error(req, status);
  60         }
  61         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  62
  63         in_flags                = SVAL(inbody, 0x02);
  64         in_file_id_persistent   = BVAL(inbody, 0x08);
  65         in_file_id_volatile     = BVAL(inbody, 0x10);
  66
  67         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  68         if (in_fsp == NULL) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  70         }
  71
  72         subreq = smbd_smb2_close_send(req, req->sconn->ev_ctx,
  73                                       req, in_fsp, in_flags);
  74         if (subreq == NULL) {
  75                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  76         }
  77         tevent_req_set_callback(subreq, smbd_smb2_request_close_done, req);
  78
  79         return smbd_smb2_request_pending_queue(req, subreq, 500);
  80 }
  81
  82 static void smbd_smb2_request_close_done(struct tevent_req *subreq)
  83 {
  84         struct smbd_smb2_request *req =
  85                 tevent_req_callback_data(subreq,
  86                 struct smbd_smb2_request);
  87         DATA_BLOB outbody;
  88         uint16_t out_flags = 0;
  89         connection_struct *conn = req->tcon->compat;
  90         struct timespec out_creation_ts = { 0, };
  91         struct timespec out_last_access_ts = { 0, };
  92         struct timespec out_last_write_ts = { 0, };
  93         struct timespec out_change_ts = { 0, };
  94         uint64_t out_allocation_size = 0;
  95         uint64_t out_end_of_file = 0;
  96         uint32_t out_file_attributes = 0;
  97         NTSTATUS status;
  98         NTSTATUS error;
  99
 100         status = smbd_smb2_close_recv(subreq,
 101                                       &out_flags,
 102                                       &out_creation_ts,
 103                                       &out_last_access_ts,
 104                                       &out_last_write_ts,
 105                                       &out_change_ts,
 106                                       &out_allocation_size,
 107                                       &out_end_of_file,
 108                                       &out_file_attributes);
 109         TALLOC_FREE(subreq);
 110         if (!NT_STATUS_IS_OK(status)) {
 111                 error = smbd_smb2_request_error(req, status);
 112                 if (!NT_STATUS_IS_OK(error)) {
 113                         smbd_server_connection_terminate(req->xconn,
 114                                                          nt_errstr(error));
 115                         return;
 116                 }
 117                 return;
 118         }
 119
 120         outbody = smbd_smb2_generate_outbody(req, 0x3C);
 121         if (outbody.data == NULL) {
 122                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 123                 if (!NT_STATUS_IS_OK(error)) {
 124                         smbd_server_connection_terminate(req->xconn,
 125                                                          nt_errstr(error));
 126                         return;
 127                 }
 128                 return;
 129         }
 130
 131         SSVAL(outbody.data, 0x00, 0x3C);        /* struct size */
 132         SSVAL(outbody.data, 0x02, out_flags);
 133         SIVAL(outbody.data, 0x04, 0);           /* reserved */
 134         put_long_date_full_timespec(conn->ts_res,
 135                 (char *)outbody.data + 0x08, &out_creation_ts);
 136         put_long_date_full_timespec(conn->ts_res,
 137                 (char *)outbody.data + 0x10, &out_last_access_ts);
 138         put_long_date_full_timespec(conn->ts_res,
 139                 (char *)outbody.data + 0x18, &out_last_write_ts);
 140         put_long_date_full_timespec(conn->ts_res,
 141                 (char *)outbody.data + 0x20, &out_change_ts);
 142         SBVAL(outbody.data, 0x28, out_allocation_size);
 143         SBVAL(outbody.data, 0x30, out_end_of_file);
 144         SIVAL(outbody.data, 0x38, out_file_attributes);
 145
 146         error = smbd_smb2_request_done(req, outbody, NULL);
 147         if (!NT_STATUS_IS_OK(error)) {
 148                 smbd_server_connection_terminate(req->xconn,
 149                                                  nt_errstr(error));
 150                 return;
 151         }
 152 }
 153
 154 static void setup_close_full_information(connection_struct *conn,
 155                                 struct smb_filename *smb_fname,
 156                                 struct timespec *out_creation_ts,
 157                                 struct timespec *out_last_access_ts,
 158                                 struct timespec *out_last_write_ts,
 159                                 struct timespec *out_change_ts,
 160                                 uint16_t *out_flags,
 161                                 uint64_t *out_allocation_size,
 162                                 uint64_t *out_end_of_file)
 163 {
 164         *out_flags = SMB2_CLOSE_FLAGS_FULL_INFORMATION;
 165         *out_last_write_ts = smb_fname->st.st_ex_mtime;
 166         *out_last_access_ts = smb_fname->st.st_ex_atime;
 167         *out_creation_ts = get_create_timespec(conn, NULL, smb_fname);
 168         *out_change_ts = get_change_timespec(conn, NULL, smb_fname);
 169
 170         if (lp_dos_filetime_resolution(SNUM(conn))) {
 171                 dos_filetime_timespec(out_creation_ts);
 172                 dos_filetime_timespec(out_last_write_ts);
 173                 dos_filetime_timespec(out_last_access_ts);
 174                 dos_filetime_timespec(out_change_ts);
 175         }
 176         if (!S_ISDIR(smb_fname->st.st_ex_mode)) {
 177                 *out_end_of_file = get_file_size_stat(&smb_fname->st);
 178         }
 179
 180         *out_allocation_size = SMB_VFS_GET_ALLOC_SIZE(conn, NULL, &smb_fname->st);
 181 }
 182
 183 static NTSTATUS smbd_smb2_close(struct smbd_smb2_request *req,
 184                                 struct files_struct **_fsp,
 185                                 uint16_t in_flags,
 186                                 uint16_t *out_flags,
 187                                 struct timespec *out_creation_ts,
 188                                 struct timespec *out_last_access_ts,
 189                                 struct timespec *out_last_write_ts,
 190                                 struct timespec *out_change_ts,
 191                                 uint64_t *out_allocation_size,
 192                                 uint64_t *out_end_of_file,
 193                                 uint32_t *out_file_attributes)
 194 {
 195         NTSTATUS status;
 196         struct smb_request *smbreq;
 197         connection_struct *conn = req->tcon->compat;
 198         struct files_struct *fsp = *_fsp;
 199         struct smb_filename *smb_fname = NULL;
 200
 201         *out_creation_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 202         *out_last_access_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 203         *out_last_write_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 204         *out_change_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 205
 206         *out_flags = 0;
 207         *out_allocation_size = 0;
 208         *out_end_of_file = 0;
 209         *out_file_attributes = 0;
 210
 211         DEBUG(10,("smbd_smb2_close: %s - %s\n",
 212                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 213
 214         smbreq = smbd_smb2_fake_smb_request(req, fsp);
 215         if (smbreq == NULL) {
 216                 return NT_STATUS_NO_MEMORY;
 217         }
 218
 219         if (in_flags & SMB2_CLOSE_FLAGS_FULL_INFORMATION) {
 220                 *out_file_attributes = fdos_mode(fsp);
 221                 fsp->fsp_flags.fstat_before_close = true;
 222         }
 223
 224         status = close_file_smb(smbreq, fsp, NORMAL_CLOSE);
 225         if (!NT_STATUS_IS_OK(status)) {
 226                 DEBUG(5,("smbd_smb2_close: close_file[%s]: %s\n",
 227                          smb_fname_str_dbg(smb_fname), nt_errstr(status)));
 228                 file_free(smbreq, fsp);
 229                 *_fsp = fsp = NULL;
 230                 return status;
 231         }
 232
 233         if (in_flags & SMB2_CLOSE_FLAGS_FULL_INFORMATION) {
 234                 setup_close_full_information(conn,
 235                                 fsp->fsp_name,
 236                                 out_creation_ts,
 237                                 out_last_access_ts,
 238                                 out_last_write_ts,
 239                                 out_change_ts,
 240                                 out_flags,
 241                                 out_allocation_size,
 242                                 out_end_of_file);
 243         }
 244
 245         file_free(smbreq, fsp);
 246         *_fsp = fsp = NULL;
 247         return NT_STATUS_OK;
 248 }
 249
 250 struct smbd_smb2_close_state {
 251         struct smbd_smb2_request *smb2req;
 252         struct files_struct *in_fsp;
 253         uint16_t in_flags;
 254         uint16_t out_flags;
 255         struct timespec out_creation_ts;
 256         struct timespec out_last_access_ts;
 257         struct timespec out_last_write_ts;
 258         struct timespec out_change_ts;
 259         uint64_t out_allocation_size;
 260         uint64_t out_end_of_file;
 261         uint32_t out_file_attributes;
 262         struct tevent_queue *wait_queue;
 263 };
 264
 265 static void smbd_smb2_close_wait_done(struct tevent_req *subreq);
 266 static void smbd_smb2_close_delay_lease_break_done(struct tevent_req *subreq);
 267
 268 static struct tevent_req *smbd_smb2_close_send(TALLOC_CTX *mem_ctx,
 269                                                struct tevent_context *ev,
 270                                                struct smbd_smb2_request *smb2req,
 271                                                struct files_struct *in_fsp,
 272                                                uint16_t in_flags)
 273 {
 274         struct tevent_req *req;
 275         struct smbd_smb2_close_state *state;
 276         const char *fsp_name_str = NULL;
 277         const char *fsp_fnum_str = NULL;
 278         unsigned i;
 279         NTSTATUS status;
 280
 281         if (CHECK_DEBUGLVL(DBGLVL_INFO)) {
 282                 fsp_name_str = fsp_str_dbg(in_fsp);
 283                 fsp_fnum_str = fsp_fnum_dbg(in_fsp);
 284         }
 285
 286         DBG_DEBUG("%s - %s\n", fsp_name_str, fsp_fnum_str);
 287
 288         req = tevent_req_create(mem_ctx, &state,
 289                                 struct smbd_smb2_close_state);
 290         if (req == NULL) {
 291                 return NULL;
 292         }
 293         state->smb2req = smb2req;
 294         state->in_fsp = in_fsp;
 295         state->in_flags = in_flags;
 296
 297         in_fsp->fsp_flags.closing = true;
 298
 299         i = 0;
 300         while (i < in_fsp->num_aio_requests) {
 301                 bool ok = tevent_req_cancel(in_fsp->aio_requests[i]);
 302                 if (ok) {
 303                         continue;
 304                 }
 305                 i += 1;
 306         }
 307
 308         if (in_fsp->num_aio_requests != 0) {
 309                 struct tevent_req *subreq;
 310
 311                 state->wait_queue = tevent_queue_create(state,
 312                                         "smbd_smb2_close_send_wait_queue");
 313                 if (tevent_req_nomem(state->wait_queue, req)) {
 314                         return tevent_req_post(req, ev);
 315                 }
 316                 /*
 317                  * Now wait until all aio requests on this fsp are
 318                  * finished.
 319                  *
 320                  * We don't set a callback, as we just want to block the
 321                  * wait queue and the talloc_free() of fsp->aio_request
 322                  * will remove the item from the wait queue.
 323                  */
 324                 subreq = tevent_queue_wait_send(in_fsp->aio_requests,
 325                                         smb2req->sconn->ev_ctx,
 326                                         state->wait_queue);
 327                 if (tevent_req_nomem(subreq, req)) {
 328                         return tevent_req_post(req, ev);
 329                 }
 330
 331                 /*
 332                  * Now we add our own waiter to the end of the queue,
 333                  * this way we get notified when all pending requests are
 334                  * finished.
 335                  */
 336                 subreq = tevent_queue_wait_send(state,
 337                                         smb2req->sconn->ev_ctx,
 338                                         state->wait_queue);
 339                 if (tevent_req_nomem(subreq, req)) {
 340                         return tevent_req_post(req, ev);
 341                 }
 342
 343                 tevent_req_set_callback(subreq, smbd_smb2_close_wait_done, req);
 344                 return req;
 345         }
 346
 347         if (in_fsp->fsp_flags.initial_delete_on_close) {
 348                 struct tevent_req *subreq = NULL;
 349                 struct share_mode_lock *lck = NULL;
 350                 struct timeval timeout;
 351
 352                 lck = get_existing_share_mode_lock(mem_ctx,
 353                                                    in_fsp->file_id);
 354                 if (lck == NULL) {
 355                         tevent_req_nterror(req,
 356                                            NT_STATUS_UNSUCCESSFUL);
 357                         return tevent_req_post(req, ev);
 358                 }
 359
 360                 if (is_delete_on_close_set(lck, in_fsp->name_hash)) {
 361                         TALLOC_FREE(lck);
 362                         goto do_close;
 363                 }
 364
 365                 timeout = tevent_timeval_set(OPLOCK_BREAK_TIMEOUT, 0);
 366                 timeout = timeval_sum(&smb2req->request_time, &timeout);
 367
 368                 subreq = delay_for_handle_lease_break_send(req,
 369                                                            ev,
 370                                                            timeout,
 371                                                            in_fsp,
 372                                                            false,
 373                                                            &lck);
 374                 if (tevent_req_nomem(subreq, req)) {
 375                         TALLOC_FREE(lck);
 376                         return tevent_req_post(req, ev);
 377                 }
 378                 if (tevent_req_is_in_progress(subreq)) {
 379                         tevent_req_set_callback(
 380                                 subreq,
 381                                 smbd_smb2_close_delay_lease_break_done,
 382                                 req);
 383                         return req;
 384                 }
 385
 386                 status = delay_for_handle_lease_break_recv(subreq,
 387                                                            mem_ctx,
 388                                                            &lck);
 389                 TALLOC_FREE(subreq);
 390                 TALLOC_FREE(lck);
 391                 if (tevent_req_nterror(req, status)) {
 392                         return tevent_req_post(req, ev);
 393                 }
 394                 /* Fall through */
 395         }
 396
 397 do_close:
 398         status = smbd_smb2_close(smb2req,
 399                                  &state->in_fsp,
 400                                  state->in_flags,
 401                                  &state->out_flags,
 402                                  &state->out_creation_ts,
 403                                  &state->out_last_access_ts,
 404                                  &state->out_last_write_ts,
 405                                  &state->out_change_ts,
 406                                  &state->out_allocation_size,
 407                                  &state->out_end_of_file,
 408                                  &state->out_file_attributes);
 409         if (tevent_req_nterror(req, status)) {
 410                 DBG_INFO("%s - %s: close file failed: %s\n",
 411                          fsp_name_str, fsp_fnum_str,
 412                          nt_errstr(status));
 413                 return tevent_req_post(req, ev);
 414         }
 415
 416         tevent_req_done(req);
 417         return tevent_req_post(req, ev);
 418 }
 419
 420 static void smbd_smb2_close_wait_done(struct tevent_req *subreq)
 421 {
 422         struct tevent_req *req = tevent_req_callback_data(
 423                 subreq, struct tevent_req);
 424         struct smbd_smb2_close_state *state = tevent_req_data(
 425                 req, struct smbd_smb2_close_state);
 426         NTSTATUS status;
 427
 428         tevent_queue_wait_recv(subreq);
 429         TALLOC_FREE(subreq);
 430
 431         status = smbd_smb2_close(state->smb2req,
 432                                  &state->in_fsp,
 433                                  state->in_flags,
 434                                  &state->out_flags,
 435                                  &state->out_creation_ts,
 436                                  &state->out_last_access_ts,
 437                                  &state->out_last_write_ts,
 438                                  &state->out_change_ts,
 439                                  &state->out_allocation_size,
 440                                  &state->out_end_of_file,
 441                                  &state->out_file_attributes);
 442         if (tevent_req_nterror(req, status)) {
 443                 return;
 444         }
 445         tevent_req_done(req);
 446 }
 447
 448 static void smbd_smb2_close_delay_lease_break_done(struct tevent_req *subreq)
 449 {
 450         struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req);
 451         struct smbd_smb2_close_state *state = tevent_req_data(
 452                 req, struct smbd_smb2_close_state);
 453         struct share_mode_lock *lck = NULL;
 454         NTSTATUS status;
 455         bool ok;
 456
 457         status = delay_for_handle_lease_break_recv(subreq, state, &lck);
 458         TALLOC_FREE(subreq);
 459         TALLOC_FREE(lck);
 460         if (tevent_req_nterror(req, status)) {
 461                 return;
 462         }
 463
 464         /*
 465          * Make sure we run as the user again
 466          */
 467         ok = change_to_user_and_service(
 468                 state->smb2req->tcon->compat,
 469                 state->smb2req->session->global->session_wire_id);
 470         if (!ok) {
 471                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 472                 return;
 473         }
 474
 475         status = smbd_smb2_close(state->smb2req,
 476                                  &state->in_fsp,
 477                                  state->in_flags,
 478                                  &state->out_flags,
 479                                  &state->out_creation_ts,
 480                                  &state->out_last_access_ts,
 481                                  &state->out_last_write_ts,
 482                                  &state->out_change_ts,
 483                                  &state->out_allocation_size,
 484                                  &state->out_end_of_file,
 485                                  &state->out_file_attributes);
 486         if (tevent_req_nterror(req, status)) {
 487                 return;
 488         }
 489         tevent_req_done(req);
 490 }
 491
 492 static NTSTATUS smbd_smb2_close_recv(struct tevent_req *req,
 493                                      uint16_t *out_flags,
 494                                      struct timespec *out_creation_ts,
 495                                      struct timespec *out_last_access_ts,
 496                                      struct timespec *out_last_write_ts,
 497                                      struct timespec *out_change_ts,
 498                                      uint64_t *out_allocation_size,
 499                                      uint64_t *out_end_of_file,
 500                                      uint32_t *out_file_attributes)
 501 {
 502         struct smbd_smb2_close_state *state =
 503                 tevent_req_data(req,
 504                 struct smbd_smb2_close_state);
 505         NTSTATUS status;
 506
 507         if (tevent_req_is_nterror(req, &status)) {
 508                 tevent_req_received(req);
 509                 return status;
 510         }
 511
 512         *out_flags = state->out_flags;
 513         *out_creation_ts = state->out_creation_ts;
 514         *out_last_access_ts = state->out_last_access_ts;
 515         *out_last_write_ts = state->out_last_write_ts;
 516         *out_change_ts = state->out_change_ts;
 517         *out_allocation_size = state->out_allocation_size;
 518         *out_end_of_file = state->out_end_of_file;
 519         *out_file_attributes = state->out_file_attributes;
 520
 521         tevent_req_received(req);
 522         return NT_STATUS_OK;
 523 }