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                                 bool posix_open,
 157                                 struct timespec *out_creation_ts,
 158                                 struct timespec *out_last_access_ts,
 159                                 struct timespec *out_last_write_ts,
 160                                 struct timespec *out_change_ts,
 161                                 uint16_t *out_flags,
 162                                 uint64_t *out_allocation_size,
 163                                 uint64_t *out_end_of_file,
 164                                 uint32_t *out_file_attributes)
 165 {
 166         NTSTATUS status;
 167         int ret;
 168
 169         status = openat_pathref_fsp(conn->cwd_fsp, smb_fname);
 170         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 171             (smb_fname->flags & SMB_FILENAME_POSIX_PATH) &&
 172             S_ISLNK(smb_fname->st.st_ex_mode))
 173         {
 174                 status = NT_STATUS_OK;
 175         }
 176         if (!NT_STATUS_IS_OK(status)) {
 177                 return;
 178         }
 179
 180         if (posix_open) {
 181                 ret = SMB_VFS_LSTAT(conn, smb_fname);
 182         } else {
 183                 ret = SMB_VFS_STAT(conn, smb_fname);
 184         }
 185         if (ret != 0) {
 186                 return;
 187         }
 188
 189         *out_flags = SMB2_CLOSE_FLAGS_FULL_INFORMATION;
 190         *out_file_attributes = fdos_mode(smb_fname->fsp);
 191         *out_last_write_ts = smb_fname->st.st_ex_mtime;
 192         *out_last_access_ts = smb_fname->st.st_ex_atime;
 193         *out_creation_ts = get_create_timespec(conn, NULL, smb_fname);
 194         *out_change_ts = get_change_timespec(conn, NULL, smb_fname);
 195
 196         if (lp_dos_filetime_resolution(SNUM(conn))) {
 197                 dos_filetime_timespec(out_creation_ts);
 198                 dos_filetime_timespec(out_last_write_ts);
 199                 dos_filetime_timespec(out_last_access_ts);
 200                 dos_filetime_timespec(out_change_ts);
 201         }
 202         if (!(*out_file_attributes & FILE_ATTRIBUTE_DIRECTORY)) {
 203                 *out_end_of_file = get_file_size_stat(&smb_fname->st);
 204         }
 205
 206         *out_allocation_size = SMB_VFS_GET_ALLOC_SIZE(conn, NULL, &smb_fname->st);
 207 }
 208
 209 static NTSTATUS smbd_smb2_close(struct smbd_smb2_request *req,
 210                                 struct files_struct *fsp,
 211                                 uint16_t in_flags,
 212                                 uint16_t *out_flags,
 213                                 struct timespec *out_creation_ts,
 214                                 struct timespec *out_last_access_ts,
 215                                 struct timespec *out_last_write_ts,
 216                                 struct timespec *out_change_ts,
 217                                 uint64_t *out_allocation_size,
 218                                 uint64_t *out_end_of_file,
 219                                 uint32_t *out_file_attributes)
 220 {
 221         NTSTATUS status;
 222         struct smb_request *smbreq;
 223         connection_struct *conn = req->tcon->compat;
 224         struct smb_filename *smb_fname = NULL;
 225         uint64_t allocation_size = 0;
 226         uint64_t file_size = 0;
 227         uint32_t dos_attrs = 0;
 228         uint16_t flags = 0;
 229         bool posix_open = false;
 230
 231         *out_creation_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 232         *out_last_access_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 233         *out_last_write_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 234         *out_change_ts = (struct timespec){0, SAMBA_UTIME_OMIT};
 235
 236         *out_flags = 0;
 237         *out_allocation_size = 0;
 238         *out_end_of_file = 0;
 239         *out_file_attributes = 0;
 240
 241         DEBUG(10,("smbd_smb2_close: %s - %s\n",
 242                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 243
 244         smbreq = smbd_smb2_fake_smb_request(req);
 245         if (smbreq == NULL) {
 246                 return NT_STATUS_NO_MEMORY;
 247         }
 248
 249         posix_open = (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN);
 250         smb_fname = cp_smb_filename(talloc_tos(), fsp->fsp_name);
 251         if (smb_fname == NULL) {
 252                 return NT_STATUS_NO_MEMORY;
 253         }
 254
 255         if ((in_flags & SMB2_CLOSE_FLAGS_FULL_INFORMATION) &&
 256             (fsp->fsp_flags.initial_delete_on_close ||
 257              fsp->fsp_flags.delete_on_close))
 258         {
 259                 /*
 260                  * We might be deleting the file. Ensure we
 261                  * return valid data from before the file got
 262                  * removed.
 263                  */
 264                 setup_close_full_information(conn,
 265                                 smb_fname,
 266                                 posix_open,
 267                                 out_creation_ts,
 268                                 out_last_access_ts,
 269                                 out_last_write_ts,
 270                                 out_change_ts,
 271                                 &flags,
 272                                 &allocation_size,
 273                                 &file_size,
 274                                 &dos_attrs);
 275         }
 276
 277         status = close_file(smbreq, fsp, NORMAL_CLOSE);
 278         if (!NT_STATUS_IS_OK(status)) {
 279                 DEBUG(5,("smbd_smb2_close: close_file[%s]: %s\n",
 280                          smb_fname_str_dbg(smb_fname), nt_errstr(status)));
 281                 return status;
 282         }
 283
 284         if (in_flags & SMB2_CLOSE_FLAGS_FULL_INFORMATION) {
 285                 setup_close_full_information(conn,
 286                                 smb_fname,
 287                                 posix_open,
 288                                 out_creation_ts,
 289                                 out_last_access_ts,
 290                                 out_last_write_ts,
 291                                 out_change_ts,
 292                                 &flags,
 293                                 &allocation_size,
 294                                 &file_size,
 295                                 &dos_attrs);
 296         }
 297
 298         *out_flags = flags;
 299         *out_allocation_size = allocation_size;
 300         *out_end_of_file = file_size;
 301         *out_file_attributes = dos_attrs;
 302
 303         return NT_STATUS_OK;
 304 }
 305
 306 struct smbd_smb2_close_state {
 307         struct smbd_smb2_request *smb2req;
 308         struct files_struct *in_fsp;
 309         uint16_t in_flags;
 310         uint16_t out_flags;
 311         struct timespec out_creation_ts;
 312         struct timespec out_last_access_ts;
 313         struct timespec out_last_write_ts;
 314         struct timespec out_change_ts;
 315         uint64_t out_allocation_size;
 316         uint64_t out_end_of_file;
 317         uint32_t out_file_attributes;
 318         struct tevent_queue *wait_queue;
 319 };
 320
 321 static void smbd_smb2_close_wait_done(struct tevent_req *subreq);
 322
 323 static struct tevent_req *smbd_smb2_close_send(TALLOC_CTX *mem_ctx,
 324                                                struct tevent_context *ev,
 325                                                struct smbd_smb2_request *smb2req,
 326                                                struct files_struct *in_fsp,
 327                                                uint16_t in_flags)
 328 {
 329         struct tevent_req *req;
 330         struct smbd_smb2_close_state *state;
 331         unsigned i;
 332         NTSTATUS status;
 333
 334         req = tevent_req_create(mem_ctx, &state,
 335                                 struct smbd_smb2_close_state);
 336         if (req == NULL) {
 337                 return NULL;
 338         }
 339         state->smb2req = smb2req;
 340         state->in_fsp = in_fsp;
 341         state->in_flags = in_flags;
 342
 343         in_fsp->fsp_flags.closing = true;
 344
 345         i = 0;
 346         while (i < in_fsp->num_aio_requests) {
 347                 bool ok = tevent_req_cancel(in_fsp->aio_requests[i]);
 348                 if (ok) {
 349                         continue;
 350                 }
 351                 i += 1;
 352         }
 353
 354         if (in_fsp->num_aio_requests != 0) {
 355                 struct tevent_req *subreq;
 356
 357                 state->wait_queue = tevent_queue_create(state,
 358                                         "smbd_smb2_close_send_wait_queue");
 359                 if (tevent_req_nomem(state->wait_queue, req)) {
 360                         return tevent_req_post(req, ev);
 361                 }
 362                 /*
 363                  * Now wait until all aio requests on this fsp are
 364                  * finished.
 365                  *
 366                  * We don't set a callback, as we just want to block the
 367                  * wait queue and the talloc_free() of fsp->aio_request
 368                  * will remove the item from the wait queue.
 369                  */
 370                 subreq = tevent_queue_wait_send(in_fsp->aio_requests,
 371                                         smb2req->sconn->ev_ctx,
 372                                         state->wait_queue);
 373                 if (tevent_req_nomem(subreq, req)) {
 374                         return tevent_req_post(req, ev);
 375                 }
 376
 377                 /*
 378                  * Now we add our own waiter to the end of the queue,
 379                  * this way we get notified when all pending requests are
 380                  * finished.
 381                  */
 382                 subreq = tevent_queue_wait_send(state,
 383                                         smb2req->sconn->ev_ctx,
 384                                         state->wait_queue);
 385                 if (tevent_req_nomem(subreq, req)) {
 386                         return tevent_req_post(req, ev);
 387                 }
 388
 389                 tevent_req_set_callback(subreq, smbd_smb2_close_wait_done, req);
 390                 return req;
 391         }
 392
 393         status = smbd_smb2_close(smb2req,
 394                                  state->in_fsp,
 395                                  state->in_flags,
 396                                  &state->out_flags,
 397                                  &state->out_creation_ts,
 398                                  &state->out_last_access_ts,
 399                                  &state->out_last_write_ts,
 400                                  &state->out_change_ts,
 401                                  &state->out_allocation_size,
 402                                  &state->out_end_of_file,
 403                                  &state->out_file_attributes);
 404         if (tevent_req_nterror(req, status)) {
 405                 return tevent_req_post(req, ev);
 406         }
 407
 408         tevent_req_done(req);
 409         return tevent_req_post(req, ev);
 410 }
 411
 412 static void smbd_smb2_close_wait_done(struct tevent_req *subreq)
 413 {
 414         struct tevent_req *req = tevent_req_callback_data(
 415                 subreq, struct tevent_req);
 416         struct smbd_smb2_close_state *state = tevent_req_data(
 417                 req, struct smbd_smb2_close_state);
 418         NTSTATUS status;
 419
 420         tevent_queue_wait_recv(subreq);
 421         TALLOC_FREE(subreq);
 422
 423         status = smbd_smb2_close(state->smb2req,
 424                                  state->in_fsp,
 425                                  state->in_flags,
 426                                  &state->out_flags,
 427                                  &state->out_creation_ts,
 428                                  &state->out_last_access_ts,
 429                                  &state->out_last_write_ts,
 430                                  &state->out_change_ts,
 431                                  &state->out_allocation_size,
 432                                  &state->out_end_of_file,
 433                                  &state->out_file_attributes);
 434         if (tevent_req_nterror(req, status)) {
 435                 return;
 436         }
 437         tevent_req_done(req);
 438 }
 439
 440 static NTSTATUS smbd_smb2_close_recv(struct tevent_req *req,
 441                                      uint16_t *out_flags,
 442                                      struct timespec *out_creation_ts,
 443                                      struct timespec *out_last_access_ts,
 444                                      struct timespec *out_last_write_ts,
 445                                      struct timespec *out_change_ts,
 446                                      uint64_t *out_allocation_size,
 447                                      uint64_t *out_end_of_file,
 448                                      uint32_t *out_file_attributes)
 449 {
 450         struct smbd_smb2_close_state *state =
 451                 tevent_req_data(req,
 452                 struct smbd_smb2_close_state);
 453         NTSTATUS status;
 454
 455         if (tevent_req_is_nterror(req, &status)) {
 456                 tevent_req_received(req);
 457                 return status;
 458         }
 459
 460         *out_flags = state->out_flags;
 461         *out_creation_ts = state->out_creation_ts;
 462         *out_last_access_ts = state->out_last_access_ts;
 463         *out_last_write_ts = state->out_last_write_ts;
 464         *out_change_ts = state->out_change_ts;
 465         *out_allocation_size = state->out_allocation_size;
 466         *out_end_of_file = state->out_end_of_file;
 467         *out_file_attributes = state->out_file_attributes;
 468
 469         tevent_req_received(req);
 470         return NT_STATUS_OK;
 471 }