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