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