source3/smbd/close.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    file closing
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 1992-2007.
   6    Copyright (C) Volker Lendecke 2005
   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 "system/filesys.h"
  24 #include "printing.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "fake_file.h"
  28 #include "transfer_file.h"
  29 #include "auth.h"
  30 #include "messages.h"
  31 #include "../librpc/gen_ndr/open_files.h"
  32
  33 /****************************************************************************
  34  Run a file if it is a magic script.
  35 ****************************************************************************/
  36
  37 static NTSTATUS check_magic(struct files_struct *fsp)
  38 {
  39         int ret;
  40         const char *magic_output = NULL;
  41         SMB_STRUCT_STAT st;
  42         int tmp_fd, outfd;
  43         TALLOC_CTX *ctx = NULL;
  44         const char *p;
  45         struct connection_struct *conn = fsp->conn;
  46         char *fname = NULL;
  47         NTSTATUS status;
  48
  49         if (!*lp_magicscript(talloc_tos(), SNUM(conn))) {
  50                 return NT_STATUS_OK;
  51         }
  52
  53         DEBUG(5,("checking magic for %s\n", fsp_str_dbg(fsp)));
  54
  55         ctx = talloc_stackframe();
  56
  57         fname = fsp->fsp_name->base_name;
  58
  59         if (!(p = strrchr_m(fname,'/'))) {
  60                 p = fname;
  61         } else {
  62                 p++;
  63         }
  64
  65         if (!strequal(lp_magicscript(talloc_tos(), SNUM(conn)),p)) {
  66                 status = NT_STATUS_OK;
  67                 goto out;
  68         }
  69
  70         if (*lp_magicoutput(talloc_tos(), SNUM(conn))) {
  71                 magic_output = lp_magicoutput(talloc_tos(), SNUM(conn));
  72         } else {
  73                 magic_output = talloc_asprintf(ctx,
  74                                 "%s.out",
  75                                 fname);
  76         }
  77         if (!magic_output) {
  78                 status = NT_STATUS_NO_MEMORY;
  79                 goto out;
  80         }
  81
  82         /* Ensure we don't depend on user's PATH. */
  83         p = talloc_asprintf(ctx, "./%s", fname);
  84         if (!p) {
  85                 status = NT_STATUS_NO_MEMORY;
  86                 goto out;
  87         }
  88
  89         if (chmod(fname, 0755) == -1) {
  90                 status = map_nt_error_from_unix(errno);
  91                 goto out;
  92         }
  93         ret = smbrun(p,&tmp_fd);
  94         DEBUG(3,("Invoking magic command %s gave %d\n",
  95                 p,ret));
  96
  97         unlink(fname);
  98         if (ret != 0 || tmp_fd == -1) {
  99                 if (tmp_fd != -1) {
 100                         close(tmp_fd);
 101                 }
 102                 status = NT_STATUS_UNSUCCESSFUL;
 103                 goto out;
 104         }
 105         outfd = open(magic_output, O_CREAT|O_EXCL|O_RDWR, 0600);
 106         if (outfd == -1) {
 107                 int err = errno;
 108                 close(tmp_fd);
 109                 status = map_nt_error_from_unix(err);
 110                 goto out;
 111         }
 112
 113         if (sys_fstat(tmp_fd, &st, false) == -1) {
 114                 int err = errno;
 115                 close(tmp_fd);
 116                 close(outfd);
 117                 status = map_nt_error_from_unix(err);
 118                 goto out;
 119         }
 120
 121         if (transfer_file(tmp_fd,outfd,(off_t)st.st_ex_size) == (off_t)-1) {
 122                 int err = errno;
 123                 close(tmp_fd);
 124                 close(outfd);
 125                 status = map_nt_error_from_unix(err);
 126                 goto out;
 127         }
 128         close(tmp_fd);
 129         if (close(outfd) == -1) {
 130                 status = map_nt_error_from_unix(errno);
 131                 goto out;
 132         }
 133
 134         status = NT_STATUS_OK;
 135
 136  out:
 137         TALLOC_FREE(ctx);
 138         return status;
 139 }
 140
 141 /****************************************************************************
 142   Common code to close a file or a directory.
 143 ****************************************************************************/
 144
 145 static NTSTATUS close_filestruct(files_struct *fsp)
 146 {
 147         NTSTATUS status = NT_STATUS_OK;
 148
 149         if (fsp->fh->fd != -1) {
 150                 if(flush_write_cache(fsp, CLOSE_FLUSH) == -1) {
 151                         status = map_nt_error_from_unix(errno);
 152                 }
 153                 delete_write_cache(fsp);
 154         }
 155
 156         return status;
 157 }
 158
 159 static int compare_share_mode_times(const void *p1, const void *p2)
 160 {
 161         const struct share_mode_entry *s1 = (const struct share_mode_entry *)p1;
 162         const struct share_mode_entry *s2 = (const struct share_mode_entry *)p2;
 163         return timeval_compare(&s1->time, &s2->time);
 164 }
 165
 166 /****************************************************************************
 167  If any deferred opens are waiting on this close, notify them.
 168 ****************************************************************************/
 169
 170 static void notify_deferred_opens(struct smbd_server_connection *sconn,
 171                                   struct share_mode_lock *lck)
 172 {
 173         struct server_id self = messaging_server_id(sconn->msg_ctx);
 174         uint32_t i, num_deferred;
 175         struct share_mode_entry *deferred;
 176
 177         if (!should_notify_deferred_opens(sconn)) {
 178                 return;
 179         }
 180
 181         num_deferred = 0;
 182         for (i=0; i<lck->data->num_share_modes; i++) {
 183                 struct share_mode_entry *e = &lck->data->share_modes[i];
 184
 185                 if (!is_deferred_open_entry(e)) {
 186                         continue;
 187                 }
 188                 if (share_mode_stale_pid(lck->data, i)) {
 189                         continue;
 190                 }
 191                 num_deferred += 1;
 192         }
 193         if (num_deferred == 0) {
 194                 return;
 195         }
 196
 197         deferred = talloc_array(talloc_tos(), struct share_mode_entry,
 198                                 num_deferred);
 199         if (deferred == NULL) {
 200                 return;
 201         }
 202
 203         num_deferred = 0;
 204         for (i=0; i<lck->data->num_share_modes; i++) {
 205                 struct share_mode_entry *e = &lck->data->share_modes[i];
 206                 if (is_deferred_open_entry(e)) {
 207                         deferred[num_deferred] = *e;
 208                         num_deferred += 1;
 209                 }
 210         }
 211
 212         /*
 213          * We need to sort the notifications by initial request time. Imagine
 214          * two opens come in asyncronously, both conflicting with the open we
 215          * just close here. If we don't sort the notifications, the one that
 216          * came in last might get the response before the one that came in
 217          * first. This is demonstrated with the smbtorture4 raw.mux test.
 218          *
 219          * As long as we had the UNUSED_SHARE_MODE_ENTRY, we happened to
 220          * survive this particular test. Without UNUSED_SHARE_MODE_ENTRY, we
 221          * shuffle the share mode entries around a bit, so that we do not
 222          * survive raw.mux anymore.
 223          *
 224          * We could have kept the ordering in del_share_mode, but as the
 225          * ordering was never formalized I think it is better to do it here
 226          * where it is necessary.
 227          */
 228
 229         qsort(deferred, num_deferred, sizeof(struct share_mode_entry),
 230               compare_share_mode_times);
 231
 232         for (i=0; i<num_deferred; i++) {
 233                 struct share_mode_entry *e = &deferred[i];
 234
 235                 if (serverid_equal(&self, &e->pid)) {
 236                         /*
 237                          * We need to notify ourself to retry the open.  Do
 238                          * this by finding the queued SMB record, moving it to
 239                          * the head of the queue and changing the wait time to
 240                          * zero.
 241                          */
 242                         schedule_deferred_open_message_smb(sconn, e->op_mid);
 243                 } else {
 244                         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
 245
 246                         share_mode_entry_to_message(msg, e);
 247
 248                         messaging_send_buf(sconn->msg_ctx, e->pid,
 249                                            MSG_SMB_OPEN_RETRY,
 250                                            (uint8 *)msg,
 251                                            MSG_SMB_SHARE_MODE_ENTRY_SIZE);
 252                 }
 253         }
 254         TALLOC_FREE(deferred);
 255 }
 256
 257 /****************************************************************************
 258  Delete all streams
 259 ****************************************************************************/
 260
 261 NTSTATUS delete_all_streams(connection_struct *conn, const char *fname)
 262 {
 263         struct stream_struct *stream_info = NULL;
 264         int i;
 265         unsigned int num_streams = 0;
 266         TALLOC_CTX *frame = talloc_stackframe();
 267         NTSTATUS status;
 268
 269         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
 270                                 &num_streams, &stream_info);
 271
 272         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)) {
 273                 DEBUG(10, ("no streams around\n"));
 274                 TALLOC_FREE(frame);
 275                 return NT_STATUS_OK;
 276         }
 277
 278         if (!NT_STATUS_IS_OK(status)) {
 279                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
 280                            nt_errstr(status)));
 281                 goto fail;
 282         }
 283
 284         DEBUG(10, ("delete_all_streams found %d streams\n",
 285                    num_streams));
 286
 287         if (num_streams == 0) {
 288                 TALLOC_FREE(frame);
 289                 return NT_STATUS_OK;
 290         }
 291
 292         for (i=0; i<num_streams; i++) {
 293                 int res;
 294                 struct smb_filename *smb_fname_stream = NULL;
 295
 296                 if (strequal(stream_info[i].name, "::$DATA")) {
 297                         continue;
 298                 }
 299
 300                 status = create_synthetic_smb_fname(talloc_tos(), fname,
 301                                                     stream_info[i].name, NULL,
 302                                                     &smb_fname_stream);
 303
 304                 if (!NT_STATUS_IS_OK(status)) {
 305                         DEBUG(0, ("talloc_aprintf failed\n"));
 306                         goto fail;
 307                 }
 308
 309                 res = SMB_VFS_UNLINK(conn, smb_fname_stream);
 310
 311                 if (res == -1) {
 312                         status = map_nt_error_from_unix(errno);
 313                         DEBUG(10, ("Could not delete stream %s: %s\n",
 314                                    smb_fname_str_dbg(smb_fname_stream),
 315                                    strerror(errno)));
 316                         TALLOC_FREE(smb_fname_stream);
 317                         break;
 318                 }
 319                 TALLOC_FREE(smb_fname_stream);
 320         }
 321
 322  fail:
 323         TALLOC_FREE(frame);
 324         return status;
 325 }
 326
 327 /****************************************************************************
 328  Deal with removing a share mode on last close.
 329 ****************************************************************************/
 330
 331 static NTSTATUS close_remove_share_mode(files_struct *fsp,
 332                                         enum file_close_type close_type)
 333 {
 334         connection_struct *conn = fsp->conn;
 335         struct server_id self = messaging_server_id(conn->sconn->msg_ctx);
 336         bool delete_file = false;
 337         bool changed_user = false;
 338         struct share_mode_lock *lck = NULL;
 339         NTSTATUS status = NT_STATUS_OK;
 340         NTSTATUS tmp_status;
 341         struct file_id id;
 342         const struct security_unix_token *del_token = NULL;
 343         const struct security_token *del_nt_token = NULL;
 344         bool got_tokens = false;
 345         bool normal_close;
 346
 347         /* Ensure any pending write time updates are done. */
 348         if (fsp->update_write_time_event) {
 349                 update_write_time_handler(fsp->conn->sconn->ev_ctx,
 350                                         fsp->update_write_time_event,
 351                                         timeval_current(),
 352                                         (void *)fsp);
 353         }
 354
 355         /*
 356          * Lock the share entries, and determine if we should delete
 357          * on close. If so delete whilst the lock is still in effect.
 358          * This prevents race conditions with the file being created. JRA.
 359          */
 360
 361         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 362         if (lck == NULL) {
 363                 DEBUG(0, ("close_remove_share_mode: Could not get share mode "
 364                           "lock for file %s\n", fsp_str_dbg(fsp)));
 365                 return NT_STATUS_INVALID_PARAMETER;
 366         }
 367
 368         if (fsp->write_time_forced) {
 369                 DEBUG(10,("close_remove_share_mode: write time forced "
 370                         "for file %s\n",
 371                         fsp_str_dbg(fsp)));
 372                 set_close_write_time(fsp, lck->data->changed_write_time);
 373         } else if (fsp->update_write_time_on_close) {
 374                 /* Someone had a pending write. */
 375                 if (null_timespec(fsp->close_write_time)) {
 376                         DEBUG(10,("close_remove_share_mode: update to current time "
 377                                 "for file %s\n",
 378                                 fsp_str_dbg(fsp)));
 379                         /* Update to current time due to "normal" write. */
 380                         set_close_write_time(fsp, timespec_current());
 381                 } else {
 382                         DEBUG(10,("close_remove_share_mode: write time pending "
 383                                 "for file %s\n",
 384                                 fsp_str_dbg(fsp)));
 385                         /* Update to time set on close call. */
 386                         set_close_write_time(fsp, fsp->close_write_time);
 387                 }
 388         }
 389
 390         if (fsp->initial_delete_on_close &&
 391                         !is_delete_on_close_set(lck, fsp->name_hash)) {
 392                 bool became_user = False;
 393
 394                 /* Initial delete on close was set and no one else
 395                  * wrote a real delete on close. */
 396
 397                 if (get_current_vuid(conn) != fsp->vuid) {
 398                         become_user(conn, fsp->vuid);
 399                         became_user = True;
 400                 }
 401                 fsp->delete_on_close = true;
 402                 set_delete_on_close_lck(fsp, lck, True,
 403                                 get_current_nttok(conn),
 404                                 get_current_utok(conn));
 405                 if (became_user) {
 406                         unbecome_user();
 407                 }
 408         }
 409
 410         delete_file = is_delete_on_close_set(lck, fsp->name_hash);
 411
 412         if (delete_file) {
 413                 int i;
 414                 /* See if others still have the file open via this pathname.
 415                    If this is the case, then don't delete. If all opens are
 416                    POSIX delete now. */
 417                 for (i=0; i<lck->data->num_share_modes; i++) {
 418                         struct share_mode_entry *e = &lck->data->share_modes[i];
 419
 420                         if (!is_valid_share_mode_entry(e)) {
 421                                 continue;
 422                         }
 423                         if (e->name_hash != fsp->name_hash) {
 424                                 continue;
 425                         }
 426                         if (fsp->posix_open
 427                             && (e->flags & SHARE_MODE_FLAG_POSIX_OPEN)) {
 428                                 continue;
 429                         }
 430                         if (serverid_equal(&self, &e->pid) &&
 431                             (e->share_file_id == fsp->fh->gen_id)) {
 432                                 continue;
 433                         }
 434                         if (share_mode_stale_pid(lck->data, i)) {
 435                                 continue;
 436                         }
 437                         delete_file = False;
 438                         break;
 439                 }
 440         }
 441
 442         /* Notify any deferred opens waiting on this close. */
 443         notify_deferred_opens(conn->sconn, lck);
 444         reply_to_oplock_break_requests(fsp);
 445
 446         /*
 447          * NT can set delete_on_close of the last open
 448          * reference to a file.
 449          */
 450
 451         normal_close = (close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE);
 452
 453         if (!normal_close || !delete_file) {
 454
 455                 if (!del_share_mode(lck, fsp)) {
 456                         DEBUG(0, ("close_remove_share_mode: Could not delete "
 457                                   "share entry for file %s\n",
 458                                   fsp_str_dbg(fsp)));
 459                 }
 460
 461                 TALLOC_FREE(lck);
 462                 return NT_STATUS_OK;
 463         }
 464
 465         /*
 466          * Ok, we have to delete the file
 467          */
 468
 469         DEBUG(5,("close_remove_share_mode: file %s. Delete on close was set "
 470                  "- deleting file.\n", fsp_str_dbg(fsp)));
 471
 472         /*
 473          * Don't try to update the write time when we delete the file
 474          */
 475         fsp->update_write_time_on_close = false;
 476
 477         got_tokens = get_delete_on_close_token(lck, fsp->name_hash,
 478                                         &del_nt_token, &del_token);
 479         SMB_ASSERT(got_tokens);
 480
 481         if (!unix_token_equal(del_token, get_current_utok(conn))) {
 482                 /* Become the user who requested the delete. */
 483
 484                 DEBUG(5,("close_remove_share_mode: file %s. "
 485                         "Change user to uid %u\n",
 486                         fsp_str_dbg(fsp),
 487                         (unsigned int)del_token->uid));
 488
 489                 if (!push_sec_ctx()) {
 490                         smb_panic("close_remove_share_mode: file %s. failed to push "
 491                                   "sec_ctx.\n");
 492                 }
 493
 494                 set_sec_ctx(del_token->uid,
 495                             del_token->gid,
 496                             del_token->ngroups,
 497                             del_token->groups,
 498                             del_nt_token);
 499
 500                 changed_user = true;
 501         }
 502
 503         /* We can only delete the file if the name we have is still valid and
 504            hasn't been renamed. */
 505
 506         tmp_status = vfs_stat_fsp(fsp);
 507         if (!NT_STATUS_IS_OK(tmp_status)) {
 508                 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
 509                          "was set and stat failed with error %s\n",
 510                          fsp_str_dbg(fsp), nt_errstr(tmp_status)));
 511                 /*
 512                  * Don't save the errno here, we ignore this error
 513                  */
 514                 goto done;
 515         }
 516
 517         id = vfs_file_id_from_sbuf(conn, &fsp->fsp_name->st);
 518
 519         if (!file_id_equal(&fsp->file_id, &id)) {
 520                 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
 521                          "was set and dev and/or inode does not match\n",
 522                          fsp_str_dbg(fsp)));
 523                 DEBUG(5,("close_remove_share_mode: file %s. stored file_id %s, "
 524                          "stat file_id %s\n",
 525                          fsp_str_dbg(fsp),
 526                          file_id_string_tos(&fsp->file_id),
 527                          file_id_string_tos(&id)));
 528                 /*
 529                  * Don't save the errno here, we ignore this error
 530                  */
 531                 goto done;
 532         }
 533
 534         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
 535             && !is_ntfs_stream_smb_fname(fsp->fsp_name)) {
 536
 537                 status = delete_all_streams(conn, fsp->fsp_name->base_name);
 538
 539                 if (!NT_STATUS_IS_OK(status)) {
 540                         DEBUG(5, ("delete_all_streams failed: %s\n",
 541                                   nt_errstr(status)));
 542                         goto done;
 543                 }
 544         }
 545
 546
 547         if (SMB_VFS_UNLINK(conn, fsp->fsp_name) != 0) {
 548                 /*
 549                  * This call can potentially fail as another smbd may
 550                  * have had the file open with delete on close set and
 551                  * deleted it when its last reference to this file
 552                  * went away. Hence we log this but not at debug level
 553                  * zero.
 554                  */
 555
 556                 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
 557                          "was set and unlink failed with error %s\n",
 558                          fsp_str_dbg(fsp), strerror(errno)));
 559
 560                 status = map_nt_error_from_unix(errno);
 561         }
 562
 563         /* As we now have POSIX opens which can unlink
 564          * with other open files we may have taken
 565          * this code path with more than one share mode
 566          * entry - ensure we only delete once by resetting
 567          * the delete on close flag. JRA.
 568          */
 569
 570         fsp->delete_on_close = false;
 571         set_delete_on_close_lck(fsp, lck, false, NULL, NULL);
 572
 573  done:
 574
 575         if (changed_user) {
 576                 /* unbecome user. */
 577                 pop_sec_ctx();
 578         }
 579
 580         if (!del_share_mode(lck, fsp)) {
 581                 DEBUG(0, ("close_remove_share_mode: Could not delete share "
 582                           "entry for file %s\n", fsp_str_dbg(fsp)));
 583         }
 584
 585         TALLOC_FREE(lck);
 586
 587         if (delete_file) {
 588                 /*
 589                  * Do the notification after we released the share
 590                  * mode lock. Inside notify_fname we take out another
 591                  * tdb lock. With ctdb also accessing our databases,
 592                  * this can lead to deadlocks. Putting this notify
 593                  * after the TALLOC_FREE(lck) above we avoid locking
 594                  * two records simultaneously. Notifies are async and
 595                  * informational only, so calling the notify_fname
 596                  * without holding the share mode lock should not do
 597                  * any harm.
 598                  */
 599                 notify_fname(conn, NOTIFY_ACTION_REMOVED,
 600                              FILE_NOTIFY_CHANGE_FILE_NAME,
 601                              fsp->fsp_name->base_name);
 602         }
 603
 604         return status;
 605 }
 606
 607 void set_close_write_time(struct files_struct *fsp, struct timespec ts)
 608 {
 609         DEBUG(6,("close_write_time: %s" , time_to_asc(convert_timespec_to_time_t(ts))));
 610
 611         if (null_timespec(ts)) {
 612                 return;
 613         }
 614         fsp->write_time_forced = false;
 615         fsp->update_write_time_on_close = true;
 616         fsp->close_write_time = ts;
 617 }
 618
 619 static NTSTATUS update_write_time_on_close(struct files_struct *fsp)
 620 {
 621         struct smb_file_time ft;
 622         NTSTATUS status;
 623         struct share_mode_lock *lck = NULL;
 624
 625         ZERO_STRUCT(ft);
 626
 627         if (!fsp->update_write_time_on_close) {
 628                 return NT_STATUS_OK;
 629         }
 630
 631         if (null_timespec(fsp->close_write_time)) {
 632                 fsp->close_write_time = timespec_current();
 633         }
 634
 635         /* Ensure we have a valid stat struct for the source. */
 636         status = vfs_stat_fsp(fsp);
 637         if (!NT_STATUS_IS_OK(status)) {
 638                 return status;
 639         }
 640
 641         if (!VALID_STAT(fsp->fsp_name->st)) {
 642                 /* if it doesn't seem to be a real file */
 643                 return NT_STATUS_OK;
 644         }
 645
 646         /*
 647          * get_existing_share_mode_lock() isn't really the right
 648          * call here, as we're being called after
 649          * close_remove_share_mode() inside close_normal_file()
 650          * so it's quite normal to not have an existing share
 651          * mode here. However, get_share_mode_lock() doesn't
 652          * work because that will create a new share mode if
 653          * one doesn't exist - so stick with this call (just
 654          * ignore any error we get if the share mode doesn't
 655          * exist.
 656          */
 657
 658         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
 659         if (lck) {
 660                 /* On close if we're changing the real file time we
 661                  * must update it in the open file db too. */
 662                 (void)set_write_time(fsp->file_id, fsp->close_write_time);
 663
 664                 /* Close write times overwrite sticky write times
 665                    so we must replace any sticky write time here. */
 666                 if (!null_timespec(lck->data->changed_write_time)) {
 667                         (void)set_sticky_write_time(fsp->file_id, fsp->close_write_time);
 668                 }
 669                 TALLOC_FREE(lck);
 670         }
 671
 672         ft.mtime = fsp->close_write_time;
 673         /* As this is a close based update, we are not directly changing the
 674            file attributes from a client call, but indirectly from a write. */
 675         status = smb_set_file_time(fsp->conn, fsp, fsp->fsp_name, &ft, false);
 676         if (!NT_STATUS_IS_OK(status)) {
 677                 DEBUG(10,("update_write_time_on_close: smb_set_file_time "
 678                         "on file %s returned %s\n",
 679                         fsp_str_dbg(fsp),
 680                         nt_errstr(status)));
 681                 return status;
 682         }
 683
 684         return status;
 685 }
 686
 687 static NTSTATUS ntstatus_keeperror(NTSTATUS s1, NTSTATUS s2)
 688 {
 689         if (!NT_STATUS_IS_OK(s1)) {
 690                 return s1;
 691         }
 692         return s2;
 693 }
 694
 695 /****************************************************************************
 696  Close a file.
 697
 698  close_type can be NORMAL_CLOSE=0,SHUTDOWN_CLOSE,ERROR_CLOSE.
 699  printing and magic scripts are only run on normal close.
 700  delete on close is done on normal and shutdown close.
 701 ****************************************************************************/
 702
 703 static NTSTATUS close_normal_file(struct smb_request *req, files_struct *fsp,
 704                                   enum file_close_type close_type)
 705 {
 706         NTSTATUS status = NT_STATUS_OK;
 707         NTSTATUS tmp;
 708         connection_struct *conn = fsp->conn;
 709
 710         if (fsp->num_aio_requests != 0) {
 711                 /*
 712                  * reply_close and the smb2 close must have taken care of
 713                  * this. No other callers of close_file should ever have
 714                  * created async I/O.
 715                  *
 716                  * We need to panic here because if we close() the fd while we
 717                  * have outstanding async I/O requests, in the worst case we
 718                  * could end up writing to the wrong file.
 719                  */
 720                 DEBUG(0, ("fsp->num_aio_requests=%u\n",
 721                           fsp->num_aio_requests));
 722                 smb_panic("can not close with outstanding aio requests");
 723         }
 724
 725         /*
 726          * If we're flushing on a close we can get a write
 727          * error here, we must remember this.
 728          */
 729
 730         tmp = close_filestruct(fsp);
 731         status = ntstatus_keeperror(status, tmp);
 732
 733         if (fsp->print_file) {
 734                 /* FIXME: return spool errors */
 735                 print_spool_end(fsp, close_type);
 736                 file_free(req, fsp);
 737                 return NT_STATUS_OK;
 738         }
 739
 740         /* Remove the oplock before potentially deleting the file. */
 741         if(fsp->oplock_type) {
 742                 release_file_oplock(fsp);
 743         }
 744
 745         /* If this is an old DOS or FCB open and we have multiple opens on
 746            the same handle we only have one share mode. Ensure we only remove
 747            the share mode on the last close. */
 748
 749         if (fsp->fh->ref_count == 1) {
 750                 /* Should we return on error here... ? */
 751                 tmp = close_remove_share_mode(fsp, close_type);
 752                 status = ntstatus_keeperror(status, tmp);
 753         }
 754
 755         locking_close_file(conn->sconn->msg_ctx, fsp, close_type);
 756
 757         tmp = fd_close(fsp);
 758         status = ntstatus_keeperror(status, tmp);
 759
 760         /* check for magic scripts */
 761         if (close_type == NORMAL_CLOSE) {
 762                 tmp = check_magic(fsp);
 763                 status = ntstatus_keeperror(status, tmp);
 764         }
 765
 766         /*
 767          * Ensure pending modtime is set after close.
 768          */
 769
 770         tmp = update_write_time_on_close(fsp);
 771         if (NT_STATUS_EQUAL(tmp, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 772                 /* Someone renamed the file or a parent directory containing
 773                  * this file. We can't do anything about this, we don't have
 774                  * an "update timestamp by fd" call in POSIX. Eat the error. */
 775
 776                 tmp = NT_STATUS_OK;
 777         }
 778
 779         status = ntstatus_keeperror(status, tmp);
 780
 781         DEBUG(2,("%s closed file %s (numopen=%d) %s\n",
 782                 conn->session_info->unix_info->unix_name, fsp_str_dbg(fsp),
 783                 conn->num_files_open - 1,
 784                 nt_errstr(status) ));
 785
 786         file_free(req, fsp);
 787         return status;
 788 }
 789 /****************************************************************************
 790  Static function used by reply_rmdir to delete an entire directory
 791  tree recursively. Return True on ok, False on fail.
 792 ****************************************************************************/
 793
 794 static bool recursive_rmdir(TALLOC_CTX *ctx,
 795                         connection_struct *conn,
 796                         struct smb_filename *smb_dname)
 797 {
 798         const char *dname = NULL;
 799         char *talloced = NULL;
 800         bool ret = True;
 801         long offset = 0;
 802         SMB_STRUCT_STAT st;
 803         struct smb_Dir *dir_hnd;
 804
 805         SMB_ASSERT(!is_ntfs_stream_smb_fname(smb_dname));
 806
 807         dir_hnd = OpenDir(talloc_tos(), conn, smb_dname->base_name, NULL, 0);
 808         if(dir_hnd == NULL)
 809                 return False;
 810
 811         while((dname = ReadDirName(dir_hnd, &offset, &st, &talloced))) {
 812                 struct smb_filename *smb_dname_full = NULL;
 813                 char *fullname = NULL;
 814                 bool do_break = true;
 815                 NTSTATUS status;
 816
 817                 if (ISDOT(dname) || ISDOTDOT(dname)) {
 818                         TALLOC_FREE(talloced);
 819                         continue;
 820                 }
 821
 822                 if (!is_visible_file(conn, smb_dname->base_name, dname, &st,
 823                                      false)) {
 824                         TALLOC_FREE(talloced);
 825                         continue;
 826                 }
 827
 828                 /* Construct the full name. */
 829                 fullname = talloc_asprintf(ctx,
 830                                 "%s/%s",
 831                                 smb_dname->base_name,
 832                                 dname);
 833                 if (!fullname) {
 834                         errno = ENOMEM;
 835                         goto err_break;
 836                 }
 837
 838                 status = create_synthetic_smb_fname(talloc_tos(), fullname,
 839                                                     NULL, NULL,
 840                                                     &smb_dname_full);
 841                 if (!NT_STATUS_IS_OK(status)) {
 842                         goto err_break;
 843                 }
 844
 845                 if(SMB_VFS_LSTAT(conn, smb_dname_full) != 0) {
 846                         goto err_break;
 847                 }
 848
 849                 if(smb_dname_full->st.st_ex_mode & S_IFDIR) {
 850                         if(!recursive_rmdir(ctx, conn, smb_dname_full)) {
 851                                 goto err_break;
 852                         }
 853                         if(SMB_VFS_RMDIR(conn,
 854                                          smb_dname_full->base_name) != 0) {
 855                                 goto err_break;
 856                         }
 857                 } else if(SMB_VFS_UNLINK(conn, smb_dname_full) != 0) {
 858                         goto err_break;
 859                 }
 860
 861                 /* Successful iteration. */
 862                 do_break = false;
 863
 864          err_break:
 865                 TALLOC_FREE(smb_dname_full);
 866                 TALLOC_FREE(fullname);
 867                 TALLOC_FREE(talloced);
 868                 if (do_break) {
 869                         ret = false;
 870                         break;
 871                 }
 872         }
 873         TALLOC_FREE(dir_hnd);
 874         return ret;
 875 }
 876
 877 /****************************************************************************
 878  The internals of the rmdir code - called elsewhere.
 879 ****************************************************************************/
 880
 881 static NTSTATUS rmdir_internals(TALLOC_CTX *ctx, files_struct *fsp)
 882 {
 883         connection_struct *conn = fsp->conn;
 884         struct smb_filename *smb_dname = fsp->fsp_name;
 885         int ret;
 886
 887         SMB_ASSERT(!is_ntfs_stream_smb_fname(smb_dname));
 888
 889         /* Might be a symlink. */
 890         if(SMB_VFS_LSTAT(conn, smb_dname) != 0) {
 891                 return map_nt_error_from_unix(errno);
 892         }
 893
 894         if (S_ISLNK(smb_dname->st.st_ex_mode)) {
 895                 /* Is what it points to a directory ? */
 896                 if(SMB_VFS_STAT(conn, smb_dname) != 0) {
 897                         return map_nt_error_from_unix(errno);
 898                 }
 899                 if (!(S_ISDIR(smb_dname->st.st_ex_mode))) {
 900                         return NT_STATUS_NOT_A_DIRECTORY;
 901                 }
 902                 ret = SMB_VFS_UNLINK(conn, smb_dname);
 903         } else {
 904                 ret = SMB_VFS_RMDIR(conn, smb_dname->base_name);
 905         }
 906         if (ret == 0) {
 907                 notify_fname(conn, NOTIFY_ACTION_REMOVED,
 908                              FILE_NOTIFY_CHANGE_DIR_NAME,
 909                              smb_dname->base_name);
 910                 return NT_STATUS_OK;
 911         }
 912
 913         if(((errno == ENOTEMPTY)||(errno == EEXIST)) && *lp_veto_files(talloc_tos(), SNUM(conn))) {
 914                 /*
 915                  * Check to see if the only thing in this directory are
 916                  * vetoed files/directories. If so then delete them and
 917                  * retry. If we fail to delete any of them (and we *don't*
 918                  * do a recursive delete) then fail the rmdir.
 919                  */
 920                 SMB_STRUCT_STAT st;
 921                 const char *dname = NULL;
 922                 char *talloced = NULL;
 923                 long dirpos = 0;
 924                 struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn,
 925                                                   smb_dname->base_name, NULL,
 926                                                   0);
 927
 928                 if(dir_hnd == NULL) {
 929                         errno = ENOTEMPTY;
 930                         goto err;
 931                 }
 932
 933                 while ((dname = ReadDirName(dir_hnd, &dirpos, &st,
 934                                             &talloced)) != NULL) {
 935                         if((strcmp(dname, ".") == 0) || (strcmp(dname, "..")==0)) {
 936                                 TALLOC_FREE(talloced);
 937                                 continue;
 938                         }
 939                         if (!is_visible_file(conn, smb_dname->base_name, dname,
 940                                              &st, false)) {
 941                                 TALLOC_FREE(talloced);
 942                                 continue;
 943                         }
 944                         if(!IS_VETO_PATH(conn, dname)) {
 945                                 TALLOC_FREE(dir_hnd);
 946                                 TALLOC_FREE(talloced);
 947                                 errno = ENOTEMPTY;
 948                                 goto err;
 949                         }
 950                         TALLOC_FREE(talloced);
 951                 }
 952
 953                 /* We only have veto files/directories.
 954                  * Are we allowed to delete them ? */
 955
 956                 if(!lp_recursive_veto_delete(SNUM(conn))) {
 957                         TALLOC_FREE(dir_hnd);
 958                         errno = ENOTEMPTY;
 959                         goto err;
 960                 }
 961
 962                 /* Do a recursive delete. */
 963                 RewindDir(dir_hnd,&dirpos);
 964                 while ((dname = ReadDirName(dir_hnd, &dirpos, &st,
 965                                             &talloced)) != NULL) {
 966                         struct smb_filename *smb_dname_full = NULL;
 967                         char *fullname = NULL;
 968                         bool do_break = true;
 969                         NTSTATUS status;
 970
 971                         if (ISDOT(dname) || ISDOTDOT(dname)) {
 972                                 TALLOC_FREE(talloced);
 973                                 continue;
 974                         }
 975                         if (!is_visible_file(conn, smb_dname->base_name, dname,
 976                                              &st, false)) {
 977                                 TALLOC_FREE(talloced);
 978                                 continue;
 979                         }
 980
 981                         fullname = talloc_asprintf(ctx,
 982                                         "%s/%s",
 983                                         smb_dname->base_name,
 984                                         dname);
 985
 986                         if(!fullname) {
 987                                 errno = ENOMEM;
 988                                 goto err_break;
 989                         }
 990
 991                         status = create_synthetic_smb_fname(talloc_tos(),
 992                                                             fullname, NULL,
 993                                                             NULL,
 994                                                             &smb_dname_full);
 995                         if (!NT_STATUS_IS_OK(status)) {
 996                                 errno = map_errno_from_nt_status(status);
 997                                 goto err_break;
 998                         }
 999
1000                         if(SMB_VFS_LSTAT(conn, smb_dname_full) != 0) {
1001                                 goto err_break;
1002                         }
1003                         if(smb_dname_full->st.st_ex_mode & S_IFDIR) {
1004                                 if(!recursive_rmdir(ctx, conn,
1005                                                     smb_dname_full)) {
1006                                         goto err_break;
1007                                 }
1008                                 if(SMB_VFS_RMDIR(conn,
1009                                         smb_dname_full->base_name) != 0) {
1010                                         goto err_break;
1011                                 }
1012                         } else if(SMB_VFS_UNLINK(conn, smb_dname_full) != 0) {
1013                                 goto err_break;
1014                         }
1015
1016                         /* Successful iteration. */
1017                         do_break = false;
1018
1019                  err_break:
1020                         TALLOC_FREE(fullname);
1021                         TALLOC_FREE(smb_dname_full);
1022                         TALLOC_FREE(talloced);
1023                         if (do_break)
1024                                 break;
1025                 }
1026                 TALLOC_FREE(dir_hnd);
1027                 /* Retry the rmdir */
1028                 ret = SMB_VFS_RMDIR(conn, smb_dname->base_name);
1029         }
1030
1031   err:
1032
1033         if (ret != 0) {
1034                 DEBUG(3,("rmdir_internals: couldn't remove directory %s : "
1035                          "%s\n", smb_fname_str_dbg(smb_dname),
1036                          strerror(errno)));
1037                 return map_nt_error_from_unix(errno);
1038         }
1039
1040         notify_fname(conn, NOTIFY_ACTION_REMOVED,
1041                      FILE_NOTIFY_CHANGE_DIR_NAME,
1042                      smb_dname->base_name);
1043
1044         return NT_STATUS_OK;
1045 }
1046
1047 /****************************************************************************
1048  Close a directory opened by an NT SMB call.
1049 ****************************************************************************/
1050
1051 static NTSTATUS close_directory(struct smb_request *req, files_struct *fsp,
1052                                 enum file_close_type close_type)
1053 {
1054         struct server_id self = messaging_server_id(fsp->conn->sconn->msg_ctx);
1055         struct share_mode_lock *lck = NULL;
1056         bool delete_dir = False;
1057         NTSTATUS status = NT_STATUS_OK;
1058         NTSTATUS status1 = NT_STATUS_OK;
1059         const struct security_token *del_nt_token = NULL;
1060         const struct security_unix_token *del_token = NULL;
1061
1062         /*
1063          * NT can set delete_on_close of the last open
1064          * reference to a directory also.
1065          */
1066
1067         lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
1068         if (lck == NULL) {
1069                 DEBUG(0, ("close_directory: Could not get share mode lock for "
1070                           "%s\n", fsp_str_dbg(fsp)));
1071                 return NT_STATUS_INVALID_PARAMETER;
1072         }
1073
1074         if (fsp->initial_delete_on_close) {
1075                 bool became_user = False;
1076
1077                 /* Initial delete on close was set - for
1078                  * directories we don't care if anyone else
1079                  * wrote a real delete on close. */
1080
1081                 if (get_current_vuid(fsp->conn) != fsp->vuid) {
1082                         become_user(fsp->conn, fsp->vuid);
1083                         became_user = True;
1084                 }
1085                 send_stat_cache_delete_message(fsp->conn->sconn->msg_ctx,
1086                                                fsp->fsp_name->base_name);
1087                 set_delete_on_close_lck(fsp, lck, true,
1088                                 get_current_nttok(fsp->conn),
1089                                 get_current_utok(fsp->conn));
1090                 fsp->delete_on_close = true;
1091                 if (became_user) {
1092                         unbecome_user();
1093                 }
1094         }
1095
1096         delete_dir = get_delete_on_close_token(lck, fsp->name_hash,
1097                                         &del_nt_token, &del_token);
1098
1099         if (delete_dir) {
1100                 int i;
1101                 /* See if others still have the dir open. If this is the
1102                  * case, then don't delete. If all opens are POSIX delete now. */
1103                 for (i=0; i<lck->data->num_share_modes; i++) {
1104                         struct share_mode_entry *e = &lck->data->share_modes[i];
1105                         if (is_valid_share_mode_entry(e) &&
1106                                         e->name_hash == fsp->name_hash) {
1107                                 if (fsp->posix_open && (e->flags & SHARE_MODE_FLAG_POSIX_OPEN)) {
1108                                         continue;
1109                                 }
1110                                 if (serverid_equal(&self, &e->pid) &&
1111                                     (e->share_file_id == fsp->fh->gen_id)) {
1112                                         continue;
1113                                 }
1114                                 if (share_mode_stale_pid(lck->data, i)) {
1115                                         continue;
1116                                 }
1117                                 delete_dir = False;
1118                                 break;
1119                         }
1120                 }
1121         }
1122
1123         if ((close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE) &&
1124                                 delete_dir) {
1125
1126                 /* Become the user who requested the delete. */
1127
1128                 if (!push_sec_ctx()) {
1129                         smb_panic("close_directory: failed to push sec_ctx.\n");
1130                 }
1131
1132                 set_sec_ctx(del_token->uid,
1133                                 del_token->gid,
1134                                 del_token->ngroups,
1135                                 del_token->groups,
1136                                 del_nt_token);
1137
1138                 if (!del_share_mode(lck, fsp)) {
1139                         DEBUG(0, ("close_directory: Could not delete share entry for "
1140                                   "%s\n", fsp_str_dbg(fsp)));
1141                 }
1142
1143                 TALLOC_FREE(lck);
1144
1145                 if ((fsp->conn->fs_capabilities & FILE_NAMED_STREAMS)
1146                     && !is_ntfs_stream_smb_fname(fsp->fsp_name)) {
1147
1148                         status = delete_all_streams(fsp->conn, fsp->fsp_name->base_name);
1149                         if (!NT_STATUS_IS_OK(status)) {
1150                                 DEBUG(5, ("delete_all_streams failed: %s\n",
1151                                           nt_errstr(status)));
1152                                 return status;
1153                         }
1154                 }
1155
1156                 status = rmdir_internals(talloc_tos(), fsp);
1157
1158                 DEBUG(5,("close_directory: %s. Delete on close was set - "
1159                          "deleting directory returned %s.\n",
1160                          fsp_str_dbg(fsp), nt_errstr(status)));
1161
1162                 /* unbecome user. */
1163                 pop_sec_ctx();
1164
1165                 /*
1166                  * Ensure we remove any change notify requests that would
1167                  * now fail as the directory has been deleted.
1168                  */
1169
1170                 if(NT_STATUS_IS_OK(status)) {
1171                         remove_pending_change_notify_requests_by_fid(fsp, NT_STATUS_DELETE_PENDING);
1172                 }
1173         } else {
1174                 if (!del_share_mode(lck, fsp)) {
1175                         DEBUG(0, ("close_directory: Could not delete share entry for "
1176                                   "%s\n", fsp_str_dbg(fsp)));
1177                 }
1178
1179                 TALLOC_FREE(lck);
1180                 remove_pending_change_notify_requests_by_fid(
1181                         fsp, NT_STATUS_OK);
1182         }
1183
1184         status1 = fd_close(fsp);
1185
1186         if (!NT_STATUS_IS_OK(status1)) {
1187                 DEBUG(0, ("Could not close dir! fname=%s, fd=%d, err=%d=%s\n",
1188                           fsp_str_dbg(fsp), fsp->fh->fd, errno,
1189                           strerror(errno)));
1190         }
1191
1192         /*
1193          * Do the code common to files and directories.
1194          */
1195         close_filestruct(fsp);
1196         file_free(req, fsp);
1197
1198         if (NT_STATUS_IS_OK(status) && !NT_STATUS_IS_OK(status1)) {
1199                 status = status1;
1200         }
1201         return status;
1202 }
1203
1204 /****************************************************************************
1205  Close a files_struct.
1206 ****************************************************************************/
1207
1208 NTSTATUS close_file(struct smb_request *req, files_struct *fsp,
1209                     enum file_close_type close_type)
1210 {
1211         NTSTATUS status;
1212         struct files_struct *base_fsp = fsp->base_fsp;
1213
1214         if(fsp->is_directory) {
1215                 status = close_directory(req, fsp, close_type);
1216         } else if (fsp->fake_file_handle != NULL) {
1217                 status = close_fake_file(req, fsp);
1218         } else {
1219                 status = close_normal_file(req, fsp, close_type);
1220         }
1221
1222         if ((base_fsp != NULL) && (close_type != SHUTDOWN_CLOSE)) {
1223
1224                 /*
1225                  * fsp was a stream, the base fsp can't be a stream as well
1226                  *
1227                  * For SHUTDOWN_CLOSE this is not possible here, because
1228                  * SHUTDOWN_CLOSE only happens from files.c which walks the
1229                  * complete list of files. If we mess with more than one fsp
1230                  * those loops will become confused.
1231                  */
1232
1233                 SMB_ASSERT(base_fsp->base_fsp == NULL);
1234                 close_file(req, base_fsp, close_type);
1235         }
1236
1237         return status;
1238 }
1239
1240 /****************************************************************************
1241  Deal with an (authorized) message to close a file given the share mode
1242  entry.
1243 ****************************************************************************/
1244
1245 void msg_close_file(struct messaging_context *msg_ctx,
1246                         void *private_data,
1247                         uint32_t msg_type,
1248                         struct server_id server_id,
1249                         DATA_BLOB *data)
1250 {
1251         files_struct *fsp = NULL;
1252         struct share_mode_entry e;
1253         struct smbd_server_connection *sconn =
1254                 talloc_get_type_abort(private_data,
1255                 struct smbd_server_connection);
1256
1257         message_to_share_mode_entry(&e, (char *)data->data);
1258
1259         if(DEBUGLVL(10)) {
1260                 char *sm_str = share_mode_str(NULL, 0, &e);
1261                 if (!sm_str) {
1262                         smb_panic("talloc failed");
1263                 }
1264                 DEBUG(10,("msg_close_file: got request to close share mode "
1265                         "entry %s\n", sm_str));
1266                 TALLOC_FREE(sm_str);
1267         }
1268
1269         fsp = file_find_dif(sconn, e.id, e.share_file_id);
1270         if (!fsp) {
1271                 DEBUG(10,("msg_close_file: failed to find file.\n"));
1272                 return;
1273         }
1274         close_file(NULL, fsp, NORMAL_CLOSE);
1275 }