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