source3/smbd/open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    file opening and share modes
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2004
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Ralph Boehme 2017
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "lib/util/server_id.h"
  26 #include "printing.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "fake_file.h"
  30 #include "../libcli/security/security.h"
  31 #include "../librpc/gen_ndr/ndr_security.h"
  32 #include "../librpc/gen_ndr/ndr_open_files.h"
  33 #include "../librpc/gen_ndr/idmap.h"
  34 #include "../librpc/gen_ndr/ioctl.h"
  35 #include "passdb/lookup_sid.h"
  36 #include "auth.h"
  37 #include "serverid.h"
  38 #include "messages.h"
  39 #include "source3/lib/dbwrap/dbwrap_watch.h"
  40 #include "locking/leases_db.h"
  41 #include "librpc/gen_ndr/ndr_leases_db.h"
  42
  43 extern const struct generic_mapping file_generic_mapping;
  44
  45 struct deferred_open_record {
  46         bool delayed_for_oplocks;
  47         bool async_open;
  48         struct file_id id;
  49
  50         /*
  51          * Timer for async opens, needed because they don't use a watch on
  52          * a locking.tdb record. This is currently only used for real async
  53          * opens and just terminates smbd if the async open times out.
  54          */
  55         struct tevent_timer *te;
  56 };
  57
  58 /****************************************************************************
  59  If the requester wanted DELETE_ACCESS and was rejected because
  60  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  61  overrides this.
  62 ****************************************************************************/
  63
  64 static bool parent_override_delete(connection_struct *conn,
  65                                         const struct smb_filename *smb_fname,
  66                                         uint32_t access_mask,
  67                                         uint32_t rejected_mask)
  68 {
  69         if ((access_mask & DELETE_ACCESS) &&
  70                     (rejected_mask & DELETE_ACCESS) &&
  71                     can_delete_file_in_directory(conn, smb_fname)) {
  72                 return true;
  73         }
  74         return false;
  75 }
  76
  77 /****************************************************************************
  78  Check if we have open rights.
  79 ****************************************************************************/
  80
  81 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  82                                 const struct smb_filename *smb_fname,
  83                                 bool use_privs,
  84                                 uint32_t access_mask)
  85 {
  86         /* Check if we have rights to open. */
  87         NTSTATUS status;
  88         struct security_descriptor *sd = NULL;
  89         uint32_t rejected_share_access;
  90         uint32_t rejected_mask = access_mask;
  91         uint32_t do_not_check_mask = 0;
  92
  93         rejected_share_access = access_mask & ~(conn->share_access);
  94
  95         if (rejected_share_access) {
  96                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  97                         "on %s (0x%x)\n",
  98                         (unsigned int)access_mask,
  99                         smb_fname_str_dbg(smb_fname),
 100                         (unsigned int)rejected_share_access ));
 101                 return NT_STATUS_ACCESS_DENIED;
 102         }
 103
 104         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
 105                 /* I'm sorry sir, I didn't know you were root... */
 106                 DEBUG(10,("smbd_check_access_rights: root override "
 107                         "on %s. Granting 0x%x\n",
 108                         smb_fname_str_dbg(smb_fname),
 109                         (unsigned int)access_mask ));
 110                 return NT_STATUS_OK;
 111         }
 112
 113         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 114                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 115                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 116                         smb_fname_str_dbg(smb_fname),
 117                         (unsigned int)access_mask ));
 118                 return NT_STATUS_OK;
 119         }
 120
 121         if (access_mask == DELETE_ACCESS &&
 122                         VALID_STAT(smb_fname->st) &&
 123                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 124                 /* We can always delete a symlink. */
 125                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 126                         "on DELETE_ACCESS on symlink %s.\n",
 127                         smb_fname_str_dbg(smb_fname) ));
 128                 return NT_STATUS_OK;
 129         }
 130
 131         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
 132                         (SECINFO_OWNER |
 133                         SECINFO_GROUP |
 134                          SECINFO_DACL), talloc_tos(), &sd);
 135
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 138                         "on %s: %s\n",
 139                         smb_fname_str_dbg(smb_fname),
 140                         nt_errstr(status)));
 141
 142                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 143                         goto access_denied;
 144                 }
 145
 146                 return status;
 147         }
 148
 149         /*
 150          * If we can access the path to this file, by
 151          * default we have FILE_READ_ATTRIBUTES from the
 152          * containing directory. See the section:
 153          * "Algorithm to Check Access to an Existing File"
 154          * in MS-FSA.pdf.
 155          *
 156          * se_file_access_check() also takes care of
 157          * owner WRITE_DAC and READ_CONTROL.
 158          */
 159         do_not_check_mask = FILE_READ_ATTRIBUTES;
 160
 161         /*
 162          * Samba 3.6 and earlier granted execute access even
 163          * if the ACL did not contain execute rights.
 164          * Samba 4.0 is more correct and checks it.
 165          * The compatibilty mode allows one to skip this check
 166          * to smoothen upgrades.
 167          */
 168         if (lp_acl_allow_execute_always(SNUM(conn))) {
 169                 do_not_check_mask |= FILE_EXECUTE;
 170         }
 171
 172         status = se_file_access_check(sd,
 173                                 get_current_nttok(conn),
 174                                 use_privs,
 175                                 (access_mask & ~do_not_check_mask),
 176                                 &rejected_mask);
 177
 178         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 179                 "0x%x returning 0x%x (%s)\n",
 180                 smb_fname_str_dbg(smb_fname),
 181                 (unsigned int)access_mask,
 182                 (unsigned int)rejected_mask,
 183                 nt_errstr(status) ));
 184
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 if (DEBUGLEVEL >= 10) {
 187                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 188                                 smb_fname_str_dbg(smb_fname) ));
 189                         NDR_PRINT_DEBUG(security_descriptor, sd);
 190                 }
 191         }
 192
 193         TALLOC_FREE(sd);
 194
 195         if (NT_STATUS_IS_OK(status) ||
 196                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 197                 return status;
 198         }
 199
 200         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 201
 202   access_denied:
 203
 204         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 205                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 206                         !lp_store_dos_attributes(SNUM(conn)) &&
 207                         (lp_map_readonly(SNUM(conn)) ||
 208                         lp_map_archive(SNUM(conn)) ||
 209                         lp_map_hidden(SNUM(conn)) ||
 210                         lp_map_system(SNUM(conn)))) {
 211                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 212
 213                 DEBUG(10,("smbd_check_access_rights: "
 214                         "overrode "
 215                         "FILE_WRITE_ATTRIBUTES "
 216                         "on file %s\n",
 217                         smb_fname_str_dbg(smb_fname)));
 218         }
 219
 220         if (parent_override_delete(conn,
 221                                 smb_fname,
 222                                 access_mask,
 223                                 rejected_mask)) {
 224                 /* Were we trying to do an open
 225                  * for delete and didn't get DELETE
 226                  * access (only) ? Check if the
 227                  * directory allows DELETE_CHILD.
 228                  * See here:
 229                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 230                  * for details. */
 231
 232                 rejected_mask &= ~DELETE_ACCESS;
 233
 234                 DEBUG(10,("smbd_check_access_rights: "
 235                         "overrode "
 236                         "DELETE_ACCESS on "
 237                         "file %s\n",
 238                         smb_fname_str_dbg(smb_fname)));
 239         }
 240
 241         if (rejected_mask != 0) {
 242                 return NT_STATUS_ACCESS_DENIED;
 243         }
 244         return NT_STATUS_OK;
 245 }
 246
 247 NTSTATUS check_parent_access(struct connection_struct *conn,
 248                                 struct smb_filename *smb_fname,
 249                                 uint32_t access_mask)
 250 {
 251         NTSTATUS status;
 252         char *parent_dir = NULL;
 253         struct security_descriptor *parent_sd = NULL;
 254         uint32_t access_granted = 0;
 255         struct smb_filename *parent_smb_fname = NULL;
 256         struct share_mode_lock *lck = NULL;
 257         struct file_id id = {0};
 258         uint32_t name_hash;
 259         bool delete_on_close_set;
 260         int ret;
 261         TALLOC_CTX *frame = talloc_stackframe();
 262
 263         if (!parent_dirname(frame,
 264                                 smb_fname->base_name,
 265                                 &parent_dir,
 266                                 NULL)) {
 267                 status = NT_STATUS_NO_MEMORY;
 268                 goto out;
 269         }
 270
 271         parent_smb_fname = synthetic_smb_fname(frame,
 272                                 parent_dir,
 273                                 NULL,
 274                                 NULL,
 275                                 smb_fname->flags);
 276         if (parent_smb_fname == NULL) {
 277                 status = NT_STATUS_NO_MEMORY;
 278                 goto out;
 279         }
 280
 281         if (get_current_uid(conn) == (uid_t)0) {
 282                 /* I'm sorry sir, I didn't know you were root... */
 283                 DEBUG(10,("check_parent_access: root override "
 284                         "on %s. Granting 0x%x\n",
 285                         smb_fname_str_dbg(smb_fname),
 286                         (unsigned int)access_mask ));
 287                 status = NT_STATUS_OK;
 288                 goto out;
 289         }
 290
 291         status = SMB_VFS_GET_NT_ACL(conn,
 292                                 parent_smb_fname,
 293                                 SECINFO_DACL,
 294                                 frame,
 295                                 &parent_sd);
 296
 297         if (!NT_STATUS_IS_OK(status)) {
 298                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 299                         "%s with error %s\n",
 300                         parent_dir,
 301                         nt_errstr(status)));
 302                 goto out;
 303         }
 304
 305         /*
 306          * If we can access the path to this file, by
 307          * default we have FILE_READ_ATTRIBUTES from the
 308          * containing directory. See the section:
 309          * "Algorithm to Check Access to an Existing File"
 310          * in MS-FSA.pdf.
 311          *
 312          * se_file_access_check() also takes care of
 313          * owner WRITE_DAC and READ_CONTROL.
 314          */
 315         status = se_file_access_check(parent_sd,
 316                                 get_current_nttok(conn),
 317                                 false,
 318                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 319                                 &access_granted);
 320         if(!NT_STATUS_IS_OK(status)) {
 321                 DEBUG(5,("check_parent_access: access check "
 322                         "on directory %s for "
 323                         "path %s for mask 0x%x returned (0x%x) %s\n",
 324                         parent_dir,
 325                         smb_fname->base_name,
 326                         access_mask,
 327                         access_granted,
 328                         nt_errstr(status) ));
 329                 goto out;
 330         }
 331
 332         if (!(access_mask & (SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR))) {
 333                 status = NT_STATUS_OK;
 334                 goto out;
 335         }
 336         if (!lp_check_parent_directory_delete_on_close(SNUM(conn))) {
 337                 status = NT_STATUS_OK;
 338                 goto out;
 339         }
 340
 341         /* Check if the directory has delete-on-close set */
 342         ret = SMB_VFS_STAT(conn, parent_smb_fname);
 343         if (ret != 0) {
 344                 status = map_nt_error_from_unix(errno);
 345                 goto out;
 346         }
 347
 348         id = SMB_VFS_FILE_ID_CREATE(conn, &parent_smb_fname->st);
 349
 350         status = file_name_hash(conn, parent_smb_fname->base_name, &name_hash);
 351         if (!NT_STATUS_IS_OK(status)) {
 352                 goto out;
 353         }
 354
 355         lck = get_existing_share_mode_lock(frame, id);
 356         if (lck == NULL) {
 357                 status = NT_STATUS_OK;
 358                 goto out;
 359         }
 360
 361         delete_on_close_set = is_delete_on_close_set(lck, name_hash);
 362         if (delete_on_close_set) {
 363                 status = NT_STATUS_DELETE_PENDING;
 364                 goto out;
 365         }
 366
 367         status = NT_STATUS_OK;
 368
 369 out:
 370         TALLOC_FREE(frame);
 371         return status;
 372 }
 373
 374 /****************************************************************************
 375  Ensure when opening a base file for a stream open that we have permissions
 376  to do so given the access mask on the base file.
 377 ****************************************************************************/
 378
 379 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 380                                 struct smb_filename *smb_fname,
 381                                 uint32_t access_mask)
 382 {
 383         NTSTATUS status;
 384
 385         status = smbd_calculate_access_mask(conn, smb_fname,
 386                                         false,
 387                                         access_mask,
 388                                         &access_mask);
 389         if (!NT_STATUS_IS_OK(status)) {
 390                 DEBUG(10, ("smbd_calculate_access_mask "
 391                         "on file %s returned %s\n",
 392                         smb_fname_str_dbg(smb_fname),
 393                         nt_errstr(status)));
 394                 return status;
 395         }
 396
 397         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 398                 uint32_t dosattrs;
 399                 if (!CAN_WRITE(conn)) {
 400                         return NT_STATUS_ACCESS_DENIED;
 401                 }
 402                 dosattrs = dos_mode(conn, smb_fname);
 403                 if (IS_DOS_READONLY(dosattrs)) {
 404                         return NT_STATUS_ACCESS_DENIED;
 405                 }
 406         }
 407
 408         return smbd_check_access_rights(conn,
 409                                         smb_fname,
 410                                         false,
 411                                         access_mask);
 412 }
 413
 414 /****************************************************************************
 415  Handle differing symlink errno's
 416 ****************************************************************************/
 417
 418 static int link_errno_convert(int err)
 419 {
 420 #if defined(ENOTSUP) && defined(OSF1)
 421         /* handle special Tru64 errno */
 422         if (err == ENOTSUP) {
 423                 err = ELOOP;
 424         }
 425 #endif /* ENOTSUP */
 426 #ifdef EFTYPE
 427         /* fix broken NetBSD errno */
 428         if (err == EFTYPE) {
 429                 err = ELOOP;
 430         }
 431 #endif /* EFTYPE */
 432         /* fix broken FreeBSD errno */
 433         if (err == EMLINK) {
 434                 err = ELOOP;
 435         }
 436         return err;
 437 }
 438
 439 static int non_widelink_open(struct connection_struct *conn,
 440                         const struct smb_filename *conn_rootdir_fname,
 441                         files_struct *fsp,
 442                         struct smb_filename *smb_fname,
 443                         int flags,
 444                         mode_t mode,
 445                         unsigned int link_depth);
 446
 447 /****************************************************************************
 448  Follow a symlink in userspace.
 449 ****************************************************************************/
 450
 451 static int process_symlink_open(struct connection_struct *conn,
 452                         const struct smb_filename *conn_rootdir_fname,
 453                         files_struct *fsp,
 454                         struct smb_filename *smb_fname,
 455                         int flags,
 456                         mode_t mode,
 457                         unsigned int link_depth)
 458 {
 459         int fd = -1;
 460         char *link_target = NULL;
 461         struct smb_filename target_fname = {0};
 462         int link_len = -1;
 463         struct smb_filename *oldwd_fname = NULL;
 464         size_t rootdir_len = 0;
 465         struct smb_filename *resolved_fname = NULL;
 466         char *resolved_name = NULL;
 467         bool matched = false;
 468         int saved_errno = 0;
 469
 470         /*
 471          * Ensure we don't get stuck in a symlink loop.
 472          */
 473         link_depth++;
 474         if (link_depth >= 20) {
 475                 errno = ELOOP;
 476                 goto out;
 477         }
 478
 479         /* Allocate space for the link target. */
 480         link_target = talloc_array(talloc_tos(), char, PATH_MAX);
 481         if (link_target == NULL) {
 482                 errno = ENOMEM;
 483                 goto out;
 484         }
 485
 486         /* Read the link target. */
 487         link_len = SMB_VFS_READLINK(conn,
 488                                 smb_fname,
 489                                 link_target,
 490                                 PATH_MAX - 1);
 491         if (link_len == -1) {
 492                 goto out;
 493         }
 494
 495         /* Ensure it's at least null terminated. */
 496         link_target[link_len] = '\0';
 497         target_fname = (struct smb_filename){ .base_name = link_target };
 498
 499         /* Convert to an absolute path. */
 500         resolved_fname = SMB_VFS_REALPATH(conn, talloc_tos(), &target_fname);
 501         if (resolved_fname == NULL) {
 502                 goto out;
 503         }
 504         resolved_name = resolved_fname->base_name;
 505
 506         /*
 507          * We know conn_rootdir starts with '/' and
 508          * does not end in '/'. FIXME ! Should we
 509          * smb_assert this ?
 510          */
 511         rootdir_len = strlen(conn_rootdir_fname->base_name);
 512
 513         matched = (strncmp(conn_rootdir_fname->base_name,
 514                                 resolved_name,
 515                                 rootdir_len) == 0);
 516         if (!matched) {
 517                 errno = EACCES;
 518                 goto out;
 519         }
 520
 521         /*
 522          * Turn into a path relative to the share root.
 523          */
 524         if (resolved_name[rootdir_len] == '\0') {
 525                 /* Link to the root of the share. */
 526                 TALLOC_FREE(smb_fname->base_name);
 527                 smb_fname->base_name = talloc_strdup(smb_fname, ".");
 528         } else if (resolved_name[rootdir_len] == '/') {
 529                 TALLOC_FREE(smb_fname->base_name);
 530                 smb_fname->base_name = talloc_strdup(smb_fname,
 531                                         &resolved_name[rootdir_len+1]);
 532         } else {
 533                 errno = EACCES;
 534                 goto out;
 535         }
 536
 537         if (smb_fname->base_name == NULL) {
 538                 errno = ENOMEM;
 539                 goto out;
 540         }
 541
 542         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 543         if (oldwd_fname == NULL) {
 544                 goto out;
 545         }
 546
 547         /* Ensure we operate from the root of the share. */
 548         if (vfs_ChDir(conn, conn_rootdir_fname) == -1) {
 549                 goto out;
 550         }
 551
 552         /* And do it all again.. */
 553         fd = non_widelink_open(conn,
 554                                 conn_rootdir_fname,
 555                                 fsp,
 556                                 smb_fname,
 557                                 flags,
 558                                 mode,
 559                                 link_depth);
 560         if (fd == -1) {
 561                 saved_errno = errno;
 562         }
 563
 564   out:
 565
 566         TALLOC_FREE(resolved_fname);
 567         TALLOC_FREE(link_target);
 568         if (oldwd_fname != NULL) {
 569                 int ret = vfs_ChDir(conn, oldwd_fname);
 570                 if (ret == -1) {
 571                         smb_panic("unable to get back to old directory\n");
 572                 }
 573                 TALLOC_FREE(oldwd_fname);
 574         }
 575         if (saved_errno != 0) {
 576                 errno = saved_errno;
 577         }
 578         return fd;
 579 }
 580
 581 /****************************************************************************
 582  Non-widelink open.
 583 ****************************************************************************/
 584
 585 static int non_widelink_open(struct connection_struct *conn,
 586                         const struct smb_filename *conn_rootdir_fname,
 587                         files_struct *fsp,
 588                         struct smb_filename *smb_fname,
 589                         int flags,
 590                         mode_t mode,
 591                         unsigned int link_depth)
 592 {
 593         NTSTATUS status;
 594         int fd = -1;
 595         struct smb_filename *smb_fname_rel = NULL;
 596         int saved_errno = 0;
 597         struct smb_filename *oldwd_fname = NULL;
 598         char *parent_dir = NULL;
 599         struct smb_filename parent_dir_fname = {0};
 600         const char *final_component = NULL;
 601         bool is_directory = false;
 602         bool ok;
 603
 604 #ifdef O_DIRECTORY
 605         if (flags & O_DIRECTORY) {
 606                 is_directory = true;
 607         }
 608 #endif
 609
 610         if (is_directory) {
 611                 parent_dir = talloc_strdup(talloc_tos(), smb_fname->base_name);
 612                 if (parent_dir == NULL) {
 613                         saved_errno = errno;
 614                         goto out;
 615                 }
 616
 617                 final_component = ".";
 618         } else {
 619                 ok = parent_dirname(talloc_tos(),
 620                                     smb_fname->base_name,
 621                                     &parent_dir,
 622                                     &final_component);
 623                 if (!ok) {
 624                         saved_errno = errno;
 625                         goto out;
 626                 }
 627         }
 628
 629         parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
 630
 631         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 632         if (oldwd_fname == NULL) {
 633                 goto out;
 634         }
 635
 636         /* Pin parent directory in place. */
 637         if (vfs_ChDir(conn, &parent_dir_fname) == -1) {
 638                 goto out;
 639         }
 640
 641         smb_fname_rel = synthetic_smb_fname(talloc_tos(),
 642                                 final_component,
 643                                 smb_fname->stream_name,
 644                                 &smb_fname->st,
 645                                 smb_fname->flags);
 646         if (smb_fname_rel == NULL) {
 647                 saved_errno = ENOMEM;
 648                 goto out;
 649         }
 650
 651         /* Ensure the relative path is below the share. */
 652         status = check_reduced_name(conn, &parent_dir_fname, smb_fname_rel);
 653         if (!NT_STATUS_IS_OK(status)) {
 654                 saved_errno = map_errno_from_nt_status(status);
 655                 goto out;
 656         }
 657
 658         flags |= O_NOFOLLOW;
 659
 660         {
 661                 struct smb_filename *tmp_name = fsp->fsp_name;
 662                 fsp->fsp_name = smb_fname_rel;
 663                 fd = SMB_VFS_OPEN(conn, smb_fname_rel, fsp, flags, mode);
 664                 fsp->fsp_name = tmp_name;
 665         }
 666
 667         if (fd == -1) {
 668                 saved_errno = link_errno_convert(errno);
 669                 /*
 670                  * Trying to open a symlink to a directory with O_NOFOLLOW and
 671                  * O_DIRECTORY can return either of ELOOP and ENOTDIR. So
 672                  * ENOTDIR really means: might be a symlink, but we're not sure.
 673                  * In this case, we just assume there's a symlink. If we were
 674                  * wrong, process_symlink_open() will return EINVAL. We check
 675                  * this below, and fall back to returning the initial
 676                  * saved_errno.
 677                  *
 678                  * BUG: https://bugzilla.samba.org/show_bug.cgi?id=12860
 679                  */
 680                 if (saved_errno == ELOOP || saved_errno == ENOTDIR) {
 681                         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
 682                                 /* Never follow symlinks on posix open. */
 683                                 goto out;
 684                         }
 685                         if (!lp_follow_symlinks(SNUM(conn))) {
 686                                 /* Explicitly no symlinks. */
 687                                 goto out;
 688                         }
 689                         /*
 690                          * We may have a symlink. Follow in userspace
 691                          * to ensure it's under the share definition.
 692                          */
 693                         fd = process_symlink_open(conn,
 694                                         conn_rootdir_fname,
 695                                         fsp,
 696                                         smb_fname_rel,
 697                                         flags,
 698                                         mode,
 699                                         link_depth);
 700                         if (fd == -1) {
 701                                 if (saved_errno == ENOTDIR &&
 702                                                 errno == EINVAL) {
 703                                         /*
 704                                          * O_DIRECTORY on neither a directory,
 705                                          * nor a symlink. Just return
 706                                          * saved_errno from initial open()
 707                                          */
 708                                         goto out;
 709                                 }
 710                                 saved_errno =
 711                                         link_errno_convert(errno);
 712                         }
 713                 }
 714         }
 715
 716   out:
 717
 718         TALLOC_FREE(parent_dir);
 719         TALLOC_FREE(smb_fname_rel);
 720
 721         if (oldwd_fname != NULL) {
 722                 int ret = vfs_ChDir(conn, oldwd_fname);
 723                 if (ret == -1) {
 724                         smb_panic("unable to get back to old directory\n");
 725                 }
 726                 TALLOC_FREE(oldwd_fname);
 727         }
 728         if (saved_errno != 0) {
 729                 errno = saved_errno;
 730         }
 731         return fd;
 732 }
 733
 734 /****************************************************************************
 735  fd support routines - attempt to do a dos_open.
 736 ****************************************************************************/
 737
 738 NTSTATUS fd_open(struct connection_struct *conn,
 739                  files_struct *fsp,
 740                  int flags,
 741                  mode_t mode)
 742 {
 743         struct smb_filename *smb_fname = fsp->fsp_name;
 744         NTSTATUS status = NT_STATUS_OK;
 745
 746         /*
 747          * Never follow symlinks on a POSIX client. The
 748          * client should be doing this.
 749          */
 750
 751         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || !lp_follow_symlinks(SNUM(conn))) {
 752                 flags |= O_NOFOLLOW;
 753         }
 754
 755         /* Ensure path is below share definition. */
 756         if (!lp_widelinks(SNUM(conn))) {
 757                 struct smb_filename *conn_rootdir_fname = NULL;
 758                 const char *conn_rootdir = SMB_VFS_CONNECTPATH(conn,
 759                                                 smb_fname);
 760                 int saved_errno = 0;
 761
 762                 if (conn_rootdir == NULL) {
 763                         return NT_STATUS_NO_MEMORY;
 764                 }
 765                 conn_rootdir_fname = synthetic_smb_fname(talloc_tos(),
 766                                                 conn_rootdir,
 767                                                 NULL,
 768                                                 NULL,
 769                                                 0);
 770                 if (conn_rootdir_fname == NULL) {
 771                         return NT_STATUS_NO_MEMORY;
 772                 }
 773
 774                 /*
 775                  * Only follow symlinks within a share
 776                  * definition.
 777                  */
 778                 fsp->fh->fd = non_widelink_open(conn,
 779                                         conn_rootdir_fname,
 780                                         fsp,
 781                                         smb_fname,
 782                                         flags,
 783                                         mode,
 784                                         0);
 785                 if (fsp->fh->fd == -1) {
 786                         saved_errno = errno;
 787                 }
 788                 TALLOC_FREE(conn_rootdir_fname);
 789                 if (saved_errno != 0) {
 790                         errno = saved_errno;
 791                 }
 792         } else {
 793                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 794         }
 795
 796         if (fsp->fh->fd == -1) {
 797                 int posix_errno = link_errno_convert(errno);
 798                 status = map_nt_error_from_unix(posix_errno);
 799                 if (errno == EMFILE) {
 800                         static time_t last_warned = 0L;
 801
 802                         if (time((time_t *) NULL) > last_warned) {
 803                                 DEBUG(0,("Too many open files, unable "
 804                                         "to open more!  smbd's max "
 805                                         "open files = %d\n",
 806                                         lp_max_open_files()));
 807                                 last_warned = time((time_t *) NULL);
 808                         }
 809                 }
 810
 811         }
 812
 813         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 814                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 815                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 816
 817         return status;
 818 }
 819
 820 /****************************************************************************
 821  Close the file associated with a fsp.
 822 ****************************************************************************/
 823
 824 NTSTATUS fd_close(files_struct *fsp)
 825 {
 826         int ret;
 827
 828         if (fsp->dptr) {
 829                 dptr_CloseDir(fsp);
 830         }
 831         if (fsp->fh->fd == -1) {
 832                 return NT_STATUS_OK; /* What we used to call a stat open. */
 833         }
 834         if (fsp->fh->ref_count > 1) {
 835                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 836         }
 837
 838         ret = SMB_VFS_CLOSE(fsp);
 839         fsp->fh->fd = -1;
 840         if (ret == -1) {
 841                 return map_nt_error_from_unix(errno);
 842         }
 843         return NT_STATUS_OK;
 844 }
 845
 846 /****************************************************************************
 847  Change the ownership of a file to that of the parent directory.
 848  Do this by fd if possible.
 849 ****************************************************************************/
 850
 851 void change_file_owner_to_parent(connection_struct *conn,
 852                                         const char *inherit_from_dir,
 853                                         files_struct *fsp)
 854 {
 855         struct smb_filename *smb_fname_parent;
 856         int ret;
 857
 858         smb_fname_parent = synthetic_smb_fname(talloc_tos(),
 859                                         inherit_from_dir,
 860                                         NULL,
 861                                         NULL,
 862                                         0);
 863         if (smb_fname_parent == NULL) {
 864                 return;
 865         }
 866
 867         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 868         if (ret == -1) {
 869                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 870                          "directory %s. Error was %s\n",
 871                          smb_fname_str_dbg(smb_fname_parent),
 872                          strerror(errno)));
 873                 TALLOC_FREE(smb_fname_parent);
 874                 return;
 875         }
 876
 877         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 878                 /* Already this uid - no need to change. */
 879                 DEBUG(10,("change_file_owner_to_parent: file %s "
 880                         "is already owned by uid %d\n",
 881                         fsp_str_dbg(fsp),
 882                         (int)fsp->fsp_name->st.st_ex_uid ));
 883                 TALLOC_FREE(smb_fname_parent);
 884                 return;
 885         }
 886
 887         become_root();
 888         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 889         unbecome_root();
 890         if (ret == -1) {
 891                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 892                          "file %s to parent directory uid %u. Error "
 893                          "was %s\n", fsp_str_dbg(fsp),
 894                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 895                          strerror(errno) ));
 896         } else {
 897                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 898                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 899                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 900                 /* Ensure the uid entry is updated. */
 901                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 902         }
 903
 904         TALLOC_FREE(smb_fname_parent);
 905 }
 906
 907 static NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 908                                         const char *inherit_from_dir,
 909                                         struct smb_filename *smb_dname,
 910                                         SMB_STRUCT_STAT *psbuf)
 911 {
 912         struct smb_filename *smb_fname_parent;
 913         struct smb_filename *smb_fname_cwd = NULL;
 914         struct smb_filename *saved_dir_fname = NULL;
 915         TALLOC_CTX *ctx = talloc_tos();
 916         NTSTATUS status = NT_STATUS_OK;
 917         int ret;
 918
 919         smb_fname_parent = synthetic_smb_fname(ctx,
 920                                         inherit_from_dir,
 921                                         NULL,
 922                                         NULL,
 923                                         0);
 924         if (smb_fname_parent == NULL) {
 925                 return NT_STATUS_NO_MEMORY;
 926         }
 927
 928         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 929         if (ret == -1) {
 930                 status = map_nt_error_from_unix(errno);
 931                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 932                          "directory %s. Error was %s\n",
 933                          smb_fname_str_dbg(smb_fname_parent),
 934                          strerror(errno)));
 935                 goto out;
 936         }
 937
 938         /* We've already done an lstat into psbuf, and we know it's a
 939            directory. If we can cd into the directory and the dev/ino
 940            are the same then we can safely chown without races as
 941            we're locking the directory in place by being in it.  This
 942            should work on any UNIX (thanks tridge :-). JRA.
 943         */
 944
 945         saved_dir_fname = vfs_GetWd(ctx,conn);
 946         if (!saved_dir_fname) {
 947                 status = map_nt_error_from_unix(errno);
 948                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 949                          "current working directory. Error was %s\n",
 950                          strerror(errno)));
 951                 goto out;
 952         }
 953
 954         /* Chdir into the new path. */
 955         if (vfs_ChDir(conn, smb_dname) == -1) {
 956                 status = map_nt_error_from_unix(errno);
 957                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 958                          "current working directory to %s. Error "
 959                          "was %s\n", smb_dname->base_name, strerror(errno) ));
 960                 goto chdir;
 961         }
 962
 963         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL, 0);
 964         if (smb_fname_cwd == NULL) {
 965                 status = NT_STATUS_NO_MEMORY;
 966                 goto chdir;
 967         }
 968
 969         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 970         if (ret == -1) {
 971                 status = map_nt_error_from_unix(errno);
 972                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 973                          "directory '.' (%s) Error was %s\n",
 974                          smb_dname->base_name, strerror(errno)));
 975                 goto chdir;
 976         }
 977
 978         /* Ensure we're pointing at the same place. */
 979         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 980             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 981                 DEBUG(0,("change_dir_owner_to_parent: "
 982                          "device/inode on directory %s changed. "
 983                          "Refusing to chown !\n",
 984                         smb_dname->base_name ));
 985                 status = NT_STATUS_ACCESS_DENIED;
 986                 goto chdir;
 987         }
 988
 989         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 990                 /* Already this uid - no need to change. */
 991                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 992                         "is already owned by uid %d\n",
 993                         smb_dname->base_name,
 994                         (int)smb_fname_cwd->st.st_ex_uid ));
 995                 status = NT_STATUS_OK;
 996                 goto chdir;
 997         }
 998
 999         become_root();
1000         ret = SMB_VFS_LCHOWN(conn,
1001                         smb_fname_cwd,
1002                         smb_fname_parent->st.st_ex_uid,
1003                         (gid_t)-1);
1004         unbecome_root();
1005         if (ret == -1) {
1006                 status = map_nt_error_from_unix(errno);
1007                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
1008                           "directory %s to parent directory uid %u. "
1009                           "Error was %s\n",
1010                           smb_dname->base_name,
1011                           (unsigned int)smb_fname_parent->st.st_ex_uid,
1012                           strerror(errno) ));
1013         } else {
1014                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
1015                         "directory %s to parent directory uid %u.\n",
1016                         smb_dname->base_name,
1017                         (unsigned int)smb_fname_parent->st.st_ex_uid ));
1018                 /* Ensure the uid entry is updated. */
1019                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
1020         }
1021
1022  chdir:
1023         vfs_ChDir(conn, saved_dir_fname);
1024  out:
1025         TALLOC_FREE(saved_dir_fname);
1026         TALLOC_FREE(smb_fname_parent);
1027         TALLOC_FREE(smb_fname_cwd);
1028         return status;
1029 }
1030
1031 /****************************************************************************
1032  Open a file - returning a guaranteed ATOMIC indication of if the
1033  file was created or not.
1034 ****************************************************************************/
1035
1036 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
1037                         files_struct *fsp,
1038                         int flags,
1039                         mode_t mode,
1040                         bool *file_created)
1041 {
1042         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1043         NTSTATUS retry_status;
1044         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1045         int curr_flags;
1046
1047         *file_created = false;
1048
1049         if (!(flags & O_CREAT)) {
1050                 /*
1051                  * We're not creating the file, just pass through.
1052                  */
1053                 return fd_open(conn, fsp, flags, mode);
1054         }
1055
1056         if (flags & O_EXCL) {
1057                 /*
1058                  * Fail if already exists, just pass through.
1059                  */
1060                 status = fd_open(conn, fsp, flags, mode);
1061
1062                 /*
1063                  * Here we've opened with O_CREAT|O_EXCL. If that went
1064                  * NT_STATUS_OK, we *know* we created this file.
1065                  */
1066                 *file_created = NT_STATUS_IS_OK(status);
1067
1068                 return status;
1069         }
1070
1071         /*
1072          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
1073          * To know absolutely if we created the file or not,
1074          * we can never call O_CREAT without O_EXCL. So if
1075          * we think the file existed, try without O_CREAT|O_EXCL.
1076          * If we think the file didn't exist, try with
1077          * O_CREAT|O_EXCL.
1078          *
1079          * The big problem here is dangling symlinks. Opening
1080          * without O_NOFOLLOW means both bad symlink
1081          * and missing path return -1, ENOENT from open(). As POSIX
1082          * is pathname based it's not possible to tell
1083          * the difference between these two cases in a
1084          * non-racy way, so change to try only two attempts before
1085          * giving up.
1086          *
1087          * We don't have this problem for the O_NOFOLLOW
1088          * case as it just returns NT_STATUS_OBJECT_PATH_NOT_FOUND
1089          * mapped from the ELOOP POSIX error.
1090          */
1091
1092         curr_flags = flags;
1093
1094         if (file_existed) {
1095                 curr_flags &= ~(O_CREAT);
1096                 retry_status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1097         } else {
1098                 curr_flags |= O_EXCL;
1099                 retry_status = NT_STATUS_OBJECT_NAME_COLLISION;
1100         }
1101
1102         status = fd_open(conn, fsp, curr_flags, mode);
1103         if (NT_STATUS_IS_OK(status)) {
1104                 if (!file_existed) {
1105                         *file_created = true;
1106                 }
1107                 return NT_STATUS_OK;
1108         }
1109         if (!NT_STATUS_EQUAL(status, retry_status)) {
1110                 return status;
1111         }
1112
1113         curr_flags = flags;
1114
1115         /*
1116          * Keep file_existed up to date for clarity.
1117          */
1118         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1119                 file_existed = false;
1120                 curr_flags |= O_EXCL;
1121                 DBG_DEBUG("file %s did not exist. Retry.\n",
1122                         smb_fname_str_dbg(fsp->fsp_name));
1123         } else {
1124                 file_existed = true;
1125                 curr_flags &= ~(O_CREAT);
1126                 DBG_DEBUG("file %s existed. Retry.\n",
1127                         smb_fname_str_dbg(fsp->fsp_name));
1128         }
1129
1130         status = fd_open(conn, fsp, curr_flags, mode);
1131
1132         if (NT_STATUS_IS_OK(status) && (!file_existed)) {
1133                 *file_created = true;
1134         }
1135
1136         return status;
1137 }
1138
1139 /****************************************************************************
1140  Open a file.
1141 ****************************************************************************/
1142
1143 static NTSTATUS open_file(files_struct *fsp,
1144                           connection_struct *conn,
1145                           struct smb_request *req,
1146                           const char *parent_dir,
1147                           int flags,
1148                           mode_t unx_mode,
1149                           uint32_t access_mask, /* client requested access mask. */
1150                           uint32_t open_access_mask, /* what we're actually using in the open. */
1151                           bool *p_file_created)
1152 {
1153         struct smb_filename *smb_fname = fsp->fsp_name;
1154         NTSTATUS status = NT_STATUS_OK;
1155         int accmode = (flags & O_ACCMODE);
1156         int local_flags = flags;
1157         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1158
1159         fsp->fh->fd = -1;
1160         errno = EPERM;
1161
1162         /* Check permissions */
1163
1164         /*
1165          * This code was changed after seeing a client open request
1166          * containing the open mode of (DENY_WRITE/read-only) with
1167          * the 'create if not exist' bit set. The previous code
1168          * would fail to open the file read only on a read-only share
1169          * as it was checking the flags parameter  directly against O_RDONLY,
1170          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
1171          * JRA.
1172          */
1173
1174         if (!CAN_WRITE(conn)) {
1175                 /* It's a read-only share - fail if we wanted to write. */
1176                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
1177                         DEBUG(3,("Permission denied opening %s\n",
1178                                  smb_fname_str_dbg(smb_fname)));
1179                         return NT_STATUS_ACCESS_DENIED;
1180                 }
1181                 if (flags & O_CREAT) {
1182                         /* We don't want to write - but we must make sure that
1183                            O_CREAT doesn't create the file if we have write
1184                            access into the directory.
1185                         */
1186                         flags &= ~(O_CREAT|O_EXCL);
1187                         local_flags &= ~(O_CREAT|O_EXCL);
1188                 }
1189         }
1190
1191         /*
1192          * This little piece of insanity is inspired by the
1193          * fact that an NT client can open a file for O_RDONLY,
1194          * but set the create disposition to FILE_EXISTS_TRUNCATE.
1195          * If the client *can* write to the file, then it expects to
1196          * truncate the file, even though it is opening for readonly.
1197          * Quicken uses this stupid trick in backup file creation...
1198          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
1199          * for helping track this one down. It didn't bite us in 2.0.x
1200          * as we always opened files read-write in that release. JRA.
1201          */
1202
1203         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
1204                 DEBUG(10,("open_file: truncate requested on read-only open "
1205                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
1206                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
1207         }
1208
1209         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
1210             (!file_existed && (local_flags & O_CREAT)) ||
1211             ((local_flags & O_TRUNC) == O_TRUNC) ) {
1212                 const char *wild;
1213                 int ret;
1214
1215 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
1216                 /*
1217                  * We would block on opening a FIFO with no one else on the
1218                  * other end. Do what we used to do and add O_NONBLOCK to the
1219                  * open flags. JRA.
1220                  */
1221
1222                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
1223                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
1224                         local_flags |= O_NONBLOCK;
1225                 }
1226 #endif
1227
1228                 /* Don't create files with Microsoft wildcard characters. */
1229                 if (fsp->base_fsp) {
1230                         /*
1231                          * wildcard characters are allowed in stream names
1232                          * only test the basefilename
1233                          */
1234                         wild = fsp->base_fsp->fsp_name->base_name;
1235                 } else {
1236                         wild = smb_fname->base_name;
1237                 }
1238                 if ((local_flags & O_CREAT) && !file_existed &&
1239                     !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
1240                     ms_has_wild(wild))  {
1241                         return NT_STATUS_OBJECT_NAME_INVALID;
1242                 }
1243
1244                 /* Can we access this file ? */
1245                 if (!fsp->base_fsp) {
1246                         /* Only do this check on non-stream open. */
1247                         if (file_existed) {
1248                                 status = smbd_check_access_rights(conn,
1249                                                 smb_fname,
1250                                                 false,
1251                                                 access_mask);
1252
1253                                 if (!NT_STATUS_IS_OK(status)) {
1254                                         DEBUG(10, ("open_file: "
1255                                                    "smbd_check_access_rights "
1256                                                    "on file %s returned %s\n",
1257                                                    smb_fname_str_dbg(smb_fname),
1258                                                    nt_errstr(status)));
1259                                 }
1260
1261                                 if (!NT_STATUS_IS_OK(status) &&
1262                                     !NT_STATUS_EQUAL(status,
1263                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1264                                 {
1265                                         return status;
1266                                 }
1267
1268                                 if (NT_STATUS_EQUAL(status,
1269                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1270                                 {
1271                                         DEBUG(10, ("open_file: "
1272                                                 "file %s vanished since we "
1273                                                 "checked for existence.\n",
1274                                                 smb_fname_str_dbg(smb_fname)));
1275                                         file_existed = false;
1276                                         SET_STAT_INVALID(fsp->fsp_name->st);
1277                                 }
1278                         }
1279
1280                         if (!file_existed) {
1281                                 if (!(local_flags & O_CREAT)) {
1282                                         /* File didn't exist and no O_CREAT. */
1283                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1284                                 }
1285
1286                                 status = check_parent_access(conn,
1287                                                              smb_fname,
1288                                                              SEC_DIR_ADD_FILE);
1289                                 if (!NT_STATUS_IS_OK(status)) {
1290                                         DEBUG(10, ("open_file: "
1291                                                    "check_parent_access on "
1292                                                    "file %s returned %s\n",
1293                                                    smb_fname_str_dbg(smb_fname),
1294                                                    nt_errstr(status) ));
1295                                         return status;
1296                                 }
1297                         }
1298                 }
1299
1300                 /*
1301                  * Actually do the open - if O_TRUNC is needed handle it
1302                  * below under the share mode lock.
1303                  */
1304                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
1305                                 unx_mode, p_file_created);
1306                 if (!NT_STATUS_IS_OK(status)) {
1307                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
1308                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
1309                                  nt_errstr(status),local_flags,flags));
1310                         return status;
1311                 }
1312
1313                 if (local_flags & O_NONBLOCK) {
1314                         /*
1315                          * GPFS can return ETIMEDOUT for pread on
1316                          * nonblocking file descriptors when files
1317                          * migrated to tape need to be recalled. I
1318                          * could imagine this happens elsehwere
1319                          * too. With blocking file descriptors this
1320                          * does not happen.
1321                          */
1322                         ret = set_blocking(fsp->fh->fd, true);
1323                         if (ret == -1) {
1324                                 status = map_nt_error_from_unix(errno);
1325                                 DBG_WARNING("Could not set fd to blocking: "
1326                                             "%s\n", strerror(errno));
1327                                 fd_close(fsp);
1328                                 return status;
1329                         }
1330                 }
1331
1332                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1333                 if (ret == -1) {
1334                         /* If we have an fd, this stat should succeed. */
1335                         DEBUG(0,("Error doing fstat on open file %s "
1336                                 "(%s)\n",
1337                                 smb_fname_str_dbg(smb_fname),
1338                                 strerror(errno) ));
1339                         status = map_nt_error_from_unix(errno);
1340                         fd_close(fsp);
1341                         return status;
1342                 }
1343
1344                 if (*p_file_created) {
1345                         /* We created this file. */
1346
1347                         bool need_re_stat = false;
1348                         /* Do all inheritance work after we've
1349                            done a successful fstat call and filled
1350                            in the stat struct in fsp->fsp_name. */
1351
1352                         /* Inherit the ACL if required */
1353                         if (lp_inherit_permissions(SNUM(conn))) {
1354                                 inherit_access_posix_acl(conn, parent_dir,
1355                                                          smb_fname,
1356                                                          unx_mode);
1357                                 need_re_stat = true;
1358                         }
1359
1360                         /* Change the owner if required. */
1361                         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
1362                                 change_file_owner_to_parent(conn, parent_dir,
1363                                                             fsp);
1364                                 need_re_stat = true;
1365                         }
1366
1367                         if (need_re_stat) {
1368                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1369                                 /* If we have an fd, this stat should succeed. */
1370                                 if (ret == -1) {
1371                                         DEBUG(0,("Error doing fstat on open file %s "
1372                                                  "(%s)\n",
1373                                                  smb_fname_str_dbg(smb_fname),
1374                                                  strerror(errno) ));
1375                                 }
1376                         }
1377
1378                         notify_fname(conn, NOTIFY_ACTION_ADDED,
1379                                      FILE_NOTIFY_CHANGE_FILE_NAME,
1380                                      smb_fname->base_name);
1381                 }
1382         } else {
1383                 fsp->fh->fd = -1; /* What we used to call a stat open. */
1384                 if (!file_existed) {
1385                         /* File must exist for a stat open. */
1386                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1387                 }
1388
1389                 status = smbd_check_access_rights(conn,
1390                                 smb_fname,
1391                                 false,
1392                                 access_mask);
1393
1394                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1395                                 (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) &&
1396                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
1397                         /* This is a POSIX stat open for delete
1398                          * or rename on a symlink that points
1399                          * nowhere. Allow. */
1400                         DEBUG(10,("open_file: allowing POSIX "
1401                                   "open on bad symlink %s\n",
1402                                   smb_fname_str_dbg(smb_fname)));
1403                         status = NT_STATUS_OK;
1404                 }
1405
1406                 if (!NT_STATUS_IS_OK(status)) {
1407                         DEBUG(10,("open_file: "
1408                                 "smbd_check_access_rights on file "
1409                                 "%s returned %s\n",
1410                                 smb_fname_str_dbg(smb_fname),
1411                                 nt_errstr(status) ));
1412                         return status;
1413                 }
1414         }
1415
1416         /*
1417          * POSIX allows read-only opens of directories. We don't
1418          * want to do this (we use a different code path for this)
1419          * so catch a directory open and return an EISDIR. JRA.
1420          */
1421
1422         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1423                 fd_close(fsp);
1424                 errno = EISDIR;
1425                 return NT_STATUS_FILE_IS_A_DIRECTORY;
1426         }
1427
1428         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
1429         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
1430         fsp->file_pid = req ? req->smbpid : 0;
1431         fsp->can_lock = True;
1432         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
1433         fsp->can_write =
1434                 CAN_WRITE(conn) &&
1435                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
1436         fsp->print_file = NULL;
1437         fsp->modified = False;
1438         fsp->sent_oplock_break = NO_BREAK_SENT;
1439         fsp->is_directory = False;
1440         if (conn->aio_write_behind_list &&
1441             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
1442                        conn->case_sensitive)) {
1443                 fsp->aio_write_behind = True;
1444         }
1445
1446         fsp->wcp = NULL; /* Write cache pointer. */
1447
1448         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1449                  conn->session_info->unix_info->unix_name,
1450                  smb_fname_str_dbg(smb_fname),
1451                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1452                  conn->num_files_open));
1453
1454         errno = 0;
1455         return NT_STATUS_OK;
1456 }
1457
1458 /****************************************************************************
1459  Check if we can open a file with a share mode.
1460  Returns True if conflict, False if not.
1461 ****************************************************************************/
1462
1463 static bool share_conflict(struct share_mode_entry *entry,
1464                            uint32_t access_mask,
1465                            uint32_t share_access)
1466 {
1467         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1468                   "entry->share_access = 0x%x, "
1469                   "entry->private_options = 0x%x\n",
1470                   (unsigned int)entry->access_mask,
1471                   (unsigned int)entry->share_access,
1472                   (unsigned int)entry->private_options));
1473
1474         if (server_id_is_disconnected(&entry->pid)) {
1475                 return false;
1476         }
1477
1478         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1479                   (unsigned int)access_mask, (unsigned int)share_access));
1480
1481         if ((entry->access_mask & (FILE_WRITE_DATA|
1482                                    FILE_APPEND_DATA|
1483                                    FILE_READ_DATA|
1484                                    FILE_EXECUTE|
1485                                    DELETE_ACCESS)) == 0) {
1486                 DEBUG(10,("share_conflict: No conflict due to "
1487                           "entry->access_mask = 0x%x\n",
1488                           (unsigned int)entry->access_mask ));
1489                 return False;
1490         }
1491
1492         if ((access_mask & (FILE_WRITE_DATA|
1493                             FILE_APPEND_DATA|
1494                             FILE_READ_DATA|
1495                             FILE_EXECUTE|
1496                             DELETE_ACCESS)) == 0) {
1497                 DEBUG(10,("share_conflict: No conflict due to "
1498                           "access_mask = 0x%x\n",
1499                           (unsigned int)access_mask ));
1500                 return False;
1501         }
1502
1503 #if 1 /* JRA TEST - Superdebug. */
1504 #define CHECK_MASK(num, am, right, sa, share) \
1505         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1506                 (unsigned int)(num), (unsigned int)(am), \
1507                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1508         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1509                 (unsigned int)(num), (unsigned int)(sa), \
1510                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1511         if (((am) & (right)) && !((sa) & (share))) { \
1512                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1513 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1514                         (unsigned int)(share) )); \
1515                 return True; \
1516         }
1517 #else
1518 #define CHECK_MASK(num, am, right, sa, share) \
1519         if (((am) & (right)) && !((sa) & (share))) { \
1520                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1521 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1522                         (unsigned int)(share) )); \
1523                 return True; \
1524         }
1525 #endif
1526
1527         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1528                    share_access, FILE_SHARE_WRITE);
1529         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1530                    entry->share_access, FILE_SHARE_WRITE);
1531
1532         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1533                    share_access, FILE_SHARE_READ);
1534         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1535                    entry->share_access, FILE_SHARE_READ);
1536
1537         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1538                    share_access, FILE_SHARE_DELETE);
1539         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1540                    entry->share_access, FILE_SHARE_DELETE);
1541
1542         DEBUG(10,("share_conflict: No conflict.\n"));
1543         return False;
1544 }
1545
1546 #if defined(DEVELOPER)
1547 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1548                                       const struct file_id id,
1549                                       int num,
1550                                       struct share_mode_entry *share_entry)
1551 {
1552         struct server_id self = messaging_server_id(sconn->msg_ctx);
1553         files_struct *fsp;
1554
1555         if (!serverid_equal(&self, &share_entry->pid)) {
1556                 return;
1557         }
1558
1559         if (share_entry->op_mid == 0) {
1560                 /* INTERNAL_OPEN_ONLY */
1561                 return;
1562         }
1563
1564         if (!is_valid_share_mode_entry(share_entry)) {
1565                 return;
1566         }
1567
1568         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1569         if (!fsp) {
1570                 DBG_ERR("PANIC : %s\n",
1571                         share_mode_str(talloc_tos(), num, &id,
1572                                        share_entry));
1573                 smb_panic("validate_my_share_entries: Cannot match a "
1574                           "share entry with an open file\n");
1575         }
1576
1577         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1578                 goto panic;
1579         }
1580
1581         return;
1582
1583  panic:
1584         {
1585                 char *str;
1586                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1587                         share_mode_str(talloc_tos(), num, &id,
1588                                        share_entry));
1589                 str = talloc_asprintf(talloc_tos(),
1590                         "validate_my_share_entries: "
1591                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1592                          fsp->fsp_name->base_name,
1593                          (unsigned int)fsp->oplock_type,
1594                          (unsigned int)share_entry->op_type );
1595                 smb_panic(str);
1596         }
1597 }
1598 #endif
1599
1600 bool is_stat_open(uint32_t access_mask)
1601 {
1602         const uint32_t stat_open_bits =
1603                 (SYNCHRONIZE_ACCESS|
1604                  FILE_READ_ATTRIBUTES|
1605                  FILE_WRITE_ATTRIBUTES);
1606
1607         return (((access_mask &  stat_open_bits) != 0) &&
1608                 ((access_mask & ~stat_open_bits) == 0));
1609 }
1610
1611 static bool has_delete_on_close(struct share_mode_lock *lck,
1612                                 uint32_t name_hash)
1613 {
1614         struct share_mode_data *d = lck->data;
1615         uint32_t i;
1616
1617         if (d->num_share_modes == 0) {
1618                 return false;
1619         }
1620         if (!is_delete_on_close_set(lck, name_hash)) {
1621                 return false;
1622         }
1623         for (i=0; i<d->num_share_modes; i++) {
1624                 if (!share_mode_stale_pid(d, i)) {
1625                         return true;
1626                 }
1627         }
1628         return false;
1629 }
1630
1631 /****************************************************************************
1632  Deal with share modes
1633  Invariant: Share mode must be locked on entry and exit.
1634  Returns -1 on error, or number of share modes on success (may be zero).
1635 ****************************************************************************/
1636
1637 static NTSTATUS open_mode_check(connection_struct *conn,
1638                                 struct share_mode_lock *lck,
1639                                 uint32_t access_mask,
1640                                 uint32_t share_access)
1641 {
1642         uint32_t i;
1643
1644         if(lck->data->num_share_modes == 0) {
1645                 return NT_STATUS_OK;
1646         }
1647
1648         if (is_stat_open(access_mask)) {
1649                 /* Stat open that doesn't trigger oplock breaks or share mode
1650                  * checks... ! JRA. */
1651                 return NT_STATUS_OK;
1652         }
1653
1654         /*
1655          * Check if the share modes will give us access.
1656          */
1657
1658 #if defined(DEVELOPER)
1659         for(i = 0; i < lck->data->num_share_modes; i++) {
1660                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1661                                           &lck->data->share_modes[i]);
1662         }
1663 #endif
1664
1665         /* Now we check the share modes, after any oplock breaks. */
1666         for(i = 0; i < lck->data->num_share_modes; i++) {
1667
1668                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1669                         continue;
1670                 }
1671
1672                 /* someone else has a share lock on it, check to see if we can
1673                  * too */
1674                 if (share_conflict(&lck->data->share_modes[i],
1675                                    access_mask, share_access)) {
1676
1677                         if (share_mode_stale_pid(lck->data, i)) {
1678                                 continue;
1679                         }
1680
1681                         return NT_STATUS_SHARING_VIOLATION;
1682                 }
1683         }
1684
1685         return NT_STATUS_OK;
1686 }
1687
1688 /*
1689  * Send a break message to the oplock holder and delay the open for
1690  * our client.
1691  */
1692
1693 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1694                             const struct file_id *id,
1695                             const struct share_mode_entry *exclusive,
1696                             uint16_t break_to)
1697 {
1698         struct oplock_break_message msg = {
1699                 .id = *id,
1700                 .share_file_id = exclusive->share_file_id,
1701                 .break_to = break_to,
1702         };
1703         enum ndr_err_code ndr_err;
1704         DATA_BLOB blob;
1705         NTSTATUS status;
1706
1707         if (DEBUGLVL(10)) {
1708                 struct server_id_buf buf;
1709                 DBG_DEBUG("Sending break message to %s\n",
1710                           server_id_str_buf(exclusive->pid, &buf));
1711                 NDR_PRINT_DEBUG(oplock_break_message, &msg);
1712         }
1713
1714         ndr_err = ndr_push_struct_blob(
1715                 &blob,
1716                 talloc_tos(),
1717                 &msg,
1718                 (ndr_push_flags_fn_t)ndr_push_oplock_break_message);
1719         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1720                 DBG_WARNING("ndr_push_oplock_break_message failed: %s\n",
1721                             ndr_errstr(ndr_err));
1722                 return ndr_map_error2ntstatus(ndr_err);
1723         }
1724
1725         status = messaging_send(
1726                 msg_ctx, exclusive->pid, MSG_SMB_BREAK_REQUEST, &blob);
1727         TALLOC_FREE(blob.data);
1728         if (!NT_STATUS_IS_OK(status)) {
1729                 DEBUG(3, ("Could not send oplock break message: %s\n",
1730                           nt_errstr(status)));
1731         }
1732
1733         return status;
1734 }
1735
1736 /*
1737  * Do internal consistency checks on the share mode for a file.
1738  */
1739
1740 static bool validate_oplock_types(struct share_mode_lock *lck)
1741 {
1742         struct share_mode_data *d = lck->data;
1743         bool batch = false;
1744         bool ex_or_batch = false;
1745         bool level2 = false;
1746         bool no_oplock = false;
1747         uint32_t num_non_stat_opens = 0;
1748         uint32_t i;
1749
1750         for (i=0; i<d->num_share_modes; i++) {
1751                 struct share_mode_entry *e = &d->share_modes[i];
1752
1753                 if (!is_valid_share_mode_entry(e)) {
1754                         continue;
1755                 }
1756
1757                 if (e->op_mid == 0) {
1758                         /* INTERNAL_OPEN_ONLY */
1759                         continue;
1760                 }
1761
1762                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1763                         /* We ignore stat opens in the table - they
1764                            always have NO_OPLOCK and never get or
1765                            cause breaks. JRA. */
1766                         continue;
1767                 }
1768
1769                 num_non_stat_opens += 1;
1770
1771                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1772                         /* batch - can only be one. */
1773                         if (share_mode_stale_pid(d, i)) {
1774                                 DEBUG(10, ("Found stale batch oplock\n"));
1775                                 continue;
1776                         }
1777                         if (ex_or_batch || batch || level2 || no_oplock) {
1778                                 DEBUG(0, ("Bad batch oplock entry %u.",
1779                                           (unsigned)i));
1780                                 return false;
1781                         }
1782                         batch = true;
1783                 }
1784
1785                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1786                         if (share_mode_stale_pid(d, i)) {
1787                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1788                                 continue;
1789                         }
1790                         /* Exclusive or batch - can only be one. */
1791                         if (ex_or_batch || level2 || no_oplock) {
1792                                 DEBUG(0, ("Bad exclusive or batch oplock "
1793                                           "entry %u.", (unsigned)i));
1794                                 return false;
1795                         }
1796                         ex_or_batch = true;
1797                 }
1798
1799                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1800                         if (batch || ex_or_batch) {
1801                                 if (share_mode_stale_pid(d, i)) {
1802                                         DEBUG(10, ("Found stale LevelII "
1803                                                    "oplock\n"));
1804                                         continue;
1805                                 }
1806                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1807                                           (unsigned)i));
1808                                 return false;
1809                         }
1810                         level2 = true;
1811                 }
1812
1813                 if (e->op_type == NO_OPLOCK) {
1814                         if (batch || ex_or_batch) {
1815                                 if (share_mode_stale_pid(d, i)) {
1816                                         DEBUG(10, ("Found stale NO_OPLOCK "
1817                                                    "entry\n"));
1818                                         continue;
1819                                 }
1820                                 DEBUG(0, ("Bad no oplock entry %u.",
1821                                           (unsigned)i));
1822                                 return false;
1823                         }
1824                         no_oplock = true;
1825                 }
1826         }
1827
1828         remove_stale_share_mode_entries(d);
1829
1830         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1831                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1832                           (int)batch, (int)ex_or_batch,
1833                           (int)d->num_share_modes));
1834                 return false;
1835         }
1836
1837         return true;
1838 }
1839
1840 static bool delay_for_oplock(files_struct *fsp,
1841                              int oplock_request,
1842                              const struct smb2_lease *lease,
1843                              struct share_mode_lock *lck,
1844                              bool have_sharing_violation,
1845                              uint32_t create_disposition,
1846                              bool first_open_attempt)
1847 {
1848         struct share_mode_data *d = lck->data;
1849         uint32_t i;
1850         bool delay = false;
1851         bool will_overwrite;
1852
1853         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1854             is_stat_open(fsp->access_mask)) {
1855                 return false;
1856         }
1857
1858         switch (create_disposition) {
1859         case FILE_SUPERSEDE:
1860         case FILE_OVERWRITE:
1861         case FILE_OVERWRITE_IF:
1862                 will_overwrite = true;
1863                 break;
1864         default:
1865                 will_overwrite = false;
1866                 break;
1867         }
1868
1869         for (i=0; i<d->num_share_modes; i++) {
1870                 struct share_mode_entry *e = &d->share_modes[i];
1871                 bool e_is_lease = (e->op_type == LEASE_OPLOCK);
1872                 uint32_t e_lease_type = get_lease_type(d, e);
1873                 uint32_t break_to;
1874                 uint32_t delay_mask = 0;
1875                 bool lease_is_breaking = false;
1876
1877                 if (e_is_lease) {
1878                         NTSTATUS status;
1879
1880                         if (lease != NULL) {
1881                                 bool our_lease = smb2_lease_equal(
1882                                         fsp_client_guid(fsp),
1883                                         &lease->lease_key,
1884                                         &e->client_guid,
1885                                         &e->lease_key);
1886                                 if (our_lease) {
1887                                         DBG_DEBUG("Ignoring our own lease\n");
1888                                         continue;
1889                                 }
1890                         }
1891
1892                         status = leases_db_get(
1893                                 &e->client_guid,
1894                                 &e->lease_key,
1895                                 &fsp->file_id,
1896                                 NULL, /* current_state */
1897                                 &lease_is_breaking,
1898                                 NULL, /* breaking_to_requested */
1899                                 NULL, /* breaking_to_required */
1900                                 NULL, /* lease_version */
1901                                 NULL); /* epoch */
1902                         SMB_ASSERT(NT_STATUS_IS_OK(status));
1903                 }
1904
1905                 if (have_sharing_violation) {
1906                         delay_mask = SMB2_LEASE_HANDLE;
1907                 } else {
1908                         delay_mask = SMB2_LEASE_WRITE;
1909                 }
1910
1911                 break_to = e_lease_type & ~delay_mask;
1912
1913                 if (will_overwrite) {
1914                         /*
1915                          * we'll decide about SMB2_LEASE_READ later.
1916                          *
1917                          * Maybe the break will be deferred
1918                          */
1919                         break_to &= ~SMB2_LEASE_HANDLE;
1920                 }
1921
1922                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1923                            (unsigned)i, (unsigned)e_lease_type,
1924                            (unsigned)will_overwrite));
1925
1926                 if ((e_lease_type & ~break_to) == 0) {
1927                         if (lease_is_breaking) {
1928                                 delay = true;
1929                         }
1930                         continue;
1931                 }
1932
1933                 if (share_mode_stale_pid(d, i)) {
1934                         continue;
1935                 }
1936
1937                 if (will_overwrite) {
1938                         /*
1939                          * If we break anyway break to NONE directly.
1940                          * Otherwise vfs_set_filelen() will trigger the
1941                          * break.
1942                          */
1943                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1944                 }
1945
1946                 if (!e_is_lease) {
1947                         /*
1948                          * Oplocks only support breaking to R or NONE.
1949                          */
1950                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1951                 }
1952
1953                 DEBUG(10, ("breaking from %d to %d\n",
1954                            (int)e_lease_type, (int)break_to));
1955                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1956                                    e, break_to);
1957                 if (e_lease_type & delay_mask) {
1958                         delay = true;
1959                 }
1960                 if (lease_is_breaking && !first_open_attempt) {
1961                         delay = true;
1962                 }
1963         }
1964
1965         return delay;
1966 }
1967
1968 static bool file_has_brlocks(files_struct *fsp)
1969 {
1970         struct byte_range_lock *br_lck;
1971
1972         br_lck = brl_get_locks_readonly(fsp);
1973         if (!br_lck)
1974                 return false;
1975
1976         return (brl_num_locks(br_lck) > 0);
1977 }
1978
1979 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1980                                  const struct smb2_lease_key *key,
1981                                  uint32_t current_state,
1982                                  uint16_t lease_version,
1983                                  uint16_t lease_epoch)
1984 {
1985         struct files_struct *fsp;
1986
1987         /*
1988          * TODO: Measure how expensive this loop is with thousands of open
1989          * handles...
1990          */
1991
1992         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1993              fsp != NULL;
1994              fsp = file_find_di_next(fsp)) {
1995
1996                 if (fsp == new_fsp) {
1997                         continue;
1998                 }
1999                 if (fsp->oplock_type != LEASE_OPLOCK) {
2000                         continue;
2001                 }
2002                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
2003                         fsp->lease->ref_count += 1;
2004                         return fsp->lease;
2005                 }
2006         }
2007
2008         /* Not found - must be leased in another smbd. */
2009         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2010         if (new_fsp->lease == NULL) {
2011                 return NULL;
2012         }
2013         new_fsp->lease->ref_count = 1;
2014         new_fsp->lease->sconn = new_fsp->conn->sconn;
2015         new_fsp->lease->lease.lease_key = *key;
2016         new_fsp->lease->lease.lease_state = current_state;
2017         /*
2018          * We internally treat all leases as V2 and update
2019          * the epoch, but when sending breaks it matters if
2020          * the requesting lease was v1 or v2.
2021          */
2022         new_fsp->lease->lease.lease_version = lease_version;
2023         new_fsp->lease->lease.lease_epoch = lease_epoch;
2024         return new_fsp->lease;
2025 }
2026
2027 static NTSTATUS try_lease_upgrade(struct files_struct *fsp,
2028                                   struct share_mode_lock *lck,
2029                                   const struct GUID *client_guid,
2030                                   const struct smb2_lease *lease,
2031                                   uint32_t granted)
2032 {
2033         bool do_upgrade;
2034         uint32_t current_state, breaking_to_requested, breaking_to_required;
2035         bool breaking;
2036         uint16_t lease_version, epoch;
2037         uint32_t existing, requested;
2038         NTSTATUS status;
2039
2040         status = leases_db_get(
2041                 client_guid,
2042                 &lease->lease_key,
2043                 &fsp->file_id,
2044                 &current_state,
2045                 &breaking,
2046                 &breaking_to_requested,
2047                 &breaking_to_required,
2048                 &lease_version,
2049                 &epoch);
2050         if (!NT_STATUS_IS_OK(status)) {
2051                 return status;
2052         }
2053
2054         fsp->lease = find_fsp_lease(
2055                 fsp,
2056                 &lease->lease_key,
2057                 current_state,
2058                 lease_version,
2059                 epoch);
2060         if (fsp->lease == NULL) {
2061                 DEBUG(1, ("Did not find existing lease for file %s\n",
2062                           fsp_str_dbg(fsp)));
2063                 return NT_STATUS_NO_MEMORY;
2064         }
2065
2066         /*
2067          * Upgrade only if the requested lease is a strict upgrade.
2068          */
2069         existing = current_state;
2070         requested = lease->lease_state;
2071
2072         /*
2073          * Tricky: This test makes sure that "requested" is a
2074          * strict bitwise superset of "existing".
2075          */
2076         do_upgrade = ((existing & requested) == existing);
2077
2078         /*
2079          * Upgrade only if there's a change.
2080          */
2081         do_upgrade &= (granted != existing);
2082
2083         /*
2084          * Upgrade only if other leases don't prevent what was asked
2085          * for.
2086          */
2087         do_upgrade &= (granted == requested);
2088
2089         /*
2090          * only upgrade if we are not in breaking state
2091          */
2092         do_upgrade &= !breaking;
2093
2094         DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2095                    "granted=%"PRIu32", do_upgrade=%d\n",
2096                    existing, requested, granted, (int)do_upgrade));
2097
2098         if (do_upgrade) {
2099                 NTSTATUS set_status;
2100
2101                 current_state = granted;
2102                 epoch += 1;
2103
2104                 set_status = leases_db_set(
2105                         client_guid,
2106                         &lease->lease_key,
2107                         current_state,
2108                         breaking,
2109                         breaking_to_requested,
2110                         breaking_to_required,
2111                         lease_version,
2112                         epoch);
2113
2114                 if (!NT_STATUS_IS_OK(set_status)) {
2115                         DBG_DEBUG("leases_db_set failed: %s\n",
2116                                   nt_errstr(set_status));
2117                         return set_status;
2118                 }
2119         }
2120
2121         fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2122
2123         return NT_STATUS_OK;
2124 }
2125
2126 static NTSTATUS grant_new_fsp_lease(struct files_struct *fsp,
2127                                     struct share_mode_lock *lck,
2128                                     const struct GUID *client_guid,
2129                                     const struct smb2_lease *lease,
2130                                     uint32_t granted)
2131 {
2132         struct share_mode_data *d = lck->data;
2133         NTSTATUS status;
2134
2135         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2136         if (fsp->lease == NULL) {
2137                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2138         }
2139         fsp->lease->ref_count = 1;
2140         fsp->lease->sconn = fsp->conn->sconn;
2141         fsp->lease->lease.lease_version = lease->lease_version;
2142         fsp->lease->lease.lease_key = lease->lease_key;
2143         fsp->lease->lease.lease_state = granted;
2144         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2145
2146         status = leases_db_add(client_guid,
2147                                &lease->lease_key,
2148                                &fsp->file_id,
2149                                fsp->lease->lease.lease_state,
2150                                fsp->lease->lease.lease_version,
2151                                fsp->lease->lease.lease_epoch,
2152                                fsp->conn->connectpath,
2153                                fsp->fsp_name->base_name,
2154                                fsp->fsp_name->stream_name);
2155         if (!NT_STATUS_IS_OK(status)) {
2156                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2157                            nt_errstr(status)));
2158                 TALLOC_FREE(fsp->lease);
2159                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2160         }
2161
2162         d->modified = true;
2163
2164         return NT_STATUS_OK;
2165 }
2166
2167 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2168                                 struct share_mode_lock *lck,
2169                                 const struct smb2_lease *lease,
2170                                 uint32_t granted)
2171 {
2172         const struct GUID *client_guid = fsp_client_guid(fsp);
2173         NTSTATUS status;
2174
2175         status = try_lease_upgrade(fsp, lck, client_guid, lease, granted);
2176
2177         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
2178                 status = grant_new_fsp_lease(
2179                         fsp, lck, client_guid, lease, granted);
2180         }
2181
2182         return status;
2183 }
2184
2185 static bool is_same_lease(const files_struct *fsp,
2186                           const struct share_mode_data *d,
2187                           const struct share_mode_entry *e,
2188                           const struct smb2_lease *lease)
2189 {
2190         if (e->op_type != LEASE_OPLOCK) {
2191                 return false;
2192         }
2193         if (lease == NULL) {
2194                 return false;
2195         }
2196
2197         return smb2_lease_equal(fsp_client_guid(fsp),
2198                                 &lease->lease_key,
2199                                 &e->client_guid,
2200                                 &e->lease_key);
2201 }
2202
2203 static int map_lease_type_to_oplock(uint32_t lease_type)
2204 {
2205         int result = NO_OPLOCK;
2206
2207         switch (lease_type) {
2208         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2209                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2210                 break;
2211         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2212                 result = EXCLUSIVE_OPLOCK;
2213                 break;
2214         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2215         case SMB2_LEASE_READ:
2216                 result = LEVEL_II_OPLOCK;
2217                 break;
2218         }
2219
2220         return result;
2221 }
2222
2223 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2224                                       struct files_struct *fsp,
2225                                       struct share_mode_lock *lck,
2226                                       int oplock_request,
2227                                       struct smb2_lease *lease)
2228 {
2229         struct share_mode_data *d = lck->data;
2230         bool got_handle_lease = false;
2231         bool got_oplock = false;
2232         uint32_t i;
2233         uint32_t granted;
2234         const struct GUID *client_guid = NULL;
2235         const struct smb2_lease_key *lease_key = NULL;
2236         bool ok;
2237         NTSTATUS status;
2238
2239         if (oplock_request & INTERNAL_OPEN_ONLY) {
2240                 /* No oplocks on internal open. */
2241                 oplock_request = NO_OPLOCK;
2242                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2243                         fsp->oplock_type, fsp_str_dbg(fsp)));
2244         }
2245
2246         if (oplock_request == LEASE_OPLOCK) {
2247                 if (lease == NULL) {
2248                         /*
2249                          * The SMB2 layer should have checked this
2250                          */
2251                         return NT_STATUS_INTERNAL_ERROR;
2252                 }
2253
2254                 granted = lease->lease_state;
2255
2256                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2257                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2258                         granted = SMB2_LEASE_NONE;
2259                 }
2260                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2261                         DEBUG(10, ("No read or write lease requested\n"));
2262                         granted = SMB2_LEASE_NONE;
2263                 }
2264                 if (granted == SMB2_LEASE_WRITE) {
2265                         DEBUG(10, ("pure write lease requested\n"));
2266                         granted = SMB2_LEASE_NONE;
2267                 }
2268                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2269                         DEBUG(10, ("write and handle lease requested\n"));
2270                         granted = SMB2_LEASE_NONE;
2271                 }
2272         } else {
2273                 granted = map_oplock_to_lease_type(
2274                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2275         }
2276
2277         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2278                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2279                         fsp_str_dbg(fsp)));
2280                 granted &= ~SMB2_LEASE_READ;
2281         }
2282
2283         for (i=0; i<d->num_share_modes; i++) {
2284                 struct share_mode_entry *e = &d->share_modes[i];
2285                 uint32_t e_lease_type;
2286
2287                 e_lease_type = get_lease_type(d, e);
2288
2289                 if ((granted & SMB2_LEASE_WRITE) &&
2290                     !is_same_lease(fsp, d, e, lease) &&
2291                     !share_mode_stale_pid(d, i)) {
2292                         /*
2293                          * Can grant only one writer
2294                          */
2295                         granted &= ~SMB2_LEASE_WRITE;
2296                 }
2297
2298                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2299                     !share_mode_stale_pid(d, i)) {
2300                         got_handle_lease = true;
2301                 }
2302
2303                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2304                     !share_mode_stale_pid(d, i)) {
2305                         got_oplock = true;
2306                 }
2307         }
2308
2309         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2310                 bool allow_level2 =
2311                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2312                         lp_level2_oplocks(SNUM(fsp->conn));
2313
2314                 if (!allow_level2) {
2315                         granted = SMB2_LEASE_NONE;
2316                 }
2317         }
2318
2319         if (oplock_request == LEASE_OPLOCK) {
2320                 if (got_oplock) {
2321                         granted &= ~SMB2_LEASE_HANDLE;
2322                 }
2323
2324                 fsp->oplock_type = LEASE_OPLOCK;
2325
2326                 status = grant_fsp_lease(fsp, lck, lease, granted);
2327                 if (!NT_STATUS_IS_OK(status)) {
2328                         return status;
2329
2330                 }
2331                 *lease = fsp->lease->lease;
2332
2333                 lease_key = &fsp->lease->lease.lease_key;
2334                 client_guid = fsp_client_guid(fsp);
2335
2336                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2337         } else {
2338                 if (got_handle_lease) {
2339                         granted = SMB2_LEASE_NONE;
2340                 }
2341
2342                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2343
2344                 status = set_file_oplock(fsp);
2345                 if (!NT_STATUS_IS_OK(status)) {
2346                         /*
2347                          * Could not get the kernel oplock
2348                          */
2349                         fsp->oplock_type = NO_OPLOCK;
2350                 }
2351         }
2352
2353         ok = set_share_mode(
2354                 lck,
2355                 fsp,
2356                 get_current_uid(fsp->conn),
2357                 req ? req->mid : 0,
2358                 fsp->oplock_type,
2359                 client_guid,
2360                 lease_key);
2361         if (!ok) {
2362                 return NT_STATUS_NO_MEMORY;
2363         }
2364
2365         ok = update_num_read_oplocks(fsp, lck);
2366         if (!ok) {
2367                 del_share_mode(lck, fsp);
2368                 return NT_STATUS_INTERNAL_ERROR;
2369         }
2370
2371         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2372                   fsp->oplock_type, fsp_str_dbg(fsp)));
2373
2374         return NT_STATUS_OK;
2375 }
2376
2377 static bool request_timed_out(struct timeval request_time,
2378                               struct timeval timeout)
2379 {
2380         struct timeval now, end_time;
2381         GetTimeOfDay(&now);
2382         end_time = timeval_sum(&request_time, &timeout);
2383         return (timeval_compare(&end_time, &now) < 0);
2384 }
2385
2386 static struct deferred_open_record *deferred_open_record_create(
2387         bool delayed_for_oplocks,
2388         bool async_open,
2389         struct file_id id)
2390 {
2391         struct deferred_open_record *record = NULL;
2392
2393         record = talloc(NULL, struct deferred_open_record);
2394         if (record == NULL) {
2395                 return NULL;
2396         }
2397
2398         *record = (struct deferred_open_record) {
2399                 .delayed_for_oplocks = delayed_for_oplocks,
2400                 .async_open = async_open,
2401                 .id = id,
2402         };
2403
2404         return record;
2405 }
2406
2407 struct defer_open_state {
2408         struct smbXsrv_connection *xconn;
2409         uint64_t mid;
2410 };
2411
2412 static void defer_open_done(struct tevent_req *req);
2413
2414 /**
2415  * Defer an open and watch a locking.tdb record
2416  *
2417  * This defers an open that gets rescheduled once the locking.tdb record watch
2418  * is triggered by a change to the record.
2419  *
2420  * It is used to defer opens that triggered an oplock break and for the SMB1
2421  * sharing violation delay.
2422  **/
2423 static void defer_open(struct share_mode_lock *lck,
2424                        struct timeval request_time,
2425                        struct timeval timeout,
2426                        struct smb_request *req,
2427                        bool delayed_for_oplocks,
2428                        struct file_id id)
2429 {
2430         struct deferred_open_record *open_rec = NULL;
2431         struct timeval abs_timeout;
2432         struct defer_open_state *watch_state;
2433         struct tevent_req *watch_req;
2434         bool ok;
2435
2436         abs_timeout = timeval_sum(&request_time, &timeout);
2437
2438         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2439                   "delayed_for_oplocks [%s] file_id [%s]\n",
2440                   timeval_string(talloc_tos(), &request_time, false),
2441                   timeval_string(talloc_tos(), &abs_timeout, false),
2442                   req->mid,
2443                   delayed_for_oplocks ? "yes" : "no",
2444                   file_id_string_tos(&id));
2445
2446         open_rec = deferred_open_record_create(delayed_for_oplocks,
2447                                                false,
2448                                                id);
2449         if (open_rec == NULL) {
2450                 TALLOC_FREE(lck);
2451                 exit_server("talloc failed");
2452         }
2453
2454         watch_state = talloc(open_rec, struct defer_open_state);
2455         if (watch_state == NULL) {
2456                 exit_server("talloc failed");
2457         }
2458         watch_state->xconn = req->xconn;
2459         watch_state->mid = req->mid;
2460
2461         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2462
2463         watch_req = dbwrap_watched_watch_send(watch_state,
2464                                               req->sconn->ev_ctx,
2465                                               lck->data->record,
2466                                               (struct server_id){0});
2467         if (watch_req == NULL) {
2468                 exit_server("Could not watch share mode record");
2469         }
2470         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2471
2472         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2473         if (!ok) {
2474                 exit_server("tevent_req_set_endtime failed");
2475         }
2476
2477         ok = push_deferred_open_message_smb(req, request_time, timeout,
2478                                             open_rec->id, open_rec);
2479         if (!ok) {
2480                 TALLOC_FREE(lck);
2481                 exit_server("push_deferred_open_message_smb failed");
2482         }
2483 }
2484
2485 static void defer_open_done(struct tevent_req *req)
2486 {
2487         struct defer_open_state *state = tevent_req_callback_data(
2488                 req, struct defer_open_state);
2489         NTSTATUS status;
2490         bool ret;
2491
2492         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2493         TALLOC_FREE(req);
2494         if (!NT_STATUS_IS_OK(status)) {
2495                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2496                           nt_errstr(status)));
2497                 /*
2498                  * Even if it failed, retry anyway. TODO: We need a way to
2499                  * tell a re-scheduled open about that error.
2500                  */
2501         }
2502
2503         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2504
2505         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2506         SMB_ASSERT(ret);
2507         TALLOC_FREE(state);
2508 }
2509
2510 /**
2511  * Actually attempt the kernel oplock polling open.
2512  */
2513
2514 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2515                                       struct tevent_timer *te,
2516                                       struct timeval current_time,
2517                                       void *private_data)
2518 {
2519         bool ok;
2520         struct smb_request *req = (struct smb_request *)private_data;
2521
2522         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2523         if (!ok) {
2524                 exit_server("schedule_deferred_open_message_smb failed");
2525         }
2526         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2527 }
2528
2529 /**
2530  * Reschedule an open for 1 second from now, if not timed out.
2531  **/
2532 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2533                        struct smb_request *req,
2534                        struct file_id id)
2535 {
2536
2537         bool ok;
2538         struct deferred_open_record *open_rec = NULL;
2539         /* Maximum wait time. */
2540         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2541
2542         if (request_timed_out(request_time, timeout)) {
2543                 return;
2544         }
2545
2546         open_rec = deferred_open_record_create(false, false, id);
2547         if (open_rec == NULL) {
2548                 exit_server("talloc failed");
2549         }
2550
2551         ok = push_deferred_open_message_smb(req,
2552                                             request_time,
2553                                             timeout,
2554                                             id,
2555                                             open_rec);
2556         if (!ok) {
2557                 exit_server("push_deferred_open_message_smb failed");
2558         }
2559
2560         /*
2561          * As this timer event is owned by req, it will
2562          * disappear if req it talloc_freed.
2563          */
2564         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2565                                         req,
2566                                         timeval_current_ofs(1, 0),
2567                                         kernel_oplock_poll_open_timer,
2568                                         req);
2569         if (open_rec->te == NULL) {
2570                 exit_server("tevent_add_timer failed");
2571         }
2572
2573         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2574                   timeval_string(talloc_tos(), &request_time, false),
2575                   req->mid,
2576                   file_id_string_tos(&id));
2577 }
2578
2579 /****************************************************************************
2580  On overwrite open ensure that the attributes match.
2581 ****************************************************************************/
2582
2583 static bool open_match_attributes(connection_struct *conn,
2584                                   uint32_t old_dos_attr,
2585                                   uint32_t new_dos_attr,
2586                                   mode_t new_unx_mode,
2587                                   mode_t *returned_unx_mode)
2588 {
2589         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2590
2591         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2592         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2593
2594         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2595            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2596                 *returned_unx_mode = new_unx_mode;
2597         } else {
2598                 *returned_unx_mode = (mode_t)0;
2599         }
2600
2601         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2602                   "new_dos_attr = 0x%x "
2603                   "returned_unx_mode = 0%o\n",
2604                   (unsigned int)old_dos_attr,
2605                   (unsigned int)new_dos_attr,
2606                   (unsigned int)*returned_unx_mode ));
2607
2608         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2609         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2610                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2611                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2612                         return False;
2613                 }
2614         }
2615         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2616                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2617                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2618                         return False;
2619                 }
2620         }
2621         return True;
2622 }
2623
2624 /****************************************************************************
2625  Special FCB or DOS processing in the case of a sharing violation.
2626  Try and find a duplicated file handle.
2627 ****************************************************************************/
2628
2629 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2630                                 connection_struct *conn,
2631                                 files_struct *fsp_to_dup_into,
2632                                 const struct smb_filename *smb_fname,
2633                                 struct file_id id,
2634                                 uint16_t file_pid,
2635                                 uint64_t vuid,
2636                                 uint32_t access_mask,
2637                                 uint32_t share_access,
2638                                 uint32_t create_options)
2639 {
2640         files_struct *fsp;
2641
2642         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2643                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2644
2645         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2646             fsp = file_find_di_next(fsp)) {
2647
2648                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2649                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2650                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2651                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2652                           (unsigned int)fsp->file_pid,
2653                           (unsigned int)fsp->fh->private_options,
2654                           (unsigned int)fsp->access_mask ));
2655
2656                 if (fsp != fsp_to_dup_into &&
2657                     fsp->fh->fd != -1 &&
2658                     fsp->vuid == vuid &&
2659                     fsp->file_pid == file_pid &&
2660                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2661                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2662                     (fsp->access_mask & FILE_WRITE_DATA) &&
2663                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2664                     strequal(fsp->fsp_name->stream_name,
2665                              smb_fname->stream_name)) {
2666                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2667                         break;
2668                 }
2669         }
2670
2671         if (!fsp) {
2672                 return NT_STATUS_NOT_FOUND;
2673         }
2674
2675         /* quite an insane set of semantics ... */
2676         if (is_executable(smb_fname->base_name) &&
2677             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2678                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2679                 return NT_STATUS_INVALID_PARAMETER;
2680         }
2681
2682         /* We need to duplicate this fsp. */
2683         return dup_file_fsp(req, fsp, access_mask, share_access,
2684                             create_options, fsp_to_dup_into);
2685 }
2686
2687 static void schedule_defer_open(struct share_mode_lock *lck,
2688                                 struct file_id id,
2689                                 struct timeval request_time,
2690                                 struct smb_request *req)
2691 {
2692         /* This is a relative time, added to the absolute
2693            request_time value to get the absolute timeout time.
2694            Note that if this is the second or greater time we enter
2695            this codepath for this particular request mid then
2696            request_time is left as the absolute time of the *first*
2697            time this request mid was processed. This is what allows
2698            the request to eventually time out. */
2699
2700         struct timeval timeout;
2701
2702         /* Normally the smbd we asked should respond within
2703          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2704          * the client did, give twice the timeout as a safety
2705          * measure here in case the other smbd is stuck
2706          * somewhere else. */
2707
2708         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2709
2710         if (request_timed_out(request_time, timeout)) {
2711                 return;
2712         }
2713
2714         defer_open(lck, request_time, timeout, req, true, id);
2715 }
2716
2717 /****************************************************************************
2718  Reschedule an open call that went asynchronous.
2719 ****************************************************************************/
2720
2721 static void schedule_async_open_timer(struct tevent_context *ev,
2722                                       struct tevent_timer *te,
2723                                       struct timeval current_time,
2724                                       void *private_data)
2725 {
2726         exit_server("async open timeout");
2727 }
2728
2729 static void schedule_async_open(struct timeval request_time,
2730                                 struct smb_request *req)
2731 {
2732         struct deferred_open_record *open_rec = NULL;
2733         struct timeval timeout = timeval_set(20, 0);
2734         bool ok;
2735
2736         if (request_timed_out(request_time, timeout)) {
2737                 return;
2738         }
2739
2740         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2741         if (open_rec == NULL) {
2742                 exit_server("deferred_open_record_create failed");
2743         }
2744
2745         ok = push_deferred_open_message_smb(req, request_time, timeout,
2746                                             (struct file_id){0}, open_rec);
2747         if (!ok) {
2748                 exit_server("push_deferred_open_message_smb failed");
2749         }
2750
2751         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2752                                         req,
2753                                         timeval_current_ofs(20, 0),
2754                                         schedule_async_open_timer,
2755                                         open_rec);
2756         if (open_rec->te == NULL) {
2757                 exit_server("tevent_add_timer failed");
2758         }
2759 }
2760
2761 /****************************************************************************
2762  Work out what access_mask to use from what the client sent us.
2763 ****************************************************************************/
2764
2765 static NTSTATUS smbd_calculate_maximum_allowed_access(
2766         connection_struct *conn,
2767         const struct smb_filename *smb_fname,
2768         bool use_privs,
2769         uint32_t *p_access_mask)
2770 {
2771         struct security_descriptor *sd;
2772         uint32_t access_granted;
2773         NTSTATUS status;
2774
2775         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2776                 *p_access_mask |= FILE_GENERIC_ALL;
2777                 return NT_STATUS_OK;
2778         }
2779
2780         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2781                                     (SECINFO_OWNER |
2782                                      SECINFO_GROUP |
2783                                      SECINFO_DACL),
2784                                     talloc_tos(), &sd);
2785
2786         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2787                 /*
2788                  * File did not exist
2789                  */
2790                 *p_access_mask = FILE_GENERIC_ALL;
2791                 return NT_STATUS_OK;
2792         }
2793         if (!NT_STATUS_IS_OK(status)) {
2794                 DEBUG(10,("Could not get acl on file %s: %s\n",
2795                           smb_fname_str_dbg(smb_fname),
2796                           nt_errstr(status)));
2797                 return NT_STATUS_ACCESS_DENIED;
2798         }
2799
2800         /*
2801          * If we can access the path to this file, by
2802          * default we have FILE_READ_ATTRIBUTES from the
2803          * containing directory. See the section:
2804          * "Algorithm to Check Access to an Existing File"
2805          * in MS-FSA.pdf.
2806          *
2807          * se_file_access_check()
2808          * also takes care of owner WRITE_DAC and READ_CONTROL.
2809          */
2810         status = se_file_access_check(sd,
2811                                  get_current_nttok(conn),
2812                                  use_privs,
2813                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2814                                  &access_granted);
2815
2816         TALLOC_FREE(sd);
2817
2818         if (!NT_STATUS_IS_OK(status)) {
2819                 DEBUG(10, ("Access denied on file %s: "
2820                            "when calculating maximum access\n",
2821                            smb_fname_str_dbg(smb_fname)));
2822                 return NT_STATUS_ACCESS_DENIED;
2823         }
2824         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2825
2826         if (!(access_granted & DELETE_ACCESS)) {
2827                 if (can_delete_file_in_directory(conn, smb_fname)) {
2828                         *p_access_mask |= DELETE_ACCESS;
2829                 }
2830         }
2831
2832         return NT_STATUS_OK;
2833 }
2834
2835 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2836                                     const struct smb_filename *smb_fname,
2837                                     bool use_privs,
2838                                     uint32_t access_mask,
2839                                     uint32_t *access_mask_out)
2840 {
2841         NTSTATUS status;
2842         uint32_t orig_access_mask = access_mask;
2843         uint32_t rejected_share_access;
2844
2845         if (access_mask & SEC_MASK_INVALID) {
2846                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2847                           access_mask);
2848                 return NT_STATUS_ACCESS_DENIED;
2849         }
2850
2851         /*
2852          * Convert GENERIC bits to specific bits.
2853          */
2854
2855         se_map_generic(&access_mask, &file_generic_mapping);
2856
2857         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2858         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2859
2860                 status = smbd_calculate_maximum_allowed_access(
2861                         conn, smb_fname, use_privs, &access_mask);
2862
2863                 if (!NT_STATUS_IS_OK(status)) {
2864                         return status;
2865                 }
2866
2867                 access_mask &= conn->share_access;
2868         }
2869
2870         rejected_share_access = access_mask & ~(conn->share_access);
2871
2872         if (rejected_share_access) {
2873                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2874                         "file %s: rejected by share access mask[0x%08X] "
2875                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2876                         smb_fname_str_dbg(smb_fname),
2877                         conn->share_access,
2878                         orig_access_mask, access_mask,
2879                         rejected_share_access));
2880                 return NT_STATUS_ACCESS_DENIED;
2881         }
2882
2883         *access_mask_out = access_mask;
2884         return NT_STATUS_OK;
2885 }
2886
2887 /****************************************************************************
2888  Remove the deferred open entry under lock.
2889 ****************************************************************************/
2890
2891 /****************************************************************************
2892  Return true if this is a state pointer to an asynchronous create.
2893 ****************************************************************************/
2894
2895 bool is_deferred_open_async(const struct deferred_open_record *rec)
2896 {
2897         return rec->async_open;
2898 }
2899
2900 static bool clear_ads(uint32_t create_disposition)
2901 {
2902         bool ret = false;
2903
2904         switch (create_disposition) {
2905         case FILE_SUPERSEDE:
2906         case FILE_OVERWRITE_IF:
2907         case FILE_OVERWRITE:
2908                 ret = true;
2909                 break;
2910         default:
2911                 break;
2912         }
2913         return ret;
2914 }
2915
2916 static int disposition_to_open_flags(uint32_t create_disposition)
2917 {
2918         int ret = 0;
2919
2920         /*
2921          * Currently we're using FILE_SUPERSEDE as the same as
2922          * FILE_OVERWRITE_IF but they really are
2923          * different. FILE_SUPERSEDE deletes an existing file
2924          * (requiring delete access) then recreates it.
2925          */
2926
2927         switch (create_disposition) {
2928         case FILE_SUPERSEDE:
2929         case FILE_OVERWRITE_IF:
2930                 /*
2931                  * If file exists replace/overwrite. If file doesn't
2932                  * exist create.
2933                  */
2934                 ret = O_CREAT|O_TRUNC;
2935                 break;
2936
2937         case FILE_OPEN:
2938                 /*
2939                  * If file exists open. If file doesn't exist error.
2940                  */
2941                 ret = 0;
2942                 break;
2943
2944         case FILE_OVERWRITE:
2945                 /*
2946                  * If file exists overwrite. If file doesn't exist
2947                  * error.
2948                  */
2949                 ret = O_TRUNC;
2950                 break;
2951
2952         case FILE_CREATE:
2953                 /*
2954                  * If file exists error. If file doesn't exist create.
2955                  */
2956                 ret = O_CREAT|O_EXCL;
2957                 break;
2958
2959         case FILE_OPEN_IF:
2960                 /*
2961                  * If file exists open. If file doesn't exist create.
2962                  */
2963                 ret = O_CREAT;
2964                 break;
2965         }
2966         return ret;
2967 }
2968
2969 static int calculate_open_access_flags(uint32_t access_mask,
2970                                        uint32_t private_flags)
2971 {
2972         bool need_write, need_read;
2973
2974         /*
2975          * Note that we ignore the append flag as append does not
2976          * mean the same thing under DOS and Unix.
2977          */
2978
2979         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2980         if (!need_write) {
2981                 return O_RDONLY;
2982         }
2983
2984         /* DENY_DOS opens are always underlying read-write on the
2985            file handle, no matter what the requested access mask
2986            says. */
2987
2988         need_read =
2989                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2990                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2991                                 FILE_READ_EA|FILE_EXECUTE));
2992
2993         if (!need_read) {
2994                 return O_WRONLY;
2995         }
2996         return O_RDWR;
2997 }
2998
2999 /****************************************************************************
3000  Open a file with a share mode. Passed in an already created files_struct *.
3001 ****************************************************************************/
3002
3003 static NTSTATUS open_file_ntcreate(connection_struct *conn,
3004                             struct smb_request *req,
3005                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
3006                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
3007                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
3008                             uint32_t create_options,    /* options such as delete on close. */
3009                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3010                             int oplock_request,         /* internal Samba oplock codes. */
3011                             struct smb2_lease *lease,
3012                                                         /* Information (FILE_EXISTS etc.) */
3013                             uint32_t private_flags,     /* Samba specific flags. */
3014                             int *pinfo,
3015                             files_struct *fsp)
3016 {
3017         struct smb_filename *smb_fname = fsp->fsp_name;
3018         int flags=0;
3019         int flags2=0;
3020         bool file_existed = VALID_STAT(smb_fname->st);
3021         bool def_acl = False;
3022         bool posix_open = False;
3023         bool new_file_created = False;
3024         bool first_open_attempt = true;
3025         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
3026         mode_t new_unx_mode = (mode_t)0;
3027         mode_t unx_mode = (mode_t)0;
3028         int info;
3029         uint32_t existing_dos_attributes = 0;
3030         struct timeval request_time = timeval_zero();
3031         struct share_mode_lock *lck = NULL;
3032         uint32_t open_access_mask = access_mask;
3033         NTSTATUS status;
3034         char *parent_dir;
3035         SMB_STRUCT_STAT saved_stat = smb_fname->st;
3036         struct timespec old_write_time;
3037         struct file_id id;
3038
3039         if (conn->printer) {
3040                 /*
3041                  * Printers are handled completely differently.
3042                  * Most of the passed parameters are ignored.
3043                  */
3044
3045                 if (pinfo) {
3046                         *pinfo = FILE_WAS_CREATED;
3047                 }
3048
3049                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
3050                            smb_fname_str_dbg(smb_fname)));
3051
3052                 if (!req) {
3053                         DEBUG(0,("open_file_ntcreate: printer open without "
3054                                 "an SMB request!\n"));
3055                         return NT_STATUS_INTERNAL_ERROR;
3056                 }
3057
3058                 return print_spool_open(fsp, smb_fname->base_name,
3059                                         req->vuid);
3060         }
3061
3062         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3063                             NULL)) {
3064                 return NT_STATUS_NO_MEMORY;
3065         }
3066
3067         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3068                 posix_open = True;
3069                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3070                 new_dos_attributes = 0;
3071         } else {
3072                 /* Windows allows a new file to be created and
3073                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3074                    sent by the client. Do the same. */
3075
3076                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3077
3078                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3079                  * created new. */
3080                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3081                                      smb_fname, parent_dir);
3082         }
3083
3084         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3085                    "access_mask=0x%x share_access=0x%x "
3086                    "create_disposition = 0x%x create_options=0x%x "
3087                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3088                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3089                    access_mask, share_access, create_disposition,
3090                    create_options, (unsigned int)unx_mode, oplock_request,
3091                    (unsigned int)private_flags));
3092
3093         if (req == NULL) {
3094                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3095                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3096         } else {
3097                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3098                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3099         }
3100
3101         /*
3102          * Only non-internal opens can be deferred at all
3103          */
3104
3105         if (req) {
3106                 struct deferred_open_record *open_rec;
3107                 if (get_deferred_open_message_state(req,
3108                                 &request_time,
3109                                 &open_rec)) {
3110                         /* Remember the absolute time of the original
3111                            request with this mid. We'll use it later to
3112                            see if this has timed out. */
3113
3114                         /* If it was an async create retry, the file
3115                            didn't exist. */
3116
3117                         if (is_deferred_open_async(open_rec)) {
3118                                 SET_STAT_INVALID(smb_fname->st);
3119                                 file_existed = false;
3120                         }
3121
3122                         /* Ensure we don't reprocess this message. */
3123                         remove_deferred_open_message_smb(req->xconn, req->mid);
3124
3125                         first_open_attempt = false;
3126                 }
3127         }
3128
3129         if (!posix_open) {
3130                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3131                 if (file_existed) {
3132                         /*
3133                          * Only use strored DOS attributes for checks
3134                          * against requested attributes (below via
3135                          * open_match_attributes()), cf bug #11992
3136                          * for details. -slow
3137                          */
3138                         uint32_t attr = 0;
3139
3140                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3141                         if (NT_STATUS_IS_OK(status)) {
3142                                 existing_dos_attributes = attr;
3143                         }
3144                 }
3145         }
3146
3147         /* ignore any oplock requests if oplocks are disabled */
3148         if (!lp_oplocks(SNUM(conn)) ||
3149             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3150                 /* Mask off everything except the private Samba bits. */
3151                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3152         }
3153
3154         /* this is for OS/2 long file names - say we don't support them */
3155         if (req != NULL && !req->posix_pathnames &&
3156                         strstr(smb_fname->base_name,".+,;=[].")) {
3157                 /* OS/2 Workplace shell fix may be main code stream in a later
3158                  * release. */
3159                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3160                          "supported.\n"));
3161                 if (use_nt_status()) {
3162                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3163                 }
3164                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3165         }
3166
3167         switch( create_disposition ) {
3168                 case FILE_OPEN:
3169                         /* If file exists open. If file doesn't exist error. */
3170                         if (!file_existed) {
3171                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
3172                                          "requested for file %s and file "
3173                                          "doesn't exist.\n",
3174                                          smb_fname_str_dbg(smb_fname)));
3175                                 errno = ENOENT;
3176                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3177                         }
3178                         break;
3179
3180                 case FILE_OVERWRITE:
3181                         /* If file exists overwrite. If file doesn't exist
3182                          * error. */
3183                         if (!file_existed) {
3184                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3185                                          "requested for file %s and file "
3186                                          "doesn't exist.\n",
3187                                          smb_fname_str_dbg(smb_fname) ));
3188                                 errno = ENOENT;
3189                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3190                         }
3191                         break;
3192
3193                 case FILE_CREATE:
3194                         /* If file exists error. If file doesn't exist
3195                          * create. */
3196                         if (file_existed) {
3197                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3198                                          "requested for file %s and file "
3199                                          "already exists.\n",
3200                                          smb_fname_str_dbg(smb_fname)));
3201                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3202                                         errno = EISDIR;
3203                                 } else {
3204                                         errno = EEXIST;
3205                                 }
3206                                 return map_nt_error_from_unix(errno);
3207                         }
3208                         break;
3209
3210                 case FILE_SUPERSEDE:
3211                 case FILE_OVERWRITE_IF:
3212                 case FILE_OPEN_IF:
3213                         break;
3214                 default:
3215                         return NT_STATUS_INVALID_PARAMETER;
3216         }
3217
3218         flags2 = disposition_to_open_flags(create_disposition);
3219
3220         /* We only care about matching attributes on file exists and
3221          * overwrite. */
3222
3223         if (!posix_open && file_existed &&
3224             ((create_disposition == FILE_OVERWRITE) ||
3225              (create_disposition == FILE_OVERWRITE_IF))) {
3226                 if (!open_match_attributes(conn, existing_dos_attributes,
3227                                            new_dos_attributes,
3228                                            unx_mode, &new_unx_mode)) {
3229                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3230                                  "for file %s (%x %x) (0%o, 0%o)\n",
3231                                  smb_fname_str_dbg(smb_fname),
3232                                  existing_dos_attributes,
3233                                  new_dos_attributes,
3234                                  (unsigned int)smb_fname->st.st_ex_mode,
3235                                  (unsigned int)unx_mode ));
3236                         errno = EACCES;
3237                         return NT_STATUS_ACCESS_DENIED;
3238                 }
3239         }
3240
3241         status = smbd_calculate_access_mask(conn, smb_fname,
3242                                         false,
3243                                         access_mask,
3244                                         &access_mask);
3245         if (!NT_STATUS_IS_OK(status)) {
3246                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3247                         "on file %s returned %s\n",
3248                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3249                 return status;
3250         }
3251
3252         open_access_mask = access_mask;
3253
3254         if (flags2 & O_TRUNC) {
3255                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3256         }
3257
3258         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3259                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3260                     access_mask));
3261
3262         /*
3263          * Note that we ignore the append flag as append does not
3264          * mean the same thing under DOS and Unix.
3265          */
3266
3267         flags = calculate_open_access_flags(access_mask, private_flags);
3268
3269         /*
3270          * Currently we only look at FILE_WRITE_THROUGH for create options.
3271          */
3272
3273 #if defined(O_SYNC)
3274         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3275                 flags2 |= O_SYNC;
3276         }
3277 #endif /* O_SYNC */
3278
3279         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3280                 flags2 |= O_APPEND;
3281         }
3282
3283         if (!posix_open && !CAN_WRITE(conn)) {
3284                 /*
3285                  * We should really return a permission denied error if either
3286                  * O_CREAT or O_TRUNC are set, but for compatibility with
3287                  * older versions of Samba we just AND them out.
3288                  */
3289                 flags2 &= ~(O_CREAT|O_TRUNC);
3290         }
3291
3292         if (lp_kernel_oplocks(SNUM(conn))) {
3293                 /*
3294                  * With kernel oplocks the open breaking an oplock
3295                  * blocks until the oplock holder has given up the
3296                  * oplock or closed the file. We prevent this by always
3297                  * trying to open the file with O_NONBLOCK (see "man
3298                  * fcntl" on Linux).
3299                  *
3300                  * If a process that doesn't use the smbd open files
3301                  * database or communication methods holds a kernel
3302                  * oplock we must periodically poll for available open
3303                  * using O_NONBLOCK.
3304                  */
3305                 flags2 |= O_NONBLOCK;
3306         }
3307
3308         /*
3309          * Ensure we can't write on a read-only share or file.
3310          */
3311
3312         if (flags != O_RDONLY && file_existed &&
3313             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3314                 DEBUG(5,("open_file_ntcreate: write access requested for "
3315                          "file %s on read only %s\n",
3316                          smb_fname_str_dbg(smb_fname),
3317                          !CAN_WRITE(conn) ? "share" : "file" ));
3318                 errno = EACCES;
3319                 return NT_STATUS_ACCESS_DENIED;
3320         }
3321
3322         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3323         fsp->share_access = share_access;
3324         fsp->fh->private_options = private_flags;
3325         fsp->access_mask = open_access_mask; /* We change this to the
3326                                               * requested access_mask after
3327                                               * the open is done. */
3328         if (posix_open) {
3329                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3330         }
3331
3332         if (timeval_is_zero(&request_time)) {
3333                 request_time = fsp->open_time;
3334         }
3335
3336         if ((create_options & FILE_DELETE_ON_CLOSE) &&
3337                         (flags2 & O_CREAT) &&
3338                         !file_existed) {
3339                 /* Delete on close semantics for new files. */
3340                 status = can_set_delete_on_close(fsp,
3341                                                 new_dos_attributes);
3342                 if (!NT_STATUS_IS_OK(status)) {
3343                         fd_close(fsp);
3344                         return status;
3345                 }
3346         }
3347
3348         /*
3349          * Ensure we pay attention to default ACLs on directories if required.
3350          */
3351
3352         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3353             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3354                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3355         }
3356
3357         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3358                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3359                  (unsigned int)flags, (unsigned int)flags2,
3360                  (unsigned int)unx_mode, (unsigned int)access_mask,
3361                  (unsigned int)open_access_mask));
3362
3363         fsp_open = open_file(fsp, conn, req, parent_dir,
3364                              flags|flags2, unx_mode, access_mask,
3365                              open_access_mask, &new_file_created);
3366
3367         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3368                 bool delay;
3369
3370                 /*
3371                  * This handles the kernel oplock case:
3372                  *
3373                  * the file has an active kernel oplock and the open() returned
3374                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3375                  *
3376                  * "Samba locking.tdb oplocks" are handled below after acquiring
3377                  * the sharemode lock with get_share_mode_lock().
3378                  */
3379                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3380                         DEBUG(10, ("FIFO busy\n"));
3381                         return NT_STATUS_NETWORK_BUSY;
3382                 }
3383                 if (req == NULL) {
3384                         DEBUG(10, ("Internal open busy\n"));
3385                         return NT_STATUS_NETWORK_BUSY;
3386                 }
3387
3388                 /*
3389                  * From here on we assume this is an oplock break triggered
3390                  */
3391
3392                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3393                 if (lck == NULL) {
3394                         /*
3395                          * No oplock from Samba around. Set up a poll every 1
3396                          * second to retry a non-blocking open until the time
3397                          * expires.
3398                          */
3399                         setup_kernel_oplock_poll_open(request_time,
3400                                                 req,
3401                                                 fsp->file_id);
3402                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3403                                 "Retrying with poll\n");
3404                         return NT_STATUS_SHARING_VIOLATION;
3405                 }
3406
3407                 if (!validate_oplock_types(lck)) {
3408                         smb_panic("validate_oplock_types failed");
3409                 }
3410
3411                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3412                                          create_disposition,
3413                                          first_open_attempt);
3414                 if (delay) {
3415                         schedule_defer_open(lck, fsp->file_id, request_time,
3416                                             req);
3417                         TALLOC_FREE(lck);
3418                         DEBUG(10, ("Sent oplock break request to kernel "
3419                                    "oplock holder\n"));
3420                         return NT_STATUS_SHARING_VIOLATION;
3421                 }
3422
3423                 /*
3424                  * No oplock from Samba around. Set up a poll every 1
3425                  * second to retry a non-blocking open until the time
3426                  * expires.
3427                  */
3428                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3429
3430                 TALLOC_FREE(lck);
3431                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3432                         "Retrying with poll\n");
3433                 return NT_STATUS_SHARING_VIOLATION;
3434         }
3435
3436         if (!NT_STATUS_IS_OK(fsp_open)) {
3437                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3438                         schedule_async_open(request_time, req);
3439                 }
3440                 return fsp_open;
3441         }
3442
3443         if (new_file_created) {
3444                 /*
3445                  * As we atomically create using O_CREAT|O_EXCL,
3446                  * then if new_file_created is true, then
3447                  * file_existed *MUST* have been false (even
3448                  * if the file was previously detected as being
3449                  * there).
3450                  */
3451                 file_existed = false;
3452         }
3453
3454         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3455                 /*
3456                  * The file did exist, but some other (local or NFS)
3457                  * process either renamed/unlinked and re-created the
3458                  * file with different dev/ino after we walked the path,
3459                  * but before we did the open. We could retry the
3460                  * open but it's a rare enough case it's easier to
3461                  * just fail the open to prevent creating any problems
3462                  * in the open file db having the wrong dev/ino key.
3463                  */
3464                 fd_close(fsp);
3465                 DBG_WARNING("file %s - dev/ino mismatch. "
3466                             "Old (dev=%ju, ino=%ju). "
3467                             "New (dev=%ju, ino=%ju). Failing open "
3468                             "with NT_STATUS_ACCESS_DENIED.\n",
3469                             smb_fname_str_dbg(smb_fname),
3470                             (uintmax_t)saved_stat.st_ex_dev,
3471                             (uintmax_t)saved_stat.st_ex_ino,
3472                             (uintmax_t)smb_fname->st.st_ex_dev,
3473                             (uintmax_t)smb_fname->st.st_ex_ino);
3474                 return NT_STATUS_ACCESS_DENIED;
3475         }
3476
3477         old_write_time = smb_fname->st.st_ex_mtime;
3478
3479         /*
3480          * Deal with the race condition where two smbd's detect the
3481          * file doesn't exist and do the create at the same time. One
3482          * of them will win and set a share mode, the other (ie. this
3483          * one) should check if the requested share mode for this
3484          * create is allowed.
3485          */
3486
3487         /*
3488          * Now the file exists and fsp is successfully opened,
3489          * fsp->dev and fsp->inode are valid and should replace the
3490          * dev=0,inode=0 from a non existent file. Spotted by
3491          * Nadav Danieli <nadavd@exanet.com>. JRA.
3492          */
3493
3494         id = fsp->file_id;
3495
3496         lck = get_share_mode_lock(talloc_tos(), id,
3497                                   conn->connectpath,
3498                                   smb_fname, &old_write_time);
3499
3500         if (lck == NULL) {
3501                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3502                           "mode lock for %s\n",
3503                           smb_fname_str_dbg(smb_fname)));
3504                 fd_close(fsp);
3505                 return NT_STATUS_SHARING_VIOLATION;
3506         }
3507
3508         /* Get the types we need to examine. */
3509         if (!validate_oplock_types(lck)) {
3510                 smb_panic("validate_oplock_types failed");
3511         }
3512
3513         if (has_delete_on_close(lck, fsp->name_hash)) {
3514                 TALLOC_FREE(lck);
3515                 fd_close(fsp);
3516                 return NT_STATUS_DELETE_PENDING;
3517         }
3518
3519         status = open_mode_check(conn, lck,
3520                                  access_mask, share_access);
3521
3522         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3523             (lck->data->num_share_modes > 0)) {
3524                 /*
3525                  * This comes from ancient times out of open_mode_check. I
3526                  * have no clue whether this is still necessary. I can't think
3527                  * of a case where this would actually matter further down in
3528                  * this function. I leave it here for further investigation
3529                  * :-)
3530                  */
3531                 file_existed = true;
3532         }
3533
3534         if (req != NULL) {
3535                 /*
3536                  * Handle oplocks, deferring the request if delay_for_oplock()
3537                  * triggered a break message and we have to wait for the break
3538                  * response.
3539                  */
3540                 bool delay;
3541                 bool sharing_violation = NT_STATUS_EQUAL(
3542                         status, NT_STATUS_SHARING_VIOLATION);
3543
3544                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3545                                          sharing_violation,
3546                                          create_disposition,
3547                                          first_open_attempt);
3548                 if (delay) {
3549                         schedule_defer_open(lck, fsp->file_id,
3550                                             request_time, req);
3551                         TALLOC_FREE(lck);
3552                         fd_close(fsp);
3553                         return NT_STATUS_SHARING_VIOLATION;
3554                 }
3555         }
3556
3557         if (!NT_STATUS_IS_OK(status)) {
3558                 uint32_t can_access_mask;
3559                 bool can_access = True;
3560
3561                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3562
3563                 /* Check if this can be done with the deny_dos and fcb
3564                  * calls. */
3565                 if (private_flags &
3566                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3567                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3568                         if (req == NULL) {
3569                                 DEBUG(0, ("DOS open without an SMB "
3570                                           "request!\n"));
3571                                 TALLOC_FREE(lck);
3572                                 fd_close(fsp);
3573                                 return NT_STATUS_INTERNAL_ERROR;
3574                         }
3575
3576                         /* Use the client requested access mask here,
3577                          * not the one we open with. */
3578                         status = fcb_or_dos_open(req,
3579                                                  conn,
3580                                                  fsp,
3581                                                  smb_fname,
3582                                                  id,
3583                                                  req->smbpid,
3584                                                  req->vuid,
3585                                                  access_mask,
3586                                                  share_access,
3587                                                  create_options);
3588
3589                         if (NT_STATUS_IS_OK(status)) {
3590                                 TALLOC_FREE(lck);
3591                                 if (pinfo) {
3592                                         *pinfo = FILE_WAS_OPENED;
3593                                 }
3594                                 return NT_STATUS_OK;
3595                         }
3596                 }
3597
3598                 /*
3599                  * This next line is a subtlety we need for
3600                  * MS-Access. If a file open will fail due to share
3601                  * permissions and also for security (access) reasons,
3602                  * we need to return the access failed error, not the
3603                  * share error. We can't open the file due to kernel
3604                  * oplock deadlock (it's possible we failed above on
3605                  * the open_mode_check()) so use a userspace check.
3606                  */
3607
3608                 if (flags & O_RDWR) {
3609                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3610                 } else if (flags & O_WRONLY) {
3611                         can_access_mask = FILE_WRITE_DATA;
3612                 } else {
3613                         can_access_mask = FILE_READ_DATA;
3614                 }
3615
3616                 if (((can_access_mask & FILE_WRITE_DATA) &&
3617                      !CAN_WRITE(conn)) ||
3618                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3619                                                               smb_fname,
3620                                                               false,
3621                                                               can_access_mask))) {
3622                         can_access = False;
3623                 }
3624
3625                 /*
3626                  * If we're returning a share violation, ensure we
3627                  * cope with the braindead 1 second delay (SMB1 only).
3628                  */
3629
3630                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3631                     !conn->sconn->using_smb2 &&
3632                     lp_defer_sharing_violations()) {
3633                         struct timeval timeout;
3634                         int timeout_usecs;
3635
3636                         /* this is a hack to speed up torture tests
3637                            in 'make test' */
3638                         timeout_usecs = lp_parm_int(SNUM(conn),
3639                                                     "smbd","sharedelay",
3640                                                     SHARING_VIOLATION_USEC_WAIT);
3641
3642                         /* This is a relative time, added to the absolute
3643                            request_time value to get the absolute timeout time.
3644                            Note that if this is the second or greater time we enter
3645                            this codepath for this particular request mid then
3646                            request_time is left as the absolute time of the *first*
3647                            time this request mid was processed. This is what allows
3648                            the request to eventually time out. */
3649
3650                         timeout = timeval_set(0, timeout_usecs);
3651
3652                         if (!request_timed_out(request_time, timeout)) {
3653                                 defer_open(lck, request_time, timeout, req,
3654                                            false, id);
3655                         }
3656                 }
3657
3658                 TALLOC_FREE(lck);
3659                 fd_close(fsp);
3660                 if (can_access) {
3661                         /*
3662                          * We have detected a sharing violation here
3663                          * so return the correct error code
3664                          */
3665                         status = NT_STATUS_SHARING_VIOLATION;
3666                 } else {
3667                         status = NT_STATUS_ACCESS_DENIED;
3668                 }
3669                 return status;
3670         }
3671
3672         /* Should we atomically (to the client at least) truncate ? */
3673         if ((!new_file_created) &&
3674             (flags2 & O_TRUNC) &&
3675             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3676                 int ret;
3677
3678                 ret = vfs_set_filelen(fsp, 0);
3679                 if (ret != 0) {
3680                         status = map_nt_error_from_unix(errno);
3681                         TALLOC_FREE(lck);
3682                         fd_close(fsp);
3683                         return status;
3684                 }
3685         }
3686
3687         /*
3688          * We have the share entry *locked*.....
3689          */
3690
3691         /* Delete streams if create_disposition requires it */
3692         if (!new_file_created && clear_ads(create_disposition) &&
3693             !is_ntfs_stream_smb_fname(smb_fname)) {
3694                 status = delete_all_streams(conn, smb_fname);
3695                 if (!NT_STATUS_IS_OK(status)) {
3696                         TALLOC_FREE(lck);
3697                         fd_close(fsp);
3698                         return status;
3699                 }
3700         }
3701
3702         /* note that we ignore failure for the following. It is
3703            basically a hack for NFS, and NFS will never set one of
3704            these only read them. Nobody but Samba can ever set a deny
3705            mode and we have already checked our more authoritative
3706            locking database for permission to set this deny mode. If
3707            the kernel refuses the operations then the kernel is wrong.
3708            note that GPFS supports it as well - jmcd */
3709
3710         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3711                 int ret_flock;
3712                 /*
3713                  * Beware: streams implementing VFS modules may
3714                  * implement streams in a way that fsp will have the
3715                  * basefile open in the fsp fd, so lacking a distinct
3716                  * fd for the stream kernel_flock will apply on the
3717                  * basefile which is wrong. The actual check is
3718                  * deffered to the VFS module implementing the
3719                  * kernel_flock call.
3720                  */
3721                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3722                 if(ret_flock == -1 ){
3723
3724                         TALLOC_FREE(lck);
3725                         fd_close(fsp);
3726
3727                         return NT_STATUS_SHARING_VIOLATION;
3728                 }
3729
3730                 fsp->kernel_share_modes_taken = true;
3731         }
3732
3733         /*
3734          * At this point onwards, we can guarantee that the share entry
3735          * is locked, whether we created the file or not, and that the
3736          * deny mode is compatible with all current opens.
3737          */
3738
3739         /*
3740          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3741          * but we don't have to store this - just ignore it on access check.
3742          */
3743         if (conn->sconn->using_smb2) {
3744                 /*
3745                  * SMB2 doesn't return it (according to Microsoft tests).
3746                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3747                  * File created with access = 0x7 (Read, Write, Delete)
3748                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3749                  */
3750                 fsp->access_mask = access_mask;
3751         } else {
3752                 /* But SMB1 does. */
3753                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3754         }
3755
3756         if (file_existed) {
3757                 /*
3758                  * stat opens on existing files don't get oplocks.
3759                  * They can get leases.
3760                  *
3761                  * Note that we check for stat open on the *open_access_mask*,
3762                  * i.e. the access mask we actually used to do the open,
3763                  * not the one the client asked for (which is in
3764                  * fsp->access_mask). This is due to the fact that
3765                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3766                  * which adds FILE_WRITE_DATA to open_access_mask.
3767                  */
3768                 if (is_stat_open(open_access_mask) && lease == NULL) {
3769                         oplock_request = NO_OPLOCK;
3770                 }
3771         }
3772
3773         if (new_file_created) {
3774                 info = FILE_WAS_CREATED;
3775         } else {
3776                 if (flags2 & O_TRUNC) {
3777                         info = FILE_WAS_OVERWRITTEN;
3778                 } else {
3779                         info = FILE_WAS_OPENED;
3780                 }
3781         }
3782
3783         if (pinfo) {
3784                 *pinfo = info;
3785         }
3786
3787         /*
3788          * Setup the oplock info in both the shared memory and
3789          * file structs.
3790          */
3791         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3792         if (!NT_STATUS_IS_OK(status)) {
3793                 TALLOC_FREE(lck);
3794                 fd_close(fsp);
3795                 return status;
3796         }
3797
3798         /* Handle strange delete on close create semantics. */
3799         if (create_options & FILE_DELETE_ON_CLOSE) {
3800                 if (!new_file_created) {
3801                         status = can_set_delete_on_close(fsp,
3802                                          existing_dos_attributes);
3803
3804                         if (!NT_STATUS_IS_OK(status)) {
3805                                 /* Remember to delete the mode we just added. */
3806                                 del_share_mode(lck, fsp);
3807                                 TALLOC_FREE(lck);
3808                                 fd_close(fsp);
3809                                 return status;
3810                         }
3811                 }
3812                 /* Note that here we set the *initial* delete on close flag,
3813                    not the regular one. The magic gets handled in close. */
3814                 fsp->initial_delete_on_close = True;
3815         }
3816
3817         if (info != FILE_WAS_OPENED) {
3818                 /* Overwritten files should be initially set as archive */
3819                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3820                     lp_store_dos_attributes(SNUM(conn))) {
3821                         if (!posix_open) {
3822                                 if (file_set_dosmode(conn, smb_fname,
3823                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3824                                             parent_dir, true) == 0) {
3825                                         unx_mode = smb_fname->st.st_ex_mode;
3826                                 }
3827                         }
3828                 }
3829         }
3830
3831         /* Determine sparse flag. */
3832         if (posix_open) {
3833                 /* POSIX opens are sparse by default. */
3834                 fsp->is_sparse = true;
3835         } else {
3836                 fsp->is_sparse = (file_existed &&
3837                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3838         }
3839
3840         /*
3841          * Take care of inherited ACLs on created files - if default ACL not
3842          * selected.
3843          */
3844
3845         if (!posix_open && new_file_created && !def_acl) {
3846                 if (unx_mode != smb_fname->st.st_ex_mode) {
3847                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3848                         if (ret == -1) {
3849                                 DBG_INFO("failed to reset "
3850                                   "attributes of file %s to 0%o\n",
3851                                   smb_fname_str_dbg(smb_fname),
3852                                   (unsigned int)unx_mode);
3853                         }
3854                 }
3855
3856         } else if (new_unx_mode) {
3857                 /*
3858                  * We only get here in the case of:
3859                  *
3860                  * a). Not a POSIX open.
3861                  * b). File already existed.
3862                  * c). File was overwritten.
3863                  * d). Requested DOS attributes didn't match
3864                  *     the DOS attributes on the existing file.
3865                  *
3866                  * In that case new_unx_mode has been set
3867                  * equal to the calculated mode (including
3868                  * possible inheritance of the mode from the
3869                  * containing directory).
3870                  *
3871                  * Note this mode was calculated with the
3872                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3873                  * so the mode change here is suitable for
3874                  * an overwritten file.
3875                  */
3876
3877                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3878                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3879                         if (ret == -1) {
3880                                 DBG_INFO("failed to reset "
3881                                   "attributes of file %s to 0%o\n",
3882                                   smb_fname_str_dbg(smb_fname),
3883                                   (unsigned int)new_unx_mode);
3884                         }
3885                 }
3886         }
3887
3888         {
3889                 /*
3890                  * Deal with other opens having a modified write time.
3891                  */
3892                 struct timespec write_time = get_share_mode_write_time(lck);
3893
3894                 if (!null_timespec(write_time)) {
3895                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3896                 }
3897         }
3898
3899         TALLOC_FREE(lck);
3900
3901         return NT_STATUS_OK;
3902 }
3903
3904 static NTSTATUS mkdir_internal(connection_struct *conn,
3905                                struct smb_filename *smb_dname,
3906                                uint32_t file_attributes)
3907 {
3908         mode_t mode;
3909         char *parent_dir = NULL;
3910         NTSTATUS status;
3911         bool posix_open = false;
3912         bool need_re_stat = false;
3913         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3914
3915         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3916                 DEBUG(5,("mkdir_internal: failing share access "
3917                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3918                 return NT_STATUS_ACCESS_DENIED;
3919         }
3920
3921         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3922                             NULL)) {
3923                 return NT_STATUS_NO_MEMORY;
3924         }
3925
3926         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3927                 posix_open = true;
3928                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3929         } else {
3930                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3931         }
3932
3933         status = check_parent_access(conn,
3934                                         smb_dname,
3935                                         access_mask);
3936         if(!NT_STATUS_IS_OK(status)) {
3937                 DEBUG(5,("mkdir_internal: check_parent_access "
3938                         "on directory %s for path %s returned %s\n",
3939                         parent_dir,
3940                         smb_dname->base_name,
3941                         nt_errstr(status) ));
3942                 return status;
3943         }
3944
3945         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3946                 return map_nt_error_from_unix(errno);
3947         }
3948
3949         /* Ensure we're checking for a symlink here.... */
3950         /* We don't want to get caught by a symlink racer. */
3951
3952         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3953                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3954                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3955                 return map_nt_error_from_unix(errno);
3956         }
3957
3958         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3959                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3960                           smb_fname_str_dbg(smb_dname)));
3961                 return NT_STATUS_NOT_A_DIRECTORY;
3962         }
3963
3964         if (lp_store_dos_attributes(SNUM(conn))) {
3965                 if (!posix_open) {
3966                         file_set_dosmode(conn, smb_dname,
3967                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3968                                          parent_dir, true);
3969                 }
3970         }
3971
3972         if (lp_inherit_permissions(SNUM(conn))) {
3973                 inherit_access_posix_acl(conn, parent_dir,
3974                                          smb_dname, mode);
3975                 need_re_stat = true;
3976         }
3977
3978         if (!posix_open) {
3979                 /*
3980                  * Check if high bits should have been set,
3981                  * then (if bits are missing): add them.
3982                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3983                  * dir.
3984                  */
3985                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3986                     (mode & ~smb_dname->st.st_ex_mode)) {
3987                         SMB_VFS_CHMOD(conn, smb_dname,
3988                                       (smb_dname->st.st_ex_mode |
3989                                           (mode & ~smb_dname->st.st_ex_mode)));
3990                         need_re_stat = true;
3991                 }
3992         }
3993
3994         /* Change the owner if required. */
3995         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
3996                 change_dir_owner_to_parent(conn, parent_dir,
3997                                            smb_dname,
3998                                            &smb_dname->st);
3999                 need_re_stat = true;
4000         }
4001
4002         if (need_re_stat) {
4003                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
4004                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
4005                           smb_fname_str_dbg(smb_dname), strerror(errno)));
4006                         return map_nt_error_from_unix(errno);
4007                 }
4008         }
4009
4010         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
4011                      smb_dname->base_name);
4012
4013         return NT_STATUS_OK;
4014 }
4015
4016 /****************************************************************************
4017  Open a directory from an NT SMB call.
4018 ****************************************************************************/
4019
4020 static NTSTATUS open_directory(connection_struct *conn,
4021                                struct smb_request *req,
4022                                struct smb_filename *smb_dname,
4023                                uint32_t access_mask,
4024                                uint32_t share_access,
4025                                uint32_t create_disposition,
4026                                uint32_t create_options,
4027                                uint32_t file_attributes,
4028                                int *pinfo,
4029                                files_struct **result)
4030 {
4031         files_struct *fsp = NULL;
4032         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
4033         struct share_mode_lock *lck = NULL;
4034         NTSTATUS status;
4035         struct timespec mtimespec;
4036         int info = 0;
4037         bool ok;
4038
4039         if (is_ntfs_stream_smb_fname(smb_dname)) {
4040                 DEBUG(2, ("open_directory: %s is a stream name!\n",
4041                           smb_fname_str_dbg(smb_dname)));
4042                 return NT_STATUS_NOT_A_DIRECTORY;
4043         }
4044
4045         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
4046                 /* Ensure we have a directory attribute. */
4047                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
4048         }
4049
4050         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
4051                  "share_access = 0x%x create_options = 0x%x, "
4052                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
4053                  smb_fname_str_dbg(smb_dname),
4054                  (unsigned int)access_mask,
4055                  (unsigned int)share_access,
4056                  (unsigned int)create_options,
4057                  (unsigned int)create_disposition,
4058                  (unsigned int)file_attributes));
4059
4060         status = smbd_calculate_access_mask(conn, smb_dname, false,
4061                                             access_mask, &access_mask);
4062         if (!NT_STATUS_IS_OK(status)) {
4063                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
4064                         "on file %s returned %s\n",
4065                         smb_fname_str_dbg(smb_dname),
4066                         nt_errstr(status)));
4067                 return status;
4068         }
4069
4070         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4071                         !security_token_has_privilege(get_current_nttok(conn),
4072                                         SEC_PRIV_SECURITY)) {
4073                 DEBUG(10, ("open_directory: open on %s "
4074                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4075                         smb_fname_str_dbg(smb_dname)));
4076                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4077         }
4078
4079         switch( create_disposition ) {
4080                 case FILE_OPEN:
4081
4082                         if (!dir_existed) {
4083                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4084                         }
4085
4086                         info = FILE_WAS_OPENED;
4087                         break;
4088
4089                 case FILE_CREATE:
4090
4091                         /* If directory exists error. If directory doesn't
4092                          * exist create. */
4093
4094                         if (dir_existed) {
4095                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4096                                 DEBUG(2, ("open_directory: unable to create "
4097                                           "%s. Error was %s\n",
4098                                           smb_fname_str_dbg(smb_dname),
4099                                           nt_errstr(status)));
4100                                 return status;
4101                         }
4102
4103                         status = mkdir_internal(conn, smb_dname,
4104                                                 file_attributes);
4105
4106                         if (!NT_STATUS_IS_OK(status)) {
4107                                 DEBUG(2, ("open_directory: unable to create "
4108                                           "%s. Error was %s\n",
4109                                           smb_fname_str_dbg(smb_dname),
4110                                           nt_errstr(status)));
4111                                 return status;
4112                         }
4113
4114                         info = FILE_WAS_CREATED;
4115                         break;
4116
4117                 case FILE_OPEN_IF:
4118                         /*
4119                          * If directory exists open. If directory doesn't
4120                          * exist create.
4121                          */
4122
4123                         if (dir_existed) {
4124                                 status = NT_STATUS_OK;
4125                                 info = FILE_WAS_OPENED;
4126                         } else {
4127                                 status = mkdir_internal(conn, smb_dname,
4128                                                 file_attributes);
4129
4130                                 if (NT_STATUS_IS_OK(status)) {
4131                                         info = FILE_WAS_CREATED;
4132                                 } else {
4133                                         /* Cope with create race. */
4134                                         if (!NT_STATUS_EQUAL(status,
4135                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4136                                                 DEBUG(2, ("open_directory: unable to create "
4137                                                         "%s. Error was %s\n",
4138                                                         smb_fname_str_dbg(smb_dname),
4139                                                         nt_errstr(status)));
4140                                                 return status;
4141                                         }
4142
4143                                         /*
4144                                          * If mkdir_internal() returned
4145                                          * NT_STATUS_OBJECT_NAME_COLLISION
4146                                          * we still must lstat the path.
4147                                          */
4148
4149                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4150                                                         == -1) {
4151                                                 DEBUG(2, ("Could not stat "
4152                                                         "directory '%s' just "
4153                                                         "opened: %s\n",
4154                                                         smb_fname_str_dbg(
4155                                                                 smb_dname),
4156                                                         strerror(errno)));
4157                                                 return map_nt_error_from_unix(
4158                                                                 errno);
4159                                         }
4160
4161                                         info = FILE_WAS_OPENED;
4162                                 }
4163                         }
4164
4165                         break;
4166
4167                 case FILE_SUPERSEDE:
4168                 case FILE_OVERWRITE:
4169                 case FILE_OVERWRITE_IF:
4170                 default:
4171                         DEBUG(5,("open_directory: invalid create_disposition "
4172                                  "0x%x for directory %s\n",
4173                                  (unsigned int)create_disposition,
4174                                  smb_fname_str_dbg(smb_dname)));
4175                         return NT_STATUS_INVALID_PARAMETER;
4176         }
4177
4178         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4179                 DEBUG(5,("open_directory: %s is not a directory !\n",
4180                          smb_fname_str_dbg(smb_dname)));
4181                 return NT_STATUS_NOT_A_DIRECTORY;
4182         }
4183
4184         if (info == FILE_WAS_OPENED) {
4185                 status = smbd_check_access_rights(conn,
4186                                                 smb_dname,
4187                                                 false,
4188                                                 access_mask);
4189                 if (!NT_STATUS_IS_OK(status)) {
4190                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4191                                 "file %s failed with %s\n",
4192                                 smb_fname_str_dbg(smb_dname),
4193                                 nt_errstr(status)));
4194                         return status;
4195                 }
4196         }
4197
4198         status = file_new(req, conn, &fsp);
4199         if(!NT_STATUS_IS_OK(status)) {
4200                 return status;
4201         }
4202
4203         /*
4204          * Setup the files_struct for it.
4205          */
4206
4207         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4208         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4209         fsp->file_pid = req ? req->smbpid : 0;
4210         fsp->can_lock = False;
4211         fsp->can_read = False;
4212         fsp->can_write = False;
4213
4214         fsp->share_access = share_access;
4215         fsp->fh->private_options = 0;
4216         /*
4217          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4218          */
4219         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4220         fsp->print_file = NULL;
4221         fsp->modified = False;
4222         fsp->oplock_type = NO_OPLOCK;
4223         fsp->sent_oplock_break = NO_BREAK_SENT;
4224         fsp->is_directory = True;
4225         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4226                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4227         }
4228         status = fsp_set_smb_fname(fsp, smb_dname);
4229         if (!NT_STATUS_IS_OK(status)) {
4230                 file_free(req, fsp);
4231                 return status;
4232         }
4233
4234         /* Don't store old timestamps for directory
4235            handles in the internal database. We don't
4236            update them in there if new objects
4237            are creaded in the directory. Currently
4238            we only update timestamps on file writes.
4239            See bug #9870.
4240         */
4241         ZERO_STRUCT(mtimespec);
4242
4243         if (access_mask & (FILE_LIST_DIRECTORY|
4244                            FILE_ADD_FILE|
4245                            FILE_ADD_SUBDIRECTORY|
4246                            FILE_TRAVERSE|
4247                            DELETE_ACCESS|
4248                            FILE_DELETE_CHILD)) {
4249 #ifdef O_DIRECTORY
4250                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4251 #else
4252                 /* POSIX allows us to open a directory with O_RDONLY. */
4253                 status = fd_open(conn, fsp, O_RDONLY, 0);
4254 #endif
4255                 if (!NT_STATUS_IS_OK(status)) {
4256                         DEBUG(5, ("open_directory: Could not open fd for "
4257                                 "%s (%s)\n",
4258                                 smb_fname_str_dbg(smb_dname),
4259                                 nt_errstr(status)));
4260                         file_free(req, fsp);
4261                         return status;
4262                 }
4263         } else {
4264                 fsp->fh->fd = -1;
4265                 DEBUG(10, ("Not opening Directory %s\n",
4266                         smb_fname_str_dbg(smb_dname)));
4267         }
4268
4269         status = vfs_stat_fsp(fsp);
4270         if (!NT_STATUS_IS_OK(status)) {
4271                 fd_close(fsp);
4272                 file_free(req, fsp);
4273                 return status;
4274         }
4275
4276         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4277                 DEBUG(5,("open_directory: %s is not a directory !\n",
4278                          smb_fname_str_dbg(smb_dname)));
4279                 fd_close(fsp);
4280                 file_free(req, fsp);
4281                 return NT_STATUS_NOT_A_DIRECTORY;
4282         }
4283
4284         /* Ensure there was no race condition.  We need to check
4285          * dev/inode but not permissions, as these can change
4286          * legitimately */
4287         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4288                 DEBUG(5,("open_directory: stat struct differs for "
4289                         "directory %s.\n",
4290                         smb_fname_str_dbg(smb_dname)));
4291                 fd_close(fsp);
4292                 file_free(req, fsp);
4293                 return NT_STATUS_ACCESS_DENIED;
4294         }
4295
4296         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4297                                   conn->connectpath, smb_dname,
4298                                   &mtimespec);
4299
4300         if (lck == NULL) {
4301                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4302                           "%s\n", smb_fname_str_dbg(smb_dname)));
4303                 fd_close(fsp);
4304                 file_free(req, fsp);
4305                 return NT_STATUS_SHARING_VIOLATION;
4306         }
4307
4308         if (has_delete_on_close(lck, fsp->name_hash)) {
4309                 TALLOC_FREE(lck);
4310                 fd_close(fsp);
4311                 file_free(req, fsp);
4312                 return NT_STATUS_DELETE_PENDING;
4313         }
4314
4315         status = open_mode_check(conn, lck,
4316                                  access_mask, share_access);
4317
4318         if (!NT_STATUS_IS_OK(status)) {
4319                 TALLOC_FREE(lck);
4320                 fd_close(fsp);
4321                 file_free(req, fsp);
4322                 return status;
4323         }
4324
4325         ok = set_share_mode(
4326                 lck,
4327                 fsp,
4328                 get_current_uid(conn),
4329                 req ? req->mid : 0,
4330                 NO_OPLOCK,
4331                 NULL,
4332                 NULL);
4333         if (!ok) {
4334                 TALLOC_FREE(lck);
4335                 fd_close(fsp);
4336                 file_free(req, fsp);
4337                 return NT_STATUS_NO_MEMORY;
4338         }
4339
4340         /* For directories the delete on close bit at open time seems
4341            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4342         if (create_options & FILE_DELETE_ON_CLOSE) {
4343                 status = can_set_delete_on_close(fsp, 0);
4344                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4345                         del_share_mode(lck, fsp);
4346                         TALLOC_FREE(lck);
4347                         fd_close(fsp);
4348                         file_free(req, fsp);
4349                         return status;
4350                 }
4351
4352                 if (NT_STATUS_IS_OK(status)) {
4353                         /* Note that here we set the *initial* delete on close flag,
4354                            not the regular one. The magic gets handled in close. */
4355                         fsp->initial_delete_on_close = True;
4356                 }
4357         }
4358
4359         {
4360                 /*
4361                  * Deal with other opens having a modified write time. Is this
4362                  * possible for directories?
4363                  */
4364                 struct timespec write_time = get_share_mode_write_time(lck);
4365
4366                 if (!null_timespec(write_time)) {
4367                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4368                 }
4369         }
4370
4371         TALLOC_FREE(lck);
4372
4373         if (pinfo) {
4374                 *pinfo = info;
4375         }
4376
4377         *result = fsp;
4378         return NT_STATUS_OK;
4379 }
4380
4381 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4382                           struct smb_filename *smb_dname)
4383 {
4384         NTSTATUS status;
4385         files_struct *fsp;
4386
4387         status = SMB_VFS_CREATE_FILE(
4388                 conn,                                   /* conn */
4389                 req,                                    /* req */
4390                 0,                                      /* root_dir_fid */
4391                 smb_dname,                              /* fname */
4392                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4393                 FILE_SHARE_NONE,                        /* share_access */
4394                 FILE_CREATE,                            /* create_disposition*/
4395                 FILE_DIRECTORY_FILE,                    /* create_options */
4396                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4397                 0,                                      /* oplock_request */
4398                 NULL,                                   /* lease */
4399                 0,                                      /* allocation_size */
4400                 0,                                      /* private_flags */
4401                 NULL,                                   /* sd */
4402                 NULL,                                   /* ea_list */
4403                 &fsp,                                   /* result */
4404                 NULL,                                   /* pinfo */
4405                 NULL, NULL);                            /* create context */
4406
4407         if (NT_STATUS_IS_OK(status)) {
4408                 close_file(req, fsp, NORMAL_CLOSE);
4409         }
4410
4411         return status;
4412 }
4413
4414 /****************************************************************************
4415  Receive notification that one of our open files has been renamed by another
4416  smbd process.
4417 ****************************************************************************/
4418
4419 void msg_file_was_renamed(struct messaging_context *msg_ctx,
4420                           void *private_data,
4421                           uint32_t msg_type,
4422                           struct server_id src,
4423                           DATA_BLOB *data)
4424 {
4425         struct file_rename_message *msg = NULL;
4426         enum ndr_err_code ndr_err;
4427         files_struct *fsp;
4428         struct smb_filename *smb_fname = NULL;
4429         struct smbd_server_connection *sconn =
4430                 talloc_get_type_abort(private_data,
4431                 struct smbd_server_connection);
4432
4433         msg = talloc(talloc_tos(), struct file_rename_message);
4434         if (msg == NULL) {
4435                 DBG_WARNING("talloc failed\n");
4436                 return;
4437         }
4438
4439         ndr_err = ndr_pull_struct_blob_all(
4440                 data,
4441                 msg,
4442                 msg,
4443                 (ndr_pull_flags_fn_t)ndr_pull_file_rename_message);
4444         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
4445                 DBG_DEBUG("ndr_pull_oplock_break_message failed: %s\n",
4446                           ndr_errstr(ndr_err));
4447                 goto out;
4448         }
4449         if (DEBUGLEVEL >= 10) {
4450                 struct server_id_buf buf;
4451                 DBG_DEBUG("Got rename message from %s\n",
4452                           server_id_str_buf(src, &buf));
4453                 NDR_PRINT_DEBUG(file_rename_message, msg);
4454         }
4455
4456         /* stream_name must always be NULL if there is no stream. */
4457         if ((msg->stream_name != NULL) && (msg->stream_name[0] == '\0')) {
4458                 msg->stream_name = NULL;
4459         }
4460
4461         smb_fname = synthetic_smb_fname(
4462                 msg, msg->base_name, msg->stream_name, NULL, 0);
4463         if (smb_fname == NULL) {
4464                 DBG_DEBUG("synthetic_smb_fname failed\n");
4465                 goto out;
4466         }
4467
4468         fsp = file_find_dif(sconn, msg->id, msg->share_file_id);
4469         if (fsp == NULL) {
4470                 DBG_DEBUG("fsp not found\n");
4471                 goto out;
4472         }
4473
4474         if (strcmp(fsp->conn->connectpath, msg->servicepath) == 0) {
4475                 NTSTATUS status;
4476                 DBG_DEBUG("renaming file %s from %s -> %s\n",
4477                           fsp_fnum_dbg(fsp),
4478                           fsp_str_dbg(fsp),
4479                           smb_fname_str_dbg(smb_fname));
4480                 status = fsp_set_smb_fname(fsp, smb_fname);
4481                 if (!NT_STATUS_IS_OK(status)) {
4482                         DBG_DEBUG("fsp_set_smb_fname failed: %s\n",
4483                                   nt_errstr(status));
4484                 }
4485         } else {
4486                 /* TODO. JRA. */
4487                 /*
4488                  * Now we have the complete path we can work out if
4489                  * this is actually within this share and adjust
4490                  * newname accordingly.
4491                  */
4492                 DBG_DEBUG("share mismatch (sharepath %s not sharepath %s) "
4493                           "%s from %s -> %s\n",
4494                           fsp->conn->connectpath,
4495                           msg->servicepath,
4496                           fsp_fnum_dbg(fsp),
4497                           fsp_str_dbg(fsp),
4498                           smb_fname_str_dbg(smb_fname));
4499         }
4500  out:
4501         TALLOC_FREE(msg);
4502 }
4503
4504 /*
4505  * If a main file is opened for delete, all streams need to be checked for
4506  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4507  * If that works, delete them all by setting the delete on close and close.
4508  */
4509
4510 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4511                                         const struct smb_filename *smb_fname)
4512 {
4513         struct stream_struct *stream_info = NULL;
4514         files_struct **streams = NULL;
4515         int i;
4516         unsigned int num_streams = 0;
4517         TALLOC_CTX *frame = talloc_stackframe();
4518         NTSTATUS status;
4519
4520         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4521                                 &num_streams, &stream_info);
4522
4523         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4524             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4525                 DEBUG(10, ("no streams around\n"));
4526                 TALLOC_FREE(frame);
4527                 return NT_STATUS_OK;
4528         }
4529
4530         if (!NT_STATUS_IS_OK(status)) {
4531                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4532                            nt_errstr(status)));
4533                 goto fail;
4534         }
4535
4536         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4537                    num_streams));
4538
4539         if (num_streams == 0) {
4540                 TALLOC_FREE(frame);
4541                 return NT_STATUS_OK;
4542         }
4543
4544         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4545         if (streams == NULL) {
4546                 DEBUG(0, ("talloc failed\n"));
4547                 status = NT_STATUS_NO_MEMORY;
4548                 goto fail;
4549         }
4550
4551         for (i=0; i<num_streams; i++) {
4552                 struct smb_filename *smb_fname_cp;
4553
4554                 if (strequal(stream_info[i].name, "::$DATA")) {
4555                         streams[i] = NULL;
4556                         continue;
4557                 }
4558
4559                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4560                                         smb_fname->base_name,
4561                                         stream_info[i].name,
4562                                         NULL,
4563                                         (smb_fname->flags &
4564                                                 ~SMB_FILENAME_POSIX_PATH));
4565                 if (smb_fname_cp == NULL) {
4566                         status = NT_STATUS_NO_MEMORY;
4567                         goto fail;
4568                 }
4569
4570                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4571                         DEBUG(10, ("Unable to stat stream: %s\n",
4572                                    smb_fname_str_dbg(smb_fname_cp)));
4573                 }
4574
4575                 status = SMB_VFS_CREATE_FILE(
4576                          conn,                  /* conn */
4577                          NULL,                  /* req */
4578                          0,                     /* root_dir_fid */
4579                          smb_fname_cp,          /* fname */
4580                          DELETE_ACCESS,         /* access_mask */
4581                          (FILE_SHARE_READ |     /* share_access */
4582                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4583                          FILE_OPEN,             /* create_disposition*/
4584                          0,                     /* create_options */
4585                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4586                          0,                     /* oplock_request */
4587                          NULL,                  /* lease */
4588                          0,                     /* allocation_size */
4589                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4590                          NULL,                  /* sd */
4591                          NULL,                  /* ea_list */
4592                          &streams[i],           /* result */
4593                          NULL,                  /* pinfo */
4594                          NULL, NULL);           /* create context */
4595
4596                 if (!NT_STATUS_IS_OK(status)) {
4597                         DEBUG(10, ("Could not open stream %s: %s\n",
4598                                    smb_fname_str_dbg(smb_fname_cp),
4599                                    nt_errstr(status)));
4600
4601                         TALLOC_FREE(smb_fname_cp);
4602                         break;
4603                 }
4604                 TALLOC_FREE(smb_fname_cp);
4605         }
4606
4607         /*
4608          * don't touch the variable "status" beyond this point :-)
4609          */
4610
4611         for (i -= 1 ; i >= 0; i--) {
4612                 if (streams[i] == NULL) {
4613                         continue;
4614                 }
4615
4616                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4617                            fsp_str_dbg(streams[i])));
4618                 close_file(NULL, streams[i], NORMAL_CLOSE);
4619         }
4620
4621  fail:
4622         TALLOC_FREE(frame);
4623         return status;
4624 }
4625
4626 /*********************************************************************
4627  Create a default ACL by inheriting from the parent. If no inheritance
4628  from the parent available, don't set anything. This will leave the actual
4629  permissions the new file or directory already got from the filesystem
4630  as the NT ACL when read.
4631 *********************************************************************/
4632
4633 static NTSTATUS inherit_new_acl(files_struct *fsp)
4634 {
4635         TALLOC_CTX *frame = talloc_stackframe();
4636         char *parent_name = NULL;
4637         struct security_descriptor *parent_desc = NULL;
4638         NTSTATUS status = NT_STATUS_OK;
4639         struct security_descriptor *psd = NULL;
4640         const struct dom_sid *owner_sid = NULL;
4641         const struct dom_sid *group_sid = NULL;
4642         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4643         struct security_token *token = fsp->conn->session_info->security_token;
4644         bool inherit_owner =
4645             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4646         bool inheritable_components = false;
4647         bool try_builtin_administrators = false;
4648         const struct dom_sid *BA_U_sid = NULL;
4649         const struct dom_sid *BA_G_sid = NULL;
4650         bool try_system = false;
4651         const struct dom_sid *SY_U_sid = NULL;
4652         const struct dom_sid *SY_G_sid = NULL;
4653         size_t size = 0;
4654         struct smb_filename *parent_smb_fname = NULL;
4655
4656         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4657                 TALLOC_FREE(frame);
4658                 return NT_STATUS_NO_MEMORY;
4659         }
4660         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4661                                                 parent_name,
4662                                                 NULL,
4663                                                 NULL,
4664                                                 fsp->fsp_name->flags);
4665
4666         if (parent_smb_fname == NULL) {
4667                 TALLOC_FREE(frame);
4668                 return NT_STATUS_NO_MEMORY;
4669         }
4670
4671         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4672                                     parent_smb_fname,
4673                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4674                                     frame,
4675                                     &parent_desc);
4676         if (!NT_STATUS_IS_OK(status)) {
4677                 TALLOC_FREE(frame);
4678                 return status;
4679         }
4680
4681         inheritable_components = sd_has_inheritable_components(parent_desc,
4682                                         fsp->is_directory);
4683
4684         if (!inheritable_components && !inherit_owner) {
4685                 TALLOC_FREE(frame);
4686                 /* Nothing to inherit and not setting owner. */
4687                 return NT_STATUS_OK;
4688         }
4689
4690         /* Create an inherited descriptor from the parent. */
4691
4692         if (DEBUGLEVEL >= 10) {
4693                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4694                         fsp_str_dbg(fsp) ));
4695                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4696         }
4697
4698         /* Inherit from parent descriptor if "inherit owner" set. */
4699         if (inherit_owner) {
4700                 owner_sid = parent_desc->owner_sid;
4701                 group_sid = parent_desc->group_sid;
4702         }
4703
4704         if (owner_sid == NULL) {
4705                 if (security_token_has_builtin_administrators(token)) {
4706                         try_builtin_administrators = true;
4707                 } else if (security_token_is_system(token)) {
4708                         try_builtin_administrators = true;
4709                         try_system = true;
4710                 }
4711         }
4712
4713         if (group_sid == NULL &&
4714             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4715         {
4716                 if (security_token_is_system(token)) {
4717                         try_builtin_administrators = true;
4718                         try_system = true;
4719                 }
4720         }
4721
4722         if (try_builtin_administrators) {
4723                 struct unixid ids;
4724                 bool ok;
4725
4726                 ZERO_STRUCT(ids);
4727                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4728                 if (ok) {
4729                         switch (ids.type) {
4730                         case ID_TYPE_BOTH:
4731                                 BA_U_sid = &global_sid_Builtin_Administrators;
4732                                 BA_G_sid = &global_sid_Builtin_Administrators;
4733                                 break;
4734                         case ID_TYPE_UID:
4735                                 BA_U_sid = &global_sid_Builtin_Administrators;
4736                                 break;
4737                         case ID_TYPE_GID:
4738                                 BA_G_sid = &global_sid_Builtin_Administrators;
4739                                 break;
4740                         default:
4741                                 break;
4742                         }
4743                 }
4744         }
4745
4746         if (try_system) {
4747                 struct unixid ids;
4748                 bool ok;
4749
4750                 ZERO_STRUCT(ids);
4751                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4752                 if (ok) {
4753                         switch (ids.type) {
4754                         case ID_TYPE_BOTH:
4755                                 SY_U_sid = &global_sid_System;
4756                                 SY_G_sid = &global_sid_System;
4757                                 break;
4758                         case ID_TYPE_UID:
4759                                 SY_U_sid = &global_sid_System;
4760                                 break;
4761                         case ID_TYPE_GID:
4762                                 SY_G_sid = &global_sid_System;
4763                                 break;
4764                         default:
4765                                 break;
4766                         }
4767                 }
4768         }
4769
4770         if (owner_sid == NULL) {
4771                 owner_sid = BA_U_sid;
4772         }
4773
4774         if (owner_sid == NULL) {
4775                 owner_sid = SY_U_sid;
4776         }
4777
4778         if (group_sid == NULL) {
4779                 group_sid = SY_G_sid;
4780         }
4781
4782         if (try_system && group_sid == NULL) {
4783                 group_sid = BA_G_sid;
4784         }
4785
4786         if (owner_sid == NULL) {
4787                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4788         }
4789         if (group_sid == NULL) {
4790                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4791                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4792                 } else {
4793                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4794                 }
4795         }
4796
4797         status = se_create_child_secdesc(frame,
4798                         &psd,
4799                         &size,
4800                         parent_desc,
4801                         owner_sid,
4802                         group_sid,
4803                         fsp->is_directory);
4804         if (!NT_STATUS_IS_OK(status)) {
4805                 TALLOC_FREE(frame);
4806                 return status;
4807         }
4808
4809         /* If inheritable_components == false,
4810            se_create_child_secdesc()
4811            creates a security descriptor with a NULL dacl
4812            entry, but with SEC_DESC_DACL_PRESENT. We need
4813            to remove that flag. */
4814
4815         if (!inheritable_components) {
4816                 security_info_sent &= ~SECINFO_DACL;
4817                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4818         }
4819
4820         if (DEBUGLEVEL >= 10) {
4821                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4822                         fsp_str_dbg(fsp) ));
4823                 NDR_PRINT_DEBUG(security_descriptor, psd);
4824         }
4825
4826         if (inherit_owner) {
4827                 /* We need to be root to force this. */
4828                 become_root();
4829         }
4830         status = SMB_VFS_FSET_NT_ACL(fsp,
4831                         security_info_sent,
4832                         psd);
4833         if (inherit_owner) {
4834                 unbecome_root();
4835         }
4836         TALLOC_FREE(frame);
4837         return status;
4838 }
4839
4840 /*
4841  * If we already have a lease, it must match the new file id. [MS-SMB2]
4842  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4843  * used for a different file name.
4844  */
4845
4846 struct lease_match_state {
4847         /* Input parameters. */
4848         TALLOC_CTX *mem_ctx;
4849         const char *servicepath;
4850         const struct smb_filename *fname;
4851         bool file_existed;
4852         struct file_id id;
4853         /* Return parameters. */
4854         uint32_t num_file_ids;
4855         struct file_id *ids;
4856         NTSTATUS match_status;
4857 };
4858
4859 /*************************************************************
4860  File doesn't exist but this lease key+guid is already in use.
4861
4862  This is only allowable in the dynamic share case where the
4863  service path must be different.
4864
4865  There is a small race condition here in the multi-connection
4866  case where a client sends two create calls on different connections,
4867  where the file doesn't exist and one smbd creates the leases_db
4868  entry first, but this will get fixed by the multichannel cleanup
4869  when all identical client_guids get handled by a single smbd.
4870 **************************************************************/
4871
4872 static void lease_match_parser_new_file(
4873         uint32_t num_files,
4874         const struct leases_db_file *files,
4875         struct lease_match_state *state)
4876 {
4877         uint32_t i;
4878
4879         for (i = 0; i < num_files; i++) {
4880                 const struct leases_db_file *f = &files[i];
4881                 if (strequal(state->servicepath, f->servicepath)) {
4882                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4883                         return;
4884                 }
4885         }
4886
4887         /* Dynamic share case. Break leases on all other files. */
4888         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4889                                         num_files,
4890                                         files,
4891                                         &state->ids);
4892         if (!NT_STATUS_IS_OK(state->match_status)) {
4893                 return;
4894         }
4895
4896         state->num_file_ids = num_files;
4897         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4898         return;
4899 }
4900
4901 static void lease_match_parser(
4902         uint32_t num_files,
4903         const struct leases_db_file *files,
4904         void *private_data)
4905 {
4906         struct lease_match_state *state =
4907                 (struct lease_match_state *)private_data;
4908         uint32_t i;
4909
4910         if (!state->file_existed) {
4911                 /*
4912                  * Deal with name mismatch or
4913                  * possible dynamic share case separately
4914                  * to make code clearer.
4915                  */
4916                 lease_match_parser_new_file(num_files,
4917                                                 files,
4918                                                 state);
4919                 return;
4920         }
4921
4922         /* File existed. */
4923         state->match_status = NT_STATUS_OK;
4924
4925         for (i = 0; i < num_files; i++) {
4926                 const struct leases_db_file *f = &files[i];
4927
4928                 /* Everything should be the same. */
4929                 if (!file_id_equal(&state->id, &f->id)) {
4930                         /* This should catch all dynamic share cases. */
4931                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4932                         break;
4933                 }
4934                 if (!strequal(f->servicepath, state->servicepath)) {
4935                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4936                         break;
4937                 }
4938                 if (!strequal(f->base_name, state->fname->base_name)) {
4939                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4940                         break;
4941                 }
4942                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4943                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4944                         break;
4945                 }
4946         }
4947
4948         if (NT_STATUS_IS_OK(state->match_status)) {
4949                 /*
4950                  * Common case - just opening another handle on a
4951                  * file on a non-dynamic share.
4952                  */
4953                 return;
4954         }
4955
4956         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4957                 /* Mismatched path. Error back to client. */
4958                 return;
4959         }
4960
4961         /*
4962          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4963          * Don't allow leases.
4964          */
4965
4966         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4967                                         num_files,
4968                                         files,
4969                                         &state->ids);
4970         if (!NT_STATUS_IS_OK(state->match_status)) {
4971                 return;
4972         }
4973
4974         state->num_file_ids = num_files;
4975         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4976         return;
4977 }
4978
4979 static NTSTATUS lease_match(connection_struct *conn,
4980                             struct smb_request *req,
4981                             struct smb2_lease_key *lease_key,
4982                             const char *servicepath,
4983                             const struct smb_filename *fname,
4984                             uint16_t *p_version,
4985                             uint16_t *p_epoch)
4986 {
4987         struct smbd_server_connection *sconn = req->sconn;
4988         TALLOC_CTX *tos = talloc_tos();
4989         struct lease_match_state state = {
4990                 .mem_ctx = tos,
4991                 .servicepath = servicepath,
4992                 .fname = fname,
4993                 .match_status = NT_STATUS_OK
4994         };
4995         uint32_t i;
4996         NTSTATUS status;
4997
4998         state.file_existed = VALID_STAT(fname->st);
4999         if (state.file_existed) {
5000                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
5001         }
5002
5003         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
5004                                  lease_key, lease_match_parser, &state);
5005         if (!NT_STATUS_IS_OK(status)) {
5006                 /*
5007                  * Not found or error means okay: We can make the lease pass
5008                  */
5009                 return NT_STATUS_OK;
5010         }
5011         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5012                 /*
5013                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
5014                  * deal with it.
5015                  */
5016                 return state.match_status;
5017         }
5018
5019         /* We have to break all existing leases. */
5020         for (i = 0; i < state.num_file_ids; i++) {
5021                 struct share_mode_lock *lck;
5022                 struct share_mode_data *d;
5023                 struct share_mode_entry *lease_entry = NULL;
5024                 uint32_t j;
5025
5026                 if (file_id_equal(&state.ids[i], &state.id)) {
5027                         /* Don't need to break our own file. */
5028                         continue;
5029                 }
5030
5031                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
5032                 if (lck == NULL) {
5033                         /* Race condition - file already closed. */
5034                         continue;
5035                 }
5036                 d = lck->data;
5037                 for (j=0; j<d->num_share_modes; j++) {
5038                         struct share_mode_entry *e = &d->share_modes[j];
5039                         uint32_t e_lease_type = get_lease_type(d, e);
5040
5041                         if (share_mode_stale_pid(d, j)) {
5042                                 continue;
5043                         }
5044
5045                         if (e->op_type == LEASE_OPLOCK) {
5046                                 if (!smb2_lease_key_equal(&e->lease_key,
5047                                                           lease_key)) {
5048                                         continue;
5049                                 }
5050                                 lease_entry = e;
5051                         }
5052
5053                         if (e_lease_type == SMB2_LEASE_NONE) {
5054                                 continue;
5055                         }
5056
5057                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
5058                                            SMB2_LEASE_NONE);
5059
5060                         /*
5061                          * Windows 7 and 8 lease clients
5062                          * are broken in that they will not
5063                          * respond to lease break requests
5064                          * whilst waiting for an outstanding
5065                          * open request on that lease handle
5066                          * on the same TCP connection, due
5067                          * to holding an internal inode lock.
5068                          *
5069                          * This means we can't reschedule
5070                          * ourselves here, but must return
5071                          * from the create.
5072                          *
5073                          * Work around:
5074                          *
5075                          * Send the breaks and then return
5076                          * SMB2_LEASE_NONE in the lease handle
5077                          * to cause them to acknowledge the
5078                          * lease break. Consultation with
5079                          * Microsoft engineering confirmed
5080                          * this approach is safe.
5081                          */
5082
5083                 }
5084
5085                 if (lease_entry != NULL) {
5086                         status = leases_db_get(
5087                                 &lease_entry->client_guid,
5088                                 &lease_entry->lease_key,
5089                                 &d->id,
5090                                 NULL, /* current_state */
5091                                 NULL, /* breaking */
5092                                 NULL, /* breaking_to_requested */
5093                                 NULL, /* breaking_to_required */
5094                                 p_version, /* lease_version */
5095                                 p_epoch); /* epoch */
5096                         if (!NT_STATUS_IS_OK(status)) {
5097                                 DBG_WARNING("Could not find version/epoch: "
5098                                             "%s\n",
5099                                             nt_errstr(status));
5100                         }
5101                 }
5102
5103                 TALLOC_FREE(lck);
5104         }
5105         /*
5106          * Ensure we don't grant anything more so we
5107          * never upgrade.
5108          */
5109         return NT_STATUS_OPLOCK_NOT_GRANTED;
5110 }
5111
5112 /*
5113  * Wrapper around open_file_ntcreate and open_directory
5114  */
5115
5116 static NTSTATUS create_file_unixpath(connection_struct *conn,
5117                                      struct smb_request *req,
5118                                      struct smb_filename *smb_fname,
5119                                      uint32_t access_mask,
5120                                      uint32_t share_access,
5121                                      uint32_t create_disposition,
5122                                      uint32_t create_options,
5123                                      uint32_t file_attributes,
5124                                      uint32_t oplock_request,
5125                                      struct smb2_lease *lease,
5126                                      uint64_t allocation_size,
5127                                      uint32_t private_flags,
5128                                      struct security_descriptor *sd,
5129                                      struct ea_list *ea_list,
5130
5131                                      files_struct **result,
5132                                      int *pinfo)
5133 {
5134         int info = FILE_WAS_OPENED;
5135         files_struct *base_fsp = NULL;
5136         files_struct *fsp = NULL;
5137         NTSTATUS status;
5138
5139         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5140                   "file_attributes = 0x%x, share_access = 0x%x, "
5141                   "create_disposition = 0x%x create_options = 0x%x "
5142                   "oplock_request = 0x%x private_flags = 0x%x "
5143                   "ea_list = %p, sd = %p, "
5144                   "fname = %s\n",
5145                   (unsigned int)access_mask,
5146                   (unsigned int)file_attributes,
5147                   (unsigned int)share_access,
5148                   (unsigned int)create_disposition,
5149                   (unsigned int)create_options,
5150                   (unsigned int)oplock_request,
5151                   (unsigned int)private_flags,
5152                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5153
5154         if (create_options & FILE_OPEN_BY_FILE_ID) {
5155                 status = NT_STATUS_NOT_SUPPORTED;
5156                 goto fail;
5157         }
5158
5159         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5160                 status = NT_STATUS_INVALID_PARAMETER;
5161                 goto fail;
5162         }
5163
5164         if (req == NULL) {
5165                 oplock_request |= INTERNAL_OPEN_ONLY;
5166         }
5167
5168         if (lease != NULL) {
5169                 uint16_t epoch = lease->lease_epoch;
5170                 uint16_t version = lease->lease_version;
5171
5172                 if (req == NULL) {
5173                         DBG_WARNING("Got lease on internal open\n");
5174                         status = NT_STATUS_INTERNAL_ERROR;
5175                         goto fail;
5176                 }
5177
5178                 status = lease_match(conn,
5179                                 req,
5180                                 &lease->lease_key,
5181                                 conn->connectpath,
5182                                 smb_fname,
5183                                 &version,
5184                                 &epoch);
5185                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5186                         /* Dynamic share file. No leases and update epoch... */
5187                         lease->lease_state = SMB2_LEASE_NONE;
5188                         lease->lease_epoch = epoch;
5189                         lease->lease_version = version;
5190                 } else if (!NT_STATUS_IS_OK(status)) {
5191                         goto fail;
5192                 }
5193         }
5194
5195         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5196             && (access_mask & DELETE_ACCESS)
5197             && !is_ntfs_stream_smb_fname(smb_fname)) {
5198                 /*
5199                  * We can't open a file with DELETE access if any of the
5200                  * streams is open without FILE_SHARE_DELETE
5201                  */
5202                 status = open_streams_for_delete(conn, smb_fname);
5203
5204                 if (!NT_STATUS_IS_OK(status)) {
5205                         goto fail;
5206                 }
5207         }
5208
5209         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5210                         !security_token_has_privilege(get_current_nttok(conn),
5211                                         SEC_PRIV_SECURITY)) {
5212                 DEBUG(10, ("create_file_unixpath: open on %s "
5213                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5214                         smb_fname_str_dbg(smb_fname)));
5215                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5216                 goto fail;
5217         }
5218
5219         /*
5220          * Files or directories can't be opened DELETE_ON_CLOSE without
5221          * delete access.
5222          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5223          */
5224         if (create_options & FILE_DELETE_ON_CLOSE) {
5225                 if ((access_mask & DELETE_ACCESS) == 0) {
5226                         status = NT_STATUS_INVALID_PARAMETER;
5227                         goto fail;
5228                 }
5229         }
5230
5231         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5232             && is_ntfs_stream_smb_fname(smb_fname)
5233             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5234                 uint32_t base_create_disposition;
5235                 struct smb_filename *smb_fname_base = NULL;
5236                 uint32_t base_privflags;
5237
5238                 if (create_options & FILE_DIRECTORY_FILE) {
5239                         status = NT_STATUS_NOT_A_DIRECTORY;
5240                         goto fail;
5241                 }
5242
5243                 switch (create_disposition) {
5244                 case FILE_OPEN:
5245                         base_create_disposition = FILE_OPEN;
5246                         break;
5247                 default:
5248                         base_create_disposition = FILE_OPEN_IF;
5249                         break;
5250                 }
5251
5252                 /* Create an smb_filename with stream_name == NULL. */
5253                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5254                                                 smb_fname->base_name,
5255                                                 NULL,
5256                                                 NULL,
5257                                                 smb_fname->flags);
5258                 if (smb_fname_base == NULL) {
5259                         status = NT_STATUS_NO_MEMORY;
5260                         goto fail;
5261                 }
5262
5263                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5264                         DEBUG(10, ("Unable to stat stream: %s\n",
5265                                    smb_fname_str_dbg(smb_fname_base)));
5266                 } else {
5267                         /*
5268                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5269                          * We need to check if the requested access mask
5270                          * could be used to open the underlying file (if
5271                          * it existed), as we're passing in zero for the
5272                          * access mask to the base filename.
5273                          */
5274                         status = check_base_file_access(conn,
5275                                                         smb_fname_base,
5276                                                         access_mask);
5277
5278                         if (!NT_STATUS_IS_OK(status)) {
5279                                 DEBUG(10, ("Permission check "
5280                                         "for base %s failed: "
5281                                         "%s\n", smb_fname->base_name,
5282                                         nt_errstr(status)));
5283                                 goto fail;
5284                         }
5285                 }
5286
5287                 base_privflags = NTCREATEX_OPTIONS_PRIVATE_STREAM_BASEOPEN;
5288
5289                 /* Open the base file. */
5290                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5291                                               FILE_SHARE_READ
5292                                               | FILE_SHARE_WRITE
5293                                               | FILE_SHARE_DELETE,
5294                                               base_create_disposition,
5295                                               0, 0, 0, NULL, 0,
5296                                               base_privflags,
5297                                               NULL, NULL,
5298                                               &base_fsp, NULL);
5299                 TALLOC_FREE(smb_fname_base);
5300
5301                 if (!NT_STATUS_IS_OK(status)) {
5302                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5303                                    "%s\n", smb_fname->base_name,
5304                                    nt_errstr(status)));
5305                         goto fail;
5306                 }
5307                 /* we don't need the low level fd */
5308                 fd_close(base_fsp);
5309         }
5310
5311         /*
5312          * If it's a request for a directory open, deal with it separately.
5313          */
5314
5315         if (create_options & FILE_DIRECTORY_FILE) {
5316
5317                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5318                         status = NT_STATUS_INVALID_PARAMETER;
5319                         goto fail;
5320                 }
5321
5322                 /* Can't open a temp directory. IFS kit test. */
5323                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5324                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5325                         status = NT_STATUS_INVALID_PARAMETER;
5326                         goto fail;
5327                 }
5328
5329                 /*
5330                  * We will get a create directory here if the Win32
5331                  * app specified a security descriptor in the
5332                  * CreateDirectory() call.
5333                  */
5334
5335                 oplock_request = 0;
5336                 status = open_directory(
5337                         conn, req, smb_fname, access_mask, share_access,
5338                         create_disposition, create_options, file_attributes,
5339                         &info, &fsp);
5340         } else {
5341
5342                 /*
5343                  * Ordinary file case.
5344                  */
5345
5346                 status = file_new(req, conn, &fsp);
5347                 if(!NT_STATUS_IS_OK(status)) {
5348                         goto fail;
5349                 }
5350
5351                 status = fsp_set_smb_fname(fsp, smb_fname);
5352                 if (!NT_STATUS_IS_OK(status)) {
5353                         goto fail;
5354                 }
5355
5356                 if (base_fsp) {
5357                         /*
5358                          * We're opening the stream element of a
5359                          * base_fsp we already opened. Set up the
5360                          * base_fsp pointer.
5361                          */
5362                         fsp->base_fsp = base_fsp;
5363                 }
5364
5365                 if (allocation_size) {
5366                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5367                                                         allocation_size);
5368                 }
5369
5370                 status = open_file_ntcreate(conn,
5371                                             req,
5372                                             access_mask,
5373                                             share_access,
5374                                             create_disposition,
5375                                             create_options,
5376                                             file_attributes,
5377                                             oplock_request,
5378                                             lease,
5379                                             private_flags,
5380                                             &info,
5381                                             fsp);
5382
5383                 if(!NT_STATUS_IS_OK(status)) {
5384                         file_free(req, fsp);
5385                         fsp = NULL;
5386                 }
5387
5388                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5389
5390                         /* A stream open never opens a directory */
5391
5392                         if (base_fsp) {
5393                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5394                                 goto fail;
5395                         }
5396
5397                         /*
5398                          * Fail the open if it was explicitly a non-directory
5399                          * file.
5400                          */
5401
5402                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5403                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5404                                 goto fail;
5405                         }
5406
5407                         oplock_request = 0;
5408                         status = open_directory(
5409                                 conn, req, smb_fname, access_mask,
5410                                 share_access, create_disposition,
5411                                 create_options, file_attributes,
5412                                 &info, &fsp);
5413                 }
5414         }
5415
5416         if (!NT_STATUS_IS_OK(status)) {
5417                 goto fail;
5418         }
5419
5420         fsp->base_fsp = base_fsp;
5421
5422         if ((ea_list != NULL) &&
5423             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5424                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5425                 if (!NT_STATUS_IS_OK(status)) {
5426                         goto fail;
5427                 }
5428         }
5429
5430         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5431                 status = NT_STATUS_ACCESS_DENIED;
5432                 goto fail;
5433         }
5434
5435         /* Save the requested allocation size. */
5436         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5437                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5438                     && !(fsp->is_directory))
5439                 {
5440                         fsp->initial_allocation_size = smb_roundup(
5441                                 fsp->conn, allocation_size);
5442                         if (vfs_allocate_file_space(
5443                                     fsp, fsp->initial_allocation_size) == -1) {
5444                                 status = NT_STATUS_DISK_FULL;
5445                                 goto fail;
5446                         }
5447                 } else {
5448                         fsp->initial_allocation_size = smb_roundup(
5449                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5450                 }
5451         } else {
5452                 fsp->initial_allocation_size = 0;
5453         }
5454
5455         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5456                                 fsp->base_fsp == NULL) {
5457                 if (sd != NULL) {
5458                         /*
5459                          * According to the MS documentation, the only time the security
5460                          * descriptor is applied to the opened file is iff we *created* the
5461                          * file; an existing file stays the same.
5462                          *
5463                          * Also, it seems (from observation) that you can open the file with
5464                          * any access mask but you can still write the sd. We need to override
5465                          * the granted access before we call set_sd
5466                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5467                          */
5468
5469                         uint32_t sec_info_sent;
5470                         uint32_t saved_access_mask = fsp->access_mask;
5471
5472                         sec_info_sent = get_sec_info(sd);
5473
5474                         fsp->access_mask = FILE_GENERIC_ALL;
5475
5476                         if (sec_info_sent & (SECINFO_OWNER|
5477                                                 SECINFO_GROUP|
5478                                                 SECINFO_DACL|
5479                                                 SECINFO_SACL)) {
5480                                 status = set_sd(fsp, sd, sec_info_sent);
5481                         }
5482
5483                         fsp->access_mask = saved_access_mask;
5484
5485                         if (!NT_STATUS_IS_OK(status)) {
5486                                 goto fail;
5487                         }
5488                 } else if (lp_inherit_acls(SNUM(conn))) {
5489                         /* Inherit from parent. Errors here are not fatal. */
5490                         status = inherit_new_acl(fsp);
5491                         if (!NT_STATUS_IS_OK(status)) {
5492                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5493                                         fsp_str_dbg(fsp),
5494                                         nt_errstr(status) ));
5495                         }
5496                 }
5497         }
5498
5499         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5500          && (create_options & FILE_NO_COMPRESSION)
5501          && (info == FILE_WAS_CREATED)) {
5502                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5503                                                  COMPRESSION_FORMAT_NONE);
5504                 if (!NT_STATUS_IS_OK(status)) {
5505                         DEBUG(1, ("failed to disable compression: %s\n",
5506                                   nt_errstr(status)));
5507                 }
5508         }
5509
5510         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5511
5512         *result = fsp;
5513         if (pinfo != NULL) {
5514                 *pinfo = info;
5515         }
5516
5517         smb_fname->st = fsp->fsp_name->st;
5518
5519         return NT_STATUS_OK;
5520
5521  fail:
5522         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5523
5524         if (fsp != NULL) {
5525                 if (base_fsp && fsp->base_fsp == base_fsp) {
5526                         /*
5527                          * The close_file below will close
5528                          * fsp->base_fsp.
5529                          */
5530                         base_fsp = NULL;
5531                 }
5532                 close_file(req, fsp, ERROR_CLOSE);
5533                 fsp = NULL;
5534         }
5535         if (base_fsp != NULL) {
5536                 close_file(req, base_fsp, ERROR_CLOSE);
5537                 base_fsp = NULL;
5538         }
5539         return status;
5540 }
5541
5542 /*
5543  * Calculate the full path name given a relative fid.
5544  */
5545 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5546                                    struct smb_request *req,
5547                                    uint16_t root_dir_fid,
5548                                    const struct smb_filename *smb_fname,
5549                                    struct smb_filename **smb_fname_out)
5550 {
5551         files_struct *dir_fsp;
5552         char *parent_fname = NULL;
5553         char *new_base_name = NULL;
5554         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5555         NTSTATUS status;
5556
5557         if (root_dir_fid == 0 || !smb_fname) {
5558                 status = NT_STATUS_INTERNAL_ERROR;
5559                 goto out;
5560         }
5561
5562         dir_fsp = file_fsp(req, root_dir_fid);
5563
5564         if (dir_fsp == NULL) {
5565                 status = NT_STATUS_INVALID_HANDLE;
5566                 goto out;
5567         }
5568
5569         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5570                 status = NT_STATUS_INVALID_HANDLE;
5571                 goto out;
5572         }
5573
5574         if (!dir_fsp->is_directory) {
5575
5576                 /*
5577                  * Check to see if this is a mac fork of some kind.
5578                  */
5579
5580                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5581                     is_ntfs_stream_smb_fname(smb_fname)) {
5582                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5583                         goto out;
5584                 }
5585
5586                 /*
5587                   we need to handle the case when we get a
5588                   relative open relative to a file and the
5589                   pathname is blank - this is a reopen!
5590                   (hint from demyn plantenberg)
5591                 */
5592
5593                 status = NT_STATUS_INVALID_HANDLE;
5594                 goto out;
5595         }
5596
5597         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5598                 /*
5599                  * We're at the toplevel dir, the final file name
5600                  * must not contain ./, as this is filtered out
5601                  * normally by srvstr_get_path and unix_convert
5602                  * explicitly rejects paths containing ./.
5603                  */
5604                 parent_fname = talloc_strdup(talloc_tos(), "");
5605                 if (parent_fname == NULL) {
5606                         status = NT_STATUS_NO_MEMORY;
5607                         goto out;
5608                 }
5609         } else {
5610                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5611
5612                 /*
5613                  * Copy in the base directory name.
5614                  */
5615
5616                 parent_fname = talloc_array(talloc_tos(), char,
5617                     dir_name_len+2);
5618                 if (parent_fname == NULL) {
5619                         status = NT_STATUS_NO_MEMORY;
5620                         goto out;
5621                 }
5622                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5623                     dir_name_len+1);
5624
5625                 /*
5626                  * Ensure it ends in a '/'.
5627                  * We used TALLOC_SIZE +2 to add space for the '/'.
5628                  */
5629
5630                 if(dir_name_len
5631                     && (parent_fname[dir_name_len-1] != '\\')
5632                     && (parent_fname[dir_name_len-1] != '/')) {
5633                         parent_fname[dir_name_len] = '/';
5634                         parent_fname[dir_name_len+1] = '\0';
5635                 }
5636         }
5637
5638         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5639                                         smb_fname->base_name);
5640         if (new_base_name == NULL) {
5641                 status = NT_STATUS_NO_MEMORY;
5642                 goto out;
5643         }
5644
5645         status = filename_convert(req,
5646                                 conn,
5647                                 new_base_name,
5648                                 ucf_flags,
5649                                 NULL,
5650                                 NULL,
5651                                 smb_fname_out);
5652         if (!NT_STATUS_IS_OK(status)) {
5653                 goto out;
5654         }
5655
5656  out:
5657         TALLOC_FREE(parent_fname);
5658         TALLOC_FREE(new_base_name);
5659         return status;
5660 }
5661
5662 NTSTATUS create_file_default(connection_struct *conn,
5663                              struct smb_request *req,
5664                              uint16_t root_dir_fid,
5665                              struct smb_filename *smb_fname,
5666                              uint32_t access_mask,
5667                              uint32_t share_access,
5668                              uint32_t create_disposition,
5669                              uint32_t create_options,
5670                              uint32_t file_attributes,
5671                              uint32_t oplock_request,
5672                              struct smb2_lease *lease,
5673                              uint64_t allocation_size,
5674                              uint32_t private_flags,
5675                              struct security_descriptor *sd,
5676                              struct ea_list *ea_list,
5677                              files_struct **result,
5678                              int *pinfo,
5679                              const struct smb2_create_blobs *in_context_blobs,
5680                              struct smb2_create_blobs *out_context_blobs)
5681 {
5682         int info = FILE_WAS_OPENED;
5683         files_struct *fsp = NULL;
5684         NTSTATUS status;
5685         bool stream_name = false;
5686
5687         DBG_DEBUG("create_file: access_mask = 0x%x "
5688                   "file_attributes = 0x%x, share_access = 0x%x, "
5689                   "create_disposition = 0x%x create_options = 0x%x "
5690                   "oplock_request = 0x%x "
5691                   "private_flags = 0x%x "
5692                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5693                   "fname = %s\n",
5694                   (unsigned int)access_mask,
5695                   (unsigned int)file_attributes,
5696                   (unsigned int)share_access,
5697                   (unsigned int)create_disposition,
5698                   (unsigned int)create_options,
5699                   (unsigned int)oplock_request,
5700                   (unsigned int)private_flags,
5701                   (unsigned int)root_dir_fid,
5702                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5703
5704         /*
5705          * Calculate the filename from the root_dir_if if necessary.
5706          */
5707
5708         if (root_dir_fid != 0) {
5709                 struct smb_filename *smb_fname_out = NULL;
5710                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5711                                                    smb_fname, &smb_fname_out);
5712                 if (!NT_STATUS_IS_OK(status)) {
5713                         goto fail;
5714                 }
5715                 smb_fname = smb_fname_out;
5716         }
5717
5718         /*
5719          * Check to see if this is a mac fork of some kind.
5720          */
5721
5722         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5723         if (stream_name) {
5724                 enum FAKE_FILE_TYPE fake_file_type;
5725
5726                 fake_file_type = is_fake_file(smb_fname);
5727
5728                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5729
5730                         /*
5731                          * Here we go! support for changing the disk quotas
5732                          * --metze
5733                          *
5734                          * We need to fake up to open this MAGIC QUOTA file
5735                          * and return a valid FID.
5736                          *
5737                          * w2k close this file directly after openening xp
5738                          * also tries a QUERY_FILE_INFO on the file and then
5739                          * close it
5740                          */
5741                         status = open_fake_file(req, conn, req->vuid,
5742                                                 fake_file_type, smb_fname,
5743                                                 access_mask, &fsp);
5744                         if (!NT_STATUS_IS_OK(status)) {
5745                                 goto fail;
5746                         }
5747
5748                         ZERO_STRUCT(smb_fname->st);
5749                         goto done;
5750                 }
5751
5752                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5753                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5754                         goto fail;
5755                 }
5756         }
5757
5758         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5759                 int ret;
5760                 smb_fname->stream_name = NULL;
5761                 /* We have to handle this error here. */
5762                 if (create_options & FILE_DIRECTORY_FILE) {
5763                         status = NT_STATUS_NOT_A_DIRECTORY;
5764                         goto fail;
5765                 }
5766                 if (req != NULL && req->posix_pathnames) {
5767                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5768                 } else {
5769                         ret = SMB_VFS_STAT(conn, smb_fname);
5770                 }
5771
5772                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5773                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5774                         goto fail;
5775                 }
5776         }
5777
5778         status = create_file_unixpath(
5779                 conn, req, smb_fname, access_mask, share_access,
5780                 create_disposition, create_options, file_attributes,
5781                 oplock_request, lease, allocation_size, private_flags,
5782                 sd, ea_list,
5783                 &fsp, &info);
5784
5785         if (!NT_STATUS_IS_OK(status)) {
5786                 goto fail;
5787         }
5788
5789  done:
5790         DEBUG(10, ("create_file: info=%d\n", info));
5791
5792         *result = fsp;
5793         if (pinfo != NULL) {
5794                 *pinfo = info;
5795         }
5796         return NT_STATUS_OK;
5797
5798  fail:
5799         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5800
5801         if (fsp != NULL) {
5802                 close_file(req, fsp, ERROR_CLOSE);
5803                 fsp = NULL;
5804         }
5805         return status;
5806 }