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/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                 /*
1476                  * note: cleanup should have been done by
1477                  * delay_for_batch_oplocks()
1478                  */
1479                 return false;
1480         }
1481
1482         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1483                   (unsigned int)access_mask, (unsigned int)share_access));
1484
1485         if ((entry->access_mask & (FILE_WRITE_DATA|
1486                                    FILE_APPEND_DATA|
1487                                    FILE_READ_DATA|
1488                                    FILE_EXECUTE|
1489                                    DELETE_ACCESS)) == 0) {
1490                 DEBUG(10,("share_conflict: No conflict due to "
1491                           "entry->access_mask = 0x%x\n",
1492                           (unsigned int)entry->access_mask ));
1493                 return False;
1494         }
1495
1496         if ((access_mask & (FILE_WRITE_DATA|
1497                             FILE_APPEND_DATA|
1498                             FILE_READ_DATA|
1499                             FILE_EXECUTE|
1500                             DELETE_ACCESS)) == 0) {
1501                 DEBUG(10,("share_conflict: No conflict due to "
1502                           "access_mask = 0x%x\n",
1503                           (unsigned int)access_mask ));
1504                 return False;
1505         }
1506
1507 #if 1 /* JRA TEST - Superdebug. */
1508 #define CHECK_MASK(num, am, right, sa, share) \
1509         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1510                 (unsigned int)(num), (unsigned int)(am), \
1511                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1512         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1513                 (unsigned int)(num), (unsigned int)(sa), \
1514                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1515         if (((am) & (right)) && !((sa) & (share))) { \
1516                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1517 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1518                         (unsigned int)(share) )); \
1519                 return True; \
1520         }
1521 #else
1522 #define CHECK_MASK(num, am, right, sa, share) \
1523         if (((am) & (right)) && !((sa) & (share))) { \
1524                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1525 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1526                         (unsigned int)(share) )); \
1527                 return True; \
1528         }
1529 #endif
1530
1531         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1532                    share_access, FILE_SHARE_WRITE);
1533         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1534                    entry->share_access, FILE_SHARE_WRITE);
1535
1536         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1537                    share_access, FILE_SHARE_READ);
1538         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1539                    entry->share_access, FILE_SHARE_READ);
1540
1541         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1542                    share_access, FILE_SHARE_DELETE);
1543         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1544                    entry->share_access, FILE_SHARE_DELETE);
1545
1546         DEBUG(10,("share_conflict: No conflict.\n"));
1547         return False;
1548 }
1549
1550 #if defined(DEVELOPER)
1551 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1552                                       const struct file_id id,
1553                                       int num,
1554                                       struct share_mode_entry *share_entry)
1555 {
1556         struct server_id self = messaging_server_id(sconn->msg_ctx);
1557         files_struct *fsp;
1558
1559         if (!serverid_equal(&self, &share_entry->pid)) {
1560                 return;
1561         }
1562
1563         if (share_entry->op_mid == 0) {
1564                 /* INTERNAL_OPEN_ONLY */
1565                 return;
1566         }
1567
1568         if (!is_valid_share_mode_entry(share_entry)) {
1569                 return;
1570         }
1571
1572         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1573         if (!fsp) {
1574                 DBG_ERR("PANIC : %s\n",
1575                         share_mode_str(talloc_tos(), num, &id,
1576                                        share_entry));
1577                 smb_panic("validate_my_share_entries: Cannot match a "
1578                           "share entry with an open file\n");
1579         }
1580
1581         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1582                 goto panic;
1583         }
1584
1585         return;
1586
1587  panic:
1588         {
1589                 char *str;
1590                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1591                         share_mode_str(talloc_tos(), num, &id,
1592                                        share_entry));
1593                 str = talloc_asprintf(talloc_tos(),
1594                         "validate_my_share_entries: "
1595                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1596                          fsp->fsp_name->base_name,
1597                          (unsigned int)fsp->oplock_type,
1598                          (unsigned int)share_entry->op_type );
1599                 smb_panic(str);
1600         }
1601 }
1602 #endif
1603
1604 bool is_stat_open(uint32_t access_mask)
1605 {
1606         const uint32_t stat_open_bits =
1607                 (SYNCHRONIZE_ACCESS|
1608                  FILE_READ_ATTRIBUTES|
1609                  FILE_WRITE_ATTRIBUTES);
1610
1611         return (((access_mask &  stat_open_bits) != 0) &&
1612                 ((access_mask & ~stat_open_bits) == 0));
1613 }
1614
1615 static bool has_delete_on_close(struct share_mode_lock *lck,
1616                                 uint32_t name_hash)
1617 {
1618         struct share_mode_data *d = lck->data;
1619         uint32_t i;
1620
1621         if (d->num_share_modes == 0) {
1622                 return false;
1623         }
1624         if (!is_delete_on_close_set(lck, name_hash)) {
1625                 return false;
1626         }
1627         for (i=0; i<d->num_share_modes; i++) {
1628                 if (!share_mode_stale_pid(d, i)) {
1629                         return true;
1630                 }
1631         }
1632         return false;
1633 }
1634
1635 /****************************************************************************
1636  Deal with share modes
1637  Invariant: Share mode must be locked on entry and exit.
1638  Returns -1 on error, or number of share modes on success (may be zero).
1639 ****************************************************************************/
1640
1641 static NTSTATUS open_mode_check(connection_struct *conn,
1642                                 struct share_mode_lock *lck,
1643                                 uint32_t access_mask,
1644                                 uint32_t share_access)
1645 {
1646         uint32_t i;
1647
1648         if(lck->data->num_share_modes == 0) {
1649                 return NT_STATUS_OK;
1650         }
1651
1652         if (is_stat_open(access_mask)) {
1653                 /* Stat open that doesn't trigger oplock breaks or share mode
1654                  * checks... ! JRA. */
1655                 return NT_STATUS_OK;
1656         }
1657
1658         /*
1659          * Check if the share modes will give us access.
1660          */
1661
1662 #if defined(DEVELOPER)
1663         for(i = 0; i < lck->data->num_share_modes; i++) {
1664                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1665                                           &lck->data->share_modes[i]);
1666         }
1667 #endif
1668
1669         /* Now we check the share modes, after any oplock breaks. */
1670         for(i = 0; i < lck->data->num_share_modes; i++) {
1671
1672                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1673                         continue;
1674                 }
1675
1676                 /* someone else has a share lock on it, check to see if we can
1677                  * too */
1678                 if (share_conflict(&lck->data->share_modes[i],
1679                                    access_mask, share_access)) {
1680
1681                         if (share_mode_stale_pid(lck->data, i)) {
1682                                 continue;
1683                         }
1684
1685                         return NT_STATUS_SHARING_VIOLATION;
1686                 }
1687         }
1688
1689         return NT_STATUS_OK;
1690 }
1691
1692 /*
1693  * Send a break message to the oplock holder and delay the open for
1694  * our client.
1695  */
1696
1697 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1698                             const struct file_id *id,
1699                             const struct share_mode_entry *exclusive,
1700                             uint16_t break_to)
1701 {
1702         NTSTATUS status;
1703         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1704         struct server_id_buf tmp;
1705
1706         DEBUG(10, ("Sending break request to PID %s\n",
1707                    server_id_str_buf(exclusive->pid, &tmp)));
1708
1709         /* Create the message. */
1710         share_mode_entry_to_message(msg, id, exclusive);
1711
1712         /* Overload entry->op_type */
1713         /*
1714          * This is a cut from uint32_t to uint16_t, but so far only the lower 3
1715          * bits (LEASE_WRITE/HANDLE/READ are used anyway.
1716          */
1717         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1718
1719         status = messaging_send_buf(msg_ctx, exclusive->pid,
1720                                     MSG_SMB_BREAK_REQUEST,
1721                                     (uint8_t *)msg, sizeof(msg));
1722         if (!NT_STATUS_IS_OK(status)) {
1723                 DEBUG(3, ("Could not send oplock break message: %s\n",
1724                           nt_errstr(status)));
1725         }
1726
1727         return status;
1728 }
1729
1730 /*
1731  * Do internal consistency checks on the share mode for a file.
1732  */
1733
1734 static bool validate_oplock_types(struct share_mode_lock *lck)
1735 {
1736         struct share_mode_data *d = lck->data;
1737         bool batch = false;
1738         bool ex_or_batch = false;
1739         bool level2 = false;
1740         bool no_oplock = false;
1741         uint32_t num_non_stat_opens = 0;
1742         uint32_t i;
1743
1744         for (i=0; i<d->num_share_modes; i++) {
1745                 struct share_mode_entry *e = &d->share_modes[i];
1746
1747                 if (!is_valid_share_mode_entry(e)) {
1748                         continue;
1749                 }
1750
1751                 if (e->op_mid == 0) {
1752                         /* INTERNAL_OPEN_ONLY */
1753                         continue;
1754                 }
1755
1756                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1757                         /* We ignore stat opens in the table - they
1758                            always have NO_OPLOCK and never get or
1759                            cause breaks. JRA. */
1760                         continue;
1761                 }
1762
1763                 num_non_stat_opens += 1;
1764
1765                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1766                         /* batch - can only be one. */
1767                         if (share_mode_stale_pid(d, i)) {
1768                                 DEBUG(10, ("Found stale batch oplock\n"));
1769                                 continue;
1770                         }
1771                         if (ex_or_batch || batch || level2 || no_oplock) {
1772                                 DEBUG(0, ("Bad batch oplock entry %u.",
1773                                           (unsigned)i));
1774                                 return false;
1775                         }
1776                         batch = true;
1777                 }
1778
1779                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1780                         if (share_mode_stale_pid(d, i)) {
1781                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1782                                 continue;
1783                         }
1784                         /* Exclusive or batch - can only be one. */
1785                         if (ex_or_batch || level2 || no_oplock) {
1786                                 DEBUG(0, ("Bad exclusive or batch oplock "
1787                                           "entry %u.", (unsigned)i));
1788                                 return false;
1789                         }
1790                         ex_or_batch = true;
1791                 }
1792
1793                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1794                         if (batch || ex_or_batch) {
1795                                 if (share_mode_stale_pid(d, i)) {
1796                                         DEBUG(10, ("Found stale LevelII "
1797                                                    "oplock\n"));
1798                                         continue;
1799                                 }
1800                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1801                                           (unsigned)i));
1802                                 return false;
1803                         }
1804                         level2 = true;
1805                 }
1806
1807                 if (e->op_type == NO_OPLOCK) {
1808                         if (batch || ex_or_batch) {
1809                                 if (share_mode_stale_pid(d, i)) {
1810                                         DEBUG(10, ("Found stale NO_OPLOCK "
1811                                                    "entry\n"));
1812                                         continue;
1813                                 }
1814                                 DEBUG(0, ("Bad no oplock entry %u.",
1815                                           (unsigned)i));
1816                                 return false;
1817                         }
1818                         no_oplock = true;
1819                 }
1820         }
1821
1822         remove_stale_share_mode_entries(d);
1823
1824         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1825                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1826                           (int)batch, (int)ex_or_batch,
1827                           (int)d->num_share_modes));
1828                 return false;
1829         }
1830
1831         return true;
1832 }
1833
1834 static bool delay_for_oplock(files_struct *fsp,
1835                              int oplock_request,
1836                              const struct smb2_lease *lease,
1837                              struct share_mode_lock *lck,
1838                              bool have_sharing_violation,
1839                              uint32_t create_disposition,
1840                              bool first_open_attempt)
1841 {
1842         struct share_mode_data *d = lck->data;
1843         uint32_t i;
1844         bool delay = false;
1845         bool will_overwrite;
1846
1847         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1848             is_stat_open(fsp->access_mask)) {
1849                 return false;
1850         }
1851
1852         switch (create_disposition) {
1853         case FILE_SUPERSEDE:
1854         case FILE_OVERWRITE:
1855         case FILE_OVERWRITE_IF:
1856                 will_overwrite = true;
1857                 break;
1858         default:
1859                 will_overwrite = false;
1860                 break;
1861         }
1862
1863         for (i=0; i<d->num_share_modes; i++) {
1864                 struct share_mode_entry *e = &d->share_modes[i];
1865                 bool e_is_lease = (e->op_type == LEASE_OPLOCK);
1866                 struct share_mode_lease *l = NULL;
1867                 uint32_t e_lease_type = get_lease_type(d, e);
1868                 uint32_t break_to;
1869                 uint32_t delay_mask = 0;
1870
1871                 if (e_is_lease) {
1872                         l = &d->leases[e->lease_idx];
1873                 }
1874
1875                 if (have_sharing_violation) {
1876                         delay_mask = SMB2_LEASE_HANDLE;
1877                 } else {
1878                         delay_mask = SMB2_LEASE_WRITE;
1879                 }
1880
1881                 break_to = e_lease_type & ~delay_mask;
1882
1883                 if (will_overwrite) {
1884                         /*
1885                          * we'll decide about SMB2_LEASE_READ later.
1886                          *
1887                          * Maybe the break will be deferred
1888                          */
1889                         break_to &= ~SMB2_LEASE_HANDLE;
1890                 }
1891
1892                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1893                            (unsigned)i, (unsigned)e_lease_type,
1894                            (unsigned)will_overwrite));
1895
1896                 if (e_is_lease && lease != NULL) {
1897                         bool ign;
1898
1899                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1900                                                &lease->lease_key,
1901                                                &l->client_guid,
1902                                                &l->lease_key);
1903                         if (ign) {
1904                                 continue;
1905                         }
1906                 }
1907
1908                 if ((e_lease_type & ~break_to) == 0) {
1909                         if (e_is_lease && l->breaking) {
1910                                 delay = true;
1911                         }
1912                         continue;
1913                 }
1914
1915                 if (share_mode_stale_pid(d, i)) {
1916                         continue;
1917                 }
1918
1919                 if (will_overwrite) {
1920                         /*
1921                          * If we break anyway break to NONE directly.
1922                          * Otherwise vfs_set_filelen() will trigger the
1923                          * break.
1924                          */
1925                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1926                 }
1927
1928                 if (!e_is_lease) {
1929                         /*
1930                          * Oplocks only support breaking to R or NONE.
1931                          */
1932                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1933                 }
1934
1935                 DEBUG(10, ("breaking from %d to %d\n",
1936                            (int)e_lease_type, (int)break_to));
1937                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1938                                    e, break_to);
1939                 if (e_lease_type & delay_mask) {
1940                         delay = true;
1941                 }
1942                 if (e_is_lease && l->breaking && !first_open_attempt) {
1943                         delay = true;
1944                 }
1945                 continue;
1946         }
1947
1948         return delay;
1949 }
1950
1951 static bool file_has_brlocks(files_struct *fsp)
1952 {
1953         struct byte_range_lock *br_lck;
1954
1955         br_lck = brl_get_locks_readonly(fsp);
1956         if (!br_lck)
1957                 return false;
1958
1959         return (brl_num_locks(br_lck) > 0);
1960 }
1961
1962 int find_share_mode_lease(struct share_mode_data *d,
1963                           const struct GUID *client_guid,
1964                           const struct smb2_lease_key *key)
1965 {
1966         uint32_t i;
1967
1968         for (i=0; i<d->num_leases; i++) {
1969                 struct share_mode_lease *l = &d->leases[i];
1970
1971                 if (smb2_lease_equal(client_guid,
1972                                      key,
1973                                      &l->client_guid,
1974                                      &l->lease_key)) {
1975                         return i;
1976                 }
1977         }
1978
1979         return -1;
1980 }
1981
1982 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1983                                  const struct smb2_lease_key *key,
1984                                  const struct share_mode_lease *l)
1985 {
1986         struct files_struct *fsp;
1987
1988         /*
1989          * TODO: Measure how expensive this loop is with thousands of open
1990          * handles...
1991          */
1992
1993         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1994              fsp != NULL;
1995              fsp = file_find_di_next(fsp)) {
1996
1997                 if (fsp == new_fsp) {
1998                         continue;
1999                 }
2000                 if (fsp->oplock_type != LEASE_OPLOCK) {
2001                         continue;
2002                 }
2003                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
2004                         fsp->lease->ref_count += 1;
2005                         return fsp->lease;
2006                 }
2007         }
2008
2009         /* Not found - must be leased in another smbd. */
2010         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2011         if (new_fsp->lease == NULL) {
2012                 return NULL;
2013         }
2014         new_fsp->lease->ref_count = 1;
2015         new_fsp->lease->sconn = new_fsp->conn->sconn;
2016         new_fsp->lease->lease.lease_key = *key;
2017         new_fsp->lease->lease.lease_state = l->current_state;
2018         /*
2019          * We internally treat all leases as V2 and update
2020          * the epoch, but when sending breaks it matters if
2021          * the requesting lease was v1 or v2.
2022          */
2023         new_fsp->lease->lease.lease_version = l->lease_version;
2024         new_fsp->lease->lease.lease_epoch = l->epoch;
2025         return new_fsp->lease;
2026 }
2027
2028 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2029                                 struct share_mode_lock *lck,
2030                                 const struct smb2_lease *lease,
2031                                 uint32_t *p_lease_idx,
2032                                 uint32_t granted)
2033 {
2034         struct share_mode_data *d = lck->data;
2035         const struct GUID *client_guid = fsp_client_guid(fsp);
2036         struct share_mode_lease *tmp;
2037         NTSTATUS status;
2038         int idx;
2039
2040         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2041
2042         if (idx != -1) {
2043                 struct share_mode_lease *l = &d->leases[idx];
2044                 bool do_upgrade;
2045                 uint32_t existing, requested;
2046
2047                 fsp->lease = find_fsp_lease(fsp, &lease->lease_key, l);
2048                 if (fsp->lease == NULL) {
2049                         DEBUG(1, ("Did not find existing lease for file %s\n",
2050                                   fsp_str_dbg(fsp)));
2051                         return NT_STATUS_NO_MEMORY;
2052                 }
2053
2054                 *p_lease_idx = idx;
2055
2056                 /*
2057                  * Upgrade only if the requested lease is a strict upgrade.
2058                  */
2059                 existing = l->current_state;
2060                 requested = lease->lease_state;
2061
2062                 /*
2063                  * Tricky: This test makes sure that "requested" is a
2064                  * strict bitwise superset of "existing".
2065                  */
2066                 do_upgrade = ((existing & requested) == existing);
2067
2068                 /*
2069                  * Upgrade only if there's a change.
2070                  */
2071                 do_upgrade &= (granted != existing);
2072
2073                 /*
2074                  * Upgrade only if other leases don't prevent what was asked
2075                  * for.
2076                  */
2077                 do_upgrade &= (granted == requested);
2078
2079                 /*
2080                  * only upgrade if we are not in breaking state
2081                  */
2082                 do_upgrade &= !l->breaking;
2083
2084                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2085                            "granted=%"PRIu32", do_upgrade=%d\n",
2086                            existing, requested, granted, (int)do_upgrade));
2087
2088                 if (do_upgrade) {
2089                         l->current_state = granted;
2090                         l->epoch += 1;
2091                 }
2092
2093                 /* Ensure we're in sync with current lease state. */
2094                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2095                 return NT_STATUS_OK;
2096         }
2097
2098         /*
2099          * Create new lease
2100          */
2101
2102         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2103                              d->num_leases+1);
2104         if (tmp == NULL) {
2105                 /*
2106                  * See [MS-SMB2]
2107                  */
2108                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2109         }
2110         d->leases = tmp;
2111
2112         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2113         if (fsp->lease == NULL) {
2114                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2115         }
2116         fsp->lease->ref_count = 1;
2117         fsp->lease->sconn = fsp->conn->sconn;
2118         fsp->lease->lease.lease_version = lease->lease_version;
2119         fsp->lease->lease.lease_key = lease->lease_key;
2120         fsp->lease->lease.lease_state = granted;
2121         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2122
2123         *p_lease_idx = d->num_leases;
2124
2125         d->leases[d->num_leases] = (struct share_mode_lease) {
2126                 .client_guid = *client_guid,
2127                 .lease_key = fsp->lease->lease.lease_key,
2128                 .current_state = fsp->lease->lease.lease_state,
2129                 .lease_version = fsp->lease->lease.lease_version,
2130                 .epoch = fsp->lease->lease.lease_epoch,
2131         };
2132
2133         status = leases_db_add(client_guid,
2134                                &lease->lease_key,
2135                                &fsp->file_id,
2136                                fsp->conn->connectpath,
2137                                fsp->fsp_name->base_name,
2138                                fsp->fsp_name->stream_name);
2139         if (!NT_STATUS_IS_OK(status)) {
2140                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2141                            nt_errstr(status)));
2142                 TALLOC_FREE(fsp->lease);
2143                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2144         }
2145
2146         d->num_leases += 1;
2147         d->modified = true;
2148
2149         return NT_STATUS_OK;
2150 }
2151
2152 static bool is_same_lease(const files_struct *fsp,
2153                           const struct share_mode_data *d,
2154                           const struct share_mode_entry *e,
2155                           const struct smb2_lease *lease)
2156 {
2157         if (e->op_type != LEASE_OPLOCK) {
2158                 return false;
2159         }
2160         if (lease == NULL) {
2161                 return false;
2162         }
2163
2164         return smb2_lease_equal(fsp_client_guid(fsp),
2165                                 &lease->lease_key,
2166                                 &d->leases[e->lease_idx].client_guid,
2167                                 &d->leases[e->lease_idx].lease_key);
2168 }
2169
2170 static int map_lease_type_to_oplock(uint32_t lease_type)
2171 {
2172         int result = NO_OPLOCK;
2173
2174         switch (lease_type) {
2175         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2176                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2177                 break;
2178         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2179                 result = EXCLUSIVE_OPLOCK;
2180                 break;
2181         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2182         case SMB2_LEASE_READ:
2183                 result = LEVEL_II_OPLOCK;
2184                 break;
2185         }
2186
2187         return result;
2188 }
2189
2190 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2191                                       struct files_struct *fsp,
2192                                       struct share_mode_lock *lck,
2193                                       int oplock_request,
2194                                       struct smb2_lease *lease)
2195 {
2196         struct share_mode_data *d = lck->data;
2197         bool got_handle_lease = false;
2198         bool got_oplock = false;
2199         uint32_t i;
2200         uint32_t granted;
2201         uint32_t lease_idx = UINT32_MAX;
2202         bool ok;
2203         NTSTATUS status;
2204
2205         if (oplock_request & INTERNAL_OPEN_ONLY) {
2206                 /* No oplocks on internal open. */
2207                 oplock_request = NO_OPLOCK;
2208                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2209                         fsp->oplock_type, fsp_str_dbg(fsp)));
2210         }
2211
2212         if (oplock_request == LEASE_OPLOCK) {
2213                 if (lease == NULL) {
2214                         /*
2215                          * The SMB2 layer should have checked this
2216                          */
2217                         return NT_STATUS_INTERNAL_ERROR;
2218                 }
2219
2220                 granted = lease->lease_state;
2221
2222                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2223                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2224                         granted = SMB2_LEASE_NONE;
2225                 }
2226                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2227                         DEBUG(10, ("No read or write lease requested\n"));
2228                         granted = SMB2_LEASE_NONE;
2229                 }
2230                 if (granted == SMB2_LEASE_WRITE) {
2231                         DEBUG(10, ("pure write lease requested\n"));
2232                         granted = SMB2_LEASE_NONE;
2233                 }
2234                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2235                         DEBUG(10, ("write and handle lease requested\n"));
2236                         granted = SMB2_LEASE_NONE;
2237                 }
2238         } else {
2239                 granted = map_oplock_to_lease_type(
2240                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2241         }
2242
2243         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2244                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2245                         fsp_str_dbg(fsp)));
2246                 granted &= ~SMB2_LEASE_READ;
2247         }
2248
2249         for (i=0; i<d->num_share_modes; i++) {
2250                 struct share_mode_entry *e = &d->share_modes[i];
2251                 uint32_t e_lease_type;
2252
2253                 e_lease_type = get_lease_type(d, e);
2254
2255                 if ((granted & SMB2_LEASE_WRITE) &&
2256                     !is_same_lease(fsp, d, e, lease) &&
2257                     !share_mode_stale_pid(d, i)) {
2258                         /*
2259                          * Can grant only one writer
2260                          */
2261                         granted &= ~SMB2_LEASE_WRITE;
2262                 }
2263
2264                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2265                     !share_mode_stale_pid(d, i)) {
2266                         got_handle_lease = true;
2267                 }
2268
2269                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2270                     !share_mode_stale_pid(d, i)) {
2271                         got_oplock = true;
2272                 }
2273         }
2274
2275         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2276                 bool allow_level2 =
2277                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2278                         lp_level2_oplocks(SNUM(fsp->conn));
2279
2280                 if (!allow_level2) {
2281                         granted = SMB2_LEASE_NONE;
2282                 }
2283         }
2284
2285         if (oplock_request == LEASE_OPLOCK) {
2286                 if (got_oplock) {
2287                         granted &= ~SMB2_LEASE_HANDLE;
2288                 }
2289
2290                 fsp->oplock_type = LEASE_OPLOCK;
2291
2292                 status = grant_fsp_lease(fsp, lck, lease, &lease_idx,
2293                                          granted);
2294                 if (!NT_STATUS_IS_OK(status)) {
2295                         return status;
2296
2297                 }
2298                 *lease = fsp->lease->lease;
2299                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2300         } else {
2301                 if (got_handle_lease) {
2302                         granted = SMB2_LEASE_NONE;
2303                 }
2304
2305                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2306
2307                 status = set_file_oplock(fsp);
2308                 if (!NT_STATUS_IS_OK(status)) {
2309                         /*
2310                          * Could not get the kernel oplock
2311                          */
2312                         fsp->oplock_type = NO_OPLOCK;
2313                 }
2314         }
2315
2316         ok = set_share_mode(lck, fsp, get_current_uid(fsp->conn),
2317                             req ? req->mid : 0,
2318                             fsp->oplock_type,
2319                             lease_idx);
2320         if (!ok) {
2321                 return NT_STATUS_NO_MEMORY;
2322         }
2323
2324         ok = update_num_read_oplocks(fsp, lck);
2325         if (!ok) {
2326                 del_share_mode(lck, fsp);
2327                 return NT_STATUS_INTERNAL_ERROR;
2328         }
2329
2330         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2331                   fsp->oplock_type, fsp_str_dbg(fsp)));
2332
2333         return NT_STATUS_OK;
2334 }
2335
2336 static bool request_timed_out(struct timeval request_time,
2337                               struct timeval timeout)
2338 {
2339         struct timeval now, end_time;
2340         GetTimeOfDay(&now);
2341         end_time = timeval_sum(&request_time, &timeout);
2342         return (timeval_compare(&end_time, &now) < 0);
2343 }
2344
2345 static struct deferred_open_record *deferred_open_record_create(
2346         bool delayed_for_oplocks,
2347         bool async_open,
2348         struct file_id id)
2349 {
2350         struct deferred_open_record *record = NULL;
2351
2352         record = talloc(NULL, struct deferred_open_record);
2353         if (record == NULL) {
2354                 return NULL;
2355         }
2356
2357         *record = (struct deferred_open_record) {
2358                 .delayed_for_oplocks = delayed_for_oplocks,
2359                 .async_open = async_open,
2360                 .id = id,
2361         };
2362
2363         return record;
2364 }
2365
2366 struct defer_open_state {
2367         struct smbXsrv_connection *xconn;
2368         uint64_t mid;
2369 };
2370
2371 static void defer_open_done(struct tevent_req *req);
2372
2373 /**
2374  * Defer an open and watch a locking.tdb record
2375  *
2376  * This defers an open that gets rescheduled once the locking.tdb record watch
2377  * is triggered by a change to the record.
2378  *
2379  * It is used to defer opens that triggered an oplock break and for the SMB1
2380  * sharing violation delay.
2381  **/
2382 static void defer_open(struct share_mode_lock *lck,
2383                        struct timeval request_time,
2384                        struct timeval timeout,
2385                        struct smb_request *req,
2386                        bool delayed_for_oplocks,
2387                        struct file_id id)
2388 {
2389         struct deferred_open_record *open_rec = NULL;
2390         struct timeval abs_timeout;
2391         struct defer_open_state *watch_state;
2392         struct tevent_req *watch_req;
2393         bool ok;
2394
2395         abs_timeout = timeval_sum(&request_time, &timeout);
2396
2397         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2398                   "delayed_for_oplocks [%s] file_id [%s]\n",
2399                   timeval_string(talloc_tos(), &request_time, false),
2400                   timeval_string(talloc_tos(), &abs_timeout, false),
2401                   req->mid,
2402                   delayed_for_oplocks ? "yes" : "no",
2403                   file_id_string_tos(&id));
2404
2405         open_rec = deferred_open_record_create(delayed_for_oplocks,
2406                                                false,
2407                                                id);
2408         if (open_rec == NULL) {
2409                 TALLOC_FREE(lck);
2410                 exit_server("talloc failed");
2411         }
2412
2413         watch_state = talloc(open_rec, struct defer_open_state);
2414         if (watch_state == NULL) {
2415                 exit_server("talloc failed");
2416         }
2417         watch_state->xconn = req->xconn;
2418         watch_state->mid = req->mid;
2419
2420         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2421
2422         watch_req = dbwrap_watched_watch_send(watch_state,
2423                                               req->sconn->ev_ctx,
2424                                               lck->data->record,
2425                                               (struct server_id){0});
2426         if (watch_req == NULL) {
2427                 exit_server("Could not watch share mode record");
2428         }
2429         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2430
2431         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2432         if (!ok) {
2433                 exit_server("tevent_req_set_endtime failed");
2434         }
2435
2436         ok = push_deferred_open_message_smb(req, request_time, timeout,
2437                                             open_rec->id, open_rec);
2438         if (!ok) {
2439                 TALLOC_FREE(lck);
2440                 exit_server("push_deferred_open_message_smb failed");
2441         }
2442 }
2443
2444 static void defer_open_done(struct tevent_req *req)
2445 {
2446         struct defer_open_state *state = tevent_req_callback_data(
2447                 req, struct defer_open_state);
2448         NTSTATUS status;
2449         bool ret;
2450
2451         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2452         TALLOC_FREE(req);
2453         if (!NT_STATUS_IS_OK(status)) {
2454                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2455                           nt_errstr(status)));
2456                 /*
2457                  * Even if it failed, retry anyway. TODO: We need a way to
2458                  * tell a re-scheduled open about that error.
2459                  */
2460         }
2461
2462         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2463
2464         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2465         SMB_ASSERT(ret);
2466         TALLOC_FREE(state);
2467 }
2468
2469 /**
2470  * Actually attempt the kernel oplock polling open.
2471  */
2472
2473 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2474                                       struct tevent_timer *te,
2475                                       struct timeval current_time,
2476                                       void *private_data)
2477 {
2478         bool ok;
2479         struct smb_request *req = (struct smb_request *)private_data;
2480
2481         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2482         if (!ok) {
2483                 exit_server("schedule_deferred_open_message_smb failed");
2484         }
2485         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2486 }
2487
2488 /**
2489  * Reschedule an open for 1 second from now, if not timed out.
2490  **/
2491 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2492                        struct smb_request *req,
2493                        struct file_id id)
2494 {
2495
2496         bool ok;
2497         struct deferred_open_record *open_rec = NULL;
2498         /* Maximum wait time. */
2499         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2500
2501         if (request_timed_out(request_time, timeout)) {
2502                 return;
2503         }
2504
2505         open_rec = deferred_open_record_create(false, false, id);
2506         if (open_rec == NULL) {
2507                 exit_server("talloc failed");
2508         }
2509
2510         ok = push_deferred_open_message_smb(req,
2511                                             request_time,
2512                                             timeout,
2513                                             id,
2514                                             open_rec);
2515         if (!ok) {
2516                 exit_server("push_deferred_open_message_smb failed");
2517         }
2518
2519         /*
2520          * As this timer event is owned by req, it will
2521          * disappear if req it talloc_freed.
2522          */
2523         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2524                                         req,
2525                                         timeval_current_ofs(1, 0),
2526                                         kernel_oplock_poll_open_timer,
2527                                         req);
2528         if (open_rec->te == NULL) {
2529                 exit_server("tevent_add_timer failed");
2530         }
2531
2532         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2533                   timeval_string(talloc_tos(), &request_time, false),
2534                   req->mid,
2535                   file_id_string_tos(&id));
2536 }
2537
2538 /****************************************************************************
2539  On overwrite open ensure that the attributes match.
2540 ****************************************************************************/
2541
2542 static bool open_match_attributes(connection_struct *conn,
2543                                   uint32_t old_dos_attr,
2544                                   uint32_t new_dos_attr,
2545                                   mode_t new_unx_mode,
2546                                   mode_t *returned_unx_mode)
2547 {
2548         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2549
2550         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2551         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2552
2553         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2554            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2555                 *returned_unx_mode = new_unx_mode;
2556         } else {
2557                 *returned_unx_mode = (mode_t)0;
2558         }
2559
2560         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2561                   "new_dos_attr = 0x%x "
2562                   "returned_unx_mode = 0%o\n",
2563                   (unsigned int)old_dos_attr,
2564                   (unsigned int)new_dos_attr,
2565                   (unsigned int)*returned_unx_mode ));
2566
2567         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2568         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2569                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2570                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2571                         return False;
2572                 }
2573         }
2574         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2575                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2576                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2577                         return False;
2578                 }
2579         }
2580         return True;
2581 }
2582
2583 /****************************************************************************
2584  Special FCB or DOS processing in the case of a sharing violation.
2585  Try and find a duplicated file handle.
2586 ****************************************************************************/
2587
2588 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2589                                 connection_struct *conn,
2590                                 files_struct *fsp_to_dup_into,
2591                                 const struct smb_filename *smb_fname,
2592                                 struct file_id id,
2593                                 uint16_t file_pid,
2594                                 uint64_t vuid,
2595                                 uint32_t access_mask,
2596                                 uint32_t share_access,
2597                                 uint32_t create_options)
2598 {
2599         files_struct *fsp;
2600
2601         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2602                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2603
2604         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2605             fsp = file_find_di_next(fsp)) {
2606
2607                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2608                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2609                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2610                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2611                           (unsigned int)fsp->file_pid,
2612                           (unsigned int)fsp->fh->private_options,
2613                           (unsigned int)fsp->access_mask ));
2614
2615                 if (fsp != fsp_to_dup_into &&
2616                     fsp->fh->fd != -1 &&
2617                     fsp->vuid == vuid &&
2618                     fsp->file_pid == file_pid &&
2619                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2620                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2621                     (fsp->access_mask & FILE_WRITE_DATA) &&
2622                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2623                     strequal(fsp->fsp_name->stream_name,
2624                              smb_fname->stream_name)) {
2625                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2626                         break;
2627                 }
2628         }
2629
2630         if (!fsp) {
2631                 return NT_STATUS_NOT_FOUND;
2632         }
2633
2634         /* quite an insane set of semantics ... */
2635         if (is_executable(smb_fname->base_name) &&
2636             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2637                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2638                 return NT_STATUS_INVALID_PARAMETER;
2639         }
2640
2641         /* We need to duplicate this fsp. */
2642         return dup_file_fsp(req, fsp, access_mask, share_access,
2643                             create_options, fsp_to_dup_into);
2644 }
2645
2646 static void schedule_defer_open(struct share_mode_lock *lck,
2647                                 struct file_id id,
2648                                 struct timeval request_time,
2649                                 struct smb_request *req)
2650 {
2651         /* This is a relative time, added to the absolute
2652            request_time value to get the absolute timeout time.
2653            Note that if this is the second or greater time we enter
2654            this codepath for this particular request mid then
2655            request_time is left as the absolute time of the *first*
2656            time this request mid was processed. This is what allows
2657            the request to eventually time out. */
2658
2659         struct timeval timeout;
2660
2661         /* Normally the smbd we asked should respond within
2662          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2663          * the client did, give twice the timeout as a safety
2664          * measure here in case the other smbd is stuck
2665          * somewhere else. */
2666
2667         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2668
2669         if (request_timed_out(request_time, timeout)) {
2670                 return;
2671         }
2672
2673         defer_open(lck, request_time, timeout, req, true, id);
2674 }
2675
2676 /****************************************************************************
2677  Reschedule an open call that went asynchronous.
2678 ****************************************************************************/
2679
2680 static void schedule_async_open_timer(struct tevent_context *ev,
2681                                       struct tevent_timer *te,
2682                                       struct timeval current_time,
2683                                       void *private_data)
2684 {
2685         exit_server("async open timeout");
2686 }
2687
2688 static void schedule_async_open(struct timeval request_time,
2689                                 struct smb_request *req)
2690 {
2691         struct deferred_open_record *open_rec = NULL;
2692         struct timeval timeout = timeval_set(20, 0);
2693         bool ok;
2694
2695         if (request_timed_out(request_time, timeout)) {
2696                 return;
2697         }
2698
2699         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2700         if (open_rec == NULL) {
2701                 exit_server("deferred_open_record_create failed");
2702         }
2703
2704         ok = push_deferred_open_message_smb(req, request_time, timeout,
2705                                             (struct file_id){0}, open_rec);
2706         if (!ok) {
2707                 exit_server("push_deferred_open_message_smb failed");
2708         }
2709
2710         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2711                                         req,
2712                                         timeval_current_ofs(20, 0),
2713                                         schedule_async_open_timer,
2714                                         open_rec);
2715         if (open_rec->te == NULL) {
2716                 exit_server("tevent_add_timer failed");
2717         }
2718 }
2719
2720 /****************************************************************************
2721  Work out what access_mask to use from what the client sent us.
2722 ****************************************************************************/
2723
2724 static NTSTATUS smbd_calculate_maximum_allowed_access(
2725         connection_struct *conn,
2726         const struct smb_filename *smb_fname,
2727         bool use_privs,
2728         uint32_t *p_access_mask)
2729 {
2730         struct security_descriptor *sd;
2731         uint32_t access_granted;
2732         NTSTATUS status;
2733
2734         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2735                 *p_access_mask |= FILE_GENERIC_ALL;
2736                 return NT_STATUS_OK;
2737         }
2738
2739         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2740                                     (SECINFO_OWNER |
2741                                      SECINFO_GROUP |
2742                                      SECINFO_DACL),
2743                                     talloc_tos(), &sd);
2744
2745         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2746                 /*
2747                  * File did not exist
2748                  */
2749                 *p_access_mask = FILE_GENERIC_ALL;
2750                 return NT_STATUS_OK;
2751         }
2752         if (!NT_STATUS_IS_OK(status)) {
2753                 DEBUG(10,("Could not get acl on file %s: %s\n",
2754                           smb_fname_str_dbg(smb_fname),
2755                           nt_errstr(status)));
2756                 return NT_STATUS_ACCESS_DENIED;
2757         }
2758
2759         /*
2760          * If we can access the path to this file, by
2761          * default we have FILE_READ_ATTRIBUTES from the
2762          * containing directory. See the section:
2763          * "Algorithm to Check Access to an Existing File"
2764          * in MS-FSA.pdf.
2765          *
2766          * se_file_access_check()
2767          * also takes care of owner WRITE_DAC and READ_CONTROL.
2768          */
2769         status = se_file_access_check(sd,
2770                                  get_current_nttok(conn),
2771                                  use_privs,
2772                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2773                                  &access_granted);
2774
2775         TALLOC_FREE(sd);
2776
2777         if (!NT_STATUS_IS_OK(status)) {
2778                 DEBUG(10, ("Access denied on file %s: "
2779                            "when calculating maximum access\n",
2780                            smb_fname_str_dbg(smb_fname)));
2781                 return NT_STATUS_ACCESS_DENIED;
2782         }
2783         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2784
2785         if (!(access_granted & DELETE_ACCESS)) {
2786                 if (can_delete_file_in_directory(conn, smb_fname)) {
2787                         *p_access_mask |= DELETE_ACCESS;
2788                 }
2789         }
2790
2791         return NT_STATUS_OK;
2792 }
2793
2794 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2795                                     const struct smb_filename *smb_fname,
2796                                     bool use_privs,
2797                                     uint32_t access_mask,
2798                                     uint32_t *access_mask_out)
2799 {
2800         NTSTATUS status;
2801         uint32_t orig_access_mask = access_mask;
2802         uint32_t rejected_share_access;
2803
2804         if (access_mask & SEC_MASK_INVALID) {
2805                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2806                           access_mask);
2807                 return NT_STATUS_ACCESS_DENIED;
2808         }
2809
2810         /*
2811          * Convert GENERIC bits to specific bits.
2812          */
2813
2814         se_map_generic(&access_mask, &file_generic_mapping);
2815
2816         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2817         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2818
2819                 status = smbd_calculate_maximum_allowed_access(
2820                         conn, smb_fname, use_privs, &access_mask);
2821
2822                 if (!NT_STATUS_IS_OK(status)) {
2823                         return status;
2824                 }
2825
2826                 access_mask &= conn->share_access;
2827         }
2828
2829         rejected_share_access = access_mask & ~(conn->share_access);
2830
2831         if (rejected_share_access) {
2832                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2833                         "file %s: rejected by share access mask[0x%08X] "
2834                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2835                         smb_fname_str_dbg(smb_fname),
2836                         conn->share_access,
2837                         orig_access_mask, access_mask,
2838                         rejected_share_access));
2839                 return NT_STATUS_ACCESS_DENIED;
2840         }
2841
2842         *access_mask_out = access_mask;
2843         return NT_STATUS_OK;
2844 }
2845
2846 /****************************************************************************
2847  Remove the deferred open entry under lock.
2848 ****************************************************************************/
2849
2850 /****************************************************************************
2851  Return true if this is a state pointer to an asynchronous create.
2852 ****************************************************************************/
2853
2854 bool is_deferred_open_async(const struct deferred_open_record *rec)
2855 {
2856         return rec->async_open;
2857 }
2858
2859 static bool clear_ads(uint32_t create_disposition)
2860 {
2861         bool ret = false;
2862
2863         switch (create_disposition) {
2864         case FILE_SUPERSEDE:
2865         case FILE_OVERWRITE_IF:
2866         case FILE_OVERWRITE:
2867                 ret = true;
2868                 break;
2869         default:
2870                 break;
2871         }
2872         return ret;
2873 }
2874
2875 static int disposition_to_open_flags(uint32_t create_disposition)
2876 {
2877         int ret = 0;
2878
2879         /*
2880          * Currently we're using FILE_SUPERSEDE as the same as
2881          * FILE_OVERWRITE_IF but they really are
2882          * different. FILE_SUPERSEDE deletes an existing file
2883          * (requiring delete access) then recreates it.
2884          */
2885
2886         switch (create_disposition) {
2887         case FILE_SUPERSEDE:
2888         case FILE_OVERWRITE_IF:
2889                 /*
2890                  * If file exists replace/overwrite. If file doesn't
2891                  * exist create.
2892                  */
2893                 ret = O_CREAT|O_TRUNC;
2894                 break;
2895
2896         case FILE_OPEN:
2897                 /*
2898                  * If file exists open. If file doesn't exist error.
2899                  */
2900                 ret = 0;
2901                 break;
2902
2903         case FILE_OVERWRITE:
2904                 /*
2905                  * If file exists overwrite. If file doesn't exist
2906                  * error.
2907                  */
2908                 ret = O_TRUNC;
2909                 break;
2910
2911         case FILE_CREATE:
2912                 /*
2913                  * If file exists error. If file doesn't exist create.
2914                  */
2915                 ret = O_CREAT|O_EXCL;
2916                 break;
2917
2918         case FILE_OPEN_IF:
2919                 /*
2920                  * If file exists open. If file doesn't exist create.
2921                  */
2922                 ret = O_CREAT;
2923                 break;
2924         }
2925         return ret;
2926 }
2927
2928 static int calculate_open_access_flags(uint32_t access_mask,
2929                                        uint32_t private_flags)
2930 {
2931         bool need_write, need_read;
2932
2933         /*
2934          * Note that we ignore the append flag as append does not
2935          * mean the same thing under DOS and Unix.
2936          */
2937
2938         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2939         if (!need_write) {
2940                 return O_RDONLY;
2941         }
2942
2943         /* DENY_DOS opens are always underlying read-write on the
2944            file handle, no matter what the requested access mask
2945            says. */
2946
2947         need_read =
2948                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2949                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2950                                 FILE_READ_EA|FILE_EXECUTE));
2951
2952         if (!need_read) {
2953                 return O_WRONLY;
2954         }
2955         return O_RDWR;
2956 }
2957
2958 /****************************************************************************
2959  Open a file with a share mode. Passed in an already created files_struct *.
2960 ****************************************************************************/
2961
2962 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2963                             struct smb_request *req,
2964                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
2965                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
2966                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
2967                             uint32_t create_options,    /* options such as delete on close. */
2968                             uint32_t new_dos_attributes,        /* attributes used for new file. */
2969                             int oplock_request,         /* internal Samba oplock codes. */
2970                             struct smb2_lease *lease,
2971                                                         /* Information (FILE_EXISTS etc.) */
2972                             uint32_t private_flags,     /* Samba specific flags. */
2973                             int *pinfo,
2974                             files_struct *fsp)
2975 {
2976         struct smb_filename *smb_fname = fsp->fsp_name;
2977         int flags=0;
2978         int flags2=0;
2979         bool file_existed = VALID_STAT(smb_fname->st);
2980         bool def_acl = False;
2981         bool posix_open = False;
2982         bool new_file_created = False;
2983         bool first_open_attempt = true;
2984         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
2985         mode_t new_unx_mode = (mode_t)0;
2986         mode_t unx_mode = (mode_t)0;
2987         int info;
2988         uint32_t existing_dos_attributes = 0;
2989         struct timeval request_time = timeval_zero();
2990         struct share_mode_lock *lck = NULL;
2991         uint32_t open_access_mask = access_mask;
2992         NTSTATUS status;
2993         char *parent_dir;
2994         SMB_STRUCT_STAT saved_stat = smb_fname->st;
2995         struct timespec old_write_time;
2996         struct file_id id;
2997
2998         if (conn->printer) {
2999                 /*
3000                  * Printers are handled completely differently.
3001                  * Most of the passed parameters are ignored.
3002                  */
3003
3004                 if (pinfo) {
3005                         *pinfo = FILE_WAS_CREATED;
3006                 }
3007
3008                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
3009                            smb_fname_str_dbg(smb_fname)));
3010
3011                 if (!req) {
3012                         DEBUG(0,("open_file_ntcreate: printer open without "
3013                                 "an SMB request!\n"));
3014                         return NT_STATUS_INTERNAL_ERROR;
3015                 }
3016
3017                 return print_spool_open(fsp, smb_fname->base_name,
3018                                         req->vuid);
3019         }
3020
3021         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3022                             NULL)) {
3023                 return NT_STATUS_NO_MEMORY;
3024         }
3025
3026         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3027                 posix_open = True;
3028                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3029                 new_dos_attributes = 0;
3030         } else {
3031                 /* Windows allows a new file to be created and
3032                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3033                    sent by the client. Do the same. */
3034
3035                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3036
3037                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3038                  * created new. */
3039                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3040                                      smb_fname, parent_dir);
3041         }
3042
3043         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3044                    "access_mask=0x%x share_access=0x%x "
3045                    "create_disposition = 0x%x create_options=0x%x "
3046                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3047                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3048                    access_mask, share_access, create_disposition,
3049                    create_options, (unsigned int)unx_mode, oplock_request,
3050                    (unsigned int)private_flags));
3051
3052         if (req == NULL) {
3053                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3054                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3055         } else {
3056                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3057                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3058         }
3059
3060         /*
3061          * Only non-internal opens can be deferred at all
3062          */
3063
3064         if (req) {
3065                 struct deferred_open_record *open_rec;
3066                 if (get_deferred_open_message_state(req,
3067                                 &request_time,
3068                                 &open_rec)) {
3069                         /* Remember the absolute time of the original
3070                            request with this mid. We'll use it later to
3071                            see if this has timed out. */
3072
3073                         /* If it was an async create retry, the file
3074                            didn't exist. */
3075
3076                         if (is_deferred_open_async(open_rec)) {
3077                                 SET_STAT_INVALID(smb_fname->st);
3078                                 file_existed = false;
3079                         }
3080
3081                         /* Ensure we don't reprocess this message. */
3082                         remove_deferred_open_message_smb(req->xconn, req->mid);
3083
3084                         first_open_attempt = false;
3085                 }
3086         }
3087
3088         if (!posix_open) {
3089                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3090                 if (file_existed) {
3091                         /*
3092                          * Only use strored DOS attributes for checks
3093                          * against requested attributes (below via
3094                          * open_match_attributes()), cf bug #11992
3095                          * for details. -slow
3096                          */
3097                         uint32_t attr = 0;
3098
3099                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3100                         if (NT_STATUS_IS_OK(status)) {
3101                                 existing_dos_attributes = attr;
3102                         }
3103                 }
3104         }
3105
3106         /* ignore any oplock requests if oplocks are disabled */
3107         if (!lp_oplocks(SNUM(conn)) ||
3108             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3109                 /* Mask off everything except the private Samba bits. */
3110                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3111         }
3112
3113         /* this is for OS/2 long file names - say we don't support them */
3114         if (req != NULL && !req->posix_pathnames &&
3115                         strstr(smb_fname->base_name,".+,;=[].")) {
3116                 /* OS/2 Workplace shell fix may be main code stream in a later
3117                  * release. */
3118                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3119                          "supported.\n"));
3120                 if (use_nt_status()) {
3121                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3122                 }
3123                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3124         }
3125
3126         switch( create_disposition ) {
3127                 case FILE_OPEN:
3128                         /* If file exists open. If file doesn't exist error. */
3129                         if (!file_existed) {
3130                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
3131                                          "requested for file %s and file "
3132                                          "doesn't exist.\n",
3133                                          smb_fname_str_dbg(smb_fname)));
3134                                 errno = ENOENT;
3135                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3136                         }
3137                         break;
3138
3139                 case FILE_OVERWRITE:
3140                         /* If file exists overwrite. If file doesn't exist
3141                          * error. */
3142                         if (!file_existed) {
3143                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3144                                          "requested for file %s and file "
3145                                          "doesn't exist.\n",
3146                                          smb_fname_str_dbg(smb_fname) ));
3147                                 errno = ENOENT;
3148                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3149                         }
3150                         break;
3151
3152                 case FILE_CREATE:
3153                         /* If file exists error. If file doesn't exist
3154                          * create. */
3155                         if (file_existed) {
3156                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3157                                          "requested for file %s and file "
3158                                          "already exists.\n",
3159                                          smb_fname_str_dbg(smb_fname)));
3160                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3161                                         errno = EISDIR;
3162                                 } else {
3163                                         errno = EEXIST;
3164                                 }
3165                                 return map_nt_error_from_unix(errno);
3166                         }
3167                         break;
3168
3169                 case FILE_SUPERSEDE:
3170                 case FILE_OVERWRITE_IF:
3171                 case FILE_OPEN_IF:
3172                         break;
3173                 default:
3174                         return NT_STATUS_INVALID_PARAMETER;
3175         }
3176
3177         flags2 = disposition_to_open_flags(create_disposition);
3178
3179         /* We only care about matching attributes on file exists and
3180          * overwrite. */
3181
3182         if (!posix_open && file_existed &&
3183             ((create_disposition == FILE_OVERWRITE) ||
3184              (create_disposition == FILE_OVERWRITE_IF))) {
3185                 if (!open_match_attributes(conn, existing_dos_attributes,
3186                                            new_dos_attributes,
3187                                            unx_mode, &new_unx_mode)) {
3188                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3189                                  "for file %s (%x %x) (0%o, 0%o)\n",
3190                                  smb_fname_str_dbg(smb_fname),
3191                                  existing_dos_attributes,
3192                                  new_dos_attributes,
3193                                  (unsigned int)smb_fname->st.st_ex_mode,
3194                                  (unsigned int)unx_mode ));
3195                         errno = EACCES;
3196                         return NT_STATUS_ACCESS_DENIED;
3197                 }
3198         }
3199
3200         status = smbd_calculate_access_mask(conn, smb_fname,
3201                                         false,
3202                                         access_mask,
3203                                         &access_mask);
3204         if (!NT_STATUS_IS_OK(status)) {
3205                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3206                         "on file %s returned %s\n",
3207                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3208                 return status;
3209         }
3210
3211         open_access_mask = access_mask;
3212
3213         if (flags2 & O_TRUNC) {
3214                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3215         }
3216
3217         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3218                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3219                     access_mask));
3220
3221         /*
3222          * Note that we ignore the append flag as append does not
3223          * mean the same thing under DOS and Unix.
3224          */
3225
3226         flags = calculate_open_access_flags(access_mask, private_flags);
3227
3228         /*
3229          * Currently we only look at FILE_WRITE_THROUGH for create options.
3230          */
3231
3232 #if defined(O_SYNC)
3233         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3234                 flags2 |= O_SYNC;
3235         }
3236 #endif /* O_SYNC */
3237
3238         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3239                 flags2 |= O_APPEND;
3240         }
3241
3242         if (!posix_open && !CAN_WRITE(conn)) {
3243                 /*
3244                  * We should really return a permission denied error if either
3245                  * O_CREAT or O_TRUNC are set, but for compatibility with
3246                  * older versions of Samba we just AND them out.
3247                  */
3248                 flags2 &= ~(O_CREAT|O_TRUNC);
3249         }
3250
3251         if (lp_kernel_oplocks(SNUM(conn))) {
3252                 /*
3253                  * With kernel oplocks the open breaking an oplock
3254                  * blocks until the oplock holder has given up the
3255                  * oplock or closed the file. We prevent this by always
3256                  * trying to open the file with O_NONBLOCK (see "man
3257                  * fcntl" on Linux).
3258                  *
3259                  * If a process that doesn't use the smbd open files
3260                  * database or communication methods holds a kernel
3261                  * oplock we must periodically poll for available open
3262                  * using O_NONBLOCK.
3263                  */
3264                 flags2 |= O_NONBLOCK;
3265         }
3266
3267         /*
3268          * Ensure we can't write on a read-only share or file.
3269          */
3270
3271         if (flags != O_RDONLY && file_existed &&
3272             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3273                 DEBUG(5,("open_file_ntcreate: write access requested for "
3274                          "file %s on read only %s\n",
3275                          smb_fname_str_dbg(smb_fname),
3276                          !CAN_WRITE(conn) ? "share" : "file" ));
3277                 errno = EACCES;
3278                 return NT_STATUS_ACCESS_DENIED;
3279         }
3280
3281         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3282         fsp->share_access = share_access;
3283         fsp->fh->private_options = private_flags;
3284         fsp->access_mask = open_access_mask; /* We change this to the
3285                                               * requested access_mask after
3286                                               * the open is done. */
3287         if (posix_open) {
3288                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3289         }
3290
3291         if (timeval_is_zero(&request_time)) {
3292                 request_time = fsp->open_time;
3293         }
3294
3295         if ((create_options & FILE_DELETE_ON_CLOSE) &&
3296                         (flags2 & O_CREAT) &&
3297                         !file_existed) {
3298                 /* Delete on close semantics for new files. */
3299                 status = can_set_delete_on_close(fsp,
3300                                                 new_dos_attributes);
3301                 if (!NT_STATUS_IS_OK(status)) {
3302                         fd_close(fsp);
3303                         return status;
3304                 }
3305         }
3306
3307         /*
3308          * Ensure we pay attention to default ACLs on directories if required.
3309          */
3310
3311         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3312             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3313                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3314         }
3315
3316         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3317                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3318                  (unsigned int)flags, (unsigned int)flags2,
3319                  (unsigned int)unx_mode, (unsigned int)access_mask,
3320                  (unsigned int)open_access_mask));
3321
3322         fsp_open = open_file(fsp, conn, req, parent_dir,
3323                              flags|flags2, unx_mode, access_mask,
3324                              open_access_mask, &new_file_created);
3325
3326         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3327                 bool delay;
3328
3329                 /*
3330                  * This handles the kernel oplock case:
3331                  *
3332                  * the file has an active kernel oplock and the open() returned
3333                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3334                  *
3335                  * "Samba locking.tdb oplocks" are handled below after acquiring
3336                  * the sharemode lock with get_share_mode_lock().
3337                  */
3338                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3339                         DEBUG(10, ("FIFO busy\n"));
3340                         return NT_STATUS_NETWORK_BUSY;
3341                 }
3342                 if (req == NULL) {
3343                         DEBUG(10, ("Internal open busy\n"));
3344                         return NT_STATUS_NETWORK_BUSY;
3345                 }
3346
3347                 /*
3348                  * From here on we assume this is an oplock break triggered
3349                  */
3350
3351                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3352                 if (lck == NULL) {
3353                         /*
3354                          * No oplock from Samba around. Set up a poll every 1
3355                          * second to retry a non-blocking open until the time
3356                          * expires.
3357                          */
3358                         setup_kernel_oplock_poll_open(request_time,
3359                                                 req,
3360                                                 fsp->file_id);
3361                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3362                                 "Retrying with poll\n");
3363                         return NT_STATUS_SHARING_VIOLATION;
3364                 }
3365
3366                 if (!validate_oplock_types(lck)) {
3367                         smb_panic("validate_oplock_types failed");
3368                 }
3369
3370                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3371                                          create_disposition,
3372                                          first_open_attempt);
3373                 if (delay) {
3374                         schedule_defer_open(lck, fsp->file_id, request_time,
3375                                             req);
3376                         TALLOC_FREE(lck);
3377                         DEBUG(10, ("Sent oplock break request to kernel "
3378                                    "oplock holder\n"));
3379                         return NT_STATUS_SHARING_VIOLATION;
3380                 }
3381
3382                 /*
3383                  * No oplock from Samba around. Set up a poll every 1
3384                  * second to retry a non-blocking open until the time
3385                  * expires.
3386                  */
3387                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3388
3389                 TALLOC_FREE(lck);
3390                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3391                         "Retrying with poll\n");
3392                 return NT_STATUS_SHARING_VIOLATION;
3393         }
3394
3395         if (!NT_STATUS_IS_OK(fsp_open)) {
3396                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3397                         schedule_async_open(request_time, req);
3398                 }
3399                 return fsp_open;
3400         }
3401
3402         if (new_file_created) {
3403                 /*
3404                  * As we atomically create using O_CREAT|O_EXCL,
3405                  * then if new_file_created is true, then
3406                  * file_existed *MUST* have been false (even
3407                  * if the file was previously detected as being
3408                  * there).
3409                  */
3410                 file_existed = false;
3411         }
3412
3413         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3414                 /*
3415                  * The file did exist, but some other (local or NFS)
3416                  * process either renamed/unlinked and re-created the
3417                  * file with different dev/ino after we walked the path,
3418                  * but before we did the open. We could retry the
3419                  * open but it's a rare enough case it's easier to
3420                  * just fail the open to prevent creating any problems
3421                  * in the open file db having the wrong dev/ino key.
3422                  */
3423                 fd_close(fsp);
3424                 DBG_WARNING("file %s - dev/ino mismatch. "
3425                             "Old (dev=%ju, ino=%ju). "
3426                             "New (dev=%ju, ino=%ju). Failing open "
3427                             "with NT_STATUS_ACCESS_DENIED.\n",
3428                             smb_fname_str_dbg(smb_fname),
3429                             (uintmax_t)saved_stat.st_ex_dev,
3430                             (uintmax_t)saved_stat.st_ex_ino,
3431                             (uintmax_t)smb_fname->st.st_ex_dev,
3432                             (uintmax_t)smb_fname->st.st_ex_ino);
3433                 return NT_STATUS_ACCESS_DENIED;
3434         }
3435
3436         old_write_time = smb_fname->st.st_ex_mtime;
3437
3438         /*
3439          * Deal with the race condition where two smbd's detect the
3440          * file doesn't exist and do the create at the same time. One
3441          * of them will win and set a share mode, the other (ie. this
3442          * one) should check if the requested share mode for this
3443          * create is allowed.
3444          */
3445
3446         /*
3447          * Now the file exists and fsp is successfully opened,
3448          * fsp->dev and fsp->inode are valid and should replace the
3449          * dev=0,inode=0 from a non existent file. Spotted by
3450          * Nadav Danieli <nadavd@exanet.com>. JRA.
3451          */
3452
3453         id = fsp->file_id;
3454
3455         lck = get_share_mode_lock(talloc_tos(), id,
3456                                   conn->connectpath,
3457                                   smb_fname, &old_write_time);
3458
3459         if (lck == NULL) {
3460                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3461                           "mode lock for %s\n",
3462                           smb_fname_str_dbg(smb_fname)));
3463                 fd_close(fsp);
3464                 return NT_STATUS_SHARING_VIOLATION;
3465         }
3466
3467         /* Get the types we need to examine. */
3468         if (!validate_oplock_types(lck)) {
3469                 smb_panic("validate_oplock_types failed");
3470         }
3471
3472         if (has_delete_on_close(lck, fsp->name_hash)) {
3473                 TALLOC_FREE(lck);
3474                 fd_close(fsp);
3475                 return NT_STATUS_DELETE_PENDING;
3476         }
3477
3478         status = open_mode_check(conn, lck,
3479                                  access_mask, share_access);
3480
3481         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3482             (lck->data->num_share_modes > 0)) {
3483                 /*
3484                  * This comes from ancient times out of open_mode_check. I
3485                  * have no clue whether this is still necessary. I can't think
3486                  * of a case where this would actually matter further down in
3487                  * this function. I leave it here for further investigation
3488                  * :-)
3489                  */
3490                 file_existed = true;
3491         }
3492
3493         if (req != NULL) {
3494                 /*
3495                  * Handle oplocks, deferring the request if delay_for_oplock()
3496                  * triggered a break message and we have to wait for the break
3497                  * response.
3498                  */
3499                 bool delay;
3500                 bool sharing_violation = NT_STATUS_EQUAL(
3501                         status, NT_STATUS_SHARING_VIOLATION);
3502
3503                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3504                                          sharing_violation,
3505                                          create_disposition,
3506                                          first_open_attempt);
3507                 if (delay) {
3508                         schedule_defer_open(lck, fsp->file_id,
3509                                             request_time, req);
3510                         TALLOC_FREE(lck);
3511                         fd_close(fsp);
3512                         return NT_STATUS_SHARING_VIOLATION;
3513                 }
3514         }
3515
3516         if (!NT_STATUS_IS_OK(status)) {
3517                 uint32_t can_access_mask;
3518                 bool can_access = True;
3519
3520                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3521
3522                 /* Check if this can be done with the deny_dos and fcb
3523                  * calls. */
3524                 if (private_flags &
3525                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3526                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3527                         if (req == NULL) {
3528                                 DEBUG(0, ("DOS open without an SMB "
3529                                           "request!\n"));
3530                                 TALLOC_FREE(lck);
3531                                 fd_close(fsp);
3532                                 return NT_STATUS_INTERNAL_ERROR;
3533                         }
3534
3535                         /* Use the client requested access mask here,
3536                          * not the one we open with. */
3537                         status = fcb_or_dos_open(req,
3538                                                  conn,
3539                                                  fsp,
3540                                                  smb_fname,
3541                                                  id,
3542                                                  req->smbpid,
3543                                                  req->vuid,
3544                                                  access_mask,
3545                                                  share_access,
3546                                                  create_options);
3547
3548                         if (NT_STATUS_IS_OK(status)) {
3549                                 TALLOC_FREE(lck);
3550                                 if (pinfo) {
3551                                         *pinfo = FILE_WAS_OPENED;
3552                                 }
3553                                 return NT_STATUS_OK;
3554                         }
3555                 }
3556
3557                 /*
3558                  * This next line is a subtlety we need for
3559                  * MS-Access. If a file open will fail due to share
3560                  * permissions and also for security (access) reasons,
3561                  * we need to return the access failed error, not the
3562                  * share error. We can't open the file due to kernel
3563                  * oplock deadlock (it's possible we failed above on
3564                  * the open_mode_check()) so use a userspace check.
3565                  */
3566
3567                 if (flags & O_RDWR) {
3568                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3569                 } else if (flags & O_WRONLY) {
3570                         can_access_mask = FILE_WRITE_DATA;
3571                 } else {
3572                         can_access_mask = FILE_READ_DATA;
3573                 }
3574
3575                 if (((can_access_mask & FILE_WRITE_DATA) &&
3576                      !CAN_WRITE(conn)) ||
3577                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3578                                                               smb_fname,
3579                                                               false,
3580                                                               can_access_mask))) {
3581                         can_access = False;
3582                 }
3583
3584                 /*
3585                  * If we're returning a share violation, ensure we
3586                  * cope with the braindead 1 second delay (SMB1 only).
3587                  */
3588
3589                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3590                     !conn->sconn->using_smb2 &&
3591                     lp_defer_sharing_violations()) {
3592                         struct timeval timeout;
3593                         int timeout_usecs;
3594
3595                         /* this is a hack to speed up torture tests
3596                            in 'make test' */
3597                         timeout_usecs = lp_parm_int(SNUM(conn),
3598                                                     "smbd","sharedelay",
3599                                                     SHARING_VIOLATION_USEC_WAIT);
3600
3601                         /* This is a relative time, added to the absolute
3602                            request_time value to get the absolute timeout time.
3603                            Note that if this is the second or greater time we enter
3604                            this codepath for this particular request mid then
3605                            request_time is left as the absolute time of the *first*
3606                            time this request mid was processed. This is what allows
3607                            the request to eventually time out. */
3608
3609                         timeout = timeval_set(0, timeout_usecs);
3610
3611                         if (!request_timed_out(request_time, timeout)) {
3612                                 defer_open(lck, request_time, timeout, req,
3613                                            false, id);
3614                         }
3615                 }
3616
3617                 TALLOC_FREE(lck);
3618                 fd_close(fsp);
3619                 if (can_access) {
3620                         /*
3621                          * We have detected a sharing violation here
3622                          * so return the correct error code
3623                          */
3624                         status = NT_STATUS_SHARING_VIOLATION;
3625                 } else {
3626                         status = NT_STATUS_ACCESS_DENIED;
3627                 }
3628                 return status;
3629         }
3630
3631         /* Should we atomically (to the client at least) truncate ? */
3632         if ((!new_file_created) &&
3633             (flags2 & O_TRUNC) &&
3634             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3635                 int ret;
3636
3637                 ret = vfs_set_filelen(fsp, 0);
3638                 if (ret != 0) {
3639                         status = map_nt_error_from_unix(errno);
3640                         TALLOC_FREE(lck);
3641                         fd_close(fsp);
3642                         return status;
3643                 }
3644         }
3645
3646         /*
3647          * We have the share entry *locked*.....
3648          */
3649
3650         /* Delete streams if create_disposition requires it */
3651         if (!new_file_created && clear_ads(create_disposition) &&
3652             !is_ntfs_stream_smb_fname(smb_fname)) {
3653                 status = delete_all_streams(conn, smb_fname);
3654                 if (!NT_STATUS_IS_OK(status)) {
3655                         TALLOC_FREE(lck);
3656                         fd_close(fsp);
3657                         return status;
3658                 }
3659         }
3660
3661         /* note that we ignore failure for the following. It is
3662            basically a hack for NFS, and NFS will never set one of
3663            these only read them. Nobody but Samba can ever set a deny
3664            mode and we have already checked our more authoritative
3665            locking database for permission to set this deny mode. If
3666            the kernel refuses the operations then the kernel is wrong.
3667            note that GPFS supports it as well - jmcd */
3668
3669         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3670                 int ret_flock;
3671                 /*
3672                  * Beware: streams implementing VFS modules may
3673                  * implement streams in a way that fsp will have the
3674                  * basefile open in the fsp fd, so lacking a distinct
3675                  * fd for the stream kernel_flock will apply on the
3676                  * basefile which is wrong. The actual check is
3677                  * deffered to the VFS module implementing the
3678                  * kernel_flock call.
3679                  */
3680                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3681                 if(ret_flock == -1 ){
3682
3683                         TALLOC_FREE(lck);
3684                         fd_close(fsp);
3685
3686                         return NT_STATUS_SHARING_VIOLATION;
3687                 }
3688
3689                 fsp->kernel_share_modes_taken = true;
3690         }
3691
3692         /*
3693          * At this point onwards, we can guarantee that the share entry
3694          * is locked, whether we created the file or not, and that the
3695          * deny mode is compatible with all current opens.
3696          */
3697
3698         /*
3699          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3700          * but we don't have to store this - just ignore it on access check.
3701          */
3702         if (conn->sconn->using_smb2) {
3703                 /*
3704                  * SMB2 doesn't return it (according to Microsoft tests).
3705                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3706                  * File created with access = 0x7 (Read, Write, Delete)
3707                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3708                  */
3709                 fsp->access_mask = access_mask;
3710         } else {
3711                 /* But SMB1 does. */
3712                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3713         }
3714
3715         if (file_existed) {
3716                 /*
3717                  * stat opens on existing files don't get oplocks.
3718                  * They can get leases.
3719                  *
3720                  * Note that we check for stat open on the *open_access_mask*,
3721                  * i.e. the access mask we actually used to do the open,
3722                  * not the one the client asked for (which is in
3723                  * fsp->access_mask). This is due to the fact that
3724                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3725                  * which adds FILE_WRITE_DATA to open_access_mask.
3726                  */
3727                 if (is_stat_open(open_access_mask) && lease == NULL) {
3728                         oplock_request = NO_OPLOCK;
3729                 }
3730         }
3731
3732         if (new_file_created) {
3733                 info = FILE_WAS_CREATED;
3734         } else {
3735                 if (flags2 & O_TRUNC) {
3736                         info = FILE_WAS_OVERWRITTEN;
3737                 } else {
3738                         info = FILE_WAS_OPENED;
3739                 }
3740         }
3741
3742         if (pinfo) {
3743                 *pinfo = info;
3744         }
3745
3746         /*
3747          * Setup the oplock info in both the shared memory and
3748          * file structs.
3749          */
3750         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3751         if (!NT_STATUS_IS_OK(status)) {
3752                 TALLOC_FREE(lck);
3753                 fd_close(fsp);
3754                 return status;
3755         }
3756
3757         /* Handle strange delete on close create semantics. */
3758         if (create_options & FILE_DELETE_ON_CLOSE) {
3759                 if (!new_file_created) {
3760                         status = can_set_delete_on_close(fsp,
3761                                          existing_dos_attributes);
3762
3763                         if (!NT_STATUS_IS_OK(status)) {
3764                                 /* Remember to delete the mode we just added. */
3765                                 del_share_mode(lck, fsp);
3766                                 TALLOC_FREE(lck);
3767                                 fd_close(fsp);
3768                                 return status;
3769                         }
3770                 }
3771                 /* Note that here we set the *initial* delete on close flag,
3772                    not the regular one. The magic gets handled in close. */
3773                 fsp->initial_delete_on_close = True;
3774         }
3775
3776         if (info != FILE_WAS_OPENED) {
3777                 /* Overwritten files should be initially set as archive */
3778                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3779                     lp_store_dos_attributes(SNUM(conn))) {
3780                         if (!posix_open) {
3781                                 if (file_set_dosmode(conn, smb_fname,
3782                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3783                                             parent_dir, true) == 0) {
3784                                         unx_mode = smb_fname->st.st_ex_mode;
3785                                 }
3786                         }
3787                 }
3788         }
3789
3790         /* Determine sparse flag. */
3791         if (posix_open) {
3792                 /* POSIX opens are sparse by default. */
3793                 fsp->is_sparse = true;
3794         } else {
3795                 fsp->is_sparse = (file_existed &&
3796                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3797         }
3798
3799         /*
3800          * Take care of inherited ACLs on created files - if default ACL not
3801          * selected.
3802          */
3803
3804         if (!posix_open && new_file_created && !def_acl) {
3805                 if (unx_mode != smb_fname->st.st_ex_mode) {
3806                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3807                         if (ret == -1) {
3808                                 DBG_INFO("failed to reset "
3809                                   "attributes of file %s to 0%o\n",
3810                                   smb_fname_str_dbg(smb_fname),
3811                                   (unsigned int)unx_mode);
3812                         }
3813                 }
3814
3815         } else if (new_unx_mode) {
3816                 /*
3817                  * We only get here in the case of:
3818                  *
3819                  * a). Not a POSIX open.
3820                  * b). File already existed.
3821                  * c). File was overwritten.
3822                  * d). Requested DOS attributes didn't match
3823                  *     the DOS attributes on the existing file.
3824                  *
3825                  * In that case new_unx_mode has been set
3826                  * equal to the calculated mode (including
3827                  * possible inheritance of the mode from the
3828                  * containing directory).
3829                  *
3830                  * Note this mode was calculated with the
3831                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3832                  * so the mode change here is suitable for
3833                  * an overwritten file.
3834                  */
3835
3836                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3837                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3838                         if (ret == -1) {
3839                                 DBG_INFO("failed to reset "
3840                                   "attributes of file %s to 0%o\n",
3841                                   smb_fname_str_dbg(smb_fname),
3842                                   (unsigned int)new_unx_mode);
3843                         }
3844                 }
3845         }
3846
3847         {
3848                 /*
3849                  * Deal with other opens having a modified write time.
3850                  */
3851                 struct timespec write_time = get_share_mode_write_time(lck);
3852
3853                 if (!null_timespec(write_time)) {
3854                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3855                 }
3856         }
3857
3858         TALLOC_FREE(lck);
3859
3860         return NT_STATUS_OK;
3861 }
3862
3863 static NTSTATUS mkdir_internal(connection_struct *conn,
3864                                struct smb_filename *smb_dname,
3865                                uint32_t file_attributes)
3866 {
3867         mode_t mode;
3868         char *parent_dir = NULL;
3869         NTSTATUS status;
3870         bool posix_open = false;
3871         bool need_re_stat = false;
3872         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3873
3874         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3875                 DEBUG(5,("mkdir_internal: failing share access "
3876                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3877                 return NT_STATUS_ACCESS_DENIED;
3878         }
3879
3880         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3881                             NULL)) {
3882                 return NT_STATUS_NO_MEMORY;
3883         }
3884
3885         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3886                 posix_open = true;
3887                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3888         } else {
3889                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3890         }
3891
3892         status = check_parent_access(conn,
3893                                         smb_dname,
3894                                         access_mask);
3895         if(!NT_STATUS_IS_OK(status)) {
3896                 DEBUG(5,("mkdir_internal: check_parent_access "
3897                         "on directory %s for path %s returned %s\n",
3898                         parent_dir,
3899                         smb_dname->base_name,
3900                         nt_errstr(status) ));
3901                 return status;
3902         }
3903
3904         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3905                 return map_nt_error_from_unix(errno);
3906         }
3907
3908         /* Ensure we're checking for a symlink here.... */
3909         /* We don't want to get caught by a symlink racer. */
3910
3911         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3912                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3913                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3914                 return map_nt_error_from_unix(errno);
3915         }
3916
3917         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3918                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3919                           smb_fname_str_dbg(smb_dname)));
3920                 return NT_STATUS_NOT_A_DIRECTORY;
3921         }
3922
3923         if (lp_store_dos_attributes(SNUM(conn))) {
3924                 if (!posix_open) {
3925                         file_set_dosmode(conn, smb_dname,
3926                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3927                                          parent_dir, true);
3928                 }
3929         }
3930
3931         if (lp_inherit_permissions(SNUM(conn))) {
3932                 inherit_access_posix_acl(conn, parent_dir,
3933                                          smb_dname, mode);
3934                 need_re_stat = true;
3935         }
3936
3937         if (!posix_open) {
3938                 /*
3939                  * Check if high bits should have been set,
3940                  * then (if bits are missing): add them.
3941                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3942                  * dir.
3943                  */
3944                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3945                     (mode & ~smb_dname->st.st_ex_mode)) {
3946                         SMB_VFS_CHMOD(conn, smb_dname,
3947                                       (smb_dname->st.st_ex_mode |
3948                                           (mode & ~smb_dname->st.st_ex_mode)));
3949                         need_re_stat = true;
3950                 }
3951         }
3952
3953         /* Change the owner if required. */
3954         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
3955                 change_dir_owner_to_parent(conn, parent_dir,
3956                                            smb_dname,
3957                                            &smb_dname->st);
3958                 need_re_stat = true;
3959         }
3960
3961         if (need_re_stat) {
3962                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3963                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3964                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3965                         return map_nt_error_from_unix(errno);
3966                 }
3967         }
3968
3969         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
3970                      smb_dname->base_name);
3971
3972         return NT_STATUS_OK;
3973 }
3974
3975 /****************************************************************************
3976  Open a directory from an NT SMB call.
3977 ****************************************************************************/
3978
3979 static NTSTATUS open_directory(connection_struct *conn,
3980                                struct smb_request *req,
3981                                struct smb_filename *smb_dname,
3982                                uint32_t access_mask,
3983                                uint32_t share_access,
3984                                uint32_t create_disposition,
3985                                uint32_t create_options,
3986                                uint32_t file_attributes,
3987                                int *pinfo,
3988                                files_struct **result)
3989 {
3990         files_struct *fsp = NULL;
3991         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
3992         struct share_mode_lock *lck = NULL;
3993         NTSTATUS status;
3994         struct timespec mtimespec;
3995         int info = 0;
3996         bool ok;
3997
3998         if (is_ntfs_stream_smb_fname(smb_dname)) {
3999                 DEBUG(2, ("open_directory: %s is a stream name!\n",
4000                           smb_fname_str_dbg(smb_dname)));
4001                 return NT_STATUS_NOT_A_DIRECTORY;
4002         }
4003
4004         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
4005                 /* Ensure we have a directory attribute. */
4006                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
4007         }
4008
4009         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
4010                  "share_access = 0x%x create_options = 0x%x, "
4011                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
4012                  smb_fname_str_dbg(smb_dname),
4013                  (unsigned int)access_mask,
4014                  (unsigned int)share_access,
4015                  (unsigned int)create_options,
4016                  (unsigned int)create_disposition,
4017                  (unsigned int)file_attributes));
4018
4019         status = smbd_calculate_access_mask(conn, smb_dname, false,
4020                                             access_mask, &access_mask);
4021         if (!NT_STATUS_IS_OK(status)) {
4022                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
4023                         "on file %s returned %s\n",
4024                         smb_fname_str_dbg(smb_dname),
4025                         nt_errstr(status)));
4026                 return status;
4027         }
4028
4029         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4030                         !security_token_has_privilege(get_current_nttok(conn),
4031                                         SEC_PRIV_SECURITY)) {
4032                 DEBUG(10, ("open_directory: open on %s "
4033                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4034                         smb_fname_str_dbg(smb_dname)));
4035                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4036         }
4037
4038         switch( create_disposition ) {
4039                 case FILE_OPEN:
4040
4041                         if (!dir_existed) {
4042                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4043                         }
4044
4045                         info = FILE_WAS_OPENED;
4046                         break;
4047
4048                 case FILE_CREATE:
4049
4050                         /* If directory exists error. If directory doesn't
4051                          * exist create. */
4052
4053                         if (dir_existed) {
4054                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4055                                 DEBUG(2, ("open_directory: unable to create "
4056                                           "%s. Error was %s\n",
4057                                           smb_fname_str_dbg(smb_dname),
4058                                           nt_errstr(status)));
4059                                 return status;
4060                         }
4061
4062                         status = mkdir_internal(conn, smb_dname,
4063                                                 file_attributes);
4064
4065                         if (!NT_STATUS_IS_OK(status)) {
4066                                 DEBUG(2, ("open_directory: unable to create "
4067                                           "%s. Error was %s\n",
4068                                           smb_fname_str_dbg(smb_dname),
4069                                           nt_errstr(status)));
4070                                 return status;
4071                         }
4072
4073                         info = FILE_WAS_CREATED;
4074                         break;
4075
4076                 case FILE_OPEN_IF:
4077                         /*
4078                          * If directory exists open. If directory doesn't
4079                          * exist create.
4080                          */
4081
4082                         if (dir_existed) {
4083                                 status = NT_STATUS_OK;
4084                                 info = FILE_WAS_OPENED;
4085                         } else {
4086                                 status = mkdir_internal(conn, smb_dname,
4087                                                 file_attributes);
4088
4089                                 if (NT_STATUS_IS_OK(status)) {
4090                                         info = FILE_WAS_CREATED;
4091                                 } else {
4092                                         /* Cope with create race. */
4093                                         if (!NT_STATUS_EQUAL(status,
4094                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4095                                                 DEBUG(2, ("open_directory: unable to create "
4096                                                         "%s. Error was %s\n",
4097                                                         smb_fname_str_dbg(smb_dname),
4098                                                         nt_errstr(status)));
4099                                                 return status;
4100                                         }
4101
4102                                         /*
4103                                          * If mkdir_internal() returned
4104                                          * NT_STATUS_OBJECT_NAME_COLLISION
4105                                          * we still must lstat the path.
4106                                          */
4107
4108                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4109                                                         == -1) {
4110                                                 DEBUG(2, ("Could not stat "
4111                                                         "directory '%s' just "
4112                                                         "opened: %s\n",
4113                                                         smb_fname_str_dbg(
4114                                                                 smb_dname),
4115                                                         strerror(errno)));
4116                                                 return map_nt_error_from_unix(
4117                                                                 errno);
4118                                         }
4119
4120                                         info = FILE_WAS_OPENED;
4121                                 }
4122                         }
4123
4124                         break;
4125
4126                 case FILE_SUPERSEDE:
4127                 case FILE_OVERWRITE:
4128                 case FILE_OVERWRITE_IF:
4129                 default:
4130                         DEBUG(5,("open_directory: invalid create_disposition "
4131                                  "0x%x for directory %s\n",
4132                                  (unsigned int)create_disposition,
4133                                  smb_fname_str_dbg(smb_dname)));
4134                         return NT_STATUS_INVALID_PARAMETER;
4135         }
4136
4137         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4138                 DEBUG(5,("open_directory: %s is not a directory !\n",
4139                          smb_fname_str_dbg(smb_dname)));
4140                 return NT_STATUS_NOT_A_DIRECTORY;
4141         }
4142
4143         if (info == FILE_WAS_OPENED) {
4144                 status = smbd_check_access_rights(conn,
4145                                                 smb_dname,
4146                                                 false,
4147                                                 access_mask);
4148                 if (!NT_STATUS_IS_OK(status)) {
4149                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4150                                 "file %s failed with %s\n",
4151                                 smb_fname_str_dbg(smb_dname),
4152                                 nt_errstr(status)));
4153                         return status;
4154                 }
4155         }
4156
4157         status = file_new(req, conn, &fsp);
4158         if(!NT_STATUS_IS_OK(status)) {
4159                 return status;
4160         }
4161
4162         /*
4163          * Setup the files_struct for it.
4164          */
4165
4166         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4167         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4168         fsp->file_pid = req ? req->smbpid : 0;
4169         fsp->can_lock = False;
4170         fsp->can_read = False;
4171         fsp->can_write = False;
4172
4173         fsp->share_access = share_access;
4174         fsp->fh->private_options = 0;
4175         /*
4176          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4177          */
4178         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4179         fsp->print_file = NULL;
4180         fsp->modified = False;
4181         fsp->oplock_type = NO_OPLOCK;
4182         fsp->sent_oplock_break = NO_BREAK_SENT;
4183         fsp->is_directory = True;
4184         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4185                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4186         }
4187         status = fsp_set_smb_fname(fsp, smb_dname);
4188         if (!NT_STATUS_IS_OK(status)) {
4189                 file_free(req, fsp);
4190                 return status;
4191         }
4192
4193         /* Don't store old timestamps for directory
4194            handles in the internal database. We don't
4195            update them in there if new objects
4196            are creaded in the directory. Currently
4197            we only update timestamps on file writes.
4198            See bug #9870.
4199         */
4200         ZERO_STRUCT(mtimespec);
4201
4202         if (access_mask & (FILE_LIST_DIRECTORY|
4203                            FILE_ADD_FILE|
4204                            FILE_ADD_SUBDIRECTORY|
4205                            FILE_TRAVERSE|
4206                            DELETE_ACCESS|
4207                            FILE_DELETE_CHILD)) {
4208 #ifdef O_DIRECTORY
4209                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4210 #else
4211                 /* POSIX allows us to open a directory with O_RDONLY. */
4212                 status = fd_open(conn, fsp, O_RDONLY, 0);
4213 #endif
4214                 if (!NT_STATUS_IS_OK(status)) {
4215                         DEBUG(5, ("open_directory: Could not open fd for "
4216                                 "%s (%s)\n",
4217                                 smb_fname_str_dbg(smb_dname),
4218                                 nt_errstr(status)));
4219                         file_free(req, fsp);
4220                         return status;
4221                 }
4222         } else {
4223                 fsp->fh->fd = -1;
4224                 DEBUG(10, ("Not opening Directory %s\n",
4225                         smb_fname_str_dbg(smb_dname)));
4226         }
4227
4228         status = vfs_stat_fsp(fsp);
4229         if (!NT_STATUS_IS_OK(status)) {
4230                 fd_close(fsp);
4231                 file_free(req, fsp);
4232                 return status;
4233         }
4234
4235         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4236                 DEBUG(5,("open_directory: %s is not a directory !\n",
4237                          smb_fname_str_dbg(smb_dname)));
4238                 fd_close(fsp);
4239                 file_free(req, fsp);
4240                 return NT_STATUS_NOT_A_DIRECTORY;
4241         }
4242
4243         /* Ensure there was no race condition.  We need to check
4244          * dev/inode but not permissions, as these can change
4245          * legitimately */
4246         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4247                 DEBUG(5,("open_directory: stat struct differs for "
4248                         "directory %s.\n",
4249                         smb_fname_str_dbg(smb_dname)));
4250                 fd_close(fsp);
4251                 file_free(req, fsp);
4252                 return NT_STATUS_ACCESS_DENIED;
4253         }
4254
4255         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4256                                   conn->connectpath, smb_dname,
4257                                   &mtimespec);
4258
4259         if (lck == NULL) {
4260                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4261                           "%s\n", smb_fname_str_dbg(smb_dname)));
4262                 fd_close(fsp);
4263                 file_free(req, fsp);
4264                 return NT_STATUS_SHARING_VIOLATION;
4265         }
4266
4267         if (has_delete_on_close(lck, fsp->name_hash)) {
4268                 TALLOC_FREE(lck);
4269                 fd_close(fsp);
4270                 file_free(req, fsp);
4271                 return NT_STATUS_DELETE_PENDING;
4272         }
4273
4274         status = open_mode_check(conn, lck,
4275                                  access_mask, share_access);
4276
4277         if (!NT_STATUS_IS_OK(status)) {
4278                 TALLOC_FREE(lck);
4279                 fd_close(fsp);
4280                 file_free(req, fsp);
4281                 return status;
4282         }
4283
4284         ok = set_share_mode(lck, fsp, get_current_uid(conn),
4285                             req ? req->mid : 0, NO_OPLOCK,
4286                             UINT32_MAX);
4287         if (!ok) {
4288                 TALLOC_FREE(lck);
4289                 fd_close(fsp);
4290                 file_free(req, fsp);
4291                 return NT_STATUS_NO_MEMORY;
4292         }
4293
4294         /* For directories the delete on close bit at open time seems
4295            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4296         if (create_options & FILE_DELETE_ON_CLOSE) {
4297                 status = can_set_delete_on_close(fsp, 0);
4298                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4299                         del_share_mode(lck, fsp);
4300                         TALLOC_FREE(lck);
4301                         fd_close(fsp);
4302                         file_free(req, fsp);
4303                         return status;
4304                 }
4305
4306                 if (NT_STATUS_IS_OK(status)) {
4307                         /* Note that here we set the *initial* delete on close flag,
4308                            not the regular one. The magic gets handled in close. */
4309                         fsp->initial_delete_on_close = True;
4310                 }
4311         }
4312
4313         {
4314                 /*
4315                  * Deal with other opens having a modified write time. Is this
4316                  * possible for directories?
4317                  */
4318                 struct timespec write_time = get_share_mode_write_time(lck);
4319
4320                 if (!null_timespec(write_time)) {
4321                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4322                 }
4323         }
4324
4325         TALLOC_FREE(lck);
4326
4327         if (pinfo) {
4328                 *pinfo = info;
4329         }
4330
4331         *result = fsp;
4332         return NT_STATUS_OK;
4333 }
4334
4335 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4336                           struct smb_filename *smb_dname)
4337 {
4338         NTSTATUS status;
4339         files_struct *fsp;
4340
4341         status = SMB_VFS_CREATE_FILE(
4342                 conn,                                   /* conn */
4343                 req,                                    /* req */
4344                 0,                                      /* root_dir_fid */
4345                 smb_dname,                              /* fname */
4346                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4347                 FILE_SHARE_NONE,                        /* share_access */
4348                 FILE_CREATE,                            /* create_disposition*/
4349                 FILE_DIRECTORY_FILE,                    /* create_options */
4350                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4351                 0,                                      /* oplock_request */
4352                 NULL,                                   /* lease */
4353                 0,                                      /* allocation_size */
4354                 0,                                      /* private_flags */
4355                 NULL,                                   /* sd */
4356                 NULL,                                   /* ea_list */
4357                 &fsp,                                   /* result */
4358                 NULL,                                   /* pinfo */
4359                 NULL, NULL);                            /* create context */
4360
4361         if (NT_STATUS_IS_OK(status)) {
4362                 close_file(req, fsp, NORMAL_CLOSE);
4363         }
4364
4365         return status;
4366 }
4367
4368 /****************************************************************************
4369  Receive notification that one of our open files has been renamed by another
4370  smbd process.
4371 ****************************************************************************/
4372
4373 void msg_file_was_renamed(struct messaging_context *msg,
4374                           void *private_data,
4375                           uint32_t msg_type,
4376                           struct server_id server_id,
4377                           DATA_BLOB *data)
4378 {
4379         files_struct *fsp;
4380         char *frm = (char *)data->data;
4381         struct file_id id;
4382         const char *sharepath;
4383         const char *base_name;
4384         const char *stream_name;
4385         struct smb_filename *smb_fname = NULL;
4386         size_t sp_len, bn_len;
4387         NTSTATUS status;
4388         struct smbd_server_connection *sconn =
4389                 talloc_get_type_abort(private_data,
4390                 struct smbd_server_connection);
4391
4392         if (data->data == NULL
4393             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
4394                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
4395                           (int)data->length));
4396                 return;
4397         }
4398
4399         /* Unpack the message. */
4400         pull_file_id_24(frm, &id);
4401         sharepath = &frm[24];
4402         sp_len = strlen(sharepath);
4403         base_name = sharepath + sp_len + 1;
4404         bn_len = strlen(base_name);
4405         stream_name = sharepath + sp_len + 1 + bn_len + 1;
4406
4407         /* stream_name must always be NULL if there is no stream. */
4408         if (stream_name[0] == '\0') {
4409                 stream_name = NULL;
4410         }
4411
4412         smb_fname = synthetic_smb_fname(talloc_tos(),
4413                                         base_name,
4414                                         stream_name,
4415                                         NULL,
4416                                         0);
4417         if (smb_fname == NULL) {
4418                 return;
4419         }
4420
4421         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
4422                 "file_id %s\n",
4423                 sharepath, smb_fname_str_dbg(smb_fname),
4424                 file_id_string_tos(&id)));
4425
4426         for(fsp = file_find_di_first(sconn, id); fsp;
4427             fsp = file_find_di_next(fsp)) {
4428                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
4429
4430                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
4431                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
4432                                 smb_fname_str_dbg(smb_fname)));
4433                         status = fsp_set_smb_fname(fsp, smb_fname);
4434                         if (!NT_STATUS_IS_OK(status)) {
4435                                 goto out;
4436                         }
4437                 } else {
4438                         /* TODO. JRA. */
4439                         /* Now we have the complete path we can work out if this is
4440                            actually within this share and adjust newname accordingly. */
4441                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
4442                                 "not sharepath %s) "
4443                                 "%s from %s -> %s\n",
4444                                 fsp->conn->connectpath,
4445                                 sharepath,
4446                                 fsp_fnum_dbg(fsp),
4447                                 fsp_str_dbg(fsp),
4448                                 smb_fname_str_dbg(smb_fname)));
4449                 }
4450         }
4451  out:
4452         TALLOC_FREE(smb_fname);
4453         return;
4454 }
4455
4456 /*
4457  * If a main file is opened for delete, all streams need to be checked for
4458  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4459  * If that works, delete them all by setting the delete on close and close.
4460  */
4461
4462 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4463                                         const struct smb_filename *smb_fname)
4464 {
4465         struct stream_struct *stream_info = NULL;
4466         files_struct **streams = NULL;
4467         int i;
4468         unsigned int num_streams = 0;
4469         TALLOC_CTX *frame = talloc_stackframe();
4470         NTSTATUS status;
4471
4472         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4473                                 &num_streams, &stream_info);
4474
4475         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4476             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4477                 DEBUG(10, ("no streams around\n"));
4478                 TALLOC_FREE(frame);
4479                 return NT_STATUS_OK;
4480         }
4481
4482         if (!NT_STATUS_IS_OK(status)) {
4483                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4484                            nt_errstr(status)));
4485                 goto fail;
4486         }
4487
4488         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4489                    num_streams));
4490
4491         if (num_streams == 0) {
4492                 TALLOC_FREE(frame);
4493                 return NT_STATUS_OK;
4494         }
4495
4496         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4497         if (streams == NULL) {
4498                 DEBUG(0, ("talloc failed\n"));
4499                 status = NT_STATUS_NO_MEMORY;
4500                 goto fail;
4501         }
4502
4503         for (i=0; i<num_streams; i++) {
4504                 struct smb_filename *smb_fname_cp;
4505
4506                 if (strequal(stream_info[i].name, "::$DATA")) {
4507                         streams[i] = NULL;
4508                         continue;
4509                 }
4510
4511                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4512                                         smb_fname->base_name,
4513                                         stream_info[i].name,
4514                                         NULL,
4515                                         (smb_fname->flags &
4516                                                 ~SMB_FILENAME_POSIX_PATH));
4517                 if (smb_fname_cp == NULL) {
4518                         status = NT_STATUS_NO_MEMORY;
4519                         goto fail;
4520                 }
4521
4522                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4523                         DEBUG(10, ("Unable to stat stream: %s\n",
4524                                    smb_fname_str_dbg(smb_fname_cp)));
4525                 }
4526
4527                 status = SMB_VFS_CREATE_FILE(
4528                          conn,                  /* conn */
4529                          NULL,                  /* req */
4530                          0,                     /* root_dir_fid */
4531                          smb_fname_cp,          /* fname */
4532                          DELETE_ACCESS,         /* access_mask */
4533                          (FILE_SHARE_READ |     /* share_access */
4534                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4535                          FILE_OPEN,             /* create_disposition*/
4536                          0,                     /* create_options */
4537                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4538                          0,                     /* oplock_request */
4539                          NULL,                  /* lease */
4540                          0,                     /* allocation_size */
4541                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4542                          NULL,                  /* sd */
4543                          NULL,                  /* ea_list */
4544                          &streams[i],           /* result */
4545                          NULL,                  /* pinfo */
4546                          NULL, NULL);           /* create context */
4547
4548                 if (!NT_STATUS_IS_OK(status)) {
4549                         DEBUG(10, ("Could not open stream %s: %s\n",
4550                                    smb_fname_str_dbg(smb_fname_cp),
4551                                    nt_errstr(status)));
4552
4553                         TALLOC_FREE(smb_fname_cp);
4554                         break;
4555                 }
4556                 TALLOC_FREE(smb_fname_cp);
4557         }
4558
4559         /*
4560          * don't touch the variable "status" beyond this point :-)
4561          */
4562
4563         for (i -= 1 ; i >= 0; i--) {
4564                 if (streams[i] == NULL) {
4565                         continue;
4566                 }
4567
4568                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4569                            fsp_str_dbg(streams[i])));
4570                 close_file(NULL, streams[i], NORMAL_CLOSE);
4571         }
4572
4573  fail:
4574         TALLOC_FREE(frame);
4575         return status;
4576 }
4577
4578 /*********************************************************************
4579  Create a default ACL by inheriting from the parent. If no inheritance
4580  from the parent available, don't set anything. This will leave the actual
4581  permissions the new file or directory already got from the filesystem
4582  as the NT ACL when read.
4583 *********************************************************************/
4584
4585 static NTSTATUS inherit_new_acl(files_struct *fsp)
4586 {
4587         TALLOC_CTX *frame = talloc_stackframe();
4588         char *parent_name = NULL;
4589         struct security_descriptor *parent_desc = NULL;
4590         NTSTATUS status = NT_STATUS_OK;
4591         struct security_descriptor *psd = NULL;
4592         const struct dom_sid *owner_sid = NULL;
4593         const struct dom_sid *group_sid = NULL;
4594         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4595         struct security_token *token = fsp->conn->session_info->security_token;
4596         bool inherit_owner =
4597             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4598         bool inheritable_components = false;
4599         bool try_builtin_administrators = false;
4600         const struct dom_sid *BA_U_sid = NULL;
4601         const struct dom_sid *BA_G_sid = NULL;
4602         bool try_system = false;
4603         const struct dom_sid *SY_U_sid = NULL;
4604         const struct dom_sid *SY_G_sid = NULL;
4605         size_t size = 0;
4606         struct smb_filename *parent_smb_fname = NULL;
4607
4608         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4609                 TALLOC_FREE(frame);
4610                 return NT_STATUS_NO_MEMORY;
4611         }
4612         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4613                                                 parent_name,
4614                                                 NULL,
4615                                                 NULL,
4616                                                 fsp->fsp_name->flags);
4617
4618         if (parent_smb_fname == NULL) {
4619                 TALLOC_FREE(frame);
4620                 return NT_STATUS_NO_MEMORY;
4621         }
4622
4623         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4624                                     parent_smb_fname,
4625                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4626                                     frame,
4627                                     &parent_desc);
4628         if (!NT_STATUS_IS_OK(status)) {
4629                 TALLOC_FREE(frame);
4630                 return status;
4631         }
4632
4633         inheritable_components = sd_has_inheritable_components(parent_desc,
4634                                         fsp->is_directory);
4635
4636         if (!inheritable_components && !inherit_owner) {
4637                 TALLOC_FREE(frame);
4638                 /* Nothing to inherit and not setting owner. */
4639                 return NT_STATUS_OK;
4640         }
4641
4642         /* Create an inherited descriptor from the parent. */
4643
4644         if (DEBUGLEVEL >= 10) {
4645                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4646                         fsp_str_dbg(fsp) ));
4647                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4648         }
4649
4650         /* Inherit from parent descriptor if "inherit owner" set. */
4651         if (inherit_owner) {
4652                 owner_sid = parent_desc->owner_sid;
4653                 group_sid = parent_desc->group_sid;
4654         }
4655
4656         if (owner_sid == NULL) {
4657                 if (security_token_has_builtin_administrators(token)) {
4658                         try_builtin_administrators = true;
4659                 } else if (security_token_is_system(token)) {
4660                         try_builtin_administrators = true;
4661                         try_system = true;
4662                 }
4663         }
4664
4665         if (group_sid == NULL &&
4666             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4667         {
4668                 if (security_token_is_system(token)) {
4669                         try_builtin_administrators = true;
4670                         try_system = true;
4671                 }
4672         }
4673
4674         if (try_builtin_administrators) {
4675                 struct unixid ids;
4676                 bool ok;
4677
4678                 ZERO_STRUCT(ids);
4679                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4680                 if (ok) {
4681                         switch (ids.type) {
4682                         case ID_TYPE_BOTH:
4683                                 BA_U_sid = &global_sid_Builtin_Administrators;
4684                                 BA_G_sid = &global_sid_Builtin_Administrators;
4685                                 break;
4686                         case ID_TYPE_UID:
4687                                 BA_U_sid = &global_sid_Builtin_Administrators;
4688                                 break;
4689                         case ID_TYPE_GID:
4690                                 BA_G_sid = &global_sid_Builtin_Administrators;
4691                                 break;
4692                         default:
4693                                 break;
4694                         }
4695                 }
4696         }
4697
4698         if (try_system) {
4699                 struct unixid ids;
4700                 bool ok;
4701
4702                 ZERO_STRUCT(ids);
4703                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4704                 if (ok) {
4705                         switch (ids.type) {
4706                         case ID_TYPE_BOTH:
4707                                 SY_U_sid = &global_sid_System;
4708                                 SY_G_sid = &global_sid_System;
4709                                 break;
4710                         case ID_TYPE_UID:
4711                                 SY_U_sid = &global_sid_System;
4712                                 break;
4713                         case ID_TYPE_GID:
4714                                 SY_G_sid = &global_sid_System;
4715                                 break;
4716                         default:
4717                                 break;
4718                         }
4719                 }
4720         }
4721
4722         if (owner_sid == NULL) {
4723                 owner_sid = BA_U_sid;
4724         }
4725
4726         if (owner_sid == NULL) {
4727                 owner_sid = SY_U_sid;
4728         }
4729
4730         if (group_sid == NULL) {
4731                 group_sid = SY_G_sid;
4732         }
4733
4734         if (try_system && group_sid == NULL) {
4735                 group_sid = BA_G_sid;
4736         }
4737
4738         if (owner_sid == NULL) {
4739                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4740         }
4741         if (group_sid == NULL) {
4742                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4743                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4744                 } else {
4745                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4746                 }
4747         }
4748
4749         status = se_create_child_secdesc(frame,
4750                         &psd,
4751                         &size,
4752                         parent_desc,
4753                         owner_sid,
4754                         group_sid,
4755                         fsp->is_directory);
4756         if (!NT_STATUS_IS_OK(status)) {
4757                 TALLOC_FREE(frame);
4758                 return status;
4759         }
4760
4761         /* If inheritable_components == false,
4762            se_create_child_secdesc()
4763            creates a security descriptor with a NULL dacl
4764            entry, but with SEC_DESC_DACL_PRESENT. We need
4765            to remove that flag. */
4766
4767         if (!inheritable_components) {
4768                 security_info_sent &= ~SECINFO_DACL;
4769                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4770         }
4771
4772         if (DEBUGLEVEL >= 10) {
4773                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4774                         fsp_str_dbg(fsp) ));
4775                 NDR_PRINT_DEBUG(security_descriptor, psd);
4776         }
4777
4778         if (inherit_owner) {
4779                 /* We need to be root to force this. */
4780                 become_root();
4781         }
4782         status = SMB_VFS_FSET_NT_ACL(fsp,
4783                         security_info_sent,
4784                         psd);
4785         if (inherit_owner) {
4786                 unbecome_root();
4787         }
4788         TALLOC_FREE(frame);
4789         return status;
4790 }
4791
4792 /*
4793  * If we already have a lease, it must match the new file id. [MS-SMB2]
4794  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4795  * used for a different file name.
4796  */
4797
4798 struct lease_match_state {
4799         /* Input parameters. */
4800         TALLOC_CTX *mem_ctx;
4801         const char *servicepath;
4802         const struct smb_filename *fname;
4803         bool file_existed;
4804         struct file_id id;
4805         /* Return parameters. */
4806         uint32_t num_file_ids;
4807         struct file_id *ids;
4808         NTSTATUS match_status;
4809 };
4810
4811 /*************************************************************
4812  File doesn't exist but this lease key+guid is already in use.
4813
4814  This is only allowable in the dynamic share case where the
4815  service path must be different.
4816
4817  There is a small race condition here in the multi-connection
4818  case where a client sends two create calls on different connections,
4819  where the file doesn't exist and one smbd creates the leases_db
4820  entry first, but this will get fixed by the multichannel cleanup
4821  when all identical client_guids get handled by a single smbd.
4822 **************************************************************/
4823
4824 static void lease_match_parser_new_file(
4825         uint32_t num_files,
4826         const struct leases_db_file *files,
4827         struct lease_match_state *state)
4828 {
4829         uint32_t i;
4830
4831         for (i = 0; i < num_files; i++) {
4832                 const struct leases_db_file *f = &files[i];
4833                 if (strequal(state->servicepath, f->servicepath)) {
4834                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4835                         return;
4836                 }
4837         }
4838
4839         /* Dynamic share case. Break leases on all other files. */
4840         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4841                                         num_files,
4842                                         files,
4843                                         &state->ids);
4844         if (!NT_STATUS_IS_OK(state->match_status)) {
4845                 return;
4846         }
4847
4848         state->num_file_ids = num_files;
4849         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4850         return;
4851 }
4852
4853 static void lease_match_parser(
4854         uint32_t num_files,
4855         const struct leases_db_file *files,
4856         void *private_data)
4857 {
4858         struct lease_match_state *state =
4859                 (struct lease_match_state *)private_data;
4860         uint32_t i;
4861
4862         if (!state->file_existed) {
4863                 /*
4864                  * Deal with name mismatch or
4865                  * possible dynamic share case separately
4866                  * to make code clearer.
4867                  */
4868                 lease_match_parser_new_file(num_files,
4869                                                 files,
4870                                                 state);
4871                 return;
4872         }
4873
4874         /* File existed. */
4875         state->match_status = NT_STATUS_OK;
4876
4877         for (i = 0; i < num_files; i++) {
4878                 const struct leases_db_file *f = &files[i];
4879
4880                 /* Everything should be the same. */
4881                 if (!file_id_equal(&state->id, &f->id)) {
4882                         /* This should catch all dynamic share cases. */
4883                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4884                         break;
4885                 }
4886                 if (!strequal(f->servicepath, state->servicepath)) {
4887                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4888                         break;
4889                 }
4890                 if (!strequal(f->base_name, state->fname->base_name)) {
4891                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4892                         break;
4893                 }
4894                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4895                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4896                         break;
4897                 }
4898         }
4899
4900         if (NT_STATUS_IS_OK(state->match_status)) {
4901                 /*
4902                  * Common case - just opening another handle on a
4903                  * file on a non-dynamic share.
4904                  */
4905                 return;
4906         }
4907
4908         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4909                 /* Mismatched path. Error back to client. */
4910                 return;
4911         }
4912
4913         /*
4914          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4915          * Don't allow leases.
4916          */
4917
4918         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4919                                         num_files,
4920                                         files,
4921                                         &state->ids);
4922         if (!NT_STATUS_IS_OK(state->match_status)) {
4923                 return;
4924         }
4925
4926         state->num_file_ids = num_files;
4927         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4928         return;
4929 }
4930
4931 static NTSTATUS lease_match(connection_struct *conn,
4932                             struct smb_request *req,
4933                             struct smb2_lease_key *lease_key,
4934                             const char *servicepath,
4935                             const struct smb_filename *fname,
4936                             uint16_t *p_version,
4937                             uint16_t *p_epoch)
4938 {
4939         struct smbd_server_connection *sconn = req->sconn;
4940         TALLOC_CTX *tos = talloc_tos();
4941         struct lease_match_state state = {
4942                 .mem_ctx = tos,
4943                 .servicepath = servicepath,
4944                 .fname = fname,
4945                 .match_status = NT_STATUS_OK
4946         };
4947         uint32_t i;
4948         NTSTATUS status;
4949
4950         state.file_existed = VALID_STAT(fname->st);
4951         if (state.file_existed) {
4952                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
4953         }
4954
4955         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
4956                                  lease_key, lease_match_parser, &state);
4957         if (!NT_STATUS_IS_OK(status)) {
4958                 /*
4959                  * Not found or error means okay: We can make the lease pass
4960                  */
4961                 return NT_STATUS_OK;
4962         }
4963         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
4964                 /*
4965                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
4966                  * deal with it.
4967                  */
4968                 return state.match_status;
4969         }
4970
4971         /* We have to break all existing leases. */
4972         for (i = 0; i < state.num_file_ids; i++) {
4973                 struct share_mode_lock *lck;
4974                 struct share_mode_data *d;
4975                 uint32_t j;
4976
4977                 if (file_id_equal(&state.ids[i], &state.id)) {
4978                         /* Don't need to break our own file. */
4979                         continue;
4980                 }
4981
4982                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
4983                 if (lck == NULL) {
4984                         /* Race condition - file already closed. */
4985                         continue;
4986                 }
4987                 d = lck->data;
4988                 for (j=0; j<d->num_share_modes; j++) {
4989                         struct share_mode_entry *e = &d->share_modes[j];
4990                         uint32_t e_lease_type = get_lease_type(d, e);
4991
4992                         if (share_mode_stale_pid(d, j)) {
4993                                 continue;
4994                         }
4995
4996                         if (e->op_type == LEASE_OPLOCK) {
4997                                 struct share_mode_lease *l = NULL;
4998                                 l = &lck->data->leases[e->lease_idx];
4999                                 if (!smb2_lease_key_equal(&l->lease_key,
5000                                                           lease_key)) {
5001                                         continue;
5002                                 }
5003                                 *p_epoch = l->epoch;
5004                                 *p_version = l->lease_version;
5005                         }
5006
5007                         if (e_lease_type == SMB2_LEASE_NONE) {
5008                                 continue;
5009                         }
5010
5011                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
5012                                            SMB2_LEASE_NONE);
5013
5014                         /*
5015                          * Windows 7 and 8 lease clients
5016                          * are broken in that they will not
5017                          * respond to lease break requests
5018                          * whilst waiting for an outstanding
5019                          * open request on that lease handle
5020                          * on the same TCP connection, due
5021                          * to holding an internal inode lock.
5022                          *
5023                          * This means we can't reschedule
5024                          * ourselves here, but must return
5025                          * from the create.
5026                          *
5027                          * Work around:
5028                          *
5029                          * Send the breaks and then return
5030                          * SMB2_LEASE_NONE in the lease handle
5031                          * to cause them to acknowledge the
5032                          * lease break. Consultation with
5033                          * Microsoft engineering confirmed
5034                          * this approach is safe.
5035                          */
5036
5037                 }
5038                 TALLOC_FREE(lck);
5039         }
5040         /*
5041          * Ensure we don't grant anything more so we
5042          * never upgrade.
5043          */
5044         return NT_STATUS_OPLOCK_NOT_GRANTED;
5045 }
5046
5047 /*
5048  * Wrapper around open_file_ntcreate and open_directory
5049  */
5050
5051 static NTSTATUS create_file_unixpath(connection_struct *conn,
5052                                      struct smb_request *req,
5053                                      struct smb_filename *smb_fname,
5054                                      uint32_t access_mask,
5055                                      uint32_t share_access,
5056                                      uint32_t create_disposition,
5057                                      uint32_t create_options,
5058                                      uint32_t file_attributes,
5059                                      uint32_t oplock_request,
5060                                      struct smb2_lease *lease,
5061                                      uint64_t allocation_size,
5062                                      uint32_t private_flags,
5063                                      struct security_descriptor *sd,
5064                                      struct ea_list *ea_list,
5065
5066                                      files_struct **result,
5067                                      int *pinfo)
5068 {
5069         int info = FILE_WAS_OPENED;
5070         files_struct *base_fsp = NULL;
5071         files_struct *fsp = NULL;
5072         NTSTATUS status;
5073
5074         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5075                   "file_attributes = 0x%x, share_access = 0x%x, "
5076                   "create_disposition = 0x%x create_options = 0x%x "
5077                   "oplock_request = 0x%x private_flags = 0x%x "
5078                   "ea_list = %p, sd = %p, "
5079                   "fname = %s\n",
5080                   (unsigned int)access_mask,
5081                   (unsigned int)file_attributes,
5082                   (unsigned int)share_access,
5083                   (unsigned int)create_disposition,
5084                   (unsigned int)create_options,
5085                   (unsigned int)oplock_request,
5086                   (unsigned int)private_flags,
5087                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5088
5089         if (create_options & FILE_OPEN_BY_FILE_ID) {
5090                 status = NT_STATUS_NOT_SUPPORTED;
5091                 goto fail;
5092         }
5093
5094         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5095                 status = NT_STATUS_INVALID_PARAMETER;
5096                 goto fail;
5097         }
5098
5099         if (req == NULL) {
5100                 oplock_request |= INTERNAL_OPEN_ONLY;
5101         }
5102
5103         if (lease != NULL) {
5104                 uint16_t epoch = lease->lease_epoch;
5105                 uint16_t version = lease->lease_version;
5106
5107                 if (req == NULL) {
5108                         DBG_WARNING("Got lease on internal open\n");
5109                         status = NT_STATUS_INTERNAL_ERROR;
5110                         goto fail;
5111                 }
5112
5113                 status = lease_match(conn,
5114                                 req,
5115                                 &lease->lease_key,
5116                                 conn->connectpath,
5117                                 smb_fname,
5118                                 &version,
5119                                 &epoch);
5120                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5121                         /* Dynamic share file. No leases and update epoch... */
5122                         lease->lease_state = SMB2_LEASE_NONE;
5123                         lease->lease_epoch = epoch;
5124                         lease->lease_version = version;
5125                 } else if (!NT_STATUS_IS_OK(status)) {
5126                         goto fail;
5127                 }
5128         }
5129
5130         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5131             && (access_mask & DELETE_ACCESS)
5132             && !is_ntfs_stream_smb_fname(smb_fname)) {
5133                 /*
5134                  * We can't open a file with DELETE access if any of the
5135                  * streams is open without FILE_SHARE_DELETE
5136                  */
5137                 status = open_streams_for_delete(conn, smb_fname);
5138
5139                 if (!NT_STATUS_IS_OK(status)) {
5140                         goto fail;
5141                 }
5142         }
5143
5144         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5145                         !security_token_has_privilege(get_current_nttok(conn),
5146                                         SEC_PRIV_SECURITY)) {
5147                 DEBUG(10, ("create_file_unixpath: open on %s "
5148                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5149                         smb_fname_str_dbg(smb_fname)));
5150                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5151                 goto fail;
5152         }
5153
5154         /*
5155          * Files or directories can't be opened DELETE_ON_CLOSE without
5156          * delete access.
5157          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5158          */
5159         if (create_options & FILE_DELETE_ON_CLOSE) {
5160                 if ((access_mask & DELETE_ACCESS) == 0) {
5161                         status = NT_STATUS_INVALID_PARAMETER;
5162                         goto fail;
5163                 }
5164         }
5165
5166         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5167             && is_ntfs_stream_smb_fname(smb_fname)
5168             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5169                 uint32_t base_create_disposition;
5170                 struct smb_filename *smb_fname_base = NULL;
5171                 uint32_t base_privflags;
5172
5173                 if (create_options & FILE_DIRECTORY_FILE) {
5174                         status = NT_STATUS_NOT_A_DIRECTORY;
5175                         goto fail;
5176                 }
5177
5178                 switch (create_disposition) {
5179                 case FILE_OPEN:
5180                         base_create_disposition = FILE_OPEN;
5181                         break;
5182                 default:
5183                         base_create_disposition = FILE_OPEN_IF;
5184                         break;
5185                 }
5186
5187                 /* Create an smb_filename with stream_name == NULL. */
5188                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5189                                                 smb_fname->base_name,
5190                                                 NULL,
5191                                                 NULL,
5192                                                 smb_fname->flags);
5193                 if (smb_fname_base == NULL) {
5194                         status = NT_STATUS_NO_MEMORY;
5195                         goto fail;
5196                 }
5197
5198                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5199                         DEBUG(10, ("Unable to stat stream: %s\n",
5200                                    smb_fname_str_dbg(smb_fname_base)));
5201                 } else {
5202                         /*
5203                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5204                          * We need to check if the requested access mask
5205                          * could be used to open the underlying file (if
5206                          * it existed), as we're passing in zero for the
5207                          * access mask to the base filename.
5208                          */
5209                         status = check_base_file_access(conn,
5210                                                         smb_fname_base,
5211                                                         access_mask);
5212
5213                         if (!NT_STATUS_IS_OK(status)) {
5214                                 DEBUG(10, ("Permission check "
5215                                         "for base %s failed: "
5216                                         "%s\n", smb_fname->base_name,
5217                                         nt_errstr(status)));
5218                                 goto fail;
5219                         }
5220                 }
5221
5222                 base_privflags = NTCREATEX_OPTIONS_PRIVATE_STREAM_BASEOPEN;
5223
5224                 /* Open the base file. */
5225                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5226                                               FILE_SHARE_READ
5227                                               | FILE_SHARE_WRITE
5228                                               | FILE_SHARE_DELETE,
5229                                               base_create_disposition,
5230                                               0, 0, 0, NULL, 0,
5231                                               base_privflags,
5232                                               NULL, NULL,
5233                                               &base_fsp, NULL);
5234                 TALLOC_FREE(smb_fname_base);
5235
5236                 if (!NT_STATUS_IS_OK(status)) {
5237                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5238                                    "%s\n", smb_fname->base_name,
5239                                    nt_errstr(status)));
5240                         goto fail;
5241                 }
5242                 /* we don't need the low level fd */
5243                 fd_close(base_fsp);
5244         }
5245
5246         /*
5247          * If it's a request for a directory open, deal with it separately.
5248          */
5249
5250         if (create_options & FILE_DIRECTORY_FILE) {
5251
5252                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5253                         status = NT_STATUS_INVALID_PARAMETER;
5254                         goto fail;
5255                 }
5256
5257                 /* Can't open a temp directory. IFS kit test. */
5258                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5259                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5260                         status = NT_STATUS_INVALID_PARAMETER;
5261                         goto fail;
5262                 }
5263
5264                 /*
5265                  * We will get a create directory here if the Win32
5266                  * app specified a security descriptor in the
5267                  * CreateDirectory() call.
5268                  */
5269
5270                 oplock_request = 0;
5271                 status = open_directory(
5272                         conn, req, smb_fname, access_mask, share_access,
5273                         create_disposition, create_options, file_attributes,
5274                         &info, &fsp);
5275         } else {
5276
5277                 /*
5278                  * Ordinary file case.
5279                  */
5280
5281                 status = file_new(req, conn, &fsp);
5282                 if(!NT_STATUS_IS_OK(status)) {
5283                         goto fail;
5284                 }
5285
5286                 status = fsp_set_smb_fname(fsp, smb_fname);
5287                 if (!NT_STATUS_IS_OK(status)) {
5288                         goto fail;
5289                 }
5290
5291                 if (base_fsp) {
5292                         /*
5293                          * We're opening the stream element of a
5294                          * base_fsp we already opened. Set up the
5295                          * base_fsp pointer.
5296                          */
5297                         fsp->base_fsp = base_fsp;
5298                 }
5299
5300                 if (allocation_size) {
5301                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5302                                                         allocation_size);
5303                 }
5304
5305                 status = open_file_ntcreate(conn,
5306                                             req,
5307                                             access_mask,
5308                                             share_access,
5309                                             create_disposition,
5310                                             create_options,
5311                                             file_attributes,
5312                                             oplock_request,
5313                                             lease,
5314                                             private_flags,
5315                                             &info,
5316                                             fsp);
5317
5318                 if(!NT_STATUS_IS_OK(status)) {
5319                         file_free(req, fsp);
5320                         fsp = NULL;
5321                 }
5322
5323                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5324
5325                         /* A stream open never opens a directory */
5326
5327                         if (base_fsp) {
5328                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5329                                 goto fail;
5330                         }
5331
5332                         /*
5333                          * Fail the open if it was explicitly a non-directory
5334                          * file.
5335                          */
5336
5337                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5338                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5339                                 goto fail;
5340                         }
5341
5342                         oplock_request = 0;
5343                         status = open_directory(
5344                                 conn, req, smb_fname, access_mask,
5345                                 share_access, create_disposition,
5346                                 create_options, file_attributes,
5347                                 &info, &fsp);
5348                 }
5349         }
5350
5351         if (!NT_STATUS_IS_OK(status)) {
5352                 goto fail;
5353         }
5354
5355         fsp->base_fsp = base_fsp;
5356
5357         if ((ea_list != NULL) &&
5358             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5359                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5360                 if (!NT_STATUS_IS_OK(status)) {
5361                         goto fail;
5362                 }
5363         }
5364
5365         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5366                 status = NT_STATUS_ACCESS_DENIED;
5367                 goto fail;
5368         }
5369
5370         /* Save the requested allocation size. */
5371         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5372                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5373                     && !(fsp->is_directory))
5374                 {
5375                         fsp->initial_allocation_size = smb_roundup(
5376                                 fsp->conn, allocation_size);
5377                         if (vfs_allocate_file_space(
5378                                     fsp, fsp->initial_allocation_size) == -1) {
5379                                 status = NT_STATUS_DISK_FULL;
5380                                 goto fail;
5381                         }
5382                 } else {
5383                         fsp->initial_allocation_size = smb_roundup(
5384                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5385                 }
5386         } else {
5387                 fsp->initial_allocation_size = 0;
5388         }
5389
5390         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5391                                 fsp->base_fsp == NULL) {
5392                 if (sd != NULL) {
5393                         /*
5394                          * According to the MS documentation, the only time the security
5395                          * descriptor is applied to the opened file is iff we *created* the
5396                          * file; an existing file stays the same.
5397                          *
5398                          * Also, it seems (from observation) that you can open the file with
5399                          * any access mask but you can still write the sd. We need to override
5400                          * the granted access before we call set_sd
5401                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5402                          */
5403
5404                         uint32_t sec_info_sent;
5405                         uint32_t saved_access_mask = fsp->access_mask;
5406
5407                         sec_info_sent = get_sec_info(sd);
5408
5409                         fsp->access_mask = FILE_GENERIC_ALL;
5410
5411                         if (sec_info_sent & (SECINFO_OWNER|
5412                                                 SECINFO_GROUP|
5413                                                 SECINFO_DACL|
5414                                                 SECINFO_SACL)) {
5415                                 status = set_sd(fsp, sd, sec_info_sent);
5416                         }
5417
5418                         fsp->access_mask = saved_access_mask;
5419
5420                         if (!NT_STATUS_IS_OK(status)) {
5421                                 goto fail;
5422                         }
5423                 } else if (lp_inherit_acls(SNUM(conn))) {
5424                         /* Inherit from parent. Errors here are not fatal. */
5425                         status = inherit_new_acl(fsp);
5426                         if (!NT_STATUS_IS_OK(status)) {
5427                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5428                                         fsp_str_dbg(fsp),
5429                                         nt_errstr(status) ));
5430                         }
5431                 }
5432         }
5433
5434         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5435          && (create_options & FILE_NO_COMPRESSION)
5436          && (info == FILE_WAS_CREATED)) {
5437                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5438                                                  COMPRESSION_FORMAT_NONE);
5439                 if (!NT_STATUS_IS_OK(status)) {
5440                         DEBUG(1, ("failed to disable compression: %s\n",
5441                                   nt_errstr(status)));
5442                 }
5443         }
5444
5445         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5446
5447         *result = fsp;
5448         if (pinfo != NULL) {
5449                 *pinfo = info;
5450         }
5451
5452         smb_fname->st = fsp->fsp_name->st;
5453
5454         return NT_STATUS_OK;
5455
5456  fail:
5457         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5458
5459         if (fsp != NULL) {
5460                 if (base_fsp && fsp->base_fsp == base_fsp) {
5461                         /*
5462                          * The close_file below will close
5463                          * fsp->base_fsp.
5464                          */
5465                         base_fsp = NULL;
5466                 }
5467                 close_file(req, fsp, ERROR_CLOSE);
5468                 fsp = NULL;
5469         }
5470         if (base_fsp != NULL) {
5471                 close_file(req, base_fsp, ERROR_CLOSE);
5472                 base_fsp = NULL;
5473         }
5474         return status;
5475 }
5476
5477 /*
5478  * Calculate the full path name given a relative fid.
5479  */
5480 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5481                                    struct smb_request *req,
5482                                    uint16_t root_dir_fid,
5483                                    const struct smb_filename *smb_fname,
5484                                    struct smb_filename **smb_fname_out)
5485 {
5486         files_struct *dir_fsp;
5487         char *parent_fname = NULL;
5488         char *new_base_name = NULL;
5489         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5490         NTSTATUS status;
5491
5492         if (root_dir_fid == 0 || !smb_fname) {
5493                 status = NT_STATUS_INTERNAL_ERROR;
5494                 goto out;
5495         }
5496
5497         dir_fsp = file_fsp(req, root_dir_fid);
5498
5499         if (dir_fsp == NULL) {
5500                 status = NT_STATUS_INVALID_HANDLE;
5501                 goto out;
5502         }
5503
5504         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5505                 status = NT_STATUS_INVALID_HANDLE;
5506                 goto out;
5507         }
5508
5509         if (!dir_fsp->is_directory) {
5510
5511                 /*
5512                  * Check to see if this is a mac fork of some kind.
5513                  */
5514
5515                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5516                     is_ntfs_stream_smb_fname(smb_fname)) {
5517                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5518                         goto out;
5519                 }
5520
5521                 /*
5522                   we need to handle the case when we get a
5523                   relative open relative to a file and the
5524                   pathname is blank - this is a reopen!
5525                   (hint from demyn plantenberg)
5526                 */
5527
5528                 status = NT_STATUS_INVALID_HANDLE;
5529                 goto out;
5530         }
5531
5532         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5533                 /*
5534                  * We're at the toplevel dir, the final file name
5535                  * must not contain ./, as this is filtered out
5536                  * normally by srvstr_get_path and unix_convert
5537                  * explicitly rejects paths containing ./.
5538                  */
5539                 parent_fname = talloc_strdup(talloc_tos(), "");
5540                 if (parent_fname == NULL) {
5541                         status = NT_STATUS_NO_MEMORY;
5542                         goto out;
5543                 }
5544         } else {
5545                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5546
5547                 /*
5548                  * Copy in the base directory name.
5549                  */
5550
5551                 parent_fname = talloc_array(talloc_tos(), char,
5552                     dir_name_len+2);
5553                 if (parent_fname == NULL) {
5554                         status = NT_STATUS_NO_MEMORY;
5555                         goto out;
5556                 }
5557                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5558                     dir_name_len+1);
5559
5560                 /*
5561                  * Ensure it ends in a '/'.
5562                  * We used TALLOC_SIZE +2 to add space for the '/'.
5563                  */
5564
5565                 if(dir_name_len
5566                     && (parent_fname[dir_name_len-1] != '\\')
5567                     && (parent_fname[dir_name_len-1] != '/')) {
5568                         parent_fname[dir_name_len] = '/';
5569                         parent_fname[dir_name_len+1] = '\0';
5570                 }
5571         }
5572
5573         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5574                                         smb_fname->base_name);
5575         if (new_base_name == NULL) {
5576                 status = NT_STATUS_NO_MEMORY;
5577                 goto out;
5578         }
5579
5580         status = filename_convert(req,
5581                                 conn,
5582                                 new_base_name,
5583                                 ucf_flags,
5584                                 NULL,
5585                                 NULL,
5586                                 smb_fname_out);
5587         if (!NT_STATUS_IS_OK(status)) {
5588                 goto out;
5589         }
5590
5591  out:
5592         TALLOC_FREE(parent_fname);
5593         TALLOC_FREE(new_base_name);
5594         return status;
5595 }
5596
5597 NTSTATUS create_file_default(connection_struct *conn,
5598                              struct smb_request *req,
5599                              uint16_t root_dir_fid,
5600                              struct smb_filename *smb_fname,
5601                              uint32_t access_mask,
5602                              uint32_t share_access,
5603                              uint32_t create_disposition,
5604                              uint32_t create_options,
5605                              uint32_t file_attributes,
5606                              uint32_t oplock_request,
5607                              struct smb2_lease *lease,
5608                              uint64_t allocation_size,
5609                              uint32_t private_flags,
5610                              struct security_descriptor *sd,
5611                              struct ea_list *ea_list,
5612                              files_struct **result,
5613                              int *pinfo,
5614                              const struct smb2_create_blobs *in_context_blobs,
5615                              struct smb2_create_blobs *out_context_blobs)
5616 {
5617         int info = FILE_WAS_OPENED;
5618         files_struct *fsp = NULL;
5619         NTSTATUS status;
5620         bool stream_name = false;
5621
5622         DBG_DEBUG("create_file: access_mask = 0x%x "
5623                   "file_attributes = 0x%x, share_access = 0x%x, "
5624                   "create_disposition = 0x%x create_options = 0x%x "
5625                   "oplock_request = 0x%x "
5626                   "private_flags = 0x%x "
5627                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5628                   "fname = %s\n",
5629                   (unsigned int)access_mask,
5630                   (unsigned int)file_attributes,
5631                   (unsigned int)share_access,
5632                   (unsigned int)create_disposition,
5633                   (unsigned int)create_options,
5634                   (unsigned int)oplock_request,
5635                   (unsigned int)private_flags,
5636                   (unsigned int)root_dir_fid,
5637                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5638
5639         /*
5640          * Calculate the filename from the root_dir_if if necessary.
5641          */
5642
5643         if (root_dir_fid != 0) {
5644                 struct smb_filename *smb_fname_out = NULL;
5645                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5646                                                    smb_fname, &smb_fname_out);
5647                 if (!NT_STATUS_IS_OK(status)) {
5648                         goto fail;
5649                 }
5650                 smb_fname = smb_fname_out;
5651         }
5652
5653         /*
5654          * Check to see if this is a mac fork of some kind.
5655          */
5656
5657         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5658         if (stream_name) {
5659                 enum FAKE_FILE_TYPE fake_file_type;
5660
5661                 fake_file_type = is_fake_file(smb_fname);
5662
5663                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5664
5665                         /*
5666                          * Here we go! support for changing the disk quotas
5667                          * --metze
5668                          *
5669                          * We need to fake up to open this MAGIC QUOTA file
5670                          * and return a valid FID.
5671                          *
5672                          * w2k close this file directly after openening xp
5673                          * also tries a QUERY_FILE_INFO on the file and then
5674                          * close it
5675                          */
5676                         status = open_fake_file(req, conn, req->vuid,
5677                                                 fake_file_type, smb_fname,
5678                                                 access_mask, &fsp);
5679                         if (!NT_STATUS_IS_OK(status)) {
5680                                 goto fail;
5681                         }
5682
5683                         ZERO_STRUCT(smb_fname->st);
5684                         goto done;
5685                 }
5686
5687                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5688                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5689                         goto fail;
5690                 }
5691         }
5692
5693         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5694                 int ret;
5695                 smb_fname->stream_name = NULL;
5696                 /* We have to handle this error here. */
5697                 if (create_options & FILE_DIRECTORY_FILE) {
5698                         status = NT_STATUS_NOT_A_DIRECTORY;
5699                         goto fail;
5700                 }
5701                 if (req != NULL && req->posix_pathnames) {
5702                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5703                 } else {
5704                         ret = SMB_VFS_STAT(conn, smb_fname);
5705                 }
5706
5707                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5708                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5709                         goto fail;
5710                 }
5711         }
5712
5713         status = create_file_unixpath(
5714                 conn, req, smb_fname, access_mask, share_access,
5715                 create_disposition, create_options, file_attributes,
5716                 oplock_request, lease, allocation_size, private_flags,
5717                 sd, ea_list,
5718                 &fsp, &info);
5719
5720         if (!NT_STATUS_IS_OK(status)) {
5721                 goto fail;
5722         }
5723
5724  done:
5725         DEBUG(10, ("create_file: info=%d\n", info));
5726
5727         *result = fsp;
5728         if (pinfo != NULL) {
5729                 *pinfo = info;
5730         }
5731         return NT_STATUS_OK;
5732
5733  fail:
5734         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5735
5736         if (fsp != NULL) {
5737                 close_file(req, fsp, ERROR_CLOSE);
5738                 fsp = NULL;
5739         }
5740         return status;
5741 }