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
 262         if (!parent_dirname(talloc_tos(),
 263                                 smb_fname->base_name,
 264                                 &parent_dir,
 265                                 NULL)) {
 266                 return NT_STATUS_NO_MEMORY;
 267         }
 268
 269         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
 270                                 parent_dir,
 271                                 NULL,
 272                                 NULL,
 273                                 smb_fname->flags);
 274         if (parent_smb_fname == NULL) {
 275                 return NT_STATUS_NO_MEMORY;
 276         }
 277
 278         if (get_current_uid(conn) == (uid_t)0) {
 279                 /* I'm sorry sir, I didn't know you were root... */
 280                 DEBUG(10,("check_parent_access: root override "
 281                         "on %s. Granting 0x%x\n",
 282                         smb_fname_str_dbg(smb_fname),
 283                         (unsigned int)access_mask ));
 284                 return NT_STATUS_OK;
 285         }
 286
 287         status = SMB_VFS_GET_NT_ACL(conn,
 288                                 parent_smb_fname,
 289                                 SECINFO_DACL,
 290                                     talloc_tos(),
 291                                 &parent_sd);
 292
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 295                         "%s with error %s\n",
 296                         parent_dir,
 297                         nt_errstr(status)));
 298                 return status;
 299         }
 300
 301         /*
 302          * If we can access the path to this file, by
 303          * default we have FILE_READ_ATTRIBUTES from the
 304          * containing directory. See the section:
 305          * "Algorithm to Check Access to an Existing File"
 306          * in MS-FSA.pdf.
 307          *
 308          * se_file_access_check() also takes care of
 309          * owner WRITE_DAC and READ_CONTROL.
 310          */
 311         status = se_file_access_check(parent_sd,
 312                                 get_current_nttok(conn),
 313                                 false,
 314                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 315                                 &access_granted);
 316         if(!NT_STATUS_IS_OK(status)) {
 317                 DEBUG(5,("check_parent_access: access check "
 318                         "on directory %s for "
 319                         "path %s for mask 0x%x returned (0x%x) %s\n",
 320                         parent_dir,
 321                         smb_fname->base_name,
 322                         access_mask,
 323                         access_granted,
 324                         nt_errstr(status) ));
 325                 return status;
 326         }
 327
 328         if (!(access_mask & (SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR))) {
 329                 return NT_STATUS_OK;
 330         }
 331         if (!lp_check_parent_directory_delete_on_close(SNUM(conn))) {
 332                 return NT_STATUS_OK;
 333         }
 334
 335         /* Check if the directory has delete-on-close set */
 336         ret = SMB_VFS_STAT(conn, parent_smb_fname);
 337         if (ret != 0) {
 338                 status = map_nt_error_from_unix(errno);
 339                 goto out;
 340         }
 341
 342         id = SMB_VFS_FILE_ID_CREATE(conn, &parent_smb_fname->st);
 343
 344         status = file_name_hash(conn, parent_smb_fname->base_name, &name_hash);
 345         if (!NT_STATUS_IS_OK(status)) {
 346                 goto out;
 347         }
 348
 349         lck = get_existing_share_mode_lock(talloc_tos(), id);
 350         if (lck == NULL) {
 351                 status = NT_STATUS_OK;
 352                 goto out;
 353         }
 354
 355         delete_on_close_set = is_delete_on_close_set(lck, name_hash);
 356         if (delete_on_close_set) {
 357                 status = NT_STATUS_DELETE_PENDING;
 358                 goto out;
 359         }
 360
 361         status = NT_STATUS_OK;
 362
 363 out:
 364         TALLOC_FREE(lck);
 365         TALLOC_FREE(parent_smb_fname);
 366         return status;
 367 }
 368
 369 /****************************************************************************
 370  Ensure when opening a base file for a stream open that we have permissions
 371  to do so given the access mask on the base file.
 372 ****************************************************************************/
 373
 374 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 375                                 struct smb_filename *smb_fname,
 376                                 uint32_t access_mask)
 377 {
 378         NTSTATUS status;
 379
 380         status = smbd_calculate_access_mask(conn, smb_fname,
 381                                         false,
 382                                         access_mask,
 383                                         &access_mask);
 384         if (!NT_STATUS_IS_OK(status)) {
 385                 DEBUG(10, ("smbd_calculate_access_mask "
 386                         "on file %s returned %s\n",
 387                         smb_fname_str_dbg(smb_fname),
 388                         nt_errstr(status)));
 389                 return status;
 390         }
 391
 392         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 393                 uint32_t dosattrs;
 394                 if (!CAN_WRITE(conn)) {
 395                         return NT_STATUS_ACCESS_DENIED;
 396                 }
 397                 dosattrs = dos_mode(conn, smb_fname);
 398                 if (IS_DOS_READONLY(dosattrs)) {
 399                         return NT_STATUS_ACCESS_DENIED;
 400                 }
 401         }
 402
 403         return smbd_check_access_rights(conn,
 404                                         smb_fname,
 405                                         false,
 406                                         access_mask);
 407 }
 408
 409 /****************************************************************************
 410  Handle differing symlink errno's
 411 ****************************************************************************/
 412
 413 static int link_errno_convert(int err)
 414 {
 415 #if defined(ENOTSUP) && defined(OSF1)
 416         /* handle special Tru64 errno */
 417         if (err == ENOTSUP) {
 418                 err = ELOOP;
 419         }
 420 #endif /* ENOTSUP */
 421 #ifdef EFTYPE
 422         /* fix broken NetBSD errno */
 423         if (err == EFTYPE) {
 424                 err = ELOOP;
 425         }
 426 #endif /* EFTYPE */
 427         /* fix broken FreeBSD errno */
 428         if (err == EMLINK) {
 429                 err = ELOOP;
 430         }
 431         return err;
 432 }
 433
 434 static int non_widelink_open(struct connection_struct *conn,
 435                         const struct smb_filename *conn_rootdir_fname,
 436                         files_struct *fsp,
 437                         struct smb_filename *smb_fname,
 438                         int flags,
 439                         mode_t mode,
 440                         unsigned int link_depth);
 441
 442 /****************************************************************************
 443  Follow a symlink in userspace.
 444 ****************************************************************************/
 445
 446 static int process_symlink_open(struct connection_struct *conn,
 447                         const struct smb_filename *conn_rootdir_fname,
 448                         files_struct *fsp,
 449                         struct smb_filename *smb_fname,
 450                         int flags,
 451                         mode_t mode,
 452                         unsigned int link_depth)
 453 {
 454         int fd = -1;
 455         char *link_target = NULL;
 456         struct smb_filename target_fname = {0};
 457         int link_len = -1;
 458         struct smb_filename *oldwd_fname = NULL;
 459         size_t rootdir_len = 0;
 460         struct smb_filename *resolved_fname = NULL;
 461         char *resolved_name = NULL;
 462         bool matched = false;
 463         int saved_errno = 0;
 464
 465         /*
 466          * Ensure we don't get stuck in a symlink loop.
 467          */
 468         link_depth++;
 469         if (link_depth >= 20) {
 470                 errno = ELOOP;
 471                 goto out;
 472         }
 473
 474         /* Allocate space for the link target. */
 475         link_target = talloc_array(talloc_tos(), char, PATH_MAX);
 476         if (link_target == NULL) {
 477                 errno = ENOMEM;
 478                 goto out;
 479         }
 480
 481         /* Read the link target. */
 482         link_len = SMB_VFS_READLINK(conn,
 483                                 smb_fname,
 484                                 link_target,
 485                                 PATH_MAX - 1);
 486         if (link_len == -1) {
 487                 goto out;
 488         }
 489
 490         /* Ensure it's at least null terminated. */
 491         link_target[link_len] = '\0';
 492         target_fname = (struct smb_filename){ .base_name = link_target };
 493
 494         /* Convert to an absolute path. */
 495         resolved_fname = SMB_VFS_REALPATH(conn, talloc_tos(), &target_fname);
 496         if (resolved_fname == NULL) {
 497                 goto out;
 498         }
 499         resolved_name = resolved_fname->base_name;
 500
 501         /*
 502          * We know conn_rootdir starts with '/' and
 503          * does not end in '/'. FIXME ! Should we
 504          * smb_assert this ?
 505          */
 506         rootdir_len = strlen(conn_rootdir_fname->base_name);
 507
 508         matched = (strncmp(conn_rootdir_fname->base_name,
 509                                 resolved_name,
 510                                 rootdir_len) == 0);
 511         if (!matched) {
 512                 errno = EACCES;
 513                 goto out;
 514         }
 515
 516         /*
 517          * Turn into a path relative to the share root.
 518          */
 519         if (resolved_name[rootdir_len] == '\0') {
 520                 /* Link to the root of the share. */
 521                 TALLOC_FREE(smb_fname->base_name);
 522                 smb_fname->base_name = talloc_strdup(smb_fname, ".");
 523         } else if (resolved_name[rootdir_len] == '/') {
 524                 TALLOC_FREE(smb_fname->base_name);
 525                 smb_fname->base_name = talloc_strdup(smb_fname,
 526                                         &resolved_name[rootdir_len+1]);
 527         } else {
 528                 errno = EACCES;
 529                 goto out;
 530         }
 531
 532         if (smb_fname->base_name == NULL) {
 533                 errno = ENOMEM;
 534                 goto out;
 535         }
 536
 537         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 538         if (oldwd_fname == NULL) {
 539                 goto out;
 540         }
 541
 542         /* Ensure we operate from the root of the share. */
 543         if (vfs_ChDir(conn, conn_rootdir_fname) == -1) {
 544                 goto out;
 545         }
 546
 547         /* And do it all again.. */
 548         fd = non_widelink_open(conn,
 549                                 conn_rootdir_fname,
 550                                 fsp,
 551                                 smb_fname,
 552                                 flags,
 553                                 mode,
 554                                 link_depth);
 555         if (fd == -1) {
 556                 saved_errno = errno;
 557         }
 558
 559   out:
 560
 561         TALLOC_FREE(resolved_fname);
 562         TALLOC_FREE(link_target);
 563         if (oldwd_fname != NULL) {
 564                 int ret = vfs_ChDir(conn, oldwd_fname);
 565                 if (ret == -1) {
 566                         smb_panic("unable to get back to old directory\n");
 567                 }
 568                 TALLOC_FREE(oldwd_fname);
 569         }
 570         if (saved_errno != 0) {
 571                 errno = saved_errno;
 572         }
 573         return fd;
 574 }
 575
 576 /****************************************************************************
 577  Non-widelink open.
 578 ****************************************************************************/
 579
 580 static int non_widelink_open(struct connection_struct *conn,
 581                         const struct smb_filename *conn_rootdir_fname,
 582                         files_struct *fsp,
 583                         struct smb_filename *smb_fname,
 584                         int flags,
 585                         mode_t mode,
 586                         unsigned int link_depth)
 587 {
 588         NTSTATUS status;
 589         int fd = -1;
 590         struct smb_filename *smb_fname_rel = NULL;
 591         int saved_errno = 0;
 592         struct smb_filename *oldwd_fname = NULL;
 593         char *parent_dir = NULL;
 594         struct smb_filename parent_dir_fname = {0};
 595         const char *final_component = NULL;
 596         bool is_directory = false;
 597         bool ok;
 598
 599 #ifdef O_DIRECTORY
 600         if (flags & O_DIRECTORY) {
 601                 is_directory = true;
 602         }
 603 #endif
 604
 605         if (is_directory) {
 606                 parent_dir = talloc_strdup(talloc_tos(), smb_fname->base_name);
 607                 if (parent_dir == NULL) {
 608                         saved_errno = errno;
 609                         goto out;
 610                 }
 611
 612                 final_component = ".";
 613         } else {
 614                 ok = parent_dirname(talloc_tos(),
 615                                     smb_fname->base_name,
 616                                     &parent_dir,
 617                                     &final_component);
 618                 if (!ok) {
 619                         saved_errno = errno;
 620                         goto out;
 621                 }
 622         }
 623
 624         parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
 625
 626         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 627         if (oldwd_fname == NULL) {
 628                 goto out;
 629         }
 630
 631         /* Pin parent directory in place. */
 632         if (vfs_ChDir(conn, &parent_dir_fname) == -1) {
 633                 goto out;
 634         }
 635
 636         smb_fname_rel = synthetic_smb_fname(talloc_tos(),
 637                                 final_component,
 638                                 smb_fname->stream_name,
 639                                 &smb_fname->st,
 640                                 smb_fname->flags);
 641         if (smb_fname_rel == NULL) {
 642                 saved_errno = ENOMEM;
 643                 goto out;
 644         }
 645
 646         /* Ensure the relative path is below the share. */
 647         status = check_reduced_name(conn, &parent_dir_fname, smb_fname_rel);
 648         if (!NT_STATUS_IS_OK(status)) {
 649                 saved_errno = map_errno_from_nt_status(status);
 650                 goto out;
 651         }
 652
 653         flags |= O_NOFOLLOW;
 654
 655         {
 656                 struct smb_filename *tmp_name = fsp->fsp_name;
 657                 fsp->fsp_name = smb_fname_rel;
 658                 fd = SMB_VFS_OPEN(conn, smb_fname_rel, fsp, flags, mode);
 659                 fsp->fsp_name = tmp_name;
 660         }
 661
 662         if (fd == -1) {
 663                 saved_errno = link_errno_convert(errno);
 664                 /*
 665                  * Trying to open a symlink to a directory with O_NOFOLLOW and
 666                  * O_DIRECTORY can return either of ELOOP and ENOTDIR. So
 667                  * ENOTDIR really means: might be a symlink, but we're not sure.
 668                  * In this case, we just assume there's a symlink. If we were
 669                  * wrong, process_symlink_open() will return EINVAL. We check
 670                  * this below, and fall back to returning the initial
 671                  * saved_errno.
 672                  *
 673                  * BUG: https://bugzilla.samba.org/show_bug.cgi?id=12860
 674                  */
 675                 if (saved_errno == ELOOP || saved_errno == ENOTDIR) {
 676                         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
 677                                 /* Never follow symlinks on posix open. */
 678                                 goto out;
 679                         }
 680                         if (!lp_follow_symlinks(SNUM(conn))) {
 681                                 /* Explicitly no symlinks. */
 682                                 goto out;
 683                         }
 684                         /*
 685                          * We may have a symlink. Follow in userspace
 686                          * to ensure it's under the share definition.
 687                          */
 688                         fd = process_symlink_open(conn,
 689                                         conn_rootdir_fname,
 690                                         fsp,
 691                                         smb_fname_rel,
 692                                         flags,
 693                                         mode,
 694                                         link_depth);
 695                         if (fd == -1) {
 696                                 if (saved_errno == ENOTDIR &&
 697                                                 errno == EINVAL) {
 698                                         /*
 699                                          * O_DIRECTORY on neither a directory,
 700                                          * nor a symlink. Just return
 701                                          * saved_errno from initial open()
 702                                          */
 703                                         goto out;
 704                                 }
 705                                 saved_errno =
 706                                         link_errno_convert(errno);
 707                         }
 708                 }
 709         }
 710
 711   out:
 712
 713         TALLOC_FREE(parent_dir);
 714         TALLOC_FREE(smb_fname_rel);
 715
 716         if (oldwd_fname != NULL) {
 717                 int ret = vfs_ChDir(conn, oldwd_fname);
 718                 if (ret == -1) {
 719                         smb_panic("unable to get back to old directory\n");
 720                 }
 721                 TALLOC_FREE(oldwd_fname);
 722         }
 723         if (saved_errno != 0) {
 724                 errno = saved_errno;
 725         }
 726         return fd;
 727 }
 728
 729 /****************************************************************************
 730  fd support routines - attempt to do a dos_open.
 731 ****************************************************************************/
 732
 733 NTSTATUS fd_open(struct connection_struct *conn,
 734                  files_struct *fsp,
 735                  int flags,
 736                  mode_t mode)
 737 {
 738         struct smb_filename *smb_fname = fsp->fsp_name;
 739         NTSTATUS status = NT_STATUS_OK;
 740
 741         /*
 742          * Never follow symlinks on a POSIX client. The
 743          * client should be doing this.
 744          */
 745
 746         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || !lp_follow_symlinks(SNUM(conn))) {
 747                 flags |= O_NOFOLLOW;
 748         }
 749
 750         /* Ensure path is below share definition. */
 751         if (!lp_widelinks(SNUM(conn))) {
 752                 struct smb_filename *conn_rootdir_fname = NULL;
 753                 const char *conn_rootdir = SMB_VFS_CONNECTPATH(conn,
 754                                                 smb_fname);
 755                 int saved_errno = 0;
 756
 757                 if (conn_rootdir == NULL) {
 758                         return NT_STATUS_NO_MEMORY;
 759                 }
 760                 conn_rootdir_fname = synthetic_smb_fname(talloc_tos(),
 761                                                 conn_rootdir,
 762                                                 NULL,
 763                                                 NULL,
 764                                                 0);
 765                 if (conn_rootdir_fname == NULL) {
 766                         return NT_STATUS_NO_MEMORY;
 767                 }
 768
 769                 /*
 770                  * Only follow symlinks within a share
 771                  * definition.
 772                  */
 773                 fsp->fh->fd = non_widelink_open(conn,
 774                                         conn_rootdir_fname,
 775                                         fsp,
 776                                         smb_fname,
 777                                         flags,
 778                                         mode,
 779                                         0);
 780                 if (fsp->fh->fd == -1) {
 781                         saved_errno = errno;
 782                 }
 783                 TALLOC_FREE(conn_rootdir_fname);
 784                 if (saved_errno != 0) {
 785                         errno = saved_errno;
 786                 }
 787         } else {
 788                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 789         }
 790
 791         if (fsp->fh->fd == -1) {
 792                 int posix_errno = link_errno_convert(errno);
 793                 status = map_nt_error_from_unix(posix_errno);
 794                 if (errno == EMFILE) {
 795                         static time_t last_warned = 0L;
 796
 797                         if (time((time_t *) NULL) > last_warned) {
 798                                 DEBUG(0,("Too many open files, unable "
 799                                         "to open more!  smbd's max "
 800                                         "open files = %d\n",
 801                                         lp_max_open_files()));
 802                                 last_warned = time((time_t *) NULL);
 803                         }
 804                 }
 805
 806         }
 807
 808         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 809                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 810                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 811
 812         return status;
 813 }
 814
 815 /****************************************************************************
 816  Close the file associated with a fsp.
 817 ****************************************************************************/
 818
 819 NTSTATUS fd_close(files_struct *fsp)
 820 {
 821         int ret;
 822
 823         if (fsp->dptr) {
 824                 dptr_CloseDir(fsp);
 825         }
 826         if (fsp->fh->fd == -1) {
 827                 return NT_STATUS_OK; /* What we used to call a stat open. */
 828         }
 829         if (fsp->fh->ref_count > 1) {
 830                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 831         }
 832
 833         ret = SMB_VFS_CLOSE(fsp);
 834         fsp->fh->fd = -1;
 835         if (ret == -1) {
 836                 return map_nt_error_from_unix(errno);
 837         }
 838         return NT_STATUS_OK;
 839 }
 840
 841 /****************************************************************************
 842  Change the ownership of a file to that of the parent directory.
 843  Do this by fd if possible.
 844 ****************************************************************************/
 845
 846 void change_file_owner_to_parent(connection_struct *conn,
 847                                         const char *inherit_from_dir,
 848                                         files_struct *fsp)
 849 {
 850         struct smb_filename *smb_fname_parent;
 851         int ret;
 852
 853         smb_fname_parent = synthetic_smb_fname(talloc_tos(),
 854                                         inherit_from_dir,
 855                                         NULL,
 856                                         NULL,
 857                                         0);
 858         if (smb_fname_parent == NULL) {
 859                 return;
 860         }
 861
 862         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 863         if (ret == -1) {
 864                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 865                          "directory %s. Error was %s\n",
 866                          smb_fname_str_dbg(smb_fname_parent),
 867                          strerror(errno)));
 868                 TALLOC_FREE(smb_fname_parent);
 869                 return;
 870         }
 871
 872         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 873                 /* Already this uid - no need to change. */
 874                 DEBUG(10,("change_file_owner_to_parent: file %s "
 875                         "is already owned by uid %d\n",
 876                         fsp_str_dbg(fsp),
 877                         (int)fsp->fsp_name->st.st_ex_uid ));
 878                 TALLOC_FREE(smb_fname_parent);
 879                 return;
 880         }
 881
 882         become_root();
 883         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 884         unbecome_root();
 885         if (ret == -1) {
 886                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 887                          "file %s to parent directory uid %u. Error "
 888                          "was %s\n", fsp_str_dbg(fsp),
 889                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 890                          strerror(errno) ));
 891         } else {
 892                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 893                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 894                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 895                 /* Ensure the uid entry is updated. */
 896                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 897         }
 898
 899         TALLOC_FREE(smb_fname_parent);
 900 }
 901
 902 static NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 903                                         const char *inherit_from_dir,
 904                                         struct smb_filename *smb_dname,
 905                                         SMB_STRUCT_STAT *psbuf)
 906 {
 907         struct smb_filename *smb_fname_parent;
 908         struct smb_filename *smb_fname_cwd = NULL;
 909         struct smb_filename *saved_dir_fname = NULL;
 910         TALLOC_CTX *ctx = talloc_tos();
 911         NTSTATUS status = NT_STATUS_OK;
 912         int ret;
 913
 914         smb_fname_parent = synthetic_smb_fname(ctx,
 915                                         inherit_from_dir,
 916                                         NULL,
 917                                         NULL,
 918                                         0);
 919         if (smb_fname_parent == NULL) {
 920                 return NT_STATUS_NO_MEMORY;
 921         }
 922
 923         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 924         if (ret == -1) {
 925                 status = map_nt_error_from_unix(errno);
 926                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 927                          "directory %s. Error was %s\n",
 928                          smb_fname_str_dbg(smb_fname_parent),
 929                          strerror(errno)));
 930                 goto out;
 931         }
 932
 933         /* We've already done an lstat into psbuf, and we know it's a
 934            directory. If we can cd into the directory and the dev/ino
 935            are the same then we can safely chown without races as
 936            we're locking the directory in place by being in it.  This
 937            should work on any UNIX (thanks tridge :-). JRA.
 938         */
 939
 940         saved_dir_fname = vfs_GetWd(ctx,conn);
 941         if (!saved_dir_fname) {
 942                 status = map_nt_error_from_unix(errno);
 943                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 944                          "current working directory. Error was %s\n",
 945                          strerror(errno)));
 946                 goto out;
 947         }
 948
 949         /* Chdir into the new path. */
 950         if (vfs_ChDir(conn, smb_dname) == -1) {
 951                 status = map_nt_error_from_unix(errno);
 952                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 953                          "current working directory to %s. Error "
 954                          "was %s\n", smb_dname->base_name, strerror(errno) ));
 955                 goto chdir;
 956         }
 957
 958         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL, 0);
 959         if (smb_fname_cwd == NULL) {
 960                 status = NT_STATUS_NO_MEMORY;
 961                 goto chdir;
 962         }
 963
 964         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 965         if (ret == -1) {
 966                 status = map_nt_error_from_unix(errno);
 967                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 968                          "directory '.' (%s) Error was %s\n",
 969                          smb_dname->base_name, strerror(errno)));
 970                 goto chdir;
 971         }
 972
 973         /* Ensure we're pointing at the same place. */
 974         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 975             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 976                 DEBUG(0,("change_dir_owner_to_parent: "
 977                          "device/inode on directory %s changed. "
 978                          "Refusing to chown !\n",
 979                         smb_dname->base_name ));
 980                 status = NT_STATUS_ACCESS_DENIED;
 981                 goto chdir;
 982         }
 983
 984         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 985                 /* Already this uid - no need to change. */
 986                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 987                         "is already owned by uid %d\n",
 988                         smb_dname->base_name,
 989                         (int)smb_fname_cwd->st.st_ex_uid ));
 990                 status = NT_STATUS_OK;
 991                 goto chdir;
 992         }
 993
 994         become_root();
 995         ret = SMB_VFS_LCHOWN(conn,
 996                         smb_fname_cwd,
 997                         smb_fname_parent->st.st_ex_uid,
 998                         (gid_t)-1);
 999         unbecome_root();
1000         if (ret == -1) {
1001                 status = map_nt_error_from_unix(errno);
1002                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
1003                           "directory %s to parent directory uid %u. "
1004                           "Error was %s\n",
1005                           smb_dname->base_name,
1006                           (unsigned int)smb_fname_parent->st.st_ex_uid,
1007                           strerror(errno) ));
1008         } else {
1009                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
1010                         "directory %s to parent directory uid %u.\n",
1011                         smb_dname->base_name,
1012                         (unsigned int)smb_fname_parent->st.st_ex_uid ));
1013                 /* Ensure the uid entry is updated. */
1014                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
1015         }
1016
1017  chdir:
1018         vfs_ChDir(conn, saved_dir_fname);
1019  out:
1020         TALLOC_FREE(saved_dir_fname);
1021         TALLOC_FREE(smb_fname_parent);
1022         TALLOC_FREE(smb_fname_cwd);
1023         return status;
1024 }
1025
1026 /****************************************************************************
1027  Open a file - returning a guaranteed ATOMIC indication of if the
1028  file was created or not.
1029 ****************************************************************************/
1030
1031 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
1032                         files_struct *fsp,
1033                         int flags,
1034                         mode_t mode,
1035                         bool *file_created)
1036 {
1037         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1038         NTSTATUS retry_status;
1039         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1040         int curr_flags;
1041
1042         *file_created = false;
1043
1044         if (!(flags & O_CREAT)) {
1045                 /*
1046                  * We're not creating the file, just pass through.
1047                  */
1048                 return fd_open(conn, fsp, flags, mode);
1049         }
1050
1051         if (flags & O_EXCL) {
1052                 /*
1053                  * Fail if already exists, just pass through.
1054                  */
1055                 status = fd_open(conn, fsp, flags, mode);
1056
1057                 /*
1058                  * Here we've opened with O_CREAT|O_EXCL. If that went
1059                  * NT_STATUS_OK, we *know* we created this file.
1060                  */
1061                 *file_created = NT_STATUS_IS_OK(status);
1062
1063                 return status;
1064         }
1065
1066         /*
1067          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
1068          * To know absolutely if we created the file or not,
1069          * we can never call O_CREAT without O_EXCL. So if
1070          * we think the file existed, try without O_CREAT|O_EXCL.
1071          * If we think the file didn't exist, try with
1072          * O_CREAT|O_EXCL.
1073          *
1074          * The big problem here is dangling symlinks. Opening
1075          * without O_NOFOLLOW means both bad symlink
1076          * and missing path return -1, ENOENT from open(). As POSIX
1077          * is pathname based it's not possible to tell
1078          * the difference between these two cases in a
1079          * non-racy way, so change to try only two attempts before
1080          * giving up.
1081          *
1082          * We don't have this problem for the O_NOFOLLOW
1083          * case as it just returns NT_STATUS_OBJECT_PATH_NOT_FOUND
1084          * mapped from the ELOOP POSIX error.
1085          */
1086
1087         curr_flags = flags;
1088
1089         if (file_existed) {
1090                 curr_flags &= ~(O_CREAT);
1091                 retry_status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1092         } else {
1093                 curr_flags |= O_EXCL;
1094                 retry_status = NT_STATUS_OBJECT_NAME_COLLISION;
1095         }
1096
1097         status = fd_open(conn, fsp, curr_flags, mode);
1098         if (NT_STATUS_IS_OK(status)) {
1099                 if (!file_existed) {
1100                         *file_created = true;
1101                 }
1102                 return NT_STATUS_OK;
1103         }
1104         if (!NT_STATUS_EQUAL(status, retry_status)) {
1105                 return status;
1106         }
1107
1108         curr_flags = flags;
1109
1110         /*
1111          * Keep file_existed up to date for clarity.
1112          */
1113         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1114                 file_existed = false;
1115                 curr_flags |= O_EXCL;
1116                 DBG_DEBUG("file %s did not exist. Retry.\n",
1117                         smb_fname_str_dbg(fsp->fsp_name));
1118         } else {
1119                 file_existed = true;
1120                 curr_flags &= ~(O_CREAT);
1121                 DBG_DEBUG("file %s existed. Retry.\n",
1122                         smb_fname_str_dbg(fsp->fsp_name));
1123         }
1124
1125         status = fd_open(conn, fsp, curr_flags, mode);
1126
1127         if (NT_STATUS_IS_OK(status) && (!file_existed)) {
1128                 *file_created = true;
1129         }
1130
1131         return status;
1132 }
1133
1134 /****************************************************************************
1135  Open a file.
1136 ****************************************************************************/
1137
1138 static NTSTATUS open_file(files_struct *fsp,
1139                           connection_struct *conn,
1140                           struct smb_request *req,
1141                           const char *parent_dir,
1142                           int flags,
1143                           mode_t unx_mode,
1144                           uint32_t access_mask, /* client requested access mask. */
1145                           uint32_t open_access_mask, /* what we're actually using in the open. */
1146                           bool *p_file_created)
1147 {
1148         struct smb_filename *smb_fname = fsp->fsp_name;
1149         NTSTATUS status = NT_STATUS_OK;
1150         int accmode = (flags & O_ACCMODE);
1151         int local_flags = flags;
1152         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1153
1154         fsp->fh->fd = -1;
1155         errno = EPERM;
1156
1157         /* Check permissions */
1158
1159         /*
1160          * This code was changed after seeing a client open request
1161          * containing the open mode of (DENY_WRITE/read-only) with
1162          * the 'create if not exist' bit set. The previous code
1163          * would fail to open the file read only on a read-only share
1164          * as it was checking the flags parameter  directly against O_RDONLY,
1165          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
1166          * JRA.
1167          */
1168
1169         if (!CAN_WRITE(conn)) {
1170                 /* It's a read-only share - fail if we wanted to write. */
1171                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
1172                         DEBUG(3,("Permission denied opening %s\n",
1173                                  smb_fname_str_dbg(smb_fname)));
1174                         return NT_STATUS_ACCESS_DENIED;
1175                 }
1176                 if (flags & O_CREAT) {
1177                         /* We don't want to write - but we must make sure that
1178                            O_CREAT doesn't create the file if we have write
1179                            access into the directory.
1180                         */
1181                         flags &= ~(O_CREAT|O_EXCL);
1182                         local_flags &= ~(O_CREAT|O_EXCL);
1183                 }
1184         }
1185
1186         /*
1187          * This little piece of insanity is inspired by the
1188          * fact that an NT client can open a file for O_RDONLY,
1189          * but set the create disposition to FILE_EXISTS_TRUNCATE.
1190          * If the client *can* write to the file, then it expects to
1191          * truncate the file, even though it is opening for readonly.
1192          * Quicken uses this stupid trick in backup file creation...
1193          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
1194          * for helping track this one down. It didn't bite us in 2.0.x
1195          * as we always opened files read-write in that release. JRA.
1196          */
1197
1198         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
1199                 DEBUG(10,("open_file: truncate requested on read-only open "
1200                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
1201                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
1202         }
1203
1204         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
1205             (!file_existed && (local_flags & O_CREAT)) ||
1206             ((local_flags & O_TRUNC) == O_TRUNC) ) {
1207                 const char *wild;
1208                 int ret;
1209
1210 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
1211                 /*
1212                  * We would block on opening a FIFO with no one else on the
1213                  * other end. Do what we used to do and add O_NONBLOCK to the
1214                  * open flags. JRA.
1215                  */
1216
1217                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
1218                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
1219                         local_flags |= O_NONBLOCK;
1220                 }
1221 #endif
1222
1223                 /* Don't create files with Microsoft wildcard characters. */
1224                 if (fsp->base_fsp) {
1225                         /*
1226                          * wildcard characters are allowed in stream names
1227                          * only test the basefilename
1228                          */
1229                         wild = fsp->base_fsp->fsp_name->base_name;
1230                 } else {
1231                         wild = smb_fname->base_name;
1232                 }
1233                 if ((local_flags & O_CREAT) && !file_existed &&
1234                     !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
1235                     ms_has_wild(wild))  {
1236                         return NT_STATUS_OBJECT_NAME_INVALID;
1237                 }
1238
1239                 /* Can we access this file ? */
1240                 if (!fsp->base_fsp) {
1241                         /* Only do this check on non-stream open. */
1242                         if (file_existed) {
1243                                 status = smbd_check_access_rights(conn,
1244                                                 smb_fname,
1245                                                 false,
1246                                                 access_mask);
1247
1248                                 if (!NT_STATUS_IS_OK(status)) {
1249                                         DEBUG(10, ("open_file: "
1250                                                    "smbd_check_access_rights "
1251                                                    "on file %s returned %s\n",
1252                                                    smb_fname_str_dbg(smb_fname),
1253                                                    nt_errstr(status)));
1254                                 }
1255
1256                                 if (!NT_STATUS_IS_OK(status) &&
1257                                     !NT_STATUS_EQUAL(status,
1258                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1259                                 {
1260                                         return status;
1261                                 }
1262
1263                                 if (NT_STATUS_EQUAL(status,
1264                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1265                                 {
1266                                         DEBUG(10, ("open_file: "
1267                                                 "file %s vanished since we "
1268                                                 "checked for existence.\n",
1269                                                 smb_fname_str_dbg(smb_fname)));
1270                                         file_existed = false;
1271                                         SET_STAT_INVALID(fsp->fsp_name->st);
1272                                 }
1273                         }
1274
1275                         if (!file_existed) {
1276                                 if (!(local_flags & O_CREAT)) {
1277                                         /* File didn't exist and no O_CREAT. */
1278                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1279                                 }
1280
1281                                 status = check_parent_access(conn,
1282                                                              smb_fname,
1283                                                              SEC_DIR_ADD_FILE);
1284                                 if (!NT_STATUS_IS_OK(status)) {
1285                                         DEBUG(10, ("open_file: "
1286                                                    "check_parent_access on "
1287                                                    "file %s returned %s\n",
1288                                                    smb_fname_str_dbg(smb_fname),
1289                                                    nt_errstr(status) ));
1290                                         return status;
1291                                 }
1292                         }
1293                 }
1294
1295                 /*
1296                  * Actually do the open - if O_TRUNC is needed handle it
1297                  * below under the share mode lock.
1298                  */
1299                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
1300                                 unx_mode, p_file_created);
1301                 if (!NT_STATUS_IS_OK(status)) {
1302                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
1303                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
1304                                  nt_errstr(status),local_flags,flags));
1305                         return status;
1306                 }
1307
1308                 if (local_flags & O_NONBLOCK) {
1309                         /*
1310                          * GPFS can return ETIMEDOUT for pread on
1311                          * nonblocking file descriptors when files
1312                          * migrated to tape need to be recalled. I
1313                          * could imagine this happens elsehwere
1314                          * too. With blocking file descriptors this
1315                          * does not happen.
1316                          */
1317                         ret = set_blocking(fsp->fh->fd, true);
1318                         if (ret == -1) {
1319                                 status = map_nt_error_from_unix(errno);
1320                                 DBG_WARNING("Could not set fd to blocking: "
1321                                             "%s\n", strerror(errno));
1322                                 fd_close(fsp);
1323                                 return status;
1324                         }
1325                 }
1326
1327                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1328                 if (ret == -1) {
1329                         /* If we have an fd, this stat should succeed. */
1330                         DEBUG(0,("Error doing fstat on open file %s "
1331                                 "(%s)\n",
1332                                 smb_fname_str_dbg(smb_fname),
1333                                 strerror(errno) ));
1334                         status = map_nt_error_from_unix(errno);
1335                         fd_close(fsp);
1336                         return status;
1337                 }
1338
1339                 if (*p_file_created) {
1340                         /* We created this file. */
1341
1342                         bool need_re_stat = false;
1343                         /* Do all inheritance work after we've
1344                            done a successful fstat call and filled
1345                            in the stat struct in fsp->fsp_name. */
1346
1347                         /* Inherit the ACL if required */
1348                         if (lp_inherit_permissions(SNUM(conn))) {
1349                                 inherit_access_posix_acl(conn, parent_dir,
1350                                                          smb_fname,
1351                                                          unx_mode);
1352                                 need_re_stat = true;
1353                         }
1354
1355                         /* Change the owner if required. */
1356                         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
1357                                 change_file_owner_to_parent(conn, parent_dir,
1358                                                             fsp);
1359                                 need_re_stat = true;
1360                         }
1361
1362                         if (need_re_stat) {
1363                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1364                                 /* If we have an fd, this stat should succeed. */
1365                                 if (ret == -1) {
1366                                         DEBUG(0,("Error doing fstat on open file %s "
1367                                                  "(%s)\n",
1368                                                  smb_fname_str_dbg(smb_fname),
1369                                                  strerror(errno) ));
1370                                 }
1371                         }
1372
1373                         notify_fname(conn, NOTIFY_ACTION_ADDED,
1374                                      FILE_NOTIFY_CHANGE_FILE_NAME,
1375                                      smb_fname->base_name);
1376                 }
1377         } else {
1378                 fsp->fh->fd = -1; /* What we used to call a stat open. */
1379                 if (!file_existed) {
1380                         /* File must exist for a stat open. */
1381                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1382                 }
1383
1384                 status = smbd_check_access_rights(conn,
1385                                 smb_fname,
1386                                 false,
1387                                 access_mask);
1388
1389                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1390                                 (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) &&
1391                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
1392                         /* This is a POSIX stat open for delete
1393                          * or rename on a symlink that points
1394                          * nowhere. Allow. */
1395                         DEBUG(10,("open_file: allowing POSIX "
1396                                   "open on bad symlink %s\n",
1397                                   smb_fname_str_dbg(smb_fname)));
1398                         status = NT_STATUS_OK;
1399                 }
1400
1401                 if (!NT_STATUS_IS_OK(status)) {
1402                         DEBUG(10,("open_file: "
1403                                 "smbd_check_access_rights on file "
1404                                 "%s returned %s\n",
1405                                 smb_fname_str_dbg(smb_fname),
1406                                 nt_errstr(status) ));
1407                         return status;
1408                 }
1409         }
1410
1411         /*
1412          * POSIX allows read-only opens of directories. We don't
1413          * want to do this (we use a different code path for this)
1414          * so catch a directory open and return an EISDIR. JRA.
1415          */
1416
1417         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1418                 fd_close(fsp);
1419                 errno = EISDIR;
1420                 return NT_STATUS_FILE_IS_A_DIRECTORY;
1421         }
1422
1423         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
1424         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
1425         fsp->file_pid = req ? req->smbpid : 0;
1426         fsp->can_lock = True;
1427         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
1428         fsp->can_write =
1429                 CAN_WRITE(conn) &&
1430                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
1431         fsp->print_file = NULL;
1432         fsp->modified = False;
1433         fsp->sent_oplock_break = NO_BREAK_SENT;
1434         fsp->is_directory = False;
1435         if (conn->aio_write_behind_list &&
1436             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
1437                        conn->case_sensitive)) {
1438                 fsp->aio_write_behind = True;
1439         }
1440
1441         fsp->wcp = NULL; /* Write cache pointer. */
1442
1443         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1444                  conn->session_info->unix_info->unix_name,
1445                  smb_fname_str_dbg(smb_fname),
1446                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1447                  conn->num_files_open));
1448
1449         errno = 0;
1450         return NT_STATUS_OK;
1451 }
1452
1453 /****************************************************************************
1454  Check if we can open a file with a share mode.
1455  Returns True if conflict, False if not.
1456 ****************************************************************************/
1457
1458 static bool share_conflict(struct share_mode_entry *entry,
1459                            uint32_t access_mask,
1460                            uint32_t share_access)
1461 {
1462         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1463                   "entry->share_access = 0x%x, "
1464                   "entry->private_options = 0x%x\n",
1465                   (unsigned int)entry->access_mask,
1466                   (unsigned int)entry->share_access,
1467                   (unsigned int)entry->private_options));
1468
1469         if (server_id_is_disconnected(&entry->pid)) {
1470                 /*
1471                  * note: cleanup should have been done by
1472                  * delay_for_batch_oplocks()
1473                  */
1474                 return false;
1475         }
1476
1477         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1478                   (unsigned int)access_mask, (unsigned int)share_access));
1479
1480         if ((entry->access_mask & (FILE_WRITE_DATA|
1481                                    FILE_APPEND_DATA|
1482                                    FILE_READ_DATA|
1483                                    FILE_EXECUTE|
1484                                    DELETE_ACCESS)) == 0) {
1485                 DEBUG(10,("share_conflict: No conflict due to "
1486                           "entry->access_mask = 0x%x\n",
1487                           (unsigned int)entry->access_mask ));
1488                 return False;
1489         }
1490
1491         if ((access_mask & (FILE_WRITE_DATA|
1492                             FILE_APPEND_DATA|
1493                             FILE_READ_DATA|
1494                             FILE_EXECUTE|
1495                             DELETE_ACCESS)) == 0) {
1496                 DEBUG(10,("share_conflict: No conflict due to "
1497                           "access_mask = 0x%x\n",
1498                           (unsigned int)access_mask ));
1499                 return False;
1500         }
1501
1502 #if 1 /* JRA TEST - Superdebug. */
1503 #define CHECK_MASK(num, am, right, sa, share) \
1504         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1505                 (unsigned int)(num), (unsigned int)(am), \
1506                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1507         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1508                 (unsigned int)(num), (unsigned int)(sa), \
1509                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1510         if (((am) & (right)) && !((sa) & (share))) { \
1511                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1512 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1513                         (unsigned int)(share) )); \
1514                 return True; \
1515         }
1516 #else
1517 #define CHECK_MASK(num, am, right, sa, share) \
1518         if (((am) & (right)) && !((sa) & (share))) { \
1519                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1520 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1521                         (unsigned int)(share) )); \
1522                 return True; \
1523         }
1524 #endif
1525
1526         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1527                    share_access, FILE_SHARE_WRITE);
1528         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1529                    entry->share_access, FILE_SHARE_WRITE);
1530
1531         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1532                    share_access, FILE_SHARE_READ);
1533         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1534                    entry->share_access, FILE_SHARE_READ);
1535
1536         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1537                    share_access, FILE_SHARE_DELETE);
1538         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1539                    entry->share_access, FILE_SHARE_DELETE);
1540
1541         DEBUG(10,("share_conflict: No conflict.\n"));
1542         return False;
1543 }
1544
1545 #if defined(DEVELOPER)
1546 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1547                                       const struct file_id id,
1548                                       int num,
1549                                       struct share_mode_entry *share_entry)
1550 {
1551         struct server_id self = messaging_server_id(sconn->msg_ctx);
1552         files_struct *fsp;
1553
1554         if (!serverid_equal(&self, &share_entry->pid)) {
1555                 return;
1556         }
1557
1558         if (share_entry->op_mid == 0) {
1559                 /* INTERNAL_OPEN_ONLY */
1560                 return;
1561         }
1562
1563         if (!is_valid_share_mode_entry(share_entry)) {
1564                 return;
1565         }
1566
1567         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1568         if (!fsp) {
1569                 DBG_ERR("PANIC : %s\n",
1570                         share_mode_str(talloc_tos(), num, &id,
1571                                        share_entry));
1572                 smb_panic("validate_my_share_entries: Cannot match a "
1573                           "share entry with an open file\n");
1574         }
1575
1576         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1577                 goto panic;
1578         }
1579
1580         return;
1581
1582  panic:
1583         {
1584                 char *str;
1585                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1586                         share_mode_str(talloc_tos(), num, &id,
1587                                        share_entry));
1588                 str = talloc_asprintf(talloc_tos(),
1589                         "validate_my_share_entries: "
1590                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1591                          fsp->fsp_name->base_name,
1592                          (unsigned int)fsp->oplock_type,
1593                          (unsigned int)share_entry->op_type );
1594                 smb_panic(str);
1595         }
1596 }
1597 #endif
1598
1599 bool is_stat_open(uint32_t access_mask)
1600 {
1601         const uint32_t stat_open_bits =
1602                 (SYNCHRONIZE_ACCESS|
1603                  FILE_READ_ATTRIBUTES|
1604                  FILE_WRITE_ATTRIBUTES);
1605
1606         return (((access_mask &  stat_open_bits) != 0) &&
1607                 ((access_mask & ~stat_open_bits) == 0));
1608 }
1609
1610 static bool has_delete_on_close(struct share_mode_lock *lck,
1611                                 uint32_t name_hash)
1612 {
1613         struct share_mode_data *d = lck->data;
1614         uint32_t i;
1615
1616         if (d->num_share_modes == 0) {
1617                 return false;
1618         }
1619         if (!is_delete_on_close_set(lck, name_hash)) {
1620                 return false;
1621         }
1622         for (i=0; i<d->num_share_modes; i++) {
1623                 if (!share_mode_stale_pid(d, i)) {
1624                         return true;
1625                 }
1626         }
1627         return false;
1628 }
1629
1630 /****************************************************************************
1631  Deal with share modes
1632  Invariant: Share mode must be locked on entry and exit.
1633  Returns -1 on error, or number of share modes on success (may be zero).
1634 ****************************************************************************/
1635
1636 static NTSTATUS open_mode_check(connection_struct *conn,
1637                                 struct share_mode_lock *lck,
1638                                 uint32_t access_mask,
1639                                 uint32_t share_access)
1640 {
1641         uint32_t i;
1642
1643         if(lck->data->num_share_modes == 0) {
1644                 return NT_STATUS_OK;
1645         }
1646
1647         if (is_stat_open(access_mask)) {
1648                 /* Stat open that doesn't trigger oplock breaks or share mode
1649                  * checks... ! JRA. */
1650                 return NT_STATUS_OK;
1651         }
1652
1653         /*
1654          * Check if the share modes will give us access.
1655          */
1656
1657 #if defined(DEVELOPER)
1658         for(i = 0; i < lck->data->num_share_modes; i++) {
1659                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1660                                           &lck->data->share_modes[i]);
1661         }
1662 #endif
1663
1664         /* Now we check the share modes, after any oplock breaks. */
1665         for(i = 0; i < lck->data->num_share_modes; i++) {
1666
1667                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1668                         continue;
1669                 }
1670
1671                 /* someone else has a share lock on it, check to see if we can
1672                  * too */
1673                 if (share_conflict(&lck->data->share_modes[i],
1674                                    access_mask, share_access)) {
1675
1676                         if (share_mode_stale_pid(lck->data, i)) {
1677                                 continue;
1678                         }
1679
1680                         return NT_STATUS_SHARING_VIOLATION;
1681                 }
1682         }
1683
1684         return NT_STATUS_OK;
1685 }
1686
1687 /*
1688  * Send a break message to the oplock holder and delay the open for
1689  * our client.
1690  */
1691
1692 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1693                             const struct file_id *id,
1694                             const struct share_mode_entry *exclusive,
1695                             uint16_t break_to)
1696 {
1697         NTSTATUS status;
1698         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1699         struct server_id_buf tmp;
1700
1701         DEBUG(10, ("Sending break request to PID %s\n",
1702                    server_id_str_buf(exclusive->pid, &tmp)));
1703
1704         /* Create the message. */
1705         share_mode_entry_to_message(msg, id, exclusive);
1706
1707         /* Overload entry->op_type */
1708         /*
1709          * This is a cut from uint32_t to uint16_t, but so far only the lower 3
1710          * bits (LEASE_WRITE/HANDLE/READ are used anyway.
1711          */
1712         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1713
1714         status = messaging_send_buf(msg_ctx, exclusive->pid,
1715                                     MSG_SMB_BREAK_REQUEST,
1716                                     (uint8_t *)msg, sizeof(msg));
1717         if (!NT_STATUS_IS_OK(status)) {
1718                 DEBUG(3, ("Could not send oplock break message: %s\n",
1719                           nt_errstr(status)));
1720         }
1721
1722         return status;
1723 }
1724
1725 /*
1726  * Do internal consistency checks on the share mode for a file.
1727  */
1728
1729 static bool validate_oplock_types(struct share_mode_lock *lck)
1730 {
1731         struct share_mode_data *d = lck->data;
1732         bool batch = false;
1733         bool ex_or_batch = false;
1734         bool level2 = false;
1735         bool no_oplock = false;
1736         uint32_t num_non_stat_opens = 0;
1737         uint32_t i;
1738
1739         for (i=0; i<d->num_share_modes; i++) {
1740                 struct share_mode_entry *e = &d->share_modes[i];
1741
1742                 if (!is_valid_share_mode_entry(e)) {
1743                         continue;
1744                 }
1745
1746                 if (e->op_mid == 0) {
1747                         /* INTERNAL_OPEN_ONLY */
1748                         continue;
1749                 }
1750
1751                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1752                         /* We ignore stat opens in the table - they
1753                            always have NO_OPLOCK and never get or
1754                            cause breaks. JRA. */
1755                         continue;
1756                 }
1757
1758                 num_non_stat_opens += 1;
1759
1760                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1761                         /* batch - can only be one. */
1762                         if (share_mode_stale_pid(d, i)) {
1763                                 DEBUG(10, ("Found stale batch oplock\n"));
1764                                 continue;
1765                         }
1766                         if (ex_or_batch || batch || level2 || no_oplock) {
1767                                 DEBUG(0, ("Bad batch oplock entry %u.",
1768                                           (unsigned)i));
1769                                 return false;
1770                         }
1771                         batch = true;
1772                 }
1773
1774                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1775                         if (share_mode_stale_pid(d, i)) {
1776                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1777                                 continue;
1778                         }
1779                         /* Exclusive or batch - can only be one. */
1780                         if (ex_or_batch || level2 || no_oplock) {
1781                                 DEBUG(0, ("Bad exclusive or batch oplock "
1782                                           "entry %u.", (unsigned)i));
1783                                 return false;
1784                         }
1785                         ex_or_batch = true;
1786                 }
1787
1788                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1789                         if (batch || ex_or_batch) {
1790                                 if (share_mode_stale_pid(d, i)) {
1791                                         DEBUG(10, ("Found stale LevelII "
1792                                                    "oplock\n"));
1793                                         continue;
1794                                 }
1795                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1796                                           (unsigned)i));
1797                                 return false;
1798                         }
1799                         level2 = true;
1800                 }
1801
1802                 if (e->op_type == NO_OPLOCK) {
1803                         if (batch || ex_or_batch) {
1804                                 if (share_mode_stale_pid(d, i)) {
1805                                         DEBUG(10, ("Found stale NO_OPLOCK "
1806                                                    "entry\n"));
1807                                         continue;
1808                                 }
1809                                 DEBUG(0, ("Bad no oplock entry %u.",
1810                                           (unsigned)i));
1811                                 return false;
1812                         }
1813                         no_oplock = true;
1814                 }
1815         }
1816
1817         remove_stale_share_mode_entries(d);
1818
1819         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1820                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1821                           (int)batch, (int)ex_or_batch,
1822                           (int)d->num_share_modes));
1823                 return false;
1824         }
1825
1826         return true;
1827 }
1828
1829 static bool delay_for_oplock(files_struct *fsp,
1830                              int oplock_request,
1831                              const struct smb2_lease *lease,
1832                              struct share_mode_lock *lck,
1833                              bool have_sharing_violation,
1834                              uint32_t create_disposition,
1835                              bool first_open_attempt)
1836 {
1837         struct share_mode_data *d = lck->data;
1838         uint32_t i;
1839         bool delay = false;
1840         bool will_overwrite;
1841
1842         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1843             is_stat_open(fsp->access_mask)) {
1844                 return false;
1845         }
1846
1847         switch (create_disposition) {
1848         case FILE_SUPERSEDE:
1849         case FILE_OVERWRITE:
1850         case FILE_OVERWRITE_IF:
1851                 will_overwrite = true;
1852                 break;
1853         default:
1854                 will_overwrite = false;
1855                 break;
1856         }
1857
1858         for (i=0; i<d->num_share_modes; i++) {
1859                 struct share_mode_entry *e = &d->share_modes[i];
1860                 struct share_mode_lease *l = NULL;
1861                 uint32_t e_lease_type = get_lease_type(d, e);
1862                 uint32_t break_to;
1863                 uint32_t delay_mask = 0;
1864
1865                 if (e->op_type == LEASE_OPLOCK) {
1866                         l = &d->leases[e->lease_idx];
1867                 }
1868
1869                 if (have_sharing_violation) {
1870                         delay_mask = SMB2_LEASE_HANDLE;
1871                 } else {
1872                         delay_mask = SMB2_LEASE_WRITE;
1873                 }
1874
1875                 break_to = e_lease_type & ~delay_mask;
1876
1877                 if (will_overwrite) {
1878                         /*
1879                          * we'll decide about SMB2_LEASE_READ later.
1880                          *
1881                          * Maybe the break will be deferred
1882                          */
1883                         break_to &= ~SMB2_LEASE_HANDLE;
1884                 }
1885
1886                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1887                            (unsigned)i, (unsigned)e_lease_type,
1888                            (unsigned)will_overwrite));
1889
1890                 if (lease != NULL && l != NULL) {
1891                         bool ign;
1892
1893                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1894                                                &lease->lease_key,
1895                                                &l->client_guid,
1896                                                &l->lease_key);
1897                         if (ign) {
1898                                 continue;
1899                         }
1900                 }
1901
1902                 if ((e_lease_type & ~break_to) == 0) {
1903                         if (l != NULL && l->breaking) {
1904                                 delay = true;
1905                         }
1906                         continue;
1907                 }
1908
1909                 if (share_mode_stale_pid(d, i)) {
1910                         continue;
1911                 }
1912
1913                 if (will_overwrite) {
1914                         /*
1915                          * If we break anyway break to NONE directly.
1916                          * Otherwise vfs_set_filelen() will trigger the
1917                          * break.
1918                          */
1919                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1920                 }
1921
1922                 if (e->op_type != LEASE_OPLOCK) {
1923                         /*
1924                          * Oplocks only support breaking to R or NONE.
1925                          */
1926                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1927                 }
1928
1929                 DEBUG(10, ("breaking from %d to %d\n",
1930                            (int)e_lease_type, (int)break_to));
1931                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1932                                    e, break_to);
1933                 if (e_lease_type & delay_mask) {
1934                         delay = true;
1935                 }
1936                 if (l != NULL && l->breaking && !first_open_attempt) {
1937                         delay = true;
1938                 }
1939                 continue;
1940         }
1941
1942         return delay;
1943 }
1944
1945 static bool file_has_brlocks(files_struct *fsp)
1946 {
1947         struct byte_range_lock *br_lck;
1948
1949         br_lck = brl_get_locks_readonly(fsp);
1950         if (!br_lck)
1951                 return false;
1952
1953         return (brl_num_locks(br_lck) > 0);
1954 }
1955
1956 int find_share_mode_lease(struct share_mode_data *d,
1957                           const struct GUID *client_guid,
1958                           const struct smb2_lease_key *key)
1959 {
1960         uint32_t i;
1961
1962         for (i=0; i<d->num_leases; i++) {
1963                 struct share_mode_lease *l = &d->leases[i];
1964
1965                 if (smb2_lease_equal(client_guid,
1966                                      key,
1967                                      &l->client_guid,
1968                                      &l->lease_key)) {
1969                         return i;
1970                 }
1971         }
1972
1973         return -1;
1974 }
1975
1976 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1977                                  const struct smb2_lease_key *key,
1978                                  const struct share_mode_lease *l)
1979 {
1980         struct files_struct *fsp;
1981
1982         /*
1983          * TODO: Measure how expensive this loop is with thousands of open
1984          * handles...
1985          */
1986
1987         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1988              fsp != NULL;
1989              fsp = file_find_di_next(fsp)) {
1990
1991                 if (fsp == new_fsp) {
1992                         continue;
1993                 }
1994                 if (fsp->oplock_type != LEASE_OPLOCK) {
1995                         continue;
1996                 }
1997                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
1998                         fsp->lease->ref_count += 1;
1999                         return fsp->lease;
2000                 }
2001         }
2002
2003         /* Not found - must be leased in another smbd. */
2004         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2005         if (new_fsp->lease == NULL) {
2006                 return NULL;
2007         }
2008         new_fsp->lease->ref_count = 1;
2009         new_fsp->lease->sconn = new_fsp->conn->sconn;
2010         new_fsp->lease->lease.lease_key = *key;
2011         new_fsp->lease->lease.lease_state = l->current_state;
2012         /*
2013          * We internally treat all leases as V2 and update
2014          * the epoch, but when sending breaks it matters if
2015          * the requesting lease was v1 or v2.
2016          */
2017         new_fsp->lease->lease.lease_version = l->lease_version;
2018         new_fsp->lease->lease.lease_epoch = l->epoch;
2019         return new_fsp->lease;
2020 }
2021
2022 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2023                                 struct share_mode_lock *lck,
2024                                 const struct smb2_lease *lease,
2025                                 uint32_t *p_lease_idx,
2026                                 uint32_t granted)
2027 {
2028         struct share_mode_data *d = lck->data;
2029         const struct GUID *client_guid = fsp_client_guid(fsp);
2030         struct share_mode_lease *tmp;
2031         NTSTATUS status;
2032         int idx;
2033
2034         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2035
2036         if (idx != -1) {
2037                 struct share_mode_lease *l = &d->leases[idx];
2038                 bool do_upgrade;
2039                 uint32_t existing, requested;
2040
2041                 fsp->lease = find_fsp_lease(fsp, &lease->lease_key, l);
2042                 if (fsp->lease == NULL) {
2043                         DEBUG(1, ("Did not find existing lease for file %s\n",
2044                                   fsp_str_dbg(fsp)));
2045                         return NT_STATUS_NO_MEMORY;
2046                 }
2047
2048                 *p_lease_idx = idx;
2049
2050                 /*
2051                  * Upgrade only if the requested lease is a strict upgrade.
2052                  */
2053                 existing = l->current_state;
2054                 requested = lease->lease_state;
2055
2056                 /*
2057                  * Tricky: This test makes sure that "requested" is a
2058                  * strict bitwise superset of "existing".
2059                  */
2060                 do_upgrade = ((existing & requested) == existing);
2061
2062                 /*
2063                  * Upgrade only if there's a change.
2064                  */
2065                 do_upgrade &= (granted != existing);
2066
2067                 /*
2068                  * Upgrade only if other leases don't prevent what was asked
2069                  * for.
2070                  */
2071                 do_upgrade &= (granted == requested);
2072
2073                 /*
2074                  * only upgrade if we are not in breaking state
2075                  */
2076                 do_upgrade &= !l->breaking;
2077
2078                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2079                            "granted=%"PRIu32", do_upgrade=%d\n",
2080                            existing, requested, granted, (int)do_upgrade));
2081
2082                 if (do_upgrade) {
2083                         l->current_state = granted;
2084                         l->epoch += 1;
2085                 }
2086
2087                 /* Ensure we're in sync with current lease state. */
2088                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2089                 return NT_STATUS_OK;
2090         }
2091
2092         /*
2093          * Create new lease
2094          */
2095
2096         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2097                              d->num_leases+1);
2098         if (tmp == NULL) {
2099                 /*
2100                  * See [MS-SMB2]
2101                  */
2102                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2103         }
2104         d->leases = tmp;
2105
2106         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2107         if (fsp->lease == NULL) {
2108                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2109         }
2110         fsp->lease->ref_count = 1;
2111         fsp->lease->sconn = fsp->conn->sconn;
2112         fsp->lease->lease.lease_version = lease->lease_version;
2113         fsp->lease->lease.lease_key = lease->lease_key;
2114         fsp->lease->lease.lease_state = granted;
2115         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2116
2117         *p_lease_idx = d->num_leases;
2118
2119         d->leases[d->num_leases] = (struct share_mode_lease) {
2120                 .client_guid = *client_guid,
2121                 .lease_key = fsp->lease->lease.lease_key,
2122                 .current_state = fsp->lease->lease.lease_state,
2123                 .lease_version = fsp->lease->lease.lease_version,
2124                 .epoch = fsp->lease->lease.lease_epoch,
2125         };
2126
2127         status = leases_db_add(client_guid,
2128                                &lease->lease_key,
2129                                &fsp->file_id,
2130                                fsp->conn->connectpath,
2131                                fsp->fsp_name->base_name,
2132                                fsp->fsp_name->stream_name);
2133         if (!NT_STATUS_IS_OK(status)) {
2134                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2135                            nt_errstr(status)));
2136                 TALLOC_FREE(fsp->lease);
2137                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2138         }
2139
2140         d->num_leases += 1;
2141         d->modified = true;
2142
2143         return NT_STATUS_OK;
2144 }
2145
2146 static bool is_same_lease(const files_struct *fsp,
2147                           const struct share_mode_data *d,
2148                           const struct share_mode_entry *e,
2149                           const struct smb2_lease *lease)
2150 {
2151         if (e->op_type != LEASE_OPLOCK) {
2152                 return false;
2153         }
2154         if (lease == NULL) {
2155                 return false;
2156         }
2157
2158         return smb2_lease_equal(fsp_client_guid(fsp),
2159                                 &lease->lease_key,
2160                                 &d->leases[e->lease_idx].client_guid,
2161                                 &d->leases[e->lease_idx].lease_key);
2162 }
2163
2164 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2165                                       struct files_struct *fsp,
2166                                       struct share_mode_lock *lck,
2167                                       int oplock_request,
2168                                       struct smb2_lease *lease)
2169 {
2170         struct share_mode_data *d = lck->data;
2171         bool got_handle_lease = false;
2172         bool got_oplock = false;
2173         uint32_t i;
2174         uint32_t granted;
2175         uint32_t lease_idx = UINT32_MAX;
2176         bool ok;
2177         NTSTATUS status;
2178
2179         if (oplock_request & INTERNAL_OPEN_ONLY) {
2180                 /* No oplocks on internal open. */
2181                 oplock_request = NO_OPLOCK;
2182                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2183                         fsp->oplock_type, fsp_str_dbg(fsp)));
2184         }
2185
2186         if (oplock_request == LEASE_OPLOCK) {
2187                 if (lease == NULL) {
2188                         /*
2189                          * The SMB2 layer should have checked this
2190                          */
2191                         return NT_STATUS_INTERNAL_ERROR;
2192                 }
2193
2194                 granted = lease->lease_state;
2195
2196                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2197                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2198                         granted = SMB2_LEASE_NONE;
2199                 }
2200                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2201                         DEBUG(10, ("No read or write lease requested\n"));
2202                         granted = SMB2_LEASE_NONE;
2203                 }
2204                 if (granted == SMB2_LEASE_WRITE) {
2205                         DEBUG(10, ("pure write lease requested\n"));
2206                         granted = SMB2_LEASE_NONE;
2207                 }
2208                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2209                         DEBUG(10, ("write and handle lease requested\n"));
2210                         granted = SMB2_LEASE_NONE;
2211                 }
2212         } else {
2213                 granted = map_oplock_to_lease_type(
2214                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2215         }
2216
2217         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2218                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2219                         fsp_str_dbg(fsp)));
2220                 granted &= ~SMB2_LEASE_READ;
2221         }
2222
2223         for (i=0; i<d->num_share_modes; i++) {
2224                 struct share_mode_entry *e = &d->share_modes[i];
2225                 uint32_t e_lease_type;
2226
2227                 e_lease_type = get_lease_type(d, e);
2228
2229                 if ((granted & SMB2_LEASE_WRITE) &&
2230                     !is_same_lease(fsp, d, e, lease) &&
2231                     !share_mode_stale_pid(d, i)) {
2232                         /*
2233                          * Can grant only one writer
2234                          */
2235                         granted &= ~SMB2_LEASE_WRITE;
2236                 }
2237
2238                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2239                     !share_mode_stale_pid(d, i)) {
2240                         got_handle_lease = true;
2241                 }
2242
2243                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2244                     !share_mode_stale_pid(d, i)) {
2245                         got_oplock = true;
2246                 }
2247         }
2248
2249         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2250                 bool allow_level2 =
2251                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2252                         lp_level2_oplocks(SNUM(fsp->conn));
2253
2254                 if (!allow_level2) {
2255                         granted = SMB2_LEASE_NONE;
2256                 }
2257         }
2258
2259         if (oplock_request == LEASE_OPLOCK) {
2260                 if (got_oplock) {
2261                         granted &= ~SMB2_LEASE_HANDLE;
2262                 }
2263
2264                 fsp->oplock_type = LEASE_OPLOCK;
2265
2266                 status = grant_fsp_lease(fsp, lck, lease, &lease_idx,
2267                                          granted);
2268                 if (!NT_STATUS_IS_OK(status)) {
2269                         return status;
2270
2271                 }
2272                 *lease = fsp->lease->lease;
2273                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2274         } else {
2275                 if (got_handle_lease) {
2276                         granted = SMB2_LEASE_NONE;
2277                 }
2278
2279                 switch (granted) {
2280                 case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2281                         fsp->oplock_type = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2282                         break;
2283                 case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2284                         fsp->oplock_type = EXCLUSIVE_OPLOCK;
2285                         break;
2286                 case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2287                 case SMB2_LEASE_READ:
2288                         fsp->oplock_type = LEVEL_II_OPLOCK;
2289                         break;
2290                 default:
2291                         fsp->oplock_type = NO_OPLOCK;
2292                         break;
2293                 }
2294
2295                 status = set_file_oplock(fsp);
2296                 if (!NT_STATUS_IS_OK(status)) {
2297                         /*
2298                          * Could not get the kernel oplock
2299                          */
2300                         fsp->oplock_type = NO_OPLOCK;
2301                 }
2302         }
2303
2304         ok = set_share_mode(lck, fsp, get_current_uid(fsp->conn),
2305                             req ? req->mid : 0,
2306                             fsp->oplock_type,
2307                             lease_idx);
2308         if (!ok) {
2309                 return NT_STATUS_NO_MEMORY;
2310         }
2311
2312         ok = update_num_read_oplocks(fsp, lck);
2313         if (!ok) {
2314                 del_share_mode(lck, fsp);
2315                 return NT_STATUS_INTERNAL_ERROR;
2316         }
2317
2318         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2319                   fsp->oplock_type, fsp_str_dbg(fsp)));
2320
2321         return NT_STATUS_OK;
2322 }
2323
2324 static bool request_timed_out(struct timeval request_time,
2325                               struct timeval timeout)
2326 {
2327         struct timeval now, end_time;
2328         GetTimeOfDay(&now);
2329         end_time = timeval_sum(&request_time, &timeout);
2330         return (timeval_compare(&end_time, &now) < 0);
2331 }
2332
2333 static struct deferred_open_record *deferred_open_record_create(
2334         bool delayed_for_oplocks,
2335         bool async_open,
2336         struct file_id id)
2337 {
2338         struct deferred_open_record *record = NULL;
2339
2340         record = talloc(NULL, struct deferred_open_record);
2341         if (record == NULL) {
2342                 return NULL;
2343         }
2344
2345         *record = (struct deferred_open_record) {
2346                 .delayed_for_oplocks = delayed_for_oplocks,
2347                 .async_open = async_open,
2348                 .id = id,
2349         };
2350
2351         return record;
2352 }
2353
2354 struct defer_open_state {
2355         struct smbXsrv_connection *xconn;
2356         uint64_t mid;
2357 };
2358
2359 static void defer_open_done(struct tevent_req *req);
2360
2361 /**
2362  * Defer an open and watch a locking.tdb record
2363  *
2364  * This defers an open that gets rescheduled once the locking.tdb record watch
2365  * is triggered by a change to the record.
2366  *
2367  * It is used to defer opens that triggered an oplock break and for the SMB1
2368  * sharing violation delay.
2369  **/
2370 static void defer_open(struct share_mode_lock *lck,
2371                        struct timeval request_time,
2372                        struct timeval timeout,
2373                        struct smb_request *req,
2374                        bool delayed_for_oplocks,
2375                        struct file_id id)
2376 {
2377         struct deferred_open_record *open_rec = NULL;
2378         struct timeval abs_timeout;
2379         struct defer_open_state *watch_state;
2380         struct tevent_req *watch_req;
2381         bool ok;
2382
2383         abs_timeout = timeval_sum(&request_time, &timeout);
2384
2385         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2386                   "delayed_for_oplocks [%s] file_id [%s]\n",
2387                   timeval_string(talloc_tos(), &request_time, false),
2388                   timeval_string(talloc_tos(), &abs_timeout, false),
2389                   req->mid,
2390                   delayed_for_oplocks ? "yes" : "no",
2391                   file_id_string_tos(&id));
2392
2393         open_rec = deferred_open_record_create(delayed_for_oplocks,
2394                                                false,
2395                                                id);
2396         if (open_rec == NULL) {
2397                 TALLOC_FREE(lck);
2398                 exit_server("talloc failed");
2399         }
2400
2401         watch_state = talloc(open_rec, struct defer_open_state);
2402         if (watch_state == NULL) {
2403                 exit_server("talloc failed");
2404         }
2405         watch_state->xconn = req->xconn;
2406         watch_state->mid = req->mid;
2407
2408         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2409
2410         watch_req = dbwrap_watched_watch_send(watch_state,
2411                                               req->sconn->ev_ctx,
2412                                               lck->data->record,
2413                                               (struct server_id){0});
2414         if (watch_req == NULL) {
2415                 exit_server("Could not watch share mode record");
2416         }
2417         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2418
2419         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2420         if (!ok) {
2421                 exit_server("tevent_req_set_endtime failed");
2422         }
2423
2424         ok = push_deferred_open_message_smb(req, request_time, timeout,
2425                                             open_rec->id, open_rec);
2426         if (!ok) {
2427                 TALLOC_FREE(lck);
2428                 exit_server("push_deferred_open_message_smb failed");
2429         }
2430 }
2431
2432 static void defer_open_done(struct tevent_req *req)
2433 {
2434         struct defer_open_state *state = tevent_req_callback_data(
2435                 req, struct defer_open_state);
2436         NTSTATUS status;
2437         bool ret;
2438
2439         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2440         TALLOC_FREE(req);
2441         if (!NT_STATUS_IS_OK(status)) {
2442                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2443                           nt_errstr(status)));
2444                 /*
2445                  * Even if it failed, retry anyway. TODO: We need a way to
2446                  * tell a re-scheduled open about that error.
2447                  */
2448         }
2449
2450         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2451
2452         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2453         SMB_ASSERT(ret);
2454         TALLOC_FREE(state);
2455 }
2456
2457 /**
2458  * Actually attempt the kernel oplock polling open.
2459  */
2460
2461 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2462                                       struct tevent_timer *te,
2463                                       struct timeval current_time,
2464                                       void *private_data)
2465 {
2466         bool ok;
2467         struct smb_request *req = (struct smb_request *)private_data;
2468
2469         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2470         if (!ok) {
2471                 exit_server("schedule_deferred_open_message_smb failed");
2472         }
2473         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2474 }
2475
2476 /**
2477  * Reschedule an open for 1 second from now, if not timed out.
2478  **/
2479 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2480                        struct smb_request *req,
2481                        struct file_id id)
2482 {
2483
2484         bool ok;
2485         struct deferred_open_record *open_rec = NULL;
2486         /* Maximum wait time. */
2487         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2488
2489         if (request_timed_out(request_time, timeout)) {
2490                 return;
2491         }
2492
2493         open_rec = deferred_open_record_create(false, false, id);
2494         if (open_rec == NULL) {
2495                 exit_server("talloc failed");
2496         }
2497
2498         ok = push_deferred_open_message_smb(req,
2499                                             request_time,
2500                                             timeout,
2501                                             id,
2502                                             open_rec);
2503         if (!ok) {
2504                 exit_server("push_deferred_open_message_smb failed");
2505         }
2506
2507         /*
2508          * As this timer event is owned by req, it will
2509          * disappear if req it talloc_freed.
2510          */
2511         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2512                                         req,
2513                                         timeval_current_ofs(1, 0),
2514                                         kernel_oplock_poll_open_timer,
2515                                         req);
2516         if (open_rec->te == NULL) {
2517                 exit_server("tevent_add_timer failed");
2518         }
2519
2520         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2521                   timeval_string(talloc_tos(), &request_time, false),
2522                   req->mid,
2523                   file_id_string_tos(&id));
2524 }
2525
2526 /****************************************************************************
2527  On overwrite open ensure that the attributes match.
2528 ****************************************************************************/
2529
2530 static bool open_match_attributes(connection_struct *conn,
2531                                   uint32_t old_dos_attr,
2532                                   uint32_t new_dos_attr,
2533                                   mode_t new_unx_mode,
2534                                   mode_t *returned_unx_mode)
2535 {
2536         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2537
2538         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2539         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2540
2541         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2542            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2543                 *returned_unx_mode = new_unx_mode;
2544         } else {
2545                 *returned_unx_mode = (mode_t)0;
2546         }
2547
2548         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2549                   "new_dos_attr = 0x%x "
2550                   "returned_unx_mode = 0%o\n",
2551                   (unsigned int)old_dos_attr,
2552                   (unsigned int)new_dos_attr,
2553                   (unsigned int)*returned_unx_mode ));
2554
2555         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2556         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2557                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2558                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2559                         return False;
2560                 }
2561         }
2562         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2563                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2564                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2565                         return False;
2566                 }
2567         }
2568         return True;
2569 }
2570
2571 /****************************************************************************
2572  Special FCB or DOS processing in the case of a sharing violation.
2573  Try and find a duplicated file handle.
2574 ****************************************************************************/
2575
2576 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2577                                 connection_struct *conn,
2578                                 files_struct *fsp_to_dup_into,
2579                                 const struct smb_filename *smb_fname,
2580                                 struct file_id id,
2581                                 uint16_t file_pid,
2582                                 uint64_t vuid,
2583                                 uint32_t access_mask,
2584                                 uint32_t share_access,
2585                                 uint32_t create_options)
2586 {
2587         files_struct *fsp;
2588
2589         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2590                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2591
2592         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2593             fsp = file_find_di_next(fsp)) {
2594
2595                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2596                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2597                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2598                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2599                           (unsigned int)fsp->file_pid,
2600                           (unsigned int)fsp->fh->private_options,
2601                           (unsigned int)fsp->access_mask ));
2602
2603                 if (fsp != fsp_to_dup_into &&
2604                     fsp->fh->fd != -1 &&
2605                     fsp->vuid == vuid &&
2606                     fsp->file_pid == file_pid &&
2607                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2608                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2609                     (fsp->access_mask & FILE_WRITE_DATA) &&
2610                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2611                     strequal(fsp->fsp_name->stream_name,
2612                              smb_fname->stream_name)) {
2613                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2614                         break;
2615                 }
2616         }
2617
2618         if (!fsp) {
2619                 return NT_STATUS_NOT_FOUND;
2620         }
2621
2622         /* quite an insane set of semantics ... */
2623         if (is_executable(smb_fname->base_name) &&
2624             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2625                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2626                 return NT_STATUS_INVALID_PARAMETER;
2627         }
2628
2629         /* We need to duplicate this fsp. */
2630         return dup_file_fsp(req, fsp, access_mask, share_access,
2631                             create_options, fsp_to_dup_into);
2632 }
2633
2634 static void schedule_defer_open(struct share_mode_lock *lck,
2635                                 struct file_id id,
2636                                 struct timeval request_time,
2637                                 struct smb_request *req)
2638 {
2639         /* This is a relative time, added to the absolute
2640            request_time value to get the absolute timeout time.
2641            Note that if this is the second or greater time we enter
2642            this codepath for this particular request mid then
2643            request_time is left as the absolute time of the *first*
2644            time this request mid was processed. This is what allows
2645            the request to eventually time out. */
2646
2647         struct timeval timeout;
2648
2649         /* Normally the smbd we asked should respond within
2650          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2651          * the client did, give twice the timeout as a safety
2652          * measure here in case the other smbd is stuck
2653          * somewhere else. */
2654
2655         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2656
2657         if (request_timed_out(request_time, timeout)) {
2658                 return;
2659         }
2660
2661         defer_open(lck, request_time, timeout, req, true, id);
2662 }
2663
2664 /****************************************************************************
2665  Reschedule an open call that went asynchronous.
2666 ****************************************************************************/
2667
2668 static void schedule_async_open_timer(struct tevent_context *ev,
2669                                       struct tevent_timer *te,
2670                                       struct timeval current_time,
2671                                       void *private_data)
2672 {
2673         exit_server("async open timeout");
2674 }
2675
2676 static void schedule_async_open(struct timeval request_time,
2677                                 struct smb_request *req)
2678 {
2679         struct deferred_open_record *open_rec = NULL;
2680         struct timeval timeout = timeval_set(20, 0);
2681         bool ok;
2682
2683         if (request_timed_out(request_time, timeout)) {
2684                 return;
2685         }
2686
2687         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2688         if (open_rec == NULL) {
2689                 exit_server("deferred_open_record_create failed");
2690         }
2691
2692         ok = push_deferred_open_message_smb(req, request_time, timeout,
2693                                             (struct file_id){0}, open_rec);
2694         if (!ok) {
2695                 exit_server("push_deferred_open_message_smb failed");
2696         }
2697
2698         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2699                                         req,
2700                                         timeval_current_ofs(20, 0),
2701                                         schedule_async_open_timer,
2702                                         open_rec);
2703         if (open_rec->te == NULL) {
2704                 exit_server("tevent_add_timer failed");
2705         }
2706 }
2707
2708 /****************************************************************************
2709  Work out what access_mask to use from what the client sent us.
2710 ****************************************************************************/
2711
2712 static NTSTATUS smbd_calculate_maximum_allowed_access(
2713         connection_struct *conn,
2714         const struct smb_filename *smb_fname,
2715         bool use_privs,
2716         uint32_t *p_access_mask)
2717 {
2718         struct security_descriptor *sd;
2719         uint32_t access_granted;
2720         NTSTATUS status;
2721
2722         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2723                 *p_access_mask |= FILE_GENERIC_ALL;
2724                 return NT_STATUS_OK;
2725         }
2726
2727         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2728                                     (SECINFO_OWNER |
2729                                      SECINFO_GROUP |
2730                                      SECINFO_DACL),
2731                                     talloc_tos(), &sd);
2732
2733         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2734                 /*
2735                  * File did not exist
2736                  */
2737                 *p_access_mask = FILE_GENERIC_ALL;
2738                 return NT_STATUS_OK;
2739         }
2740         if (!NT_STATUS_IS_OK(status)) {
2741                 DEBUG(10,("Could not get acl on file %s: %s\n",
2742                           smb_fname_str_dbg(smb_fname),
2743                           nt_errstr(status)));
2744                 return NT_STATUS_ACCESS_DENIED;
2745         }
2746
2747         /*
2748          * If we can access the path to this file, by
2749          * default we have FILE_READ_ATTRIBUTES from the
2750          * containing directory. See the section:
2751          * "Algorithm to Check Access to an Existing File"
2752          * in MS-FSA.pdf.
2753          *
2754          * se_file_access_check()
2755          * also takes care of owner WRITE_DAC and READ_CONTROL.
2756          */
2757         status = se_file_access_check(sd,
2758                                  get_current_nttok(conn),
2759                                  use_privs,
2760                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2761                                  &access_granted);
2762
2763         TALLOC_FREE(sd);
2764
2765         if (!NT_STATUS_IS_OK(status)) {
2766                 DEBUG(10, ("Access denied on file %s: "
2767                            "when calculating maximum access\n",
2768                            smb_fname_str_dbg(smb_fname)));
2769                 return NT_STATUS_ACCESS_DENIED;
2770         }
2771         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2772
2773         if (!(access_granted & DELETE_ACCESS)) {
2774                 if (can_delete_file_in_directory(conn, smb_fname)) {
2775                         *p_access_mask |= DELETE_ACCESS;
2776                 }
2777         }
2778
2779         return NT_STATUS_OK;
2780 }
2781
2782 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2783                                     const struct smb_filename *smb_fname,
2784                                     bool use_privs,
2785                                     uint32_t access_mask,
2786                                     uint32_t *access_mask_out)
2787 {
2788         NTSTATUS status;
2789         uint32_t orig_access_mask = access_mask;
2790         uint32_t rejected_share_access;
2791
2792         if (access_mask & SEC_MASK_INVALID) {
2793                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2794                           access_mask);
2795                 return NT_STATUS_ACCESS_DENIED;
2796         }
2797
2798         /*
2799          * Convert GENERIC bits to specific bits.
2800          */
2801
2802         se_map_generic(&access_mask, &file_generic_mapping);
2803
2804         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2805         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2806
2807                 status = smbd_calculate_maximum_allowed_access(
2808                         conn, smb_fname, use_privs, &access_mask);
2809
2810                 if (!NT_STATUS_IS_OK(status)) {
2811                         return status;
2812                 }
2813
2814                 access_mask &= conn->share_access;
2815         }
2816
2817         rejected_share_access = access_mask & ~(conn->share_access);
2818
2819         if (rejected_share_access) {
2820                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2821                         "file %s: rejected by share access mask[0x%08X] "
2822                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2823                         smb_fname_str_dbg(smb_fname),
2824                         conn->share_access,
2825                         orig_access_mask, access_mask,
2826                         rejected_share_access));
2827                 return NT_STATUS_ACCESS_DENIED;
2828         }
2829
2830         *access_mask_out = access_mask;
2831         return NT_STATUS_OK;
2832 }
2833
2834 /****************************************************************************
2835  Remove the deferred open entry under lock.
2836 ****************************************************************************/
2837
2838 /****************************************************************************
2839  Return true if this is a state pointer to an asynchronous create.
2840 ****************************************************************************/
2841
2842 bool is_deferred_open_async(const struct deferred_open_record *rec)
2843 {
2844         return rec->async_open;
2845 }
2846
2847 static bool clear_ads(uint32_t create_disposition)
2848 {
2849         bool ret = false;
2850
2851         switch (create_disposition) {
2852         case FILE_SUPERSEDE:
2853         case FILE_OVERWRITE_IF:
2854         case FILE_OVERWRITE:
2855                 ret = true;
2856                 break;
2857         default:
2858                 break;
2859         }
2860         return ret;
2861 }
2862
2863 static int disposition_to_open_flags(uint32_t create_disposition)
2864 {
2865         int ret = 0;
2866
2867         /*
2868          * Currently we're using FILE_SUPERSEDE as the same as
2869          * FILE_OVERWRITE_IF but they really are
2870          * different. FILE_SUPERSEDE deletes an existing file
2871          * (requiring delete access) then recreates it.
2872          */
2873
2874         switch (create_disposition) {
2875         case FILE_SUPERSEDE:
2876         case FILE_OVERWRITE_IF:
2877                 /*
2878                  * If file exists replace/overwrite. If file doesn't
2879                  * exist create.
2880                  */
2881                 ret = O_CREAT|O_TRUNC;
2882                 break;
2883
2884         case FILE_OPEN:
2885                 /*
2886                  * If file exists open. If file doesn't exist error.
2887                  */
2888                 ret = 0;
2889                 break;
2890
2891         case FILE_OVERWRITE:
2892                 /*
2893                  * If file exists overwrite. If file doesn't exist
2894                  * error.
2895                  */
2896                 ret = O_TRUNC;
2897                 break;
2898
2899         case FILE_CREATE:
2900                 /*
2901                  * If file exists error. If file doesn't exist create.
2902                  */
2903                 ret = O_CREAT|O_EXCL;
2904                 break;
2905
2906         case FILE_OPEN_IF:
2907                 /*
2908                  * If file exists open. If file doesn't exist create.
2909                  */
2910                 ret = O_CREAT;
2911                 break;
2912         }
2913         return ret;
2914 }
2915
2916 static int calculate_open_access_flags(uint32_t access_mask,
2917                                        uint32_t private_flags)
2918 {
2919         bool need_write, need_read;
2920
2921         /*
2922          * Note that we ignore the append flag as append does not
2923          * mean the same thing under DOS and Unix.
2924          */
2925
2926         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2927         if (!need_write) {
2928                 return O_RDONLY;
2929         }
2930
2931         /* DENY_DOS opens are always underlying read-write on the
2932            file handle, no matter what the requested access mask
2933            says. */
2934
2935         need_read =
2936                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2937                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2938                                 FILE_READ_EA|FILE_EXECUTE));
2939
2940         if (!need_read) {
2941                 return O_WRONLY;
2942         }
2943         return O_RDWR;
2944 }
2945
2946 /****************************************************************************
2947  Open a file with a share mode. Passed in an already created files_struct *.
2948 ****************************************************************************/
2949
2950 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2951                             struct smb_request *req,
2952                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
2953                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
2954                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
2955                             uint32_t create_options,    /* options such as delete on close. */
2956                             uint32_t new_dos_attributes,        /* attributes used for new file. */
2957                             int oplock_request,         /* internal Samba oplock codes. */
2958                             struct smb2_lease *lease,
2959                                                         /* Information (FILE_EXISTS etc.) */
2960                             uint32_t private_flags,     /* Samba specific flags. */
2961                             int *pinfo,
2962                             files_struct *fsp)
2963 {
2964         struct smb_filename *smb_fname = fsp->fsp_name;
2965         int flags=0;
2966         int flags2=0;
2967         bool file_existed = VALID_STAT(smb_fname->st);
2968         bool def_acl = False;
2969         bool posix_open = False;
2970         bool new_file_created = False;
2971         bool first_open_attempt = true;
2972         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
2973         mode_t new_unx_mode = (mode_t)0;
2974         mode_t unx_mode = (mode_t)0;
2975         int info;
2976         uint32_t existing_dos_attributes = 0;
2977         struct timeval request_time = timeval_zero();
2978         struct share_mode_lock *lck = NULL;
2979         uint32_t open_access_mask = access_mask;
2980         NTSTATUS status;
2981         char *parent_dir;
2982         SMB_STRUCT_STAT saved_stat = smb_fname->st;
2983         struct timespec old_write_time;
2984         struct file_id id;
2985
2986         if (conn->printer) {
2987                 /*
2988                  * Printers are handled completely differently.
2989                  * Most of the passed parameters are ignored.
2990                  */
2991
2992                 if (pinfo) {
2993                         *pinfo = FILE_WAS_CREATED;
2994                 }
2995
2996                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
2997                            smb_fname_str_dbg(smb_fname)));
2998
2999                 if (!req) {
3000                         DEBUG(0,("open_file_ntcreate: printer open without "
3001                                 "an SMB request!\n"));
3002                         return NT_STATUS_INTERNAL_ERROR;
3003                 }
3004
3005                 return print_spool_open(fsp, smb_fname->base_name,
3006                                         req->vuid);
3007         }
3008
3009         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3010                             NULL)) {
3011                 return NT_STATUS_NO_MEMORY;
3012         }
3013
3014         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3015                 posix_open = True;
3016                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3017                 new_dos_attributes = 0;
3018         } else {
3019                 /* Windows allows a new file to be created and
3020                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3021                    sent by the client. Do the same. */
3022
3023                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3024
3025                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3026                  * created new. */
3027                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3028                                      smb_fname, parent_dir);
3029         }
3030
3031         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3032                    "access_mask=0x%x share_access=0x%x "
3033                    "create_disposition = 0x%x create_options=0x%x "
3034                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3035                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3036                    access_mask, share_access, create_disposition,
3037                    create_options, (unsigned int)unx_mode, oplock_request,
3038                    (unsigned int)private_flags));
3039
3040         if (req == NULL) {
3041                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3042                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3043         } else {
3044                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3045                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3046         }
3047
3048         /*
3049          * Only non-internal opens can be deferred at all
3050          */
3051
3052         if (req) {
3053                 struct deferred_open_record *open_rec;
3054                 if (get_deferred_open_message_state(req,
3055                                 &request_time,
3056                                 &open_rec)) {
3057                         /* Remember the absolute time of the original
3058                            request with this mid. We'll use it later to
3059                            see if this has timed out. */
3060
3061                         /* If it was an async create retry, the file
3062                            didn't exist. */
3063
3064                         if (is_deferred_open_async(open_rec)) {
3065                                 SET_STAT_INVALID(smb_fname->st);
3066                                 file_existed = false;
3067                         }
3068
3069                         /* Ensure we don't reprocess this message. */
3070                         remove_deferred_open_message_smb(req->xconn, req->mid);
3071
3072                         first_open_attempt = false;
3073                 }
3074         }
3075
3076         if (!posix_open) {
3077                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3078                 if (file_existed) {
3079                         /*
3080                          * Only use strored DOS attributes for checks
3081                          * against requested attributes (below via
3082                          * open_match_attributes()), cf bug #11992
3083                          * for details. -slow
3084                          */
3085                         uint32_t attr = 0;
3086
3087                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3088                         if (NT_STATUS_IS_OK(status)) {
3089                                 existing_dos_attributes = attr;
3090                         }
3091                 }
3092         }
3093
3094         /* ignore any oplock requests if oplocks are disabled */
3095         if (!lp_oplocks(SNUM(conn)) ||
3096             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3097                 /* Mask off everything except the private Samba bits. */
3098                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3099         }
3100
3101         /* this is for OS/2 long file names - say we don't support them */
3102         if (req != NULL && !req->posix_pathnames &&
3103                         strstr(smb_fname->base_name,".+,;=[].")) {
3104                 /* OS/2 Workplace shell fix may be main code stream in a later
3105                  * release. */
3106                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3107                          "supported.\n"));
3108                 if (use_nt_status()) {
3109                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3110                 }
3111                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3112         }
3113
3114         switch( create_disposition ) {
3115                 case FILE_OPEN:
3116                         /* If file exists open. If file doesn't exist error. */
3117                         if (!file_existed) {
3118                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
3119                                          "requested for file %s and file "
3120                                          "doesn't exist.\n",
3121                                          smb_fname_str_dbg(smb_fname)));
3122                                 errno = ENOENT;
3123                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3124                         }
3125                         break;
3126
3127                 case FILE_OVERWRITE:
3128                         /* If file exists overwrite. If file doesn't exist
3129                          * error. */
3130                         if (!file_existed) {
3131                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3132                                          "requested for file %s and file "
3133                                          "doesn't exist.\n",
3134                                          smb_fname_str_dbg(smb_fname) ));
3135                                 errno = ENOENT;
3136                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3137                         }
3138                         break;
3139
3140                 case FILE_CREATE:
3141                         /* If file exists error. If file doesn't exist
3142                          * create. */
3143                         if (file_existed) {
3144                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3145                                          "requested for file %s and file "
3146                                          "already exists.\n",
3147                                          smb_fname_str_dbg(smb_fname)));
3148                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3149                                         errno = EISDIR;
3150                                 } else {
3151                                         errno = EEXIST;
3152                                 }
3153                                 return map_nt_error_from_unix(errno);
3154                         }
3155                         break;
3156
3157                 case FILE_SUPERSEDE:
3158                 case FILE_OVERWRITE_IF:
3159                 case FILE_OPEN_IF:
3160                         break;
3161                 default:
3162                         return NT_STATUS_INVALID_PARAMETER;
3163         }
3164
3165         flags2 = disposition_to_open_flags(create_disposition);
3166
3167         /* We only care about matching attributes on file exists and
3168          * overwrite. */
3169
3170         if (!posix_open && file_existed &&
3171             ((create_disposition == FILE_OVERWRITE) ||
3172              (create_disposition == FILE_OVERWRITE_IF))) {
3173                 if (!open_match_attributes(conn, existing_dos_attributes,
3174                                            new_dos_attributes,
3175                                            unx_mode, &new_unx_mode)) {
3176                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3177                                  "for file %s (%x %x) (0%o, 0%o)\n",
3178                                  smb_fname_str_dbg(smb_fname),
3179                                  existing_dos_attributes,
3180                                  new_dos_attributes,
3181                                  (unsigned int)smb_fname->st.st_ex_mode,
3182                                  (unsigned int)unx_mode ));
3183                         errno = EACCES;
3184                         return NT_STATUS_ACCESS_DENIED;
3185                 }
3186         }
3187
3188         status = smbd_calculate_access_mask(conn, smb_fname,
3189                                         false,
3190                                         access_mask,
3191                                         &access_mask);
3192         if (!NT_STATUS_IS_OK(status)) {
3193                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3194                         "on file %s returned %s\n",
3195                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3196                 return status;
3197         }
3198
3199         open_access_mask = access_mask;
3200
3201         if (flags2 & O_TRUNC) {
3202                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3203         }
3204
3205         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3206                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3207                     access_mask));
3208
3209         /*
3210          * Note that we ignore the append flag as append does not
3211          * mean the same thing under DOS and Unix.
3212          */
3213
3214         flags = calculate_open_access_flags(access_mask, private_flags);
3215
3216         /*
3217          * Currently we only look at FILE_WRITE_THROUGH for create options.
3218          */
3219
3220 #if defined(O_SYNC)
3221         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3222                 flags2 |= O_SYNC;
3223         }
3224 #endif /* O_SYNC */
3225
3226         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3227                 flags2 |= O_APPEND;
3228         }
3229
3230         if (!posix_open && !CAN_WRITE(conn)) {
3231                 /*
3232                  * We should really return a permission denied error if either
3233                  * O_CREAT or O_TRUNC are set, but for compatibility with
3234                  * older versions of Samba we just AND them out.
3235                  */
3236                 flags2 &= ~(O_CREAT|O_TRUNC);
3237         }
3238
3239         if (lp_kernel_oplocks(SNUM(conn))) {
3240                 /*
3241                  * With kernel oplocks the open breaking an oplock
3242                  * blocks until the oplock holder has given up the
3243                  * oplock or closed the file. We prevent this by always
3244                  * trying to open the file with O_NONBLOCK (see "man
3245                  * fcntl" on Linux).
3246                  *
3247                  * If a process that doesn't use the smbd open files
3248                  * database or communication methods holds a kernel
3249                  * oplock we must periodically poll for available open
3250                  * using O_NONBLOCK.
3251                  */
3252                 flags2 |= O_NONBLOCK;
3253         }
3254
3255         /*
3256          * Ensure we can't write on a read-only share or file.
3257          */
3258
3259         if (flags != O_RDONLY && file_existed &&
3260             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3261                 DEBUG(5,("open_file_ntcreate: write access requested for "
3262                          "file %s on read only %s\n",
3263                          smb_fname_str_dbg(smb_fname),
3264                          !CAN_WRITE(conn) ? "share" : "file" ));
3265                 errno = EACCES;
3266                 return NT_STATUS_ACCESS_DENIED;
3267         }
3268
3269         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3270         fsp->share_access = share_access;
3271         fsp->fh->private_options = private_flags;
3272         fsp->access_mask = open_access_mask; /* We change this to the
3273                                               * requested access_mask after
3274                                               * the open is done. */
3275         if (posix_open) {
3276                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3277         }
3278
3279         if (timeval_is_zero(&request_time)) {
3280                 request_time = fsp->open_time;
3281         }
3282
3283         /*
3284          * Ensure we pay attention to default ACLs on directories if required.
3285          */
3286
3287         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3288             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3289                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3290         }
3291
3292         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3293                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3294                  (unsigned int)flags, (unsigned int)flags2,
3295                  (unsigned int)unx_mode, (unsigned int)access_mask,
3296                  (unsigned int)open_access_mask));
3297
3298         fsp_open = open_file(fsp, conn, req, parent_dir,
3299                              flags|flags2, unx_mode, access_mask,
3300                              open_access_mask, &new_file_created);
3301
3302         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3303                 bool delay;
3304
3305                 /*
3306                  * This handles the kernel oplock case:
3307                  *
3308                  * the file has an active kernel oplock and the open() returned
3309                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3310                  *
3311                  * "Samba locking.tdb oplocks" are handled below after acquiring
3312                  * the sharemode lock with get_share_mode_lock().
3313                  */
3314                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3315                         DEBUG(10, ("FIFO busy\n"));
3316                         return NT_STATUS_NETWORK_BUSY;
3317                 }
3318                 if (req == NULL) {
3319                         DEBUG(10, ("Internal open busy\n"));
3320                         return NT_STATUS_NETWORK_BUSY;
3321                 }
3322
3323                 /*
3324                  * From here on we assume this is an oplock break triggered
3325                  */
3326
3327                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3328                 if (lck == NULL) {
3329                         /*
3330                          * No oplock from Samba around. Set up a poll every 1
3331                          * second to retry a non-blocking open until the time
3332                          * expires.
3333                          */
3334                         setup_kernel_oplock_poll_open(request_time,
3335                                                 req,
3336                                                 fsp->file_id);
3337                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3338                                 "Retrying with poll\n");
3339                         return NT_STATUS_SHARING_VIOLATION;
3340                 }
3341
3342                 if (!validate_oplock_types(lck)) {
3343                         smb_panic("validate_oplock_types failed");
3344                 }
3345
3346                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3347                                          create_disposition,
3348                                          first_open_attempt);
3349                 if (delay) {
3350                         schedule_defer_open(lck, fsp->file_id, request_time,
3351                                             req);
3352                         TALLOC_FREE(lck);
3353                         DEBUG(10, ("Sent oplock break request to kernel "
3354                                    "oplock holder\n"));
3355                         return NT_STATUS_SHARING_VIOLATION;
3356                 }
3357
3358                 /*
3359                  * No oplock from Samba around. Set up a poll every 1
3360                  * second to retry a non-blocking open until the time
3361                  * expires.
3362                  */
3363                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3364
3365                 TALLOC_FREE(lck);
3366                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3367                         "Retrying with poll\n");
3368                 return NT_STATUS_SHARING_VIOLATION;
3369         }
3370
3371         if (!NT_STATUS_IS_OK(fsp_open)) {
3372                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3373                         schedule_async_open(request_time, req);
3374                 }
3375                 return fsp_open;
3376         }
3377
3378         if (new_file_created) {
3379                 /*
3380                  * As we atomically create using O_CREAT|O_EXCL,
3381                  * then if new_file_created is true, then
3382                  * file_existed *MUST* have been false (even
3383                  * if the file was previously detected as being
3384                  * there).
3385                  */
3386                 file_existed = false;
3387         }
3388
3389         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3390                 /*
3391                  * The file did exist, but some other (local or NFS)
3392                  * process either renamed/unlinked and re-created the
3393                  * file with different dev/ino after we walked the path,
3394                  * but before we did the open. We could retry the
3395                  * open but it's a rare enough case it's easier to
3396                  * just fail the open to prevent creating any problems
3397                  * in the open file db having the wrong dev/ino key.
3398                  */
3399                 fd_close(fsp);
3400                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
3401                         "Old (dev=0x%llu, ino =0x%llu). "
3402                         "New (dev=0x%llu, ino=0x%llu). Failing open "
3403                         " with NT_STATUS_ACCESS_DENIED.\n",
3404                          smb_fname_str_dbg(smb_fname),
3405                          (unsigned long long)saved_stat.st_ex_dev,
3406                          (unsigned long long)saved_stat.st_ex_ino,
3407                          (unsigned long long)smb_fname->st.st_ex_dev,
3408                          (unsigned long long)smb_fname->st.st_ex_ino));
3409                 return NT_STATUS_ACCESS_DENIED;
3410         }
3411
3412         old_write_time = smb_fname->st.st_ex_mtime;
3413
3414         /*
3415          * Deal with the race condition where two smbd's detect the
3416          * file doesn't exist and do the create at the same time. One
3417          * of them will win and set a share mode, the other (ie. this
3418          * one) should check if the requested share mode for this
3419          * create is allowed.
3420          */
3421
3422         /*
3423          * Now the file exists and fsp is successfully opened,
3424          * fsp->dev and fsp->inode are valid and should replace the
3425          * dev=0,inode=0 from a non existent file. Spotted by
3426          * Nadav Danieli <nadavd@exanet.com>. JRA.
3427          */
3428
3429         id = fsp->file_id;
3430
3431         lck = get_share_mode_lock(talloc_tos(), id,
3432                                   conn->connectpath,
3433                                   smb_fname, &old_write_time);
3434
3435         if (lck == NULL) {
3436                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3437                           "mode lock for %s\n",
3438                           smb_fname_str_dbg(smb_fname)));
3439                 fd_close(fsp);
3440                 return NT_STATUS_SHARING_VIOLATION;
3441         }
3442
3443         /* Get the types we need to examine. */
3444         if (!validate_oplock_types(lck)) {
3445                 smb_panic("validate_oplock_types failed");
3446         }
3447
3448         if (has_delete_on_close(lck, fsp->name_hash)) {
3449                 TALLOC_FREE(lck);
3450                 fd_close(fsp);
3451                 return NT_STATUS_DELETE_PENDING;
3452         }
3453
3454         status = open_mode_check(conn, lck,
3455                                  access_mask, share_access);
3456
3457         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3458             (lck->data->num_share_modes > 0)) {
3459                 /*
3460                  * This comes from ancient times out of open_mode_check. I
3461                  * have no clue whether this is still necessary. I can't think
3462                  * of a case where this would actually matter further down in
3463                  * this function. I leave it here for further investigation
3464                  * :-)
3465                  */
3466                 file_existed = true;
3467         }
3468
3469         if (req != NULL) {
3470                 /*
3471                  * Handle oplocks, deferring the request if delay_for_oplock()
3472                  * triggered a break message and we have to wait for the break
3473                  * response.
3474                  */
3475                 bool delay;
3476                 bool sharing_violation = NT_STATUS_EQUAL(
3477                         status, NT_STATUS_SHARING_VIOLATION);
3478
3479                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3480                                          sharing_violation,
3481                                          create_disposition,
3482                                          first_open_attempt);
3483                 if (delay) {
3484                         schedule_defer_open(lck, fsp->file_id,
3485                                             request_time, req);
3486                         TALLOC_FREE(lck);
3487                         fd_close(fsp);
3488                         return NT_STATUS_SHARING_VIOLATION;
3489                 }
3490         }
3491
3492         if (!NT_STATUS_IS_OK(status)) {
3493                 uint32_t can_access_mask;
3494                 bool can_access = True;
3495
3496                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3497
3498                 /* Check if this can be done with the deny_dos and fcb
3499                  * calls. */
3500                 if (private_flags &
3501                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3502                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3503                         if (req == NULL) {
3504                                 DEBUG(0, ("DOS open without an SMB "
3505                                           "request!\n"));
3506                                 TALLOC_FREE(lck);
3507                                 fd_close(fsp);
3508                                 return NT_STATUS_INTERNAL_ERROR;
3509                         }
3510
3511                         /* Use the client requested access mask here,
3512                          * not the one we open with. */
3513                         status = fcb_or_dos_open(req,
3514                                                  conn,
3515                                                  fsp,
3516                                                  smb_fname,
3517                                                  id,
3518                                                  req->smbpid,
3519                                                  req->vuid,
3520                                                  access_mask,
3521                                                  share_access,
3522                                                  create_options);
3523
3524                         if (NT_STATUS_IS_OK(status)) {
3525                                 TALLOC_FREE(lck);
3526                                 if (pinfo) {
3527                                         *pinfo = FILE_WAS_OPENED;
3528                                 }
3529                                 return NT_STATUS_OK;
3530                         }
3531                 }
3532
3533                 /*
3534                  * This next line is a subtlety we need for
3535                  * MS-Access. If a file open will fail due to share
3536                  * permissions and also for security (access) reasons,
3537                  * we need to return the access failed error, not the
3538                  * share error. We can't open the file due to kernel
3539                  * oplock deadlock (it's possible we failed above on
3540                  * the open_mode_check()) so use a userspace check.
3541                  */
3542
3543                 if (flags & O_RDWR) {
3544                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3545                 } else if (flags & O_WRONLY) {
3546                         can_access_mask = FILE_WRITE_DATA;
3547                 } else {
3548                         can_access_mask = FILE_READ_DATA;
3549                 }
3550
3551                 if (((can_access_mask & FILE_WRITE_DATA) &&
3552                      !CAN_WRITE(conn)) ||
3553                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3554                                                               smb_fname,
3555                                                               false,
3556                                                               can_access_mask))) {
3557                         can_access = False;
3558                 }
3559
3560                 /*
3561                  * If we're returning a share violation, ensure we
3562                  * cope with the braindead 1 second delay (SMB1 only).
3563                  */
3564
3565                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3566                     !conn->sconn->using_smb2 &&
3567                     lp_defer_sharing_violations()) {
3568                         struct timeval timeout;
3569                         int timeout_usecs;
3570
3571                         /* this is a hack to speed up torture tests
3572                            in 'make test' */
3573                         timeout_usecs = lp_parm_int(SNUM(conn),
3574                                                     "smbd","sharedelay",
3575                                                     SHARING_VIOLATION_USEC_WAIT);
3576
3577                         /* This is a relative time, added to the absolute
3578                            request_time value to get the absolute timeout time.
3579                            Note that if this is the second or greater time we enter
3580                            this codepath for this particular request mid then
3581                            request_time is left as the absolute time of the *first*
3582                            time this request mid was processed. This is what allows
3583                            the request to eventually time out. */
3584
3585                         timeout = timeval_set(0, timeout_usecs);
3586
3587                         if (!request_timed_out(request_time, timeout)) {
3588                                 defer_open(lck, request_time, timeout, req,
3589                                            false, id);
3590                         }
3591                 }
3592
3593                 TALLOC_FREE(lck);
3594                 fd_close(fsp);
3595                 if (can_access) {
3596                         /*
3597                          * We have detected a sharing violation here
3598                          * so return the correct error code
3599                          */
3600                         status = NT_STATUS_SHARING_VIOLATION;
3601                 } else {
3602                         status = NT_STATUS_ACCESS_DENIED;
3603                 }
3604                 return status;
3605         }
3606
3607         /* Should we atomically (to the client at least) truncate ? */
3608         if ((!new_file_created) &&
3609             (flags2 & O_TRUNC) &&
3610             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3611                 int ret;
3612
3613                 ret = vfs_set_filelen(fsp, 0);
3614                 if (ret != 0) {
3615                         status = map_nt_error_from_unix(errno);
3616                         TALLOC_FREE(lck);
3617                         fd_close(fsp);
3618                         return status;
3619                 }
3620         }
3621
3622         /*
3623          * We have the share entry *locked*.....
3624          */
3625
3626         /* Delete streams if create_disposition requires it */
3627         if (!new_file_created && clear_ads(create_disposition) &&
3628             !is_ntfs_stream_smb_fname(smb_fname)) {
3629                 status = delete_all_streams(conn, smb_fname);
3630                 if (!NT_STATUS_IS_OK(status)) {
3631                         TALLOC_FREE(lck);
3632                         fd_close(fsp);
3633                         return status;
3634                 }
3635         }
3636
3637         /* note that we ignore failure for the following. It is
3638            basically a hack for NFS, and NFS will never set one of
3639            these only read them. Nobody but Samba can ever set a deny
3640            mode and we have already checked our more authoritative
3641            locking database for permission to set this deny mode. If
3642            the kernel refuses the operations then the kernel is wrong.
3643            note that GPFS supports it as well - jmcd */
3644
3645         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3646                 int ret_flock;
3647                 /*
3648                  * Beware: streams implementing VFS modules may
3649                  * implement streams in a way that fsp will have the
3650                  * basefile open in the fsp fd, so lacking a distinct
3651                  * fd for the stream kernel_flock will apply on the
3652                  * basefile which is wrong. The actual check is
3653                  * deffered to the VFS module implementing the
3654                  * kernel_flock call.
3655                  */
3656                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3657                 if(ret_flock == -1 ){
3658
3659                         TALLOC_FREE(lck);
3660                         fd_close(fsp);
3661
3662                         return NT_STATUS_SHARING_VIOLATION;
3663                 }
3664
3665                 fsp->kernel_share_modes_taken = true;
3666         }
3667
3668         /*
3669          * At this point onwards, we can guarantee that the share entry
3670          * is locked, whether we created the file or not, and that the
3671          * deny mode is compatible with all current opens.
3672          */
3673
3674         /*
3675          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3676          * but we don't have to store this - just ignore it on access check.
3677          */
3678         if (conn->sconn->using_smb2) {
3679                 /*
3680                  * SMB2 doesn't return it (according to Microsoft tests).
3681                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3682                  * File created with access = 0x7 (Read, Write, Delete)
3683                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3684                  */
3685                 fsp->access_mask = access_mask;
3686         } else {
3687                 /* But SMB1 does. */
3688                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3689         }
3690
3691         if (file_existed) {
3692                 /*
3693                  * stat opens on existing files don't get oplocks.
3694                  * They can get leases.
3695                  *
3696                  * Note that we check for stat open on the *open_access_mask*,
3697                  * i.e. the access mask we actually used to do the open,
3698                  * not the one the client asked for (which is in
3699                  * fsp->access_mask). This is due to the fact that
3700                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3701                  * which adds FILE_WRITE_DATA to open_access_mask.
3702                  */
3703                 if (is_stat_open(open_access_mask) && lease == NULL) {
3704                         oplock_request = NO_OPLOCK;
3705                 }
3706         }
3707
3708         if (new_file_created) {
3709                 info = FILE_WAS_CREATED;
3710         } else {
3711                 if (flags2 & O_TRUNC) {
3712                         info = FILE_WAS_OVERWRITTEN;
3713                 } else {
3714                         info = FILE_WAS_OPENED;
3715                 }
3716         }
3717
3718         if (pinfo) {
3719                 *pinfo = info;
3720         }
3721
3722         /*
3723          * Setup the oplock info in both the shared memory and
3724          * file structs.
3725          */
3726         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3727         if (!NT_STATUS_IS_OK(status)) {
3728                 TALLOC_FREE(lck);
3729                 fd_close(fsp);
3730                 return status;
3731         }
3732
3733         /* Handle strange delete on close create semantics. */
3734         if (create_options & FILE_DELETE_ON_CLOSE) {
3735
3736                 status = can_set_delete_on_close(fsp, new_dos_attributes);
3737
3738                 if (!NT_STATUS_IS_OK(status)) {
3739                         /* Remember to delete the mode we just added. */
3740                         del_share_mode(lck, fsp);
3741                         TALLOC_FREE(lck);
3742                         fd_close(fsp);
3743                         return status;
3744                 }
3745                 /* Note that here we set the *inital* delete on close flag,
3746                    not the regular one. The magic gets handled in close. */
3747                 fsp->initial_delete_on_close = True;
3748         }
3749
3750         if (info != FILE_WAS_OPENED) {
3751                 /* Overwritten files should be initially set as archive */
3752                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3753                     lp_store_dos_attributes(SNUM(conn))) {
3754                         if (!posix_open) {
3755                                 if (file_set_dosmode(conn, smb_fname,
3756                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3757                                             parent_dir, true) == 0) {
3758                                         unx_mode = smb_fname->st.st_ex_mode;
3759                                 }
3760                         }
3761                 }
3762         }
3763
3764         /* Determine sparse flag. */
3765         if (posix_open) {
3766                 /* POSIX opens are sparse by default. */
3767                 fsp->is_sparse = true;
3768         } else {
3769                 fsp->is_sparse = (file_existed &&
3770                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3771         }
3772
3773         /*
3774          * Take care of inherited ACLs on created files - if default ACL not
3775          * selected.
3776          */
3777
3778         if (!posix_open && new_file_created && !def_acl) {
3779                 if (unx_mode != smb_fname->st.st_ex_mode) {
3780                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3781                         if (ret == -1) {
3782                                 DBG_INFO("failed to reset "
3783                                   "attributes of file %s to 0%o\n",
3784                                   smb_fname_str_dbg(smb_fname),
3785                                   (unsigned int)unx_mode);
3786                         }
3787                 }
3788
3789         } else if (new_unx_mode) {
3790                 /*
3791                  * We only get here in the case of:
3792                  *
3793                  * a). Not a POSIX open.
3794                  * b). File already existed.
3795                  * c). File was overwritten.
3796                  * d). Requested DOS attributes didn't match
3797                  *     the DOS attributes on the existing file.
3798                  *
3799                  * In that case new_unx_mode has been set
3800                  * equal to the calculated mode (including
3801                  * possible inheritance of the mode from the
3802                  * containing directory).
3803                  *
3804                  * Note this mode was calculated with the
3805                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3806                  * so the mode change here is suitable for
3807                  * an overwritten file.
3808                  */
3809
3810                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3811                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3812                         if (ret == -1) {
3813                                 DBG_INFO("failed to reset "
3814                                   "attributes of file %s to 0%o\n",
3815                                   smb_fname_str_dbg(smb_fname),
3816                                   (unsigned int)new_unx_mode);
3817                         }
3818                 }
3819         }
3820
3821         {
3822                 /*
3823                  * Deal with other opens having a modified write time.
3824                  */
3825                 struct timespec write_time = get_share_mode_write_time(lck);
3826
3827                 if (!null_timespec(write_time)) {
3828                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3829                 }
3830         }
3831
3832         TALLOC_FREE(lck);
3833
3834         return NT_STATUS_OK;
3835 }
3836
3837 static NTSTATUS mkdir_internal(connection_struct *conn,
3838                                struct smb_filename *smb_dname,
3839                                uint32_t file_attributes)
3840 {
3841         mode_t mode;
3842         char *parent_dir = NULL;
3843         NTSTATUS status;
3844         bool posix_open = false;
3845         bool need_re_stat = false;
3846         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3847
3848         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3849                 DEBUG(5,("mkdir_internal: failing share access "
3850                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3851                 return NT_STATUS_ACCESS_DENIED;
3852         }
3853
3854         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3855                             NULL)) {
3856                 return NT_STATUS_NO_MEMORY;
3857         }
3858
3859         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3860                 posix_open = true;
3861                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3862         } else {
3863                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3864         }
3865
3866         status = check_parent_access(conn,
3867                                         smb_dname,
3868                                         access_mask);
3869         if(!NT_STATUS_IS_OK(status)) {
3870                 DEBUG(5,("mkdir_internal: check_parent_access "
3871                         "on directory %s for path %s returned %s\n",
3872                         parent_dir,
3873                         smb_dname->base_name,
3874                         nt_errstr(status) ));
3875                 return status;
3876         }
3877
3878         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3879                 return map_nt_error_from_unix(errno);
3880         }
3881
3882         /* Ensure we're checking for a symlink here.... */
3883         /* We don't want to get caught by a symlink racer. */
3884
3885         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3886                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3887                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3888                 return map_nt_error_from_unix(errno);
3889         }
3890
3891         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3892                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3893                           smb_fname_str_dbg(smb_dname)));
3894                 return NT_STATUS_NOT_A_DIRECTORY;
3895         }
3896
3897         if (lp_store_dos_attributes(SNUM(conn))) {
3898                 if (!posix_open) {
3899                         file_set_dosmode(conn, smb_dname,
3900                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3901                                          parent_dir, true);
3902                 }
3903         }
3904
3905         if (lp_inherit_permissions(SNUM(conn))) {
3906                 inherit_access_posix_acl(conn, parent_dir,
3907                                          smb_dname, mode);
3908                 need_re_stat = true;
3909         }
3910
3911         if (!posix_open) {
3912                 /*
3913                  * Check if high bits should have been set,
3914                  * then (if bits are missing): add them.
3915                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3916                  * dir.
3917                  */
3918                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3919                     (mode & ~smb_dname->st.st_ex_mode)) {
3920                         SMB_VFS_CHMOD(conn, smb_dname,
3921                                       (smb_dname->st.st_ex_mode |
3922                                           (mode & ~smb_dname->st.st_ex_mode)));
3923                         need_re_stat = true;
3924                 }
3925         }
3926
3927         /* Change the owner if required. */
3928         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
3929                 change_dir_owner_to_parent(conn, parent_dir,
3930                                            smb_dname,
3931                                            &smb_dname->st);
3932                 need_re_stat = true;
3933         }
3934
3935         if (need_re_stat) {
3936                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3937                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3938                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3939                         return map_nt_error_from_unix(errno);
3940                 }
3941         }
3942
3943         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
3944                      smb_dname->base_name);
3945
3946         return NT_STATUS_OK;
3947 }
3948
3949 /****************************************************************************
3950  Open a directory from an NT SMB call.
3951 ****************************************************************************/
3952
3953 static NTSTATUS open_directory(connection_struct *conn,
3954                                struct smb_request *req,
3955                                struct smb_filename *smb_dname,
3956                                uint32_t access_mask,
3957                                uint32_t share_access,
3958                                uint32_t create_disposition,
3959                                uint32_t create_options,
3960                                uint32_t file_attributes,
3961                                int *pinfo,
3962                                files_struct **result)
3963 {
3964         files_struct *fsp = NULL;
3965         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
3966         struct share_mode_lock *lck = NULL;
3967         NTSTATUS status;
3968         struct timespec mtimespec;
3969         int info = 0;
3970         bool ok;
3971
3972         if (is_ntfs_stream_smb_fname(smb_dname)) {
3973                 DEBUG(2, ("open_directory: %s is a stream name!\n",
3974                           smb_fname_str_dbg(smb_dname)));
3975                 return NT_STATUS_NOT_A_DIRECTORY;
3976         }
3977
3978         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
3979                 /* Ensure we have a directory attribute. */
3980                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
3981         }
3982
3983         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
3984                  "share_access = 0x%x create_options = 0x%x, "
3985                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
3986                  smb_fname_str_dbg(smb_dname),
3987                  (unsigned int)access_mask,
3988                  (unsigned int)share_access,
3989                  (unsigned int)create_options,
3990                  (unsigned int)create_disposition,
3991                  (unsigned int)file_attributes));
3992
3993         status = smbd_calculate_access_mask(conn, smb_dname, false,
3994                                             access_mask, &access_mask);
3995         if (!NT_STATUS_IS_OK(status)) {
3996                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
3997                         "on file %s returned %s\n",
3998                         smb_fname_str_dbg(smb_dname),
3999                         nt_errstr(status)));
4000                 return status;
4001         }
4002
4003         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4004                         !security_token_has_privilege(get_current_nttok(conn),
4005                                         SEC_PRIV_SECURITY)) {
4006                 DEBUG(10, ("open_directory: open on %s "
4007                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4008                         smb_fname_str_dbg(smb_dname)));
4009                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4010         }
4011
4012         switch( create_disposition ) {
4013                 case FILE_OPEN:
4014
4015                         if (!dir_existed) {
4016                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4017                         }
4018
4019                         info = FILE_WAS_OPENED;
4020                         break;
4021
4022                 case FILE_CREATE:
4023
4024                         /* If directory exists error. If directory doesn't
4025                          * exist create. */
4026
4027                         if (dir_existed) {
4028                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4029                                 DEBUG(2, ("open_directory: unable to create "
4030                                           "%s. Error was %s\n",
4031                                           smb_fname_str_dbg(smb_dname),
4032                                           nt_errstr(status)));
4033                                 return status;
4034                         }
4035
4036                         status = mkdir_internal(conn, smb_dname,
4037                                                 file_attributes);
4038
4039                         if (!NT_STATUS_IS_OK(status)) {
4040                                 DEBUG(2, ("open_directory: unable to create "
4041                                           "%s. Error was %s\n",
4042                                           smb_fname_str_dbg(smb_dname),
4043                                           nt_errstr(status)));
4044                                 return status;
4045                         }
4046
4047                         info = FILE_WAS_CREATED;
4048                         break;
4049
4050                 case FILE_OPEN_IF:
4051                         /*
4052                          * If directory exists open. If directory doesn't
4053                          * exist create.
4054                          */
4055
4056                         if (dir_existed) {
4057                                 status = NT_STATUS_OK;
4058                                 info = FILE_WAS_OPENED;
4059                         } else {
4060                                 status = mkdir_internal(conn, smb_dname,
4061                                                 file_attributes);
4062
4063                                 if (NT_STATUS_IS_OK(status)) {
4064                                         info = FILE_WAS_CREATED;
4065                                 } else {
4066                                         /* Cope with create race. */
4067                                         if (!NT_STATUS_EQUAL(status,
4068                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4069                                                 DEBUG(2, ("open_directory: unable to create "
4070                                                         "%s. Error was %s\n",
4071                                                         smb_fname_str_dbg(smb_dname),
4072                                                         nt_errstr(status)));
4073                                                 return status;
4074                                         }
4075
4076                                         /*
4077                                          * If mkdir_internal() returned
4078                                          * NT_STATUS_OBJECT_NAME_COLLISION
4079                                          * we still must lstat the path.
4080                                          */
4081
4082                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4083                                                         == -1) {
4084                                                 DEBUG(2, ("Could not stat "
4085                                                         "directory '%s' just "
4086                                                         "opened: %s\n",
4087                                                         smb_fname_str_dbg(
4088                                                                 smb_dname),
4089                                                         strerror(errno)));
4090                                                 return map_nt_error_from_unix(
4091                                                                 errno);
4092                                         }
4093
4094                                         info = FILE_WAS_OPENED;
4095                                 }
4096                         }
4097
4098                         break;
4099
4100                 case FILE_SUPERSEDE:
4101                 case FILE_OVERWRITE:
4102                 case FILE_OVERWRITE_IF:
4103                 default:
4104                         DEBUG(5,("open_directory: invalid create_disposition "
4105                                  "0x%x for directory %s\n",
4106                                  (unsigned int)create_disposition,
4107                                  smb_fname_str_dbg(smb_dname)));
4108                         return NT_STATUS_INVALID_PARAMETER;
4109         }
4110
4111         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4112                 DEBUG(5,("open_directory: %s is not a directory !\n",
4113                          smb_fname_str_dbg(smb_dname)));
4114                 return NT_STATUS_NOT_A_DIRECTORY;
4115         }
4116
4117         if (info == FILE_WAS_OPENED) {
4118                 status = smbd_check_access_rights(conn,
4119                                                 smb_dname,
4120                                                 false,
4121                                                 access_mask);
4122                 if (!NT_STATUS_IS_OK(status)) {
4123                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4124                                 "file %s failed with %s\n",
4125                                 smb_fname_str_dbg(smb_dname),
4126                                 nt_errstr(status)));
4127                         return status;
4128                 }
4129         }
4130
4131         status = file_new(req, conn, &fsp);
4132         if(!NT_STATUS_IS_OK(status)) {
4133                 return status;
4134         }
4135
4136         /*
4137          * Setup the files_struct for it.
4138          */
4139
4140         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4141         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4142         fsp->file_pid = req ? req->smbpid : 0;
4143         fsp->can_lock = False;
4144         fsp->can_read = False;
4145         fsp->can_write = False;
4146
4147         fsp->share_access = share_access;
4148         fsp->fh->private_options = 0;
4149         /*
4150          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4151          */
4152         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4153         fsp->print_file = NULL;
4154         fsp->modified = False;
4155         fsp->oplock_type = NO_OPLOCK;
4156         fsp->sent_oplock_break = NO_BREAK_SENT;
4157         fsp->is_directory = True;
4158         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4159                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4160         }
4161         status = fsp_set_smb_fname(fsp, smb_dname);
4162         if (!NT_STATUS_IS_OK(status)) {
4163                 file_free(req, fsp);
4164                 return status;
4165         }
4166
4167         /* Don't store old timestamps for directory
4168            handles in the internal database. We don't
4169            update them in there if new objects
4170            are creaded in the directory. Currently
4171            we only update timestamps on file writes.
4172            See bug #9870.
4173         */
4174         ZERO_STRUCT(mtimespec);
4175
4176         if (access_mask & (FILE_LIST_DIRECTORY|
4177                            FILE_ADD_FILE|
4178                            FILE_ADD_SUBDIRECTORY|
4179                            FILE_TRAVERSE|
4180                            DELETE_ACCESS|
4181                            FILE_DELETE_CHILD)) {
4182 #ifdef O_DIRECTORY
4183                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4184 #else
4185                 /* POSIX allows us to open a directory with O_RDONLY. */
4186                 status = fd_open(conn, fsp, O_RDONLY, 0);
4187 #endif
4188                 if (!NT_STATUS_IS_OK(status)) {
4189                         DEBUG(5, ("open_directory: Could not open fd for "
4190                                 "%s (%s)\n",
4191                                 smb_fname_str_dbg(smb_dname),
4192                                 nt_errstr(status)));
4193                         file_free(req, fsp);
4194                         return status;
4195                 }
4196         } else {
4197                 fsp->fh->fd = -1;
4198                 DEBUG(10, ("Not opening Directory %s\n",
4199                         smb_fname_str_dbg(smb_dname)));
4200         }
4201
4202         status = vfs_stat_fsp(fsp);
4203         if (!NT_STATUS_IS_OK(status)) {
4204                 fd_close(fsp);
4205                 file_free(req, fsp);
4206                 return status;
4207         }
4208
4209         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4210                 DEBUG(5,("open_directory: %s is not a directory !\n",
4211                          smb_fname_str_dbg(smb_dname)));
4212                 fd_close(fsp);
4213                 file_free(req, fsp);
4214                 return NT_STATUS_NOT_A_DIRECTORY;
4215         }
4216
4217         /* Ensure there was no race condition.  We need to check
4218          * dev/inode but not permissions, as these can change
4219          * legitimately */
4220         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4221                 DEBUG(5,("open_directory: stat struct differs for "
4222                         "directory %s.\n",
4223                         smb_fname_str_dbg(smb_dname)));
4224                 fd_close(fsp);
4225                 file_free(req, fsp);
4226                 return NT_STATUS_ACCESS_DENIED;
4227         }
4228
4229         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4230                                   conn->connectpath, smb_dname,
4231                                   &mtimespec);
4232
4233         if (lck == NULL) {
4234                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4235                           "%s\n", smb_fname_str_dbg(smb_dname)));
4236                 fd_close(fsp);
4237                 file_free(req, fsp);
4238                 return NT_STATUS_SHARING_VIOLATION;
4239         }
4240
4241         if (has_delete_on_close(lck, fsp->name_hash)) {
4242                 TALLOC_FREE(lck);
4243                 fd_close(fsp);
4244                 file_free(req, fsp);
4245                 return NT_STATUS_DELETE_PENDING;
4246         }
4247
4248         status = open_mode_check(conn, lck,
4249                                  access_mask, share_access);
4250
4251         if (!NT_STATUS_IS_OK(status)) {
4252                 TALLOC_FREE(lck);
4253                 fd_close(fsp);
4254                 file_free(req, fsp);
4255                 return status;
4256         }
4257
4258         ok = set_share_mode(lck, fsp, get_current_uid(conn),
4259                             req ? req->mid : 0, NO_OPLOCK,
4260                             UINT32_MAX);
4261         if (!ok) {
4262                 TALLOC_FREE(lck);
4263                 fd_close(fsp);
4264                 file_free(req, fsp);
4265                 return NT_STATUS_NO_MEMORY;
4266         }
4267
4268         /* For directories the delete on close bit at open time seems
4269            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4270         if (create_options & FILE_DELETE_ON_CLOSE) {
4271                 status = can_set_delete_on_close(fsp, 0);
4272                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4273                         del_share_mode(lck, fsp);
4274                         TALLOC_FREE(lck);
4275                         fd_close(fsp);
4276                         file_free(req, fsp);
4277                         return status;
4278                 }
4279
4280                 if (NT_STATUS_IS_OK(status)) {
4281                         /* Note that here we set the *inital* delete on close flag,
4282                            not the regular one. The magic gets handled in close. */
4283                         fsp->initial_delete_on_close = True;
4284                 }
4285         }
4286
4287         {
4288                 /*
4289                  * Deal with other opens having a modified write time. Is this
4290                  * possible for directories?
4291                  */
4292                 struct timespec write_time = get_share_mode_write_time(lck);
4293
4294                 if (!null_timespec(write_time)) {
4295                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4296                 }
4297         }
4298
4299         TALLOC_FREE(lck);
4300
4301         if (pinfo) {
4302                 *pinfo = info;
4303         }
4304
4305         *result = fsp;
4306         return NT_STATUS_OK;
4307 }
4308
4309 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4310                           struct smb_filename *smb_dname)
4311 {
4312         NTSTATUS status;
4313         files_struct *fsp;
4314
4315         status = SMB_VFS_CREATE_FILE(
4316                 conn,                                   /* conn */
4317                 req,                                    /* req */
4318                 0,                                      /* root_dir_fid */
4319                 smb_dname,                              /* fname */
4320                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4321                 FILE_SHARE_NONE,                        /* share_access */
4322                 FILE_CREATE,                            /* create_disposition*/
4323                 FILE_DIRECTORY_FILE,                    /* create_options */
4324                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4325                 0,                                      /* oplock_request */
4326                 NULL,                                   /* lease */
4327                 0,                                      /* allocation_size */
4328                 0,                                      /* private_flags */
4329                 NULL,                                   /* sd */
4330                 NULL,                                   /* ea_list */
4331                 &fsp,                                   /* result */
4332                 NULL,                                   /* pinfo */
4333                 NULL, NULL);                            /* create context */
4334
4335         if (NT_STATUS_IS_OK(status)) {
4336                 close_file(req, fsp, NORMAL_CLOSE);
4337         }
4338
4339         return status;
4340 }
4341
4342 /****************************************************************************
4343  Receive notification that one of our open files has been renamed by another
4344  smbd process.
4345 ****************************************************************************/
4346
4347 void msg_file_was_renamed(struct messaging_context *msg,
4348                           void *private_data,
4349                           uint32_t msg_type,
4350                           struct server_id server_id,
4351                           DATA_BLOB *data)
4352 {
4353         files_struct *fsp;
4354         char *frm = (char *)data->data;
4355         struct file_id id;
4356         const char *sharepath;
4357         const char *base_name;
4358         const char *stream_name;
4359         struct smb_filename *smb_fname = NULL;
4360         size_t sp_len, bn_len;
4361         NTSTATUS status;
4362         struct smbd_server_connection *sconn =
4363                 talloc_get_type_abort(private_data,
4364                 struct smbd_server_connection);
4365
4366         if (data->data == NULL
4367             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
4368                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
4369                           (int)data->length));
4370                 return;
4371         }
4372
4373         /* Unpack the message. */
4374         pull_file_id_24(frm, &id);
4375         sharepath = &frm[24];
4376         sp_len = strlen(sharepath);
4377         base_name = sharepath + sp_len + 1;
4378         bn_len = strlen(base_name);
4379         stream_name = sharepath + sp_len + 1 + bn_len + 1;
4380
4381         /* stream_name must always be NULL if there is no stream. */
4382         if (stream_name[0] == '\0') {
4383                 stream_name = NULL;
4384         }
4385
4386         smb_fname = synthetic_smb_fname(talloc_tos(),
4387                                         base_name,
4388                                         stream_name,
4389                                         NULL,
4390                                         0);
4391         if (smb_fname == NULL) {
4392                 return;
4393         }
4394
4395         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
4396                 "file_id %s\n",
4397                 sharepath, smb_fname_str_dbg(smb_fname),
4398                 file_id_string_tos(&id)));
4399
4400         for(fsp = file_find_di_first(sconn, id); fsp;
4401             fsp = file_find_di_next(fsp)) {
4402                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
4403
4404                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
4405                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
4406                                 smb_fname_str_dbg(smb_fname)));
4407                         status = fsp_set_smb_fname(fsp, smb_fname);
4408                         if (!NT_STATUS_IS_OK(status)) {
4409                                 goto out;
4410                         }
4411                 } else {
4412                         /* TODO. JRA. */
4413                         /* Now we have the complete path we can work out if this is
4414                            actually within this share and adjust newname accordingly. */
4415                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
4416                                 "not sharepath %s) "
4417                                 "%s from %s -> %s\n",
4418                                 fsp->conn->connectpath,
4419                                 sharepath,
4420                                 fsp_fnum_dbg(fsp),
4421                                 fsp_str_dbg(fsp),
4422                                 smb_fname_str_dbg(smb_fname)));
4423                 }
4424         }
4425  out:
4426         TALLOC_FREE(smb_fname);
4427         return;
4428 }
4429
4430 /*
4431  * If a main file is opened for delete, all streams need to be checked for
4432  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4433  * If that works, delete them all by setting the delete on close and close.
4434  */
4435
4436 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4437                                         const struct smb_filename *smb_fname)
4438 {
4439         struct stream_struct *stream_info = NULL;
4440         files_struct **streams = NULL;
4441         int i;
4442         unsigned int num_streams = 0;
4443         TALLOC_CTX *frame = talloc_stackframe();
4444         NTSTATUS status;
4445
4446         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4447                                 &num_streams, &stream_info);
4448
4449         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4450             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4451                 DEBUG(10, ("no streams around\n"));
4452                 TALLOC_FREE(frame);
4453                 return NT_STATUS_OK;
4454         }
4455
4456         if (!NT_STATUS_IS_OK(status)) {
4457                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4458                            nt_errstr(status)));
4459                 goto fail;
4460         }
4461
4462         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4463                    num_streams));
4464
4465         if (num_streams == 0) {
4466                 TALLOC_FREE(frame);
4467                 return NT_STATUS_OK;
4468         }
4469
4470         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4471         if (streams == NULL) {
4472                 DEBUG(0, ("talloc failed\n"));
4473                 status = NT_STATUS_NO_MEMORY;
4474                 goto fail;
4475         }
4476
4477         for (i=0; i<num_streams; i++) {
4478                 struct smb_filename *smb_fname_cp;
4479
4480                 if (strequal(stream_info[i].name, "::$DATA")) {
4481                         streams[i] = NULL;
4482                         continue;
4483                 }
4484
4485                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4486                                         smb_fname->base_name,
4487                                         stream_info[i].name,
4488                                         NULL,
4489                                         (smb_fname->flags &
4490                                                 ~SMB_FILENAME_POSIX_PATH));
4491                 if (smb_fname_cp == NULL) {
4492                         status = NT_STATUS_NO_MEMORY;
4493                         goto fail;
4494                 }
4495
4496                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4497                         DEBUG(10, ("Unable to stat stream: %s\n",
4498                                    smb_fname_str_dbg(smb_fname_cp)));
4499                 }
4500
4501                 status = SMB_VFS_CREATE_FILE(
4502                          conn,                  /* conn */
4503                          NULL,                  /* req */
4504                          0,                     /* root_dir_fid */
4505                          smb_fname_cp,          /* fname */
4506                          DELETE_ACCESS,         /* access_mask */
4507                          (FILE_SHARE_READ |     /* share_access */
4508                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4509                          FILE_OPEN,             /* create_disposition*/
4510                          0,                     /* create_options */
4511                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4512                          0,                     /* oplock_request */
4513                          NULL,                  /* lease */
4514                          0,                     /* allocation_size */
4515                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4516                          NULL,                  /* sd */
4517                          NULL,                  /* ea_list */
4518                          &streams[i],           /* result */
4519                          NULL,                  /* pinfo */
4520                          NULL, NULL);           /* create context */
4521
4522                 if (!NT_STATUS_IS_OK(status)) {
4523                         DEBUG(10, ("Could not open stream %s: %s\n",
4524                                    smb_fname_str_dbg(smb_fname_cp),
4525                                    nt_errstr(status)));
4526
4527                         TALLOC_FREE(smb_fname_cp);
4528                         break;
4529                 }
4530                 TALLOC_FREE(smb_fname_cp);
4531         }
4532
4533         /*
4534          * don't touch the variable "status" beyond this point :-)
4535          */
4536
4537         for (i -= 1 ; i >= 0; i--) {
4538                 if (streams[i] == NULL) {
4539                         continue;
4540                 }
4541
4542                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4543                            fsp_str_dbg(streams[i])));
4544                 close_file(NULL, streams[i], NORMAL_CLOSE);
4545         }
4546
4547  fail:
4548         TALLOC_FREE(frame);
4549         return status;
4550 }
4551
4552 /*********************************************************************
4553  Create a default ACL by inheriting from the parent. If no inheritance
4554  from the parent available, don't set anything. This will leave the actual
4555  permissions the new file or directory already got from the filesystem
4556  as the NT ACL when read.
4557 *********************************************************************/
4558
4559 static NTSTATUS inherit_new_acl(files_struct *fsp)
4560 {
4561         TALLOC_CTX *frame = talloc_stackframe();
4562         char *parent_name = NULL;
4563         struct security_descriptor *parent_desc = NULL;
4564         NTSTATUS status = NT_STATUS_OK;
4565         struct security_descriptor *psd = NULL;
4566         const struct dom_sid *owner_sid = NULL;
4567         const struct dom_sid *group_sid = NULL;
4568         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4569         struct security_token *token = fsp->conn->session_info->security_token;
4570         bool inherit_owner =
4571             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4572         bool inheritable_components = false;
4573         bool try_builtin_administrators = false;
4574         const struct dom_sid *BA_U_sid = NULL;
4575         const struct dom_sid *BA_G_sid = NULL;
4576         bool try_system = false;
4577         const struct dom_sid *SY_U_sid = NULL;
4578         const struct dom_sid *SY_G_sid = NULL;
4579         size_t size = 0;
4580         struct smb_filename *parent_smb_fname = NULL;
4581
4582         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4583                 TALLOC_FREE(frame);
4584                 return NT_STATUS_NO_MEMORY;
4585         }
4586         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4587                                                 parent_name,
4588                                                 NULL,
4589                                                 NULL,
4590                                                 fsp->fsp_name->flags);
4591
4592         if (parent_smb_fname == NULL) {
4593                 TALLOC_FREE(frame);
4594                 return NT_STATUS_NO_MEMORY;
4595         }
4596
4597         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4598                                     parent_smb_fname,
4599                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4600                                     frame,
4601                                     &parent_desc);
4602         if (!NT_STATUS_IS_OK(status)) {
4603                 TALLOC_FREE(frame);
4604                 return status;
4605         }
4606
4607         inheritable_components = sd_has_inheritable_components(parent_desc,
4608                                         fsp->is_directory);
4609
4610         if (!inheritable_components && !inherit_owner) {
4611                 TALLOC_FREE(frame);
4612                 /* Nothing to inherit and not setting owner. */
4613                 return NT_STATUS_OK;
4614         }
4615
4616         /* Create an inherited descriptor from the parent. */
4617
4618         if (DEBUGLEVEL >= 10) {
4619                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4620                         fsp_str_dbg(fsp) ));
4621                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4622         }
4623
4624         /* Inherit from parent descriptor if "inherit owner" set. */
4625         if (inherit_owner) {
4626                 owner_sid = parent_desc->owner_sid;
4627                 group_sid = parent_desc->group_sid;
4628         }
4629
4630         if (owner_sid == NULL) {
4631                 if (security_token_has_builtin_administrators(token)) {
4632                         try_builtin_administrators = true;
4633                 } else if (security_token_is_system(token)) {
4634                         try_builtin_administrators = true;
4635                         try_system = true;
4636                 }
4637         }
4638
4639         if (group_sid == NULL &&
4640             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4641         {
4642                 if (security_token_is_system(token)) {
4643                         try_builtin_administrators = true;
4644                         try_system = true;
4645                 }
4646         }
4647
4648         if (try_builtin_administrators) {
4649                 struct unixid ids;
4650                 bool ok;
4651
4652                 ZERO_STRUCT(ids);
4653                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4654                 if (ok) {
4655                         switch (ids.type) {
4656                         case ID_TYPE_BOTH:
4657                                 BA_U_sid = &global_sid_Builtin_Administrators;
4658                                 BA_G_sid = &global_sid_Builtin_Administrators;
4659                                 break;
4660                         case ID_TYPE_UID:
4661                                 BA_U_sid = &global_sid_Builtin_Administrators;
4662                                 break;
4663                         case ID_TYPE_GID:
4664                                 BA_G_sid = &global_sid_Builtin_Administrators;
4665                                 break;
4666                         default:
4667                                 break;
4668                         }
4669                 }
4670         }
4671
4672         if (try_system) {
4673                 struct unixid ids;
4674                 bool ok;
4675
4676                 ZERO_STRUCT(ids);
4677                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4678                 if (ok) {
4679                         switch (ids.type) {
4680                         case ID_TYPE_BOTH:
4681                                 SY_U_sid = &global_sid_System;
4682                                 SY_G_sid = &global_sid_System;
4683                                 break;
4684                         case ID_TYPE_UID:
4685                                 SY_U_sid = &global_sid_System;
4686                                 break;
4687                         case ID_TYPE_GID:
4688                                 SY_G_sid = &global_sid_System;
4689                                 break;
4690                         default:
4691                                 break;
4692                         }
4693                 }
4694         }
4695
4696         if (owner_sid == NULL) {
4697                 owner_sid = BA_U_sid;
4698         }
4699
4700         if (owner_sid == NULL) {
4701                 owner_sid = SY_U_sid;
4702         }
4703
4704         if (group_sid == NULL) {
4705                 group_sid = SY_G_sid;
4706         }
4707
4708         if (try_system && group_sid == NULL) {
4709                 group_sid = BA_G_sid;
4710         }
4711
4712         if (owner_sid == NULL) {
4713                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4714         }
4715         if (group_sid == NULL) {
4716                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4717                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4718                 } else {
4719                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4720                 }
4721         }
4722
4723         status = se_create_child_secdesc(frame,
4724                         &psd,
4725                         &size,
4726                         parent_desc,
4727                         owner_sid,
4728                         group_sid,
4729                         fsp->is_directory);
4730         if (!NT_STATUS_IS_OK(status)) {
4731                 TALLOC_FREE(frame);
4732                 return status;
4733         }
4734
4735         /* If inheritable_components == false,
4736            se_create_child_secdesc()
4737            creates a security descriptor with a NULL dacl
4738            entry, but with SEC_DESC_DACL_PRESENT. We need
4739            to remove that flag. */
4740
4741         if (!inheritable_components) {
4742                 security_info_sent &= ~SECINFO_DACL;
4743                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4744         }
4745
4746         if (DEBUGLEVEL >= 10) {
4747                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4748                         fsp_str_dbg(fsp) ));
4749                 NDR_PRINT_DEBUG(security_descriptor, psd);
4750         }
4751
4752         if (inherit_owner) {
4753                 /* We need to be root to force this. */
4754                 become_root();
4755         }
4756         status = SMB_VFS_FSET_NT_ACL(fsp,
4757                         security_info_sent,
4758                         psd);
4759         if (inherit_owner) {
4760                 unbecome_root();
4761         }
4762         TALLOC_FREE(frame);
4763         return status;
4764 }
4765
4766 /*
4767  * If we already have a lease, it must match the new file id. [MS-SMB2]
4768  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4769  * used for a different file name.
4770  */
4771
4772 struct lease_match_state {
4773         /* Input parameters. */
4774         TALLOC_CTX *mem_ctx;
4775         const char *servicepath;
4776         const struct smb_filename *fname;
4777         bool file_existed;
4778         struct file_id id;
4779         /* Return parameters. */
4780         uint32_t num_file_ids;
4781         struct file_id *ids;
4782         NTSTATUS match_status;
4783 };
4784
4785 /*************************************************************
4786  File doesn't exist but this lease key+guid is already in use.
4787
4788  This is only allowable in the dynamic share case where the
4789  service path must be different.
4790
4791  There is a small race condition here in the multi-connection
4792  case where a client sends two create calls on different connections,
4793  where the file doesn't exist and one smbd creates the leases_db
4794  entry first, but this will get fixed by the multichannel cleanup
4795  when all identical client_guids get handled by a single smbd.
4796 **************************************************************/
4797
4798 static void lease_match_parser_new_file(
4799         uint32_t num_files,
4800         const struct leases_db_file *files,
4801         struct lease_match_state *state)
4802 {
4803         uint32_t i;
4804
4805         for (i = 0; i < num_files; i++) {
4806                 const struct leases_db_file *f = &files[i];
4807                 if (strequal(state->servicepath, f->servicepath)) {
4808                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4809                         return;
4810                 }
4811         }
4812
4813         /* Dynamic share case. Break leases on all other files. */
4814         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4815                                         num_files,
4816                                         files,
4817                                         &state->ids);
4818         if (!NT_STATUS_IS_OK(state->match_status)) {
4819                 return;
4820         }
4821
4822         state->num_file_ids = num_files;
4823         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4824         return;
4825 }
4826
4827 static void lease_match_parser(
4828         uint32_t num_files,
4829         const struct leases_db_file *files,
4830         void *private_data)
4831 {
4832         struct lease_match_state *state =
4833                 (struct lease_match_state *)private_data;
4834         uint32_t i;
4835
4836         if (!state->file_existed) {
4837                 /*
4838                  * Deal with name mismatch or
4839                  * possible dynamic share case separately
4840                  * to make code clearer.
4841                  */
4842                 lease_match_parser_new_file(num_files,
4843                                                 files,
4844                                                 state);
4845                 return;
4846         }
4847
4848         /* File existed. */
4849         state->match_status = NT_STATUS_OK;
4850
4851         for (i = 0; i < num_files; i++) {
4852                 const struct leases_db_file *f = &files[i];
4853
4854                 /* Everything should be the same. */
4855                 if (!file_id_equal(&state->id, &f->id)) {
4856                         /* This should catch all dynamic share cases. */
4857                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4858                         break;
4859                 }
4860                 if (!strequal(f->servicepath, state->servicepath)) {
4861                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4862                         break;
4863                 }
4864                 if (!strequal(f->base_name, state->fname->base_name)) {
4865                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4866                         break;
4867                 }
4868                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4869                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4870                         break;
4871                 }
4872         }
4873
4874         if (NT_STATUS_IS_OK(state->match_status)) {
4875                 /*
4876                  * Common case - just opening another handle on a
4877                  * file on a non-dynamic share.
4878                  */
4879                 return;
4880         }
4881
4882         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4883                 /* Mismatched path. Error back to client. */
4884                 return;
4885         }
4886
4887         /*
4888          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4889          * Don't allow leases.
4890          */
4891
4892         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4893                                         num_files,
4894                                         files,
4895                                         &state->ids);
4896         if (!NT_STATUS_IS_OK(state->match_status)) {
4897                 return;
4898         }
4899
4900         state->num_file_ids = num_files;
4901         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4902         return;
4903 }
4904
4905 static NTSTATUS lease_match(connection_struct *conn,
4906                             struct smb_request *req,
4907                             struct smb2_lease_key *lease_key,
4908                             const char *servicepath,
4909                             const struct smb_filename *fname,
4910                             uint16_t *p_version,
4911                             uint16_t *p_epoch)
4912 {
4913         struct smbd_server_connection *sconn = req->sconn;
4914         TALLOC_CTX *tos = talloc_tos();
4915         struct lease_match_state state = {
4916                 .mem_ctx = tos,
4917                 .servicepath = servicepath,
4918                 .fname = fname,
4919                 .match_status = NT_STATUS_OK
4920         };
4921         uint32_t i;
4922         NTSTATUS status;
4923
4924         state.file_existed = VALID_STAT(fname->st);
4925         if (state.file_existed) {
4926                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
4927         } else {
4928                 memset(&state.id, '\0', sizeof(state.id));
4929         }
4930
4931         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
4932                                  lease_key, lease_match_parser, &state);
4933         if (!NT_STATUS_IS_OK(status)) {
4934                 /*
4935                  * Not found or error means okay: We can make the lease pass
4936                  */
4937                 return NT_STATUS_OK;
4938         }
4939         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
4940                 /*
4941                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
4942                  * deal with it.
4943                  */
4944                 return state.match_status;
4945         }
4946
4947         /* We have to break all existing leases. */
4948         for (i = 0; i < state.num_file_ids; i++) {
4949                 struct share_mode_lock *lck;
4950                 struct share_mode_data *d;
4951                 uint32_t j;
4952
4953                 if (file_id_equal(&state.ids[i], &state.id)) {
4954                         /* Don't need to break our own file. */
4955                         continue;
4956                 }
4957
4958                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
4959                 if (lck == NULL) {
4960                         /* Race condition - file already closed. */
4961                         continue;
4962                 }
4963                 d = lck->data;
4964                 for (j=0; j<d->num_share_modes; j++) {
4965                         struct share_mode_entry *e = &d->share_modes[j];
4966                         uint32_t e_lease_type = get_lease_type(d, e);
4967                         struct share_mode_lease *l = NULL;
4968
4969                         if (share_mode_stale_pid(d, j)) {
4970                                 continue;
4971                         }
4972
4973                         if (e->op_type == LEASE_OPLOCK) {
4974                                 l = &lck->data->leases[e->lease_idx];
4975                                 if (!smb2_lease_key_equal(&l->lease_key,
4976                                                           lease_key)) {
4977                                         continue;
4978                                 }
4979                                 *p_epoch = l->epoch;
4980                                 *p_version = l->lease_version;
4981                         }
4982
4983                         if (e_lease_type == SMB2_LEASE_NONE) {
4984                                 continue;
4985                         }
4986
4987                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
4988                                            SMB2_LEASE_NONE);
4989
4990                         /*
4991                          * Windows 7 and 8 lease clients
4992                          * are broken in that they will not
4993                          * respond to lease break requests
4994                          * whilst waiting for an outstanding
4995                          * open request on that lease handle
4996                          * on the same TCP connection, due
4997                          * to holding an internal inode lock.
4998                          *
4999                          * This means we can't reschedule
5000                          * ourselves here, but must return
5001                          * from the create.
5002                          *
5003                          * Work around:
5004                          *
5005                          * Send the breaks and then return
5006                          * SMB2_LEASE_NONE in the lease handle
5007                          * to cause them to acknowledge the
5008                          * lease break. Consulatation with
5009                          * Microsoft engineering confirmed
5010                          * this approach is safe.
5011                          */
5012
5013                 }
5014                 TALLOC_FREE(lck);
5015         }
5016         /*
5017          * Ensure we don't grant anything more so we
5018          * never upgrade.
5019          */
5020         return NT_STATUS_OPLOCK_NOT_GRANTED;
5021 }
5022
5023 /*
5024  * Wrapper around open_file_ntcreate and open_directory
5025  */
5026
5027 static NTSTATUS create_file_unixpath(connection_struct *conn,
5028                                      struct smb_request *req,
5029                                      struct smb_filename *smb_fname,
5030                                      uint32_t access_mask,
5031                                      uint32_t share_access,
5032                                      uint32_t create_disposition,
5033                                      uint32_t create_options,
5034                                      uint32_t file_attributes,
5035                                      uint32_t oplock_request,
5036                                      struct smb2_lease *lease,
5037                                      uint64_t allocation_size,
5038                                      uint32_t private_flags,
5039                                      struct security_descriptor *sd,
5040                                      struct ea_list *ea_list,
5041
5042                                      files_struct **result,
5043                                      int *pinfo)
5044 {
5045         int info = FILE_WAS_OPENED;
5046         files_struct *base_fsp = NULL;
5047         files_struct *fsp = NULL;
5048         NTSTATUS status;
5049
5050         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5051                   "file_attributes = 0x%x, share_access = 0x%x, "
5052                   "create_disposition = 0x%x create_options = 0x%x "
5053                   "oplock_request = 0x%x private_flags = 0x%x "
5054                   "ea_list = %p, sd = %p, "
5055                   "fname = %s\n",
5056                   (unsigned int)access_mask,
5057                   (unsigned int)file_attributes,
5058                   (unsigned int)share_access,
5059                   (unsigned int)create_disposition,
5060                   (unsigned int)create_options,
5061                   (unsigned int)oplock_request,
5062                   (unsigned int)private_flags,
5063                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5064
5065         if (create_options & FILE_OPEN_BY_FILE_ID) {
5066                 status = NT_STATUS_NOT_SUPPORTED;
5067                 goto fail;
5068         }
5069
5070         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5071                 status = NT_STATUS_INVALID_PARAMETER;
5072                 goto fail;
5073         }
5074
5075         if (req == NULL) {
5076                 oplock_request |= INTERNAL_OPEN_ONLY;
5077         }
5078
5079         if (lease != NULL) {
5080                 uint16_t epoch = lease->lease_epoch;
5081                 uint16_t version = lease->lease_version;
5082
5083                 if (req == NULL) {
5084                         DBG_WARNING("Got lease on internal open\n");
5085                         status = NT_STATUS_INTERNAL_ERROR;
5086                         goto fail;
5087                 }
5088
5089                 status = lease_match(conn,
5090                                 req,
5091                                 &lease->lease_key,
5092                                 conn->connectpath,
5093                                 smb_fname,
5094                                 &version,
5095                                 &epoch);
5096                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5097                         /* Dynamic share file. No leases and update epoch... */
5098                         lease->lease_state = SMB2_LEASE_NONE;
5099                         lease->lease_epoch = epoch;
5100                         lease->lease_version = version;
5101                 } else if (!NT_STATUS_IS_OK(status)) {
5102                         goto fail;
5103                 }
5104         }
5105
5106         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5107             && (access_mask & DELETE_ACCESS)
5108             && !is_ntfs_stream_smb_fname(smb_fname)) {
5109                 /*
5110                  * We can't open a file with DELETE access if any of the
5111                  * streams is open without FILE_SHARE_DELETE
5112                  */
5113                 status = open_streams_for_delete(conn, smb_fname);
5114
5115                 if (!NT_STATUS_IS_OK(status)) {
5116                         goto fail;
5117                 }
5118         }
5119
5120         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5121                         !security_token_has_privilege(get_current_nttok(conn),
5122                                         SEC_PRIV_SECURITY)) {
5123                 DEBUG(10, ("create_file_unixpath: open on %s "
5124                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5125                         smb_fname_str_dbg(smb_fname)));
5126                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5127                 goto fail;
5128         }
5129
5130         /*
5131          * Files or directories can't be opened DELETE_ON_CLOSE without
5132          * delete access.
5133          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5134          */
5135         if (create_options & FILE_DELETE_ON_CLOSE) {
5136                 if ((access_mask & DELETE_ACCESS) == 0) {
5137                         status = NT_STATUS_INVALID_PARAMETER;
5138                         goto fail;
5139                 }
5140         }
5141
5142         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5143             && is_ntfs_stream_smb_fname(smb_fname)
5144             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5145                 uint32_t base_create_disposition;
5146                 struct smb_filename *smb_fname_base = NULL;
5147
5148                 if (create_options & FILE_DIRECTORY_FILE) {
5149                         status = NT_STATUS_NOT_A_DIRECTORY;
5150                         goto fail;
5151                 }
5152
5153                 switch (create_disposition) {
5154                 case FILE_OPEN:
5155                         base_create_disposition = FILE_OPEN;
5156                         break;
5157                 default:
5158                         base_create_disposition = FILE_OPEN_IF;
5159                         break;
5160                 }
5161
5162                 /* Create an smb_filename with stream_name == NULL. */
5163                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5164                                                 smb_fname->base_name,
5165                                                 NULL,
5166                                                 NULL,
5167                                                 smb_fname->flags);
5168                 if (smb_fname_base == NULL) {
5169                         status = NT_STATUS_NO_MEMORY;
5170                         goto fail;
5171                 }
5172
5173                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5174                         DEBUG(10, ("Unable to stat stream: %s\n",
5175                                    smb_fname_str_dbg(smb_fname_base)));
5176                 } else {
5177                         /*
5178                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5179                          * We need to check if the requested access mask
5180                          * could be used to open the underlying file (if
5181                          * it existed), as we're passing in zero for the
5182                          * access mask to the base filename.
5183                          */
5184                         status = check_base_file_access(conn,
5185                                                         smb_fname_base,
5186                                                         access_mask);
5187
5188                         if (!NT_STATUS_IS_OK(status)) {
5189                                 DEBUG(10, ("Permission check "
5190                                         "for base %s failed: "
5191                                         "%s\n", smb_fname->base_name,
5192                                         nt_errstr(status)));
5193                                 goto fail;
5194                         }
5195                 }
5196
5197                 /* Open the base file. */
5198                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5199                                               FILE_SHARE_READ
5200                                               | FILE_SHARE_WRITE
5201                                               | FILE_SHARE_DELETE,
5202                                               base_create_disposition,
5203                                               0, 0, 0, NULL, 0, 0, NULL, NULL,
5204                                               &base_fsp, NULL);
5205                 TALLOC_FREE(smb_fname_base);
5206
5207                 if (!NT_STATUS_IS_OK(status)) {
5208                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5209                                    "%s\n", smb_fname->base_name,
5210                                    nt_errstr(status)));
5211                         goto fail;
5212                 }
5213                 /* we don't need the low level fd */
5214                 fd_close(base_fsp);
5215         }
5216
5217         /*
5218          * If it's a request for a directory open, deal with it separately.
5219          */
5220
5221         if (create_options & FILE_DIRECTORY_FILE) {
5222
5223                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5224                         status = NT_STATUS_INVALID_PARAMETER;
5225                         goto fail;
5226                 }
5227
5228                 /* Can't open a temp directory. IFS kit test. */
5229                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5230                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5231                         status = NT_STATUS_INVALID_PARAMETER;
5232                         goto fail;
5233                 }
5234
5235                 /*
5236                  * We will get a create directory here if the Win32
5237                  * app specified a security descriptor in the
5238                  * CreateDirectory() call.
5239                  */
5240
5241                 oplock_request = 0;
5242                 status = open_directory(
5243                         conn, req, smb_fname, access_mask, share_access,
5244                         create_disposition, create_options, file_attributes,
5245                         &info, &fsp);
5246         } else {
5247
5248                 /*
5249                  * Ordinary file case.
5250                  */
5251
5252                 status = file_new(req, conn, &fsp);
5253                 if(!NT_STATUS_IS_OK(status)) {
5254                         goto fail;
5255                 }
5256
5257                 status = fsp_set_smb_fname(fsp, smb_fname);
5258                 if (!NT_STATUS_IS_OK(status)) {
5259                         goto fail;
5260                 }
5261
5262                 if (base_fsp) {
5263                         /*
5264                          * We're opening the stream element of a
5265                          * base_fsp we already opened. Set up the
5266                          * base_fsp pointer.
5267                          */
5268                         fsp->base_fsp = base_fsp;
5269                 }
5270
5271                 if (allocation_size) {
5272                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5273                                                         allocation_size);
5274                 }
5275
5276                 status = open_file_ntcreate(conn,
5277                                             req,
5278                                             access_mask,
5279                                             share_access,
5280                                             create_disposition,
5281                                             create_options,
5282                                             file_attributes,
5283                                             oplock_request,
5284                                             lease,
5285                                             private_flags,
5286                                             &info,
5287                                             fsp);
5288
5289                 if(!NT_STATUS_IS_OK(status)) {
5290                         file_free(req, fsp);
5291                         fsp = NULL;
5292                 }
5293
5294                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5295
5296                         /* A stream open never opens a directory */
5297
5298                         if (base_fsp) {
5299                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5300                                 goto fail;
5301                         }
5302
5303                         /*
5304                          * Fail the open if it was explicitly a non-directory
5305                          * file.
5306                          */
5307
5308                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5309                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5310                                 goto fail;
5311                         }
5312
5313                         oplock_request = 0;
5314                         status = open_directory(
5315                                 conn, req, smb_fname, access_mask,
5316                                 share_access, create_disposition,
5317                                 create_options, file_attributes,
5318                                 &info, &fsp);
5319                 }
5320         }
5321
5322         if (!NT_STATUS_IS_OK(status)) {
5323                 goto fail;
5324         }
5325
5326         fsp->base_fsp = base_fsp;
5327
5328         if ((ea_list != NULL) &&
5329             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5330                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5331                 if (!NT_STATUS_IS_OK(status)) {
5332                         goto fail;
5333                 }
5334         }
5335
5336         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5337                 status = NT_STATUS_ACCESS_DENIED;
5338                 goto fail;
5339         }
5340
5341         /* Save the requested allocation size. */
5342         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5343                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5344                     && !(fsp->is_directory))
5345                 {
5346                         fsp->initial_allocation_size = smb_roundup(
5347                                 fsp->conn, allocation_size);
5348                         if (vfs_allocate_file_space(
5349                                     fsp, fsp->initial_allocation_size) == -1) {
5350                                 status = NT_STATUS_DISK_FULL;
5351                                 goto fail;
5352                         }
5353                 } else {
5354                         fsp->initial_allocation_size = smb_roundup(
5355                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5356                 }
5357         } else {
5358                 fsp->initial_allocation_size = 0;
5359         }
5360
5361         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5362                                 fsp->base_fsp == NULL) {
5363                 if (sd != NULL) {
5364                         /*
5365                          * According to the MS documentation, the only time the security
5366                          * descriptor is applied to the opened file is iff we *created* the
5367                          * file; an existing file stays the same.
5368                          *
5369                          * Also, it seems (from observation) that you can open the file with
5370                          * any access mask but you can still write the sd. We need to override
5371                          * the granted access before we call set_sd
5372                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5373                          */
5374
5375                         uint32_t sec_info_sent;
5376                         uint32_t saved_access_mask = fsp->access_mask;
5377
5378                         sec_info_sent = get_sec_info(sd);
5379
5380                         fsp->access_mask = FILE_GENERIC_ALL;
5381
5382                         if (sec_info_sent & (SECINFO_OWNER|
5383                                                 SECINFO_GROUP|
5384                                                 SECINFO_DACL|
5385                                                 SECINFO_SACL)) {
5386                                 status = set_sd(fsp, sd, sec_info_sent);
5387                         }
5388
5389                         fsp->access_mask = saved_access_mask;
5390
5391                         if (!NT_STATUS_IS_OK(status)) {
5392                                 goto fail;
5393                         }
5394                 } else if (lp_inherit_acls(SNUM(conn))) {
5395                         /* Inherit from parent. Errors here are not fatal. */
5396                         status = inherit_new_acl(fsp);
5397                         if (!NT_STATUS_IS_OK(status)) {
5398                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5399                                         fsp_str_dbg(fsp),
5400                                         nt_errstr(status) ));
5401                         }
5402                 }
5403         }
5404
5405         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5406          && (create_options & FILE_NO_COMPRESSION)
5407          && (info == FILE_WAS_CREATED)) {
5408                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5409                                                  COMPRESSION_FORMAT_NONE);
5410                 if (!NT_STATUS_IS_OK(status)) {
5411                         DEBUG(1, ("failed to disable compression: %s\n",
5412                                   nt_errstr(status)));
5413                 }
5414         }
5415
5416         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5417
5418         *result = fsp;
5419         if (pinfo != NULL) {
5420                 *pinfo = info;
5421         }
5422
5423         smb_fname->st = fsp->fsp_name->st;
5424
5425         return NT_STATUS_OK;
5426
5427  fail:
5428         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5429
5430         if (fsp != NULL) {
5431                 if (base_fsp && fsp->base_fsp == base_fsp) {
5432                         /*
5433                          * The close_file below will close
5434                          * fsp->base_fsp.
5435                          */
5436                         base_fsp = NULL;
5437                 }
5438                 close_file(req, fsp, ERROR_CLOSE);
5439                 fsp = NULL;
5440         }
5441         if (base_fsp != NULL) {
5442                 close_file(req, base_fsp, ERROR_CLOSE);
5443                 base_fsp = NULL;
5444         }
5445         return status;
5446 }
5447
5448 /*
5449  * Calculate the full path name given a relative fid.
5450  */
5451 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5452                                    struct smb_request *req,
5453                                    uint16_t root_dir_fid,
5454                                    const struct smb_filename *smb_fname,
5455                                    struct smb_filename **smb_fname_out)
5456 {
5457         files_struct *dir_fsp;
5458         char *parent_fname = NULL;
5459         char *new_base_name = NULL;
5460         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5461         NTSTATUS status;
5462
5463         if (root_dir_fid == 0 || !smb_fname) {
5464                 status = NT_STATUS_INTERNAL_ERROR;
5465                 goto out;
5466         }
5467
5468         dir_fsp = file_fsp(req, root_dir_fid);
5469
5470         if (dir_fsp == NULL) {
5471                 status = NT_STATUS_INVALID_HANDLE;
5472                 goto out;
5473         }
5474
5475         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5476                 status = NT_STATUS_INVALID_HANDLE;
5477                 goto out;
5478         }
5479
5480         if (!dir_fsp->is_directory) {
5481
5482                 /*
5483                  * Check to see if this is a mac fork of some kind.
5484                  */
5485
5486                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5487                     is_ntfs_stream_smb_fname(smb_fname)) {
5488                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5489                         goto out;
5490                 }
5491
5492                 /*
5493                   we need to handle the case when we get a
5494                   relative open relative to a file and the
5495                   pathname is blank - this is a reopen!
5496                   (hint from demyn plantenberg)
5497                 */
5498
5499                 status = NT_STATUS_INVALID_HANDLE;
5500                 goto out;
5501         }
5502
5503         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5504                 /*
5505                  * We're at the toplevel dir, the final file name
5506                  * must not contain ./, as this is filtered out
5507                  * normally by srvstr_get_path and unix_convert
5508                  * explicitly rejects paths containing ./.
5509                  */
5510                 parent_fname = talloc_strdup(talloc_tos(), "");
5511                 if (parent_fname == NULL) {
5512                         status = NT_STATUS_NO_MEMORY;
5513                         goto out;
5514                 }
5515         } else {
5516                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5517
5518                 /*
5519                  * Copy in the base directory name.
5520                  */
5521
5522                 parent_fname = talloc_array(talloc_tos(), char,
5523                     dir_name_len+2);
5524                 if (parent_fname == NULL) {
5525                         status = NT_STATUS_NO_MEMORY;
5526                         goto out;
5527                 }
5528                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5529                     dir_name_len+1);
5530
5531                 /*
5532                  * Ensure it ends in a '/'.
5533                  * We used TALLOC_SIZE +2 to add space for the '/'.
5534                  */
5535
5536                 if(dir_name_len
5537                     && (parent_fname[dir_name_len-1] != '\\')
5538                     && (parent_fname[dir_name_len-1] != '/')) {
5539                         parent_fname[dir_name_len] = '/';
5540                         parent_fname[dir_name_len+1] = '\0';
5541                 }
5542         }
5543
5544         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5545                                         smb_fname->base_name);
5546         if (new_base_name == NULL) {
5547                 status = NT_STATUS_NO_MEMORY;
5548                 goto out;
5549         }
5550
5551         status = filename_convert(req,
5552                                 conn,
5553                                 new_base_name,
5554                                 ucf_flags,
5555                                 NULL,
5556                                 smb_fname_out);
5557         if (!NT_STATUS_IS_OK(status)) {
5558                 goto out;
5559         }
5560
5561  out:
5562         TALLOC_FREE(parent_fname);
5563         TALLOC_FREE(new_base_name);
5564         return status;
5565 }
5566
5567 NTSTATUS create_file_default(connection_struct *conn,
5568                              struct smb_request *req,
5569                              uint16_t root_dir_fid,
5570                              struct smb_filename *smb_fname,
5571                              uint32_t access_mask,
5572                              uint32_t share_access,
5573                              uint32_t create_disposition,
5574                              uint32_t create_options,
5575                              uint32_t file_attributes,
5576                              uint32_t oplock_request,
5577                              struct smb2_lease *lease,
5578                              uint64_t allocation_size,
5579                              uint32_t private_flags,
5580                              struct security_descriptor *sd,
5581                              struct ea_list *ea_list,
5582                              files_struct **result,
5583                              int *pinfo,
5584                              const struct smb2_create_blobs *in_context_blobs,
5585                              struct smb2_create_blobs *out_context_blobs)
5586 {
5587         int info = FILE_WAS_OPENED;
5588         files_struct *fsp = NULL;
5589         NTSTATUS status;
5590         bool stream_name = false;
5591
5592         DBG_DEBUG("create_file: access_mask = 0x%x "
5593                   "file_attributes = 0x%x, share_access = 0x%x, "
5594                   "create_disposition = 0x%x create_options = 0x%x "
5595                   "oplock_request = 0x%x "
5596                   "private_flags = 0x%x "
5597                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5598                   "fname = %s\n",
5599                   (unsigned int)access_mask,
5600                   (unsigned int)file_attributes,
5601                   (unsigned int)share_access,
5602                   (unsigned int)create_disposition,
5603                   (unsigned int)create_options,
5604                   (unsigned int)oplock_request,
5605                   (unsigned int)private_flags,
5606                   (unsigned int)root_dir_fid,
5607                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5608
5609         /*
5610          * Calculate the filename from the root_dir_if if necessary.
5611          */
5612
5613         if (root_dir_fid != 0) {
5614                 struct smb_filename *smb_fname_out = NULL;
5615                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5616                                                    smb_fname, &smb_fname_out);
5617                 if (!NT_STATUS_IS_OK(status)) {
5618                         goto fail;
5619                 }
5620                 smb_fname = smb_fname_out;
5621         }
5622
5623         /*
5624          * Check to see if this is a mac fork of some kind.
5625          */
5626
5627         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5628         if (stream_name) {
5629                 enum FAKE_FILE_TYPE fake_file_type;
5630
5631                 fake_file_type = is_fake_file(smb_fname);
5632
5633                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5634
5635                         /*
5636                          * Here we go! support for changing the disk quotas
5637                          * --metze
5638                          *
5639                          * We need to fake up to open this MAGIC QUOTA file
5640                          * and return a valid FID.
5641                          *
5642                          * w2k close this file directly after openening xp
5643                          * also tries a QUERY_FILE_INFO on the file and then
5644                          * close it
5645                          */
5646                         status = open_fake_file(req, conn, req->vuid,
5647                                                 fake_file_type, smb_fname,
5648                                                 access_mask, &fsp);
5649                         if (!NT_STATUS_IS_OK(status)) {
5650                                 goto fail;
5651                         }
5652
5653                         ZERO_STRUCT(smb_fname->st);
5654                         goto done;
5655                 }
5656
5657                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5658                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5659                         goto fail;
5660                 }
5661         }
5662
5663         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5664                 int ret;
5665                 smb_fname->stream_name = NULL;
5666                 /* We have to handle this error here. */
5667                 if (create_options & FILE_DIRECTORY_FILE) {
5668                         status = NT_STATUS_NOT_A_DIRECTORY;
5669                         goto fail;
5670                 }
5671                 if (req != NULL && req->posix_pathnames) {
5672                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5673                 } else {
5674                         ret = SMB_VFS_STAT(conn, smb_fname);
5675                 }
5676
5677                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5678                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5679                         goto fail;
5680                 }
5681         }
5682
5683         status = create_file_unixpath(
5684                 conn, req, smb_fname, access_mask, share_access,
5685                 create_disposition, create_options, file_attributes,
5686                 oplock_request, lease, allocation_size, private_flags,
5687                 sd, ea_list,
5688                 &fsp, &info);
5689
5690         if (!NT_STATUS_IS_OK(status)) {
5691                 goto fail;
5692         }
5693
5694  done:
5695         DEBUG(10, ("create_file: info=%d\n", info));
5696
5697         *result = fsp;
5698         if (pinfo != NULL) {
5699                 *pinfo = info;
5700         }
5701         return NT_STATUS_OK;
5702
5703  fail:
5704         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5705
5706         if (fsp != NULL) {
5707                 close_file(req, fsp, ERROR_CLOSE);
5708                 fsp = NULL;
5709         }
5710         return status;
5711 }