source3/smbd/open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    file opening and share modes
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2004
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Ralph Boehme 2017
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/filesys.h"
  25 #include "lib/util/server_id.h"
  26 #include "printing.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "fake_file.h"
  30 #include "../libcli/security/security.h"
  31 #include "../librpc/gen_ndr/ndr_security.h"
  32 #include "../librpc/gen_ndr/open_files.h"
  33 #include "../librpc/gen_ndr/idmap.h"
  34 #include "../librpc/gen_ndr/ioctl.h"
  35 #include "passdb/lookup_sid.h"
  36 #include "auth.h"
  37 #include "serverid.h"
  38 #include "messages.h"
  39 #include "source3/lib/dbwrap/dbwrap_watch.h"
  40 #include "locking/leases_db.h"
  41 #include "librpc/gen_ndr/ndr_leases_db.h"
  42
  43 extern const struct generic_mapping file_generic_mapping;
  44
  45 struct deferred_open_record {
  46         bool delayed_for_oplocks;
  47         bool async_open;
  48         struct file_id id;
  49
  50         /*
  51          * Timer for async opens, needed because they don't use a watch on
  52          * a locking.tdb record. This is currently only used for real async
  53          * opens and just terminates smbd if the async open times out.
  54          */
  55         struct tevent_timer *te;
  56 };
  57
  58 /****************************************************************************
  59  If the requester wanted DELETE_ACCESS and was rejected because
  60  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  61  overrides this.
  62 ****************************************************************************/
  63
  64 static bool parent_override_delete(connection_struct *conn,
  65                                         const struct smb_filename *smb_fname,
  66                                         uint32_t access_mask,
  67                                         uint32_t rejected_mask)
  68 {
  69         if ((access_mask & DELETE_ACCESS) &&
  70                     (rejected_mask & DELETE_ACCESS) &&
  71                     can_delete_file_in_directory(conn, smb_fname)) {
  72                 return true;
  73         }
  74         return false;
  75 }
  76
  77 /****************************************************************************
  78  Check if we have open rights.
  79 ****************************************************************************/
  80
  81 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  82                                 const struct smb_filename *smb_fname,
  83                                 bool use_privs,
  84                                 uint32_t access_mask)
  85 {
  86         /* Check if we have rights to open. */
  87         NTSTATUS status;
  88         struct security_descriptor *sd = NULL;
  89         uint32_t rejected_share_access;
  90         uint32_t rejected_mask = access_mask;
  91         uint32_t do_not_check_mask = 0;
  92
  93         rejected_share_access = access_mask & ~(conn->share_access);
  94
  95         if (rejected_share_access) {
  96                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  97                         "on %s (0x%x)\n",
  98                         (unsigned int)access_mask,
  99                         smb_fname_str_dbg(smb_fname),
 100                         (unsigned int)rejected_share_access ));
 101                 return NT_STATUS_ACCESS_DENIED;
 102         }
 103
 104         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
 105                 /* I'm sorry sir, I didn't know you were root... */
 106                 DEBUG(10,("smbd_check_access_rights: root override "
 107                         "on %s. Granting 0x%x\n",
 108                         smb_fname_str_dbg(smb_fname),
 109                         (unsigned int)access_mask ));
 110                 return NT_STATUS_OK;
 111         }
 112
 113         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 114                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 115                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 116                         smb_fname_str_dbg(smb_fname),
 117                         (unsigned int)access_mask ));
 118                 return NT_STATUS_OK;
 119         }
 120
 121         if (access_mask == DELETE_ACCESS &&
 122                         VALID_STAT(smb_fname->st) &&
 123                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 124                 /* We can always delete a symlink. */
 125                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 126                         "on DELETE_ACCESS on symlink %s.\n",
 127                         smb_fname_str_dbg(smb_fname) ));
 128                 return NT_STATUS_OK;
 129         }
 130
 131         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
 132                         (SECINFO_OWNER |
 133                         SECINFO_GROUP |
 134                          SECINFO_DACL), talloc_tos(), &sd);
 135
 136         if (!NT_STATUS_IS_OK(status)) {
 137                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 138                         "on %s: %s\n",
 139                         smb_fname_str_dbg(smb_fname),
 140                         nt_errstr(status)));
 141
 142                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 143                         goto access_denied;
 144                 }
 145
 146                 return status;
 147         }
 148
 149         /*
 150          * If we can access the path to this file, by
 151          * default we have FILE_READ_ATTRIBUTES from the
 152          * containing directory. See the section:
 153          * "Algorithm to Check Access to an Existing File"
 154          * in MS-FSA.pdf.
 155          *
 156          * se_file_access_check() also takes care of
 157          * owner WRITE_DAC and READ_CONTROL.
 158          */
 159         do_not_check_mask = FILE_READ_ATTRIBUTES;
 160
 161         /*
 162          * Samba 3.6 and earlier granted execute access even
 163          * if the ACL did not contain execute rights.
 164          * Samba 4.0 is more correct and checks it.
 165          * The compatibilty mode allows one to skip this check
 166          * to smoothen upgrades.
 167          */
 168         if (lp_acl_allow_execute_always(SNUM(conn))) {
 169                 do_not_check_mask |= FILE_EXECUTE;
 170         }
 171
 172         status = se_file_access_check(sd,
 173                                 get_current_nttok(conn),
 174                                 use_privs,
 175                                 (access_mask & ~do_not_check_mask),
 176                                 &rejected_mask);
 177
 178         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 179                 "0x%x returning 0x%x (%s)\n",
 180                 smb_fname_str_dbg(smb_fname),
 181                 (unsigned int)access_mask,
 182                 (unsigned int)rejected_mask,
 183                 nt_errstr(status) ));
 184
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 if (DEBUGLEVEL >= 10) {
 187                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 188                                 smb_fname_str_dbg(smb_fname) ));
 189                         NDR_PRINT_DEBUG(security_descriptor, sd);
 190                 }
 191         }
 192
 193         TALLOC_FREE(sd);
 194
 195         if (NT_STATUS_IS_OK(status) ||
 196                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 197                 return status;
 198         }
 199
 200         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 201
 202   access_denied:
 203
 204         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 205                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 206                         !lp_store_dos_attributes(SNUM(conn)) &&
 207                         (lp_map_readonly(SNUM(conn)) ||
 208                         lp_map_archive(SNUM(conn)) ||
 209                         lp_map_hidden(SNUM(conn)) ||
 210                         lp_map_system(SNUM(conn)))) {
 211                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 212
 213                 DEBUG(10,("smbd_check_access_rights: "
 214                         "overrode "
 215                         "FILE_WRITE_ATTRIBUTES "
 216                         "on file %s\n",
 217                         smb_fname_str_dbg(smb_fname)));
 218         }
 219
 220         if (parent_override_delete(conn,
 221                                 smb_fname,
 222                                 access_mask,
 223                                 rejected_mask)) {
 224                 /* Were we trying to do an open
 225                  * for delete and didn't get DELETE
 226                  * access (only) ? Check if the
 227                  * directory allows DELETE_CHILD.
 228                  * See here:
 229                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 230                  * for details. */
 231
 232                 rejected_mask &= ~DELETE_ACCESS;
 233
 234                 DEBUG(10,("smbd_check_access_rights: "
 235                         "overrode "
 236                         "DELETE_ACCESS on "
 237                         "file %s\n",
 238                         smb_fname_str_dbg(smb_fname)));
 239         }
 240
 241         if (rejected_mask != 0) {
 242                 return NT_STATUS_ACCESS_DENIED;
 243         }
 244         return NT_STATUS_OK;
 245 }
 246
 247 NTSTATUS check_parent_access(struct connection_struct *conn,
 248                                 struct smb_filename *smb_fname,
 249                                 uint32_t access_mask)
 250 {
 251         NTSTATUS status;
 252         char *parent_dir = NULL;
 253         struct security_descriptor *parent_sd = NULL;
 254         uint32_t access_granted = 0;
 255         struct smb_filename *parent_smb_fname = NULL;
 256         struct share_mode_lock *lck = NULL;
 257         struct file_id id = {0};
 258         uint32_t name_hash;
 259         bool delete_on_close_set;
 260         int ret;
 261         TALLOC_CTX *frame = talloc_stackframe();
 262
 263         if (!parent_dirname(frame,
 264                                 smb_fname->base_name,
 265                                 &parent_dir,
 266                                 NULL)) {
 267                 status = NT_STATUS_NO_MEMORY;
 268                 goto out;
 269         }
 270
 271         parent_smb_fname = synthetic_smb_fname(frame,
 272                                 parent_dir,
 273                                 NULL,
 274                                 NULL,
 275                                 smb_fname->flags);
 276         if (parent_smb_fname == NULL) {
 277                 status = NT_STATUS_NO_MEMORY;
 278                 goto out;
 279         }
 280
 281         if (get_current_uid(conn) == (uid_t)0) {
 282                 /* I'm sorry sir, I didn't know you were root... */
 283                 DEBUG(10,("check_parent_access: root override "
 284                         "on %s. Granting 0x%x\n",
 285                         smb_fname_str_dbg(smb_fname),
 286                         (unsigned int)access_mask ));
 287                 status = NT_STATUS_OK;
 288                 goto out;
 289         }
 290
 291         status = SMB_VFS_GET_NT_ACL(conn,
 292                                 parent_smb_fname,
 293                                 SECINFO_DACL,
 294                                 frame,
 295                                 &parent_sd);
 296
 297         if (!NT_STATUS_IS_OK(status)) {
 298                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 299                         "%s with error %s\n",
 300                         parent_dir,
 301                         nt_errstr(status)));
 302                 goto out;
 303         }
 304
 305         /*
 306          * If we can access the path to this file, by
 307          * default we have FILE_READ_ATTRIBUTES from the
 308          * containing directory. See the section:
 309          * "Algorithm to Check Access to an Existing File"
 310          * in MS-FSA.pdf.
 311          *
 312          * se_file_access_check() also takes care of
 313          * owner WRITE_DAC and READ_CONTROL.
 314          */
 315         status = se_file_access_check(parent_sd,
 316                                 get_current_nttok(conn),
 317                                 false,
 318                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 319                                 &access_granted);
 320         if(!NT_STATUS_IS_OK(status)) {
 321                 DEBUG(5,("check_parent_access: access check "
 322                         "on directory %s for "
 323                         "path %s for mask 0x%x returned (0x%x) %s\n",
 324                         parent_dir,
 325                         smb_fname->base_name,
 326                         access_mask,
 327                         access_granted,
 328                         nt_errstr(status) ));
 329                 goto out;
 330         }
 331
 332         if (!(access_mask & (SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR))) {
 333                 status = NT_STATUS_OK;
 334                 goto out;
 335         }
 336         if (!lp_check_parent_directory_delete_on_close(SNUM(conn))) {
 337                 status = NT_STATUS_OK;
 338                 goto out;
 339         }
 340
 341         /* Check if the directory has delete-on-close set */
 342         ret = SMB_VFS_STAT(conn, parent_smb_fname);
 343         if (ret != 0) {
 344                 status = map_nt_error_from_unix(errno);
 345                 goto out;
 346         }
 347
 348         id = SMB_VFS_FILE_ID_CREATE(conn, &parent_smb_fname->st);
 349
 350         status = file_name_hash(conn, parent_smb_fname->base_name, &name_hash);
 351         if (!NT_STATUS_IS_OK(status)) {
 352                 goto out;
 353         }
 354
 355         lck = get_existing_share_mode_lock(frame, id);
 356         if (lck == NULL) {
 357                 status = NT_STATUS_OK;
 358                 goto out;
 359         }
 360
 361         delete_on_close_set = is_delete_on_close_set(lck, name_hash);
 362         if (delete_on_close_set) {
 363                 status = NT_STATUS_DELETE_PENDING;
 364                 goto out;
 365         }
 366
 367         status = NT_STATUS_OK;
 368
 369 out:
 370         TALLOC_FREE(frame);
 371         return status;
 372 }
 373
 374 /****************************************************************************
 375  Ensure when opening a base file for a stream open that we have permissions
 376  to do so given the access mask on the base file.
 377 ****************************************************************************/
 378
 379 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 380                                 struct smb_filename *smb_fname,
 381                                 uint32_t access_mask)
 382 {
 383         NTSTATUS status;
 384
 385         status = smbd_calculate_access_mask(conn, smb_fname,
 386                                         false,
 387                                         access_mask,
 388                                         &access_mask);
 389         if (!NT_STATUS_IS_OK(status)) {
 390                 DEBUG(10, ("smbd_calculate_access_mask "
 391                         "on file %s returned %s\n",
 392                         smb_fname_str_dbg(smb_fname),
 393                         nt_errstr(status)));
 394                 return status;
 395         }
 396
 397         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 398                 uint32_t dosattrs;
 399                 if (!CAN_WRITE(conn)) {
 400                         return NT_STATUS_ACCESS_DENIED;
 401                 }
 402                 dosattrs = dos_mode(conn, smb_fname);
 403                 if (IS_DOS_READONLY(dosattrs)) {
 404                         return NT_STATUS_ACCESS_DENIED;
 405                 }
 406         }
 407
 408         return smbd_check_access_rights(conn,
 409                                         smb_fname,
 410                                         false,
 411                                         access_mask);
 412 }
 413
 414 /****************************************************************************
 415  Handle differing symlink errno's
 416 ****************************************************************************/
 417
 418 static int link_errno_convert(int err)
 419 {
 420 #if defined(ENOTSUP) && defined(OSF1)
 421         /* handle special Tru64 errno */
 422         if (err == ENOTSUP) {
 423                 err = ELOOP;
 424         }
 425 #endif /* ENOTSUP */
 426 #ifdef EFTYPE
 427         /* fix broken NetBSD errno */
 428         if (err == EFTYPE) {
 429                 err = ELOOP;
 430         }
 431 #endif /* EFTYPE */
 432         /* fix broken FreeBSD errno */
 433         if (err == EMLINK) {
 434                 err = ELOOP;
 435         }
 436         return err;
 437 }
 438
 439 static int non_widelink_open(struct connection_struct *conn,
 440                         const struct smb_filename *conn_rootdir_fname,
 441                         files_struct *fsp,
 442                         struct smb_filename *smb_fname,
 443                         int flags,
 444                         mode_t mode,
 445                         unsigned int link_depth);
 446
 447 /****************************************************************************
 448  Follow a symlink in userspace.
 449 ****************************************************************************/
 450
 451 static int process_symlink_open(struct connection_struct *conn,
 452                         const struct smb_filename *conn_rootdir_fname,
 453                         files_struct *fsp,
 454                         struct smb_filename *smb_fname,
 455                         int flags,
 456                         mode_t mode,
 457                         unsigned int link_depth)
 458 {
 459         int fd = -1;
 460         char *link_target = NULL;
 461         struct smb_filename target_fname = {0};
 462         int link_len = -1;
 463         struct smb_filename *oldwd_fname = NULL;
 464         size_t rootdir_len = 0;
 465         struct smb_filename *resolved_fname = NULL;
 466         char *resolved_name = NULL;
 467         bool matched = false;
 468         int saved_errno = 0;
 469
 470         /*
 471          * Ensure we don't get stuck in a symlink loop.
 472          */
 473         link_depth++;
 474         if (link_depth >= 20) {
 475                 errno = ELOOP;
 476                 goto out;
 477         }
 478
 479         /* Allocate space for the link target. */
 480         link_target = talloc_array(talloc_tos(), char, PATH_MAX);
 481         if (link_target == NULL) {
 482                 errno = ENOMEM;
 483                 goto out;
 484         }
 485
 486         /* Read the link target. */
 487         link_len = SMB_VFS_READLINK(conn,
 488                                 smb_fname,
 489                                 link_target,
 490                                 PATH_MAX - 1);
 491         if (link_len == -1) {
 492                 goto out;
 493         }
 494
 495         /* Ensure it's at least null terminated. */
 496         link_target[link_len] = '\0';
 497         target_fname = (struct smb_filename){ .base_name = link_target };
 498
 499         /* Convert to an absolute path. */
 500         resolved_fname = SMB_VFS_REALPATH(conn, talloc_tos(), &target_fname);
 501         if (resolved_fname == NULL) {
 502                 goto out;
 503         }
 504         resolved_name = resolved_fname->base_name;
 505
 506         /*
 507          * We know conn_rootdir starts with '/' and
 508          * does not end in '/'. FIXME ! Should we
 509          * smb_assert this ?
 510          */
 511         rootdir_len = strlen(conn_rootdir_fname->base_name);
 512
 513         matched = (strncmp(conn_rootdir_fname->base_name,
 514                                 resolved_name,
 515                                 rootdir_len) == 0);
 516         if (!matched) {
 517                 errno = EACCES;
 518                 goto out;
 519         }
 520
 521         /*
 522          * Turn into a path relative to the share root.
 523          */
 524         if (resolved_name[rootdir_len] == '\0') {
 525                 /* Link to the root of the share. */
 526                 TALLOC_FREE(smb_fname->base_name);
 527                 smb_fname->base_name = talloc_strdup(smb_fname, ".");
 528         } else if (resolved_name[rootdir_len] == '/') {
 529                 TALLOC_FREE(smb_fname->base_name);
 530                 smb_fname->base_name = talloc_strdup(smb_fname,
 531                                         &resolved_name[rootdir_len+1]);
 532         } else {
 533                 errno = EACCES;
 534                 goto out;
 535         }
 536
 537         if (smb_fname->base_name == NULL) {
 538                 errno = ENOMEM;
 539                 goto out;
 540         }
 541
 542         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 543         if (oldwd_fname == NULL) {
 544                 goto out;
 545         }
 546
 547         /* Ensure we operate from the root of the share. */
 548         if (vfs_ChDir(conn, conn_rootdir_fname) == -1) {
 549                 goto out;
 550         }
 551
 552         /* And do it all again.. */
 553         fd = non_widelink_open(conn,
 554                                 conn_rootdir_fname,
 555                                 fsp,
 556                                 smb_fname,
 557                                 flags,
 558                                 mode,
 559                                 link_depth);
 560         if (fd == -1) {
 561                 saved_errno = errno;
 562         }
 563
 564   out:
 565
 566         TALLOC_FREE(resolved_fname);
 567         TALLOC_FREE(link_target);
 568         if (oldwd_fname != NULL) {
 569                 int ret = vfs_ChDir(conn, oldwd_fname);
 570                 if (ret == -1) {
 571                         smb_panic("unable to get back to old directory\n");
 572                 }
 573                 TALLOC_FREE(oldwd_fname);
 574         }
 575         if (saved_errno != 0) {
 576                 errno = saved_errno;
 577         }
 578         return fd;
 579 }
 580
 581 /****************************************************************************
 582  Non-widelink open.
 583 ****************************************************************************/
 584
 585 static int non_widelink_open(struct connection_struct *conn,
 586                         const struct smb_filename *conn_rootdir_fname,
 587                         files_struct *fsp,
 588                         struct smb_filename *smb_fname,
 589                         int flags,
 590                         mode_t mode,
 591                         unsigned int link_depth)
 592 {
 593         NTSTATUS status;
 594         int fd = -1;
 595         struct smb_filename *smb_fname_rel = NULL;
 596         int saved_errno = 0;
 597         struct smb_filename *oldwd_fname = NULL;
 598         char *parent_dir = NULL;
 599         struct smb_filename parent_dir_fname = {0};
 600         const char *final_component = NULL;
 601         bool is_directory = false;
 602         bool ok;
 603
 604 #ifdef O_DIRECTORY
 605         if (flags & O_DIRECTORY) {
 606                 is_directory = true;
 607         }
 608 #endif
 609
 610         if (is_directory) {
 611                 parent_dir = talloc_strdup(talloc_tos(), smb_fname->base_name);
 612                 if (parent_dir == NULL) {
 613                         saved_errno = errno;
 614                         goto out;
 615                 }
 616
 617                 final_component = ".";
 618         } else {
 619                 ok = parent_dirname(talloc_tos(),
 620                                     smb_fname->base_name,
 621                                     &parent_dir,
 622                                     &final_component);
 623                 if (!ok) {
 624                         saved_errno = errno;
 625                         goto out;
 626                 }
 627         }
 628
 629         parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
 630
 631         oldwd_fname = vfs_GetWd(talloc_tos(), conn);
 632         if (oldwd_fname == NULL) {
 633                 goto out;
 634         }
 635
 636         /* Pin parent directory in place. */
 637         if (vfs_ChDir(conn, &parent_dir_fname) == -1) {
 638                 goto out;
 639         }
 640
 641         smb_fname_rel = synthetic_smb_fname(talloc_tos(),
 642                                 final_component,
 643                                 smb_fname->stream_name,
 644                                 &smb_fname->st,
 645                                 smb_fname->flags);
 646         if (smb_fname_rel == NULL) {
 647                 saved_errno = ENOMEM;
 648                 goto out;
 649         }
 650
 651         /* Ensure the relative path is below the share. */
 652         status = check_reduced_name(conn, &parent_dir_fname, smb_fname_rel);
 653         if (!NT_STATUS_IS_OK(status)) {
 654                 saved_errno = map_errno_from_nt_status(status);
 655                 goto out;
 656         }
 657
 658         flags |= O_NOFOLLOW;
 659
 660         {
 661                 struct smb_filename *tmp_name = fsp->fsp_name;
 662                 fsp->fsp_name = smb_fname_rel;
 663                 fd = SMB_VFS_OPEN(conn, smb_fname_rel, fsp, flags, mode);
 664                 fsp->fsp_name = tmp_name;
 665         }
 666
 667         if (fd == -1) {
 668                 saved_errno = link_errno_convert(errno);
 669                 /*
 670                  * Trying to open a symlink to a directory with O_NOFOLLOW and
 671                  * O_DIRECTORY can return either of ELOOP and ENOTDIR. So
 672                  * ENOTDIR really means: might be a symlink, but we're not sure.
 673                  * In this case, we just assume there's a symlink. If we were
 674                  * wrong, process_symlink_open() will return EINVAL. We check
 675                  * this below, and fall back to returning the initial
 676                  * saved_errno.
 677                  *
 678                  * BUG: https://bugzilla.samba.org/show_bug.cgi?id=12860
 679                  */
 680                 if (saved_errno == ELOOP || saved_errno == ENOTDIR) {
 681                         if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
 682                                 /* Never follow symlinks on posix open. */
 683                                 goto out;
 684                         }
 685                         if (!lp_follow_symlinks(SNUM(conn))) {
 686                                 /* Explicitly no symlinks. */
 687                                 goto out;
 688                         }
 689                         /*
 690                          * We may have a symlink. Follow in userspace
 691                          * to ensure it's under the share definition.
 692                          */
 693                         fd = process_symlink_open(conn,
 694                                         conn_rootdir_fname,
 695                                         fsp,
 696                                         smb_fname_rel,
 697                                         flags,
 698                                         mode,
 699                                         link_depth);
 700                         if (fd == -1) {
 701                                 if (saved_errno == ENOTDIR &&
 702                                                 errno == EINVAL) {
 703                                         /*
 704                                          * O_DIRECTORY on neither a directory,
 705                                          * nor a symlink. Just return
 706                                          * saved_errno from initial open()
 707                                          */
 708                                         goto out;
 709                                 }
 710                                 saved_errno =
 711                                         link_errno_convert(errno);
 712                         }
 713                 }
 714         }
 715
 716   out:
 717
 718         TALLOC_FREE(parent_dir);
 719         TALLOC_FREE(smb_fname_rel);
 720
 721         if (oldwd_fname != NULL) {
 722                 int ret = vfs_ChDir(conn, oldwd_fname);
 723                 if (ret == -1) {
 724                         smb_panic("unable to get back to old directory\n");
 725                 }
 726                 TALLOC_FREE(oldwd_fname);
 727         }
 728         if (saved_errno != 0) {
 729                 errno = saved_errno;
 730         }
 731         return fd;
 732 }
 733
 734 /****************************************************************************
 735  fd support routines - attempt to do a dos_open.
 736 ****************************************************************************/
 737
 738 NTSTATUS fd_open(struct connection_struct *conn,
 739                  files_struct *fsp,
 740                  int flags,
 741                  mode_t mode)
 742 {
 743         struct smb_filename *smb_fname = fsp->fsp_name;
 744         NTSTATUS status = NT_STATUS_OK;
 745
 746         /*
 747          * Never follow symlinks on a POSIX client. The
 748          * client should be doing this.
 749          */
 750
 751         if ((fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) || !lp_follow_symlinks(SNUM(conn))) {
 752                 flags |= O_NOFOLLOW;
 753         }
 754
 755         /* Ensure path is below share definition. */
 756         if (!lp_widelinks(SNUM(conn))) {
 757                 struct smb_filename *conn_rootdir_fname = NULL;
 758                 const char *conn_rootdir = SMB_VFS_CONNECTPATH(conn,
 759                                                 smb_fname);
 760                 int saved_errno = 0;
 761
 762                 if (conn_rootdir == NULL) {
 763                         return NT_STATUS_NO_MEMORY;
 764                 }
 765                 conn_rootdir_fname = synthetic_smb_fname(talloc_tos(),
 766                                                 conn_rootdir,
 767                                                 NULL,
 768                                                 NULL,
 769                                                 0);
 770                 if (conn_rootdir_fname == NULL) {
 771                         return NT_STATUS_NO_MEMORY;
 772                 }
 773
 774                 /*
 775                  * Only follow symlinks within a share
 776                  * definition.
 777                  */
 778                 fsp->fh->fd = non_widelink_open(conn,
 779                                         conn_rootdir_fname,
 780                                         fsp,
 781                                         smb_fname,
 782                                         flags,
 783                                         mode,
 784                                         0);
 785                 if (fsp->fh->fd == -1) {
 786                         saved_errno = errno;
 787                 }
 788                 TALLOC_FREE(conn_rootdir_fname);
 789                 if (saved_errno != 0) {
 790                         errno = saved_errno;
 791                 }
 792         } else {
 793                 fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 794         }
 795
 796         if (fsp->fh->fd == -1) {
 797                 int posix_errno = link_errno_convert(errno);
 798                 status = map_nt_error_from_unix(posix_errno);
 799                 if (errno == EMFILE) {
 800                         static time_t last_warned = 0L;
 801
 802                         if (time((time_t *) NULL) > last_warned) {
 803                                 DEBUG(0,("Too many open files, unable "
 804                                         "to open more!  smbd's max "
 805                                         "open files = %d\n",
 806                                         lp_max_open_files()));
 807                                 last_warned = time((time_t *) NULL);
 808                         }
 809                 }
 810
 811         }
 812
 813         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 814                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 815                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 816
 817         return status;
 818 }
 819
 820 /****************************************************************************
 821  Close the file associated with a fsp.
 822 ****************************************************************************/
 823
 824 NTSTATUS fd_close(files_struct *fsp)
 825 {
 826         int ret;
 827
 828         if (fsp->dptr) {
 829                 dptr_CloseDir(fsp);
 830         }
 831         if (fsp->fh->fd == -1) {
 832                 return NT_STATUS_OK; /* What we used to call a stat open. */
 833         }
 834         if (fsp->fh->ref_count > 1) {
 835                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 836         }
 837
 838         ret = SMB_VFS_CLOSE(fsp);
 839         fsp->fh->fd = -1;
 840         if (ret == -1) {
 841                 return map_nt_error_from_unix(errno);
 842         }
 843         return NT_STATUS_OK;
 844 }
 845
 846 /****************************************************************************
 847  Change the ownership of a file to that of the parent directory.
 848  Do this by fd if possible.
 849 ****************************************************************************/
 850
 851 void change_file_owner_to_parent(connection_struct *conn,
 852                                         const char *inherit_from_dir,
 853                                         files_struct *fsp)
 854 {
 855         struct smb_filename *smb_fname_parent;
 856         int ret;
 857
 858         smb_fname_parent = synthetic_smb_fname(talloc_tos(),
 859                                         inherit_from_dir,
 860                                         NULL,
 861                                         NULL,
 862                                         0);
 863         if (smb_fname_parent == NULL) {
 864                 return;
 865         }
 866
 867         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 868         if (ret == -1) {
 869                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 870                          "directory %s. Error was %s\n",
 871                          smb_fname_str_dbg(smb_fname_parent),
 872                          strerror(errno)));
 873                 TALLOC_FREE(smb_fname_parent);
 874                 return;
 875         }
 876
 877         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 878                 /* Already this uid - no need to change. */
 879                 DEBUG(10,("change_file_owner_to_parent: file %s "
 880                         "is already owned by uid %d\n",
 881                         fsp_str_dbg(fsp),
 882                         (int)fsp->fsp_name->st.st_ex_uid ));
 883                 TALLOC_FREE(smb_fname_parent);
 884                 return;
 885         }
 886
 887         become_root();
 888         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 889         unbecome_root();
 890         if (ret == -1) {
 891                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 892                          "file %s to parent directory uid %u. Error "
 893                          "was %s\n", fsp_str_dbg(fsp),
 894                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 895                          strerror(errno) ));
 896         } else {
 897                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 898                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 899                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 900                 /* Ensure the uid entry is updated. */
 901                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 902         }
 903
 904         TALLOC_FREE(smb_fname_parent);
 905 }
 906
 907 static NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 908                                         const char *inherit_from_dir,
 909                                         struct smb_filename *smb_dname,
 910                                         SMB_STRUCT_STAT *psbuf)
 911 {
 912         struct smb_filename *smb_fname_parent;
 913         struct smb_filename *smb_fname_cwd = NULL;
 914         struct smb_filename *saved_dir_fname = NULL;
 915         TALLOC_CTX *ctx = talloc_tos();
 916         NTSTATUS status = NT_STATUS_OK;
 917         int ret;
 918
 919         smb_fname_parent = synthetic_smb_fname(ctx,
 920                                         inherit_from_dir,
 921                                         NULL,
 922                                         NULL,
 923                                         0);
 924         if (smb_fname_parent == NULL) {
 925                 return NT_STATUS_NO_MEMORY;
 926         }
 927
 928         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 929         if (ret == -1) {
 930                 status = map_nt_error_from_unix(errno);
 931                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 932                          "directory %s. Error was %s\n",
 933                          smb_fname_str_dbg(smb_fname_parent),
 934                          strerror(errno)));
 935                 goto out;
 936         }
 937
 938         /* We've already done an lstat into psbuf, and we know it's a
 939            directory. If we can cd into the directory and the dev/ino
 940            are the same then we can safely chown without races as
 941            we're locking the directory in place by being in it.  This
 942            should work on any UNIX (thanks tridge :-). JRA.
 943         */
 944
 945         saved_dir_fname = vfs_GetWd(ctx,conn);
 946         if (!saved_dir_fname) {
 947                 status = map_nt_error_from_unix(errno);
 948                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 949                          "current working directory. Error was %s\n",
 950                          strerror(errno)));
 951                 goto out;
 952         }
 953
 954         /* Chdir into the new path. */
 955         if (vfs_ChDir(conn, smb_dname) == -1) {
 956                 status = map_nt_error_from_unix(errno);
 957                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 958                          "current working directory to %s. Error "
 959                          "was %s\n", smb_dname->base_name, strerror(errno) ));
 960                 goto chdir;
 961         }
 962
 963         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL, 0);
 964         if (smb_fname_cwd == NULL) {
 965                 status = NT_STATUS_NO_MEMORY;
 966                 goto chdir;
 967         }
 968
 969         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 970         if (ret == -1) {
 971                 status = map_nt_error_from_unix(errno);
 972                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 973                          "directory '.' (%s) Error was %s\n",
 974                          smb_dname->base_name, strerror(errno)));
 975                 goto chdir;
 976         }
 977
 978         /* Ensure we're pointing at the same place. */
 979         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 980             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 981                 DEBUG(0,("change_dir_owner_to_parent: "
 982                          "device/inode on directory %s changed. "
 983                          "Refusing to chown !\n",
 984                         smb_dname->base_name ));
 985                 status = NT_STATUS_ACCESS_DENIED;
 986                 goto chdir;
 987         }
 988
 989         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 990                 /* Already this uid - no need to change. */
 991                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 992                         "is already owned by uid %d\n",
 993                         smb_dname->base_name,
 994                         (int)smb_fname_cwd->st.st_ex_uid ));
 995                 status = NT_STATUS_OK;
 996                 goto chdir;
 997         }
 998
 999         become_root();
1000         ret = SMB_VFS_LCHOWN(conn,
1001                         smb_fname_cwd,
1002                         smb_fname_parent->st.st_ex_uid,
1003                         (gid_t)-1);
1004         unbecome_root();
1005         if (ret == -1) {
1006                 status = map_nt_error_from_unix(errno);
1007                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
1008                           "directory %s to parent directory uid %u. "
1009                           "Error was %s\n",
1010                           smb_dname->base_name,
1011                           (unsigned int)smb_fname_parent->st.st_ex_uid,
1012                           strerror(errno) ));
1013         } else {
1014                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
1015                         "directory %s to parent directory uid %u.\n",
1016                         smb_dname->base_name,
1017                         (unsigned int)smb_fname_parent->st.st_ex_uid ));
1018                 /* Ensure the uid entry is updated. */
1019                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
1020         }
1021
1022  chdir:
1023         vfs_ChDir(conn, saved_dir_fname);
1024  out:
1025         TALLOC_FREE(saved_dir_fname);
1026         TALLOC_FREE(smb_fname_parent);
1027         TALLOC_FREE(smb_fname_cwd);
1028         return status;
1029 }
1030
1031 /****************************************************************************
1032  Open a file - returning a guaranteed ATOMIC indication of if the
1033  file was created or not.
1034 ****************************************************************************/
1035
1036 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
1037                         files_struct *fsp,
1038                         int flags,
1039                         mode_t mode,
1040                         bool *file_created)
1041 {
1042         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
1043         NTSTATUS retry_status;
1044         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1045         int curr_flags;
1046
1047         *file_created = false;
1048
1049         if (!(flags & O_CREAT)) {
1050                 /*
1051                  * We're not creating the file, just pass through.
1052                  */
1053                 return fd_open(conn, fsp, flags, mode);
1054         }
1055
1056         if (flags & O_EXCL) {
1057                 /*
1058                  * Fail if already exists, just pass through.
1059                  */
1060                 status = fd_open(conn, fsp, flags, mode);
1061
1062                 /*
1063                  * Here we've opened with O_CREAT|O_EXCL. If that went
1064                  * NT_STATUS_OK, we *know* we created this file.
1065                  */
1066                 *file_created = NT_STATUS_IS_OK(status);
1067
1068                 return status;
1069         }
1070
1071         /*
1072          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
1073          * To know absolutely if we created the file or not,
1074          * we can never call O_CREAT without O_EXCL. So if
1075          * we think the file existed, try without O_CREAT|O_EXCL.
1076          * If we think the file didn't exist, try with
1077          * O_CREAT|O_EXCL.
1078          *
1079          * The big problem here is dangling symlinks. Opening
1080          * without O_NOFOLLOW means both bad symlink
1081          * and missing path return -1, ENOENT from open(). As POSIX
1082          * is pathname based it's not possible to tell
1083          * the difference between these two cases in a
1084          * non-racy way, so change to try only two attempts before
1085          * giving up.
1086          *
1087          * We don't have this problem for the O_NOFOLLOW
1088          * case as it just returns NT_STATUS_OBJECT_PATH_NOT_FOUND
1089          * mapped from the ELOOP POSIX error.
1090          */
1091
1092         curr_flags = flags;
1093
1094         if (file_existed) {
1095                 curr_flags &= ~(O_CREAT);
1096                 retry_status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
1097         } else {
1098                 curr_flags |= O_EXCL;
1099                 retry_status = NT_STATUS_OBJECT_NAME_COLLISION;
1100         }
1101
1102         status = fd_open(conn, fsp, curr_flags, mode);
1103         if (NT_STATUS_IS_OK(status)) {
1104                 if (!file_existed) {
1105                         *file_created = true;
1106                 }
1107                 return NT_STATUS_OK;
1108         }
1109         if (!NT_STATUS_EQUAL(status, retry_status)) {
1110                 return status;
1111         }
1112
1113         curr_flags = flags;
1114
1115         /*
1116          * Keep file_existed up to date for clarity.
1117          */
1118         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1119                 file_existed = false;
1120                 curr_flags |= O_EXCL;
1121                 DBG_DEBUG("file %s did not exist. Retry.\n",
1122                         smb_fname_str_dbg(fsp->fsp_name));
1123         } else {
1124                 file_existed = true;
1125                 curr_flags &= ~(O_CREAT);
1126                 DBG_DEBUG("file %s existed. Retry.\n",
1127                         smb_fname_str_dbg(fsp->fsp_name));
1128         }
1129
1130         status = fd_open(conn, fsp, curr_flags, mode);
1131
1132         if (NT_STATUS_IS_OK(status) && (!file_existed)) {
1133                 *file_created = true;
1134         }
1135
1136         return status;
1137 }
1138
1139 /****************************************************************************
1140  Open a file.
1141 ****************************************************************************/
1142
1143 static NTSTATUS open_file(files_struct *fsp,
1144                           connection_struct *conn,
1145                           struct smb_request *req,
1146                           const char *parent_dir,
1147                           int flags,
1148                           mode_t unx_mode,
1149                           uint32_t access_mask, /* client requested access mask. */
1150                           uint32_t open_access_mask, /* what we're actually using in the open. */
1151                           bool *p_file_created)
1152 {
1153         struct smb_filename *smb_fname = fsp->fsp_name;
1154         NTSTATUS status = NT_STATUS_OK;
1155         int accmode = (flags & O_ACCMODE);
1156         int local_flags = flags;
1157         bool file_existed = VALID_STAT(fsp->fsp_name->st);
1158
1159         fsp->fh->fd = -1;
1160         errno = EPERM;
1161
1162         /* Check permissions */
1163
1164         /*
1165          * This code was changed after seeing a client open request
1166          * containing the open mode of (DENY_WRITE/read-only) with
1167          * the 'create if not exist' bit set. The previous code
1168          * would fail to open the file read only on a read-only share
1169          * as it was checking the flags parameter  directly against O_RDONLY,
1170          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
1171          * JRA.
1172          */
1173
1174         if (!CAN_WRITE(conn)) {
1175                 /* It's a read-only share - fail if we wanted to write. */
1176                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
1177                         DEBUG(3,("Permission denied opening %s\n",
1178                                  smb_fname_str_dbg(smb_fname)));
1179                         return NT_STATUS_ACCESS_DENIED;
1180                 }
1181                 if (flags & O_CREAT) {
1182                         /* We don't want to write - but we must make sure that
1183                            O_CREAT doesn't create the file if we have write
1184                            access into the directory.
1185                         */
1186                         flags &= ~(O_CREAT|O_EXCL);
1187                         local_flags &= ~(O_CREAT|O_EXCL);
1188                 }
1189         }
1190
1191         /*
1192          * This little piece of insanity is inspired by the
1193          * fact that an NT client can open a file for O_RDONLY,
1194          * but set the create disposition to FILE_EXISTS_TRUNCATE.
1195          * If the client *can* write to the file, then it expects to
1196          * truncate the file, even though it is opening for readonly.
1197          * Quicken uses this stupid trick in backup file creation...
1198          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
1199          * for helping track this one down. It didn't bite us in 2.0.x
1200          * as we always opened files read-write in that release. JRA.
1201          */
1202
1203         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
1204                 DEBUG(10,("open_file: truncate requested on read-only open "
1205                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
1206                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
1207         }
1208
1209         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
1210             (!file_existed && (local_flags & O_CREAT)) ||
1211             ((local_flags & O_TRUNC) == O_TRUNC) ) {
1212                 const char *wild;
1213                 int ret;
1214
1215 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
1216                 /*
1217                  * We would block on opening a FIFO with no one else on the
1218                  * other end. Do what we used to do and add O_NONBLOCK to the
1219                  * open flags. JRA.
1220                  */
1221
1222                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
1223                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
1224                         local_flags |= O_NONBLOCK;
1225                 }
1226 #endif
1227
1228                 /* Don't create files with Microsoft wildcard characters. */
1229                 if (fsp->base_fsp) {
1230                         /*
1231                          * wildcard characters are allowed in stream names
1232                          * only test the basefilename
1233                          */
1234                         wild = fsp->base_fsp->fsp_name->base_name;
1235                 } else {
1236                         wild = smb_fname->base_name;
1237                 }
1238                 if ((local_flags & O_CREAT) && !file_existed &&
1239                     !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
1240                     ms_has_wild(wild))  {
1241                         return NT_STATUS_OBJECT_NAME_INVALID;
1242                 }
1243
1244                 /* Can we access this file ? */
1245                 if (!fsp->base_fsp) {
1246                         /* Only do this check on non-stream open. */
1247                         if (file_existed) {
1248                                 status = smbd_check_access_rights(conn,
1249                                                 smb_fname,
1250                                                 false,
1251                                                 access_mask);
1252
1253                                 if (!NT_STATUS_IS_OK(status)) {
1254                                         DEBUG(10, ("open_file: "
1255                                                    "smbd_check_access_rights "
1256                                                    "on file %s returned %s\n",
1257                                                    smb_fname_str_dbg(smb_fname),
1258                                                    nt_errstr(status)));
1259                                 }
1260
1261                                 if (!NT_STATUS_IS_OK(status) &&
1262                                     !NT_STATUS_EQUAL(status,
1263                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1264                                 {
1265                                         return status;
1266                                 }
1267
1268                                 if (NT_STATUS_EQUAL(status,
1269                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
1270                                 {
1271                                         DEBUG(10, ("open_file: "
1272                                                 "file %s vanished since we "
1273                                                 "checked for existence.\n",
1274                                                 smb_fname_str_dbg(smb_fname)));
1275                                         file_existed = false;
1276                                         SET_STAT_INVALID(fsp->fsp_name->st);
1277                                 }
1278                         }
1279
1280                         if (!file_existed) {
1281                                 if (!(local_flags & O_CREAT)) {
1282                                         /* File didn't exist and no O_CREAT. */
1283                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1284                                 }
1285
1286                                 status = check_parent_access(conn,
1287                                                              smb_fname,
1288                                                              SEC_DIR_ADD_FILE);
1289                                 if (!NT_STATUS_IS_OK(status)) {
1290                                         DEBUG(10, ("open_file: "
1291                                                    "check_parent_access on "
1292                                                    "file %s returned %s\n",
1293                                                    smb_fname_str_dbg(smb_fname),
1294                                                    nt_errstr(status) ));
1295                                         return status;
1296                                 }
1297                         }
1298                 }
1299
1300                 /*
1301                  * Actually do the open - if O_TRUNC is needed handle it
1302                  * below under the share mode lock.
1303                  */
1304                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
1305                                 unx_mode, p_file_created);
1306                 if (!NT_STATUS_IS_OK(status)) {
1307                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
1308                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
1309                                  nt_errstr(status),local_flags,flags));
1310                         return status;
1311                 }
1312
1313                 if (local_flags & O_NONBLOCK) {
1314                         /*
1315                          * GPFS can return ETIMEDOUT for pread on
1316                          * nonblocking file descriptors when files
1317                          * migrated to tape need to be recalled. I
1318                          * could imagine this happens elsehwere
1319                          * too. With blocking file descriptors this
1320                          * does not happen.
1321                          */
1322                         ret = set_blocking(fsp->fh->fd, true);
1323                         if (ret == -1) {
1324                                 status = map_nt_error_from_unix(errno);
1325                                 DBG_WARNING("Could not set fd to blocking: "
1326                                             "%s\n", strerror(errno));
1327                                 fd_close(fsp);
1328                                 return status;
1329                         }
1330                 }
1331
1332                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1333                 if (ret == -1) {
1334                         /* If we have an fd, this stat should succeed. */
1335                         DEBUG(0,("Error doing fstat on open file %s "
1336                                 "(%s)\n",
1337                                 smb_fname_str_dbg(smb_fname),
1338                                 strerror(errno) ));
1339                         status = map_nt_error_from_unix(errno);
1340                         fd_close(fsp);
1341                         return status;
1342                 }
1343
1344                 if (*p_file_created) {
1345                         /* We created this file. */
1346
1347                         bool need_re_stat = false;
1348                         /* Do all inheritance work after we've
1349                            done a successful fstat call and filled
1350                            in the stat struct in fsp->fsp_name. */
1351
1352                         /* Inherit the ACL if required */
1353                         if (lp_inherit_permissions(SNUM(conn))) {
1354                                 inherit_access_posix_acl(conn, parent_dir,
1355                                                          smb_fname,
1356                                                          unx_mode);
1357                                 need_re_stat = true;
1358                         }
1359
1360                         /* Change the owner if required. */
1361                         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
1362                                 change_file_owner_to_parent(conn, parent_dir,
1363                                                             fsp);
1364                                 need_re_stat = true;
1365                         }
1366
1367                         if (need_re_stat) {
1368                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
1369                                 /* If we have an fd, this stat should succeed. */
1370                                 if (ret == -1) {
1371                                         DEBUG(0,("Error doing fstat on open file %s "
1372                                                  "(%s)\n",
1373                                                  smb_fname_str_dbg(smb_fname),
1374                                                  strerror(errno) ));
1375                                 }
1376                         }
1377
1378                         notify_fname(conn, NOTIFY_ACTION_ADDED,
1379                                      FILE_NOTIFY_CHANGE_FILE_NAME,
1380                                      smb_fname->base_name);
1381                 }
1382         } else {
1383                 fsp->fh->fd = -1; /* What we used to call a stat open. */
1384                 if (!file_existed) {
1385                         /* File must exist for a stat open. */
1386                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1387                 }
1388
1389                 status = smbd_check_access_rights(conn,
1390                                 smb_fname,
1391                                 false,
1392                                 access_mask);
1393
1394                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
1395                                 (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) &&
1396                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
1397                         /* This is a POSIX stat open for delete
1398                          * or rename on a symlink that points
1399                          * nowhere. Allow. */
1400                         DEBUG(10,("open_file: allowing POSIX "
1401                                   "open on bad symlink %s\n",
1402                                   smb_fname_str_dbg(smb_fname)));
1403                         status = NT_STATUS_OK;
1404                 }
1405
1406                 if (!NT_STATUS_IS_OK(status)) {
1407                         DEBUG(10,("open_file: "
1408                                 "smbd_check_access_rights on file "
1409                                 "%s returned %s\n",
1410                                 smb_fname_str_dbg(smb_fname),
1411                                 nt_errstr(status) ));
1412                         return status;
1413                 }
1414         }
1415
1416         /*
1417          * POSIX allows read-only opens of directories. We don't
1418          * want to do this (we use a different code path for this)
1419          * so catch a directory open and return an EISDIR. JRA.
1420          */
1421
1422         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1423                 fd_close(fsp);
1424                 errno = EISDIR;
1425                 return NT_STATUS_FILE_IS_A_DIRECTORY;
1426         }
1427
1428         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
1429         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
1430         fsp->file_pid = req ? req->smbpid : 0;
1431         fsp->can_lock = True;
1432         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
1433         fsp->can_write =
1434                 CAN_WRITE(conn) &&
1435                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
1436         fsp->print_file = NULL;
1437         fsp->modified = False;
1438         fsp->sent_oplock_break = NO_BREAK_SENT;
1439         fsp->is_directory = False;
1440         if (conn->aio_write_behind_list &&
1441             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
1442                        conn->case_sensitive)) {
1443                 fsp->aio_write_behind = True;
1444         }
1445
1446         fsp->wcp = NULL; /* Write cache pointer. */
1447
1448         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1449                  conn->session_info->unix_info->unix_name,
1450                  smb_fname_str_dbg(smb_fname),
1451                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1452                  conn->num_files_open));
1453
1454         errno = 0;
1455         return NT_STATUS_OK;
1456 }
1457
1458 /****************************************************************************
1459  Check if we can open a file with a share mode.
1460  Returns True if conflict, False if not.
1461 ****************************************************************************/
1462
1463 static bool share_conflict(struct share_mode_entry *entry,
1464                            uint32_t access_mask,
1465                            uint32_t share_access)
1466 {
1467         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1468                   "entry->share_access = 0x%x, "
1469                   "entry->private_options = 0x%x\n",
1470                   (unsigned int)entry->access_mask,
1471                   (unsigned int)entry->share_access,
1472                   (unsigned int)entry->private_options));
1473
1474         if (server_id_is_disconnected(&entry->pid)) {
1475                 /*
1476                  * note: cleanup should have been done by
1477                  * delay_for_batch_oplocks()
1478                  */
1479                 return false;
1480         }
1481
1482         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1483                   (unsigned int)access_mask, (unsigned int)share_access));
1484
1485         if ((entry->access_mask & (FILE_WRITE_DATA|
1486                                    FILE_APPEND_DATA|
1487                                    FILE_READ_DATA|
1488                                    FILE_EXECUTE|
1489                                    DELETE_ACCESS)) == 0) {
1490                 DEBUG(10,("share_conflict: No conflict due to "
1491                           "entry->access_mask = 0x%x\n",
1492                           (unsigned int)entry->access_mask ));
1493                 return False;
1494         }
1495
1496         if ((access_mask & (FILE_WRITE_DATA|
1497                             FILE_APPEND_DATA|
1498                             FILE_READ_DATA|
1499                             FILE_EXECUTE|
1500                             DELETE_ACCESS)) == 0) {
1501                 DEBUG(10,("share_conflict: No conflict due to "
1502                           "access_mask = 0x%x\n",
1503                           (unsigned int)access_mask ));
1504                 return False;
1505         }
1506
1507 #if 1 /* JRA TEST - Superdebug. */
1508 #define CHECK_MASK(num, am, right, sa, share) \
1509         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1510                 (unsigned int)(num), (unsigned int)(am), \
1511                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1512         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1513                 (unsigned int)(num), (unsigned int)(sa), \
1514                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1515         if (((am) & (right)) && !((sa) & (share))) { \
1516                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1517 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1518                         (unsigned int)(share) )); \
1519                 return True; \
1520         }
1521 #else
1522 #define CHECK_MASK(num, am, right, sa, share) \
1523         if (((am) & (right)) && !((sa) & (share))) { \
1524                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1525 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1526                         (unsigned int)(share) )); \
1527                 return True; \
1528         }
1529 #endif
1530
1531         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1532                    share_access, FILE_SHARE_WRITE);
1533         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1534                    entry->share_access, FILE_SHARE_WRITE);
1535
1536         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1537                    share_access, FILE_SHARE_READ);
1538         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1539                    entry->share_access, FILE_SHARE_READ);
1540
1541         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1542                    share_access, FILE_SHARE_DELETE);
1543         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1544                    entry->share_access, FILE_SHARE_DELETE);
1545
1546         DEBUG(10,("share_conflict: No conflict.\n"));
1547         return False;
1548 }
1549
1550 #if defined(DEVELOPER)
1551 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1552                                       const struct file_id id,
1553                                       int num,
1554                                       struct share_mode_entry *share_entry)
1555 {
1556         struct server_id self = messaging_server_id(sconn->msg_ctx);
1557         files_struct *fsp;
1558
1559         if (!serverid_equal(&self, &share_entry->pid)) {
1560                 return;
1561         }
1562
1563         if (share_entry->op_mid == 0) {
1564                 /* INTERNAL_OPEN_ONLY */
1565                 return;
1566         }
1567
1568         if (!is_valid_share_mode_entry(share_entry)) {
1569                 return;
1570         }
1571
1572         fsp = file_find_dif(sconn, id, share_entry->share_file_id);
1573         if (!fsp) {
1574                 DBG_ERR("PANIC : %s\n",
1575                         share_mode_str(talloc_tos(), num, &id,
1576                                        share_entry));
1577                 smb_panic("validate_my_share_entries: Cannot match a "
1578                           "share entry with an open file\n");
1579         }
1580
1581         if (((uint16_t)fsp->oplock_type) != share_entry->op_type) {
1582                 goto panic;
1583         }
1584
1585         return;
1586
1587  panic:
1588         {
1589                 char *str;
1590                 DBG_ERR("validate_my_share_entries: PANIC : %s\n",
1591                         share_mode_str(talloc_tos(), num, &id,
1592                                        share_entry));
1593                 str = talloc_asprintf(talloc_tos(),
1594                         "validate_my_share_entries: "
1595                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1596                          fsp->fsp_name->base_name,
1597                          (unsigned int)fsp->oplock_type,
1598                          (unsigned int)share_entry->op_type );
1599                 smb_panic(str);
1600         }
1601 }
1602 #endif
1603
1604 bool is_stat_open(uint32_t access_mask)
1605 {
1606         const uint32_t stat_open_bits =
1607                 (SYNCHRONIZE_ACCESS|
1608                  FILE_READ_ATTRIBUTES|
1609                  FILE_WRITE_ATTRIBUTES);
1610
1611         return (((access_mask &  stat_open_bits) != 0) &&
1612                 ((access_mask & ~stat_open_bits) == 0));
1613 }
1614
1615 static bool has_delete_on_close(struct share_mode_lock *lck,
1616                                 uint32_t name_hash)
1617 {
1618         struct share_mode_data *d = lck->data;
1619         uint32_t i;
1620
1621         if (d->num_share_modes == 0) {
1622                 return false;
1623         }
1624         if (!is_delete_on_close_set(lck, name_hash)) {
1625                 return false;
1626         }
1627         for (i=0; i<d->num_share_modes; i++) {
1628                 if (!share_mode_stale_pid(d, i)) {
1629                         return true;
1630                 }
1631         }
1632         return false;
1633 }
1634
1635 /****************************************************************************
1636  Deal with share modes
1637  Invariant: Share mode must be locked on entry and exit.
1638  Returns -1 on error, or number of share modes on success (may be zero).
1639 ****************************************************************************/
1640
1641 static NTSTATUS open_mode_check(connection_struct *conn,
1642                                 struct share_mode_lock *lck,
1643                                 uint32_t access_mask,
1644                                 uint32_t share_access)
1645 {
1646         uint32_t i;
1647
1648         if(lck->data->num_share_modes == 0) {
1649                 return NT_STATUS_OK;
1650         }
1651
1652         if (is_stat_open(access_mask)) {
1653                 /* Stat open that doesn't trigger oplock breaks or share mode
1654                  * checks... ! JRA. */
1655                 return NT_STATUS_OK;
1656         }
1657
1658         /*
1659          * Check if the share modes will give us access.
1660          */
1661
1662 #if defined(DEVELOPER)
1663         for(i = 0; i < lck->data->num_share_modes; i++) {
1664                 validate_my_share_entries(conn->sconn, lck->data->id, i,
1665                                           &lck->data->share_modes[i]);
1666         }
1667 #endif
1668
1669         /* Now we check the share modes, after any oplock breaks. */
1670         for(i = 0; i < lck->data->num_share_modes; i++) {
1671
1672                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1673                         continue;
1674                 }
1675
1676                 /* someone else has a share lock on it, check to see if we can
1677                  * too */
1678                 if (share_conflict(&lck->data->share_modes[i],
1679                                    access_mask, share_access)) {
1680
1681                         if (share_mode_stale_pid(lck->data, i)) {
1682                                 continue;
1683                         }
1684
1685                         return NT_STATUS_SHARING_VIOLATION;
1686                 }
1687         }
1688
1689         return NT_STATUS_OK;
1690 }
1691
1692 /*
1693  * Send a break message to the oplock holder and delay the open for
1694  * our client.
1695  */
1696
1697 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1698                             const struct file_id *id,
1699                             const struct share_mode_entry *exclusive,
1700                             uint16_t break_to)
1701 {
1702         NTSTATUS status;
1703         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1704         struct server_id_buf tmp;
1705
1706         DEBUG(10, ("Sending break request to PID %s\n",
1707                    server_id_str_buf(exclusive->pid, &tmp)));
1708
1709         /* Create the message. */
1710         share_mode_entry_to_message(msg, id, exclusive);
1711
1712         /* Overload entry->op_type */
1713         /*
1714          * This is a cut from uint32_t to uint16_t, but so far only the lower 3
1715          * bits (LEASE_WRITE/HANDLE/READ are used anyway.
1716          */
1717         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1718
1719         status = messaging_send_buf(msg_ctx, exclusive->pid,
1720                                     MSG_SMB_BREAK_REQUEST,
1721                                     (uint8_t *)msg, sizeof(msg));
1722         if (!NT_STATUS_IS_OK(status)) {
1723                 DEBUG(3, ("Could not send oplock break message: %s\n",
1724                           nt_errstr(status)));
1725         }
1726
1727         return status;
1728 }
1729
1730 /*
1731  * Do internal consistency checks on the share mode for a file.
1732  */
1733
1734 static bool validate_oplock_types(struct share_mode_lock *lck)
1735 {
1736         struct share_mode_data *d = lck->data;
1737         bool batch = false;
1738         bool ex_or_batch = false;
1739         bool level2 = false;
1740         bool no_oplock = false;
1741         uint32_t num_non_stat_opens = 0;
1742         uint32_t i;
1743
1744         for (i=0; i<d->num_share_modes; i++) {
1745                 struct share_mode_entry *e = &d->share_modes[i];
1746
1747                 if (!is_valid_share_mode_entry(e)) {
1748                         continue;
1749                 }
1750
1751                 if (e->op_mid == 0) {
1752                         /* INTERNAL_OPEN_ONLY */
1753                         continue;
1754                 }
1755
1756                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1757                         /* We ignore stat opens in the table - they
1758                            always have NO_OPLOCK and never get or
1759                            cause breaks. JRA. */
1760                         continue;
1761                 }
1762
1763                 num_non_stat_opens += 1;
1764
1765                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1766                         /* batch - can only be one. */
1767                         if (share_mode_stale_pid(d, i)) {
1768                                 DEBUG(10, ("Found stale batch oplock\n"));
1769                                 continue;
1770                         }
1771                         if (ex_or_batch || batch || level2 || no_oplock) {
1772                                 DEBUG(0, ("Bad batch oplock entry %u.",
1773                                           (unsigned)i));
1774                                 return false;
1775                         }
1776                         batch = true;
1777                 }
1778
1779                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1780                         if (share_mode_stale_pid(d, i)) {
1781                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1782                                 continue;
1783                         }
1784                         /* Exclusive or batch - can only be one. */
1785                         if (ex_or_batch || level2 || no_oplock) {
1786                                 DEBUG(0, ("Bad exclusive or batch oplock "
1787                                           "entry %u.", (unsigned)i));
1788                                 return false;
1789                         }
1790                         ex_or_batch = true;
1791                 }
1792
1793                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1794                         if (batch || ex_or_batch) {
1795                                 if (share_mode_stale_pid(d, i)) {
1796                                         DEBUG(10, ("Found stale LevelII "
1797                                                    "oplock\n"));
1798                                         continue;
1799                                 }
1800                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1801                                           (unsigned)i));
1802                                 return false;
1803                         }
1804                         level2 = true;
1805                 }
1806
1807                 if (e->op_type == NO_OPLOCK) {
1808                         if (batch || ex_or_batch) {
1809                                 if (share_mode_stale_pid(d, i)) {
1810                                         DEBUG(10, ("Found stale NO_OPLOCK "
1811                                                    "entry\n"));
1812                                         continue;
1813                                 }
1814                                 DEBUG(0, ("Bad no oplock entry %u.",
1815                                           (unsigned)i));
1816                                 return false;
1817                         }
1818                         no_oplock = true;
1819                 }
1820         }
1821
1822         remove_stale_share_mode_entries(d);
1823
1824         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1825                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1826                           (int)batch, (int)ex_or_batch,
1827                           (int)d->num_share_modes));
1828                 return false;
1829         }
1830
1831         return true;
1832 }
1833
1834 static bool delay_for_oplock(files_struct *fsp,
1835                              int oplock_request,
1836                              const struct smb2_lease *lease,
1837                              struct share_mode_lock *lck,
1838                              bool have_sharing_violation,
1839                              uint32_t create_disposition,
1840                              bool first_open_attempt)
1841 {
1842         struct share_mode_data *d = lck->data;
1843         uint32_t i;
1844         bool delay = false;
1845         bool will_overwrite;
1846
1847         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1848             is_stat_open(fsp->access_mask)) {
1849                 return false;
1850         }
1851
1852         switch (create_disposition) {
1853         case FILE_SUPERSEDE:
1854         case FILE_OVERWRITE:
1855         case FILE_OVERWRITE_IF:
1856                 will_overwrite = true;
1857                 break;
1858         default:
1859                 will_overwrite = false;
1860                 break;
1861         }
1862
1863         for (i=0; i<d->num_share_modes; i++) {
1864                 struct share_mode_entry *e = &d->share_modes[i];
1865                 bool e_is_lease = (e->op_type == LEASE_OPLOCK);
1866                 struct share_mode_lease *l = NULL;
1867                 uint32_t e_lease_type = get_lease_type(d, e);
1868                 uint32_t break_to;
1869                 uint32_t delay_mask = 0;
1870                 bool lease_is_breaking = false;
1871
1872                 if (e_is_lease) {
1873                         l = &d->leases[e->lease_idx];
1874                         lease_is_breaking = l->breaking;
1875                 }
1876
1877                 if (have_sharing_violation) {
1878                         delay_mask = SMB2_LEASE_HANDLE;
1879                 } else {
1880                         delay_mask = SMB2_LEASE_WRITE;
1881                 }
1882
1883                 break_to = e_lease_type & ~delay_mask;
1884
1885                 if (will_overwrite) {
1886                         /*
1887                          * we'll decide about SMB2_LEASE_READ later.
1888                          *
1889                          * Maybe the break will be deferred
1890                          */
1891                         break_to &= ~SMB2_LEASE_HANDLE;
1892                 }
1893
1894                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1895                            (unsigned)i, (unsigned)e_lease_type,
1896                            (unsigned)will_overwrite));
1897
1898                 if (e_is_lease && lease != NULL) {
1899                         bool ign;
1900
1901                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1902                                                &lease->lease_key,
1903                                                &l->client_guid,
1904                                                &l->lease_key);
1905                         if (ign) {
1906                                 continue;
1907                         }
1908                 }
1909
1910                 if ((e_lease_type & ~break_to) == 0) {
1911                         if (lease_is_breaking) {
1912                                 delay = true;
1913                         }
1914                         continue;
1915                 }
1916
1917                 if (share_mode_stale_pid(d, i)) {
1918                         continue;
1919                 }
1920
1921                 if (will_overwrite) {
1922                         /*
1923                          * If we break anyway break to NONE directly.
1924                          * Otherwise vfs_set_filelen() will trigger the
1925                          * break.
1926                          */
1927                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1928                 }
1929
1930                 if (!e_is_lease) {
1931                         /*
1932                          * Oplocks only support breaking to R or NONE.
1933                          */
1934                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1935                 }
1936
1937                 DEBUG(10, ("breaking from %d to %d\n",
1938                            (int)e_lease_type, (int)break_to));
1939                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1940                                    e, break_to);
1941                 if (e_lease_type & delay_mask) {
1942                         delay = true;
1943                 }
1944                 if (lease_is_breaking && !first_open_attempt) {
1945                         delay = true;
1946                 }
1947                 continue;
1948         }
1949
1950         return delay;
1951 }
1952
1953 static bool file_has_brlocks(files_struct *fsp)
1954 {
1955         struct byte_range_lock *br_lck;
1956
1957         br_lck = brl_get_locks_readonly(fsp);
1958         if (!br_lck)
1959                 return false;
1960
1961         return (brl_num_locks(br_lck) > 0);
1962 }
1963
1964 int find_share_mode_lease(struct share_mode_data *d,
1965                           const struct GUID *client_guid,
1966                           const struct smb2_lease_key *key)
1967 {
1968         uint32_t i;
1969
1970         for (i=0; i<d->num_leases; i++) {
1971                 struct share_mode_lease *l = &d->leases[i];
1972
1973                 if (smb2_lease_equal(client_guid,
1974                                      key,
1975                                      &l->client_guid,
1976                                      &l->lease_key)) {
1977                         return i;
1978                 }
1979         }
1980
1981         return -1;
1982 }
1983
1984 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1985                                  const struct smb2_lease_key *key,
1986                                  uint32_t current_state,
1987                                  uint16_t lease_version,
1988                                  uint16_t lease_epoch)
1989 {
1990         struct files_struct *fsp;
1991
1992         /*
1993          * TODO: Measure how expensive this loop is with thousands of open
1994          * handles...
1995          */
1996
1997         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1998              fsp != NULL;
1999              fsp = file_find_di_next(fsp)) {
2000
2001                 if (fsp == new_fsp) {
2002                         continue;
2003                 }
2004                 if (fsp->oplock_type != LEASE_OPLOCK) {
2005                         continue;
2006                 }
2007                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
2008                         fsp->lease->ref_count += 1;
2009                         return fsp->lease;
2010                 }
2011         }
2012
2013         /* Not found - must be leased in another smbd. */
2014         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2015         if (new_fsp->lease == NULL) {
2016                 return NULL;
2017         }
2018         new_fsp->lease->ref_count = 1;
2019         new_fsp->lease->sconn = new_fsp->conn->sconn;
2020         new_fsp->lease->lease.lease_key = *key;
2021         new_fsp->lease->lease.lease_state = current_state;
2022         /*
2023          * We internally treat all leases as V2 and update
2024          * the epoch, but when sending breaks it matters if
2025          * the requesting lease was v1 or v2.
2026          */
2027         new_fsp->lease->lease.lease_version = lease_version;
2028         new_fsp->lease->lease.lease_epoch = lease_epoch;
2029         return new_fsp->lease;
2030 }
2031
2032 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2033                                 struct share_mode_lock *lck,
2034                                 const struct smb2_lease *lease,
2035                                 uint32_t *p_lease_idx,
2036                                 uint32_t granted)
2037 {
2038         struct share_mode_data *d = lck->data;
2039         const struct GUID *client_guid = fsp_client_guid(fsp);
2040         struct share_mode_lease *tmp;
2041         NTSTATUS status;
2042         int idx;
2043
2044         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2045
2046         if (idx != -1) {
2047                 struct share_mode_lease *l = &d->leases[idx];
2048                 bool do_upgrade;
2049                 uint32_t existing, requested;
2050
2051                 fsp->lease = find_fsp_lease(
2052                         fsp,
2053                         &lease->lease_key,
2054                         l->current_state,
2055                         l->lease_version,
2056                         l->epoch);
2057                 if (fsp->lease == NULL) {
2058                         DEBUG(1, ("Did not find existing lease for file %s\n",
2059                                   fsp_str_dbg(fsp)));
2060                         return NT_STATUS_NO_MEMORY;
2061                 }
2062
2063                 *p_lease_idx = idx;
2064
2065                 /*
2066                  * Upgrade only if the requested lease is a strict upgrade.
2067                  */
2068                 existing = l->current_state;
2069                 requested = lease->lease_state;
2070
2071                 /*
2072                  * Tricky: This test makes sure that "requested" is a
2073                  * strict bitwise superset of "existing".
2074                  */
2075                 do_upgrade = ((existing & requested) == existing);
2076
2077                 /*
2078                  * Upgrade only if there's a change.
2079                  */
2080                 do_upgrade &= (granted != existing);
2081
2082                 /*
2083                  * Upgrade only if other leases don't prevent what was asked
2084                  * for.
2085                  */
2086                 do_upgrade &= (granted == requested);
2087
2088                 /*
2089                  * only upgrade if we are not in breaking state
2090                  */
2091                 do_upgrade &= !l->breaking;
2092
2093                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2094                            "granted=%"PRIu32", do_upgrade=%d\n",
2095                            existing, requested, granted, (int)do_upgrade));
2096
2097                 if (do_upgrade) {
2098                         l->current_state = granted;
2099                         l->epoch += 1;
2100                 }
2101
2102                 {
2103                         NTSTATUS set_status;
2104
2105                         set_status = leases_db_set(
2106                                 client_guid,
2107                                 &lease->lease_key,
2108                                 l->current_state,
2109                                 l->breaking,
2110                                 l->breaking_to_requested,
2111                                 l->breaking_to_required,
2112                                 l->lease_version,
2113                                 l->epoch);
2114
2115                         if (!NT_STATUS_IS_OK(set_status)) {
2116                                 DBG_DEBUG("leases_db_set failed: %s\n",
2117                                           nt_errstr(set_status));
2118                                 return set_status;
2119                         }
2120                 }
2121
2122                 /* Ensure we're in sync with current lease state. */
2123                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2124                 return NT_STATUS_OK;
2125         }
2126
2127         /*
2128          * Create new lease
2129          */
2130
2131         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2132                              d->num_leases+1);
2133         if (tmp == NULL) {
2134                 /*
2135                  * See [MS-SMB2]
2136                  */
2137                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2138         }
2139         d->leases = tmp;
2140
2141         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2142         if (fsp->lease == NULL) {
2143                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2144         }
2145         fsp->lease->ref_count = 1;
2146         fsp->lease->sconn = fsp->conn->sconn;
2147         fsp->lease->lease.lease_version = lease->lease_version;
2148         fsp->lease->lease.lease_key = lease->lease_key;
2149         fsp->lease->lease.lease_state = granted;
2150         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2151
2152         *p_lease_idx = d->num_leases;
2153
2154         d->leases[d->num_leases] = (struct share_mode_lease) {
2155                 .client_guid = *client_guid,
2156                 .lease_key = fsp->lease->lease.lease_key,
2157                 .current_state = fsp->lease->lease.lease_state,
2158                 .lease_version = fsp->lease->lease.lease_version,
2159                 .epoch = fsp->lease->lease.lease_epoch,
2160         };
2161
2162         status = leases_db_add(client_guid,
2163                                &lease->lease_key,
2164                                &fsp->file_id,
2165                                fsp->lease->lease.lease_state,
2166                                fsp->lease->lease.lease_version,
2167                                fsp->lease->lease.lease_epoch,
2168                                fsp->conn->connectpath,
2169                                fsp->fsp_name->base_name,
2170                                fsp->fsp_name->stream_name);
2171         if (!NT_STATUS_IS_OK(status)) {
2172                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2173                            nt_errstr(status)));
2174                 TALLOC_FREE(fsp->lease);
2175                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2176         }
2177
2178         d->num_leases += 1;
2179         d->modified = true;
2180
2181         return NT_STATUS_OK;
2182 }
2183
2184 static bool is_same_lease(const files_struct *fsp,
2185                           const struct share_mode_data *d,
2186                           const struct share_mode_entry *e,
2187                           const struct smb2_lease *lease)
2188 {
2189         if (e->op_type != LEASE_OPLOCK) {
2190                 return false;
2191         }
2192         if (lease == NULL) {
2193                 return false;
2194         }
2195
2196         return smb2_lease_equal(fsp_client_guid(fsp),
2197                                 &lease->lease_key,
2198                                 &d->leases[e->lease_idx].client_guid,
2199                                 &d->leases[e->lease_idx].lease_key);
2200 }
2201
2202 static int map_lease_type_to_oplock(uint32_t lease_type)
2203 {
2204         int result = NO_OPLOCK;
2205
2206         switch (lease_type) {
2207         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2208                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2209                 break;
2210         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2211                 result = EXCLUSIVE_OPLOCK;
2212                 break;
2213         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2214         case SMB2_LEASE_READ:
2215                 result = LEVEL_II_OPLOCK;
2216                 break;
2217         }
2218
2219         return result;
2220 }
2221
2222 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2223                                       struct files_struct *fsp,
2224                                       struct share_mode_lock *lck,
2225                                       int oplock_request,
2226                                       struct smb2_lease *lease)
2227 {
2228         struct share_mode_data *d = lck->data;
2229         bool got_handle_lease = false;
2230         bool got_oplock = false;
2231         uint32_t i;
2232         uint32_t granted;
2233         uint32_t lease_idx = UINT32_MAX;
2234         bool ok;
2235         NTSTATUS status;
2236
2237         if (oplock_request & INTERNAL_OPEN_ONLY) {
2238                 /* No oplocks on internal open. */
2239                 oplock_request = NO_OPLOCK;
2240                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2241                         fsp->oplock_type, fsp_str_dbg(fsp)));
2242         }
2243
2244         if (oplock_request == LEASE_OPLOCK) {
2245                 if (lease == NULL) {
2246                         /*
2247                          * The SMB2 layer should have checked this
2248                          */
2249                         return NT_STATUS_INTERNAL_ERROR;
2250                 }
2251
2252                 granted = lease->lease_state;
2253
2254                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2255                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2256                         granted = SMB2_LEASE_NONE;
2257                 }
2258                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2259                         DEBUG(10, ("No read or write lease requested\n"));
2260                         granted = SMB2_LEASE_NONE;
2261                 }
2262                 if (granted == SMB2_LEASE_WRITE) {
2263                         DEBUG(10, ("pure write lease requested\n"));
2264                         granted = SMB2_LEASE_NONE;
2265                 }
2266                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2267                         DEBUG(10, ("write and handle lease requested\n"));
2268                         granted = SMB2_LEASE_NONE;
2269                 }
2270         } else {
2271                 granted = map_oplock_to_lease_type(
2272                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2273         }
2274
2275         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2276                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2277                         fsp_str_dbg(fsp)));
2278                 granted &= ~SMB2_LEASE_READ;
2279         }
2280
2281         for (i=0; i<d->num_share_modes; i++) {
2282                 struct share_mode_entry *e = &d->share_modes[i];
2283                 uint32_t e_lease_type;
2284
2285                 e_lease_type = get_lease_type(d, e);
2286
2287                 if ((granted & SMB2_LEASE_WRITE) &&
2288                     !is_same_lease(fsp, d, e, lease) &&
2289                     !share_mode_stale_pid(d, i)) {
2290                         /*
2291                          * Can grant only one writer
2292                          */
2293                         granted &= ~SMB2_LEASE_WRITE;
2294                 }
2295
2296                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2297                     !share_mode_stale_pid(d, i)) {
2298                         got_handle_lease = true;
2299                 }
2300
2301                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2302                     !share_mode_stale_pid(d, i)) {
2303                         got_oplock = true;
2304                 }
2305         }
2306
2307         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2308                 bool allow_level2 =
2309                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2310                         lp_level2_oplocks(SNUM(fsp->conn));
2311
2312                 if (!allow_level2) {
2313                         granted = SMB2_LEASE_NONE;
2314                 }
2315         }
2316
2317         if (oplock_request == LEASE_OPLOCK) {
2318                 if (got_oplock) {
2319                         granted &= ~SMB2_LEASE_HANDLE;
2320                 }
2321
2322                 fsp->oplock_type = LEASE_OPLOCK;
2323
2324                 status = grant_fsp_lease(fsp, lck, lease, &lease_idx,
2325                                          granted);
2326                 if (!NT_STATUS_IS_OK(status)) {
2327                         return status;
2328
2329                 }
2330                 *lease = fsp->lease->lease;
2331                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2332         } else {
2333                 if (got_handle_lease) {
2334                         granted = SMB2_LEASE_NONE;
2335                 }
2336
2337                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2338
2339                 status = set_file_oplock(fsp);
2340                 if (!NT_STATUS_IS_OK(status)) {
2341                         /*
2342                          * Could not get the kernel oplock
2343                          */
2344                         fsp->oplock_type = NO_OPLOCK;
2345                 }
2346         }
2347
2348         ok = set_share_mode(lck, fsp, get_current_uid(fsp->conn),
2349                             req ? req->mid : 0,
2350                             fsp->oplock_type,
2351                             lease_idx);
2352         if (!ok) {
2353                 return NT_STATUS_NO_MEMORY;
2354         }
2355
2356         ok = update_num_read_oplocks(fsp, lck);
2357         if (!ok) {
2358                 del_share_mode(lck, fsp);
2359                 return NT_STATUS_INTERNAL_ERROR;
2360         }
2361
2362         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2363                   fsp->oplock_type, fsp_str_dbg(fsp)));
2364
2365         return NT_STATUS_OK;
2366 }
2367
2368 static bool request_timed_out(struct timeval request_time,
2369                               struct timeval timeout)
2370 {
2371         struct timeval now, end_time;
2372         GetTimeOfDay(&now);
2373         end_time = timeval_sum(&request_time, &timeout);
2374         return (timeval_compare(&end_time, &now) < 0);
2375 }
2376
2377 static struct deferred_open_record *deferred_open_record_create(
2378         bool delayed_for_oplocks,
2379         bool async_open,
2380         struct file_id id)
2381 {
2382         struct deferred_open_record *record = NULL;
2383
2384         record = talloc(NULL, struct deferred_open_record);
2385         if (record == NULL) {
2386                 return NULL;
2387         }
2388
2389         *record = (struct deferred_open_record) {
2390                 .delayed_for_oplocks = delayed_for_oplocks,
2391                 .async_open = async_open,
2392                 .id = id,
2393         };
2394
2395         return record;
2396 }
2397
2398 struct defer_open_state {
2399         struct smbXsrv_connection *xconn;
2400         uint64_t mid;
2401 };
2402
2403 static void defer_open_done(struct tevent_req *req);
2404
2405 /**
2406  * Defer an open and watch a locking.tdb record
2407  *
2408  * This defers an open that gets rescheduled once the locking.tdb record watch
2409  * is triggered by a change to the record.
2410  *
2411  * It is used to defer opens that triggered an oplock break and for the SMB1
2412  * sharing violation delay.
2413  **/
2414 static void defer_open(struct share_mode_lock *lck,
2415                        struct timeval request_time,
2416                        struct timeval timeout,
2417                        struct smb_request *req,
2418                        bool delayed_for_oplocks,
2419                        struct file_id id)
2420 {
2421         struct deferred_open_record *open_rec = NULL;
2422         struct timeval abs_timeout;
2423         struct defer_open_state *watch_state;
2424         struct tevent_req *watch_req;
2425         bool ok;
2426
2427         abs_timeout = timeval_sum(&request_time, &timeout);
2428
2429         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2430                   "delayed_for_oplocks [%s] file_id [%s]\n",
2431                   timeval_string(talloc_tos(), &request_time, false),
2432                   timeval_string(talloc_tos(), &abs_timeout, false),
2433                   req->mid,
2434                   delayed_for_oplocks ? "yes" : "no",
2435                   file_id_string_tos(&id));
2436
2437         open_rec = deferred_open_record_create(delayed_for_oplocks,
2438                                                false,
2439                                                id);
2440         if (open_rec == NULL) {
2441                 TALLOC_FREE(lck);
2442                 exit_server("talloc failed");
2443         }
2444
2445         watch_state = talloc(open_rec, struct defer_open_state);
2446         if (watch_state == NULL) {
2447                 exit_server("talloc failed");
2448         }
2449         watch_state->xconn = req->xconn;
2450         watch_state->mid = req->mid;
2451
2452         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2453
2454         watch_req = dbwrap_watched_watch_send(watch_state,
2455                                               req->sconn->ev_ctx,
2456                                               lck->data->record,
2457                                               (struct server_id){0});
2458         if (watch_req == NULL) {
2459                 exit_server("Could not watch share mode record");
2460         }
2461         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2462
2463         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2464         if (!ok) {
2465                 exit_server("tevent_req_set_endtime failed");
2466         }
2467
2468         ok = push_deferred_open_message_smb(req, request_time, timeout,
2469                                             open_rec->id, open_rec);
2470         if (!ok) {
2471                 TALLOC_FREE(lck);
2472                 exit_server("push_deferred_open_message_smb failed");
2473         }
2474 }
2475
2476 static void defer_open_done(struct tevent_req *req)
2477 {
2478         struct defer_open_state *state = tevent_req_callback_data(
2479                 req, struct defer_open_state);
2480         NTSTATUS status;
2481         bool ret;
2482
2483         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2484         TALLOC_FREE(req);
2485         if (!NT_STATUS_IS_OK(status)) {
2486                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2487                           nt_errstr(status)));
2488                 /*
2489                  * Even if it failed, retry anyway. TODO: We need a way to
2490                  * tell a re-scheduled open about that error.
2491                  */
2492         }
2493
2494         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2495
2496         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2497         SMB_ASSERT(ret);
2498         TALLOC_FREE(state);
2499 }
2500
2501 /**
2502  * Actually attempt the kernel oplock polling open.
2503  */
2504
2505 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2506                                       struct tevent_timer *te,
2507                                       struct timeval current_time,
2508                                       void *private_data)
2509 {
2510         bool ok;
2511         struct smb_request *req = (struct smb_request *)private_data;
2512
2513         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2514         if (!ok) {
2515                 exit_server("schedule_deferred_open_message_smb failed");
2516         }
2517         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2518 }
2519
2520 /**
2521  * Reschedule an open for 1 second from now, if not timed out.
2522  **/
2523 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2524                        struct smb_request *req,
2525                        struct file_id id)
2526 {
2527
2528         bool ok;
2529         struct deferred_open_record *open_rec = NULL;
2530         /* Maximum wait time. */
2531         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2532
2533         if (request_timed_out(request_time, timeout)) {
2534                 return;
2535         }
2536
2537         open_rec = deferred_open_record_create(false, false, id);
2538         if (open_rec == NULL) {
2539                 exit_server("talloc failed");
2540         }
2541
2542         ok = push_deferred_open_message_smb(req,
2543                                             request_time,
2544                                             timeout,
2545                                             id,
2546                                             open_rec);
2547         if (!ok) {
2548                 exit_server("push_deferred_open_message_smb failed");
2549         }
2550
2551         /*
2552          * As this timer event is owned by req, it will
2553          * disappear if req it talloc_freed.
2554          */
2555         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2556                                         req,
2557                                         timeval_current_ofs(1, 0),
2558                                         kernel_oplock_poll_open_timer,
2559                                         req);
2560         if (open_rec->te == NULL) {
2561                 exit_server("tevent_add_timer failed");
2562         }
2563
2564         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2565                   timeval_string(talloc_tos(), &request_time, false),
2566                   req->mid,
2567                   file_id_string_tos(&id));
2568 }
2569
2570 /****************************************************************************
2571  On overwrite open ensure that the attributes match.
2572 ****************************************************************************/
2573
2574 static bool open_match_attributes(connection_struct *conn,
2575                                   uint32_t old_dos_attr,
2576                                   uint32_t new_dos_attr,
2577                                   mode_t new_unx_mode,
2578                                   mode_t *returned_unx_mode)
2579 {
2580         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2581
2582         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2583         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2584
2585         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2586            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2587                 *returned_unx_mode = new_unx_mode;
2588         } else {
2589                 *returned_unx_mode = (mode_t)0;
2590         }
2591
2592         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2593                   "new_dos_attr = 0x%x "
2594                   "returned_unx_mode = 0%o\n",
2595                   (unsigned int)old_dos_attr,
2596                   (unsigned int)new_dos_attr,
2597                   (unsigned int)*returned_unx_mode ));
2598
2599         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2600         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2601                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2602                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2603                         return False;
2604                 }
2605         }
2606         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2607                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2608                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2609                         return False;
2610                 }
2611         }
2612         return True;
2613 }
2614
2615 /****************************************************************************
2616  Special FCB or DOS processing in the case of a sharing violation.
2617  Try and find a duplicated file handle.
2618 ****************************************************************************/
2619
2620 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2621                                 connection_struct *conn,
2622                                 files_struct *fsp_to_dup_into,
2623                                 const struct smb_filename *smb_fname,
2624                                 struct file_id id,
2625                                 uint16_t file_pid,
2626                                 uint64_t vuid,
2627                                 uint32_t access_mask,
2628                                 uint32_t share_access,
2629                                 uint32_t create_options)
2630 {
2631         files_struct *fsp;
2632
2633         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2634                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2635
2636         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2637             fsp = file_find_di_next(fsp)) {
2638
2639                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2640                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2641                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2642                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2643                           (unsigned int)fsp->file_pid,
2644                           (unsigned int)fsp->fh->private_options,
2645                           (unsigned int)fsp->access_mask ));
2646
2647                 if (fsp != fsp_to_dup_into &&
2648                     fsp->fh->fd != -1 &&
2649                     fsp->vuid == vuid &&
2650                     fsp->file_pid == file_pid &&
2651                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2652                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2653                     (fsp->access_mask & FILE_WRITE_DATA) &&
2654                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2655                     strequal(fsp->fsp_name->stream_name,
2656                              smb_fname->stream_name)) {
2657                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2658                         break;
2659                 }
2660         }
2661
2662         if (!fsp) {
2663                 return NT_STATUS_NOT_FOUND;
2664         }
2665
2666         /* quite an insane set of semantics ... */
2667         if (is_executable(smb_fname->base_name) &&
2668             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2669                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2670                 return NT_STATUS_INVALID_PARAMETER;
2671         }
2672
2673         /* We need to duplicate this fsp. */
2674         return dup_file_fsp(req, fsp, access_mask, share_access,
2675                             create_options, fsp_to_dup_into);
2676 }
2677
2678 static void schedule_defer_open(struct share_mode_lock *lck,
2679                                 struct file_id id,
2680                                 struct timeval request_time,
2681                                 struct smb_request *req)
2682 {
2683         /* This is a relative time, added to the absolute
2684            request_time value to get the absolute timeout time.
2685            Note that if this is the second or greater time we enter
2686            this codepath for this particular request mid then
2687            request_time is left as the absolute time of the *first*
2688            time this request mid was processed. This is what allows
2689            the request to eventually time out. */
2690
2691         struct timeval timeout;
2692
2693         /* Normally the smbd we asked should respond within
2694          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2695          * the client did, give twice the timeout as a safety
2696          * measure here in case the other smbd is stuck
2697          * somewhere else. */
2698
2699         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2700
2701         if (request_timed_out(request_time, timeout)) {
2702                 return;
2703         }
2704
2705         defer_open(lck, request_time, timeout, req, true, id);
2706 }
2707
2708 /****************************************************************************
2709  Reschedule an open call that went asynchronous.
2710 ****************************************************************************/
2711
2712 static void schedule_async_open_timer(struct tevent_context *ev,
2713                                       struct tevent_timer *te,
2714                                       struct timeval current_time,
2715                                       void *private_data)
2716 {
2717         exit_server("async open timeout");
2718 }
2719
2720 static void schedule_async_open(struct timeval request_time,
2721                                 struct smb_request *req)
2722 {
2723         struct deferred_open_record *open_rec = NULL;
2724         struct timeval timeout = timeval_set(20, 0);
2725         bool ok;
2726
2727         if (request_timed_out(request_time, timeout)) {
2728                 return;
2729         }
2730
2731         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2732         if (open_rec == NULL) {
2733                 exit_server("deferred_open_record_create failed");
2734         }
2735
2736         ok = push_deferred_open_message_smb(req, request_time, timeout,
2737                                             (struct file_id){0}, open_rec);
2738         if (!ok) {
2739                 exit_server("push_deferred_open_message_smb failed");
2740         }
2741
2742         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2743                                         req,
2744                                         timeval_current_ofs(20, 0),
2745                                         schedule_async_open_timer,
2746                                         open_rec);
2747         if (open_rec->te == NULL) {
2748                 exit_server("tevent_add_timer failed");
2749         }
2750 }
2751
2752 /****************************************************************************
2753  Work out what access_mask to use from what the client sent us.
2754 ****************************************************************************/
2755
2756 static NTSTATUS smbd_calculate_maximum_allowed_access(
2757         connection_struct *conn,
2758         const struct smb_filename *smb_fname,
2759         bool use_privs,
2760         uint32_t *p_access_mask)
2761 {
2762         struct security_descriptor *sd;
2763         uint32_t access_granted;
2764         NTSTATUS status;
2765
2766         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2767                 *p_access_mask |= FILE_GENERIC_ALL;
2768                 return NT_STATUS_OK;
2769         }
2770
2771         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2772                                     (SECINFO_OWNER |
2773                                      SECINFO_GROUP |
2774                                      SECINFO_DACL),
2775                                     talloc_tos(), &sd);
2776
2777         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2778                 /*
2779                  * File did not exist
2780                  */
2781                 *p_access_mask = FILE_GENERIC_ALL;
2782                 return NT_STATUS_OK;
2783         }
2784         if (!NT_STATUS_IS_OK(status)) {
2785                 DEBUG(10,("Could not get acl on file %s: %s\n",
2786                           smb_fname_str_dbg(smb_fname),
2787                           nt_errstr(status)));
2788                 return NT_STATUS_ACCESS_DENIED;
2789         }
2790
2791         /*
2792          * If we can access the path to this file, by
2793          * default we have FILE_READ_ATTRIBUTES from the
2794          * containing directory. See the section:
2795          * "Algorithm to Check Access to an Existing File"
2796          * in MS-FSA.pdf.
2797          *
2798          * se_file_access_check()
2799          * also takes care of owner WRITE_DAC and READ_CONTROL.
2800          */
2801         status = se_file_access_check(sd,
2802                                  get_current_nttok(conn),
2803                                  use_privs,
2804                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2805                                  &access_granted);
2806
2807         TALLOC_FREE(sd);
2808
2809         if (!NT_STATUS_IS_OK(status)) {
2810                 DEBUG(10, ("Access denied on file %s: "
2811                            "when calculating maximum access\n",
2812                            smb_fname_str_dbg(smb_fname)));
2813                 return NT_STATUS_ACCESS_DENIED;
2814         }
2815         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2816
2817         if (!(access_granted & DELETE_ACCESS)) {
2818                 if (can_delete_file_in_directory(conn, smb_fname)) {
2819                         *p_access_mask |= DELETE_ACCESS;
2820                 }
2821         }
2822
2823         return NT_STATUS_OK;
2824 }
2825
2826 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2827                                     const struct smb_filename *smb_fname,
2828                                     bool use_privs,
2829                                     uint32_t access_mask,
2830                                     uint32_t *access_mask_out)
2831 {
2832         NTSTATUS status;
2833         uint32_t orig_access_mask = access_mask;
2834         uint32_t rejected_share_access;
2835
2836         if (access_mask & SEC_MASK_INVALID) {
2837                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2838                           access_mask);
2839                 return NT_STATUS_ACCESS_DENIED;
2840         }
2841
2842         /*
2843          * Convert GENERIC bits to specific bits.
2844          */
2845
2846         se_map_generic(&access_mask, &file_generic_mapping);
2847
2848         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2849         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2850
2851                 status = smbd_calculate_maximum_allowed_access(
2852                         conn, smb_fname, use_privs, &access_mask);
2853
2854                 if (!NT_STATUS_IS_OK(status)) {
2855                         return status;
2856                 }
2857
2858                 access_mask &= conn->share_access;
2859         }
2860
2861         rejected_share_access = access_mask & ~(conn->share_access);
2862
2863         if (rejected_share_access) {
2864                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2865                         "file %s: rejected by share access mask[0x%08X] "
2866                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2867                         smb_fname_str_dbg(smb_fname),
2868                         conn->share_access,
2869                         orig_access_mask, access_mask,
2870                         rejected_share_access));
2871                 return NT_STATUS_ACCESS_DENIED;
2872         }
2873
2874         *access_mask_out = access_mask;
2875         return NT_STATUS_OK;
2876 }
2877
2878 /****************************************************************************
2879  Remove the deferred open entry under lock.
2880 ****************************************************************************/
2881
2882 /****************************************************************************
2883  Return true if this is a state pointer to an asynchronous create.
2884 ****************************************************************************/
2885
2886 bool is_deferred_open_async(const struct deferred_open_record *rec)
2887 {
2888         return rec->async_open;
2889 }
2890
2891 static bool clear_ads(uint32_t create_disposition)
2892 {
2893         bool ret = false;
2894
2895         switch (create_disposition) {
2896         case FILE_SUPERSEDE:
2897         case FILE_OVERWRITE_IF:
2898         case FILE_OVERWRITE:
2899                 ret = true;
2900                 break;
2901         default:
2902                 break;
2903         }
2904         return ret;
2905 }
2906
2907 static int disposition_to_open_flags(uint32_t create_disposition)
2908 {
2909         int ret = 0;
2910
2911         /*
2912          * Currently we're using FILE_SUPERSEDE as the same as
2913          * FILE_OVERWRITE_IF but they really are
2914          * different. FILE_SUPERSEDE deletes an existing file
2915          * (requiring delete access) then recreates it.
2916          */
2917
2918         switch (create_disposition) {
2919         case FILE_SUPERSEDE:
2920         case FILE_OVERWRITE_IF:
2921                 /*
2922                  * If file exists replace/overwrite. If file doesn't
2923                  * exist create.
2924                  */
2925                 ret = O_CREAT|O_TRUNC;
2926                 break;
2927
2928         case FILE_OPEN:
2929                 /*
2930                  * If file exists open. If file doesn't exist error.
2931                  */
2932                 ret = 0;
2933                 break;
2934
2935         case FILE_OVERWRITE:
2936                 /*
2937                  * If file exists overwrite. If file doesn't exist
2938                  * error.
2939                  */
2940                 ret = O_TRUNC;
2941                 break;
2942
2943         case FILE_CREATE:
2944                 /*
2945                  * If file exists error. If file doesn't exist create.
2946                  */
2947                 ret = O_CREAT|O_EXCL;
2948                 break;
2949
2950         case FILE_OPEN_IF:
2951                 /*
2952                  * If file exists open. If file doesn't exist create.
2953                  */
2954                 ret = O_CREAT;
2955                 break;
2956         }
2957         return ret;
2958 }
2959
2960 static int calculate_open_access_flags(uint32_t access_mask,
2961                                        uint32_t private_flags)
2962 {
2963         bool need_write, need_read;
2964
2965         /*
2966          * Note that we ignore the append flag as append does not
2967          * mean the same thing under DOS and Unix.
2968          */
2969
2970         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2971         if (!need_write) {
2972                 return O_RDONLY;
2973         }
2974
2975         /* DENY_DOS opens are always underlying read-write on the
2976            file handle, no matter what the requested access mask
2977            says. */
2978
2979         need_read =
2980                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2981                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2982                                 FILE_READ_EA|FILE_EXECUTE));
2983
2984         if (!need_read) {
2985                 return O_WRONLY;
2986         }
2987         return O_RDWR;
2988 }
2989
2990 /****************************************************************************
2991  Open a file with a share mode. Passed in an already created files_struct *.
2992 ****************************************************************************/
2993
2994 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2995                             struct smb_request *req,
2996                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
2997                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
2998                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
2999                             uint32_t create_options,    /* options such as delete on close. */
3000                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3001                             int oplock_request,         /* internal Samba oplock codes. */
3002                             struct smb2_lease *lease,
3003                                                         /* Information (FILE_EXISTS etc.) */
3004                             uint32_t private_flags,     /* Samba specific flags. */
3005                             int *pinfo,
3006                             files_struct *fsp)
3007 {
3008         struct smb_filename *smb_fname = fsp->fsp_name;
3009         int flags=0;
3010         int flags2=0;
3011         bool file_existed = VALID_STAT(smb_fname->st);
3012         bool def_acl = False;
3013         bool posix_open = False;
3014         bool new_file_created = False;
3015         bool first_open_attempt = true;
3016         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
3017         mode_t new_unx_mode = (mode_t)0;
3018         mode_t unx_mode = (mode_t)0;
3019         int info;
3020         uint32_t existing_dos_attributes = 0;
3021         struct timeval request_time = timeval_zero();
3022         struct share_mode_lock *lck = NULL;
3023         uint32_t open_access_mask = access_mask;
3024         NTSTATUS status;
3025         char *parent_dir;
3026         SMB_STRUCT_STAT saved_stat = smb_fname->st;
3027         struct timespec old_write_time;
3028         struct file_id id;
3029
3030         if (conn->printer) {
3031                 /*
3032                  * Printers are handled completely differently.
3033                  * Most of the passed parameters are ignored.
3034                  */
3035
3036                 if (pinfo) {
3037                         *pinfo = FILE_WAS_CREATED;
3038                 }
3039
3040                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
3041                            smb_fname_str_dbg(smb_fname)));
3042
3043                 if (!req) {
3044                         DEBUG(0,("open_file_ntcreate: printer open without "
3045                                 "an SMB request!\n"));
3046                         return NT_STATUS_INTERNAL_ERROR;
3047                 }
3048
3049                 return print_spool_open(fsp, smb_fname->base_name,
3050                                         req->vuid);
3051         }
3052
3053         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3054                             NULL)) {
3055                 return NT_STATUS_NO_MEMORY;
3056         }
3057
3058         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3059                 posix_open = True;
3060                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3061                 new_dos_attributes = 0;
3062         } else {
3063                 /* Windows allows a new file to be created and
3064                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3065                    sent by the client. Do the same. */
3066
3067                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3068
3069                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3070                  * created new. */
3071                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3072                                      smb_fname, parent_dir);
3073         }
3074
3075         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3076                    "access_mask=0x%x share_access=0x%x "
3077                    "create_disposition = 0x%x create_options=0x%x "
3078                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3079                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3080                    access_mask, share_access, create_disposition,
3081                    create_options, (unsigned int)unx_mode, oplock_request,
3082                    (unsigned int)private_flags));
3083
3084         if (req == NULL) {
3085                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3086                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3087         } else {
3088                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3089                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3090         }
3091
3092         /*
3093          * Only non-internal opens can be deferred at all
3094          */
3095
3096         if (req) {
3097                 struct deferred_open_record *open_rec;
3098                 if (get_deferred_open_message_state(req,
3099                                 &request_time,
3100                                 &open_rec)) {
3101                         /* Remember the absolute time of the original
3102                            request with this mid. We'll use it later to
3103                            see if this has timed out. */
3104
3105                         /* If it was an async create retry, the file
3106                            didn't exist. */
3107
3108                         if (is_deferred_open_async(open_rec)) {
3109                                 SET_STAT_INVALID(smb_fname->st);
3110                                 file_existed = false;
3111                         }
3112
3113                         /* Ensure we don't reprocess this message. */
3114                         remove_deferred_open_message_smb(req->xconn, req->mid);
3115
3116                         first_open_attempt = false;
3117                 }
3118         }
3119
3120         if (!posix_open) {
3121                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3122                 if (file_existed) {
3123                         /*
3124                          * Only use strored DOS attributes for checks
3125                          * against requested attributes (below via
3126                          * open_match_attributes()), cf bug #11992
3127                          * for details. -slow
3128                          */
3129                         uint32_t attr = 0;
3130
3131                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3132                         if (NT_STATUS_IS_OK(status)) {
3133                                 existing_dos_attributes = attr;
3134                         }
3135                 }
3136         }
3137
3138         /* ignore any oplock requests if oplocks are disabled */
3139         if (!lp_oplocks(SNUM(conn)) ||
3140             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3141                 /* Mask off everything except the private Samba bits. */
3142                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3143         }
3144
3145         /* this is for OS/2 long file names - say we don't support them */
3146         if (req != NULL && !req->posix_pathnames &&
3147                         strstr(smb_fname->base_name,".+,;=[].")) {
3148                 /* OS/2 Workplace shell fix may be main code stream in a later
3149                  * release. */
3150                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3151                          "supported.\n"));
3152                 if (use_nt_status()) {
3153                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3154                 }
3155                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3156         }
3157
3158         switch( create_disposition ) {
3159                 case FILE_OPEN:
3160                         /* If file exists open. If file doesn't exist error. */
3161                         if (!file_existed) {
3162                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
3163                                          "requested for file %s and file "
3164                                          "doesn't exist.\n",
3165                                          smb_fname_str_dbg(smb_fname)));
3166                                 errno = ENOENT;
3167                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3168                         }
3169                         break;
3170
3171                 case FILE_OVERWRITE:
3172                         /* If file exists overwrite. If file doesn't exist
3173                          * error. */
3174                         if (!file_existed) {
3175                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3176                                          "requested for file %s and file "
3177                                          "doesn't exist.\n",
3178                                          smb_fname_str_dbg(smb_fname) ));
3179                                 errno = ENOENT;
3180                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3181                         }
3182                         break;
3183
3184                 case FILE_CREATE:
3185                         /* If file exists error. If file doesn't exist
3186                          * create. */
3187                         if (file_existed) {
3188                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3189                                          "requested for file %s and file "
3190                                          "already exists.\n",
3191                                          smb_fname_str_dbg(smb_fname)));
3192                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3193                                         errno = EISDIR;
3194                                 } else {
3195                                         errno = EEXIST;
3196                                 }
3197                                 return map_nt_error_from_unix(errno);
3198                         }
3199                         break;
3200
3201                 case FILE_SUPERSEDE:
3202                 case FILE_OVERWRITE_IF:
3203                 case FILE_OPEN_IF:
3204                         break;
3205                 default:
3206                         return NT_STATUS_INVALID_PARAMETER;
3207         }
3208
3209         flags2 = disposition_to_open_flags(create_disposition);
3210
3211         /* We only care about matching attributes on file exists and
3212          * overwrite. */
3213
3214         if (!posix_open && file_existed &&
3215             ((create_disposition == FILE_OVERWRITE) ||
3216              (create_disposition == FILE_OVERWRITE_IF))) {
3217                 if (!open_match_attributes(conn, existing_dos_attributes,
3218                                            new_dos_attributes,
3219                                            unx_mode, &new_unx_mode)) {
3220                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3221                                  "for file %s (%x %x) (0%o, 0%o)\n",
3222                                  smb_fname_str_dbg(smb_fname),
3223                                  existing_dos_attributes,
3224                                  new_dos_attributes,
3225                                  (unsigned int)smb_fname->st.st_ex_mode,
3226                                  (unsigned int)unx_mode ));
3227                         errno = EACCES;
3228                         return NT_STATUS_ACCESS_DENIED;
3229                 }
3230         }
3231
3232         status = smbd_calculate_access_mask(conn, smb_fname,
3233                                         false,
3234                                         access_mask,
3235                                         &access_mask);
3236         if (!NT_STATUS_IS_OK(status)) {
3237                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3238                         "on file %s returned %s\n",
3239                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3240                 return status;
3241         }
3242
3243         open_access_mask = access_mask;
3244
3245         if (flags2 & O_TRUNC) {
3246                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3247         }
3248
3249         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3250                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3251                     access_mask));
3252
3253         /*
3254          * Note that we ignore the append flag as append does not
3255          * mean the same thing under DOS and Unix.
3256          */
3257
3258         flags = calculate_open_access_flags(access_mask, private_flags);
3259
3260         /*
3261          * Currently we only look at FILE_WRITE_THROUGH for create options.
3262          */
3263
3264 #if defined(O_SYNC)
3265         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3266                 flags2 |= O_SYNC;
3267         }
3268 #endif /* O_SYNC */
3269
3270         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3271                 flags2 |= O_APPEND;
3272         }
3273
3274         if (!posix_open && !CAN_WRITE(conn)) {
3275                 /*
3276                  * We should really return a permission denied error if either
3277                  * O_CREAT or O_TRUNC are set, but for compatibility with
3278                  * older versions of Samba we just AND them out.
3279                  */
3280                 flags2 &= ~(O_CREAT|O_TRUNC);
3281         }
3282
3283         if (lp_kernel_oplocks(SNUM(conn))) {
3284                 /*
3285                  * With kernel oplocks the open breaking an oplock
3286                  * blocks until the oplock holder has given up the
3287                  * oplock or closed the file. We prevent this by always
3288                  * trying to open the file with O_NONBLOCK (see "man
3289                  * fcntl" on Linux).
3290                  *
3291                  * If a process that doesn't use the smbd open files
3292                  * database or communication methods holds a kernel
3293                  * oplock we must periodically poll for available open
3294                  * using O_NONBLOCK.
3295                  */
3296                 flags2 |= O_NONBLOCK;
3297         }
3298
3299         /*
3300          * Ensure we can't write on a read-only share or file.
3301          */
3302
3303         if (flags != O_RDONLY && file_existed &&
3304             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3305                 DEBUG(5,("open_file_ntcreate: write access requested for "
3306                          "file %s on read only %s\n",
3307                          smb_fname_str_dbg(smb_fname),
3308                          !CAN_WRITE(conn) ? "share" : "file" ));
3309                 errno = EACCES;
3310                 return NT_STATUS_ACCESS_DENIED;
3311         }
3312
3313         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3314         fsp->share_access = share_access;
3315         fsp->fh->private_options = private_flags;
3316         fsp->access_mask = open_access_mask; /* We change this to the
3317                                               * requested access_mask after
3318                                               * the open is done. */
3319         if (posix_open) {
3320                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3321         }
3322
3323         if (timeval_is_zero(&request_time)) {
3324                 request_time = fsp->open_time;
3325         }
3326
3327         if ((create_options & FILE_DELETE_ON_CLOSE) &&
3328                         (flags2 & O_CREAT) &&
3329                         !file_existed) {
3330                 /* Delete on close semantics for new files. */
3331                 status = can_set_delete_on_close(fsp,
3332                                                 new_dos_attributes);
3333                 if (!NT_STATUS_IS_OK(status)) {
3334                         fd_close(fsp);
3335                         return status;
3336                 }
3337         }
3338
3339         /*
3340          * Ensure we pay attention to default ACLs on directories if required.
3341          */
3342
3343         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3344             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3345                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3346         }
3347
3348         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3349                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3350                  (unsigned int)flags, (unsigned int)flags2,
3351                  (unsigned int)unx_mode, (unsigned int)access_mask,
3352                  (unsigned int)open_access_mask));
3353
3354         fsp_open = open_file(fsp, conn, req, parent_dir,
3355                              flags|flags2, unx_mode, access_mask,
3356                              open_access_mask, &new_file_created);
3357
3358         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3359                 bool delay;
3360
3361                 /*
3362                  * This handles the kernel oplock case:
3363                  *
3364                  * the file has an active kernel oplock and the open() returned
3365                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3366                  *
3367                  * "Samba locking.tdb oplocks" are handled below after acquiring
3368                  * the sharemode lock with get_share_mode_lock().
3369                  */
3370                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3371                         DEBUG(10, ("FIFO busy\n"));
3372                         return NT_STATUS_NETWORK_BUSY;
3373                 }
3374                 if (req == NULL) {
3375                         DEBUG(10, ("Internal open busy\n"));
3376                         return NT_STATUS_NETWORK_BUSY;
3377                 }
3378
3379                 /*
3380                  * From here on we assume this is an oplock break triggered
3381                  */
3382
3383                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3384                 if (lck == NULL) {
3385                         /*
3386                          * No oplock from Samba around. Set up a poll every 1
3387                          * second to retry a non-blocking open until the time
3388                          * expires.
3389                          */
3390                         setup_kernel_oplock_poll_open(request_time,
3391                                                 req,
3392                                                 fsp->file_id);
3393                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3394                                 "Retrying with poll\n");
3395                         return NT_STATUS_SHARING_VIOLATION;
3396                 }
3397
3398                 if (!validate_oplock_types(lck)) {
3399                         smb_panic("validate_oplock_types failed");
3400                 }
3401
3402                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3403                                          create_disposition,
3404                                          first_open_attempt);
3405                 if (delay) {
3406                         schedule_defer_open(lck, fsp->file_id, request_time,
3407                                             req);
3408                         TALLOC_FREE(lck);
3409                         DEBUG(10, ("Sent oplock break request to kernel "
3410                                    "oplock holder\n"));
3411                         return NT_STATUS_SHARING_VIOLATION;
3412                 }
3413
3414                 /*
3415                  * No oplock from Samba around. Set up a poll every 1
3416                  * second to retry a non-blocking open until the time
3417                  * expires.
3418                  */
3419                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3420
3421                 TALLOC_FREE(lck);
3422                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3423                         "Retrying with poll\n");
3424                 return NT_STATUS_SHARING_VIOLATION;
3425         }
3426
3427         if (!NT_STATUS_IS_OK(fsp_open)) {
3428                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3429                         schedule_async_open(request_time, req);
3430                 }
3431                 return fsp_open;
3432         }
3433
3434         if (new_file_created) {
3435                 /*
3436                  * As we atomically create using O_CREAT|O_EXCL,
3437                  * then if new_file_created is true, then
3438                  * file_existed *MUST* have been false (even
3439                  * if the file was previously detected as being
3440                  * there).
3441                  */
3442                 file_existed = false;
3443         }
3444
3445         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3446                 /*
3447                  * The file did exist, but some other (local or NFS)
3448                  * process either renamed/unlinked and re-created the
3449                  * file with different dev/ino after we walked the path,
3450                  * but before we did the open. We could retry the
3451                  * open but it's a rare enough case it's easier to
3452                  * just fail the open to prevent creating any problems
3453                  * in the open file db having the wrong dev/ino key.
3454                  */
3455                 fd_close(fsp);
3456                 DBG_WARNING("file %s - dev/ino mismatch. "
3457                             "Old (dev=%ju, ino=%ju). "
3458                             "New (dev=%ju, ino=%ju). Failing open "
3459                             "with NT_STATUS_ACCESS_DENIED.\n",
3460                             smb_fname_str_dbg(smb_fname),
3461                             (uintmax_t)saved_stat.st_ex_dev,
3462                             (uintmax_t)saved_stat.st_ex_ino,
3463                             (uintmax_t)smb_fname->st.st_ex_dev,
3464                             (uintmax_t)smb_fname->st.st_ex_ino);
3465                 return NT_STATUS_ACCESS_DENIED;
3466         }
3467
3468         old_write_time = smb_fname->st.st_ex_mtime;
3469
3470         /*
3471          * Deal with the race condition where two smbd's detect the
3472          * file doesn't exist and do the create at the same time. One
3473          * of them will win and set a share mode, the other (ie. this
3474          * one) should check if the requested share mode for this
3475          * create is allowed.
3476          */
3477
3478         /*
3479          * Now the file exists and fsp is successfully opened,
3480          * fsp->dev and fsp->inode are valid and should replace the
3481          * dev=0,inode=0 from a non existent file. Spotted by
3482          * Nadav Danieli <nadavd@exanet.com>. JRA.
3483          */
3484
3485         id = fsp->file_id;
3486
3487         lck = get_share_mode_lock(talloc_tos(), id,
3488                                   conn->connectpath,
3489                                   smb_fname, &old_write_time);
3490
3491         if (lck == NULL) {
3492                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3493                           "mode lock for %s\n",
3494                           smb_fname_str_dbg(smb_fname)));
3495                 fd_close(fsp);
3496                 return NT_STATUS_SHARING_VIOLATION;
3497         }
3498
3499         /* Get the types we need to examine. */
3500         if (!validate_oplock_types(lck)) {
3501                 smb_panic("validate_oplock_types failed");
3502         }
3503
3504         if (has_delete_on_close(lck, fsp->name_hash)) {
3505                 TALLOC_FREE(lck);
3506                 fd_close(fsp);
3507                 return NT_STATUS_DELETE_PENDING;
3508         }
3509
3510         status = open_mode_check(conn, lck,
3511                                  access_mask, share_access);
3512
3513         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3514             (lck->data->num_share_modes > 0)) {
3515                 /*
3516                  * This comes from ancient times out of open_mode_check. I
3517                  * have no clue whether this is still necessary. I can't think
3518                  * of a case where this would actually matter further down in
3519                  * this function. I leave it here for further investigation
3520                  * :-)
3521                  */
3522                 file_existed = true;
3523         }
3524
3525         if (req != NULL) {
3526                 /*
3527                  * Handle oplocks, deferring the request if delay_for_oplock()
3528                  * triggered a break message and we have to wait for the break
3529                  * response.
3530                  */
3531                 bool delay;
3532                 bool sharing_violation = NT_STATUS_EQUAL(
3533                         status, NT_STATUS_SHARING_VIOLATION);
3534
3535                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3536                                          sharing_violation,
3537                                          create_disposition,
3538                                          first_open_attempt);
3539                 if (delay) {
3540                         schedule_defer_open(lck, fsp->file_id,
3541                                             request_time, req);
3542                         TALLOC_FREE(lck);
3543                         fd_close(fsp);
3544                         return NT_STATUS_SHARING_VIOLATION;
3545                 }
3546         }
3547
3548         if (!NT_STATUS_IS_OK(status)) {
3549                 uint32_t can_access_mask;
3550                 bool can_access = True;
3551
3552                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3553
3554                 /* Check if this can be done with the deny_dos and fcb
3555                  * calls. */
3556                 if (private_flags &
3557                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3558                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3559                         if (req == NULL) {
3560                                 DEBUG(0, ("DOS open without an SMB "
3561                                           "request!\n"));
3562                                 TALLOC_FREE(lck);
3563                                 fd_close(fsp);
3564                                 return NT_STATUS_INTERNAL_ERROR;
3565                         }
3566
3567                         /* Use the client requested access mask here,
3568                          * not the one we open with. */
3569                         status = fcb_or_dos_open(req,
3570                                                  conn,
3571                                                  fsp,
3572                                                  smb_fname,
3573                                                  id,
3574                                                  req->smbpid,
3575                                                  req->vuid,
3576                                                  access_mask,
3577                                                  share_access,
3578                                                  create_options);
3579
3580                         if (NT_STATUS_IS_OK(status)) {
3581                                 TALLOC_FREE(lck);
3582                                 if (pinfo) {
3583                                         *pinfo = FILE_WAS_OPENED;
3584                                 }
3585                                 return NT_STATUS_OK;
3586                         }
3587                 }
3588
3589                 /*
3590                  * This next line is a subtlety we need for
3591                  * MS-Access. If a file open will fail due to share
3592                  * permissions and also for security (access) reasons,
3593                  * we need to return the access failed error, not the
3594                  * share error. We can't open the file due to kernel
3595                  * oplock deadlock (it's possible we failed above on
3596                  * the open_mode_check()) so use a userspace check.
3597                  */
3598
3599                 if (flags & O_RDWR) {
3600                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3601                 } else if (flags & O_WRONLY) {
3602                         can_access_mask = FILE_WRITE_DATA;
3603                 } else {
3604                         can_access_mask = FILE_READ_DATA;
3605                 }
3606
3607                 if (((can_access_mask & FILE_WRITE_DATA) &&
3608                      !CAN_WRITE(conn)) ||
3609                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3610                                                               smb_fname,
3611                                                               false,
3612                                                               can_access_mask))) {
3613                         can_access = False;
3614                 }
3615
3616                 /*
3617                  * If we're returning a share violation, ensure we
3618                  * cope with the braindead 1 second delay (SMB1 only).
3619                  */
3620
3621                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3622                     !conn->sconn->using_smb2 &&
3623                     lp_defer_sharing_violations()) {
3624                         struct timeval timeout;
3625                         int timeout_usecs;
3626
3627                         /* this is a hack to speed up torture tests
3628                            in 'make test' */
3629                         timeout_usecs = lp_parm_int(SNUM(conn),
3630                                                     "smbd","sharedelay",
3631                                                     SHARING_VIOLATION_USEC_WAIT);
3632
3633                         /* This is a relative time, added to the absolute
3634                            request_time value to get the absolute timeout time.
3635                            Note that if this is the second or greater time we enter
3636                            this codepath for this particular request mid then
3637                            request_time is left as the absolute time of the *first*
3638                            time this request mid was processed. This is what allows
3639                            the request to eventually time out. */
3640
3641                         timeout = timeval_set(0, timeout_usecs);
3642
3643                         if (!request_timed_out(request_time, timeout)) {
3644                                 defer_open(lck, request_time, timeout, req,
3645                                            false, id);
3646                         }
3647                 }
3648
3649                 TALLOC_FREE(lck);
3650                 fd_close(fsp);
3651                 if (can_access) {
3652                         /*
3653                          * We have detected a sharing violation here
3654                          * so return the correct error code
3655                          */
3656                         status = NT_STATUS_SHARING_VIOLATION;
3657                 } else {
3658                         status = NT_STATUS_ACCESS_DENIED;
3659                 }
3660                 return status;
3661         }
3662
3663         /* Should we atomically (to the client at least) truncate ? */
3664         if ((!new_file_created) &&
3665             (flags2 & O_TRUNC) &&
3666             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3667                 int ret;
3668
3669                 ret = vfs_set_filelen(fsp, 0);
3670                 if (ret != 0) {
3671                         status = map_nt_error_from_unix(errno);
3672                         TALLOC_FREE(lck);
3673                         fd_close(fsp);
3674                         return status;
3675                 }
3676         }
3677
3678         /*
3679          * We have the share entry *locked*.....
3680          */
3681
3682         /* Delete streams if create_disposition requires it */
3683         if (!new_file_created && clear_ads(create_disposition) &&
3684             !is_ntfs_stream_smb_fname(smb_fname)) {
3685                 status = delete_all_streams(conn, smb_fname);
3686                 if (!NT_STATUS_IS_OK(status)) {
3687                         TALLOC_FREE(lck);
3688                         fd_close(fsp);
3689                         return status;
3690                 }
3691         }
3692
3693         /* note that we ignore failure for the following. It is
3694            basically a hack for NFS, and NFS will never set one of
3695            these only read them. Nobody but Samba can ever set a deny
3696            mode and we have already checked our more authoritative
3697            locking database for permission to set this deny mode. If
3698            the kernel refuses the operations then the kernel is wrong.
3699            note that GPFS supports it as well - jmcd */
3700
3701         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3702                 int ret_flock;
3703                 /*
3704                  * Beware: streams implementing VFS modules may
3705                  * implement streams in a way that fsp will have the
3706                  * basefile open in the fsp fd, so lacking a distinct
3707                  * fd for the stream kernel_flock will apply on the
3708                  * basefile which is wrong. The actual check is
3709                  * deffered to the VFS module implementing the
3710                  * kernel_flock call.
3711                  */
3712                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3713                 if(ret_flock == -1 ){
3714
3715                         TALLOC_FREE(lck);
3716                         fd_close(fsp);
3717
3718                         return NT_STATUS_SHARING_VIOLATION;
3719                 }
3720
3721                 fsp->kernel_share_modes_taken = true;
3722         }
3723
3724         /*
3725          * At this point onwards, we can guarantee that the share entry
3726          * is locked, whether we created the file or not, and that the
3727          * deny mode is compatible with all current opens.
3728          */
3729
3730         /*
3731          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3732          * but we don't have to store this - just ignore it on access check.
3733          */
3734         if (conn->sconn->using_smb2) {
3735                 /*
3736                  * SMB2 doesn't return it (according to Microsoft tests).
3737                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3738                  * File created with access = 0x7 (Read, Write, Delete)
3739                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3740                  */
3741                 fsp->access_mask = access_mask;
3742         } else {
3743                 /* But SMB1 does. */
3744                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3745         }
3746
3747         if (file_existed) {
3748                 /*
3749                  * stat opens on existing files don't get oplocks.
3750                  * They can get leases.
3751                  *
3752                  * Note that we check for stat open on the *open_access_mask*,
3753                  * i.e. the access mask we actually used to do the open,
3754                  * not the one the client asked for (which is in
3755                  * fsp->access_mask). This is due to the fact that
3756                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3757                  * which adds FILE_WRITE_DATA to open_access_mask.
3758                  */
3759                 if (is_stat_open(open_access_mask) && lease == NULL) {
3760                         oplock_request = NO_OPLOCK;
3761                 }
3762         }
3763
3764         if (new_file_created) {
3765                 info = FILE_WAS_CREATED;
3766         } else {
3767                 if (flags2 & O_TRUNC) {
3768                         info = FILE_WAS_OVERWRITTEN;
3769                 } else {
3770                         info = FILE_WAS_OPENED;
3771                 }
3772         }
3773
3774         if (pinfo) {
3775                 *pinfo = info;
3776         }
3777
3778         /*
3779          * Setup the oplock info in both the shared memory and
3780          * file structs.
3781          */
3782         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3783         if (!NT_STATUS_IS_OK(status)) {
3784                 TALLOC_FREE(lck);
3785                 fd_close(fsp);
3786                 return status;
3787         }
3788
3789         /* Handle strange delete on close create semantics. */
3790         if (create_options & FILE_DELETE_ON_CLOSE) {
3791                 if (!new_file_created) {
3792                         status = can_set_delete_on_close(fsp,
3793                                          existing_dos_attributes);
3794
3795                         if (!NT_STATUS_IS_OK(status)) {
3796                                 /* Remember to delete the mode we just added. */
3797                                 del_share_mode(lck, fsp);
3798                                 TALLOC_FREE(lck);
3799                                 fd_close(fsp);
3800                                 return status;
3801                         }
3802                 }
3803                 /* Note that here we set the *initial* delete on close flag,
3804                    not the regular one. The magic gets handled in close. */
3805                 fsp->initial_delete_on_close = True;
3806         }
3807
3808         if (info != FILE_WAS_OPENED) {
3809                 /* Overwritten files should be initially set as archive */
3810                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3811                     lp_store_dos_attributes(SNUM(conn))) {
3812                         if (!posix_open) {
3813                                 if (file_set_dosmode(conn, smb_fname,
3814                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3815                                             parent_dir, true) == 0) {
3816                                         unx_mode = smb_fname->st.st_ex_mode;
3817                                 }
3818                         }
3819                 }
3820         }
3821
3822         /* Determine sparse flag. */
3823         if (posix_open) {
3824                 /* POSIX opens are sparse by default. */
3825                 fsp->is_sparse = true;
3826         } else {
3827                 fsp->is_sparse = (file_existed &&
3828                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3829         }
3830
3831         /*
3832          * Take care of inherited ACLs on created files - if default ACL not
3833          * selected.
3834          */
3835
3836         if (!posix_open && new_file_created && !def_acl) {
3837                 if (unx_mode != smb_fname->st.st_ex_mode) {
3838                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3839                         if (ret == -1) {
3840                                 DBG_INFO("failed to reset "
3841                                   "attributes of file %s to 0%o\n",
3842                                   smb_fname_str_dbg(smb_fname),
3843                                   (unsigned int)unx_mode);
3844                         }
3845                 }
3846
3847         } else if (new_unx_mode) {
3848                 /*
3849                  * We only get here in the case of:
3850                  *
3851                  * a). Not a POSIX open.
3852                  * b). File already existed.
3853                  * c). File was overwritten.
3854                  * d). Requested DOS attributes didn't match
3855                  *     the DOS attributes on the existing file.
3856                  *
3857                  * In that case new_unx_mode has been set
3858                  * equal to the calculated mode (including
3859                  * possible inheritance of the mode from the
3860                  * containing directory).
3861                  *
3862                  * Note this mode was calculated with the
3863                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3864                  * so the mode change here is suitable for
3865                  * an overwritten file.
3866                  */
3867
3868                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3869                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3870                         if (ret == -1) {
3871                                 DBG_INFO("failed to reset "
3872                                   "attributes of file %s to 0%o\n",
3873                                   smb_fname_str_dbg(smb_fname),
3874                                   (unsigned int)new_unx_mode);
3875                         }
3876                 }
3877         }
3878
3879         {
3880                 /*
3881                  * Deal with other opens having a modified write time.
3882                  */
3883                 struct timespec write_time = get_share_mode_write_time(lck);
3884
3885                 if (!null_timespec(write_time)) {
3886                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3887                 }
3888         }
3889
3890         TALLOC_FREE(lck);
3891
3892         return NT_STATUS_OK;
3893 }
3894
3895 static NTSTATUS mkdir_internal(connection_struct *conn,
3896                                struct smb_filename *smb_dname,
3897                                uint32_t file_attributes)
3898 {
3899         mode_t mode;
3900         char *parent_dir = NULL;
3901         NTSTATUS status;
3902         bool posix_open = false;
3903         bool need_re_stat = false;
3904         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3905
3906         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3907                 DEBUG(5,("mkdir_internal: failing share access "
3908                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3909                 return NT_STATUS_ACCESS_DENIED;
3910         }
3911
3912         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3913                             NULL)) {
3914                 return NT_STATUS_NO_MEMORY;
3915         }
3916
3917         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3918                 posix_open = true;
3919                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3920         } else {
3921                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3922         }
3923
3924         status = check_parent_access(conn,
3925                                         smb_dname,
3926                                         access_mask);
3927         if(!NT_STATUS_IS_OK(status)) {
3928                 DEBUG(5,("mkdir_internal: check_parent_access "
3929                         "on directory %s for path %s returned %s\n",
3930                         parent_dir,
3931                         smb_dname->base_name,
3932                         nt_errstr(status) ));
3933                 return status;
3934         }
3935
3936         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3937                 return map_nt_error_from_unix(errno);
3938         }
3939
3940         /* Ensure we're checking for a symlink here.... */
3941         /* We don't want to get caught by a symlink racer. */
3942
3943         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3944                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3945                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3946                 return map_nt_error_from_unix(errno);
3947         }
3948
3949         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3950                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3951                           smb_fname_str_dbg(smb_dname)));
3952                 return NT_STATUS_NOT_A_DIRECTORY;
3953         }
3954
3955         if (lp_store_dos_attributes(SNUM(conn))) {
3956                 if (!posix_open) {
3957                         file_set_dosmode(conn, smb_dname,
3958                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3959                                          parent_dir, true);
3960                 }
3961         }
3962
3963         if (lp_inherit_permissions(SNUM(conn))) {
3964                 inherit_access_posix_acl(conn, parent_dir,
3965                                          smb_dname, mode);
3966                 need_re_stat = true;
3967         }
3968
3969         if (!posix_open) {
3970                 /*
3971                  * Check if high bits should have been set,
3972                  * then (if bits are missing): add them.
3973                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3974                  * dir.
3975                  */
3976                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3977                     (mode & ~smb_dname->st.st_ex_mode)) {
3978                         SMB_VFS_CHMOD(conn, smb_dname,
3979                                       (smb_dname->st.st_ex_mode |
3980                                           (mode & ~smb_dname->st.st_ex_mode)));
3981                         need_re_stat = true;
3982                 }
3983         }
3984
3985         /* Change the owner if required. */
3986         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
3987                 change_dir_owner_to_parent(conn, parent_dir,
3988                                            smb_dname,
3989                                            &smb_dname->st);
3990                 need_re_stat = true;
3991         }
3992
3993         if (need_re_stat) {
3994                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3995                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3996                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3997                         return map_nt_error_from_unix(errno);
3998                 }
3999         }
4000
4001         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
4002                      smb_dname->base_name);
4003
4004         return NT_STATUS_OK;
4005 }
4006
4007 /****************************************************************************
4008  Open a directory from an NT SMB call.
4009 ****************************************************************************/
4010
4011 static NTSTATUS open_directory(connection_struct *conn,
4012                                struct smb_request *req,
4013                                struct smb_filename *smb_dname,
4014                                uint32_t access_mask,
4015                                uint32_t share_access,
4016                                uint32_t create_disposition,
4017                                uint32_t create_options,
4018                                uint32_t file_attributes,
4019                                int *pinfo,
4020                                files_struct **result)
4021 {
4022         files_struct *fsp = NULL;
4023         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
4024         struct share_mode_lock *lck = NULL;
4025         NTSTATUS status;
4026         struct timespec mtimespec;
4027         int info = 0;
4028         bool ok;
4029
4030         if (is_ntfs_stream_smb_fname(smb_dname)) {
4031                 DEBUG(2, ("open_directory: %s is a stream name!\n",
4032                           smb_fname_str_dbg(smb_dname)));
4033                 return NT_STATUS_NOT_A_DIRECTORY;
4034         }
4035
4036         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
4037                 /* Ensure we have a directory attribute. */
4038                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
4039         }
4040
4041         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
4042                  "share_access = 0x%x create_options = 0x%x, "
4043                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
4044                  smb_fname_str_dbg(smb_dname),
4045                  (unsigned int)access_mask,
4046                  (unsigned int)share_access,
4047                  (unsigned int)create_options,
4048                  (unsigned int)create_disposition,
4049                  (unsigned int)file_attributes));
4050
4051         status = smbd_calculate_access_mask(conn, smb_dname, false,
4052                                             access_mask, &access_mask);
4053         if (!NT_STATUS_IS_OK(status)) {
4054                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
4055                         "on file %s returned %s\n",
4056                         smb_fname_str_dbg(smb_dname),
4057                         nt_errstr(status)));
4058                 return status;
4059         }
4060
4061         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4062                         !security_token_has_privilege(get_current_nttok(conn),
4063                                         SEC_PRIV_SECURITY)) {
4064                 DEBUG(10, ("open_directory: open on %s "
4065                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4066                         smb_fname_str_dbg(smb_dname)));
4067                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4068         }
4069
4070         switch( create_disposition ) {
4071                 case FILE_OPEN:
4072
4073                         if (!dir_existed) {
4074                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4075                         }
4076
4077                         info = FILE_WAS_OPENED;
4078                         break;
4079
4080                 case FILE_CREATE:
4081
4082                         /* If directory exists error. If directory doesn't
4083                          * exist create. */
4084
4085                         if (dir_existed) {
4086                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4087                                 DEBUG(2, ("open_directory: unable to create "
4088                                           "%s. Error was %s\n",
4089                                           smb_fname_str_dbg(smb_dname),
4090                                           nt_errstr(status)));
4091                                 return status;
4092                         }
4093
4094                         status = mkdir_internal(conn, smb_dname,
4095                                                 file_attributes);
4096
4097                         if (!NT_STATUS_IS_OK(status)) {
4098                                 DEBUG(2, ("open_directory: unable to create "
4099                                           "%s. Error was %s\n",
4100                                           smb_fname_str_dbg(smb_dname),
4101                                           nt_errstr(status)));
4102                                 return status;
4103                         }
4104
4105                         info = FILE_WAS_CREATED;
4106                         break;
4107
4108                 case FILE_OPEN_IF:
4109                         /*
4110                          * If directory exists open. If directory doesn't
4111                          * exist create.
4112                          */
4113
4114                         if (dir_existed) {
4115                                 status = NT_STATUS_OK;
4116                                 info = FILE_WAS_OPENED;
4117                         } else {
4118                                 status = mkdir_internal(conn, smb_dname,
4119                                                 file_attributes);
4120
4121                                 if (NT_STATUS_IS_OK(status)) {
4122                                         info = FILE_WAS_CREATED;
4123                                 } else {
4124                                         /* Cope with create race. */
4125                                         if (!NT_STATUS_EQUAL(status,
4126                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4127                                                 DEBUG(2, ("open_directory: unable to create "
4128                                                         "%s. Error was %s\n",
4129                                                         smb_fname_str_dbg(smb_dname),
4130                                                         nt_errstr(status)));
4131                                                 return status;
4132                                         }
4133
4134                                         /*
4135                                          * If mkdir_internal() returned
4136                                          * NT_STATUS_OBJECT_NAME_COLLISION
4137                                          * we still must lstat the path.
4138                                          */
4139
4140                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4141                                                         == -1) {
4142                                                 DEBUG(2, ("Could not stat "
4143                                                         "directory '%s' just "
4144                                                         "opened: %s\n",
4145                                                         smb_fname_str_dbg(
4146                                                                 smb_dname),
4147                                                         strerror(errno)));
4148                                                 return map_nt_error_from_unix(
4149                                                                 errno);
4150                                         }
4151
4152                                         info = FILE_WAS_OPENED;
4153                                 }
4154                         }
4155
4156                         break;
4157
4158                 case FILE_SUPERSEDE:
4159                 case FILE_OVERWRITE:
4160                 case FILE_OVERWRITE_IF:
4161                 default:
4162                         DEBUG(5,("open_directory: invalid create_disposition "
4163                                  "0x%x for directory %s\n",
4164                                  (unsigned int)create_disposition,
4165                                  smb_fname_str_dbg(smb_dname)));
4166                         return NT_STATUS_INVALID_PARAMETER;
4167         }
4168
4169         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4170                 DEBUG(5,("open_directory: %s is not a directory !\n",
4171                          smb_fname_str_dbg(smb_dname)));
4172                 return NT_STATUS_NOT_A_DIRECTORY;
4173         }
4174
4175         if (info == FILE_WAS_OPENED) {
4176                 status = smbd_check_access_rights(conn,
4177                                                 smb_dname,
4178                                                 false,
4179                                                 access_mask);
4180                 if (!NT_STATUS_IS_OK(status)) {
4181                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4182                                 "file %s failed with %s\n",
4183                                 smb_fname_str_dbg(smb_dname),
4184                                 nt_errstr(status)));
4185                         return status;
4186                 }
4187         }
4188
4189         status = file_new(req, conn, &fsp);
4190         if(!NT_STATUS_IS_OK(status)) {
4191                 return status;
4192         }
4193
4194         /*
4195          * Setup the files_struct for it.
4196          */
4197
4198         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4199         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4200         fsp->file_pid = req ? req->smbpid : 0;
4201         fsp->can_lock = False;
4202         fsp->can_read = False;
4203         fsp->can_write = False;
4204
4205         fsp->share_access = share_access;
4206         fsp->fh->private_options = 0;
4207         /*
4208          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4209          */
4210         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4211         fsp->print_file = NULL;
4212         fsp->modified = False;
4213         fsp->oplock_type = NO_OPLOCK;
4214         fsp->sent_oplock_break = NO_BREAK_SENT;
4215         fsp->is_directory = True;
4216         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4217                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4218         }
4219         status = fsp_set_smb_fname(fsp, smb_dname);
4220         if (!NT_STATUS_IS_OK(status)) {
4221                 file_free(req, fsp);
4222                 return status;
4223         }
4224
4225         /* Don't store old timestamps for directory
4226            handles in the internal database. We don't
4227            update them in there if new objects
4228            are creaded in the directory. Currently
4229            we only update timestamps on file writes.
4230            See bug #9870.
4231         */
4232         ZERO_STRUCT(mtimespec);
4233
4234         if (access_mask & (FILE_LIST_DIRECTORY|
4235                            FILE_ADD_FILE|
4236                            FILE_ADD_SUBDIRECTORY|
4237                            FILE_TRAVERSE|
4238                            DELETE_ACCESS|
4239                            FILE_DELETE_CHILD)) {
4240 #ifdef O_DIRECTORY
4241                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4242 #else
4243                 /* POSIX allows us to open a directory with O_RDONLY. */
4244                 status = fd_open(conn, fsp, O_RDONLY, 0);
4245 #endif
4246                 if (!NT_STATUS_IS_OK(status)) {
4247                         DEBUG(5, ("open_directory: Could not open fd for "
4248                                 "%s (%s)\n",
4249                                 smb_fname_str_dbg(smb_dname),
4250                                 nt_errstr(status)));
4251                         file_free(req, fsp);
4252                         return status;
4253                 }
4254         } else {
4255                 fsp->fh->fd = -1;
4256                 DEBUG(10, ("Not opening Directory %s\n",
4257                         smb_fname_str_dbg(smb_dname)));
4258         }
4259
4260         status = vfs_stat_fsp(fsp);
4261         if (!NT_STATUS_IS_OK(status)) {
4262                 fd_close(fsp);
4263                 file_free(req, fsp);
4264                 return status;
4265         }
4266
4267         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4268                 DEBUG(5,("open_directory: %s is not a directory !\n",
4269                          smb_fname_str_dbg(smb_dname)));
4270                 fd_close(fsp);
4271                 file_free(req, fsp);
4272                 return NT_STATUS_NOT_A_DIRECTORY;
4273         }
4274
4275         /* Ensure there was no race condition.  We need to check
4276          * dev/inode but not permissions, as these can change
4277          * legitimately */
4278         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4279                 DEBUG(5,("open_directory: stat struct differs for "
4280                         "directory %s.\n",
4281                         smb_fname_str_dbg(smb_dname)));
4282                 fd_close(fsp);
4283                 file_free(req, fsp);
4284                 return NT_STATUS_ACCESS_DENIED;
4285         }
4286
4287         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4288                                   conn->connectpath, smb_dname,
4289                                   &mtimespec);
4290
4291         if (lck == NULL) {
4292                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4293                           "%s\n", smb_fname_str_dbg(smb_dname)));
4294                 fd_close(fsp);
4295                 file_free(req, fsp);
4296                 return NT_STATUS_SHARING_VIOLATION;
4297         }
4298
4299         if (has_delete_on_close(lck, fsp->name_hash)) {
4300                 TALLOC_FREE(lck);
4301                 fd_close(fsp);
4302                 file_free(req, fsp);
4303                 return NT_STATUS_DELETE_PENDING;
4304         }
4305
4306         status = open_mode_check(conn, lck,
4307                                  access_mask, share_access);
4308
4309         if (!NT_STATUS_IS_OK(status)) {
4310                 TALLOC_FREE(lck);
4311                 fd_close(fsp);
4312                 file_free(req, fsp);
4313                 return status;
4314         }
4315
4316         ok = set_share_mode(lck, fsp, get_current_uid(conn),
4317                             req ? req->mid : 0, NO_OPLOCK,
4318                             UINT32_MAX);
4319         if (!ok) {
4320                 TALLOC_FREE(lck);
4321                 fd_close(fsp);
4322                 file_free(req, fsp);
4323                 return NT_STATUS_NO_MEMORY;
4324         }
4325
4326         /* For directories the delete on close bit at open time seems
4327            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4328         if (create_options & FILE_DELETE_ON_CLOSE) {
4329                 status = can_set_delete_on_close(fsp, 0);
4330                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4331                         del_share_mode(lck, fsp);
4332                         TALLOC_FREE(lck);
4333                         fd_close(fsp);
4334                         file_free(req, fsp);
4335                         return status;
4336                 }
4337
4338                 if (NT_STATUS_IS_OK(status)) {
4339                         /* Note that here we set the *initial* delete on close flag,
4340                            not the regular one. The magic gets handled in close. */
4341                         fsp->initial_delete_on_close = True;
4342                 }
4343         }
4344
4345         {
4346                 /*
4347                  * Deal with other opens having a modified write time. Is this
4348                  * possible for directories?
4349                  */
4350                 struct timespec write_time = get_share_mode_write_time(lck);
4351
4352                 if (!null_timespec(write_time)) {
4353                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4354                 }
4355         }
4356
4357         TALLOC_FREE(lck);
4358
4359         if (pinfo) {
4360                 *pinfo = info;
4361         }
4362
4363         *result = fsp;
4364         return NT_STATUS_OK;
4365 }
4366
4367 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4368                           struct smb_filename *smb_dname)
4369 {
4370         NTSTATUS status;
4371         files_struct *fsp;
4372
4373         status = SMB_VFS_CREATE_FILE(
4374                 conn,                                   /* conn */
4375                 req,                                    /* req */
4376                 0,                                      /* root_dir_fid */
4377                 smb_dname,                              /* fname */
4378                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4379                 FILE_SHARE_NONE,                        /* share_access */
4380                 FILE_CREATE,                            /* create_disposition*/
4381                 FILE_DIRECTORY_FILE,                    /* create_options */
4382                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4383                 0,                                      /* oplock_request */
4384                 NULL,                                   /* lease */
4385                 0,                                      /* allocation_size */
4386                 0,                                      /* private_flags */
4387                 NULL,                                   /* sd */
4388                 NULL,                                   /* ea_list */
4389                 &fsp,                                   /* result */
4390                 NULL,                                   /* pinfo */
4391                 NULL, NULL);                            /* create context */
4392
4393         if (NT_STATUS_IS_OK(status)) {
4394                 close_file(req, fsp, NORMAL_CLOSE);
4395         }
4396
4397         return status;
4398 }
4399
4400 /****************************************************************************
4401  Receive notification that one of our open files has been renamed by another
4402  smbd process.
4403 ****************************************************************************/
4404
4405 void msg_file_was_renamed(struct messaging_context *msg,
4406                           void *private_data,
4407                           uint32_t msg_type,
4408                           struct server_id server_id,
4409                           DATA_BLOB *data)
4410 {
4411         files_struct *fsp;
4412         char *frm = (char *)data->data;
4413         struct file_id id;
4414         const char *sharepath;
4415         const char *base_name;
4416         const char *stream_name;
4417         struct smb_filename *smb_fname = NULL;
4418         size_t sp_len, bn_len;
4419         NTSTATUS status;
4420         struct smbd_server_connection *sconn =
4421                 talloc_get_type_abort(private_data,
4422                 struct smbd_server_connection);
4423
4424         if (data->data == NULL
4425             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
4426                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
4427                           (int)data->length));
4428                 return;
4429         }
4430
4431         /* Unpack the message. */
4432         pull_file_id_24(frm, &id);
4433         sharepath = &frm[24];
4434         sp_len = strlen(sharepath);
4435         base_name = sharepath + sp_len + 1;
4436         bn_len = strlen(base_name);
4437         stream_name = sharepath + sp_len + 1 + bn_len + 1;
4438
4439         /* stream_name must always be NULL if there is no stream. */
4440         if (stream_name[0] == '\0') {
4441                 stream_name = NULL;
4442         }
4443
4444         smb_fname = synthetic_smb_fname(talloc_tos(),
4445                                         base_name,
4446                                         stream_name,
4447                                         NULL,
4448                                         0);
4449         if (smb_fname == NULL) {
4450                 return;
4451         }
4452
4453         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
4454                 "file_id %s\n",
4455                 sharepath, smb_fname_str_dbg(smb_fname),
4456                 file_id_string_tos(&id)));
4457
4458         for(fsp = file_find_di_first(sconn, id); fsp;
4459             fsp = file_find_di_next(fsp)) {
4460                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
4461
4462                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
4463                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
4464                                 smb_fname_str_dbg(smb_fname)));
4465                         status = fsp_set_smb_fname(fsp, smb_fname);
4466                         if (!NT_STATUS_IS_OK(status)) {
4467                                 goto out;
4468                         }
4469                 } else {
4470                         /* TODO. JRA. */
4471                         /* Now we have the complete path we can work out if this is
4472                            actually within this share and adjust newname accordingly. */
4473                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
4474                                 "not sharepath %s) "
4475                                 "%s from %s -> %s\n",
4476                                 fsp->conn->connectpath,
4477                                 sharepath,
4478                                 fsp_fnum_dbg(fsp),
4479                                 fsp_str_dbg(fsp),
4480                                 smb_fname_str_dbg(smb_fname)));
4481                 }
4482         }
4483  out:
4484         TALLOC_FREE(smb_fname);
4485         return;
4486 }
4487
4488 /*
4489  * If a main file is opened for delete, all streams need to be checked for
4490  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4491  * If that works, delete them all by setting the delete on close and close.
4492  */
4493
4494 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4495                                         const struct smb_filename *smb_fname)
4496 {
4497         struct stream_struct *stream_info = NULL;
4498         files_struct **streams = NULL;
4499         int i;
4500         unsigned int num_streams = 0;
4501         TALLOC_CTX *frame = talloc_stackframe();
4502         NTSTATUS status;
4503
4504         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4505                                 &num_streams, &stream_info);
4506
4507         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4508             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4509                 DEBUG(10, ("no streams around\n"));
4510                 TALLOC_FREE(frame);
4511                 return NT_STATUS_OK;
4512         }
4513
4514         if (!NT_STATUS_IS_OK(status)) {
4515                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4516                            nt_errstr(status)));
4517                 goto fail;
4518         }
4519
4520         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4521                    num_streams));
4522
4523         if (num_streams == 0) {
4524                 TALLOC_FREE(frame);
4525                 return NT_STATUS_OK;
4526         }
4527
4528         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4529         if (streams == NULL) {
4530                 DEBUG(0, ("talloc failed\n"));
4531                 status = NT_STATUS_NO_MEMORY;
4532                 goto fail;
4533         }
4534
4535         for (i=0; i<num_streams; i++) {
4536                 struct smb_filename *smb_fname_cp;
4537
4538                 if (strequal(stream_info[i].name, "::$DATA")) {
4539                         streams[i] = NULL;
4540                         continue;
4541                 }
4542
4543                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4544                                         smb_fname->base_name,
4545                                         stream_info[i].name,
4546                                         NULL,
4547                                         (smb_fname->flags &
4548                                                 ~SMB_FILENAME_POSIX_PATH));
4549                 if (smb_fname_cp == NULL) {
4550                         status = NT_STATUS_NO_MEMORY;
4551                         goto fail;
4552                 }
4553
4554                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4555                         DEBUG(10, ("Unable to stat stream: %s\n",
4556                                    smb_fname_str_dbg(smb_fname_cp)));
4557                 }
4558
4559                 status = SMB_VFS_CREATE_FILE(
4560                          conn,                  /* conn */
4561                          NULL,                  /* req */
4562                          0,                     /* root_dir_fid */
4563                          smb_fname_cp,          /* fname */
4564                          DELETE_ACCESS,         /* access_mask */
4565                          (FILE_SHARE_READ |     /* share_access */
4566                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4567                          FILE_OPEN,             /* create_disposition*/
4568                          0,                     /* create_options */
4569                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4570                          0,                     /* oplock_request */
4571                          NULL,                  /* lease */
4572                          0,                     /* allocation_size */
4573                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4574                          NULL,                  /* sd */
4575                          NULL,                  /* ea_list */
4576                          &streams[i],           /* result */
4577                          NULL,                  /* pinfo */
4578                          NULL, NULL);           /* create context */
4579
4580                 if (!NT_STATUS_IS_OK(status)) {
4581                         DEBUG(10, ("Could not open stream %s: %s\n",
4582                                    smb_fname_str_dbg(smb_fname_cp),
4583                                    nt_errstr(status)));
4584
4585                         TALLOC_FREE(smb_fname_cp);
4586                         break;
4587                 }
4588                 TALLOC_FREE(smb_fname_cp);
4589         }
4590
4591         /*
4592          * don't touch the variable "status" beyond this point :-)
4593          */
4594
4595         for (i -= 1 ; i >= 0; i--) {
4596                 if (streams[i] == NULL) {
4597                         continue;
4598                 }
4599
4600                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4601                            fsp_str_dbg(streams[i])));
4602                 close_file(NULL, streams[i], NORMAL_CLOSE);
4603         }
4604
4605  fail:
4606         TALLOC_FREE(frame);
4607         return status;
4608 }
4609
4610 /*********************************************************************
4611  Create a default ACL by inheriting from the parent. If no inheritance
4612  from the parent available, don't set anything. This will leave the actual
4613  permissions the new file or directory already got from the filesystem
4614  as the NT ACL when read.
4615 *********************************************************************/
4616
4617 static NTSTATUS inherit_new_acl(files_struct *fsp)
4618 {
4619         TALLOC_CTX *frame = talloc_stackframe();
4620         char *parent_name = NULL;
4621         struct security_descriptor *parent_desc = NULL;
4622         NTSTATUS status = NT_STATUS_OK;
4623         struct security_descriptor *psd = NULL;
4624         const struct dom_sid *owner_sid = NULL;
4625         const struct dom_sid *group_sid = NULL;
4626         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4627         struct security_token *token = fsp->conn->session_info->security_token;
4628         bool inherit_owner =
4629             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4630         bool inheritable_components = false;
4631         bool try_builtin_administrators = false;
4632         const struct dom_sid *BA_U_sid = NULL;
4633         const struct dom_sid *BA_G_sid = NULL;
4634         bool try_system = false;
4635         const struct dom_sid *SY_U_sid = NULL;
4636         const struct dom_sid *SY_G_sid = NULL;
4637         size_t size = 0;
4638         struct smb_filename *parent_smb_fname = NULL;
4639
4640         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4641                 TALLOC_FREE(frame);
4642                 return NT_STATUS_NO_MEMORY;
4643         }
4644         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4645                                                 parent_name,
4646                                                 NULL,
4647                                                 NULL,
4648                                                 fsp->fsp_name->flags);
4649
4650         if (parent_smb_fname == NULL) {
4651                 TALLOC_FREE(frame);
4652                 return NT_STATUS_NO_MEMORY;
4653         }
4654
4655         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4656                                     parent_smb_fname,
4657                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4658                                     frame,
4659                                     &parent_desc);
4660         if (!NT_STATUS_IS_OK(status)) {
4661                 TALLOC_FREE(frame);
4662                 return status;
4663         }
4664
4665         inheritable_components = sd_has_inheritable_components(parent_desc,
4666                                         fsp->is_directory);
4667
4668         if (!inheritable_components && !inherit_owner) {
4669                 TALLOC_FREE(frame);
4670                 /* Nothing to inherit and not setting owner. */
4671                 return NT_STATUS_OK;
4672         }
4673
4674         /* Create an inherited descriptor from the parent. */
4675
4676         if (DEBUGLEVEL >= 10) {
4677                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4678                         fsp_str_dbg(fsp) ));
4679                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4680         }
4681
4682         /* Inherit from parent descriptor if "inherit owner" set. */
4683         if (inherit_owner) {
4684                 owner_sid = parent_desc->owner_sid;
4685                 group_sid = parent_desc->group_sid;
4686         }
4687
4688         if (owner_sid == NULL) {
4689                 if (security_token_has_builtin_administrators(token)) {
4690                         try_builtin_administrators = true;
4691                 } else if (security_token_is_system(token)) {
4692                         try_builtin_administrators = true;
4693                         try_system = true;
4694                 }
4695         }
4696
4697         if (group_sid == NULL &&
4698             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4699         {
4700                 if (security_token_is_system(token)) {
4701                         try_builtin_administrators = true;
4702                         try_system = true;
4703                 }
4704         }
4705
4706         if (try_builtin_administrators) {
4707                 struct unixid ids;
4708                 bool ok;
4709
4710                 ZERO_STRUCT(ids);
4711                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4712                 if (ok) {
4713                         switch (ids.type) {
4714                         case ID_TYPE_BOTH:
4715                                 BA_U_sid = &global_sid_Builtin_Administrators;
4716                                 BA_G_sid = &global_sid_Builtin_Administrators;
4717                                 break;
4718                         case ID_TYPE_UID:
4719                                 BA_U_sid = &global_sid_Builtin_Administrators;
4720                                 break;
4721                         case ID_TYPE_GID:
4722                                 BA_G_sid = &global_sid_Builtin_Administrators;
4723                                 break;
4724                         default:
4725                                 break;
4726                         }
4727                 }
4728         }
4729
4730         if (try_system) {
4731                 struct unixid ids;
4732                 bool ok;
4733
4734                 ZERO_STRUCT(ids);
4735                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4736                 if (ok) {
4737                         switch (ids.type) {
4738                         case ID_TYPE_BOTH:
4739                                 SY_U_sid = &global_sid_System;
4740                                 SY_G_sid = &global_sid_System;
4741                                 break;
4742                         case ID_TYPE_UID:
4743                                 SY_U_sid = &global_sid_System;
4744                                 break;
4745                         case ID_TYPE_GID:
4746                                 SY_G_sid = &global_sid_System;
4747                                 break;
4748                         default:
4749                                 break;
4750                         }
4751                 }
4752         }
4753
4754         if (owner_sid == NULL) {
4755                 owner_sid = BA_U_sid;
4756         }
4757
4758         if (owner_sid == NULL) {
4759                 owner_sid = SY_U_sid;
4760         }
4761
4762         if (group_sid == NULL) {
4763                 group_sid = SY_G_sid;
4764         }
4765
4766         if (try_system && group_sid == NULL) {
4767                 group_sid = BA_G_sid;
4768         }
4769
4770         if (owner_sid == NULL) {
4771                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4772         }
4773         if (group_sid == NULL) {
4774                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4775                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4776                 } else {
4777                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4778                 }
4779         }
4780
4781         status = se_create_child_secdesc(frame,
4782                         &psd,
4783                         &size,
4784                         parent_desc,
4785                         owner_sid,
4786                         group_sid,
4787                         fsp->is_directory);
4788         if (!NT_STATUS_IS_OK(status)) {
4789                 TALLOC_FREE(frame);
4790                 return status;
4791         }
4792
4793         /* If inheritable_components == false,
4794            se_create_child_secdesc()
4795            creates a security descriptor with a NULL dacl
4796            entry, but with SEC_DESC_DACL_PRESENT. We need
4797            to remove that flag. */
4798
4799         if (!inheritable_components) {
4800                 security_info_sent &= ~SECINFO_DACL;
4801                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4802         }
4803
4804         if (DEBUGLEVEL >= 10) {
4805                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4806                         fsp_str_dbg(fsp) ));
4807                 NDR_PRINT_DEBUG(security_descriptor, psd);
4808         }
4809
4810         if (inherit_owner) {
4811                 /* We need to be root to force this. */
4812                 become_root();
4813         }
4814         status = SMB_VFS_FSET_NT_ACL(fsp,
4815                         security_info_sent,
4816                         psd);
4817         if (inherit_owner) {
4818                 unbecome_root();
4819         }
4820         TALLOC_FREE(frame);
4821         return status;
4822 }
4823
4824 /*
4825  * If we already have a lease, it must match the new file id. [MS-SMB2]
4826  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4827  * used for a different file name.
4828  */
4829
4830 struct lease_match_state {
4831         /* Input parameters. */
4832         TALLOC_CTX *mem_ctx;
4833         const char *servicepath;
4834         const struct smb_filename *fname;
4835         bool file_existed;
4836         struct file_id id;
4837         /* Return parameters. */
4838         uint32_t num_file_ids;
4839         struct file_id *ids;
4840         NTSTATUS match_status;
4841 };
4842
4843 /*************************************************************
4844  File doesn't exist but this lease key+guid is already in use.
4845
4846  This is only allowable in the dynamic share case where the
4847  service path must be different.
4848
4849  There is a small race condition here in the multi-connection
4850  case where a client sends two create calls on different connections,
4851  where the file doesn't exist and one smbd creates the leases_db
4852  entry first, but this will get fixed by the multichannel cleanup
4853  when all identical client_guids get handled by a single smbd.
4854 **************************************************************/
4855
4856 static void lease_match_parser_new_file(
4857         uint32_t num_files,
4858         const struct leases_db_file *files,
4859         struct lease_match_state *state)
4860 {
4861         uint32_t i;
4862
4863         for (i = 0; i < num_files; i++) {
4864                 const struct leases_db_file *f = &files[i];
4865                 if (strequal(state->servicepath, f->servicepath)) {
4866                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4867                         return;
4868                 }
4869         }
4870
4871         /* Dynamic share case. Break leases on all other files. */
4872         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4873                                         num_files,
4874                                         files,
4875                                         &state->ids);
4876         if (!NT_STATUS_IS_OK(state->match_status)) {
4877                 return;
4878         }
4879
4880         state->num_file_ids = num_files;
4881         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4882         return;
4883 }
4884
4885 static void lease_match_parser(
4886         uint32_t num_files,
4887         const struct leases_db_file *files,
4888         void *private_data)
4889 {
4890         struct lease_match_state *state =
4891                 (struct lease_match_state *)private_data;
4892         uint32_t i;
4893
4894         if (!state->file_existed) {
4895                 /*
4896                  * Deal with name mismatch or
4897                  * possible dynamic share case separately
4898                  * to make code clearer.
4899                  */
4900                 lease_match_parser_new_file(num_files,
4901                                                 files,
4902                                                 state);
4903                 return;
4904         }
4905
4906         /* File existed. */
4907         state->match_status = NT_STATUS_OK;
4908
4909         for (i = 0; i < num_files; i++) {
4910                 const struct leases_db_file *f = &files[i];
4911
4912                 /* Everything should be the same. */
4913                 if (!file_id_equal(&state->id, &f->id)) {
4914                         /* This should catch all dynamic share cases. */
4915                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4916                         break;
4917                 }
4918                 if (!strequal(f->servicepath, state->servicepath)) {
4919                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4920                         break;
4921                 }
4922                 if (!strequal(f->base_name, state->fname->base_name)) {
4923                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4924                         break;
4925                 }
4926                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4927                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4928                         break;
4929                 }
4930         }
4931
4932         if (NT_STATUS_IS_OK(state->match_status)) {
4933                 /*
4934                  * Common case - just opening another handle on a
4935                  * file on a non-dynamic share.
4936                  */
4937                 return;
4938         }
4939
4940         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4941                 /* Mismatched path. Error back to client. */
4942                 return;
4943         }
4944
4945         /*
4946          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4947          * Don't allow leases.
4948          */
4949
4950         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4951                                         num_files,
4952                                         files,
4953                                         &state->ids);
4954         if (!NT_STATUS_IS_OK(state->match_status)) {
4955                 return;
4956         }
4957
4958         state->num_file_ids = num_files;
4959         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4960         return;
4961 }
4962
4963 static NTSTATUS lease_match(connection_struct *conn,
4964                             struct smb_request *req,
4965                             struct smb2_lease_key *lease_key,
4966                             const char *servicepath,
4967                             const struct smb_filename *fname,
4968                             uint16_t *p_version,
4969                             uint16_t *p_epoch)
4970 {
4971         struct smbd_server_connection *sconn = req->sconn;
4972         TALLOC_CTX *tos = talloc_tos();
4973         struct lease_match_state state = {
4974                 .mem_ctx = tos,
4975                 .servicepath = servicepath,
4976                 .fname = fname,
4977                 .match_status = NT_STATUS_OK
4978         };
4979         uint32_t i;
4980         NTSTATUS status;
4981
4982         state.file_existed = VALID_STAT(fname->st);
4983         if (state.file_existed) {
4984                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
4985         }
4986
4987         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
4988                                  lease_key, lease_match_parser, &state);
4989         if (!NT_STATUS_IS_OK(status)) {
4990                 /*
4991                  * Not found or error means okay: We can make the lease pass
4992                  */
4993                 return NT_STATUS_OK;
4994         }
4995         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
4996                 /*
4997                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
4998                  * deal with it.
4999                  */
5000                 return state.match_status;
5001         }
5002
5003         /* We have to break all existing leases. */
5004         for (i = 0; i < state.num_file_ids; i++) {
5005                 struct share_mode_lock *lck;
5006                 struct share_mode_data *d;
5007                 uint32_t j;
5008
5009                 if (file_id_equal(&state.ids[i], &state.id)) {
5010                         /* Don't need to break our own file. */
5011                         continue;
5012                 }
5013
5014                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
5015                 if (lck == NULL) {
5016                         /* Race condition - file already closed. */
5017                         continue;
5018                 }
5019                 d = lck->data;
5020                 for (j=0; j<d->num_share_modes; j++) {
5021                         struct share_mode_entry *e = &d->share_modes[j];
5022                         uint32_t e_lease_type = get_lease_type(d, e);
5023
5024                         if (share_mode_stale_pid(d, j)) {
5025                                 continue;
5026                         }
5027
5028                         if (e->op_type == LEASE_OPLOCK) {
5029                                 struct share_mode_lease *l = NULL;
5030                                 l = &lck->data->leases[e->lease_idx];
5031                                 if (!smb2_lease_key_equal(&l->lease_key,
5032                                                           lease_key)) {
5033                                         continue;
5034                                 }
5035                                 *p_epoch = l->epoch;
5036                                 *p_version = l->lease_version;
5037                         }
5038
5039                         if (e_lease_type == SMB2_LEASE_NONE) {
5040                                 continue;
5041                         }
5042
5043                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
5044                                            SMB2_LEASE_NONE);
5045
5046                         /*
5047                          * Windows 7 and 8 lease clients
5048                          * are broken in that they will not
5049                          * respond to lease break requests
5050                          * whilst waiting for an outstanding
5051                          * open request on that lease handle
5052                          * on the same TCP connection, due
5053                          * to holding an internal inode lock.
5054                          *
5055                          * This means we can't reschedule
5056                          * ourselves here, but must return
5057                          * from the create.
5058                          *
5059                          * Work around:
5060                          *
5061                          * Send the breaks and then return
5062                          * SMB2_LEASE_NONE in the lease handle
5063                          * to cause them to acknowledge the
5064                          * lease break. Consultation with
5065                          * Microsoft engineering confirmed
5066                          * this approach is safe.
5067                          */
5068
5069                 }
5070                 TALLOC_FREE(lck);
5071         }
5072         /*
5073          * Ensure we don't grant anything more so we
5074          * never upgrade.
5075          */
5076         return NT_STATUS_OPLOCK_NOT_GRANTED;
5077 }
5078
5079 /*
5080  * Wrapper around open_file_ntcreate and open_directory
5081  */
5082
5083 static NTSTATUS create_file_unixpath(connection_struct *conn,
5084                                      struct smb_request *req,
5085                                      struct smb_filename *smb_fname,
5086                                      uint32_t access_mask,
5087                                      uint32_t share_access,
5088                                      uint32_t create_disposition,
5089                                      uint32_t create_options,
5090                                      uint32_t file_attributes,
5091                                      uint32_t oplock_request,
5092                                      struct smb2_lease *lease,
5093                                      uint64_t allocation_size,
5094                                      uint32_t private_flags,
5095                                      struct security_descriptor *sd,
5096                                      struct ea_list *ea_list,
5097
5098                                      files_struct **result,
5099                                      int *pinfo)
5100 {
5101         int info = FILE_WAS_OPENED;
5102         files_struct *base_fsp = NULL;
5103         files_struct *fsp = NULL;
5104         NTSTATUS status;
5105
5106         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5107                   "file_attributes = 0x%x, share_access = 0x%x, "
5108                   "create_disposition = 0x%x create_options = 0x%x "
5109                   "oplock_request = 0x%x private_flags = 0x%x "
5110                   "ea_list = %p, sd = %p, "
5111                   "fname = %s\n",
5112                   (unsigned int)access_mask,
5113                   (unsigned int)file_attributes,
5114                   (unsigned int)share_access,
5115                   (unsigned int)create_disposition,
5116                   (unsigned int)create_options,
5117                   (unsigned int)oplock_request,
5118                   (unsigned int)private_flags,
5119                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5120
5121         if (create_options & FILE_OPEN_BY_FILE_ID) {
5122                 status = NT_STATUS_NOT_SUPPORTED;
5123                 goto fail;
5124         }
5125
5126         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5127                 status = NT_STATUS_INVALID_PARAMETER;
5128                 goto fail;
5129         }
5130
5131         if (req == NULL) {
5132                 oplock_request |= INTERNAL_OPEN_ONLY;
5133         }
5134
5135         if (lease != NULL) {
5136                 uint16_t epoch = lease->lease_epoch;
5137                 uint16_t version = lease->lease_version;
5138
5139                 if (req == NULL) {
5140                         DBG_WARNING("Got lease on internal open\n");
5141                         status = NT_STATUS_INTERNAL_ERROR;
5142                         goto fail;
5143                 }
5144
5145                 status = lease_match(conn,
5146                                 req,
5147                                 &lease->lease_key,
5148                                 conn->connectpath,
5149                                 smb_fname,
5150                                 &version,
5151                                 &epoch);
5152                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5153                         /* Dynamic share file. No leases and update epoch... */
5154                         lease->lease_state = SMB2_LEASE_NONE;
5155                         lease->lease_epoch = epoch;
5156                         lease->lease_version = version;
5157                 } else if (!NT_STATUS_IS_OK(status)) {
5158                         goto fail;
5159                 }
5160         }
5161
5162         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5163             && (access_mask & DELETE_ACCESS)
5164             && !is_ntfs_stream_smb_fname(smb_fname)) {
5165                 /*
5166                  * We can't open a file with DELETE access if any of the
5167                  * streams is open without FILE_SHARE_DELETE
5168                  */
5169                 status = open_streams_for_delete(conn, smb_fname);
5170
5171                 if (!NT_STATUS_IS_OK(status)) {
5172                         goto fail;
5173                 }
5174         }
5175
5176         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5177                         !security_token_has_privilege(get_current_nttok(conn),
5178                                         SEC_PRIV_SECURITY)) {
5179                 DEBUG(10, ("create_file_unixpath: open on %s "
5180                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5181                         smb_fname_str_dbg(smb_fname)));
5182                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5183                 goto fail;
5184         }
5185
5186         /*
5187          * Files or directories can't be opened DELETE_ON_CLOSE without
5188          * delete access.
5189          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5190          */
5191         if (create_options & FILE_DELETE_ON_CLOSE) {
5192                 if ((access_mask & DELETE_ACCESS) == 0) {
5193                         status = NT_STATUS_INVALID_PARAMETER;
5194                         goto fail;
5195                 }
5196         }
5197
5198         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5199             && is_ntfs_stream_smb_fname(smb_fname)
5200             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5201                 uint32_t base_create_disposition;
5202                 struct smb_filename *smb_fname_base = NULL;
5203                 uint32_t base_privflags;
5204
5205                 if (create_options & FILE_DIRECTORY_FILE) {
5206                         status = NT_STATUS_NOT_A_DIRECTORY;
5207                         goto fail;
5208                 }
5209
5210                 switch (create_disposition) {
5211                 case FILE_OPEN:
5212                         base_create_disposition = FILE_OPEN;
5213                         break;
5214                 default:
5215                         base_create_disposition = FILE_OPEN_IF;
5216                         break;
5217                 }
5218
5219                 /* Create an smb_filename with stream_name == NULL. */
5220                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5221                                                 smb_fname->base_name,
5222                                                 NULL,
5223                                                 NULL,
5224                                                 smb_fname->flags);
5225                 if (smb_fname_base == NULL) {
5226                         status = NT_STATUS_NO_MEMORY;
5227                         goto fail;
5228                 }
5229
5230                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5231                         DEBUG(10, ("Unable to stat stream: %s\n",
5232                                    smb_fname_str_dbg(smb_fname_base)));
5233                 } else {
5234                         /*
5235                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5236                          * We need to check if the requested access mask
5237                          * could be used to open the underlying file (if
5238                          * it existed), as we're passing in zero for the
5239                          * access mask to the base filename.
5240                          */
5241                         status = check_base_file_access(conn,
5242                                                         smb_fname_base,
5243                                                         access_mask);
5244
5245                         if (!NT_STATUS_IS_OK(status)) {
5246                                 DEBUG(10, ("Permission check "
5247                                         "for base %s failed: "
5248                                         "%s\n", smb_fname->base_name,
5249                                         nt_errstr(status)));
5250                                 goto fail;
5251                         }
5252                 }
5253
5254                 base_privflags = NTCREATEX_OPTIONS_PRIVATE_STREAM_BASEOPEN;
5255
5256                 /* Open the base file. */
5257                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5258                                               FILE_SHARE_READ
5259                                               | FILE_SHARE_WRITE
5260                                               | FILE_SHARE_DELETE,
5261                                               base_create_disposition,
5262                                               0, 0, 0, NULL, 0,
5263                                               base_privflags,
5264                                               NULL, NULL,
5265                                               &base_fsp, NULL);
5266                 TALLOC_FREE(smb_fname_base);
5267
5268                 if (!NT_STATUS_IS_OK(status)) {
5269                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5270                                    "%s\n", smb_fname->base_name,
5271                                    nt_errstr(status)));
5272                         goto fail;
5273                 }
5274                 /* we don't need the low level fd */
5275                 fd_close(base_fsp);
5276         }
5277
5278         /*
5279          * If it's a request for a directory open, deal with it separately.
5280          */
5281
5282         if (create_options & FILE_DIRECTORY_FILE) {
5283
5284                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5285                         status = NT_STATUS_INVALID_PARAMETER;
5286                         goto fail;
5287                 }
5288
5289                 /* Can't open a temp directory. IFS kit test. */
5290                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5291                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5292                         status = NT_STATUS_INVALID_PARAMETER;
5293                         goto fail;
5294                 }
5295
5296                 /*
5297                  * We will get a create directory here if the Win32
5298                  * app specified a security descriptor in the
5299                  * CreateDirectory() call.
5300                  */
5301
5302                 oplock_request = 0;
5303                 status = open_directory(
5304                         conn, req, smb_fname, access_mask, share_access,
5305                         create_disposition, create_options, file_attributes,
5306                         &info, &fsp);
5307         } else {
5308
5309                 /*
5310                  * Ordinary file case.
5311                  */
5312
5313                 status = file_new(req, conn, &fsp);
5314                 if(!NT_STATUS_IS_OK(status)) {
5315                         goto fail;
5316                 }
5317
5318                 status = fsp_set_smb_fname(fsp, smb_fname);
5319                 if (!NT_STATUS_IS_OK(status)) {
5320                         goto fail;
5321                 }
5322
5323                 if (base_fsp) {
5324                         /*
5325                          * We're opening the stream element of a
5326                          * base_fsp we already opened. Set up the
5327                          * base_fsp pointer.
5328                          */
5329                         fsp->base_fsp = base_fsp;
5330                 }
5331
5332                 if (allocation_size) {
5333                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5334                                                         allocation_size);
5335                 }
5336
5337                 status = open_file_ntcreate(conn,
5338                                             req,
5339                                             access_mask,
5340                                             share_access,
5341                                             create_disposition,
5342                                             create_options,
5343                                             file_attributes,
5344                                             oplock_request,
5345                                             lease,
5346                                             private_flags,
5347                                             &info,
5348                                             fsp);
5349
5350                 if(!NT_STATUS_IS_OK(status)) {
5351                         file_free(req, fsp);
5352                         fsp = NULL;
5353                 }
5354
5355                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5356
5357                         /* A stream open never opens a directory */
5358
5359                         if (base_fsp) {
5360                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5361                                 goto fail;
5362                         }
5363
5364                         /*
5365                          * Fail the open if it was explicitly a non-directory
5366                          * file.
5367                          */
5368
5369                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5370                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5371                                 goto fail;
5372                         }
5373
5374                         oplock_request = 0;
5375                         status = open_directory(
5376                                 conn, req, smb_fname, access_mask,
5377                                 share_access, create_disposition,
5378                                 create_options, file_attributes,
5379                                 &info, &fsp);
5380                 }
5381         }
5382
5383         if (!NT_STATUS_IS_OK(status)) {
5384                 goto fail;
5385         }
5386
5387         fsp->base_fsp = base_fsp;
5388
5389         if ((ea_list != NULL) &&
5390             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5391                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5392                 if (!NT_STATUS_IS_OK(status)) {
5393                         goto fail;
5394                 }
5395         }
5396
5397         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5398                 status = NT_STATUS_ACCESS_DENIED;
5399                 goto fail;
5400         }
5401
5402         /* Save the requested allocation size. */
5403         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5404                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5405                     && !(fsp->is_directory))
5406                 {
5407                         fsp->initial_allocation_size = smb_roundup(
5408                                 fsp->conn, allocation_size);
5409                         if (vfs_allocate_file_space(
5410                                     fsp, fsp->initial_allocation_size) == -1) {
5411                                 status = NT_STATUS_DISK_FULL;
5412                                 goto fail;
5413                         }
5414                 } else {
5415                         fsp->initial_allocation_size = smb_roundup(
5416                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5417                 }
5418         } else {
5419                 fsp->initial_allocation_size = 0;
5420         }
5421
5422         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5423                                 fsp->base_fsp == NULL) {
5424                 if (sd != NULL) {
5425                         /*
5426                          * According to the MS documentation, the only time the security
5427                          * descriptor is applied to the opened file is iff we *created* the
5428                          * file; an existing file stays the same.
5429                          *
5430                          * Also, it seems (from observation) that you can open the file with
5431                          * any access mask but you can still write the sd. We need to override
5432                          * the granted access before we call set_sd
5433                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5434                          */
5435
5436                         uint32_t sec_info_sent;
5437                         uint32_t saved_access_mask = fsp->access_mask;
5438
5439                         sec_info_sent = get_sec_info(sd);
5440
5441                         fsp->access_mask = FILE_GENERIC_ALL;
5442
5443                         if (sec_info_sent & (SECINFO_OWNER|
5444                                                 SECINFO_GROUP|
5445                                                 SECINFO_DACL|
5446                                                 SECINFO_SACL)) {
5447                                 status = set_sd(fsp, sd, sec_info_sent);
5448                         }
5449
5450                         fsp->access_mask = saved_access_mask;
5451
5452                         if (!NT_STATUS_IS_OK(status)) {
5453                                 goto fail;
5454                         }
5455                 } else if (lp_inherit_acls(SNUM(conn))) {
5456                         /* Inherit from parent. Errors here are not fatal. */
5457                         status = inherit_new_acl(fsp);
5458                         if (!NT_STATUS_IS_OK(status)) {
5459                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5460                                         fsp_str_dbg(fsp),
5461                                         nt_errstr(status) ));
5462                         }
5463                 }
5464         }
5465
5466         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5467          && (create_options & FILE_NO_COMPRESSION)
5468          && (info == FILE_WAS_CREATED)) {
5469                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5470                                                  COMPRESSION_FORMAT_NONE);
5471                 if (!NT_STATUS_IS_OK(status)) {
5472                         DEBUG(1, ("failed to disable compression: %s\n",
5473                                   nt_errstr(status)));
5474                 }
5475         }
5476
5477         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5478
5479         *result = fsp;
5480         if (pinfo != NULL) {
5481                 *pinfo = info;
5482         }
5483
5484         smb_fname->st = fsp->fsp_name->st;
5485
5486         return NT_STATUS_OK;
5487
5488  fail:
5489         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5490
5491         if (fsp != NULL) {
5492                 if (base_fsp && fsp->base_fsp == base_fsp) {
5493                         /*
5494                          * The close_file below will close
5495                          * fsp->base_fsp.
5496                          */
5497                         base_fsp = NULL;
5498                 }
5499                 close_file(req, fsp, ERROR_CLOSE);
5500                 fsp = NULL;
5501         }
5502         if (base_fsp != NULL) {
5503                 close_file(req, base_fsp, ERROR_CLOSE);
5504                 base_fsp = NULL;
5505         }
5506         return status;
5507 }
5508
5509 /*
5510  * Calculate the full path name given a relative fid.
5511  */
5512 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5513                                    struct smb_request *req,
5514                                    uint16_t root_dir_fid,
5515                                    const struct smb_filename *smb_fname,
5516                                    struct smb_filename **smb_fname_out)
5517 {
5518         files_struct *dir_fsp;
5519         char *parent_fname = NULL;
5520         char *new_base_name = NULL;
5521         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5522         NTSTATUS status;
5523
5524         if (root_dir_fid == 0 || !smb_fname) {
5525                 status = NT_STATUS_INTERNAL_ERROR;
5526                 goto out;
5527         }
5528
5529         dir_fsp = file_fsp(req, root_dir_fid);
5530
5531         if (dir_fsp == NULL) {
5532                 status = NT_STATUS_INVALID_HANDLE;
5533                 goto out;
5534         }
5535
5536         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5537                 status = NT_STATUS_INVALID_HANDLE;
5538                 goto out;
5539         }
5540
5541         if (!dir_fsp->is_directory) {
5542
5543                 /*
5544                  * Check to see if this is a mac fork of some kind.
5545                  */
5546
5547                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5548                     is_ntfs_stream_smb_fname(smb_fname)) {
5549                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5550                         goto out;
5551                 }
5552
5553                 /*
5554                   we need to handle the case when we get a
5555                   relative open relative to a file and the
5556                   pathname is blank - this is a reopen!
5557                   (hint from demyn plantenberg)
5558                 */
5559
5560                 status = NT_STATUS_INVALID_HANDLE;
5561                 goto out;
5562         }
5563
5564         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5565                 /*
5566                  * We're at the toplevel dir, the final file name
5567                  * must not contain ./, as this is filtered out
5568                  * normally by srvstr_get_path and unix_convert
5569                  * explicitly rejects paths containing ./.
5570                  */
5571                 parent_fname = talloc_strdup(talloc_tos(), "");
5572                 if (parent_fname == NULL) {
5573                         status = NT_STATUS_NO_MEMORY;
5574                         goto out;
5575                 }
5576         } else {
5577                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5578
5579                 /*
5580                  * Copy in the base directory name.
5581                  */
5582
5583                 parent_fname = talloc_array(talloc_tos(), char,
5584                     dir_name_len+2);
5585                 if (parent_fname == NULL) {
5586                         status = NT_STATUS_NO_MEMORY;
5587                         goto out;
5588                 }
5589                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5590                     dir_name_len+1);
5591
5592                 /*
5593                  * Ensure it ends in a '/'.
5594                  * We used TALLOC_SIZE +2 to add space for the '/'.
5595                  */
5596
5597                 if(dir_name_len
5598                     && (parent_fname[dir_name_len-1] != '\\')
5599                     && (parent_fname[dir_name_len-1] != '/')) {
5600                         parent_fname[dir_name_len] = '/';
5601                         parent_fname[dir_name_len+1] = '\0';
5602                 }
5603         }
5604
5605         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5606                                         smb_fname->base_name);
5607         if (new_base_name == NULL) {
5608                 status = NT_STATUS_NO_MEMORY;
5609                 goto out;
5610         }
5611
5612         status = filename_convert(req,
5613                                 conn,
5614                                 new_base_name,
5615                                 ucf_flags,
5616                                 NULL,
5617                                 NULL,
5618                                 smb_fname_out);
5619         if (!NT_STATUS_IS_OK(status)) {
5620                 goto out;
5621         }
5622
5623  out:
5624         TALLOC_FREE(parent_fname);
5625         TALLOC_FREE(new_base_name);
5626         return status;
5627 }
5628
5629 NTSTATUS create_file_default(connection_struct *conn,
5630                              struct smb_request *req,
5631                              uint16_t root_dir_fid,
5632                              struct smb_filename *smb_fname,
5633                              uint32_t access_mask,
5634                              uint32_t share_access,
5635                              uint32_t create_disposition,
5636                              uint32_t create_options,
5637                              uint32_t file_attributes,
5638                              uint32_t oplock_request,
5639                              struct smb2_lease *lease,
5640                              uint64_t allocation_size,
5641                              uint32_t private_flags,
5642                              struct security_descriptor *sd,
5643                              struct ea_list *ea_list,
5644                              files_struct **result,
5645                              int *pinfo,
5646                              const struct smb2_create_blobs *in_context_blobs,
5647                              struct smb2_create_blobs *out_context_blobs)
5648 {
5649         int info = FILE_WAS_OPENED;
5650         files_struct *fsp = NULL;
5651         NTSTATUS status;
5652         bool stream_name = false;
5653
5654         DBG_DEBUG("create_file: access_mask = 0x%x "
5655                   "file_attributes = 0x%x, share_access = 0x%x, "
5656                   "create_disposition = 0x%x create_options = 0x%x "
5657                   "oplock_request = 0x%x "
5658                   "private_flags = 0x%x "
5659                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5660                   "fname = %s\n",
5661                   (unsigned int)access_mask,
5662                   (unsigned int)file_attributes,
5663                   (unsigned int)share_access,
5664                   (unsigned int)create_disposition,
5665                   (unsigned int)create_options,
5666                   (unsigned int)oplock_request,
5667                   (unsigned int)private_flags,
5668                   (unsigned int)root_dir_fid,
5669                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5670
5671         /*
5672          * Calculate the filename from the root_dir_if if necessary.
5673          */
5674
5675         if (root_dir_fid != 0) {
5676                 struct smb_filename *smb_fname_out = NULL;
5677                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5678                                                    smb_fname, &smb_fname_out);
5679                 if (!NT_STATUS_IS_OK(status)) {
5680                         goto fail;
5681                 }
5682                 smb_fname = smb_fname_out;
5683         }
5684
5685         /*
5686          * Check to see if this is a mac fork of some kind.
5687          */
5688
5689         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5690         if (stream_name) {
5691                 enum FAKE_FILE_TYPE fake_file_type;
5692
5693                 fake_file_type = is_fake_file(smb_fname);
5694
5695                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5696
5697                         /*
5698                          * Here we go! support for changing the disk quotas
5699                          * --metze
5700                          *
5701                          * We need to fake up to open this MAGIC QUOTA file
5702                          * and return a valid FID.
5703                          *
5704                          * w2k close this file directly after openening xp
5705                          * also tries a QUERY_FILE_INFO on the file and then
5706                          * close it
5707                          */
5708                         status = open_fake_file(req, conn, req->vuid,
5709                                                 fake_file_type, smb_fname,
5710                                                 access_mask, &fsp);
5711                         if (!NT_STATUS_IS_OK(status)) {
5712                                 goto fail;
5713                         }
5714
5715                         ZERO_STRUCT(smb_fname->st);
5716                         goto done;
5717                 }
5718
5719                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5720                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5721                         goto fail;
5722                 }
5723         }
5724
5725         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5726                 int ret;
5727                 smb_fname->stream_name = NULL;
5728                 /* We have to handle this error here. */
5729                 if (create_options & FILE_DIRECTORY_FILE) {
5730                         status = NT_STATUS_NOT_A_DIRECTORY;
5731                         goto fail;
5732                 }
5733                 if (req != NULL && req->posix_pathnames) {
5734                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5735                 } else {
5736                         ret = SMB_VFS_STAT(conn, smb_fname);
5737                 }
5738
5739                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5740                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5741                         goto fail;
5742                 }
5743         }
5744
5745         status = create_file_unixpath(
5746                 conn, req, smb_fname, access_mask, share_access,
5747                 create_disposition, create_options, file_attributes,
5748                 oplock_request, lease, allocation_size, private_flags,
5749                 sd, ea_list,
5750                 &fsp, &info);
5751
5752         if (!NT_STATUS_IS_OK(status)) {
5753                 goto fail;
5754         }
5755
5756  done:
5757         DEBUG(10, ("create_file: info=%d\n", info));
5758
5759         *result = fsp;
5760         if (pinfo != NULL) {
5761                 *pinfo = info;
5762         }
5763         return NT_STATUS_OK;
5764
5765  fail:
5766         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5767
5768         if (fsp != NULL) {
5769                 close_file(req, fsp, ERROR_CLOSE);
5770                 fsp = NULL;
5771         }
5772         return status;
5773 }