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                 uint32_t e_lease_type = get_lease_type(d, e);
1867                 uint32_t break_to;
1868                 uint32_t delay_mask = 0;
1869                 bool lease_is_breaking = false;
1870
1871                 if (e_is_lease) {
1872                         NTSTATUS status;
1873
1874                         status = leases_db_get(
1875                                 &e->client_guid,
1876                                 &e->lease_key,
1877                                 &fsp->file_id,
1878                                 NULL, /* current_state */
1879                                 &lease_is_breaking,
1880                                 NULL, /* breaking_to_requested */
1881                                 NULL, /* breaking_to_required */
1882                                 NULL, /* lease_version */
1883                                 NULL); /* epoch */
1884                         SMB_ASSERT(NT_STATUS_IS_OK(status));
1885                 }
1886
1887                 if (have_sharing_violation) {
1888                         delay_mask = SMB2_LEASE_HANDLE;
1889                 } else {
1890                         delay_mask = SMB2_LEASE_WRITE;
1891                 }
1892
1893                 break_to = e_lease_type & ~delay_mask;
1894
1895                 if (will_overwrite) {
1896                         /*
1897                          * we'll decide about SMB2_LEASE_READ later.
1898                          *
1899                          * Maybe the break will be deferred
1900                          */
1901                         break_to &= ~SMB2_LEASE_HANDLE;
1902                 }
1903
1904                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1905                            (unsigned)i, (unsigned)e_lease_type,
1906                            (unsigned)will_overwrite));
1907
1908                 if (e_is_lease && lease != NULL) {
1909                         bool ign;
1910
1911                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1912                                                &lease->lease_key,
1913                                                &e->client_guid,
1914                                                &e->lease_key);
1915                         if (ign) {
1916                                 continue;
1917                         }
1918                 }
1919
1920                 if ((e_lease_type & ~break_to) == 0) {
1921                         if (lease_is_breaking) {
1922                                 delay = true;
1923                         }
1924                         continue;
1925                 }
1926
1927                 if (share_mode_stale_pid(d, i)) {
1928                         continue;
1929                 }
1930
1931                 if (will_overwrite) {
1932                         /*
1933                          * If we break anyway break to NONE directly.
1934                          * Otherwise vfs_set_filelen() will trigger the
1935                          * break.
1936                          */
1937                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1938                 }
1939
1940                 if (!e_is_lease) {
1941                         /*
1942                          * Oplocks only support breaking to R or NONE.
1943                          */
1944                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1945                 }
1946
1947                 DEBUG(10, ("breaking from %d to %d\n",
1948                            (int)e_lease_type, (int)break_to));
1949                 send_break_message(fsp->conn->sconn->msg_ctx, &fsp->file_id,
1950                                    e, break_to);
1951                 if (e_lease_type & delay_mask) {
1952                         delay = true;
1953                 }
1954                 if (lease_is_breaking && !first_open_attempt) {
1955                         delay = true;
1956                 }
1957                 continue;
1958         }
1959
1960         return delay;
1961 }
1962
1963 static bool file_has_brlocks(files_struct *fsp)
1964 {
1965         struct byte_range_lock *br_lck;
1966
1967         br_lck = brl_get_locks_readonly(fsp);
1968         if (!br_lck)
1969                 return false;
1970
1971         return (brl_num_locks(br_lck) > 0);
1972 }
1973
1974 int find_share_mode_lease(struct share_mode_data *d,
1975                           const struct GUID *client_guid,
1976                           const struct smb2_lease_key *key)
1977 {
1978         uint32_t i;
1979
1980         for (i=0; i<d->num_leases; i++) {
1981                 struct share_mode_lease *l = &d->leases[i];
1982
1983                 if (smb2_lease_equal(client_guid,
1984                                      key,
1985                                      &l->client_guid,
1986                                      &l->lease_key)) {
1987                         return i;
1988                 }
1989         }
1990
1991         return -1;
1992 }
1993
1994 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1995                                  const struct smb2_lease_key *key,
1996                                  uint32_t current_state,
1997                                  uint16_t lease_version,
1998                                  uint16_t lease_epoch)
1999 {
2000         struct files_struct *fsp;
2001
2002         /*
2003          * TODO: Measure how expensive this loop is with thousands of open
2004          * handles...
2005          */
2006
2007         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
2008              fsp != NULL;
2009              fsp = file_find_di_next(fsp)) {
2010
2011                 if (fsp == new_fsp) {
2012                         continue;
2013                 }
2014                 if (fsp->oplock_type != LEASE_OPLOCK) {
2015                         continue;
2016                 }
2017                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
2018                         fsp->lease->ref_count += 1;
2019                         return fsp->lease;
2020                 }
2021         }
2022
2023         /* Not found - must be leased in another smbd. */
2024         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
2025         if (new_fsp->lease == NULL) {
2026                 return NULL;
2027         }
2028         new_fsp->lease->ref_count = 1;
2029         new_fsp->lease->sconn = new_fsp->conn->sconn;
2030         new_fsp->lease->lease.lease_key = *key;
2031         new_fsp->lease->lease.lease_state = current_state;
2032         /*
2033          * We internally treat all leases as V2 and update
2034          * the epoch, but when sending breaks it matters if
2035          * the requesting lease was v1 or v2.
2036          */
2037         new_fsp->lease->lease.lease_version = lease_version;
2038         new_fsp->lease->lease.lease_epoch = lease_epoch;
2039         return new_fsp->lease;
2040 }
2041
2042 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
2043                                 struct share_mode_lock *lck,
2044                                 const struct smb2_lease *lease,
2045                                 uint32_t granted)
2046 {
2047         struct share_mode_data *d = lck->data;
2048         const struct GUID *client_guid = fsp_client_guid(fsp);
2049         struct share_mode_lease *tmp;
2050         NTSTATUS status;
2051         int idx;
2052
2053         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
2054
2055         if (idx != -1) {
2056                 struct share_mode_lease *l = &d->leases[idx];
2057                 bool do_upgrade;
2058                 uint32_t existing, requested;
2059
2060                 fsp->lease = find_fsp_lease(
2061                         fsp,
2062                         &lease->lease_key,
2063                         l->current_state,
2064                         l->lease_version,
2065                         l->epoch);
2066                 if (fsp->lease == NULL) {
2067                         DEBUG(1, ("Did not find existing lease for file %s\n",
2068                                   fsp_str_dbg(fsp)));
2069                         return NT_STATUS_NO_MEMORY;
2070                 }
2071
2072                 /*
2073                  * Upgrade only if the requested lease is a strict upgrade.
2074                  */
2075                 existing = l->current_state;
2076                 requested = lease->lease_state;
2077
2078                 /*
2079                  * Tricky: This test makes sure that "requested" is a
2080                  * strict bitwise superset of "existing".
2081                  */
2082                 do_upgrade = ((existing & requested) == existing);
2083
2084                 /*
2085                  * Upgrade only if there's a change.
2086                  */
2087                 do_upgrade &= (granted != existing);
2088
2089                 /*
2090                  * Upgrade only if other leases don't prevent what was asked
2091                  * for.
2092                  */
2093                 do_upgrade &= (granted == requested);
2094
2095                 /*
2096                  * only upgrade if we are not in breaking state
2097                  */
2098                 do_upgrade &= !l->breaking;
2099
2100                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
2101                            "granted=%"PRIu32", do_upgrade=%d\n",
2102                            existing, requested, granted, (int)do_upgrade));
2103
2104                 if (do_upgrade) {
2105                         l->current_state = granted;
2106                         l->epoch += 1;
2107                 }
2108
2109                 {
2110                         NTSTATUS set_status;
2111
2112                         set_status = leases_db_set(
2113                                 client_guid,
2114                                 &lease->lease_key,
2115                                 l->current_state,
2116                                 l->breaking,
2117                                 l->breaking_to_requested,
2118                                 l->breaking_to_required,
2119                                 l->lease_version,
2120                                 l->epoch);
2121
2122                         if (!NT_STATUS_IS_OK(set_status)) {
2123                                 DBG_DEBUG("leases_db_set failed: %s\n",
2124                                           nt_errstr(set_status));
2125                                 return set_status;
2126                         }
2127                 }
2128
2129                 /* Ensure we're in sync with current lease state. */
2130                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
2131                 return NT_STATUS_OK;
2132         }
2133
2134         /*
2135          * Create new lease
2136          */
2137
2138         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
2139                              d->num_leases+1);
2140         if (tmp == NULL) {
2141                 /*
2142                  * See [MS-SMB2]
2143                  */
2144                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2145         }
2146         d->leases = tmp;
2147
2148         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
2149         if (fsp->lease == NULL) {
2150                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2151         }
2152         fsp->lease->ref_count = 1;
2153         fsp->lease->sconn = fsp->conn->sconn;
2154         fsp->lease->lease.lease_version = lease->lease_version;
2155         fsp->lease->lease.lease_key = lease->lease_key;
2156         fsp->lease->lease.lease_state = granted;
2157         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
2158
2159         d->leases[d->num_leases] = (struct share_mode_lease) {
2160                 .client_guid = *client_guid,
2161                 .lease_key = fsp->lease->lease.lease_key,
2162                 .current_state = fsp->lease->lease.lease_state,
2163                 .lease_version = fsp->lease->lease.lease_version,
2164                 .epoch = fsp->lease->lease.lease_epoch,
2165         };
2166
2167         status = leases_db_add(client_guid,
2168                                &lease->lease_key,
2169                                &fsp->file_id,
2170                                fsp->lease->lease.lease_state,
2171                                fsp->lease->lease.lease_version,
2172                                fsp->lease->lease.lease_epoch,
2173                                fsp->conn->connectpath,
2174                                fsp->fsp_name->base_name,
2175                                fsp->fsp_name->stream_name);
2176         if (!NT_STATUS_IS_OK(status)) {
2177                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
2178                            nt_errstr(status)));
2179                 TALLOC_FREE(fsp->lease);
2180                 return NT_STATUS_INSUFFICIENT_RESOURCES;
2181         }
2182
2183         d->num_leases += 1;
2184         d->modified = true;
2185
2186         return NT_STATUS_OK;
2187 }
2188
2189 static bool is_same_lease(const files_struct *fsp,
2190                           const struct share_mode_data *d,
2191                           const struct share_mode_entry *e,
2192                           const struct smb2_lease *lease)
2193 {
2194         if (e->op_type != LEASE_OPLOCK) {
2195                 return false;
2196         }
2197         if (lease == NULL) {
2198                 return false;
2199         }
2200
2201         return smb2_lease_equal(fsp_client_guid(fsp),
2202                                 &lease->lease_key,
2203                                 &e->client_guid,
2204                                 &e->lease_key);
2205 }
2206
2207 static int map_lease_type_to_oplock(uint32_t lease_type)
2208 {
2209         int result = NO_OPLOCK;
2210
2211         switch (lease_type) {
2212         case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
2213                 result = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
2214                 break;
2215         case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
2216                 result = EXCLUSIVE_OPLOCK;
2217                 break;
2218         case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
2219         case SMB2_LEASE_READ:
2220                 result = LEVEL_II_OPLOCK;
2221                 break;
2222         }
2223
2224         return result;
2225 }
2226
2227 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
2228                                       struct files_struct *fsp,
2229                                       struct share_mode_lock *lck,
2230                                       int oplock_request,
2231                                       struct smb2_lease *lease)
2232 {
2233         struct share_mode_data *d = lck->data;
2234         bool got_handle_lease = false;
2235         bool got_oplock = false;
2236         uint32_t i;
2237         uint32_t granted;
2238         const struct GUID *client_guid = NULL;
2239         const struct smb2_lease_key *lease_key = NULL;
2240         bool ok;
2241         NTSTATUS status;
2242
2243         if (oplock_request & INTERNAL_OPEN_ONLY) {
2244                 /* No oplocks on internal open. */
2245                 oplock_request = NO_OPLOCK;
2246                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2247                         fsp->oplock_type, fsp_str_dbg(fsp)));
2248         }
2249
2250         if (oplock_request == LEASE_OPLOCK) {
2251                 if (lease == NULL) {
2252                         /*
2253                          * The SMB2 layer should have checked this
2254                          */
2255                         return NT_STATUS_INTERNAL_ERROR;
2256                 }
2257
2258                 granted = lease->lease_state;
2259
2260                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
2261                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
2262                         granted = SMB2_LEASE_NONE;
2263                 }
2264                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
2265                         DEBUG(10, ("No read or write lease requested\n"));
2266                         granted = SMB2_LEASE_NONE;
2267                 }
2268                 if (granted == SMB2_LEASE_WRITE) {
2269                         DEBUG(10, ("pure write lease requested\n"));
2270                         granted = SMB2_LEASE_NONE;
2271                 }
2272                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
2273                         DEBUG(10, ("write and handle lease requested\n"));
2274                         granted = SMB2_LEASE_NONE;
2275                 }
2276         } else {
2277                 granted = map_oplock_to_lease_type(
2278                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2279         }
2280
2281         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
2282                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
2283                         fsp_str_dbg(fsp)));
2284                 granted &= ~SMB2_LEASE_READ;
2285         }
2286
2287         for (i=0; i<d->num_share_modes; i++) {
2288                 struct share_mode_entry *e = &d->share_modes[i];
2289                 uint32_t e_lease_type;
2290
2291                 e_lease_type = get_lease_type(d, e);
2292
2293                 if ((granted & SMB2_LEASE_WRITE) &&
2294                     !is_same_lease(fsp, d, e, lease) &&
2295                     !share_mode_stale_pid(d, i)) {
2296                         /*
2297                          * Can grant only one writer
2298                          */
2299                         granted &= ~SMB2_LEASE_WRITE;
2300                 }
2301
2302                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
2303                     !share_mode_stale_pid(d, i)) {
2304                         got_handle_lease = true;
2305                 }
2306
2307                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
2308                     !share_mode_stale_pid(d, i)) {
2309                         got_oplock = true;
2310                 }
2311         }
2312
2313         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
2314                 bool allow_level2 =
2315                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
2316                         lp_level2_oplocks(SNUM(fsp->conn));
2317
2318                 if (!allow_level2) {
2319                         granted = SMB2_LEASE_NONE;
2320                 }
2321         }
2322
2323         if (oplock_request == LEASE_OPLOCK) {
2324                 if (got_oplock) {
2325                         granted &= ~SMB2_LEASE_HANDLE;
2326                 }
2327
2328                 fsp->oplock_type = LEASE_OPLOCK;
2329
2330                 status = grant_fsp_lease(fsp, lck, lease, granted);
2331                 if (!NT_STATUS_IS_OK(status)) {
2332                         return status;
2333
2334                 }
2335                 *lease = fsp->lease->lease;
2336
2337                 lease_key = &fsp->lease->lease.lease_key;
2338                 client_guid = fsp_client_guid(fsp);
2339
2340                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
2341         } else {
2342                 if (got_handle_lease) {
2343                         granted = SMB2_LEASE_NONE;
2344                 }
2345
2346                 fsp->oplock_type = map_lease_type_to_oplock(granted);
2347
2348                 status = set_file_oplock(fsp);
2349                 if (!NT_STATUS_IS_OK(status)) {
2350                         /*
2351                          * Could not get the kernel oplock
2352                          */
2353                         fsp->oplock_type = NO_OPLOCK;
2354                 }
2355         }
2356
2357         ok = set_share_mode(
2358                 lck,
2359                 fsp,
2360                 get_current_uid(fsp->conn),
2361                 req ? req->mid : 0,
2362                 fsp->oplock_type,
2363                 client_guid,
2364                 lease_key);
2365         if (!ok) {
2366                 return NT_STATUS_NO_MEMORY;
2367         }
2368
2369         ok = update_num_read_oplocks(fsp, lck);
2370         if (!ok) {
2371                 del_share_mode(lck, fsp);
2372                 return NT_STATUS_INTERNAL_ERROR;
2373         }
2374
2375         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
2376                   fsp->oplock_type, fsp_str_dbg(fsp)));
2377
2378         return NT_STATUS_OK;
2379 }
2380
2381 static bool request_timed_out(struct timeval request_time,
2382                               struct timeval timeout)
2383 {
2384         struct timeval now, end_time;
2385         GetTimeOfDay(&now);
2386         end_time = timeval_sum(&request_time, &timeout);
2387         return (timeval_compare(&end_time, &now) < 0);
2388 }
2389
2390 static struct deferred_open_record *deferred_open_record_create(
2391         bool delayed_for_oplocks,
2392         bool async_open,
2393         struct file_id id)
2394 {
2395         struct deferred_open_record *record = NULL;
2396
2397         record = talloc(NULL, struct deferred_open_record);
2398         if (record == NULL) {
2399                 return NULL;
2400         }
2401
2402         *record = (struct deferred_open_record) {
2403                 .delayed_for_oplocks = delayed_for_oplocks,
2404                 .async_open = async_open,
2405                 .id = id,
2406         };
2407
2408         return record;
2409 }
2410
2411 struct defer_open_state {
2412         struct smbXsrv_connection *xconn;
2413         uint64_t mid;
2414 };
2415
2416 static void defer_open_done(struct tevent_req *req);
2417
2418 /**
2419  * Defer an open and watch a locking.tdb record
2420  *
2421  * This defers an open that gets rescheduled once the locking.tdb record watch
2422  * is triggered by a change to the record.
2423  *
2424  * It is used to defer opens that triggered an oplock break and for the SMB1
2425  * sharing violation delay.
2426  **/
2427 static void defer_open(struct share_mode_lock *lck,
2428                        struct timeval request_time,
2429                        struct timeval timeout,
2430                        struct smb_request *req,
2431                        bool delayed_for_oplocks,
2432                        struct file_id id)
2433 {
2434         struct deferred_open_record *open_rec = NULL;
2435         struct timeval abs_timeout;
2436         struct defer_open_state *watch_state;
2437         struct tevent_req *watch_req;
2438         bool ok;
2439
2440         abs_timeout = timeval_sum(&request_time, &timeout);
2441
2442         DBG_DEBUG("request time [%s] timeout [%s] mid [%" PRIu64 "] "
2443                   "delayed_for_oplocks [%s] file_id [%s]\n",
2444                   timeval_string(talloc_tos(), &request_time, false),
2445                   timeval_string(talloc_tos(), &abs_timeout, false),
2446                   req->mid,
2447                   delayed_for_oplocks ? "yes" : "no",
2448                   file_id_string_tos(&id));
2449
2450         open_rec = deferred_open_record_create(delayed_for_oplocks,
2451                                                false,
2452                                                id);
2453         if (open_rec == NULL) {
2454                 TALLOC_FREE(lck);
2455                 exit_server("talloc failed");
2456         }
2457
2458         watch_state = talloc(open_rec, struct defer_open_state);
2459         if (watch_state == NULL) {
2460                 exit_server("talloc failed");
2461         }
2462         watch_state->xconn = req->xconn;
2463         watch_state->mid = req->mid;
2464
2465         DBG_DEBUG("defering mid %" PRIu64 "\n", req->mid);
2466
2467         watch_req = dbwrap_watched_watch_send(watch_state,
2468                                               req->sconn->ev_ctx,
2469                                               lck->data->record,
2470                                               (struct server_id){0});
2471         if (watch_req == NULL) {
2472                 exit_server("Could not watch share mode record");
2473         }
2474         tevent_req_set_callback(watch_req, defer_open_done, watch_state);
2475
2476         ok = tevent_req_set_endtime(watch_req, req->sconn->ev_ctx, abs_timeout);
2477         if (!ok) {
2478                 exit_server("tevent_req_set_endtime failed");
2479         }
2480
2481         ok = push_deferred_open_message_smb(req, request_time, timeout,
2482                                             open_rec->id, open_rec);
2483         if (!ok) {
2484                 TALLOC_FREE(lck);
2485                 exit_server("push_deferred_open_message_smb failed");
2486         }
2487 }
2488
2489 static void defer_open_done(struct tevent_req *req)
2490 {
2491         struct defer_open_state *state = tevent_req_callback_data(
2492                 req, struct defer_open_state);
2493         NTSTATUS status;
2494         bool ret;
2495
2496         status = dbwrap_watched_watch_recv(req, NULL, NULL);
2497         TALLOC_FREE(req);
2498         if (!NT_STATUS_IS_OK(status)) {
2499                 DEBUG(5, ("dbwrap_watched_watch_recv returned %s\n",
2500                           nt_errstr(status)));
2501                 /*
2502                  * Even if it failed, retry anyway. TODO: We need a way to
2503                  * tell a re-scheduled open about that error.
2504                  */
2505         }
2506
2507         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
2508
2509         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
2510         SMB_ASSERT(ret);
2511         TALLOC_FREE(state);
2512 }
2513
2514 /**
2515  * Actually attempt the kernel oplock polling open.
2516  */
2517
2518 static void kernel_oplock_poll_open_timer(struct tevent_context *ev,
2519                                       struct tevent_timer *te,
2520                                       struct timeval current_time,
2521                                       void *private_data)
2522 {
2523         bool ok;
2524         struct smb_request *req = (struct smb_request *)private_data;
2525
2526         ok = schedule_deferred_open_message_smb(req->xconn, req->mid);
2527         if (!ok) {
2528                 exit_server("schedule_deferred_open_message_smb failed");
2529         }
2530         DBG_DEBUG("kernel_oplock_poll_open_timer fired. Retying open !\n");
2531 }
2532
2533 /**
2534  * Reschedule an open for 1 second from now, if not timed out.
2535  **/
2536 static void setup_kernel_oplock_poll_open(struct timeval request_time,
2537                        struct smb_request *req,
2538                        struct file_id id)
2539 {
2540
2541         bool ok;
2542         struct deferred_open_record *open_rec = NULL;
2543         /* Maximum wait time. */
2544         struct timeval timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2545
2546         if (request_timed_out(request_time, timeout)) {
2547                 return;
2548         }
2549
2550         open_rec = deferred_open_record_create(false, false, id);
2551         if (open_rec == NULL) {
2552                 exit_server("talloc failed");
2553         }
2554
2555         ok = push_deferred_open_message_smb(req,
2556                                             request_time,
2557                                             timeout,
2558                                             id,
2559                                             open_rec);
2560         if (!ok) {
2561                 exit_server("push_deferred_open_message_smb failed");
2562         }
2563
2564         /*
2565          * As this timer event is owned by req, it will
2566          * disappear if req it talloc_freed.
2567          */
2568         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2569                                         req,
2570                                         timeval_current_ofs(1, 0),
2571                                         kernel_oplock_poll_open_timer,
2572                                         req);
2573         if (open_rec->te == NULL) {
2574                 exit_server("tevent_add_timer failed");
2575         }
2576
2577         DBG_DEBUG("poll request time [%s] mid [%" PRIu64 "] file_id [%s]\n",
2578                   timeval_string(talloc_tos(), &request_time, false),
2579                   req->mid,
2580                   file_id_string_tos(&id));
2581 }
2582
2583 /****************************************************************************
2584  On overwrite open ensure that the attributes match.
2585 ****************************************************************************/
2586
2587 static bool open_match_attributes(connection_struct *conn,
2588                                   uint32_t old_dos_attr,
2589                                   uint32_t new_dos_attr,
2590                                   mode_t new_unx_mode,
2591                                   mode_t *returned_unx_mode)
2592 {
2593         uint32_t noarch_old_dos_attr, noarch_new_dos_attr;
2594
2595         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2596         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
2597
2598         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2599            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2600                 *returned_unx_mode = new_unx_mode;
2601         } else {
2602                 *returned_unx_mode = (mode_t)0;
2603         }
2604
2605         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2606                   "new_dos_attr = 0x%x "
2607                   "returned_unx_mode = 0%o\n",
2608                   (unsigned int)old_dos_attr,
2609                   (unsigned int)new_dos_attr,
2610                   (unsigned int)*returned_unx_mode ));
2611
2612         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2613         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2614                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2615                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2616                         return False;
2617                 }
2618         }
2619         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2620                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2621                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2622                         return False;
2623                 }
2624         }
2625         return True;
2626 }
2627
2628 /****************************************************************************
2629  Special FCB or DOS processing in the case of a sharing violation.
2630  Try and find a duplicated file handle.
2631 ****************************************************************************/
2632
2633 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2634                                 connection_struct *conn,
2635                                 files_struct *fsp_to_dup_into,
2636                                 const struct smb_filename *smb_fname,
2637                                 struct file_id id,
2638                                 uint16_t file_pid,
2639                                 uint64_t vuid,
2640                                 uint32_t access_mask,
2641                                 uint32_t share_access,
2642                                 uint32_t create_options)
2643 {
2644         files_struct *fsp;
2645
2646         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2647                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2648
2649         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2650             fsp = file_find_di_next(fsp)) {
2651
2652                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2653                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2654                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2655                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2656                           (unsigned int)fsp->file_pid,
2657                           (unsigned int)fsp->fh->private_options,
2658                           (unsigned int)fsp->access_mask ));
2659
2660                 if (fsp != fsp_to_dup_into &&
2661                     fsp->fh->fd != -1 &&
2662                     fsp->vuid == vuid &&
2663                     fsp->file_pid == file_pid &&
2664                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2665                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2666                     (fsp->access_mask & FILE_WRITE_DATA) &&
2667                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2668                     strequal(fsp->fsp_name->stream_name,
2669                              smb_fname->stream_name)) {
2670                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2671                         break;
2672                 }
2673         }
2674
2675         if (!fsp) {
2676                 return NT_STATUS_NOT_FOUND;
2677         }
2678
2679         /* quite an insane set of semantics ... */
2680         if (is_executable(smb_fname->base_name) &&
2681             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2682                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2683                 return NT_STATUS_INVALID_PARAMETER;
2684         }
2685
2686         /* We need to duplicate this fsp. */
2687         return dup_file_fsp(req, fsp, access_mask, share_access,
2688                             create_options, fsp_to_dup_into);
2689 }
2690
2691 static void schedule_defer_open(struct share_mode_lock *lck,
2692                                 struct file_id id,
2693                                 struct timeval request_time,
2694                                 struct smb_request *req)
2695 {
2696         /* This is a relative time, added to the absolute
2697            request_time value to get the absolute timeout time.
2698            Note that if this is the second or greater time we enter
2699            this codepath for this particular request mid then
2700            request_time is left as the absolute time of the *first*
2701            time this request mid was processed. This is what allows
2702            the request to eventually time out. */
2703
2704         struct timeval timeout;
2705
2706         /* Normally the smbd we asked should respond within
2707          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2708          * the client did, give twice the timeout as a safety
2709          * measure here in case the other smbd is stuck
2710          * somewhere else. */
2711
2712         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2713
2714         if (request_timed_out(request_time, timeout)) {
2715                 return;
2716         }
2717
2718         defer_open(lck, request_time, timeout, req, true, id);
2719 }
2720
2721 /****************************************************************************
2722  Reschedule an open call that went asynchronous.
2723 ****************************************************************************/
2724
2725 static void schedule_async_open_timer(struct tevent_context *ev,
2726                                       struct tevent_timer *te,
2727                                       struct timeval current_time,
2728                                       void *private_data)
2729 {
2730         exit_server("async open timeout");
2731 }
2732
2733 static void schedule_async_open(struct timeval request_time,
2734                                 struct smb_request *req)
2735 {
2736         struct deferred_open_record *open_rec = NULL;
2737         struct timeval timeout = timeval_set(20, 0);
2738         bool ok;
2739
2740         if (request_timed_out(request_time, timeout)) {
2741                 return;
2742         }
2743
2744         open_rec = deferred_open_record_create(false, true, (struct file_id){0});
2745         if (open_rec == NULL) {
2746                 exit_server("deferred_open_record_create failed");
2747         }
2748
2749         ok = push_deferred_open_message_smb(req, request_time, timeout,
2750                                             (struct file_id){0}, open_rec);
2751         if (!ok) {
2752                 exit_server("push_deferred_open_message_smb failed");
2753         }
2754
2755         open_rec->te = tevent_add_timer(req->sconn->ev_ctx,
2756                                         req,
2757                                         timeval_current_ofs(20, 0),
2758                                         schedule_async_open_timer,
2759                                         open_rec);
2760         if (open_rec->te == NULL) {
2761                 exit_server("tevent_add_timer failed");
2762         }
2763 }
2764
2765 /****************************************************************************
2766  Work out what access_mask to use from what the client sent us.
2767 ****************************************************************************/
2768
2769 static NTSTATUS smbd_calculate_maximum_allowed_access(
2770         connection_struct *conn,
2771         const struct smb_filename *smb_fname,
2772         bool use_privs,
2773         uint32_t *p_access_mask)
2774 {
2775         struct security_descriptor *sd;
2776         uint32_t access_granted;
2777         NTSTATUS status;
2778
2779         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2780                 *p_access_mask |= FILE_GENERIC_ALL;
2781                 return NT_STATUS_OK;
2782         }
2783
2784         status = SMB_VFS_GET_NT_ACL(conn, smb_fname,
2785                                     (SECINFO_OWNER |
2786                                      SECINFO_GROUP |
2787                                      SECINFO_DACL),
2788                                     talloc_tos(), &sd);
2789
2790         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2791                 /*
2792                  * File did not exist
2793                  */
2794                 *p_access_mask = FILE_GENERIC_ALL;
2795                 return NT_STATUS_OK;
2796         }
2797         if (!NT_STATUS_IS_OK(status)) {
2798                 DEBUG(10,("Could not get acl on file %s: %s\n",
2799                           smb_fname_str_dbg(smb_fname),
2800                           nt_errstr(status)));
2801                 return NT_STATUS_ACCESS_DENIED;
2802         }
2803
2804         /*
2805          * If we can access the path to this file, by
2806          * default we have FILE_READ_ATTRIBUTES from the
2807          * containing directory. See the section:
2808          * "Algorithm to Check Access to an Existing File"
2809          * in MS-FSA.pdf.
2810          *
2811          * se_file_access_check()
2812          * also takes care of owner WRITE_DAC and READ_CONTROL.
2813          */
2814         status = se_file_access_check(sd,
2815                                  get_current_nttok(conn),
2816                                  use_privs,
2817                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2818                                  &access_granted);
2819
2820         TALLOC_FREE(sd);
2821
2822         if (!NT_STATUS_IS_OK(status)) {
2823                 DEBUG(10, ("Access denied on file %s: "
2824                            "when calculating maximum access\n",
2825                            smb_fname_str_dbg(smb_fname)));
2826                 return NT_STATUS_ACCESS_DENIED;
2827         }
2828         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2829
2830         if (!(access_granted & DELETE_ACCESS)) {
2831                 if (can_delete_file_in_directory(conn, smb_fname)) {
2832                         *p_access_mask |= DELETE_ACCESS;
2833                 }
2834         }
2835
2836         return NT_STATUS_OK;
2837 }
2838
2839 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2840                                     const struct smb_filename *smb_fname,
2841                                     bool use_privs,
2842                                     uint32_t access_mask,
2843                                     uint32_t *access_mask_out)
2844 {
2845         NTSTATUS status;
2846         uint32_t orig_access_mask = access_mask;
2847         uint32_t rejected_share_access;
2848
2849         if (access_mask & SEC_MASK_INVALID) {
2850                 DBG_DEBUG("access_mask [%8x] contains invalid bits\n",
2851                           access_mask);
2852                 return NT_STATUS_ACCESS_DENIED;
2853         }
2854
2855         /*
2856          * Convert GENERIC bits to specific bits.
2857          */
2858
2859         se_map_generic(&access_mask, &file_generic_mapping);
2860
2861         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2862         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2863
2864                 status = smbd_calculate_maximum_allowed_access(
2865                         conn, smb_fname, use_privs, &access_mask);
2866
2867                 if (!NT_STATUS_IS_OK(status)) {
2868                         return status;
2869                 }
2870
2871                 access_mask &= conn->share_access;
2872         }
2873
2874         rejected_share_access = access_mask & ~(conn->share_access);
2875
2876         if (rejected_share_access) {
2877                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2878                         "file %s: rejected by share access mask[0x%08X] "
2879                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2880                         smb_fname_str_dbg(smb_fname),
2881                         conn->share_access,
2882                         orig_access_mask, access_mask,
2883                         rejected_share_access));
2884                 return NT_STATUS_ACCESS_DENIED;
2885         }
2886
2887         *access_mask_out = access_mask;
2888         return NT_STATUS_OK;
2889 }
2890
2891 /****************************************************************************
2892  Remove the deferred open entry under lock.
2893 ****************************************************************************/
2894
2895 /****************************************************************************
2896  Return true if this is a state pointer to an asynchronous create.
2897 ****************************************************************************/
2898
2899 bool is_deferred_open_async(const struct deferred_open_record *rec)
2900 {
2901         return rec->async_open;
2902 }
2903
2904 static bool clear_ads(uint32_t create_disposition)
2905 {
2906         bool ret = false;
2907
2908         switch (create_disposition) {
2909         case FILE_SUPERSEDE:
2910         case FILE_OVERWRITE_IF:
2911         case FILE_OVERWRITE:
2912                 ret = true;
2913                 break;
2914         default:
2915                 break;
2916         }
2917         return ret;
2918 }
2919
2920 static int disposition_to_open_flags(uint32_t create_disposition)
2921 {
2922         int ret = 0;
2923
2924         /*
2925          * Currently we're using FILE_SUPERSEDE as the same as
2926          * FILE_OVERWRITE_IF but they really are
2927          * different. FILE_SUPERSEDE deletes an existing file
2928          * (requiring delete access) then recreates it.
2929          */
2930
2931         switch (create_disposition) {
2932         case FILE_SUPERSEDE:
2933         case FILE_OVERWRITE_IF:
2934                 /*
2935                  * If file exists replace/overwrite. If file doesn't
2936                  * exist create.
2937                  */
2938                 ret = O_CREAT|O_TRUNC;
2939                 break;
2940
2941         case FILE_OPEN:
2942                 /*
2943                  * If file exists open. If file doesn't exist error.
2944                  */
2945                 ret = 0;
2946                 break;
2947
2948         case FILE_OVERWRITE:
2949                 /*
2950                  * If file exists overwrite. If file doesn't exist
2951                  * error.
2952                  */
2953                 ret = O_TRUNC;
2954                 break;
2955
2956         case FILE_CREATE:
2957                 /*
2958                  * If file exists error. If file doesn't exist create.
2959                  */
2960                 ret = O_CREAT|O_EXCL;
2961                 break;
2962
2963         case FILE_OPEN_IF:
2964                 /*
2965                  * If file exists open. If file doesn't exist create.
2966                  */
2967                 ret = O_CREAT;
2968                 break;
2969         }
2970         return ret;
2971 }
2972
2973 static int calculate_open_access_flags(uint32_t access_mask,
2974                                        uint32_t private_flags)
2975 {
2976         bool need_write, need_read;
2977
2978         /*
2979          * Note that we ignore the append flag as append does not
2980          * mean the same thing under DOS and Unix.
2981          */
2982
2983         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2984         if (!need_write) {
2985                 return O_RDONLY;
2986         }
2987
2988         /* DENY_DOS opens are always underlying read-write on the
2989            file handle, no matter what the requested access mask
2990            says. */
2991
2992         need_read =
2993                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2994                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2995                                 FILE_READ_EA|FILE_EXECUTE));
2996
2997         if (!need_read) {
2998                 return O_WRONLY;
2999         }
3000         return O_RDWR;
3001 }
3002
3003 /****************************************************************************
3004  Open a file with a share mode. Passed in an already created files_struct *.
3005 ****************************************************************************/
3006
3007 static NTSTATUS open_file_ntcreate(connection_struct *conn,
3008                             struct smb_request *req,
3009                             uint32_t access_mask,               /* access bits (FILE_READ_DATA etc.) */
3010                             uint32_t share_access,      /* share constants (FILE_SHARE_READ etc) */
3011                             uint32_t create_disposition,        /* FILE_OPEN_IF etc. */
3012                             uint32_t create_options,    /* options such as delete on close. */
3013                             uint32_t new_dos_attributes,        /* attributes used for new file. */
3014                             int oplock_request,         /* internal Samba oplock codes. */
3015                             struct smb2_lease *lease,
3016                                                         /* Information (FILE_EXISTS etc.) */
3017                             uint32_t private_flags,     /* Samba specific flags. */
3018                             int *pinfo,
3019                             files_struct *fsp)
3020 {
3021         struct smb_filename *smb_fname = fsp->fsp_name;
3022         int flags=0;
3023         int flags2=0;
3024         bool file_existed = VALID_STAT(smb_fname->st);
3025         bool def_acl = False;
3026         bool posix_open = False;
3027         bool new_file_created = False;
3028         bool first_open_attempt = true;
3029         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
3030         mode_t new_unx_mode = (mode_t)0;
3031         mode_t unx_mode = (mode_t)0;
3032         int info;
3033         uint32_t existing_dos_attributes = 0;
3034         struct timeval request_time = timeval_zero();
3035         struct share_mode_lock *lck = NULL;
3036         uint32_t open_access_mask = access_mask;
3037         NTSTATUS status;
3038         char *parent_dir;
3039         SMB_STRUCT_STAT saved_stat = smb_fname->st;
3040         struct timespec old_write_time;
3041         struct file_id id;
3042
3043         if (conn->printer) {
3044                 /*
3045                  * Printers are handled completely differently.
3046                  * Most of the passed parameters are ignored.
3047                  */
3048
3049                 if (pinfo) {
3050                         *pinfo = FILE_WAS_CREATED;
3051                 }
3052
3053                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
3054                            smb_fname_str_dbg(smb_fname)));
3055
3056                 if (!req) {
3057                         DEBUG(0,("open_file_ntcreate: printer open without "
3058                                 "an SMB request!\n"));
3059                         return NT_STATUS_INTERNAL_ERROR;
3060                 }
3061
3062                 return print_spool_open(fsp, smb_fname->base_name,
3063                                         req->vuid);
3064         }
3065
3066         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
3067                             NULL)) {
3068                 return NT_STATUS_NO_MEMORY;
3069         }
3070
3071         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3072                 posix_open = True;
3073                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3074                 new_dos_attributes = 0;
3075         } else {
3076                 /* Windows allows a new file to be created and
3077                    silently removes a FILE_ATTRIBUTE_DIRECTORY
3078                    sent by the client. Do the same. */
3079
3080                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
3081
3082                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
3083                  * created new. */
3084                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3085                                      smb_fname, parent_dir);
3086         }
3087
3088         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
3089                    "access_mask=0x%x share_access=0x%x "
3090                    "create_disposition = 0x%x create_options=0x%x "
3091                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
3092                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
3093                    access_mask, share_access, create_disposition,
3094                    create_options, (unsigned int)unx_mode, oplock_request,
3095                    (unsigned int)private_flags));
3096
3097         if (req == NULL) {
3098                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
3099                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
3100         } else {
3101                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
3102                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
3103         }
3104
3105         /*
3106          * Only non-internal opens can be deferred at all
3107          */
3108
3109         if (req) {
3110                 struct deferred_open_record *open_rec;
3111                 if (get_deferred_open_message_state(req,
3112                                 &request_time,
3113                                 &open_rec)) {
3114                         /* Remember the absolute time of the original
3115                            request with this mid. We'll use it later to
3116                            see if this has timed out. */
3117
3118                         /* If it was an async create retry, the file
3119                            didn't exist. */
3120
3121                         if (is_deferred_open_async(open_rec)) {
3122                                 SET_STAT_INVALID(smb_fname->st);
3123                                 file_existed = false;
3124                         }
3125
3126                         /* Ensure we don't reprocess this message. */
3127                         remove_deferred_open_message_smb(req->xconn, req->mid);
3128
3129                         first_open_attempt = false;
3130                 }
3131         }
3132
3133         if (!posix_open) {
3134                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
3135                 if (file_existed) {
3136                         /*
3137                          * Only use strored DOS attributes for checks
3138                          * against requested attributes (below via
3139                          * open_match_attributes()), cf bug #11992
3140                          * for details. -slow
3141                          */
3142                         uint32_t attr = 0;
3143
3144                         status = SMB_VFS_GET_DOS_ATTRIBUTES(conn, smb_fname, &attr);
3145                         if (NT_STATUS_IS_OK(status)) {
3146                                 existing_dos_attributes = attr;
3147                         }
3148                 }
3149         }
3150
3151         /* ignore any oplock requests if oplocks are disabled */
3152         if (!lp_oplocks(SNUM(conn)) ||
3153             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
3154                 /* Mask off everything except the private Samba bits. */
3155                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
3156         }
3157
3158         /* this is for OS/2 long file names - say we don't support them */
3159         if (req != NULL && !req->posix_pathnames &&
3160                         strstr(smb_fname->base_name,".+,;=[].")) {
3161                 /* OS/2 Workplace shell fix may be main code stream in a later
3162                  * release. */
3163                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
3164                          "supported.\n"));
3165                 if (use_nt_status()) {
3166                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3167                 }
3168                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
3169         }
3170
3171         switch( create_disposition ) {
3172                 case FILE_OPEN:
3173                         /* If file exists open. If file doesn't exist error. */
3174                         if (!file_existed) {
3175                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
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_OVERWRITE:
3185                         /* If file exists overwrite. If file doesn't exist
3186                          * error. */
3187                         if (!file_existed) {
3188                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
3189                                          "requested for file %s and file "
3190                                          "doesn't exist.\n",
3191                                          smb_fname_str_dbg(smb_fname) ));
3192                                 errno = ENOENT;
3193                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3194                         }
3195                         break;
3196
3197                 case FILE_CREATE:
3198                         /* If file exists error. If file doesn't exist
3199                          * create. */
3200                         if (file_existed) {
3201                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
3202                                          "requested for file %s and file "
3203                                          "already exists.\n",
3204                                          smb_fname_str_dbg(smb_fname)));
3205                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
3206                                         errno = EISDIR;
3207                                 } else {
3208                                         errno = EEXIST;
3209                                 }
3210                                 return map_nt_error_from_unix(errno);
3211                         }
3212                         break;
3213
3214                 case FILE_SUPERSEDE:
3215                 case FILE_OVERWRITE_IF:
3216                 case FILE_OPEN_IF:
3217                         break;
3218                 default:
3219                         return NT_STATUS_INVALID_PARAMETER;
3220         }
3221
3222         flags2 = disposition_to_open_flags(create_disposition);
3223
3224         /* We only care about matching attributes on file exists and
3225          * overwrite. */
3226
3227         if (!posix_open && file_existed &&
3228             ((create_disposition == FILE_OVERWRITE) ||
3229              (create_disposition == FILE_OVERWRITE_IF))) {
3230                 if (!open_match_attributes(conn, existing_dos_attributes,
3231                                            new_dos_attributes,
3232                                            unx_mode, &new_unx_mode)) {
3233                         DEBUG(5,("open_file_ntcreate: attributes mismatch "
3234                                  "for file %s (%x %x) (0%o, 0%o)\n",
3235                                  smb_fname_str_dbg(smb_fname),
3236                                  existing_dos_attributes,
3237                                  new_dos_attributes,
3238                                  (unsigned int)smb_fname->st.st_ex_mode,
3239                                  (unsigned int)unx_mode ));
3240                         errno = EACCES;
3241                         return NT_STATUS_ACCESS_DENIED;
3242                 }
3243         }
3244
3245         status = smbd_calculate_access_mask(conn, smb_fname,
3246                                         false,
3247                                         access_mask,
3248                                         &access_mask);
3249         if (!NT_STATUS_IS_OK(status)) {
3250                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
3251                         "on file %s returned %s\n",
3252                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
3253                 return status;
3254         }
3255
3256         open_access_mask = access_mask;
3257
3258         if (flags2 & O_TRUNC) {
3259                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
3260         }
3261
3262         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
3263                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
3264                     access_mask));
3265
3266         /*
3267          * Note that we ignore the append flag as append does not
3268          * mean the same thing under DOS and Unix.
3269          */
3270
3271         flags = calculate_open_access_flags(access_mask, private_flags);
3272
3273         /*
3274          * Currently we only look at FILE_WRITE_THROUGH for create options.
3275          */
3276
3277 #if defined(O_SYNC)
3278         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
3279                 flags2 |= O_SYNC;
3280         }
3281 #endif /* O_SYNC */
3282
3283         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
3284                 flags2 |= O_APPEND;
3285         }
3286
3287         if (!posix_open && !CAN_WRITE(conn)) {
3288                 /*
3289                  * We should really return a permission denied error if either
3290                  * O_CREAT or O_TRUNC are set, but for compatibility with
3291                  * older versions of Samba we just AND them out.
3292                  */
3293                 flags2 &= ~(O_CREAT|O_TRUNC);
3294         }
3295
3296         if (lp_kernel_oplocks(SNUM(conn))) {
3297                 /*
3298                  * With kernel oplocks the open breaking an oplock
3299                  * blocks until the oplock holder has given up the
3300                  * oplock or closed the file. We prevent this by always
3301                  * trying to open the file with O_NONBLOCK (see "man
3302                  * fcntl" on Linux).
3303                  *
3304                  * If a process that doesn't use the smbd open files
3305                  * database or communication methods holds a kernel
3306                  * oplock we must periodically poll for available open
3307                  * using O_NONBLOCK.
3308                  */
3309                 flags2 |= O_NONBLOCK;
3310         }
3311
3312         /*
3313          * Ensure we can't write on a read-only share or file.
3314          */
3315
3316         if (flags != O_RDONLY && file_existed &&
3317             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
3318                 DEBUG(5,("open_file_ntcreate: write access requested for "
3319                          "file %s on read only %s\n",
3320                          smb_fname_str_dbg(smb_fname),
3321                          !CAN_WRITE(conn) ? "share" : "file" ));
3322                 errno = EACCES;
3323                 return NT_STATUS_ACCESS_DENIED;
3324         }
3325
3326         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
3327         fsp->share_access = share_access;
3328         fsp->fh->private_options = private_flags;
3329         fsp->access_mask = open_access_mask; /* We change this to the
3330                                               * requested access_mask after
3331                                               * the open is done. */
3332         if (posix_open) {
3333                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
3334         }
3335
3336         if (timeval_is_zero(&request_time)) {
3337                 request_time = fsp->open_time;
3338         }
3339
3340         if ((create_options & FILE_DELETE_ON_CLOSE) &&
3341                         (flags2 & O_CREAT) &&
3342                         !file_existed) {
3343                 /* Delete on close semantics for new files. */
3344                 status = can_set_delete_on_close(fsp,
3345                                                 new_dos_attributes);
3346                 if (!NT_STATUS_IS_OK(status)) {
3347                         fd_close(fsp);
3348                         return status;
3349                 }
3350         }
3351
3352         /*
3353          * Ensure we pay attention to default ACLs on directories if required.
3354          */
3355
3356         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
3357             (def_acl = directory_has_default_acl(conn, parent_dir))) {
3358                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
3359         }
3360
3361         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
3362                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
3363                  (unsigned int)flags, (unsigned int)flags2,
3364                  (unsigned int)unx_mode, (unsigned int)access_mask,
3365                  (unsigned int)open_access_mask));
3366
3367         fsp_open = open_file(fsp, conn, req, parent_dir,
3368                              flags|flags2, unx_mode, access_mask,
3369                              open_access_mask, &new_file_created);
3370
3371         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
3372                 bool delay;
3373
3374                 /*
3375                  * This handles the kernel oplock case:
3376                  *
3377                  * the file has an active kernel oplock and the open() returned
3378                  * EWOULDBLOCK/EAGAIN which maps to NETWORK_BUSY.
3379                  *
3380                  * "Samba locking.tdb oplocks" are handled below after acquiring
3381                  * the sharemode lock with get_share_mode_lock().
3382                  */
3383                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
3384                         DEBUG(10, ("FIFO busy\n"));
3385                         return NT_STATUS_NETWORK_BUSY;
3386                 }
3387                 if (req == NULL) {
3388                         DEBUG(10, ("Internal open busy\n"));
3389                         return NT_STATUS_NETWORK_BUSY;
3390                 }
3391
3392                 /*
3393                  * From here on we assume this is an oplock break triggered
3394                  */
3395
3396                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
3397                 if (lck == NULL) {
3398                         /*
3399                          * No oplock from Samba around. Set up a poll every 1
3400                          * second to retry a non-blocking open until the time
3401                          * expires.
3402                          */
3403                         setup_kernel_oplock_poll_open(request_time,
3404                                                 req,
3405                                                 fsp->file_id);
3406                         DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3407                                 "Retrying with poll\n");
3408                         return NT_STATUS_SHARING_VIOLATION;
3409                 }
3410
3411                 if (!validate_oplock_types(lck)) {
3412                         smb_panic("validate_oplock_types failed");
3413                 }
3414
3415                 delay = delay_for_oplock(fsp, 0, lease, lck, false,
3416                                          create_disposition,
3417                                          first_open_attempt);
3418                 if (delay) {
3419                         schedule_defer_open(lck, fsp->file_id, request_time,
3420                                             req);
3421                         TALLOC_FREE(lck);
3422                         DEBUG(10, ("Sent oplock break request to kernel "
3423                                    "oplock holder\n"));
3424                         return NT_STATUS_SHARING_VIOLATION;
3425                 }
3426
3427                 /*
3428                  * No oplock from Samba around. Set up a poll every 1
3429                  * second to retry a non-blocking open until the time
3430                  * expires.
3431                  */
3432                 setup_kernel_oplock_poll_open(request_time, req, fsp->file_id);
3433
3434                 TALLOC_FREE(lck);
3435                 DBG_DEBUG("No Samba oplock around after EWOULDBLOCK. "
3436                         "Retrying with poll\n");
3437                 return NT_STATUS_SHARING_VIOLATION;
3438         }
3439
3440         if (!NT_STATUS_IS_OK(fsp_open)) {
3441                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
3442                         schedule_async_open(request_time, req);
3443                 }
3444                 return fsp_open;
3445         }
3446
3447         if (new_file_created) {
3448                 /*
3449                  * As we atomically create using O_CREAT|O_EXCL,
3450                  * then if new_file_created is true, then
3451                  * file_existed *MUST* have been false (even
3452                  * if the file was previously detected as being
3453                  * there).
3454                  */
3455                 file_existed = false;
3456         }
3457
3458         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
3459                 /*
3460                  * The file did exist, but some other (local or NFS)
3461                  * process either renamed/unlinked and re-created the
3462                  * file with different dev/ino after we walked the path,
3463                  * but before we did the open. We could retry the
3464                  * open but it's a rare enough case it's easier to
3465                  * just fail the open to prevent creating any problems
3466                  * in the open file db having the wrong dev/ino key.
3467                  */
3468                 fd_close(fsp);
3469                 DBG_WARNING("file %s - dev/ino mismatch. "
3470                             "Old (dev=%ju, ino=%ju). "
3471                             "New (dev=%ju, ino=%ju). Failing open "
3472                             "with NT_STATUS_ACCESS_DENIED.\n",
3473                             smb_fname_str_dbg(smb_fname),
3474                             (uintmax_t)saved_stat.st_ex_dev,
3475                             (uintmax_t)saved_stat.st_ex_ino,
3476                             (uintmax_t)smb_fname->st.st_ex_dev,
3477                             (uintmax_t)smb_fname->st.st_ex_ino);
3478                 return NT_STATUS_ACCESS_DENIED;
3479         }
3480
3481         old_write_time = smb_fname->st.st_ex_mtime;
3482
3483         /*
3484          * Deal with the race condition where two smbd's detect the
3485          * file doesn't exist and do the create at the same time. One
3486          * of them will win and set a share mode, the other (ie. this
3487          * one) should check if the requested share mode for this
3488          * create is allowed.
3489          */
3490
3491         /*
3492          * Now the file exists and fsp is successfully opened,
3493          * fsp->dev and fsp->inode are valid and should replace the
3494          * dev=0,inode=0 from a non existent file. Spotted by
3495          * Nadav Danieli <nadavd@exanet.com>. JRA.
3496          */
3497
3498         id = fsp->file_id;
3499
3500         lck = get_share_mode_lock(talloc_tos(), id,
3501                                   conn->connectpath,
3502                                   smb_fname, &old_write_time);
3503
3504         if (lck == NULL) {
3505                 DEBUG(0, ("open_file_ntcreate: Could not get share "
3506                           "mode lock for %s\n",
3507                           smb_fname_str_dbg(smb_fname)));
3508                 fd_close(fsp);
3509                 return NT_STATUS_SHARING_VIOLATION;
3510         }
3511
3512         /* Get the types we need to examine. */
3513         if (!validate_oplock_types(lck)) {
3514                 smb_panic("validate_oplock_types failed");
3515         }
3516
3517         if (has_delete_on_close(lck, fsp->name_hash)) {
3518                 TALLOC_FREE(lck);
3519                 fd_close(fsp);
3520                 return NT_STATUS_DELETE_PENDING;
3521         }
3522
3523         status = open_mode_check(conn, lck,
3524                                  access_mask, share_access);
3525
3526         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
3527             (lck->data->num_share_modes > 0)) {
3528                 /*
3529                  * This comes from ancient times out of open_mode_check. I
3530                  * have no clue whether this is still necessary. I can't think
3531                  * of a case where this would actually matter further down in
3532                  * this function. I leave it here for further investigation
3533                  * :-)
3534                  */
3535                 file_existed = true;
3536         }
3537
3538         if (req != NULL) {
3539                 /*
3540                  * Handle oplocks, deferring the request if delay_for_oplock()
3541                  * triggered a break message and we have to wait for the break
3542                  * response.
3543                  */
3544                 bool delay;
3545                 bool sharing_violation = NT_STATUS_EQUAL(
3546                         status, NT_STATUS_SHARING_VIOLATION);
3547
3548                 delay = delay_for_oplock(fsp, oplock_request, lease, lck,
3549                                          sharing_violation,
3550                                          create_disposition,
3551                                          first_open_attempt);
3552                 if (delay) {
3553                         schedule_defer_open(lck, fsp->file_id,
3554                                             request_time, req);
3555                         TALLOC_FREE(lck);
3556                         fd_close(fsp);
3557                         return NT_STATUS_SHARING_VIOLATION;
3558                 }
3559         }
3560
3561         if (!NT_STATUS_IS_OK(status)) {
3562                 uint32_t can_access_mask;
3563                 bool can_access = True;
3564
3565                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
3566
3567                 /* Check if this can be done with the deny_dos and fcb
3568                  * calls. */
3569                 if (private_flags &
3570                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
3571                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
3572                         if (req == NULL) {
3573                                 DEBUG(0, ("DOS open without an SMB "
3574                                           "request!\n"));
3575                                 TALLOC_FREE(lck);
3576                                 fd_close(fsp);
3577                                 return NT_STATUS_INTERNAL_ERROR;
3578                         }
3579
3580                         /* Use the client requested access mask here,
3581                          * not the one we open with. */
3582                         status = fcb_or_dos_open(req,
3583                                                  conn,
3584                                                  fsp,
3585                                                  smb_fname,
3586                                                  id,
3587                                                  req->smbpid,
3588                                                  req->vuid,
3589                                                  access_mask,
3590                                                  share_access,
3591                                                  create_options);
3592
3593                         if (NT_STATUS_IS_OK(status)) {
3594                                 TALLOC_FREE(lck);
3595                                 if (pinfo) {
3596                                         *pinfo = FILE_WAS_OPENED;
3597                                 }
3598                                 return NT_STATUS_OK;
3599                         }
3600                 }
3601
3602                 /*
3603                  * This next line is a subtlety we need for
3604                  * MS-Access. If a file open will fail due to share
3605                  * permissions and also for security (access) reasons,
3606                  * we need to return the access failed error, not the
3607                  * share error. We can't open the file due to kernel
3608                  * oplock deadlock (it's possible we failed above on
3609                  * the open_mode_check()) so use a userspace check.
3610                  */
3611
3612                 if (flags & O_RDWR) {
3613                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
3614                 } else if (flags & O_WRONLY) {
3615                         can_access_mask = FILE_WRITE_DATA;
3616                 } else {
3617                         can_access_mask = FILE_READ_DATA;
3618                 }
3619
3620                 if (((can_access_mask & FILE_WRITE_DATA) &&
3621                      !CAN_WRITE(conn)) ||
3622                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
3623                                                               smb_fname,
3624                                                               false,
3625                                                               can_access_mask))) {
3626                         can_access = False;
3627                 }
3628
3629                 /*
3630                  * If we're returning a share violation, ensure we
3631                  * cope with the braindead 1 second delay (SMB1 only).
3632                  */
3633
3634                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
3635                     !conn->sconn->using_smb2 &&
3636                     lp_defer_sharing_violations()) {
3637                         struct timeval timeout;
3638                         int timeout_usecs;
3639
3640                         /* this is a hack to speed up torture tests
3641                            in 'make test' */
3642                         timeout_usecs = lp_parm_int(SNUM(conn),
3643                                                     "smbd","sharedelay",
3644                                                     SHARING_VIOLATION_USEC_WAIT);
3645
3646                         /* This is a relative time, added to the absolute
3647                            request_time value to get the absolute timeout time.
3648                            Note that if this is the second or greater time we enter
3649                            this codepath for this particular request mid then
3650                            request_time is left as the absolute time of the *first*
3651                            time this request mid was processed. This is what allows
3652                            the request to eventually time out. */
3653
3654                         timeout = timeval_set(0, timeout_usecs);
3655
3656                         if (!request_timed_out(request_time, timeout)) {
3657                                 defer_open(lck, request_time, timeout, req,
3658                                            false, id);
3659                         }
3660                 }
3661
3662                 TALLOC_FREE(lck);
3663                 fd_close(fsp);
3664                 if (can_access) {
3665                         /*
3666                          * We have detected a sharing violation here
3667                          * so return the correct error code
3668                          */
3669                         status = NT_STATUS_SHARING_VIOLATION;
3670                 } else {
3671                         status = NT_STATUS_ACCESS_DENIED;
3672                 }
3673                 return status;
3674         }
3675
3676         /* Should we atomically (to the client at least) truncate ? */
3677         if ((!new_file_created) &&
3678             (flags2 & O_TRUNC) &&
3679             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3680                 int ret;
3681
3682                 ret = vfs_set_filelen(fsp, 0);
3683                 if (ret != 0) {
3684                         status = map_nt_error_from_unix(errno);
3685                         TALLOC_FREE(lck);
3686                         fd_close(fsp);
3687                         return status;
3688                 }
3689         }
3690
3691         /*
3692          * We have the share entry *locked*.....
3693          */
3694
3695         /* Delete streams if create_disposition requires it */
3696         if (!new_file_created && clear_ads(create_disposition) &&
3697             !is_ntfs_stream_smb_fname(smb_fname)) {
3698                 status = delete_all_streams(conn, smb_fname);
3699                 if (!NT_STATUS_IS_OK(status)) {
3700                         TALLOC_FREE(lck);
3701                         fd_close(fsp);
3702                         return status;
3703                 }
3704         }
3705
3706         /* note that we ignore failure for the following. It is
3707            basically a hack for NFS, and NFS will never set one of
3708            these only read them. Nobody but Samba can ever set a deny
3709            mode and we have already checked our more authoritative
3710            locking database for permission to set this deny mode. If
3711            the kernel refuses the operations then the kernel is wrong.
3712            note that GPFS supports it as well - jmcd */
3713
3714         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3715                 int ret_flock;
3716                 /*
3717                  * Beware: streams implementing VFS modules may
3718                  * implement streams in a way that fsp will have the
3719                  * basefile open in the fsp fd, so lacking a distinct
3720                  * fd for the stream kernel_flock will apply on the
3721                  * basefile which is wrong. The actual check is
3722                  * deffered to the VFS module implementing the
3723                  * kernel_flock call.
3724                  */
3725                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3726                 if(ret_flock == -1 ){
3727
3728                         TALLOC_FREE(lck);
3729                         fd_close(fsp);
3730
3731                         return NT_STATUS_SHARING_VIOLATION;
3732                 }
3733
3734                 fsp->kernel_share_modes_taken = true;
3735         }
3736
3737         /*
3738          * At this point onwards, we can guarantee that the share entry
3739          * is locked, whether we created the file or not, and that the
3740          * deny mode is compatible with all current opens.
3741          */
3742
3743         /*
3744          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3745          * but we don't have to store this - just ignore it on access check.
3746          */
3747         if (conn->sconn->using_smb2) {
3748                 /*
3749                  * SMB2 doesn't return it (according to Microsoft tests).
3750                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3751                  * File created with access = 0x7 (Read, Write, Delete)
3752                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3753                  */
3754                 fsp->access_mask = access_mask;
3755         } else {
3756                 /* But SMB1 does. */
3757                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3758         }
3759
3760         if (file_existed) {
3761                 /*
3762                  * stat opens on existing files don't get oplocks.
3763                  * They can get leases.
3764                  *
3765                  * Note that we check for stat open on the *open_access_mask*,
3766                  * i.e. the access mask we actually used to do the open,
3767                  * not the one the client asked for (which is in
3768                  * fsp->access_mask). This is due to the fact that
3769                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3770                  * which adds FILE_WRITE_DATA to open_access_mask.
3771                  */
3772                 if (is_stat_open(open_access_mask) && lease == NULL) {
3773                         oplock_request = NO_OPLOCK;
3774                 }
3775         }
3776
3777         if (new_file_created) {
3778                 info = FILE_WAS_CREATED;
3779         } else {
3780                 if (flags2 & O_TRUNC) {
3781                         info = FILE_WAS_OVERWRITTEN;
3782                 } else {
3783                         info = FILE_WAS_OPENED;
3784                 }
3785         }
3786
3787         if (pinfo) {
3788                 *pinfo = info;
3789         }
3790
3791         /*
3792          * Setup the oplock info in both the shared memory and
3793          * file structs.
3794          */
3795         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3796         if (!NT_STATUS_IS_OK(status)) {
3797                 TALLOC_FREE(lck);
3798                 fd_close(fsp);
3799                 return status;
3800         }
3801
3802         /* Handle strange delete on close create semantics. */
3803         if (create_options & FILE_DELETE_ON_CLOSE) {
3804                 if (!new_file_created) {
3805                         status = can_set_delete_on_close(fsp,
3806                                          existing_dos_attributes);
3807
3808                         if (!NT_STATUS_IS_OK(status)) {
3809                                 /* Remember to delete the mode we just added. */
3810                                 del_share_mode(lck, fsp);
3811                                 TALLOC_FREE(lck);
3812                                 fd_close(fsp);
3813                                 return status;
3814                         }
3815                 }
3816                 /* Note that here we set the *initial* delete on close flag,
3817                    not the regular one. The magic gets handled in close. */
3818                 fsp->initial_delete_on_close = True;
3819         }
3820
3821         if (info != FILE_WAS_OPENED) {
3822                 /* Overwritten files should be initially set as archive */
3823                 if ((info == FILE_WAS_OVERWRITTEN && lp_map_archive(SNUM(conn))) ||
3824                     lp_store_dos_attributes(SNUM(conn))) {
3825                         if (!posix_open) {
3826                                 if (file_set_dosmode(conn, smb_fname,
3827                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3828                                             parent_dir, true) == 0) {
3829                                         unx_mode = smb_fname->st.st_ex_mode;
3830                                 }
3831                         }
3832                 }
3833         }
3834
3835         /* Determine sparse flag. */
3836         if (posix_open) {
3837                 /* POSIX opens are sparse by default. */
3838                 fsp->is_sparse = true;
3839         } else {
3840                 fsp->is_sparse = (file_existed &&
3841                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3842         }
3843
3844         /*
3845          * Take care of inherited ACLs on created files - if default ACL not
3846          * selected.
3847          */
3848
3849         if (!posix_open && new_file_created && !def_acl) {
3850                 if (unx_mode != smb_fname->st.st_ex_mode) {
3851                         int ret = SMB_VFS_FCHMOD(fsp, unx_mode);
3852                         if (ret == -1) {
3853                                 DBG_INFO("failed to reset "
3854                                   "attributes of file %s to 0%o\n",
3855                                   smb_fname_str_dbg(smb_fname),
3856                                   (unsigned int)unx_mode);
3857                         }
3858                 }
3859
3860         } else if (new_unx_mode) {
3861                 /*
3862                  * We only get here in the case of:
3863                  *
3864                  * a). Not a POSIX open.
3865                  * b). File already existed.
3866                  * c). File was overwritten.
3867                  * d). Requested DOS attributes didn't match
3868                  *     the DOS attributes on the existing file.
3869                  *
3870                  * In that case new_unx_mode has been set
3871                  * equal to the calculated mode (including
3872                  * possible inheritance of the mode from the
3873                  * containing directory).
3874                  *
3875                  * Note this mode was calculated with the
3876                  * DOS attribute FILE_ATTRIBUTE_ARCHIVE added,
3877                  * so the mode change here is suitable for
3878                  * an overwritten file.
3879                  */
3880
3881                 if (new_unx_mode != smb_fname->st.st_ex_mode) {
3882                         int ret = SMB_VFS_FCHMOD(fsp, new_unx_mode);
3883                         if (ret == -1) {
3884                                 DBG_INFO("failed to reset "
3885                                   "attributes of file %s to 0%o\n",
3886                                   smb_fname_str_dbg(smb_fname),
3887                                   (unsigned int)new_unx_mode);
3888                         }
3889                 }
3890         }
3891
3892         {
3893                 /*
3894                  * Deal with other opens having a modified write time.
3895                  */
3896                 struct timespec write_time = get_share_mode_write_time(lck);
3897
3898                 if (!null_timespec(write_time)) {
3899                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3900                 }
3901         }
3902
3903         TALLOC_FREE(lck);
3904
3905         return NT_STATUS_OK;
3906 }
3907
3908 static NTSTATUS mkdir_internal(connection_struct *conn,
3909                                struct smb_filename *smb_dname,
3910                                uint32_t file_attributes)
3911 {
3912         mode_t mode;
3913         char *parent_dir = NULL;
3914         NTSTATUS status;
3915         bool posix_open = false;
3916         bool need_re_stat = false;
3917         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3918
3919         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3920                 DEBUG(5,("mkdir_internal: failing share access "
3921                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3922                 return NT_STATUS_ACCESS_DENIED;
3923         }
3924
3925         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3926                             NULL)) {
3927                 return NT_STATUS_NO_MEMORY;
3928         }
3929
3930         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3931                 posix_open = true;
3932                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3933         } else {
3934                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3935         }
3936
3937         status = check_parent_access(conn,
3938                                         smb_dname,
3939                                         access_mask);
3940         if(!NT_STATUS_IS_OK(status)) {
3941                 DEBUG(5,("mkdir_internal: check_parent_access "
3942                         "on directory %s for path %s returned %s\n",
3943                         parent_dir,
3944                         smb_dname->base_name,
3945                         nt_errstr(status) ));
3946                 return status;
3947         }
3948
3949         if (SMB_VFS_MKDIR(conn, smb_dname, mode) != 0) {
3950                 return map_nt_error_from_unix(errno);
3951         }
3952
3953         /* Ensure we're checking for a symlink here.... */
3954         /* We don't want to get caught by a symlink racer. */
3955
3956         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3957                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3958                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3959                 return map_nt_error_from_unix(errno);
3960         }
3961
3962         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3963                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3964                           smb_fname_str_dbg(smb_dname)));
3965                 return NT_STATUS_NOT_A_DIRECTORY;
3966         }
3967
3968         if (lp_store_dos_attributes(SNUM(conn))) {
3969                 if (!posix_open) {
3970                         file_set_dosmode(conn, smb_dname,
3971                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3972                                          parent_dir, true);
3973                 }
3974         }
3975
3976         if (lp_inherit_permissions(SNUM(conn))) {
3977                 inherit_access_posix_acl(conn, parent_dir,
3978                                          smb_dname, mode);
3979                 need_re_stat = true;
3980         }
3981
3982         if (!posix_open) {
3983                 /*
3984                  * Check if high bits should have been set,
3985                  * then (if bits are missing): add them.
3986                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3987                  * dir.
3988                  */
3989                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3990                     (mode & ~smb_dname->st.st_ex_mode)) {
3991                         SMB_VFS_CHMOD(conn, smb_dname,
3992                                       (smb_dname->st.st_ex_mode |
3993                                           (mode & ~smb_dname->st.st_ex_mode)));
3994                         need_re_stat = true;
3995                 }
3996         }
3997
3998         /* Change the owner if required. */
3999         if (lp_inherit_owner(SNUM(conn)) != INHERIT_OWNER_NO) {
4000                 change_dir_owner_to_parent(conn, parent_dir,
4001                                            smb_dname,
4002                                            &smb_dname->st);
4003                 need_re_stat = true;
4004         }
4005
4006         if (need_re_stat) {
4007                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
4008                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
4009                           smb_fname_str_dbg(smb_dname), strerror(errno)));
4010                         return map_nt_error_from_unix(errno);
4011                 }
4012         }
4013
4014         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
4015                      smb_dname->base_name);
4016
4017         return NT_STATUS_OK;
4018 }
4019
4020 /****************************************************************************
4021  Open a directory from an NT SMB call.
4022 ****************************************************************************/
4023
4024 static NTSTATUS open_directory(connection_struct *conn,
4025                                struct smb_request *req,
4026                                struct smb_filename *smb_dname,
4027                                uint32_t access_mask,
4028                                uint32_t share_access,
4029                                uint32_t create_disposition,
4030                                uint32_t create_options,
4031                                uint32_t file_attributes,
4032                                int *pinfo,
4033                                files_struct **result)
4034 {
4035         files_struct *fsp = NULL;
4036         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
4037         struct share_mode_lock *lck = NULL;
4038         NTSTATUS status;
4039         struct timespec mtimespec;
4040         int info = 0;
4041         bool ok;
4042
4043         if (is_ntfs_stream_smb_fname(smb_dname)) {
4044                 DEBUG(2, ("open_directory: %s is a stream name!\n",
4045                           smb_fname_str_dbg(smb_dname)));
4046                 return NT_STATUS_NOT_A_DIRECTORY;
4047         }
4048
4049         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
4050                 /* Ensure we have a directory attribute. */
4051                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
4052         }
4053
4054         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
4055                  "share_access = 0x%x create_options = 0x%x, "
4056                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
4057                  smb_fname_str_dbg(smb_dname),
4058                  (unsigned int)access_mask,
4059                  (unsigned int)share_access,
4060                  (unsigned int)create_options,
4061                  (unsigned int)create_disposition,
4062                  (unsigned int)file_attributes));
4063
4064         status = smbd_calculate_access_mask(conn, smb_dname, false,
4065                                             access_mask, &access_mask);
4066         if (!NT_STATUS_IS_OK(status)) {
4067                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
4068                         "on file %s returned %s\n",
4069                         smb_fname_str_dbg(smb_dname),
4070                         nt_errstr(status)));
4071                 return status;
4072         }
4073
4074         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4075                         !security_token_has_privilege(get_current_nttok(conn),
4076                                         SEC_PRIV_SECURITY)) {
4077                 DEBUG(10, ("open_directory: open on %s "
4078                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4079                         smb_fname_str_dbg(smb_dname)));
4080                 return NT_STATUS_PRIVILEGE_NOT_HELD;
4081         }
4082
4083         switch( create_disposition ) {
4084                 case FILE_OPEN:
4085
4086                         if (!dir_existed) {
4087                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
4088                         }
4089
4090                         info = FILE_WAS_OPENED;
4091                         break;
4092
4093                 case FILE_CREATE:
4094
4095                         /* If directory exists error. If directory doesn't
4096                          * exist create. */
4097
4098                         if (dir_existed) {
4099                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
4100                                 DEBUG(2, ("open_directory: unable to create "
4101                                           "%s. Error was %s\n",
4102                                           smb_fname_str_dbg(smb_dname),
4103                                           nt_errstr(status)));
4104                                 return status;
4105                         }
4106
4107                         status = mkdir_internal(conn, smb_dname,
4108                                                 file_attributes);
4109
4110                         if (!NT_STATUS_IS_OK(status)) {
4111                                 DEBUG(2, ("open_directory: unable to create "
4112                                           "%s. Error was %s\n",
4113                                           smb_fname_str_dbg(smb_dname),
4114                                           nt_errstr(status)));
4115                                 return status;
4116                         }
4117
4118                         info = FILE_WAS_CREATED;
4119                         break;
4120
4121                 case FILE_OPEN_IF:
4122                         /*
4123                          * If directory exists open. If directory doesn't
4124                          * exist create.
4125                          */
4126
4127                         if (dir_existed) {
4128                                 status = NT_STATUS_OK;
4129                                 info = FILE_WAS_OPENED;
4130                         } else {
4131                                 status = mkdir_internal(conn, smb_dname,
4132                                                 file_attributes);
4133
4134                                 if (NT_STATUS_IS_OK(status)) {
4135                                         info = FILE_WAS_CREATED;
4136                                 } else {
4137                                         /* Cope with create race. */
4138                                         if (!NT_STATUS_EQUAL(status,
4139                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
4140                                                 DEBUG(2, ("open_directory: unable to create "
4141                                                         "%s. Error was %s\n",
4142                                                         smb_fname_str_dbg(smb_dname),
4143                                                         nt_errstr(status)));
4144                                                 return status;
4145                                         }
4146
4147                                         /*
4148                                          * If mkdir_internal() returned
4149                                          * NT_STATUS_OBJECT_NAME_COLLISION
4150                                          * we still must lstat the path.
4151                                          */
4152
4153                                         if (SMB_VFS_LSTAT(conn, smb_dname)
4154                                                         == -1) {
4155                                                 DEBUG(2, ("Could not stat "
4156                                                         "directory '%s' just "
4157                                                         "opened: %s\n",
4158                                                         smb_fname_str_dbg(
4159                                                                 smb_dname),
4160                                                         strerror(errno)));
4161                                                 return map_nt_error_from_unix(
4162                                                                 errno);
4163                                         }
4164
4165                                         info = FILE_WAS_OPENED;
4166                                 }
4167                         }
4168
4169                         break;
4170
4171                 case FILE_SUPERSEDE:
4172                 case FILE_OVERWRITE:
4173                 case FILE_OVERWRITE_IF:
4174                 default:
4175                         DEBUG(5,("open_directory: invalid create_disposition "
4176                                  "0x%x for directory %s\n",
4177                                  (unsigned int)create_disposition,
4178                                  smb_fname_str_dbg(smb_dname)));
4179                         return NT_STATUS_INVALID_PARAMETER;
4180         }
4181
4182         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
4183                 DEBUG(5,("open_directory: %s is not a directory !\n",
4184                          smb_fname_str_dbg(smb_dname)));
4185                 return NT_STATUS_NOT_A_DIRECTORY;
4186         }
4187
4188         if (info == FILE_WAS_OPENED) {
4189                 status = smbd_check_access_rights(conn,
4190                                                 smb_dname,
4191                                                 false,
4192                                                 access_mask);
4193                 if (!NT_STATUS_IS_OK(status)) {
4194                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
4195                                 "file %s failed with %s\n",
4196                                 smb_fname_str_dbg(smb_dname),
4197                                 nt_errstr(status)));
4198                         return status;
4199                 }
4200         }
4201
4202         status = file_new(req, conn, &fsp);
4203         if(!NT_STATUS_IS_OK(status)) {
4204                 return status;
4205         }
4206
4207         /*
4208          * Setup the files_struct for it.
4209          */
4210
4211         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
4212         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
4213         fsp->file_pid = req ? req->smbpid : 0;
4214         fsp->can_lock = False;
4215         fsp->can_read = False;
4216         fsp->can_write = False;
4217
4218         fsp->share_access = share_access;
4219         fsp->fh->private_options = 0;
4220         /*
4221          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
4222          */
4223         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
4224         fsp->print_file = NULL;
4225         fsp->modified = False;
4226         fsp->oplock_type = NO_OPLOCK;
4227         fsp->sent_oplock_break = NO_BREAK_SENT;
4228         fsp->is_directory = True;
4229         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
4230                 fsp->posix_flags |= FSP_POSIX_FLAGS_ALL;
4231         }
4232         status = fsp_set_smb_fname(fsp, smb_dname);
4233         if (!NT_STATUS_IS_OK(status)) {
4234                 file_free(req, fsp);
4235                 return status;
4236         }
4237
4238         /* Don't store old timestamps for directory
4239            handles in the internal database. We don't
4240            update them in there if new objects
4241            are creaded in the directory. Currently
4242            we only update timestamps on file writes.
4243            See bug #9870.
4244         */
4245         ZERO_STRUCT(mtimespec);
4246
4247         if (access_mask & (FILE_LIST_DIRECTORY|
4248                            FILE_ADD_FILE|
4249                            FILE_ADD_SUBDIRECTORY|
4250                            FILE_TRAVERSE|
4251                            DELETE_ACCESS|
4252                            FILE_DELETE_CHILD)) {
4253 #ifdef O_DIRECTORY
4254                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
4255 #else
4256                 /* POSIX allows us to open a directory with O_RDONLY. */
4257                 status = fd_open(conn, fsp, O_RDONLY, 0);
4258 #endif
4259                 if (!NT_STATUS_IS_OK(status)) {
4260                         DEBUG(5, ("open_directory: Could not open fd for "
4261                                 "%s (%s)\n",
4262                                 smb_fname_str_dbg(smb_dname),
4263                                 nt_errstr(status)));
4264                         file_free(req, fsp);
4265                         return status;
4266                 }
4267         } else {
4268                 fsp->fh->fd = -1;
4269                 DEBUG(10, ("Not opening Directory %s\n",
4270                         smb_fname_str_dbg(smb_dname)));
4271         }
4272
4273         status = vfs_stat_fsp(fsp);
4274         if (!NT_STATUS_IS_OK(status)) {
4275                 fd_close(fsp);
4276                 file_free(req, fsp);
4277                 return status;
4278         }
4279
4280         if(!S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4281                 DEBUG(5,("open_directory: %s is not a directory !\n",
4282                          smb_fname_str_dbg(smb_dname)));
4283                 fd_close(fsp);
4284                 file_free(req, fsp);
4285                 return NT_STATUS_NOT_A_DIRECTORY;
4286         }
4287
4288         /* Ensure there was no race condition.  We need to check
4289          * dev/inode but not permissions, as these can change
4290          * legitimately */
4291         if (!check_same_dev_ino(&smb_dname->st, &fsp->fsp_name->st)) {
4292                 DEBUG(5,("open_directory: stat struct differs for "
4293                         "directory %s.\n",
4294                         smb_fname_str_dbg(smb_dname)));
4295                 fd_close(fsp);
4296                 file_free(req, fsp);
4297                 return NT_STATUS_ACCESS_DENIED;
4298         }
4299
4300         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
4301                                   conn->connectpath, smb_dname,
4302                                   &mtimespec);
4303
4304         if (lck == NULL) {
4305                 DEBUG(0, ("open_directory: Could not get share mode lock for "
4306                           "%s\n", smb_fname_str_dbg(smb_dname)));
4307                 fd_close(fsp);
4308                 file_free(req, fsp);
4309                 return NT_STATUS_SHARING_VIOLATION;
4310         }
4311
4312         if (has_delete_on_close(lck, fsp->name_hash)) {
4313                 TALLOC_FREE(lck);
4314                 fd_close(fsp);
4315                 file_free(req, fsp);
4316                 return NT_STATUS_DELETE_PENDING;
4317         }
4318
4319         status = open_mode_check(conn, lck,
4320                                  access_mask, share_access);
4321
4322         if (!NT_STATUS_IS_OK(status)) {
4323                 TALLOC_FREE(lck);
4324                 fd_close(fsp);
4325                 file_free(req, fsp);
4326                 return status;
4327         }
4328
4329         ok = set_share_mode(
4330                 lck,
4331                 fsp,
4332                 get_current_uid(conn),
4333                 req ? req->mid : 0,
4334                 NO_OPLOCK,
4335                 NULL,
4336                 NULL);
4337         if (!ok) {
4338                 TALLOC_FREE(lck);
4339                 fd_close(fsp);
4340                 file_free(req, fsp);
4341                 return NT_STATUS_NO_MEMORY;
4342         }
4343
4344         /* For directories the delete on close bit at open time seems
4345            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
4346         if (create_options & FILE_DELETE_ON_CLOSE) {
4347                 status = can_set_delete_on_close(fsp, 0);
4348                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
4349                         del_share_mode(lck, fsp);
4350                         TALLOC_FREE(lck);
4351                         fd_close(fsp);
4352                         file_free(req, fsp);
4353                         return status;
4354                 }
4355
4356                 if (NT_STATUS_IS_OK(status)) {
4357                         /* Note that here we set the *initial* delete on close flag,
4358                            not the regular one. The magic gets handled in close. */
4359                         fsp->initial_delete_on_close = True;
4360                 }
4361         }
4362
4363         {
4364                 /*
4365                  * Deal with other opens having a modified write time. Is this
4366                  * possible for directories?
4367                  */
4368                 struct timespec write_time = get_share_mode_write_time(lck);
4369
4370                 if (!null_timespec(write_time)) {
4371                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
4372                 }
4373         }
4374
4375         TALLOC_FREE(lck);
4376
4377         if (pinfo) {
4378                 *pinfo = info;
4379         }
4380
4381         *result = fsp;
4382         return NT_STATUS_OK;
4383 }
4384
4385 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
4386                           struct smb_filename *smb_dname)
4387 {
4388         NTSTATUS status;
4389         files_struct *fsp;
4390
4391         status = SMB_VFS_CREATE_FILE(
4392                 conn,                                   /* conn */
4393                 req,                                    /* req */
4394                 0,                                      /* root_dir_fid */
4395                 smb_dname,                              /* fname */
4396                 FILE_READ_ATTRIBUTES,                   /* access_mask */
4397                 FILE_SHARE_NONE,                        /* share_access */
4398                 FILE_CREATE,                            /* create_disposition*/
4399                 FILE_DIRECTORY_FILE,                    /* create_options */
4400                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
4401                 0,                                      /* oplock_request */
4402                 NULL,                                   /* lease */
4403                 0,                                      /* allocation_size */
4404                 0,                                      /* private_flags */
4405                 NULL,                                   /* sd */
4406                 NULL,                                   /* ea_list */
4407                 &fsp,                                   /* result */
4408                 NULL,                                   /* pinfo */
4409                 NULL, NULL);                            /* create context */
4410
4411         if (NT_STATUS_IS_OK(status)) {
4412                 close_file(req, fsp, NORMAL_CLOSE);
4413         }
4414
4415         return status;
4416 }
4417
4418 /****************************************************************************
4419  Receive notification that one of our open files has been renamed by another
4420  smbd process.
4421 ****************************************************************************/
4422
4423 void msg_file_was_renamed(struct messaging_context *msg,
4424                           void *private_data,
4425                           uint32_t msg_type,
4426                           struct server_id server_id,
4427                           DATA_BLOB *data)
4428 {
4429         files_struct *fsp;
4430         char *frm = (char *)data->data;
4431         struct file_id id;
4432         const char *sharepath;
4433         const char *base_name;
4434         const char *stream_name;
4435         struct smb_filename *smb_fname = NULL;
4436         size_t sp_len, bn_len;
4437         NTSTATUS status;
4438         struct smbd_server_connection *sconn =
4439                 talloc_get_type_abort(private_data,
4440                 struct smbd_server_connection);
4441
4442         if (data->data == NULL
4443             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
4444                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
4445                           (int)data->length));
4446                 return;
4447         }
4448
4449         /* Unpack the message. */
4450         pull_file_id_24(frm, &id);
4451         sharepath = &frm[24];
4452         sp_len = strlen(sharepath);
4453         base_name = sharepath + sp_len + 1;
4454         bn_len = strlen(base_name);
4455         stream_name = sharepath + sp_len + 1 + bn_len + 1;
4456
4457         /* stream_name must always be NULL if there is no stream. */
4458         if (stream_name[0] == '\0') {
4459                 stream_name = NULL;
4460         }
4461
4462         smb_fname = synthetic_smb_fname(talloc_tos(),
4463                                         base_name,
4464                                         stream_name,
4465                                         NULL,
4466                                         0);
4467         if (smb_fname == NULL) {
4468                 return;
4469         }
4470
4471         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
4472                 "file_id %s\n",
4473                 sharepath, smb_fname_str_dbg(smb_fname),
4474                 file_id_string_tos(&id)));
4475
4476         for(fsp = file_find_di_first(sconn, id); fsp;
4477             fsp = file_find_di_next(fsp)) {
4478                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
4479
4480                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
4481                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
4482                                 smb_fname_str_dbg(smb_fname)));
4483                         status = fsp_set_smb_fname(fsp, smb_fname);
4484                         if (!NT_STATUS_IS_OK(status)) {
4485                                 goto out;
4486                         }
4487                 } else {
4488                         /* TODO. JRA. */
4489                         /* Now we have the complete path we can work out if this is
4490                            actually within this share and adjust newname accordingly. */
4491                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
4492                                 "not sharepath %s) "
4493                                 "%s from %s -> %s\n",
4494                                 fsp->conn->connectpath,
4495                                 sharepath,
4496                                 fsp_fnum_dbg(fsp),
4497                                 fsp_str_dbg(fsp),
4498                                 smb_fname_str_dbg(smb_fname)));
4499                 }
4500         }
4501  out:
4502         TALLOC_FREE(smb_fname);
4503         return;
4504 }
4505
4506 /*
4507  * If a main file is opened for delete, all streams need to be checked for
4508  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
4509  * If that works, delete them all by setting the delete on close and close.
4510  */
4511
4512 static NTSTATUS open_streams_for_delete(connection_struct *conn,
4513                                         const struct smb_filename *smb_fname)
4514 {
4515         struct stream_struct *stream_info = NULL;
4516         files_struct **streams = NULL;
4517         int i;
4518         unsigned int num_streams = 0;
4519         TALLOC_CTX *frame = talloc_stackframe();
4520         NTSTATUS status;
4521
4522         status = vfs_streaminfo(conn, NULL, smb_fname, talloc_tos(),
4523                                 &num_streams, &stream_info);
4524
4525         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
4526             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
4527                 DEBUG(10, ("no streams around\n"));
4528                 TALLOC_FREE(frame);
4529                 return NT_STATUS_OK;
4530         }
4531
4532         if (!NT_STATUS_IS_OK(status)) {
4533                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
4534                            nt_errstr(status)));
4535                 goto fail;
4536         }
4537
4538         DEBUG(10, ("open_streams_for_delete found %d streams\n",
4539                    num_streams));
4540
4541         if (num_streams == 0) {
4542                 TALLOC_FREE(frame);
4543                 return NT_STATUS_OK;
4544         }
4545
4546         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
4547         if (streams == NULL) {
4548                 DEBUG(0, ("talloc failed\n"));
4549                 status = NT_STATUS_NO_MEMORY;
4550                 goto fail;
4551         }
4552
4553         for (i=0; i<num_streams; i++) {
4554                 struct smb_filename *smb_fname_cp;
4555
4556                 if (strequal(stream_info[i].name, "::$DATA")) {
4557                         streams[i] = NULL;
4558                         continue;
4559                 }
4560
4561                 smb_fname_cp = synthetic_smb_fname(talloc_tos(),
4562                                         smb_fname->base_name,
4563                                         stream_info[i].name,
4564                                         NULL,
4565                                         (smb_fname->flags &
4566                                                 ~SMB_FILENAME_POSIX_PATH));
4567                 if (smb_fname_cp == NULL) {
4568                         status = NT_STATUS_NO_MEMORY;
4569                         goto fail;
4570                 }
4571
4572                 if (SMB_VFS_STAT(conn, smb_fname_cp) == -1) {
4573                         DEBUG(10, ("Unable to stat stream: %s\n",
4574                                    smb_fname_str_dbg(smb_fname_cp)));
4575                 }
4576
4577                 status = SMB_VFS_CREATE_FILE(
4578                          conn,                  /* conn */
4579                          NULL,                  /* req */
4580                          0,                     /* root_dir_fid */
4581                          smb_fname_cp,          /* fname */
4582                          DELETE_ACCESS,         /* access_mask */
4583                          (FILE_SHARE_READ |     /* share_access */
4584                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
4585                          FILE_OPEN,             /* create_disposition*/
4586                          0,                     /* create_options */
4587                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
4588                          0,                     /* oplock_request */
4589                          NULL,                  /* lease */
4590                          0,                     /* allocation_size */
4591                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
4592                          NULL,                  /* sd */
4593                          NULL,                  /* ea_list */
4594                          &streams[i],           /* result */
4595                          NULL,                  /* pinfo */
4596                          NULL, NULL);           /* create context */
4597
4598                 if (!NT_STATUS_IS_OK(status)) {
4599                         DEBUG(10, ("Could not open stream %s: %s\n",
4600                                    smb_fname_str_dbg(smb_fname_cp),
4601                                    nt_errstr(status)));
4602
4603                         TALLOC_FREE(smb_fname_cp);
4604                         break;
4605                 }
4606                 TALLOC_FREE(smb_fname_cp);
4607         }
4608
4609         /*
4610          * don't touch the variable "status" beyond this point :-)
4611          */
4612
4613         for (i -= 1 ; i >= 0; i--) {
4614                 if (streams[i] == NULL) {
4615                         continue;
4616                 }
4617
4618                 DEBUG(10, ("Closing stream # %d, %s\n", i,
4619                            fsp_str_dbg(streams[i])));
4620                 close_file(NULL, streams[i], NORMAL_CLOSE);
4621         }
4622
4623  fail:
4624         TALLOC_FREE(frame);
4625         return status;
4626 }
4627
4628 /*********************************************************************
4629  Create a default ACL by inheriting from the parent. If no inheritance
4630  from the parent available, don't set anything. This will leave the actual
4631  permissions the new file or directory already got from the filesystem
4632  as the NT ACL when read.
4633 *********************************************************************/
4634
4635 static NTSTATUS inherit_new_acl(files_struct *fsp)
4636 {
4637         TALLOC_CTX *frame = talloc_stackframe();
4638         char *parent_name = NULL;
4639         struct security_descriptor *parent_desc = NULL;
4640         NTSTATUS status = NT_STATUS_OK;
4641         struct security_descriptor *psd = NULL;
4642         const struct dom_sid *owner_sid = NULL;
4643         const struct dom_sid *group_sid = NULL;
4644         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
4645         struct security_token *token = fsp->conn->session_info->security_token;
4646         bool inherit_owner =
4647             (lp_inherit_owner(SNUM(fsp->conn)) == INHERIT_OWNER_WINDOWS_AND_UNIX);
4648         bool inheritable_components = false;
4649         bool try_builtin_administrators = false;
4650         const struct dom_sid *BA_U_sid = NULL;
4651         const struct dom_sid *BA_G_sid = NULL;
4652         bool try_system = false;
4653         const struct dom_sid *SY_U_sid = NULL;
4654         const struct dom_sid *SY_G_sid = NULL;
4655         size_t size = 0;
4656         struct smb_filename *parent_smb_fname = NULL;
4657
4658         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
4659                 TALLOC_FREE(frame);
4660                 return NT_STATUS_NO_MEMORY;
4661         }
4662         parent_smb_fname = synthetic_smb_fname(talloc_tos(),
4663                                                 parent_name,
4664                                                 NULL,
4665                                                 NULL,
4666                                                 fsp->fsp_name->flags);
4667
4668         if (parent_smb_fname == NULL) {
4669                 TALLOC_FREE(frame);
4670                 return NT_STATUS_NO_MEMORY;
4671         }
4672
4673         status = SMB_VFS_GET_NT_ACL(fsp->conn,
4674                                     parent_smb_fname,
4675                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
4676                                     frame,
4677                                     &parent_desc);
4678         if (!NT_STATUS_IS_OK(status)) {
4679                 TALLOC_FREE(frame);
4680                 return status;
4681         }
4682
4683         inheritable_components = sd_has_inheritable_components(parent_desc,
4684                                         fsp->is_directory);
4685
4686         if (!inheritable_components && !inherit_owner) {
4687                 TALLOC_FREE(frame);
4688                 /* Nothing to inherit and not setting owner. */
4689                 return NT_STATUS_OK;
4690         }
4691
4692         /* Create an inherited descriptor from the parent. */
4693
4694         if (DEBUGLEVEL >= 10) {
4695                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
4696                         fsp_str_dbg(fsp) ));
4697                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
4698         }
4699
4700         /* Inherit from parent descriptor if "inherit owner" set. */
4701         if (inherit_owner) {
4702                 owner_sid = parent_desc->owner_sid;
4703                 group_sid = parent_desc->group_sid;
4704         }
4705
4706         if (owner_sid == NULL) {
4707                 if (security_token_has_builtin_administrators(token)) {
4708                         try_builtin_administrators = true;
4709                 } else if (security_token_is_system(token)) {
4710                         try_builtin_administrators = true;
4711                         try_system = true;
4712                 }
4713         }
4714
4715         if (group_sid == NULL &&
4716             token->num_sids == PRIMARY_GROUP_SID_INDEX)
4717         {
4718                 if (security_token_is_system(token)) {
4719                         try_builtin_administrators = true;
4720                         try_system = true;
4721                 }
4722         }
4723
4724         if (try_builtin_administrators) {
4725                 struct unixid ids;
4726                 bool ok;
4727
4728                 ZERO_STRUCT(ids);
4729                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4730                 if (ok) {
4731                         switch (ids.type) {
4732                         case ID_TYPE_BOTH:
4733                                 BA_U_sid = &global_sid_Builtin_Administrators;
4734                                 BA_G_sid = &global_sid_Builtin_Administrators;
4735                                 break;
4736                         case ID_TYPE_UID:
4737                                 BA_U_sid = &global_sid_Builtin_Administrators;
4738                                 break;
4739                         case ID_TYPE_GID:
4740                                 BA_G_sid = &global_sid_Builtin_Administrators;
4741                                 break;
4742                         default:
4743                                 break;
4744                         }
4745                 }
4746         }
4747
4748         if (try_system) {
4749                 struct unixid ids;
4750                 bool ok;
4751
4752                 ZERO_STRUCT(ids);
4753                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4754                 if (ok) {
4755                         switch (ids.type) {
4756                         case ID_TYPE_BOTH:
4757                                 SY_U_sid = &global_sid_System;
4758                                 SY_G_sid = &global_sid_System;
4759                                 break;
4760                         case ID_TYPE_UID:
4761                                 SY_U_sid = &global_sid_System;
4762                                 break;
4763                         case ID_TYPE_GID:
4764                                 SY_G_sid = &global_sid_System;
4765                                 break;
4766                         default:
4767                                 break;
4768                         }
4769                 }
4770         }
4771
4772         if (owner_sid == NULL) {
4773                 owner_sid = BA_U_sid;
4774         }
4775
4776         if (owner_sid == NULL) {
4777                 owner_sid = SY_U_sid;
4778         }
4779
4780         if (group_sid == NULL) {
4781                 group_sid = SY_G_sid;
4782         }
4783
4784         if (try_system && group_sid == NULL) {
4785                 group_sid = BA_G_sid;
4786         }
4787
4788         if (owner_sid == NULL) {
4789                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4790         }
4791         if (group_sid == NULL) {
4792                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4793                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4794                 } else {
4795                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4796                 }
4797         }
4798
4799         status = se_create_child_secdesc(frame,
4800                         &psd,
4801                         &size,
4802                         parent_desc,
4803                         owner_sid,
4804                         group_sid,
4805                         fsp->is_directory);
4806         if (!NT_STATUS_IS_OK(status)) {
4807                 TALLOC_FREE(frame);
4808                 return status;
4809         }
4810
4811         /* If inheritable_components == false,
4812            se_create_child_secdesc()
4813            creates a security descriptor with a NULL dacl
4814            entry, but with SEC_DESC_DACL_PRESENT. We need
4815            to remove that flag. */
4816
4817         if (!inheritable_components) {
4818                 security_info_sent &= ~SECINFO_DACL;
4819                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4820         }
4821
4822         if (DEBUGLEVEL >= 10) {
4823                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4824                         fsp_str_dbg(fsp) ));
4825                 NDR_PRINT_DEBUG(security_descriptor, psd);
4826         }
4827
4828         if (inherit_owner) {
4829                 /* We need to be root to force this. */
4830                 become_root();
4831         }
4832         status = SMB_VFS_FSET_NT_ACL(fsp,
4833                         security_info_sent,
4834                         psd);
4835         if (inherit_owner) {
4836                 unbecome_root();
4837         }
4838         TALLOC_FREE(frame);
4839         return status;
4840 }
4841
4842 /*
4843  * If we already have a lease, it must match the new file id. [MS-SMB2]
4844  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4845  * used for a different file name.
4846  */
4847
4848 struct lease_match_state {
4849         /* Input parameters. */
4850         TALLOC_CTX *mem_ctx;
4851         const char *servicepath;
4852         const struct smb_filename *fname;
4853         bool file_existed;
4854         struct file_id id;
4855         /* Return parameters. */
4856         uint32_t num_file_ids;
4857         struct file_id *ids;
4858         NTSTATUS match_status;
4859 };
4860
4861 /*************************************************************
4862  File doesn't exist but this lease key+guid is already in use.
4863
4864  This is only allowable in the dynamic share case where the
4865  service path must be different.
4866
4867  There is a small race condition here in the multi-connection
4868  case where a client sends two create calls on different connections,
4869  where the file doesn't exist and one smbd creates the leases_db
4870  entry first, but this will get fixed by the multichannel cleanup
4871  when all identical client_guids get handled by a single smbd.
4872 **************************************************************/
4873
4874 static void lease_match_parser_new_file(
4875         uint32_t num_files,
4876         const struct leases_db_file *files,
4877         struct lease_match_state *state)
4878 {
4879         uint32_t i;
4880
4881         for (i = 0; i < num_files; i++) {
4882                 const struct leases_db_file *f = &files[i];
4883                 if (strequal(state->servicepath, f->servicepath)) {
4884                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4885                         return;
4886                 }
4887         }
4888
4889         /* Dynamic share case. Break leases on all other files. */
4890         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4891                                         num_files,
4892                                         files,
4893                                         &state->ids);
4894         if (!NT_STATUS_IS_OK(state->match_status)) {
4895                 return;
4896         }
4897
4898         state->num_file_ids = num_files;
4899         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4900         return;
4901 }
4902
4903 static void lease_match_parser(
4904         uint32_t num_files,
4905         const struct leases_db_file *files,
4906         void *private_data)
4907 {
4908         struct lease_match_state *state =
4909                 (struct lease_match_state *)private_data;
4910         uint32_t i;
4911
4912         if (!state->file_existed) {
4913                 /*
4914                  * Deal with name mismatch or
4915                  * possible dynamic share case separately
4916                  * to make code clearer.
4917                  */
4918                 lease_match_parser_new_file(num_files,
4919                                                 files,
4920                                                 state);
4921                 return;
4922         }
4923
4924         /* File existed. */
4925         state->match_status = NT_STATUS_OK;
4926
4927         for (i = 0; i < num_files; i++) {
4928                 const struct leases_db_file *f = &files[i];
4929
4930                 /* Everything should be the same. */
4931                 if (!file_id_equal(&state->id, &f->id)) {
4932                         /* This should catch all dynamic share cases. */
4933                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4934                         break;
4935                 }
4936                 if (!strequal(f->servicepath, state->servicepath)) {
4937                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4938                         break;
4939                 }
4940                 if (!strequal(f->base_name, state->fname->base_name)) {
4941                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4942                         break;
4943                 }
4944                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4945                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4946                         break;
4947                 }
4948         }
4949
4950         if (NT_STATUS_IS_OK(state->match_status)) {
4951                 /*
4952                  * Common case - just opening another handle on a
4953                  * file on a non-dynamic share.
4954                  */
4955                 return;
4956         }
4957
4958         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4959                 /* Mismatched path. Error back to client. */
4960                 return;
4961         }
4962
4963         /*
4964          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4965          * Don't allow leases.
4966          */
4967
4968         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4969                                         num_files,
4970                                         files,
4971                                         &state->ids);
4972         if (!NT_STATUS_IS_OK(state->match_status)) {
4973                 return;
4974         }
4975
4976         state->num_file_ids = num_files;
4977         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4978         return;
4979 }
4980
4981 static NTSTATUS lease_match(connection_struct *conn,
4982                             struct smb_request *req,
4983                             struct smb2_lease_key *lease_key,
4984                             const char *servicepath,
4985                             const struct smb_filename *fname,
4986                             uint16_t *p_version,
4987                             uint16_t *p_epoch)
4988 {
4989         struct smbd_server_connection *sconn = req->sconn;
4990         TALLOC_CTX *tos = talloc_tos();
4991         struct lease_match_state state = {
4992                 .mem_ctx = tos,
4993                 .servicepath = servicepath,
4994                 .fname = fname,
4995                 .match_status = NT_STATUS_OK
4996         };
4997         uint32_t i;
4998         NTSTATUS status;
4999
5000         state.file_existed = VALID_STAT(fname->st);
5001         if (state.file_existed) {
5002                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
5003         }
5004
5005         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
5006                                  lease_key, lease_match_parser, &state);
5007         if (!NT_STATUS_IS_OK(status)) {
5008                 /*
5009                  * Not found or error means okay: We can make the lease pass
5010                  */
5011                 return NT_STATUS_OK;
5012         }
5013         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5014                 /*
5015                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
5016                  * deal with it.
5017                  */
5018                 return state.match_status;
5019         }
5020
5021         /* We have to break all existing leases. */
5022         for (i = 0; i < state.num_file_ids; i++) {
5023                 struct share_mode_lock *lck;
5024                 struct share_mode_data *d;
5025                 uint32_t j;
5026
5027                 if (file_id_equal(&state.ids[i], &state.id)) {
5028                         /* Don't need to break our own file. */
5029                         continue;
5030                 }
5031
5032                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
5033                 if (lck == NULL) {
5034                         /* Race condition - file already closed. */
5035                         continue;
5036                 }
5037                 d = lck->data;
5038                 for (j=0; j<d->num_share_modes; j++) {
5039                         struct share_mode_entry *e = &d->share_modes[j];
5040                         uint32_t e_lease_type = get_lease_type(d, e);
5041
5042                         if (share_mode_stale_pid(d, j)) {
5043                                 continue;
5044                         }
5045
5046                         if (e->op_type == LEASE_OPLOCK) {
5047                                 struct share_mode_lease *l = NULL;
5048                                 l = &lck->data->leases[e->lease_idx];
5049                                 if (!smb2_lease_key_equal(&e->lease_key,
5050                                                           lease_key)) {
5051                                         continue;
5052                                 }
5053                                 *p_epoch = l->epoch;
5054                                 *p_version = l->lease_version;
5055                         }
5056
5057                         if (e_lease_type == SMB2_LEASE_NONE) {
5058                                 continue;
5059                         }
5060
5061                         send_break_message(conn->sconn->msg_ctx, &d->id, e,
5062                                            SMB2_LEASE_NONE);
5063
5064                         /*
5065                          * Windows 7 and 8 lease clients
5066                          * are broken in that they will not
5067                          * respond to lease break requests
5068                          * whilst waiting for an outstanding
5069                          * open request on that lease handle
5070                          * on the same TCP connection, due
5071                          * to holding an internal inode lock.
5072                          *
5073                          * This means we can't reschedule
5074                          * ourselves here, but must return
5075                          * from the create.
5076                          *
5077                          * Work around:
5078                          *
5079                          * Send the breaks and then return
5080                          * SMB2_LEASE_NONE in the lease handle
5081                          * to cause them to acknowledge the
5082                          * lease break. Consultation with
5083                          * Microsoft engineering confirmed
5084                          * this approach is safe.
5085                          */
5086
5087                 }
5088                 TALLOC_FREE(lck);
5089         }
5090         /*
5091          * Ensure we don't grant anything more so we
5092          * never upgrade.
5093          */
5094         return NT_STATUS_OPLOCK_NOT_GRANTED;
5095 }
5096
5097 /*
5098  * Wrapper around open_file_ntcreate and open_directory
5099  */
5100
5101 static NTSTATUS create_file_unixpath(connection_struct *conn,
5102                                      struct smb_request *req,
5103                                      struct smb_filename *smb_fname,
5104                                      uint32_t access_mask,
5105                                      uint32_t share_access,
5106                                      uint32_t create_disposition,
5107                                      uint32_t create_options,
5108                                      uint32_t file_attributes,
5109                                      uint32_t oplock_request,
5110                                      struct smb2_lease *lease,
5111                                      uint64_t allocation_size,
5112                                      uint32_t private_flags,
5113                                      struct security_descriptor *sd,
5114                                      struct ea_list *ea_list,
5115
5116                                      files_struct **result,
5117                                      int *pinfo)
5118 {
5119         int info = FILE_WAS_OPENED;
5120         files_struct *base_fsp = NULL;
5121         files_struct *fsp = NULL;
5122         NTSTATUS status;
5123
5124         DBG_DEBUG("create_file_unixpath: access_mask = 0x%x "
5125                   "file_attributes = 0x%x, share_access = 0x%x, "
5126                   "create_disposition = 0x%x create_options = 0x%x "
5127                   "oplock_request = 0x%x private_flags = 0x%x "
5128                   "ea_list = %p, sd = %p, "
5129                   "fname = %s\n",
5130                   (unsigned int)access_mask,
5131                   (unsigned int)file_attributes,
5132                   (unsigned int)share_access,
5133                   (unsigned int)create_disposition,
5134                   (unsigned int)create_options,
5135                   (unsigned int)oplock_request,
5136                   (unsigned int)private_flags,
5137                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5138
5139         if (create_options & FILE_OPEN_BY_FILE_ID) {
5140                 status = NT_STATUS_NOT_SUPPORTED;
5141                 goto fail;
5142         }
5143
5144         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
5145                 status = NT_STATUS_INVALID_PARAMETER;
5146                 goto fail;
5147         }
5148
5149         if (req == NULL) {
5150                 oplock_request |= INTERNAL_OPEN_ONLY;
5151         }
5152
5153         if (lease != NULL) {
5154                 uint16_t epoch = lease->lease_epoch;
5155                 uint16_t version = lease->lease_version;
5156
5157                 if (req == NULL) {
5158                         DBG_WARNING("Got lease on internal open\n");
5159                         status = NT_STATUS_INTERNAL_ERROR;
5160                         goto fail;
5161                 }
5162
5163                 status = lease_match(conn,
5164                                 req,
5165                                 &lease->lease_key,
5166                                 conn->connectpath,
5167                                 smb_fname,
5168                                 &version,
5169                                 &epoch);
5170                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
5171                         /* Dynamic share file. No leases and update epoch... */
5172                         lease->lease_state = SMB2_LEASE_NONE;
5173                         lease->lease_epoch = epoch;
5174                         lease->lease_version = version;
5175                 } else if (!NT_STATUS_IS_OK(status)) {
5176                         goto fail;
5177                 }
5178         }
5179
5180         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5181             && (access_mask & DELETE_ACCESS)
5182             && !is_ntfs_stream_smb_fname(smb_fname)) {
5183                 /*
5184                  * We can't open a file with DELETE access if any of the
5185                  * streams is open without FILE_SHARE_DELETE
5186                  */
5187                 status = open_streams_for_delete(conn, smb_fname);
5188
5189                 if (!NT_STATUS_IS_OK(status)) {
5190                         goto fail;
5191                 }
5192         }
5193
5194         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
5195                         !security_token_has_privilege(get_current_nttok(conn),
5196                                         SEC_PRIV_SECURITY)) {
5197                 DEBUG(10, ("create_file_unixpath: open on %s "
5198                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
5199                         smb_fname_str_dbg(smb_fname)));
5200                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
5201                 goto fail;
5202         }
5203
5204         /*
5205          * Files or directories can't be opened DELETE_ON_CLOSE without
5206          * delete access.
5207          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13358
5208          */
5209         if (create_options & FILE_DELETE_ON_CLOSE) {
5210                 if ((access_mask & DELETE_ACCESS) == 0) {
5211                         status = NT_STATUS_INVALID_PARAMETER;
5212                         goto fail;
5213                 }
5214         }
5215
5216         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
5217             && is_ntfs_stream_smb_fname(smb_fname)
5218             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
5219                 uint32_t base_create_disposition;
5220                 struct smb_filename *smb_fname_base = NULL;
5221                 uint32_t base_privflags;
5222
5223                 if (create_options & FILE_DIRECTORY_FILE) {
5224                         status = NT_STATUS_NOT_A_DIRECTORY;
5225                         goto fail;
5226                 }
5227
5228                 switch (create_disposition) {
5229                 case FILE_OPEN:
5230                         base_create_disposition = FILE_OPEN;
5231                         break;
5232                 default:
5233                         base_create_disposition = FILE_OPEN_IF;
5234                         break;
5235                 }
5236
5237                 /* Create an smb_filename with stream_name == NULL. */
5238                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
5239                                                 smb_fname->base_name,
5240                                                 NULL,
5241                                                 NULL,
5242                                                 smb_fname->flags);
5243                 if (smb_fname_base == NULL) {
5244                         status = NT_STATUS_NO_MEMORY;
5245                         goto fail;
5246                 }
5247
5248                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
5249                         DEBUG(10, ("Unable to stat stream: %s\n",
5250                                    smb_fname_str_dbg(smb_fname_base)));
5251                 } else {
5252                         /*
5253                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
5254                          * We need to check if the requested access mask
5255                          * could be used to open the underlying file (if
5256                          * it existed), as we're passing in zero for the
5257                          * access mask to the base filename.
5258                          */
5259                         status = check_base_file_access(conn,
5260                                                         smb_fname_base,
5261                                                         access_mask);
5262
5263                         if (!NT_STATUS_IS_OK(status)) {
5264                                 DEBUG(10, ("Permission check "
5265                                         "for base %s failed: "
5266                                         "%s\n", smb_fname->base_name,
5267                                         nt_errstr(status)));
5268                                 goto fail;
5269                         }
5270                 }
5271
5272                 base_privflags = NTCREATEX_OPTIONS_PRIVATE_STREAM_BASEOPEN;
5273
5274                 /* Open the base file. */
5275                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
5276                                               FILE_SHARE_READ
5277                                               | FILE_SHARE_WRITE
5278                                               | FILE_SHARE_DELETE,
5279                                               base_create_disposition,
5280                                               0, 0, 0, NULL, 0,
5281                                               base_privflags,
5282                                               NULL, NULL,
5283                                               &base_fsp, NULL);
5284                 TALLOC_FREE(smb_fname_base);
5285
5286                 if (!NT_STATUS_IS_OK(status)) {
5287                         DEBUG(10, ("create_file_unixpath for base %s failed: "
5288                                    "%s\n", smb_fname->base_name,
5289                                    nt_errstr(status)));
5290                         goto fail;
5291                 }
5292                 /* we don't need the low level fd */
5293                 fd_close(base_fsp);
5294         }
5295
5296         /*
5297          * If it's a request for a directory open, deal with it separately.
5298          */
5299
5300         if (create_options & FILE_DIRECTORY_FILE) {
5301
5302                 if (create_options & FILE_NON_DIRECTORY_FILE) {
5303                         status = NT_STATUS_INVALID_PARAMETER;
5304                         goto fail;
5305                 }
5306
5307                 /* Can't open a temp directory. IFS kit test. */
5308                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
5309                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
5310                         status = NT_STATUS_INVALID_PARAMETER;
5311                         goto fail;
5312                 }
5313
5314                 /*
5315                  * We will get a create directory here if the Win32
5316                  * app specified a security descriptor in the
5317                  * CreateDirectory() call.
5318                  */
5319
5320                 oplock_request = 0;
5321                 status = open_directory(
5322                         conn, req, smb_fname, access_mask, share_access,
5323                         create_disposition, create_options, file_attributes,
5324                         &info, &fsp);
5325         } else {
5326
5327                 /*
5328                  * Ordinary file case.
5329                  */
5330
5331                 status = file_new(req, conn, &fsp);
5332                 if(!NT_STATUS_IS_OK(status)) {
5333                         goto fail;
5334                 }
5335
5336                 status = fsp_set_smb_fname(fsp, smb_fname);
5337                 if (!NT_STATUS_IS_OK(status)) {
5338                         goto fail;
5339                 }
5340
5341                 if (base_fsp) {
5342                         /*
5343                          * We're opening the stream element of a
5344                          * base_fsp we already opened. Set up the
5345                          * base_fsp pointer.
5346                          */
5347                         fsp->base_fsp = base_fsp;
5348                 }
5349
5350                 if (allocation_size) {
5351                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
5352                                                         allocation_size);
5353                 }
5354
5355                 status = open_file_ntcreate(conn,
5356                                             req,
5357                                             access_mask,
5358                                             share_access,
5359                                             create_disposition,
5360                                             create_options,
5361                                             file_attributes,
5362                                             oplock_request,
5363                                             lease,
5364                                             private_flags,
5365                                             &info,
5366                                             fsp);
5367
5368                 if(!NT_STATUS_IS_OK(status)) {
5369                         file_free(req, fsp);
5370                         fsp = NULL;
5371                 }
5372
5373                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
5374
5375                         /* A stream open never opens a directory */
5376
5377                         if (base_fsp) {
5378                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5379                                 goto fail;
5380                         }
5381
5382                         /*
5383                          * Fail the open if it was explicitly a non-directory
5384                          * file.
5385                          */
5386
5387                         if (create_options & FILE_NON_DIRECTORY_FILE) {
5388                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
5389                                 goto fail;
5390                         }
5391
5392                         oplock_request = 0;
5393                         status = open_directory(
5394                                 conn, req, smb_fname, access_mask,
5395                                 share_access, create_disposition,
5396                                 create_options, file_attributes,
5397                                 &info, &fsp);
5398                 }
5399         }
5400
5401         if (!NT_STATUS_IS_OK(status)) {
5402                 goto fail;
5403         }
5404
5405         fsp->base_fsp = base_fsp;
5406
5407         if ((ea_list != NULL) &&
5408             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
5409                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
5410                 if (!NT_STATUS_IS_OK(status)) {
5411                         goto fail;
5412                 }
5413         }
5414
5415         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
5416                 status = NT_STATUS_ACCESS_DENIED;
5417                 goto fail;
5418         }
5419
5420         /* Save the requested allocation size. */
5421         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
5422                 if ((allocation_size > fsp->fsp_name->st.st_ex_size)
5423                     && !(fsp->is_directory))
5424                 {
5425                         fsp->initial_allocation_size = smb_roundup(
5426                                 fsp->conn, allocation_size);
5427                         if (vfs_allocate_file_space(
5428                                     fsp, fsp->initial_allocation_size) == -1) {
5429                                 status = NT_STATUS_DISK_FULL;
5430                                 goto fail;
5431                         }
5432                 } else {
5433                         fsp->initial_allocation_size = smb_roundup(
5434                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
5435                 }
5436         } else {
5437                 fsp->initial_allocation_size = 0;
5438         }
5439
5440         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
5441                                 fsp->base_fsp == NULL) {
5442                 if (sd != NULL) {
5443                         /*
5444                          * According to the MS documentation, the only time the security
5445                          * descriptor is applied to the opened file is iff we *created* the
5446                          * file; an existing file stays the same.
5447                          *
5448                          * Also, it seems (from observation) that you can open the file with
5449                          * any access mask but you can still write the sd. We need to override
5450                          * the granted access before we call set_sd
5451                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
5452                          */
5453
5454                         uint32_t sec_info_sent;
5455                         uint32_t saved_access_mask = fsp->access_mask;
5456
5457                         sec_info_sent = get_sec_info(sd);
5458
5459                         fsp->access_mask = FILE_GENERIC_ALL;
5460
5461                         if (sec_info_sent & (SECINFO_OWNER|
5462                                                 SECINFO_GROUP|
5463                                                 SECINFO_DACL|
5464                                                 SECINFO_SACL)) {
5465                                 status = set_sd(fsp, sd, sec_info_sent);
5466                         }
5467
5468                         fsp->access_mask = saved_access_mask;
5469
5470                         if (!NT_STATUS_IS_OK(status)) {
5471                                 goto fail;
5472                         }
5473                 } else if (lp_inherit_acls(SNUM(conn))) {
5474                         /* Inherit from parent. Errors here are not fatal. */
5475                         status = inherit_new_acl(fsp);
5476                         if (!NT_STATUS_IS_OK(status)) {
5477                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
5478                                         fsp_str_dbg(fsp),
5479                                         nt_errstr(status) ));
5480                         }
5481                 }
5482         }
5483
5484         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
5485          && (create_options & FILE_NO_COMPRESSION)
5486          && (info == FILE_WAS_CREATED)) {
5487                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
5488                                                  COMPRESSION_FORMAT_NONE);
5489                 if (!NT_STATUS_IS_OK(status)) {
5490                         DEBUG(1, ("failed to disable compression: %s\n",
5491                                   nt_errstr(status)));
5492                 }
5493         }
5494
5495         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
5496
5497         *result = fsp;
5498         if (pinfo != NULL) {
5499                 *pinfo = info;
5500         }
5501
5502         smb_fname->st = fsp->fsp_name->st;
5503
5504         return NT_STATUS_OK;
5505
5506  fail:
5507         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
5508
5509         if (fsp != NULL) {
5510                 if (base_fsp && fsp->base_fsp == base_fsp) {
5511                         /*
5512                          * The close_file below will close
5513                          * fsp->base_fsp.
5514                          */
5515                         base_fsp = NULL;
5516                 }
5517                 close_file(req, fsp, ERROR_CLOSE);
5518                 fsp = NULL;
5519         }
5520         if (base_fsp != NULL) {
5521                 close_file(req, base_fsp, ERROR_CLOSE);
5522                 base_fsp = NULL;
5523         }
5524         return status;
5525 }
5526
5527 /*
5528  * Calculate the full path name given a relative fid.
5529  */
5530 NTSTATUS get_relative_fid_filename(connection_struct *conn,
5531                                    struct smb_request *req,
5532                                    uint16_t root_dir_fid,
5533                                    const struct smb_filename *smb_fname,
5534                                    struct smb_filename **smb_fname_out)
5535 {
5536         files_struct *dir_fsp;
5537         char *parent_fname = NULL;
5538         char *new_base_name = NULL;
5539         uint32_t ucf_flags = ucf_flags_from_smb_request(req);
5540         NTSTATUS status;
5541
5542         if (root_dir_fid == 0 || !smb_fname) {
5543                 status = NT_STATUS_INTERNAL_ERROR;
5544                 goto out;
5545         }
5546
5547         dir_fsp = file_fsp(req, root_dir_fid);
5548
5549         if (dir_fsp == NULL) {
5550                 status = NT_STATUS_INVALID_HANDLE;
5551                 goto out;
5552         }
5553
5554         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
5555                 status = NT_STATUS_INVALID_HANDLE;
5556                 goto out;
5557         }
5558
5559         if (!dir_fsp->is_directory) {
5560
5561                 /*
5562                  * Check to see if this is a mac fork of some kind.
5563                  */
5564
5565                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
5566                     is_ntfs_stream_smb_fname(smb_fname)) {
5567                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
5568                         goto out;
5569                 }
5570
5571                 /*
5572                   we need to handle the case when we get a
5573                   relative open relative to a file and the
5574                   pathname is blank - this is a reopen!
5575                   (hint from demyn plantenberg)
5576                 */
5577
5578                 status = NT_STATUS_INVALID_HANDLE;
5579                 goto out;
5580         }
5581
5582         if (ISDOT(dir_fsp->fsp_name->base_name)) {
5583                 /*
5584                  * We're at the toplevel dir, the final file name
5585                  * must not contain ./, as this is filtered out
5586                  * normally by srvstr_get_path and unix_convert
5587                  * explicitly rejects paths containing ./.
5588                  */
5589                 parent_fname = talloc_strdup(talloc_tos(), "");
5590                 if (parent_fname == NULL) {
5591                         status = NT_STATUS_NO_MEMORY;
5592                         goto out;
5593                 }
5594         } else {
5595                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
5596
5597                 /*
5598                  * Copy in the base directory name.
5599                  */
5600
5601                 parent_fname = talloc_array(talloc_tos(), char,
5602                     dir_name_len+2);
5603                 if (parent_fname == NULL) {
5604                         status = NT_STATUS_NO_MEMORY;
5605                         goto out;
5606                 }
5607                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
5608                     dir_name_len+1);
5609
5610                 /*
5611                  * Ensure it ends in a '/'.
5612                  * We used TALLOC_SIZE +2 to add space for the '/'.
5613                  */
5614
5615                 if(dir_name_len
5616                     && (parent_fname[dir_name_len-1] != '\\')
5617                     && (parent_fname[dir_name_len-1] != '/')) {
5618                         parent_fname[dir_name_len] = '/';
5619                         parent_fname[dir_name_len+1] = '\0';
5620                 }
5621         }
5622
5623         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
5624                                         smb_fname->base_name);
5625         if (new_base_name == NULL) {
5626                 status = NT_STATUS_NO_MEMORY;
5627                 goto out;
5628         }
5629
5630         status = filename_convert(req,
5631                                 conn,
5632                                 new_base_name,
5633                                 ucf_flags,
5634                                 NULL,
5635                                 NULL,
5636                                 smb_fname_out);
5637         if (!NT_STATUS_IS_OK(status)) {
5638                 goto out;
5639         }
5640
5641  out:
5642         TALLOC_FREE(parent_fname);
5643         TALLOC_FREE(new_base_name);
5644         return status;
5645 }
5646
5647 NTSTATUS create_file_default(connection_struct *conn,
5648                              struct smb_request *req,
5649                              uint16_t root_dir_fid,
5650                              struct smb_filename *smb_fname,
5651                              uint32_t access_mask,
5652                              uint32_t share_access,
5653                              uint32_t create_disposition,
5654                              uint32_t create_options,
5655                              uint32_t file_attributes,
5656                              uint32_t oplock_request,
5657                              struct smb2_lease *lease,
5658                              uint64_t allocation_size,
5659                              uint32_t private_flags,
5660                              struct security_descriptor *sd,
5661                              struct ea_list *ea_list,
5662                              files_struct **result,
5663                              int *pinfo,
5664                              const struct smb2_create_blobs *in_context_blobs,
5665                              struct smb2_create_blobs *out_context_blobs)
5666 {
5667         int info = FILE_WAS_OPENED;
5668         files_struct *fsp = NULL;
5669         NTSTATUS status;
5670         bool stream_name = false;
5671
5672         DBG_DEBUG("create_file: access_mask = 0x%x "
5673                   "file_attributes = 0x%x, share_access = 0x%x, "
5674                   "create_disposition = 0x%x create_options = 0x%x "
5675                   "oplock_request = 0x%x "
5676                   "private_flags = 0x%x "
5677                   "root_dir_fid = 0x%x, ea_list = %p, sd = %p, "
5678                   "fname = %s\n",
5679                   (unsigned int)access_mask,
5680                   (unsigned int)file_attributes,
5681                   (unsigned int)share_access,
5682                   (unsigned int)create_disposition,
5683                   (unsigned int)create_options,
5684                   (unsigned int)oplock_request,
5685                   (unsigned int)private_flags,
5686                   (unsigned int)root_dir_fid,
5687                   ea_list, sd, smb_fname_str_dbg(smb_fname));
5688
5689         /*
5690          * Calculate the filename from the root_dir_if if necessary.
5691          */
5692
5693         if (root_dir_fid != 0) {
5694                 struct smb_filename *smb_fname_out = NULL;
5695                 status = get_relative_fid_filename(conn, req, root_dir_fid,
5696                                                    smb_fname, &smb_fname_out);
5697                 if (!NT_STATUS_IS_OK(status)) {
5698                         goto fail;
5699                 }
5700                 smb_fname = smb_fname_out;
5701         }
5702
5703         /*
5704          * Check to see if this is a mac fork of some kind.
5705          */
5706
5707         stream_name = is_ntfs_stream_smb_fname(smb_fname);
5708         if (stream_name) {
5709                 enum FAKE_FILE_TYPE fake_file_type;
5710
5711                 fake_file_type = is_fake_file(smb_fname);
5712
5713                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
5714
5715                         /*
5716                          * Here we go! support for changing the disk quotas
5717                          * --metze
5718                          *
5719                          * We need to fake up to open this MAGIC QUOTA file
5720                          * and return a valid FID.
5721                          *
5722                          * w2k close this file directly after openening xp
5723                          * also tries a QUERY_FILE_INFO on the file and then
5724                          * close it
5725                          */
5726                         status = open_fake_file(req, conn, req->vuid,
5727                                                 fake_file_type, smb_fname,
5728                                                 access_mask, &fsp);
5729                         if (!NT_STATUS_IS_OK(status)) {
5730                                 goto fail;
5731                         }
5732
5733                         ZERO_STRUCT(smb_fname->st);
5734                         goto done;
5735                 }
5736
5737                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
5738                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
5739                         goto fail;
5740                 }
5741         }
5742
5743         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5744                 int ret;
5745                 smb_fname->stream_name = NULL;
5746                 /* We have to handle this error here. */
5747                 if (create_options & FILE_DIRECTORY_FILE) {
5748                         status = NT_STATUS_NOT_A_DIRECTORY;
5749                         goto fail;
5750                 }
5751                 if (req != NULL && req->posix_pathnames) {
5752                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5753                 } else {
5754                         ret = SMB_VFS_STAT(conn, smb_fname);
5755                 }
5756
5757                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5758                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5759                         goto fail;
5760                 }
5761         }
5762
5763         status = create_file_unixpath(
5764                 conn, req, smb_fname, access_mask, share_access,
5765                 create_disposition, create_options, file_attributes,
5766                 oplock_request, lease, allocation_size, private_flags,
5767                 sd, ea_list,
5768                 &fsp, &info);
5769
5770         if (!NT_STATUS_IS_OK(status)) {
5771                 goto fail;
5772         }
5773
5774  done:
5775         DEBUG(10, ("create_file: info=%d\n", info));
5776
5777         *result = fsp;
5778         if (pinfo != NULL) {
5779                 *pinfo = info;
5780         }
5781         return NT_STATUS_OK;
5782
5783  fail:
5784         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5785
5786         if (fsp != NULL) {
5787                 close_file(req, fsp, ERROR_CLOSE);
5788                 fsp = NULL;
5789         }
5790         return status;
5791 }