source3/smbd/open.c

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