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
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/filesys.h"
  24 #include "printing.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "fake_file.h"
  28 #include "../libcli/security/security.h"
  29 #include "../librpc/gen_ndr/ndr_security.h"
  30 #include "../librpc/gen_ndr/open_files.h"
  31 #include "../librpc/gen_ndr/idmap.h"
  32 #include "../librpc/gen_ndr/ioctl.h"
  33 #include "passdb/lookup_sid.h"
  34 #include "auth.h"
  35 #include "serverid.h"
  36 #include "messages.h"
  37 #include "source3/lib/dbwrap/dbwrap_watch.h"
  38 #include "locking/leases_db.h"
  39 #include "librpc/gen_ndr/ndr_leases_db.h"
  40
  41 extern const struct generic_mapping file_generic_mapping;
  42
  43 struct deferred_open_record {
  44         bool delayed_for_oplocks;
  45         bool async_open;
  46         struct file_id id;
  47 };
  48
  49 /****************************************************************************
  50  If the requester wanted DELETE_ACCESS and was rejected because
  51  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  52  overrides this.
  53 ****************************************************************************/
  54
  55 static bool parent_override_delete(connection_struct *conn,
  56                                         const struct smb_filename *smb_fname,
  57                                         uint32_t access_mask,
  58                                         uint32_t rejected_mask)
  59 {
  60         if ((access_mask & DELETE_ACCESS) &&
  61                     (rejected_mask & DELETE_ACCESS) &&
  62                     can_delete_file_in_directory(conn, smb_fname)) {
  63                 return true;
  64         }
  65         return false;
  66 }
  67
  68 /****************************************************************************
  69  Check if we have open rights.
  70 ****************************************************************************/
  71
  72 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  73                                 const struct smb_filename *smb_fname,
  74                                 bool use_privs,
  75                                 uint32_t access_mask)
  76 {
  77         /* Check if we have rights to open. */
  78         NTSTATUS status;
  79         struct security_descriptor *sd = NULL;
  80         uint32_t rejected_share_access;
  81         uint32_t rejected_mask = access_mask;
  82         uint32_t do_not_check_mask = 0;
  83
  84         rejected_share_access = access_mask & ~(conn->share_access);
  85
  86         if (rejected_share_access) {
  87                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  88                         "on %s (0x%x)\n",
  89                         (unsigned int)access_mask,
  90                         smb_fname_str_dbg(smb_fname),
  91                         (unsigned int)rejected_share_access ));
  92                 return NT_STATUS_ACCESS_DENIED;
  93         }
  94
  95         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
  96                 /* I'm sorry sir, I didn't know you were root... */
  97                 DEBUG(10,("smbd_check_access_rights: root override "
  98                         "on %s. Granting 0x%x\n",
  99                         smb_fname_str_dbg(smb_fname),
 100                         (unsigned int)access_mask ));
 101                 return NT_STATUS_OK;
 102         }
 103
 104         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 105                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 106                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 107                         smb_fname_str_dbg(smb_fname),
 108                         (unsigned int)access_mask ));
 109                 return NT_STATUS_OK;
 110         }
 111
 112         if (access_mask == DELETE_ACCESS &&
 113                         VALID_STAT(smb_fname->st) &&
 114                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 115                 /* We can always delete a symlink. */
 116                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 117                         "on DELETE_ACCESS on symlink %s.\n",
 118                         smb_fname_str_dbg(smb_fname) ));
 119                 return NT_STATUS_OK;
 120         }
 121
 122         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
 123                         (SECINFO_OWNER |
 124                         SECINFO_GROUP |
 125                          SECINFO_DACL), talloc_tos(), &sd);
 126
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 129                         "on %s: %s\n",
 130                         smb_fname_str_dbg(smb_fname),
 131                         nt_errstr(status)));
 132
 133                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 134                         goto access_denied;
 135                 }
 136
 137                 return status;
 138         }
 139
 140         /*
 141          * If we can access the path to this file, by
 142          * default we have FILE_READ_ATTRIBUTES from the
 143          * containing directory. See the section:
 144          * "Algorithm to Check Access to an Existing File"
 145          * in MS-FSA.pdf.
 146          *
 147          * se_file_access_check() also takes care of
 148          * owner WRITE_DAC and READ_CONTROL.
 149          */
 150         do_not_check_mask = FILE_READ_ATTRIBUTES;
 151
 152         /*
 153          * Samba 3.6 and earlier granted execute access even
 154          * if the ACL did not contain execute rights.
 155          * Samba 4.0 is more correct and checks it.
 156          * The compatibilty mode allows to skip this check
 157          * to smoothen upgrades.
 158          */
 159         if (lp_acl_allow_execute_always(SNUM(conn))) {
 160                 do_not_check_mask |= FILE_EXECUTE;
 161         }
 162
 163         status = se_file_access_check(sd,
 164                                 get_current_nttok(conn),
 165                                 use_privs,
 166                                 (access_mask & ~do_not_check_mask),
 167                                 &rejected_mask);
 168
 169         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 170                 "0x%x returning 0x%x (%s)\n",
 171                 smb_fname_str_dbg(smb_fname),
 172                 (unsigned int)access_mask,
 173                 (unsigned int)rejected_mask,
 174                 nt_errstr(status) ));
 175
 176         if (!NT_STATUS_IS_OK(status)) {
 177                 if (DEBUGLEVEL >= 10) {
 178                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 179                                 smb_fname_str_dbg(smb_fname) ));
 180                         NDR_PRINT_DEBUG(security_descriptor, sd);
 181                 }
 182         }
 183
 184         TALLOC_FREE(sd);
 185
 186         if (NT_STATUS_IS_OK(status) ||
 187                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 188                 return status;
 189         }
 190
 191         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 192
 193   access_denied:
 194
 195         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 196                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 197                         !lp_store_dos_attributes(SNUM(conn)) &&
 198                         (lp_map_readonly(SNUM(conn)) ||
 199                         lp_map_archive(SNUM(conn)) ||
 200                         lp_map_hidden(SNUM(conn)) ||
 201                         lp_map_system(SNUM(conn)))) {
 202                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 203
 204                 DEBUG(10,("smbd_check_access_rights: "
 205                         "overrode "
 206                         "FILE_WRITE_ATTRIBUTES "
 207                         "on file %s\n",
 208                         smb_fname_str_dbg(smb_fname)));
 209         }
 210
 211         if (parent_override_delete(conn,
 212                                 smb_fname,
 213                                 access_mask,
 214                                 rejected_mask)) {
 215                 /* Were we trying to do an open
 216                  * for delete and didn't get DELETE
 217                  * access (only) ? Check if the
 218                  * directory allows DELETE_CHILD.
 219                  * See here:
 220                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 221                  * for details. */
 222
 223                 rejected_mask &= ~DELETE_ACCESS;
 224
 225                 DEBUG(10,("smbd_check_access_rights: "
 226                         "overrode "
 227                         "DELETE_ACCESS on "
 228                         "file %s\n",
 229                         smb_fname_str_dbg(smb_fname)));
 230         }
 231
 232         if (rejected_mask != 0) {
 233                 return NT_STATUS_ACCESS_DENIED;
 234         }
 235         return NT_STATUS_OK;
 236 }
 237
 238 static NTSTATUS check_parent_access(struct connection_struct *conn,
 239                                 struct smb_filename *smb_fname,
 240                                 uint32_t access_mask)
 241 {
 242         NTSTATUS status;
 243         char *parent_dir = NULL;
 244         struct security_descriptor *parent_sd = NULL;
 245         uint32_t access_granted = 0;
 246
 247         if (!parent_dirname(talloc_tos(),
 248                                 smb_fname->base_name,
 249                                 &parent_dir,
 250                                 NULL)) {
 251                 return NT_STATUS_NO_MEMORY;
 252         }
 253
 254         if (get_current_uid(conn) == (uid_t)0) {
 255                 /* I'm sorry sir, I didn't know you were root... */
 256                 DEBUG(10,("check_parent_access: root override "
 257                         "on %s. Granting 0x%x\n",
 258                         smb_fname_str_dbg(smb_fname),
 259                         (unsigned int)access_mask ));
 260                 return NT_STATUS_OK;
 261         }
 262
 263         status = SMB_VFS_GET_NT_ACL(conn,
 264                                 parent_dir,
 265                                 SECINFO_DACL,
 266                                     talloc_tos(),
 267                                 &parent_sd);
 268
 269         if (!NT_STATUS_IS_OK(status)) {
 270                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 271                         "%s with error %s\n",
 272                         parent_dir,
 273                         nt_errstr(status)));
 274                 return status;
 275         }
 276
 277         /*
 278          * If we can access the path to this file, by
 279          * default we have FILE_READ_ATTRIBUTES from the
 280          * containing directory. See the section:
 281          * "Algorithm to Check Access to an Existing File"
 282          * in MS-FSA.pdf.
 283          *
 284          * se_file_access_check() also takes care of
 285          * owner WRITE_DAC and READ_CONTROL.
 286          */
 287         status = se_file_access_check(parent_sd,
 288                                 get_current_nttok(conn),
 289                                 false,
 290                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 291                                 &access_granted);
 292         if(!NT_STATUS_IS_OK(status)) {
 293                 DEBUG(5,("check_parent_access: access check "
 294                         "on directory %s for "
 295                         "path %s for mask 0x%x returned (0x%x) %s\n",
 296                         parent_dir,
 297                         smb_fname->base_name,
 298                         access_mask,
 299                         access_granted,
 300                         nt_errstr(status) ));
 301                 return status;
 302         }
 303
 304         return NT_STATUS_OK;
 305 }
 306
 307 /****************************************************************************
 308  Ensure when opening a base file for a stream open that we have permissions
 309  to do so given the access mask on the base file.
 310 ****************************************************************************/
 311
 312 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 313                                 struct smb_filename *smb_fname,
 314                                 uint32_t access_mask)
 315 {
 316         NTSTATUS status;
 317
 318         status = smbd_calculate_access_mask(conn, smb_fname,
 319                                         false,
 320                                         access_mask,
 321                                         &access_mask);
 322         if (!NT_STATUS_IS_OK(status)) {
 323                 DEBUG(10, ("smbd_calculate_access_mask "
 324                         "on file %s returned %s\n",
 325                         smb_fname_str_dbg(smb_fname),
 326                         nt_errstr(status)));
 327                 return status;
 328         }
 329
 330         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 331                 uint32_t dosattrs;
 332                 if (!CAN_WRITE(conn)) {
 333                         return NT_STATUS_ACCESS_DENIED;
 334                 }
 335                 dosattrs = dos_mode(conn, smb_fname);
 336                 if (IS_DOS_READONLY(dosattrs)) {
 337                         return NT_STATUS_ACCESS_DENIED;
 338                 }
 339         }
 340
 341         return smbd_check_access_rights(conn,
 342                                         smb_fname,
 343                                         false,
 344                                         access_mask);
 345 }
 346
 347 /****************************************************************************
 348  fd support routines - attempt to do a dos_open.
 349 ****************************************************************************/
 350
 351 NTSTATUS fd_open(struct connection_struct *conn,
 352                  files_struct *fsp,
 353                  int flags,
 354                  mode_t mode)
 355 {
 356         struct smb_filename *smb_fname = fsp->fsp_name;
 357         NTSTATUS status = NT_STATUS_OK;
 358
 359 #ifdef O_NOFOLLOW
 360         /*
 361          * Never follow symlinks on a POSIX client. The
 362          * client should be doing this.
 363          */
 364
 365         if (fsp->posix_open || !lp_follow_symlinks(SNUM(conn))) {
 366                 flags |= O_NOFOLLOW;
 367         }
 368 #endif
 369
 370         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 371         if (fsp->fh->fd == -1) {
 372                 int posix_errno = errno;
 373 #ifdef O_NOFOLLOW
 374 #if defined(ENOTSUP) && defined(OSF1)
 375                 /* handle special Tru64 errno */
 376                 if (errno == ENOTSUP) {
 377                         posix_errno = ELOOP;
 378                 }
 379 #endif /* ENOTSUP */
 380 #ifdef EFTYPE
 381                 /* fix broken NetBSD errno */
 382                 if (errno == EFTYPE) {
 383                         posix_errno = ELOOP;
 384                 }
 385 #endif /* EFTYPE */
 386                 /* fix broken FreeBSD errno */
 387                 if (errno == EMLINK) {
 388                         posix_errno = ELOOP;
 389                 }
 390 #endif /* O_NOFOLLOW */
 391                 status = map_nt_error_from_unix(posix_errno);
 392                 if (errno == EMFILE) {
 393                         static time_t last_warned = 0L;
 394
 395                         if (time((time_t *) NULL) > last_warned) {
 396                                 DEBUG(0,("Too many open files, unable "
 397                                         "to open more!  smbd's max "
 398                                         "open files = %d\n",
 399                                         lp_max_open_files()));
 400                                 last_warned = time((time_t *) NULL);
 401                         }
 402                 }
 403
 404         }
 405
 406         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 407                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 408                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 409
 410         return status;
 411 }
 412
 413 /****************************************************************************
 414  Close the file associated with a fsp.
 415 ****************************************************************************/
 416
 417 NTSTATUS fd_close(files_struct *fsp)
 418 {
 419         int ret;
 420
 421         if (fsp->dptr) {
 422                 dptr_CloseDir(fsp);
 423         }
 424         if (fsp->fh->fd == -1) {
 425                 return NT_STATUS_OK; /* What we used to call a stat open. */
 426         }
 427         if (fsp->fh->ref_count > 1) {
 428                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 429         }
 430
 431         ret = SMB_VFS_CLOSE(fsp);
 432         fsp->fh->fd = -1;
 433         if (ret == -1) {
 434                 return map_nt_error_from_unix(errno);
 435         }
 436         return NT_STATUS_OK;
 437 }
 438
 439 /****************************************************************************
 440  Change the ownership of a file to that of the parent directory.
 441  Do this by fd if possible.
 442 ****************************************************************************/
 443
 444 void change_file_owner_to_parent(connection_struct *conn,
 445                                         const char *inherit_from_dir,
 446                                         files_struct *fsp)
 447 {
 448         struct smb_filename *smb_fname_parent;
 449         int ret;
 450
 451         smb_fname_parent = synthetic_smb_fname(talloc_tos(), inherit_from_dir,
 452                                                NULL, NULL);
 453         if (smb_fname_parent == NULL) {
 454                 return;
 455         }
 456
 457         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 458         if (ret == -1) {
 459                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 460                          "directory %s. Error was %s\n",
 461                          smb_fname_str_dbg(smb_fname_parent),
 462                          strerror(errno)));
 463                 TALLOC_FREE(smb_fname_parent);
 464                 return;
 465         }
 466
 467         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 468                 /* Already this uid - no need to change. */
 469                 DEBUG(10,("change_file_owner_to_parent: file %s "
 470                         "is already owned by uid %d\n",
 471                         fsp_str_dbg(fsp),
 472                         (int)fsp->fsp_name->st.st_ex_uid ));
 473                 TALLOC_FREE(smb_fname_parent);
 474                 return;
 475         }
 476
 477         become_root();
 478         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 479         unbecome_root();
 480         if (ret == -1) {
 481                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 482                          "file %s to parent directory uid %u. Error "
 483                          "was %s\n", fsp_str_dbg(fsp),
 484                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 485                          strerror(errno) ));
 486         } else {
 487                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 488                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 489                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 490                 /* Ensure the uid entry is updated. */
 491                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 492         }
 493
 494         TALLOC_FREE(smb_fname_parent);
 495 }
 496
 497 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 498                                        const char *inherit_from_dir,
 499                                        const char *fname,
 500                                        SMB_STRUCT_STAT *psbuf)
 501 {
 502         struct smb_filename *smb_fname_parent;
 503         struct smb_filename *smb_fname_cwd = NULL;
 504         char *saved_dir = NULL;
 505         TALLOC_CTX *ctx = talloc_tos();
 506         NTSTATUS status = NT_STATUS_OK;
 507         int ret;
 508
 509         smb_fname_parent = synthetic_smb_fname(ctx, inherit_from_dir,
 510                                                NULL, NULL);
 511         if (smb_fname_parent == NULL) {
 512                 return NT_STATUS_NO_MEMORY;
 513         }
 514
 515         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 516         if (ret == -1) {
 517                 status = map_nt_error_from_unix(errno);
 518                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 519                          "directory %s. Error was %s\n",
 520                          smb_fname_str_dbg(smb_fname_parent),
 521                          strerror(errno)));
 522                 goto out;
 523         }
 524
 525         /* We've already done an lstat into psbuf, and we know it's a
 526            directory. If we can cd into the directory and the dev/ino
 527            are the same then we can safely chown without races as
 528            we're locking the directory in place by being in it.  This
 529            should work on any UNIX (thanks tridge :-). JRA.
 530         */
 531
 532         saved_dir = vfs_GetWd(ctx,conn);
 533         if (!saved_dir) {
 534                 status = map_nt_error_from_unix(errno);
 535                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 536                          "current working directory. Error was %s\n",
 537                          strerror(errno)));
 538                 goto out;
 539         }
 540
 541         /* Chdir into the new path. */
 542         if (vfs_ChDir(conn, fname) == -1) {
 543                 status = map_nt_error_from_unix(errno);
 544                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 545                          "current working directory to %s. Error "
 546                          "was %s\n", fname, strerror(errno) ));
 547                 goto chdir;
 548         }
 549
 550         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL);
 551         if (smb_fname_cwd == NULL) {
 552                 status = NT_STATUS_NO_MEMORY;
 553                 goto chdir;
 554         }
 555
 556         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 557         if (ret == -1) {
 558                 status = map_nt_error_from_unix(errno);
 559                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 560                          "directory '.' (%s) Error was %s\n",
 561                          fname, strerror(errno)));
 562                 goto chdir;
 563         }
 564
 565         /* Ensure we're pointing at the same place. */
 566         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 567             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 568                 DEBUG(0,("change_dir_owner_to_parent: "
 569                          "device/inode on directory %s changed. "
 570                          "Refusing to chown !\n", fname ));
 571                 status = NT_STATUS_ACCESS_DENIED;
 572                 goto chdir;
 573         }
 574
 575         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 576                 /* Already this uid - no need to change. */
 577                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 578                         "is already owned by uid %d\n",
 579                         fname,
 580                         (int)smb_fname_cwd->st.st_ex_uid ));
 581                 status = NT_STATUS_OK;
 582                 goto chdir;
 583         }
 584
 585         become_root();
 586         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
 587                             (gid_t)-1);
 588         unbecome_root();
 589         if (ret == -1) {
 590                 status = map_nt_error_from_unix(errno);
 591                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
 592                           "directory %s to parent directory uid %u. "
 593                           "Error was %s\n", fname,
 594                           (unsigned int)smb_fname_parent->st.st_ex_uid,
 595                           strerror(errno) ));
 596         } else {
 597                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
 598                         "directory %s to parent directory uid %u.\n",
 599                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
 600                 /* Ensure the uid entry is updated. */
 601                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
 602         }
 603
 604  chdir:
 605         vfs_ChDir(conn,saved_dir);
 606  out:
 607         TALLOC_FREE(smb_fname_parent);
 608         TALLOC_FREE(smb_fname_cwd);
 609         return status;
 610 }
 611
 612 /****************************************************************************
 613  Open a file - returning a guaranteed ATOMIC indication of if the
 614  file was created or not.
 615 ****************************************************************************/
 616
 617 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
 618                         files_struct *fsp,
 619                         int flags,
 620                         mode_t mode,
 621                         bool *file_created)
 622 {
 623         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 624         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 625
 626         *file_created = false;
 627
 628         if (!(flags & O_CREAT)) {
 629                 /*
 630                  * We're not creating the file, just pass through.
 631                  */
 632                 return fd_open(conn, fsp, flags, mode);
 633         }
 634
 635         if (flags & O_EXCL) {
 636                 /*
 637                  * Fail if already exists, just pass through.
 638                  */
 639                 status = fd_open(conn, fsp, flags, mode);
 640
 641                 /*
 642                  * Here we've opened with O_CREAT|O_EXCL. If that went
 643                  * NT_STATUS_OK, we *know* we created this file.
 644                  */
 645                 *file_created = NT_STATUS_IS_OK(status);
 646
 647                 return status;
 648         }
 649
 650         /*
 651          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
 652          * To know absolutely if we created the file or not,
 653          * we can never call O_CREAT without O_EXCL. So if
 654          * we think the file existed, try without O_CREAT|O_EXCL.
 655          * If we think the file didn't exist, try with
 656          * O_CREAT|O_EXCL. Keep bouncing between these two
 657          * requests until either the file is created, or
 658          * opened. Either way, we keep going until we get
 659          * a returnable result (error, or open/create).
 660          */
 661
 662         while(1) {
 663                 int curr_flags = flags;
 664
 665                 if (file_existed) {
 666                         /* Just try open, do not create. */
 667                         curr_flags &= ~(O_CREAT);
 668                         status = fd_open(conn, fsp, curr_flags, mode);
 669                         if (NT_STATUS_EQUAL(status,
 670                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 671                                 /*
 672                                  * Someone deleted it in the meantime.
 673                                  * Retry with O_EXCL.
 674                                  */
 675                                 file_existed = false;
 676                                 DEBUG(10,("fd_open_atomic: file %s existed. "
 677                                         "Retry.\n",
 678                                         smb_fname_str_dbg(fsp->fsp_name)));
 679                                         continue;
 680                         }
 681                 } else {
 682                         /* Try create exclusively, fail if it exists. */
 683                         curr_flags |= O_EXCL;
 684                         status = fd_open(conn, fsp, curr_flags, mode);
 685                         if (NT_STATUS_EQUAL(status,
 686                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
 687                                 /*
 688                                  * Someone created it in the meantime.
 689                                  * Retry without O_CREAT.
 690                                  */
 691                                 file_existed = true;
 692                                 DEBUG(10,("fd_open_atomic: file %s "
 693                                         "did not exist. Retry.\n",
 694                                         smb_fname_str_dbg(fsp->fsp_name)));
 695                                 continue;
 696                         }
 697                         if (NT_STATUS_IS_OK(status)) {
 698                                 /*
 699                                  * Here we've opened with O_CREAT|O_EXCL
 700                                  * and got success. We *know* we created
 701                                  * this file.
 702                                  */
 703                                 *file_created = true;
 704                         }
 705                 }
 706                 /* Create is done, or failed. */
 707                 break;
 708         }
 709         return status;
 710 }
 711
 712 /****************************************************************************
 713  Open a file.
 714 ****************************************************************************/
 715
 716 static NTSTATUS open_file(files_struct *fsp,
 717                           connection_struct *conn,
 718                           struct smb_request *req,
 719                           const char *parent_dir,
 720                           int flags,
 721                           mode_t unx_mode,
 722                           uint32 access_mask, /* client requested access mask. */
 723                           uint32 open_access_mask, /* what we're actually using in the open. */
 724                           bool *p_file_created)
 725 {
 726         struct smb_filename *smb_fname = fsp->fsp_name;
 727         NTSTATUS status = NT_STATUS_OK;
 728         int accmode = (flags & O_ACCMODE);
 729         int local_flags = flags;
 730         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 731
 732         fsp->fh->fd = -1;
 733         errno = EPERM;
 734
 735         /* Check permissions */
 736
 737         /*
 738          * This code was changed after seeing a client open request
 739          * containing the open mode of (DENY_WRITE/read-only) with
 740          * the 'create if not exist' bit set. The previous code
 741          * would fail to open the file read only on a read-only share
 742          * as it was checking the flags parameter  directly against O_RDONLY,
 743          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
 744          * JRA.
 745          */
 746
 747         if (!CAN_WRITE(conn)) {
 748                 /* It's a read-only share - fail if we wanted to write. */
 749                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
 750                         DEBUG(3,("Permission denied opening %s\n",
 751                                  smb_fname_str_dbg(smb_fname)));
 752                         return NT_STATUS_ACCESS_DENIED;
 753                 }
 754                 if (flags & O_CREAT) {
 755                         /* We don't want to write - but we must make sure that
 756                            O_CREAT doesn't create the file if we have write
 757                            access into the directory.
 758                         */
 759                         flags &= ~(O_CREAT|O_EXCL);
 760                         local_flags &= ~(O_CREAT|O_EXCL);
 761                 }
 762         }
 763
 764         /*
 765          * This little piece of insanity is inspired by the
 766          * fact that an NT client can open a file for O_RDONLY,
 767          * but set the create disposition to FILE_EXISTS_TRUNCATE.
 768          * If the client *can* write to the file, then it expects to
 769          * truncate the file, even though it is opening for readonly.
 770          * Quicken uses this stupid trick in backup file creation...
 771          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
 772          * for helping track this one down. It didn't bite us in 2.0.x
 773          * as we always opened files read-write in that release. JRA.
 774          */
 775
 776         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
 777                 DEBUG(10,("open_file: truncate requested on read-only open "
 778                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
 779                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
 780         }
 781
 782         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
 783             (!file_existed && (local_flags & O_CREAT)) ||
 784             ((local_flags & O_TRUNC) == O_TRUNC) ) {
 785                 const char *wild;
 786                 int ret;
 787
 788 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
 789                 /*
 790                  * We would block on opening a FIFO with no one else on the
 791                  * other end. Do what we used to do and add O_NONBLOCK to the
 792                  * open flags. JRA.
 793                  */
 794
 795                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
 796                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
 797                         local_flags |= O_NONBLOCK;
 798                 }
 799 #endif
 800
 801                 /* Don't create files with Microsoft wildcard characters. */
 802                 if (fsp->base_fsp) {
 803                         /*
 804                          * wildcard characters are allowed in stream names
 805                          * only test the basefilename
 806                          */
 807                         wild = fsp->base_fsp->fsp_name->base_name;
 808                 } else {
 809                         wild = smb_fname->base_name;
 810                 }
 811                 if ((local_flags & O_CREAT) && !file_existed &&
 812                     ms_has_wild(wild))  {
 813                         return NT_STATUS_OBJECT_NAME_INVALID;
 814                 }
 815
 816                 /* Can we access this file ? */
 817                 if (!fsp->base_fsp) {
 818                         /* Only do this check on non-stream open. */
 819                         if (file_existed) {
 820                                 status = smbd_check_access_rights(conn,
 821                                                 smb_fname,
 822                                                 false,
 823                                                 access_mask);
 824
 825                                 if (!NT_STATUS_IS_OK(status)) {
 826                                         DEBUG(10, ("open_file: "
 827                                                    "smbd_check_access_rights "
 828                                                    "on file %s returned %s\n",
 829                                                    smb_fname_str_dbg(smb_fname),
 830                                                    nt_errstr(status)));
 831                                 }
 832
 833                                 if (!NT_STATUS_IS_OK(status) &&
 834                                     !NT_STATUS_EQUAL(status,
 835                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
 836                                 {
 837                                         return status;
 838                                 }
 839
 840                                 if (NT_STATUS_EQUAL(status,
 841                                         NT_STATUS_OBJECT_NAME_NOT_FOUND))
 842                                 {
 843                                         DEBUG(10, ("open_file: "
 844                                                 "file %s vanished since we "
 845                                                 "checked for existence.\n",
 846                                                 smb_fname_str_dbg(smb_fname)));
 847                                         file_existed = false;
 848                                         SET_STAT_INVALID(fsp->fsp_name->st);
 849                                 }
 850                         }
 851
 852                         if (!file_existed) {
 853                                 if (!(local_flags & O_CREAT)) {
 854                                         /* File didn't exist and no O_CREAT. */
 855                                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 856                                 }
 857
 858                                 status = check_parent_access(conn,
 859                                                              smb_fname,
 860                                                              SEC_DIR_ADD_FILE);
 861                                 if (!NT_STATUS_IS_OK(status)) {
 862                                         DEBUG(10, ("open_file: "
 863                                                    "check_parent_access on "
 864                                                    "file %s returned %s\n",
 865                                                    smb_fname_str_dbg(smb_fname),
 866                                                    nt_errstr(status) ));
 867                                         return status;
 868                                 }
 869                         }
 870                 }
 871
 872                 /*
 873                  * Actually do the open - if O_TRUNC is needed handle it
 874                  * below under the share mode lock.
 875                  */
 876                 status = fd_open_atomic(conn, fsp, local_flags & ~O_TRUNC,
 877                                 unx_mode, p_file_created);
 878                 if (!NT_STATUS_IS_OK(status)) {
 879                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
 880                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
 881                                  nt_errstr(status),local_flags,flags));
 882                         return status;
 883                 }
 884
 885                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 886                 if (ret == -1) {
 887                         /* If we have an fd, this stat should succeed. */
 888                         DEBUG(0,("Error doing fstat on open file %s "
 889                                 "(%s)\n",
 890                                 smb_fname_str_dbg(smb_fname),
 891                                 strerror(errno) ));
 892                         status = map_nt_error_from_unix(errno);
 893                         fd_close(fsp);
 894                         return status;
 895                 }
 896
 897                 if (*p_file_created) {
 898                         /* We created this file. */
 899
 900                         bool need_re_stat = false;
 901                         /* Do all inheritance work after we've
 902                            done a successful fstat call and filled
 903                            in the stat struct in fsp->fsp_name. */
 904
 905                         /* Inherit the ACL if required */
 906                         if (lp_inherit_permissions(SNUM(conn))) {
 907                                 inherit_access_posix_acl(conn, parent_dir,
 908                                                          smb_fname->base_name,
 909                                                          unx_mode);
 910                                 need_re_stat = true;
 911                         }
 912
 913                         /* Change the owner if required. */
 914                         if (lp_inherit_owner(SNUM(conn))) {
 915                                 change_file_owner_to_parent(conn, parent_dir,
 916                                                             fsp);
 917                                 need_re_stat = true;
 918                         }
 919
 920                         if (need_re_stat) {
 921                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 922                                 /* If we have an fd, this stat should succeed. */
 923                                 if (ret == -1) {
 924                                         DEBUG(0,("Error doing fstat on open file %s "
 925                                                  "(%s)\n",
 926                                                  smb_fname_str_dbg(smb_fname),
 927                                                  strerror(errno) ));
 928                                 }
 929                         }
 930
 931                         notify_fname(conn, NOTIFY_ACTION_ADDED,
 932                                      FILE_NOTIFY_CHANGE_FILE_NAME,
 933                                      smb_fname->base_name);
 934                 }
 935         } else {
 936                 fsp->fh->fd = -1; /* What we used to call a stat open. */
 937                 if (!file_existed) {
 938                         /* File must exist for a stat open. */
 939                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 940                 }
 941
 942                 status = smbd_check_access_rights(conn,
 943                                 smb_fname,
 944                                 false,
 945                                 access_mask);
 946
 947                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 948                                 fsp->posix_open &&
 949                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
 950                         /* This is a POSIX stat open for delete
 951                          * or rename on a symlink that points
 952                          * nowhere. Allow. */
 953                         DEBUG(10,("open_file: allowing POSIX "
 954                                   "open on bad symlink %s\n",
 955                                   smb_fname_str_dbg(smb_fname)));
 956                         status = NT_STATUS_OK;
 957                 }
 958
 959                 if (!NT_STATUS_IS_OK(status)) {
 960                         DEBUG(10,("open_file: "
 961                                 "smbd_check_access_rights on file "
 962                                 "%s returned %s\n",
 963                                 smb_fname_str_dbg(smb_fname),
 964                                 nt_errstr(status) ));
 965                         return status;
 966                 }
 967         }
 968
 969         /*
 970          * POSIX allows read-only opens of directories. We don't
 971          * want to do this (we use a different code path for this)
 972          * so catch a directory open and return an EISDIR. JRA.
 973          */
 974
 975         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
 976                 fd_close(fsp);
 977                 errno = EISDIR;
 978                 return NT_STATUS_FILE_IS_A_DIRECTORY;
 979         }
 980
 981         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 982         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
 983         fsp->file_pid = req ? req->smbpid : 0;
 984         fsp->can_lock = True;
 985         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
 986         fsp->can_write =
 987                 CAN_WRITE(conn) &&
 988                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
 989         fsp->print_file = NULL;
 990         fsp->modified = False;
 991         fsp->sent_oplock_break = NO_BREAK_SENT;
 992         fsp->is_directory = False;
 993         if (conn->aio_write_behind_list &&
 994             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
 995                        conn->case_sensitive)) {
 996                 fsp->aio_write_behind = True;
 997         }
 998
 999         fsp->wcp = NULL; /* Write cache pointer. */
1000
1001         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
1002                  conn->session_info->unix_info->unix_name,
1003                  smb_fname_str_dbg(smb_fname),
1004                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
1005                  conn->num_files_open));
1006
1007         errno = 0;
1008         return NT_STATUS_OK;
1009 }
1010
1011 /****************************************************************************
1012  Check if we can open a file with a share mode.
1013  Returns True if conflict, False if not.
1014 ****************************************************************************/
1015
1016 static bool share_conflict(struct share_mode_entry *entry,
1017                            uint32 access_mask,
1018                            uint32 share_access)
1019 {
1020         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
1021                   "entry->share_access = 0x%x, "
1022                   "entry->private_options = 0x%x\n",
1023                   (unsigned int)entry->access_mask,
1024                   (unsigned int)entry->share_access,
1025                   (unsigned int)entry->private_options));
1026
1027         if (server_id_is_disconnected(&entry->pid)) {
1028                 /*
1029                  * note: cleanup should have been done by
1030                  * delay_for_batch_oplocks()
1031                  */
1032                 return false;
1033         }
1034
1035         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1036                   (unsigned int)access_mask, (unsigned int)share_access));
1037
1038         if ((entry->access_mask & (FILE_WRITE_DATA|
1039                                    FILE_APPEND_DATA|
1040                                    FILE_READ_DATA|
1041                                    FILE_EXECUTE|
1042                                    DELETE_ACCESS)) == 0) {
1043                 DEBUG(10,("share_conflict: No conflict due to "
1044                           "entry->access_mask = 0x%x\n",
1045                           (unsigned int)entry->access_mask ));
1046                 return False;
1047         }
1048
1049         if ((access_mask & (FILE_WRITE_DATA|
1050                             FILE_APPEND_DATA|
1051                             FILE_READ_DATA|
1052                             FILE_EXECUTE|
1053                             DELETE_ACCESS)) == 0) {
1054                 DEBUG(10,("share_conflict: No conflict due to "
1055                           "access_mask = 0x%x\n",
1056                           (unsigned int)access_mask ));
1057                 return False;
1058         }
1059
1060 #if 1 /* JRA TEST - Superdebug. */
1061 #define CHECK_MASK(num, am, right, sa, share) \
1062         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1063                 (unsigned int)(num), (unsigned int)(am), \
1064                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1065         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1066                 (unsigned int)(num), (unsigned int)(sa), \
1067                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1068         if (((am) & (right)) && !((sa) & (share))) { \
1069                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1070 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1071                         (unsigned int)(share) )); \
1072                 return True; \
1073         }
1074 #else
1075 #define CHECK_MASK(num, am, right, sa, share) \
1076         if (((am) & (right)) && !((sa) & (share))) { \
1077                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1078 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1079                         (unsigned int)(share) )); \
1080                 return True; \
1081         }
1082 #endif
1083
1084         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1085                    share_access, FILE_SHARE_WRITE);
1086         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1087                    entry->share_access, FILE_SHARE_WRITE);
1088
1089         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1090                    share_access, FILE_SHARE_READ);
1091         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1092                    entry->share_access, FILE_SHARE_READ);
1093
1094         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1095                    share_access, FILE_SHARE_DELETE);
1096         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1097                    entry->share_access, FILE_SHARE_DELETE);
1098
1099         DEBUG(10,("share_conflict: No conflict.\n"));
1100         return False;
1101 }
1102
1103 #if defined(DEVELOPER)
1104 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1105                                       int num,
1106                                       struct share_mode_entry *share_entry)
1107 {
1108         struct server_id self = messaging_server_id(sconn->msg_ctx);
1109         files_struct *fsp;
1110
1111         if (!serverid_equal(&self, &share_entry->pid)) {
1112                 return;
1113         }
1114
1115         if (share_entry->op_mid == 0) {
1116                 /* INTERNAL_OPEN_ONLY */
1117                 return;
1118         }
1119
1120         if (!is_valid_share_mode_entry(share_entry)) {
1121                 return;
1122         }
1123
1124         fsp = file_find_dif(sconn, share_entry->id,
1125                             share_entry->share_file_id);
1126         if (!fsp) {
1127                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1128                          share_mode_str(talloc_tos(), num, share_entry) ));
1129                 smb_panic("validate_my_share_entries: Cannot match a "
1130                           "share entry with an open file\n");
1131         }
1132
1133         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1134                 goto panic;
1135         }
1136
1137         return;
1138
1139  panic:
1140         {
1141                 char *str;
1142                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1143                          share_mode_str(talloc_tos(), num, share_entry) ));
1144                 str = talloc_asprintf(talloc_tos(),
1145                         "validate_my_share_entries: "
1146                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1147                          fsp->fsp_name->base_name,
1148                          (unsigned int)fsp->oplock_type,
1149                          (unsigned int)share_entry->op_type );
1150                 smb_panic(str);
1151         }
1152 }
1153 #endif
1154
1155 bool is_stat_open(uint32 access_mask)
1156 {
1157         const uint32_t stat_open_bits =
1158                 (SYNCHRONIZE_ACCESS|
1159                  FILE_READ_ATTRIBUTES|
1160                  FILE_WRITE_ATTRIBUTES);
1161
1162         return (((access_mask &  stat_open_bits) != 0) &&
1163                 ((access_mask & ~stat_open_bits) == 0));
1164 }
1165
1166 static bool has_delete_on_close(struct share_mode_lock *lck,
1167                                 uint32_t name_hash)
1168 {
1169         struct share_mode_data *d = lck->data;
1170         uint32_t i;
1171
1172         if (d->num_share_modes == 0) {
1173                 return false;
1174         }
1175         if (!is_delete_on_close_set(lck, name_hash)) {
1176                 return false;
1177         }
1178         for (i=0; i<d->num_share_modes; i++) {
1179                 if (!share_mode_stale_pid(d, i)) {
1180                         return true;
1181                 }
1182         }
1183         return false;
1184 }
1185
1186 /****************************************************************************
1187  Deal with share modes
1188  Invariant: Share mode must be locked on entry and exit.
1189  Returns -1 on error, or number of share modes on success (may be zero).
1190 ****************************************************************************/
1191
1192 static NTSTATUS open_mode_check(connection_struct *conn,
1193                                 struct share_mode_lock *lck,
1194                                 uint32 access_mask,
1195                                 uint32 share_access)
1196 {
1197         int i;
1198
1199         if(lck->data->num_share_modes == 0) {
1200                 return NT_STATUS_OK;
1201         }
1202
1203         if (is_stat_open(access_mask)) {
1204                 /* Stat open that doesn't trigger oplock breaks or share mode
1205                  * checks... ! JRA. */
1206                 return NT_STATUS_OK;
1207         }
1208
1209         /*
1210          * Check if the share modes will give us access.
1211          */
1212
1213 #if defined(DEVELOPER)
1214         for(i = 0; i < lck->data->num_share_modes; i++) {
1215                 validate_my_share_entries(conn->sconn, i,
1216                                           &lck->data->share_modes[i]);
1217         }
1218 #endif
1219
1220         /* Now we check the share modes, after any oplock breaks. */
1221         for(i = 0; i < lck->data->num_share_modes; i++) {
1222
1223                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1224                         continue;
1225                 }
1226
1227                 /* someone else has a share lock on it, check to see if we can
1228                  * too */
1229                 if (share_conflict(&lck->data->share_modes[i],
1230                                    access_mask, share_access)) {
1231
1232                         if (share_mode_stale_pid(lck->data, i)) {
1233                                 continue;
1234                         }
1235
1236                         return NT_STATUS_SHARING_VIOLATION;
1237                 }
1238         }
1239
1240         return NT_STATUS_OK;
1241 }
1242
1243 /*
1244  * Send a break message to the oplock holder and delay the open for
1245  * our client.
1246  */
1247
1248 NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1249                                    const struct share_mode_entry *exclusive,
1250                                    uint16_t break_to)
1251 {
1252         NTSTATUS status;
1253         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1254         struct server_id_buf tmp;
1255
1256         DEBUG(10, ("Sending break request to PID %s\n",
1257                    server_id_str_buf(exclusive->pid, &tmp)));
1258
1259         /* Create the message. */
1260         share_mode_entry_to_message(msg, exclusive);
1261
1262         /* Overload entry->op_type */
1263         /*
1264          * This is a cut from uint32 to uint16, but so far only the lower 3
1265          * bits (LEASE_WRITE/HANDLE/READ are used anyway.
1266          */
1267         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1268
1269         status = messaging_send_buf(msg_ctx, exclusive->pid,
1270                                     MSG_SMB_BREAK_REQUEST,
1271                                     (uint8 *)msg, sizeof(msg));
1272         if (!NT_STATUS_IS_OK(status)) {
1273                 DEBUG(3, ("Could not send oplock break message: %s\n",
1274                           nt_errstr(status)));
1275         }
1276
1277         return status;
1278 }
1279
1280 /*
1281  * Do internal consistency checks on the share mode for a file.
1282  */
1283
1284 static bool validate_oplock_types(struct share_mode_lock *lck)
1285 {
1286         struct share_mode_data *d = lck->data;
1287         bool batch = false;
1288         bool ex_or_batch = false;
1289         bool level2 = false;
1290         bool no_oplock = false;
1291         uint32_t num_non_stat_opens = 0;
1292         uint32_t i;
1293
1294         for (i=0; i<d->num_share_modes; i++) {
1295                 struct share_mode_entry *e = &d->share_modes[i];
1296
1297                 if (!is_valid_share_mode_entry(e)) {
1298                         continue;
1299                 }
1300
1301                 if (e->op_mid == 0) {
1302                         /* INTERNAL_OPEN_ONLY */
1303                         continue;
1304                 }
1305
1306                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1307                         /* We ignore stat opens in the table - they
1308                            always have NO_OPLOCK and never get or
1309                            cause breaks. JRA. */
1310                         continue;
1311                 }
1312
1313                 num_non_stat_opens += 1;
1314
1315                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1316                         /* batch - can only be one. */
1317                         if (share_mode_stale_pid(d, i)) {
1318                                 DEBUG(10, ("Found stale batch oplock\n"));
1319                                 continue;
1320                         }
1321                         if (ex_or_batch || batch || level2 || no_oplock) {
1322                                 DEBUG(0, ("Bad batch oplock entry %u.",
1323                                           (unsigned)i));
1324                                 return false;
1325                         }
1326                         batch = true;
1327                 }
1328
1329                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1330                         if (share_mode_stale_pid(d, i)) {
1331                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1332                                 continue;
1333                         }
1334                         /* Exclusive or batch - can only be one. */
1335                         if (ex_or_batch || level2 || no_oplock) {
1336                                 DEBUG(0, ("Bad exclusive or batch oplock "
1337                                           "entry %u.", (unsigned)i));
1338                                 return false;
1339                         }
1340                         ex_or_batch = true;
1341                 }
1342
1343                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1344                         if (batch || ex_or_batch) {
1345                                 if (share_mode_stale_pid(d, i)) {
1346                                         DEBUG(10, ("Found stale LevelII "
1347                                                    "oplock\n"));
1348                                         continue;
1349                                 }
1350                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1351                                           (unsigned)i));
1352                                 return false;
1353                         }
1354                         level2 = true;
1355                 }
1356
1357                 if (e->op_type == NO_OPLOCK) {
1358                         if (batch || ex_or_batch) {
1359                                 if (share_mode_stale_pid(d, i)) {
1360                                         DEBUG(10, ("Found stale NO_OPLOCK "
1361                                                    "entry\n"));
1362                                         continue;
1363                                 }
1364                                 DEBUG(0, ("Bad no oplock entry %u.",
1365                                           (unsigned)i));
1366                                 return false;
1367                         }
1368                         no_oplock = true;
1369                 }
1370         }
1371
1372         remove_stale_share_mode_entries(d);
1373
1374         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1375                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1376                           (int)batch, (int)ex_or_batch,
1377                           (int)d->num_share_modes));
1378                 return false;
1379         }
1380
1381         return true;
1382 }
1383
1384 static bool delay_for_oplock(files_struct *fsp,
1385                              int oplock_request,
1386                              const struct smb2_lease *lease,
1387                              struct share_mode_lock *lck,
1388                              bool have_sharing_violation,
1389                              uint32_t create_disposition,
1390                              bool first_open_attempt)
1391 {
1392         struct share_mode_data *d = lck->data;
1393         uint32_t i;
1394         bool delay = false;
1395         bool will_overwrite;
1396
1397         if ((oplock_request & INTERNAL_OPEN_ONLY) ||
1398             is_stat_open(fsp->access_mask)) {
1399                 return false;
1400         }
1401
1402         switch (create_disposition) {
1403         case FILE_SUPERSEDE:
1404         case FILE_OVERWRITE:
1405         case FILE_OVERWRITE_IF:
1406                 will_overwrite = true;
1407                 break;
1408         default:
1409                 will_overwrite = false;
1410                 break;
1411         }
1412
1413         for (i=0; i<d->num_share_modes; i++) {
1414                 struct share_mode_entry *e = &d->share_modes[i];
1415                 struct share_mode_lease *l = NULL;
1416                 uint32_t e_lease_type = get_lease_type(d, e);
1417                 uint32_t break_to;
1418                 uint32_t delay_mask = 0;
1419
1420                 if (e->op_type == LEASE_OPLOCK) {
1421                         l = &d->leases[e->lease_idx];
1422                 }
1423
1424                 if (have_sharing_violation) {
1425                         delay_mask = SMB2_LEASE_HANDLE;
1426                 } else {
1427                         delay_mask = SMB2_LEASE_WRITE;
1428                 }
1429
1430                 break_to = e_lease_type & ~delay_mask;
1431
1432                 if (will_overwrite) {
1433                         /*
1434                          * we'll decide about SMB2_LEASE_READ later.
1435                          *
1436                          * Maybe the break will be defered
1437                          */
1438                         break_to &= ~SMB2_LEASE_HANDLE;
1439                 }
1440
1441                 DEBUG(10, ("entry %u: e_lease_type %u, will_overwrite: %u\n",
1442                            (unsigned)i, (unsigned)e_lease_type,
1443                            (unsigned)will_overwrite));
1444
1445                 if (lease != NULL && l != NULL) {
1446                         bool ign;
1447
1448                         ign = smb2_lease_equal(fsp_client_guid(fsp),
1449                                                &lease->lease_key,
1450                                                &l->client_guid,
1451                                                &l->lease_key);
1452                         if (ign) {
1453                                 continue;
1454                         }
1455                 }
1456
1457                 if ((e_lease_type & ~break_to) == 0) {
1458                         if (l != NULL && l->breaking) {
1459                                 delay = true;
1460                         }
1461                         continue;
1462                 }
1463
1464                 if (share_mode_stale_pid(d, i)) {
1465                         continue;
1466                 }
1467
1468                 if (will_overwrite) {
1469                         /*
1470                          * If we break anyway break to NONE directly.
1471                          * Otherwise vfs_set_filelen() will trigger the
1472                          * break.
1473                          */
1474                         break_to &= ~(SMB2_LEASE_READ|SMB2_LEASE_WRITE);
1475                 }
1476
1477                 if (e->op_type != LEASE_OPLOCK) {
1478                         /*
1479                          * Oplocks only support breaking to R or NONE.
1480                          */
1481                         break_to &= ~(SMB2_LEASE_HANDLE|SMB2_LEASE_WRITE);
1482                 }
1483
1484                 DEBUG(10, ("breaking from %d to %d\n",
1485                            (int)e_lease_type, (int)break_to));
1486                 send_break_message(fsp->conn->sconn->msg_ctx, e,
1487                                    break_to);
1488                 if (e_lease_type & delay_mask) {
1489                         delay = true;
1490                 }
1491                 if (l != NULL && l->breaking && !first_open_attempt) {
1492                         delay = true;
1493                 }
1494                 continue;
1495         }
1496
1497         return delay;
1498 }
1499
1500 static bool file_has_brlocks(files_struct *fsp)
1501 {
1502         struct byte_range_lock *br_lck;
1503
1504         br_lck = brl_get_locks_readonly(fsp);
1505         if (!br_lck)
1506                 return false;
1507
1508         return (brl_num_locks(br_lck) > 0);
1509 }
1510
1511 int find_share_mode_lease(struct share_mode_data *d,
1512                           const struct GUID *client_guid,
1513                           const struct smb2_lease_key *key)
1514 {
1515         uint32_t i;
1516
1517         for (i=0; i<d->num_leases; i++) {
1518                 struct share_mode_lease *l = &d->leases[i];
1519
1520                 if (smb2_lease_equal(client_guid,
1521                                      key,
1522                                      &l->client_guid,
1523                                      &l->lease_key)) {
1524                         return i;
1525                 }
1526         }
1527
1528         return -1;
1529 }
1530
1531 struct fsp_lease *find_fsp_lease(struct files_struct *new_fsp,
1532                                  const struct smb2_lease_key *key,
1533                                  const struct share_mode_lease *l)
1534 {
1535         struct files_struct *fsp;
1536
1537         /*
1538          * TODO: Measure how expensive this loop is with thousands of open
1539          * handles...
1540          */
1541
1542         for (fsp = file_find_di_first(new_fsp->conn->sconn, new_fsp->file_id);
1543              fsp != NULL;
1544              fsp = file_find_di_next(fsp)) {
1545
1546                 if (fsp == new_fsp) {
1547                         continue;
1548                 }
1549                 if (fsp->oplock_type != LEASE_OPLOCK) {
1550                         continue;
1551                 }
1552                 if (smb2_lease_key_equal(&fsp->lease->lease.lease_key, key)) {
1553                         fsp->lease->ref_count += 1;
1554                         return fsp->lease;
1555                 }
1556         }
1557
1558         /* Not found - must be leased in another smbd. */
1559         new_fsp->lease = talloc_zero(new_fsp->conn->sconn, struct fsp_lease);
1560         if (new_fsp->lease == NULL) {
1561                 return NULL;
1562         }
1563         new_fsp->lease->ref_count = 1;
1564         new_fsp->lease->sconn = new_fsp->conn->sconn;
1565         new_fsp->lease->lease.lease_key = *key;
1566         new_fsp->lease->lease.lease_state = l->current_state;
1567         /*
1568          * We internally treat all leases as V2 and update
1569          * the epoch, but when sending breaks it matters if
1570          * the requesting lease was v1 or v2.
1571          */
1572         new_fsp->lease->lease.lease_version = l->lease_version;
1573         new_fsp->lease->lease.lease_epoch = l->epoch;
1574         return new_fsp->lease;
1575 }
1576
1577 static NTSTATUS grant_fsp_lease(struct files_struct *fsp,
1578                                 struct share_mode_lock *lck,
1579                                 const struct smb2_lease *lease,
1580                                 uint32_t *p_lease_idx,
1581                                 uint32_t granted)
1582 {
1583         struct share_mode_data *d = lck->data;
1584         const struct GUID *client_guid = fsp_client_guid(fsp);
1585         struct share_mode_lease *tmp;
1586         NTSTATUS status;
1587         int idx;
1588
1589         idx = find_share_mode_lease(d, client_guid, &lease->lease_key);
1590
1591         if (idx != -1) {
1592                 struct share_mode_lease *l = &d->leases[idx];
1593                 bool do_upgrade;
1594                 uint32_t existing, requested;
1595
1596                 fsp->lease = find_fsp_lease(fsp, &lease->lease_key, l);
1597                 if (fsp->lease == NULL) {
1598                         DEBUG(1, ("Did not find existing lease for file %s\n",
1599                                   fsp_str_dbg(fsp)));
1600                         return NT_STATUS_NO_MEMORY;
1601                 }
1602
1603                 *p_lease_idx = idx;
1604
1605                 /*
1606                  * Upgrade only if the requested lease is a strict upgrade.
1607                  */
1608                 existing = l->current_state;
1609                 requested = lease->lease_state;
1610
1611                 /*
1612                  * Tricky: This test makes sure that "requested" is a
1613                  * strict bitwise superset of "existing".
1614                  */
1615                 do_upgrade = ((existing & requested) == existing);
1616
1617                 /*
1618                  * Upgrade only if there's a change.
1619                  */
1620                 do_upgrade &= (granted != existing);
1621
1622                 /*
1623                  * Upgrade only if other leases don't prevent what was asked
1624                  * for.
1625                  */
1626                 do_upgrade &= (granted == requested);
1627
1628                 /*
1629                  * only upgrade if we are not in breaking state
1630                  */
1631                 do_upgrade &= !l->breaking;
1632
1633                 DEBUG(10, ("existing=%"PRIu32", requested=%"PRIu32", "
1634                            "granted=%"PRIu32", do_upgrade=%d\n",
1635                            existing, requested, granted, (int)do_upgrade));
1636
1637                 if (do_upgrade) {
1638                         l->current_state = granted;
1639                         l->epoch += 1;
1640                 }
1641
1642                 /* Ensure we're in sync with current lease state. */
1643                 fsp_lease_update(lck, fsp_client_guid(fsp), fsp->lease);
1644                 return NT_STATUS_OK;
1645         }
1646
1647         /*
1648          * Create new lease
1649          */
1650
1651         tmp = talloc_realloc(d, d->leases, struct share_mode_lease,
1652                              d->num_leases+1);
1653         if (tmp == NULL) {
1654                 /*
1655                  * See [MS-SMB2]
1656                  */
1657                 return NT_STATUS_INSUFFICIENT_RESOURCES;
1658         }
1659         d->leases = tmp;
1660
1661         fsp->lease = talloc_zero(fsp->conn->sconn, struct fsp_lease);
1662         if (fsp->lease == NULL) {
1663                 return NT_STATUS_INSUFFICIENT_RESOURCES;
1664         }
1665         fsp->lease->ref_count = 1;
1666         fsp->lease->sconn = fsp->conn->sconn;
1667         fsp->lease->lease.lease_version = lease->lease_version;
1668         fsp->lease->lease.lease_key = lease->lease_key;
1669         fsp->lease->lease.lease_state = granted;
1670         fsp->lease->lease.lease_epoch = lease->lease_epoch + 1;
1671
1672         *p_lease_idx = d->num_leases;
1673
1674         d->leases[d->num_leases] = (struct share_mode_lease) {
1675                 .client_guid = *client_guid,
1676                 .lease_key = fsp->lease->lease.lease_key,
1677                 .current_state = fsp->lease->lease.lease_state,
1678                 .lease_version = fsp->lease->lease.lease_version,
1679                 .epoch = fsp->lease->lease.lease_epoch,
1680         };
1681
1682         status = leases_db_add(client_guid,
1683                                &lease->lease_key,
1684                                &fsp->file_id,
1685                                fsp->conn->connectpath,
1686                                fsp->fsp_name->base_name,
1687                                fsp->fsp_name->stream_name);
1688         if (!NT_STATUS_IS_OK(status)) {
1689                 DEBUG(10, ("%s: leases_db_add failed: %s\n", __func__,
1690                            nt_errstr(status)));
1691                 TALLOC_FREE(fsp->lease);
1692                 return NT_STATUS_INSUFFICIENT_RESOURCES;
1693         }
1694
1695         d->num_leases += 1;
1696         d->modified = true;
1697
1698         return NT_STATUS_OK;
1699 }
1700
1701 static bool is_same_lease(const files_struct *fsp,
1702                           const struct share_mode_data *d,
1703                           const struct share_mode_entry *e,
1704                           const struct smb2_lease *lease)
1705 {
1706         if (e->op_type != LEASE_OPLOCK) {
1707                 return false;
1708         }
1709         if (lease == NULL) {
1710                 return false;
1711         }
1712
1713         return smb2_lease_equal(fsp_client_guid(fsp),
1714                                 &lease->lease_key,
1715                                 &d->leases[e->lease_idx].client_guid,
1716                                 &d->leases[e->lease_idx].lease_key);
1717 }
1718
1719 static NTSTATUS grant_fsp_oplock_type(struct smb_request *req,
1720                                       struct files_struct *fsp,
1721                                       struct share_mode_lock *lck,
1722                                       int oplock_request,
1723                                       struct smb2_lease *lease)
1724 {
1725         struct share_mode_data *d = lck->data;
1726         bool got_handle_lease = false;
1727         bool got_oplock = false;
1728         uint32_t i;
1729         uint32_t granted;
1730         uint32_t lease_idx = UINT32_MAX;
1731         bool ok;
1732         NTSTATUS status;
1733
1734         if (oplock_request & INTERNAL_OPEN_ONLY) {
1735                 /* No oplocks on internal open. */
1736                 oplock_request = NO_OPLOCK;
1737                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1738                         fsp->oplock_type, fsp_str_dbg(fsp)));
1739         }
1740
1741         if (oplock_request == LEASE_OPLOCK) {
1742                 if (lease == NULL) {
1743                         /*
1744                          * The SMB2 layer should have checked this
1745                          */
1746                         return NT_STATUS_INTERNAL_ERROR;
1747                 }
1748
1749                 granted = lease->lease_state;
1750
1751                 if (lp_kernel_oplocks(SNUM(fsp->conn))) {
1752                         DEBUG(10, ("No lease granted because kernel oplocks are enabled\n"));
1753                         granted = SMB2_LEASE_NONE;
1754                 }
1755                 if ((granted & (SMB2_LEASE_READ|SMB2_LEASE_WRITE)) == 0) {
1756                         DEBUG(10, ("No read or write lease requested\n"));
1757                         granted = SMB2_LEASE_NONE;
1758                 }
1759                 if (granted == SMB2_LEASE_WRITE) {
1760                         DEBUG(10, ("pure write lease requested\n"));
1761                         granted = SMB2_LEASE_NONE;
1762                 }
1763                 if (granted == (SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE)) {
1764                         DEBUG(10, ("write and handle lease requested\n"));
1765                         granted = SMB2_LEASE_NONE;
1766                 }
1767         } else {
1768                 granted = map_oplock_to_lease_type(
1769                         oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1770         }
1771
1772         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1773                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1774                         fsp_str_dbg(fsp)));
1775                 granted &= ~SMB2_LEASE_READ;
1776         }
1777
1778         for (i=0; i<d->num_share_modes; i++) {
1779                 struct share_mode_entry *e = &d->share_modes[i];
1780                 uint32_t e_lease_type;
1781
1782                 e_lease_type = get_lease_type(d, e);
1783
1784                 if ((granted & SMB2_LEASE_WRITE) &&
1785                     !is_same_lease(fsp, d, e, lease) &&
1786                     !share_mode_stale_pid(d, i)) {
1787                         /*
1788                          * Can grant only one writer
1789                          */
1790                         granted &= ~SMB2_LEASE_WRITE;
1791                 }
1792
1793                 if ((e_lease_type & SMB2_LEASE_HANDLE) && !got_handle_lease &&
1794                     !share_mode_stale_pid(d, i)) {
1795                         got_handle_lease = true;
1796                 }
1797
1798                 if ((e->op_type != LEASE_OPLOCK) && !got_oplock &&
1799                     !share_mode_stale_pid(d, i)) {
1800                         got_oplock = true;
1801                 }
1802         }
1803
1804         if ((granted & SMB2_LEASE_READ) && !(granted & SMB2_LEASE_WRITE)) {
1805                 bool allow_level2 =
1806                         (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1807                         lp_level2_oplocks(SNUM(fsp->conn));
1808
1809                 if (!allow_level2) {
1810                         granted = SMB2_LEASE_NONE;
1811                 }
1812         }
1813
1814         if (oplock_request == LEASE_OPLOCK) {
1815                 if (got_oplock) {
1816                         granted &= ~SMB2_LEASE_HANDLE;
1817                 }
1818
1819                 fsp->oplock_type = LEASE_OPLOCK;
1820
1821                 status = grant_fsp_lease(fsp, lck, lease, &lease_idx,
1822                                          granted);
1823                 if (!NT_STATUS_IS_OK(status)) {
1824                         return status;
1825
1826                 }
1827                 *lease = fsp->lease->lease;
1828                 DEBUG(10, ("lease_state=%d\n", lease->lease_state));
1829         } else {
1830                 if (got_handle_lease) {
1831                         granted = SMB2_LEASE_NONE;
1832                 }
1833
1834                 switch (granted) {
1835                 case SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE:
1836                         fsp->oplock_type = BATCH_OPLOCK|EXCLUSIVE_OPLOCK;
1837                         break;
1838                 case SMB2_LEASE_READ|SMB2_LEASE_WRITE:
1839                         fsp->oplock_type = EXCLUSIVE_OPLOCK;
1840                         break;
1841                 case SMB2_LEASE_READ|SMB2_LEASE_HANDLE:
1842                 case SMB2_LEASE_READ:
1843                         fsp->oplock_type = LEVEL_II_OPLOCK;
1844                         break;
1845                 default:
1846                         fsp->oplock_type = NO_OPLOCK;
1847                         break;
1848                 }
1849
1850                 status = set_file_oplock(fsp);
1851                 if (!NT_STATUS_IS_OK(status)) {
1852                         /*
1853                          * Could not get the kernel oplock
1854                          */
1855                         fsp->oplock_type = NO_OPLOCK;
1856                 }
1857         }
1858
1859         ok = set_share_mode(lck, fsp, get_current_uid(fsp->conn),
1860                             req ? req->mid : 0,
1861                             fsp->oplock_type,
1862                             lease_idx);
1863         if (!ok) {
1864                 return NT_STATUS_NO_MEMORY;
1865         }
1866
1867         ok = update_num_read_oplocks(fsp, lck);
1868         if (!ok) {
1869                 del_share_mode(lck, fsp);
1870                 return NT_STATUS_INTERNAL_ERROR;
1871         }
1872
1873         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1874                   fsp->oplock_type, fsp_str_dbg(fsp)));
1875
1876         return NT_STATUS_OK;
1877 }
1878
1879 static bool request_timed_out(struct timeval request_time,
1880                               struct timeval timeout)
1881 {
1882         struct timeval now, end_time;
1883         GetTimeOfDay(&now);
1884         end_time = timeval_sum(&request_time, &timeout);
1885         return (timeval_compare(&end_time, &now) < 0);
1886 }
1887
1888 struct defer_open_state {
1889         struct smbXsrv_connection *xconn;
1890         uint64_t mid;
1891 };
1892
1893 static void defer_open_done(struct tevent_req *req);
1894
1895 /****************************************************************************
1896  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1897 ****************************************************************************/
1898
1899 static void defer_open(struct share_mode_lock *lck,
1900                        struct timeval request_time,
1901                        struct timeval timeout,
1902                        struct smb_request *req,
1903                        struct deferred_open_record *state)
1904 {
1905         struct deferred_open_record *open_rec;
1906
1907         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1908                   "open entry for mid %llu\n",
1909                   (unsigned int)request_time.tv_sec,
1910                   (unsigned int)request_time.tv_usec,
1911                   (unsigned long long)req->mid));
1912
1913         open_rec = talloc(NULL, struct deferred_open_record);
1914         if (open_rec == NULL) {
1915                 TALLOC_FREE(lck);
1916                 exit_server("talloc failed");
1917         }
1918
1919         *open_rec = *state;
1920
1921         if (lck) {
1922                 struct defer_open_state *watch_state;
1923                 struct tevent_req *watch_req;
1924                 bool ret;
1925
1926                 watch_state = talloc(open_rec, struct defer_open_state);
1927                 if (watch_state == NULL) {
1928                         exit_server("talloc failed");
1929                 }
1930                 watch_state->xconn = req->xconn;
1931                 watch_state->mid = req->mid;
1932
1933                 DEBUG(10, ("defering mid %llu\n",
1934                            (unsigned long long)req->mid));
1935
1936                 watch_req = dbwrap_record_watch_send(
1937                         watch_state, req->sconn->ev_ctx, lck->data->record,
1938                         req->sconn->msg_ctx);
1939                 if (watch_req == NULL) {
1940                         exit_server("Could not watch share mode record");
1941                 }
1942                 tevent_req_set_callback(watch_req, defer_open_done,
1943                                         watch_state);
1944
1945                 ret = tevent_req_set_endtime(
1946                         watch_req, req->sconn->ev_ctx,
1947                         timeval_sum(&request_time, &timeout));
1948                 SMB_ASSERT(ret);
1949         }
1950
1951         if (!push_deferred_open_message_smb(req, request_time, timeout,
1952                                             state->id, open_rec)) {
1953                 TALLOC_FREE(lck);
1954                 exit_server("push_deferred_open_message_smb failed");
1955         }
1956 }
1957
1958 static void defer_open_done(struct tevent_req *req)
1959 {
1960         struct defer_open_state *state = tevent_req_callback_data(
1961                 req, struct defer_open_state);
1962         NTSTATUS status;
1963         bool ret;
1964
1965         status = dbwrap_record_watch_recv(req, talloc_tos(), NULL);
1966         TALLOC_FREE(req);
1967         if (!NT_STATUS_IS_OK(status)) {
1968                 DEBUG(5, ("dbwrap_record_watch_recv returned %s\n",
1969                           nt_errstr(status)));
1970                 /*
1971                  * Even if it failed, retry anyway. TODO: We need a way to
1972                  * tell a re-scheduled open about that error.
1973                  */
1974         }
1975
1976         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
1977
1978         ret = schedule_deferred_open_message_smb(state->xconn, state->mid);
1979         SMB_ASSERT(ret);
1980         TALLOC_FREE(state);
1981 }
1982
1983
1984 /****************************************************************************
1985  On overwrite open ensure that the attributes match.
1986 ****************************************************************************/
1987
1988 static bool open_match_attributes(connection_struct *conn,
1989                                   uint32 old_dos_attr,
1990                                   uint32 new_dos_attr,
1991                                   mode_t existing_unx_mode,
1992                                   mode_t new_unx_mode,
1993                                   mode_t *returned_unx_mode)
1994 {
1995         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1996
1997         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1998         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1999
2000         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
2001            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
2002                 *returned_unx_mode = new_unx_mode;
2003         } else {
2004                 *returned_unx_mode = (mode_t)0;
2005         }
2006
2007         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
2008                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
2009                   "returned_unx_mode = 0%o\n",
2010                   (unsigned int)old_dos_attr,
2011                   (unsigned int)existing_unx_mode,
2012                   (unsigned int)new_dos_attr,
2013                   (unsigned int)*returned_unx_mode ));
2014
2015         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
2016         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2017                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
2018                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
2019                         return False;
2020                 }
2021         }
2022         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
2023                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
2024                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
2025                         return False;
2026                 }
2027         }
2028         return True;
2029 }
2030
2031 /****************************************************************************
2032  Special FCB or DOS processing in the case of a sharing violation.
2033  Try and find a duplicated file handle.
2034 ****************************************************************************/
2035
2036 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
2037                                 connection_struct *conn,
2038                                 files_struct *fsp_to_dup_into,
2039                                 const struct smb_filename *smb_fname,
2040                                 struct file_id id,
2041                                 uint16 file_pid,
2042                                 uint64_t vuid,
2043                                 uint32 access_mask,
2044                                 uint32 share_access,
2045                                 uint32 create_options)
2046 {
2047         files_struct *fsp;
2048
2049         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
2050                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
2051
2052         for(fsp = file_find_di_first(conn->sconn, id); fsp;
2053             fsp = file_find_di_next(fsp)) {
2054
2055                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
2056                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
2057                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
2058                           fsp->fh->fd, (unsigned long long)fsp->vuid,
2059                           (unsigned int)fsp->file_pid,
2060                           (unsigned int)fsp->fh->private_options,
2061                           (unsigned int)fsp->access_mask ));
2062
2063                 if (fsp != fsp_to_dup_into &&
2064                     fsp->fh->fd != -1 &&
2065                     fsp->vuid == vuid &&
2066                     fsp->file_pid == file_pid &&
2067                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
2068                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
2069                     (fsp->access_mask & FILE_WRITE_DATA) &&
2070                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
2071                     strequal(fsp->fsp_name->stream_name,
2072                              smb_fname->stream_name)) {
2073                         DEBUG(10,("fcb_or_dos_open: file match\n"));
2074                         break;
2075                 }
2076         }
2077
2078         if (!fsp) {
2079                 return NT_STATUS_NOT_FOUND;
2080         }
2081
2082         /* quite an insane set of semantics ... */
2083         if (is_executable(smb_fname->base_name) &&
2084             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
2085                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
2086                 return NT_STATUS_INVALID_PARAMETER;
2087         }
2088
2089         /* We need to duplicate this fsp. */
2090         return dup_file_fsp(req, fsp, access_mask, share_access,
2091                             create_options, fsp_to_dup_into);
2092 }
2093
2094 static void schedule_defer_open(struct share_mode_lock *lck,
2095                                 struct file_id id,
2096                                 struct timeval request_time,
2097                                 struct smb_request *req)
2098 {
2099         struct deferred_open_record state;
2100
2101         /* This is a relative time, added to the absolute
2102            request_time value to get the absolute timeout time.
2103            Note that if this is the second or greater time we enter
2104            this codepath for this particular request mid then
2105            request_time is left as the absolute time of the *first*
2106            time this request mid was processed. This is what allows
2107            the request to eventually time out. */
2108
2109         struct timeval timeout;
2110
2111         /* Normally the smbd we asked should respond within
2112          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
2113          * the client did, give twice the timeout as a safety
2114          * measure here in case the other smbd is stuck
2115          * somewhere else. */
2116
2117         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
2118
2119         /* Nothing actually uses state.delayed_for_oplocks
2120            but it's handy to differentiate in debug messages
2121            between a 30 second delay due to oplock break, and
2122            a 1 second delay for share mode conflicts. */
2123
2124         state.delayed_for_oplocks = True;
2125         state.async_open = false;
2126         state.id = id;
2127
2128         if (!request_timed_out(request_time, timeout)) {
2129                 defer_open(lck, request_time, timeout, req, &state);
2130         }
2131 }
2132
2133 /****************************************************************************
2134  Reschedule an open call that went asynchronous.
2135 ****************************************************************************/
2136
2137 static void schedule_async_open(struct timeval request_time,
2138                                 struct smb_request *req)
2139 {
2140         struct deferred_open_record state;
2141         struct timeval timeout;
2142
2143         timeout = timeval_set(20, 0);
2144
2145         ZERO_STRUCT(state);
2146         state.delayed_for_oplocks = false;
2147         state.async_open = true;
2148
2149         if (!request_timed_out(request_time, timeout)) {
2150                 defer_open(NULL, request_time, timeout, req, &state);
2151         }
2152 }
2153
2154 /****************************************************************************
2155  Work out what access_mask to use from what the client sent us.
2156 ****************************************************************************/
2157
2158 static NTSTATUS smbd_calculate_maximum_allowed_access(
2159         connection_struct *conn,
2160         const struct smb_filename *smb_fname,
2161         bool use_privs,
2162         uint32_t *p_access_mask)
2163 {
2164         struct security_descriptor *sd;
2165         uint32_t access_granted;
2166         NTSTATUS status;
2167
2168         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
2169                 *p_access_mask |= FILE_GENERIC_ALL;
2170                 return NT_STATUS_OK;
2171         }
2172
2173         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
2174                                     (SECINFO_OWNER |
2175                                      SECINFO_GROUP |
2176                                      SECINFO_DACL),
2177                                     talloc_tos(), &sd);
2178
2179         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
2180                 /*
2181                  * File did not exist
2182                  */
2183                 *p_access_mask = FILE_GENERIC_ALL;
2184                 return NT_STATUS_OK;
2185         }
2186         if (!NT_STATUS_IS_OK(status)) {
2187                 DEBUG(10,("Could not get acl on file %s: %s\n",
2188                           smb_fname_str_dbg(smb_fname),
2189                           nt_errstr(status)));
2190                 return NT_STATUS_ACCESS_DENIED;
2191         }
2192
2193         /*
2194          * If we can access the path to this file, by
2195          * default we have FILE_READ_ATTRIBUTES from the
2196          * containing directory. See the section:
2197          * "Algorithm to Check Access to an Existing File"
2198          * in MS-FSA.pdf.
2199          *
2200          * se_file_access_check()
2201          * also takes care of owner WRITE_DAC and READ_CONTROL.
2202          */
2203         status = se_file_access_check(sd,
2204                                  get_current_nttok(conn),
2205                                  use_privs,
2206                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
2207                                  &access_granted);
2208
2209         TALLOC_FREE(sd);
2210
2211         if (!NT_STATUS_IS_OK(status)) {
2212                 DEBUG(10, ("Access denied on file %s: "
2213                            "when calculating maximum access\n",
2214                            smb_fname_str_dbg(smb_fname)));
2215                 return NT_STATUS_ACCESS_DENIED;
2216         }
2217         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
2218
2219         if (!(access_granted & DELETE_ACCESS)) {
2220                 if (can_delete_file_in_directory(conn, smb_fname)) {
2221                         *p_access_mask |= DELETE_ACCESS;
2222                 }
2223         }
2224
2225         return NT_STATUS_OK;
2226 }
2227
2228 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
2229                                     const struct smb_filename *smb_fname,
2230                                     bool use_privs,
2231                                     uint32_t access_mask,
2232                                     uint32_t *access_mask_out)
2233 {
2234         NTSTATUS status;
2235         uint32_t orig_access_mask = access_mask;
2236         uint32_t rejected_share_access;
2237
2238         /*
2239          * Convert GENERIC bits to specific bits.
2240          */
2241
2242         se_map_generic(&access_mask, &file_generic_mapping);
2243
2244         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
2245         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
2246
2247                 status = smbd_calculate_maximum_allowed_access(
2248                         conn, smb_fname, use_privs, &access_mask);
2249
2250                 if (!NT_STATUS_IS_OK(status)) {
2251                         return status;
2252                 }
2253
2254                 access_mask &= conn->share_access;
2255         }
2256
2257         rejected_share_access = access_mask & ~(conn->share_access);
2258
2259         if (rejected_share_access) {
2260                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
2261                         "file %s: rejected by share access mask[0x%08X] "
2262                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
2263                         smb_fname_str_dbg(smb_fname),
2264                         conn->share_access,
2265                         orig_access_mask, access_mask,
2266                         rejected_share_access));
2267                 return NT_STATUS_ACCESS_DENIED;
2268         }
2269
2270         *access_mask_out = access_mask;
2271         return NT_STATUS_OK;
2272 }
2273
2274 /****************************************************************************
2275  Remove the deferred open entry under lock.
2276 ****************************************************************************/
2277
2278 /****************************************************************************
2279  Return true if this is a state pointer to an asynchronous create.
2280 ****************************************************************************/
2281
2282 bool is_deferred_open_async(const struct deferred_open_record *rec)
2283 {
2284         return rec->async_open;
2285 }
2286
2287 static bool clear_ads(uint32_t create_disposition)
2288 {
2289         bool ret = false;
2290
2291         switch (create_disposition) {
2292         case FILE_SUPERSEDE:
2293         case FILE_OVERWRITE_IF:
2294         case FILE_OVERWRITE:
2295                 ret = true;
2296                 break;
2297         default:
2298                 break;
2299         }
2300         return ret;
2301 }
2302
2303 static int disposition_to_open_flags(uint32_t create_disposition)
2304 {
2305         int ret = 0;
2306
2307         /*
2308          * Currently we're using FILE_SUPERSEDE as the same as
2309          * FILE_OVERWRITE_IF but they really are
2310          * different. FILE_SUPERSEDE deletes an existing file
2311          * (requiring delete access) then recreates it.
2312          */
2313
2314         switch (create_disposition) {
2315         case FILE_SUPERSEDE:
2316         case FILE_OVERWRITE_IF:
2317                 /*
2318                  * If file exists replace/overwrite. If file doesn't
2319                  * exist create.
2320                  */
2321                 ret = O_CREAT|O_TRUNC;
2322                 break;
2323
2324         case FILE_OPEN:
2325                 /*
2326                  * If file exists open. If file doesn't exist error.
2327                  */
2328                 ret = 0;
2329                 break;
2330
2331         case FILE_OVERWRITE:
2332                 /*
2333                  * If file exists overwrite. If file doesn't exist
2334                  * error.
2335                  */
2336                 ret = O_TRUNC;
2337                 break;
2338
2339         case FILE_CREATE:
2340                 /*
2341                  * If file exists error. If file doesn't exist create.
2342                  */
2343                 ret = O_CREAT|O_EXCL;
2344                 break;
2345
2346         case FILE_OPEN_IF:
2347                 /*
2348                  * If file exists open. If file doesn't exist create.
2349                  */
2350                 ret = O_CREAT;
2351                 break;
2352         }
2353         return ret;
2354 }
2355
2356 static int calculate_open_access_flags(uint32_t access_mask,
2357                                        int oplock_request,
2358                                        uint32_t private_flags)
2359 {
2360         bool need_write, need_read;
2361
2362         /*
2363          * Note that we ignore the append flag as append does not
2364          * mean the same thing under DOS and Unix.
2365          */
2366
2367         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2368         if (!need_write) {
2369                 return O_RDONLY;
2370         }
2371
2372         /* DENY_DOS opens are always underlying read-write on the
2373            file handle, no matter what the requested access mask
2374            says. */
2375
2376         need_read =
2377                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2378                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2379                                 FILE_READ_EA|FILE_EXECUTE));
2380
2381         if (!need_read) {
2382                 return O_WRONLY;
2383         }
2384         return O_RDWR;
2385 }
2386
2387 /****************************************************************************
2388  Open a file with a share mode. Passed in an already created files_struct *.
2389 ****************************************************************************/
2390
2391 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2392                             struct smb_request *req,
2393                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
2394                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
2395                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
2396                             uint32 create_options,      /* options such as delete on close. */
2397                             uint32 new_dos_attributes,  /* attributes used for new file. */
2398                             int oplock_request,         /* internal Samba oplock codes. */
2399                             struct smb2_lease *lease,
2400                                                         /* Information (FILE_EXISTS etc.) */
2401                             uint32_t private_flags,     /* Samba specific flags. */
2402                             int *pinfo,
2403                             files_struct *fsp)
2404 {
2405         struct smb_filename *smb_fname = fsp->fsp_name;
2406         int flags=0;
2407         int flags2=0;
2408         bool file_existed = VALID_STAT(smb_fname->st);
2409         bool def_acl = False;
2410         bool posix_open = False;
2411         bool new_file_created = False;
2412         bool first_open_attempt = true;
2413         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
2414         mode_t new_unx_mode = (mode_t)0;
2415         mode_t unx_mode = (mode_t)0;
2416         int info;
2417         uint32 existing_dos_attributes = 0;
2418         struct timeval request_time = timeval_zero();
2419         struct share_mode_lock *lck = NULL;
2420         uint32 open_access_mask = access_mask;
2421         NTSTATUS status;
2422         char *parent_dir;
2423         SMB_STRUCT_STAT saved_stat = smb_fname->st;
2424         struct timespec old_write_time;
2425         struct file_id id;
2426
2427         if (conn->printer) {
2428                 /*
2429                  * Printers are handled completely differently.
2430                  * Most of the passed parameters are ignored.
2431                  */
2432
2433                 if (pinfo) {
2434                         *pinfo = FILE_WAS_CREATED;
2435                 }
2436
2437                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
2438                            smb_fname_str_dbg(smb_fname)));
2439
2440                 if (!req) {
2441                         DEBUG(0,("open_file_ntcreate: printer open without "
2442                                 "an SMB request!\n"));
2443                         return NT_STATUS_INTERNAL_ERROR;
2444                 }
2445
2446                 return print_spool_open(fsp, smb_fname->base_name,
2447                                         req->vuid);
2448         }
2449
2450         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
2451                             NULL)) {
2452                 return NT_STATUS_NO_MEMORY;
2453         }
2454
2455         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2456                 posix_open = True;
2457                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2458                 new_dos_attributes = 0;
2459         } else {
2460                 /* Windows allows a new file to be created and
2461                    silently removes a FILE_ATTRIBUTE_DIRECTORY
2462                    sent by the client. Do the same. */
2463
2464                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
2465
2466                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
2467                  * created new. */
2468                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2469                                      smb_fname, parent_dir);
2470         }
2471
2472         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
2473                    "access_mask=0x%x share_access=0x%x "
2474                    "create_disposition = 0x%x create_options=0x%x "
2475                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
2476                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
2477                    access_mask, share_access, create_disposition,
2478                    create_options, (unsigned int)unx_mode, oplock_request,
2479                    (unsigned int)private_flags));
2480
2481         if (req == NULL) {
2482                 /* Ensure req == NULL means INTERNAL_OPEN_ONLY */
2483                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) != 0));
2484         } else {
2485                 /* And req != NULL means no INTERNAL_OPEN_ONLY */
2486                 SMB_ASSERT(((oplock_request & INTERNAL_OPEN_ONLY) == 0));
2487         }
2488
2489         /*
2490          * Only non-internal opens can be deferred at all
2491          */
2492
2493         if (req) {
2494                 struct deferred_open_record *open_rec;
2495                 if (get_deferred_open_message_state(req,
2496                                 &request_time,
2497                                 &open_rec)) {
2498                         /* Remember the absolute time of the original
2499                            request with this mid. We'll use it later to
2500                            see if this has timed out. */
2501
2502                         /* If it was an async create retry, the file
2503                            didn't exist. */
2504
2505                         if (is_deferred_open_async(open_rec)) {
2506                                 SET_STAT_INVALID(smb_fname->st);
2507                                 file_existed = false;
2508                         }
2509
2510                         /* Ensure we don't reprocess this message. */
2511                         remove_deferred_open_message_smb(req->xconn, req->mid);
2512
2513                         first_open_attempt = false;
2514                 }
2515         }
2516
2517         if (!posix_open) {
2518                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
2519                 if (file_existed) {
2520                         existing_dos_attributes = dos_mode(conn, smb_fname);
2521                 }
2522         }
2523
2524         /* ignore any oplock requests if oplocks are disabled */
2525         if (!lp_oplocks(SNUM(conn)) ||
2526             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
2527                 /* Mask off everything except the private Samba bits. */
2528                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2529         }
2530
2531         /* this is for OS/2 long file names - say we don't support them */
2532         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2533                 /* OS/2 Workplace shell fix may be main code stream in a later
2534                  * release. */
2535                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2536                          "supported.\n"));
2537                 if (use_nt_status()) {
2538                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2539                 }
2540                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2541         }
2542
2543         switch( create_disposition ) {
2544                 case FILE_OPEN:
2545                         /* If file exists open. If file doesn't exist error. */
2546                         if (!file_existed) {
2547                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2548                                          "requested for file %s and file "
2549                                          "doesn't exist.\n",
2550                                          smb_fname_str_dbg(smb_fname)));
2551                                 errno = ENOENT;
2552                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2553                         }
2554                         break;
2555
2556                 case FILE_OVERWRITE:
2557                         /* If file exists overwrite. If file doesn't exist
2558                          * error. */
2559                         if (!file_existed) {
2560                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2561                                          "requested for file %s and file "
2562                                          "doesn't exist.\n",
2563                                          smb_fname_str_dbg(smb_fname) ));
2564                                 errno = ENOENT;
2565                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2566                         }
2567                         break;
2568
2569                 case FILE_CREATE:
2570                         /* If file exists error. If file doesn't exist
2571                          * create. */
2572                         if (file_existed) {
2573                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2574                                          "requested for file %s and file "
2575                                          "already exists.\n",
2576                                          smb_fname_str_dbg(smb_fname)));
2577                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2578                                         errno = EISDIR;
2579                                 } else {
2580                                         errno = EEXIST;
2581                                 }
2582                                 return map_nt_error_from_unix(errno);
2583                         }
2584                         break;
2585
2586                 case FILE_SUPERSEDE:
2587                 case FILE_OVERWRITE_IF:
2588                 case FILE_OPEN_IF:
2589                         break;
2590                 default:
2591                         return NT_STATUS_INVALID_PARAMETER;
2592         }
2593
2594         flags2 = disposition_to_open_flags(create_disposition);
2595
2596         /* We only care about matching attributes on file exists and
2597          * overwrite. */
2598
2599         if (!posix_open && file_existed &&
2600             ((create_disposition == FILE_OVERWRITE) ||
2601              (create_disposition == FILE_OVERWRITE_IF))) {
2602                 if (!open_match_attributes(conn, existing_dos_attributes,
2603                                            new_dos_attributes,
2604                                            smb_fname->st.st_ex_mode,
2605                                            unx_mode, &new_unx_mode)) {
2606                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2607                                  "for file %s (%x %x) (0%o, 0%o)\n",
2608                                  smb_fname_str_dbg(smb_fname),
2609                                  existing_dos_attributes,
2610                                  new_dos_attributes,
2611                                  (unsigned int)smb_fname->st.st_ex_mode,
2612                                  (unsigned int)unx_mode ));
2613                         errno = EACCES;
2614                         return NT_STATUS_ACCESS_DENIED;
2615                 }
2616         }
2617
2618         status = smbd_calculate_access_mask(conn, smb_fname,
2619                                         false,
2620                                         access_mask,
2621                                         &access_mask);
2622         if (!NT_STATUS_IS_OK(status)) {
2623                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2624                         "on file %s returned %s\n",
2625                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2626                 return status;
2627         }
2628
2629         open_access_mask = access_mask;
2630
2631         if (flags2 & O_TRUNC) {
2632                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2633         }
2634
2635         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2636                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2637                     access_mask));
2638
2639         /*
2640          * Note that we ignore the append flag as append does not
2641          * mean the same thing under DOS and Unix.
2642          */
2643
2644         flags = calculate_open_access_flags(access_mask, oplock_request,
2645                                             private_flags);
2646
2647         /*
2648          * Currently we only look at FILE_WRITE_THROUGH for create options.
2649          */
2650
2651 #if defined(O_SYNC)
2652         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2653                 flags2 |= O_SYNC;
2654         }
2655 #endif /* O_SYNC */
2656
2657         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2658                 flags2 |= O_APPEND;
2659         }
2660
2661         if (!posix_open && !CAN_WRITE(conn)) {
2662                 /*
2663                  * We should really return a permission denied error if either
2664                  * O_CREAT or O_TRUNC are set, but for compatibility with
2665                  * older versions of Samba we just AND them out.
2666                  */
2667                 flags2 &= ~(O_CREAT|O_TRUNC);
2668         }
2669
2670         if (first_open_attempt && lp_kernel_oplocks(SNUM(conn))) {
2671                 /*
2672                  * With kernel oplocks the open breaking an oplock
2673                  * blocks until the oplock holder has given up the
2674                  * oplock or closed the file. We prevent this by first
2675                  * trying to open the file with O_NONBLOCK (see "man
2676                  * fcntl" on Linux). For the second try, triggered by
2677                  * an oplock break response, we do not need this
2678                  * anymore.
2679                  *
2680                  * This is true under the assumption that only Samba
2681                  * requests kernel oplocks. Once someone else like
2682                  * NFSv4 starts to use that API, we will have to
2683                  * modify this by communicating with the NFSv4 server.
2684                  */
2685                 flags2 |= O_NONBLOCK;
2686         }
2687
2688         /*
2689          * Ensure we can't write on a read-only share or file.
2690          */
2691
2692         if (flags != O_RDONLY && file_existed &&
2693             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2694                 DEBUG(5,("open_file_ntcreate: write access requested for "
2695                          "file %s on read only %s\n",
2696                          smb_fname_str_dbg(smb_fname),
2697                          !CAN_WRITE(conn) ? "share" : "file" ));
2698                 errno = EACCES;
2699                 return NT_STATUS_ACCESS_DENIED;
2700         }
2701
2702         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2703         fsp->share_access = share_access;
2704         fsp->fh->private_options = private_flags;
2705         fsp->access_mask = open_access_mask; /* We change this to the
2706                                               * requested access_mask after
2707                                               * the open is done. */
2708         fsp->posix_open = posix_open;
2709
2710         if (timeval_is_zero(&request_time)) {
2711                 request_time = fsp->open_time;
2712         }
2713
2714         /*
2715          * Ensure we pay attention to default ACLs on directories if required.
2716          */
2717
2718         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2719             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2720                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2721         }
2722
2723         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2724                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2725                  (unsigned int)flags, (unsigned int)flags2,
2726                  (unsigned int)unx_mode, (unsigned int)access_mask,
2727                  (unsigned int)open_access_mask));
2728
2729         fsp_open = open_file(fsp, conn, req, parent_dir,
2730                              flags|flags2, unx_mode, access_mask,
2731                              open_access_mask, &new_file_created);
2732
2733         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
2734                 struct deferred_open_record state;
2735
2736                 /*
2737                  * EWOULDBLOCK/EAGAIN maps to NETWORK_BUSY.
2738                  */
2739                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
2740                         DEBUG(10, ("FIFO busy\n"));
2741                         return NT_STATUS_NETWORK_BUSY;
2742                 }
2743                 if (req == NULL) {
2744                         DEBUG(10, ("Internal open busy\n"));
2745                         return NT_STATUS_NETWORK_BUSY;
2746                 }
2747
2748                 /*
2749                  * From here on we assume this is an oplock break triggered
2750                  */
2751
2752                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
2753                 if (lck == NULL) {
2754                         state.delayed_for_oplocks = false;
2755                         state.async_open = false;
2756                         state.id = fsp->file_id;
2757                         defer_open(NULL, request_time, timeval_set(0, 0),
2758                                    req, &state);
2759                         DEBUG(10, ("No share mode lock found after "
2760                                    "EWOULDBLOCK, retrying sync\n"));
2761                         return NT_STATUS_SHARING_VIOLATION;
2762                 }
2763
2764                 if (!validate_oplock_types(lck)) {
2765                         smb_panic("validate_oplock_types failed");
2766                 }
2767
2768                 if (delay_for_oplock(fsp, 0, lease, lck, false,
2769                                      create_disposition, first_open_attempt)) {
2770                         schedule_defer_open(lck, fsp->file_id, request_time,
2771                                             req);
2772                         TALLOC_FREE(lck);
2773                         DEBUG(10, ("Sent oplock break request to kernel "
2774                                    "oplock holder\n"));
2775                         return NT_STATUS_SHARING_VIOLATION;
2776                 }
2777
2778                 /*
2779                  * No oplock from Samba around. Immediately retry with
2780                  * a blocking open.
2781                  */
2782                 state.delayed_for_oplocks = false;
2783                 state.async_open = false;
2784                 state.id = fsp->file_id;
2785                 defer_open(lck, request_time, timeval_set(0, 0), req, &state);
2786                 TALLOC_FREE(lck);
2787                 DEBUG(10, ("No Samba oplock around after EWOULDBLOCK. "
2788                            "Retrying sync\n"));
2789                 return NT_STATUS_SHARING_VIOLATION;
2790         }
2791
2792         if (!NT_STATUS_IS_OK(fsp_open)) {
2793                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2794                         schedule_async_open(request_time, req);
2795                 }
2796                 return fsp_open;
2797         }
2798
2799         if (new_file_created) {
2800                 /*
2801                  * As we atomically create using O_CREAT|O_EXCL,
2802                  * then if new_file_created is true, then
2803                  * file_existed *MUST* have been false (even
2804                  * if the file was previously detected as being
2805                  * there).
2806                  */
2807                 file_existed = false;
2808         }
2809
2810         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2811                 /*
2812                  * The file did exist, but some other (local or NFS)
2813                  * process either renamed/unlinked and re-created the
2814                  * file with different dev/ino after we walked the path,
2815                  * but before we did the open. We could retry the
2816                  * open but it's a rare enough case it's easier to
2817                  * just fail the open to prevent creating any problems
2818                  * in the open file db having the wrong dev/ino key.
2819                  */
2820                 fd_close(fsp);
2821                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2822                         "Old (dev=0x%llu, ino =0x%llu). "
2823                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2824                         " with NT_STATUS_ACCESS_DENIED.\n",
2825                          smb_fname_str_dbg(smb_fname),
2826                          (unsigned long long)saved_stat.st_ex_dev,
2827                          (unsigned long long)saved_stat.st_ex_ino,
2828                          (unsigned long long)smb_fname->st.st_ex_dev,
2829                          (unsigned long long)smb_fname->st.st_ex_ino));
2830                 return NT_STATUS_ACCESS_DENIED;
2831         }
2832
2833         old_write_time = smb_fname->st.st_ex_mtime;
2834
2835         /*
2836          * Deal with the race condition where two smbd's detect the
2837          * file doesn't exist and do the create at the same time. One
2838          * of them will win and set a share mode, the other (ie. this
2839          * one) should check if the requested share mode for this
2840          * create is allowed.
2841          */
2842
2843         /*
2844          * Now the file exists and fsp is successfully opened,
2845          * fsp->dev and fsp->inode are valid and should replace the
2846          * dev=0,inode=0 from a non existent file. Spotted by
2847          * Nadav Danieli <nadavd@exanet.com>. JRA.
2848          */
2849
2850         id = fsp->file_id;
2851
2852         lck = get_share_mode_lock(talloc_tos(), id,
2853                                   conn->connectpath,
2854                                   smb_fname, &old_write_time);
2855
2856         if (lck == NULL) {
2857                 DEBUG(0, ("open_file_ntcreate: Could not get share "
2858                           "mode lock for %s\n",
2859                           smb_fname_str_dbg(smb_fname)));
2860                 fd_close(fsp);
2861                 return NT_STATUS_SHARING_VIOLATION;
2862         }
2863
2864         /* Get the types we need to examine. */
2865         if (!validate_oplock_types(lck)) {
2866                 smb_panic("validate_oplock_types failed");
2867         }
2868
2869         if (has_delete_on_close(lck, fsp->name_hash)) {
2870                 TALLOC_FREE(lck);
2871                 fd_close(fsp);
2872                 return NT_STATUS_DELETE_PENDING;
2873         }
2874
2875         status = open_mode_check(conn, lck,
2876                                  access_mask, share_access);
2877
2878         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
2879             (lck->data->num_share_modes > 0)) {
2880                 /*
2881                  * This comes from ancient times out of open_mode_check. I
2882                  * have no clue whether this is still necessary. I can't think
2883                  * of a case where this would actually matter further down in
2884                  * this function. I leave it here for further investigation
2885                  * :-)
2886                  */
2887                 file_existed = true;
2888         }
2889
2890         if ((req != NULL) &&
2891             delay_for_oplock(
2892                     fsp, oplock_request, lease, lck,
2893                     NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION),
2894                     create_disposition, first_open_attempt)) {
2895                 schedule_defer_open(lck, fsp->file_id, request_time, req);
2896                 TALLOC_FREE(lck);
2897                 fd_close(fsp);
2898                 return NT_STATUS_SHARING_VIOLATION;
2899         }
2900
2901         if (!NT_STATUS_IS_OK(status)) {
2902                 uint32 can_access_mask;
2903                 bool can_access = True;
2904
2905                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2906
2907                 /* Check if this can be done with the deny_dos and fcb
2908                  * calls. */
2909                 if (private_flags &
2910                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2911                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2912                         if (req == NULL) {
2913                                 DEBUG(0, ("DOS open without an SMB "
2914                                           "request!\n"));
2915                                 TALLOC_FREE(lck);
2916                                 fd_close(fsp);
2917                                 return NT_STATUS_INTERNAL_ERROR;
2918                         }
2919
2920                         /* Use the client requested access mask here,
2921                          * not the one we open with. */
2922                         status = fcb_or_dos_open(req,
2923                                                  conn,
2924                                                  fsp,
2925                                                  smb_fname,
2926                                                  id,
2927                                                  req->smbpid,
2928                                                  req->vuid,
2929                                                  access_mask,
2930                                                  share_access,
2931                                                  create_options);
2932
2933                         if (NT_STATUS_IS_OK(status)) {
2934                                 TALLOC_FREE(lck);
2935                                 if (pinfo) {
2936                                         *pinfo = FILE_WAS_OPENED;
2937                                 }
2938                                 return NT_STATUS_OK;
2939                         }
2940                 }
2941
2942                 /*
2943                  * This next line is a subtlety we need for
2944                  * MS-Access. If a file open will fail due to share
2945                  * permissions and also for security (access) reasons,
2946                  * we need to return the access failed error, not the
2947                  * share error. We can't open the file due to kernel
2948                  * oplock deadlock (it's possible we failed above on
2949                  * the open_mode_check()) so use a userspace check.
2950                  */
2951
2952                 if (flags & O_RDWR) {
2953                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2954                 } else if (flags & O_WRONLY) {
2955                         can_access_mask = FILE_WRITE_DATA;
2956                 } else {
2957                         can_access_mask = FILE_READ_DATA;
2958                 }
2959
2960                 if (((can_access_mask & FILE_WRITE_DATA) &&
2961                      !CAN_WRITE(conn)) ||
2962                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2963                                                               smb_fname,
2964                                                               false,
2965                                                               can_access_mask))) {
2966                         can_access = False;
2967                 }
2968
2969                 /*
2970                  * If we're returning a share violation, ensure we
2971                  * cope with the braindead 1 second delay (SMB1 only).
2972                  */
2973
2974                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2975                     !conn->sconn->using_smb2 &&
2976                     lp_defer_sharing_violations()) {
2977                         struct timeval timeout;
2978                         struct deferred_open_record state;
2979                         int timeout_usecs;
2980
2981                         /* this is a hack to speed up torture tests
2982                            in 'make test' */
2983                         timeout_usecs = lp_parm_int(SNUM(conn),
2984                                                     "smbd","sharedelay",
2985                                                     SHARING_VIOLATION_USEC_WAIT);
2986
2987                         /* This is a relative time, added to the absolute
2988                            request_time value to get the absolute timeout time.
2989                            Note that if this is the second or greater time we enter
2990                            this codepath for this particular request mid then
2991                            request_time is left as the absolute time of the *first*
2992                            time this request mid was processed. This is what allows
2993                            the request to eventually time out. */
2994
2995                         timeout = timeval_set(0, timeout_usecs);
2996
2997                         /* Nothing actually uses state.delayed_for_oplocks
2998                            but it's handy to differentiate in debug messages
2999                            between a 30 second delay due to oplock break, and
3000                            a 1 second delay for share mode conflicts. */
3001
3002                         state.delayed_for_oplocks = False;
3003                         state.async_open = false;
3004                         state.id = id;
3005
3006                         if ((req != NULL)
3007                             && !request_timed_out(request_time,
3008                                                   timeout)) {
3009                                 defer_open(lck, request_time, timeout,
3010                                            req, &state);
3011                         }
3012                 }
3013
3014                 TALLOC_FREE(lck);
3015                 fd_close(fsp);
3016                 if (can_access) {
3017                         /*
3018                          * We have detected a sharing violation here
3019                          * so return the correct error code
3020                          */
3021                         status = NT_STATUS_SHARING_VIOLATION;
3022                 } else {
3023                         status = NT_STATUS_ACCESS_DENIED;
3024                 }
3025                 return status;
3026         }
3027
3028         /* Should we atomically (to the client at least) truncate ? */
3029         if ((!new_file_created) &&
3030             (flags2 & O_TRUNC) &&
3031             (!S_ISFIFO(fsp->fsp_name->st.st_ex_mode))) {
3032                 int ret;
3033
3034                 ret = vfs_set_filelen(fsp, 0);
3035                 if (ret != 0) {
3036                         status = map_nt_error_from_unix(errno);
3037                         TALLOC_FREE(lck);
3038                         fd_close(fsp);
3039                         return status;
3040                 }
3041         }
3042
3043         /*
3044          * We have the share entry *locked*.....
3045          */
3046
3047         /* Delete streams if create_disposition requires it */
3048         if (!new_file_created && clear_ads(create_disposition) &&
3049             !is_ntfs_stream_smb_fname(smb_fname)) {
3050                 status = delete_all_streams(conn, smb_fname->base_name);
3051                 if (!NT_STATUS_IS_OK(status)) {
3052                         TALLOC_FREE(lck);
3053                         fd_close(fsp);
3054                         return status;
3055                 }
3056         }
3057
3058         /* note that we ignore failure for the following. It is
3059            basically a hack for NFS, and NFS will never set one of
3060            these only read them. Nobody but Samba can ever set a deny
3061            mode and we have already checked our more authoritative
3062            locking database for permission to set this deny mode. If
3063            the kernel refuses the operations then the kernel is wrong.
3064            note that GPFS supports it as well - jmcd */
3065
3066         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
3067                 int ret_flock;
3068                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
3069                 if(ret_flock == -1 ){
3070
3071                         TALLOC_FREE(lck);
3072                         fd_close(fsp);
3073
3074                         return NT_STATUS_SHARING_VIOLATION;
3075                 }
3076         }
3077
3078         /*
3079          * At this point onwards, we can guarantee that the share entry
3080          * is locked, whether we created the file or not, and that the
3081          * deny mode is compatible with all current opens.
3082          */
3083
3084         /*
3085          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3086          * but we don't have to store this - just ignore it on access check.
3087          */
3088         if (conn->sconn->using_smb2) {
3089                 /*
3090                  * SMB2 doesn't return it (according to Microsoft tests).
3091                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
3092                  * File created with access = 0x7 (Read, Write, Delete)
3093                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
3094                  */
3095                 fsp->access_mask = access_mask;
3096         } else {
3097                 /* But SMB1 does. */
3098                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3099         }
3100
3101         if (file_existed) {
3102                 /*
3103                  * stat opens on existing files don't get oplocks.
3104                  * They can get leases.
3105                  *
3106                  * Note that we check for stat open on the *open_access_mask*,
3107                  * i.e. the access mask we actually used to do the open,
3108                  * not the one the client asked for (which is in
3109                  * fsp->access_mask). This is due to the fact that
3110                  * FILE_OVERWRITE and FILE_OVERWRITE_IF add in O_TRUNC,
3111                  * which adds FILE_WRITE_DATA to open_access_mask.
3112                  */
3113                 if (is_stat_open(open_access_mask) && lease == NULL) {
3114                         oplock_request = NO_OPLOCK;
3115                 }
3116         }
3117
3118         if (new_file_created) {
3119                 info = FILE_WAS_CREATED;
3120         } else {
3121                 if (flags2 & O_TRUNC) {
3122                         info = FILE_WAS_OVERWRITTEN;
3123                 } else {
3124                         info = FILE_WAS_OPENED;
3125                 }
3126         }
3127
3128         if (pinfo) {
3129                 *pinfo = info;
3130         }
3131
3132         /*
3133          * Setup the oplock info in both the shared memory and
3134          * file structs.
3135          */
3136         status = grant_fsp_oplock_type(req, fsp, lck, oplock_request, lease);
3137         if (!NT_STATUS_IS_OK(status)) {
3138                 TALLOC_FREE(lck);
3139                 fd_close(fsp);
3140                 return status;
3141         }
3142
3143         /* Handle strange delete on close create semantics. */
3144         if (create_options & FILE_DELETE_ON_CLOSE) {
3145
3146                 status = can_set_delete_on_close(fsp, new_dos_attributes);
3147
3148                 if (!NT_STATUS_IS_OK(status)) {
3149                         /* Remember to delete the mode we just added. */
3150                         del_share_mode(lck, fsp);
3151                         TALLOC_FREE(lck);
3152                         fd_close(fsp);
3153                         return status;
3154                 }
3155                 /* Note that here we set the *inital* delete on close flag,
3156                    not the regular one. The magic gets handled in close. */
3157                 fsp->initial_delete_on_close = True;
3158         }
3159
3160         if (info != FILE_WAS_OPENED) {
3161                 /* Files should be initially set as archive */
3162                 if (lp_map_archive(SNUM(conn)) ||
3163                     lp_store_dos_attributes(SNUM(conn))) {
3164                         if (!posix_open) {
3165                                 if (file_set_dosmode(conn, smb_fname,
3166                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
3167                                             parent_dir, true) == 0) {
3168                                         unx_mode = smb_fname->st.st_ex_mode;
3169                                 }
3170                         }
3171                 }
3172         }
3173
3174         /* Determine sparse flag. */
3175         if (posix_open) {
3176                 /* POSIX opens are sparse by default. */
3177                 fsp->is_sparse = true;
3178         } else {
3179                 fsp->is_sparse = (file_existed &&
3180                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
3181         }
3182
3183         /*
3184          * Take care of inherited ACLs on created files - if default ACL not
3185          * selected.
3186          */
3187
3188         if (!posix_open && new_file_created && !def_acl) {
3189
3190                 int saved_errno = errno; /* We might get ENOSYS in the next
3191                                           * call.. */
3192
3193                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
3194                     errno == ENOSYS) {
3195                         errno = saved_errno; /* Ignore ENOSYS */
3196                 }
3197
3198         } else if (new_unx_mode) {
3199
3200                 int ret = -1;
3201
3202                 /* Attributes need changing. File already existed. */
3203
3204                 {
3205                         int saved_errno = errno; /* We might get ENOSYS in the
3206                                                   * next call.. */
3207                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
3208
3209                         if (ret == -1 && errno == ENOSYS) {
3210                                 errno = saved_errno; /* Ignore ENOSYS */
3211                         } else {
3212                                 DEBUG(5, ("open_file_ntcreate: reset "
3213                                           "attributes of file %s to 0%o\n",
3214                                           smb_fname_str_dbg(smb_fname),
3215                                           (unsigned int)new_unx_mode));
3216                                 ret = 0; /* Don't do the fchmod below. */
3217                         }
3218                 }
3219
3220                 if ((ret == -1) &&
3221                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
3222                         DEBUG(5, ("open_file_ntcreate: failed to reset "
3223                                   "attributes of file %s to 0%o\n",
3224                                   smb_fname_str_dbg(smb_fname),
3225                                   (unsigned int)new_unx_mode));
3226         }
3227
3228         {
3229                 /*
3230                  * Deal with other opens having a modified write time.
3231                  */
3232                 struct timespec write_time = get_share_mode_write_time(lck);
3233
3234                 if (!null_timespec(write_time)) {
3235                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3236                 }
3237         }
3238
3239         TALLOC_FREE(lck);
3240
3241         return NT_STATUS_OK;
3242 }
3243
3244 static NTSTATUS mkdir_internal(connection_struct *conn,
3245                                struct smb_filename *smb_dname,
3246                                uint32 file_attributes)
3247 {
3248         mode_t mode;
3249         char *parent_dir = NULL;
3250         NTSTATUS status;
3251         bool posix_open = false;
3252         bool need_re_stat = false;
3253         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
3254
3255         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
3256                 DEBUG(5,("mkdir_internal: failing share access "
3257                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
3258                 return NT_STATUS_ACCESS_DENIED;
3259         }
3260
3261         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
3262                             NULL)) {
3263                 return NT_STATUS_NO_MEMORY;
3264         }
3265
3266         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
3267                 posix_open = true;
3268                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
3269         } else {
3270                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
3271         }
3272
3273         status = check_parent_access(conn,
3274                                         smb_dname,
3275                                         access_mask);
3276         if(!NT_STATUS_IS_OK(status)) {
3277                 DEBUG(5,("mkdir_internal: check_parent_access "
3278                         "on directory %s for path %s returned %s\n",
3279                         parent_dir,
3280                         smb_dname->base_name,
3281                         nt_errstr(status) ));
3282                 return status;
3283         }
3284
3285         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
3286                 return map_nt_error_from_unix(errno);
3287         }
3288
3289         /* Ensure we're checking for a symlink here.... */
3290         /* We don't want to get caught by a symlink racer. */
3291
3292         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3293                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3294                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3295                 return map_nt_error_from_unix(errno);
3296         }
3297
3298         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
3299                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
3300                           smb_fname_str_dbg(smb_dname)));
3301                 return NT_STATUS_NOT_A_DIRECTORY;
3302         }
3303
3304         if (lp_store_dos_attributes(SNUM(conn))) {
3305                 if (!posix_open) {
3306                         file_set_dosmode(conn, smb_dname,
3307                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
3308                                          parent_dir, true);
3309                 }
3310         }
3311
3312         if (lp_inherit_permissions(SNUM(conn))) {
3313                 inherit_access_posix_acl(conn, parent_dir,
3314                                          smb_dname->base_name, mode);
3315                 need_re_stat = true;
3316         }
3317
3318         if (!posix_open) {
3319                 /*
3320                  * Check if high bits should have been set,
3321                  * then (if bits are missing): add them.
3322                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
3323                  * dir.
3324                  */
3325                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
3326                     (mode & ~smb_dname->st.st_ex_mode)) {
3327                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
3328                                       (smb_dname->st.st_ex_mode |
3329                                           (mode & ~smb_dname->st.st_ex_mode)));
3330                         need_re_stat = true;
3331                 }
3332         }
3333
3334         /* Change the owner if required. */
3335         if (lp_inherit_owner(SNUM(conn))) {
3336                 change_dir_owner_to_parent(conn, parent_dir,
3337                                            smb_dname->base_name,
3338                                            &smb_dname->st);
3339                 need_re_stat = true;
3340         }
3341
3342         if (need_re_stat) {
3343                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3344                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3345                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3346                         return map_nt_error_from_unix(errno);
3347                 }
3348         }
3349
3350         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
3351                      smb_dname->base_name);
3352
3353         return NT_STATUS_OK;
3354 }
3355
3356 /****************************************************************************
3357  Open a directory from an NT SMB call.
3358 ****************************************************************************/
3359
3360 static NTSTATUS open_directory(connection_struct *conn,
3361                                struct smb_request *req,
3362                                struct smb_filename *smb_dname,
3363                                uint32 access_mask,
3364                                uint32 share_access,
3365                                uint32 create_disposition,
3366                                uint32 create_options,
3367                                uint32 file_attributes,
3368                                int *pinfo,
3369                                files_struct **result)
3370 {
3371         files_struct *fsp = NULL;
3372         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
3373         struct share_mode_lock *lck = NULL;
3374         NTSTATUS status;
3375         struct timespec mtimespec;
3376         int info = 0;
3377         bool ok;
3378
3379         if (is_ntfs_stream_smb_fname(smb_dname)) {
3380                 DEBUG(2, ("open_directory: %s is a stream name!\n",
3381                           smb_fname_str_dbg(smb_dname)));
3382                 return NT_STATUS_NOT_A_DIRECTORY;
3383         }
3384
3385         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
3386                 /* Ensure we have a directory attribute. */
3387                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
3388         }
3389
3390         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
3391                  "share_access = 0x%x create_options = 0x%x, "
3392                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
3393                  smb_fname_str_dbg(smb_dname),
3394                  (unsigned int)access_mask,
3395                  (unsigned int)share_access,
3396                  (unsigned int)create_options,
3397                  (unsigned int)create_disposition,
3398                  (unsigned int)file_attributes));
3399
3400         status = smbd_calculate_access_mask(conn, smb_dname, false,
3401                                             access_mask, &access_mask);
3402         if (!NT_STATUS_IS_OK(status)) {
3403                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
3404                         "on file %s returned %s\n",
3405                         smb_fname_str_dbg(smb_dname),
3406                         nt_errstr(status)));
3407                 return status;
3408         }
3409
3410         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3411                         !security_token_has_privilege(get_current_nttok(conn),
3412                                         SEC_PRIV_SECURITY)) {
3413                 DEBUG(10, ("open_directory: open on %s "
3414                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3415                         smb_fname_str_dbg(smb_dname)));
3416                 return NT_STATUS_PRIVILEGE_NOT_HELD;
3417         }
3418
3419         switch( create_disposition ) {
3420                 case FILE_OPEN:
3421
3422                         if (!dir_existed) {
3423                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3424                         }
3425
3426                         info = FILE_WAS_OPENED;
3427                         break;
3428
3429                 case FILE_CREATE:
3430
3431                         /* If directory exists error. If directory doesn't
3432                          * exist create. */
3433
3434                         if (dir_existed) {
3435                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
3436                                 DEBUG(2, ("open_directory: unable to create "
3437                                           "%s. Error was %s\n",
3438                                           smb_fname_str_dbg(smb_dname),
3439                                           nt_errstr(status)));
3440                                 return status;
3441                         }
3442
3443                         status = mkdir_internal(conn, smb_dname,
3444                                                 file_attributes);
3445
3446                         if (!NT_STATUS_IS_OK(status)) {
3447                                 DEBUG(2, ("open_directory: unable to create "
3448                                           "%s. Error was %s\n",
3449                                           smb_fname_str_dbg(smb_dname),
3450                                           nt_errstr(status)));
3451                                 return status;
3452                         }
3453
3454                         info = FILE_WAS_CREATED;
3455                         break;
3456
3457                 case FILE_OPEN_IF:
3458                         /*
3459                          * If directory exists open. If directory doesn't
3460                          * exist create.
3461                          */
3462
3463                         if (dir_existed) {
3464                                 status = NT_STATUS_OK;
3465                                 info = FILE_WAS_OPENED;
3466                         } else {
3467                                 status = mkdir_internal(conn, smb_dname,
3468                                                 file_attributes);
3469
3470                                 if (NT_STATUS_IS_OK(status)) {
3471                                         info = FILE_WAS_CREATED;
3472                                 } else {
3473                                         /* Cope with create race. */
3474                                         if (!NT_STATUS_EQUAL(status,
3475                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
3476                                                 DEBUG(2, ("open_directory: unable to create "
3477                                                         "%s. Error was %s\n",
3478                                                         smb_fname_str_dbg(smb_dname),
3479                                                         nt_errstr(status)));
3480                                                 return status;
3481                                         }
3482                                         info = FILE_WAS_OPENED;
3483                                 }
3484                         }
3485
3486                         break;
3487
3488                 case FILE_SUPERSEDE:
3489                 case FILE_OVERWRITE:
3490                 case FILE_OVERWRITE_IF:
3491                 default:
3492                         DEBUG(5,("open_directory: invalid create_disposition "
3493                                  "0x%x for directory %s\n",
3494                                  (unsigned int)create_disposition,
3495                                  smb_fname_str_dbg(smb_dname)));
3496                         return NT_STATUS_INVALID_PARAMETER;
3497         }
3498
3499         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
3500                 DEBUG(5,("open_directory: %s is not a directory !\n",
3501                          smb_fname_str_dbg(smb_dname)));
3502                 return NT_STATUS_NOT_A_DIRECTORY;
3503         }
3504
3505         if (info == FILE_WAS_OPENED) {
3506                 status = smbd_check_access_rights(conn,
3507                                                 smb_dname,
3508                                                 false,
3509                                                 access_mask);
3510                 if (!NT_STATUS_IS_OK(status)) {
3511                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
3512                                 "file %s failed with %s\n",
3513                                 smb_fname_str_dbg(smb_dname),
3514                                 nt_errstr(status)));
3515                         return status;
3516                 }
3517         }
3518
3519         status = file_new(req, conn, &fsp);
3520         if(!NT_STATUS_IS_OK(status)) {
3521                 return status;
3522         }
3523
3524         /*
3525          * Setup the files_struct for it.
3526          */
3527
3528         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
3529         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
3530         fsp->file_pid = req ? req->smbpid : 0;
3531         fsp->can_lock = False;
3532         fsp->can_read = False;
3533         fsp->can_write = False;
3534
3535         fsp->share_access = share_access;
3536         fsp->fh->private_options = 0;
3537         /*
3538          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3539          */
3540         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3541         fsp->print_file = NULL;
3542         fsp->modified = False;
3543         fsp->oplock_type = NO_OPLOCK;
3544         fsp->sent_oplock_break = NO_BREAK_SENT;
3545         fsp->is_directory = True;
3546         fsp->posix_open = (file_attributes & FILE_FLAG_POSIX_SEMANTICS) ? True : False;
3547         status = fsp_set_smb_fname(fsp, smb_dname);
3548         if (!NT_STATUS_IS_OK(status)) {
3549                 file_free(req, fsp);
3550                 return status;
3551         }
3552
3553         /* Don't store old timestamps for directory
3554            handles in the internal database. We don't
3555            update them in there if new objects
3556            are creaded in the directory. Currently
3557            we only update timestamps on file writes.
3558            See bug #9870.
3559         */
3560         ZERO_STRUCT(mtimespec);
3561
3562         if (access_mask & (FILE_LIST_DIRECTORY|
3563                            FILE_ADD_FILE|
3564                            FILE_ADD_SUBDIRECTORY|
3565                            FILE_TRAVERSE|
3566                            DELETE_ACCESS|
3567                            FILE_DELETE_CHILD)) {
3568 #ifdef O_DIRECTORY
3569                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
3570 #else
3571                 /* POSIX allows us to open a directory with O_RDONLY. */
3572                 status = fd_open(conn, fsp, O_RDONLY, 0);
3573 #endif
3574                 if (!NT_STATUS_IS_OK(status)) {
3575                         DEBUG(5, ("open_directory: Could not open fd for "
3576                                 "%s (%s)\n",
3577                                 smb_fname_str_dbg(smb_dname),
3578                                 nt_errstr(status)));
3579                         file_free(req, fsp);
3580                         return status;
3581                 }
3582         } else {
3583                 fsp->fh->fd = -1;
3584                 DEBUG(10, ("Not opening Directory %s\n",
3585                         smb_fname_str_dbg(smb_dname)));
3586         }
3587
3588         status = vfs_stat_fsp(fsp);
3589         if (!NT_STATUS_IS_OK(status)) {
3590                 fd_close(fsp);
3591                 file_free(req, fsp);
3592                 return status;
3593         }
3594
3595         /* Ensure there was no race condition. */
3596         if (!check_same_stat(&smb_dname->st, &fsp->fsp_name->st)) {
3597                 DEBUG(5,("open_directory: stat struct differs for "
3598                         "directory %s.\n",
3599                         smb_fname_str_dbg(smb_dname)));
3600                 fd_close(fsp);
3601                 file_free(req, fsp);
3602                 return NT_STATUS_ACCESS_DENIED;
3603         }
3604
3605         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
3606                                   conn->connectpath, smb_dname,
3607                                   &mtimespec);
3608
3609         if (lck == NULL) {
3610                 DEBUG(0, ("open_directory: Could not get share mode lock for "
3611                           "%s\n", smb_fname_str_dbg(smb_dname)));
3612                 fd_close(fsp);
3613                 file_free(req, fsp);
3614                 return NT_STATUS_SHARING_VIOLATION;
3615         }
3616
3617         if (has_delete_on_close(lck, fsp->name_hash)) {
3618                 TALLOC_FREE(lck);
3619                 fd_close(fsp);
3620                 file_free(req, fsp);
3621                 return NT_STATUS_DELETE_PENDING;
3622         }
3623
3624         status = open_mode_check(conn, lck,
3625                                  access_mask, share_access);
3626
3627         if (!NT_STATUS_IS_OK(status)) {
3628                 TALLOC_FREE(lck);
3629                 fd_close(fsp);
3630                 file_free(req, fsp);
3631                 return status;
3632         }
3633
3634         ok = set_share_mode(lck, fsp, get_current_uid(conn),
3635                             req ? req->mid : 0, NO_OPLOCK,
3636                             UINT32_MAX);
3637         if (!ok) {
3638                 TALLOC_FREE(lck);
3639                 fd_close(fsp);
3640                 file_free(req, fsp);
3641                 return NT_STATUS_NO_MEMORY;
3642         }
3643
3644         /* For directories the delete on close bit at open time seems
3645            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
3646         if (create_options & FILE_DELETE_ON_CLOSE) {
3647                 status = can_set_delete_on_close(fsp, 0);
3648                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
3649                         del_share_mode(lck, fsp);
3650                         TALLOC_FREE(lck);
3651                         fd_close(fsp);
3652                         file_free(req, fsp);
3653                         return status;
3654                 }
3655
3656                 if (NT_STATUS_IS_OK(status)) {
3657                         /* Note that here we set the *inital* delete on close flag,
3658                            not the regular one. The magic gets handled in close. */
3659                         fsp->initial_delete_on_close = True;
3660                 }
3661         }
3662
3663         {
3664                 /*
3665                  * Deal with other opens having a modified write time. Is this
3666                  * possible for directories?
3667                  */
3668                 struct timespec write_time = get_share_mode_write_time(lck);
3669
3670                 if (!null_timespec(write_time)) {
3671                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3672                 }
3673         }
3674
3675         TALLOC_FREE(lck);
3676
3677         if (pinfo) {
3678                 *pinfo = info;
3679         }
3680
3681         *result = fsp;
3682         return NT_STATUS_OK;
3683 }
3684
3685 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
3686                           struct smb_filename *smb_dname)
3687 {
3688         NTSTATUS status;
3689         files_struct *fsp;
3690
3691         status = SMB_VFS_CREATE_FILE(
3692                 conn,                                   /* conn */
3693                 req,                                    /* req */
3694                 0,                                      /* root_dir_fid */
3695                 smb_dname,                              /* fname */
3696                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3697                 FILE_SHARE_NONE,                        /* share_access */
3698                 FILE_CREATE,                            /* create_disposition*/
3699                 FILE_DIRECTORY_FILE,                    /* create_options */
3700                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
3701                 0,                                      /* oplock_request */
3702                 NULL,                                   /* lease */
3703                 0,                                      /* allocation_size */
3704                 0,                                      /* private_flags */
3705                 NULL,                                   /* sd */
3706                 NULL,                                   /* ea_list */
3707                 &fsp,                                   /* result */
3708                 NULL,                                   /* pinfo */
3709                 NULL, NULL);                            /* create context */
3710
3711         if (NT_STATUS_IS_OK(status)) {
3712                 close_file(req, fsp, NORMAL_CLOSE);
3713         }
3714
3715         return status;
3716 }
3717
3718 /****************************************************************************
3719  Receive notification that one of our open files has been renamed by another
3720  smbd process.
3721 ****************************************************************************/
3722
3723 void msg_file_was_renamed(struct messaging_context *msg,
3724                           void *private_data,
3725                           uint32_t msg_type,
3726                           struct server_id server_id,
3727                           DATA_BLOB *data)
3728 {
3729         files_struct *fsp;
3730         char *frm = (char *)data->data;
3731         struct file_id id;
3732         const char *sharepath;
3733         const char *base_name;
3734         const char *stream_name;
3735         struct smb_filename *smb_fname = NULL;
3736         size_t sp_len, bn_len;
3737         NTSTATUS status;
3738         struct smbd_server_connection *sconn =
3739                 talloc_get_type_abort(private_data,
3740                 struct smbd_server_connection);
3741
3742         if (data->data == NULL
3743             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
3744                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
3745                           (int)data->length));
3746                 return;
3747         }
3748
3749         /* Unpack the message. */
3750         pull_file_id_24(frm, &id);
3751         sharepath = &frm[24];
3752         sp_len = strlen(sharepath);
3753         base_name = sharepath + sp_len + 1;
3754         bn_len = strlen(base_name);
3755         stream_name = sharepath + sp_len + 1 + bn_len + 1;
3756
3757         /* stream_name must always be NULL if there is no stream. */
3758         if (stream_name[0] == '\0') {
3759                 stream_name = NULL;
3760         }
3761
3762         smb_fname = synthetic_smb_fname(talloc_tos(), base_name,
3763                                         stream_name, NULL);
3764         if (smb_fname == NULL) {
3765                 return;
3766         }
3767
3768         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
3769                 "file_id %s\n",
3770                 sharepath, smb_fname_str_dbg(smb_fname),
3771                 file_id_string_tos(&id)));
3772
3773         for(fsp = file_find_di_first(sconn, id); fsp;
3774             fsp = file_find_di_next(fsp)) {
3775                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
3776
3777                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
3778                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
3779                                 smb_fname_str_dbg(smb_fname)));
3780                         status = fsp_set_smb_fname(fsp, smb_fname);
3781                         if (!NT_STATUS_IS_OK(status)) {
3782                                 goto out;
3783                         }
3784                 } else {
3785                         /* TODO. JRA. */
3786                         /* Now we have the complete path we can work out if this is
3787                            actually within this share and adjust newname accordingly. */
3788                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
3789                                 "not sharepath %s) "
3790                                 "%s from %s -> %s\n",
3791                                 fsp->conn->connectpath,
3792                                 sharepath,
3793                                 fsp_fnum_dbg(fsp),
3794                                 fsp_str_dbg(fsp),
3795                                 smb_fname_str_dbg(smb_fname)));
3796                 }
3797         }
3798  out:
3799         TALLOC_FREE(smb_fname);
3800         return;
3801 }
3802
3803 /*
3804  * If a main file is opened for delete, all streams need to be checked for
3805  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
3806  * If that works, delete them all by setting the delete on close and close.
3807  */
3808
3809 NTSTATUS open_streams_for_delete(connection_struct *conn,
3810                                         const char *fname)
3811 {
3812         struct stream_struct *stream_info = NULL;
3813         files_struct **streams = NULL;
3814         int i;
3815         unsigned int num_streams = 0;
3816         TALLOC_CTX *frame = talloc_stackframe();
3817         NTSTATUS status;
3818
3819         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
3820                                 &num_streams, &stream_info);
3821
3822         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
3823             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
3824                 DEBUG(10, ("no streams around\n"));
3825                 TALLOC_FREE(frame);
3826                 return NT_STATUS_OK;
3827         }
3828
3829         if (!NT_STATUS_IS_OK(status)) {
3830                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
3831                            nt_errstr(status)));
3832                 goto fail;
3833         }
3834
3835         DEBUG(10, ("open_streams_for_delete found %d streams\n",
3836                    num_streams));
3837
3838         if (num_streams == 0) {
3839                 TALLOC_FREE(frame);
3840                 return NT_STATUS_OK;
3841         }
3842
3843         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
3844         if (streams == NULL) {
3845                 DEBUG(0, ("talloc failed\n"));
3846                 status = NT_STATUS_NO_MEMORY;
3847                 goto fail;
3848         }
3849
3850         for (i=0; i<num_streams; i++) {
3851                 struct smb_filename *smb_fname;
3852
3853                 if (strequal(stream_info[i].name, "::$DATA")) {
3854                         streams[i] = NULL;
3855                         continue;
3856                 }
3857
3858                 smb_fname = synthetic_smb_fname(
3859                         talloc_tos(), fname, stream_info[i].name, NULL);
3860                 if (smb_fname == NULL) {
3861                         status = NT_STATUS_NO_MEMORY;
3862                         goto fail;
3863                 }
3864
3865                 if (SMB_VFS_STAT(conn, smb_fname) == -1) {
3866                         DEBUG(10, ("Unable to stat stream: %s\n",
3867                                    smb_fname_str_dbg(smb_fname)));
3868                 }
3869
3870                 status = SMB_VFS_CREATE_FILE(
3871                          conn,                  /* conn */
3872                          NULL,                  /* req */
3873                          0,                     /* root_dir_fid */
3874                          smb_fname,             /* fname */
3875                          DELETE_ACCESS,         /* access_mask */
3876                          (FILE_SHARE_READ |     /* share_access */
3877                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
3878                          FILE_OPEN,             /* create_disposition*/
3879                          0,                     /* create_options */
3880                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
3881                          0,                     /* oplock_request */
3882                          NULL,                  /* lease */
3883                          0,                     /* allocation_size */
3884                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
3885                          NULL,                  /* sd */
3886                          NULL,                  /* ea_list */
3887                          &streams[i],           /* result */
3888                          NULL,                  /* pinfo */
3889                          NULL, NULL);           /* create context */
3890
3891                 if (!NT_STATUS_IS_OK(status)) {
3892                         DEBUG(10, ("Could not open stream %s: %s\n",
3893                                    smb_fname_str_dbg(smb_fname),
3894                                    nt_errstr(status)));
3895
3896                         TALLOC_FREE(smb_fname);
3897                         break;
3898                 }
3899                 TALLOC_FREE(smb_fname);
3900         }
3901
3902         /*
3903          * don't touch the variable "status" beyond this point :-)
3904          */
3905
3906         for (i -= 1 ; i >= 0; i--) {
3907                 if (streams[i] == NULL) {
3908                         continue;
3909                 }
3910
3911                 DEBUG(10, ("Closing stream # %d, %s\n", i,
3912                            fsp_str_dbg(streams[i])));
3913                 close_file(NULL, streams[i], NORMAL_CLOSE);
3914         }
3915
3916  fail:
3917         TALLOC_FREE(frame);
3918         return status;
3919 }
3920
3921 /*********************************************************************
3922  Create a default ACL by inheriting from the parent. If no inheritance
3923  from the parent available, don't set anything. This will leave the actual
3924  permissions the new file or directory already got from the filesystem
3925  as the NT ACL when read.
3926 *********************************************************************/
3927
3928 static NTSTATUS inherit_new_acl(files_struct *fsp)
3929 {
3930         TALLOC_CTX *frame = talloc_stackframe();
3931         char *parent_name = NULL;
3932         struct security_descriptor *parent_desc = NULL;
3933         NTSTATUS status = NT_STATUS_OK;
3934         struct security_descriptor *psd = NULL;
3935         const struct dom_sid *owner_sid = NULL;
3936         const struct dom_sid *group_sid = NULL;
3937         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
3938         struct security_token *token = fsp->conn->session_info->security_token;
3939         bool inherit_owner = lp_inherit_owner(SNUM(fsp->conn));
3940         bool inheritable_components = false;
3941         bool try_builtin_administrators = false;
3942         const struct dom_sid *BA_U_sid = NULL;
3943         const struct dom_sid *BA_G_sid = NULL;
3944         bool try_system = false;
3945         const struct dom_sid *SY_U_sid = NULL;
3946         const struct dom_sid *SY_G_sid = NULL;
3947         size_t size = 0;
3948
3949         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
3950                 TALLOC_FREE(frame);
3951                 return NT_STATUS_NO_MEMORY;
3952         }
3953
3954         status = SMB_VFS_GET_NT_ACL(fsp->conn,
3955                                     parent_name,
3956                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
3957                                     frame,
3958                                     &parent_desc);
3959         if (!NT_STATUS_IS_OK(status)) {
3960                 TALLOC_FREE(frame);
3961                 return status;
3962         }
3963
3964         inheritable_components = sd_has_inheritable_components(parent_desc,
3965                                         fsp->is_directory);
3966
3967         if (!inheritable_components && !inherit_owner) {
3968                 TALLOC_FREE(frame);
3969                 /* Nothing to inherit and not setting owner. */
3970                 return NT_STATUS_OK;
3971         }
3972
3973         /* Create an inherited descriptor from the parent. */
3974
3975         if (DEBUGLEVEL >= 10) {
3976                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
3977                         fsp_str_dbg(fsp) ));
3978                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
3979         }
3980
3981         /* Inherit from parent descriptor if "inherit owner" set. */
3982         if (inherit_owner) {
3983                 owner_sid = parent_desc->owner_sid;
3984                 group_sid = parent_desc->group_sid;
3985         }
3986
3987         if (owner_sid == NULL) {
3988                 if (security_token_has_builtin_administrators(token)) {
3989                         try_builtin_administrators = true;
3990                 } else if (security_token_is_system(token)) {
3991                         try_builtin_administrators = true;
3992                         try_system = true;
3993                 }
3994         }
3995
3996         if (group_sid == NULL &&
3997             token->num_sids == PRIMARY_GROUP_SID_INDEX)
3998         {
3999                 if (security_token_is_system(token)) {
4000                         try_builtin_administrators = true;
4001                         try_system = true;
4002                 }
4003         }
4004
4005         if (try_builtin_administrators) {
4006                 struct unixid ids;
4007                 bool ok;
4008
4009                 ZERO_STRUCT(ids);
4010                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
4011                 if (ok) {
4012                         switch (ids.type) {
4013                         case ID_TYPE_BOTH:
4014                                 BA_U_sid = &global_sid_Builtin_Administrators;
4015                                 BA_G_sid = &global_sid_Builtin_Administrators;
4016                                 break;
4017                         case ID_TYPE_UID:
4018                                 BA_U_sid = &global_sid_Builtin_Administrators;
4019                                 break;
4020                         case ID_TYPE_GID:
4021                                 BA_G_sid = &global_sid_Builtin_Administrators;
4022                                 break;
4023                         default:
4024                                 break;
4025                         }
4026                 }
4027         }
4028
4029         if (try_system) {
4030                 struct unixid ids;
4031                 bool ok;
4032
4033                 ZERO_STRUCT(ids);
4034                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
4035                 if (ok) {
4036                         switch (ids.type) {
4037                         case ID_TYPE_BOTH:
4038                                 SY_U_sid = &global_sid_System;
4039                                 SY_G_sid = &global_sid_System;
4040                                 break;
4041                         case ID_TYPE_UID:
4042                                 SY_U_sid = &global_sid_System;
4043                                 break;
4044                         case ID_TYPE_GID:
4045                                 SY_G_sid = &global_sid_System;
4046                                 break;
4047                         default:
4048                                 break;
4049                         }
4050                 }
4051         }
4052
4053         if (owner_sid == NULL) {
4054                 owner_sid = BA_U_sid;
4055         }
4056
4057         if (owner_sid == NULL) {
4058                 owner_sid = SY_U_sid;
4059         }
4060
4061         if (group_sid == NULL) {
4062                 group_sid = SY_G_sid;
4063         }
4064
4065         if (try_system && group_sid == NULL) {
4066                 group_sid = BA_G_sid;
4067         }
4068
4069         if (owner_sid == NULL) {
4070                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4071         }
4072         if (group_sid == NULL) {
4073                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
4074                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
4075                 } else {
4076                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
4077                 }
4078         }
4079
4080         status = se_create_child_secdesc(frame,
4081                         &psd,
4082                         &size,
4083                         parent_desc,
4084                         owner_sid,
4085                         group_sid,
4086                         fsp->is_directory);
4087         if (!NT_STATUS_IS_OK(status)) {
4088                 TALLOC_FREE(frame);
4089                 return status;
4090         }
4091
4092         /* If inheritable_components == false,
4093            se_create_child_secdesc()
4094            creates a security desriptor with a NULL dacl
4095            entry, but with SEC_DESC_DACL_PRESENT. We need
4096            to remove that flag. */
4097
4098         if (!inheritable_components) {
4099                 security_info_sent &= ~SECINFO_DACL;
4100                 psd->type &= ~SEC_DESC_DACL_PRESENT;
4101         }
4102
4103         if (DEBUGLEVEL >= 10) {
4104                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
4105                         fsp_str_dbg(fsp) ));
4106                 NDR_PRINT_DEBUG(security_descriptor, psd);
4107         }
4108
4109         if (inherit_owner) {
4110                 /* We need to be root to force this. */
4111                 become_root();
4112         }
4113         status = SMB_VFS_FSET_NT_ACL(fsp,
4114                         security_info_sent,
4115                         psd);
4116         if (inherit_owner) {
4117                 unbecome_root();
4118         }
4119         TALLOC_FREE(frame);
4120         return status;
4121 }
4122
4123 /*
4124  * If we already have a lease, it must match the new file id. [MS-SMB2]
4125  * 3.3.5.9.8 speaks about INVALID_PARAMETER if an already used lease key is
4126  * used for a different file name.
4127  */
4128
4129 struct lease_match_state {
4130         /* Input parameters. */
4131         TALLOC_CTX *mem_ctx;
4132         const char *servicepath;
4133         const struct smb_filename *fname;
4134         bool file_existed;
4135         struct file_id id;
4136         /* Return parameters. */
4137         uint32_t num_file_ids;
4138         struct file_id *ids;
4139         NTSTATUS match_status;
4140 };
4141
4142 /*************************************************************
4143  File doesn't exist but this lease key+guid is already in use.
4144
4145  This is only allowable in the dynamic share case where the
4146  service path must be different.
4147
4148  There is a small race condition here in the multi-connection
4149  case where a client sends two create calls on different connections,
4150  where the file doesn't exist and one smbd creates the leases_db
4151  entry first, but this will get fixed by the multichannel cleanup
4152  when all identical client_guids get handled by a single smbd.
4153 **************************************************************/
4154
4155 static void lease_match_parser_new_file(
4156         uint32_t num_files,
4157         const struct leases_db_file *files,
4158         struct lease_match_state *state)
4159 {
4160         uint32_t i;
4161
4162         for (i = 0; i < num_files; i++) {
4163                 const struct leases_db_file *f = &files[i];
4164                 if (strequal(state->servicepath, f->servicepath)) {
4165                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4166                         return;
4167                 }
4168         }
4169
4170         /* Dynamic share case. Break leases on all other files. */
4171         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4172                                         num_files,
4173                                         files,
4174                                         &state->ids);
4175         if (!NT_STATUS_IS_OK(state->match_status)) {
4176                 return;
4177         }
4178
4179         state->num_file_ids = num_files;
4180         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4181         return;
4182 }
4183
4184 static void lease_match_parser(
4185         uint32_t num_files,
4186         const struct leases_db_file *files,
4187         void *private_data)
4188 {
4189         struct lease_match_state *state =
4190                 (struct lease_match_state *)private_data;
4191         uint32_t i;
4192
4193         if (!state->file_existed) {
4194                 /*
4195                  * Deal with name mismatch or
4196                  * possible dynamic share case separately
4197                  * to make code clearer.
4198                  */
4199                 lease_match_parser_new_file(num_files,
4200                                                 files,
4201                                                 state);
4202                 return;
4203         }
4204
4205         /* File existed. */
4206         state->match_status = NT_STATUS_OK;
4207
4208         for (i = 0; i < num_files; i++) {
4209                 const struct leases_db_file *f = &files[i];
4210
4211                 /* Everything should be the same. */
4212                 if (!file_id_equal(&state->id, &f->id)) {
4213                         /* This should catch all dynamic share cases. */
4214                         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4215                         break;
4216                 }
4217                 if (!strequal(f->servicepath, state->servicepath)) {
4218                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4219                         break;
4220                 }
4221                 if (!strequal(f->base_name, state->fname->base_name)) {
4222                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4223                         break;
4224                 }
4225                 if (!strequal(f->stream_name, state->fname->stream_name)) {
4226                         state->match_status = NT_STATUS_INVALID_PARAMETER;
4227                         break;
4228                 }
4229         }
4230
4231         if (NT_STATUS_IS_OK(state->match_status)) {
4232                 /*
4233                  * Common case - just opening another handle on a
4234                  * file on a non-dynamic share.
4235                  */
4236                 return;
4237         }
4238
4239         if (NT_STATUS_EQUAL(state->match_status, NT_STATUS_INVALID_PARAMETER)) {
4240                 /* Mismatched path. Error back to client. */
4241                 return;
4242         }
4243
4244         /*
4245          * File id mismatch. Dynamic share case NT_STATUS_OPLOCK_NOT_GRANTED.
4246          * Don't allow leases.
4247          */
4248
4249         state->match_status = leases_db_copy_file_ids(state->mem_ctx,
4250                                         num_files,
4251                                         files,
4252                                         &state->ids);
4253         if (!NT_STATUS_IS_OK(state->match_status)) {
4254                 return;
4255         }
4256
4257         state->num_file_ids = num_files;
4258         state->match_status = NT_STATUS_OPLOCK_NOT_GRANTED;
4259         return;
4260 }
4261
4262 static NTSTATUS lease_match(connection_struct *conn,
4263                             struct smb_request *req,
4264                             struct smb2_lease_key *lease_key,
4265                             const char *servicepath,
4266                             const struct smb_filename *fname,
4267                             uint16_t *p_version,
4268                             uint16_t *p_epoch)
4269 {
4270         struct smbd_server_connection *sconn = req->sconn;
4271         TALLOC_CTX *tos = talloc_tos();
4272         struct lease_match_state state = {
4273                 .mem_ctx = tos,
4274                 .servicepath = servicepath,
4275                 .fname = fname,
4276                 .match_status = NT_STATUS_OK
4277         };
4278         uint32_t i;
4279         NTSTATUS status;
4280
4281         state.file_existed = VALID_STAT(fname->st);
4282         if (state.file_existed) {
4283                 state.id = vfs_file_id_from_sbuf(conn, &fname->st);
4284         } else {
4285                 memset(&state.id, '\0', sizeof(state.id));
4286         }
4287
4288         status = leases_db_parse(&sconn->client->connections->smb2.client.guid,
4289                                  lease_key, lease_match_parser, &state);
4290         if (!NT_STATUS_IS_OK(status)) {
4291                 /*
4292                  * Not found or error means okay: We can make the lease pass
4293                  */
4294                 return NT_STATUS_OK;
4295         }
4296         if (!NT_STATUS_EQUAL(state.match_status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
4297                 /*
4298                  * Anything but NT_STATUS_OPLOCK_NOT_GRANTED, let the caller
4299                  * deal with it.
4300                  */
4301                 return state.match_status;
4302         }
4303
4304         /* We have to break all existing leases. */
4305         for (i = 0; i < state.num_file_ids; i++) {
4306                 struct share_mode_lock *lck;
4307                 struct share_mode_data *d;
4308                 uint32_t j;
4309
4310                 if (file_id_equal(&state.ids[i], &state.id)) {
4311                         /* Don't need to break our own file. */
4312                         continue;
4313                 }
4314
4315                 lck = get_existing_share_mode_lock(talloc_tos(), state.ids[i]);
4316                 if (lck == NULL) {
4317                         /* Race condition - file already closed. */
4318                         continue;
4319                 }
4320                 d = lck->data;
4321                 for (j=0; j<d->num_share_modes; j++) {
4322                         struct share_mode_entry *e = &d->share_modes[j];
4323                         uint32_t e_lease_type = get_lease_type(d, e);
4324                         struct share_mode_lease *l = NULL;
4325
4326                         if (share_mode_stale_pid(d, j)) {
4327                                 continue;
4328                         }
4329
4330                         if (e->op_type == LEASE_OPLOCK) {
4331                                 l = &lck->data->leases[e->lease_idx];
4332                                 if (!smb2_lease_key_equal(&l->lease_key,
4333                                                           lease_key)) {
4334                                         continue;
4335                                 }
4336                                 *p_epoch = l->epoch;
4337                                 *p_version = l->lease_version;
4338                         }
4339
4340                         if (e_lease_type == SMB2_LEASE_NONE) {
4341                                 continue;
4342                         }
4343
4344                         send_break_message(conn->sconn->msg_ctx, e,
4345                                            SMB2_LEASE_NONE);
4346
4347                         /*
4348                          * Windows 7 and 8 lease clients
4349                          * are broken in that they will not
4350                          * respond to lease break requests
4351                          * whilst waiting for an outstanding
4352                          * open request on that lease handle
4353                          * on the same TCP connection, due
4354                          * to holding an internal inode lock.
4355                          *
4356                          * This means we can't reschedule
4357                          * ourselves here, but must return
4358                          * from the create.
4359                          *
4360                          * Work around:
4361                          *
4362                          * Send the breaks and then return
4363                          * SMB2_LEASE_NONE in the lease handle
4364                          * to cause them to acknowledge the
4365                          * lease break. Consulatation with
4366                          * Microsoft engineering confirmed
4367                          * this approach is safe.
4368                          */
4369
4370                 }
4371                 TALLOC_FREE(lck);
4372         }
4373         /*
4374          * Ensure we don't grant anything more so we
4375          * never upgrade.
4376          */
4377         return NT_STATUS_OPLOCK_NOT_GRANTED;
4378 }
4379
4380 /*
4381  * Wrapper around open_file_ntcreate and open_directory
4382  */
4383
4384 static NTSTATUS create_file_unixpath(connection_struct *conn,
4385                                      struct smb_request *req,
4386                                      struct smb_filename *smb_fname,
4387                                      uint32_t access_mask,
4388                                      uint32_t share_access,
4389                                      uint32_t create_disposition,
4390                                      uint32_t create_options,
4391                                      uint32_t file_attributes,
4392                                      uint32_t oplock_request,
4393                                      struct smb2_lease *lease,
4394                                      uint64_t allocation_size,
4395                                      uint32_t private_flags,
4396                                      struct security_descriptor *sd,
4397                                      struct ea_list *ea_list,
4398
4399                                      files_struct **result,
4400                                      int *pinfo)
4401 {
4402         int info = FILE_WAS_OPENED;
4403         files_struct *base_fsp = NULL;
4404         files_struct *fsp = NULL;
4405         NTSTATUS status;
4406
4407         DEBUG(10,("create_file_unixpath: access_mask = 0x%x "
4408                   "file_attributes = 0x%x, share_access = 0x%x, "
4409                   "create_disposition = 0x%x create_options = 0x%x "
4410                   "oplock_request = 0x%x private_flags = 0x%x "
4411                   "ea_list = 0x%p, sd = 0x%p, "
4412                   "fname = %s\n",
4413                   (unsigned int)access_mask,
4414                   (unsigned int)file_attributes,
4415                   (unsigned int)share_access,
4416                   (unsigned int)create_disposition,
4417                   (unsigned int)create_options,
4418                   (unsigned int)oplock_request,
4419                   (unsigned int)private_flags,
4420                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4421
4422         if (create_options & FILE_OPEN_BY_FILE_ID) {
4423                 status = NT_STATUS_NOT_SUPPORTED;
4424                 goto fail;
4425         }
4426
4427         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
4428                 status = NT_STATUS_INVALID_PARAMETER;
4429                 goto fail;
4430         }
4431
4432         if (req == NULL) {
4433                 oplock_request |= INTERNAL_OPEN_ONLY;
4434         }
4435
4436         if (lease != NULL) {
4437                 uint16_t epoch = lease->lease_epoch;
4438                 uint16_t version = lease->lease_version;
4439                 status = lease_match(conn,
4440                                 req,
4441                                 &lease->lease_key,
4442                                 conn->connectpath,
4443                                 smb_fname,
4444                                 &version,
4445                                 &epoch);
4446                 if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
4447                         /* Dynamic share file. No leases and update epoch... */
4448                         lease->lease_state = SMB2_LEASE_NONE;
4449                         lease->lease_epoch = epoch;
4450                         lease->lease_version = version;
4451                 } else if (!NT_STATUS_IS_OK(status)) {
4452                         goto fail;
4453                 }
4454         }
4455
4456         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
4457             && (access_mask & DELETE_ACCESS)
4458             && !is_ntfs_stream_smb_fname(smb_fname)) {
4459                 /*
4460                  * We can't open a file with DELETE access if any of the
4461                  * streams is open without FILE_SHARE_DELETE
4462                  */
4463                 status = open_streams_for_delete(conn, smb_fname->base_name);
4464
4465                 if (!NT_STATUS_IS_OK(status)) {
4466                         goto fail;
4467                 }
4468         }
4469
4470         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
4471                         !security_token_has_privilege(get_current_nttok(conn),
4472                                         SEC_PRIV_SECURITY)) {
4473                 DEBUG(10, ("create_file_unixpath: open on %s "
4474                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
4475                         smb_fname_str_dbg(smb_fname)));
4476                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
4477                 goto fail;
4478         }
4479
4480         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
4481             && is_ntfs_stream_smb_fname(smb_fname)
4482             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
4483                 uint32 base_create_disposition;
4484                 struct smb_filename *smb_fname_base = NULL;
4485
4486                 if (create_options & FILE_DIRECTORY_FILE) {
4487                         status = NT_STATUS_NOT_A_DIRECTORY;
4488                         goto fail;
4489                 }
4490
4491                 switch (create_disposition) {
4492                 case FILE_OPEN:
4493                         base_create_disposition = FILE_OPEN;
4494                         break;
4495                 default:
4496                         base_create_disposition = FILE_OPEN_IF;
4497                         break;
4498                 }
4499
4500                 /* Create an smb_filename with stream_name == NULL. */
4501                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
4502                                                      smb_fname->base_name,
4503                                                      NULL, NULL);
4504                 if (smb_fname_base == NULL) {
4505                         status = NT_STATUS_NO_MEMORY;
4506                         goto fail;
4507                 }
4508
4509                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
4510                         DEBUG(10, ("Unable to stat stream: %s\n",
4511                                    smb_fname_str_dbg(smb_fname_base)));
4512                 } else {
4513                         /*
4514                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
4515                          * We need to check if the requested access mask
4516                          * could be used to open the underlying file (if
4517                          * it existed), as we're passing in zero for the
4518                          * access mask to the base filename.
4519                          */
4520                         status = check_base_file_access(conn,
4521                                                         smb_fname_base,
4522                                                         access_mask);
4523
4524                         if (!NT_STATUS_IS_OK(status)) {
4525                                 DEBUG(10, ("Permission check "
4526                                         "for base %s failed: "
4527                                         "%s\n", smb_fname->base_name,
4528                                         nt_errstr(status)));
4529                                 goto fail;
4530                         }
4531                 }
4532
4533                 /* Open the base file. */
4534                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
4535                                               FILE_SHARE_READ
4536                                               | FILE_SHARE_WRITE
4537                                               | FILE_SHARE_DELETE,
4538                                               base_create_disposition,
4539                                               0, 0, 0, NULL, 0, 0, NULL, NULL,
4540                                               &base_fsp, NULL);
4541                 TALLOC_FREE(smb_fname_base);
4542
4543                 if (!NT_STATUS_IS_OK(status)) {
4544                         DEBUG(10, ("create_file_unixpath for base %s failed: "
4545                                    "%s\n", smb_fname->base_name,
4546                                    nt_errstr(status)));
4547                         goto fail;
4548                 }
4549                 /* we don't need the low level fd */
4550                 fd_close(base_fsp);
4551         }
4552
4553         /*
4554          * If it's a request for a directory open, deal with it separately.
4555          */
4556
4557         if (create_options & FILE_DIRECTORY_FILE) {
4558
4559                 if (create_options & FILE_NON_DIRECTORY_FILE) {
4560                         status = NT_STATUS_INVALID_PARAMETER;
4561                         goto fail;
4562                 }
4563
4564                 /* Can't open a temp directory. IFS kit test. */
4565                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
4566                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
4567                         status = NT_STATUS_INVALID_PARAMETER;
4568                         goto fail;
4569                 }
4570
4571                 /*
4572                  * We will get a create directory here if the Win32
4573                  * app specified a security descriptor in the
4574                  * CreateDirectory() call.
4575                  */
4576
4577                 oplock_request = 0;
4578                 status = open_directory(
4579                         conn, req, smb_fname, access_mask, share_access,
4580                         create_disposition, create_options, file_attributes,
4581                         &info, &fsp);
4582         } else {
4583
4584                 /*
4585                  * Ordinary file case.
4586                  */
4587
4588                 status = file_new(req, conn, &fsp);
4589                 if(!NT_STATUS_IS_OK(status)) {
4590                         goto fail;
4591                 }
4592
4593                 status = fsp_set_smb_fname(fsp, smb_fname);
4594                 if (!NT_STATUS_IS_OK(status)) {
4595                         goto fail;
4596                 }
4597
4598                 if (base_fsp) {
4599                         /*
4600                          * We're opening the stream element of a
4601                          * base_fsp we already opened. Set up the
4602                          * base_fsp pointer.
4603                          */
4604                         fsp->base_fsp = base_fsp;
4605                 }
4606
4607                 if (allocation_size) {
4608                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
4609                                                         allocation_size);
4610                 }
4611
4612                 status = open_file_ntcreate(conn,
4613                                             req,
4614                                             access_mask,
4615                                             share_access,
4616                                             create_disposition,
4617                                             create_options,
4618                                             file_attributes,
4619                                             oplock_request,
4620                                             lease,
4621                                             private_flags,
4622                                             &info,
4623                                             fsp);
4624
4625                 if(!NT_STATUS_IS_OK(status)) {
4626                         file_free(req, fsp);
4627                         fsp = NULL;
4628                 }
4629
4630                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
4631
4632                         /* A stream open never opens a directory */
4633
4634                         if (base_fsp) {
4635                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
4636                                 goto fail;
4637                         }
4638
4639                         /*
4640                          * Fail the open if it was explicitly a non-directory
4641                          * file.
4642                          */
4643
4644                         if (create_options & FILE_NON_DIRECTORY_FILE) {
4645                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
4646                                 goto fail;
4647                         }
4648
4649                         oplock_request = 0;
4650                         status = open_directory(
4651                                 conn, req, smb_fname, access_mask,
4652                                 share_access, create_disposition,
4653                                 create_options, file_attributes,
4654                                 &info, &fsp);
4655                 }
4656         }
4657
4658         if (!NT_STATUS_IS_OK(status)) {
4659                 goto fail;
4660         }
4661
4662         fsp->base_fsp = base_fsp;
4663
4664         if ((ea_list != NULL) &&
4665             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
4666                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
4667                 if (!NT_STATUS_IS_OK(status)) {
4668                         goto fail;
4669                 }
4670         }
4671
4672         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4673                 status = NT_STATUS_ACCESS_DENIED;
4674                 goto fail;
4675         }
4676
4677         /* Save the requested allocation size. */
4678         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
4679                 if (allocation_size
4680                     && (allocation_size > fsp->fsp_name->st.st_ex_size)) {
4681                         fsp->initial_allocation_size = smb_roundup(
4682                                 fsp->conn, allocation_size);
4683                         if (fsp->is_directory) {
4684                                 /* Can't set allocation size on a directory. */
4685                                 status = NT_STATUS_ACCESS_DENIED;
4686                                 goto fail;
4687                         }
4688                         if (vfs_allocate_file_space(
4689                                     fsp, fsp->initial_allocation_size) == -1) {
4690                                 status = NT_STATUS_DISK_FULL;
4691                                 goto fail;
4692                         }
4693                 } else {
4694                         fsp->initial_allocation_size = smb_roundup(
4695                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
4696                 }
4697         } else {
4698                 fsp->initial_allocation_size = 0;
4699         }
4700
4701         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
4702                                 fsp->base_fsp == NULL) {
4703                 if (sd != NULL) {
4704                         /*
4705                          * According to the MS documentation, the only time the security
4706                          * descriptor is applied to the opened file is iff we *created* the
4707                          * file; an existing file stays the same.
4708                          *
4709                          * Also, it seems (from observation) that you can open the file with
4710                          * any access mask but you can still write the sd. We need to override
4711                          * the granted access before we call set_sd
4712                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
4713                          */
4714
4715                         uint32_t sec_info_sent;
4716                         uint32_t saved_access_mask = fsp->access_mask;
4717
4718                         sec_info_sent = get_sec_info(sd);
4719
4720                         fsp->access_mask = FILE_GENERIC_ALL;
4721
4722                         if (sec_info_sent & (SECINFO_OWNER|
4723                                                 SECINFO_GROUP|
4724                                                 SECINFO_DACL|
4725                                                 SECINFO_SACL)) {
4726                                 status = set_sd(fsp, sd, sec_info_sent);
4727                         }
4728
4729                         fsp->access_mask = saved_access_mask;
4730
4731                         if (!NT_STATUS_IS_OK(status)) {
4732                                 goto fail;
4733                         }
4734                 } else if (lp_inherit_acls(SNUM(conn))) {
4735                         /* Inherit from parent. Errors here are not fatal. */
4736                         status = inherit_new_acl(fsp);
4737                         if (!NT_STATUS_IS_OK(status)) {
4738                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
4739                                         fsp_str_dbg(fsp),
4740                                         nt_errstr(status) ));
4741                         }
4742                 }
4743         }
4744
4745         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
4746          && (create_options & FILE_NO_COMPRESSION)
4747          && (info == FILE_WAS_CREATED)) {
4748                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
4749                                                  COMPRESSION_FORMAT_NONE);
4750                 if (!NT_STATUS_IS_OK(status)) {
4751                         DEBUG(1, ("failed to disable compression: %s\n",
4752                                   nt_errstr(status)));
4753                 }
4754         }
4755
4756         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
4757
4758         *result = fsp;
4759         if (pinfo != NULL) {
4760                 *pinfo = info;
4761         }
4762
4763         smb_fname->st = fsp->fsp_name->st;
4764
4765         return NT_STATUS_OK;
4766
4767  fail:
4768         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
4769
4770         if (fsp != NULL) {
4771                 if (base_fsp && fsp->base_fsp == base_fsp) {
4772                         /*
4773                          * The close_file below will close
4774                          * fsp->base_fsp.
4775                          */
4776                         base_fsp = NULL;
4777                 }
4778                 close_file(req, fsp, ERROR_CLOSE);
4779                 fsp = NULL;
4780         }
4781         if (base_fsp != NULL) {
4782                 close_file(req, base_fsp, ERROR_CLOSE);
4783                 base_fsp = NULL;
4784         }
4785         return status;
4786 }
4787
4788 /*
4789  * Calculate the full path name given a relative fid.
4790  */
4791 NTSTATUS get_relative_fid_filename(connection_struct *conn,
4792                                    struct smb_request *req,
4793                                    uint16_t root_dir_fid,
4794                                    const struct smb_filename *smb_fname,
4795                                    struct smb_filename **smb_fname_out)
4796 {
4797         files_struct *dir_fsp;
4798         char *parent_fname = NULL;
4799         char *new_base_name = NULL;
4800         NTSTATUS status;
4801
4802         if (root_dir_fid == 0 || !smb_fname) {
4803                 status = NT_STATUS_INTERNAL_ERROR;
4804                 goto out;
4805         }
4806
4807         dir_fsp = file_fsp(req, root_dir_fid);
4808
4809         if (dir_fsp == NULL) {
4810                 status = NT_STATUS_INVALID_HANDLE;
4811                 goto out;
4812         }
4813
4814         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
4815                 status = NT_STATUS_INVALID_HANDLE;
4816                 goto out;
4817         }
4818
4819         if (!dir_fsp->is_directory) {
4820
4821                 /*
4822                  * Check to see if this is a mac fork of some kind.
4823                  */
4824
4825                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
4826                     is_ntfs_stream_smb_fname(smb_fname)) {
4827                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
4828                         goto out;
4829                 }
4830
4831                 /*
4832                   we need to handle the case when we get a
4833                   relative open relative to a file and the
4834                   pathname is blank - this is a reopen!
4835                   (hint from demyn plantenberg)
4836                 */
4837
4838                 status = NT_STATUS_INVALID_HANDLE;
4839                 goto out;
4840         }
4841
4842         if (ISDOT(dir_fsp->fsp_name->base_name)) {
4843                 /*
4844                  * We're at the toplevel dir, the final file name
4845                  * must not contain ./, as this is filtered out
4846                  * normally by srvstr_get_path and unix_convert
4847                  * explicitly rejects paths containing ./.
4848                  */
4849                 parent_fname = talloc_strdup(talloc_tos(), "");
4850                 if (parent_fname == NULL) {
4851                         status = NT_STATUS_NO_MEMORY;
4852                         goto out;
4853                 }
4854         } else {
4855                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
4856
4857                 /*
4858                  * Copy in the base directory name.
4859                  */
4860
4861                 parent_fname = talloc_array(talloc_tos(), char,
4862                     dir_name_len+2);
4863                 if (parent_fname == NULL) {
4864                         status = NT_STATUS_NO_MEMORY;
4865                         goto out;
4866                 }
4867                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
4868                     dir_name_len+1);
4869
4870                 /*
4871                  * Ensure it ends in a '/'.
4872                  * We used TALLOC_SIZE +2 to add space for the '/'.
4873                  */
4874
4875                 if(dir_name_len
4876                     && (parent_fname[dir_name_len-1] != '\\')
4877                     && (parent_fname[dir_name_len-1] != '/')) {
4878                         parent_fname[dir_name_len] = '/';
4879                         parent_fname[dir_name_len+1] = '\0';
4880                 }
4881         }
4882
4883         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
4884                                         smb_fname->base_name);
4885         if (new_base_name == NULL) {
4886                 status = NT_STATUS_NO_MEMORY;
4887                 goto out;
4888         }
4889
4890         status = filename_convert(req,
4891                                 conn,
4892                                 req->flags2 & FLAGS2_DFS_PATHNAMES,
4893                                 new_base_name,
4894                                 0,
4895                                 NULL,
4896                                 smb_fname_out);
4897         if (!NT_STATUS_IS_OK(status)) {
4898                 goto out;
4899         }
4900
4901  out:
4902         TALLOC_FREE(parent_fname);
4903         TALLOC_FREE(new_base_name);
4904         return status;
4905 }
4906
4907 NTSTATUS create_file_default(connection_struct *conn,
4908                              struct smb_request *req,
4909                              uint16_t root_dir_fid,
4910                              struct smb_filename *smb_fname,
4911                              uint32_t access_mask,
4912                              uint32_t share_access,
4913                              uint32_t create_disposition,
4914                              uint32_t create_options,
4915                              uint32_t file_attributes,
4916                              uint32_t oplock_request,
4917                              struct smb2_lease *lease,
4918                              uint64_t allocation_size,
4919                              uint32_t private_flags,
4920                              struct security_descriptor *sd,
4921                              struct ea_list *ea_list,
4922                              files_struct **result,
4923                              int *pinfo,
4924                              const struct smb2_create_blobs *in_context_blobs,
4925                              struct smb2_create_blobs *out_context_blobs)
4926 {
4927         int info = FILE_WAS_OPENED;
4928         files_struct *fsp = NULL;
4929         NTSTATUS status;
4930         bool stream_name = false;
4931
4932         DEBUG(10,("create_file: access_mask = 0x%x "
4933                   "file_attributes = 0x%x, share_access = 0x%x, "
4934                   "create_disposition = 0x%x create_options = 0x%x "
4935                   "oplock_request = 0x%x "
4936                   "private_flags = 0x%x "
4937                   "root_dir_fid = 0x%x, ea_list = 0x%p, sd = 0x%p, "
4938                   "fname = %s\n",
4939                   (unsigned int)access_mask,
4940                   (unsigned int)file_attributes,
4941                   (unsigned int)share_access,
4942                   (unsigned int)create_disposition,
4943                   (unsigned int)create_options,
4944                   (unsigned int)oplock_request,
4945                   (unsigned int)private_flags,
4946                   (unsigned int)root_dir_fid,
4947                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4948
4949         /*
4950          * Calculate the filename from the root_dir_if if necessary.
4951          */
4952
4953         if (root_dir_fid != 0) {
4954                 struct smb_filename *smb_fname_out = NULL;
4955                 status = get_relative_fid_filename(conn, req, root_dir_fid,
4956                                                    smb_fname, &smb_fname_out);
4957                 if (!NT_STATUS_IS_OK(status)) {
4958                         goto fail;
4959                 }
4960                 smb_fname = smb_fname_out;
4961         }
4962
4963         /*
4964          * Check to see if this is a mac fork of some kind.
4965          */
4966
4967         stream_name = is_ntfs_stream_smb_fname(smb_fname);
4968         if (stream_name) {
4969                 enum FAKE_FILE_TYPE fake_file_type;
4970
4971                 fake_file_type = is_fake_file(smb_fname);
4972
4973                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
4974
4975                         /*
4976                          * Here we go! support for changing the disk quotas
4977                          * --metze
4978                          *
4979                          * We need to fake up to open this MAGIC QUOTA file
4980                          * and return a valid FID.
4981                          *
4982                          * w2k close this file directly after openening xp
4983                          * also tries a QUERY_FILE_INFO on the file and then
4984                          * close it
4985                          */
4986                         status = open_fake_file(req, conn, req->vuid,
4987                                                 fake_file_type, smb_fname,
4988                                                 access_mask, &fsp);
4989                         if (!NT_STATUS_IS_OK(status)) {
4990                                 goto fail;
4991                         }
4992
4993                         ZERO_STRUCT(smb_fname->st);
4994                         goto done;
4995                 }
4996
4997                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
4998                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
4999                         goto fail;
5000                 }
5001         }
5002
5003         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
5004                 int ret;
5005                 smb_fname->stream_name = NULL;
5006                 /* We have to handle this error here. */
5007                 if (create_options & FILE_DIRECTORY_FILE) {
5008                         status = NT_STATUS_NOT_A_DIRECTORY;
5009                         goto fail;
5010                 }
5011                 if (lp_posix_pathnames()) {
5012                         ret = SMB_VFS_LSTAT(conn, smb_fname);
5013                 } else {
5014                         ret = SMB_VFS_STAT(conn, smb_fname);
5015                 }
5016
5017                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
5018                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
5019                         goto fail;
5020                 }
5021         }
5022
5023         status = create_file_unixpath(
5024                 conn, req, smb_fname, access_mask, share_access,
5025                 create_disposition, create_options, file_attributes,
5026                 oplock_request, lease, allocation_size, private_flags,
5027                 sd, ea_list,
5028                 &fsp, &info);
5029
5030         if (!NT_STATUS_IS_OK(status)) {
5031                 goto fail;
5032         }
5033
5034  done:
5035         DEBUG(10, ("create_file: info=%d\n", info));
5036
5037         *result = fsp;
5038         if (pinfo != NULL) {
5039                 *pinfo = info;
5040         }
5041         return NT_STATUS_OK;
5042
5043  fail:
5044         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
5045
5046         if (fsp != NULL) {
5047                 close_file(req, fsp, ERROR_CLOSE);
5048                 fsp = NULL;
5049         }
5050         return status;
5051 }