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
  39 extern const struct generic_mapping file_generic_mapping;
  40
  41 struct deferred_open_record {
  42         bool delayed_for_oplocks;
  43         bool async_open;
  44         struct file_id id;
  45 };
  46
  47 /****************************************************************************
  48  If the requester wanted DELETE_ACCESS and was rejected because
  49  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  50  overrides this.
  51 ****************************************************************************/
  52
  53 static bool parent_override_delete(connection_struct *conn,
  54                                         const struct smb_filename *smb_fname,
  55                                         uint32_t access_mask,
  56                                         uint32_t rejected_mask)
  57 {
  58         if ((access_mask & DELETE_ACCESS) &&
  59                     (rejected_mask & DELETE_ACCESS) &&
  60                     can_delete_file_in_directory(conn, smb_fname)) {
  61                 return true;
  62         }
  63         return false;
  64 }
  65
  66 /****************************************************************************
  67  Check if we have open rights.
  68 ****************************************************************************/
  69
  70 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  71                                 const struct smb_filename *smb_fname,
  72                                 bool use_privs,
  73                                 uint32_t access_mask)
  74 {
  75         /* Check if we have rights to open. */
  76         NTSTATUS status;
  77         struct security_descriptor *sd = NULL;
  78         uint32_t rejected_share_access;
  79         uint32_t rejected_mask = access_mask;
  80         uint32_t do_not_check_mask = 0;
  81
  82         rejected_share_access = access_mask & ~(conn->share_access);
  83
  84         if (rejected_share_access) {
  85                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  86                         "on %s (0x%x)\n",
  87                         (unsigned int)access_mask,
  88                         smb_fname_str_dbg(smb_fname),
  89                         (unsigned int)rejected_share_access ));
  90                 return NT_STATUS_ACCESS_DENIED;
  91         }
  92
  93         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
  94                 /* I'm sorry sir, I didn't know you were root... */
  95                 DEBUG(10,("smbd_check_access_rights: root override "
  96                         "on %s. Granting 0x%x\n",
  97                         smb_fname_str_dbg(smb_fname),
  98                         (unsigned int)access_mask ));
  99                 return NT_STATUS_OK;
 100         }
 101
 102         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 103                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 104                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 105                         smb_fname_str_dbg(smb_fname),
 106                         (unsigned int)access_mask ));
 107                 return NT_STATUS_OK;
 108         }
 109
 110         if (access_mask == DELETE_ACCESS &&
 111                         VALID_STAT(smb_fname->st) &&
 112                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 113                 /* We can always delete a symlink. */
 114                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 115                         "on DELETE_ACCESS on symlink %s.\n",
 116                         smb_fname_str_dbg(smb_fname) ));
 117                 return NT_STATUS_OK;
 118         }
 119
 120         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
 121                         (SECINFO_OWNER |
 122                         SECINFO_GROUP |
 123                          SECINFO_DACL), talloc_tos(), &sd);
 124
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 127                         "on %s: %s\n",
 128                         smb_fname_str_dbg(smb_fname),
 129                         nt_errstr(status)));
 130
 131                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 132                         goto access_denied;
 133                 }
 134
 135                 return status;
 136         }
 137
 138         /*
 139          * If we can access the path to this file, by
 140          * default we have FILE_READ_ATTRIBUTES from the
 141          * containing directory. See the section:
 142          * "Algorithm to Check Access to an Existing File"
 143          * in MS-FSA.pdf.
 144          *
 145          * se_file_access_check() also takes care of
 146          * owner WRITE_DAC and READ_CONTROL.
 147          */
 148         do_not_check_mask = FILE_READ_ATTRIBUTES;
 149
 150         /*
 151          * Samba 3.6 and earlier granted execute access even
 152          * if the ACL did not contain execute rights.
 153          * Samba 4.0 is more correct and checks it.
 154          * The compatibilty mode allows to skip this check
 155          * to smoothen upgrades.
 156          */
 157         if (lp_acl_allow_execute_always(SNUM(conn))) {
 158                 do_not_check_mask |= FILE_EXECUTE;
 159         }
 160
 161         status = se_file_access_check(sd,
 162                                 get_current_nttok(conn),
 163                                 use_privs,
 164                                 (access_mask & ~do_not_check_mask),
 165                                 &rejected_mask);
 166
 167         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 168                 "0x%x returning 0x%x (%s)\n",
 169                 smb_fname_str_dbg(smb_fname),
 170                 (unsigned int)access_mask,
 171                 (unsigned int)rejected_mask,
 172                 nt_errstr(status) ));
 173
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 if (DEBUGLEVEL >= 10) {
 176                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 177                                 smb_fname_str_dbg(smb_fname) ));
 178                         NDR_PRINT_DEBUG(security_descriptor, sd);
 179                 }
 180         }
 181
 182         TALLOC_FREE(sd);
 183
 184         if (NT_STATUS_IS_OK(status) ||
 185                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 186                 return status;
 187         }
 188
 189         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 190
 191   access_denied:
 192
 193         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 194                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 195                         !lp_store_dos_attributes(SNUM(conn)) &&
 196                         (lp_map_readonly(SNUM(conn)) ||
 197                         lp_map_archive(SNUM(conn)) ||
 198                         lp_map_hidden(SNUM(conn)) ||
 199                         lp_map_system(SNUM(conn)))) {
 200                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 201
 202                 DEBUG(10,("smbd_check_access_rights: "
 203                         "overrode "
 204                         "FILE_WRITE_ATTRIBUTES "
 205                         "on file %s\n",
 206                         smb_fname_str_dbg(smb_fname)));
 207         }
 208
 209         if (parent_override_delete(conn,
 210                                 smb_fname,
 211                                 access_mask,
 212                                 rejected_mask)) {
 213                 /* Were we trying to do an open
 214                  * for delete and didn't get DELETE
 215                  * access (only) ? Check if the
 216                  * directory allows DELETE_CHILD.
 217                  * See here:
 218                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 219                  * for details. */
 220
 221                 rejected_mask &= ~DELETE_ACCESS;
 222
 223                 DEBUG(10,("smbd_check_access_rights: "
 224                         "overrode "
 225                         "DELETE_ACCESS on "
 226                         "file %s\n",
 227                         smb_fname_str_dbg(smb_fname)));
 228         }
 229
 230         if (rejected_mask != 0) {
 231                 return NT_STATUS_ACCESS_DENIED;
 232         }
 233         return NT_STATUS_OK;
 234 }
 235
 236 static NTSTATUS check_parent_access(struct connection_struct *conn,
 237                                 struct smb_filename *smb_fname,
 238                                 uint32_t access_mask)
 239 {
 240         NTSTATUS status;
 241         char *parent_dir = NULL;
 242         struct security_descriptor *parent_sd = NULL;
 243         uint32_t access_granted = 0;
 244
 245         if (!parent_dirname(talloc_tos(),
 246                                 smb_fname->base_name,
 247                                 &parent_dir,
 248                                 NULL)) {
 249                 return NT_STATUS_NO_MEMORY;
 250         }
 251
 252         if (get_current_uid(conn) == (uid_t)0) {
 253                 /* I'm sorry sir, I didn't know you were root... */
 254                 DEBUG(10,("check_parent_access: root override "
 255                         "on %s. Granting 0x%x\n",
 256                         smb_fname_str_dbg(smb_fname),
 257                         (unsigned int)access_mask ));
 258                 return NT_STATUS_OK;
 259         }
 260
 261         status = SMB_VFS_GET_NT_ACL(conn,
 262                                 parent_dir,
 263                                 SECINFO_DACL,
 264                                     talloc_tos(),
 265                                 &parent_sd);
 266
 267         if (!NT_STATUS_IS_OK(status)) {
 268                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 269                         "%s with error %s\n",
 270                         parent_dir,
 271                         nt_errstr(status)));
 272                 return status;
 273         }
 274
 275         /*
 276          * If we can access the path to this file, by
 277          * default we have FILE_READ_ATTRIBUTES from the
 278          * containing directory. See the section:
 279          * "Algorithm to Check Access to an Existing File"
 280          * in MS-FSA.pdf.
 281          *
 282          * se_file_access_check() also takes care of
 283          * owner WRITE_DAC and READ_CONTROL.
 284          */
 285         status = se_file_access_check(parent_sd,
 286                                 get_current_nttok(conn),
 287                                 false,
 288                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 289                                 &access_granted);
 290         if(!NT_STATUS_IS_OK(status)) {
 291                 DEBUG(5,("check_parent_access: access check "
 292                         "on directory %s for "
 293                         "path %s for mask 0x%x returned (0x%x) %s\n",
 294                         parent_dir,
 295                         smb_fname->base_name,
 296                         access_mask,
 297                         access_granted,
 298                         nt_errstr(status) ));
 299                 return status;
 300         }
 301
 302         return NT_STATUS_OK;
 303 }
 304
 305 /****************************************************************************
 306  Ensure when opening a base file for a stream open that we have permissions
 307  to do so given the access mask on the base file.
 308 ****************************************************************************/
 309
 310 static NTSTATUS check_base_file_access(struct connection_struct *conn,
 311                                 struct smb_filename *smb_fname,
 312                                 uint32_t access_mask)
 313 {
 314         NTSTATUS status;
 315
 316         status = smbd_calculate_access_mask(conn, smb_fname,
 317                                         false,
 318                                         access_mask,
 319                                         &access_mask);
 320         if (!NT_STATUS_IS_OK(status)) {
 321                 DEBUG(10, ("smbd_calculate_access_mask "
 322                         "on file %s returned %s\n",
 323                         smb_fname_str_dbg(smb_fname),
 324                         nt_errstr(status)));
 325                 return status;
 326         }
 327
 328         if (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA)) {
 329                 uint32_t dosattrs;
 330                 if (!CAN_WRITE(conn)) {
 331                         return NT_STATUS_ACCESS_DENIED;
 332                 }
 333                 dosattrs = dos_mode(conn, smb_fname);
 334                 if (IS_DOS_READONLY(dosattrs)) {
 335                         return NT_STATUS_ACCESS_DENIED;
 336                 }
 337         }
 338
 339         return smbd_check_access_rights(conn,
 340                                         smb_fname,
 341                                         false,
 342                                         access_mask);
 343 }
 344
 345 /****************************************************************************
 346  fd support routines - attempt to do a dos_open.
 347 ****************************************************************************/
 348
 349 NTSTATUS fd_open(struct connection_struct *conn,
 350                  files_struct *fsp,
 351                  int flags,
 352                  mode_t mode)
 353 {
 354         struct smb_filename *smb_fname = fsp->fsp_name;
 355         NTSTATUS status = NT_STATUS_OK;
 356
 357 #ifdef O_NOFOLLOW
 358         /*
 359          * Never follow symlinks on a POSIX client. The
 360          * client should be doing this.
 361          */
 362
 363         if (fsp->posix_open || !lp_follow_symlinks(SNUM(conn))) {
 364                 flags |= O_NOFOLLOW;
 365         }
 366 #endif
 367
 368         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 369         if (fsp->fh->fd == -1) {
 370                 int posix_errno = errno;
 371 #ifdef O_NOFOLLOW
 372 #if defined(ENOTSUP) && defined(OSF1)
 373                 /* handle special Tru64 errno */
 374                 if (errno == ENOTSUP) {
 375                         posix_errno = ELOOP;
 376                 }
 377 #endif /* ENOTSUP */
 378 #ifdef EFTYPE
 379                 /* fix broken NetBSD errno */
 380                 if (errno == EFTYPE) {
 381                         posix_errno = ELOOP;
 382                 }
 383 #endif /* EFTYPE */
 384                 /* fix broken FreeBSD errno */
 385                 if (errno == EMLINK) {
 386                         posix_errno = ELOOP;
 387                 }
 388 #endif /* O_NOFOLLOW */
 389                 status = map_nt_error_from_unix(posix_errno);
 390                 if (errno == EMFILE) {
 391                         static time_t last_warned = 0L;
 392
 393                         if (time((time_t *) NULL) > last_warned) {
 394                                 DEBUG(0,("Too many open files, unable "
 395                                         "to open more!  smbd's max "
 396                                         "open files = %d\n",
 397                                         lp_max_open_files()));
 398                                 last_warned = time((time_t *) NULL);
 399                         }
 400                 }
 401
 402         }
 403
 404         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 405                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 406                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 407
 408         return status;
 409 }
 410
 411 /****************************************************************************
 412  Close the file associated with a fsp.
 413 ****************************************************************************/
 414
 415 NTSTATUS fd_close(files_struct *fsp)
 416 {
 417         int ret;
 418
 419         if (fsp->dptr) {
 420                 dptr_CloseDir(fsp);
 421         }
 422         if (fsp->fh->fd == -1) {
 423                 return NT_STATUS_OK; /* What we used to call a stat open. */
 424         }
 425         if (fsp->fh->ref_count > 1) {
 426                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 427         }
 428
 429         ret = SMB_VFS_CLOSE(fsp);
 430         fsp->fh->fd = -1;
 431         if (ret == -1) {
 432                 return map_nt_error_from_unix(errno);
 433         }
 434         return NT_STATUS_OK;
 435 }
 436
 437 /****************************************************************************
 438  Change the ownership of a file to that of the parent directory.
 439  Do this by fd if possible.
 440 ****************************************************************************/
 441
 442 void change_file_owner_to_parent(connection_struct *conn,
 443                                         const char *inherit_from_dir,
 444                                         files_struct *fsp)
 445 {
 446         struct smb_filename *smb_fname_parent;
 447         int ret;
 448
 449         smb_fname_parent = synthetic_smb_fname(talloc_tos(), inherit_from_dir,
 450                                                NULL, NULL);
 451         if (smb_fname_parent == NULL) {
 452                 return;
 453         }
 454
 455         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 456         if (ret == -1) {
 457                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 458                          "directory %s. Error was %s\n",
 459                          smb_fname_str_dbg(smb_fname_parent),
 460                          strerror(errno)));
 461                 TALLOC_FREE(smb_fname_parent);
 462                 return;
 463         }
 464
 465         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 466                 /* Already this uid - no need to change. */
 467                 DEBUG(10,("change_file_owner_to_parent: file %s "
 468                         "is already owned by uid %d\n",
 469                         fsp_str_dbg(fsp),
 470                         (int)fsp->fsp_name->st.st_ex_uid ));
 471                 TALLOC_FREE(smb_fname_parent);
 472                 return;
 473         }
 474
 475         become_root();
 476         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 477         unbecome_root();
 478         if (ret == -1) {
 479                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 480                          "file %s to parent directory uid %u. Error "
 481                          "was %s\n", fsp_str_dbg(fsp),
 482                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 483                          strerror(errno) ));
 484         } else {
 485                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 486                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 487                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 488                 /* Ensure the uid entry is updated. */
 489                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 490         }
 491
 492         TALLOC_FREE(smb_fname_parent);
 493 }
 494
 495 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 496                                        const char *inherit_from_dir,
 497                                        const char *fname,
 498                                        SMB_STRUCT_STAT *psbuf)
 499 {
 500         struct smb_filename *smb_fname_parent;
 501         struct smb_filename *smb_fname_cwd = NULL;
 502         char *saved_dir = NULL;
 503         TALLOC_CTX *ctx = talloc_tos();
 504         NTSTATUS status = NT_STATUS_OK;
 505         int ret;
 506
 507         smb_fname_parent = synthetic_smb_fname(ctx, inherit_from_dir,
 508                                                NULL, NULL);
 509         if (smb_fname_parent == NULL) {
 510                 return NT_STATUS_NO_MEMORY;
 511         }
 512
 513         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 514         if (ret == -1) {
 515                 status = map_nt_error_from_unix(errno);
 516                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 517                          "directory %s. Error was %s\n",
 518                          smb_fname_str_dbg(smb_fname_parent),
 519                          strerror(errno)));
 520                 goto out;
 521         }
 522
 523         /* We've already done an lstat into psbuf, and we know it's a
 524            directory. If we can cd into the directory and the dev/ino
 525            are the same then we can safely chown without races as
 526            we're locking the directory in place by being in it.  This
 527            should work on any UNIX (thanks tridge :-). JRA.
 528         */
 529
 530         saved_dir = vfs_GetWd(ctx,conn);
 531         if (!saved_dir) {
 532                 status = map_nt_error_from_unix(errno);
 533                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 534                          "current working directory. Error was %s\n",
 535                          strerror(errno)));
 536                 goto out;
 537         }
 538
 539         /* Chdir into the new path. */
 540         if (vfs_ChDir(conn, fname) == -1) {
 541                 status = map_nt_error_from_unix(errno);
 542                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 543                          "current working directory to %s. Error "
 544                          "was %s\n", fname, strerror(errno) ));
 545                 goto chdir;
 546         }
 547
 548         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL);
 549         if (smb_fname_cwd == NULL) {
 550                 status = NT_STATUS_NO_MEMORY;
 551                 goto chdir;
 552         }
 553
 554         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 555         if (ret == -1) {
 556                 status = map_nt_error_from_unix(errno);
 557                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 558                          "directory '.' (%s) Error was %s\n",
 559                          fname, strerror(errno)));
 560                 goto chdir;
 561         }
 562
 563         /* Ensure we're pointing at the same place. */
 564         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 565             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 566                 DEBUG(0,("change_dir_owner_to_parent: "
 567                          "device/inode on directory %s changed. "
 568                          "Refusing to chown !\n", fname ));
 569                 status = NT_STATUS_ACCESS_DENIED;
 570                 goto chdir;
 571         }
 572
 573         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 574                 /* Already this uid - no need to change. */
 575                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 576                         "is already owned by uid %d\n",
 577                         fname,
 578                         (int)smb_fname_cwd->st.st_ex_uid ));
 579                 status = NT_STATUS_OK;
 580                 goto chdir;
 581         }
 582
 583         become_root();
 584         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
 585                             (gid_t)-1);
 586         unbecome_root();
 587         if (ret == -1) {
 588                 status = map_nt_error_from_unix(errno);
 589                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
 590                           "directory %s to parent directory uid %u. "
 591                           "Error was %s\n", fname,
 592                           (unsigned int)smb_fname_parent->st.st_ex_uid,
 593                           strerror(errno) ));
 594         } else {
 595                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
 596                         "directory %s to parent directory uid %u.\n",
 597                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
 598                 /* Ensure the uid entry is updated. */
 599                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
 600         }
 601
 602  chdir:
 603         vfs_ChDir(conn,saved_dir);
 604  out:
 605         TALLOC_FREE(smb_fname_parent);
 606         TALLOC_FREE(smb_fname_cwd);
 607         return status;
 608 }
 609
 610 /****************************************************************************
 611  Open a file - returning a guaranteed ATOMIC indication of if the
 612  file was created or not.
 613 ****************************************************************************/
 614
 615 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
 616                         files_struct *fsp,
 617                         int flags,
 618                         mode_t mode,
 619                         bool *file_created)
 620 {
 621         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 622         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 623
 624         *file_created = false;
 625
 626         if (!(flags & O_CREAT)) {
 627                 /*
 628                  * We're not creating the file, just pass through.
 629                  */
 630                 return fd_open(conn, fsp, flags, mode);
 631         }
 632
 633         if (flags & O_EXCL) {
 634                 /*
 635                  * Fail if already exists, just pass through.
 636                  */
 637                 status = fd_open(conn, fsp, flags, mode);
 638
 639                 /*
 640                  * Here we've opened with O_CREAT|O_EXCL. If that went
 641                  * NT_STATUS_OK, we *know* we created this file.
 642                  */
 643                 *file_created = NT_STATUS_IS_OK(status);
 644
 645                 return status;
 646         }
 647
 648         /*
 649          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
 650          * To know absolutely if we created the file or not,
 651          * we can never call O_CREAT without O_EXCL. So if
 652          * we think the file existed, try without O_CREAT|O_EXCL.
 653          * If we think the file didn't exist, try with
 654          * O_CREAT|O_EXCL. Keep bouncing between these two
 655          * requests until either the file is created, or
 656          * opened. Either way, we keep going until we get
 657          * a returnable result (error, or open/create).
 658          */
 659
 660         while(1) {
 661                 int curr_flags = flags;
 662
 663                 if (file_existed) {
 664                         /* Just try open, do not create. */
 665                         curr_flags &= ~(O_CREAT);
 666                         status = fd_open(conn, fsp, curr_flags, mode);
 667                         if (NT_STATUS_EQUAL(status,
 668                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 669                                 /*
 670                                  * Someone deleted it in the meantime.
 671                                  * Retry with O_EXCL.
 672                                  */
 673                                 file_existed = false;
 674                                 DEBUG(10,("fd_open_atomic: file %s existed. "
 675                                         "Retry.\n",
 676                                         smb_fname_str_dbg(fsp->fsp_name)));
 677                                         continue;
 678                         }
 679                 } else {
 680                         /* Try create exclusively, fail if it exists. */
 681                         curr_flags |= O_EXCL;
 682                         status = fd_open(conn, fsp, curr_flags, mode);
 683                         if (NT_STATUS_EQUAL(status,
 684                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
 685                                 /*
 686                                  * Someone created it in the meantime.
 687                                  * Retry without O_CREAT.
 688                                  */
 689                                 file_existed = true;
 690                                 DEBUG(10,("fd_open_atomic: file %s "
 691                                         "did not exist. Retry.\n",
 692                                         smb_fname_str_dbg(fsp->fsp_name)));
 693                                 continue;
 694                         }
 695                         if (NT_STATUS_IS_OK(status)) {
 696                                 /*
 697                                  * Here we've opened with O_CREAT|O_EXCL
 698                                  * and got success. We *know* we created
 699                                  * this file.
 700                                  */
 701                                 *file_created = true;
 702                         }
 703                 }
 704                 /* Create is done, or failed. */
 705                 break;
 706         }
 707         return status;
 708 }
 709
 710 /****************************************************************************
 711  Open a file.
 712 ****************************************************************************/
 713
 714 static NTSTATUS open_file(files_struct *fsp,
 715                           connection_struct *conn,
 716                           struct smb_request *req,
 717                           const char *parent_dir,
 718                           int flags,
 719                           mode_t unx_mode,
 720                           uint32 access_mask, /* client requested access mask. */
 721                           uint32 open_access_mask, /* what we're actually using in the open. */
 722                           bool *p_file_created)
 723 {
 724         struct smb_filename *smb_fname = fsp->fsp_name;
 725         NTSTATUS status = NT_STATUS_OK;
 726         int accmode = (flags & O_ACCMODE);
 727         int local_flags = flags;
 728         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 729
 730         fsp->fh->fd = -1;
 731         errno = EPERM;
 732
 733         /* Check permissions */
 734
 735         /*
 736          * This code was changed after seeing a client open request
 737          * containing the open mode of (DENY_WRITE/read-only) with
 738          * the 'create if not exist' bit set. The previous code
 739          * would fail to open the file read only on a read-only share
 740          * as it was checking the flags parameter  directly against O_RDONLY,
 741          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
 742          * JRA.
 743          */
 744
 745         if (!CAN_WRITE(conn)) {
 746                 /* It's a read-only share - fail if we wanted to write. */
 747                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
 748                         DEBUG(3,("Permission denied opening %s\n",
 749                                  smb_fname_str_dbg(smb_fname)));
 750                         return NT_STATUS_ACCESS_DENIED;
 751                 }
 752                 if (flags & O_CREAT) {
 753                         /* We don't want to write - but we must make sure that
 754                            O_CREAT doesn't create the file if we have write
 755                            access into the directory.
 756                         */
 757                         flags &= ~(O_CREAT|O_EXCL);
 758                         local_flags &= ~(O_CREAT|O_EXCL);
 759                 }
 760         }
 761
 762         /*
 763          * This little piece of insanity is inspired by the
 764          * fact that an NT client can open a file for O_RDONLY,
 765          * but set the create disposition to FILE_EXISTS_TRUNCATE.
 766          * If the client *can* write to the file, then it expects to
 767          * truncate the file, even though it is opening for readonly.
 768          * Quicken uses this stupid trick in backup file creation...
 769          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
 770          * for helping track this one down. It didn't bite us in 2.0.x
 771          * as we always opened files read-write in that release. JRA.
 772          */
 773
 774         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
 775                 DEBUG(10,("open_file: truncate requested on read-only open "
 776                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
 777                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
 778         }
 779
 780         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
 781             (!file_existed && (local_flags & O_CREAT)) ||
 782             ((local_flags & O_TRUNC) == O_TRUNC) ) {
 783                 const char *wild;
 784                 int ret;
 785
 786 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
 787                 /*
 788                  * We would block on opening a FIFO with no one else on the
 789                  * other end. Do what we used to do and add O_NONBLOCK to the
 790                  * open flags. JRA.
 791                  */
 792
 793                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
 794                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
 795                         local_flags |= O_NONBLOCK;
 796                 }
 797 #endif
 798
 799                 /* Don't create files with Microsoft wildcard characters. */
 800                 if (fsp->base_fsp) {
 801                         /*
 802                          * wildcard characters are allowed in stream names
 803                          * only test the basefilename
 804                          */
 805                         wild = fsp->base_fsp->fsp_name->base_name;
 806                 } else {
 807                         wild = smb_fname->base_name;
 808                 }
 809                 if ((local_flags & O_CREAT) && !file_existed &&
 810                     ms_has_wild(wild))  {
 811                         return NT_STATUS_OBJECT_NAME_INVALID;
 812                 }
 813
 814                 /* Can we access this file ? */
 815                 if (!fsp->base_fsp) {
 816                         /* Only do this check on non-stream open. */
 817                         if (file_existed) {
 818                                 status = smbd_check_access_rights(conn,
 819                                                 smb_fname,
 820                                                 false,
 821                                                 access_mask);
 822                         } else if (local_flags & O_CREAT){
 823                                 status = check_parent_access(conn,
 824                                                 smb_fname,
 825                                                 SEC_DIR_ADD_FILE);
 826                         } else {
 827                                 /* File didn't exist and no O_CREAT. */
 828                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 829                         }
 830                         if (!NT_STATUS_IS_OK(status)) {
 831                                 DEBUG(10,("open_file: "
 832                                         "%s on file "
 833                                         "%s returned %s\n",
 834                                         file_existed ?
 835                                                 "smbd_check_access_rights" :
 836                                                 "check_parent_access",
 837                                         smb_fname_str_dbg(smb_fname),
 838                                         nt_errstr(status) ));
 839                                 return status;
 840                         }
 841                 }
 842
 843                 /* Actually do the open */
 844                 status = fd_open_atomic(conn, fsp, local_flags,
 845                                 unx_mode, p_file_created);
 846                 if (!NT_STATUS_IS_OK(status)) {
 847                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
 848                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
 849                                  nt_errstr(status),local_flags,flags));
 850                         return status;
 851                 }
 852
 853                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 854                 if (ret == -1) {
 855                         /* If we have an fd, this stat should succeed. */
 856                         DEBUG(0,("Error doing fstat on open file %s "
 857                                 "(%s)\n",
 858                                 smb_fname_str_dbg(smb_fname),
 859                                 strerror(errno) ));
 860                         status = map_nt_error_from_unix(errno);
 861                         fd_close(fsp);
 862                         return status;
 863                 }
 864
 865                 if (*p_file_created) {
 866                         /* We created this file. */
 867
 868                         bool need_re_stat = false;
 869                         /* Do all inheritance work after we've
 870                            done a successful fstat call and filled
 871                            in the stat struct in fsp->fsp_name. */
 872
 873                         /* Inherit the ACL if required */
 874                         if (lp_inherit_permissions(SNUM(conn))) {
 875                                 inherit_access_posix_acl(conn, parent_dir,
 876                                                          smb_fname->base_name,
 877                                                          unx_mode);
 878                                 need_re_stat = true;
 879                         }
 880
 881                         /* Change the owner if required. */
 882                         if (lp_inherit_owner(SNUM(conn))) {
 883                                 change_file_owner_to_parent(conn, parent_dir,
 884                                                             fsp);
 885                                 need_re_stat = true;
 886                         }
 887
 888                         if (need_re_stat) {
 889                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 890                                 /* If we have an fd, this stat should succeed. */
 891                                 if (ret == -1) {
 892                                         DEBUG(0,("Error doing fstat on open file %s "
 893                                                  "(%s)\n",
 894                                                  smb_fname_str_dbg(smb_fname),
 895                                                  strerror(errno) ));
 896                                 }
 897                         }
 898
 899                         notify_fname(conn, NOTIFY_ACTION_ADDED,
 900                                      FILE_NOTIFY_CHANGE_FILE_NAME,
 901                                      smb_fname->base_name);
 902                 }
 903         } else {
 904                 fsp->fh->fd = -1; /* What we used to call a stat open. */
 905                 if (!file_existed) {
 906                         /* File must exist for a stat open. */
 907                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 908                 }
 909
 910                 status = smbd_check_access_rights(conn,
 911                                 smb_fname,
 912                                 false,
 913                                 access_mask);
 914
 915                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 916                                 fsp->posix_open &&
 917                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
 918                         /* This is a POSIX stat open for delete
 919                          * or rename on a symlink that points
 920                          * nowhere. Allow. */
 921                         DEBUG(10,("open_file: allowing POSIX "
 922                                   "open on bad symlink %s\n",
 923                                   smb_fname_str_dbg(smb_fname)));
 924                         status = NT_STATUS_OK;
 925                 }
 926
 927                 if (!NT_STATUS_IS_OK(status)) {
 928                         DEBUG(10,("open_file: "
 929                                 "smbd_check_access_rights on file "
 930                                 "%s returned %s\n",
 931                                 smb_fname_str_dbg(smb_fname),
 932                                 nt_errstr(status) ));
 933                         return status;
 934                 }
 935         }
 936
 937         /*
 938          * POSIX allows read-only opens of directories. We don't
 939          * want to do this (we use a different code path for this)
 940          * so catch a directory open and return an EISDIR. JRA.
 941          */
 942
 943         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
 944                 fd_close(fsp);
 945                 errno = EISDIR;
 946                 return NT_STATUS_FILE_IS_A_DIRECTORY;
 947         }
 948
 949         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 950         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
 951         fsp->file_pid = req ? req->smbpid : 0;
 952         fsp->can_lock = True;
 953         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
 954         fsp->can_write =
 955                 CAN_WRITE(conn) &&
 956                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
 957         fsp->print_file = NULL;
 958         fsp->modified = False;
 959         fsp->sent_oplock_break = NO_BREAK_SENT;
 960         fsp->is_directory = False;
 961         if (conn->aio_write_behind_list &&
 962             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
 963                        conn->case_sensitive)) {
 964                 fsp->aio_write_behind = True;
 965         }
 966
 967         fsp->wcp = NULL; /* Write cache pointer. */
 968
 969         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
 970                  conn->session_info->unix_info->unix_name,
 971                  smb_fname_str_dbg(smb_fname),
 972                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
 973                  conn->num_files_open));
 974
 975         errno = 0;
 976         return NT_STATUS_OK;
 977 }
 978
 979 /****************************************************************************
 980  Check if we can open a file with a share mode.
 981  Returns True if conflict, False if not.
 982 ****************************************************************************/
 983
 984 static bool share_conflict(struct share_mode_entry *entry,
 985                            uint32 access_mask,
 986                            uint32 share_access)
 987 {
 988         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
 989                   "entry->share_access = 0x%x, "
 990                   "entry->private_options = 0x%x\n",
 991                   (unsigned int)entry->access_mask,
 992                   (unsigned int)entry->share_access,
 993                   (unsigned int)entry->private_options));
 994
 995         if (server_id_is_disconnected(&entry->pid)) {
 996                 /*
 997                  * note: cleanup should have been done by
 998                  * delay_for_batch_oplocks()
 999                  */
1000                 return false;
1001         }
1002
1003         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
1004                   (unsigned int)access_mask, (unsigned int)share_access));
1005
1006         if ((entry->access_mask & (FILE_WRITE_DATA|
1007                                    FILE_APPEND_DATA|
1008                                    FILE_READ_DATA|
1009                                    FILE_EXECUTE|
1010                                    DELETE_ACCESS)) == 0) {
1011                 DEBUG(10,("share_conflict: No conflict due to "
1012                           "entry->access_mask = 0x%x\n",
1013                           (unsigned int)entry->access_mask ));
1014                 return False;
1015         }
1016
1017         if ((access_mask & (FILE_WRITE_DATA|
1018                             FILE_APPEND_DATA|
1019                             FILE_READ_DATA|
1020                             FILE_EXECUTE|
1021                             DELETE_ACCESS)) == 0) {
1022                 DEBUG(10,("share_conflict: No conflict due to "
1023                           "access_mask = 0x%x\n",
1024                           (unsigned int)access_mask ));
1025                 return False;
1026         }
1027
1028 #if 1 /* JRA TEST - Superdebug. */
1029 #define CHECK_MASK(num, am, right, sa, share) \
1030         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
1031                 (unsigned int)(num), (unsigned int)(am), \
1032                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
1033         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
1034                 (unsigned int)(num), (unsigned int)(sa), \
1035                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
1036         if (((am) & (right)) && !((sa) & (share))) { \
1037                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1038 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1039                         (unsigned int)(share) )); \
1040                 return True; \
1041         }
1042 #else
1043 #define CHECK_MASK(num, am, right, sa, share) \
1044         if (((am) & (right)) && !((sa) & (share))) { \
1045                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1046 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1047                         (unsigned int)(share) )); \
1048                 return True; \
1049         }
1050 #endif
1051
1052         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1053                    share_access, FILE_SHARE_WRITE);
1054         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1055                    entry->share_access, FILE_SHARE_WRITE);
1056
1057         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1058                    share_access, FILE_SHARE_READ);
1059         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1060                    entry->share_access, FILE_SHARE_READ);
1061
1062         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1063                    share_access, FILE_SHARE_DELETE);
1064         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1065                    entry->share_access, FILE_SHARE_DELETE);
1066
1067         DEBUG(10,("share_conflict: No conflict.\n"));
1068         return False;
1069 }
1070
1071 #if defined(DEVELOPER)
1072 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1073                                       int num,
1074                                       struct share_mode_entry *share_entry)
1075 {
1076         struct server_id self = messaging_server_id(sconn->msg_ctx);
1077         files_struct *fsp;
1078
1079         if (!serverid_equal(&self, &share_entry->pid)) {
1080                 return;
1081         }
1082
1083         if (!is_valid_share_mode_entry(share_entry)) {
1084                 return;
1085         }
1086
1087         fsp = file_find_dif(sconn, share_entry->id,
1088                             share_entry->share_file_id);
1089         if (!fsp) {
1090                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1091                          share_mode_str(talloc_tos(), num, share_entry) ));
1092                 smb_panic("validate_my_share_entries: Cannot match a "
1093                           "share entry with an open file\n");
1094         }
1095
1096         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1097                 goto panic;
1098         }
1099
1100         return;
1101
1102  panic:
1103         {
1104                 char *str;
1105                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1106                          share_mode_str(talloc_tos(), num, share_entry) ));
1107                 str = talloc_asprintf(talloc_tos(),
1108                         "validate_my_share_entries: "
1109                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1110                          fsp->fsp_name->base_name,
1111                          (unsigned int)fsp->oplock_type,
1112                          (unsigned int)share_entry->op_type );
1113                 smb_panic(str);
1114         }
1115 }
1116 #endif
1117
1118 bool is_stat_open(uint32 access_mask)
1119 {
1120         const uint32_t stat_open_bits =
1121                 (SYNCHRONIZE_ACCESS|
1122                  FILE_READ_ATTRIBUTES|
1123                  FILE_WRITE_ATTRIBUTES);
1124
1125         return (((access_mask &  stat_open_bits) != 0) &&
1126                 ((access_mask & ~stat_open_bits) == 0));
1127 }
1128
1129 static bool has_delete_on_close(struct share_mode_lock *lck,
1130                                 uint32_t name_hash)
1131 {
1132         struct share_mode_data *d = lck->data;
1133         uint32_t i;
1134
1135         if (d->num_share_modes == 0) {
1136                 return false;
1137         }
1138         if (!is_delete_on_close_set(lck, name_hash)) {
1139                 return false;
1140         }
1141         for (i=0; i<d->num_share_modes; i++) {
1142                 if (!share_mode_stale_pid(d, i)) {
1143                         return true;
1144                 }
1145         }
1146         return false;
1147 }
1148
1149 /****************************************************************************
1150  Deal with share modes
1151  Invarient: Share mode must be locked on entry and exit.
1152  Returns -1 on error, or number of share modes on success (may be zero).
1153 ****************************************************************************/
1154
1155 static NTSTATUS open_mode_check(connection_struct *conn,
1156                                 struct share_mode_lock *lck,
1157                                 uint32 access_mask,
1158                                 uint32 share_access)
1159 {
1160         int i;
1161
1162         if(lck->data->num_share_modes == 0) {
1163                 return NT_STATUS_OK;
1164         }
1165
1166         if (is_stat_open(access_mask)) {
1167                 /* Stat open that doesn't trigger oplock breaks or share mode
1168                  * checks... ! JRA. */
1169                 return NT_STATUS_OK;
1170         }
1171
1172         /*
1173          * Check if the share modes will give us access.
1174          */
1175
1176 #if defined(DEVELOPER)
1177         for(i = 0; i < lck->data->num_share_modes; i++) {
1178                 validate_my_share_entries(conn->sconn, i,
1179                                           &lck->data->share_modes[i]);
1180         }
1181 #endif
1182
1183         /* Now we check the share modes, after any oplock breaks. */
1184         for(i = 0; i < lck->data->num_share_modes; i++) {
1185
1186                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1187                         continue;
1188                 }
1189
1190                 /* someone else has a share lock on it, check to see if we can
1191                  * too */
1192                 if (share_conflict(&lck->data->share_modes[i],
1193                                    access_mask, share_access)) {
1194
1195                         if (share_mode_stale_pid(lck->data, i)) {
1196                                 continue;
1197                         }
1198
1199                         return NT_STATUS_SHARING_VIOLATION;
1200                 }
1201         }
1202
1203         return NT_STATUS_OK;
1204 }
1205
1206 /*
1207  * Send a break message to the oplock holder and delay the open for
1208  * our client.
1209  */
1210
1211 static NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1212                                    const struct share_mode_entry *exclusive,
1213                                    uint16_t break_to)
1214 {
1215         NTSTATUS status;
1216         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1217
1218         DEBUG(10, ("Sending break request to PID %s\n",
1219                    procid_str_static(&exclusive->pid)));
1220
1221         /* Create the message. */
1222         share_mode_entry_to_message(msg, exclusive);
1223
1224         /* Overload entry->op_type */
1225         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1226
1227         status = messaging_send_buf(msg_ctx, exclusive->pid,
1228                                     MSG_SMB_BREAK_REQUEST,
1229                                     (uint8 *)msg, sizeof(msg));
1230         if (!NT_STATUS_IS_OK(status)) {
1231                 DEBUG(3, ("Could not send oplock break message: %s\n",
1232                           nt_errstr(status)));
1233         }
1234
1235         return status;
1236 }
1237
1238 /*
1239  * Do internal consistency checks on the share mode for a file.
1240  */
1241
1242 static bool validate_oplock_types(struct share_mode_lock *lck)
1243 {
1244         struct share_mode_data *d = lck->data;
1245         bool batch = false;
1246         bool ex_or_batch = false;
1247         bool level2 = false;
1248         bool no_oplock = false;
1249         uint32_t num_non_stat_opens = 0;
1250         uint32_t i;
1251
1252         for (i=0; i<d->num_share_modes; i++) {
1253                 struct share_mode_entry *e = &d->share_modes[i];
1254
1255                 if (!is_valid_share_mode_entry(e)) {
1256                         continue;
1257                 }
1258
1259                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1260                         /* We ignore stat opens in the table - they
1261                            always have NO_OPLOCK and never get or
1262                            cause breaks. JRA. */
1263                         continue;
1264                 }
1265
1266                 num_non_stat_opens += 1;
1267
1268                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1269                         /* batch - can only be one. */
1270                         if (share_mode_stale_pid(d, i)) {
1271                                 DEBUG(10, ("Found stale batch oplock\n"));
1272                                 continue;
1273                         }
1274                         if (ex_or_batch || batch || level2 || no_oplock) {
1275                                 DEBUG(0, ("Bad batch oplock entry %u.",
1276                                           (unsigned)i));
1277                                 return false;
1278                         }
1279                         batch = true;
1280                 }
1281
1282                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1283                         if (share_mode_stale_pid(d, i)) {
1284                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1285                                 continue;
1286                         }
1287                         /* Exclusive or batch - can only be one. */
1288                         if (ex_or_batch || level2 || no_oplock) {
1289                                 DEBUG(0, ("Bad exclusive or batch oplock "
1290                                           "entry %u.", (unsigned)i));
1291                                 return false;
1292                         }
1293                         ex_or_batch = true;
1294                 }
1295
1296                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1297                         if (batch || ex_or_batch) {
1298                                 if (share_mode_stale_pid(d, i)) {
1299                                         DEBUG(10, ("Found stale LevelII "
1300                                                    "oplock\n"));
1301                                         continue;
1302                                 }
1303                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1304                                           (unsigned)i));
1305                                 return false;
1306                         }
1307                         level2 = true;
1308                 }
1309
1310                 if (e->op_type == NO_OPLOCK) {
1311                         if (batch || ex_or_batch) {
1312                                 if (share_mode_stale_pid(d, i)) {
1313                                         DEBUG(10, ("Found stale NO_OPLOCK "
1314                                                    "entry\n"));
1315                                         continue;
1316                                 }
1317                                 DEBUG(0, ("Bad no oplock entry %u.",
1318                                           (unsigned)i));
1319                                 return false;
1320                         }
1321                         no_oplock = true;
1322                 }
1323         }
1324
1325         remove_stale_share_mode_entries(d);
1326
1327         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1328                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1329                           (int)batch, (int)ex_or_batch,
1330                           (int)d->num_share_modes));
1331                 return false;
1332         }
1333
1334         return true;
1335 }
1336
1337 static bool delay_for_oplock(files_struct *fsp,
1338                              int oplock_request,
1339                              struct share_mode_lock *lck,
1340                              bool have_sharing_violation,
1341                              uint32_t create_disposition)
1342 {
1343         struct share_mode_data *d = lck->data;
1344         struct share_mode_entry *entry;
1345         uint32_t num_non_stat_opens = 0;
1346         uint32_t i;
1347         uint16_t break_to;
1348
1349         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1350                 return false;
1351         }
1352         for (i=0; i<d->num_share_modes; i++) {
1353                 struct share_mode_entry *e = &d->share_modes[i];
1354                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1355                         continue;
1356                 }
1357                 num_non_stat_opens += 1;
1358
1359                 /*
1360                  * We found the a non-stat open, which in the exclusive/batch
1361                  * case will be inspected further down.
1362                  */
1363                 entry = e;
1364         }
1365         if (num_non_stat_opens == 0) {
1366                 /*
1367                  * Nothing to wait for around
1368                  */
1369                 return false;
1370         }
1371         if (num_non_stat_opens != 1) {
1372                 /*
1373                  * More than one open around. There can't be any exclusive or
1374                  * batch left, this is all level2.
1375                  */
1376                 return false;
1377         }
1378
1379         if (server_id_is_disconnected(&entry->pid)) {
1380                 /*
1381                  * TODO: clean up.
1382                  * This could be achieved by sending a break message
1383                  * to ourselves. Special considerations for files
1384                  * with delete_on_close flag set!
1385                  *
1386                  * For now we keep it simple and do not
1387                  * allow delete on close for durable handles.
1388                  */
1389                 return false;
1390         }
1391
1392         switch (create_disposition) {
1393         case FILE_SUPERSEDE:
1394         case FILE_OVERWRITE_IF:
1395                 break_to = NO_OPLOCK;
1396                 break;
1397         default:
1398                 break_to = LEVEL_II_OPLOCK;
1399                 break;
1400         }
1401
1402         if (have_sharing_violation && (entry->op_type & BATCH_OPLOCK)) {
1403                 if (share_mode_stale_pid(d, 0)) {
1404                         return false;
1405                 }
1406                 send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1407                 return true;
1408         }
1409         if (have_sharing_violation) {
1410                 /*
1411                  * Non-batch exclusive is not broken if we have a sharing
1412                  * violation
1413                  */
1414                 return false;
1415         }
1416         if (LEVEL_II_OPLOCK_TYPE(entry->op_type) &&
1417             (break_to == NO_OPLOCK)) {
1418                 if (share_mode_stale_pid(d, 0)) {
1419                         return false;
1420                 }
1421                 DEBUG(10, ("Asynchronously breaking level2 oplock for "
1422                            "create_disposition=%u\n",
1423                            (unsigned)create_disposition));
1424                 send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1425                 return false;
1426         }
1427         if (!EXCLUSIVE_OPLOCK_TYPE(entry->op_type)) {
1428                 /*
1429                  * No break for NO_OPLOCK or LEVEL2_OPLOCK oplocks
1430                  */
1431                 return false;
1432         }
1433         if (share_mode_stale_pid(d, 0)) {
1434                 return false;
1435         }
1436
1437         send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1438         return true;
1439 }
1440
1441 static bool file_has_brlocks(files_struct *fsp)
1442 {
1443         struct byte_range_lock *br_lck;
1444
1445         br_lck = brl_get_locks_readonly(fsp);
1446         if (!br_lck)
1447                 return false;
1448
1449         return (brl_num_locks(br_lck) > 0);
1450 }
1451
1452 static void grant_fsp_oplock_type(files_struct *fsp,
1453                                   struct share_mode_lock *lck,
1454                                   int oplock_request)
1455 {
1456         bool allow_level2 = (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1457                             lp_level2_oplocks(SNUM(fsp->conn));
1458         bool got_level2_oplock, got_a_none_oplock;
1459         uint32_t i;
1460
1461         /* Start by granting what the client asked for,
1462            but ensure no SAMBA_PRIVATE bits can be set. */
1463         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1464
1465         if (oplock_request & INTERNAL_OPEN_ONLY) {
1466                 /* No oplocks on internal open. */
1467                 fsp->oplock_type = NO_OPLOCK;
1468                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1469                         fsp->oplock_type, fsp_str_dbg(fsp)));
1470                 return;
1471         }
1472
1473         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1474                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1475                         fsp_str_dbg(fsp)));
1476                 fsp->oplock_type = NO_OPLOCK;
1477         }
1478
1479         if (is_stat_open(fsp->access_mask)) {
1480                 /* Leave the value already set. */
1481                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1482                         fsp->oplock_type, fsp_str_dbg(fsp)));
1483                 return;
1484         }
1485
1486         got_level2_oplock = false;
1487         got_a_none_oplock = false;
1488
1489         for (i=0; i<lck->data->num_share_modes; i++) {
1490                 int op_type = lck->data->share_modes[i].op_type;
1491
1492                 if (LEVEL_II_OPLOCK_TYPE(op_type)) {
1493                         got_level2_oplock = true;
1494                 }
1495                 if (op_type == NO_OPLOCK) {
1496                         got_a_none_oplock = true;
1497                 }
1498         }
1499
1500         /*
1501          * Match what was requested (fsp->oplock_type) with
1502          * what was found in the existing share modes.
1503          */
1504
1505         if (got_level2_oplock || got_a_none_oplock) {
1506                 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
1507                         fsp->oplock_type = LEVEL_II_OPLOCK;
1508                 }
1509         }
1510
1511         /*
1512          * Don't grant level2 to clients that don't want them
1513          * or if we've turned them off.
1514          */
1515         if (fsp->oplock_type == LEVEL_II_OPLOCK && !allow_level2) {
1516                 fsp->oplock_type = NO_OPLOCK;
1517         }
1518
1519         if (fsp->oplock_type == LEVEL_II_OPLOCK && !got_level2_oplock) {
1520                 /*
1521                  * We're the first level2 oplock. Indicate that in brlock.tdb.
1522                  */
1523                 struct byte_range_lock *brl;
1524
1525                 brl = brl_get_locks(talloc_tos(), fsp);
1526                 if (brl != NULL) {
1527                         brl_set_have_read_oplocks(brl, true);
1528                         TALLOC_FREE(brl);
1529                 }
1530         }
1531
1532         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1533                   fsp->oplock_type, fsp_str_dbg(fsp)));
1534 }
1535
1536 static bool request_timed_out(struct timeval request_time,
1537                               struct timeval timeout)
1538 {
1539         struct timeval now, end_time;
1540         GetTimeOfDay(&now);
1541         end_time = timeval_sum(&request_time, &timeout);
1542         return (timeval_compare(&end_time, &now) < 0);
1543 }
1544
1545 struct defer_open_state {
1546         struct smbd_server_connection *sconn;
1547         uint64_t mid;
1548 };
1549
1550 static void defer_open_done(struct tevent_req *req);
1551
1552 /****************************************************************************
1553  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1554 ****************************************************************************/
1555
1556 static void defer_open(struct share_mode_lock *lck,
1557                        struct timeval request_time,
1558                        struct timeval timeout,
1559                        struct smb_request *req,
1560                        struct deferred_open_record *state)
1561 {
1562         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1563                   "open entry for mid %llu\n",
1564                   (unsigned int)request_time.tv_sec,
1565                   (unsigned int)request_time.tv_usec,
1566                   (unsigned long long)req->mid));
1567
1568         if (!push_deferred_open_message_smb(req, request_time, timeout,
1569                                        state->id, (char *)state, sizeof(*state))) {
1570                 TALLOC_FREE(lck);
1571                 exit_server("push_deferred_open_message_smb failed");
1572         }
1573         if (lck) {
1574                 struct defer_open_state *watch_state;
1575                 struct tevent_req *watch_req;
1576                 bool ret;
1577
1578                 watch_state = talloc(req->sconn, struct defer_open_state);
1579                 if (watch_state == NULL) {
1580                         exit_server("talloc failed");
1581                 }
1582                 watch_state->sconn = req->sconn;
1583                 watch_state->mid = req->mid;
1584
1585                 DEBUG(10, ("defering mid %llu\n",
1586                            (unsigned long long)req->mid));
1587
1588                 watch_req = dbwrap_record_watch_send(
1589                         watch_state, req->sconn->ev_ctx, lck->data->record,
1590                         req->sconn->msg_ctx);
1591                 if (watch_req == NULL) {
1592                         exit_server("Could not watch share mode record");
1593                 }
1594                 tevent_req_set_callback(watch_req, defer_open_done,
1595                                         watch_state);
1596
1597                 ret = tevent_req_set_endtime(
1598                         watch_req, req->sconn->ev_ctx,
1599                         timeval_sum(&request_time, &timeout));
1600                 SMB_ASSERT(ret);
1601         }
1602 }
1603
1604 static void defer_open_done(struct tevent_req *req)
1605 {
1606         struct defer_open_state *state = tevent_req_callback_data(
1607                 req, struct defer_open_state);
1608         NTSTATUS status;
1609         bool ret;
1610
1611         status = dbwrap_record_watch_recv(req, talloc_tos(), NULL);
1612         TALLOC_FREE(req);
1613         if (!NT_STATUS_IS_OK(status)) {
1614                 DEBUG(5, ("dbwrap_record_watch_recv returned %s\n",
1615                           nt_errstr(status)));
1616                 /*
1617                  * Even if it failed, retry anyway. TODO: We need a way to
1618                  * tell a re-scheduled open about that error.
1619                  */
1620         }
1621
1622         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
1623
1624         ret = schedule_deferred_open_message_smb(state->sconn, state->mid);
1625         SMB_ASSERT(ret);
1626         TALLOC_FREE(state);
1627 }
1628
1629
1630 /****************************************************************************
1631  On overwrite open ensure that the attributes match.
1632 ****************************************************************************/
1633
1634 static bool open_match_attributes(connection_struct *conn,
1635                                   uint32 old_dos_attr,
1636                                   uint32 new_dos_attr,
1637                                   mode_t existing_unx_mode,
1638                                   mode_t new_unx_mode,
1639                                   mode_t *returned_unx_mode)
1640 {
1641         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1642
1643         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1644         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1645
1646         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
1647            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
1648                 *returned_unx_mode = new_unx_mode;
1649         } else {
1650                 *returned_unx_mode = (mode_t)0;
1651         }
1652
1653         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
1654                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
1655                   "returned_unx_mode = 0%o\n",
1656                   (unsigned int)old_dos_attr,
1657                   (unsigned int)existing_unx_mode,
1658                   (unsigned int)new_dos_attr,
1659                   (unsigned int)*returned_unx_mode ));
1660
1661         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
1662         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1663                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
1664                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
1665                         return False;
1666                 }
1667         }
1668         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1669                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
1670                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
1671                         return False;
1672                 }
1673         }
1674         return True;
1675 }
1676
1677 /****************************************************************************
1678  Special FCB or DOS processing in the case of a sharing violation.
1679  Try and find a duplicated file handle.
1680 ****************************************************************************/
1681
1682 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
1683                                 connection_struct *conn,
1684                                 files_struct *fsp_to_dup_into,
1685                                 const struct smb_filename *smb_fname,
1686                                 struct file_id id,
1687                                 uint16 file_pid,
1688                                 uint64_t vuid,
1689                                 uint32 access_mask,
1690                                 uint32 share_access,
1691                                 uint32 create_options)
1692 {
1693         files_struct *fsp;
1694
1695         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
1696                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
1697
1698         for(fsp = file_find_di_first(conn->sconn, id); fsp;
1699             fsp = file_find_di_next(fsp)) {
1700
1701                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
1702                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
1703                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
1704                           fsp->fh->fd, (unsigned long long)fsp->vuid,
1705                           (unsigned int)fsp->file_pid,
1706                           (unsigned int)fsp->fh->private_options,
1707                           (unsigned int)fsp->access_mask ));
1708
1709                 if (fsp != fsp_to_dup_into &&
1710                     fsp->fh->fd != -1 &&
1711                     fsp->vuid == vuid &&
1712                     fsp->file_pid == file_pid &&
1713                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
1714                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
1715                     (fsp->access_mask & FILE_WRITE_DATA) &&
1716                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
1717                     strequal(fsp->fsp_name->stream_name,
1718                              smb_fname->stream_name)) {
1719                         DEBUG(10,("fcb_or_dos_open: file match\n"));
1720                         break;
1721                 }
1722         }
1723
1724         if (!fsp) {
1725                 return NT_STATUS_NOT_FOUND;
1726         }
1727
1728         /* quite an insane set of semantics ... */
1729         if (is_executable(smb_fname->base_name) &&
1730             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
1731                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
1732                 return NT_STATUS_INVALID_PARAMETER;
1733         }
1734
1735         /* We need to duplicate this fsp. */
1736         return dup_file_fsp(req, fsp, access_mask, share_access,
1737                             create_options, fsp_to_dup_into);
1738 }
1739
1740 static void schedule_defer_open(struct share_mode_lock *lck,
1741                                 struct file_id id,
1742                                 struct timeval request_time,
1743                                 struct smb_request *req)
1744 {
1745         struct deferred_open_record state;
1746
1747         /* This is a relative time, added to the absolute
1748            request_time value to get the absolute timeout time.
1749            Note that if this is the second or greater time we enter
1750            this codepath for this particular request mid then
1751            request_time is left as the absolute time of the *first*
1752            time this request mid was processed. This is what allows
1753            the request to eventually time out. */
1754
1755         struct timeval timeout;
1756
1757         /* Normally the smbd we asked should respond within
1758          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
1759          * the client did, give twice the timeout as a safety
1760          * measure here in case the other smbd is stuck
1761          * somewhere else. */
1762
1763         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
1764
1765         /* Nothing actually uses state.delayed_for_oplocks
1766            but it's handy to differentiate in debug messages
1767            between a 30 second delay due to oplock break, and
1768            a 1 second delay for share mode conflicts. */
1769
1770         state.delayed_for_oplocks = True;
1771         state.async_open = false;
1772         state.id = id;
1773
1774         if (!request_timed_out(request_time, timeout)) {
1775                 defer_open(lck, request_time, timeout, req, &state);
1776         }
1777 }
1778
1779 /****************************************************************************
1780  Reschedule an open call that went asynchronous.
1781 ****************************************************************************/
1782
1783 static void schedule_async_open(struct timeval request_time,
1784                                 struct smb_request *req)
1785 {
1786         struct deferred_open_record state;
1787         struct timeval timeout;
1788
1789         timeout = timeval_set(20, 0);
1790
1791         ZERO_STRUCT(state);
1792         state.delayed_for_oplocks = false;
1793         state.async_open = true;
1794
1795         if (!request_timed_out(request_time, timeout)) {
1796                 defer_open(NULL, request_time, timeout, req, &state);
1797         }
1798 }
1799
1800 /****************************************************************************
1801  Work out what access_mask to use from what the client sent us.
1802 ****************************************************************************/
1803
1804 static NTSTATUS smbd_calculate_maximum_allowed_access(
1805         connection_struct *conn,
1806         const struct smb_filename *smb_fname,
1807         bool use_privs,
1808         uint32_t *p_access_mask)
1809 {
1810         struct security_descriptor *sd;
1811         uint32_t access_granted;
1812         NTSTATUS status;
1813
1814         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
1815                 *p_access_mask |= FILE_GENERIC_ALL;
1816                 return NT_STATUS_OK;
1817         }
1818
1819         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
1820                                     (SECINFO_OWNER |
1821                                      SECINFO_GROUP |
1822                                      SECINFO_DACL),
1823                                     talloc_tos(), &sd);
1824
1825         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1826                 /*
1827                  * File did not exist
1828                  */
1829                 *p_access_mask = FILE_GENERIC_ALL;
1830                 return NT_STATUS_OK;
1831         }
1832         if (!NT_STATUS_IS_OK(status)) {
1833                 DEBUG(10,("Could not get acl on file %s: %s\n",
1834                           smb_fname_str_dbg(smb_fname),
1835                           nt_errstr(status)));
1836                 return NT_STATUS_ACCESS_DENIED;
1837         }
1838
1839         /*
1840          * If we can access the path to this file, by
1841          * default we have FILE_READ_ATTRIBUTES from the
1842          * containing directory. See the section:
1843          * "Algorithm to Check Access to an Existing File"
1844          * in MS-FSA.pdf.
1845          *
1846          * se_file_access_check()
1847          * also takes care of owner WRITE_DAC and READ_CONTROL.
1848          */
1849         status = se_file_access_check(sd,
1850                                  get_current_nttok(conn),
1851                                  use_privs,
1852                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
1853                                  &access_granted);
1854
1855         TALLOC_FREE(sd);
1856
1857         if (!NT_STATUS_IS_OK(status)) {
1858                 DEBUG(10, ("Access denied on file %s: "
1859                            "when calculating maximum access\n",
1860                            smb_fname_str_dbg(smb_fname)));
1861                 return NT_STATUS_ACCESS_DENIED;
1862         }
1863         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
1864
1865         if (!(access_granted & DELETE_ACCESS)) {
1866                 if (can_delete_file_in_directory(conn, smb_fname)) {
1867                         *p_access_mask |= DELETE_ACCESS;
1868                 }
1869         }
1870
1871         return NT_STATUS_OK;
1872 }
1873
1874 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
1875                                     const struct smb_filename *smb_fname,
1876                                     bool use_privs,
1877                                     uint32_t access_mask,
1878                                     uint32_t *access_mask_out)
1879 {
1880         NTSTATUS status;
1881         uint32_t orig_access_mask = access_mask;
1882         uint32_t rejected_share_access;
1883
1884         /*
1885          * Convert GENERIC bits to specific bits.
1886          */
1887
1888         se_map_generic(&access_mask, &file_generic_mapping);
1889
1890         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
1891         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
1892
1893                 status = smbd_calculate_maximum_allowed_access(
1894                         conn, smb_fname, use_privs, &access_mask);
1895
1896                 if (!NT_STATUS_IS_OK(status)) {
1897                         return status;
1898                 }
1899
1900                 access_mask &= conn->share_access;
1901         }
1902
1903         rejected_share_access = access_mask & ~(conn->share_access);
1904
1905         if (rejected_share_access) {
1906                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
1907                         "file %s: rejected by share access mask[0x%08X] "
1908                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
1909                         smb_fname_str_dbg(smb_fname),
1910                         conn->share_access,
1911                         orig_access_mask, access_mask,
1912                         rejected_share_access));
1913                 return NT_STATUS_ACCESS_DENIED;
1914         }
1915
1916         *access_mask_out = access_mask;
1917         return NT_STATUS_OK;
1918 }
1919
1920 /****************************************************************************
1921  Remove the deferred open entry under lock.
1922 ****************************************************************************/
1923
1924 /****************************************************************************
1925  Return true if this is a state pointer to an asynchronous create.
1926 ****************************************************************************/
1927
1928 bool is_deferred_open_async(const void *ptr)
1929 {
1930         const struct deferred_open_record *state = (const struct deferred_open_record *)ptr;
1931
1932         return state->async_open;
1933 }
1934
1935 static bool clear_ads(uint32_t create_disposition)
1936 {
1937         bool ret = false;
1938
1939         switch (create_disposition) {
1940         case FILE_SUPERSEDE:
1941         case FILE_OVERWRITE_IF:
1942         case FILE_OVERWRITE:
1943                 ret = true;
1944                 break;
1945         default:
1946                 break;
1947         }
1948         return ret;
1949 }
1950
1951 static int disposition_to_open_flags(uint32_t create_disposition)
1952 {
1953         int ret = 0;
1954
1955         /*
1956          * Currently we're using FILE_SUPERSEDE as the same as
1957          * FILE_OVERWRITE_IF but they really are
1958          * different. FILE_SUPERSEDE deletes an existing file
1959          * (requiring delete access) then recreates it.
1960          */
1961
1962         switch (create_disposition) {
1963         case FILE_SUPERSEDE:
1964         case FILE_OVERWRITE_IF:
1965                 /*
1966                  * If file exists replace/overwrite. If file doesn't
1967                  * exist create.
1968                  */
1969                 ret = O_CREAT|O_TRUNC;
1970                 break;
1971
1972         case FILE_OPEN:
1973                 /*
1974                  * If file exists open. If file doesn't exist error.
1975                  */
1976                 ret = 0;
1977                 break;
1978
1979         case FILE_OVERWRITE:
1980                 /*
1981                  * If file exists overwrite. If file doesn't exist
1982                  * error.
1983                  */
1984                 ret = O_TRUNC;
1985                 break;
1986
1987         case FILE_CREATE:
1988                 /*
1989                  * If file exists error. If file doesn't exist create.
1990                  */
1991                 ret = O_CREAT|O_EXCL;
1992                 break;
1993
1994         case FILE_OPEN_IF:
1995                 /*
1996                  * If file exists open. If file doesn't exist create.
1997                  */
1998                 ret = O_CREAT;
1999                 break;
2000         }
2001         return ret;
2002 }
2003
2004 static int calculate_open_access_flags(uint32_t access_mask,
2005                                        int oplock_request,
2006                                        uint32_t private_flags)
2007 {
2008         bool need_write, need_read;
2009
2010         /*
2011          * Note that we ignore the append flag as append does not
2012          * mean the same thing under DOS and Unix.
2013          */
2014
2015         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
2016         if (!need_write) {
2017                 return O_RDONLY;
2018         }
2019
2020         /* DENY_DOS opens are always underlying read-write on the
2021            file handle, no matter what the requested access mask
2022            says. */
2023
2024         need_read =
2025                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
2026                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
2027                                 FILE_READ_EA|FILE_EXECUTE));
2028
2029         if (!need_read) {
2030                 return O_WRONLY;
2031         }
2032         return O_RDWR;
2033 }
2034
2035 /****************************************************************************
2036  Open a file with a share mode. Passed in an already created files_struct *.
2037 ****************************************************************************/
2038
2039 static NTSTATUS open_file_ntcreate(connection_struct *conn,
2040                             struct smb_request *req,
2041                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
2042                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
2043                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
2044                             uint32 create_options,      /* options such as delete on close. */
2045                             uint32 new_dos_attributes,  /* attributes used for new file. */
2046                             int oplock_request,         /* internal Samba oplock codes. */
2047                                                         /* Information (FILE_EXISTS etc.) */
2048                             uint32_t private_flags,     /* Samba specific flags. */
2049                             int *pinfo,
2050                             files_struct *fsp)
2051 {
2052         struct smb_filename *smb_fname = fsp->fsp_name;
2053         int flags=0;
2054         int flags2=0;
2055         bool file_existed = VALID_STAT(smb_fname->st);
2056         bool def_acl = False;
2057         bool posix_open = False;
2058         bool new_file_created = False;
2059         bool first_open_attempt = true;
2060         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
2061         mode_t new_unx_mode = (mode_t)0;
2062         mode_t unx_mode = (mode_t)0;
2063         int info;
2064         uint32 existing_dos_attributes = 0;
2065         struct timeval request_time = timeval_zero();
2066         struct share_mode_lock *lck = NULL;
2067         uint32 open_access_mask = access_mask;
2068         NTSTATUS status;
2069         char *parent_dir;
2070         SMB_STRUCT_STAT saved_stat = smb_fname->st;
2071         struct timespec old_write_time;
2072         struct file_id id;
2073
2074         if (conn->printer) {
2075                 /*
2076                  * Printers are handled completely differently.
2077                  * Most of the passed parameters are ignored.
2078                  */
2079
2080                 if (pinfo) {
2081                         *pinfo = FILE_WAS_CREATED;
2082                 }
2083
2084                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
2085                            smb_fname_str_dbg(smb_fname)));
2086
2087                 if (!req) {
2088                         DEBUG(0,("open_file_ntcreate: printer open without "
2089                                 "an SMB request!\n"));
2090                         return NT_STATUS_INTERNAL_ERROR;
2091                 }
2092
2093                 return print_spool_open(fsp, smb_fname->base_name,
2094                                         req->vuid);
2095         }
2096
2097         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
2098                             NULL)) {
2099                 return NT_STATUS_NO_MEMORY;
2100         }
2101
2102         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2103                 posix_open = True;
2104                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2105                 new_dos_attributes = 0;
2106         } else {
2107                 /* Windows allows a new file to be created and
2108                    silently removes a FILE_ATTRIBUTE_DIRECTORY
2109                    sent by the client. Do the same. */
2110
2111                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
2112
2113                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
2114                  * created new. */
2115                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2116                                      smb_fname, parent_dir);
2117         }
2118
2119         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
2120                    "access_mask=0x%x share_access=0x%x "
2121                    "create_disposition = 0x%x create_options=0x%x "
2122                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
2123                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
2124                    access_mask, share_access, create_disposition,
2125                    create_options, (unsigned int)unx_mode, oplock_request,
2126                    (unsigned int)private_flags));
2127
2128         if ((req == NULL) && ((oplock_request & INTERNAL_OPEN_ONLY) == 0)) {
2129                 DEBUG(0, ("No smb request but not an internal only open!\n"));
2130                 return NT_STATUS_INTERNAL_ERROR;
2131         }
2132
2133         /*
2134          * Only non-internal opens can be deferred at all
2135          */
2136
2137         if (req) {
2138                 void *ptr;
2139                 if (get_deferred_open_message_state(req,
2140                                 &request_time,
2141                                 &ptr)) {
2142                         /* Remember the absolute time of the original
2143                            request with this mid. We'll use it later to
2144                            see if this has timed out. */
2145
2146                         /* If it was an async create retry, the file
2147                            didn't exist. */
2148
2149                         if (is_deferred_open_async(ptr)) {
2150                                 SET_STAT_INVALID(smb_fname->st);
2151                                 file_existed = false;
2152                         }
2153
2154                         /* Ensure we don't reprocess this message. */
2155                         remove_deferred_open_message_smb(req->sconn, req->mid);
2156
2157                         first_open_attempt = false;
2158                 }
2159         }
2160
2161         if (!posix_open) {
2162                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
2163                 if (file_existed) {
2164                         existing_dos_attributes = dos_mode(conn, smb_fname);
2165                 }
2166         }
2167
2168         /* ignore any oplock requests if oplocks are disabled */
2169         if (!lp_oplocks(SNUM(conn)) ||
2170             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
2171                 /* Mask off everything except the private Samba bits. */
2172                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2173         }
2174
2175         /* this is for OS/2 long file names - say we don't support them */
2176         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2177                 /* OS/2 Workplace shell fix may be main code stream in a later
2178                  * release. */
2179                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2180                          "supported.\n"));
2181                 if (use_nt_status()) {
2182                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2183                 }
2184                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2185         }
2186
2187         switch( create_disposition ) {
2188                 case FILE_OPEN:
2189                         /* If file exists open. If file doesn't exist error. */
2190                         if (!file_existed) {
2191                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2192                                          "requested for file %s and file "
2193                                          "doesn't exist.\n",
2194                                          smb_fname_str_dbg(smb_fname)));
2195                                 errno = ENOENT;
2196                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2197                         }
2198                         break;
2199
2200                 case FILE_OVERWRITE:
2201                         /* If file exists overwrite. If file doesn't exist
2202                          * error. */
2203                         if (!file_existed) {
2204                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2205                                          "requested for file %s and file "
2206                                          "doesn't exist.\n",
2207                                          smb_fname_str_dbg(smb_fname) ));
2208                                 errno = ENOENT;
2209                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2210                         }
2211                         break;
2212
2213                 case FILE_CREATE:
2214                         /* If file exists error. If file doesn't exist
2215                          * create. */
2216                         if (file_existed) {
2217                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2218                                          "requested for file %s and file "
2219                                          "already exists.\n",
2220                                          smb_fname_str_dbg(smb_fname)));
2221                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2222                                         errno = EISDIR;
2223                                 } else {
2224                                         errno = EEXIST;
2225                                 }
2226                                 return map_nt_error_from_unix(errno);
2227                         }
2228                         break;
2229
2230                 case FILE_SUPERSEDE:
2231                 case FILE_OVERWRITE_IF:
2232                 case FILE_OPEN_IF:
2233                         break;
2234                 default:
2235                         return NT_STATUS_INVALID_PARAMETER;
2236         }
2237
2238         flags2 = disposition_to_open_flags(create_disposition);
2239
2240         /* We only care about matching attributes on file exists and
2241          * overwrite. */
2242
2243         if (!posix_open && file_existed &&
2244             ((create_disposition == FILE_OVERWRITE) ||
2245              (create_disposition == FILE_OVERWRITE_IF))) {
2246                 if (!open_match_attributes(conn, existing_dos_attributes,
2247                                            new_dos_attributes,
2248                                            smb_fname->st.st_ex_mode,
2249                                            unx_mode, &new_unx_mode)) {
2250                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2251                                  "for file %s (%x %x) (0%o, 0%o)\n",
2252                                  smb_fname_str_dbg(smb_fname),
2253                                  existing_dos_attributes,
2254                                  new_dos_attributes,
2255                                  (unsigned int)smb_fname->st.st_ex_mode,
2256                                  (unsigned int)unx_mode ));
2257                         errno = EACCES;
2258                         return NT_STATUS_ACCESS_DENIED;
2259                 }
2260         }
2261
2262         status = smbd_calculate_access_mask(conn, smb_fname,
2263                                         false,
2264                                         access_mask,
2265                                         &access_mask);
2266         if (!NT_STATUS_IS_OK(status)) {
2267                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2268                         "on file %s returned %s\n",
2269                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2270                 return status;
2271         }
2272
2273         open_access_mask = access_mask;
2274
2275         if (flags2 & O_TRUNC) {
2276                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2277         }
2278
2279         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2280                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2281                     access_mask));
2282
2283         /*
2284          * Note that we ignore the append flag as append does not
2285          * mean the same thing under DOS and Unix.
2286          */
2287
2288         flags = calculate_open_access_flags(access_mask, oplock_request,
2289                                             private_flags);
2290
2291         /*
2292          * Currently we only look at FILE_WRITE_THROUGH for create options.
2293          */
2294
2295 #if defined(O_SYNC)
2296         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2297                 flags2 |= O_SYNC;
2298         }
2299 #endif /* O_SYNC */
2300
2301         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2302                 flags2 |= O_APPEND;
2303         }
2304
2305         if (!posix_open && !CAN_WRITE(conn)) {
2306                 /*
2307                  * We should really return a permission denied error if either
2308                  * O_CREAT or O_TRUNC are set, but for compatibility with
2309                  * older versions of Samba we just AND them out.
2310                  */
2311                 flags2 &= ~(O_CREAT|O_TRUNC);
2312         }
2313
2314         if (first_open_attempt && lp_kernel_oplocks(SNUM(conn))) {
2315                 /*
2316                  * With kernel oplocks the open breaking an oplock
2317                  * blocks until the oplock holder has given up the
2318                  * oplock or closed the file. We prevent this by first
2319                  * trying to open the file with O_NONBLOCK (see "man
2320                  * fcntl" on Linux). For the second try, triggered by
2321                  * an oplock break response, we do not need this
2322                  * anymore.
2323                  *
2324                  * This is true under the assumption that only Samba
2325                  * requests kernel oplocks. Once someone else like
2326                  * NFSv4 starts to use that API, we will have to
2327                  * modify this by communicating with the NFSv4 server.
2328                  */
2329                 flags2 |= O_NONBLOCK;
2330         }
2331
2332         /*
2333          * Ensure we can't write on a read-only share or file.
2334          */
2335
2336         if (flags != O_RDONLY && file_existed &&
2337             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2338                 DEBUG(5,("open_file_ntcreate: write access requested for "
2339                          "file %s on read only %s\n",
2340                          smb_fname_str_dbg(smb_fname),
2341                          !CAN_WRITE(conn) ? "share" : "file" ));
2342                 errno = EACCES;
2343                 return NT_STATUS_ACCESS_DENIED;
2344         }
2345
2346         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2347         fsp->share_access = share_access;
2348         fsp->fh->private_options = private_flags;
2349         fsp->access_mask = open_access_mask; /* We change this to the
2350                                               * requested access_mask after
2351                                               * the open is done. */
2352         fsp->posix_open = posix_open;
2353
2354         /* Ensure no SAMBA_PRIVATE bits can be set. */
2355         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2356
2357         if (timeval_is_zero(&request_time)) {
2358                 request_time = fsp->open_time;
2359         }
2360
2361         /*
2362          * Ensure we pay attention to default ACLs on directories if required.
2363          */
2364
2365         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2366             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2367                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2368         }
2369
2370         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2371                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2372                  (unsigned int)flags, (unsigned int)flags2,
2373                  (unsigned int)unx_mode, (unsigned int)access_mask,
2374                  (unsigned int)open_access_mask));
2375
2376         fsp_open = open_file(fsp, conn, req, parent_dir,
2377                              flags|flags2, unx_mode, access_mask,
2378                              open_access_mask, &new_file_created);
2379
2380         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
2381                 struct deferred_open_record state;
2382
2383                 /*
2384                  * EWOULDBLOCK/EAGAIN maps to NETWORK_BUSY.
2385                  */
2386                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
2387                         DEBUG(10, ("FIFO busy\n"));
2388                         return NT_STATUS_NETWORK_BUSY;
2389                 }
2390                 if (req == NULL) {
2391                         DEBUG(10, ("Internal open busy\n"));
2392                         return NT_STATUS_NETWORK_BUSY;
2393                 }
2394
2395                 /*
2396                  * From here on we assume this is an oplock break triggered
2397                  */
2398
2399                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
2400                 if (lck == NULL) {
2401                         state.delayed_for_oplocks = false;
2402                         state.async_open = false;
2403                         state.id = fsp->file_id;
2404                         defer_open(NULL, request_time, timeval_set(0, 0),
2405                                    req, &state);
2406                         DEBUG(10, ("No share mode lock found after "
2407                                    "EWOULDBLOCK, retrying sync\n"));
2408                         return NT_STATUS_SHARING_VIOLATION;
2409                 }
2410
2411                 if (!validate_oplock_types(lck)) {
2412                         smb_panic("validate_oplock_types failed");
2413                 }
2414
2415                 if (delay_for_oplock(fsp, 0, lck, false, create_disposition)) {
2416                         schedule_defer_open(lck, fsp->file_id, request_time, req);
2417                         TALLOC_FREE(lck);
2418                         DEBUG(10, ("Sent oplock break request to kernel "
2419                                    "oplock holder\n"));
2420                         return NT_STATUS_SHARING_VIOLATION;
2421                 }
2422
2423                 /*
2424                  * No oplock from Samba around. Immediately retry with
2425                  * a blocking open.
2426                  */
2427                 state.delayed_for_oplocks = false;
2428                 state.async_open = false;
2429                 state.id = lck->data->id;
2430                 defer_open(lck, request_time, timeval_set(0, 0), req, &state);
2431                 TALLOC_FREE(lck);
2432                 DEBUG(10, ("No Samba oplock around after EWOULDBLOCK. "
2433                            "Retrying sync\n"));
2434                 return NT_STATUS_SHARING_VIOLATION;
2435         }
2436
2437         if (!NT_STATUS_IS_OK(fsp_open)) {
2438                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2439                         schedule_async_open(request_time, req);
2440                 }
2441                 return fsp_open;
2442         }
2443
2444         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2445                 /*
2446                  * The file did exist, but some other (local or NFS)
2447                  * process either renamed/unlinked and re-created the
2448                  * file with different dev/ino after we walked the path,
2449                  * but before we did the open. We could retry the
2450                  * open but it's a rare enough case it's easier to
2451                  * just fail the open to prevent creating any problems
2452                  * in the open file db having the wrong dev/ino key.
2453                  */
2454                 fd_close(fsp);
2455                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2456                         "Old (dev=0x%llu, ino =0x%llu). "
2457                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2458                         " with NT_STATUS_ACCESS_DENIED.\n",
2459                          smb_fname_str_dbg(smb_fname),
2460                          (unsigned long long)saved_stat.st_ex_dev,
2461                          (unsigned long long)saved_stat.st_ex_ino,
2462                          (unsigned long long)smb_fname->st.st_ex_dev,
2463                          (unsigned long long)smb_fname->st.st_ex_ino));
2464                 return NT_STATUS_ACCESS_DENIED;
2465         }
2466
2467         old_write_time = smb_fname->st.st_ex_mtime;
2468
2469         /*
2470          * Deal with the race condition where two smbd's detect the
2471          * file doesn't exist and do the create at the same time. One
2472          * of them will win and set a share mode, the other (ie. this
2473          * one) should check if the requested share mode for this
2474          * create is allowed.
2475          */
2476
2477         /*
2478          * Now the file exists and fsp is successfully opened,
2479          * fsp->dev and fsp->inode are valid and should replace the
2480          * dev=0,inode=0 from a non existent file. Spotted by
2481          * Nadav Danieli <nadavd@exanet.com>. JRA.
2482          */
2483
2484         id = fsp->file_id;
2485
2486         lck = get_share_mode_lock(talloc_tos(), id,
2487                                   conn->connectpath,
2488                                   smb_fname, &old_write_time);
2489
2490         if (lck == NULL) {
2491                 DEBUG(0, ("open_file_ntcreate: Could not get share "
2492                           "mode lock for %s\n",
2493                           smb_fname_str_dbg(smb_fname)));
2494                 fd_close(fsp);
2495                 return NT_STATUS_SHARING_VIOLATION;
2496         }
2497
2498         /* Get the types we need to examine. */
2499         if (!validate_oplock_types(lck)) {
2500                 smb_panic("validate_oplock_types failed");
2501         }
2502
2503         if (has_delete_on_close(lck, fsp->name_hash)) {
2504                 TALLOC_FREE(lck);
2505                 fd_close(fsp);
2506                 return NT_STATUS_DELETE_PENDING;
2507         }
2508
2509         status = open_mode_check(conn, lck,
2510                                  access_mask, share_access);
2511
2512         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
2513             (lck->data->num_share_modes > 0)) {
2514                 /*
2515                  * This comes from ancient times out of open_mode_check. I
2516                  * have no clue whether this is still necessary. I can't think
2517                  * of a case where this would actually matter further down in
2518                  * this function. I leave it here for further investigation
2519                  * :-)
2520                  */
2521                 file_existed = true;
2522         }
2523
2524         if ((req != NULL) &&
2525             delay_for_oplock(
2526                     fsp, oplock_request, lck,
2527                     NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION),
2528                     create_disposition)) {
2529                 schedule_defer_open(lck, fsp->file_id, request_time, req);
2530                 TALLOC_FREE(lck);
2531                 fd_close(fsp);
2532                 return NT_STATUS_SHARING_VIOLATION;
2533         }
2534
2535         if (!NT_STATUS_IS_OK(status)) {
2536                 uint32 can_access_mask;
2537                 bool can_access = True;
2538
2539                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2540
2541                 /* Check if this can be done with the deny_dos and fcb
2542                  * calls. */
2543                 if (private_flags &
2544                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2545                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2546                         if (req == NULL) {
2547                                 DEBUG(0, ("DOS open without an SMB "
2548                                           "request!\n"));
2549                                 TALLOC_FREE(lck);
2550                                 fd_close(fsp);
2551                                 return NT_STATUS_INTERNAL_ERROR;
2552                         }
2553
2554                         /* Use the client requested access mask here,
2555                          * not the one we open with. */
2556                         status = fcb_or_dos_open(req,
2557                                                  conn,
2558                                                  fsp,
2559                                                  smb_fname,
2560                                                  id,
2561                                                  req->smbpid,
2562                                                  req->vuid,
2563                                                  access_mask,
2564                                                  share_access,
2565                                                  create_options);
2566
2567                         if (NT_STATUS_IS_OK(status)) {
2568                                 TALLOC_FREE(lck);
2569                                 if (pinfo) {
2570                                         *pinfo = FILE_WAS_OPENED;
2571                                 }
2572                                 return NT_STATUS_OK;
2573                         }
2574                 }
2575
2576                 /*
2577                  * This next line is a subtlety we need for
2578                  * MS-Access. If a file open will fail due to share
2579                  * permissions and also for security (access) reasons,
2580                  * we need to return the access failed error, not the
2581                  * share error. We can't open the file due to kernel
2582                  * oplock deadlock (it's possible we failed above on
2583                  * the open_mode_check()) so use a userspace check.
2584                  */
2585
2586                 if (flags & O_RDWR) {
2587                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2588                 } else if (flags & O_WRONLY) {
2589                         can_access_mask = FILE_WRITE_DATA;
2590                 } else {
2591                         can_access_mask = FILE_READ_DATA;
2592                 }
2593
2594                 if (((can_access_mask & FILE_WRITE_DATA) &&
2595                      !CAN_WRITE(conn)) ||
2596                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2597                                                               smb_fname,
2598                                                               false,
2599                                                               can_access_mask))) {
2600                         can_access = False;
2601                 }
2602
2603                 /*
2604                  * If we're returning a share violation, ensure we
2605                  * cope with the braindead 1 second delay (SMB1 only).
2606                  */
2607
2608                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2609                     !conn->sconn->using_smb2 &&
2610                     lp_defer_sharing_violations()) {
2611                         struct timeval timeout;
2612                         struct deferred_open_record state;
2613                         int timeout_usecs;
2614
2615                         /* this is a hack to speed up torture tests
2616                            in 'make test' */
2617                         timeout_usecs = lp_parm_int(SNUM(conn),
2618                                                     "smbd","sharedelay",
2619                                                     SHARING_VIOLATION_USEC_WAIT);
2620
2621                         /* This is a relative time, added to the absolute
2622                            request_time value to get the absolute timeout time.
2623                            Note that if this is the second or greater time we enter
2624                            this codepath for this particular request mid then
2625                            request_time is left as the absolute time of the *first*
2626                            time this request mid was processed. This is what allows
2627                            the request to eventually time out. */
2628
2629                         timeout = timeval_set(0, timeout_usecs);
2630
2631                         /* Nothing actually uses state.delayed_for_oplocks
2632                            but it's handy to differentiate in debug messages
2633                            between a 30 second delay due to oplock break, and
2634                            a 1 second delay for share mode conflicts. */
2635
2636                         state.delayed_for_oplocks = False;
2637                         state.async_open = false;
2638                         state.id = id;
2639
2640                         if ((req != NULL)
2641                             && !request_timed_out(request_time,
2642                                                   timeout)) {
2643                                 defer_open(lck, request_time, timeout,
2644                                            req, &state);
2645                         }
2646                 }
2647
2648                 TALLOC_FREE(lck);
2649                 fd_close(fsp);
2650                 if (can_access) {
2651                         /*
2652                          * We have detected a sharing violation here
2653                          * so return the correct error code
2654                          */
2655                         status = NT_STATUS_SHARING_VIOLATION;
2656                 } else {
2657                         status = NT_STATUS_ACCESS_DENIED;
2658                 }
2659                 return status;
2660         }
2661
2662         grant_fsp_oplock_type(fsp, lck, oplock_request);
2663
2664         /*
2665          * We have the share entry *locked*.....
2666          */
2667
2668         /* Delete streams if create_disposition requires it */
2669         if (!new_file_created && clear_ads(create_disposition) &&
2670             !is_ntfs_stream_smb_fname(smb_fname)) {
2671                 status = delete_all_streams(conn, smb_fname->base_name);
2672                 if (!NT_STATUS_IS_OK(status)) {
2673                         TALLOC_FREE(lck);
2674                         fd_close(fsp);
2675                         return status;
2676                 }
2677         }
2678
2679         /* note that we ignore failure for the following. It is
2680            basically a hack for NFS, and NFS will never set one of
2681            these only read them. Nobody but Samba can ever set a deny
2682            mode and we have already checked our more authoritative
2683            locking database for permission to set this deny mode. If
2684            the kernel refuses the operations then the kernel is wrong.
2685            note that GPFS supports it as well - jmcd */
2686
2687         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
2688                 int ret_flock;
2689                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
2690                 if(ret_flock == -1 ){
2691
2692                         TALLOC_FREE(lck);
2693                         fd_close(fsp);
2694
2695                         return NT_STATUS_SHARING_VIOLATION;
2696                 }
2697         }
2698
2699         /*
2700          * At this point onwards, we can guarantee that the share entry
2701          * is locked, whether we created the file or not, and that the
2702          * deny mode is compatible with all current opens.
2703          */
2704
2705         /*
2706          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
2707          * but we don't have to store this - just ignore it on access check.
2708          */
2709         if (conn->sconn->using_smb2) {
2710                 /*
2711                  * SMB2 doesn't return it (according to Microsoft tests).
2712                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
2713                  * File created with access = 0x7 (Read, Write, Delete)
2714                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
2715                  */
2716                 fsp->access_mask = access_mask;
2717         } else {
2718                 /* But SMB1 does. */
2719                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
2720         }
2721
2722         if (file_existed) {
2723                 /* stat opens on existing files don't get oplocks. */
2724                 if (is_stat_open(open_access_mask)) {
2725                         fsp->oplock_type = NO_OPLOCK;
2726                 }
2727         }
2728
2729         if (new_file_created) {
2730                 info = FILE_WAS_CREATED;
2731         } else {
2732                 if (flags2 & O_TRUNC) {
2733                         info = FILE_WAS_OVERWRITTEN;
2734                 } else {
2735                         info = FILE_WAS_OPENED;
2736                 }
2737         }
2738
2739         if (pinfo) {
2740                 *pinfo = info;
2741         }
2742
2743         /*
2744          * Setup the oplock info in both the shared memory and
2745          * file structs.
2746          */
2747
2748         status = set_file_oplock(fsp);
2749         if (!NT_STATUS_IS_OK(status)) {
2750                 /*
2751                  * Could not get the kernel oplock
2752                  */
2753                 fsp->oplock_type = NO_OPLOCK;
2754         }
2755
2756         if (!set_share_mode(lck, fsp, get_current_uid(conn),
2757                             req ? req->mid : 0,
2758                             fsp->oplock_type)) {
2759                 TALLOC_FREE(lck);
2760                 fd_close(fsp);
2761                 return NT_STATUS_NO_MEMORY;
2762         }
2763
2764         /* Handle strange delete on close create semantics. */
2765         if (create_options & FILE_DELETE_ON_CLOSE) {
2766
2767                 status = can_set_delete_on_close(fsp, new_dos_attributes);
2768
2769                 if (!NT_STATUS_IS_OK(status)) {
2770                         /* Remember to delete the mode we just added. */
2771                         del_share_mode(lck, fsp);
2772                         TALLOC_FREE(lck);
2773                         fd_close(fsp);
2774                         return status;
2775                 }
2776                 /* Note that here we set the *inital* delete on close flag,
2777                    not the regular one. The magic gets handled in close. */
2778                 fsp->initial_delete_on_close = True;
2779         }
2780
2781         if (info != FILE_WAS_OPENED) {
2782                 /* Files should be initially set as archive */
2783                 if (lp_map_archive(SNUM(conn)) ||
2784                     lp_store_dos_attributes(SNUM(conn))) {
2785                         if (!posix_open) {
2786                                 if (file_set_dosmode(conn, smb_fname,
2787                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2788                                             parent_dir, true) == 0) {
2789                                         unx_mode = smb_fname->st.st_ex_mode;
2790                                 }
2791                         }
2792                 }
2793         }
2794
2795         /* Determine sparse flag. */
2796         if (posix_open) {
2797                 /* POSIX opens are sparse by default. */
2798                 fsp->is_sparse = true;
2799         } else {
2800                 fsp->is_sparse = (file_existed &&
2801                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
2802         }
2803
2804         /*
2805          * Take care of inherited ACLs on created files - if default ACL not
2806          * selected.
2807          */
2808
2809         if (!posix_open && new_file_created && !def_acl) {
2810
2811                 int saved_errno = errno; /* We might get ENOSYS in the next
2812                                           * call.. */
2813
2814                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
2815                     errno == ENOSYS) {
2816                         errno = saved_errno; /* Ignore ENOSYS */
2817                 }
2818
2819         } else if (new_unx_mode) {
2820
2821                 int ret = -1;
2822
2823                 /* Attributes need changing. File already existed. */
2824
2825                 {
2826                         int saved_errno = errno; /* We might get ENOSYS in the
2827                                                   * next call.. */
2828                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
2829
2830                         if (ret == -1 && errno == ENOSYS) {
2831                                 errno = saved_errno; /* Ignore ENOSYS */
2832                         } else {
2833                                 DEBUG(5, ("open_file_ntcreate: reset "
2834                                           "attributes of file %s to 0%o\n",
2835                                           smb_fname_str_dbg(smb_fname),
2836                                           (unsigned int)new_unx_mode));
2837                                 ret = 0; /* Don't do the fchmod below. */
2838                         }
2839                 }
2840
2841                 if ((ret == -1) &&
2842                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
2843                         DEBUG(5, ("open_file_ntcreate: failed to reset "
2844                                   "attributes of file %s to 0%o\n",
2845                                   smb_fname_str_dbg(smb_fname),
2846                                   (unsigned int)new_unx_mode));
2847         }
2848
2849         {
2850                 /*
2851                  * Deal with other opens having a modified write time.
2852                  */
2853                 struct timespec write_time = get_share_mode_write_time(lck);
2854
2855                 if (!null_timespec(write_time)) {
2856                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
2857                 }
2858         }
2859
2860         TALLOC_FREE(lck);
2861
2862         return NT_STATUS_OK;
2863 }
2864
2865
2866 /****************************************************************************
2867  Open a file for for write to ensure that we can fchmod it.
2868 ****************************************************************************/
2869
2870 NTSTATUS open_file_fchmod(connection_struct *conn,
2871                           struct smb_filename *smb_fname,
2872                           files_struct **result)
2873 {
2874         if (!VALID_STAT(smb_fname->st)) {
2875                 return NT_STATUS_INVALID_PARAMETER;
2876         }
2877
2878         return SMB_VFS_CREATE_FILE(
2879                 conn,                                   /* conn */
2880                 NULL,                                   /* req */
2881                 0,                                      /* root_dir_fid */
2882                 smb_fname,                              /* fname */
2883                 FILE_WRITE_DATA,                        /* access_mask */
2884                 (FILE_SHARE_READ | FILE_SHARE_WRITE |   /* share_access */
2885                     FILE_SHARE_DELETE),
2886                 FILE_OPEN,                              /* create_disposition*/
2887                 0,                                      /* create_options */
2888                 0,                                      /* file_attributes */
2889                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
2890                 0,                                      /* allocation_size */
2891                 0,                                      /* private_flags */
2892                 NULL,                                   /* sd */
2893                 NULL,                                   /* ea_list */
2894                 result,                                 /* result */
2895                 NULL);                                  /* pinfo */
2896 }
2897
2898 static NTSTATUS mkdir_internal(connection_struct *conn,
2899                                struct smb_filename *smb_dname,
2900                                uint32 file_attributes)
2901 {
2902         mode_t mode;
2903         char *parent_dir = NULL;
2904         NTSTATUS status;
2905         bool posix_open = false;
2906         bool need_re_stat = false;
2907         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
2908
2909         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
2910                 DEBUG(5,("mkdir_internal: failing share access "
2911                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
2912                 return NT_STATUS_ACCESS_DENIED;
2913         }
2914
2915         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
2916                             NULL)) {
2917                 return NT_STATUS_NO_MEMORY;
2918         }
2919
2920         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2921                 posix_open = true;
2922                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2923         } else {
2924                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
2925         }
2926
2927         status = check_parent_access(conn,
2928                                         smb_dname,
2929                                         access_mask);
2930         if(!NT_STATUS_IS_OK(status)) {
2931                 DEBUG(5,("mkdir_internal: check_parent_access "
2932                         "on directory %s for path %s returned %s\n",
2933                         parent_dir,
2934                         smb_dname->base_name,
2935                         nt_errstr(status) ));
2936                 return status;
2937         }
2938
2939         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
2940                 return map_nt_error_from_unix(errno);
2941         }
2942
2943         /* Ensure we're checking for a symlink here.... */
2944         /* We don't want to get caught by a symlink racer. */
2945
2946         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2947                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2948                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2949                 return map_nt_error_from_unix(errno);
2950         }
2951
2952         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
2953                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
2954                           smb_fname_str_dbg(smb_dname)));
2955                 return NT_STATUS_NOT_A_DIRECTORY;
2956         }
2957
2958         if (lp_store_dos_attributes(SNUM(conn))) {
2959                 if (!posix_open) {
2960                         file_set_dosmode(conn, smb_dname,
2961                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
2962                                          parent_dir, true);
2963                 }
2964         }
2965
2966         if (lp_inherit_permissions(SNUM(conn))) {
2967                 inherit_access_posix_acl(conn, parent_dir,
2968                                          smb_dname->base_name, mode);
2969                 need_re_stat = true;
2970         }
2971
2972         if (!posix_open) {
2973                 /*
2974                  * Check if high bits should have been set,
2975                  * then (if bits are missing): add them.
2976                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
2977                  * dir.
2978                  */
2979                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
2980                     (mode & ~smb_dname->st.st_ex_mode)) {
2981                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
2982                                       (smb_dname->st.st_ex_mode |
2983                                           (mode & ~smb_dname->st.st_ex_mode)));
2984                         need_re_stat = true;
2985                 }
2986         }
2987
2988         /* Change the owner if required. */
2989         if (lp_inherit_owner(SNUM(conn))) {
2990                 change_dir_owner_to_parent(conn, parent_dir,
2991                                            smb_dname->base_name,
2992                                            &smb_dname->st);
2993                 need_re_stat = true;
2994         }
2995
2996         if (need_re_stat) {
2997                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2998                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2999                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3000                         return map_nt_error_from_unix(errno);
3001                 }
3002         }
3003
3004         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
3005                      smb_dname->base_name);
3006
3007         return NT_STATUS_OK;
3008 }
3009
3010 /****************************************************************************
3011  Open a directory from an NT SMB call.
3012 ****************************************************************************/
3013
3014 static NTSTATUS open_directory(connection_struct *conn,
3015                                struct smb_request *req,
3016                                struct smb_filename *smb_dname,
3017                                uint32 access_mask,
3018                                uint32 share_access,
3019                                uint32 create_disposition,
3020                                uint32 create_options,
3021                                uint32 file_attributes,
3022                                int *pinfo,
3023                                files_struct **result)
3024 {
3025         files_struct *fsp = NULL;
3026         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
3027         struct share_mode_lock *lck = NULL;
3028         NTSTATUS status;
3029         struct timespec mtimespec;
3030         int info = 0;
3031
3032         if (is_ntfs_stream_smb_fname(smb_dname)) {
3033                 DEBUG(2, ("open_directory: %s is a stream name!\n",
3034                           smb_fname_str_dbg(smb_dname)));
3035                 return NT_STATUS_NOT_A_DIRECTORY;
3036         }
3037
3038         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
3039                 /* Ensure we have a directory attribute. */
3040                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
3041         }
3042
3043         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
3044                  "share_access = 0x%x create_options = 0x%x, "
3045                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
3046                  smb_fname_str_dbg(smb_dname),
3047                  (unsigned int)access_mask,
3048                  (unsigned int)share_access,
3049                  (unsigned int)create_options,
3050                  (unsigned int)create_disposition,
3051                  (unsigned int)file_attributes));
3052
3053         status = smbd_calculate_access_mask(conn, smb_dname, false,
3054                                             access_mask, &access_mask);
3055         if (!NT_STATUS_IS_OK(status)) {
3056                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
3057                         "on file %s returned %s\n",
3058                         smb_fname_str_dbg(smb_dname),
3059                         nt_errstr(status)));
3060                 return status;
3061         }
3062
3063         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3064                         !security_token_has_privilege(get_current_nttok(conn),
3065                                         SEC_PRIV_SECURITY)) {
3066                 DEBUG(10, ("open_directory: open on %s "
3067                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3068                         smb_fname_str_dbg(smb_dname)));
3069                 return NT_STATUS_PRIVILEGE_NOT_HELD;
3070         }
3071
3072         switch( create_disposition ) {
3073                 case FILE_OPEN:
3074
3075                         if (!dir_existed) {
3076                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3077                         }
3078
3079                         info = FILE_WAS_OPENED;
3080                         break;
3081
3082                 case FILE_CREATE:
3083
3084                         /* If directory exists error. If directory doesn't
3085                          * exist create. */
3086
3087                         if (dir_existed) {
3088                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
3089                                 DEBUG(2, ("open_directory: unable to create "
3090                                           "%s. Error was %s\n",
3091                                           smb_fname_str_dbg(smb_dname),
3092                                           nt_errstr(status)));
3093                                 return status;
3094                         }
3095
3096                         status = mkdir_internal(conn, smb_dname,
3097                                                 file_attributes);
3098
3099                         if (!NT_STATUS_IS_OK(status)) {
3100                                 DEBUG(2, ("open_directory: unable to create "
3101                                           "%s. Error was %s\n",
3102                                           smb_fname_str_dbg(smb_dname),
3103                                           nt_errstr(status)));
3104                                 return status;
3105                         }
3106
3107                         info = FILE_WAS_CREATED;
3108                         break;
3109
3110                 case FILE_OPEN_IF:
3111                         /*
3112                          * If directory exists open. If directory doesn't
3113                          * exist create.
3114                          */
3115
3116                         if (dir_existed) {
3117                                 status = NT_STATUS_OK;
3118                                 info = FILE_WAS_OPENED;
3119                         } else {
3120                                 status = mkdir_internal(conn, smb_dname,
3121                                                 file_attributes);
3122
3123                                 if (NT_STATUS_IS_OK(status)) {
3124                                         info = FILE_WAS_CREATED;
3125                                 } else {
3126                                         /* Cope with create race. */
3127                                         if (!NT_STATUS_EQUAL(status,
3128                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
3129                                                 DEBUG(2, ("open_directory: unable to create "
3130                                                         "%s. Error was %s\n",
3131                                                         smb_fname_str_dbg(smb_dname),
3132                                                         nt_errstr(status)));
3133                                                 return status;
3134                                         }
3135                                         info = FILE_WAS_OPENED;
3136                                 }
3137                         }
3138
3139                         break;
3140
3141                 case FILE_SUPERSEDE:
3142                 case FILE_OVERWRITE:
3143                 case FILE_OVERWRITE_IF:
3144                 default:
3145                         DEBUG(5,("open_directory: invalid create_disposition "
3146                                  "0x%x for directory %s\n",
3147                                  (unsigned int)create_disposition,
3148                                  smb_fname_str_dbg(smb_dname)));
3149                         return NT_STATUS_INVALID_PARAMETER;
3150         }
3151
3152         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
3153                 DEBUG(5,("open_directory: %s is not a directory !\n",
3154                          smb_fname_str_dbg(smb_dname)));
3155                 return NT_STATUS_NOT_A_DIRECTORY;
3156         }
3157
3158         if (info == FILE_WAS_OPENED) {
3159                 status = smbd_check_access_rights(conn,
3160                                                 smb_dname,
3161                                                 false,
3162                                                 access_mask);
3163                 if (!NT_STATUS_IS_OK(status)) {
3164                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
3165                                 "file %s failed with %s\n",
3166                                 smb_fname_str_dbg(smb_dname),
3167                                 nt_errstr(status)));
3168                         return status;
3169                 }
3170         }
3171
3172         status = file_new(req, conn, &fsp);
3173         if(!NT_STATUS_IS_OK(status)) {
3174                 return status;
3175         }
3176
3177         /*
3178          * Setup the files_struct for it.
3179          */
3180
3181         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
3182         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
3183         fsp->file_pid = req ? req->smbpid : 0;
3184         fsp->can_lock = False;
3185         fsp->can_read = False;
3186         fsp->can_write = False;
3187
3188         fsp->share_access = share_access;
3189         fsp->fh->private_options = 0;
3190         /*
3191          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3192          */
3193         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3194         fsp->print_file = NULL;
3195         fsp->modified = False;
3196         fsp->oplock_type = NO_OPLOCK;
3197         fsp->sent_oplock_break = NO_BREAK_SENT;
3198         fsp->is_directory = True;
3199         fsp->posix_open = (file_attributes & FILE_FLAG_POSIX_SEMANTICS) ? True : False;
3200         status = fsp_set_smb_fname(fsp, smb_dname);
3201         if (!NT_STATUS_IS_OK(status)) {
3202                 file_free(req, fsp);
3203                 return status;
3204         }
3205
3206         /* Don't store old timestamps for directory
3207            handles in the internal database. We don't
3208            update them in there if new objects
3209            are creaded in the directory. Currently
3210            we only update timestamps on file writes.
3211            See bug #9870.
3212         */
3213         ZERO_STRUCT(mtimespec);
3214
3215         if (access_mask & (FILE_LIST_DIRECTORY|
3216                            FILE_ADD_FILE|
3217                            FILE_ADD_SUBDIRECTORY|
3218                            FILE_TRAVERSE|
3219                            DELETE_ACCESS|
3220                            FILE_DELETE_CHILD)) {
3221 #ifdef O_DIRECTORY
3222                 status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
3223 #else
3224                 /* POSIX allows us to open a directory with O_RDONLY. */
3225                 status = fd_open(conn, fsp, O_RDONLY, 0);
3226 #endif
3227                 if (!NT_STATUS_IS_OK(status)) {
3228                         DEBUG(5, ("open_directory: Could not open fd for "
3229                                 "%s (%s)\n",
3230                                 smb_fname_str_dbg(smb_dname),
3231                                 nt_errstr(status)));
3232                         file_free(req, fsp);
3233                         return status;
3234                 }
3235         } else {
3236                 fsp->fh->fd = -1;
3237                 DEBUG(10, ("Not opening Directory %s\n",
3238                         smb_fname_str_dbg(smb_dname)));
3239         }
3240
3241         status = vfs_stat_fsp(fsp);
3242         if (!NT_STATUS_IS_OK(status)) {
3243                 fd_close(fsp);
3244                 file_free(req, fsp);
3245                 return status;
3246         }
3247
3248         /* Ensure there was no race condition. */
3249         if (!check_same_stat(&smb_dname->st, &fsp->fsp_name->st)) {
3250                 DEBUG(5,("open_directory: stat struct differs for "
3251                         "directory %s.\n",
3252                         smb_fname_str_dbg(smb_dname)));
3253                 fd_close(fsp);
3254                 file_free(req, fsp);
3255                 return NT_STATUS_ACCESS_DENIED;
3256         }
3257
3258         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
3259                                   conn->connectpath, smb_dname,
3260                                   &mtimespec);
3261
3262         if (lck == NULL) {
3263                 DEBUG(0, ("open_directory: Could not get share mode lock for "
3264                           "%s\n", smb_fname_str_dbg(smb_dname)));
3265                 fd_close(fsp);
3266                 file_free(req, fsp);
3267                 return NT_STATUS_SHARING_VIOLATION;
3268         }
3269
3270         if (has_delete_on_close(lck, fsp->name_hash)) {
3271                 TALLOC_FREE(lck);
3272                 fd_close(fsp);
3273                 file_free(req, fsp);
3274                 return NT_STATUS_DELETE_PENDING;
3275         }
3276
3277         status = open_mode_check(conn, lck,
3278                                  access_mask, share_access);
3279
3280         if (!NT_STATUS_IS_OK(status)) {
3281                 TALLOC_FREE(lck);
3282                 fd_close(fsp);
3283                 file_free(req, fsp);
3284                 return status;
3285         }
3286
3287         if (!set_share_mode(lck, fsp, get_current_uid(conn),
3288                             req ? req->mid : 0, NO_OPLOCK)) {
3289                 TALLOC_FREE(lck);
3290                 fd_close(fsp);
3291                 file_free(req, fsp);
3292                 return NT_STATUS_NO_MEMORY;
3293         }
3294
3295         /* For directories the delete on close bit at open time seems
3296            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
3297         if (create_options & FILE_DELETE_ON_CLOSE) {
3298                 status = can_set_delete_on_close(fsp, 0);
3299                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
3300                         del_share_mode(lck, fsp);
3301                         TALLOC_FREE(lck);
3302                         fd_close(fsp);
3303                         file_free(req, fsp);
3304                         return status;
3305                 }
3306
3307                 if (NT_STATUS_IS_OK(status)) {
3308                         /* Note that here we set the *inital* delete on close flag,
3309                            not the regular one. The magic gets handled in close. */
3310                         fsp->initial_delete_on_close = True;
3311                 }
3312         }
3313
3314         {
3315                 /*
3316                  * Deal with other opens having a modified write time. Is this
3317                  * possible for directories?
3318                  */
3319                 struct timespec write_time = get_share_mode_write_time(lck);
3320
3321                 if (!null_timespec(write_time)) {
3322                         update_stat_ex_mtime(&fsp->fsp_name->st, write_time);
3323                 }
3324         }
3325
3326         TALLOC_FREE(lck);
3327
3328         if (pinfo) {
3329                 *pinfo = info;
3330         }
3331
3332         *result = fsp;
3333         return NT_STATUS_OK;
3334 }
3335
3336 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
3337                           struct smb_filename *smb_dname)
3338 {
3339         NTSTATUS status;
3340         files_struct *fsp;
3341
3342         status = SMB_VFS_CREATE_FILE(
3343                 conn,                                   /* conn */
3344                 req,                                    /* req */
3345                 0,                                      /* root_dir_fid */
3346                 smb_dname,                              /* fname */
3347                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3348                 FILE_SHARE_NONE,                        /* share_access */
3349                 FILE_CREATE,                            /* create_disposition*/
3350                 FILE_DIRECTORY_FILE,                    /* create_options */
3351                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
3352                 0,                                      /* oplock_request */
3353                 0,                                      /* allocation_size */
3354                 0,                                      /* private_flags */
3355                 NULL,                                   /* sd */
3356                 NULL,                                   /* ea_list */
3357                 &fsp,                                   /* result */
3358                 NULL);                                  /* pinfo */
3359
3360         if (NT_STATUS_IS_OK(status)) {
3361                 close_file(req, fsp, NORMAL_CLOSE);
3362         }
3363
3364         return status;
3365 }
3366
3367 /****************************************************************************
3368  Receive notification that one of our open files has been renamed by another
3369  smbd process.
3370 ****************************************************************************/
3371
3372 void msg_file_was_renamed(struct messaging_context *msg,
3373                           void *private_data,
3374                           uint32_t msg_type,
3375                           struct server_id server_id,
3376                           DATA_BLOB *data)
3377 {
3378         files_struct *fsp;
3379         char *frm = (char *)data->data;
3380         struct file_id id;
3381         const char *sharepath;
3382         const char *base_name;
3383         const char *stream_name;
3384         struct smb_filename *smb_fname = NULL;
3385         size_t sp_len, bn_len;
3386         NTSTATUS status;
3387         struct smbd_server_connection *sconn =
3388                 talloc_get_type_abort(private_data,
3389                 struct smbd_server_connection);
3390
3391         if (data->data == NULL
3392             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
3393                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
3394                           (int)data->length));
3395                 return;
3396         }
3397
3398         /* Unpack the message. */
3399         pull_file_id_24(frm, &id);
3400         sharepath = &frm[24];
3401         sp_len = strlen(sharepath);
3402         base_name = sharepath + sp_len + 1;
3403         bn_len = strlen(base_name);
3404         stream_name = sharepath + sp_len + 1 + bn_len + 1;
3405
3406         /* stream_name must always be NULL if there is no stream. */
3407         if (stream_name[0] == '\0') {
3408                 stream_name = NULL;
3409         }
3410
3411         smb_fname = synthetic_smb_fname(talloc_tos(), base_name,
3412                                         stream_name, NULL);
3413         if (smb_fname == NULL) {
3414                 return;
3415         }
3416
3417         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
3418                 "file_id %s\n",
3419                 sharepath, smb_fname_str_dbg(smb_fname),
3420                 file_id_string_tos(&id)));
3421
3422         for(fsp = file_find_di_first(sconn, id); fsp;
3423             fsp = file_find_di_next(fsp)) {
3424                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
3425
3426                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
3427                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
3428                                 smb_fname_str_dbg(smb_fname)));
3429                         status = fsp_set_smb_fname(fsp, smb_fname);
3430                         if (!NT_STATUS_IS_OK(status)) {
3431                                 goto out;
3432                         }
3433                 } else {
3434                         /* TODO. JRA. */
3435                         /* Now we have the complete path we can work out if this is
3436                            actually within this share and adjust newname accordingly. */
3437                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
3438                                 "not sharepath %s) "
3439                                 "%s from %s -> %s\n",
3440                                 fsp->conn->connectpath,
3441                                 sharepath,
3442                                 fsp_fnum_dbg(fsp),
3443                                 fsp_str_dbg(fsp),
3444                                 smb_fname_str_dbg(smb_fname)));
3445                 }
3446         }
3447  out:
3448         TALLOC_FREE(smb_fname);
3449         return;
3450 }
3451
3452 /*
3453  * If a main file is opened for delete, all streams need to be checked for
3454  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
3455  * If that works, delete them all by setting the delete on close and close.
3456  */
3457
3458 NTSTATUS open_streams_for_delete(connection_struct *conn,
3459                                         const char *fname)
3460 {
3461         struct stream_struct *stream_info = NULL;
3462         files_struct **streams = NULL;
3463         int i;
3464         unsigned int num_streams = 0;
3465         TALLOC_CTX *frame = talloc_stackframe();
3466         NTSTATUS status;
3467
3468         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
3469                                 &num_streams, &stream_info);
3470
3471         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
3472             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
3473                 DEBUG(10, ("no streams around\n"));
3474                 TALLOC_FREE(frame);
3475                 return NT_STATUS_OK;
3476         }
3477
3478         if (!NT_STATUS_IS_OK(status)) {
3479                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
3480                            nt_errstr(status)));
3481                 goto fail;
3482         }
3483
3484         DEBUG(10, ("open_streams_for_delete found %d streams\n",
3485                    num_streams));
3486
3487         if (num_streams == 0) {
3488                 TALLOC_FREE(frame);
3489                 return NT_STATUS_OK;
3490         }
3491
3492         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
3493         if (streams == NULL) {
3494                 DEBUG(0, ("talloc failed\n"));
3495                 status = NT_STATUS_NO_MEMORY;
3496                 goto fail;
3497         }
3498
3499         for (i=0; i<num_streams; i++) {
3500                 struct smb_filename *smb_fname;
3501
3502                 if (strequal(stream_info[i].name, "::$DATA")) {
3503                         streams[i] = NULL;
3504                         continue;
3505                 }
3506
3507                 smb_fname = synthetic_smb_fname(
3508                         talloc_tos(), fname, stream_info[i].name, NULL);
3509                 if (smb_fname == NULL) {
3510                         status = NT_STATUS_NO_MEMORY;
3511                         goto fail;
3512                 }
3513
3514                 if (SMB_VFS_STAT(conn, smb_fname) == -1) {
3515                         DEBUG(10, ("Unable to stat stream: %s\n",
3516                                    smb_fname_str_dbg(smb_fname)));
3517                 }
3518
3519                 status = SMB_VFS_CREATE_FILE(
3520                          conn,                  /* conn */
3521                          NULL,                  /* req */
3522                          0,                     /* root_dir_fid */
3523                          smb_fname,             /* fname */
3524                          DELETE_ACCESS,         /* access_mask */
3525                          (FILE_SHARE_READ |     /* share_access */
3526                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
3527                          FILE_OPEN,             /* create_disposition*/
3528                          0,                     /* create_options */
3529                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
3530                          0,                     /* oplock_request */
3531                          0,                     /* allocation_size */
3532                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
3533                          NULL,                  /* sd */
3534                          NULL,                  /* ea_list */
3535                          &streams[i],           /* result */
3536                          NULL);                 /* pinfo */
3537
3538                 if (!NT_STATUS_IS_OK(status)) {
3539                         DEBUG(10, ("Could not open stream %s: %s\n",
3540                                    smb_fname_str_dbg(smb_fname),
3541                                    nt_errstr(status)));
3542
3543                         TALLOC_FREE(smb_fname);
3544                         break;
3545                 }
3546                 TALLOC_FREE(smb_fname);
3547         }
3548
3549         /*
3550          * don't touch the variable "status" beyond this point :-)
3551          */
3552
3553         for (i -= 1 ; i >= 0; i--) {
3554                 if (streams[i] == NULL) {
3555                         continue;
3556                 }
3557
3558                 DEBUG(10, ("Closing stream # %d, %s\n", i,
3559                            fsp_str_dbg(streams[i])));
3560                 close_file(NULL, streams[i], NORMAL_CLOSE);
3561         }
3562
3563  fail:
3564         TALLOC_FREE(frame);
3565         return status;
3566 }
3567
3568 /*********************************************************************
3569  Create a default ACL by inheriting from the parent. If no inheritance
3570  from the parent available, don't set anything. This will leave the actual
3571  permissions the new file or directory already got from the filesystem
3572  as the NT ACL when read.
3573 *********************************************************************/
3574
3575 static NTSTATUS inherit_new_acl(files_struct *fsp)
3576 {
3577         TALLOC_CTX *frame = talloc_stackframe();
3578         char *parent_name = NULL;
3579         struct security_descriptor *parent_desc = NULL;
3580         NTSTATUS status = NT_STATUS_OK;
3581         struct security_descriptor *psd = NULL;
3582         const struct dom_sid *owner_sid = NULL;
3583         const struct dom_sid *group_sid = NULL;
3584         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
3585         struct security_token *token = fsp->conn->session_info->security_token;
3586         bool inherit_owner = lp_inherit_owner(SNUM(fsp->conn));
3587         bool inheritable_components = false;
3588         bool try_builtin_administrators = false;
3589         const struct dom_sid *BA_U_sid = NULL;
3590         const struct dom_sid *BA_G_sid = NULL;
3591         bool try_system = false;
3592         const struct dom_sid *SY_U_sid = NULL;
3593         const struct dom_sid *SY_G_sid = NULL;
3594         size_t size = 0;
3595
3596         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
3597                 TALLOC_FREE(frame);
3598                 return NT_STATUS_NO_MEMORY;
3599         }
3600
3601         status = SMB_VFS_GET_NT_ACL(fsp->conn,
3602                                     parent_name,
3603                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
3604                                     frame,
3605                                     &parent_desc);
3606         if (!NT_STATUS_IS_OK(status)) {
3607                 TALLOC_FREE(frame);
3608                 return status;
3609         }
3610
3611         inheritable_components = sd_has_inheritable_components(parent_desc,
3612                                         fsp->is_directory);
3613
3614         if (!inheritable_components && !inherit_owner) {
3615                 TALLOC_FREE(frame);
3616                 /* Nothing to inherit and not setting owner. */
3617                 return NT_STATUS_OK;
3618         }
3619
3620         /* Create an inherited descriptor from the parent. */
3621
3622         if (DEBUGLEVEL >= 10) {
3623                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
3624                         fsp_str_dbg(fsp) ));
3625                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
3626         }
3627
3628         /* Inherit from parent descriptor if "inherit owner" set. */
3629         if (inherit_owner) {
3630                 owner_sid = parent_desc->owner_sid;
3631                 group_sid = parent_desc->group_sid;
3632         }
3633
3634         if (owner_sid == NULL) {
3635                 if (security_token_has_builtin_administrators(token)) {
3636                         try_builtin_administrators = true;
3637                 } else if (security_token_is_system(token)) {
3638                         try_builtin_administrators = true;
3639                         try_system = true;
3640                 }
3641         }
3642
3643         if (group_sid == NULL &&
3644             token->num_sids == PRIMARY_GROUP_SID_INDEX)
3645         {
3646                 if (security_token_is_system(token)) {
3647                         try_builtin_administrators = true;
3648                         try_system = true;
3649                 }
3650         }
3651
3652         if (try_builtin_administrators) {
3653                 struct unixid ids;
3654                 bool ok;
3655
3656                 ZERO_STRUCT(ids);
3657                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
3658                 if (ok) {
3659                         switch (ids.type) {
3660                         case ID_TYPE_BOTH:
3661                                 BA_U_sid = &global_sid_Builtin_Administrators;
3662                                 BA_G_sid = &global_sid_Builtin_Administrators;
3663                                 break;
3664                         case ID_TYPE_UID:
3665                                 BA_U_sid = &global_sid_Builtin_Administrators;
3666                                 break;
3667                         case ID_TYPE_GID:
3668                                 BA_G_sid = &global_sid_Builtin_Administrators;
3669                                 break;
3670                         default:
3671                                 break;
3672                         }
3673                 }
3674         }
3675
3676         if (try_system) {
3677                 struct unixid ids;
3678                 bool ok;
3679
3680                 ZERO_STRUCT(ids);
3681                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
3682                 if (ok) {
3683                         switch (ids.type) {
3684                         case ID_TYPE_BOTH:
3685                                 SY_U_sid = &global_sid_System;
3686                                 SY_G_sid = &global_sid_System;
3687                                 break;
3688                         case ID_TYPE_UID:
3689                                 SY_U_sid = &global_sid_System;
3690                                 break;
3691                         case ID_TYPE_GID:
3692                                 SY_G_sid = &global_sid_System;
3693                                 break;
3694                         default:
3695                                 break;
3696                         }
3697                 }
3698         }
3699
3700         if (owner_sid == NULL) {
3701                 owner_sid = BA_U_sid;
3702         }
3703
3704         if (owner_sid == NULL) {
3705                 owner_sid = SY_U_sid;
3706         }
3707
3708         if (group_sid == NULL) {
3709                 group_sid = SY_G_sid;
3710         }
3711
3712         if (try_system && group_sid == NULL) {
3713                 group_sid = BA_G_sid;
3714         }
3715
3716         if (owner_sid == NULL) {
3717                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3718         }
3719         if (group_sid == NULL) {
3720                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
3721                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3722                 } else {
3723                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
3724                 }
3725         }
3726
3727         status = se_create_child_secdesc(frame,
3728                         &psd,
3729                         &size,
3730                         parent_desc,
3731                         owner_sid,
3732                         group_sid,
3733                         fsp->is_directory);
3734         if (!NT_STATUS_IS_OK(status)) {
3735                 TALLOC_FREE(frame);
3736                 return status;
3737         }
3738
3739         /* If inheritable_components == false,
3740            se_create_child_secdesc()
3741            creates a security desriptor with a NULL dacl
3742            entry, but with SEC_DESC_DACL_PRESENT. We need
3743            to remove that flag. */
3744
3745         if (!inheritable_components) {
3746                 security_info_sent &= ~SECINFO_DACL;
3747                 psd->type &= ~SEC_DESC_DACL_PRESENT;
3748         }
3749
3750         if (DEBUGLEVEL >= 10) {
3751                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
3752                         fsp_str_dbg(fsp) ));
3753                 NDR_PRINT_DEBUG(security_descriptor, psd);
3754         }
3755
3756         if (inherit_owner) {
3757                 /* We need to be root to force this. */
3758                 become_root();
3759         }
3760         status = SMB_VFS_FSET_NT_ACL(fsp,
3761                         security_info_sent,
3762                         psd);
3763         if (inherit_owner) {
3764                 unbecome_root();
3765         }
3766         TALLOC_FREE(frame);
3767         return status;
3768 }
3769
3770 /*
3771  * Wrapper around open_file_ntcreate and open_directory
3772  */
3773
3774 static NTSTATUS create_file_unixpath(connection_struct *conn,
3775                                      struct smb_request *req,
3776                                      struct smb_filename *smb_fname,
3777                                      uint32_t access_mask,
3778                                      uint32_t share_access,
3779                                      uint32_t create_disposition,
3780                                      uint32_t create_options,
3781                                      uint32_t file_attributes,
3782                                      uint32_t oplock_request,
3783                                      uint64_t allocation_size,
3784                                      uint32_t private_flags,
3785                                      struct security_descriptor *sd,
3786                                      struct ea_list *ea_list,
3787
3788                                      files_struct **result,
3789                                      int *pinfo)
3790 {
3791         int info = FILE_WAS_OPENED;
3792         files_struct *base_fsp = NULL;
3793         files_struct *fsp = NULL;
3794         NTSTATUS status;
3795
3796         DEBUG(10,("create_file_unixpath: access_mask = 0x%x "
3797                   "file_attributes = 0x%x, share_access = 0x%x, "
3798                   "create_disposition = 0x%x create_options = 0x%x "
3799                   "oplock_request = 0x%x private_flags = 0x%x "
3800                   "ea_list = 0x%p, sd = 0x%p, "
3801                   "fname = %s\n",
3802                   (unsigned int)access_mask,
3803                   (unsigned int)file_attributes,
3804                   (unsigned int)share_access,
3805                   (unsigned int)create_disposition,
3806                   (unsigned int)create_options,
3807                   (unsigned int)oplock_request,
3808                   (unsigned int)private_flags,
3809                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
3810
3811         if (create_options & FILE_OPEN_BY_FILE_ID) {
3812                 status = NT_STATUS_NOT_SUPPORTED;
3813                 goto fail;
3814         }
3815
3816         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
3817                 status = NT_STATUS_INVALID_PARAMETER;
3818                 goto fail;
3819         }
3820
3821         if (req == NULL) {
3822                 oplock_request |= INTERNAL_OPEN_ONLY;
3823         }
3824
3825         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3826             && (access_mask & DELETE_ACCESS)
3827             && !is_ntfs_stream_smb_fname(smb_fname)) {
3828                 /*
3829                  * We can't open a file with DELETE access if any of the
3830                  * streams is open without FILE_SHARE_DELETE
3831                  */
3832                 status = open_streams_for_delete(conn, smb_fname->base_name);
3833
3834                 if (!NT_STATUS_IS_OK(status)) {
3835                         goto fail;
3836                 }
3837         }
3838
3839         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3840                         !security_token_has_privilege(get_current_nttok(conn),
3841                                         SEC_PRIV_SECURITY)) {
3842                 DEBUG(10, ("create_file_unixpath: open on %s "
3843                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3844                         smb_fname_str_dbg(smb_fname)));
3845                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
3846                 goto fail;
3847         }
3848
3849         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3850             && is_ntfs_stream_smb_fname(smb_fname)
3851             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
3852                 uint32 base_create_disposition;
3853                 struct smb_filename *smb_fname_base = NULL;
3854
3855                 if (create_options & FILE_DIRECTORY_FILE) {
3856                         status = NT_STATUS_NOT_A_DIRECTORY;
3857                         goto fail;
3858                 }
3859
3860                 switch (create_disposition) {
3861                 case FILE_OPEN:
3862                         base_create_disposition = FILE_OPEN;
3863                         break;
3864                 default:
3865                         base_create_disposition = FILE_OPEN_IF;
3866                         break;
3867                 }
3868
3869                 /* Create an smb_filename with stream_name == NULL. */
3870                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
3871                                                      smb_fname->base_name,
3872                                                      NULL, NULL);
3873                 if (smb_fname_base == NULL) {
3874                         status = NT_STATUS_NO_MEMORY;
3875                         goto fail;
3876                 }
3877
3878                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
3879                         DEBUG(10, ("Unable to stat stream: %s\n",
3880                                    smb_fname_str_dbg(smb_fname_base)));
3881                 } else {
3882                         /*
3883                          * https://bugzilla.samba.org/show_bug.cgi?id=10229
3884                          * We need to check if the requested access mask
3885                          * could be used to open the underlying file (if
3886                          * it existed), as we're passing in zero for the
3887                          * access mask to the base filename.
3888                          */
3889                         status = check_base_file_access(conn,
3890                                                         smb_fname_base,
3891                                                         access_mask);
3892
3893                         if (!NT_STATUS_IS_OK(status)) {
3894                                 DEBUG(10, ("Permission check "
3895                                         "for base %s failed: "
3896                                         "%s\n", smb_fname->base_name,
3897                                         nt_errstr(status)));
3898                                 goto fail;
3899                         }
3900                 }
3901
3902                 /* Open the base file. */
3903                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
3904                                               FILE_SHARE_READ
3905                                               | FILE_SHARE_WRITE
3906                                               | FILE_SHARE_DELETE,
3907                                               base_create_disposition,
3908                                               0, 0, 0, 0, 0, NULL, NULL,
3909                                               &base_fsp, NULL);
3910                 TALLOC_FREE(smb_fname_base);
3911
3912                 if (!NT_STATUS_IS_OK(status)) {
3913                         DEBUG(10, ("create_file_unixpath for base %s failed: "
3914                                    "%s\n", smb_fname->base_name,
3915                                    nt_errstr(status)));
3916                         goto fail;
3917                 }
3918                 /* we don't need to low level fd */
3919                 fd_close(base_fsp);
3920         }
3921
3922         /*
3923          * If it's a request for a directory open, deal with it separately.
3924          */
3925
3926         if (create_options & FILE_DIRECTORY_FILE) {
3927
3928                 if (create_options & FILE_NON_DIRECTORY_FILE) {
3929                         status = NT_STATUS_INVALID_PARAMETER;
3930                         goto fail;
3931                 }
3932
3933                 /* Can't open a temp directory. IFS kit test. */
3934                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
3935                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
3936                         status = NT_STATUS_INVALID_PARAMETER;
3937                         goto fail;
3938                 }
3939
3940                 /*
3941                  * We will get a create directory here if the Win32
3942                  * app specified a security descriptor in the
3943                  * CreateDirectory() call.
3944                  */
3945
3946                 oplock_request = 0;
3947                 status = open_directory(
3948                         conn, req, smb_fname, access_mask, share_access,
3949                         create_disposition, create_options, file_attributes,
3950                         &info, &fsp);
3951         } else {
3952
3953                 /*
3954                  * Ordinary file case.
3955                  */
3956
3957                 status = file_new(req, conn, &fsp);
3958                 if(!NT_STATUS_IS_OK(status)) {
3959                         goto fail;
3960                 }
3961
3962                 status = fsp_set_smb_fname(fsp, smb_fname);
3963                 if (!NT_STATUS_IS_OK(status)) {
3964                         goto fail;
3965                 }
3966
3967                 if (base_fsp) {
3968                         /*
3969                          * We're opening the stream element of a
3970                          * base_fsp we already opened. Set up the
3971                          * base_fsp pointer.
3972                          */
3973                         fsp->base_fsp = base_fsp;
3974                 }
3975
3976                 if (allocation_size) {
3977                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
3978                                                         allocation_size);
3979                 }
3980
3981                 status = open_file_ntcreate(conn,
3982                                             req,
3983                                             access_mask,
3984                                             share_access,
3985                                             create_disposition,
3986                                             create_options,
3987                                             file_attributes,
3988                                             oplock_request,
3989                                             private_flags,
3990                                             &info,
3991                                             fsp);
3992
3993                 if(!NT_STATUS_IS_OK(status)) {
3994                         file_free(req, fsp);
3995                         fsp = NULL;
3996                 }
3997
3998                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
3999
4000                         /* A stream open never opens a directory */
4001
4002                         if (base_fsp) {
4003                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
4004                                 goto fail;
4005                         }
4006
4007                         /*
4008                          * Fail the open if it was explicitly a non-directory
4009                          * file.
4010                          */
4011
4012                         if (create_options & FILE_NON_DIRECTORY_FILE) {
4013                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
4014                                 goto fail;
4015                         }
4016
4017                         oplock_request = 0;
4018                         status = open_directory(
4019                                 conn, req, smb_fname, access_mask,
4020                                 share_access, create_disposition,
4021                                 create_options, file_attributes,
4022                                 &info, &fsp);
4023                 }
4024         }
4025
4026         if (!NT_STATUS_IS_OK(status)) {
4027                 goto fail;
4028         }
4029
4030         fsp->base_fsp = base_fsp;
4031
4032         if ((ea_list != NULL) &&
4033             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
4034                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
4035                 if (!NT_STATUS_IS_OK(status)) {
4036                         goto fail;
4037                 }
4038         }
4039
4040         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
4041                 status = NT_STATUS_ACCESS_DENIED;
4042                 goto fail;
4043         }
4044
4045         /* Save the requested allocation size. */
4046         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
4047                 if (allocation_size
4048                     && (allocation_size > fsp->fsp_name->st.st_ex_size)) {
4049                         fsp->initial_allocation_size = smb_roundup(
4050                                 fsp->conn, allocation_size);
4051                         if (fsp->is_directory) {
4052                                 /* Can't set allocation size on a directory. */
4053                                 status = NT_STATUS_ACCESS_DENIED;
4054                                 goto fail;
4055                         }
4056                         if (vfs_allocate_file_space(
4057                                     fsp, fsp->initial_allocation_size) == -1) {
4058                                 status = NT_STATUS_DISK_FULL;
4059                                 goto fail;
4060                         }
4061                 } else {
4062                         fsp->initial_allocation_size = smb_roundup(
4063                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
4064                 }
4065         } else {
4066                 fsp->initial_allocation_size = 0;
4067         }
4068
4069         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
4070                                 fsp->base_fsp == NULL) {
4071                 if (sd != NULL) {
4072                         /*
4073                          * According to the MS documentation, the only time the security
4074                          * descriptor is applied to the opened file is iff we *created* the
4075                          * file; an existing file stays the same.
4076                          *
4077                          * Also, it seems (from observation) that you can open the file with
4078                          * any access mask but you can still write the sd. We need to override
4079                          * the granted access before we call set_sd
4080                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
4081                          */
4082
4083                         uint32_t sec_info_sent;
4084                         uint32_t saved_access_mask = fsp->access_mask;
4085
4086                         sec_info_sent = get_sec_info(sd);
4087
4088                         fsp->access_mask = FILE_GENERIC_ALL;
4089
4090                         if (sec_info_sent & (SECINFO_OWNER|
4091                                                 SECINFO_GROUP|
4092                                                 SECINFO_DACL|
4093                                                 SECINFO_SACL)) {
4094                                 status = set_sd(fsp, sd, sec_info_sent);
4095                         }
4096
4097                         fsp->access_mask = saved_access_mask;
4098
4099                         if (!NT_STATUS_IS_OK(status)) {
4100                                 goto fail;
4101                         }
4102                 } else if (lp_inherit_acls(SNUM(conn))) {
4103                         /* Inherit from parent. Errors here are not fatal. */
4104                         status = inherit_new_acl(fsp);
4105                         if (!NT_STATUS_IS_OK(status)) {
4106                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
4107                                         fsp_str_dbg(fsp),
4108                                         nt_errstr(status) ));
4109                         }
4110                 }
4111         }
4112
4113         if ((conn->fs_capabilities & FILE_FILE_COMPRESSION)
4114          && (create_options & FILE_NO_COMPRESSION)
4115          && (info == FILE_WAS_CREATED)) {
4116                 status = SMB_VFS_SET_COMPRESSION(conn, fsp, fsp,
4117                                                  COMPRESSION_FORMAT_NONE);
4118                 if (!NT_STATUS_IS_OK(status)) {
4119                         DEBUG(1, ("failed to disable compression: %s\n",
4120                                   nt_errstr(status)));
4121                 }
4122         }
4123
4124         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
4125
4126         *result = fsp;
4127         if (pinfo != NULL) {
4128                 *pinfo = info;
4129         }
4130
4131         smb_fname->st = fsp->fsp_name->st;
4132
4133         return NT_STATUS_OK;
4134
4135  fail:
4136         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
4137
4138         if (fsp != NULL) {
4139                 if (base_fsp && fsp->base_fsp == base_fsp) {
4140                         /*
4141                          * The close_file below will close
4142                          * fsp->base_fsp.
4143                          */
4144                         base_fsp = NULL;
4145                 }
4146                 close_file(req, fsp, ERROR_CLOSE);
4147                 fsp = NULL;
4148         }
4149         if (base_fsp != NULL) {
4150                 close_file(req, base_fsp, ERROR_CLOSE);
4151                 base_fsp = NULL;
4152         }
4153         return status;
4154 }
4155
4156 /*
4157  * Calculate the full path name given a relative fid.
4158  */
4159 NTSTATUS get_relative_fid_filename(connection_struct *conn,
4160                                    struct smb_request *req,
4161                                    uint16_t root_dir_fid,
4162                                    const struct smb_filename *smb_fname,
4163                                    struct smb_filename **smb_fname_out)
4164 {
4165         files_struct *dir_fsp;
4166         char *parent_fname = NULL;
4167         char *new_base_name = NULL;
4168         NTSTATUS status;
4169
4170         if (root_dir_fid == 0 || !smb_fname) {
4171                 status = NT_STATUS_INTERNAL_ERROR;
4172                 goto out;
4173         }
4174
4175         dir_fsp = file_fsp(req, root_dir_fid);
4176
4177         if (dir_fsp == NULL) {
4178                 status = NT_STATUS_INVALID_HANDLE;
4179                 goto out;
4180         }
4181
4182         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
4183                 status = NT_STATUS_INVALID_HANDLE;
4184                 goto out;
4185         }
4186
4187         if (!dir_fsp->is_directory) {
4188
4189                 /*
4190                  * Check to see if this is a mac fork of some kind.
4191                  */
4192
4193                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
4194                     is_ntfs_stream_smb_fname(smb_fname)) {
4195                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
4196                         goto out;
4197                 }
4198
4199                 /*
4200                   we need to handle the case when we get a
4201                   relative open relative to a file and the
4202                   pathname is blank - this is a reopen!
4203                   (hint from demyn plantenberg)
4204                 */
4205
4206                 status = NT_STATUS_INVALID_HANDLE;
4207                 goto out;
4208         }
4209
4210         if (ISDOT(dir_fsp->fsp_name->base_name)) {
4211                 /*
4212                  * We're at the toplevel dir, the final file name
4213                  * must not contain ./, as this is filtered out
4214                  * normally by srvstr_get_path and unix_convert
4215                  * explicitly rejects paths containing ./.
4216                  */
4217                 parent_fname = talloc_strdup(talloc_tos(), "");
4218                 if (parent_fname == NULL) {
4219                         status = NT_STATUS_NO_MEMORY;
4220                         goto out;
4221                 }
4222         } else {
4223                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
4224
4225                 /*
4226                  * Copy in the base directory name.
4227                  */
4228
4229                 parent_fname = talloc_array(talloc_tos(), char,
4230                     dir_name_len+2);
4231                 if (parent_fname == NULL) {
4232                         status = NT_STATUS_NO_MEMORY;
4233                         goto out;
4234                 }
4235                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
4236                     dir_name_len+1);
4237
4238                 /*
4239                  * Ensure it ends in a '/'.
4240                  * We used TALLOC_SIZE +2 to add space for the '/'.
4241                  */
4242
4243                 if(dir_name_len
4244                     && (parent_fname[dir_name_len-1] != '\\')
4245                     && (parent_fname[dir_name_len-1] != '/')) {
4246                         parent_fname[dir_name_len] = '/';
4247                         parent_fname[dir_name_len+1] = '\0';
4248                 }
4249         }
4250
4251         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
4252                                         smb_fname->base_name);
4253         if (new_base_name == NULL) {
4254                 status = NT_STATUS_NO_MEMORY;
4255                 goto out;
4256         }
4257
4258         status = filename_convert(req,
4259                                 conn,
4260                                 req->flags2 & FLAGS2_DFS_PATHNAMES,
4261                                 new_base_name,
4262                                 0,
4263                                 NULL,
4264                                 smb_fname_out);
4265         if (!NT_STATUS_IS_OK(status)) {
4266                 goto out;
4267         }
4268
4269  out:
4270         TALLOC_FREE(parent_fname);
4271         TALLOC_FREE(new_base_name);
4272         return status;
4273 }
4274
4275 NTSTATUS create_file_default(connection_struct *conn,
4276                              struct smb_request *req,
4277                              uint16_t root_dir_fid,
4278                              struct smb_filename *smb_fname,
4279                              uint32_t access_mask,
4280                              uint32_t share_access,
4281                              uint32_t create_disposition,
4282                              uint32_t create_options,
4283                              uint32_t file_attributes,
4284                              uint32_t oplock_request,
4285                              uint64_t allocation_size,
4286                              uint32_t private_flags,
4287                              struct security_descriptor *sd,
4288                              struct ea_list *ea_list,
4289                              files_struct **result,
4290                              int *pinfo)
4291 {
4292         int info = FILE_WAS_OPENED;
4293         files_struct *fsp = NULL;
4294         NTSTATUS status;
4295         bool stream_name = false;
4296
4297         DEBUG(10,("create_file: access_mask = 0x%x "
4298                   "file_attributes = 0x%x, share_access = 0x%x, "
4299                   "create_disposition = 0x%x create_options = 0x%x "
4300                   "oplock_request = 0x%x "
4301                   "private_flags = 0x%x "
4302                   "root_dir_fid = 0x%x, ea_list = 0x%p, sd = 0x%p, "
4303                   "fname = %s\n",
4304                   (unsigned int)access_mask,
4305                   (unsigned int)file_attributes,
4306                   (unsigned int)share_access,
4307                   (unsigned int)create_disposition,
4308                   (unsigned int)create_options,
4309                   (unsigned int)oplock_request,
4310                   (unsigned int)private_flags,
4311                   (unsigned int)root_dir_fid,
4312                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4313
4314         /*
4315          * Calculate the filename from the root_dir_if if necessary.
4316          */
4317
4318         if (root_dir_fid != 0) {
4319                 struct smb_filename *smb_fname_out = NULL;
4320                 status = get_relative_fid_filename(conn, req, root_dir_fid,
4321                                                    smb_fname, &smb_fname_out);
4322                 if (!NT_STATUS_IS_OK(status)) {
4323                         goto fail;
4324                 }
4325                 smb_fname = smb_fname_out;
4326         }
4327
4328         /*
4329          * Check to see if this is a mac fork of some kind.
4330          */
4331
4332         stream_name = is_ntfs_stream_smb_fname(smb_fname);
4333         if (stream_name) {
4334                 enum FAKE_FILE_TYPE fake_file_type;
4335
4336                 fake_file_type = is_fake_file(smb_fname);
4337
4338                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
4339
4340                         /*
4341                          * Here we go! support for changing the disk quotas
4342                          * --metze
4343                          *
4344                          * We need to fake up to open this MAGIC QUOTA file
4345                          * and return a valid FID.
4346                          *
4347                          * w2k close this file directly after openening xp
4348                          * also tries a QUERY_FILE_INFO on the file and then
4349                          * close it
4350                          */
4351                         status = open_fake_file(req, conn, req->vuid,
4352                                                 fake_file_type, smb_fname,
4353                                                 access_mask, &fsp);
4354                         if (!NT_STATUS_IS_OK(status)) {
4355                                 goto fail;
4356                         }
4357
4358                         ZERO_STRUCT(smb_fname->st);
4359                         goto done;
4360                 }
4361
4362                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
4363                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
4364                         goto fail;
4365                 }
4366         }
4367
4368         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
4369                 int ret;
4370                 smb_fname->stream_name = NULL;
4371                 /* We have to handle this error here. */
4372                 if (create_options & FILE_DIRECTORY_FILE) {
4373                         status = NT_STATUS_NOT_A_DIRECTORY;
4374                         goto fail;
4375                 }
4376                 if (lp_posix_pathnames()) {
4377                         ret = SMB_VFS_LSTAT(conn, smb_fname);
4378                 } else {
4379                         ret = SMB_VFS_STAT(conn, smb_fname);
4380                 }
4381
4382                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
4383                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
4384                         goto fail;
4385                 }
4386         }
4387
4388         status = create_file_unixpath(
4389                 conn, req, smb_fname, access_mask, share_access,
4390                 create_disposition, create_options, file_attributes,
4391                 oplock_request, allocation_size, private_flags,
4392                 sd, ea_list,
4393                 &fsp, &info);
4394
4395         if (!NT_STATUS_IS_OK(status)) {
4396                 goto fail;
4397         }
4398
4399  done:
4400         DEBUG(10, ("create_file: info=%d\n", info));
4401
4402         *result = fsp;
4403         if (pinfo != NULL) {
4404                 *pinfo = info;
4405         }
4406         return NT_STATUS_OK;
4407
4408  fail:
4409         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
4410
4411         if (fsp != NULL) {
4412                 close_file(req, fsp, ERROR_CLOSE);
4413                 fsp = NULL;
4414         }
4415         return status;
4416 }