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 "passdb/lookup_sid.h"
  33 #include "auth.h"
  34 #include "serverid.h"
  35 #include "messages.h"
  36 #include "source3/lib/dbwrap/dbwrap_watch.h"
  37
  38 extern const struct generic_mapping file_generic_mapping;
  39
  40 struct deferred_open_record {
  41         bool delayed_for_oplocks;
  42         bool async_open;
  43         struct file_id id;
  44 };
  45
  46 /****************************************************************************
  47  If the requester wanted DELETE_ACCESS and was rejected because
  48  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  49  overrides this.
  50 ****************************************************************************/
  51
  52 static bool parent_override_delete(connection_struct *conn,
  53                                         const struct smb_filename *smb_fname,
  54                                         uint32_t access_mask,
  55                                         uint32_t rejected_mask)
  56 {
  57         if ((access_mask & DELETE_ACCESS) &&
  58                     (rejected_mask & DELETE_ACCESS) &&
  59                     can_delete_file_in_directory(conn, smb_fname)) {
  60                 return true;
  61         }
  62         return false;
  63 }
  64
  65 /****************************************************************************
  66  Check if we have open rights.
  67 ****************************************************************************/
  68
  69 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  70                                 const struct smb_filename *smb_fname,
  71                                 bool use_privs,
  72                                 uint32_t access_mask)
  73 {
  74         /* Check if we have rights to open. */
  75         NTSTATUS status;
  76         struct security_descriptor *sd = NULL;
  77         uint32_t rejected_share_access;
  78         uint32_t rejected_mask = access_mask;
  79         uint32_t do_not_check_mask = 0;
  80
  81         rejected_share_access = access_mask & ~(conn->share_access);
  82
  83         if (rejected_share_access) {
  84                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  85                         "on %s (0x%x)\n",
  86                         (unsigned int)access_mask,
  87                         smb_fname_str_dbg(smb_fname),
  88                         (unsigned int)rejected_share_access ));
  89                 return NT_STATUS_ACCESS_DENIED;
  90         }
  91
  92         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
  93                 /* I'm sorry sir, I didn't know you were root... */
  94                 DEBUG(10,("smbd_check_access_rights: root override "
  95                         "on %s. Granting 0x%x\n",
  96                         smb_fname_str_dbg(smb_fname),
  97                         (unsigned int)access_mask ));
  98                 return NT_STATUS_OK;
  99         }
 100
 101         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 102                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 103                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 104                         smb_fname_str_dbg(smb_fname),
 105                         (unsigned int)access_mask ));
 106                 return NT_STATUS_OK;
 107         }
 108
 109         if (access_mask == DELETE_ACCESS &&
 110                         VALID_STAT(smb_fname->st) &&
 111                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 112                 /* We can always delete a symlink. */
 113                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 114                         "on DELETE_ACCESS on symlink %s.\n",
 115                         smb_fname_str_dbg(smb_fname) ));
 116                 return NT_STATUS_OK;
 117         }
 118
 119         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
 120                         (SECINFO_OWNER |
 121                         SECINFO_GROUP |
 122                          SECINFO_DACL), talloc_tos(), &sd);
 123
 124         if (!NT_STATUS_IS_OK(status)) {
 125                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 126                         "on %s: %s\n",
 127                         smb_fname_str_dbg(smb_fname),
 128                         nt_errstr(status)));
 129
 130                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 131                         goto access_denied;
 132                 }
 133
 134                 return status;
 135         }
 136
 137         /*
 138          * If we can access the path to this file, by
 139          * default we have FILE_READ_ATTRIBUTES from the
 140          * containing directory. See the section:
 141          * "Algorithm to Check Access to an Existing File"
 142          * in MS-FSA.pdf.
 143          *
 144          * se_file_access_check() also takes care of
 145          * owner WRITE_DAC and READ_CONTROL.
 146          */
 147         do_not_check_mask = FILE_READ_ATTRIBUTES;
 148
 149         /*
 150          * Samba 3.6 and earlier granted execute access even
 151          * if the ACL did not contain execute rights.
 152          * Samba 4.0 is more correct and checks it.
 153          * The compatibilty mode allows to skip this check
 154          * to smoothen upgrades.
 155          */
 156         if (lp_acl_allow_execute_always(SNUM(conn))) {
 157                 do_not_check_mask |= FILE_EXECUTE;
 158         }
 159
 160         status = se_file_access_check(sd,
 161                                 get_current_nttok(conn),
 162                                 use_privs,
 163                                 (access_mask & ~do_not_check_mask),
 164                                 &rejected_mask);
 165
 166         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 167                 "0x%x returning 0x%x (%s)\n",
 168                 smb_fname_str_dbg(smb_fname),
 169                 (unsigned int)access_mask,
 170                 (unsigned int)rejected_mask,
 171                 nt_errstr(status) ));
 172
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 if (DEBUGLEVEL >= 10) {
 175                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 176                                 smb_fname_str_dbg(smb_fname) ));
 177                         NDR_PRINT_DEBUG(security_descriptor, sd);
 178                 }
 179         }
 180
 181         TALLOC_FREE(sd);
 182
 183         if (NT_STATUS_IS_OK(status) ||
 184                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 185                 return status;
 186         }
 187
 188         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 189
 190   access_denied:
 191
 192         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 193                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 194                         !lp_store_dos_attributes(SNUM(conn)) &&
 195                         (lp_map_readonly(SNUM(conn)) ||
 196                         lp_map_archive(SNUM(conn)) ||
 197                         lp_map_hidden(SNUM(conn)) ||
 198                         lp_map_system(SNUM(conn)))) {
 199                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 200
 201                 DEBUG(10,("smbd_check_access_rights: "
 202                         "overrode "
 203                         "FILE_WRITE_ATTRIBUTES "
 204                         "on file %s\n",
 205                         smb_fname_str_dbg(smb_fname)));
 206         }
 207
 208         if (parent_override_delete(conn,
 209                                 smb_fname,
 210                                 access_mask,
 211                                 rejected_mask)) {
 212                 /* Were we trying to do an open
 213                  * for delete and didn't get DELETE
 214                  * access (only) ? Check if the
 215                  * directory allows DELETE_CHILD.
 216                  * See here:
 217                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 218                  * for details. */
 219
 220                 rejected_mask &= ~DELETE_ACCESS;
 221
 222                 DEBUG(10,("smbd_check_access_rights: "
 223                         "overrode "
 224                         "DELETE_ACCESS on "
 225                         "file %s\n",
 226                         smb_fname_str_dbg(smb_fname)));
 227         }
 228
 229         if (rejected_mask != 0) {
 230                 return NT_STATUS_ACCESS_DENIED;
 231         }
 232         return NT_STATUS_OK;
 233 }
 234
 235 static NTSTATUS check_parent_access(struct connection_struct *conn,
 236                                 struct smb_filename *smb_fname,
 237                                 uint32_t access_mask)
 238 {
 239         NTSTATUS status;
 240         char *parent_dir = NULL;
 241         struct security_descriptor *parent_sd = NULL;
 242         uint32_t access_granted = 0;
 243
 244         if (!parent_dirname(talloc_tos(),
 245                                 smb_fname->base_name,
 246                                 &parent_dir,
 247                                 NULL)) {
 248                 return NT_STATUS_NO_MEMORY;
 249         }
 250
 251         if (get_current_uid(conn) == (uid_t)0) {
 252                 /* I'm sorry sir, I didn't know you were root... */
 253                 DEBUG(10,("check_parent_access: root override "
 254                         "on %s. Granting 0x%x\n",
 255                         smb_fname_str_dbg(smb_fname),
 256                         (unsigned int)access_mask ));
 257                 return NT_STATUS_OK;
 258         }
 259
 260         status = SMB_VFS_GET_NT_ACL(conn,
 261                                 parent_dir,
 262                                 SECINFO_DACL,
 263                                     talloc_tos(),
 264                                 &parent_sd);
 265
 266         if (!NT_STATUS_IS_OK(status)) {
 267                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 268                         "%s with error %s\n",
 269                         parent_dir,
 270                         nt_errstr(status)));
 271                 return status;
 272         }
 273
 274         /*
 275          * If we can access the path to this file, by
 276          * default we have FILE_READ_ATTRIBUTES from the
 277          * containing directory. See the section:
 278          * "Algorithm to Check Access to an Existing File"
 279          * in MS-FSA.pdf.
 280          *
 281          * se_file_access_check() also takes care of
 282          * owner WRITE_DAC and READ_CONTROL.
 283          */
 284         status = se_file_access_check(parent_sd,
 285                                 get_current_nttok(conn),
 286                                 false,
 287                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 288                                 &access_granted);
 289         if(!NT_STATUS_IS_OK(status)) {
 290                 DEBUG(5,("check_parent_access: access check "
 291                         "on directory %s for "
 292                         "path %s for mask 0x%x returned (0x%x) %s\n",
 293                         parent_dir,
 294                         smb_fname->base_name,
 295                         access_mask,
 296                         access_granted,
 297                         nt_errstr(status) ));
 298                 return status;
 299         }
 300
 301         return NT_STATUS_OK;
 302 }
 303
 304 /****************************************************************************
 305  fd support routines - attempt to do a dos_open.
 306 ****************************************************************************/
 307
 308 NTSTATUS fd_open(struct connection_struct *conn,
 309                  files_struct *fsp,
 310                  int flags,
 311                  mode_t mode)
 312 {
 313         struct smb_filename *smb_fname = fsp->fsp_name;
 314         NTSTATUS status = NT_STATUS_OK;
 315
 316 #ifdef O_NOFOLLOW
 317         /*
 318          * Never follow symlinks on a POSIX client. The
 319          * client should be doing this.
 320          */
 321
 322         if (fsp->posix_open || !lp_symlinks(SNUM(conn))) {
 323                 flags |= O_NOFOLLOW;
 324         }
 325 #endif
 326
 327         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 328         if (fsp->fh->fd == -1) {
 329                 int posix_errno = errno;
 330 #ifdef O_NOFOLLOW
 331 #if defined(ENOTSUP) && defined(OSF1)
 332                 /* handle special Tru64 errno */
 333                 if (errno == ENOTSUP) {
 334                         posix_errno = ELOOP;
 335                 }
 336 #endif /* ENOTSUP */
 337 #ifdef EFTYPE
 338                 /* fix broken NetBSD errno */
 339                 if (errno == EFTYPE) {
 340                         posix_errno = ELOOP;
 341                 }
 342 #endif /* EFTYPE */
 343                 /* fix broken FreeBSD errno */
 344                 if (errno == EMLINK) {
 345                         posix_errno = ELOOP;
 346                 }
 347 #endif /* O_NOFOLLOW */
 348                 status = map_nt_error_from_unix(posix_errno);
 349                 if (errno == EMFILE) {
 350                         static time_t last_warned = 0L;
 351
 352                         if (time((time_t *) NULL) > last_warned) {
 353                                 DEBUG(0,("Too many open files, unable "
 354                                         "to open more!  smbd's max "
 355                                         "open files = %d\n",
 356                                         lp_max_open_files()));
 357                                 last_warned = time((time_t *) NULL);
 358                         }
 359                 }
 360
 361         }
 362
 363         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 364                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 365                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 366
 367         return status;
 368 }
 369
 370 /****************************************************************************
 371  Close the file associated with a fsp.
 372 ****************************************************************************/
 373
 374 NTSTATUS fd_close(files_struct *fsp)
 375 {
 376         int ret;
 377
 378         if (fsp->dptr) {
 379                 dptr_CloseDir(fsp);
 380         }
 381         if (fsp->fh->fd == -1) {
 382                 return NT_STATUS_OK; /* What we used to call a stat open. */
 383         }
 384         if (fsp->fh->ref_count > 1) {
 385                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 386         }
 387
 388         ret = SMB_VFS_CLOSE(fsp);
 389         fsp->fh->fd = -1;
 390         if (ret == -1) {
 391                 return map_nt_error_from_unix(errno);
 392         }
 393         return NT_STATUS_OK;
 394 }
 395
 396 /****************************************************************************
 397  Change the ownership of a file to that of the parent directory.
 398  Do this by fd if possible.
 399 ****************************************************************************/
 400
 401 void change_file_owner_to_parent(connection_struct *conn,
 402                                         const char *inherit_from_dir,
 403                                         files_struct *fsp)
 404 {
 405         struct smb_filename *smb_fname_parent;
 406         int ret;
 407
 408         smb_fname_parent = synthetic_smb_fname(talloc_tos(), inherit_from_dir,
 409                                                NULL, NULL);
 410         if (smb_fname_parent == NULL) {
 411                 return;
 412         }
 413
 414         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 415         if (ret == -1) {
 416                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 417                          "directory %s. Error was %s\n",
 418                          smb_fname_str_dbg(smb_fname_parent),
 419                          strerror(errno)));
 420                 TALLOC_FREE(smb_fname_parent);
 421                 return;
 422         }
 423
 424         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 425                 /* Already this uid - no need to change. */
 426                 DEBUG(10,("change_file_owner_to_parent: file %s "
 427                         "is already owned by uid %d\n",
 428                         fsp_str_dbg(fsp),
 429                         (int)fsp->fsp_name->st.st_ex_uid ));
 430                 TALLOC_FREE(smb_fname_parent);
 431                 return;
 432         }
 433
 434         become_root();
 435         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 436         unbecome_root();
 437         if (ret == -1) {
 438                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 439                          "file %s to parent directory uid %u. Error "
 440                          "was %s\n", fsp_str_dbg(fsp),
 441                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 442                          strerror(errno) ));
 443         } else {
 444                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 445                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 446                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 447                 /* Ensure the uid entry is updated. */
 448                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 449         }
 450
 451         TALLOC_FREE(smb_fname_parent);
 452 }
 453
 454 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 455                                        const char *inherit_from_dir,
 456                                        const char *fname,
 457                                        SMB_STRUCT_STAT *psbuf)
 458 {
 459         struct smb_filename *smb_fname_parent;
 460         struct smb_filename *smb_fname_cwd = NULL;
 461         char *saved_dir = NULL;
 462         TALLOC_CTX *ctx = talloc_tos();
 463         NTSTATUS status = NT_STATUS_OK;
 464         int ret;
 465
 466         smb_fname_parent = synthetic_smb_fname(ctx, inherit_from_dir,
 467                                                NULL, NULL);
 468         if (smb_fname_parent == NULL) {
 469                 return NT_STATUS_NO_MEMORY;
 470         }
 471
 472         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 473         if (ret == -1) {
 474                 status = map_nt_error_from_unix(errno);
 475                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 476                          "directory %s. Error was %s\n",
 477                          smb_fname_str_dbg(smb_fname_parent),
 478                          strerror(errno)));
 479                 goto out;
 480         }
 481
 482         /* We've already done an lstat into psbuf, and we know it's a
 483            directory. If we can cd into the directory and the dev/ino
 484            are the same then we can safely chown without races as
 485            we're locking the directory in place by being in it.  This
 486            should work on any UNIX (thanks tridge :-). JRA.
 487         */
 488
 489         saved_dir = vfs_GetWd(ctx,conn);
 490         if (!saved_dir) {
 491                 status = map_nt_error_from_unix(errno);
 492                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 493                          "current working directory. Error was %s\n",
 494                          strerror(errno)));
 495                 goto out;
 496         }
 497
 498         /* Chdir into the new path. */
 499         if (vfs_ChDir(conn, fname) == -1) {
 500                 status = map_nt_error_from_unix(errno);
 501                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 502                          "current working directory to %s. Error "
 503                          "was %s\n", fname, strerror(errno) ));
 504                 goto chdir;
 505         }
 506
 507         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL);
 508         if (smb_fname_cwd == NULL) {
 509                 status = NT_STATUS_NO_MEMORY;
 510                 goto chdir;
 511         }
 512
 513         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 514         if (ret == -1) {
 515                 status = map_nt_error_from_unix(errno);
 516                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 517                          "directory '.' (%s) Error was %s\n",
 518                          fname, strerror(errno)));
 519                 goto chdir;
 520         }
 521
 522         /* Ensure we're pointing at the same place. */
 523         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 524             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 525                 DEBUG(0,("change_dir_owner_to_parent: "
 526                          "device/inode on directory %s changed. "
 527                          "Refusing to chown !\n", fname ));
 528                 status = NT_STATUS_ACCESS_DENIED;
 529                 goto chdir;
 530         }
 531
 532         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 533                 /* Already this uid - no need to change. */
 534                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 535                         "is already owned by uid %d\n",
 536                         fname,
 537                         (int)smb_fname_cwd->st.st_ex_uid ));
 538                 status = NT_STATUS_OK;
 539                 goto chdir;
 540         }
 541
 542         become_root();
 543         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
 544                             (gid_t)-1);
 545         unbecome_root();
 546         if (ret == -1) {
 547                 status = map_nt_error_from_unix(errno);
 548                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
 549                           "directory %s to parent directory uid %u. "
 550                           "Error was %s\n", fname,
 551                           (unsigned int)smb_fname_parent->st.st_ex_uid,
 552                           strerror(errno) ));
 553         } else {
 554                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
 555                         "directory %s to parent directory uid %u.\n",
 556                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
 557                 /* Ensure the uid entry is updated. */
 558                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
 559         }
 560
 561  chdir:
 562         vfs_ChDir(conn,saved_dir);
 563  out:
 564         TALLOC_FREE(smb_fname_parent);
 565         TALLOC_FREE(smb_fname_cwd);
 566         return status;
 567 }
 568
 569 /****************************************************************************
 570  Open a file - returning a guaranteed ATOMIC indication of if the
 571  file was created or not.
 572 ****************************************************************************/
 573
 574 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
 575                         files_struct *fsp,
 576                         int flags,
 577                         mode_t mode,
 578                         bool *file_created)
 579 {
 580         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 581         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 582
 583         *file_created = false;
 584
 585         if (!(flags & O_CREAT)) {
 586                 /*
 587                  * We're not creating the file, just pass through.
 588                  */
 589                 return fd_open(conn, fsp, flags, mode);
 590         }
 591
 592         if (flags & O_EXCL) {
 593                 /*
 594                  * Fail if already exists, just pass through.
 595                  */
 596                 status = fd_open(conn, fsp, flags, mode);
 597
 598                 /*
 599                  * Here we've opened with O_CREAT|O_EXCL. If that went
 600                  * NT_STATUS_OK, we *know* we created this file.
 601                  */
 602                 *file_created = NT_STATUS_IS_OK(status);
 603
 604                 return status;
 605         }
 606
 607         /*
 608          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
 609          * To know absolutely if we created the file or not,
 610          * we can never call O_CREAT without O_EXCL. So if
 611          * we think the file existed, try without O_CREAT|O_EXCL.
 612          * If we think the file didn't exist, try with
 613          * O_CREAT|O_EXCL. Keep bouncing between these two
 614          * requests until either the file is created, or
 615          * opened. Either way, we keep going until we get
 616          * a returnable result (error, or open/create).
 617          */
 618
 619         while(1) {
 620                 int curr_flags = flags;
 621
 622                 if (file_existed) {
 623                         /* Just try open, do not create. */
 624                         curr_flags &= ~(O_CREAT);
 625                         status = fd_open(conn, fsp, curr_flags, mode);
 626                         if (NT_STATUS_EQUAL(status,
 627                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 628                                 /*
 629                                  * Someone deleted it in the meantime.
 630                                  * Retry with O_EXCL.
 631                                  */
 632                                 file_existed = false;
 633                                 DEBUG(10,("fd_open_atomic: file %s existed. "
 634                                         "Retry.\n",
 635                                         smb_fname_str_dbg(fsp->fsp_name)));
 636                                         continue;
 637                         }
 638                 } else {
 639                         /* Try create exclusively, fail if it exists. */
 640                         curr_flags |= O_EXCL;
 641                         status = fd_open(conn, fsp, curr_flags, mode);
 642                         if (NT_STATUS_EQUAL(status,
 643                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
 644                                 /*
 645                                  * Someone created it in the meantime.
 646                                  * Retry without O_CREAT.
 647                                  */
 648                                 file_existed = true;
 649                                 DEBUG(10,("fd_open_atomic: file %s "
 650                                         "did not exist. Retry.\n",
 651                                         smb_fname_str_dbg(fsp->fsp_name)));
 652                                 continue;
 653                         }
 654                         if (NT_STATUS_IS_OK(status)) {
 655                                 /*
 656                                  * Here we've opened with O_CREAT|O_EXCL
 657                                  * and got success. We *know* we created
 658                                  * this file.
 659                                  */
 660                                 *file_created = true;
 661                         }
 662                 }
 663                 /* Create is done, or failed. */
 664                 break;
 665         }
 666         return status;
 667 }
 668
 669 /****************************************************************************
 670  Open a file.
 671 ****************************************************************************/
 672
 673 static NTSTATUS open_file(files_struct *fsp,
 674                           connection_struct *conn,
 675                           struct smb_request *req,
 676                           const char *parent_dir,
 677                           int flags,
 678                           mode_t unx_mode,
 679                           uint32 access_mask, /* client requested access mask. */
 680                           uint32 open_access_mask, /* what we're actually using in the open. */
 681                           bool *p_file_created)
 682 {
 683         struct smb_filename *smb_fname = fsp->fsp_name;
 684         NTSTATUS status = NT_STATUS_OK;
 685         int accmode = (flags & O_ACCMODE);
 686         int local_flags = flags;
 687         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 688
 689         fsp->fh->fd = -1;
 690         errno = EPERM;
 691
 692         /* Check permissions */
 693
 694         /*
 695          * This code was changed after seeing a client open request
 696          * containing the open mode of (DENY_WRITE/read-only) with
 697          * the 'create if not exist' bit set. The previous code
 698          * would fail to open the file read only on a read-only share
 699          * as it was checking the flags parameter  directly against O_RDONLY,
 700          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
 701          * JRA.
 702          */
 703
 704         if (!CAN_WRITE(conn)) {
 705                 /* It's a read-only share - fail if we wanted to write. */
 706                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
 707                         DEBUG(3,("Permission denied opening %s\n",
 708                                  smb_fname_str_dbg(smb_fname)));
 709                         return NT_STATUS_ACCESS_DENIED;
 710                 }
 711                 if (flags & O_CREAT) {
 712                         /* We don't want to write - but we must make sure that
 713                            O_CREAT doesn't create the file if we have write
 714                            access into the directory.
 715                         */
 716                         flags &= ~(O_CREAT|O_EXCL);
 717                         local_flags &= ~(O_CREAT|O_EXCL);
 718                 }
 719         }
 720
 721         /*
 722          * This little piece of insanity is inspired by the
 723          * fact that an NT client can open a file for O_RDONLY,
 724          * but set the create disposition to FILE_EXISTS_TRUNCATE.
 725          * If the client *can* write to the file, then it expects to
 726          * truncate the file, even though it is opening for readonly.
 727          * Quicken uses this stupid trick in backup file creation...
 728          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
 729          * for helping track this one down. It didn't bite us in 2.0.x
 730          * as we always opened files read-write in that release. JRA.
 731          */
 732
 733         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
 734                 DEBUG(10,("open_file: truncate requested on read-only open "
 735                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
 736                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
 737         }
 738
 739         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
 740             (!file_existed && (local_flags & O_CREAT)) ||
 741             ((local_flags & O_TRUNC) == O_TRUNC) ) {
 742                 const char *wild;
 743                 int ret;
 744
 745 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
 746                 /*
 747                  * We would block on opening a FIFO with no one else on the
 748                  * other end. Do what we used to do and add O_NONBLOCK to the
 749                  * open flags. JRA.
 750                  */
 751
 752                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
 753                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
 754                         local_flags |= O_NONBLOCK;
 755                 }
 756 #endif
 757
 758                 /* Don't create files with Microsoft wildcard characters. */
 759                 if (fsp->base_fsp) {
 760                         /*
 761                          * wildcard characters are allowed in stream names
 762                          * only test the basefilename
 763                          */
 764                         wild = fsp->base_fsp->fsp_name->base_name;
 765                 } else {
 766                         wild = smb_fname->base_name;
 767                 }
 768                 if ((local_flags & O_CREAT) && !file_existed &&
 769                     ms_has_wild(wild))  {
 770                         return NT_STATUS_OBJECT_NAME_INVALID;
 771                 }
 772
 773                 /* Can we access this file ? */
 774                 if (!fsp->base_fsp) {
 775                         /* Only do this check on non-stream open. */
 776                         if (file_existed) {
 777                                 status = smbd_check_access_rights(conn,
 778                                                 smb_fname,
 779                                                 false,
 780                                                 access_mask);
 781                         } else if (local_flags & O_CREAT){
 782                                 status = check_parent_access(conn,
 783                                                 smb_fname,
 784                                                 SEC_DIR_ADD_FILE);
 785                         } else {
 786                                 /* File didn't exist and no O_CREAT. */
 787                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 788                         }
 789                         if (!NT_STATUS_IS_OK(status)) {
 790                                 DEBUG(10,("open_file: "
 791                                         "%s on file "
 792                                         "%s returned %s\n",
 793                                         file_existed ?
 794                                                 "smbd_check_access_rights" :
 795                                                 "check_parent_access",
 796                                         smb_fname_str_dbg(smb_fname),
 797                                         nt_errstr(status) ));
 798                                 return status;
 799                         }
 800                 }
 801
 802                 /* Actually do the open */
 803                 status = fd_open_atomic(conn, fsp, local_flags,
 804                                 unx_mode, p_file_created);
 805                 if (!NT_STATUS_IS_OK(status)) {
 806                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
 807                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
 808                                  nt_errstr(status),local_flags,flags));
 809                         return status;
 810                 }
 811
 812                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 813                 if (ret == -1) {
 814                         /* If we have an fd, this stat should succeed. */
 815                         DEBUG(0,("Error doing fstat on open file %s "
 816                                 "(%s)\n",
 817                                 smb_fname_str_dbg(smb_fname),
 818                                 strerror(errno) ));
 819                         status = map_nt_error_from_unix(errno);
 820                         fd_close(fsp);
 821                         return status;
 822                 }
 823
 824                 if (*p_file_created) {
 825                         /* We created this file. */
 826
 827                         bool need_re_stat = false;
 828                         /* Do all inheritance work after we've
 829                            done a successful fstat call and filled
 830                            in the stat struct in fsp->fsp_name. */
 831
 832                         /* Inherit the ACL if required */
 833                         if (lp_inherit_perms(SNUM(conn))) {
 834                                 inherit_access_posix_acl(conn, parent_dir,
 835                                                          smb_fname->base_name,
 836                                                          unx_mode);
 837                                 need_re_stat = true;
 838                         }
 839
 840                         /* Change the owner if required. */
 841                         if (lp_inherit_owner(SNUM(conn))) {
 842                                 change_file_owner_to_parent(conn, parent_dir,
 843                                                             fsp);
 844                                 need_re_stat = true;
 845                         }
 846
 847                         if (need_re_stat) {
 848                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 849                                 /* If we have an fd, this stat should succeed. */
 850                                 if (ret == -1) {
 851                                         DEBUG(0,("Error doing fstat on open file %s "
 852                                                  "(%s)\n",
 853                                                  smb_fname_str_dbg(smb_fname),
 854                                                  strerror(errno) ));
 855                                 }
 856                         }
 857
 858                         notify_fname(conn, NOTIFY_ACTION_ADDED,
 859                                      FILE_NOTIFY_CHANGE_FILE_NAME,
 860                                      smb_fname->base_name);
 861                 }
 862         } else {
 863                 fsp->fh->fd = -1; /* What we used to call a stat open. */
 864                 if (!file_existed) {
 865                         /* File must exist for a stat open. */
 866                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 867                 }
 868
 869                 status = smbd_check_access_rights(conn,
 870                                 smb_fname,
 871                                 false,
 872                                 access_mask);
 873
 874                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 875                                 fsp->posix_open &&
 876                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
 877                         /* This is a POSIX stat open for delete
 878                          * or rename on a symlink that points
 879                          * nowhere. Allow. */
 880                         DEBUG(10,("open_file: allowing POSIX "
 881                                   "open on bad symlink %s\n",
 882                                   smb_fname_str_dbg(smb_fname)));
 883                         status = NT_STATUS_OK;
 884                 }
 885
 886                 if (!NT_STATUS_IS_OK(status)) {
 887                         DEBUG(10,("open_file: "
 888                                 "smbd_check_access_rights on file "
 889                                 "%s returned %s\n",
 890                                 smb_fname_str_dbg(smb_fname),
 891                                 nt_errstr(status) ));
 892                         return status;
 893                 }
 894         }
 895
 896         /*
 897          * POSIX allows read-only opens of directories. We don't
 898          * want to do this (we use a different code path for this)
 899          * so catch a directory open and return an EISDIR. JRA.
 900          */
 901
 902         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
 903                 fd_close(fsp);
 904                 errno = EISDIR;
 905                 return NT_STATUS_FILE_IS_A_DIRECTORY;
 906         }
 907
 908         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 909         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
 910         fsp->file_pid = req ? req->smbpid : 0;
 911         fsp->can_lock = True;
 912         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
 913         fsp->can_write =
 914                 CAN_WRITE(conn) &&
 915                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
 916         fsp->print_file = NULL;
 917         fsp->modified = False;
 918         fsp->sent_oplock_break = NO_BREAK_SENT;
 919         fsp->is_directory = False;
 920         if (conn->aio_write_behind_list &&
 921             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
 922                        conn->case_sensitive)) {
 923                 fsp->aio_write_behind = True;
 924         }
 925
 926         fsp->wcp = NULL; /* Write cache pointer. */
 927
 928         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
 929                  conn->session_info->unix_info->unix_name,
 930                  smb_fname_str_dbg(smb_fname),
 931                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
 932                  conn->num_files_open));
 933
 934         errno = 0;
 935         return NT_STATUS_OK;
 936 }
 937
 938 /****************************************************************************
 939  Check if we can open a file with a share mode.
 940  Returns True if conflict, False if not.
 941 ****************************************************************************/
 942
 943 static bool share_conflict(struct share_mode_entry *entry,
 944                            uint32 access_mask,
 945                            uint32 share_access)
 946 {
 947         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
 948                   "entry->share_access = 0x%x, "
 949                   "entry->private_options = 0x%x\n",
 950                   (unsigned int)entry->access_mask,
 951                   (unsigned int)entry->share_access,
 952                   (unsigned int)entry->private_options));
 953
 954         if (server_id_is_disconnected(&entry->pid)) {
 955                 /*
 956                  * note: cleanup should have been done by
 957                  * delay_for_batch_oplocks()
 958                  */
 959                 return false;
 960         }
 961
 962         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
 963                   (unsigned int)access_mask, (unsigned int)share_access));
 964
 965         if ((entry->access_mask & (FILE_WRITE_DATA|
 966                                    FILE_APPEND_DATA|
 967                                    FILE_READ_DATA|
 968                                    FILE_EXECUTE|
 969                                    DELETE_ACCESS)) == 0) {
 970                 DEBUG(10,("share_conflict: No conflict due to "
 971                           "entry->access_mask = 0x%x\n",
 972                           (unsigned int)entry->access_mask ));
 973                 return False;
 974         }
 975
 976         if ((access_mask & (FILE_WRITE_DATA|
 977                             FILE_APPEND_DATA|
 978                             FILE_READ_DATA|
 979                             FILE_EXECUTE|
 980                             DELETE_ACCESS)) == 0) {
 981                 DEBUG(10,("share_conflict: No conflict due to "
 982                           "access_mask = 0x%x\n",
 983                           (unsigned int)access_mask ));
 984                 return False;
 985         }
 986
 987 #if 1 /* JRA TEST - Superdebug. */
 988 #define CHECK_MASK(num, am, right, sa, share) \
 989         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
 990                 (unsigned int)(num), (unsigned int)(am), \
 991                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
 992         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
 993                 (unsigned int)(num), (unsigned int)(sa), \
 994                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
 995         if (((am) & (right)) && !((sa) & (share))) { \
 996                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
 997 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
 998                         (unsigned int)(share) )); \
 999                 return True; \
1000         }
1001 #else
1002 #define CHECK_MASK(num, am, right, sa, share) \
1003         if (((am) & (right)) && !((sa) & (share))) { \
1004                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
1005 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
1006                         (unsigned int)(share) )); \
1007                 return True; \
1008         }
1009 #endif
1010
1011         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1012                    share_access, FILE_SHARE_WRITE);
1013         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
1014                    entry->share_access, FILE_SHARE_WRITE);
1015
1016         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1017                    share_access, FILE_SHARE_READ);
1018         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1019                    entry->share_access, FILE_SHARE_READ);
1020
1021         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1022                    share_access, FILE_SHARE_DELETE);
1023         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1024                    entry->share_access, FILE_SHARE_DELETE);
1025
1026         DEBUG(10,("share_conflict: No conflict.\n"));
1027         return False;
1028 }
1029
1030 #if defined(DEVELOPER)
1031 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1032                                       int num,
1033                                       struct share_mode_entry *share_entry)
1034 {
1035         struct server_id self = messaging_server_id(sconn->msg_ctx);
1036         files_struct *fsp;
1037
1038         if (!serverid_equal(&self, &share_entry->pid)) {
1039                 return;
1040         }
1041
1042         if (!is_valid_share_mode_entry(share_entry)) {
1043                 return;
1044         }
1045
1046         fsp = file_find_dif(sconn, share_entry->id,
1047                             share_entry->share_file_id);
1048         if (!fsp) {
1049                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1050                          share_mode_str(talloc_tos(), num, share_entry) ));
1051                 smb_panic("validate_my_share_entries: Cannot match a "
1052                           "share entry with an open file\n");
1053         }
1054
1055         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1056                 goto panic;
1057         }
1058
1059         return;
1060
1061  panic:
1062         {
1063                 char *str;
1064                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1065                          share_mode_str(talloc_tos(), num, share_entry) ));
1066                 str = talloc_asprintf(talloc_tos(),
1067                         "validate_my_share_entries: "
1068                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1069                          fsp->fsp_name->base_name,
1070                          (unsigned int)fsp->oplock_type,
1071                          (unsigned int)share_entry->op_type );
1072                 smb_panic(str);
1073         }
1074 }
1075 #endif
1076
1077 bool is_stat_open(uint32 access_mask)
1078 {
1079         const uint32_t stat_open_bits =
1080                 (SYNCHRONIZE_ACCESS|
1081                  FILE_READ_ATTRIBUTES|
1082                  FILE_WRITE_ATTRIBUTES);
1083
1084         return (((access_mask &  stat_open_bits) != 0) &&
1085                 ((access_mask & ~stat_open_bits) == 0));
1086 }
1087
1088 static bool has_delete_on_close(struct share_mode_lock *lck,
1089                                 uint32_t name_hash)
1090 {
1091         struct share_mode_data *d = lck->data;
1092         uint32_t i;
1093
1094         if (d->num_share_modes == 0) {
1095                 return false;
1096         }
1097         if (!is_delete_on_close_set(lck, name_hash)) {
1098                 return false;
1099         }
1100         for (i=0; i<d->num_share_modes; i++) {
1101                 if (!share_mode_stale_pid(d, i)) {
1102                         return true;
1103                 }
1104         }
1105         return false;
1106 }
1107
1108 /****************************************************************************
1109  Deal with share modes
1110  Invarient: Share mode must be locked on entry and exit.
1111  Returns -1 on error, or number of share modes on success (may be zero).
1112 ****************************************************************************/
1113
1114 static NTSTATUS open_mode_check(connection_struct *conn,
1115                                 struct share_mode_lock *lck,
1116                                 uint32 access_mask,
1117                                 uint32 share_access)
1118 {
1119         int i;
1120
1121         if(lck->data->num_share_modes == 0) {
1122                 return NT_STATUS_OK;
1123         }
1124
1125         if (is_stat_open(access_mask)) {
1126                 /* Stat open that doesn't trigger oplock breaks or share mode
1127                  * checks... ! JRA. */
1128                 return NT_STATUS_OK;
1129         }
1130
1131         /*
1132          * Check if the share modes will give us access.
1133          */
1134
1135 #if defined(DEVELOPER)
1136         for(i = 0; i < lck->data->num_share_modes; i++) {
1137                 validate_my_share_entries(conn->sconn, i,
1138                                           &lck->data->share_modes[i]);
1139         }
1140 #endif
1141
1142         /* Now we check the share modes, after any oplock breaks. */
1143         for(i = 0; i < lck->data->num_share_modes; i++) {
1144
1145                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1146                         continue;
1147                 }
1148
1149                 /* someone else has a share lock on it, check to see if we can
1150                  * too */
1151                 if (share_conflict(&lck->data->share_modes[i],
1152                                    access_mask, share_access)) {
1153
1154                         if (share_mode_stale_pid(lck->data, i)) {
1155                                 continue;
1156                         }
1157
1158                         return NT_STATUS_SHARING_VIOLATION;
1159                 }
1160         }
1161
1162         return NT_STATUS_OK;
1163 }
1164
1165 /*
1166  * Send a break message to the oplock holder and delay the open for
1167  * our client.
1168  */
1169
1170 static NTSTATUS send_break_message(struct messaging_context *msg_ctx,
1171                                    const struct share_mode_entry *exclusive,
1172                                    uint16_t break_to)
1173 {
1174         NTSTATUS status;
1175         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1176
1177         DEBUG(10, ("Sending break request to PID %s\n",
1178                    procid_str_static(&exclusive->pid)));
1179
1180         /* Create the message. */
1181         share_mode_entry_to_message(msg, exclusive);
1182
1183         /* Overload entry->op_type */
1184         SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, break_to);
1185
1186         status = messaging_send_buf(msg_ctx, exclusive->pid,
1187                                     MSG_SMB_BREAK_REQUEST,
1188                                     (uint8 *)msg, sizeof(msg));
1189         if (!NT_STATUS_IS_OK(status)) {
1190                 DEBUG(3, ("Could not send oplock break message: %s\n",
1191                           nt_errstr(status)));
1192         }
1193
1194         return status;
1195 }
1196
1197 /*
1198  * Do internal consistency checks on the share mode for a file.
1199  */
1200
1201 static bool validate_oplock_types(struct share_mode_lock *lck)
1202 {
1203         struct share_mode_data *d = lck->data;
1204         bool batch = false;
1205         bool ex_or_batch = false;
1206         bool level2 = false;
1207         bool no_oplock = false;
1208         uint32_t num_non_stat_opens = 0;
1209         uint32_t i;
1210
1211         for (i=0; i<d->num_share_modes; i++) {
1212                 struct share_mode_entry *e = &d->share_modes[i];
1213
1214                 if (!is_valid_share_mode_entry(e)) {
1215                         continue;
1216                 }
1217
1218                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1219                         /* We ignore stat opens in the table - they
1220                            always have NO_OPLOCK and never get or
1221                            cause breaks. JRA. */
1222                         continue;
1223                 }
1224
1225                 num_non_stat_opens += 1;
1226
1227                 if (BATCH_OPLOCK_TYPE(e->op_type)) {
1228                         /* batch - can only be one. */
1229                         if (share_mode_stale_pid(d, i)) {
1230                                 DEBUG(10, ("Found stale batch oplock\n"));
1231                                 continue;
1232                         }
1233                         if (ex_or_batch || batch || level2 || no_oplock) {
1234                                 DEBUG(0, ("Bad batch oplock entry %u.",
1235                                           (unsigned)i));
1236                                 return false;
1237                         }
1238                         batch = true;
1239                 }
1240
1241                 if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
1242                         if (share_mode_stale_pid(d, i)) {
1243                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1244                                 continue;
1245                         }
1246                         /* Exclusive or batch - can only be one. */
1247                         if (ex_or_batch || level2 || no_oplock) {
1248                                 DEBUG(0, ("Bad exclusive or batch oplock "
1249                                           "entry %u.", (unsigned)i));
1250                                 return false;
1251                         }
1252                         ex_or_batch = true;
1253                 }
1254
1255                 if (LEVEL_II_OPLOCK_TYPE(e->op_type)) {
1256                         if (batch || ex_or_batch) {
1257                                 if (share_mode_stale_pid(d, i)) {
1258                                         DEBUG(10, ("Found stale LevelII "
1259                                                    "oplock\n"));
1260                                         continue;
1261                                 }
1262                                 DEBUG(0, ("Bad levelII oplock entry %u.",
1263                                           (unsigned)i));
1264                                 return false;
1265                         }
1266                         level2 = true;
1267                 }
1268
1269                 if (e->op_type == NO_OPLOCK) {
1270                         if (batch || ex_or_batch) {
1271                                 if (share_mode_stale_pid(d, i)) {
1272                                         DEBUG(10, ("Found stale NO_OPLOCK "
1273                                                    "entry\n"));
1274                                         continue;
1275                                 }
1276                                 DEBUG(0, ("Bad no oplock entry %u.",
1277                                           (unsigned)i));
1278                                 return false;
1279                         }
1280                         no_oplock = true;
1281                 }
1282         }
1283
1284         remove_stale_share_mode_entries(d);
1285
1286         if ((batch || ex_or_batch) && (num_non_stat_opens != 1)) {
1287                 DEBUG(1, ("got batch (%d) or ex (%d) non-exclusively (%d)\n",
1288                           (int)batch, (int)ex_or_batch,
1289                           (int)d->num_share_modes));
1290                 return false;
1291         }
1292
1293         return true;
1294 }
1295
1296 static bool delay_for_oplock(files_struct *fsp,
1297                              int oplock_request,
1298                              struct share_mode_lock *lck,
1299                              bool have_sharing_violation,
1300                              uint32_t create_disposition)
1301 {
1302         struct share_mode_data *d = lck->data;
1303         struct share_mode_entry *entry;
1304         uint32_t num_non_stat_opens = 0;
1305         uint32_t i;
1306         uint16_t break_to;
1307
1308         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1309                 return false;
1310         }
1311         for (i=0; i<d->num_share_modes; i++) {
1312                 struct share_mode_entry *e = &d->share_modes[i];
1313                 if (e->op_type == NO_OPLOCK && is_stat_open(e->access_mask)) {
1314                         continue;
1315                 }
1316                 num_non_stat_opens += 1;
1317
1318                 /*
1319                  * We found the a non-stat open, which in the exclusive/batch
1320                  * case will be inspected further down.
1321                  */
1322                 entry = e;
1323         }
1324         if (num_non_stat_opens == 0) {
1325                 /*
1326                  * Nothing to wait for around
1327                  */
1328                 return false;
1329         }
1330         if (num_non_stat_opens != 1) {
1331                 /*
1332                  * More than one open around. There can't be any exclusive or
1333                  * batch left, this is all level2.
1334                  */
1335                 return false;
1336         }
1337
1338         if (server_id_is_disconnected(&entry->pid)) {
1339                 /*
1340                  * TODO: clean up.
1341                  * This could be achieved by sending a break message
1342                  * to ourselves. Special considerations for files
1343                  * with delete_on_close flag set!
1344                  *
1345                  * For now we keep it simple and do not
1346                  * allow delete on close for durable handles.
1347                  */
1348                 return false;
1349         }
1350
1351         switch (create_disposition) {
1352         case FILE_SUPERSEDE:
1353         case FILE_OVERWRITE_IF:
1354                 break_to = NO_OPLOCK;
1355                 break;
1356         default:
1357                 break_to = LEVEL_II_OPLOCK;
1358                 break;
1359         }
1360
1361         if (have_sharing_violation && (entry->op_type & BATCH_OPLOCK)) {
1362                 if (share_mode_stale_pid(d, 0)) {
1363                         return false;
1364                 }
1365                 send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1366                 return true;
1367         }
1368         if (have_sharing_violation) {
1369                 /*
1370                  * Non-batch exclusive is not broken if we have a sharing
1371                  * violation
1372                  */
1373                 return false;
1374         }
1375         if (LEVEL_II_OPLOCK_TYPE(entry->op_type) &&
1376             (break_to == NO_OPLOCK)) {
1377                 if (share_mode_stale_pid(d, 0)) {
1378                         return false;
1379                 }
1380                 DEBUG(10, ("Asynchronously breaking level2 oplock for "
1381                            "create_disposition=%u\n",
1382                            (unsigned)create_disposition));
1383                 send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1384                 return false;
1385         }
1386         if (!EXCLUSIVE_OPLOCK_TYPE(entry->op_type)) {
1387                 /*
1388                  * No break for NO_OPLOCK or LEVEL2_OPLOCK oplocks
1389                  */
1390                 return false;
1391         }
1392         if (share_mode_stale_pid(d, 0)) {
1393                 return false;
1394         }
1395
1396         send_break_message(fsp->conn->sconn->msg_ctx, entry, break_to);
1397         return true;
1398 }
1399
1400 static bool file_has_brlocks(files_struct *fsp)
1401 {
1402         struct byte_range_lock *br_lck;
1403
1404         br_lck = brl_get_locks_readonly(fsp);
1405         if (!br_lck)
1406                 return false;
1407
1408         return (brl_num_locks(br_lck) > 0);
1409 }
1410
1411 static void grant_fsp_oplock_type(files_struct *fsp,
1412                                   struct share_mode_lock *lck,
1413                                   int oplock_request)
1414 {
1415         bool allow_level2 = (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1416                             lp_level2_oplocks(SNUM(fsp->conn));
1417         bool got_level2_oplock, got_a_none_oplock;
1418         uint32_t i;
1419
1420         /* Start by granting what the client asked for,
1421            but ensure no SAMBA_PRIVATE bits can be set. */
1422         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1423
1424         if (oplock_request & INTERNAL_OPEN_ONLY) {
1425                 /* No oplocks on internal open. */
1426                 fsp->oplock_type = NO_OPLOCK;
1427                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1428                         fsp->oplock_type, fsp_str_dbg(fsp)));
1429                 return;
1430         }
1431
1432         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1433                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1434                         fsp_str_dbg(fsp)));
1435                 fsp->oplock_type = NO_OPLOCK;
1436         }
1437
1438         if (is_stat_open(fsp->access_mask)) {
1439                 /* Leave the value already set. */
1440                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1441                         fsp->oplock_type, fsp_str_dbg(fsp)));
1442                 return;
1443         }
1444
1445         got_level2_oplock = false;
1446         got_a_none_oplock = false;
1447
1448         for (i=0; i<lck->data->num_share_modes; i++) {
1449                 int op_type = lck->data->share_modes[i].op_type;
1450
1451                 if (LEVEL_II_OPLOCK_TYPE(op_type)) {
1452                         got_level2_oplock = true;
1453                 }
1454                 if (op_type == NO_OPLOCK) {
1455                         got_a_none_oplock = true;
1456                 }
1457         }
1458
1459         /*
1460          * Match what was requested (fsp->oplock_type) with
1461          * what was found in the existing share modes.
1462          */
1463
1464         if (got_level2_oplock || got_a_none_oplock) {
1465                 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
1466                         fsp->oplock_type = LEVEL_II_OPLOCK;
1467                 }
1468         }
1469
1470         /*
1471          * Don't grant level2 to clients that don't want them
1472          * or if we've turned them off.
1473          */
1474         if (fsp->oplock_type == LEVEL_II_OPLOCK && !allow_level2) {
1475                 fsp->oplock_type = NO_OPLOCK;
1476         }
1477
1478         if (fsp->oplock_type == LEVEL_II_OPLOCK && !got_level2_oplock) {
1479                 /*
1480                  * We're the first level2 oplock. Indicate that in brlock.tdb.
1481                  */
1482                 struct byte_range_lock *brl;
1483
1484                 brl = brl_get_locks(talloc_tos(), fsp);
1485                 if (brl != NULL) {
1486                         brl_set_have_read_oplocks(brl, true);
1487                         TALLOC_FREE(brl);
1488                 }
1489         }
1490
1491         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1492                   fsp->oplock_type, fsp_str_dbg(fsp)));
1493 }
1494
1495 static bool request_timed_out(struct timeval request_time,
1496                               struct timeval timeout)
1497 {
1498         struct timeval now, end_time;
1499         GetTimeOfDay(&now);
1500         end_time = timeval_sum(&request_time, &timeout);
1501         return (timeval_compare(&end_time, &now) < 0);
1502 }
1503
1504 struct defer_open_state {
1505         struct smbd_server_connection *sconn;
1506         uint64_t mid;
1507 };
1508
1509 static void defer_open_done(struct tevent_req *req);
1510
1511 /****************************************************************************
1512  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1513 ****************************************************************************/
1514
1515 static void defer_open(struct share_mode_lock *lck,
1516                        struct timeval request_time,
1517                        struct timeval timeout,
1518                        struct smb_request *req,
1519                        struct deferred_open_record *state)
1520 {
1521         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1522                   "open entry for mid %llu\n",
1523                   (unsigned int)request_time.tv_sec,
1524                   (unsigned int)request_time.tv_usec,
1525                   (unsigned long long)req->mid));
1526
1527         if (!push_deferred_open_message_smb(req, request_time, timeout,
1528                                        state->id, (char *)state, sizeof(*state))) {
1529                 TALLOC_FREE(lck);
1530                 exit_server("push_deferred_open_message_smb failed");
1531         }
1532         if (lck) {
1533                 struct defer_open_state *watch_state;
1534                 struct tevent_req *watch_req;
1535                 bool ret;
1536
1537                 watch_state = talloc(req->sconn, struct defer_open_state);
1538                 if (watch_state == NULL) {
1539                         exit_server("talloc failed");
1540                 }
1541                 watch_state->sconn = req->sconn;
1542                 watch_state->mid = req->mid;
1543
1544                 DEBUG(10, ("defering mid %llu\n",
1545                            (unsigned long long)req->mid));
1546
1547                 watch_req = dbwrap_record_watch_send(
1548                         watch_state, req->sconn->ev_ctx, lck->data->record,
1549                         req->sconn->msg_ctx);
1550                 if (watch_req == NULL) {
1551                         exit_server("Could not watch share mode record");
1552                 }
1553                 tevent_req_set_callback(watch_req, defer_open_done,
1554                                         watch_state);
1555
1556                 ret = tevent_req_set_endtime(
1557                         watch_req, req->sconn->ev_ctx,
1558                         timeval_sum(&request_time, &timeout));
1559                 SMB_ASSERT(ret);
1560         }
1561 }
1562
1563 static void defer_open_done(struct tevent_req *req)
1564 {
1565         struct defer_open_state *state = tevent_req_callback_data(
1566                 req, struct defer_open_state);
1567         NTSTATUS status;
1568         bool ret;
1569
1570         status = dbwrap_record_watch_recv(req, talloc_tos(), NULL);
1571         TALLOC_FREE(req);
1572         if (!NT_STATUS_IS_OK(status)) {
1573                 DEBUG(5, ("dbwrap_record_watch_recv returned %s\n",
1574                           nt_errstr(status)));
1575                 /*
1576                  * Even if it failed, retry anyway. TODO: We need a way to
1577                  * tell a re-scheduled open about that error.
1578                  */
1579         }
1580
1581         DEBUG(10, ("scheduling mid %llu\n", (unsigned long long)state->mid));
1582
1583         ret = schedule_deferred_open_message_smb(state->sconn, state->mid);
1584         SMB_ASSERT(ret);
1585         TALLOC_FREE(state);
1586 }
1587
1588
1589 /****************************************************************************
1590  On overwrite open ensure that the attributes match.
1591 ****************************************************************************/
1592
1593 static bool open_match_attributes(connection_struct *conn,
1594                                   uint32 old_dos_attr,
1595                                   uint32 new_dos_attr,
1596                                   mode_t existing_unx_mode,
1597                                   mode_t new_unx_mode,
1598                                   mode_t *returned_unx_mode)
1599 {
1600         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1601
1602         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1603         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1604
1605         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
1606            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
1607                 *returned_unx_mode = new_unx_mode;
1608         } else {
1609                 *returned_unx_mode = (mode_t)0;
1610         }
1611
1612         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
1613                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
1614                   "returned_unx_mode = 0%o\n",
1615                   (unsigned int)old_dos_attr,
1616                   (unsigned int)existing_unx_mode,
1617                   (unsigned int)new_dos_attr,
1618                   (unsigned int)*returned_unx_mode ));
1619
1620         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
1621         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1622                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
1623                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
1624                         return False;
1625                 }
1626         }
1627         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1628                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
1629                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
1630                         return False;
1631                 }
1632         }
1633         return True;
1634 }
1635
1636 /****************************************************************************
1637  Special FCB or DOS processing in the case of a sharing violation.
1638  Try and find a duplicated file handle.
1639 ****************************************************************************/
1640
1641 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
1642                                 connection_struct *conn,
1643                                 files_struct *fsp_to_dup_into,
1644                                 const struct smb_filename *smb_fname,
1645                                 struct file_id id,
1646                                 uint16 file_pid,
1647                                 uint64_t vuid,
1648                                 uint32 access_mask,
1649                                 uint32 share_access,
1650                                 uint32 create_options)
1651 {
1652         files_struct *fsp;
1653
1654         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
1655                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
1656
1657         for(fsp = file_find_di_first(conn->sconn, id); fsp;
1658             fsp = file_find_di_next(fsp)) {
1659
1660                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
1661                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
1662                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
1663                           fsp->fh->fd, (unsigned long long)fsp->vuid,
1664                           (unsigned int)fsp->file_pid,
1665                           (unsigned int)fsp->fh->private_options,
1666                           (unsigned int)fsp->access_mask ));
1667
1668                 if (fsp != fsp_to_dup_into &&
1669                     fsp->fh->fd != -1 &&
1670                     fsp->vuid == vuid &&
1671                     fsp->file_pid == file_pid &&
1672                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
1673                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
1674                     (fsp->access_mask & FILE_WRITE_DATA) &&
1675                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
1676                     strequal(fsp->fsp_name->stream_name,
1677                              smb_fname->stream_name)) {
1678                         DEBUG(10,("fcb_or_dos_open: file match\n"));
1679                         break;
1680                 }
1681         }
1682
1683         if (!fsp) {
1684                 return NT_STATUS_NOT_FOUND;
1685         }
1686
1687         /* quite an insane set of semantics ... */
1688         if (is_executable(smb_fname->base_name) &&
1689             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
1690                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
1691                 return NT_STATUS_INVALID_PARAMETER;
1692         }
1693
1694         /* We need to duplicate this fsp. */
1695         return dup_file_fsp(req, fsp, access_mask, share_access,
1696                             create_options, fsp_to_dup_into);
1697 }
1698
1699 static void schedule_defer_open(struct share_mode_lock *lck,
1700                                 struct timeval request_time,
1701                                 struct smb_request *req)
1702 {
1703         struct deferred_open_record state;
1704
1705         /* This is a relative time, added to the absolute
1706            request_time value to get the absolute timeout time.
1707            Note that if this is the second or greater time we enter
1708            this codepath for this particular request mid then
1709            request_time is left as the absolute time of the *first*
1710            time this request mid was processed. This is what allows
1711            the request to eventually time out. */
1712
1713         struct timeval timeout;
1714
1715         /* Normally the smbd we asked should respond within
1716          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
1717          * the client did, give twice the timeout as a safety
1718          * measure here in case the other smbd is stuck
1719          * somewhere else. */
1720
1721         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
1722
1723         /* Nothing actually uses state.delayed_for_oplocks
1724            but it's handy to differentiate in debug messages
1725            between a 30 second delay due to oplock break, and
1726            a 1 second delay for share mode conflicts. */
1727
1728         state.delayed_for_oplocks = True;
1729         state.async_open = false;
1730         state.id = lck->data->id;
1731
1732         if (!request_timed_out(request_time, timeout)) {
1733                 defer_open(lck, request_time, timeout, req, &state);
1734         }
1735 }
1736
1737 /****************************************************************************
1738  Reschedule an open call that went asynchronous.
1739 ****************************************************************************/
1740
1741 static void schedule_async_open(struct timeval request_time,
1742                                 struct smb_request *req)
1743 {
1744         struct deferred_open_record state;
1745         struct timeval timeout;
1746
1747         timeout = timeval_set(20, 0);
1748
1749         ZERO_STRUCT(state);
1750         state.delayed_for_oplocks = false;
1751         state.async_open = true;
1752
1753         if (!request_timed_out(request_time, timeout)) {
1754                 defer_open(NULL, request_time, timeout, req, &state);
1755         }
1756 }
1757
1758 /****************************************************************************
1759  Work out what access_mask to use from what the client sent us.
1760 ****************************************************************************/
1761
1762 static NTSTATUS smbd_calculate_maximum_allowed_access(
1763         connection_struct *conn,
1764         const struct smb_filename *smb_fname,
1765         bool use_privs,
1766         uint32_t *p_access_mask)
1767 {
1768         struct security_descriptor *sd;
1769         uint32_t access_granted;
1770         NTSTATUS status;
1771
1772         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
1773                 *p_access_mask |= FILE_GENERIC_ALL;
1774                 return NT_STATUS_OK;
1775         }
1776
1777         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
1778                                     (SECINFO_OWNER |
1779                                      SECINFO_GROUP |
1780                                      SECINFO_DACL),
1781                                     talloc_tos(), &sd);
1782
1783         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1784                 /*
1785                  * File did not exist
1786                  */
1787                 *p_access_mask = FILE_GENERIC_ALL;
1788                 return NT_STATUS_OK;
1789         }
1790         if (!NT_STATUS_IS_OK(status)) {
1791                 DEBUG(10,("Could not get acl on file %s: %s\n",
1792                           smb_fname_str_dbg(smb_fname),
1793                           nt_errstr(status)));
1794                 return NT_STATUS_ACCESS_DENIED;
1795         }
1796
1797         /*
1798          * If we can access the path to this file, by
1799          * default we have FILE_READ_ATTRIBUTES from the
1800          * containing directory. See the section:
1801          * "Algorithm to Check Access to an Existing File"
1802          * in MS-FSA.pdf.
1803          *
1804          * se_file_access_check()
1805          * also takes care of owner WRITE_DAC and READ_CONTROL.
1806          */
1807         status = se_file_access_check(sd,
1808                                  get_current_nttok(conn),
1809                                  use_privs,
1810                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
1811                                  &access_granted);
1812
1813         TALLOC_FREE(sd);
1814
1815         if (!NT_STATUS_IS_OK(status)) {
1816                 DEBUG(10, ("Access denied on file %s: "
1817                            "when calculating maximum access\n",
1818                            smb_fname_str_dbg(smb_fname)));
1819                 return NT_STATUS_ACCESS_DENIED;
1820         }
1821         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
1822
1823         if (!(access_granted & DELETE_ACCESS)) {
1824                 if (can_delete_file_in_directory(conn, smb_fname)) {
1825                         *p_access_mask |= DELETE_ACCESS;
1826                 }
1827         }
1828
1829         return NT_STATUS_OK;
1830 }
1831
1832 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
1833                                     const struct smb_filename *smb_fname,
1834                                     bool use_privs,
1835                                     uint32_t access_mask,
1836                                     uint32_t *access_mask_out)
1837 {
1838         NTSTATUS status;
1839         uint32_t orig_access_mask = access_mask;
1840         uint32_t rejected_share_access;
1841
1842         /*
1843          * Convert GENERIC bits to specific bits.
1844          */
1845
1846         se_map_generic(&access_mask, &file_generic_mapping);
1847
1848         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
1849         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
1850
1851                 status = smbd_calculate_maximum_allowed_access(
1852                         conn, smb_fname, use_privs, &access_mask);
1853
1854                 if (!NT_STATUS_IS_OK(status)) {
1855                         return status;
1856                 }
1857
1858                 access_mask &= conn->share_access;
1859         }
1860
1861         rejected_share_access = access_mask & ~(conn->share_access);
1862
1863         if (rejected_share_access) {
1864                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
1865                         "file %s: rejected by share access mask[0x%08X] "
1866                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
1867                         smb_fname_str_dbg(smb_fname),
1868                         conn->share_access,
1869                         orig_access_mask, access_mask,
1870                         rejected_share_access));
1871                 return NT_STATUS_ACCESS_DENIED;
1872         }
1873
1874         *access_mask_out = access_mask;
1875         return NT_STATUS_OK;
1876 }
1877
1878 /****************************************************************************
1879  Remove the deferred open entry under lock.
1880 ****************************************************************************/
1881
1882 /****************************************************************************
1883  Return true if this is a state pointer to an asynchronous create.
1884 ****************************************************************************/
1885
1886 bool is_deferred_open_async(const void *ptr)
1887 {
1888         const struct deferred_open_record *state = (const struct deferred_open_record *)ptr;
1889
1890         return state->async_open;
1891 }
1892
1893 static bool clear_ads(uint32_t create_disposition)
1894 {
1895         bool ret = false;
1896
1897         switch (create_disposition) {
1898         case FILE_SUPERSEDE:
1899         case FILE_OVERWRITE_IF:
1900         case FILE_OVERWRITE:
1901                 ret = true;
1902                 break;
1903         default:
1904                 break;
1905         }
1906         return ret;
1907 }
1908
1909 static int disposition_to_open_flags(uint32_t create_disposition)
1910 {
1911         int ret = 0;
1912
1913         /*
1914          * Currently we're using FILE_SUPERSEDE as the same as
1915          * FILE_OVERWRITE_IF but they really are
1916          * different. FILE_SUPERSEDE deletes an existing file
1917          * (requiring delete access) then recreates it.
1918          */
1919
1920         switch (create_disposition) {
1921         case FILE_SUPERSEDE:
1922         case FILE_OVERWRITE_IF:
1923                 /*
1924                  * If file exists replace/overwrite. If file doesn't
1925                  * exist create.
1926                  */
1927                 ret = O_CREAT|O_TRUNC;
1928                 break;
1929
1930         case FILE_OPEN:
1931                 /*
1932                  * If file exists open. If file doesn't exist error.
1933                  */
1934                 ret = 0;
1935                 break;
1936
1937         case FILE_OVERWRITE:
1938                 /*
1939                  * If file exists overwrite. If file doesn't exist
1940                  * error.
1941                  */
1942                 ret = O_TRUNC;
1943                 break;
1944
1945         case FILE_CREATE:
1946                 /*
1947                  * If file exists error. If file doesn't exist create.
1948                  */
1949                 ret = O_CREAT|O_EXCL;
1950                 break;
1951
1952         case FILE_OPEN_IF:
1953                 /*
1954                  * If file exists open. If file doesn't exist create.
1955                  */
1956                 ret = O_CREAT;
1957                 break;
1958         }
1959         return ret;
1960 }
1961
1962 static int calculate_open_access_flags(uint32_t access_mask,
1963                                        int oplock_request,
1964                                        uint32_t private_flags)
1965 {
1966         bool need_write, need_read;
1967
1968         /*
1969          * Note that we ignore the append flag as append does not
1970          * mean the same thing under DOS and Unix.
1971          */
1972
1973         need_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA));
1974         if (!need_write) {
1975                 return O_RDONLY;
1976         }
1977
1978         /* DENY_DOS opens are always underlying read-write on the
1979            file handle, no matter what the requested access mask
1980            says. */
1981
1982         need_read =
1983                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
1984                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
1985                                 FILE_READ_EA|FILE_EXECUTE));
1986
1987         if (!need_read) {
1988                 return O_WRONLY;
1989         }
1990         return O_RDWR;
1991 }
1992
1993 /****************************************************************************
1994  Open a file with a share mode. Passed in an already created files_struct *.
1995 ****************************************************************************/
1996
1997 static NTSTATUS open_file_ntcreate(connection_struct *conn,
1998                             struct smb_request *req,
1999                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
2000                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
2001                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
2002                             uint32 create_options,      /* options such as delete on close. */
2003                             uint32 new_dos_attributes,  /* attributes used for new file. */
2004                             int oplock_request,         /* internal Samba oplock codes. */
2005                                                         /* Information (FILE_EXISTS etc.) */
2006                             uint32_t private_flags,     /* Samba specific flags. */
2007                             int *pinfo,
2008                             files_struct *fsp)
2009 {
2010         struct smb_filename *smb_fname = fsp->fsp_name;
2011         int flags=0;
2012         int flags2=0;
2013         bool file_existed = VALID_STAT(smb_fname->st);
2014         bool def_acl = False;
2015         bool posix_open = False;
2016         bool new_file_created = False;
2017         bool first_open_attempt = true;
2018         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
2019         mode_t new_unx_mode = (mode_t)0;
2020         mode_t unx_mode = (mode_t)0;
2021         int info;
2022         uint32 existing_dos_attributes = 0;
2023         struct timeval request_time = timeval_zero();
2024         struct share_mode_lock *lck = NULL;
2025         uint32 open_access_mask = access_mask;
2026         NTSTATUS status;
2027         char *parent_dir;
2028         SMB_STRUCT_STAT saved_stat = smb_fname->st;
2029         struct timespec old_write_time;
2030         struct file_id id;
2031
2032         if (conn->printer) {
2033                 /*
2034                  * Printers are handled completely differently.
2035                  * Most of the passed parameters are ignored.
2036                  */
2037
2038                 if (pinfo) {
2039                         *pinfo = FILE_WAS_CREATED;
2040                 }
2041
2042                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
2043                            smb_fname_str_dbg(smb_fname)));
2044
2045                 if (!req) {
2046                         DEBUG(0,("open_file_ntcreate: printer open without "
2047                                 "an SMB request!\n"));
2048                         return NT_STATUS_INTERNAL_ERROR;
2049                 }
2050
2051                 return print_spool_open(fsp, smb_fname->base_name,
2052                                         req->vuid);
2053         }
2054
2055         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
2056                             NULL)) {
2057                 return NT_STATUS_NO_MEMORY;
2058         }
2059
2060         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2061                 posix_open = True;
2062                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2063                 new_dos_attributes = 0;
2064         } else {
2065                 /* Windows allows a new file to be created and
2066                    silently removes a FILE_ATTRIBUTE_DIRECTORY
2067                    sent by the client. Do the same. */
2068
2069                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
2070
2071                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
2072                  * created new. */
2073                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2074                                      smb_fname, parent_dir);
2075         }
2076
2077         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
2078                    "access_mask=0x%x share_access=0x%x "
2079                    "create_disposition = 0x%x create_options=0x%x "
2080                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
2081                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
2082                    access_mask, share_access, create_disposition,
2083                    create_options, (unsigned int)unx_mode, oplock_request,
2084                    (unsigned int)private_flags));
2085
2086         if ((req == NULL) && ((oplock_request & INTERNAL_OPEN_ONLY) == 0)) {
2087                 DEBUG(0, ("No smb request but not an internal only open!\n"));
2088                 return NT_STATUS_INTERNAL_ERROR;
2089         }
2090
2091         /*
2092          * Only non-internal opens can be deferred at all
2093          */
2094
2095         if (req) {
2096                 void *ptr;
2097                 if (get_deferred_open_message_state(req,
2098                                 &request_time,
2099                                 &ptr)) {
2100                         /* Remember the absolute time of the original
2101                            request with this mid. We'll use it later to
2102                            see if this has timed out. */
2103
2104                         /* If it was an async create retry, the file
2105                            didn't exist. */
2106
2107                         if (is_deferred_open_async(ptr)) {
2108                                 SET_STAT_INVALID(smb_fname->st);
2109                                 file_existed = false;
2110                         }
2111
2112                         /* Ensure we don't reprocess this message. */
2113                         remove_deferred_open_message_smb(req->sconn, req->mid);
2114
2115                         first_open_attempt = false;
2116                 }
2117         }
2118
2119         if (!posix_open) {
2120                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
2121                 if (file_existed) {
2122                         existing_dos_attributes = dos_mode(conn, smb_fname);
2123                 }
2124         }
2125
2126         /* ignore any oplock requests if oplocks are disabled */
2127         if (!lp_oplocks(SNUM(conn)) ||
2128             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
2129                 /* Mask off everything except the private Samba bits. */
2130                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2131         }
2132
2133         /* this is for OS/2 long file names - say we don't support them */
2134         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2135                 /* OS/2 Workplace shell fix may be main code stream in a later
2136                  * release. */
2137                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2138                          "supported.\n"));
2139                 if (use_nt_status()) {
2140                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2141                 }
2142                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2143         }
2144
2145         switch( create_disposition ) {
2146                 case FILE_OPEN:
2147                         /* If file exists open. If file doesn't exist error. */
2148                         if (!file_existed) {
2149                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2150                                          "requested for file %s and file "
2151                                          "doesn't exist.\n",
2152                                          smb_fname_str_dbg(smb_fname)));
2153                                 errno = ENOENT;
2154                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2155                         }
2156                         break;
2157
2158                 case FILE_OVERWRITE:
2159                         /* If file exists overwrite. If file doesn't exist
2160                          * error. */
2161                         if (!file_existed) {
2162                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2163                                          "requested for file %s and file "
2164                                          "doesn't exist.\n",
2165                                          smb_fname_str_dbg(smb_fname) ));
2166                                 errno = ENOENT;
2167                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2168                         }
2169                         break;
2170
2171                 case FILE_CREATE:
2172                         /* If file exists error. If file doesn't exist
2173                          * create. */
2174                         if (file_existed) {
2175                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2176                                          "requested for file %s and file "
2177                                          "already exists.\n",
2178                                          smb_fname_str_dbg(smb_fname)));
2179                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2180                                         errno = EISDIR;
2181                                 } else {
2182                                         errno = EEXIST;
2183                                 }
2184                                 return map_nt_error_from_unix(errno);
2185                         }
2186                         break;
2187
2188                 case FILE_SUPERSEDE:
2189                 case FILE_OVERWRITE_IF:
2190                 case FILE_OPEN_IF:
2191                         break;
2192                 default:
2193                         return NT_STATUS_INVALID_PARAMETER;
2194         }
2195
2196         flags2 = disposition_to_open_flags(create_disposition);
2197
2198         /* We only care about matching attributes on file exists and
2199          * overwrite. */
2200
2201         if (!posix_open && file_existed &&
2202             ((create_disposition == FILE_OVERWRITE) ||
2203              (create_disposition == FILE_OVERWRITE_IF))) {
2204                 if (!open_match_attributes(conn, existing_dos_attributes,
2205                                            new_dos_attributes,
2206                                            smb_fname->st.st_ex_mode,
2207                                            unx_mode, &new_unx_mode)) {
2208                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2209                                  "for file %s (%x %x) (0%o, 0%o)\n",
2210                                  smb_fname_str_dbg(smb_fname),
2211                                  existing_dos_attributes,
2212                                  new_dos_attributes,
2213                                  (unsigned int)smb_fname->st.st_ex_mode,
2214                                  (unsigned int)unx_mode ));
2215                         errno = EACCES;
2216                         return NT_STATUS_ACCESS_DENIED;
2217                 }
2218         }
2219
2220         status = smbd_calculate_access_mask(conn, smb_fname,
2221                                         false,
2222                                         access_mask,
2223                                         &access_mask);
2224         if (!NT_STATUS_IS_OK(status)) {
2225                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2226                         "on file %s returned %s\n",
2227                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2228                 return status;
2229         }
2230
2231         open_access_mask = access_mask;
2232
2233         if (flags2 & O_TRUNC) {
2234                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2235         }
2236
2237         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2238                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2239                     access_mask));
2240
2241         /*
2242          * Note that we ignore the append flag as append does not
2243          * mean the same thing under DOS and Unix.
2244          */
2245
2246         flags = calculate_open_access_flags(access_mask, oplock_request,
2247                                             private_flags);
2248
2249         /*
2250          * Currently we only look at FILE_WRITE_THROUGH for create options.
2251          */
2252
2253 #if defined(O_SYNC)
2254         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2255                 flags2 |= O_SYNC;
2256         }
2257 #endif /* O_SYNC */
2258
2259         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2260                 flags2 |= O_APPEND;
2261         }
2262
2263         if (!posix_open && !CAN_WRITE(conn)) {
2264                 /*
2265                  * We should really return a permission denied error if either
2266                  * O_CREAT or O_TRUNC are set, but for compatibility with
2267                  * older versions of Samba we just AND them out.
2268                  */
2269                 flags2 &= ~(O_CREAT|O_TRUNC);
2270         }
2271
2272         if (first_open_attempt && lp_kernel_oplocks(SNUM(conn))) {
2273                 /*
2274                  * With kernel oplocks the open breaking an oplock
2275                  * blocks until the oplock holder has given up the
2276                  * oplock or closed the file. We prevent this by first
2277                  * trying to open the file with O_NONBLOCK (see "man
2278                  * fcntl" on Linux). For the second try, triggered by
2279                  * an oplock break response, we do not need this
2280                  * anymore.
2281                  *
2282                  * This is true under the assumption that only Samba
2283                  * requests kernel oplocks. Once someone else like
2284                  * NFSv4 starts to use that API, we will have to
2285                  * modify this by communicating with the NFSv4 server.
2286                  */
2287                 flags2 |= O_NONBLOCK;
2288         }
2289
2290         /*
2291          * Ensure we can't write on a read-only share or file.
2292          */
2293
2294         if (flags != O_RDONLY && file_existed &&
2295             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2296                 DEBUG(5,("open_file_ntcreate: write access requested for "
2297                          "file %s on read only %s\n",
2298                          smb_fname_str_dbg(smb_fname),
2299                          !CAN_WRITE(conn) ? "share" : "file" ));
2300                 errno = EACCES;
2301                 return NT_STATUS_ACCESS_DENIED;
2302         }
2303
2304         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2305         fsp->share_access = share_access;
2306         fsp->fh->private_options = private_flags;
2307         fsp->access_mask = open_access_mask; /* We change this to the
2308                                               * requested access_mask after
2309                                               * the open is done. */
2310         fsp->posix_open = posix_open;
2311
2312         /* Ensure no SAMBA_PRIVATE bits can be set. */
2313         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2314
2315         if (timeval_is_zero(&request_time)) {
2316                 request_time = fsp->open_time;
2317         }
2318
2319         /*
2320          * Ensure we pay attention to default ACLs on directories if required.
2321          */
2322
2323         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2324             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2325                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2326         }
2327
2328         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2329                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2330                  (unsigned int)flags, (unsigned int)flags2,
2331                  (unsigned int)unx_mode, (unsigned int)access_mask,
2332                  (unsigned int)open_access_mask));
2333
2334         fsp_open = open_file(fsp, conn, req, parent_dir,
2335                              flags|flags2, unx_mode, access_mask,
2336                              open_access_mask, &new_file_created);
2337
2338         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
2339                 struct deferred_open_record state;
2340
2341                 /*
2342                  * EWOULDBLOCK/EAGAIN maps to NETWORK_BUSY.
2343                  */
2344                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
2345                         DEBUG(10, ("FIFO busy\n"));
2346                         return NT_STATUS_NETWORK_BUSY;
2347                 }
2348                 if (req == NULL) {
2349                         DEBUG(10, ("Internal open busy\n"));
2350                         return NT_STATUS_NETWORK_BUSY;
2351                 }
2352
2353                 /*
2354                  * From here on we assume this is an oplock break triggered
2355                  */
2356
2357                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
2358                 if (lck == NULL) {
2359                         state.delayed_for_oplocks = false;
2360                         state.async_open = false;
2361                         state.id = fsp->file_id;
2362                         defer_open(NULL, request_time, timeval_set(0, 0),
2363                                    req, &state);
2364                         DEBUG(10, ("No share mode lock found after "
2365                                    "EWOULDBLOCK, retrying sync\n"));
2366                         return NT_STATUS_SHARING_VIOLATION;
2367                 }
2368
2369                 if (!validate_oplock_types(lck)) {
2370                         smb_panic("validate_oplock_types failed");
2371                 }
2372
2373                 if (delay_for_oplock(fsp, 0, lck, false, create_disposition)) {
2374                         schedule_defer_open(lck, request_time, req);
2375                         TALLOC_FREE(lck);
2376                         DEBUG(10, ("Sent oplock break request to kernel "
2377                                    "oplock holder\n"));
2378                         return NT_STATUS_SHARING_VIOLATION;
2379                 }
2380
2381                 /*
2382                  * No oplock from Samba around. Immediately retry with
2383                  * a blocking open.
2384                  */
2385                 state.delayed_for_oplocks = false;
2386                 state.async_open = false;
2387                 state.id = lck->data->id;
2388                 defer_open(lck, request_time, timeval_set(0, 0), req, &state);
2389                 TALLOC_FREE(lck);
2390                 DEBUG(10, ("No Samba oplock around after EWOULDBLOCK. "
2391                            "Retrying sync\n"));
2392                 return NT_STATUS_SHARING_VIOLATION;
2393         }
2394
2395         if (!NT_STATUS_IS_OK(fsp_open)) {
2396                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2397                         schedule_async_open(request_time, req);
2398                 }
2399                 return fsp_open;
2400         }
2401
2402         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2403                 /*
2404                  * The file did exist, but some other (local or NFS)
2405                  * process either renamed/unlinked and re-created the
2406                  * file with different dev/ino after we walked the path,
2407                  * but before we did the open. We could retry the
2408                  * open but it's a rare enough case it's easier to
2409                  * just fail the open to prevent creating any problems
2410                  * in the open file db having the wrong dev/ino key.
2411                  */
2412                 fd_close(fsp);
2413                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2414                         "Old (dev=0x%llu, ino =0x%llu). "
2415                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2416                         " with NT_STATUS_ACCESS_DENIED.\n",
2417                          smb_fname_str_dbg(smb_fname),
2418                          (unsigned long long)saved_stat.st_ex_dev,
2419                          (unsigned long long)saved_stat.st_ex_ino,
2420                          (unsigned long long)smb_fname->st.st_ex_dev,
2421                          (unsigned long long)smb_fname->st.st_ex_ino));
2422                 return NT_STATUS_ACCESS_DENIED;
2423         }
2424
2425         old_write_time = smb_fname->st.st_ex_mtime;
2426
2427         /*
2428          * Deal with the race condition where two smbd's detect the
2429          * file doesn't exist and do the create at the same time. One
2430          * of them will win and set a share mode, the other (ie. this
2431          * one) should check if the requested share mode for this
2432          * create is allowed.
2433          */
2434
2435         /*
2436          * Now the file exists and fsp is successfully opened,
2437          * fsp->dev and fsp->inode are valid and should replace the
2438          * dev=0,inode=0 from a non existent file. Spotted by
2439          * Nadav Danieli <nadavd@exanet.com>. JRA.
2440          */
2441
2442         id = fsp->file_id;
2443
2444         lck = get_share_mode_lock(talloc_tos(), id,
2445                                   conn->connectpath,
2446                                   smb_fname, &old_write_time);
2447
2448         if (lck == NULL) {
2449                 DEBUG(0, ("open_file_ntcreate: Could not get share "
2450                           "mode lock for %s\n",
2451                           smb_fname_str_dbg(smb_fname)));
2452                 fd_close(fsp);
2453                 return NT_STATUS_SHARING_VIOLATION;
2454         }
2455
2456         /* Get the types we need to examine. */
2457         if (!validate_oplock_types(lck)) {
2458                 smb_panic("validate_oplock_types failed");
2459         }
2460
2461         if (has_delete_on_close(lck, fsp->name_hash)) {
2462                 TALLOC_FREE(lck);
2463                 fd_close(fsp);
2464                 return NT_STATUS_DELETE_PENDING;
2465         }
2466
2467         status = open_mode_check(conn, lck,
2468                                  access_mask, share_access);
2469
2470         if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
2471             (lck->data->num_share_modes > 0)) {
2472                 /*
2473                  * This comes from ancient times out of open_mode_check. I
2474                  * have no clue whether this is still necessary. I can't think
2475                  * of a case where this would actually matter further down in
2476                  * this function. I leave it here for further investigation
2477                  * :-)
2478                  */
2479                 file_existed = true;
2480         }
2481
2482         if ((req != NULL) &&
2483             delay_for_oplock(
2484                     fsp, oplock_request, lck,
2485                     NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION),
2486                     create_disposition)) {
2487                 schedule_defer_open(lck, request_time, req);
2488                 TALLOC_FREE(lck);
2489                 fd_close(fsp);
2490                 return NT_STATUS_SHARING_VIOLATION;
2491         }
2492
2493         if (!NT_STATUS_IS_OK(status)) {
2494                 uint32 can_access_mask;
2495                 bool can_access = True;
2496
2497                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2498
2499                 /* Check if this can be done with the deny_dos and fcb
2500                  * calls. */
2501                 if (private_flags &
2502                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2503                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2504                         if (req == NULL) {
2505                                 DEBUG(0, ("DOS open without an SMB "
2506                                           "request!\n"));
2507                                 TALLOC_FREE(lck);
2508                                 fd_close(fsp);
2509                                 return NT_STATUS_INTERNAL_ERROR;
2510                         }
2511
2512                         /* Use the client requested access mask here,
2513                          * not the one we open with. */
2514                         status = fcb_or_dos_open(req,
2515                                                  conn,
2516                                                  fsp,
2517                                                  smb_fname,
2518                                                  id,
2519                                                  req->smbpid,
2520                                                  req->vuid,
2521                                                  access_mask,
2522                                                  share_access,
2523                                                  create_options);
2524
2525                         if (NT_STATUS_IS_OK(status)) {
2526                                 TALLOC_FREE(lck);
2527                                 if (pinfo) {
2528                                         *pinfo = FILE_WAS_OPENED;
2529                                 }
2530                                 return NT_STATUS_OK;
2531                         }
2532                 }
2533
2534                 /*
2535                  * This next line is a subtlety we need for
2536                  * MS-Access. If a file open will fail due to share
2537                  * permissions and also for security (access) reasons,
2538                  * we need to return the access failed error, not the
2539                  * share error. We can't open the file due to kernel
2540                  * oplock deadlock (it's possible we failed above on
2541                  * the open_mode_check()) so use a userspace check.
2542                  */
2543
2544                 if (flags & O_RDWR) {
2545                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2546                 } else if (flags & O_WRONLY) {
2547                         can_access_mask = FILE_WRITE_DATA;
2548                 } else {
2549                         can_access_mask = FILE_READ_DATA;
2550                 }
2551
2552                 if (((can_access_mask & FILE_WRITE_DATA) &&
2553                      !CAN_WRITE(conn)) ||
2554                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2555                                                               smb_fname,
2556                                                               false,
2557                                                               can_access_mask))) {
2558                         can_access = False;
2559                 }
2560
2561                 /*
2562                  * If we're returning a share violation, ensure we
2563                  * cope with the braindead 1 second delay (SMB1 only).
2564                  */
2565
2566                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2567                     !conn->sconn->using_smb2 &&
2568                     lp_defer_sharing_violations()) {
2569                         struct timeval timeout;
2570                         struct deferred_open_record state;
2571                         int timeout_usecs;
2572
2573                         /* this is a hack to speed up torture tests
2574                            in 'make test' */
2575                         timeout_usecs = lp_parm_int(SNUM(conn),
2576                                                     "smbd","sharedelay",
2577                                                     SHARING_VIOLATION_USEC_WAIT);
2578
2579                         /* This is a relative time, added to the absolute
2580                            request_time value to get the absolute timeout time.
2581                            Note that if this is the second or greater time we enter
2582                            this codepath for this particular request mid then
2583                            request_time is left as the absolute time of the *first*
2584                            time this request mid was processed. This is what allows
2585                            the request to eventually time out. */
2586
2587                         timeout = timeval_set(0, timeout_usecs);
2588
2589                         /* Nothing actually uses state.delayed_for_oplocks
2590                            but it's handy to differentiate in debug messages
2591                            between a 30 second delay due to oplock break, and
2592                            a 1 second delay for share mode conflicts. */
2593
2594                         state.delayed_for_oplocks = False;
2595                         state.async_open = false;
2596                         state.id = id;
2597
2598                         if ((req != NULL)
2599                             && !request_timed_out(request_time,
2600                                                   timeout)) {
2601                                 defer_open(lck, request_time, timeout,
2602                                            req, &state);
2603                         }
2604                 }
2605
2606                 TALLOC_FREE(lck);
2607                 fd_close(fsp);
2608                 if (can_access) {
2609                         /*
2610                          * We have detected a sharing violation here
2611                          * so return the correct error code
2612                          */
2613                         status = NT_STATUS_SHARING_VIOLATION;
2614                 } else {
2615                         status = NT_STATUS_ACCESS_DENIED;
2616                 }
2617                 return status;
2618         }
2619
2620         grant_fsp_oplock_type(fsp, lck, oplock_request);
2621
2622         /*
2623          * We have the share entry *locked*.....
2624          */
2625
2626         /* Delete streams if create_disposition requires it */
2627         if (!new_file_created && clear_ads(create_disposition) &&
2628             !is_ntfs_stream_smb_fname(smb_fname)) {
2629                 status = delete_all_streams(conn, smb_fname->base_name);
2630                 if (!NT_STATUS_IS_OK(status)) {
2631                         TALLOC_FREE(lck);
2632                         fd_close(fsp);
2633                         return status;
2634                 }
2635         }
2636
2637         /* note that we ignore failure for the following. It is
2638            basically a hack for NFS, and NFS will never set one of
2639            these only read them. Nobody but Samba can ever set a deny
2640            mode and we have already checked our more authoritative
2641            locking database for permission to set this deny mode. If
2642            the kernel refuses the operations then the kernel is wrong.
2643            note that GPFS supports it as well - jmcd */
2644
2645         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
2646                 int ret_flock;
2647                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
2648                 if(ret_flock == -1 ){
2649
2650                         TALLOC_FREE(lck);
2651                         fd_close(fsp);
2652
2653                         return NT_STATUS_SHARING_VIOLATION;
2654                 }
2655         }
2656
2657         /*
2658          * At this point onwards, we can guarantee that the share entry
2659          * is locked, whether we created the file or not, and that the
2660          * deny mode is compatible with all current opens.
2661          */
2662
2663         /*
2664          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
2665          * but we don't have to store this - just ignore it on access check.
2666          */
2667         if (conn->sconn->using_smb2) {
2668                 /*
2669                  * SMB2 doesn't return it (according to Microsoft tests).
2670                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
2671                  * File created with access = 0x7 (Read, Write, Delete)
2672                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
2673                  */
2674                 fsp->access_mask = access_mask;
2675         } else {
2676                 /* But SMB1 does. */
2677                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
2678         }
2679
2680         if (file_existed) {
2681                 /* stat opens on existing files don't get oplocks. */
2682                 if (is_stat_open(open_access_mask)) {
2683                         fsp->oplock_type = NO_OPLOCK;
2684                 }
2685         }
2686
2687         if (new_file_created) {
2688                 info = FILE_WAS_CREATED;
2689         } else {
2690                 if (flags2 & O_TRUNC) {
2691                         info = FILE_WAS_OVERWRITTEN;
2692                 } else {
2693                         info = FILE_WAS_OPENED;
2694                 }
2695         }
2696
2697         if (pinfo) {
2698                 *pinfo = info;
2699         }
2700
2701         /*
2702          * Setup the oplock info in both the shared memory and
2703          * file structs.
2704          */
2705
2706         status = set_file_oplock(fsp, fsp->oplock_type);
2707         if (!NT_STATUS_IS_OK(status)) {
2708                 /*
2709                  * Could not get the kernel oplock
2710                  */
2711                 fsp->oplock_type = NO_OPLOCK;
2712         }
2713
2714         if (!set_share_mode(lck, fsp, get_current_uid(conn),
2715                             req ? req->mid : 0,
2716                             fsp->oplock_type)) {
2717                 TALLOC_FREE(lck);
2718                 fd_close(fsp);
2719                 return NT_STATUS_NO_MEMORY;
2720         }
2721
2722         /* Handle strange delete on close create semantics. */
2723         if (create_options & FILE_DELETE_ON_CLOSE) {
2724
2725                 status = can_set_delete_on_close(fsp, new_dos_attributes);
2726
2727                 if (!NT_STATUS_IS_OK(status)) {
2728                         /* Remember to delete the mode we just added. */
2729                         del_share_mode(lck, fsp);
2730                         TALLOC_FREE(lck);
2731                         fd_close(fsp);
2732                         return status;
2733                 }
2734                 /* Note that here we set the *inital* delete on close flag,
2735                    not the regular one. The magic gets handled in close. */
2736                 fsp->initial_delete_on_close = True;
2737         }
2738
2739         if (info != FILE_WAS_OPENED) {
2740                 /* Files should be initially set as archive */
2741                 if (lp_map_archive(SNUM(conn)) ||
2742                     lp_store_dos_attributes(SNUM(conn))) {
2743                         if (!posix_open) {
2744                                 if (file_set_dosmode(conn, smb_fname,
2745                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2746                                             parent_dir, true) == 0) {
2747                                         unx_mode = smb_fname->st.st_ex_mode;
2748                                 }
2749                         }
2750                 }
2751         }
2752
2753         /* Determine sparse flag. */
2754         if (posix_open) {
2755                 /* POSIX opens are sparse by default. */
2756                 fsp->is_sparse = true;
2757         } else {
2758                 fsp->is_sparse = (file_existed &&
2759                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
2760         }
2761
2762         /*
2763          * Take care of inherited ACLs on created files - if default ACL not
2764          * selected.
2765          */
2766
2767         if (!posix_open && new_file_created && !def_acl) {
2768
2769                 int saved_errno = errno; /* We might get ENOSYS in the next
2770                                           * call.. */
2771
2772                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
2773                     errno == ENOSYS) {
2774                         errno = saved_errno; /* Ignore ENOSYS */
2775                 }
2776
2777         } else if (new_unx_mode) {
2778
2779                 int ret = -1;
2780
2781                 /* Attributes need changing. File already existed. */
2782
2783                 {
2784                         int saved_errno = errno; /* We might get ENOSYS in the
2785                                                   * next call.. */
2786                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
2787
2788                         if (ret == -1 && errno == ENOSYS) {
2789                                 errno = saved_errno; /* Ignore ENOSYS */
2790                         } else {
2791                                 DEBUG(5, ("open_file_ntcreate: reset "
2792                                           "attributes of file %s to 0%o\n",
2793                                           smb_fname_str_dbg(smb_fname),
2794                                           (unsigned int)new_unx_mode));
2795                                 ret = 0; /* Don't do the fchmod below. */
2796                         }
2797                 }
2798
2799                 if ((ret == -1) &&
2800                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
2801                         DEBUG(5, ("open_file_ntcreate: failed to reset "
2802                                   "attributes of file %s to 0%o\n",
2803                                   smb_fname_str_dbg(smb_fname),
2804                                   (unsigned int)new_unx_mode));
2805         }
2806
2807         TALLOC_FREE(lck);
2808
2809         return NT_STATUS_OK;
2810 }
2811
2812
2813 /****************************************************************************
2814  Open a file for for write to ensure that we can fchmod it.
2815 ****************************************************************************/
2816
2817 NTSTATUS open_file_fchmod(connection_struct *conn,
2818                           struct smb_filename *smb_fname,
2819                           files_struct **result)
2820 {
2821         if (!VALID_STAT(smb_fname->st)) {
2822                 return NT_STATUS_INVALID_PARAMETER;
2823         }
2824
2825         return SMB_VFS_CREATE_FILE(
2826                 conn,                                   /* conn */
2827                 NULL,                                   /* req */
2828                 0,                                      /* root_dir_fid */
2829                 smb_fname,                              /* fname */
2830                 FILE_WRITE_DATA,                        /* access_mask */
2831                 (FILE_SHARE_READ | FILE_SHARE_WRITE |   /* share_access */
2832                     FILE_SHARE_DELETE),
2833                 FILE_OPEN,                              /* create_disposition*/
2834                 0,                                      /* create_options */
2835                 0,                                      /* file_attributes */
2836                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
2837                 0,                                      /* allocation_size */
2838                 0,                                      /* private_flags */
2839                 NULL,                                   /* sd */
2840                 NULL,                                   /* ea_list */
2841                 result,                                 /* result */
2842                 NULL);                                  /* pinfo */
2843 }
2844
2845 static NTSTATUS mkdir_internal(connection_struct *conn,
2846                                struct smb_filename *smb_dname,
2847                                uint32 file_attributes)
2848 {
2849         mode_t mode;
2850         char *parent_dir = NULL;
2851         NTSTATUS status;
2852         bool posix_open = false;
2853         bool need_re_stat = false;
2854         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
2855
2856         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
2857                 DEBUG(5,("mkdir_internal: failing share access "
2858                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
2859                 return NT_STATUS_ACCESS_DENIED;
2860         }
2861
2862         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
2863                             NULL)) {
2864                 return NT_STATUS_NO_MEMORY;
2865         }
2866
2867         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2868                 posix_open = true;
2869                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2870         } else {
2871                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
2872         }
2873
2874         status = check_parent_access(conn,
2875                                         smb_dname,
2876                                         access_mask);
2877         if(!NT_STATUS_IS_OK(status)) {
2878                 DEBUG(5,("mkdir_internal: check_parent_access "
2879                         "on directory %s for path %s returned %s\n",
2880                         parent_dir,
2881                         smb_dname->base_name,
2882                         nt_errstr(status) ));
2883                 return status;
2884         }
2885
2886         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
2887                 return map_nt_error_from_unix(errno);
2888         }
2889
2890         /* Ensure we're checking for a symlink here.... */
2891         /* We don't want to get caught by a symlink racer. */
2892
2893         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2894                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2895                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2896                 return map_nt_error_from_unix(errno);
2897         }
2898
2899         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
2900                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
2901                           smb_fname_str_dbg(smb_dname)));
2902                 return NT_STATUS_NOT_A_DIRECTORY;
2903         }
2904
2905         if (lp_store_dos_attributes(SNUM(conn))) {
2906                 if (!posix_open) {
2907                         file_set_dosmode(conn, smb_dname,
2908                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
2909                                          parent_dir, true);
2910                 }
2911         }
2912
2913         if (lp_inherit_perms(SNUM(conn))) {
2914                 inherit_access_posix_acl(conn, parent_dir,
2915                                          smb_dname->base_name, mode);
2916                 need_re_stat = true;
2917         }
2918
2919         if (!posix_open) {
2920                 /*
2921                  * Check if high bits should have been set,
2922                  * then (if bits are missing): add them.
2923                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
2924                  * dir.
2925                  */
2926                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
2927                     (mode & ~smb_dname->st.st_ex_mode)) {
2928                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
2929                                       (smb_dname->st.st_ex_mode |
2930                                           (mode & ~smb_dname->st.st_ex_mode)));
2931                         need_re_stat = true;
2932                 }
2933         }
2934
2935         /* Change the owner if required. */
2936         if (lp_inherit_owner(SNUM(conn))) {
2937                 change_dir_owner_to_parent(conn, parent_dir,
2938                                            smb_dname->base_name,
2939                                            &smb_dname->st);
2940                 need_re_stat = true;
2941         }
2942
2943         if (need_re_stat) {
2944                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2945                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2946                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2947                         return map_nt_error_from_unix(errno);
2948                 }
2949         }
2950
2951         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
2952                      smb_dname->base_name);
2953
2954         return NT_STATUS_OK;
2955 }
2956
2957 /****************************************************************************
2958  Open a directory from an NT SMB call.
2959 ****************************************************************************/
2960
2961 static NTSTATUS open_directory(connection_struct *conn,
2962                                struct smb_request *req,
2963                                struct smb_filename *smb_dname,
2964                                uint32 access_mask,
2965                                uint32 share_access,
2966                                uint32 create_disposition,
2967                                uint32 create_options,
2968                                uint32 file_attributes,
2969                                int *pinfo,
2970                                files_struct **result)
2971 {
2972         files_struct *fsp = NULL;
2973         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
2974         struct share_mode_lock *lck = NULL;
2975         NTSTATUS status;
2976         struct timespec mtimespec;
2977         int info = 0;
2978
2979         if (is_ntfs_stream_smb_fname(smb_dname)) {
2980                 DEBUG(2, ("open_directory: %s is a stream name!\n",
2981                           smb_fname_str_dbg(smb_dname)));
2982                 return NT_STATUS_NOT_A_DIRECTORY;
2983         }
2984
2985         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
2986                 /* Ensure we have a directory attribute. */
2987                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
2988         }
2989
2990         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
2991                  "share_access = 0x%x create_options = 0x%x, "
2992                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
2993                  smb_fname_str_dbg(smb_dname),
2994                  (unsigned int)access_mask,
2995                  (unsigned int)share_access,
2996                  (unsigned int)create_options,
2997                  (unsigned int)create_disposition,
2998                  (unsigned int)file_attributes));
2999
3000         status = smbd_calculate_access_mask(conn, smb_dname, false,
3001                                             access_mask, &access_mask);
3002         if (!NT_STATUS_IS_OK(status)) {
3003                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
3004                         "on file %s returned %s\n",
3005                         smb_fname_str_dbg(smb_dname),
3006                         nt_errstr(status)));
3007                 return status;
3008         }
3009
3010         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3011                         !security_token_has_privilege(get_current_nttok(conn),
3012                                         SEC_PRIV_SECURITY)) {
3013                 DEBUG(10, ("open_directory: open on %s "
3014                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3015                         smb_fname_str_dbg(smb_dname)));
3016                 return NT_STATUS_PRIVILEGE_NOT_HELD;
3017         }
3018
3019         switch( create_disposition ) {
3020                 case FILE_OPEN:
3021
3022                         if (!dir_existed) {
3023                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3024                         }
3025
3026                         info = FILE_WAS_OPENED;
3027                         break;
3028
3029                 case FILE_CREATE:
3030
3031                         /* If directory exists error. If directory doesn't
3032                          * exist create. */
3033
3034                         if (dir_existed) {
3035                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
3036                                 DEBUG(2, ("open_directory: unable to create "
3037                                           "%s. Error was %s\n",
3038                                           smb_fname_str_dbg(smb_dname),
3039                                           nt_errstr(status)));
3040                                 return status;
3041                         }
3042
3043                         status = mkdir_internal(conn, smb_dname,
3044                                                 file_attributes);
3045
3046                         if (!NT_STATUS_IS_OK(status)) {
3047                                 DEBUG(2, ("open_directory: unable to create "
3048                                           "%s. Error was %s\n",
3049                                           smb_fname_str_dbg(smb_dname),
3050                                           nt_errstr(status)));
3051                                 return status;
3052                         }
3053
3054                         info = FILE_WAS_CREATED;
3055                         break;
3056
3057                 case FILE_OPEN_IF:
3058                         /*
3059                          * If directory exists open. If directory doesn't
3060                          * exist create.
3061                          */
3062
3063                         if (dir_existed) {
3064                                 status = NT_STATUS_OK;
3065                                 info = FILE_WAS_OPENED;
3066                         } else {
3067                                 status = mkdir_internal(conn, smb_dname,
3068                                                 file_attributes);
3069
3070                                 if (NT_STATUS_IS_OK(status)) {
3071                                         info = FILE_WAS_CREATED;
3072                                 } else {
3073                                         /* Cope with create race. */
3074                                         if (!NT_STATUS_EQUAL(status,
3075                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
3076                                                 DEBUG(2, ("open_directory: unable to create "
3077                                                         "%s. Error was %s\n",
3078                                                         smb_fname_str_dbg(smb_dname),
3079                                                         nt_errstr(status)));
3080                                                 return status;
3081                                         }
3082                                         info = FILE_WAS_OPENED;
3083                                 }
3084                         }
3085
3086                         break;
3087
3088                 case FILE_SUPERSEDE:
3089                 case FILE_OVERWRITE:
3090                 case FILE_OVERWRITE_IF:
3091                 default:
3092                         DEBUG(5,("open_directory: invalid create_disposition "
3093                                  "0x%x for directory %s\n",
3094                                  (unsigned int)create_disposition,
3095                                  smb_fname_str_dbg(smb_dname)));
3096                         return NT_STATUS_INVALID_PARAMETER;
3097         }
3098
3099         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
3100                 DEBUG(5,("open_directory: %s is not a directory !\n",
3101                          smb_fname_str_dbg(smb_dname)));
3102                 return NT_STATUS_NOT_A_DIRECTORY;
3103         }
3104
3105         if (info == FILE_WAS_OPENED) {
3106                 status = smbd_check_access_rights(conn,
3107                                                 smb_dname,
3108                                                 false,
3109                                                 access_mask);
3110                 if (!NT_STATUS_IS_OK(status)) {
3111                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
3112                                 "file %s failed with %s\n",
3113                                 smb_fname_str_dbg(smb_dname),
3114                                 nt_errstr(status)));
3115                         return status;
3116                 }
3117         }
3118
3119         status = file_new(req, conn, &fsp);
3120         if(!NT_STATUS_IS_OK(status)) {
3121                 return status;
3122         }
3123
3124         /*
3125          * Setup the files_struct for it.
3126          */
3127
3128         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
3129         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
3130         fsp->file_pid = req ? req->smbpid : 0;
3131         fsp->can_lock = False;
3132         fsp->can_read = False;
3133         fsp->can_write = False;
3134
3135         fsp->share_access = share_access;
3136         fsp->fh->private_options = 0;
3137         /*
3138          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3139          */
3140         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3141         fsp->print_file = NULL;
3142         fsp->modified = False;
3143         fsp->oplock_type = NO_OPLOCK;
3144         fsp->sent_oplock_break = NO_BREAK_SENT;
3145         fsp->is_directory = True;
3146         fsp->posix_open = (file_attributes & FILE_FLAG_POSIX_SEMANTICS) ? True : False;
3147         status = fsp_set_smb_fname(fsp, smb_dname);
3148         if (!NT_STATUS_IS_OK(status)) {
3149                 file_free(req, fsp);
3150                 return status;
3151         }
3152
3153         mtimespec = smb_dname->st.st_ex_mtime;
3154
3155 #ifdef O_DIRECTORY
3156         status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
3157 #else
3158         /* POSIX allows us to open a directory with O_RDONLY. */
3159         status = fd_open(conn, fsp, O_RDONLY, 0);
3160 #endif
3161         if (!NT_STATUS_IS_OK(status)) {
3162                 DEBUG(5, ("open_directory: Could not open fd for "
3163                         "%s (%s)\n",
3164                         smb_fname_str_dbg(smb_dname),
3165                         nt_errstr(status)));
3166                 file_free(req, fsp);
3167                 return status;
3168         }
3169
3170         status = vfs_stat_fsp(fsp);
3171         if (!NT_STATUS_IS_OK(status)) {
3172                 fd_close(fsp);
3173                 file_free(req, fsp);
3174                 return status;
3175         }
3176
3177         /* Ensure there was no race condition. */
3178         if (!check_same_stat(&smb_dname->st, &fsp->fsp_name->st)) {
3179                 DEBUG(5,("open_directory: stat struct differs for "
3180                         "directory %s.\n",
3181                         smb_fname_str_dbg(smb_dname)));
3182                 fd_close(fsp);
3183                 file_free(req, fsp);
3184                 return NT_STATUS_ACCESS_DENIED;
3185         }
3186
3187         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
3188                                   conn->connectpath, smb_dname,
3189                                   &mtimespec);
3190
3191         if (lck == NULL) {
3192                 DEBUG(0, ("open_directory: Could not get share mode lock for "
3193                           "%s\n", smb_fname_str_dbg(smb_dname)));
3194                 fd_close(fsp);
3195                 file_free(req, fsp);
3196                 return NT_STATUS_SHARING_VIOLATION;
3197         }
3198
3199         if (has_delete_on_close(lck, fsp->name_hash)) {
3200                 TALLOC_FREE(lck);
3201                 fd_close(fsp);
3202                 file_free(req, fsp);
3203                 return NT_STATUS_DELETE_PENDING;
3204         }
3205
3206         status = open_mode_check(conn, lck,
3207                                  access_mask, share_access);
3208
3209         if (!NT_STATUS_IS_OK(status)) {
3210                 TALLOC_FREE(lck);
3211                 fd_close(fsp);
3212                 file_free(req, fsp);
3213                 return status;
3214         }
3215
3216         if (!set_share_mode(lck, fsp, get_current_uid(conn),
3217                             req ? req->mid : 0, NO_OPLOCK)) {
3218                 TALLOC_FREE(lck);
3219                 fd_close(fsp);
3220                 file_free(req, fsp);
3221                 return NT_STATUS_NO_MEMORY;
3222         }
3223
3224         /* For directories the delete on close bit at open time seems
3225            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
3226         if (create_options & FILE_DELETE_ON_CLOSE) {
3227                 status = can_set_delete_on_close(fsp, 0);
3228                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
3229                         del_share_mode(lck, fsp);
3230                         TALLOC_FREE(lck);
3231                         fd_close(fsp);
3232                         file_free(req, fsp);
3233                         return status;
3234                 }
3235
3236                 if (NT_STATUS_IS_OK(status)) {
3237                         /* Note that here we set the *inital* delete on close flag,
3238                            not the regular one. The magic gets handled in close. */
3239                         fsp->initial_delete_on_close = True;
3240                 }
3241         }
3242
3243         TALLOC_FREE(lck);
3244
3245         if (pinfo) {
3246                 *pinfo = info;
3247         }
3248
3249         *result = fsp;
3250         return NT_STATUS_OK;
3251 }
3252
3253 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
3254                           struct smb_filename *smb_dname)
3255 {
3256         NTSTATUS status;
3257         files_struct *fsp;
3258
3259         status = SMB_VFS_CREATE_FILE(
3260                 conn,                                   /* conn */
3261                 req,                                    /* req */
3262                 0,                                      /* root_dir_fid */
3263                 smb_dname,                              /* fname */
3264                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3265                 FILE_SHARE_NONE,                        /* share_access */
3266                 FILE_CREATE,                            /* create_disposition*/
3267                 FILE_DIRECTORY_FILE,                    /* create_options */
3268                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
3269                 0,                                      /* oplock_request */
3270                 0,                                      /* allocation_size */
3271                 0,                                      /* private_flags */
3272                 NULL,                                   /* sd */
3273                 NULL,                                   /* ea_list */
3274                 &fsp,                                   /* result */
3275                 NULL);                                  /* pinfo */
3276
3277         if (NT_STATUS_IS_OK(status)) {
3278                 close_file(req, fsp, NORMAL_CLOSE);
3279         }
3280
3281         return status;
3282 }
3283
3284 /****************************************************************************
3285  Receive notification that one of our open files has been renamed by another
3286  smbd process.
3287 ****************************************************************************/
3288
3289 void msg_file_was_renamed(struct messaging_context *msg,
3290                           void *private_data,
3291                           uint32_t msg_type,
3292                           struct server_id server_id,
3293                           DATA_BLOB *data)
3294 {
3295         files_struct *fsp;
3296         char *frm = (char *)data->data;
3297         struct file_id id;
3298         const char *sharepath;
3299         const char *base_name;
3300         const char *stream_name;
3301         struct smb_filename *smb_fname = NULL;
3302         size_t sp_len, bn_len;
3303         NTSTATUS status;
3304         struct smbd_server_connection *sconn =
3305                 talloc_get_type_abort(private_data,
3306                 struct smbd_server_connection);
3307
3308         if (data->data == NULL
3309             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
3310                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
3311                           (int)data->length));
3312                 return;
3313         }
3314
3315         /* Unpack the message. */
3316         pull_file_id_24(frm, &id);
3317         sharepath = &frm[24];
3318         sp_len = strlen(sharepath);
3319         base_name = sharepath + sp_len + 1;
3320         bn_len = strlen(base_name);
3321         stream_name = sharepath + sp_len + 1 + bn_len + 1;
3322
3323         /* stream_name must always be NULL if there is no stream. */
3324         if (stream_name[0] == '\0') {
3325                 stream_name = NULL;
3326         }
3327
3328         smb_fname = synthetic_smb_fname(talloc_tos(), base_name,
3329                                         stream_name, NULL);
3330         if (smb_fname == NULL) {
3331                 return;
3332         }
3333
3334         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
3335                 "file_id %s\n",
3336                 sharepath, smb_fname_str_dbg(smb_fname),
3337                 file_id_string_tos(&id)));
3338
3339         for(fsp = file_find_di_first(sconn, id); fsp;
3340             fsp = file_find_di_next(fsp)) {
3341                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
3342
3343                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
3344                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
3345                                 smb_fname_str_dbg(smb_fname)));
3346                         status = fsp_set_smb_fname(fsp, smb_fname);
3347                         if (!NT_STATUS_IS_OK(status)) {
3348                                 goto out;
3349                         }
3350                 } else {
3351                         /* TODO. JRA. */
3352                         /* Now we have the complete path we can work out if this is
3353                            actually within this share and adjust newname accordingly. */
3354                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
3355                                 "not sharepath %s) "
3356                                 "%s from %s -> %s\n",
3357                                 fsp->conn->connectpath,
3358                                 sharepath,
3359                                 fsp_fnum_dbg(fsp),
3360                                 fsp_str_dbg(fsp),
3361                                 smb_fname_str_dbg(smb_fname)));
3362                 }
3363         }
3364  out:
3365         TALLOC_FREE(smb_fname);
3366         return;
3367 }
3368
3369 /*
3370  * If a main file is opened for delete, all streams need to be checked for
3371  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
3372  * If that works, delete them all by setting the delete on close and close.
3373  */
3374
3375 NTSTATUS open_streams_for_delete(connection_struct *conn,
3376                                         const char *fname)
3377 {
3378         struct stream_struct *stream_info = NULL;
3379         files_struct **streams = NULL;
3380         int i;
3381         unsigned int num_streams = 0;
3382         TALLOC_CTX *frame = talloc_stackframe();
3383         NTSTATUS status;
3384
3385         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
3386                                 &num_streams, &stream_info);
3387
3388         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
3389             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
3390                 DEBUG(10, ("no streams around\n"));
3391                 TALLOC_FREE(frame);
3392                 return NT_STATUS_OK;
3393         }
3394
3395         if (!NT_STATUS_IS_OK(status)) {
3396                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
3397                            nt_errstr(status)));
3398                 goto fail;
3399         }
3400
3401         DEBUG(10, ("open_streams_for_delete found %d streams\n",
3402                    num_streams));
3403
3404         if (num_streams == 0) {
3405                 TALLOC_FREE(frame);
3406                 return NT_STATUS_OK;
3407         }
3408
3409         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
3410         if (streams == NULL) {
3411                 DEBUG(0, ("talloc failed\n"));
3412                 status = NT_STATUS_NO_MEMORY;
3413                 goto fail;
3414         }
3415
3416         for (i=0; i<num_streams; i++) {
3417                 struct smb_filename *smb_fname;
3418
3419                 if (strequal(stream_info[i].name, "::$DATA")) {
3420                         streams[i] = NULL;
3421                         continue;
3422                 }
3423
3424                 smb_fname = synthetic_smb_fname(
3425                         talloc_tos(), fname, stream_info[i].name, NULL);
3426                 if (smb_fname == NULL) {
3427                         status = NT_STATUS_NO_MEMORY;
3428                         goto fail;
3429                 }
3430
3431                 if (SMB_VFS_STAT(conn, smb_fname) == -1) {
3432                         DEBUG(10, ("Unable to stat stream: %s\n",
3433                                    smb_fname_str_dbg(smb_fname)));
3434                 }
3435
3436                 status = SMB_VFS_CREATE_FILE(
3437                          conn,                  /* conn */
3438                          NULL,                  /* req */
3439                          0,                     /* root_dir_fid */
3440                          smb_fname,             /* fname */
3441                          DELETE_ACCESS,         /* access_mask */
3442                          (FILE_SHARE_READ |     /* share_access */
3443                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
3444                          FILE_OPEN,             /* create_disposition*/
3445                          0,                     /* create_options */
3446                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
3447                          0,                     /* oplock_request */
3448                          0,                     /* allocation_size */
3449                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
3450                          NULL,                  /* sd */
3451                          NULL,                  /* ea_list */
3452                          &streams[i],           /* result */
3453                          NULL);                 /* pinfo */
3454
3455                 if (!NT_STATUS_IS_OK(status)) {
3456                         DEBUG(10, ("Could not open stream %s: %s\n",
3457                                    smb_fname_str_dbg(smb_fname),
3458                                    nt_errstr(status)));
3459
3460                         TALLOC_FREE(smb_fname);
3461                         break;
3462                 }
3463                 TALLOC_FREE(smb_fname);
3464         }
3465
3466         /*
3467          * don't touch the variable "status" beyond this point :-)
3468          */
3469
3470         for (i -= 1 ; i >= 0; i--) {
3471                 if (streams[i] == NULL) {
3472                         continue;
3473                 }
3474
3475                 DEBUG(10, ("Closing stream # %d, %s\n", i,
3476                            fsp_str_dbg(streams[i])));
3477                 close_file(NULL, streams[i], NORMAL_CLOSE);
3478         }
3479
3480  fail:
3481         TALLOC_FREE(frame);
3482         return status;
3483 }
3484
3485 /*********************************************************************
3486  Create a default ACL by inheriting from the parent. If no inheritance
3487  from the parent available, don't set anything. This will leave the actual
3488  permissions the new file or directory already got from the filesystem
3489  as the NT ACL when read.
3490 *********************************************************************/
3491
3492 static NTSTATUS inherit_new_acl(files_struct *fsp)
3493 {
3494         TALLOC_CTX *frame = talloc_stackframe();
3495         char *parent_name = NULL;
3496         struct security_descriptor *parent_desc = NULL;
3497         NTSTATUS status = NT_STATUS_OK;
3498         struct security_descriptor *psd = NULL;
3499         const struct dom_sid *owner_sid = NULL;
3500         const struct dom_sid *group_sid = NULL;
3501         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
3502         struct security_token *token = fsp->conn->session_info->security_token;
3503         bool inherit_owner = lp_inherit_owner(SNUM(fsp->conn));
3504         bool inheritable_components = false;
3505         bool try_builtin_administrators = false;
3506         const struct dom_sid *BA_U_sid = NULL;
3507         const struct dom_sid *BA_G_sid = NULL;
3508         bool try_system = false;
3509         const struct dom_sid *SY_U_sid = NULL;
3510         const struct dom_sid *SY_G_sid = NULL;
3511         size_t size = 0;
3512
3513         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
3514                 TALLOC_FREE(frame);
3515                 return NT_STATUS_NO_MEMORY;
3516         }
3517
3518         status = SMB_VFS_GET_NT_ACL(fsp->conn,
3519                                     parent_name,
3520                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
3521                                     frame,
3522                                     &parent_desc);
3523         if (!NT_STATUS_IS_OK(status)) {
3524                 TALLOC_FREE(frame);
3525                 return status;
3526         }
3527
3528         inheritable_components = sd_has_inheritable_components(parent_desc,
3529                                         fsp->is_directory);
3530
3531         if (!inheritable_components && !inherit_owner) {
3532                 TALLOC_FREE(frame);
3533                 /* Nothing to inherit and not setting owner. */
3534                 return NT_STATUS_OK;
3535         }
3536
3537         /* Create an inherited descriptor from the parent. */
3538
3539         if (DEBUGLEVEL >= 10) {
3540                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
3541                         fsp_str_dbg(fsp) ));
3542                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
3543         }
3544
3545         /* Inherit from parent descriptor if "inherit owner" set. */
3546         if (inherit_owner) {
3547                 owner_sid = parent_desc->owner_sid;
3548                 group_sid = parent_desc->group_sid;
3549         }
3550
3551         if (owner_sid == NULL) {
3552                 if (security_token_has_builtin_administrators(token)) {
3553                         try_builtin_administrators = true;
3554                 } else if (security_token_is_system(token)) {
3555                         try_builtin_administrators = true;
3556                         try_system = true;
3557                 }
3558         }
3559
3560         if (group_sid == NULL &&
3561             token->num_sids == PRIMARY_GROUP_SID_INDEX)
3562         {
3563                 if (security_token_is_system(token)) {
3564                         try_builtin_administrators = true;
3565                         try_system = true;
3566                 }
3567         }
3568
3569         if (try_builtin_administrators) {
3570                 struct unixid ids;
3571                 bool ok;
3572
3573                 ZERO_STRUCT(ids);
3574                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
3575                 if (ok) {
3576                         switch (ids.type) {
3577                         case ID_TYPE_BOTH:
3578                                 BA_U_sid = &global_sid_Builtin_Administrators;
3579                                 BA_G_sid = &global_sid_Builtin_Administrators;
3580                                 break;
3581                         case ID_TYPE_UID:
3582                                 BA_U_sid = &global_sid_Builtin_Administrators;
3583                                 break;
3584                         case ID_TYPE_GID:
3585                                 BA_G_sid = &global_sid_Builtin_Administrators;
3586                                 break;
3587                         default:
3588                                 break;
3589                         }
3590                 }
3591         }
3592
3593         if (try_system) {
3594                 struct unixid ids;
3595                 bool ok;
3596
3597                 ZERO_STRUCT(ids);
3598                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
3599                 if (ok) {
3600                         switch (ids.type) {
3601                         case ID_TYPE_BOTH:
3602                                 SY_U_sid = &global_sid_System;
3603                                 SY_G_sid = &global_sid_System;
3604                                 break;
3605                         case ID_TYPE_UID:
3606                                 SY_U_sid = &global_sid_System;
3607                                 break;
3608                         case ID_TYPE_GID:
3609                                 SY_G_sid = &global_sid_System;
3610                                 break;
3611                         default:
3612                                 break;
3613                         }
3614                 }
3615         }
3616
3617         if (owner_sid == NULL) {
3618                 owner_sid = BA_U_sid;
3619         }
3620
3621         if (owner_sid == NULL) {
3622                 owner_sid = SY_U_sid;
3623         }
3624
3625         if (group_sid == NULL) {
3626                 group_sid = SY_G_sid;
3627         }
3628
3629         if (try_system && group_sid == NULL) {
3630                 group_sid = BA_G_sid;
3631         }
3632
3633         if (owner_sid == NULL) {
3634                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3635         }
3636         if (group_sid == NULL) {
3637                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
3638                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3639                 } else {
3640                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
3641                 }
3642         }
3643
3644         status = se_create_child_secdesc(frame,
3645                         &psd,
3646                         &size,
3647                         parent_desc,
3648                         owner_sid,
3649                         group_sid,
3650                         fsp->is_directory);
3651         if (!NT_STATUS_IS_OK(status)) {
3652                 TALLOC_FREE(frame);
3653                 return status;
3654         }
3655
3656         /* If inheritable_components == false,
3657            se_create_child_secdesc()
3658            creates a security desriptor with a NULL dacl
3659            entry, but with SEC_DESC_DACL_PRESENT. We need
3660            to remove that flag. */
3661
3662         if (!inheritable_components) {
3663                 security_info_sent &= ~SECINFO_DACL;
3664                 psd->type &= ~SEC_DESC_DACL_PRESENT;
3665         }
3666
3667         if (DEBUGLEVEL >= 10) {
3668                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
3669                         fsp_str_dbg(fsp) ));
3670                 NDR_PRINT_DEBUG(security_descriptor, psd);
3671         }
3672
3673         if (inherit_owner) {
3674                 /* We need to be root to force this. */
3675                 become_root();
3676         }
3677         status = SMB_VFS_FSET_NT_ACL(fsp,
3678                         security_info_sent,
3679                         psd);
3680         if (inherit_owner) {
3681                 unbecome_root();
3682         }
3683         TALLOC_FREE(frame);
3684         return status;
3685 }
3686
3687 /*
3688  * Wrapper around open_file_ntcreate and open_directory
3689  */
3690
3691 static NTSTATUS create_file_unixpath(connection_struct *conn,
3692                                      struct smb_request *req,
3693                                      struct smb_filename *smb_fname,
3694                                      uint32_t access_mask,
3695                                      uint32_t share_access,
3696                                      uint32_t create_disposition,
3697                                      uint32_t create_options,
3698                                      uint32_t file_attributes,
3699                                      uint32_t oplock_request,
3700                                      uint64_t allocation_size,
3701                                      uint32_t private_flags,
3702                                      struct security_descriptor *sd,
3703                                      struct ea_list *ea_list,
3704
3705                                      files_struct **result,
3706                                      int *pinfo)
3707 {
3708         int info = FILE_WAS_OPENED;
3709         files_struct *base_fsp = NULL;
3710         files_struct *fsp = NULL;
3711         NTSTATUS status;
3712
3713         DEBUG(10,("create_file_unixpath: access_mask = 0x%x "
3714                   "file_attributes = 0x%x, share_access = 0x%x, "
3715                   "create_disposition = 0x%x create_options = 0x%x "
3716                   "oplock_request = 0x%x private_flags = 0x%x "
3717                   "ea_list = 0x%p, sd = 0x%p, "
3718                   "fname = %s\n",
3719                   (unsigned int)access_mask,
3720                   (unsigned int)file_attributes,
3721                   (unsigned int)share_access,
3722                   (unsigned int)create_disposition,
3723                   (unsigned int)create_options,
3724                   (unsigned int)oplock_request,
3725                   (unsigned int)private_flags,
3726                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
3727
3728         if (create_options & FILE_OPEN_BY_FILE_ID) {
3729                 status = NT_STATUS_NOT_SUPPORTED;
3730                 goto fail;
3731         }
3732
3733         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
3734                 status = NT_STATUS_INVALID_PARAMETER;
3735                 goto fail;
3736         }
3737
3738         if (req == NULL) {
3739                 oplock_request |= INTERNAL_OPEN_ONLY;
3740         }
3741
3742         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3743             && (access_mask & DELETE_ACCESS)
3744             && !is_ntfs_stream_smb_fname(smb_fname)) {
3745                 /*
3746                  * We can't open a file with DELETE access if any of the
3747                  * streams is open without FILE_SHARE_DELETE
3748                  */
3749                 status = open_streams_for_delete(conn, smb_fname->base_name);
3750
3751                 if (!NT_STATUS_IS_OK(status)) {
3752                         goto fail;
3753                 }
3754         }
3755
3756         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3757                         !security_token_has_privilege(get_current_nttok(conn),
3758                                         SEC_PRIV_SECURITY)) {
3759                 DEBUG(10, ("create_file_unixpath: open on %s "
3760                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3761                         smb_fname_str_dbg(smb_fname)));
3762                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
3763                 goto fail;
3764         }
3765
3766         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3767             && is_ntfs_stream_smb_fname(smb_fname)
3768             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
3769                 uint32 base_create_disposition;
3770                 struct smb_filename *smb_fname_base = NULL;
3771
3772                 if (create_options & FILE_DIRECTORY_FILE) {
3773                         status = NT_STATUS_NOT_A_DIRECTORY;
3774                         goto fail;
3775                 }
3776
3777                 switch (create_disposition) {
3778                 case FILE_OPEN:
3779                         base_create_disposition = FILE_OPEN;
3780                         break;
3781                 default:
3782                         base_create_disposition = FILE_OPEN_IF;
3783                         break;
3784                 }
3785
3786                 /* Create an smb_filename with stream_name == NULL. */
3787                 smb_fname_base = synthetic_smb_fname(talloc_tos(),
3788                                                      smb_fname->base_name,
3789                                                      NULL, NULL);
3790                 if (smb_fname_base == NULL) {
3791                         status = NT_STATUS_NO_MEMORY;
3792                         goto fail;
3793                 }
3794
3795                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
3796                         DEBUG(10, ("Unable to stat stream: %s\n",
3797                                    smb_fname_str_dbg(smb_fname_base)));
3798                 }
3799
3800                 /* Open the base file. */
3801                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
3802                                               FILE_SHARE_READ
3803                                               | FILE_SHARE_WRITE
3804                                               | FILE_SHARE_DELETE,
3805                                               base_create_disposition,
3806                                               0, 0, 0, 0, 0, NULL, NULL,
3807                                               &base_fsp, NULL);
3808                 TALLOC_FREE(smb_fname_base);
3809
3810                 if (!NT_STATUS_IS_OK(status)) {
3811                         DEBUG(10, ("create_file_unixpath for base %s failed: "
3812                                    "%s\n", smb_fname->base_name,
3813                                    nt_errstr(status)));
3814                         goto fail;
3815                 }
3816                 /* we don't need to low level fd */
3817                 fd_close(base_fsp);
3818         }
3819
3820         /*
3821          * If it's a request for a directory open, deal with it separately.
3822          */
3823
3824         if (create_options & FILE_DIRECTORY_FILE) {
3825
3826                 if (create_options & FILE_NON_DIRECTORY_FILE) {
3827                         status = NT_STATUS_INVALID_PARAMETER;
3828                         goto fail;
3829                 }
3830
3831                 /* Can't open a temp directory. IFS kit test. */
3832                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
3833                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
3834                         status = NT_STATUS_INVALID_PARAMETER;
3835                         goto fail;
3836                 }
3837
3838                 /*
3839                  * We will get a create directory here if the Win32
3840                  * app specified a security descriptor in the
3841                  * CreateDirectory() call.
3842                  */
3843
3844                 oplock_request = 0;
3845                 status = open_directory(
3846                         conn, req, smb_fname, access_mask, share_access,
3847                         create_disposition, create_options, file_attributes,
3848                         &info, &fsp);
3849         } else {
3850
3851                 /*
3852                  * Ordinary file case.
3853                  */
3854
3855                 status = file_new(req, conn, &fsp);
3856                 if(!NT_STATUS_IS_OK(status)) {
3857                         goto fail;
3858                 }
3859
3860                 status = fsp_set_smb_fname(fsp, smb_fname);
3861                 if (!NT_STATUS_IS_OK(status)) {
3862                         goto fail;
3863                 }
3864
3865                 if (base_fsp) {
3866                         /*
3867                          * We're opening the stream element of a
3868                          * base_fsp we already opened. Set up the
3869                          * base_fsp pointer.
3870                          */
3871                         fsp->base_fsp = base_fsp;
3872                 }
3873
3874                 if (allocation_size) {
3875                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
3876                                                         allocation_size);
3877                 }
3878
3879                 status = open_file_ntcreate(conn,
3880                                             req,
3881                                             access_mask,
3882                                             share_access,
3883                                             create_disposition,
3884                                             create_options,
3885                                             file_attributes,
3886                                             oplock_request,
3887                                             private_flags,
3888                                             &info,
3889                                             fsp);
3890
3891                 if(!NT_STATUS_IS_OK(status)) {
3892                         file_free(req, fsp);
3893                         fsp = NULL;
3894                 }
3895
3896                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
3897
3898                         /* A stream open never opens a directory */
3899
3900                         if (base_fsp) {
3901                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3902                                 goto fail;
3903                         }
3904
3905                         /*
3906                          * Fail the open if it was explicitly a non-directory
3907                          * file.
3908                          */
3909
3910                         if (create_options & FILE_NON_DIRECTORY_FILE) {
3911                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3912                                 goto fail;
3913                         }
3914
3915                         oplock_request = 0;
3916                         status = open_directory(
3917                                 conn, req, smb_fname, access_mask,
3918                                 share_access, create_disposition,
3919                                 create_options, file_attributes,
3920                                 &info, &fsp);
3921                 }
3922         }
3923
3924         if (!NT_STATUS_IS_OK(status)) {
3925                 goto fail;
3926         }
3927
3928         fsp->base_fsp = base_fsp;
3929
3930         if ((ea_list != NULL) &&
3931             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
3932                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
3933                 if (!NT_STATUS_IS_OK(status)) {
3934                         goto fail;
3935                 }
3936         }
3937
3938         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
3939                 status = NT_STATUS_ACCESS_DENIED;
3940                 goto fail;
3941         }
3942
3943         /* Save the requested allocation size. */
3944         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
3945                 if (allocation_size
3946                     && (allocation_size > fsp->fsp_name->st.st_ex_size)) {
3947                         fsp->initial_allocation_size = smb_roundup(
3948                                 fsp->conn, allocation_size);
3949                         if (fsp->is_directory) {
3950                                 /* Can't set allocation size on a directory. */
3951                                 status = NT_STATUS_ACCESS_DENIED;
3952                                 goto fail;
3953                         }
3954                         if (vfs_allocate_file_space(
3955                                     fsp, fsp->initial_allocation_size) == -1) {
3956                                 status = NT_STATUS_DISK_FULL;
3957                                 goto fail;
3958                         }
3959                 } else {
3960                         fsp->initial_allocation_size = smb_roundup(
3961                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
3962                 }
3963         } else {
3964                 fsp->initial_allocation_size = 0;
3965         }
3966
3967         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
3968                                 fsp->base_fsp == NULL) {
3969                 if (sd != NULL) {
3970                         /*
3971                          * According to the MS documentation, the only time the security
3972                          * descriptor is applied to the opened file is iff we *created* the
3973                          * file; an existing file stays the same.
3974                          *
3975                          * Also, it seems (from observation) that you can open the file with
3976                          * any access mask but you can still write the sd. We need to override
3977                          * the granted access before we call set_sd
3978                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
3979                          */
3980
3981                         uint32_t sec_info_sent;
3982                         uint32_t saved_access_mask = fsp->access_mask;
3983
3984                         sec_info_sent = get_sec_info(sd);
3985
3986                         fsp->access_mask = FILE_GENERIC_ALL;
3987
3988                         if (sec_info_sent & (SECINFO_OWNER|
3989                                                 SECINFO_GROUP|
3990                                                 SECINFO_DACL|
3991                                                 SECINFO_SACL)) {
3992                                 status = set_sd(fsp, sd, sec_info_sent);
3993                         }
3994
3995                         fsp->access_mask = saved_access_mask;
3996
3997                         if (!NT_STATUS_IS_OK(status)) {
3998                                 goto fail;
3999                         }
4000                 } else if (lp_inherit_acls(SNUM(conn))) {
4001                         /* Inherit from parent. Errors here are not fatal. */
4002                         status = inherit_new_acl(fsp);
4003                         if (!NT_STATUS_IS_OK(status)) {
4004                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
4005                                         fsp_str_dbg(fsp),
4006                                         nt_errstr(status) ));
4007                         }
4008                 }
4009         }
4010
4011         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
4012
4013         *result = fsp;
4014         if (pinfo != NULL) {
4015                 *pinfo = info;
4016         }
4017
4018         smb_fname->st = fsp->fsp_name->st;
4019
4020         return NT_STATUS_OK;
4021
4022  fail:
4023         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
4024
4025         if (fsp != NULL) {
4026                 if (base_fsp && fsp->base_fsp == base_fsp) {
4027                         /*
4028                          * The close_file below will close
4029                          * fsp->base_fsp.
4030                          */
4031                         base_fsp = NULL;
4032                 }
4033                 close_file(req, fsp, ERROR_CLOSE);
4034                 fsp = NULL;
4035         }
4036         if (base_fsp != NULL) {
4037                 close_file(req, base_fsp, ERROR_CLOSE);
4038                 base_fsp = NULL;
4039         }
4040         return status;
4041 }
4042
4043 /*
4044  * Calculate the full path name given a relative fid.
4045  */
4046 NTSTATUS get_relative_fid_filename(connection_struct *conn,
4047                                    struct smb_request *req,
4048                                    uint16_t root_dir_fid,
4049                                    const struct smb_filename *smb_fname,
4050                                    struct smb_filename **smb_fname_out)
4051 {
4052         files_struct *dir_fsp;
4053         char *parent_fname = NULL;
4054         char *new_base_name = NULL;
4055         NTSTATUS status;
4056
4057         if (root_dir_fid == 0 || !smb_fname) {
4058                 status = NT_STATUS_INTERNAL_ERROR;
4059                 goto out;
4060         }
4061
4062         dir_fsp = file_fsp(req, root_dir_fid);
4063
4064         if (dir_fsp == NULL) {
4065                 status = NT_STATUS_INVALID_HANDLE;
4066                 goto out;
4067         }
4068
4069         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
4070                 status = NT_STATUS_INVALID_HANDLE;
4071                 goto out;
4072         }
4073
4074         if (!dir_fsp->is_directory) {
4075
4076                 /*
4077                  * Check to see if this is a mac fork of some kind.
4078                  */
4079
4080                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
4081                     is_ntfs_stream_smb_fname(smb_fname)) {
4082                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
4083                         goto out;
4084                 }
4085
4086                 /*
4087                   we need to handle the case when we get a
4088                   relative open relative to a file and the
4089                   pathname is blank - this is a reopen!
4090                   (hint from demyn plantenberg)
4091                 */
4092
4093                 status = NT_STATUS_INVALID_HANDLE;
4094                 goto out;
4095         }
4096
4097         if (ISDOT(dir_fsp->fsp_name->base_name)) {
4098                 /*
4099                  * We're at the toplevel dir, the final file name
4100                  * must not contain ./, as this is filtered out
4101                  * normally by srvstr_get_path and unix_convert
4102                  * explicitly rejects paths containing ./.
4103                  */
4104                 parent_fname = talloc_strdup(talloc_tos(), "");
4105                 if (parent_fname == NULL) {
4106                         status = NT_STATUS_NO_MEMORY;
4107                         goto out;
4108                 }
4109         } else {
4110                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
4111
4112                 /*
4113                  * Copy in the base directory name.
4114                  */
4115
4116                 parent_fname = talloc_array(talloc_tos(), char,
4117                     dir_name_len+2);
4118                 if (parent_fname == NULL) {
4119                         status = NT_STATUS_NO_MEMORY;
4120                         goto out;
4121                 }
4122                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
4123                     dir_name_len+1);
4124
4125                 /*
4126                  * Ensure it ends in a '/'.
4127                  * We used TALLOC_SIZE +2 to add space for the '/'.
4128                  */
4129
4130                 if(dir_name_len
4131                     && (parent_fname[dir_name_len-1] != '\\')
4132                     && (parent_fname[dir_name_len-1] != '/')) {
4133                         parent_fname[dir_name_len] = '/';
4134                         parent_fname[dir_name_len+1] = '\0';
4135                 }
4136         }
4137
4138         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
4139                                         smb_fname->base_name);
4140         if (new_base_name == NULL) {
4141                 status = NT_STATUS_NO_MEMORY;
4142                 goto out;
4143         }
4144
4145         status = filename_convert(req,
4146                                 conn,
4147                                 req->flags2 & FLAGS2_DFS_PATHNAMES,
4148                                 new_base_name,
4149                                 0,
4150                                 NULL,
4151                                 smb_fname_out);
4152         if (!NT_STATUS_IS_OK(status)) {
4153                 goto out;
4154         }
4155
4156  out:
4157         TALLOC_FREE(parent_fname);
4158         TALLOC_FREE(new_base_name);
4159         return status;
4160 }
4161
4162 NTSTATUS create_file_default(connection_struct *conn,
4163                              struct smb_request *req,
4164                              uint16_t root_dir_fid,
4165                              struct smb_filename *smb_fname,
4166                              uint32_t access_mask,
4167                              uint32_t share_access,
4168                              uint32_t create_disposition,
4169                              uint32_t create_options,
4170                              uint32_t file_attributes,
4171                              uint32_t oplock_request,
4172                              uint64_t allocation_size,
4173                              uint32_t private_flags,
4174                              struct security_descriptor *sd,
4175                              struct ea_list *ea_list,
4176                              files_struct **result,
4177                              int *pinfo)
4178 {
4179         int info = FILE_WAS_OPENED;
4180         files_struct *fsp = NULL;
4181         NTSTATUS status;
4182         bool stream_name = false;
4183
4184         DEBUG(10,("create_file: access_mask = 0x%x "
4185                   "file_attributes = 0x%x, share_access = 0x%x, "
4186                   "create_disposition = 0x%x create_options = 0x%x "
4187                   "oplock_request = 0x%x "
4188                   "private_flags = 0x%x "
4189                   "root_dir_fid = 0x%x, ea_list = 0x%p, sd = 0x%p, "
4190                   "fname = %s\n",
4191                   (unsigned int)access_mask,
4192                   (unsigned int)file_attributes,
4193                   (unsigned int)share_access,
4194                   (unsigned int)create_disposition,
4195                   (unsigned int)create_options,
4196                   (unsigned int)oplock_request,
4197                   (unsigned int)private_flags,
4198                   (unsigned int)root_dir_fid,
4199                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4200
4201         /*
4202          * Calculate the filename from the root_dir_if if necessary.
4203          */
4204
4205         if (root_dir_fid != 0) {
4206                 struct smb_filename *smb_fname_out = NULL;
4207                 status = get_relative_fid_filename(conn, req, root_dir_fid,
4208                                                    smb_fname, &smb_fname_out);
4209                 if (!NT_STATUS_IS_OK(status)) {
4210                         goto fail;
4211                 }
4212                 smb_fname = smb_fname_out;
4213         }
4214
4215         /*
4216          * Check to see if this is a mac fork of some kind.
4217          */
4218
4219         stream_name = is_ntfs_stream_smb_fname(smb_fname);
4220         if (stream_name) {
4221                 enum FAKE_FILE_TYPE fake_file_type;
4222
4223                 fake_file_type = is_fake_file(smb_fname);
4224
4225                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
4226
4227                         /*
4228                          * Here we go! support for changing the disk quotas
4229                          * --metze
4230                          *
4231                          * We need to fake up to open this MAGIC QUOTA file
4232                          * and return a valid FID.
4233                          *
4234                          * w2k close this file directly after openening xp
4235                          * also tries a QUERY_FILE_INFO on the file and then
4236                          * close it
4237                          */
4238                         status = open_fake_file(req, conn, req->vuid,
4239                                                 fake_file_type, smb_fname,
4240                                                 access_mask, &fsp);
4241                         if (!NT_STATUS_IS_OK(status)) {
4242                                 goto fail;
4243                         }
4244
4245                         ZERO_STRUCT(smb_fname->st);
4246                         goto done;
4247                 }
4248
4249                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
4250                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
4251                         goto fail;
4252                 }
4253         }
4254
4255         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
4256                 int ret;
4257                 smb_fname->stream_name = NULL;
4258                 /* We have to handle this error here. */
4259                 if (create_options & FILE_DIRECTORY_FILE) {
4260                         status = NT_STATUS_NOT_A_DIRECTORY;
4261                         goto fail;
4262                 }
4263                 if (lp_posix_pathnames()) {
4264                         ret = SMB_VFS_LSTAT(conn, smb_fname);
4265                 } else {
4266                         ret = SMB_VFS_STAT(conn, smb_fname);
4267                 }
4268
4269                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
4270                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
4271                         goto fail;
4272                 }
4273         }
4274
4275         status = create_file_unixpath(
4276                 conn, req, smb_fname, access_mask, share_access,
4277                 create_disposition, create_options, file_attributes,
4278                 oplock_request, allocation_size, private_flags,
4279                 sd, ea_list,
4280                 &fsp, &info);
4281
4282         if (!NT_STATUS_IS_OK(status)) {
4283                 goto fail;
4284         }
4285
4286  done:
4287         DEBUG(10, ("create_file: info=%d\n", info));
4288
4289         *result = fsp;
4290         if (pinfo != NULL) {
4291                 *pinfo = info;
4292         }
4293         return NT_STATUS_OK;
4294
4295  fail:
4296         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
4297
4298         if (fsp != NULL) {
4299                 close_file(req, fsp, ERROR_CLOSE);
4300                 fsp = NULL;
4301         }
4302         return status;
4303 }