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 "auth.h"
  32 #include "serverid.h"
  33 #include "messages.h"
  34
  35 extern const struct generic_mapping file_generic_mapping;
  36
  37 struct deferred_open_record {
  38         bool delayed_for_oplocks;
  39         bool async_open;
  40         struct file_id id;
  41 };
  42
  43 /****************************************************************************
  44  If the requester wanted DELETE_ACCESS and was rejected because
  45  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  46  overrides this.
  47 ****************************************************************************/
  48
  49 static bool parent_override_delete(connection_struct *conn,
  50                                         const struct smb_filename *smb_fname,
  51                                         uint32_t access_mask,
  52                                         uint32_t rejected_mask)
  53 {
  54         if ((access_mask & DELETE_ACCESS) &&
  55                     (rejected_mask & DELETE_ACCESS) &&
  56                     can_delete_file_in_directory(conn, smb_fname)) {
  57                 return true;
  58         }
  59         return false;
  60 }
  61
  62 /****************************************************************************
  63  Check if we have open rights.
  64 ****************************************************************************/
  65
  66 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  67                                 const struct smb_filename *smb_fname,
  68                                 bool use_privs,
  69                                 uint32_t access_mask)
  70 {
  71         /* Check if we have rights to open. */
  72         NTSTATUS status;
  73         struct security_descriptor *sd = NULL;
  74         uint32_t rejected_share_access;
  75         uint32_t rejected_mask = access_mask;
  76
  77         rejected_share_access = access_mask & ~(conn->share_access);
  78
  79         if (rejected_share_access) {
  80                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  81                         "on %s (0x%x)\n",
  82                         (unsigned int)access_mask,
  83                         smb_fname_str_dbg(smb_fname),
  84                         (unsigned int)rejected_share_access ));
  85                 return NT_STATUS_ACCESS_DENIED;
  86         }
  87
  88         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
  89                 /* I'm sorry sir, I didn't know you were root... */
  90                 DEBUG(10,("smbd_check_access_rights: root override "
  91                         "on %s. Granting 0x%x\n",
  92                         smb_fname_str_dbg(smb_fname),
  93                         (unsigned int)access_mask ));
  94                 return NT_STATUS_OK;
  95         }
  96
  97         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
  98                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
  99                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 100                         smb_fname_str_dbg(smb_fname),
 101                         (unsigned int)access_mask ));
 102                 return NT_STATUS_OK;
 103         }
 104
 105         if (access_mask == DELETE_ACCESS &&
 106                         VALID_STAT(smb_fname->st) &&
 107                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 108                 /* We can always delete a symlink. */
 109                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 110                         "on DELETE_ACCESS on symlink %s.\n",
 111                         smb_fname_str_dbg(smb_fname) ));
 112                 return NT_STATUS_OK;
 113         }
 114
 115         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
 116                         (SECINFO_OWNER |
 117                         SECINFO_GROUP |
 118                         SECINFO_DACL),&sd);
 119
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 122                         "on %s: %s\n",
 123                         smb_fname_str_dbg(smb_fname),
 124                         nt_errstr(status)));
 125
 126                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 127                         goto access_denied;
 128                 }
 129
 130                 return status;
 131         }
 132
 133         /*
 134          * Never test FILE_READ_ATTRIBUTES. se_file_access_check() also takes care of
 135          * owner WRITE_DAC and READ_CONTROL.
 136          */
 137         status = se_file_access_check(sd,
 138                                 get_current_nttok(conn),
 139                                 use_privs,
 140                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 141                                 &rejected_mask);
 142
 143         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 144                 "0x%x returning 0x%x (%s)\n",
 145                 smb_fname_str_dbg(smb_fname),
 146                 (unsigned int)access_mask,
 147                 (unsigned int)rejected_mask,
 148                 nt_errstr(status) ));
 149
 150         if (!NT_STATUS_IS_OK(status)) {
 151                 if (DEBUGLEVEL >= 10) {
 152                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 153                                 smb_fname_str_dbg(smb_fname) ));
 154                         NDR_PRINT_DEBUG(security_descriptor, sd);
 155                 }
 156         }
 157
 158         TALLOC_FREE(sd);
 159
 160         if (NT_STATUS_IS_OK(status) ||
 161                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 162                 return status;
 163         }
 164
 165         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 166
 167   access_denied:
 168
 169         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 170                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 171                         !lp_store_dos_attributes(SNUM(conn)) &&
 172                         (lp_map_readonly(SNUM(conn)) ||
 173                         lp_map_archive(SNUM(conn)) ||
 174                         lp_map_hidden(SNUM(conn)) ||
 175                         lp_map_system(SNUM(conn)))) {
 176                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 177
 178                 DEBUG(10,("smbd_check_access_rights: "
 179                         "overrode "
 180                         "FILE_WRITE_ATTRIBUTES "
 181                         "on file %s\n",
 182                         smb_fname_str_dbg(smb_fname)));
 183         }
 184
 185         if (parent_override_delete(conn,
 186                                 smb_fname,
 187                                 access_mask,
 188                                 rejected_mask)) {
 189                 /* Were we trying to do an open
 190                  * for delete and didn't get DELETE
 191                  * access (only) ? Check if the
 192                  * directory allows DELETE_CHILD.
 193                  * See here:
 194                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 195                  * for details. */
 196
 197                 rejected_mask &= ~DELETE_ACCESS;
 198
 199                 DEBUG(10,("smbd_check_access_rights: "
 200                         "overrode "
 201                         "DELETE_ACCESS on "
 202                         "file %s\n",
 203                         smb_fname_str_dbg(smb_fname)));
 204         }
 205
 206         if (rejected_mask != 0) {
 207                 return NT_STATUS_ACCESS_DENIED;
 208         }
 209         return NT_STATUS_OK;
 210 }
 211
 212 static NTSTATUS check_parent_access(struct connection_struct *conn,
 213                                 struct smb_filename *smb_fname,
 214                                 uint32_t access_mask)
 215 {
 216         NTSTATUS status;
 217         char *parent_dir = NULL;
 218         struct security_descriptor *parent_sd = NULL;
 219         uint32_t access_granted = 0;
 220
 221         if (!parent_dirname(talloc_tos(),
 222                                 smb_fname->base_name,
 223                                 &parent_dir,
 224                                 NULL)) {
 225                 return NT_STATUS_NO_MEMORY;
 226         }
 227
 228         if (get_current_uid(conn) == (uid_t)0) {
 229                 /* I'm sorry sir, I didn't know you were root... */
 230                 DEBUG(10,("check_parent_access: root override "
 231                         "on %s. Granting 0x%x\n",
 232                         smb_fname_str_dbg(smb_fname),
 233                         (unsigned int)access_mask ));
 234                 return NT_STATUS_OK;
 235         }
 236
 237         status = SMB_VFS_GET_NT_ACL(conn,
 238                                 parent_dir,
 239                                 SECINFO_DACL,
 240                                 &parent_sd);
 241
 242         if (!NT_STATUS_IS_OK(status)) {
 243                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 244                         "%s with error %s\n",
 245                         parent_dir,
 246                         nt_errstr(status)));
 247                 return status;
 248         }
 249
 250         /*
 251          * Never test FILE_READ_ATTRIBUTES. se_file_access_check() also takes care of
 252          * owner WRITE_DAC and READ_CONTROL.
 253          */
 254         status = se_file_access_check(parent_sd,
 255                                 get_current_nttok(conn),
 256                                 false,
 257                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 258                                 &access_granted);
 259         if(!NT_STATUS_IS_OK(status)) {
 260                 DEBUG(5,("check_parent_access: access check "
 261                         "on directory %s for "
 262                         "path %s for mask 0x%x returned (0x%x) %s\n",
 263                         parent_dir,
 264                         smb_fname->base_name,
 265                         access_mask,
 266                         access_granted,
 267                         nt_errstr(status) ));
 268                 return status;
 269         }
 270
 271         return NT_STATUS_OK;
 272 }
 273
 274 /****************************************************************************
 275  fd support routines - attempt to do a dos_open.
 276 ****************************************************************************/
 277
 278 NTSTATUS fd_open(struct connection_struct *conn,
 279                  files_struct *fsp,
 280                  int flags,
 281                  mode_t mode)
 282 {
 283         struct smb_filename *smb_fname = fsp->fsp_name;
 284         NTSTATUS status = NT_STATUS_OK;
 285
 286 #ifdef O_NOFOLLOW
 287         /*
 288          * Never follow symlinks on a POSIX client. The
 289          * client should be doing this.
 290          */
 291
 292         if (fsp->posix_open || !lp_symlinks(SNUM(conn))) {
 293                 flags |= O_NOFOLLOW;
 294         }
 295 #endif
 296
 297         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 298         if (fsp->fh->fd == -1) {
 299                 int posix_errno = errno;
 300 #ifdef O_NOFOLLOW
 301 #if defined(ENOTSUP) && defined(OSF1)
 302                 /* handle special Tru64 errno */
 303                 if (errno == ENOTSUP) {
 304                         posix_errno = ELOOP;
 305                 }
 306 #endif /* ENOTSUP */
 307 #ifdef EFTYPE
 308                 /* fix broken NetBSD errno */
 309                 if (errno == EFTYPE) {
 310                         posix_errno = ELOOP;
 311                 }
 312 #endif /* EFTYPE */
 313                 /* fix broken FreeBSD errno */
 314                 if (errno == EMLINK) {
 315                         posix_errno = ELOOP;
 316                 }
 317 #endif /* O_NOFOLLOW */
 318                 status = map_nt_error_from_unix(posix_errno);
 319                 if (errno == EMFILE) {
 320                         static time_t last_warned = 0L;
 321
 322                         if (time((time_t *) NULL) > last_warned) {
 323                                 DEBUG(0,("Too many open files, unable "
 324                                         "to open more!  smbd's max "
 325                                         "open files = %d\n",
 326                                         lp_max_open_files()));
 327                                 last_warned = time((time_t *) NULL);
 328                         }
 329                 }
 330
 331         }
 332
 333         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 334                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 335                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 336
 337         return status;
 338 }
 339
 340 /****************************************************************************
 341  Close the file associated with a fsp.
 342 ****************************************************************************/
 343
 344 NTSTATUS fd_close(files_struct *fsp)
 345 {
 346         int ret;
 347
 348         if (fsp->dptr) {
 349                 dptr_CloseDir(fsp);
 350         }
 351         if (fsp->fh->fd == -1) {
 352                 return NT_STATUS_OK; /* What we used to call a stat open. */
 353         }
 354         if (fsp->fh->ref_count > 1) {
 355                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 356         }
 357
 358         ret = SMB_VFS_CLOSE(fsp);
 359         fsp->fh->fd = -1;
 360         if (ret == -1) {
 361                 return map_nt_error_from_unix(errno);
 362         }
 363         return NT_STATUS_OK;
 364 }
 365
 366 /****************************************************************************
 367  Change the ownership of a file to that of the parent directory.
 368  Do this by fd if possible.
 369 ****************************************************************************/
 370
 371 void change_file_owner_to_parent(connection_struct *conn,
 372                                         const char *inherit_from_dir,
 373                                         files_struct *fsp)
 374 {
 375         struct smb_filename *smb_fname_parent = NULL;
 376         NTSTATUS status;
 377         int ret;
 378
 379         status = create_synthetic_smb_fname(talloc_tos(), inherit_from_dir,
 380                                             NULL, NULL, &smb_fname_parent);
 381         if (!NT_STATUS_IS_OK(status)) {
 382                 return;
 383         }
 384
 385         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 386         if (ret == -1) {
 387                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 388                          "directory %s. Error was %s\n",
 389                          smb_fname_str_dbg(smb_fname_parent),
 390                          strerror(errno)));
 391                 TALLOC_FREE(smb_fname_parent);
 392                 return;
 393         }
 394
 395         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 396                 /* Already this uid - no need to change. */
 397                 DEBUG(10,("change_file_owner_to_parent: file %s "
 398                         "is already owned by uid %d\n",
 399                         fsp_str_dbg(fsp),
 400                         (int)fsp->fsp_name->st.st_ex_uid ));
 401                 TALLOC_FREE(smb_fname_parent);
 402                 return;
 403         }
 404
 405         become_root();
 406         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 407         unbecome_root();
 408         if (ret == -1) {
 409                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 410                          "file %s to parent directory uid %u. Error "
 411                          "was %s\n", fsp_str_dbg(fsp),
 412                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 413                          strerror(errno) ));
 414         } else {
 415                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 416                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 417                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 418                 /* Ensure the uid entry is updated. */
 419                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 420         }
 421
 422         TALLOC_FREE(smb_fname_parent);
 423 }
 424
 425 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 426                                        const char *inherit_from_dir,
 427                                        const char *fname,
 428                                        SMB_STRUCT_STAT *psbuf)
 429 {
 430         struct smb_filename *smb_fname_parent = NULL;
 431         struct smb_filename *smb_fname_cwd = NULL;
 432         char *saved_dir = NULL;
 433         TALLOC_CTX *ctx = talloc_tos();
 434         NTSTATUS status = NT_STATUS_OK;
 435         int ret;
 436
 437         status = create_synthetic_smb_fname(ctx, inherit_from_dir, NULL, NULL,
 438                                             &smb_fname_parent);
 439         if (!NT_STATUS_IS_OK(status)) {
 440                 return status;
 441         }
 442
 443         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 444         if (ret == -1) {
 445                 status = map_nt_error_from_unix(errno);
 446                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 447                          "directory %s. Error was %s\n",
 448                          smb_fname_str_dbg(smb_fname_parent),
 449                          strerror(errno)));
 450                 goto out;
 451         }
 452
 453         /* We've already done an lstat into psbuf, and we know it's a
 454            directory. If we can cd into the directory and the dev/ino
 455            are the same then we can safely chown without races as
 456            we're locking the directory in place by being in it.  This
 457            should work on any UNIX (thanks tridge :-). JRA.
 458         */
 459
 460         saved_dir = vfs_GetWd(ctx,conn);
 461         if (!saved_dir) {
 462                 status = map_nt_error_from_unix(errno);
 463                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 464                          "current working directory. Error was %s\n",
 465                          strerror(errno)));
 466                 goto out;
 467         }
 468
 469         /* Chdir into the new path. */
 470         if (vfs_ChDir(conn, fname) == -1) {
 471                 status = map_nt_error_from_unix(errno);
 472                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 473                          "current working directory to %s. Error "
 474                          "was %s\n", fname, strerror(errno) ));
 475                 goto chdir;
 476         }
 477
 478         status = create_synthetic_smb_fname(ctx, ".", NULL, NULL,
 479                                             &smb_fname_cwd);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 return status;
 482         }
 483
 484         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 485         if (ret == -1) {
 486                 status = map_nt_error_from_unix(errno);
 487                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 488                          "directory '.' (%s) Error was %s\n",
 489                          fname, strerror(errno)));
 490                 goto chdir;
 491         }
 492
 493         /* Ensure we're pointing at the same place. */
 494         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 495             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 496                 DEBUG(0,("change_dir_owner_to_parent: "
 497                          "device/inode on directory %s changed. "
 498                          "Refusing to chown !\n", fname ));
 499                 status = NT_STATUS_ACCESS_DENIED;
 500                 goto chdir;
 501         }
 502
 503         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 504                 /* Already this uid - no need to change. */
 505                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 506                         "is already owned by uid %d\n",
 507                         fname,
 508                         (int)smb_fname_cwd->st.st_ex_uid ));
 509                 status = NT_STATUS_OK;
 510                 goto chdir;
 511         }
 512
 513         become_root();
 514         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
 515                             (gid_t)-1);
 516         unbecome_root();
 517         if (ret == -1) {
 518                 status = map_nt_error_from_unix(errno);
 519                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
 520                           "directory %s to parent directory uid %u. "
 521                           "Error was %s\n", fname,
 522                           (unsigned int)smb_fname_parent->st.st_ex_uid,
 523                           strerror(errno) ));
 524         } else {
 525                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
 526                         "directory %s to parent directory uid %u.\n",
 527                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
 528                 /* Ensure the uid entry is updated. */
 529                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
 530         }
 531
 532  chdir:
 533         vfs_ChDir(conn,saved_dir);
 534  out:
 535         TALLOC_FREE(smb_fname_parent);
 536         TALLOC_FREE(smb_fname_cwd);
 537         return status;
 538 }
 539
 540 /****************************************************************************
 541  Open a file - returning a guaranteed ATOMIC indication of if the
 542  file was created or not.
 543 ****************************************************************************/
 544
 545 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
 546                         files_struct *fsp,
 547                         int flags,
 548                         mode_t mode,
 549                         bool *file_created)
 550 {
 551         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 552         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 553
 554         *file_created = false;
 555
 556         if (!(flags & O_CREAT)) {
 557                 /*
 558                  * We're not creating the file, just pass through.
 559                  */
 560                 return fd_open(conn, fsp, flags, mode);
 561         }
 562
 563         if (flags & O_EXCL) {
 564                 /*
 565                  * Fail if already exists, just pass through.
 566                  */
 567                 status = fd_open(conn, fsp, flags, mode);
 568
 569                 /*
 570                  * Here we've opened with O_CREAT|O_EXCL. If that went
 571                  * NT_STATUS_OK, we *know* we created this file.
 572                  */
 573                 *file_created = NT_STATUS_IS_OK(status);
 574
 575                 return status;
 576         }
 577
 578         /*
 579          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
 580          * To know absolutely if we created the file or not,
 581          * we can never call O_CREAT without O_EXCL. So if
 582          * we think the file existed, try without O_CREAT|O_EXCL.
 583          * If we think the file didn't exist, try with
 584          * O_CREAT|O_EXCL. Keep bouncing between these two
 585          * requests until either the file is created, or
 586          * opened. Either way, we keep going until we get
 587          * a returnable result (error, or open/create).
 588          */
 589
 590         while(1) {
 591                 int curr_flags = flags;
 592
 593                 if (file_existed) {
 594                         /* Just try open, do not create. */
 595                         curr_flags &= ~(O_CREAT);
 596                         status = fd_open(conn, fsp, curr_flags, mode);
 597                         if (NT_STATUS_EQUAL(status,
 598                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 599                                 /*
 600                                  * Someone deleted it in the meantime.
 601                                  * Retry with O_EXCL.
 602                                  */
 603                                 file_existed = false;
 604                                 DEBUG(10,("fd_open_atomic: file %s existed. "
 605                                         "Retry.\n",
 606                                         smb_fname_str_dbg(fsp->fsp_name)));
 607                                         continue;
 608                         }
 609                 } else {
 610                         /* Try create exclusively, fail if it exists. */
 611                         curr_flags |= O_EXCL;
 612                         status = fd_open(conn, fsp, curr_flags, mode);
 613                         if (NT_STATUS_EQUAL(status,
 614                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
 615                                 /*
 616                                  * Someone created it in the meantime.
 617                                  * Retry without O_CREAT.
 618                                  */
 619                                 file_existed = true;
 620                                 DEBUG(10,("fd_open_atomic: file %s "
 621                                         "did not exist. Retry.\n",
 622                                         smb_fname_str_dbg(fsp->fsp_name)));
 623                                 continue;
 624                         }
 625                         if (NT_STATUS_IS_OK(status)) {
 626                                 /*
 627                                  * Here we've opened with O_CREAT|O_EXCL
 628                                  * and got success. We *know* we created
 629                                  * this file.
 630                                  */
 631                                 *file_created = true;
 632                         }
 633                 }
 634                 /* Create is done, or failed. */
 635                 break;
 636         }
 637         return status;
 638 }
 639
 640 /****************************************************************************
 641  Open a file.
 642 ****************************************************************************/
 643
 644 static NTSTATUS open_file(files_struct *fsp,
 645                           connection_struct *conn,
 646                           struct smb_request *req,
 647                           const char *parent_dir,
 648                           int flags,
 649                           mode_t unx_mode,
 650                           uint32 access_mask, /* client requested access mask. */
 651                           uint32 open_access_mask, /* what we're actually using in the open. */
 652                           bool *p_file_created)
 653 {
 654         struct smb_filename *smb_fname = fsp->fsp_name;
 655         NTSTATUS status = NT_STATUS_OK;
 656         int accmode = (flags & O_ACCMODE);
 657         int local_flags = flags;
 658         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 659
 660         fsp->fh->fd = -1;
 661         errno = EPERM;
 662
 663         /* Check permissions */
 664
 665         /*
 666          * This code was changed after seeing a client open request
 667          * containing the open mode of (DENY_WRITE/read-only) with
 668          * the 'create if not exist' bit set. The previous code
 669          * would fail to open the file read only on a read-only share
 670          * as it was checking the flags parameter  directly against O_RDONLY,
 671          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
 672          * JRA.
 673          */
 674
 675         if (!CAN_WRITE(conn)) {
 676                 /* It's a read-only share - fail if we wanted to write. */
 677                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
 678                         DEBUG(3,("Permission denied opening %s\n",
 679                                  smb_fname_str_dbg(smb_fname)));
 680                         return NT_STATUS_ACCESS_DENIED;
 681                 }
 682                 if (flags & O_CREAT) {
 683                         /* We don't want to write - but we must make sure that
 684                            O_CREAT doesn't create the file if we have write
 685                            access into the directory.
 686                         */
 687                         flags &= ~(O_CREAT|O_EXCL);
 688                         local_flags &= ~(O_CREAT|O_EXCL);
 689                 }
 690         }
 691
 692         /*
 693          * This little piece of insanity is inspired by the
 694          * fact that an NT client can open a file for O_RDONLY,
 695          * but set the create disposition to FILE_EXISTS_TRUNCATE.
 696          * If the client *can* write to the file, then it expects to
 697          * truncate the file, even though it is opening for readonly.
 698          * Quicken uses this stupid trick in backup file creation...
 699          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
 700          * for helping track this one down. It didn't bite us in 2.0.x
 701          * as we always opened files read-write in that release. JRA.
 702          */
 703
 704         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
 705                 DEBUG(10,("open_file: truncate requested on read-only open "
 706                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
 707                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
 708         }
 709
 710         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
 711             (!file_existed && (local_flags & O_CREAT)) ||
 712             ((local_flags & O_TRUNC) == O_TRUNC) ) {
 713                 const char *wild;
 714                 int ret;
 715
 716 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
 717                 /*
 718                  * We would block on opening a FIFO with no one else on the
 719                  * other end. Do what we used to do and add O_NONBLOCK to the
 720                  * open flags. JRA.
 721                  */
 722
 723                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
 724                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
 725                         local_flags |= O_NONBLOCK;
 726                 }
 727 #endif
 728
 729                 /* Don't create files with Microsoft wildcard characters. */
 730                 if (fsp->base_fsp) {
 731                         /*
 732                          * wildcard characters are allowed in stream names
 733                          * only test the basefilename
 734                          */
 735                         wild = fsp->base_fsp->fsp_name->base_name;
 736                 } else {
 737                         wild = smb_fname->base_name;
 738                 }
 739                 if ((local_flags & O_CREAT) && !file_existed &&
 740                     ms_has_wild(wild))  {
 741                         return NT_STATUS_OBJECT_NAME_INVALID;
 742                 }
 743
 744                 /* Can we access this file ? */
 745                 if (!fsp->base_fsp) {
 746                         /* Only do this check on non-stream open. */
 747                         if (file_existed) {
 748                                 status = smbd_check_access_rights(conn,
 749                                                 smb_fname,
 750                                                 false,
 751                                                 access_mask);
 752                         } else if (local_flags & O_CREAT){
 753                                 status = check_parent_access(conn,
 754                                                 smb_fname,
 755                                                 SEC_DIR_ADD_FILE);
 756                         } else {
 757                                 /* File didn't exist and no O_CREAT. */
 758                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 759                         }
 760                         if (!NT_STATUS_IS_OK(status)) {
 761                                 DEBUG(10,("open_file: "
 762                                         "%s on file "
 763                                         "%s returned %s\n",
 764                                         file_existed ?
 765                                                 "smbd_check_access_rights" :
 766                                                 "check_parent_access",
 767                                         smb_fname_str_dbg(smb_fname),
 768                                         nt_errstr(status) ));
 769                                 return status;
 770                         }
 771                 }
 772
 773                 /* Actually do the open */
 774                 status = fd_open_atomic(conn, fsp, local_flags,
 775                                 unx_mode, p_file_created);
 776                 if (!NT_STATUS_IS_OK(status)) {
 777                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
 778                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
 779                                  nt_errstr(status),local_flags,flags));
 780                         return status;
 781                 }
 782
 783                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 784                 if (ret == -1) {
 785                         /* If we have an fd, this stat should succeed. */
 786                         DEBUG(0,("Error doing fstat on open file %s "
 787                                 "(%s)\n",
 788                                 smb_fname_str_dbg(smb_fname),
 789                                 strerror(errno) ));
 790                         status = map_nt_error_from_unix(errno);
 791                         fd_close(fsp);
 792                         return status;
 793                 }
 794
 795                 if (*p_file_created) {
 796                         /* We created this file. */
 797
 798                         bool need_re_stat = false;
 799                         /* Do all inheritance work after we've
 800                            done a successful fstat call and filled
 801                            in the stat struct in fsp->fsp_name. */
 802
 803                         /* Inherit the ACL if required */
 804                         if (lp_inherit_perms(SNUM(conn))) {
 805                                 inherit_access_posix_acl(conn, parent_dir,
 806                                                          smb_fname->base_name,
 807                                                          unx_mode);
 808                                 need_re_stat = true;
 809                         }
 810
 811                         /* Change the owner if required. */
 812                         if (lp_inherit_owner(SNUM(conn))) {
 813                                 change_file_owner_to_parent(conn, parent_dir,
 814                                                             fsp);
 815                                 need_re_stat = true;
 816                         }
 817
 818                         if (need_re_stat) {
 819                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 820                                 /* If we have an fd, this stat should succeed. */
 821                                 if (ret == -1) {
 822                                         DEBUG(0,("Error doing fstat on open file %s "
 823                                                  "(%s)\n",
 824                                                  smb_fname_str_dbg(smb_fname),
 825                                                  strerror(errno) ));
 826                                 }
 827                         }
 828
 829                         notify_fname(conn, NOTIFY_ACTION_ADDED,
 830                                      FILE_NOTIFY_CHANGE_FILE_NAME,
 831                                      smb_fname->base_name);
 832                 }
 833         } else {
 834                 fsp->fh->fd = -1; /* What we used to call a stat open. */
 835                 if (!file_existed) {
 836                         /* File must exist for a stat open. */
 837                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 838                 }
 839
 840                 status = smbd_check_access_rights(conn,
 841                                 smb_fname,
 842                                 false,
 843                                 access_mask);
 844
 845                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 846                                 fsp->posix_open &&
 847                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
 848                         /* This is a POSIX stat open for delete
 849                          * or rename on a symlink that points
 850                          * nowhere. Allow. */
 851                         DEBUG(10,("open_file: allowing POSIX "
 852                                   "open on bad symlink %s\n",
 853                                   smb_fname_str_dbg(smb_fname)));
 854                         status = NT_STATUS_OK;
 855                 }
 856
 857                 if (!NT_STATUS_IS_OK(status)) {
 858                         DEBUG(10,("open_file: "
 859                                 "smbd_check_access_rights on file "
 860                                 "%s returned %s\n",
 861                                 smb_fname_str_dbg(smb_fname),
 862                                 nt_errstr(status) ));
 863                         return status;
 864                 }
 865         }
 866
 867         /*
 868          * POSIX allows read-only opens of directories. We don't
 869          * want to do this (we use a different code path for this)
 870          * so catch a directory open and return an EISDIR. JRA.
 871          */
 872
 873         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
 874                 fd_close(fsp);
 875                 errno = EISDIR;
 876                 return NT_STATUS_FILE_IS_A_DIRECTORY;
 877         }
 878
 879         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 880         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
 881         fsp->file_pid = req ? req->smbpid : 0;
 882         fsp->can_lock = True;
 883         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
 884         fsp->can_write =
 885                 CAN_WRITE(conn) &&
 886                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
 887         fsp->print_file = NULL;
 888         fsp->modified = False;
 889         fsp->sent_oplock_break = NO_BREAK_SENT;
 890         fsp->is_directory = False;
 891         if (conn->aio_write_behind_list &&
 892             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
 893                        conn->case_sensitive)) {
 894                 fsp->aio_write_behind = True;
 895         }
 896
 897         fsp->wcp = NULL; /* Write cache pointer. */
 898
 899         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
 900                  conn->session_info->unix_info->unix_name,
 901                  smb_fname_str_dbg(smb_fname),
 902                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
 903                  conn->num_files_open));
 904
 905         errno = 0;
 906         return NT_STATUS_OK;
 907 }
 908
 909 /****************************************************************************
 910  Check if we can open a file with a share mode.
 911  Returns True if conflict, False if not.
 912 ****************************************************************************/
 913
 914 static bool share_conflict(struct share_mode_entry *entry,
 915                            uint32 access_mask,
 916                            uint32 share_access)
 917 {
 918         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
 919                   "entry->share_access = 0x%x, "
 920                   "entry->private_options = 0x%x\n",
 921                   (unsigned int)entry->access_mask,
 922                   (unsigned int)entry->share_access,
 923                   (unsigned int)entry->private_options));
 924
 925         if (server_id_is_disconnected(&entry->pid)) {
 926                 /*
 927                  * note: cleanup should have been done by
 928                  * delay_for_batch_oplocks()
 929                  */
 930                 return false;
 931         }
 932
 933         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
 934                   (unsigned int)access_mask, (unsigned int)share_access));
 935
 936         if ((entry->access_mask & (FILE_WRITE_DATA|
 937                                    FILE_APPEND_DATA|
 938                                    FILE_READ_DATA|
 939                                    FILE_EXECUTE|
 940                                    DELETE_ACCESS)) == 0) {
 941                 DEBUG(10,("share_conflict: No conflict due to "
 942                           "entry->access_mask = 0x%x\n",
 943                           (unsigned int)entry->access_mask ));
 944                 return False;
 945         }
 946
 947         if ((access_mask & (FILE_WRITE_DATA|
 948                             FILE_APPEND_DATA|
 949                             FILE_READ_DATA|
 950                             FILE_EXECUTE|
 951                             DELETE_ACCESS)) == 0) {
 952                 DEBUG(10,("share_conflict: No conflict due to "
 953                           "access_mask = 0x%x\n",
 954                           (unsigned int)access_mask ));
 955                 return False;
 956         }
 957
 958 #if 1 /* JRA TEST - Superdebug. */
 959 #define CHECK_MASK(num, am, right, sa, share) \
 960         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
 961                 (unsigned int)(num), (unsigned int)(am), \
 962                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
 963         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
 964                 (unsigned int)(num), (unsigned int)(sa), \
 965                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
 966         if (((am) & (right)) && !((sa) & (share))) { \
 967                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
 968 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
 969                         (unsigned int)(share) )); \
 970                 return True; \
 971         }
 972 #else
 973 #define CHECK_MASK(num, am, right, sa, share) \
 974         if (((am) & (right)) && !((sa) & (share))) { \
 975                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
 976 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
 977                         (unsigned int)(share) )); \
 978                 return True; \
 979         }
 980 #endif
 981
 982         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
 983                    share_access, FILE_SHARE_WRITE);
 984         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
 985                    entry->share_access, FILE_SHARE_WRITE);
 986
 987         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
 988                    share_access, FILE_SHARE_READ);
 989         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
 990                    entry->share_access, FILE_SHARE_READ);
 991
 992         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
 993                    share_access, FILE_SHARE_DELETE);
 994         CHECK_MASK(6, access_mask, DELETE_ACCESS,
 995                    entry->share_access, FILE_SHARE_DELETE);
 996
 997         DEBUG(10,("share_conflict: No conflict.\n"));
 998         return False;
 999 }
1000
1001 #if defined(DEVELOPER)
1002 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1003                                       int num,
1004                                       struct share_mode_entry *share_entry)
1005 {
1006         struct server_id self = messaging_server_id(sconn->msg_ctx);
1007         files_struct *fsp;
1008
1009         if (!serverid_equal(&self, &share_entry->pid)) {
1010                 return;
1011         }
1012
1013         if (is_deferred_open_entry(share_entry) &&
1014             !open_was_deferred(sconn, share_entry->op_mid)) {
1015                 char *str = talloc_asprintf(talloc_tos(),
1016                         "Got a deferred entry without a request: "
1017                         "PANIC: %s\n",
1018                         share_mode_str(talloc_tos(), num, share_entry));
1019                 smb_panic(str);
1020         }
1021
1022         if (!is_valid_share_mode_entry(share_entry)) {
1023                 return;
1024         }
1025
1026         fsp = file_find_dif(sconn, share_entry->id,
1027                             share_entry->share_file_id);
1028         if (!fsp) {
1029                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1030                          share_mode_str(talloc_tos(), num, share_entry) ));
1031                 smb_panic("validate_my_share_entries: Cannot match a "
1032                           "share entry with an open file\n");
1033         }
1034
1035         if (is_deferred_open_entry(share_entry)) {
1036                 goto panic;
1037         }
1038
1039         if ((share_entry->op_type == NO_OPLOCK) &&
1040             (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK)) {
1041                 /* Someone has already written to it, but I haven't yet
1042                  * noticed */
1043                 return;
1044         }
1045
1046         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1047                 goto panic;
1048         }
1049
1050         return;
1051
1052  panic:
1053         {
1054                 char *str;
1055                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1056                          share_mode_str(talloc_tos(), num, share_entry) ));
1057                 str = talloc_asprintf(talloc_tos(),
1058                         "validate_my_share_entries: "
1059                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1060                          fsp->fsp_name->base_name,
1061                          (unsigned int)fsp->oplock_type,
1062                          (unsigned int)share_entry->op_type );
1063                 smb_panic(str);
1064         }
1065 }
1066 #endif
1067
1068 bool is_stat_open(uint32 access_mask)
1069 {
1070         const uint32_t stat_open_bits =
1071                 (SYNCHRONIZE_ACCESS|
1072                  FILE_READ_ATTRIBUTES|
1073                  FILE_WRITE_ATTRIBUTES);
1074
1075         return (((access_mask &  stat_open_bits) != 0) &&
1076                 ((access_mask & ~stat_open_bits) == 0));
1077 }
1078
1079 /****************************************************************************
1080  Deal with share modes
1081  Invarient: Share mode must be locked on entry and exit.
1082  Returns -1 on error, or number of share modes on success (may be zero).
1083 ****************************************************************************/
1084
1085 static NTSTATUS open_mode_check(connection_struct *conn,
1086                                 struct share_mode_lock *lck,
1087                                 uint32_t name_hash,
1088                                 uint32 access_mask,
1089                                 uint32 share_access,
1090                                 uint32 create_options,
1091                                 bool *file_existed)
1092 {
1093         int i;
1094
1095         if(lck->data->num_share_modes == 0) {
1096                 return NT_STATUS_OK;
1097         }
1098
1099         /* A delete on close prohibits everything */
1100
1101         if (is_delete_on_close_set(lck, name_hash)) {
1102                 /*
1103                  * Check the delete on close token
1104                  * is valid. It could have been left
1105                  * after a server crash.
1106                  */
1107                 for(i = 0; i < lck->data->num_share_modes; i++) {
1108                         if (!share_mode_stale_pid(lck->data, i)) {
1109
1110                                 *file_existed = true;
1111
1112                                 return NT_STATUS_DELETE_PENDING;
1113                         }
1114                 }
1115                 return NT_STATUS_OK;
1116         }
1117
1118         if (is_stat_open(access_mask)) {
1119                 /* Stat open that doesn't trigger oplock breaks or share mode
1120                  * checks... ! JRA. */
1121                 return NT_STATUS_OK;
1122         }
1123
1124         /*
1125          * Check if the share modes will give us access.
1126          */
1127
1128 #if defined(DEVELOPER)
1129         for(i = 0; i < lck->data->num_share_modes; i++) {
1130                 validate_my_share_entries(conn->sconn, i,
1131                                           &lck->data->share_modes[i]);
1132         }
1133 #endif
1134
1135         /* Now we check the share modes, after any oplock breaks. */
1136         for(i = 0; i < lck->data->num_share_modes; i++) {
1137
1138                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1139                         continue;
1140                 }
1141
1142                 /* someone else has a share lock on it, check to see if we can
1143                  * too */
1144                 if (share_conflict(&lck->data->share_modes[i],
1145                                    access_mask, share_access)) {
1146
1147                         if (share_mode_stale_pid(lck->data, i)) {
1148                                 continue;
1149                         }
1150
1151                         *file_existed = true;
1152
1153                         return NT_STATUS_SHARING_VIOLATION;
1154                 }
1155         }
1156
1157         if (lck->data->num_share_modes != 0) {
1158                 *file_existed = true;
1159         }
1160
1161         return NT_STATUS_OK;
1162 }
1163
1164 /*
1165  * Send a break message to the oplock holder and delay the open for
1166  * our client.
1167  */
1168
1169 static NTSTATUS send_break_message(files_struct *fsp,
1170                                         struct share_mode_entry *exclusive,
1171                                         uint64_t mid,
1172                                         int oplock_request)
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         exclusive->op_mid = mid;
1180
1181         /* Create the message. */
1182         share_mode_entry_to_message(msg, exclusive);
1183
1184         /* Add in the FORCE_OPLOCK_BREAK_TO_NONE bit in the message if set. We
1185            don't want this set in the share mode struct pointed to by lck. */
1186
1187         if (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE) {
1188                 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,
1189                         exclusive->op_type | FORCE_OPLOCK_BREAK_TO_NONE);
1190         }
1191
1192         status = messaging_send_buf(fsp->conn->sconn->msg_ctx, exclusive->pid,
1193                                     MSG_SMB_BREAK_REQUEST,
1194                                     (uint8 *)msg,
1195                                     MSG_SMB_SHARE_MODE_ENTRY_SIZE);
1196         if (!NT_STATUS_IS_OK(status)) {
1197                 DEBUG(3, ("Could not send oplock break message: %s\n",
1198                           nt_errstr(status)));
1199         }
1200
1201         return status;
1202 }
1203
1204 /*
1205  * Return share_mode_entry pointers for :
1206  * 1). Batch oplock entry.
1207  * 2). Batch or exclusive oplock entry (may be identical to #1).
1208  * bool have_level2_oplock
1209  * bool have_no_oplock.
1210  * Do internal consistency checks on the share mode for a file.
1211  */
1212
1213 static void find_oplock_types(files_struct *fsp,
1214                                 int oplock_request,
1215                                 const struct share_mode_lock *lck,
1216                                 struct share_mode_entry **pp_batch,
1217                                 struct share_mode_entry **pp_ex_or_batch,
1218                                 bool *got_level2,
1219                                 bool *got_no_oplock)
1220 {
1221         int i;
1222
1223         *pp_batch = NULL;
1224         *pp_ex_or_batch = NULL;
1225         *got_level2 = false;
1226         *got_no_oplock = false;
1227
1228         /* Ignore stat or internal opens, as is done in
1229                 delay_for_batch_oplocks() and
1230                 delay_for_exclusive_oplocks().
1231          */
1232         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1233                 return;
1234         }
1235
1236         for (i=0; i<lck->data->num_share_modes; i++) {
1237                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1238                         continue;
1239                 }
1240
1241                 if (lck->data->share_modes[i].op_type == NO_OPLOCK &&
1242                                 is_stat_open(lck->data->share_modes[i].access_mask)) {
1243                         /* We ignore stat opens in the table - they
1244                            always have NO_OPLOCK and never get or
1245                            cause breaks. JRA. */
1246                         continue;
1247                 }
1248
1249                 if (BATCH_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1250                         /* batch - can only be one. */
1251                         if (share_mode_stale_pid(lck->data, i)) {
1252                                 DEBUG(10, ("Found stale batch oplock\n"));
1253                                 continue;
1254                         }
1255                         if (*pp_ex_or_batch || *pp_batch || *got_level2 || *got_no_oplock) {
1256                                 smb_panic("Bad batch oplock entry.");
1257                         }
1258                         *pp_batch = &lck->data->share_modes[i];
1259                 }
1260
1261                 if (EXCLUSIVE_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1262                         if (share_mode_stale_pid(lck->data, i)) {
1263                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1264                                 continue;
1265                         }
1266                         /* Exclusive or batch - can only be one. */
1267                         if (*pp_ex_or_batch || *got_level2 || *got_no_oplock) {
1268                                 smb_panic("Bad exclusive or batch oplock entry.");
1269                         }
1270                         *pp_ex_or_batch = &lck->data->share_modes[i];
1271                 }
1272
1273                 if (LEVEL_II_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1274                         if (*pp_batch || *pp_ex_or_batch) {
1275                                 if (share_mode_stale_pid(lck->data, i)) {
1276                                         DEBUG(10, ("Found stale LevelII "
1277                                                    "oplock\n"));
1278                                         continue;
1279                                 }
1280                                 smb_panic("Bad levelII oplock entry.");
1281                         }
1282                         *got_level2 = true;
1283                 }
1284
1285                 if (lck->data->share_modes[i].op_type == NO_OPLOCK) {
1286                         if (*pp_batch || *pp_ex_or_batch) {
1287                                 if (share_mode_stale_pid(lck->data, i)) {
1288                                         DEBUG(10, ("Found stale NO_OPLOCK "
1289                                                    "entry\n"));
1290                                         continue;
1291                                 }
1292                                 smb_panic("Bad no oplock entry.");
1293                         }
1294                         *got_no_oplock = true;
1295                 }
1296         }
1297 }
1298
1299 static bool delay_for_batch_oplocks(files_struct *fsp,
1300                                         uint64_t mid,
1301                                         int oplock_request,
1302                                         struct share_mode_entry *batch_entry)
1303 {
1304         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1305                 return false;
1306         }
1307         if (batch_entry == NULL) {
1308                 return false;
1309         }
1310
1311         if (server_id_is_disconnected(&batch_entry->pid)) {
1312                 /*
1313                  * TODO: clean up.
1314                  * This could be achieved by sending a break message
1315                  * to ourselves. Special considerations for files
1316                  * with delete_on_close flag set!
1317                  *
1318                  * For now we keep it simple and do not
1319                  * allow delete on close for durable handles.
1320                  */
1321                 return false;
1322         }
1323
1324         /* Found a batch oplock */
1325         send_break_message(fsp, batch_entry, mid, oplock_request);
1326         return true;
1327 }
1328
1329 static bool delay_for_exclusive_oplocks(files_struct *fsp,
1330                                         uint64_t mid,
1331                                         int oplock_request,
1332                                         struct share_mode_entry *ex_entry)
1333 {
1334         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1335                 return false;
1336         }
1337         if (ex_entry == NULL) {
1338                 return false;
1339         }
1340
1341         if (server_id_is_disconnected(&ex_entry->pid)) {
1342                 /*
1343                  * since only durable handles can get disconnected,
1344                  * and we can only get durable handles with batch oplocks,
1345                  * this should actually never be reached...
1346                  */
1347                 return false;
1348         }
1349
1350         send_break_message(fsp, ex_entry, mid, oplock_request);
1351         return true;
1352 }
1353
1354 static bool file_has_brlocks(files_struct *fsp)
1355 {
1356         struct byte_range_lock *br_lck;
1357
1358         br_lck = brl_get_locks_readonly(fsp);
1359         if (!br_lck)
1360                 return false;
1361
1362         return br_lck->num_locks > 0 ? true : false;
1363 }
1364
1365 static void grant_fsp_oplock_type(files_struct *fsp,
1366                                 int oplock_request,
1367                                 bool got_level2_oplock,
1368                                 bool got_a_none_oplock)
1369 {
1370         bool allow_level2 = (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1371                             lp_level2_oplocks(SNUM(fsp->conn));
1372
1373         /* Start by granting what the client asked for,
1374            but ensure no SAMBA_PRIVATE bits can be set. */
1375         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1376
1377         if (oplock_request & INTERNAL_OPEN_ONLY) {
1378                 /* No oplocks on internal open. */
1379                 fsp->oplock_type = NO_OPLOCK;
1380                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1381                         fsp->oplock_type, fsp_str_dbg(fsp)));
1382                 return;
1383         }
1384
1385         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1386                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1387                         fsp_str_dbg(fsp)));
1388                 fsp->oplock_type = NO_OPLOCK;
1389         }
1390
1391         if (is_stat_open(fsp->access_mask)) {
1392                 /* Leave the value already set. */
1393                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1394                         fsp->oplock_type, fsp_str_dbg(fsp)));
1395                 return;
1396         }
1397
1398         /*
1399          * Match what was requested (fsp->oplock_type) with
1400          * what was found in the existing share modes.
1401          */
1402
1403         if (got_a_none_oplock) {
1404                 fsp->oplock_type = NO_OPLOCK;
1405         } else if (got_level2_oplock) {
1406                 if (fsp->oplock_type == NO_OPLOCK ||
1407                                 fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
1408                         /* Store a level2 oplock, but don't tell the client */
1409                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1410                 } else {
1411                         fsp->oplock_type = LEVEL_II_OPLOCK;
1412                 }
1413         } else {
1414                 /* All share_mode_entries are placeholders or deferred.
1415                  * Silently upgrade to fake levelII if the client didn't
1416                  * ask for an oplock. */
1417                 if (fsp->oplock_type == NO_OPLOCK) {
1418                         /* Store a level2 oplock, but don't tell the client */
1419                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1420                 }
1421         }
1422
1423         /*
1424          * Don't grant level2 to clients that don't want them
1425          * or if we've turned them off.
1426          */
1427         if (fsp->oplock_type == LEVEL_II_OPLOCK && !allow_level2) {
1428                 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1429         }
1430
1431         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1432                   fsp->oplock_type, fsp_str_dbg(fsp)));
1433 }
1434
1435 static bool request_timed_out(struct timeval request_time,
1436                               struct timeval timeout)
1437 {
1438         struct timeval now, end_time;
1439         GetTimeOfDay(&now);
1440         end_time = timeval_sum(&request_time, &timeout);
1441         return (timeval_compare(&end_time, &now) < 0);
1442 }
1443
1444 /****************************************************************************
1445  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1446 ****************************************************************************/
1447
1448 static void defer_open(struct share_mode_lock *lck,
1449                        struct timeval request_time,
1450                        struct timeval timeout,
1451                        struct smb_request *req,
1452                        struct deferred_open_record *state)
1453 {
1454         struct server_id self = messaging_server_id(req->sconn->msg_ctx);
1455
1456         /* Paranoia check */
1457
1458         if (lck) {
1459                 int i;
1460
1461                 for (i=0; i<lck->data->num_share_modes; i++) {
1462                         struct share_mode_entry *e = &lck->data->share_modes[i];
1463
1464                         if (is_deferred_open_entry(e) &&
1465                             serverid_equal(&self, &e->pid) &&
1466                             (e->op_mid == req->mid)) {
1467                                 DEBUG(0, ("Trying to defer an already deferred "
1468                                         "request: mid=%llu, exiting\n",
1469                                         (unsigned long long)req->mid));
1470                                 TALLOC_FREE(lck);
1471                                 exit_server("attempt to defer a deferred request");
1472                         }
1473                 }
1474         }
1475
1476         /* End paranoia check */
1477
1478         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1479                   "open entry for mid %llu\n",
1480                   (unsigned int)request_time.tv_sec,
1481                   (unsigned int)request_time.tv_usec,
1482                   (unsigned long long)req->mid));
1483
1484         if (!push_deferred_open_message_smb(req, request_time, timeout,
1485                                        state->id, (char *)state, sizeof(*state))) {
1486                 TALLOC_FREE(lck);
1487                 exit_server("push_deferred_open_message_smb failed");
1488         }
1489         if (lck) {
1490                 add_deferred_open(lck, req->mid, request_time, self, state->id);
1491         }
1492 }
1493
1494
1495 /****************************************************************************
1496  On overwrite open ensure that the attributes match.
1497 ****************************************************************************/
1498
1499 static bool open_match_attributes(connection_struct *conn,
1500                                   uint32 old_dos_attr,
1501                                   uint32 new_dos_attr,
1502                                   mode_t existing_unx_mode,
1503                                   mode_t new_unx_mode,
1504                                   mode_t *returned_unx_mode)
1505 {
1506         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1507
1508         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1509         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1510
1511         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
1512            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
1513                 *returned_unx_mode = new_unx_mode;
1514         } else {
1515                 *returned_unx_mode = (mode_t)0;
1516         }
1517
1518         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
1519                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
1520                   "returned_unx_mode = 0%o\n",
1521                   (unsigned int)old_dos_attr,
1522                   (unsigned int)existing_unx_mode,
1523                   (unsigned int)new_dos_attr,
1524                   (unsigned int)*returned_unx_mode ));
1525
1526         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
1527         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1528                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
1529                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
1530                         return False;
1531                 }
1532         }
1533         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1534                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
1535                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
1536                         return False;
1537                 }
1538         }
1539         return True;
1540 }
1541
1542 /****************************************************************************
1543  Special FCB or DOS processing in the case of a sharing violation.
1544  Try and find a duplicated file handle.
1545 ****************************************************************************/
1546
1547 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
1548                                 connection_struct *conn,
1549                                 files_struct *fsp_to_dup_into,
1550                                 const struct smb_filename *smb_fname,
1551                                 struct file_id id,
1552                                 uint16 file_pid,
1553                                 uint64_t vuid,
1554                                 uint32 access_mask,
1555                                 uint32 share_access,
1556                                 uint32 create_options)
1557 {
1558         files_struct *fsp;
1559
1560         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
1561                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
1562
1563         for(fsp = file_find_di_first(conn->sconn, id); fsp;
1564             fsp = file_find_di_next(fsp)) {
1565
1566                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
1567                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
1568                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
1569                           fsp->fh->fd, (unsigned long long)fsp->vuid,
1570                           (unsigned int)fsp->file_pid,
1571                           (unsigned int)fsp->fh->private_options,
1572                           (unsigned int)fsp->access_mask ));
1573
1574                 if (fsp != fsp_to_dup_into &&
1575                     fsp->fh->fd != -1 &&
1576                     fsp->vuid == vuid &&
1577                     fsp->file_pid == file_pid &&
1578                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
1579                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
1580                     (fsp->access_mask & FILE_WRITE_DATA) &&
1581                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
1582                     strequal(fsp->fsp_name->stream_name,
1583                              smb_fname->stream_name)) {
1584                         DEBUG(10,("fcb_or_dos_open: file match\n"));
1585                         break;
1586                 }
1587         }
1588
1589         if (!fsp) {
1590                 return NT_STATUS_NOT_FOUND;
1591         }
1592
1593         /* quite an insane set of semantics ... */
1594         if (is_executable(smb_fname->base_name) &&
1595             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
1596                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
1597                 return NT_STATUS_INVALID_PARAMETER;
1598         }
1599
1600         /* We need to duplicate this fsp. */
1601         return dup_file_fsp(req, fsp, access_mask, share_access,
1602                             create_options, fsp_to_dup_into);
1603 }
1604
1605 static void schedule_defer_open(struct share_mode_lock *lck,
1606                                 struct timeval request_time,
1607                                 struct smb_request *req)
1608 {
1609         struct deferred_open_record state;
1610
1611         /* This is a relative time, added to the absolute
1612            request_time value to get the absolute timeout time.
1613            Note that if this is the second or greater time we enter
1614            this codepath for this particular request mid then
1615            request_time is left as the absolute time of the *first*
1616            time this request mid was processed. This is what allows
1617            the request to eventually time out. */
1618
1619         struct timeval timeout;
1620
1621         /* Normally the smbd we asked should respond within
1622          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
1623          * the client did, give twice the timeout as a safety
1624          * measure here in case the other smbd is stuck
1625          * somewhere else. */
1626
1627         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
1628
1629         /* Nothing actually uses state.delayed_for_oplocks
1630            but it's handy to differentiate in debug messages
1631            between a 30 second delay due to oplock break, and
1632            a 1 second delay for share mode conflicts. */
1633
1634         state.delayed_for_oplocks = True;
1635         state.async_open = false;
1636         state.id = lck->data->id;
1637
1638         if (!request_timed_out(request_time, timeout)) {
1639                 defer_open(lck, request_time, timeout, req, &state);
1640         }
1641 }
1642
1643 /****************************************************************************
1644  Reschedule an open call that went asynchronous.
1645 ****************************************************************************/
1646
1647 static void schedule_async_open(struct timeval request_time,
1648                                 struct smb_request *req)
1649 {
1650         struct deferred_open_record state;
1651         struct timeval timeout;
1652
1653         timeout = timeval_set(20, 0);
1654
1655         ZERO_STRUCT(state);
1656         state.delayed_for_oplocks = false;
1657         state.async_open = true;
1658
1659         if (!request_timed_out(request_time, timeout)) {
1660                 defer_open(NULL, request_time, timeout, req, &state);
1661         }
1662 }
1663
1664 /****************************************************************************
1665  Work out what access_mask to use from what the client sent us.
1666 ****************************************************************************/
1667
1668 static NTSTATUS smbd_calculate_maximum_allowed_access(
1669         connection_struct *conn,
1670         const struct smb_filename *smb_fname,
1671         bool use_privs,
1672         uint32_t *p_access_mask)
1673 {
1674         struct security_descriptor *sd;
1675         uint32_t access_granted;
1676         NTSTATUS status;
1677
1678         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
1679                 *p_access_mask |= FILE_GENERIC_ALL;
1680                 return NT_STATUS_OK;
1681         }
1682
1683         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
1684                                     (SECINFO_OWNER |
1685                                      SECINFO_GROUP |
1686                                      SECINFO_DACL),&sd);
1687
1688         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1689                 /*
1690                  * File did not exist
1691                  */
1692                 *p_access_mask = FILE_GENERIC_ALL;
1693                 return NT_STATUS_OK;
1694         }
1695         if (!NT_STATUS_IS_OK(status)) {
1696                 DEBUG(10,("Could not get acl on file %s: %s\n",
1697                           smb_fname_str_dbg(smb_fname),
1698                           nt_errstr(status)));
1699                 return NT_STATUS_ACCESS_DENIED;
1700         }
1701
1702         /*
1703          * Never test FILE_READ_ATTRIBUTES. se_file_access_check()
1704          * also takes care of owner WRITE_DAC and READ_CONTROL.
1705          */
1706         status = se_file_access_check(sd,
1707                                  get_current_nttok(conn),
1708                                  use_privs,
1709                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
1710                                  &access_granted);
1711
1712         TALLOC_FREE(sd);
1713
1714         if (!NT_STATUS_IS_OK(status)) {
1715                 DEBUG(10, ("Access denied on file %s: "
1716                            "when calculating maximum access\n",
1717                            smb_fname_str_dbg(smb_fname)));
1718                 return NT_STATUS_ACCESS_DENIED;
1719         }
1720         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
1721
1722         if (!(access_granted & DELETE_ACCESS)) {
1723                 if (can_delete_file_in_directory(conn, smb_fname)) {
1724                         *p_access_mask |= DELETE_ACCESS;
1725                 }
1726         }
1727
1728         return NT_STATUS_OK;
1729 }
1730
1731 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
1732                                     const struct smb_filename *smb_fname,
1733                                     bool use_privs,
1734                                     uint32_t access_mask,
1735                                     uint32_t *access_mask_out)
1736 {
1737         NTSTATUS status;
1738         uint32_t orig_access_mask = access_mask;
1739         uint32_t rejected_share_access;
1740
1741         /*
1742          * Convert GENERIC bits to specific bits.
1743          */
1744
1745         se_map_generic(&access_mask, &file_generic_mapping);
1746
1747         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
1748         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
1749
1750                 status = smbd_calculate_maximum_allowed_access(
1751                         conn, smb_fname, use_privs, &access_mask);
1752
1753                 if (!NT_STATUS_IS_OK(status)) {
1754                         return status;
1755                 }
1756
1757                 access_mask &= conn->share_access;
1758         }
1759
1760         rejected_share_access = access_mask & ~(conn->share_access);
1761
1762         if (rejected_share_access) {
1763                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
1764                         "file %s: rejected by share access mask[0x%08X] "
1765                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
1766                         smb_fname_str_dbg(smb_fname),
1767                         conn->share_access,
1768                         orig_access_mask, access_mask,
1769                         rejected_share_access));
1770                 return NT_STATUS_ACCESS_DENIED;
1771         }
1772
1773         *access_mask_out = access_mask;
1774         return NT_STATUS_OK;
1775 }
1776
1777 /****************************************************************************
1778  Remove the deferred open entry under lock.
1779 ****************************************************************************/
1780
1781 void remove_deferred_open_entry(struct file_id id, uint64_t mid,
1782                                 struct server_id pid)
1783 {
1784         struct share_mode_lock *lck = get_existing_share_mode_lock(
1785                 talloc_tos(), id);
1786         if (lck == NULL) {
1787                 DEBUG(0, ("could not get share mode lock\n"));
1788                 return;
1789         }
1790         del_deferred_open_entry(lck, mid, pid);
1791         TALLOC_FREE(lck);
1792 }
1793
1794 /****************************************************************************
1795  Return true if this is a state pointer to an asynchronous create.
1796 ****************************************************************************/
1797
1798 bool is_deferred_open_async(const void *ptr)
1799 {
1800         const struct deferred_open_record *state = (const struct deferred_open_record *)ptr;
1801
1802         return state->async_open;
1803 }
1804
1805 static bool clear_ads(uint32_t create_disposition)
1806 {
1807         bool ret = false;
1808
1809         switch (create_disposition) {
1810         case FILE_SUPERSEDE:
1811         case FILE_OVERWRITE_IF:
1812         case FILE_OVERWRITE:
1813                 ret = true;
1814                 break;
1815         default:
1816                 break;
1817         }
1818         return ret;
1819 }
1820
1821 static int disposition_to_open_flags(uint32_t create_disposition)
1822 {
1823         int ret = 0;
1824
1825         /*
1826          * Currently we're using FILE_SUPERSEDE as the same as
1827          * FILE_OVERWRITE_IF but they really are
1828          * different. FILE_SUPERSEDE deletes an existing file
1829          * (requiring delete access) then recreates it.
1830          */
1831
1832         switch (create_disposition) {
1833         case FILE_SUPERSEDE:
1834         case FILE_OVERWRITE_IF:
1835                 /*
1836                  * If file exists replace/overwrite. If file doesn't
1837                  * exist create.
1838                  */
1839                 ret = O_CREAT|O_TRUNC;
1840                 break;
1841
1842         case FILE_OPEN:
1843                 /*
1844                  * If file exists open. If file doesn't exist error.
1845                  */
1846                 ret = 0;
1847                 break;
1848
1849         case FILE_OVERWRITE:
1850                 /*
1851                  * If file exists overwrite. If file doesn't exist
1852                  * error.
1853                  */
1854                 ret = O_TRUNC;
1855                 break;
1856
1857         case FILE_CREATE:
1858                 /*
1859                  * If file exists error. If file doesn't exist create.
1860                  */
1861                 ret = O_CREAT|O_EXCL;
1862                 break;
1863
1864         case FILE_OPEN_IF:
1865                 /*
1866                  * If file exists open. If file doesn't exist create.
1867                  */
1868                 ret = O_CREAT;
1869                 break;
1870         }
1871         return ret;
1872 }
1873
1874 static int calculate_open_access_flags(uint32_t access_mask,
1875                                        int oplock_request,
1876                                        uint32_t private_flags)
1877 {
1878         bool need_write, need_read;
1879
1880         /*
1881          * Note that we ignore the append flag as append does not
1882          * mean the same thing under DOS and Unix.
1883          */
1884
1885         need_write =
1886                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ||
1887                  (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE));
1888
1889         if (!need_write) {
1890                 return O_RDONLY;
1891         }
1892
1893         /* DENY_DOS opens are always underlying read-write on the
1894            file handle, no matter what the requested access mask
1895            says. */
1896
1897         need_read =
1898                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
1899                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
1900                                 FILE_READ_EA|FILE_EXECUTE));
1901
1902         if (!need_read) {
1903                 return O_WRONLY;
1904         }
1905         return O_RDWR;
1906 }
1907
1908 /****************************************************************************
1909  Open a file with a share mode. Passed in an already created files_struct *.
1910 ****************************************************************************/
1911
1912 static NTSTATUS open_file_ntcreate(connection_struct *conn,
1913                             struct smb_request *req,
1914                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
1915                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
1916                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
1917                             uint32 create_options,      /* options such as delete on close. */
1918                             uint32 new_dos_attributes,  /* attributes used for new file. */
1919                             int oplock_request,         /* internal Samba oplock codes. */
1920                                                         /* Information (FILE_EXISTS etc.) */
1921                             uint32_t private_flags,     /* Samba specific flags. */
1922                             int *pinfo,
1923                             files_struct *fsp)
1924 {
1925         struct smb_filename *smb_fname = fsp->fsp_name;
1926         int flags=0;
1927         int flags2=0;
1928         bool file_existed = VALID_STAT(smb_fname->st);
1929         bool def_acl = False;
1930         bool posix_open = False;
1931         bool new_file_created = False;
1932         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
1933         mode_t new_unx_mode = (mode_t)0;
1934         mode_t unx_mode = (mode_t)0;
1935         int info;
1936         uint32 existing_dos_attributes = 0;
1937         struct timeval request_time = timeval_zero();
1938         struct share_mode_lock *lck = NULL;
1939         uint32 open_access_mask = access_mask;
1940         NTSTATUS status;
1941         char *parent_dir;
1942         SMB_STRUCT_STAT saved_stat = smb_fname->st;
1943
1944         if (conn->printer) {
1945                 /*
1946                  * Printers are handled completely differently.
1947                  * Most of the passed parameters are ignored.
1948                  */
1949
1950                 if (pinfo) {
1951                         *pinfo = FILE_WAS_CREATED;
1952                 }
1953
1954                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
1955                            smb_fname_str_dbg(smb_fname)));
1956
1957                 if (!req) {
1958                         DEBUG(0,("open_file_ntcreate: printer open without "
1959                                 "an SMB request!\n"));
1960                         return NT_STATUS_INTERNAL_ERROR;
1961                 }
1962
1963                 return print_spool_open(fsp, smb_fname->base_name,
1964                                         req->vuid);
1965         }
1966
1967         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
1968                             NULL)) {
1969                 return NT_STATUS_NO_MEMORY;
1970         }
1971
1972         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
1973                 posix_open = True;
1974                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
1975                 new_dos_attributes = 0;
1976         } else {
1977                 /* Windows allows a new file to be created and
1978                    silently removes a FILE_ATTRIBUTE_DIRECTORY
1979                    sent by the client. Do the same. */
1980
1981                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
1982
1983                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
1984                  * created new. */
1985                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
1986                                      smb_fname, parent_dir);
1987         }
1988
1989         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
1990                    "access_mask=0x%x share_access=0x%x "
1991                    "create_disposition = 0x%x create_options=0x%x "
1992                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
1993                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
1994                    access_mask, share_access, create_disposition,
1995                    create_options, (unsigned int)unx_mode, oplock_request,
1996                    (unsigned int)private_flags));
1997
1998         if ((req == NULL) && ((oplock_request & INTERNAL_OPEN_ONLY) == 0)) {
1999                 DEBUG(0, ("No smb request but not an internal only open!\n"));
2000                 return NT_STATUS_INTERNAL_ERROR;
2001         }
2002
2003         /*
2004          * Only non-internal opens can be deferred at all
2005          */
2006
2007         if (req) {
2008                 void *ptr;
2009                 if (get_deferred_open_message_state(req,
2010                                 &request_time,
2011                                 &ptr)) {
2012                         /* Remember the absolute time of the original
2013                            request with this mid. We'll use it later to
2014                            see if this has timed out. */
2015
2016                         /* If it was an async create retry, the file
2017                            didn't exist. */
2018
2019                         if (is_deferred_open_async(ptr)) {
2020                                 SET_STAT_INVALID(smb_fname->st);
2021                                 file_existed = false;
2022                         } else {
2023                                 struct deferred_open_record *state = (struct deferred_open_record *)ptr;
2024                                 /* Remove the deferred open entry under lock. */
2025                                 remove_deferred_open_entry(
2026                                         state->id, req->mid,
2027                                         messaging_server_id(req->sconn->msg_ctx));
2028                         }
2029
2030                         /* Ensure we don't reprocess this message. */
2031                         remove_deferred_open_message_smb(req->sconn, req->mid);
2032                 }
2033         }
2034
2035         if (!posix_open) {
2036                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
2037                 if (file_existed) {
2038                         existing_dos_attributes = dos_mode(conn, smb_fname);
2039                 }
2040         }
2041
2042         /* ignore any oplock requests if oplocks are disabled */
2043         if (!lp_oplocks(SNUM(conn)) ||
2044             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
2045                 /* Mask off everything except the private Samba bits. */
2046                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2047         }
2048
2049         /* this is for OS/2 long file names - say we don't support them */
2050         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2051                 /* OS/2 Workplace shell fix may be main code stream in a later
2052                  * release. */
2053                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2054                          "supported.\n"));
2055                 if (use_nt_status()) {
2056                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2057                 }
2058                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2059         }
2060
2061         switch( create_disposition ) {
2062                 case FILE_OPEN:
2063                         /* If file exists open. If file doesn't exist error. */
2064                         if (!file_existed) {
2065                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2066                                          "requested for file %s and file "
2067                                          "doesn't exist.\n",
2068                                          smb_fname_str_dbg(smb_fname)));
2069                                 errno = ENOENT;
2070                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2071                         }
2072                         break;
2073
2074                 case FILE_OVERWRITE:
2075                         /* If file exists overwrite. If file doesn't exist
2076                          * error. */
2077                         if (!file_existed) {
2078                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2079                                          "requested for file %s and file "
2080                                          "doesn't exist.\n",
2081                                          smb_fname_str_dbg(smb_fname) ));
2082                                 errno = ENOENT;
2083                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2084                         }
2085                         break;
2086
2087                 case FILE_CREATE:
2088                         /* If file exists error. If file doesn't exist
2089                          * create. */
2090                         if (file_existed) {
2091                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2092                                          "requested for file %s and file "
2093                                          "already exists.\n",
2094                                          smb_fname_str_dbg(smb_fname)));
2095                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2096                                         errno = EISDIR;
2097                                 } else {
2098                                         errno = EEXIST;
2099                                 }
2100                                 return map_nt_error_from_unix(errno);
2101                         }
2102                         break;
2103
2104                 case FILE_SUPERSEDE:
2105                 case FILE_OVERWRITE_IF:
2106                 case FILE_OPEN_IF:
2107                         break;
2108                 default:
2109                         return NT_STATUS_INVALID_PARAMETER;
2110         }
2111
2112         flags2 = disposition_to_open_flags(create_disposition);
2113
2114         /* We only care about matching attributes on file exists and
2115          * overwrite. */
2116
2117         if (!posix_open && file_existed &&
2118             ((create_disposition == FILE_OVERWRITE) ||
2119              (create_disposition == FILE_OVERWRITE_IF))) {
2120                 if (!open_match_attributes(conn, existing_dos_attributes,
2121                                            new_dos_attributes,
2122                                            smb_fname->st.st_ex_mode,
2123                                            unx_mode, &new_unx_mode)) {
2124                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2125                                  "for file %s (%x %x) (0%o, 0%o)\n",
2126                                  smb_fname_str_dbg(smb_fname),
2127                                  existing_dos_attributes,
2128                                  new_dos_attributes,
2129                                  (unsigned int)smb_fname->st.st_ex_mode,
2130                                  (unsigned int)unx_mode ));
2131                         errno = EACCES;
2132                         return NT_STATUS_ACCESS_DENIED;
2133                 }
2134         }
2135
2136         status = smbd_calculate_access_mask(conn, smb_fname,
2137                                         false,
2138                                         access_mask,
2139                                         &access_mask);
2140         if (!NT_STATUS_IS_OK(status)) {
2141                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2142                         "on file %s returned %s\n",
2143                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2144                 return status;
2145         }
2146
2147         open_access_mask = access_mask;
2148
2149         if ((flags2 & O_TRUNC) || (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE)) {
2150                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2151         }
2152
2153         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2154                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2155                     access_mask));
2156
2157         /*
2158          * Note that we ignore the append flag as append does not
2159          * mean the same thing under DOS and Unix.
2160          */
2161
2162         flags = calculate_open_access_flags(access_mask, oplock_request,
2163                                             private_flags);
2164
2165         /*
2166          * Currently we only look at FILE_WRITE_THROUGH for create options.
2167          */
2168
2169 #if defined(O_SYNC)
2170         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2171                 flags2 |= O_SYNC;
2172         }
2173 #endif /* O_SYNC */
2174
2175         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2176                 flags2 |= O_APPEND;
2177         }
2178
2179         if (!posix_open && !CAN_WRITE(conn)) {
2180                 /*
2181                  * We should really return a permission denied error if either
2182                  * O_CREAT or O_TRUNC are set, but for compatibility with
2183                  * older versions of Samba we just AND them out.
2184                  */
2185                 flags2 &= ~(O_CREAT|O_TRUNC);
2186         }
2187
2188         /*
2189          * Ensure we can't write on a read-only share or file.
2190          */
2191
2192         if (flags != O_RDONLY && file_existed &&
2193             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2194                 DEBUG(5,("open_file_ntcreate: write access requested for "
2195                          "file %s on read only %s\n",
2196                          smb_fname_str_dbg(smb_fname),
2197                          !CAN_WRITE(conn) ? "share" : "file" ));
2198                 errno = EACCES;
2199                 return NT_STATUS_ACCESS_DENIED;
2200         }
2201
2202         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2203         fsp->share_access = share_access;
2204         fsp->fh->private_options = private_flags;
2205         fsp->access_mask = open_access_mask; /* We change this to the
2206                                               * requested access_mask after
2207                                               * the open is done. */
2208         fsp->posix_open = posix_open;
2209
2210         /* Ensure no SAMBA_PRIVATE bits can be set. */
2211         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2212
2213         if (timeval_is_zero(&request_time)) {
2214                 request_time = fsp->open_time;
2215         }
2216
2217         if (file_existed) {
2218                 struct share_mode_entry *batch_entry = NULL;
2219                 struct share_mode_entry *exclusive_entry = NULL;
2220                 bool got_level2_oplock = false;
2221                 bool got_a_none_oplock = false;
2222                 struct file_id id;
2223
2224                 struct timespec old_write_time = smb_fname->st.st_ex_mtime;
2225                 id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2226
2227                 lck = get_share_mode_lock(talloc_tos(), id,
2228                                           conn->connectpath,
2229                                           smb_fname, &old_write_time);
2230                 if (lck == NULL) {
2231                         DEBUG(0, ("Could not get share mode lock\n"));
2232                         return NT_STATUS_SHARING_VIOLATION;
2233                 }
2234
2235                 /* Get the types we need to examine. */
2236                 find_oplock_types(fsp,
2237                                 oplock_request,
2238                                 lck,
2239                                 &batch_entry,
2240                                 &exclusive_entry,
2241                                 &got_level2_oplock,
2242                                 &got_a_none_oplock);
2243
2244                 /* First pass - send break only on batch oplocks. */
2245                 if ((req != NULL) &&
2246                                 delay_for_batch_oplocks(fsp,
2247                                         req->mid,
2248                                         oplock_request,
2249                                         batch_entry)) {
2250                         schedule_defer_open(lck, request_time, req);
2251                         TALLOC_FREE(lck);
2252                         return NT_STATUS_SHARING_VIOLATION;
2253                 }
2254
2255                 /* Use the client requested access mask here, not the one we
2256                  * open with. */
2257                 status = open_mode_check(conn, lck, fsp->name_hash,
2258                                         access_mask, share_access,
2259                                          create_options, &file_existed);
2260
2261                 if (NT_STATUS_IS_OK(status)) {
2262                         /* We might be going to allow this open. Check oplock
2263                          * status again. */
2264                         /* Second pass - send break for both batch or
2265                          * exclusive oplocks. */
2266                         if ((req != NULL) &&
2267                                         delay_for_exclusive_oplocks(
2268                                                 fsp,
2269                                                 req->mid,
2270                                                 oplock_request,
2271                                                 exclusive_entry)) {
2272                                 schedule_defer_open(lck, request_time, req);
2273                                 TALLOC_FREE(lck);
2274                                 return NT_STATUS_SHARING_VIOLATION;
2275                         }
2276                 }
2277
2278                 if (NT_STATUS_EQUAL(status, NT_STATUS_DELETE_PENDING)) {
2279                         /* DELETE_PENDING is not deferred for a second */
2280                         TALLOC_FREE(lck);
2281                         return status;
2282                 }
2283
2284                 grant_fsp_oplock_type(fsp,
2285                                 oplock_request,
2286                                 got_level2_oplock,
2287                                 got_a_none_oplock);
2288
2289                 if (!NT_STATUS_IS_OK(status)) {
2290                         uint32 can_access_mask;
2291                         bool can_access = True;
2292
2293                         SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2294
2295                         /* Check if this can be done with the deny_dos and fcb
2296                          * calls. */
2297                         if (private_flags &
2298                             (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2299                              NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2300                                 if (req == NULL) {
2301                                         DEBUG(0, ("DOS open without an SMB "
2302                                                   "request!\n"));
2303                                         TALLOC_FREE(lck);
2304                                         return NT_STATUS_INTERNAL_ERROR;
2305                                 }
2306
2307                                 /* Use the client requested access mask here,
2308                                  * not the one we open with. */
2309                                 status = fcb_or_dos_open(req,
2310                                                         conn,
2311                                                         fsp,
2312                                                         smb_fname,
2313                                                         id,
2314                                                         req->smbpid,
2315                                                         req->vuid,
2316                                                         access_mask,
2317                                                         share_access,
2318                                                         create_options);
2319
2320                                 if (NT_STATUS_IS_OK(status)) {
2321                                         TALLOC_FREE(lck);
2322                                         if (pinfo) {
2323                                                 *pinfo = FILE_WAS_OPENED;
2324                                         }
2325                                         return NT_STATUS_OK;
2326                                 }
2327                         }
2328
2329                         /*
2330                          * This next line is a subtlety we need for
2331                          * MS-Access. If a file open will fail due to share
2332                          * permissions and also for security (access) reasons,
2333                          * we need to return the access failed error, not the
2334                          * share error. We can't open the file due to kernel
2335                          * oplock deadlock (it's possible we failed above on
2336                          * the open_mode_check()) so use a userspace check.
2337                          */
2338
2339                         if (flags & O_RDWR) {
2340                                 can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2341                         } else if (flags & O_WRONLY) {
2342                                 can_access_mask = FILE_WRITE_DATA;
2343                         } else {
2344                                 can_access_mask = FILE_READ_DATA;
2345                         }
2346
2347                         if (((can_access_mask & FILE_WRITE_DATA) &&
2348                                 !CAN_WRITE(conn)) ||
2349                                 !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2350                                                         smb_fname,
2351                                                         false,
2352                                                         can_access_mask))) {
2353                                 can_access = False;
2354                         }
2355
2356                         /*
2357                          * If we're returning a share violation, ensure we
2358                          * cope with the braindead 1 second delay.
2359                          */
2360
2361                         if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2362                             lp_defer_sharing_violations()) {
2363                                 struct timeval timeout;
2364                                 struct deferred_open_record state;
2365                                 int timeout_usecs;
2366
2367                                 /* this is a hack to speed up torture tests
2368                                    in 'make test' */
2369                                 timeout_usecs = lp_parm_int(SNUM(conn),
2370                                                             "smbd","sharedelay",
2371                                                             SHARING_VIOLATION_USEC_WAIT);
2372
2373                                 /* This is a relative time, added to the absolute
2374                                    request_time value to get the absolute timeout time.
2375                                    Note that if this is the second or greater time we enter
2376                                    this codepath for this particular request mid then
2377                                    request_time is left as the absolute time of the *first*
2378                                    time this request mid was processed. This is what allows
2379                                    the request to eventually time out. */
2380
2381                                 timeout = timeval_set(0, timeout_usecs);
2382
2383                                 /* Nothing actually uses state.delayed_for_oplocks
2384                                    but it's handy to differentiate in debug messages
2385                                    between a 30 second delay due to oplock break, and
2386                                    a 1 second delay for share mode conflicts. */
2387
2388                                 state.delayed_for_oplocks = False;
2389                                 state.async_open = false;
2390                                 state.id = id;
2391
2392                                 if ((req != NULL)
2393                                     && !request_timed_out(request_time,
2394                                                           timeout)) {
2395                                         defer_open(lck, request_time, timeout,
2396                                                    req, &state);
2397                                 }
2398                         }
2399
2400                         TALLOC_FREE(lck);
2401                         if (can_access) {
2402                                 /*
2403                                  * We have detected a sharing violation here
2404                                  * so return the correct error code
2405                                  */
2406                                 status = NT_STATUS_SHARING_VIOLATION;
2407                         } else {
2408                                 status = NT_STATUS_ACCESS_DENIED;
2409                         }
2410                         return status;
2411                 }
2412
2413                 /*
2414                  * We exit this block with the share entry *locked*.....
2415                  */
2416         }
2417
2418         SMB_ASSERT(!file_existed || (lck != NULL));
2419
2420         /*
2421          * Ensure we pay attention to default ACLs on directories if required.
2422          */
2423
2424         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2425             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2426                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2427         }
2428
2429         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2430                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2431                  (unsigned int)flags, (unsigned int)flags2,
2432                  (unsigned int)unx_mode, (unsigned int)access_mask,
2433                  (unsigned int)open_access_mask));
2434
2435         fsp_open = open_file(fsp, conn, req, parent_dir,
2436                              flags|flags2, unx_mode, access_mask,
2437                              open_access_mask, &new_file_created);
2438
2439         if (!NT_STATUS_IS_OK(fsp_open)) {
2440                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2441                         schedule_async_open(request_time, req);
2442                 }
2443                 TALLOC_FREE(lck);
2444                 return fsp_open;
2445         }
2446
2447         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2448                 /*
2449                  * The file did exist, but some other (local or NFS)
2450                  * process either renamed/unlinked and re-created the
2451                  * file with different dev/ino after we walked the path,
2452                  * but before we did the open. We could retry the
2453                  * open but it's a rare enough case it's easier to
2454                  * just fail the open to prevent creating any problems
2455                  * in the open file db having the wrong dev/ino key.
2456                  */
2457                 TALLOC_FREE(lck);
2458                 fd_close(fsp);
2459                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2460                         "Old (dev=0x%llu, ino =0x%llu). "
2461                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2462                         " with NT_STATUS_ACCESS_DENIED.\n",
2463                          smb_fname_str_dbg(smb_fname),
2464                          (unsigned long long)saved_stat.st_ex_dev,
2465                          (unsigned long long)saved_stat.st_ex_ino,
2466                          (unsigned long long)smb_fname->st.st_ex_dev,
2467                          (unsigned long long)smb_fname->st.st_ex_ino));
2468                 return NT_STATUS_ACCESS_DENIED;
2469         }
2470
2471         if (!file_existed) {
2472                 struct share_mode_entry *batch_entry = NULL;
2473                 struct share_mode_entry *exclusive_entry = NULL;
2474                 bool got_level2_oplock = false;
2475                 bool got_a_none_oplock = false;
2476                 struct timespec old_write_time = smb_fname->st.st_ex_mtime;
2477                 struct file_id id;
2478                 /*
2479                  * Deal with the race condition where two smbd's detect the
2480                  * file doesn't exist and do the create at the same time. One
2481                  * of them will win and set a share mode, the other (ie. this
2482                  * one) should check if the requested share mode for this
2483                  * create is allowed.
2484                  */
2485
2486                 /*
2487                  * Now the file exists and fsp is successfully opened,
2488                  * fsp->dev and fsp->inode are valid and should replace the
2489                  * dev=0,inode=0 from a non existent file. Spotted by
2490                  * Nadav Danieli <nadavd@exanet.com>. JRA.
2491                  */
2492
2493                 id = fsp->file_id;
2494
2495                 lck = get_share_mode_lock(talloc_tos(), id,
2496                                           conn->connectpath,
2497                                           smb_fname, &old_write_time);
2498
2499                 if (lck == NULL) {
2500                         DEBUG(0, ("open_file_ntcreate: Could not get share "
2501                                   "mode lock for %s\n",
2502                                   smb_fname_str_dbg(smb_fname)));
2503                         fd_close(fsp);
2504                         return NT_STATUS_SHARING_VIOLATION;
2505                 }
2506
2507                 /* Get the types we need to examine. */
2508                 find_oplock_types(fsp,
2509                                 oplock_request,
2510                                 lck,
2511                                 &batch_entry,
2512                                 &exclusive_entry,
2513                                 &got_level2_oplock,
2514                                 &got_a_none_oplock);
2515
2516                 /* First pass - send break only on batch oplocks. */
2517                 if ((req != NULL) &&
2518                                 delay_for_batch_oplocks(fsp,
2519                                         req->mid,
2520                                         oplock_request,
2521                                         batch_entry)) {
2522                         schedule_defer_open(lck, request_time, req);
2523                         TALLOC_FREE(lck);
2524                         fd_close(fsp);
2525                         return NT_STATUS_SHARING_VIOLATION;
2526                 }
2527
2528                 status = open_mode_check(conn, lck, fsp->name_hash,
2529                                         access_mask, share_access,
2530                                          create_options, &file_existed);
2531
2532                 if (NT_STATUS_IS_OK(status)) {
2533                         /* We might be going to allow this open. Check oplock
2534                          * status again. */
2535                         /* Second pass - send break for both batch or
2536                          * exclusive oplocks. */
2537                         if ((req != NULL) &&
2538                                         delay_for_exclusive_oplocks(
2539                                                 fsp,
2540                                                 req->mid,
2541                                                 oplock_request,
2542                                                 exclusive_entry)) {
2543                                 schedule_defer_open(lck, request_time, req);
2544                                 TALLOC_FREE(lck);
2545                                 fd_close(fsp);
2546                                 return NT_STATUS_SHARING_VIOLATION;
2547                         }
2548                 }
2549
2550                 if (NT_STATUS_EQUAL(status, NT_STATUS_DELETE_PENDING)) {
2551                         /* DELETE_PENDING is not deferred for a second */
2552                         TALLOC_FREE(lck);
2553                         return status;
2554                 }
2555
2556                 if (!NT_STATUS_IS_OK(status)) {
2557                         uint32 can_access_mask;
2558                         bool can_access = True;
2559
2560                         SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2561
2562                         /* Check if this can be done with the deny_dos and fcb
2563                          * calls. */
2564                         if (private_flags &
2565                             (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2566                              NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2567                                 if (req == NULL) {
2568                                         DEBUG(0, ("DOS open without an SMB "
2569                                                   "request!\n"));
2570                                         TALLOC_FREE(lck);
2571                                         return NT_STATUS_INTERNAL_ERROR;
2572                                 }
2573
2574                                 /* Use the client requested access mask here,
2575                                  * not the one we open with. */
2576                                 status = fcb_or_dos_open(req,
2577                                                         conn,
2578                                                         fsp,
2579                                                         smb_fname,
2580                                                         id,
2581                                                         req->smbpid,
2582                                                         req->vuid,
2583                                                         access_mask,
2584                                                         share_access,
2585                                                         create_options);
2586
2587                                 if (NT_STATUS_IS_OK(status)) {
2588                                         TALLOC_FREE(lck);
2589                                         if (pinfo) {
2590                                                 *pinfo = FILE_WAS_OPENED;
2591                                         }
2592                                         return NT_STATUS_OK;
2593                                 }
2594                         }
2595
2596                         /*
2597                          * This next line is a subtlety we need for
2598                          * MS-Access. If a file open will fail due to share
2599                          * permissions and also for security (access) reasons,
2600                          * we need to return the access failed error, not the
2601                          * share error. We can't open the file due to kernel
2602                          * oplock deadlock (it's possible we failed above on
2603                          * the open_mode_check()) so use a userspace check.
2604                          */
2605
2606                         if (flags & O_RDWR) {
2607                                 can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2608                         } else if (flags & O_WRONLY) {
2609                                 can_access_mask = FILE_WRITE_DATA;
2610                         } else {
2611                                 can_access_mask = FILE_READ_DATA;
2612                         }
2613
2614                         if (((can_access_mask & FILE_WRITE_DATA) &&
2615                                 !CAN_WRITE(conn)) ||
2616                                 !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2617                                                         smb_fname,
2618                                                         false,
2619                                                         can_access_mask))) {
2620                                 can_access = False;
2621                         }
2622
2623                         /*
2624                          * If we're returning a share violation, ensure we
2625                          * cope with the braindead 1 second delay.
2626                          */
2627
2628                         if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2629                             lp_defer_sharing_violations()) {
2630                                 struct timeval timeout;
2631                                 struct deferred_open_record state;
2632                                 int timeout_usecs;
2633
2634                                 /* this is a hack to speed up torture tests
2635                                    in 'make test' */
2636                                 timeout_usecs = lp_parm_int(SNUM(conn),
2637                                                             "smbd","sharedelay",
2638                                                             SHARING_VIOLATION_USEC_WAIT);
2639
2640                                 /* This is a relative time, added to the absolute
2641                                    request_time value to get the absolute timeout time.
2642                                    Note that if this is the second or greater time we enter
2643                                    this codepath for this particular request mid then
2644                                    request_time is left as the absolute time of the *first*
2645                                    time this request mid was processed. This is what allows
2646                                    the request to eventually time out. */
2647
2648                                 timeout = timeval_set(0, timeout_usecs);
2649
2650                                 /* Nothing actually uses state.delayed_for_oplocks
2651                                    but it's handy to differentiate in debug messages
2652                                    between a 30 second delay due to oplock break, and
2653                                    a 1 second delay for share mode conflicts. */
2654
2655                                 state.delayed_for_oplocks = False;
2656                                 state.async_open = false;
2657                                 state.id = id;
2658
2659                                 if ((req != NULL)
2660                                     && !request_timed_out(request_time,
2661                                                           timeout)) {
2662                                         defer_open(lck, request_time, timeout,
2663                                                    req, &state);
2664                                 }
2665                         }
2666
2667                         TALLOC_FREE(lck);
2668                         if (can_access) {
2669                                 /*
2670                                  * We have detected a sharing violation here
2671                                  * so return the correct error code
2672                                  */
2673                                 status = NT_STATUS_SHARING_VIOLATION;
2674                         } else {
2675                                 status = NT_STATUS_ACCESS_DENIED;
2676                         }
2677                         return status;
2678                 }
2679
2680                 grant_fsp_oplock_type(fsp,
2681                                 oplock_request,
2682                                 got_level2_oplock,
2683                                 got_a_none_oplock);
2684
2685                 /*
2686                  * We exit this block with the share entry *locked*.....
2687                  */
2688
2689         }
2690
2691         SMB_ASSERT(lck != NULL);
2692
2693         /* Delete streams if create_disposition requires it */
2694         if (!new_file_created && clear_ads(create_disposition) &&
2695             !is_ntfs_stream_smb_fname(smb_fname)) {
2696                 status = delete_all_streams(conn, smb_fname->base_name);
2697                 if (!NT_STATUS_IS_OK(status)) {
2698                         TALLOC_FREE(lck);
2699                         fd_close(fsp);
2700                         return status;
2701                 }
2702         }
2703
2704         /* note that we ignore failure for the following. It is
2705            basically a hack for NFS, and NFS will never set one of
2706            these only read them. Nobody but Samba can ever set a deny
2707            mode and we have already checked our more authoritative
2708            locking database for permission to set this deny mode. If
2709            the kernel refuses the operations then the kernel is wrong.
2710            note that GPFS supports it as well - jmcd */
2711
2712         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
2713                 int ret_flock;
2714                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
2715                 if(ret_flock == -1 ){
2716
2717                         TALLOC_FREE(lck);
2718                         fd_close(fsp);
2719
2720                         return NT_STATUS_SHARING_VIOLATION;
2721                 }
2722         }
2723
2724         /*
2725          * At this point onwards, we can guarantee that the share entry
2726          * is locked, whether we created the file or not, and that the
2727          * deny mode is compatible with all current opens.
2728          */
2729
2730         /*
2731          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
2732          * but we don't have to store this - just ignore it on access check.
2733          */
2734         if (conn->sconn->using_smb2) {
2735                 /*
2736                  * SMB2 doesn't return it (according to Microsoft tests).
2737                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
2738                  * File created with access = 0x7 (Read, Write, Delete)
2739                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
2740                  */
2741                 fsp->access_mask = access_mask;
2742         } else {
2743                 /* But SMB1 does. */
2744                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
2745         }
2746
2747         if (file_existed) {
2748                 /* stat opens on existing files don't get oplocks. */
2749                 if (is_stat_open(open_access_mask)) {
2750                         fsp->oplock_type = NO_OPLOCK;
2751                 }
2752         }
2753
2754         if (new_file_created) {
2755                 info = FILE_WAS_CREATED;
2756         } else {
2757                 if (flags2 & O_TRUNC) {
2758                         info = FILE_WAS_OVERWRITTEN;
2759                 } else {
2760                         info = FILE_WAS_OPENED;
2761                 }
2762         }
2763
2764         if (pinfo) {
2765                 *pinfo = info;
2766         }
2767
2768         /*
2769          * Setup the oplock info in both the shared memory and
2770          * file structs.
2771          */
2772
2773         status = set_file_oplock(fsp, fsp->oplock_type);
2774         if (!NT_STATUS_IS_OK(status)) {
2775                 /*
2776                  * Could not get the kernel oplock or there are byte-range
2777                  * locks on the file.
2778                  */
2779                 fsp->oplock_type = NO_OPLOCK;
2780         }
2781
2782         set_share_mode(lck, fsp, get_current_uid(conn),
2783                         req ? req->mid : 0,
2784                        fsp->oplock_type);
2785
2786         /* Handle strange delete on close create semantics. */
2787         if (create_options & FILE_DELETE_ON_CLOSE) {
2788
2789                 status = can_set_delete_on_close(fsp, new_dos_attributes);
2790
2791                 if (!NT_STATUS_IS_OK(status)) {
2792                         /* Remember to delete the mode we just added. */
2793                         del_share_mode(lck, fsp);
2794                         TALLOC_FREE(lck);
2795                         fd_close(fsp);
2796                         return status;
2797                 }
2798                 /* Note that here we set the *inital* delete on close flag,
2799                    not the regular one. The magic gets handled in close. */
2800                 fsp->initial_delete_on_close = True;
2801         }
2802
2803         if (info != FILE_WAS_OPENED) {
2804                 /* Files should be initially set as archive */
2805                 if (lp_map_archive(SNUM(conn)) ||
2806                     lp_store_dos_attributes(SNUM(conn))) {
2807                         if (!posix_open) {
2808                                 if (file_set_dosmode(conn, smb_fname,
2809                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2810                                             parent_dir, true) == 0) {
2811                                         unx_mode = smb_fname->st.st_ex_mode;
2812                                 }
2813                         }
2814                 }
2815         }
2816
2817         /* Determine sparse flag. */
2818         if (posix_open) {
2819                 /* POSIX opens are sparse by default. */
2820                 fsp->is_sparse = true;
2821         } else {
2822                 fsp->is_sparse = (file_existed &&
2823                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
2824         }
2825
2826         /*
2827          * Take care of inherited ACLs on created files - if default ACL not
2828          * selected.
2829          */
2830
2831         if (!posix_open && new_file_created && !def_acl) {
2832
2833                 int saved_errno = errno; /* We might get ENOSYS in the next
2834                                           * call.. */
2835
2836                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
2837                     errno == ENOSYS) {
2838                         errno = saved_errno; /* Ignore ENOSYS */
2839                 }
2840
2841         } else if (new_unx_mode) {
2842
2843                 int ret = -1;
2844
2845                 /* Attributes need changing. File already existed. */
2846
2847                 {
2848                         int saved_errno = errno; /* We might get ENOSYS in the
2849                                                   * next call.. */
2850                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
2851
2852                         if (ret == -1 && errno == ENOSYS) {
2853                                 errno = saved_errno; /* Ignore ENOSYS */
2854                         } else {
2855                                 DEBUG(5, ("open_file_ntcreate: reset "
2856                                           "attributes of file %s to 0%o\n",
2857                                           smb_fname_str_dbg(smb_fname),
2858                                           (unsigned int)new_unx_mode));
2859                                 ret = 0; /* Don't do the fchmod below. */
2860                         }
2861                 }
2862
2863                 if ((ret == -1) &&
2864                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
2865                         DEBUG(5, ("open_file_ntcreate: failed to reset "
2866                                   "attributes of file %s to 0%o\n",
2867                                   smb_fname_str_dbg(smb_fname),
2868                                   (unsigned int)new_unx_mode));
2869         }
2870
2871         /* If this is a successful open, we must remove any deferred open
2872          * records. */
2873         if (req != NULL) {
2874                 del_deferred_open_entry(lck, req->mid,
2875                                         messaging_server_id(req->sconn->msg_ctx));
2876         }
2877         TALLOC_FREE(lck);
2878
2879         return NT_STATUS_OK;
2880 }
2881
2882
2883 /****************************************************************************
2884  Open a file for for write to ensure that we can fchmod it.
2885 ****************************************************************************/
2886
2887 NTSTATUS open_file_fchmod(connection_struct *conn,
2888                           struct smb_filename *smb_fname,
2889                           files_struct **result)
2890 {
2891         if (!VALID_STAT(smb_fname->st)) {
2892                 return NT_STATUS_INVALID_PARAMETER;
2893         }
2894
2895         return SMB_VFS_CREATE_FILE(
2896                 conn,                                   /* conn */
2897                 NULL,                                   /* req */
2898                 0,                                      /* root_dir_fid */
2899                 smb_fname,                              /* fname */
2900                 FILE_WRITE_DATA,                        /* access_mask */
2901                 (FILE_SHARE_READ | FILE_SHARE_WRITE |   /* share_access */
2902                     FILE_SHARE_DELETE),
2903                 FILE_OPEN,                              /* create_disposition*/
2904                 0,                                      /* create_options */
2905                 0,                                      /* file_attributes */
2906                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
2907                 0,                                      /* allocation_size */
2908                 0,                                      /* private_flags */
2909                 NULL,                                   /* sd */
2910                 NULL,                                   /* ea_list */
2911                 result,                                 /* result */
2912                 NULL);                                  /* pinfo */
2913 }
2914
2915 static NTSTATUS mkdir_internal(connection_struct *conn,
2916                                struct smb_filename *smb_dname,
2917                                uint32 file_attributes)
2918 {
2919         mode_t mode;
2920         char *parent_dir = NULL;
2921         NTSTATUS status;
2922         bool posix_open = false;
2923         bool need_re_stat = false;
2924         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
2925
2926         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
2927                 DEBUG(5,("mkdir_internal: failing share access "
2928                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
2929                 return NT_STATUS_ACCESS_DENIED;
2930         }
2931
2932         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
2933                             NULL)) {
2934                 return NT_STATUS_NO_MEMORY;
2935         }
2936
2937         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2938                 posix_open = true;
2939                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2940         } else {
2941                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
2942         }
2943
2944         status = check_parent_access(conn,
2945                                         smb_dname,
2946                                         access_mask);
2947         if(!NT_STATUS_IS_OK(status)) {
2948                 DEBUG(5,("mkdir_internal: check_parent_access "
2949                         "on directory %s for path %s returned %s\n",
2950                         parent_dir,
2951                         smb_dname->base_name,
2952                         nt_errstr(status) ));
2953                 return status;
2954         }
2955
2956         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
2957                 return map_nt_error_from_unix(errno);
2958         }
2959
2960         /* Ensure we're checking for a symlink here.... */
2961         /* We don't want to get caught by a symlink racer. */
2962
2963         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2964                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2965                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2966                 return map_nt_error_from_unix(errno);
2967         }
2968
2969         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
2970                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
2971                           smb_fname_str_dbg(smb_dname)));
2972                 return NT_STATUS_NOT_A_DIRECTORY;
2973         }
2974
2975         if (lp_store_dos_attributes(SNUM(conn))) {
2976                 if (!posix_open) {
2977                         file_set_dosmode(conn, smb_dname,
2978                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
2979                                          parent_dir, true);
2980                 }
2981         }
2982
2983         if (lp_inherit_perms(SNUM(conn))) {
2984                 inherit_access_posix_acl(conn, parent_dir,
2985                                          smb_dname->base_name, mode);
2986                 need_re_stat = true;
2987         }
2988
2989         if (!posix_open) {
2990                 /*
2991                  * Check if high bits should have been set,
2992                  * then (if bits are missing): add them.
2993                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
2994                  * dir.
2995                  */
2996                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
2997                     (mode & ~smb_dname->st.st_ex_mode)) {
2998                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
2999                                       (smb_dname->st.st_ex_mode |
3000                                           (mode & ~smb_dname->st.st_ex_mode)));
3001                         need_re_stat = true;
3002                 }
3003         }
3004
3005         /* Change the owner if required. */
3006         if (lp_inherit_owner(SNUM(conn))) {
3007                 change_dir_owner_to_parent(conn, parent_dir,
3008                                            smb_dname->base_name,
3009                                            &smb_dname->st);
3010                 need_re_stat = true;
3011         }
3012
3013         if (need_re_stat) {
3014                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
3015                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
3016                           smb_fname_str_dbg(smb_dname), strerror(errno)));
3017                         return map_nt_error_from_unix(errno);
3018                 }
3019         }
3020
3021         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
3022                      smb_dname->base_name);
3023
3024         return NT_STATUS_OK;
3025 }
3026
3027 /****************************************************************************
3028  Open a directory from an NT SMB call.
3029 ****************************************************************************/
3030
3031 static NTSTATUS open_directory(connection_struct *conn,
3032                                struct smb_request *req,
3033                                struct smb_filename *smb_dname,
3034                                uint32 access_mask,
3035                                uint32 share_access,
3036                                uint32 create_disposition,
3037                                uint32 create_options,
3038                                uint32 file_attributes,
3039                                int *pinfo,
3040                                files_struct **result)
3041 {
3042         files_struct *fsp = NULL;
3043         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
3044         struct share_mode_lock *lck = NULL;
3045         NTSTATUS status;
3046         struct timespec mtimespec;
3047         int info = 0;
3048
3049         if (is_ntfs_stream_smb_fname(smb_dname)) {
3050                 DEBUG(2, ("open_directory: %s is a stream name!\n",
3051                           smb_fname_str_dbg(smb_dname)));
3052                 return NT_STATUS_NOT_A_DIRECTORY;
3053         }
3054
3055         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
3056                 /* Ensure we have a directory attribute. */
3057                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
3058         }
3059
3060         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
3061                  "share_access = 0x%x create_options = 0x%x, "
3062                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
3063                  smb_fname_str_dbg(smb_dname),
3064                  (unsigned int)access_mask,
3065                  (unsigned int)share_access,
3066                  (unsigned int)create_options,
3067                  (unsigned int)create_disposition,
3068                  (unsigned int)file_attributes));
3069
3070         status = smbd_calculate_access_mask(conn, smb_dname, false,
3071                                             access_mask, &access_mask);
3072         if (!NT_STATUS_IS_OK(status)) {
3073                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
3074                         "on file %s returned %s\n",
3075                         smb_fname_str_dbg(smb_dname),
3076                         nt_errstr(status)));
3077                 return status;
3078         }
3079
3080         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3081                         !security_token_has_privilege(get_current_nttok(conn),
3082                                         SEC_PRIV_SECURITY)) {
3083                 DEBUG(10, ("open_directory: open on %s "
3084                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3085                         smb_fname_str_dbg(smb_dname)));
3086                 return NT_STATUS_PRIVILEGE_NOT_HELD;
3087         }
3088
3089         switch( create_disposition ) {
3090                 case FILE_OPEN:
3091
3092                         if (!dir_existed) {
3093                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
3094                         }
3095
3096                         info = FILE_WAS_OPENED;
3097                         break;
3098
3099                 case FILE_CREATE:
3100
3101                         /* If directory exists error. If directory doesn't
3102                          * exist create. */
3103
3104                         if (dir_existed) {
3105                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
3106                                 DEBUG(2, ("open_directory: unable to create "
3107                                           "%s. Error was %s\n",
3108                                           smb_fname_str_dbg(smb_dname),
3109                                           nt_errstr(status)));
3110                                 return status;
3111                         }
3112
3113                         status = mkdir_internal(conn, smb_dname,
3114                                                 file_attributes);
3115
3116                         if (!NT_STATUS_IS_OK(status)) {
3117                                 DEBUG(2, ("open_directory: unable to create "
3118                                           "%s. Error was %s\n",
3119                                           smb_fname_str_dbg(smb_dname),
3120                                           nt_errstr(status)));
3121                                 return status;
3122                         }
3123
3124                         info = FILE_WAS_CREATED;
3125                         break;
3126
3127                 case FILE_OPEN_IF:
3128                         /*
3129                          * If directory exists open. If directory doesn't
3130                          * exist create.
3131                          */
3132
3133                         if (dir_existed) {
3134                                 status = NT_STATUS_OK;
3135                                 info = FILE_WAS_OPENED;
3136                         } else {
3137                                 status = mkdir_internal(conn, smb_dname,
3138                                                 file_attributes);
3139
3140                                 if (NT_STATUS_IS_OK(status)) {
3141                                         info = FILE_WAS_CREATED;
3142                                 } else {
3143                                         /* Cope with create race. */
3144                                         if (!NT_STATUS_EQUAL(status,
3145                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
3146                                                 DEBUG(2, ("open_directory: unable to create "
3147                                                         "%s. Error was %s\n",
3148                                                         smb_fname_str_dbg(smb_dname),
3149                                                         nt_errstr(status)));
3150                                                 return status;
3151                                         }
3152                                         info = FILE_WAS_OPENED;
3153                                 }
3154                         }
3155
3156                         break;
3157
3158                 case FILE_SUPERSEDE:
3159                 case FILE_OVERWRITE:
3160                 case FILE_OVERWRITE_IF:
3161                 default:
3162                         DEBUG(5,("open_directory: invalid create_disposition "
3163                                  "0x%x for directory %s\n",
3164                                  (unsigned int)create_disposition,
3165                                  smb_fname_str_dbg(smb_dname)));
3166                         return NT_STATUS_INVALID_PARAMETER;
3167         }
3168
3169         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
3170                 DEBUG(5,("open_directory: %s is not a directory !\n",
3171                          smb_fname_str_dbg(smb_dname)));
3172                 return NT_STATUS_NOT_A_DIRECTORY;
3173         }
3174
3175         if (info == FILE_WAS_OPENED) {
3176                 status = smbd_check_access_rights(conn,
3177                                                 smb_dname,
3178                                                 false,
3179                                                 access_mask);
3180                 if (!NT_STATUS_IS_OK(status)) {
3181                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
3182                                 "file %s failed with %s\n",
3183                                 smb_fname_str_dbg(smb_dname),
3184                                 nt_errstr(status)));
3185                         return status;
3186                 }
3187         }
3188
3189         status = file_new(req, conn, &fsp);
3190         if(!NT_STATUS_IS_OK(status)) {
3191                 return status;
3192         }
3193
3194         /*
3195          * Setup the files_struct for it.
3196          */
3197
3198         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
3199         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
3200         fsp->file_pid = req ? req->smbpid : 0;
3201         fsp->can_lock = False;
3202         fsp->can_read = False;
3203         fsp->can_write = False;
3204
3205         fsp->share_access = share_access;
3206         fsp->fh->private_options = 0;
3207         /*
3208          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3209          */
3210         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3211         fsp->print_file = NULL;
3212         fsp->modified = False;
3213         fsp->oplock_type = NO_OPLOCK;
3214         fsp->sent_oplock_break = NO_BREAK_SENT;
3215         fsp->is_directory = True;
3216         fsp->posix_open = (file_attributes & FILE_FLAG_POSIX_SEMANTICS) ? True : False;
3217         status = fsp_set_smb_fname(fsp, smb_dname);
3218         if (!NT_STATUS_IS_OK(status)) {
3219                 file_free(req, fsp);
3220                 return status;
3221         }
3222
3223         mtimespec = smb_dname->st.st_ex_mtime;
3224
3225 #ifdef O_DIRECTORY
3226         status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
3227 #else
3228         /* POSIX allows us to open a directory with O_RDONLY. */
3229         status = fd_open(conn, fsp, O_RDONLY, 0);
3230 #endif
3231         if (!NT_STATUS_IS_OK(status)) {
3232                 DEBUG(5, ("open_directory: Could not open fd for "
3233                         "%s (%s)\n",
3234                         smb_fname_str_dbg(smb_dname),
3235                         nt_errstr(status)));
3236                 file_free(req, fsp);
3237                 return status;
3238         }
3239
3240         status = vfs_stat_fsp(fsp);
3241         if (!NT_STATUS_IS_OK(status)) {
3242                 fd_close(fsp);
3243                 file_free(req, fsp);
3244                 return status;
3245         }
3246
3247         /* Ensure there was no race condition. */
3248         if (!check_same_stat(&smb_dname->st, &fsp->fsp_name->st)) {
3249                 DEBUG(5,("open_directory: stat struct differs for "
3250                         "directory %s.\n",
3251                         smb_fname_str_dbg(smb_dname)));
3252                 fd_close(fsp);
3253                 file_free(req, fsp);
3254                 return NT_STATUS_ACCESS_DENIED;
3255         }
3256
3257         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
3258                                   conn->connectpath, smb_dname,
3259                                   &mtimespec);
3260
3261         if (lck == NULL) {
3262                 DEBUG(0, ("open_directory: Could not get share mode lock for "
3263                           "%s\n", smb_fname_str_dbg(smb_dname)));
3264                 fd_close(fsp);
3265                 file_free(req, fsp);
3266                 return NT_STATUS_SHARING_VIOLATION;
3267         }
3268
3269         status = open_mode_check(conn, lck, fsp->name_hash,
3270                                 access_mask, share_access,
3271                                  create_options, &dir_existed);
3272
3273         if (!NT_STATUS_IS_OK(status)) {
3274                 TALLOC_FREE(lck);
3275                 fd_close(fsp);
3276                 file_free(req, fsp);
3277                 return status;
3278         }
3279
3280         set_share_mode(lck, fsp, get_current_uid(conn),
3281                         req ? req->mid : 0, NO_OPLOCK);
3282
3283         /* For directories the delete on close bit at open time seems
3284            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
3285         if (create_options & FILE_DELETE_ON_CLOSE) {
3286                 status = can_set_delete_on_close(fsp, 0);
3287                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
3288                         TALLOC_FREE(lck);
3289                         fd_close(fsp);
3290                         file_free(req, fsp);
3291                         return status;
3292                 }
3293
3294                 if (NT_STATUS_IS_OK(status)) {
3295                         /* Note that here we set the *inital* delete on close flag,
3296                            not the regular one. The magic gets handled in close. */
3297                         fsp->initial_delete_on_close = True;
3298                 }
3299         }
3300
3301         TALLOC_FREE(lck);
3302
3303         if (pinfo) {
3304                 *pinfo = info;
3305         }
3306
3307         *result = fsp;
3308         return NT_STATUS_OK;
3309 }
3310
3311 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
3312                           struct smb_filename *smb_dname)
3313 {
3314         NTSTATUS status;
3315         files_struct *fsp;
3316
3317         status = SMB_VFS_CREATE_FILE(
3318                 conn,                                   /* conn */
3319                 req,                                    /* req */
3320                 0,                                      /* root_dir_fid */
3321                 smb_dname,                              /* fname */
3322                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3323                 FILE_SHARE_NONE,                        /* share_access */
3324                 FILE_CREATE,                            /* create_disposition*/
3325                 FILE_DIRECTORY_FILE,                    /* create_options */
3326                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
3327                 0,                                      /* oplock_request */
3328                 0,                                      /* allocation_size */
3329                 0,                                      /* private_flags */
3330                 NULL,                                   /* sd */
3331                 NULL,                                   /* ea_list */
3332                 &fsp,                                   /* result */
3333                 NULL);                                  /* pinfo */
3334
3335         if (NT_STATUS_IS_OK(status)) {
3336                 close_file(req, fsp, NORMAL_CLOSE);
3337         }
3338
3339         return status;
3340 }
3341
3342 /****************************************************************************
3343  Receive notification that one of our open files has been renamed by another
3344  smbd process.
3345 ****************************************************************************/
3346
3347 void msg_file_was_renamed(struct messaging_context *msg,
3348                           void *private_data,
3349                           uint32_t msg_type,
3350                           struct server_id server_id,
3351                           DATA_BLOB *data)
3352 {
3353         files_struct *fsp;
3354         char *frm = (char *)data->data;
3355         struct file_id id;
3356         const char *sharepath;
3357         const char *base_name;
3358         const char *stream_name;
3359         struct smb_filename *smb_fname = NULL;
3360         size_t sp_len, bn_len;
3361         NTSTATUS status;
3362         struct smbd_server_connection *sconn =
3363                 talloc_get_type_abort(private_data,
3364                 struct smbd_server_connection);
3365
3366         if (data->data == NULL
3367             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
3368                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
3369                           (int)data->length));
3370                 return;
3371         }
3372
3373         /* Unpack the message. */
3374         pull_file_id_24(frm, &id);
3375         sharepath = &frm[24];
3376         sp_len = strlen(sharepath);
3377         base_name = sharepath + sp_len + 1;
3378         bn_len = strlen(base_name);
3379         stream_name = sharepath + sp_len + 1 + bn_len + 1;
3380
3381         /* stream_name must always be NULL if there is no stream. */
3382         if (stream_name[0] == '\0') {
3383                 stream_name = NULL;
3384         }
3385
3386         status = create_synthetic_smb_fname(talloc_tos(), base_name,
3387                                             stream_name, NULL, &smb_fname);
3388         if (!NT_STATUS_IS_OK(status)) {
3389                 return;
3390         }
3391
3392         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
3393                 "file_id %s\n",
3394                 sharepath, smb_fname_str_dbg(smb_fname),
3395                 file_id_string_tos(&id)));
3396
3397         for(fsp = file_find_di_first(sconn, id); fsp;
3398             fsp = file_find_di_next(fsp)) {
3399                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
3400
3401                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
3402                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
3403                                 smb_fname_str_dbg(smb_fname)));
3404                         status = fsp_set_smb_fname(fsp, smb_fname);
3405                         if (!NT_STATUS_IS_OK(status)) {
3406                                 goto out;
3407                         }
3408                 } else {
3409                         /* TODO. JRA. */
3410                         /* Now we have the complete path we can work out if this is
3411                            actually within this share and adjust newname accordingly. */
3412                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
3413                                 "not sharepath %s) "
3414                                 "%s from %s -> %s\n",
3415                                 fsp->conn->connectpath,
3416                                 sharepath,
3417                                 fsp_fnum_dbg(fsp),
3418                                 fsp_str_dbg(fsp),
3419                                 smb_fname_str_dbg(smb_fname)));
3420                 }
3421         }
3422  out:
3423         TALLOC_FREE(smb_fname);
3424         return;
3425 }
3426
3427 /*
3428  * If a main file is opened for delete, all streams need to be checked for
3429  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
3430  * If that works, delete them all by setting the delete on close and close.
3431  */
3432
3433 NTSTATUS open_streams_for_delete(connection_struct *conn,
3434                                         const char *fname)
3435 {
3436         struct stream_struct *stream_info = NULL;
3437         files_struct **streams = NULL;
3438         int i;
3439         unsigned int num_streams = 0;
3440         TALLOC_CTX *frame = talloc_stackframe();
3441         NTSTATUS status;
3442
3443         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
3444                                 &num_streams, &stream_info);
3445
3446         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
3447             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
3448                 DEBUG(10, ("no streams around\n"));
3449                 TALLOC_FREE(frame);
3450                 return NT_STATUS_OK;
3451         }
3452
3453         if (!NT_STATUS_IS_OK(status)) {
3454                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
3455                            nt_errstr(status)));
3456                 goto fail;
3457         }
3458
3459         DEBUG(10, ("open_streams_for_delete found %d streams\n",
3460                    num_streams));
3461
3462         if (num_streams == 0) {
3463                 TALLOC_FREE(frame);
3464                 return NT_STATUS_OK;
3465         }
3466
3467         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
3468         if (streams == NULL) {
3469                 DEBUG(0, ("talloc failed\n"));
3470                 status = NT_STATUS_NO_MEMORY;
3471                 goto fail;
3472         }
3473
3474         for (i=0; i<num_streams; i++) {
3475                 struct smb_filename *smb_fname = NULL;
3476
3477                 if (strequal(stream_info[i].name, "::$DATA")) {
3478                         streams[i] = NULL;
3479                         continue;
3480                 }
3481
3482                 status = create_synthetic_smb_fname(talloc_tos(), fname,
3483                                                     stream_info[i].name,
3484                                                     NULL, &smb_fname);
3485                 if (!NT_STATUS_IS_OK(status)) {
3486                         goto fail;
3487                 }
3488
3489                 if (SMB_VFS_STAT(conn, smb_fname) == -1) {
3490                         DEBUG(10, ("Unable to stat stream: %s\n",
3491                                    smb_fname_str_dbg(smb_fname)));
3492                 }
3493
3494                 status = SMB_VFS_CREATE_FILE(
3495                          conn,                  /* conn */
3496                          NULL,                  /* req */
3497                          0,                     /* root_dir_fid */
3498                          smb_fname,             /* fname */
3499                          DELETE_ACCESS,         /* access_mask */
3500                          (FILE_SHARE_READ |     /* share_access */
3501                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
3502                          FILE_OPEN,             /* create_disposition*/
3503                          0,                     /* create_options */
3504                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
3505                          0,                     /* oplock_request */
3506                          0,                     /* allocation_size */
3507                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
3508                          NULL,                  /* sd */
3509                          NULL,                  /* ea_list */
3510                          &streams[i],           /* result */
3511                          NULL);                 /* pinfo */
3512
3513                 if (!NT_STATUS_IS_OK(status)) {
3514                         DEBUG(10, ("Could not open stream %s: %s\n",
3515                                    smb_fname_str_dbg(smb_fname),
3516                                    nt_errstr(status)));
3517
3518                         TALLOC_FREE(smb_fname);
3519                         break;
3520                 }
3521                 TALLOC_FREE(smb_fname);
3522         }
3523
3524         /*
3525          * don't touch the variable "status" beyond this point :-)
3526          */
3527
3528         for (i -= 1 ; i >= 0; i--) {
3529                 if (streams[i] == NULL) {
3530                         continue;
3531                 }
3532
3533                 DEBUG(10, ("Closing stream # %d, %s\n", i,
3534                            fsp_str_dbg(streams[i])));
3535                 close_file(NULL, streams[i], NORMAL_CLOSE);
3536         }
3537
3538  fail:
3539         TALLOC_FREE(frame);
3540         return status;
3541 }
3542
3543 /*********************************************************************
3544  Create a default ACL by inheriting from the parent. If no inheritance
3545  from the parent available, don't set anything. This will leave the actual
3546  permissions the new file or directory already got from the filesystem
3547  as the NT ACL when read.
3548 *********************************************************************/
3549
3550 static NTSTATUS inherit_new_acl(files_struct *fsp)
3551 {
3552         TALLOC_CTX *ctx = talloc_tos();
3553         char *parent_name = NULL;
3554         struct security_descriptor *parent_desc = NULL;
3555         NTSTATUS status = NT_STATUS_OK;
3556         struct security_descriptor *psd = NULL;
3557         struct dom_sid *owner_sid = NULL;
3558         struct dom_sid *group_sid = NULL;
3559         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
3560         bool inherit_owner = lp_inherit_owner(SNUM(fsp->conn));
3561         bool inheritable_components = false;
3562         size_t size = 0;
3563
3564         if (!parent_dirname(ctx, fsp->fsp_name->base_name, &parent_name, NULL)) {
3565                 return NT_STATUS_NO_MEMORY;
3566         }
3567
3568         status = SMB_VFS_GET_NT_ACL(fsp->conn,
3569                                 parent_name,
3570                                 (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
3571                                 &parent_desc);
3572         if (!NT_STATUS_IS_OK(status)) {
3573                 return status;
3574         }
3575
3576         inheritable_components = sd_has_inheritable_components(parent_desc,
3577                                         fsp->is_directory);
3578
3579         if (!inheritable_components && !inherit_owner) {
3580                 /* Nothing to inherit and not setting owner. */
3581                 return NT_STATUS_OK;
3582         }
3583
3584         /* Create an inherited descriptor from the parent. */
3585
3586         if (DEBUGLEVEL >= 10) {
3587                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
3588                         fsp_str_dbg(fsp) ));
3589                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
3590         }
3591
3592         /* Inherit from parent descriptor if "inherit owner" set. */
3593         if (inherit_owner) {
3594                 owner_sid = parent_desc->owner_sid;
3595                 group_sid = parent_desc->group_sid;
3596         }
3597
3598         if (owner_sid == NULL) {
3599                 owner_sid = &fsp->conn->session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
3600         }
3601         if (group_sid == NULL) {
3602                 group_sid = &fsp->conn->session_info->security_token->sids[PRIMARY_GROUP_SID_INDEX];
3603         }
3604
3605         status = se_create_child_secdesc(ctx,
3606                         &psd,
3607                         &size,
3608                         parent_desc,
3609                         owner_sid,
3610                         group_sid,
3611                         fsp->is_directory);
3612         if (!NT_STATUS_IS_OK(status)) {
3613                 return status;
3614         }
3615
3616         /* If inheritable_components == false,
3617            se_create_child_secdesc()
3618            creates a security desriptor with a NULL dacl
3619            entry, but with SEC_DESC_DACL_PRESENT. We need
3620            to remove that flag. */
3621
3622         if (!inheritable_components) {
3623                 security_info_sent &= ~SECINFO_DACL;
3624                 psd->type &= ~SEC_DESC_DACL_PRESENT;
3625         }
3626
3627         if (DEBUGLEVEL >= 10) {
3628                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
3629                         fsp_str_dbg(fsp) ));
3630                 NDR_PRINT_DEBUG(security_descriptor, psd);
3631         }
3632
3633         if (inherit_owner) {
3634                 /* We need to be root to force this. */
3635                 become_root();
3636         }
3637         status = SMB_VFS_FSET_NT_ACL(fsp,
3638                         security_info_sent,
3639                         psd);
3640         if (inherit_owner) {
3641                 unbecome_root();
3642         }
3643         return status;
3644 }
3645
3646 /*
3647  * Wrapper around open_file_ntcreate and open_directory
3648  */
3649
3650 static NTSTATUS create_file_unixpath(connection_struct *conn,
3651                                      struct smb_request *req,
3652                                      struct smb_filename *smb_fname,
3653                                      uint32_t access_mask,
3654                                      uint32_t share_access,
3655                                      uint32_t create_disposition,
3656                                      uint32_t create_options,
3657                                      uint32_t file_attributes,
3658                                      uint32_t oplock_request,
3659                                      uint64_t allocation_size,
3660                                      uint32_t private_flags,
3661                                      struct security_descriptor *sd,
3662                                      struct ea_list *ea_list,
3663
3664                                      files_struct **result,
3665                                      int *pinfo)
3666 {
3667         int info = FILE_WAS_OPENED;
3668         files_struct *base_fsp = NULL;
3669         files_struct *fsp = NULL;
3670         NTSTATUS status;
3671
3672         DEBUG(10,("create_file_unixpath: access_mask = 0x%x "
3673                   "file_attributes = 0x%x, share_access = 0x%x, "
3674                   "create_disposition = 0x%x create_options = 0x%x "
3675                   "oplock_request = 0x%x private_flags = 0x%x "
3676                   "ea_list = 0x%p, sd = 0x%p, "
3677                   "fname = %s\n",
3678                   (unsigned int)access_mask,
3679                   (unsigned int)file_attributes,
3680                   (unsigned int)share_access,
3681                   (unsigned int)create_disposition,
3682                   (unsigned int)create_options,
3683                   (unsigned int)oplock_request,
3684                   (unsigned int)private_flags,
3685                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
3686
3687         if (create_options & FILE_OPEN_BY_FILE_ID) {
3688                 status = NT_STATUS_NOT_SUPPORTED;
3689                 goto fail;
3690         }
3691
3692         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
3693                 status = NT_STATUS_INVALID_PARAMETER;
3694                 goto fail;
3695         }
3696
3697         if (req == NULL) {
3698                 oplock_request |= INTERNAL_OPEN_ONLY;
3699         }
3700
3701         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3702             && (access_mask & DELETE_ACCESS)
3703             && !is_ntfs_stream_smb_fname(smb_fname)) {
3704                 /*
3705                  * We can't open a file with DELETE access if any of the
3706                  * streams is open without FILE_SHARE_DELETE
3707                  */
3708                 status = open_streams_for_delete(conn, smb_fname->base_name);
3709
3710                 if (!NT_STATUS_IS_OK(status)) {
3711                         goto fail;
3712                 }
3713         }
3714
3715         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3716                         !security_token_has_privilege(get_current_nttok(conn),
3717                                         SEC_PRIV_SECURITY)) {
3718                 DEBUG(10, ("create_file_unixpath: open on %s "
3719                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3720                         smb_fname_str_dbg(smb_fname)));
3721                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
3722                 goto fail;
3723         }
3724
3725         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3726             && is_ntfs_stream_smb_fname(smb_fname)
3727             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
3728                 uint32 base_create_disposition;
3729                 struct smb_filename *smb_fname_base = NULL;
3730
3731                 if (create_options & FILE_DIRECTORY_FILE) {
3732                         status = NT_STATUS_NOT_A_DIRECTORY;
3733                         goto fail;
3734                 }
3735
3736                 switch (create_disposition) {
3737                 case FILE_OPEN:
3738                         base_create_disposition = FILE_OPEN;
3739                         break;
3740                 default:
3741                         base_create_disposition = FILE_OPEN_IF;
3742                         break;
3743                 }
3744
3745                 /* Create an smb_filename with stream_name == NULL. */
3746                 status = create_synthetic_smb_fname(talloc_tos(),
3747                                                     smb_fname->base_name,
3748                                                     NULL, NULL,
3749                                                     &smb_fname_base);
3750                 if (!NT_STATUS_IS_OK(status)) {
3751                         goto fail;
3752                 }
3753
3754                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
3755                         DEBUG(10, ("Unable to stat stream: %s\n",
3756                                    smb_fname_str_dbg(smb_fname_base)));
3757                 }
3758
3759                 /* Open the base file. */
3760                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
3761                                               FILE_SHARE_READ
3762                                               | FILE_SHARE_WRITE
3763                                               | FILE_SHARE_DELETE,
3764                                               base_create_disposition,
3765                                               0, 0, 0, 0, 0, NULL, NULL,
3766                                               &base_fsp, NULL);
3767                 TALLOC_FREE(smb_fname_base);
3768
3769                 if (!NT_STATUS_IS_OK(status)) {
3770                         DEBUG(10, ("create_file_unixpath for base %s failed: "
3771                                    "%s\n", smb_fname->base_name,
3772                                    nt_errstr(status)));
3773                         goto fail;
3774                 }
3775                 /* we don't need to low level fd */
3776                 fd_close(base_fsp);
3777         }
3778
3779         /*
3780          * If it's a request for a directory open, deal with it separately.
3781          */
3782
3783         if (create_options & FILE_DIRECTORY_FILE) {
3784
3785                 if (create_options & FILE_NON_DIRECTORY_FILE) {
3786                         status = NT_STATUS_INVALID_PARAMETER;
3787                         goto fail;
3788                 }
3789
3790                 /* Can't open a temp directory. IFS kit test. */
3791                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
3792                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
3793                         status = NT_STATUS_INVALID_PARAMETER;
3794                         goto fail;
3795                 }
3796
3797                 /*
3798                  * We will get a create directory here if the Win32
3799                  * app specified a security descriptor in the
3800                  * CreateDirectory() call.
3801                  */
3802
3803                 oplock_request = 0;
3804                 status = open_directory(
3805                         conn, req, smb_fname, access_mask, share_access,
3806                         create_disposition, create_options, file_attributes,
3807                         &info, &fsp);
3808         } else {
3809
3810                 /*
3811                  * Ordinary file case.
3812                  */
3813
3814                 status = file_new(req, conn, &fsp);
3815                 if(!NT_STATUS_IS_OK(status)) {
3816                         goto fail;
3817                 }
3818
3819                 status = fsp_set_smb_fname(fsp, smb_fname);
3820                 if (!NT_STATUS_IS_OK(status)) {
3821                         goto fail;
3822                 }
3823
3824                 if (base_fsp) {
3825                         /*
3826                          * We're opening the stream element of a
3827                          * base_fsp we already opened. Set up the
3828                          * base_fsp pointer.
3829                          */
3830                         fsp->base_fsp = base_fsp;
3831                 }
3832
3833                 if (allocation_size) {
3834                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
3835                                                         allocation_size);
3836                 }
3837
3838                 status = open_file_ntcreate(conn,
3839                                             req,
3840                                             access_mask,
3841                                             share_access,
3842                                             create_disposition,
3843                                             create_options,
3844                                             file_attributes,
3845                                             oplock_request,
3846                                             private_flags,
3847                                             &info,
3848                                             fsp);
3849
3850                 if(!NT_STATUS_IS_OK(status)) {
3851                         file_free(req, fsp);
3852                         fsp = NULL;
3853                 }
3854
3855                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
3856
3857                         /* A stream open never opens a directory */
3858
3859                         if (base_fsp) {
3860                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3861                                 goto fail;
3862                         }
3863
3864                         /*
3865                          * Fail the open if it was explicitly a non-directory
3866                          * file.
3867                          */
3868
3869                         if (create_options & FILE_NON_DIRECTORY_FILE) {
3870                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3871                                 goto fail;
3872                         }
3873
3874                         oplock_request = 0;
3875                         status = open_directory(
3876                                 conn, req, smb_fname, access_mask,
3877                                 share_access, create_disposition,
3878                                 create_options, file_attributes,
3879                                 &info, &fsp);
3880                 }
3881         }
3882
3883         if (!NT_STATUS_IS_OK(status)) {
3884                 goto fail;
3885         }
3886
3887         fsp->base_fsp = base_fsp;
3888
3889         if ((ea_list != NULL) &&
3890             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
3891                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
3892                 if (!NT_STATUS_IS_OK(status)) {
3893                         goto fail;
3894                 }
3895         }
3896
3897         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
3898                 status = NT_STATUS_ACCESS_DENIED;
3899                 goto fail;
3900         }
3901
3902         /* Save the requested allocation size. */
3903         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
3904                 if (allocation_size
3905                     && (allocation_size > fsp->fsp_name->st.st_ex_size)) {
3906                         fsp->initial_allocation_size = smb_roundup(
3907                                 fsp->conn, allocation_size);
3908                         if (fsp->is_directory) {
3909                                 /* Can't set allocation size on a directory. */
3910                                 status = NT_STATUS_ACCESS_DENIED;
3911                                 goto fail;
3912                         }
3913                         if (vfs_allocate_file_space(
3914                                     fsp, fsp->initial_allocation_size) == -1) {
3915                                 status = NT_STATUS_DISK_FULL;
3916                                 goto fail;
3917                         }
3918                 } else {
3919                         fsp->initial_allocation_size = smb_roundup(
3920                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
3921                 }
3922         } else {
3923                 fsp->initial_allocation_size = 0;
3924         }
3925
3926         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
3927                                 fsp->base_fsp == NULL) {
3928                 if (sd != NULL) {
3929                         /*
3930                          * According to the MS documentation, the only time the security
3931                          * descriptor is applied to the opened file is iff we *created* the
3932                          * file; an existing file stays the same.
3933                          *
3934                          * Also, it seems (from observation) that you can open the file with
3935                          * any access mask but you can still write the sd. We need to override
3936                          * the granted access before we call set_sd
3937                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
3938                          */
3939
3940                         uint32_t sec_info_sent;
3941                         uint32_t saved_access_mask = fsp->access_mask;
3942
3943                         sec_info_sent = get_sec_info(sd);
3944
3945                         fsp->access_mask = FILE_GENERIC_ALL;
3946
3947                         if (sec_info_sent & (SECINFO_OWNER|
3948                                                 SECINFO_GROUP|
3949                                                 SECINFO_DACL|
3950                                                 SECINFO_SACL)) {
3951                                 status = set_sd(fsp, sd, sec_info_sent);
3952                         }
3953
3954                         fsp->access_mask = saved_access_mask;
3955
3956                         if (!NT_STATUS_IS_OK(status)) {
3957                                 goto fail;
3958                         }
3959                 } else if (lp_inherit_acls(SNUM(conn))) {
3960                         /* Inherit from parent. Errors here are not fatal. */
3961                         status = inherit_new_acl(fsp);
3962                         if (!NT_STATUS_IS_OK(status)) {
3963                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
3964                                         fsp_str_dbg(fsp),
3965                                         nt_errstr(status) ));
3966                         }
3967                 }
3968         }
3969
3970         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
3971
3972         *result = fsp;
3973         if (pinfo != NULL) {
3974                 *pinfo = info;
3975         }
3976
3977         smb_fname->st = fsp->fsp_name->st;
3978
3979         return NT_STATUS_OK;
3980
3981  fail:
3982         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
3983
3984         if (fsp != NULL) {
3985                 if (base_fsp && fsp->base_fsp == base_fsp) {
3986                         /*
3987                          * The close_file below will close
3988                          * fsp->base_fsp.
3989                          */
3990                         base_fsp = NULL;
3991                 }
3992                 close_file(req, fsp, ERROR_CLOSE);
3993                 fsp = NULL;
3994         }
3995         if (base_fsp != NULL) {
3996                 close_file(req, base_fsp, ERROR_CLOSE);
3997                 base_fsp = NULL;
3998         }
3999         return status;
4000 }
4001
4002 /*
4003  * Calculate the full path name given a relative fid.
4004  */
4005 NTSTATUS get_relative_fid_filename(connection_struct *conn,
4006                                    struct smb_request *req,
4007                                    uint16_t root_dir_fid,
4008                                    const struct smb_filename *smb_fname,
4009                                    struct smb_filename **smb_fname_out)
4010 {
4011         files_struct *dir_fsp;
4012         char *parent_fname = NULL;
4013         char *new_base_name = NULL;
4014         NTSTATUS status;
4015
4016         if (root_dir_fid == 0 || !smb_fname) {
4017                 status = NT_STATUS_INTERNAL_ERROR;
4018                 goto out;
4019         }
4020
4021         dir_fsp = file_fsp(req, root_dir_fid);
4022
4023         if (dir_fsp == NULL) {
4024                 status = NT_STATUS_INVALID_HANDLE;
4025                 goto out;
4026         }
4027
4028         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
4029                 status = NT_STATUS_INVALID_HANDLE;
4030                 goto out;
4031         }
4032
4033         if (!dir_fsp->is_directory) {
4034
4035                 /*
4036                  * Check to see if this is a mac fork of some kind.
4037                  */
4038
4039                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
4040                     is_ntfs_stream_smb_fname(smb_fname)) {
4041                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
4042                         goto out;
4043                 }
4044
4045                 /*
4046                   we need to handle the case when we get a
4047                   relative open relative to a file and the
4048                   pathname is blank - this is a reopen!
4049                   (hint from demyn plantenberg)
4050                 */
4051
4052                 status = NT_STATUS_INVALID_HANDLE;
4053                 goto out;
4054         }
4055
4056         if (ISDOT(dir_fsp->fsp_name->base_name)) {
4057                 /*
4058                  * We're at the toplevel dir, the final file name
4059                  * must not contain ./, as this is filtered out
4060                  * normally by srvstr_get_path and unix_convert
4061                  * explicitly rejects paths containing ./.
4062                  */
4063                 parent_fname = talloc_strdup(talloc_tos(), "");
4064                 if (parent_fname == NULL) {
4065                         status = NT_STATUS_NO_MEMORY;
4066                         goto out;
4067                 }
4068         } else {
4069                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
4070
4071                 /*
4072                  * Copy in the base directory name.
4073                  */
4074
4075                 parent_fname = talloc_array(talloc_tos(), char,
4076                     dir_name_len+2);
4077                 if (parent_fname == NULL) {
4078                         status = NT_STATUS_NO_MEMORY;
4079                         goto out;
4080                 }
4081                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
4082                     dir_name_len+1);
4083
4084                 /*
4085                  * Ensure it ends in a '/'.
4086                  * We used TALLOC_SIZE +2 to add space for the '/'.
4087                  */
4088
4089                 if(dir_name_len
4090                     && (parent_fname[dir_name_len-1] != '\\')
4091                     && (parent_fname[dir_name_len-1] != '/')) {
4092                         parent_fname[dir_name_len] = '/';
4093                         parent_fname[dir_name_len+1] = '\0';
4094                 }
4095         }
4096
4097         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
4098                                         smb_fname->base_name);
4099         if (new_base_name == NULL) {
4100                 status = NT_STATUS_NO_MEMORY;
4101                 goto out;
4102         }
4103
4104         status = filename_convert(req,
4105                                 conn,
4106                                 req->flags2 & FLAGS2_DFS_PATHNAMES,
4107                                 new_base_name,
4108                                 0,
4109                                 NULL,
4110                                 smb_fname_out);
4111         if (!NT_STATUS_IS_OK(status)) {
4112                 goto out;
4113         }
4114
4115  out:
4116         TALLOC_FREE(parent_fname);
4117         TALLOC_FREE(new_base_name);
4118         return status;
4119 }
4120
4121 NTSTATUS create_file_default(connection_struct *conn,
4122                              struct smb_request *req,
4123                              uint16_t root_dir_fid,
4124                              struct smb_filename *smb_fname,
4125                              uint32_t access_mask,
4126                              uint32_t share_access,
4127                              uint32_t create_disposition,
4128                              uint32_t create_options,
4129                              uint32_t file_attributes,
4130                              uint32_t oplock_request,
4131                              uint64_t allocation_size,
4132                              uint32_t private_flags,
4133                              struct security_descriptor *sd,
4134                              struct ea_list *ea_list,
4135                              files_struct **result,
4136                              int *pinfo)
4137 {
4138         int info = FILE_WAS_OPENED;
4139         files_struct *fsp = NULL;
4140         NTSTATUS status;
4141         bool stream_name = false;
4142
4143         DEBUG(10,("create_file: access_mask = 0x%x "
4144                   "file_attributes = 0x%x, share_access = 0x%x, "
4145                   "create_disposition = 0x%x create_options = 0x%x "
4146                   "oplock_request = 0x%x "
4147                   "private_flags = 0x%x "
4148                   "root_dir_fid = 0x%x, ea_list = 0x%p, sd = 0x%p, "
4149                   "fname = %s\n",
4150                   (unsigned int)access_mask,
4151                   (unsigned int)file_attributes,
4152                   (unsigned int)share_access,
4153                   (unsigned int)create_disposition,
4154                   (unsigned int)create_options,
4155                   (unsigned int)oplock_request,
4156                   (unsigned int)private_flags,
4157                   (unsigned int)root_dir_fid,
4158                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4159
4160         /*
4161          * Calculate the filename from the root_dir_if if necessary.
4162          */
4163
4164         if (root_dir_fid != 0) {
4165                 struct smb_filename *smb_fname_out = NULL;
4166                 status = get_relative_fid_filename(conn, req, root_dir_fid,
4167                                                    smb_fname, &smb_fname_out);
4168                 if (!NT_STATUS_IS_OK(status)) {
4169                         goto fail;
4170                 }
4171                 smb_fname = smb_fname_out;
4172         }
4173
4174         /*
4175          * Check to see if this is a mac fork of some kind.
4176          */
4177
4178         stream_name = is_ntfs_stream_smb_fname(smb_fname);
4179         if (stream_name) {
4180                 enum FAKE_FILE_TYPE fake_file_type;
4181
4182                 fake_file_type = is_fake_file(smb_fname);
4183
4184                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
4185
4186                         /*
4187                          * Here we go! support for changing the disk quotas
4188                          * --metze
4189                          *
4190                          * We need to fake up to open this MAGIC QUOTA file
4191                          * and return a valid FID.
4192                          *
4193                          * w2k close this file directly after openening xp
4194                          * also tries a QUERY_FILE_INFO on the file and then
4195                          * close it
4196                          */
4197                         status = open_fake_file(req, conn, req->vuid,
4198                                                 fake_file_type, smb_fname,
4199                                                 access_mask, &fsp);
4200                         if (!NT_STATUS_IS_OK(status)) {
4201                                 goto fail;
4202                         }
4203
4204                         ZERO_STRUCT(smb_fname->st);
4205                         goto done;
4206                 }
4207
4208                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
4209                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
4210                         goto fail;
4211                 }
4212         }
4213
4214         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
4215                 int ret;
4216                 smb_fname->stream_name = NULL;
4217                 /* We have to handle this error here. */
4218                 if (create_options & FILE_DIRECTORY_FILE) {
4219                         status = NT_STATUS_NOT_A_DIRECTORY;
4220                         goto fail;
4221                 }
4222                 if (lp_posix_pathnames()) {
4223                         ret = SMB_VFS_LSTAT(conn, smb_fname);
4224                 } else {
4225                         ret = SMB_VFS_STAT(conn, smb_fname);
4226                 }
4227
4228                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
4229                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
4230                         goto fail;
4231                 }
4232         }
4233
4234         status = create_file_unixpath(
4235                 conn, req, smb_fname, access_mask, share_access,
4236                 create_disposition, create_options, file_attributes,
4237                 oplock_request, allocation_size, private_flags,
4238                 sd, ea_list,
4239                 &fsp, &info);
4240
4241         if (!NT_STATUS_IS_OK(status)) {
4242                 goto fail;
4243         }
4244
4245  done:
4246         DEBUG(10, ("create_file: info=%d\n", info));
4247
4248         *result = fsp;
4249         if (pinfo != NULL) {
4250                 *pinfo = info;
4251         }
4252         return NT_STATUS_OK;
4253
4254  fail:
4255         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
4256
4257         if (fsp != NULL) {
4258                 close_file(req, fsp, ERROR_CLOSE);
4259                 fsp = NULL;
4260         }
4261         return status;
4262 }