source3/smbd/open.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    file opening and share modes
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2004
   6    Copyright (C) Volker Lendecke 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/filesys.h"
  24 #include "printing.h"
  25 #include "smbd/smbd.h"
  26 #include "smbd/globals.h"
  27 #include "fake_file.h"
  28 #include "../libcli/security/security.h"
  29 #include "../librpc/gen_ndr/ndr_security.h"
  30 #include "../librpc/gen_ndr/open_files.h"
  31 #include "../librpc/gen_ndr/idmap.h"
  32 #include "passdb/lookup_sid.h"
  33 #include "auth.h"
  34 #include "serverid.h"
  35 #include "messages.h"
  36
  37 extern const struct generic_mapping file_generic_mapping;
  38
  39 struct deferred_open_record {
  40         bool delayed_for_oplocks;
  41         bool async_open;
  42         struct file_id id;
  43 };
  44
  45 /****************************************************************************
  46  If the requester wanted DELETE_ACCESS and was rejected because
  47  the file ACL didn't include DELETE_ACCESS, see if the parent ACL
  48  overrides this.
  49 ****************************************************************************/
  50
  51 static bool parent_override_delete(connection_struct *conn,
  52                                         const struct smb_filename *smb_fname,
  53                                         uint32_t access_mask,
  54                                         uint32_t rejected_mask)
  55 {
  56         if ((access_mask & DELETE_ACCESS) &&
  57                     (rejected_mask & DELETE_ACCESS) &&
  58                     can_delete_file_in_directory(conn, smb_fname)) {
  59                 return true;
  60         }
  61         return false;
  62 }
  63
  64 /****************************************************************************
  65  Check if we have open rights.
  66 ****************************************************************************/
  67
  68 NTSTATUS smbd_check_access_rights(struct connection_struct *conn,
  69                                 const struct smb_filename *smb_fname,
  70                                 bool use_privs,
  71                                 uint32_t access_mask)
  72 {
  73         /* Check if we have rights to open. */
  74         NTSTATUS status;
  75         struct security_descriptor *sd = NULL;
  76         uint32_t rejected_share_access;
  77         uint32_t rejected_mask = access_mask;
  78
  79         rejected_share_access = access_mask & ~(conn->share_access);
  80
  81         if (rejected_share_access) {
  82                 DEBUG(10, ("smbd_check_access_rights: rejected share access 0x%x "
  83                         "on %s (0x%x)\n",
  84                         (unsigned int)access_mask,
  85                         smb_fname_str_dbg(smb_fname),
  86                         (unsigned int)rejected_share_access ));
  87                 return NT_STATUS_ACCESS_DENIED;
  88         }
  89
  90         if (!use_privs && get_current_uid(conn) == (uid_t)0) {
  91                 /* I'm sorry sir, I didn't know you were root... */
  92                 DEBUG(10,("smbd_check_access_rights: root override "
  93                         "on %s. Granting 0x%x\n",
  94                         smb_fname_str_dbg(smb_fname),
  95                         (unsigned int)access_mask ));
  96                 return NT_STATUS_OK;
  97         }
  98
  99         if ((access_mask & DELETE_ACCESS) && !lp_acl_check_permissions(SNUM(conn))) {
 100                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 101                         "on DELETE_ACCESS on file %s. Granting 0x%x\n",
 102                         smb_fname_str_dbg(smb_fname),
 103                         (unsigned int)access_mask ));
 104                 return NT_STATUS_OK;
 105         }
 106
 107         if (access_mask == DELETE_ACCESS &&
 108                         VALID_STAT(smb_fname->st) &&
 109                         S_ISLNK(smb_fname->st.st_ex_mode)) {
 110                 /* We can always delete a symlink. */
 111                 DEBUG(10,("smbd_check_access_rights: not checking ACL "
 112                         "on DELETE_ACCESS on symlink %s.\n",
 113                         smb_fname_str_dbg(smb_fname) ));
 114                 return NT_STATUS_OK;
 115         }
 116
 117         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
 118                         (SECINFO_OWNER |
 119                         SECINFO_GROUP |
 120                          SECINFO_DACL), talloc_tos(), &sd);
 121
 122         if (!NT_STATUS_IS_OK(status)) {
 123                 DEBUG(10, ("smbd_check_access_rights: Could not get acl "
 124                         "on %s: %s\n",
 125                         smb_fname_str_dbg(smb_fname),
 126                         nt_errstr(status)));
 127
 128                 if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 129                         goto access_denied;
 130                 }
 131
 132                 return status;
 133         }
 134
 135         /*
 136          * If we can access the path to this file, by
 137          * default we have FILE_READ_ATTRIBUTES from the
 138          * containing directory. See the section:
 139          * "Algorithm to Check Access to an Existing File"
 140          * in MS-FSA.pdf.
 141          *
 142          * se_file_access_check() also takes care of
 143          * owner WRITE_DAC and READ_CONTROL.
 144          */
 145         status = se_file_access_check(sd,
 146                                 get_current_nttok(conn),
 147                                 use_privs,
 148                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 149                                 &rejected_mask);
 150
 151         DEBUG(10,("smbd_check_access_rights: file %s requesting "
 152                 "0x%x returning 0x%x (%s)\n",
 153                 smb_fname_str_dbg(smb_fname),
 154                 (unsigned int)access_mask,
 155                 (unsigned int)rejected_mask,
 156                 nt_errstr(status) ));
 157
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 if (DEBUGLEVEL >= 10) {
 160                         DEBUG(10,("smbd_check_access_rights: acl for %s is:\n",
 161                                 smb_fname_str_dbg(smb_fname) ));
 162                         NDR_PRINT_DEBUG(security_descriptor, sd);
 163                 }
 164         }
 165
 166         TALLOC_FREE(sd);
 167
 168         if (NT_STATUS_IS_OK(status) ||
 169                         !NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 170                 return status;
 171         }
 172
 173         /* Here we know status == NT_STATUS_ACCESS_DENIED. */
 174
 175   access_denied:
 176
 177         if ((access_mask & FILE_WRITE_ATTRIBUTES) &&
 178                         (rejected_mask & FILE_WRITE_ATTRIBUTES) &&
 179                         !lp_store_dos_attributes(SNUM(conn)) &&
 180                         (lp_map_readonly(SNUM(conn)) ||
 181                         lp_map_archive(SNUM(conn)) ||
 182                         lp_map_hidden(SNUM(conn)) ||
 183                         lp_map_system(SNUM(conn)))) {
 184                 rejected_mask &= ~FILE_WRITE_ATTRIBUTES;
 185
 186                 DEBUG(10,("smbd_check_access_rights: "
 187                         "overrode "
 188                         "FILE_WRITE_ATTRIBUTES "
 189                         "on file %s\n",
 190                         smb_fname_str_dbg(smb_fname)));
 191         }
 192
 193         if (parent_override_delete(conn,
 194                                 smb_fname,
 195                                 access_mask,
 196                                 rejected_mask)) {
 197                 /* Were we trying to do an open
 198                  * for delete and didn't get DELETE
 199                  * access (only) ? Check if the
 200                  * directory allows DELETE_CHILD.
 201                  * See here:
 202                  * http://blogs.msdn.com/oldnewthing/archive/2004/06/04/148426.aspx
 203                  * for details. */
 204
 205                 rejected_mask &= ~DELETE_ACCESS;
 206
 207                 DEBUG(10,("smbd_check_access_rights: "
 208                         "overrode "
 209                         "DELETE_ACCESS on "
 210                         "file %s\n",
 211                         smb_fname_str_dbg(smb_fname)));
 212         }
 213
 214         if (rejected_mask != 0) {
 215                 return NT_STATUS_ACCESS_DENIED;
 216         }
 217         return NT_STATUS_OK;
 218 }
 219
 220 static NTSTATUS check_parent_access(struct connection_struct *conn,
 221                                 struct smb_filename *smb_fname,
 222                                 uint32_t access_mask)
 223 {
 224         NTSTATUS status;
 225         char *parent_dir = NULL;
 226         struct security_descriptor *parent_sd = NULL;
 227         uint32_t access_granted = 0;
 228
 229         if (!parent_dirname(talloc_tos(),
 230                                 smb_fname->base_name,
 231                                 &parent_dir,
 232                                 NULL)) {
 233                 return NT_STATUS_NO_MEMORY;
 234         }
 235
 236         if (get_current_uid(conn) == (uid_t)0) {
 237                 /* I'm sorry sir, I didn't know you were root... */
 238                 DEBUG(10,("check_parent_access: root override "
 239                         "on %s. Granting 0x%x\n",
 240                         smb_fname_str_dbg(smb_fname),
 241                         (unsigned int)access_mask ));
 242                 return NT_STATUS_OK;
 243         }
 244
 245         status = SMB_VFS_GET_NT_ACL(conn,
 246                                 parent_dir,
 247                                 SECINFO_DACL,
 248                                     talloc_tos(),
 249                                 &parent_sd);
 250
 251         if (!NT_STATUS_IS_OK(status)) {
 252                 DEBUG(5,("check_parent_access: SMB_VFS_GET_NT_ACL failed for "
 253                         "%s with error %s\n",
 254                         parent_dir,
 255                         nt_errstr(status)));
 256                 return status;
 257         }
 258
 259         /*
 260          * If we can access the path to this file, by
 261          * default we have FILE_READ_ATTRIBUTES from the
 262          * containing directory. See the section:
 263          * "Algorithm to Check Access to an Existing File"
 264          * in MS-FSA.pdf.
 265          *
 266          * se_file_access_check() also takes care of
 267          * owner WRITE_DAC and READ_CONTROL.
 268          */
 269         status = se_file_access_check(parent_sd,
 270                                 get_current_nttok(conn),
 271                                 false,
 272                                 (access_mask & ~FILE_READ_ATTRIBUTES),
 273                                 &access_granted);
 274         if(!NT_STATUS_IS_OK(status)) {
 275                 DEBUG(5,("check_parent_access: access check "
 276                         "on directory %s for "
 277                         "path %s for mask 0x%x returned (0x%x) %s\n",
 278                         parent_dir,
 279                         smb_fname->base_name,
 280                         access_mask,
 281                         access_granted,
 282                         nt_errstr(status) ));
 283                 return status;
 284         }
 285
 286         return NT_STATUS_OK;
 287 }
 288
 289 /****************************************************************************
 290  fd support routines - attempt to do a dos_open.
 291 ****************************************************************************/
 292
 293 NTSTATUS fd_open(struct connection_struct *conn,
 294                  files_struct *fsp,
 295                  int flags,
 296                  mode_t mode)
 297 {
 298         struct smb_filename *smb_fname = fsp->fsp_name;
 299         NTSTATUS status = NT_STATUS_OK;
 300
 301 #ifdef O_NOFOLLOW
 302         /*
 303          * Never follow symlinks on a POSIX client. The
 304          * client should be doing this.
 305          */
 306
 307         if (fsp->posix_open || !lp_symlinks(SNUM(conn))) {
 308                 flags |= O_NOFOLLOW;
 309         }
 310 #endif
 311
 312         fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, mode);
 313         if (fsp->fh->fd == -1) {
 314                 int posix_errno = errno;
 315 #ifdef O_NOFOLLOW
 316 #if defined(ENOTSUP) && defined(OSF1)
 317                 /* handle special Tru64 errno */
 318                 if (errno == ENOTSUP) {
 319                         posix_errno = ELOOP;
 320                 }
 321 #endif /* ENOTSUP */
 322 #ifdef EFTYPE
 323                 /* fix broken NetBSD errno */
 324                 if (errno == EFTYPE) {
 325                         posix_errno = ELOOP;
 326                 }
 327 #endif /* EFTYPE */
 328                 /* fix broken FreeBSD errno */
 329                 if (errno == EMLINK) {
 330                         posix_errno = ELOOP;
 331                 }
 332 #endif /* O_NOFOLLOW */
 333                 status = map_nt_error_from_unix(posix_errno);
 334                 if (errno == EMFILE) {
 335                         static time_t last_warned = 0L;
 336
 337                         if (time((time_t *) NULL) > last_warned) {
 338                                 DEBUG(0,("Too many open files, unable "
 339                                         "to open more!  smbd's max "
 340                                         "open files = %d\n",
 341                                         lp_max_open_files()));
 342                                 last_warned = time((time_t *) NULL);
 343                         }
 344                 }
 345
 346         }
 347
 348         DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n",
 349                   smb_fname_str_dbg(smb_fname), flags, (int)mode, fsp->fh->fd,
 350                 (fsp->fh->fd == -1) ? strerror(errno) : "" ));
 351
 352         return status;
 353 }
 354
 355 /****************************************************************************
 356  Close the file associated with a fsp.
 357 ****************************************************************************/
 358
 359 NTSTATUS fd_close(files_struct *fsp)
 360 {
 361         int ret;
 362
 363         if (fsp->dptr) {
 364                 dptr_CloseDir(fsp);
 365         }
 366         if (fsp->fh->fd == -1) {
 367                 return NT_STATUS_OK; /* What we used to call a stat open. */
 368         }
 369         if (fsp->fh->ref_count > 1) {
 370                 return NT_STATUS_OK; /* Shared handle. Only close last reference. */
 371         }
 372
 373         ret = SMB_VFS_CLOSE(fsp);
 374         fsp->fh->fd = -1;
 375         if (ret == -1) {
 376                 return map_nt_error_from_unix(errno);
 377         }
 378         return NT_STATUS_OK;
 379 }
 380
 381 /****************************************************************************
 382  Change the ownership of a file to that of the parent directory.
 383  Do this by fd if possible.
 384 ****************************************************************************/
 385
 386 void change_file_owner_to_parent(connection_struct *conn,
 387                                         const char *inherit_from_dir,
 388                                         files_struct *fsp)
 389 {
 390         struct smb_filename *smb_fname_parent;
 391         int ret;
 392
 393         smb_fname_parent = synthetic_smb_fname(talloc_tos(), inherit_from_dir,
 394                                                NULL, NULL);
 395         if (smb_fname_parent == NULL) {
 396                 return;
 397         }
 398
 399         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 400         if (ret == -1) {
 401                 DEBUG(0,("change_file_owner_to_parent: failed to stat parent "
 402                          "directory %s. Error was %s\n",
 403                          smb_fname_str_dbg(smb_fname_parent),
 404                          strerror(errno)));
 405                 TALLOC_FREE(smb_fname_parent);
 406                 return;
 407         }
 408
 409         if (smb_fname_parent->st.st_ex_uid == fsp->fsp_name->st.st_ex_uid) {
 410                 /* Already this uid - no need to change. */
 411                 DEBUG(10,("change_file_owner_to_parent: file %s "
 412                         "is already owned by uid %d\n",
 413                         fsp_str_dbg(fsp),
 414                         (int)fsp->fsp_name->st.st_ex_uid ));
 415                 TALLOC_FREE(smb_fname_parent);
 416                 return;
 417         }
 418
 419         become_root();
 420         ret = SMB_VFS_FCHOWN(fsp, smb_fname_parent->st.st_ex_uid, (gid_t)-1);
 421         unbecome_root();
 422         if (ret == -1) {
 423                 DEBUG(0,("change_file_owner_to_parent: failed to fchown "
 424                          "file %s to parent directory uid %u. Error "
 425                          "was %s\n", fsp_str_dbg(fsp),
 426                          (unsigned int)smb_fname_parent->st.st_ex_uid,
 427                          strerror(errno) ));
 428         } else {
 429                 DEBUG(10,("change_file_owner_to_parent: changed new file %s to "
 430                         "parent directory uid %u.\n", fsp_str_dbg(fsp),
 431                         (unsigned int)smb_fname_parent->st.st_ex_uid));
 432                 /* Ensure the uid entry is updated. */
 433                 fsp->fsp_name->st.st_ex_uid = smb_fname_parent->st.st_ex_uid;
 434         }
 435
 436         TALLOC_FREE(smb_fname_parent);
 437 }
 438
 439 NTSTATUS change_dir_owner_to_parent(connection_struct *conn,
 440                                        const char *inherit_from_dir,
 441                                        const char *fname,
 442                                        SMB_STRUCT_STAT *psbuf)
 443 {
 444         struct smb_filename *smb_fname_parent;
 445         struct smb_filename *smb_fname_cwd = NULL;
 446         char *saved_dir = NULL;
 447         TALLOC_CTX *ctx = talloc_tos();
 448         NTSTATUS status = NT_STATUS_OK;
 449         int ret;
 450
 451         smb_fname_parent = synthetic_smb_fname(ctx, inherit_from_dir,
 452                                                NULL, NULL);
 453         if (smb_fname_parent == NULL) {
 454                 return NT_STATUS_NO_MEMORY;
 455         }
 456
 457         ret = SMB_VFS_STAT(conn, smb_fname_parent);
 458         if (ret == -1) {
 459                 status = map_nt_error_from_unix(errno);
 460                 DEBUG(0,("change_dir_owner_to_parent: failed to stat parent "
 461                          "directory %s. Error was %s\n",
 462                          smb_fname_str_dbg(smb_fname_parent),
 463                          strerror(errno)));
 464                 goto out;
 465         }
 466
 467         /* We've already done an lstat into psbuf, and we know it's a
 468            directory. If we can cd into the directory and the dev/ino
 469            are the same then we can safely chown without races as
 470            we're locking the directory in place by being in it.  This
 471            should work on any UNIX (thanks tridge :-). JRA.
 472         */
 473
 474         saved_dir = vfs_GetWd(ctx,conn);
 475         if (!saved_dir) {
 476                 status = map_nt_error_from_unix(errno);
 477                 DEBUG(0,("change_dir_owner_to_parent: failed to get "
 478                          "current working directory. Error was %s\n",
 479                          strerror(errno)));
 480                 goto out;
 481         }
 482
 483         /* Chdir into the new path. */
 484         if (vfs_ChDir(conn, fname) == -1) {
 485                 status = map_nt_error_from_unix(errno);
 486                 DEBUG(0,("change_dir_owner_to_parent: failed to change "
 487                          "current working directory to %s. Error "
 488                          "was %s\n", fname, strerror(errno) ));
 489                 goto chdir;
 490         }
 491
 492         smb_fname_cwd = synthetic_smb_fname(ctx, ".", NULL, NULL);
 493         if (smb_fname_cwd == NULL) {
 494                 status = NT_STATUS_NO_MEMORY;
 495                 goto chdir;
 496         }
 497
 498         ret = SMB_VFS_STAT(conn, smb_fname_cwd);
 499         if (ret == -1) {
 500                 status = map_nt_error_from_unix(errno);
 501                 DEBUG(0,("change_dir_owner_to_parent: failed to stat "
 502                          "directory '.' (%s) Error was %s\n",
 503                          fname, strerror(errno)));
 504                 goto chdir;
 505         }
 506
 507         /* Ensure we're pointing at the same place. */
 508         if (smb_fname_cwd->st.st_ex_dev != psbuf->st_ex_dev ||
 509             smb_fname_cwd->st.st_ex_ino != psbuf->st_ex_ino) {
 510                 DEBUG(0,("change_dir_owner_to_parent: "
 511                          "device/inode on directory %s changed. "
 512                          "Refusing to chown !\n", fname ));
 513                 status = NT_STATUS_ACCESS_DENIED;
 514                 goto chdir;
 515         }
 516
 517         if (smb_fname_parent->st.st_ex_uid == smb_fname_cwd->st.st_ex_uid) {
 518                 /* Already this uid - no need to change. */
 519                 DEBUG(10,("change_dir_owner_to_parent: directory %s "
 520                         "is already owned by uid %d\n",
 521                         fname,
 522                         (int)smb_fname_cwd->st.st_ex_uid ));
 523                 status = NT_STATUS_OK;
 524                 goto chdir;
 525         }
 526
 527         become_root();
 528         ret = SMB_VFS_LCHOWN(conn, ".", smb_fname_parent->st.st_ex_uid,
 529                             (gid_t)-1);
 530         unbecome_root();
 531         if (ret == -1) {
 532                 status = map_nt_error_from_unix(errno);
 533                 DEBUG(10,("change_dir_owner_to_parent: failed to chown "
 534                           "directory %s to parent directory uid %u. "
 535                           "Error was %s\n", fname,
 536                           (unsigned int)smb_fname_parent->st.st_ex_uid,
 537                           strerror(errno) ));
 538         } else {
 539                 DEBUG(10,("change_dir_owner_to_parent: changed ownership of new "
 540                         "directory %s to parent directory uid %u.\n",
 541                         fname, (unsigned int)smb_fname_parent->st.st_ex_uid ));
 542                 /* Ensure the uid entry is updated. */
 543                 psbuf->st_ex_uid = smb_fname_parent->st.st_ex_uid;
 544         }
 545
 546  chdir:
 547         vfs_ChDir(conn,saved_dir);
 548  out:
 549         TALLOC_FREE(smb_fname_parent);
 550         TALLOC_FREE(smb_fname_cwd);
 551         return status;
 552 }
 553
 554 /****************************************************************************
 555  Open a file - returning a guaranteed ATOMIC indication of if the
 556  file was created or not.
 557 ****************************************************************************/
 558
 559 static NTSTATUS fd_open_atomic(struct connection_struct *conn,
 560                         files_struct *fsp,
 561                         int flags,
 562                         mode_t mode,
 563                         bool *file_created)
 564 {
 565         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 566         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 567
 568         *file_created = false;
 569
 570         if (!(flags & O_CREAT)) {
 571                 /*
 572                  * We're not creating the file, just pass through.
 573                  */
 574                 return fd_open(conn, fsp, flags, mode);
 575         }
 576
 577         if (flags & O_EXCL) {
 578                 /*
 579                  * Fail if already exists, just pass through.
 580                  */
 581                 status = fd_open(conn, fsp, flags, mode);
 582
 583                 /*
 584                  * Here we've opened with O_CREAT|O_EXCL. If that went
 585                  * NT_STATUS_OK, we *know* we created this file.
 586                  */
 587                 *file_created = NT_STATUS_IS_OK(status);
 588
 589                 return status;
 590         }
 591
 592         /*
 593          * Now it gets tricky. We have O_CREAT, but not O_EXCL.
 594          * To know absolutely if we created the file or not,
 595          * we can never call O_CREAT without O_EXCL. So if
 596          * we think the file existed, try without O_CREAT|O_EXCL.
 597          * If we think the file didn't exist, try with
 598          * O_CREAT|O_EXCL. Keep bouncing between these two
 599          * requests until either the file is created, or
 600          * opened. Either way, we keep going until we get
 601          * a returnable result (error, or open/create).
 602          */
 603
 604         while(1) {
 605                 int curr_flags = flags;
 606
 607                 if (file_existed) {
 608                         /* Just try open, do not create. */
 609                         curr_flags &= ~(O_CREAT);
 610                         status = fd_open(conn, fsp, curr_flags, mode);
 611                         if (NT_STATUS_EQUAL(status,
 612                                         NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 613                                 /*
 614                                  * Someone deleted it in the meantime.
 615                                  * Retry with O_EXCL.
 616                                  */
 617                                 file_existed = false;
 618                                 DEBUG(10,("fd_open_atomic: file %s existed. "
 619                                         "Retry.\n",
 620                                         smb_fname_str_dbg(fsp->fsp_name)));
 621                                         continue;
 622                         }
 623                 } else {
 624                         /* Try create exclusively, fail if it exists. */
 625                         curr_flags |= O_EXCL;
 626                         status = fd_open(conn, fsp, curr_flags, mode);
 627                         if (NT_STATUS_EQUAL(status,
 628                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
 629                                 /*
 630                                  * Someone created it in the meantime.
 631                                  * Retry without O_CREAT.
 632                                  */
 633                                 file_existed = true;
 634                                 DEBUG(10,("fd_open_atomic: file %s "
 635                                         "did not exist. Retry.\n",
 636                                         smb_fname_str_dbg(fsp->fsp_name)));
 637                                 continue;
 638                         }
 639                         if (NT_STATUS_IS_OK(status)) {
 640                                 /*
 641                                  * Here we've opened with O_CREAT|O_EXCL
 642                                  * and got success. We *know* we created
 643                                  * this file.
 644                                  */
 645                                 *file_created = true;
 646                         }
 647                 }
 648                 /* Create is done, or failed. */
 649                 break;
 650         }
 651         return status;
 652 }
 653
 654 /****************************************************************************
 655  Open a file.
 656 ****************************************************************************/
 657
 658 static NTSTATUS open_file(files_struct *fsp,
 659                           connection_struct *conn,
 660                           struct smb_request *req,
 661                           const char *parent_dir,
 662                           int flags,
 663                           mode_t unx_mode,
 664                           uint32 access_mask, /* client requested access mask. */
 665                           uint32 open_access_mask, /* what we're actually using in the open. */
 666                           bool *p_file_created)
 667 {
 668         struct smb_filename *smb_fname = fsp->fsp_name;
 669         NTSTATUS status = NT_STATUS_OK;
 670         int accmode = (flags & O_ACCMODE);
 671         int local_flags = flags;
 672         bool file_existed = VALID_STAT(fsp->fsp_name->st);
 673
 674         fsp->fh->fd = -1;
 675         errno = EPERM;
 676
 677         /* Check permissions */
 678
 679         /*
 680          * This code was changed after seeing a client open request
 681          * containing the open mode of (DENY_WRITE/read-only) with
 682          * the 'create if not exist' bit set. The previous code
 683          * would fail to open the file read only on a read-only share
 684          * as it was checking the flags parameter  directly against O_RDONLY,
 685          * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
 686          * JRA.
 687          */
 688
 689         if (!CAN_WRITE(conn)) {
 690                 /* It's a read-only share - fail if we wanted to write. */
 691                 if(accmode != O_RDONLY || (flags & O_TRUNC) || (flags & O_APPEND)) {
 692                         DEBUG(3,("Permission denied opening %s\n",
 693                                  smb_fname_str_dbg(smb_fname)));
 694                         return NT_STATUS_ACCESS_DENIED;
 695                 }
 696                 if (flags & O_CREAT) {
 697                         /* We don't want to write - but we must make sure that
 698                            O_CREAT doesn't create the file if we have write
 699                            access into the directory.
 700                         */
 701                         flags &= ~(O_CREAT|O_EXCL);
 702                         local_flags &= ~(O_CREAT|O_EXCL);
 703                 }
 704         }
 705
 706         /*
 707          * This little piece of insanity is inspired by the
 708          * fact that an NT client can open a file for O_RDONLY,
 709          * but set the create disposition to FILE_EXISTS_TRUNCATE.
 710          * If the client *can* write to the file, then it expects to
 711          * truncate the file, even though it is opening for readonly.
 712          * Quicken uses this stupid trick in backup file creation...
 713          * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
 714          * for helping track this one down. It didn't bite us in 2.0.x
 715          * as we always opened files read-write in that release. JRA.
 716          */
 717
 718         if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC)) {
 719                 DEBUG(10,("open_file: truncate requested on read-only open "
 720                           "for file %s\n", smb_fname_str_dbg(smb_fname)));
 721                 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
 722         }
 723
 724         if ((open_access_mask & (FILE_READ_DATA|FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_EXECUTE)) ||
 725             (!file_existed && (local_flags & O_CREAT)) ||
 726             ((local_flags & O_TRUNC) == O_TRUNC) ) {
 727                 const char *wild;
 728                 int ret;
 729
 730 #if defined(O_NONBLOCK) && defined(S_ISFIFO)
 731                 /*
 732                  * We would block on opening a FIFO with no one else on the
 733                  * other end. Do what we used to do and add O_NONBLOCK to the
 734                  * open flags. JRA.
 735                  */
 736
 737                 if (file_existed && S_ISFIFO(smb_fname->st.st_ex_mode)) {
 738                         local_flags &= ~O_TRUNC; /* Can't truncate a FIFO. */
 739                         local_flags |= O_NONBLOCK;
 740                 }
 741 #endif
 742
 743                 /* Don't create files with Microsoft wildcard characters. */
 744                 if (fsp->base_fsp) {
 745                         /*
 746                          * wildcard characters are allowed in stream names
 747                          * only test the basefilename
 748                          */
 749                         wild = fsp->base_fsp->fsp_name->base_name;
 750                 } else {
 751                         wild = smb_fname->base_name;
 752                 }
 753                 if ((local_flags & O_CREAT) && !file_existed &&
 754                     ms_has_wild(wild))  {
 755                         return NT_STATUS_OBJECT_NAME_INVALID;
 756                 }
 757
 758                 /* Can we access this file ? */
 759                 if (!fsp->base_fsp) {
 760                         /* Only do this check on non-stream open. */
 761                         if (file_existed) {
 762                                 status = smbd_check_access_rights(conn,
 763                                                 smb_fname,
 764                                                 false,
 765                                                 access_mask);
 766                         } else if (local_flags & O_CREAT){
 767                                 status = check_parent_access(conn,
 768                                                 smb_fname,
 769                                                 SEC_DIR_ADD_FILE);
 770                         } else {
 771                                 /* File didn't exist and no O_CREAT. */
 772                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 773                         }
 774                         if (!NT_STATUS_IS_OK(status)) {
 775                                 DEBUG(10,("open_file: "
 776                                         "%s on file "
 777                                         "%s returned %s\n",
 778                                         file_existed ?
 779                                                 "smbd_check_access_rights" :
 780                                                 "check_parent_access",
 781                                         smb_fname_str_dbg(smb_fname),
 782                                         nt_errstr(status) ));
 783                                 return status;
 784                         }
 785                 }
 786
 787                 /* Actually do the open */
 788                 status = fd_open_atomic(conn, fsp, local_flags,
 789                                 unx_mode, p_file_created);
 790                 if (!NT_STATUS_IS_OK(status)) {
 791                         DEBUG(3,("Error opening file %s (%s) (local_flags=%d) "
 792                                  "(flags=%d)\n", smb_fname_str_dbg(smb_fname),
 793                                  nt_errstr(status),local_flags,flags));
 794                         return status;
 795                 }
 796
 797                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 798                 if (ret == -1) {
 799                         /* If we have an fd, this stat should succeed. */
 800                         DEBUG(0,("Error doing fstat on open file %s "
 801                                 "(%s)\n",
 802                                 smb_fname_str_dbg(smb_fname),
 803                                 strerror(errno) ));
 804                         status = map_nt_error_from_unix(errno);
 805                         fd_close(fsp);
 806                         return status;
 807                 }
 808
 809                 if (*p_file_created) {
 810                         /* We created this file. */
 811
 812                         bool need_re_stat = false;
 813                         /* Do all inheritance work after we've
 814                            done a successful fstat call and filled
 815                            in the stat struct in fsp->fsp_name. */
 816
 817                         /* Inherit the ACL if required */
 818                         if (lp_inherit_perms(SNUM(conn))) {
 819                                 inherit_access_posix_acl(conn, parent_dir,
 820                                                          smb_fname->base_name,
 821                                                          unx_mode);
 822                                 need_re_stat = true;
 823                         }
 824
 825                         /* Change the owner if required. */
 826                         if (lp_inherit_owner(SNUM(conn))) {
 827                                 change_file_owner_to_parent(conn, parent_dir,
 828                                                             fsp);
 829                                 need_re_stat = true;
 830                         }
 831
 832                         if (need_re_stat) {
 833                                 ret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
 834                                 /* If we have an fd, this stat should succeed. */
 835                                 if (ret == -1) {
 836                                         DEBUG(0,("Error doing fstat on open file %s "
 837                                                  "(%s)\n",
 838                                                  smb_fname_str_dbg(smb_fname),
 839                                                  strerror(errno) ));
 840                                 }
 841                         }
 842
 843                         notify_fname(conn, NOTIFY_ACTION_ADDED,
 844                                      FILE_NOTIFY_CHANGE_FILE_NAME,
 845                                      smb_fname->base_name);
 846                 }
 847         } else {
 848                 fsp->fh->fd = -1; /* What we used to call a stat open. */
 849                 if (!file_existed) {
 850                         /* File must exist for a stat open. */
 851                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 852                 }
 853
 854                 status = smbd_check_access_rights(conn,
 855                                 smb_fname,
 856                                 false,
 857                                 access_mask);
 858
 859                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND) &&
 860                                 fsp->posix_open &&
 861                                 S_ISLNK(smb_fname->st.st_ex_mode)) {
 862                         /* This is a POSIX stat open for delete
 863                          * or rename on a symlink that points
 864                          * nowhere. Allow. */
 865                         DEBUG(10,("open_file: allowing POSIX "
 866                                   "open on bad symlink %s\n",
 867                                   smb_fname_str_dbg(smb_fname)));
 868                         status = NT_STATUS_OK;
 869                 }
 870
 871                 if (!NT_STATUS_IS_OK(status)) {
 872                         DEBUG(10,("open_file: "
 873                                 "smbd_check_access_rights on file "
 874                                 "%s returned %s\n",
 875                                 smb_fname_str_dbg(smb_fname),
 876                                 nt_errstr(status) ));
 877                         return status;
 878                 }
 879         }
 880
 881         /*
 882          * POSIX allows read-only opens of directories. We don't
 883          * want to do this (we use a different code path for this)
 884          * so catch a directory open and return an EISDIR. JRA.
 885          */
 886
 887         if(S_ISDIR(smb_fname->st.st_ex_mode)) {
 888                 fd_close(fsp);
 889                 errno = EISDIR;
 890                 return NT_STATUS_FILE_IS_A_DIRECTORY;
 891         }
 892
 893         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 894         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
 895         fsp->file_pid = req ? req->smbpid : 0;
 896         fsp->can_lock = True;
 897         fsp->can_read = ((access_mask & FILE_READ_DATA) != 0);
 898         fsp->can_write =
 899                 CAN_WRITE(conn) &&
 900                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) != 0);
 901         fsp->print_file = NULL;
 902         fsp->modified = False;
 903         fsp->sent_oplock_break = NO_BREAK_SENT;
 904         fsp->is_directory = False;
 905         if (conn->aio_write_behind_list &&
 906             is_in_path(smb_fname->base_name, conn->aio_write_behind_list,
 907                        conn->case_sensitive)) {
 908                 fsp->aio_write_behind = True;
 909         }
 910
 911         fsp->wcp = NULL; /* Write cache pointer. */
 912
 913         DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
 914                  conn->session_info->unix_info->unix_name,
 915                  smb_fname_str_dbg(smb_fname),
 916                  BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
 917                  conn->num_files_open));
 918
 919         errno = 0;
 920         return NT_STATUS_OK;
 921 }
 922
 923 /****************************************************************************
 924  Check if we can open a file with a share mode.
 925  Returns True if conflict, False if not.
 926 ****************************************************************************/
 927
 928 static bool share_conflict(struct share_mode_entry *entry,
 929                            uint32 access_mask,
 930                            uint32 share_access)
 931 {
 932         DEBUG(10,("share_conflict: entry->access_mask = 0x%x, "
 933                   "entry->share_access = 0x%x, "
 934                   "entry->private_options = 0x%x\n",
 935                   (unsigned int)entry->access_mask,
 936                   (unsigned int)entry->share_access,
 937                   (unsigned int)entry->private_options));
 938
 939         if (server_id_is_disconnected(&entry->pid)) {
 940                 /*
 941                  * note: cleanup should have been done by
 942                  * delay_for_batch_oplocks()
 943                  */
 944                 return false;
 945         }
 946
 947         DEBUG(10,("share_conflict: access_mask = 0x%x, share_access = 0x%x\n",
 948                   (unsigned int)access_mask, (unsigned int)share_access));
 949
 950         if ((entry->access_mask & (FILE_WRITE_DATA|
 951                                    FILE_APPEND_DATA|
 952                                    FILE_READ_DATA|
 953                                    FILE_EXECUTE|
 954                                    DELETE_ACCESS)) == 0) {
 955                 DEBUG(10,("share_conflict: No conflict due to "
 956                           "entry->access_mask = 0x%x\n",
 957                           (unsigned int)entry->access_mask ));
 958                 return False;
 959         }
 960
 961         if ((access_mask & (FILE_WRITE_DATA|
 962                             FILE_APPEND_DATA|
 963                             FILE_READ_DATA|
 964                             FILE_EXECUTE|
 965                             DELETE_ACCESS)) == 0) {
 966                 DEBUG(10,("share_conflict: No conflict due to "
 967                           "access_mask = 0x%x\n",
 968                           (unsigned int)access_mask ));
 969                 return False;
 970         }
 971
 972 #if 1 /* JRA TEST - Superdebug. */
 973 #define CHECK_MASK(num, am, right, sa, share) \
 974         DEBUG(10,("share_conflict: [%d] am (0x%x) & right (0x%x) = 0x%x\n", \
 975                 (unsigned int)(num), (unsigned int)(am), \
 976                 (unsigned int)(right), (unsigned int)(am)&(right) )); \
 977         DEBUG(10,("share_conflict: [%d] sa (0x%x) & share (0x%x) = 0x%x\n", \
 978                 (unsigned int)(num), (unsigned int)(sa), \
 979                 (unsigned int)(share), (unsigned int)(sa)&(share) )); \
 980         if (((am) & (right)) && !((sa) & (share))) { \
 981                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
 982 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
 983                         (unsigned int)(share) )); \
 984                 return True; \
 985         }
 986 #else
 987 #define CHECK_MASK(num, am, right, sa, share) \
 988         if (((am) & (right)) && !((sa) & (share))) { \
 989                 DEBUG(10,("share_conflict: check %d conflict am = 0x%x, right = 0x%x, \
 990 sa = 0x%x, share = 0x%x\n", (num), (unsigned int)(am), (unsigned int)(right), (unsigned int)(sa), \
 991                         (unsigned int)(share) )); \
 992                 return True; \
 993         }
 994 #endif
 995
 996         CHECK_MASK(1, entry->access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
 997                    share_access, FILE_SHARE_WRITE);
 998         CHECK_MASK(2, access_mask, FILE_WRITE_DATA | FILE_APPEND_DATA,
 999                    entry->share_access, FILE_SHARE_WRITE);
1000
1001         CHECK_MASK(3, entry->access_mask, FILE_READ_DATA | FILE_EXECUTE,
1002                    share_access, FILE_SHARE_READ);
1003         CHECK_MASK(4, access_mask, FILE_READ_DATA | FILE_EXECUTE,
1004                    entry->share_access, FILE_SHARE_READ);
1005
1006         CHECK_MASK(5, entry->access_mask, DELETE_ACCESS,
1007                    share_access, FILE_SHARE_DELETE);
1008         CHECK_MASK(6, access_mask, DELETE_ACCESS,
1009                    entry->share_access, FILE_SHARE_DELETE);
1010
1011         DEBUG(10,("share_conflict: No conflict.\n"));
1012         return False;
1013 }
1014
1015 #if defined(DEVELOPER)
1016 static void validate_my_share_entries(struct smbd_server_connection *sconn,
1017                                       int num,
1018                                       struct share_mode_entry *share_entry)
1019 {
1020         struct server_id self = messaging_server_id(sconn->msg_ctx);
1021         files_struct *fsp;
1022
1023         if (!serverid_equal(&self, &share_entry->pid)) {
1024                 return;
1025         }
1026
1027         if (is_deferred_open_entry(share_entry) &&
1028             !open_was_deferred(sconn, share_entry->op_mid))
1029         {
1030                 char *str = talloc_asprintf(talloc_tos(),
1031                         "Got a deferred entry without a request: "
1032                         "PANIC: %s\n",
1033                         share_mode_str(talloc_tos(), num, share_entry));
1034                 smb_panic(str);
1035         }
1036
1037         if (!is_valid_share_mode_entry(share_entry)) {
1038                 return;
1039         }
1040
1041         fsp = file_find_dif(sconn, share_entry->id,
1042                             share_entry->share_file_id);
1043         if (!fsp) {
1044                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1045                          share_mode_str(talloc_tos(), num, share_entry) ));
1046                 smb_panic("validate_my_share_entries: Cannot match a "
1047                           "share entry with an open file\n");
1048         }
1049
1050         if (is_deferred_open_entry(share_entry)) {
1051                 goto panic;
1052         }
1053
1054         if ((share_entry->op_type == NO_OPLOCK) &&
1055             (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK))
1056         {
1057                 /* Someone has already written to it, but I haven't yet
1058                  * noticed */
1059                 return;
1060         }
1061
1062         if (((uint16)fsp->oplock_type) != share_entry->op_type) {
1063                 goto panic;
1064         }
1065
1066         return;
1067
1068  panic:
1069         {
1070                 char *str;
1071                 DEBUG(0,("validate_my_share_entries: PANIC : %s\n",
1072                          share_mode_str(talloc_tos(), num, share_entry) ));
1073                 str = talloc_asprintf(talloc_tos(),
1074                         "validate_my_share_entries: "
1075                         "file %s, oplock_type = 0x%x, op_type = 0x%x\n",
1076                          fsp->fsp_name->base_name,
1077                          (unsigned int)fsp->oplock_type,
1078                          (unsigned int)share_entry->op_type );
1079                 smb_panic(str);
1080         }
1081 }
1082 #endif
1083
1084 bool is_stat_open(uint32 access_mask)
1085 {
1086         const uint32_t stat_open_bits =
1087                 (SYNCHRONIZE_ACCESS|
1088                  FILE_READ_ATTRIBUTES|
1089                  FILE_WRITE_ATTRIBUTES);
1090
1091         return (((access_mask &  stat_open_bits) != 0) &&
1092                 ((access_mask & ~stat_open_bits) == 0));
1093 }
1094
1095 /****************************************************************************
1096  Deal with share modes
1097  Invarient: Share mode must be locked on entry and exit.
1098  Returns -1 on error, or number of share modes on success (may be zero).
1099 ****************************************************************************/
1100
1101 static NTSTATUS open_mode_check(connection_struct *conn,
1102                                 struct share_mode_lock *lck,
1103                                 uint32_t name_hash,
1104                                 uint32 access_mask,
1105                                 uint32 share_access,
1106                                 uint32 create_options,
1107                                 bool *file_existed)
1108 {
1109         int i;
1110
1111         if(lck->data->num_share_modes == 0) {
1112                 return NT_STATUS_OK;
1113         }
1114
1115         /* A delete on close prohibits everything */
1116
1117         if (is_delete_on_close_set(lck, name_hash)) {
1118                 /*
1119                  * Check the delete on close token
1120                  * is valid. It could have been left
1121                  * after a server crash.
1122                  */
1123                 for(i = 0; i < lck->data->num_share_modes; i++) {
1124                         if (!share_mode_stale_pid(lck->data, i)) {
1125
1126                                 *file_existed = true;
1127
1128                                 return NT_STATUS_DELETE_PENDING;
1129                         }
1130                 }
1131                 return NT_STATUS_OK;
1132         }
1133
1134         if (is_stat_open(access_mask)) {
1135                 /* Stat open that doesn't trigger oplock breaks or share mode
1136                  * checks... ! JRA. */
1137                 return NT_STATUS_OK;
1138         }
1139
1140         /*
1141          * Check if the share modes will give us access.
1142          */
1143
1144 #if defined(DEVELOPER)
1145         for(i = 0; i < lck->data->num_share_modes; i++) {
1146                 validate_my_share_entries(conn->sconn, i,
1147                                           &lck->data->share_modes[i]);
1148         }
1149 #endif
1150
1151         /* Now we check the share modes, after any oplock breaks. */
1152         for(i = 0; i < lck->data->num_share_modes; i++) {
1153
1154                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1155                         continue;
1156                 }
1157
1158                 /* someone else has a share lock on it, check to see if we can
1159                  * too */
1160                 if (share_conflict(&lck->data->share_modes[i],
1161                                    access_mask, share_access)) {
1162
1163                         if (share_mode_stale_pid(lck->data, i)) {
1164                                 continue;
1165                         }
1166
1167                         *file_existed = true;
1168
1169                         return NT_STATUS_SHARING_VIOLATION;
1170                 }
1171         }
1172
1173         if (lck->data->num_share_modes != 0) {
1174                 *file_existed = true;
1175         }
1176
1177         return NT_STATUS_OK;
1178 }
1179
1180 /*
1181  * Send a break message to the oplock holder and delay the open for
1182  * our client.
1183  */
1184
1185 static NTSTATUS send_break_message(files_struct *fsp,
1186                                         struct share_mode_entry *exclusive,
1187                                         uint64_t mid,
1188                                         int oplock_request)
1189 {
1190         NTSTATUS status;
1191         char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
1192
1193         DEBUG(10, ("Sending break request to PID %s\n",
1194                    procid_str_static(&exclusive->pid)));
1195         exclusive->op_mid = mid;
1196
1197         /* Create the message. */
1198         share_mode_entry_to_message(msg, exclusive);
1199
1200         /* Add in the FORCE_OPLOCK_BREAK_TO_NONE bit in the message if set. We
1201            don't want this set in the share mode struct pointed to by lck. */
1202
1203         if (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE) {
1204                 SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,
1205                         exclusive->op_type | FORCE_OPLOCK_BREAK_TO_NONE);
1206         }
1207
1208         status = messaging_send_buf(fsp->conn->sconn->msg_ctx, exclusive->pid,
1209                                     MSG_SMB_BREAK_REQUEST,
1210                                     (uint8 *)msg,
1211                                     MSG_SMB_SHARE_MODE_ENTRY_SIZE);
1212         if (!NT_STATUS_IS_OK(status)) {
1213                 DEBUG(3, ("Could not send oplock break message: %s\n",
1214                           nt_errstr(status)));
1215         }
1216
1217         return status;
1218 }
1219
1220 /*
1221  * Return share_mode_entry pointers for :
1222  * 1). Batch oplock entry.
1223  * 2). Batch or exclusive oplock entry (may be identical to #1).
1224  * bool have_level2_oplock
1225  * bool have_no_oplock.
1226  * Do internal consistency checks on the share mode for a file.
1227  */
1228
1229 static void find_oplock_types(files_struct *fsp,
1230                                 int oplock_request,
1231                                 const struct share_mode_lock *lck,
1232                                 struct share_mode_entry **pp_batch,
1233                                 struct share_mode_entry **pp_ex_or_batch,
1234                                 bool *got_level2,
1235                                 bool *got_no_oplock)
1236 {
1237         int i;
1238
1239         *pp_batch = NULL;
1240         *pp_ex_or_batch = NULL;
1241         *got_level2 = false;
1242         *got_no_oplock = false;
1243
1244         /* Ignore stat or internal opens, as is done in
1245                 delay_for_batch_oplocks() and
1246                 delay_for_exclusive_oplocks().
1247          */
1248         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1249                 return;
1250         }
1251
1252         for (i=0; i<lck->data->num_share_modes; i++) {
1253                 if (!is_valid_share_mode_entry(&lck->data->share_modes[i])) {
1254                         continue;
1255                 }
1256
1257                 if (lck->data->share_modes[i].op_type == NO_OPLOCK &&
1258                                 is_stat_open(lck->data->share_modes[i].access_mask)) {
1259                         /* We ignore stat opens in the table - they
1260                            always have NO_OPLOCK and never get or
1261                            cause breaks. JRA. */
1262                         continue;
1263                 }
1264
1265                 if (BATCH_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1266                         /* batch - can only be one. */
1267                         if (share_mode_stale_pid(lck->data, i)) {
1268                                 DEBUG(10, ("Found stale batch oplock\n"));
1269                                 continue;
1270                         }
1271                         if (*pp_ex_or_batch || *pp_batch || *got_level2 || *got_no_oplock) {
1272                                 smb_panic("Bad batch oplock entry.");
1273                         }
1274                         *pp_batch = &lck->data->share_modes[i];
1275                 }
1276
1277                 if (EXCLUSIVE_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1278                         if (share_mode_stale_pid(lck->data, i)) {
1279                                 DEBUG(10, ("Found stale duplicate oplock\n"));
1280                                 continue;
1281                         }
1282                         /* Exclusive or batch - can only be one. */
1283                         if (*pp_ex_or_batch || *got_level2 || *got_no_oplock) {
1284                                 smb_panic("Bad exclusive or batch oplock entry.");
1285                         }
1286                         *pp_ex_or_batch = &lck->data->share_modes[i];
1287                 }
1288
1289                 if (LEVEL_II_OPLOCK_TYPE(lck->data->share_modes[i].op_type)) {
1290                         if (*pp_batch || *pp_ex_or_batch) {
1291                                 if (share_mode_stale_pid(lck->data, i)) {
1292                                         DEBUG(10, ("Found stale LevelII "
1293                                                    "oplock\n"));
1294                                         continue;
1295                                 }
1296                                 smb_panic("Bad levelII oplock entry.");
1297                         }
1298                         *got_level2 = true;
1299                 }
1300
1301                 if (lck->data->share_modes[i].op_type == NO_OPLOCK) {
1302                         if (*pp_batch || *pp_ex_or_batch) {
1303                                 if (share_mode_stale_pid(lck->data, i)) {
1304                                         DEBUG(10, ("Found stale NO_OPLOCK "
1305                                                    "entry\n"));
1306                                         continue;
1307                                 }
1308                                 smb_panic("Bad no oplock entry.");
1309                         }
1310                         *got_no_oplock = true;
1311                 }
1312         }
1313 }
1314
1315 static bool delay_for_batch_oplocks(files_struct *fsp,
1316                                         uint64_t mid,
1317                                         int oplock_request,
1318                                         struct share_mode_entry *batch_entry)
1319 {
1320         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1321                 return false;
1322         }
1323         if (batch_entry == NULL) {
1324                 return false;
1325         }
1326
1327         if (server_id_is_disconnected(&batch_entry->pid)) {
1328                 /*
1329                  * TODO: clean up.
1330                  * This could be achieved by sending a break message
1331                  * to ourselves. Special considerations for files
1332                  * with delete_on_close flag set!
1333                  *
1334                  * For now we keep it simple and do not
1335                  * allow delete on close for durable handles.
1336                  */
1337                 return false;
1338         }
1339
1340         /* Found a batch oplock */
1341         send_break_message(fsp, batch_entry, mid, oplock_request);
1342         return true;
1343 }
1344
1345 static bool delay_for_exclusive_oplocks(files_struct *fsp,
1346                                         uint64_t mid,
1347                                         int oplock_request,
1348                                         struct share_mode_entry *ex_entry)
1349 {
1350         if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
1351                 return false;
1352         }
1353         if (ex_entry == NULL) {
1354                 return false;
1355         }
1356
1357         if (server_id_is_disconnected(&ex_entry->pid)) {
1358                 /*
1359                  * since only durable handles can get disconnected,
1360                  * and we can only get durable handles with batch oplocks,
1361                  * this should actually never be reached...
1362                  */
1363                 return false;
1364         }
1365
1366         send_break_message(fsp, ex_entry, mid, oplock_request);
1367         return true;
1368 }
1369
1370 static bool file_has_brlocks(files_struct *fsp)
1371 {
1372         struct byte_range_lock *br_lck;
1373
1374         br_lck = brl_get_locks_readonly(fsp);
1375         if (!br_lck)
1376                 return false;
1377
1378         return br_lck->num_locks > 0 ? true : false;
1379 }
1380
1381 static void grant_fsp_oplock_type(files_struct *fsp,
1382                                 int oplock_request,
1383                                 bool got_level2_oplock,
1384                                 bool got_a_none_oplock)
1385 {
1386         bool allow_level2 = (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
1387                             lp_level2_oplocks(SNUM(fsp->conn));
1388
1389         /* Start by granting what the client asked for,
1390            but ensure no SAMBA_PRIVATE bits can be set. */
1391         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
1392
1393         if (oplock_request & INTERNAL_OPEN_ONLY) {
1394                 /* No oplocks on internal open. */
1395                 fsp->oplock_type = NO_OPLOCK;
1396                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1397                         fsp->oplock_type, fsp_str_dbg(fsp)));
1398                 return;
1399         }
1400
1401         if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
1402                 DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
1403                         fsp_str_dbg(fsp)));
1404                 fsp->oplock_type = NO_OPLOCK;
1405         }
1406
1407         if (is_stat_open(fsp->access_mask)) {
1408                 /* Leave the value already set. */
1409                 DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1410                         fsp->oplock_type, fsp_str_dbg(fsp)));
1411                 return;
1412         }
1413
1414         /*
1415          * Match what was requested (fsp->oplock_type) with
1416          * what was found in the existing share modes.
1417          */
1418
1419         if (got_a_none_oplock) {
1420                 fsp->oplock_type = NO_OPLOCK;
1421         } else if (got_level2_oplock) {
1422                 if (fsp->oplock_type == NO_OPLOCK ||
1423                                 fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
1424                         /* Store a level2 oplock, but don't tell the client */
1425                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1426                 } else {
1427                         fsp->oplock_type = LEVEL_II_OPLOCK;
1428                 }
1429         } else {
1430                 /* All share_mode_entries are placeholders or deferred.
1431                  * Silently upgrade to fake levelII if the client didn't
1432                  * ask for an oplock. */
1433                 if (fsp->oplock_type == NO_OPLOCK) {
1434                         /* Store a level2 oplock, but don't tell the client */
1435                         fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1436                 }
1437         }
1438
1439         /*
1440          * Don't grant level2 to clients that don't want them
1441          * or if we've turned them off.
1442          */
1443         if (fsp->oplock_type == LEVEL_II_OPLOCK && !allow_level2) {
1444                 fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
1445         }
1446
1447         DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
1448                   fsp->oplock_type, fsp_str_dbg(fsp)));
1449 }
1450
1451 static bool request_timed_out(struct timeval request_time,
1452                               struct timeval timeout)
1453 {
1454         struct timeval now, end_time;
1455         GetTimeOfDay(&now);
1456         end_time = timeval_sum(&request_time, &timeout);
1457         return (timeval_compare(&end_time, &now) < 0);
1458 }
1459
1460 /****************************************************************************
1461  Handle the 1 second delay in returning a SHARING_VIOLATION error.
1462 ****************************************************************************/
1463
1464 static void defer_open(struct share_mode_lock *lck,
1465                        struct timeval request_time,
1466                        struct timeval timeout,
1467                        struct smb_request *req,
1468                        struct deferred_open_record *state)
1469 {
1470         struct server_id self = messaging_server_id(req->sconn->msg_ctx);
1471
1472         /* Paranoia check */
1473
1474         if (lck) {
1475                 int i;
1476
1477                 for (i=0; i<lck->data->num_share_modes; i++) {
1478                         struct share_mode_entry *e = &lck->data->share_modes[i];
1479
1480                         if (is_deferred_open_entry(e) &&
1481                             serverid_equal(&self, &e->pid) &&
1482                             (e->op_mid == req->mid)) {
1483                                 DEBUG(0, ("Trying to defer an already deferred "
1484                                         "request: mid=%llu, exiting\n",
1485                                         (unsigned long long)req->mid));
1486                                 TALLOC_FREE(lck);
1487                                 exit_server("attempt to defer a deferred request");
1488                         }
1489                 }
1490         }
1491
1492         /* End paranoia check */
1493
1494         DEBUG(10,("defer_open_sharing_error: time [%u.%06u] adding deferred "
1495                   "open entry for mid %llu\n",
1496                   (unsigned int)request_time.tv_sec,
1497                   (unsigned int)request_time.tv_usec,
1498                   (unsigned long long)req->mid));
1499
1500         if (!push_deferred_open_message_smb(req, request_time, timeout,
1501                                        state->id, (char *)state, sizeof(*state))) {
1502                 TALLOC_FREE(lck);
1503                 exit_server("push_deferred_open_message_smb failed");
1504         }
1505         if (lck) {
1506                 add_deferred_open(lck, req->mid, request_time, self, state->id);
1507         }
1508 }
1509
1510
1511 /****************************************************************************
1512  On overwrite open ensure that the attributes match.
1513 ****************************************************************************/
1514
1515 static bool open_match_attributes(connection_struct *conn,
1516                                   uint32 old_dos_attr,
1517                                   uint32 new_dos_attr,
1518                                   mode_t existing_unx_mode,
1519                                   mode_t new_unx_mode,
1520                                   mode_t *returned_unx_mode)
1521 {
1522         uint32 noarch_old_dos_attr, noarch_new_dos_attr;
1523
1524         noarch_old_dos_attr = (old_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1525         noarch_new_dos_attr = (new_dos_attr & ~FILE_ATTRIBUTE_ARCHIVE);
1526
1527         if((noarch_old_dos_attr == 0 && noarch_new_dos_attr != 0) ||
1528            (noarch_old_dos_attr != 0 && ((noarch_old_dos_attr & noarch_new_dos_attr) == noarch_old_dos_attr))) {
1529                 *returned_unx_mode = new_unx_mode;
1530         } else {
1531                 *returned_unx_mode = (mode_t)0;
1532         }
1533
1534         DEBUG(10,("open_match_attributes: old_dos_attr = 0x%x, "
1535                   "existing_unx_mode = 0%o, new_dos_attr = 0x%x "
1536                   "returned_unx_mode = 0%o\n",
1537                   (unsigned int)old_dos_attr,
1538                   (unsigned int)existing_unx_mode,
1539                   (unsigned int)new_dos_attr,
1540                   (unsigned int)*returned_unx_mode ));
1541
1542         /* If we're mapping SYSTEM and HIDDEN ensure they match. */
1543         if (lp_map_system(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1544                 if ((old_dos_attr & FILE_ATTRIBUTE_SYSTEM) &&
1545                     !(new_dos_attr & FILE_ATTRIBUTE_SYSTEM)) {
1546                         return False;
1547                 }
1548         }
1549         if (lp_map_hidden(SNUM(conn)) || lp_store_dos_attributes(SNUM(conn))) {
1550                 if ((old_dos_attr & FILE_ATTRIBUTE_HIDDEN) &&
1551                     !(new_dos_attr & FILE_ATTRIBUTE_HIDDEN)) {
1552                         return False;
1553                 }
1554         }
1555         return True;
1556 }
1557
1558 /****************************************************************************
1559  Special FCB or DOS processing in the case of a sharing violation.
1560  Try and find a duplicated file handle.
1561 ****************************************************************************/
1562
1563 static NTSTATUS fcb_or_dos_open(struct smb_request *req,
1564                                 connection_struct *conn,
1565                                 files_struct *fsp_to_dup_into,
1566                                 const struct smb_filename *smb_fname,
1567                                 struct file_id id,
1568                                 uint16 file_pid,
1569                                 uint64_t vuid,
1570                                 uint32 access_mask,
1571                                 uint32 share_access,
1572                                 uint32 create_options)
1573 {
1574         files_struct *fsp;
1575
1576         DEBUG(5,("fcb_or_dos_open: attempting old open semantics for "
1577                  "file %s.\n", smb_fname_str_dbg(smb_fname)));
1578
1579         for(fsp = file_find_di_first(conn->sconn, id); fsp;
1580             fsp = file_find_di_next(fsp)) {
1581
1582                 DEBUG(10,("fcb_or_dos_open: checking file %s, fd = %d, "
1583                           "vuid = %llu, file_pid = %u, private_options = 0x%x "
1584                           "access_mask = 0x%x\n", fsp_str_dbg(fsp),
1585                           fsp->fh->fd, (unsigned long long)fsp->vuid,
1586                           (unsigned int)fsp->file_pid,
1587                           (unsigned int)fsp->fh->private_options,
1588                           (unsigned int)fsp->access_mask ));
1589
1590                 if (fsp != fsp_to_dup_into &&
1591                     fsp->fh->fd != -1 &&
1592                     fsp->vuid == vuid &&
1593                     fsp->file_pid == file_pid &&
1594                     (fsp->fh->private_options & (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS |
1595                                                  NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) &&
1596                     (fsp->access_mask & FILE_WRITE_DATA) &&
1597                     strequal(fsp->fsp_name->base_name, smb_fname->base_name) &&
1598                     strequal(fsp->fsp_name->stream_name,
1599                              smb_fname->stream_name)) {
1600                         DEBUG(10,("fcb_or_dos_open: file match\n"));
1601                         break;
1602                 }
1603         }
1604
1605         if (!fsp) {
1606                 return NT_STATUS_NOT_FOUND;
1607         }
1608
1609         /* quite an insane set of semantics ... */
1610         if (is_executable(smb_fname->base_name) &&
1611             (fsp->fh->private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS)) {
1612                 DEBUG(10,("fcb_or_dos_open: file fail due to is_executable.\n"));
1613                 return NT_STATUS_INVALID_PARAMETER;
1614         }
1615
1616         /* We need to duplicate this fsp. */
1617         return dup_file_fsp(req, fsp, access_mask, share_access,
1618                             create_options, fsp_to_dup_into);
1619 }
1620
1621 static void schedule_defer_open(struct share_mode_lock *lck,
1622                                 struct timeval request_time,
1623                                 struct smb_request *req)
1624 {
1625         struct deferred_open_record state;
1626
1627         /* This is a relative time, added to the absolute
1628            request_time value to get the absolute timeout time.
1629            Note that if this is the second or greater time we enter
1630            this codepath for this particular request mid then
1631            request_time is left as the absolute time of the *first*
1632            time this request mid was processed. This is what allows
1633            the request to eventually time out. */
1634
1635         struct timeval timeout;
1636
1637         /* Normally the smbd we asked should respond within
1638          * OPLOCK_BREAK_TIMEOUT seconds regardless of whether
1639          * the client did, give twice the timeout as a safety
1640          * measure here in case the other smbd is stuck
1641          * somewhere else. */
1642
1643         timeout = timeval_set(OPLOCK_BREAK_TIMEOUT*2, 0);
1644
1645         /* Nothing actually uses state.delayed_for_oplocks
1646            but it's handy to differentiate in debug messages
1647            between a 30 second delay due to oplock break, and
1648            a 1 second delay for share mode conflicts. */
1649
1650         state.delayed_for_oplocks = True;
1651         state.async_open = false;
1652         state.id = lck->data->id;
1653
1654         if (!request_timed_out(request_time, timeout)) {
1655                 defer_open(lck, request_time, timeout, req, &state);
1656         }
1657 }
1658
1659 /****************************************************************************
1660  Reschedule an open call that went asynchronous.
1661 ****************************************************************************/
1662
1663 static void schedule_async_open(struct timeval request_time,
1664                                 struct smb_request *req)
1665 {
1666         struct deferred_open_record state;
1667         struct timeval timeout;
1668
1669         timeout = timeval_set(20, 0);
1670
1671         ZERO_STRUCT(state);
1672         state.delayed_for_oplocks = false;
1673         state.async_open = true;
1674
1675         if (!request_timed_out(request_time, timeout)) {
1676                 defer_open(NULL, request_time, timeout, req, &state);
1677         }
1678 }
1679
1680 /****************************************************************************
1681  Work out what access_mask to use from what the client sent us.
1682 ****************************************************************************/
1683
1684 static NTSTATUS smbd_calculate_maximum_allowed_access(
1685         connection_struct *conn,
1686         const struct smb_filename *smb_fname,
1687         bool use_privs,
1688         uint32_t *p_access_mask)
1689 {
1690         struct security_descriptor *sd;
1691         uint32_t access_granted;
1692         NTSTATUS status;
1693
1694         if (!use_privs && (get_current_uid(conn) == (uid_t)0)) {
1695                 *p_access_mask |= FILE_GENERIC_ALL;
1696                 return NT_STATUS_OK;
1697         }
1698
1699         status = SMB_VFS_GET_NT_ACL(conn, smb_fname->base_name,
1700                                     (SECINFO_OWNER |
1701                                      SECINFO_GROUP |
1702                                      SECINFO_DACL),
1703                                     talloc_tos(), &sd);
1704
1705         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1706                 /*
1707                  * File did not exist
1708                  */
1709                 *p_access_mask = FILE_GENERIC_ALL;
1710                 return NT_STATUS_OK;
1711         }
1712         if (!NT_STATUS_IS_OK(status)) {
1713                 DEBUG(10,("Could not get acl on file %s: %s\n",
1714                           smb_fname_str_dbg(smb_fname),
1715                           nt_errstr(status)));
1716                 return NT_STATUS_ACCESS_DENIED;
1717         }
1718
1719         /*
1720          * If we can access the path to this file, by
1721          * default we have FILE_READ_ATTRIBUTES from the
1722          * containing directory. See the section:
1723          * "Algorithm to Check Access to an Existing File"
1724          * in MS-FSA.pdf.
1725          *
1726          * se_file_access_check()
1727          * also takes care of owner WRITE_DAC and READ_CONTROL.
1728          */
1729         status = se_file_access_check(sd,
1730                                  get_current_nttok(conn),
1731                                  use_privs,
1732                                  (*p_access_mask & ~FILE_READ_ATTRIBUTES),
1733                                  &access_granted);
1734
1735         TALLOC_FREE(sd);
1736
1737         if (!NT_STATUS_IS_OK(status)) {
1738                 DEBUG(10, ("Access denied on file %s: "
1739                            "when calculating maximum access\n",
1740                            smb_fname_str_dbg(smb_fname)));
1741                 return NT_STATUS_ACCESS_DENIED;
1742         }
1743         *p_access_mask = (access_granted | FILE_READ_ATTRIBUTES);
1744
1745         if (!(access_granted & DELETE_ACCESS)) {
1746                 if (can_delete_file_in_directory(conn, smb_fname)) {
1747                         *p_access_mask |= DELETE_ACCESS;
1748                 }
1749         }
1750
1751         return NT_STATUS_OK;
1752 }
1753
1754 NTSTATUS smbd_calculate_access_mask(connection_struct *conn,
1755                                     const struct smb_filename *smb_fname,
1756                                     bool use_privs,
1757                                     uint32_t access_mask,
1758                                     uint32_t *access_mask_out)
1759 {
1760         NTSTATUS status;
1761         uint32_t orig_access_mask = access_mask;
1762         uint32_t rejected_share_access;
1763
1764         /*
1765          * Convert GENERIC bits to specific bits.
1766          */
1767
1768         se_map_generic(&access_mask, &file_generic_mapping);
1769
1770         /* Calculate MAXIMUM_ALLOWED_ACCESS if requested. */
1771         if (access_mask & MAXIMUM_ALLOWED_ACCESS) {
1772
1773                 status = smbd_calculate_maximum_allowed_access(
1774                         conn, smb_fname, use_privs, &access_mask);
1775
1776                 if (!NT_STATUS_IS_OK(status)) {
1777                         return status;
1778                 }
1779
1780                 access_mask &= conn->share_access;
1781         }
1782
1783         rejected_share_access = access_mask & ~(conn->share_access);
1784
1785         if (rejected_share_access) {
1786                 DEBUG(10, ("smbd_calculate_access_mask: Access denied on "
1787                         "file %s: rejected by share access mask[0x%08X] "
1788                         "orig[0x%08X] mapped[0x%08X] reject[0x%08X]\n",
1789                         smb_fname_str_dbg(smb_fname),
1790                         conn->share_access,
1791                         orig_access_mask, access_mask,
1792                         rejected_share_access));
1793                 return NT_STATUS_ACCESS_DENIED;
1794         }
1795
1796         *access_mask_out = access_mask;
1797         return NT_STATUS_OK;
1798 }
1799
1800 /****************************************************************************
1801  Remove the deferred open entry under lock.
1802 ****************************************************************************/
1803
1804 void remove_deferred_open_entry(struct file_id id, uint64_t mid,
1805                                 struct server_id pid)
1806 {
1807         struct share_mode_lock *lck = get_existing_share_mode_lock(
1808                 talloc_tos(), id);
1809         if (lck == NULL) {
1810                 DEBUG(0, ("could not get share mode lock\n"));
1811                 return;
1812         }
1813         del_deferred_open_entry(lck, mid, pid);
1814         TALLOC_FREE(lck);
1815 }
1816
1817 /****************************************************************************
1818  Return true if this is a state pointer to an asynchronous create.
1819 ****************************************************************************/
1820
1821 bool is_deferred_open_async(const void *ptr)
1822 {
1823         const struct deferred_open_record *state = (const struct deferred_open_record *)ptr;
1824
1825         return state->async_open;
1826 }
1827
1828 static bool clear_ads(uint32_t create_disposition)
1829 {
1830         bool ret = false;
1831
1832         switch (create_disposition) {
1833         case FILE_SUPERSEDE:
1834         case FILE_OVERWRITE_IF:
1835         case FILE_OVERWRITE:
1836                 ret = true;
1837                 break;
1838         default:
1839                 break;
1840         }
1841         return ret;
1842 }
1843
1844 static int disposition_to_open_flags(uint32_t create_disposition)
1845 {
1846         int ret = 0;
1847
1848         /*
1849          * Currently we're using FILE_SUPERSEDE as the same as
1850          * FILE_OVERWRITE_IF but they really are
1851          * different. FILE_SUPERSEDE deletes an existing file
1852          * (requiring delete access) then recreates it.
1853          */
1854
1855         switch (create_disposition) {
1856         case FILE_SUPERSEDE:
1857         case FILE_OVERWRITE_IF:
1858                 /*
1859                  * If file exists replace/overwrite. If file doesn't
1860                  * exist create.
1861                  */
1862                 ret = O_CREAT|O_TRUNC;
1863                 break;
1864
1865         case FILE_OPEN:
1866                 /*
1867                  * If file exists open. If file doesn't exist error.
1868                  */
1869                 ret = 0;
1870                 break;
1871
1872         case FILE_OVERWRITE:
1873                 /*
1874                  * If file exists overwrite. If file doesn't exist
1875                  * error.
1876                  */
1877                 ret = O_TRUNC;
1878                 break;
1879
1880         case FILE_CREATE:
1881                 /*
1882                  * If file exists error. If file doesn't exist create.
1883                  */
1884                 ret = O_CREAT|O_EXCL;
1885                 break;
1886
1887         case FILE_OPEN_IF:
1888                 /*
1889                  * If file exists open. If file doesn't exist create.
1890                  */
1891                 ret = O_CREAT;
1892                 break;
1893         }
1894         return ret;
1895 }
1896
1897 static int calculate_open_access_flags(uint32_t access_mask,
1898                                        int oplock_request,
1899                                        uint32_t private_flags)
1900 {
1901         bool need_write, need_read;
1902
1903         /*
1904          * Note that we ignore the append flag as append does not
1905          * mean the same thing under DOS and Unix.
1906          */
1907
1908         need_write =
1909                 ((access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ||
1910                  (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE));
1911
1912         if (!need_write) {
1913                 return O_RDONLY;
1914         }
1915
1916         /* DENY_DOS opens are always underlying read-write on the
1917            file handle, no matter what the requested access mask
1918            says. */
1919
1920         need_read =
1921                 ((private_flags & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) ||
1922                  access_mask & (FILE_READ_ATTRIBUTES|FILE_READ_DATA|
1923                                 FILE_READ_EA|FILE_EXECUTE));
1924
1925         if (!need_read) {
1926                 return O_WRONLY;
1927         }
1928         return O_RDWR;
1929 }
1930
1931 /****************************************************************************
1932  Open a file with a share mode. Passed in an already created files_struct *.
1933 ****************************************************************************/
1934
1935 static NTSTATUS open_file_ntcreate(connection_struct *conn,
1936                             struct smb_request *req,
1937                             uint32 access_mask,         /* access bits (FILE_READ_DATA etc.) */
1938                             uint32 share_access,        /* share constants (FILE_SHARE_READ etc) */
1939                             uint32 create_disposition,  /* FILE_OPEN_IF etc. */
1940                             uint32 create_options,      /* options such as delete on close. */
1941                             uint32 new_dos_attributes,  /* attributes used for new file. */
1942                             int oplock_request,         /* internal Samba oplock codes. */
1943                                                         /* Information (FILE_EXISTS etc.) */
1944                             uint32_t private_flags,     /* Samba specific flags. */
1945                             int *pinfo,
1946                             files_struct *fsp)
1947 {
1948         struct smb_filename *smb_fname = fsp->fsp_name;
1949         int flags=0;
1950         int flags2=0;
1951         bool file_existed = VALID_STAT(smb_fname->st);
1952         bool def_acl = False;
1953         bool posix_open = False;
1954         bool new_file_created = False;
1955         bool first_open_attempt = true;
1956         NTSTATUS fsp_open = NT_STATUS_ACCESS_DENIED;
1957         mode_t new_unx_mode = (mode_t)0;
1958         mode_t unx_mode = (mode_t)0;
1959         int info;
1960         uint32 existing_dos_attributes = 0;
1961         struct timeval request_time = timeval_zero();
1962         struct share_mode_lock *lck = NULL;
1963         uint32 open_access_mask = access_mask;
1964         NTSTATUS status;
1965         char *parent_dir;
1966         SMB_STRUCT_STAT saved_stat = smb_fname->st;
1967         struct share_mode_entry *batch_entry = NULL;
1968         struct share_mode_entry *exclusive_entry = NULL;
1969         bool got_level2_oplock = false;
1970         bool got_a_none_oplock = false;
1971         struct timespec old_write_time;
1972         struct file_id id;
1973
1974         if (conn->printer) {
1975                 /*
1976                  * Printers are handled completely differently.
1977                  * Most of the passed parameters are ignored.
1978                  */
1979
1980                 if (pinfo) {
1981                         *pinfo = FILE_WAS_CREATED;
1982                 }
1983
1984                 DEBUG(10, ("open_file_ntcreate: printer open fname=%s\n",
1985                            smb_fname_str_dbg(smb_fname)));
1986
1987                 if (!req) {
1988                         DEBUG(0,("open_file_ntcreate: printer open without "
1989                                 "an SMB request!\n"));
1990                         return NT_STATUS_INTERNAL_ERROR;
1991                 }
1992
1993                 return print_spool_open(fsp, smb_fname->base_name,
1994                                         req->vuid);
1995         }
1996
1997         if (!parent_dirname(talloc_tos(), smb_fname->base_name, &parent_dir,
1998                             NULL)) {
1999                 return NT_STATUS_NO_MEMORY;
2000         }
2001
2002         if (new_dos_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2003                 posix_open = True;
2004                 unx_mode = (mode_t)(new_dos_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2005                 new_dos_attributes = 0;
2006         } else {
2007                 /* Windows allows a new file to be created and
2008                    silently removes a FILE_ATTRIBUTE_DIRECTORY
2009                    sent by the client. Do the same. */
2010
2011                 new_dos_attributes &= ~FILE_ATTRIBUTE_DIRECTORY;
2012
2013                 /* We add FILE_ATTRIBUTE_ARCHIVE to this as this mode is only used if the file is
2014                  * created new. */
2015                 unx_mode = unix_mode(conn, new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2016                                      smb_fname, parent_dir);
2017         }
2018
2019         DEBUG(10, ("open_file_ntcreate: fname=%s, dos_attrs=0x%x "
2020                    "access_mask=0x%x share_access=0x%x "
2021                    "create_disposition = 0x%x create_options=0x%x "
2022                    "unix mode=0%o oplock_request=%d private_flags = 0x%x\n",
2023                    smb_fname_str_dbg(smb_fname), new_dos_attributes,
2024                    access_mask, share_access, create_disposition,
2025                    create_options, (unsigned int)unx_mode, oplock_request,
2026                    (unsigned int)private_flags));
2027
2028         if ((req == NULL) && ((oplock_request & INTERNAL_OPEN_ONLY) == 0)) {
2029                 DEBUG(0, ("No smb request but not an internal only open!\n"));
2030                 return NT_STATUS_INTERNAL_ERROR;
2031         }
2032
2033         /*
2034          * Only non-internal opens can be deferred at all
2035          */
2036
2037         if (req) {
2038                 void *ptr;
2039                 if (get_deferred_open_message_state(req,
2040                                 &request_time,
2041                                 &ptr)) {
2042                         /* Remember the absolute time of the original
2043                            request with this mid. We'll use it later to
2044                            see if this has timed out. */
2045
2046                         /* If it was an async create retry, the file
2047                            didn't exist. */
2048
2049                         if (is_deferred_open_async(ptr)) {
2050                                 SET_STAT_INVALID(smb_fname->st);
2051                                 file_existed = false;
2052                         } else {
2053                                 struct deferred_open_record *state = (struct deferred_open_record *)ptr;
2054                                 /* Remove the deferred open entry under lock. */
2055                                 remove_deferred_open_entry(
2056                                         state->id, req->mid,
2057                                         messaging_server_id(req->sconn->msg_ctx));
2058                         }
2059
2060                         /* Ensure we don't reprocess this message. */
2061                         remove_deferred_open_message_smb(req->sconn, req->mid);
2062
2063                         first_open_attempt = false;
2064                 }
2065         }
2066
2067         if (!posix_open) {
2068                 new_dos_attributes &= SAMBA_ATTRIBUTES_MASK;
2069                 if (file_existed) {
2070                         existing_dos_attributes = dos_mode(conn, smb_fname);
2071                 }
2072         }
2073
2074         /* ignore any oplock requests if oplocks are disabled */
2075         if (!lp_oplocks(SNUM(conn)) ||
2076             IS_VETO_OPLOCK_PATH(conn, smb_fname->base_name)) {
2077                 /* Mask off everything except the private Samba bits. */
2078                 oplock_request &= SAMBA_PRIVATE_OPLOCK_MASK;
2079         }
2080
2081         /* this is for OS/2 long file names - say we don't support them */
2082         if (!lp_posix_pathnames() && strstr(smb_fname->base_name,".+,;=[].")) {
2083                 /* OS/2 Workplace shell fix may be main code stream in a later
2084                  * release. */
2085                 DEBUG(5,("open_file_ntcreate: OS/2 long filenames are not "
2086                          "supported.\n"));
2087                 if (use_nt_status()) {
2088                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2089                 }
2090                 return NT_STATUS_DOS(ERRDOS, ERRcannotopen);
2091         }
2092
2093         switch( create_disposition ) {
2094                 case FILE_OPEN:
2095                         /* If file exists open. If file doesn't exist error. */
2096                         if (!file_existed) {
2097                                 DEBUG(5,("open_file_ntcreate: FILE_OPEN "
2098                                          "requested for file %s and file "
2099                                          "doesn't exist.\n",
2100                                          smb_fname_str_dbg(smb_fname)));
2101                                 errno = ENOENT;
2102                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2103                         }
2104                         break;
2105
2106                 case FILE_OVERWRITE:
2107                         /* If file exists overwrite. If file doesn't exist
2108                          * error. */
2109                         if (!file_existed) {
2110                                 DEBUG(5,("open_file_ntcreate: FILE_OVERWRITE "
2111                                          "requested for file %s and file "
2112                                          "doesn't exist.\n",
2113                                          smb_fname_str_dbg(smb_fname) ));
2114                                 errno = ENOENT;
2115                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2116                         }
2117                         break;
2118
2119                 case FILE_CREATE:
2120                         /* If file exists error. If file doesn't exist
2121                          * create. */
2122                         if (file_existed) {
2123                                 DEBUG(5,("open_file_ntcreate: FILE_CREATE "
2124                                          "requested for file %s and file "
2125                                          "already exists.\n",
2126                                          smb_fname_str_dbg(smb_fname)));
2127                                 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
2128                                         errno = EISDIR;
2129                                 } else {
2130                                         errno = EEXIST;
2131                                 }
2132                                 return map_nt_error_from_unix(errno);
2133                         }
2134                         break;
2135
2136                 case FILE_SUPERSEDE:
2137                 case FILE_OVERWRITE_IF:
2138                 case FILE_OPEN_IF:
2139                         break;
2140                 default:
2141                         return NT_STATUS_INVALID_PARAMETER;
2142         }
2143
2144         flags2 = disposition_to_open_flags(create_disposition);
2145
2146         /* We only care about matching attributes on file exists and
2147          * overwrite. */
2148
2149         if (!posix_open && file_existed &&
2150             ((create_disposition == FILE_OVERWRITE) ||
2151              (create_disposition == FILE_OVERWRITE_IF))) {
2152                 if (!open_match_attributes(conn, existing_dos_attributes,
2153                                            new_dos_attributes,
2154                                            smb_fname->st.st_ex_mode,
2155                                            unx_mode, &new_unx_mode)) {
2156                         DEBUG(5,("open_file_ntcreate: attributes missmatch "
2157                                  "for file %s (%x %x) (0%o, 0%o)\n",
2158                                  smb_fname_str_dbg(smb_fname),
2159                                  existing_dos_attributes,
2160                                  new_dos_attributes,
2161                                  (unsigned int)smb_fname->st.st_ex_mode,
2162                                  (unsigned int)unx_mode ));
2163                         errno = EACCES;
2164                         return NT_STATUS_ACCESS_DENIED;
2165                 }
2166         }
2167
2168         status = smbd_calculate_access_mask(conn, smb_fname,
2169                                         false,
2170                                         access_mask,
2171                                         &access_mask);
2172         if (!NT_STATUS_IS_OK(status)) {
2173                 DEBUG(10, ("open_file_ntcreate: smbd_calculate_access_mask "
2174                         "on file %s returned %s\n",
2175                         smb_fname_str_dbg(smb_fname), nt_errstr(status)));
2176                 return status;
2177         }
2178
2179         open_access_mask = access_mask;
2180
2181         if ((flags2 & O_TRUNC) || (oplock_request & FORCE_OPLOCK_BREAK_TO_NONE)) {
2182                 open_access_mask |= FILE_WRITE_DATA; /* This will cause oplock breaks. */
2183         }
2184
2185         DEBUG(10, ("open_file_ntcreate: fname=%s, after mapping "
2186                    "access_mask=0x%x\n", smb_fname_str_dbg(smb_fname),
2187                     access_mask));
2188
2189         /*
2190          * Note that we ignore the append flag as append does not
2191          * mean the same thing under DOS and Unix.
2192          */
2193
2194         flags = calculate_open_access_flags(access_mask, oplock_request,
2195                                             private_flags);
2196
2197         /*
2198          * Currently we only look at FILE_WRITE_THROUGH for create options.
2199          */
2200
2201 #if defined(O_SYNC)
2202         if ((create_options & FILE_WRITE_THROUGH) && lp_strict_sync(SNUM(conn))) {
2203                 flags2 |= O_SYNC;
2204         }
2205 #endif /* O_SYNC */
2206
2207         if (posix_open && (access_mask & FILE_APPEND_DATA)) {
2208                 flags2 |= O_APPEND;
2209         }
2210
2211         if (!posix_open && !CAN_WRITE(conn)) {
2212                 /*
2213                  * We should really return a permission denied error if either
2214                  * O_CREAT or O_TRUNC are set, but for compatibility with
2215                  * older versions of Samba we just AND them out.
2216                  */
2217                 flags2 &= ~(O_CREAT|O_TRUNC);
2218         }
2219
2220         if (first_open_attempt && lp_kernel_oplocks(SNUM(conn))) {
2221                 /*
2222                  * With kernel oplocks the open breaking an oplock
2223                  * blocks until the oplock holder has given up the
2224                  * oplock or closed the file. We prevent this by first
2225                  * trying to open the file with O_NONBLOCK (see "man
2226                  * fcntl" on Linux). For the second try, triggered by
2227                  * an oplock break response, we do not need this
2228                  * anymore.
2229                  *
2230                  * This is true under the assumption that only Samba
2231                  * requests kernel oplocks. Once someone else like
2232                  * NFSv4 starts to use that API, we will have to
2233                  * modify this by communicating with the NFSv4 server.
2234                  */
2235                 flags2 |= O_NONBLOCK;
2236         }
2237
2238         /*
2239          * Ensure we can't write on a read-only share or file.
2240          */
2241
2242         if (flags != O_RDONLY && file_existed &&
2243             (!CAN_WRITE(conn) || IS_DOS_READONLY(existing_dos_attributes))) {
2244                 DEBUG(5,("open_file_ntcreate: write access requested for "
2245                          "file %s on read only %s\n",
2246                          smb_fname_str_dbg(smb_fname),
2247                          !CAN_WRITE(conn) ? "share" : "file" ));
2248                 errno = EACCES;
2249                 return NT_STATUS_ACCESS_DENIED;
2250         }
2251
2252         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
2253         fsp->share_access = share_access;
2254         fsp->fh->private_options = private_flags;
2255         fsp->access_mask = open_access_mask; /* We change this to the
2256                                               * requested access_mask after
2257                                               * the open is done. */
2258         fsp->posix_open = posix_open;
2259
2260         /* Ensure no SAMBA_PRIVATE bits can be set. */
2261         fsp->oplock_type = (oplock_request & ~SAMBA_PRIVATE_OPLOCK_MASK);
2262
2263         if (timeval_is_zero(&request_time)) {
2264                 request_time = fsp->open_time;
2265         }
2266
2267         /*
2268          * Ensure we pay attention to default ACLs on directories if required.
2269          */
2270
2271         if ((flags2 & O_CREAT) && lp_inherit_acls(SNUM(conn)) &&
2272             (def_acl = directory_has_default_acl(conn, parent_dir))) {
2273                 unx_mode = (0777 & lp_create_mask(SNUM(conn)));
2274         }
2275
2276         DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o, "
2277                 "access_mask = 0x%x, open_access_mask = 0x%x\n",
2278                  (unsigned int)flags, (unsigned int)flags2,
2279                  (unsigned int)unx_mode, (unsigned int)access_mask,
2280                  (unsigned int)open_access_mask));
2281
2282         fsp_open = open_file(fsp, conn, req, parent_dir,
2283                              flags|flags2, unx_mode, access_mask,
2284                              open_access_mask, &new_file_created);
2285
2286         if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_NETWORK_BUSY)) {
2287                 struct deferred_open_record state;
2288
2289                 /*
2290                  * EWOULDBLOCK/EAGAIN maps to NETWORK_BUSY.
2291                  */
2292                 if (file_existed && S_ISFIFO(fsp->fsp_name->st.st_ex_mode)) {
2293                         DEBUG(10, ("FIFO busy\n"));
2294                         return NT_STATUS_NETWORK_BUSY;
2295                 }
2296                 if (req == NULL) {
2297                         DEBUG(10, ("Internal open busy\n"));
2298                         return NT_STATUS_NETWORK_BUSY;
2299                 }
2300
2301                 /*
2302                  * From here on we assume this is an oplock break triggered
2303                  */
2304
2305                 lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
2306                 if (lck == NULL) {
2307                         state.delayed_for_oplocks = false;
2308                         state.async_open = false;
2309                         state.id = fsp->file_id;
2310                         defer_open(NULL, request_time, timeval_set(0, 0),
2311                                    req, &state);
2312                         DEBUG(10, ("No share mode lock found after "
2313                                    "EWOULDBLOCK, retrying sync\n"));
2314                         return NT_STATUS_SHARING_VIOLATION;
2315                 }
2316
2317                 find_oplock_types(fsp, 0, lck, &batch_entry, &exclusive_entry,
2318                                   &got_level2_oplock, &got_a_none_oplock);
2319
2320                 if (delay_for_batch_oplocks(fsp, req->mid, 0, batch_entry) ||
2321                     delay_for_exclusive_oplocks(fsp, req->mid, 0,
2322                                                 exclusive_entry)) {
2323                         schedule_defer_open(lck, request_time, req);
2324                         TALLOC_FREE(lck);
2325                         DEBUG(10, ("Sent oplock break request to kernel "
2326                                    "oplock holder\n"));
2327                         return NT_STATUS_SHARING_VIOLATION;
2328                 }
2329
2330                 /*
2331                  * No oplock from Samba around. Immediately retry with
2332                  * a blocking open.
2333                  */
2334                 state.delayed_for_oplocks = false;
2335                 state.async_open = false;
2336                 state.id = lck->data->id;
2337                 defer_open(lck, request_time, timeval_set(0, 0), req, &state);
2338                 TALLOC_FREE(lck);
2339                 DEBUG(10, ("No Samba oplock around after EWOULDBLOCK. "
2340                            "Retrying sync\n"));
2341                 return NT_STATUS_SHARING_VIOLATION;
2342         }
2343
2344         if (!NT_STATUS_IS_OK(fsp_open)) {
2345                 if (NT_STATUS_EQUAL(fsp_open, NT_STATUS_RETRY)) {
2346                         schedule_async_open(request_time, req);
2347                 }
2348                 TALLOC_FREE(lck);
2349                 return fsp_open;
2350         }
2351
2352         if (file_existed && !check_same_dev_ino(&saved_stat, &smb_fname->st)) {
2353                 /*
2354                  * The file did exist, but some other (local or NFS)
2355                  * process either renamed/unlinked and re-created the
2356                  * file with different dev/ino after we walked the path,
2357                  * but before we did the open. We could retry the
2358                  * open but it's a rare enough case it's easier to
2359                  * just fail the open to prevent creating any problems
2360                  * in the open file db having the wrong dev/ino key.
2361                  */
2362                 TALLOC_FREE(lck);
2363                 fd_close(fsp);
2364                 DEBUG(1,("open_file_ntcreate: file %s - dev/ino mismatch. "
2365                         "Old (dev=0x%llu, ino =0x%llu). "
2366                         "New (dev=0x%llu, ino=0x%llu). Failing open "
2367                         " with NT_STATUS_ACCESS_DENIED.\n",
2368                          smb_fname_str_dbg(smb_fname),
2369                          (unsigned long long)saved_stat.st_ex_dev,
2370                          (unsigned long long)saved_stat.st_ex_ino,
2371                          (unsigned long long)smb_fname->st.st_ex_dev,
2372                          (unsigned long long)smb_fname->st.st_ex_ino));
2373                 return NT_STATUS_ACCESS_DENIED;
2374         }
2375
2376         old_write_time = smb_fname->st.st_ex_mtime;
2377
2378         /*
2379          * Deal with the race condition where two smbd's detect the
2380          * file doesn't exist and do the create at the same time. One
2381          * of them will win and set a share mode, the other (ie. this
2382          * one) should check if the requested share mode for this
2383          * create is allowed.
2384          */
2385
2386         /*
2387          * Now the file exists and fsp is successfully opened,
2388          * fsp->dev and fsp->inode are valid and should replace the
2389          * dev=0,inode=0 from a non existent file. Spotted by
2390          * Nadav Danieli <nadavd@exanet.com>. JRA.
2391          */
2392
2393         id = fsp->file_id;
2394
2395         lck = get_share_mode_lock(talloc_tos(), id,
2396                                   conn->connectpath,
2397                                   smb_fname, &old_write_time);
2398
2399         if (lck == NULL) {
2400                 DEBUG(0, ("open_file_ntcreate: Could not get share "
2401                           "mode lock for %s\n",
2402                           smb_fname_str_dbg(smb_fname)));
2403                 fd_close(fsp);
2404                 return NT_STATUS_SHARING_VIOLATION;
2405         }
2406
2407         /* Get the types we need to examine. */
2408         find_oplock_types(fsp,
2409                           oplock_request,
2410                           lck,
2411                           &batch_entry,
2412                           &exclusive_entry,
2413                           &got_level2_oplock,
2414                           &got_a_none_oplock);
2415
2416         /* First pass - send break only on batch oplocks. */
2417         if ((req != NULL) &&
2418             delay_for_batch_oplocks(fsp,
2419                                     req->mid,
2420                                     oplock_request,
2421                                     batch_entry)) {
2422                 schedule_defer_open(lck, request_time, req);
2423                 TALLOC_FREE(lck);
2424                 fd_close(fsp);
2425                 return NT_STATUS_SHARING_VIOLATION;
2426         }
2427
2428         status = open_mode_check(conn, lck, fsp->name_hash,
2429                                  access_mask, share_access,
2430                                  create_options, &file_existed);
2431
2432         if (NT_STATUS_IS_OK(status)) {
2433                 /* We might be going to allow this open. Check oplock
2434                  * status again. */
2435                 /* Second pass - send break for both batch or
2436                  * exclusive oplocks. */
2437                 if ((req != NULL) &&
2438                     delay_for_exclusive_oplocks(
2439                             fsp,
2440                             req->mid,
2441                             oplock_request,
2442                             exclusive_entry)) {
2443                         schedule_defer_open(lck, request_time, req);
2444                         TALLOC_FREE(lck);
2445                         fd_close(fsp);
2446                         return NT_STATUS_SHARING_VIOLATION;
2447                 }
2448         }
2449
2450         if (NT_STATUS_EQUAL(status, NT_STATUS_DELETE_PENDING)) {
2451                 /* DELETE_PENDING is not deferred for a second */
2452                 TALLOC_FREE(lck);
2453                 fd_close(fsp);
2454                 return status;
2455         }
2456
2457         if (!NT_STATUS_IS_OK(status)) {
2458                 uint32 can_access_mask;
2459                 bool can_access = True;
2460
2461                 SMB_ASSERT(NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION));
2462
2463                 /* Check if this can be done with the deny_dos and fcb
2464                  * calls. */
2465                 if (private_flags &
2466                     (NTCREATEX_OPTIONS_PRIVATE_DENY_DOS|
2467                      NTCREATEX_OPTIONS_PRIVATE_DENY_FCB)) {
2468                         if (req == NULL) {
2469                                 DEBUG(0, ("DOS open without an SMB "
2470                                           "request!\n"));
2471                                 TALLOC_FREE(lck);
2472                                 fd_close(fsp);
2473                                 return NT_STATUS_INTERNAL_ERROR;
2474                         }
2475
2476                         /* Use the client requested access mask here,
2477                          * not the one we open with. */
2478                         status = fcb_or_dos_open(req,
2479                                                  conn,
2480                                                  fsp,
2481                                                  smb_fname,
2482                                                  id,
2483                                                  req->smbpid,
2484                                                  req->vuid,
2485                                                  access_mask,
2486                                                  share_access,
2487                                                  create_options);
2488
2489                         if (NT_STATUS_IS_OK(status)) {
2490                                 TALLOC_FREE(lck);
2491                                 if (pinfo) {
2492                                         *pinfo = FILE_WAS_OPENED;
2493                                 }
2494                                 return NT_STATUS_OK;
2495                         }
2496                 }
2497
2498                 /*
2499                  * This next line is a subtlety we need for
2500                  * MS-Access. If a file open will fail due to share
2501                  * permissions and also for security (access) reasons,
2502                  * we need to return the access failed error, not the
2503                  * share error. We can't open the file due to kernel
2504                  * oplock deadlock (it's possible we failed above on
2505                  * the open_mode_check()) so use a userspace check.
2506                  */
2507
2508                 if (flags & O_RDWR) {
2509                         can_access_mask = FILE_READ_DATA|FILE_WRITE_DATA;
2510                 } else if (flags & O_WRONLY) {
2511                         can_access_mask = FILE_WRITE_DATA;
2512                 } else {
2513                         can_access_mask = FILE_READ_DATA;
2514                 }
2515
2516                 if (((can_access_mask & FILE_WRITE_DATA) &&
2517                      !CAN_WRITE(conn)) ||
2518                     !NT_STATUS_IS_OK(smbd_check_access_rights(conn,
2519                                                               smb_fname,
2520                                                               false,
2521                                                               can_access_mask))) {
2522                         can_access = False;
2523                 }
2524
2525                 /*
2526                  * If we're returning a share violation, ensure we
2527                  * cope with the braindead 1 second delay.
2528                  */
2529
2530                 if (!(oplock_request & INTERNAL_OPEN_ONLY) &&
2531                     lp_defer_sharing_violations()) {
2532                         struct timeval timeout;
2533                         struct deferred_open_record state;
2534                         int timeout_usecs;
2535
2536                         /* this is a hack to speed up torture tests
2537                            in 'make test' */
2538                         timeout_usecs = lp_parm_int(SNUM(conn),
2539                                                     "smbd","sharedelay",
2540                                                     SHARING_VIOLATION_USEC_WAIT);
2541
2542                         /* This is a relative time, added to the absolute
2543                            request_time value to get the absolute timeout time.
2544                            Note that if this is the second or greater time we enter
2545                            this codepath for this particular request mid then
2546                            request_time is left as the absolute time of the *first*
2547                            time this request mid was processed. This is what allows
2548                            the request to eventually time out. */
2549
2550                         timeout = timeval_set(0, timeout_usecs);
2551
2552                         /* Nothing actually uses state.delayed_for_oplocks
2553                            but it's handy to differentiate in debug messages
2554                            between a 30 second delay due to oplock break, and
2555                            a 1 second delay for share mode conflicts. */
2556
2557                         state.delayed_for_oplocks = False;
2558                         state.async_open = false;
2559                         state.id = id;
2560
2561                         if ((req != NULL)
2562                             && !request_timed_out(request_time,
2563                                                   timeout)) {
2564                                 defer_open(lck, request_time, timeout,
2565                                            req, &state);
2566                         }
2567                 }
2568
2569                 TALLOC_FREE(lck);
2570                 fd_close(fsp);
2571                 if (can_access) {
2572                         /*
2573                          * We have detected a sharing violation here
2574                          * so return the correct error code
2575                          */
2576                         status = NT_STATUS_SHARING_VIOLATION;
2577                 } else {
2578                         status = NT_STATUS_ACCESS_DENIED;
2579                 }
2580                 return status;
2581         }
2582
2583         grant_fsp_oplock_type(fsp,
2584                               oplock_request,
2585                               got_level2_oplock,
2586                               got_a_none_oplock);
2587
2588         /*
2589          * We have the share entry *locked*.....
2590          */
2591
2592         /* Delete streams if create_disposition requires it */
2593         if (!new_file_created && clear_ads(create_disposition) &&
2594             !is_ntfs_stream_smb_fname(smb_fname)) {
2595                 status = delete_all_streams(conn, smb_fname->base_name);
2596                 if (!NT_STATUS_IS_OK(status)) {
2597                         TALLOC_FREE(lck);
2598                         fd_close(fsp);
2599                         return status;
2600                 }
2601         }
2602
2603         /* note that we ignore failure for the following. It is
2604            basically a hack for NFS, and NFS will never set one of
2605            these only read them. Nobody but Samba can ever set a deny
2606            mode and we have already checked our more authoritative
2607            locking database for permission to set this deny mode. If
2608            the kernel refuses the operations then the kernel is wrong.
2609            note that GPFS supports it as well - jmcd */
2610
2611         if (fsp->fh->fd != -1 && lp_kernel_share_modes(SNUM(conn))) {
2612                 int ret_flock;
2613                 ret_flock = SMB_VFS_KERNEL_FLOCK(fsp, share_access, access_mask);
2614                 if(ret_flock == -1 ){
2615
2616                         TALLOC_FREE(lck);
2617                         fd_close(fsp);
2618
2619                         return NT_STATUS_SHARING_VIOLATION;
2620                 }
2621         }
2622
2623         /*
2624          * At this point onwards, we can guarantee that the share entry
2625          * is locked, whether we created the file or not, and that the
2626          * deny mode is compatible with all current opens.
2627          */
2628
2629         /*
2630          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
2631          * but we don't have to store this - just ignore it on access check.
2632          */
2633         if (conn->sconn->using_smb2) {
2634                 /*
2635                  * SMB2 doesn't return it (according to Microsoft tests).
2636                  * Test Case: TestSuite_ScenarioNo009GrantedAccessTestS0
2637                  * File created with access = 0x7 (Read, Write, Delete)
2638                  * Query Info on file returns 0x87 (Read, Write, Delete, Read Attributes)
2639                  */
2640                 fsp->access_mask = access_mask;
2641         } else {
2642                 /* But SMB1 does. */
2643                 fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
2644         }
2645
2646         if (file_existed) {
2647                 /* stat opens on existing files don't get oplocks. */
2648                 if (is_stat_open(open_access_mask)) {
2649                         fsp->oplock_type = NO_OPLOCK;
2650                 }
2651         }
2652
2653         if (new_file_created) {
2654                 info = FILE_WAS_CREATED;
2655         } else {
2656                 if (flags2 & O_TRUNC) {
2657                         info = FILE_WAS_OVERWRITTEN;
2658                 } else {
2659                         info = FILE_WAS_OPENED;
2660                 }
2661         }
2662
2663         if (pinfo) {
2664                 *pinfo = info;
2665         }
2666
2667         /*
2668          * Setup the oplock info in both the shared memory and
2669          * file structs.
2670          */
2671
2672         status = set_file_oplock(fsp, fsp->oplock_type);
2673         if (!NT_STATUS_IS_OK(status)) {
2674                 /*
2675                  * Could not get the kernel oplock or there are byte-range
2676                  * locks on the file.
2677                  */
2678                 fsp->oplock_type = NO_OPLOCK;
2679         }
2680
2681         set_share_mode(lck, fsp, get_current_uid(conn),
2682                         req ? req->mid : 0,
2683                        fsp->oplock_type);
2684
2685         /* Handle strange delete on close create semantics. */
2686         if (create_options & FILE_DELETE_ON_CLOSE) {
2687
2688                 status = can_set_delete_on_close(fsp, new_dos_attributes);
2689
2690                 if (!NT_STATUS_IS_OK(status)) {
2691                         /* Remember to delete the mode we just added. */
2692                         del_share_mode(lck, fsp);
2693                         TALLOC_FREE(lck);
2694                         fd_close(fsp);
2695                         return status;
2696                 }
2697                 /* Note that here we set the *inital* delete on close flag,
2698                    not the regular one. The magic gets handled in close. */
2699                 fsp->initial_delete_on_close = True;
2700         }
2701
2702         if (info != FILE_WAS_OPENED) {
2703                 /* Files should be initially set as archive */
2704                 if (lp_map_archive(SNUM(conn)) ||
2705                     lp_store_dos_attributes(SNUM(conn))) {
2706                         if (!posix_open) {
2707                                 if (file_set_dosmode(conn, smb_fname,
2708                                             new_dos_attributes | FILE_ATTRIBUTE_ARCHIVE,
2709                                             parent_dir, true) == 0) {
2710                                         unx_mode = smb_fname->st.st_ex_mode;
2711                                 }
2712                         }
2713                 }
2714         }
2715
2716         /* Determine sparse flag. */
2717         if (posix_open) {
2718                 /* POSIX opens are sparse by default. */
2719                 fsp->is_sparse = true;
2720         } else {
2721                 fsp->is_sparse = (file_existed &&
2722                         (existing_dos_attributes & FILE_ATTRIBUTE_SPARSE));
2723         }
2724
2725         /*
2726          * Take care of inherited ACLs on created files - if default ACL not
2727          * selected.
2728          */
2729
2730         if (!posix_open && new_file_created && !def_acl) {
2731
2732                 int saved_errno = errno; /* We might get ENOSYS in the next
2733                                           * call.. */
2734
2735                 if (SMB_VFS_FCHMOD_ACL(fsp, unx_mode) == -1 &&
2736                     errno == ENOSYS) {
2737                         errno = saved_errno; /* Ignore ENOSYS */
2738                 }
2739
2740         } else if (new_unx_mode) {
2741
2742                 int ret = -1;
2743
2744                 /* Attributes need changing. File already existed. */
2745
2746                 {
2747                         int saved_errno = errno; /* We might get ENOSYS in the
2748                                                   * next call.. */
2749                         ret = SMB_VFS_FCHMOD_ACL(fsp, new_unx_mode);
2750
2751                         if (ret == -1 && errno == ENOSYS) {
2752                                 errno = saved_errno; /* Ignore ENOSYS */
2753                         } else {
2754                                 DEBUG(5, ("open_file_ntcreate: reset "
2755                                           "attributes of file %s to 0%o\n",
2756                                           smb_fname_str_dbg(smb_fname),
2757                                           (unsigned int)new_unx_mode));
2758                                 ret = 0; /* Don't do the fchmod below. */
2759                         }
2760                 }
2761
2762                 if ((ret == -1) &&
2763                     (SMB_VFS_FCHMOD(fsp, new_unx_mode) == -1))
2764                         DEBUG(5, ("open_file_ntcreate: failed to reset "
2765                                   "attributes of file %s to 0%o\n",
2766                                   smb_fname_str_dbg(smb_fname),
2767                                   (unsigned int)new_unx_mode));
2768         }
2769
2770         /* If this is a successful open, we must remove any deferred open
2771          * records. */
2772         if (req != NULL) {
2773                 del_deferred_open_entry(lck, req->mid,
2774                                         messaging_server_id(req->sconn->msg_ctx));
2775         }
2776         TALLOC_FREE(lck);
2777
2778         return NT_STATUS_OK;
2779 }
2780
2781
2782 /****************************************************************************
2783  Open a file for for write to ensure that we can fchmod it.
2784 ****************************************************************************/
2785
2786 NTSTATUS open_file_fchmod(connection_struct *conn,
2787                           struct smb_filename *smb_fname,
2788                           files_struct **result)
2789 {
2790         if (!VALID_STAT(smb_fname->st)) {
2791                 return NT_STATUS_INVALID_PARAMETER;
2792         }
2793
2794         return SMB_VFS_CREATE_FILE(
2795                 conn,                                   /* conn */
2796                 NULL,                                   /* req */
2797                 0,                                      /* root_dir_fid */
2798                 smb_fname,                              /* fname */
2799                 FILE_WRITE_DATA,                        /* access_mask */
2800                 (FILE_SHARE_READ | FILE_SHARE_WRITE |   /* share_access */
2801                     FILE_SHARE_DELETE),
2802                 FILE_OPEN,                              /* create_disposition*/
2803                 0,                                      /* create_options */
2804                 0,                                      /* file_attributes */
2805                 INTERNAL_OPEN_ONLY,                     /* oplock_request */
2806                 0,                                      /* allocation_size */
2807                 0,                                      /* private_flags */
2808                 NULL,                                   /* sd */
2809                 NULL,                                   /* ea_list */
2810                 result,                                 /* result */
2811                 NULL);                                  /* pinfo */
2812 }
2813
2814 static NTSTATUS mkdir_internal(connection_struct *conn,
2815                                struct smb_filename *smb_dname,
2816                                uint32 file_attributes)
2817 {
2818         mode_t mode;
2819         char *parent_dir = NULL;
2820         NTSTATUS status;
2821         bool posix_open = false;
2822         bool need_re_stat = false;
2823         uint32_t access_mask = SEC_DIR_ADD_SUBDIR;
2824
2825         if (!CAN_WRITE(conn) || (access_mask & ~(conn->share_access))) {
2826                 DEBUG(5,("mkdir_internal: failing share access "
2827                          "%s\n", lp_servicename(talloc_tos(), SNUM(conn))));
2828                 return NT_STATUS_ACCESS_DENIED;
2829         }
2830
2831         if (!parent_dirname(talloc_tos(), smb_dname->base_name, &parent_dir,
2832                             NULL)) {
2833                 return NT_STATUS_NO_MEMORY;
2834         }
2835
2836         if (file_attributes & FILE_FLAG_POSIX_SEMANTICS) {
2837                 posix_open = true;
2838                 mode = (mode_t)(file_attributes & ~FILE_FLAG_POSIX_SEMANTICS);
2839         } else {
2840                 mode = unix_mode(conn, FILE_ATTRIBUTE_DIRECTORY, smb_dname, parent_dir);
2841         }
2842
2843         status = check_parent_access(conn,
2844                                         smb_dname,
2845                                         access_mask);
2846         if(!NT_STATUS_IS_OK(status)) {
2847                 DEBUG(5,("mkdir_internal: check_parent_access "
2848                         "on directory %s for path %s returned %s\n",
2849                         parent_dir,
2850                         smb_dname->base_name,
2851                         nt_errstr(status) ));
2852                 return status;
2853         }
2854
2855         if (SMB_VFS_MKDIR(conn, smb_dname->base_name, mode) != 0) {
2856                 return map_nt_error_from_unix(errno);
2857         }
2858
2859         /* Ensure we're checking for a symlink here.... */
2860         /* We don't want to get caught by a symlink racer. */
2861
2862         if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2863                 DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2864                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2865                 return map_nt_error_from_unix(errno);
2866         }
2867
2868         if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
2869                 DEBUG(0, ("Directory '%s' just created is not a directory !\n",
2870                           smb_fname_str_dbg(smb_dname)));
2871                 return NT_STATUS_NOT_A_DIRECTORY;
2872         }
2873
2874         if (lp_store_dos_attributes(SNUM(conn))) {
2875                 if (!posix_open) {
2876                         file_set_dosmode(conn, smb_dname,
2877                                          file_attributes | FILE_ATTRIBUTE_DIRECTORY,
2878                                          parent_dir, true);
2879                 }
2880         }
2881
2882         if (lp_inherit_perms(SNUM(conn))) {
2883                 inherit_access_posix_acl(conn, parent_dir,
2884                                          smb_dname->base_name, mode);
2885                 need_re_stat = true;
2886         }
2887
2888         if (!posix_open) {
2889                 /*
2890                  * Check if high bits should have been set,
2891                  * then (if bits are missing): add them.
2892                  * Consider bits automagically set by UNIX, i.e. SGID bit from parent
2893                  * dir.
2894                  */
2895                 if ((mode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) &&
2896                     (mode & ~smb_dname->st.st_ex_mode)) {
2897                         SMB_VFS_CHMOD(conn, smb_dname->base_name,
2898                                       (smb_dname->st.st_ex_mode |
2899                                           (mode & ~smb_dname->st.st_ex_mode)));
2900                         need_re_stat = true;
2901                 }
2902         }
2903
2904         /* Change the owner if required. */
2905         if (lp_inherit_owner(SNUM(conn))) {
2906                 change_dir_owner_to_parent(conn, parent_dir,
2907                                            smb_dname->base_name,
2908                                            &smb_dname->st);
2909                 need_re_stat = true;
2910         }
2911
2912         if (need_re_stat) {
2913                 if (SMB_VFS_LSTAT(conn, smb_dname) == -1) {
2914                         DEBUG(2, ("Could not stat directory '%s' just created: %s\n",
2915                           smb_fname_str_dbg(smb_dname), strerror(errno)));
2916                         return map_nt_error_from_unix(errno);
2917                 }
2918         }
2919
2920         notify_fname(conn, NOTIFY_ACTION_ADDED, FILE_NOTIFY_CHANGE_DIR_NAME,
2921                      smb_dname->base_name);
2922
2923         return NT_STATUS_OK;
2924 }
2925
2926 /****************************************************************************
2927  Open a directory from an NT SMB call.
2928 ****************************************************************************/
2929
2930 static NTSTATUS open_directory(connection_struct *conn,
2931                                struct smb_request *req,
2932                                struct smb_filename *smb_dname,
2933                                uint32 access_mask,
2934                                uint32 share_access,
2935                                uint32 create_disposition,
2936                                uint32 create_options,
2937                                uint32 file_attributes,
2938                                int *pinfo,
2939                                files_struct **result)
2940 {
2941         files_struct *fsp = NULL;
2942         bool dir_existed = VALID_STAT(smb_dname->st) ? True : False;
2943         struct share_mode_lock *lck = NULL;
2944         NTSTATUS status;
2945         struct timespec mtimespec;
2946         int info = 0;
2947
2948         if (is_ntfs_stream_smb_fname(smb_dname)) {
2949                 DEBUG(2, ("open_directory: %s is a stream name!\n",
2950                           smb_fname_str_dbg(smb_dname)));
2951                 return NT_STATUS_NOT_A_DIRECTORY;
2952         }
2953
2954         if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS)) {
2955                 /* Ensure we have a directory attribute. */
2956                 file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
2957         }
2958
2959         DEBUG(5,("open_directory: opening directory %s, access_mask = 0x%x, "
2960                  "share_access = 0x%x create_options = 0x%x, "
2961                  "create_disposition = 0x%x, file_attributes = 0x%x\n",
2962                  smb_fname_str_dbg(smb_dname),
2963                  (unsigned int)access_mask,
2964                  (unsigned int)share_access,
2965                  (unsigned int)create_options,
2966                  (unsigned int)create_disposition,
2967                  (unsigned int)file_attributes));
2968
2969         status = smbd_calculate_access_mask(conn, smb_dname, false,
2970                                             access_mask, &access_mask);
2971         if (!NT_STATUS_IS_OK(status)) {
2972                 DEBUG(10, ("open_directory: smbd_calculate_access_mask "
2973                         "on file %s returned %s\n",
2974                         smb_fname_str_dbg(smb_dname),
2975                         nt_errstr(status)));
2976                 return status;
2977         }
2978
2979         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
2980                         !security_token_has_privilege(get_current_nttok(conn),
2981                                         SEC_PRIV_SECURITY)) {
2982                 DEBUG(10, ("open_directory: open on %s "
2983                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
2984                         smb_fname_str_dbg(smb_dname)));
2985                 return NT_STATUS_PRIVILEGE_NOT_HELD;
2986         }
2987
2988         switch( create_disposition ) {
2989                 case FILE_OPEN:
2990
2991                         if (!dir_existed) {
2992                                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
2993                         }
2994
2995                         info = FILE_WAS_OPENED;
2996                         break;
2997
2998                 case FILE_CREATE:
2999
3000                         /* If directory exists error. If directory doesn't
3001                          * exist create. */
3002
3003                         if (dir_existed) {
3004                                 status = NT_STATUS_OBJECT_NAME_COLLISION;
3005                                 DEBUG(2, ("open_directory: unable to create "
3006                                           "%s. Error was %s\n",
3007                                           smb_fname_str_dbg(smb_dname),
3008                                           nt_errstr(status)));
3009                                 return status;
3010                         }
3011
3012                         status = mkdir_internal(conn, smb_dname,
3013                                                 file_attributes);
3014
3015                         if (!NT_STATUS_IS_OK(status)) {
3016                                 DEBUG(2, ("open_directory: unable to create "
3017                                           "%s. Error was %s\n",
3018                                           smb_fname_str_dbg(smb_dname),
3019                                           nt_errstr(status)));
3020                                 return status;
3021                         }
3022
3023                         info = FILE_WAS_CREATED;
3024                         break;
3025
3026                 case FILE_OPEN_IF:
3027                         /*
3028                          * If directory exists open. If directory doesn't
3029                          * exist create.
3030                          */
3031
3032                         if (dir_existed) {
3033                                 status = NT_STATUS_OK;
3034                                 info = FILE_WAS_OPENED;
3035                         } else {
3036                                 status = mkdir_internal(conn, smb_dname,
3037                                                 file_attributes);
3038
3039                                 if (NT_STATUS_IS_OK(status)) {
3040                                         info = FILE_WAS_CREATED;
3041                                 } else {
3042                                         /* Cope with create race. */
3043                                         if (!NT_STATUS_EQUAL(status,
3044                                                         NT_STATUS_OBJECT_NAME_COLLISION)) {
3045                                                 DEBUG(2, ("open_directory: unable to create "
3046                                                         "%s. Error was %s\n",
3047                                                         smb_fname_str_dbg(smb_dname),
3048                                                         nt_errstr(status)));
3049                                                 return status;
3050                                         }
3051                                         info = FILE_WAS_OPENED;
3052                                 }
3053                         }
3054
3055                         break;
3056
3057                 case FILE_SUPERSEDE:
3058                 case FILE_OVERWRITE:
3059                 case FILE_OVERWRITE_IF:
3060                 default:
3061                         DEBUG(5,("open_directory: invalid create_disposition "
3062                                  "0x%x for directory %s\n",
3063                                  (unsigned int)create_disposition,
3064                                  smb_fname_str_dbg(smb_dname)));
3065                         return NT_STATUS_INVALID_PARAMETER;
3066         }
3067
3068         if(!S_ISDIR(smb_dname->st.st_ex_mode)) {
3069                 DEBUG(5,("open_directory: %s is not a directory !\n",
3070                          smb_fname_str_dbg(smb_dname)));
3071                 return NT_STATUS_NOT_A_DIRECTORY;
3072         }
3073
3074         if (info == FILE_WAS_OPENED) {
3075                 status = smbd_check_access_rights(conn,
3076                                                 smb_dname,
3077                                                 false,
3078                                                 access_mask);
3079                 if (!NT_STATUS_IS_OK(status)) {
3080                         DEBUG(10, ("open_directory: smbd_check_access_rights on "
3081                                 "file %s failed with %s\n",
3082                                 smb_fname_str_dbg(smb_dname),
3083                                 nt_errstr(status)));
3084                         return status;
3085                 }
3086         }
3087
3088         status = file_new(req, conn, &fsp);
3089         if(!NT_STATUS_IS_OK(status)) {
3090                 return status;
3091         }
3092
3093         /*
3094          * Setup the files_struct for it.
3095          */
3096
3097         fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_dname->st);
3098         fsp->vuid = req ? req->vuid : UID_FIELD_INVALID;
3099         fsp->file_pid = req ? req->smbpid : 0;
3100         fsp->can_lock = False;
3101         fsp->can_read = False;
3102         fsp->can_write = False;
3103
3104         fsp->share_access = share_access;
3105         fsp->fh->private_options = 0;
3106         /*
3107          * According to Samba4, SEC_FILE_READ_ATTRIBUTE is always granted,
3108          */
3109         fsp->access_mask = access_mask | FILE_READ_ATTRIBUTES;
3110         fsp->print_file = NULL;
3111         fsp->modified = False;
3112         fsp->oplock_type = NO_OPLOCK;
3113         fsp->sent_oplock_break = NO_BREAK_SENT;
3114         fsp->is_directory = True;
3115         fsp->posix_open = (file_attributes & FILE_FLAG_POSIX_SEMANTICS) ? True : False;
3116         status = fsp_set_smb_fname(fsp, smb_dname);
3117         if (!NT_STATUS_IS_OK(status)) {
3118                 file_free(req, fsp);
3119                 return status;
3120         }
3121
3122         mtimespec = smb_dname->st.st_ex_mtime;
3123
3124 #ifdef O_DIRECTORY
3125         status = fd_open(conn, fsp, O_RDONLY|O_DIRECTORY, 0);
3126 #else
3127         /* POSIX allows us to open a directory with O_RDONLY. */
3128         status = fd_open(conn, fsp, O_RDONLY, 0);
3129 #endif
3130         if (!NT_STATUS_IS_OK(status)) {
3131                 DEBUG(5, ("open_directory: Could not open fd for "
3132                         "%s (%s)\n",
3133                         smb_fname_str_dbg(smb_dname),
3134                         nt_errstr(status)));
3135                 file_free(req, fsp);
3136                 return status;
3137         }
3138
3139         status = vfs_stat_fsp(fsp);
3140         if (!NT_STATUS_IS_OK(status)) {
3141                 fd_close(fsp);
3142                 file_free(req, fsp);
3143                 return status;
3144         }
3145
3146         /* Ensure there was no race condition. */
3147         if (!check_same_stat(&smb_dname->st, &fsp->fsp_name->st)) {
3148                 DEBUG(5,("open_directory: stat struct differs for "
3149                         "directory %s.\n",
3150                         smb_fname_str_dbg(smb_dname)));
3151                 fd_close(fsp);
3152                 file_free(req, fsp);
3153                 return NT_STATUS_ACCESS_DENIED;
3154         }
3155
3156         lck = get_share_mode_lock(talloc_tos(), fsp->file_id,
3157                                   conn->connectpath, smb_dname,
3158                                   &mtimespec);
3159
3160         if (lck == NULL) {
3161                 DEBUG(0, ("open_directory: Could not get share mode lock for "
3162                           "%s\n", smb_fname_str_dbg(smb_dname)));
3163                 fd_close(fsp);
3164                 file_free(req, fsp);
3165                 return NT_STATUS_SHARING_VIOLATION;
3166         }
3167
3168         status = open_mode_check(conn, lck, fsp->name_hash,
3169                                 access_mask, share_access,
3170                                  create_options, &dir_existed);
3171
3172         if (!NT_STATUS_IS_OK(status)) {
3173                 TALLOC_FREE(lck);
3174                 fd_close(fsp);
3175                 file_free(req, fsp);
3176                 return status;
3177         }
3178
3179         set_share_mode(lck, fsp, get_current_uid(conn),
3180                         req ? req->mid : 0, NO_OPLOCK);
3181
3182         /* For directories the delete on close bit at open time seems
3183            always to be honored on close... See test 19 in Samba4 BASE-DELETE. */
3184         if (create_options & FILE_DELETE_ON_CLOSE) {
3185                 status = can_set_delete_on_close(fsp, 0);
3186                 if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_DIRECTORY_NOT_EMPTY)) {
3187                         TALLOC_FREE(lck);
3188                         fd_close(fsp);
3189                         file_free(req, fsp);
3190                         return status;
3191                 }
3192
3193                 if (NT_STATUS_IS_OK(status)) {
3194                         /* Note that here we set the *inital* delete on close flag,
3195                            not the regular one. The magic gets handled in close. */
3196                         fsp->initial_delete_on_close = True;
3197                 }
3198         }
3199
3200         TALLOC_FREE(lck);
3201
3202         if (pinfo) {
3203                 *pinfo = info;
3204         }
3205
3206         *result = fsp;
3207         return NT_STATUS_OK;
3208 }
3209
3210 NTSTATUS create_directory(connection_struct *conn, struct smb_request *req,
3211                           struct smb_filename *smb_dname)
3212 {
3213         NTSTATUS status;
3214         files_struct *fsp;
3215
3216         status = SMB_VFS_CREATE_FILE(
3217                 conn,                                   /* conn */
3218                 req,                                    /* req */
3219                 0,                                      /* root_dir_fid */
3220                 smb_dname,                              /* fname */
3221                 FILE_READ_ATTRIBUTES,                   /* access_mask */
3222                 FILE_SHARE_NONE,                        /* share_access */
3223                 FILE_CREATE,                            /* create_disposition*/
3224                 FILE_DIRECTORY_FILE,                    /* create_options */
3225                 FILE_ATTRIBUTE_DIRECTORY,               /* file_attributes */
3226                 0,                                      /* oplock_request */
3227                 0,                                      /* allocation_size */
3228                 0,                                      /* private_flags */
3229                 NULL,                                   /* sd */
3230                 NULL,                                   /* ea_list */
3231                 &fsp,                                   /* result */
3232                 NULL);                                  /* pinfo */
3233
3234         if (NT_STATUS_IS_OK(status)) {
3235                 close_file(req, fsp, NORMAL_CLOSE);
3236         }
3237
3238         return status;
3239 }
3240
3241 /****************************************************************************
3242  Receive notification that one of our open files has been renamed by another
3243  smbd process.
3244 ****************************************************************************/
3245
3246 void msg_file_was_renamed(struct messaging_context *msg,
3247                           void *private_data,
3248                           uint32_t msg_type,
3249                           struct server_id server_id,
3250                           DATA_BLOB *data)
3251 {
3252         files_struct *fsp;
3253         char *frm = (char *)data->data;
3254         struct file_id id;
3255         const char *sharepath;
3256         const char *base_name;
3257         const char *stream_name;
3258         struct smb_filename *smb_fname = NULL;
3259         size_t sp_len, bn_len;
3260         NTSTATUS status;
3261         struct smbd_server_connection *sconn =
3262                 talloc_get_type_abort(private_data,
3263                 struct smbd_server_connection);
3264
3265         if (data->data == NULL
3266             || data->length < MSG_FILE_RENAMED_MIN_SIZE + 2) {
3267                 DEBUG(0, ("msg_file_was_renamed: Got invalid msg len %d\n",
3268                           (int)data->length));
3269                 return;
3270         }
3271
3272         /* Unpack the message. */
3273         pull_file_id_24(frm, &id);
3274         sharepath = &frm[24];
3275         sp_len = strlen(sharepath);
3276         base_name = sharepath + sp_len + 1;
3277         bn_len = strlen(base_name);
3278         stream_name = sharepath + sp_len + 1 + bn_len + 1;
3279
3280         /* stream_name must always be NULL if there is no stream. */
3281         if (stream_name[0] == '\0') {
3282                 stream_name = NULL;
3283         }
3284
3285         smb_fname = synthetic_smb_fname(talloc_tos(), base_name,
3286                                         stream_name, NULL);
3287         if (smb_fname == NULL) {
3288                 return;
3289         }
3290
3291         DEBUG(10,("msg_file_was_renamed: Got rename message for sharepath %s, new name %s, "
3292                 "file_id %s\n",
3293                 sharepath, smb_fname_str_dbg(smb_fname),
3294                 file_id_string_tos(&id)));
3295
3296         for(fsp = file_find_di_first(sconn, id); fsp;
3297             fsp = file_find_di_next(fsp)) {
3298                 if (memcmp(fsp->conn->connectpath, sharepath, sp_len) == 0) {
3299
3300                         DEBUG(10,("msg_file_was_renamed: renaming file %s from %s -> %s\n",
3301                                 fsp_fnum_dbg(fsp), fsp_str_dbg(fsp),
3302                                 smb_fname_str_dbg(smb_fname)));
3303                         status = fsp_set_smb_fname(fsp, smb_fname);
3304                         if (!NT_STATUS_IS_OK(status)) {
3305                                 goto out;
3306                         }
3307                 } else {
3308                         /* TODO. JRA. */
3309                         /* Now we have the complete path we can work out if this is
3310                            actually within this share and adjust newname accordingly. */
3311                         DEBUG(10,("msg_file_was_renamed: share mismatch (sharepath %s "
3312                                 "not sharepath %s) "
3313                                 "%s from %s -> %s\n",
3314                                 fsp->conn->connectpath,
3315                                 sharepath,
3316                                 fsp_fnum_dbg(fsp),
3317                                 fsp_str_dbg(fsp),
3318                                 smb_fname_str_dbg(smb_fname)));
3319                 }
3320         }
3321  out:
3322         TALLOC_FREE(smb_fname);
3323         return;
3324 }
3325
3326 /*
3327  * If a main file is opened for delete, all streams need to be checked for
3328  * !FILE_SHARE_DELETE. Do this by opening with DELETE_ACCESS.
3329  * If that works, delete them all by setting the delete on close and close.
3330  */
3331
3332 NTSTATUS open_streams_for_delete(connection_struct *conn,
3333                                         const char *fname)
3334 {
3335         struct stream_struct *stream_info = NULL;
3336         files_struct **streams = NULL;
3337         int i;
3338         unsigned int num_streams = 0;
3339         TALLOC_CTX *frame = talloc_stackframe();
3340         NTSTATUS status;
3341
3342         status = vfs_streaminfo(conn, NULL, fname, talloc_tos(),
3343                                 &num_streams, &stream_info);
3344
3345         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)
3346             || NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
3347                 DEBUG(10, ("no streams around\n"));
3348                 TALLOC_FREE(frame);
3349                 return NT_STATUS_OK;
3350         }
3351
3352         if (!NT_STATUS_IS_OK(status)) {
3353                 DEBUG(10, ("vfs_streaminfo failed: %s\n",
3354                            nt_errstr(status)));
3355                 goto fail;
3356         }
3357
3358         DEBUG(10, ("open_streams_for_delete found %d streams\n",
3359                    num_streams));
3360
3361         if (num_streams == 0) {
3362                 TALLOC_FREE(frame);
3363                 return NT_STATUS_OK;
3364         }
3365
3366         streams = talloc_array(talloc_tos(), files_struct *, num_streams);
3367         if (streams == NULL) {
3368                 DEBUG(0, ("talloc failed\n"));
3369                 status = NT_STATUS_NO_MEMORY;
3370                 goto fail;
3371         }
3372
3373         for (i=0; i<num_streams; i++) {
3374                 struct smb_filename *smb_fname;
3375
3376                 if (strequal(stream_info[i].name, "::$DATA")) {
3377                         streams[i] = NULL;
3378                         continue;
3379                 }
3380
3381                 smb_fname = synthetic_smb_fname(
3382                         talloc_tos(), fname, stream_info[i].name, NULL);
3383                 if (smb_fname == NULL) {
3384                         status = NT_STATUS_NO_MEMORY;
3385                         goto fail;
3386                 }
3387
3388                 if (SMB_VFS_STAT(conn, smb_fname) == -1) {
3389                         DEBUG(10, ("Unable to stat stream: %s\n",
3390                                    smb_fname_str_dbg(smb_fname)));
3391                 }
3392
3393                 status = SMB_VFS_CREATE_FILE(
3394                          conn,                  /* conn */
3395                          NULL,                  /* req */
3396                          0,                     /* root_dir_fid */
3397                          smb_fname,             /* fname */
3398                          DELETE_ACCESS,         /* access_mask */
3399                          (FILE_SHARE_READ |     /* share_access */
3400                              FILE_SHARE_WRITE | FILE_SHARE_DELETE),
3401                          FILE_OPEN,             /* create_disposition*/
3402                          0,                     /* create_options */
3403                          FILE_ATTRIBUTE_NORMAL, /* file_attributes */
3404                          0,                     /* oplock_request */
3405                          0,                     /* allocation_size */
3406                          NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE, /* private_flags */
3407                          NULL,                  /* sd */
3408                          NULL,                  /* ea_list */
3409                          &streams[i],           /* result */
3410                          NULL);                 /* pinfo */
3411
3412                 if (!NT_STATUS_IS_OK(status)) {
3413                         DEBUG(10, ("Could not open stream %s: %s\n",
3414                                    smb_fname_str_dbg(smb_fname),
3415                                    nt_errstr(status)));
3416
3417                         TALLOC_FREE(smb_fname);
3418                         break;
3419                 }
3420                 TALLOC_FREE(smb_fname);
3421         }
3422
3423         /*
3424          * don't touch the variable "status" beyond this point :-)
3425          */
3426
3427         for (i -= 1 ; i >= 0; i--) {
3428                 if (streams[i] == NULL) {
3429                         continue;
3430                 }
3431
3432                 DEBUG(10, ("Closing stream # %d, %s\n", i,
3433                            fsp_str_dbg(streams[i])));
3434                 close_file(NULL, streams[i], NORMAL_CLOSE);
3435         }
3436
3437  fail:
3438         TALLOC_FREE(frame);
3439         return status;
3440 }
3441
3442 /*********************************************************************
3443  Create a default ACL by inheriting from the parent. If no inheritance
3444  from the parent available, don't set anything. This will leave the actual
3445  permissions the new file or directory already got from the filesystem
3446  as the NT ACL when read.
3447 *********************************************************************/
3448
3449 static NTSTATUS inherit_new_acl(files_struct *fsp)
3450 {
3451         TALLOC_CTX *frame = talloc_stackframe();
3452         char *parent_name = NULL;
3453         struct security_descriptor *parent_desc = NULL;
3454         NTSTATUS status = NT_STATUS_OK;
3455         struct security_descriptor *psd = NULL;
3456         const struct dom_sid *owner_sid = NULL;
3457         const struct dom_sid *group_sid = NULL;
3458         uint32_t security_info_sent = (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL);
3459         struct security_token *token = fsp->conn->session_info->security_token;
3460         bool inherit_owner = lp_inherit_owner(SNUM(fsp->conn));
3461         bool inheritable_components = false;
3462         bool try_builtin_administrators = false;
3463         const struct dom_sid *BA_U_sid = NULL;
3464         const struct dom_sid *BA_G_sid = NULL;
3465         bool try_system = false;
3466         const struct dom_sid *SY_U_sid = NULL;
3467         const struct dom_sid *SY_G_sid = NULL;
3468         size_t size = 0;
3469
3470         if (!parent_dirname(frame, fsp->fsp_name->base_name, &parent_name, NULL)) {
3471                 TALLOC_FREE(frame);
3472                 return NT_STATUS_NO_MEMORY;
3473         }
3474
3475         status = SMB_VFS_GET_NT_ACL(fsp->conn,
3476                                     parent_name,
3477                                     (SECINFO_OWNER | SECINFO_GROUP | SECINFO_DACL),
3478                                     frame,
3479                                     &parent_desc);
3480         if (!NT_STATUS_IS_OK(status)) {
3481                 TALLOC_FREE(frame);
3482                 return status;
3483         }
3484
3485         inheritable_components = sd_has_inheritable_components(parent_desc,
3486                                         fsp->is_directory);
3487
3488         if (!inheritable_components && !inherit_owner) {
3489                 TALLOC_FREE(frame);
3490                 /* Nothing to inherit and not setting owner. */
3491                 return NT_STATUS_OK;
3492         }
3493
3494         /* Create an inherited descriptor from the parent. */
3495
3496         if (DEBUGLEVEL >= 10) {
3497                 DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
3498                         fsp_str_dbg(fsp) ));
3499                 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
3500         }
3501
3502         /* Inherit from parent descriptor if "inherit owner" set. */
3503         if (inherit_owner) {
3504                 owner_sid = parent_desc->owner_sid;
3505                 group_sid = parent_desc->group_sid;
3506         }
3507
3508         if (owner_sid == NULL) {
3509                 if (security_token_has_builtin_administrators(token)) {
3510                         try_builtin_administrators = true;
3511                 } else if (security_token_is_system(token)) {
3512                         try_builtin_administrators = true;
3513                         try_system = true;
3514                 }
3515         }
3516
3517         if (group_sid == NULL &&
3518             token->num_sids == PRIMARY_GROUP_SID_INDEX)
3519         {
3520                 if (security_token_is_system(token)) {
3521                         try_builtin_administrators = true;
3522                         try_system = true;
3523                 }
3524         }
3525
3526         if (try_builtin_administrators) {
3527                 struct unixid ids;
3528                 bool ok;
3529
3530                 ZERO_STRUCT(ids);
3531                 ok = sids_to_unixids(&global_sid_Builtin_Administrators, 1, &ids);
3532                 if (ok) {
3533                         switch (ids.type) {
3534                         case ID_TYPE_BOTH:
3535                                 BA_U_sid = &global_sid_Builtin_Administrators;
3536                                 BA_G_sid = &global_sid_Builtin_Administrators;
3537                                 break;
3538                         case ID_TYPE_UID:
3539                                 BA_U_sid = &global_sid_Builtin_Administrators;
3540                                 break;
3541                         case ID_TYPE_GID:
3542                                 BA_G_sid = &global_sid_Builtin_Administrators;
3543                                 break;
3544                         default:
3545                                 break;
3546                         }
3547                 }
3548         }
3549
3550         if (try_system) {
3551                 struct unixid ids;
3552                 bool ok;
3553
3554                 ZERO_STRUCT(ids);
3555                 ok = sids_to_unixids(&global_sid_System, 1, &ids);
3556                 if (ok) {
3557                         switch (ids.type) {
3558                         case ID_TYPE_BOTH:
3559                                 SY_U_sid = &global_sid_System;
3560                                 SY_G_sid = &global_sid_System;
3561                                 break;
3562                         case ID_TYPE_UID:
3563                                 SY_U_sid = &global_sid_System;
3564                                 break;
3565                         case ID_TYPE_GID:
3566                                 SY_G_sid = &global_sid_System;
3567                                 break;
3568                         default:
3569                                 break;
3570                         }
3571                 }
3572         }
3573
3574         if (owner_sid == NULL) {
3575                 owner_sid = BA_U_sid;
3576         }
3577
3578         if (owner_sid == NULL) {
3579                 owner_sid = SY_U_sid;
3580         }
3581
3582         if (group_sid == NULL) {
3583                 group_sid = SY_G_sid;
3584         }
3585
3586         if (try_system && group_sid == NULL) {
3587                 group_sid = BA_G_sid;
3588         }
3589
3590         if (owner_sid == NULL) {
3591                 owner_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3592         }
3593         if (group_sid == NULL) {
3594                 if (token->num_sids == PRIMARY_GROUP_SID_INDEX) {
3595                         group_sid = &token->sids[PRIMARY_USER_SID_INDEX];
3596                 } else {
3597                         group_sid = &token->sids[PRIMARY_GROUP_SID_INDEX];
3598                 }
3599         }
3600
3601         status = se_create_child_secdesc(frame,
3602                         &psd,
3603                         &size,
3604                         parent_desc,
3605                         owner_sid,
3606                         group_sid,
3607                         fsp->is_directory);
3608         if (!NT_STATUS_IS_OK(status)) {
3609                 TALLOC_FREE(frame);
3610                 return status;
3611         }
3612
3613         /* If inheritable_components == false,
3614            se_create_child_secdesc()
3615            creates a security desriptor with a NULL dacl
3616            entry, but with SEC_DESC_DACL_PRESENT. We need
3617            to remove that flag. */
3618
3619         if (!inheritable_components) {
3620                 security_info_sent &= ~SECINFO_DACL;
3621                 psd->type &= ~SEC_DESC_DACL_PRESENT;
3622         }
3623
3624         if (DEBUGLEVEL >= 10) {
3625                 DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
3626                         fsp_str_dbg(fsp) ));
3627                 NDR_PRINT_DEBUG(security_descriptor, psd);
3628         }
3629
3630         if (inherit_owner) {
3631                 /* We need to be root to force this. */
3632                 become_root();
3633         }
3634         status = SMB_VFS_FSET_NT_ACL(fsp,
3635                         security_info_sent,
3636                         psd);
3637         if (inherit_owner) {
3638                 unbecome_root();
3639         }
3640         TALLOC_FREE(frame);
3641         return status;
3642 }
3643
3644 /*
3645  * Wrapper around open_file_ntcreate and open_directory
3646  */
3647
3648 static NTSTATUS create_file_unixpath(connection_struct *conn,
3649                                      struct smb_request *req,
3650                                      struct smb_filename *smb_fname,
3651                                      uint32_t access_mask,
3652                                      uint32_t share_access,
3653                                      uint32_t create_disposition,
3654                                      uint32_t create_options,
3655                                      uint32_t file_attributes,
3656                                      uint32_t oplock_request,
3657                                      uint64_t allocation_size,
3658                                      uint32_t private_flags,
3659                                      struct security_descriptor *sd,
3660                                      struct ea_list *ea_list,
3661
3662                                      files_struct **result,
3663                                      int *pinfo)
3664 {
3665         int info = FILE_WAS_OPENED;
3666         files_struct *base_fsp = NULL;
3667         files_struct *fsp = NULL;
3668         NTSTATUS status;
3669
3670         DEBUG(10,("create_file_unixpath: access_mask = 0x%x "
3671                   "file_attributes = 0x%x, share_access = 0x%x, "
3672                   "create_disposition = 0x%x create_options = 0x%x "
3673                   "oplock_request = 0x%x private_flags = 0x%x "
3674                   "ea_list = 0x%p, sd = 0x%p, "
3675                   "fname = %s\n",
3676                   (unsigned int)access_mask,
3677                   (unsigned int)file_attributes,
3678                   (unsigned int)share_access,
3679                   (unsigned int)create_disposition,
3680                   (unsigned int)create_options,
3681                   (unsigned int)oplock_request,
3682                   (unsigned int)private_flags,
3683                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
3684
3685         if (create_options & FILE_OPEN_BY_FILE_ID) {
3686                 status = NT_STATUS_NOT_SUPPORTED;
3687                 goto fail;
3688         }
3689
3690         if (create_options & NTCREATEX_OPTIONS_INVALID_PARAM_MASK) {
3691                 status = NT_STATUS_INVALID_PARAMETER;
3692                 goto fail;
3693         }
3694
3695         if (req == NULL) {
3696                 oplock_request |= INTERNAL_OPEN_ONLY;
3697         }
3698
3699         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3700             && (access_mask & DELETE_ACCESS)
3701             && !is_ntfs_stream_smb_fname(smb_fname)) {
3702                 /*
3703                  * We can't open a file with DELETE access if any of the
3704                  * streams is open without FILE_SHARE_DELETE
3705                  */
3706                 status = open_streams_for_delete(conn, smb_fname->base_name);
3707
3708                 if (!NT_STATUS_IS_OK(status)) {
3709                         goto fail;
3710                 }
3711         }
3712
3713         if ((access_mask & SEC_FLAG_SYSTEM_SECURITY) &&
3714                         !security_token_has_privilege(get_current_nttok(conn),
3715                                         SEC_PRIV_SECURITY)) {
3716                 DEBUG(10, ("create_file_unixpath: open on %s "
3717                         "failed - SEC_FLAG_SYSTEM_SECURITY denied.\n",
3718                         smb_fname_str_dbg(smb_fname)));
3719                 status = NT_STATUS_PRIVILEGE_NOT_HELD;
3720                 goto fail;
3721         }
3722
3723         if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
3724             && is_ntfs_stream_smb_fname(smb_fname)
3725             && (!(private_flags & NTCREATEX_OPTIONS_PRIVATE_STREAM_DELETE))) {
3726                 uint32 base_create_disposition;
3727                 struct smb_filename *smb_fname_base = NULL;
3728
3729                 if (create_options & FILE_DIRECTORY_FILE) {
3730                         status = NT_STATUS_NOT_A_DIRECTORY;
3731                         goto fail;
3732                 }
3733
3734                 switch (create_disposition) {
3735                 case FILE_OPEN:
3736                         base_create_disposition = FILE_OPEN;
3737                         break;
3738                 default:
3739                         base_create_disposition = FILE_OPEN_IF;
3740                         break;
3741                 }
3742
3743                 /* Create an smb_filename with stream_name == NULL. */
3744                 status = create_synthetic_smb_fname(talloc_tos(),
3745                                                     smb_fname->base_name,
3746                                                     NULL, NULL,
3747                                                     &smb_fname_base);
3748                 if (!NT_STATUS_IS_OK(status)) {
3749                         goto fail;
3750                 }
3751
3752                 if (SMB_VFS_STAT(conn, smb_fname_base) == -1) {
3753                         DEBUG(10, ("Unable to stat stream: %s\n",
3754                                    smb_fname_str_dbg(smb_fname_base)));
3755                 }
3756
3757                 /* Open the base file. */
3758                 status = create_file_unixpath(conn, NULL, smb_fname_base, 0,
3759                                               FILE_SHARE_READ
3760                                               | FILE_SHARE_WRITE
3761                                               | FILE_SHARE_DELETE,
3762                                               base_create_disposition,
3763                                               0, 0, 0, 0, 0, NULL, NULL,
3764                                               &base_fsp, NULL);
3765                 TALLOC_FREE(smb_fname_base);
3766
3767                 if (!NT_STATUS_IS_OK(status)) {
3768                         DEBUG(10, ("create_file_unixpath for base %s failed: "
3769                                    "%s\n", smb_fname->base_name,
3770                                    nt_errstr(status)));
3771                         goto fail;
3772                 }
3773                 /* we don't need to low level fd */
3774                 fd_close(base_fsp);
3775         }
3776
3777         /*
3778          * If it's a request for a directory open, deal with it separately.
3779          */
3780
3781         if (create_options & FILE_DIRECTORY_FILE) {
3782
3783                 if (create_options & FILE_NON_DIRECTORY_FILE) {
3784                         status = NT_STATUS_INVALID_PARAMETER;
3785                         goto fail;
3786                 }
3787
3788                 /* Can't open a temp directory. IFS kit test. */
3789                 if (!(file_attributes & FILE_FLAG_POSIX_SEMANTICS) &&
3790                      (file_attributes & FILE_ATTRIBUTE_TEMPORARY)) {
3791                         status = NT_STATUS_INVALID_PARAMETER;
3792                         goto fail;
3793                 }
3794
3795                 /*
3796                  * We will get a create directory here if the Win32
3797                  * app specified a security descriptor in the
3798                  * CreateDirectory() call.
3799                  */
3800
3801                 oplock_request = 0;
3802                 status = open_directory(
3803                         conn, req, smb_fname, access_mask, share_access,
3804                         create_disposition, create_options, file_attributes,
3805                         &info, &fsp);
3806         } else {
3807
3808                 /*
3809                  * Ordinary file case.
3810                  */
3811
3812                 status = file_new(req, conn, &fsp);
3813                 if(!NT_STATUS_IS_OK(status)) {
3814                         goto fail;
3815                 }
3816
3817                 status = fsp_set_smb_fname(fsp, smb_fname);
3818                 if (!NT_STATUS_IS_OK(status)) {
3819                         goto fail;
3820                 }
3821
3822                 if (base_fsp) {
3823                         /*
3824                          * We're opening the stream element of a
3825                          * base_fsp we already opened. Set up the
3826                          * base_fsp pointer.
3827                          */
3828                         fsp->base_fsp = base_fsp;
3829                 }
3830
3831                 if (allocation_size) {
3832                         fsp->initial_allocation_size = smb_roundup(fsp->conn,
3833                                                         allocation_size);
3834                 }
3835
3836                 status = open_file_ntcreate(conn,
3837                                             req,
3838                                             access_mask,
3839                                             share_access,
3840                                             create_disposition,
3841                                             create_options,
3842                                             file_attributes,
3843                                             oplock_request,
3844                                             private_flags,
3845                                             &info,
3846                                             fsp);
3847
3848                 if(!NT_STATUS_IS_OK(status)) {
3849                         file_free(req, fsp);
3850                         fsp = NULL;
3851                 }
3852
3853                 if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_IS_A_DIRECTORY)) {
3854
3855                         /* A stream open never opens a directory */
3856
3857                         if (base_fsp) {
3858                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3859                                 goto fail;
3860                         }
3861
3862                         /*
3863                          * Fail the open if it was explicitly a non-directory
3864                          * file.
3865                          */
3866
3867                         if (create_options & FILE_NON_DIRECTORY_FILE) {
3868                                 status = NT_STATUS_FILE_IS_A_DIRECTORY;
3869                                 goto fail;
3870                         }
3871
3872                         oplock_request = 0;
3873                         status = open_directory(
3874                                 conn, req, smb_fname, access_mask,
3875                                 share_access, create_disposition,
3876                                 create_options, file_attributes,
3877                                 &info, &fsp);
3878                 }
3879         }
3880
3881         if (!NT_STATUS_IS_OK(status)) {
3882                 goto fail;
3883         }
3884
3885         fsp->base_fsp = base_fsp;
3886
3887         if ((ea_list != NULL) &&
3888             ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN))) {
3889                 status = set_ea(conn, fsp, fsp->fsp_name, ea_list);
3890                 if (!NT_STATUS_IS_OK(status)) {
3891                         goto fail;
3892                 }
3893         }
3894
3895         if (!fsp->is_directory && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
3896                 status = NT_STATUS_ACCESS_DENIED;
3897                 goto fail;
3898         }
3899
3900         /* Save the requested allocation size. */
3901         if ((info == FILE_WAS_CREATED) || (info == FILE_WAS_OVERWRITTEN)) {
3902                 if (allocation_size
3903                     && (allocation_size > fsp->fsp_name->st.st_ex_size)) {
3904                         fsp->initial_allocation_size = smb_roundup(
3905                                 fsp->conn, allocation_size);
3906                         if (fsp->is_directory) {
3907                                 /* Can't set allocation size on a directory. */
3908                                 status = NT_STATUS_ACCESS_DENIED;
3909                                 goto fail;
3910                         }
3911                         if (vfs_allocate_file_space(
3912                                     fsp, fsp->initial_allocation_size) == -1) {
3913                                 status = NT_STATUS_DISK_FULL;
3914                                 goto fail;
3915                         }
3916                 } else {
3917                         fsp->initial_allocation_size = smb_roundup(
3918                                 fsp->conn, (uint64_t)fsp->fsp_name->st.st_ex_size);
3919                 }
3920         } else {
3921                 fsp->initial_allocation_size = 0;
3922         }
3923
3924         if ((info == FILE_WAS_CREATED) && lp_nt_acl_support(SNUM(conn)) &&
3925                                 fsp->base_fsp == NULL) {
3926                 if (sd != NULL) {
3927                         /*
3928                          * According to the MS documentation, the only time the security
3929                          * descriptor is applied to the opened file is iff we *created* the
3930                          * file; an existing file stays the same.
3931                          *
3932                          * Also, it seems (from observation) that you can open the file with
3933                          * any access mask but you can still write the sd. We need to override
3934                          * the granted access before we call set_sd
3935                          * Patch for bug #2242 from Tom Lackemann <cessnatomny@yahoo.com>.
3936                          */
3937
3938                         uint32_t sec_info_sent;
3939                         uint32_t saved_access_mask = fsp->access_mask;
3940
3941                         sec_info_sent = get_sec_info(sd);
3942
3943                         fsp->access_mask = FILE_GENERIC_ALL;
3944
3945                         if (sec_info_sent & (SECINFO_OWNER|
3946                                                 SECINFO_GROUP|
3947                                                 SECINFO_DACL|
3948                                                 SECINFO_SACL)) {
3949                                 status = set_sd(fsp, sd, sec_info_sent);
3950                         }
3951
3952                         fsp->access_mask = saved_access_mask;
3953
3954                         if (!NT_STATUS_IS_OK(status)) {
3955                                 goto fail;
3956                         }
3957                 } else if (lp_inherit_acls(SNUM(conn))) {
3958                         /* Inherit from parent. Errors here are not fatal. */
3959                         status = inherit_new_acl(fsp);
3960                         if (!NT_STATUS_IS_OK(status)) {
3961                                 DEBUG(10,("inherit_new_acl: failed for %s with %s\n",
3962                                         fsp_str_dbg(fsp),
3963                                         nt_errstr(status) ));
3964                         }
3965                 }
3966         }
3967
3968         DEBUG(10, ("create_file_unixpath: info=%d\n", info));
3969
3970         *result = fsp;
3971         if (pinfo != NULL) {
3972                 *pinfo = info;
3973         }
3974
3975         smb_fname->st = fsp->fsp_name->st;
3976
3977         return NT_STATUS_OK;
3978
3979  fail:
3980         DEBUG(10, ("create_file_unixpath: %s\n", nt_errstr(status)));
3981
3982         if (fsp != NULL) {
3983                 if (base_fsp && fsp->base_fsp == base_fsp) {
3984                         /*
3985                          * The close_file below will close
3986                          * fsp->base_fsp.
3987                          */
3988                         base_fsp = NULL;
3989                 }
3990                 close_file(req, fsp, ERROR_CLOSE);
3991                 fsp = NULL;
3992         }
3993         if (base_fsp != NULL) {
3994                 close_file(req, base_fsp, ERROR_CLOSE);
3995                 base_fsp = NULL;
3996         }
3997         return status;
3998 }
3999
4000 /*
4001  * Calculate the full path name given a relative fid.
4002  */
4003 NTSTATUS get_relative_fid_filename(connection_struct *conn,
4004                                    struct smb_request *req,
4005                                    uint16_t root_dir_fid,
4006                                    const struct smb_filename *smb_fname,
4007                                    struct smb_filename **smb_fname_out)
4008 {
4009         files_struct *dir_fsp;
4010         char *parent_fname = NULL;
4011         char *new_base_name = NULL;
4012         NTSTATUS status;
4013
4014         if (root_dir_fid == 0 || !smb_fname) {
4015                 status = NT_STATUS_INTERNAL_ERROR;
4016                 goto out;
4017         }
4018
4019         dir_fsp = file_fsp(req, root_dir_fid);
4020
4021         if (dir_fsp == NULL) {
4022                 status = NT_STATUS_INVALID_HANDLE;
4023                 goto out;
4024         }
4025
4026         if (is_ntfs_stream_smb_fname(dir_fsp->fsp_name)) {
4027                 status = NT_STATUS_INVALID_HANDLE;
4028                 goto out;
4029         }
4030
4031         if (!dir_fsp->is_directory) {
4032
4033                 /*
4034                  * Check to see if this is a mac fork of some kind.
4035                  */
4036
4037                 if ((conn->fs_capabilities & FILE_NAMED_STREAMS) &&
4038                     is_ntfs_stream_smb_fname(smb_fname)) {
4039                         status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
4040                         goto out;
4041                 }
4042
4043                 /*
4044                   we need to handle the case when we get a
4045                   relative open relative to a file and the
4046                   pathname is blank - this is a reopen!
4047                   (hint from demyn plantenberg)
4048                 */
4049
4050                 status = NT_STATUS_INVALID_HANDLE;
4051                 goto out;
4052         }
4053
4054         if (ISDOT(dir_fsp->fsp_name->base_name)) {
4055                 /*
4056                  * We're at the toplevel dir, the final file name
4057                  * must not contain ./, as this is filtered out
4058                  * normally by srvstr_get_path and unix_convert
4059                  * explicitly rejects paths containing ./.
4060                  */
4061                 parent_fname = talloc_strdup(talloc_tos(), "");
4062                 if (parent_fname == NULL) {
4063                         status = NT_STATUS_NO_MEMORY;
4064                         goto out;
4065                 }
4066         } else {
4067                 size_t dir_name_len = strlen(dir_fsp->fsp_name->base_name);
4068
4069                 /*
4070                  * Copy in the base directory name.
4071                  */
4072
4073                 parent_fname = talloc_array(talloc_tos(), char,
4074                     dir_name_len+2);
4075                 if (parent_fname == NULL) {
4076                         status = NT_STATUS_NO_MEMORY;
4077                         goto out;
4078                 }
4079                 memcpy(parent_fname, dir_fsp->fsp_name->base_name,
4080                     dir_name_len+1);
4081
4082                 /*
4083                  * Ensure it ends in a '/'.
4084                  * We used TALLOC_SIZE +2 to add space for the '/'.
4085                  */
4086
4087                 if(dir_name_len
4088                     && (parent_fname[dir_name_len-1] != '\\')
4089                     && (parent_fname[dir_name_len-1] != '/')) {
4090                         parent_fname[dir_name_len] = '/';
4091                         parent_fname[dir_name_len+1] = '\0';
4092                 }
4093         }
4094
4095         new_base_name = talloc_asprintf(talloc_tos(), "%s%s", parent_fname,
4096                                         smb_fname->base_name);
4097         if (new_base_name == NULL) {
4098                 status = NT_STATUS_NO_MEMORY;
4099                 goto out;
4100         }
4101
4102         status = filename_convert(req,
4103                                 conn,
4104                                 req->flags2 & FLAGS2_DFS_PATHNAMES,
4105                                 new_base_name,
4106                                 0,
4107                                 NULL,
4108                                 smb_fname_out);
4109         if (!NT_STATUS_IS_OK(status)) {
4110                 goto out;
4111         }
4112
4113  out:
4114         TALLOC_FREE(parent_fname);
4115         TALLOC_FREE(new_base_name);
4116         return status;
4117 }
4118
4119 NTSTATUS create_file_default(connection_struct *conn,
4120                              struct smb_request *req,
4121                              uint16_t root_dir_fid,
4122                              struct smb_filename *smb_fname,
4123                              uint32_t access_mask,
4124                              uint32_t share_access,
4125                              uint32_t create_disposition,
4126                              uint32_t create_options,
4127                              uint32_t file_attributes,
4128                              uint32_t oplock_request,
4129                              uint64_t allocation_size,
4130                              uint32_t private_flags,
4131                              struct security_descriptor *sd,
4132                              struct ea_list *ea_list,
4133                              files_struct **result,
4134                              int *pinfo)
4135 {
4136         int info = FILE_WAS_OPENED;
4137         files_struct *fsp = NULL;
4138         NTSTATUS status;
4139         bool stream_name = false;
4140
4141         DEBUG(10,("create_file: access_mask = 0x%x "
4142                   "file_attributes = 0x%x, share_access = 0x%x, "
4143                   "create_disposition = 0x%x create_options = 0x%x "
4144                   "oplock_request = 0x%x "
4145                   "private_flags = 0x%x "
4146                   "root_dir_fid = 0x%x, ea_list = 0x%p, sd = 0x%p, "
4147                   "fname = %s\n",
4148                   (unsigned int)access_mask,
4149                   (unsigned int)file_attributes,
4150                   (unsigned int)share_access,
4151                   (unsigned int)create_disposition,
4152                   (unsigned int)create_options,
4153                   (unsigned int)oplock_request,
4154                   (unsigned int)private_flags,
4155                   (unsigned int)root_dir_fid,
4156                   ea_list, sd, smb_fname_str_dbg(smb_fname)));
4157
4158         /*
4159          * Calculate the filename from the root_dir_if if necessary.
4160          */
4161
4162         if (root_dir_fid != 0) {
4163                 struct smb_filename *smb_fname_out = NULL;
4164                 status = get_relative_fid_filename(conn, req, root_dir_fid,
4165                                                    smb_fname, &smb_fname_out);
4166                 if (!NT_STATUS_IS_OK(status)) {
4167                         goto fail;
4168                 }
4169                 smb_fname = smb_fname_out;
4170         }
4171
4172         /*
4173          * Check to see if this is a mac fork of some kind.
4174          */
4175
4176         stream_name = is_ntfs_stream_smb_fname(smb_fname);
4177         if (stream_name) {
4178                 enum FAKE_FILE_TYPE fake_file_type;
4179
4180                 fake_file_type = is_fake_file(smb_fname);
4181
4182                 if (fake_file_type != FAKE_FILE_TYPE_NONE) {
4183
4184                         /*
4185                          * Here we go! support for changing the disk quotas
4186                          * --metze
4187                          *
4188                          * We need to fake up to open this MAGIC QUOTA file
4189                          * and return a valid FID.
4190                          *
4191                          * w2k close this file directly after openening xp
4192                          * also tries a QUERY_FILE_INFO on the file and then
4193                          * close it
4194                          */
4195                         status = open_fake_file(req, conn, req->vuid,
4196                                                 fake_file_type, smb_fname,
4197                                                 access_mask, &fsp);
4198                         if (!NT_STATUS_IS_OK(status)) {
4199                                 goto fail;
4200                         }
4201
4202                         ZERO_STRUCT(smb_fname->st);
4203                         goto done;
4204                 }
4205
4206                 if (!(conn->fs_capabilities & FILE_NAMED_STREAMS)) {
4207                         status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
4208                         goto fail;
4209                 }
4210         }
4211
4212         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
4213                 int ret;
4214                 smb_fname->stream_name = NULL;
4215                 /* We have to handle this error here. */
4216                 if (create_options & FILE_DIRECTORY_FILE) {
4217                         status = NT_STATUS_NOT_A_DIRECTORY;
4218                         goto fail;
4219                 }
4220                 if (lp_posix_pathnames()) {
4221                         ret = SMB_VFS_LSTAT(conn, smb_fname);
4222                 } else {
4223                         ret = SMB_VFS_STAT(conn, smb_fname);
4224                 }
4225
4226                 if (ret == 0 && VALID_STAT_OF_DIR(smb_fname->st)) {
4227                         status = NT_STATUS_FILE_IS_A_DIRECTORY;
4228                         goto fail;
4229                 }
4230         }
4231
4232         status = create_file_unixpath(
4233                 conn, req, smb_fname, access_mask, share_access,
4234                 create_disposition, create_options, file_attributes,
4235                 oplock_request, allocation_size, private_flags,
4236                 sd, ea_list,
4237                 &fsp, &info);
4238
4239         if (!NT_STATUS_IS_OK(status)) {
4240                 goto fail;
4241         }
4242
4243  done:
4244         DEBUG(10, ("create_file: info=%d\n", info));
4245
4246         *result = fsp;
4247         if (pinfo != NULL) {
4248                 *pinfo = info;
4249         }
4250         return NT_STATUS_OK;
4251
4252  fail:
4253         DEBUG(10, ("create_file: %s\n", nt_errstr(status)));
4254
4255         if (fsp != NULL) {
4256                 close_file(req, fsp, ERROR_CLOSE);
4257                 fsp = NULL;
4258         }
4259         return status;
4260 }