source3/smbd/dosmode.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    dos mode handling functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) James Peach 2006
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22
  23 static int set_sparse_flag(const SMB_STRUCT_STAT * const sbuf)
  24 {
  25 #if defined (HAVE_STAT_ST_BLOCKS) && defined(STAT_ST_BLOCKSIZE)
  26         if (sbuf->st_ex_size > sbuf->st_ex_blocks * (SMB_OFF_T)STAT_ST_BLOCKSIZE) {
  27                 return FILE_ATTRIBUTE_SPARSE;
  28         }
  29 #endif
  30         return 0;
  31 }
  32
  33 static int set_link_read_only_flag(const SMB_STRUCT_STAT *const sbuf)
  34 {
  35 #ifdef S_ISLNK
  36 #if LINKS_READ_ONLY
  37         if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
  38                 return aRONLY;
  39 #endif
  40 #endif
  41         return 0;
  42 }
  43
  44 /****************************************************************************
  45  Change a dos mode to a unix mode.
  46     Base permission for files:
  47          if creating file and inheriting (i.e. parent_dir != NULL)
  48            apply read/write bits from parent directory.
  49          else
  50            everybody gets read bit set
  51          dos readonly is represented in unix by removing everyone's write bit
  52          dos archive is represented in unix by the user's execute bit
  53          dos system is represented in unix by the group's execute bit
  54          dos hidden is represented in unix by the other's execute bit
  55          if !inheriting {
  56            Then apply create mask,
  57            then add force bits.
  58          }
  59     Base permission for directories:
  60          dos directory is represented in unix by unix's dir bit and the exec bit
  61          if !inheriting {
  62            Then apply create mask,
  63            then add force bits.
  64          }
  65 ****************************************************************************/
  66
  67 mode_t unix_mode(connection_struct *conn, int dosmode,
  68                  const struct smb_filename *smb_fname,
  69                  const char *inherit_from_dir)
  70 {
  71         mode_t result = (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
  72         mode_t dir_mode = 0; /* Mode of the inherit_from directory if
  73                               * inheriting. */
  74
  75         if (!lp_store_dos_attributes(SNUM(conn)) && IS_DOS_READONLY(dosmode)) {
  76                 result &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
  77         }
  78
  79         if ((inherit_from_dir != NULL) && lp_inherit_perms(SNUM(conn))) {
  80                 struct smb_filename *smb_fname_parent = NULL;
  81                 NTSTATUS status;
  82
  83                 DEBUG(2, ("unix_mode(%s) inheriting from %s\n",
  84                           smb_fname_str_dbg(smb_fname),
  85                           inherit_from_dir));
  86
  87                 status = create_synthetic_smb_fname(talloc_tos(),
  88                                                     inherit_from_dir, NULL,
  89                                                     NULL, &smb_fname_parent);
  90                 if (!NT_STATUS_IS_OK(status)) {
  91                         DEBUG(1,("unix_mode(%s) failed, [dir %s]: %s\n",
  92                                  smb_fname_str_dbg(smb_fname),
  93                                  inherit_from_dir, nt_errstr(status)));
  94                         return(0);
  95                 }
  96
  97                 if (SMB_VFS_STAT(conn, smb_fname_parent) != 0) {
  98                         DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",
  99                                  smb_fname_str_dbg(smb_fname),
 100                                  inherit_from_dir, strerror(errno)));
 101                         TALLOC_FREE(smb_fname_parent);
 102                         return(0);      /* *** shouldn't happen! *** */
 103                 }
 104
 105                 /* Save for later - but explicitly remove setuid bit for safety. */
 106                 dir_mode = smb_fname_parent->st.st_ex_mode & ~S_ISUID;
 107                 DEBUG(2,("unix_mode(%s) inherit mode %o\n",
 108                          smb_fname_str_dbg(smb_fname), (int)dir_mode));
 109                 /* Clear "result" */
 110                 result = 0;
 111                 TALLOC_FREE(smb_fname_parent);
 112         }
 113
 114         if (IS_DOS_DIR(dosmode)) {
 115                 /* We never make directories read only for the owner as under DOS a user
 116                 can always create a file in a read-only directory. */
 117                 result |= (S_IFDIR | S_IWUSR);
 118
 119                 if (dir_mode) {
 120                         /* Inherit mode of parent directory. */
 121                         result |= dir_mode;
 122                 } else {
 123                         /* Provisionally add all 'x' bits */
 124                         result |= (S_IXUSR | S_IXGRP | S_IXOTH);
 125
 126                         /* Apply directory mask */
 127                         result &= lp_dir_mask(SNUM(conn));
 128                         /* Add in force bits */
 129                         result |= lp_force_dir_mode(SNUM(conn));
 130                 }
 131         } else {
 132                 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
 133                         result |= S_IXUSR;
 134
 135                 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
 136                         result |= S_IXGRP;
 137
 138                 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
 139                         result |= S_IXOTH;
 140
 141                 if (dir_mode) {
 142                         /* Inherit 666 component of parent directory mode */
 143                         result |= dir_mode & (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
 144                 } else {
 145                         /* Apply mode mask */
 146                         result &= lp_create_mask(SNUM(conn));
 147                         /* Add in force bits */
 148                         result |= lp_force_create_mode(SNUM(conn));
 149                 }
 150         }
 151
 152         DEBUG(3,("unix_mode(%s) returning 0%o\n", smb_fname_str_dbg(smb_fname),
 153                  (int)result));
 154         return(result);
 155 }
 156
 157 /****************************************************************************
 158  Change a unix mode to a dos mode.
 159 ****************************************************************************/
 160
 161 static uint32 dos_mode_from_sbuf(connection_struct *conn,
 162                                  const struct smb_filename *smb_fname)
 163 {
 164         int result = 0;
 165         enum mapreadonly_options ro_opts = (enum mapreadonly_options)lp_map_readonly(SNUM(conn));
 166
 167         if (ro_opts == MAP_READONLY_YES) {
 168                 /* Original Samba method - map inverse of user "w" bit. */
 169                 if ((smb_fname->st.st_ex_mode & S_IWUSR) == 0) {
 170                         result |= aRONLY;
 171                 }
 172         } else if (ro_opts == MAP_READONLY_PERMISSIONS) {
 173                 /* Check actual permissions for read-only. */
 174                 if (!can_write_to_file(conn, smb_fname)) {
 175                         result |= aRONLY;
 176                 }
 177         } /* Else never set the readonly bit. */
 178
 179         if (MAP_ARCHIVE(conn) && ((smb_fname->st.st_ex_mode & S_IXUSR) != 0))
 180                 result |= aARCH;
 181
 182         if (MAP_SYSTEM(conn) && ((smb_fname->st.st_ex_mode & S_IXGRP) != 0))
 183                 result |= aSYSTEM;
 184
 185         if (MAP_HIDDEN(conn) && ((smb_fname->st.st_ex_mode & S_IXOTH) != 0))
 186                 result |= aHIDDEN;
 187
 188         if (S_ISDIR(smb_fname->st.st_ex_mode))
 189                 result = aDIR | (result & aRONLY);
 190
 191         result |= set_sparse_flag(&smb_fname->st);
 192         result |= set_link_read_only_flag(&smb_fname->st);
 193
 194         DEBUG(8,("dos_mode_from_sbuf returning "));
 195
 196         if (result & aHIDDEN) DEBUG(8, ("h"));
 197         if (result & aRONLY ) DEBUG(8, ("r"));
 198         if (result & aSYSTEM) DEBUG(8, ("s"));
 199         if (result & aDIR   ) DEBUG(8, ("d"));
 200         if (result & aARCH  ) DEBUG(8, ("a"));
 201
 202         DEBUG(8,("\n"));
 203         return result;
 204 }
 205
 206 /****************************************************************************
 207  Get DOS attributes from an EA.
 208 ****************************************************************************/
 209
 210 static bool get_ea_dos_attribute(connection_struct *conn,
 211                                  const struct smb_filename *smb_fname,
 212                                  uint32 *pattr)
 213 {
 214         ssize_t sizeret;
 215         fstring attrstr;
 216         unsigned int dosattr;
 217
 218         if (!lp_store_dos_attributes(SNUM(conn))) {
 219                 return False;
 220         }
 221
 222         /* Don't reset pattr to zero as we may already have filename-based attributes we
 223            need to preserve. */
 224
 225         sizeret = SMB_VFS_GETXATTR(conn, smb_fname->base_name,
 226                                    SAMBA_XATTR_DOS_ATTRIB, attrstr,
 227                                    sizeof(attrstr));
 228         if (sizeret == -1) {
 229                 if (errno == ENOSYS
 230 #if defined(ENOTSUP)
 231                         || errno == ENOTSUP) {
 232 #else
 233                                 ) {
 234 #endif
 235                         DEBUG(1,("get_ea_dos_attributes: Cannot get attribute "
 236                                  "from EA on file %s: Error = %s\n",
 237                                  smb_fname_str_dbg(smb_fname),
 238                                  strerror(errno)));
 239                         set_store_dos_attributes(SNUM(conn), False);
 240                 }
 241                 return False;
 242         }
 243         /* Null terminate string. */
 244         attrstr[sizeret] = 0;
 245         DEBUG(10,("get_ea_dos_attribute: %s attrstr = %s\n",
 246                   smb_fname_str_dbg(smb_fname), attrstr));
 247
 248         if (sizeret < 2 || attrstr[0] != '0' || attrstr[1] != 'x' ||
 249                         sscanf(attrstr, "%x", &dosattr) != 1) {
 250                 DEBUG(1,("get_ea_dos_attributes: Badly formed DOSATTRIB on "
 251                          "file %s - %s\n", smb_fname_str_dbg(smb_fname),
 252                          attrstr));
 253                 return False;
 254         }
 255
 256         if (S_ISDIR(smb_fname->st.st_ex_mode)) {
 257                 dosattr |= aDIR;
 258         }
 259         *pattr = (uint32)(dosattr & SAMBA_ATTRIBUTES_MASK);
 260
 261         DEBUG(8,("get_ea_dos_attribute returning (0x%x)", dosattr));
 262
 263         if (dosattr & aHIDDEN) DEBUG(8, ("h"));
 264         if (dosattr & aRONLY ) DEBUG(8, ("r"));
 265         if (dosattr & aSYSTEM) DEBUG(8, ("s"));
 266         if (dosattr & aDIR   ) DEBUG(8, ("d"));
 267         if (dosattr & aARCH  ) DEBUG(8, ("a"));
 268
 269         DEBUG(8,("\n"));
 270
 271         return True;
 272 }
 273
 274 /****************************************************************************
 275  Set DOS attributes in an EA.
 276 ****************************************************************************/
 277
 278 static bool set_ea_dos_attribute(connection_struct *conn,
 279                                  struct smb_filename *smb_fname,
 280                                  uint32 dosmode)
 281 {
 282         fstring attrstr;
 283         files_struct *fsp = NULL;
 284         bool ret = False;
 285
 286         if (!lp_store_dos_attributes(SNUM(conn))) {
 287                 return False;
 288         }
 289
 290         snprintf(attrstr, sizeof(attrstr)-1, "0x%x", dosmode & SAMBA_ATTRIBUTES_MASK);
 291         if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
 292                              SAMBA_XATTR_DOS_ATTRIB, attrstr, strlen(attrstr),
 293                              0) == -1) {
 294                 if((errno != EPERM) && (errno != EACCES)) {
 295                         if (errno == ENOSYS
 296 #if defined(ENOTSUP)
 297                                 || errno == ENOTSUP) {
 298 #else
 299                                 ) {
 300 #endif
 301                                 DEBUG(1,("set_ea_dos_attributes: Cannot set "
 302                                          "attribute EA on file %s: Error = %s\n",
 303                                          smb_fname_str_dbg(smb_fname),
 304                                          strerror(errno) ));
 305                                 set_store_dos_attributes(SNUM(conn), False);
 306                         }
 307                         return False;
 308                 }
 309
 310                 /* We want DOS semantics, ie allow non owner with write permission to change the
 311                         bits on a file. Just like file_ntimes below.
 312                 */
 313
 314                 /* Check if we have write access. */
 315                 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
 316                         return False;
 317
 318                 /*
 319                  * We need to open the file with write access whilst
 320                  * still in our current user context. This ensures we
 321                  * are not violating security in doing the setxattr.
 322                  */
 323
 324                 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname,
 325                                                       &fsp)))
 326                         return ret;
 327                 become_root();
 328                 if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
 329                                      SAMBA_XATTR_DOS_ATTRIB, attrstr,
 330                                      strlen(attrstr), 0) == 0) {
 331                         ret = True;
 332                 }
 333                 unbecome_root();
 334                 close_file_fchmod(NULL, fsp);
 335                 return ret;
 336         }
 337         DEBUG(10,("set_ea_dos_attribute: set EA %s on file %s\n", attrstr,
 338                   smb_fname_str_dbg(smb_fname)));
 339         return True;
 340 }
 341
 342 /****************************************************************************
 343  Change a unix mode to a dos mode for an ms dfs link.
 344 ****************************************************************************/
 345
 346 uint32 dos_mode_msdfs(connection_struct *conn,
 347                       const struct smb_filename *smb_fname)
 348 {
 349         uint32 result = 0;
 350
 351         DEBUG(8,("dos_mode_msdfs: %s\n", smb_fname_str_dbg(smb_fname)));
 352
 353         if (!VALID_STAT(smb_fname->st)) {
 354                 return 0;
 355         }
 356
 357         /* First do any modifications that depend on the path name. */
 358         /* hide files with a name starting with a . */
 359         if (lp_hide_dot_files(SNUM(conn))) {
 360                 const char *p = strrchr_m(smb_fname->base_name, '/');
 361                 if (p) {
 362                         p++;
 363                 } else {
 364                         p = smb_fname->base_name;
 365                 }
 366
 367                 /* Only . and .. are not hidden. */
 368                 if (p[0] == '.' && !((p[1] == '\0') ||
 369                                 (p[1] == '.' && p[2] == '\0'))) {
 370                         result |= aHIDDEN;
 371                 }
 372         }
 373
 374         result |= dos_mode_from_sbuf(conn, smb_fname);
 375
 376         /* Optimization : Only call is_hidden_path if it's not already
 377            hidden. */
 378         if (!(result & aHIDDEN) &&
 379             IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
 380                 result |= aHIDDEN;
 381         }
 382
 383         DEBUG(8,("dos_mode_msdfs returning "));
 384
 385         if (result & aHIDDEN) DEBUG(8, ("h"));
 386         if (result & aRONLY ) DEBUG(8, ("r"));
 387         if (result & aSYSTEM) DEBUG(8, ("s"));
 388         if (result & aDIR   ) DEBUG(8, ("d"));
 389         if (result & aARCH  ) DEBUG(8, ("a"));
 390         if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
 391
 392         DEBUG(8,("\n"));
 393
 394         return(result);
 395 }
 396
 397 #ifdef HAVE_STAT_DOS_FLAGS
 398 /****************************************************************************
 399  Convert dos attributes (FILE_ATTRIBUTE_*) to dos stat flags (UF_*)
 400 ****************************************************************************/
 401
 402 int dos_attributes_to_stat_dos_flags(uint32_t dosmode)
 403 {
 404         uint32_t dos_stat_flags = 0;
 405
 406         if (dosmode & aARCH)
 407                 dos_stat_flags |= UF_DOS_ARCHIVE;
 408         if (dosmode & aHIDDEN)
 409                 dos_stat_flags |= UF_DOS_HIDDEN;
 410         if (dosmode & aRONLY)
 411                 dos_stat_flags |= UF_DOS_RO;
 412         if (dosmode & aSYSTEM)
 413                 dos_stat_flags |= UF_DOS_SYSTEM;
 414         if (dosmode & FILE_ATTRIBUTE_NONINDEXED)
 415                 dos_stat_flags |= UF_DOS_NOINDEX;
 416
 417         return dos_stat_flags;
 418 }
 419
 420 /****************************************************************************
 421  Gets DOS attributes, accessed via st_ex_flags in the stat struct.
 422 ****************************************************************************/
 423
 424 static bool get_stat_dos_flags(connection_struct *conn,
 425                                const struct smb_filename *smb_fname,
 426                                uint32_t *dosmode)
 427 {
 428         SMB_ASSERT(VALID_STAT(smb_fname->st));
 429         SMB_ASSERT(dosmode);
 430
 431         if (!lp_store_dos_attributes(SNUM(conn))) {
 432                 return false;
 433         }
 434
 435         DEBUG(5, ("Getting stat dos attributes for %s.\n",
 436                   smb_fname_str_dbg(smb_fname)));
 437
 438         if (smb_fname->st.st_ex_flags & UF_DOS_ARCHIVE)
 439                 *dosmode |= aARCH;
 440         if (smb_fname->st.st_ex_flags & UF_DOS_HIDDEN)
 441                 *dosmode |= aHIDDEN;
 442         if (smb_fname->st.st_ex_flags & UF_DOS_RO)
 443                 *dosmode |= aRONLY;
 444         if (smb_fname->st.st_ex_flags & UF_DOS_SYSTEM)
 445                 *dosmode |= aSYSTEM;
 446         if (smb_fname->st.st_ex_flags & UF_DOS_NOINDEX)
 447                 *dosmode |= FILE_ATTRIBUTE_NONINDEXED;
 448         if (S_ISDIR(smb_fname->st.st_ex_mode))
 449                 *dosmode |= aDIR;
 450
 451         *dosmode |= set_sparse_flag(&smb_fname->st);
 452         *dosmode |= set_link_read_only_flag(&smb_fname->st);
 453
 454         return true;
 455 }
 456
 457 /****************************************************************************
 458  Sets DOS attributes, stored in st_ex_flags of the inode.
 459 ****************************************************************************/
 460
 461 static bool set_stat_dos_flags(connection_struct *conn,
 462                                const struct smb_filename *smb_fname,
 463                                uint32_t dosmode,
 464                                bool *attributes_changed)
 465 {
 466         uint32_t new_flags = 0;
 467         int error = 0;
 468
 469         SMB_ASSERT(VALID_STAT(smb_fname->st));
 470         SMB_ASSERT(attributes_changed);
 471
 472         *attributes_changed = false;
 473
 474         if (!lp_store_dos_attributes(SNUM(conn))) {
 475                 return false;
 476         }
 477
 478         DEBUG(5, ("Setting stat dos attributes for %s.\n",
 479                   smb_fname_str_dbg(smb_fname)));
 480
 481         new_flags = (smb_fname->st.st_ex_flags & ~UF_DOS_FLAGS) |
 482                      dos_attributes_to_stat_dos_flags(dosmode);
 483
 484         /* Return early if no flags changed. */
 485         if (new_flags == smb_fname->st.st_ex_flags)
 486                 return true;
 487
 488         DEBUG(5, ("Setting stat dos attributes=0x%x, prev=0x%x\n", new_flags,
 489                   smb_fname->st.st_ex_flags));
 490
 491         /* Set new flags with chflags. */
 492         error = SMB_VFS_CHFLAGS(conn, smb_fname->base_name, new_flags);
 493         if (error) {
 494                 DEBUG(0, ("Failed setting new stat dos attributes (0x%x) on "
 495                           "file %s! errno=%d\n", new_flags,
 496                           smb_fname_str_dbg(smb_fname), errno));
 497                 return false;
 498         }
 499
 500         *attributes_changed = true;
 501         return true;
 502 }
 503 #endif /* HAVE_STAT_DOS_FLAGS */
 504
 505 /****************************************************************************
 506  Change a unix mode to a dos mode.
 507 ****************************************************************************/
 508
 509 uint32 dos_mode(connection_struct *conn, const struct smb_filename *smb_fname)
 510 {
 511         SMB_STRUCT_STAT sbuf;
 512         uint32 result = 0;
 513         bool offline, used_stat_dos_flags = false;
 514
 515         DEBUG(8,("dos_mode: %s\n", smb_fname_str_dbg(smb_fname)));
 516
 517         if (!VALID_STAT(smb_fname->st)) {
 518                 return 0;
 519         }
 520
 521         /* First do any modifications that depend on the path name. */
 522         /* hide files with a name starting with a . */
 523         if (lp_hide_dot_files(SNUM(conn))) {
 524                 const char *p = strrchr_m(smb_fname->base_name,'/');
 525                 if (p) {
 526                         p++;
 527                 } else {
 528                         p = smb_fname->base_name;
 529                 }
 530
 531                 /* Only . and .. are not hidden. */
 532                 if (p[0] == '.' && !((p[1] == '\0') ||
 533                                 (p[1] == '.' && p[2] == '\0'))) {
 534                         result |= aHIDDEN;
 535                 }
 536         }
 537
 538 #ifdef HAVE_STAT_DOS_FLAGS
 539         used_stat_dos_flags = get_stat_dos_flags(conn, smb_fname, &result);
 540 #endif
 541         if (!used_stat_dos_flags) {
 542                 /* Get the DOS attributes from an EA by preference. */
 543                 if (get_ea_dos_attribute(conn, smb_fname, &result)) {
 544                         result |= set_sparse_flag(&smb_fname->st);
 545                 } else {
 546                         result |= dos_mode_from_sbuf(conn, smb_fname);
 547                 }
 548         }
 549
 550         sbuf = smb_fname->st;
 551         offline = SMB_VFS_IS_OFFLINE(conn, smb_fname->base_name, &sbuf);
 552         if (S_ISREG(sbuf.st_ex_mode) && offline) {
 553                 result |= FILE_ATTRIBUTE_OFFLINE;
 554         }
 555
 556         /* Optimization : Only call is_hidden_path if it's not already
 557            hidden. */
 558         if (!(result & aHIDDEN) &&
 559             IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
 560                 result |= aHIDDEN;
 561         }
 562
 563         DEBUG(8,("dos_mode returning "));
 564
 565         if (result & aHIDDEN) DEBUG(8, ("h"));
 566         if (result & aRONLY ) DEBUG(8, ("r"));
 567         if (result & aSYSTEM) DEBUG(8, ("s"));
 568         if (result & aDIR   ) DEBUG(8, ("d"));
 569         if (result & aARCH  ) DEBUG(8, ("a"));
 570         if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
 571
 572         DEBUG(8,("\n"));
 573
 574         return(result);
 575 }
 576
 577 /*******************************************************************
 578  chmod a file - but preserve some bits.
 579 ********************************************************************/
 580
 581 int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
 582                      uint32 dosmode, const char *parent_dir, bool newfile)
 583 {
 584         int mask=0;
 585         mode_t tmp;
 586         mode_t unixmode;
 587         int ret = -1, lret = -1;
 588         uint32_t old_mode;
 589
 590         /* We only allow READONLY|HIDDEN|SYSTEM|DIRECTORY|ARCHIVE here. */
 591         dosmode &= (SAMBA_ATTRIBUTES_MASK | FILE_ATTRIBUTE_OFFLINE);
 592
 593         DEBUG(10,("file_set_dosmode: setting dos mode 0x%x on file %s\n",
 594                   dosmode, smb_fname_str_dbg(smb_fname)));
 595
 596         if (!VALID_STAT(smb_fname->st)) {
 597                 if (SMB_VFS_STAT(conn, smb_fname))
 598                         return(-1);
 599         }
 600
 601         unixmode = smb_fname->st.st_ex_mode;
 602
 603         get_acl_group_bits(conn, smb_fname->base_name,
 604                            &smb_fname->st.st_ex_mode);
 605
 606         if (S_ISDIR(smb_fname->st.st_ex_mode))
 607                 dosmode |= aDIR;
 608         else
 609                 dosmode &= ~aDIR;
 610
 611         old_mode = dos_mode(conn, smb_fname);
 612
 613         if (dosmode & FILE_ATTRIBUTE_OFFLINE) {
 614                 if (!(old_mode & FILE_ATTRIBUTE_OFFLINE)) {
 615                         lret = SMB_VFS_SET_OFFLINE(conn, smb_fname->base_name);
 616                         if (lret == -1) {
 617                                 DEBUG(0, ("set_dos_mode: client has asked to "
 618                                           "set FILE_ATTRIBUTE_OFFLINE to "
 619                                           "%s/%s but there was an error while "
 620                                           "setting it or it is not "
 621                                           "supported.\n", parent_dir,
 622                                           smb_fname_str_dbg(smb_fname)));
 623                         }
 624                 }
 625         }
 626
 627         dosmode  &= ~FILE_ATTRIBUTE_OFFLINE;
 628         old_mode &= ~FILE_ATTRIBUTE_OFFLINE;
 629
 630         if (old_mode == dosmode) {
 631                 smb_fname->st.st_ex_mode = unixmode;
 632                 return(0);
 633         }
 634
 635 #ifdef HAVE_STAT_DOS_FLAGS
 636         {
 637                 bool attributes_changed;
 638
 639                 if (set_stat_dos_flags(conn, smb_fname, dosmode,
 640                                        &attributes_changed))
 641                 {
 642                         if (!newfile && attributes_changed) {
 643                                 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 644                                     FILE_NOTIFY_CHANGE_ATTRIBUTES,
 645                                     smb_fname->base_name);
 646                         }
 647                         smb_fname->st.st_ex_mode = unixmode;
 648                         return 0;
 649                 }
 650         }
 651 #endif
 652         /* Store the DOS attributes in an EA by preference. */
 653         if (set_ea_dos_attribute(conn, smb_fname, dosmode)) {
 654                 if (!newfile) {
 655                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 656                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 657                                      smb_fname->base_name);
 658                 }
 659                 smb_fname->st.st_ex_mode = unixmode;
 660                 return 0;
 661         }
 662
 663         unixmode = unix_mode(conn, dosmode, smb_fname, parent_dir);
 664
 665         /* preserve the s bits */
 666         mask |= (S_ISUID | S_ISGID);
 667
 668         /* preserve the t bit */
 669 #ifdef S_ISVTX
 670         mask |= S_ISVTX;
 671 #endif
 672
 673         /* possibly preserve the x bits */
 674         if (!MAP_ARCHIVE(conn))
 675                 mask |= S_IXUSR;
 676         if (!MAP_SYSTEM(conn))
 677                 mask |= S_IXGRP;
 678         if (!MAP_HIDDEN(conn))
 679                 mask |= S_IXOTH;
 680
 681         unixmode |= (smb_fname->st.st_ex_mode & mask);
 682
 683         /* if we previously had any r bits set then leave them alone */
 684         if ((tmp = smb_fname->st.st_ex_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
 685                 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
 686                 unixmode |= tmp;
 687         }
 688
 689         /* if we previously had any w bits set then leave them alone
 690                 whilst adding in the new w bits, if the new mode is not rdonly */
 691         if (!IS_DOS_READONLY(dosmode)) {
 692                 unixmode |= (smb_fname->st.st_ex_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
 693         }
 694
 695         ret = SMB_VFS_CHMOD(conn, smb_fname->base_name, unixmode);
 696         if (ret == 0) {
 697                 if(!newfile || (lret != -1)) {
 698                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 699                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 700                                      smb_fname->base_name);
 701                 }
 702                 smb_fname->st.st_ex_mode = unixmode;
 703                 return 0;
 704         }
 705
 706         if((errno != EPERM) && (errno != EACCES))
 707                 return -1;
 708
 709         if(!lp_dos_filemode(SNUM(conn)))
 710                 return -1;
 711
 712         /* We want DOS semantics, ie allow non owner with write permission to change the
 713                 bits on a file. Just like file_ntimes below.
 714         */
 715
 716         /* Check if we have write access. */
 717         if (CAN_WRITE(conn)) {
 718                 /*
 719                  * We need to open the file with write access whilst
 720                  * still in our current user context. This ensures we
 721                  * are not violating security in doing the fchmod.
 722                  * This file open does *not* break any oplocks we are
 723                  * holding. We need to review this.... may need to
 724                  * break batch oplocks open by others. JRA.
 725                  */
 726                 files_struct *fsp;
 727                 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname,
 728                                      &fsp)))
 729                         return -1;
 730                 become_root();
 731                 ret = SMB_VFS_FCHMOD(fsp, unixmode);
 732                 unbecome_root();
 733                 close_file_fchmod(NULL, fsp);
 734                 if (!newfile) {
 735                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 736                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 737                                      smb_fname->base_name);
 738                 }
 739                 if (ret == 0) {
 740                         smb_fname->st.st_ex_mode = unixmode;
 741                 }
 742         }
 743
 744         return( ret );
 745 }
 746
 747 /*******************************************************************
 748  Wrapper around the VFS ntimes that possibly allows DOS semantics rather
 749  than POSIX.
 750 *******************************************************************/
 751
 752 int file_ntimes(connection_struct *conn, const struct smb_filename *smb_fname,
 753                 struct smb_file_time *ft)
 754 {
 755         int ret = -1;
 756
 757         errno = 0;
 758
 759         DEBUG(6, ("file_ntime: actime: %s",
 760                   time_to_asc(convert_timespec_to_time_t(ft->atime))));
 761         DEBUG(6, ("file_ntime: modtime: %s",
 762                   time_to_asc(convert_timespec_to_time_t(ft->mtime))));
 763         DEBUG(6, ("file_ntime: ctime: %s",
 764                   time_to_asc(convert_timespec_to_time_t(ft->ctime))));
 765         DEBUG(6, ("file_ntime: createtime: %s",
 766                   time_to_asc(convert_timespec_to_time_t(ft->create_time))));
 767
 768         /* Don't update the time on read-only shares */
 769         /* We need this as set_filetime (which can be called on
 770            close and other paths) can end up calling this function
 771            without the NEED_WRITE protection. Found by :
 772            Leo Weppelman <leo@wau.mis.ah.nl>
 773         */
 774
 775         if (!CAN_WRITE(conn)) {
 776                 return 0;
 777         }
 778
 779         if(SMB_VFS_NTIMES(conn, smb_fname, ft) == 0) {
 780                 return 0;
 781         }
 782
 783         if((errno != EPERM) && (errno != EACCES)) {
 784                 return -1;
 785         }
 786
 787         if(!lp_dos_filetimes(SNUM(conn))) {
 788                 return -1;
 789         }
 790
 791         /* We have permission (given by the Samba admin) to
 792            break POSIX semantics and allow a user to change
 793            the time on a file they don't own but can write to
 794            (as DOS does).
 795          */
 796
 797         /* Check if we have write access. */
 798         if (can_write_to_file(conn, smb_fname)) {
 799                 /* We are allowed to become root and change the filetime. */
 800                 become_root();
 801                 ret = SMB_VFS_NTIMES(conn, smb_fname, ft);
 802                 unbecome_root();
 803         }
 804
 805         return ret;
 806 }
 807
 808 /******************************************************************
 809  Force a "sticky" write time on a pathname. This will always be
 810  returned on all future write time queries and set on close.
 811 ******************************************************************/
 812
 813 bool set_sticky_write_time_path(struct file_id fileid, struct timespec mtime)
 814 {
 815         if (null_timespec(mtime)) {
 816                 return true;
 817         }
 818
 819         if (!set_sticky_write_time(fileid, mtime)) {
 820                 return false;
 821         }
 822
 823         return true;
 824 }
 825
 826 /******************************************************************
 827  Force a "sticky" write time on an fsp. This will always be
 828  returned on all future write time queries and set on close.
 829 ******************************************************************/
 830
 831 bool set_sticky_write_time_fsp(struct files_struct *fsp, struct timespec mtime)
 832 {
 833         fsp->write_time_forced = true;
 834         TALLOC_FREE(fsp->update_write_time_event);
 835
 836         return set_sticky_write_time_path(fsp->file_id, mtime);
 837 }
 838
 839 /******************************************************************
 840  Update a write time immediately, without the 2 second delay.
 841 ******************************************************************/
 842
 843 bool update_write_time(struct files_struct *fsp)
 844 {
 845         if (!set_write_time(fsp->file_id, timespec_current())) {
 846                 return false;
 847         }
 848
 849         notify_fname(fsp->conn, NOTIFY_ACTION_MODIFIED,
 850                      FILE_NOTIFY_CHANGE_LAST_WRITE, fsp->fsp_name->base_name);
 851
 852         return true;
 853 }
 854
 855 /******************************************************************
 856  Set a create time EA.
 857 ******************************************************************/
 858
 859 NTSTATUS set_create_timespec_ea(connection_struct *conn,
 860                                 struct files_struct *fsp,
 861                                 const struct smb_filename *smb_fname,
 862                                 struct timespec create_time)
 863 {
 864         int ret;
 865         char buf[8];
 866
 867         if (!lp_store_create_time(SNUM(conn))) {
 868                 return NT_STATUS_OK;
 869         }
 870
 871         put_long_date_timespec(conn->ts_res, buf, create_time);
 872         if (fsp && fsp->fh->fd != -1) {
 873                 ret = SMB_VFS_FSETXATTR(fsp,
 874                                 SAMBA_XATTR_DOSTIMESTAMPS,
 875                                 buf,
 876                                 sizeof(buf),
 877                                 0);
 878         } else {
 879                 ret = SMB_VFS_SETXATTR(conn,
 880                                 smb_fname->base_name,
 881                                 SAMBA_XATTR_DOSTIMESTAMPS,
 882                                 buf,
 883                                 sizeof(buf),
 884                                 0);
 885         }
 886
 887         if (ret == -1) {
 888                 map_nt_error_from_unix(errno);
 889         }
 890         DEBUG(10,("set_create_timespec_ea: wrote create time EA for file %s\n",
 891                 smb_fname_str_dbg(smb_fname)));
 892         return NT_STATUS_OK;
 893 }
 894
 895 /******************************************************************
 896  Returns an EA create timespec, or a zero timespec if fail.
 897 ******************************************************************/
 898
 899 static struct timespec get_create_timespec_ea(connection_struct *conn,
 900                                 struct files_struct *fsp,
 901                                 const struct smb_filename *smb_fname)
 902 {
 903         ssize_t ret;
 904         char buf[8];
 905         struct timespec ts;
 906
 907         ZERO_STRUCT(ts);
 908
 909         if (!lp_store_create_time(SNUM(conn))) {
 910                 return ts;
 911         }
 912
 913         if (fsp && fsp->fh->fd != -1) {
 914                 ret = SMB_VFS_FGETXATTR(fsp,
 915                                 SAMBA_XATTR_DOSTIMESTAMPS,
 916                                 buf,
 917                                 sizeof(buf));
 918         } else {
 919                 ret = SMB_VFS_GETXATTR(conn,
 920                                 smb_fname->base_name,
 921                                 SAMBA_XATTR_DOSTIMESTAMPS,
 922                                 buf,
 923                                 sizeof(buf));
 924         }
 925         if (ret == sizeof(buf)) {
 926                 return interpret_long_date(buf);
 927         } else {
 928                 return ts;
 929         }
 930 }
 931
 932 /******************************************************************
 933  Return a create time - looks at EA.
 934 ******************************************************************/
 935
 936 struct timespec get_create_timespec(connection_struct *conn,
 937                                 struct files_struct *fsp,
 938                                 const struct smb_filename *smb_fname)
 939 {
 940         struct timespec ts = get_create_timespec_ea(conn, fsp, smb_fname);
 941
 942         if (!null_timespec(ts)) {
 943                 return ts;
 944         } else {
 945                 return smb_fname->st.st_ex_btime;
 946         }
 947 }
 948
 949 /******************************************************************
 950  Return a change time (may look at EA in future).
 951 ******************************************************************/
 952
 953 struct timespec get_change_timespec(connection_struct *conn,
 954                                 struct files_struct *fsp,
 955                                 const struct smb_filename *smb_fname)
 956 {
 957         return smb_fname->st.st_ex_mtime;
 958 }