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 #include "librpc/gen_ndr/ndr_xattr.h"
  23
  24 static uint32_t filter_mode_by_protocol(uint32_t mode)
  25 {
  26         if (get_Protocol() <= PROTOCOL_LANMAN2) {
  27                 DEBUG(10,("filter_mode_by_protocol: "
  28                         "filtering result 0x%x to 0x%x\n",
  29                         (unsigned int)mode,
  30                         (unsigned int)(mode & 0x3f) ));
  31                 mode &= 0x3f;
  32         }
  33         return mode;
  34 }
  35
  36 static int set_sparse_flag(const SMB_STRUCT_STAT * const sbuf)
  37 {
  38 #if defined (HAVE_STAT_ST_BLOCKS) && defined(STAT_ST_BLOCKSIZE)
  39         if (sbuf->st_ex_size > sbuf->st_ex_blocks * (SMB_OFF_T)STAT_ST_BLOCKSIZE) {
  40                 return FILE_ATTRIBUTE_SPARSE;
  41         }
  42 #endif
  43         return 0;
  44 }
  45
  46 static int set_link_read_only_flag(const SMB_STRUCT_STAT *const sbuf)
  47 {
  48 #ifdef S_ISLNK
  49 #if LINKS_READ_ONLY
  50         if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
  51                 return aRONLY;
  52 #endif
  53 #endif
  54         return 0;
  55 }
  56
  57 /****************************************************************************
  58  Change a dos mode to a unix mode.
  59     Base permission for files:
  60          if creating file and inheriting (i.e. parent_dir != NULL)
  61            apply read/write bits from parent directory.
  62          else
  63            everybody gets read bit set
  64          dos readonly is represented in unix by removing everyone's write bit
  65          dos archive is represented in unix by the user's execute bit
  66          dos system is represented in unix by the group's execute bit
  67          dos hidden is represented in unix by the other's execute bit
  68          if !inheriting {
  69            Then apply create mask,
  70            then add force bits.
  71          }
  72     Base permission for directories:
  73          dos directory is represented in unix by unix's dir bit and the exec bit
  74          if !inheriting {
  75            Then apply create mask,
  76            then add force bits.
  77          }
  78 ****************************************************************************/
  79
  80 mode_t unix_mode(connection_struct *conn, int dosmode,
  81                  const struct smb_filename *smb_fname,
  82                  const char *inherit_from_dir)
  83 {
  84         mode_t result = (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
  85         mode_t dir_mode = 0; /* Mode of the inherit_from directory if
  86                               * inheriting. */
  87
  88         if (!lp_store_dos_attributes(SNUM(conn)) && IS_DOS_READONLY(dosmode)) {
  89                 result &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
  90         }
  91
  92         if ((inherit_from_dir != NULL) && lp_inherit_perms(SNUM(conn))) {
  93                 struct smb_filename *smb_fname_parent = NULL;
  94                 NTSTATUS status;
  95
  96                 DEBUG(2, ("unix_mode(%s) inheriting from %s\n",
  97                           smb_fname_str_dbg(smb_fname),
  98                           inherit_from_dir));
  99
 100                 status = create_synthetic_smb_fname(talloc_tos(),
 101                                                     inherit_from_dir, NULL,
 102                                                     NULL, &smb_fname_parent);
 103                 if (!NT_STATUS_IS_OK(status)) {
 104                         DEBUG(1,("unix_mode(%s) failed, [dir %s]: %s\n",
 105                                  smb_fname_str_dbg(smb_fname),
 106                                  inherit_from_dir, nt_errstr(status)));
 107                         return(0);
 108                 }
 109
 110                 if (SMB_VFS_STAT(conn, smb_fname_parent) != 0) {
 111                         DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",
 112                                  smb_fname_str_dbg(smb_fname),
 113                                  inherit_from_dir, strerror(errno)));
 114                         TALLOC_FREE(smb_fname_parent);
 115                         return(0);      /* *** shouldn't happen! *** */
 116                 }
 117
 118                 /* Save for later - but explicitly remove setuid bit for safety. */
 119                 dir_mode = smb_fname_parent->st.st_ex_mode & ~S_ISUID;
 120                 DEBUG(2,("unix_mode(%s) inherit mode %o\n",
 121                          smb_fname_str_dbg(smb_fname), (int)dir_mode));
 122                 /* Clear "result" */
 123                 result = 0;
 124                 TALLOC_FREE(smb_fname_parent);
 125         }
 126
 127         if (IS_DOS_DIR(dosmode)) {
 128                 /* We never make directories read only for the owner as under DOS a user
 129                 can always create a file in a read-only directory. */
 130                 result |= (S_IFDIR | S_IWUSR);
 131
 132                 if (dir_mode) {
 133                         /* Inherit mode of parent directory. */
 134                         result |= dir_mode;
 135                 } else {
 136                         /* Provisionally add all 'x' bits */
 137                         result |= (S_IXUSR | S_IXGRP | S_IXOTH);
 138
 139                         /* Apply directory mask */
 140                         result &= lp_dir_mask(SNUM(conn));
 141                         /* Add in force bits */
 142                         result |= lp_force_dir_mode(SNUM(conn));
 143                 }
 144         } else {
 145                 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
 146                         result |= S_IXUSR;
 147
 148                 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
 149                         result |= S_IXGRP;
 150
 151                 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
 152                         result |= S_IXOTH;
 153
 154                 if (dir_mode) {
 155                         /* Inherit 666 component of parent directory mode */
 156                         result |= dir_mode & (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
 157                 } else {
 158                         /* Apply mode mask */
 159                         result &= lp_create_mask(SNUM(conn));
 160                         /* Add in force bits */
 161                         result |= lp_force_create_mode(SNUM(conn));
 162                 }
 163         }
 164
 165         DEBUG(3,("unix_mode(%s) returning 0%o\n", smb_fname_str_dbg(smb_fname),
 166                  (int)result));
 167         return(result);
 168 }
 169
 170 /****************************************************************************
 171  Change a unix mode to a dos mode.
 172 ****************************************************************************/
 173
 174 static uint32 dos_mode_from_sbuf(connection_struct *conn,
 175                                  const struct smb_filename *smb_fname)
 176 {
 177         int result = 0;
 178         enum mapreadonly_options ro_opts = (enum mapreadonly_options)lp_map_readonly(SNUM(conn));
 179
 180         if (ro_opts == MAP_READONLY_YES) {
 181                 /* Original Samba method - map inverse of user "w" bit. */
 182                 if ((smb_fname->st.st_ex_mode & S_IWUSR) == 0) {
 183                         result |= aRONLY;
 184                 }
 185         } else if (ro_opts == MAP_READONLY_PERMISSIONS) {
 186                 /* Check actual permissions for read-only. */
 187                 if (!can_write_to_file(conn, smb_fname)) {
 188                         result |= aRONLY;
 189                 }
 190         } /* Else never set the readonly bit. */
 191
 192         if (MAP_ARCHIVE(conn) && ((smb_fname->st.st_ex_mode & S_IXUSR) != 0))
 193                 result |= aARCH;
 194
 195         if (MAP_SYSTEM(conn) && ((smb_fname->st.st_ex_mode & S_IXGRP) != 0))
 196                 result |= aSYSTEM;
 197
 198         if (MAP_HIDDEN(conn) && ((smb_fname->st.st_ex_mode & S_IXOTH) != 0))
 199                 result |= aHIDDEN;
 200
 201         if (S_ISDIR(smb_fname->st.st_ex_mode))
 202                 result = aDIR | (result & aRONLY);
 203
 204         result |= set_sparse_flag(&smb_fname->st);
 205         result |= set_link_read_only_flag(&smb_fname->st);
 206
 207         DEBUG(8,("dos_mode_from_sbuf returning "));
 208
 209         if (result & aHIDDEN) DEBUG(8, ("h"));
 210         if (result & aRONLY ) DEBUG(8, ("r"));
 211         if (result & aSYSTEM) DEBUG(8, ("s"));
 212         if (result & aDIR   ) DEBUG(8, ("d"));
 213         if (result & aARCH  ) DEBUG(8, ("a"));
 214
 215         DEBUG(8,("\n"));
 216         return result;
 217 }
 218
 219 /****************************************************************************
 220  Get DOS attributes from an EA.
 221  This can also pull the create time into the stat struct inside smb_fname.
 222 ****************************************************************************/
 223
 224 static bool get_ea_dos_attribute(connection_struct *conn,
 225                                  struct smb_filename *smb_fname,
 226                                  uint32 *pattr)
 227 {
 228         struct xattr_DOSATTRIB dosattrib;
 229         enum ndr_err_code ndr_err;
 230         DATA_BLOB blob;
 231         ssize_t sizeret;
 232         fstring attrstr;
 233         uint32_t dosattr;
 234
 235         if (!lp_store_dos_attributes(SNUM(conn))) {
 236                 return False;
 237         }
 238
 239         /* Don't reset pattr to zero as we may already have filename-based attributes we
 240            need to preserve. */
 241
 242         sizeret = SMB_VFS_GETXATTR(conn, smb_fname->base_name,
 243                                    SAMBA_XATTR_DOS_ATTRIB, attrstr,
 244                                    sizeof(attrstr));
 245         if (sizeret == -1) {
 246                 if (errno == ENOSYS
 247 #if defined(ENOTSUP)
 248                         || errno == ENOTSUP) {
 249 #else
 250                                 ) {
 251 #endif
 252                         DEBUG(1,("get_ea_dos_attribute: Cannot get attribute "
 253                                  "from EA on file %s: Error = %s\n",
 254                                  smb_fname_str_dbg(smb_fname),
 255                                  strerror(errno)));
 256                         set_store_dos_attributes(SNUM(conn), False);
 257                 }
 258                 return False;
 259         }
 260
 261         blob.data = (uint8_t *)attrstr;
 262         blob.length = sizeret;
 263
 264         ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), &dosattrib,
 265                         (ndr_pull_flags_fn_t)ndr_pull_xattr_DOSATTRIB);
 266
 267         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 268                 DEBUG(1,("get_ea_dos_attribute: bad ndr decode "
 269                          "from EA on file %s: Error = %s\n",
 270                          smb_fname_str_dbg(smb_fname),
 271                          ndr_errstr(ndr_err)));
 272                 return false;
 273         }
 274
 275         DEBUG(10,("get_ea_dos_attribute: %s attr = %s\n",
 276                   smb_fname_str_dbg(smb_fname), dosattrib.attrib_hex));
 277
 278         switch (dosattrib.version) {
 279                 case 0xFFFF:
 280                         dosattr = dosattrib.info.compatinfoFFFF.attrib;
 281                         break;
 282                 case 1:
 283                         dosattr = dosattrib.info.info1.attrib;
 284                         if (!null_nttime(dosattrib.info.info1.create_time)) {
 285                                 struct timespec create_time =
 286                                         nt_time_to_unix_timespec(
 287                                                 &dosattrib.info.info1.create_time);
 288
 289                                 update_stat_ex_create_time(&smb_fname->st,
 290                                                         create_time);
 291
 292                                 DEBUG(10,("get_ea_dos_attribute: file %s case 1 "
 293                                         "set btime %s\n",
 294                                         smb_fname_str_dbg(smb_fname),
 295                                         time_to_asc(convert_timespec_to_time_t(
 296                                                 create_time)) ));
 297                         }
 298                         break;
 299                 case 2:
 300                         dosattr = dosattrib.info.oldinfo2.attrib;
 301                         /* Don't know what flags to check for this case. */
 302                         break;
 303                 case 3:
 304                         dosattr = dosattrib.info.info3.attrib;
 305                         if ((dosattrib.info.info3.valid_flags & XATTR_DOSINFO_CREATE_TIME) &&
 306                                         !null_nttime(dosattrib.info.info3.create_time)) {
 307                                 struct timespec create_time =
 308                                         nt_time_to_unix_timespec(
 309                                                 &dosattrib.info.info3.create_time);
 310
 311                                 update_stat_ex_create_time(&smb_fname->st,
 312                                                         create_time);
 313
 314                                 DEBUG(10,("get_ea_dos_attribute: file %s case 3 "
 315                                         "set btime %s\n",
 316                                         smb_fname_str_dbg(smb_fname),
 317                                         time_to_asc(convert_timespec_to_time_t(
 318                                                 create_time)) ));
 319                         }
 320                         break;
 321                         default:
 322                                 DEBUG(1,("get_ea_dos_attribute: Badly formed DOSATTRIB on "
 323                                          "file %s - %s\n", smb_fname_str_dbg(smb_fname),
 324                                          attrstr));
 325                         return false;
 326         }
 327
 328         if (S_ISDIR(smb_fname->st.st_ex_mode)) {
 329                 dosattr |= aDIR;
 330         }
 331         *pattr = (uint32)(dosattr & SAMBA_ATTRIBUTES_MASK);
 332
 333         DEBUG(8,("get_ea_dos_attribute returning (0x%x)", dosattr));
 334
 335         if (dosattr & aHIDDEN) DEBUG(8, ("h"));
 336         if (dosattr & aRONLY ) DEBUG(8, ("r"));
 337         if (dosattr & aSYSTEM) DEBUG(8, ("s"));
 338         if (dosattr & aDIR   ) DEBUG(8, ("d"));
 339         if (dosattr & aARCH  ) DEBUG(8, ("a"));
 340
 341         DEBUG(8,("\n"));
 342
 343         return True;
 344 }
 345
 346 /****************************************************************************
 347  Set DOS attributes in an EA.
 348  Also sets the create time.
 349 ****************************************************************************/
 350
 351 static bool set_ea_dos_attribute(connection_struct *conn,
 352                                  struct smb_filename *smb_fname,
 353                                  uint32 dosmode)
 354 {
 355         struct xattr_DOSATTRIB dosattrib;
 356         enum ndr_err_code ndr_err;
 357         DATA_BLOB blob;
 358         files_struct *fsp = NULL;
 359         bool ret = false;
 360
 361         if (!lp_store_dos_attributes(SNUM(conn))) {
 362                 return False;
 363         }
 364
 365         ZERO_STRUCT(dosattrib);
 366         ZERO_STRUCT(blob);
 367
 368         dosattrib.version = 3;
 369         dosattrib.info.info3.valid_flags = XATTR_DOSINFO_ATTRIB|
 370                                         XATTR_DOSINFO_CREATE_TIME;
 371         dosattrib.info.info3.attrib = dosmode;
 372         unix_timespec_to_nt_time(&dosattrib.info.info3.create_time,
 373                                 smb_fname->st.st_ex_btime);
 374
 375         DEBUG(10,("set_ea_dos_attributes: set attribute 0x%x, btime = %s on file %s\n",
 376                 (unsigned int)dosmode,
 377                 time_to_asc(convert_timespec_to_time_t(smb_fname->st.st_ex_btime)),
 378                 smb_fname_str_dbg(smb_fname) ));
 379
 380         ndr_err = ndr_push_struct_blob(
 381                         &blob, talloc_tos(), &dosattrib,
 382                         (ndr_push_flags_fn_t)ndr_push_xattr_DOSATTRIB);
 383
 384         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 385                 DEBUG(5, ("create_acl_blob: ndr_push_xattr_DOSATTRIB failed: %s\n",
 386                         ndr_errstr(ndr_err)));
 387                 return false;
 388         }
 389
 390         if (blob.data == NULL || blob.length == 0) {
 391                 return false;
 392         }
 393
 394         if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
 395                              SAMBA_XATTR_DOS_ATTRIB, blob.data, blob.length,
 396                              0) == -1) {
 397                 if((errno != EPERM) && (errno != EACCES)) {
 398                         if (errno == ENOSYS
 399 #if defined(ENOTSUP)
 400                                 || errno == ENOTSUP) {
 401 #else
 402                                 ) {
 403 #endif
 404                                 DEBUG(1,("set_ea_dos_attributes: Cannot set "
 405                                          "attribute EA on file %s: Error = %s\n",
 406                                          smb_fname_str_dbg(smb_fname),
 407                                          strerror(errno) ));
 408                                 set_store_dos_attributes(SNUM(conn), False);
 409                         }
 410                         return false;
 411                 }
 412
 413                 /* We want DOS semantics, ie allow non owner with write permission to change the
 414                         bits on a file. Just like file_ntimes below.
 415                 */
 416
 417                 /* Check if we have write access. */
 418                 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
 419                         return false;
 420
 421                 /*
 422                  * We need to open the file with write access whilst
 423                  * still in our current user context. This ensures we
 424                  * are not violating security in doing the setxattr.
 425                  */
 426
 427                 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname,
 428                                                       &fsp)))
 429                         return ret;
 430                 become_root();
 431                 if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
 432                                      SAMBA_XATTR_DOS_ATTRIB, blob.data,
 433                                      blob.length, 0) == 0) {
 434                         ret = true;
 435                 }
 436                 unbecome_root();
 437                 close_file_fchmod(NULL, fsp);
 438                 return ret;
 439         }
 440         DEBUG(10,("set_ea_dos_attribute: set EA 0x%x on file %s\n",
 441                 (unsigned int)dosmode,
 442                 smb_fname_str_dbg(smb_fname)));
 443         return true;
 444 }
 445
 446 /****************************************************************************
 447  Change a unix mode to a dos mode for an ms dfs link.
 448 ****************************************************************************/
 449
 450 uint32 dos_mode_msdfs(connection_struct *conn,
 451                       const struct smb_filename *smb_fname)
 452 {
 453         uint32 result = 0;
 454
 455         DEBUG(8,("dos_mode_msdfs: %s\n", smb_fname_str_dbg(smb_fname)));
 456
 457         if (!VALID_STAT(smb_fname->st)) {
 458                 return 0;
 459         }
 460
 461         /* First do any modifications that depend on the path name. */
 462         /* hide files with a name starting with a . */
 463         if (lp_hide_dot_files(SNUM(conn))) {
 464                 const char *p = strrchr_m(smb_fname->base_name, '/');
 465                 if (p) {
 466                         p++;
 467                 } else {
 468                         p = smb_fname->base_name;
 469                 }
 470
 471                 /* Only . and .. are not hidden. */
 472                 if (p[0] == '.' && !((p[1] == '\0') ||
 473                                 (p[1] == '.' && p[2] == '\0'))) {
 474                         result |= aHIDDEN;
 475                 }
 476         }
 477
 478         result |= dos_mode_from_sbuf(conn, smb_fname);
 479
 480         /* Optimization : Only call is_hidden_path if it's not already
 481            hidden. */
 482         if (!(result & aHIDDEN) &&
 483             IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
 484                 result |= aHIDDEN;
 485         }
 486
 487         if (result == 0) {
 488                 result = FILE_ATTRIBUTE_NORMAL;
 489         }
 490
 491         result = filter_mode_by_protocol(result);
 492
 493         DEBUG(8,("dos_mode_msdfs returning "));
 494
 495         if (result & aHIDDEN) DEBUG(8, ("h"));
 496         if (result & aRONLY ) DEBUG(8, ("r"));
 497         if (result & aSYSTEM) DEBUG(8, ("s"));
 498         if (result & aDIR   ) DEBUG(8, ("d"));
 499         if (result & aARCH  ) DEBUG(8, ("a"));
 500         if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
 501
 502         DEBUG(8,("\n"));
 503
 504         return(result);
 505 }
 506
 507 #ifdef HAVE_STAT_DOS_FLAGS
 508 /****************************************************************************
 509  Convert dos attributes (FILE_ATTRIBUTE_*) to dos stat flags (UF_*)
 510 ****************************************************************************/
 511
 512 int dos_attributes_to_stat_dos_flags(uint32_t dosmode)
 513 {
 514         uint32_t dos_stat_flags = 0;
 515
 516         if (dosmode & aARCH)
 517                 dos_stat_flags |= UF_DOS_ARCHIVE;
 518         if (dosmode & aHIDDEN)
 519                 dos_stat_flags |= UF_DOS_HIDDEN;
 520         if (dosmode & aRONLY)
 521                 dos_stat_flags |= UF_DOS_RO;
 522         if (dosmode & aSYSTEM)
 523                 dos_stat_flags |= UF_DOS_SYSTEM;
 524         if (dosmode & FILE_ATTRIBUTE_NONINDEXED)
 525                 dos_stat_flags |= UF_DOS_NOINDEX;
 526
 527         return dos_stat_flags;
 528 }
 529
 530 /****************************************************************************
 531  Gets DOS attributes, accessed via st_ex_flags in the stat struct.
 532 ****************************************************************************/
 533
 534 static bool get_stat_dos_flags(connection_struct *conn,
 535                                const struct smb_filename *smb_fname,
 536                                uint32_t *dosmode)
 537 {
 538         SMB_ASSERT(VALID_STAT(smb_fname->st));
 539         SMB_ASSERT(dosmode);
 540
 541         if (!lp_store_dos_attributes(SNUM(conn))) {
 542                 return false;
 543         }
 544
 545         DEBUG(5, ("Getting stat dos attributes for %s.\n",
 546                   smb_fname_str_dbg(smb_fname)));
 547
 548         if (smb_fname->st.st_ex_flags & UF_DOS_ARCHIVE)
 549                 *dosmode |= aARCH;
 550         if (smb_fname->st.st_ex_flags & UF_DOS_HIDDEN)
 551                 *dosmode |= aHIDDEN;
 552         if (smb_fname->st.st_ex_flags & UF_DOS_RO)
 553                 *dosmode |= aRONLY;
 554         if (smb_fname->st.st_ex_flags & UF_DOS_SYSTEM)
 555                 *dosmode |= aSYSTEM;
 556         if (smb_fname->st.st_ex_flags & UF_DOS_NOINDEX)
 557                 *dosmode |= FILE_ATTRIBUTE_NONINDEXED;
 558         if (smb_fname->st.st_ex_flags & FILE_ATTRIBUTE_SPARSE)
 559                 *dosmode |= FILE_ATTRIBUTE_SPARSE;
 560         if (S_ISDIR(smb_fname->st.st_ex_mode))
 561                 *dosmode |= aDIR;
 562
 563         *dosmode |= set_sparse_flag(&smb_fname->st);
 564         *dosmode |= set_link_read_only_flag(&smb_fname->st);
 565
 566         return true;
 567 }
 568
 569 /****************************************************************************
 570  Sets DOS attributes, stored in st_ex_flags of the inode.
 571 ****************************************************************************/
 572
 573 static bool set_stat_dos_flags(connection_struct *conn,
 574                                const struct smb_filename *smb_fname,
 575                                uint32_t dosmode,
 576                                bool *attributes_changed)
 577 {
 578         uint32_t new_flags = 0;
 579         int error = 0;
 580
 581         SMB_ASSERT(VALID_STAT(smb_fname->st));
 582         SMB_ASSERT(attributes_changed);
 583
 584         *attributes_changed = false;
 585
 586         if (!lp_store_dos_attributes(SNUM(conn))) {
 587                 return false;
 588         }
 589
 590         DEBUG(5, ("Setting stat dos attributes for %s.\n",
 591                   smb_fname_str_dbg(smb_fname)));
 592
 593         new_flags = (smb_fname->st.st_ex_flags & ~UF_DOS_FLAGS) |
 594                      dos_attributes_to_stat_dos_flags(dosmode);
 595
 596         /* Return early if no flags changed. */
 597         if (new_flags == smb_fname->st.st_ex_flags)
 598                 return true;
 599
 600         DEBUG(5, ("Setting stat dos attributes=0x%x, prev=0x%x\n", new_flags,
 601                   smb_fname->st.st_ex_flags));
 602
 603         /* Set new flags with chflags. */
 604         error = SMB_VFS_CHFLAGS(conn, smb_fname->base_name, new_flags);
 605         if (error) {
 606                 DEBUG(0, ("Failed setting new stat dos attributes (0x%x) on "
 607                           "file %s! errno=%d\n", new_flags,
 608                           smb_fname_str_dbg(smb_fname), errno));
 609                 return false;
 610         }
 611
 612         *attributes_changed = true;
 613         return true;
 614 }
 615 #endif /* HAVE_STAT_DOS_FLAGS */
 616
 617 /****************************************************************************
 618  Change a unix mode to a dos mode.
 619  May also read the create timespec into the stat struct in smb_fname
 620  if "store dos attributes" is true.
 621 ****************************************************************************/
 622
 623 uint32 dos_mode(connection_struct *conn, struct smb_filename *smb_fname)
 624 {
 625         uint32 result = 0;
 626         bool offline, used_stat_dos_flags = false;
 627
 628         DEBUG(8,("dos_mode: %s\n", smb_fname_str_dbg(smb_fname)));
 629
 630         if (!VALID_STAT(smb_fname->st)) {
 631                 return 0;
 632         }
 633
 634         /* First do any modifications that depend on the path name. */
 635         /* hide files with a name starting with a . */
 636         if (lp_hide_dot_files(SNUM(conn))) {
 637                 const char *p = strrchr_m(smb_fname->base_name,'/');
 638                 if (p) {
 639                         p++;
 640                 } else {
 641                         p = smb_fname->base_name;
 642                 }
 643
 644                 /* Only . and .. are not hidden. */
 645                 if (p[0] == '.' && !((p[1] == '\0') ||
 646                                 (p[1] == '.' && p[2] == '\0'))) {
 647                         result |= aHIDDEN;
 648                 }
 649         }
 650
 651 #ifdef HAVE_STAT_DOS_FLAGS
 652         used_stat_dos_flags = get_stat_dos_flags(conn, smb_fname, &result);
 653 #endif
 654         if (!used_stat_dos_flags) {
 655                 /* Get the DOS attributes from an EA by preference. */
 656                 if (get_ea_dos_attribute(conn, smb_fname, &result)) {
 657                         result |= set_sparse_flag(&smb_fname->st);
 658                 } else {
 659                         result |= dos_mode_from_sbuf(conn, smb_fname);
 660                 }
 661         }
 662
 663         offline = SMB_VFS_IS_OFFLINE(conn, smb_fname->base_name, &smb_fname->st);
 664         if (S_ISREG(smb_fname->st.st_ex_mode) && offline) {
 665                 result |= FILE_ATTRIBUTE_OFFLINE;
 666         }
 667
 668         /* Optimization : Only call is_hidden_path if it's not already
 669            hidden. */
 670         if (!(result & aHIDDEN) &&
 671             IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
 672                 result |= aHIDDEN;
 673         }
 674
 675         if (result == 0) {
 676                 result = FILE_ATTRIBUTE_NORMAL;
 677         }
 678
 679         result = filter_mode_by_protocol(result);
 680
 681         DEBUG(8,("dos_mode returning "));
 682
 683         if (result & aHIDDEN) DEBUG(8, ("h"));
 684         if (result & aRONLY ) DEBUG(8, ("r"));
 685         if (result & aSYSTEM) DEBUG(8, ("s"));
 686         if (result & aDIR   ) DEBUG(8, ("d"));
 687         if (result & aARCH  ) DEBUG(8, ("a"));
 688         if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
 689
 690         DEBUG(8,("\n"));
 691
 692         return(result);
 693 }
 694
 695 /*******************************************************************
 696  chmod a file - but preserve some bits.
 697  If "store dos attributes" is also set it will store the create time
 698  from the stat struct in smb_fname (in NTTIME format) in the EA
 699  attribute also.
 700 ********************************************************************/
 701
 702 int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
 703                      uint32 dosmode, const char *parent_dir, bool newfile)
 704 {
 705         int mask=0;
 706         mode_t tmp;
 707         mode_t unixmode;
 708         int ret = -1, lret = -1;
 709         uint32_t old_mode;
 710         struct timespec new_create_timespec;
 711
 712         /* We only allow READONLY|HIDDEN|SYSTEM|DIRECTORY|ARCHIVE here. */
 713         dosmode &= (SAMBA_ATTRIBUTES_MASK | FILE_ATTRIBUTE_OFFLINE);
 714
 715         DEBUG(10,("file_set_dosmode: setting dos mode 0x%x on file %s\n",
 716                   dosmode, smb_fname_str_dbg(smb_fname)));
 717
 718         unixmode = smb_fname->st.st_ex_mode;
 719
 720         get_acl_group_bits(conn, smb_fname->base_name,
 721                            &smb_fname->st.st_ex_mode);
 722
 723         if (S_ISDIR(smb_fname->st.st_ex_mode))
 724                 dosmode |= aDIR;
 725         else
 726                 dosmode &= ~aDIR;
 727
 728         new_create_timespec = smb_fname->st.st_ex_btime;
 729
 730         old_mode = dos_mode(conn, smb_fname);
 731
 732         if (dosmode & FILE_ATTRIBUTE_OFFLINE) {
 733                 if (!(old_mode & FILE_ATTRIBUTE_OFFLINE)) {
 734                         lret = SMB_VFS_SET_OFFLINE(conn, smb_fname->base_name);
 735                         if (lret == -1) {
 736                                 DEBUG(0, ("set_dos_mode: client has asked to "
 737                                           "set FILE_ATTRIBUTE_OFFLINE to "
 738                                           "%s/%s but there was an error while "
 739                                           "setting it or it is not "
 740                                           "supported.\n", parent_dir,
 741                                           smb_fname_str_dbg(smb_fname)));
 742                         }
 743                 }
 744         }
 745
 746         dosmode  &= ~FILE_ATTRIBUTE_OFFLINE;
 747         old_mode &= ~FILE_ATTRIBUTE_OFFLINE;
 748
 749         smb_fname->st.st_ex_btime = new_create_timespec;
 750
 751 #ifdef HAVE_STAT_DOS_FLAGS
 752         {
 753                 bool attributes_changed;
 754
 755                 if (set_stat_dos_flags(conn, smb_fname, dosmode,
 756                                        &attributes_changed))
 757                 {
 758                         if (!newfile && attributes_changed) {
 759                                 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 760                                     FILE_NOTIFY_CHANGE_ATTRIBUTES,
 761                                     smb_fname->base_name);
 762                         }
 763                         smb_fname->st.st_ex_mode = unixmode;
 764                         return 0;
 765                 }
 766         }
 767 #endif
 768         /* Store the DOS attributes in an EA by preference. */
 769         if (set_ea_dos_attribute(conn, smb_fname, dosmode)) {
 770                 if (!newfile) {
 771                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 772                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 773                                      smb_fname->base_name);
 774                 }
 775                 smb_fname->st.st_ex_mode = unixmode;
 776                 return 0;
 777         }
 778
 779         unixmode = unix_mode(conn, dosmode, smb_fname, parent_dir);
 780
 781         /* preserve the s bits */
 782         mask |= (S_ISUID | S_ISGID);
 783
 784         /* preserve the t bit */
 785 #ifdef S_ISVTX
 786         mask |= S_ISVTX;
 787 #endif
 788
 789         /* possibly preserve the x bits */
 790         if (!MAP_ARCHIVE(conn))
 791                 mask |= S_IXUSR;
 792         if (!MAP_SYSTEM(conn))
 793                 mask |= S_IXGRP;
 794         if (!MAP_HIDDEN(conn))
 795                 mask |= S_IXOTH;
 796
 797         unixmode |= (smb_fname->st.st_ex_mode & mask);
 798
 799         /* if we previously had any r bits set then leave them alone */
 800         if ((tmp = smb_fname->st.st_ex_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
 801                 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
 802                 unixmode |= tmp;
 803         }
 804
 805         /* if we previously had any w bits set then leave them alone
 806                 whilst adding in the new w bits, if the new mode is not rdonly */
 807         if (!IS_DOS_READONLY(dosmode)) {
 808                 unixmode |= (smb_fname->st.st_ex_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
 809         }
 810
 811         ret = SMB_VFS_CHMOD(conn, smb_fname->base_name, unixmode);
 812         if (ret == 0) {
 813                 if(!newfile || (lret != -1)) {
 814                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 815                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 816                                      smb_fname->base_name);
 817                 }
 818                 smb_fname->st.st_ex_mode = unixmode;
 819                 return 0;
 820         }
 821
 822         if((errno != EPERM) && (errno != EACCES))
 823                 return -1;
 824
 825         if(!lp_dos_filemode(SNUM(conn)))
 826                 return -1;
 827
 828         /* We want DOS semantics, ie allow non owner with write permission to change the
 829                 bits on a file. Just like file_ntimes below.
 830         */
 831
 832         /* Check if we have write access. */
 833         if (CAN_WRITE(conn)) {
 834                 /*
 835                  * We need to open the file with write access whilst
 836                  * still in our current user context. This ensures we
 837                  * are not violating security in doing the fchmod.
 838                  * This file open does *not* break any oplocks we are
 839                  * holding. We need to review this.... may need to
 840                  * break batch oplocks open by others. JRA.
 841                  */
 842                 files_struct *fsp;
 843                 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname,
 844                                      &fsp)))
 845                         return -1;
 846                 become_root();
 847                 ret = SMB_VFS_FCHMOD(fsp, unixmode);
 848                 unbecome_root();
 849                 close_file_fchmod(NULL, fsp);
 850                 if (!newfile) {
 851                         notify_fname(conn, NOTIFY_ACTION_MODIFIED,
 852                                      FILE_NOTIFY_CHANGE_ATTRIBUTES,
 853                                      smb_fname->base_name);
 854                 }
 855                 if (ret == 0) {
 856                         smb_fname->st.st_ex_mode = unixmode;
 857                 }
 858         }
 859
 860         return( ret );
 861 }
 862
 863 /*******************************************************************
 864  Wrapper around the VFS ntimes that possibly allows DOS semantics rather
 865  than POSIX.
 866 *******************************************************************/
 867
 868 int file_ntimes(connection_struct *conn, const struct smb_filename *smb_fname,
 869                 struct smb_file_time *ft)
 870 {
 871         int ret = -1;
 872
 873         errno = 0;
 874
 875         DEBUG(6, ("file_ntime: actime: %s",
 876                   time_to_asc(convert_timespec_to_time_t(ft->atime))));
 877         DEBUG(6, ("file_ntime: modtime: %s",
 878                   time_to_asc(convert_timespec_to_time_t(ft->mtime))));
 879         DEBUG(6, ("file_ntime: ctime: %s",
 880                   time_to_asc(convert_timespec_to_time_t(ft->ctime))));
 881         DEBUG(6, ("file_ntime: createtime: %s",
 882                   time_to_asc(convert_timespec_to_time_t(ft->create_time))));
 883
 884         /* Don't update the time on read-only shares */
 885         /* We need this as set_filetime (which can be called on
 886            close and other paths) can end up calling this function
 887            without the NEED_WRITE protection. Found by :
 888            Leo Weppelman <leo@wau.mis.ah.nl>
 889         */
 890
 891         if (!CAN_WRITE(conn)) {
 892                 return 0;
 893         }
 894
 895         if(SMB_VFS_NTIMES(conn, smb_fname, ft) == 0) {
 896                 return 0;
 897         }
 898
 899         if((errno != EPERM) && (errno != EACCES)) {
 900                 return -1;
 901         }
 902
 903         if(!lp_dos_filetimes(SNUM(conn))) {
 904                 return -1;
 905         }
 906
 907         /* We have permission (given by the Samba admin) to
 908            break POSIX semantics and allow a user to change
 909            the time on a file they don't own but can write to
 910            (as DOS does).
 911          */
 912
 913         /* Check if we have write access. */
 914         if (can_write_to_file(conn, smb_fname)) {
 915                 /* We are allowed to become root and change the filetime. */
 916                 become_root();
 917                 ret = SMB_VFS_NTIMES(conn, smb_fname, ft);
 918                 unbecome_root();
 919         }
 920
 921         return ret;
 922 }
 923
 924 /******************************************************************
 925  Force a "sticky" write time on a pathname. This will always be
 926  returned on all future write time queries and set on close.
 927 ******************************************************************/
 928
 929 bool set_sticky_write_time_path(struct file_id fileid, struct timespec mtime)
 930 {
 931         if (null_timespec(mtime)) {
 932                 return true;
 933         }
 934
 935         if (!set_sticky_write_time(fileid, mtime)) {
 936                 return false;
 937         }
 938
 939         return true;
 940 }
 941
 942 /******************************************************************
 943  Force a "sticky" write time on an fsp. This will always be
 944  returned on all future write time queries and set on close.
 945 ******************************************************************/
 946
 947 bool set_sticky_write_time_fsp(struct files_struct *fsp, struct timespec mtime)
 948 {
 949         if (null_timespec(mtime)) {
 950                 return true;
 951         }
 952
 953         fsp->write_time_forced = true;
 954         TALLOC_FREE(fsp->update_write_time_event);
 955
 956         return set_sticky_write_time_path(fsp->file_id, mtime);
 957 }
 958
 959 /******************************************************************
 960  Set a create time EA.
 961 ******************************************************************/
 962
 963 NTSTATUS set_create_timespec_ea(connection_struct *conn,
 964                                 const struct smb_filename *psmb_fname,
 965                                 struct timespec create_time)
 966 {
 967         NTSTATUS status;
 968         struct smb_filename *smb_fname = NULL;
 969         uint32_t dosmode;
 970         int ret;
 971
 972         if (!lp_store_dos_attributes(SNUM(conn))) {
 973                 return NT_STATUS_OK;
 974         }
 975
 976         status = create_synthetic_smb_fname(talloc_tos(),
 977                                 psmb_fname->base_name,
 978                                 NULL, &psmb_fname->st,
 979                                 &smb_fname);
 980
 981         if (!NT_STATUS_IS_OK(status)) {
 982                 return status;
 983         }
 984
 985         dosmode = dos_mode(conn, smb_fname);
 986
 987         smb_fname->st.st_ex_btime = create_time;
 988
 989         ret = file_set_dosmode(conn, smb_fname, dosmode, NULL, false);
 990         if (ret == -1) {
 991                 map_nt_error_from_unix(errno);
 992         }
 993
 994         DEBUG(10,("set_create_timespec_ea: wrote create time EA for file %s\n",
 995                 smb_fname_str_dbg(smb_fname)));
 996
 997         return NT_STATUS_OK;
 998 }
 999
1000 /******************************************************************
1001  Return a create time.
1002 ******************************************************************/
1003
1004 struct timespec get_create_timespec(connection_struct *conn,
1005                                 struct files_struct *fsp,
1006                                 const struct smb_filename *smb_fname)
1007 {
1008         return smb_fname->st.st_ex_btime;
1009 }
1010
1011 /******************************************************************
1012  Return a change time (may look at EA in future).
1013 ******************************************************************/
1014
1015 struct timespec get_change_timespec(connection_struct *conn,
1016                                 struct files_struct *fsp,
1017                                 const struct smb_filename *smb_fname)
1018 {
1019         return smb_fname->st.st_ex_mtime;
1020 }