source3/smbd/filename.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    filename handling routines
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 1999-2007
   6    Copyright (C) Ying Chen 2000
   7    Copyright (C) Volker Lendecke 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * New hash table stat cache code added by Ying Chen.
  25  */
  26
  27 #include "includes.h"
  28 #include "system/filesys.h"
  29 #include "fake_file.h"
  30 #include "smbd/smbd.h"
  31
  32 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
  33                                   connection_struct *conn,
  34                                   const char *orig_path,
  35                                   struct smb_filename *smb_fname);
  36
  37 /****************************************************************************
  38  Mangle the 2nd name and check if it is then equal to the first name.
  39 ****************************************************************************/
  40
  41 static bool mangled_equal(const char *name1,
  42                         const char *name2,
  43                         const struct share_params *p)
  44 {
  45         char mname[13];
  46
  47         if (!name_to_8_3(name2, mname, False, p)) {
  48                 return False;
  49         }
  50         return strequal(name1, mname);
  51 }
  52
  53 /****************************************************************************
  54  Cope with the differing wildcard and non-wildcard error cases.
  55 ****************************************************************************/
  56
  57 static NTSTATUS determine_path_error(const char *name,
  58                         bool allow_wcard_last_component)
  59 {
  60         const char *p;
  61
  62         if (!allow_wcard_last_component) {
  63                 /* Error code within a pathname. */
  64                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
  65         }
  66
  67         /* We're terminating here so we
  68          * can be a little slower and get
  69          * the error code right. Windows
  70          * treats the last part of the pathname
  71          * separately I think, so if the last
  72          * component is a wildcard then we treat
  73          * this ./ as "end of component" */
  74
  75         p = strchr(name, '/');
  76
  77         if (!p && (ms_has_wild(name) || ISDOT(name))) {
  78                 /* Error code at the end of a pathname. */
  79                 return NT_STATUS_OBJECT_NAME_INVALID;
  80         } else {
  81                 /* Error code within a pathname. */
  82                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
  83         }
  84 }
  85
  86 static NTSTATUS check_for_dot_component(const struct smb_filename *smb_fname)
  87 {
  88         /* Ensure we catch all names with in "/."
  89            this is disallowed under Windows and
  90            in POSIX they've already been removed. */
  91         const char *p = strstr(smb_fname->base_name, "/."); /*mb safe*/
  92         if (p) {
  93                 if (p[2] == '/') {
  94                         /* Error code within a pathname. */
  95                         return NT_STATUS_OBJECT_PATH_NOT_FOUND;
  96                 } else if (p[2] == '\0') {
  97                         /* Error code at the end of a pathname. */
  98                         return NT_STATUS_OBJECT_NAME_INVALID;
  99                 }
 100         }
 101         return NT_STATUS_OK;
 102 }
 103
 104 /****************************************************************************
 105  Optimization for common case where the missing part
 106  is in the last component and the client already
 107  sent the correct case.
 108  Returns NT_STATUS_OK to mean continue the tree walk
 109  (possibly with modified start pointer).
 110  Any other NT_STATUS_XXX error means terminate the path
 111  lookup here.
 112 ****************************************************************************/
 113
 114 static NTSTATUS check_parent_exists(TALLOC_CTX *ctx,
 115                                 connection_struct *conn,
 116                                 bool posix_pathnames,
 117                                 const struct smb_filename *smb_fname,
 118                                 char **pp_dirpath,
 119                                 char **pp_start)
 120 {
 121         struct smb_filename parent_fname;
 122         const char *last_component = NULL;
 123         NTSTATUS status;
 124         int ret;
 125
 126         ZERO_STRUCT(parent_fname);
 127         if (!parent_dirname(ctx, smb_fname->base_name,
 128                                 &parent_fname.base_name,
 129                                 &last_component)) {
 130                 return NT_STATUS_NO_MEMORY;
 131         }
 132
 133         /*
 134          * If there was no parent component in
 135          * smb_fname->base_name of the parent name
 136          * contained a wildcard then don't do this
 137          * optimization.
 138          */
 139         if ((smb_fname->base_name == last_component) ||
 140                         ms_has_wild(parent_fname.base_name)) {
 141                 return NT_STATUS_OK;
 142         }
 143
 144         if (posix_pathnames) {
 145                 ret = SMB_VFS_LSTAT(conn, &parent_fname);
 146         } else {
 147                 ret = SMB_VFS_STAT(conn, &parent_fname);
 148         }
 149
 150         /* If the parent stat failed, just continue
 151            with the normal tree walk. */
 152
 153         if (ret == -1) {
 154                 return NT_STATUS_OK;
 155         }
 156
 157         status = check_for_dot_component(&parent_fname);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 return status;
 160         }
 161
 162         /* Parent exists - set "start" to be the
 163          * last compnent to shorten the tree walk. */
 164
 165         /*
 166          * Safe to use CONST_DISCARD
 167          * here as last_component points
 168          * into our smb_fname->base_name.
 169          */
 170         *pp_start = CONST_DISCARD(char *,last_component);
 171
 172         /* Update dirpath. */
 173         TALLOC_FREE(*pp_dirpath);
 174         *pp_dirpath = talloc_strdup(ctx, parent_fname.base_name);
 175         if (!*pp_dirpath) {
 176                 return NT_STATUS_NO_MEMORY;
 177         }
 178
 179         DEBUG(5,("check_parent_exists: name "
 180                 "= %s, dirpath = %s, "
 181                 "start = %s\n",
 182                 smb_fname->base_name,
 183                 *pp_dirpath,
 184                 *pp_start));
 185
 186         return NT_STATUS_OK;
 187 }
 188
 189 /****************************************************************************
 190 This routine is called to convert names from the dos namespace to unix
 191 namespace. It needs to handle any case conversions, mangling, format changes,
 192 streams etc.
 193
 194 We assume that we have already done a chdir() to the right "root" directory
 195 for this service.
 196
 197 The function will return an NTSTATUS error if some part of the name except for
 198 the last part cannot be resolved, else NT_STATUS_OK.
 199
 200 Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we
 201 didn't get any fatal errors that should immediately terminate the calling SMB
 202 processing whilst resolving.
 203
 204 If the UCF_SAVE_LCOMP flag is passed in, then the unmodified last component
 205 of the pathname is set in smb_filename->original_lcomp.
 206
 207 If UCF_ALWAYS_ALLOW_WCARD_LCOMP is passed in, then a MS wildcard was detected
 208 and should be allowed in the last component of the path only.
 209
 210 If the orig_path was a stream, smb_filename->base_name will point to the base
 211 filename, and smb_filename->stream_name will point to the stream name.  If
 212 orig_path was not a stream, then smb_filename->stream_name will be NULL.
 213
 214 On exit from unix_convert, the smb_filename->st stat struct will be populated
 215 if the file exists and was found, if not this stat struct will be filled with
 216 zeros (and this can be detected by checking for nlinks = 0, which can never be
 217 true for any file).
 218 ****************************************************************************/
 219
 220 NTSTATUS unix_convert(TALLOC_CTX *ctx,
 221                       connection_struct *conn,
 222                       const char *orig_path,
 223                       struct smb_filename **smb_fname_out,
 224                       uint32_t ucf_flags)
 225 {
 226         struct smb_filename *smb_fname = NULL;
 227         char *start, *end;
 228         char *dirpath = NULL;
 229         char *stream = NULL;
 230         bool component_was_mangled = False;
 231         bool name_has_wildcard = False;
 232         bool posix_pathnames = false;
 233         bool allow_wcard_last_component =
 234             (ucf_flags & UCF_ALWAYS_ALLOW_WCARD_LCOMP);
 235         bool save_last_component = ucf_flags & UCF_SAVE_LCOMP;
 236         NTSTATUS status;
 237         int ret = -1;
 238
 239         *smb_fname_out = NULL;
 240
 241         smb_fname = talloc_zero(ctx, struct smb_filename);
 242         if (smb_fname == NULL) {
 243                 return NT_STATUS_NO_MEMORY;
 244         }
 245
 246         if (conn->printer) {
 247                 /* we don't ever use the filenames on a printer share as a
 248                         filename - so don't convert them */
 249                 if (!(smb_fname->base_name = talloc_strdup(smb_fname,
 250                                                            orig_path))) {
 251                         status = NT_STATUS_NO_MEMORY;
 252                         goto err;
 253                 }
 254                 goto done;
 255         }
 256
 257         DEBUG(5, ("unix_convert called on file \"%s\"\n", orig_path));
 258
 259         /*
 260          * Conversion to basic unix format is already done in
 261          * check_path_syntax().
 262          */
 263
 264         /*
 265          * Names must be relative to the root of the service - any leading /.
 266          * and trailing /'s should have been trimmed by check_path_syntax().
 267          */
 268
 269 #ifdef DEVELOPER
 270         SMB_ASSERT(*orig_path != '/');
 271 #endif
 272
 273         /*
 274          * If we trimmed down to a single '\0' character
 275          * then we should use the "." directory to avoid
 276          * searching the cache, but not if we are in a
 277          * printing share.
 278          * As we know this is valid we can return true here.
 279          */
 280
 281         if (!*orig_path) {
 282                 if (!(smb_fname->base_name = talloc_strdup(smb_fname, "."))) {
 283                         status = NT_STATUS_NO_MEMORY;
 284                         goto err;
 285                 }
 286                 if (SMB_VFS_STAT(conn, smb_fname) != 0) {
 287                         status = map_nt_error_from_unix(errno);
 288                         goto err;
 289                 }
 290                 DEBUG(5, ("conversion finished \"\" -> %s\n",
 291                           smb_fname->base_name));
 292                 goto done;
 293         }
 294
 295         if (orig_path[0] == '.' && (orig_path[1] == '/' ||
 296                                 orig_path[1] == '\0')) {
 297                 /* Start of pathname can't be "." only. */
 298                 if (orig_path[1] == '\0' || orig_path[2] == '\0') {
 299                         status = NT_STATUS_OBJECT_NAME_INVALID;
 300                 } else {
 301                         status =determine_path_error(&orig_path[2],
 302                             allow_wcard_last_component);
 303                 }
 304                 goto err;
 305         }
 306
 307         /* Start with the full orig_path as given by the caller. */
 308         if (!(smb_fname->base_name = talloc_strdup(smb_fname, orig_path))) {
 309                 DEBUG(0, ("talloc_strdup failed\n"));
 310                 status = NT_STATUS_NO_MEMORY;
 311                 goto err;
 312         }
 313
 314         /*
 315          * Large directory fix normalization. If we're case sensitive, and
 316          * the case preserving parameters are set to "no", normalize the case of
 317          * the incoming filename from the client WHETHER IT EXISTS OR NOT !
 318          * This is in conflict with the current (3.0.20) man page, but is
 319          * what people expect from the "large directory howto". I'll update
 320          * the man page. Thanks to jht@samba.org for finding this. JRA.
 321          */
 322
 323         if (conn->case_sensitive && !conn->case_preserve &&
 324                         !conn->short_case_preserve) {
 325                 strnorm(smb_fname->base_name, lp_defaultcase(SNUM(conn)));
 326         }
 327
 328         /*
 329          * Ensure saved_last_component is valid even if file exists.
 330          */
 331
 332         if(save_last_component) {
 333                 end = strrchr_m(smb_fname->base_name, '/');
 334                 if (end) {
 335                         smb_fname->original_lcomp = talloc_strdup(smb_fname,
 336                                                                   end + 1);
 337                 } else {
 338                         smb_fname->original_lcomp =
 339                             talloc_strdup(smb_fname, smb_fname->base_name);
 340                 }
 341                 if (smb_fname->original_lcomp == NULL) {
 342                         status = NT_STATUS_NO_MEMORY;
 343                         goto err;
 344                 }
 345         }
 346
 347         posix_pathnames = (lp_posix_pathnames() ||
 348                                 (ucf_flags & UCF_POSIX_PATHNAMES));
 349
 350         /*
 351          * Strip off the stream, and add it back when we're done with the
 352          * base_name.
 353          */
 354         if (!posix_pathnames) {
 355                 stream = strchr_m(smb_fname->base_name, ':');
 356
 357                 if (stream != NULL) {
 358                         char *tmp = talloc_strdup(smb_fname, stream);
 359                         if (tmp == NULL) {
 360                                 status = NT_STATUS_NO_MEMORY;
 361                                 goto err;
 362                         }
 363                         /*
 364                          * Since this is actually pointing into
 365                          * smb_fname->base_name this truncates base_name.
 366                          */
 367                         *stream = '\0';
 368                         stream = tmp;
 369                 }
 370         }
 371
 372         start = smb_fname->base_name;
 373
 374         /*
 375          * If we're providing case insensitive semantics or
 376          * the underlying filesystem is case insensitive,
 377          * then a case-normalized hit in the stat-cache is
 378          * authoratitive. JRA.
 379          *
 380          * Note: We're only checking base_name.  The stream_name will be
 381          * added and verified in build_stream_path().
 382          */
 383
 384         if((!conn->case_sensitive || !(conn->fs_capabilities &
 385                                        FILE_CASE_SENSITIVE_SEARCH)) &&
 386             stat_cache_lookup(conn, posix_pathnames, &smb_fname->base_name, &dirpath, &start,
 387                               &smb_fname->st)) {
 388                 goto done;
 389         }
 390
 391         /*
 392          * Make sure "dirpath" is an allocated string, we use this for
 393          * building the directories with talloc_asprintf and free it.
 394          */
 395
 396         if ((dirpath == NULL) && (!(dirpath = talloc_strdup(ctx,"")))) {
 397                 DEBUG(0, ("talloc_strdup failed\n"));
 398                 status = NT_STATUS_NO_MEMORY;
 399                 goto err;
 400         }
 401
 402         /*
 403          * If we have a wildcard we must walk the path to
 404          * find where the error is, even if case sensitive
 405          * is true.
 406          */
 407
 408         name_has_wildcard = ms_has_wild(smb_fname->base_name);
 409         if (name_has_wildcard && !allow_wcard_last_component) {
 410                 /* Wildcard not valid anywhere. */
 411                 status = NT_STATUS_OBJECT_NAME_INVALID;
 412                 goto fail;
 413         }
 414
 415         DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n",
 416                  smb_fname->base_name, dirpath, start));
 417
 418         if (!name_has_wildcard) {
 419                 /*
 420                  * stat the name - if it exists then we can add the stream back (if
 421                  * there was one) and be done!
 422                  */
 423
 424                 if (posix_pathnames) {
 425                         ret = SMB_VFS_LSTAT(conn, smb_fname);
 426                 } else {
 427                         ret = SMB_VFS_STAT(conn, smb_fname);
 428                 }
 429
 430                 if (ret == 0) {
 431                         status = check_for_dot_component(smb_fname);
 432                         if (!NT_STATUS_IS_OK(status)) {
 433                                 goto fail;
 434                         }
 435                         /* Add the path (not including the stream) to the cache. */
 436                         stat_cache_add(orig_path, smb_fname->base_name,
 437                                        conn->case_sensitive);
 438                         DEBUG(5,("conversion of base_name finished %s -> %s\n",
 439                                  orig_path, smb_fname->base_name));
 440                         goto done;
 441                 }
 442
 443                 /* Stat failed - ensure we don't use it. */
 444                 SET_STAT_INVALID(smb_fname->st);
 445
 446                 if (errno == ENOENT) {
 447                         /* Optimization when creating a new file - only
 448                            the last component doesn't exist.
 449                            NOTE : check_parent_exists() doesn't preserve errno.
 450                         */
 451                         int saved_errno = errno;
 452                         status = check_parent_exists(ctx,
 453                                                 conn,
 454                                                 posix_pathnames,
 455                                                 smb_fname,
 456                                                 &dirpath,
 457                                                 &start);
 458                         errno = saved_errno;
 459                         if (!NT_STATUS_IS_OK(status)) {
 460                                 goto fail;
 461                         }
 462                 }
 463
 464                 /*
 465                  * A special case - if we don't have any wildcards or mangling chars and are case
 466                  * sensitive or the underlying filesystem is case insensitive then searching
 467                  * won't help.
 468                  */
 469
 470                 if ((conn->case_sensitive || !(conn->fs_capabilities &
 471                                         FILE_CASE_SENSITIVE_SEARCH)) &&
 472                                 !mangle_is_mangled(smb_fname->base_name, conn->params)) {
 473
 474                         status = check_for_dot_component(smb_fname);
 475                         if (!NT_STATUS_IS_OK(status)) {
 476                                 goto fail;
 477                         }
 478
 479                         /*
 480                          * The stat failed. Could be ok as it could be
 481                          * a new file.
 482                          */
 483
 484                         if (errno == ENOTDIR || errno == ELOOP) {
 485                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 486                                 goto fail;
 487                         } else if (errno == ENOENT) {
 488                                 /*
 489                                  * Was it a missing last component ?
 490                                  * or a missing intermediate component ?
 491                                  */
 492                                 struct smb_filename parent_fname;
 493                                 const char *last_component = NULL;
 494
 495                                 ZERO_STRUCT(parent_fname);
 496                                 if (!parent_dirname(ctx, smb_fname->base_name,
 497                                                         &parent_fname.base_name,
 498                                                         &last_component)) {
 499                                         status = NT_STATUS_NO_MEMORY;
 500                                         goto fail;
 501                                 }
 502                                 if (posix_pathnames) {
 503                                         ret = SMB_VFS_LSTAT(conn, &parent_fname);
 504                                 } else {
 505                                         ret = SMB_VFS_STAT(conn, &parent_fname);
 506                                 }
 507                                 if (ret == -1) {
 508                                         if (errno == ENOTDIR ||
 509                                                         errno == ENOENT ||
 510                                                         errno == ELOOP) {
 511                                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 512                                                 goto fail;
 513                                         }
 514                                 }
 515
 516                                 /*
 517                                  * Missing last component is ok - new file.
 518                                  * Also deal with permission denied elsewhere.
 519                                  * Just drop out to done.
 520                                  */
 521                                 goto done;
 522                         }
 523                 }
 524         } else {
 525                 /*
 526                  * We have a wildcard in the pathname.
 527                  *
 528                  * Optimization for common case where the wildcard
 529                  * is in the last component and the client already
 530                  * sent the correct case.
 531                  * NOTE : check_parent_exists() doesn't preserve errno.
 532                  */
 533                 int saved_errno = errno;
 534                 status = check_parent_exists(ctx,
 535                                         conn,
 536                                         posix_pathnames,
 537                                         smb_fname,
 538                                         &dirpath,
 539                                         &start);
 540                 errno = saved_errno;
 541                 if (!NT_STATUS_IS_OK(status)) {
 542                         goto fail;
 543                 }
 544         }
 545
 546         /*
 547          * is_mangled() was changed to look at an entire pathname, not
 548          * just a component. JRA.
 549          */
 550
 551         if (mangle_is_mangled(start, conn->params)) {
 552                 component_was_mangled = True;
 553         }
 554
 555         /*
 556          * Now we need to recursively match the name against the real
 557          * directory structure.
 558          */
 559
 560         /*
 561          * Match each part of the path name separately, trying the names
 562          * as is first, then trying to scan the directory for matching names.
 563          */
 564
 565         for (; start ; start = (end?end+1:(char *)NULL)) {
 566                 /*
 567                  * Pinpoint the end of this section of the filename.
 568                  */
 569                 /* mb safe. '/' can't be in any encoded char. */
 570                 end = strchr(start, '/');
 571
 572                 /*
 573                  * Chop the name at this point.
 574                  */
 575                 if (end) {
 576                         *end = 0;
 577                 }
 578
 579                 if (save_last_component) {
 580                         TALLOC_FREE(smb_fname->original_lcomp);
 581                         smb_fname->original_lcomp = talloc_strdup(smb_fname,
 582                                                         end ? end + 1 : start);
 583                         if (!smb_fname->original_lcomp) {
 584                                 DEBUG(0, ("talloc failed\n"));
 585                                 status = NT_STATUS_NO_MEMORY;
 586                                 goto err;
 587                         }
 588                 }
 589
 590                 /* The name cannot have a component of "." */
 591
 592                 if (ISDOT(start)) {
 593                         if (!end)  {
 594                                 /* Error code at the end of a pathname. */
 595                                 status = NT_STATUS_OBJECT_NAME_INVALID;
 596                         } else {
 597                                 status = determine_path_error(end+1,
 598                                                 allow_wcard_last_component);
 599                         }
 600                         goto fail;
 601                 }
 602
 603                 /* The name cannot have a wildcard if it's not
 604                    the last component. */
 605
 606                 name_has_wildcard = ms_has_wild(start);
 607
 608                 /* Wildcards never valid within a pathname. */
 609                 if (name_has_wildcard && end) {
 610                         status = NT_STATUS_OBJECT_NAME_INVALID;
 611                         goto fail;
 612                 }
 613
 614                 /* Skip the stat call if it's a wildcard end. */
 615                 if (name_has_wildcard) {
 616                         DEBUG(5,("Wildcard %s\n",start));
 617                         goto done;
 618                 }
 619
 620                 /*
 621                  * Check if the name exists up to this point.
 622                  */
 623
 624                 if (posix_pathnames) {
 625                         ret = SMB_VFS_LSTAT(conn, smb_fname);
 626                 } else {
 627                         ret = SMB_VFS_STAT(conn, smb_fname);
 628                 }
 629
 630                 if (ret == 0) {
 631                         /*
 632                          * It exists. it must either be a directory or this must
 633                          * be the last part of the path for it to be OK.
 634                          */
 635                         if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
 636                                 /*
 637                                  * An intermediate part of the name isn't
 638                                  * a directory.
 639                                  */
 640                                 DEBUG(5,("Not a dir %s\n",start));
 641                                 *end = '/';
 642                                 /*
 643                                  * We need to return the fact that the
 644                                  * intermediate name resolution failed. This
 645                                  * is used to return an error of ERRbadpath
 646                                  * rather than ERRbadfile. Some Windows
 647                                  * applications depend on the difference between
 648                                  * these two errors.
 649                                  */
 650                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 651                                 goto fail;
 652                         }
 653
 654                 } else {
 655                         char *found_name = NULL;
 656
 657                         /* Stat failed - ensure we don't use it. */
 658                         SET_STAT_INVALID(smb_fname->st);
 659
 660                         /*
 661                          * Reset errno so we can detect
 662                          * directory open errors.
 663                          */
 664                         errno = 0;
 665
 666                         /*
 667                          * Try to find this part of the path in the directory.
 668                          */
 669
 670                         if (name_has_wildcard ||
 671                             (get_real_filename(conn, dirpath, start,
 672                                                talloc_tos(),
 673                                                &found_name) == -1)) {
 674                                 char *unmangled;
 675
 676                                 if (end) {
 677                                         /*
 678                                          * An intermediate part of the name
 679                                          * can't be found.
 680                                          */
 681                                         DEBUG(5,("Intermediate not found %s\n",
 682                                                         start));
 683                                         *end = '/';
 684
 685                                         /*
 686                                          * We need to return the fact that the
 687                                          * intermediate name resolution failed.
 688                                          * This is used to return an error of
 689                                          * ERRbadpath rather than ERRbadfile.
 690                                          * Some Windows applications depend on
 691                                          * the difference between these two
 692                                          * errors.
 693                                          */
 694
 695                                         /*
 696                                          * ENOENT, ENOTDIR and ELOOP all map
 697                                          * to NT_STATUS_OBJECT_PATH_NOT_FOUND
 698                                          * in the filename walk.
 699                                          */
 700
 701                                         if (errno == ENOENT ||
 702                                                         errno == ENOTDIR ||
 703                                                         errno == ELOOP) {
 704                                                 status =
 705                                                 NT_STATUS_OBJECT_PATH_NOT_FOUND;
 706                                         }
 707                                         else {
 708                                                 status =
 709                                                 map_nt_error_from_unix(errno);
 710                                         }
 711                                         goto fail;
 712                                 }
 713
 714                                 /*
 715                                  * ENOENT/EACCESS are the only valid errors
 716                                  * here. EACCESS needs handling here for
 717                                  * "dropboxes", i.e. directories where users
 718                                  * can only put stuff with permission -wx.
 719                                  */
 720                                 if ((errno != 0) && (errno != ENOENT)
 721                                     && (errno != EACCES)) {
 722                                         /*
 723                                          * ENOTDIR and ELOOP both map to
 724                                          * NT_STATUS_OBJECT_PATH_NOT_FOUND
 725                                          * in the filename walk.
 726                                          */
 727                                         if (errno == ENOTDIR ||
 728                                                         errno == ELOOP) {
 729                                                 status =
 730                                                 NT_STATUS_OBJECT_PATH_NOT_FOUND;
 731                                         } else {
 732                                                 status =
 733                                                 map_nt_error_from_unix(errno);
 734                                         }
 735                                         goto fail;
 736                                 }
 737
 738                                 /*
 739                                  * Just the last part of the name doesn't exist.
 740                                  * We need to strupper() or strlower() it as
 741                                  * this conversion may be used for file creation
 742                                  * purposes. Fix inspired by
 743                                  * Thomas Neumann <t.neumann@iku-ag.de>.
 744                                  */
 745                                 if (!conn->case_preserve ||
 746                                     (mangle_is_8_3(start, False,
 747                                                    conn->params) &&
 748                                                  !conn->short_case_preserve)) {
 749                                         strnorm(start,
 750                                                 lp_defaultcase(SNUM(conn)));
 751                                 }
 752
 753                                 /*
 754                                  * check on the mangled stack to see if we can
 755                                  * recover the base of the filename.
 756                                  */
 757
 758                                 if (mangle_is_mangled(start, conn->params)
 759                                     && mangle_lookup_name_from_8_3(ctx,
 760                                                         start,
 761                                                         &unmangled,
 762                                                         conn->params)) {
 763                                         char *tmp;
 764                                         size_t start_ofs =
 765                                             start - smb_fname->base_name;
 766
 767                                         if (*dirpath != '\0') {
 768                                                 tmp = talloc_asprintf(
 769                                                         smb_fname, "%s/%s",
 770                                                         dirpath, unmangled);
 771                                                 TALLOC_FREE(unmangled);
 772                                         }
 773                                         else {
 774                                                 tmp = unmangled;
 775                                         }
 776                                         if (tmp == NULL) {
 777                                                 DEBUG(0, ("talloc failed\n"));
 778                                                 status = NT_STATUS_NO_MEMORY;
 779                                                 goto err;
 780                                         }
 781                                         TALLOC_FREE(smb_fname->base_name);
 782                                         smb_fname->base_name = tmp;
 783                                         start =
 784                                             smb_fname->base_name + start_ofs;
 785                                         end = start + strlen(start);
 786                                 }
 787
 788                                 DEBUG(5,("New file %s\n",start));
 789                                 goto done;
 790                         }
 791
 792
 793                         /*
 794                          * Restore the rest of the string. If the string was
 795                          * mangled the size may have changed.
 796                          */
 797                         if (end) {
 798                                 char *tmp;
 799                                 size_t start_ofs =
 800                                     start - smb_fname->base_name;
 801
 802                                 if (*dirpath != '\0') {
 803                                         tmp = talloc_asprintf(smb_fname,
 804                                                 "%s/%s/%s", dirpath,
 805                                                 found_name, end+1);
 806                                 }
 807                                 else {
 808                                         tmp = talloc_asprintf(smb_fname,
 809                                                 "%s/%s", found_name,
 810                                                 end+1);
 811                                 }
 812                                 if (tmp == NULL) {
 813                                         DEBUG(0, ("talloc_asprintf failed\n"));
 814                                         status = NT_STATUS_NO_MEMORY;
 815                                         goto err;
 816                                 }
 817                                 TALLOC_FREE(smb_fname->base_name);
 818                                 smb_fname->base_name = tmp;
 819                                 start = smb_fname->base_name + start_ofs;
 820                                 end = start + strlen(found_name);
 821                                 *end = '\0';
 822                         } else {
 823                                 char *tmp;
 824                                 size_t start_ofs =
 825                                     start - smb_fname->base_name;
 826
 827                                 if (*dirpath != '\0') {
 828                                         tmp = talloc_asprintf(smb_fname,
 829                                                 "%s/%s", dirpath,
 830                                                 found_name);
 831                                 } else {
 832                                         tmp = talloc_strdup(smb_fname,
 833                                                 found_name);
 834                                 }
 835                                 if (tmp == NULL) {
 836                                         DEBUG(0, ("talloc failed\n"));
 837                                         status = NT_STATUS_NO_MEMORY;
 838                                         goto err;
 839                                 }
 840                                 TALLOC_FREE(smb_fname->base_name);
 841                                 smb_fname->base_name = tmp;
 842                                 start = smb_fname->base_name + start_ofs;
 843
 844                                 /*
 845                                  * We just scanned for, and found the end of
 846                                  * the path. We must return a valid stat struct
 847                                  * if it exists. JRA.
 848                                  */
 849
 850                                 if (posix_pathnames) {
 851                                         ret = SMB_VFS_LSTAT(conn, smb_fname);
 852                                 } else {
 853                                         ret = SMB_VFS_STAT(conn, smb_fname);
 854                                 }
 855
 856                                 if (ret != 0) {
 857                                         SET_STAT_INVALID(smb_fname->st);
 858                                 }
 859                         }
 860
 861                         TALLOC_FREE(found_name);
 862                 } /* end else */
 863
 864 #ifdef DEVELOPER
 865                 /*
 866                  * This sucks!
 867                  * We should never provide different behaviors
 868                  * depending on DEVELOPER!!!
 869                  */
 870                 if (VALID_STAT(smb_fname->st)) {
 871                         bool delete_pending;
 872                         uint32_t name_hash;
 873
 874                         status = file_name_hash(conn,
 875                                         smb_fname_str_dbg(smb_fname),
 876                                         &name_hash);
 877                         if (!NT_STATUS_IS_OK(status)) {
 878                                 goto fail;
 879                         }
 880
 881                         get_file_infos(vfs_file_id_from_sbuf(conn,
 882                                                              &smb_fname->st),
 883                                        name_hash,
 884                                        &delete_pending, NULL);
 885                         if (delete_pending) {
 886                                 status = NT_STATUS_DELETE_PENDING;
 887                                 goto fail;
 888                         }
 889                 }
 890 #endif
 891
 892                 /*
 893                  * Add to the dirpath that we have resolved so far.
 894                  */
 895
 896                 if (*dirpath != '\0') {
 897                         char *tmp = talloc_asprintf(ctx,
 898                                         "%s/%s", dirpath, start);
 899                         if (!tmp) {
 900                                 DEBUG(0, ("talloc_asprintf failed\n"));
 901                                 status = NT_STATUS_NO_MEMORY;
 902                                 goto err;
 903                         }
 904                         TALLOC_FREE(dirpath);
 905                         dirpath = tmp;
 906                 }
 907                 else {
 908                         TALLOC_FREE(dirpath);
 909                         if (!(dirpath = talloc_strdup(ctx,start))) {
 910                                 DEBUG(0, ("talloc_strdup failed\n"));
 911                                 status = NT_STATUS_NO_MEMORY;
 912                                 goto err;
 913                         }
 914                 }
 915
 916                 /*
 917                  * Cache the dirpath thus far. Don't cache a name with mangled
 918                  * or wildcard components as this can change the size.
 919                  */
 920                 if(!component_was_mangled && !name_has_wildcard) {
 921                         stat_cache_add(orig_path, dirpath,
 922                                         conn->case_sensitive);
 923                 }
 924
 925                 /*
 926                  * Restore the / that we wiped out earlier.
 927                  */
 928                 if (end) {
 929                         *end = '/';
 930                 }
 931         }
 932
 933         /*
 934          * Cache the full path. Don't cache a name with mangled or wildcard
 935          * components as this can change the size.
 936          */
 937
 938         if(!component_was_mangled && !name_has_wildcard) {
 939                 stat_cache_add(orig_path, smb_fname->base_name,
 940                                conn->case_sensitive);
 941         }
 942
 943         /*
 944          * The name has been resolved.
 945          */
 946
 947         DEBUG(5,("conversion finished %s -> %s\n", orig_path,
 948                  smb_fname->base_name));
 949
 950  done:
 951         /* Add back the stream if one was stripped off originally. */
 952         if (stream != NULL) {
 953                 smb_fname->stream_name = stream;
 954
 955                 /* Check path now that the base_name has been converted. */
 956                 status = build_stream_path(ctx, conn, orig_path, smb_fname);
 957                 if (!NT_STATUS_IS_OK(status)) {
 958                         goto fail;
 959                 }
 960         }
 961         TALLOC_FREE(dirpath);
 962         *smb_fname_out = smb_fname;
 963         return NT_STATUS_OK;
 964  fail:
 965         DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
 966         if (*dirpath != '\0') {
 967                 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
 968                                                        dirpath, start);
 969         } else {
 970                 smb_fname->base_name = talloc_strdup(smb_fname, start);
 971         }
 972         if (!smb_fname->base_name) {
 973                 DEBUG(0, ("talloc_asprintf failed\n"));
 974                 status = NT_STATUS_NO_MEMORY;
 975                 goto err;
 976         }
 977
 978         *smb_fname_out = smb_fname;
 979         TALLOC_FREE(dirpath);
 980         return status;
 981  err:
 982         TALLOC_FREE(smb_fname);
 983         return status;
 984 }
 985
 986 /****************************************************************************
 987  Ensure a path is not vetod.
 988 ****************************************************************************/
 989
 990 NTSTATUS check_veto_path(connection_struct *conn, const char *name)
 991 {
 992         if (IS_VETO_PATH(conn, name))  {
 993                 /* Is it not dot or dot dot. */
 994                 if (!(ISDOT(name) || ISDOTDOT(name))) {
 995                         DEBUG(5,("check_veto_path: file path name %s vetoed\n",
 996                                                 name));
 997                         return map_nt_error_from_unix(ENOENT);
 998                 }
 999         }
1000         return NT_STATUS_OK;
1001 }
1002
1003 /****************************************************************************
1004  Check a filename - possibly calling check_reduced_name.
1005  This is called by every routine before it allows an operation on a filename.
1006  It does any final confirmation necessary to ensure that the filename is
1007  a valid one for the user to access.
1008 ****************************************************************************/
1009
1010 NTSTATUS check_name(connection_struct *conn, const char *name)
1011 {
1012         NTSTATUS status = check_veto_path(conn, name);
1013
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 return status;
1016         }
1017
1018         if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
1019                 status = check_reduced_name(conn,name);
1020                 if (!NT_STATUS_IS_OK(status)) {
1021                         DEBUG(5,("check_name: name %s failed with %s\n",name,
1022                                                 nt_errstr(status)));
1023                         return status;
1024                 }
1025         }
1026
1027         return NT_STATUS_OK;
1028 }
1029
1030 /****************************************************************************
1031  Check if two filenames are equal.
1032  This needs to be careful about whether we are case sensitive.
1033 ****************************************************************************/
1034
1035 static bool fname_equal(const char *name1, const char *name2,
1036                 bool case_sensitive)
1037 {
1038         /* Normal filename handling */
1039         if (case_sensitive) {
1040                 return(strcmp(name1,name2) == 0);
1041         }
1042
1043         return(strequal(name1,name2));
1044 }
1045
1046 /****************************************************************************
1047  Scan a directory to find a filename, matching without case sensitivity.
1048  If the name looks like a mangled name then try via the mangling functions
1049 ****************************************************************************/
1050
1051 static int get_real_filename_full_scan(connection_struct *conn,
1052                                        const char *path, const char *name,
1053                                        bool mangled,
1054                                        TALLOC_CTX *mem_ctx, char **found_name)
1055 {
1056         struct smb_Dir *cur_dir;
1057         const char *dname = NULL;
1058         char *talloced = NULL;
1059         char *unmangled_name = NULL;
1060         long curpos;
1061
1062         /* handle null paths */
1063         if ((path == NULL) || (*path == 0)) {
1064                 path = ".";
1065         }
1066
1067         /* If we have a case-sensitive filesystem, it doesn't do us any
1068          * good to search for a name. If a case variation of the name was
1069          * there, then the original stat(2) would have found it.
1070          */
1071         if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1072                 errno = ENOENT;
1073                 return -1;
1074         }
1075
1076         /*
1077          * The incoming name can be mangled, and if we de-mangle it
1078          * here it will not compare correctly against the filename (name2)
1079          * read from the directory and then mangled by the name_to_8_3()
1080          * call. We need to mangle both names or neither.
1081          * (JRA).
1082          *
1083          * Fix for bug found by Dina Fine. If in case sensitive mode then
1084          * the mangle cache is no good (3 letter extension could be wrong
1085          * case - so don't demangle in this case - leave as mangled and
1086          * allow the mangling of the directory entry read (which is done
1087          * case insensitively) to match instead. This will lead to more
1088          * false positive matches but we fail completely without it. JRA.
1089          */
1090
1091         if (mangled && !conn->case_sensitive) {
1092                 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1093                                                        &unmangled_name,
1094                                                        conn->params);
1095                 if (!mangled) {
1096                         /* Name is now unmangled. */
1097                         name = unmangled_name;
1098                 }
1099         }
1100
1101         /* open the directory */
1102         if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1103                 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1104                 TALLOC_FREE(unmangled_name);
1105                 return -1;
1106         }
1107
1108         /* now scan for matching names */
1109         curpos = 0;
1110         while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1111
1112                 /* Is it dot or dot dot. */
1113                 if (ISDOT(dname) || ISDOTDOT(dname)) {
1114                         TALLOC_FREE(talloced);
1115                         continue;
1116                 }
1117
1118                 /*
1119                  * At this point dname is the unmangled name.
1120                  * name is either mangled or not, depending on the state
1121                  * of the "mangled" variable. JRA.
1122                  */
1123
1124                 /*
1125                  * Check mangled name against mangled name, or unmangled name
1126                  * against unmangled name.
1127                  */
1128
1129                 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1130                         fname_equal(name, dname, conn->case_sensitive)) {
1131                         /* we've found the file, change it's name and return */
1132                         *found_name = talloc_strdup(mem_ctx, dname);
1133                         TALLOC_FREE(unmangled_name);
1134                         TALLOC_FREE(cur_dir);
1135                         if (!*found_name) {
1136                                 errno = ENOMEM;
1137                                 TALLOC_FREE(talloced);
1138                                 return -1;
1139                         }
1140                         TALLOC_FREE(talloced);
1141                         return 0;
1142                 }
1143                 TALLOC_FREE(talloced);
1144         }
1145
1146         TALLOC_FREE(unmangled_name);
1147         TALLOC_FREE(cur_dir);
1148         errno = ENOENT;
1149         return -1;
1150 }
1151
1152 /****************************************************************************
1153  Wrapper around the vfs get_real_filename and the full directory scan
1154  fallback.
1155 ****************************************************************************/
1156
1157 int get_real_filename(connection_struct *conn, const char *path,
1158                       const char *name, TALLOC_CTX *mem_ctx,
1159                       char **found_name)
1160 {
1161         int ret;
1162         bool mangled;
1163
1164         mangled = mangle_is_mangled(name, conn->params);
1165
1166         if (mangled) {
1167                 return get_real_filename_full_scan(conn, path, name, mangled,
1168                                                    mem_ctx, found_name);
1169         }
1170
1171         /* Try the vfs first to take advantage of case-insensitive stat. */
1172         ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1173
1174         /*
1175          * If the case-insensitive stat was successful, or returned an error
1176          * other than EOPNOTSUPP then there is no need to fall back on the
1177          * full directory scan.
1178          */
1179         if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1180                 return ret;
1181         }
1182
1183         return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1184                                            found_name);
1185 }
1186
1187 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1188                                   connection_struct *conn,
1189                                   const char *orig_path,
1190                                   struct smb_filename *smb_fname)
1191 {
1192         NTSTATUS status;
1193         unsigned int i, num_streams = 0;
1194         struct stream_struct *streams = NULL;
1195
1196         if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1197                 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1198                 return NT_STATUS_OK;
1199         }
1200
1201         if (errno != ENOENT) {
1202                 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1203                 status = map_nt_error_from_unix(errno);
1204                 goto fail;
1205         }
1206
1207         /* Fall back to a case-insensitive scan of all streams on the file. */
1208         status = vfs_streaminfo(conn, NULL, smb_fname->base_name, mem_ctx,
1209                                 &num_streams, &streams);
1210
1211         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1212                 SET_STAT_INVALID(smb_fname->st);
1213                 return NT_STATUS_OK;
1214         }
1215
1216         if (!NT_STATUS_IS_OK(status)) {
1217                 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1218                 goto fail;
1219         }
1220
1221         for (i=0; i<num_streams; i++) {
1222                 DEBUG(10, ("comparing [%s] and [%s]: ",
1223                            smb_fname->stream_name, streams[i].name));
1224                 if (fname_equal(smb_fname->stream_name, streams[i].name,
1225                                 conn->case_sensitive)) {
1226                         DEBUGADD(10, ("equal\n"));
1227                         break;
1228                 }
1229                 DEBUGADD(10, ("not equal\n"));
1230         }
1231
1232         /* Couldn't find the stream. */
1233         if (i == num_streams) {
1234                 SET_STAT_INVALID(smb_fname->st);
1235                 TALLOC_FREE(streams);
1236                 return NT_STATUS_OK;
1237         }
1238
1239         DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1240                 smb_fname->stream_name, streams[i].name));
1241
1242
1243         TALLOC_FREE(smb_fname->stream_name);
1244         smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1245         if (smb_fname->stream_name == NULL) {
1246                 status = NT_STATUS_NO_MEMORY;
1247                 goto fail;
1248         }
1249
1250         SET_STAT_INVALID(smb_fname->st);
1251
1252         if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1253                 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1254         }
1255         status = NT_STATUS_OK;
1256  fail:
1257         TALLOC_FREE(streams);
1258         return status;
1259 }
1260
1261 /**
1262  * Go through all the steps to validate a filename.
1263  *
1264  * @param ctx           talloc_ctx to allocate memory with.
1265  * @param conn          connection struct for vfs calls.
1266  * @param dfs_path      Whether this path requires dfs resolution.
1267  * @param name_in       The unconverted name.
1268  * @param ucf_flags     flags to pass through to unix_convert().
1269  *                      UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1270  *                      p_cont_wcard != NULL and is true and
1271  *                      UCF_COND_ALLOW_WCARD_LCOMP.
1272  * @param p_cont_wcard  If not NULL, will be set to true if the dfs path
1273  *                      resolution detects a wildcard.
1274  * @param pp_smb_fname  The final converted name will be allocated if the
1275  *                      return is NT_STATUS_OK.
1276  *
1277  * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1278  *         error otherwise.
1279  */
1280 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1281                                 connection_struct *conn,
1282                                 bool dfs_path,
1283                                 const char *name_in,
1284                                 uint32_t ucf_flags,
1285                                 bool *ppath_contains_wcard,
1286                                 struct smb_filename **pp_smb_fname)
1287 {
1288         NTSTATUS status;
1289         bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1290         char *fname = NULL;
1291
1292         *pp_smb_fname = NULL;
1293
1294         status = resolve_dfspath_wcard(ctx, conn,
1295                                 dfs_path,
1296                                 name_in,
1297                                 allow_wcards,
1298                                 &fname,
1299                                 ppath_contains_wcard);
1300         if (!NT_STATUS_IS_OK(status)) {
1301                 DEBUG(10,("filename_convert: resolve_dfspath failed "
1302                         "for name %s with %s\n",
1303                         name_in,
1304                         nt_errstr(status) ));
1305                 return status;
1306         }
1307
1308         if (is_fake_file_path(name_in)) {
1309                 SMB_STRUCT_STAT st;
1310                 ZERO_STRUCT(st);
1311                 st.st_ex_nlink = 1;
1312                 status = create_synthetic_smb_fname_split(ctx,
1313                                                           name_in,
1314                                                           &st,
1315                                                           pp_smb_fname);
1316                 return status;
1317         }
1318
1319         /*
1320          * If the caller conditionally allows wildcard lookups, only add the
1321          * always allow if the path actually does contain a wildcard.
1322          */
1323         if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1324             ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1325                 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1326         }
1327
1328         status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1329         if (!NT_STATUS_IS_OK(status)) {
1330                 DEBUG(10,("filename_convert: unix_convert failed "
1331                         "for name %s with %s\n",
1332                         fname,
1333                         nt_errstr(status) ));
1334                 return status;
1335         }
1336
1337         if ((ucf_flags & UCF_UNIX_NAME_LOOKUP) &&
1338                         VALID_STAT((*pp_smb_fname)->st) &&
1339                         S_ISLNK((*pp_smb_fname)->st.st_ex_mode)) {
1340                 return check_veto_path(conn, (*pp_smb_fname)->base_name);
1341         }
1342
1343         status = check_name(conn, (*pp_smb_fname)->base_name);
1344         if (!NT_STATUS_IS_OK(status)) {
1345                 DEBUG(3,("filename_convert: check_name failed "
1346                         "for name %s with %s\n",
1347                         smb_fname_str_dbg(*pp_smb_fname),
1348                         nt_errstr(status) ));
1349                 TALLOC_FREE(*pp_smb_fname);
1350                 return status;
1351         }
1352
1353         return status;
1354 }