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 discard_const_p
 167          * here as last_component points
 168          * into our smb_fname->base_name.
 169          */
 170         *pp_start = discard_const_p(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, &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                         status = check_parent_exists(ctx,
 450                                                 conn,
 451                                                 posix_pathnames,
 452                                                 smb_fname,
 453                                                 &dirpath,
 454                                                 &start);
 455                         if (!NT_STATUS_IS_OK(status)) {
 456                                 goto fail;
 457                         }
 458                 }
 459
 460                 /*
 461                  * A special case - if we don't have any wildcards or mangling chars and are case
 462                  * sensitive or the underlying filesystem is case insensitive then searching
 463                  * won't help.
 464                  */
 465
 466                 if ((conn->case_sensitive || !(conn->fs_capabilities &
 467                                         FILE_CASE_SENSITIVE_SEARCH)) &&
 468                                 !mangle_is_mangled(smb_fname->base_name, conn->params)) {
 469
 470                         status = check_for_dot_component(smb_fname);
 471                         if (!NT_STATUS_IS_OK(status)) {
 472                                 goto fail;
 473                         }
 474
 475                         /*
 476                          * The stat failed. Could be ok as it could be
 477                          * a new file.
 478                          */
 479
 480                         if (errno == ENOTDIR || errno == ELOOP) {
 481                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 482                                 goto fail;
 483                         } else if (errno == ENOENT) {
 484                                 /*
 485                                  * Was it a missing last component ?
 486                                  * or a missing intermediate component ?
 487                                  */
 488                                 struct smb_filename parent_fname;
 489                                 const char *last_component = NULL;
 490
 491                                 ZERO_STRUCT(parent_fname);
 492                                 if (!parent_dirname(ctx, smb_fname->base_name,
 493                                                         &parent_fname.base_name,
 494                                                         &last_component)) {
 495                                         status = NT_STATUS_NO_MEMORY;
 496                                         goto fail;
 497                                 }
 498                                 if (posix_pathnames) {
 499                                         ret = SMB_VFS_LSTAT(conn, &parent_fname);
 500                                 } else {
 501                                         ret = SMB_VFS_STAT(conn, &parent_fname);
 502                                 }
 503                                 if (ret == -1) {
 504                                         if (errno == ENOTDIR ||
 505                                                         errno == ENOENT ||
 506                                                         errno == ELOOP) {
 507                                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 508                                                 goto fail;
 509                                         }
 510                                 }
 511
 512                                 /*
 513                                  * Missing last component is ok - new file.
 514                                  * Also deal with permission denied elsewhere.
 515                                  * Just drop out to done.
 516                                  */
 517                                 goto done;
 518                         }
 519                 }
 520         } else {
 521                 /*
 522                  * We have a wildcard in the pathname.
 523                  *
 524                  * Optimization for common case where the wildcard
 525                  * is in the last component and the client already
 526                  * sent the correct case.
 527                  */
 528                 status = check_parent_exists(ctx,
 529                                         conn,
 530                                         posix_pathnames,
 531                                         smb_fname,
 532                                         &dirpath,
 533                                         &start);
 534                 if (!NT_STATUS_IS_OK(status)) {
 535                         goto fail;
 536                 }
 537         }
 538
 539         /*
 540          * is_mangled() was changed to look at an entire pathname, not
 541          * just a component. JRA.
 542          */
 543
 544         if (mangle_is_mangled(start, conn->params)) {
 545                 component_was_mangled = True;
 546         }
 547
 548         /*
 549          * Now we need to recursively match the name against the real
 550          * directory structure.
 551          */
 552
 553         /*
 554          * Match each part of the path name separately, trying the names
 555          * as is first, then trying to scan the directory for matching names.
 556          */
 557
 558         for (; start ; start = (end?end+1:(char *)NULL)) {
 559                 /*
 560                  * Pinpoint the end of this section of the filename.
 561                  */
 562                 /* mb safe. '/' can't be in any encoded char. */
 563                 end = strchr(start, '/');
 564
 565                 /*
 566                  * Chop the name at this point.
 567                  */
 568                 if (end) {
 569                         *end = 0;
 570                 }
 571
 572                 if (save_last_component) {
 573                         TALLOC_FREE(smb_fname->original_lcomp);
 574                         smb_fname->original_lcomp = talloc_strdup(smb_fname,
 575                                                         end ? end + 1 : start);
 576                         if (!smb_fname->original_lcomp) {
 577                                 DEBUG(0, ("talloc failed\n"));
 578                                 status = NT_STATUS_NO_MEMORY;
 579                                 goto err;
 580                         }
 581                 }
 582
 583                 /* The name cannot have a component of "." */
 584
 585                 if (ISDOT(start)) {
 586                         if (!end)  {
 587                                 /* Error code at the end of a pathname. */
 588                                 status = NT_STATUS_OBJECT_NAME_INVALID;
 589                         } else {
 590                                 status = determine_path_error(end+1,
 591                                                 allow_wcard_last_component);
 592                         }
 593                         goto fail;
 594                 }
 595
 596                 /* The name cannot have a wildcard if it's not
 597                    the last component. */
 598
 599                 name_has_wildcard = ms_has_wild(start);
 600
 601                 /* Wildcards never valid within a pathname. */
 602                 if (name_has_wildcard && end) {
 603                         status = NT_STATUS_OBJECT_NAME_INVALID;
 604                         goto fail;
 605                 }
 606
 607                 /* Skip the stat call if it's a wildcard end. */
 608                 if (name_has_wildcard) {
 609                         DEBUG(5,("Wildcard %s\n",start));
 610                         goto done;
 611                 }
 612
 613                 /*
 614                  * Check if the name exists up to this point.
 615                  */
 616
 617                 if (posix_pathnames) {
 618                         ret = SMB_VFS_LSTAT(conn, smb_fname);
 619                 } else {
 620                         ret = SMB_VFS_STAT(conn, smb_fname);
 621                 }
 622
 623                 if (ret == 0) {
 624                         /*
 625                          * It exists. it must either be a directory or this must
 626                          * be the last part of the path for it to be OK.
 627                          */
 628                         if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
 629                                 /*
 630                                  * An intermediate part of the name isn't
 631                                  * a directory.
 632                                  */
 633                                 DEBUG(5,("Not a dir %s\n",start));
 634                                 *end = '/';
 635                                 /*
 636                                  * We need to return the fact that the
 637                                  * intermediate name resolution failed. This
 638                                  * is used to return an error of ERRbadpath
 639                                  * rather than ERRbadfile. Some Windows
 640                                  * applications depend on the difference between
 641                                  * these two errors.
 642                                  */
 643                                 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
 644                                 goto fail;
 645                         }
 646
 647                 } else {
 648                         char *found_name = NULL;
 649
 650                         /* Stat failed - ensure we don't use it. */
 651                         SET_STAT_INVALID(smb_fname->st);
 652
 653                         /*
 654                          * Reset errno so we can detect
 655                          * directory open errors.
 656                          */
 657                         errno = 0;
 658
 659                         /*
 660                          * Try to find this part of the path in the directory.
 661                          */
 662
 663                         if (name_has_wildcard ||
 664                             (get_real_filename(conn, dirpath, start,
 665                                                talloc_tos(),
 666                                                &found_name) == -1)) {
 667                                 char *unmangled;
 668
 669                                 if (end) {
 670                                         /*
 671                                          * An intermediate part of the name
 672                                          * can't be found.
 673                                          */
 674                                         DEBUG(5,("Intermediate not found %s\n",
 675                                                         start));
 676                                         *end = '/';
 677
 678                                         /*
 679                                          * We need to return the fact that the
 680                                          * intermediate name resolution failed.
 681                                          * This is used to return an error of
 682                                          * ERRbadpath rather than ERRbadfile.
 683                                          * Some Windows applications depend on
 684                                          * the difference between these two
 685                                          * errors.
 686                                          */
 687
 688                                         /*
 689                                          * ENOENT, ENOTDIR and ELOOP all map
 690                                          * to NT_STATUS_OBJECT_PATH_NOT_FOUND
 691                                          * in the filename walk.
 692                                          */
 693
 694                                         if (errno == ENOENT ||
 695                                                         errno == ENOTDIR ||
 696                                                         errno == ELOOP) {
 697                                                 status =
 698                                                 NT_STATUS_OBJECT_PATH_NOT_FOUND;
 699                                         }
 700                                         else {
 701                                                 status =
 702                                                 map_nt_error_from_unix(errno);
 703                                         }
 704                                         goto fail;
 705                                 }
 706
 707                                 /*
 708                                  * ENOENT/EACCESS are the only valid errors
 709                                  * here. EACCESS needs handling here for
 710                                  * "dropboxes", i.e. directories where users
 711                                  * can only put stuff with permission -wx.
 712                                  */
 713                                 if ((errno != 0) && (errno != ENOENT)
 714                                     && (errno != EACCES)) {
 715                                         /*
 716                                          * ENOTDIR and ELOOP both map to
 717                                          * NT_STATUS_OBJECT_PATH_NOT_FOUND
 718                                          * in the filename walk.
 719                                          */
 720                                         if (errno == ENOTDIR ||
 721                                                         errno == ELOOP) {
 722                                                 status =
 723                                                 NT_STATUS_OBJECT_PATH_NOT_FOUND;
 724                                         } else {
 725                                                 status =
 726                                                 map_nt_error_from_unix(errno);
 727                                         }
 728                                         goto fail;
 729                                 }
 730
 731                                 /*
 732                                  * Just the last part of the name doesn't exist.
 733                                  * We need to strupper() or strlower() it as
 734                                  * this conversion may be used for file creation
 735                                  * purposes. Fix inspired by
 736                                  * Thomas Neumann <t.neumann@iku-ag.de>.
 737                                  */
 738                                 if (!conn->case_preserve ||
 739                                     (mangle_is_8_3(start, False,
 740                                                    conn->params) &&
 741                                                  !conn->short_case_preserve)) {
 742                                         strnorm(start,
 743                                                 lp_defaultcase(SNUM(conn)));
 744                                 }
 745
 746                                 /*
 747                                  * check on the mangled stack to see if we can
 748                                  * recover the base of the filename.
 749                                  */
 750
 751                                 if (mangle_is_mangled(start, conn->params)
 752                                     && mangle_lookup_name_from_8_3(ctx,
 753                                                         start,
 754                                                         &unmangled,
 755                                                         conn->params)) {
 756                                         char *tmp;
 757                                         size_t start_ofs =
 758                                             start - smb_fname->base_name;
 759
 760                                         if (*dirpath != '\0') {
 761                                                 tmp = talloc_asprintf(
 762                                                         smb_fname, "%s/%s",
 763                                                         dirpath, unmangled);
 764                                                 TALLOC_FREE(unmangled);
 765                                         }
 766                                         else {
 767                                                 tmp = unmangled;
 768                                         }
 769                                         if (tmp == NULL) {
 770                                                 DEBUG(0, ("talloc failed\n"));
 771                                                 status = NT_STATUS_NO_MEMORY;
 772                                                 goto err;
 773                                         }
 774                                         TALLOC_FREE(smb_fname->base_name);
 775                                         smb_fname->base_name = tmp;
 776                                         start =
 777                                             smb_fname->base_name + start_ofs;
 778                                         end = start + strlen(start);
 779                                 }
 780
 781                                 DEBUG(5,("New file %s\n",start));
 782                                 goto done;
 783                         }
 784
 785
 786                         /*
 787                          * Restore the rest of the string. If the string was
 788                          * mangled the size may have changed.
 789                          */
 790                         if (end) {
 791                                 char *tmp;
 792                                 size_t start_ofs =
 793                                     start - smb_fname->base_name;
 794
 795                                 if (*dirpath != '\0') {
 796                                         tmp = talloc_asprintf(smb_fname,
 797                                                 "%s/%s/%s", dirpath,
 798                                                 found_name, end+1);
 799                                 }
 800                                 else {
 801                                         tmp = talloc_asprintf(smb_fname,
 802                                                 "%s/%s", found_name,
 803                                                 end+1);
 804                                 }
 805                                 if (tmp == NULL) {
 806                                         DEBUG(0, ("talloc_asprintf failed\n"));
 807                                         status = NT_STATUS_NO_MEMORY;
 808                                         goto err;
 809                                 }
 810                                 TALLOC_FREE(smb_fname->base_name);
 811                                 smb_fname->base_name = tmp;
 812                                 start = smb_fname->base_name + start_ofs;
 813                                 end = start + strlen(found_name);
 814                                 *end = '\0';
 815                         } else {
 816                                 char *tmp;
 817                                 size_t start_ofs =
 818                                     start - smb_fname->base_name;
 819
 820                                 if (*dirpath != '\0') {
 821                                         tmp = talloc_asprintf(smb_fname,
 822                                                 "%s/%s", dirpath,
 823                                                 found_name);
 824                                 } else {
 825                                         tmp = talloc_strdup(smb_fname,
 826                                                 found_name);
 827                                 }
 828                                 if (tmp == NULL) {
 829                                         DEBUG(0, ("talloc failed\n"));
 830                                         status = NT_STATUS_NO_MEMORY;
 831                                         goto err;
 832                                 }
 833                                 TALLOC_FREE(smb_fname->base_name);
 834                                 smb_fname->base_name = tmp;
 835                                 start = smb_fname->base_name + start_ofs;
 836
 837                                 /*
 838                                  * We just scanned for, and found the end of
 839                                  * the path. We must return a valid stat struct
 840                                  * if it exists. JRA.
 841                                  */
 842
 843                                 if (posix_pathnames) {
 844                                         ret = SMB_VFS_LSTAT(conn, smb_fname);
 845                                 } else {
 846                                         ret = SMB_VFS_STAT(conn, smb_fname);
 847                                 }
 848
 849                                 if (ret != 0) {
 850                                         SET_STAT_INVALID(smb_fname->st);
 851                                 }
 852                         }
 853
 854                         TALLOC_FREE(found_name);
 855                 } /* end else */
 856
 857 #ifdef DEVELOPER
 858                 /*
 859                  * This sucks!
 860                  * We should never provide different behaviors
 861                  * depending on DEVELOPER!!!
 862                  */
 863                 if (VALID_STAT(smb_fname->st)) {
 864                         bool delete_pending;
 865                         uint32_t name_hash;
 866
 867                         status = file_name_hash(conn,
 868                                         smb_fname_str_dbg(smb_fname),
 869                                         &name_hash);
 870                         if (!NT_STATUS_IS_OK(status)) {
 871                                 goto fail;
 872                         }
 873
 874                         get_file_infos(vfs_file_id_from_sbuf(conn,
 875                                                              &smb_fname->st),
 876                                        name_hash,
 877                                        &delete_pending, NULL);
 878                         if (delete_pending) {
 879                                 status = NT_STATUS_DELETE_PENDING;
 880                                 goto fail;
 881                         }
 882                 }
 883 #endif
 884
 885                 /*
 886                  * Add to the dirpath that we have resolved so far.
 887                  */
 888
 889                 if (*dirpath != '\0') {
 890                         char *tmp = talloc_asprintf(ctx,
 891                                         "%s/%s", dirpath, start);
 892                         if (!tmp) {
 893                                 DEBUG(0, ("talloc_asprintf failed\n"));
 894                                 status = NT_STATUS_NO_MEMORY;
 895                                 goto err;
 896                         }
 897                         TALLOC_FREE(dirpath);
 898                         dirpath = tmp;
 899                 }
 900                 else {
 901                         TALLOC_FREE(dirpath);
 902                         if (!(dirpath = talloc_strdup(ctx,start))) {
 903                                 DEBUG(0, ("talloc_strdup failed\n"));
 904                                 status = NT_STATUS_NO_MEMORY;
 905                                 goto err;
 906                         }
 907                 }
 908
 909                 /*
 910                  * Cache the dirpath thus far. Don't cache a name with mangled
 911                  * or wildcard components as this can change the size.
 912                  */
 913                 if(!component_was_mangled && !name_has_wildcard) {
 914                         stat_cache_add(orig_path, dirpath,
 915                                         conn->case_sensitive);
 916                 }
 917
 918                 /*
 919                  * Restore the / that we wiped out earlier.
 920                  */
 921                 if (end) {
 922                         *end = '/';
 923                 }
 924         }
 925
 926         /*
 927          * Cache the full path. Don't cache a name with mangled or wildcard
 928          * components as this can change the size.
 929          */
 930
 931         if(!component_was_mangled && !name_has_wildcard) {
 932                 stat_cache_add(orig_path, smb_fname->base_name,
 933                                conn->case_sensitive);
 934         }
 935
 936         /*
 937          * The name has been resolved.
 938          */
 939
 940         DEBUG(5,("conversion finished %s -> %s\n", orig_path,
 941                  smb_fname->base_name));
 942
 943  done:
 944         /* Add back the stream if one was stripped off originally. */
 945         if (stream != NULL) {
 946                 smb_fname->stream_name = stream;
 947
 948                 /* Check path now that the base_name has been converted. */
 949                 status = build_stream_path(ctx, conn, orig_path, smb_fname);
 950                 if (!NT_STATUS_IS_OK(status)) {
 951                         goto fail;
 952                 }
 953         }
 954         TALLOC_FREE(dirpath);
 955         *smb_fname_out = smb_fname;
 956         return NT_STATUS_OK;
 957  fail:
 958         DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
 959         if (*dirpath != '\0') {
 960                 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
 961                                                        dirpath, start);
 962         } else {
 963                 smb_fname->base_name = talloc_strdup(smb_fname, start);
 964         }
 965         if (!smb_fname->base_name) {
 966                 DEBUG(0, ("talloc_asprintf failed\n"));
 967                 status = NT_STATUS_NO_MEMORY;
 968                 goto err;
 969         }
 970
 971         *smb_fname_out = smb_fname;
 972         TALLOC_FREE(dirpath);
 973         return status;
 974  err:
 975         TALLOC_FREE(smb_fname);
 976         return status;
 977 }
 978
 979 /****************************************************************************
 980  Check a filename - possibly calling check_reduced_name.
 981  This is called by every routine before it allows an operation on a filename.
 982  It does any final confirmation necessary to ensure that the filename is
 983  a valid one for the user to access.
 984 ****************************************************************************/
 985
 986 NTSTATUS check_name(connection_struct *conn, const char *name)
 987 {
 988         if (IS_VETO_PATH(conn, name))  {
 989                 /* Is it not dot or dot dot. */
 990                 if (!(ISDOT(name) || ISDOTDOT(name))) {
 991                         DEBUG(5,("check_name: file path name %s vetoed\n",
 992                                                 name));
 993                         return map_nt_error_from_unix(ENOENT);
 994                 }
 995         }
 996
 997         if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
 998                 NTSTATUS status = check_reduced_name(conn,name);
 999                 if (!NT_STATUS_IS_OK(status)) {
1000                         DEBUG(5,("check_name: name %s failed with %s\n",name,
1001                                                 nt_errstr(status)));
1002                         return status;
1003                 }
1004         }
1005
1006         return NT_STATUS_OK;
1007 }
1008
1009 /****************************************************************************
1010  Check if two filenames are equal.
1011  This needs to be careful about whether we are case sensitive.
1012 ****************************************************************************/
1013
1014 static bool fname_equal(const char *name1, const char *name2,
1015                 bool case_sensitive)
1016 {
1017         /* Normal filename handling */
1018         if (case_sensitive) {
1019                 return(strcmp(name1,name2) == 0);
1020         }
1021
1022         return(strequal(name1,name2));
1023 }
1024
1025 /****************************************************************************
1026  Scan a directory to find a filename, matching without case sensitivity.
1027  If the name looks like a mangled name then try via the mangling functions
1028 ****************************************************************************/
1029
1030 static int get_real_filename_full_scan(connection_struct *conn,
1031                                        const char *path, const char *name,
1032                                        bool mangled,
1033                                        TALLOC_CTX *mem_ctx, char **found_name)
1034 {
1035         struct smb_Dir *cur_dir;
1036         const char *dname = NULL;
1037         char *talloced = NULL;
1038         char *unmangled_name = NULL;
1039         long curpos;
1040
1041         /* handle null paths */
1042         if ((path == NULL) || (*path == 0)) {
1043                 path = ".";
1044         }
1045
1046         /* If we have a case-sensitive filesystem, it doesn't do us any
1047          * good to search for a name. If a case variation of the name was
1048          * there, then the original stat(2) would have found it.
1049          */
1050         if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1051                 errno = ENOENT;
1052                 return -1;
1053         }
1054
1055         /*
1056          * The incoming name can be mangled, and if we de-mangle it
1057          * here it will not compare correctly against the filename (name2)
1058          * read from the directory and then mangled by the name_to_8_3()
1059          * call. We need to mangle both names or neither.
1060          * (JRA).
1061          *
1062          * Fix for bug found by Dina Fine. If in case sensitive mode then
1063          * the mangle cache is no good (3 letter extension could be wrong
1064          * case - so don't demangle in this case - leave as mangled and
1065          * allow the mangling of the directory entry read (which is done
1066          * case insensitively) to match instead. This will lead to more
1067          * false positive matches but we fail completely without it. JRA.
1068          */
1069
1070         if (mangled && !conn->case_sensitive) {
1071                 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1072                                                        &unmangled_name,
1073                                                        conn->params);
1074                 if (!mangled) {
1075                         /* Name is now unmangled. */
1076                         name = unmangled_name;
1077                 }
1078         }
1079
1080         /* open the directory */
1081         if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1082                 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1083                 TALLOC_FREE(unmangled_name);
1084                 return -1;
1085         }
1086
1087         /* now scan for matching names */
1088         curpos = 0;
1089         while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1090
1091                 /* Is it dot or dot dot. */
1092                 if (ISDOT(dname) || ISDOTDOT(dname)) {
1093                         TALLOC_FREE(talloced);
1094                         continue;
1095                 }
1096
1097                 /*
1098                  * At this point dname is the unmangled name.
1099                  * name is either mangled or not, depending on the state
1100                  * of the "mangled" variable. JRA.
1101                  */
1102
1103                 /*
1104                  * Check mangled name against mangled name, or unmangled name
1105                  * against unmangled name.
1106                  */
1107
1108                 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1109                         fname_equal(name, dname, conn->case_sensitive)) {
1110                         /* we've found the file, change it's name and return */
1111                         *found_name = talloc_strdup(mem_ctx, dname);
1112                         TALLOC_FREE(unmangled_name);
1113                         TALLOC_FREE(cur_dir);
1114                         if (!*found_name) {
1115                                 errno = ENOMEM;
1116                                 TALLOC_FREE(talloced);
1117                                 return -1;
1118                         }
1119                         TALLOC_FREE(talloced);
1120                         return 0;
1121                 }
1122                 TALLOC_FREE(talloced);
1123         }
1124
1125         TALLOC_FREE(unmangled_name);
1126         TALLOC_FREE(cur_dir);
1127         errno = ENOENT;
1128         return -1;
1129 }
1130
1131 /****************************************************************************
1132  Wrapper around the vfs get_real_filename and the full directory scan
1133  fallback.
1134 ****************************************************************************/
1135
1136 int get_real_filename(connection_struct *conn, const char *path,
1137                       const char *name, TALLOC_CTX *mem_ctx,
1138                       char **found_name)
1139 {
1140         int ret;
1141         bool mangled;
1142
1143         mangled = mangle_is_mangled(name, conn->params);
1144
1145         if (mangled) {
1146                 return get_real_filename_full_scan(conn, path, name, mangled,
1147                                                    mem_ctx, found_name);
1148         }
1149
1150         /* Try the vfs first to take advantage of case-insensitive stat. */
1151         ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1152
1153         /*
1154          * If the case-insensitive stat was successful, or returned an error
1155          * other than EOPNOTSUPP then there is no need to fall back on the
1156          * full directory scan.
1157          */
1158         if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1159                 return ret;
1160         }
1161
1162         return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1163                                            found_name);
1164 }
1165
1166 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1167                                   connection_struct *conn,
1168                                   const char *orig_path,
1169                                   struct smb_filename *smb_fname)
1170 {
1171         NTSTATUS status;
1172         unsigned int i, num_streams = 0;
1173         struct stream_struct *streams = NULL;
1174
1175         if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1176                 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1177                 return NT_STATUS_OK;
1178         }
1179
1180         if (errno != ENOENT) {
1181                 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1182                 status = map_nt_error_from_unix(errno);
1183                 goto fail;
1184         }
1185
1186         /* Fall back to a case-insensitive scan of all streams on the file. */
1187         status = SMB_VFS_STREAMINFO(conn, NULL, smb_fname->base_name, mem_ctx,
1188                                     &num_streams, &streams);
1189
1190         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1191                 SET_STAT_INVALID(smb_fname->st);
1192                 return NT_STATUS_OK;
1193         }
1194
1195         if (!NT_STATUS_IS_OK(status)) {
1196                 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1197                 goto fail;
1198         }
1199
1200         for (i=0; i<num_streams; i++) {
1201                 DEBUG(10, ("comparing [%s] and [%s]: ",
1202                            smb_fname->stream_name, streams[i].name));
1203                 if (fname_equal(smb_fname->stream_name, streams[i].name,
1204                                 conn->case_sensitive)) {
1205                         DEBUGADD(10, ("equal\n"));
1206                         break;
1207                 }
1208                 DEBUGADD(10, ("not equal\n"));
1209         }
1210
1211         /* Couldn't find the stream. */
1212         if (i == num_streams) {
1213                 SET_STAT_INVALID(smb_fname->st);
1214                 TALLOC_FREE(streams);
1215                 return NT_STATUS_OK;
1216         }
1217
1218         DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1219                 smb_fname->stream_name, streams[i].name));
1220
1221
1222         TALLOC_FREE(smb_fname->stream_name);
1223         smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1224         if (smb_fname->stream_name == NULL) {
1225                 status = NT_STATUS_NO_MEMORY;
1226                 goto fail;
1227         }
1228
1229         SET_STAT_INVALID(smb_fname->st);
1230
1231         if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1232                 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1233         }
1234         status = NT_STATUS_OK;
1235  fail:
1236         TALLOC_FREE(streams);
1237         return status;
1238 }
1239
1240 /**
1241  * Go through all the steps to validate a filename.
1242  *
1243  * @param ctx           talloc_ctx to allocate memory with.
1244  * @param conn          connection struct for vfs calls.
1245  * @param dfs_path      Whether this path requires dfs resolution.
1246  * @param name_in       The unconverted name.
1247  * @param ucf_flags     flags to pass through to unix_convert().
1248  *                      UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1249  *                      p_cont_wcard != NULL and is true and
1250  *                      UCF_COND_ALLOW_WCARD_LCOMP.
1251  * @param p_cont_wcard  If not NULL, will be set to true if the dfs path
1252  *                      resolution detects a wildcard.
1253  * @param pp_smb_fname  The final converted name will be allocated if the
1254  *                      return is NT_STATUS_OK.
1255  *
1256  * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1257  *         error otherwise.
1258  */
1259 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1260                                 connection_struct *conn,
1261                                 bool dfs_path,
1262                                 const char *name_in,
1263                                 uint32_t ucf_flags,
1264                                 bool *ppath_contains_wcard,
1265                                 struct smb_filename **pp_smb_fname)
1266 {
1267         NTSTATUS status;
1268         bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1269         char *fname = NULL;
1270
1271         *pp_smb_fname = NULL;
1272
1273         status = resolve_dfspath_wcard(ctx, conn,
1274                                 dfs_path,
1275                                 name_in,
1276                                 allow_wcards,
1277                                 &fname,
1278                                 ppath_contains_wcard);
1279         if (!NT_STATUS_IS_OK(status)) {
1280                 DEBUG(10,("filename_convert: resolve_dfspath failed "
1281                         "for name %s with %s\n",
1282                         name_in,
1283                         nt_errstr(status) ));
1284                 return status;
1285         }
1286
1287         if (is_fake_file_path(name_in)) {
1288                 SMB_STRUCT_STAT st;
1289                 ZERO_STRUCT(st);
1290                 st.st_ex_nlink = 1;
1291                 status = create_synthetic_smb_fname_split(ctx,
1292                                                           name_in,
1293                                                           &st,
1294                                                           pp_smb_fname);
1295                 return status;
1296         }
1297
1298         /*
1299          * If the caller conditionally allows wildcard lookups, only add the
1300          * always allow if the path actually does contain a wildcard.
1301          */
1302         if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1303             ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1304                 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1305         }
1306
1307         status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1308         if (!NT_STATUS_IS_OK(status)) {
1309                 DEBUG(10,("filename_convert: unix_convert failed "
1310                         "for name %s with %s\n",
1311                         fname,
1312                         nt_errstr(status) ));
1313                 return status;
1314         }
1315
1316         status = check_name(conn, (*pp_smb_fname)->base_name);
1317         if (!NT_STATUS_IS_OK(status)) {
1318                 DEBUG(3,("filename_convert: check_name failed "
1319                         "for name %s with %s\n",
1320                         smb_fname_str_dbg(*pp_smb_fname),
1321                         nt_errstr(status) ));
1322                 TALLOC_FREE(*pp_smb_fname);
1323                 return status;
1324         }
1325
1326         return status;
1327 }