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