source/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 1999-2004
   6    Copyright (C) Ying Chen 2000
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 /*
  24  * New hash table stat cache code added by Ying Chen.
  25  */
  26
  27 #include "includes.h"
  28
  29 static BOOL scan_directory(connection_struct *conn, const char *path, char *name,size_t maxlength);
  30
  31 /****************************************************************************
  32  Check if two filenames are equal.
  33  This needs to be careful about whether we are case sensitive.
  34 ****************************************************************************/
  35
  36 static BOOL fname_equal(const char *name1, const char *name2, BOOL case_sensitive)
  37 {
  38         /* Normal filename handling */
  39         if (case_sensitive)
  40                 return(strcmp(name1,name2) == 0);
  41
  42         return(strequal(name1,name2));
  43 }
  44
  45 /****************************************************************************
  46  Mangle the 2nd name and check if it is then equal to the first name.
  47 ****************************************************************************/
  48
  49 static BOOL mangled_equal(const char *name1, const char *name2,
  50                           const struct share_params *p)
  51 {
  52         pstring tmpname;
  53
  54         pstrcpy(tmpname, name2);
  55         mangle_map(tmpname, True, False, p);
  56         return strequal(name1, tmpname);
  57 }
  58
  59 /****************************************************************************
  60  Cope with the differing wildcard and non-wildcard error cases.
  61 ****************************************************************************/
  62
  63 static NTSTATUS determine_path_error(const char *name, BOOL allow_wcard_last_component)
  64 {
  65         const char *p;
  66
  67         if (!allow_wcard_last_component) {
  68                 /* Error code within a pathname. */
  69                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
  70         }
  71
  72         /* We're terminating here so we
  73          * can be a little slower and get
  74          * the error code right. Windows
  75          * treats the last part of the pathname
  76          * separately I think, so if the last
  77          * component is a wildcard then we treat
  78          * this ./ as "end of component" */
  79
  80         p = strchr(name, '/');
  81
  82         if (!p && (ms_has_wild(name) || ISDOT(name))) {
  83                 /* Error code at the end of a pathname. */
  84                 return NT_STATUS_OBJECT_NAME_INVALID;
  85         } else {
  86                 /* Error code within a pathname. */
  87                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
  88         }
  89 }
  90
  91 /****************************************************************************
  92 This routine is called to convert names from the dos namespace to unix
  93 namespace. It needs to handle any case conversions, mangling, format
  94 changes etc.
  95
  96 We assume that we have already done a chdir() to the right "root" directory
  97 for this service.
  98
  99 The function will return an NTSTATUS error if some part of the name except for the last
 100 part cannot be resolved, else NT_STATUS_OK.
 101
 102 Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we didn't
 103 get any fatal errors that should immediately terminate the calling
 104 SMB processing whilst resolving.
 105
 106 If the saved_last_component != 0, then the unmodified last component
 107 of the pathname is returned there. This is used in an exceptional
 108 case in reply_mv (so far). If saved_last_component == 0 then nothing
 109 is returned there.
 110
 111 If last_component_wcard is true then a MS wildcard was detected and
 112 should be allowed in the last component of the path only.
 113
 114 On exit from unix_convert, if *pst was not null, then the file stat
 115 struct will be returned if the file exists and was found, if not this
 116 stat struct will be filled with zeros (and this can be detected by checking
 117 for nlinks = 0, which can never be true for any file).
 118 ****************************************************************************/
 119
 120 NTSTATUS unix_convert(connection_struct *conn,
 121                         pstring name,
 122                         BOOL allow_wcard_last_component,
 123                         char *saved_last_component,
 124                         SMB_STRUCT_STAT *pst)
 125 {
 126         SMB_STRUCT_STAT st;
 127         char *start, *end;
 128         pstring dirpath;
 129         pstring orig_path;
 130         BOOL component_was_mangled = False;
 131         BOOL name_has_wildcard = False;
 132
 133         SET_STAT_INVALID(*pst);
 134
 135         *dirpath = 0;
 136
 137         if(saved_last_component) {
 138                 *saved_last_component = 0;
 139         }
 140
 141         if (conn->printer) {
 142                 /* we don't ever use the filenames on a printer share as a
 143                         filename - so don't convert them */
 144                 return NT_STATUS_OK;
 145         }
 146
 147         DEBUG(5, ("unix_convert called on file \"%s\"\n", name));
 148
 149         /*
 150          * Conversion to basic unix format is already done in check_path_syntax().
 151          */
 152
 153         /*
 154          * Names must be relative to the root of the service - any leading /.
 155          * and trailing /'s should have been trimmed by check_path_syntax().
 156          */
 157
 158 #ifdef DEVELOPER
 159         SMB_ASSERT(*name != '/');
 160 #endif
 161
 162         /*
 163          * If we trimmed down to a single '\0' character
 164          * then we should use the "." directory to avoid
 165          * searching the cache, but not if we are in a
 166          * printing share.
 167          * As we know this is valid we can return true here.
 168          */
 169
 170         if (!*name) {
 171                 name[0] = '.';
 172                 name[1] = '\0';
 173                 if (SMB_VFS_STAT(conn,name,&st) == 0) {
 174                         *pst = st;
 175                 }
 176                 DEBUG(5,("conversion finished \"\" -> %s\n",name));
 177                 return NT_STATUS_OK;
 178         }
 179
 180         if (name[0] == '.' && (name[1] == '/' || name[1] == '\0')) {
 181                 /* Start of pathname can't be "." only. */
 182                 if (name[1] == '\0' || name[2] == '\0') {
 183                         return NT_STATUS_OBJECT_NAME_INVALID;
 184                 } else {
 185                         return determine_path_error(&name[2], allow_wcard_last_component);
 186                 }
 187         }
 188
 189         /*
 190          * Ensure saved_last_component is valid even if file exists.
 191          */
 192
 193         if(saved_last_component) {
 194                 end = strrchr_m(name, '/');
 195                 if (end) {
 196                         pstrcpy(saved_last_component, end + 1);
 197                 } else {
 198                         pstrcpy(saved_last_component, name);
 199                 }
 200         }
 201
 202         /*
 203          * Large directory fix normalization. If we're case sensitive, and
 204          * the case preserving parameters are set to "no", normalize the case of
 205          * the incoming filename from the client WHETHER IT EXISTS OR NOT !
 206          * This is in conflict with the current (3.0.20) man page, but is
 207          * what people expect from the "large directory howto". I'll update
 208          * the man page. Thanks to jht@samba.org for finding this. JRA.
 209          */
 210
 211         if (conn->case_sensitive && !conn->case_preserve && !conn->short_case_preserve) {
 212                 strnorm(name, lp_defaultcase(SNUM(conn)));
 213         }
 214
 215         start = name;
 216         pstrcpy(orig_path, name);
 217
 218         if(!conn->case_sensitive && stat_cache_lookup(conn, name, dirpath, &start, &st)) {
 219                 *pst = st;
 220                 return NT_STATUS_OK;
 221         }
 222
 223         /*
 224          * stat the name - if it exists then we are all done!
 225          */
 226
 227         if (SMB_VFS_STAT(conn,name,&st) == 0) {
 228                 /* Ensure we catch all names with in "/."
 229                    this is disallowed under Windows. */
 230                 const char *p = strstr(name, "/."); /* mb safe. */
 231                 if (p) {
 232                         if (p[2] == '/') {
 233                                 /* Error code within a pathname. */
 234                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 235                         } else if (p[2] == '\0') {
 236                                 /* Error code at the end of a pathname. */
 237                                 return NT_STATUS_OBJECT_NAME_INVALID;
 238                         }
 239                 }
 240                 stat_cache_add(orig_path, name, conn->case_sensitive);
 241                 DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
 242                 *pst = st;
 243                 return NT_STATUS_OK;
 244         }
 245
 246         DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n", name, dirpath, start));
 247
 248         /*
 249          * A special case - if we don't have any mangling chars and are case
 250          * sensitive then searching won't help.
 251          */
 252
 253         if (conn->case_sensitive &&
 254                         !mangle_is_mangled(name, conn->params) &&
 255                         !*lp_mangled_map(conn->params)) {
 256                 return NT_STATUS_OK;
 257         }
 258
 259         /*
 260          * is_mangled() was changed to look at an entire pathname, not
 261          * just a component. JRA.
 262          */
 263
 264         if (mangle_is_mangled(start, conn->params)) {
 265                 component_was_mangled = True;
 266         }
 267
 268         /*
 269          * Now we need to recursively match the name against the real
 270          * directory structure.
 271          */
 272
 273         /*
 274          * Match each part of the path name separately, trying the names
 275          * as is first, then trying to scan the directory for matching names.
 276          */
 277
 278         for (; start ; start = (end?end+1:(char *)NULL)) {
 279                 /*
 280                  * Pinpoint the end of this section of the filename.
 281                  */
 282                 end = strchr(start, '/'); /* mb safe. '/' can't be in any encoded char. */
 283
 284                 /*
 285                  * Chop the name at this point.
 286                  */
 287                 if (end) {
 288                         *end = 0;
 289                 }
 290
 291                 if (saved_last_component != 0) {
 292                         pstrcpy(saved_last_component, end ? end + 1 : start);
 293                 }
 294
 295                 /* The name cannot have a component of "." */
 296
 297                 if (ISDOT(start)) {
 298                         if (!end)  {
 299                                 /* Error code at the end of a pathname. */
 300                                 return NT_STATUS_OBJECT_NAME_INVALID;
 301                         }
 302                         return determine_path_error(end+1, allow_wcard_last_component);
 303                 }
 304
 305                 /* The name cannot have a wildcard if it's not
 306                    the last component. */
 307
 308                 name_has_wildcard = ms_has_wild(start);
 309
 310                 /* Wildcard not valid anywhere. */
 311                 if (name_has_wildcard && !allow_wcard_last_component) {
 312                         return NT_STATUS_OBJECT_NAME_INVALID;
 313                 }
 314
 315                 /* Wildcards never valid within a pathname. */
 316                 if (name_has_wildcard && end) {
 317                         return NT_STATUS_OBJECT_NAME_INVALID;
 318                 }
 319
 320                 /*
 321                  * Check if the name exists up to this point.
 322                  */
 323
 324                 if (SMB_VFS_STAT(conn,name, &st) == 0) {
 325                         /*
 326                          * It exists. it must either be a directory or this must be
 327                          * the last part of the path for it to be OK.
 328                          */
 329                         if (end && !(st.st_mode & S_IFDIR)) {
 330                                 /*
 331                                  * An intermediate part of the name isn't a directory.
 332                                  */
 333                                 DEBUG(5,("Not a dir %s\n",start));
 334                                 *end = '/';
 335                                 /*
 336                                  * We need to return the fact that the intermediate
 337                                  * name resolution failed. This is used to return an
 338                                  * error of ERRbadpath rather than ERRbadfile. Some
 339                                  * Windows applications depend on the difference between
 340                                  * these two errors.
 341                                  */
 342                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 343                         }
 344
 345                         if (!end) {
 346                                 /*
 347                                  * We just scanned for, and found the end of the path.
 348                                  * We must return the valid stat struct.
 349                                  * JRA.
 350                                  */
 351
 352                                 *pst = st;
 353                         }
 354
 355                 } else {
 356                         pstring rest;
 357
 358                         /* Stat failed - ensure we don't use it. */
 359                         SET_STAT_INVALID(st);
 360                         *rest = 0;
 361
 362                         /*
 363                          * Remember the rest of the pathname so it can be restored
 364                          * later.
 365                          */
 366
 367                         if (end) {
 368                                 pstrcpy(rest,end+1);
 369                         }
 370
 371                         /* Reset errno so we can detect directory open errors. */
 372                         errno = 0;
 373
 374                         /*
 375                          * Try to find this part of the path in the directory.
 376                          */
 377
 378                         if (name_has_wildcard ||
 379                             !scan_directory(conn, dirpath, start, sizeof(pstring) - 1 - (start - name))) {
 380                                 if (end) {
 381                                         /*
 382                                          * An intermediate part of the name can't be found.
 383                                          */
 384                                         DEBUG(5,("Intermediate not found %s\n",start));
 385                                         *end = '/';
 386
 387                                         /*
 388                                          * We need to return the fact that the intermediate
 389                                          * name resolution failed. This is used to return an
 390                                          * error of ERRbadpath rather than ERRbadfile. Some
 391                                          * Windows applications depend on the difference between
 392                                          * these two errors.
 393                                          */
 394
 395                                         /* ENOENT and ENOTDIR both map to NT_STATUS_OBJECT_PATH_NOT_FOUND
 396                                            in the filename walk. */
 397
 398                                         if (errno == ENOENT || errno == ENOTDIR) {
 399                                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 400                                         }
 401                                         return map_nt_error_from_unix(errno);
 402                                 }
 403
 404                                 /* ENOENT is the only valid error here. */
 405                                 if (errno != ENOENT) {
 406                                         /* ENOENT and ENOTDIR both map to NT_STATUS_OBJECT_PATH_NOT_FOUND
 407                                            in the filename walk. */
 408                                         if (errno == ENOTDIR) {
 409                                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 410                                         }
 411                                         return map_nt_error_from_unix(errno);
 412                                 }
 413
 414                                 /*
 415                                  * Just the last part of the name doesn't exist.
 416                                  * We need to strupper() or strlower() it as
 417                                  * this conversion may be used for file creation
 418                                  * purposes. Fix inspired by Thomas Neumann <t.neumann@iku-ag.de>.
 419                                  */
 420                                 if (!conn->case_preserve ||
 421                                     (mangle_is_8_3(start, False, conn->params) &&
 422                                                  !conn->short_case_preserve)) {
 423                                         strnorm(start, lp_defaultcase(SNUM(conn)));
 424                                 }
 425
 426                                 /*
 427                                  * check on the mangled stack to see if we can recover the
 428                                  * base of the filename.
 429                                  */
 430
 431                                 if (mangle_is_mangled(start, conn->params)) {
 432                                         mangle_check_cache( start, sizeof(pstring) - 1 - (start - name), conn->params);
 433                                 }
 434
 435                                 DEBUG(5,("New file %s\n",start));
 436                                 return NT_STATUS_OK;
 437                         }
 438
 439                         /*
 440                          * Restore the rest of the string. If the string was mangled the size
 441                          * may have changed.
 442                          */
 443                         if (end) {
 444                                 end = start + strlen(start);
 445                                 if (!safe_strcat(start, "/", sizeof(pstring) - 1 - (start - name)) ||
 446                                     !safe_strcat(start, rest, sizeof(pstring) - 1 - (start - name))) {
 447                                         return map_nt_error_from_unix(ENAMETOOLONG);
 448                                 }
 449                                 *end = '\0';
 450                         } else {
 451                                 /*
 452                                  * We just scanned for, and found the end of the path.
 453                                  * We must return a valid stat struct if it exists.
 454                                  * JRA.
 455                                  */
 456
 457                                 if (SMB_VFS_STAT(conn,name, &st) == 0) {
 458                                         *pst = st;
 459                                 } else {
 460                                         SET_STAT_INVALID(st);
 461                                 }
 462                         }
 463                 } /* end else */
 464
 465 #ifdef DEVELOPER
 466                 if (VALID_STAT(st) && get_delete_on_close_flag(file_id_sbuf(&st))) {
 467                         return NT_STATUS_DELETE_PENDING;
 468                 }
 469 #endif
 470
 471                 /*
 472                  * Add to the dirpath that we have resolved so far.
 473                  */
 474                 if (*dirpath) {
 475                         pstrcat(dirpath,"/");
 476                 }
 477
 478                 pstrcat(dirpath,start);
 479
 480                 /*
 481                  * Don't cache a name with mangled or wildcard components
 482                  * as this can change the size.
 483                  */
 484
 485                 if(!component_was_mangled && !name_has_wildcard) {
 486                         stat_cache_add(orig_path, dirpath, conn->case_sensitive);
 487                 }
 488
 489                 /*
 490                  * Restore the / that we wiped out earlier.
 491                  */
 492                 if (end) {
 493                         *end = '/';
 494                 }
 495         }
 496
 497         /*
 498          * Don't cache a name with mangled or wildcard components
 499          * as this can change the size.
 500          */
 501
 502         if(!component_was_mangled && !name_has_wildcard) {
 503                 stat_cache_add(orig_path, name, conn->case_sensitive);
 504         }
 505
 506         /*
 507          * The name has been resolved.
 508          */
 509
 510         DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
 511         return NT_STATUS_OK;
 512 }
 513
 514 /****************************************************************************
 515  Check a filename - possibly calling check_reduced_name.
 516  This is called by every routine before it allows an operation on a filename.
 517  It does any final confirmation necessary to ensure that the filename is
 518  a valid one for the user to access.
 519 ****************************************************************************/
 520
 521 NTSTATUS check_name(connection_struct *conn, const pstring name)
 522 {
 523         if (IS_VETO_PATH(conn, name))  {
 524                 /* Is it not dot or dot dot. */
 525                 if (!((name[0] == '.') && (!name[1] || (name[1] == '.' && !name[2])))) {
 526                         DEBUG(5,("check_name: file path name %s vetoed\n",name));
 527                         return map_nt_error_from_unix(ENOENT);
 528                 }
 529         }
 530
 531         if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
 532                 NTSTATUS status = check_reduced_name(conn,name);
 533                 if (!NT_STATUS_IS_OK(status)) {
 534                         DEBUG(5,("check_name: name %s failed with %s\n",name, nt_errstr(status)));
 535                         return status;
 536                 }
 537         }
 538
 539         return NT_STATUS_OK;
 540 }
 541
 542 /****************************************************************************
 543  Scan a directory to find a filename, matching without case sensitivity.
 544  If the name looks like a mangled name then try via the mangling functions
 545 ****************************************************************************/
 546
 547 static BOOL scan_directory(connection_struct *conn, const char *path, char *name, size_t maxlength)
 548 {
 549         struct smb_Dir *cur_dir;
 550         const char *dname;
 551         BOOL mangled;
 552         long curpos;
 553
 554         mangled = mangle_is_mangled(name, conn->params);
 555
 556         /* handle null paths */
 557         if (*path == 0)
 558                 path = ".";
 559
 560         /*
 561          * The incoming name can be mangled, and if we de-mangle it
 562          * here it will not compare correctly against the filename (name2)
 563          * read from the directory and then mangled by the mangle_map()
 564          * call. We need to mangle both names or neither.
 565          * (JRA).
 566          *
 567          * Fix for bug found by Dina Fine. If in case sensitive mode then
 568          * the mangle cache is no good (3 letter extension could be wrong
 569          * case - so don't demangle in this case - leave as mangled and
 570          * allow the mangling of the directory entry read (which is done
 571          * case insensitively) to match instead. This will lead to more
 572          * false positive matches but we fail completely without it. JRA.
 573          */
 574
 575         if (mangled && !conn->case_sensitive) {
 576                 mangled = !mangle_check_cache( name, maxlength, conn->params);
 577         }
 578
 579         /* open the directory */
 580         if (!(cur_dir = OpenDir(conn, path, NULL, 0))) {
 581                 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
 582                 return(False);
 583         }
 584
 585         /* now scan for matching names */
 586         curpos = 0;
 587         while ((dname = ReadDirName(cur_dir, &curpos))) {
 588
 589                 /* Is it dot or dot dot. */
 590                 if ((dname[0] == '.') && (!dname[1] || (dname[1] == '.' && !dname[2]))) {
 591                         continue;
 592                 }
 593
 594                 /*
 595                  * At this point dname is the unmangled name.
 596                  * name is either mangled or not, depending on the state of the "mangled"
 597                  * variable. JRA.
 598                  */
 599
 600                 /*
 601                  * Check mangled name against mangled name, or unmangled name
 602                  * against unmangled name.
 603                  */
 604
 605                 if ((mangled && mangled_equal(name,dname,conn->params)) || fname_equal(name, dname, conn->case_sensitive)) {
 606                         /* we've found the file, change it's name and return */
 607                         safe_strcpy(name, dname, maxlength);
 608                         CloseDir(cur_dir);
 609                         return(True);
 610                 }
 611         }
 612
 613         CloseDir(cur_dir);
 614         errno = ENOENT;
 615         return(False);
 616 }