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, ENOTDIR and ELOOP all map to
 396                                          * NT_STATUS_OBJECT_PATH_NOT_FOUND
 397                                          * in the filename walk. */
 398
 399                                         if (errno == ENOENT ||
 400                                                         errno == ENOTDIR ||
 401                                                         errno == ELOOP) {
 402                                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 403                                         }
 404                                         return map_nt_error_from_unix(errno);
 405                                 }
 406
 407                                 /* ENOENT is the only valid error here. */
 408                                 if (errno != ENOENT) {
 409                                         /* ENOTDIR and ELOOP both map to
 410                                          * NT_STATUS_OBJECT_PATH_NOT_FOUND
 411                                          * in the filename walk. */
 412                                         if (errno == ENOTDIR ||
 413                                                         errno == ELOOP) {
 414                                                 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
 415                                         }
 416                                         return map_nt_error_from_unix(errno);
 417                                 }
 418
 419                                 /*
 420                                  * Just the last part of the name doesn't exist.
 421                                  * We need to strupper() or strlower() it as
 422                                  * this conversion may be used for file creation
 423                                  * purposes. Fix inspired by Thomas Neumann <t.neumann@iku-ag.de>.
 424                                  */
 425                                 if (!conn->case_preserve ||
 426                                     (mangle_is_8_3(start, False, conn->params) &&
 427                                                  !conn->short_case_preserve)) {
 428                                         strnorm(start, lp_defaultcase(SNUM(conn)));
 429                                 }
 430
 431                                 /*
 432                                  * check on the mangled stack to see if we can recover the
 433                                  * base of the filename.
 434                                  */
 435
 436                                 if (mangle_is_mangled(start, conn->params)) {
 437                                         mangle_check_cache( start, sizeof(pstring) - 1 - (start - name), conn->params);
 438                                 }
 439
 440                                 DEBUG(5,("New file %s\n",start));
 441                                 return NT_STATUS_OK;
 442                         }
 443
 444                         /*
 445                          * Restore the rest of the string. If the string was mangled the size
 446                          * may have changed.
 447                          */
 448                         if (end) {
 449                                 end = start + strlen(start);
 450                                 if (!safe_strcat(start, "/", sizeof(pstring) - 1 - (start - name)) ||
 451                                     !safe_strcat(start, rest, sizeof(pstring) - 1 - (start - name))) {
 452                                         return map_nt_error_from_unix(ENAMETOOLONG);
 453                                 }
 454                                 *end = '\0';
 455                         } else {
 456                                 /*
 457                                  * We just scanned for, and found the end of the path.
 458                                  * We must return a valid stat struct if it exists.
 459                                  * JRA.
 460                                  */
 461
 462                                 if (SMB_VFS_STAT(conn,name, &st) == 0) {
 463                                         *pst = st;
 464                                 } else {
 465                                         SET_STAT_INVALID(st);
 466                                 }
 467                         }
 468                 } /* end else */
 469
 470 #ifdef DEVELOPER
 471                 if (VALID_STAT(st) && get_delete_on_close_flag(st.st_dev, st.st_ino)) {
 472                         return NT_STATUS_DELETE_PENDING;
 473                 }
 474 #endif
 475
 476                 /*
 477                  * Add to the dirpath that we have resolved so far.
 478                  */
 479                 if (*dirpath) {
 480                         pstrcat(dirpath,"/");
 481                 }
 482
 483                 pstrcat(dirpath,start);
 484
 485                 /*
 486                  * Don't cache a name with mangled or wildcard components
 487                  * as this can change the size.
 488                  */
 489
 490                 if(!component_was_mangled && !name_has_wildcard) {
 491                         stat_cache_add(orig_path, dirpath, conn->case_sensitive);
 492                 }
 493
 494                 /*
 495                  * Restore the / that we wiped out earlier.
 496                  */
 497                 if (end) {
 498                         *end = '/';
 499                 }
 500         }
 501
 502         /*
 503          * Don't cache a name with mangled or wildcard components
 504          * as this can change the size.
 505          */
 506
 507         if(!component_was_mangled && !name_has_wildcard) {
 508                 stat_cache_add(orig_path, name, conn->case_sensitive);
 509         }
 510
 511         /*
 512          * The name has been resolved.
 513          */
 514
 515         DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
 516         return NT_STATUS_OK;
 517 }
 518
 519 /****************************************************************************
 520  Check a filename - possibly caling reducename.
 521  This is called by every routine before it allows an operation on a filename.
 522  It does any final confirmation necessary to ensure that the filename is
 523  a valid one for the user to access.
 524 ****************************************************************************/
 525
 526 NTSTATUS check_name(connection_struct *conn, const pstring name)
 527 {
 528         if (IS_VETO_PATH(conn, name))  {
 529                 /* Is it not dot or dot dot. */
 530                 if (!((name[0] == '.') && (!name[1] || (name[1] == '.' && !name[2])))) {
 531                         DEBUG(5,("check_name: file path name %s vetoed\n",name));
 532                         return map_nt_error_from_unix(ENOENT);
 533                 }
 534         }
 535
 536         if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
 537                 NTSTATUS status = reduce_name(conn,name);
 538                 if (!NT_STATUS_IS_OK(status)) {
 539                         DEBUG(5,("check_name: name %s failed with %s\n",name, nt_errstr(status)));
 540                         return status;
 541                 }
 542         }
 543
 544         return NT_STATUS_OK;
 545 }
 546
 547 /****************************************************************************
 548  Scan a directory to find a filename, matching without case sensitivity.
 549  If the name looks like a mangled name then try via the mangling functions
 550 ****************************************************************************/
 551
 552 static BOOL scan_directory(connection_struct *conn, const char *path, char *name, size_t maxlength)
 553 {
 554         struct smb_Dir *cur_dir;
 555         const char *dname;
 556         BOOL mangled;
 557         long curpos;
 558
 559         mangled = mangle_is_mangled(name, conn->params);
 560
 561         /* handle null paths */
 562         if (*path == 0)
 563                 path = ".";
 564
 565         /*
 566          * The incoming name can be mangled, and if we de-mangle it
 567          * here it will not compare correctly against the filename (name2)
 568          * read from the directory and then mangled by the mangle_map()
 569          * call. We need to mangle both names or neither.
 570          * (JRA).
 571          *
 572          * Fix for bug found by Dina Fine. If in case sensitive mode then
 573          * the mangle cache is no good (3 letter extension could be wrong
 574          * case - so don't demangle in this case - leave as mangled and
 575          * allow the mangling of the directory entry read (which is done
 576          * case insensitively) to match instead. This will lead to more
 577          * false positive matches but we fail completely without it. JRA.
 578          */
 579
 580         if (mangled && !conn->case_sensitive) {
 581                 mangled = !mangle_check_cache( name, maxlength, conn->params);
 582         }
 583
 584         /* open the directory */
 585         if (!(cur_dir = OpenDir(conn, path, NULL, 0))) {
 586                 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
 587                 return(False);
 588         }
 589
 590         /* now scan for matching names */
 591         curpos = 0;
 592         while ((dname = ReadDirName(cur_dir, &curpos))) {
 593
 594                 /* Is it dot or dot dot. */
 595                 if ((dname[0] == '.') && (!dname[1] || (dname[1] == '.' && !dname[2]))) {
 596                         continue;
 597                 }
 598
 599                 /*
 600                  * At this point dname is the unmangled name.
 601                  * name is either mangled or not, depending on the state of the "mangled"
 602                  * variable. JRA.
 603                  */
 604
 605                 /*
 606                  * Check mangled name against mangled name, or unmangled name
 607                  * against unmangled name.
 608                  */
 609
 610                 if ((mangled && mangled_equal(name,dname,conn->params)) || fname_equal(name, dname, conn->case_sensitive)) {
 611                         /* we've found the file, change it's name and return */
 612                         safe_strcpy(name, dname, maxlength);
 613                         CloseDir(cur_dir);
 614                         return(True);
 615                 }
 616         }
 617
 618         CloseDir(cur_dir);
 619         errno = ENOENT;
 620         return(False);
 621 }