release/src/router/samba3/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, int snum)
  50 {
  51         pstring tmpname;
  52
  53         pstrcpy(tmpname, name2);
  54         mangle_map(tmpname, True, False, snum);
  55         return strequal(name1, tmpname);
  56 }
  57
  58 /****************************************************************************
  59 This routine is called to convert names from the dos namespace to unix
  60 namespace. It needs to handle any case conversions, mangling, format
  61 changes etc.
  62
  63 We assume that we have already done a chdir() to the right "root" directory
  64 for this service.
  65
  66 The function will return False if some part of the name except for the last
  67 part cannot be resolved
  68
  69 If the saved_last_component != 0, then the unmodified last component
  70 of the pathname is returned there. This is used in an exceptional
  71 case in reply_mv (so far). If saved_last_component == 0 then nothing
  72 is returned there.
  73
  74 The bad_path arg is set to True if the filename walk failed. This is
  75 used to pick the correct error code to return between ENOENT and ENOTDIR
  76 as Windows applications depend on ERRbadpath being returned if a component
  77 of a pathname does not exist.
  78
  79 On exit from unix_convert, if *pst was not null, then the file stat
  80 struct will be returned if the file exists and was found, if not this
  81 stat struct will be filled with zeros (and this can be detected by checking
  82 for nlinks = 0, which can never be true for any file).
  83 ****************************************************************************/
  84
  85 BOOL unix_convert(pstring name,connection_struct *conn,char *saved_last_component,
  86                   BOOL *bad_path, SMB_STRUCT_STAT *pst)
  87 {
  88         SMB_STRUCT_STAT st;
  89         char *start, *end;
  90         pstring dirpath;
  91         pstring orig_path;
  92         BOOL component_was_mangled = False;
  93         BOOL name_has_wildcard = False;
  94
  95         SET_STAT_INVALID(*pst);
  96
  97         *dirpath = 0;
  98         *bad_path = False;
  99         if(saved_last_component)
 100                 *saved_last_component = 0;
 101
 102         if (conn->printer) {
 103                 /* we don't ever use the filenames on a printer share as a
 104                         filename - so don't convert them */
 105                 return True;
 106         }
 107
 108         DEBUG(5, ("unix_convert called on file \"%s\"\n", name));
 109
 110         /*
 111          * Conversion to basic unix format is already done in check_path_syntax().
 112          */
 113
 114         /*
 115          * Names must be relative to the root of the service - any leading /.
 116          * and trailing /'s should have been trimmed by check_path_syntax().
 117          */
 118
 119 #ifdef DEVELOPER
 120         SMB_ASSERT(*name != '/');
 121 #endif
 122
 123         /*
 124          * If we trimmed down to a single '\0' character
 125          * then we should use the "." directory to avoid
 126          * searching the cache, but not if we are in a
 127          * printing share.
 128          * As we know this is valid we can return true here.
 129          */
 130
 131         if (!*name) {
 132                 name[0] = '.';
 133                 name[1] = '\0';
 134                 if (SMB_VFS_STAT(conn,name,&st) == 0) {
 135                         *pst = st;
 136                 }
 137                 DEBUG(5,("conversion finished \"\" -> %s\n",name));
 138                 return(True);
 139         }
 140
 141         /*
 142          * Ensure saved_last_component is valid even if file exists.
 143          */
 144
 145         if(saved_last_component) {
 146                 end = strrchr_m(name, '/');
 147                 if(end)
 148                         pstrcpy(saved_last_component, end + 1);
 149                 else
 150                         pstrcpy(saved_last_component, name);
 151         }
 152
 153         /*
 154          * Large directory fix normalization. If we're case sensitive, and
 155          * the case preserving parameters are set to "no", normalize the case of
 156          * the incoming filename from the client WHETHER IT EXISTS OR NOT !
 157          * This is in conflict with the current (3.0.20) man page, but is
 158          * what people expect from the "large directory howto". I'll update
 159          * the man page. Thanks to jht@samba.org for finding this. JRA.
 160          */
 161
 162         if (conn->case_sensitive && !conn->case_preserve && !conn->short_case_preserve) {
 163                 strnorm(name, lp_defaultcase(SNUM(conn)));
 164         }
 165
 166         start = name;
 167         pstrcpy(orig_path, name);
 168
 169         if(!conn->case_sensitive && stat_cache_lookup(conn, name, dirpath, &start, &st)) {
 170                 *pst = st;
 171                 return True;
 172         }
 173
 174         /*
 175          * stat the name - if it exists then we are all done!
 176          */
 177
 178         if (SMB_VFS_STAT(conn,name,&st) == 0) {
 179                 stat_cache_add(orig_path, name, conn->case_sensitive);
 180                 DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
 181                 *pst = st;
 182                 return(True);
 183         }
 184
 185         DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n", name, dirpath, start));
 186
 187         /*
 188          * A special case - if we don't have any mangling chars and are case
 189          * sensitive then searching won't help.
 190          */
 191
 192         if (conn->case_sensitive && !mangle_is_mangled(name, SNUM(conn)) && !*lp_mangled_map(SNUM(conn)))
 193                 return(False);
 194
 195         name_has_wildcard = ms_has_wild(start);
 196
 197         /*
 198          * is_mangled() was changed to look at an entire pathname, not
 199          * just a component. JRA.
 200          */
 201
 202         if (mangle_is_mangled(start, SNUM(conn)))
 203                 component_was_mangled = True;
 204
 205         /*
 206          * Now we need to recursively match the name against the real
 207          * directory structure.
 208          */
 209
 210         /*
 211          * Match each part of the path name separately, trying the names
 212          * as is first, then trying to scan the directory for matching names.
 213          */
 214
 215         for (; start ; start = (end?end+1:(char *)NULL)) {
 216                 /*
 217                  * Pinpoint the end of this section of the filename.
 218                  */
 219                 end = strchr_m(start, '/');
 220
 221                 /*
 222                  * Chop the name at this point.
 223                  */
 224                 if (end)
 225                         *end = 0;
 226
 227                 if(saved_last_component != 0)
 228                         pstrcpy(saved_last_component, end ? end + 1 : start);
 229
 230                 /*
 231                  * Check if the name exists up to this point.
 232                  */
 233
 234                 if (SMB_VFS_STAT(conn,name, &st) == 0) {
 235                         /*
 236                          * It exists. it must either be a directory or this must be
 237                          * the last part of the path for it to be OK.
 238                          */
 239                         if (end && !(st.st_mode & S_IFDIR)) {
 240                                 /*
 241                                  * An intermediate part of the name isn't a directory.
 242                                  */
 243                                 DEBUG(5,("Not a dir %s\n",start));
 244                                 *end = '/';
 245                                 /*
 246                                  * We need to return the fact that the intermediate
 247                                  * name resolution failed. This is used to return an
 248                                  * error of ERRbadpath rather than ERRbadfile. Some
 249                                  * Windows applications depend on the difference between
 250                                  * these two errors.
 251                                  */
 252                                 errno = ENOTDIR;
 253                                 *bad_path = True;
 254                                 return(False);
 255                         }
 256
 257                         if (!end) {
 258                                 /*
 259                                  * We just scanned for, and found the end of the path.
 260                                  * We must return the valid stat struct.
 261                                  * JRA.
 262                                  */
 263
 264                                 *pst = st;
 265                         }
 266
 267                 } else {
 268                         pstring rest;
 269
 270                         /* Stat failed - ensure we don't use it. */
 271                         SET_STAT_INVALID(st);
 272                         *rest = 0;
 273
 274                         /*
 275                          * Remember the rest of the pathname so it can be restored
 276                          * later.
 277                          */
 278
 279                         if (end)
 280                                 pstrcpy(rest,end+1);
 281
 282                         /* Reset errno so we can detect directory open errors. */
 283                         errno = 0;
 284
 285                         /*
 286                          * Try to find this part of the path in the directory.
 287                          */
 288
 289                         if (ms_has_wild(start) ||
 290                             !scan_directory(conn, dirpath, start, sizeof(pstring) - 1 - (start - name))) {
 291                                 if (end) {
 292                                         /*
 293                                          * An intermediate part of the name can't be found.
 294                                          */
 295                                         DEBUG(5,("Intermediate not found %s\n",start));
 296                                         *end = '/';
 297
 298                                         /*
 299                                          * We need to return the fact that the intermediate
 300                                          * name resolution failed. This is used to return an
 301                                          * error of ERRbadpath rather than ERRbadfile. Some
 302                                          * Windows applications depend on the difference between
 303                                          * these two errors.
 304                                          */
 305                                         *bad_path = True;
 306                                         return(False);
 307                                 }
 308
 309                                 if (errno == ENOTDIR) {
 310                                         *bad_path = True;
 311                                         return(False);
 312                                 }
 313
 314                                 /*
 315                                  * Just the last part of the name doesn't exist.
 316                                  * We need to strupper() or strlower() it as
 317                                  * this conversion may be used for file creation
 318                                  * purposes. Fix inspired by Thomas Neumann <t.neumann@iku-ag.de>.
 319                                  */
 320                                 if (!conn->case_preserve ||
 321                                                 (mangle_is_8_3(start, False, SNUM(conn)) &&
 322                                                  !conn->short_case_preserve)) {
 323                                         strnorm(start, lp_defaultcase(SNUM(conn)));
 324                                 }
 325
 326                                 /*
 327                                  * check on the mangled stack to see if we can recover the
 328                                  * base of the filename.
 329                                  */
 330
 331                                 if (mangle_is_mangled(start, SNUM(conn))) {
 332                                         mangle_check_cache( start, sizeof(pstring) - 1 - (start - name), SNUM(conn));
 333                                 }
 334
 335                                 DEBUG(5,("New file %s\n",start));
 336                                 return(True);
 337                         }
 338
 339                         /*
 340                          * Restore the rest of the string. If the string was mangled the size
 341                          * may have changed.
 342                          */
 343                         if (end) {
 344                                 end = start + strlen(start);
 345                                 if (!safe_strcat(start, "/", sizeof(pstring) - 1 - (start - name)) ||
 346                                     !safe_strcat(start, rest, sizeof(pstring) - 1 - (start - name))) {
 347                                         return False;
 348                                 }
 349                                 *end = '\0';
 350                         } else {
 351                                 /*
 352                                  * We just scanned for, and found the end of the path.
 353                                  * We must return a valid stat struct if it exists.
 354                                  * JRA.
 355                                  */
 356
 357                                 if (SMB_VFS_STAT(conn,name, &st) == 0) {
 358                                         *pst = st;
 359                                 } else {
 360                                         SET_STAT_INVALID(st);
 361                                 }
 362                         }
 363                 } /* end else */
 364
 365                 /*
 366                  * Add to the dirpath that we have resolved so far.
 367                  */
 368                 if (*dirpath)
 369                         pstrcat(dirpath,"/");
 370
 371                 pstrcat(dirpath,start);
 372
 373                 /*
 374                  * Don't cache a name with mangled or wildcard components
 375                  * as this can change the size.
 376                  */
 377
 378                 if(!component_was_mangled && !name_has_wildcard)
 379                         stat_cache_add(orig_path, dirpath, conn->case_sensitive);
 380
 381                 /*
 382                  * Restore the / that we wiped out earlier.
 383                  */
 384                 if (end)
 385                         *end = '/';
 386         }
 387
 388         /*
 389          * Don't cache a name with mangled or wildcard components
 390          * as this can change the size.
 391          */
 392
 393         if(!component_was_mangled && !name_has_wildcard)
 394                 stat_cache_add(orig_path, name, conn->case_sensitive);
 395
 396         /*
 397          * The name has been resolved.
 398          */
 399
 400         DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
 401         return(True);
 402 }
 403
 404 /****************************************************************************
 405  Check a filename - possibly caling reducename.
 406  This is called by every routine before it allows an operation on a filename.
 407  It does any final confirmation necessary to ensure that the filename is
 408  a valid one for the user to access.
 409 ****************************************************************************/
 410
 411 BOOL check_name(const pstring name,connection_struct *conn)
 412 {
 413         BOOL ret = True;
 414
 415         if (IS_VETO_PATH(conn, name))  {
 416                 /* Is it not dot or dot dot. */
 417                 if (!((name[0] == '.') && (!name[1] || (name[1] == '.' && !name[2])))) {
 418                         DEBUG(5,("file path name %s vetoed\n",name));
 419                         errno = ENOENT;
 420                         return False;
 421                 }
 422         }
 423
 424         if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
 425                 ret = reduce_name(conn,name);
 426         }
 427
 428         if (!ret) {
 429                 DEBUG(5,("check_name on %s failed\n",name));
 430         }
 431
 432         return(ret);
 433 }
 434
 435 /****************************************************************************
 436  Scan a directory to find a filename, matching without case sensitivity.
 437  If the name looks like a mangled name then try via the mangling functions
 438 ****************************************************************************/
 439
 440 static BOOL scan_directory(connection_struct *conn, const char *path, char *name, size_t maxlength)
 441 {
 442         struct smb_Dir *cur_dir;
 443         const char *dname;
 444         BOOL mangled;
 445         long curpos;
 446
 447         mangled = mangle_is_mangled(name, SNUM(conn));
 448
 449         /* handle null paths */
 450         if (*path == 0)
 451                 path = ".";
 452
 453         /*
 454          * The incoming name can be mangled, and if we de-mangle it
 455          * here it will not compare correctly against the filename (name2)
 456          * read from the directory and then mangled by the mangle_map()
 457          * call. We need to mangle both names or neither.
 458          * (JRA).
 459          *
 460          * Fix for bug found by Dina Fine. If in case sensitive mode then
 461          * the mangle cache is no good (3 letter extension could be wrong
 462          * case - so don't demangle in this case - leave as mangled and
 463          * allow the mangling of the directory entry read (which is done
 464          * case insensitively) to match instead. This will lead to more
 465          * false positive matches but we fail completely without it. JRA.
 466          */
 467
 468         if (mangled && !conn->case_sensitive) {
 469                 mangled = !mangle_check_cache( name, maxlength, SNUM(conn));
 470         }
 471
 472         /* open the directory */
 473         if (!(cur_dir = OpenDir(conn, path, NULL, 0))) {
 474                 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
 475                 return(False);
 476         }
 477
 478         /* now scan for matching names */
 479         curpos = 0;
 480         while ((dname = ReadDirName(cur_dir, &curpos))) {
 481
 482                 /* Is it dot or dot dot. */
 483                 if ((dname[0] == '.') && (!dname[1] || (dname[1] == '.' && !dname[2]))) {
 484                         continue;
 485                 }
 486
 487                 /*
 488                  * At this point dname is the unmangled name.
 489                  * name is either mangled or not, depending on the state of the "mangled"
 490                  * variable. JRA.
 491                  */
 492
 493                 /*
 494                  * Check mangled name against mangled name, or unmangled name
 495                  * against unmangled name.
 496                  */
 497
 498                 if ((mangled && mangled_equal(name,dname,SNUM(conn))) || fname_equal(name, dname, conn->case_sensitive)) {
 499                         /* we've found the file, change it's name and return */
 500                         safe_strcpy(name, dname, maxlength);
 501                         CloseDir(cur_dir);
 502                         return(True);
 503                 }
 504         }
 505
 506         CloseDir(cur_dir);
 507         errno = ENOENT;
 508         return(False);
 509 }