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VERSION: Bump version number up to 3.6.17.
[Samba.git] / source3 / smbd / filename.c
blob207b56ce7722ca186f6f4d3715e06dde15650923
1 /*
2 Unix SMB/CIFS implementation.
3 filename handling routines
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1999-2007
6 Copyright (C) Ying Chen 2000
7 Copyright (C) Volker Lendecke 2007
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 /*
24 * New hash table stat cache code added by Ying Chen.
25 */
26
27 #include "includes.h"
28 #include "system/filesys.h"
29 #include "fake_file.h"
30 #include "smbd/smbd.h"
31
32 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
33 connection_struct *conn,
34 const char *orig_path,
35 struct smb_filename *smb_fname);
36
37 /****************************************************************************
38 Mangle the 2nd name and check if it is then equal to the first name.
39 ****************************************************************************/
40
41 static bool mangled_equal(const char *name1,
42 const char *name2,
43 const struct share_params *p)
44 {
45 char mname[13];
46
47 if (!name_to_8_3(name2, mname, False, p)) {
48 return False;
49 }
50 return strequal(name1, mname);
51 }
52
53 /****************************************************************************
54 Cope with the differing wildcard and non-wildcard error cases.
55 ****************************************************************************/
56
57 static NTSTATUS determine_path_error(const char *name,
58 bool allow_wcard_last_component)
59 {
60 const char *p;
61
62 if (!allow_wcard_last_component) {
63 /* Error code within a pathname. */
64 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
65 }
66
67 /* We're terminating here so we
68 * can be a little slower and get
69 * the error code right. Windows
70 * treats the last part of the pathname
71 * separately I think, so if the last
72 * component is a wildcard then we treat
73 * this ./ as "end of component" */
74
75 p = strchr(name, '/');
76
77 if (!p && (ms_has_wild(name) || ISDOT(name))) {
78 /* Error code at the end of a pathname. */
79 return NT_STATUS_OBJECT_NAME_INVALID;
80 } else {
81 /* Error code within a pathname. */
82 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
83 }
84 }
85
86 static NTSTATUS check_for_dot_component(const struct smb_filename *smb_fname)
87 {
88 /* Ensure we catch all names with in "/."
89 this is disallowed under Windows and
90 in POSIX they've already been removed. */
91 const char *p = strstr(smb_fname->base_name, "/."); /*mb safe*/
92 if (p) {
93 if (p[2] == '/') {
94 /* Error code within a pathname. */
95 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
96 } else if (p[2] == '\0') {
97 /* Error code at the end of a pathname. */
98 return NT_STATUS_OBJECT_NAME_INVALID;
99 }
100 }
101 return NT_STATUS_OK;
102 }
103
104 /****************************************************************************
105 Optimization for common case where the missing part
106 is in the last component and the client already
107 sent the correct case.
108 Returns NT_STATUS_OK to mean continue the tree walk
109 (possibly with modified start pointer).
110 Any other NT_STATUS_XXX error means terminate the path
111 lookup here.
112 ****************************************************************************/
113
114 static NTSTATUS check_parent_exists(TALLOC_CTX *ctx,
115 connection_struct *conn,
116 bool posix_pathnames,
117 const struct smb_filename *smb_fname,
118 char **pp_dirpath,
119 char **pp_start)
120 {
121 struct smb_filename parent_fname;
122 const char *last_component = NULL;
123 NTSTATUS status;
124 int ret;
125
126 ZERO_STRUCT(parent_fname);
127 if (!parent_dirname(ctx, smb_fname->base_name,
128 &parent_fname.base_name,
129 &last_component)) {
130 return NT_STATUS_NO_MEMORY;
131 }
132
133 /*
134 * If there was no parent component in
135 * smb_fname->base_name of the parent name
136 * contained a wildcard then don't do this
137 * optimization.
138 */
139 if ((smb_fname->base_name == last_component) ||
140 ms_has_wild(parent_fname.base_name)) {
141 return NT_STATUS_OK;
142 }
143
144 if (posix_pathnames) {
145 ret = SMB_VFS_LSTAT(conn, &parent_fname);
146 } else {
147 ret = SMB_VFS_STAT(conn, &parent_fname);
148 }
149
150 /* If the parent stat failed, just continue
151 with the normal tree walk. */
152
153 if (ret == -1) {
154 return NT_STATUS_OK;
155 }
156
157 status = check_for_dot_component(&parent_fname);
158 if (!NT_STATUS_IS_OK(status)) {
159 return status;
160 }
161
162 /* Parent exists - set "start" to be the
163 * last compnent to shorten the tree walk. */
164
165 /*
166 * Safe to use CONST_DISCARD
167 * here as last_component points
168 * into our smb_fname->base_name.
169 */
170 *pp_start = CONST_DISCARD(char *,last_component);
171
172 /* Update dirpath. */
173 TALLOC_FREE(*pp_dirpath);
174 *pp_dirpath = talloc_strdup(ctx, parent_fname.base_name);
175 if (!*pp_dirpath) {
176 return NT_STATUS_NO_MEMORY;
177 }
178
179 DEBUG(5,("check_parent_exists: name "
180 "= %s, dirpath = %s, "
181 "start = %s\n",
182 smb_fname->base_name,
183 *pp_dirpath,
184 *pp_start));
185
186 return NT_STATUS_OK;
187 }
188
189 /****************************************************************************
190 This routine is called to convert names from the dos namespace to unix
191 namespace. It needs to handle any case conversions, mangling, format changes,
192 streams etc.
193
194 We assume that we have already done a chdir() to the right "root" directory
195 for this service.
196
197 The function will return an NTSTATUS error if some part of the name except for
198 the last part cannot be resolved, else NT_STATUS_OK.
199
200 Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we
201 didn't get any fatal errors that should immediately terminate the calling SMB
202 processing whilst resolving.
203
204 If the UCF_SAVE_LCOMP flag is passed in, then the unmodified last component
205 of the pathname is set in smb_filename->original_lcomp.
206
207 If UCF_ALWAYS_ALLOW_WCARD_LCOMP is passed in, then a MS wildcard was detected
208 and should be allowed in the last component of the path only.
209
210 If the orig_path was a stream, smb_filename->base_name will point to the base
211 filename, and smb_filename->stream_name will point to the stream name. If
212 orig_path was not a stream, then smb_filename->stream_name will be NULL.
213
214 On exit from unix_convert, the smb_filename->st stat struct will be populated
215 if the file exists and was found, if not this stat struct will be filled with
216 zeros (and this can be detected by checking for nlinks = 0, which can never be
217 true for any file).
218 ****************************************************************************/
219
220 NTSTATUS unix_convert(TALLOC_CTX *ctx,
221 connection_struct *conn,
222 const char *orig_path,
223 struct smb_filename **smb_fname_out,
224 uint32_t ucf_flags)
225 {
226 struct smb_filename *smb_fname = NULL;
227 char *start, *end;
228 char *dirpath = NULL;
229 char *stream = NULL;
230 bool component_was_mangled = False;
231 bool name_has_wildcard = False;
232 bool posix_pathnames = false;
233 bool allow_wcard_last_component =
234 (ucf_flags & UCF_ALWAYS_ALLOW_WCARD_LCOMP);
235 bool save_last_component = ucf_flags & UCF_SAVE_LCOMP;
236 NTSTATUS status;
237 int ret = -1;
238
239 *smb_fname_out = NULL;
240
241 smb_fname = talloc_zero(ctx, struct smb_filename);
242 if (smb_fname == NULL) {
243 return NT_STATUS_NO_MEMORY;
244 }
245
246 if (conn->printer) {
247 /* we don't ever use the filenames on a printer share as a
248 filename - so don't convert them */
249 if (!(smb_fname->base_name = talloc_strdup(smb_fname,
250 orig_path))) {
251 status = NT_STATUS_NO_MEMORY;
252 goto err;
253 }
254 goto done;
255 }
256
257 DEBUG(5, ("unix_convert called on file \"%s\"\n", orig_path));
258
259 /*
260 * Conversion to basic unix format is already done in
261 * check_path_syntax().
262 */
263
264 /*
265 * Names must be relative to the root of the service - any leading /.
266 * and trailing /'s should have been trimmed by check_path_syntax().
267 */
268
269 #ifdef DEVELOPER
270 SMB_ASSERT(*orig_path != '/');
271 #endif
272
273 /*
274 * If we trimmed down to a single '\0' character
275 * then we should use the "." directory to avoid
276 * searching the cache, but not if we are in a
277 * printing share.
278 * As we know this is valid we can return true here.
279 */
280
281 if (!*orig_path) {
282 if (!(smb_fname->base_name = talloc_strdup(smb_fname, "."))) {
283 status = NT_STATUS_NO_MEMORY;
284 goto err;
285 }
286 if (SMB_VFS_STAT(conn, smb_fname) != 0) {
287 status = map_nt_error_from_unix(errno);
288 goto err;
289 }
290 DEBUG(5, ("conversion finished \"\" -> %s\n",
291 smb_fname->base_name));
292 goto done;
293 }
294
295 if (orig_path[0] == '.' && (orig_path[1] == '/' ||
296 orig_path[1] == '\0')) {
297 /* Start of pathname can't be "." only. */
298 if (orig_path[1] == '\0' || orig_path[2] == '\0') {
299 status = NT_STATUS_OBJECT_NAME_INVALID;
300 } else {
301 status =determine_path_error(&orig_path[2],
302 allow_wcard_last_component);
303 }
304 goto err;
305 }
306
307 /* Start with the full orig_path as given by the caller. */
308 if (!(smb_fname->base_name = talloc_strdup(smb_fname, orig_path))) {
309 DEBUG(0, ("talloc_strdup failed\n"));
310 status = NT_STATUS_NO_MEMORY;
311 goto err;
312 }
313
314 /*
315 * Large directory fix normalization. If we're case sensitive, and
316 * the case preserving parameters are set to "no", normalize the case of
317 * the incoming filename from the client WHETHER IT EXISTS OR NOT !
318 * This is in conflict with the current (3.0.20) man page, but is
319 * what people expect from the "large directory howto". I'll update
320 * the man page. Thanks to jht@samba.org for finding this. JRA.
321 */
322
323 if (conn->case_sensitive && !conn->case_preserve &&
324 !conn->short_case_preserve) {
325 strnorm(smb_fname->base_name, lp_defaultcase(SNUM(conn)));
326 }
327
328 /*
329 * Ensure saved_last_component is valid even if file exists.
330 */
331
332 if(save_last_component) {
333 end = strrchr_m(smb_fname->base_name, '/');
334 if (end) {
335 smb_fname->original_lcomp = talloc_strdup(smb_fname,
336 end + 1);
337 } else {
338 smb_fname->original_lcomp =
339 talloc_strdup(smb_fname, smb_fname->base_name);
340 }
341 if (smb_fname->original_lcomp == NULL) {
342 status = NT_STATUS_NO_MEMORY;
343 goto err;
344 }
345 }
346
347 posix_pathnames = (lp_posix_pathnames() ||
348 (ucf_flags & UCF_POSIX_PATHNAMES));
349
350 /*
351 * Strip off the stream, and add it back when we're done with the
352 * base_name.
353 */
354 if (!posix_pathnames) {
355 stream = strchr_m(smb_fname->base_name, ':');
356
357 if (stream != NULL) {
358 char *tmp = talloc_strdup(smb_fname, stream);
359 if (tmp == NULL) {
360 status = NT_STATUS_NO_MEMORY;
361 goto err;
362 }
363 /*
364 * Since this is actually pointing into
365 * smb_fname->base_name this truncates base_name.
366 */
367 *stream = '\0';
368 stream = tmp;
369 }
370 }
371
372 start = smb_fname->base_name;
373
374 /*
375 * If we're providing case insensitive semantics or
376 * the underlying filesystem is case insensitive,
377 * then a case-normalized hit in the stat-cache is
378 * authoratitive. JRA.
379 *
380 * Note: We're only checking base_name. The stream_name will be
381 * added and verified in build_stream_path().
382 */
383
384 if((!conn->case_sensitive || !(conn->fs_capabilities &
385 FILE_CASE_SENSITIVE_SEARCH)) &&
386 stat_cache_lookup(conn, posix_pathnames, &smb_fname->base_name, &dirpath, &start,
387 &smb_fname->st)) {
388 goto done;
389 }
390
391 /*
392 * Make sure "dirpath" is an allocated string, we use this for
393 * building the directories with talloc_asprintf and free it.
394 */
395
396 if ((dirpath == NULL) && (!(dirpath = talloc_strdup(ctx,"")))) {
397 DEBUG(0, ("talloc_strdup failed\n"));
398 status = NT_STATUS_NO_MEMORY;
399 goto err;
400 }
401
402 /*
403 * If we have a wildcard we must walk the path to
404 * find where the error is, even if case sensitive
405 * is true.
406 */
407
408 name_has_wildcard = ms_has_wild(smb_fname->base_name);
409 if (name_has_wildcard && !allow_wcard_last_component) {
410 /* Wildcard not valid anywhere. */
411 status = NT_STATUS_OBJECT_NAME_INVALID;
412 goto fail;
413 }
414
415 DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n",
416 smb_fname->base_name, dirpath, start));
417
418 if (!name_has_wildcard) {
419 /*
420 * stat the name - if it exists then we can add the stream back (if
421 * there was one) and be done!
422 */
423
424 if (posix_pathnames) {
425 ret = SMB_VFS_LSTAT(conn, smb_fname);
426 } else {
427 ret = SMB_VFS_STAT(conn, smb_fname);
428 }
429
430 if (ret == 0) {
431 status = check_for_dot_component(smb_fname);
432 if (!NT_STATUS_IS_OK(status)) {
433 goto fail;
434 }
435 /* Add the path (not including the stream) to the cache. */
436 stat_cache_add(orig_path, smb_fname->base_name,
437 conn->case_sensitive);
438 DEBUG(5,("conversion of base_name finished %s -> %s\n",
439 orig_path, smb_fname->base_name));
440 goto done;
441 }
442
443 /* Stat failed - ensure we don't use it. */
444 SET_STAT_INVALID(smb_fname->st);
445
446 if (errno == ENOENT) {
447 /* Optimization when creating a new file - only
448 the last component doesn't exist.
449 NOTE : check_parent_exists() doesn't preserve errno.
450 */
451 int saved_errno = errno;
452 status = check_parent_exists(ctx,
453 conn,
454 posix_pathnames,
455 smb_fname,
456 &dirpath,
457 &start);
458 errno = saved_errno;
459 if (!NT_STATUS_IS_OK(status)) {
460 goto fail;
461 }
462 }
463
464 /*
465 * A special case - if we don't have any wildcards or mangling chars and are case
466 * sensitive or the underlying filesystem is case insensitive then searching
467 * won't help.
468 */
469
470 if ((conn->case_sensitive || !(conn->fs_capabilities &
471 FILE_CASE_SENSITIVE_SEARCH)) &&
472 !mangle_is_mangled(smb_fname->base_name, conn->params)) {
473
474 status = check_for_dot_component(smb_fname);
475 if (!NT_STATUS_IS_OK(status)) {
476 goto fail;
477 }
478
479 /*
480 * The stat failed. Could be ok as it could be
481 * a new file.
482 */
483
484 if (errno == ENOTDIR || errno == ELOOP) {
485 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
486 goto fail;
487 } else if (errno == ENOENT) {
488 /*
489 * Was it a missing last component ?
490 * or a missing intermediate component ?
491 */
492 struct smb_filename parent_fname;
493 const char *last_component = NULL;
494
495 ZERO_STRUCT(parent_fname);
496 if (!parent_dirname(ctx, smb_fname->base_name,
497 &parent_fname.base_name,
498 &last_component)) {
499 status = NT_STATUS_NO_MEMORY;
500 goto fail;
501 }
502 if (posix_pathnames) {
503 ret = SMB_VFS_LSTAT(conn, &parent_fname);
504 } else {
505 ret = SMB_VFS_STAT(conn, &parent_fname);
506 }
507 if (ret == -1) {
508 if (errno == ENOTDIR ||
509 errno == ENOENT ||
510 errno == ELOOP) {
511 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
512 goto fail;
513 }
514 }
515
516 /*
517 * Missing last component is ok - new file.
518 * Also deal with permission denied elsewhere.
519 * Just drop out to done.
520 */
521 goto done;
522 }
523 }
524 } else {
525 /*
526 * We have a wildcard in the pathname.
527 *
528 * Optimization for common case where the wildcard
529 * is in the last component and the client already
530 * sent the correct case.
531 * NOTE : check_parent_exists() doesn't preserve errno.
532 */
533 int saved_errno = errno;
534 status = check_parent_exists(ctx,
535 conn,
536 posix_pathnames,
537 smb_fname,
538 &dirpath,
539 &start);
540 errno = saved_errno;
541 if (!NT_STATUS_IS_OK(status)) {
542 goto fail;
543 }
544 }
545
546 /*
547 * is_mangled() was changed to look at an entire pathname, not
548 * just a component. JRA.
549 */
550
551 if (mangle_is_mangled(start, conn->params)) {
552 component_was_mangled = True;
553 }
554
555 /*
556 * Now we need to recursively match the name against the real
557 * directory structure.
558 */
559
560 /*
561 * Match each part of the path name separately, trying the names
562 * as is first, then trying to scan the directory for matching names.
563 */
564
565 for (; start ; start = (end?end+1:(char *)NULL)) {
566 /*
567 * Pinpoint the end of this section of the filename.
568 */
569 /* mb safe. '/' can't be in any encoded char. */
570 end = strchr(start, '/');
571
572 /*
573 * Chop the name at this point.
574 */
575 if (end) {
576 *end = 0;
577 }
578
579 if (save_last_component) {
580 TALLOC_FREE(smb_fname->original_lcomp);
581 smb_fname->original_lcomp = talloc_strdup(smb_fname,
582 end ? end + 1 : start);
583 if (!smb_fname->original_lcomp) {
584 DEBUG(0, ("talloc failed\n"));
585 status = NT_STATUS_NO_MEMORY;
586 goto err;
587 }
588 }
589
590 /* The name cannot have a component of "." */
591
592 if (ISDOT(start)) {
593 if (!end) {
594 /* Error code at the end of a pathname. */
595 status = NT_STATUS_OBJECT_NAME_INVALID;
596 } else {
597 status = determine_path_error(end+1,
598 allow_wcard_last_component);
599 }
600 goto fail;
601 }
602
603 /* The name cannot have a wildcard if it's not
604 the last component. */
605
606 name_has_wildcard = ms_has_wild(start);
607
608 /* Wildcards never valid within a pathname. */
609 if (name_has_wildcard && end) {
610 status = NT_STATUS_OBJECT_NAME_INVALID;
611 goto fail;
612 }
613
614 /* Skip the stat call if it's a wildcard end. */
615 if (name_has_wildcard) {
616 DEBUG(5,("Wildcard %s\n",start));
617 goto done;
618 }
619
620 /*
621 * Check if the name exists up to this point.
622 */
623
624 if (posix_pathnames) {
625 ret = SMB_VFS_LSTAT(conn, smb_fname);
626 } else {
627 ret = SMB_VFS_STAT(conn, smb_fname);
628 }
629
630 if (ret == 0) {
631 /*
632 * It exists. it must either be a directory or this must
633 * be the last part of the path for it to be OK.
634 */
635 if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
636 /*
637 * An intermediate part of the name isn't
638 * a directory.
639 */
640 DEBUG(5,("Not a dir %s\n",start));
641 *end = '/';
642 /*
643 * We need to return the fact that the
644 * intermediate name resolution failed. This
645 * is used to return an error of ERRbadpath
646 * rather than ERRbadfile. Some Windows
647 * applications depend on the difference between
648 * these two errors.
649 */
650 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
651 goto fail;
652 }
653
654 } else {
655 char *found_name = NULL;
656
657 /* Stat failed - ensure we don't use it. */
658 SET_STAT_INVALID(smb_fname->st);
659
660 /*
661 * Reset errno so we can detect
662 * directory open errors.
663 */
664 errno = 0;
665
666 /*
667 * Try to find this part of the path in the directory.
668 */
669
670 if (name_has_wildcard ||
671 (get_real_filename(conn, dirpath, start,
672 talloc_tos(),
673 &found_name) == -1)) {
674 char *unmangled;
675
676 if (end) {
677 /*
678 * An intermediate part of the name
679 * can't be found.
680 */
681 DEBUG(5,("Intermediate not found %s\n",
682 start));
683 *end = '/';
684
685 /*
686 * We need to return the fact that the
687 * intermediate name resolution failed.
688 * This is used to return an error of
689 * ERRbadpath rather than ERRbadfile.
690 * Some Windows applications depend on
691 * the difference between these two
692 * errors.
693 */
694
695 /*
696 * ENOENT, ENOTDIR and ELOOP all map
697 * to NT_STATUS_OBJECT_PATH_NOT_FOUND
698 * in the filename walk.
699 */
700
701 if (errno == ENOENT ||
702 errno == ENOTDIR ||
703 errno == ELOOP) {
704 status =
705 NT_STATUS_OBJECT_PATH_NOT_FOUND;
706 }
707 else {
708 status =
709 map_nt_error_from_unix(errno);
710 }
711 goto fail;
712 }
713
714 /*
715 * ENOENT/EACCESS are the only valid errors
716 * here. EACCESS needs handling here for
717 * "dropboxes", i.e. directories where users
718 * can only put stuff with permission -wx.
719 */
720 if ((errno != 0) && (errno != ENOENT)
721 && (errno != EACCES)) {
722 /*
723 * ENOTDIR and ELOOP both map to
724 * NT_STATUS_OBJECT_PATH_NOT_FOUND
725 * in the filename walk.
726 */
727 if (errno == ENOTDIR ||
728 errno == ELOOP) {
729 status =
730 NT_STATUS_OBJECT_PATH_NOT_FOUND;
731 } else {
732 status =
733 map_nt_error_from_unix(errno);
734 }
735 goto fail;
736 }
737
738 /*
739 * Just the last part of the name doesn't exist.
740 * We need to strupper() or strlower() it as
741 * this conversion may be used for file creation
742 * purposes. Fix inspired by
743 * Thomas Neumann <t.neumann@iku-ag.de>.
744 */
745 if (!conn->case_preserve ||
746 (mangle_is_8_3(start, False,
747 conn->params) &&
748 !conn->short_case_preserve)) {
749 strnorm(start,
750 lp_defaultcase(SNUM(conn)));
751 }
752
753 /*
754 * check on the mangled stack to see if we can
755 * recover the base of the filename.
756 */
757
758 if (mangle_is_mangled(start, conn->params)
759 && mangle_lookup_name_from_8_3(ctx,
760 start,
761 &unmangled,
762 conn->params)) {
763 char *tmp;
764 size_t start_ofs =
765 start - smb_fname->base_name;
766
767 if (*dirpath != '\0') {
768 tmp = talloc_asprintf(
769 smb_fname, "%s/%s",
770 dirpath, unmangled);
771 TALLOC_FREE(unmangled);
772 }
773 else {
774 tmp = unmangled;
775 }
776 if (tmp == NULL) {
777 DEBUG(0, ("talloc failed\n"));
778 status = NT_STATUS_NO_MEMORY;
779 goto err;
780 }
781 TALLOC_FREE(smb_fname->base_name);
782 smb_fname->base_name = tmp;
783 start =
784 smb_fname->base_name + start_ofs;
785 end = start + strlen(start);
786 }
787
788 DEBUG(5,("New file %s\n",start));
789 goto done;
790 }
791
792
793 /*
794 * Restore the rest of the string. If the string was
795 * mangled the size may have changed.
796 */
797 if (end) {
798 char *tmp;
799 size_t start_ofs =
800 start - smb_fname->base_name;
801
802 if (*dirpath != '\0') {
803 tmp = talloc_asprintf(smb_fname,
804 "%s/%s/%s", dirpath,
805 found_name, end+1);
806 }
807 else {
808 tmp = talloc_asprintf(smb_fname,
809 "%s/%s", found_name,
810 end+1);
811 }
812 if (tmp == NULL) {
813 DEBUG(0, ("talloc_asprintf failed\n"));
814 status = NT_STATUS_NO_MEMORY;
815 goto err;
816 }
817 TALLOC_FREE(smb_fname->base_name);
818 smb_fname->base_name = tmp;
819 start = smb_fname->base_name + start_ofs;
820 end = start + strlen(found_name);
821 *end = '\0';
822 } else {
823 char *tmp;
824 size_t start_ofs =
825 start - smb_fname->base_name;
826
827 if (*dirpath != '\0') {
828 tmp = talloc_asprintf(smb_fname,
829 "%s/%s", dirpath,
830 found_name);
831 } else {
832 tmp = talloc_strdup(smb_fname,
833 found_name);
834 }
835 if (tmp == NULL) {
836 DEBUG(0, ("talloc failed\n"));
837 status = NT_STATUS_NO_MEMORY;
838 goto err;
839 }
840 TALLOC_FREE(smb_fname->base_name);
841 smb_fname->base_name = tmp;
842 start = smb_fname->base_name + start_ofs;
843
844 /*
845 * We just scanned for, and found the end of
846 * the path. We must return a valid stat struct
847 * if it exists. JRA.
848 */
849
850 if (posix_pathnames) {
851 ret = SMB_VFS_LSTAT(conn, smb_fname);
852 } else {
853 ret = SMB_VFS_STAT(conn, smb_fname);
854 }
855
856 if (ret != 0) {
857 SET_STAT_INVALID(smb_fname->st);
858 }
859 }
860
861 TALLOC_FREE(found_name);
862 } /* end else */
863
864 #ifdef DEVELOPER
865 /*
866 * This sucks!
867 * We should never provide different behaviors
868 * depending on DEVELOPER!!!
869 */
870 if (VALID_STAT(smb_fname->st)) {
871 bool delete_pending;
872 uint32_t name_hash;
873
874 status = file_name_hash(conn,
875 smb_fname_str_dbg(smb_fname),
876 &name_hash);
877 if (!NT_STATUS_IS_OK(status)) {
878 goto fail;
879 }
880
881 get_file_infos(vfs_file_id_from_sbuf(conn,
882 &smb_fname->st),
883 name_hash,
884 &delete_pending, NULL);
885 if (delete_pending) {
886 status = NT_STATUS_DELETE_PENDING;
887 goto fail;
888 }
889 }
890 #endif
891
892 /*
893 * Add to the dirpath that we have resolved so far.
894 */
895
896 if (*dirpath != '\0') {
897 char *tmp = talloc_asprintf(ctx,
898 "%s/%s", dirpath, start);
899 if (!tmp) {
900 DEBUG(0, ("talloc_asprintf failed\n"));
901 status = NT_STATUS_NO_MEMORY;
902 goto err;
903 }
904 TALLOC_FREE(dirpath);
905 dirpath = tmp;
906 }
907 else {
908 TALLOC_FREE(dirpath);
909 if (!(dirpath = talloc_strdup(ctx,start))) {
910 DEBUG(0, ("talloc_strdup failed\n"));
911 status = NT_STATUS_NO_MEMORY;
912 goto err;
913 }
914 }
915
916 /*
917 * Cache the dirpath thus far. Don't cache a name with mangled
918 * or wildcard components as this can change the size.
919 */
920 if(!component_was_mangled && !name_has_wildcard) {
921 stat_cache_add(orig_path, dirpath,
922 conn->case_sensitive);
923 }
924
925 /*
926 * Restore the / that we wiped out earlier.
927 */
928 if (end) {
929 *end = '/';
930 }
931 }
932
933 /*
934 * Cache the full path. Don't cache a name with mangled or wildcard
935 * components as this can change the size.
936 */
937
938 if(!component_was_mangled && !name_has_wildcard) {
939 stat_cache_add(orig_path, smb_fname->base_name,
940 conn->case_sensitive);
941 }
942
943 /*
944 * The name has been resolved.
945 */
946
947 DEBUG(5,("conversion finished %s -> %s\n", orig_path,
948 smb_fname->base_name));
949
950 done:
951 /* Add back the stream if one was stripped off originally. */
952 if (stream != NULL) {
953 smb_fname->stream_name = stream;
954
955 /* Check path now that the base_name has been converted. */
956 status = build_stream_path(ctx, conn, orig_path, smb_fname);
957 if (!NT_STATUS_IS_OK(status)) {
958 goto fail;
959 }
960 }
961 TALLOC_FREE(dirpath);
962 *smb_fname_out = smb_fname;
963 return NT_STATUS_OK;
964 fail:
965 DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
966 if (*dirpath != '\0') {
967 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
968 dirpath, start);
969 } else {
970 smb_fname->base_name = talloc_strdup(smb_fname, start);
971 }
972 if (!smb_fname->base_name) {
973 DEBUG(0, ("talloc_asprintf failed\n"));
974 status = NT_STATUS_NO_MEMORY;
975 goto err;
976 }
977
978 *smb_fname_out = smb_fname;
979 TALLOC_FREE(dirpath);
980 return status;
981 err:
982 TALLOC_FREE(smb_fname);
983 return status;
984 }
985
986 /****************************************************************************
987 Ensure a path is not vetod.
988 ****************************************************************************/
989
990 NTSTATUS check_veto_path(connection_struct *conn, const char *name)
991 {
992 if (IS_VETO_PATH(conn, name)) {
993 /* Is it not dot or dot dot. */
994 if (!(ISDOT(name) || ISDOTDOT(name))) {
995 DEBUG(5,("check_veto_path: file path name %s vetoed\n",
996 name));
997 return map_nt_error_from_unix(ENOENT);
998 }
999 }
1000 return NT_STATUS_OK;
1001 }
1002
1003 /****************************************************************************
1004 Check a filename - possibly calling check_reduced_name.
1005 This is called by every routine before it allows an operation on a filename.
1006 It does any final confirmation necessary to ensure that the filename is
1007 a valid one for the user to access.
1008 ****************************************************************************/
1009
1010 NTSTATUS check_name(connection_struct *conn, const char *name)
1011 {
1012 NTSTATUS status = check_veto_path(conn, name);
1013
1014 if (!NT_STATUS_IS_OK(status)) {
1015 return status;
1016 }
1017
1018 if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
1019 status = check_reduced_name(conn,name);
1020 if (!NT_STATUS_IS_OK(status)) {
1021 DEBUG(5,("check_name: name %s failed with %s\n",name,
1022 nt_errstr(status)));
1023 return status;
1024 }
1025 }
1026
1027 return NT_STATUS_OK;
1028 }
1029
1030 /****************************************************************************
1031 Check if two filenames are equal.
1032 This needs to be careful about whether we are case sensitive.
1033 ****************************************************************************/
1034
1035 static bool fname_equal(const char *name1, const char *name2,
1036 bool case_sensitive)
1037 {
1038 /* Normal filename handling */
1039 if (case_sensitive) {
1040 return(strcmp(name1,name2) == 0);
1041 }
1042
1043 return(strequal(name1,name2));
1044 }
1045
1046 /****************************************************************************
1047 Scan a directory to find a filename, matching without case sensitivity.
1048 If the name looks like a mangled name then try via the mangling functions
1049 ****************************************************************************/
1050
1051 static int get_real_filename_full_scan(connection_struct *conn,
1052 const char *path, const char *name,
1053 bool mangled,
1054 TALLOC_CTX *mem_ctx, char **found_name)
1055 {
1056 struct smb_Dir *cur_dir;
1057 const char *dname = NULL;
1058 char *talloced = NULL;
1059 char *unmangled_name = NULL;
1060 long curpos;
1061
1062 /* handle null paths */
1063 if ((path == NULL) || (*path == 0)) {
1064 path = ".";
1065 }
1066
1067 /* If we have a case-sensitive filesystem, it doesn't do us any
1068 * good to search for a name. If a case variation of the name was
1069 * there, then the original stat(2) would have found it.
1070 */
1071 if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1072 errno = ENOENT;
1073 return -1;
1074 }
1075
1076 /*
1077 * The incoming name can be mangled, and if we de-mangle it
1078 * here it will not compare correctly against the filename (name2)
1079 * read from the directory and then mangled by the name_to_8_3()
1080 * call. We need to mangle both names or neither.
1081 * (JRA).
1082 *
1083 * Fix for bug found by Dina Fine. If in case sensitive mode then
1084 * the mangle cache is no good (3 letter extension could be wrong
1085 * case - so don't demangle in this case - leave as mangled and
1086 * allow the mangling of the directory entry read (which is done
1087 * case insensitively) to match instead. This will lead to more
1088 * false positive matches but we fail completely without it. JRA.
1089 */
1090
1091 if (mangled && !conn->case_sensitive) {
1092 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1093 &unmangled_name,
1094 conn->params);
1095 if (!mangled) {
1096 /* Name is now unmangled. */
1097 name = unmangled_name;
1098 }
1099 }
1100
1101 /* open the directory */
1102 if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1103 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1104 TALLOC_FREE(unmangled_name);
1105 return -1;
1106 }
1107
1108 /* now scan for matching names */
1109 curpos = 0;
1110 while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1111
1112 /* Is it dot or dot dot. */
1113 if (ISDOT(dname) || ISDOTDOT(dname)) {
1114 TALLOC_FREE(talloced);
1115 continue;
1116 }
1117
1118 /*
1119 * At this point dname is the unmangled name.
1120 * name is either mangled or not, depending on the state
1121 * of the "mangled" variable. JRA.
1122 */
1123
1124 /*
1125 * Check mangled name against mangled name, or unmangled name
1126 * against unmangled name.
1127 */
1128
1129 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1130 fname_equal(name, dname, conn->case_sensitive)) {
1131 /* we've found the file, change it's name and return */
1132 *found_name = talloc_strdup(mem_ctx, dname);
1133 TALLOC_FREE(unmangled_name);
1134 TALLOC_FREE(cur_dir);
1135 if (!*found_name) {
1136 errno = ENOMEM;
1137 TALLOC_FREE(talloced);
1138 return -1;
1139 }
1140 TALLOC_FREE(talloced);
1141 return 0;
1142 }
1143 TALLOC_FREE(talloced);
1144 }
1145
1146 TALLOC_FREE(unmangled_name);
1147 TALLOC_FREE(cur_dir);
1148 errno = ENOENT;
1149 return -1;
1150 }
1151
1152 /****************************************************************************
1153 Wrapper around the vfs get_real_filename and the full directory scan
1154 fallback.
1155 ****************************************************************************/
1156
1157 int get_real_filename(connection_struct *conn, const char *path,
1158 const char *name, TALLOC_CTX *mem_ctx,
1159 char **found_name)
1160 {
1161 int ret;
1162 bool mangled;
1163
1164 mangled = mangle_is_mangled(name, conn->params);
1165
1166 if (mangled) {
1167 return get_real_filename_full_scan(conn, path, name, mangled,
1168 mem_ctx, found_name);
1169 }
1170
1171 /* Try the vfs first to take advantage of case-insensitive stat. */
1172 ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1173
1174 /*
1175 * If the case-insensitive stat was successful, or returned an error
1176 * other than EOPNOTSUPP then there is no need to fall back on the
1177 * full directory scan.
1178 */
1179 if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1180 return ret;
1181 }
1182
1183 return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1184 found_name);
1185 }
1186
1187 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1188 connection_struct *conn,
1189 const char *orig_path,
1190 struct smb_filename *smb_fname)
1191 {
1192 NTSTATUS status;
1193 unsigned int i, num_streams = 0;
1194 struct stream_struct *streams = NULL;
1195
1196 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1197 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1198 return NT_STATUS_OK;
1199 }
1200
1201 if (errno != ENOENT) {
1202 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1203 status = map_nt_error_from_unix(errno);
1204 goto fail;
1205 }
1206
1207 /* Fall back to a case-insensitive scan of all streams on the file. */
1208 status = vfs_streaminfo(conn, NULL, smb_fname->base_name, mem_ctx,
1209 &num_streams, &streams);
1210
1211 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1212 SET_STAT_INVALID(smb_fname->st);
1213 return NT_STATUS_OK;
1214 }
1215
1216 if (!NT_STATUS_IS_OK(status)) {
1217 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1218 goto fail;
1219 }
1220
1221 for (i=0; i<num_streams; i++) {
1222 DEBUG(10, ("comparing [%s] and [%s]: ",
1223 smb_fname->stream_name, streams[i].name));
1224 if (fname_equal(smb_fname->stream_name, streams[i].name,
1225 conn->case_sensitive)) {
1226 DEBUGADD(10, ("equal\n"));
1227 break;
1228 }
1229 DEBUGADD(10, ("not equal\n"));
1230 }
1231
1232 /* Couldn't find the stream. */
1233 if (i == num_streams) {
1234 SET_STAT_INVALID(smb_fname->st);
1235 TALLOC_FREE(streams);
1236 return NT_STATUS_OK;
1237 }
1238
1239 DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1240 smb_fname->stream_name, streams[i].name));
1241
1242
1243 TALLOC_FREE(smb_fname->stream_name);
1244 smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1245 if (smb_fname->stream_name == NULL) {
1246 status = NT_STATUS_NO_MEMORY;
1247 goto fail;
1248 }
1249
1250 SET_STAT_INVALID(smb_fname->st);
1251
1252 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1253 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1254 }
1255 status = NT_STATUS_OK;
1256 fail:
1257 TALLOC_FREE(streams);
1258 return status;
1259 }
1260
1261 /**
1262 * Go through all the steps to validate a filename.
1263 *
1264 * @param ctx talloc_ctx to allocate memory with.
1265 * @param conn connection struct for vfs calls.
1266 * @param dfs_path Whether this path requires dfs resolution.
1267 * @param name_in The unconverted name.
1268 * @param ucf_flags flags to pass through to unix_convert().
1269 * UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1270 * p_cont_wcard != NULL and is true and
1271 * UCF_COND_ALLOW_WCARD_LCOMP.
1272 * @param p_cont_wcard If not NULL, will be set to true if the dfs path
1273 * resolution detects a wildcard.
1274 * @param pp_smb_fname The final converted name will be allocated if the
1275 * return is NT_STATUS_OK.
1276 *
1277 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1278 * error otherwise.
1279 */
1280 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1281 connection_struct *conn,
1282 bool dfs_path,
1283 const char *name_in,
1284 uint32_t ucf_flags,
1285 bool *ppath_contains_wcard,
1286 struct smb_filename **pp_smb_fname)
1287 {
1288 NTSTATUS status;
1289 bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1290 char *fname = NULL;
1291
1292 *pp_smb_fname = NULL;
1293
1294 status = resolve_dfspath_wcard(ctx, conn,
1295 dfs_path,
1296 name_in,
1297 allow_wcards,
1298 &fname,
1299 ppath_contains_wcard);
1300 if (!NT_STATUS_IS_OK(status)) {
1301 DEBUG(10,("filename_convert: resolve_dfspath failed "
1302 "for name %s with %s\n",
1303 name_in,
1304 nt_errstr(status) ));
1305 return status;
1306 }
1307
1308 if (is_fake_file_path(name_in)) {
1309 SMB_STRUCT_STAT st;
1310 ZERO_STRUCT(st);
1311 st.st_ex_nlink = 1;
1312 status = create_synthetic_smb_fname_split(ctx,
1313 name_in,
1314 &st,
1315 pp_smb_fname);
1316 return status;
1317 }
1318
1319 /*
1320 * If the caller conditionally allows wildcard lookups, only add the
1321 * always allow if the path actually does contain a wildcard.
1322 */
1323 if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1324 ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1325 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1326 }
1327
1328 status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1329 if (!NT_STATUS_IS_OK(status)) {
1330 DEBUG(10,("filename_convert: unix_convert failed "
1331 "for name %s with %s\n",
1332 fname,
1333 nt_errstr(status) ));
1334 return status;
1335 }
1336
1337 if ((ucf_flags & UCF_UNIX_NAME_LOOKUP) &&
1338 VALID_STAT((*pp_smb_fname)->st) &&
1339 S_ISLNK((*pp_smb_fname)->st.st_ex_mode)) {
1340 return check_veto_path(conn, (*pp_smb_fname)->base_name);
1341 }
1342
1343 status = check_name(conn, (*pp_smb_fname)->base_name);
1344 if (!NT_STATUS_IS_OK(status)) {
1345 DEBUG(3,("filename_convert: check_name failed "
1346 "for name %s with %s\n",
1347 smb_fname_str_dbg(*pp_smb_fname),
1348 nt_errstr(status) ));
1349 TALLOC_FREE(*pp_smb_fname);
1350 return status;
1351 }
1352
1353 return status;
1354 }
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