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smbd: Fix a profile problem
[Samba.git] / source3 / smbd / filename.c
blob934634a5b6c6420d31b2da869c85cd2a1c1ffdeb
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 && ((ucf_flags & UCF_CREATING_FILE) &&
722 (errno != EACCES))) {
723 /*
724 * ENOTDIR and ELOOP both map to
725 * NT_STATUS_OBJECT_PATH_NOT_FOUND
726 * in the filename walk.
727 */
728 if (errno == ENOTDIR ||
729 errno == ELOOP) {
730 status =
731 NT_STATUS_OBJECT_PATH_NOT_FOUND;
732 } else {
733 status =
734 map_nt_error_from_unix(errno);
735 }
736 goto fail;
737 }
738
739 /*
740 * Just the last part of the name doesn't exist.
741 * We need to strupper() or strlower() it as
742 * this conversion may be used for file creation
743 * purposes. Fix inspired by
744 * Thomas Neumann <t.neumann@iku-ag.de>.
745 */
746 if (!conn->case_preserve ||
747 (mangle_is_8_3(start, False,
748 conn->params) &&
749 !conn->short_case_preserve)) {
750 strnorm(start,
751 lp_defaultcase(SNUM(conn)));
752 }
753
754 /*
755 * check on the mangled stack to see if we can
756 * recover the base of the filename.
757 */
758
759 if (mangle_is_mangled(start, conn->params)
760 && mangle_lookup_name_from_8_3(ctx,
761 start,
762 &unmangled,
763 conn->params)) {
764 char *tmp;
765 size_t start_ofs =
766 start - smb_fname->base_name;
767
768 if (*dirpath != '\0') {
769 tmp = talloc_asprintf(
770 smb_fname, "%s/%s",
771 dirpath, unmangled);
772 TALLOC_FREE(unmangled);
773 }
774 else {
775 tmp = unmangled;
776 }
777 if (tmp == NULL) {
778 DEBUG(0, ("talloc failed\n"));
779 status = NT_STATUS_NO_MEMORY;
780 goto err;
781 }
782 TALLOC_FREE(smb_fname->base_name);
783 smb_fname->base_name = tmp;
784 start =
785 smb_fname->base_name + start_ofs;
786 end = start + strlen(start);
787 }
788
789 DEBUG(5,("New file %s\n",start));
790 goto done;
791 }
792
793
794 /*
795 * Restore the rest of the string. If the string was
796 * mangled the size may have changed.
797 */
798 if (end) {
799 char *tmp;
800 size_t start_ofs =
801 start - smb_fname->base_name;
802
803 if (*dirpath != '\0') {
804 tmp = talloc_asprintf(smb_fname,
805 "%s/%s/%s", dirpath,
806 found_name, end+1);
807 }
808 else {
809 tmp = talloc_asprintf(smb_fname,
810 "%s/%s", found_name,
811 end+1);
812 }
813 if (tmp == NULL) {
814 DEBUG(0, ("talloc_asprintf failed\n"));
815 status = NT_STATUS_NO_MEMORY;
816 goto err;
817 }
818 TALLOC_FREE(smb_fname->base_name);
819 smb_fname->base_name = tmp;
820 start = smb_fname->base_name + start_ofs;
821 end = start + strlen(found_name);
822 *end = '\0';
823 } else {
824 char *tmp;
825 size_t start_ofs =
826 start - smb_fname->base_name;
827
828 if (*dirpath != '\0') {
829 tmp = talloc_asprintf(smb_fname,
830 "%s/%s", dirpath,
831 found_name);
832 } else {
833 tmp = talloc_strdup(smb_fname,
834 found_name);
835 }
836 if (tmp == NULL) {
837 DEBUG(0, ("talloc failed\n"));
838 status = NT_STATUS_NO_MEMORY;
839 goto err;
840 }
841 TALLOC_FREE(smb_fname->base_name);
842 smb_fname->base_name = tmp;
843 start = smb_fname->base_name + start_ofs;
844
845 /*
846 * We just scanned for, and found the end of
847 * the path. We must return a valid stat struct
848 * if it exists. JRA.
849 */
850
851 if (posix_pathnames) {
852 ret = SMB_VFS_LSTAT(conn, smb_fname);
853 } else {
854 ret = SMB_VFS_STAT(conn, smb_fname);
855 }
856
857 if (ret != 0) {
858 SET_STAT_INVALID(smb_fname->st);
859 }
860 }
861
862 TALLOC_FREE(found_name);
863 } /* end else */
864
865 #ifdef DEVELOPER
866 /*
867 * This sucks!
868 * We should never provide different behaviors
869 * depending on DEVELOPER!!!
870 */
871 if (VALID_STAT(smb_fname->st)) {
872 bool delete_pending;
873 uint32_t name_hash;
874
875 status = file_name_hash(conn,
876 smb_fname_str_dbg(smb_fname),
877 &name_hash);
878 if (!NT_STATUS_IS_OK(status)) {
879 goto fail;
880 }
881
882 get_file_infos(vfs_file_id_from_sbuf(conn,
883 &smb_fname->st),
884 name_hash,
885 &delete_pending, NULL);
886 if (delete_pending) {
887 status = NT_STATUS_DELETE_PENDING;
888 goto fail;
889 }
890 }
891 #endif
892
893 /*
894 * Add to the dirpath that we have resolved so far.
895 */
896
897 if (*dirpath != '\0') {
898 char *tmp = talloc_asprintf(ctx,
899 "%s/%s", dirpath, start);
900 if (!tmp) {
901 DEBUG(0, ("talloc_asprintf failed\n"));
902 status = NT_STATUS_NO_MEMORY;
903 goto err;
904 }
905 TALLOC_FREE(dirpath);
906 dirpath = tmp;
907 }
908 else {
909 TALLOC_FREE(dirpath);
910 if (!(dirpath = talloc_strdup(ctx,start))) {
911 DEBUG(0, ("talloc_strdup failed\n"));
912 status = NT_STATUS_NO_MEMORY;
913 goto err;
914 }
915 }
916
917 /*
918 * Cache the dirpath thus far. Don't cache a name with mangled
919 * or wildcard components as this can change the size.
920 */
921 if(!component_was_mangled && !name_has_wildcard) {
922 stat_cache_add(orig_path, dirpath,
923 conn->case_sensitive);
924 }
925
926 /*
927 * Restore the / that we wiped out earlier.
928 */
929 if (end) {
930 *end = '/';
931 }
932 }
933
934 /*
935 * Cache the full path. Don't cache a name with mangled or wildcard
936 * components as this can change the size.
937 */
938
939 if(!component_was_mangled && !name_has_wildcard) {
940 stat_cache_add(orig_path, smb_fname->base_name,
941 conn->case_sensitive);
942 }
943
944 /*
945 * The name has been resolved.
946 */
947
948 DEBUG(5,("conversion finished %s -> %s\n", orig_path,
949 smb_fname->base_name));
950
951 done:
952 /* Add back the stream if one was stripped off originally. */
953 if (stream != NULL) {
954 smb_fname->stream_name = stream;
955
956 /* Check path now that the base_name has been converted. */
957 status = build_stream_path(ctx, conn, orig_path, smb_fname);
958 if (!NT_STATUS_IS_OK(status)) {
959 goto fail;
960 }
961 }
962 TALLOC_FREE(dirpath);
963 *smb_fname_out = smb_fname;
964 return NT_STATUS_OK;
965 fail:
966 DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
967 if (*dirpath != '\0') {
968 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
969 dirpath, start);
970 } else {
971 smb_fname->base_name = talloc_strdup(smb_fname, start);
972 }
973 if (!smb_fname->base_name) {
974 DEBUG(0, ("talloc_asprintf failed\n"));
975 status = NT_STATUS_NO_MEMORY;
976 goto err;
977 }
978
979 *smb_fname_out = smb_fname;
980 TALLOC_FREE(dirpath);
981 return status;
982 err:
983 TALLOC_FREE(smb_fname);
984 return status;
985 }
986
987 /****************************************************************************
988 Ensure a path is not vetod.
989 ****************************************************************************/
990
991 NTSTATUS check_veto_path(connection_struct *conn, const char *name)
992 {
993 if (IS_VETO_PATH(conn, name)) {
994 /* Is it not dot or dot dot. */
995 if (!(ISDOT(name) || ISDOTDOT(name))) {
996 DEBUG(5,("check_veto_path: file path name %s vetoed\n",
997 name));
998 return map_nt_error_from_unix(ENOENT);
999 }
1000 }
1001 return NT_STATUS_OK;
1002 }
1003
1004 /****************************************************************************
1005 Check a filename - possibly calling check_reduced_name.
1006 This is called by every routine before it allows an operation on a filename.
1007 It does any final confirmation necessary to ensure that the filename is
1008 a valid one for the user to access.
1009 ****************************************************************************/
1010
1011 NTSTATUS check_name(connection_struct *conn, const char *name)
1012 {
1013 NTSTATUS status = check_veto_path(conn, name);
1014
1015 if (!NT_STATUS_IS_OK(status)) {
1016 return status;
1017 }
1018
1019 if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
1020 status = check_reduced_name(conn,name);
1021 if (!NT_STATUS_IS_OK(status)) {
1022 DEBUG(5,("check_name: name %s failed with %s\n",name,
1023 nt_errstr(status)));
1024 return status;
1025 }
1026 }
1027
1028 return NT_STATUS_OK;
1029 }
1030
1031 /****************************************************************************
1032 Check if two filenames are equal.
1033 This needs to be careful about whether we are case sensitive.
1034 ****************************************************************************/
1035
1036 static bool fname_equal(const char *name1, const char *name2,
1037 bool case_sensitive)
1038 {
1039 /* Normal filename handling */
1040 if (case_sensitive) {
1041 return(strcmp(name1,name2) == 0);
1042 }
1043
1044 return(strequal(name1,name2));
1045 }
1046
1047 /****************************************************************************
1048 Scan a directory to find a filename, matching without case sensitivity.
1049 If the name looks like a mangled name then try via the mangling functions
1050 ****************************************************************************/
1051
1052 static int get_real_filename_full_scan(connection_struct *conn,
1053 const char *path, const char *name,
1054 bool mangled,
1055 TALLOC_CTX *mem_ctx, char **found_name)
1056 {
1057 struct smb_Dir *cur_dir;
1058 const char *dname = NULL;
1059 char *talloced = NULL;
1060 char *unmangled_name = NULL;
1061 long curpos;
1062
1063 /* handle null paths */
1064 if ((path == NULL) || (*path == 0)) {
1065 path = ".";
1066 }
1067
1068 /* If we have a case-sensitive filesystem, it doesn't do us any
1069 * good to search for a name. If a case variation of the name was
1070 * there, then the original stat(2) would have found it.
1071 */
1072 if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1073 errno = ENOENT;
1074 return -1;
1075 }
1076
1077 /*
1078 * The incoming name can be mangled, and if we de-mangle it
1079 * here it will not compare correctly against the filename (name2)
1080 * read from the directory and then mangled by the name_to_8_3()
1081 * call. We need to mangle both names or neither.
1082 * (JRA).
1083 *
1084 * Fix for bug found by Dina Fine. If in case sensitive mode then
1085 * the mangle cache is no good (3 letter extension could be wrong
1086 * case - so don't demangle in this case - leave as mangled and
1087 * allow the mangling of the directory entry read (which is done
1088 * case insensitively) to match instead. This will lead to more
1089 * false positive matches but we fail completely without it. JRA.
1090 */
1091
1092 if (mangled && !conn->case_sensitive) {
1093 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1094 &unmangled_name,
1095 conn->params);
1096 if (!mangled) {
1097 /* Name is now unmangled. */
1098 name = unmangled_name;
1099 }
1100 }
1101
1102 /* open the directory */
1103 if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1104 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1105 TALLOC_FREE(unmangled_name);
1106 return -1;
1107 }
1108
1109 /* now scan for matching names */
1110 curpos = 0;
1111 while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1112
1113 /* Is it dot or dot dot. */
1114 if (ISDOT(dname) || ISDOTDOT(dname)) {
1115 TALLOC_FREE(talloced);
1116 continue;
1117 }
1118
1119 /*
1120 * At this point dname is the unmangled name.
1121 * name is either mangled or not, depending on the state
1122 * of the "mangled" variable. JRA.
1123 */
1124
1125 /*
1126 * Check mangled name against mangled name, or unmangled name
1127 * against unmangled name.
1128 */
1129
1130 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1131 fname_equal(name, dname, conn->case_sensitive)) {
1132 /* we've found the file, change it's name and return */
1133 *found_name = talloc_strdup(mem_ctx, dname);
1134 TALLOC_FREE(unmangled_name);
1135 TALLOC_FREE(cur_dir);
1136 if (!*found_name) {
1137 errno = ENOMEM;
1138 TALLOC_FREE(talloced);
1139 return -1;
1140 }
1141 TALLOC_FREE(talloced);
1142 return 0;
1143 }
1144 TALLOC_FREE(talloced);
1145 }
1146
1147 TALLOC_FREE(unmangled_name);
1148 TALLOC_FREE(cur_dir);
1149 errno = ENOENT;
1150 return -1;
1151 }
1152
1153 /****************************************************************************
1154 Wrapper around the vfs get_real_filename and the full directory scan
1155 fallback.
1156 ****************************************************************************/
1157
1158 int get_real_filename(connection_struct *conn, const char *path,
1159 const char *name, TALLOC_CTX *mem_ctx,
1160 char **found_name)
1161 {
1162 int ret;
1163 bool mangled;
1164
1165 mangled = mangle_is_mangled(name, conn->params);
1166
1167 if (mangled) {
1168 return get_real_filename_full_scan(conn, path, name, mangled,
1169 mem_ctx, found_name);
1170 }
1171
1172 /* Try the vfs first to take advantage of case-insensitive stat. */
1173 ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1174
1175 /*
1176 * If the case-insensitive stat was successful, or returned an error
1177 * other than EOPNOTSUPP then there is no need to fall back on the
1178 * full directory scan.
1179 */
1180 if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1181 return ret;
1182 }
1183
1184 return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1185 found_name);
1186 }
1187
1188 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1189 connection_struct *conn,
1190 const char *orig_path,
1191 struct smb_filename *smb_fname)
1192 {
1193 NTSTATUS status;
1194 unsigned int i, num_streams = 0;
1195 struct stream_struct *streams = NULL;
1196
1197 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1198 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1199 return NT_STATUS_OK;
1200 }
1201
1202 if (errno != ENOENT) {
1203 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1204 status = map_nt_error_from_unix(errno);
1205 goto fail;
1206 }
1207
1208 /* Fall back to a case-insensitive scan of all streams on the file. */
1209 status = vfs_streaminfo(conn, NULL, smb_fname->base_name, mem_ctx,
1210 &num_streams, &streams);
1211
1212 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1213 SET_STAT_INVALID(smb_fname->st);
1214 return NT_STATUS_OK;
1215 }
1216
1217 if (!NT_STATUS_IS_OK(status)) {
1218 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1219 goto fail;
1220 }
1221
1222 for (i=0; i<num_streams; i++) {
1223 DEBUG(10, ("comparing [%s] and [%s]: ",
1224 smb_fname->stream_name, streams[i].name));
1225 if (fname_equal(smb_fname->stream_name, streams[i].name,
1226 conn->case_sensitive)) {
1227 DEBUGADD(10, ("equal\n"));
1228 break;
1229 }
1230 DEBUGADD(10, ("not equal\n"));
1231 }
1232
1233 /* Couldn't find the stream. */
1234 if (i == num_streams) {
1235 SET_STAT_INVALID(smb_fname->st);
1236 TALLOC_FREE(streams);
1237 return NT_STATUS_OK;
1238 }
1239
1240 DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1241 smb_fname->stream_name, streams[i].name));
1242
1243
1244 TALLOC_FREE(smb_fname->stream_name);
1245 smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1246 if (smb_fname->stream_name == NULL) {
1247 status = NT_STATUS_NO_MEMORY;
1248 goto fail;
1249 }
1250
1251 SET_STAT_INVALID(smb_fname->st);
1252
1253 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1254 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1255 }
1256 status = NT_STATUS_OK;
1257 fail:
1258 TALLOC_FREE(streams);
1259 return status;
1260 }
1261
1262 /**
1263 * Go through all the steps to validate a filename.
1264 *
1265 * @param ctx talloc_ctx to allocate memory with.
1266 * @param conn connection struct for vfs calls.
1267 * @param dfs_path Whether this path requires dfs resolution.
1268 * @param name_in The unconverted name.
1269 * @param ucf_flags flags to pass through to unix_convert().
1270 * UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1271 * p_cont_wcard != NULL and is true and
1272 * UCF_COND_ALLOW_WCARD_LCOMP.
1273 * @param p_cont_wcard If not NULL, will be set to true if the dfs path
1274 * resolution detects a wildcard.
1275 * @param pp_smb_fname The final converted name will be allocated if the
1276 * return is NT_STATUS_OK.
1277 *
1278 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1279 * error otherwise.
1280 */
1281 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1282 connection_struct *conn,
1283 bool dfs_path,
1284 const char *name_in,
1285 uint32_t ucf_flags,
1286 bool *ppath_contains_wcard,
1287 struct smb_filename **pp_smb_fname)
1288 {
1289 NTSTATUS status;
1290 bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1291 char *fname = NULL;
1292
1293 *pp_smb_fname = NULL;
1294
1295 status = resolve_dfspath_wcard(ctx, conn,
1296 dfs_path,
1297 name_in,
1298 allow_wcards,
1299 &fname,
1300 ppath_contains_wcard);
1301 if (!NT_STATUS_IS_OK(status)) {
1302 DEBUG(10,("filename_convert: resolve_dfspath failed "
1303 "for name %s with %s\n",
1304 name_in,
1305 nt_errstr(status) ));
1306 return status;
1307 }
1308
1309 if (is_fake_file_path(name_in)) {
1310 SMB_STRUCT_STAT st;
1311 ZERO_STRUCT(st);
1312 st.st_ex_nlink = 1;
1313 status = create_synthetic_smb_fname_split(ctx,
1314 name_in,
1315 &st,
1316 pp_smb_fname);
1317 return status;
1318 }
1319
1320 /*
1321 * If the caller conditionally allows wildcard lookups, only add the
1322 * always allow if the path actually does contain a wildcard.
1323 */
1324 if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1325 ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1326 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1327 }
1328
1329 status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1330 if (!NT_STATUS_IS_OK(status)) {
1331 DEBUG(10,("filename_convert: unix_convert failed "
1332 "for name %s with %s\n",
1333 fname,
1334 nt_errstr(status) ));
1335 return status;
1336 }
1337
1338 if ((ucf_flags & UCF_UNIX_NAME_LOOKUP) &&
1339 VALID_STAT((*pp_smb_fname)->st) &&
1340 S_ISLNK((*pp_smb_fname)->st.st_ex_mode)) {
1341 return check_veto_path(conn, (*pp_smb_fname)->base_name);
1342 }
1343
1344 status = check_name(conn, (*pp_smb_fname)->base_name);
1345 if (!NT_STATUS_IS_OK(status)) {
1346 DEBUG(3,("filename_convert: check_name failed "
1347 "for name %s with %s\n",
1348 smb_fname_str_dbg(*pp_smb_fname),
1349 nt_errstr(status) ));
1350 TALLOC_FREE(*pp_smb_fname);
1351 return status;
1352 }
1353
1354 return status;
1355 }
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