?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
shadow_copy2: add comment block explaining shadow_copy2_convert()
[Samba.git] / source3 / smbd / filename.c
blobba4198651752e02ec2313ef531b8752a82cca6e5
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 #include "smbd/globals.h"
32
33 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
34 connection_struct *conn,
35 const char *orig_path,
36 struct smb_filename *smb_fname);
37
38 /****************************************************************************
39 Mangle the 2nd name and check if it is then equal to the first name.
40 ****************************************************************************/
41
42 static bool mangled_equal(const char *name1,
43 const char *name2,
44 const struct share_params *p)
45 {
46 char mname[13];
47
48 if (!name_to_8_3(name2, mname, False, p)) {
49 return False;
50 }
51 return strequal(name1, mname);
52 }
53
54 /****************************************************************************
55 Cope with the differing wildcard and non-wildcard error cases.
56 ****************************************************************************/
57
58 static NTSTATUS determine_path_error(const char *name,
59 bool allow_wcard_last_component)
60 {
61 const char *p;
62
63 if (!allow_wcard_last_component) {
64 /* Error code within a pathname. */
65 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
66 }
67
68 /* We're terminating here so we
69 * can be a little slower and get
70 * the error code right. Windows
71 * treats the last part of the pathname
72 * separately I think, so if the last
73 * component is a wildcard then we treat
74 * this ./ as "end of component" */
75
76 p = strchr(name, '/');
77
78 if (!p && (ms_has_wild(name) || ISDOT(name))) {
79 /* Error code at the end of a pathname. */
80 return NT_STATUS_OBJECT_NAME_INVALID;
81 } else {
82 /* Error code within a pathname. */
83 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
84 }
85 }
86
87 static NTSTATUS check_for_dot_component(const struct smb_filename *smb_fname)
88 {
89 /* Ensure we catch all names with in "/."
90 this is disallowed under Windows and
91 in POSIX they've already been removed. */
92 const char *p = strstr(smb_fname->base_name, "/."); /*mb safe*/
93 if (p) {
94 if (p[2] == '/') {
95 /* Error code within a pathname. */
96 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
97 } else if (p[2] == '\0') {
98 /* Error code at the end of a pathname. */
99 return NT_STATUS_OBJECT_NAME_INVALID;
100 }
101 }
102 return NT_STATUS_OK;
103 }
104
105 /****************************************************************************
106 Optimization for common case where the missing part
107 is in the last component and the client already
108 sent the correct case.
109 Returns NT_STATUS_OK to mean continue the tree walk
110 (possibly with modified start pointer).
111 Any other NT_STATUS_XXX error means terminate the path
112 lookup here.
113 ****************************************************************************/
114
115 static NTSTATUS check_parent_exists(TALLOC_CTX *ctx,
116 connection_struct *conn,
117 bool posix_pathnames,
118 const struct smb_filename *smb_fname,
119 char **pp_dirpath,
120 char **pp_start)
121 {
122 struct smb_filename parent_fname;
123 const char *last_component = NULL;
124 NTSTATUS status;
125 int ret;
126
127 ZERO_STRUCT(parent_fname);
128 if (!parent_dirname(ctx, smb_fname->base_name,
129 &parent_fname.base_name,
130 &last_component)) {
131 return NT_STATUS_NO_MEMORY;
132 }
133
134 /*
135 * If there was no parent component in
136 * smb_fname->base_name of the parent name
137 * contained a wildcard then don't do this
138 * optimization.
139 */
140 if ((smb_fname->base_name == last_component) ||
141 ms_has_wild(parent_fname.base_name)) {
142 return NT_STATUS_OK;
143 }
144
145 if (posix_pathnames) {
146 ret = SMB_VFS_LSTAT(conn, &parent_fname);
147 } else {
148 ret = SMB_VFS_STAT(conn, &parent_fname);
149 }
150
151 /* If the parent stat failed, just continue
152 with the normal tree walk. */
153
154 if (ret == -1) {
155 return NT_STATUS_OK;
156 }
157
158 status = check_for_dot_component(&parent_fname);
159 if (!NT_STATUS_IS_OK(status)) {
160 return status;
161 }
162
163 /* Parent exists - set "start" to be the
164 * last compnent to shorten the tree walk. */
165
166 /*
167 * Safe to use discard_const_p
168 * here as last_component points
169 * into our smb_fname->base_name.
170 */
171 *pp_start = discard_const_p(char, last_component);
172
173 /* Update dirpath. */
174 TALLOC_FREE(*pp_dirpath);
175 *pp_dirpath = talloc_strdup(ctx, parent_fname.base_name);
176 if (!*pp_dirpath) {
177 return NT_STATUS_NO_MEMORY;
178 }
179
180 DEBUG(5,("check_parent_exists: name "
181 "= %s, dirpath = %s, "
182 "start = %s\n",
183 smb_fname->base_name,
184 *pp_dirpath,
185 *pp_start));
186
187 return NT_STATUS_OK;
188 }
189
190 /****************************************************************************
191 This routine is called to convert names from the dos namespace to unix
192 namespace. It needs to handle any case conversions, mangling, format changes,
193 streams etc.
194
195 We assume that we have already done a chdir() to the right "root" directory
196 for this service.
197
198 The function will return an NTSTATUS error if some part of the name except for
199 the last part cannot be resolved, else NT_STATUS_OK.
200
201 Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we
202 didn't get any fatal errors that should immediately terminate the calling SMB
203 processing whilst resolving.
204
205 If the UCF_SAVE_LCOMP flag is passed in, then the unmodified last component
206 of the pathname is set in smb_filename->original_lcomp.
207
208 If UCF_ALWAYS_ALLOW_WCARD_LCOMP is passed in, then a MS wildcard was detected
209 and should be allowed in the last component of the path only.
210
211 If the orig_path was a stream, smb_filename->base_name will point to the base
212 filename, and smb_filename->stream_name will point to the stream name. If
213 orig_path was not a stream, then smb_filename->stream_name will be NULL.
214
215 On exit from unix_convert, the smb_filename->st stat struct will be populated
216 if the file exists and was found, if not this stat struct will be filled with
217 zeros (and this can be detected by checking for nlinks = 0, which can never be
218 true for any file).
219 ****************************************************************************/
220
221 NTSTATUS unix_convert(TALLOC_CTX *ctx,
222 connection_struct *conn,
223 const char *orig_path,
224 struct smb_filename **smb_fname_out,
225 uint32_t ucf_flags)
226 {
227 struct smb_filename *smb_fname = NULL;
228 char *start, *end;
229 char *dirpath = NULL;
230 char *stream = NULL;
231 bool component_was_mangled = False;
232 bool name_has_wildcard = False;
233 bool posix_pathnames = false;
234 bool allow_wcard_last_component =
235 (ucf_flags & UCF_ALWAYS_ALLOW_WCARD_LCOMP);
236 bool save_last_component = ucf_flags & UCF_SAVE_LCOMP;
237 NTSTATUS status;
238 int ret = -1;
239
240 *smb_fname_out = NULL;
241
242 smb_fname = talloc_zero(ctx, struct smb_filename);
243 if (smb_fname == NULL) {
244 return NT_STATUS_NO_MEMORY;
245 }
246
247 if (conn->printer) {
248 /* we don't ever use the filenames on a printer share as a
249 filename - so don't convert them */
250 if (!(smb_fname->base_name = talloc_strdup(smb_fname,
251 orig_path))) {
252 status = NT_STATUS_NO_MEMORY;
253 goto err;
254 }
255 goto done;
256 }
257
258 DEBUG(5, ("unix_convert called on file \"%s\"\n", orig_path));
259
260 /*
261 * Conversion to basic unix format is already done in
262 * check_path_syntax().
263 */
264
265 /*
266 * Names must be relative to the root of the service - any leading /.
267 * and trailing /'s should have been trimmed by check_path_syntax().
268 */
269
270 #ifdef DEVELOPER
271 SMB_ASSERT(*orig_path != '/');
272 #endif
273
274 /*
275 * If we trimmed down to a single '\0' character
276 * then we should use the "." directory to avoid
277 * searching the cache, but not if we are in a
278 * printing share.
279 * As we know this is valid we can return true here.
280 */
281
282 if (!*orig_path) {
283 if (!(smb_fname->base_name = talloc_strdup(smb_fname, "."))) {
284 status = NT_STATUS_NO_MEMORY;
285 goto err;
286 }
287 if (SMB_VFS_STAT(conn, smb_fname) != 0) {
288 status = map_nt_error_from_unix(errno);
289 goto err;
290 }
291 DEBUG(5, ("conversion finished \"\" -> %s\n",
292 smb_fname->base_name));
293 goto done;
294 }
295
296 if (orig_path[0] == '.' && (orig_path[1] == '/' ||
297 orig_path[1] == '\0')) {
298 /* Start of pathname can't be "." only. */
299 if (orig_path[1] == '\0' || orig_path[2] == '\0') {
300 status = NT_STATUS_OBJECT_NAME_INVALID;
301 } else {
302 status =determine_path_error(&orig_path[2],
303 allow_wcard_last_component);
304 }
305 goto err;
306 }
307
308 /* Start with the full orig_path as given by the caller. */
309 if (!(smb_fname->base_name = talloc_strdup(smb_fname, orig_path))) {
310 DEBUG(0, ("talloc_strdup failed\n"));
311 status = NT_STATUS_NO_MEMORY;
312 goto err;
313 }
314
315 /*
316 * Large directory fix normalization. If we're case sensitive, and
317 * the case preserving parameters are set to "no", normalize the case of
318 * the incoming filename from the client WHETHER IT EXISTS OR NOT !
319 * This is in conflict with the current (3.0.20) man page, but is
320 * what people expect from the "large directory howto". I'll update
321 * the man page. Thanks to jht@samba.org for finding this. JRA.
322 */
323
324 if (conn->case_sensitive && !conn->case_preserve &&
325 !conn->short_case_preserve) {
326 if (!strnorm(smb_fname->base_name, lp_defaultcase(SNUM(conn)))) {
327 DEBUG(0, ("strnorm %s failed\n", smb_fname->base_name));
328 status = NT_STATUS_INVALID_PARAMETER;
329 goto err;
330 }
331 }
332
333 /*
334 * Ensure saved_last_component is valid even if file exists.
335 */
336
337 if(save_last_component) {
338 end = strrchr_m(smb_fname->base_name, '/');
339 if (end) {
340 smb_fname->original_lcomp = talloc_strdup(smb_fname,
341 end + 1);
342 } else {
343 smb_fname->original_lcomp =
344 talloc_strdup(smb_fname, smb_fname->base_name);
345 }
346 if (smb_fname->original_lcomp == NULL) {
347 status = NT_STATUS_NO_MEMORY;
348 goto err;
349 }
350 }
351
352 posix_pathnames = (lp_posix_pathnames() ||
353 (ucf_flags & UCF_POSIX_PATHNAMES));
354
355 /*
356 * Strip off the stream, and add it back when we're done with the
357 * base_name.
358 */
359 if (!posix_pathnames) {
360 stream = strchr_m(smb_fname->base_name, ':');
361
362 if (stream != NULL) {
363 char *tmp = talloc_strdup(smb_fname, stream);
364 if (tmp == NULL) {
365 status = NT_STATUS_NO_MEMORY;
366 goto err;
367 }
368 /*
369 * Since this is actually pointing into
370 * smb_fname->base_name this truncates base_name.
371 */
372 *stream = '\0';
373 stream = tmp;
374 }
375 }
376
377 start = smb_fname->base_name;
378
379 /*
380 * If we're providing case insensitive semantics or
381 * the underlying filesystem is case insensitive,
382 * then a case-normalized hit in the stat-cache is
383 * authoratitive. JRA.
384 *
385 * Note: We're only checking base_name. The stream_name will be
386 * added and verified in build_stream_path().
387 */
388
389 if((!conn->case_sensitive || !(conn->fs_capabilities &
390 FILE_CASE_SENSITIVE_SEARCH)) &&
391 stat_cache_lookup(conn, posix_pathnames, &smb_fname->base_name, &dirpath, &start,
392 &smb_fname->st)) {
393 goto done;
394 }
395
396 /*
397 * Make sure "dirpath" is an allocated string, we use this for
398 * building the directories with talloc_asprintf and free it.
399 */
400
401 if ((dirpath == NULL) && (!(dirpath = talloc_strdup(ctx,"")))) {
402 DEBUG(0, ("talloc_strdup failed\n"));
403 status = NT_STATUS_NO_MEMORY;
404 goto err;
405 }
406
407 /*
408 * If we have a wildcard we must walk the path to
409 * find where the error is, even if case sensitive
410 * is true.
411 */
412
413 name_has_wildcard = ms_has_wild(smb_fname->base_name);
414 if (name_has_wildcard && !allow_wcard_last_component) {
415 /* Wildcard not valid anywhere. */
416 status = NT_STATUS_OBJECT_NAME_INVALID;
417 goto fail;
418 }
419
420 DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n",
421 smb_fname->base_name, dirpath, start));
422
423 if (!name_has_wildcard) {
424 /*
425 * stat the name - if it exists then we can add the stream back (if
426 * there was one) and be done!
427 */
428
429 if (posix_pathnames) {
430 ret = SMB_VFS_LSTAT(conn, smb_fname);
431 } else {
432 ret = SMB_VFS_STAT(conn, smb_fname);
433 }
434
435 if (ret == 0) {
436 status = check_for_dot_component(smb_fname);
437 if (!NT_STATUS_IS_OK(status)) {
438 goto fail;
439 }
440 /* Add the path (not including the stream) to the cache. */
441 stat_cache_add(orig_path, smb_fname->base_name,
442 conn->case_sensitive);
443 DEBUG(5,("conversion of base_name finished %s -> %s\n",
444 orig_path, smb_fname->base_name));
445 goto done;
446 }
447
448 /* Stat failed - ensure we don't use it. */
449 SET_STAT_INVALID(smb_fname->st);
450
451 if (errno == ENOENT) {
452 /* Optimization when creating a new file - only
453 the last component doesn't exist.
454 NOTE : check_parent_exists() doesn't preserve errno.
455 */
456 int saved_errno = errno;
457 status = check_parent_exists(ctx,
458 conn,
459 posix_pathnames,
460 smb_fname,
461 &dirpath,
462 &start);
463 errno = saved_errno;
464 if (!NT_STATUS_IS_OK(status)) {
465 goto fail;
466 }
467 }
468
469 /*
470 * A special case - if we don't have any wildcards or mangling chars and are case
471 * sensitive or the underlying filesystem is case insensitive then searching
472 * won't help.
473 */
474
475 if ((conn->case_sensitive || !(conn->fs_capabilities &
476 FILE_CASE_SENSITIVE_SEARCH)) &&
477 !mangle_is_mangled(smb_fname->base_name, conn->params)) {
478
479 status = check_for_dot_component(smb_fname);
480 if (!NT_STATUS_IS_OK(status)) {
481 goto fail;
482 }
483
484 /*
485 * The stat failed. Could be ok as it could be
486 * a new file.
487 */
488
489 if (errno == ENOTDIR || errno == ELOOP) {
490 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
491 goto fail;
492 } else if (errno == ENOENT) {
493 /*
494 * Was it a missing last component ?
495 * or a missing intermediate component ?
496 */
497 struct smb_filename parent_fname;
498 const char *last_component = NULL;
499
500 ZERO_STRUCT(parent_fname);
501 if (!parent_dirname(ctx, smb_fname->base_name,
502 &parent_fname.base_name,
503 &last_component)) {
504 status = NT_STATUS_NO_MEMORY;
505 goto fail;
506 }
507 if (posix_pathnames) {
508 ret = SMB_VFS_LSTAT(conn, &parent_fname);
509 } else {
510 ret = SMB_VFS_STAT(conn, &parent_fname);
511 }
512 if (ret == -1) {
513 if (errno == ENOTDIR ||
514 errno == ENOENT ||
515 errno == ELOOP) {
516 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
517 goto fail;
518 }
519 }
520
521 /*
522 * Missing last component is ok - new file.
523 * Also deal with permission denied elsewhere.
524 * Just drop out to done.
525 */
526 goto done;
527 }
528 }
529 } else {
530 /*
531 * We have a wildcard in the pathname.
532 *
533 * Optimization for common case where the wildcard
534 * is in the last component and the client already
535 * sent the correct case.
536 * NOTE : check_parent_exists() doesn't preserve errno.
537 */
538 int saved_errno = errno;
539 status = check_parent_exists(ctx,
540 conn,
541 posix_pathnames,
542 smb_fname,
543 &dirpath,
544 &start);
545 errno = saved_errno;
546 if (!NT_STATUS_IS_OK(status)) {
547 goto fail;
548 }
549 }
550
551 /*
552 * is_mangled() was changed to look at an entire pathname, not
553 * just a component. JRA.
554 */
555
556 if (mangle_is_mangled(start, conn->params)) {
557 component_was_mangled = True;
558 }
559
560 /*
561 * Now we need to recursively match the name against the real
562 * directory structure.
563 */
564
565 /*
566 * Match each part of the path name separately, trying the names
567 * as is first, then trying to scan the directory for matching names.
568 */
569
570 for (; start ; start = (end?end+1:(char *)NULL)) {
571 /*
572 * Pinpoint the end of this section of the filename.
573 */
574 /* mb safe. '/' can't be in any encoded char. */
575 end = strchr(start, '/');
576
577 /*
578 * Chop the name at this point.
579 */
580 if (end) {
581 *end = 0;
582 }
583
584 if (save_last_component) {
585 TALLOC_FREE(smb_fname->original_lcomp);
586 smb_fname->original_lcomp = talloc_strdup(smb_fname,
587 end ? end + 1 : start);
588 if (!smb_fname->original_lcomp) {
589 DEBUG(0, ("talloc failed\n"));
590 status = NT_STATUS_NO_MEMORY;
591 goto err;
592 }
593 }
594
595 /* The name cannot have a component of "." */
596
597 if (ISDOT(start)) {
598 if (!end) {
599 /* Error code at the end of a pathname. */
600 status = NT_STATUS_OBJECT_NAME_INVALID;
601 } else {
602 status = determine_path_error(end+1,
603 allow_wcard_last_component);
604 }
605 goto fail;
606 }
607
608 /* The name cannot have a wildcard if it's not
609 the last component. */
610
611 name_has_wildcard = ms_has_wild(start);
612
613 /* Wildcards never valid within a pathname. */
614 if (name_has_wildcard && end) {
615 status = NT_STATUS_OBJECT_NAME_INVALID;
616 goto fail;
617 }
618
619 /* Skip the stat call if it's a wildcard end. */
620 if (name_has_wildcard) {
621 DEBUG(5,("Wildcard %s\n",start));
622 goto done;
623 }
624
625 /*
626 * Check if the name exists up to this point.
627 */
628
629 if (posix_pathnames) {
630 ret = SMB_VFS_LSTAT(conn, smb_fname);
631 } else {
632 ret = SMB_VFS_STAT(conn, smb_fname);
633 }
634
635 if (ret == 0) {
636 /*
637 * It exists. it must either be a directory or this must
638 * be the last part of the path for it to be OK.
639 */
640 if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
641 /*
642 * An intermediate part of the name isn't
643 * a directory.
644 */
645 DEBUG(5,("Not a dir %s\n",start));
646 *end = '/';
647 /*
648 * We need to return the fact that the
649 * intermediate name resolution failed. This
650 * is used to return an error of ERRbadpath
651 * rather than ERRbadfile. Some Windows
652 * applications depend on the difference between
653 * these two errors.
654 */
655 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
656 goto fail;
657 }
658
659 } else {
660 char *found_name = NULL;
661
662 /* Stat failed - ensure we don't use it. */
663 SET_STAT_INVALID(smb_fname->st);
664
665 /*
666 * Reset errno so we can detect
667 * directory open errors.
668 */
669 errno = 0;
670
671 /*
672 * Try to find this part of the path in the directory.
673 */
674
675 if (name_has_wildcard ||
676 (get_real_filename(conn, dirpath, start,
677 talloc_tos(),
678 &found_name) == -1)) {
679 char *unmangled;
680
681 if (end) {
682 /*
683 * An intermediate part of the name
684 * can't be found.
685 */
686 DEBUG(5,("Intermediate not found %s\n",
687 start));
688 *end = '/';
689
690 /*
691 * We need to return the fact that the
692 * intermediate name resolution failed.
693 * This is used to return an error of
694 * ERRbadpath rather than ERRbadfile.
695 * Some Windows applications depend on
696 * the difference between these two
697 * errors.
698 */
699
700 /*
701 * ENOENT, ENOTDIR and ELOOP all map
702 * to NT_STATUS_OBJECT_PATH_NOT_FOUND
703 * in the filename walk.
704 */
705
706 if (errno == ENOENT ||
707 errno == ENOTDIR ||
708 errno == ELOOP) {
709 status =
710 NT_STATUS_OBJECT_PATH_NOT_FOUND;
711 }
712 else {
713 status =
714 map_nt_error_from_unix(errno);
715 }
716 goto fail;
717 }
718
719 /*
720 * ENOENT/EACCESS are the only valid errors
721 * here.
722 */
723
724 if (errno == EACCES) {
725 if ((ucf_flags & UCF_PREP_CREATEFILE) == 0) {
726 status = NT_STATUS_ACCESS_DENIED;
727 goto fail;
728 } else {
729 /*
730 * This is the dropbox
731 * behaviour. A dropbox is a
732 * directory with only -wx
733 * permissions, so
734 * get_real_filename fails
735 * with EACCESS, it needs to
736 * list the directory. We
737 * nevertheless want to allow
738 * users creating a file.
739 */
740 errno = 0;
741 }
742 }
743
744 if ((errno != 0) && (errno != ENOENT)) {
745 /*
746 * ENOTDIR and ELOOP both map to
747 * NT_STATUS_OBJECT_PATH_NOT_FOUND
748 * in the filename walk.
749 */
750 if (errno == ENOTDIR ||
751 errno == ELOOP) {
752 status =
753 NT_STATUS_OBJECT_PATH_NOT_FOUND;
754 } else {
755 status =
756 map_nt_error_from_unix(errno);
757 }
758 goto fail;
759 }
760
761 /*
762 * Just the last part of the name doesn't exist.
763 * We need to strupper() or strlower() it as
764 * this conversion may be used for file creation
765 * purposes. Fix inspired by
766 * Thomas Neumann <t.neumann@iku-ag.de>.
767 */
768 if (!conn->case_preserve ||
769 (mangle_is_8_3(start, False,
770 conn->params) &&
771 !conn->short_case_preserve)) {
772 if (!strnorm(start,
773 lp_defaultcase(SNUM(conn)))) {
774 DEBUG(0, ("strnorm %s failed\n",
775 start));
776 status = NT_STATUS_INVALID_PARAMETER;
777 goto err;
778 }
779 }
780
781 /*
782 * check on the mangled stack to see if we can
783 * recover the base of the filename.
784 */
785
786 if (mangle_is_mangled(start, conn->params)
787 && mangle_lookup_name_from_8_3(ctx,
788 start,
789 &unmangled,
790 conn->params)) {
791 char *tmp;
792 size_t start_ofs =
793 start - smb_fname->base_name;
794
795 if (*dirpath != '\0') {
796 tmp = talloc_asprintf(
797 smb_fname, "%s/%s",
798 dirpath, unmangled);
799 TALLOC_FREE(unmangled);
800 }
801 else {
802 tmp = unmangled;
803 }
804 if (tmp == NULL) {
805 DEBUG(0, ("talloc failed\n"));
806 status = NT_STATUS_NO_MEMORY;
807 goto err;
808 }
809 TALLOC_FREE(smb_fname->base_name);
810 smb_fname->base_name = tmp;
811 start =
812 smb_fname->base_name + start_ofs;
813 end = start + strlen(start);
814 }
815
816 DEBUG(5,("New file %s\n",start));
817 goto done;
818 }
819
820
821 /*
822 * Restore the rest of the string. If the string was
823 * mangled the size may have changed.
824 */
825 if (end) {
826 char *tmp;
827 size_t start_ofs =
828 start - smb_fname->base_name;
829
830 if (*dirpath != '\0') {
831 tmp = talloc_asprintf(smb_fname,
832 "%s/%s/%s", dirpath,
833 found_name, end+1);
834 }
835 else {
836 tmp = talloc_asprintf(smb_fname,
837 "%s/%s", found_name,
838 end+1);
839 }
840 if (tmp == NULL) {
841 DEBUG(0, ("talloc_asprintf failed\n"));
842 status = NT_STATUS_NO_MEMORY;
843 goto err;
844 }
845 TALLOC_FREE(smb_fname->base_name);
846 smb_fname->base_name = tmp;
847 start = smb_fname->base_name + start_ofs;
848 end = start + strlen(found_name);
849 *end = '\0';
850 } else {
851 char *tmp;
852 size_t start_ofs =
853 start - smb_fname->base_name;
854
855 if (*dirpath != '\0') {
856 tmp = talloc_asprintf(smb_fname,
857 "%s/%s", dirpath,
858 found_name);
859 } else {
860 tmp = talloc_strdup(smb_fname,
861 found_name);
862 }
863 if (tmp == NULL) {
864 DEBUG(0, ("talloc failed\n"));
865 status = NT_STATUS_NO_MEMORY;
866 goto err;
867 }
868 TALLOC_FREE(smb_fname->base_name);
869 smb_fname->base_name = tmp;
870 start = smb_fname->base_name + start_ofs;
871
872 /*
873 * We just scanned for, and found the end of
874 * the path. We must return a valid stat struct
875 * if it exists. JRA.
876 */
877
878 if (posix_pathnames) {
879 ret = SMB_VFS_LSTAT(conn, smb_fname);
880 } else {
881 ret = SMB_VFS_STAT(conn, smb_fname);
882 }
883
884 if (ret != 0) {
885 SET_STAT_INVALID(smb_fname->st);
886 }
887 }
888
889 TALLOC_FREE(found_name);
890 } /* end else */
891
892 #ifdef DEVELOPER
893 /*
894 * This sucks!
895 * We should never provide different behaviors
896 * depending on DEVELOPER!!!
897 */
898 if (VALID_STAT(smb_fname->st)) {
899 bool delete_pending;
900 uint32_t name_hash;
901
902 status = file_name_hash(conn,
903 smb_fname_str_dbg(smb_fname),
904 &name_hash);
905 if (!NT_STATUS_IS_OK(status)) {
906 goto fail;
907 }
908
909 get_file_infos(vfs_file_id_from_sbuf(conn,
910 &smb_fname->st),
911 name_hash,
912 &delete_pending, NULL);
913 if (delete_pending) {
914 status = NT_STATUS_DELETE_PENDING;
915 goto fail;
916 }
917 }
918 #endif
919
920 /*
921 * Add to the dirpath that we have resolved so far.
922 */
923
924 if (*dirpath != '\0') {
925 char *tmp = talloc_asprintf(ctx,
926 "%s/%s", dirpath, start);
927 if (!tmp) {
928 DEBUG(0, ("talloc_asprintf failed\n"));
929 status = NT_STATUS_NO_MEMORY;
930 goto err;
931 }
932 TALLOC_FREE(dirpath);
933 dirpath = tmp;
934 }
935 else {
936 TALLOC_FREE(dirpath);
937 if (!(dirpath = talloc_strdup(ctx,start))) {
938 DEBUG(0, ("talloc_strdup failed\n"));
939 status = NT_STATUS_NO_MEMORY;
940 goto err;
941 }
942 }
943
944 /*
945 * Cache the dirpath thus far. Don't cache a name with mangled
946 * or wildcard components as this can change the size.
947 */
948 if(!component_was_mangled && !name_has_wildcard) {
949 stat_cache_add(orig_path, dirpath,
950 conn->case_sensitive);
951 }
952
953 /*
954 * Restore the / that we wiped out earlier.
955 */
956 if (end) {
957 *end = '/';
958 }
959 }
960
961 /*
962 * Cache the full path. Don't cache a name with mangled or wildcard
963 * components as this can change the size.
964 */
965
966 if(!component_was_mangled && !name_has_wildcard) {
967 stat_cache_add(orig_path, smb_fname->base_name,
968 conn->case_sensitive);
969 }
970
971 /*
972 * The name has been resolved.
973 */
974
975 DEBUG(5,("conversion finished %s -> %s\n", orig_path,
976 smb_fname->base_name));
977
978 done:
979 /* Add back the stream if one was stripped off originally. */
980 if (stream != NULL) {
981 smb_fname->stream_name = stream;
982
983 /* Check path now that the base_name has been converted. */
984 status = build_stream_path(ctx, conn, orig_path, smb_fname);
985 if (!NT_STATUS_IS_OK(status)) {
986 goto fail;
987 }
988 }
989 TALLOC_FREE(dirpath);
990 *smb_fname_out = smb_fname;
991 return NT_STATUS_OK;
992 fail:
993 DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
994 if (*dirpath != '\0') {
995 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
996 dirpath, start);
997 } else {
998 smb_fname->base_name = talloc_strdup(smb_fname, start);
999 }
1000 if (!smb_fname->base_name) {
1001 DEBUG(0, ("talloc_asprintf failed\n"));
1002 status = NT_STATUS_NO_MEMORY;
1003 goto err;
1004 }
1005
1006 *smb_fname_out = smb_fname;
1007 TALLOC_FREE(dirpath);
1008 return status;
1009 err:
1010 TALLOC_FREE(smb_fname);
1011 return status;
1012 }
1013
1014 /****************************************************************************
1015 Ensure a path is not vetod.
1016 ****************************************************************************/
1017
1018 NTSTATUS check_veto_path(connection_struct *conn, const char *name)
1019 {
1020 if (IS_VETO_PATH(conn, name)) {
1021 /* Is it not dot or dot dot. */
1022 if (!(ISDOT(name) || ISDOTDOT(name))) {
1023 DEBUG(5,("check_veto_path: file path name %s vetoed\n",
1024 name));
1025 return map_nt_error_from_unix(ENOENT);
1026 }
1027 }
1028 return NT_STATUS_OK;
1029 }
1030
1031 /****************************************************************************
1032 Check a filename - possibly calling check_reduced_name.
1033 This is called by every routine before it allows an operation on a filename.
1034 It does any final confirmation necessary to ensure that the filename is
1035 a valid one for the user to access.
1036 ****************************************************************************/
1037
1038 NTSTATUS check_name(connection_struct *conn, const char *name)
1039 {
1040 NTSTATUS status = check_veto_path(conn, name);
1041
1042 if (!NT_STATUS_IS_OK(status)) {
1043 return status;
1044 }
1045
1046 if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
1047 status = check_reduced_name(conn,name);
1048 if (!NT_STATUS_IS_OK(status)) {
1049 DEBUG(5,("check_name: name %s failed with %s\n",name,
1050 nt_errstr(status)));
1051 return status;
1052 }
1053 }
1054
1055 return NT_STATUS_OK;
1056 }
1057
1058 /****************************************************************************
1059 Must be called as root. Creates the struct privilege_paths
1060 attached to the struct smb_request if this call is successful.
1061 ****************************************************************************/
1062
1063 static NTSTATUS check_name_with_privilege(connection_struct *conn,
1064 struct smb_request *smbreq,
1065 const char *name)
1066 {
1067 NTSTATUS status = check_veto_path(conn, name);
1068
1069 if (!NT_STATUS_IS_OK(status)) {
1070 return status;
1071 }
1072 return check_reduced_name_with_privilege(conn,
1073 name,
1074 smbreq);
1075 }
1076
1077 /****************************************************************************
1078 Check if two filenames are equal.
1079 This needs to be careful about whether we are case sensitive.
1080 ****************************************************************************/
1081
1082 static bool fname_equal(const char *name1, const char *name2,
1083 bool case_sensitive)
1084 {
1085 /* Normal filename handling */
1086 if (case_sensitive) {
1087 return(strcmp(name1,name2) == 0);
1088 }
1089
1090 return(strequal(name1,name2));
1091 }
1092
1093 /****************************************************************************
1094 Scan a directory to find a filename, matching without case sensitivity.
1095 If the name looks like a mangled name then try via the mangling functions
1096 ****************************************************************************/
1097
1098 static int get_real_filename_full_scan(connection_struct *conn,
1099 const char *path, const char *name,
1100 bool mangled,
1101 TALLOC_CTX *mem_ctx, char **found_name)
1102 {
1103 struct smb_Dir *cur_dir;
1104 const char *dname = NULL;
1105 char *talloced = NULL;
1106 char *unmangled_name = NULL;
1107 long curpos;
1108
1109 /* handle null paths */
1110 if ((path == NULL) || (*path == 0)) {
1111 path = ".";
1112 }
1113
1114 /* If we have a case-sensitive filesystem, it doesn't do us any
1115 * good to search for a name. If a case variation of the name was
1116 * there, then the original stat(2) would have found it.
1117 */
1118 if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1119 errno = ENOENT;
1120 return -1;
1121 }
1122
1123 /*
1124 * The incoming name can be mangled, and if we de-mangle it
1125 * here it will not compare correctly against the filename (name2)
1126 * read from the directory and then mangled by the name_to_8_3()
1127 * call. We need to mangle both names or neither.
1128 * (JRA).
1129 *
1130 * Fix for bug found by Dina Fine. If in case sensitive mode then
1131 * the mangle cache is no good (3 letter extension could be wrong
1132 * case - so don't demangle in this case - leave as mangled and
1133 * allow the mangling of the directory entry read (which is done
1134 * case insensitively) to match instead. This will lead to more
1135 * false positive matches but we fail completely without it. JRA.
1136 */
1137
1138 if (mangled && !conn->case_sensitive) {
1139 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1140 &unmangled_name,
1141 conn->params);
1142 if (!mangled) {
1143 /* Name is now unmangled. */
1144 name = unmangled_name;
1145 }
1146 }
1147
1148 /* open the directory */
1149 if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1150 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1151 TALLOC_FREE(unmangled_name);
1152 return -1;
1153 }
1154
1155 /* now scan for matching names */
1156 curpos = 0;
1157 while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1158
1159 /* Is it dot or dot dot. */
1160 if (ISDOT(dname) || ISDOTDOT(dname)) {
1161 TALLOC_FREE(talloced);
1162 continue;
1163 }
1164
1165 /*
1166 * At this point dname is the unmangled name.
1167 * name is either mangled or not, depending on the state
1168 * of the "mangled" variable. JRA.
1169 */
1170
1171 /*
1172 * Check mangled name against mangled name, or unmangled name
1173 * against unmangled name.
1174 */
1175
1176 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1177 fname_equal(name, dname, conn->case_sensitive)) {
1178 /* we've found the file, change it's name and return */
1179 *found_name = talloc_strdup(mem_ctx, dname);
1180 TALLOC_FREE(unmangled_name);
1181 TALLOC_FREE(cur_dir);
1182 if (!*found_name) {
1183 errno = ENOMEM;
1184 TALLOC_FREE(talloced);
1185 return -1;
1186 }
1187 TALLOC_FREE(talloced);
1188 return 0;
1189 }
1190 TALLOC_FREE(talloced);
1191 }
1192
1193 TALLOC_FREE(unmangled_name);
1194 TALLOC_FREE(cur_dir);
1195 errno = ENOENT;
1196 return -1;
1197 }
1198
1199 /****************************************************************************
1200 Wrapper around the vfs get_real_filename and the full directory scan
1201 fallback.
1202 ****************************************************************************/
1203
1204 int get_real_filename(connection_struct *conn, const char *path,
1205 const char *name, TALLOC_CTX *mem_ctx,
1206 char **found_name)
1207 {
1208 int ret;
1209 bool mangled;
1210
1211 mangled = mangle_is_mangled(name, conn->params);
1212
1213 if (mangled) {
1214 return get_real_filename_full_scan(conn, path, name, mangled,
1215 mem_ctx, found_name);
1216 }
1217
1218 /* Try the vfs first to take advantage of case-insensitive stat. */
1219 ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1220
1221 /*
1222 * If the case-insensitive stat was successful, or returned an error
1223 * other than EOPNOTSUPP then there is no need to fall back on the
1224 * full directory scan.
1225 */
1226 if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1227 return ret;
1228 }
1229
1230 return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1231 found_name);
1232 }
1233
1234 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1235 connection_struct *conn,
1236 const char *orig_path,
1237 struct smb_filename *smb_fname)
1238 {
1239 NTSTATUS status;
1240 unsigned int i, num_streams = 0;
1241 struct stream_struct *streams = NULL;
1242
1243 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1244 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1245 return NT_STATUS_OK;
1246 }
1247
1248 if (errno != ENOENT) {
1249 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1250 status = map_nt_error_from_unix(errno);
1251 goto fail;
1252 }
1253
1254 /* Fall back to a case-insensitive scan of all streams on the file. */
1255 status = vfs_streaminfo(conn, NULL, smb_fname->base_name, mem_ctx,
1256 &num_streams, &streams);
1257
1258 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1259 SET_STAT_INVALID(smb_fname->st);
1260 return NT_STATUS_OK;
1261 }
1262
1263 if (!NT_STATUS_IS_OK(status)) {
1264 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1265 goto fail;
1266 }
1267
1268 for (i=0; i<num_streams; i++) {
1269 DEBUG(10, ("comparing [%s] and [%s]: ",
1270 smb_fname->stream_name, streams[i].name));
1271 if (fname_equal(smb_fname->stream_name, streams[i].name,
1272 conn->case_sensitive)) {
1273 DEBUGADD(10, ("equal\n"));
1274 break;
1275 }
1276 DEBUGADD(10, ("not equal\n"));
1277 }
1278
1279 /* Couldn't find the stream. */
1280 if (i == num_streams) {
1281 SET_STAT_INVALID(smb_fname->st);
1282 TALLOC_FREE(streams);
1283 return NT_STATUS_OK;
1284 }
1285
1286 DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1287 smb_fname->stream_name, streams[i].name));
1288
1289
1290 TALLOC_FREE(smb_fname->stream_name);
1291 smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1292 if (smb_fname->stream_name == NULL) {
1293 status = NT_STATUS_NO_MEMORY;
1294 goto fail;
1295 }
1296
1297 SET_STAT_INVALID(smb_fname->st);
1298
1299 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1300 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1301 }
1302 status = NT_STATUS_OK;
1303 fail:
1304 TALLOC_FREE(streams);
1305 return status;
1306 }
1307
1308 /**
1309 * Go through all the steps to validate a filename.
1310 *
1311 * @param ctx talloc_ctx to allocate memory with.
1312 * @param conn connection struct for vfs calls.
1313 * @param dfs_path Whether this path requires dfs resolution.
1314 * @param smbreq SMB request if we're using privileges.
1315 * @param name_in The unconverted name.
1316 * @param ucf_flags flags to pass through to unix_convert().
1317 * UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1318 * p_cont_wcard != NULL and is true and
1319 * UCF_COND_ALLOW_WCARD_LCOMP.
1320 * @param p_cont_wcard If not NULL, will be set to true if the dfs path
1321 * resolution detects a wildcard.
1322 * @param pp_smb_fname The final converted name will be allocated if the
1323 * return is NT_STATUS_OK.
1324 *
1325 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1326 * error otherwise.
1327 */
1328 static NTSTATUS filename_convert_internal(TALLOC_CTX *ctx,
1329 connection_struct *conn,
1330 bool dfs_path,
1331 struct smb_request *smbreq,
1332 const char *name_in,
1333 uint32_t ucf_flags,
1334 bool *ppath_contains_wcard,
1335 struct smb_filename **pp_smb_fname)
1336 {
1337 NTSTATUS status;
1338 bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1339 char *fname = NULL;
1340
1341 *pp_smb_fname = NULL;
1342
1343 status = resolve_dfspath_wcard(ctx, conn,
1344 dfs_path,
1345 name_in,
1346 allow_wcards,
1347 !conn->sconn->using_smb2,
1348 &fname,
1349 ppath_contains_wcard);
1350 if (!NT_STATUS_IS_OK(status)) {
1351 DEBUG(10,("filename_convert_internal: resolve_dfspath failed "
1352 "for name %s with %s\n",
1353 name_in,
1354 nt_errstr(status) ));
1355 return status;
1356 }
1357
1358 if (is_fake_file_path(name_in)) {
1359 SMB_STRUCT_STAT st;
1360 ZERO_STRUCT(st);
1361 st.st_ex_nlink = 1;
1362 status = create_synthetic_smb_fname_split(ctx,
1363 name_in,
1364 &st,
1365 pp_smb_fname);
1366 return status;
1367 }
1368
1369 /*
1370 * If the caller conditionally allows wildcard lookups, only add the
1371 * always allow if the path actually does contain a wildcard.
1372 */
1373 if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1374 ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1375 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1376 }
1377
1378 status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1379 if (!NT_STATUS_IS_OK(status)) {
1380 DEBUG(10,("filename_convert_internal: unix_convert failed "
1381 "for name %s with %s\n",
1382 fname,
1383 nt_errstr(status) ));
1384 return status;
1385 }
1386
1387 if ((ucf_flags & UCF_UNIX_NAME_LOOKUP) &&
1388 VALID_STAT((*pp_smb_fname)->st) &&
1389 S_ISLNK((*pp_smb_fname)->st.st_ex_mode)) {
1390 return check_veto_path(conn, (*pp_smb_fname)->base_name);
1391 }
1392
1393 if (!smbreq) {
1394 status = check_name(conn, (*pp_smb_fname)->base_name);
1395 } else {
1396 status = check_name_with_privilege(conn, smbreq, (*pp_smb_fname)->base_name);
1397 }
1398 if (!NT_STATUS_IS_OK(status)) {
1399 DEBUG(3,("filename_convert_internal: check_name failed "
1400 "for name %s with %s\n",
1401 smb_fname_str_dbg(*pp_smb_fname),
1402 nt_errstr(status) ));
1403 TALLOC_FREE(*pp_smb_fname);
1404 return status;
1405 }
1406
1407 return status;
1408 }
1409
1410 /*
1411 * Go through all the steps to validate a filename.
1412 * Non-root version.
1413 */
1414
1415 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1416 connection_struct *conn,
1417 bool dfs_path,
1418 const char *name_in,
1419 uint32_t ucf_flags,
1420 bool *ppath_contains_wcard,
1421 struct smb_filename **pp_smb_fname)
1422 {
1423 return filename_convert_internal(ctx,
1424 conn,
1425 dfs_path,
1426 NULL,
1427 name_in,
1428 ucf_flags,
1429 ppath_contains_wcard,
1430 pp_smb_fname);
1431 }
1432
1433 /*
1434 * Go through all the steps to validate a filename.
1435 * root (privileged) version.
1436 */
1437
1438 NTSTATUS filename_convert_with_privilege(TALLOC_CTX *ctx,
1439 connection_struct *conn,
1440 struct smb_request *smbreq,
1441 const char *name_in,
1442 uint32_t ucf_flags,
1443 bool *ppath_contains_wcard,
1444 struct smb_filename **pp_smb_fname)
1445 {
1446 return filename_convert_internal(ctx,
1447 conn,
1448 smbreq->flags2 & FLAGS2_DFS_PATHNAMES,
1449 smbreq,
1450 name_in,
1451 ucf_flags,
1452 ppath_contains_wcard,
1453 pp_smb_fname);
1454 }
Samba GIT mirror