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Add support for VFS op streaminfo chaining in all relevant VFS modules.
[Samba.git] / source3 / smbd / filename.c
blobec9ca20e32ce00a03d9c664dbec7af8f2a1e545c
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, &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 status = check_parent_exists(ctx,
450 conn,
451 posix_pathnames,
452 smb_fname,
453 &dirpath,
454 &start);
455 if (!NT_STATUS_IS_OK(status)) {
456 goto fail;
457 }
458 }
459
460 /*
461 * A special case - if we don't have any wildcards or mangling chars and are case
462 * sensitive or the underlying filesystem is case insensitive then searching
463 * won't help.
464 */
465
466 if ((conn->case_sensitive || !(conn->fs_capabilities &
467 FILE_CASE_SENSITIVE_SEARCH)) &&
468 !mangle_is_mangled(smb_fname->base_name, conn->params)) {
469
470 status = check_for_dot_component(smb_fname);
471 if (!NT_STATUS_IS_OK(status)) {
472 goto fail;
473 }
474
475 /*
476 * The stat failed. Could be ok as it could be
477 * a new file.
478 */
479
480 if (errno == ENOTDIR || errno == ELOOP) {
481 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
482 goto fail;
483 } else if (errno == ENOENT) {
484 /*
485 * Was it a missing last component ?
486 * or a missing intermediate component ?
487 */
488 struct smb_filename parent_fname;
489 const char *last_component = NULL;
490
491 ZERO_STRUCT(parent_fname);
492 if (!parent_dirname(ctx, smb_fname->base_name,
493 &parent_fname.base_name,
494 &last_component)) {
495 status = NT_STATUS_NO_MEMORY;
496 goto fail;
497 }
498 if (posix_pathnames) {
499 ret = SMB_VFS_LSTAT(conn, &parent_fname);
500 } else {
501 ret = SMB_VFS_STAT(conn, &parent_fname);
502 }
503 if (ret == -1) {
504 if (errno == ENOTDIR ||
505 errno == ENOENT ||
506 errno == ELOOP) {
507 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
508 goto fail;
509 }
510 }
511
512 /*
513 * Missing last component is ok - new file.
514 * Also deal with permission denied elsewhere.
515 * Just drop out to done.
516 */
517 goto done;
518 }
519 }
520 } else {
521 /*
522 * We have a wildcard in the pathname.
523 *
524 * Optimization for common case where the wildcard
525 * is in the last component and the client already
526 * sent the correct case.
527 */
528 status = check_parent_exists(ctx,
529 conn,
530 posix_pathnames,
531 smb_fname,
532 &dirpath,
533 &start);
534 if (!NT_STATUS_IS_OK(status)) {
535 goto fail;
536 }
537 }
538
539 /*
540 * is_mangled() was changed to look at an entire pathname, not
541 * just a component. JRA.
542 */
543
544 if (mangle_is_mangled(start, conn->params)) {
545 component_was_mangled = True;
546 }
547
548 /*
549 * Now we need to recursively match the name against the real
550 * directory structure.
551 */
552
553 /*
554 * Match each part of the path name separately, trying the names
555 * as is first, then trying to scan the directory for matching names.
556 */
557
558 for (; start ; start = (end?end+1:(char *)NULL)) {
559 /*
560 * Pinpoint the end of this section of the filename.
561 */
562 /* mb safe. '/' can't be in any encoded char. */
563 end = strchr(start, '/');
564
565 /*
566 * Chop the name at this point.
567 */
568 if (end) {
569 *end = 0;
570 }
571
572 if (save_last_component) {
573 TALLOC_FREE(smb_fname->original_lcomp);
574 smb_fname->original_lcomp = talloc_strdup(smb_fname,
575 end ? end + 1 : start);
576 if (!smb_fname->original_lcomp) {
577 DEBUG(0, ("talloc failed\n"));
578 status = NT_STATUS_NO_MEMORY;
579 goto err;
580 }
581 }
582
583 /* The name cannot have a component of "." */
584
585 if (ISDOT(start)) {
586 if (!end) {
587 /* Error code at the end of a pathname. */
588 status = NT_STATUS_OBJECT_NAME_INVALID;
589 } else {
590 status = determine_path_error(end+1,
591 allow_wcard_last_component);
592 }
593 goto fail;
594 }
595
596 /* The name cannot have a wildcard if it's not
597 the last component. */
598
599 name_has_wildcard = ms_has_wild(start);
600
601 /* Wildcards never valid within a pathname. */
602 if (name_has_wildcard && end) {
603 status = NT_STATUS_OBJECT_NAME_INVALID;
604 goto fail;
605 }
606
607 /* Skip the stat call if it's a wildcard end. */
608 if (name_has_wildcard) {
609 DEBUG(5,("Wildcard %s\n",start));
610 goto done;
611 }
612
613 /*
614 * Check if the name exists up to this point.
615 */
616
617 if (posix_pathnames) {
618 ret = SMB_VFS_LSTAT(conn, smb_fname);
619 } else {
620 ret = SMB_VFS_STAT(conn, smb_fname);
621 }
622
623 if (ret == 0) {
624 /*
625 * It exists. it must either be a directory or this must
626 * be the last part of the path for it to be OK.
627 */
628 if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
629 /*
630 * An intermediate part of the name isn't
631 * a directory.
632 */
633 DEBUG(5,("Not a dir %s\n",start));
634 *end = '/';
635 /*
636 * We need to return the fact that the
637 * intermediate name resolution failed. This
638 * is used to return an error of ERRbadpath
639 * rather than ERRbadfile. Some Windows
640 * applications depend on the difference between
641 * these two errors.
642 */
643 status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
644 goto fail;
645 }
646
647 } else {
648 char *found_name = NULL;
649
650 /* Stat failed - ensure we don't use it. */
651 SET_STAT_INVALID(smb_fname->st);
652
653 /*
654 * Reset errno so we can detect
655 * directory open errors.
656 */
657 errno = 0;
658
659 /*
660 * Try to find this part of the path in the directory.
661 */
662
663 if (name_has_wildcard ||
664 (get_real_filename(conn, dirpath, start,
665 talloc_tos(),
666 &found_name) == -1)) {
667 char *unmangled;
668
669 if (end) {
670 /*
671 * An intermediate part of the name
672 * can't be found.
673 */
674 DEBUG(5,("Intermediate not found %s\n",
675 start));
676 *end = '/';
677
678 /*
679 * We need to return the fact that the
680 * intermediate name resolution failed.
681 * This is used to return an error of
682 * ERRbadpath rather than ERRbadfile.
683 * Some Windows applications depend on
684 * the difference between these two
685 * errors.
686 */
687
688 /*
689 * ENOENT, ENOTDIR and ELOOP all map
690 * to NT_STATUS_OBJECT_PATH_NOT_FOUND
691 * in the filename walk.
692 */
693
694 if (errno == ENOENT ||
695 errno == ENOTDIR ||
696 errno == ELOOP) {
697 status =
698 NT_STATUS_OBJECT_PATH_NOT_FOUND;
699 }
700 else {
701 status =
702 map_nt_error_from_unix(errno);
703 }
704 goto fail;
705 }
706
707 /*
708 * ENOENT/EACCESS are the only valid errors
709 * here. EACCESS needs handling here for
710 * "dropboxes", i.e. directories where users
711 * can only put stuff with permission -wx.
712 */
713 if ((errno != 0) && (errno != ENOENT)
714 && (errno != EACCES)) {
715 /*
716 * ENOTDIR and ELOOP both map to
717 * NT_STATUS_OBJECT_PATH_NOT_FOUND
718 * in the filename walk.
719 */
720 if (errno == ENOTDIR ||
721 errno == ELOOP) {
722 status =
723 NT_STATUS_OBJECT_PATH_NOT_FOUND;
724 } else {
725 status =
726 map_nt_error_from_unix(errno);
727 }
728 goto fail;
729 }
730
731 /*
732 * Just the last part of the name doesn't exist.
733 * We need to strupper() or strlower() it as
734 * this conversion may be used for file creation
735 * purposes. Fix inspired by
736 * Thomas Neumann <t.neumann@iku-ag.de>.
737 */
738 if (!conn->case_preserve ||
739 (mangle_is_8_3(start, False,
740 conn->params) &&
741 !conn->short_case_preserve)) {
742 strnorm(start,
743 lp_defaultcase(SNUM(conn)));
744 }
745
746 /*
747 * check on the mangled stack to see if we can
748 * recover the base of the filename.
749 */
750
751 if (mangle_is_mangled(start, conn->params)
752 && mangle_lookup_name_from_8_3(ctx,
753 start,
754 &unmangled,
755 conn->params)) {
756 char *tmp;
757 size_t start_ofs =
758 start - smb_fname->base_name;
759
760 if (*dirpath != '\0') {
761 tmp = talloc_asprintf(
762 smb_fname, "%s/%s",
763 dirpath, unmangled);
764 TALLOC_FREE(unmangled);
765 }
766 else {
767 tmp = unmangled;
768 }
769 if (tmp == NULL) {
770 DEBUG(0, ("talloc failed\n"));
771 status = NT_STATUS_NO_MEMORY;
772 goto err;
773 }
774 TALLOC_FREE(smb_fname->base_name);
775 smb_fname->base_name = tmp;
776 start =
777 smb_fname->base_name + start_ofs;
778 end = start + strlen(start);
779 }
780
781 DEBUG(5,("New file %s\n",start));
782 goto done;
783 }
784
785
786 /*
787 * Restore the rest of the string. If the string was
788 * mangled the size may have changed.
789 */
790 if (end) {
791 char *tmp;
792 size_t start_ofs =
793 start - smb_fname->base_name;
794
795 if (*dirpath != '\0') {
796 tmp = talloc_asprintf(smb_fname,
797 "%s/%s/%s", dirpath,
798 found_name, end+1);
799 }
800 else {
801 tmp = talloc_asprintf(smb_fname,
802 "%s/%s", found_name,
803 end+1);
804 }
805 if (tmp == NULL) {
806 DEBUG(0, ("talloc_asprintf failed\n"));
807 status = NT_STATUS_NO_MEMORY;
808 goto err;
809 }
810 TALLOC_FREE(smb_fname->base_name);
811 smb_fname->base_name = tmp;
812 start = smb_fname->base_name + start_ofs;
813 end = start + strlen(found_name);
814 *end = '\0';
815 } else {
816 char *tmp;
817 size_t start_ofs =
818 start - smb_fname->base_name;
819
820 if (*dirpath != '\0') {
821 tmp = talloc_asprintf(smb_fname,
822 "%s/%s", dirpath,
823 found_name);
824 } else {
825 tmp = talloc_strdup(smb_fname,
826 found_name);
827 }
828 if (tmp == NULL) {
829 DEBUG(0, ("talloc failed\n"));
830 status = NT_STATUS_NO_MEMORY;
831 goto err;
832 }
833 TALLOC_FREE(smb_fname->base_name);
834 smb_fname->base_name = tmp;
835 start = smb_fname->base_name + start_ofs;
836
837 /*
838 * We just scanned for, and found the end of
839 * the path. We must return a valid stat struct
840 * if it exists. JRA.
841 */
842
843 if (posix_pathnames) {
844 ret = SMB_VFS_LSTAT(conn, smb_fname);
845 } else {
846 ret = SMB_VFS_STAT(conn, smb_fname);
847 }
848
849 if (ret != 0) {
850 SET_STAT_INVALID(smb_fname->st);
851 }
852 }
853
854 TALLOC_FREE(found_name);
855 } /* end else */
856
857 #ifdef DEVELOPER
858 /*
859 * This sucks!
860 * We should never provide different behaviors
861 * depending on DEVELOPER!!!
862 */
863 if (VALID_STAT(smb_fname->st)) {
864 bool delete_pending;
865 uint32_t name_hash;
866
867 status = file_name_hash(conn,
868 smb_fname_str_dbg(smb_fname),
869 &name_hash);
870 if (!NT_STATUS_IS_OK(status)) {
871 goto fail;
872 }
873
874 get_file_infos(vfs_file_id_from_sbuf(conn,
875 &smb_fname->st),
876 name_hash,
877 &delete_pending, NULL);
878 if (delete_pending) {
879 status = NT_STATUS_DELETE_PENDING;
880 goto fail;
881 }
882 }
883 #endif
884
885 /*
886 * Add to the dirpath that we have resolved so far.
887 */
888
889 if (*dirpath != '\0') {
890 char *tmp = talloc_asprintf(ctx,
891 "%s/%s", dirpath, start);
892 if (!tmp) {
893 DEBUG(0, ("talloc_asprintf failed\n"));
894 status = NT_STATUS_NO_MEMORY;
895 goto err;
896 }
897 TALLOC_FREE(dirpath);
898 dirpath = tmp;
899 }
900 else {
901 TALLOC_FREE(dirpath);
902 if (!(dirpath = talloc_strdup(ctx,start))) {
903 DEBUG(0, ("talloc_strdup failed\n"));
904 status = NT_STATUS_NO_MEMORY;
905 goto err;
906 }
907 }
908
909 /*
910 * Cache the dirpath thus far. Don't cache a name with mangled
911 * or wildcard components as this can change the size.
912 */
913 if(!component_was_mangled && !name_has_wildcard) {
914 stat_cache_add(orig_path, dirpath,
915 conn->case_sensitive);
916 }
917
918 /*
919 * Restore the / that we wiped out earlier.
920 */
921 if (end) {
922 *end = '/';
923 }
924 }
925
926 /*
927 * Cache the full path. Don't cache a name with mangled or wildcard
928 * components as this can change the size.
929 */
930
931 if(!component_was_mangled && !name_has_wildcard) {
932 stat_cache_add(orig_path, smb_fname->base_name,
933 conn->case_sensitive);
934 }
935
936 /*
937 * The name has been resolved.
938 */
939
940 DEBUG(5,("conversion finished %s -> %s\n", orig_path,
941 smb_fname->base_name));
942
943 done:
944 /* Add back the stream if one was stripped off originally. */
945 if (stream != NULL) {
946 smb_fname->stream_name = stream;
947
948 /* Check path now that the base_name has been converted. */
949 status = build_stream_path(ctx, conn, orig_path, smb_fname);
950 if (!NT_STATUS_IS_OK(status)) {
951 goto fail;
952 }
953 }
954 TALLOC_FREE(dirpath);
955 *smb_fname_out = smb_fname;
956 return NT_STATUS_OK;
957 fail:
958 DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
959 if (*dirpath != '\0') {
960 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
961 dirpath, start);
962 } else {
963 smb_fname->base_name = talloc_strdup(smb_fname, start);
964 }
965 if (!smb_fname->base_name) {
966 DEBUG(0, ("talloc_asprintf failed\n"));
967 status = NT_STATUS_NO_MEMORY;
968 goto err;
969 }
970
971 *smb_fname_out = smb_fname;
972 TALLOC_FREE(dirpath);
973 return status;
974 err:
975 TALLOC_FREE(smb_fname);
976 return status;
977 }
978
979 /****************************************************************************
980 Check a filename - possibly calling check_reduced_name.
981 This is called by every routine before it allows an operation on a filename.
982 It does any final confirmation necessary to ensure that the filename is
983 a valid one for the user to access.
984 ****************************************************************************/
985
986 NTSTATUS check_name(connection_struct *conn, const char *name)
987 {
988 if (IS_VETO_PATH(conn, name)) {
989 /* Is it not dot or dot dot. */
990 if (!((name[0] == '.') && (!name[1] ||
991 (name[1] == '.' && !name[2])))) {
992 DEBUG(5,("check_name: file path name %s vetoed\n",
993 name));
994 return map_nt_error_from_unix(ENOENT);
995 }
996 }
997
998 if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
999 NTSTATUS status = check_reduced_name(conn,name);
1000 if (!NT_STATUS_IS_OK(status)) {
1001 DEBUG(5,("check_name: name %s failed with %s\n",name,
1002 nt_errstr(status)));
1003 return status;
1004 }
1005 }
1006
1007 return NT_STATUS_OK;
1008 }
1009
1010 /****************************************************************************
1011 Check if two filenames are equal.
1012 This needs to be careful about whether we are case sensitive.
1013 ****************************************************************************/
1014
1015 static bool fname_equal(const char *name1, const char *name2,
1016 bool case_sensitive)
1017 {
1018 /* Normal filename handling */
1019 if (case_sensitive) {
1020 return(strcmp(name1,name2) == 0);
1021 }
1022
1023 return(strequal(name1,name2));
1024 }
1025
1026 /****************************************************************************
1027 Scan a directory to find a filename, matching without case sensitivity.
1028 If the name looks like a mangled name then try via the mangling functions
1029 ****************************************************************************/
1030
1031 static int get_real_filename_full_scan(connection_struct *conn,
1032 const char *path, const char *name,
1033 bool mangled,
1034 TALLOC_CTX *mem_ctx, char **found_name)
1035 {
1036 struct smb_Dir *cur_dir;
1037 const char *dname = NULL;
1038 char *talloced = NULL;
1039 char *unmangled_name = NULL;
1040 long curpos;
1041
1042 /* handle null paths */
1043 if ((path == NULL) || (*path == 0)) {
1044 path = ".";
1045 }
1046
1047 /* If we have a case-sensitive filesystem, it doesn't do us any
1048 * good to search for a name. If a case variation of the name was
1049 * there, then the original stat(2) would have found it.
1050 */
1051 if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1052 errno = ENOENT;
1053 return -1;
1054 }
1055
1056 /*
1057 * The incoming name can be mangled, and if we de-mangle it
1058 * here it will not compare correctly against the filename (name2)
1059 * read from the directory and then mangled by the name_to_8_3()
1060 * call. We need to mangle both names or neither.
1061 * (JRA).
1062 *
1063 * Fix for bug found by Dina Fine. If in case sensitive mode then
1064 * the mangle cache is no good (3 letter extension could be wrong
1065 * case - so don't demangle in this case - leave as mangled and
1066 * allow the mangling of the directory entry read (which is done
1067 * case insensitively) to match instead. This will lead to more
1068 * false positive matches but we fail completely without it. JRA.
1069 */
1070
1071 if (mangled && !conn->case_sensitive) {
1072 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1073 &unmangled_name,
1074 conn->params);
1075 if (!mangled) {
1076 /* Name is now unmangled. */
1077 name = unmangled_name;
1078 }
1079 }
1080
1081 /* open the directory */
1082 if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1083 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1084 TALLOC_FREE(unmangled_name);
1085 return -1;
1086 }
1087
1088 /* now scan for matching names */
1089 curpos = 0;
1090 while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1091
1092 /* Is it dot or dot dot. */
1093 if (ISDOT(dname) || ISDOTDOT(dname)) {
1094 TALLOC_FREE(talloced);
1095 continue;
1096 }
1097
1098 /*
1099 * At this point dname is the unmangled name.
1100 * name is either mangled or not, depending on the state
1101 * of the "mangled" variable. JRA.
1102 */
1103
1104 /*
1105 * Check mangled name against mangled name, or unmangled name
1106 * against unmangled name.
1107 */
1108
1109 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1110 fname_equal(name, dname, conn->case_sensitive)) {
1111 /* we've found the file, change it's name and return */
1112 *found_name = talloc_strdup(mem_ctx, dname);
1113 TALLOC_FREE(unmangled_name);
1114 TALLOC_FREE(cur_dir);
1115 if (!*found_name) {
1116 errno = ENOMEM;
1117 TALLOC_FREE(talloced);
1118 return -1;
1119 }
1120 TALLOC_FREE(talloced);
1121 return 0;
1122 }
1123 TALLOC_FREE(talloced);
1124 }
1125
1126 TALLOC_FREE(unmangled_name);
1127 TALLOC_FREE(cur_dir);
1128 errno = ENOENT;
1129 return -1;
1130 }
1131
1132 /****************************************************************************
1133 Wrapper around the vfs get_real_filename and the full directory scan
1134 fallback.
1135 ****************************************************************************/
1136
1137 int get_real_filename(connection_struct *conn, const char *path,
1138 const char *name, TALLOC_CTX *mem_ctx,
1139 char **found_name)
1140 {
1141 int ret;
1142 bool mangled;
1143
1144 mangled = mangle_is_mangled(name, conn->params);
1145
1146 if (mangled) {
1147 return get_real_filename_full_scan(conn, path, name, mangled,
1148 mem_ctx, found_name);
1149 }
1150
1151 /* Try the vfs first to take advantage of case-insensitive stat. */
1152 ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1153
1154 /*
1155 * If the case-insensitive stat was successful, or returned an error
1156 * other than EOPNOTSUPP then there is no need to fall back on the
1157 * full directory scan.
1158 */
1159 if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1160 return ret;
1161 }
1162
1163 return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1164 found_name);
1165 }
1166
1167 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1168 connection_struct *conn,
1169 const char *orig_path,
1170 struct smb_filename *smb_fname)
1171 {
1172 NTSTATUS status;
1173 unsigned int i, num_streams = 0;
1174 struct stream_struct *streams = NULL;
1175
1176 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1177 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1178 return NT_STATUS_OK;
1179 }
1180
1181 if (errno != ENOENT) {
1182 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1183 status = map_nt_error_from_unix(errno);
1184 goto fail;
1185 }
1186
1187 /* Fall back to a case-insensitive scan of all streams on the file. */
1188 status = SMB_VFS_STREAMINFO(conn, NULL, smb_fname->base_name, mem_ctx,
1189 &num_streams, &streams);
1190
1191 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1192 SET_STAT_INVALID(smb_fname->st);
1193 return NT_STATUS_OK;
1194 }
1195
1196 if (!NT_STATUS_IS_OK(status)) {
1197 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1198 goto fail;
1199 }
1200
1201 for (i=0; i<num_streams; i++) {
1202 DEBUG(10, ("comparing [%s] and [%s]: ",
1203 smb_fname->stream_name, streams[i].name));
1204 if (fname_equal(smb_fname->stream_name, streams[i].name,
1205 conn->case_sensitive)) {
1206 DEBUGADD(10, ("equal\n"));
1207 break;
1208 }
1209 DEBUGADD(10, ("not equal\n"));
1210 }
1211
1212 /* Couldn't find the stream. */
1213 if (i == num_streams) {
1214 SET_STAT_INVALID(smb_fname->st);
1215 TALLOC_FREE(streams);
1216 return NT_STATUS_OK;
1217 }
1218
1219 DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1220 smb_fname->stream_name, streams[i].name));
1221
1222
1223 TALLOC_FREE(smb_fname->stream_name);
1224 smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1225 if (smb_fname->stream_name == NULL) {
1226 status = NT_STATUS_NO_MEMORY;
1227 goto fail;
1228 }
1229
1230 SET_STAT_INVALID(smb_fname->st);
1231
1232 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1233 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1234 }
1235 status = NT_STATUS_OK;
1236 fail:
1237 TALLOC_FREE(streams);
1238 return status;
1239 }
1240
1241 /**
1242 * Go through all the steps to validate a filename.
1243 *
1244 * @param ctx talloc_ctx to allocate memory with.
1245 * @param conn connection struct for vfs calls.
1246 * @param dfs_path Whether this path requires dfs resolution.
1247 * @param name_in The unconverted name.
1248 * @param ucf_flags flags to pass through to unix_convert().
1249 * UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1250 * p_cont_wcard != NULL and is true and
1251 * UCF_COND_ALLOW_WCARD_LCOMP.
1252 * @param p_cont_wcard If not NULL, will be set to true if the dfs path
1253 * resolution detects a wildcard.
1254 * @param pp_smb_fname The final converted name will be allocated if the
1255 * return is NT_STATUS_OK.
1256 *
1257 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1258 * error otherwise.
1259 */
1260 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1261 connection_struct *conn,
1262 bool dfs_path,
1263 const char *name_in,
1264 uint32_t ucf_flags,
1265 bool *ppath_contains_wcard,
1266 struct smb_filename **pp_smb_fname)
1267 {
1268 NTSTATUS status;
1269 bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1270 char *fname = NULL;
1271
1272 *pp_smb_fname = NULL;
1273
1274 status = resolve_dfspath_wcard(ctx, conn,
1275 dfs_path,
1276 name_in,
1277 allow_wcards,
1278 &fname,
1279 ppath_contains_wcard);
1280 if (!NT_STATUS_IS_OK(status)) {
1281 DEBUG(10,("filename_convert: resolve_dfspath failed "
1282 "for name %s with %s\n",
1283 name_in,
1284 nt_errstr(status) ));
1285 return status;
1286 }
1287
1288 if (is_fake_file_path(name_in)) {
1289 SMB_STRUCT_STAT st;
1290 ZERO_STRUCT(st);
1291 st.st_ex_nlink = 1;
1292 status = create_synthetic_smb_fname_split(ctx,
1293 name_in,
1294 &st,
1295 pp_smb_fname);
1296 return status;
1297 }
1298
1299 /*
1300 * If the caller conditionally allows wildcard lookups, only add the
1301 * always allow if the path actually does contain a wildcard.
1302 */
1303 if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1304 ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1305 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1306 }
1307
1308 status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1309 if (!NT_STATUS_IS_OK(status)) {
1310 DEBUG(10,("filename_convert: unix_convert failed "
1311 "for name %s with %s\n",
1312 fname,
1313 nt_errstr(status) ));
1314 return status;
1315 }
1316
1317 status = check_name(conn, (*pp_smb_fname)->base_name);
1318 if (!NT_STATUS_IS_OK(status)) {
1319 DEBUG(3,("filename_convert: check_name failed "
1320 "for name %s with %s\n",
1321 smb_fname_str_dbg(*pp_smb_fname),
1322 nt_errstr(status) ));
1323 TALLOC_FREE(*pp_smb_fname);
1324 return status;
1325 }
1326
1327 return status;
1328 }
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