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librpc: Shorten dcerpc_binding_handle_call a bit
[Samba/bjacke.git] / source3 / smbd / filename.c
blob03e1d2dfa1e62e75a05ebb30327a8df113f4ce6a
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. EACCESS needs handling here for
722 * "dropboxes", i.e. directories where users
723 * can only put stuff with permission -wx.
724 */
725 if ((errno != 0) && (errno != ENOENT)
726 && (errno != EACCES)) {
727 /*
728 * ENOTDIR and ELOOP both map to
729 * NT_STATUS_OBJECT_PATH_NOT_FOUND
730 * in the filename walk.
731 */
732 if (errno == ENOTDIR ||
733 errno == ELOOP) {
734 status =
735 NT_STATUS_OBJECT_PATH_NOT_FOUND;
736 } else {
737 status =
738 map_nt_error_from_unix(errno);
739 }
740 goto fail;
741 }
742
743 /*
744 * Just the last part of the name doesn't exist.
745 * We need to strupper() or strlower() it as
746 * this conversion may be used for file creation
747 * purposes. Fix inspired by
748 * Thomas Neumann <t.neumann@iku-ag.de>.
749 */
750 if (!conn->case_preserve ||
751 (mangle_is_8_3(start, False,
752 conn->params) &&
753 !conn->short_case_preserve)) {
754 if (!strnorm(start,
755 lp_defaultcase(SNUM(conn)))) {
756 DEBUG(0, ("strnorm %s failed\n",
757 start));
758 status = NT_STATUS_INVALID_PARAMETER;
759 goto err;
760 }
761 }
762
763 /*
764 * check on the mangled stack to see if we can
765 * recover the base of the filename.
766 */
767
768 if (mangle_is_mangled(start, conn->params)
769 && mangle_lookup_name_from_8_3(ctx,
770 start,
771 &unmangled,
772 conn->params)) {
773 char *tmp;
774 size_t start_ofs =
775 start - smb_fname->base_name;
776
777 if (*dirpath != '\0') {
778 tmp = talloc_asprintf(
779 smb_fname, "%s/%s",
780 dirpath, unmangled);
781 TALLOC_FREE(unmangled);
782 }
783 else {
784 tmp = unmangled;
785 }
786 if (tmp == NULL) {
787 DEBUG(0, ("talloc failed\n"));
788 status = NT_STATUS_NO_MEMORY;
789 goto err;
790 }
791 TALLOC_FREE(smb_fname->base_name);
792 smb_fname->base_name = tmp;
793 start =
794 smb_fname->base_name + start_ofs;
795 end = start + strlen(start);
796 }
797
798 DEBUG(5,("New file %s\n",start));
799 goto done;
800 }
801
802
803 /*
804 * Restore the rest of the string. If the string was
805 * mangled the size may have changed.
806 */
807 if (end) {
808 char *tmp;
809 size_t start_ofs =
810 start - smb_fname->base_name;
811
812 if (*dirpath != '\0') {
813 tmp = talloc_asprintf(smb_fname,
814 "%s/%s/%s", dirpath,
815 found_name, end+1);
816 }
817 else {
818 tmp = talloc_asprintf(smb_fname,
819 "%s/%s", found_name,
820 end+1);
821 }
822 if (tmp == NULL) {
823 DEBUG(0, ("talloc_asprintf failed\n"));
824 status = NT_STATUS_NO_MEMORY;
825 goto err;
826 }
827 TALLOC_FREE(smb_fname->base_name);
828 smb_fname->base_name = tmp;
829 start = smb_fname->base_name + start_ofs;
830 end = start + strlen(found_name);
831 *end = '\0';
832 } else {
833 char *tmp;
834 size_t start_ofs =
835 start - smb_fname->base_name;
836
837 if (*dirpath != '\0') {
838 tmp = talloc_asprintf(smb_fname,
839 "%s/%s", dirpath,
840 found_name);
841 } else {
842 tmp = talloc_strdup(smb_fname,
843 found_name);
844 }
845 if (tmp == NULL) {
846 DEBUG(0, ("talloc failed\n"));
847 status = NT_STATUS_NO_MEMORY;
848 goto err;
849 }
850 TALLOC_FREE(smb_fname->base_name);
851 smb_fname->base_name = tmp;
852 start = smb_fname->base_name + start_ofs;
853
854 /*
855 * We just scanned for, and found the end of
856 * the path. We must return a valid stat struct
857 * if it exists. JRA.
858 */
859
860 if (posix_pathnames) {
861 ret = SMB_VFS_LSTAT(conn, smb_fname);
862 } else {
863 ret = SMB_VFS_STAT(conn, smb_fname);
864 }
865
866 if (ret != 0) {
867 SET_STAT_INVALID(smb_fname->st);
868 }
869 }
870
871 TALLOC_FREE(found_name);
872 } /* end else */
873
874 #ifdef DEVELOPER
875 /*
876 * This sucks!
877 * We should never provide different behaviors
878 * depending on DEVELOPER!!!
879 */
880 if (VALID_STAT(smb_fname->st)) {
881 bool delete_pending;
882 uint32_t name_hash;
883
884 status = file_name_hash(conn,
885 smb_fname_str_dbg(smb_fname),
886 &name_hash);
887 if (!NT_STATUS_IS_OK(status)) {
888 goto fail;
889 }
890
891 get_file_infos(vfs_file_id_from_sbuf(conn,
892 &smb_fname->st),
893 name_hash,
894 &delete_pending, NULL);
895 if (delete_pending) {
896 status = NT_STATUS_DELETE_PENDING;
897 goto fail;
898 }
899 }
900 #endif
901
902 /*
903 * Add to the dirpath that we have resolved so far.
904 */
905
906 if (*dirpath != '\0') {
907 char *tmp = talloc_asprintf(ctx,
908 "%s/%s", dirpath, start);
909 if (!tmp) {
910 DEBUG(0, ("talloc_asprintf failed\n"));
911 status = NT_STATUS_NO_MEMORY;
912 goto err;
913 }
914 TALLOC_FREE(dirpath);
915 dirpath = tmp;
916 }
917 else {
918 TALLOC_FREE(dirpath);
919 if (!(dirpath = talloc_strdup(ctx,start))) {
920 DEBUG(0, ("talloc_strdup failed\n"));
921 status = NT_STATUS_NO_MEMORY;
922 goto err;
923 }
924 }
925
926 /*
927 * Cache the dirpath thus far. Don't cache a name with mangled
928 * or wildcard components as this can change the size.
929 */
930 if(!component_was_mangled && !name_has_wildcard) {
931 stat_cache_add(orig_path, dirpath,
932 conn->case_sensitive);
933 }
934
935 /*
936 * Restore the / that we wiped out earlier.
937 */
938 if (end) {
939 *end = '/';
940 }
941 }
942
943 /*
944 * Cache the full path. Don't cache a name with mangled or wildcard
945 * components as this can change the size.
946 */
947
948 if(!component_was_mangled && !name_has_wildcard) {
949 stat_cache_add(orig_path, smb_fname->base_name,
950 conn->case_sensitive);
951 }
952
953 /*
954 * The name has been resolved.
955 */
956
957 DEBUG(5,("conversion finished %s -> %s\n", orig_path,
958 smb_fname->base_name));
959
960 done:
961 /* Add back the stream if one was stripped off originally. */
962 if (stream != NULL) {
963 smb_fname->stream_name = stream;
964
965 /* Check path now that the base_name has been converted. */
966 status = build_stream_path(ctx, conn, orig_path, smb_fname);
967 if (!NT_STATUS_IS_OK(status)) {
968 goto fail;
969 }
970 }
971 TALLOC_FREE(dirpath);
972 *smb_fname_out = smb_fname;
973 return NT_STATUS_OK;
974 fail:
975 DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
976 if (*dirpath != '\0') {
977 smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
978 dirpath, start);
979 } else {
980 smb_fname->base_name = talloc_strdup(smb_fname, start);
981 }
982 if (!smb_fname->base_name) {
983 DEBUG(0, ("talloc_asprintf failed\n"));
984 status = NT_STATUS_NO_MEMORY;
985 goto err;
986 }
987
988 *smb_fname_out = smb_fname;
989 TALLOC_FREE(dirpath);
990 return status;
991 err:
992 TALLOC_FREE(smb_fname);
993 return status;
994 }
995
996 /****************************************************************************
997 Ensure a path is not vetod.
998 ****************************************************************************/
999
1000 NTSTATUS check_veto_path(connection_struct *conn, const char *name)
1001 {
1002 if (IS_VETO_PATH(conn, name)) {
1003 /* Is it not dot or dot dot. */
1004 if (!(ISDOT(name) || ISDOTDOT(name))) {
1005 DEBUG(5,("check_veto_path: file path name %s vetoed\n",
1006 name));
1007 return map_nt_error_from_unix(ENOENT);
1008 }
1009 }
1010 return NT_STATUS_OK;
1011 }
1012
1013 /****************************************************************************
1014 Check a filename - possibly calling check_reduced_name.
1015 This is called by every routine before it allows an operation on a filename.
1016 It does any final confirmation necessary to ensure that the filename is
1017 a valid one for the user to access.
1018 ****************************************************************************/
1019
1020 NTSTATUS check_name(connection_struct *conn, const char *name)
1021 {
1022 NTSTATUS status = check_veto_path(conn, name);
1023
1024 if (!NT_STATUS_IS_OK(status)) {
1025 return status;
1026 }
1027
1028 if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
1029 status = check_reduced_name(conn,name);
1030 if (!NT_STATUS_IS_OK(status)) {
1031 DEBUG(5,("check_name: name %s failed with %s\n",name,
1032 nt_errstr(status)));
1033 return status;
1034 }
1035 }
1036
1037 return NT_STATUS_OK;
1038 }
1039
1040 /****************************************************************************
1041 Must be called as root. Creates the struct privilege_paths
1042 attached to the struct smb_request if this call is successful.
1043 ****************************************************************************/
1044
1045 static NTSTATUS check_name_with_privilege(connection_struct *conn,
1046 struct smb_request *smbreq,
1047 const char *name)
1048 {
1049 NTSTATUS status = check_veto_path(conn, name);
1050
1051 if (!NT_STATUS_IS_OK(status)) {
1052 return status;
1053 }
1054 return check_reduced_name_with_privilege(conn,
1055 name,
1056 smbreq);
1057 }
1058
1059 /****************************************************************************
1060 Check if two filenames are equal.
1061 This needs to be careful about whether we are case sensitive.
1062 ****************************************************************************/
1063
1064 static bool fname_equal(const char *name1, const char *name2,
1065 bool case_sensitive)
1066 {
1067 /* Normal filename handling */
1068 if (case_sensitive) {
1069 return(strcmp(name1,name2) == 0);
1070 }
1071
1072 return(strequal(name1,name2));
1073 }
1074
1075 /****************************************************************************
1076 Scan a directory to find a filename, matching without case sensitivity.
1077 If the name looks like a mangled name then try via the mangling functions
1078 ****************************************************************************/
1079
1080 static int get_real_filename_full_scan(connection_struct *conn,
1081 const char *path, const char *name,
1082 bool mangled,
1083 TALLOC_CTX *mem_ctx, char **found_name)
1084 {
1085 struct smb_Dir *cur_dir;
1086 const char *dname = NULL;
1087 char *talloced = NULL;
1088 char *unmangled_name = NULL;
1089 long curpos;
1090
1091 /* handle null paths */
1092 if ((path == NULL) || (*path == 0)) {
1093 path = ".";
1094 }
1095
1096 /* If we have a case-sensitive filesystem, it doesn't do us any
1097 * good to search for a name. If a case variation of the name was
1098 * there, then the original stat(2) would have found it.
1099 */
1100 if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
1101 errno = ENOENT;
1102 return -1;
1103 }
1104
1105 /*
1106 * The incoming name can be mangled, and if we de-mangle it
1107 * here it will not compare correctly against the filename (name2)
1108 * read from the directory and then mangled by the name_to_8_3()
1109 * call. We need to mangle both names or neither.
1110 * (JRA).
1111 *
1112 * Fix for bug found by Dina Fine. If in case sensitive mode then
1113 * the mangle cache is no good (3 letter extension could be wrong
1114 * case - so don't demangle in this case - leave as mangled and
1115 * allow the mangling of the directory entry read (which is done
1116 * case insensitively) to match instead. This will lead to more
1117 * false positive matches but we fail completely without it. JRA.
1118 */
1119
1120 if (mangled && !conn->case_sensitive) {
1121 mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
1122 &unmangled_name,
1123 conn->params);
1124 if (!mangled) {
1125 /* Name is now unmangled. */
1126 name = unmangled_name;
1127 }
1128 }
1129
1130 /* open the directory */
1131 if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
1132 DEBUG(3,("scan dir didn't open dir [%s]\n",path));
1133 TALLOC_FREE(unmangled_name);
1134 return -1;
1135 }
1136
1137 /* now scan for matching names */
1138 curpos = 0;
1139 while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {
1140
1141 /* Is it dot or dot dot. */
1142 if (ISDOT(dname) || ISDOTDOT(dname)) {
1143 TALLOC_FREE(talloced);
1144 continue;
1145 }
1146
1147 /*
1148 * At this point dname is the unmangled name.
1149 * name is either mangled or not, depending on the state
1150 * of the "mangled" variable. JRA.
1151 */
1152
1153 /*
1154 * Check mangled name against mangled name, or unmangled name
1155 * against unmangled name.
1156 */
1157
1158 if ((mangled && mangled_equal(name,dname,conn->params)) ||
1159 fname_equal(name, dname, conn->case_sensitive)) {
1160 /* we've found the file, change it's name and return */
1161 *found_name = talloc_strdup(mem_ctx, dname);
1162 TALLOC_FREE(unmangled_name);
1163 TALLOC_FREE(cur_dir);
1164 if (!*found_name) {
1165 errno = ENOMEM;
1166 TALLOC_FREE(talloced);
1167 return -1;
1168 }
1169 TALLOC_FREE(talloced);
1170 return 0;
1171 }
1172 TALLOC_FREE(talloced);
1173 }
1174
1175 TALLOC_FREE(unmangled_name);
1176 TALLOC_FREE(cur_dir);
1177 errno = ENOENT;
1178 return -1;
1179 }
1180
1181 /****************************************************************************
1182 Wrapper around the vfs get_real_filename and the full directory scan
1183 fallback.
1184 ****************************************************************************/
1185
1186 int get_real_filename(connection_struct *conn, const char *path,
1187 const char *name, TALLOC_CTX *mem_ctx,
1188 char **found_name)
1189 {
1190 int ret;
1191 bool mangled;
1192
1193 mangled = mangle_is_mangled(name, conn->params);
1194
1195 if (mangled) {
1196 return get_real_filename_full_scan(conn, path, name, mangled,
1197 mem_ctx, found_name);
1198 }
1199
1200 /* Try the vfs first to take advantage of case-insensitive stat. */
1201 ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);
1202
1203 /*
1204 * If the case-insensitive stat was successful, or returned an error
1205 * other than EOPNOTSUPP then there is no need to fall back on the
1206 * full directory scan.
1207 */
1208 if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
1209 return ret;
1210 }
1211
1212 return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
1213 found_name);
1214 }
1215
1216 static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
1217 connection_struct *conn,
1218 const char *orig_path,
1219 struct smb_filename *smb_fname)
1220 {
1221 NTSTATUS status;
1222 unsigned int i, num_streams = 0;
1223 struct stream_struct *streams = NULL;
1224
1225 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1226 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1227 return NT_STATUS_OK;
1228 }
1229
1230 if (errno != ENOENT) {
1231 DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
1232 status = map_nt_error_from_unix(errno);
1233 goto fail;
1234 }
1235
1236 /* Fall back to a case-insensitive scan of all streams on the file. */
1237 status = vfs_streaminfo(conn, NULL, smb_fname->base_name, mem_ctx,
1238 &num_streams, &streams);
1239
1240 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1241 SET_STAT_INVALID(smb_fname->st);
1242 return NT_STATUS_OK;
1243 }
1244
1245 if (!NT_STATUS_IS_OK(status)) {
1246 DEBUG(10, ("vfs_streaminfo failed: %s\n", nt_errstr(status)));
1247 goto fail;
1248 }
1249
1250 for (i=0; i<num_streams; i++) {
1251 DEBUG(10, ("comparing [%s] and [%s]: ",
1252 smb_fname->stream_name, streams[i].name));
1253 if (fname_equal(smb_fname->stream_name, streams[i].name,
1254 conn->case_sensitive)) {
1255 DEBUGADD(10, ("equal\n"));
1256 break;
1257 }
1258 DEBUGADD(10, ("not equal\n"));
1259 }
1260
1261 /* Couldn't find the stream. */
1262 if (i == num_streams) {
1263 SET_STAT_INVALID(smb_fname->st);
1264 TALLOC_FREE(streams);
1265 return NT_STATUS_OK;
1266 }
1267
1268 DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
1269 smb_fname->stream_name, streams[i].name));
1270
1271
1272 TALLOC_FREE(smb_fname->stream_name);
1273 smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
1274 if (smb_fname->stream_name == NULL) {
1275 status = NT_STATUS_NO_MEMORY;
1276 goto fail;
1277 }
1278
1279 SET_STAT_INVALID(smb_fname->st);
1280
1281 if (SMB_VFS_STAT(conn, smb_fname) == 0) {
1282 DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
1283 }
1284 status = NT_STATUS_OK;
1285 fail:
1286 TALLOC_FREE(streams);
1287 return status;
1288 }
1289
1290 /**
1291 * Go through all the steps to validate a filename.
1292 *
1293 * @param ctx talloc_ctx to allocate memory with.
1294 * @param conn connection struct for vfs calls.
1295 * @param dfs_path Whether this path requires dfs resolution.
1296 * @param smbreq SMB request if we're using privileges.
1297 * @param name_in The unconverted name.
1298 * @param ucf_flags flags to pass through to unix_convert().
1299 * UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
1300 * p_cont_wcard != NULL and is true and
1301 * UCF_COND_ALLOW_WCARD_LCOMP.
1302 * @param p_cont_wcard If not NULL, will be set to true if the dfs path
1303 * resolution detects a wildcard.
1304 * @param pp_smb_fname The final converted name will be allocated if the
1305 * return is NT_STATUS_OK.
1306 *
1307 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
1308 * error otherwise.
1309 */
1310 static NTSTATUS filename_convert_internal(TALLOC_CTX *ctx,
1311 connection_struct *conn,
1312 bool dfs_path,
1313 struct smb_request *smbreq,
1314 const char *name_in,
1315 uint32_t ucf_flags,
1316 bool *ppath_contains_wcard,
1317 struct smb_filename **pp_smb_fname)
1318 {
1319 NTSTATUS status;
1320 bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
1321 char *fname = NULL;
1322
1323 *pp_smb_fname = NULL;
1324
1325 status = resolve_dfspath_wcard(ctx, conn,
1326 dfs_path,
1327 name_in,
1328 allow_wcards,
1329 !conn->sconn->using_smb2,
1330 &fname,
1331 ppath_contains_wcard);
1332 if (!NT_STATUS_IS_OK(status)) {
1333 DEBUG(10,("filename_convert_internal: resolve_dfspath failed "
1334 "for name %s with %s\n",
1335 name_in,
1336 nt_errstr(status) ));
1337 return status;
1338 }
1339
1340 if (is_fake_file_path(name_in)) {
1341 SMB_STRUCT_STAT st;
1342 ZERO_STRUCT(st);
1343 st.st_ex_nlink = 1;
1344 *pp_smb_fname = synthetic_smb_fname_split(ctx,
1345 name_in,
1346 &st);
1347 if (*pp_smb_fname == NULL) {
1348 return NT_STATUS_NO_MEMORY;
1349 }
1350 return NT_STATUS_OK;
1351 }
1352
1353 /*
1354 * If the caller conditionally allows wildcard lookups, only add the
1355 * always allow if the path actually does contain a wildcard.
1356 */
1357 if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
1358 ppath_contains_wcard != NULL && *ppath_contains_wcard) {
1359 ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
1360 }
1361
1362 status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
1363 if (!NT_STATUS_IS_OK(status)) {
1364 DEBUG(10,("filename_convert_internal: unix_convert failed "
1365 "for name %s with %s\n",
1366 fname,
1367 nt_errstr(status) ));
1368 return status;
1369 }
1370
1371 if ((ucf_flags & UCF_UNIX_NAME_LOOKUP) &&
1372 VALID_STAT((*pp_smb_fname)->st) &&
1373 S_ISLNK((*pp_smb_fname)->st.st_ex_mode)) {
1374 return check_veto_path(conn, (*pp_smb_fname)->base_name);
1375 }
1376
1377 if (!smbreq) {
1378 status = check_name(conn, (*pp_smb_fname)->base_name);
1379 } else {
1380 status = check_name_with_privilege(conn, smbreq, (*pp_smb_fname)->base_name);
1381 }
1382 if (!NT_STATUS_IS_OK(status)) {
1383 DEBUG(3,("filename_convert_internal: check_name failed "
1384 "for name %s with %s\n",
1385 smb_fname_str_dbg(*pp_smb_fname),
1386 nt_errstr(status) ));
1387 TALLOC_FREE(*pp_smb_fname);
1388 return status;
1389 }
1390
1391 return status;
1392 }
1393
1394 /*
1395 * Go through all the steps to validate a filename.
1396 * Non-root version.
1397 */
1398
1399 NTSTATUS filename_convert(TALLOC_CTX *ctx,
1400 connection_struct *conn,
1401 bool dfs_path,
1402 const char *name_in,
1403 uint32_t ucf_flags,
1404 bool *ppath_contains_wcard,
1405 struct smb_filename **pp_smb_fname)
1406 {
1407 return filename_convert_internal(ctx,
1408 conn,
1409 dfs_path,
1410 NULL,
1411 name_in,
1412 ucf_flags,
1413 ppath_contains_wcard,
1414 pp_smb_fname);
1415 }
1416
1417 /*
1418 * Go through all the steps to validate a filename.
1419 * root (privileged) version.
1420 */
1421
1422 NTSTATUS filename_convert_with_privilege(TALLOC_CTX *ctx,
1423 connection_struct *conn,
1424 struct smb_request *smbreq,
1425 const char *name_in,
1426 uint32_t ucf_flags,
1427 bool *ppath_contains_wcard,
1428 struct smb_filename **pp_smb_fname)
1429 {
1430 return filename_convert_internal(ctx,
1431 conn,
1432 smbreq->flags2 & FLAGS2_DFS_PATHNAMES,
1433 smbreq,
1434 name_in,
1435 ucf_flags,
1436 ppath_contains_wcard,
1437 pp_smb_fname);
1438 }
stuff from bjacke