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source: vendor/3.6.0/source3/smbd/filename.c

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Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago
Samba Server: update vendor to 3.6.0
File size: 35.6 KB

Line
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;
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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