summaryrefslogtreecommitdiff
path: root/source3/smbd/filename.c
blob: c26eba2ded2755a19c3000e5b7dea7f7a03f50ab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
/* 
   Unix SMB/CIFS implementation.
   filename handling routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 1999-2004
   Copyright (C) Ying Chen 2000
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
 * New hash table stat cache code added by Ying Chen.
 */

#include "includes.h"

static BOOL scan_directory(connection_struct *conn, const char *path, char *name,size_t maxlength);

/****************************************************************************
 Check if two filenames are equal.
 This needs to be careful about whether we are case sensitive.
****************************************************************************/

static BOOL fname_equal(const char *name1, const char *name2, BOOL case_sensitive)
{
	/* Normal filename handling */
	if (case_sensitive)
		return(strcmp(name1,name2) == 0);

	return(strequal(name1,name2));
}

/****************************************************************************
 Mangle the 2nd name and check if it is then equal to the first name.
****************************************************************************/

static BOOL mangled_equal(const char *name1, const char *name2,
			  const struct share_params *p)
{
	pstring tmpname;
	
	pstrcpy(tmpname, name2);
	mangle_map(tmpname, True, False, p);
	return strequal(name1, tmpname);
}

/****************************************************************************
 Cope with the differing wildcard and non-wildcard error cases.
****************************************************************************/

static NTSTATUS determine_path_error(const char *name, BOOL allow_wcard_last_component)
{
	const char *p;

	if (!allow_wcard_last_component) {
		/* Error code within a pathname. */
		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
	}

	/* We're terminating here so we
	 * can be a little slower and get
	 * the error code right. Windows
	 * treats the last part of the pathname
	 * separately I think, so if the last
	 * component is a wildcard then we treat
	 * this ./ as "end of component" */

	p = strchr(name, '/');

	if (!p && (ms_has_wild(name) || ISDOT(name))) {
		/* Error code at the end of a pathname. */
		return NT_STATUS_OBJECT_NAME_INVALID;
	} else {
		/* Error code within a pathname. */
		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
	}
}
	
/****************************************************************************
This routine is called to convert names from the dos namespace to unix
namespace. It needs to handle any case conversions, mangling, format
changes etc.

We assume that we have already done a chdir() to the right "root" directory
for this service.

The function will return an NTSTATUS error if some part of the name except for the last
part cannot be resolved, else NT_STATUS_OK.

Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we didn't
get any fatal errors that should immediately terminate the calling
SMB processing whilst resolving.

If the saved_last_component != 0, then the unmodified last component
of the pathname is returned there. This is used in an exceptional
case in reply_mv (so far). If saved_last_component == 0 then nothing
is returned there.

If last_component_wcard is true then a MS wildcard was detected and
should be allowed in the last component of the path only.

On exit from unix_convert, if *pst was not null, then the file stat
struct will be returned if the file exists and was found, if not this
stat struct will be filled with zeros (and this can be detected by checking
for nlinks = 0, which can never be true for any file).
****************************************************************************/

NTSTATUS unix_convert(connection_struct *conn,
			pstring name,
			BOOL allow_wcard_last_component,
			char *saved_last_component, 
			SMB_STRUCT_STAT *pst)
{
	SMB_STRUCT_STAT st;
	char *start, *end;
	pstring dirpath;
	pstring orig_path;
	BOOL component_was_mangled = False;
	BOOL name_has_wildcard = False;

	SET_STAT_INVALID(*pst);

	*dirpath = 0;

	if(saved_last_component) {
		*saved_last_component = 0;
	}

	if (conn->printer) {
		/* we don't ever use the filenames on a printer share as a
			filename - so don't convert them */
		return NT_STATUS_OK;
	}

	DEBUG(5, ("unix_convert called on file \"%s\"\n", name));

	/* 
	 * Conversion to basic unix format is already done in check_path_syntax().
	 */

	/* 
	 * Names must be relative to the root of the service - any leading /.
	 * and trailing /'s should have been trimmed by check_path_syntax().
	 */

#ifdef DEVELOPER
	SMB_ASSERT(*name != '/');
#endif

	/*
	 * If we trimmed down to a single '\0' character
	 * then we should use the "." directory to avoid
	 * searching the cache, but not if we are in a
	 * printing share.
	 * As we know this is valid we can return true here.
	 */

	if (!*name) {
		name[0] = '.';
		name[1] = '\0';
		if (SMB_VFS_STAT(conn,name,&st) == 0) {
			*pst = st;
		}
		DEBUG(5,("conversion finished \"\" -> %s\n",name));
		return NT_STATUS_OK;
	}

	if (name[0] == '.' && (name[1] == '/' || name[1] == '\0')) {
		/* Start of pathname can't be "." only. */
		if (name[1] == '\0' || name[2] == '\0') {
			return NT_STATUS_OBJECT_NAME_INVALID;
		} else {
			return determine_path_error(&name[2], allow_wcard_last_component);
		}
	}

	/*
	 * Ensure saved_last_component is valid even if file exists.
	 */

	if(saved_last_component) {
		end = strrchr_m(name, '/');
		if (end) {
			pstrcpy(saved_last_component, end + 1);
		} else {
			pstrcpy(saved_last_component, name);
		}
	}

	/*
	 * Large directory fix normalization. If we're case sensitive, and
	 * the case preserving parameters are set to "no", normalize the case of
	 * the incoming filename from the client WHETHER IT EXISTS OR NOT !
	 * This is in conflict with the current (3.0.20) man page, but is
	 * what people expect from the "large directory howto". I'll update
	 * the man page. Thanks to jht@samba.org for finding this. JRA.
	 */

	if (conn->case_sensitive && !conn->case_preserve && !conn->short_case_preserve) {
		strnorm(name, lp_defaultcase(SNUM(conn)));
	}
	
	start = name;
	pstrcpy(orig_path, name);

	if(!conn->case_sensitive && stat_cache_lookup(conn, name, dirpath, &start, &st)) {
		*pst = st;
		return NT_STATUS_OK;
	}

	/* 
	 * stat the name - if it exists then we are all done!
	 */

	if (SMB_VFS_STAT(conn,name,&st) == 0) {
		/* Ensure we catch all names with in "/."
		   this is disallowed under Windows. */
		const char *p = strstr(name, "/."); /* mb safe. */
		if (p) {
			if (p[2] == '/') {
				/* Error code within a pathname. */
				return NT_STATUS_OBJECT_PATH_NOT_FOUND;
			} else if (p[2] == '\0') {
				/* Error code at the end of a pathname. */
				return NT_STATUS_OBJECT_NAME_INVALID;
			}
		}
		stat_cache_add(orig_path, name, conn->case_sensitive);
		DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
		*pst = st;
		return NT_STATUS_OK;
	}

	DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n", name, dirpath, start));

	/* 
	 * A special case - if we don't have any mangling chars and are case
	 * sensitive then searching won't help.
	 */

	if (conn->case_sensitive && 
			!mangle_is_mangled(name, conn->params) &&
			!*lp_mangled_map(conn->params)) {
		return NT_STATUS_OK;
	}

	/* 
	 * is_mangled() was changed to look at an entire pathname, not 
	 * just a component. JRA.
	 */

	if (mangle_is_mangled(start, conn->params)) {
		component_was_mangled = True;
	}

	/* 
	 * Now we need to recursively match the name against the real 
	 * directory structure.
	 */

	/* 
	 * Match each part of the path name separately, trying the names
	 * as is first, then trying to scan the directory for matching names.
	 */

	for (; start ; start = (end?end+1:(char *)NULL)) {
		/* 
		 * Pinpoint the end of this section of the filename.
		 */
		end = strchr(start, '/'); /* mb safe. '/' can't be in any encoded char. */

		/* 
		 * Chop the name at this point.
		 */
		if (end) {
			*end = 0;
		}

		if (saved_last_component != 0) {
			pstrcpy(saved_last_component, end ? end + 1 : start);
		}

		/* The name cannot have a component of "." */

		if (ISDOT(start)) {
			if (!end)  {
				/* Error code at the end of a pathname. */
				return NT_STATUS_OBJECT_NAME_INVALID;
			}
			return determine_path_error(end+1, allow_wcard_last_component);
		}

		/* The name cannot have a wildcard if it's not
		   the last component. */

		name_has_wildcard = ms_has_wild(start);

		/* Wildcard not valid anywhere. */
		if (name_has_wildcard && !allow_wcard_last_component) {
			return NT_STATUS_OBJECT_NAME_INVALID;
		}

		/* Wildcards never valid within a pathname. */
		if (name_has_wildcard && end) {
			return NT_STATUS_OBJECT_NAME_INVALID;
		}

		/* 
		 * Check if the name exists up to this point.
		 */

		if (SMB_VFS_STAT(conn,name, &st) == 0) {
			/*
			 * It exists. it must either be a directory or this must be
			 * the last part of the path for it to be OK.
			 */
			if (end && !(st.st_mode & S_IFDIR)) {
				/*
				 * An intermediate part of the name isn't a directory.
				 */
				DEBUG(5,("Not a dir %s\n",start));
				*end = '/';
				/* 
				 * We need to return the fact that the intermediate
				 * name resolution failed. This is used to return an
				 * error of ERRbadpath rather than ERRbadfile. Some
				 * Windows applications depend on the difference between
				 * these two errors.
				 */
				return NT_STATUS_OBJECT_PATH_NOT_FOUND;
			}

			if (!end) {
				/*
				 * We just scanned for, and found the end of the path.
				 * We must return the valid stat struct.
				 * JRA.
				 */

				*pst = st;
			}

		} else {
			pstring rest;

			/* Stat failed - ensure we don't use it. */
			SET_STAT_INVALID(st);
			*rest = 0;

			/*
			 * Remember the rest of the pathname so it can be restored
			 * later.
			 */

			if (end) {
				pstrcpy(rest,end+1);
			}

			/* Reset errno so we can detect directory open errors. */
			errno = 0;

			/*
			 * Try to find this part of the path in the directory.
			 */

			if (name_has_wildcard || 
			    !scan_directory(conn, dirpath, start, sizeof(pstring) - 1 - (start - name))) {
				if (end) {
					/*
					 * An intermediate part of the name can't be found.
					 */
					DEBUG(5,("Intermediate not found %s\n",start));
					*end = '/';

					/* 
					 * We need to return the fact that the intermediate
					 * name resolution failed. This is used to return an
					 * error of ERRbadpath rather than ERRbadfile. Some
					 * Windows applications depend on the difference between
					 * these two errors.
					 */

					/* ENOENT and ENOTDIR both map to NT_STATUS_OBJECT_PATH_NOT_FOUND
					   in the filename walk. */

					if (errno == ENOENT || errno == ENOTDIR) {
						return NT_STATUS_OBJECT_PATH_NOT_FOUND;
					}
					return map_nt_error_from_unix(errno);
				}
	      
				/* ENOENT is the only valid error here. */
				if (errno != ENOENT) {
					/* ENOENT and ENOTDIR both map to NT_STATUS_OBJECT_PATH_NOT_FOUND
					   in the filename walk. */
					if (errno == ENOTDIR) {
						return NT_STATUS_OBJECT_PATH_NOT_FOUND;
					}
					return map_nt_error_from_unix(errno);
				}

				/*
				 * Just the last part of the name doesn't exist.
				 * We need to strupper() or strlower() it as
				 * this conversion may be used for file creation 
				 * purposes. Fix inspired by Thomas Neumann <t.neumann@iku-ag.de>.
				 */
				if (!conn->case_preserve ||
				    (mangle_is_8_3(start, False, conn->params) &&
						 !conn->short_case_preserve)) {
					strnorm(start, lp_defaultcase(SNUM(conn)));
				}

				/*
				 * check on the mangled stack to see if we can recover the 
				 * base of the filename.
				 */

				if (mangle_is_mangled(start, conn->params)) {
					mangle_check_cache( start, sizeof(pstring) - 1 - (start - name), conn->params);
				}

				DEBUG(5,("New file %s\n",start));
				return NT_STATUS_OK;
			}

			/* 
			 * Restore the rest of the string. If the string was mangled the size
			 * may have changed.
			 */
			if (end) {
				end = start + strlen(start);
				if (!safe_strcat(start, "/", sizeof(pstring) - 1 - (start - name)) ||
				    !safe_strcat(start, rest, sizeof(pstring) - 1 - (start - name))) {
					return map_nt_error_from_unix(ENAMETOOLONG);
				}
				*end = '\0';
			} else {
				/*
				 * We just scanned for, and found the end of the path.
				 * We must return a valid stat struct if it exists.
				 * JRA.
				 */

				if (SMB_VFS_STAT(conn,name, &st) == 0) {
					*pst = st;
				} else {
					SET_STAT_INVALID(st);
				}
			}
		} /* end else */

#ifdef DEVELOPER
		if (VALID_STAT(st) && get_delete_on_close_flag(file_id_sbuf(&st))) {
			return NT_STATUS_DELETE_PENDING;
		}
#endif

		/* 
		 * Add to the dirpath that we have resolved so far.
		 */
		if (*dirpath) {
			pstrcat(dirpath,"/");
		}

		pstrcat(dirpath,start);

		/*
		 * Don't cache a name with mangled or wildcard components
		 * as this can change the size.
		 */
		
		if(!component_was_mangled && !name_has_wildcard) {
			stat_cache_add(orig_path, dirpath, conn->case_sensitive);
		}
	
		/* 
		 * Restore the / that we wiped out earlier.
		 */
		if (end) {
			*end = '/';
		}
	}
  
	/*
	 * Don't cache a name with mangled or wildcard components
	 * as this can change the size.
	 */

	if(!component_was_mangled && !name_has_wildcard) {
		stat_cache_add(orig_path, name, conn->case_sensitive);
	}

	/* 
	 * The name has been resolved.
	 */

	DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
	return NT_STATUS_OK;
}

/****************************************************************************
 Check a filename - possibly caling reducename.
 This is called by every routine before it allows an operation on a filename.
 It does any final confirmation necessary to ensure that the filename is
 a valid one for the user to access.
****************************************************************************/

NTSTATUS check_name(connection_struct *conn, const pstring name)
{
	if (IS_VETO_PATH(conn, name))  {
		/* Is it not dot or dot dot. */
		if (!((name[0] == '.') && (!name[1] || (name[1] == '.' && !name[2])))) {
			DEBUG(5,("check_name: file path name %s vetoed\n",name));
			return map_nt_error_from_unix(ENOENT);
		}
	}

	if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
		NTSTATUS status = reduce_name(conn,name);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(5,("check_name: name %s failed with %s\n",name, nt_errstr(status)));
			return status;
		}
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Scan a directory to find a filename, matching without case sensitivity.
 If the name looks like a mangled name then try via the mangling functions
****************************************************************************/

static BOOL scan_directory(connection_struct *conn, const char *path, char *name, size_t maxlength)
{
	struct smb_Dir *cur_dir;
	const char *dname;
	BOOL mangled;
	long curpos;

	mangled = mangle_is_mangled(name, conn->params);

	/* handle null paths */
	if (*path == 0)
		path = ".";

	/*
	 * The incoming name can be mangled, and if we de-mangle it
	 * here it will not compare correctly against the filename (name2)
	 * read from the directory and then mangled by the mangle_map()
	 * call. We need to mangle both names or neither.
	 * (JRA).
	 *
	 * Fix for bug found by Dina Fine. If in case sensitive mode then
	 * the mangle cache is no good (3 letter extension could be wrong
	 * case - so don't demangle in this case - leave as mangled and
	 * allow the mangling of the directory entry read (which is done
	 * case insensitively) to match instead. This will lead to more
	 * false positive matches but we fail completely without it. JRA.
	 */

	if (mangled && !conn->case_sensitive) {
		mangled = !mangle_check_cache( name, maxlength, conn->params);
	}

	/* open the directory */
	if (!(cur_dir = OpenDir(conn, path, NULL, 0))) {
		DEBUG(3,("scan dir didn't open dir [%s]\n",path));
		return(False);
	}

	/* now scan for matching names */
	curpos = 0;
	while ((dname = ReadDirName(cur_dir, &curpos))) {

		/* Is it dot or dot dot. */
		if ((dname[0] == '.') && (!dname[1] || (dname[1] == '.' && !dname[2]))) {
			continue;
		}

		/*
		 * At this point dname is the unmangled name.
		 * name is either mangled or not, depending on the state of the "mangled"
		 * variable. JRA.
		 */

		/*
		 * Check mangled name against mangled name, or unmangled name
		 * against unmangled name.
		 */

		if ((mangled && mangled_equal(name,dname,conn->params)) || fname_equal(name, dname, conn->case_sensitive)) {
			/* we've found the file, change it's name and return */
			safe_strcpy(name, dname, maxlength);
			CloseDir(cur_dir);
			return(True);
		}
	}

	CloseDir(cur_dir);
	errno = ENOENT;
	return(False);
}