summaryrefslogtreecommitdiff
path: root/source3/smbd/filename.c
blob: 9dd1523c73d8c464413587b6e3fff539f0deabb0 (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
/* 
   Unix SMB/CIFS implementation.
   filename handling routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 1999-200
   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"

extern BOOL case_sensitive;
extern BOOL case_preserve;
extern BOOL short_case_preserve;
extern BOOL use_mangled_map;

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

/****************************************************************************
 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)
{
	/* 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, int snum)
{
	pstring tmpname;
	
	pstrcpy(tmpname, name2);
	mangle_map(tmpname, True, False, snum);
	return strequal(name1, tmpname);
}

/****************************************************************************
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 False if some part of the name except for the last
part cannot be resolved

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.

The bad_path arg is set to True if the filename walk failed. This is
used to pick the correct error code to return between ENOENT and ENOTDIR
as Windows applications depend on ERRbadpath being returned if a component
of a pathname does not exist.

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).
****************************************************************************/

BOOL unix_convert(pstring name,connection_struct *conn,char *saved_last_component, 
                  BOOL *bad_path, 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;

	ZERO_STRUCTP(pst);

	*dirpath = 0;
	*bad_path = False;
	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 True;
	}

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

	/* 
	 * Convert to basic unix format - removing \ chars and cleaning it up.
	 */

	unix_format(name);
	unix_clean_name(name);

	/* 
	 * Names must be relative to the root of the service - trim any leading /.
	 * also trim trailing /'s.
	 */

	trim_string(name,"/","/");

	/*
	 * 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.
	 */

	if (!*name) {
		name[0] = '.';
		name[1] = '\0';
	}

	/*
	 * 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);
	}

	if (!case_sensitive && (!case_preserve || (mangle_is_8_3(name, False) && !short_case_preserve)))
		strnorm(name);

	/*
	 * If we trimmed down to a single '\0' character
	 * then we will be using the "." directory.
	 * As we know this is valid we can return true here.
	 */

	if(!*name)
		return(True);

	start = name;
	while (strncmp(start,"./",2) == 0)
		start += 2;

	pstrcpy(orig_path, name);

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

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

	if (vfs_stat(conn,name,&st) == 0) {
		stat_cache_add(orig_path, name);
		DEBUG(5,("conversion finished %s -> %s\n",orig_path, name));
		*pst = st;
		return(True);
	}

	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 (case_sensitive && !mangle_is_mangled(name) && !use_mangled_map)
		return(False);

	name_has_wildcard = ms_has_wild(start);

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

	if (mangle_is_mangled(start))
		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_m(start, '/');

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

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

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

		if (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 = '/';
				return(False);
			}

			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. */
			ZERO_STRUCT(st);
			*rest = 0;

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

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

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

			if (ms_has_wild(start) || 
			    !scan_directory(dirpath, start, 
					    sizeof(pstring) - 1 - (start - name), 
					    conn, 
					    end?True:False)) {
				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.
					 */
					*bad_path = True;
					return(False);
				}
	      
				/* 
				 * Just the last part of the name doesn't exist.
				 * We may need to strupper() or strlower() it in case
				 * this conversion is being used for file creation 
				 * purposes. If the filename is of mixed case then 
				 * don't normalise it.
				 */

				if (!case_preserve && (!strhasupper(start) || !strhaslower(start)))		
					strnorm(start);

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

				if (mangle_is_mangled(start)) {
					mangle_check_cache( start );
				}

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

			/* 
			 * 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 False;
				}
				*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 (vfs_stat(conn,name, &st) == 0) {
					*pst = st;
				} else {
					ZERO_STRUCT(st);
				}
			}
		} /* end else */

		/* 
		 * 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);
	
		/* 
		 * 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);

	/*
	 * If we ended up resolving the entire path then return a valid
	 * stat struct if we got one. Note this doesn't catch mangled paths,
	 * but the check in the for loop above will do that. JRA.
	 */

	if (VALID_STAT(st) && (strlen(orig_path) == strlen(name)))
		*pst = st;

	/* 
	 * The name has been resolved.
	 */

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

/****************************************************************************
 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.
****************************************************************************/

BOOL check_name(pstring name,connection_struct *conn)
{
	BOOL ret;

	errno = 0;

	if (IS_VETO_PATH(conn, name))  {
		if(strcmp(name, ".") && strcmp(name, "..")) {
			DEBUG(5,("file path name %s vetoed\n",name));
			return(0);
		}
	}

	ret = reduce_name(conn,name,conn->connectpath,lp_widelinks(SNUM(conn)));

	/* Check if we are allowing users to follow symlinks */
	/* Patch from David Clerc <David.Clerc@cui.unige.ch>
		University of Geneva */

#ifdef S_ISLNK
	if (!lp_symlinks(SNUM(conn))) {
		SMB_STRUCT_STAT statbuf;
		if ( (conn->vfs_ops.lstat(conn,name,&statbuf) != -1) &&
				(S_ISLNK(statbuf.st_mode)) ) {
			DEBUG(3,("check_name: denied: file path name %s is a symlink\n",name));
			ret=0; 
		}
	}
#endif

	if (!ret)
		DEBUG(5,("check_name on %s failed\n",name));

	return(ret);
}

/****************************************************************************
 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(const char *path, char *name, size_t maxlength, 
			   connection_struct *conn,BOOL docache)
{
	void *cur_dir;
	const char *dname;
	BOOL mangled;

	mangled = mangle_is_mangled(name);

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

	if (docache && (dname = DirCacheCheck(path,name,SNUM(conn)))) {
		safe_strcpy(name, dname, maxlength);	
		return(True);
	}      

	/*
	 * 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).
	 */
	if (mangled)
		mangled = !mangle_check_cache( name );

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

	/* now scan for matching names */
	while ((dname = ReadDirName(cur_dir))) {
		if (*dname == '.' && (strequal(dname,".") || strequal(dname,"..")))
			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,SNUM(conn))) || fname_equal(name, dname)) {
			/* we've found the file, change it's name and return */
			if (docache)
				DirCacheAdd(path,name,dname,SNUM(conn));
			safe_strcpy(name, dname, maxlength);
			CloseDir(cur_dir);
			return(True);
		}
	}

	CloseDir(cur_dir);
	return(False);
}