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Allow "store dos attributes" to override the other "map XXX" parameters.
[Samba.git] / source3 / smbd / dosmode.c
blob04d27c7a2eb4e6c268bf5758b6cbe1ae52966967
1 /*
2 Unix SMB/CIFS implementation.
3 dos mode handling functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) James Peach 2006
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "system/filesys.h"
23 #include "librpc/gen_ndr/ndr_xattr.h"
24 #include "../libcli/security/security.h"
25 #include "smbd/smbd.h"
26 #include "lib/param/loadparm.h"
27
28 static uint32_t filter_mode_by_protocol(uint32_t mode)
29 {
30 if (get_Protocol() <= PROTOCOL_LANMAN2) {
31 DEBUG(10,("filter_mode_by_protocol: "
32 "filtering result 0x%x to 0x%x\n",
33 (unsigned int)mode,
34 (unsigned int)(mode & 0x3f) ));
35 mode &= 0x3f;
36 }
37 return mode;
38 }
39
40 static int set_link_read_only_flag(const SMB_STRUCT_STAT *const sbuf)
41 {
42 #ifdef S_ISLNK
43 #if LINKS_READ_ONLY
44 if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
45 return FILE_ATTRIBUTE_READONLY;
46 #endif
47 #endif
48 return 0;
49 }
50
51 /****************************************************************************
52 Change a dos mode to a unix mode.
53 Base permission for files:
54 if creating file and inheriting (i.e. parent_dir != NULL)
55 apply read/write bits from parent directory.
56 else
57 everybody gets read bit set
58 dos readonly is represented in unix by removing everyone's write bit
59 dos archive is represented in unix by the user's execute bit
60 dos system is represented in unix by the group's execute bit
61 dos hidden is represented in unix by the other's execute bit
62 if !inheriting {
63 Then apply create mask,
64 then add force bits.
65 }
66 Base permission for directories:
67 dos directory is represented in unix by unix's dir bit and the exec bit
68 if !inheriting {
69 Then apply create mask,
70 then add force bits.
71 }
72 ****************************************************************************/
73
74 mode_t unix_mode(connection_struct *conn, int dosmode,
75 const struct smb_filename *smb_fname,
76 const char *inherit_from_dir)
77 {
78 mode_t result = (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
79 mode_t dir_mode = 0; /* Mode of the inherit_from directory if
80 * inheriting. */
81
82 if (!lp_store_dos_attributes(SNUM(conn)) && IS_DOS_READONLY(dosmode)) {
83 result &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
84 }
85
86 if ((inherit_from_dir != NULL) && lp_inherit_perms(SNUM(conn))) {
87 struct smb_filename *smb_fname_parent;
88
89 DEBUG(2, ("unix_mode(%s) inheriting from %s\n",
90 smb_fname_str_dbg(smb_fname),
91 inherit_from_dir));
92
93 smb_fname_parent = synthetic_smb_fname(
94 talloc_tos(), inherit_from_dir, NULL, NULL);
95 if (smb_fname_parent == NULL) {
96 DEBUG(1,("unix_mode(%s) failed, [dir %s]: No memory\n",
97 smb_fname_str_dbg(smb_fname),
98 inherit_from_dir));
99 return(0);
100 }
101
102 if (SMB_VFS_STAT(conn, smb_fname_parent) != 0) {
103 DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",
104 smb_fname_str_dbg(smb_fname),
105 inherit_from_dir, strerror(errno)));
106 TALLOC_FREE(smb_fname_parent);
107 return(0); /* *** shouldn't happen! *** */
108 }
109
110 /* Save for later - but explicitly remove setuid bit for safety. */
111 dir_mode = smb_fname_parent->st.st_ex_mode & ~S_ISUID;
112 DEBUG(2,("unix_mode(%s) inherit mode %o\n",
113 smb_fname_str_dbg(smb_fname), (int)dir_mode));
114 /* Clear "result" */
115 result = 0;
116 TALLOC_FREE(smb_fname_parent);
117 }
118
119 if (IS_DOS_DIR(dosmode)) {
120 /* We never make directories read only for the owner as under DOS a user
121 can always create a file in a read-only directory. */
122 result |= (S_IFDIR | S_IWUSR);
123
124 if (dir_mode) {
125 /* Inherit mode of parent directory. */
126 result |= dir_mode;
127 } else {
128 /* Provisionally add all 'x' bits */
129 result |= (S_IXUSR | S_IXGRP | S_IXOTH);
130
131 /* Apply directory mask */
132 result &= lp_dir_mask(SNUM(conn));
133 /* Add in force bits */
134 result |= lp_force_dir_mode(SNUM(conn));
135 }
136 } else {
137 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
138 result |= S_IXUSR;
139
140 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
141 result |= S_IXGRP;
142
143 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
144 result |= S_IXOTH;
145
146 if (dir_mode) {
147 /* Inherit 666 component of parent directory mode */
148 result |= dir_mode & (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
149 } else {
150 /* Apply mode mask */
151 result &= lp_create_mask(SNUM(conn));
152 /* Add in force bits */
153 result |= lp_force_create_mode(SNUM(conn));
154 }
155 }
156
157 DEBUG(3,("unix_mode(%s) returning 0%o\n", smb_fname_str_dbg(smb_fname),
158 (int)result));
159 return(result);
160 }
161
162 /****************************************************************************
163 Change a unix mode to a dos mode.
164 ****************************************************************************/
165
166 static uint32 dos_mode_from_sbuf(connection_struct *conn,
167 const struct smb_filename *smb_fname)
168 {
169 int result = 0;
170 enum mapreadonly_options ro_opts = (enum mapreadonly_options)lp_map_readonly(SNUM(conn));
171
172 #if defined(UF_IMMUTABLE) && defined(SF_IMMUTABLE)
173 /* if we can find out if a file is immutable we should report it r/o */
174 if (smb_fname->st.st_ex_flags & (UF_IMMUTABLE | SF_IMMUTABLE)) {
175 result |= FILE_ATTRIBUTE_READONLY;
176 }
177 #endif
178 if (ro_opts == MAP_READONLY_YES) {
179 /* Original Samba method - map inverse of user "w" bit. */
180 if ((smb_fname->st.st_ex_mode & S_IWUSR) == 0) {
181 result |= FILE_ATTRIBUTE_READONLY;
182 }
183 } else if (ro_opts == MAP_READONLY_PERMISSIONS) {
184 /* Check actual permissions for read-only. */
185 if (!can_write_to_file(conn, smb_fname)) {
186 result |= FILE_ATTRIBUTE_READONLY;
187 }
188 } /* Else never set the readonly bit. */
189
190 if (MAP_ARCHIVE(conn) && ((smb_fname->st.st_ex_mode & S_IXUSR) != 0))
191 result |= FILE_ATTRIBUTE_ARCHIVE;
192
193 if (MAP_SYSTEM(conn) && ((smb_fname->st.st_ex_mode & S_IXGRP) != 0))
194 result |= FILE_ATTRIBUTE_SYSTEM;
195
196 if (MAP_HIDDEN(conn) && ((smb_fname->st.st_ex_mode & S_IXOTH) != 0))
197 result |= FILE_ATTRIBUTE_HIDDEN;
198
199 if (S_ISDIR(smb_fname->st.st_ex_mode))
200 result = FILE_ATTRIBUTE_DIRECTORY | (result & FILE_ATTRIBUTE_READONLY);
201
202 result |= set_link_read_only_flag(&smb_fname->st);
203
204 DEBUG(8,("dos_mode_from_sbuf returning "));
205
206 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
207 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
208 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
209 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
210 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
211
212 DEBUG(8,("\n"));
213 return result;
214 }
215
216 /****************************************************************************
217 Get DOS attributes from an EA.
218 This can also pull the create time into the stat struct inside smb_fname.
219 ****************************************************************************/
220
221 static bool get_ea_dos_attribute(connection_struct *conn,
222 struct smb_filename *smb_fname,
223 uint32 *pattr)
224 {
225 struct xattr_DOSATTRIB dosattrib;
226 enum ndr_err_code ndr_err;
227 DATA_BLOB blob;
228 ssize_t sizeret;
229 fstring attrstr;
230 uint32_t dosattr;
231
232 if (!lp_store_dos_attributes(SNUM(conn))) {
233 return False;
234 }
235
236 /* Don't reset pattr to zero as we may already have filename-based attributes we
237 need to preserve. */
238
239 sizeret = SMB_VFS_GETXATTR(conn, smb_fname->base_name,
240 SAMBA_XATTR_DOS_ATTRIB, attrstr,
241 sizeof(attrstr));
242 if (sizeret == -1) {
243 if (errno == ENOSYS
244 #if defined(ENOTSUP)
245 || errno == ENOTSUP) {
246 #else
247 ) {
248 #endif
249 DEBUG(1,("get_ea_dos_attribute: Cannot get attribute "
250 "from EA on file %s: Error = %s\n",
251 smb_fname_str_dbg(smb_fname),
252 strerror(errno)));
253 set_store_dos_attributes(SNUM(conn), False);
254 }
255 return False;
256 }
257
258 blob.data = (uint8_t *)attrstr;
259 blob.length = sizeret;
260
261 ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), &dosattrib,
262 (ndr_pull_flags_fn_t)ndr_pull_xattr_DOSATTRIB);
263
264 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
265 DEBUG(1,("get_ea_dos_attribute: bad ndr decode "
266 "from EA on file %s: Error = %s\n",
267 smb_fname_str_dbg(smb_fname),
268 ndr_errstr(ndr_err)));
269 return false;
270 }
271
272 DEBUG(10,("get_ea_dos_attribute: %s attr = %s\n",
273 smb_fname_str_dbg(smb_fname), dosattrib.attrib_hex));
274
275 switch (dosattrib.version) {
276 case 0xFFFF:
277 dosattr = dosattrib.info.compatinfoFFFF.attrib;
278 break;
279 case 1:
280 dosattr = dosattrib.info.info1.attrib;
281 if (!null_nttime(dosattrib.info.info1.create_time)) {
282 struct timespec create_time =
283 nt_time_to_unix_timespec(
284 &dosattrib.info.info1.create_time);
285
286 update_stat_ex_create_time(&smb_fname->st,
287 create_time);
288
289 DEBUG(10,("get_ea_dos_attribute: file %s case 1 "
290 "set btime %s\n",
291 smb_fname_str_dbg(smb_fname),
292 time_to_asc(convert_timespec_to_time_t(
293 create_time)) ));
294 }
295 break;
296 case 2:
297 dosattr = dosattrib.info.oldinfo2.attrib;
298 /* Don't know what flags to check for this case. */
299 break;
300 case 3:
301 dosattr = dosattrib.info.info3.attrib;
302 if ((dosattrib.info.info3.valid_flags & XATTR_DOSINFO_CREATE_TIME) &&
303 !null_nttime(dosattrib.info.info3.create_time)) {
304 struct timespec create_time =
305 nt_time_to_unix_timespec(
306 &dosattrib.info.info3.create_time);
307
308 update_stat_ex_create_time(&smb_fname->st,
309 create_time);
310
311 DEBUG(10,("get_ea_dos_attribute: file %s case 3 "
312 "set btime %s\n",
313 smb_fname_str_dbg(smb_fname),
314 time_to_asc(convert_timespec_to_time_t(
315 create_time)) ));
316 }
317 break;
318 default:
319 DEBUG(1,("get_ea_dos_attribute: Badly formed DOSATTRIB on "
320 "file %s - %s\n", smb_fname_str_dbg(smb_fname),
321 attrstr));
322 return false;
323 }
324
325 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
326 dosattr |= FILE_ATTRIBUTE_DIRECTORY;
327 }
328 /* FILE_ATTRIBUTE_SPARSE is valid on get but not on set. */
329 *pattr = (uint32)(dosattr & (SAMBA_ATTRIBUTES_MASK|FILE_ATTRIBUTE_SPARSE));
330
331 DEBUG(8,("get_ea_dos_attribute returning (0x%x)", dosattr));
332
333 if (dosattr & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
334 if (dosattr & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
335 if (dosattr & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
336 if (dosattr & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
337 if (dosattr & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
338
339 DEBUG(8,("\n"));
340
341 return True;
342 }
343
344 /****************************************************************************
345 Set DOS attributes in an EA.
346 Also sets the create time.
347 ****************************************************************************/
348
349 static bool set_ea_dos_attribute(connection_struct *conn,
350 struct smb_filename *smb_fname,
351 uint32 dosmode)
352 {
353 struct xattr_DOSATTRIB dosattrib;
354 enum ndr_err_code ndr_err;
355 DATA_BLOB blob;
356
357 ZERO_STRUCT(dosattrib);
358 ZERO_STRUCT(blob);
359
360 dosattrib.version = 3;
361 dosattrib.info.info3.valid_flags = XATTR_DOSINFO_ATTRIB|
362 XATTR_DOSINFO_CREATE_TIME;
363 dosattrib.info.info3.attrib = dosmode;
364 unix_timespec_to_nt_time(&dosattrib.info.info3.create_time,
365 smb_fname->st.st_ex_btime);
366
367 DEBUG(10,("set_ea_dos_attributes: set attribute 0x%x, btime = %s on file %s\n",
368 (unsigned int)dosmode,
369 time_to_asc(convert_timespec_to_time_t(smb_fname->st.st_ex_btime)),
370 smb_fname_str_dbg(smb_fname) ));
371
372 ndr_err = ndr_push_struct_blob(
373 &blob, talloc_tos(), &dosattrib,
374 (ndr_push_flags_fn_t)ndr_push_xattr_DOSATTRIB);
375
376 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
377 DEBUG(5, ("create_acl_blob: ndr_push_xattr_DOSATTRIB failed: %s\n",
378 ndr_errstr(ndr_err)));
379 return false;
380 }
381
382 if (blob.data == NULL || blob.length == 0) {
383 return false;
384 }
385
386 if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
387 SAMBA_XATTR_DOS_ATTRIB, blob.data, blob.length,
388 0) == -1) {
389 bool ret = false;
390 files_struct *fsp = NULL;
391
392 if((errno != EPERM) && (errno != EACCES)) {
393 if (errno == ENOSYS
394 #if defined(ENOTSUP)
395 || errno == ENOTSUP) {
396 #else
397 ) {
398 #endif
399 DEBUG(1,("set_ea_dos_attributes: Cannot set "
400 "attribute EA on file %s: Error = %s\n",
401 smb_fname_str_dbg(smb_fname),
402 strerror(errno) ));
403 set_store_dos_attributes(SNUM(conn), False);
404 }
405 return false;
406 }
407
408 /* We want DOS semantics, ie allow non owner with write permission to change the
409 bits on a file. Just like file_ntimes below.
410 */
411
412 /* Check if we have write access. */
413 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
414 return false;
415
416 if (!can_write_to_file(conn, smb_fname)) {
417 return false;
418 }
419
420 /*
421 * We need to open the file with write access whilst
422 * still in our current user context. This ensures we
423 * are not violating security in doing the setxattr.
424 */
425
426 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname,
427 &fsp)))
428 return false;
429 become_root();
430 if (SMB_VFS_FSETXATTR(fsp,
431 SAMBA_XATTR_DOS_ATTRIB, blob.data,
432 blob.length, 0) == 0) {
433 ret = true;
434 }
435 unbecome_root();
436 close_file(NULL, fsp, NORMAL_CLOSE);
437 return ret;
438 }
439 DEBUG(10,("set_ea_dos_attribute: set EA 0x%x on file %s\n",
440 (unsigned int)dosmode,
441 smb_fname_str_dbg(smb_fname)));
442 return true;
443 }
444
445 /****************************************************************************
446 Change a unix mode to a dos mode for an ms dfs link.
447 ****************************************************************************/
448
449 uint32 dos_mode_msdfs(connection_struct *conn,
450 const struct smb_filename *smb_fname)
451 {
452 uint32 result = 0;
453
454 DEBUG(8,("dos_mode_msdfs: %s\n", smb_fname_str_dbg(smb_fname)));
455
456 if (!VALID_STAT(smb_fname->st)) {
457 return 0;
458 }
459
460 /* First do any modifications that depend on the path name. */
461 /* hide files with a name starting with a . */
462 if (lp_hide_dot_files(SNUM(conn))) {
463 const char *p = strrchr_m(smb_fname->base_name, '/');
464 if (p) {
465 p++;
466 } else {
467 p = smb_fname->base_name;
468 }
469
470 /* Only . and .. are not hidden. */
471 if (p[0] == '.' && !((p[1] == '\0') ||
472 (p[1] == '.' && p[2] == '\0'))) {
473 result |= FILE_ATTRIBUTE_HIDDEN;
474 }
475 }
476
477 result |= dos_mode_from_sbuf(conn, smb_fname);
478
479 /* Optimization : Only call is_hidden_path if it's not already
480 hidden. */
481 if (!(result & FILE_ATTRIBUTE_HIDDEN) &&
482 IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
483 result |= FILE_ATTRIBUTE_HIDDEN;
484 }
485
486 if (result == 0) {
487 result = FILE_ATTRIBUTE_NORMAL;
488 }
489
490 result = filter_mode_by_protocol(result);
491
492 DEBUG(8,("dos_mode_msdfs returning "));
493
494 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
495 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
496 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
497 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
498 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
499 if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
500
501 DEBUG(8,("\n"));
502
503 return(result);
504 }
505
506 #ifdef HAVE_STAT_DOS_FLAGS
507 /****************************************************************************
508 Convert dos attributes (FILE_ATTRIBUTE_*) to dos stat flags (UF_*)
509 ****************************************************************************/
510
511 int dos_attributes_to_stat_dos_flags(uint32_t dosmode)
512 {
513 uint32_t dos_stat_flags = 0;
514
515 if (dosmode & FILE_ATTRIBUTE_ARCHIVE)
516 dos_stat_flags |= UF_DOS_ARCHIVE;
517 if (dosmode & FILE_ATTRIBUTE_HIDDEN)
518 dos_stat_flags |= UF_DOS_HIDDEN;
519 if (dosmode & FILE_ATTRIBUTE_READONLY)
520 dos_stat_flags |= UF_DOS_RO;
521 if (dosmode & FILE_ATTRIBUTE_SYSTEM)
522 dos_stat_flags |= UF_DOS_SYSTEM;
523 if (dosmode & FILE_ATTRIBUTE_NONINDEXED)
524 dos_stat_flags |= UF_DOS_NOINDEX;
525
526 return dos_stat_flags;
527 }
528
529 /****************************************************************************
530 Gets DOS attributes, accessed via st_ex_flags in the stat struct.
531 ****************************************************************************/
532
533 static bool get_stat_dos_flags(connection_struct *conn,
534 const struct smb_filename *smb_fname,
535 uint32_t *dosmode)
536 {
537 SMB_ASSERT(VALID_STAT(smb_fname->st));
538 SMB_ASSERT(dosmode);
539
540 if (!lp_store_dos_attributes(SNUM(conn))) {
541 return false;
542 }
543
544 DEBUG(5, ("Getting stat dos attributes for %s.\n",
545 smb_fname_str_dbg(smb_fname)));
546
547 if (smb_fname->st.st_ex_flags & UF_DOS_ARCHIVE)
548 *dosmode |= FILE_ATTRIBUTE_ARCHIVE;
549 if (smb_fname->st.st_ex_flags & UF_DOS_HIDDEN)
550 *dosmode |= FILE_ATTRIBUTE_HIDDEN;
551 if (smb_fname->st.st_ex_flags & UF_DOS_RO)
552 *dosmode |= FILE_ATTRIBUTE_READONLY;
553 if (smb_fname->st.st_ex_flags & UF_DOS_SYSTEM)
554 *dosmode |= FILE_ATTRIBUTE_SYSTEM;
555 if (smb_fname->st.st_ex_flags & UF_DOS_NOINDEX)
556 *dosmode |= FILE_ATTRIBUTE_NONINDEXED;
557 if (smb_fname->st.st_ex_flags & FILE_ATTRIBUTE_SPARSE)
558 *dosmode |= FILE_ATTRIBUTE_SPARSE;
559 if (S_ISDIR(smb_fname->st.st_ex_mode))
560 *dosmode |= FILE_ATTRIBUTE_DIRECTORY;
561
562 *dosmode |= set_link_read_only_flag(&smb_fname->st);
563
564 return true;
565 }
566
567 /****************************************************************************
568 Sets DOS attributes, stored in st_ex_flags of the inode.
569 ****************************************************************************/
570
571 static bool set_stat_dos_flags(connection_struct *conn,
572 const struct smb_filename *smb_fname,
573 uint32_t dosmode,
574 bool *attributes_changed)
575 {
576 uint32_t new_flags = 0;
577 int error = 0;
578
579 SMB_ASSERT(VALID_STAT(smb_fname->st));
580 SMB_ASSERT(attributes_changed);
581
582 *attributes_changed = false;
583
584 if (!lp_store_dos_attributes(SNUM(conn))) {
585 return false;
586 }
587
588 DEBUG(5, ("Setting stat dos attributes for %s.\n",
589 smb_fname_str_dbg(smb_fname)));
590
591 new_flags = (smb_fname->st.st_ex_flags & ~UF_DOS_FLAGS) |
592 dos_attributes_to_stat_dos_flags(dosmode);
593
594 /* Return early if no flags changed. */
595 if (new_flags == smb_fname->st.st_ex_flags)
596 return true;
597
598 DEBUG(5, ("Setting stat dos attributes=0x%x, prev=0x%x\n", new_flags,
599 smb_fname->st.st_ex_flags));
600
601 /* Set new flags with chflags. */
602 error = SMB_VFS_CHFLAGS(conn, smb_fname->base_name, new_flags);
603 if (error) {
604 DEBUG(0, ("Failed setting new stat dos attributes (0x%x) on "
605 "file %s! errno=%d\n", new_flags,
606 smb_fname_str_dbg(smb_fname), errno));
607 return false;
608 }
609
610 *attributes_changed = true;
611 return true;
612 }
613 #endif /* HAVE_STAT_DOS_FLAGS */
614
615 /****************************************************************************
616 Change a unix mode to a dos mode.
617 May also read the create timespec into the stat struct in smb_fname
618 if "store dos attributes" is true.
619 ****************************************************************************/
620
621 uint32 dos_mode(connection_struct *conn, struct smb_filename *smb_fname)
622 {
623 uint32 result = 0;
624 bool offline, used_stat_dos_flags = false;
625
626 DEBUG(8,("dos_mode: %s\n", smb_fname_str_dbg(smb_fname)));
627
628 if (!VALID_STAT(smb_fname->st)) {
629 return 0;
630 }
631
632 /* First do any modifications that depend on the path name. */
633 /* hide files with a name starting with a . */
634 if (lp_hide_dot_files(SNUM(conn))) {
635 const char *p = strrchr_m(smb_fname->base_name,'/');
636 if (p) {
637 p++;
638 } else {
639 p = smb_fname->base_name;
640 }
641
642 /* Only . and .. are not hidden. */
643 if (p[0] == '.' && !((p[1] == '\0') ||
644 (p[1] == '.' && p[2] == '\0'))) {
645 result |= FILE_ATTRIBUTE_HIDDEN;
646 }
647 }
648
649 #ifdef HAVE_STAT_DOS_FLAGS
650 used_stat_dos_flags = get_stat_dos_flags(conn, smb_fname, &result);
651 #endif
652 if (!used_stat_dos_flags) {
653 /* Get the DOS attributes from an EA by preference. */
654 if (!get_ea_dos_attribute(conn, smb_fname, &result)) {
655 result |= dos_mode_from_sbuf(conn, smb_fname);
656 }
657 }
658
659 offline = SMB_VFS_IS_OFFLINE(conn, smb_fname, &smb_fname->st);
660 if (S_ISREG(smb_fname->st.st_ex_mode) && offline) {
661 result |= FILE_ATTRIBUTE_OFFLINE;
662 }
663
664 /* Optimization : Only call is_hidden_path if it's not already
665 hidden. */
666 if (!(result & FILE_ATTRIBUTE_HIDDEN) &&
667 IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
668 result |= FILE_ATTRIBUTE_HIDDEN;
669 }
670
671 if (result == 0) {
672 result = FILE_ATTRIBUTE_NORMAL;
673 }
674
675 result = filter_mode_by_protocol(result);
676
677 DEBUG(8,("dos_mode returning "));
678
679 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
680 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
681 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
682 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
683 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
684 if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
685 if (result & FILE_ATTRIBUTE_OFFLINE ) DEBUG(8, ("[offline]"));
686
687 DEBUG(8,("\n"));
688
689 return(result);
690 }
691
692 /*******************************************************************
693 chmod a file - but preserve some bits.
694 If "store dos attributes" is also set it will store the create time
695 from the stat struct in smb_fname (in NTTIME format) in the EA
696 attribute also.
697 ********************************************************************/
698
699 int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
700 uint32 dosmode, const char *parent_dir, bool newfile)
701 {
702 int mask=0;
703 mode_t tmp;
704 mode_t unixmode;
705 int ret = -1, lret = -1;
706 uint32_t old_mode;
707 struct timespec new_create_timespec;
708 files_struct *fsp = NULL;
709
710 if (!CAN_WRITE(conn)) {
711 errno = EROFS;
712 return -1;
713 }
714
715 /* We only allow READONLY|HIDDEN|SYSTEM|DIRECTORY|ARCHIVE here. */
716 dosmode &= (SAMBA_ATTRIBUTES_MASK | FILE_ATTRIBUTE_OFFLINE);
717
718 DEBUG(10,("file_set_dosmode: setting dos mode 0x%x on file %s\n",
719 dosmode, smb_fname_str_dbg(smb_fname)));
720
721 unixmode = smb_fname->st.st_ex_mode;
722
723 get_acl_group_bits(conn, smb_fname->base_name,
724 &smb_fname->st.st_ex_mode);
725
726 if (S_ISDIR(smb_fname->st.st_ex_mode))
727 dosmode |= FILE_ATTRIBUTE_DIRECTORY;
728 else
729 dosmode &= ~FILE_ATTRIBUTE_DIRECTORY;
730
731 new_create_timespec = smb_fname->st.st_ex_btime;
732
733 old_mode = dos_mode(conn, smb_fname);
734
735 if (dosmode & FILE_ATTRIBUTE_OFFLINE) {
736 if (!(old_mode & FILE_ATTRIBUTE_OFFLINE)) {
737 lret = SMB_VFS_SET_OFFLINE(conn, smb_fname);
738 if (lret == -1) {
739 DEBUG(0, ("set_dos_mode: client has asked to "
740 "set FILE_ATTRIBUTE_OFFLINE to "
741 "%s/%s but there was an error while "
742 "setting it or it is not "
743 "supported.\n", parent_dir,
744 smb_fname_str_dbg(smb_fname)));
745 }
746 }
747 }
748
749 dosmode &= ~FILE_ATTRIBUTE_OFFLINE;
750 old_mode &= ~FILE_ATTRIBUTE_OFFLINE;
751
752 smb_fname->st.st_ex_btime = new_create_timespec;
753
754 #ifdef HAVE_STAT_DOS_FLAGS
755 {
756 bool attributes_changed;
757
758 if (set_stat_dos_flags(conn, smb_fname, dosmode,
759 &attributes_changed))
760 {
761 if (!newfile && attributes_changed) {
762 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
763 FILE_NOTIFY_CHANGE_ATTRIBUTES,
764 smb_fname->base_name);
765 }
766 smb_fname->st.st_ex_mode = unixmode;
767 return 0;
768 }
769 }
770 #endif
771 /* Store the DOS attributes in an EA by preference. */
772 if (lp_store_dos_attributes(SNUM(conn))) {
773 /*
774 * Don't fall back to using UNIX modes. Finally
775 * follow the smb.conf manpage.
776 */
777 if (!set_ea_dos_attribute(conn, smb_fname, dosmode)) {
778 return -1;
779 }
780 if (!newfile) {
781 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
782 FILE_NOTIFY_CHANGE_ATTRIBUTES,
783 smb_fname->base_name);
784 }
785 smb_fname->st.st_ex_mode = unixmode;
786 return 0;
787 }
788
789 unixmode = unix_mode(conn, dosmode, smb_fname, parent_dir);
790
791 /* preserve the file type bits */
792 mask |= S_IFMT;
793
794 /* preserve the s bits */
795 mask |= (S_ISUID | S_ISGID);
796
797 /* preserve the t bit */
798 #ifdef S_ISVTX
799 mask |= S_ISVTX;
800 #endif
801
802 /* possibly preserve the x bits */
803 if (!MAP_ARCHIVE(conn))
804 mask |= S_IXUSR;
805 if (!MAP_SYSTEM(conn))
806 mask |= S_IXGRP;
807 if (!MAP_HIDDEN(conn))
808 mask |= S_IXOTH;
809
810 unixmode |= (smb_fname->st.st_ex_mode & mask);
811
812 /* if we previously had any r bits set then leave them alone */
813 if ((tmp = smb_fname->st.st_ex_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
814 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
815 unixmode |= tmp;
816 }
817
818 /* if we previously had any w bits set then leave them alone
819 whilst adding in the new w bits, if the new mode is not rdonly */
820 if (!IS_DOS_READONLY(dosmode)) {
821 unixmode |= (smb_fname->st.st_ex_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
822 }
823
824 /*
825 * From the chmod 2 man page:
826 *
827 * "If the calling process is not privileged, and the group of the file
828 * does not match the effective group ID of the process or one of its
829 * supplementary group IDs, the S_ISGID bit will be turned off, but
830 * this will not cause an error to be returned."
831 *
832 * Simply refuse to do the chmod in this case.
833 */
834
835 if (S_ISDIR(smb_fname->st.st_ex_mode) && (unixmode & S_ISGID) &&
836 geteuid() != sec_initial_uid() &&
837 !current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
838 DEBUG(3,("file_set_dosmode: setgid bit cannot be "
839 "set for directory %s\n",
840 smb_fname_str_dbg(smb_fname)));
841 errno = EPERM;
842 return -1;
843 }
844
845 ret = SMB_VFS_CHMOD(conn, smb_fname->base_name, unixmode);
846 if (ret == 0) {
847 if(!newfile || (lret != -1)) {
848 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
849 FILE_NOTIFY_CHANGE_ATTRIBUTES,
850 smb_fname->base_name);
851 }
852 smb_fname->st.st_ex_mode = unixmode;
853 return 0;
854 }
855
856 if((errno != EPERM) && (errno != EACCES))
857 return -1;
858
859 if(!lp_dos_filemode(SNUM(conn)))
860 return -1;
861
862 /* We want DOS semantics, ie allow non owner with write permission to change the
863 bits on a file. Just like file_ntimes below.
864 */
865
866 if (!can_write_to_file(conn, smb_fname)) {
867 errno = EACCES;
868 return -1;
869 }
870
871 /*
872 * We need to open the file with write access whilst
873 * still in our current user context. This ensures we
874 * are not violating security in doing the fchmod.
875 */
876 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname,
877 &fsp)))
878 return -1;
879 become_root();
880 ret = SMB_VFS_FCHMOD(fsp, unixmode);
881 unbecome_root();
882 close_file(NULL, fsp, NORMAL_CLOSE);
883 if (!newfile) {
884 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
885 FILE_NOTIFY_CHANGE_ATTRIBUTES,
886 smb_fname->base_name);
887 }
888 if (ret == 0) {
889 smb_fname->st.st_ex_mode = unixmode;
890 }
891
892 return( ret );
893 }
894
895
896 NTSTATUS file_set_sparse(connection_struct *conn,
897 files_struct *fsp,
898 bool sparse)
899 {
900 uint32_t old_dosmode;
901 uint32_t new_dosmode;
902 NTSTATUS status;
903
904 if (!CAN_WRITE(conn)) {
905 DEBUG(9,("file_set_sparse: fname[%s] set[%u] "
906 "on readonly share[%s]\n",
907 smb_fname_str_dbg(fsp->fsp_name),
908 sparse,
909 lp_servicename(talloc_tos(), SNUM(conn))));
910 return NT_STATUS_MEDIA_WRITE_PROTECTED;
911 }
912
913 if (!(fsp->access_mask & FILE_WRITE_DATA) &&
914 !(fsp->access_mask & FILE_WRITE_ATTRIBUTES)) {
915 DEBUG(9,("file_set_sparse: fname[%s] set[%u] "
916 "access_mask[0x%08X] - access denied\n",
917 smb_fname_str_dbg(fsp->fsp_name),
918 sparse,
919 fsp->access_mask));
920 return NT_STATUS_ACCESS_DENIED;
921 }
922
923 DEBUG(10,("file_set_sparse: setting sparse bit %u on file %s\n",
924 sparse, smb_fname_str_dbg(fsp->fsp_name)));
925
926 if (!lp_store_dos_attributes(SNUM(conn))) {
927 return NT_STATUS_INVALID_DEVICE_REQUEST;
928 }
929
930 status = vfs_stat_fsp(fsp);
931 if (!NT_STATUS_IS_OK(status)) {
932 return status;
933 }
934
935 old_dosmode = dos_mode(conn, fsp->fsp_name);
936
937 if (sparse && !(old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
938 new_dosmode = old_dosmode | FILE_ATTRIBUTE_SPARSE;
939 } else if (!sparse && (old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
940 new_dosmode = old_dosmode & ~FILE_ATTRIBUTE_SPARSE;
941 } else {
942 return NT_STATUS_OK;
943 }
944
945 /* Store the DOS attributes in an EA. */
946 if (!set_ea_dos_attribute(conn, fsp->fsp_name,
947 new_dosmode)) {
948 if (errno == 0) {
949 errno = EIO;
950 }
951 return map_nt_error_from_unix(errno);
952 }
953
954 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
955 FILE_NOTIFY_CHANGE_ATTRIBUTES,
956 fsp->fsp_name->base_name);
957
958 fsp->is_sparse = sparse;
959
960 return NT_STATUS_OK;
961 }
962
963 /*******************************************************************
964 Wrapper around the VFS ntimes that possibly allows DOS semantics rather
965 than POSIX.
966 *******************************************************************/
967
968 int file_ntimes(connection_struct *conn, const struct smb_filename *smb_fname,
969 struct smb_file_time *ft)
970 {
971 int ret = -1;
972
973 errno = 0;
974
975 DEBUG(6, ("file_ntime: actime: %s",
976 time_to_asc(convert_timespec_to_time_t(ft->atime))));
977 DEBUG(6, ("file_ntime: modtime: %s",
978 time_to_asc(convert_timespec_to_time_t(ft->mtime))));
979 DEBUG(6, ("file_ntime: ctime: %s",
980 time_to_asc(convert_timespec_to_time_t(ft->ctime))));
981 DEBUG(6, ("file_ntime: createtime: %s",
982 time_to_asc(convert_timespec_to_time_t(ft->create_time))));
983
984 /* Don't update the time on read-only shares */
985 /* We need this as set_filetime (which can be called on
986 close and other paths) can end up calling this function
987 without the NEED_WRITE protection. Found by :
988 Leo Weppelman <leo@wau.mis.ah.nl>
989 */
990
991 if (!CAN_WRITE(conn)) {
992 return 0;
993 }
994
995 if(SMB_VFS_NTIMES(conn, smb_fname, ft) == 0) {
996 return 0;
997 }
998
999 if((errno != EPERM) && (errno != EACCES)) {
1000 return -1;
1001 }
1002
1003 if(!lp_dos_filetimes(SNUM(conn))) {
1004 return -1;
1005 }
1006
1007 /* We have permission (given by the Samba admin) to
1008 break POSIX semantics and allow a user to change
1009 the time on a file they don't own but can write to
1010 (as DOS does).
1011 */
1012
1013 /* Check if we have write access. */
1014 if (can_write_to_file(conn, smb_fname)) {
1015 /* We are allowed to become root and change the filetime. */
1016 become_root();
1017 ret = SMB_VFS_NTIMES(conn, smb_fname, ft);
1018 unbecome_root();
1019 }
1020
1021 return ret;
1022 }
1023
1024 /******************************************************************
1025 Force a "sticky" write time on a pathname. This will always be
1026 returned on all future write time queries and set on close.
1027 ******************************************************************/
1028
1029 bool set_sticky_write_time_path(struct file_id fileid, struct timespec mtime)
1030 {
1031 if (null_timespec(mtime)) {
1032 return true;
1033 }
1034
1035 if (!set_sticky_write_time(fileid, mtime)) {
1036 return false;
1037 }
1038
1039 return true;
1040 }
1041
1042 /******************************************************************
1043 Force a "sticky" write time on an fsp. This will always be
1044 returned on all future write time queries and set on close.
1045 ******************************************************************/
1046
1047 bool set_sticky_write_time_fsp(struct files_struct *fsp, struct timespec mtime)
1048 {
1049 if (null_timespec(mtime)) {
1050 return true;
1051 }
1052
1053 fsp->write_time_forced = true;
1054 TALLOC_FREE(fsp->update_write_time_event);
1055
1056 return set_sticky_write_time_path(fsp->file_id, mtime);
1057 }
1058
1059 /******************************************************************
1060 Set a create time EA.
1061 ******************************************************************/
1062
1063 NTSTATUS set_create_timespec_ea(connection_struct *conn,
1064 const struct smb_filename *psmb_fname,
1065 struct timespec create_time)
1066 {
1067 struct smb_filename *smb_fname;
1068 uint32_t dosmode;
1069 int ret;
1070
1071 if (!lp_store_dos_attributes(SNUM(conn))) {
1072 return NT_STATUS_OK;
1073 }
1074
1075 smb_fname = synthetic_smb_fname(talloc_tos(), psmb_fname->base_name,
1076 NULL, &psmb_fname->st);
1077
1078 if (smb_fname == NULL) {
1079 return NT_STATUS_NO_MEMORY;
1080 }
1081
1082 dosmode = dos_mode(conn, smb_fname);
1083
1084 smb_fname->st.st_ex_btime = create_time;
1085
1086 ret = file_set_dosmode(conn, smb_fname, dosmode, NULL, false);
1087 if (ret == -1) {
1088 map_nt_error_from_unix(errno);
1089 }
1090
1091 DEBUG(10,("set_create_timespec_ea: wrote create time EA for file %s\n",
1092 smb_fname_str_dbg(smb_fname)));
1093
1094 return NT_STATUS_OK;
1095 }
1096
1097 /******************************************************************
1098 Return a create time.
1099 ******************************************************************/
1100
1101 struct timespec get_create_timespec(connection_struct *conn,
1102 struct files_struct *fsp,
1103 const struct smb_filename *smb_fname)
1104 {
1105 return smb_fname->st.st_ex_btime;
1106 }
1107
1108 /******************************************************************
1109 Return a change time (may look at EA in future).
1110 ******************************************************************/
1111
1112 struct timespec get_change_timespec(connection_struct *conn,
1113 struct files_struct *fsp,
1114 const struct smb_filename *smb_fname)
1115 {
1116 return smb_fname->st.st_ex_mtime;
1117 }
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