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wb_samba3_cmd.c: Fix typo in comment.
[Samba.git] / source3 / smbd / dosmode.c
bloba98ac073f43be2616ce1d2ce80e6c06a9d28ed9d
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 = NULL;
88 NTSTATUS status;
89
90 DEBUG(2, ("unix_mode(%s) inheriting from %s\n",
91 smb_fname_str_dbg(smb_fname),
92 inherit_from_dir));
93
94 status = create_synthetic_smb_fname(talloc_tos(),
95 inherit_from_dir, NULL,
96 NULL, &smb_fname_parent);
97 if (!NT_STATUS_IS_OK(status)) {
98 DEBUG(1,("unix_mode(%s) failed, [dir %s]: %s\n",
99 smb_fname_str_dbg(smb_fname),
100 inherit_from_dir, nt_errstr(status)));
101 return(0);
102 }
103
104 if (SMB_VFS_STAT(conn, smb_fname_parent) != 0) {
105 DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",
106 smb_fname_str_dbg(smb_fname),
107 inherit_from_dir, strerror(errno)));
108 TALLOC_FREE(smb_fname_parent);
109 return(0); /* *** shouldn't happen! *** */
110 }
111
112 /* Save for later - but explicitly remove setuid bit for safety. */
113 dir_mode = smb_fname_parent->st.st_ex_mode & ~S_ISUID;
114 DEBUG(2,("unix_mode(%s) inherit mode %o\n",
115 smb_fname_str_dbg(smb_fname), (int)dir_mode));
116 /* Clear "result" */
117 result = 0;
118 TALLOC_FREE(smb_fname_parent);
119 }
120
121 if (IS_DOS_DIR(dosmode)) {
122 /* We never make directories read only for the owner as under DOS a user
123 can always create a file in a read-only directory. */
124 result |= (S_IFDIR | S_IWUSR);
125
126 if (dir_mode) {
127 /* Inherit mode of parent directory. */
128 result |= dir_mode;
129 } else {
130 /* Provisionally add all 'x' bits */
131 result |= (S_IXUSR | S_IXGRP | S_IXOTH);
132
133 /* Apply directory mask */
134 result &= lp_dir_mask(SNUM(conn));
135 /* Add in force bits */
136 result |= lp_force_dir_mode(SNUM(conn));
137 }
138 } else {
139 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
140 result |= S_IXUSR;
141
142 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
143 result |= S_IXGRP;
144
145 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
146 result |= S_IXOTH;
147
148 if (dir_mode) {
149 /* Inherit 666 component of parent directory mode */
150 result |= dir_mode & (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
151 } else {
152 /* Apply mode mask */
153 result &= lp_create_mask(SNUM(conn));
154 /* Add in force bits */
155 result |= lp_force_create_mode(SNUM(conn));
156 }
157 }
158
159 DEBUG(3,("unix_mode(%s) returning 0%o\n", smb_fname_str_dbg(smb_fname),
160 (int)result));
161 return(result);
162 }
163
164 /****************************************************************************
165 Change a unix mode to a dos mode.
166 ****************************************************************************/
167
168 static uint32 dos_mode_from_sbuf(connection_struct *conn,
169 const struct smb_filename *smb_fname)
170 {
171 int result = 0;
172 enum mapreadonly_options ro_opts = (enum mapreadonly_options)lp_map_readonly(SNUM(conn));
173
174 #if defined(UF_IMMUTABLE) && defined(SF_IMMUTABLE)
175 /* if we can find out if a file is immutable we should report it r/o */
176 if (smb_fname->st.st_ex_flags & (UF_IMMUTABLE | SF_IMMUTABLE)) {
177 result |= FILE_ATTRIBUTE_READONLY;
178 }
179 #endif
180 if (ro_opts == MAP_READONLY_YES) {
181 /* Original Samba method - map inverse of user "w" bit. */
182 if ((smb_fname->st.st_ex_mode & S_IWUSR) == 0) {
183 result |= FILE_ATTRIBUTE_READONLY;
184 }
185 } else if (ro_opts == MAP_READONLY_PERMISSIONS) {
186 /* Check actual permissions for read-only. */
187 if (!can_write_to_file(conn, smb_fname)) {
188 result |= FILE_ATTRIBUTE_READONLY;
189 }
190 } /* Else never set the readonly bit. */
191
192 if (MAP_ARCHIVE(conn) && ((smb_fname->st.st_ex_mode & S_IXUSR) != 0))
193 result |= FILE_ATTRIBUTE_ARCHIVE;
194
195 if (MAP_SYSTEM(conn) && ((smb_fname->st.st_ex_mode & S_IXGRP) != 0))
196 result |= FILE_ATTRIBUTE_SYSTEM;
197
198 if (MAP_HIDDEN(conn) && ((smb_fname->st.st_ex_mode & S_IXOTH) != 0))
199 result |= FILE_ATTRIBUTE_HIDDEN;
200
201 if (S_ISDIR(smb_fname->st.st_ex_mode))
202 result = FILE_ATTRIBUTE_DIRECTORY | (result & FILE_ATTRIBUTE_READONLY);
203
204 result |= set_link_read_only_flag(&smb_fname->st);
205
206 DEBUG(8,("dos_mode_from_sbuf returning "));
207
208 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
209 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
210 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
211 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
212 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
213
214 DEBUG(8,("\n"));
215 return result;
216 }
217
218 /****************************************************************************
219 Get DOS attributes from an EA.
220 This can also pull the create time into the stat struct inside smb_fname.
221 ****************************************************************************/
222
223 static bool get_ea_dos_attribute(connection_struct *conn,
224 struct smb_filename *smb_fname,
225 uint32 *pattr)
226 {
227 struct xattr_DOSATTRIB dosattrib;
228 enum ndr_err_code ndr_err;
229 DATA_BLOB blob;
230 ssize_t sizeret;
231 fstring attrstr;
232 uint32_t dosattr;
233
234 if (!lp_store_dos_attributes(SNUM(conn))) {
235 return False;
236 }
237
238 /* Don't reset pattr to zero as we may already have filename-based attributes we
239 need to preserve. */
240
241 sizeret = SMB_VFS_GETXATTR(conn, smb_fname->base_name,
242 SAMBA_XATTR_DOS_ATTRIB, attrstr,
243 sizeof(attrstr));
244 if (sizeret == -1) {
245 if (errno == ENOSYS
246 #if defined(ENOTSUP)
247 || errno == ENOTSUP) {
248 #else
249 ) {
250 #endif
251 DEBUG(1,("get_ea_dos_attribute: Cannot get attribute "
252 "from EA on file %s: Error = %s\n",
253 smb_fname_str_dbg(smb_fname),
254 strerror(errno)));
255 set_store_dos_attributes(SNUM(conn), False);
256 }
257 return False;
258 }
259
260 blob.data = (uint8_t *)attrstr;
261 blob.length = sizeret;
262
263 ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), &dosattrib,
264 (ndr_pull_flags_fn_t)ndr_pull_xattr_DOSATTRIB);
265
266 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
267 DEBUG(1,("get_ea_dos_attribute: bad ndr decode "
268 "from EA on file %s: Error = %s\n",
269 smb_fname_str_dbg(smb_fname),
270 ndr_errstr(ndr_err)));
271 return false;
272 }
273
274 DEBUG(10,("get_ea_dos_attribute: %s attr = %s\n",
275 smb_fname_str_dbg(smb_fname), dosattrib.attrib_hex));
276
277 switch (dosattrib.version) {
278 case 0xFFFF:
279 dosattr = dosattrib.info.compatinfoFFFF.attrib;
280 break;
281 case 1:
282 dosattr = dosattrib.info.info1.attrib;
283 if (!null_nttime(dosattrib.info.info1.create_time)) {
284 struct timespec create_time =
285 nt_time_to_unix_timespec(
286 &dosattrib.info.info1.create_time);
287
288 update_stat_ex_create_time(&smb_fname->st,
289 create_time);
290
291 DEBUG(10,("get_ea_dos_attribute: file %s case 1 "
292 "set btime %s\n",
293 smb_fname_str_dbg(smb_fname),
294 time_to_asc(convert_timespec_to_time_t(
295 create_time)) ));
296 }
297 break;
298 case 2:
299 dosattr = dosattrib.info.oldinfo2.attrib;
300 /* Don't know what flags to check for this case. */
301 break;
302 case 3:
303 dosattr = dosattrib.info.info3.attrib;
304 if ((dosattrib.info.info3.valid_flags & XATTR_DOSINFO_CREATE_TIME) &&
305 !null_nttime(dosattrib.info.info3.create_time)) {
306 struct timespec create_time =
307 nt_time_to_unix_timespec(
308 &dosattrib.info.info3.create_time);
309
310 update_stat_ex_create_time(&smb_fname->st,
311 create_time);
312
313 DEBUG(10,("get_ea_dos_attribute: file %s case 3 "
314 "set btime %s\n",
315 smb_fname_str_dbg(smb_fname),
316 time_to_asc(convert_timespec_to_time_t(
317 create_time)) ));
318 }
319 break;
320 default:
321 DEBUG(1,("get_ea_dos_attribute: Badly formed DOSATTRIB on "
322 "file %s - %s\n", smb_fname_str_dbg(smb_fname),
323 attrstr));
324 return false;
325 }
326
327 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
328 dosattr |= FILE_ATTRIBUTE_DIRECTORY;
329 }
330 /* FILE_ATTRIBUTE_SPARSE is valid on get but not on set. */
331 *pattr = (uint32)(dosattr & (SAMBA_ATTRIBUTES_MASK|FILE_ATTRIBUTE_SPARSE));
332
333 DEBUG(8,("get_ea_dos_attribute returning (0x%x)", dosattr));
334
335 if (dosattr & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
336 if (dosattr & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
337 if (dosattr & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
338 if (dosattr & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
339 if (dosattr & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
340
341 DEBUG(8,("\n"));
342
343 return True;
344 }
345
346 /****************************************************************************
347 Set DOS attributes in an EA.
348 Also sets the create time.
349 ****************************************************************************/
350
351 static bool set_ea_dos_attribute(connection_struct *conn,
352 struct smb_filename *smb_fname,
353 uint32 dosmode)
354 {
355 struct xattr_DOSATTRIB dosattrib;
356 enum ndr_err_code ndr_err;
357 DATA_BLOB blob;
358
359 if (!lp_store_dos_attributes(SNUM(conn))) {
360 return False;
361 }
362
363 ZERO_STRUCT(dosattrib);
364 ZERO_STRUCT(blob);
365
366 dosattrib.version = 3;
367 dosattrib.info.info3.valid_flags = XATTR_DOSINFO_ATTRIB|
368 XATTR_DOSINFO_CREATE_TIME;
369 dosattrib.info.info3.attrib = dosmode;
370 unix_timespec_to_nt_time(&dosattrib.info.info3.create_time,
371 smb_fname->st.st_ex_btime);
372
373 DEBUG(10,("set_ea_dos_attributes: set attribute 0x%x, btime = %s on file %s\n",
374 (unsigned int)dosmode,
375 time_to_asc(convert_timespec_to_time_t(smb_fname->st.st_ex_btime)),
376 smb_fname_str_dbg(smb_fname) ));
377
378 ndr_err = ndr_push_struct_blob(
379 &blob, talloc_tos(), &dosattrib,
380 (ndr_push_flags_fn_t)ndr_push_xattr_DOSATTRIB);
381
382 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
383 DEBUG(5, ("create_acl_blob: ndr_push_xattr_DOSATTRIB failed: %s\n",
384 ndr_errstr(ndr_err)));
385 return false;
386 }
387
388 if (blob.data == NULL || blob.length == 0) {
389 return false;
390 }
391
392 if (SMB_VFS_SETXATTR(conn, smb_fname->base_name,
393 SAMBA_XATTR_DOS_ATTRIB, blob.data, blob.length,
394 0) == -1) {
395 bool ret = false;
396 files_struct *fsp = NULL;
397
398 if((errno != EPERM) && (errno != EACCES)) {
399 if (errno == ENOSYS
400 #if defined(ENOTSUP)
401 || errno == ENOTSUP) {
402 #else
403 ) {
404 #endif
405 DEBUG(1,("set_ea_dos_attributes: Cannot set "
406 "attribute EA on file %s: Error = %s\n",
407 smb_fname_str_dbg(smb_fname),
408 strerror(errno) ));
409 set_store_dos_attributes(SNUM(conn), False);
410 }
411 return false;
412 }
413
414 /* We want DOS semantics, ie allow non owner with write permission to change the
415 bits on a file. Just like file_ntimes below.
416 */
417
418 /* Check if we have write access. */
419 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
420 return false;
421
422 /*
423 * We need to open the file with write access whilst
424 * still in our current user context. This ensures we
425 * are not violating security in doing the setxattr.
426 */
427
428 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname,
429 &fsp)))
430 return false;
431 become_root();
432 if (SMB_VFS_FSETXATTR(fsp,
433 SAMBA_XATTR_DOS_ATTRIB, blob.data,
434 blob.length, 0) == 0) {
435 ret = true;
436 }
437 unbecome_root();
438 close_file(NULL, fsp, NORMAL_CLOSE);
439 return ret;
440 }
441 DEBUG(10,("set_ea_dos_attribute: set EA 0x%x on file %s\n",
442 (unsigned int)dosmode,
443 smb_fname_str_dbg(smb_fname)));
444 return true;
445 }
446
447 /****************************************************************************
448 Change a unix mode to a dos mode for an ms dfs link.
449 ****************************************************************************/
450
451 uint32 dos_mode_msdfs(connection_struct *conn,
452 const struct smb_filename *smb_fname)
453 {
454 uint32 result = 0;
455
456 DEBUG(8,("dos_mode_msdfs: %s\n", smb_fname_str_dbg(smb_fname)));
457
458 if (!VALID_STAT(smb_fname->st)) {
459 return 0;
460 }
461
462 /* First do any modifications that depend on the path name. */
463 /* hide files with a name starting with a . */
464 if (lp_hide_dot_files(SNUM(conn))) {
465 const char *p = strrchr_m(smb_fname->base_name, '/');
466 if (p) {
467 p++;
468 } else {
469 p = smb_fname->base_name;
470 }
471
472 /* Only . and .. are not hidden. */
473 if (p[0] == '.' && !((p[1] == '\0') ||
474 (p[1] == '.' && p[2] == '\0'))) {
475 result |= FILE_ATTRIBUTE_HIDDEN;
476 }
477 }
478
479 result |= dos_mode_from_sbuf(conn, smb_fname);
480
481 /* Optimization : Only call is_hidden_path if it's not already
482 hidden. */
483 if (!(result & FILE_ATTRIBUTE_HIDDEN) &&
484 IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
485 result |= FILE_ATTRIBUTE_HIDDEN;
486 }
487
488 if (result == 0) {
489 result = FILE_ATTRIBUTE_NORMAL;
490 }
491
492 result = filter_mode_by_protocol(result);
493
494 DEBUG(8,("dos_mode_msdfs returning "));
495
496 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
497 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
498 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
499 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
500 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
501 if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
502
503 DEBUG(8,("\n"));
504
505 return(result);
506 }
507
508 #ifdef HAVE_STAT_DOS_FLAGS
509 /****************************************************************************
510 Convert dos attributes (FILE_ATTRIBUTE_*) to dos stat flags (UF_*)
511 ****************************************************************************/
512
513 int dos_attributes_to_stat_dos_flags(uint32_t dosmode)
514 {
515 uint32_t dos_stat_flags = 0;
516
517 if (dosmode & FILE_ATTRIBUTE_ARCHIVE)
518 dos_stat_flags |= UF_DOS_ARCHIVE;
519 if (dosmode & FILE_ATTRIBUTE_HIDDEN)
520 dos_stat_flags |= UF_DOS_HIDDEN;
521 if (dosmode & FILE_ATTRIBUTE_READONLY)
522 dos_stat_flags |= UF_DOS_RO;
523 if (dosmode & FILE_ATTRIBUTE_SYSTEM)
524 dos_stat_flags |= UF_DOS_SYSTEM;
525 if (dosmode & FILE_ATTRIBUTE_NONINDEXED)
526 dos_stat_flags |= UF_DOS_NOINDEX;
527
528 return dos_stat_flags;
529 }
530
531 /****************************************************************************
532 Gets DOS attributes, accessed via st_ex_flags in the stat struct.
533 ****************************************************************************/
534
535 static bool get_stat_dos_flags(connection_struct *conn,
536 const struct smb_filename *smb_fname,
537 uint32_t *dosmode)
538 {
539 SMB_ASSERT(VALID_STAT(smb_fname->st));
540 SMB_ASSERT(dosmode);
541
542 if (!lp_store_dos_attributes(SNUM(conn))) {
543 return false;
544 }
545
546 DEBUG(5, ("Getting stat dos attributes for %s.\n",
547 smb_fname_str_dbg(smb_fname)));
548
549 if (smb_fname->st.st_ex_flags & UF_DOS_ARCHIVE)
550 *dosmode |= FILE_ATTRIBUTE_ARCHIVE;
551 if (smb_fname->st.st_ex_flags & UF_DOS_HIDDEN)
552 *dosmode |= FILE_ATTRIBUTE_HIDDEN;
553 if (smb_fname->st.st_ex_flags & UF_DOS_RO)
554 *dosmode |= FILE_ATTRIBUTE_READONLY;
555 if (smb_fname->st.st_ex_flags & UF_DOS_SYSTEM)
556 *dosmode |= FILE_ATTRIBUTE_SYSTEM;
557 if (smb_fname->st.st_ex_flags & UF_DOS_NOINDEX)
558 *dosmode |= FILE_ATTRIBUTE_NONINDEXED;
559 if (smb_fname->st.st_ex_flags & FILE_ATTRIBUTE_SPARSE)
560 *dosmode |= FILE_ATTRIBUTE_SPARSE;
561 if (S_ISDIR(smb_fname->st.st_ex_mode))
562 *dosmode |= FILE_ATTRIBUTE_DIRECTORY;
563
564 *dosmode |= set_link_read_only_flag(&smb_fname->st);
565
566 return true;
567 }
568
569 /****************************************************************************
570 Sets DOS attributes, stored in st_ex_flags of the inode.
571 ****************************************************************************/
572
573 static bool set_stat_dos_flags(connection_struct *conn,
574 const struct smb_filename *smb_fname,
575 uint32_t dosmode,
576 bool *attributes_changed)
577 {
578 uint32_t new_flags = 0;
579 int error = 0;
580
581 SMB_ASSERT(VALID_STAT(smb_fname->st));
582 SMB_ASSERT(attributes_changed);
583
584 *attributes_changed = false;
585
586 if (!lp_store_dos_attributes(SNUM(conn))) {
587 return false;
588 }
589
590 DEBUG(5, ("Setting stat dos attributes for %s.\n",
591 smb_fname_str_dbg(smb_fname)));
592
593 new_flags = (smb_fname->st.st_ex_flags & ~UF_DOS_FLAGS) |
594 dos_attributes_to_stat_dos_flags(dosmode);
595
596 /* Return early if no flags changed. */
597 if (new_flags == smb_fname->st.st_ex_flags)
598 return true;
599
600 DEBUG(5, ("Setting stat dos attributes=0x%x, prev=0x%x\n", new_flags,
601 smb_fname->st.st_ex_flags));
602
603 /* Set new flags with chflags. */
604 error = SMB_VFS_CHFLAGS(conn, smb_fname->base_name, new_flags);
605 if (error) {
606 DEBUG(0, ("Failed setting new stat dos attributes (0x%x) on "
607 "file %s! errno=%d\n", new_flags,
608 smb_fname_str_dbg(smb_fname), errno));
609 return false;
610 }
611
612 *attributes_changed = true;
613 return true;
614 }
615 #endif /* HAVE_STAT_DOS_FLAGS */
616
617 /****************************************************************************
618 Change a unix mode to a dos mode.
619 May also read the create timespec into the stat struct in smb_fname
620 if "store dos attributes" is true.
621 ****************************************************************************/
622
623 uint32 dos_mode(connection_struct *conn, struct smb_filename *smb_fname)
624 {
625 uint32 result = 0;
626 bool offline, used_stat_dos_flags = false;
627
628 DEBUG(8,("dos_mode: %s\n", smb_fname_str_dbg(smb_fname)));
629
630 if (!VALID_STAT(smb_fname->st)) {
631 return 0;
632 }
633
634 /* First do any modifications that depend on the path name. */
635 /* hide files with a name starting with a . */
636 if (lp_hide_dot_files(SNUM(conn))) {
637 const char *p = strrchr_m(smb_fname->base_name,'/');
638 if (p) {
639 p++;
640 } else {
641 p = smb_fname->base_name;
642 }
643
644 /* Only . and .. are not hidden. */
645 if (p[0] == '.' && !((p[1] == '\0') ||
646 (p[1] == '.' && p[2] == '\0'))) {
647 result |= FILE_ATTRIBUTE_HIDDEN;
648 }
649 }
650
651 #ifdef HAVE_STAT_DOS_FLAGS
652 used_stat_dos_flags = get_stat_dos_flags(conn, smb_fname, &result);
653 #endif
654 if (!used_stat_dos_flags) {
655 /* Get the DOS attributes from an EA by preference. */
656 if (!get_ea_dos_attribute(conn, smb_fname, &result)) {
657 result |= dos_mode_from_sbuf(conn, smb_fname);
658 }
659 }
660
661 offline = SMB_VFS_IS_OFFLINE(conn, smb_fname, &smb_fname->st);
662 if (S_ISREG(smb_fname->st.st_ex_mode) && offline) {
663 result |= FILE_ATTRIBUTE_OFFLINE;
664 }
665
666 /* Optimization : Only call is_hidden_path if it's not already
667 hidden. */
668 if (!(result & FILE_ATTRIBUTE_HIDDEN) &&
669 IS_HIDDEN_PATH(conn, smb_fname->base_name)) {
670 result |= FILE_ATTRIBUTE_HIDDEN;
671 }
672
673 if (result == 0) {
674 result = FILE_ATTRIBUTE_NORMAL;
675 }
676
677 result = filter_mode_by_protocol(result);
678
679 DEBUG(8,("dos_mode returning "));
680
681 if (result & FILE_ATTRIBUTE_HIDDEN) DEBUG(8, ("h"));
682 if (result & FILE_ATTRIBUTE_READONLY ) DEBUG(8, ("r"));
683 if (result & FILE_ATTRIBUTE_SYSTEM) DEBUG(8, ("s"));
684 if (result & FILE_ATTRIBUTE_DIRECTORY ) DEBUG(8, ("d"));
685 if (result & FILE_ATTRIBUTE_ARCHIVE ) DEBUG(8, ("a"));
686 if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
687 if (result & FILE_ATTRIBUTE_OFFLINE ) DEBUG(8, ("[offline]"));
688
689 DEBUG(8,("\n"));
690
691 return(result);
692 }
693
694 /*******************************************************************
695 chmod a file - but preserve some bits.
696 If "store dos attributes" is also set it will store the create time
697 from the stat struct in smb_fname (in NTTIME format) in the EA
698 attribute also.
699 ********************************************************************/
700
701 int file_set_dosmode(connection_struct *conn, struct smb_filename *smb_fname,
702 uint32 dosmode, const char *parent_dir, bool newfile)
703 {
704 int mask=0;
705 mode_t tmp;
706 mode_t unixmode;
707 int ret = -1, lret = -1;
708 uint32_t old_mode;
709 struct timespec new_create_timespec;
710
711 /* We only allow READONLY|HIDDEN|SYSTEM|DIRECTORY|ARCHIVE here. */
712 dosmode &= (SAMBA_ATTRIBUTES_MASK | FILE_ATTRIBUTE_OFFLINE);
713
714 DEBUG(10,("file_set_dosmode: setting dos mode 0x%x on file %s\n",
715 dosmode, smb_fname_str_dbg(smb_fname)));
716
717 unixmode = smb_fname->st.st_ex_mode;
718
719 get_acl_group_bits(conn, smb_fname->base_name,
720 &smb_fname->st.st_ex_mode);
721
722 if (S_ISDIR(smb_fname->st.st_ex_mode))
723 dosmode |= FILE_ATTRIBUTE_DIRECTORY;
724 else
725 dosmode &= ~FILE_ATTRIBUTE_DIRECTORY;
726
727 new_create_timespec = smb_fname->st.st_ex_btime;
728
729 old_mode = dos_mode(conn, smb_fname);
730
731 if (dosmode & FILE_ATTRIBUTE_OFFLINE) {
732 if (!(old_mode & FILE_ATTRIBUTE_OFFLINE)) {
733 lret = SMB_VFS_SET_OFFLINE(conn, smb_fname);
734 if (lret == -1) {
735 DEBUG(0, ("set_dos_mode: client has asked to "
736 "set FILE_ATTRIBUTE_OFFLINE to "
737 "%s/%s but there was an error while "
738 "setting it or it is not "
739 "supported.\n", parent_dir,
740 smb_fname_str_dbg(smb_fname)));
741 }
742 }
743 }
744
745 dosmode &= ~FILE_ATTRIBUTE_OFFLINE;
746 old_mode &= ~FILE_ATTRIBUTE_OFFLINE;
747
748 smb_fname->st.st_ex_btime = new_create_timespec;
749
750 #ifdef HAVE_STAT_DOS_FLAGS
751 {
752 bool attributes_changed;
753
754 if (set_stat_dos_flags(conn, smb_fname, dosmode,
755 &attributes_changed))
756 {
757 if (!newfile && attributes_changed) {
758 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
759 FILE_NOTIFY_CHANGE_ATTRIBUTES,
760 smb_fname->base_name);
761 }
762 smb_fname->st.st_ex_mode = unixmode;
763 return 0;
764 }
765 }
766 #endif
767 /* Store the DOS attributes in an EA by preference. */
768 if (set_ea_dos_attribute(conn, smb_fname, dosmode)) {
769 if (!newfile) {
770 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
771 FILE_NOTIFY_CHANGE_ATTRIBUTES,
772 smb_fname->base_name);
773 }
774 smb_fname->st.st_ex_mode = unixmode;
775 return 0;
776 }
777
778 unixmode = unix_mode(conn, dosmode, smb_fname, parent_dir);
779
780 /* preserve the s bits */
781 mask |= (S_ISUID | S_ISGID);
782
783 /* preserve the t bit */
784 #ifdef S_ISVTX
785 mask |= S_ISVTX;
786 #endif
787
788 /* possibly preserve the x bits */
789 if (!MAP_ARCHIVE(conn))
790 mask |= S_IXUSR;
791 if (!MAP_SYSTEM(conn))
792 mask |= S_IXGRP;
793 if (!MAP_HIDDEN(conn))
794 mask |= S_IXOTH;
795
796 unixmode |= (smb_fname->st.st_ex_mode & mask);
797
798 /* if we previously had any r bits set then leave them alone */
799 if ((tmp = smb_fname->st.st_ex_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
800 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
801 unixmode |= tmp;
802 }
803
804 /* if we previously had any w bits set then leave them alone
805 whilst adding in the new w bits, if the new mode is not rdonly */
806 if (!IS_DOS_READONLY(dosmode)) {
807 unixmode |= (smb_fname->st.st_ex_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
808 }
809
810 /*
811 * From the chmod 2 man page:
812 *
813 * "If the calling process is not privileged, and the group of the file
814 * does not match the effective group ID of the process or one of its
815 * supplementary group IDs, the S_ISGID bit will be turned off, but
816 * this will not cause an error to be returned."
817 *
818 * Simply refuse to do the chmod in this case.
819 */
820
821 if (S_ISDIR(smb_fname->st.st_ex_mode) && (unixmode & S_ISGID) &&
822 geteuid() != sec_initial_uid() &&
823 !current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
824 DEBUG(3,("file_set_dosmode: setgid bit cannot be "
825 "set for directory %s\n",
826 smb_fname_str_dbg(smb_fname)));
827 errno = EPERM;
828 return -1;
829 }
830
831 ret = SMB_VFS_CHMOD(conn, smb_fname->base_name, unixmode);
832 if (ret == 0) {
833 if(!newfile || (lret != -1)) {
834 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
835 FILE_NOTIFY_CHANGE_ATTRIBUTES,
836 smb_fname->base_name);
837 }
838 smb_fname->st.st_ex_mode = unixmode;
839 return 0;
840 }
841
842 if((errno != EPERM) && (errno != EACCES))
843 return -1;
844
845 if(!lp_dos_filemode(SNUM(conn)))
846 return -1;
847
848 /* We want DOS semantics, ie allow non owner with write permission to change the
849 bits on a file. Just like file_ntimes below.
850 */
851
852 /* Check if we have write access. */
853 if (CAN_WRITE(conn)) {
854 /*
855 * We need to open the file with write access whilst
856 * still in our current user context. This ensures we
857 * are not violating security in doing the fchmod.
858 */
859 files_struct *fsp;
860 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname,
861 &fsp)))
862 return -1;
863 become_root();
864 ret = SMB_VFS_FCHMOD(fsp, unixmode);
865 unbecome_root();
866 close_file(NULL, fsp, NORMAL_CLOSE);
867 if (!newfile) {
868 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
869 FILE_NOTIFY_CHANGE_ATTRIBUTES,
870 smb_fname->base_name);
871 }
872 if (ret == 0) {
873 smb_fname->st.st_ex_mode = unixmode;
874 }
875 }
876
877 return( ret );
878 }
879
880
881 NTSTATUS file_set_sparse(connection_struct *conn,
882 files_struct *fsp,
883 bool sparse)
884 {
885 uint32_t old_dosmode;
886 uint32_t new_dosmode;
887 NTSTATUS status;
888
889 if (!CAN_WRITE(conn)) {
890 DEBUG(9,("file_set_sparse: fname[%s] set[%u] "
891 "on readonly share[%s]\n",
892 smb_fname_str_dbg(fsp->fsp_name),
893 sparse,
894 lp_servicename(talloc_tos(), SNUM(conn))));
895 return NT_STATUS_MEDIA_WRITE_PROTECTED;
896 }
897
898 if (!(fsp->access_mask & FILE_WRITE_DATA) &&
899 !(fsp->access_mask & FILE_WRITE_ATTRIBUTES)) {
900 DEBUG(9,("file_set_sparse: fname[%s] set[%u] "
901 "access_mask[0x%08X] - access denied\n",
902 smb_fname_str_dbg(fsp->fsp_name),
903 sparse,
904 fsp->access_mask));
905 return NT_STATUS_ACCESS_DENIED;
906 }
907
908 DEBUG(10,("file_set_sparse: setting sparse bit %u on file %s\n",
909 sparse, smb_fname_str_dbg(fsp->fsp_name)));
910
911 if (!lp_store_dos_attributes(SNUM(conn))) {
912 return NT_STATUS_INVALID_DEVICE_REQUEST;
913 }
914
915 status = vfs_stat_fsp(fsp);
916 if (!NT_STATUS_IS_OK(status)) {
917 return status;
918 }
919
920 old_dosmode = dos_mode(conn, fsp->fsp_name);
921
922 if (sparse && !(old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
923 new_dosmode = old_dosmode | FILE_ATTRIBUTE_SPARSE;
924 } else if (!sparse && (old_dosmode & FILE_ATTRIBUTE_SPARSE)) {
925 new_dosmode = old_dosmode & ~FILE_ATTRIBUTE_SPARSE;
926 } else {
927 return NT_STATUS_OK;
928 }
929
930 /* Store the DOS attributes in an EA. */
931 if (!set_ea_dos_attribute(conn, fsp->fsp_name,
932 new_dosmode)) {
933 if (errno == 0) {
934 errno = EIO;
935 }
936 return map_nt_error_from_unix(errno);
937 }
938
939 notify_fname(conn, NOTIFY_ACTION_MODIFIED,
940 FILE_NOTIFY_CHANGE_ATTRIBUTES,
941 fsp->fsp_name->base_name);
942
943 fsp->is_sparse = sparse;
944
945 return NT_STATUS_OK;
946 }
947
948 /*******************************************************************
949 Wrapper around the VFS ntimes that possibly allows DOS semantics rather
950 than POSIX.
951 *******************************************************************/
952
953 int file_ntimes(connection_struct *conn, const struct smb_filename *smb_fname,
954 struct smb_file_time *ft)
955 {
956 int ret = -1;
957
958 errno = 0;
959
960 DEBUG(6, ("file_ntime: actime: %s",
961 time_to_asc(convert_timespec_to_time_t(ft->atime))));
962 DEBUG(6, ("file_ntime: modtime: %s",
963 time_to_asc(convert_timespec_to_time_t(ft->mtime))));
964 DEBUG(6, ("file_ntime: ctime: %s",
965 time_to_asc(convert_timespec_to_time_t(ft->ctime))));
966 DEBUG(6, ("file_ntime: createtime: %s",
967 time_to_asc(convert_timespec_to_time_t(ft->create_time))));
968
969 /* Don't update the time on read-only shares */
970 /* We need this as set_filetime (which can be called on
971 close and other paths) can end up calling this function
972 without the NEED_WRITE protection. Found by :
973 Leo Weppelman <leo@wau.mis.ah.nl>
974 */
975
976 if (!CAN_WRITE(conn)) {
977 return 0;
978 }
979
980 if(SMB_VFS_NTIMES(conn, smb_fname, ft) == 0) {
981 return 0;
982 }
983
984 if((errno != EPERM) && (errno != EACCES)) {
985 return -1;
986 }
987
988 if(!lp_dos_filetimes(SNUM(conn))) {
989 return -1;
990 }
991
992 /* We have permission (given by the Samba admin) to
993 break POSIX semantics and allow a user to change
994 the time on a file they don't own but can write to
995 (as DOS does).
996 */
997
998 /* Check if we have write access. */
999 if (can_write_to_file(conn, smb_fname)) {
1000 /* We are allowed to become root and change the filetime. */
1001 become_root();
1002 ret = SMB_VFS_NTIMES(conn, smb_fname, ft);
1003 unbecome_root();
1004 }
1005
1006 return ret;
1007 }
1008
1009 /******************************************************************
1010 Force a "sticky" write time on a pathname. This will always be
1011 returned on all future write time queries and set on close.
1012 ******************************************************************/
1013
1014 bool set_sticky_write_time_path(struct file_id fileid, struct timespec mtime)
1015 {
1016 if (null_timespec(mtime)) {
1017 return true;
1018 }
1019
1020 if (!set_sticky_write_time(fileid, mtime)) {
1021 return false;
1022 }
1023
1024 return true;
1025 }
1026
1027 /******************************************************************
1028 Force a "sticky" write time on an fsp. This will always be
1029 returned on all future write time queries and set on close.
1030 ******************************************************************/
1031
1032 bool set_sticky_write_time_fsp(struct files_struct *fsp, struct timespec mtime)
1033 {
1034 if (null_timespec(mtime)) {
1035 return true;
1036 }
1037
1038 fsp->write_time_forced = true;
1039 TALLOC_FREE(fsp->update_write_time_event);
1040
1041 return set_sticky_write_time_path(fsp->file_id, mtime);
1042 }
1043
1044 /******************************************************************
1045 Set a create time EA.
1046 ******************************************************************/
1047
1048 NTSTATUS set_create_timespec_ea(connection_struct *conn,
1049 const struct smb_filename *psmb_fname,
1050 struct timespec create_time)
1051 {
1052 NTSTATUS status;
1053 struct smb_filename *smb_fname = NULL;
1054 uint32_t dosmode;
1055 int ret;
1056
1057 if (!lp_store_dos_attributes(SNUM(conn))) {
1058 return NT_STATUS_OK;
1059 }
1060
1061 status = create_synthetic_smb_fname(talloc_tos(),
1062 psmb_fname->base_name,
1063 NULL, &psmb_fname->st,
1064 &smb_fname);
1065
1066 if (!NT_STATUS_IS_OK(status)) {
1067 return status;
1068 }
1069
1070 dosmode = dos_mode(conn, smb_fname);
1071
1072 smb_fname->st.st_ex_btime = create_time;
1073
1074 ret = file_set_dosmode(conn, smb_fname, dosmode, NULL, false);
1075 if (ret == -1) {
1076 map_nt_error_from_unix(errno);
1077 }
1078
1079 DEBUG(10,("set_create_timespec_ea: wrote create time EA for file %s\n",
1080 smb_fname_str_dbg(smb_fname)));
1081
1082 return NT_STATUS_OK;
1083 }
1084
1085 /******************************************************************
1086 Return a create time.
1087 ******************************************************************/
1088
1089 struct timespec get_create_timespec(connection_struct *conn,
1090 struct files_struct *fsp,
1091 const struct smb_filename *smb_fname)
1092 {
1093 return smb_fname->st.st_ex_btime;
1094 }
1095
1096 /******************************************************************
1097 Return a change time (may look at EA in future).
1098 ******************************************************************/
1099
1100 struct timespec get_change_timespec(connection_struct *conn,
1101 struct files_struct *fsp,
1102 const struct smb_filename *smb_fname)
1103 {
1104 return smb_fname->st.st_ex_mtime;
1105 }
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