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s3:smbd: split out smbd_do_qfsinfo() from call_trans2qfsinfo()
[Samba/fernandojvsilva.git] / source3 / smbd / posix_acls.c
blob76eee9b56aa560bf8566248cc04ed2455b3ee14f
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern const struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 uint8_t ace_flags; /* From windows ACE entry. */
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk - version 1.
59 * All values are little endian.
60 *
61 * | 1 | 1 | 2 | 2 | ....
62 * +------+------+-------------+---------------------+-------------+--------------------+
63 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 *
66 * Entry format is :
67 *
68 * | 1 | 4 |
69 * +------+-------------------+
70 * | value| uid/gid or world |
71 * | type | value |
72 * +------+-------------------+
73 *
74 * Version 2 format. Stores extra Windows metadata about an ACL.
75 *
76 * | 1 | 2 | 2 | 2 | ....
77 * +------+----------+-------------+---------------------+-------------+--------------------+
78 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
79 * | 2 | type | | | | |
80 * +------+----------+-------------+---------------------+-------------+--------------------+
81 *
82 * Entry format is :
83 *
84 * | 1 | 1 | 4 |
85 * +------+------+-------------------+
86 * | ace | value| uid/gid or world |
87 * | flag | type | value |
88 * +------+-------------------+------+
89 *
90 */
91
92 #define PAI_VERSION_OFFSET 0
93
94 #define PAI_V1_FLAG_OFFSET 1
95 #define PAI_V1_NUM_ENTRIES_OFFSET 2
96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97 #define PAI_V1_ENTRIES_BASE 6
98 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
99 #define PAI_V1_ENTRY_LENGTH 5
100
101 #define PAI_V1_VERSION 1
102
103 #define PAI_V2_TYPE_OFFSET 1
104 #define PAI_V2_NUM_ENTRIES_OFFSET 3
105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106 #define PAI_V2_ENTRIES_BASE 7
107 #define PAI_V2_ENTRY_LENGTH 6
108
109 #define PAI_V2_VERSION 2
110
111 /*
112 * In memory format of user.SAMBA_PAI attribute.
113 */
114
115 struct pai_entry {
116 struct pai_entry *next, *prev;
117 uint8_t ace_flags;
118 enum ace_owner owner_type;
119 posix_id unix_ug;
120 };
121
122 struct pai_val {
123 uint16_t sd_type;
124 unsigned int num_entries;
125 struct pai_entry *entry_list;
126 unsigned int num_def_entries;
127 struct pai_entry *def_entry_list;
128 };
129
130 /************************************************************************
131 Return a uint32 of the pai_entry principal.
132 ************************************************************************/
133
134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
135 {
136 switch (paie->owner_type) {
137 case UID_ACE:
138 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139 return (uint32_t)paie->unix_ug.uid;
140 case GID_ACE:
141 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142 return (uint32_t)paie->unix_ug.gid;
143 case WORLD_ACE:
144 default:
145 DEBUG(10,("get_pai_entry_val: world ace\n"));
146 return (uint32_t)-1;
147 }
148 }
149
150 /************************************************************************
151 Return a uint32 of the entry principal.
152 ************************************************************************/
153
154 static uint32_t get_entry_val(canon_ace *ace_entry)
155 {
156 switch (ace_entry->owner_type) {
157 case UID_ACE:
158 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159 return (uint32_t)ace_entry->unix_ug.uid;
160 case GID_ACE:
161 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162 return (uint32_t)ace_entry->unix_ug.gid;
163 case WORLD_ACE:
164 default:
165 DEBUG(10,("get_entry_val: world ace\n"));
166 return (uint32_t)-1;
167 }
168 }
169
170 /************************************************************************
171 Create the on-disk format (always v2 now). Caller must free.
172 ************************************************************************/
173
174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
175 canon_ace *dir_ace_list,
176 uint16_t sd_type,
177 size_t *store_size)
178 {
179 char *pai_buf = NULL;
180 canon_ace *ace_list = NULL;
181 char *entry_offset = NULL;
182 unsigned int num_entries = 0;
183 unsigned int num_def_entries = 0;
184
185 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
186 num_entries++;
187 }
188
189 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
190 num_def_entries++;
191 }
192
193 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
194
195 *store_size = PAI_V2_ENTRIES_BASE +
196 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
197
198 pai_buf = (char *)SMB_MALLOC(*store_size);
199 if (!pai_buf) {
200 return NULL;
201 }
202
203 /* Set up the header. */
204 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
205 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
206 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
207 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
208 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
209
210 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
211
212 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
213 uint8_t type_val = (uint8_t)ace_list->owner_type;
214 uint32_t entry_val = get_entry_val(ace_list);
215
216 SCVAL(entry_offset,0,ace_list->ace_flags);
217 SCVAL(entry_offset,1,type_val);
218 SIVAL(entry_offset,2,entry_val);
219 entry_offset += PAI_V2_ENTRY_LENGTH;
220 }
221
222 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
223 uint8_t type_val = (uint8_t)ace_list->owner_type;
224 uint32_t entry_val = get_entry_val(ace_list);
225
226 SCVAL(entry_offset,0,ace_list->ace_flags);
227 SCVAL(entry_offset,1,type_val);
228 SIVAL(entry_offset,2,entry_val);
229 entry_offset += PAI_V2_ENTRY_LENGTH;
230 }
231
232 return pai_buf;
233 }
234
235 /************************************************************************
236 Store the user.SAMBA_PAI attribute on disk.
237 ************************************************************************/
238
239 static void store_inheritance_attributes(files_struct *fsp,
240 canon_ace *file_ace_list,
241 canon_ace *dir_ace_list,
242 uint16_t sd_type)
243 {
244 int ret;
245 size_t store_size;
246 char *pai_buf;
247
248 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
249 return;
250 }
251
252 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
253 sd_type, &store_size);
254
255 if (fsp->fh->fd != -1) {
256 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
257 pai_buf, store_size, 0);
258 } else {
259 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
260 pai_buf, store_size, 0);
261 }
262
263 SAFE_FREE(pai_buf);
264
265 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
266 (unsigned int)sd_type,
267 fsp->fsp_name));
268
269 if (ret == -1 && !no_acl_syscall_error(errno)) {
270 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
271 }
272 }
273
274 /************************************************************************
275 Delete the in memory inheritance info.
276 ************************************************************************/
277
278 static void free_inherited_info(struct pai_val *pal)
279 {
280 if (pal) {
281 struct pai_entry *paie, *paie_next;
282 for (paie = pal->entry_list; paie; paie = paie_next) {
283 paie_next = paie->next;
284 SAFE_FREE(paie);
285 }
286 for (paie = pal->def_entry_list; paie; paie = paie_next) {
287 paie_next = paie->next;
288 SAFE_FREE(paie);
289 }
290 SAFE_FREE(pal);
291 }
292 }
293
294 /************************************************************************
295 Get any stored ACE flags.
296 ************************************************************************/
297
298 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
299 {
300 struct pai_entry *paie;
301
302 if (!pal) {
303 return 0;
304 }
305
306 /* If the entry exists it is inherited. */
307 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
308 if (ace_entry->owner_type == paie->owner_type &&
309 get_entry_val(ace_entry) == get_pai_entry_val(paie))
310 return paie->ace_flags;
311 }
312 return 0;
313 }
314
315 /************************************************************************
316 Ensure an attribute just read is valid - v1.
317 ************************************************************************/
318
319 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
320 {
321 uint16 num_entries;
322 uint16 num_def_entries;
323
324 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
325 /* Corrupted - too small. */
326 return false;
327 }
328
329 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
330 return false;
331 }
332
333 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
334 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
335
336 /* Check the entry lists match. */
337 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
338
339 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
340 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
341 return false;
342 }
343
344 return true;
345 }
346
347 /************************************************************************
348 Ensure an attribute just read is valid - v2.
349 ************************************************************************/
350
351 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
352 {
353 uint16 num_entries;
354 uint16 num_def_entries;
355
356 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
357 /* Corrupted - too small. */
358 return false;
359 }
360
361 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
362 return false;
363 }
364
365 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
366 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
367
368 /* Check the entry lists match. */
369 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
370
371 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
372 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
373 return false;
374 }
375
376 return true;
377 }
378
379 /************************************************************************
380 Decode the owner.
381 ************************************************************************/
382
383 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
384 {
385 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
386 switch( paie->owner_type) {
387 case UID_ACE:
388 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
389 DEBUG(10,("get_pai_owner_type: uid = %u\n",
390 (unsigned int)paie->unix_ug.uid ));
391 break;
392 case GID_ACE:
393 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
394 DEBUG(10,("get_pai_owner_type: gid = %u\n",
395 (unsigned int)paie->unix_ug.gid ));
396 break;
397 case WORLD_ACE:
398 paie->unix_ug.world = -1;
399 DEBUG(10,("get_pai_owner_type: world ace\n"));
400 break;
401 default:
402 return false;
403 }
404 return true;
405 }
406
407 /************************************************************************
408 Process v2 entries.
409 ************************************************************************/
410
411 static const char *create_pai_v1_entries(struct pai_val *paiv,
412 const char *entry_offset,
413 bool def_entry)
414 {
415 int i;
416
417 for (i = 0; i < paiv->num_entries; i++) {
418 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
419 if (!paie) {
420 return NULL;
421 }
422
423 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
424 if (!get_pai_owner_type(paie, entry_offset)) {
425 return NULL;
426 }
427
428 if (!def_entry) {
429 DLIST_ADD(paiv->entry_list, paie);
430 } else {
431 DLIST_ADD(paiv->def_entry_list, paie);
432 }
433 entry_offset += PAI_V1_ENTRY_LENGTH;
434 }
435 return entry_offset;
436 }
437
438 /************************************************************************
439 Convert to in-memory format from version 1.
440 ************************************************************************/
441
442 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
443 {
444 const char *entry_offset;
445 struct pai_val *paiv = NULL;
446
447 if (!check_pai_ok_v1(buf, size)) {
448 return NULL;
449 }
450
451 paiv = SMB_MALLOC_P(struct pai_val);
452 if (!paiv) {
453 return NULL;
454 }
455
456 memset(paiv, '\0', sizeof(struct pai_val));
457
458 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
459 SE_DESC_DACL_PROTECTED : 0;
460
461 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
462 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
463
464 entry_offset = buf + PAI_V1_ENTRIES_BASE;
465
466 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
467 paiv->num_entries, paiv->num_def_entries ));
468
469 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
470 if (entry_offset == NULL) {
471 free_inherited_info(paiv);
472 return NULL;
473 }
474 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
475 if (entry_offset == NULL) {
476 free_inherited_info(paiv);
477 return NULL;
478 }
479
480 return paiv;
481 }
482
483 /************************************************************************
484 Process v2 entries.
485 ************************************************************************/
486
487 static const char *create_pai_v2_entries(struct pai_val *paiv,
488 const char *entry_offset,
489 bool def_entry)
490 {
491 int i;
492
493 for (i = 0; i < paiv->num_entries; i++) {
494 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
495 if (!paie) {
496 return NULL;
497 }
498
499 paie->ace_flags = CVAL(entry_offset,0);
500
501 entry_offset++;
502
503 if (!get_pai_owner_type(paie, entry_offset)) {
504 return NULL;
505 }
506 if (!def_entry) {
507 DLIST_ADD(paiv->entry_list, paie);
508 } else {
509 DLIST_ADD(paiv->def_entry_list, paie);
510 }
511 entry_offset += PAI_V2_ENTRY_LENGTH;
512 }
513 return entry_offset;
514 }
515
516 /************************************************************************
517 Convert to in-memory format from version 2.
518 ************************************************************************/
519
520 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
521 {
522 const char *entry_offset;
523 struct pai_val *paiv = NULL;
524
525 if (!check_pai_ok_v2(buf, size)) {
526 return NULL;
527 }
528
529 paiv = SMB_MALLOC_P(struct pai_val);
530 if (!paiv) {
531 return NULL;
532 }
533
534 memset(paiv, '\0', sizeof(struct pai_val));
535
536 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
537
538 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
539 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
540
541 entry_offset = buf + PAI_V2_ENTRIES_BASE;
542
543 DEBUG(10,("create_pai_val_v2: num_entries = %u, num_def_entries = %u\n",
544 paiv->num_entries, paiv->num_def_entries ));
545
546 entry_offset = create_pai_v2_entries(paiv, entry_offset, false);
547 if (entry_offset == NULL) {
548 free_inherited_info(paiv);
549 return NULL;
550 }
551 entry_offset = create_pai_v2_entries(paiv, entry_offset, true);
552 if (entry_offset == NULL) {
553 free_inherited_info(paiv);
554 return NULL;
555 }
556
557 return paiv;
558 }
559
560 /************************************************************************
561 Convert to in-memory format - from either version 1 or 2.
562 ************************************************************************/
563
564 static struct pai_val *create_pai_val(const char *buf, size_t size)
565 {
566 if (size < 1) {
567 return NULL;
568 }
569 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
570 return create_pai_val_v1(buf, size);
571 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
572 return create_pai_val_v2(buf, size);
573 } else {
574 return NULL;
575 }
576 }
577
578 /************************************************************************
579 Load the user.SAMBA_PAI attribute.
580 ************************************************************************/
581
582 static struct pai_val *fload_inherited_info(files_struct *fsp)
583 {
584 char *pai_buf;
585 size_t pai_buf_size = 1024;
586 struct pai_val *paiv = NULL;
587 ssize_t ret;
588
589 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
590 return NULL;
591 }
592
593 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
594 return NULL;
595 }
596
597 do {
598 if (fsp->fh->fd != -1) {
599 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
600 pai_buf, pai_buf_size);
601 } else {
602 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
603 pai_buf, pai_buf_size);
604 }
605
606 if (ret == -1) {
607 if (errno != ERANGE) {
608 break;
609 }
610 /* Buffer too small - enlarge it. */
611 pai_buf_size *= 2;
612 SAFE_FREE(pai_buf);
613 if (pai_buf_size > 1024*1024) {
614 return NULL; /* Limit malloc to 1mb. */
615 }
616 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
617 return NULL;
618 }
619 } while (ret == -1);
620
621 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
622
623 if (ret == -1) {
624 /* No attribute or not supported. */
625 #if defined(ENOATTR)
626 if (errno != ENOATTR)
627 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
628 #else
629 if (errno != ENOSYS)
630 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
631 #endif
632 SAFE_FREE(pai_buf);
633 return NULL;
634 }
635
636 paiv = create_pai_val(pai_buf, ret);
637
638 if (paiv) {
639 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
640 (unsigned int)paiv->sd_type,
641 fsp->fsp_name));
642 }
643
644 SAFE_FREE(pai_buf);
645 return paiv;
646 }
647
648 /************************************************************************
649 Load the user.SAMBA_PAI attribute.
650 ************************************************************************/
651
652 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
653 const char *fname)
654 {
655 char *pai_buf;
656 size_t pai_buf_size = 1024;
657 struct pai_val *paiv = NULL;
658 ssize_t ret;
659
660 if (!lp_map_acl_inherit(SNUM(conn))) {
661 return NULL;
662 }
663
664 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
665 return NULL;
666 }
667
668 do {
669 ret = SMB_VFS_GETXATTR(conn, fname,
670 SAMBA_POSIX_INHERITANCE_EA_NAME,
671 pai_buf, pai_buf_size);
672
673 if (ret == -1) {
674 if (errno != ERANGE) {
675 break;
676 }
677 /* Buffer too small - enlarge it. */
678 pai_buf_size *= 2;
679 SAFE_FREE(pai_buf);
680 if (pai_buf_size > 1024*1024) {
681 return NULL; /* Limit malloc to 1mb. */
682 }
683 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
684 return NULL;
685 }
686 } while (ret == -1);
687
688 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
689
690 if (ret == -1) {
691 /* No attribute or not supported. */
692 #if defined(ENOATTR)
693 if (errno != ENOATTR)
694 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
695 #else
696 if (errno != ENOSYS)
697 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
698 #endif
699 SAFE_FREE(pai_buf);
700 return NULL;
701 }
702
703 paiv = create_pai_val(pai_buf, ret);
704
705 if (paiv) {
706 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
707 (unsigned int)paiv->sd_type,
708 fname));
709 }
710
711 SAFE_FREE(pai_buf);
712 return paiv;
713 }
714
715 /****************************************************************************
716 Functions to manipulate the internal ACE format.
717 ****************************************************************************/
718
719 /****************************************************************************
720 Count a linked list of canonical ACE entries.
721 ****************************************************************************/
722
723 static size_t count_canon_ace_list( canon_ace *l_head )
724 {
725 size_t count = 0;
726 canon_ace *ace;
727
728 for (ace = l_head; ace; ace = ace->next)
729 count++;
730
731 return count;
732 }
733
734 /****************************************************************************
735 Free a linked list of canonical ACE entries.
736 ****************************************************************************/
737
738 static void free_canon_ace_list( canon_ace *l_head )
739 {
740 canon_ace *list, *next;
741
742 for (list = l_head; list; list = next) {
743 next = list->next;
744 DLIST_REMOVE(l_head, list);
745 SAFE_FREE(list);
746 }
747 }
748
749 /****************************************************************************
750 Function to duplicate a canon_ace entry.
751 ****************************************************************************/
752
753 static canon_ace *dup_canon_ace( canon_ace *src_ace)
754 {
755 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
756
757 if (dst_ace == NULL)
758 return NULL;
759
760 *dst_ace = *src_ace;
761 dst_ace->prev = dst_ace->next = NULL;
762 return dst_ace;
763 }
764
765 /****************************************************************************
766 Print out a canon ace.
767 ****************************************************************************/
768
769 static void print_canon_ace(canon_ace *pace, int num)
770 {
771 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
772 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
773 if (pace->owner_type == UID_ACE) {
774 const char *u_name = uidtoname(pace->unix_ug.uid);
775 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
776 } else if (pace->owner_type == GID_ACE) {
777 char *g_name = gidtoname(pace->unix_ug.gid);
778 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
779 } else
780 dbgtext( "other ");
781 switch (pace->type) {
782 case SMB_ACL_USER:
783 dbgtext( "SMB_ACL_USER ");
784 break;
785 case SMB_ACL_USER_OBJ:
786 dbgtext( "SMB_ACL_USER_OBJ ");
787 break;
788 case SMB_ACL_GROUP:
789 dbgtext( "SMB_ACL_GROUP ");
790 break;
791 case SMB_ACL_GROUP_OBJ:
792 dbgtext( "SMB_ACL_GROUP_OBJ ");
793 break;
794 case SMB_ACL_OTHER:
795 dbgtext( "SMB_ACL_OTHER ");
796 break;
797 default:
798 dbgtext( "MASK " );
799 break;
800 }
801
802 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
803 dbgtext( "perms ");
804 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
805 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
806 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
807 }
808
809 /****************************************************************************
810 Print out a canon ace list.
811 ****************************************************************************/
812
813 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
814 {
815 int count = 0;
816
817 if( DEBUGLVL( 10 )) {
818 dbgtext( "print_canon_ace_list: %s\n", name );
819 for (;ace_list; ace_list = ace_list->next, count++)
820 print_canon_ace(ace_list, count );
821 }
822 }
823
824 /****************************************************************************
825 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
826 ****************************************************************************/
827
828 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
829 {
830 mode_t ret = 0;
831
832 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
833 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
834 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
835
836 return ret;
837 }
838
839 /****************************************************************************
840 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
841 ****************************************************************************/
842
843 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
844 {
845 mode_t ret = 0;
846
847 if (mode & r_mask)
848 ret |= S_IRUSR;
849 if (mode & w_mask)
850 ret |= S_IWUSR;
851 if (mode & x_mask)
852 ret |= S_IXUSR;
853
854 return ret;
855 }
856
857 /****************************************************************************
858 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
859 an SMB_ACL_PERMSET_T.
860 ****************************************************************************/
861
862 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
863 {
864 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
865 return -1;
866 if (mode & S_IRUSR) {
867 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
868 return -1;
869 }
870 if (mode & S_IWUSR) {
871 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
872 return -1;
873 }
874 if (mode & S_IXUSR) {
875 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
876 return -1;
877 }
878 return 0;
879 }
880
881 /****************************************************************************
882 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
883 ****************************************************************************/
884
885 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
886 {
887 uid_to_sid( powner_sid, psbuf->st_ex_uid );
888 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
889 }
890
891 /****************************************************************************
892 Is the identity in two ACEs equal ? Check both SID and uid/gid.
893 ****************************************************************************/
894
895 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
896 {
897 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
898 return True;
899 }
900 if (ace1->owner_type == ace2->owner_type) {
901 if (ace1->owner_type == UID_ACE &&
902 ace1->unix_ug.uid == ace2->unix_ug.uid) {
903 return True;
904 } else if (ace1->owner_type == GID_ACE &&
905 ace1->unix_ug.gid == ace2->unix_ug.gid) {
906 return True;
907 }
908 }
909 return False;
910 }
911
912 /****************************************************************************
913 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
914 delete the second one. If the first is deny, mask the permissions off and delete the allow
915 if the permissions become zero, delete the deny if the permissions are non zero.
916 ****************************************************************************/
917
918 static void merge_aces( canon_ace **pp_list_head )
919 {
920 canon_ace *l_head = *pp_list_head;
921 canon_ace *curr_ace_outer;
922 canon_ace *curr_ace_outer_next;
923
924 /*
925 * First, merge allow entries with identical SIDs, and deny entries
926 * with identical SIDs.
927 */
928
929 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
930 canon_ace *curr_ace;
931 canon_ace *curr_ace_next;
932
933 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
934
935 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
936
937 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
938
939 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
940 (curr_ace->attr == curr_ace_outer->attr)) {
941
942 if( DEBUGLVL( 10 )) {
943 dbgtext("merge_aces: Merging ACE's\n");
944 print_canon_ace( curr_ace_outer, 0);
945 print_canon_ace( curr_ace, 0);
946 }
947
948 /* Merge two allow or two deny ACE's. */
949
950 curr_ace_outer->perms |= curr_ace->perms;
951 DLIST_REMOVE(l_head, curr_ace);
952 SAFE_FREE(curr_ace);
953 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
954 }
955 }
956 }
957
958 /*
959 * Now go through and mask off allow permissions with deny permissions.
960 * We can delete either the allow or deny here as we know that each SID
961 * appears only once in the list.
962 */
963
964 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
965 canon_ace *curr_ace;
966 canon_ace *curr_ace_next;
967
968 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
969
970 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
971
972 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
973
974 /*
975 * Subtract ACE's with different entries. Due to the ordering constraints
976 * we've put on the ACL, we know the deny must be the first one.
977 */
978
979 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
980 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
981
982 if( DEBUGLVL( 10 )) {
983 dbgtext("merge_aces: Masking ACE's\n");
984 print_canon_ace( curr_ace_outer, 0);
985 print_canon_ace( curr_ace, 0);
986 }
987
988 curr_ace->perms &= ~curr_ace_outer->perms;
989
990 if (curr_ace->perms == 0) {
991
992 /*
993 * The deny overrides the allow. Remove the allow.
994 */
995
996 DLIST_REMOVE(l_head, curr_ace);
997 SAFE_FREE(curr_ace);
998 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
999
1000 } else {
1001
1002 /*
1003 * Even after removing permissions, there
1004 * are still allow permissions - delete the deny.
1005 * It is safe to delete the deny here,
1006 * as we are guarenteed by the deny first
1007 * ordering that all the deny entries for
1008 * this SID have already been merged into one
1009 * before we can get to an allow ace.
1010 */
1011
1012 DLIST_REMOVE(l_head, curr_ace_outer);
1013 SAFE_FREE(curr_ace_outer);
1014 break;
1015 }
1016 }
1017
1018 } /* end for curr_ace */
1019 } /* end for curr_ace_outer */
1020
1021 /* We may have modified the list. */
1022
1023 *pp_list_head = l_head;
1024 }
1025
1026 /****************************************************************************
1027 Check if we need to return NT4.x compatible ACL entries.
1028 ****************************************************************************/
1029
1030 bool nt4_compatible_acls(void)
1031 {
1032 int compat = lp_acl_compatibility();
1033
1034 if (compat == ACL_COMPAT_AUTO) {
1035 enum remote_arch_types ra_type = get_remote_arch();
1036
1037 /* Automatically adapt to client */
1038 return (ra_type <= RA_WINNT);
1039 } else
1040 return (compat == ACL_COMPAT_WINNT);
1041 }
1042
1043
1044 /****************************************************************************
1045 Map canon_ace perms to permission bits NT.
1046 The attr element is not used here - we only process deny entries on set,
1047 not get. Deny entries are implicit on get with ace->perms = 0.
1048 ****************************************************************************/
1049
1050 static uint32_t map_canon_ace_perms(int snum,
1051 enum security_ace_type *pacl_type,
1052 mode_t perms,
1053 bool directory_ace)
1054 {
1055 uint32_t nt_mask = 0;
1056
1057 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1058
1059 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1060 if (directory_ace) {
1061 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1062 } else {
1063 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1064 }
1065 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1066 /*
1067 * Windows NT refuses to display ACEs with no permissions in them (but
1068 * they are perfectly legal with Windows 2000). If the ACE has empty
1069 * permissions we cannot use 0, so we use the otherwise unused
1070 * WRITE_OWNER permission, which we ignore when we set an ACL.
1071 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1072 * to be changed in the future.
1073 */
1074
1075 if (nt4_compatible_acls())
1076 nt_mask = UNIX_ACCESS_NONE;
1077 else
1078 nt_mask = 0;
1079 } else {
1080 if (directory_ace) {
1081 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1082 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1083 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1084 } else {
1085 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1086 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1087 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1088 }
1089 }
1090
1091 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1092 (unsigned int)perms, (unsigned int)nt_mask ));
1093
1094 return nt_mask;
1095 }
1096
1097 /****************************************************************************
1098 Map NT perms to a UNIX mode_t.
1099 ****************************************************************************/
1100
1101 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1102 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1103 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1104
1105 static mode_t map_nt_perms( uint32 *mask, int type)
1106 {
1107 mode_t mode = 0;
1108
1109 switch(type) {
1110 case S_IRUSR:
1111 if((*mask) & GENERIC_ALL_ACCESS)
1112 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1113 else {
1114 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1115 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1116 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1117 }
1118 break;
1119 case S_IRGRP:
1120 if((*mask) & GENERIC_ALL_ACCESS)
1121 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1122 else {
1123 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1124 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1125 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1126 }
1127 break;
1128 case S_IROTH:
1129 if((*mask) & GENERIC_ALL_ACCESS)
1130 mode = S_IROTH|S_IWOTH|S_IXOTH;
1131 else {
1132 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1133 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1134 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1135 }
1136 break;
1137 }
1138
1139 return mode;
1140 }
1141
1142 /****************************************************************************
1143 Unpack a SEC_DESC into a UNIX owner and group.
1144 ****************************************************************************/
1145
1146 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1147 {
1148 DOM_SID owner_sid;
1149 DOM_SID grp_sid;
1150
1151 *puser = (uid_t)-1;
1152 *pgrp = (gid_t)-1;
1153
1154 if(security_info_sent == 0) {
1155 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1156 return NT_STATUS_OK;
1157 }
1158
1159 /*
1160 * Validate the owner and group SID's.
1161 */
1162
1163 memset(&owner_sid, '\0', sizeof(owner_sid));
1164 memset(&grp_sid, '\0', sizeof(grp_sid));
1165
1166 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1167
1168 /*
1169 * Don't immediately fail if the owner sid cannot be validated.
1170 * This may be a group chown only set.
1171 */
1172
1173 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1174 sid_copy(&owner_sid, psd->owner_sid);
1175 if (!sid_to_uid(&owner_sid, puser)) {
1176 if (lp_force_unknown_acl_user(snum)) {
1177 /* this allows take ownership to work
1178 * reasonably */
1179 *puser = current_user.ut.uid;
1180 } else {
1181 DEBUG(3,("unpack_nt_owners: unable to validate"
1182 " owner sid for %s\n",
1183 sid_string_dbg(&owner_sid)));
1184 return NT_STATUS_INVALID_OWNER;
1185 }
1186 }
1187 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1188 (unsigned int)*puser ));
1189 }
1190
1191 /*
1192 * Don't immediately fail if the group sid cannot be validated.
1193 * This may be an owner chown only set.
1194 */
1195
1196 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1197 sid_copy(&grp_sid, psd->group_sid);
1198 if (!sid_to_gid( &grp_sid, pgrp)) {
1199 if (lp_force_unknown_acl_user(snum)) {
1200 /* this allows take group ownership to work
1201 * reasonably */
1202 *pgrp = current_user.ut.gid;
1203 } else {
1204 DEBUG(3,("unpack_nt_owners: unable to validate"
1205 " group sid.\n"));
1206 return NT_STATUS_INVALID_OWNER;
1207 }
1208 }
1209 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1210 (unsigned int)*pgrp));
1211 }
1212
1213 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1214
1215 return NT_STATUS_OK;
1216 }
1217
1218 /****************************************************************************
1219 Ensure the enforced permissions for this share apply.
1220 ****************************************************************************/
1221
1222 static void apply_default_perms(const struct share_params *params,
1223 const bool is_directory, canon_ace *pace,
1224 mode_t type)
1225 {
1226 mode_t and_bits = (mode_t)0;
1227 mode_t or_bits = (mode_t)0;
1228
1229 /* Get the initial bits to apply. */
1230
1231 if (is_directory) {
1232 and_bits = lp_dir_security_mask(params->service);
1233 or_bits = lp_force_dir_security_mode(params->service);
1234 } else {
1235 and_bits = lp_security_mask(params->service);
1236 or_bits = lp_force_security_mode(params->service);
1237 }
1238
1239 /* Now bounce them into the S_USR space. */
1240 switch(type) {
1241 case S_IRUSR:
1242 /* Ensure owner has read access. */
1243 pace->perms |= S_IRUSR;
1244 if (is_directory)
1245 pace->perms |= (S_IWUSR|S_IXUSR);
1246 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1247 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1248 break;
1249 case S_IRGRP:
1250 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1251 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1252 break;
1253 case S_IROTH:
1254 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1255 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1256 break;
1257 }
1258
1259 pace->perms = ((pace->perms & and_bits)|or_bits);
1260 }
1261
1262 /****************************************************************************
1263 Check if a given uid/SID is in a group gid/SID. This is probably very
1264 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1265 ****************************************************************************/
1266
1267 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1268 {
1269 const char *u_name = NULL;
1270
1271 /* "Everyone" always matches every uid. */
1272
1273 if (sid_equal(&group_ace->trustee, &global_sid_World))
1274 return True;
1275
1276 /*
1277 * if it's the current user, we already have the unix token
1278 * and don't need to do the complex user_in_group_sid() call
1279 */
1280 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1281 size_t i;
1282
1283 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1284 return True;
1285 }
1286
1287 for (i=0; i < current_user.ut.ngroups; i++) {
1288 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1289 return True;
1290 }
1291 }
1292 }
1293
1294 /* u_name talloc'ed off tos. */
1295 u_name = uidtoname(uid_ace->unix_ug.uid);
1296 if (!u_name) {
1297 return False;
1298 }
1299
1300 /*
1301 * user_in_group_sid() uses create_token_from_username()
1302 * which creates an artificial NT token given just a username,
1303 * so this is not reliable for users from foreign domains
1304 * exported by winbindd!
1305 */
1306 return user_in_group_sid(u_name, &group_ace->trustee);
1307 }
1308
1309 /****************************************************************************
1310 A well formed POSIX file or default ACL has at least 3 entries, a
1311 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1312 In addition, the owner must always have at least read access.
1313 When using this call on get_acl, the pst struct is valid and contains
1314 the mode of the file. When using this call on set_acl, the pst struct has
1315 been modified to have a mode containing the default for this file or directory
1316 type.
1317 ****************************************************************************/
1318
1319 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1320 const struct share_params *params,
1321 const bool is_directory,
1322 const DOM_SID *pfile_owner_sid,
1323 const DOM_SID *pfile_grp_sid,
1324 const SMB_STRUCT_STAT *pst,
1325 bool setting_acl)
1326 {
1327 canon_ace *pace;
1328 bool got_user = False;
1329 bool got_grp = False;
1330 bool got_other = False;
1331 canon_ace *pace_other = NULL;
1332
1333 for (pace = *pp_ace; pace; pace = pace->next) {
1334 if (pace->type == SMB_ACL_USER_OBJ) {
1335
1336 if (setting_acl)
1337 apply_default_perms(params, is_directory, pace, S_IRUSR);
1338 got_user = True;
1339
1340 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1341
1342 /*
1343 * Ensure create mask/force create mode is respected on set.
1344 */
1345
1346 if (setting_acl)
1347 apply_default_perms(params, is_directory, pace, S_IRGRP);
1348 got_grp = True;
1349
1350 } else if (pace->type == SMB_ACL_OTHER) {
1351
1352 /*
1353 * Ensure create mask/force create mode is respected on set.
1354 */
1355
1356 if (setting_acl)
1357 apply_default_perms(params, is_directory, pace, S_IROTH);
1358 got_other = True;
1359 pace_other = pace;
1360 }
1361 }
1362
1363 if (!got_user) {
1364 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1365 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1366 return False;
1367 }
1368
1369 ZERO_STRUCTP(pace);
1370 pace->type = SMB_ACL_USER_OBJ;
1371 pace->owner_type = UID_ACE;
1372 pace->unix_ug.uid = pst->st_ex_uid;
1373 pace->trustee = *pfile_owner_sid;
1374 pace->attr = ALLOW_ACE;
1375
1376 if (setting_acl) {
1377 /* See if the owning user is in any of the other groups in
1378 the ACE. If so, OR in the permissions from that group. */
1379
1380 bool group_matched = False;
1381 canon_ace *pace_iter;
1382
1383 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1384 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1385 if (uid_entry_in_group(pace, pace_iter)) {
1386 pace->perms |= pace_iter->perms;
1387 group_matched = True;
1388 }
1389 }
1390 }
1391
1392 /* If we only got an "everyone" perm, just use that. */
1393 if (!group_matched) {
1394 if (got_other)
1395 pace->perms = pace_other->perms;
1396 else
1397 pace->perms = 0;
1398 }
1399
1400 apply_default_perms(params, is_directory, pace, S_IRUSR);
1401 } else {
1402 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1403 }
1404
1405 DLIST_ADD(*pp_ace, pace);
1406 }
1407
1408 if (!got_grp) {
1409 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1410 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1411 return False;
1412 }
1413
1414 ZERO_STRUCTP(pace);
1415 pace->type = SMB_ACL_GROUP_OBJ;
1416 pace->owner_type = GID_ACE;
1417 pace->unix_ug.uid = pst->st_ex_gid;
1418 pace->trustee = *pfile_grp_sid;
1419 pace->attr = ALLOW_ACE;
1420 if (setting_acl) {
1421 /* If we only got an "everyone" perm, just use that. */
1422 if (got_other)
1423 pace->perms = pace_other->perms;
1424 else
1425 pace->perms = 0;
1426 apply_default_perms(params, is_directory, pace, S_IRGRP);
1427 } else {
1428 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1429 }
1430
1431 DLIST_ADD(*pp_ace, pace);
1432 }
1433
1434 if (!got_other) {
1435 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1436 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1437 return False;
1438 }
1439
1440 ZERO_STRUCTP(pace);
1441 pace->type = SMB_ACL_OTHER;
1442 pace->owner_type = WORLD_ACE;
1443 pace->unix_ug.world = -1;
1444 pace->trustee = global_sid_World;
1445 pace->attr = ALLOW_ACE;
1446 if (setting_acl) {
1447 pace->perms = 0;
1448 apply_default_perms(params, is_directory, pace, S_IROTH);
1449 } else
1450 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1451
1452 DLIST_ADD(*pp_ace, pace);
1453 }
1454
1455 return True;
1456 }
1457
1458 /****************************************************************************
1459 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1460 If it does not have them, check if there are any entries where the trustee is the
1461 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1462 ****************************************************************************/
1463
1464 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1465 {
1466 bool got_user_obj, got_group_obj;
1467 canon_ace *current_ace;
1468 int i, entries;
1469
1470 entries = count_canon_ace_list(ace);
1471 got_user_obj = False;
1472 got_group_obj = False;
1473
1474 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1475 if (current_ace->type == SMB_ACL_USER_OBJ)
1476 got_user_obj = True;
1477 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1478 got_group_obj = True;
1479 }
1480 if (got_user_obj && got_group_obj) {
1481 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1482 return;
1483 }
1484
1485 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1486 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1487 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1488 current_ace->type = SMB_ACL_USER_OBJ;
1489 got_user_obj = True;
1490 }
1491 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1492 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1493 current_ace->type = SMB_ACL_GROUP_OBJ;
1494 got_group_obj = True;
1495 }
1496 }
1497 if (!got_user_obj)
1498 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1499 if (!got_group_obj)
1500 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1501 }
1502
1503 /****************************************************************************
1504 Unpack a SEC_DESC into two canonical ace lists.
1505 ****************************************************************************/
1506
1507 static bool create_canon_ace_lists(files_struct *fsp,
1508 SMB_STRUCT_STAT *pst,
1509 DOM_SID *pfile_owner_sid,
1510 DOM_SID *pfile_grp_sid,
1511 canon_ace **ppfile_ace,
1512 canon_ace **ppdir_ace,
1513 const SEC_ACL *dacl)
1514 {
1515 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1516 canon_ace *file_ace = NULL;
1517 canon_ace *dir_ace = NULL;
1518 canon_ace *current_ace = NULL;
1519 bool got_dir_allow = False;
1520 bool got_file_allow = False;
1521 int i, j;
1522
1523 *ppfile_ace = NULL;
1524 *ppdir_ace = NULL;
1525
1526 /*
1527 * Convert the incoming ACL into a more regular form.
1528 */
1529
1530 for(i = 0; i < dacl->num_aces; i++) {
1531 SEC_ACE *psa = &dacl->aces[i];
1532
1533 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1534 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1535 return False;
1536 }
1537
1538 if (nt4_compatible_acls()) {
1539 /*
1540 * The security mask may be UNIX_ACCESS_NONE which should map into
1541 * no permissions (we overload the WRITE_OWNER bit for this) or it
1542 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1543 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1544 */
1545
1546 /*
1547 * Convert GENERIC bits to specific bits.
1548 */
1549
1550 se_map_generic(&psa->access_mask, &file_generic_mapping);
1551
1552 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1553
1554 if(psa->access_mask != UNIX_ACCESS_NONE)
1555 psa->access_mask &= ~UNIX_ACCESS_NONE;
1556 }
1557 }
1558
1559 /*
1560 * Deal with the fact that NT 4.x re-writes the canonical format
1561 * that we return for default ACLs. If a directory ACE is identical
1562 * to a inherited directory ACE then NT changes the bits so that the
1563 * first ACE is set to OI|IO and the second ACE for this SID is set
1564 * to CI. We need to repair this. JRA.
1565 */
1566
1567 for(i = 0; i < dacl->num_aces; i++) {
1568 SEC_ACE *psa1 = &dacl->aces[i];
1569
1570 for (j = i + 1; j < dacl->num_aces; j++) {
1571 SEC_ACE *psa2 = &dacl->aces[j];
1572
1573 if (psa1->access_mask != psa2->access_mask)
1574 continue;
1575
1576 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1577 continue;
1578
1579 /*
1580 * Ok - permission bits and SIDs are equal.
1581 * Check if flags were re-written.
1582 */
1583
1584 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1585
1586 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1587 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1588
1589 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1590
1591 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1592 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1593
1594 }
1595 }
1596 }
1597
1598 for(i = 0; i < dacl->num_aces; i++) {
1599 SEC_ACE *psa = &dacl->aces[i];
1600
1601 /*
1602 * Create a cannon_ace entry representing this NT DACL ACE.
1603 */
1604
1605 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1606 free_canon_ace_list(file_ace);
1607 free_canon_ace_list(dir_ace);
1608 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1609 return False;
1610 }
1611
1612 ZERO_STRUCTP(current_ace);
1613
1614 sid_copy(&current_ace->trustee, &psa->trustee);
1615
1616 /*
1617 * Try and work out if the SID is a user or group
1618 * as we need to flag these differently for POSIX.
1619 * Note what kind of a POSIX ACL this should map to.
1620 */
1621
1622 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1623 current_ace->owner_type = WORLD_ACE;
1624 current_ace->unix_ug.world = -1;
1625 current_ace->type = SMB_ACL_OTHER;
1626 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1627 current_ace->owner_type = UID_ACE;
1628 current_ace->unix_ug.uid = pst->st_ex_uid;
1629 current_ace->type = SMB_ACL_USER_OBJ;
1630
1631 /*
1632 * The Creator Owner entry only specifies inheritable permissions,
1633 * never access permissions. WinNT doesn't always set the ACE to
1634 *INHERIT_ONLY, though.
1635 */
1636
1637 if (nt4_compatible_acls())
1638 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1639 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1640 current_ace->owner_type = GID_ACE;
1641 current_ace->unix_ug.gid = pst->st_ex_gid;
1642 current_ace->type = SMB_ACL_GROUP_OBJ;
1643
1644 /*
1645 * The Creator Group entry only specifies inheritable permissions,
1646 * never access permissions. WinNT doesn't always set the ACE to
1647 *INHERIT_ONLY, though.
1648 */
1649 if (nt4_compatible_acls())
1650 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1651
1652 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1653 current_ace->owner_type = UID_ACE;
1654 /* If it's the owning user, this is a user_obj, not
1655 * a user. */
1656 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1657 current_ace->type = SMB_ACL_USER_OBJ;
1658 } else {
1659 current_ace->type = SMB_ACL_USER;
1660 }
1661 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1662 current_ace->owner_type = GID_ACE;
1663 /* If it's the primary group, this is a group_obj, not
1664 * a group. */
1665 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1666 current_ace->type = SMB_ACL_GROUP_OBJ;
1667 } else {
1668 current_ace->type = SMB_ACL_GROUP;
1669 }
1670 } else {
1671 /*
1672 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1673 */
1674
1675 if (non_mappable_sid(&psa->trustee)) {
1676 DEBUG(10, ("create_canon_ace_lists: ignoring "
1677 "non-mappable SID %s\n",
1678 sid_string_dbg(&psa->trustee)));
1679 SAFE_FREE(current_ace);
1680 continue;
1681 }
1682
1683 free_canon_ace_list(file_ace);
1684 free_canon_ace_list(dir_ace);
1685 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1686 "%s to uid or gid.\n",
1687 sid_string_dbg(&current_ace->trustee)));
1688 SAFE_FREE(current_ace);
1689 return False;
1690 }
1691
1692 /*
1693 * Map the given NT permissions into a UNIX mode_t containing only
1694 * S_I(R|W|X)USR bits.
1695 */
1696
1697 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1698 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1699
1700 /* Store the ace_flag. */
1701 current_ace->ace_flags = psa->flags;
1702
1703 /*
1704 * Now add the created ace to either the file list, the directory
1705 * list, or both. We *MUST* preserve the order here (hence we use
1706 * DLIST_ADD_END) as NT ACLs are order dependent.
1707 */
1708
1709 if (fsp->is_directory) {
1710
1711 /*
1712 * We can only add to the default POSIX ACE list if the ACE is
1713 * designed to be inherited by both files and directories.
1714 */
1715
1716 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1717 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1718
1719 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1720
1721 /*
1722 * Note if this was an allow ace. We can't process
1723 * any further deny ace's after this.
1724 */
1725
1726 if (current_ace->attr == ALLOW_ACE)
1727 got_dir_allow = True;
1728
1729 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1730 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1731 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1732 free_canon_ace_list(file_ace);
1733 free_canon_ace_list(dir_ace);
1734 return False;
1735 }
1736
1737 if( DEBUGLVL( 10 )) {
1738 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1739 print_canon_ace( current_ace, 0);
1740 }
1741
1742 /*
1743 * If this is not an inherit only ACE we need to add a duplicate
1744 * to the file acl.
1745 */
1746
1747 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1748 canon_ace *dup_ace = dup_canon_ace(current_ace);
1749
1750 if (!dup_ace) {
1751 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1752 free_canon_ace_list(file_ace);
1753 free_canon_ace_list(dir_ace);
1754 return False;
1755 }
1756
1757 /*
1758 * We must not free current_ace here as its
1759 * pointer is now owned by the dir_ace list.
1760 */
1761 current_ace = dup_ace;
1762 } else {
1763 /*
1764 * We must not free current_ace here as its
1765 * pointer is now owned by the dir_ace list.
1766 */
1767 current_ace = NULL;
1768 }
1769 }
1770 }
1771
1772 /*
1773 * Only add to the file ACL if not inherit only.
1774 */
1775
1776 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1777 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1778
1779 /*
1780 * Note if this was an allow ace. We can't process
1781 * any further deny ace's after this.
1782 */
1783
1784 if (current_ace->attr == ALLOW_ACE)
1785 got_file_allow = True;
1786
1787 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1788 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1789 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1790 free_canon_ace_list(file_ace);
1791 free_canon_ace_list(dir_ace);
1792 return False;
1793 }
1794
1795 if( DEBUGLVL( 10 )) {
1796 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1797 print_canon_ace( current_ace, 0);
1798 }
1799 all_aces_are_inherit_only = False;
1800 /*
1801 * We must not free current_ace here as its
1802 * pointer is now owned by the file_ace list.
1803 */
1804 current_ace = NULL;
1805 }
1806
1807 /*
1808 * Free if ACE was not added.
1809 */
1810
1811 SAFE_FREE(current_ace);
1812 }
1813
1814 if (fsp->is_directory && all_aces_are_inherit_only) {
1815 /*
1816 * Windows 2000 is doing one of these weird 'inherit acl'
1817 * traverses to conserve NTFS ACL resources. Just pretend
1818 * there was no DACL sent. JRA.
1819 */
1820
1821 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1822 free_canon_ace_list(file_ace);
1823 free_canon_ace_list(dir_ace);
1824 file_ace = NULL;
1825 dir_ace = NULL;
1826 } else {
1827 /*
1828 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1829 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1830 * entries can be converted to *_OBJ. Usually we will already have these
1831 * entries in the Default ACL, and the Access ACL will not have them.
1832 */
1833 if (file_ace) {
1834 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1835 }
1836 if (dir_ace) {
1837 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1838 }
1839 }
1840
1841 *ppfile_ace = file_ace;
1842 *ppdir_ace = dir_ace;
1843
1844 return True;
1845 }
1846
1847 /****************************************************************************
1848 ASCII art time again... JRA :-).
1849
1850 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1851 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1852 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1853 allow or deny have been merged, so the same SID can only appear once in the deny
1854 list or once in the allow list.
1855
1856 We then process as follows :
1857
1858 ---------------------------------------------------------------------------
1859 First pass - look for a Everyone DENY entry.
1860
1861 If it is deny all (rwx) trunate the list at this point.
1862 Else, walk the list from this point and use the deny permissions of this
1863 entry as a mask on all following allow entries. Finally, delete
1864 the Everyone DENY entry (we have applied it to everything possible).
1865
1866 In addition, in this pass we remove any DENY entries that have
1867 no permissions (ie. they are a DENY nothing).
1868 ---------------------------------------------------------------------------
1869 Second pass - only deal with deny user entries.
1870
1871 DENY user1 (perms XXX)
1872
1873 new_perms = 0
1874 for all following allow group entries where user1 is in group
1875 new_perms |= group_perms;
1876
1877 user1 entry perms = new_perms & ~ XXX;
1878
1879 Convert the deny entry to an allow entry with the new perms and
1880 push to the end of the list. Note if the user was in no groups
1881 this maps to a specific allow nothing entry for this user.
1882
1883 The common case from the NT ACL choser (userX deny all) is
1884 optimised so we don't do the group lookup - we just map to
1885 an allow nothing entry.
1886
1887 What we're doing here is inferring the allow permissions the
1888 person setting the ACE on user1 wanted by looking at the allow
1889 permissions on the groups the user is currently in. This will
1890 be a snapshot, depending on group membership but is the best
1891 we can do and has the advantage of failing closed rather than
1892 open.
1893 ---------------------------------------------------------------------------
1894 Third pass - only deal with deny group entries.
1895
1896 DENY group1 (perms XXX)
1897
1898 for all following allow user entries where user is in group1
1899 user entry perms = user entry perms & ~ XXX;
1900
1901 If there is a group Everyone allow entry with permissions YYY,
1902 convert the group1 entry to an allow entry and modify its
1903 permissions to be :
1904
1905 new_perms = YYY & ~ XXX
1906
1907 and push to the end of the list.
1908
1909 If there is no group Everyone allow entry then convert the
1910 group1 entry to a allow nothing entry and push to the end of the list.
1911
1912 Note that the common case from the NT ACL choser (groupX deny all)
1913 cannot be optimised here as we need to modify user entries who are
1914 in the group to change them to a deny all also.
1915
1916 What we're doing here is modifying the allow permissions of
1917 user entries (which are more specific in POSIX ACLs) to mask
1918 out the explicit deny set on the group they are in. This will
1919 be a snapshot depending on current group membership but is the
1920 best we can do and has the advantage of failing closed rather
1921 than open.
1922 ---------------------------------------------------------------------------
1923 Fourth pass - cope with cumulative permissions.
1924
1925 for all allow user entries, if there exists an allow group entry with
1926 more permissive permissions, and the user is in that group, rewrite the
1927 allow user permissions to contain both sets of permissions.
1928
1929 Currently the code for this is #ifdef'ed out as these semantics make
1930 no sense to me. JRA.
1931 ---------------------------------------------------------------------------
1932
1933 Note we *MUST* do the deny user pass first as this will convert deny user
1934 entries into allow user entries which can then be processed by the deny
1935 group pass.
1936
1937 The above algorithm took a *lot* of thinking about - hence this
1938 explaination :-). JRA.
1939 ****************************************************************************/
1940
1941 /****************************************************************************
1942 Process a canon_ace list entries. This is very complex code. We need
1943 to go through and remove the "deny" permissions from any allow entry that matches
1944 the id of this entry. We have already refused any NT ACL that wasn't in correct
1945 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1946 we just remove it (to fail safe). We have already removed any duplicate ace
1947 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1948 allow entries.
1949 ****************************************************************************/
1950
1951 static void process_deny_list( canon_ace **pp_ace_list )
1952 {
1953 canon_ace *ace_list = *pp_ace_list;
1954 canon_ace *curr_ace = NULL;
1955 canon_ace *curr_ace_next = NULL;
1956
1957 /* Pass 1 above - look for an Everyone, deny entry. */
1958
1959 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1960 canon_ace *allow_ace_p;
1961
1962 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1963
1964 if (curr_ace->attr != DENY_ACE)
1965 continue;
1966
1967 if (curr_ace->perms == (mode_t)0) {
1968
1969 /* Deny nothing entry - delete. */
1970
1971 DLIST_REMOVE(ace_list, curr_ace);
1972 continue;
1973 }
1974
1975 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1976 continue;
1977
1978 /* JRATEST - assert. */
1979 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1980
1981 if (curr_ace->perms == ALL_ACE_PERMS) {
1982
1983 /*
1984 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1985 * list at this point including this entry.
1986 */
1987
1988 canon_ace *prev_entry = curr_ace->prev;
1989
1990 free_canon_ace_list( curr_ace );
1991 if (prev_entry)
1992 prev_entry->next = NULL;
1993 else {
1994 /* We deleted the entire list. */
1995 ace_list = NULL;
1996 }
1997 break;
1998 }
1999
2000 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2001
2002 /*
2003 * Only mask off allow entries.
2004 */
2005
2006 if (allow_ace_p->attr != ALLOW_ACE)
2007 continue;
2008
2009 allow_ace_p->perms &= ~curr_ace->perms;
2010 }
2011
2012 /*
2013 * Now it's been applied, remove it.
2014 */
2015
2016 DLIST_REMOVE(ace_list, curr_ace);
2017 }
2018
2019 /* Pass 2 above - deal with deny user entries. */
2020
2021 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2022 mode_t new_perms = (mode_t)0;
2023 canon_ace *allow_ace_p;
2024
2025 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2026
2027 if (curr_ace->attr != DENY_ACE)
2028 continue;
2029
2030 if (curr_ace->owner_type != UID_ACE)
2031 continue;
2032
2033 if (curr_ace->perms == ALL_ACE_PERMS) {
2034
2035 /*
2036 * Optimisation - this is a deny everything to this user.
2037 * Convert to an allow nothing and push to the end of the list.
2038 */
2039
2040 curr_ace->attr = ALLOW_ACE;
2041 curr_ace->perms = (mode_t)0;
2042 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2043 continue;
2044 }
2045
2046 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2047
2048 if (allow_ace_p->attr != ALLOW_ACE)
2049 continue;
2050
2051 /* We process GID_ACE and WORLD_ACE entries only. */
2052
2053 if (allow_ace_p->owner_type == UID_ACE)
2054 continue;
2055
2056 if (uid_entry_in_group( curr_ace, allow_ace_p))
2057 new_perms |= allow_ace_p->perms;
2058 }
2059
2060 /*
2061 * Convert to a allow entry, modify the perms and push to the end
2062 * of the list.
2063 */
2064
2065 curr_ace->attr = ALLOW_ACE;
2066 curr_ace->perms = (new_perms & ~curr_ace->perms);
2067 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2068 }
2069
2070 /* Pass 3 above - deal with deny group entries. */
2071
2072 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2073 canon_ace *allow_ace_p;
2074 canon_ace *allow_everyone_p = NULL;
2075
2076 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2077
2078 if (curr_ace->attr != DENY_ACE)
2079 continue;
2080
2081 if (curr_ace->owner_type != GID_ACE)
2082 continue;
2083
2084 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2085
2086 if (allow_ace_p->attr != ALLOW_ACE)
2087 continue;
2088
2089 /* Store a pointer to the Everyone allow, if it exists. */
2090 if (allow_ace_p->owner_type == WORLD_ACE)
2091 allow_everyone_p = allow_ace_p;
2092
2093 /* We process UID_ACE entries only. */
2094
2095 if (allow_ace_p->owner_type != UID_ACE)
2096 continue;
2097
2098 /* Mask off the deny group perms. */
2099
2100 if (uid_entry_in_group( allow_ace_p, curr_ace))
2101 allow_ace_p->perms &= ~curr_ace->perms;
2102 }
2103
2104 /*
2105 * Convert the deny to an allow with the correct perms and
2106 * push to the end of the list.
2107 */
2108
2109 curr_ace->attr = ALLOW_ACE;
2110 if (allow_everyone_p)
2111 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2112 else
2113 curr_ace->perms = (mode_t)0;
2114 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2115 }
2116
2117 /* Doing this fourth pass allows Windows semantics to be layered
2118 * on top of POSIX semantics. I'm not sure if this is desirable.
2119 * For example, in W2K ACLs there is no way to say, "Group X no
2120 * access, user Y full access" if user Y is a member of group X.
2121 * This seems completely broken semantics to me.... JRA.
2122 */
2123
2124 #if 0
2125 /* Pass 4 above - deal with allow entries. */
2126
2127 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2128 canon_ace *allow_ace_p;
2129
2130 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132 if (curr_ace->attr != ALLOW_ACE)
2133 continue;
2134
2135 if (curr_ace->owner_type != UID_ACE)
2136 continue;
2137
2138 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2139
2140 if (allow_ace_p->attr != ALLOW_ACE)
2141 continue;
2142
2143 /* We process GID_ACE entries only. */
2144
2145 if (allow_ace_p->owner_type != GID_ACE)
2146 continue;
2147
2148 /* OR in the group perms. */
2149
2150 if (uid_entry_in_group( curr_ace, allow_ace_p))
2151 curr_ace->perms |= allow_ace_p->perms;
2152 }
2153 }
2154 #endif
2155
2156 *pp_ace_list = ace_list;
2157 }
2158
2159 /****************************************************************************
2160 Create a default mode that will be used if a security descriptor entry has
2161 no user/group/world entries.
2162 ****************************************************************************/
2163
2164 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2165 {
2166 int snum = SNUM(fsp->conn);
2167 mode_t and_bits = (mode_t)0;
2168 mode_t or_bits = (mode_t)0;
2169 mode_t mode;
2170
2171 if (interitable_mode) {
2172 struct smb_filename *smb_fname = NULL;
2173 NTSTATUS status;
2174
2175 status = create_synthetic_smb_fname_split(talloc_tos(),
2176 fsp->fsp_name, NULL,
2177 &smb_fname);
2178 if (!NT_STATUS_IS_OK(status)) {
2179 return 0;
2180 }
2181 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE, smb_fname,
2182 NULL);
2183 } else {
2184 mode = S_IRUSR;
2185 }
2186
2187 if (fsp->is_directory)
2188 mode |= (S_IWUSR|S_IXUSR);
2189
2190 /*
2191 * Now AND with the create mode/directory mode bits then OR with the
2192 * force create mode/force directory mode bits.
2193 */
2194
2195 if (fsp->is_directory) {
2196 and_bits = lp_dir_security_mask(snum);
2197 or_bits = lp_force_dir_security_mode(snum);
2198 } else {
2199 and_bits = lp_security_mask(snum);
2200 or_bits = lp_force_security_mode(snum);
2201 }
2202
2203 return ((mode & and_bits)|or_bits);
2204 }
2205
2206 /****************************************************************************
2207 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2208 succeeding.
2209 ****************************************************************************/
2210
2211 static bool unpack_canon_ace(files_struct *fsp,
2212 SMB_STRUCT_STAT *pst,
2213 DOM_SID *pfile_owner_sid,
2214 DOM_SID *pfile_grp_sid,
2215 canon_ace **ppfile_ace,
2216 canon_ace **ppdir_ace,
2217 uint32 security_info_sent,
2218 const SEC_DESC *psd)
2219 {
2220 canon_ace *file_ace = NULL;
2221 canon_ace *dir_ace = NULL;
2222
2223 *ppfile_ace = NULL;
2224 *ppdir_ace = NULL;
2225
2226 if(security_info_sent == 0) {
2227 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2228 return False;
2229 }
2230
2231 /*
2232 * If no DACL then this is a chown only security descriptor.
2233 */
2234
2235 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2236 return True;
2237
2238 /*
2239 * Now go through the DACL and create the canon_ace lists.
2240 */
2241
2242 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2243 &file_ace, &dir_ace, psd->dacl))
2244 return False;
2245
2246 if ((file_ace == NULL) && (dir_ace == NULL)) {
2247 /* W2K traverse DACL set - ignore. */
2248 return True;
2249 }
2250
2251 /*
2252 * Go through the canon_ace list and merge entries
2253 * belonging to identical users of identical allow or deny type.
2254 * We can do this as all deny entries come first, followed by
2255 * all allow entries (we have mandated this before accepting this acl).
2256 */
2257
2258 print_canon_ace_list( "file ace - before merge", file_ace);
2259 merge_aces( &file_ace );
2260
2261 print_canon_ace_list( "dir ace - before merge", dir_ace);
2262 merge_aces( &dir_ace );
2263
2264 /*
2265 * NT ACLs are order dependent. Go through the acl lists and
2266 * process DENY entries by masking the allow entries.
2267 */
2268
2269 print_canon_ace_list( "file ace - before deny", file_ace);
2270 process_deny_list( &file_ace);
2271
2272 print_canon_ace_list( "dir ace - before deny", dir_ace);
2273 process_deny_list( &dir_ace);
2274
2275 /*
2276 * A well formed POSIX file or default ACL has at least 3 entries, a
2277 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2278 * and optionally a mask entry. Ensure this is the case.
2279 */
2280
2281 print_canon_ace_list( "file ace - before valid", file_ace);
2282
2283 /*
2284 * A default 3 element mode entry for a file should be r-- --- ---.
2285 * A default 3 element mode entry for a directory should be rwx --- ---.
2286 */
2287
2288 pst->st_ex_mode = create_default_mode(fsp, False);
2289
2290 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2291 free_canon_ace_list(file_ace);
2292 free_canon_ace_list(dir_ace);
2293 return False;
2294 }
2295
2296 print_canon_ace_list( "dir ace - before valid", dir_ace);
2297
2298 /*
2299 * A default inheritable 3 element mode entry for a directory should be the
2300 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2301 * it's a directory.
2302 */
2303
2304 pst->st_ex_mode = create_default_mode(fsp, True);
2305
2306 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2307 free_canon_ace_list(file_ace);
2308 free_canon_ace_list(dir_ace);
2309 return False;
2310 }
2311
2312 print_canon_ace_list( "file ace - return", file_ace);
2313 print_canon_ace_list( "dir ace - return", dir_ace);
2314
2315 *ppfile_ace = file_ace;
2316 *ppdir_ace = dir_ace;
2317 return True;
2318
2319 }
2320
2321 /******************************************************************************
2322 When returning permissions, try and fit NT display
2323 semantics if possible. Note the the canon_entries here must have been malloced.
2324 The list format should be - first entry = owner, followed by group and other user
2325 entries, last entry = other.
2326
2327 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2328 are not ordered, and match on the most specific entry rather than walking a list,
2329 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2330
2331 Entry 0: owner : deny all except read and write.
2332 Entry 1: owner : allow read and write.
2333 Entry 2: group : deny all except read.
2334 Entry 3: group : allow read.
2335 Entry 4: Everyone : allow read.
2336
2337 But NT cannot display this in their ACL editor !
2338 ********************************************************************************/
2339
2340 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2341 {
2342 canon_ace *l_head = *pp_list_head;
2343 canon_ace *owner_ace = NULL;
2344 canon_ace *other_ace = NULL;
2345 canon_ace *ace = NULL;
2346
2347 for (ace = l_head; ace; ace = ace->next) {
2348 if (ace->type == SMB_ACL_USER_OBJ)
2349 owner_ace = ace;
2350 else if (ace->type == SMB_ACL_OTHER) {
2351 /* Last ace - this is "other" */
2352 other_ace = ace;
2353 }
2354 }
2355
2356 if (!owner_ace || !other_ace) {
2357 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2358 filename ));
2359 return;
2360 }
2361
2362 /*
2363 * The POSIX algorithm applies to owner first, and other last,
2364 * so ensure they are arranged in this order.
2365 */
2366
2367 if (owner_ace) {
2368 DLIST_PROMOTE(l_head, owner_ace);
2369 }
2370
2371 if (other_ace) {
2372 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2373 }
2374
2375 /* We have probably changed the head of the list. */
2376
2377 *pp_list_head = l_head;
2378 }
2379
2380 /****************************************************************************
2381 Create a linked list of canonical ACE entries.
2382 ****************************************************************************/
2383
2384 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2385 const char *fname, SMB_ACL_T posix_acl,
2386 const SMB_STRUCT_STAT *psbuf,
2387 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2388 {
2389 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2390 canon_ace *l_head = NULL;
2391 canon_ace *ace = NULL;
2392 canon_ace *next_ace = NULL;
2393 int entry_id = SMB_ACL_FIRST_ENTRY;
2394 SMB_ACL_ENTRY_T entry;
2395 size_t ace_count;
2396
2397 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2398 SMB_ACL_TAG_T tagtype;
2399 SMB_ACL_PERMSET_T permset;
2400 DOM_SID sid;
2401 posix_id unix_ug;
2402 enum ace_owner owner_type;
2403
2404 entry_id = SMB_ACL_NEXT_ENTRY;
2405
2406 /* Is this a MASK entry ? */
2407 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2408 continue;
2409
2410 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2411 continue;
2412
2413 /* Decide which SID to use based on the ACL type. */
2414 switch(tagtype) {
2415 case SMB_ACL_USER_OBJ:
2416 /* Get the SID from the owner. */
2417 sid_copy(&sid, powner);
2418 unix_ug.uid = psbuf->st_ex_uid;
2419 owner_type = UID_ACE;
2420 break;
2421 case SMB_ACL_USER:
2422 {
2423 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2424 if (puid == NULL) {
2425 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2426 continue;
2427 }
2428 /*
2429 * A SMB_ACL_USER entry for the owner is shadowed by the
2430 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2431 * that entry, so we ignore it. We also don't create such
2432 * entries out of the blue when setting ACLs, so a get/set
2433 * cycle will drop them.
2434 */
2435 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_ex_uid) {
2436 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2437 continue;
2438 }
2439 uid_to_sid( &sid, *puid);
2440 unix_ug.uid = *puid;
2441 owner_type = UID_ACE;
2442 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2443 break;
2444 }
2445 case SMB_ACL_GROUP_OBJ:
2446 /* Get the SID from the owning group. */
2447 sid_copy(&sid, pgroup);
2448 unix_ug.gid = psbuf->st_ex_gid;
2449 owner_type = GID_ACE;
2450 break;
2451 case SMB_ACL_GROUP:
2452 {
2453 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2454 if (pgid == NULL) {
2455 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2456 continue;
2457 }
2458 gid_to_sid( &sid, *pgid);
2459 unix_ug.gid = *pgid;
2460 owner_type = GID_ACE;
2461 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2462 break;
2463 }
2464 case SMB_ACL_MASK:
2465 acl_mask = convert_permset_to_mode_t(conn, permset);
2466 continue; /* Don't count the mask as an entry. */
2467 case SMB_ACL_OTHER:
2468 /* Use the Everyone SID */
2469 sid = global_sid_World;
2470 unix_ug.world = -1;
2471 owner_type = WORLD_ACE;
2472 break;
2473 default:
2474 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2475 continue;
2476 }
2477
2478 /*
2479 * Add this entry to the list.
2480 */
2481
2482 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2483 goto fail;
2484
2485 ZERO_STRUCTP(ace);
2486 ace->type = tagtype;
2487 ace->perms = convert_permset_to_mode_t(conn, permset);
2488 ace->attr = ALLOW_ACE;
2489 ace->trustee = sid;
2490 ace->unix_ug = unix_ug;
2491 ace->owner_type = owner_type;
2492 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2493
2494 DLIST_ADD(l_head, ace);
2495 }
2496
2497 /*
2498 * This next call will ensure we have at least a user/group/world set.
2499 */
2500
2501 if (!ensure_canon_entry_valid(&l_head, conn->params,
2502 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2503 psbuf, False))
2504 goto fail;
2505
2506 /*
2507 * Now go through the list, masking the permissions with the
2508 * acl_mask. Ensure all DENY Entries are at the start of the list.
2509 */
2510
2511 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2512
2513 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2514 next_ace = ace->next;
2515
2516 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2517 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2518 ace->perms &= acl_mask;
2519
2520 if (ace->perms == 0) {
2521 DLIST_PROMOTE(l_head, ace);
2522 }
2523
2524 if( DEBUGLVL( 10 ) ) {
2525 print_canon_ace(ace, ace_count);
2526 }
2527 }
2528
2529 arrange_posix_perms(fname,&l_head );
2530
2531 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2532
2533 return l_head;
2534
2535 fail:
2536
2537 free_canon_ace_list(l_head);
2538 return NULL;
2539 }
2540
2541 /****************************************************************************
2542 Check if the current user group list contains a given group.
2543 ****************************************************************************/
2544
2545 static bool current_user_in_group(gid_t gid)
2546 {
2547 int i;
2548
2549 for (i = 0; i < current_user.ut.ngroups; i++) {
2550 if (current_user.ut.groups[i] == gid) {
2551 return True;
2552 }
2553 }
2554
2555 return False;
2556 }
2557
2558 /****************************************************************************
2559 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2560 ****************************************************************************/
2561
2562 static bool acl_group_override(connection_struct *conn,
2563 const struct smb_filename *smb_fname)
2564 {
2565 if ((errno != EPERM) && (errno != EACCES)) {
2566 return false;
2567 }
2568
2569 /* file primary group == user primary or supplementary group */
2570 if (lp_acl_group_control(SNUM(conn)) &&
2571 current_user_in_group(smb_fname->st.st_ex_gid)) {
2572 return true;
2573 }
2574
2575 /* user has writeable permission */
2576 if (lp_dos_filemode(SNUM(conn)) &&
2577 can_write_to_file(conn, smb_fname)) {
2578 return true;
2579 }
2580
2581 return false;
2582 }
2583
2584 /****************************************************************************
2585 Attempt to apply an ACL to a file or directory.
2586 ****************************************************************************/
2587
2588 static bool set_canon_ace_list(files_struct *fsp,
2589 canon_ace *the_ace,
2590 bool default_ace,
2591 const SMB_STRUCT_STAT *psbuf,
2592 bool *pacl_set_support)
2593 {
2594 connection_struct *conn = fsp->conn;
2595 bool ret = False;
2596 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2597 canon_ace *p_ace;
2598 int i;
2599 SMB_ACL_ENTRY_T mask_entry;
2600 bool got_mask_entry = False;
2601 SMB_ACL_PERMSET_T mask_permset;
2602 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2603 bool needs_mask = False;
2604 mode_t mask_perms = 0;
2605 struct smb_filename *smb_fname = NULL;
2606 NTSTATUS status;
2607
2608 status = create_synthetic_smb_fname_split(talloc_tos(), fsp->fsp_name,
2609 psbuf, &smb_fname);
2610 if (!NT_STATUS_IS_OK(status)) {
2611 goto fail;
2612 }
2613
2614 #if defined(POSIX_ACL_NEEDS_MASK)
2615 /* HP-UX always wants to have a mask (called "class" there). */
2616 needs_mask = True;
2617 #endif
2618
2619 if (the_acl == NULL) {
2620
2621 if (!no_acl_syscall_error(errno)) {
2622 /*
2623 * Only print this error message if we have some kind of ACL
2624 * support that's not working. Otherwise we would always get this.
2625 */
2626 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2627 default_ace ? "default" : "file", strerror(errno) ));
2628 }
2629 *pacl_set_support = False;
2630 goto fail;
2631 }
2632
2633 if( DEBUGLVL( 10 )) {
2634 dbgtext("set_canon_ace_list: setting ACL:\n");
2635 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2636 print_canon_ace( p_ace, i);
2637 }
2638 }
2639
2640 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2641 SMB_ACL_ENTRY_T the_entry;
2642 SMB_ACL_PERMSET_T the_permset;
2643
2644 /*
2645 * ACLs only "need" an ACL_MASK entry if there are any named user or
2646 * named group entries. But if there is an ACL_MASK entry, it applies
2647 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2648 * so that it doesn't deny (i.e., mask off) any permissions.
2649 */
2650
2651 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2652 needs_mask = True;
2653 mask_perms |= p_ace->perms;
2654 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2655 mask_perms |= p_ace->perms;
2656 }
2657
2658 /*
2659 * Get the entry for this ACE.
2660 */
2661
2662 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2663 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2664 i, strerror(errno) ));
2665 goto fail;
2666 }
2667
2668 if (p_ace->type == SMB_ACL_MASK) {
2669 mask_entry = the_entry;
2670 got_mask_entry = True;
2671 }
2672
2673 /*
2674 * Ok - we now know the ACL calls should be working, don't
2675 * allow fallback to chmod.
2676 */
2677
2678 *pacl_set_support = True;
2679
2680 /*
2681 * Initialise the entry from the canon_ace.
2682 */
2683
2684 /*
2685 * First tell the entry what type of ACE this is.
2686 */
2687
2688 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2689 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2690 i, strerror(errno) ));
2691 goto fail;
2692 }
2693
2694 /*
2695 * Only set the qualifier (user or group id) if the entry is a user
2696 * or group id ACE.
2697 */
2698
2699 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2700 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2701 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2702 i, strerror(errno) ));
2703 goto fail;
2704 }
2705 }
2706
2707 /*
2708 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2709 */
2710
2711 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2712 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2713 i, strerror(errno) ));
2714 goto fail;
2715 }
2716
2717 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2718 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2719 (unsigned int)p_ace->perms, i, strerror(errno) ));
2720 goto fail;
2721 }
2722
2723 /*
2724 * ..and apply them to the entry.
2725 */
2726
2727 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2728 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2729 i, strerror(errno) ));
2730 goto fail;
2731 }
2732
2733 if( DEBUGLVL( 10 ))
2734 print_canon_ace( p_ace, i);
2735
2736 }
2737
2738 if (needs_mask && !got_mask_entry) {
2739 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2740 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2741 goto fail;
2742 }
2743
2744 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2745 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2746 goto fail;
2747 }
2748
2749 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2750 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2751 goto fail;
2752 }
2753
2754 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2755 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2756 goto fail;
2757 }
2758
2759 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2760 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2761 goto fail;
2762 }
2763 }
2764
2765 /*
2766 * Finally apply it to the file or directory.
2767 */
2768
2769 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2770 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname->base_name,
2771 the_acl_type, the_acl) == -1) {
2772 /*
2773 * Some systems allow all the above calls and only fail with no ACL support
2774 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2775 */
2776 if (no_acl_syscall_error(errno)) {
2777 *pacl_set_support = False;
2778 }
2779
2780 if (acl_group_override(conn, smb_fname)) {
2781 int sret;
2782
2783 DEBUG(5,("set_canon_ace_list: acl group "
2784 "control on and current user in file "
2785 "%s primary group.\n",
2786 smb_fname_str_dbg(smb_fname)));
2787
2788 become_root();
2789 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2790 smb_fname->base_name, the_acl_type,
2791 the_acl);
2792 unbecome_root();
2793 if (sret == 0) {
2794 ret = True;
2795 }
2796 }
2797
2798 if (ret == False) {
2799 DEBUG(2,("set_canon_ace_list: "
2800 "sys_acl_set_file type %s failed for "
2801 "file %s (%s).\n",
2802 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2803 "directory default" : "file",
2804 smb_fname_str_dbg(smb_fname),
2805 strerror(errno)));
2806 goto fail;
2807 }
2808 }
2809 } else {
2810 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2811 /*
2812 * Some systems allow all the above calls and only fail with no ACL support
2813 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2814 */
2815 if (no_acl_syscall_error(errno)) {
2816 *pacl_set_support = False;
2817 }
2818
2819 if (acl_group_override(conn, smb_fname)) {
2820 int sret;
2821
2822 DEBUG(5,("set_canon_ace_list: acl group "
2823 "control on and current user in file "
2824 "%s primary group.\n",
2825 smb_fname_str_dbg(smb_fname)));
2826
2827 become_root();
2828 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2829 unbecome_root();
2830 if (sret == 0) {
2831 ret = True;
2832 }
2833 }
2834
2835 if (ret == False) {
2836 DEBUG(2,("set_canon_ace_list: "
2837 "sys_acl_set_file failed for file %s "
2838 "(%s).\n",
2839 smb_fname_str_dbg(smb_fname),
2840 strerror(errno) ));
2841 goto fail;
2842 }
2843 }
2844 }
2845
2846 ret = True;
2847
2848 fail:
2849
2850 if (the_acl != NULL) {
2851 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2852 }
2853 TALLOC_FREE(smb_fname);
2854
2855 return ret;
2856 }
2857
2858 /****************************************************************************
2859 Find a particular canon_ace entry.
2860 ****************************************************************************/
2861
2862 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2863 {
2864 while (list) {
2865 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2866 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2867 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2868 break;
2869 list = list->next;
2870 }
2871 return list;
2872 }
2873
2874 /****************************************************************************
2875
2876 ****************************************************************************/
2877
2878 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2879 {
2880 SMB_ACL_ENTRY_T entry;
2881
2882 if (!the_acl)
2883 return NULL;
2884 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2885 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2886 return NULL;
2887 }
2888 return the_acl;
2889 }
2890
2891 /****************************************************************************
2892 Convert a canon_ace to a generic 3 element permission - if possible.
2893 ****************************************************************************/
2894
2895 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2896
2897 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2898 {
2899 int snum = SNUM(fsp->conn);
2900 size_t ace_count = count_canon_ace_list(file_ace_list);
2901 canon_ace *ace_p;
2902 canon_ace *owner_ace = NULL;
2903 canon_ace *group_ace = NULL;
2904 canon_ace *other_ace = NULL;
2905 mode_t and_bits;
2906 mode_t or_bits;
2907
2908 if (ace_count != 3) {
2909 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2910 posix perms.\n", fsp->fsp_name ));
2911 return False;
2912 }
2913
2914 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2915 if (ace_p->owner_type == UID_ACE)
2916 owner_ace = ace_p;
2917 else if (ace_p->owner_type == GID_ACE)
2918 group_ace = ace_p;
2919 else if (ace_p->owner_type == WORLD_ACE)
2920 other_ace = ace_p;
2921 }
2922
2923 if (!owner_ace || !group_ace || !other_ace) {
2924 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2925 fsp->fsp_name ));
2926 return False;
2927 }
2928
2929 *posix_perms = (mode_t)0;
2930
2931 *posix_perms |= owner_ace->perms;
2932 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2933 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2934 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2935 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2936 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2937 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2938
2939 /* The owner must have at least read access. */
2940
2941 *posix_perms |= S_IRUSR;
2942 if (fsp->is_directory)
2943 *posix_perms |= (S_IWUSR|S_IXUSR);
2944
2945 /* If requested apply the masks. */
2946
2947 /* Get the initial bits to apply. */
2948
2949 if (fsp->is_directory) {
2950 and_bits = lp_dir_security_mask(snum);
2951 or_bits = lp_force_dir_security_mode(snum);
2952 } else {
2953 and_bits = lp_security_mask(snum);
2954 or_bits = lp_force_security_mode(snum);
2955 }
2956
2957 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2958
2959 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2960 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2961 fsp->fsp_name ));
2962
2963 return True;
2964 }
2965
2966 /****************************************************************************
2967 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2968 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2969 with CI|OI set so it is inherited and also applies to the directory.
2970 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2971 ****************************************************************************/
2972
2973 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2974 {
2975 size_t i, j;
2976
2977 for (i = 0; i < num_aces; i++) {
2978 for (j = i+1; j < num_aces; j++) {
2979 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2980 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2981 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2982 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2983
2984 /* We know the lower number ACE's are file entries. */
2985 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2986 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2987 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2988 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2989 (i_inh == j_inh) &&
2990 (i_flags_ni == 0) &&
2991 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2992 SEC_ACE_FLAG_CONTAINER_INHERIT|
2993 SEC_ACE_FLAG_INHERIT_ONLY))) {
2994 /*
2995 * W2K wants to have access allowed zero access ACE's
2996 * at the end of the list. If the mask is zero, merge
2997 * the non-inherited ACE onto the inherited ACE.
2998 */
2999
3000 if (nt_ace_list[i].access_mask == 0) {
3001 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3002 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3003 if (num_aces - i - 1 > 0)
3004 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3005 sizeof(SEC_ACE));
3006
3007 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3008 (unsigned int)i, (unsigned int)j ));
3009 } else {
3010 /*
3011 * These are identical except for the flags.
3012 * Merge the inherited ACE onto the non-inherited ACE.
3013 */
3014
3015 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3016 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3017 if (num_aces - j - 1 > 0)
3018 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3019 sizeof(SEC_ACE));
3020
3021 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3022 (unsigned int)j, (unsigned int)i ));
3023 }
3024 num_aces--;
3025 break;
3026 }
3027 }
3028 }
3029
3030 return num_aces;
3031 }
3032
3033 /*
3034 * Add or Replace ACE entry.
3035 * In some cases we need to add a specific ACE for compatibility reasons.
3036 * When doing that we must make sure we are not actually creating a duplicate
3037 * entry. So we need to search whether an ACE entry already exist and eventually
3038 * replacce the access mask, or add a completely new entry if none was found.
3039 *
3040 * This function assumes the array has enough space to add a new entry without
3041 * any reallocation of memory.
3042 */
3043
3044 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3045 const DOM_SID *sid, enum security_ace_type type,
3046 uint32_t mask, uint8_t flags)
3047 {
3048 int i;
3049
3050 /* first search for a duplicate */
3051 for (i = 0; i < *num_aces; i++) {
3052 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3053 (nt_ace_list[i].flags == flags)) break;
3054 }
3055
3056 if (i < *num_aces) { /* found */
3057 nt_ace_list[i].type = type;
3058 nt_ace_list[i].access_mask = mask;
3059 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3060 i, sid_string_dbg(sid), flags));
3061 return;
3062 }
3063
3064 /* not found, append it */
3065 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3066 }
3067
3068
3069 /****************************************************************************
3070 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3071 the space for the return elements and returns the size needed to return the
3072 security descriptor. This should be the only external function needed for
3073 the UNIX style get ACL.
3074 ****************************************************************************/
3075
3076 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3077 const char *name,
3078 const SMB_STRUCT_STAT *sbuf,
3079 struct pai_val *pal,
3080 SMB_ACL_T posix_acl,
3081 SMB_ACL_T def_acl,
3082 uint32_t security_info,
3083 SEC_DESC **ppdesc)
3084 {
3085 DOM_SID owner_sid;
3086 DOM_SID group_sid;
3087 size_t sd_size = 0;
3088 SEC_ACL *psa = NULL;
3089 size_t num_acls = 0;
3090 size_t num_def_acls = 0;
3091 size_t num_aces = 0;
3092 canon_ace *file_ace = NULL;
3093 canon_ace *dir_ace = NULL;
3094 SEC_ACE *nt_ace_list = NULL;
3095 size_t num_profile_acls = 0;
3096 DOM_SID orig_owner_sid;
3097 SEC_DESC *psd = NULL;
3098 int i;
3099
3100 /*
3101 * Get the owner, group and world SIDs.
3102 */
3103
3104 create_file_sids(sbuf, &owner_sid, &group_sid);
3105
3106 if (lp_profile_acls(SNUM(conn))) {
3107 /* For WXP SP1 the owner must be administrators. */
3108 sid_copy(&orig_owner_sid, &owner_sid);
3109 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3110 sid_copy(&group_sid, &global_sid_Builtin_Users);
3111 num_profile_acls = 3;
3112 }
3113
3114 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3115
3116 /*
3117 * In the optimum case Creator Owner and Creator Group would be used for
3118 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3119 * would lead to usability problems under Windows: The Creator entries
3120 * are only available in browse lists of directories and not for files;
3121 * additionally the identity of the owning group couldn't be determined.
3122 * We therefore use those identities only for Default ACLs.
3123 */
3124
3125 /* Create the canon_ace lists. */
3126 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3127 &owner_sid, &group_sid, pal,
3128 SMB_ACL_TYPE_ACCESS);
3129
3130 /* We must have *some* ACLS. */
3131
3132 if (count_canon_ace_list(file_ace) == 0) {
3133 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3134 goto done;
3135 }
3136
3137 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3138 dir_ace = canonicalise_acl(conn, name, def_acl,
3139 sbuf,
3140 &global_sid_Creator_Owner,
3141 &global_sid_Creator_Group,
3142 pal, SMB_ACL_TYPE_DEFAULT);
3143 }
3144
3145 /*
3146 * Create the NT ACE list from the canonical ace lists.
3147 */
3148
3149 {
3150 canon_ace *ace;
3151 enum security_ace_type nt_acl_type;
3152
3153 if (nt4_compatible_acls() && dir_ace) {
3154 /*
3155 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3156 * but no non-INHERIT_ONLY entry for one SID. So we only
3157 * remove entries from the Access ACL if the
3158 * corresponding Default ACL entries have also been
3159 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3160 * are exceptions. We can do nothing
3161 * intelligent if the Default ACL contains entries that
3162 * are not also contained in the Access ACL, so this
3163 * case will still fail under NT 4.
3164 */
3165
3166 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3167 if (ace && !ace->perms) {
3168 DLIST_REMOVE(dir_ace, ace);
3169 SAFE_FREE(ace);
3170
3171 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3172 if (ace && !ace->perms) {
3173 DLIST_REMOVE(file_ace, ace);
3174 SAFE_FREE(ace);
3175 }
3176 }
3177
3178 /*
3179 * WinNT doesn't usually have Creator Group
3180 * in browse lists, so we send this entry to
3181 * WinNT even if it contains no relevant
3182 * permissions. Once we can add
3183 * Creator Group to browse lists we can
3184 * re-enable this.
3185 */
3186
3187 #if 0
3188 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3189 if (ace && !ace->perms) {
3190 DLIST_REMOVE(dir_ace, ace);
3191 SAFE_FREE(ace);
3192 }
3193 #endif
3194
3195 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3196 if (ace && !ace->perms) {
3197 DLIST_REMOVE(file_ace, ace);
3198 SAFE_FREE(ace);
3199 }
3200 }
3201
3202 num_acls = count_canon_ace_list(file_ace);
3203 num_def_acls = count_canon_ace_list(dir_ace);
3204
3205 /* Allocate the ace list. */
3206 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3207 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3208 goto done;
3209 }
3210
3211 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3212
3213 /*
3214 * Create the NT ACE list from the canonical ace lists.
3215 */
3216
3217 for (ace = file_ace; ace != NULL; ace = ace->next) {
3218 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3219 &nt_acl_type,
3220 ace->perms,
3221 S_ISDIR(sbuf->st_ex_mode));
3222 init_sec_ace(&nt_ace_list[num_aces++],
3223 &ace->trustee,
3224 nt_acl_type,
3225 acc,
3226 ace->ace_flags);
3227 }
3228
3229 /* The User must have access to a profile share - even
3230 * if we can't map the SID. */
3231 if (lp_profile_acls(SNUM(conn))) {
3232 add_or_replace_ace(nt_ace_list, &num_aces,
3233 &global_sid_Builtin_Users,
3234 SEC_ACE_TYPE_ACCESS_ALLOWED,
3235 FILE_GENERIC_ALL, 0);
3236 }
3237
3238 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3239 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3240 &nt_acl_type,
3241 ace->perms,
3242 S_ISDIR(sbuf->st_ex_mode));
3243 init_sec_ace(&nt_ace_list[num_aces++],
3244 &ace->trustee,
3245 nt_acl_type,
3246 acc,
3247 ace->ace_flags |
3248 SEC_ACE_FLAG_OBJECT_INHERIT|
3249 SEC_ACE_FLAG_CONTAINER_INHERIT|
3250 SEC_ACE_FLAG_INHERIT_ONLY);
3251 }
3252
3253 /* The User must have access to a profile share - even
3254 * if we can't map the SID. */
3255 if (lp_profile_acls(SNUM(conn))) {
3256 add_or_replace_ace(nt_ace_list, &num_aces,
3257 &global_sid_Builtin_Users,
3258 SEC_ACE_TYPE_ACCESS_ALLOWED,
3259 FILE_GENERIC_ALL,
3260 SEC_ACE_FLAG_OBJECT_INHERIT |
3261 SEC_ACE_FLAG_CONTAINER_INHERIT |
3262 SEC_ACE_FLAG_INHERIT_ONLY);
3263 }
3264
3265 /*
3266 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3267 * Win2K needs this to get the inheritance correct when replacing ACLs
3268 * on a directory tree. Based on work by Jim @ IBM.
3269 */
3270
3271 num_aces = merge_default_aces(nt_ace_list, num_aces);
3272
3273 if (lp_profile_acls(SNUM(conn))) {
3274 for (i = 0; i < num_aces; i++) {
3275 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3276 add_or_replace_ace(nt_ace_list, &num_aces,
3277 &orig_owner_sid,
3278 nt_ace_list[i].type,
3279 nt_ace_list[i].access_mask,
3280 nt_ace_list[i].flags);
3281 break;
3282 }
3283 }
3284 }
3285 }
3286
3287 if (num_aces) {
3288 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3289 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3290 goto done;
3291 }
3292 }
3293 } /* security_info & DACL_SECURITY_INFORMATION */
3294
3295 psd = make_standard_sec_desc( talloc_tos(),
3296 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3297 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3298 psa,
3299 &sd_size);
3300
3301 if(!psd) {
3302 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3303 sd_size = 0;
3304 goto done;
3305 }
3306
3307 /*
3308 * Windows 2000: The DACL_PROTECTED flag in the security
3309 * descriptor marks the ACL as non-inheriting, i.e., no
3310 * ACEs from higher level directories propagate to this
3311 * ACL. In the POSIX ACL model permissions are only
3312 * inherited at file create time, so ACLs never contain
3313 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3314 * flag doesn't seem to bother Windows NT.
3315 * Always set this if map acl inherit is turned off.
3316 */
3317 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3318 psd->type |= SEC_DESC_DACL_PROTECTED;
3319 } else {
3320 psd->type |= pal->sd_type;
3321 }
3322
3323 if (psd->dacl) {
3324 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3325 }
3326
3327 *ppdesc = psd;
3328
3329 done:
3330
3331 if (posix_acl) {
3332 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3333 }
3334 if (def_acl) {
3335 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3336 }
3337 free_canon_ace_list(file_ace);
3338 free_canon_ace_list(dir_ace);
3339 free_inherited_info(pal);
3340 SAFE_FREE(nt_ace_list);
3341
3342 return NT_STATUS_OK;
3343 }
3344
3345 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3346 SEC_DESC **ppdesc)
3347 {
3348 SMB_STRUCT_STAT sbuf;
3349 SMB_ACL_T posix_acl = NULL;
3350 struct pai_val *pal;
3351
3352 *ppdesc = NULL;
3353
3354 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3355
3356 /* can it happen that fsp_name == NULL ? */
3357 if (fsp->is_directory || fsp->fh->fd == -1) {
3358 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3359 security_info, ppdesc);
3360 }
3361
3362 /* Get the stat struct for the owner info. */
3363 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3364 return map_nt_error_from_unix(errno);
3365 }
3366
3367 /* Get the ACL from the fd. */
3368 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3369
3370 pal = fload_inherited_info(fsp);
3371
3372 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3373 posix_acl, NULL, security_info, ppdesc);
3374 }
3375
3376 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3377 uint32_t security_info, SEC_DESC **ppdesc)
3378 {
3379 SMB_STRUCT_STAT sbuf;
3380 SMB_ACL_T posix_acl = NULL;
3381 SMB_ACL_T def_acl = NULL;
3382 struct pai_val *pal;
3383
3384 *ppdesc = NULL;
3385
3386 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3387
3388 /* Get the stat struct for the owner info. */
3389 if(vfs_stat_smb_fname(conn, name, &sbuf) != 0) {
3390 return map_nt_error_from_unix(errno);
3391 }
3392
3393 /* Get the ACL from the path. */
3394 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3395
3396 /* If it's a directory get the default POSIX ACL. */
3397 if(S_ISDIR(sbuf.st_ex_mode)) {
3398 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3399 def_acl = free_empty_sys_acl(conn, def_acl);
3400 }
3401
3402 pal = load_inherited_info(conn, name);
3403
3404 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3405 def_acl, security_info, ppdesc);
3406 }
3407
3408 /****************************************************************************
3409 Try to chown a file. We will be able to chown it under the following conditions.
3410
3411 1) If we have root privileges, then it will just work.
3412 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3413 3) If we have SeRestorePrivilege we can change the user to any other user.
3414 4) If we have write permission to the file and dos_filemodes is set
3415 then allow chown to the currently authenticated user.
3416 ****************************************************************************/
3417
3418 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3419 uid_t uid, gid_t gid)
3420 {
3421 int ret;
3422 files_struct *fsp;
3423
3424 if(!CAN_WRITE(conn)) {
3425 return -1;
3426 }
3427
3428 /* Case (1). */
3429 /* try the direct way first */
3430 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3431 if (ret == 0)
3432 return 0;
3433
3434 /* Case (2) / (3) */
3435 if (lp_enable_privileges()) {
3436
3437 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3438 &se_take_ownership);
3439 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3440 &se_restore);
3441
3442 /* Case (2) */
3443 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3444 /* Case (3) */
3445 ( has_restore_priv ) ) {
3446
3447 become_root();
3448 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3449 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3450 (gid_t)-1);
3451 unbecome_root();
3452 return ret;
3453 }
3454 }
3455
3456 /* Case (4). */
3457 if (!lp_dos_filemode(SNUM(conn))) {
3458 errno = EPERM;
3459 return -1;
3460 }
3461
3462 /* only allow chown to the current user. This is more secure,
3463 and also copes with the case where the SID in a take ownership ACL is
3464 a local SID on the users workstation
3465 */
3466 if (uid != current_user.ut.uid) {
3467 errno = EPERM;
3468 return -1;
3469 }
3470
3471 if (SMB_VFS_STAT(conn, smb_fname)) {
3472 return -1;
3473 }
3474
3475 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3476 return -1;
3477 }
3478
3479 become_root();
3480 /* Keep the current file gid the same. */
3481 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3482 unbecome_root();
3483
3484 close_file_fchmod(NULL, fsp);
3485
3486 return ret;
3487 }
3488
3489 #if 0
3490 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3491
3492 /****************************************************************************
3493 Take care of parent ACL inheritance.
3494 ****************************************************************************/
3495
3496 NTSTATUS append_parent_acl(files_struct *fsp,
3497 const SEC_DESC *pcsd,
3498 SEC_DESC **pp_new_sd)
3499 {
3500 struct smb_filename *smb_dname = NULL;
3501 SEC_DESC *parent_sd = NULL;
3502 files_struct *parent_fsp = NULL;
3503 TALLOC_CTX *mem_ctx = talloc_tos();
3504 char *parent_name = NULL;
3505 SEC_ACE *new_ace = NULL;
3506 unsigned int num_aces = pcsd->dacl->num_aces;
3507 NTSTATUS status;
3508 int info;
3509 unsigned int i, j;
3510 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3511 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3512
3513 if (psd == NULL) {
3514 return NT_STATUS_NO_MEMORY;
3515 }
3516
3517 if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3518 return NT_STATUS_NO_MEMORY;
3519 }
3520
3521 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3522 &smb_dname);
3523 if (!NT_STATUS_IS_OK(status)) {
3524 goto fail;
3525 }
3526
3527 status = SMB_VFS_CREATE_FILE(
3528 fsp->conn, /* conn */
3529 NULL, /* req */
3530 0, /* root_dir_fid */
3531 smb_dname, /* fname */
3532 FILE_READ_ATTRIBUTES, /* access_mask */
3533 FILE_SHARE_NONE, /* share_access */
3534 FILE_OPEN, /* create_disposition*/
3535 FILE_DIRECTORY_FILE, /* create_options */
3536 0, /* file_attributes */
3537 INTERNAL_OPEN_ONLY, /* oplock_request */
3538 0, /* allocation_size */
3539 NULL, /* sd */
3540 NULL, /* ea_list */
3541 &parent_fsp, /* result */
3542 &info); /* pinfo */
3543
3544 if (!NT_STATUS_IS_OK(status)) {
3545 TALLOC_FREE(smb_dname);
3546 return status;
3547 }
3548
3549 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3550 DACL_SECURITY_INFORMATION, &parent_sd );
3551
3552 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3553 TALLOC_FREE(smb_dname);
3554
3555 if (!NT_STATUS_IS_OK(status)) {
3556 return status;
3557 }
3558
3559 /*
3560 * Make room for potentially all the ACLs from
3561 * the parent. We used to add the ugw triple here,
3562 * as we knew we were dealing with POSIX ACLs.
3563 * We no longer need to do so as we can guarentee
3564 * that a default ACL from the parent directory will
3565 * be well formed for POSIX ACLs if it came from a
3566 * POSIX ACL source, and if we're not writing to a
3567 * POSIX ACL sink then we don't care if it's not well
3568 * formed. JRA.
3569 */
3570
3571 num_aces += parent_sd->dacl->num_aces;
3572
3573 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3574 num_aces)) == NULL) {
3575 return NT_STATUS_NO_MEMORY;
3576 }
3577
3578 /* Start by copying in all the given ACE entries. */
3579 for (i = 0; i < psd->dacl->num_aces; i++) {
3580 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3581 }
3582
3583 /*
3584 * Note that we're ignoring "inherit permissions" here
3585 * as that really only applies to newly created files. JRA.
3586 */
3587
3588 /* Finally append any inherited ACEs. */
3589 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3590 SEC_ACE *se = &parent_sd->dacl->aces[j];
3591
3592 if (fsp->is_directory) {
3593 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3594 /* Doesn't apply to a directory - ignore. */
3595 DEBUG(10,("append_parent_acl: directory %s "
3596 "ignoring non container "
3597 "inherit flags %u on ACE with sid %s "
3598 "from parent %s\n",
3599 fsp->fsp_name,
3600 (unsigned int)se->flags,
3601 sid_string_dbg(&se->trustee),
3602 parent_name));
3603 continue;
3604 }
3605 } else {
3606 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3607 /* Doesn't apply to a file - ignore. */
3608 DEBUG(10,("append_parent_acl: file %s "
3609 "ignoring non object "
3610 "inherit flags %u on ACE with sid %s "
3611 "from parent %s\n",
3612 fsp->fsp_name,
3613 (unsigned int)se->flags,
3614 sid_string_dbg(&se->trustee),
3615 parent_name));
3616 continue;
3617 }
3618 }
3619
3620 if (is_dacl_protected) {
3621 /* If the DACL is protected it means we must
3622 * not overwrite an existing ACE entry with the
3623 * same SID. This is order N^2. Ouch :-(. JRA. */
3624 unsigned int k;
3625 for (k = 0; k < psd->dacl->num_aces; k++) {
3626 if (sid_equal(&psd->dacl->aces[k].trustee,
3627 &se->trustee)) {
3628 break;
3629 }
3630 }
3631 if (k < psd->dacl->num_aces) {
3632 /* SID matched. Ignore. */
3633 DEBUG(10,("append_parent_acl: path %s "
3634 "ignoring ACE with protected sid %s "
3635 "from parent %s\n",
3636 fsp->fsp_name,
3637 sid_string_dbg(&se->trustee),
3638 parent_name));
3639 continue;
3640 }
3641 }
3642
3643 sec_ace_copy(&new_ace[i], se);
3644 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3645 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3646 }
3647 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3648
3649 if (fsp->is_directory) {
3650 /*
3651 * Strip off any inherit only. It's applied.
3652 */
3653 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3654 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3655 /* No further inheritance. */
3656 new_ace[i].flags &=
3657 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3658 SEC_ACE_FLAG_OBJECT_INHERIT);
3659 }
3660 } else {
3661 /*
3662 * Strip off any container or inherit
3663 * flags, they can't apply to objects.
3664 */
3665 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3666 SEC_ACE_FLAG_INHERIT_ONLY|
3667 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3668 }
3669 i++;
3670
3671 DEBUG(10,("append_parent_acl: path %s "
3672 "inheriting ACE with sid %s "
3673 "from parent %s\n",
3674 fsp->fsp_name,
3675 sid_string_dbg(&se->trustee),
3676 parent_name));
3677 }
3678
3679 psd->dacl->aces = new_ace;
3680 psd->dacl->num_aces = i;
3681 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3682 SE_DESC_DACL_AUTO_INHERIT_REQ);
3683
3684 *pp_new_sd = psd;
3685 return status;
3686 }
3687 #endif
3688
3689 /****************************************************************************
3690 Reply to set a security descriptor on an fsp. security_info_sent is the
3691 description of the following NT ACL.
3692 This should be the only external function needed for the UNIX style set ACL.
3693 ****************************************************************************/
3694
3695 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3696 {
3697 connection_struct *conn = fsp->conn;
3698 uid_t user = (uid_t)-1;
3699 gid_t grp = (gid_t)-1;
3700 DOM_SID file_owner_sid;
3701 DOM_SID file_grp_sid;
3702 canon_ace *file_ace_list = NULL;
3703 canon_ace *dir_ace_list = NULL;
3704 bool acl_perms = False;
3705 mode_t orig_mode = (mode_t)0;
3706 NTSTATUS status;
3707 bool set_acl_as_root = false;
3708 bool acl_set_support = false;
3709 bool ret = false;
3710 struct smb_filename *smb_fname = NULL;
3711
3712 status = create_synthetic_smb_fname_split(talloc_tos(), fsp->fsp_name,
3713 NULL, &smb_fname);
3714 if (!NT_STATUS_IS_OK(status)) {
3715 goto out;
3716 }
3717
3718 DEBUG(10,("set_nt_acl: called for file %s\n",
3719 smb_fname_str_dbg(smb_fname)));
3720
3721 if (!CAN_WRITE(conn)) {
3722 DEBUG(10,("set acl rejected on read-only share\n"));
3723 status = NT_STATUS_MEDIA_WRITE_PROTECTED;
3724 goto out;
3725 }
3726
3727 /*
3728 * Get the current state of the file.
3729 */
3730
3731 if(fsp->is_directory || fsp->fh->fd == -1) {
3732 if(SMB_VFS_STAT(fsp->conn, smb_fname) != 0) {
3733 status = map_nt_error_from_unix(errno);
3734 goto out;
3735 }
3736 } else {
3737 if(SMB_VFS_FSTAT(fsp, &smb_fname->st) != 0) {
3738 status = map_nt_error_from_unix(errno);
3739 goto out;
3740 }
3741 }
3742
3743 /* Save the original element we check against. */
3744 orig_mode = smb_fname->st.st_ex_mode;
3745
3746 /*
3747 * Unpack the user/group/world id's.
3748 */
3749
3750 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3751 if (!NT_STATUS_IS_OK(status)) {
3752 goto out;
3753 }
3754
3755 /*
3756 * Do we need to chown ? If so this must be done first as the incoming
3757 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3758 * Noticed by Simo.
3759 */
3760
3761 if (((user != (uid_t)-1) && (smb_fname->st.st_ex_uid != user)) ||
3762 (( grp != (gid_t)-1) && (smb_fname->st.st_ex_gid != grp))) {
3763
3764 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3765 smb_fname_str_dbg(smb_fname), (unsigned int)user,
3766 (unsigned int)grp ));
3767
3768 if(try_chown(fsp->conn, smb_fname, user, grp) == -1) {
3769 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3770 "= %s.\n", smb_fname_str_dbg(smb_fname),
3771 (unsigned int)user, (unsigned int)grp,
3772 strerror(errno)));
3773 if (errno == EPERM) {
3774 status = NT_STATUS_INVALID_OWNER;
3775 goto out;
3776 }
3777 status = map_nt_error_from_unix(errno);
3778 goto out;
3779 }
3780
3781 /*
3782 * Recheck the current state of the file, which may have changed.
3783 * (suid/sgid bits, for instance)
3784 */
3785
3786 if(fsp->is_directory) {
3787 if(SMB_VFS_STAT(fsp->conn, smb_fname) != 0) {
3788 status = map_nt_error_from_unix(errno);
3789 goto out;
3790 }
3791 } else {
3792
3793 int sret;
3794
3795 if(fsp->fh->fd == -1)
3796 sret = SMB_VFS_STAT(fsp->conn, smb_fname);
3797 else
3798 sret = SMB_VFS_FSTAT(fsp, &smb_fname->st);
3799
3800 if(sret != 0)
3801 return map_nt_error_from_unix(errno);
3802 }
3803
3804 /* Save the original element we check against. */
3805 orig_mode = smb_fname->st.st_ex_mode;
3806
3807 /* If we successfully chowned, we know we must
3808 * be able to set the acl, so do it as root.
3809 */
3810 set_acl_as_root = true;
3811 }
3812
3813 create_file_sids(&smb_fname->st, &file_owner_sid, &file_grp_sid);
3814
3815 acl_perms = unpack_canon_ace(fsp, &smb_fname->st, &file_owner_sid,
3816 &file_grp_sid, &file_ace_list,
3817 &dir_ace_list, security_info_sent, psd);
3818
3819 /* Ignore W2K traverse DACL set. */
3820 if (!file_ace_list && !dir_ace_list) {
3821 status = NT_STATUS_OK;
3822 goto out;
3823 }
3824
3825 if (!acl_perms) {
3826 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3827 free_canon_ace_list(file_ace_list);
3828 free_canon_ace_list(dir_ace_list);
3829 status = NT_STATUS_ACCESS_DENIED;
3830 goto out;
3831 }
3832
3833 /*
3834 * Only change security if we got a DACL.
3835 */
3836
3837 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3838 free_canon_ace_list(file_ace_list);
3839 free_canon_ace_list(dir_ace_list);
3840 status = NT_STATUS_OK;
3841 goto out;
3842 }
3843
3844 /*
3845 * Try using the POSIX ACL set first. Fall back to chmod if
3846 * we have no ACL support on this filesystem.
3847 */
3848
3849 if (acl_perms && file_ace_list) {
3850 if (set_acl_as_root) {
3851 become_root();
3852 }
3853 ret = set_canon_ace_list(fsp, file_ace_list, false,
3854 &smb_fname->st, &acl_set_support);
3855 if (set_acl_as_root) {
3856 unbecome_root();
3857 }
3858 if (acl_set_support && ret == false) {
3859 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3860 "%s (%s).\n", smb_fname_str_dbg(smb_fname),
3861 strerror(errno)));
3862 free_canon_ace_list(file_ace_list);
3863 free_canon_ace_list(dir_ace_list);
3864 status = map_nt_error_from_unix(errno);
3865 goto out;
3866 }
3867 }
3868
3869 if (acl_perms && acl_set_support && fsp->is_directory) {
3870 if (dir_ace_list) {
3871 if (set_acl_as_root) {
3872 become_root();
3873 }
3874 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3875 &smb_fname->st,
3876 &acl_set_support);
3877 if (set_acl_as_root) {
3878 unbecome_root();
3879 }
3880 if (ret == false) {
3881 DEBUG(3,("set_nt_acl: failed to set default "
3882 "acl on directory %s (%s).\n",
3883 smb_fname_str_dbg(smb_fname),
3884 strerror(errno) ));
3885 free_canon_ace_list(file_ace_list);
3886 free_canon_ace_list(dir_ace_list);
3887 status = map_nt_error_from_unix(errno);
3888 goto out;
3889 }
3890 } else {
3891 int sret = -1;
3892
3893 /*
3894 * No default ACL - delete one if it exists.
3895 */
3896
3897 if (set_acl_as_root) {
3898 become_root();
3899 }
3900 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3901 smb_fname->base_name);
3902 if (set_acl_as_root) {
3903 unbecome_root();
3904 }
3905 if (sret == -1) {
3906 if (acl_group_override(conn, smb_fname)) {
3907 DEBUG(5,("set_nt_acl: acl group "
3908 "control on and current user "
3909 "in file %s primary group. "
3910 "Override delete_def_acl\n",
3911 smb_fname_str_dbg(smb_fname)));
3912
3913 become_root();
3914 sret =
3915 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3916 conn,
3917 smb_fname->base_name);
3918 unbecome_root();
3919 }
3920
3921 if (sret == -1) {
3922 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3923 free_canon_ace_list(file_ace_list);
3924 free_canon_ace_list(dir_ace_list);
3925 status = map_nt_error_from_unix(errno);
3926 goto out;
3927 }
3928 }
3929 }
3930 }
3931
3932 if (acl_set_support) {
3933 if (set_acl_as_root) {
3934 become_root();
3935 }
3936 store_inheritance_attributes(fsp,
3937 file_ace_list,
3938 dir_ace_list,
3939 psd->type);
3940 if (set_acl_as_root) {
3941 unbecome_root();
3942 }
3943 }
3944
3945 /*
3946 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3947 */
3948
3949 if(!acl_set_support && acl_perms) {
3950 mode_t posix_perms;
3951
3952 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3953 free_canon_ace_list(file_ace_list);
3954 free_canon_ace_list(dir_ace_list);
3955 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3956 "posix permissions for file %s.\n",
3957 smb_fname_str_dbg(smb_fname)));
3958 status = NT_STATUS_ACCESS_DENIED;
3959 goto out;
3960 }
3961
3962 if (orig_mode != posix_perms) {
3963 int sret = -1;
3964
3965 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3966 smb_fname_str_dbg(smb_fname),
3967 (unsigned int)posix_perms));
3968
3969 if (set_acl_as_root) {
3970 become_root();
3971 }
3972 sret = SMB_VFS_CHMOD(conn, smb_fname->base_name,
3973 posix_perms);
3974 if (set_acl_as_root) {
3975 unbecome_root();
3976 }
3977 if(sret == -1) {
3978 if (acl_group_override(conn, smb_fname)) {
3979 DEBUG(5,("set_nt_acl: acl group "
3980 "control on and current user "
3981 "in file %s primary group. "
3982 "Override chmod\n",
3983 smb_fname_str_dbg(smb_fname)));
3984
3985 become_root();
3986 sret =
3987 SMB_VFS_CHMOD(conn,
3988 smb_fname->base_name,
3989 posix_perms);
3990 unbecome_root();
3991 }
3992
3993 if (sret == -1) {
3994 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3995 "failed. Error = %s.\n",
3996 smb_fname_str_dbg(smb_fname),
3997 (unsigned int)posix_perms,
3998 strerror(errno)));
3999 free_canon_ace_list(file_ace_list);
4000 free_canon_ace_list(dir_ace_list);
4001 status = map_nt_error_from_unix(errno);
4002 goto out;
4003 }
4004 }
4005 }
4006 }
4007
4008 free_canon_ace_list(file_ace_list);
4009 free_canon_ace_list(dir_ace_list);
4010
4011 status = NT_STATUS_OK;
4012 out:
4013 TALLOC_FREE(smb_fname);
4014 return status;
4015 }
4016
4017 /****************************************************************************
4018 Get the actual group bits stored on a file with an ACL. Has no effect if
4019 the file has no ACL. Needed in dosmode code where the stat() will return
4020 the mask bits, not the real group bits, for a file with an ACL.
4021 ****************************************************************************/
4022
4023 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4024 {
4025 int entry_id = SMB_ACL_FIRST_ENTRY;
4026 SMB_ACL_ENTRY_T entry;
4027 SMB_ACL_T posix_acl;
4028 int result = -1;
4029
4030 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4031 if (posix_acl == (SMB_ACL_T)NULL)
4032 return -1;
4033
4034 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4035 SMB_ACL_TAG_T tagtype;
4036 SMB_ACL_PERMSET_T permset;
4037
4038 entry_id = SMB_ACL_NEXT_ENTRY;
4039
4040 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4041 break;
4042
4043 if (tagtype == SMB_ACL_GROUP_OBJ) {
4044 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4045 break;
4046 } else {
4047 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4048 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4049 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4050 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4051 result = 0;
4052 break;
4053 }
4054 }
4055 }
4056 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4057 return result;
4058 }
4059
4060 /****************************************************************************
4061 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4062 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4063 ****************************************************************************/
4064
4065 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4066 {
4067 int entry_id = SMB_ACL_FIRST_ENTRY;
4068 SMB_ACL_ENTRY_T entry;
4069 int num_entries = 0;
4070
4071 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4072 SMB_ACL_TAG_T tagtype;
4073 SMB_ACL_PERMSET_T permset;
4074 mode_t perms;
4075
4076 entry_id = SMB_ACL_NEXT_ENTRY;
4077
4078 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4079 return -1;
4080
4081 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4082 return -1;
4083
4084 num_entries++;
4085
4086 switch(tagtype) {
4087 case SMB_ACL_USER_OBJ:
4088 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4089 break;
4090 case SMB_ACL_GROUP_OBJ:
4091 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4092 break;
4093 case SMB_ACL_MASK:
4094 /*
4095 * FIXME: The ACL_MASK entry permissions should really be set to
4096 * the union of the permissions of all ACL_USER,
4097 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4098 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4099 */
4100 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4101 break;
4102 case SMB_ACL_OTHER:
4103 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4104 break;
4105 default:
4106 continue;
4107 }
4108
4109 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4110 return -1;
4111
4112 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4113 return -1;
4114 }
4115
4116 /*
4117 * If this is a simple 3 element ACL or no elements then it's a standard
4118 * UNIX permission set. Just use chmod...
4119 */
4120
4121 if ((num_entries == 3) || (num_entries == 0))
4122 return -1;
4123
4124 return 0;
4125 }
4126
4127 /****************************************************************************
4128 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4129 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4130 resulting ACL on TO. Note that name is in UNIX character set.
4131 ****************************************************************************/
4132
4133 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4134 {
4135 SMB_ACL_T posix_acl = NULL;
4136 int ret = -1;
4137
4138 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4139 return -1;
4140
4141 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4142 goto done;
4143
4144 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4145
4146 done:
4147
4148 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4149 return ret;
4150 }
4151
4152 /****************************************************************************
4153 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4154 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4155 Note that name is in UNIX character set.
4156 ****************************************************************************/
4157
4158 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4159 {
4160 return copy_access_posix_acl(conn, name, name, mode);
4161 }
4162
4163 /****************************************************************************
4164 Check for an existing default POSIX ACL on a directory.
4165 ****************************************************************************/
4166
4167 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4168 {
4169 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4170 bool has_acl = False;
4171 SMB_ACL_ENTRY_T entry;
4172
4173 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4174 has_acl = True;
4175 }
4176
4177 if (def_acl) {
4178 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4179 }
4180 return has_acl;
4181 }
4182
4183 /****************************************************************************
4184 If the parent directory has no default ACL but it does have an Access ACL,
4185 inherit this Access ACL to file name.
4186 ****************************************************************************/
4187
4188 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4189 const char *name, mode_t mode)
4190 {
4191 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4192 return 0;
4193
4194 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4195 }
4196
4197 /****************************************************************************
4198 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4199 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4200 ****************************************************************************/
4201
4202 int fchmod_acl(files_struct *fsp, mode_t mode)
4203 {
4204 connection_struct *conn = fsp->conn;
4205 SMB_ACL_T posix_acl = NULL;
4206 int ret = -1;
4207
4208 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4209 return -1;
4210
4211 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4212 goto done;
4213
4214 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4215
4216 done:
4217
4218 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4219 return ret;
4220 }
4221
4222 /****************************************************************************
4223 Map from wire type to permset.
4224 ****************************************************************************/
4225
4226 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4227 {
4228 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4229 return False;
4230 }
4231
4232 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4233 return False;
4234 }
4235
4236 if (wire_perm & SMB_POSIX_ACL_READ) {
4237 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4238 return False;
4239 }
4240 }
4241 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4242 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4243 return False;
4244 }
4245 }
4246 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4247 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4248 return False;
4249 }
4250 }
4251 return True;
4252 }
4253
4254 /****************************************************************************
4255 Map from wire type to tagtype.
4256 ****************************************************************************/
4257
4258 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4259 {
4260 switch (wire_tt) {
4261 case SMB_POSIX_ACL_USER_OBJ:
4262 *p_tt = SMB_ACL_USER_OBJ;
4263 break;
4264 case SMB_POSIX_ACL_USER:
4265 *p_tt = SMB_ACL_USER;
4266 break;
4267 case SMB_POSIX_ACL_GROUP_OBJ:
4268 *p_tt = SMB_ACL_GROUP_OBJ;
4269 break;
4270 case SMB_POSIX_ACL_GROUP:
4271 *p_tt = SMB_ACL_GROUP;
4272 break;
4273 case SMB_POSIX_ACL_MASK:
4274 *p_tt = SMB_ACL_MASK;
4275 break;
4276 case SMB_POSIX_ACL_OTHER:
4277 *p_tt = SMB_ACL_OTHER;
4278 break;
4279 default:
4280 return False;
4281 }
4282 return True;
4283 }
4284
4285 /****************************************************************************
4286 Create a new POSIX acl from wire permissions.
4287 FIXME ! How does the share mask/mode fit into this.... ?
4288 ****************************************************************************/
4289
4290 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4291 {
4292 unsigned int i;
4293 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4294
4295 if (the_acl == NULL) {
4296 return NULL;
4297 }
4298
4299 for (i = 0; i < num_acls; i++) {
4300 SMB_ACL_ENTRY_T the_entry;
4301 SMB_ACL_PERMSET_T the_permset;
4302 SMB_ACL_TAG_T tag_type;
4303
4304 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4305 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4306 i, strerror(errno) ));
4307 goto fail;
4308 }
4309
4310 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4311 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4312 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4313 goto fail;
4314 }
4315
4316 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4317 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4318 i, strerror(errno) ));
4319 goto fail;
4320 }
4321
4322 /* Get the permset pointer from the new ACL entry. */
4323 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4324 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4325 i, strerror(errno) ));
4326 goto fail;
4327 }
4328
4329 /* Map from wire to permissions. */
4330 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4331 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4332 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4333 goto fail;
4334 }
4335
4336 /* Now apply to the new ACL entry. */
4337 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4338 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4339 i, strerror(errno) ));
4340 goto fail;
4341 }
4342
4343 if (tag_type == SMB_ACL_USER) {
4344 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4345 uid_t uid = (uid_t)uidval;
4346 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4347 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4348 (unsigned int)uid, i, strerror(errno) ));
4349 goto fail;
4350 }
4351 }
4352
4353 if (tag_type == SMB_ACL_GROUP) {
4354 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4355 gid_t gid = (uid_t)gidval;
4356 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4357 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4358 (unsigned int)gid, i, strerror(errno) ));
4359 goto fail;
4360 }
4361 }
4362 }
4363
4364 return the_acl;
4365
4366 fail:
4367
4368 if (the_acl != NULL) {
4369 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4370 }
4371 return NULL;
4372 }
4373
4374 /****************************************************************************
4375 Calls from UNIX extensions - Default POSIX ACL set.
4376 If num_def_acls == 0 and not a directory just return. If it is a directory
4377 and num_def_acls == 0 then remove the default acl. Else set the default acl
4378 on the directory.
4379 ****************************************************************************/
4380
4381 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4382 uint16 num_def_acls, const char *pdata)
4383 {
4384 SMB_ACL_T def_acl = NULL;
4385
4386 if (!S_ISDIR(psbuf->st_ex_mode)) {
4387 if (num_def_acls) {
4388 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4389 errno = EISDIR;
4390 return False;
4391 } else {
4392 return True;
4393 }
4394 }
4395
4396 if (!num_def_acls) {
4397 /* Remove the default ACL. */
4398 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4399 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4400 fname, strerror(errno) ));
4401 return False;
4402 }
4403 return True;
4404 }
4405
4406 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4407 return False;
4408 }
4409
4410 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4411 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4412 fname, strerror(errno) ));
4413 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4414 return False;
4415 }
4416
4417 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4418 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4419 return True;
4420 }
4421
4422 /****************************************************************************
4423 Remove an ACL from a file. As we don't have acl_delete_entry() available
4424 we must read the current acl and copy all entries except MASK, USER and GROUP
4425 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4426 removed.
4427 FIXME ! How does the share mask/mode fit into this.... ?
4428 ****************************************************************************/
4429
4430 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4431 {
4432 SMB_ACL_T file_acl = NULL;
4433 int entry_id = SMB_ACL_FIRST_ENTRY;
4434 SMB_ACL_ENTRY_T entry;
4435 bool ret = False;
4436 /* Create a new ACL with only 3 entries, u/g/w. */
4437 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4438 SMB_ACL_ENTRY_T user_ent = NULL;
4439 SMB_ACL_ENTRY_T group_ent = NULL;
4440 SMB_ACL_ENTRY_T other_ent = NULL;
4441
4442 if (new_file_acl == NULL) {
4443 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4444 return False;
4445 }
4446
4447 /* Now create the u/g/w entries. */
4448 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4449 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4450 fname, strerror(errno) ));
4451 goto done;
4452 }
4453 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4454 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4455 fname, strerror(errno) ));
4456 goto done;
4457 }
4458
4459 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4460 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4461 fname, strerror(errno) ));
4462 goto done;
4463 }
4464 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4465 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4466 fname, strerror(errno) ));
4467 goto done;
4468 }
4469
4470 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4471 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4472 fname, strerror(errno) ));
4473 goto done;
4474 }
4475 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4476 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4477 fname, strerror(errno) ));
4478 goto done;
4479 }
4480
4481 /* Get the current file ACL. */
4482 if (fsp && fsp->fh->fd != -1) {
4483 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4484 } else {
4485 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4486 }
4487
4488 if (file_acl == NULL) {
4489 /* This is only returned if an error occurred. Even for a file with
4490 no acl a u/g/w acl should be returned. */
4491 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4492 fname, strerror(errno) ));
4493 goto done;
4494 }
4495
4496 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4497 SMB_ACL_TAG_T tagtype;
4498 SMB_ACL_PERMSET_T permset;
4499
4500 entry_id = SMB_ACL_NEXT_ENTRY;
4501
4502 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4503 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4504 fname, strerror(errno) ));
4505 goto done;
4506 }
4507
4508 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4509 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4510 fname, strerror(errno) ));
4511 goto done;
4512 }
4513
4514 if (tagtype == SMB_ACL_USER_OBJ) {
4515 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4516 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4517 fname, strerror(errno) ));
4518 }
4519 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4520 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4521 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4522 fname, strerror(errno) ));
4523 }
4524 } else if (tagtype == SMB_ACL_OTHER) {
4525 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4526 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4527 fname, strerror(errno) ));
4528 }
4529 }
4530 }
4531
4532 /* Set the new empty file ACL. */
4533 if (fsp && fsp->fh->fd != -1) {
4534 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4535 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4536 fname, strerror(errno) ));
4537 goto done;
4538 }
4539 } else {
4540 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4541 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4542 fname, strerror(errno) ));
4543 goto done;
4544 }
4545 }
4546
4547 ret = True;
4548
4549 done:
4550
4551 if (file_acl) {
4552 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4553 }
4554 if (new_file_acl) {
4555 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4556 }
4557 return ret;
4558 }
4559
4560 /****************************************************************************
4561 Calls from UNIX extensions - POSIX ACL set.
4562 If num_def_acls == 0 then read/modify/write acl after removing all entries
4563 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4564 ****************************************************************************/
4565
4566 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4567 {
4568 SMB_ACL_T file_acl = NULL;
4569
4570 if (!num_acls) {
4571 /* Remove the ACL from the file. */
4572 return remove_posix_acl(conn, fsp, fname);
4573 }
4574
4575 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4576 return False;
4577 }
4578
4579 if (fsp && fsp->fh->fd != -1) {
4580 /* The preferred way - use an open fd. */
4581 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4582 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4583 fname, strerror(errno) ));
4584 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4585 return False;
4586 }
4587 } else {
4588 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4589 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4590 fname, strerror(errno) ));
4591 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4592 return False;
4593 }
4594 }
4595
4596 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4597 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4598 return True;
4599 }
4600
4601 /********************************************************************
4602 Pull the NT ACL from a file on disk or the OpenEventlog() access
4603 check. Caller is responsible for freeing the returned security
4604 descriptor via TALLOC_FREE(). This is designed for dealing with
4605 user space access checks in smbd outside of the VFS. For example,
4606 checking access rights in OpenEventlog().
4607
4608 Assume we are dealing with files (for now)
4609 ********************************************************************/
4610
4611 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4612 {
4613 SEC_DESC *psd, *ret_sd;
4614 connection_struct *conn;
4615 files_struct finfo;
4616 struct fd_handle fh;
4617
4618 conn = TALLOC_ZERO_P(ctx, connection_struct);
4619 if (conn == NULL) {
4620 DEBUG(0, ("talloc failed\n"));
4621 return NULL;
4622 }
4623
4624 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4625 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4626 TALLOC_FREE(conn);
4627 return NULL;
4628 }
4629
4630 conn->params->service = -1;
4631
4632 set_conn_connectpath(conn, "/");
4633
4634 if (!smbd_vfs_init(conn)) {
4635 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4636 conn_free_internal( conn );
4637 return NULL;
4638 }
4639
4640 ZERO_STRUCT( finfo );
4641 ZERO_STRUCT( fh );
4642
4643 finfo.fnum = -1;
4644 finfo.conn = conn;
4645 finfo.fh = &fh;
4646 finfo.fh->fd = -1;
4647 finfo.fsp_name = CONST_DISCARD(char *,fname);
4648
4649 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4650 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4651 conn_free_internal( conn );
4652 return NULL;
4653 }
4654
4655 ret_sd = dup_sec_desc( ctx, psd );
4656
4657 conn_free_internal( conn );
4658
4659 return ret_sd;
4660 }
fernandojvsilva's samba4 branch