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Rever e80ceb1d7355c8c46a2ed90d5721cf367640f4e8 "Remove more uses of "extern struct...
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blob2fb7b77c861fb78fca187f57e93242f9dad50183
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 unsigned int i;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 num_entries++;
188 }
189
190 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
191 num_def_entries++;
192 }
193
194 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
195
196 *store_size = PAI_V2_ENTRIES_BASE +
197 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
198
199 pai_buf = (char *)SMB_MALLOC(*store_size);
200 if (!pai_buf) {
201 return NULL;
202 }
203
204 /* Set up the header. */
205 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
206 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
207 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
208 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
209 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
210
211 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
212 (unsigned int)sd_type ));
213
214 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
215
216 i = 0;
217 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
218 uint8_t type_val = (uint8_t)ace_list->owner_type;
219 uint32_t entry_val = get_entry_val(ace_list);
220
221 SCVAL(entry_offset,0,ace_list->ace_flags);
222 SCVAL(entry_offset,1,type_val);
223 SIVAL(entry_offset,2,entry_val);
224 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
225 i,
226 (unsigned int)ace_list->ace_flags,
227 (unsigned int)type_val,
228 (unsigned int)entry_val ));
229 i++;
230 entry_offset += PAI_V2_ENTRY_LENGTH;
231 }
232
233 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
234 uint8_t type_val = (uint8_t)ace_list->owner_type;
235 uint32_t entry_val = get_entry_val(ace_list);
236
237 SCVAL(entry_offset,0,ace_list->ace_flags);
238 SCVAL(entry_offset,1,type_val);
239 SIVAL(entry_offset,2,entry_val);
240 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
241 i,
242 (unsigned int)ace_list->ace_flags,
243 (unsigned int)type_val,
244 (unsigned int)entry_val ));
245 i++;
246 entry_offset += PAI_V2_ENTRY_LENGTH;
247 }
248
249 return pai_buf;
250 }
251
252 /************************************************************************
253 Store the user.SAMBA_PAI attribute on disk.
254 ************************************************************************/
255
256 static void store_inheritance_attributes(files_struct *fsp,
257 canon_ace *file_ace_list,
258 canon_ace *dir_ace_list,
259 uint16_t sd_type)
260 {
261 int ret;
262 size_t store_size;
263 char *pai_buf;
264
265 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
266 return;
267 }
268
269 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
270 sd_type, &store_size);
271
272 if (fsp->fh->fd != -1) {
273 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
274 pai_buf, store_size, 0);
275 } else {
276 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
277 SAMBA_POSIX_INHERITANCE_EA_NAME,
278 pai_buf, store_size, 0);
279 }
280
281 SAFE_FREE(pai_buf);
282
283 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
284 (unsigned int)sd_type,
285 fsp_str_dbg(fsp)));
286
287 if (ret == -1 && !no_acl_syscall_error(errno)) {
288 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
289 }
290 }
291
292 /************************************************************************
293 Delete the in memory inheritance info.
294 ************************************************************************/
295
296 static void free_inherited_info(struct pai_val *pal)
297 {
298 if (pal) {
299 struct pai_entry *paie, *paie_next;
300 for (paie = pal->entry_list; paie; paie = paie_next) {
301 paie_next = paie->next;
302 SAFE_FREE(paie);
303 }
304 for (paie = pal->def_entry_list; paie; paie = paie_next) {
305 paie_next = paie->next;
306 SAFE_FREE(paie);
307 }
308 SAFE_FREE(pal);
309 }
310 }
311
312 /************************************************************************
313 Get any stored ACE flags.
314 ************************************************************************/
315
316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
317 {
318 struct pai_entry *paie;
319
320 if (!pal) {
321 return 0;
322 }
323
324 /* If the entry exists it is inherited. */
325 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
326 if (ace_entry->owner_type == paie->owner_type &&
327 get_entry_val(ace_entry) == get_pai_entry_val(paie))
328 return paie->ace_flags;
329 }
330 return 0;
331 }
332
333 /************************************************************************
334 Ensure an attribute just read is valid - v1.
335 ************************************************************************/
336
337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
338 {
339 uint16 num_entries;
340 uint16 num_def_entries;
341
342 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
343 /* Corrupted - too small. */
344 return false;
345 }
346
347 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
348 return false;
349 }
350
351 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
352 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
353
354 /* Check the entry lists match. */
355 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
356
357 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
358 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
359 return false;
360 }
361
362 return true;
363 }
364
365 /************************************************************************
366 Ensure an attribute just read is valid - v2.
367 ************************************************************************/
368
369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
370 {
371 uint16 num_entries;
372 uint16 num_def_entries;
373
374 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
375 /* Corrupted - too small. */
376 return false;
377 }
378
379 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
380 return false;
381 }
382
383 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
384 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
385
386 /* Check the entry lists match. */
387 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
388
389 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
390 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
391 return false;
392 }
393
394 return true;
395 }
396
397 /************************************************************************
398 Decode the owner.
399 ************************************************************************/
400
401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
402 {
403 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
404 switch( paie->owner_type) {
405 case UID_ACE:
406 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
407 DEBUG(10,("get_pai_owner_type: uid = %u\n",
408 (unsigned int)paie->unix_ug.uid ));
409 break;
410 case GID_ACE:
411 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412 DEBUG(10,("get_pai_owner_type: gid = %u\n",
413 (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("get_pai_owner_type: world ace\n"));
418 break;
419 default:
420 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
421 (unsigned int)paie->owner_type ));
422 return false;
423 }
424 return true;
425 }
426
427 /************************************************************************
428 Process v2 entries.
429 ************************************************************************/
430
431 static const char *create_pai_v1_entries(struct pai_val *paiv,
432 const char *entry_offset,
433 bool def_entry)
434 {
435 int i;
436
437 for (i = 0; i < paiv->num_entries; i++) {
438 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
439 if (!paie) {
440 return NULL;
441 }
442
443 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
444 if (!get_pai_owner_type(paie, entry_offset)) {
445 return NULL;
446 }
447
448 if (!def_entry) {
449 DLIST_ADD(paiv->entry_list, paie);
450 } else {
451 DLIST_ADD(paiv->def_entry_list, paie);
452 }
453 entry_offset += PAI_V1_ENTRY_LENGTH;
454 }
455 return entry_offset;
456 }
457
458 /************************************************************************
459 Convert to in-memory format from version 1.
460 ************************************************************************/
461
462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
463 {
464 const char *entry_offset;
465 struct pai_val *paiv = NULL;
466
467 if (!check_pai_ok_v1(buf, size)) {
468 return NULL;
469 }
470
471 paiv = SMB_MALLOC_P(struct pai_val);
472 if (!paiv) {
473 return NULL;
474 }
475
476 memset(paiv, '\0', sizeof(struct pai_val));
477
478 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
479 SE_DESC_DACL_PROTECTED : 0;
480
481 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
482 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
483
484 entry_offset = buf + PAI_V1_ENTRIES_BASE;
485
486 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
487 paiv->num_entries, paiv->num_def_entries ));
488
489 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
490 if (entry_offset == NULL) {
491 free_inherited_info(paiv);
492 return NULL;
493 }
494 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
495 if (entry_offset == NULL) {
496 free_inherited_info(paiv);
497 return NULL;
498 }
499
500 return paiv;
501 }
502
503 /************************************************************************
504 Process v2 entries.
505 ************************************************************************/
506
507 static const char *create_pai_v2_entries(struct pai_val *paiv,
508 unsigned int num_entries,
509 const char *entry_offset,
510 bool def_entry)
511 {
512 unsigned int i;
513
514 for (i = 0; i < num_entries; i++) {
515 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
516 if (!paie) {
517 return NULL;
518 }
519
520 paie->ace_flags = CVAL(entry_offset,0);
521
522 if (!get_pai_owner_type(paie, entry_offset+1)) {
523 return NULL;
524 }
525 if (!def_entry) {
526 DLIST_ADD(paiv->entry_list, paie);
527 } else {
528 DLIST_ADD(paiv->def_entry_list, paie);
529 }
530 entry_offset += PAI_V2_ENTRY_LENGTH;
531 }
532 return entry_offset;
533 }
534
535 /************************************************************************
536 Convert to in-memory format from version 2.
537 ************************************************************************/
538
539 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
540 {
541 const char *entry_offset;
542 struct pai_val *paiv = NULL;
543
544 if (!check_pai_ok_v2(buf, size)) {
545 return NULL;
546 }
547
548 paiv = SMB_MALLOC_P(struct pai_val);
549 if (!paiv) {
550 return NULL;
551 }
552
553 memset(paiv, '\0', sizeof(struct pai_val));
554
555 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
556
557 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
558 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
559
560 entry_offset = buf + PAI_V2_ENTRIES_BASE;
561
562 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
563 (unsigned int)paiv->sd_type,
564 paiv->num_entries, paiv->num_def_entries ));
565
566 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
567 entry_offset, false);
568 if (entry_offset == NULL) {
569 free_inherited_info(paiv);
570 return NULL;
571 }
572 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
573 entry_offset, true);
574 if (entry_offset == NULL) {
575 free_inherited_info(paiv);
576 return NULL;
577 }
578
579 return paiv;
580 }
581
582 /************************************************************************
583 Convert to in-memory format - from either version 1 or 2.
584 ************************************************************************/
585
586 static struct pai_val *create_pai_val(const char *buf, size_t size)
587 {
588 if (size < 1) {
589 return NULL;
590 }
591 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
592 return create_pai_val_v1(buf, size);
593 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
594 return create_pai_val_v2(buf, size);
595 } else {
596 return NULL;
597 }
598 }
599
600 /************************************************************************
601 Load the user.SAMBA_PAI attribute.
602 ************************************************************************/
603
604 static struct pai_val *fload_inherited_info(files_struct *fsp)
605 {
606 char *pai_buf;
607 size_t pai_buf_size = 1024;
608 struct pai_val *paiv = NULL;
609 ssize_t ret;
610
611 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
612 return NULL;
613 }
614
615 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
616 return NULL;
617 }
618
619 do {
620 if (fsp->fh->fd != -1) {
621 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
622 pai_buf, pai_buf_size);
623 } else {
624 ret = SMB_VFS_GETXATTR(fsp->conn,
625 fsp->fsp_name->base_name,
626 SAMBA_POSIX_INHERITANCE_EA_NAME,
627 pai_buf, pai_buf_size);
628 }
629
630 if (ret == -1) {
631 if (errno != ERANGE) {
632 break;
633 }
634 /* Buffer too small - enlarge it. */
635 pai_buf_size *= 2;
636 SAFE_FREE(pai_buf);
637 if (pai_buf_size > 1024*1024) {
638 return NULL; /* Limit malloc to 1mb. */
639 }
640 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
641 return NULL;
642 }
643 } while (ret == -1);
644
645 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
646 (unsigned long)ret, fsp_str_dbg(fsp)));
647
648 if (ret == -1) {
649 /* No attribute or not supported. */
650 #if defined(ENOATTR)
651 if (errno != ENOATTR)
652 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
653 #else
654 if (errno != ENOSYS)
655 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
656 #endif
657 SAFE_FREE(pai_buf);
658 return NULL;
659 }
660
661 paiv = create_pai_val(pai_buf, ret);
662
663 if (paiv) {
664 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
665 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
666 }
667
668 SAFE_FREE(pai_buf);
669 return paiv;
670 }
671
672 /************************************************************************
673 Load the user.SAMBA_PAI attribute.
674 ************************************************************************/
675
676 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
677 const char *fname)
678 {
679 char *pai_buf;
680 size_t pai_buf_size = 1024;
681 struct pai_val *paiv = NULL;
682 ssize_t ret;
683
684 if (!lp_map_acl_inherit(SNUM(conn))) {
685 return NULL;
686 }
687
688 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
689 return NULL;
690 }
691
692 do {
693 ret = SMB_VFS_GETXATTR(conn, fname,
694 SAMBA_POSIX_INHERITANCE_EA_NAME,
695 pai_buf, pai_buf_size);
696
697 if (ret == -1) {
698 if (errno != ERANGE) {
699 break;
700 }
701 /* Buffer too small - enlarge it. */
702 pai_buf_size *= 2;
703 SAFE_FREE(pai_buf);
704 if (pai_buf_size > 1024*1024) {
705 return NULL; /* Limit malloc to 1mb. */
706 }
707 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
708 return NULL;
709 }
710 } while (ret == -1);
711
712 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
713
714 if (ret == -1) {
715 /* No attribute or not supported. */
716 #if defined(ENOATTR)
717 if (errno != ENOATTR)
718 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
719 #else
720 if (errno != ENOSYS)
721 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
722 #endif
723 SAFE_FREE(pai_buf);
724 return NULL;
725 }
726
727 paiv = create_pai_val(pai_buf, ret);
728
729 if (paiv) {
730 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
731 (unsigned int)paiv->sd_type,
732 fname));
733 }
734
735 SAFE_FREE(pai_buf);
736 return paiv;
737 }
738
739 /****************************************************************************
740 Functions to manipulate the internal ACE format.
741 ****************************************************************************/
742
743 /****************************************************************************
744 Count a linked list of canonical ACE entries.
745 ****************************************************************************/
746
747 static size_t count_canon_ace_list( canon_ace *l_head )
748 {
749 size_t count = 0;
750 canon_ace *ace;
751
752 for (ace = l_head; ace; ace = ace->next)
753 count++;
754
755 return count;
756 }
757
758 /****************************************************************************
759 Free a linked list of canonical ACE entries.
760 ****************************************************************************/
761
762 static void free_canon_ace_list( canon_ace *l_head )
763 {
764 canon_ace *list, *next;
765
766 for (list = l_head; list; list = next) {
767 next = list->next;
768 DLIST_REMOVE(l_head, list);
769 SAFE_FREE(list);
770 }
771 }
772
773 /****************************************************************************
774 Function to duplicate a canon_ace entry.
775 ****************************************************************************/
776
777 static canon_ace *dup_canon_ace( canon_ace *src_ace)
778 {
779 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
780
781 if (dst_ace == NULL)
782 return NULL;
783
784 *dst_ace = *src_ace;
785 dst_ace->prev = dst_ace->next = NULL;
786 return dst_ace;
787 }
788
789 /****************************************************************************
790 Print out a canon ace.
791 ****************************************************************************/
792
793 static void print_canon_ace(canon_ace *pace, int num)
794 {
795 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
796 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
797 if (pace->owner_type == UID_ACE) {
798 const char *u_name = uidtoname(pace->unix_ug.uid);
799 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
800 } else if (pace->owner_type == GID_ACE) {
801 char *g_name = gidtoname(pace->unix_ug.gid);
802 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
803 } else
804 dbgtext( "other ");
805 switch (pace->type) {
806 case SMB_ACL_USER:
807 dbgtext( "SMB_ACL_USER ");
808 break;
809 case SMB_ACL_USER_OBJ:
810 dbgtext( "SMB_ACL_USER_OBJ ");
811 break;
812 case SMB_ACL_GROUP:
813 dbgtext( "SMB_ACL_GROUP ");
814 break;
815 case SMB_ACL_GROUP_OBJ:
816 dbgtext( "SMB_ACL_GROUP_OBJ ");
817 break;
818 case SMB_ACL_OTHER:
819 dbgtext( "SMB_ACL_OTHER ");
820 break;
821 default:
822 dbgtext( "MASK " );
823 break;
824 }
825
826 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
827 dbgtext( "perms ");
828 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
829 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
830 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
831 }
832
833 /****************************************************************************
834 Print out a canon ace list.
835 ****************************************************************************/
836
837 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
838 {
839 int count = 0;
840
841 if( DEBUGLVL( 10 )) {
842 dbgtext( "print_canon_ace_list: %s\n", name );
843 for (;ace_list; ace_list = ace_list->next, count++)
844 print_canon_ace(ace_list, count );
845 }
846 }
847
848 /****************************************************************************
849 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
850 ****************************************************************************/
851
852 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
853 {
854 mode_t ret = 0;
855
856 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
857 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
858 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
859
860 return ret;
861 }
862
863 /****************************************************************************
864 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
865 ****************************************************************************/
866
867 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
868 {
869 mode_t ret = 0;
870
871 if (mode & r_mask)
872 ret |= S_IRUSR;
873 if (mode & w_mask)
874 ret |= S_IWUSR;
875 if (mode & x_mask)
876 ret |= S_IXUSR;
877
878 return ret;
879 }
880
881 /****************************************************************************
882 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
883 an SMB_ACL_PERMSET_T.
884 ****************************************************************************/
885
886 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
887 {
888 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
889 return -1;
890 if (mode & S_IRUSR) {
891 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
892 return -1;
893 }
894 if (mode & S_IWUSR) {
895 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
896 return -1;
897 }
898 if (mode & S_IXUSR) {
899 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
900 return -1;
901 }
902 return 0;
903 }
904
905 /****************************************************************************
906 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
907 ****************************************************************************/
908
909 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
910 {
911 uid_to_sid( powner_sid, psbuf->st_ex_uid );
912 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
913 }
914
915 /****************************************************************************
916 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
917 delete the second one. If the first is deny, mask the permissions off and delete the allow
918 if the permissions become zero, delete the deny if the permissions are non zero.
919 ****************************************************************************/
920
921 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
922 {
923 canon_ace *l_head = *pp_list_head;
924 canon_ace *curr_ace_outer;
925 canon_ace *curr_ace_outer_next;
926
927 /*
928 * First, merge allow entries with identical SIDs, and deny entries
929 * with identical SIDs.
930 */
931
932 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
933 canon_ace *curr_ace;
934 canon_ace *curr_ace_next;
935
936 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
937
938 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
939 bool can_merge = false;
940
941 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
942
943 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
944 * types are the same. For directory acls we must also
945 * ensure the POSIX ACL types are the same. */
946
947 if (!dir_acl) {
948 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949 (curr_ace->attr == curr_ace_outer->attr));
950 } else {
951 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
952 (curr_ace->type == curr_ace_outer->type) &&
953 (curr_ace->attr == curr_ace_outer->attr));
954 }
955
956 if (can_merge) {
957 if( DEBUGLVL( 10 )) {
958 dbgtext("merge_aces: Merging ACE's\n");
959 print_canon_ace( curr_ace_outer, 0);
960 print_canon_ace( curr_ace, 0);
961 }
962
963 /* Merge two allow or two deny ACE's. */
964
965 /* Theoretically we shouldn't merge a dir ACE if
966 * one ACE has the CI flag set, and the other
967 * ACE has the OI flag set, but this is rare
968 * enough we can ignore it. */
969
970 curr_ace_outer->perms |= curr_ace->perms;
971 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
972 DLIST_REMOVE(l_head, curr_ace);
973 SAFE_FREE(curr_ace);
974 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
975 }
976 }
977 }
978
979 /*
980 * Now go through and mask off allow permissions with deny permissions.
981 * We can delete either the allow or deny here as we know that each SID
982 * appears only once in the list.
983 */
984
985 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
986 canon_ace *curr_ace;
987 canon_ace *curr_ace_next;
988
989 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
990
991 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
992
993 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
994
995 /*
996 * Subtract ACE's with different entries. Due to the ordering constraints
997 * we've put on the ACL, we know the deny must be the first one.
998 */
999
1000 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003 if( DEBUGLVL( 10 )) {
1004 dbgtext("merge_aces: Masking ACE's\n");
1005 print_canon_ace( curr_ace_outer, 0);
1006 print_canon_ace( curr_ace, 0);
1007 }
1008
1009 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011 if (curr_ace->perms == 0) {
1012
1013 /*
1014 * The deny overrides the allow. Remove the allow.
1015 */
1016
1017 DLIST_REMOVE(l_head, curr_ace);
1018 SAFE_FREE(curr_ace);
1019 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021 } else {
1022
1023 /*
1024 * Even after removing permissions, there
1025 * are still allow permissions - delete the deny.
1026 * It is safe to delete the deny here,
1027 * as we are guarenteed by the deny first
1028 * ordering that all the deny entries for
1029 * this SID have already been merged into one
1030 * before we can get to an allow ace.
1031 */
1032
1033 DLIST_REMOVE(l_head, curr_ace_outer);
1034 SAFE_FREE(curr_ace_outer);
1035 break;
1036 }
1037 }
1038
1039 } /* end for curr_ace */
1040 } /* end for curr_ace_outer */
1041
1042 /* We may have modified the list. */
1043
1044 *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048 Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053 int compat = lp_acl_compatibility();
1054
1055 if (compat == ACL_COMPAT_AUTO) {
1056 enum remote_arch_types ra_type = get_remote_arch();
1057
1058 /* Automatically adapt to client */
1059 return (ra_type <= RA_WINNT);
1060 } else
1061 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066 Map canon_ace perms to permission bits NT.
1067 The attr element is not used here - we only process deny entries on set,
1068 not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072 enum security_ace_type *pacl_type,
1073 mode_t perms,
1074 bool directory_ace)
1075 {
1076 uint32_t nt_mask = 0;
1077
1078 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081 if (directory_ace) {
1082 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083 } else {
1084 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085 }
1086 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087 /*
1088 * Windows NT refuses to display ACEs with no permissions in them (but
1089 * they are perfectly legal with Windows 2000). If the ACE has empty
1090 * permissions we cannot use 0, so we use the otherwise unused
1091 * WRITE_OWNER permission, which we ignore when we set an ACL.
1092 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093 * to be changed in the future.
1094 */
1095
1096 if (nt4_compatible_acls())
1097 nt_mask = UNIX_ACCESS_NONE;
1098 else
1099 nt_mask = 0;
1100 } else {
1101 if (directory_ace) {
1102 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105 } else {
1106 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109 }
1110 }
1111
1112 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114 }
1115
1116 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117 (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119 return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123 Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132 mode_t mode = 0;
1133
1134 switch(type) {
1135 case S_IRUSR:
1136 if((*mask) & GENERIC_ALL_ACCESS)
1137 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138 else {
1139 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142 }
1143 break;
1144 case S_IRGRP:
1145 if((*mask) & GENERIC_ALL_ACCESS)
1146 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147 else {
1148 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151 }
1152 break;
1153 case S_IROTH:
1154 if((*mask) & GENERIC_ALL_ACCESS)
1155 mode = S_IROTH|S_IWOTH|S_IXOTH;
1156 else {
1157 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160 }
1161 break;
1162 }
1163
1164 return mode;
1165 }
1166
1167 /****************************************************************************
1168 Unpack a SEC_DESC into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172 {
1173 DOM_SID owner_sid;
1174 DOM_SID grp_sid;
1175
1176 *puser = (uid_t)-1;
1177 *pgrp = (gid_t)-1;
1178
1179 if(security_info_sent == 0) {
1180 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181 return NT_STATUS_OK;
1182 }
1183
1184 /*
1185 * Validate the owner and group SID's.
1186 */
1187
1188 memset(&owner_sid, '\0', sizeof(owner_sid));
1189 memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193 /*
1194 * Don't immediately fail if the owner sid cannot be validated.
1195 * This may be a group chown only set.
1196 */
1197
1198 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199 sid_copy(&owner_sid, psd->owner_sid);
1200 if (!sid_to_uid(&owner_sid, puser)) {
1201 if (lp_force_unknown_acl_user(snum)) {
1202 /* this allows take ownership to work
1203 * reasonably */
1204 *puser = current_user.ut.uid;
1205 } else {
1206 DEBUG(3,("unpack_nt_owners: unable to validate"
1207 " owner sid for %s\n",
1208 sid_string_dbg(&owner_sid)));
1209 return NT_STATUS_INVALID_OWNER;
1210 }
1211 }
1212 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213 (unsigned int)*puser ));
1214 }
1215
1216 /*
1217 * Don't immediately fail if the group sid cannot be validated.
1218 * This may be an owner chown only set.
1219 */
1220
1221 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222 sid_copy(&grp_sid, psd->group_sid);
1223 if (!sid_to_gid( &grp_sid, pgrp)) {
1224 if (lp_force_unknown_acl_user(snum)) {
1225 /* this allows take group ownership to work
1226 * reasonably */
1227 *pgrp = current_user.ut.gid;
1228 } else {
1229 DEBUG(3,("unpack_nt_owners: unable to validate"
1230 " group sid.\n"));
1231 return NT_STATUS_INVALID_OWNER;
1232 }
1233 }
1234 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235 (unsigned int)*pgrp));
1236 }
1237
1238 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240 return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244 Ensure the enforced permissions for this share apply.
1245 ****************************************************************************/
1246
1247 static void apply_default_perms(const struct share_params *params,
1248 const bool is_directory, canon_ace *pace,
1249 mode_t type)
1250 {
1251 mode_t and_bits = (mode_t)0;
1252 mode_t or_bits = (mode_t)0;
1253
1254 /* Get the initial bits to apply. */
1255
1256 if (is_directory) {
1257 and_bits = lp_dir_security_mask(params->service);
1258 or_bits = lp_force_dir_security_mode(params->service);
1259 } else {
1260 and_bits = lp_security_mask(params->service);
1261 or_bits = lp_force_security_mode(params->service);
1262 }
1263
1264 /* Now bounce them into the S_USR space. */
1265 switch(type) {
1266 case S_IRUSR:
1267 /* Ensure owner has read access. */
1268 pace->perms |= S_IRUSR;
1269 if (is_directory)
1270 pace->perms |= (S_IWUSR|S_IXUSR);
1271 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273 break;
1274 case S_IRGRP:
1275 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277 break;
1278 case S_IROTH:
1279 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281 break;
1282 }
1283
1284 pace->perms = ((pace->perms & and_bits)|or_bits);
1285 }
1286
1287 /****************************************************************************
1288 Check if a given uid/SID is in a group gid/SID. This is probably very
1289 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1290 ****************************************************************************/
1291
1292 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1293 {
1294 const char *u_name = NULL;
1295
1296 /* "Everyone" always matches every uid. */
1297
1298 if (sid_equal(&group_ace->trustee, &global_sid_World))
1299 return True;
1300
1301 /*
1302 * if it's the current user, we already have the unix token
1303 * and don't need to do the complex user_in_group_sid() call
1304 */
1305 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306 size_t i;
1307
1308 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309 return True;
1310 }
1311
1312 for (i=0; i < current_user.ut.ngroups; i++) {
1313 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314 return True;
1315 }
1316 }
1317 }
1318
1319 /* u_name talloc'ed off tos. */
1320 u_name = uidtoname(uid_ace->unix_ug.uid);
1321 if (!u_name) {
1322 return False;
1323 }
1324
1325 /*
1326 * user_in_group_sid() uses create_token_from_username()
1327 * which creates an artificial NT token given just a username,
1328 * so this is not reliable for users from foreign domains
1329 * exported by winbindd!
1330 */
1331 return user_in_group_sid(u_name, &group_ace->trustee);
1332 }
1333
1334 /****************************************************************************
1335 A well formed POSIX file or default ACL has at least 3 entries, a
1336 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337 In addition, the owner must always have at least read access.
1338 When using this call on get_acl, the pst struct is valid and contains
1339 the mode of the file. When using this call on set_acl, the pst struct has
1340 been modified to have a mode containing the default for this file or directory
1341 type.
1342 ****************************************************************************/
1343
1344 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345 const struct share_params *params,
1346 const bool is_directory,
1347 const DOM_SID *pfile_owner_sid,
1348 const DOM_SID *pfile_grp_sid,
1349 const SMB_STRUCT_STAT *pst,
1350 bool setting_acl)
1351 {
1352 canon_ace *pace;
1353 bool got_user = False;
1354 bool got_grp = False;
1355 bool got_other = False;
1356 canon_ace *pace_other = NULL;
1357
1358 for (pace = *pp_ace; pace; pace = pace->next) {
1359 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361 if (setting_acl)
1362 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363 got_user = True;
1364
1365 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367 /*
1368 * Ensure create mask/force create mode is respected on set.
1369 */
1370
1371 if (setting_acl)
1372 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373 got_grp = True;
1374
1375 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377 /*
1378 * Ensure create mask/force create mode is respected on set.
1379 */
1380
1381 if (setting_acl)
1382 apply_default_perms(params, is_directory, pace, S_IROTH);
1383 got_other = True;
1384 pace_other = pace;
1385 }
1386 }
1387
1388 if (!got_user) {
1389 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391 return False;
1392 }
1393
1394 ZERO_STRUCTP(pace);
1395 pace->type = SMB_ACL_USER_OBJ;
1396 pace->owner_type = UID_ACE;
1397 pace->unix_ug.uid = pst->st_ex_uid;
1398 pace->trustee = *pfile_owner_sid;
1399 pace->attr = ALLOW_ACE;
1400
1401 if (setting_acl) {
1402 /* See if the owning user is in any of the other groups in
1403 the ACE. If so, OR in the permissions from that group. */
1404
1405 bool group_matched = False;
1406 canon_ace *pace_iter;
1407
1408 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1410 if (uid_entry_in_group(pace, pace_iter)) {
1411 pace->perms |= pace_iter->perms;
1412 group_matched = True;
1413 }
1414 }
1415 }
1416
1417 /* If we only got an "everyone" perm, just use that. */
1418 if (!group_matched) {
1419 if (got_other)
1420 pace->perms = pace_other->perms;
1421 else
1422 pace->perms = 0;
1423 }
1424
1425 apply_default_perms(params, is_directory, pace, S_IRUSR);
1426 } else {
1427 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428 }
1429
1430 DLIST_ADD(*pp_ace, pace);
1431 }
1432
1433 if (!got_grp) {
1434 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436 return False;
1437 }
1438
1439 ZERO_STRUCTP(pace);
1440 pace->type = SMB_ACL_GROUP_OBJ;
1441 pace->owner_type = GID_ACE;
1442 pace->unix_ug.uid = pst->st_ex_gid;
1443 pace->trustee = *pfile_grp_sid;
1444 pace->attr = ALLOW_ACE;
1445 if (setting_acl) {
1446 /* If we only got an "everyone" perm, just use that. */
1447 if (got_other)
1448 pace->perms = pace_other->perms;
1449 else
1450 pace->perms = 0;
1451 apply_default_perms(params, is_directory, pace, S_IRGRP);
1452 } else {
1453 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454 }
1455
1456 DLIST_ADD(*pp_ace, pace);
1457 }
1458
1459 if (!got_other) {
1460 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462 return False;
1463 }
1464
1465 ZERO_STRUCTP(pace);
1466 pace->type = SMB_ACL_OTHER;
1467 pace->owner_type = WORLD_ACE;
1468 pace->unix_ug.world = -1;
1469 pace->trustee = global_sid_World;
1470 pace->attr = ALLOW_ACE;
1471 if (setting_acl) {
1472 pace->perms = 0;
1473 apply_default_perms(params, is_directory, pace, S_IROTH);
1474 } else
1475 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477 DLIST_ADD(*pp_ace, pace);
1478 }
1479
1480 return True;
1481 }
1482
1483 /****************************************************************************
1484 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485 If it does not have them, check if there are any entries where the trustee is the
1486 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487 ****************************************************************************/
1488
1489 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490 {
1491 bool got_user_obj, got_group_obj;
1492 canon_ace *current_ace;
1493 int i, entries;
1494
1495 entries = count_canon_ace_list(ace);
1496 got_user_obj = False;
1497 got_group_obj = False;
1498
1499 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500 if (current_ace->type == SMB_ACL_USER_OBJ)
1501 got_user_obj = True;
1502 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503 got_group_obj = True;
1504 }
1505 if (got_user_obj && got_group_obj) {
1506 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507 return;
1508 }
1509
1510 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513 current_ace->type = SMB_ACL_USER_OBJ;
1514 got_user_obj = True;
1515 }
1516 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518 current_ace->type = SMB_ACL_GROUP_OBJ;
1519 got_group_obj = True;
1520 }
1521 }
1522 if (!got_user_obj)
1523 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524 if (!got_group_obj)
1525 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526 }
1527
1528 /****************************************************************************
1529 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1530 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1531 ****************************************************************************/
1532
1533 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1534 {
1535 /* dir ace must be followings.
1536 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1537 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1538 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1539 Posix ACL u:trustee:perm
1540
1541 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1542 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1543 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1544 Posix ACL g:trustee:perm
1545 */
1546
1547 if (ace->type == SMB_ACL_USER_OBJ &&
1548 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1549 canon_ace *dup_ace = dup_canon_ace(ace);
1550
1551 if (dup_ace == NULL) {
1552 return false;
1553 }
1554 dup_ace->type = SMB_ACL_USER;
1555 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1556 }
1557
1558 if (ace->type == SMB_ACL_GROUP_OBJ &&
1559 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1560 canon_ace *dup_ace = dup_canon_ace(ace);
1561
1562 if (dup_ace == NULL) {
1563 return false;
1564 }
1565 dup_ace->type = SMB_ACL_GROUP;
1566 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1567 }
1568
1569 return true;
1570 }
1571
1572 /****************************************************************************
1573 Unpack a SEC_DESC into two canonical ace lists.
1574 ****************************************************************************/
1575
1576 static bool create_canon_ace_lists(files_struct *fsp,
1577 const SMB_STRUCT_STAT *pst,
1578 DOM_SID *pfile_owner_sid,
1579 DOM_SID *pfile_grp_sid,
1580 canon_ace **ppfile_ace,
1581 canon_ace **ppdir_ace,
1582 const SEC_ACL *dacl)
1583 {
1584 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1585 canon_ace *file_ace = NULL;
1586 canon_ace *dir_ace = NULL;
1587 canon_ace *current_ace = NULL;
1588 bool got_dir_allow = False;
1589 bool got_file_allow = False;
1590 int i, j;
1591
1592 *ppfile_ace = NULL;
1593 *ppdir_ace = NULL;
1594
1595 /*
1596 * Convert the incoming ACL into a more regular form.
1597 */
1598
1599 for(i = 0; i < dacl->num_aces; i++) {
1600 SEC_ACE *psa = &dacl->aces[i];
1601
1602 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1603 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1604 return False;
1605 }
1606
1607 if (nt4_compatible_acls()) {
1608 /*
1609 * The security mask may be UNIX_ACCESS_NONE which should map into
1610 * no permissions (we overload the WRITE_OWNER bit for this) or it
1611 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1612 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1613 */
1614
1615 /*
1616 * Convert GENERIC bits to specific bits.
1617 */
1618
1619 se_map_generic(&psa->access_mask, &file_generic_mapping);
1620
1621 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1622
1623 if(psa->access_mask != UNIX_ACCESS_NONE)
1624 psa->access_mask &= ~UNIX_ACCESS_NONE;
1625 }
1626 }
1627
1628 /*
1629 * Deal with the fact that NT 4.x re-writes the canonical format
1630 * that we return for default ACLs. If a directory ACE is identical
1631 * to a inherited directory ACE then NT changes the bits so that the
1632 * first ACE is set to OI|IO and the second ACE for this SID is set
1633 * to CI. We need to repair this. JRA.
1634 */
1635
1636 for(i = 0; i < dacl->num_aces; i++) {
1637 SEC_ACE *psa1 = &dacl->aces[i];
1638
1639 for (j = i + 1; j < dacl->num_aces; j++) {
1640 SEC_ACE *psa2 = &dacl->aces[j];
1641
1642 if (psa1->access_mask != psa2->access_mask)
1643 continue;
1644
1645 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1646 continue;
1647
1648 /*
1649 * Ok - permission bits and SIDs are equal.
1650 * Check if flags were re-written.
1651 */
1652
1653 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1654
1655 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1656 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1657
1658 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1661 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663 }
1664 }
1665 }
1666
1667 for(i = 0; i < dacl->num_aces; i++) {
1668 SEC_ACE *psa = &dacl->aces[i];
1669
1670 /*
1671 * Create a cannon_ace entry representing this NT DACL ACE.
1672 */
1673
1674 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1675 free_canon_ace_list(file_ace);
1676 free_canon_ace_list(dir_ace);
1677 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1678 return False;
1679 }
1680
1681 ZERO_STRUCTP(current_ace);
1682
1683 sid_copy(&current_ace->trustee, &psa->trustee);
1684
1685 /*
1686 * Try and work out if the SID is a user or group
1687 * as we need to flag these differently for POSIX.
1688 * Note what kind of a POSIX ACL this should map to.
1689 */
1690
1691 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1692 current_ace->owner_type = WORLD_ACE;
1693 current_ace->unix_ug.world = -1;
1694 current_ace->type = SMB_ACL_OTHER;
1695 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1696 current_ace->owner_type = UID_ACE;
1697 current_ace->unix_ug.uid = pst->st_ex_uid;
1698 current_ace->type = SMB_ACL_USER_OBJ;
1699
1700 /*
1701 * The Creator Owner entry only specifies inheritable permissions,
1702 * never access permissions. WinNT doesn't always set the ACE to
1703 * INHERIT_ONLY, though.
1704 */
1705
1706 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1707
1708 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1709 current_ace->owner_type = GID_ACE;
1710 current_ace->unix_ug.gid = pst->st_ex_gid;
1711 current_ace->type = SMB_ACL_GROUP_OBJ;
1712
1713 /*
1714 * The Creator Group entry only specifies inheritable permissions,
1715 * never access permissions. WinNT doesn't always set the ACE to
1716 * INHERIT_ONLY, though.
1717 */
1718 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1721 current_ace->owner_type = UID_ACE;
1722 /* If it's the owning user, this is a user_obj, not
1723 * a user. */
1724 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1725 current_ace->type = SMB_ACL_USER_OBJ;
1726 } else {
1727 current_ace->type = SMB_ACL_USER;
1728 }
1729 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1730 current_ace->owner_type = GID_ACE;
1731 /* If it's the primary group, this is a group_obj, not
1732 * a group. */
1733 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1734 current_ace->type = SMB_ACL_GROUP_OBJ;
1735 } else {
1736 current_ace->type = SMB_ACL_GROUP;
1737 }
1738 } else {
1739 /*
1740 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1741 */
1742
1743 if (non_mappable_sid(&psa->trustee)) {
1744 DEBUG(10, ("create_canon_ace_lists: ignoring "
1745 "non-mappable SID %s\n",
1746 sid_string_dbg(&psa->trustee)));
1747 SAFE_FREE(current_ace);
1748 continue;
1749 }
1750
1751 free_canon_ace_list(file_ace);
1752 free_canon_ace_list(dir_ace);
1753 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1754 "%s to uid or gid.\n",
1755 sid_string_dbg(&current_ace->trustee)));
1756 SAFE_FREE(current_ace);
1757 return False;
1758 }
1759
1760 /*
1761 * Map the given NT permissions into a UNIX mode_t containing only
1762 * S_I(R|W|X)USR bits.
1763 */
1764
1765 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1766 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1767
1768 /* Store the ace_flag. */
1769 current_ace->ace_flags = psa->flags;
1770
1771 /*
1772 * Now add the created ace to either the file list, the directory
1773 * list, or both. We *MUST* preserve the order here (hence we use
1774 * DLIST_ADD_END) as NT ACLs are order dependent.
1775 */
1776
1777 if (fsp->is_directory) {
1778
1779 /*
1780 * We can only add to the default POSIX ACE list if the ACE is
1781 * designed to be inherited by both files and directories.
1782 */
1783
1784 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1785 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1786
1787 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1788
1789 /*
1790 * Note if this was an allow ace. We can't process
1791 * any further deny ace's after this.
1792 */
1793
1794 if (current_ace->attr == ALLOW_ACE)
1795 got_dir_allow = True;
1796
1797 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1798 DEBUG(0,("create_canon_ace_lists: "
1799 "malformed ACL in "
1800 "inheritable ACL! Deny entry "
1801 "after Allow entry. Failing "
1802 "to set on file %s.\n",
1803 fsp_str_dbg(fsp)));
1804 free_canon_ace_list(file_ace);
1805 free_canon_ace_list(dir_ace);
1806 return False;
1807 }
1808
1809 if( DEBUGLVL( 10 )) {
1810 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1811 print_canon_ace( current_ace, 0);
1812 }
1813
1814 /*
1815 * We have a lossy mapping: directory ACE entries
1816 * CREATOR_OWNER ------\
1817 * (map to) +---> SMB_ACL_USER_OBJ
1818 * owning sid ------/
1819 *
1820 * CREATOR_GROUP ------\
1821 * (map to) +---> SMB_ACL_GROUP_OBJ
1822 * primary group sid --/
1823 *
1824 * on set. And on read of a directory ACL
1825 *
1826 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1827 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1828 *
1829 * Deal with this on set by duplicating
1830 * owning sid and primary group sid ACE
1831 * entries into the directory ACL.
1832 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1833 */
1834
1835 if (!dup_owning_ace(dir_ace, current_ace)) {
1836 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1837 free_canon_ace_list(file_ace);
1838 free_canon_ace_list(dir_ace);
1839 return false;
1840 }
1841
1842 /*
1843 * If this is not an inherit only ACE we need to add a duplicate
1844 * to the file acl.
1845 */
1846
1847 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1848 canon_ace *dup_ace = dup_canon_ace(current_ace);
1849
1850 if (!dup_ace) {
1851 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1852 free_canon_ace_list(file_ace);
1853 free_canon_ace_list(dir_ace);
1854 return False;
1855 }
1856
1857 /*
1858 * We must not free current_ace here as its
1859 * pointer is now owned by the dir_ace list.
1860 */
1861 current_ace = dup_ace;
1862 /* We've essentially split this ace into two,
1863 * and added the ace with inheritance request
1864 * bits to the directory ACL. Drop those bits for
1865 * the ACE we're adding to the file list. */
1866 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1867 SEC_ACE_FLAG_CONTAINER_INHERIT|
1868 SEC_ACE_FLAG_INHERIT_ONLY);
1869 } else {
1870 /*
1871 * We must not free current_ace here as its
1872 * pointer is now owned by the dir_ace list.
1873 */
1874 current_ace = NULL;
1875 }
1876 }
1877 }
1878
1879 /*
1880 * Only add to the file ACL if not inherit only.
1881 */
1882
1883 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1884 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1885
1886 /*
1887 * Note if this was an allow ace. We can't process
1888 * any further deny ace's after this.
1889 */
1890
1891 if (current_ace->attr == ALLOW_ACE)
1892 got_file_allow = True;
1893
1894 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1895 DEBUG(0,("create_canon_ace_lists: malformed "
1896 "ACL in file ACL ! Deny entry after "
1897 "Allow entry. Failing to set on file "
1898 "%s.\n", fsp_str_dbg(fsp)));
1899 free_canon_ace_list(file_ace);
1900 free_canon_ace_list(dir_ace);
1901 return False;
1902 }
1903
1904 if( DEBUGLVL( 10 )) {
1905 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1906 print_canon_ace( current_ace, 0);
1907 }
1908 all_aces_are_inherit_only = False;
1909 /*
1910 * We must not free current_ace here as its
1911 * pointer is now owned by the file_ace list.
1912 */
1913 current_ace = NULL;
1914 }
1915
1916 /*
1917 * Free if ACE was not added.
1918 */
1919
1920 SAFE_FREE(current_ace);
1921 }
1922
1923 if (fsp->is_directory && all_aces_are_inherit_only) {
1924 /*
1925 * Windows 2000 is doing one of these weird 'inherit acl'
1926 * traverses to conserve NTFS ACL resources. Just pretend
1927 * there was no DACL sent. JRA.
1928 */
1929
1930 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1931 free_canon_ace_list(file_ace);
1932 free_canon_ace_list(dir_ace);
1933 file_ace = NULL;
1934 dir_ace = NULL;
1935 } else {
1936 /*
1937 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1938 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1939 * entries can be converted to *_OBJ. Usually we will already have these
1940 * entries in the Default ACL, and the Access ACL will not have them.
1941 */
1942 if (file_ace) {
1943 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1944 }
1945 if (dir_ace) {
1946 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1947 }
1948 }
1949
1950 *ppfile_ace = file_ace;
1951 *ppdir_ace = dir_ace;
1952
1953 return True;
1954 }
1955
1956 /****************************************************************************
1957 ASCII art time again... JRA :-).
1958
1959 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1960 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1961 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1962 allow or deny have been merged, so the same SID can only appear once in the deny
1963 list or once in the allow list.
1964
1965 We then process as follows :
1966
1967 ---------------------------------------------------------------------------
1968 First pass - look for a Everyone DENY entry.
1969
1970 If it is deny all (rwx) trunate the list at this point.
1971 Else, walk the list from this point and use the deny permissions of this
1972 entry as a mask on all following allow entries. Finally, delete
1973 the Everyone DENY entry (we have applied it to everything possible).
1974
1975 In addition, in this pass we remove any DENY entries that have
1976 no permissions (ie. they are a DENY nothing).
1977 ---------------------------------------------------------------------------
1978 Second pass - only deal with deny user entries.
1979
1980 DENY user1 (perms XXX)
1981
1982 new_perms = 0
1983 for all following allow group entries where user1 is in group
1984 new_perms |= group_perms;
1985
1986 user1 entry perms = new_perms & ~ XXX;
1987
1988 Convert the deny entry to an allow entry with the new perms and
1989 push to the end of the list. Note if the user was in no groups
1990 this maps to a specific allow nothing entry for this user.
1991
1992 The common case from the NT ACL choser (userX deny all) is
1993 optimised so we don't do the group lookup - we just map to
1994 an allow nothing entry.
1995
1996 What we're doing here is inferring the allow permissions the
1997 person setting the ACE on user1 wanted by looking at the allow
1998 permissions on the groups the user is currently in. This will
1999 be a snapshot, depending on group membership but is the best
2000 we can do and has the advantage of failing closed rather than
2001 open.
2002 ---------------------------------------------------------------------------
2003 Third pass - only deal with deny group entries.
2004
2005 DENY group1 (perms XXX)
2006
2007 for all following allow user entries where user is in group1
2008 user entry perms = user entry perms & ~ XXX;
2009
2010 If there is a group Everyone allow entry with permissions YYY,
2011 convert the group1 entry to an allow entry and modify its
2012 permissions to be :
2013
2014 new_perms = YYY & ~ XXX
2015
2016 and push to the end of the list.
2017
2018 If there is no group Everyone allow entry then convert the
2019 group1 entry to a allow nothing entry and push to the end of the list.
2020
2021 Note that the common case from the NT ACL choser (groupX deny all)
2022 cannot be optimised here as we need to modify user entries who are
2023 in the group to change them to a deny all also.
2024
2025 What we're doing here is modifying the allow permissions of
2026 user entries (which are more specific in POSIX ACLs) to mask
2027 out the explicit deny set on the group they are in. This will
2028 be a snapshot depending on current group membership but is the
2029 best we can do and has the advantage of failing closed rather
2030 than open.
2031 ---------------------------------------------------------------------------
2032 Fourth pass - cope with cumulative permissions.
2033
2034 for all allow user entries, if there exists an allow group entry with
2035 more permissive permissions, and the user is in that group, rewrite the
2036 allow user permissions to contain both sets of permissions.
2037
2038 Currently the code for this is #ifdef'ed out as these semantics make
2039 no sense to me. JRA.
2040 ---------------------------------------------------------------------------
2041
2042 Note we *MUST* do the deny user pass first as this will convert deny user
2043 entries into allow user entries which can then be processed by the deny
2044 group pass.
2045
2046 The above algorithm took a *lot* of thinking about - hence this
2047 explaination :-). JRA.
2048 ****************************************************************************/
2049
2050 /****************************************************************************
2051 Process a canon_ace list entries. This is very complex code. We need
2052 to go through and remove the "deny" permissions from any allow entry that matches
2053 the id of this entry. We have already refused any NT ACL that wasn't in correct
2054 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2055 we just remove it (to fail safe). We have already removed any duplicate ace
2056 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2057 allow entries.
2058 ****************************************************************************/
2059
2060 static void process_deny_list( canon_ace **pp_ace_list )
2061 {
2062 canon_ace *ace_list = *pp_ace_list;
2063 canon_ace *curr_ace = NULL;
2064 canon_ace *curr_ace_next = NULL;
2065
2066 /* Pass 1 above - look for an Everyone, deny entry. */
2067
2068 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2069 canon_ace *allow_ace_p;
2070
2071 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2072
2073 if (curr_ace->attr != DENY_ACE)
2074 continue;
2075
2076 if (curr_ace->perms == (mode_t)0) {
2077
2078 /* Deny nothing entry - delete. */
2079
2080 DLIST_REMOVE(ace_list, curr_ace);
2081 continue;
2082 }
2083
2084 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2085 continue;
2086
2087 /* JRATEST - assert. */
2088 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2089
2090 if (curr_ace->perms == ALL_ACE_PERMS) {
2091
2092 /*
2093 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2094 * list at this point including this entry.
2095 */
2096
2097 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2098
2099 free_canon_ace_list( curr_ace );
2100 if (prev_entry)
2101 DLIST_REMOVE(ace_list, prev_entry);
2102 else {
2103 /* We deleted the entire list. */
2104 ace_list = NULL;
2105 }
2106 break;
2107 }
2108
2109 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2110
2111 /*
2112 * Only mask off allow entries.
2113 */
2114
2115 if (allow_ace_p->attr != ALLOW_ACE)
2116 continue;
2117
2118 allow_ace_p->perms &= ~curr_ace->perms;
2119 }
2120
2121 /*
2122 * Now it's been applied, remove it.
2123 */
2124
2125 DLIST_REMOVE(ace_list, curr_ace);
2126 }
2127
2128 /* Pass 2 above - deal with deny user entries. */
2129
2130 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2131 mode_t new_perms = (mode_t)0;
2132 canon_ace *allow_ace_p;
2133
2134 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2135
2136 if (curr_ace->attr != DENY_ACE)
2137 continue;
2138
2139 if (curr_ace->owner_type != UID_ACE)
2140 continue;
2141
2142 if (curr_ace->perms == ALL_ACE_PERMS) {
2143
2144 /*
2145 * Optimisation - this is a deny everything to this user.
2146 * Convert to an allow nothing and push to the end of the list.
2147 */
2148
2149 curr_ace->attr = ALLOW_ACE;
2150 curr_ace->perms = (mode_t)0;
2151 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2152 continue;
2153 }
2154
2155 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2156
2157 if (allow_ace_p->attr != ALLOW_ACE)
2158 continue;
2159
2160 /* We process GID_ACE and WORLD_ACE entries only. */
2161
2162 if (allow_ace_p->owner_type == UID_ACE)
2163 continue;
2164
2165 if (uid_entry_in_group( curr_ace, allow_ace_p))
2166 new_perms |= allow_ace_p->perms;
2167 }
2168
2169 /*
2170 * Convert to a allow entry, modify the perms and push to the end
2171 * of the list.
2172 */
2173
2174 curr_ace->attr = ALLOW_ACE;
2175 curr_ace->perms = (new_perms & ~curr_ace->perms);
2176 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2177 }
2178
2179 /* Pass 3 above - deal with deny group entries. */
2180
2181 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182 canon_ace *allow_ace_p;
2183 canon_ace *allow_everyone_p = NULL;
2184
2185 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187 if (curr_ace->attr != DENY_ACE)
2188 continue;
2189
2190 if (curr_ace->owner_type != GID_ACE)
2191 continue;
2192
2193 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2194
2195 if (allow_ace_p->attr != ALLOW_ACE)
2196 continue;
2197
2198 /* Store a pointer to the Everyone allow, if it exists. */
2199 if (allow_ace_p->owner_type == WORLD_ACE)
2200 allow_everyone_p = allow_ace_p;
2201
2202 /* We process UID_ACE entries only. */
2203
2204 if (allow_ace_p->owner_type != UID_ACE)
2205 continue;
2206
2207 /* Mask off the deny group perms. */
2208
2209 if (uid_entry_in_group( allow_ace_p, curr_ace))
2210 allow_ace_p->perms &= ~curr_ace->perms;
2211 }
2212
2213 /*
2214 * Convert the deny to an allow with the correct perms and
2215 * push to the end of the list.
2216 */
2217
2218 curr_ace->attr = ALLOW_ACE;
2219 if (allow_everyone_p)
2220 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2221 else
2222 curr_ace->perms = (mode_t)0;
2223 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2224 }
2225
2226 /* Doing this fourth pass allows Windows semantics to be layered
2227 * on top of POSIX semantics. I'm not sure if this is desirable.
2228 * For example, in W2K ACLs there is no way to say, "Group X no
2229 * access, user Y full access" if user Y is a member of group X.
2230 * This seems completely broken semantics to me.... JRA.
2231 */
2232
2233 #if 0
2234 /* Pass 4 above - deal with allow entries. */
2235
2236 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2237 canon_ace *allow_ace_p;
2238
2239 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2240
2241 if (curr_ace->attr != ALLOW_ACE)
2242 continue;
2243
2244 if (curr_ace->owner_type != UID_ACE)
2245 continue;
2246
2247 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2248
2249 if (allow_ace_p->attr != ALLOW_ACE)
2250 continue;
2251
2252 /* We process GID_ACE entries only. */
2253
2254 if (allow_ace_p->owner_type != GID_ACE)
2255 continue;
2256
2257 /* OR in the group perms. */
2258
2259 if (uid_entry_in_group( curr_ace, allow_ace_p))
2260 curr_ace->perms |= allow_ace_p->perms;
2261 }
2262 }
2263 #endif
2264
2265 *pp_ace_list = ace_list;
2266 }
2267
2268 /****************************************************************************
2269 Create a default mode that will be used if a security descriptor entry has
2270 no user/group/world entries.
2271 ****************************************************************************/
2272
2273 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2274 {
2275 int snum = SNUM(fsp->conn);
2276 mode_t and_bits = (mode_t)0;
2277 mode_t or_bits = (mode_t)0;
2278 mode_t mode;
2279
2280 if (interitable_mode) {
2281 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2282 fsp->fsp_name, NULL);
2283 } else {
2284 mode = S_IRUSR;
2285 }
2286
2287 if (fsp->is_directory)
2288 mode |= (S_IWUSR|S_IXUSR);
2289
2290 /*
2291 * Now AND with the create mode/directory mode bits then OR with the
2292 * force create mode/force directory mode bits.
2293 */
2294
2295 if (fsp->is_directory) {
2296 and_bits = lp_dir_security_mask(snum);
2297 or_bits = lp_force_dir_security_mode(snum);
2298 } else {
2299 and_bits = lp_security_mask(snum);
2300 or_bits = lp_force_security_mode(snum);
2301 }
2302
2303 return ((mode & and_bits)|or_bits);
2304 }
2305
2306 /****************************************************************************
2307 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2308 succeeding.
2309 ****************************************************************************/
2310
2311 static bool unpack_canon_ace(files_struct *fsp,
2312 const SMB_STRUCT_STAT *pst,
2313 DOM_SID *pfile_owner_sid,
2314 DOM_SID *pfile_grp_sid,
2315 canon_ace **ppfile_ace,
2316 canon_ace **ppdir_ace,
2317 uint32 security_info_sent,
2318 const SEC_DESC *psd)
2319 {
2320 SMB_STRUCT_STAT st;
2321 canon_ace *file_ace = NULL;
2322 canon_ace *dir_ace = NULL;
2323
2324 *ppfile_ace = NULL;
2325 *ppdir_ace = NULL;
2326
2327 if(security_info_sent == 0) {
2328 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2329 return False;
2330 }
2331
2332 /*
2333 * If no DACL then this is a chown only security descriptor.
2334 */
2335
2336 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2337 return True;
2338
2339 /*
2340 * Now go through the DACL and create the canon_ace lists.
2341 */
2342
2343 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2344 &file_ace, &dir_ace, psd->dacl))
2345 return False;
2346
2347 if ((file_ace == NULL) && (dir_ace == NULL)) {
2348 /* W2K traverse DACL set - ignore. */
2349 return True;
2350 }
2351
2352 /*
2353 * Go through the canon_ace list and merge entries
2354 * belonging to identical users of identical allow or deny type.
2355 * We can do this as all deny entries come first, followed by
2356 * all allow entries (we have mandated this before accepting this acl).
2357 */
2358
2359 print_canon_ace_list( "file ace - before merge", file_ace);
2360 merge_aces( &file_ace, false);
2361
2362 print_canon_ace_list( "dir ace - before merge", dir_ace);
2363 merge_aces( &dir_ace, true);
2364
2365 /*
2366 * NT ACLs are order dependent. Go through the acl lists and
2367 * process DENY entries by masking the allow entries.
2368 */
2369
2370 print_canon_ace_list( "file ace - before deny", file_ace);
2371 process_deny_list( &file_ace);
2372
2373 print_canon_ace_list( "dir ace - before deny", dir_ace);
2374 process_deny_list( &dir_ace);
2375
2376 /*
2377 * A well formed POSIX file or default ACL has at least 3 entries, a
2378 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2379 * and optionally a mask entry. Ensure this is the case.
2380 */
2381
2382 print_canon_ace_list( "file ace - before valid", file_ace);
2383
2384 st = *pst;
2385
2386 /*
2387 * A default 3 element mode entry for a file should be r-- --- ---.
2388 * A default 3 element mode entry for a directory should be rwx --- ---.
2389 */
2390
2391 st.st_ex_mode = create_default_mode(fsp, False);
2392
2393 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2394 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2395 free_canon_ace_list(file_ace);
2396 free_canon_ace_list(dir_ace);
2397 return False;
2398 }
2399
2400 print_canon_ace_list( "dir ace - before valid", dir_ace);
2401
2402 /*
2403 * A default inheritable 3 element mode entry for a directory should be the
2404 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2405 * it's a directory.
2406 */
2407
2408 st.st_ex_mode = create_default_mode(fsp, True);
2409
2410 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2411 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2412 free_canon_ace_list(file_ace);
2413 free_canon_ace_list(dir_ace);
2414 return False;
2415 }
2416
2417 print_canon_ace_list( "file ace - return", file_ace);
2418 print_canon_ace_list( "dir ace - return", dir_ace);
2419
2420 *ppfile_ace = file_ace;
2421 *ppdir_ace = dir_ace;
2422 return True;
2423
2424 }
2425
2426 /******************************************************************************
2427 When returning permissions, try and fit NT display
2428 semantics if possible. Note the the canon_entries here must have been malloced.
2429 The list format should be - first entry = owner, followed by group and other user
2430 entries, last entry = other.
2431
2432 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2433 are not ordered, and match on the most specific entry rather than walking a list,
2434 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2435
2436 Entry 0: owner : deny all except read and write.
2437 Entry 1: owner : allow read and write.
2438 Entry 2: group : deny all except read.
2439 Entry 3: group : allow read.
2440 Entry 4: Everyone : allow read.
2441
2442 But NT cannot display this in their ACL editor !
2443 ********************************************************************************/
2444
2445 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2446 {
2447 canon_ace *l_head = *pp_list_head;
2448 canon_ace *owner_ace = NULL;
2449 canon_ace *other_ace = NULL;
2450 canon_ace *ace = NULL;
2451
2452 for (ace = l_head; ace; ace = ace->next) {
2453 if (ace->type == SMB_ACL_USER_OBJ)
2454 owner_ace = ace;
2455 else if (ace->type == SMB_ACL_OTHER) {
2456 /* Last ace - this is "other" */
2457 other_ace = ace;
2458 }
2459 }
2460
2461 if (!owner_ace || !other_ace) {
2462 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2463 filename ));
2464 return;
2465 }
2466
2467 /*
2468 * The POSIX algorithm applies to owner first, and other last,
2469 * so ensure they are arranged in this order.
2470 */
2471
2472 if (owner_ace) {
2473 DLIST_PROMOTE(l_head, owner_ace);
2474 }
2475
2476 if (other_ace) {
2477 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2478 }
2479
2480 /* We have probably changed the head of the list. */
2481
2482 *pp_list_head = l_head;
2483 }
2484
2485 /****************************************************************************
2486 Create a linked list of canonical ACE entries.
2487 ****************************************************************************/
2488
2489 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2490 const char *fname, SMB_ACL_T posix_acl,
2491 const SMB_STRUCT_STAT *psbuf,
2492 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2493 {
2494 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2495 canon_ace *l_head = NULL;
2496 canon_ace *ace = NULL;
2497 canon_ace *next_ace = NULL;
2498 int entry_id = SMB_ACL_FIRST_ENTRY;
2499 SMB_ACL_ENTRY_T entry;
2500 size_t ace_count;
2501
2502 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2503 SMB_ACL_TAG_T tagtype;
2504 SMB_ACL_PERMSET_T permset;
2505 DOM_SID sid;
2506 posix_id unix_ug;
2507 enum ace_owner owner_type;
2508
2509 entry_id = SMB_ACL_NEXT_ENTRY;
2510
2511 /* Is this a MASK entry ? */
2512 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2513 continue;
2514
2515 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2516 continue;
2517
2518 /* Decide which SID to use based on the ACL type. */
2519 switch(tagtype) {
2520 case SMB_ACL_USER_OBJ:
2521 /* Get the SID from the owner. */
2522 sid_copy(&sid, powner);
2523 unix_ug.uid = psbuf->st_ex_uid;
2524 owner_type = UID_ACE;
2525 break;
2526 case SMB_ACL_USER:
2527 {
2528 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2529 if (puid == NULL) {
2530 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2531 continue;
2532 }
2533 uid_to_sid( &sid, *puid);
2534 unix_ug.uid = *puid;
2535 owner_type = UID_ACE;
2536 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2537 break;
2538 }
2539 case SMB_ACL_GROUP_OBJ:
2540 /* Get the SID from the owning group. */
2541 sid_copy(&sid, pgroup);
2542 unix_ug.gid = psbuf->st_ex_gid;
2543 owner_type = GID_ACE;
2544 break;
2545 case SMB_ACL_GROUP:
2546 {
2547 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2548 if (pgid == NULL) {
2549 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2550 continue;
2551 }
2552 gid_to_sid( &sid, *pgid);
2553 unix_ug.gid = *pgid;
2554 owner_type = GID_ACE;
2555 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2556 break;
2557 }
2558 case SMB_ACL_MASK:
2559 acl_mask = convert_permset_to_mode_t(conn, permset);
2560 continue; /* Don't count the mask as an entry. */
2561 case SMB_ACL_OTHER:
2562 /* Use the Everyone SID */
2563 sid = global_sid_World;
2564 unix_ug.world = -1;
2565 owner_type = WORLD_ACE;
2566 break;
2567 default:
2568 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2569 continue;
2570 }
2571
2572 /*
2573 * Add this entry to the list.
2574 */
2575
2576 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2577 goto fail;
2578
2579 ZERO_STRUCTP(ace);
2580 ace->type = tagtype;
2581 ace->perms = convert_permset_to_mode_t(conn, permset);
2582 ace->attr = ALLOW_ACE;
2583 ace->trustee = sid;
2584 ace->unix_ug = unix_ug;
2585 ace->owner_type = owner_type;
2586 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2587
2588 DLIST_ADD(l_head, ace);
2589 }
2590
2591 /*
2592 * This next call will ensure we have at least a user/group/world set.
2593 */
2594
2595 if (!ensure_canon_entry_valid(&l_head, conn->params,
2596 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2597 psbuf, False))
2598 goto fail;
2599
2600 /*
2601 * Now go through the list, masking the permissions with the
2602 * acl_mask. Ensure all DENY Entries are at the start of the list.
2603 */
2604
2605 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2606
2607 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2608 next_ace = ace->next;
2609
2610 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2611 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2612 ace->perms &= acl_mask;
2613
2614 if (ace->perms == 0) {
2615 DLIST_PROMOTE(l_head, ace);
2616 }
2617
2618 if( DEBUGLVL( 10 ) ) {
2619 print_canon_ace(ace, ace_count);
2620 }
2621 }
2622
2623 arrange_posix_perms(fname,&l_head );
2624
2625 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2626
2627 return l_head;
2628
2629 fail:
2630
2631 free_canon_ace_list(l_head);
2632 return NULL;
2633 }
2634
2635 /****************************************************************************
2636 Check if the current user group list contains a given group.
2637 ****************************************************************************/
2638
2639 static bool current_user_in_group(gid_t gid)
2640 {
2641 int i;
2642
2643 for (i = 0; i < current_user.ut.ngroups; i++) {
2644 if (current_user.ut.groups[i] == gid) {
2645 return True;
2646 }
2647 }
2648
2649 return False;
2650 }
2651
2652 /****************************************************************************
2653 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2654 ****************************************************************************/
2655
2656 static bool acl_group_override(connection_struct *conn,
2657 const struct smb_filename *smb_fname)
2658 {
2659 if ((errno != EPERM) && (errno != EACCES)) {
2660 return false;
2661 }
2662
2663 /* file primary group == user primary or supplementary group */
2664 if (lp_acl_group_control(SNUM(conn)) &&
2665 current_user_in_group(smb_fname->st.st_ex_gid)) {
2666 return true;
2667 }
2668
2669 /* user has writeable permission */
2670 if (lp_dos_filemode(SNUM(conn)) &&
2671 can_write_to_file(conn, smb_fname)) {
2672 return true;
2673 }
2674
2675 return false;
2676 }
2677
2678 /****************************************************************************
2679 Attempt to apply an ACL to a file or directory.
2680 ****************************************************************************/
2681
2682 static bool set_canon_ace_list(files_struct *fsp,
2683 canon_ace *the_ace,
2684 bool default_ace,
2685 const SMB_STRUCT_STAT *psbuf,
2686 bool *pacl_set_support)
2687 {
2688 connection_struct *conn = fsp->conn;
2689 bool ret = False;
2690 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2691 canon_ace *p_ace;
2692 int i;
2693 SMB_ACL_ENTRY_T mask_entry;
2694 bool got_mask_entry = False;
2695 SMB_ACL_PERMSET_T mask_permset;
2696 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2697 bool needs_mask = False;
2698 mode_t mask_perms = 0;
2699
2700 /* Use the psbuf that was passed in. */
2701 fsp->fsp_name->st = *psbuf;
2702
2703 #if defined(POSIX_ACL_NEEDS_MASK)
2704 /* HP-UX always wants to have a mask (called "class" there). */
2705 needs_mask = True;
2706 #endif
2707
2708 if (the_acl == NULL) {
2709
2710 if (!no_acl_syscall_error(errno)) {
2711 /*
2712 * Only print this error message if we have some kind of ACL
2713 * support that's not working. Otherwise we would always get this.
2714 */
2715 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2716 default_ace ? "default" : "file", strerror(errno) ));
2717 }
2718 *pacl_set_support = False;
2719 goto fail;
2720 }
2721
2722 if( DEBUGLVL( 10 )) {
2723 dbgtext("set_canon_ace_list: setting ACL:\n");
2724 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2725 print_canon_ace( p_ace, i);
2726 }
2727 }
2728
2729 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2730 SMB_ACL_ENTRY_T the_entry;
2731 SMB_ACL_PERMSET_T the_permset;
2732
2733 /*
2734 * ACLs only "need" an ACL_MASK entry if there are any named user or
2735 * named group entries. But if there is an ACL_MASK entry, it applies
2736 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2737 * so that it doesn't deny (i.e., mask off) any permissions.
2738 */
2739
2740 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2741 needs_mask = True;
2742 mask_perms |= p_ace->perms;
2743 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2744 mask_perms |= p_ace->perms;
2745 }
2746
2747 /*
2748 * Get the entry for this ACE.
2749 */
2750
2751 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2752 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2753 i, strerror(errno) ));
2754 goto fail;
2755 }
2756
2757 if (p_ace->type == SMB_ACL_MASK) {
2758 mask_entry = the_entry;
2759 got_mask_entry = True;
2760 }
2761
2762 /*
2763 * Ok - we now know the ACL calls should be working, don't
2764 * allow fallback to chmod.
2765 */
2766
2767 *pacl_set_support = True;
2768
2769 /*
2770 * Initialise the entry from the canon_ace.
2771 */
2772
2773 /*
2774 * First tell the entry what type of ACE this is.
2775 */
2776
2777 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2778 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2779 i, strerror(errno) ));
2780 goto fail;
2781 }
2782
2783 /*
2784 * Only set the qualifier (user or group id) if the entry is a user
2785 * or group id ACE.
2786 */
2787
2788 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2789 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2790 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2791 i, strerror(errno) ));
2792 goto fail;
2793 }
2794 }
2795
2796 /*
2797 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2798 */
2799
2800 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2801 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2802 i, strerror(errno) ));
2803 goto fail;
2804 }
2805
2806 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2807 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2808 (unsigned int)p_ace->perms, i, strerror(errno) ));
2809 goto fail;
2810 }
2811
2812 /*
2813 * ..and apply them to the entry.
2814 */
2815
2816 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2817 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2818 i, strerror(errno) ));
2819 goto fail;
2820 }
2821
2822 if( DEBUGLVL( 10 ))
2823 print_canon_ace( p_ace, i);
2824
2825 }
2826
2827 if (needs_mask && !got_mask_entry) {
2828 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2829 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2830 goto fail;
2831 }
2832
2833 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2834 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2835 goto fail;
2836 }
2837
2838 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2839 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2840 goto fail;
2841 }
2842
2843 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2844 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2845 goto fail;
2846 }
2847
2848 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2849 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2850 goto fail;
2851 }
2852 }
2853
2854 /*
2855 * Finally apply it to the file or directory.
2856 */
2857
2858 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2859 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2860 the_acl_type, the_acl) == -1) {
2861 /*
2862 * Some systems allow all the above calls and only fail with no ACL support
2863 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2864 */
2865 if (no_acl_syscall_error(errno)) {
2866 *pacl_set_support = False;
2867 }
2868
2869 if (acl_group_override(conn, fsp->fsp_name)) {
2870 int sret;
2871
2872 DEBUG(5,("set_canon_ace_list: acl group "
2873 "control on and current user in file "
2874 "%s primary group.\n",
2875 fsp_str_dbg(fsp)));
2876
2877 become_root();
2878 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2879 fsp->fsp_name->base_name, the_acl_type,
2880 the_acl);
2881 unbecome_root();
2882 if (sret == 0) {
2883 ret = True;
2884 }
2885 }
2886
2887 if (ret == False) {
2888 DEBUG(2,("set_canon_ace_list: "
2889 "sys_acl_set_file type %s failed for "
2890 "file %s (%s).\n",
2891 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2892 "directory default" : "file",
2893 fsp_str_dbg(fsp), strerror(errno)));
2894 goto fail;
2895 }
2896 }
2897 } else {
2898 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2899 /*
2900 * Some systems allow all the above calls and only fail with no ACL support
2901 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2902 */
2903 if (no_acl_syscall_error(errno)) {
2904 *pacl_set_support = False;
2905 }
2906
2907 if (acl_group_override(conn, fsp->fsp_name)) {
2908 int sret;
2909
2910 DEBUG(5,("set_canon_ace_list: acl group "
2911 "control on and current user in file "
2912 "%s primary group.\n",
2913 fsp_str_dbg(fsp)));
2914
2915 become_root();
2916 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2917 unbecome_root();
2918 if (sret == 0) {
2919 ret = True;
2920 }
2921 }
2922
2923 if (ret == False) {
2924 DEBUG(2,("set_canon_ace_list: "
2925 "sys_acl_set_file failed for file %s "
2926 "(%s).\n",
2927 fsp_str_dbg(fsp), strerror(errno)));
2928 goto fail;
2929 }
2930 }
2931 }
2932
2933 ret = True;
2934
2935 fail:
2936
2937 if (the_acl != NULL) {
2938 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2939 }
2940
2941 return ret;
2942 }
2943
2944 /****************************************************************************
2945 Find a particular canon_ace entry.
2946 ****************************************************************************/
2947
2948 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2949 {
2950 while (list) {
2951 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2952 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2953 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2954 break;
2955 list = list->next;
2956 }
2957 return list;
2958 }
2959
2960 /****************************************************************************
2961
2962 ****************************************************************************/
2963
2964 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2965 {
2966 SMB_ACL_ENTRY_T entry;
2967
2968 if (!the_acl)
2969 return NULL;
2970 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2971 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2972 return NULL;
2973 }
2974 return the_acl;
2975 }
2976
2977 /****************************************************************************
2978 Convert a canon_ace to a generic 3 element permission - if possible.
2979 ****************************************************************************/
2980
2981 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2982
2983 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2984 {
2985 int snum = SNUM(fsp->conn);
2986 size_t ace_count = count_canon_ace_list(file_ace_list);
2987 canon_ace *ace_p;
2988 canon_ace *owner_ace = NULL;
2989 canon_ace *group_ace = NULL;
2990 canon_ace *other_ace = NULL;
2991 mode_t and_bits;
2992 mode_t or_bits;
2993
2994 if (ace_count != 3) {
2995 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2996 "entries for file %s to convert to posix perms.\n",
2997 fsp_str_dbg(fsp)));
2998 return False;
2999 }
3000
3001 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3002 if (ace_p->owner_type == UID_ACE)
3003 owner_ace = ace_p;
3004 else if (ace_p->owner_type == GID_ACE)
3005 group_ace = ace_p;
3006 else if (ace_p->owner_type == WORLD_ACE)
3007 other_ace = ace_p;
3008 }
3009
3010 if (!owner_ace || !group_ace || !other_ace) {
3011 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3012 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3013 return False;
3014 }
3015
3016 *posix_perms = (mode_t)0;
3017
3018 *posix_perms |= owner_ace->perms;
3019 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3020 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3021 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3022 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3023 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3024 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3025
3026 /* The owner must have at least read access. */
3027
3028 *posix_perms |= S_IRUSR;
3029 if (fsp->is_directory)
3030 *posix_perms |= (S_IWUSR|S_IXUSR);
3031
3032 /* If requested apply the masks. */
3033
3034 /* Get the initial bits to apply. */
3035
3036 if (fsp->is_directory) {
3037 and_bits = lp_dir_security_mask(snum);
3038 or_bits = lp_force_dir_security_mode(snum);
3039 } else {
3040 and_bits = lp_security_mask(snum);
3041 or_bits = lp_force_security_mode(snum);
3042 }
3043
3044 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3045
3046 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3047 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3048 (int)group_ace->perms, (int)other_ace->perms,
3049 (int)*posix_perms, fsp_str_dbg(fsp)));
3050
3051 return True;
3052 }
3053
3054 /****************************************************************************
3055 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3056 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3057 with CI|OI set so it is inherited and also applies to the directory.
3058 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3059 ****************************************************************************/
3060
3061 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3062 {
3063 size_t i, j;
3064
3065 for (i = 0; i < num_aces; i++) {
3066 for (j = i+1; j < num_aces; j++) {
3067 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3068 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3069 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3070 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3071
3072 /* We know the lower number ACE's are file entries. */
3073 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3074 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3075 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3076 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3077 (i_inh == j_inh) &&
3078 (i_flags_ni == 0) &&
3079 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3080 SEC_ACE_FLAG_CONTAINER_INHERIT|
3081 SEC_ACE_FLAG_INHERIT_ONLY))) {
3082 /*
3083 * W2K wants to have access allowed zero access ACE's
3084 * at the end of the list. If the mask is zero, merge
3085 * the non-inherited ACE onto the inherited ACE.
3086 */
3087
3088 if (nt_ace_list[i].access_mask == 0) {
3089 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3090 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3091 if (num_aces - i - 1 > 0)
3092 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3093 sizeof(SEC_ACE));
3094
3095 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3096 (unsigned int)i, (unsigned int)j ));
3097 } else {
3098 /*
3099 * These are identical except for the flags.
3100 * Merge the inherited ACE onto the non-inherited ACE.
3101 */
3102
3103 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3104 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3105 if (num_aces - j - 1 > 0)
3106 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3107 sizeof(SEC_ACE));
3108
3109 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3110 (unsigned int)j, (unsigned int)i ));
3111 }
3112 num_aces--;
3113 break;
3114 }
3115 }
3116 }
3117
3118 return num_aces;
3119 }
3120
3121 /*
3122 * Add or Replace ACE entry.
3123 * In some cases we need to add a specific ACE for compatibility reasons.
3124 * When doing that we must make sure we are not actually creating a duplicate
3125 * entry. So we need to search whether an ACE entry already exist and eventually
3126 * replacce the access mask, or add a completely new entry if none was found.
3127 *
3128 * This function assumes the array has enough space to add a new entry without
3129 * any reallocation of memory.
3130 */
3131
3132 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3133 const DOM_SID *sid, enum security_ace_type type,
3134 uint32_t mask, uint8_t flags)
3135 {
3136 int i;
3137
3138 /* first search for a duplicate */
3139 for (i = 0; i < *num_aces; i++) {
3140 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3141 (nt_ace_list[i].flags == flags)) break;
3142 }
3143
3144 if (i < *num_aces) { /* found */
3145 nt_ace_list[i].type = type;
3146 nt_ace_list[i].access_mask = mask;
3147 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3148 i, sid_string_dbg(sid), flags));
3149 return;
3150 }
3151
3152 /* not found, append it */
3153 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3154 }
3155
3156
3157 /****************************************************************************
3158 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3159 the space for the return elements and returns the size needed to return the
3160 security descriptor. This should be the only external function needed for
3161 the UNIX style get ACL.
3162 ****************************************************************************/
3163
3164 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3165 const char *name,
3166 const SMB_STRUCT_STAT *sbuf,
3167 struct pai_val *pal,
3168 SMB_ACL_T posix_acl,
3169 SMB_ACL_T def_acl,
3170 uint32_t security_info,
3171 SEC_DESC **ppdesc)
3172 {
3173 DOM_SID owner_sid;
3174 DOM_SID group_sid;
3175 size_t sd_size = 0;
3176 SEC_ACL *psa = NULL;
3177 size_t num_acls = 0;
3178 size_t num_def_acls = 0;
3179 size_t num_aces = 0;
3180 canon_ace *file_ace = NULL;
3181 canon_ace *dir_ace = NULL;
3182 SEC_ACE *nt_ace_list = NULL;
3183 size_t num_profile_acls = 0;
3184 DOM_SID orig_owner_sid;
3185 SEC_DESC *psd = NULL;
3186 int i;
3187
3188 /*
3189 * Get the owner, group and world SIDs.
3190 */
3191
3192 create_file_sids(sbuf, &owner_sid, &group_sid);
3193
3194 if (lp_profile_acls(SNUM(conn))) {
3195 /* For WXP SP1 the owner must be administrators. */
3196 sid_copy(&orig_owner_sid, &owner_sid);
3197 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3198 sid_copy(&group_sid, &global_sid_Builtin_Users);
3199 num_profile_acls = 3;
3200 }
3201
3202 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3203
3204 /*
3205 * In the optimum case Creator Owner and Creator Group would be used for
3206 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3207 * would lead to usability problems under Windows: The Creator entries
3208 * are only available in browse lists of directories and not for files;
3209 * additionally the identity of the owning group couldn't be determined.
3210 * We therefore use those identities only for Default ACLs.
3211 */
3212
3213 /* Create the canon_ace lists. */
3214 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3215 &owner_sid, &group_sid, pal,
3216 SMB_ACL_TYPE_ACCESS);
3217
3218 /* We must have *some* ACLS. */
3219
3220 if (count_canon_ace_list(file_ace) == 0) {
3221 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3222 goto done;
3223 }
3224
3225 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3226 dir_ace = canonicalise_acl(conn, name, def_acl,
3227 sbuf,
3228 &global_sid_Creator_Owner,
3229 &global_sid_Creator_Group,
3230 pal, SMB_ACL_TYPE_DEFAULT);
3231 }
3232
3233 /*
3234 * Create the NT ACE list from the canonical ace lists.
3235 */
3236
3237 {
3238 canon_ace *ace;
3239 enum security_ace_type nt_acl_type;
3240
3241 if (nt4_compatible_acls() && dir_ace) {
3242 /*
3243 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3244 * but no non-INHERIT_ONLY entry for one SID. So we only
3245 * remove entries from the Access ACL if the
3246 * corresponding Default ACL entries have also been
3247 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3248 * are exceptions. We can do nothing
3249 * intelligent if the Default ACL contains entries that
3250 * are not also contained in the Access ACL, so this
3251 * case will still fail under NT 4.
3252 */
3253
3254 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3255 if (ace && !ace->perms) {
3256 DLIST_REMOVE(dir_ace, ace);
3257 SAFE_FREE(ace);
3258
3259 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3260 if (ace && !ace->perms) {
3261 DLIST_REMOVE(file_ace, ace);
3262 SAFE_FREE(ace);
3263 }
3264 }
3265
3266 /*
3267 * WinNT doesn't usually have Creator Group
3268 * in browse lists, so we send this entry to
3269 * WinNT even if it contains no relevant
3270 * permissions. Once we can add
3271 * Creator Group to browse lists we can
3272 * re-enable this.
3273 */
3274
3275 #if 0
3276 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3277 if (ace && !ace->perms) {
3278 DLIST_REMOVE(dir_ace, ace);
3279 SAFE_FREE(ace);
3280 }
3281 #endif
3282
3283 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3284 if (ace && !ace->perms) {
3285 DLIST_REMOVE(file_ace, ace);
3286 SAFE_FREE(ace);
3287 }
3288 }
3289
3290 num_acls = count_canon_ace_list(file_ace);
3291 num_def_acls = count_canon_ace_list(dir_ace);
3292
3293 /* Allocate the ace list. */
3294 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3295 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3296 goto done;
3297 }
3298
3299 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3300
3301 /*
3302 * Create the NT ACE list from the canonical ace lists.
3303 */
3304
3305 for (ace = file_ace; ace != NULL; ace = ace->next) {
3306 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3307 &nt_acl_type,
3308 ace->perms,
3309 S_ISDIR(sbuf->st_ex_mode));
3310 init_sec_ace(&nt_ace_list[num_aces++],
3311 &ace->trustee,
3312 nt_acl_type,
3313 acc,
3314 ace->ace_flags);
3315 }
3316
3317 /* The User must have access to a profile share - even
3318 * if we can't map the SID. */
3319 if (lp_profile_acls(SNUM(conn))) {
3320 add_or_replace_ace(nt_ace_list, &num_aces,
3321 &global_sid_Builtin_Users,
3322 SEC_ACE_TYPE_ACCESS_ALLOWED,
3323 FILE_GENERIC_ALL, 0);
3324 }
3325
3326 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3327 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3328 &nt_acl_type,
3329 ace->perms,
3330 S_ISDIR(sbuf->st_ex_mode));
3331 init_sec_ace(&nt_ace_list[num_aces++],
3332 &ace->trustee,
3333 nt_acl_type,
3334 acc,
3335 ace->ace_flags |
3336 SEC_ACE_FLAG_OBJECT_INHERIT|
3337 SEC_ACE_FLAG_CONTAINER_INHERIT|
3338 SEC_ACE_FLAG_INHERIT_ONLY);
3339 }
3340
3341 /* The User must have access to a profile share - even
3342 * if we can't map the SID. */
3343 if (lp_profile_acls(SNUM(conn))) {
3344 add_or_replace_ace(nt_ace_list, &num_aces,
3345 &global_sid_Builtin_Users,
3346 SEC_ACE_TYPE_ACCESS_ALLOWED,
3347 FILE_GENERIC_ALL,
3348 SEC_ACE_FLAG_OBJECT_INHERIT |
3349 SEC_ACE_FLAG_CONTAINER_INHERIT |
3350 SEC_ACE_FLAG_INHERIT_ONLY);
3351 }
3352
3353 /*
3354 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3355 * Win2K needs this to get the inheritance correct when replacing ACLs
3356 * on a directory tree. Based on work by Jim @ IBM.
3357 */
3358
3359 num_aces = merge_default_aces(nt_ace_list, num_aces);
3360
3361 if (lp_profile_acls(SNUM(conn))) {
3362 for (i = 0; i < num_aces; i++) {
3363 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3364 add_or_replace_ace(nt_ace_list, &num_aces,
3365 &orig_owner_sid,
3366 nt_ace_list[i].type,
3367 nt_ace_list[i].access_mask,
3368 nt_ace_list[i].flags);
3369 break;
3370 }
3371 }
3372 }
3373 }
3374
3375 if (num_aces) {
3376 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3377 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3378 goto done;
3379 }
3380 }
3381 } /* security_info & DACL_SECURITY_INFORMATION */
3382
3383 psd = make_standard_sec_desc( talloc_tos(),
3384 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3385 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3386 psa,
3387 &sd_size);
3388
3389 if(!psd) {
3390 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3391 sd_size = 0;
3392 goto done;
3393 }
3394
3395 /*
3396 * Windows 2000: The DACL_PROTECTED flag in the security
3397 * descriptor marks the ACL as non-inheriting, i.e., no
3398 * ACEs from higher level directories propagate to this
3399 * ACL. In the POSIX ACL model permissions are only
3400 * inherited at file create time, so ACLs never contain
3401 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3402 * flag doesn't seem to bother Windows NT.
3403 * Always set this if map acl inherit is turned off.
3404 */
3405 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3406 psd->type |= SEC_DESC_DACL_PROTECTED;
3407 } else {
3408 psd->type |= pal->sd_type;
3409 }
3410
3411 if (psd->dacl) {
3412 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3413 }
3414
3415 *ppdesc = psd;
3416
3417 done:
3418
3419 if (posix_acl) {
3420 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3421 }
3422 if (def_acl) {
3423 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3424 }
3425 free_canon_ace_list(file_ace);
3426 free_canon_ace_list(dir_ace);
3427 free_inherited_info(pal);
3428 SAFE_FREE(nt_ace_list);
3429
3430 return NT_STATUS_OK;
3431 }
3432
3433 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3434 SEC_DESC **ppdesc)
3435 {
3436 SMB_STRUCT_STAT sbuf;
3437 SMB_ACL_T posix_acl = NULL;
3438 struct pai_val *pal;
3439
3440 *ppdesc = NULL;
3441
3442 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3443 fsp_str_dbg(fsp)));
3444
3445 /* can it happen that fsp_name == NULL ? */
3446 if (fsp->is_directory || fsp->fh->fd == -1) {
3447 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3448 security_info, ppdesc);
3449 }
3450
3451 /* Get the stat struct for the owner info. */
3452 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3453 return map_nt_error_from_unix(errno);
3454 }
3455
3456 /* Get the ACL from the fd. */
3457 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3458
3459 pal = fload_inherited_info(fsp);
3460
3461 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3462 &sbuf, pal, posix_acl, NULL,
3463 security_info, ppdesc);
3464 }
3465
3466 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3467 uint32_t security_info, SEC_DESC **ppdesc)
3468 {
3469 SMB_ACL_T posix_acl = NULL;
3470 SMB_ACL_T def_acl = NULL;
3471 struct pai_val *pal;
3472 struct smb_filename smb_fname;
3473 int ret;
3474
3475 *ppdesc = NULL;
3476
3477 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3478
3479 ZERO_STRUCT(smb_fname);
3480 smb_fname.base_name = discard_const_p(char, name);
3481
3482 /* Get the stat struct for the owner info. */
3483 if (lp_posix_pathnames()) {
3484 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3485 } else {
3486 ret = SMB_VFS_STAT(conn, &smb_fname);
3487 }
3488
3489 if (ret == -1) {
3490 return map_nt_error_from_unix(errno);
3491 }
3492
3493 /* Get the ACL from the path. */
3494 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3495
3496 /* If it's a directory get the default POSIX ACL. */
3497 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3498 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3499 def_acl = free_empty_sys_acl(conn, def_acl);
3500 }
3501
3502 pal = load_inherited_info(conn, name);
3503
3504 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3505 posix_acl, def_acl, security_info,
3506 ppdesc);
3507 }
3508
3509 /****************************************************************************
3510 Try to chown a file. We will be able to chown it under the following conditions.
3511
3512 1) If we have root privileges, then it will just work.
3513 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3514 3) If we have SeRestorePrivilege we can change the user to any other user.
3515 4) If we have write permission to the file and dos_filemodes is set
3516 then allow chown to the currently authenticated user.
3517 ****************************************************************************/
3518
3519 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3520 uid_t uid, gid_t gid)
3521 {
3522 int ret;
3523 files_struct *fsp;
3524
3525 if(!CAN_WRITE(conn)) {
3526 return -1;
3527 }
3528
3529 /* Case (1). */
3530 /* try the direct way first */
3531 if (lp_posix_pathnames()) {
3532 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3533 } else {
3534 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3535 }
3536
3537 if (ret == 0)
3538 return 0;
3539
3540 /* Case (2) / (3) */
3541 if (lp_enable_privileges()) {
3542
3543 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3544 &se_take_ownership);
3545 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3546 &se_restore);
3547
3548 /* Case (2) */
3549 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3550 /* Case (3) */
3551 ( has_restore_priv ) ) {
3552
3553 become_root();
3554 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3555 if (lp_posix_pathnames()) {
3556 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3557 (gid_t)-1);
3558 } else {
3559 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3560 (gid_t)-1);
3561 }
3562 unbecome_root();
3563 return ret;
3564 }
3565 }
3566
3567 /* Case (4). */
3568 if (!lp_dos_filemode(SNUM(conn))) {
3569 errno = EPERM;
3570 return -1;
3571 }
3572
3573 /* only allow chown to the current user. This is more secure,
3574 and also copes with the case where the SID in a take ownership ACL is
3575 a local SID on the users workstation
3576 */
3577 if (uid != current_user.ut.uid) {
3578 errno = EPERM;
3579 return -1;
3580 }
3581
3582 if (lp_posix_pathnames()) {
3583 ret = SMB_VFS_LSTAT(conn, smb_fname);
3584 } else {
3585 ret = SMB_VFS_STAT(conn, smb_fname);
3586 }
3587
3588 if (ret == -1) {
3589 return -1;
3590 }
3591
3592 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3593 return -1;
3594 }
3595
3596 become_root();
3597 /* Keep the current file gid the same. */
3598 if (fsp->fh->fd == -1) {
3599 if (lp_posix_pathnames()) {
3600 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3601 (gid_t)-1);
3602 } else {
3603 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3604 (gid_t)-1);
3605 }
3606 } else {
3607 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3608 }
3609 unbecome_root();
3610
3611 close_file_fchmod(NULL, fsp);
3612
3613 return ret;
3614 }
3615
3616 #if 0
3617 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3618
3619 /****************************************************************************
3620 Take care of parent ACL inheritance.
3621 ****************************************************************************/
3622
3623 NTSTATUS append_parent_acl(files_struct *fsp,
3624 const SEC_DESC *pcsd,
3625 SEC_DESC **pp_new_sd)
3626 {
3627 struct smb_filename *smb_dname = NULL;
3628 SEC_DESC *parent_sd = NULL;
3629 files_struct *parent_fsp = NULL;
3630 TALLOC_CTX *mem_ctx = talloc_tos();
3631 char *parent_name = NULL;
3632 SEC_ACE *new_ace = NULL;
3633 unsigned int num_aces = pcsd->dacl->num_aces;
3634 NTSTATUS status;
3635 int info;
3636 unsigned int i, j;
3637 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3638 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3639
3640 if (psd == NULL) {
3641 return NT_STATUS_NO_MEMORY;
3642 }
3643
3644 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3645 NULL)) {
3646 return NT_STATUS_NO_MEMORY;
3647 }
3648
3649 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3650 &smb_dname);
3651 if (!NT_STATUS_IS_OK(status)) {
3652 goto fail;
3653 }
3654
3655 status = SMB_VFS_CREATE_FILE(
3656 fsp->conn, /* conn */
3657 NULL, /* req */
3658 0, /* root_dir_fid */
3659 smb_dname, /* fname */
3660 FILE_READ_ATTRIBUTES, /* access_mask */
3661 FILE_SHARE_NONE, /* share_access */
3662 FILE_OPEN, /* create_disposition*/
3663 FILE_DIRECTORY_FILE, /* create_options */
3664 0, /* file_attributes */
3665 INTERNAL_OPEN_ONLY, /* oplock_request */
3666 0, /* allocation_size */
3667 NULL, /* sd */
3668 NULL, /* ea_list */
3669 &parent_fsp, /* result */
3670 &info); /* pinfo */
3671
3672 if (!NT_STATUS_IS_OK(status)) {
3673 TALLOC_FREE(smb_dname);
3674 return status;
3675 }
3676
3677 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3678 DACL_SECURITY_INFORMATION, &parent_sd );
3679
3680 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3681 TALLOC_FREE(smb_dname);
3682
3683 if (!NT_STATUS_IS_OK(status)) {
3684 return status;
3685 }
3686
3687 /*
3688 * Make room for potentially all the ACLs from
3689 * the parent. We used to add the ugw triple here,
3690 * as we knew we were dealing with POSIX ACLs.
3691 * We no longer need to do so as we can guarentee
3692 * that a default ACL from the parent directory will
3693 * be well formed for POSIX ACLs if it came from a
3694 * POSIX ACL source, and if we're not writing to a
3695 * POSIX ACL sink then we don't care if it's not well
3696 * formed. JRA.
3697 */
3698
3699 num_aces += parent_sd->dacl->num_aces;
3700
3701 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3702 num_aces)) == NULL) {
3703 return NT_STATUS_NO_MEMORY;
3704 }
3705
3706 /* Start by copying in all the given ACE entries. */
3707 for (i = 0; i < psd->dacl->num_aces; i++) {
3708 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3709 }
3710
3711 /*
3712 * Note that we're ignoring "inherit permissions" here
3713 * as that really only applies to newly created files. JRA.
3714 */
3715
3716 /* Finally append any inherited ACEs. */
3717 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3718 SEC_ACE *se = &parent_sd->dacl->aces[j];
3719
3720 if (fsp->is_directory) {
3721 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3722 /* Doesn't apply to a directory - ignore. */
3723 DEBUG(10,("append_parent_acl: directory %s "
3724 "ignoring non container "
3725 "inherit flags %u on ACE with sid %s "
3726 "from parent %s\n",
3727 fsp_str_dbg(fsp),
3728 (unsigned int)se->flags,
3729 sid_string_dbg(&se->trustee),
3730 parent_name));
3731 continue;
3732 }
3733 } else {
3734 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3735 /* Doesn't apply to a file - ignore. */
3736 DEBUG(10,("append_parent_acl: file %s "
3737 "ignoring non object "
3738 "inherit flags %u on ACE with sid %s "
3739 "from parent %s\n",
3740 fsp_str_dbg(fsp),
3741 (unsigned int)se->flags,
3742 sid_string_dbg(&se->trustee),
3743 parent_name));
3744 continue;
3745 }
3746 }
3747
3748 if (is_dacl_protected) {
3749 /* If the DACL is protected it means we must
3750 * not overwrite an existing ACE entry with the
3751 * same SID. This is order N^2. Ouch :-(. JRA. */
3752 unsigned int k;
3753 for (k = 0; k < psd->dacl->num_aces; k++) {
3754 if (sid_equal(&psd->dacl->aces[k].trustee,
3755 &se->trustee)) {
3756 break;
3757 }
3758 }
3759 if (k < psd->dacl->num_aces) {
3760 /* SID matched. Ignore. */
3761 DEBUG(10,("append_parent_acl: path %s "
3762 "ignoring ACE with protected sid %s "
3763 "from parent %s\n",
3764 fsp_str_dbg(fsp),
3765 sid_string_dbg(&se->trustee),
3766 parent_name));
3767 continue;
3768 }
3769 }
3770
3771 sec_ace_copy(&new_ace[i], se);
3772 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3773 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3774 }
3775 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3776
3777 if (fsp->is_directory) {
3778 /*
3779 * Strip off any inherit only. It's applied.
3780 */
3781 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3782 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3783 /* No further inheritance. */
3784 new_ace[i].flags &=
3785 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3786 SEC_ACE_FLAG_OBJECT_INHERIT);
3787 }
3788 } else {
3789 /*
3790 * Strip off any container or inherit
3791 * flags, they can't apply to objects.
3792 */
3793 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3794 SEC_ACE_FLAG_INHERIT_ONLY|
3795 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3796 }
3797 i++;
3798
3799 DEBUG(10,("append_parent_acl: path %s "
3800 "inheriting ACE with sid %s "
3801 "from parent %s\n",
3802 fsp_str_dbg(fsp),
3803 sid_string_dbg(&se->trustee),
3804 parent_name));
3805 }
3806
3807 psd->dacl->aces = new_ace;
3808 psd->dacl->num_aces = i;
3809 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3810 SE_DESC_DACL_AUTO_INHERIT_REQ);
3811
3812 *pp_new_sd = psd;
3813 return status;
3814 }
3815 #endif
3816
3817 /****************************************************************************
3818 Reply to set a security descriptor on an fsp. security_info_sent is the
3819 description of the following NT ACL.
3820 This should be the only external function needed for the UNIX style set ACL.
3821 ****************************************************************************/
3822
3823 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3824 {
3825 connection_struct *conn = fsp->conn;
3826 uid_t user = (uid_t)-1;
3827 gid_t grp = (gid_t)-1;
3828 DOM_SID file_owner_sid;
3829 DOM_SID file_grp_sid;
3830 canon_ace *file_ace_list = NULL;
3831 canon_ace *dir_ace_list = NULL;
3832 bool acl_perms = False;
3833 mode_t orig_mode = (mode_t)0;
3834 NTSTATUS status;
3835 bool set_acl_as_root = false;
3836 bool acl_set_support = false;
3837 bool ret = false;
3838
3839 DEBUG(10,("set_nt_acl: called for file %s\n",
3840 fsp_str_dbg(fsp)));
3841
3842 if (!CAN_WRITE(conn)) {
3843 DEBUG(10,("set acl rejected on read-only share\n"));
3844 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3845 }
3846
3847 /*
3848 * Get the current state of the file.
3849 */
3850
3851 status = vfs_stat_fsp(fsp);
3852 if (!NT_STATUS_IS_OK(status)) {
3853 return status;
3854 }
3855
3856 /* Save the original element we check against. */
3857 orig_mode = fsp->fsp_name->st.st_ex_mode;
3858
3859 /*
3860 * Unpack the user/group/world id's.
3861 */
3862
3863 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3864 if (!NT_STATUS_IS_OK(status)) {
3865 return status;
3866 }
3867
3868 /*
3869 * Do we need to chown ? If so this must be done first as the incoming
3870 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3871 * Noticed by Simo.
3872 */
3873
3874 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3875 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3876
3877 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3878 fsp_str_dbg(fsp), (unsigned int)user,
3879 (unsigned int)grp));
3880
3881 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3882 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3883 "= %s.\n", fsp_str_dbg(fsp),
3884 (unsigned int)user, (unsigned int)grp,
3885 strerror(errno)));
3886 if (errno == EPERM) {
3887 return NT_STATUS_INVALID_OWNER;
3888 }
3889 return map_nt_error_from_unix(errno);
3890 }
3891
3892 /*
3893 * Recheck the current state of the file, which may have changed.
3894 * (suid/sgid bits, for instance)
3895 */
3896
3897 status = vfs_stat_fsp(fsp);
3898 if (!NT_STATUS_IS_OK(status)) {
3899 return status;
3900 }
3901
3902 /* Save the original element we check against. */
3903 orig_mode = fsp->fsp_name->st.st_ex_mode;
3904
3905 /* If we successfully chowned, we know we must
3906 * be able to set the acl, so do it as root.
3907 */
3908 set_acl_as_root = true;
3909 }
3910
3911 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3912
3913 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3914 &file_grp_sid, &file_ace_list,
3915 &dir_ace_list, security_info_sent, psd);
3916
3917 /* Ignore W2K traverse DACL set. */
3918 if (!file_ace_list && !dir_ace_list) {
3919 return NT_STATUS_OK;
3920 }
3921
3922 if (!acl_perms) {
3923 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3924 free_canon_ace_list(file_ace_list);
3925 free_canon_ace_list(dir_ace_list);
3926 return NT_STATUS_ACCESS_DENIED;
3927 }
3928
3929 /*
3930 * Only change security if we got a DACL.
3931 */
3932
3933 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3934 free_canon_ace_list(file_ace_list);
3935 free_canon_ace_list(dir_ace_list);
3936 return NT_STATUS_OK;
3937 }
3938
3939 /*
3940 * Try using the POSIX ACL set first. Fall back to chmod if
3941 * we have no ACL support on this filesystem.
3942 */
3943
3944 if (acl_perms && file_ace_list) {
3945 if (set_acl_as_root) {
3946 become_root();
3947 }
3948 ret = set_canon_ace_list(fsp, file_ace_list, false,
3949 &fsp->fsp_name->st, &acl_set_support);
3950 if (set_acl_as_root) {
3951 unbecome_root();
3952 }
3953 if (acl_set_support && ret == false) {
3954 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3955 "%s (%s).\n", fsp_str_dbg(fsp),
3956 strerror(errno)));
3957 free_canon_ace_list(file_ace_list);
3958 free_canon_ace_list(dir_ace_list);
3959 return map_nt_error_from_unix(errno);
3960 }
3961 }
3962
3963 if (acl_perms && acl_set_support && fsp->is_directory) {
3964 if (dir_ace_list) {
3965 if (set_acl_as_root) {
3966 become_root();
3967 }
3968 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3969 &fsp->fsp_name->st,
3970 &acl_set_support);
3971 if (set_acl_as_root) {
3972 unbecome_root();
3973 }
3974 if (ret == false) {
3975 DEBUG(3,("set_nt_acl: failed to set default "
3976 "acl on directory %s (%s).\n",
3977 fsp_str_dbg(fsp), strerror(errno)));
3978 free_canon_ace_list(file_ace_list);
3979 free_canon_ace_list(dir_ace_list);
3980 return map_nt_error_from_unix(errno);
3981 }
3982 } else {
3983 int sret = -1;
3984
3985 /*
3986 * No default ACL - delete one if it exists.
3987 */
3988
3989 if (set_acl_as_root) {
3990 become_root();
3991 }
3992 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3993 fsp->fsp_name->base_name);
3994 if (set_acl_as_root) {
3995 unbecome_root();
3996 }
3997 if (sret == -1) {
3998 if (acl_group_override(conn, fsp->fsp_name)) {
3999 DEBUG(5,("set_nt_acl: acl group "
4000 "control on and current user "
4001 "in file %s primary group. "
4002 "Override delete_def_acl\n",
4003 fsp_str_dbg(fsp)));
4004
4005 become_root();
4006 sret =
4007 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4008 conn,
4009 fsp->fsp_name->base_name);
4010 unbecome_root();
4011 }
4012
4013 if (sret == -1) {
4014 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4015 free_canon_ace_list(file_ace_list);
4016 free_canon_ace_list(dir_ace_list);
4017 return map_nt_error_from_unix(errno);
4018 }
4019 }
4020 }
4021 }
4022
4023 if (acl_set_support) {
4024 if (set_acl_as_root) {
4025 become_root();
4026 }
4027 store_inheritance_attributes(fsp,
4028 file_ace_list,
4029 dir_ace_list,
4030 psd->type);
4031 if (set_acl_as_root) {
4032 unbecome_root();
4033 }
4034 }
4035
4036 /*
4037 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4038 */
4039
4040 if(!acl_set_support && acl_perms) {
4041 mode_t posix_perms;
4042
4043 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4044 free_canon_ace_list(file_ace_list);
4045 free_canon_ace_list(dir_ace_list);
4046 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4047 "posix permissions for file %s.\n",
4048 fsp_str_dbg(fsp)));
4049 return NT_STATUS_ACCESS_DENIED;
4050 }
4051
4052 if (orig_mode != posix_perms) {
4053 int sret = -1;
4054
4055 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4056 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4057
4058 if (set_acl_as_root) {
4059 become_root();
4060 }
4061 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4062 posix_perms);
4063 if (set_acl_as_root) {
4064 unbecome_root();
4065 }
4066 if(sret == -1) {
4067 if (acl_group_override(conn, fsp->fsp_name)) {
4068 DEBUG(5,("set_nt_acl: acl group "
4069 "control on and current user "
4070 "in file %s primary group. "
4071 "Override chmod\n",
4072 fsp_str_dbg(fsp)));
4073
4074 become_root();
4075 sret = SMB_VFS_CHMOD(conn,
4076 fsp->fsp_name->base_name,
4077 posix_perms);
4078 unbecome_root();
4079 }
4080
4081 if (sret == -1) {
4082 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4083 "failed. Error = %s.\n",
4084 fsp_str_dbg(fsp),
4085 (unsigned int)posix_perms,
4086 strerror(errno)));
4087 free_canon_ace_list(file_ace_list);
4088 free_canon_ace_list(dir_ace_list);
4089 return map_nt_error_from_unix(errno);
4090 }
4091 }
4092 }
4093 }
4094
4095 free_canon_ace_list(file_ace_list);
4096 free_canon_ace_list(dir_ace_list);
4097
4098 /* Ensure the stat struct in the fsp is correct. */
4099 status = vfs_stat_fsp(fsp);
4100
4101 return NT_STATUS_OK;
4102 }
4103
4104 /****************************************************************************
4105 Get the actual group bits stored on a file with an ACL. Has no effect if
4106 the file has no ACL. Needed in dosmode code where the stat() will return
4107 the mask bits, not the real group bits, for a file with an ACL.
4108 ****************************************************************************/
4109
4110 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4111 {
4112 int entry_id = SMB_ACL_FIRST_ENTRY;
4113 SMB_ACL_ENTRY_T entry;
4114 SMB_ACL_T posix_acl;
4115 int result = -1;
4116
4117 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4118 if (posix_acl == (SMB_ACL_T)NULL)
4119 return -1;
4120
4121 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4122 SMB_ACL_TAG_T tagtype;
4123 SMB_ACL_PERMSET_T permset;
4124
4125 entry_id = SMB_ACL_NEXT_ENTRY;
4126
4127 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4128 break;
4129
4130 if (tagtype == SMB_ACL_GROUP_OBJ) {
4131 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4132 break;
4133 } else {
4134 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4135 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4136 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4137 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4138 result = 0;
4139 break;
4140 }
4141 }
4142 }
4143 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4144 return result;
4145 }
4146
4147 /****************************************************************************
4148 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4149 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4150 ****************************************************************************/
4151
4152 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4153 {
4154 int entry_id = SMB_ACL_FIRST_ENTRY;
4155 SMB_ACL_ENTRY_T entry;
4156 int num_entries = 0;
4157
4158 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4159 SMB_ACL_TAG_T tagtype;
4160 SMB_ACL_PERMSET_T permset;
4161 mode_t perms;
4162
4163 entry_id = SMB_ACL_NEXT_ENTRY;
4164
4165 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4166 return -1;
4167
4168 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4169 return -1;
4170
4171 num_entries++;
4172
4173 switch(tagtype) {
4174 case SMB_ACL_USER_OBJ:
4175 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4176 break;
4177 case SMB_ACL_GROUP_OBJ:
4178 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4179 break;
4180 case SMB_ACL_MASK:
4181 /*
4182 * FIXME: The ACL_MASK entry permissions should really be set to
4183 * the union of the permissions of all ACL_USER,
4184 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4185 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4186 */
4187 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4188 break;
4189 case SMB_ACL_OTHER:
4190 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4191 break;
4192 default:
4193 continue;
4194 }
4195
4196 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4197 return -1;
4198
4199 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4200 return -1;
4201 }
4202
4203 /*
4204 * If this is a simple 3 element ACL or no elements then it's a standard
4205 * UNIX permission set. Just use chmod...
4206 */
4207
4208 if ((num_entries == 3) || (num_entries == 0))
4209 return -1;
4210
4211 return 0;
4212 }
4213
4214 /****************************************************************************
4215 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4216 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4217 resulting ACL on TO. Note that name is in UNIX character set.
4218 ****************************************************************************/
4219
4220 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4221 {
4222 SMB_ACL_T posix_acl = NULL;
4223 int ret = -1;
4224
4225 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4226 return -1;
4227
4228 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4229 goto done;
4230
4231 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4232
4233 done:
4234
4235 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4236 return ret;
4237 }
4238
4239 /****************************************************************************
4240 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4241 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4242 Note that name is in UNIX character set.
4243 ****************************************************************************/
4244
4245 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4246 {
4247 return copy_access_posix_acl(conn, name, name, mode);
4248 }
4249
4250 /****************************************************************************
4251 Check for an existing default POSIX ACL on a directory.
4252 ****************************************************************************/
4253
4254 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4255 {
4256 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4257 bool has_acl = False;
4258 SMB_ACL_ENTRY_T entry;
4259
4260 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4261 has_acl = True;
4262 }
4263
4264 if (def_acl) {
4265 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4266 }
4267 return has_acl;
4268 }
4269
4270 /****************************************************************************
4271 If the parent directory has no default ACL but it does have an Access ACL,
4272 inherit this Access ACL to file name.
4273 ****************************************************************************/
4274
4275 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4276 const char *name, mode_t mode)
4277 {
4278 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4279 return 0;
4280
4281 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4282 }
4283
4284 /****************************************************************************
4285 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4286 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4287 ****************************************************************************/
4288
4289 int fchmod_acl(files_struct *fsp, mode_t mode)
4290 {
4291 connection_struct *conn = fsp->conn;
4292 SMB_ACL_T posix_acl = NULL;
4293 int ret = -1;
4294
4295 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4296 return -1;
4297
4298 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4299 goto done;
4300
4301 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4302
4303 done:
4304
4305 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4306 return ret;
4307 }
4308
4309 /****************************************************************************
4310 Map from wire type to permset.
4311 ****************************************************************************/
4312
4313 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4314 {
4315 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4316 return False;
4317 }
4318
4319 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4320 return False;
4321 }
4322
4323 if (wire_perm & SMB_POSIX_ACL_READ) {
4324 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4325 return False;
4326 }
4327 }
4328 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4329 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4330 return False;
4331 }
4332 }
4333 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4334 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4335 return False;
4336 }
4337 }
4338 return True;
4339 }
4340
4341 /****************************************************************************
4342 Map from wire type to tagtype.
4343 ****************************************************************************/
4344
4345 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4346 {
4347 switch (wire_tt) {
4348 case SMB_POSIX_ACL_USER_OBJ:
4349 *p_tt = SMB_ACL_USER_OBJ;
4350 break;
4351 case SMB_POSIX_ACL_USER:
4352 *p_tt = SMB_ACL_USER;
4353 break;
4354 case SMB_POSIX_ACL_GROUP_OBJ:
4355 *p_tt = SMB_ACL_GROUP_OBJ;
4356 break;
4357 case SMB_POSIX_ACL_GROUP:
4358 *p_tt = SMB_ACL_GROUP;
4359 break;
4360 case SMB_POSIX_ACL_MASK:
4361 *p_tt = SMB_ACL_MASK;
4362 break;
4363 case SMB_POSIX_ACL_OTHER:
4364 *p_tt = SMB_ACL_OTHER;
4365 break;
4366 default:
4367 return False;
4368 }
4369 return True;
4370 }
4371
4372 /****************************************************************************
4373 Create a new POSIX acl from wire permissions.
4374 FIXME ! How does the share mask/mode fit into this.... ?
4375 ****************************************************************************/
4376
4377 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4378 {
4379 unsigned int i;
4380 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4381
4382 if (the_acl == NULL) {
4383 return NULL;
4384 }
4385
4386 for (i = 0; i < num_acls; i++) {
4387 SMB_ACL_ENTRY_T the_entry;
4388 SMB_ACL_PERMSET_T the_permset;
4389 SMB_ACL_TAG_T tag_type;
4390
4391 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4392 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4393 i, strerror(errno) ));
4394 goto fail;
4395 }
4396
4397 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4398 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4399 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4400 goto fail;
4401 }
4402
4403 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4404 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4405 i, strerror(errno) ));
4406 goto fail;
4407 }
4408
4409 /* Get the permset pointer from the new ACL entry. */
4410 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4411 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4412 i, strerror(errno) ));
4413 goto fail;
4414 }
4415
4416 /* Map from wire to permissions. */
4417 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4418 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4419 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4420 goto fail;
4421 }
4422
4423 /* Now apply to the new ACL entry. */
4424 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4425 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4426 i, strerror(errno) ));
4427 goto fail;
4428 }
4429
4430 if (tag_type == SMB_ACL_USER) {
4431 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4432 uid_t uid = (uid_t)uidval;
4433 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4434 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4435 (unsigned int)uid, i, strerror(errno) ));
4436 goto fail;
4437 }
4438 }
4439
4440 if (tag_type == SMB_ACL_GROUP) {
4441 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4442 gid_t gid = (uid_t)gidval;
4443 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4444 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4445 (unsigned int)gid, i, strerror(errno) ));
4446 goto fail;
4447 }
4448 }
4449 }
4450
4451 return the_acl;
4452
4453 fail:
4454
4455 if (the_acl != NULL) {
4456 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4457 }
4458 return NULL;
4459 }
4460
4461 /****************************************************************************
4462 Calls from UNIX extensions - Default POSIX ACL set.
4463 If num_def_acls == 0 and not a directory just return. If it is a directory
4464 and num_def_acls == 0 then remove the default acl. Else set the default acl
4465 on the directory.
4466 ****************************************************************************/
4467
4468 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4469 uint16 num_def_acls, const char *pdata)
4470 {
4471 SMB_ACL_T def_acl = NULL;
4472
4473 if (!S_ISDIR(psbuf->st_ex_mode)) {
4474 if (num_def_acls) {
4475 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4476 errno = EISDIR;
4477 return False;
4478 } else {
4479 return True;
4480 }
4481 }
4482
4483 if (!num_def_acls) {
4484 /* Remove the default ACL. */
4485 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4486 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4487 fname, strerror(errno) ));
4488 return False;
4489 }
4490 return True;
4491 }
4492
4493 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4494 return False;
4495 }
4496
4497 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4498 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4499 fname, strerror(errno) ));
4500 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4501 return False;
4502 }
4503
4504 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4505 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4506 return True;
4507 }
4508
4509 /****************************************************************************
4510 Remove an ACL from a file. As we don't have acl_delete_entry() available
4511 we must read the current acl and copy all entries except MASK, USER and GROUP
4512 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4513 removed.
4514 FIXME ! How does the share mask/mode fit into this.... ?
4515 ****************************************************************************/
4516
4517 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4518 {
4519 SMB_ACL_T file_acl = NULL;
4520 int entry_id = SMB_ACL_FIRST_ENTRY;
4521 SMB_ACL_ENTRY_T entry;
4522 bool ret = False;
4523 /* Create a new ACL with only 3 entries, u/g/w. */
4524 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4525 SMB_ACL_ENTRY_T user_ent = NULL;
4526 SMB_ACL_ENTRY_T group_ent = NULL;
4527 SMB_ACL_ENTRY_T other_ent = NULL;
4528
4529 if (new_file_acl == NULL) {
4530 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4531 return False;
4532 }
4533
4534 /* Now create the u/g/w entries. */
4535 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4536 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4537 fname, strerror(errno) ));
4538 goto done;
4539 }
4540 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4541 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4542 fname, strerror(errno) ));
4543 goto done;
4544 }
4545
4546 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4547 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4548 fname, strerror(errno) ));
4549 goto done;
4550 }
4551 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4552 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4553 fname, strerror(errno) ));
4554 goto done;
4555 }
4556
4557 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4558 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4559 fname, strerror(errno) ));
4560 goto done;
4561 }
4562 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4563 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4564 fname, strerror(errno) ));
4565 goto done;
4566 }
4567
4568 /* Get the current file ACL. */
4569 if (fsp && fsp->fh->fd != -1) {
4570 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4571 } else {
4572 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4573 }
4574
4575 if (file_acl == NULL) {
4576 /* This is only returned if an error occurred. Even for a file with
4577 no acl a u/g/w acl should be returned. */
4578 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4579 fname, strerror(errno) ));
4580 goto done;
4581 }
4582
4583 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4584 SMB_ACL_TAG_T tagtype;
4585 SMB_ACL_PERMSET_T permset;
4586
4587 entry_id = SMB_ACL_NEXT_ENTRY;
4588
4589 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4590 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4591 fname, strerror(errno) ));
4592 goto done;
4593 }
4594
4595 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4596 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4597 fname, strerror(errno) ));
4598 goto done;
4599 }
4600
4601 if (tagtype == SMB_ACL_USER_OBJ) {
4602 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4603 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4604 fname, strerror(errno) ));
4605 }
4606 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4607 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4608 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4609 fname, strerror(errno) ));
4610 }
4611 } else if (tagtype == SMB_ACL_OTHER) {
4612 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4613 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4614 fname, strerror(errno) ));
4615 }
4616 }
4617 }
4618
4619 /* Set the new empty file ACL. */
4620 if (fsp && fsp->fh->fd != -1) {
4621 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4622 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4623 fname, strerror(errno) ));
4624 goto done;
4625 }
4626 } else {
4627 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4628 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4629 fname, strerror(errno) ));
4630 goto done;
4631 }
4632 }
4633
4634 ret = True;
4635
4636 done:
4637
4638 if (file_acl) {
4639 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4640 }
4641 if (new_file_acl) {
4642 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4643 }
4644 return ret;
4645 }
4646
4647 /****************************************************************************
4648 Calls from UNIX extensions - POSIX ACL set.
4649 If num_def_acls == 0 then read/modify/write acl after removing all entries
4650 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4651 ****************************************************************************/
4652
4653 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4654 {
4655 SMB_ACL_T file_acl = NULL;
4656
4657 if (!num_acls) {
4658 /* Remove the ACL from the file. */
4659 return remove_posix_acl(conn, fsp, fname);
4660 }
4661
4662 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4663 return False;
4664 }
4665
4666 if (fsp && fsp->fh->fd != -1) {
4667 /* The preferred way - use an open fd. */
4668 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4669 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4670 fname, strerror(errno) ));
4671 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4672 return False;
4673 }
4674 } else {
4675 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4676 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4677 fname, strerror(errno) ));
4678 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4679 return False;
4680 }
4681 }
4682
4683 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4684 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4685 return True;
4686 }
4687
4688 /********************************************************************
4689 Pull the NT ACL from a file on disk or the OpenEventlog() access
4690 check. Caller is responsible for freeing the returned security
4691 descriptor via TALLOC_FREE(). This is designed for dealing with
4692 user space access checks in smbd outside of the VFS. For example,
4693 checking access rights in OpenEventlog().
4694
4695 Assume we are dealing with files (for now)
4696 ********************************************************************/
4697
4698 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4699 {
4700 SEC_DESC *psd, *ret_sd;
4701 connection_struct *conn;
4702 files_struct finfo;
4703 struct fd_handle fh;
4704 NTSTATUS status;
4705
4706 conn = TALLOC_ZERO_P(ctx, connection_struct);
4707 if (conn == NULL) {
4708 DEBUG(0, ("talloc failed\n"));
4709 return NULL;
4710 }
4711
4712 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4713 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4714 TALLOC_FREE(conn);
4715 return NULL;
4716 }
4717
4718 conn->params->service = -1;
4719
4720 set_conn_connectpath(conn, "/");
4721
4722 if (!smbd_vfs_init(conn)) {
4723 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4724 conn_free(conn);
4725 return NULL;
4726 }
4727
4728 ZERO_STRUCT( finfo );
4729 ZERO_STRUCT( fh );
4730
4731 finfo.fnum = -1;
4732 finfo.conn = conn;
4733 finfo.fh = &fh;
4734 finfo.fh->fd = -1;
4735
4736 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4737 &finfo.fsp_name);
4738 if (!NT_STATUS_IS_OK(status)) {
4739 conn_free(conn);
4740 return NULL;
4741 }
4742
4743 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4744 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4745 TALLOC_FREE(finfo.fsp_name);
4746 conn_free(conn);
4747 return NULL;
4748 }
4749
4750 ret_sd = dup_sec_desc( ctx, psd );
4751
4752 TALLOC_FREE(finfo.fsp_name);
4753 conn_free(conn);
4754
4755 return ret_sd;
4756 }
reg import