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s4:upgradeprovision Rework script, and reset machine account pw
[Samba/cd1.git] / source3 / smbd / posix_acls.c
blob65d0929024f558dfea28bd01f2fd6dc243d742bb
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 static 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 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1113 (unsigned int)perms, (unsigned int)nt_mask ));
1114
1115 return nt_mask;
1116 }
1117
1118 /****************************************************************************
1119 Map NT perms to a UNIX mode_t.
1120 ****************************************************************************/
1121
1122 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1123 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1124 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1125
1126 static mode_t map_nt_perms( uint32 *mask, int type)
1127 {
1128 mode_t mode = 0;
1129
1130 switch(type) {
1131 case S_IRUSR:
1132 if((*mask) & GENERIC_ALL_ACCESS)
1133 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1134 else {
1135 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1136 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1137 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1138 }
1139 break;
1140 case S_IRGRP:
1141 if((*mask) & GENERIC_ALL_ACCESS)
1142 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1143 else {
1144 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1145 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1146 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1147 }
1148 break;
1149 case S_IROTH:
1150 if((*mask) & GENERIC_ALL_ACCESS)
1151 mode = S_IROTH|S_IWOTH|S_IXOTH;
1152 else {
1153 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1154 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1155 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1156 }
1157 break;
1158 }
1159
1160 return mode;
1161 }
1162
1163 /****************************************************************************
1164 Unpack a SEC_DESC into a UNIX owner and group.
1165 ****************************************************************************/
1166
1167 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1168 {
1169 DOM_SID owner_sid;
1170 DOM_SID grp_sid;
1171
1172 *puser = (uid_t)-1;
1173 *pgrp = (gid_t)-1;
1174
1175 if(security_info_sent == 0) {
1176 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1177 return NT_STATUS_OK;
1178 }
1179
1180 /*
1181 * Validate the owner and group SID's.
1182 */
1183
1184 memset(&owner_sid, '\0', sizeof(owner_sid));
1185 memset(&grp_sid, '\0', sizeof(grp_sid));
1186
1187 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1188
1189 /*
1190 * Don't immediately fail if the owner sid cannot be validated.
1191 * This may be a group chown only set.
1192 */
1193
1194 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1195 sid_copy(&owner_sid, psd->owner_sid);
1196 if (!sid_to_uid(&owner_sid, puser)) {
1197 if (lp_force_unknown_acl_user(snum)) {
1198 /* this allows take ownership to work
1199 * reasonably */
1200 *puser = current_user.ut.uid;
1201 } else {
1202 DEBUG(3,("unpack_nt_owners: unable to validate"
1203 " owner sid for %s\n",
1204 sid_string_dbg(&owner_sid)));
1205 return NT_STATUS_INVALID_OWNER;
1206 }
1207 }
1208 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1209 (unsigned int)*puser ));
1210 }
1211
1212 /*
1213 * Don't immediately fail if the group sid cannot be validated.
1214 * This may be an owner chown only set.
1215 */
1216
1217 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1218 sid_copy(&grp_sid, psd->group_sid);
1219 if (!sid_to_gid( &grp_sid, pgrp)) {
1220 if (lp_force_unknown_acl_user(snum)) {
1221 /* this allows take group ownership to work
1222 * reasonably */
1223 *pgrp = current_user.ut.gid;
1224 } else {
1225 DEBUG(3,("unpack_nt_owners: unable to validate"
1226 " group sid.\n"));
1227 return NT_STATUS_INVALID_OWNER;
1228 }
1229 }
1230 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1231 (unsigned int)*pgrp));
1232 }
1233
1234 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1235
1236 return NT_STATUS_OK;
1237 }
1238
1239 /****************************************************************************
1240 Ensure the enforced permissions for this share apply.
1241 ****************************************************************************/
1242
1243 static void apply_default_perms(const struct share_params *params,
1244 const bool is_directory, canon_ace *pace,
1245 mode_t type)
1246 {
1247 mode_t and_bits = (mode_t)0;
1248 mode_t or_bits = (mode_t)0;
1249
1250 /* Get the initial bits to apply. */
1251
1252 if (is_directory) {
1253 and_bits = lp_dir_security_mask(params->service);
1254 or_bits = lp_force_dir_security_mode(params->service);
1255 } else {
1256 and_bits = lp_security_mask(params->service);
1257 or_bits = lp_force_security_mode(params->service);
1258 }
1259
1260 /* Now bounce them into the S_USR space. */
1261 switch(type) {
1262 case S_IRUSR:
1263 /* Ensure owner has read access. */
1264 pace->perms |= S_IRUSR;
1265 if (is_directory)
1266 pace->perms |= (S_IWUSR|S_IXUSR);
1267 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1268 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1269 break;
1270 case S_IRGRP:
1271 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1272 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1273 break;
1274 case S_IROTH:
1275 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1276 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1277 break;
1278 }
1279
1280 pace->perms = ((pace->perms & and_bits)|or_bits);
1281 }
1282
1283 /****************************************************************************
1284 Check if a given uid/SID is in a group gid/SID. This is probably very
1285 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1286 ****************************************************************************/
1287
1288 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1289 {
1290 const char *u_name = NULL;
1291
1292 /* "Everyone" always matches every uid. */
1293
1294 if (sid_equal(&group_ace->trustee, &global_sid_World))
1295 return True;
1296
1297 /*
1298 * if it's the current user, we already have the unix token
1299 * and don't need to do the complex user_in_group_sid() call
1300 */
1301 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1302 size_t i;
1303
1304 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1305 return True;
1306 }
1307
1308 for (i=0; i < current_user.ut.ngroups; i++) {
1309 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1310 return True;
1311 }
1312 }
1313 }
1314
1315 /* u_name talloc'ed off tos. */
1316 u_name = uidtoname(uid_ace->unix_ug.uid);
1317 if (!u_name) {
1318 return False;
1319 }
1320
1321 /*
1322 * user_in_group_sid() uses create_token_from_username()
1323 * which creates an artificial NT token given just a username,
1324 * so this is not reliable for users from foreign domains
1325 * exported by winbindd!
1326 */
1327 return user_in_group_sid(u_name, &group_ace->trustee);
1328 }
1329
1330 /****************************************************************************
1331 A well formed POSIX file or default ACL has at least 3 entries, a
1332 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1333 In addition, the owner must always have at least read access.
1334 When using this call on get_acl, the pst struct is valid and contains
1335 the mode of the file. When using this call on set_acl, the pst struct has
1336 been modified to have a mode containing the default for this file or directory
1337 type.
1338 ****************************************************************************/
1339
1340 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1341 const struct share_params *params,
1342 const bool is_directory,
1343 const DOM_SID *pfile_owner_sid,
1344 const DOM_SID *pfile_grp_sid,
1345 const SMB_STRUCT_STAT *pst,
1346 bool setting_acl)
1347 {
1348 canon_ace *pace;
1349 bool got_user = False;
1350 bool got_grp = False;
1351 bool got_other = False;
1352 canon_ace *pace_other = NULL;
1353
1354 for (pace = *pp_ace; pace; pace = pace->next) {
1355 if (pace->type == SMB_ACL_USER_OBJ) {
1356
1357 if (setting_acl)
1358 apply_default_perms(params, is_directory, pace, S_IRUSR);
1359 got_user = True;
1360
1361 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1362
1363 /*
1364 * Ensure create mask/force create mode is respected on set.
1365 */
1366
1367 if (setting_acl)
1368 apply_default_perms(params, is_directory, pace, S_IRGRP);
1369 got_grp = True;
1370
1371 } else if (pace->type == SMB_ACL_OTHER) {
1372
1373 /*
1374 * Ensure create mask/force create mode is respected on set.
1375 */
1376
1377 if (setting_acl)
1378 apply_default_perms(params, is_directory, pace, S_IROTH);
1379 got_other = True;
1380 pace_other = pace;
1381 }
1382 }
1383
1384 if (!got_user) {
1385 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1386 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1387 return False;
1388 }
1389
1390 ZERO_STRUCTP(pace);
1391 pace->type = SMB_ACL_USER_OBJ;
1392 pace->owner_type = UID_ACE;
1393 pace->unix_ug.uid = pst->st_ex_uid;
1394 pace->trustee = *pfile_owner_sid;
1395 pace->attr = ALLOW_ACE;
1396
1397 if (setting_acl) {
1398 /* See if the owning user is in any of the other groups in
1399 the ACE. If so, OR in the permissions from that group. */
1400
1401 bool group_matched = False;
1402 canon_ace *pace_iter;
1403
1404 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1405 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1406 if (uid_entry_in_group(pace, pace_iter)) {
1407 pace->perms |= pace_iter->perms;
1408 group_matched = True;
1409 }
1410 }
1411 }
1412
1413 /* If we only got an "everyone" perm, just use that. */
1414 if (!group_matched) {
1415 if (got_other)
1416 pace->perms = pace_other->perms;
1417 else
1418 pace->perms = 0;
1419 }
1420
1421 apply_default_perms(params, is_directory, pace, S_IRUSR);
1422 } else {
1423 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1424 }
1425
1426 DLIST_ADD(*pp_ace, pace);
1427 }
1428
1429 if (!got_grp) {
1430 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1431 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1432 return False;
1433 }
1434
1435 ZERO_STRUCTP(pace);
1436 pace->type = SMB_ACL_GROUP_OBJ;
1437 pace->owner_type = GID_ACE;
1438 pace->unix_ug.uid = pst->st_ex_gid;
1439 pace->trustee = *pfile_grp_sid;
1440 pace->attr = ALLOW_ACE;
1441 if (setting_acl) {
1442 /* If we only got an "everyone" perm, just use that. */
1443 if (got_other)
1444 pace->perms = pace_other->perms;
1445 else
1446 pace->perms = 0;
1447 apply_default_perms(params, is_directory, pace, S_IRGRP);
1448 } else {
1449 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1450 }
1451
1452 DLIST_ADD(*pp_ace, pace);
1453 }
1454
1455 if (!got_other) {
1456 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1457 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1458 return False;
1459 }
1460
1461 ZERO_STRUCTP(pace);
1462 pace->type = SMB_ACL_OTHER;
1463 pace->owner_type = WORLD_ACE;
1464 pace->unix_ug.world = -1;
1465 pace->trustee = global_sid_World;
1466 pace->attr = ALLOW_ACE;
1467 if (setting_acl) {
1468 pace->perms = 0;
1469 apply_default_perms(params, is_directory, pace, S_IROTH);
1470 } else
1471 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1472
1473 DLIST_ADD(*pp_ace, pace);
1474 }
1475
1476 return True;
1477 }
1478
1479 /****************************************************************************
1480 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1481 If it does not have them, check if there are any entries where the trustee is the
1482 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1483 ****************************************************************************/
1484
1485 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1486 {
1487 bool got_user_obj, got_group_obj;
1488 canon_ace *current_ace;
1489 int i, entries;
1490
1491 entries = count_canon_ace_list(ace);
1492 got_user_obj = False;
1493 got_group_obj = False;
1494
1495 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1496 if (current_ace->type == SMB_ACL_USER_OBJ)
1497 got_user_obj = True;
1498 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1499 got_group_obj = True;
1500 }
1501 if (got_user_obj && got_group_obj) {
1502 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1503 return;
1504 }
1505
1506 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1507 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1508 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1509 current_ace->type = SMB_ACL_USER_OBJ;
1510 got_user_obj = True;
1511 }
1512 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1513 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1514 current_ace->type = SMB_ACL_GROUP_OBJ;
1515 got_group_obj = True;
1516 }
1517 }
1518 if (!got_user_obj)
1519 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1520 if (!got_group_obj)
1521 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1522 }
1523
1524 /****************************************************************************
1525 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1526 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1527 ****************************************************************************/
1528
1529 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1530 {
1531 /* dir ace must be followings.
1532 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1533 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1534 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1535 Posix ACL u:trustee:perm
1536
1537 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1538 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1539 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1540 Posix ACL g:trustee:perm
1541 */
1542
1543 if (ace->type == SMB_ACL_USER_OBJ &&
1544 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1545 canon_ace *dup_ace = dup_canon_ace(ace);
1546
1547 if (dup_ace == NULL) {
1548 return false;
1549 }
1550 dup_ace->type = SMB_ACL_USER;
1551 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1552 }
1553
1554 if (ace->type == SMB_ACL_GROUP_OBJ &&
1555 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1556 canon_ace *dup_ace = dup_canon_ace(ace);
1557
1558 if (dup_ace == NULL) {
1559 return false;
1560 }
1561 dup_ace->type = SMB_ACL_GROUP;
1562 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1563 }
1564
1565 return true;
1566 }
1567
1568 /****************************************************************************
1569 Unpack a SEC_DESC into two canonical ace lists.
1570 ****************************************************************************/
1571
1572 static bool create_canon_ace_lists(files_struct *fsp,
1573 SMB_STRUCT_STAT *pst,
1574 DOM_SID *pfile_owner_sid,
1575 DOM_SID *pfile_grp_sid,
1576 canon_ace **ppfile_ace,
1577 canon_ace **ppdir_ace,
1578 const SEC_ACL *dacl)
1579 {
1580 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1581 canon_ace *file_ace = NULL;
1582 canon_ace *dir_ace = NULL;
1583 canon_ace *current_ace = NULL;
1584 bool got_dir_allow = False;
1585 bool got_file_allow = False;
1586 int i, j;
1587
1588 *ppfile_ace = NULL;
1589 *ppdir_ace = NULL;
1590
1591 /*
1592 * Convert the incoming ACL into a more regular form.
1593 */
1594
1595 for(i = 0; i < dacl->num_aces; i++) {
1596 SEC_ACE *psa = &dacl->aces[i];
1597
1598 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1599 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1600 return False;
1601 }
1602
1603 if (nt4_compatible_acls()) {
1604 /*
1605 * The security mask may be UNIX_ACCESS_NONE which should map into
1606 * no permissions (we overload the WRITE_OWNER bit for this) or it
1607 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1608 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1609 */
1610
1611 /*
1612 * Convert GENERIC bits to specific bits.
1613 */
1614
1615 se_map_generic(&psa->access_mask, &file_generic_mapping);
1616
1617 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1618
1619 if(psa->access_mask != UNIX_ACCESS_NONE)
1620 psa->access_mask &= ~UNIX_ACCESS_NONE;
1621 }
1622 }
1623
1624 /*
1625 * Deal with the fact that NT 4.x re-writes the canonical format
1626 * that we return for default ACLs. If a directory ACE is identical
1627 * to a inherited directory ACE then NT changes the bits so that the
1628 * first ACE is set to OI|IO and the second ACE for this SID is set
1629 * to CI. We need to repair this. JRA.
1630 */
1631
1632 for(i = 0; i < dacl->num_aces; i++) {
1633 SEC_ACE *psa1 = &dacl->aces[i];
1634
1635 for (j = i + 1; j < dacl->num_aces; j++) {
1636 SEC_ACE *psa2 = &dacl->aces[j];
1637
1638 if (psa1->access_mask != psa2->access_mask)
1639 continue;
1640
1641 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1642 continue;
1643
1644 /*
1645 * Ok - permission bits and SIDs are equal.
1646 * Check if flags were re-written.
1647 */
1648
1649 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1650
1651 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1652 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1653
1654 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1655
1656 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1657 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1658
1659 }
1660 }
1661 }
1662
1663 for(i = 0; i < dacl->num_aces; i++) {
1664 SEC_ACE *psa = &dacl->aces[i];
1665
1666 /*
1667 * Create a cannon_ace entry representing this NT DACL ACE.
1668 */
1669
1670 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1671 free_canon_ace_list(file_ace);
1672 free_canon_ace_list(dir_ace);
1673 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1674 return False;
1675 }
1676
1677 ZERO_STRUCTP(current_ace);
1678
1679 sid_copy(&current_ace->trustee, &psa->trustee);
1680
1681 /*
1682 * Try and work out if the SID is a user or group
1683 * as we need to flag these differently for POSIX.
1684 * Note what kind of a POSIX ACL this should map to.
1685 */
1686
1687 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1688 current_ace->owner_type = WORLD_ACE;
1689 current_ace->unix_ug.world = -1;
1690 current_ace->type = SMB_ACL_OTHER;
1691 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1692 current_ace->owner_type = UID_ACE;
1693 current_ace->unix_ug.uid = pst->st_ex_uid;
1694 current_ace->type = SMB_ACL_USER_OBJ;
1695
1696 /*
1697 * The Creator Owner entry only specifies inheritable permissions,
1698 * never access permissions. WinNT doesn't always set the ACE to
1699 * INHERIT_ONLY, though.
1700 */
1701
1702 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1703
1704 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1705 current_ace->owner_type = GID_ACE;
1706 current_ace->unix_ug.gid = pst->st_ex_gid;
1707 current_ace->type = SMB_ACL_GROUP_OBJ;
1708
1709 /*
1710 * The Creator Group entry only specifies inheritable permissions,
1711 * never access permissions. WinNT doesn't always set the ACE to
1712 * INHERIT_ONLY, though.
1713 */
1714 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1715
1716 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1717 current_ace->owner_type = UID_ACE;
1718 /* If it's the owning user, this is a user_obj, not
1719 * a user. */
1720 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1721 current_ace->type = SMB_ACL_USER_OBJ;
1722 } else {
1723 current_ace->type = SMB_ACL_USER;
1724 }
1725 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1726 current_ace->owner_type = GID_ACE;
1727 /* If it's the primary group, this is a group_obj, not
1728 * a group. */
1729 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1730 current_ace->type = SMB_ACL_GROUP_OBJ;
1731 } else {
1732 current_ace->type = SMB_ACL_GROUP;
1733 }
1734 } else {
1735 /*
1736 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1737 */
1738
1739 if (non_mappable_sid(&psa->trustee)) {
1740 DEBUG(10, ("create_canon_ace_lists: ignoring "
1741 "non-mappable SID %s\n",
1742 sid_string_dbg(&psa->trustee)));
1743 SAFE_FREE(current_ace);
1744 continue;
1745 }
1746
1747 free_canon_ace_list(file_ace);
1748 free_canon_ace_list(dir_ace);
1749 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1750 "%s to uid or gid.\n",
1751 sid_string_dbg(&current_ace->trustee)));
1752 SAFE_FREE(current_ace);
1753 return False;
1754 }
1755
1756 /*
1757 * Map the given NT permissions into a UNIX mode_t containing only
1758 * S_I(R|W|X)USR bits.
1759 */
1760
1761 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1762 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1763
1764 /* Store the ace_flag. */
1765 current_ace->ace_flags = psa->flags;
1766
1767 /*
1768 * Now add the created ace to either the file list, the directory
1769 * list, or both. We *MUST* preserve the order here (hence we use
1770 * DLIST_ADD_END) as NT ACLs are order dependent.
1771 */
1772
1773 if (fsp->is_directory) {
1774
1775 /*
1776 * We can only add to the default POSIX ACE list if the ACE is
1777 * designed to be inherited by both files and directories.
1778 */
1779
1780 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1781 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1782
1783 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1784
1785 /*
1786 * Note if this was an allow ace. We can't process
1787 * any further deny ace's after this.
1788 */
1789
1790 if (current_ace->attr == ALLOW_ACE)
1791 got_dir_allow = True;
1792
1793 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1794 DEBUG(0,("create_canon_ace_lists: "
1795 "malformed ACL in "
1796 "inheritable ACL! Deny entry "
1797 "after Allow entry. Failing "
1798 "to set on file %s.\n",
1799 fsp_str_dbg(fsp)));
1800 free_canon_ace_list(file_ace);
1801 free_canon_ace_list(dir_ace);
1802 return False;
1803 }
1804
1805 if( DEBUGLVL( 10 )) {
1806 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1807 print_canon_ace( current_ace, 0);
1808 }
1809
1810 /*
1811 * We have a lossy mapping: directory ACE entries
1812 * CREATOR_OWNER ------\
1813 * (map to) +---> SMB_ACL_USER_OBJ
1814 * owning sid ------/
1815 *
1816 * CREATOR_GROUP ------\
1817 * (map to) +---> SMB_ACL_GROUP_OBJ
1818 * primary group sid --/
1819 *
1820 * on set. And on read of a directory ACL
1821 *
1822 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1823 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1824 *
1825 * Deal with this on set by duplicating
1826 * owning sid and primary group sid ACE
1827 * entries into the directory ACL.
1828 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1829 */
1830
1831 if (!dup_owning_ace(dir_ace, current_ace)) {
1832 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1833 free_canon_ace_list(file_ace);
1834 free_canon_ace_list(dir_ace);
1835 return false;
1836 }
1837
1838 /*
1839 * If this is not an inherit only ACE we need to add a duplicate
1840 * to the file acl.
1841 */
1842
1843 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1844 canon_ace *dup_ace = dup_canon_ace(current_ace);
1845
1846 if (!dup_ace) {
1847 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1848 free_canon_ace_list(file_ace);
1849 free_canon_ace_list(dir_ace);
1850 return False;
1851 }
1852
1853 /*
1854 * We must not free current_ace here as its
1855 * pointer is now owned by the dir_ace list.
1856 */
1857 current_ace = dup_ace;
1858 /* We've essentially split this ace into two,
1859 * and added the ace with inheritance request
1860 * bits to the directory ACL. Drop those bits for
1861 * the ACE we're adding to the file list. */
1862 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1863 SEC_ACE_FLAG_CONTAINER_INHERIT|
1864 SEC_ACE_FLAG_INHERIT_ONLY);
1865 } else {
1866 /*
1867 * We must not free current_ace here as its
1868 * pointer is now owned by the dir_ace list.
1869 */
1870 current_ace = NULL;
1871 }
1872 }
1873 }
1874
1875 /*
1876 * Only add to the file ACL if not inherit only.
1877 */
1878
1879 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1880 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1881
1882 /*
1883 * Note if this was an allow ace. We can't process
1884 * any further deny ace's after this.
1885 */
1886
1887 if (current_ace->attr == ALLOW_ACE)
1888 got_file_allow = True;
1889
1890 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1891 DEBUG(0,("create_canon_ace_lists: malformed "
1892 "ACL in file ACL ! Deny entry after "
1893 "Allow entry. Failing to set on file "
1894 "%s.\n", fsp_str_dbg(fsp)));
1895 free_canon_ace_list(file_ace);
1896 free_canon_ace_list(dir_ace);
1897 return False;
1898 }
1899
1900 if( DEBUGLVL( 10 )) {
1901 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1902 print_canon_ace( current_ace, 0);
1903 }
1904 all_aces_are_inherit_only = False;
1905 /*
1906 * We must not free current_ace here as its
1907 * pointer is now owned by the file_ace list.
1908 */
1909 current_ace = NULL;
1910 }
1911
1912 /*
1913 * Free if ACE was not added.
1914 */
1915
1916 SAFE_FREE(current_ace);
1917 }
1918
1919 if (fsp->is_directory && all_aces_are_inherit_only) {
1920 /*
1921 * Windows 2000 is doing one of these weird 'inherit acl'
1922 * traverses to conserve NTFS ACL resources. Just pretend
1923 * there was no DACL sent. JRA.
1924 */
1925
1926 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1927 free_canon_ace_list(file_ace);
1928 free_canon_ace_list(dir_ace);
1929 file_ace = NULL;
1930 dir_ace = NULL;
1931 } else {
1932 /*
1933 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1934 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1935 * entries can be converted to *_OBJ. Usually we will already have these
1936 * entries in the Default ACL, and the Access ACL will not have them.
1937 */
1938 if (file_ace) {
1939 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1940 }
1941 if (dir_ace) {
1942 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1943 }
1944 }
1945
1946 *ppfile_ace = file_ace;
1947 *ppdir_ace = dir_ace;
1948
1949 return True;
1950 }
1951
1952 /****************************************************************************
1953 ASCII art time again... JRA :-).
1954
1955 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1956 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1957 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1958 allow or deny have been merged, so the same SID can only appear once in the deny
1959 list or once in the allow list.
1960
1961 We then process as follows :
1962
1963 ---------------------------------------------------------------------------
1964 First pass - look for a Everyone DENY entry.
1965
1966 If it is deny all (rwx) trunate the list at this point.
1967 Else, walk the list from this point and use the deny permissions of this
1968 entry as a mask on all following allow entries. Finally, delete
1969 the Everyone DENY entry (we have applied it to everything possible).
1970
1971 In addition, in this pass we remove any DENY entries that have
1972 no permissions (ie. they are a DENY nothing).
1973 ---------------------------------------------------------------------------
1974 Second pass - only deal with deny user entries.
1975
1976 DENY user1 (perms XXX)
1977
1978 new_perms = 0
1979 for all following allow group entries where user1 is in group
1980 new_perms |= group_perms;
1981
1982 user1 entry perms = new_perms & ~ XXX;
1983
1984 Convert the deny entry to an allow entry with the new perms and
1985 push to the end of the list. Note if the user was in no groups
1986 this maps to a specific allow nothing entry for this user.
1987
1988 The common case from the NT ACL choser (userX deny all) is
1989 optimised so we don't do the group lookup - we just map to
1990 an allow nothing entry.
1991
1992 What we're doing here is inferring the allow permissions the
1993 person setting the ACE on user1 wanted by looking at the allow
1994 permissions on the groups the user is currently in. This will
1995 be a snapshot, depending on group membership but is the best
1996 we can do and has the advantage of failing closed rather than
1997 open.
1998 ---------------------------------------------------------------------------
1999 Third pass - only deal with deny group entries.
2000
2001 DENY group1 (perms XXX)
2002
2003 for all following allow user entries where user is in group1
2004 user entry perms = user entry perms & ~ XXX;
2005
2006 If there is a group Everyone allow entry with permissions YYY,
2007 convert the group1 entry to an allow entry and modify its
2008 permissions to be :
2009
2010 new_perms = YYY & ~ XXX
2011
2012 and push to the end of the list.
2013
2014 If there is no group Everyone allow entry then convert the
2015 group1 entry to a allow nothing entry and push to the end of the list.
2016
2017 Note that the common case from the NT ACL choser (groupX deny all)
2018 cannot be optimised here as we need to modify user entries who are
2019 in the group to change them to a deny all also.
2020
2021 What we're doing here is modifying the allow permissions of
2022 user entries (which are more specific in POSIX ACLs) to mask
2023 out the explicit deny set on the group they are in. This will
2024 be a snapshot depending on current group membership but is the
2025 best we can do and has the advantage of failing closed rather
2026 than open.
2027 ---------------------------------------------------------------------------
2028 Fourth pass - cope with cumulative permissions.
2029
2030 for all allow user entries, if there exists an allow group entry with
2031 more permissive permissions, and the user is in that group, rewrite the
2032 allow user permissions to contain both sets of permissions.
2033
2034 Currently the code for this is #ifdef'ed out as these semantics make
2035 no sense to me. JRA.
2036 ---------------------------------------------------------------------------
2037
2038 Note we *MUST* do the deny user pass first as this will convert deny user
2039 entries into allow user entries which can then be processed by the deny
2040 group pass.
2041
2042 The above algorithm took a *lot* of thinking about - hence this
2043 explaination :-). JRA.
2044 ****************************************************************************/
2045
2046 /****************************************************************************
2047 Process a canon_ace list entries. This is very complex code. We need
2048 to go through and remove the "deny" permissions from any allow entry that matches
2049 the id of this entry. We have already refused any NT ACL that wasn't in correct
2050 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2051 we just remove it (to fail safe). We have already removed any duplicate ace
2052 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2053 allow entries.
2054 ****************************************************************************/
2055
2056 static void process_deny_list( canon_ace **pp_ace_list )
2057 {
2058 canon_ace *ace_list = *pp_ace_list;
2059 canon_ace *curr_ace = NULL;
2060 canon_ace *curr_ace_next = NULL;
2061
2062 /* Pass 1 above - look for an Everyone, deny entry. */
2063
2064 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2065 canon_ace *allow_ace_p;
2066
2067 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2068
2069 if (curr_ace->attr != DENY_ACE)
2070 continue;
2071
2072 if (curr_ace->perms == (mode_t)0) {
2073
2074 /* Deny nothing entry - delete. */
2075
2076 DLIST_REMOVE(ace_list, curr_ace);
2077 continue;
2078 }
2079
2080 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2081 continue;
2082
2083 /* JRATEST - assert. */
2084 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2085
2086 if (curr_ace->perms == ALL_ACE_PERMS) {
2087
2088 /*
2089 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2090 * list at this point including this entry.
2091 */
2092
2093 canon_ace *prev_entry = curr_ace->prev;
2094
2095 free_canon_ace_list( curr_ace );
2096 if (prev_entry)
2097 prev_entry->next = NULL;
2098 else {
2099 /* We deleted the entire list. */
2100 ace_list = NULL;
2101 }
2102 break;
2103 }
2104
2105 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2106
2107 /*
2108 * Only mask off allow entries.
2109 */
2110
2111 if (allow_ace_p->attr != ALLOW_ACE)
2112 continue;
2113
2114 allow_ace_p->perms &= ~curr_ace->perms;
2115 }
2116
2117 /*
2118 * Now it's been applied, remove it.
2119 */
2120
2121 DLIST_REMOVE(ace_list, curr_ace);
2122 }
2123
2124 /* Pass 2 above - deal with deny user entries. */
2125
2126 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2127 mode_t new_perms = (mode_t)0;
2128 canon_ace *allow_ace_p;
2129
2130 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132 if (curr_ace->attr != DENY_ACE)
2133 continue;
2134
2135 if (curr_ace->owner_type != UID_ACE)
2136 continue;
2137
2138 if (curr_ace->perms == ALL_ACE_PERMS) {
2139
2140 /*
2141 * Optimisation - this is a deny everything to this user.
2142 * Convert to an allow nothing and push to the end of the list.
2143 */
2144
2145 curr_ace->attr = ALLOW_ACE;
2146 curr_ace->perms = (mode_t)0;
2147 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2148 continue;
2149 }
2150
2151 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2152
2153 if (allow_ace_p->attr != ALLOW_ACE)
2154 continue;
2155
2156 /* We process GID_ACE and WORLD_ACE entries only. */
2157
2158 if (allow_ace_p->owner_type == UID_ACE)
2159 continue;
2160
2161 if (uid_entry_in_group( curr_ace, allow_ace_p))
2162 new_perms |= allow_ace_p->perms;
2163 }
2164
2165 /*
2166 * Convert to a allow entry, modify the perms and push to the end
2167 * of the list.
2168 */
2169
2170 curr_ace->attr = ALLOW_ACE;
2171 curr_ace->perms = (new_perms & ~curr_ace->perms);
2172 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2173 }
2174
2175 /* Pass 3 above - deal with deny group entries. */
2176
2177 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2178 canon_ace *allow_ace_p;
2179 canon_ace *allow_everyone_p = NULL;
2180
2181 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2182
2183 if (curr_ace->attr != DENY_ACE)
2184 continue;
2185
2186 if (curr_ace->owner_type != GID_ACE)
2187 continue;
2188
2189 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2190
2191 if (allow_ace_p->attr != ALLOW_ACE)
2192 continue;
2193
2194 /* Store a pointer to the Everyone allow, if it exists. */
2195 if (allow_ace_p->owner_type == WORLD_ACE)
2196 allow_everyone_p = allow_ace_p;
2197
2198 /* We process UID_ACE entries only. */
2199
2200 if (allow_ace_p->owner_type != UID_ACE)
2201 continue;
2202
2203 /* Mask off the deny group perms. */
2204
2205 if (uid_entry_in_group( allow_ace_p, curr_ace))
2206 allow_ace_p->perms &= ~curr_ace->perms;
2207 }
2208
2209 /*
2210 * Convert the deny to an allow with the correct perms and
2211 * push to the end of the list.
2212 */
2213
2214 curr_ace->attr = ALLOW_ACE;
2215 if (allow_everyone_p)
2216 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2217 else
2218 curr_ace->perms = (mode_t)0;
2219 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2220 }
2221
2222 /* Doing this fourth pass allows Windows semantics to be layered
2223 * on top of POSIX semantics. I'm not sure if this is desirable.
2224 * For example, in W2K ACLs there is no way to say, "Group X no
2225 * access, user Y full access" if user Y is a member of group X.
2226 * This seems completely broken semantics to me.... JRA.
2227 */
2228
2229 #if 0
2230 /* Pass 4 above - deal with allow entries. */
2231
2232 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2233 canon_ace *allow_ace_p;
2234
2235 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2236
2237 if (curr_ace->attr != ALLOW_ACE)
2238 continue;
2239
2240 if (curr_ace->owner_type != UID_ACE)
2241 continue;
2242
2243 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2244
2245 if (allow_ace_p->attr != ALLOW_ACE)
2246 continue;
2247
2248 /* We process GID_ACE entries only. */
2249
2250 if (allow_ace_p->owner_type != GID_ACE)
2251 continue;
2252
2253 /* OR in the group perms. */
2254
2255 if (uid_entry_in_group( curr_ace, allow_ace_p))
2256 curr_ace->perms |= allow_ace_p->perms;
2257 }
2258 }
2259 #endif
2260
2261 *pp_ace_list = ace_list;
2262 }
2263
2264 /****************************************************************************
2265 Create a default mode that will be used if a security descriptor entry has
2266 no user/group/world entries.
2267 ****************************************************************************/
2268
2269 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2270 {
2271 int snum = SNUM(fsp->conn);
2272 mode_t and_bits = (mode_t)0;
2273 mode_t or_bits = (mode_t)0;
2274 mode_t mode;
2275
2276 if (interitable_mode) {
2277 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2278 fsp->fsp_name, NULL);
2279 } else {
2280 mode = S_IRUSR;
2281 }
2282
2283 if (fsp->is_directory)
2284 mode |= (S_IWUSR|S_IXUSR);
2285
2286 /*
2287 * Now AND with the create mode/directory mode bits then OR with the
2288 * force create mode/force directory mode bits.
2289 */
2290
2291 if (fsp->is_directory) {
2292 and_bits = lp_dir_security_mask(snum);
2293 or_bits = lp_force_dir_security_mode(snum);
2294 } else {
2295 and_bits = lp_security_mask(snum);
2296 or_bits = lp_force_security_mode(snum);
2297 }
2298
2299 return ((mode & and_bits)|or_bits);
2300 }
2301
2302 /****************************************************************************
2303 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2304 succeeding.
2305 ****************************************************************************/
2306
2307 static bool unpack_canon_ace(files_struct *fsp,
2308 SMB_STRUCT_STAT *pst,
2309 DOM_SID *pfile_owner_sid,
2310 DOM_SID *pfile_grp_sid,
2311 canon_ace **ppfile_ace,
2312 canon_ace **ppdir_ace,
2313 uint32 security_info_sent,
2314 const SEC_DESC *psd)
2315 {
2316 canon_ace *file_ace = NULL;
2317 canon_ace *dir_ace = NULL;
2318
2319 *ppfile_ace = NULL;
2320 *ppdir_ace = NULL;
2321
2322 if(security_info_sent == 0) {
2323 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2324 return False;
2325 }
2326
2327 /*
2328 * If no DACL then this is a chown only security descriptor.
2329 */
2330
2331 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2332 return True;
2333
2334 /*
2335 * Now go through the DACL and create the canon_ace lists.
2336 */
2337
2338 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2339 &file_ace, &dir_ace, psd->dacl))
2340 return False;
2341
2342 if ((file_ace == NULL) && (dir_ace == NULL)) {
2343 /* W2K traverse DACL set - ignore. */
2344 return True;
2345 }
2346
2347 /*
2348 * Go through the canon_ace list and merge entries
2349 * belonging to identical users of identical allow or deny type.
2350 * We can do this as all deny entries come first, followed by
2351 * all allow entries (we have mandated this before accepting this acl).
2352 */
2353
2354 print_canon_ace_list( "file ace - before merge", file_ace);
2355 merge_aces( &file_ace, false);
2356
2357 print_canon_ace_list( "dir ace - before merge", dir_ace);
2358 merge_aces( &dir_ace, true);
2359
2360 /*
2361 * NT ACLs are order dependent. Go through the acl lists and
2362 * process DENY entries by masking the allow entries.
2363 */
2364
2365 print_canon_ace_list( "file ace - before deny", file_ace);
2366 process_deny_list( &file_ace);
2367
2368 print_canon_ace_list( "dir ace - before deny", dir_ace);
2369 process_deny_list( &dir_ace);
2370
2371 /*
2372 * A well formed POSIX file or default ACL has at least 3 entries, a
2373 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2374 * and optionally a mask entry. Ensure this is the case.
2375 */
2376
2377 print_canon_ace_list( "file ace - before valid", file_ace);
2378
2379 /*
2380 * A default 3 element mode entry for a file should be r-- --- ---.
2381 * A default 3 element mode entry for a directory should be rwx --- ---.
2382 */
2383
2384 pst->st_ex_mode = create_default_mode(fsp, False);
2385
2386 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2387 free_canon_ace_list(file_ace);
2388 free_canon_ace_list(dir_ace);
2389 return False;
2390 }
2391
2392 print_canon_ace_list( "dir ace - before valid", dir_ace);
2393
2394 /*
2395 * A default inheritable 3 element mode entry for a directory should be the
2396 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2397 * it's a directory.
2398 */
2399
2400 pst->st_ex_mode = create_default_mode(fsp, True);
2401
2402 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2403 free_canon_ace_list(file_ace);
2404 free_canon_ace_list(dir_ace);
2405 return False;
2406 }
2407
2408 print_canon_ace_list( "file ace - return", file_ace);
2409 print_canon_ace_list( "dir ace - return", dir_ace);
2410
2411 *ppfile_ace = file_ace;
2412 *ppdir_ace = dir_ace;
2413 return True;
2414
2415 }
2416
2417 /******************************************************************************
2418 When returning permissions, try and fit NT display
2419 semantics if possible. Note the the canon_entries here must have been malloced.
2420 The list format should be - first entry = owner, followed by group and other user
2421 entries, last entry = other.
2422
2423 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2424 are not ordered, and match on the most specific entry rather than walking a list,
2425 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2426
2427 Entry 0: owner : deny all except read and write.
2428 Entry 1: owner : allow read and write.
2429 Entry 2: group : deny all except read.
2430 Entry 3: group : allow read.
2431 Entry 4: Everyone : allow read.
2432
2433 But NT cannot display this in their ACL editor !
2434 ********************************************************************************/
2435
2436 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2437 {
2438 canon_ace *l_head = *pp_list_head;
2439 canon_ace *owner_ace = NULL;
2440 canon_ace *other_ace = NULL;
2441 canon_ace *ace = NULL;
2442
2443 for (ace = l_head; ace; ace = ace->next) {
2444 if (ace->type == SMB_ACL_USER_OBJ)
2445 owner_ace = ace;
2446 else if (ace->type == SMB_ACL_OTHER) {
2447 /* Last ace - this is "other" */
2448 other_ace = ace;
2449 }
2450 }
2451
2452 if (!owner_ace || !other_ace) {
2453 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2454 filename ));
2455 return;
2456 }
2457
2458 /*
2459 * The POSIX algorithm applies to owner first, and other last,
2460 * so ensure they are arranged in this order.
2461 */
2462
2463 if (owner_ace) {
2464 DLIST_PROMOTE(l_head, owner_ace);
2465 }
2466
2467 if (other_ace) {
2468 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2469 }
2470
2471 /* We have probably changed the head of the list. */
2472
2473 *pp_list_head = l_head;
2474 }
2475
2476 /****************************************************************************
2477 Create a linked list of canonical ACE entries.
2478 ****************************************************************************/
2479
2480 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2481 const char *fname, SMB_ACL_T posix_acl,
2482 const SMB_STRUCT_STAT *psbuf,
2483 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2484 {
2485 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2486 canon_ace *l_head = NULL;
2487 canon_ace *ace = NULL;
2488 canon_ace *next_ace = NULL;
2489 int entry_id = SMB_ACL_FIRST_ENTRY;
2490 SMB_ACL_ENTRY_T entry;
2491 size_t ace_count;
2492
2493 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2494 SMB_ACL_TAG_T tagtype;
2495 SMB_ACL_PERMSET_T permset;
2496 DOM_SID sid;
2497 posix_id unix_ug;
2498 enum ace_owner owner_type;
2499
2500 entry_id = SMB_ACL_NEXT_ENTRY;
2501
2502 /* Is this a MASK entry ? */
2503 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2504 continue;
2505
2506 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2507 continue;
2508
2509 /* Decide which SID to use based on the ACL type. */
2510 switch(tagtype) {
2511 case SMB_ACL_USER_OBJ:
2512 /* Get the SID from the owner. */
2513 sid_copy(&sid, powner);
2514 unix_ug.uid = psbuf->st_ex_uid;
2515 owner_type = UID_ACE;
2516 break;
2517 case SMB_ACL_USER:
2518 {
2519 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2520 if (puid == NULL) {
2521 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2522 continue;
2523 }
2524 uid_to_sid( &sid, *puid);
2525 unix_ug.uid = *puid;
2526 owner_type = UID_ACE;
2527 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2528 break;
2529 }
2530 case SMB_ACL_GROUP_OBJ:
2531 /* Get the SID from the owning group. */
2532 sid_copy(&sid, pgroup);
2533 unix_ug.gid = psbuf->st_ex_gid;
2534 owner_type = GID_ACE;
2535 break;
2536 case SMB_ACL_GROUP:
2537 {
2538 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2539 if (pgid == NULL) {
2540 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2541 continue;
2542 }
2543 gid_to_sid( &sid, *pgid);
2544 unix_ug.gid = *pgid;
2545 owner_type = GID_ACE;
2546 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2547 break;
2548 }
2549 case SMB_ACL_MASK:
2550 acl_mask = convert_permset_to_mode_t(conn, permset);
2551 continue; /* Don't count the mask as an entry. */
2552 case SMB_ACL_OTHER:
2553 /* Use the Everyone SID */
2554 sid = global_sid_World;
2555 unix_ug.world = -1;
2556 owner_type = WORLD_ACE;
2557 break;
2558 default:
2559 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2560 continue;
2561 }
2562
2563 /*
2564 * Add this entry to the list.
2565 */
2566
2567 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2568 goto fail;
2569
2570 ZERO_STRUCTP(ace);
2571 ace->type = tagtype;
2572 ace->perms = convert_permset_to_mode_t(conn, permset);
2573 ace->attr = ALLOW_ACE;
2574 ace->trustee = sid;
2575 ace->unix_ug = unix_ug;
2576 ace->owner_type = owner_type;
2577 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2578
2579 DLIST_ADD(l_head, ace);
2580 }
2581
2582 /*
2583 * This next call will ensure we have at least a user/group/world set.
2584 */
2585
2586 if (!ensure_canon_entry_valid(&l_head, conn->params,
2587 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2588 psbuf, False))
2589 goto fail;
2590
2591 /*
2592 * Now go through the list, masking the permissions with the
2593 * acl_mask. Ensure all DENY Entries are at the start of the list.
2594 */
2595
2596 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2597
2598 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2599 next_ace = ace->next;
2600
2601 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2602 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2603 ace->perms &= acl_mask;
2604
2605 if (ace->perms == 0) {
2606 DLIST_PROMOTE(l_head, ace);
2607 }
2608
2609 if( DEBUGLVL( 10 ) ) {
2610 print_canon_ace(ace, ace_count);
2611 }
2612 }
2613
2614 arrange_posix_perms(fname,&l_head );
2615
2616 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2617
2618 return l_head;
2619
2620 fail:
2621
2622 free_canon_ace_list(l_head);
2623 return NULL;
2624 }
2625
2626 /****************************************************************************
2627 Check if the current user group list contains a given group.
2628 ****************************************************************************/
2629
2630 static bool current_user_in_group(gid_t gid)
2631 {
2632 int i;
2633
2634 for (i = 0; i < current_user.ut.ngroups; i++) {
2635 if (current_user.ut.groups[i] == gid) {
2636 return True;
2637 }
2638 }
2639
2640 return False;
2641 }
2642
2643 /****************************************************************************
2644 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2645 ****************************************************************************/
2646
2647 static bool acl_group_override(connection_struct *conn,
2648 const struct smb_filename *smb_fname)
2649 {
2650 if ((errno != EPERM) && (errno != EACCES)) {
2651 return false;
2652 }
2653
2654 /* file primary group == user primary or supplementary group */
2655 if (lp_acl_group_control(SNUM(conn)) &&
2656 current_user_in_group(smb_fname->st.st_ex_gid)) {
2657 return true;
2658 }
2659
2660 /* user has writeable permission */
2661 if (lp_dos_filemode(SNUM(conn)) &&
2662 can_write_to_file(conn, smb_fname)) {
2663 return true;
2664 }
2665
2666 return false;
2667 }
2668
2669 /****************************************************************************
2670 Attempt to apply an ACL to a file or directory.
2671 ****************************************************************************/
2672
2673 static bool set_canon_ace_list(files_struct *fsp,
2674 canon_ace *the_ace,
2675 bool default_ace,
2676 const SMB_STRUCT_STAT *psbuf,
2677 bool *pacl_set_support)
2678 {
2679 connection_struct *conn = fsp->conn;
2680 bool ret = False;
2681 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2682 canon_ace *p_ace;
2683 int i;
2684 SMB_ACL_ENTRY_T mask_entry;
2685 bool got_mask_entry = False;
2686 SMB_ACL_PERMSET_T mask_permset;
2687 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2688 bool needs_mask = False;
2689 mode_t mask_perms = 0;
2690
2691 /* Use the psbuf that was passed in. */
2692 fsp->fsp_name->st = *psbuf;
2693
2694 #if defined(POSIX_ACL_NEEDS_MASK)
2695 /* HP-UX always wants to have a mask (called "class" there). */
2696 needs_mask = True;
2697 #endif
2698
2699 if (the_acl == NULL) {
2700
2701 if (!no_acl_syscall_error(errno)) {
2702 /*
2703 * Only print this error message if we have some kind of ACL
2704 * support that's not working. Otherwise we would always get this.
2705 */
2706 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2707 default_ace ? "default" : "file", strerror(errno) ));
2708 }
2709 *pacl_set_support = False;
2710 goto fail;
2711 }
2712
2713 if( DEBUGLVL( 10 )) {
2714 dbgtext("set_canon_ace_list: setting ACL:\n");
2715 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2716 print_canon_ace( p_ace, i);
2717 }
2718 }
2719
2720 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2721 SMB_ACL_ENTRY_T the_entry;
2722 SMB_ACL_PERMSET_T the_permset;
2723
2724 /*
2725 * ACLs only "need" an ACL_MASK entry if there are any named user or
2726 * named group entries. But if there is an ACL_MASK entry, it applies
2727 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2728 * so that it doesn't deny (i.e., mask off) any permissions.
2729 */
2730
2731 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2732 needs_mask = True;
2733 mask_perms |= p_ace->perms;
2734 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2735 mask_perms |= p_ace->perms;
2736 }
2737
2738 /*
2739 * Get the entry for this ACE.
2740 */
2741
2742 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2743 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2744 i, strerror(errno) ));
2745 goto fail;
2746 }
2747
2748 if (p_ace->type == SMB_ACL_MASK) {
2749 mask_entry = the_entry;
2750 got_mask_entry = True;
2751 }
2752
2753 /*
2754 * Ok - we now know the ACL calls should be working, don't
2755 * allow fallback to chmod.
2756 */
2757
2758 *pacl_set_support = True;
2759
2760 /*
2761 * Initialise the entry from the canon_ace.
2762 */
2763
2764 /*
2765 * First tell the entry what type of ACE this is.
2766 */
2767
2768 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2769 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2770 i, strerror(errno) ));
2771 goto fail;
2772 }
2773
2774 /*
2775 * Only set the qualifier (user or group id) if the entry is a user
2776 * or group id ACE.
2777 */
2778
2779 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2780 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2781 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2782 i, strerror(errno) ));
2783 goto fail;
2784 }
2785 }
2786
2787 /*
2788 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2789 */
2790
2791 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2792 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2793 i, strerror(errno) ));
2794 goto fail;
2795 }
2796
2797 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2798 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2799 (unsigned int)p_ace->perms, i, strerror(errno) ));
2800 goto fail;
2801 }
2802
2803 /*
2804 * ..and apply them to the entry.
2805 */
2806
2807 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2808 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2809 i, strerror(errno) ));
2810 goto fail;
2811 }
2812
2813 if( DEBUGLVL( 10 ))
2814 print_canon_ace( p_ace, i);
2815
2816 }
2817
2818 if (needs_mask && !got_mask_entry) {
2819 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2820 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2821 goto fail;
2822 }
2823
2824 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2825 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2826 goto fail;
2827 }
2828
2829 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2830 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2831 goto fail;
2832 }
2833
2834 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2835 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2836 goto fail;
2837 }
2838
2839 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2840 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2841 goto fail;
2842 }
2843 }
2844
2845 /*
2846 * Finally apply it to the file or directory.
2847 */
2848
2849 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2850 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2851 the_acl_type, the_acl) == -1) {
2852 /*
2853 * Some systems allow all the above calls and only fail with no ACL support
2854 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2855 */
2856 if (no_acl_syscall_error(errno)) {
2857 *pacl_set_support = False;
2858 }
2859
2860 if (acl_group_override(conn, fsp->fsp_name)) {
2861 int sret;
2862
2863 DEBUG(5,("set_canon_ace_list: acl group "
2864 "control on and current user in file "
2865 "%s primary group.\n",
2866 fsp_str_dbg(fsp)));
2867
2868 become_root();
2869 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2870 fsp->fsp_name->base_name, the_acl_type,
2871 the_acl);
2872 unbecome_root();
2873 if (sret == 0) {
2874 ret = True;
2875 }
2876 }
2877
2878 if (ret == False) {
2879 DEBUG(2,("set_canon_ace_list: "
2880 "sys_acl_set_file type %s failed for "
2881 "file %s (%s).\n",
2882 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2883 "directory default" : "file",
2884 fsp_str_dbg(fsp), strerror(errno)));
2885 goto fail;
2886 }
2887 }
2888 } else {
2889 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2890 /*
2891 * Some systems allow all the above calls and only fail with no ACL support
2892 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2893 */
2894 if (no_acl_syscall_error(errno)) {
2895 *pacl_set_support = False;
2896 }
2897
2898 if (acl_group_override(conn, fsp->fsp_name)) {
2899 int sret;
2900
2901 DEBUG(5,("set_canon_ace_list: acl group "
2902 "control on and current user in file "
2903 "%s primary group.\n",
2904 fsp_str_dbg(fsp)));
2905
2906 become_root();
2907 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2908 unbecome_root();
2909 if (sret == 0) {
2910 ret = True;
2911 }
2912 }
2913
2914 if (ret == False) {
2915 DEBUG(2,("set_canon_ace_list: "
2916 "sys_acl_set_file failed for file %s "
2917 "(%s).\n",
2918 fsp_str_dbg(fsp), strerror(errno)));
2919 goto fail;
2920 }
2921 }
2922 }
2923
2924 ret = True;
2925
2926 fail:
2927
2928 if (the_acl != NULL) {
2929 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2930 }
2931
2932 return ret;
2933 }
2934
2935 /****************************************************************************
2936 Find a particular canon_ace entry.
2937 ****************************************************************************/
2938
2939 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2940 {
2941 while (list) {
2942 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2943 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2944 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2945 break;
2946 list = list->next;
2947 }
2948 return list;
2949 }
2950
2951 /****************************************************************************
2952
2953 ****************************************************************************/
2954
2955 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2956 {
2957 SMB_ACL_ENTRY_T entry;
2958
2959 if (!the_acl)
2960 return NULL;
2961 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2962 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2963 return NULL;
2964 }
2965 return the_acl;
2966 }
2967
2968 /****************************************************************************
2969 Convert a canon_ace to a generic 3 element permission - if possible.
2970 ****************************************************************************/
2971
2972 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2973
2974 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2975 {
2976 int snum = SNUM(fsp->conn);
2977 size_t ace_count = count_canon_ace_list(file_ace_list);
2978 canon_ace *ace_p;
2979 canon_ace *owner_ace = NULL;
2980 canon_ace *group_ace = NULL;
2981 canon_ace *other_ace = NULL;
2982 mode_t and_bits;
2983 mode_t or_bits;
2984
2985 if (ace_count != 3) {
2986 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2987 "entries for file %s to convert to posix perms.\n",
2988 fsp_str_dbg(fsp)));
2989 return False;
2990 }
2991
2992 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2993 if (ace_p->owner_type == UID_ACE)
2994 owner_ace = ace_p;
2995 else if (ace_p->owner_type == GID_ACE)
2996 group_ace = ace_p;
2997 else if (ace_p->owner_type == WORLD_ACE)
2998 other_ace = ace_p;
2999 }
3000
3001 if (!owner_ace || !group_ace || !other_ace) {
3002 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3003 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3004 return False;
3005 }
3006
3007 *posix_perms = (mode_t)0;
3008
3009 *posix_perms |= owner_ace->perms;
3010 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3011 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3012 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3013 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3014 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3015 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3016
3017 /* The owner must have at least read access. */
3018
3019 *posix_perms |= S_IRUSR;
3020 if (fsp->is_directory)
3021 *posix_perms |= (S_IWUSR|S_IXUSR);
3022
3023 /* If requested apply the masks. */
3024
3025 /* Get the initial bits to apply. */
3026
3027 if (fsp->is_directory) {
3028 and_bits = lp_dir_security_mask(snum);
3029 or_bits = lp_force_dir_security_mode(snum);
3030 } else {
3031 and_bits = lp_security_mask(snum);
3032 or_bits = lp_force_security_mode(snum);
3033 }
3034
3035 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3036
3037 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3038 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3039 (int)group_ace->perms, (int)other_ace->perms,
3040 (int)*posix_perms, fsp_str_dbg(fsp)));
3041
3042 return True;
3043 }
3044
3045 /****************************************************************************
3046 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3047 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3048 with CI|OI set so it is inherited and also applies to the directory.
3049 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3050 ****************************************************************************/
3051
3052 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3053 {
3054 size_t i, j;
3055
3056 for (i = 0; i < num_aces; i++) {
3057 for (j = i+1; j < num_aces; j++) {
3058 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3059 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3060 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3061 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3062
3063 /* We know the lower number ACE's are file entries. */
3064 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3065 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3066 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3067 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3068 (i_inh == j_inh) &&
3069 (i_flags_ni == 0) &&
3070 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3071 SEC_ACE_FLAG_CONTAINER_INHERIT|
3072 SEC_ACE_FLAG_INHERIT_ONLY))) {
3073 /*
3074 * W2K wants to have access allowed zero access ACE's
3075 * at the end of the list. If the mask is zero, merge
3076 * the non-inherited ACE onto the inherited ACE.
3077 */
3078
3079 if (nt_ace_list[i].access_mask == 0) {
3080 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3081 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3082 if (num_aces - i - 1 > 0)
3083 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3084 sizeof(SEC_ACE));
3085
3086 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3087 (unsigned int)i, (unsigned int)j ));
3088 } else {
3089 /*
3090 * These are identical except for the flags.
3091 * Merge the inherited ACE onto the non-inherited ACE.
3092 */
3093
3094 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3095 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3096 if (num_aces - j - 1 > 0)
3097 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3098 sizeof(SEC_ACE));
3099
3100 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3101 (unsigned int)j, (unsigned int)i ));
3102 }
3103 num_aces--;
3104 break;
3105 }
3106 }
3107 }
3108
3109 return num_aces;
3110 }
3111
3112 /*
3113 * Add or Replace ACE entry.
3114 * In some cases we need to add a specific ACE for compatibility reasons.
3115 * When doing that we must make sure we are not actually creating a duplicate
3116 * entry. So we need to search whether an ACE entry already exist and eventually
3117 * replacce the access mask, or add a completely new entry if none was found.
3118 *
3119 * This function assumes the array has enough space to add a new entry without
3120 * any reallocation of memory.
3121 */
3122
3123 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3124 const DOM_SID *sid, enum security_ace_type type,
3125 uint32_t mask, uint8_t flags)
3126 {
3127 int i;
3128
3129 /* first search for a duplicate */
3130 for (i = 0; i < *num_aces; i++) {
3131 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3132 (nt_ace_list[i].flags == flags)) break;
3133 }
3134
3135 if (i < *num_aces) { /* found */
3136 nt_ace_list[i].type = type;
3137 nt_ace_list[i].access_mask = mask;
3138 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3139 i, sid_string_dbg(sid), flags));
3140 return;
3141 }
3142
3143 /* not found, append it */
3144 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3145 }
3146
3147
3148 /****************************************************************************
3149 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3150 the space for the return elements and returns the size needed to return the
3151 security descriptor. This should be the only external function needed for
3152 the UNIX style get ACL.
3153 ****************************************************************************/
3154
3155 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3156 const char *name,
3157 const SMB_STRUCT_STAT *sbuf,
3158 struct pai_val *pal,
3159 SMB_ACL_T posix_acl,
3160 SMB_ACL_T def_acl,
3161 uint32_t security_info,
3162 SEC_DESC **ppdesc)
3163 {
3164 DOM_SID owner_sid;
3165 DOM_SID group_sid;
3166 size_t sd_size = 0;
3167 SEC_ACL *psa = NULL;
3168 size_t num_acls = 0;
3169 size_t num_def_acls = 0;
3170 size_t num_aces = 0;
3171 canon_ace *file_ace = NULL;
3172 canon_ace *dir_ace = NULL;
3173 SEC_ACE *nt_ace_list = NULL;
3174 size_t num_profile_acls = 0;
3175 DOM_SID orig_owner_sid;
3176 SEC_DESC *psd = NULL;
3177 int i;
3178
3179 /*
3180 * Get the owner, group and world SIDs.
3181 */
3182
3183 create_file_sids(sbuf, &owner_sid, &group_sid);
3184
3185 if (lp_profile_acls(SNUM(conn))) {
3186 /* For WXP SP1 the owner must be administrators. */
3187 sid_copy(&orig_owner_sid, &owner_sid);
3188 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3189 sid_copy(&group_sid, &global_sid_Builtin_Users);
3190 num_profile_acls = 3;
3191 }
3192
3193 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3194
3195 /*
3196 * In the optimum case Creator Owner and Creator Group would be used for
3197 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3198 * would lead to usability problems under Windows: The Creator entries
3199 * are only available in browse lists of directories and not for files;
3200 * additionally the identity of the owning group couldn't be determined.
3201 * We therefore use those identities only for Default ACLs.
3202 */
3203
3204 /* Create the canon_ace lists. */
3205 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3206 &owner_sid, &group_sid, pal,
3207 SMB_ACL_TYPE_ACCESS);
3208
3209 /* We must have *some* ACLS. */
3210
3211 if (count_canon_ace_list(file_ace) == 0) {
3212 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3213 goto done;
3214 }
3215
3216 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3217 dir_ace = canonicalise_acl(conn, name, def_acl,
3218 sbuf,
3219 &global_sid_Creator_Owner,
3220 &global_sid_Creator_Group,
3221 pal, SMB_ACL_TYPE_DEFAULT);
3222 }
3223
3224 /*
3225 * Create the NT ACE list from the canonical ace lists.
3226 */
3227
3228 {
3229 canon_ace *ace;
3230 enum security_ace_type nt_acl_type;
3231
3232 if (nt4_compatible_acls() && dir_ace) {
3233 /*
3234 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3235 * but no non-INHERIT_ONLY entry for one SID. So we only
3236 * remove entries from the Access ACL if the
3237 * corresponding Default ACL entries have also been
3238 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3239 * are exceptions. We can do nothing
3240 * intelligent if the Default ACL contains entries that
3241 * are not also contained in the Access ACL, so this
3242 * case will still fail under NT 4.
3243 */
3244
3245 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3246 if (ace && !ace->perms) {
3247 DLIST_REMOVE(dir_ace, ace);
3248 SAFE_FREE(ace);
3249
3250 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3251 if (ace && !ace->perms) {
3252 DLIST_REMOVE(file_ace, ace);
3253 SAFE_FREE(ace);
3254 }
3255 }
3256
3257 /*
3258 * WinNT doesn't usually have Creator Group
3259 * in browse lists, so we send this entry to
3260 * WinNT even if it contains no relevant
3261 * permissions. Once we can add
3262 * Creator Group to browse lists we can
3263 * re-enable this.
3264 */
3265
3266 #if 0
3267 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3268 if (ace && !ace->perms) {
3269 DLIST_REMOVE(dir_ace, ace);
3270 SAFE_FREE(ace);
3271 }
3272 #endif
3273
3274 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3275 if (ace && !ace->perms) {
3276 DLIST_REMOVE(file_ace, ace);
3277 SAFE_FREE(ace);
3278 }
3279 }
3280
3281 num_acls = count_canon_ace_list(file_ace);
3282 num_def_acls = count_canon_ace_list(dir_ace);
3283
3284 /* Allocate the ace list. */
3285 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3286 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3287 goto done;
3288 }
3289
3290 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3291
3292 /*
3293 * Create the NT ACE list from the canonical ace lists.
3294 */
3295
3296 for (ace = file_ace; ace != NULL; ace = ace->next) {
3297 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3298 &nt_acl_type,
3299 ace->perms,
3300 S_ISDIR(sbuf->st_ex_mode));
3301 init_sec_ace(&nt_ace_list[num_aces++],
3302 &ace->trustee,
3303 nt_acl_type,
3304 acc,
3305 ace->ace_flags);
3306 }
3307
3308 /* The User must have access to a profile share - even
3309 * if we can't map the SID. */
3310 if (lp_profile_acls(SNUM(conn))) {
3311 add_or_replace_ace(nt_ace_list, &num_aces,
3312 &global_sid_Builtin_Users,
3313 SEC_ACE_TYPE_ACCESS_ALLOWED,
3314 FILE_GENERIC_ALL, 0);
3315 }
3316
3317 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3318 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3319 &nt_acl_type,
3320 ace->perms,
3321 S_ISDIR(sbuf->st_ex_mode));
3322 init_sec_ace(&nt_ace_list[num_aces++],
3323 &ace->trustee,
3324 nt_acl_type,
3325 acc,
3326 ace->ace_flags |
3327 SEC_ACE_FLAG_OBJECT_INHERIT|
3328 SEC_ACE_FLAG_CONTAINER_INHERIT|
3329 SEC_ACE_FLAG_INHERIT_ONLY);
3330 }
3331
3332 /* The User must have access to a profile share - even
3333 * if we can't map the SID. */
3334 if (lp_profile_acls(SNUM(conn))) {
3335 add_or_replace_ace(nt_ace_list, &num_aces,
3336 &global_sid_Builtin_Users,
3337 SEC_ACE_TYPE_ACCESS_ALLOWED,
3338 FILE_GENERIC_ALL,
3339 SEC_ACE_FLAG_OBJECT_INHERIT |
3340 SEC_ACE_FLAG_CONTAINER_INHERIT |
3341 SEC_ACE_FLAG_INHERIT_ONLY);
3342 }
3343
3344 /*
3345 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3346 * Win2K needs this to get the inheritance correct when replacing ACLs
3347 * on a directory tree. Based on work by Jim @ IBM.
3348 */
3349
3350 num_aces = merge_default_aces(nt_ace_list, num_aces);
3351
3352 if (lp_profile_acls(SNUM(conn))) {
3353 for (i = 0; i < num_aces; i++) {
3354 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3355 add_or_replace_ace(nt_ace_list, &num_aces,
3356 &orig_owner_sid,
3357 nt_ace_list[i].type,
3358 nt_ace_list[i].access_mask,
3359 nt_ace_list[i].flags);
3360 break;
3361 }
3362 }
3363 }
3364 }
3365
3366 if (num_aces) {
3367 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3368 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3369 goto done;
3370 }
3371 }
3372 } /* security_info & DACL_SECURITY_INFORMATION */
3373
3374 psd = make_standard_sec_desc( talloc_tos(),
3375 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3376 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3377 psa,
3378 &sd_size);
3379
3380 if(!psd) {
3381 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3382 sd_size = 0;
3383 goto done;
3384 }
3385
3386 /*
3387 * Windows 2000: The DACL_PROTECTED flag in the security
3388 * descriptor marks the ACL as non-inheriting, i.e., no
3389 * ACEs from higher level directories propagate to this
3390 * ACL. In the POSIX ACL model permissions are only
3391 * inherited at file create time, so ACLs never contain
3392 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3393 * flag doesn't seem to bother Windows NT.
3394 * Always set this if map acl inherit is turned off.
3395 */
3396 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3397 psd->type |= SEC_DESC_DACL_PROTECTED;
3398 } else {
3399 psd->type |= pal->sd_type;
3400 }
3401
3402 if (psd->dacl) {
3403 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3404 }
3405
3406 *ppdesc = psd;
3407
3408 done:
3409
3410 if (posix_acl) {
3411 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3412 }
3413 if (def_acl) {
3414 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3415 }
3416 free_canon_ace_list(file_ace);
3417 free_canon_ace_list(dir_ace);
3418 free_inherited_info(pal);
3419 SAFE_FREE(nt_ace_list);
3420
3421 return NT_STATUS_OK;
3422 }
3423
3424 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3425 SEC_DESC **ppdesc)
3426 {
3427 SMB_STRUCT_STAT sbuf;
3428 SMB_ACL_T posix_acl = NULL;
3429 struct pai_val *pal;
3430
3431 *ppdesc = NULL;
3432
3433 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3434 fsp_str_dbg(fsp)));
3435
3436 /* can it happen that fsp_name == NULL ? */
3437 if (fsp->is_directory || fsp->fh->fd == -1) {
3438 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3439 security_info, ppdesc);
3440 }
3441
3442 /* Get the stat struct for the owner info. */
3443 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3444 return map_nt_error_from_unix(errno);
3445 }
3446
3447 /* Get the ACL from the fd. */
3448 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3449
3450 pal = fload_inherited_info(fsp);
3451
3452 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3453 &sbuf, pal, posix_acl, NULL,
3454 security_info, ppdesc);
3455 }
3456
3457 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3458 uint32_t security_info, SEC_DESC **ppdesc)
3459 {
3460 SMB_ACL_T posix_acl = NULL;
3461 SMB_ACL_T def_acl = NULL;
3462 struct pai_val *pal;
3463 struct smb_filename smb_fname;
3464 int ret;
3465
3466 *ppdesc = NULL;
3467
3468 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3469
3470 ZERO_STRUCT(smb_fname);
3471 smb_fname.base_name = discard_const_p(char, name);
3472
3473 /* Get the stat struct for the owner info. */
3474 if (lp_posix_pathnames()) {
3475 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3476 } else {
3477 ret = SMB_VFS_STAT(conn, &smb_fname);
3478 }
3479
3480 if (ret == -1) {
3481 return map_nt_error_from_unix(errno);
3482 }
3483
3484 /* Get the ACL from the path. */
3485 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3486
3487 /* If it's a directory get the default POSIX ACL. */
3488 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3489 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3490 def_acl = free_empty_sys_acl(conn, def_acl);
3491 }
3492
3493 pal = load_inherited_info(conn, name);
3494
3495 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3496 posix_acl, def_acl, security_info,
3497 ppdesc);
3498 }
3499
3500 /****************************************************************************
3501 Try to chown a file. We will be able to chown it under the following conditions.
3502
3503 1) If we have root privileges, then it will just work.
3504 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3505 3) If we have SeRestorePrivilege we can change the user to any other user.
3506 4) If we have write permission to the file and dos_filemodes is set
3507 then allow chown to the currently authenticated user.
3508 ****************************************************************************/
3509
3510 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3511 uid_t uid, gid_t gid)
3512 {
3513 int ret;
3514 files_struct *fsp;
3515
3516 if(!CAN_WRITE(conn)) {
3517 return -1;
3518 }
3519
3520 /* Case (1). */
3521 /* try the direct way first */
3522 if (lp_posix_pathnames()) {
3523 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3524 } else {
3525 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3526 }
3527
3528 if (ret == 0)
3529 return 0;
3530
3531 /* Case (2) / (3) */
3532 if (lp_enable_privileges()) {
3533
3534 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3535 &se_take_ownership);
3536 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3537 &se_restore);
3538
3539 /* Case (2) */
3540 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3541 /* Case (3) */
3542 ( has_restore_priv ) ) {
3543
3544 become_root();
3545 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3546 if (lp_posix_pathnames()) {
3547 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3548 (gid_t)-1);
3549 } else {
3550 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3551 (gid_t)-1);
3552 }
3553 unbecome_root();
3554 return ret;
3555 }
3556 }
3557
3558 /* Case (4). */
3559 if (!lp_dos_filemode(SNUM(conn))) {
3560 errno = EPERM;
3561 return -1;
3562 }
3563
3564 /* only allow chown to the current user. This is more secure,
3565 and also copes with the case where the SID in a take ownership ACL is
3566 a local SID on the users workstation
3567 */
3568 if (uid != current_user.ut.uid) {
3569 errno = EPERM;
3570 return -1;
3571 }
3572
3573 if (lp_posix_pathnames()) {
3574 ret = SMB_VFS_LSTAT(conn, smb_fname);
3575 } else {
3576 ret = SMB_VFS_STAT(conn, smb_fname);
3577 }
3578
3579 if (ret == -1) {
3580 return -1;
3581 }
3582
3583 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3584 return -1;
3585 }
3586
3587 become_root();
3588 /* Keep the current file gid the same. */
3589 if (fsp->fh->fd == -1) {
3590 if (lp_posix_pathnames()) {
3591 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3592 (gid_t)-1);
3593 } else {
3594 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3595 (gid_t)-1);
3596 }
3597 } else {
3598 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3599 }
3600 unbecome_root();
3601
3602 close_file_fchmod(NULL, fsp);
3603
3604 return ret;
3605 }
3606
3607 #if 0
3608 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3609
3610 /****************************************************************************
3611 Take care of parent ACL inheritance.
3612 ****************************************************************************/
3613
3614 NTSTATUS append_parent_acl(files_struct *fsp,
3615 const SEC_DESC *pcsd,
3616 SEC_DESC **pp_new_sd)
3617 {
3618 struct smb_filename *smb_dname = NULL;
3619 SEC_DESC *parent_sd = NULL;
3620 files_struct *parent_fsp = NULL;
3621 TALLOC_CTX *mem_ctx = talloc_tos();
3622 char *parent_name = NULL;
3623 SEC_ACE *new_ace = NULL;
3624 unsigned int num_aces = pcsd->dacl->num_aces;
3625 NTSTATUS status;
3626 int info;
3627 unsigned int i, j;
3628 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3629 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3630
3631 if (psd == NULL) {
3632 return NT_STATUS_NO_MEMORY;
3633 }
3634
3635 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3636 NULL)) {
3637 return NT_STATUS_NO_MEMORY;
3638 }
3639
3640 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3641 &smb_dname);
3642 if (!NT_STATUS_IS_OK(status)) {
3643 goto fail;
3644 }
3645
3646 status = SMB_VFS_CREATE_FILE(
3647 fsp->conn, /* conn */
3648 NULL, /* req */
3649 0, /* root_dir_fid */
3650 smb_dname, /* fname */
3651 FILE_READ_ATTRIBUTES, /* access_mask */
3652 FILE_SHARE_NONE, /* share_access */
3653 FILE_OPEN, /* create_disposition*/
3654 FILE_DIRECTORY_FILE, /* create_options */
3655 0, /* file_attributes */
3656 INTERNAL_OPEN_ONLY, /* oplock_request */
3657 0, /* allocation_size */
3658 NULL, /* sd */
3659 NULL, /* ea_list */
3660 &parent_fsp, /* result */
3661 &info); /* pinfo */
3662
3663 if (!NT_STATUS_IS_OK(status)) {
3664 TALLOC_FREE(smb_dname);
3665 return status;
3666 }
3667
3668 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3669 DACL_SECURITY_INFORMATION, &parent_sd );
3670
3671 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3672 TALLOC_FREE(smb_dname);
3673
3674 if (!NT_STATUS_IS_OK(status)) {
3675 return status;
3676 }
3677
3678 /*
3679 * Make room for potentially all the ACLs from
3680 * the parent. We used to add the ugw triple here,
3681 * as we knew we were dealing with POSIX ACLs.
3682 * We no longer need to do so as we can guarentee
3683 * that a default ACL from the parent directory will
3684 * be well formed for POSIX ACLs if it came from a
3685 * POSIX ACL source, and if we're not writing to a
3686 * POSIX ACL sink then we don't care if it's not well
3687 * formed. JRA.
3688 */
3689
3690 num_aces += parent_sd->dacl->num_aces;
3691
3692 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3693 num_aces)) == NULL) {
3694 return NT_STATUS_NO_MEMORY;
3695 }
3696
3697 /* Start by copying in all the given ACE entries. */
3698 for (i = 0; i < psd->dacl->num_aces; i++) {
3699 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3700 }
3701
3702 /*
3703 * Note that we're ignoring "inherit permissions" here
3704 * as that really only applies to newly created files. JRA.
3705 */
3706
3707 /* Finally append any inherited ACEs. */
3708 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3709 SEC_ACE *se = &parent_sd->dacl->aces[j];
3710
3711 if (fsp->is_directory) {
3712 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3713 /* Doesn't apply to a directory - ignore. */
3714 DEBUG(10,("append_parent_acl: directory %s "
3715 "ignoring non container "
3716 "inherit flags %u on ACE with sid %s "
3717 "from parent %s\n",
3718 fsp_str_dbg(fsp),
3719 (unsigned int)se->flags,
3720 sid_string_dbg(&se->trustee),
3721 parent_name));
3722 continue;
3723 }
3724 } else {
3725 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3726 /* Doesn't apply to a file - ignore. */
3727 DEBUG(10,("append_parent_acl: file %s "
3728 "ignoring non object "
3729 "inherit flags %u on ACE with sid %s "
3730 "from parent %s\n",
3731 fsp_str_dbg(fsp),
3732 (unsigned int)se->flags,
3733 sid_string_dbg(&se->trustee),
3734 parent_name));
3735 continue;
3736 }
3737 }
3738
3739 if (is_dacl_protected) {
3740 /* If the DACL is protected it means we must
3741 * not overwrite an existing ACE entry with the
3742 * same SID. This is order N^2. Ouch :-(. JRA. */
3743 unsigned int k;
3744 for (k = 0; k < psd->dacl->num_aces; k++) {
3745 if (sid_equal(&psd->dacl->aces[k].trustee,
3746 &se->trustee)) {
3747 break;
3748 }
3749 }
3750 if (k < psd->dacl->num_aces) {
3751 /* SID matched. Ignore. */
3752 DEBUG(10,("append_parent_acl: path %s "
3753 "ignoring ACE with protected sid %s "
3754 "from parent %s\n",
3755 fsp_str_dbg(fsp),
3756 sid_string_dbg(&se->trustee),
3757 parent_name));
3758 continue;
3759 }
3760 }
3761
3762 sec_ace_copy(&new_ace[i], se);
3763 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3764 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3765 }
3766 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3767
3768 if (fsp->is_directory) {
3769 /*
3770 * Strip off any inherit only. It's applied.
3771 */
3772 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3773 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3774 /* No further inheritance. */
3775 new_ace[i].flags &=
3776 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3777 SEC_ACE_FLAG_OBJECT_INHERIT);
3778 }
3779 } else {
3780 /*
3781 * Strip off any container or inherit
3782 * flags, they can't apply to objects.
3783 */
3784 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3785 SEC_ACE_FLAG_INHERIT_ONLY|
3786 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3787 }
3788 i++;
3789
3790 DEBUG(10,("append_parent_acl: path %s "
3791 "inheriting ACE with sid %s "
3792 "from parent %s\n",
3793 fsp_str_dbg(fsp),
3794 sid_string_dbg(&se->trustee),
3795 parent_name));
3796 }
3797
3798 psd->dacl->aces = new_ace;
3799 psd->dacl->num_aces = i;
3800 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3801 SE_DESC_DACL_AUTO_INHERIT_REQ);
3802
3803 *pp_new_sd = psd;
3804 return status;
3805 }
3806 #endif
3807
3808 /****************************************************************************
3809 Reply to set a security descriptor on an fsp. security_info_sent is the
3810 description of the following NT ACL.
3811 This should be the only external function needed for the UNIX style set ACL.
3812 ****************************************************************************/
3813
3814 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3815 {
3816 connection_struct *conn = fsp->conn;
3817 uid_t user = (uid_t)-1;
3818 gid_t grp = (gid_t)-1;
3819 DOM_SID file_owner_sid;
3820 DOM_SID file_grp_sid;
3821 canon_ace *file_ace_list = NULL;
3822 canon_ace *dir_ace_list = NULL;
3823 bool acl_perms = False;
3824 mode_t orig_mode = (mode_t)0;
3825 NTSTATUS status;
3826 bool set_acl_as_root = false;
3827 bool acl_set_support = false;
3828 bool ret = false;
3829
3830 DEBUG(10,("set_nt_acl: called for file %s\n",
3831 fsp_str_dbg(fsp)));
3832
3833 if (!CAN_WRITE(conn)) {
3834 DEBUG(10,("set acl rejected on read-only share\n"));
3835 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3836 }
3837
3838 /*
3839 * Get the current state of the file.
3840 */
3841
3842 status = vfs_stat_fsp(fsp);
3843 if (!NT_STATUS_IS_OK(status)) {
3844 return status;
3845 }
3846
3847 /* Save the original element we check against. */
3848 orig_mode = fsp->fsp_name->st.st_ex_mode;
3849
3850 /*
3851 * Unpack the user/group/world id's.
3852 */
3853
3854 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3855 if (!NT_STATUS_IS_OK(status)) {
3856 return status;
3857 }
3858
3859 /*
3860 * Do we need to chown ? If so this must be done first as the incoming
3861 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3862 * Noticed by Simo.
3863 */
3864
3865 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3866 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3867
3868 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3869 fsp_str_dbg(fsp), (unsigned int)user,
3870 (unsigned int)grp));
3871
3872 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3873 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3874 "= %s.\n", fsp_str_dbg(fsp),
3875 (unsigned int)user, (unsigned int)grp,
3876 strerror(errno)));
3877 if (errno == EPERM) {
3878 return NT_STATUS_INVALID_OWNER;
3879 }
3880 return map_nt_error_from_unix(errno);
3881 }
3882
3883 /*
3884 * Recheck the current state of the file, which may have changed.
3885 * (suid/sgid bits, for instance)
3886 */
3887
3888 status = vfs_stat_fsp(fsp);
3889 if (!NT_STATUS_IS_OK(status)) {
3890 return status;
3891 }
3892
3893 /* Save the original element we check against. */
3894 orig_mode = fsp->fsp_name->st.st_ex_mode;
3895
3896 /* If we successfully chowned, we know we must
3897 * be able to set the acl, so do it as root.
3898 */
3899 set_acl_as_root = true;
3900 }
3901
3902 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3903
3904 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3905 &file_grp_sid, &file_ace_list,
3906 &dir_ace_list, security_info_sent, psd);
3907
3908 /* Ignore W2K traverse DACL set. */
3909 if (!file_ace_list && !dir_ace_list) {
3910 return NT_STATUS_OK;
3911 }
3912
3913 if (!acl_perms) {
3914 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3915 free_canon_ace_list(file_ace_list);
3916 free_canon_ace_list(dir_ace_list);
3917 return NT_STATUS_ACCESS_DENIED;
3918 }
3919
3920 /*
3921 * Only change security if we got a DACL.
3922 */
3923
3924 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3925 free_canon_ace_list(file_ace_list);
3926 free_canon_ace_list(dir_ace_list);
3927 return NT_STATUS_OK;
3928 }
3929
3930 /*
3931 * Try using the POSIX ACL set first. Fall back to chmod if
3932 * we have no ACL support on this filesystem.
3933 */
3934
3935 if (acl_perms && file_ace_list) {
3936 if (set_acl_as_root) {
3937 become_root();
3938 }
3939 ret = set_canon_ace_list(fsp, file_ace_list, false,
3940 &fsp->fsp_name->st, &acl_set_support);
3941 if (set_acl_as_root) {
3942 unbecome_root();
3943 }
3944 if (acl_set_support && ret == false) {
3945 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3946 "%s (%s).\n", fsp_str_dbg(fsp),
3947 strerror(errno)));
3948 free_canon_ace_list(file_ace_list);
3949 free_canon_ace_list(dir_ace_list);
3950 return map_nt_error_from_unix(errno);
3951 }
3952 }
3953
3954 if (acl_perms && acl_set_support && fsp->is_directory) {
3955 if (dir_ace_list) {
3956 if (set_acl_as_root) {
3957 become_root();
3958 }
3959 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3960 &fsp->fsp_name->st,
3961 &acl_set_support);
3962 if (set_acl_as_root) {
3963 unbecome_root();
3964 }
3965 if (ret == false) {
3966 DEBUG(3,("set_nt_acl: failed to set default "
3967 "acl on directory %s (%s).\n",
3968 fsp_str_dbg(fsp), strerror(errno)));
3969 free_canon_ace_list(file_ace_list);
3970 free_canon_ace_list(dir_ace_list);
3971 return map_nt_error_from_unix(errno);
3972 }
3973 } else {
3974 int sret = -1;
3975
3976 /*
3977 * No default ACL - delete one if it exists.
3978 */
3979
3980 if (set_acl_as_root) {
3981 become_root();
3982 }
3983 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3984 fsp->fsp_name->base_name);
3985 if (set_acl_as_root) {
3986 unbecome_root();
3987 }
3988 if (sret == -1) {
3989 if (acl_group_override(conn, fsp->fsp_name)) {
3990 DEBUG(5,("set_nt_acl: acl group "
3991 "control on and current user "
3992 "in file %s primary group. "
3993 "Override delete_def_acl\n",
3994 fsp_str_dbg(fsp)));
3995
3996 become_root();
3997 sret =
3998 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3999 conn,
4000 fsp->fsp_name->base_name);
4001 unbecome_root();
4002 }
4003
4004 if (sret == -1) {
4005 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4006 free_canon_ace_list(file_ace_list);
4007 free_canon_ace_list(dir_ace_list);
4008 return map_nt_error_from_unix(errno);
4009 }
4010 }
4011 }
4012 }
4013
4014 if (acl_set_support) {
4015 if (set_acl_as_root) {
4016 become_root();
4017 }
4018 store_inheritance_attributes(fsp,
4019 file_ace_list,
4020 dir_ace_list,
4021 psd->type);
4022 if (set_acl_as_root) {
4023 unbecome_root();
4024 }
4025 }
4026
4027 /*
4028 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4029 */
4030
4031 if(!acl_set_support && acl_perms) {
4032 mode_t posix_perms;
4033
4034 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4035 free_canon_ace_list(file_ace_list);
4036 free_canon_ace_list(dir_ace_list);
4037 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4038 "posix permissions for file %s.\n",
4039 fsp_str_dbg(fsp)));
4040 return NT_STATUS_ACCESS_DENIED;
4041 }
4042
4043 if (orig_mode != posix_perms) {
4044 int sret = -1;
4045
4046 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4047 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4048
4049 if (set_acl_as_root) {
4050 become_root();
4051 }
4052 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4053 posix_perms);
4054 if (set_acl_as_root) {
4055 unbecome_root();
4056 }
4057 if(sret == -1) {
4058 if (acl_group_override(conn, fsp->fsp_name)) {
4059 DEBUG(5,("set_nt_acl: acl group "
4060 "control on and current user "
4061 "in file %s primary group. "
4062 "Override chmod\n",
4063 fsp_str_dbg(fsp)));
4064
4065 become_root();
4066 sret = SMB_VFS_CHMOD(conn,
4067 fsp->fsp_name->base_name,
4068 posix_perms);
4069 unbecome_root();
4070 }
4071
4072 if (sret == -1) {
4073 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4074 "failed. Error = %s.\n",
4075 fsp_str_dbg(fsp),
4076 (unsigned int)posix_perms,
4077 strerror(errno)));
4078 free_canon_ace_list(file_ace_list);
4079 free_canon_ace_list(dir_ace_list);
4080 return map_nt_error_from_unix(errno);
4081 }
4082 }
4083 }
4084 }
4085
4086 free_canon_ace_list(file_ace_list);
4087 free_canon_ace_list(dir_ace_list);
4088
4089 return NT_STATUS_OK;
4090 }
4091
4092 /****************************************************************************
4093 Get the actual group bits stored on a file with an ACL. Has no effect if
4094 the file has no ACL. Needed in dosmode code where the stat() will return
4095 the mask bits, not the real group bits, for a file with an ACL.
4096 ****************************************************************************/
4097
4098 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4099 {
4100 int entry_id = SMB_ACL_FIRST_ENTRY;
4101 SMB_ACL_ENTRY_T entry;
4102 SMB_ACL_T posix_acl;
4103 int result = -1;
4104
4105 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4106 if (posix_acl == (SMB_ACL_T)NULL)
4107 return -1;
4108
4109 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4110 SMB_ACL_TAG_T tagtype;
4111 SMB_ACL_PERMSET_T permset;
4112
4113 entry_id = SMB_ACL_NEXT_ENTRY;
4114
4115 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4116 break;
4117
4118 if (tagtype == SMB_ACL_GROUP_OBJ) {
4119 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4120 break;
4121 } else {
4122 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4123 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4124 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4125 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4126 result = 0;
4127 break;
4128 }
4129 }
4130 }
4131 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4132 return result;
4133 }
4134
4135 /****************************************************************************
4136 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4137 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4138 ****************************************************************************/
4139
4140 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4141 {
4142 int entry_id = SMB_ACL_FIRST_ENTRY;
4143 SMB_ACL_ENTRY_T entry;
4144 int num_entries = 0;
4145
4146 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4147 SMB_ACL_TAG_T tagtype;
4148 SMB_ACL_PERMSET_T permset;
4149 mode_t perms;
4150
4151 entry_id = SMB_ACL_NEXT_ENTRY;
4152
4153 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4154 return -1;
4155
4156 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4157 return -1;
4158
4159 num_entries++;
4160
4161 switch(tagtype) {
4162 case SMB_ACL_USER_OBJ:
4163 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4164 break;
4165 case SMB_ACL_GROUP_OBJ:
4166 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4167 break;
4168 case SMB_ACL_MASK:
4169 /*
4170 * FIXME: The ACL_MASK entry permissions should really be set to
4171 * the union of the permissions of all ACL_USER,
4172 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4173 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4174 */
4175 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4176 break;
4177 case SMB_ACL_OTHER:
4178 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4179 break;
4180 default:
4181 continue;
4182 }
4183
4184 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4185 return -1;
4186
4187 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4188 return -1;
4189 }
4190
4191 /*
4192 * If this is a simple 3 element ACL or no elements then it's a standard
4193 * UNIX permission set. Just use chmod...
4194 */
4195
4196 if ((num_entries == 3) || (num_entries == 0))
4197 return -1;
4198
4199 return 0;
4200 }
4201
4202 /****************************************************************************
4203 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4204 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4205 resulting ACL on TO. Note that name is in UNIX character set.
4206 ****************************************************************************/
4207
4208 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4209 {
4210 SMB_ACL_T posix_acl = NULL;
4211 int ret = -1;
4212
4213 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4214 return -1;
4215
4216 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4217 goto done;
4218
4219 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4220
4221 done:
4222
4223 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4224 return ret;
4225 }
4226
4227 /****************************************************************************
4228 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4229 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4230 Note that name is in UNIX character set.
4231 ****************************************************************************/
4232
4233 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4234 {
4235 return copy_access_posix_acl(conn, name, name, mode);
4236 }
4237
4238 /****************************************************************************
4239 Check for an existing default POSIX ACL on a directory.
4240 ****************************************************************************/
4241
4242 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4243 {
4244 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4245 bool has_acl = False;
4246 SMB_ACL_ENTRY_T entry;
4247
4248 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4249 has_acl = True;
4250 }
4251
4252 if (def_acl) {
4253 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4254 }
4255 return has_acl;
4256 }
4257
4258 /****************************************************************************
4259 If the parent directory has no default ACL but it does have an Access ACL,
4260 inherit this Access ACL to file name.
4261 ****************************************************************************/
4262
4263 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4264 const char *name, mode_t mode)
4265 {
4266 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4267 return 0;
4268
4269 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4270 }
4271
4272 /****************************************************************************
4273 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4274 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4275 ****************************************************************************/
4276
4277 int fchmod_acl(files_struct *fsp, mode_t mode)
4278 {
4279 connection_struct *conn = fsp->conn;
4280 SMB_ACL_T posix_acl = NULL;
4281 int ret = -1;
4282
4283 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4284 return -1;
4285
4286 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4287 goto done;
4288
4289 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4290
4291 done:
4292
4293 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4294 return ret;
4295 }
4296
4297 /****************************************************************************
4298 Map from wire type to permset.
4299 ****************************************************************************/
4300
4301 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4302 {
4303 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4304 return False;
4305 }
4306
4307 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4308 return False;
4309 }
4310
4311 if (wire_perm & SMB_POSIX_ACL_READ) {
4312 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4313 return False;
4314 }
4315 }
4316 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4317 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4318 return False;
4319 }
4320 }
4321 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4322 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4323 return False;
4324 }
4325 }
4326 return True;
4327 }
4328
4329 /****************************************************************************
4330 Map from wire type to tagtype.
4331 ****************************************************************************/
4332
4333 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4334 {
4335 switch (wire_tt) {
4336 case SMB_POSIX_ACL_USER_OBJ:
4337 *p_tt = SMB_ACL_USER_OBJ;
4338 break;
4339 case SMB_POSIX_ACL_USER:
4340 *p_tt = SMB_ACL_USER;
4341 break;
4342 case SMB_POSIX_ACL_GROUP_OBJ:
4343 *p_tt = SMB_ACL_GROUP_OBJ;
4344 break;
4345 case SMB_POSIX_ACL_GROUP:
4346 *p_tt = SMB_ACL_GROUP;
4347 break;
4348 case SMB_POSIX_ACL_MASK:
4349 *p_tt = SMB_ACL_MASK;
4350 break;
4351 case SMB_POSIX_ACL_OTHER:
4352 *p_tt = SMB_ACL_OTHER;
4353 break;
4354 default:
4355 return False;
4356 }
4357 return True;
4358 }
4359
4360 /****************************************************************************
4361 Create a new POSIX acl from wire permissions.
4362 FIXME ! How does the share mask/mode fit into this.... ?
4363 ****************************************************************************/
4364
4365 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4366 {
4367 unsigned int i;
4368 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4369
4370 if (the_acl == NULL) {
4371 return NULL;
4372 }
4373
4374 for (i = 0; i < num_acls; i++) {
4375 SMB_ACL_ENTRY_T the_entry;
4376 SMB_ACL_PERMSET_T the_permset;
4377 SMB_ACL_TAG_T tag_type;
4378
4379 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4380 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4381 i, strerror(errno) ));
4382 goto fail;
4383 }
4384
4385 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4386 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4387 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4388 goto fail;
4389 }
4390
4391 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4392 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4393 i, strerror(errno) ));
4394 goto fail;
4395 }
4396
4397 /* Get the permset pointer from the new ACL entry. */
4398 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4399 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4400 i, strerror(errno) ));
4401 goto fail;
4402 }
4403
4404 /* Map from wire to permissions. */
4405 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4406 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4407 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4408 goto fail;
4409 }
4410
4411 /* Now apply to the new ACL entry. */
4412 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4413 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4414 i, strerror(errno) ));
4415 goto fail;
4416 }
4417
4418 if (tag_type == SMB_ACL_USER) {
4419 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4420 uid_t uid = (uid_t)uidval;
4421 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4422 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4423 (unsigned int)uid, i, strerror(errno) ));
4424 goto fail;
4425 }
4426 }
4427
4428 if (tag_type == SMB_ACL_GROUP) {
4429 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4430 gid_t gid = (uid_t)gidval;
4431 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4432 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4433 (unsigned int)gid, i, strerror(errno) ));
4434 goto fail;
4435 }
4436 }
4437 }
4438
4439 return the_acl;
4440
4441 fail:
4442
4443 if (the_acl != NULL) {
4444 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4445 }
4446 return NULL;
4447 }
4448
4449 /****************************************************************************
4450 Calls from UNIX extensions - Default POSIX ACL set.
4451 If num_def_acls == 0 and not a directory just return. If it is a directory
4452 and num_def_acls == 0 then remove the default acl. Else set the default acl
4453 on the directory.
4454 ****************************************************************************/
4455
4456 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4457 uint16 num_def_acls, const char *pdata)
4458 {
4459 SMB_ACL_T def_acl = NULL;
4460
4461 if (!S_ISDIR(psbuf->st_ex_mode)) {
4462 if (num_def_acls) {
4463 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4464 errno = EISDIR;
4465 return False;
4466 } else {
4467 return True;
4468 }
4469 }
4470
4471 if (!num_def_acls) {
4472 /* Remove the default ACL. */
4473 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4474 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4475 fname, strerror(errno) ));
4476 return False;
4477 }
4478 return True;
4479 }
4480
4481 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4482 return False;
4483 }
4484
4485 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4486 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4487 fname, strerror(errno) ));
4488 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4489 return False;
4490 }
4491
4492 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4493 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4494 return True;
4495 }
4496
4497 /****************************************************************************
4498 Remove an ACL from a file. As we don't have acl_delete_entry() available
4499 we must read the current acl and copy all entries except MASK, USER and GROUP
4500 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4501 removed.
4502 FIXME ! How does the share mask/mode fit into this.... ?
4503 ****************************************************************************/
4504
4505 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4506 {
4507 SMB_ACL_T file_acl = NULL;
4508 int entry_id = SMB_ACL_FIRST_ENTRY;
4509 SMB_ACL_ENTRY_T entry;
4510 bool ret = False;
4511 /* Create a new ACL with only 3 entries, u/g/w. */
4512 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4513 SMB_ACL_ENTRY_T user_ent = NULL;
4514 SMB_ACL_ENTRY_T group_ent = NULL;
4515 SMB_ACL_ENTRY_T other_ent = NULL;
4516
4517 if (new_file_acl == NULL) {
4518 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4519 return False;
4520 }
4521
4522 /* Now create the u/g/w entries. */
4523 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4524 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4525 fname, strerror(errno) ));
4526 goto done;
4527 }
4528 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4529 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4530 fname, strerror(errno) ));
4531 goto done;
4532 }
4533
4534 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4535 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4536 fname, strerror(errno) ));
4537 goto done;
4538 }
4539 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4540 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4541 fname, strerror(errno) ));
4542 goto done;
4543 }
4544
4545 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4546 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4547 fname, strerror(errno) ));
4548 goto done;
4549 }
4550 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4551 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4552 fname, strerror(errno) ));
4553 goto done;
4554 }
4555
4556 /* Get the current file ACL. */
4557 if (fsp && fsp->fh->fd != -1) {
4558 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4559 } else {
4560 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4561 }
4562
4563 if (file_acl == NULL) {
4564 /* This is only returned if an error occurred. Even for a file with
4565 no acl a u/g/w acl should be returned. */
4566 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4567 fname, strerror(errno) ));
4568 goto done;
4569 }
4570
4571 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4572 SMB_ACL_TAG_T tagtype;
4573 SMB_ACL_PERMSET_T permset;
4574
4575 entry_id = SMB_ACL_NEXT_ENTRY;
4576
4577 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4578 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4579 fname, strerror(errno) ));
4580 goto done;
4581 }
4582
4583 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4584 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4585 fname, strerror(errno) ));
4586 goto done;
4587 }
4588
4589 if (tagtype == SMB_ACL_USER_OBJ) {
4590 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4591 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4592 fname, strerror(errno) ));
4593 }
4594 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4595 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4596 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4597 fname, strerror(errno) ));
4598 }
4599 } else if (tagtype == SMB_ACL_OTHER) {
4600 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4601 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4602 fname, strerror(errno) ));
4603 }
4604 }
4605 }
4606
4607 /* Set the new empty file ACL. */
4608 if (fsp && fsp->fh->fd != -1) {
4609 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4610 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4611 fname, strerror(errno) ));
4612 goto done;
4613 }
4614 } else {
4615 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4616 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4617 fname, strerror(errno) ));
4618 goto done;
4619 }
4620 }
4621
4622 ret = True;
4623
4624 done:
4625
4626 if (file_acl) {
4627 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4628 }
4629 if (new_file_acl) {
4630 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4631 }
4632 return ret;
4633 }
4634
4635 /****************************************************************************
4636 Calls from UNIX extensions - POSIX ACL set.
4637 If num_def_acls == 0 then read/modify/write acl after removing all entries
4638 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4639 ****************************************************************************/
4640
4641 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4642 {
4643 SMB_ACL_T file_acl = NULL;
4644
4645 if (!num_acls) {
4646 /* Remove the ACL from the file. */
4647 return remove_posix_acl(conn, fsp, fname);
4648 }
4649
4650 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4651 return False;
4652 }
4653
4654 if (fsp && fsp->fh->fd != -1) {
4655 /* The preferred way - use an open fd. */
4656 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4657 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4658 fname, strerror(errno) ));
4659 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4660 return False;
4661 }
4662 } else {
4663 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4664 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4665 fname, strerror(errno) ));
4666 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4667 return False;
4668 }
4669 }
4670
4671 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4672 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4673 return True;
4674 }
4675
4676 /********************************************************************
4677 Pull the NT ACL from a file on disk or the OpenEventlog() access
4678 check. Caller is responsible for freeing the returned security
4679 descriptor via TALLOC_FREE(). This is designed for dealing with
4680 user space access checks in smbd outside of the VFS. For example,
4681 checking access rights in OpenEventlog().
4682
4683 Assume we are dealing with files (for now)
4684 ********************************************************************/
4685
4686 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4687 {
4688 SEC_DESC *psd, *ret_sd;
4689 connection_struct *conn;
4690 files_struct finfo;
4691 struct fd_handle fh;
4692 NTSTATUS status;
4693
4694 conn = TALLOC_ZERO_P(ctx, connection_struct);
4695 if (conn == NULL) {
4696 DEBUG(0, ("talloc failed\n"));
4697 return NULL;
4698 }
4699
4700 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4701 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4702 TALLOC_FREE(conn);
4703 return NULL;
4704 }
4705
4706 conn->params->service = -1;
4707
4708 set_conn_connectpath(conn, "/");
4709
4710 if (!smbd_vfs_init(conn)) {
4711 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4712 conn_free(conn);
4713 return NULL;
4714 }
4715
4716 ZERO_STRUCT( finfo );
4717 ZERO_STRUCT( fh );
4718
4719 finfo.fnum = -1;
4720 finfo.conn = conn;
4721 finfo.fh = &fh;
4722 finfo.fh->fd = -1;
4723
4724 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4725 &finfo.fsp_name);
4726 if (!NT_STATUS_IS_OK(status)) {
4727 conn_free(conn);
4728 return NULL;
4729 }
4730
4731 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4732 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4733 TALLOC_FREE(finfo.fsp_name);
4734 conn_free(conn);
4735 return NULL;
4736 }
4737
4738 ret_sd = dup_sec_desc( ctx, psd );
4739
4740 TALLOC_FREE(finfo.fsp_name);
4741 conn_free(conn);
4742
4743 return ret_sd;
4744 }
Crístian's Samba branch