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s4-smbtorture: rename test_EnumDomain{Users,Groups,Aliases} in RPC-SAMR.
[Samba/gbeck.git] / source3 / smbd / posix_acls.c
blob8d172e17bd9fcd3e70242a461c7a9371f1eef33d
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern const struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 uint8_t ace_flags; /* From windows ACE entry. */
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk - version 1.
59 * All values are little endian.
60 *
61 * | 1 | 1 | 2 | 2 | ....
62 * +------+------+-------------+---------------------+-------------+--------------------+
63 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 *
66 * Entry format is :
67 *
68 * | 1 | 4 |
69 * +------+-------------------+
70 * | value| uid/gid or world |
71 * | type | value |
72 * +------+-------------------+
73 *
74 * Version 2 format. Stores extra Windows metadata about an ACL.
75 *
76 * | 1 | 2 | 2 | 2 | ....
77 * +------+----------+-------------+---------------------+-------------+--------------------+
78 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
79 * | 2 | type | | | | |
80 * +------+----------+-------------+---------------------+-------------+--------------------+
81 *
82 * Entry format is :
83 *
84 * | 1 | 1 | 4 |
85 * +------+------+-------------------+
86 * | ace | value| uid/gid or world |
87 * | flag | type | value |
88 * +------+-------------------+------+
89 *
90 */
91
92 #define PAI_VERSION_OFFSET 0
93
94 #define PAI_V1_FLAG_OFFSET 1
95 #define PAI_V1_NUM_ENTRIES_OFFSET 2
96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97 #define PAI_V1_ENTRIES_BASE 6
98 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
99 #define PAI_V1_ENTRY_LENGTH 5
100
101 #define PAI_V1_VERSION 1
102
103 #define PAI_V2_TYPE_OFFSET 1
104 #define PAI_V2_NUM_ENTRIES_OFFSET 3
105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106 #define PAI_V2_ENTRIES_BASE 7
107 #define PAI_V2_ENTRY_LENGTH 6
108
109 #define PAI_V2_VERSION 2
110
111 /*
112 * In memory format of user.SAMBA_PAI attribute.
113 */
114
115 struct pai_entry {
116 struct pai_entry *next, *prev;
117 uint8_t ace_flags;
118 enum ace_owner owner_type;
119 posix_id unix_ug;
120 };
121
122 struct pai_val {
123 uint16_t sd_type;
124 unsigned int num_entries;
125 struct pai_entry *entry_list;
126 unsigned int num_def_entries;
127 struct pai_entry *def_entry_list;
128 };
129
130 /************************************************************************
131 Return a uint32 of the pai_entry principal.
132 ************************************************************************/
133
134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
135 {
136 switch (paie->owner_type) {
137 case UID_ACE:
138 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139 return (uint32_t)paie->unix_ug.uid;
140 case GID_ACE:
141 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142 return (uint32_t)paie->unix_ug.gid;
143 case WORLD_ACE:
144 default:
145 DEBUG(10,("get_pai_entry_val: world ace\n"));
146 return (uint32_t)-1;
147 }
148 }
149
150 /************************************************************************
151 Return a uint32 of the entry principal.
152 ************************************************************************/
153
154 static uint32_t get_entry_val(canon_ace *ace_entry)
155 {
156 switch (ace_entry->owner_type) {
157 case UID_ACE:
158 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159 return (uint32_t)ace_entry->unix_ug.uid;
160 case GID_ACE:
161 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162 return (uint32_t)ace_entry->unix_ug.gid;
163 case WORLD_ACE:
164 default:
165 DEBUG(10,("get_entry_val: world ace\n"));
166 return (uint32_t)-1;
167 }
168 }
169
170 /************************************************************************
171 Create the on-disk format (always v2 now). Caller must free.
172 ************************************************************************/
173
174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
175 canon_ace *dir_ace_list,
176 uint16_t sd_type,
177 size_t *store_size)
178 {
179 char *pai_buf = NULL;
180 canon_ace *ace_list = NULL;
181 char *entry_offset = NULL;
182 unsigned int num_entries = 0;
183 unsigned int num_def_entries = 0;
184
185 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
186 num_entries++;
187 }
188
189 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
190 num_def_entries++;
191 }
192
193 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
194
195 *store_size = PAI_V2_ENTRIES_BASE +
196 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
197
198 pai_buf = (char *)SMB_MALLOC(*store_size);
199 if (!pai_buf) {
200 return NULL;
201 }
202
203 /* Set up the header. */
204 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
205 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
206 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
207 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
208 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
209
210 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
211
212 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
213 uint8_t type_val = (uint8_t)ace_list->owner_type;
214 uint32_t entry_val = get_entry_val(ace_list);
215
216 SCVAL(entry_offset,0,ace_list->ace_flags);
217 SCVAL(entry_offset,1,type_val);
218 SIVAL(entry_offset,2,entry_val);
219 entry_offset += PAI_V2_ENTRY_LENGTH;
220 }
221
222 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
223 uint8_t type_val = (uint8_t)ace_list->owner_type;
224 uint32_t entry_val = get_entry_val(ace_list);
225
226 SCVAL(entry_offset,0,ace_list->ace_flags);
227 SCVAL(entry_offset,1,type_val);
228 SIVAL(entry_offset,2,entry_val);
229 entry_offset += PAI_V2_ENTRY_LENGTH;
230 }
231
232 return pai_buf;
233 }
234
235 /************************************************************************
236 Store the user.SAMBA_PAI attribute on disk.
237 ************************************************************************/
238
239 static void store_inheritance_attributes(files_struct *fsp,
240 canon_ace *file_ace_list,
241 canon_ace *dir_ace_list,
242 uint16_t sd_type)
243 {
244 int ret;
245 size_t store_size;
246 char *pai_buf;
247
248 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
249 return;
250 }
251
252 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
253 sd_type, &store_size);
254
255 if (fsp->fh->fd != -1) {
256 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
257 pai_buf, store_size, 0);
258 } else {
259 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
260 pai_buf, store_size, 0);
261 }
262
263 SAFE_FREE(pai_buf);
264
265 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
266 (unsigned int)sd_type,
267 fsp->fsp_name));
268
269 if (ret == -1 && !no_acl_syscall_error(errno)) {
270 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
271 }
272 }
273
274 /************************************************************************
275 Delete the in memory inheritance info.
276 ************************************************************************/
277
278 static void free_inherited_info(struct pai_val *pal)
279 {
280 if (pal) {
281 struct pai_entry *paie, *paie_next;
282 for (paie = pal->entry_list; paie; paie = paie_next) {
283 paie_next = paie->next;
284 SAFE_FREE(paie);
285 }
286 for (paie = pal->def_entry_list; paie; paie = paie_next) {
287 paie_next = paie->next;
288 SAFE_FREE(paie);
289 }
290 SAFE_FREE(pal);
291 }
292 }
293
294 /************************************************************************
295 Get any stored ACE flags.
296 ************************************************************************/
297
298 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
299 {
300 struct pai_entry *paie;
301
302 if (!pal) {
303 return 0;
304 }
305
306 /* If the entry exists it is inherited. */
307 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
308 if (ace_entry->owner_type == paie->owner_type &&
309 get_entry_val(ace_entry) == get_pai_entry_val(paie))
310 return paie->ace_flags;
311 }
312 return 0;
313 }
314
315 /************************************************************************
316 Ensure an attribute just read is valid - v1.
317 ************************************************************************/
318
319 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
320 {
321 uint16 num_entries;
322 uint16 num_def_entries;
323
324 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
325 /* Corrupted - too small. */
326 return false;
327 }
328
329 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
330 return false;
331 }
332
333 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
334 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
335
336 /* Check the entry lists match. */
337 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
338
339 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
340 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
341 return false;
342 }
343
344 return true;
345 }
346
347 /************************************************************************
348 Ensure an attribute just read is valid - v2.
349 ************************************************************************/
350
351 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
352 {
353 uint16 num_entries;
354 uint16 num_def_entries;
355
356 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
357 /* Corrupted - too small. */
358 return false;
359 }
360
361 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
362 return false;
363 }
364
365 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
366 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
367
368 /* Check the entry lists match. */
369 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
370
371 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
372 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
373 return false;
374 }
375
376 return true;
377 }
378
379 /************************************************************************
380 Decode the owner.
381 ************************************************************************/
382
383 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
384 {
385 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
386 switch( paie->owner_type) {
387 case UID_ACE:
388 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
389 DEBUG(10,("get_pai_owner_type: uid = %u\n",
390 (unsigned int)paie->unix_ug.uid ));
391 break;
392 case GID_ACE:
393 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
394 DEBUG(10,("get_pai_owner_type: gid = %u\n",
395 (unsigned int)paie->unix_ug.gid ));
396 break;
397 case WORLD_ACE:
398 paie->unix_ug.world = -1;
399 DEBUG(10,("get_pai_owner_type: world ace\n"));
400 break;
401 default:
402 return false;
403 }
404 return true;
405 }
406
407 /************************************************************************
408 Process v2 entries.
409 ************************************************************************/
410
411 static const char *create_pai_v1_entries(struct pai_val *paiv,
412 const char *entry_offset,
413 bool def_entry)
414 {
415 int i;
416
417 for (i = 0; i < paiv->num_entries; i++) {
418 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
419 if (!paie) {
420 return NULL;
421 }
422
423 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
424 if (!get_pai_owner_type(paie, entry_offset)) {
425 return NULL;
426 }
427
428 if (!def_entry) {
429 DLIST_ADD(paiv->entry_list, paie);
430 } else {
431 DLIST_ADD(paiv->def_entry_list, paie);
432 }
433 entry_offset += PAI_V1_ENTRY_LENGTH;
434 }
435 return entry_offset;
436 }
437
438 /************************************************************************
439 Convert to in-memory format from version 1.
440 ************************************************************************/
441
442 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
443 {
444 const char *entry_offset;
445 struct pai_val *paiv = NULL;
446
447 if (!check_pai_ok_v1(buf, size)) {
448 return NULL;
449 }
450
451 paiv = SMB_MALLOC_P(struct pai_val);
452 if (!paiv) {
453 return NULL;
454 }
455
456 memset(paiv, '\0', sizeof(struct pai_val));
457
458 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
459 SE_DESC_DACL_PROTECTED : 0;
460
461 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
462 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
463
464 entry_offset = buf + PAI_V1_ENTRIES_BASE;
465
466 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
467 paiv->num_entries, paiv->num_def_entries ));
468
469 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
470 if (entry_offset == NULL) {
471 free_inherited_info(paiv);
472 return NULL;
473 }
474 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
475 if (entry_offset == NULL) {
476 free_inherited_info(paiv);
477 return NULL;
478 }
479
480 return paiv;
481 }
482
483 /************************************************************************
484 Process v2 entries.
485 ************************************************************************/
486
487 static const char *create_pai_v2_entries(struct pai_val *paiv,
488 const char *entry_offset,
489 bool def_entry)
490 {
491 int i;
492
493 for (i = 0; i < paiv->num_entries; i++) {
494 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
495 if (!paie) {
496 return NULL;
497 }
498
499 paie->ace_flags = CVAL(entry_offset,0);
500
501 entry_offset++;
502
503 if (!get_pai_owner_type(paie, entry_offset)) {
504 return NULL;
505 }
506 if (!def_entry) {
507 DLIST_ADD(paiv->entry_list, paie);
508 } else {
509 DLIST_ADD(paiv->def_entry_list, paie);
510 }
511 entry_offset += PAI_V2_ENTRY_LENGTH;
512 }
513 return entry_offset;
514 }
515
516 /************************************************************************
517 Convert to in-memory format from version 2.
518 ************************************************************************/
519
520 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
521 {
522 const char *entry_offset;
523 struct pai_val *paiv = NULL;
524
525 if (!check_pai_ok_v2(buf, size)) {
526 return NULL;
527 }
528
529 paiv = SMB_MALLOC_P(struct pai_val);
530 if (!paiv) {
531 return NULL;
532 }
533
534 memset(paiv, '\0', sizeof(struct pai_val));
535
536 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
537
538 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
539 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
540
541 entry_offset = buf + PAI_V2_ENTRIES_BASE;
542
543 DEBUG(10,("create_pai_val_v2: num_entries = %u, num_def_entries = %u\n",
544 paiv->num_entries, paiv->num_def_entries ));
545
546 entry_offset = create_pai_v2_entries(paiv, entry_offset, false);
547 if (entry_offset == NULL) {
548 free_inherited_info(paiv);
549 return NULL;
550 }
551 entry_offset = create_pai_v2_entries(paiv, entry_offset, true);
552 if (entry_offset == NULL) {
553 free_inherited_info(paiv);
554 return NULL;
555 }
556
557 return paiv;
558 }
559
560 /************************************************************************
561 Convert to in-memory format - from either version 1 or 2.
562 ************************************************************************/
563
564 static struct pai_val *create_pai_val(const char *buf, size_t size)
565 {
566 if (size < 1) {
567 return NULL;
568 }
569 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
570 return create_pai_val_v1(buf, size);
571 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
572 return create_pai_val_v2(buf, size);
573 } else {
574 return NULL;
575 }
576 }
577
578 /************************************************************************
579 Load the user.SAMBA_PAI attribute.
580 ************************************************************************/
581
582 static struct pai_val *fload_inherited_info(files_struct *fsp)
583 {
584 char *pai_buf;
585 size_t pai_buf_size = 1024;
586 struct pai_val *paiv = NULL;
587 ssize_t ret;
588
589 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
590 return NULL;
591 }
592
593 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
594 return NULL;
595 }
596
597 do {
598 if (fsp->fh->fd != -1) {
599 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
600 pai_buf, pai_buf_size);
601 } else {
602 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
603 pai_buf, pai_buf_size);
604 }
605
606 if (ret == -1) {
607 if (errno != ERANGE) {
608 break;
609 }
610 /* Buffer too small - enlarge it. */
611 pai_buf_size *= 2;
612 SAFE_FREE(pai_buf);
613 if (pai_buf_size > 1024*1024) {
614 return NULL; /* Limit malloc to 1mb. */
615 }
616 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
617 return NULL;
618 }
619 } while (ret == -1);
620
621 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
622
623 if (ret == -1) {
624 /* No attribute or not supported. */
625 #if defined(ENOATTR)
626 if (errno != ENOATTR)
627 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
628 #else
629 if (errno != ENOSYS)
630 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
631 #endif
632 SAFE_FREE(pai_buf);
633 return NULL;
634 }
635
636 paiv = create_pai_val(pai_buf, ret);
637
638 if (paiv) {
639 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
640 (unsigned int)paiv->sd_type,
641 fsp->fsp_name));
642 }
643
644 SAFE_FREE(pai_buf);
645 return paiv;
646 }
647
648 /************************************************************************
649 Load the user.SAMBA_PAI attribute.
650 ************************************************************************/
651
652 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
653 const char *fname)
654 {
655 char *pai_buf;
656 size_t pai_buf_size = 1024;
657 struct pai_val *paiv = NULL;
658 ssize_t ret;
659
660 if (!lp_map_acl_inherit(SNUM(conn))) {
661 return NULL;
662 }
663
664 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
665 return NULL;
666 }
667
668 do {
669 ret = SMB_VFS_GETXATTR(conn, fname,
670 SAMBA_POSIX_INHERITANCE_EA_NAME,
671 pai_buf, pai_buf_size);
672
673 if (ret == -1) {
674 if (errno != ERANGE) {
675 break;
676 }
677 /* Buffer too small - enlarge it. */
678 pai_buf_size *= 2;
679 SAFE_FREE(pai_buf);
680 if (pai_buf_size > 1024*1024) {
681 return NULL; /* Limit malloc to 1mb. */
682 }
683 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
684 return NULL;
685 }
686 } while (ret == -1);
687
688 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
689
690 if (ret == -1) {
691 /* No attribute or not supported. */
692 #if defined(ENOATTR)
693 if (errno != ENOATTR)
694 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
695 #else
696 if (errno != ENOSYS)
697 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
698 #endif
699 SAFE_FREE(pai_buf);
700 return NULL;
701 }
702
703 paiv = create_pai_val(pai_buf, ret);
704
705 if (paiv) {
706 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
707 (unsigned int)paiv->sd_type,
708 fname));
709 }
710
711 SAFE_FREE(pai_buf);
712 return paiv;
713 }
714
715 /****************************************************************************
716 Functions to manipulate the internal ACE format.
717 ****************************************************************************/
718
719 /****************************************************************************
720 Count a linked list of canonical ACE entries.
721 ****************************************************************************/
722
723 static size_t count_canon_ace_list( canon_ace *l_head )
724 {
725 size_t count = 0;
726 canon_ace *ace;
727
728 for (ace = l_head; ace; ace = ace->next)
729 count++;
730
731 return count;
732 }
733
734 /****************************************************************************
735 Free a linked list of canonical ACE entries.
736 ****************************************************************************/
737
738 static void free_canon_ace_list( canon_ace *l_head )
739 {
740 canon_ace *list, *next;
741
742 for (list = l_head; list; list = next) {
743 next = list->next;
744 DLIST_REMOVE(l_head, list);
745 SAFE_FREE(list);
746 }
747 }
748
749 /****************************************************************************
750 Function to duplicate a canon_ace entry.
751 ****************************************************************************/
752
753 static canon_ace *dup_canon_ace( canon_ace *src_ace)
754 {
755 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
756
757 if (dst_ace == NULL)
758 return NULL;
759
760 *dst_ace = *src_ace;
761 dst_ace->prev = dst_ace->next = NULL;
762 return dst_ace;
763 }
764
765 /****************************************************************************
766 Print out a canon ace.
767 ****************************************************************************/
768
769 static void print_canon_ace(canon_ace *pace, int num)
770 {
771 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
772 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
773 if (pace->owner_type == UID_ACE) {
774 const char *u_name = uidtoname(pace->unix_ug.uid);
775 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
776 } else if (pace->owner_type == GID_ACE) {
777 char *g_name = gidtoname(pace->unix_ug.gid);
778 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
779 } else
780 dbgtext( "other ");
781 switch (pace->type) {
782 case SMB_ACL_USER:
783 dbgtext( "SMB_ACL_USER ");
784 break;
785 case SMB_ACL_USER_OBJ:
786 dbgtext( "SMB_ACL_USER_OBJ ");
787 break;
788 case SMB_ACL_GROUP:
789 dbgtext( "SMB_ACL_GROUP ");
790 break;
791 case SMB_ACL_GROUP_OBJ:
792 dbgtext( "SMB_ACL_GROUP_OBJ ");
793 break;
794 case SMB_ACL_OTHER:
795 dbgtext( "SMB_ACL_OTHER ");
796 break;
797 default:
798 dbgtext( "MASK " );
799 break;
800 }
801
802 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
803 dbgtext( "perms ");
804 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
805 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
806 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
807 }
808
809 /****************************************************************************
810 Print out a canon ace list.
811 ****************************************************************************/
812
813 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
814 {
815 int count = 0;
816
817 if( DEBUGLVL( 10 )) {
818 dbgtext( "print_canon_ace_list: %s\n", name );
819 for (;ace_list; ace_list = ace_list->next, count++)
820 print_canon_ace(ace_list, count );
821 }
822 }
823
824 /****************************************************************************
825 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
826 ****************************************************************************/
827
828 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
829 {
830 mode_t ret = 0;
831
832 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
833 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
834 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
835
836 return ret;
837 }
838
839 /****************************************************************************
840 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
841 ****************************************************************************/
842
843 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
844 {
845 mode_t ret = 0;
846
847 if (mode & r_mask)
848 ret |= S_IRUSR;
849 if (mode & w_mask)
850 ret |= S_IWUSR;
851 if (mode & x_mask)
852 ret |= S_IXUSR;
853
854 return ret;
855 }
856
857 /****************************************************************************
858 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
859 an SMB_ACL_PERMSET_T.
860 ****************************************************************************/
861
862 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
863 {
864 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
865 return -1;
866 if (mode & S_IRUSR) {
867 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
868 return -1;
869 }
870 if (mode & S_IWUSR) {
871 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
872 return -1;
873 }
874 if (mode & S_IXUSR) {
875 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
876 return -1;
877 }
878 return 0;
879 }
880
881 /****************************************************************************
882 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
883 ****************************************************************************/
884
885 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
886 {
887 uid_to_sid( powner_sid, psbuf->st_uid );
888 gid_to_sid( pgroup_sid, psbuf->st_gid );
889 }
890
891 /****************************************************************************
892 Is the identity in two ACEs equal ? Check both SID and uid/gid.
893 ****************************************************************************/
894
895 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
896 {
897 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
898 return True;
899 }
900 if (ace1->owner_type == ace2->owner_type) {
901 if (ace1->owner_type == UID_ACE &&
902 ace1->unix_ug.uid == ace2->unix_ug.uid) {
903 return True;
904 } else if (ace1->owner_type == GID_ACE &&
905 ace1->unix_ug.gid == ace2->unix_ug.gid) {
906 return True;
907 }
908 }
909 return False;
910 }
911
912 /****************************************************************************
913 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
914 delete the second one. If the first is deny, mask the permissions off and delete the allow
915 if the permissions become zero, delete the deny if the permissions are non zero.
916 ****************************************************************************/
917
918 static void merge_aces( canon_ace **pp_list_head )
919 {
920 canon_ace *l_head = *pp_list_head;
921 canon_ace *curr_ace_outer;
922 canon_ace *curr_ace_outer_next;
923
924 /*
925 * First, merge allow entries with identical SIDs, and deny entries
926 * with identical SIDs.
927 */
928
929 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
930 canon_ace *curr_ace;
931 canon_ace *curr_ace_next;
932
933 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
934
935 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
936
937 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
938
939 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
940 (curr_ace->attr == curr_ace_outer->attr)) {
941
942 if( DEBUGLVL( 10 )) {
943 dbgtext("merge_aces: Merging ACE's\n");
944 print_canon_ace( curr_ace_outer, 0);
945 print_canon_ace( curr_ace, 0);
946 }
947
948 /* Merge two allow or two deny ACE's. */
949
950 curr_ace_outer->perms |= curr_ace->perms;
951 DLIST_REMOVE(l_head, curr_ace);
952 SAFE_FREE(curr_ace);
953 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
954 }
955 }
956 }
957
958 /*
959 * Now go through and mask off allow permissions with deny permissions.
960 * We can delete either the allow or deny here as we know that each SID
961 * appears only once in the list.
962 */
963
964 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
965 canon_ace *curr_ace;
966 canon_ace *curr_ace_next;
967
968 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
969
970 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
971
972 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
973
974 /*
975 * Subtract ACE's with different entries. Due to the ordering constraints
976 * we've put on the ACL, we know the deny must be the first one.
977 */
978
979 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
980 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
981
982 if( DEBUGLVL( 10 )) {
983 dbgtext("merge_aces: Masking ACE's\n");
984 print_canon_ace( curr_ace_outer, 0);
985 print_canon_ace( curr_ace, 0);
986 }
987
988 curr_ace->perms &= ~curr_ace_outer->perms;
989
990 if (curr_ace->perms == 0) {
991
992 /*
993 * The deny overrides the allow. Remove the allow.
994 */
995
996 DLIST_REMOVE(l_head, curr_ace);
997 SAFE_FREE(curr_ace);
998 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
999
1000 } else {
1001
1002 /*
1003 * Even after removing permissions, there
1004 * are still allow permissions - delete the deny.
1005 * It is safe to delete the deny here,
1006 * as we are guarenteed by the deny first
1007 * ordering that all the deny entries for
1008 * this SID have already been merged into one
1009 * before we can get to an allow ace.
1010 */
1011
1012 DLIST_REMOVE(l_head, curr_ace_outer);
1013 SAFE_FREE(curr_ace_outer);
1014 break;
1015 }
1016 }
1017
1018 } /* end for curr_ace */
1019 } /* end for curr_ace_outer */
1020
1021 /* We may have modified the list. */
1022
1023 *pp_list_head = l_head;
1024 }
1025
1026 /****************************************************************************
1027 Check if we need to return NT4.x compatible ACL entries.
1028 ****************************************************************************/
1029
1030 bool nt4_compatible_acls(void)
1031 {
1032 int compat = lp_acl_compatibility();
1033
1034 if (compat == ACL_COMPAT_AUTO) {
1035 enum remote_arch_types ra_type = get_remote_arch();
1036
1037 /* Automatically adapt to client */
1038 return (ra_type <= RA_WINNT);
1039 } else
1040 return (compat == ACL_COMPAT_WINNT);
1041 }
1042
1043
1044 /****************************************************************************
1045 Map canon_ace perms to permission bits NT.
1046 The attr element is not used here - we only process deny entries on set,
1047 not get. Deny entries are implicit on get with ace->perms = 0.
1048 ****************************************************************************/
1049
1050 static uint32_t map_canon_ace_perms(int snum,
1051 enum security_ace_type *pacl_type,
1052 mode_t perms,
1053 bool directory_ace)
1054 {
1055 uint32_t nt_mask = 0;
1056
1057 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1058
1059 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1060 if (directory_ace) {
1061 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1062 } else {
1063 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1064 }
1065 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1066 /*
1067 * Windows NT refuses to display ACEs with no permissions in them (but
1068 * they are perfectly legal with Windows 2000). If the ACE has empty
1069 * permissions we cannot use 0, so we use the otherwise unused
1070 * WRITE_OWNER permission, which we ignore when we set an ACL.
1071 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1072 * to be changed in the future.
1073 */
1074
1075 if (nt4_compatible_acls())
1076 nt_mask = UNIX_ACCESS_NONE;
1077 else
1078 nt_mask = 0;
1079 } else {
1080 if (directory_ace) {
1081 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1082 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1083 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1084 } else {
1085 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1086 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1087 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1088 }
1089 }
1090
1091 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1092 (unsigned int)perms, (unsigned int)nt_mask ));
1093
1094 return nt_mask;
1095 }
1096
1097 /****************************************************************************
1098 Map NT perms to a UNIX mode_t.
1099 ****************************************************************************/
1100
1101 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1102 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1103 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1104
1105 static mode_t map_nt_perms( uint32 *mask, int type)
1106 {
1107 mode_t mode = 0;
1108
1109 switch(type) {
1110 case S_IRUSR:
1111 if((*mask) & GENERIC_ALL_ACCESS)
1112 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1113 else {
1114 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1115 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1116 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1117 }
1118 break;
1119 case S_IRGRP:
1120 if((*mask) & GENERIC_ALL_ACCESS)
1121 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1122 else {
1123 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1124 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1125 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1126 }
1127 break;
1128 case S_IROTH:
1129 if((*mask) & GENERIC_ALL_ACCESS)
1130 mode = S_IROTH|S_IWOTH|S_IXOTH;
1131 else {
1132 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1133 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1134 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1135 }
1136 break;
1137 }
1138
1139 return mode;
1140 }
1141
1142 /****************************************************************************
1143 Unpack a SEC_DESC into a UNIX owner and group.
1144 ****************************************************************************/
1145
1146 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1147 {
1148 DOM_SID owner_sid;
1149 DOM_SID grp_sid;
1150
1151 *puser = (uid_t)-1;
1152 *pgrp = (gid_t)-1;
1153
1154 if(security_info_sent == 0) {
1155 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1156 return NT_STATUS_OK;
1157 }
1158
1159 /*
1160 * Validate the owner and group SID's.
1161 */
1162
1163 memset(&owner_sid, '\0', sizeof(owner_sid));
1164 memset(&grp_sid, '\0', sizeof(grp_sid));
1165
1166 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1167
1168 /*
1169 * Don't immediately fail if the owner sid cannot be validated.
1170 * This may be a group chown only set.
1171 */
1172
1173 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1174 sid_copy(&owner_sid, psd->owner_sid);
1175 if (!sid_to_uid(&owner_sid, puser)) {
1176 if (lp_force_unknown_acl_user(snum)) {
1177 /* this allows take ownership to work
1178 * reasonably */
1179 *puser = current_user.ut.uid;
1180 } else {
1181 DEBUG(3,("unpack_nt_owners: unable to validate"
1182 " owner sid for %s\n",
1183 sid_string_dbg(&owner_sid)));
1184 return NT_STATUS_INVALID_OWNER;
1185 }
1186 }
1187 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1188 (unsigned int)*puser ));
1189 }
1190
1191 /*
1192 * Don't immediately fail if the group sid cannot be validated.
1193 * This may be an owner chown only set.
1194 */
1195
1196 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1197 sid_copy(&grp_sid, psd->group_sid);
1198 if (!sid_to_gid( &grp_sid, pgrp)) {
1199 if (lp_force_unknown_acl_user(snum)) {
1200 /* this allows take group ownership to work
1201 * reasonably */
1202 *pgrp = current_user.ut.gid;
1203 } else {
1204 DEBUG(3,("unpack_nt_owners: unable to validate"
1205 " group sid.\n"));
1206 return NT_STATUS_INVALID_OWNER;
1207 }
1208 }
1209 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1210 (unsigned int)*pgrp));
1211 }
1212
1213 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1214
1215 return NT_STATUS_OK;
1216 }
1217
1218 /****************************************************************************
1219 Ensure the enforced permissions for this share apply.
1220 ****************************************************************************/
1221
1222 static void apply_default_perms(const struct share_params *params,
1223 const bool is_directory, canon_ace *pace,
1224 mode_t type)
1225 {
1226 mode_t and_bits = (mode_t)0;
1227 mode_t or_bits = (mode_t)0;
1228
1229 /* Get the initial bits to apply. */
1230
1231 if (is_directory) {
1232 and_bits = lp_dir_security_mask(params->service);
1233 or_bits = lp_force_dir_security_mode(params->service);
1234 } else {
1235 and_bits = lp_security_mask(params->service);
1236 or_bits = lp_force_security_mode(params->service);
1237 }
1238
1239 /* Now bounce them into the S_USR space. */
1240 switch(type) {
1241 case S_IRUSR:
1242 /* Ensure owner has read access. */
1243 pace->perms |= S_IRUSR;
1244 if (is_directory)
1245 pace->perms |= (S_IWUSR|S_IXUSR);
1246 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1247 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1248 break;
1249 case S_IRGRP:
1250 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1251 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1252 break;
1253 case S_IROTH:
1254 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1255 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1256 break;
1257 }
1258
1259 pace->perms = ((pace->perms & and_bits)|or_bits);
1260 }
1261
1262 /****************************************************************************
1263 Check if a given uid/SID is in a group gid/SID. This is probably very
1264 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1265 ****************************************************************************/
1266
1267 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1268 {
1269 const char *u_name = NULL;
1270
1271 /* "Everyone" always matches every uid. */
1272
1273 if (sid_equal(&group_ace->trustee, &global_sid_World))
1274 return True;
1275
1276 /*
1277 * if it's the current user, we already have the unix token
1278 * and don't need to do the complex user_in_group_sid() call
1279 */
1280 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1281 size_t i;
1282
1283 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1284 return True;
1285 }
1286
1287 for (i=0; i < current_user.ut.ngroups; i++) {
1288 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1289 return True;
1290 }
1291 }
1292 }
1293
1294 /* u_name talloc'ed off tos. */
1295 u_name = uidtoname(uid_ace->unix_ug.uid);
1296 if (!u_name) {
1297 return False;
1298 }
1299
1300 /*
1301 * user_in_group_sid() uses create_token_from_username()
1302 * which creates an artificial NT token given just a username,
1303 * so this is not reliable for users from foreign domains
1304 * exported by winbindd!
1305 */
1306 return user_in_group_sid(u_name, &group_ace->trustee);
1307 }
1308
1309 /****************************************************************************
1310 A well formed POSIX file or default ACL has at least 3 entries, a
1311 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1312 In addition, the owner must always have at least read access.
1313 When using this call on get_acl, the pst struct is valid and contains
1314 the mode of the file. When using this call on set_acl, the pst struct has
1315 been modified to have a mode containing the default for this file or directory
1316 type.
1317 ****************************************************************************/
1318
1319 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1320 const struct share_params *params,
1321 const bool is_directory,
1322 const DOM_SID *pfile_owner_sid,
1323 const DOM_SID *pfile_grp_sid,
1324 const SMB_STRUCT_STAT *pst,
1325 bool setting_acl)
1326 {
1327 canon_ace *pace;
1328 bool got_user = False;
1329 bool got_grp = False;
1330 bool got_other = False;
1331 canon_ace *pace_other = NULL;
1332
1333 for (pace = *pp_ace; pace; pace = pace->next) {
1334 if (pace->type == SMB_ACL_USER_OBJ) {
1335
1336 if (setting_acl)
1337 apply_default_perms(params, is_directory, pace, S_IRUSR);
1338 got_user = True;
1339
1340 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1341
1342 /*
1343 * Ensure create mask/force create mode is respected on set.
1344 */
1345
1346 if (setting_acl)
1347 apply_default_perms(params, is_directory, pace, S_IRGRP);
1348 got_grp = True;
1349
1350 } else if (pace->type == SMB_ACL_OTHER) {
1351
1352 /*
1353 * Ensure create mask/force create mode is respected on set.
1354 */
1355
1356 if (setting_acl)
1357 apply_default_perms(params, is_directory, pace, S_IROTH);
1358 got_other = True;
1359 pace_other = pace;
1360 }
1361 }
1362
1363 if (!got_user) {
1364 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1365 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1366 return False;
1367 }
1368
1369 ZERO_STRUCTP(pace);
1370 pace->type = SMB_ACL_USER_OBJ;
1371 pace->owner_type = UID_ACE;
1372 pace->unix_ug.uid = pst->st_uid;
1373 pace->trustee = *pfile_owner_sid;
1374 pace->attr = ALLOW_ACE;
1375
1376 if (setting_acl) {
1377 /* See if the owning user is in any of the other groups in
1378 the ACE. If so, OR in the permissions from that group. */
1379
1380 bool group_matched = False;
1381 canon_ace *pace_iter;
1382
1383 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1384 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1385 if (uid_entry_in_group(pace, pace_iter)) {
1386 pace->perms |= pace_iter->perms;
1387 group_matched = True;
1388 }
1389 }
1390 }
1391
1392 /* If we only got an "everyone" perm, just use that. */
1393 if (!group_matched) {
1394 if (got_other)
1395 pace->perms = pace_other->perms;
1396 else
1397 pace->perms = 0;
1398 }
1399
1400 apply_default_perms(params, is_directory, pace, S_IRUSR);
1401 } else {
1402 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1403 }
1404
1405 DLIST_ADD(*pp_ace, pace);
1406 }
1407
1408 if (!got_grp) {
1409 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1410 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1411 return False;
1412 }
1413
1414 ZERO_STRUCTP(pace);
1415 pace->type = SMB_ACL_GROUP_OBJ;
1416 pace->owner_type = GID_ACE;
1417 pace->unix_ug.uid = pst->st_gid;
1418 pace->trustee = *pfile_grp_sid;
1419 pace->attr = ALLOW_ACE;
1420 if (setting_acl) {
1421 /* If we only got an "everyone" perm, just use that. */
1422 if (got_other)
1423 pace->perms = pace_other->perms;
1424 else
1425 pace->perms = 0;
1426 apply_default_perms(params, is_directory, pace, S_IRGRP);
1427 } else {
1428 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1429 }
1430
1431 DLIST_ADD(*pp_ace, pace);
1432 }
1433
1434 if (!got_other) {
1435 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1436 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1437 return False;
1438 }
1439
1440 ZERO_STRUCTP(pace);
1441 pace->type = SMB_ACL_OTHER;
1442 pace->owner_type = WORLD_ACE;
1443 pace->unix_ug.world = -1;
1444 pace->trustee = global_sid_World;
1445 pace->attr = ALLOW_ACE;
1446 if (setting_acl) {
1447 pace->perms = 0;
1448 apply_default_perms(params, is_directory, pace, S_IROTH);
1449 } else
1450 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1451
1452 DLIST_ADD(*pp_ace, pace);
1453 }
1454
1455 return True;
1456 }
1457
1458 /****************************************************************************
1459 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1460 If it does not have them, check if there are any entries where the trustee is the
1461 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1462 ****************************************************************************/
1463
1464 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1465 {
1466 bool got_user_obj, got_group_obj;
1467 canon_ace *current_ace;
1468 int i, entries;
1469
1470 entries = count_canon_ace_list(ace);
1471 got_user_obj = False;
1472 got_group_obj = False;
1473
1474 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1475 if (current_ace->type == SMB_ACL_USER_OBJ)
1476 got_user_obj = True;
1477 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1478 got_group_obj = True;
1479 }
1480 if (got_user_obj && got_group_obj) {
1481 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1482 return;
1483 }
1484
1485 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1486 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1487 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1488 current_ace->type = SMB_ACL_USER_OBJ;
1489 got_user_obj = True;
1490 }
1491 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1492 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1493 current_ace->type = SMB_ACL_GROUP_OBJ;
1494 got_group_obj = True;
1495 }
1496 }
1497 if (!got_user_obj)
1498 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1499 if (!got_group_obj)
1500 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1501 }
1502
1503 /****************************************************************************
1504 Unpack a SEC_DESC into two canonical ace lists.
1505 ****************************************************************************/
1506
1507 static bool create_canon_ace_lists(files_struct *fsp,
1508 SMB_STRUCT_STAT *pst,
1509 DOM_SID *pfile_owner_sid,
1510 DOM_SID *pfile_grp_sid,
1511 canon_ace **ppfile_ace,
1512 canon_ace **ppdir_ace,
1513 const SEC_ACL *dacl)
1514 {
1515 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1516 canon_ace *file_ace = NULL;
1517 canon_ace *dir_ace = NULL;
1518 canon_ace *current_ace = NULL;
1519 bool got_dir_allow = False;
1520 bool got_file_allow = False;
1521 int i, j;
1522
1523 *ppfile_ace = NULL;
1524 *ppdir_ace = NULL;
1525
1526 /*
1527 * Convert the incoming ACL into a more regular form.
1528 */
1529
1530 for(i = 0; i < dacl->num_aces; i++) {
1531 SEC_ACE *psa = &dacl->aces[i];
1532
1533 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1534 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1535 return False;
1536 }
1537
1538 if (nt4_compatible_acls()) {
1539 /*
1540 * The security mask may be UNIX_ACCESS_NONE which should map into
1541 * no permissions (we overload the WRITE_OWNER bit for this) or it
1542 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1543 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1544 */
1545
1546 /*
1547 * Convert GENERIC bits to specific bits.
1548 */
1549
1550 se_map_generic(&psa->access_mask, &file_generic_mapping);
1551
1552 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1553
1554 if(psa->access_mask != UNIX_ACCESS_NONE)
1555 psa->access_mask &= ~UNIX_ACCESS_NONE;
1556 }
1557 }
1558
1559 /*
1560 * Deal with the fact that NT 4.x re-writes the canonical format
1561 * that we return for default ACLs. If a directory ACE is identical
1562 * to a inherited directory ACE then NT changes the bits so that the
1563 * first ACE is set to OI|IO and the second ACE for this SID is set
1564 * to CI. We need to repair this. JRA.
1565 */
1566
1567 for(i = 0; i < dacl->num_aces; i++) {
1568 SEC_ACE *psa1 = &dacl->aces[i];
1569
1570 for (j = i + 1; j < dacl->num_aces; j++) {
1571 SEC_ACE *psa2 = &dacl->aces[j];
1572
1573 if (psa1->access_mask != psa2->access_mask)
1574 continue;
1575
1576 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1577 continue;
1578
1579 /*
1580 * Ok - permission bits and SIDs are equal.
1581 * Check if flags were re-written.
1582 */
1583
1584 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1585
1586 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1587 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1588
1589 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1590
1591 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1592 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1593
1594 }
1595 }
1596 }
1597
1598 for(i = 0; i < dacl->num_aces; i++) {
1599 SEC_ACE *psa = &dacl->aces[i];
1600
1601 /*
1602 * Create a cannon_ace entry representing this NT DACL ACE.
1603 */
1604
1605 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1606 free_canon_ace_list(file_ace);
1607 free_canon_ace_list(dir_ace);
1608 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1609 return False;
1610 }
1611
1612 ZERO_STRUCTP(current_ace);
1613
1614 sid_copy(&current_ace->trustee, &psa->trustee);
1615
1616 /*
1617 * Try and work out if the SID is a user or group
1618 * as we need to flag these differently for POSIX.
1619 * Note what kind of a POSIX ACL this should map to.
1620 */
1621
1622 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1623 current_ace->owner_type = WORLD_ACE;
1624 current_ace->unix_ug.world = -1;
1625 current_ace->type = SMB_ACL_OTHER;
1626 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1627 current_ace->owner_type = UID_ACE;
1628 current_ace->unix_ug.uid = pst->st_uid;
1629 current_ace->type = SMB_ACL_USER_OBJ;
1630
1631 /*
1632 * The Creator Owner entry only specifies inheritable permissions,
1633 * never access permissions. WinNT doesn't always set the ACE to
1634 *INHERIT_ONLY, though.
1635 */
1636
1637 if (nt4_compatible_acls())
1638 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1639 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1640 current_ace->owner_type = GID_ACE;
1641 current_ace->unix_ug.gid = pst->st_gid;
1642 current_ace->type = SMB_ACL_GROUP_OBJ;
1643
1644 /*
1645 * The Creator Group entry only specifies inheritable permissions,
1646 * never access permissions. WinNT doesn't always set the ACE to
1647 *INHERIT_ONLY, though.
1648 */
1649 if (nt4_compatible_acls())
1650 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1651
1652 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1653 current_ace->owner_type = UID_ACE;
1654 /* If it's the owning user, this is a user_obj, not
1655 * a user. */
1656 if (current_ace->unix_ug.uid == pst->st_uid) {
1657 current_ace->type = SMB_ACL_USER_OBJ;
1658 } else {
1659 current_ace->type = SMB_ACL_USER;
1660 }
1661 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1662 current_ace->owner_type = GID_ACE;
1663 /* If it's the primary group, this is a group_obj, not
1664 * a group. */
1665 if (current_ace->unix_ug.gid == pst->st_gid) {
1666 current_ace->type = SMB_ACL_GROUP_OBJ;
1667 } else {
1668 current_ace->type = SMB_ACL_GROUP;
1669 }
1670 } else {
1671 /*
1672 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1673 */
1674
1675 if (non_mappable_sid(&psa->trustee)) {
1676 DEBUG(10, ("create_canon_ace_lists: ignoring "
1677 "non-mappable SID %s\n",
1678 sid_string_dbg(&psa->trustee)));
1679 SAFE_FREE(current_ace);
1680 continue;
1681 }
1682
1683 free_canon_ace_list(file_ace);
1684 free_canon_ace_list(dir_ace);
1685 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1686 "%s to uid or gid.\n",
1687 sid_string_dbg(&current_ace->trustee)));
1688 SAFE_FREE(current_ace);
1689 return False;
1690 }
1691
1692 /*
1693 * Map the given NT permissions into a UNIX mode_t containing only
1694 * S_I(R|W|X)USR bits.
1695 */
1696
1697 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1698 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1699
1700 /* Store the ace_flag. */
1701 current_ace->ace_flags = psa->flags;
1702
1703 /*
1704 * Now add the created ace to either the file list, the directory
1705 * list, or both. We *MUST* preserve the order here (hence we use
1706 * DLIST_ADD_END) as NT ACLs are order dependent.
1707 */
1708
1709 if (fsp->is_directory) {
1710
1711 /*
1712 * We can only add to the default POSIX ACE list if the ACE is
1713 * designed to be inherited by both files and directories.
1714 */
1715
1716 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1717 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1718
1719 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1720
1721 /*
1722 * Note if this was an allow ace. We can't process
1723 * any further deny ace's after this.
1724 */
1725
1726 if (current_ace->attr == ALLOW_ACE)
1727 got_dir_allow = True;
1728
1729 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1730 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1731 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1732 free_canon_ace_list(file_ace);
1733 free_canon_ace_list(dir_ace);
1734 return False;
1735 }
1736
1737 if( DEBUGLVL( 10 )) {
1738 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1739 print_canon_ace( current_ace, 0);
1740 }
1741
1742 /*
1743 * If this is not an inherit only ACE we need to add a duplicate
1744 * to the file acl.
1745 */
1746
1747 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1748 canon_ace *dup_ace = dup_canon_ace(current_ace);
1749
1750 if (!dup_ace) {
1751 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1752 free_canon_ace_list(file_ace);
1753 free_canon_ace_list(dir_ace);
1754 return False;
1755 }
1756
1757 /*
1758 * We must not free current_ace here as its
1759 * pointer is now owned by the dir_ace list.
1760 */
1761 current_ace = dup_ace;
1762 } else {
1763 /*
1764 * We must not free current_ace here as its
1765 * pointer is now owned by the dir_ace list.
1766 */
1767 current_ace = NULL;
1768 }
1769 }
1770 }
1771
1772 /*
1773 * Only add to the file ACL if not inherit only.
1774 */
1775
1776 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1777 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1778
1779 /*
1780 * Note if this was an allow ace. We can't process
1781 * any further deny ace's after this.
1782 */
1783
1784 if (current_ace->attr == ALLOW_ACE)
1785 got_file_allow = True;
1786
1787 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1788 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1789 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1790 free_canon_ace_list(file_ace);
1791 free_canon_ace_list(dir_ace);
1792 return False;
1793 }
1794
1795 if( DEBUGLVL( 10 )) {
1796 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1797 print_canon_ace( current_ace, 0);
1798 }
1799 all_aces_are_inherit_only = False;
1800 /*
1801 * We must not free current_ace here as its
1802 * pointer is now owned by the file_ace list.
1803 */
1804 current_ace = NULL;
1805 }
1806
1807 /*
1808 * Free if ACE was not added.
1809 */
1810
1811 SAFE_FREE(current_ace);
1812 }
1813
1814 if (fsp->is_directory && all_aces_are_inherit_only) {
1815 /*
1816 * Windows 2000 is doing one of these weird 'inherit acl'
1817 * traverses to conserve NTFS ACL resources. Just pretend
1818 * there was no DACL sent. JRA.
1819 */
1820
1821 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1822 free_canon_ace_list(file_ace);
1823 free_canon_ace_list(dir_ace);
1824 file_ace = NULL;
1825 dir_ace = NULL;
1826 } else {
1827 /*
1828 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1829 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1830 * entries can be converted to *_OBJ. Usually we will already have these
1831 * entries in the Default ACL, and the Access ACL will not have them.
1832 */
1833 if (file_ace) {
1834 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1835 }
1836 if (dir_ace) {
1837 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1838 }
1839 }
1840
1841 *ppfile_ace = file_ace;
1842 *ppdir_ace = dir_ace;
1843
1844 return True;
1845 }
1846
1847 /****************************************************************************
1848 ASCII art time again... JRA :-).
1849
1850 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1851 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1852 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1853 allow or deny have been merged, so the same SID can only appear once in the deny
1854 list or once in the allow list.
1855
1856 We then process as follows :
1857
1858 ---------------------------------------------------------------------------
1859 First pass - look for a Everyone DENY entry.
1860
1861 If it is deny all (rwx) trunate the list at this point.
1862 Else, walk the list from this point and use the deny permissions of this
1863 entry as a mask on all following allow entries. Finally, delete
1864 the Everyone DENY entry (we have applied it to everything possible).
1865
1866 In addition, in this pass we remove any DENY entries that have
1867 no permissions (ie. they are a DENY nothing).
1868 ---------------------------------------------------------------------------
1869 Second pass - only deal with deny user entries.
1870
1871 DENY user1 (perms XXX)
1872
1873 new_perms = 0
1874 for all following allow group entries where user1 is in group
1875 new_perms |= group_perms;
1876
1877 user1 entry perms = new_perms & ~ XXX;
1878
1879 Convert the deny entry to an allow entry with the new perms and
1880 push to the end of the list. Note if the user was in no groups
1881 this maps to a specific allow nothing entry for this user.
1882
1883 The common case from the NT ACL choser (userX deny all) is
1884 optimised so we don't do the group lookup - we just map to
1885 an allow nothing entry.
1886
1887 What we're doing here is inferring the allow permissions the
1888 person setting the ACE on user1 wanted by looking at the allow
1889 permissions on the groups the user is currently in. This will
1890 be a snapshot, depending on group membership but is the best
1891 we can do and has the advantage of failing closed rather than
1892 open.
1893 ---------------------------------------------------------------------------
1894 Third pass - only deal with deny group entries.
1895
1896 DENY group1 (perms XXX)
1897
1898 for all following allow user entries where user is in group1
1899 user entry perms = user entry perms & ~ XXX;
1900
1901 If there is a group Everyone allow entry with permissions YYY,
1902 convert the group1 entry to an allow entry and modify its
1903 permissions to be :
1904
1905 new_perms = YYY & ~ XXX
1906
1907 and push to the end of the list.
1908
1909 If there is no group Everyone allow entry then convert the
1910 group1 entry to a allow nothing entry and push to the end of the list.
1911
1912 Note that the common case from the NT ACL choser (groupX deny all)
1913 cannot be optimised here as we need to modify user entries who are
1914 in the group to change them to a deny all also.
1915
1916 What we're doing here is modifying the allow permissions of
1917 user entries (which are more specific in POSIX ACLs) to mask
1918 out the explicit deny set on the group they are in. This will
1919 be a snapshot depending on current group membership but is the
1920 best we can do and has the advantage of failing closed rather
1921 than open.
1922 ---------------------------------------------------------------------------
1923 Fourth pass - cope with cumulative permissions.
1924
1925 for all allow user entries, if there exists an allow group entry with
1926 more permissive permissions, and the user is in that group, rewrite the
1927 allow user permissions to contain both sets of permissions.
1928
1929 Currently the code for this is #ifdef'ed out as these semantics make
1930 no sense to me. JRA.
1931 ---------------------------------------------------------------------------
1932
1933 Note we *MUST* do the deny user pass first as this will convert deny user
1934 entries into allow user entries which can then be processed by the deny
1935 group pass.
1936
1937 The above algorithm took a *lot* of thinking about - hence this
1938 explaination :-). JRA.
1939 ****************************************************************************/
1940
1941 /****************************************************************************
1942 Process a canon_ace list entries. This is very complex code. We need
1943 to go through and remove the "deny" permissions from any allow entry that matches
1944 the id of this entry. We have already refused any NT ACL that wasn't in correct
1945 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1946 we just remove it (to fail safe). We have already removed any duplicate ace
1947 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1948 allow entries.
1949 ****************************************************************************/
1950
1951 static void process_deny_list( canon_ace **pp_ace_list )
1952 {
1953 canon_ace *ace_list = *pp_ace_list;
1954 canon_ace *curr_ace = NULL;
1955 canon_ace *curr_ace_next = NULL;
1956
1957 /* Pass 1 above - look for an Everyone, deny entry. */
1958
1959 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1960 canon_ace *allow_ace_p;
1961
1962 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1963
1964 if (curr_ace->attr != DENY_ACE)
1965 continue;
1966
1967 if (curr_ace->perms == (mode_t)0) {
1968
1969 /* Deny nothing entry - delete. */
1970
1971 DLIST_REMOVE(ace_list, curr_ace);
1972 continue;
1973 }
1974
1975 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1976 continue;
1977
1978 /* JRATEST - assert. */
1979 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1980
1981 if (curr_ace->perms == ALL_ACE_PERMS) {
1982
1983 /*
1984 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1985 * list at this point including this entry.
1986 */
1987
1988 canon_ace *prev_entry = curr_ace->prev;
1989
1990 free_canon_ace_list( curr_ace );
1991 if (prev_entry)
1992 prev_entry->next = NULL;
1993 else {
1994 /* We deleted the entire list. */
1995 ace_list = NULL;
1996 }
1997 break;
1998 }
1999
2000 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2001
2002 /*
2003 * Only mask off allow entries.
2004 */
2005
2006 if (allow_ace_p->attr != ALLOW_ACE)
2007 continue;
2008
2009 allow_ace_p->perms &= ~curr_ace->perms;
2010 }
2011
2012 /*
2013 * Now it's been applied, remove it.
2014 */
2015
2016 DLIST_REMOVE(ace_list, curr_ace);
2017 }
2018
2019 /* Pass 2 above - deal with deny user entries. */
2020
2021 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2022 mode_t new_perms = (mode_t)0;
2023 canon_ace *allow_ace_p;
2024
2025 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2026
2027 if (curr_ace->attr != DENY_ACE)
2028 continue;
2029
2030 if (curr_ace->owner_type != UID_ACE)
2031 continue;
2032
2033 if (curr_ace->perms == ALL_ACE_PERMS) {
2034
2035 /*
2036 * Optimisation - this is a deny everything to this user.
2037 * Convert to an allow nothing and push to the end of the list.
2038 */
2039
2040 curr_ace->attr = ALLOW_ACE;
2041 curr_ace->perms = (mode_t)0;
2042 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2043 continue;
2044 }
2045
2046 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2047
2048 if (allow_ace_p->attr != ALLOW_ACE)
2049 continue;
2050
2051 /* We process GID_ACE and WORLD_ACE entries only. */
2052
2053 if (allow_ace_p->owner_type == UID_ACE)
2054 continue;
2055
2056 if (uid_entry_in_group( curr_ace, allow_ace_p))
2057 new_perms |= allow_ace_p->perms;
2058 }
2059
2060 /*
2061 * Convert to a allow entry, modify the perms and push to the end
2062 * of the list.
2063 */
2064
2065 curr_ace->attr = ALLOW_ACE;
2066 curr_ace->perms = (new_perms & ~curr_ace->perms);
2067 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2068 }
2069
2070 /* Pass 3 above - deal with deny group entries. */
2071
2072 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2073 canon_ace *allow_ace_p;
2074 canon_ace *allow_everyone_p = NULL;
2075
2076 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2077
2078 if (curr_ace->attr != DENY_ACE)
2079 continue;
2080
2081 if (curr_ace->owner_type != GID_ACE)
2082 continue;
2083
2084 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2085
2086 if (allow_ace_p->attr != ALLOW_ACE)
2087 continue;
2088
2089 /* Store a pointer to the Everyone allow, if it exists. */
2090 if (allow_ace_p->owner_type == WORLD_ACE)
2091 allow_everyone_p = allow_ace_p;
2092
2093 /* We process UID_ACE entries only. */
2094
2095 if (allow_ace_p->owner_type != UID_ACE)
2096 continue;
2097
2098 /* Mask off the deny group perms. */
2099
2100 if (uid_entry_in_group( allow_ace_p, curr_ace))
2101 allow_ace_p->perms &= ~curr_ace->perms;
2102 }
2103
2104 /*
2105 * Convert the deny to an allow with the correct perms and
2106 * push to the end of the list.
2107 */
2108
2109 curr_ace->attr = ALLOW_ACE;
2110 if (allow_everyone_p)
2111 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2112 else
2113 curr_ace->perms = (mode_t)0;
2114 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2115 }
2116
2117 /* Doing this fourth pass allows Windows semantics to be layered
2118 * on top of POSIX semantics. I'm not sure if this is desirable.
2119 * For example, in W2K ACLs there is no way to say, "Group X no
2120 * access, user Y full access" if user Y is a member of group X.
2121 * This seems completely broken semantics to me.... JRA.
2122 */
2123
2124 #if 0
2125 /* Pass 4 above - deal with allow entries. */
2126
2127 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2128 canon_ace *allow_ace_p;
2129
2130 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2131
2132 if (curr_ace->attr != ALLOW_ACE)
2133 continue;
2134
2135 if (curr_ace->owner_type != UID_ACE)
2136 continue;
2137
2138 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2139
2140 if (allow_ace_p->attr != ALLOW_ACE)
2141 continue;
2142
2143 /* We process GID_ACE entries only. */
2144
2145 if (allow_ace_p->owner_type != GID_ACE)
2146 continue;
2147
2148 /* OR in the group perms. */
2149
2150 if (uid_entry_in_group( curr_ace, allow_ace_p))
2151 curr_ace->perms |= allow_ace_p->perms;
2152 }
2153 }
2154 #endif
2155
2156 *pp_ace_list = ace_list;
2157 }
2158
2159 /****************************************************************************
2160 Create a default mode that will be used if a security descriptor entry has
2161 no user/group/world entries.
2162 ****************************************************************************/
2163
2164 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2165 {
2166 int snum = SNUM(fsp->conn);
2167 mode_t and_bits = (mode_t)0;
2168 mode_t or_bits = (mode_t)0;
2169 mode_t mode = interitable_mode
2170 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
2171 NULL )
2172 : S_IRUSR;
2173
2174 if (fsp->is_directory)
2175 mode |= (S_IWUSR|S_IXUSR);
2176
2177 /*
2178 * Now AND with the create mode/directory mode bits then OR with the
2179 * force create mode/force directory mode bits.
2180 */
2181
2182 if (fsp->is_directory) {
2183 and_bits = lp_dir_security_mask(snum);
2184 or_bits = lp_force_dir_security_mode(snum);
2185 } else {
2186 and_bits = lp_security_mask(snum);
2187 or_bits = lp_force_security_mode(snum);
2188 }
2189
2190 return ((mode & and_bits)|or_bits);
2191 }
2192
2193 /****************************************************************************
2194 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2195 succeeding.
2196 ****************************************************************************/
2197
2198 static bool unpack_canon_ace(files_struct *fsp,
2199 SMB_STRUCT_STAT *pst,
2200 DOM_SID *pfile_owner_sid,
2201 DOM_SID *pfile_grp_sid,
2202 canon_ace **ppfile_ace,
2203 canon_ace **ppdir_ace,
2204 uint32 security_info_sent,
2205 const SEC_DESC *psd)
2206 {
2207 canon_ace *file_ace = NULL;
2208 canon_ace *dir_ace = NULL;
2209
2210 *ppfile_ace = NULL;
2211 *ppdir_ace = NULL;
2212
2213 if(security_info_sent == 0) {
2214 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2215 return False;
2216 }
2217
2218 /*
2219 * If no DACL then this is a chown only security descriptor.
2220 */
2221
2222 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2223 return True;
2224
2225 /*
2226 * Now go through the DACL and create the canon_ace lists.
2227 */
2228
2229 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2230 &file_ace, &dir_ace, psd->dacl))
2231 return False;
2232
2233 if ((file_ace == NULL) && (dir_ace == NULL)) {
2234 /* W2K traverse DACL set - ignore. */
2235 return True;
2236 }
2237
2238 /*
2239 * Go through the canon_ace list and merge entries
2240 * belonging to identical users of identical allow or deny type.
2241 * We can do this as all deny entries come first, followed by
2242 * all allow entries (we have mandated this before accepting this acl).
2243 */
2244
2245 print_canon_ace_list( "file ace - before merge", file_ace);
2246 merge_aces( &file_ace );
2247
2248 print_canon_ace_list( "dir ace - before merge", dir_ace);
2249 merge_aces( &dir_ace );
2250
2251 /*
2252 * NT ACLs are order dependent. Go through the acl lists and
2253 * process DENY entries by masking the allow entries.
2254 */
2255
2256 print_canon_ace_list( "file ace - before deny", file_ace);
2257 process_deny_list( &file_ace);
2258
2259 print_canon_ace_list( "dir ace - before deny", dir_ace);
2260 process_deny_list( &dir_ace);
2261
2262 /*
2263 * A well formed POSIX file or default ACL has at least 3 entries, a
2264 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2265 * and optionally a mask entry. Ensure this is the case.
2266 */
2267
2268 print_canon_ace_list( "file ace - before valid", file_ace);
2269
2270 /*
2271 * A default 3 element mode entry for a file should be r-- --- ---.
2272 * A default 3 element mode entry for a directory should be rwx --- ---.
2273 */
2274
2275 pst->st_mode = create_default_mode(fsp, False);
2276
2277 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2278 free_canon_ace_list(file_ace);
2279 free_canon_ace_list(dir_ace);
2280 return False;
2281 }
2282
2283 print_canon_ace_list( "dir ace - before valid", dir_ace);
2284
2285 /*
2286 * A default inheritable 3 element mode entry for a directory should be the
2287 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2288 * it's a directory.
2289 */
2290
2291 pst->st_mode = create_default_mode(fsp, True);
2292
2293 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2294 free_canon_ace_list(file_ace);
2295 free_canon_ace_list(dir_ace);
2296 return False;
2297 }
2298
2299 print_canon_ace_list( "file ace - return", file_ace);
2300 print_canon_ace_list( "dir ace - return", dir_ace);
2301
2302 *ppfile_ace = file_ace;
2303 *ppdir_ace = dir_ace;
2304 return True;
2305
2306 }
2307
2308 /******************************************************************************
2309 When returning permissions, try and fit NT display
2310 semantics if possible. Note the the canon_entries here must have been malloced.
2311 The list format should be - first entry = owner, followed by group and other user
2312 entries, last entry = other.
2313
2314 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2315 are not ordered, and match on the most specific entry rather than walking a list,
2316 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2317
2318 Entry 0: owner : deny all except read and write.
2319 Entry 1: owner : allow read and write.
2320 Entry 2: group : deny all except read.
2321 Entry 3: group : allow read.
2322 Entry 4: Everyone : allow read.
2323
2324 But NT cannot display this in their ACL editor !
2325 ********************************************************************************/
2326
2327 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2328 {
2329 canon_ace *l_head = *pp_list_head;
2330 canon_ace *owner_ace = NULL;
2331 canon_ace *other_ace = NULL;
2332 canon_ace *ace = NULL;
2333
2334 for (ace = l_head; ace; ace = ace->next) {
2335 if (ace->type == SMB_ACL_USER_OBJ)
2336 owner_ace = ace;
2337 else if (ace->type == SMB_ACL_OTHER) {
2338 /* Last ace - this is "other" */
2339 other_ace = ace;
2340 }
2341 }
2342
2343 if (!owner_ace || !other_ace) {
2344 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2345 filename ));
2346 return;
2347 }
2348
2349 /*
2350 * The POSIX algorithm applies to owner first, and other last,
2351 * so ensure they are arranged in this order.
2352 */
2353
2354 if (owner_ace) {
2355 DLIST_PROMOTE(l_head, owner_ace);
2356 }
2357
2358 if (other_ace) {
2359 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2360 }
2361
2362 /* We have probably changed the head of the list. */
2363
2364 *pp_list_head = l_head;
2365 }
2366
2367 /****************************************************************************
2368 Create a linked list of canonical ACE entries.
2369 ****************************************************************************/
2370
2371 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2372 const char *fname, SMB_ACL_T posix_acl,
2373 const SMB_STRUCT_STAT *psbuf,
2374 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2375 {
2376 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2377 canon_ace *l_head = NULL;
2378 canon_ace *ace = NULL;
2379 canon_ace *next_ace = NULL;
2380 int entry_id = SMB_ACL_FIRST_ENTRY;
2381 SMB_ACL_ENTRY_T entry;
2382 size_t ace_count;
2383
2384 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2385 SMB_ACL_TAG_T tagtype;
2386 SMB_ACL_PERMSET_T permset;
2387 DOM_SID sid;
2388 posix_id unix_ug;
2389 enum ace_owner owner_type;
2390
2391 entry_id = SMB_ACL_NEXT_ENTRY;
2392
2393 /* Is this a MASK entry ? */
2394 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2395 continue;
2396
2397 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2398 continue;
2399
2400 /* Decide which SID to use based on the ACL type. */
2401 switch(tagtype) {
2402 case SMB_ACL_USER_OBJ:
2403 /* Get the SID from the owner. */
2404 sid_copy(&sid, powner);
2405 unix_ug.uid = psbuf->st_uid;
2406 owner_type = UID_ACE;
2407 break;
2408 case SMB_ACL_USER:
2409 {
2410 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2411 if (puid == NULL) {
2412 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2413 continue;
2414 }
2415 /*
2416 * A SMB_ACL_USER entry for the owner is shadowed by the
2417 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2418 * that entry, so we ignore it. We also don't create such
2419 * entries out of the blue when setting ACLs, so a get/set
2420 * cycle will drop them.
2421 */
2422 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2423 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2424 continue;
2425 }
2426 uid_to_sid( &sid, *puid);
2427 unix_ug.uid = *puid;
2428 owner_type = UID_ACE;
2429 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2430 break;
2431 }
2432 case SMB_ACL_GROUP_OBJ:
2433 /* Get the SID from the owning group. */
2434 sid_copy(&sid, pgroup);
2435 unix_ug.gid = psbuf->st_gid;
2436 owner_type = GID_ACE;
2437 break;
2438 case SMB_ACL_GROUP:
2439 {
2440 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2441 if (pgid == NULL) {
2442 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2443 continue;
2444 }
2445 gid_to_sid( &sid, *pgid);
2446 unix_ug.gid = *pgid;
2447 owner_type = GID_ACE;
2448 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2449 break;
2450 }
2451 case SMB_ACL_MASK:
2452 acl_mask = convert_permset_to_mode_t(conn, permset);
2453 continue; /* Don't count the mask as an entry. */
2454 case SMB_ACL_OTHER:
2455 /* Use the Everyone SID */
2456 sid = global_sid_World;
2457 unix_ug.world = -1;
2458 owner_type = WORLD_ACE;
2459 break;
2460 default:
2461 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2462 continue;
2463 }
2464
2465 /*
2466 * Add this entry to the list.
2467 */
2468
2469 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2470 goto fail;
2471
2472 ZERO_STRUCTP(ace);
2473 ace->type = tagtype;
2474 ace->perms = convert_permset_to_mode_t(conn, permset);
2475 ace->attr = ALLOW_ACE;
2476 ace->trustee = sid;
2477 ace->unix_ug = unix_ug;
2478 ace->owner_type = owner_type;
2479 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2480
2481 DLIST_ADD(l_head, ace);
2482 }
2483
2484 /*
2485 * This next call will ensure we have at least a user/group/world set.
2486 */
2487
2488 if (!ensure_canon_entry_valid(&l_head, conn->params,
2489 S_ISDIR(psbuf->st_mode), powner, pgroup,
2490 psbuf, False))
2491 goto fail;
2492
2493 /*
2494 * Now go through the list, masking the permissions with the
2495 * acl_mask. Ensure all DENY Entries are at the start of the list.
2496 */
2497
2498 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2499
2500 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2501 next_ace = ace->next;
2502
2503 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2504 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2505 ace->perms &= acl_mask;
2506
2507 if (ace->perms == 0) {
2508 DLIST_PROMOTE(l_head, ace);
2509 }
2510
2511 if( DEBUGLVL( 10 ) ) {
2512 print_canon_ace(ace, ace_count);
2513 }
2514 }
2515
2516 arrange_posix_perms(fname,&l_head );
2517
2518 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2519
2520 return l_head;
2521
2522 fail:
2523
2524 free_canon_ace_list(l_head);
2525 return NULL;
2526 }
2527
2528 /****************************************************************************
2529 Check if the current user group list contains a given group.
2530 ****************************************************************************/
2531
2532 static bool current_user_in_group(gid_t gid)
2533 {
2534 int i;
2535
2536 for (i = 0; i < current_user.ut.ngroups; i++) {
2537 if (current_user.ut.groups[i] == gid) {
2538 return True;
2539 }
2540 }
2541
2542 return False;
2543 }
2544
2545 /****************************************************************************
2546 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2547 ****************************************************************************/
2548
2549 static bool acl_group_override(connection_struct *conn,
2550 gid_t prim_gid,
2551 const char *fname)
2552 {
2553 SMB_STRUCT_STAT sbuf;
2554
2555 if ((errno != EPERM) && (errno != EACCES)) {
2556 return false;
2557 }
2558
2559 /* file primary group == user primary or supplementary group */
2560 if (lp_acl_group_control(SNUM(conn)) &&
2561 current_user_in_group(prim_gid)) {
2562 return true;
2563 }
2564
2565 /* user has writeable permission */
2566 if (lp_dos_filemode(SNUM(conn)) &&
2567 can_write_to_file(conn, fname, &sbuf)) {
2568 return true;
2569 }
2570
2571 return false;
2572 }
2573
2574 /****************************************************************************
2575 Attempt to apply an ACL to a file or directory.
2576 ****************************************************************************/
2577
2578 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2579 {
2580 connection_struct *conn = fsp->conn;
2581 bool ret = False;
2582 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2583 canon_ace *p_ace;
2584 int i;
2585 SMB_ACL_ENTRY_T mask_entry;
2586 bool got_mask_entry = False;
2587 SMB_ACL_PERMSET_T mask_permset;
2588 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2589 bool needs_mask = False;
2590 mode_t mask_perms = 0;
2591
2592 #if defined(POSIX_ACL_NEEDS_MASK)
2593 /* HP-UX always wants to have a mask (called "class" there). */
2594 needs_mask = True;
2595 #endif
2596
2597 if (the_acl == NULL) {
2598
2599 if (!no_acl_syscall_error(errno)) {
2600 /*
2601 * Only print this error message if we have some kind of ACL
2602 * support that's not working. Otherwise we would always get this.
2603 */
2604 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2605 default_ace ? "default" : "file", strerror(errno) ));
2606 }
2607 *pacl_set_support = False;
2608 return False;
2609 }
2610
2611 if( DEBUGLVL( 10 )) {
2612 dbgtext("set_canon_ace_list: setting ACL:\n");
2613 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2614 print_canon_ace( p_ace, i);
2615 }
2616 }
2617
2618 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2619 SMB_ACL_ENTRY_T the_entry;
2620 SMB_ACL_PERMSET_T the_permset;
2621
2622 /*
2623 * ACLs only "need" an ACL_MASK entry if there are any named user or
2624 * named group entries. But if there is an ACL_MASK entry, it applies
2625 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2626 * so that it doesn't deny (i.e., mask off) any permissions.
2627 */
2628
2629 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2630 needs_mask = True;
2631 mask_perms |= p_ace->perms;
2632 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2633 mask_perms |= p_ace->perms;
2634 }
2635
2636 /*
2637 * Get the entry for this ACE.
2638 */
2639
2640 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2641 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2642 i, strerror(errno) ));
2643 goto fail;
2644 }
2645
2646 if (p_ace->type == SMB_ACL_MASK) {
2647 mask_entry = the_entry;
2648 got_mask_entry = True;
2649 }
2650
2651 /*
2652 * Ok - we now know the ACL calls should be working, don't
2653 * allow fallback to chmod.
2654 */
2655
2656 *pacl_set_support = True;
2657
2658 /*
2659 * Initialise the entry from the canon_ace.
2660 */
2661
2662 /*
2663 * First tell the entry what type of ACE this is.
2664 */
2665
2666 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2667 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2668 i, strerror(errno) ));
2669 goto fail;
2670 }
2671
2672 /*
2673 * Only set the qualifier (user or group id) if the entry is a user
2674 * or group id ACE.
2675 */
2676
2677 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2678 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2679 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2680 i, strerror(errno) ));
2681 goto fail;
2682 }
2683 }
2684
2685 /*
2686 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2687 */
2688
2689 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2690 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2691 i, strerror(errno) ));
2692 goto fail;
2693 }
2694
2695 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2696 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2697 (unsigned int)p_ace->perms, i, strerror(errno) ));
2698 goto fail;
2699 }
2700
2701 /*
2702 * ..and apply them to the entry.
2703 */
2704
2705 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2706 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2707 i, strerror(errno) ));
2708 goto fail;
2709 }
2710
2711 if( DEBUGLVL( 10 ))
2712 print_canon_ace( p_ace, i);
2713
2714 }
2715
2716 if (needs_mask && !got_mask_entry) {
2717 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2718 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2719 goto fail;
2720 }
2721
2722 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2723 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2724 goto fail;
2725 }
2726
2727 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2728 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2729 goto fail;
2730 }
2731
2732 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2733 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2734 goto fail;
2735 }
2736
2737 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2738 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2739 goto fail;
2740 }
2741 }
2742
2743 /*
2744 * Finally apply it to the file or directory.
2745 */
2746
2747 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2748 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2749 /*
2750 * Some systems allow all the above calls and only fail with no ACL support
2751 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2752 */
2753 if (no_acl_syscall_error(errno)) {
2754 *pacl_set_support = False;
2755 }
2756
2757 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2758 int sret;
2759
2760 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2761 fsp->fsp_name ));
2762
2763 become_root();
2764 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2765 unbecome_root();
2766 if (sret == 0) {
2767 ret = True;
2768 }
2769 }
2770
2771 if (ret == False) {
2772 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2773 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2774 fsp->fsp_name, strerror(errno) ));
2775 goto fail;
2776 }
2777 }
2778 } else {
2779 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2780 /*
2781 * Some systems allow all the above calls and only fail with no ACL support
2782 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2783 */
2784 if (no_acl_syscall_error(errno)) {
2785 *pacl_set_support = False;
2786 }
2787
2788 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2789 int sret;
2790
2791 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2792 fsp->fsp_name ));
2793
2794 become_root();
2795 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2796 unbecome_root();
2797 if (sret == 0) {
2798 ret = True;
2799 }
2800 }
2801
2802 if (ret == False) {
2803 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2804 fsp->fsp_name, strerror(errno) ));
2805 goto fail;
2806 }
2807 }
2808 }
2809
2810 ret = True;
2811
2812 fail:
2813
2814 if (the_acl != NULL) {
2815 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2816 }
2817
2818 return ret;
2819 }
2820
2821 /****************************************************************************
2822 Find a particular canon_ace entry.
2823 ****************************************************************************/
2824
2825 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2826 {
2827 while (list) {
2828 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2829 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2830 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2831 break;
2832 list = list->next;
2833 }
2834 return list;
2835 }
2836
2837 /****************************************************************************
2838
2839 ****************************************************************************/
2840
2841 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2842 {
2843 SMB_ACL_ENTRY_T entry;
2844
2845 if (!the_acl)
2846 return NULL;
2847 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2848 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2849 return NULL;
2850 }
2851 return the_acl;
2852 }
2853
2854 /****************************************************************************
2855 Convert a canon_ace to a generic 3 element permission - if possible.
2856 ****************************************************************************/
2857
2858 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2859
2860 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2861 {
2862 int snum = SNUM(fsp->conn);
2863 size_t ace_count = count_canon_ace_list(file_ace_list);
2864 canon_ace *ace_p;
2865 canon_ace *owner_ace = NULL;
2866 canon_ace *group_ace = NULL;
2867 canon_ace *other_ace = NULL;
2868 mode_t and_bits;
2869 mode_t or_bits;
2870
2871 if (ace_count != 3) {
2872 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2873 posix perms.\n", fsp->fsp_name ));
2874 return False;
2875 }
2876
2877 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2878 if (ace_p->owner_type == UID_ACE)
2879 owner_ace = ace_p;
2880 else if (ace_p->owner_type == GID_ACE)
2881 group_ace = ace_p;
2882 else if (ace_p->owner_type == WORLD_ACE)
2883 other_ace = ace_p;
2884 }
2885
2886 if (!owner_ace || !group_ace || !other_ace) {
2887 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2888 fsp->fsp_name ));
2889 return False;
2890 }
2891
2892 *posix_perms = (mode_t)0;
2893
2894 *posix_perms |= owner_ace->perms;
2895 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2896 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2897 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2898 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2899 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2900 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2901
2902 /* The owner must have at least read access. */
2903
2904 *posix_perms |= S_IRUSR;
2905 if (fsp->is_directory)
2906 *posix_perms |= (S_IWUSR|S_IXUSR);
2907
2908 /* If requested apply the masks. */
2909
2910 /* Get the initial bits to apply. */
2911
2912 if (fsp->is_directory) {
2913 and_bits = lp_dir_security_mask(snum);
2914 or_bits = lp_force_dir_security_mode(snum);
2915 } else {
2916 and_bits = lp_security_mask(snum);
2917 or_bits = lp_force_security_mode(snum);
2918 }
2919
2920 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2921
2922 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2923 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2924 fsp->fsp_name ));
2925
2926 return True;
2927 }
2928
2929 /****************************************************************************
2930 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2931 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2932 with CI|OI set so it is inherited and also applies to the directory.
2933 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2934 ****************************************************************************/
2935
2936 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2937 {
2938 size_t i, j;
2939
2940 for (i = 0; i < num_aces; i++) {
2941 for (j = i+1; j < num_aces; j++) {
2942 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2943 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2944 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2945 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2946
2947 /* We know the lower number ACE's are file entries. */
2948 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2949 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2950 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2951 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2952 (i_inh == j_inh) &&
2953 (i_flags_ni == 0) &&
2954 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2955 SEC_ACE_FLAG_CONTAINER_INHERIT|
2956 SEC_ACE_FLAG_INHERIT_ONLY))) {
2957 /*
2958 * W2K wants to have access allowed zero access ACE's
2959 * at the end of the list. If the mask is zero, merge
2960 * the non-inherited ACE onto the inherited ACE.
2961 */
2962
2963 if (nt_ace_list[i].access_mask == 0) {
2964 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2965 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2966 if (num_aces - i - 1 > 0)
2967 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2968 sizeof(SEC_ACE));
2969
2970 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2971 (unsigned int)i, (unsigned int)j ));
2972 } else {
2973 /*
2974 * These are identical except for the flags.
2975 * Merge the inherited ACE onto the non-inherited ACE.
2976 */
2977
2978 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2979 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2980 if (num_aces - j - 1 > 0)
2981 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2982 sizeof(SEC_ACE));
2983
2984 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2985 (unsigned int)j, (unsigned int)i ));
2986 }
2987 num_aces--;
2988 break;
2989 }
2990 }
2991 }
2992
2993 return num_aces;
2994 }
2995
2996 /*
2997 * Add or Replace ACE entry.
2998 * In some cases we need to add a specific ACE for compatibility reasons.
2999 * When doing that we must make sure we are not actually creating a duplicate
3000 * entry. So we need to search whether an ACE entry already exist and eventually
3001 * replacce the access mask, or add a completely new entry if none was found.
3002 *
3003 * This function assumes the array has enough space to add a new entry without
3004 * any reallocation of memory.
3005 */
3006
3007 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3008 const DOM_SID *sid, enum security_ace_type type,
3009 uint32_t mask, uint8_t flags)
3010 {
3011 int i;
3012
3013 /* first search for a duplicate */
3014 for (i = 0; i < *num_aces; i++) {
3015 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3016 (nt_ace_list[i].flags == flags)) break;
3017 }
3018
3019 if (i < *num_aces) { /* found */
3020 nt_ace_list[i].type = type;
3021 nt_ace_list[i].access_mask = mask;
3022 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3023 i, sid_string_dbg(sid), flags));
3024 return;
3025 }
3026
3027 /* not found, append it */
3028 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3029 }
3030
3031
3032 /****************************************************************************
3033 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3034 the space for the return elements and returns the size needed to return the
3035 security descriptor. This should be the only external function needed for
3036 the UNIX style get ACL.
3037 ****************************************************************************/
3038
3039 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3040 const char *name,
3041 const SMB_STRUCT_STAT *sbuf,
3042 struct pai_val *pal,
3043 SMB_ACL_T posix_acl,
3044 SMB_ACL_T def_acl,
3045 uint32_t security_info,
3046 SEC_DESC **ppdesc)
3047 {
3048 DOM_SID owner_sid;
3049 DOM_SID group_sid;
3050 size_t sd_size = 0;
3051 SEC_ACL *psa = NULL;
3052 size_t num_acls = 0;
3053 size_t num_def_acls = 0;
3054 size_t num_aces = 0;
3055 canon_ace *file_ace = NULL;
3056 canon_ace *dir_ace = NULL;
3057 SEC_ACE *nt_ace_list = NULL;
3058 size_t num_profile_acls = 0;
3059 DOM_SID orig_owner_sid;
3060 SEC_DESC *psd = NULL;
3061 int i;
3062
3063 /*
3064 * Get the owner, group and world SIDs.
3065 */
3066
3067 create_file_sids(sbuf, &owner_sid, &group_sid);
3068
3069 if (lp_profile_acls(SNUM(conn))) {
3070 /* For WXP SP1 the owner must be administrators. */
3071 sid_copy(&orig_owner_sid, &owner_sid);
3072 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3073 sid_copy(&group_sid, &global_sid_Builtin_Users);
3074 num_profile_acls = 3;
3075 }
3076
3077 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3078
3079 /*
3080 * In the optimum case Creator Owner and Creator Group would be used for
3081 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3082 * would lead to usability problems under Windows: The Creator entries
3083 * are only available in browse lists of directories and not for files;
3084 * additionally the identity of the owning group couldn't be determined.
3085 * We therefore use those identities only for Default ACLs.
3086 */
3087
3088 /* Create the canon_ace lists. */
3089 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3090 &owner_sid, &group_sid, pal,
3091 SMB_ACL_TYPE_ACCESS);
3092
3093 /* We must have *some* ACLS. */
3094
3095 if (count_canon_ace_list(file_ace) == 0) {
3096 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3097 goto done;
3098 }
3099
3100 if (S_ISDIR(sbuf->st_mode) && def_acl) {
3101 dir_ace = canonicalise_acl(conn, name, def_acl,
3102 sbuf,
3103 &global_sid_Creator_Owner,
3104 &global_sid_Creator_Group,
3105 pal, SMB_ACL_TYPE_DEFAULT);
3106 }
3107
3108 /*
3109 * Create the NT ACE list from the canonical ace lists.
3110 */
3111
3112 {
3113 canon_ace *ace;
3114 enum security_ace_type nt_acl_type;
3115
3116 if (nt4_compatible_acls() && dir_ace) {
3117 /*
3118 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3119 * but no non-INHERIT_ONLY entry for one SID. So we only
3120 * remove entries from the Access ACL if the
3121 * corresponding Default ACL entries have also been
3122 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3123 * are exceptions. We can do nothing
3124 * intelligent if the Default ACL contains entries that
3125 * are not also contained in the Access ACL, so this
3126 * case will still fail under NT 4.
3127 */
3128
3129 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3130 if (ace && !ace->perms) {
3131 DLIST_REMOVE(dir_ace, ace);
3132 SAFE_FREE(ace);
3133
3134 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3135 if (ace && !ace->perms) {
3136 DLIST_REMOVE(file_ace, ace);
3137 SAFE_FREE(ace);
3138 }
3139 }
3140
3141 /*
3142 * WinNT doesn't usually have Creator Group
3143 * in browse lists, so we send this entry to
3144 * WinNT even if it contains no relevant
3145 * permissions. Once we can add
3146 * Creator Group to browse lists we can
3147 * re-enable this.
3148 */
3149
3150 #if 0
3151 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3152 if (ace && !ace->perms) {
3153 DLIST_REMOVE(dir_ace, ace);
3154 SAFE_FREE(ace);
3155 }
3156 #endif
3157
3158 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3159 if (ace && !ace->perms) {
3160 DLIST_REMOVE(file_ace, ace);
3161 SAFE_FREE(ace);
3162 }
3163 }
3164
3165 num_acls = count_canon_ace_list(file_ace);
3166 num_def_acls = count_canon_ace_list(dir_ace);
3167
3168 /* Allocate the ace list. */
3169 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3170 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3171 goto done;
3172 }
3173
3174 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3175
3176 /*
3177 * Create the NT ACE list from the canonical ace lists.
3178 */
3179
3180 for (ace = file_ace; ace != NULL; ace = ace->next) {
3181 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3182 &nt_acl_type,
3183 ace->perms,
3184 S_ISDIR(sbuf->st_mode));
3185 init_sec_ace(&nt_ace_list[num_aces++],
3186 &ace->trustee,
3187 nt_acl_type,
3188 acc,
3189 ace->ace_flags);
3190 }
3191
3192 /* The User must have access to a profile share - even
3193 * if we can't map the SID. */
3194 if (lp_profile_acls(SNUM(conn))) {
3195 add_or_replace_ace(nt_ace_list, &num_aces,
3196 &global_sid_Builtin_Users,
3197 SEC_ACE_TYPE_ACCESS_ALLOWED,
3198 FILE_GENERIC_ALL, 0);
3199 }
3200
3201 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3202 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3203 &nt_acl_type,
3204 ace->perms,
3205 S_ISDIR(sbuf->st_mode));
3206 init_sec_ace(&nt_ace_list[num_aces++],
3207 &ace->trustee,
3208 nt_acl_type,
3209 acc,
3210 ace->ace_flags |
3211 SEC_ACE_FLAG_OBJECT_INHERIT|
3212 SEC_ACE_FLAG_CONTAINER_INHERIT|
3213 SEC_ACE_FLAG_INHERIT_ONLY);
3214 }
3215
3216 /* The User must have access to a profile share - even
3217 * if we can't map the SID. */
3218 if (lp_profile_acls(SNUM(conn))) {
3219 add_or_replace_ace(nt_ace_list, &num_aces,
3220 &global_sid_Builtin_Users,
3221 SEC_ACE_TYPE_ACCESS_ALLOWED,
3222 FILE_GENERIC_ALL,
3223 SEC_ACE_FLAG_OBJECT_INHERIT |
3224 SEC_ACE_FLAG_CONTAINER_INHERIT |
3225 SEC_ACE_FLAG_INHERIT_ONLY);
3226 }
3227
3228 /*
3229 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3230 * Win2K needs this to get the inheritance correct when replacing ACLs
3231 * on a directory tree. Based on work by Jim @ IBM.
3232 */
3233
3234 num_aces = merge_default_aces(nt_ace_list, num_aces);
3235
3236 if (lp_profile_acls(SNUM(conn))) {
3237 for (i = 0; i < num_aces; i++) {
3238 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3239 add_or_replace_ace(nt_ace_list, &num_aces,
3240 &orig_owner_sid,
3241 nt_ace_list[i].type,
3242 nt_ace_list[i].access_mask,
3243 nt_ace_list[i].flags);
3244 break;
3245 }
3246 }
3247 }
3248 }
3249
3250 if (num_aces) {
3251 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3252 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3253 goto done;
3254 }
3255 }
3256 } /* security_info & DACL_SECURITY_INFORMATION */
3257
3258 psd = make_standard_sec_desc( talloc_tos(),
3259 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3260 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3261 psa,
3262 &sd_size);
3263
3264 if(!psd) {
3265 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3266 sd_size = 0;
3267 goto done;
3268 }
3269
3270 /*
3271 * Windows 2000: The DACL_PROTECTED flag in the security
3272 * descriptor marks the ACL as non-inheriting, i.e., no
3273 * ACEs from higher level directories propagate to this
3274 * ACL. In the POSIX ACL model permissions are only
3275 * inherited at file create time, so ACLs never contain
3276 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3277 * flag doesn't seem to bother Windows NT.
3278 * Always set this if map acl inherit is turned off.
3279 */
3280 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3281 psd->type |= SEC_DESC_DACL_PROTECTED;
3282 } else {
3283 psd->type |= pal->sd_type;
3284 }
3285
3286 if (psd->dacl) {
3287 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3288 }
3289
3290 *ppdesc = psd;
3291
3292 done:
3293
3294 if (posix_acl) {
3295 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3296 }
3297 if (def_acl) {
3298 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3299 }
3300 free_canon_ace_list(file_ace);
3301 free_canon_ace_list(dir_ace);
3302 free_inherited_info(pal);
3303 SAFE_FREE(nt_ace_list);
3304
3305 return NT_STATUS_OK;
3306 }
3307
3308 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3309 SEC_DESC **ppdesc)
3310 {
3311 SMB_STRUCT_STAT sbuf;
3312 SMB_ACL_T posix_acl = NULL;
3313 struct pai_val *pal;
3314
3315 *ppdesc = NULL;
3316
3317 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3318
3319 /* can it happen that fsp_name == NULL ? */
3320 if (fsp->is_directory || fsp->fh->fd == -1) {
3321 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3322 security_info, ppdesc);
3323 }
3324
3325 /* Get the stat struct for the owner info. */
3326 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3327 return map_nt_error_from_unix(errno);
3328 }
3329
3330 /* Get the ACL from the fd. */
3331 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3332
3333 pal = fload_inherited_info(fsp);
3334
3335 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3336 posix_acl, NULL, security_info, ppdesc);
3337 }
3338
3339 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3340 uint32_t security_info, SEC_DESC **ppdesc)
3341 {
3342 SMB_STRUCT_STAT sbuf;
3343 SMB_ACL_T posix_acl = NULL;
3344 SMB_ACL_T def_acl = NULL;
3345 struct pai_val *pal;
3346
3347 *ppdesc = NULL;
3348
3349 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3350
3351 /* Get the stat struct for the owner info. */
3352 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3353 return map_nt_error_from_unix(errno);
3354 }
3355
3356 /* Get the ACL from the path. */
3357 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3358
3359 /* If it's a directory get the default POSIX ACL. */
3360 if(S_ISDIR(sbuf.st_mode)) {
3361 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3362 def_acl = free_empty_sys_acl(conn, def_acl);
3363 }
3364
3365 pal = load_inherited_info(conn, name);
3366
3367 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3368 def_acl, security_info, ppdesc);
3369 }
3370
3371 /****************************************************************************
3372 Try to chown a file. We will be able to chown it under the following conditions.
3373
3374 1) If we have root privileges, then it will just work.
3375 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3376 3) If we have SeRestorePrivilege we can change the user to any other user.
3377 4) If we have write permission to the file and dos_filemodes is set
3378 then allow chown to the currently authenticated user.
3379 ****************************************************************************/
3380
3381 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3382 {
3383 int ret;
3384 files_struct *fsp;
3385 SMB_STRUCT_STAT st;
3386
3387 if(!CAN_WRITE(conn)) {
3388 return -1;
3389 }
3390
3391 /* Case (1). */
3392 /* try the direct way first */
3393 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3394 if (ret == 0)
3395 return 0;
3396
3397 /* Case (2) / (3) */
3398 if (lp_enable_privileges()) {
3399
3400 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3401 &se_take_ownership);
3402 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3403 &se_restore);
3404
3405 /* Case (2) */
3406 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3407 /* Case (3) */
3408 ( has_restore_priv ) ) {
3409
3410 become_root();
3411 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3412 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3413 unbecome_root();
3414 return ret;
3415 }
3416 }
3417
3418 /* Case (4). */
3419 if (!lp_dos_filemode(SNUM(conn))) {
3420 errno = EPERM;
3421 return -1;
3422 }
3423
3424 /* only allow chown to the current user. This is more secure,
3425 and also copes with the case where the SID in a take ownership ACL is
3426 a local SID on the users workstation
3427 */
3428 if (uid != current_user.ut.uid) {
3429 errno = EPERM;
3430 return -1;
3431 }
3432
3433 if (SMB_VFS_STAT(conn,fname,&st)) {
3434 return -1;
3435 }
3436
3437 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, fname, &st, &fsp))) {
3438 return -1;
3439 }
3440
3441 become_root();
3442 /* Keep the current file gid the same. */
3443 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3444 unbecome_root();
3445
3446 close_file_fchmod(NULL, fsp);
3447
3448 return ret;
3449 }
3450
3451 #if 0
3452 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3453
3454 /****************************************************************************
3455 Take care of parent ACL inheritance.
3456 ****************************************************************************/
3457
3458 NTSTATUS append_parent_acl(files_struct *fsp,
3459 const SEC_DESC *pcsd,
3460 SEC_DESC **pp_new_sd)
3461 {
3462 SEC_DESC *parent_sd = NULL;
3463 files_struct *parent_fsp = NULL;
3464 TALLOC_CTX *mem_ctx = talloc_tos();
3465 char *parent_name = NULL;
3466 SEC_ACE *new_ace = NULL;
3467 unsigned int num_aces = pcsd->dacl->num_aces;
3468 SMB_STRUCT_STAT sbuf;
3469 NTSTATUS status;
3470 int info;
3471 unsigned int i, j;
3472 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3473 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3474
3475 ZERO_STRUCT(sbuf);
3476
3477 if (psd == NULL) {
3478 return NT_STATUS_NO_MEMORY;
3479 }
3480
3481 if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3482 return NT_STATUS_NO_MEMORY;
3483 }
3484
3485 status = SMB_VFS_CREATE_FILE(
3486 fsp->conn, /* conn */
3487 NULL, /* req */
3488 0, /* root_dir_fid */
3489 parent_name, /* fname */
3490 0, /* create_file_flags */
3491 FILE_READ_ATTRIBUTES, /* access_mask */
3492 FILE_SHARE_NONE, /* share_access */
3493 FILE_OPEN, /* create_disposition*/
3494 FILE_DIRECTORY_FILE, /* create_options */
3495 0, /* file_attributes */
3496 INTERNAL_OPEN_ONLY, /* oplock_request */
3497 0, /* allocation_size */
3498 NULL, /* sd */
3499 NULL, /* ea_list */
3500 &parent_fsp, /* result */
3501 &info, /* pinfo */
3502 &sbuf); /* psbuf */
3503
3504 if (!NT_STATUS_IS_OK(status)) {
3505 return status;
3506 }
3507
3508 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3509 DACL_SECURITY_INFORMATION, &parent_sd );
3510
3511 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3512
3513 if (!NT_STATUS_IS_OK(status)) {
3514 return status;
3515 }
3516
3517 /*
3518 * Make room for potentially all the ACLs from
3519 * the parent. We used to add the ugw triple here,
3520 * as we knew we were dealing with POSIX ACLs.
3521 * We no longer need to do so as we can guarentee
3522 * that a default ACL from the parent directory will
3523 * be well formed for POSIX ACLs if it came from a
3524 * POSIX ACL source, and if we're not writing to a
3525 * POSIX ACL sink then we don't care if it's not well
3526 * formed. JRA.
3527 */
3528
3529 num_aces += parent_sd->dacl->num_aces;
3530
3531 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3532 num_aces)) == NULL) {
3533 return NT_STATUS_NO_MEMORY;
3534 }
3535
3536 /* Start by copying in all the given ACE entries. */
3537 for (i = 0; i < psd->dacl->num_aces; i++) {
3538 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3539 }
3540
3541 /*
3542 * Note that we're ignoring "inherit permissions" here
3543 * as that really only applies to newly created files. JRA.
3544 */
3545
3546 /* Finally append any inherited ACEs. */
3547 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3548 SEC_ACE *se = &parent_sd->dacl->aces[j];
3549
3550 if (fsp->is_directory) {
3551 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3552 /* Doesn't apply to a directory - ignore. */
3553 DEBUG(10,("append_parent_acl: directory %s "
3554 "ignoring non container "
3555 "inherit flags %u on ACE with sid %s "
3556 "from parent %s\n",
3557 fsp->fsp_name,
3558 (unsigned int)se->flags,
3559 sid_string_dbg(&se->trustee),
3560 parent_name));
3561 continue;
3562 }
3563 } else {
3564 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3565 /* Doesn't apply to a file - ignore. */
3566 DEBUG(10,("append_parent_acl: file %s "
3567 "ignoring non object "
3568 "inherit flags %u on ACE with sid %s "
3569 "from parent %s\n",
3570 fsp->fsp_name,
3571 (unsigned int)se->flags,
3572 sid_string_dbg(&se->trustee),
3573 parent_name));
3574 continue;
3575 }
3576 }
3577
3578 if (is_dacl_protected) {
3579 /* If the DACL is protected it means we must
3580 * not overwrite an existing ACE entry with the
3581 * same SID. This is order N^2. Ouch :-(. JRA. */
3582 unsigned int k;
3583 for (k = 0; k < psd->dacl->num_aces; k++) {
3584 if (sid_equal(&psd->dacl->aces[k].trustee,
3585 &se->trustee)) {
3586 break;
3587 }
3588 }
3589 if (k < psd->dacl->num_aces) {
3590 /* SID matched. Ignore. */
3591 DEBUG(10,("append_parent_acl: path %s "
3592 "ignoring ACE with protected sid %s "
3593 "from parent %s\n",
3594 fsp->fsp_name,
3595 sid_string_dbg(&se->trustee),
3596 parent_name));
3597 continue;
3598 }
3599 }
3600
3601 sec_ace_copy(&new_ace[i], se);
3602 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3603 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3604 }
3605 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3606
3607 if (fsp->is_directory) {
3608 /*
3609 * Strip off any inherit only. It's applied.
3610 */
3611 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3612 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3613 /* No further inheritance. */
3614 new_ace[i].flags &=
3615 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3616 SEC_ACE_FLAG_OBJECT_INHERIT);
3617 }
3618 } else {
3619 /*
3620 * Strip off any container or inherit
3621 * flags, they can't apply to objects.
3622 */
3623 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3624 SEC_ACE_FLAG_INHERIT_ONLY|
3625 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3626 }
3627 i++;
3628
3629 DEBUG(10,("append_parent_acl: path %s "
3630 "inheriting ACE with sid %s "
3631 "from parent %s\n",
3632 fsp->fsp_name,
3633 sid_string_dbg(&se->trustee),
3634 parent_name));
3635 }
3636
3637 psd->dacl->aces = new_ace;
3638 psd->dacl->num_aces = i;
3639 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3640 SE_DESC_DACL_AUTO_INHERIT_REQ);
3641
3642 *pp_new_sd = psd;
3643 return status;
3644 }
3645 #endif
3646
3647 /****************************************************************************
3648 Reply to set a security descriptor on an fsp. security_info_sent is the
3649 description of the following NT ACL.
3650 This should be the only external function needed for the UNIX style set ACL.
3651 ****************************************************************************/
3652
3653 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3654 {
3655 connection_struct *conn = fsp->conn;
3656 uid_t user = (uid_t)-1;
3657 gid_t grp = (gid_t)-1;
3658 SMB_STRUCT_STAT sbuf;
3659 DOM_SID file_owner_sid;
3660 DOM_SID file_grp_sid;
3661 canon_ace *file_ace_list = NULL;
3662 canon_ace *dir_ace_list = NULL;
3663 bool acl_perms = False;
3664 mode_t orig_mode = (mode_t)0;
3665 NTSTATUS status;
3666 bool set_acl_as_root = false;
3667 bool acl_set_support = false;
3668 bool ret = false;
3669
3670 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3671
3672 if (!CAN_WRITE(conn)) {
3673 DEBUG(10,("set acl rejected on read-only share\n"));
3674 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3675 }
3676
3677 /*
3678 * Get the current state of the file.
3679 */
3680
3681 if(fsp->is_directory || fsp->fh->fd == -1) {
3682 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3683 return map_nt_error_from_unix(errno);
3684 } else {
3685 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3686 return map_nt_error_from_unix(errno);
3687 }
3688
3689 /* Save the original element we check against. */
3690 orig_mode = sbuf.st_mode;
3691
3692 /*
3693 * Unpack the user/group/world id's.
3694 */
3695
3696 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3697 if (!NT_STATUS_IS_OK(status)) {
3698 return status;
3699 }
3700
3701 /*
3702 * Do we need to chown ? If so this must be done first as the incoming
3703 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3704 * Noticed by Simo.
3705 */
3706
3707 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3708
3709 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3710 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3711
3712 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3713 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3714 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3715 if (errno == EPERM) {
3716 return NT_STATUS_INVALID_OWNER;
3717 }
3718 return map_nt_error_from_unix(errno);
3719 }
3720
3721 /*
3722 * Recheck the current state of the file, which may have changed.
3723 * (suid/sgid bits, for instance)
3724 */
3725
3726 if(fsp->is_directory) {
3727 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3728 return map_nt_error_from_unix(errno);
3729 }
3730 } else {
3731
3732 int sret;
3733
3734 if(fsp->fh->fd == -1)
3735 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3736 else
3737 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3738
3739 if(sret != 0)
3740 return map_nt_error_from_unix(errno);
3741 }
3742
3743 /* Save the original element we check against. */
3744 orig_mode = sbuf.st_mode;
3745
3746 /* If we successfully chowned, we know we must
3747 * be able to set the acl, so do it as root.
3748 */
3749 set_acl_as_root = true;
3750 }
3751
3752 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3753
3754 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3755 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3756
3757 /* Ignore W2K traverse DACL set. */
3758 if (!file_ace_list && !dir_ace_list) {
3759 return NT_STATUS_OK;
3760 }
3761
3762 if (!acl_perms) {
3763 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3764 free_canon_ace_list(file_ace_list);
3765 free_canon_ace_list(dir_ace_list);
3766 return NT_STATUS_ACCESS_DENIED;
3767 }
3768
3769 /*
3770 * Only change security if we got a DACL.
3771 */
3772
3773 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3774 free_canon_ace_list(file_ace_list);
3775 free_canon_ace_list(dir_ace_list);
3776 return NT_STATUS_OK;
3777 }
3778
3779 /*
3780 * Try using the POSIX ACL set first. Fall back to chmod if
3781 * we have no ACL support on this filesystem.
3782 */
3783
3784 if (acl_perms && file_ace_list) {
3785 if (set_acl_as_root) {
3786 become_root();
3787 }
3788 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3789 if (set_acl_as_root) {
3790 unbecome_root();
3791 }
3792 if (acl_set_support && ret == false) {
3793 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3794 free_canon_ace_list(file_ace_list);
3795 free_canon_ace_list(dir_ace_list);
3796 return map_nt_error_from_unix(errno);
3797 }
3798 }
3799
3800 if (acl_perms && acl_set_support && fsp->is_directory) {
3801 if (dir_ace_list) {
3802 if (set_acl_as_root) {
3803 become_root();
3804 }
3805 ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3806 if (set_acl_as_root) {
3807 unbecome_root();
3808 }
3809 if (ret == false) {
3810 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3811 free_canon_ace_list(file_ace_list);
3812 free_canon_ace_list(dir_ace_list);
3813 return map_nt_error_from_unix(errno);
3814 }
3815 } else {
3816 int sret = -1;
3817
3818 /*
3819 * No default ACL - delete one if it exists.
3820 */
3821
3822 if (set_acl_as_root) {
3823 become_root();
3824 }
3825 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3826 if (set_acl_as_root) {
3827 unbecome_root();
3828 }
3829 if (sret == -1) {
3830 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3831 DEBUG(5,("set_nt_acl: acl group control on and "
3832 "current user in file %s primary group. Override delete_def_acl\n",
3833 fsp->fsp_name ));
3834
3835 become_root();
3836 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3837 unbecome_root();
3838 }
3839
3840 if (sret == -1) {
3841 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3842 free_canon_ace_list(file_ace_list);
3843 free_canon_ace_list(dir_ace_list);
3844 return map_nt_error_from_unix(errno);
3845 }
3846 }
3847 }
3848 }
3849
3850 if (acl_set_support) {
3851 if (set_acl_as_root) {
3852 become_root();
3853 }
3854 store_inheritance_attributes(fsp,
3855 file_ace_list,
3856 dir_ace_list,
3857 psd->type);
3858 if (set_acl_as_root) {
3859 unbecome_root();
3860 }
3861 }
3862
3863 /*
3864 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3865 */
3866
3867 if(!acl_set_support && acl_perms) {
3868 mode_t posix_perms;
3869
3870 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3871 free_canon_ace_list(file_ace_list);
3872 free_canon_ace_list(dir_ace_list);
3873 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3874 fsp->fsp_name ));
3875 return NT_STATUS_ACCESS_DENIED;
3876 }
3877
3878 if (orig_mode != posix_perms) {
3879 int sret = -1;
3880
3881 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3882 fsp->fsp_name, (unsigned int)posix_perms ));
3883
3884 if (set_acl_as_root) {
3885 become_root();
3886 }
3887 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3888 if (set_acl_as_root) {
3889 unbecome_root();
3890 }
3891 if(sret == -1) {
3892 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3893 DEBUG(5,("set_nt_acl: acl group control on and "
3894 "current user in file %s primary group. Override chmod\n",
3895 fsp->fsp_name ));
3896
3897 become_root();
3898 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3899 unbecome_root();
3900 }
3901
3902 if (sret == -1) {
3903 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3904 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3905 free_canon_ace_list(file_ace_list);
3906 free_canon_ace_list(dir_ace_list);
3907 return map_nt_error_from_unix(errno);
3908 }
3909 }
3910 }
3911 }
3912
3913 free_canon_ace_list(file_ace_list);
3914 free_canon_ace_list(dir_ace_list);
3915
3916 return NT_STATUS_OK;
3917 }
3918
3919 /****************************************************************************
3920 Get the actual group bits stored on a file with an ACL. Has no effect if
3921 the file has no ACL. Needed in dosmode code where the stat() will return
3922 the mask bits, not the real group bits, for a file with an ACL.
3923 ****************************************************************************/
3924
3925 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3926 {
3927 int entry_id = SMB_ACL_FIRST_ENTRY;
3928 SMB_ACL_ENTRY_T entry;
3929 SMB_ACL_T posix_acl;
3930 int result = -1;
3931
3932 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3933 if (posix_acl == (SMB_ACL_T)NULL)
3934 return -1;
3935
3936 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3937 SMB_ACL_TAG_T tagtype;
3938 SMB_ACL_PERMSET_T permset;
3939
3940 entry_id = SMB_ACL_NEXT_ENTRY;
3941
3942 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3943 break;
3944
3945 if (tagtype == SMB_ACL_GROUP_OBJ) {
3946 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3947 break;
3948 } else {
3949 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3950 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3951 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3952 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3953 result = 0;
3954 break;
3955 }
3956 }
3957 }
3958 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3959 return result;
3960 }
3961
3962 /****************************************************************************
3963 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3964 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3965 ****************************************************************************/
3966
3967 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3968 {
3969 int entry_id = SMB_ACL_FIRST_ENTRY;
3970 SMB_ACL_ENTRY_T entry;
3971 int num_entries = 0;
3972
3973 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3974 SMB_ACL_TAG_T tagtype;
3975 SMB_ACL_PERMSET_T permset;
3976 mode_t perms;
3977
3978 entry_id = SMB_ACL_NEXT_ENTRY;
3979
3980 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3981 return -1;
3982
3983 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3984 return -1;
3985
3986 num_entries++;
3987
3988 switch(tagtype) {
3989 case SMB_ACL_USER_OBJ:
3990 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3991 break;
3992 case SMB_ACL_GROUP_OBJ:
3993 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3994 break;
3995 case SMB_ACL_MASK:
3996 /*
3997 * FIXME: The ACL_MASK entry permissions should really be set to
3998 * the union of the permissions of all ACL_USER,
3999 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4000 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4001 */
4002 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4003 break;
4004 case SMB_ACL_OTHER:
4005 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4006 break;
4007 default:
4008 continue;
4009 }
4010
4011 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4012 return -1;
4013
4014 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4015 return -1;
4016 }
4017
4018 /*
4019 * If this is a simple 3 element ACL or no elements then it's a standard
4020 * UNIX permission set. Just use chmod...
4021 */
4022
4023 if ((num_entries == 3) || (num_entries == 0))
4024 return -1;
4025
4026 return 0;
4027 }
4028
4029 /****************************************************************************
4030 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4031 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4032 resulting ACL on TO. Note that name is in UNIX character set.
4033 ****************************************************************************/
4034
4035 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4036 {
4037 SMB_ACL_T posix_acl = NULL;
4038 int ret = -1;
4039
4040 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4041 return -1;
4042
4043 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4044 goto done;
4045
4046 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4047
4048 done:
4049
4050 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4051 return ret;
4052 }
4053
4054 /****************************************************************************
4055 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4056 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4057 Note that name is in UNIX character set.
4058 ****************************************************************************/
4059
4060 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4061 {
4062 return copy_access_posix_acl(conn, name, name, mode);
4063 }
4064
4065 /****************************************************************************
4066 Check for an existing default POSIX ACL on a directory.
4067 ****************************************************************************/
4068
4069 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4070 {
4071 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4072 bool has_acl = False;
4073 SMB_ACL_ENTRY_T entry;
4074
4075 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4076 has_acl = True;
4077 }
4078
4079 if (def_acl) {
4080 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4081 }
4082 return has_acl;
4083 }
4084
4085 /****************************************************************************
4086 If the parent directory has no default ACL but it does have an Access ACL,
4087 inherit this Access ACL to file name.
4088 ****************************************************************************/
4089
4090 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4091 const char *name, mode_t mode)
4092 {
4093 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4094 return 0;
4095
4096 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4097 }
4098
4099 /****************************************************************************
4100 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4101 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4102 ****************************************************************************/
4103
4104 int fchmod_acl(files_struct *fsp, mode_t mode)
4105 {
4106 connection_struct *conn = fsp->conn;
4107 SMB_ACL_T posix_acl = NULL;
4108 int ret = -1;
4109
4110 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4111 return -1;
4112
4113 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4114 goto done;
4115
4116 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4117
4118 done:
4119
4120 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4121 return ret;
4122 }
4123
4124 /****************************************************************************
4125 Map from wire type to permset.
4126 ****************************************************************************/
4127
4128 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4129 {
4130 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4131 return False;
4132 }
4133
4134 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4135 return False;
4136 }
4137
4138 if (wire_perm & SMB_POSIX_ACL_READ) {
4139 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4140 return False;
4141 }
4142 }
4143 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4144 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4145 return False;
4146 }
4147 }
4148 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4149 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4150 return False;
4151 }
4152 }
4153 return True;
4154 }
4155
4156 /****************************************************************************
4157 Map from wire type to tagtype.
4158 ****************************************************************************/
4159
4160 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4161 {
4162 switch (wire_tt) {
4163 case SMB_POSIX_ACL_USER_OBJ:
4164 *p_tt = SMB_ACL_USER_OBJ;
4165 break;
4166 case SMB_POSIX_ACL_USER:
4167 *p_tt = SMB_ACL_USER;
4168 break;
4169 case SMB_POSIX_ACL_GROUP_OBJ:
4170 *p_tt = SMB_ACL_GROUP_OBJ;
4171 break;
4172 case SMB_POSIX_ACL_GROUP:
4173 *p_tt = SMB_ACL_GROUP;
4174 break;
4175 case SMB_POSIX_ACL_MASK:
4176 *p_tt = SMB_ACL_MASK;
4177 break;
4178 case SMB_POSIX_ACL_OTHER:
4179 *p_tt = SMB_ACL_OTHER;
4180 break;
4181 default:
4182 return False;
4183 }
4184 return True;
4185 }
4186
4187 /****************************************************************************
4188 Create a new POSIX acl from wire permissions.
4189 FIXME ! How does the share mask/mode fit into this.... ?
4190 ****************************************************************************/
4191
4192 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4193 {
4194 unsigned int i;
4195 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4196
4197 if (the_acl == NULL) {
4198 return NULL;
4199 }
4200
4201 for (i = 0; i < num_acls; i++) {
4202 SMB_ACL_ENTRY_T the_entry;
4203 SMB_ACL_PERMSET_T the_permset;
4204 SMB_ACL_TAG_T tag_type;
4205
4206 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4207 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4208 i, strerror(errno) ));
4209 goto fail;
4210 }
4211
4212 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4213 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4214 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4215 goto fail;
4216 }
4217
4218 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4219 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4220 i, strerror(errno) ));
4221 goto fail;
4222 }
4223
4224 /* Get the permset pointer from the new ACL entry. */
4225 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4226 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4227 i, strerror(errno) ));
4228 goto fail;
4229 }
4230
4231 /* Map from wire to permissions. */
4232 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4233 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4234 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4235 goto fail;
4236 }
4237
4238 /* Now apply to the new ACL entry. */
4239 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4240 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4241 i, strerror(errno) ));
4242 goto fail;
4243 }
4244
4245 if (tag_type == SMB_ACL_USER) {
4246 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4247 uid_t uid = (uid_t)uidval;
4248 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4249 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4250 (unsigned int)uid, i, strerror(errno) ));
4251 goto fail;
4252 }
4253 }
4254
4255 if (tag_type == SMB_ACL_GROUP) {
4256 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4257 gid_t gid = (uid_t)gidval;
4258 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4259 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4260 (unsigned int)gid, i, strerror(errno) ));
4261 goto fail;
4262 }
4263 }
4264 }
4265
4266 return the_acl;
4267
4268 fail:
4269
4270 if (the_acl != NULL) {
4271 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4272 }
4273 return NULL;
4274 }
4275
4276 /****************************************************************************
4277 Calls from UNIX extensions - Default POSIX ACL set.
4278 If num_def_acls == 0 and not a directory just return. If it is a directory
4279 and num_def_acls == 0 then remove the default acl. Else set the default acl
4280 on the directory.
4281 ****************************************************************************/
4282
4283 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4284 uint16 num_def_acls, const char *pdata)
4285 {
4286 SMB_ACL_T def_acl = NULL;
4287
4288 if (!S_ISDIR(psbuf->st_mode)) {
4289 if (num_def_acls) {
4290 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4291 errno = EISDIR;
4292 return False;
4293 } else {
4294 return True;
4295 }
4296 }
4297
4298 if (!num_def_acls) {
4299 /* Remove the default ACL. */
4300 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4301 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4302 fname, strerror(errno) ));
4303 return False;
4304 }
4305 return True;
4306 }
4307
4308 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4309 return False;
4310 }
4311
4312 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4313 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4314 fname, strerror(errno) ));
4315 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4316 return False;
4317 }
4318
4319 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4320 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4321 return True;
4322 }
4323
4324 /****************************************************************************
4325 Remove an ACL from a file. As we don't have acl_delete_entry() available
4326 we must read the current acl and copy all entries except MASK, USER and GROUP
4327 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4328 removed.
4329 FIXME ! How does the share mask/mode fit into this.... ?
4330 ****************************************************************************/
4331
4332 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4333 {
4334 SMB_ACL_T file_acl = NULL;
4335 int entry_id = SMB_ACL_FIRST_ENTRY;
4336 SMB_ACL_ENTRY_T entry;
4337 bool ret = False;
4338 /* Create a new ACL with only 3 entries, u/g/w. */
4339 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4340 SMB_ACL_ENTRY_T user_ent = NULL;
4341 SMB_ACL_ENTRY_T group_ent = NULL;
4342 SMB_ACL_ENTRY_T other_ent = NULL;
4343
4344 if (new_file_acl == NULL) {
4345 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4346 return False;
4347 }
4348
4349 /* Now create the u/g/w entries. */
4350 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4351 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4352 fname, strerror(errno) ));
4353 goto done;
4354 }
4355 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4356 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4357 fname, strerror(errno) ));
4358 goto done;
4359 }
4360
4361 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4362 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4363 fname, strerror(errno) ));
4364 goto done;
4365 }
4366 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4367 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4368 fname, strerror(errno) ));
4369 goto done;
4370 }
4371
4372 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4373 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4374 fname, strerror(errno) ));
4375 goto done;
4376 }
4377 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4378 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4379 fname, strerror(errno) ));
4380 goto done;
4381 }
4382
4383 /* Get the current file ACL. */
4384 if (fsp && fsp->fh->fd != -1) {
4385 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4386 } else {
4387 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4388 }
4389
4390 if (file_acl == NULL) {
4391 /* This is only returned if an error occurred. Even for a file with
4392 no acl a u/g/w acl should be returned. */
4393 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4394 fname, strerror(errno) ));
4395 goto done;
4396 }
4397
4398 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4399 SMB_ACL_TAG_T tagtype;
4400 SMB_ACL_PERMSET_T permset;
4401
4402 entry_id = SMB_ACL_NEXT_ENTRY;
4403
4404 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4405 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4406 fname, strerror(errno) ));
4407 goto done;
4408 }
4409
4410 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4411 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4412 fname, strerror(errno) ));
4413 goto done;
4414 }
4415
4416 if (tagtype == SMB_ACL_USER_OBJ) {
4417 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4418 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4419 fname, strerror(errno) ));
4420 }
4421 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4422 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4423 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4424 fname, strerror(errno) ));
4425 }
4426 } else if (tagtype == SMB_ACL_OTHER) {
4427 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4428 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4429 fname, strerror(errno) ));
4430 }
4431 }
4432 }
4433
4434 /* Set the new empty file ACL. */
4435 if (fsp && fsp->fh->fd != -1) {
4436 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4437 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4438 fname, strerror(errno) ));
4439 goto done;
4440 }
4441 } else {
4442 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4443 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4444 fname, strerror(errno) ));
4445 goto done;
4446 }
4447 }
4448
4449 ret = True;
4450
4451 done:
4452
4453 if (file_acl) {
4454 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4455 }
4456 if (new_file_acl) {
4457 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4458 }
4459 return ret;
4460 }
4461
4462 /****************************************************************************
4463 Calls from UNIX extensions - POSIX ACL set.
4464 If num_def_acls == 0 then read/modify/write acl after removing all entries
4465 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4466 ****************************************************************************/
4467
4468 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4469 {
4470 SMB_ACL_T file_acl = NULL;
4471
4472 if (!num_acls) {
4473 /* Remove the ACL from the file. */
4474 return remove_posix_acl(conn, fsp, fname);
4475 }
4476
4477 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4478 return False;
4479 }
4480
4481 if (fsp && fsp->fh->fd != -1) {
4482 /* The preferred way - use an open fd. */
4483 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4484 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4485 fname, strerror(errno) ));
4486 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4487 return False;
4488 }
4489 } else {
4490 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4491 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4492 fname, strerror(errno) ));
4493 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4494 return False;
4495 }
4496 }
4497
4498 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4499 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4500 return True;
4501 }
4502
4503 /********************************************************************
4504 Pull the NT ACL from a file on disk or the OpenEventlog() access
4505 check. Caller is responsible for freeing the returned security
4506 descriptor via TALLOC_FREE(). This is designed for dealing with
4507 user space access checks in smbd outside of the VFS. For example,
4508 checking access rights in OpenEventlog().
4509
4510 Assume we are dealing with files (for now)
4511 ********************************************************************/
4512
4513 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4514 {
4515 SEC_DESC *psd, *ret_sd;
4516 connection_struct *conn;
4517 files_struct finfo;
4518 struct fd_handle fh;
4519
4520 conn = TALLOC_ZERO_P(ctx, connection_struct);
4521 if (conn == NULL) {
4522 DEBUG(0, ("talloc failed\n"));
4523 return NULL;
4524 }
4525
4526 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4527 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4528 TALLOC_FREE(conn);
4529 return NULL;
4530 }
4531
4532 conn->params->service = -1;
4533
4534 set_conn_connectpath(conn, "/");
4535
4536 if (!smbd_vfs_init(conn)) {
4537 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4538 conn_free_internal( conn );
4539 return NULL;
4540 }
4541
4542 ZERO_STRUCT( finfo );
4543 ZERO_STRUCT( fh );
4544
4545 finfo.fnum = -1;
4546 finfo.conn = conn;
4547 finfo.fh = &fh;
4548 finfo.fh->fd = -1;
4549 finfo.fsp_name = CONST_DISCARD(char *,fname);
4550
4551 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4552 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4553 conn_free_internal( conn );
4554 return NULL;
4555 }
4556
4557 ret_sd = dup_sec_desc( ctx, psd );
4558
4559 conn_free_internal( conn );
4560
4561 return ret_sd;
4562 }
WIP