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Make the posix ACL module cope with a NULL incoming DACL and a missing owner/group.
[Samba.git] / source3 / smbd / posix_acls.c
blob78708a70d9f1a9e4b676bd4f2f5f6d7348f21eab
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern const struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 uint8_t ace_flags; /* From windows ACE entry. */
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk - version 1.
59 * All values are little endian.
60 *
61 * | 1 | 1 | 2 | 2 | ....
62 * +------+------+-------------+---------------------+-------------+--------------------+
63 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 *
66 * Entry format is :
67 *
68 * | 1 | 4 |
69 * +------+-------------------+
70 * | value| uid/gid or world |
71 * | type | value |
72 * +------+-------------------+
73 *
74 * Version 2 format. Stores extra Windows metadata about an ACL.
75 *
76 * | 1 | 2 | 2 | 2 | ....
77 * +------+----------+-------------+---------------------+-------------+--------------------+
78 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
79 * | 2 | type | | | | |
80 * +------+----------+-------------+---------------------+-------------+--------------------+
81 *
82 * Entry format is :
83 *
84 * | 1 | 1 | 4 |
85 * +------+------+-------------------+
86 * | ace | value| uid/gid or world |
87 * | flag | type | value |
88 * +------+-------------------+------+
89 *
90 */
91
92 #define PAI_VERSION_OFFSET 0
93
94 #define PAI_V1_FLAG_OFFSET 1
95 #define PAI_V1_NUM_ENTRIES_OFFSET 2
96 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97 #define PAI_V1_ENTRIES_BASE 6
98 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
99 #define PAI_V1_ENTRY_LENGTH 5
100
101 #define PAI_V1_VERSION 1
102
103 #define PAI_V2_TYPE_OFFSET 1
104 #define PAI_V2_NUM_ENTRIES_OFFSET 3
105 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106 #define PAI_V2_ENTRIES_BASE 7
107 #define PAI_V2_ENTRY_LENGTH 6
108
109 #define PAI_V2_VERSION 2
110
111 /*
112 * In memory format of user.SAMBA_PAI attribute.
113 */
114
115 struct pai_entry {
116 struct pai_entry *next, *prev;
117 uint8_t ace_flags;
118 enum ace_owner owner_type;
119 posix_id unix_ug;
120 };
121
122 struct pai_val {
123 uint16_t sd_type;
124 unsigned int num_entries;
125 struct pai_entry *entry_list;
126 unsigned int num_def_entries;
127 struct pai_entry *def_entry_list;
128 };
129
130 /************************************************************************
131 Return a uint32 of the pai_entry principal.
132 ************************************************************************/
133
134 static uint32_t get_pai_entry_val(struct pai_entry *paie)
135 {
136 switch (paie->owner_type) {
137 case UID_ACE:
138 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139 return (uint32_t)paie->unix_ug.uid;
140 case GID_ACE:
141 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142 return (uint32_t)paie->unix_ug.gid;
143 case WORLD_ACE:
144 default:
145 DEBUG(10,("get_pai_entry_val: world ace\n"));
146 return (uint32_t)-1;
147 }
148 }
149
150 /************************************************************************
151 Return a uint32 of the entry principal.
152 ************************************************************************/
153
154 static uint32_t get_entry_val(canon_ace *ace_entry)
155 {
156 switch (ace_entry->owner_type) {
157 case UID_ACE:
158 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159 return (uint32_t)ace_entry->unix_ug.uid;
160 case GID_ACE:
161 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162 return (uint32_t)ace_entry->unix_ug.gid;
163 case WORLD_ACE:
164 default:
165 DEBUG(10,("get_entry_val: world ace\n"));
166 return (uint32_t)-1;
167 }
168 }
169
170 /************************************************************************
171 Create the on-disk format (always v2 now). Caller must free.
172 ************************************************************************/
173
174 static char *create_pai_buf_v2(canon_ace *file_ace_list,
175 canon_ace *dir_ace_list,
176 uint16_t sd_type,
177 size_t *store_size)
178 {
179 char *pai_buf = NULL;
180 canon_ace *ace_list = NULL;
181 char *entry_offset = NULL;
182 unsigned int num_entries = 0;
183 unsigned int num_def_entries = 0;
184 unsigned int i;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 num_entries++;
188 }
189
190 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
191 num_def_entries++;
192 }
193
194 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
195
196 *store_size = PAI_V2_ENTRIES_BASE +
197 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
198
199 pai_buf = (char *)SMB_MALLOC(*store_size);
200 if (!pai_buf) {
201 return NULL;
202 }
203
204 /* Set up the header. */
205 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
206 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
207 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
208 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
209 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
210
211 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
212 (unsigned int)sd_type ));
213
214 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
215
216 i = 0;
217 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
218 uint8_t type_val = (uint8_t)ace_list->owner_type;
219 uint32_t entry_val = get_entry_val(ace_list);
220
221 SCVAL(entry_offset,0,ace_list->ace_flags);
222 SCVAL(entry_offset,1,type_val);
223 SIVAL(entry_offset,2,entry_val);
224 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
225 i,
226 (unsigned int)ace_list->ace_flags,
227 (unsigned int)type_val,
228 (unsigned int)entry_val ));
229 i++;
230 entry_offset += PAI_V2_ENTRY_LENGTH;
231 }
232
233 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
234 uint8_t type_val = (uint8_t)ace_list->owner_type;
235 uint32_t entry_val = get_entry_val(ace_list);
236
237 SCVAL(entry_offset,0,ace_list->ace_flags);
238 SCVAL(entry_offset,1,type_val);
239 SIVAL(entry_offset,2,entry_val);
240 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
241 i,
242 (unsigned int)ace_list->ace_flags,
243 (unsigned int)type_val,
244 (unsigned int)entry_val ));
245 i++;
246 entry_offset += PAI_V2_ENTRY_LENGTH;
247 }
248
249 return pai_buf;
250 }
251
252 /************************************************************************
253 Store the user.SAMBA_PAI attribute on disk.
254 ************************************************************************/
255
256 static void store_inheritance_attributes(files_struct *fsp,
257 canon_ace *file_ace_list,
258 canon_ace *dir_ace_list,
259 uint16_t sd_type)
260 {
261 int ret;
262 size_t store_size;
263 char *pai_buf;
264
265 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
266 return;
267 }
268
269 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
270 sd_type, &store_size);
271
272 if (fsp->fh->fd != -1) {
273 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
274 pai_buf, store_size, 0);
275 } else {
276 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
277 SAMBA_POSIX_INHERITANCE_EA_NAME,
278 pai_buf, store_size, 0);
279 }
280
281 SAFE_FREE(pai_buf);
282
283 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
284 (unsigned int)sd_type,
285 fsp_str_dbg(fsp)));
286
287 if (ret == -1 && !no_acl_syscall_error(errno)) {
288 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
289 }
290 }
291
292 /************************************************************************
293 Delete the in memory inheritance info.
294 ************************************************************************/
295
296 static void free_inherited_info(struct pai_val *pal)
297 {
298 if (pal) {
299 struct pai_entry *paie, *paie_next;
300 for (paie = pal->entry_list; paie; paie = paie_next) {
301 paie_next = paie->next;
302 SAFE_FREE(paie);
303 }
304 for (paie = pal->def_entry_list; paie; paie = paie_next) {
305 paie_next = paie->next;
306 SAFE_FREE(paie);
307 }
308 SAFE_FREE(pal);
309 }
310 }
311
312 /************************************************************************
313 Get any stored ACE flags.
314 ************************************************************************/
315
316 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
317 {
318 struct pai_entry *paie;
319
320 if (!pal) {
321 return 0;
322 }
323
324 /* If the entry exists it is inherited. */
325 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
326 if (ace_entry->owner_type == paie->owner_type &&
327 get_entry_val(ace_entry) == get_pai_entry_val(paie))
328 return paie->ace_flags;
329 }
330 return 0;
331 }
332
333 /************************************************************************
334 Ensure an attribute just read is valid - v1.
335 ************************************************************************/
336
337 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
338 {
339 uint16 num_entries;
340 uint16 num_def_entries;
341
342 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
343 /* Corrupted - too small. */
344 return false;
345 }
346
347 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
348 return false;
349 }
350
351 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
352 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
353
354 /* Check the entry lists match. */
355 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
356
357 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
358 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
359 return false;
360 }
361
362 return true;
363 }
364
365 /************************************************************************
366 Ensure an attribute just read is valid - v2.
367 ************************************************************************/
368
369 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
370 {
371 uint16 num_entries;
372 uint16 num_def_entries;
373
374 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
375 /* Corrupted - too small. */
376 return false;
377 }
378
379 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
380 return false;
381 }
382
383 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
384 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
385
386 /* Check the entry lists match. */
387 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
388
389 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
390 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
391 return false;
392 }
393
394 return true;
395 }
396
397 /************************************************************************
398 Decode the owner.
399 ************************************************************************/
400
401 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
402 {
403 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
404 switch( paie->owner_type) {
405 case UID_ACE:
406 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
407 DEBUG(10,("get_pai_owner_type: uid = %u\n",
408 (unsigned int)paie->unix_ug.uid ));
409 break;
410 case GID_ACE:
411 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412 DEBUG(10,("get_pai_owner_type: gid = %u\n",
413 (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("get_pai_owner_type: world ace\n"));
418 break;
419 default:
420 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
421 (unsigned int)paie->owner_type ));
422 return false;
423 }
424 return true;
425 }
426
427 /************************************************************************
428 Process v2 entries.
429 ************************************************************************/
430
431 static const char *create_pai_v1_entries(struct pai_val *paiv,
432 const char *entry_offset,
433 bool def_entry)
434 {
435 int i;
436
437 for (i = 0; i < paiv->num_entries; i++) {
438 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
439 if (!paie) {
440 return NULL;
441 }
442
443 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
444 if (!get_pai_owner_type(paie, entry_offset)) {
445 return NULL;
446 }
447
448 if (!def_entry) {
449 DLIST_ADD(paiv->entry_list, paie);
450 } else {
451 DLIST_ADD(paiv->def_entry_list, paie);
452 }
453 entry_offset += PAI_V1_ENTRY_LENGTH;
454 }
455 return entry_offset;
456 }
457
458 /************************************************************************
459 Convert to in-memory format from version 1.
460 ************************************************************************/
461
462 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
463 {
464 const char *entry_offset;
465 struct pai_val *paiv = NULL;
466
467 if (!check_pai_ok_v1(buf, size)) {
468 return NULL;
469 }
470
471 paiv = SMB_MALLOC_P(struct pai_val);
472 if (!paiv) {
473 return NULL;
474 }
475
476 memset(paiv, '\0', sizeof(struct pai_val));
477
478 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
479 SE_DESC_DACL_PROTECTED : 0;
480
481 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
482 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
483
484 entry_offset = buf + PAI_V1_ENTRIES_BASE;
485
486 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
487 paiv->num_entries, paiv->num_def_entries ));
488
489 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
490 if (entry_offset == NULL) {
491 free_inherited_info(paiv);
492 return NULL;
493 }
494 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
495 if (entry_offset == NULL) {
496 free_inherited_info(paiv);
497 return NULL;
498 }
499
500 return paiv;
501 }
502
503 /************************************************************************
504 Process v2 entries.
505 ************************************************************************/
506
507 static const char *create_pai_v2_entries(struct pai_val *paiv,
508 unsigned int num_entries,
509 const char *entry_offset,
510 bool def_entry)
511 {
512 unsigned int i;
513
514 for (i = 0; i < num_entries; i++) {
515 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
516 if (!paie) {
517 return NULL;
518 }
519
520 paie->ace_flags = CVAL(entry_offset,0);
521
522 if (!get_pai_owner_type(paie, entry_offset+1)) {
523 return NULL;
524 }
525 if (!def_entry) {
526 DLIST_ADD(paiv->entry_list, paie);
527 } else {
528 DLIST_ADD(paiv->def_entry_list, paie);
529 }
530 entry_offset += PAI_V2_ENTRY_LENGTH;
531 }
532 return entry_offset;
533 }
534
535 /************************************************************************
536 Convert to in-memory format from version 2.
537 ************************************************************************/
538
539 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
540 {
541 const char *entry_offset;
542 struct pai_val *paiv = NULL;
543
544 if (!check_pai_ok_v2(buf, size)) {
545 return NULL;
546 }
547
548 paiv = SMB_MALLOC_P(struct pai_val);
549 if (!paiv) {
550 return NULL;
551 }
552
553 memset(paiv, '\0', sizeof(struct pai_val));
554
555 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
556
557 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
558 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
559
560 entry_offset = buf + PAI_V2_ENTRIES_BASE;
561
562 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
563 (unsigned int)paiv->sd_type,
564 paiv->num_entries, paiv->num_def_entries ));
565
566 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
567 entry_offset, false);
568 if (entry_offset == NULL) {
569 free_inherited_info(paiv);
570 return NULL;
571 }
572 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
573 entry_offset, true);
574 if (entry_offset == NULL) {
575 free_inherited_info(paiv);
576 return NULL;
577 }
578
579 return paiv;
580 }
581
582 /************************************************************************
583 Convert to in-memory format - from either version 1 or 2.
584 ************************************************************************/
585
586 static struct pai_val *create_pai_val(const char *buf, size_t size)
587 {
588 if (size < 1) {
589 return NULL;
590 }
591 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
592 return create_pai_val_v1(buf, size);
593 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
594 return create_pai_val_v2(buf, size);
595 } else {
596 return NULL;
597 }
598 }
599
600 /************************************************************************
601 Load the user.SAMBA_PAI attribute.
602 ************************************************************************/
603
604 static struct pai_val *fload_inherited_info(files_struct *fsp)
605 {
606 char *pai_buf;
607 size_t pai_buf_size = 1024;
608 struct pai_val *paiv = NULL;
609 ssize_t ret;
610
611 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
612 return NULL;
613 }
614
615 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
616 return NULL;
617 }
618
619 do {
620 if (fsp->fh->fd != -1) {
621 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
622 pai_buf, pai_buf_size);
623 } else {
624 ret = SMB_VFS_GETXATTR(fsp->conn,
625 fsp->fsp_name->base_name,
626 SAMBA_POSIX_INHERITANCE_EA_NAME,
627 pai_buf, pai_buf_size);
628 }
629
630 if (ret == -1) {
631 if (errno != ERANGE) {
632 break;
633 }
634 /* Buffer too small - enlarge it. */
635 pai_buf_size *= 2;
636 SAFE_FREE(pai_buf);
637 if (pai_buf_size > 1024*1024) {
638 return NULL; /* Limit malloc to 1mb. */
639 }
640 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
641 return NULL;
642 }
643 } while (ret == -1);
644
645 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
646 (unsigned long)ret, fsp_str_dbg(fsp)));
647
648 if (ret == -1) {
649 /* No attribute or not supported. */
650 #if defined(ENOATTR)
651 if (errno != ENOATTR)
652 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
653 #else
654 if (errno != ENOSYS)
655 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
656 #endif
657 SAFE_FREE(pai_buf);
658 return NULL;
659 }
660
661 paiv = create_pai_val(pai_buf, ret);
662
663 if (paiv) {
664 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
665 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
666 }
667
668 SAFE_FREE(pai_buf);
669 return paiv;
670 }
671
672 /************************************************************************
673 Load the user.SAMBA_PAI attribute.
674 ************************************************************************/
675
676 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
677 const char *fname)
678 {
679 char *pai_buf;
680 size_t pai_buf_size = 1024;
681 struct pai_val *paiv = NULL;
682 ssize_t ret;
683
684 if (!lp_map_acl_inherit(SNUM(conn))) {
685 return NULL;
686 }
687
688 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
689 return NULL;
690 }
691
692 do {
693 ret = SMB_VFS_GETXATTR(conn, fname,
694 SAMBA_POSIX_INHERITANCE_EA_NAME,
695 pai_buf, pai_buf_size);
696
697 if (ret == -1) {
698 if (errno != ERANGE) {
699 break;
700 }
701 /* Buffer too small - enlarge it. */
702 pai_buf_size *= 2;
703 SAFE_FREE(pai_buf);
704 if (pai_buf_size > 1024*1024) {
705 return NULL; /* Limit malloc to 1mb. */
706 }
707 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
708 return NULL;
709 }
710 } while (ret == -1);
711
712 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
713
714 if (ret == -1) {
715 /* No attribute or not supported. */
716 #if defined(ENOATTR)
717 if (errno != ENOATTR)
718 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
719 #else
720 if (errno != ENOSYS)
721 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
722 #endif
723 SAFE_FREE(pai_buf);
724 return NULL;
725 }
726
727 paiv = create_pai_val(pai_buf, ret);
728
729 if (paiv) {
730 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
731 (unsigned int)paiv->sd_type,
732 fname));
733 }
734
735 SAFE_FREE(pai_buf);
736 return paiv;
737 }
738
739 /****************************************************************************
740 Functions to manipulate the internal ACE format.
741 ****************************************************************************/
742
743 /****************************************************************************
744 Count a linked list of canonical ACE entries.
745 ****************************************************************************/
746
747 static size_t count_canon_ace_list( canon_ace *l_head )
748 {
749 size_t count = 0;
750 canon_ace *ace;
751
752 for (ace = l_head; ace; ace = ace->next)
753 count++;
754
755 return count;
756 }
757
758 /****************************************************************************
759 Free a linked list of canonical ACE entries.
760 ****************************************************************************/
761
762 static void free_canon_ace_list( canon_ace *l_head )
763 {
764 canon_ace *list, *next;
765
766 for (list = l_head; list; list = next) {
767 next = list->next;
768 DLIST_REMOVE(l_head, list);
769 SAFE_FREE(list);
770 }
771 }
772
773 /****************************************************************************
774 Function to duplicate a canon_ace entry.
775 ****************************************************************************/
776
777 static canon_ace *dup_canon_ace( canon_ace *src_ace)
778 {
779 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
780
781 if (dst_ace == NULL)
782 return NULL;
783
784 *dst_ace = *src_ace;
785 dst_ace->prev = dst_ace->next = NULL;
786 return dst_ace;
787 }
788
789 /****************************************************************************
790 Print out a canon ace.
791 ****************************************************************************/
792
793 static void print_canon_ace(canon_ace *pace, int num)
794 {
795 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
796 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
797 if (pace->owner_type == UID_ACE) {
798 const char *u_name = uidtoname(pace->unix_ug.uid);
799 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
800 } else if (pace->owner_type == GID_ACE) {
801 char *g_name = gidtoname(pace->unix_ug.gid);
802 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
803 } else
804 dbgtext( "other ");
805 switch (pace->type) {
806 case SMB_ACL_USER:
807 dbgtext( "SMB_ACL_USER ");
808 break;
809 case SMB_ACL_USER_OBJ:
810 dbgtext( "SMB_ACL_USER_OBJ ");
811 break;
812 case SMB_ACL_GROUP:
813 dbgtext( "SMB_ACL_GROUP ");
814 break;
815 case SMB_ACL_GROUP_OBJ:
816 dbgtext( "SMB_ACL_GROUP_OBJ ");
817 break;
818 case SMB_ACL_OTHER:
819 dbgtext( "SMB_ACL_OTHER ");
820 break;
821 default:
822 dbgtext( "MASK " );
823 break;
824 }
825
826 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
827 dbgtext( "perms ");
828 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
829 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
830 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
831 }
832
833 /****************************************************************************
834 Print out a canon ace list.
835 ****************************************************************************/
836
837 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
838 {
839 int count = 0;
840
841 if( DEBUGLVL( 10 )) {
842 dbgtext( "print_canon_ace_list: %s\n", name );
843 for (;ace_list; ace_list = ace_list->next, count++)
844 print_canon_ace(ace_list, count );
845 }
846 }
847
848 /****************************************************************************
849 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
850 ****************************************************************************/
851
852 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
853 {
854 mode_t ret = 0;
855
856 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
857 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
858 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
859
860 return ret;
861 }
862
863 /****************************************************************************
864 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
865 ****************************************************************************/
866
867 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
868 {
869 mode_t ret = 0;
870
871 if (mode & r_mask)
872 ret |= S_IRUSR;
873 if (mode & w_mask)
874 ret |= S_IWUSR;
875 if (mode & x_mask)
876 ret |= S_IXUSR;
877
878 return ret;
879 }
880
881 /****************************************************************************
882 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
883 an SMB_ACL_PERMSET_T.
884 ****************************************************************************/
885
886 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
887 {
888 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
889 return -1;
890 if (mode & S_IRUSR) {
891 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
892 return -1;
893 }
894 if (mode & S_IWUSR) {
895 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
896 return -1;
897 }
898 if (mode & S_IXUSR) {
899 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
900 return -1;
901 }
902 return 0;
903 }
904
905 /****************************************************************************
906 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
907 ****************************************************************************/
908
909 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
910 {
911 uid_to_sid( powner_sid, psbuf->st_ex_uid );
912 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
913 }
914
915 /****************************************************************************
916 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
917 delete the second one. If the first is deny, mask the permissions off and delete the allow
918 if the permissions become zero, delete the deny if the permissions are non zero.
919 ****************************************************************************/
920
921 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
922 {
923 canon_ace *l_head = *pp_list_head;
924 canon_ace *curr_ace_outer;
925 canon_ace *curr_ace_outer_next;
926
927 /*
928 * First, merge allow entries with identical SIDs, and deny entries
929 * with identical SIDs.
930 */
931
932 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
933 canon_ace *curr_ace;
934 canon_ace *curr_ace_next;
935
936 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
937
938 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
939 bool can_merge = false;
940
941 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
942
943 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
944 * types are the same. For directory acls we must also
945 * ensure the POSIX ACL types are the same. */
946
947 if (!dir_acl) {
948 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949 (curr_ace->attr == curr_ace_outer->attr));
950 } else {
951 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
952 (curr_ace->type == curr_ace_outer->type) &&
953 (curr_ace->attr == curr_ace_outer->attr));
954 }
955
956 if (can_merge) {
957 if( DEBUGLVL( 10 )) {
958 dbgtext("merge_aces: Merging ACE's\n");
959 print_canon_ace( curr_ace_outer, 0);
960 print_canon_ace( curr_ace, 0);
961 }
962
963 /* Merge two allow or two deny ACE's. */
964
965 /* Theoretically we shouldn't merge a dir ACE if
966 * one ACE has the CI flag set, and the other
967 * ACE has the OI flag set, but this is rare
968 * enough we can ignore it. */
969
970 curr_ace_outer->perms |= curr_ace->perms;
971 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
972 DLIST_REMOVE(l_head, curr_ace);
973 SAFE_FREE(curr_ace);
974 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
975 }
976 }
977 }
978
979 /*
980 * Now go through and mask off allow permissions with deny permissions.
981 * We can delete either the allow or deny here as we know that each SID
982 * appears only once in the list.
983 */
984
985 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
986 canon_ace *curr_ace;
987 canon_ace *curr_ace_next;
988
989 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
990
991 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
992
993 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
994
995 /*
996 * Subtract ACE's with different entries. Due to the ordering constraints
997 * we've put on the ACL, we know the deny must be the first one.
998 */
999
1000 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003 if( DEBUGLVL( 10 )) {
1004 dbgtext("merge_aces: Masking ACE's\n");
1005 print_canon_ace( curr_ace_outer, 0);
1006 print_canon_ace( curr_ace, 0);
1007 }
1008
1009 curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011 if (curr_ace->perms == 0) {
1012
1013 /*
1014 * The deny overrides the allow. Remove the allow.
1015 */
1016
1017 DLIST_REMOVE(l_head, curr_ace);
1018 SAFE_FREE(curr_ace);
1019 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021 } else {
1022
1023 /*
1024 * Even after removing permissions, there
1025 * are still allow permissions - delete the deny.
1026 * It is safe to delete the deny here,
1027 * as we are guarenteed by the deny first
1028 * ordering that all the deny entries for
1029 * this SID have already been merged into one
1030 * before we can get to an allow ace.
1031 */
1032
1033 DLIST_REMOVE(l_head, curr_ace_outer);
1034 SAFE_FREE(curr_ace_outer);
1035 break;
1036 }
1037 }
1038
1039 } /* end for curr_ace */
1040 } /* end for curr_ace_outer */
1041
1042 /* We may have modified the list. */
1043
1044 *pp_list_head = l_head;
1045 }
1046
1047 /****************************************************************************
1048 Check if we need to return NT4.x compatible ACL entries.
1049 ****************************************************************************/
1050
1051 bool nt4_compatible_acls(void)
1052 {
1053 int compat = lp_acl_compatibility();
1054
1055 if (compat == ACL_COMPAT_AUTO) {
1056 enum remote_arch_types ra_type = get_remote_arch();
1057
1058 /* Automatically adapt to client */
1059 return (ra_type <= RA_WINNT);
1060 } else
1061 return (compat == ACL_COMPAT_WINNT);
1062 }
1063
1064
1065 /****************************************************************************
1066 Map canon_ace perms to permission bits NT.
1067 The attr element is not used here - we only process deny entries on set,
1068 not get. Deny entries are implicit on get with ace->perms = 0.
1069 ****************************************************************************/
1070
1071 uint32_t map_canon_ace_perms(int snum,
1072 enum security_ace_type *pacl_type,
1073 mode_t perms,
1074 bool directory_ace)
1075 {
1076 uint32_t nt_mask = 0;
1077
1078 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081 if (directory_ace) {
1082 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083 } else {
1084 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085 }
1086 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087 /*
1088 * Windows NT refuses to display ACEs with no permissions in them (but
1089 * they are perfectly legal with Windows 2000). If the ACE has empty
1090 * permissions we cannot use 0, so we use the otherwise unused
1091 * WRITE_OWNER permission, which we ignore when we set an ACL.
1092 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093 * to be changed in the future.
1094 */
1095
1096 if (nt4_compatible_acls())
1097 nt_mask = UNIX_ACCESS_NONE;
1098 else
1099 nt_mask = 0;
1100 } else {
1101 if (directory_ace) {
1102 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105 } else {
1106 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109 }
1110 }
1111
1112 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1114 }
1115
1116 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117 (unsigned int)perms, (unsigned int)nt_mask ));
1118
1119 return nt_mask;
1120 }
1121
1122 /****************************************************************************
1123 Map NT perms to a UNIX mode_t.
1124 ****************************************************************************/
1125
1126 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1127 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1128 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130 static mode_t map_nt_perms( uint32 *mask, int type)
1131 {
1132 mode_t mode = 0;
1133
1134 switch(type) {
1135 case S_IRUSR:
1136 if((*mask) & GENERIC_ALL_ACCESS)
1137 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1138 else {
1139 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142 }
1143 break;
1144 case S_IRGRP:
1145 if((*mask) & GENERIC_ALL_ACCESS)
1146 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1147 else {
1148 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151 }
1152 break;
1153 case S_IROTH:
1154 if((*mask) & GENERIC_ALL_ACCESS)
1155 mode = S_IROTH|S_IWOTH|S_IXOTH;
1156 else {
1157 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160 }
1161 break;
1162 }
1163
1164 return mode;
1165 }
1166
1167 /****************************************************************************
1168 Unpack a SEC_DESC into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172 {
1173 DOM_SID owner_sid;
1174 DOM_SID grp_sid;
1175
1176 *puser = (uid_t)-1;
1177 *pgrp = (gid_t)-1;
1178
1179 if(security_info_sent == 0) {
1180 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181 return NT_STATUS_OK;
1182 }
1183
1184 /*
1185 * Validate the owner and group SID's.
1186 */
1187
1188 memset(&owner_sid, '\0', sizeof(owner_sid));
1189 memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193 /*
1194 * Don't immediately fail if the owner sid cannot be validated.
1195 * This may be a group chown only set.
1196 */
1197
1198 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199 sid_copy(&owner_sid, psd->owner_sid);
1200 if (!sid_to_uid(&owner_sid, puser)) {
1201 if (lp_force_unknown_acl_user(snum)) {
1202 /* this allows take ownership to work
1203 * reasonably */
1204 *puser = current_user.ut.uid;
1205 } else {
1206 DEBUG(3,("unpack_nt_owners: unable to validate"
1207 " owner sid for %s\n",
1208 sid_string_dbg(&owner_sid)));
1209 return NT_STATUS_INVALID_OWNER;
1210 }
1211 }
1212 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213 (unsigned int)*puser ));
1214 }
1215
1216 /*
1217 * Don't immediately fail if the group sid cannot be validated.
1218 * This may be an owner chown only set.
1219 */
1220
1221 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222 sid_copy(&grp_sid, psd->group_sid);
1223 if (!sid_to_gid( &grp_sid, pgrp)) {
1224 if (lp_force_unknown_acl_user(snum)) {
1225 /* this allows take group ownership to work
1226 * reasonably */
1227 *pgrp = current_user.ut.gid;
1228 } else {
1229 DEBUG(3,("unpack_nt_owners: unable to validate"
1230 " group sid.\n"));
1231 return NT_STATUS_INVALID_OWNER;
1232 }
1233 }
1234 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235 (unsigned int)*pgrp));
1236 }
1237
1238 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240 return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244 Ensure the enforced permissions for this share apply.
1245 ****************************************************************************/
1246
1247 static void apply_default_perms(const struct share_params *params,
1248 const bool is_directory, canon_ace *pace,
1249 mode_t type)
1250 {
1251 mode_t and_bits = (mode_t)0;
1252 mode_t or_bits = (mode_t)0;
1253
1254 /* Get the initial bits to apply. */
1255
1256 if (is_directory) {
1257 and_bits = lp_dir_security_mask(params->service);
1258 or_bits = lp_force_dir_security_mode(params->service);
1259 } else {
1260 and_bits = lp_security_mask(params->service);
1261 or_bits = lp_force_security_mode(params->service);
1262 }
1263
1264 /* Now bounce them into the S_USR space. */
1265 switch(type) {
1266 case S_IRUSR:
1267 /* Ensure owner has read access. */
1268 pace->perms |= S_IRUSR;
1269 if (is_directory)
1270 pace->perms |= (S_IWUSR|S_IXUSR);
1271 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273 break;
1274 case S_IRGRP:
1275 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277 break;
1278 case S_IROTH:
1279 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281 break;
1282 }
1283
1284 pace->perms = ((pace->perms & and_bits)|or_bits);
1285 }
1286
1287 /****************************************************************************
1288 Check if a given uid/SID is in a group gid/SID. This is probably very
1289 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1290 ****************************************************************************/
1291
1292 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1293 {
1294 const char *u_name = NULL;
1295
1296 /* "Everyone" always matches every uid. */
1297
1298 if (sid_equal(&group_ace->trustee, &global_sid_World))
1299 return True;
1300
1301 /*
1302 * if it's the current user, we already have the unix token
1303 * and don't need to do the complex user_in_group_sid() call
1304 */
1305 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306 size_t i;
1307
1308 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309 return True;
1310 }
1311
1312 for (i=0; i < current_user.ut.ngroups; i++) {
1313 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314 return True;
1315 }
1316 }
1317 }
1318
1319 /* u_name talloc'ed off tos. */
1320 u_name = uidtoname(uid_ace->unix_ug.uid);
1321 if (!u_name) {
1322 return False;
1323 }
1324
1325 /*
1326 * user_in_group_sid() uses create_token_from_username()
1327 * which creates an artificial NT token given just a username,
1328 * so this is not reliable for users from foreign domains
1329 * exported by winbindd!
1330 */
1331 return user_in_group_sid(u_name, &group_ace->trustee);
1332 }
1333
1334 /****************************************************************************
1335 A well formed POSIX file or default ACL has at least 3 entries, a
1336 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337 In addition, the owner must always have at least read access.
1338 When using this call on get_acl, the pst struct is valid and contains
1339 the mode of the file. When using this call on set_acl, the pst struct has
1340 been modified to have a mode containing the default for this file or directory
1341 type.
1342 ****************************************************************************/
1343
1344 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345 const struct share_params *params,
1346 const bool is_directory,
1347 const DOM_SID *pfile_owner_sid,
1348 const DOM_SID *pfile_grp_sid,
1349 const SMB_STRUCT_STAT *pst,
1350 bool setting_acl)
1351 {
1352 canon_ace *pace;
1353 bool got_user = False;
1354 bool got_grp = False;
1355 bool got_other = False;
1356 canon_ace *pace_other = NULL;
1357
1358 for (pace = *pp_ace; pace; pace = pace->next) {
1359 if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361 if (setting_acl)
1362 apply_default_perms(params, is_directory, pace, S_IRUSR);
1363 got_user = True;
1364
1365 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367 /*
1368 * Ensure create mask/force create mode is respected on set.
1369 */
1370
1371 if (setting_acl)
1372 apply_default_perms(params, is_directory, pace, S_IRGRP);
1373 got_grp = True;
1374
1375 } else if (pace->type == SMB_ACL_OTHER) {
1376
1377 /*
1378 * Ensure create mask/force create mode is respected on set.
1379 */
1380
1381 if (setting_acl)
1382 apply_default_perms(params, is_directory, pace, S_IROTH);
1383 got_other = True;
1384 pace_other = pace;
1385 }
1386 }
1387
1388 if (!got_user) {
1389 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391 return False;
1392 }
1393
1394 ZERO_STRUCTP(pace);
1395 pace->type = SMB_ACL_USER_OBJ;
1396 pace->owner_type = UID_ACE;
1397 pace->unix_ug.uid = pst->st_ex_uid;
1398 pace->trustee = *pfile_owner_sid;
1399 pace->attr = ALLOW_ACE;
1400
1401 if (setting_acl) {
1402 /* See if the owning user is in any of the other groups in
1403 the ACE. If so, OR in the permissions from that group. */
1404
1405 bool group_matched = False;
1406 canon_ace *pace_iter;
1407
1408 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1410 if (uid_entry_in_group(pace, pace_iter)) {
1411 pace->perms |= pace_iter->perms;
1412 group_matched = True;
1413 }
1414 }
1415 }
1416
1417 /* If we only got an "everyone" perm, just use that. */
1418 if (!group_matched) {
1419 if (got_other)
1420 pace->perms = pace_other->perms;
1421 else
1422 pace->perms = 0;
1423 }
1424
1425 apply_default_perms(params, is_directory, pace, S_IRUSR);
1426 } else {
1427 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428 }
1429
1430 DLIST_ADD(*pp_ace, pace);
1431 }
1432
1433 if (!got_grp) {
1434 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436 return False;
1437 }
1438
1439 ZERO_STRUCTP(pace);
1440 pace->type = SMB_ACL_GROUP_OBJ;
1441 pace->owner_type = GID_ACE;
1442 pace->unix_ug.uid = pst->st_ex_gid;
1443 pace->trustee = *pfile_grp_sid;
1444 pace->attr = ALLOW_ACE;
1445 if (setting_acl) {
1446 /* If we only got an "everyone" perm, just use that. */
1447 if (got_other)
1448 pace->perms = pace_other->perms;
1449 else
1450 pace->perms = 0;
1451 apply_default_perms(params, is_directory, pace, S_IRGRP);
1452 } else {
1453 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454 }
1455
1456 DLIST_ADD(*pp_ace, pace);
1457 }
1458
1459 if (!got_other) {
1460 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462 return False;
1463 }
1464
1465 ZERO_STRUCTP(pace);
1466 pace->type = SMB_ACL_OTHER;
1467 pace->owner_type = WORLD_ACE;
1468 pace->unix_ug.world = -1;
1469 pace->trustee = global_sid_World;
1470 pace->attr = ALLOW_ACE;
1471 if (setting_acl) {
1472 pace->perms = 0;
1473 apply_default_perms(params, is_directory, pace, S_IROTH);
1474 } else
1475 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477 DLIST_ADD(*pp_ace, pace);
1478 }
1479
1480 return True;
1481 }
1482
1483 /****************************************************************************
1484 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485 If it does not have them, check if there are any entries where the trustee is the
1486 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487 ****************************************************************************/
1488
1489 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490 {
1491 bool got_user_obj, got_group_obj;
1492 canon_ace *current_ace;
1493 int i, entries;
1494
1495 entries = count_canon_ace_list(ace);
1496 got_user_obj = False;
1497 got_group_obj = False;
1498
1499 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500 if (current_ace->type == SMB_ACL_USER_OBJ)
1501 got_user_obj = True;
1502 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503 got_group_obj = True;
1504 }
1505 if (got_user_obj && got_group_obj) {
1506 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507 return;
1508 }
1509
1510 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513 current_ace->type = SMB_ACL_USER_OBJ;
1514 got_user_obj = True;
1515 }
1516 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518 current_ace->type = SMB_ACL_GROUP_OBJ;
1519 got_group_obj = True;
1520 }
1521 }
1522 if (!got_user_obj)
1523 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524 if (!got_group_obj)
1525 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526 }
1527
1528 /****************************************************************************
1529 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1530 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1531 ****************************************************************************/
1532
1533 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1534 {
1535 /* dir ace must be followings.
1536 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1537 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1538 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1539 Posix ACL u:trustee:perm
1540
1541 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1542 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1543 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1544 Posix ACL g:trustee:perm
1545 */
1546
1547 if (ace->type == SMB_ACL_USER_OBJ &&
1548 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1549 canon_ace *dup_ace = dup_canon_ace(ace);
1550
1551 if (dup_ace == NULL) {
1552 return false;
1553 }
1554 dup_ace->type = SMB_ACL_USER;
1555 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1556 }
1557
1558 if (ace->type == SMB_ACL_GROUP_OBJ &&
1559 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1560 canon_ace *dup_ace = dup_canon_ace(ace);
1561
1562 if (dup_ace == NULL) {
1563 return false;
1564 }
1565 dup_ace->type = SMB_ACL_GROUP;
1566 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1567 }
1568
1569 return true;
1570 }
1571
1572 /****************************************************************************
1573 Unpack a SEC_DESC into two canonical ace lists.
1574 ****************************************************************************/
1575
1576 static bool create_canon_ace_lists(files_struct *fsp,
1577 const SMB_STRUCT_STAT *pst,
1578 DOM_SID *pfile_owner_sid,
1579 DOM_SID *pfile_grp_sid,
1580 canon_ace **ppfile_ace,
1581 canon_ace **ppdir_ace,
1582 const SEC_ACL *dacl)
1583 {
1584 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1585 canon_ace *file_ace = NULL;
1586 canon_ace *dir_ace = NULL;
1587 canon_ace *current_ace = NULL;
1588 bool got_dir_allow = False;
1589 bool got_file_allow = False;
1590 int i, j;
1591
1592 *ppfile_ace = NULL;
1593 *ppdir_ace = NULL;
1594
1595 /*
1596 * Convert the incoming ACL into a more regular form.
1597 */
1598
1599 for(i = 0; i < dacl->num_aces; i++) {
1600 SEC_ACE *psa = &dacl->aces[i];
1601
1602 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1603 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1604 return False;
1605 }
1606
1607 if (nt4_compatible_acls()) {
1608 /*
1609 * The security mask may be UNIX_ACCESS_NONE which should map into
1610 * no permissions (we overload the WRITE_OWNER bit for this) or it
1611 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1612 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1613 */
1614
1615 /*
1616 * Convert GENERIC bits to specific bits.
1617 */
1618
1619 se_map_generic(&psa->access_mask, &file_generic_mapping);
1620
1621 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1622
1623 if(psa->access_mask != UNIX_ACCESS_NONE)
1624 psa->access_mask &= ~UNIX_ACCESS_NONE;
1625 }
1626 }
1627
1628 /*
1629 * Deal with the fact that NT 4.x re-writes the canonical format
1630 * that we return for default ACLs. If a directory ACE is identical
1631 * to a inherited directory ACE then NT changes the bits so that the
1632 * first ACE is set to OI|IO and the second ACE for this SID is set
1633 * to CI. We need to repair this. JRA.
1634 */
1635
1636 for(i = 0; i < dacl->num_aces; i++) {
1637 SEC_ACE *psa1 = &dacl->aces[i];
1638
1639 for (j = i + 1; j < dacl->num_aces; j++) {
1640 SEC_ACE *psa2 = &dacl->aces[j];
1641
1642 if (psa1->access_mask != psa2->access_mask)
1643 continue;
1644
1645 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1646 continue;
1647
1648 /*
1649 * Ok - permission bits and SIDs are equal.
1650 * Check if flags were re-written.
1651 */
1652
1653 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1654
1655 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1656 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1657
1658 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1661 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663 }
1664 }
1665 }
1666
1667 for(i = 0; i < dacl->num_aces; i++) {
1668 SEC_ACE *psa = &dacl->aces[i];
1669
1670 /*
1671 * Create a cannon_ace entry representing this NT DACL ACE.
1672 */
1673
1674 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1675 free_canon_ace_list(file_ace);
1676 free_canon_ace_list(dir_ace);
1677 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1678 return False;
1679 }
1680
1681 ZERO_STRUCTP(current_ace);
1682
1683 sid_copy(&current_ace->trustee, &psa->trustee);
1684
1685 /*
1686 * Try and work out if the SID is a user or group
1687 * as we need to flag these differently for POSIX.
1688 * Note what kind of a POSIX ACL this should map to.
1689 */
1690
1691 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1692 current_ace->owner_type = WORLD_ACE;
1693 current_ace->unix_ug.world = -1;
1694 current_ace->type = SMB_ACL_OTHER;
1695 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1696 current_ace->owner_type = UID_ACE;
1697 current_ace->unix_ug.uid = pst->st_ex_uid;
1698 current_ace->type = SMB_ACL_USER_OBJ;
1699
1700 /*
1701 * The Creator Owner entry only specifies inheritable permissions,
1702 * never access permissions. WinNT doesn't always set the ACE to
1703 * INHERIT_ONLY, though.
1704 */
1705
1706 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1707
1708 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1709 current_ace->owner_type = GID_ACE;
1710 current_ace->unix_ug.gid = pst->st_ex_gid;
1711 current_ace->type = SMB_ACL_GROUP_OBJ;
1712
1713 /*
1714 * The Creator Group entry only specifies inheritable permissions,
1715 * never access permissions. WinNT doesn't always set the ACE to
1716 * INHERIT_ONLY, though.
1717 */
1718 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1721 current_ace->owner_type = UID_ACE;
1722 /* If it's the owning user, this is a user_obj, not
1723 * a user. */
1724 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1725 current_ace->type = SMB_ACL_USER_OBJ;
1726 } else {
1727 current_ace->type = SMB_ACL_USER;
1728 }
1729 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1730 current_ace->owner_type = GID_ACE;
1731 /* If it's the primary group, this is a group_obj, not
1732 * a group. */
1733 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1734 current_ace->type = SMB_ACL_GROUP_OBJ;
1735 } else {
1736 current_ace->type = SMB_ACL_GROUP;
1737 }
1738 } else {
1739 /*
1740 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1741 */
1742
1743 if (non_mappable_sid(&psa->trustee)) {
1744 DEBUG(10, ("create_canon_ace_lists: ignoring "
1745 "non-mappable SID %s\n",
1746 sid_string_dbg(&psa->trustee)));
1747 SAFE_FREE(current_ace);
1748 continue;
1749 }
1750
1751 free_canon_ace_list(file_ace);
1752 free_canon_ace_list(dir_ace);
1753 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1754 "%s to uid or gid.\n",
1755 sid_string_dbg(&current_ace->trustee)));
1756 SAFE_FREE(current_ace);
1757 return False;
1758 }
1759
1760 /*
1761 * Map the given NT permissions into a UNIX mode_t containing only
1762 * S_I(R|W|X)USR bits.
1763 */
1764
1765 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1766 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1767
1768 /* Store the ace_flag. */
1769 current_ace->ace_flags = psa->flags;
1770
1771 /*
1772 * Now add the created ace to either the file list, the directory
1773 * list, or both. We *MUST* preserve the order here (hence we use
1774 * DLIST_ADD_END) as NT ACLs are order dependent.
1775 */
1776
1777 if (fsp->is_directory) {
1778
1779 /*
1780 * We can only add to the default POSIX ACE list if the ACE is
1781 * designed to be inherited by both files and directories.
1782 */
1783
1784 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1785 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1786
1787 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1788
1789 /*
1790 * Note if this was an allow ace. We can't process
1791 * any further deny ace's after this.
1792 */
1793
1794 if (current_ace->attr == ALLOW_ACE)
1795 got_dir_allow = True;
1796
1797 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1798 DEBUG(0,("create_canon_ace_lists: "
1799 "malformed ACL in "
1800 "inheritable ACL! Deny entry "
1801 "after Allow entry. Failing "
1802 "to set on file %s.\n",
1803 fsp_str_dbg(fsp)));
1804 free_canon_ace_list(file_ace);
1805 free_canon_ace_list(dir_ace);
1806 return False;
1807 }
1808
1809 if( DEBUGLVL( 10 )) {
1810 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1811 print_canon_ace( current_ace, 0);
1812 }
1813
1814 /*
1815 * We have a lossy mapping: directory ACE entries
1816 * CREATOR_OWNER ------\
1817 * (map to) +---> SMB_ACL_USER_OBJ
1818 * owning sid ------/
1819 *
1820 * CREATOR_GROUP ------\
1821 * (map to) +---> SMB_ACL_GROUP_OBJ
1822 * primary group sid --/
1823 *
1824 * on set. And on read of a directory ACL
1825 *
1826 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1827 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1828 *
1829 * Deal with this on set by duplicating
1830 * owning sid and primary group sid ACE
1831 * entries into the directory ACL.
1832 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1833 */
1834
1835 if (!dup_owning_ace(dir_ace, current_ace)) {
1836 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1837 free_canon_ace_list(file_ace);
1838 free_canon_ace_list(dir_ace);
1839 return false;
1840 }
1841
1842 /*
1843 * If this is not an inherit only ACE we need to add a duplicate
1844 * to the file acl.
1845 */
1846
1847 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1848 canon_ace *dup_ace = dup_canon_ace(current_ace);
1849
1850 if (!dup_ace) {
1851 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1852 free_canon_ace_list(file_ace);
1853 free_canon_ace_list(dir_ace);
1854 return False;
1855 }
1856
1857 /*
1858 * We must not free current_ace here as its
1859 * pointer is now owned by the dir_ace list.
1860 */
1861 current_ace = dup_ace;
1862 /* We've essentially split this ace into two,
1863 * and added the ace with inheritance request
1864 * bits to the directory ACL. Drop those bits for
1865 * the ACE we're adding to the file list. */
1866 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1867 SEC_ACE_FLAG_CONTAINER_INHERIT|
1868 SEC_ACE_FLAG_INHERIT_ONLY);
1869 } else {
1870 /*
1871 * We must not free current_ace here as its
1872 * pointer is now owned by the dir_ace list.
1873 */
1874 current_ace = NULL;
1875 }
1876 }
1877 }
1878
1879 /*
1880 * Only add to the file ACL if not inherit only.
1881 */
1882
1883 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1884 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1885
1886 /*
1887 * Note if this was an allow ace. We can't process
1888 * any further deny ace's after this.
1889 */
1890
1891 if (current_ace->attr == ALLOW_ACE)
1892 got_file_allow = True;
1893
1894 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1895 DEBUG(0,("create_canon_ace_lists: malformed "
1896 "ACL in file ACL ! Deny entry after "
1897 "Allow entry. Failing to set on file "
1898 "%s.\n", fsp_str_dbg(fsp)));
1899 free_canon_ace_list(file_ace);
1900 free_canon_ace_list(dir_ace);
1901 return False;
1902 }
1903
1904 if( DEBUGLVL( 10 )) {
1905 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1906 print_canon_ace( current_ace, 0);
1907 }
1908 all_aces_are_inherit_only = False;
1909 /*
1910 * We must not free current_ace here as its
1911 * pointer is now owned by the file_ace list.
1912 */
1913 current_ace = NULL;
1914 }
1915
1916 /*
1917 * Free if ACE was not added.
1918 */
1919
1920 SAFE_FREE(current_ace);
1921 }
1922
1923 if (fsp->is_directory && all_aces_are_inherit_only) {
1924 /*
1925 * Windows 2000 is doing one of these weird 'inherit acl'
1926 * traverses to conserve NTFS ACL resources. Just pretend
1927 * there was no DACL sent. JRA.
1928 */
1929
1930 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1931 free_canon_ace_list(file_ace);
1932 free_canon_ace_list(dir_ace);
1933 file_ace = NULL;
1934 dir_ace = NULL;
1935 } else {
1936 /*
1937 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1938 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1939 * entries can be converted to *_OBJ. Usually we will already have these
1940 * entries in the Default ACL, and the Access ACL will not have them.
1941 */
1942 if (file_ace) {
1943 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1944 }
1945 if (dir_ace) {
1946 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1947 }
1948 }
1949
1950 *ppfile_ace = file_ace;
1951 *ppdir_ace = dir_ace;
1952
1953 return True;
1954 }
1955
1956 /****************************************************************************
1957 ASCII art time again... JRA :-).
1958
1959 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1960 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1961 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1962 allow or deny have been merged, so the same SID can only appear once in the deny
1963 list or once in the allow list.
1964
1965 We then process as follows :
1966
1967 ---------------------------------------------------------------------------
1968 First pass - look for a Everyone DENY entry.
1969
1970 If it is deny all (rwx) trunate the list at this point.
1971 Else, walk the list from this point and use the deny permissions of this
1972 entry as a mask on all following allow entries. Finally, delete
1973 the Everyone DENY entry (we have applied it to everything possible).
1974
1975 In addition, in this pass we remove any DENY entries that have
1976 no permissions (ie. they are a DENY nothing).
1977 ---------------------------------------------------------------------------
1978 Second pass - only deal with deny user entries.
1979
1980 DENY user1 (perms XXX)
1981
1982 new_perms = 0
1983 for all following allow group entries where user1 is in group
1984 new_perms |= group_perms;
1985
1986 user1 entry perms = new_perms & ~ XXX;
1987
1988 Convert the deny entry to an allow entry with the new perms and
1989 push to the end of the list. Note if the user was in no groups
1990 this maps to a specific allow nothing entry for this user.
1991
1992 The common case from the NT ACL choser (userX deny all) is
1993 optimised so we don't do the group lookup - we just map to
1994 an allow nothing entry.
1995
1996 What we're doing here is inferring the allow permissions the
1997 person setting the ACE on user1 wanted by looking at the allow
1998 permissions on the groups the user is currently in. This will
1999 be a snapshot, depending on group membership but is the best
2000 we can do and has the advantage of failing closed rather than
2001 open.
2002 ---------------------------------------------------------------------------
2003 Third pass - only deal with deny group entries.
2004
2005 DENY group1 (perms XXX)
2006
2007 for all following allow user entries where user is in group1
2008 user entry perms = user entry perms & ~ XXX;
2009
2010 If there is a group Everyone allow entry with permissions YYY,
2011 convert the group1 entry to an allow entry and modify its
2012 permissions to be :
2013
2014 new_perms = YYY & ~ XXX
2015
2016 and push to the end of the list.
2017
2018 If there is no group Everyone allow entry then convert the
2019 group1 entry to a allow nothing entry and push to the end of the list.
2020
2021 Note that the common case from the NT ACL choser (groupX deny all)
2022 cannot be optimised here as we need to modify user entries who are
2023 in the group to change them to a deny all also.
2024
2025 What we're doing here is modifying the allow permissions of
2026 user entries (which are more specific in POSIX ACLs) to mask
2027 out the explicit deny set on the group they are in. This will
2028 be a snapshot depending on current group membership but is the
2029 best we can do and has the advantage of failing closed rather
2030 than open.
2031 ---------------------------------------------------------------------------
2032 Fourth pass - cope with cumulative permissions.
2033
2034 for all allow user entries, if there exists an allow group entry with
2035 more permissive permissions, and the user is in that group, rewrite the
2036 allow user permissions to contain both sets of permissions.
2037
2038 Currently the code for this is #ifdef'ed out as these semantics make
2039 no sense to me. JRA.
2040 ---------------------------------------------------------------------------
2041
2042 Note we *MUST* do the deny user pass first as this will convert deny user
2043 entries into allow user entries which can then be processed by the deny
2044 group pass.
2045
2046 The above algorithm took a *lot* of thinking about - hence this
2047 explaination :-). JRA.
2048 ****************************************************************************/
2049
2050 /****************************************************************************
2051 Process a canon_ace list entries. This is very complex code. We need
2052 to go through and remove the "deny" permissions from any allow entry that matches
2053 the id of this entry. We have already refused any NT ACL that wasn't in correct
2054 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2055 we just remove it (to fail safe). We have already removed any duplicate ace
2056 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2057 allow entries.
2058 ****************************************************************************/
2059
2060 static void process_deny_list( canon_ace **pp_ace_list )
2061 {
2062 canon_ace *ace_list = *pp_ace_list;
2063 canon_ace *curr_ace = NULL;
2064 canon_ace *curr_ace_next = NULL;
2065
2066 /* Pass 1 above - look for an Everyone, deny entry. */
2067
2068 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2069 canon_ace *allow_ace_p;
2070
2071 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2072
2073 if (curr_ace->attr != DENY_ACE)
2074 continue;
2075
2076 if (curr_ace->perms == (mode_t)0) {
2077
2078 /* Deny nothing entry - delete. */
2079
2080 DLIST_REMOVE(ace_list, curr_ace);
2081 continue;
2082 }
2083
2084 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2085 continue;
2086
2087 /* JRATEST - assert. */
2088 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2089
2090 if (curr_ace->perms == ALL_ACE_PERMS) {
2091
2092 /*
2093 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2094 * list at this point including this entry.
2095 */
2096
2097 canon_ace *prev_entry = curr_ace->prev;
2098
2099 free_canon_ace_list( curr_ace );
2100 if (prev_entry)
2101 prev_entry->next = NULL;
2102 else {
2103 /* We deleted the entire list. */
2104 ace_list = NULL;
2105 }
2106 break;
2107 }
2108
2109 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2110
2111 /*
2112 * Only mask off allow entries.
2113 */
2114
2115 if (allow_ace_p->attr != ALLOW_ACE)
2116 continue;
2117
2118 allow_ace_p->perms &= ~curr_ace->perms;
2119 }
2120
2121 /*
2122 * Now it's been applied, remove it.
2123 */
2124
2125 DLIST_REMOVE(ace_list, curr_ace);
2126 }
2127
2128 /* Pass 2 above - deal with deny user entries. */
2129
2130 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2131 mode_t new_perms = (mode_t)0;
2132 canon_ace *allow_ace_p;
2133
2134 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2135
2136 if (curr_ace->attr != DENY_ACE)
2137 continue;
2138
2139 if (curr_ace->owner_type != UID_ACE)
2140 continue;
2141
2142 if (curr_ace->perms == ALL_ACE_PERMS) {
2143
2144 /*
2145 * Optimisation - this is a deny everything to this user.
2146 * Convert to an allow nothing and push to the end of the list.
2147 */
2148
2149 curr_ace->attr = ALLOW_ACE;
2150 curr_ace->perms = (mode_t)0;
2151 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2152 continue;
2153 }
2154
2155 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2156
2157 if (allow_ace_p->attr != ALLOW_ACE)
2158 continue;
2159
2160 /* We process GID_ACE and WORLD_ACE entries only. */
2161
2162 if (allow_ace_p->owner_type == UID_ACE)
2163 continue;
2164
2165 if (uid_entry_in_group( curr_ace, allow_ace_p))
2166 new_perms |= allow_ace_p->perms;
2167 }
2168
2169 /*
2170 * Convert to a allow entry, modify the perms and push to the end
2171 * of the list.
2172 */
2173
2174 curr_ace->attr = ALLOW_ACE;
2175 curr_ace->perms = (new_perms & ~curr_ace->perms);
2176 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2177 }
2178
2179 /* Pass 3 above - deal with deny group entries. */
2180
2181 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182 canon_ace *allow_ace_p;
2183 canon_ace *allow_everyone_p = NULL;
2184
2185 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187 if (curr_ace->attr != DENY_ACE)
2188 continue;
2189
2190 if (curr_ace->owner_type != GID_ACE)
2191 continue;
2192
2193 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2194
2195 if (allow_ace_p->attr != ALLOW_ACE)
2196 continue;
2197
2198 /* Store a pointer to the Everyone allow, if it exists. */
2199 if (allow_ace_p->owner_type == WORLD_ACE)
2200 allow_everyone_p = allow_ace_p;
2201
2202 /* We process UID_ACE entries only. */
2203
2204 if (allow_ace_p->owner_type != UID_ACE)
2205 continue;
2206
2207 /* Mask off the deny group perms. */
2208
2209 if (uid_entry_in_group( allow_ace_p, curr_ace))
2210 allow_ace_p->perms &= ~curr_ace->perms;
2211 }
2212
2213 /*
2214 * Convert the deny to an allow with the correct perms and
2215 * push to the end of the list.
2216 */
2217
2218 curr_ace->attr = ALLOW_ACE;
2219 if (allow_everyone_p)
2220 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2221 else
2222 curr_ace->perms = (mode_t)0;
2223 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2224 }
2225
2226 /* Doing this fourth pass allows Windows semantics to be layered
2227 * on top of POSIX semantics. I'm not sure if this is desirable.
2228 * For example, in W2K ACLs there is no way to say, "Group X no
2229 * access, user Y full access" if user Y is a member of group X.
2230 * This seems completely broken semantics to me.... JRA.
2231 */
2232
2233 #if 0
2234 /* Pass 4 above - deal with allow entries. */
2235
2236 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2237 canon_ace *allow_ace_p;
2238
2239 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2240
2241 if (curr_ace->attr != ALLOW_ACE)
2242 continue;
2243
2244 if (curr_ace->owner_type != UID_ACE)
2245 continue;
2246
2247 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2248
2249 if (allow_ace_p->attr != ALLOW_ACE)
2250 continue;
2251
2252 /* We process GID_ACE entries only. */
2253
2254 if (allow_ace_p->owner_type != GID_ACE)
2255 continue;
2256
2257 /* OR in the group perms. */
2258
2259 if (uid_entry_in_group( curr_ace, allow_ace_p))
2260 curr_ace->perms |= allow_ace_p->perms;
2261 }
2262 }
2263 #endif
2264
2265 *pp_ace_list = ace_list;
2266 }
2267
2268 /****************************************************************************
2269 Create a default mode that will be used if a security descriptor entry has
2270 no user/group/world entries.
2271 ****************************************************************************/
2272
2273 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2274 {
2275 int snum = SNUM(fsp->conn);
2276 mode_t and_bits = (mode_t)0;
2277 mode_t or_bits = (mode_t)0;
2278 mode_t mode;
2279
2280 if (interitable_mode) {
2281 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2282 fsp->fsp_name, NULL);
2283 } else {
2284 mode = S_IRUSR;
2285 }
2286
2287 if (fsp->is_directory)
2288 mode |= (S_IWUSR|S_IXUSR);
2289
2290 /*
2291 * Now AND with the create mode/directory mode bits then OR with the
2292 * force create mode/force directory mode bits.
2293 */
2294
2295 if (fsp->is_directory) {
2296 and_bits = lp_dir_security_mask(snum);
2297 or_bits = lp_force_dir_security_mode(snum);
2298 } else {
2299 and_bits = lp_security_mask(snum);
2300 or_bits = lp_force_security_mode(snum);
2301 }
2302
2303 return ((mode & and_bits)|or_bits);
2304 }
2305
2306 /****************************************************************************
2307 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2308 succeeding.
2309 ****************************************************************************/
2310
2311 static bool unpack_canon_ace(files_struct *fsp,
2312 const SMB_STRUCT_STAT *pst,
2313 DOM_SID *pfile_owner_sid,
2314 DOM_SID *pfile_grp_sid,
2315 canon_ace **ppfile_ace,
2316 canon_ace **ppdir_ace,
2317 uint32 security_info_sent,
2318 const SEC_DESC *psd)
2319 {
2320 SMB_STRUCT_STAT st;
2321 canon_ace *file_ace = NULL;
2322 canon_ace *dir_ace = NULL;
2323
2324 *ppfile_ace = NULL;
2325 *ppdir_ace = NULL;
2326
2327 if(security_info_sent == 0) {
2328 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2329 return False;
2330 }
2331
2332 /*
2333 * If no DACL then this is a chown only security descriptor.
2334 */
2335
2336 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2337 return True;
2338
2339 /*
2340 * Now go through the DACL and create the canon_ace lists.
2341 */
2342
2343 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2344 &file_ace, &dir_ace, psd->dacl))
2345 return False;
2346
2347 if ((file_ace == NULL) && (dir_ace == NULL)) {
2348 /* W2K traverse DACL set - ignore. */
2349 return True;
2350 }
2351
2352 /*
2353 * Go through the canon_ace list and merge entries
2354 * belonging to identical users of identical allow or deny type.
2355 * We can do this as all deny entries come first, followed by
2356 * all allow entries (we have mandated this before accepting this acl).
2357 */
2358
2359 print_canon_ace_list( "file ace - before merge", file_ace);
2360 merge_aces( &file_ace, false);
2361
2362 print_canon_ace_list( "dir ace - before merge", dir_ace);
2363 merge_aces( &dir_ace, true);
2364
2365 /*
2366 * NT ACLs are order dependent. Go through the acl lists and
2367 * process DENY entries by masking the allow entries.
2368 */
2369
2370 print_canon_ace_list( "file ace - before deny", file_ace);
2371 process_deny_list( &file_ace);
2372
2373 print_canon_ace_list( "dir ace - before deny", dir_ace);
2374 process_deny_list( &dir_ace);
2375
2376 /*
2377 * A well formed POSIX file or default ACL has at least 3 entries, a
2378 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2379 * and optionally a mask entry. Ensure this is the case.
2380 */
2381
2382 print_canon_ace_list( "file ace - before valid", file_ace);
2383
2384 st = *pst;
2385
2386 /*
2387 * A default 3 element mode entry for a file should be r-- --- ---.
2388 * A default 3 element mode entry for a directory should be rwx --- ---.
2389 */
2390
2391 st.st_ex_mode = create_default_mode(fsp, False);
2392
2393 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2394 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2395 free_canon_ace_list(file_ace);
2396 free_canon_ace_list(dir_ace);
2397 return False;
2398 }
2399
2400 print_canon_ace_list( "dir ace - before valid", dir_ace);
2401
2402 /*
2403 * A default inheritable 3 element mode entry for a directory should be the
2404 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2405 * it's a directory.
2406 */
2407
2408 st.st_ex_mode = create_default_mode(fsp, True);
2409
2410 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2411 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2412 free_canon_ace_list(file_ace);
2413 free_canon_ace_list(dir_ace);
2414 return False;
2415 }
2416
2417 print_canon_ace_list( "file ace - return", file_ace);
2418 print_canon_ace_list( "dir ace - return", dir_ace);
2419
2420 *ppfile_ace = file_ace;
2421 *ppdir_ace = dir_ace;
2422 return True;
2423
2424 }
2425
2426 /******************************************************************************
2427 When returning permissions, try and fit NT display
2428 semantics if possible. Note the the canon_entries here must have been malloced.
2429 The list format should be - first entry = owner, followed by group and other user
2430 entries, last entry = other.
2431
2432 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2433 are not ordered, and match on the most specific entry rather than walking a list,
2434 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2435
2436 Entry 0: owner : deny all except read and write.
2437 Entry 1: owner : allow read and write.
2438 Entry 2: group : deny all except read.
2439 Entry 3: group : allow read.
2440 Entry 4: Everyone : allow read.
2441
2442 But NT cannot display this in their ACL editor !
2443 ********************************************************************************/
2444
2445 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2446 {
2447 canon_ace *l_head = *pp_list_head;
2448 canon_ace *owner_ace = NULL;
2449 canon_ace *other_ace = NULL;
2450 canon_ace *ace = NULL;
2451
2452 for (ace = l_head; ace; ace = ace->next) {
2453 if (ace->type == SMB_ACL_USER_OBJ)
2454 owner_ace = ace;
2455 else if (ace->type == SMB_ACL_OTHER) {
2456 /* Last ace - this is "other" */
2457 other_ace = ace;
2458 }
2459 }
2460
2461 if (!owner_ace || !other_ace) {
2462 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2463 filename ));
2464 return;
2465 }
2466
2467 /*
2468 * The POSIX algorithm applies to owner first, and other last,
2469 * so ensure they are arranged in this order.
2470 */
2471
2472 if (owner_ace) {
2473 DLIST_PROMOTE(l_head, owner_ace);
2474 }
2475
2476 if (other_ace) {
2477 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2478 }
2479
2480 /* We have probably changed the head of the list. */
2481
2482 *pp_list_head = l_head;
2483 }
2484
2485 /****************************************************************************
2486 Create a linked list of canonical ACE entries.
2487 ****************************************************************************/
2488
2489 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2490 const char *fname, SMB_ACL_T posix_acl,
2491 const SMB_STRUCT_STAT *psbuf,
2492 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2493 {
2494 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2495 canon_ace *l_head = NULL;
2496 canon_ace *ace = NULL;
2497 canon_ace *next_ace = NULL;
2498 int entry_id = SMB_ACL_FIRST_ENTRY;
2499 SMB_ACL_ENTRY_T entry;
2500 size_t ace_count;
2501
2502 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2503 SMB_ACL_TAG_T tagtype;
2504 SMB_ACL_PERMSET_T permset;
2505 DOM_SID sid;
2506 posix_id unix_ug;
2507 enum ace_owner owner_type;
2508
2509 entry_id = SMB_ACL_NEXT_ENTRY;
2510
2511 /* Is this a MASK entry ? */
2512 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2513 continue;
2514
2515 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2516 continue;
2517
2518 /* Decide which SID to use based on the ACL type. */
2519 switch(tagtype) {
2520 case SMB_ACL_USER_OBJ:
2521 /* Get the SID from the owner. */
2522 sid_copy(&sid, powner);
2523 unix_ug.uid = psbuf->st_ex_uid;
2524 owner_type = UID_ACE;
2525 break;
2526 case SMB_ACL_USER:
2527 {
2528 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2529 if (puid == NULL) {
2530 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2531 continue;
2532 }
2533 uid_to_sid( &sid, *puid);
2534 unix_ug.uid = *puid;
2535 owner_type = UID_ACE;
2536 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2537 break;
2538 }
2539 case SMB_ACL_GROUP_OBJ:
2540 /* Get the SID from the owning group. */
2541 sid_copy(&sid, pgroup);
2542 unix_ug.gid = psbuf->st_ex_gid;
2543 owner_type = GID_ACE;
2544 break;
2545 case SMB_ACL_GROUP:
2546 {
2547 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2548 if (pgid == NULL) {
2549 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2550 continue;
2551 }
2552 gid_to_sid( &sid, *pgid);
2553 unix_ug.gid = *pgid;
2554 owner_type = GID_ACE;
2555 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2556 break;
2557 }
2558 case SMB_ACL_MASK:
2559 acl_mask = convert_permset_to_mode_t(conn, permset);
2560 continue; /* Don't count the mask as an entry. */
2561 case SMB_ACL_OTHER:
2562 /* Use the Everyone SID */
2563 sid = global_sid_World;
2564 unix_ug.world = -1;
2565 owner_type = WORLD_ACE;
2566 break;
2567 default:
2568 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2569 continue;
2570 }
2571
2572 /*
2573 * Add this entry to the list.
2574 */
2575
2576 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2577 goto fail;
2578
2579 ZERO_STRUCTP(ace);
2580 ace->type = tagtype;
2581 ace->perms = convert_permset_to_mode_t(conn, permset);
2582 ace->attr = ALLOW_ACE;
2583 ace->trustee = sid;
2584 ace->unix_ug = unix_ug;
2585 ace->owner_type = owner_type;
2586 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2587
2588 DLIST_ADD(l_head, ace);
2589 }
2590
2591 /*
2592 * This next call will ensure we have at least a user/group/world set.
2593 */
2594
2595 if (!ensure_canon_entry_valid(&l_head, conn->params,
2596 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2597 psbuf, False))
2598 goto fail;
2599
2600 /*
2601 * Now go through the list, masking the permissions with the
2602 * acl_mask. Ensure all DENY Entries are at the start of the list.
2603 */
2604
2605 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2606
2607 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2608 next_ace = ace->next;
2609
2610 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2611 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2612 ace->perms &= acl_mask;
2613
2614 if (ace->perms == 0) {
2615 DLIST_PROMOTE(l_head, ace);
2616 }
2617
2618 if( DEBUGLVL( 10 ) ) {
2619 print_canon_ace(ace, ace_count);
2620 }
2621 }
2622
2623 arrange_posix_perms(fname,&l_head );
2624
2625 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2626
2627 return l_head;
2628
2629 fail:
2630
2631 free_canon_ace_list(l_head);
2632 return NULL;
2633 }
2634
2635 /****************************************************************************
2636 Check if the current user group list contains a given group.
2637 ****************************************************************************/
2638
2639 static bool current_user_in_group(gid_t gid)
2640 {
2641 int i;
2642
2643 for (i = 0; i < current_user.ut.ngroups; i++) {
2644 if (current_user.ut.groups[i] == gid) {
2645 return True;
2646 }
2647 }
2648
2649 return False;
2650 }
2651
2652 /****************************************************************************
2653 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2654 ****************************************************************************/
2655
2656 static bool acl_group_override(connection_struct *conn,
2657 const struct smb_filename *smb_fname)
2658 {
2659 if ((errno != EPERM) && (errno != EACCES)) {
2660 return false;
2661 }
2662
2663 /* file primary group == user primary or supplementary group */
2664 if (lp_acl_group_control(SNUM(conn)) &&
2665 current_user_in_group(smb_fname->st.st_ex_gid)) {
2666 return true;
2667 }
2668
2669 /* user has writeable permission */
2670 if (lp_dos_filemode(SNUM(conn)) &&
2671 can_write_to_file(conn, smb_fname)) {
2672 return true;
2673 }
2674
2675 return false;
2676 }
2677
2678 /****************************************************************************
2679 Attempt to apply an ACL to a file or directory.
2680 ****************************************************************************/
2681
2682 static bool set_canon_ace_list(files_struct *fsp,
2683 canon_ace *the_ace,
2684 bool default_ace,
2685 const SMB_STRUCT_STAT *psbuf,
2686 bool *pacl_set_support)
2687 {
2688 connection_struct *conn = fsp->conn;
2689 bool ret = False;
2690 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2691 canon_ace *p_ace;
2692 int i;
2693 SMB_ACL_ENTRY_T mask_entry;
2694 bool got_mask_entry = False;
2695 SMB_ACL_PERMSET_T mask_permset;
2696 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2697 bool needs_mask = False;
2698 mode_t mask_perms = 0;
2699
2700 /* Use the psbuf that was passed in. */
2701 if (psbuf != &fsp->fsp_name->st) {
2702 fsp->fsp_name->st = *psbuf;
2703 }
2704
2705 #if defined(POSIX_ACL_NEEDS_MASK)
2706 /* HP-UX always wants to have a mask (called "class" there). */
2707 needs_mask = True;
2708 #endif
2709
2710 if (the_acl == NULL) {
2711
2712 if (!no_acl_syscall_error(errno)) {
2713 /*
2714 * Only print this error message if we have some kind of ACL
2715 * support that's not working. Otherwise we would always get this.
2716 */
2717 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2718 default_ace ? "default" : "file", strerror(errno) ));
2719 }
2720 *pacl_set_support = False;
2721 goto fail;
2722 }
2723
2724 if( DEBUGLVL( 10 )) {
2725 dbgtext("set_canon_ace_list: setting ACL:\n");
2726 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2727 print_canon_ace( p_ace, i);
2728 }
2729 }
2730
2731 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2732 SMB_ACL_ENTRY_T the_entry;
2733 SMB_ACL_PERMSET_T the_permset;
2734
2735 /*
2736 * ACLs only "need" an ACL_MASK entry if there are any named user or
2737 * named group entries. But if there is an ACL_MASK entry, it applies
2738 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2739 * so that it doesn't deny (i.e., mask off) any permissions.
2740 */
2741
2742 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2743 needs_mask = True;
2744 mask_perms |= p_ace->perms;
2745 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2746 mask_perms |= p_ace->perms;
2747 }
2748
2749 /*
2750 * Get the entry for this ACE.
2751 */
2752
2753 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2754 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2755 i, strerror(errno) ));
2756 goto fail;
2757 }
2758
2759 if (p_ace->type == SMB_ACL_MASK) {
2760 mask_entry = the_entry;
2761 got_mask_entry = True;
2762 }
2763
2764 /*
2765 * Ok - we now know the ACL calls should be working, don't
2766 * allow fallback to chmod.
2767 */
2768
2769 *pacl_set_support = True;
2770
2771 /*
2772 * Initialise the entry from the canon_ace.
2773 */
2774
2775 /*
2776 * First tell the entry what type of ACE this is.
2777 */
2778
2779 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2780 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2781 i, strerror(errno) ));
2782 goto fail;
2783 }
2784
2785 /*
2786 * Only set the qualifier (user or group id) if the entry is a user
2787 * or group id ACE.
2788 */
2789
2790 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2791 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2792 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2793 i, strerror(errno) ));
2794 goto fail;
2795 }
2796 }
2797
2798 /*
2799 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2800 */
2801
2802 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2803 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2804 i, strerror(errno) ));
2805 goto fail;
2806 }
2807
2808 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2809 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2810 (unsigned int)p_ace->perms, i, strerror(errno) ));
2811 goto fail;
2812 }
2813
2814 /*
2815 * ..and apply them to the entry.
2816 */
2817
2818 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2819 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2820 i, strerror(errno) ));
2821 goto fail;
2822 }
2823
2824 if( DEBUGLVL( 10 ))
2825 print_canon_ace( p_ace, i);
2826
2827 }
2828
2829 if (needs_mask && !got_mask_entry) {
2830 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2831 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2832 goto fail;
2833 }
2834
2835 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2836 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2837 goto fail;
2838 }
2839
2840 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2841 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2842 goto fail;
2843 }
2844
2845 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2846 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2847 goto fail;
2848 }
2849
2850 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2851 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2852 goto fail;
2853 }
2854 }
2855
2856 /*
2857 * Finally apply it to the file or directory.
2858 */
2859
2860 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2861 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2862 the_acl_type, the_acl) == -1) {
2863 /*
2864 * Some systems allow all the above calls and only fail with no ACL support
2865 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2866 */
2867 if (no_acl_syscall_error(errno)) {
2868 *pacl_set_support = False;
2869 }
2870
2871 if (acl_group_override(conn, fsp->fsp_name)) {
2872 int sret;
2873
2874 DEBUG(5,("set_canon_ace_list: acl group "
2875 "control on and current user in file "
2876 "%s primary group.\n",
2877 fsp_str_dbg(fsp)));
2878
2879 become_root();
2880 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2881 fsp->fsp_name->base_name, the_acl_type,
2882 the_acl);
2883 unbecome_root();
2884 if (sret == 0) {
2885 ret = True;
2886 }
2887 }
2888
2889 if (ret == False) {
2890 DEBUG(2,("set_canon_ace_list: "
2891 "sys_acl_set_file type %s failed for "
2892 "file %s (%s).\n",
2893 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2894 "directory default" : "file",
2895 fsp_str_dbg(fsp), strerror(errno)));
2896 goto fail;
2897 }
2898 }
2899 } else {
2900 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2901 /*
2902 * Some systems allow all the above calls and only fail with no ACL support
2903 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2904 */
2905 if (no_acl_syscall_error(errno)) {
2906 *pacl_set_support = False;
2907 }
2908
2909 if (acl_group_override(conn, fsp->fsp_name)) {
2910 int sret;
2911
2912 DEBUG(5,("set_canon_ace_list: acl group "
2913 "control on and current user in file "
2914 "%s primary group.\n",
2915 fsp_str_dbg(fsp)));
2916
2917 become_root();
2918 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2919 unbecome_root();
2920 if (sret == 0) {
2921 ret = True;
2922 }
2923 }
2924
2925 if (ret == False) {
2926 DEBUG(2,("set_canon_ace_list: "
2927 "sys_acl_set_file failed for file %s "
2928 "(%s).\n",
2929 fsp_str_dbg(fsp), strerror(errno)));
2930 goto fail;
2931 }
2932 }
2933 }
2934
2935 ret = True;
2936
2937 fail:
2938
2939 if (the_acl != NULL) {
2940 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2941 }
2942
2943 return ret;
2944 }
2945
2946 /****************************************************************************
2947 Find a particular canon_ace entry.
2948 ****************************************************************************/
2949
2950 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2951 {
2952 while (list) {
2953 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2954 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2955 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2956 break;
2957 list = list->next;
2958 }
2959 return list;
2960 }
2961
2962 /****************************************************************************
2963
2964 ****************************************************************************/
2965
2966 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2967 {
2968 SMB_ACL_ENTRY_T entry;
2969
2970 if (!the_acl)
2971 return NULL;
2972 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2973 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2974 return NULL;
2975 }
2976 return the_acl;
2977 }
2978
2979 /****************************************************************************
2980 Convert a canon_ace to a generic 3 element permission - if possible.
2981 ****************************************************************************/
2982
2983 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2984
2985 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2986 {
2987 int snum = SNUM(fsp->conn);
2988 size_t ace_count = count_canon_ace_list(file_ace_list);
2989 canon_ace *ace_p;
2990 canon_ace *owner_ace = NULL;
2991 canon_ace *group_ace = NULL;
2992 canon_ace *other_ace = NULL;
2993 mode_t and_bits;
2994 mode_t or_bits;
2995
2996 if (ace_count != 3) {
2997 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2998 "entries for file %s to convert to posix perms.\n",
2999 fsp_str_dbg(fsp)));
3000 return False;
3001 }
3002
3003 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3004 if (ace_p->owner_type == UID_ACE)
3005 owner_ace = ace_p;
3006 else if (ace_p->owner_type == GID_ACE)
3007 group_ace = ace_p;
3008 else if (ace_p->owner_type == WORLD_ACE)
3009 other_ace = ace_p;
3010 }
3011
3012 if (!owner_ace || !group_ace || !other_ace) {
3013 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3014 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3015 return False;
3016 }
3017
3018 *posix_perms = (mode_t)0;
3019
3020 *posix_perms |= owner_ace->perms;
3021 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3022 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3023 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3024 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3025 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3026 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3027
3028 /* The owner must have at least read access. */
3029
3030 *posix_perms |= S_IRUSR;
3031 if (fsp->is_directory)
3032 *posix_perms |= (S_IWUSR|S_IXUSR);
3033
3034 /* If requested apply the masks. */
3035
3036 /* Get the initial bits to apply. */
3037
3038 if (fsp->is_directory) {
3039 and_bits = lp_dir_security_mask(snum);
3040 or_bits = lp_force_dir_security_mode(snum);
3041 } else {
3042 and_bits = lp_security_mask(snum);
3043 or_bits = lp_force_security_mode(snum);
3044 }
3045
3046 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3047
3048 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3049 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3050 (int)group_ace->perms, (int)other_ace->perms,
3051 (int)*posix_perms, fsp_str_dbg(fsp)));
3052
3053 return True;
3054 }
3055
3056 /****************************************************************************
3057 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3058 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3059 with CI|OI set so it is inherited and also applies to the directory.
3060 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3061 ****************************************************************************/
3062
3063 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3064 {
3065 size_t i, j;
3066
3067 for (i = 0; i < num_aces; i++) {
3068 for (j = i+1; j < num_aces; j++) {
3069 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3070 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3071 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3072 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3073
3074 /* We know the lower number ACE's are file entries. */
3075 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3076 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3077 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3078 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3079 (i_inh == j_inh) &&
3080 (i_flags_ni == 0) &&
3081 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3082 SEC_ACE_FLAG_CONTAINER_INHERIT|
3083 SEC_ACE_FLAG_INHERIT_ONLY))) {
3084 /*
3085 * W2K wants to have access allowed zero access ACE's
3086 * at the end of the list. If the mask is zero, merge
3087 * the non-inherited ACE onto the inherited ACE.
3088 */
3089
3090 if (nt_ace_list[i].access_mask == 0) {
3091 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3092 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3093 if (num_aces - i - 1 > 0)
3094 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3095 sizeof(SEC_ACE));
3096
3097 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3098 (unsigned int)i, (unsigned int)j ));
3099 } else {
3100 /*
3101 * These are identical except for the flags.
3102 * Merge the inherited ACE onto the non-inherited ACE.
3103 */
3104
3105 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3106 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3107 if (num_aces - j - 1 > 0)
3108 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3109 sizeof(SEC_ACE));
3110
3111 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3112 (unsigned int)j, (unsigned int)i ));
3113 }
3114 num_aces--;
3115 break;
3116 }
3117 }
3118 }
3119
3120 return num_aces;
3121 }
3122
3123 /*
3124 * Add or Replace ACE entry.
3125 * In some cases we need to add a specific ACE for compatibility reasons.
3126 * When doing that we must make sure we are not actually creating a duplicate
3127 * entry. So we need to search whether an ACE entry already exist and eventually
3128 * replacce the access mask, or add a completely new entry if none was found.
3129 *
3130 * This function assumes the array has enough space to add a new entry without
3131 * any reallocation of memory.
3132 */
3133
3134 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3135 const DOM_SID *sid, enum security_ace_type type,
3136 uint32_t mask, uint8_t flags)
3137 {
3138 int i;
3139
3140 /* first search for a duplicate */
3141 for (i = 0; i < *num_aces; i++) {
3142 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3143 (nt_ace_list[i].flags == flags)) break;
3144 }
3145
3146 if (i < *num_aces) { /* found */
3147 nt_ace_list[i].type = type;
3148 nt_ace_list[i].access_mask = mask;
3149 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3150 i, sid_string_dbg(sid), flags));
3151 return;
3152 }
3153
3154 /* not found, append it */
3155 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3156 }
3157
3158
3159 /****************************************************************************
3160 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3161 the space for the return elements and returns the size needed to return the
3162 security descriptor. This should be the only external function needed for
3163 the UNIX style get ACL.
3164 ****************************************************************************/
3165
3166 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3167 const char *name,
3168 const SMB_STRUCT_STAT *sbuf,
3169 struct pai_val *pal,
3170 SMB_ACL_T posix_acl,
3171 SMB_ACL_T def_acl,
3172 uint32_t security_info,
3173 SEC_DESC **ppdesc)
3174 {
3175 DOM_SID owner_sid;
3176 DOM_SID group_sid;
3177 size_t sd_size = 0;
3178 SEC_ACL *psa = NULL;
3179 size_t num_acls = 0;
3180 size_t num_def_acls = 0;
3181 size_t num_aces = 0;
3182 canon_ace *file_ace = NULL;
3183 canon_ace *dir_ace = NULL;
3184 SEC_ACE *nt_ace_list = NULL;
3185 size_t num_profile_acls = 0;
3186 DOM_SID orig_owner_sid;
3187 SEC_DESC *psd = NULL;
3188 int i;
3189
3190 /*
3191 * Get the owner, group and world SIDs.
3192 */
3193
3194 create_file_sids(sbuf, &owner_sid, &group_sid);
3195
3196 if (lp_profile_acls(SNUM(conn))) {
3197 /* For WXP SP1 the owner must be administrators. */
3198 sid_copy(&orig_owner_sid, &owner_sid);
3199 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3200 sid_copy(&group_sid, &global_sid_Builtin_Users);
3201 num_profile_acls = 3;
3202 }
3203
3204 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3205
3206 /*
3207 * In the optimum case Creator Owner and Creator Group would be used for
3208 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3209 * would lead to usability problems under Windows: The Creator entries
3210 * are only available in browse lists of directories and not for files;
3211 * additionally the identity of the owning group couldn't be determined.
3212 * We therefore use those identities only for Default ACLs.
3213 */
3214
3215 /* Create the canon_ace lists. */
3216 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3217 &owner_sid, &group_sid, pal,
3218 SMB_ACL_TYPE_ACCESS);
3219
3220 /* We must have *some* ACLS. */
3221
3222 if (count_canon_ace_list(file_ace) == 0) {
3223 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3224 goto done;
3225 }
3226
3227 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3228 dir_ace = canonicalise_acl(conn, name, def_acl,
3229 sbuf,
3230 &global_sid_Creator_Owner,
3231 &global_sid_Creator_Group,
3232 pal, SMB_ACL_TYPE_DEFAULT);
3233 }
3234
3235 /*
3236 * Create the NT ACE list from the canonical ace lists.
3237 */
3238
3239 {
3240 canon_ace *ace;
3241 enum security_ace_type nt_acl_type;
3242
3243 if (nt4_compatible_acls() && dir_ace) {
3244 /*
3245 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3246 * but no non-INHERIT_ONLY entry for one SID. So we only
3247 * remove entries from the Access ACL if the
3248 * corresponding Default ACL entries have also been
3249 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3250 * are exceptions. We can do nothing
3251 * intelligent if the Default ACL contains entries that
3252 * are not also contained in the Access ACL, so this
3253 * case will still fail under NT 4.
3254 */
3255
3256 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3257 if (ace && !ace->perms) {
3258 DLIST_REMOVE(dir_ace, ace);
3259 SAFE_FREE(ace);
3260
3261 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3262 if (ace && !ace->perms) {
3263 DLIST_REMOVE(file_ace, ace);
3264 SAFE_FREE(ace);
3265 }
3266 }
3267
3268 /*
3269 * WinNT doesn't usually have Creator Group
3270 * in browse lists, so we send this entry to
3271 * WinNT even if it contains no relevant
3272 * permissions. Once we can add
3273 * Creator Group to browse lists we can
3274 * re-enable this.
3275 */
3276
3277 #if 0
3278 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3279 if (ace && !ace->perms) {
3280 DLIST_REMOVE(dir_ace, ace);
3281 SAFE_FREE(ace);
3282 }
3283 #endif
3284
3285 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3286 if (ace && !ace->perms) {
3287 DLIST_REMOVE(file_ace, ace);
3288 SAFE_FREE(ace);
3289 }
3290 }
3291
3292 num_acls = count_canon_ace_list(file_ace);
3293 num_def_acls = count_canon_ace_list(dir_ace);
3294
3295 /* Allocate the ace list. */
3296 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3297 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3298 goto done;
3299 }
3300
3301 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3302
3303 /*
3304 * Create the NT ACE list from the canonical ace lists.
3305 */
3306
3307 for (ace = file_ace; ace != NULL; ace = ace->next) {
3308 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3309 &nt_acl_type,
3310 ace->perms,
3311 S_ISDIR(sbuf->st_ex_mode));
3312 init_sec_ace(&nt_ace_list[num_aces++],
3313 &ace->trustee,
3314 nt_acl_type,
3315 acc,
3316 ace->ace_flags);
3317 }
3318
3319 /* The User must have access to a profile share - even
3320 * if we can't map the SID. */
3321 if (lp_profile_acls(SNUM(conn))) {
3322 add_or_replace_ace(nt_ace_list, &num_aces,
3323 &global_sid_Builtin_Users,
3324 SEC_ACE_TYPE_ACCESS_ALLOWED,
3325 FILE_GENERIC_ALL, 0);
3326 }
3327
3328 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3329 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3330 &nt_acl_type,
3331 ace->perms,
3332 S_ISDIR(sbuf->st_ex_mode));
3333 init_sec_ace(&nt_ace_list[num_aces++],
3334 &ace->trustee,
3335 nt_acl_type,
3336 acc,
3337 ace->ace_flags |
3338 SEC_ACE_FLAG_OBJECT_INHERIT|
3339 SEC_ACE_FLAG_CONTAINER_INHERIT|
3340 SEC_ACE_FLAG_INHERIT_ONLY);
3341 }
3342
3343 /* The User must have access to a profile share - even
3344 * if we can't map the SID. */
3345 if (lp_profile_acls(SNUM(conn))) {
3346 add_or_replace_ace(nt_ace_list, &num_aces,
3347 &global_sid_Builtin_Users,
3348 SEC_ACE_TYPE_ACCESS_ALLOWED,
3349 FILE_GENERIC_ALL,
3350 SEC_ACE_FLAG_OBJECT_INHERIT |
3351 SEC_ACE_FLAG_CONTAINER_INHERIT |
3352 SEC_ACE_FLAG_INHERIT_ONLY);
3353 }
3354
3355 /*
3356 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3357 * Win2K needs this to get the inheritance correct when replacing ACLs
3358 * on a directory tree. Based on work by Jim @ IBM.
3359 */
3360
3361 num_aces = merge_default_aces(nt_ace_list, num_aces);
3362
3363 if (lp_profile_acls(SNUM(conn))) {
3364 for (i = 0; i < num_aces; i++) {
3365 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3366 add_or_replace_ace(nt_ace_list, &num_aces,
3367 &orig_owner_sid,
3368 nt_ace_list[i].type,
3369 nt_ace_list[i].access_mask,
3370 nt_ace_list[i].flags);
3371 break;
3372 }
3373 }
3374 }
3375 }
3376
3377 if (num_aces) {
3378 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3379 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3380 goto done;
3381 }
3382 }
3383 } /* security_info & DACL_SECURITY_INFORMATION */
3384
3385 psd = make_standard_sec_desc( talloc_tos(),
3386 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3387 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3388 psa,
3389 &sd_size);
3390
3391 if(!psd) {
3392 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3393 sd_size = 0;
3394 goto done;
3395 }
3396
3397 /*
3398 * Windows 2000: The DACL_PROTECTED flag in the security
3399 * descriptor marks the ACL as non-inheriting, i.e., no
3400 * ACEs from higher level directories propagate to this
3401 * ACL. In the POSIX ACL model permissions are only
3402 * inherited at file create time, so ACLs never contain
3403 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3404 * flag doesn't seem to bother Windows NT.
3405 * Always set this if map acl inherit is turned off.
3406 */
3407 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3408 psd->type |= SEC_DESC_DACL_PROTECTED;
3409 } else {
3410 psd->type |= pal->sd_type;
3411 }
3412
3413 if (psd->dacl) {
3414 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3415 }
3416
3417 *ppdesc = psd;
3418
3419 done:
3420
3421 if (posix_acl) {
3422 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3423 }
3424 if (def_acl) {
3425 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3426 }
3427 free_canon_ace_list(file_ace);
3428 free_canon_ace_list(dir_ace);
3429 free_inherited_info(pal);
3430 SAFE_FREE(nt_ace_list);
3431
3432 return NT_STATUS_OK;
3433 }
3434
3435 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3436 SEC_DESC **ppdesc)
3437 {
3438 SMB_STRUCT_STAT sbuf;
3439 SMB_ACL_T posix_acl = NULL;
3440 struct pai_val *pal;
3441
3442 *ppdesc = NULL;
3443
3444 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3445 fsp_str_dbg(fsp)));
3446
3447 /* can it happen that fsp_name == NULL ? */
3448 if (fsp->is_directory || fsp->fh->fd == -1) {
3449 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3450 security_info, ppdesc);
3451 }
3452
3453 /* Get the stat struct for the owner info. */
3454 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3455 return map_nt_error_from_unix(errno);
3456 }
3457
3458 /* Get the ACL from the fd. */
3459 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3460
3461 pal = fload_inherited_info(fsp);
3462
3463 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3464 &sbuf, pal, posix_acl, NULL,
3465 security_info, ppdesc);
3466 }
3467
3468 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3469 uint32_t security_info, SEC_DESC **ppdesc)
3470 {
3471 SMB_ACL_T posix_acl = NULL;
3472 SMB_ACL_T def_acl = NULL;
3473 struct pai_val *pal;
3474 struct smb_filename smb_fname;
3475 int ret;
3476
3477 *ppdesc = NULL;
3478
3479 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3480
3481 ZERO_STRUCT(smb_fname);
3482 smb_fname.base_name = discard_const_p(char, name);
3483
3484 /* Get the stat struct for the owner info. */
3485 if (lp_posix_pathnames()) {
3486 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3487 } else {
3488 ret = SMB_VFS_STAT(conn, &smb_fname);
3489 }
3490
3491 if (ret == -1) {
3492 return map_nt_error_from_unix(errno);
3493 }
3494
3495 /* Get the ACL from the path. */
3496 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3497
3498 /* If it's a directory get the default POSIX ACL. */
3499 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3500 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3501 def_acl = free_empty_sys_acl(conn, def_acl);
3502 }
3503
3504 pal = load_inherited_info(conn, name);
3505
3506 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3507 posix_acl, def_acl, security_info,
3508 ppdesc);
3509 }
3510
3511 /****************************************************************************
3512 Try to chown a file. We will be able to chown it under the following conditions.
3513
3514 1) If we have root privileges, then it will just work.
3515 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3516 3) If we have SeRestorePrivilege we can change the user to any other user.
3517 4) If we have write permission to the file and dos_filemodes is set
3518 then allow chown to the currently authenticated user.
3519 ****************************************************************************/
3520
3521 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3522 uid_t uid, gid_t gid)
3523 {
3524 int ret;
3525 files_struct *fsp;
3526
3527 if(!CAN_WRITE(conn)) {
3528 return -1;
3529 }
3530
3531 /* Case (1). */
3532 /* try the direct way first */
3533 if (lp_posix_pathnames()) {
3534 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3535 } else {
3536 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3537 }
3538
3539 if (ret == 0)
3540 return 0;
3541
3542 /* Case (2) / (3) */
3543 if (lp_enable_privileges()) {
3544
3545 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3546 &se_take_ownership);
3547 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3548 &se_restore);
3549
3550 /* Case (2) */
3551 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3552 /* Case (3) */
3553 ( has_restore_priv ) ) {
3554
3555 become_root();
3556 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3557 if (lp_posix_pathnames()) {
3558 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3559 (gid_t)-1);
3560 } else {
3561 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3562 (gid_t)-1);
3563 }
3564 unbecome_root();
3565 return ret;
3566 }
3567 }
3568
3569 /* Case (4). */
3570 if (!lp_dos_filemode(SNUM(conn))) {
3571 errno = EPERM;
3572 return -1;
3573 }
3574
3575 /* only allow chown to the current user. This is more secure,
3576 and also copes with the case where the SID in a take ownership ACL is
3577 a local SID on the users workstation
3578 */
3579 if (uid != current_user.ut.uid) {
3580 errno = EPERM;
3581 return -1;
3582 }
3583
3584 if (lp_posix_pathnames()) {
3585 ret = SMB_VFS_LSTAT(conn, smb_fname);
3586 } else {
3587 ret = SMB_VFS_STAT(conn, smb_fname);
3588 }
3589
3590 if (ret == -1) {
3591 return -1;
3592 }
3593
3594 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3595 return -1;
3596 }
3597
3598 become_root();
3599 /* Keep the current file gid the same. */
3600 if (fsp->fh->fd == -1) {
3601 if (lp_posix_pathnames()) {
3602 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3603 (gid_t)-1);
3604 } else {
3605 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3606 (gid_t)-1);
3607 }
3608 } else {
3609 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3610 }
3611 unbecome_root();
3612
3613 close_file_fchmod(NULL, fsp);
3614
3615 return ret;
3616 }
3617
3618 #if 0
3619 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3620
3621 /****************************************************************************
3622 Take care of parent ACL inheritance.
3623 ****************************************************************************/
3624
3625 NTSTATUS append_parent_acl(files_struct *fsp,
3626 const SEC_DESC *pcsd,
3627 SEC_DESC **pp_new_sd)
3628 {
3629 struct smb_filename *smb_dname = NULL;
3630 SEC_DESC *parent_sd = NULL;
3631 files_struct *parent_fsp = NULL;
3632 TALLOC_CTX *mem_ctx = talloc_tos();
3633 char *parent_name = NULL;
3634 SEC_ACE *new_ace = NULL;
3635 unsigned int num_aces = pcsd->dacl->num_aces;
3636 NTSTATUS status;
3637 int info;
3638 unsigned int i, j;
3639 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3640 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3641
3642 if (psd == NULL) {
3643 return NT_STATUS_NO_MEMORY;
3644 }
3645
3646 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3647 NULL)) {
3648 return NT_STATUS_NO_MEMORY;
3649 }
3650
3651 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3652 &smb_dname);
3653 if (!NT_STATUS_IS_OK(status)) {
3654 goto fail;
3655 }
3656
3657 status = SMB_VFS_CREATE_FILE(
3658 fsp->conn, /* conn */
3659 NULL, /* req */
3660 0, /* root_dir_fid */
3661 smb_dname, /* fname */
3662 FILE_READ_ATTRIBUTES, /* access_mask */
3663 FILE_SHARE_NONE, /* share_access */
3664 FILE_OPEN, /* create_disposition*/
3665 FILE_DIRECTORY_FILE, /* create_options */
3666 0, /* file_attributes */
3667 INTERNAL_OPEN_ONLY, /* oplock_request */
3668 0, /* allocation_size */
3669 NULL, /* sd */
3670 NULL, /* ea_list */
3671 &parent_fsp, /* result */
3672 &info); /* pinfo */
3673
3674 if (!NT_STATUS_IS_OK(status)) {
3675 TALLOC_FREE(smb_dname);
3676 return status;
3677 }
3678
3679 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3680 DACL_SECURITY_INFORMATION, &parent_sd );
3681
3682 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3683 TALLOC_FREE(smb_dname);
3684
3685 if (!NT_STATUS_IS_OK(status)) {
3686 return status;
3687 }
3688
3689 /*
3690 * Make room for potentially all the ACLs from
3691 * the parent. We used to add the ugw triple here,
3692 * as we knew we were dealing with POSIX ACLs.
3693 * We no longer need to do so as we can guarentee
3694 * that a default ACL from the parent directory will
3695 * be well formed for POSIX ACLs if it came from a
3696 * POSIX ACL source, and if we're not writing to a
3697 * POSIX ACL sink then we don't care if it's not well
3698 * formed. JRA.
3699 */
3700
3701 num_aces += parent_sd->dacl->num_aces;
3702
3703 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3704 num_aces)) == NULL) {
3705 return NT_STATUS_NO_MEMORY;
3706 }
3707
3708 /* Start by copying in all the given ACE entries. */
3709 for (i = 0; i < psd->dacl->num_aces; i++) {
3710 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3711 }
3712
3713 /*
3714 * Note that we're ignoring "inherit permissions" here
3715 * as that really only applies to newly created files. JRA.
3716 */
3717
3718 /* Finally append any inherited ACEs. */
3719 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3720 SEC_ACE *se = &parent_sd->dacl->aces[j];
3721
3722 if (fsp->is_directory) {
3723 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3724 /* Doesn't apply to a directory - ignore. */
3725 DEBUG(10,("append_parent_acl: directory %s "
3726 "ignoring non container "
3727 "inherit flags %u on ACE with sid %s "
3728 "from parent %s\n",
3729 fsp_str_dbg(fsp),
3730 (unsigned int)se->flags,
3731 sid_string_dbg(&se->trustee),
3732 parent_name));
3733 continue;
3734 }
3735 } else {
3736 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3737 /* Doesn't apply to a file - ignore. */
3738 DEBUG(10,("append_parent_acl: file %s "
3739 "ignoring non object "
3740 "inherit flags %u on ACE with sid %s "
3741 "from parent %s\n",
3742 fsp_str_dbg(fsp),
3743 (unsigned int)se->flags,
3744 sid_string_dbg(&se->trustee),
3745 parent_name));
3746 continue;
3747 }
3748 }
3749
3750 if (is_dacl_protected) {
3751 /* If the DACL is protected it means we must
3752 * not overwrite an existing ACE entry with the
3753 * same SID. This is order N^2. Ouch :-(. JRA. */
3754 unsigned int k;
3755 for (k = 0; k < psd->dacl->num_aces; k++) {
3756 if (sid_equal(&psd->dacl->aces[k].trustee,
3757 &se->trustee)) {
3758 break;
3759 }
3760 }
3761 if (k < psd->dacl->num_aces) {
3762 /* SID matched. Ignore. */
3763 DEBUG(10,("append_parent_acl: path %s "
3764 "ignoring ACE with protected sid %s "
3765 "from parent %s\n",
3766 fsp_str_dbg(fsp),
3767 sid_string_dbg(&se->trustee),
3768 parent_name));
3769 continue;
3770 }
3771 }
3772
3773 sec_ace_copy(&new_ace[i], se);
3774 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3775 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3776 }
3777 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3778
3779 if (fsp->is_directory) {
3780 /*
3781 * Strip off any inherit only. It's applied.
3782 */
3783 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3784 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3785 /* No further inheritance. */
3786 new_ace[i].flags &=
3787 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3788 SEC_ACE_FLAG_OBJECT_INHERIT);
3789 }
3790 } else {
3791 /*
3792 * Strip off any container or inherit
3793 * flags, they can't apply to objects.
3794 */
3795 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3796 SEC_ACE_FLAG_INHERIT_ONLY|
3797 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3798 }
3799 i++;
3800
3801 DEBUG(10,("append_parent_acl: path %s "
3802 "inheriting ACE with sid %s "
3803 "from parent %s\n",
3804 fsp_str_dbg(fsp),
3805 sid_string_dbg(&se->trustee),
3806 parent_name));
3807 }
3808
3809 psd->dacl->aces = new_ace;
3810 psd->dacl->num_aces = i;
3811 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3812 SE_DESC_DACL_AUTO_INHERIT_REQ);
3813
3814 *pp_new_sd = psd;
3815 return status;
3816 }
3817 #endif
3818
3819 /****************************************************************************
3820 Reply to set a security descriptor on an fsp. security_info_sent is the
3821 description of the following NT ACL.
3822 This should be the only external function needed for the UNIX style set ACL.
3823 ****************************************************************************/
3824
3825 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig)
3826 {
3827 connection_struct *conn = fsp->conn;
3828 uid_t user = (uid_t)-1;
3829 gid_t grp = (gid_t)-1;
3830 DOM_SID file_owner_sid;
3831 DOM_SID file_grp_sid;
3832 canon_ace *file_ace_list = NULL;
3833 canon_ace *dir_ace_list = NULL;
3834 bool acl_perms = False;
3835 mode_t orig_mode = (mode_t)0;
3836 NTSTATUS status;
3837 bool set_acl_as_root = false;
3838 bool acl_set_support = false;
3839 bool ret = false;
3840 SEC_DESC *psd = NULL;
3841
3842 DEBUG(10,("set_nt_acl: called for file %s\n",
3843 fsp_str_dbg(fsp)));
3844
3845 if (!CAN_WRITE(conn)) {
3846 DEBUG(10,("set acl rejected on read-only share\n"));
3847 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3848 }
3849
3850 if (!psd_orig) {
3851 return NT_STATUS_INVALID_PARAMETER;
3852 }
3853
3854 psd = dup_sec_desc(talloc_tos(), psd_orig);
3855 if (!psd) {
3856 return NT_STATUS_NO_MEMORY;
3857 }
3858
3859 if((security_info_sent & SECINFO_DACL) &&
3860 (psd->type & SEC_DESC_DACL_PRESENT) &&
3861 (psd->dacl == NULL)) {
3862 SEC_ACE ace;
3863
3864 /* We can't have NULL DACL in POSIX.
3865 Use Everyone -> full access. */
3866
3867 init_sec_ace(&ace,
3868 &global_sid_World,
3869 SEC_ACE_TYPE_ACCESS_ALLOWED,
3870 GENERIC_ALL_ACCESS,
3871 0);
3872 psd->dacl = make_sec_acl(talloc_tos(),
3873 NT4_ACL_REVISION,
3874 1,
3875 &ace);
3876 if (psd->dacl == NULL) {
3877 return NT_STATUS_NO_MEMORY;
3878 }
3879 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3880 }
3881
3882 /*
3883 * Get the current state of the file.
3884 */
3885
3886 status = vfs_stat_fsp(fsp);
3887 if (!NT_STATUS_IS_OK(status)) {
3888 return status;
3889 }
3890
3891 /* Save the original element we check against. */
3892 orig_mode = fsp->fsp_name->st.st_ex_mode;
3893
3894 /*
3895 * Unpack the user/group/world id's.
3896 */
3897
3898 /* POSIX can't cope with missing owner/group. */
3899 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3900 security_info_sent &= ~SECINFO_OWNER;
3901 }
3902 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3903 security_info_sent &= ~SECINFO_GROUP;
3904 }
3905
3906 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3907 if (!NT_STATUS_IS_OK(status)) {
3908 return status;
3909 }
3910
3911 /*
3912 * Do we need to chown ? If so this must be done first as the incoming
3913 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3914 * Noticed by Simo.
3915 */
3916
3917 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3918 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3919
3920 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3921 fsp_str_dbg(fsp), (unsigned int)user,
3922 (unsigned int)grp));
3923
3924 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3925 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3926 "= %s.\n", fsp_str_dbg(fsp),
3927 (unsigned int)user, (unsigned int)grp,
3928 strerror(errno)));
3929 if (errno == EPERM) {
3930 return NT_STATUS_INVALID_OWNER;
3931 }
3932 return map_nt_error_from_unix(errno);
3933 }
3934
3935 /*
3936 * Recheck the current state of the file, which may have changed.
3937 * (suid/sgid bits, for instance)
3938 */
3939
3940 status = vfs_stat_fsp(fsp);
3941 if (!NT_STATUS_IS_OK(status)) {
3942 return status;
3943 }
3944
3945 /* Save the original element we check against. */
3946 orig_mode = fsp->fsp_name->st.st_ex_mode;
3947
3948 /* If we successfully chowned, we know we must
3949 * be able to set the acl, so do it as root.
3950 */
3951 set_acl_as_root = true;
3952 }
3953
3954 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3955
3956 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3957 &file_grp_sid, &file_ace_list,
3958 &dir_ace_list, security_info_sent, psd);
3959
3960 /* Ignore W2K traverse DACL set. */
3961 if (!file_ace_list && !dir_ace_list) {
3962 return NT_STATUS_OK;
3963 }
3964
3965 if (!acl_perms) {
3966 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3967 free_canon_ace_list(file_ace_list);
3968 free_canon_ace_list(dir_ace_list);
3969 return NT_STATUS_ACCESS_DENIED;
3970 }
3971
3972 /*
3973 * Only change security if we got a DACL.
3974 */
3975
3976 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3977 free_canon_ace_list(file_ace_list);
3978 free_canon_ace_list(dir_ace_list);
3979 return NT_STATUS_OK;
3980 }
3981
3982 /*
3983 * Try using the POSIX ACL set first. Fall back to chmod if
3984 * we have no ACL support on this filesystem.
3985 */
3986
3987 if (acl_perms && file_ace_list) {
3988 if (set_acl_as_root) {
3989 become_root();
3990 }
3991 ret = set_canon_ace_list(fsp, file_ace_list, false,
3992 &fsp->fsp_name->st, &acl_set_support);
3993 if (set_acl_as_root) {
3994 unbecome_root();
3995 }
3996 if (acl_set_support && ret == false) {
3997 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3998 "%s (%s).\n", fsp_str_dbg(fsp),
3999 strerror(errno)));
4000 free_canon_ace_list(file_ace_list);
4001 free_canon_ace_list(dir_ace_list);
4002 return map_nt_error_from_unix(errno);
4003 }
4004 }
4005
4006 if (acl_perms && acl_set_support && fsp->is_directory) {
4007 if (dir_ace_list) {
4008 if (set_acl_as_root) {
4009 become_root();
4010 }
4011 ret = set_canon_ace_list(fsp, dir_ace_list, true,
4012 &fsp->fsp_name->st,
4013 &acl_set_support);
4014 if (set_acl_as_root) {
4015 unbecome_root();
4016 }
4017 if (ret == false) {
4018 DEBUG(3,("set_nt_acl: failed to set default "
4019 "acl on directory %s (%s).\n",
4020 fsp_str_dbg(fsp), strerror(errno)));
4021 free_canon_ace_list(file_ace_list);
4022 free_canon_ace_list(dir_ace_list);
4023 return map_nt_error_from_unix(errno);
4024 }
4025 } else {
4026 int sret = -1;
4027
4028 /*
4029 * No default ACL - delete one if it exists.
4030 */
4031
4032 if (set_acl_as_root) {
4033 become_root();
4034 }
4035 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4036 fsp->fsp_name->base_name);
4037 if (set_acl_as_root) {
4038 unbecome_root();
4039 }
4040 if (sret == -1) {
4041 if (acl_group_override(conn, fsp->fsp_name)) {
4042 DEBUG(5,("set_nt_acl: acl group "
4043 "control on and current user "
4044 "in file %s primary group. "
4045 "Override delete_def_acl\n",
4046 fsp_str_dbg(fsp)));
4047
4048 become_root();
4049 sret =
4050 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4051 conn,
4052 fsp->fsp_name->base_name);
4053 unbecome_root();
4054 }
4055
4056 if (sret == -1) {
4057 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4058 free_canon_ace_list(file_ace_list);
4059 free_canon_ace_list(dir_ace_list);
4060 return map_nt_error_from_unix(errno);
4061 }
4062 }
4063 }
4064 }
4065
4066 if (acl_set_support) {
4067 if (set_acl_as_root) {
4068 become_root();
4069 }
4070 store_inheritance_attributes(fsp,
4071 file_ace_list,
4072 dir_ace_list,
4073 psd->type);
4074 if (set_acl_as_root) {
4075 unbecome_root();
4076 }
4077 }
4078
4079 /*
4080 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4081 */
4082
4083 if(!acl_set_support && acl_perms) {
4084 mode_t posix_perms;
4085
4086 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4087 free_canon_ace_list(file_ace_list);
4088 free_canon_ace_list(dir_ace_list);
4089 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4090 "posix permissions for file %s.\n",
4091 fsp_str_dbg(fsp)));
4092 return NT_STATUS_ACCESS_DENIED;
4093 }
4094
4095 if (orig_mode != posix_perms) {
4096 int sret = -1;
4097
4098 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4099 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4100
4101 if (set_acl_as_root) {
4102 become_root();
4103 }
4104 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4105 posix_perms);
4106 if (set_acl_as_root) {
4107 unbecome_root();
4108 }
4109 if(sret == -1) {
4110 if (acl_group_override(conn, fsp->fsp_name)) {
4111 DEBUG(5,("set_nt_acl: acl group "
4112 "control on and current user "
4113 "in file %s primary group. "
4114 "Override chmod\n",
4115 fsp_str_dbg(fsp)));
4116
4117 become_root();
4118 sret = SMB_VFS_CHMOD(conn,
4119 fsp->fsp_name->base_name,
4120 posix_perms);
4121 unbecome_root();
4122 }
4123
4124 if (sret == -1) {
4125 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4126 "failed. Error = %s.\n",
4127 fsp_str_dbg(fsp),
4128 (unsigned int)posix_perms,
4129 strerror(errno)));
4130 free_canon_ace_list(file_ace_list);
4131 free_canon_ace_list(dir_ace_list);
4132 return map_nt_error_from_unix(errno);
4133 }
4134 }
4135 }
4136 }
4137
4138 free_canon_ace_list(file_ace_list);
4139 free_canon_ace_list(dir_ace_list);
4140
4141 /* Ensure the stat struct in the fsp is correct. */
4142 status = vfs_stat_fsp(fsp);
4143
4144 return NT_STATUS_OK;
4145 }
4146
4147 /****************************************************************************
4148 Get the actual group bits stored on a file with an ACL. Has no effect if
4149 the file has no ACL. Needed in dosmode code where the stat() will return
4150 the mask bits, not the real group bits, for a file with an ACL.
4151 ****************************************************************************/
4152
4153 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4154 {
4155 int entry_id = SMB_ACL_FIRST_ENTRY;
4156 SMB_ACL_ENTRY_T entry;
4157 SMB_ACL_T posix_acl;
4158 int result = -1;
4159
4160 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4161 if (posix_acl == (SMB_ACL_T)NULL)
4162 return -1;
4163
4164 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4165 SMB_ACL_TAG_T tagtype;
4166 SMB_ACL_PERMSET_T permset;
4167
4168 entry_id = SMB_ACL_NEXT_ENTRY;
4169
4170 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4171 break;
4172
4173 if (tagtype == SMB_ACL_GROUP_OBJ) {
4174 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4175 break;
4176 } else {
4177 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4178 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4179 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4180 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4181 result = 0;
4182 break;
4183 }
4184 }
4185 }
4186 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4187 return result;
4188 }
4189
4190 /****************************************************************************
4191 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4192 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4193 ****************************************************************************/
4194
4195 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4196 {
4197 int entry_id = SMB_ACL_FIRST_ENTRY;
4198 SMB_ACL_ENTRY_T entry;
4199 int num_entries = 0;
4200
4201 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4202 SMB_ACL_TAG_T tagtype;
4203 SMB_ACL_PERMSET_T permset;
4204 mode_t perms;
4205
4206 entry_id = SMB_ACL_NEXT_ENTRY;
4207
4208 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4209 return -1;
4210
4211 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4212 return -1;
4213
4214 num_entries++;
4215
4216 switch(tagtype) {
4217 case SMB_ACL_USER_OBJ:
4218 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4219 break;
4220 case SMB_ACL_GROUP_OBJ:
4221 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4222 break;
4223 case SMB_ACL_MASK:
4224 /*
4225 * FIXME: The ACL_MASK entry permissions should really be set to
4226 * the union of the permissions of all ACL_USER,
4227 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4228 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4229 */
4230 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4231 break;
4232 case SMB_ACL_OTHER:
4233 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4234 break;
4235 default:
4236 continue;
4237 }
4238
4239 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4240 return -1;
4241
4242 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4243 return -1;
4244 }
4245
4246 /*
4247 * If this is a simple 3 element ACL or no elements then it's a standard
4248 * UNIX permission set. Just use chmod...
4249 */
4250
4251 if ((num_entries == 3) || (num_entries == 0))
4252 return -1;
4253
4254 return 0;
4255 }
4256
4257 /****************************************************************************
4258 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4259 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4260 resulting ACL on TO. Note that name is in UNIX character set.
4261 ****************************************************************************/
4262
4263 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4264 {
4265 SMB_ACL_T posix_acl = NULL;
4266 int ret = -1;
4267
4268 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4269 return -1;
4270
4271 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4272 goto done;
4273
4274 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4275
4276 done:
4277
4278 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4279 return ret;
4280 }
4281
4282 /****************************************************************************
4283 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4284 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4285 Note that name is in UNIX character set.
4286 ****************************************************************************/
4287
4288 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4289 {
4290 return copy_access_posix_acl(conn, name, name, mode);
4291 }
4292
4293 /****************************************************************************
4294 Check for an existing default POSIX ACL on a directory.
4295 ****************************************************************************/
4296
4297 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4298 {
4299 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4300 bool has_acl = False;
4301 SMB_ACL_ENTRY_T entry;
4302
4303 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4304 has_acl = True;
4305 }
4306
4307 if (def_acl) {
4308 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4309 }
4310 return has_acl;
4311 }
4312
4313 /****************************************************************************
4314 If the parent directory has no default ACL but it does have an Access ACL,
4315 inherit this Access ACL to file name.
4316 ****************************************************************************/
4317
4318 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4319 const char *name, mode_t mode)
4320 {
4321 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4322 return 0;
4323
4324 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4325 }
4326
4327 /****************************************************************************
4328 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4329 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4330 ****************************************************************************/
4331
4332 int fchmod_acl(files_struct *fsp, mode_t mode)
4333 {
4334 connection_struct *conn = fsp->conn;
4335 SMB_ACL_T posix_acl = NULL;
4336 int ret = -1;
4337
4338 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4339 return -1;
4340
4341 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4342 goto done;
4343
4344 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4345
4346 done:
4347
4348 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4349 return ret;
4350 }
4351
4352 /****************************************************************************
4353 Map from wire type to permset.
4354 ****************************************************************************/
4355
4356 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4357 {
4358 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4359 return False;
4360 }
4361
4362 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4363 return False;
4364 }
4365
4366 if (wire_perm & SMB_POSIX_ACL_READ) {
4367 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4368 return False;
4369 }
4370 }
4371 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4372 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4373 return False;
4374 }
4375 }
4376 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4377 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4378 return False;
4379 }
4380 }
4381 return True;
4382 }
4383
4384 /****************************************************************************
4385 Map from wire type to tagtype.
4386 ****************************************************************************/
4387
4388 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4389 {
4390 switch (wire_tt) {
4391 case SMB_POSIX_ACL_USER_OBJ:
4392 *p_tt = SMB_ACL_USER_OBJ;
4393 break;
4394 case SMB_POSIX_ACL_USER:
4395 *p_tt = SMB_ACL_USER;
4396 break;
4397 case SMB_POSIX_ACL_GROUP_OBJ:
4398 *p_tt = SMB_ACL_GROUP_OBJ;
4399 break;
4400 case SMB_POSIX_ACL_GROUP:
4401 *p_tt = SMB_ACL_GROUP;
4402 break;
4403 case SMB_POSIX_ACL_MASK:
4404 *p_tt = SMB_ACL_MASK;
4405 break;
4406 case SMB_POSIX_ACL_OTHER:
4407 *p_tt = SMB_ACL_OTHER;
4408 break;
4409 default:
4410 return False;
4411 }
4412 return True;
4413 }
4414
4415 /****************************************************************************
4416 Create a new POSIX acl from wire permissions.
4417 FIXME ! How does the share mask/mode fit into this.... ?
4418 ****************************************************************************/
4419
4420 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4421 {
4422 unsigned int i;
4423 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4424
4425 if (the_acl == NULL) {
4426 return NULL;
4427 }
4428
4429 for (i = 0; i < num_acls; i++) {
4430 SMB_ACL_ENTRY_T the_entry;
4431 SMB_ACL_PERMSET_T the_permset;
4432 SMB_ACL_TAG_T tag_type;
4433
4434 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4435 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4436 i, strerror(errno) ));
4437 goto fail;
4438 }
4439
4440 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4441 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4442 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4443 goto fail;
4444 }
4445
4446 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4447 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4448 i, strerror(errno) ));
4449 goto fail;
4450 }
4451
4452 /* Get the permset pointer from the new ACL entry. */
4453 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4454 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4455 i, strerror(errno) ));
4456 goto fail;
4457 }
4458
4459 /* Map from wire to permissions. */
4460 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4461 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4462 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4463 goto fail;
4464 }
4465
4466 /* Now apply to the new ACL entry. */
4467 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4468 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4469 i, strerror(errno) ));
4470 goto fail;
4471 }
4472
4473 if (tag_type == SMB_ACL_USER) {
4474 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4475 uid_t uid = (uid_t)uidval;
4476 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4477 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4478 (unsigned int)uid, i, strerror(errno) ));
4479 goto fail;
4480 }
4481 }
4482
4483 if (tag_type == SMB_ACL_GROUP) {
4484 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4485 gid_t gid = (uid_t)gidval;
4486 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4487 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4488 (unsigned int)gid, i, strerror(errno) ));
4489 goto fail;
4490 }
4491 }
4492 }
4493
4494 return the_acl;
4495
4496 fail:
4497
4498 if (the_acl != NULL) {
4499 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4500 }
4501 return NULL;
4502 }
4503
4504 /****************************************************************************
4505 Calls from UNIX extensions - Default POSIX ACL set.
4506 If num_def_acls == 0 and not a directory just return. If it is a directory
4507 and num_def_acls == 0 then remove the default acl. Else set the default acl
4508 on the directory.
4509 ****************************************************************************/
4510
4511 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4512 uint16 num_def_acls, const char *pdata)
4513 {
4514 SMB_ACL_T def_acl = NULL;
4515
4516 if (!S_ISDIR(psbuf->st_ex_mode)) {
4517 if (num_def_acls) {
4518 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4519 errno = EISDIR;
4520 return False;
4521 } else {
4522 return True;
4523 }
4524 }
4525
4526 if (!num_def_acls) {
4527 /* Remove the default ACL. */
4528 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4529 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4530 fname, strerror(errno) ));
4531 return False;
4532 }
4533 return True;
4534 }
4535
4536 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4537 return False;
4538 }
4539
4540 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4541 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4542 fname, strerror(errno) ));
4543 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4544 return False;
4545 }
4546
4547 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4548 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4549 return True;
4550 }
4551
4552 /****************************************************************************
4553 Remove an ACL from a file. As we don't have acl_delete_entry() available
4554 we must read the current acl and copy all entries except MASK, USER and GROUP
4555 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4556 removed.
4557 FIXME ! How does the share mask/mode fit into this.... ?
4558 ****************************************************************************/
4559
4560 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4561 {
4562 SMB_ACL_T file_acl = NULL;
4563 int entry_id = SMB_ACL_FIRST_ENTRY;
4564 SMB_ACL_ENTRY_T entry;
4565 bool ret = False;
4566 /* Create a new ACL with only 3 entries, u/g/w. */
4567 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4568 SMB_ACL_ENTRY_T user_ent = NULL;
4569 SMB_ACL_ENTRY_T group_ent = NULL;
4570 SMB_ACL_ENTRY_T other_ent = NULL;
4571
4572 if (new_file_acl == NULL) {
4573 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4574 return False;
4575 }
4576
4577 /* Now create the u/g/w entries. */
4578 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4579 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4580 fname, strerror(errno) ));
4581 goto done;
4582 }
4583 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4584 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4585 fname, strerror(errno) ));
4586 goto done;
4587 }
4588
4589 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4590 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4591 fname, strerror(errno) ));
4592 goto done;
4593 }
4594 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4595 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4596 fname, strerror(errno) ));
4597 goto done;
4598 }
4599
4600 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4601 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4602 fname, strerror(errno) ));
4603 goto done;
4604 }
4605 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4606 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4607 fname, strerror(errno) ));
4608 goto done;
4609 }
4610
4611 /* Get the current file ACL. */
4612 if (fsp && fsp->fh->fd != -1) {
4613 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4614 } else {
4615 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4616 }
4617
4618 if (file_acl == NULL) {
4619 /* This is only returned if an error occurred. Even for a file with
4620 no acl a u/g/w acl should be returned. */
4621 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4622 fname, strerror(errno) ));
4623 goto done;
4624 }
4625
4626 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4627 SMB_ACL_TAG_T tagtype;
4628 SMB_ACL_PERMSET_T permset;
4629
4630 entry_id = SMB_ACL_NEXT_ENTRY;
4631
4632 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4633 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4634 fname, strerror(errno) ));
4635 goto done;
4636 }
4637
4638 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4639 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4640 fname, strerror(errno) ));
4641 goto done;
4642 }
4643
4644 if (tagtype == SMB_ACL_USER_OBJ) {
4645 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4646 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4647 fname, strerror(errno) ));
4648 }
4649 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4650 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4651 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4652 fname, strerror(errno) ));
4653 }
4654 } else if (tagtype == SMB_ACL_OTHER) {
4655 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4656 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4657 fname, strerror(errno) ));
4658 }
4659 }
4660 }
4661
4662 /* Set the new empty file ACL. */
4663 if (fsp && fsp->fh->fd != -1) {
4664 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4665 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4666 fname, strerror(errno) ));
4667 goto done;
4668 }
4669 } else {
4670 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4671 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4672 fname, strerror(errno) ));
4673 goto done;
4674 }
4675 }
4676
4677 ret = True;
4678
4679 done:
4680
4681 if (file_acl) {
4682 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4683 }
4684 if (new_file_acl) {
4685 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4686 }
4687 return ret;
4688 }
4689
4690 /****************************************************************************
4691 Calls from UNIX extensions - POSIX ACL set.
4692 If num_def_acls == 0 then read/modify/write acl after removing all entries
4693 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4694 ****************************************************************************/
4695
4696 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4697 {
4698 SMB_ACL_T file_acl = NULL;
4699
4700 if (!num_acls) {
4701 /* Remove the ACL from the file. */
4702 return remove_posix_acl(conn, fsp, fname);
4703 }
4704
4705 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4706 return False;
4707 }
4708
4709 if (fsp && fsp->fh->fd != -1) {
4710 /* The preferred way - use an open fd. */
4711 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4712 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4713 fname, strerror(errno) ));
4714 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4715 return False;
4716 }
4717 } else {
4718 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4719 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4720 fname, strerror(errno) ));
4721 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4722 return False;
4723 }
4724 }
4725
4726 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4727 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4728 return True;
4729 }
4730
4731 /********************************************************************
4732 Pull the NT ACL from a file on disk or the OpenEventlog() access
4733 check. Caller is responsible for freeing the returned security
4734 descriptor via TALLOC_FREE(). This is designed for dealing with
4735 user space access checks in smbd outside of the VFS. For example,
4736 checking access rights in OpenEventlog().
4737
4738 Assume we are dealing with files (for now)
4739 ********************************************************************/
4740
4741 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4742 {
4743 SEC_DESC *psd, *ret_sd;
4744 connection_struct *conn;
4745 files_struct finfo;
4746 struct fd_handle fh;
4747 NTSTATUS status;
4748
4749 conn = TALLOC_ZERO_P(ctx, connection_struct);
4750 if (conn == NULL) {
4751 DEBUG(0, ("talloc failed\n"));
4752 return NULL;
4753 }
4754
4755 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4756 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4757 TALLOC_FREE(conn);
4758 return NULL;
4759 }
4760
4761 conn->params->service = -1;
4762
4763 set_conn_connectpath(conn, "/");
4764
4765 if (!smbd_vfs_init(conn)) {
4766 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4767 conn_free(conn);
4768 return NULL;
4769 }
4770
4771 ZERO_STRUCT( finfo );
4772 ZERO_STRUCT( fh );
4773
4774 finfo.fnum = -1;
4775 finfo.conn = conn;
4776 finfo.fh = &fh;
4777 finfo.fh->fd = -1;
4778
4779 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4780 &finfo.fsp_name);
4781 if (!NT_STATUS_IS_OK(status)) {
4782 conn_free(conn);
4783 return NULL;
4784 }
4785
4786 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4787 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4788 TALLOC_FREE(finfo.fsp_name);
4789 conn_free(conn);
4790 return NULL;
4791 }
4792
4793 ret_sd = dup_sec_desc( ctx, psd );
4794
4795 TALLOC_FREE(finfo.fsp_name);
4796 conn_free(conn);
4797
4798 return ret_sd;
4799 }
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