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release-scripts: add build-htmlman-nogit
[Samba.git] / source3 / smbd / posix_acls.c
blob880d5b945258d4a30ebcad25d8f131e542ccf349
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 #include "../libcli/security/security.h"
24
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 struct 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 SEC_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, struct dom_sid *powner_sid, struct 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 = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949 (curr_ace->attr == curr_ace_outer->attr));
950 } else {
951 can_merge = (dom_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 (dom_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 struct security_descriptor into a UNIX owner and group.
1169 ****************************************************************************/
1170
1171 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1172 uid_t *puser, gid_t *pgrp,
1173 uint32 security_info_sent, const struct
1174 security_descriptor *psd)
1175 {
1176 struct dom_sid owner_sid;
1177 struct dom_sid grp_sid;
1178
1179 *puser = (uid_t)-1;
1180 *pgrp = (gid_t)-1;
1181
1182 if(security_info_sent == 0) {
1183 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1184 return NT_STATUS_OK;
1185 }
1186
1187 /*
1188 * Validate the owner and group SID's.
1189 */
1190
1191 memset(&owner_sid, '\0', sizeof(owner_sid));
1192 memset(&grp_sid, '\0', sizeof(grp_sid));
1193
1194 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1195
1196 /*
1197 * Don't immediately fail if the owner sid cannot be validated.
1198 * This may be a group chown only set.
1199 */
1200
1201 if (security_info_sent & SECINFO_OWNER) {
1202 sid_copy(&owner_sid, psd->owner_sid);
1203 if (!sid_to_uid(&owner_sid, puser)) {
1204 if (lp_force_unknown_acl_user(SNUM(conn))) {
1205 /* this allows take ownership to work
1206 * reasonably */
1207 *puser = get_current_uid(conn);
1208 } else {
1209 DEBUG(3,("unpack_nt_owners: unable to validate"
1210 " owner sid for %s\n",
1211 sid_string_dbg(&owner_sid)));
1212 return NT_STATUS_INVALID_OWNER;
1213 }
1214 }
1215 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1216 (unsigned int)*puser ));
1217 }
1218
1219 /*
1220 * Don't immediately fail if the group sid cannot be validated.
1221 * This may be an owner chown only set.
1222 */
1223
1224 if (security_info_sent & SECINFO_GROUP) {
1225 sid_copy(&grp_sid, psd->group_sid);
1226 if (!sid_to_gid( &grp_sid, pgrp)) {
1227 if (lp_force_unknown_acl_user(SNUM(conn))) {
1228 /* this allows take group ownership to work
1229 * reasonably */
1230 *pgrp = get_current_gid(conn);
1231 } else {
1232 DEBUG(3,("unpack_nt_owners: unable to validate"
1233 " group sid.\n"));
1234 return NT_STATUS_INVALID_OWNER;
1235 }
1236 }
1237 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1238 (unsigned int)*pgrp));
1239 }
1240
1241 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1242
1243 return NT_STATUS_OK;
1244 }
1245
1246 /****************************************************************************
1247 Ensure the enforced permissions for this share apply.
1248 ****************************************************************************/
1249
1250 static void apply_default_perms(const struct share_params *params,
1251 const bool is_directory, canon_ace *pace,
1252 mode_t type)
1253 {
1254 mode_t and_bits = (mode_t)0;
1255 mode_t or_bits = (mode_t)0;
1256
1257 /* Get the initial bits to apply. */
1258
1259 if (is_directory) {
1260 and_bits = lp_dir_security_mask(params->service);
1261 or_bits = lp_force_dir_security_mode(params->service);
1262 } else {
1263 and_bits = lp_security_mask(params->service);
1264 or_bits = lp_force_security_mode(params->service);
1265 }
1266
1267 /* Now bounce them into the S_USR space. */
1268 switch(type) {
1269 case S_IRUSR:
1270 /* Ensure owner has read access. */
1271 pace->perms |= S_IRUSR;
1272 if (is_directory)
1273 pace->perms |= (S_IWUSR|S_IXUSR);
1274 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1275 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1276 break;
1277 case S_IRGRP:
1278 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1279 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1280 break;
1281 case S_IROTH:
1282 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1283 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1284 break;
1285 }
1286
1287 pace->perms = ((pace->perms & and_bits)|or_bits);
1288 }
1289
1290 /****************************************************************************
1291 Check if a given uid/SID is in a group gid/SID. This is probably very
1292 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1293 ****************************************************************************/
1294
1295 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1296 {
1297 const char *u_name = NULL;
1298
1299 /* "Everyone" always matches every uid. */
1300
1301 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1302 return True;
1303
1304 /*
1305 * if it's the current user, we already have the unix token
1306 * and don't need to do the complex user_in_group_sid() call
1307 */
1308 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1309 const UNIX_USER_TOKEN *curr_utok = NULL;
1310 size_t i;
1311
1312 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1313 return True;
1314 }
1315
1316 curr_utok = get_current_utok(conn);
1317 for (i=0; i < curr_utok->ngroups; i++) {
1318 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1319 return True;
1320 }
1321 }
1322 }
1323
1324 /* u_name talloc'ed off tos. */
1325 u_name = uidtoname(uid_ace->unix_ug.uid);
1326 if (!u_name) {
1327 return False;
1328 }
1329
1330 /*
1331 * user_in_group_sid() uses create_token_from_username()
1332 * which creates an artificial NT token given just a username,
1333 * so this is not reliable for users from foreign domains
1334 * exported by winbindd!
1335 */
1336 return user_in_group_sid(u_name, &group_ace->trustee);
1337 }
1338
1339 /****************************************************************************
1340 A well formed POSIX file or default ACL has at least 3 entries, a
1341 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1342 In addition, the owner must always have at least read access.
1343 When using this call on get_acl, the pst struct is valid and contains
1344 the mode of the file. When using this call on set_acl, the pst struct has
1345 been modified to have a mode containing the default for this file or directory
1346 type.
1347 ****************************************************************************/
1348
1349 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1350 const struct share_params *params,
1351 const bool is_directory,
1352 const struct dom_sid *pfile_owner_sid,
1353 const struct dom_sid *pfile_grp_sid,
1354 const SMB_STRUCT_STAT *pst,
1355 bool setting_acl)
1356 {
1357 canon_ace *pace;
1358 bool got_user = False;
1359 bool got_grp = False;
1360 bool got_other = False;
1361 canon_ace *pace_other = NULL;
1362
1363 for (pace = *pp_ace; pace; pace = pace->next) {
1364 if (pace->type == SMB_ACL_USER_OBJ) {
1365
1366 if (setting_acl)
1367 apply_default_perms(params, is_directory, pace, S_IRUSR);
1368 got_user = True;
1369
1370 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1371
1372 /*
1373 * Ensure create mask/force create mode is respected on set.
1374 */
1375
1376 if (setting_acl)
1377 apply_default_perms(params, is_directory, pace, S_IRGRP);
1378 got_grp = True;
1379
1380 } else if (pace->type == SMB_ACL_OTHER) {
1381
1382 /*
1383 * Ensure create mask/force create mode is respected on set.
1384 */
1385
1386 if (setting_acl)
1387 apply_default_perms(params, is_directory, pace, S_IROTH);
1388 got_other = True;
1389 pace_other = pace;
1390 }
1391 }
1392
1393 if (!got_user) {
1394 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1395 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1396 return False;
1397 }
1398
1399 ZERO_STRUCTP(pace);
1400 pace->type = SMB_ACL_USER_OBJ;
1401 pace->owner_type = UID_ACE;
1402 pace->unix_ug.uid = pst->st_ex_uid;
1403 pace->trustee = *pfile_owner_sid;
1404 pace->attr = ALLOW_ACE;
1405
1406 if (setting_acl) {
1407 /* See if the owning user is in any of the other groups in
1408 the ACE. If so, OR in the permissions from that group. */
1409
1410 bool group_matched = False;
1411 canon_ace *pace_iter;
1412
1413 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1414 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1415 if (uid_entry_in_group(conn, pace, pace_iter)) {
1416 pace->perms |= pace_iter->perms;
1417 group_matched = True;
1418 }
1419 }
1420 }
1421
1422 /* If we only got an "everyone" perm, just use that. */
1423 if (!group_matched) {
1424 if (got_other)
1425 pace->perms = pace_other->perms;
1426 else
1427 pace->perms = 0;
1428 }
1429
1430 apply_default_perms(params, is_directory, pace, S_IRUSR);
1431 } else {
1432 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1433 }
1434
1435 DLIST_ADD(*pp_ace, pace);
1436 }
1437
1438 if (!got_grp) {
1439 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1440 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1441 return False;
1442 }
1443
1444 ZERO_STRUCTP(pace);
1445 pace->type = SMB_ACL_GROUP_OBJ;
1446 pace->owner_type = GID_ACE;
1447 pace->unix_ug.uid = pst->st_ex_gid;
1448 pace->trustee = *pfile_grp_sid;
1449 pace->attr = ALLOW_ACE;
1450 if (setting_acl) {
1451 /* If we only got an "everyone" perm, just use that. */
1452 if (got_other)
1453 pace->perms = pace_other->perms;
1454 else
1455 pace->perms = 0;
1456 apply_default_perms(params, is_directory, pace, S_IRGRP);
1457 } else {
1458 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1459 }
1460
1461 DLIST_ADD(*pp_ace, pace);
1462 }
1463
1464 if (!got_other) {
1465 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1466 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1467 return False;
1468 }
1469
1470 ZERO_STRUCTP(pace);
1471 pace->type = SMB_ACL_OTHER;
1472 pace->owner_type = WORLD_ACE;
1473 pace->unix_ug.world = -1;
1474 pace->trustee = global_sid_World;
1475 pace->attr = ALLOW_ACE;
1476 if (setting_acl) {
1477 pace->perms = 0;
1478 apply_default_perms(params, is_directory, pace, S_IROTH);
1479 } else
1480 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1481
1482 DLIST_ADD(*pp_ace, pace);
1483 }
1484
1485 return True;
1486 }
1487
1488 /****************************************************************************
1489 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1490 If it does not have them, check if there are any entries where the trustee is the
1491 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1492 ****************************************************************************/
1493
1494 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1495 {
1496 bool got_user_obj, got_group_obj;
1497 canon_ace *current_ace;
1498 int i, entries;
1499
1500 entries = count_canon_ace_list(ace);
1501 got_user_obj = False;
1502 got_group_obj = False;
1503
1504 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1505 if (current_ace->type == SMB_ACL_USER_OBJ)
1506 got_user_obj = True;
1507 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1508 got_group_obj = True;
1509 }
1510 if (got_user_obj && got_group_obj) {
1511 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1512 return;
1513 }
1514
1515 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1516 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1517 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1518 current_ace->type = SMB_ACL_USER_OBJ;
1519 got_user_obj = True;
1520 }
1521 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1522 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1523 current_ace->type = SMB_ACL_GROUP_OBJ;
1524 got_group_obj = True;
1525 }
1526 }
1527 if (!got_user_obj)
1528 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1529 if (!got_group_obj)
1530 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1531 }
1532
1533 /****************************************************************************
1534 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1535 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1536 ****************************************************************************/
1537
1538 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1539 {
1540 /* dir ace must be followings.
1541 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1542 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1543 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1544 Posix ACL u:trustee:perm
1545
1546 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1547 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1548 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1549 Posix ACL g:trustee:perm
1550 */
1551
1552 if (ace->type == SMB_ACL_USER_OBJ &&
1553 !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1554 canon_ace *dup_ace = dup_canon_ace(ace);
1555
1556 if (dup_ace == NULL) {
1557 return false;
1558 }
1559 dup_ace->type = SMB_ACL_USER;
1560 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1561 }
1562
1563 if (ace->type == SMB_ACL_GROUP_OBJ &&
1564 !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1565 canon_ace *dup_ace = dup_canon_ace(ace);
1566
1567 if (dup_ace == NULL) {
1568 return false;
1569 }
1570 dup_ace->type = SMB_ACL_GROUP;
1571 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1572 }
1573
1574 return true;
1575 }
1576
1577 /****************************************************************************
1578 Unpack a struct security_descriptor into two canonical ace lists.
1579 ****************************************************************************/
1580
1581 static bool create_canon_ace_lists(files_struct *fsp,
1582 const SMB_STRUCT_STAT *pst,
1583 struct dom_sid *pfile_owner_sid,
1584 struct dom_sid *pfile_grp_sid,
1585 canon_ace **ppfile_ace,
1586 canon_ace **ppdir_ace,
1587 const struct security_acl *dacl)
1588 {
1589 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1590 canon_ace *file_ace = NULL;
1591 canon_ace *dir_ace = NULL;
1592 canon_ace *current_ace = NULL;
1593 bool got_dir_allow = False;
1594 bool got_file_allow = False;
1595 int i, j;
1596
1597 *ppfile_ace = NULL;
1598 *ppdir_ace = NULL;
1599
1600 /*
1601 * Convert the incoming ACL into a more regular form.
1602 */
1603
1604 for(i = 0; i < dacl->num_aces; i++) {
1605 struct security_ace *psa = &dacl->aces[i];
1606
1607 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1608 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1609 return False;
1610 }
1611
1612 if (nt4_compatible_acls()) {
1613 /*
1614 * The security mask may be UNIX_ACCESS_NONE which should map into
1615 * no permissions (we overload the WRITE_OWNER bit for this) or it
1616 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1617 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1618 */
1619
1620 /*
1621 * Convert GENERIC bits to specific bits.
1622 */
1623
1624 se_map_generic(&psa->access_mask, &file_generic_mapping);
1625
1626 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1627
1628 if(psa->access_mask != UNIX_ACCESS_NONE)
1629 psa->access_mask &= ~UNIX_ACCESS_NONE;
1630 }
1631 }
1632
1633 /*
1634 * Deal with the fact that NT 4.x re-writes the canonical format
1635 * that we return for default ACLs. If a directory ACE is identical
1636 * to a inherited directory ACE then NT changes the bits so that the
1637 * first ACE is set to OI|IO and the second ACE for this SID is set
1638 * to CI. We need to repair this. JRA.
1639 */
1640
1641 for(i = 0; i < dacl->num_aces; i++) {
1642 struct security_ace *psa1 = &dacl->aces[i];
1643
1644 for (j = i + 1; j < dacl->num_aces; j++) {
1645 struct security_ace *psa2 = &dacl->aces[j];
1646
1647 if (psa1->access_mask != psa2->access_mask)
1648 continue;
1649
1650 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1651 continue;
1652
1653 /*
1654 * Ok - permission bits and SIDs are equal.
1655 * Check if flags were re-written.
1656 */
1657
1658 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1661 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1664
1665 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1666 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1667
1668 }
1669 }
1670 }
1671
1672 for(i = 0; i < dacl->num_aces; i++) {
1673 struct security_ace *psa = &dacl->aces[i];
1674
1675 /*
1676 * Create a canon_ace entry representing this NT DACL ACE.
1677 */
1678
1679 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1680 free_canon_ace_list(file_ace);
1681 free_canon_ace_list(dir_ace);
1682 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1683 return False;
1684 }
1685
1686 ZERO_STRUCTP(current_ace);
1687
1688 sid_copy(&current_ace->trustee, &psa->trustee);
1689
1690 /*
1691 * Try and work out if the SID is a user or group
1692 * as we need to flag these differently for POSIX.
1693 * Note what kind of a POSIX ACL this should map to.
1694 */
1695
1696 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1697 current_ace->owner_type = WORLD_ACE;
1698 current_ace->unix_ug.world = -1;
1699 current_ace->type = SMB_ACL_OTHER;
1700 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1701 current_ace->owner_type = UID_ACE;
1702 current_ace->unix_ug.uid = pst->st_ex_uid;
1703 current_ace->type = SMB_ACL_USER_OBJ;
1704
1705 /*
1706 * The Creator Owner entry only specifies inheritable permissions,
1707 * never access permissions. WinNT doesn't always set the ACE to
1708 * INHERIT_ONLY, though.
1709 */
1710
1711 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1712
1713 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1714 current_ace->owner_type = GID_ACE;
1715 current_ace->unix_ug.gid = pst->st_ex_gid;
1716 current_ace->type = SMB_ACL_GROUP_OBJ;
1717
1718 /*
1719 * The Creator Group entry only specifies inheritable permissions,
1720 * never access permissions. WinNT doesn't always set the ACE to
1721 * INHERIT_ONLY, though.
1722 */
1723 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1724
1725 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1726 current_ace->owner_type = UID_ACE;
1727 /* If it's the owning user, this is a user_obj, not
1728 * a user. */
1729 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1730 current_ace->type = SMB_ACL_USER_OBJ;
1731 } else {
1732 current_ace->type = SMB_ACL_USER;
1733 }
1734 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1735 current_ace->owner_type = GID_ACE;
1736 /* If it's the primary group, this is a group_obj, not
1737 * a group. */
1738 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1739 current_ace->type = SMB_ACL_GROUP_OBJ;
1740 } else {
1741 current_ace->type = SMB_ACL_GROUP;
1742 }
1743 } else {
1744 /*
1745 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1746 */
1747
1748 if (non_mappable_sid(&psa->trustee)) {
1749 DEBUG(10, ("create_canon_ace_lists: ignoring "
1750 "non-mappable SID %s\n",
1751 sid_string_dbg(&psa->trustee)));
1752 SAFE_FREE(current_ace);
1753 continue;
1754 }
1755
1756 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1757 DEBUG(10, ("create_canon_ace_lists: ignoring "
1758 "unknown or foreign SID %s\n",
1759 sid_string_dbg(&psa->trustee)));
1760 SAFE_FREE(current_ace);
1761 continue;
1762 }
1763
1764 free_canon_ace_list(file_ace);
1765 free_canon_ace_list(dir_ace);
1766 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1767 "%s to uid or gid.\n",
1768 sid_string_dbg(&current_ace->trustee)));
1769 SAFE_FREE(current_ace);
1770 return False;
1771 }
1772
1773 /*
1774 * Map the given NT permissions into a UNIX mode_t containing only
1775 * S_I(R|W|X)USR bits.
1776 */
1777
1778 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1779 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1780
1781 /* Store the ace_flag. */
1782 current_ace->ace_flags = psa->flags;
1783
1784 /*
1785 * Now add the created ace to either the file list, the directory
1786 * list, or both. We *MUST* preserve the order here (hence we use
1787 * DLIST_ADD_END) as NT ACLs are order dependent.
1788 */
1789
1790 if (fsp->is_directory) {
1791
1792 /*
1793 * We can only add to the default POSIX ACE list if the ACE is
1794 * designed to be inherited by both files and directories.
1795 */
1796
1797 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1798 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1799
1800 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1801
1802 /*
1803 * Note if this was an allow ace. We can't process
1804 * any further deny ace's after this.
1805 */
1806
1807 if (current_ace->attr == ALLOW_ACE)
1808 got_dir_allow = True;
1809
1810 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1811 DEBUG(0,("create_canon_ace_lists: "
1812 "malformed ACL in "
1813 "inheritable ACL! Deny entry "
1814 "after Allow entry. Failing "
1815 "to set on file %s.\n",
1816 fsp_str_dbg(fsp)));
1817 free_canon_ace_list(file_ace);
1818 free_canon_ace_list(dir_ace);
1819 return False;
1820 }
1821
1822 if( DEBUGLVL( 10 )) {
1823 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1824 print_canon_ace( current_ace, 0);
1825 }
1826
1827 /*
1828 * We have a lossy mapping: directory ACE entries
1829 * CREATOR_OWNER ------\
1830 * (map to) +---> SMB_ACL_USER_OBJ
1831 * owning sid ------/
1832 *
1833 * CREATOR_GROUP ------\
1834 * (map to) +---> SMB_ACL_GROUP_OBJ
1835 * primary group sid --/
1836 *
1837 * on set. And on read of a directory ACL
1838 *
1839 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1840 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1841 *
1842 * Deal with this on set by duplicating
1843 * owning sid and primary group sid ACE
1844 * entries into the directory ACL.
1845 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1846 */
1847
1848 if (!dup_owning_ace(dir_ace, current_ace)) {
1849 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1850 free_canon_ace_list(file_ace);
1851 free_canon_ace_list(dir_ace);
1852 return false;
1853 }
1854
1855 /*
1856 * If this is not an inherit only ACE we need to add a duplicate
1857 * to the file acl.
1858 */
1859
1860 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1861 canon_ace *dup_ace = dup_canon_ace(current_ace);
1862
1863 if (!dup_ace) {
1864 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1865 free_canon_ace_list(file_ace);
1866 free_canon_ace_list(dir_ace);
1867 return False;
1868 }
1869
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 = dup_ace;
1875 /* We've essentially split this ace into two,
1876 * and added the ace with inheritance request
1877 * bits to the directory ACL. Drop those bits for
1878 * the ACE we're adding to the file list. */
1879 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1880 SEC_ACE_FLAG_CONTAINER_INHERIT|
1881 SEC_ACE_FLAG_INHERIT_ONLY);
1882 } else {
1883 /*
1884 * We must not free current_ace here as its
1885 * pointer is now owned by the dir_ace list.
1886 */
1887 current_ace = NULL;
1888 }
1889 }
1890 }
1891
1892 /*
1893 * Only add to the file ACL if not inherit only.
1894 */
1895
1896 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1897 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1898
1899 /*
1900 * Note if this was an allow ace. We can't process
1901 * any further deny ace's after this.
1902 */
1903
1904 if (current_ace->attr == ALLOW_ACE)
1905 got_file_allow = True;
1906
1907 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1908 DEBUG(0,("create_canon_ace_lists: malformed "
1909 "ACL in file ACL ! Deny entry after "
1910 "Allow entry. Failing to set on file "
1911 "%s.\n", fsp_str_dbg(fsp)));
1912 free_canon_ace_list(file_ace);
1913 free_canon_ace_list(dir_ace);
1914 return False;
1915 }
1916
1917 if( DEBUGLVL( 10 )) {
1918 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1919 print_canon_ace( current_ace, 0);
1920 }
1921 all_aces_are_inherit_only = False;
1922 /*
1923 * We must not free current_ace here as its
1924 * pointer is now owned by the file_ace list.
1925 */
1926 current_ace = NULL;
1927 }
1928
1929 /*
1930 * Free if ACE was not added.
1931 */
1932
1933 SAFE_FREE(current_ace);
1934 }
1935
1936 if (fsp->is_directory && all_aces_are_inherit_only) {
1937 /*
1938 * Windows 2000 is doing one of these weird 'inherit acl'
1939 * traverses to conserve NTFS ACL resources. Just pretend
1940 * there was no DACL sent. JRA.
1941 */
1942
1943 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1944 free_canon_ace_list(file_ace);
1945 free_canon_ace_list(dir_ace);
1946 file_ace = NULL;
1947 dir_ace = NULL;
1948 } else {
1949 /*
1950 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1951 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1952 * entries can be converted to *_OBJ. Usually we will already have these
1953 * entries in the Default ACL, and the Access ACL will not have them.
1954 */
1955 if (file_ace) {
1956 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1957 }
1958 if (dir_ace) {
1959 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1960 }
1961 }
1962
1963 *ppfile_ace = file_ace;
1964 *ppdir_ace = dir_ace;
1965
1966 return True;
1967 }
1968
1969 /****************************************************************************
1970 ASCII art time again... JRA :-).
1971
1972 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1973 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1974 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1975 allow or deny have been merged, so the same SID can only appear once in the deny
1976 list or once in the allow list.
1977
1978 We then process as follows :
1979
1980 ---------------------------------------------------------------------------
1981 First pass - look for a Everyone DENY entry.
1982
1983 If it is deny all (rwx) trunate the list at this point.
1984 Else, walk the list from this point and use the deny permissions of this
1985 entry as a mask on all following allow entries. Finally, delete
1986 the Everyone DENY entry (we have applied it to everything possible).
1987
1988 In addition, in this pass we remove any DENY entries that have
1989 no permissions (ie. they are a DENY nothing).
1990 ---------------------------------------------------------------------------
1991 Second pass - only deal with deny user entries.
1992
1993 DENY user1 (perms XXX)
1994
1995 new_perms = 0
1996 for all following allow group entries where user1 is in group
1997 new_perms |= group_perms;
1998
1999 user1 entry perms = new_perms & ~ XXX;
2000
2001 Convert the deny entry to an allow entry with the new perms and
2002 push to the end of the list. Note if the user was in no groups
2003 this maps to a specific allow nothing entry for this user.
2004
2005 The common case from the NT ACL choser (userX deny all) is
2006 optimised so we don't do the group lookup - we just map to
2007 an allow nothing entry.
2008
2009 What we're doing here is inferring the allow permissions the
2010 person setting the ACE on user1 wanted by looking at the allow
2011 permissions on the groups the user is currently in. This will
2012 be a snapshot, depending on group membership but is the best
2013 we can do and has the advantage of failing closed rather than
2014 open.
2015 ---------------------------------------------------------------------------
2016 Third pass - only deal with deny group entries.
2017
2018 DENY group1 (perms XXX)
2019
2020 for all following allow user entries where user is in group1
2021 user entry perms = user entry perms & ~ XXX;
2022
2023 If there is a group Everyone allow entry with permissions YYY,
2024 convert the group1 entry to an allow entry and modify its
2025 permissions to be :
2026
2027 new_perms = YYY & ~ XXX
2028
2029 and push to the end of the list.
2030
2031 If there is no group Everyone allow entry then convert the
2032 group1 entry to a allow nothing entry and push to the end of the list.
2033
2034 Note that the common case from the NT ACL choser (groupX deny all)
2035 cannot be optimised here as we need to modify user entries who are
2036 in the group to change them to a deny all also.
2037
2038 What we're doing here is modifying the allow permissions of
2039 user entries (which are more specific in POSIX ACLs) to mask
2040 out the explicit deny set on the group they are in. This will
2041 be a snapshot depending on current group membership but is the
2042 best we can do and has the advantage of failing closed rather
2043 than open.
2044 ---------------------------------------------------------------------------
2045 Fourth pass - cope with cumulative permissions.
2046
2047 for all allow user entries, if there exists an allow group entry with
2048 more permissive permissions, and the user is in that group, rewrite the
2049 allow user permissions to contain both sets of permissions.
2050
2051 Currently the code for this is #ifdef'ed out as these semantics make
2052 no sense to me. JRA.
2053 ---------------------------------------------------------------------------
2054
2055 Note we *MUST* do the deny user pass first as this will convert deny user
2056 entries into allow user entries which can then be processed by the deny
2057 group pass.
2058
2059 The above algorithm took a *lot* of thinking about - hence this
2060 explaination :-). JRA.
2061 ****************************************************************************/
2062
2063 /****************************************************************************
2064 Process a canon_ace list entries. This is very complex code. We need
2065 to go through and remove the "deny" permissions from any allow entry that matches
2066 the id of this entry. We have already refused any NT ACL that wasn't in correct
2067 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2068 we just remove it (to fail safe). We have already removed any duplicate ace
2069 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2070 allow entries.
2071 ****************************************************************************/
2072
2073 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2074 {
2075 canon_ace *ace_list = *pp_ace_list;
2076 canon_ace *curr_ace = NULL;
2077 canon_ace *curr_ace_next = NULL;
2078
2079 /* Pass 1 above - look for an Everyone, deny entry. */
2080
2081 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2082 canon_ace *allow_ace_p;
2083
2084 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2085
2086 if (curr_ace->attr != DENY_ACE)
2087 continue;
2088
2089 if (curr_ace->perms == (mode_t)0) {
2090
2091 /* Deny nothing entry - delete. */
2092
2093 DLIST_REMOVE(ace_list, curr_ace);
2094 continue;
2095 }
2096
2097 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2098 continue;
2099
2100 /* JRATEST - assert. */
2101 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2102
2103 if (curr_ace->perms == ALL_ACE_PERMS) {
2104
2105 /*
2106 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2107 * list at this point including this entry.
2108 */
2109
2110 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2111
2112 free_canon_ace_list( curr_ace );
2113 if (prev_entry)
2114 DLIST_REMOVE(ace_list, prev_entry);
2115 else {
2116 /* We deleted the entire list. */
2117 ace_list = NULL;
2118 }
2119 break;
2120 }
2121
2122 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2123
2124 /*
2125 * Only mask off allow entries.
2126 */
2127
2128 if (allow_ace_p->attr != ALLOW_ACE)
2129 continue;
2130
2131 allow_ace_p->perms &= ~curr_ace->perms;
2132 }
2133
2134 /*
2135 * Now it's been applied, remove it.
2136 */
2137
2138 DLIST_REMOVE(ace_list, curr_ace);
2139 }
2140
2141 /* Pass 2 above - deal with deny user entries. */
2142
2143 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2144 mode_t new_perms = (mode_t)0;
2145 canon_ace *allow_ace_p;
2146
2147 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2148
2149 if (curr_ace->attr != DENY_ACE)
2150 continue;
2151
2152 if (curr_ace->owner_type != UID_ACE)
2153 continue;
2154
2155 if (curr_ace->perms == ALL_ACE_PERMS) {
2156
2157 /*
2158 * Optimisation - this is a deny everything to this user.
2159 * Convert to an allow nothing and push to the end of the list.
2160 */
2161
2162 curr_ace->attr = ALLOW_ACE;
2163 curr_ace->perms = (mode_t)0;
2164 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2165 continue;
2166 }
2167
2168 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2169
2170 if (allow_ace_p->attr != ALLOW_ACE)
2171 continue;
2172
2173 /* We process GID_ACE and WORLD_ACE entries only. */
2174
2175 if (allow_ace_p->owner_type == UID_ACE)
2176 continue;
2177
2178 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2179 new_perms |= allow_ace_p->perms;
2180 }
2181
2182 /*
2183 * Convert to a allow entry, modify the perms and push to the end
2184 * of the list.
2185 */
2186
2187 curr_ace->attr = ALLOW_ACE;
2188 curr_ace->perms = (new_perms & ~curr_ace->perms);
2189 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2190 }
2191
2192 /* Pass 3 above - deal with deny group entries. */
2193
2194 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2195 canon_ace *allow_ace_p;
2196 canon_ace *allow_everyone_p = NULL;
2197
2198 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2199
2200 if (curr_ace->attr != DENY_ACE)
2201 continue;
2202
2203 if (curr_ace->owner_type != GID_ACE)
2204 continue;
2205
2206 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2207
2208 if (allow_ace_p->attr != ALLOW_ACE)
2209 continue;
2210
2211 /* Store a pointer to the Everyone allow, if it exists. */
2212 if (allow_ace_p->owner_type == WORLD_ACE)
2213 allow_everyone_p = allow_ace_p;
2214
2215 /* We process UID_ACE entries only. */
2216
2217 if (allow_ace_p->owner_type != UID_ACE)
2218 continue;
2219
2220 /* Mask off the deny group perms. */
2221
2222 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2223 allow_ace_p->perms &= ~curr_ace->perms;
2224 }
2225
2226 /*
2227 * Convert the deny to an allow with the correct perms and
2228 * push to the end of the list.
2229 */
2230
2231 curr_ace->attr = ALLOW_ACE;
2232 if (allow_everyone_p)
2233 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2234 else
2235 curr_ace->perms = (mode_t)0;
2236 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2237 }
2238
2239 /* Doing this fourth pass allows Windows semantics to be layered
2240 * on top of POSIX semantics. I'm not sure if this is desirable.
2241 * For example, in W2K ACLs there is no way to say, "Group X no
2242 * access, user Y full access" if user Y is a member of group X.
2243 * This seems completely broken semantics to me.... JRA.
2244 */
2245
2246 #if 0
2247 /* Pass 4 above - deal with allow entries. */
2248
2249 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2250 canon_ace *allow_ace_p;
2251
2252 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2253
2254 if (curr_ace->attr != ALLOW_ACE)
2255 continue;
2256
2257 if (curr_ace->owner_type != UID_ACE)
2258 continue;
2259
2260 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2261
2262 if (allow_ace_p->attr != ALLOW_ACE)
2263 continue;
2264
2265 /* We process GID_ACE entries only. */
2266
2267 if (allow_ace_p->owner_type != GID_ACE)
2268 continue;
2269
2270 /* OR in the group perms. */
2271
2272 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2273 curr_ace->perms |= allow_ace_p->perms;
2274 }
2275 }
2276 #endif
2277
2278 *pp_ace_list = ace_list;
2279 }
2280
2281 /****************************************************************************
2282 Create a default mode that will be used if a security descriptor entry has
2283 no user/group/world entries.
2284 ****************************************************************************/
2285
2286 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2287 {
2288 int snum = SNUM(fsp->conn);
2289 mode_t and_bits = (mode_t)0;
2290 mode_t or_bits = (mode_t)0;
2291 mode_t mode;
2292
2293 if (interitable_mode) {
2294 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2295 fsp->fsp_name, NULL);
2296 } else {
2297 mode = S_IRUSR;
2298 }
2299
2300 if (fsp->is_directory)
2301 mode |= (S_IWUSR|S_IXUSR);
2302
2303 /*
2304 * Now AND with the create mode/directory mode bits then OR with the
2305 * force create mode/force directory mode bits.
2306 */
2307
2308 if (fsp->is_directory) {
2309 and_bits = lp_dir_security_mask(snum);
2310 or_bits = lp_force_dir_security_mode(snum);
2311 } else {
2312 and_bits = lp_security_mask(snum);
2313 or_bits = lp_force_security_mode(snum);
2314 }
2315
2316 return ((mode & and_bits)|or_bits);
2317 }
2318
2319 /****************************************************************************
2320 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2321 succeeding.
2322 ****************************************************************************/
2323
2324 static bool unpack_canon_ace(files_struct *fsp,
2325 const SMB_STRUCT_STAT *pst,
2326 struct dom_sid *pfile_owner_sid,
2327 struct dom_sid *pfile_grp_sid,
2328 canon_ace **ppfile_ace,
2329 canon_ace **ppdir_ace,
2330 uint32 security_info_sent,
2331 const struct security_descriptor *psd)
2332 {
2333 SMB_STRUCT_STAT st;
2334 canon_ace *file_ace = NULL;
2335 canon_ace *dir_ace = NULL;
2336
2337 *ppfile_ace = NULL;
2338 *ppdir_ace = NULL;
2339
2340 if(security_info_sent == 0) {
2341 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2342 return False;
2343 }
2344
2345 /*
2346 * If no DACL then this is a chown only security descriptor.
2347 */
2348
2349 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2350 return True;
2351
2352 /*
2353 * Now go through the DACL and create the canon_ace lists.
2354 */
2355
2356 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2357 &file_ace, &dir_ace, psd->dacl))
2358 return False;
2359
2360 if ((file_ace == NULL) && (dir_ace == NULL)) {
2361 /* W2K traverse DACL set - ignore. */
2362 return True;
2363 }
2364
2365 /*
2366 * Go through the canon_ace list and merge entries
2367 * belonging to identical users of identical allow or deny type.
2368 * We can do this as all deny entries come first, followed by
2369 * all allow entries (we have mandated this before accepting this acl).
2370 */
2371
2372 print_canon_ace_list( "file ace - before merge", file_ace);
2373 merge_aces( &file_ace, false);
2374
2375 print_canon_ace_list( "dir ace - before merge", dir_ace);
2376 merge_aces( &dir_ace, true);
2377
2378 /*
2379 * NT ACLs are order dependent. Go through the acl lists and
2380 * process DENY entries by masking the allow entries.
2381 */
2382
2383 print_canon_ace_list( "file ace - before deny", file_ace);
2384 process_deny_list(fsp->conn, &file_ace);
2385
2386 print_canon_ace_list( "dir ace - before deny", dir_ace);
2387 process_deny_list(fsp->conn, &dir_ace);
2388
2389 /*
2390 * A well formed POSIX file or default ACL has at least 3 entries, a
2391 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2392 * and optionally a mask entry. Ensure this is the case.
2393 */
2394
2395 print_canon_ace_list( "file ace - before valid", file_ace);
2396
2397 st = *pst;
2398
2399 /*
2400 * A default 3 element mode entry for a file should be r-- --- ---.
2401 * A default 3 element mode entry for a directory should be rwx --- ---.
2402 */
2403
2404 st.st_ex_mode = create_default_mode(fsp, False);
2405
2406 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2407 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2408 free_canon_ace_list(file_ace);
2409 free_canon_ace_list(dir_ace);
2410 return False;
2411 }
2412
2413 print_canon_ace_list( "dir ace - before valid", dir_ace);
2414
2415 /*
2416 * A default inheritable 3 element mode entry for a directory should be the
2417 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2418 * it's a directory.
2419 */
2420
2421 st.st_ex_mode = create_default_mode(fsp, True);
2422
2423 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2424 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2425 free_canon_ace_list(file_ace);
2426 free_canon_ace_list(dir_ace);
2427 return False;
2428 }
2429
2430 print_canon_ace_list( "file ace - return", file_ace);
2431 print_canon_ace_list( "dir ace - return", dir_ace);
2432
2433 *ppfile_ace = file_ace;
2434 *ppdir_ace = dir_ace;
2435 return True;
2436
2437 }
2438
2439 /******************************************************************************
2440 When returning permissions, try and fit NT display
2441 semantics if possible. Note the the canon_entries here must have been malloced.
2442 The list format should be - first entry = owner, followed by group and other user
2443 entries, last entry = other.
2444
2445 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2446 are not ordered, and match on the most specific entry rather than walking a list,
2447 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2448
2449 Entry 0: owner : deny all except read and write.
2450 Entry 1: owner : allow read and write.
2451 Entry 2: group : deny all except read.
2452 Entry 3: group : allow read.
2453 Entry 4: Everyone : allow read.
2454
2455 But NT cannot display this in their ACL editor !
2456 ********************************************************************************/
2457
2458 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2459 {
2460 canon_ace *l_head = *pp_list_head;
2461 canon_ace *owner_ace = NULL;
2462 canon_ace *other_ace = NULL;
2463 canon_ace *ace = NULL;
2464
2465 for (ace = l_head; ace; ace = ace->next) {
2466 if (ace->type == SMB_ACL_USER_OBJ)
2467 owner_ace = ace;
2468 else if (ace->type == SMB_ACL_OTHER) {
2469 /* Last ace - this is "other" */
2470 other_ace = ace;
2471 }
2472 }
2473
2474 if (!owner_ace || !other_ace) {
2475 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2476 filename ));
2477 return;
2478 }
2479
2480 /*
2481 * The POSIX algorithm applies to owner first, and other last,
2482 * so ensure they are arranged in this order.
2483 */
2484
2485 if (owner_ace) {
2486 DLIST_PROMOTE(l_head, owner_ace);
2487 }
2488
2489 if (other_ace) {
2490 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2491 }
2492
2493 /* We have probably changed the head of the list. */
2494
2495 *pp_list_head = l_head;
2496 }
2497
2498 /****************************************************************************
2499 Create a linked list of canonical ACE entries.
2500 ****************************************************************************/
2501
2502 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2503 const char *fname, SMB_ACL_T posix_acl,
2504 const SMB_STRUCT_STAT *psbuf,
2505 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2506 {
2507 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2508 canon_ace *l_head = NULL;
2509 canon_ace *ace = NULL;
2510 canon_ace *next_ace = NULL;
2511 int entry_id = SMB_ACL_FIRST_ENTRY;
2512 SMB_ACL_ENTRY_T entry;
2513 size_t ace_count;
2514
2515 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2516 SMB_ACL_TAG_T tagtype;
2517 SMB_ACL_PERMSET_T permset;
2518 struct dom_sid sid;
2519 posix_id unix_ug;
2520 enum ace_owner owner_type;
2521
2522 entry_id = SMB_ACL_NEXT_ENTRY;
2523
2524 /* Is this a MASK entry ? */
2525 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2526 continue;
2527
2528 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2529 continue;
2530
2531 /* Decide which SID to use based on the ACL type. */
2532 switch(tagtype) {
2533 case SMB_ACL_USER_OBJ:
2534 /* Get the SID from the owner. */
2535 sid_copy(&sid, powner);
2536 unix_ug.uid = psbuf->st_ex_uid;
2537 owner_type = UID_ACE;
2538 break;
2539 case SMB_ACL_USER:
2540 {
2541 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2542 if (puid == NULL) {
2543 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2544 continue;
2545 }
2546 uid_to_sid( &sid, *puid);
2547 unix_ug.uid = *puid;
2548 owner_type = UID_ACE;
2549 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2550 break;
2551 }
2552 case SMB_ACL_GROUP_OBJ:
2553 /* Get the SID from the owning group. */
2554 sid_copy(&sid, pgroup);
2555 unix_ug.gid = psbuf->st_ex_gid;
2556 owner_type = GID_ACE;
2557 break;
2558 case SMB_ACL_GROUP:
2559 {
2560 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2561 if (pgid == NULL) {
2562 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2563 continue;
2564 }
2565 gid_to_sid( &sid, *pgid);
2566 unix_ug.gid = *pgid;
2567 owner_type = GID_ACE;
2568 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2569 break;
2570 }
2571 case SMB_ACL_MASK:
2572 acl_mask = convert_permset_to_mode_t(conn, permset);
2573 continue; /* Don't count the mask as an entry. */
2574 case SMB_ACL_OTHER:
2575 /* Use the Everyone SID */
2576 sid = global_sid_World;
2577 unix_ug.world = -1;
2578 owner_type = WORLD_ACE;
2579 break;
2580 default:
2581 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2582 continue;
2583 }
2584
2585 /*
2586 * Add this entry to the list.
2587 */
2588
2589 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2590 goto fail;
2591
2592 ZERO_STRUCTP(ace);
2593 ace->type = tagtype;
2594 ace->perms = convert_permset_to_mode_t(conn, permset);
2595 ace->attr = ALLOW_ACE;
2596 ace->trustee = sid;
2597 ace->unix_ug = unix_ug;
2598 ace->owner_type = owner_type;
2599 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2600
2601 DLIST_ADD(l_head, ace);
2602 }
2603
2604 /*
2605 * This next call will ensure we have at least a user/group/world set.
2606 */
2607
2608 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2609 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2610 psbuf, False))
2611 goto fail;
2612
2613 /*
2614 * Now go through the list, masking the permissions with the
2615 * acl_mask. Ensure all DENY Entries are at the start of the list.
2616 */
2617
2618 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2619
2620 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2621 next_ace = ace->next;
2622
2623 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2624 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2625 ace->perms &= acl_mask;
2626
2627 if (ace->perms == 0) {
2628 DLIST_PROMOTE(l_head, ace);
2629 }
2630
2631 if( DEBUGLVL( 10 ) ) {
2632 print_canon_ace(ace, ace_count);
2633 }
2634 }
2635
2636 arrange_posix_perms(fname,&l_head );
2637
2638 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2639
2640 return l_head;
2641
2642 fail:
2643
2644 free_canon_ace_list(l_head);
2645 return NULL;
2646 }
2647
2648 /****************************************************************************
2649 Check if the current user group list contains a given group.
2650 ****************************************************************************/
2651
2652 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2653 {
2654 int i;
2655 const UNIX_USER_TOKEN *utok = get_current_utok(conn);
2656
2657 for (i = 0; i < utok->ngroups; i++) {
2658 if (utok->groups[i] == gid) {
2659 return True;
2660 }
2661 }
2662
2663 return False;
2664 }
2665
2666 /****************************************************************************
2667 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2668 ****************************************************************************/
2669
2670 static bool acl_group_override(connection_struct *conn,
2671 const struct smb_filename *smb_fname)
2672 {
2673 if ((errno != EPERM) && (errno != EACCES)) {
2674 return false;
2675 }
2676
2677 /* file primary group == user primary or supplementary group */
2678 if (lp_acl_group_control(SNUM(conn)) &&
2679 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2680 return true;
2681 }
2682
2683 /* user has writeable permission */
2684 if (lp_dos_filemode(SNUM(conn)) &&
2685 can_write_to_file(conn, smb_fname)) {
2686 return true;
2687 }
2688
2689 return false;
2690 }
2691
2692 /****************************************************************************
2693 Attempt to apply an ACL to a file or directory.
2694 ****************************************************************************/
2695
2696 static bool set_canon_ace_list(files_struct *fsp,
2697 canon_ace *the_ace,
2698 bool default_ace,
2699 const SMB_STRUCT_STAT *psbuf,
2700 bool *pacl_set_support)
2701 {
2702 connection_struct *conn = fsp->conn;
2703 bool ret = False;
2704 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2705 canon_ace *p_ace;
2706 int i;
2707 SMB_ACL_ENTRY_T mask_entry;
2708 bool got_mask_entry = False;
2709 SMB_ACL_PERMSET_T mask_permset;
2710 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2711 bool needs_mask = False;
2712 mode_t mask_perms = 0;
2713
2714 /* Use the psbuf that was passed in. */
2715 if (psbuf != &fsp->fsp_name->st) {
2716 fsp->fsp_name->st = *psbuf;
2717 }
2718
2719 #if defined(POSIX_ACL_NEEDS_MASK)
2720 /* HP-UX always wants to have a mask (called "class" there). */
2721 needs_mask = True;
2722 #endif
2723
2724 if (the_acl == NULL) {
2725
2726 if (!no_acl_syscall_error(errno)) {
2727 /*
2728 * Only print this error message if we have some kind of ACL
2729 * support that's not working. Otherwise we would always get this.
2730 */
2731 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2732 default_ace ? "default" : "file", strerror(errno) ));
2733 }
2734 *pacl_set_support = False;
2735 goto fail;
2736 }
2737
2738 if( DEBUGLVL( 10 )) {
2739 dbgtext("set_canon_ace_list: setting ACL:\n");
2740 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2741 print_canon_ace( p_ace, i);
2742 }
2743 }
2744
2745 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2746 SMB_ACL_ENTRY_T the_entry;
2747 SMB_ACL_PERMSET_T the_permset;
2748
2749 /*
2750 * ACLs only "need" an ACL_MASK entry if there are any named user or
2751 * named group entries. But if there is an ACL_MASK entry, it applies
2752 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2753 * so that it doesn't deny (i.e., mask off) any permissions.
2754 */
2755
2756 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2757 needs_mask = True;
2758 mask_perms |= p_ace->perms;
2759 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2760 mask_perms |= p_ace->perms;
2761 }
2762
2763 /*
2764 * Get the entry for this ACE.
2765 */
2766
2767 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2768 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2769 i, strerror(errno) ));
2770 goto fail;
2771 }
2772
2773 if (p_ace->type == SMB_ACL_MASK) {
2774 mask_entry = the_entry;
2775 got_mask_entry = True;
2776 }
2777
2778 /*
2779 * Ok - we now know the ACL calls should be working, don't
2780 * allow fallback to chmod.
2781 */
2782
2783 *pacl_set_support = True;
2784
2785 /*
2786 * Initialise the entry from the canon_ace.
2787 */
2788
2789 /*
2790 * First tell the entry what type of ACE this is.
2791 */
2792
2793 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2794 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2795 i, strerror(errno) ));
2796 goto fail;
2797 }
2798
2799 /*
2800 * Only set the qualifier (user or group id) if the entry is a user
2801 * or group id ACE.
2802 */
2803
2804 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2805 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2806 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2807 i, strerror(errno) ));
2808 goto fail;
2809 }
2810 }
2811
2812 /*
2813 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2814 */
2815
2816 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2817 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2818 i, strerror(errno) ));
2819 goto fail;
2820 }
2821
2822 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2823 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2824 (unsigned int)p_ace->perms, i, strerror(errno) ));
2825 goto fail;
2826 }
2827
2828 /*
2829 * ..and apply them to the entry.
2830 */
2831
2832 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2833 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2834 i, strerror(errno) ));
2835 goto fail;
2836 }
2837
2838 if( DEBUGLVL( 10 ))
2839 print_canon_ace( p_ace, i);
2840
2841 }
2842
2843 if (needs_mask && !got_mask_entry) {
2844 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2845 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2846 goto fail;
2847 }
2848
2849 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2850 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2851 goto fail;
2852 }
2853
2854 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2855 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2856 goto fail;
2857 }
2858
2859 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2860 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2861 goto fail;
2862 }
2863
2864 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2865 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2866 goto fail;
2867 }
2868 }
2869
2870 /*
2871 * Finally apply it to the file or directory.
2872 */
2873
2874 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2875 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2876 the_acl_type, the_acl) == -1) {
2877 /*
2878 * Some systems allow all the above calls and only fail with no ACL support
2879 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2880 */
2881 if (no_acl_syscall_error(errno)) {
2882 *pacl_set_support = False;
2883 }
2884
2885 if (acl_group_override(conn, fsp->fsp_name)) {
2886 int sret;
2887
2888 DEBUG(5,("set_canon_ace_list: acl group "
2889 "control on and current user in file "
2890 "%s primary group.\n",
2891 fsp_str_dbg(fsp)));
2892
2893 become_root();
2894 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2895 fsp->fsp_name->base_name, the_acl_type,
2896 the_acl);
2897 unbecome_root();
2898 if (sret == 0) {
2899 ret = True;
2900 }
2901 }
2902
2903 if (ret == False) {
2904 DEBUG(2,("set_canon_ace_list: "
2905 "sys_acl_set_file type %s failed for "
2906 "file %s (%s).\n",
2907 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2908 "directory default" : "file",
2909 fsp_str_dbg(fsp), strerror(errno)));
2910 goto fail;
2911 }
2912 }
2913 } else {
2914 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2915 /*
2916 * Some systems allow all the above calls and only fail with no ACL support
2917 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2918 */
2919 if (no_acl_syscall_error(errno)) {
2920 *pacl_set_support = False;
2921 }
2922
2923 if (acl_group_override(conn, fsp->fsp_name)) {
2924 int sret;
2925
2926 DEBUG(5,("set_canon_ace_list: acl group "
2927 "control on and current user in file "
2928 "%s primary group.\n",
2929 fsp_str_dbg(fsp)));
2930
2931 become_root();
2932 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2933 unbecome_root();
2934 if (sret == 0) {
2935 ret = True;
2936 }
2937 }
2938
2939 if (ret == False) {
2940 DEBUG(2,("set_canon_ace_list: "
2941 "sys_acl_set_file failed for file %s "
2942 "(%s).\n",
2943 fsp_str_dbg(fsp), strerror(errno)));
2944 goto fail;
2945 }
2946 }
2947 }
2948
2949 ret = True;
2950
2951 fail:
2952
2953 if (the_acl != NULL) {
2954 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2955 }
2956
2957 return ret;
2958 }
2959
2960 /****************************************************************************
2961 Find a particular canon_ace entry.
2962 ****************************************************************************/
2963
2964 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2965 {
2966 while (list) {
2967 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2968 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2969 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2970 break;
2971 list = list->next;
2972 }
2973 return list;
2974 }
2975
2976 /****************************************************************************
2977
2978 ****************************************************************************/
2979
2980 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2981 {
2982 SMB_ACL_ENTRY_T entry;
2983
2984 if (!the_acl)
2985 return NULL;
2986 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2987 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2988 return NULL;
2989 }
2990 return the_acl;
2991 }
2992
2993 /****************************************************************************
2994 Convert a canon_ace to a generic 3 element permission - if possible.
2995 ****************************************************************************/
2996
2997 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2998
2999 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3000 {
3001 int snum = SNUM(fsp->conn);
3002 size_t ace_count = count_canon_ace_list(file_ace_list);
3003 canon_ace *ace_p;
3004 canon_ace *owner_ace = NULL;
3005 canon_ace *group_ace = NULL;
3006 canon_ace *other_ace = NULL;
3007 mode_t and_bits;
3008 mode_t or_bits;
3009
3010 if (ace_count != 3) {
3011 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3012 "entries for file %s to convert to posix perms.\n",
3013 fsp_str_dbg(fsp)));
3014 return False;
3015 }
3016
3017 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3018 if (ace_p->owner_type == UID_ACE)
3019 owner_ace = ace_p;
3020 else if (ace_p->owner_type == GID_ACE)
3021 group_ace = ace_p;
3022 else if (ace_p->owner_type == WORLD_ACE)
3023 other_ace = ace_p;
3024 }
3025
3026 if (!owner_ace || !group_ace || !other_ace) {
3027 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3028 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3029 return False;
3030 }
3031
3032 *posix_perms = (mode_t)0;
3033
3034 *posix_perms |= owner_ace->perms;
3035 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3036 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3037 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3038 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3039 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3040 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3041
3042 /* The owner must have at least read access. */
3043
3044 *posix_perms |= S_IRUSR;
3045 if (fsp->is_directory)
3046 *posix_perms |= (S_IWUSR|S_IXUSR);
3047
3048 /* If requested apply the masks. */
3049
3050 /* Get the initial bits to apply. */
3051
3052 if (fsp->is_directory) {
3053 and_bits = lp_dir_security_mask(snum);
3054 or_bits = lp_force_dir_security_mode(snum);
3055 } else {
3056 and_bits = lp_security_mask(snum);
3057 or_bits = lp_force_security_mode(snum);
3058 }
3059
3060 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3061
3062 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3063 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3064 (int)group_ace->perms, (int)other_ace->perms,
3065 (int)*posix_perms, fsp_str_dbg(fsp)));
3066
3067 return True;
3068 }
3069
3070 /****************************************************************************
3071 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3072 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3073 with CI|OI set so it is inherited and also applies to the directory.
3074 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3075 ****************************************************************************/
3076
3077 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3078 {
3079 size_t i, j;
3080
3081 for (i = 0; i < num_aces; i++) {
3082 for (j = i+1; j < num_aces; j++) {
3083 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3084 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3085 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3086 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3087
3088 /* We know the lower number ACE's are file entries. */
3089 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3090 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3091 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3092 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3093 (i_inh == j_inh) &&
3094 (i_flags_ni == 0) &&
3095 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3096 SEC_ACE_FLAG_CONTAINER_INHERIT|
3097 SEC_ACE_FLAG_INHERIT_ONLY))) {
3098 /*
3099 * W2K wants to have access allowed zero access ACE's
3100 * at the end of the list. If the mask is zero, merge
3101 * the non-inherited ACE onto the inherited ACE.
3102 */
3103
3104 if (nt_ace_list[i].access_mask == 0) {
3105 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3106 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3107 if (num_aces - i - 1 > 0)
3108 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3109 sizeof(struct security_ace));
3110
3111 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3112 (unsigned int)i, (unsigned int)j ));
3113 } else {
3114 /*
3115 * These are identical except for the flags.
3116 * Merge the inherited ACE onto the non-inherited ACE.
3117 */
3118
3119 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3120 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3121 if (num_aces - j - 1 > 0)
3122 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3123 sizeof(struct security_ace));
3124
3125 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3126 (unsigned int)j, (unsigned int)i ));
3127 }
3128 num_aces--;
3129 break;
3130 }
3131 }
3132 }
3133
3134 return num_aces;
3135 }
3136
3137 /*
3138 * Add or Replace ACE entry.
3139 * In some cases we need to add a specific ACE for compatibility reasons.
3140 * When doing that we must make sure we are not actually creating a duplicate
3141 * entry. So we need to search whether an ACE entry already exist and eventually
3142 * replacce the access mask, or add a completely new entry if none was found.
3143 *
3144 * This function assumes the array has enough space to add a new entry without
3145 * any reallocation of memory.
3146 */
3147
3148 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3149 const struct dom_sid *sid, enum security_ace_type type,
3150 uint32_t mask, uint8_t flags)
3151 {
3152 int i;
3153
3154 /* first search for a duplicate */
3155 for (i = 0; i < *num_aces; i++) {
3156 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3157 (nt_ace_list[i].flags == flags)) break;
3158 }
3159
3160 if (i < *num_aces) { /* found */
3161 nt_ace_list[i].type = type;
3162 nt_ace_list[i].access_mask = mask;
3163 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3164 i, sid_string_dbg(sid), flags));
3165 return;
3166 }
3167
3168 /* not found, append it */
3169 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3170 }
3171
3172
3173 /****************************************************************************
3174 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3175 the space for the return elements and returns the size needed to return the
3176 security descriptor. This should be the only external function needed for
3177 the UNIX style get ACL.
3178 ****************************************************************************/
3179
3180 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3181 const char *name,
3182 const SMB_STRUCT_STAT *sbuf,
3183 struct pai_val *pal,
3184 SMB_ACL_T posix_acl,
3185 SMB_ACL_T def_acl,
3186 uint32_t security_info,
3187 struct security_descriptor **ppdesc)
3188 {
3189 struct dom_sid owner_sid;
3190 struct dom_sid group_sid;
3191 size_t sd_size = 0;
3192 struct security_acl *psa = NULL;
3193 size_t num_acls = 0;
3194 size_t num_def_acls = 0;
3195 size_t num_aces = 0;
3196 canon_ace *file_ace = NULL;
3197 canon_ace *dir_ace = NULL;
3198 struct security_ace *nt_ace_list = NULL;
3199 size_t num_profile_acls = 0;
3200 struct dom_sid orig_owner_sid;
3201 struct security_descriptor *psd = NULL;
3202 int i;
3203
3204 /*
3205 * Get the owner, group and world SIDs.
3206 */
3207
3208 create_file_sids(sbuf, &owner_sid, &group_sid);
3209
3210 if (lp_profile_acls(SNUM(conn))) {
3211 /* For WXP SP1 the owner must be administrators. */
3212 sid_copy(&orig_owner_sid, &owner_sid);
3213 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3214 sid_copy(&group_sid, &global_sid_Builtin_Users);
3215 num_profile_acls = 3;
3216 }
3217
3218 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3219
3220 /*
3221 * In the optimum case Creator Owner and Creator Group would be used for
3222 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3223 * would lead to usability problems under Windows: The Creator entries
3224 * are only available in browse lists of directories and not for files;
3225 * additionally the identity of the owning group couldn't be determined.
3226 * We therefore use those identities only for Default ACLs.
3227 */
3228
3229 /* Create the canon_ace lists. */
3230 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3231 &owner_sid, &group_sid, pal,
3232 SMB_ACL_TYPE_ACCESS);
3233
3234 /* We must have *some* ACLS. */
3235
3236 if (count_canon_ace_list(file_ace) == 0) {
3237 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3238 goto done;
3239 }
3240
3241 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3242 dir_ace = canonicalise_acl(conn, name, def_acl,
3243 sbuf,
3244 &global_sid_Creator_Owner,
3245 &global_sid_Creator_Group,
3246 pal, SMB_ACL_TYPE_DEFAULT);
3247 }
3248
3249 /*
3250 * Create the NT ACE list from the canonical ace lists.
3251 */
3252
3253 {
3254 canon_ace *ace;
3255 enum security_ace_type nt_acl_type;
3256
3257 if (nt4_compatible_acls() && dir_ace) {
3258 /*
3259 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3260 * but no non-INHERIT_ONLY entry for one SID. So we only
3261 * remove entries from the Access ACL if the
3262 * corresponding Default ACL entries have also been
3263 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3264 * are exceptions. We can do nothing
3265 * intelligent if the Default ACL contains entries that
3266 * are not also contained in the Access ACL, so this
3267 * case will still fail under NT 4.
3268 */
3269
3270 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3271 if (ace && !ace->perms) {
3272 DLIST_REMOVE(dir_ace, ace);
3273 SAFE_FREE(ace);
3274
3275 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3276 if (ace && !ace->perms) {
3277 DLIST_REMOVE(file_ace, ace);
3278 SAFE_FREE(ace);
3279 }
3280 }
3281
3282 /*
3283 * WinNT doesn't usually have Creator Group
3284 * in browse lists, so we send this entry to
3285 * WinNT even if it contains no relevant
3286 * permissions. Once we can add
3287 * Creator Group to browse lists we can
3288 * re-enable this.
3289 */
3290
3291 #if 0
3292 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3293 if (ace && !ace->perms) {
3294 DLIST_REMOVE(dir_ace, ace);
3295 SAFE_FREE(ace);
3296 }
3297 #endif
3298
3299 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3300 if (ace && !ace->perms) {
3301 DLIST_REMOVE(file_ace, ace);
3302 SAFE_FREE(ace);
3303 }
3304 }
3305
3306 num_acls = count_canon_ace_list(file_ace);
3307 num_def_acls = count_canon_ace_list(dir_ace);
3308
3309 /* Allocate the ace list. */
3310 if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3311 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3312 goto done;
3313 }
3314
3315 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3316
3317 /*
3318 * Create the NT ACE list from the canonical ace lists.
3319 */
3320
3321 for (ace = file_ace; ace != NULL; ace = ace->next) {
3322 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3323 &nt_acl_type,
3324 ace->perms,
3325 S_ISDIR(sbuf->st_ex_mode));
3326 init_sec_ace(&nt_ace_list[num_aces++],
3327 &ace->trustee,
3328 nt_acl_type,
3329 acc,
3330 ace->ace_flags);
3331 }
3332
3333 /* The User must have access to a profile share - even
3334 * if we can't map the SID. */
3335 if (lp_profile_acls(SNUM(conn))) {
3336 add_or_replace_ace(nt_ace_list, &num_aces,
3337 &global_sid_Builtin_Users,
3338 SEC_ACE_TYPE_ACCESS_ALLOWED,
3339 FILE_GENERIC_ALL, 0);
3340 }
3341
3342 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3343 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3344 &nt_acl_type,
3345 ace->perms,
3346 S_ISDIR(sbuf->st_ex_mode));
3347 init_sec_ace(&nt_ace_list[num_aces++],
3348 &ace->trustee,
3349 nt_acl_type,
3350 acc,
3351 ace->ace_flags |
3352 SEC_ACE_FLAG_OBJECT_INHERIT|
3353 SEC_ACE_FLAG_CONTAINER_INHERIT|
3354 SEC_ACE_FLAG_INHERIT_ONLY);
3355 }
3356
3357 /* The User must have access to a profile share - even
3358 * if we can't map the SID. */
3359 if (lp_profile_acls(SNUM(conn))) {
3360 add_or_replace_ace(nt_ace_list, &num_aces,
3361 &global_sid_Builtin_Users,
3362 SEC_ACE_TYPE_ACCESS_ALLOWED,
3363 FILE_GENERIC_ALL,
3364 SEC_ACE_FLAG_OBJECT_INHERIT |
3365 SEC_ACE_FLAG_CONTAINER_INHERIT |
3366 SEC_ACE_FLAG_INHERIT_ONLY);
3367 }
3368
3369 /*
3370 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3371 * Win2K needs this to get the inheritance correct when replacing ACLs
3372 * on a directory tree. Based on work by Jim @ IBM.
3373 */
3374
3375 num_aces = merge_default_aces(nt_ace_list, num_aces);
3376
3377 if (lp_profile_acls(SNUM(conn))) {
3378 for (i = 0; i < num_aces; i++) {
3379 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3380 add_or_replace_ace(nt_ace_list, &num_aces,
3381 &orig_owner_sid,
3382 nt_ace_list[i].type,
3383 nt_ace_list[i].access_mask,
3384 nt_ace_list[i].flags);
3385 break;
3386 }
3387 }
3388 }
3389 }
3390
3391 if (num_aces) {
3392 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3393 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3394 goto done;
3395 }
3396 }
3397 } /* security_info & SECINFO_DACL */
3398
3399 psd = make_standard_sec_desc( talloc_tos(),
3400 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3401 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3402 psa,
3403 &sd_size);
3404
3405 if(!psd) {
3406 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3407 sd_size = 0;
3408 goto done;
3409 }
3410
3411 /*
3412 * Windows 2000: The DACL_PROTECTED flag in the security
3413 * descriptor marks the ACL as non-inheriting, i.e., no
3414 * ACEs from higher level directories propagate to this
3415 * ACL. In the POSIX ACL model permissions are only
3416 * inherited at file create time, so ACLs never contain
3417 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3418 * flag doesn't seem to bother Windows NT.
3419 * Always set this if map acl inherit is turned off.
3420 */
3421 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3422 psd->type |= SEC_DESC_DACL_PROTECTED;
3423 } else {
3424 psd->type |= pal->sd_type;
3425 }
3426
3427 if (psd->dacl) {
3428 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3429 }
3430
3431 *ppdesc = psd;
3432
3433 done:
3434
3435 if (posix_acl) {
3436 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3437 }
3438 if (def_acl) {
3439 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3440 }
3441 free_canon_ace_list(file_ace);
3442 free_canon_ace_list(dir_ace);
3443 free_inherited_info(pal);
3444 SAFE_FREE(nt_ace_list);
3445
3446 return NT_STATUS_OK;
3447 }
3448
3449 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3450 struct security_descriptor **ppdesc)
3451 {
3452 SMB_STRUCT_STAT sbuf;
3453 SMB_ACL_T posix_acl = NULL;
3454 struct pai_val *pal;
3455
3456 *ppdesc = NULL;
3457
3458 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3459 fsp_str_dbg(fsp)));
3460
3461 /* can it happen that fsp_name == NULL ? */
3462 if (fsp->is_directory || fsp->fh->fd == -1) {
3463 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3464 security_info, ppdesc);
3465 }
3466
3467 /* Get the stat struct for the owner info. */
3468 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3469 return map_nt_error_from_unix(errno);
3470 }
3471
3472 /* Get the ACL from the fd. */
3473 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3474
3475 pal = fload_inherited_info(fsp);
3476
3477 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3478 &sbuf, pal, posix_acl, NULL,
3479 security_info, ppdesc);
3480 }
3481
3482 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3483 uint32_t security_info, struct security_descriptor **ppdesc)
3484 {
3485 SMB_ACL_T posix_acl = NULL;
3486 SMB_ACL_T def_acl = NULL;
3487 struct pai_val *pal;
3488 struct smb_filename smb_fname;
3489 int ret;
3490
3491 *ppdesc = NULL;
3492
3493 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3494
3495 ZERO_STRUCT(smb_fname);
3496 smb_fname.base_name = discard_const_p(char, name);
3497
3498 /* Get the stat struct for the owner info. */
3499 if (lp_posix_pathnames()) {
3500 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3501 } else {
3502 ret = SMB_VFS_STAT(conn, &smb_fname);
3503 }
3504
3505 if (ret == -1) {
3506 return map_nt_error_from_unix(errno);
3507 }
3508
3509 /* Get the ACL from the path. */
3510 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3511
3512 /* If it's a directory get the default POSIX ACL. */
3513 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3514 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3515 def_acl = free_empty_sys_acl(conn, def_acl);
3516 }
3517
3518 pal = load_inherited_info(conn, name);
3519
3520 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3521 posix_acl, def_acl, security_info,
3522 ppdesc);
3523 }
3524
3525 /****************************************************************************
3526 Try to chown a file. We will be able to chown it under the following conditions.
3527
3528 1) If we have root privileges, then it will just work.
3529 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3530 3) If we have SeRestorePrivilege we can change the user to any other user.
3531 4) If we have write permission to the file and dos_filemodes is set
3532 then allow chown to the currently authenticated user.
3533 ****************************************************************************/
3534
3535 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3536 uid_t uid, gid_t gid)
3537 {
3538 int ret;
3539 files_struct *fsp;
3540
3541 if(!CAN_WRITE(conn)) {
3542 return -1;
3543 }
3544
3545 /* Case (1). */
3546 /* try the direct way first */
3547 if (lp_posix_pathnames()) {
3548 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3549 } else {
3550 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3551 }
3552
3553 if (ret == 0)
3554 return 0;
3555
3556 /* Case (2) / (3) */
3557 if (lp_enable_privileges()) {
3558
3559 bool has_take_ownership_priv = security_token_has_privilege(get_current_nttok(conn), SEC_PRIV_TAKE_OWNERSHIP);
3560 bool has_restore_priv = security_token_has_privilege(get_current_nttok(conn), SEC_PRIV_RESTORE);
3561
3562 /* Case (2) */
3563 if ( ( has_take_ownership_priv && ( uid == get_current_uid(conn) ) ) ||
3564 /* Case (3) */
3565 ( has_restore_priv ) ) {
3566
3567 become_root();
3568 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3569 if (lp_posix_pathnames()) {
3570 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3571 (gid_t)-1);
3572 } else {
3573 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3574 (gid_t)-1);
3575 }
3576 unbecome_root();
3577 return ret;
3578 }
3579 }
3580
3581 /* Case (4). */
3582 if (!lp_dos_filemode(SNUM(conn))) {
3583 errno = EPERM;
3584 return -1;
3585 }
3586
3587 /* only allow chown to the current user. This is more secure,
3588 and also copes with the case where the SID in a take ownership ACL is
3589 a local SID on the users workstation
3590 */
3591 if (uid != get_current_uid(conn)) {
3592 errno = EPERM;
3593 return -1;
3594 }
3595
3596 if (lp_posix_pathnames()) {
3597 ret = SMB_VFS_LSTAT(conn, smb_fname);
3598 } else {
3599 ret = SMB_VFS_STAT(conn, smb_fname);
3600 }
3601
3602 if (ret == -1) {
3603 return -1;
3604 }
3605
3606 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3607 return -1;
3608 }
3609
3610 become_root();
3611 /* Keep the current file gid the same. */
3612 if (fsp->fh->fd == -1) {
3613 if (lp_posix_pathnames()) {
3614 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3615 (gid_t)-1);
3616 } else {
3617 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3618 (gid_t)-1);
3619 }
3620 } else {
3621 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3622 }
3623 unbecome_root();
3624
3625 close_file(NULL, fsp, NORMAL_CLOSE);
3626
3627 return ret;
3628 }
3629
3630 #if 0
3631 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3632
3633 /****************************************************************************
3634 Take care of parent ACL inheritance.
3635 ****************************************************************************/
3636
3637 NTSTATUS append_parent_acl(files_struct *fsp,
3638 const struct security_descriptor *pcsd,
3639 struct security_descriptor **pp_new_sd)
3640 {
3641 struct smb_filename *smb_dname = NULL;
3642 struct security_descriptor *parent_sd = NULL;
3643 files_struct *parent_fsp = NULL;
3644 TALLOC_CTX *mem_ctx = talloc_tos();
3645 char *parent_name = NULL;
3646 struct security_ace *new_ace = NULL;
3647 unsigned int num_aces = pcsd->dacl->num_aces;
3648 NTSTATUS status;
3649 int info;
3650 unsigned int i, j;
3651 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3652 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3653
3654 if (psd == NULL) {
3655 return NT_STATUS_NO_MEMORY;
3656 }
3657
3658 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3659 NULL)) {
3660 return NT_STATUS_NO_MEMORY;
3661 }
3662
3663 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3664 &smb_dname);
3665 if (!NT_STATUS_IS_OK(status)) {
3666 goto fail;
3667 }
3668
3669 status = SMB_VFS_CREATE_FILE(
3670 fsp->conn, /* conn */
3671 NULL, /* req */
3672 0, /* root_dir_fid */
3673 smb_dname, /* fname */
3674 FILE_READ_ATTRIBUTES, /* access_mask */
3675 FILE_SHARE_NONE, /* share_access */
3676 FILE_OPEN, /* create_disposition*/
3677 FILE_DIRECTORY_FILE, /* create_options */
3678 0, /* file_attributes */
3679 INTERNAL_OPEN_ONLY, /* oplock_request */
3680 0, /* allocation_size */
3681 NULL, /* sd */
3682 NULL, /* ea_list */
3683 &parent_fsp, /* result */
3684 &info); /* pinfo */
3685
3686 if (!NT_STATUS_IS_OK(status)) {
3687 TALLOC_FREE(smb_dname);
3688 return status;
3689 }
3690
3691 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3692 SECINFO_DACL, &parent_sd );
3693
3694 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3695 TALLOC_FREE(smb_dname);
3696
3697 if (!NT_STATUS_IS_OK(status)) {
3698 return status;
3699 }
3700
3701 /*
3702 * Make room for potentially all the ACLs from
3703 * the parent. We used to add the ugw triple here,
3704 * as we knew we were dealing with POSIX ACLs.
3705 * We no longer need to do so as we can guarentee
3706 * that a default ACL from the parent directory will
3707 * be well formed for POSIX ACLs if it came from a
3708 * POSIX ACL source, and if we're not writing to a
3709 * POSIX ACL sink then we don't care if it's not well
3710 * formed. JRA.
3711 */
3712
3713 num_aces += parent_sd->dacl->num_aces;
3714
3715 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3716 num_aces)) == NULL) {
3717 return NT_STATUS_NO_MEMORY;
3718 }
3719
3720 /* Start by copying in all the given ACE entries. */
3721 for (i = 0; i < psd->dacl->num_aces; i++) {
3722 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3723 }
3724
3725 /*
3726 * Note that we're ignoring "inherit permissions" here
3727 * as that really only applies to newly created files. JRA.
3728 */
3729
3730 /* Finally append any inherited ACEs. */
3731 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3732 struct security_ace *se = &parent_sd->dacl->aces[j];
3733
3734 if (fsp->is_directory) {
3735 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3736 /* Doesn't apply to a directory - ignore. */
3737 DEBUG(10,("append_parent_acl: directory %s "
3738 "ignoring non container "
3739 "inherit flags %u on ACE with sid %s "
3740 "from parent %s\n",
3741 fsp_str_dbg(fsp),
3742 (unsigned int)se->flags,
3743 sid_string_dbg(&se->trustee),
3744 parent_name));
3745 continue;
3746 }
3747 } else {
3748 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3749 /* Doesn't apply to a file - ignore. */
3750 DEBUG(10,("append_parent_acl: file %s "
3751 "ignoring non object "
3752 "inherit flags %u on ACE with sid %s "
3753 "from parent %s\n",
3754 fsp_str_dbg(fsp),
3755 (unsigned int)se->flags,
3756 sid_string_dbg(&se->trustee),
3757 parent_name));
3758 continue;
3759 }
3760 }
3761
3762 if (is_dacl_protected) {
3763 /* If the DACL is protected it means we must
3764 * not overwrite an existing ACE entry with the
3765 * same SID. This is order N^2. Ouch :-(. JRA. */
3766 unsigned int k;
3767 for (k = 0; k < psd->dacl->num_aces; k++) {
3768 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3769 &se->trustee)) {
3770 break;
3771 }
3772 }
3773 if (k < psd->dacl->num_aces) {
3774 /* SID matched. Ignore. */
3775 DEBUG(10,("append_parent_acl: path %s "
3776 "ignoring ACE with protected sid %s "
3777 "from parent %s\n",
3778 fsp_str_dbg(fsp),
3779 sid_string_dbg(&se->trustee),
3780 parent_name));
3781 continue;
3782 }
3783 }
3784
3785 sec_ace_copy(&new_ace[i], se);
3786 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3787 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3788 }
3789 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3790
3791 if (fsp->is_directory) {
3792 /*
3793 * Strip off any inherit only. It's applied.
3794 */
3795 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3796 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3797 /* No further inheritance. */
3798 new_ace[i].flags &=
3799 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3800 SEC_ACE_FLAG_OBJECT_INHERIT);
3801 }
3802 } else {
3803 /*
3804 * Strip off any container or inherit
3805 * flags, they can't apply to objects.
3806 */
3807 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3808 SEC_ACE_FLAG_INHERIT_ONLY|
3809 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3810 }
3811 i++;
3812
3813 DEBUG(10,("append_parent_acl: path %s "
3814 "inheriting ACE with sid %s "
3815 "from parent %s\n",
3816 fsp_str_dbg(fsp),
3817 sid_string_dbg(&se->trustee),
3818 parent_name));
3819 }
3820
3821 psd->dacl->aces = new_ace;
3822 psd->dacl->num_aces = i;
3823 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3824 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3825
3826 *pp_new_sd = psd;
3827 return status;
3828 }
3829 #endif
3830
3831 /****************************************************************************
3832 Reply to set a security descriptor on an fsp. security_info_sent is the
3833 description of the following NT ACL.
3834 This should be the only external function needed for the UNIX style set ACL.
3835 We make a copy of psd_orig as internal functions modify the elements inside
3836 it, even though it's a const pointer.
3837 ****************************************************************************/
3838
3839 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3840 {
3841 connection_struct *conn = fsp->conn;
3842 uid_t user = (uid_t)-1;
3843 gid_t grp = (gid_t)-1;
3844 struct dom_sid file_owner_sid;
3845 struct dom_sid file_grp_sid;
3846 canon_ace *file_ace_list = NULL;
3847 canon_ace *dir_ace_list = NULL;
3848 bool acl_perms = False;
3849 mode_t orig_mode = (mode_t)0;
3850 NTSTATUS status;
3851 bool set_acl_as_root = false;
3852 bool acl_set_support = false;
3853 bool ret = false;
3854 struct security_descriptor *psd = NULL;
3855
3856 DEBUG(10,("set_nt_acl: called for file %s\n",
3857 fsp_str_dbg(fsp)));
3858
3859 if (!CAN_WRITE(conn)) {
3860 DEBUG(10,("set acl rejected on read-only share\n"));
3861 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3862 }
3863
3864 if (!psd_orig) {
3865 return NT_STATUS_INVALID_PARAMETER;
3866 }
3867
3868 psd = dup_sec_desc(talloc_tos(), psd_orig);
3869 if (!psd) {
3870 return NT_STATUS_NO_MEMORY;
3871 }
3872
3873 /*
3874 * Get the current state of the file.
3875 */
3876
3877 status = vfs_stat_fsp(fsp);
3878 if (!NT_STATUS_IS_OK(status)) {
3879 return status;
3880 }
3881
3882 /* Save the original element we check against. */
3883 orig_mode = fsp->fsp_name->st.st_ex_mode;
3884
3885 /*
3886 * Unpack the user/group/world id's.
3887 */
3888
3889 /* POSIX can't cope with missing owner/group. */
3890 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3891 security_info_sent &= ~SECINFO_OWNER;
3892 }
3893 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3894 security_info_sent &= ~SECINFO_GROUP;
3895 }
3896
3897 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3898 if (!NT_STATUS_IS_OK(status)) {
3899 return status;
3900 }
3901
3902 /*
3903 * Do we need to chown ? If so this must be done first as the incoming
3904 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3905 * Noticed by Simo.
3906 */
3907
3908 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3909 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3910
3911 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3912 fsp_str_dbg(fsp), (unsigned int)user,
3913 (unsigned int)grp));
3914
3915 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3916 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3917 "= %s.\n", fsp_str_dbg(fsp),
3918 (unsigned int)user, (unsigned int)grp,
3919 strerror(errno)));
3920 if (errno == EPERM) {
3921 return NT_STATUS_INVALID_OWNER;
3922 }
3923 return map_nt_error_from_unix(errno);
3924 }
3925
3926 /*
3927 * Recheck the current state of the file, which may have changed.
3928 * (suid/sgid bits, for instance)
3929 */
3930
3931 status = vfs_stat_fsp(fsp);
3932 if (!NT_STATUS_IS_OK(status)) {
3933 return status;
3934 }
3935
3936 /* Save the original element we check against. */
3937 orig_mode = fsp->fsp_name->st.st_ex_mode;
3938
3939 /* If we successfully chowned, we know we must
3940 * be able to set the acl, so do it as root.
3941 */
3942 set_acl_as_root = true;
3943 }
3944
3945 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3946
3947 if((security_info_sent & SECINFO_DACL) &&
3948 (psd->type & SEC_DESC_DACL_PRESENT) &&
3949 (psd->dacl == NULL)) {
3950 struct security_ace ace[3];
3951
3952 /* We can't have NULL DACL in POSIX.
3953 Use owner/group/Everyone -> full access. */
3954
3955 init_sec_ace(&ace[0],
3956 &file_owner_sid,
3957 SEC_ACE_TYPE_ACCESS_ALLOWED,
3958 GENERIC_ALL_ACCESS,
3959 0);
3960 init_sec_ace(&ace[1],
3961 &file_grp_sid,
3962 SEC_ACE_TYPE_ACCESS_ALLOWED,
3963 GENERIC_ALL_ACCESS,
3964 0);
3965 init_sec_ace(&ace[2],
3966 &global_sid_World,
3967 SEC_ACE_TYPE_ACCESS_ALLOWED,
3968 GENERIC_ALL_ACCESS,
3969 0);
3970 psd->dacl = make_sec_acl(talloc_tos(),
3971 NT4_ACL_REVISION,
3972 3,
3973 ace);
3974 if (psd->dacl == NULL) {
3975 return NT_STATUS_NO_MEMORY;
3976 }
3977 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3978 }
3979
3980 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3981 &file_grp_sid, &file_ace_list,
3982 &dir_ace_list, security_info_sent, psd);
3983
3984 /* Ignore W2K traverse DACL set. */
3985 if (!file_ace_list && !dir_ace_list) {
3986 return NT_STATUS_OK;
3987 }
3988
3989 if (!acl_perms) {
3990 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3991 free_canon_ace_list(file_ace_list);
3992 free_canon_ace_list(dir_ace_list);
3993 return NT_STATUS_ACCESS_DENIED;
3994 }
3995
3996 /*
3997 * Only change security if we got a DACL.
3998 */
3999
4000 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4001 free_canon_ace_list(file_ace_list);
4002 free_canon_ace_list(dir_ace_list);
4003 return NT_STATUS_OK;
4004 }
4005
4006 /*
4007 * Try using the POSIX ACL set first. Fall back to chmod if
4008 * we have no ACL support on this filesystem.
4009 */
4010
4011 if (acl_perms && file_ace_list) {
4012 if (set_acl_as_root) {
4013 become_root();
4014 }
4015 ret = set_canon_ace_list(fsp, file_ace_list, false,
4016 &fsp->fsp_name->st, &acl_set_support);
4017 if (set_acl_as_root) {
4018 unbecome_root();
4019 }
4020 if (acl_set_support && ret == false) {
4021 DEBUG(3,("set_nt_acl: failed to set file acl on file "
4022 "%s (%s).\n", fsp_str_dbg(fsp),
4023 strerror(errno)));
4024 free_canon_ace_list(file_ace_list);
4025 free_canon_ace_list(dir_ace_list);
4026 return map_nt_error_from_unix(errno);
4027 }
4028 }
4029
4030 if (acl_perms && acl_set_support && fsp->is_directory) {
4031 if (dir_ace_list) {
4032 if (set_acl_as_root) {
4033 become_root();
4034 }
4035 ret = set_canon_ace_list(fsp, dir_ace_list, true,
4036 &fsp->fsp_name->st,
4037 &acl_set_support);
4038 if (set_acl_as_root) {
4039 unbecome_root();
4040 }
4041 if (ret == false) {
4042 DEBUG(3,("set_nt_acl: failed to set default "
4043 "acl on directory %s (%s).\n",
4044 fsp_str_dbg(fsp), strerror(errno)));
4045 free_canon_ace_list(file_ace_list);
4046 free_canon_ace_list(dir_ace_list);
4047 return map_nt_error_from_unix(errno);
4048 }
4049 } else {
4050 int sret = -1;
4051
4052 /*
4053 * No default ACL - delete one if it exists.
4054 */
4055
4056 if (set_acl_as_root) {
4057 become_root();
4058 }
4059 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4060 fsp->fsp_name->base_name);
4061 if (set_acl_as_root) {
4062 unbecome_root();
4063 }
4064 if (sret == -1) {
4065 if (acl_group_override(conn, fsp->fsp_name)) {
4066 DEBUG(5,("set_nt_acl: acl group "
4067 "control on and current user "
4068 "in file %s primary group. "
4069 "Override delete_def_acl\n",
4070 fsp_str_dbg(fsp)));
4071
4072 become_root();
4073 sret =
4074 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4075 conn,
4076 fsp->fsp_name->base_name);
4077 unbecome_root();
4078 }
4079
4080 if (sret == -1) {
4081 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4082 free_canon_ace_list(file_ace_list);
4083 free_canon_ace_list(dir_ace_list);
4084 return map_nt_error_from_unix(errno);
4085 }
4086 }
4087 }
4088 }
4089
4090 if (acl_set_support) {
4091 if (set_acl_as_root) {
4092 become_root();
4093 }
4094 store_inheritance_attributes(fsp,
4095 file_ace_list,
4096 dir_ace_list,
4097 psd->type);
4098 if (set_acl_as_root) {
4099 unbecome_root();
4100 }
4101 }
4102
4103 /*
4104 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4105 */
4106
4107 if(!acl_set_support && acl_perms) {
4108 mode_t posix_perms;
4109
4110 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4111 free_canon_ace_list(file_ace_list);
4112 free_canon_ace_list(dir_ace_list);
4113 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4114 "posix permissions for file %s.\n",
4115 fsp_str_dbg(fsp)));
4116 return NT_STATUS_ACCESS_DENIED;
4117 }
4118
4119 if (orig_mode != posix_perms) {
4120 int sret = -1;
4121
4122 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4123 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4124
4125 if (set_acl_as_root) {
4126 become_root();
4127 }
4128 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4129 posix_perms);
4130 if (set_acl_as_root) {
4131 unbecome_root();
4132 }
4133 if(sret == -1) {
4134 if (acl_group_override(conn, fsp->fsp_name)) {
4135 DEBUG(5,("set_nt_acl: acl group "
4136 "control on and current user "
4137 "in file %s primary group. "
4138 "Override chmod\n",
4139 fsp_str_dbg(fsp)));
4140
4141 become_root();
4142 sret = SMB_VFS_CHMOD(conn,
4143 fsp->fsp_name->base_name,
4144 posix_perms);
4145 unbecome_root();
4146 }
4147
4148 if (sret == -1) {
4149 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4150 "failed. Error = %s.\n",
4151 fsp_str_dbg(fsp),
4152 (unsigned int)posix_perms,
4153 strerror(errno)));
4154 free_canon_ace_list(file_ace_list);
4155 free_canon_ace_list(dir_ace_list);
4156 return map_nt_error_from_unix(errno);
4157 }
4158 }
4159 }
4160 }
4161
4162 free_canon_ace_list(file_ace_list);
4163 free_canon_ace_list(dir_ace_list);
4164
4165 /* Ensure the stat struct in the fsp is correct. */
4166 status = vfs_stat_fsp(fsp);
4167
4168 return NT_STATUS_OK;
4169 }
4170
4171 /****************************************************************************
4172 Get the actual group bits stored on a file with an ACL. Has no effect if
4173 the file has no ACL. Needed in dosmode code where the stat() will return
4174 the mask bits, not the real group bits, for a file with an ACL.
4175 ****************************************************************************/
4176
4177 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4178 {
4179 int entry_id = SMB_ACL_FIRST_ENTRY;
4180 SMB_ACL_ENTRY_T entry;
4181 SMB_ACL_T posix_acl;
4182 int result = -1;
4183
4184 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4185 if (posix_acl == (SMB_ACL_T)NULL)
4186 return -1;
4187
4188 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4189 SMB_ACL_TAG_T tagtype;
4190 SMB_ACL_PERMSET_T permset;
4191
4192 entry_id = SMB_ACL_NEXT_ENTRY;
4193
4194 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4195 break;
4196
4197 if (tagtype == SMB_ACL_GROUP_OBJ) {
4198 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4199 break;
4200 } else {
4201 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4202 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4203 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4204 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4205 result = 0;
4206 break;
4207 }
4208 }
4209 }
4210 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4211 return result;
4212 }
4213
4214 /****************************************************************************
4215 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4216 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4217 ****************************************************************************/
4218
4219 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4220 {
4221 int entry_id = SMB_ACL_FIRST_ENTRY;
4222 SMB_ACL_ENTRY_T entry;
4223 int num_entries = 0;
4224
4225 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4226 SMB_ACL_TAG_T tagtype;
4227 SMB_ACL_PERMSET_T permset;
4228 mode_t perms;
4229
4230 entry_id = SMB_ACL_NEXT_ENTRY;
4231
4232 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4233 return -1;
4234
4235 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4236 return -1;
4237
4238 num_entries++;
4239
4240 switch(tagtype) {
4241 case SMB_ACL_USER_OBJ:
4242 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4243 break;
4244 case SMB_ACL_GROUP_OBJ:
4245 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4246 break;
4247 case SMB_ACL_MASK:
4248 /*
4249 * FIXME: The ACL_MASK entry permissions should really be set to
4250 * the union of the permissions of all ACL_USER,
4251 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4252 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4253 */
4254 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4255 break;
4256 case SMB_ACL_OTHER:
4257 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4258 break;
4259 default:
4260 continue;
4261 }
4262
4263 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4264 return -1;
4265
4266 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4267 return -1;
4268 }
4269
4270 /*
4271 * If this is a simple 3 element ACL or no elements then it's a standard
4272 * UNIX permission set. Just use chmod...
4273 */
4274
4275 if ((num_entries == 3) || (num_entries == 0))
4276 return -1;
4277
4278 return 0;
4279 }
4280
4281 /****************************************************************************
4282 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4283 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4284 resulting ACL on TO. Note that name is in UNIX character set.
4285 ****************************************************************************/
4286
4287 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4288 {
4289 SMB_ACL_T posix_acl = NULL;
4290 int ret = -1;
4291
4292 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4293 return -1;
4294
4295 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4296 goto done;
4297
4298 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4299
4300 done:
4301
4302 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4303 return ret;
4304 }
4305
4306 /****************************************************************************
4307 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4308 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4309 Note that name is in UNIX character set.
4310 ****************************************************************************/
4311
4312 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4313 {
4314 return copy_access_posix_acl(conn, name, name, mode);
4315 }
4316
4317 /****************************************************************************
4318 Check for an existing default POSIX ACL on a directory.
4319 ****************************************************************************/
4320
4321 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4322 {
4323 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4324 bool has_acl = False;
4325 SMB_ACL_ENTRY_T entry;
4326
4327 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4328 has_acl = True;
4329 }
4330
4331 if (def_acl) {
4332 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4333 }
4334 return has_acl;
4335 }
4336
4337 /****************************************************************************
4338 If the parent directory has no default ACL but it does have an Access ACL,
4339 inherit this Access ACL to file name.
4340 ****************************************************************************/
4341
4342 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4343 const char *name, mode_t mode)
4344 {
4345 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4346 return 0;
4347
4348 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4349 }
4350
4351 /****************************************************************************
4352 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4353 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4354 ****************************************************************************/
4355
4356 int fchmod_acl(files_struct *fsp, mode_t mode)
4357 {
4358 connection_struct *conn = fsp->conn;
4359 SMB_ACL_T posix_acl = NULL;
4360 int ret = -1;
4361
4362 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4363 return -1;
4364
4365 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4366 goto done;
4367
4368 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4369
4370 done:
4371
4372 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4373 return ret;
4374 }
4375
4376 /****************************************************************************
4377 Map from wire type to permset.
4378 ****************************************************************************/
4379
4380 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4381 {
4382 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4383 return False;
4384 }
4385
4386 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4387 return False;
4388 }
4389
4390 if (wire_perm & SMB_POSIX_ACL_READ) {
4391 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4392 return False;
4393 }
4394 }
4395 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4396 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4397 return False;
4398 }
4399 }
4400 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4401 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4402 return False;
4403 }
4404 }
4405 return True;
4406 }
4407
4408 /****************************************************************************
4409 Map from wire type to tagtype.
4410 ****************************************************************************/
4411
4412 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4413 {
4414 switch (wire_tt) {
4415 case SMB_POSIX_ACL_USER_OBJ:
4416 *p_tt = SMB_ACL_USER_OBJ;
4417 break;
4418 case SMB_POSIX_ACL_USER:
4419 *p_tt = SMB_ACL_USER;
4420 break;
4421 case SMB_POSIX_ACL_GROUP_OBJ:
4422 *p_tt = SMB_ACL_GROUP_OBJ;
4423 break;
4424 case SMB_POSIX_ACL_GROUP:
4425 *p_tt = SMB_ACL_GROUP;
4426 break;
4427 case SMB_POSIX_ACL_MASK:
4428 *p_tt = SMB_ACL_MASK;
4429 break;
4430 case SMB_POSIX_ACL_OTHER:
4431 *p_tt = SMB_ACL_OTHER;
4432 break;
4433 default:
4434 return False;
4435 }
4436 return True;
4437 }
4438
4439 /****************************************************************************
4440 Create a new POSIX acl from wire permissions.
4441 FIXME ! How does the share mask/mode fit into this.... ?
4442 ****************************************************************************/
4443
4444 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4445 {
4446 unsigned int i;
4447 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4448
4449 if (the_acl == NULL) {
4450 return NULL;
4451 }
4452
4453 for (i = 0; i < num_acls; i++) {
4454 SMB_ACL_ENTRY_T the_entry;
4455 SMB_ACL_PERMSET_T the_permset;
4456 SMB_ACL_TAG_T tag_type;
4457
4458 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4459 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4460 i, strerror(errno) ));
4461 goto fail;
4462 }
4463
4464 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4465 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4466 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4467 goto fail;
4468 }
4469
4470 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4471 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4472 i, strerror(errno) ));
4473 goto fail;
4474 }
4475
4476 /* Get the permset pointer from the new ACL entry. */
4477 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4478 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4479 i, strerror(errno) ));
4480 goto fail;
4481 }
4482
4483 /* Map from wire to permissions. */
4484 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4485 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4486 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4487 goto fail;
4488 }
4489
4490 /* Now apply to the new ACL entry. */
4491 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4492 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4493 i, strerror(errno) ));
4494 goto fail;
4495 }
4496
4497 if (tag_type == SMB_ACL_USER) {
4498 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4499 uid_t uid = (uid_t)uidval;
4500 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4501 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4502 (unsigned int)uid, i, strerror(errno) ));
4503 goto fail;
4504 }
4505 }
4506
4507 if (tag_type == SMB_ACL_GROUP) {
4508 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4509 gid_t gid = (uid_t)gidval;
4510 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4511 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4512 (unsigned int)gid, i, strerror(errno) ));
4513 goto fail;
4514 }
4515 }
4516 }
4517
4518 return the_acl;
4519
4520 fail:
4521
4522 if (the_acl != NULL) {
4523 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4524 }
4525 return NULL;
4526 }
4527
4528 /****************************************************************************
4529 Calls from UNIX extensions - Default POSIX ACL set.
4530 If num_def_acls == 0 and not a directory just return. If it is a directory
4531 and num_def_acls == 0 then remove the default acl. Else set the default acl
4532 on the directory.
4533 ****************************************************************************/
4534
4535 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4536 uint16 num_def_acls, const char *pdata)
4537 {
4538 SMB_ACL_T def_acl = NULL;
4539
4540 if (!S_ISDIR(psbuf->st_ex_mode)) {
4541 if (num_def_acls) {
4542 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4543 errno = EISDIR;
4544 return False;
4545 } else {
4546 return True;
4547 }
4548 }
4549
4550 if (!num_def_acls) {
4551 /* Remove the default ACL. */
4552 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4553 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4554 fname, strerror(errno) ));
4555 return False;
4556 }
4557 return True;
4558 }
4559
4560 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4561 return False;
4562 }
4563
4564 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4565 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4566 fname, strerror(errno) ));
4567 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4568 return False;
4569 }
4570
4571 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4572 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4573 return True;
4574 }
4575
4576 /****************************************************************************
4577 Remove an ACL from a file. As we don't have acl_delete_entry() available
4578 we must read the current acl and copy all entries except MASK, USER and GROUP
4579 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4580 removed.
4581 FIXME ! How does the share mask/mode fit into this.... ?
4582 ****************************************************************************/
4583
4584 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4585 {
4586 SMB_ACL_T file_acl = NULL;
4587 int entry_id = SMB_ACL_FIRST_ENTRY;
4588 SMB_ACL_ENTRY_T entry;
4589 bool ret = False;
4590 /* Create a new ACL with only 3 entries, u/g/w. */
4591 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4592 SMB_ACL_ENTRY_T user_ent = NULL;
4593 SMB_ACL_ENTRY_T group_ent = NULL;
4594 SMB_ACL_ENTRY_T other_ent = NULL;
4595
4596 if (new_file_acl == NULL) {
4597 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4598 return False;
4599 }
4600
4601 /* Now create the u/g/w entries. */
4602 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4603 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4604 fname, strerror(errno) ));
4605 goto done;
4606 }
4607 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4608 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4609 fname, strerror(errno) ));
4610 goto done;
4611 }
4612
4613 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4614 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4615 fname, strerror(errno) ));
4616 goto done;
4617 }
4618 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4619 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4620 fname, strerror(errno) ));
4621 goto done;
4622 }
4623
4624 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4625 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4626 fname, strerror(errno) ));
4627 goto done;
4628 }
4629 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4630 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4631 fname, strerror(errno) ));
4632 goto done;
4633 }
4634
4635 /* Get the current file ACL. */
4636 if (fsp && fsp->fh->fd != -1) {
4637 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4638 } else {
4639 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4640 }
4641
4642 if (file_acl == NULL) {
4643 /* This is only returned if an error occurred. Even for a file with
4644 no acl a u/g/w acl should be returned. */
4645 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4646 fname, strerror(errno) ));
4647 goto done;
4648 }
4649
4650 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4651 SMB_ACL_TAG_T tagtype;
4652 SMB_ACL_PERMSET_T permset;
4653
4654 entry_id = SMB_ACL_NEXT_ENTRY;
4655
4656 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4657 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4658 fname, strerror(errno) ));
4659 goto done;
4660 }
4661
4662 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4663 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4664 fname, strerror(errno) ));
4665 goto done;
4666 }
4667
4668 if (tagtype == SMB_ACL_USER_OBJ) {
4669 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4670 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4671 fname, strerror(errno) ));
4672 }
4673 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4674 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4675 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4676 fname, strerror(errno) ));
4677 }
4678 } else if (tagtype == SMB_ACL_OTHER) {
4679 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4680 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4681 fname, strerror(errno) ));
4682 }
4683 }
4684 }
4685
4686 /* Set the new empty file ACL. */
4687 if (fsp && fsp->fh->fd != -1) {
4688 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4689 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4690 fname, strerror(errno) ));
4691 goto done;
4692 }
4693 } else {
4694 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4695 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4696 fname, strerror(errno) ));
4697 goto done;
4698 }
4699 }
4700
4701 ret = True;
4702
4703 done:
4704
4705 if (file_acl) {
4706 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4707 }
4708 if (new_file_acl) {
4709 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4710 }
4711 return ret;
4712 }
4713
4714 /****************************************************************************
4715 Calls from UNIX extensions - POSIX ACL set.
4716 If num_def_acls == 0 then read/modify/write acl after removing all entries
4717 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4718 ****************************************************************************/
4719
4720 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4721 {
4722 SMB_ACL_T file_acl = NULL;
4723
4724 if (!num_acls) {
4725 /* Remove the ACL from the file. */
4726 return remove_posix_acl(conn, fsp, fname);
4727 }
4728
4729 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4730 return False;
4731 }
4732
4733 if (fsp && fsp->fh->fd != -1) {
4734 /* The preferred way - use an open fd. */
4735 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4736 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4737 fname, strerror(errno) ));
4738 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4739 return False;
4740 }
4741 } else {
4742 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4743 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4744 fname, strerror(errno) ));
4745 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4746 return False;
4747 }
4748 }
4749
4750 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4751 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4752 return True;
4753 }
4754
4755 /********************************************************************
4756 Pull the NT ACL from a file on disk or the OpenEventlog() access
4757 check. Caller is responsible for freeing the returned security
4758 descriptor via TALLOC_FREE(). This is designed for dealing with
4759 user space access checks in smbd outside of the VFS. For example,
4760 checking access rights in OpenEventlog().
4761
4762 Assume we are dealing with files (for now)
4763 ********************************************************************/
4764
4765 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4766 {
4767 struct security_descriptor *psd, *ret_sd;
4768 connection_struct *conn;
4769 files_struct finfo;
4770 struct fd_handle fh;
4771 NTSTATUS status;
4772
4773 conn = TALLOC_ZERO_P(ctx, connection_struct);
4774 if (conn == NULL) {
4775 DEBUG(0, ("talloc failed\n"));
4776 return NULL;
4777 }
4778
4779 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4780 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4781 TALLOC_FREE(conn);
4782 return NULL;
4783 }
4784
4785 conn->params->service = -1;
4786
4787 set_conn_connectpath(conn, "/");
4788
4789 if (!smbd_vfs_init(conn)) {
4790 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4791 conn_free(conn);
4792 return NULL;
4793 }
4794
4795 ZERO_STRUCT( finfo );
4796 ZERO_STRUCT( fh );
4797
4798 finfo.fnum = -1;
4799 finfo.conn = conn;
4800 finfo.fh = &fh;
4801 finfo.fh->fd = -1;
4802
4803 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4804 &finfo.fsp_name);
4805 if (!NT_STATUS_IS_OK(status)) {
4806 conn_free(conn);
4807 return NULL;
4808 }
4809
4810 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4811 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4812 TALLOC_FREE(finfo.fsp_name);
4813 conn_free(conn);
4814 return NULL;
4815 }
4816
4817 ret_sd = dup_sec_desc( ctx, psd );
4818
4819 TALLOC_FREE(finfo.fsp_name);
4820 conn_free(conn);
4821
4822 return ret_sd;
4823 }
4824
4825 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4826
4827 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4828 const char *name,
4829 SMB_STRUCT_STAT *psbuf,
4830 struct security_descriptor **ppdesc)
4831 {
4832 struct dom_sid owner_sid, group_sid;
4833 size_t size = 0;
4834 struct security_ace aces[4];
4835 uint32_t access_mask = 0;
4836 mode_t mode = psbuf->st_ex_mode;
4837 struct security_acl *new_dacl = NULL;
4838 int idx = 0;
4839
4840 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4841 name, (int)mode ));
4842
4843 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4844 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4845
4846 /*
4847 We provide up to 4 ACEs
4848 - Owner
4849 - Group
4850 - Everyone
4851 - NT System
4852 */
4853
4854 if (mode & S_IRUSR) {
4855 if (mode & S_IWUSR) {
4856 access_mask |= SEC_RIGHTS_FILE_ALL;
4857 } else {
4858 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4859 }
4860 }
4861 if (mode & S_IWUSR) {
4862 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4863 }
4864
4865 init_sec_ace(&aces[idx],
4866 &owner_sid,
4867 SEC_ACE_TYPE_ACCESS_ALLOWED,
4868 access_mask,
4869 0);
4870 idx++;
4871
4872 access_mask = 0;
4873 if (mode & S_IRGRP) {
4874 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4875 }
4876 if (mode & S_IWGRP) {
4877 /* note that delete is not granted - this matches posix behaviour */
4878 access_mask |= SEC_RIGHTS_FILE_WRITE;
4879 }
4880 if (access_mask) {
4881 init_sec_ace(&aces[idx],
4882 &group_sid,
4883 SEC_ACE_TYPE_ACCESS_ALLOWED,
4884 access_mask,
4885 0);
4886 idx++;
4887 }
4888
4889 access_mask = 0;
4890 if (mode & S_IROTH) {
4891 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4892 }
4893 if (mode & S_IWOTH) {
4894 access_mask |= SEC_RIGHTS_FILE_WRITE;
4895 }
4896 if (access_mask) {
4897 init_sec_ace(&aces[idx],
4898 &global_sid_World,
4899 SEC_ACE_TYPE_ACCESS_ALLOWED,
4900 access_mask,
4901 0);
4902 idx++;
4903 }
4904
4905 init_sec_ace(&aces[idx],
4906 &global_sid_System,
4907 SEC_ACE_TYPE_ACCESS_ALLOWED,
4908 SEC_RIGHTS_FILE_ALL,
4909 0);
4910 idx++;
4911
4912 new_dacl = make_sec_acl(ctx,
4913 NT4_ACL_REVISION,
4914 idx,
4915 aces);
4916
4917 if (!new_dacl) {
4918 return NT_STATUS_NO_MEMORY;
4919 }
4920
4921 *ppdesc = make_sec_desc(ctx,
4922 SECURITY_DESCRIPTOR_REVISION_1,
4923 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4924 &owner_sid,
4925 &group_sid,
4926 NULL,
4927 new_dacl,
4928 &size);
4929 if (!*ppdesc) {
4930 return NT_STATUS_NO_MEMORY;
4931 }
4932 return NT_STATUS_OK;
4933 }
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