?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
s4-smbtorture: remove another incarnation of test_ClosePrinter.
[Samba.git] / source3 / smbd / posix_acls.c
blob2f2c90161cfdf9db072b59a27fe1904fbe685573
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 extern const struct generic_mapping file_generic_mapping;
25
26 #undef DBGC_CLASS
27 #define DBGC_CLASS DBGC_ACLS
28
29 /****************************************************************************
30 Data structures representing the internal ACE format.
31 ****************************************************************************/
32
33 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
34 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
35
36 typedef union posix_id {
37 uid_t uid;
38 gid_t gid;
39 int world;
40 } posix_id;
41
42 typedef struct canon_ace {
43 struct canon_ace *next, *prev;
44 SMB_ACL_TAG_T type;
45 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
46 struct dom_sid trustee;
47 enum ace_owner owner_type;
48 enum ace_attribute attr;
49 posix_id unix_ug;
50 uint8_t ace_flags; /* From windows ACE entry. */
51 } canon_ace;
52
53 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
54
55 /*
56 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
57 * attribute on disk - version 1.
58 * All values are little endian.
59 *
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 *
65 * Entry format is :
66 *
67 * | 1 | 4 |
68 * +------+-------------------+
69 * | value| uid/gid or world |
70 * | type | value |
71 * +------+-------------------+
72 *
73 * Version 2 format. Stores extra Windows metadata about an ACL.
74 *
75 * | 1 | 2 | 2 | 2 | ....
76 * +------+----------+-------------+---------------------+-------------+--------------------+
77 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
78 * | 2 | type | | | | |
79 * +------+----------+-------------+---------------------+-------------+--------------------+
80 *
81 * Entry format is :
82 *
83 * | 1 | 1 | 4 |
84 * +------+------+-------------------+
85 * | ace | value| uid/gid or world |
86 * | flag | type | value |
87 * +------+-------------------+------+
88 *
89 */
90
91 #define PAI_VERSION_OFFSET 0
92
93 #define PAI_V1_FLAG_OFFSET 1
94 #define PAI_V1_NUM_ENTRIES_OFFSET 2
95 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
96 #define PAI_V1_ENTRIES_BASE 6
97 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
98 #define PAI_V1_ENTRY_LENGTH 5
99
100 #define PAI_V1_VERSION 1
101
102 #define PAI_V2_TYPE_OFFSET 1
103 #define PAI_V2_NUM_ENTRIES_OFFSET 3
104 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
105 #define PAI_V2_ENTRIES_BASE 7
106 #define PAI_V2_ENTRY_LENGTH 6
107
108 #define PAI_V2_VERSION 2
109
110 /*
111 * In memory format of user.SAMBA_PAI attribute.
112 */
113
114 struct pai_entry {
115 struct pai_entry *next, *prev;
116 uint8_t ace_flags;
117 enum ace_owner owner_type;
118 posix_id unix_ug;
119 };
120
121 struct pai_val {
122 uint16_t sd_type;
123 unsigned int num_entries;
124 struct pai_entry *entry_list;
125 unsigned int num_def_entries;
126 struct pai_entry *def_entry_list;
127 };
128
129 /************************************************************************
130 Return a uint32 of the pai_entry principal.
131 ************************************************************************/
132
133 static uint32_t get_pai_entry_val(struct pai_entry *paie)
134 {
135 switch (paie->owner_type) {
136 case UID_ACE:
137 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
138 return (uint32_t)paie->unix_ug.uid;
139 case GID_ACE:
140 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
141 return (uint32_t)paie->unix_ug.gid;
142 case WORLD_ACE:
143 default:
144 DEBUG(10,("get_pai_entry_val: world ace\n"));
145 return (uint32_t)-1;
146 }
147 }
148
149 /************************************************************************
150 Return a uint32 of the entry principal.
151 ************************************************************************/
152
153 static uint32_t get_entry_val(canon_ace *ace_entry)
154 {
155 switch (ace_entry->owner_type) {
156 case UID_ACE:
157 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
158 return (uint32_t)ace_entry->unix_ug.uid;
159 case GID_ACE:
160 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
161 return (uint32_t)ace_entry->unix_ug.gid;
162 case WORLD_ACE:
163 default:
164 DEBUG(10,("get_entry_val: world ace\n"));
165 return (uint32_t)-1;
166 }
167 }
168
169 /************************************************************************
170 Create the on-disk format (always v2 now). Caller must free.
171 ************************************************************************/
172
173 static char *create_pai_buf_v2(canon_ace *file_ace_list,
174 canon_ace *dir_ace_list,
175 uint16_t sd_type,
176 size_t *store_size)
177 {
178 char *pai_buf = NULL;
179 canon_ace *ace_list = NULL;
180 char *entry_offset = NULL;
181 unsigned int num_entries = 0;
182 unsigned int num_def_entries = 0;
183 unsigned int i;
184
185 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
186 num_entries++;
187 }
188
189 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
190 num_def_entries++;
191 }
192
193 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
194
195 *store_size = PAI_V2_ENTRIES_BASE +
196 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
197
198 pai_buf = (char *)SMB_MALLOC(*store_size);
199 if (!pai_buf) {
200 return NULL;
201 }
202
203 /* Set up the header. */
204 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
205 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
206 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
207 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
208 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
209
210 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
211 (unsigned int)sd_type ));
212
213 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
214
215 i = 0;
216 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
217 uint8_t type_val = (uint8_t)ace_list->owner_type;
218 uint32_t entry_val = get_entry_val(ace_list);
219
220 SCVAL(entry_offset,0,ace_list->ace_flags);
221 SCVAL(entry_offset,1,type_val);
222 SIVAL(entry_offset,2,entry_val);
223 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
224 i,
225 (unsigned int)ace_list->ace_flags,
226 (unsigned int)type_val,
227 (unsigned int)entry_val ));
228 i++;
229 entry_offset += PAI_V2_ENTRY_LENGTH;
230 }
231
232 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
233 uint8_t type_val = (uint8_t)ace_list->owner_type;
234 uint32_t entry_val = get_entry_val(ace_list);
235
236 SCVAL(entry_offset,0,ace_list->ace_flags);
237 SCVAL(entry_offset,1,type_val);
238 SIVAL(entry_offset,2,entry_val);
239 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
240 i,
241 (unsigned int)ace_list->ace_flags,
242 (unsigned int)type_val,
243 (unsigned int)entry_val ));
244 i++;
245 entry_offset += PAI_V2_ENTRY_LENGTH;
246 }
247
248 return pai_buf;
249 }
250
251 /************************************************************************
252 Store the user.SAMBA_PAI attribute on disk.
253 ************************************************************************/
254
255 static void store_inheritance_attributes(files_struct *fsp,
256 canon_ace *file_ace_list,
257 canon_ace *dir_ace_list,
258 uint16_t sd_type)
259 {
260 int ret;
261 size_t store_size;
262 char *pai_buf;
263
264 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
265 return;
266 }
267
268 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
269 sd_type, &store_size);
270
271 if (fsp->fh->fd != -1) {
272 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
273 pai_buf, store_size, 0);
274 } else {
275 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
276 SAMBA_POSIX_INHERITANCE_EA_NAME,
277 pai_buf, store_size, 0);
278 }
279
280 SAFE_FREE(pai_buf);
281
282 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
283 (unsigned int)sd_type,
284 fsp_str_dbg(fsp)));
285
286 if (ret == -1 && !no_acl_syscall_error(errno)) {
287 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
288 }
289 }
290
291 /************************************************************************
292 Delete the in memory inheritance info.
293 ************************************************************************/
294
295 static void free_inherited_info(struct pai_val *pal)
296 {
297 if (pal) {
298 struct pai_entry *paie, *paie_next;
299 for (paie = pal->entry_list; paie; paie = paie_next) {
300 paie_next = paie->next;
301 SAFE_FREE(paie);
302 }
303 for (paie = pal->def_entry_list; paie; paie = paie_next) {
304 paie_next = paie->next;
305 SAFE_FREE(paie);
306 }
307 SAFE_FREE(pal);
308 }
309 }
310
311 /************************************************************************
312 Get any stored ACE flags.
313 ************************************************************************/
314
315 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
316 {
317 struct pai_entry *paie;
318
319 if (!pal) {
320 return 0;
321 }
322
323 /* If the entry exists it is inherited. */
324 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
325 if (ace_entry->owner_type == paie->owner_type &&
326 get_entry_val(ace_entry) == get_pai_entry_val(paie))
327 return paie->ace_flags;
328 }
329 return 0;
330 }
331
332 /************************************************************************
333 Ensure an attribute just read is valid - v1.
334 ************************************************************************/
335
336 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
337 {
338 uint16 num_entries;
339 uint16 num_def_entries;
340
341 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
342 /* Corrupted - too small. */
343 return false;
344 }
345
346 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
347 return false;
348 }
349
350 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
351 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
352
353 /* Check the entry lists match. */
354 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
355
356 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
357 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
358 return false;
359 }
360
361 return true;
362 }
363
364 /************************************************************************
365 Ensure an attribute just read is valid - v2.
366 ************************************************************************/
367
368 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
369 {
370 uint16 num_entries;
371 uint16 num_def_entries;
372
373 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
374 /* Corrupted - too small. */
375 return false;
376 }
377
378 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
379 return false;
380 }
381
382 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
383 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
384
385 /* Check the entry lists match. */
386 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
387
388 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
389 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
390 return false;
391 }
392
393 return true;
394 }
395
396 /************************************************************************
397 Decode the owner.
398 ************************************************************************/
399
400 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
401 {
402 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
403 switch( paie->owner_type) {
404 case UID_ACE:
405 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
406 DEBUG(10,("get_pai_owner_type: uid = %u\n",
407 (unsigned int)paie->unix_ug.uid ));
408 break;
409 case GID_ACE:
410 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
411 DEBUG(10,("get_pai_owner_type: gid = %u\n",
412 (unsigned int)paie->unix_ug.gid ));
413 break;
414 case WORLD_ACE:
415 paie->unix_ug.world = -1;
416 DEBUG(10,("get_pai_owner_type: world ace\n"));
417 break;
418 default:
419 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
420 (unsigned int)paie->owner_type ));
421 return false;
422 }
423 return true;
424 }
425
426 /************************************************************************
427 Process v2 entries.
428 ************************************************************************/
429
430 static const char *create_pai_v1_entries(struct pai_val *paiv,
431 const char *entry_offset,
432 bool def_entry)
433 {
434 int i;
435
436 for (i = 0; i < paiv->num_entries; i++) {
437 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
438 if (!paie) {
439 return NULL;
440 }
441
442 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
443 if (!get_pai_owner_type(paie, entry_offset)) {
444 return NULL;
445 }
446
447 if (!def_entry) {
448 DLIST_ADD(paiv->entry_list, paie);
449 } else {
450 DLIST_ADD(paiv->def_entry_list, paie);
451 }
452 entry_offset += PAI_V1_ENTRY_LENGTH;
453 }
454 return entry_offset;
455 }
456
457 /************************************************************************
458 Convert to in-memory format from version 1.
459 ************************************************************************/
460
461 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
462 {
463 const char *entry_offset;
464 struct pai_val *paiv = NULL;
465
466 if (!check_pai_ok_v1(buf, size)) {
467 return NULL;
468 }
469
470 paiv = SMB_MALLOC_P(struct pai_val);
471 if (!paiv) {
472 return NULL;
473 }
474
475 memset(paiv, '\0', sizeof(struct pai_val));
476
477 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
478 SEC_DESC_DACL_PROTECTED : 0;
479
480 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
481 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
482
483 entry_offset = buf + PAI_V1_ENTRIES_BASE;
484
485 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
486 paiv->num_entries, paiv->num_def_entries ));
487
488 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
489 if (entry_offset == NULL) {
490 free_inherited_info(paiv);
491 return NULL;
492 }
493 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
494 if (entry_offset == NULL) {
495 free_inherited_info(paiv);
496 return NULL;
497 }
498
499 return paiv;
500 }
501
502 /************************************************************************
503 Process v2 entries.
504 ************************************************************************/
505
506 static const char *create_pai_v2_entries(struct pai_val *paiv,
507 unsigned int num_entries,
508 const char *entry_offset,
509 bool def_entry)
510 {
511 unsigned int i;
512
513 for (i = 0; i < num_entries; i++) {
514 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
515 if (!paie) {
516 return NULL;
517 }
518
519 paie->ace_flags = CVAL(entry_offset,0);
520
521 if (!get_pai_owner_type(paie, entry_offset+1)) {
522 return NULL;
523 }
524 if (!def_entry) {
525 DLIST_ADD(paiv->entry_list, paie);
526 } else {
527 DLIST_ADD(paiv->def_entry_list, paie);
528 }
529 entry_offset += PAI_V2_ENTRY_LENGTH;
530 }
531 return entry_offset;
532 }
533
534 /************************************************************************
535 Convert to in-memory format from version 2.
536 ************************************************************************/
537
538 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
539 {
540 const char *entry_offset;
541 struct pai_val *paiv = NULL;
542
543 if (!check_pai_ok_v2(buf, size)) {
544 return NULL;
545 }
546
547 paiv = SMB_MALLOC_P(struct pai_val);
548 if (!paiv) {
549 return NULL;
550 }
551
552 memset(paiv, '\0', sizeof(struct pai_val));
553
554 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
555
556 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
557 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
558
559 entry_offset = buf + PAI_V2_ENTRIES_BASE;
560
561 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
562 (unsigned int)paiv->sd_type,
563 paiv->num_entries, paiv->num_def_entries ));
564
565 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
566 entry_offset, false);
567 if (entry_offset == NULL) {
568 free_inherited_info(paiv);
569 return NULL;
570 }
571 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
572 entry_offset, true);
573 if (entry_offset == NULL) {
574 free_inherited_info(paiv);
575 return NULL;
576 }
577
578 return paiv;
579 }
580
581 /************************************************************************
582 Convert to in-memory format - from either version 1 or 2.
583 ************************************************************************/
584
585 static struct pai_val *create_pai_val(const char *buf, size_t size)
586 {
587 if (size < 1) {
588 return NULL;
589 }
590 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
591 return create_pai_val_v1(buf, size);
592 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
593 return create_pai_val_v2(buf, size);
594 } else {
595 return NULL;
596 }
597 }
598
599 /************************************************************************
600 Load the user.SAMBA_PAI attribute.
601 ************************************************************************/
602
603 static struct pai_val *fload_inherited_info(files_struct *fsp)
604 {
605 char *pai_buf;
606 size_t pai_buf_size = 1024;
607 struct pai_val *paiv = NULL;
608 ssize_t ret;
609
610 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
611 return NULL;
612 }
613
614 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
615 return NULL;
616 }
617
618 do {
619 if (fsp->fh->fd != -1) {
620 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
621 pai_buf, pai_buf_size);
622 } else {
623 ret = SMB_VFS_GETXATTR(fsp->conn,
624 fsp->fsp_name->base_name,
625 SAMBA_POSIX_INHERITANCE_EA_NAME,
626 pai_buf, pai_buf_size);
627 }
628
629 if (ret == -1) {
630 if (errno != ERANGE) {
631 break;
632 }
633 /* Buffer too small - enlarge it. */
634 pai_buf_size *= 2;
635 SAFE_FREE(pai_buf);
636 if (pai_buf_size > 1024*1024) {
637 return NULL; /* Limit malloc to 1mb. */
638 }
639 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
640 return NULL;
641 }
642 } while (ret == -1);
643
644 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
645 (unsigned long)ret, fsp_str_dbg(fsp)));
646
647 if (ret == -1) {
648 /* No attribute or not supported. */
649 #if defined(ENOATTR)
650 if (errno != ENOATTR)
651 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
652 #else
653 if (errno != ENOSYS)
654 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
655 #endif
656 SAFE_FREE(pai_buf);
657 return NULL;
658 }
659
660 paiv = create_pai_val(pai_buf, ret);
661
662 if (paiv) {
663 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
664 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
665 }
666
667 SAFE_FREE(pai_buf);
668 return paiv;
669 }
670
671 /************************************************************************
672 Load the user.SAMBA_PAI attribute.
673 ************************************************************************/
674
675 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
676 const char *fname)
677 {
678 char *pai_buf;
679 size_t pai_buf_size = 1024;
680 struct pai_val *paiv = NULL;
681 ssize_t ret;
682
683 if (!lp_map_acl_inherit(SNUM(conn))) {
684 return NULL;
685 }
686
687 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
688 return NULL;
689 }
690
691 do {
692 ret = SMB_VFS_GETXATTR(conn, fname,
693 SAMBA_POSIX_INHERITANCE_EA_NAME,
694 pai_buf, pai_buf_size);
695
696 if (ret == -1) {
697 if (errno != ERANGE) {
698 break;
699 }
700 /* Buffer too small - enlarge it. */
701 pai_buf_size *= 2;
702 SAFE_FREE(pai_buf);
703 if (pai_buf_size > 1024*1024) {
704 return NULL; /* Limit malloc to 1mb. */
705 }
706 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
707 return NULL;
708 }
709 } while (ret == -1);
710
711 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
712
713 if (ret == -1) {
714 /* No attribute or not supported. */
715 #if defined(ENOATTR)
716 if (errno != ENOATTR)
717 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
718 #else
719 if (errno != ENOSYS)
720 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
721 #endif
722 SAFE_FREE(pai_buf);
723 return NULL;
724 }
725
726 paiv = create_pai_val(pai_buf, ret);
727
728 if (paiv) {
729 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
730 (unsigned int)paiv->sd_type,
731 fname));
732 }
733
734 SAFE_FREE(pai_buf);
735 return paiv;
736 }
737
738 /****************************************************************************
739 Functions to manipulate the internal ACE format.
740 ****************************************************************************/
741
742 /****************************************************************************
743 Count a linked list of canonical ACE entries.
744 ****************************************************************************/
745
746 static size_t count_canon_ace_list( canon_ace *l_head )
747 {
748 size_t count = 0;
749 canon_ace *ace;
750
751 for (ace = l_head; ace; ace = ace->next)
752 count++;
753
754 return count;
755 }
756
757 /****************************************************************************
758 Free a linked list of canonical ACE entries.
759 ****************************************************************************/
760
761 static void free_canon_ace_list( canon_ace *l_head )
762 {
763 canon_ace *list, *next;
764
765 for (list = l_head; list; list = next) {
766 next = list->next;
767 DLIST_REMOVE(l_head, list);
768 SAFE_FREE(list);
769 }
770 }
771
772 /****************************************************************************
773 Function to duplicate a canon_ace entry.
774 ****************************************************************************/
775
776 static canon_ace *dup_canon_ace( canon_ace *src_ace)
777 {
778 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
779
780 if (dst_ace == NULL)
781 return NULL;
782
783 *dst_ace = *src_ace;
784 dst_ace->prev = dst_ace->next = NULL;
785 return dst_ace;
786 }
787
788 /****************************************************************************
789 Print out a canon ace.
790 ****************************************************************************/
791
792 static void print_canon_ace(canon_ace *pace, int num)
793 {
794 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
795 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
796 if (pace->owner_type == UID_ACE) {
797 const char *u_name = uidtoname(pace->unix_ug.uid);
798 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
799 } else if (pace->owner_type == GID_ACE) {
800 char *g_name = gidtoname(pace->unix_ug.gid);
801 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
802 } else
803 dbgtext( "other ");
804 switch (pace->type) {
805 case SMB_ACL_USER:
806 dbgtext( "SMB_ACL_USER ");
807 break;
808 case SMB_ACL_USER_OBJ:
809 dbgtext( "SMB_ACL_USER_OBJ ");
810 break;
811 case SMB_ACL_GROUP:
812 dbgtext( "SMB_ACL_GROUP ");
813 break;
814 case SMB_ACL_GROUP_OBJ:
815 dbgtext( "SMB_ACL_GROUP_OBJ ");
816 break;
817 case SMB_ACL_OTHER:
818 dbgtext( "SMB_ACL_OTHER ");
819 break;
820 default:
821 dbgtext( "MASK " );
822 break;
823 }
824
825 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
826 dbgtext( "perms ");
827 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
828 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
829 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
830 }
831
832 /****************************************************************************
833 Print out a canon ace list.
834 ****************************************************************************/
835
836 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
837 {
838 int count = 0;
839
840 if( DEBUGLVL( 10 )) {
841 dbgtext( "print_canon_ace_list: %s\n", name );
842 for (;ace_list; ace_list = ace_list->next, count++)
843 print_canon_ace(ace_list, count );
844 }
845 }
846
847 /****************************************************************************
848 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
849 ****************************************************************************/
850
851 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
852 {
853 mode_t ret = 0;
854
855 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
856 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
857 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
858
859 return ret;
860 }
861
862 /****************************************************************************
863 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
864 ****************************************************************************/
865
866 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
867 {
868 mode_t ret = 0;
869
870 if (mode & r_mask)
871 ret |= S_IRUSR;
872 if (mode & w_mask)
873 ret |= S_IWUSR;
874 if (mode & x_mask)
875 ret |= S_IXUSR;
876
877 return ret;
878 }
879
880 /****************************************************************************
881 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
882 an SMB_ACL_PERMSET_T.
883 ****************************************************************************/
884
885 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
886 {
887 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
888 return -1;
889 if (mode & S_IRUSR) {
890 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
891 return -1;
892 }
893 if (mode & S_IWUSR) {
894 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
895 return -1;
896 }
897 if (mode & S_IXUSR) {
898 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
899 return -1;
900 }
901 return 0;
902 }
903
904 /****************************************************************************
905 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
906 ****************************************************************************/
907
908 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
909 {
910 uid_to_sid( powner_sid, psbuf->st_ex_uid );
911 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
912 }
913
914 /****************************************************************************
915 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
916 delete the second one. If the first is deny, mask the permissions off and delete the allow
917 if the permissions become zero, delete the deny if the permissions are non zero.
918 ****************************************************************************/
919
920 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
921 {
922 canon_ace *l_head = *pp_list_head;
923 canon_ace *curr_ace_outer;
924 canon_ace *curr_ace_outer_next;
925
926 /*
927 * First, merge allow entries with identical SIDs, and deny entries
928 * with identical SIDs.
929 */
930
931 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
932 canon_ace *curr_ace;
933 canon_ace *curr_ace_next;
934
935 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
936
937 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
938 bool can_merge = false;
939
940 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
941
942 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
943 * types are the same. For directory acls we must also
944 * ensure the POSIX ACL types are the same. */
945
946 if (!dir_acl) {
947 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
948 (curr_ace->attr == curr_ace_outer->attr));
949 } else {
950 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
951 (curr_ace->type == curr_ace_outer->type) &&
952 (curr_ace->attr == curr_ace_outer->attr));
953 }
954
955 if (can_merge) {
956 if( DEBUGLVL( 10 )) {
957 dbgtext("merge_aces: Merging ACE's\n");
958 print_canon_ace( curr_ace_outer, 0);
959 print_canon_ace( curr_ace, 0);
960 }
961
962 /* Merge two allow or two deny ACE's. */
963
964 /* Theoretically we shouldn't merge a dir ACE if
965 * one ACE has the CI flag set, and the other
966 * ACE has the OI flag set, but this is rare
967 * enough we can ignore it. */
968
969 curr_ace_outer->perms |= curr_ace->perms;
970 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
971 DLIST_REMOVE(l_head, curr_ace);
972 SAFE_FREE(curr_ace);
973 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
974 }
975 }
976 }
977
978 /*
979 * Now go through and mask off allow permissions with deny permissions.
980 * We can delete either the allow or deny here as we know that each SID
981 * appears only once in the list.
982 */
983
984 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
985 canon_ace *curr_ace;
986 canon_ace *curr_ace_next;
987
988 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
989
990 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
991
992 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
993
994 /*
995 * Subtract ACE's with different entries. Due to the ordering constraints
996 * we've put on the ACL, we know the deny must be the first one.
997 */
998
999 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1000 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1001
1002 if( DEBUGLVL( 10 )) {
1003 dbgtext("merge_aces: Masking ACE's\n");
1004 print_canon_ace( curr_ace_outer, 0);
1005 print_canon_ace( curr_ace, 0);
1006 }
1007
1008 curr_ace->perms &= ~curr_ace_outer->perms;
1009
1010 if (curr_ace->perms == 0) {
1011
1012 /*
1013 * The deny overrides the allow. Remove the allow.
1014 */
1015
1016 DLIST_REMOVE(l_head, curr_ace);
1017 SAFE_FREE(curr_ace);
1018 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1019
1020 } else {
1021
1022 /*
1023 * Even after removing permissions, there
1024 * are still allow permissions - delete the deny.
1025 * It is safe to delete the deny here,
1026 * as we are guarenteed by the deny first
1027 * ordering that all the deny entries for
1028 * this SID have already been merged into one
1029 * before we can get to an allow ace.
1030 */
1031
1032 DLIST_REMOVE(l_head, curr_ace_outer);
1033 SAFE_FREE(curr_ace_outer);
1034 break;
1035 }
1036 }
1037
1038 } /* end for curr_ace */
1039 } /* end for curr_ace_outer */
1040
1041 /* We may have modified the list. */
1042
1043 *pp_list_head = l_head;
1044 }
1045
1046 /****************************************************************************
1047 Check if we need to return NT4.x compatible ACL entries.
1048 ****************************************************************************/
1049
1050 bool nt4_compatible_acls(void)
1051 {
1052 int compat = lp_acl_compatibility();
1053
1054 if (compat == ACL_COMPAT_AUTO) {
1055 enum remote_arch_types ra_type = get_remote_arch();
1056
1057 /* Automatically adapt to client */
1058 return (ra_type <= RA_WINNT);
1059 } else
1060 return (compat == ACL_COMPAT_WINNT);
1061 }
1062
1063
1064 /****************************************************************************
1065 Map canon_ace perms to permission bits NT.
1066 The attr element is not used here - we only process deny entries on set,
1067 not get. Deny entries are implicit on get with ace->perms = 0.
1068 ****************************************************************************/
1069
1070 uint32_t map_canon_ace_perms(int snum,
1071 enum security_ace_type *pacl_type,
1072 mode_t perms,
1073 bool directory_ace)
1074 {
1075 uint32_t nt_mask = 0;
1076
1077 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1078
1079 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1080 if (directory_ace) {
1081 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1082 } else {
1083 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1084 }
1085 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1086 /*
1087 * Windows NT refuses to display ACEs with no permissions in them (but
1088 * they are perfectly legal with Windows 2000). If the ACE has empty
1089 * permissions we cannot use 0, so we use the otherwise unused
1090 * WRITE_OWNER permission, which we ignore when we set an ACL.
1091 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1092 * to be changed in the future.
1093 */
1094
1095 if (nt4_compatible_acls())
1096 nt_mask = UNIX_ACCESS_NONE;
1097 else
1098 nt_mask = 0;
1099 } else {
1100 if (directory_ace) {
1101 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1102 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1103 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1104 } else {
1105 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1106 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1107 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1108 }
1109 }
1110
1111 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1112 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1113 }
1114
1115 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1116 (unsigned int)perms, (unsigned int)nt_mask ));
1117
1118 return nt_mask;
1119 }
1120
1121 /****************************************************************************
1122 Map NT perms to a UNIX mode_t.
1123 ****************************************************************************/
1124
1125 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
1126 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
1127 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1128
1129 static mode_t map_nt_perms( uint32 *mask, int type)
1130 {
1131 mode_t mode = 0;
1132
1133 switch(type) {
1134 case S_IRUSR:
1135 if((*mask) & GENERIC_ALL_ACCESS)
1136 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1137 else {
1138 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1139 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1140 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1141 }
1142 break;
1143 case S_IRGRP:
1144 if((*mask) & GENERIC_ALL_ACCESS)
1145 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1146 else {
1147 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1148 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1149 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1150 }
1151 break;
1152 case S_IROTH:
1153 if((*mask) & GENERIC_ALL_ACCESS)
1154 mode = S_IROTH|S_IWOTH|S_IXOTH;
1155 else {
1156 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1157 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1158 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1159 }
1160 break;
1161 }
1162
1163 return mode;
1164 }
1165
1166 /****************************************************************************
1167 Unpack a struct security_descriptor into a UNIX owner and group.
1168 ****************************************************************************/
1169
1170 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1171 uid_t *puser, gid_t *pgrp,
1172 uint32 security_info_sent, const struct
1173 security_descriptor *psd)
1174 {
1175 struct dom_sid owner_sid;
1176 struct dom_sid grp_sid;
1177
1178 *puser = (uid_t)-1;
1179 *pgrp = (gid_t)-1;
1180
1181 if(security_info_sent == 0) {
1182 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1183 return NT_STATUS_OK;
1184 }
1185
1186 /*
1187 * Validate the owner and group SID's.
1188 */
1189
1190 memset(&owner_sid, '\0', sizeof(owner_sid));
1191 memset(&grp_sid, '\0', sizeof(grp_sid));
1192
1193 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1194
1195 /*
1196 * Don't immediately fail if the owner sid cannot be validated.
1197 * This may be a group chown only set.
1198 */
1199
1200 if (security_info_sent & SECINFO_OWNER) {
1201 sid_copy(&owner_sid, psd->owner_sid);
1202 if (!sid_to_uid(&owner_sid, puser)) {
1203 if (lp_force_unknown_acl_user(SNUM(conn))) {
1204 /* this allows take ownership to work
1205 * reasonably */
1206 *puser = get_current_uid(conn);
1207 } else {
1208 DEBUG(3,("unpack_nt_owners: unable to validate"
1209 " owner sid for %s\n",
1210 sid_string_dbg(&owner_sid)));
1211 return NT_STATUS_INVALID_OWNER;
1212 }
1213 }
1214 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1215 (unsigned int)*puser ));
1216 }
1217
1218 /*
1219 * Don't immediately fail if the group sid cannot be validated.
1220 * This may be an owner chown only set.
1221 */
1222
1223 if (security_info_sent & SECINFO_GROUP) {
1224 sid_copy(&grp_sid, psd->group_sid);
1225 if (!sid_to_gid( &grp_sid, pgrp)) {
1226 if (lp_force_unknown_acl_user(SNUM(conn))) {
1227 /* this allows take group ownership to work
1228 * reasonably */
1229 *pgrp = get_current_gid(conn);
1230 } else {
1231 DEBUG(3,("unpack_nt_owners: unable to validate"
1232 " group sid.\n"));
1233 return NT_STATUS_INVALID_OWNER;
1234 }
1235 }
1236 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1237 (unsigned int)*pgrp));
1238 }
1239
1240 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1241
1242 return NT_STATUS_OK;
1243 }
1244
1245 /****************************************************************************
1246 Ensure the enforced permissions for this share apply.
1247 ****************************************************************************/
1248
1249 static void apply_default_perms(const struct share_params *params,
1250 const bool is_directory, canon_ace *pace,
1251 mode_t type)
1252 {
1253 mode_t and_bits = (mode_t)0;
1254 mode_t or_bits = (mode_t)0;
1255
1256 /* Get the initial bits to apply. */
1257
1258 if (is_directory) {
1259 and_bits = lp_dir_security_mask(params->service);
1260 or_bits = lp_force_dir_security_mode(params->service);
1261 } else {
1262 and_bits = lp_security_mask(params->service);
1263 or_bits = lp_force_security_mode(params->service);
1264 }
1265
1266 /* Now bounce them into the S_USR space. */
1267 switch(type) {
1268 case S_IRUSR:
1269 /* Ensure owner has read access. */
1270 pace->perms |= S_IRUSR;
1271 if (is_directory)
1272 pace->perms |= (S_IWUSR|S_IXUSR);
1273 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1274 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1275 break;
1276 case S_IRGRP:
1277 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1278 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1279 break;
1280 case S_IROTH:
1281 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1282 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1283 break;
1284 }
1285
1286 pace->perms = ((pace->perms & and_bits)|or_bits);
1287 }
1288
1289 /****************************************************************************
1290 Check if a given uid/SID is in a group gid/SID. This is probably very
1291 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1292 ****************************************************************************/
1293
1294 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1295 {
1296 const char *u_name = NULL;
1297
1298 /* "Everyone" always matches every uid. */
1299
1300 if (sid_equal(&group_ace->trustee, &global_sid_World))
1301 return True;
1302
1303 /*
1304 * if it's the current user, we already have the unix token
1305 * and don't need to do the complex user_in_group_sid() call
1306 */
1307 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1308 const UNIX_USER_TOKEN *curr_utok = NULL;
1309 size_t i;
1310
1311 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1312 return True;
1313 }
1314
1315 curr_utok = get_current_utok(conn);
1316 for (i=0; i < curr_utok->ngroups; i++) {
1317 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1318 return True;
1319 }
1320 }
1321 }
1322
1323 /* u_name talloc'ed off tos. */
1324 u_name = uidtoname(uid_ace->unix_ug.uid);
1325 if (!u_name) {
1326 return False;
1327 }
1328
1329 /*
1330 * user_in_group_sid() uses create_token_from_username()
1331 * which creates an artificial NT token given just a username,
1332 * so this is not reliable for users from foreign domains
1333 * exported by winbindd!
1334 */
1335 return user_in_group_sid(u_name, &group_ace->trustee);
1336 }
1337
1338 /****************************************************************************
1339 A well formed POSIX file or default ACL has at least 3 entries, a
1340 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1341 In addition, the owner must always have at least read access.
1342 When using this call on get_acl, the pst struct is valid and contains
1343 the mode of the file. When using this call on set_acl, the pst struct has
1344 been modified to have a mode containing the default for this file or directory
1345 type.
1346 ****************************************************************************/
1347
1348 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1349 const struct share_params *params,
1350 const bool is_directory,
1351 const struct dom_sid *pfile_owner_sid,
1352 const struct dom_sid *pfile_grp_sid,
1353 const SMB_STRUCT_STAT *pst,
1354 bool setting_acl)
1355 {
1356 canon_ace *pace;
1357 bool got_user = False;
1358 bool got_grp = False;
1359 bool got_other = False;
1360 canon_ace *pace_other = NULL;
1361
1362 for (pace = *pp_ace; pace; pace = pace->next) {
1363 if (pace->type == SMB_ACL_USER_OBJ) {
1364
1365 if (setting_acl)
1366 apply_default_perms(params, is_directory, pace, S_IRUSR);
1367 got_user = True;
1368
1369 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1370
1371 /*
1372 * Ensure create mask/force create mode is respected on set.
1373 */
1374
1375 if (setting_acl)
1376 apply_default_perms(params, is_directory, pace, S_IRGRP);
1377 got_grp = True;
1378
1379 } else if (pace->type == SMB_ACL_OTHER) {
1380
1381 /*
1382 * Ensure create mask/force create mode is respected on set.
1383 */
1384
1385 if (setting_acl)
1386 apply_default_perms(params, is_directory, pace, S_IROTH);
1387 got_other = True;
1388 pace_other = pace;
1389 }
1390 }
1391
1392 if (!got_user) {
1393 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1394 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1395 return False;
1396 }
1397
1398 ZERO_STRUCTP(pace);
1399 pace->type = SMB_ACL_USER_OBJ;
1400 pace->owner_type = UID_ACE;
1401 pace->unix_ug.uid = pst->st_ex_uid;
1402 pace->trustee = *pfile_owner_sid;
1403 pace->attr = ALLOW_ACE;
1404
1405 if (setting_acl) {
1406 /* See if the owning user is in any of the other groups in
1407 the ACE. If so, OR in the permissions from that group. */
1408
1409 bool group_matched = False;
1410 canon_ace *pace_iter;
1411
1412 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1413 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1414 if (uid_entry_in_group(conn, pace, pace_iter)) {
1415 pace->perms |= pace_iter->perms;
1416 group_matched = True;
1417 }
1418 }
1419 }
1420
1421 /* If we only got an "everyone" perm, just use that. */
1422 if (!group_matched) {
1423 if (got_other)
1424 pace->perms = pace_other->perms;
1425 else
1426 pace->perms = 0;
1427 }
1428
1429 apply_default_perms(params, is_directory, pace, S_IRUSR);
1430 } else {
1431 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1432 }
1433
1434 DLIST_ADD(*pp_ace, pace);
1435 }
1436
1437 if (!got_grp) {
1438 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1439 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1440 return False;
1441 }
1442
1443 ZERO_STRUCTP(pace);
1444 pace->type = SMB_ACL_GROUP_OBJ;
1445 pace->owner_type = GID_ACE;
1446 pace->unix_ug.uid = pst->st_ex_gid;
1447 pace->trustee = *pfile_grp_sid;
1448 pace->attr = ALLOW_ACE;
1449 if (setting_acl) {
1450 /* If we only got an "everyone" perm, just use that. */
1451 if (got_other)
1452 pace->perms = pace_other->perms;
1453 else
1454 pace->perms = 0;
1455 apply_default_perms(params, is_directory, pace, S_IRGRP);
1456 } else {
1457 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1458 }
1459
1460 DLIST_ADD(*pp_ace, pace);
1461 }
1462
1463 if (!got_other) {
1464 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1465 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1466 return False;
1467 }
1468
1469 ZERO_STRUCTP(pace);
1470 pace->type = SMB_ACL_OTHER;
1471 pace->owner_type = WORLD_ACE;
1472 pace->unix_ug.world = -1;
1473 pace->trustee = global_sid_World;
1474 pace->attr = ALLOW_ACE;
1475 if (setting_acl) {
1476 pace->perms = 0;
1477 apply_default_perms(params, is_directory, pace, S_IROTH);
1478 } else
1479 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1480
1481 DLIST_ADD(*pp_ace, pace);
1482 }
1483
1484 return True;
1485 }
1486
1487 /****************************************************************************
1488 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1489 If it does not have them, check if there are any entries where the trustee is the
1490 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1491 ****************************************************************************/
1492
1493 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1494 {
1495 bool got_user_obj, got_group_obj;
1496 canon_ace *current_ace;
1497 int i, entries;
1498
1499 entries = count_canon_ace_list(ace);
1500 got_user_obj = False;
1501 got_group_obj = False;
1502
1503 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1504 if (current_ace->type == SMB_ACL_USER_OBJ)
1505 got_user_obj = True;
1506 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1507 got_group_obj = True;
1508 }
1509 if (got_user_obj && got_group_obj) {
1510 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1511 return;
1512 }
1513
1514 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1515 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1516 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1517 current_ace->type = SMB_ACL_USER_OBJ;
1518 got_user_obj = True;
1519 }
1520 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1521 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1522 current_ace->type = SMB_ACL_GROUP_OBJ;
1523 got_group_obj = True;
1524 }
1525 }
1526 if (!got_user_obj)
1527 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1528 if (!got_group_obj)
1529 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1530 }
1531
1532 /****************************************************************************
1533 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1534 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1535 ****************************************************************************/
1536
1537 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1538 {
1539 /* dir ace must be followings.
1540 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1541 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1542 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1543 Posix ACL u:trustee:perm
1544
1545 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1546 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1547 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1548 Posix ACL g:trustee:perm
1549 */
1550
1551 if (ace->type == SMB_ACL_USER_OBJ &&
1552 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1553 canon_ace *dup_ace = dup_canon_ace(ace);
1554
1555 if (dup_ace == NULL) {
1556 return false;
1557 }
1558 dup_ace->type = SMB_ACL_USER;
1559 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1560 }
1561
1562 if (ace->type == SMB_ACL_GROUP_OBJ &&
1563 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1564 canon_ace *dup_ace = dup_canon_ace(ace);
1565
1566 if (dup_ace == NULL) {
1567 return false;
1568 }
1569 dup_ace->type = SMB_ACL_GROUP;
1570 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1571 }
1572
1573 return true;
1574 }
1575
1576 /****************************************************************************
1577 Unpack a struct security_descriptor into two canonical ace lists.
1578 ****************************************************************************/
1579
1580 static bool create_canon_ace_lists(files_struct *fsp,
1581 const SMB_STRUCT_STAT *pst,
1582 struct dom_sid *pfile_owner_sid,
1583 struct dom_sid *pfile_grp_sid,
1584 canon_ace **ppfile_ace,
1585 canon_ace **ppdir_ace,
1586 const struct security_acl *dacl)
1587 {
1588 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1589 canon_ace *file_ace = NULL;
1590 canon_ace *dir_ace = NULL;
1591 canon_ace *current_ace = NULL;
1592 bool got_dir_allow = False;
1593 bool got_file_allow = False;
1594 int i, j;
1595
1596 *ppfile_ace = NULL;
1597 *ppdir_ace = NULL;
1598
1599 /*
1600 * Convert the incoming ACL into a more regular form.
1601 */
1602
1603 for(i = 0; i < dacl->num_aces; i++) {
1604 struct security_ace *psa = &dacl->aces[i];
1605
1606 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1607 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1608 return False;
1609 }
1610
1611 if (nt4_compatible_acls()) {
1612 /*
1613 * The security mask may be UNIX_ACCESS_NONE which should map into
1614 * no permissions (we overload the WRITE_OWNER bit for this) or it
1615 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1616 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1617 */
1618
1619 /*
1620 * Convert GENERIC bits to specific bits.
1621 */
1622
1623 se_map_generic(&psa->access_mask, &file_generic_mapping);
1624
1625 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1626
1627 if(psa->access_mask != UNIX_ACCESS_NONE)
1628 psa->access_mask &= ~UNIX_ACCESS_NONE;
1629 }
1630 }
1631
1632 /*
1633 * Deal with the fact that NT 4.x re-writes the canonical format
1634 * that we return for default ACLs. If a directory ACE is identical
1635 * to a inherited directory ACE then NT changes the bits so that the
1636 * first ACE is set to OI|IO and the second ACE for this SID is set
1637 * to CI. We need to repair this. JRA.
1638 */
1639
1640 for(i = 0; i < dacl->num_aces; i++) {
1641 struct security_ace *psa1 = &dacl->aces[i];
1642
1643 for (j = i + 1; j < dacl->num_aces; j++) {
1644 struct security_ace *psa2 = &dacl->aces[j];
1645
1646 if (psa1->access_mask != psa2->access_mask)
1647 continue;
1648
1649 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1650 continue;
1651
1652 /*
1653 * Ok - permission bits and SIDs are equal.
1654 * Check if flags were re-written.
1655 */
1656
1657 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1658
1659 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1660 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1661
1662 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1663
1664 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1665 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1666
1667 }
1668 }
1669 }
1670
1671 for(i = 0; i < dacl->num_aces; i++) {
1672 struct security_ace *psa = &dacl->aces[i];
1673
1674 /*
1675 * Create a cannon_ace entry representing this NT DACL ACE.
1676 */
1677
1678 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1679 free_canon_ace_list(file_ace);
1680 free_canon_ace_list(dir_ace);
1681 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1682 return False;
1683 }
1684
1685 ZERO_STRUCTP(current_ace);
1686
1687 sid_copy(&current_ace->trustee, &psa->trustee);
1688
1689 /*
1690 * Try and work out if the SID is a user or group
1691 * as we need to flag these differently for POSIX.
1692 * Note what kind of a POSIX ACL this should map to.
1693 */
1694
1695 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1696 current_ace->owner_type = WORLD_ACE;
1697 current_ace->unix_ug.world = -1;
1698 current_ace->type = SMB_ACL_OTHER;
1699 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1700 current_ace->owner_type = UID_ACE;
1701 current_ace->unix_ug.uid = pst->st_ex_uid;
1702 current_ace->type = SMB_ACL_USER_OBJ;
1703
1704 /*
1705 * The Creator Owner entry only specifies inheritable permissions,
1706 * never access permissions. WinNT doesn't always set the ACE to
1707 * INHERIT_ONLY, though.
1708 */
1709
1710 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1711
1712 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1713 current_ace->owner_type = GID_ACE;
1714 current_ace->unix_ug.gid = pst->st_ex_gid;
1715 current_ace->type = SMB_ACL_GROUP_OBJ;
1716
1717 /*
1718 * The Creator Group entry only specifies inheritable permissions,
1719 * never access permissions. WinNT doesn't always set the ACE to
1720 * INHERIT_ONLY, though.
1721 */
1722 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1723
1724 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1725 current_ace->owner_type = UID_ACE;
1726 /* If it's the owning user, this is a user_obj, not
1727 * a user. */
1728 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1729 current_ace->type = SMB_ACL_USER_OBJ;
1730 } else {
1731 current_ace->type = SMB_ACL_USER;
1732 }
1733 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1734 current_ace->owner_type = GID_ACE;
1735 /* If it's the primary group, this is a group_obj, not
1736 * a group. */
1737 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1738 current_ace->type = SMB_ACL_GROUP_OBJ;
1739 } else {
1740 current_ace->type = SMB_ACL_GROUP;
1741 }
1742 } else {
1743 /*
1744 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1745 */
1746
1747 if (non_mappable_sid(&psa->trustee)) {
1748 DEBUG(10, ("create_canon_ace_lists: ignoring "
1749 "non-mappable SID %s\n",
1750 sid_string_dbg(&psa->trustee)));
1751 SAFE_FREE(current_ace);
1752 continue;
1753 }
1754
1755 free_canon_ace_list(file_ace);
1756 free_canon_ace_list(dir_ace);
1757 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1758 "%s to uid or gid.\n",
1759 sid_string_dbg(&current_ace->trustee)));
1760 SAFE_FREE(current_ace);
1761 return False;
1762 }
1763
1764 /*
1765 * Map the given NT permissions into a UNIX mode_t containing only
1766 * S_I(R|W|X)USR bits.
1767 */
1768
1769 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1770 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1771
1772 /* Store the ace_flag. */
1773 current_ace->ace_flags = psa->flags;
1774
1775 /*
1776 * Now add the created ace to either the file list, the directory
1777 * list, or both. We *MUST* preserve the order here (hence we use
1778 * DLIST_ADD_END) as NT ACLs are order dependent.
1779 */
1780
1781 if (fsp->is_directory) {
1782
1783 /*
1784 * We can only add to the default POSIX ACE list if the ACE is
1785 * designed to be inherited by both files and directories.
1786 */
1787
1788 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1789 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1790
1791 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1792
1793 /*
1794 * Note if this was an allow ace. We can't process
1795 * any further deny ace's after this.
1796 */
1797
1798 if (current_ace->attr == ALLOW_ACE)
1799 got_dir_allow = True;
1800
1801 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1802 DEBUG(0,("create_canon_ace_lists: "
1803 "malformed ACL in "
1804 "inheritable ACL! Deny entry "
1805 "after Allow entry. Failing "
1806 "to set on file %s.\n",
1807 fsp_str_dbg(fsp)));
1808 free_canon_ace_list(file_ace);
1809 free_canon_ace_list(dir_ace);
1810 return False;
1811 }
1812
1813 if( DEBUGLVL( 10 )) {
1814 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1815 print_canon_ace( current_ace, 0);
1816 }
1817
1818 /*
1819 * We have a lossy mapping: directory ACE entries
1820 * CREATOR_OWNER ------\
1821 * (map to) +---> SMB_ACL_USER_OBJ
1822 * owning sid ------/
1823 *
1824 * CREATOR_GROUP ------\
1825 * (map to) +---> SMB_ACL_GROUP_OBJ
1826 * primary group sid --/
1827 *
1828 * on set. And on read of a directory ACL
1829 *
1830 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1831 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1832 *
1833 * Deal with this on set by duplicating
1834 * owning sid and primary group sid ACE
1835 * entries into the directory ACL.
1836 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1837 */
1838
1839 if (!dup_owning_ace(dir_ace, current_ace)) {
1840 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1841 free_canon_ace_list(file_ace);
1842 free_canon_ace_list(dir_ace);
1843 return false;
1844 }
1845
1846 /*
1847 * If this is not an inherit only ACE we need to add a duplicate
1848 * to the file acl.
1849 */
1850
1851 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1852 canon_ace *dup_ace = dup_canon_ace(current_ace);
1853
1854 if (!dup_ace) {
1855 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1856 free_canon_ace_list(file_ace);
1857 free_canon_ace_list(dir_ace);
1858 return False;
1859 }
1860
1861 /*
1862 * We must not free current_ace here as its
1863 * pointer is now owned by the dir_ace list.
1864 */
1865 current_ace = dup_ace;
1866 /* We've essentially split this ace into two,
1867 * and added the ace with inheritance request
1868 * bits to the directory ACL. Drop those bits for
1869 * the ACE we're adding to the file list. */
1870 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1871 SEC_ACE_FLAG_CONTAINER_INHERIT|
1872 SEC_ACE_FLAG_INHERIT_ONLY);
1873 } else {
1874 /*
1875 * We must not free current_ace here as its
1876 * pointer is now owned by the dir_ace list.
1877 */
1878 current_ace = NULL;
1879 }
1880 }
1881 }
1882
1883 /*
1884 * Only add to the file ACL if not inherit only.
1885 */
1886
1887 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1888 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1889
1890 /*
1891 * Note if this was an allow ace. We can't process
1892 * any further deny ace's after this.
1893 */
1894
1895 if (current_ace->attr == ALLOW_ACE)
1896 got_file_allow = True;
1897
1898 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1899 DEBUG(0,("create_canon_ace_lists: malformed "
1900 "ACL in file ACL ! Deny entry after "
1901 "Allow entry. Failing to set on file "
1902 "%s.\n", fsp_str_dbg(fsp)));
1903 free_canon_ace_list(file_ace);
1904 free_canon_ace_list(dir_ace);
1905 return False;
1906 }
1907
1908 if( DEBUGLVL( 10 )) {
1909 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1910 print_canon_ace( current_ace, 0);
1911 }
1912 all_aces_are_inherit_only = False;
1913 /*
1914 * We must not free current_ace here as its
1915 * pointer is now owned by the file_ace list.
1916 */
1917 current_ace = NULL;
1918 }
1919
1920 /*
1921 * Free if ACE was not added.
1922 */
1923
1924 SAFE_FREE(current_ace);
1925 }
1926
1927 if (fsp->is_directory && all_aces_are_inherit_only) {
1928 /*
1929 * Windows 2000 is doing one of these weird 'inherit acl'
1930 * traverses to conserve NTFS ACL resources. Just pretend
1931 * there was no DACL sent. JRA.
1932 */
1933
1934 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1935 free_canon_ace_list(file_ace);
1936 free_canon_ace_list(dir_ace);
1937 file_ace = NULL;
1938 dir_ace = NULL;
1939 } else {
1940 /*
1941 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1942 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1943 * entries can be converted to *_OBJ. Usually we will already have these
1944 * entries in the Default ACL, and the Access ACL will not have them.
1945 */
1946 if (file_ace) {
1947 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1948 }
1949 if (dir_ace) {
1950 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1951 }
1952 }
1953
1954 *ppfile_ace = file_ace;
1955 *ppdir_ace = dir_ace;
1956
1957 return True;
1958 }
1959
1960 /****************************************************************************
1961 ASCII art time again... JRA :-).
1962
1963 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1964 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1965 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1966 allow or deny have been merged, so the same SID can only appear once in the deny
1967 list or once in the allow list.
1968
1969 We then process as follows :
1970
1971 ---------------------------------------------------------------------------
1972 First pass - look for a Everyone DENY entry.
1973
1974 If it is deny all (rwx) trunate the list at this point.
1975 Else, walk the list from this point and use the deny permissions of this
1976 entry as a mask on all following allow entries. Finally, delete
1977 the Everyone DENY entry (we have applied it to everything possible).
1978
1979 In addition, in this pass we remove any DENY entries that have
1980 no permissions (ie. they are a DENY nothing).
1981 ---------------------------------------------------------------------------
1982 Second pass - only deal with deny user entries.
1983
1984 DENY user1 (perms XXX)
1985
1986 new_perms = 0
1987 for all following allow group entries where user1 is in group
1988 new_perms |= group_perms;
1989
1990 user1 entry perms = new_perms & ~ XXX;
1991
1992 Convert the deny entry to an allow entry with the new perms and
1993 push to the end of the list. Note if the user was in no groups
1994 this maps to a specific allow nothing entry for this user.
1995
1996 The common case from the NT ACL choser (userX deny all) is
1997 optimised so we don't do the group lookup - we just map to
1998 an allow nothing entry.
1999
2000 What we're doing here is inferring the allow permissions the
2001 person setting the ACE on user1 wanted by looking at the allow
2002 permissions on the groups the user is currently in. This will
2003 be a snapshot, depending on group membership but is the best
2004 we can do and has the advantage of failing closed rather than
2005 open.
2006 ---------------------------------------------------------------------------
2007 Third pass - only deal with deny group entries.
2008
2009 DENY group1 (perms XXX)
2010
2011 for all following allow user entries where user is in group1
2012 user entry perms = user entry perms & ~ XXX;
2013
2014 If there is a group Everyone allow entry with permissions YYY,
2015 convert the group1 entry to an allow entry and modify its
2016 permissions to be :
2017
2018 new_perms = YYY & ~ XXX
2019
2020 and push to the end of the list.
2021
2022 If there is no group Everyone allow entry then convert the
2023 group1 entry to a allow nothing entry and push to the end of the list.
2024
2025 Note that the common case from the NT ACL choser (groupX deny all)
2026 cannot be optimised here as we need to modify user entries who are
2027 in the group to change them to a deny all also.
2028
2029 What we're doing here is modifying the allow permissions of
2030 user entries (which are more specific in POSIX ACLs) to mask
2031 out the explicit deny set on the group they are in. This will
2032 be a snapshot depending on current group membership but is the
2033 best we can do and has the advantage of failing closed rather
2034 than open.
2035 ---------------------------------------------------------------------------
2036 Fourth pass - cope with cumulative permissions.
2037
2038 for all allow user entries, if there exists an allow group entry with
2039 more permissive permissions, and the user is in that group, rewrite the
2040 allow user permissions to contain both sets of permissions.
2041
2042 Currently the code for this is #ifdef'ed out as these semantics make
2043 no sense to me. JRA.
2044 ---------------------------------------------------------------------------
2045
2046 Note we *MUST* do the deny user pass first as this will convert deny user
2047 entries into allow user entries which can then be processed by the deny
2048 group pass.
2049
2050 The above algorithm took a *lot* of thinking about - hence this
2051 explaination :-). JRA.
2052 ****************************************************************************/
2053
2054 /****************************************************************************
2055 Process a canon_ace list entries. This is very complex code. We need
2056 to go through and remove the "deny" permissions from any allow entry that matches
2057 the id of this entry. We have already refused any NT ACL that wasn't in correct
2058 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2059 we just remove it (to fail safe). We have already removed any duplicate ace
2060 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2061 allow entries.
2062 ****************************************************************************/
2063
2064 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2065 {
2066 canon_ace *ace_list = *pp_ace_list;
2067 canon_ace *curr_ace = NULL;
2068 canon_ace *curr_ace_next = NULL;
2069
2070 /* Pass 1 above - look for an Everyone, deny entry. */
2071
2072 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2073 canon_ace *allow_ace_p;
2074
2075 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2076
2077 if (curr_ace->attr != DENY_ACE)
2078 continue;
2079
2080 if (curr_ace->perms == (mode_t)0) {
2081
2082 /* Deny nothing entry - delete. */
2083
2084 DLIST_REMOVE(ace_list, curr_ace);
2085 continue;
2086 }
2087
2088 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2089 continue;
2090
2091 /* JRATEST - assert. */
2092 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2093
2094 if (curr_ace->perms == ALL_ACE_PERMS) {
2095
2096 /*
2097 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2098 * list at this point including this entry.
2099 */
2100
2101 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2102
2103 free_canon_ace_list( curr_ace );
2104 if (prev_entry)
2105 DLIST_REMOVE(ace_list, prev_entry);
2106 else {
2107 /* We deleted the entire list. */
2108 ace_list = NULL;
2109 }
2110 break;
2111 }
2112
2113 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2114
2115 /*
2116 * Only mask off allow entries.
2117 */
2118
2119 if (allow_ace_p->attr != ALLOW_ACE)
2120 continue;
2121
2122 allow_ace_p->perms &= ~curr_ace->perms;
2123 }
2124
2125 /*
2126 * Now it's been applied, remove it.
2127 */
2128
2129 DLIST_REMOVE(ace_list, curr_ace);
2130 }
2131
2132 /* Pass 2 above - deal with deny user entries. */
2133
2134 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2135 mode_t new_perms = (mode_t)0;
2136 canon_ace *allow_ace_p;
2137
2138 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2139
2140 if (curr_ace->attr != DENY_ACE)
2141 continue;
2142
2143 if (curr_ace->owner_type != UID_ACE)
2144 continue;
2145
2146 if (curr_ace->perms == ALL_ACE_PERMS) {
2147
2148 /*
2149 * Optimisation - this is a deny everything to this user.
2150 * Convert to an allow nothing and push to the end of the list.
2151 */
2152
2153 curr_ace->attr = ALLOW_ACE;
2154 curr_ace->perms = (mode_t)0;
2155 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2156 continue;
2157 }
2158
2159 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2160
2161 if (allow_ace_p->attr != ALLOW_ACE)
2162 continue;
2163
2164 /* We process GID_ACE and WORLD_ACE entries only. */
2165
2166 if (allow_ace_p->owner_type == UID_ACE)
2167 continue;
2168
2169 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2170 new_perms |= allow_ace_p->perms;
2171 }
2172
2173 /*
2174 * Convert to a allow entry, modify the perms and push to the end
2175 * of the list.
2176 */
2177
2178 curr_ace->attr = ALLOW_ACE;
2179 curr_ace->perms = (new_perms & ~curr_ace->perms);
2180 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2181 }
2182
2183 /* Pass 3 above - deal with deny group entries. */
2184
2185 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2186 canon_ace *allow_ace_p;
2187 canon_ace *allow_everyone_p = NULL;
2188
2189 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2190
2191 if (curr_ace->attr != DENY_ACE)
2192 continue;
2193
2194 if (curr_ace->owner_type != GID_ACE)
2195 continue;
2196
2197 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2198
2199 if (allow_ace_p->attr != ALLOW_ACE)
2200 continue;
2201
2202 /* Store a pointer to the Everyone allow, if it exists. */
2203 if (allow_ace_p->owner_type == WORLD_ACE)
2204 allow_everyone_p = allow_ace_p;
2205
2206 /* We process UID_ACE entries only. */
2207
2208 if (allow_ace_p->owner_type != UID_ACE)
2209 continue;
2210
2211 /* Mask off the deny group perms. */
2212
2213 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2214 allow_ace_p->perms &= ~curr_ace->perms;
2215 }
2216
2217 /*
2218 * Convert the deny to an allow with the correct perms and
2219 * push to the end of the list.
2220 */
2221
2222 curr_ace->attr = ALLOW_ACE;
2223 if (allow_everyone_p)
2224 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2225 else
2226 curr_ace->perms = (mode_t)0;
2227 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2228 }
2229
2230 /* Doing this fourth pass allows Windows semantics to be layered
2231 * on top of POSIX semantics. I'm not sure if this is desirable.
2232 * For example, in W2K ACLs there is no way to say, "Group X no
2233 * access, user Y full access" if user Y is a member of group X.
2234 * This seems completely broken semantics to me.... JRA.
2235 */
2236
2237 #if 0
2238 /* Pass 4 above - deal with allow entries. */
2239
2240 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2241 canon_ace *allow_ace_p;
2242
2243 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2244
2245 if (curr_ace->attr != ALLOW_ACE)
2246 continue;
2247
2248 if (curr_ace->owner_type != UID_ACE)
2249 continue;
2250
2251 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2252
2253 if (allow_ace_p->attr != ALLOW_ACE)
2254 continue;
2255
2256 /* We process GID_ACE entries only. */
2257
2258 if (allow_ace_p->owner_type != GID_ACE)
2259 continue;
2260
2261 /* OR in the group perms. */
2262
2263 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2264 curr_ace->perms |= allow_ace_p->perms;
2265 }
2266 }
2267 #endif
2268
2269 *pp_ace_list = ace_list;
2270 }
2271
2272 /****************************************************************************
2273 Create a default mode that will be used if a security descriptor entry has
2274 no user/group/world entries.
2275 ****************************************************************************/
2276
2277 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2278 {
2279 int snum = SNUM(fsp->conn);
2280 mode_t and_bits = (mode_t)0;
2281 mode_t or_bits = (mode_t)0;
2282 mode_t mode;
2283
2284 if (interitable_mode) {
2285 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2286 fsp->fsp_name, NULL);
2287 } else {
2288 mode = S_IRUSR;
2289 }
2290
2291 if (fsp->is_directory)
2292 mode |= (S_IWUSR|S_IXUSR);
2293
2294 /*
2295 * Now AND with the create mode/directory mode bits then OR with the
2296 * force create mode/force directory mode bits.
2297 */
2298
2299 if (fsp->is_directory) {
2300 and_bits = lp_dir_security_mask(snum);
2301 or_bits = lp_force_dir_security_mode(snum);
2302 } else {
2303 and_bits = lp_security_mask(snum);
2304 or_bits = lp_force_security_mode(snum);
2305 }
2306
2307 return ((mode & and_bits)|or_bits);
2308 }
2309
2310 /****************************************************************************
2311 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2312 succeeding.
2313 ****************************************************************************/
2314
2315 static bool unpack_canon_ace(files_struct *fsp,
2316 const SMB_STRUCT_STAT *pst,
2317 struct dom_sid *pfile_owner_sid,
2318 struct dom_sid *pfile_grp_sid,
2319 canon_ace **ppfile_ace,
2320 canon_ace **ppdir_ace,
2321 uint32 security_info_sent,
2322 const struct security_descriptor *psd)
2323 {
2324 SMB_STRUCT_STAT st;
2325 canon_ace *file_ace = NULL;
2326 canon_ace *dir_ace = NULL;
2327
2328 *ppfile_ace = NULL;
2329 *ppdir_ace = NULL;
2330
2331 if(security_info_sent == 0) {
2332 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2333 return False;
2334 }
2335
2336 /*
2337 * If no DACL then this is a chown only security descriptor.
2338 */
2339
2340 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2341 return True;
2342
2343 /*
2344 * Now go through the DACL and create the canon_ace lists.
2345 */
2346
2347 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2348 &file_ace, &dir_ace, psd->dacl))
2349 return False;
2350
2351 if ((file_ace == NULL) && (dir_ace == NULL)) {
2352 /* W2K traverse DACL set - ignore. */
2353 return True;
2354 }
2355
2356 /*
2357 * Go through the canon_ace list and merge entries
2358 * belonging to identical users of identical allow or deny type.
2359 * We can do this as all deny entries come first, followed by
2360 * all allow entries (we have mandated this before accepting this acl).
2361 */
2362
2363 print_canon_ace_list( "file ace - before merge", file_ace);
2364 merge_aces( &file_ace, false);
2365
2366 print_canon_ace_list( "dir ace - before merge", dir_ace);
2367 merge_aces( &dir_ace, true);
2368
2369 /*
2370 * NT ACLs are order dependent. Go through the acl lists and
2371 * process DENY entries by masking the allow entries.
2372 */
2373
2374 print_canon_ace_list( "file ace - before deny", file_ace);
2375 process_deny_list(fsp->conn, &file_ace);
2376
2377 print_canon_ace_list( "dir ace - before deny", dir_ace);
2378 process_deny_list(fsp->conn, &dir_ace);
2379
2380 /*
2381 * A well formed POSIX file or default ACL has at least 3 entries, a
2382 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2383 * and optionally a mask entry. Ensure this is the case.
2384 */
2385
2386 print_canon_ace_list( "file ace - before valid", file_ace);
2387
2388 st = *pst;
2389
2390 /*
2391 * A default 3 element mode entry for a file should be r-- --- ---.
2392 * A default 3 element mode entry for a directory should be rwx --- ---.
2393 */
2394
2395 st.st_ex_mode = create_default_mode(fsp, False);
2396
2397 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2398 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2399 free_canon_ace_list(file_ace);
2400 free_canon_ace_list(dir_ace);
2401 return False;
2402 }
2403
2404 print_canon_ace_list( "dir ace - before valid", dir_ace);
2405
2406 /*
2407 * A default inheritable 3 element mode entry for a directory should be the
2408 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2409 * it's a directory.
2410 */
2411
2412 st.st_ex_mode = create_default_mode(fsp, True);
2413
2414 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2415 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2416 free_canon_ace_list(file_ace);
2417 free_canon_ace_list(dir_ace);
2418 return False;
2419 }
2420
2421 print_canon_ace_list( "file ace - return", file_ace);
2422 print_canon_ace_list( "dir ace - return", dir_ace);
2423
2424 *ppfile_ace = file_ace;
2425 *ppdir_ace = dir_ace;
2426 return True;
2427
2428 }
2429
2430 /******************************************************************************
2431 When returning permissions, try and fit NT display
2432 semantics if possible. Note the the canon_entries here must have been malloced.
2433 The list format should be - first entry = owner, followed by group and other user
2434 entries, last entry = other.
2435
2436 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2437 are not ordered, and match on the most specific entry rather than walking a list,
2438 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2439
2440 Entry 0: owner : deny all except read and write.
2441 Entry 1: owner : allow read and write.
2442 Entry 2: group : deny all except read.
2443 Entry 3: group : allow read.
2444 Entry 4: Everyone : allow read.
2445
2446 But NT cannot display this in their ACL editor !
2447 ********************************************************************************/
2448
2449 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2450 {
2451 canon_ace *l_head = *pp_list_head;
2452 canon_ace *owner_ace = NULL;
2453 canon_ace *other_ace = NULL;
2454 canon_ace *ace = NULL;
2455
2456 for (ace = l_head; ace; ace = ace->next) {
2457 if (ace->type == SMB_ACL_USER_OBJ)
2458 owner_ace = ace;
2459 else if (ace->type == SMB_ACL_OTHER) {
2460 /* Last ace - this is "other" */
2461 other_ace = ace;
2462 }
2463 }
2464
2465 if (!owner_ace || !other_ace) {
2466 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2467 filename ));
2468 return;
2469 }
2470
2471 /*
2472 * The POSIX algorithm applies to owner first, and other last,
2473 * so ensure they are arranged in this order.
2474 */
2475
2476 if (owner_ace) {
2477 DLIST_PROMOTE(l_head, owner_ace);
2478 }
2479
2480 if (other_ace) {
2481 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2482 }
2483
2484 /* We have probably changed the head of the list. */
2485
2486 *pp_list_head = l_head;
2487 }
2488
2489 /****************************************************************************
2490 Create a linked list of canonical ACE entries.
2491 ****************************************************************************/
2492
2493 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2494 const char *fname, SMB_ACL_T posix_acl,
2495 const SMB_STRUCT_STAT *psbuf,
2496 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2497 {
2498 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2499 canon_ace *l_head = NULL;
2500 canon_ace *ace = NULL;
2501 canon_ace *next_ace = NULL;
2502 int entry_id = SMB_ACL_FIRST_ENTRY;
2503 SMB_ACL_ENTRY_T entry;
2504 size_t ace_count;
2505
2506 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2507 SMB_ACL_TAG_T tagtype;
2508 SMB_ACL_PERMSET_T permset;
2509 struct dom_sid sid;
2510 posix_id unix_ug;
2511 enum ace_owner owner_type;
2512
2513 entry_id = SMB_ACL_NEXT_ENTRY;
2514
2515 /* Is this a MASK entry ? */
2516 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2517 continue;
2518
2519 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2520 continue;
2521
2522 /* Decide which SID to use based on the ACL type. */
2523 switch(tagtype) {
2524 case SMB_ACL_USER_OBJ:
2525 /* Get the SID from the owner. */
2526 sid_copy(&sid, powner);
2527 unix_ug.uid = psbuf->st_ex_uid;
2528 owner_type = UID_ACE;
2529 break;
2530 case SMB_ACL_USER:
2531 {
2532 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2533 if (puid == NULL) {
2534 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2535 continue;
2536 }
2537 uid_to_sid( &sid, *puid);
2538 unix_ug.uid = *puid;
2539 owner_type = UID_ACE;
2540 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2541 break;
2542 }
2543 case SMB_ACL_GROUP_OBJ:
2544 /* Get the SID from the owning group. */
2545 sid_copy(&sid, pgroup);
2546 unix_ug.gid = psbuf->st_ex_gid;
2547 owner_type = GID_ACE;
2548 break;
2549 case SMB_ACL_GROUP:
2550 {
2551 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2552 if (pgid == NULL) {
2553 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2554 continue;
2555 }
2556 gid_to_sid( &sid, *pgid);
2557 unix_ug.gid = *pgid;
2558 owner_type = GID_ACE;
2559 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2560 break;
2561 }
2562 case SMB_ACL_MASK:
2563 acl_mask = convert_permset_to_mode_t(conn, permset);
2564 continue; /* Don't count the mask as an entry. */
2565 case SMB_ACL_OTHER:
2566 /* Use the Everyone SID */
2567 sid = global_sid_World;
2568 unix_ug.world = -1;
2569 owner_type = WORLD_ACE;
2570 break;
2571 default:
2572 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2573 continue;
2574 }
2575
2576 /*
2577 * Add this entry to the list.
2578 */
2579
2580 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2581 goto fail;
2582
2583 ZERO_STRUCTP(ace);
2584 ace->type = tagtype;
2585 ace->perms = convert_permset_to_mode_t(conn, permset);
2586 ace->attr = ALLOW_ACE;
2587 ace->trustee = sid;
2588 ace->unix_ug = unix_ug;
2589 ace->owner_type = owner_type;
2590 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2591
2592 DLIST_ADD(l_head, ace);
2593 }
2594
2595 /*
2596 * This next call will ensure we have at least a user/group/world set.
2597 */
2598
2599 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2600 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2601 psbuf, False))
2602 goto fail;
2603
2604 /*
2605 * Now go through the list, masking the permissions with the
2606 * acl_mask. Ensure all DENY Entries are at the start of the list.
2607 */
2608
2609 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2610
2611 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2612 next_ace = ace->next;
2613
2614 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2615 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2616 ace->perms &= acl_mask;
2617
2618 if (ace->perms == 0) {
2619 DLIST_PROMOTE(l_head, ace);
2620 }
2621
2622 if( DEBUGLVL( 10 ) ) {
2623 print_canon_ace(ace, ace_count);
2624 }
2625 }
2626
2627 arrange_posix_perms(fname,&l_head );
2628
2629 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2630
2631 return l_head;
2632
2633 fail:
2634
2635 free_canon_ace_list(l_head);
2636 return NULL;
2637 }
2638
2639 /****************************************************************************
2640 Check if the current user group list contains a given group.
2641 ****************************************************************************/
2642
2643 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2644 {
2645 int i;
2646 const UNIX_USER_TOKEN *utok = get_current_utok(conn);
2647
2648 for (i = 0; i < utok->ngroups; i++) {
2649 if (utok->groups[i] == gid) {
2650 return True;
2651 }
2652 }
2653
2654 return False;
2655 }
2656
2657 /****************************************************************************
2658 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2659 ****************************************************************************/
2660
2661 static bool acl_group_override(connection_struct *conn,
2662 const struct smb_filename *smb_fname)
2663 {
2664 if ((errno != EPERM) && (errno != EACCES)) {
2665 return false;
2666 }
2667
2668 /* file primary group == user primary or supplementary group */
2669 if (lp_acl_group_control(SNUM(conn)) &&
2670 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2671 return true;
2672 }
2673
2674 /* user has writeable permission */
2675 if (lp_dos_filemode(SNUM(conn)) &&
2676 can_write_to_file(conn, smb_fname)) {
2677 return true;
2678 }
2679
2680 return false;
2681 }
2682
2683 /****************************************************************************
2684 Attempt to apply an ACL to a file or directory.
2685 ****************************************************************************/
2686
2687 static bool set_canon_ace_list(files_struct *fsp,
2688 canon_ace *the_ace,
2689 bool default_ace,
2690 const SMB_STRUCT_STAT *psbuf,
2691 bool *pacl_set_support)
2692 {
2693 connection_struct *conn = fsp->conn;
2694 bool ret = False;
2695 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2696 canon_ace *p_ace;
2697 int i;
2698 SMB_ACL_ENTRY_T mask_entry;
2699 bool got_mask_entry = False;
2700 SMB_ACL_PERMSET_T mask_permset;
2701 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2702 bool needs_mask = False;
2703 mode_t mask_perms = 0;
2704
2705 /* Use the psbuf that was passed in. */
2706 if (psbuf != &fsp->fsp_name->st) {
2707 fsp->fsp_name->st = *psbuf;
2708 }
2709
2710 #if defined(POSIX_ACL_NEEDS_MASK)
2711 /* HP-UX always wants to have a mask (called "class" there). */
2712 needs_mask = True;
2713 #endif
2714
2715 if (the_acl == NULL) {
2716
2717 if (!no_acl_syscall_error(errno)) {
2718 /*
2719 * Only print this error message if we have some kind of ACL
2720 * support that's not working. Otherwise we would always get this.
2721 */
2722 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2723 default_ace ? "default" : "file", strerror(errno) ));
2724 }
2725 *pacl_set_support = False;
2726 goto fail;
2727 }
2728
2729 if( DEBUGLVL( 10 )) {
2730 dbgtext("set_canon_ace_list: setting ACL:\n");
2731 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2732 print_canon_ace( p_ace, i);
2733 }
2734 }
2735
2736 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2737 SMB_ACL_ENTRY_T the_entry;
2738 SMB_ACL_PERMSET_T the_permset;
2739
2740 /*
2741 * ACLs only "need" an ACL_MASK entry if there are any named user or
2742 * named group entries. But if there is an ACL_MASK entry, it applies
2743 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2744 * so that it doesn't deny (i.e., mask off) any permissions.
2745 */
2746
2747 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2748 needs_mask = True;
2749 mask_perms |= p_ace->perms;
2750 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2751 mask_perms |= p_ace->perms;
2752 }
2753
2754 /*
2755 * Get the entry for this ACE.
2756 */
2757
2758 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2759 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2760 i, strerror(errno) ));
2761 goto fail;
2762 }
2763
2764 if (p_ace->type == SMB_ACL_MASK) {
2765 mask_entry = the_entry;
2766 got_mask_entry = True;
2767 }
2768
2769 /*
2770 * Ok - we now know the ACL calls should be working, don't
2771 * allow fallback to chmod.
2772 */
2773
2774 *pacl_set_support = True;
2775
2776 /*
2777 * Initialise the entry from the canon_ace.
2778 */
2779
2780 /*
2781 * First tell the entry what type of ACE this is.
2782 */
2783
2784 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2785 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2786 i, strerror(errno) ));
2787 goto fail;
2788 }
2789
2790 /*
2791 * Only set the qualifier (user or group id) if the entry is a user
2792 * or group id ACE.
2793 */
2794
2795 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2796 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2797 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2798 i, strerror(errno) ));
2799 goto fail;
2800 }
2801 }
2802
2803 /*
2804 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2805 */
2806
2807 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2808 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2809 i, strerror(errno) ));
2810 goto fail;
2811 }
2812
2813 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2814 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2815 (unsigned int)p_ace->perms, i, strerror(errno) ));
2816 goto fail;
2817 }
2818
2819 /*
2820 * ..and apply them to the entry.
2821 */
2822
2823 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2824 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2825 i, strerror(errno) ));
2826 goto fail;
2827 }
2828
2829 if( DEBUGLVL( 10 ))
2830 print_canon_ace( p_ace, i);
2831
2832 }
2833
2834 if (needs_mask && !got_mask_entry) {
2835 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2836 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2837 goto fail;
2838 }
2839
2840 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2841 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2842 goto fail;
2843 }
2844
2845 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2846 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2847 goto fail;
2848 }
2849
2850 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2851 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2852 goto fail;
2853 }
2854
2855 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2856 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2857 goto fail;
2858 }
2859 }
2860
2861 /*
2862 * Finally apply it to the file or directory.
2863 */
2864
2865 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2866 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2867 the_acl_type, the_acl) == -1) {
2868 /*
2869 * Some systems allow all the above calls and only fail with no ACL support
2870 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2871 */
2872 if (no_acl_syscall_error(errno)) {
2873 *pacl_set_support = False;
2874 }
2875
2876 if (acl_group_override(conn, fsp->fsp_name)) {
2877 int sret;
2878
2879 DEBUG(5,("set_canon_ace_list: acl group "
2880 "control on and current user in file "
2881 "%s primary group.\n",
2882 fsp_str_dbg(fsp)));
2883
2884 become_root();
2885 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2886 fsp->fsp_name->base_name, the_acl_type,
2887 the_acl);
2888 unbecome_root();
2889 if (sret == 0) {
2890 ret = True;
2891 }
2892 }
2893
2894 if (ret == False) {
2895 DEBUG(2,("set_canon_ace_list: "
2896 "sys_acl_set_file type %s failed for "
2897 "file %s (%s).\n",
2898 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2899 "directory default" : "file",
2900 fsp_str_dbg(fsp), strerror(errno)));
2901 goto fail;
2902 }
2903 }
2904 } else {
2905 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2906 /*
2907 * Some systems allow all the above calls and only fail with no ACL support
2908 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2909 */
2910 if (no_acl_syscall_error(errno)) {
2911 *pacl_set_support = False;
2912 }
2913
2914 if (acl_group_override(conn, fsp->fsp_name)) {
2915 int sret;
2916
2917 DEBUG(5,("set_canon_ace_list: acl group "
2918 "control on and current user in file "
2919 "%s primary group.\n",
2920 fsp_str_dbg(fsp)));
2921
2922 become_root();
2923 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2924 unbecome_root();
2925 if (sret == 0) {
2926 ret = True;
2927 }
2928 }
2929
2930 if (ret == False) {
2931 DEBUG(2,("set_canon_ace_list: "
2932 "sys_acl_set_file failed for file %s "
2933 "(%s).\n",
2934 fsp_str_dbg(fsp), strerror(errno)));
2935 goto fail;
2936 }
2937 }
2938 }
2939
2940 ret = True;
2941
2942 fail:
2943
2944 if (the_acl != NULL) {
2945 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2946 }
2947
2948 return ret;
2949 }
2950
2951 /****************************************************************************
2952 Find a particular canon_ace entry.
2953 ****************************************************************************/
2954
2955 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2956 {
2957 while (list) {
2958 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2959 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2960 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2961 break;
2962 list = list->next;
2963 }
2964 return list;
2965 }
2966
2967 /****************************************************************************
2968
2969 ****************************************************************************/
2970
2971 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2972 {
2973 SMB_ACL_ENTRY_T entry;
2974
2975 if (!the_acl)
2976 return NULL;
2977 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2978 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2979 return NULL;
2980 }
2981 return the_acl;
2982 }
2983
2984 /****************************************************************************
2985 Convert a canon_ace to a generic 3 element permission - if possible.
2986 ****************************************************************************/
2987
2988 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2989
2990 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2991 {
2992 int snum = SNUM(fsp->conn);
2993 size_t ace_count = count_canon_ace_list(file_ace_list);
2994 canon_ace *ace_p;
2995 canon_ace *owner_ace = NULL;
2996 canon_ace *group_ace = NULL;
2997 canon_ace *other_ace = NULL;
2998 mode_t and_bits;
2999 mode_t or_bits;
3000
3001 if (ace_count != 3) {
3002 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3003 "entries for file %s to convert to posix perms.\n",
3004 fsp_str_dbg(fsp)));
3005 return False;
3006 }
3007
3008 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3009 if (ace_p->owner_type == UID_ACE)
3010 owner_ace = ace_p;
3011 else if (ace_p->owner_type == GID_ACE)
3012 group_ace = ace_p;
3013 else if (ace_p->owner_type == WORLD_ACE)
3014 other_ace = ace_p;
3015 }
3016
3017 if (!owner_ace || !group_ace || !other_ace) {
3018 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3019 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3020 return False;
3021 }
3022
3023 *posix_perms = (mode_t)0;
3024
3025 *posix_perms |= owner_ace->perms;
3026 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3027 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3028 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3029 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3030 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3031 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3032
3033 /* The owner must have at least read access. */
3034
3035 *posix_perms |= S_IRUSR;
3036 if (fsp->is_directory)
3037 *posix_perms |= (S_IWUSR|S_IXUSR);
3038
3039 /* If requested apply the masks. */
3040
3041 /* Get the initial bits to apply. */
3042
3043 if (fsp->is_directory) {
3044 and_bits = lp_dir_security_mask(snum);
3045 or_bits = lp_force_dir_security_mode(snum);
3046 } else {
3047 and_bits = lp_security_mask(snum);
3048 or_bits = lp_force_security_mode(snum);
3049 }
3050
3051 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3052
3053 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3054 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3055 (int)group_ace->perms, (int)other_ace->perms,
3056 (int)*posix_perms, fsp_str_dbg(fsp)));
3057
3058 return True;
3059 }
3060
3061 /****************************************************************************
3062 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3063 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3064 with CI|OI set so it is inherited and also applies to the directory.
3065 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3066 ****************************************************************************/
3067
3068 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3069 {
3070 size_t i, j;
3071
3072 for (i = 0; i < num_aces; i++) {
3073 for (j = i+1; j < num_aces; j++) {
3074 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3075 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3076 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3077 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3078
3079 /* We know the lower number ACE's are file entries. */
3080 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3081 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3082 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3083 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3084 (i_inh == j_inh) &&
3085 (i_flags_ni == 0) &&
3086 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3087 SEC_ACE_FLAG_CONTAINER_INHERIT|
3088 SEC_ACE_FLAG_INHERIT_ONLY))) {
3089 /*
3090 * W2K wants to have access allowed zero access ACE's
3091 * at the end of the list. If the mask is zero, merge
3092 * the non-inherited ACE onto the inherited ACE.
3093 */
3094
3095 if (nt_ace_list[i].access_mask == 0) {
3096 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3097 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3098 if (num_aces - i - 1 > 0)
3099 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3100 sizeof(struct security_ace));
3101
3102 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3103 (unsigned int)i, (unsigned int)j ));
3104 } else {
3105 /*
3106 * These are identical except for the flags.
3107 * Merge the inherited ACE onto the non-inherited ACE.
3108 */
3109
3110 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3111 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3112 if (num_aces - j - 1 > 0)
3113 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3114 sizeof(struct security_ace));
3115
3116 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3117 (unsigned int)j, (unsigned int)i ));
3118 }
3119 num_aces--;
3120 break;
3121 }
3122 }
3123 }
3124
3125 return num_aces;
3126 }
3127
3128 /*
3129 * Add or Replace ACE entry.
3130 * In some cases we need to add a specific ACE for compatibility reasons.
3131 * When doing that we must make sure we are not actually creating a duplicate
3132 * entry. So we need to search whether an ACE entry already exist and eventually
3133 * replacce the access mask, or add a completely new entry if none was found.
3134 *
3135 * This function assumes the array has enough space to add a new entry without
3136 * any reallocation of memory.
3137 */
3138
3139 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3140 const struct dom_sid *sid, enum security_ace_type type,
3141 uint32_t mask, uint8_t flags)
3142 {
3143 int i;
3144
3145 /* first search for a duplicate */
3146 for (i = 0; i < *num_aces; i++) {
3147 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3148 (nt_ace_list[i].flags == flags)) break;
3149 }
3150
3151 if (i < *num_aces) { /* found */
3152 nt_ace_list[i].type = type;
3153 nt_ace_list[i].access_mask = mask;
3154 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3155 i, sid_string_dbg(sid), flags));
3156 return;
3157 }
3158
3159 /* not found, append it */
3160 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3161 }
3162
3163
3164 /****************************************************************************
3165 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3166 the space for the return elements and returns the size needed to return the
3167 security descriptor. This should be the only external function needed for
3168 the UNIX style get ACL.
3169 ****************************************************************************/
3170
3171 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3172 const char *name,
3173 const SMB_STRUCT_STAT *sbuf,
3174 struct pai_val *pal,
3175 SMB_ACL_T posix_acl,
3176 SMB_ACL_T def_acl,
3177 uint32_t security_info,
3178 struct security_descriptor **ppdesc)
3179 {
3180 struct dom_sid owner_sid;
3181 struct dom_sid group_sid;
3182 size_t sd_size = 0;
3183 struct security_acl *psa = NULL;
3184 size_t num_acls = 0;
3185 size_t num_def_acls = 0;
3186 size_t num_aces = 0;
3187 canon_ace *file_ace = NULL;
3188 canon_ace *dir_ace = NULL;
3189 struct security_ace *nt_ace_list = NULL;
3190 size_t num_profile_acls = 0;
3191 struct dom_sid orig_owner_sid;
3192 struct security_descriptor *psd = NULL;
3193 int i;
3194
3195 /*
3196 * Get the owner, group and world SIDs.
3197 */
3198
3199 create_file_sids(sbuf, &owner_sid, &group_sid);
3200
3201 if (lp_profile_acls(SNUM(conn))) {
3202 /* For WXP SP1 the owner must be administrators. */
3203 sid_copy(&orig_owner_sid, &owner_sid);
3204 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3205 sid_copy(&group_sid, &global_sid_Builtin_Users);
3206 num_profile_acls = 3;
3207 }
3208
3209 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3210
3211 /*
3212 * In the optimum case Creator Owner and Creator Group would be used for
3213 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3214 * would lead to usability problems under Windows: The Creator entries
3215 * are only available in browse lists of directories and not for files;
3216 * additionally the identity of the owning group couldn't be determined.
3217 * We therefore use those identities only for Default ACLs.
3218 */
3219
3220 /* Create the canon_ace lists. */
3221 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3222 &owner_sid, &group_sid, pal,
3223 SMB_ACL_TYPE_ACCESS);
3224
3225 /* We must have *some* ACLS. */
3226
3227 if (count_canon_ace_list(file_ace) == 0) {
3228 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3229 goto done;
3230 }
3231
3232 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3233 dir_ace = canonicalise_acl(conn, name, def_acl,
3234 sbuf,
3235 &global_sid_Creator_Owner,
3236 &global_sid_Creator_Group,
3237 pal, SMB_ACL_TYPE_DEFAULT);
3238 }
3239
3240 /*
3241 * Create the NT ACE list from the canonical ace lists.
3242 */
3243
3244 {
3245 canon_ace *ace;
3246 enum security_ace_type nt_acl_type;
3247
3248 if (nt4_compatible_acls() && dir_ace) {
3249 /*
3250 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3251 * but no non-INHERIT_ONLY entry for one SID. So we only
3252 * remove entries from the Access ACL if the
3253 * corresponding Default ACL entries have also been
3254 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3255 * are exceptions. We can do nothing
3256 * intelligent if the Default ACL contains entries that
3257 * are not also contained in the Access ACL, so this
3258 * case will still fail under NT 4.
3259 */
3260
3261 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3262 if (ace && !ace->perms) {
3263 DLIST_REMOVE(dir_ace, ace);
3264 SAFE_FREE(ace);
3265
3266 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3267 if (ace && !ace->perms) {
3268 DLIST_REMOVE(file_ace, ace);
3269 SAFE_FREE(ace);
3270 }
3271 }
3272
3273 /*
3274 * WinNT doesn't usually have Creator Group
3275 * in browse lists, so we send this entry to
3276 * WinNT even if it contains no relevant
3277 * permissions. Once we can add
3278 * Creator Group to browse lists we can
3279 * re-enable this.
3280 */
3281
3282 #if 0
3283 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3284 if (ace && !ace->perms) {
3285 DLIST_REMOVE(dir_ace, ace);
3286 SAFE_FREE(ace);
3287 }
3288 #endif
3289
3290 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3291 if (ace && !ace->perms) {
3292 DLIST_REMOVE(file_ace, ace);
3293 SAFE_FREE(ace);
3294 }
3295 }
3296
3297 num_acls = count_canon_ace_list(file_ace);
3298 num_def_acls = count_canon_ace_list(dir_ace);
3299
3300 /* Allocate the ace list. */
3301 if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3302 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3303 goto done;
3304 }
3305
3306 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3307
3308 /*
3309 * Create the NT ACE list from the canonical ace lists.
3310 */
3311
3312 for (ace = file_ace; ace != NULL; ace = ace->next) {
3313 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3314 &nt_acl_type,
3315 ace->perms,
3316 S_ISDIR(sbuf->st_ex_mode));
3317 init_sec_ace(&nt_ace_list[num_aces++],
3318 &ace->trustee,
3319 nt_acl_type,
3320 acc,
3321 ace->ace_flags);
3322 }
3323
3324 /* The User must have access to a profile share - even
3325 * if we can't map the SID. */
3326 if (lp_profile_acls(SNUM(conn))) {
3327 add_or_replace_ace(nt_ace_list, &num_aces,
3328 &global_sid_Builtin_Users,
3329 SEC_ACE_TYPE_ACCESS_ALLOWED,
3330 FILE_GENERIC_ALL, 0);
3331 }
3332
3333 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3334 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3335 &nt_acl_type,
3336 ace->perms,
3337 S_ISDIR(sbuf->st_ex_mode));
3338 init_sec_ace(&nt_ace_list[num_aces++],
3339 &ace->trustee,
3340 nt_acl_type,
3341 acc,
3342 ace->ace_flags |
3343 SEC_ACE_FLAG_OBJECT_INHERIT|
3344 SEC_ACE_FLAG_CONTAINER_INHERIT|
3345 SEC_ACE_FLAG_INHERIT_ONLY);
3346 }
3347
3348 /* The User must have access to a profile share - even
3349 * if we can't map the SID. */
3350 if (lp_profile_acls(SNUM(conn))) {
3351 add_or_replace_ace(nt_ace_list, &num_aces,
3352 &global_sid_Builtin_Users,
3353 SEC_ACE_TYPE_ACCESS_ALLOWED,
3354 FILE_GENERIC_ALL,
3355 SEC_ACE_FLAG_OBJECT_INHERIT |
3356 SEC_ACE_FLAG_CONTAINER_INHERIT |
3357 SEC_ACE_FLAG_INHERIT_ONLY);
3358 }
3359
3360 /*
3361 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3362 * Win2K needs this to get the inheritance correct when replacing ACLs
3363 * on a directory tree. Based on work by Jim @ IBM.
3364 */
3365
3366 num_aces = merge_default_aces(nt_ace_list, num_aces);
3367
3368 if (lp_profile_acls(SNUM(conn))) {
3369 for (i = 0; i < num_aces; i++) {
3370 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3371 add_or_replace_ace(nt_ace_list, &num_aces,
3372 &orig_owner_sid,
3373 nt_ace_list[i].type,
3374 nt_ace_list[i].access_mask,
3375 nt_ace_list[i].flags);
3376 break;
3377 }
3378 }
3379 }
3380 }
3381
3382 if (num_aces) {
3383 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3384 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3385 goto done;
3386 }
3387 }
3388 } /* security_info & SECINFO_DACL */
3389
3390 psd = make_standard_sec_desc( talloc_tos(),
3391 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3392 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3393 psa,
3394 &sd_size);
3395
3396 if(!psd) {
3397 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3398 sd_size = 0;
3399 goto done;
3400 }
3401
3402 /*
3403 * Windows 2000: The DACL_PROTECTED flag in the security
3404 * descriptor marks the ACL as non-inheriting, i.e., no
3405 * ACEs from higher level directories propagate to this
3406 * ACL. In the POSIX ACL model permissions are only
3407 * inherited at file create time, so ACLs never contain
3408 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3409 * flag doesn't seem to bother Windows NT.
3410 * Always set this if map acl inherit is turned off.
3411 */
3412 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3413 psd->type |= SEC_DESC_DACL_PROTECTED;
3414 } else {
3415 psd->type |= pal->sd_type;
3416 }
3417
3418 if (psd->dacl) {
3419 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3420 }
3421
3422 *ppdesc = psd;
3423
3424 done:
3425
3426 if (posix_acl) {
3427 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3428 }
3429 if (def_acl) {
3430 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3431 }
3432 free_canon_ace_list(file_ace);
3433 free_canon_ace_list(dir_ace);
3434 free_inherited_info(pal);
3435 SAFE_FREE(nt_ace_list);
3436
3437 return NT_STATUS_OK;
3438 }
3439
3440 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3441 struct security_descriptor **ppdesc)
3442 {
3443 SMB_STRUCT_STAT sbuf;
3444 SMB_ACL_T posix_acl = NULL;
3445 struct pai_val *pal;
3446
3447 *ppdesc = NULL;
3448
3449 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3450 fsp_str_dbg(fsp)));
3451
3452 /* can it happen that fsp_name == NULL ? */
3453 if (fsp->is_directory || fsp->fh->fd == -1) {
3454 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3455 security_info, ppdesc);
3456 }
3457
3458 /* Get the stat struct for the owner info. */
3459 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3460 return map_nt_error_from_unix(errno);
3461 }
3462
3463 /* Get the ACL from the fd. */
3464 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3465
3466 pal = fload_inherited_info(fsp);
3467
3468 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3469 &sbuf, pal, posix_acl, NULL,
3470 security_info, ppdesc);
3471 }
3472
3473 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3474 uint32_t security_info, struct security_descriptor **ppdesc)
3475 {
3476 SMB_ACL_T posix_acl = NULL;
3477 SMB_ACL_T def_acl = NULL;
3478 struct pai_val *pal;
3479 struct smb_filename smb_fname;
3480 int ret;
3481
3482 *ppdesc = NULL;
3483
3484 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3485
3486 ZERO_STRUCT(smb_fname);
3487 smb_fname.base_name = discard_const_p(char, name);
3488
3489 /* Get the stat struct for the owner info. */
3490 if (lp_posix_pathnames()) {
3491 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3492 } else {
3493 ret = SMB_VFS_STAT(conn, &smb_fname);
3494 }
3495
3496 if (ret == -1) {
3497 return map_nt_error_from_unix(errno);
3498 }
3499
3500 /* Get the ACL from the path. */
3501 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3502
3503 /* If it's a directory get the default POSIX ACL. */
3504 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3505 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3506 def_acl = free_empty_sys_acl(conn, def_acl);
3507 }
3508
3509 pal = load_inherited_info(conn, name);
3510
3511 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3512 posix_acl, def_acl, security_info,
3513 ppdesc);
3514 }
3515
3516 /****************************************************************************
3517 Try to chown a file. We will be able to chown it under the following conditions.
3518
3519 1) If we have root privileges, then it will just work.
3520 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3521 3) If we have SeRestorePrivilege we can change the user to any other user.
3522 4) If we have write permission to the file and dos_filemodes is set
3523 then allow chown to the currently authenticated user.
3524 ****************************************************************************/
3525
3526 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3527 uid_t uid, gid_t gid)
3528 {
3529 int ret;
3530 files_struct *fsp;
3531
3532 if(!CAN_WRITE(conn)) {
3533 return -1;
3534 }
3535
3536 /* Case (1). */
3537 /* try the direct way first */
3538 if (lp_posix_pathnames()) {
3539 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3540 } else {
3541 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3542 }
3543
3544 if (ret == 0)
3545 return 0;
3546
3547 /* Case (2) / (3) */
3548 if (lp_enable_privileges()) {
3549
3550 bool has_take_ownership_priv = user_has_privileges(get_current_nttok(conn),
3551 &se_take_ownership);
3552 bool has_restore_priv = user_has_privileges(get_current_nttok(conn),
3553 &se_restore);
3554
3555 /* Case (2) */
3556 if ( ( has_take_ownership_priv && ( uid == get_current_uid(conn) ) ) ||
3557 /* Case (3) */
3558 ( has_restore_priv ) ) {
3559
3560 become_root();
3561 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3562 if (lp_posix_pathnames()) {
3563 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3564 (gid_t)-1);
3565 } else {
3566 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3567 (gid_t)-1);
3568 }
3569 unbecome_root();
3570 return ret;
3571 }
3572 }
3573
3574 /* Case (4). */
3575 if (!lp_dos_filemode(SNUM(conn))) {
3576 errno = EPERM;
3577 return -1;
3578 }
3579
3580 /* only allow chown to the current user. This is more secure,
3581 and also copes with the case where the SID in a take ownership ACL is
3582 a local SID on the users workstation
3583 */
3584 if (uid != get_current_uid(conn)) {
3585 errno = EPERM;
3586 return -1;
3587 }
3588
3589 if (lp_posix_pathnames()) {
3590 ret = SMB_VFS_LSTAT(conn, smb_fname);
3591 } else {
3592 ret = SMB_VFS_STAT(conn, smb_fname);
3593 }
3594
3595 if (ret == -1) {
3596 return -1;
3597 }
3598
3599 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3600 return -1;
3601 }
3602
3603 become_root();
3604 /* Keep the current file gid the same. */
3605 if (fsp->fh->fd == -1) {
3606 if (lp_posix_pathnames()) {
3607 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3608 (gid_t)-1);
3609 } else {
3610 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3611 (gid_t)-1);
3612 }
3613 } else {
3614 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3615 }
3616 unbecome_root();
3617
3618 close_file_fchmod(NULL, fsp);
3619
3620 return ret;
3621 }
3622
3623 #if 0
3624 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3625
3626 /****************************************************************************
3627 Take care of parent ACL inheritance.
3628 ****************************************************************************/
3629
3630 NTSTATUS append_parent_acl(files_struct *fsp,
3631 const struct security_descriptor *pcsd,
3632 struct security_descriptor **pp_new_sd)
3633 {
3634 struct smb_filename *smb_dname = NULL;
3635 struct security_descriptor *parent_sd = NULL;
3636 files_struct *parent_fsp = NULL;
3637 TALLOC_CTX *mem_ctx = talloc_tos();
3638 char *parent_name = NULL;
3639 struct security_ace *new_ace = NULL;
3640 unsigned int num_aces = pcsd->dacl->num_aces;
3641 NTSTATUS status;
3642 int info;
3643 unsigned int i, j;
3644 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3645 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3646
3647 if (psd == NULL) {
3648 return NT_STATUS_NO_MEMORY;
3649 }
3650
3651 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3652 NULL)) {
3653 return NT_STATUS_NO_MEMORY;
3654 }
3655
3656 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3657 &smb_dname);
3658 if (!NT_STATUS_IS_OK(status)) {
3659 goto fail;
3660 }
3661
3662 status = SMB_VFS_CREATE_FILE(
3663 fsp->conn, /* conn */
3664 NULL, /* req */
3665 0, /* root_dir_fid */
3666 smb_dname, /* fname */
3667 FILE_READ_ATTRIBUTES, /* access_mask */
3668 FILE_SHARE_NONE, /* share_access */
3669 FILE_OPEN, /* create_disposition*/
3670 FILE_DIRECTORY_FILE, /* create_options */
3671 0, /* file_attributes */
3672 INTERNAL_OPEN_ONLY, /* oplock_request */
3673 0, /* allocation_size */
3674 NULL, /* sd */
3675 NULL, /* ea_list */
3676 &parent_fsp, /* result */
3677 &info); /* pinfo */
3678
3679 if (!NT_STATUS_IS_OK(status)) {
3680 TALLOC_FREE(smb_dname);
3681 return status;
3682 }
3683
3684 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3685 SECINFO_DACL, &parent_sd );
3686
3687 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3688 TALLOC_FREE(smb_dname);
3689
3690 if (!NT_STATUS_IS_OK(status)) {
3691 return status;
3692 }
3693
3694 /*
3695 * Make room for potentially all the ACLs from
3696 * the parent. We used to add the ugw triple here,
3697 * as we knew we were dealing with POSIX ACLs.
3698 * We no longer need to do so as we can guarentee
3699 * that a default ACL from the parent directory will
3700 * be well formed for POSIX ACLs if it came from a
3701 * POSIX ACL source, and if we're not writing to a
3702 * POSIX ACL sink then we don't care if it's not well
3703 * formed. JRA.
3704 */
3705
3706 num_aces += parent_sd->dacl->num_aces;
3707
3708 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, struct security_ace,
3709 num_aces)) == NULL) {
3710 return NT_STATUS_NO_MEMORY;
3711 }
3712
3713 /* Start by copying in all the given ACE entries. */
3714 for (i = 0; i < psd->dacl->num_aces; i++) {
3715 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3716 }
3717
3718 /*
3719 * Note that we're ignoring "inherit permissions" here
3720 * as that really only applies to newly created files. JRA.
3721 */
3722
3723 /* Finally append any inherited ACEs. */
3724 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3725 struct security_ace *se = &parent_sd->dacl->aces[j];
3726
3727 if (fsp->is_directory) {
3728 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3729 /* Doesn't apply to a directory - ignore. */
3730 DEBUG(10,("append_parent_acl: directory %s "
3731 "ignoring non container "
3732 "inherit flags %u on ACE with sid %s "
3733 "from parent %s\n",
3734 fsp_str_dbg(fsp),
3735 (unsigned int)se->flags,
3736 sid_string_dbg(&se->trustee),
3737 parent_name));
3738 continue;
3739 }
3740 } else {
3741 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3742 /* Doesn't apply to a file - ignore. */
3743 DEBUG(10,("append_parent_acl: file %s "
3744 "ignoring non object "
3745 "inherit flags %u on ACE with sid %s "
3746 "from parent %s\n",
3747 fsp_str_dbg(fsp),
3748 (unsigned int)se->flags,
3749 sid_string_dbg(&se->trustee),
3750 parent_name));
3751 continue;
3752 }
3753 }
3754
3755 if (is_dacl_protected) {
3756 /* If the DACL is protected it means we must
3757 * not overwrite an existing ACE entry with the
3758 * same SID. This is order N^2. Ouch :-(. JRA. */
3759 unsigned int k;
3760 for (k = 0; k < psd->dacl->num_aces; k++) {
3761 if (sid_equal(&psd->dacl->aces[k].trustee,
3762 &se->trustee)) {
3763 break;
3764 }
3765 }
3766 if (k < psd->dacl->num_aces) {
3767 /* SID matched. Ignore. */
3768 DEBUG(10,("append_parent_acl: path %s "
3769 "ignoring ACE with protected sid %s "
3770 "from parent %s\n",
3771 fsp_str_dbg(fsp),
3772 sid_string_dbg(&se->trustee),
3773 parent_name));
3774 continue;
3775 }
3776 }
3777
3778 sec_ace_copy(&new_ace[i], se);
3779 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3780 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3781 }
3782 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3783
3784 if (fsp->is_directory) {
3785 /*
3786 * Strip off any inherit only. It's applied.
3787 */
3788 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3789 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3790 /* No further inheritance. */
3791 new_ace[i].flags &=
3792 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3793 SEC_ACE_FLAG_OBJECT_INHERIT);
3794 }
3795 } else {
3796 /*
3797 * Strip off any container or inherit
3798 * flags, they can't apply to objects.
3799 */
3800 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3801 SEC_ACE_FLAG_INHERIT_ONLY|
3802 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3803 }
3804 i++;
3805
3806 DEBUG(10,("append_parent_acl: path %s "
3807 "inheriting ACE with sid %s "
3808 "from parent %s\n",
3809 fsp_str_dbg(fsp),
3810 sid_string_dbg(&se->trustee),
3811 parent_name));
3812 }
3813
3814 psd->dacl->aces = new_ace;
3815 psd->dacl->num_aces = i;
3816 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3817 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3818
3819 *pp_new_sd = psd;
3820 return status;
3821 }
3822 #endif
3823
3824 /****************************************************************************
3825 Reply to set a security descriptor on an fsp. security_info_sent is the
3826 description of the following NT ACL.
3827 This should be the only external function needed for the UNIX style set ACL.
3828 ****************************************************************************/
3829
3830 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd)
3831 {
3832 connection_struct *conn = fsp->conn;
3833 uid_t user = (uid_t)-1;
3834 gid_t grp = (gid_t)-1;
3835 struct dom_sid file_owner_sid;
3836 struct dom_sid file_grp_sid;
3837 canon_ace *file_ace_list = NULL;
3838 canon_ace *dir_ace_list = NULL;
3839 bool acl_perms = False;
3840 mode_t orig_mode = (mode_t)0;
3841 NTSTATUS status;
3842 bool set_acl_as_root = false;
3843 bool acl_set_support = false;
3844 bool ret = false;
3845
3846 DEBUG(10,("set_nt_acl: called for file %s\n",
3847 fsp_str_dbg(fsp)));
3848
3849 if (!CAN_WRITE(conn)) {
3850 DEBUG(10,("set acl rejected on read-only share\n"));
3851 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3852 }
3853
3854 /*
3855 * Get the current state of the file.
3856 */
3857
3858 status = vfs_stat_fsp(fsp);
3859 if (!NT_STATUS_IS_OK(status)) {
3860 return status;
3861 }
3862
3863 /* Save the original element we check against. */
3864 orig_mode = fsp->fsp_name->st.st_ex_mode;
3865
3866 /*
3867 * Unpack the user/group/world id's.
3868 */
3869
3870 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3871 if (!NT_STATUS_IS_OK(status)) {
3872 return status;
3873 }
3874
3875 /*
3876 * Do we need to chown ? If so this must be done first as the incoming
3877 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3878 * Noticed by Simo.
3879 */
3880
3881 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3882 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3883
3884 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3885 fsp_str_dbg(fsp), (unsigned int)user,
3886 (unsigned int)grp));
3887
3888 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3889 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3890 "= %s.\n", fsp_str_dbg(fsp),
3891 (unsigned int)user, (unsigned int)grp,
3892 strerror(errno)));
3893 if (errno == EPERM) {
3894 return NT_STATUS_INVALID_OWNER;
3895 }
3896 return map_nt_error_from_unix(errno);
3897 }
3898
3899 /*
3900 * Recheck the current state of the file, which may have changed.
3901 * (suid/sgid bits, for instance)
3902 */
3903
3904 status = vfs_stat_fsp(fsp);
3905 if (!NT_STATUS_IS_OK(status)) {
3906 return status;
3907 }
3908
3909 /* Save the original element we check against. */
3910 orig_mode = fsp->fsp_name->st.st_ex_mode;
3911
3912 /* If we successfully chowned, we know we must
3913 * be able to set the acl, so do it as root.
3914 */
3915 set_acl_as_root = true;
3916 }
3917
3918 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3919
3920 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3921 &file_grp_sid, &file_ace_list,
3922 &dir_ace_list, security_info_sent, psd);
3923
3924 /* Ignore W2K traverse DACL set. */
3925 if (!file_ace_list && !dir_ace_list) {
3926 return NT_STATUS_OK;
3927 }
3928
3929 if (!acl_perms) {
3930 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3931 free_canon_ace_list(file_ace_list);
3932 free_canon_ace_list(dir_ace_list);
3933 return NT_STATUS_ACCESS_DENIED;
3934 }
3935
3936 /*
3937 * Only change security if we got a DACL.
3938 */
3939
3940 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3941 free_canon_ace_list(file_ace_list);
3942 free_canon_ace_list(dir_ace_list);
3943 return NT_STATUS_OK;
3944 }
3945
3946 /*
3947 * Try using the POSIX ACL set first. Fall back to chmod if
3948 * we have no ACL support on this filesystem.
3949 */
3950
3951 if (acl_perms && file_ace_list) {
3952 if (set_acl_as_root) {
3953 become_root();
3954 }
3955 ret = set_canon_ace_list(fsp, file_ace_list, false,
3956 &fsp->fsp_name->st, &acl_set_support);
3957 if (set_acl_as_root) {
3958 unbecome_root();
3959 }
3960 if (acl_set_support && ret == false) {
3961 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3962 "%s (%s).\n", fsp_str_dbg(fsp),
3963 strerror(errno)));
3964 free_canon_ace_list(file_ace_list);
3965 free_canon_ace_list(dir_ace_list);
3966 return map_nt_error_from_unix(errno);
3967 }
3968 }
3969
3970 if (acl_perms && acl_set_support && fsp->is_directory) {
3971 if (dir_ace_list) {
3972 if (set_acl_as_root) {
3973 become_root();
3974 }
3975 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3976 &fsp->fsp_name->st,
3977 &acl_set_support);
3978 if (set_acl_as_root) {
3979 unbecome_root();
3980 }
3981 if (ret == false) {
3982 DEBUG(3,("set_nt_acl: failed to set default "
3983 "acl on directory %s (%s).\n",
3984 fsp_str_dbg(fsp), strerror(errno)));
3985 free_canon_ace_list(file_ace_list);
3986 free_canon_ace_list(dir_ace_list);
3987 return map_nt_error_from_unix(errno);
3988 }
3989 } else {
3990 int sret = -1;
3991
3992 /*
3993 * No default ACL - delete one if it exists.
3994 */
3995
3996 if (set_acl_as_root) {
3997 become_root();
3998 }
3999 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4000 fsp->fsp_name->base_name);
4001 if (set_acl_as_root) {
4002 unbecome_root();
4003 }
4004 if (sret == -1) {
4005 if (acl_group_override(conn, fsp->fsp_name)) {
4006 DEBUG(5,("set_nt_acl: acl group "
4007 "control on and current user "
4008 "in file %s primary group. "
4009 "Override delete_def_acl\n",
4010 fsp_str_dbg(fsp)));
4011
4012 become_root();
4013 sret =
4014 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4015 conn,
4016 fsp->fsp_name->base_name);
4017 unbecome_root();
4018 }
4019
4020 if (sret == -1) {
4021 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4022 free_canon_ace_list(file_ace_list);
4023 free_canon_ace_list(dir_ace_list);
4024 return map_nt_error_from_unix(errno);
4025 }
4026 }
4027 }
4028 }
4029
4030 if (acl_set_support) {
4031 if (set_acl_as_root) {
4032 become_root();
4033 }
4034 store_inheritance_attributes(fsp,
4035 file_ace_list,
4036 dir_ace_list,
4037 psd->type);
4038 if (set_acl_as_root) {
4039 unbecome_root();
4040 }
4041 }
4042
4043 /*
4044 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4045 */
4046
4047 if(!acl_set_support && acl_perms) {
4048 mode_t posix_perms;
4049
4050 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4051 free_canon_ace_list(file_ace_list);
4052 free_canon_ace_list(dir_ace_list);
4053 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4054 "posix permissions for file %s.\n",
4055 fsp_str_dbg(fsp)));
4056 return NT_STATUS_ACCESS_DENIED;
4057 }
4058
4059 if (orig_mode != posix_perms) {
4060 int sret = -1;
4061
4062 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4063 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4064
4065 if (set_acl_as_root) {
4066 become_root();
4067 }
4068 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4069 posix_perms);
4070 if (set_acl_as_root) {
4071 unbecome_root();
4072 }
4073 if(sret == -1) {
4074 if (acl_group_override(conn, fsp->fsp_name)) {
4075 DEBUG(5,("set_nt_acl: acl group "
4076 "control on and current user "
4077 "in file %s primary group. "
4078 "Override chmod\n",
4079 fsp_str_dbg(fsp)));
4080
4081 become_root();
4082 sret = SMB_VFS_CHMOD(conn,
4083 fsp->fsp_name->base_name,
4084 posix_perms);
4085 unbecome_root();
4086 }
4087
4088 if (sret == -1) {
4089 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4090 "failed. Error = %s.\n",
4091 fsp_str_dbg(fsp),
4092 (unsigned int)posix_perms,
4093 strerror(errno)));
4094 free_canon_ace_list(file_ace_list);
4095 free_canon_ace_list(dir_ace_list);
4096 return map_nt_error_from_unix(errno);
4097 }
4098 }
4099 }
4100 }
4101
4102 free_canon_ace_list(file_ace_list);
4103 free_canon_ace_list(dir_ace_list);
4104
4105 /* Ensure the stat struct in the fsp is correct. */
4106 status = vfs_stat_fsp(fsp);
4107
4108 return NT_STATUS_OK;
4109 }
4110
4111 /****************************************************************************
4112 Get the actual group bits stored on a file with an ACL. Has no effect if
4113 the file has no ACL. Needed in dosmode code where the stat() will return
4114 the mask bits, not the real group bits, for a file with an ACL.
4115 ****************************************************************************/
4116
4117 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4118 {
4119 int entry_id = SMB_ACL_FIRST_ENTRY;
4120 SMB_ACL_ENTRY_T entry;
4121 SMB_ACL_T posix_acl;
4122 int result = -1;
4123
4124 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4125 if (posix_acl == (SMB_ACL_T)NULL)
4126 return -1;
4127
4128 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4129 SMB_ACL_TAG_T tagtype;
4130 SMB_ACL_PERMSET_T permset;
4131
4132 entry_id = SMB_ACL_NEXT_ENTRY;
4133
4134 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4135 break;
4136
4137 if (tagtype == SMB_ACL_GROUP_OBJ) {
4138 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4139 break;
4140 } else {
4141 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4142 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4143 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4144 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4145 result = 0;
4146 break;
4147 }
4148 }
4149 }
4150 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4151 return result;
4152 }
4153
4154 /****************************************************************************
4155 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4156 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4157 ****************************************************************************/
4158
4159 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4160 {
4161 int entry_id = SMB_ACL_FIRST_ENTRY;
4162 SMB_ACL_ENTRY_T entry;
4163 int num_entries = 0;
4164
4165 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4166 SMB_ACL_TAG_T tagtype;
4167 SMB_ACL_PERMSET_T permset;
4168 mode_t perms;
4169
4170 entry_id = SMB_ACL_NEXT_ENTRY;
4171
4172 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4173 return -1;
4174
4175 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4176 return -1;
4177
4178 num_entries++;
4179
4180 switch(tagtype) {
4181 case SMB_ACL_USER_OBJ:
4182 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4183 break;
4184 case SMB_ACL_GROUP_OBJ:
4185 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4186 break;
4187 case SMB_ACL_MASK:
4188 /*
4189 * FIXME: The ACL_MASK entry permissions should really be set to
4190 * the union of the permissions of all ACL_USER,
4191 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4192 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4193 */
4194 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4195 break;
4196 case SMB_ACL_OTHER:
4197 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4198 break;
4199 default:
4200 continue;
4201 }
4202
4203 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4204 return -1;
4205
4206 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4207 return -1;
4208 }
4209
4210 /*
4211 * If this is a simple 3 element ACL or no elements then it's a standard
4212 * UNIX permission set. Just use chmod...
4213 */
4214
4215 if ((num_entries == 3) || (num_entries == 0))
4216 return -1;
4217
4218 return 0;
4219 }
4220
4221 /****************************************************************************
4222 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4223 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4224 resulting ACL on TO. Note that name is in UNIX character set.
4225 ****************************************************************************/
4226
4227 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4228 {
4229 SMB_ACL_T posix_acl = NULL;
4230 int ret = -1;
4231
4232 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4233 return -1;
4234
4235 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4236 goto done;
4237
4238 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4239
4240 done:
4241
4242 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4243 return ret;
4244 }
4245
4246 /****************************************************************************
4247 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4248 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4249 Note that name is in UNIX character set.
4250 ****************************************************************************/
4251
4252 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4253 {
4254 return copy_access_posix_acl(conn, name, name, mode);
4255 }
4256
4257 /****************************************************************************
4258 Check for an existing default POSIX ACL on a directory.
4259 ****************************************************************************/
4260
4261 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4262 {
4263 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4264 bool has_acl = False;
4265 SMB_ACL_ENTRY_T entry;
4266
4267 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4268 has_acl = True;
4269 }
4270
4271 if (def_acl) {
4272 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4273 }
4274 return has_acl;
4275 }
4276
4277 /****************************************************************************
4278 If the parent directory has no default ACL but it does have an Access ACL,
4279 inherit this Access ACL to file name.
4280 ****************************************************************************/
4281
4282 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4283 const char *name, mode_t mode)
4284 {
4285 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4286 return 0;
4287
4288 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4289 }
4290
4291 /****************************************************************************
4292 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4293 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4294 ****************************************************************************/
4295
4296 int fchmod_acl(files_struct *fsp, mode_t mode)
4297 {
4298 connection_struct *conn = fsp->conn;
4299 SMB_ACL_T posix_acl = NULL;
4300 int ret = -1;
4301
4302 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4303 return -1;
4304
4305 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4306 goto done;
4307
4308 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4309
4310 done:
4311
4312 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4313 return ret;
4314 }
4315
4316 /****************************************************************************
4317 Map from wire type to permset.
4318 ****************************************************************************/
4319
4320 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4321 {
4322 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4323 return False;
4324 }
4325
4326 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4327 return False;
4328 }
4329
4330 if (wire_perm & SMB_POSIX_ACL_READ) {
4331 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4332 return False;
4333 }
4334 }
4335 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4336 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4337 return False;
4338 }
4339 }
4340 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4341 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4342 return False;
4343 }
4344 }
4345 return True;
4346 }
4347
4348 /****************************************************************************
4349 Map from wire type to tagtype.
4350 ****************************************************************************/
4351
4352 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4353 {
4354 switch (wire_tt) {
4355 case SMB_POSIX_ACL_USER_OBJ:
4356 *p_tt = SMB_ACL_USER_OBJ;
4357 break;
4358 case SMB_POSIX_ACL_USER:
4359 *p_tt = SMB_ACL_USER;
4360 break;
4361 case SMB_POSIX_ACL_GROUP_OBJ:
4362 *p_tt = SMB_ACL_GROUP_OBJ;
4363 break;
4364 case SMB_POSIX_ACL_GROUP:
4365 *p_tt = SMB_ACL_GROUP;
4366 break;
4367 case SMB_POSIX_ACL_MASK:
4368 *p_tt = SMB_ACL_MASK;
4369 break;
4370 case SMB_POSIX_ACL_OTHER:
4371 *p_tt = SMB_ACL_OTHER;
4372 break;
4373 default:
4374 return False;
4375 }
4376 return True;
4377 }
4378
4379 /****************************************************************************
4380 Create a new POSIX acl from wire permissions.
4381 FIXME ! How does the share mask/mode fit into this.... ?
4382 ****************************************************************************/
4383
4384 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4385 {
4386 unsigned int i;
4387 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4388
4389 if (the_acl == NULL) {
4390 return NULL;
4391 }
4392
4393 for (i = 0; i < num_acls; i++) {
4394 SMB_ACL_ENTRY_T the_entry;
4395 SMB_ACL_PERMSET_T the_permset;
4396 SMB_ACL_TAG_T tag_type;
4397
4398 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4399 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4400 i, strerror(errno) ));
4401 goto fail;
4402 }
4403
4404 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4405 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4406 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4407 goto fail;
4408 }
4409
4410 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4411 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4412 i, strerror(errno) ));
4413 goto fail;
4414 }
4415
4416 /* Get the permset pointer from the new ACL entry. */
4417 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4418 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4419 i, strerror(errno) ));
4420 goto fail;
4421 }
4422
4423 /* Map from wire to permissions. */
4424 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4425 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4426 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4427 goto fail;
4428 }
4429
4430 /* Now apply to the new ACL entry. */
4431 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4432 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4433 i, strerror(errno) ));
4434 goto fail;
4435 }
4436
4437 if (tag_type == SMB_ACL_USER) {
4438 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4439 uid_t uid = (uid_t)uidval;
4440 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4441 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4442 (unsigned int)uid, i, strerror(errno) ));
4443 goto fail;
4444 }
4445 }
4446
4447 if (tag_type == SMB_ACL_GROUP) {
4448 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4449 gid_t gid = (uid_t)gidval;
4450 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4451 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4452 (unsigned int)gid, i, strerror(errno) ));
4453 goto fail;
4454 }
4455 }
4456 }
4457
4458 return the_acl;
4459
4460 fail:
4461
4462 if (the_acl != NULL) {
4463 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4464 }
4465 return NULL;
4466 }
4467
4468 /****************************************************************************
4469 Calls from UNIX extensions - Default POSIX ACL set.
4470 If num_def_acls == 0 and not a directory just return. If it is a directory
4471 and num_def_acls == 0 then remove the default acl. Else set the default acl
4472 on the directory.
4473 ****************************************************************************/
4474
4475 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4476 uint16 num_def_acls, const char *pdata)
4477 {
4478 SMB_ACL_T def_acl = NULL;
4479
4480 if (!S_ISDIR(psbuf->st_ex_mode)) {
4481 if (num_def_acls) {
4482 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4483 errno = EISDIR;
4484 return False;
4485 } else {
4486 return True;
4487 }
4488 }
4489
4490 if (!num_def_acls) {
4491 /* Remove the default ACL. */
4492 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4493 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4494 fname, strerror(errno) ));
4495 return False;
4496 }
4497 return True;
4498 }
4499
4500 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4501 return False;
4502 }
4503
4504 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4505 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4506 fname, strerror(errno) ));
4507 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4508 return False;
4509 }
4510
4511 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4512 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4513 return True;
4514 }
4515
4516 /****************************************************************************
4517 Remove an ACL from a file. As we don't have acl_delete_entry() available
4518 we must read the current acl and copy all entries except MASK, USER and GROUP
4519 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4520 removed.
4521 FIXME ! How does the share mask/mode fit into this.... ?
4522 ****************************************************************************/
4523
4524 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4525 {
4526 SMB_ACL_T file_acl = NULL;
4527 int entry_id = SMB_ACL_FIRST_ENTRY;
4528 SMB_ACL_ENTRY_T entry;
4529 bool ret = False;
4530 /* Create a new ACL with only 3 entries, u/g/w. */
4531 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4532 SMB_ACL_ENTRY_T user_ent = NULL;
4533 SMB_ACL_ENTRY_T group_ent = NULL;
4534 SMB_ACL_ENTRY_T other_ent = NULL;
4535
4536 if (new_file_acl == NULL) {
4537 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4538 return False;
4539 }
4540
4541 /* Now create the u/g/w entries. */
4542 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4543 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4544 fname, strerror(errno) ));
4545 goto done;
4546 }
4547 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4548 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4549 fname, strerror(errno) ));
4550 goto done;
4551 }
4552
4553 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4554 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4555 fname, strerror(errno) ));
4556 goto done;
4557 }
4558 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4559 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4560 fname, strerror(errno) ));
4561 goto done;
4562 }
4563
4564 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4565 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4566 fname, strerror(errno) ));
4567 goto done;
4568 }
4569 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4570 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4571 fname, strerror(errno) ));
4572 goto done;
4573 }
4574
4575 /* Get the current file ACL. */
4576 if (fsp && fsp->fh->fd != -1) {
4577 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4578 } else {
4579 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4580 }
4581
4582 if (file_acl == NULL) {
4583 /* This is only returned if an error occurred. Even for a file with
4584 no acl a u/g/w acl should be returned. */
4585 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4586 fname, strerror(errno) ));
4587 goto done;
4588 }
4589
4590 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4591 SMB_ACL_TAG_T tagtype;
4592 SMB_ACL_PERMSET_T permset;
4593
4594 entry_id = SMB_ACL_NEXT_ENTRY;
4595
4596 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4597 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4598 fname, strerror(errno) ));
4599 goto done;
4600 }
4601
4602 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4603 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4604 fname, strerror(errno) ));
4605 goto done;
4606 }
4607
4608 if (tagtype == SMB_ACL_USER_OBJ) {
4609 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4610 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4611 fname, strerror(errno) ));
4612 }
4613 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4614 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4615 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4616 fname, strerror(errno) ));
4617 }
4618 } else if (tagtype == SMB_ACL_OTHER) {
4619 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4620 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4621 fname, strerror(errno) ));
4622 }
4623 }
4624 }
4625
4626 /* Set the new empty file ACL. */
4627 if (fsp && fsp->fh->fd != -1) {
4628 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4629 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4630 fname, strerror(errno) ));
4631 goto done;
4632 }
4633 } else {
4634 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4635 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4636 fname, strerror(errno) ));
4637 goto done;
4638 }
4639 }
4640
4641 ret = True;
4642
4643 done:
4644
4645 if (file_acl) {
4646 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4647 }
4648 if (new_file_acl) {
4649 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4650 }
4651 return ret;
4652 }
4653
4654 /****************************************************************************
4655 Calls from UNIX extensions - POSIX ACL set.
4656 If num_def_acls == 0 then read/modify/write acl after removing all entries
4657 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4658 ****************************************************************************/
4659
4660 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4661 {
4662 SMB_ACL_T file_acl = NULL;
4663
4664 if (!num_acls) {
4665 /* Remove the ACL from the file. */
4666 return remove_posix_acl(conn, fsp, fname);
4667 }
4668
4669 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4670 return False;
4671 }
4672
4673 if (fsp && fsp->fh->fd != -1) {
4674 /* The preferred way - use an open fd. */
4675 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4676 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4677 fname, strerror(errno) ));
4678 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4679 return False;
4680 }
4681 } else {
4682 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4683 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4684 fname, strerror(errno) ));
4685 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4686 return False;
4687 }
4688 }
4689
4690 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4691 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4692 return True;
4693 }
4694
4695 /********************************************************************
4696 Pull the NT ACL from a file on disk or the OpenEventlog() access
4697 check. Caller is responsible for freeing the returned security
4698 descriptor via TALLOC_FREE(). This is designed for dealing with
4699 user space access checks in smbd outside of the VFS. For example,
4700 checking access rights in OpenEventlog().
4701
4702 Assume we are dealing with files (for now)
4703 ********************************************************************/
4704
4705 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4706 {
4707 struct security_descriptor *psd, *ret_sd;
4708 connection_struct *conn;
4709 files_struct finfo;
4710 struct fd_handle fh;
4711 NTSTATUS status;
4712
4713 conn = TALLOC_ZERO_P(ctx, connection_struct);
4714 if (conn == NULL) {
4715 DEBUG(0, ("talloc failed\n"));
4716 return NULL;
4717 }
4718
4719 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4720 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4721 TALLOC_FREE(conn);
4722 return NULL;
4723 }
4724
4725 conn->params->service = -1;
4726
4727 set_conn_connectpath(conn, "/");
4728
4729 if (!smbd_vfs_init(conn)) {
4730 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4731 conn_free(conn);
4732 return NULL;
4733 }
4734
4735 ZERO_STRUCT( finfo );
4736 ZERO_STRUCT( fh );
4737
4738 finfo.fnum = -1;
4739 finfo.conn = conn;
4740 finfo.fh = &fh;
4741 finfo.fh->fd = -1;
4742
4743 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4744 &finfo.fsp_name);
4745 if (!NT_STATUS_IS_OK(status)) {
4746 conn_free(conn);
4747 return NULL;
4748 }
4749
4750 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4751 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4752 TALLOC_FREE(finfo.fsp_name);
4753 conn_free(conn);
4754 return NULL;
4755 }
4756
4757 ret_sd = dup_sec_desc( ctx, psd );
4758
4759 TALLOC_FREE(finfo.fsp_name);
4760 conn_free(conn);
4761
4762 return ret_sd;
4763 }
Samba GIT mirror