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s4:torture/rpc/samlogon.c: make use of dcerpc_binding_handle stubs
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobc9fdc714c77858daf973066f2bdb49ea7d385bbb
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 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 SE_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, DOM_SID *powner_sid, 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 SEC_DESC 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 SEC_DESC *psd)
1173 {
1174 DOM_SID owner_sid;
1175 DOM_SID grp_sid;
1176
1177 *puser = (uid_t)-1;
1178 *pgrp = (gid_t)-1;
1179
1180 if(security_info_sent == 0) {
1181 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1182 return NT_STATUS_OK;
1183 }
1184
1185 /*
1186 * Validate the owner and group SID's.
1187 */
1188
1189 memset(&owner_sid, '\0', sizeof(owner_sid));
1190 memset(&grp_sid, '\0', sizeof(grp_sid));
1191
1192 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1193
1194 /*
1195 * Don't immediately fail if the owner sid cannot be validated.
1196 * This may be a group chown only set.
1197 */
1198
1199 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1200 sid_copy(&owner_sid, psd->owner_sid);
1201 if (!sid_to_uid(&owner_sid, puser)) {
1202 if (lp_force_unknown_acl_user(SNUM(conn))) {
1203 /* this allows take ownership to work
1204 * reasonably */
1205 *puser = get_current_uid(conn);
1206 } else {
1207 DEBUG(3,("unpack_nt_owners: unable to validate"
1208 " owner sid for %s\n",
1209 sid_string_dbg(&owner_sid)));
1210 return NT_STATUS_INVALID_OWNER;
1211 }
1212 }
1213 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1214 (unsigned int)*puser ));
1215 }
1216
1217 /*
1218 * Don't immediately fail if the group sid cannot be validated.
1219 * This may be an owner chown only set.
1220 */
1221
1222 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1223 sid_copy(&grp_sid, psd->group_sid);
1224 if (!sid_to_gid( &grp_sid, pgrp)) {
1225 if (lp_force_unknown_acl_user(SNUM(conn))) {
1226 /* this allows take group ownership to work
1227 * reasonably */
1228 *pgrp = get_current_gid(conn);
1229 } else {
1230 DEBUG(3,("unpack_nt_owners: unable to validate"
1231 " group sid.\n"));
1232 return NT_STATUS_INVALID_OWNER;
1233 }
1234 }
1235 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1236 (unsigned int)*pgrp));
1237 }
1238
1239 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1240
1241 return NT_STATUS_OK;
1242 }
1243
1244 /****************************************************************************
1245 Ensure the enforced permissions for this share apply.
1246 ****************************************************************************/
1247
1248 static void apply_default_perms(const struct share_params *params,
1249 const bool is_directory, canon_ace *pace,
1250 mode_t type)
1251 {
1252 mode_t and_bits = (mode_t)0;
1253 mode_t or_bits = (mode_t)0;
1254
1255 /* Get the initial bits to apply. */
1256
1257 if (is_directory) {
1258 and_bits = lp_dir_security_mask(params->service);
1259 or_bits = lp_force_dir_security_mode(params->service);
1260 } else {
1261 and_bits = lp_security_mask(params->service);
1262 or_bits = lp_force_security_mode(params->service);
1263 }
1264
1265 /* Now bounce them into the S_USR space. */
1266 switch(type) {
1267 case S_IRUSR:
1268 /* Ensure owner has read access. */
1269 pace->perms |= S_IRUSR;
1270 if (is_directory)
1271 pace->perms |= (S_IWUSR|S_IXUSR);
1272 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1274 break;
1275 case S_IRGRP:
1276 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1278 break;
1279 case S_IROTH:
1280 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1282 break;
1283 }
1284
1285 pace->perms = ((pace->perms & and_bits)|or_bits);
1286 }
1287
1288 /****************************************************************************
1289 Check if a given uid/SID is in a group gid/SID. This is probably very
1290 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1291 ****************************************************************************/
1292
1293 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1294 {
1295 const char *u_name = NULL;
1296
1297 /* "Everyone" always matches every uid. */
1298
1299 if (sid_equal(&group_ace->trustee, &global_sid_World))
1300 return True;
1301
1302 /*
1303 * if it's the current user, we already have the unix token
1304 * and don't need to do the complex user_in_group_sid() call
1305 */
1306 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1307 const UNIX_USER_TOKEN *curr_utok = NULL;
1308 size_t i;
1309
1310 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1311 return True;
1312 }
1313
1314 curr_utok = get_current_utok(conn);
1315 for (i=0; i < curr_utok->ngroups; i++) {
1316 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1317 return True;
1318 }
1319 }
1320 }
1321
1322 /* u_name talloc'ed off tos. */
1323 u_name = uidtoname(uid_ace->unix_ug.uid);
1324 if (!u_name) {
1325 return False;
1326 }
1327
1328 /*
1329 * user_in_group_sid() uses create_token_from_username()
1330 * which creates an artificial NT token given just a username,
1331 * so this is not reliable for users from foreign domains
1332 * exported by winbindd!
1333 */
1334 return user_in_group_sid(u_name, &group_ace->trustee);
1335 }
1336
1337 /****************************************************************************
1338 A well formed POSIX file or default ACL has at least 3 entries, a
1339 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1340 In addition, the owner must always have at least read access.
1341 When using this call on get_acl, the pst struct is valid and contains
1342 the mode of the file. When using this call on set_acl, the pst struct has
1343 been modified to have a mode containing the default for this file or directory
1344 type.
1345 ****************************************************************************/
1346
1347 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1348 const struct share_params *params,
1349 const bool is_directory,
1350 const DOM_SID *pfile_owner_sid,
1351 const DOM_SID *pfile_grp_sid,
1352 const SMB_STRUCT_STAT *pst,
1353 bool setting_acl)
1354 {
1355 canon_ace *pace;
1356 bool got_user = False;
1357 bool got_grp = False;
1358 bool got_other = False;
1359 canon_ace *pace_other = NULL;
1360
1361 for (pace = *pp_ace; pace; pace = pace->next) {
1362 if (pace->type == SMB_ACL_USER_OBJ) {
1363
1364 if (setting_acl)
1365 apply_default_perms(params, is_directory, pace, S_IRUSR);
1366 got_user = True;
1367
1368 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1369
1370 /*
1371 * Ensure create mask/force create mode is respected on set.
1372 */
1373
1374 if (setting_acl)
1375 apply_default_perms(params, is_directory, pace, S_IRGRP);
1376 got_grp = True;
1377
1378 } else if (pace->type == SMB_ACL_OTHER) {
1379
1380 /*
1381 * Ensure create mask/force create mode is respected on set.
1382 */
1383
1384 if (setting_acl)
1385 apply_default_perms(params, is_directory, pace, S_IROTH);
1386 got_other = True;
1387 pace_other = pace;
1388 }
1389 }
1390
1391 if (!got_user) {
1392 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1393 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1394 return False;
1395 }
1396
1397 ZERO_STRUCTP(pace);
1398 pace->type = SMB_ACL_USER_OBJ;
1399 pace->owner_type = UID_ACE;
1400 pace->unix_ug.uid = pst->st_ex_uid;
1401 pace->trustee = *pfile_owner_sid;
1402 pace->attr = ALLOW_ACE;
1403
1404 if (setting_acl) {
1405 /* See if the owning user is in any of the other groups in
1406 the ACE. If so, OR in the permissions from that group. */
1407
1408 bool group_matched = False;
1409 canon_ace *pace_iter;
1410
1411 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1412 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1413 if (uid_entry_in_group(conn, pace, pace_iter)) {
1414 pace->perms |= pace_iter->perms;
1415 group_matched = True;
1416 }
1417 }
1418 }
1419
1420 /* If we only got an "everyone" perm, just use that. */
1421 if (!group_matched) {
1422 if (got_other)
1423 pace->perms = pace_other->perms;
1424 else
1425 pace->perms = 0;
1426 }
1427
1428 apply_default_perms(params, is_directory, pace, S_IRUSR);
1429 } else {
1430 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1431 }
1432
1433 DLIST_ADD(*pp_ace, pace);
1434 }
1435
1436 if (!got_grp) {
1437 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1438 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1439 return False;
1440 }
1441
1442 ZERO_STRUCTP(pace);
1443 pace->type = SMB_ACL_GROUP_OBJ;
1444 pace->owner_type = GID_ACE;
1445 pace->unix_ug.uid = pst->st_ex_gid;
1446 pace->trustee = *pfile_grp_sid;
1447 pace->attr = ALLOW_ACE;
1448 if (setting_acl) {
1449 /* If we only got an "everyone" perm, just use that. */
1450 if (got_other)
1451 pace->perms = pace_other->perms;
1452 else
1453 pace->perms = 0;
1454 apply_default_perms(params, is_directory, pace, S_IRGRP);
1455 } else {
1456 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1457 }
1458
1459 DLIST_ADD(*pp_ace, pace);
1460 }
1461
1462 if (!got_other) {
1463 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1464 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1465 return False;
1466 }
1467
1468 ZERO_STRUCTP(pace);
1469 pace->type = SMB_ACL_OTHER;
1470 pace->owner_type = WORLD_ACE;
1471 pace->unix_ug.world = -1;
1472 pace->trustee = global_sid_World;
1473 pace->attr = ALLOW_ACE;
1474 if (setting_acl) {
1475 pace->perms = 0;
1476 apply_default_perms(params, is_directory, pace, S_IROTH);
1477 } else
1478 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1479
1480 DLIST_ADD(*pp_ace, pace);
1481 }
1482
1483 return True;
1484 }
1485
1486 /****************************************************************************
1487 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1488 If it does not have them, check if there are any entries where the trustee is the
1489 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1490 ****************************************************************************/
1491
1492 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1493 {
1494 bool got_user_obj, got_group_obj;
1495 canon_ace *current_ace;
1496 int i, entries;
1497
1498 entries = count_canon_ace_list(ace);
1499 got_user_obj = False;
1500 got_group_obj = False;
1501
1502 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1503 if (current_ace->type == SMB_ACL_USER_OBJ)
1504 got_user_obj = True;
1505 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1506 got_group_obj = True;
1507 }
1508 if (got_user_obj && got_group_obj) {
1509 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1510 return;
1511 }
1512
1513 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1514 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1515 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1516 current_ace->type = SMB_ACL_USER_OBJ;
1517 got_user_obj = True;
1518 }
1519 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1520 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1521 current_ace->type = SMB_ACL_GROUP_OBJ;
1522 got_group_obj = True;
1523 }
1524 }
1525 if (!got_user_obj)
1526 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1527 if (!got_group_obj)
1528 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1529 }
1530
1531 /****************************************************************************
1532 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1533 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1534 ****************************************************************************/
1535
1536 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1537 {
1538 /* dir ace must be followings.
1539 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1540 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1541 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1542 Posix ACL u:trustee:perm
1543
1544 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1545 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1546 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1547 Posix ACL g:trustee:perm
1548 */
1549
1550 if (ace->type == SMB_ACL_USER_OBJ &&
1551 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1552 canon_ace *dup_ace = dup_canon_ace(ace);
1553
1554 if (dup_ace == NULL) {
1555 return false;
1556 }
1557 dup_ace->type = SMB_ACL_USER;
1558 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1559 }
1560
1561 if (ace->type == SMB_ACL_GROUP_OBJ &&
1562 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1563 canon_ace *dup_ace = dup_canon_ace(ace);
1564
1565 if (dup_ace == NULL) {
1566 return false;
1567 }
1568 dup_ace->type = SMB_ACL_GROUP;
1569 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1570 }
1571
1572 return true;
1573 }
1574
1575 /****************************************************************************
1576 Unpack a SEC_DESC into two canonical ace lists.
1577 ****************************************************************************/
1578
1579 static bool create_canon_ace_lists(files_struct *fsp,
1580 const SMB_STRUCT_STAT *pst,
1581 DOM_SID *pfile_owner_sid,
1582 DOM_SID *pfile_grp_sid,
1583 canon_ace **ppfile_ace,
1584 canon_ace **ppdir_ace,
1585 const SEC_ACL *dacl)
1586 {
1587 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1588 canon_ace *file_ace = NULL;
1589 canon_ace *dir_ace = NULL;
1590 canon_ace *current_ace = NULL;
1591 bool got_dir_allow = False;
1592 bool got_file_allow = False;
1593 int i, j;
1594
1595 *ppfile_ace = NULL;
1596 *ppdir_ace = NULL;
1597
1598 /*
1599 * Convert the incoming ACL into a more regular form.
1600 */
1601
1602 for(i = 0; i < dacl->num_aces; i++) {
1603 SEC_ACE *psa = &dacl->aces[i];
1604
1605 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1606 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1607 return False;
1608 }
1609
1610 if (nt4_compatible_acls()) {
1611 /*
1612 * The security mask may be UNIX_ACCESS_NONE which should map into
1613 * no permissions (we overload the WRITE_OWNER bit for this) or it
1614 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1615 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1616 */
1617
1618 /*
1619 * Convert GENERIC bits to specific bits.
1620 */
1621
1622 se_map_generic(&psa->access_mask, &file_generic_mapping);
1623
1624 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1625
1626 if(psa->access_mask != UNIX_ACCESS_NONE)
1627 psa->access_mask &= ~UNIX_ACCESS_NONE;
1628 }
1629 }
1630
1631 /*
1632 * Deal with the fact that NT 4.x re-writes the canonical format
1633 * that we return for default ACLs. If a directory ACE is identical
1634 * to a inherited directory ACE then NT changes the bits so that the
1635 * first ACE is set to OI|IO and the second ACE for this SID is set
1636 * to CI. We need to repair this. JRA.
1637 */
1638
1639 for(i = 0; i < dacl->num_aces; i++) {
1640 SEC_ACE *psa1 = &dacl->aces[i];
1641
1642 for (j = i + 1; j < dacl->num_aces; j++) {
1643 SEC_ACE *psa2 = &dacl->aces[j];
1644
1645 if (psa1->access_mask != psa2->access_mask)
1646 continue;
1647
1648 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1649 continue;
1650
1651 /*
1652 * Ok - permission bits and SIDs are equal.
1653 * Check if flags were re-written.
1654 */
1655
1656 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1657
1658 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1659 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1660
1661 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1662
1663 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1664 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1665
1666 }
1667 }
1668 }
1669
1670 for(i = 0; i < dacl->num_aces; i++) {
1671 SEC_ACE *psa = &dacl->aces[i];
1672
1673 /*
1674 * Create a cannon_ace entry representing this NT DACL ACE.
1675 */
1676
1677 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1678 free_canon_ace_list(file_ace);
1679 free_canon_ace_list(dir_ace);
1680 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1681 return False;
1682 }
1683
1684 ZERO_STRUCTP(current_ace);
1685
1686 sid_copy(&current_ace->trustee, &psa->trustee);
1687
1688 /*
1689 * Try and work out if the SID is a user or group
1690 * as we need to flag these differently for POSIX.
1691 * Note what kind of a POSIX ACL this should map to.
1692 */
1693
1694 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1695 current_ace->owner_type = WORLD_ACE;
1696 current_ace->unix_ug.world = -1;
1697 current_ace->type = SMB_ACL_OTHER;
1698 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1699 current_ace->owner_type = UID_ACE;
1700 current_ace->unix_ug.uid = pst->st_ex_uid;
1701 current_ace->type = SMB_ACL_USER_OBJ;
1702
1703 /*
1704 * The Creator Owner entry only specifies inheritable permissions,
1705 * never access permissions. WinNT doesn't always set the ACE to
1706 * INHERIT_ONLY, though.
1707 */
1708
1709 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1710
1711 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1712 current_ace->owner_type = GID_ACE;
1713 current_ace->unix_ug.gid = pst->st_ex_gid;
1714 current_ace->type = SMB_ACL_GROUP_OBJ;
1715
1716 /*
1717 * The Creator Group entry only specifies inheritable permissions,
1718 * never access permissions. WinNT doesn't always set the ACE to
1719 * INHERIT_ONLY, though.
1720 */
1721 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1722
1723 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1724 current_ace->owner_type = UID_ACE;
1725 /* If it's the owning user, this is a user_obj, not
1726 * a user. */
1727 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1728 current_ace->type = SMB_ACL_USER_OBJ;
1729 } else {
1730 current_ace->type = SMB_ACL_USER;
1731 }
1732 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1733 current_ace->owner_type = GID_ACE;
1734 /* If it's the primary group, this is a group_obj, not
1735 * a group. */
1736 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1737 current_ace->type = SMB_ACL_GROUP_OBJ;
1738 } else {
1739 current_ace->type = SMB_ACL_GROUP;
1740 }
1741 } else {
1742 /*
1743 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1744 */
1745
1746 if (non_mappable_sid(&psa->trustee)) {
1747 DEBUG(10, ("create_canon_ace_lists: ignoring "
1748 "non-mappable SID %s\n",
1749 sid_string_dbg(&psa->trustee)));
1750 SAFE_FREE(current_ace);
1751 continue;
1752 }
1753
1754 free_canon_ace_list(file_ace);
1755 free_canon_ace_list(dir_ace);
1756 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1757 "%s to uid or gid.\n",
1758 sid_string_dbg(&current_ace->trustee)));
1759 SAFE_FREE(current_ace);
1760 return False;
1761 }
1762
1763 /*
1764 * Map the given NT permissions into a UNIX mode_t containing only
1765 * S_I(R|W|X)USR bits.
1766 */
1767
1768 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1769 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1770
1771 /* Store the ace_flag. */
1772 current_ace->ace_flags = psa->flags;
1773
1774 /*
1775 * Now add the created ace to either the file list, the directory
1776 * list, or both. We *MUST* preserve the order here (hence we use
1777 * DLIST_ADD_END) as NT ACLs are order dependent.
1778 */
1779
1780 if (fsp->is_directory) {
1781
1782 /*
1783 * We can only add to the default POSIX ACE list if the ACE is
1784 * designed to be inherited by both files and directories.
1785 */
1786
1787 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1788 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1789
1790 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1791
1792 /*
1793 * Note if this was an allow ace. We can't process
1794 * any further deny ace's after this.
1795 */
1796
1797 if (current_ace->attr == ALLOW_ACE)
1798 got_dir_allow = True;
1799
1800 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1801 DEBUG(0,("create_canon_ace_lists: "
1802 "malformed ACL in "
1803 "inheritable ACL! Deny entry "
1804 "after Allow entry. Failing "
1805 "to set on file %s.\n",
1806 fsp_str_dbg(fsp)));
1807 free_canon_ace_list(file_ace);
1808 free_canon_ace_list(dir_ace);
1809 return False;
1810 }
1811
1812 if( DEBUGLVL( 10 )) {
1813 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1814 print_canon_ace( current_ace, 0);
1815 }
1816
1817 /*
1818 * We have a lossy mapping: directory ACE entries
1819 * CREATOR_OWNER ------\
1820 * (map to) +---> SMB_ACL_USER_OBJ
1821 * owning sid ------/
1822 *
1823 * CREATOR_GROUP ------\
1824 * (map to) +---> SMB_ACL_GROUP_OBJ
1825 * primary group sid --/
1826 *
1827 * on set. And on read of a directory ACL
1828 *
1829 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1830 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1831 *
1832 * Deal with this on set by duplicating
1833 * owning sid and primary group sid ACE
1834 * entries into the directory ACL.
1835 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1836 */
1837
1838 if (!dup_owning_ace(dir_ace, current_ace)) {
1839 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1840 free_canon_ace_list(file_ace);
1841 free_canon_ace_list(dir_ace);
1842 return false;
1843 }
1844
1845 /*
1846 * If this is not an inherit only ACE we need to add a duplicate
1847 * to the file acl.
1848 */
1849
1850 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1851 canon_ace *dup_ace = dup_canon_ace(current_ace);
1852
1853 if (!dup_ace) {
1854 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1855 free_canon_ace_list(file_ace);
1856 free_canon_ace_list(dir_ace);
1857 return False;
1858 }
1859
1860 /*
1861 * We must not free current_ace here as its
1862 * pointer is now owned by the dir_ace list.
1863 */
1864 current_ace = dup_ace;
1865 /* We've essentially split this ace into two,
1866 * and added the ace with inheritance request
1867 * bits to the directory ACL. Drop those bits for
1868 * the ACE we're adding to the file list. */
1869 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1870 SEC_ACE_FLAG_CONTAINER_INHERIT|
1871 SEC_ACE_FLAG_INHERIT_ONLY);
1872 } else {
1873 /*
1874 * We must not free current_ace here as its
1875 * pointer is now owned by the dir_ace list.
1876 */
1877 current_ace = NULL;
1878 }
1879 }
1880 }
1881
1882 /*
1883 * Only add to the file ACL if not inherit only.
1884 */
1885
1886 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1887 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1888
1889 /*
1890 * Note if this was an allow ace. We can't process
1891 * any further deny ace's after this.
1892 */
1893
1894 if (current_ace->attr == ALLOW_ACE)
1895 got_file_allow = True;
1896
1897 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1898 DEBUG(0,("create_canon_ace_lists: malformed "
1899 "ACL in file ACL ! Deny entry after "
1900 "Allow entry. Failing to set on file "
1901 "%s.\n", fsp_str_dbg(fsp)));
1902 free_canon_ace_list(file_ace);
1903 free_canon_ace_list(dir_ace);
1904 return False;
1905 }
1906
1907 if( DEBUGLVL( 10 )) {
1908 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1909 print_canon_ace( current_ace, 0);
1910 }
1911 all_aces_are_inherit_only = False;
1912 /*
1913 * We must not free current_ace here as its
1914 * pointer is now owned by the file_ace list.
1915 */
1916 current_ace = NULL;
1917 }
1918
1919 /*
1920 * Free if ACE was not added.
1921 */
1922
1923 SAFE_FREE(current_ace);
1924 }
1925
1926 if (fsp->is_directory && all_aces_are_inherit_only) {
1927 /*
1928 * Windows 2000 is doing one of these weird 'inherit acl'
1929 * traverses to conserve NTFS ACL resources. Just pretend
1930 * there was no DACL sent. JRA.
1931 */
1932
1933 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1934 free_canon_ace_list(file_ace);
1935 free_canon_ace_list(dir_ace);
1936 file_ace = NULL;
1937 dir_ace = NULL;
1938 } else {
1939 /*
1940 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1941 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1942 * entries can be converted to *_OBJ. Usually we will already have these
1943 * entries in the Default ACL, and the Access ACL will not have them.
1944 */
1945 if (file_ace) {
1946 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1947 }
1948 if (dir_ace) {
1949 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1950 }
1951 }
1952
1953 *ppfile_ace = file_ace;
1954 *ppdir_ace = dir_ace;
1955
1956 return True;
1957 }
1958
1959 /****************************************************************************
1960 ASCII art time again... JRA :-).
1961
1962 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1963 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1964 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1965 allow or deny have been merged, so the same SID can only appear once in the deny
1966 list or once in the allow list.
1967
1968 We then process as follows :
1969
1970 ---------------------------------------------------------------------------
1971 First pass - look for a Everyone DENY entry.
1972
1973 If it is deny all (rwx) trunate the list at this point.
1974 Else, walk the list from this point and use the deny permissions of this
1975 entry as a mask on all following allow entries. Finally, delete
1976 the Everyone DENY entry (we have applied it to everything possible).
1977
1978 In addition, in this pass we remove any DENY entries that have
1979 no permissions (ie. they are a DENY nothing).
1980 ---------------------------------------------------------------------------
1981 Second pass - only deal with deny user entries.
1982
1983 DENY user1 (perms XXX)
1984
1985 new_perms = 0
1986 for all following allow group entries where user1 is in group
1987 new_perms |= group_perms;
1988
1989 user1 entry perms = new_perms & ~ XXX;
1990
1991 Convert the deny entry to an allow entry with the new perms and
1992 push to the end of the list. Note if the user was in no groups
1993 this maps to a specific allow nothing entry for this user.
1994
1995 The common case from the NT ACL choser (userX deny all) is
1996 optimised so we don't do the group lookup - we just map to
1997 an allow nothing entry.
1998
1999 What we're doing here is inferring the allow permissions the
2000 person setting the ACE on user1 wanted by looking at the allow
2001 permissions on the groups the user is currently in. This will
2002 be a snapshot, depending on group membership but is the best
2003 we can do and has the advantage of failing closed rather than
2004 open.
2005 ---------------------------------------------------------------------------
2006 Third pass - only deal with deny group entries.
2007
2008 DENY group1 (perms XXX)
2009
2010 for all following allow user entries where user is in group1
2011 user entry perms = user entry perms & ~ XXX;
2012
2013 If there is a group Everyone allow entry with permissions YYY,
2014 convert the group1 entry to an allow entry and modify its
2015 permissions to be :
2016
2017 new_perms = YYY & ~ XXX
2018
2019 and push to the end of the list.
2020
2021 If there is no group Everyone allow entry then convert the
2022 group1 entry to a allow nothing entry and push to the end of the list.
2023
2024 Note that the common case from the NT ACL choser (groupX deny all)
2025 cannot be optimised here as we need to modify user entries who are
2026 in the group to change them to a deny all also.
2027
2028 What we're doing here is modifying the allow permissions of
2029 user entries (which are more specific in POSIX ACLs) to mask
2030 out the explicit deny set on the group they are in. This will
2031 be a snapshot depending on current group membership but is the
2032 best we can do and has the advantage of failing closed rather
2033 than open.
2034 ---------------------------------------------------------------------------
2035 Fourth pass - cope with cumulative permissions.
2036
2037 for all allow user entries, if there exists an allow group entry with
2038 more permissive permissions, and the user is in that group, rewrite the
2039 allow user permissions to contain both sets of permissions.
2040
2041 Currently the code for this is #ifdef'ed out as these semantics make
2042 no sense to me. JRA.
2043 ---------------------------------------------------------------------------
2044
2045 Note we *MUST* do the deny user pass first as this will convert deny user
2046 entries into allow user entries which can then be processed by the deny
2047 group pass.
2048
2049 The above algorithm took a *lot* of thinking about - hence this
2050 explaination :-). JRA.
2051 ****************************************************************************/
2052
2053 /****************************************************************************
2054 Process a canon_ace list entries. This is very complex code. We need
2055 to go through and remove the "deny" permissions from any allow entry that matches
2056 the id of this entry. We have already refused any NT ACL that wasn't in correct
2057 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2058 we just remove it (to fail safe). We have already removed any duplicate ace
2059 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2060 allow entries.
2061 ****************************************************************************/
2062
2063 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2064 {
2065 canon_ace *ace_list = *pp_ace_list;
2066 canon_ace *curr_ace = NULL;
2067 canon_ace *curr_ace_next = NULL;
2068
2069 /* Pass 1 above - look for an Everyone, deny entry. */
2070
2071 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2072 canon_ace *allow_ace_p;
2073
2074 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2075
2076 if (curr_ace->attr != DENY_ACE)
2077 continue;
2078
2079 if (curr_ace->perms == (mode_t)0) {
2080
2081 /* Deny nothing entry - delete. */
2082
2083 DLIST_REMOVE(ace_list, curr_ace);
2084 continue;
2085 }
2086
2087 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2088 continue;
2089
2090 /* JRATEST - assert. */
2091 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2092
2093 if (curr_ace->perms == ALL_ACE_PERMS) {
2094
2095 /*
2096 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2097 * list at this point including this entry.
2098 */
2099
2100 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2101
2102 free_canon_ace_list( curr_ace );
2103 if (prev_entry)
2104 DLIST_REMOVE(ace_list, prev_entry);
2105 else {
2106 /* We deleted the entire list. */
2107 ace_list = NULL;
2108 }
2109 break;
2110 }
2111
2112 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2113
2114 /*
2115 * Only mask off allow entries.
2116 */
2117
2118 if (allow_ace_p->attr != ALLOW_ACE)
2119 continue;
2120
2121 allow_ace_p->perms &= ~curr_ace->perms;
2122 }
2123
2124 /*
2125 * Now it's been applied, remove it.
2126 */
2127
2128 DLIST_REMOVE(ace_list, curr_ace);
2129 }
2130
2131 /* Pass 2 above - deal with deny user entries. */
2132
2133 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2134 mode_t new_perms = (mode_t)0;
2135 canon_ace *allow_ace_p;
2136
2137 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2138
2139 if (curr_ace->attr != DENY_ACE)
2140 continue;
2141
2142 if (curr_ace->owner_type != UID_ACE)
2143 continue;
2144
2145 if (curr_ace->perms == ALL_ACE_PERMS) {
2146
2147 /*
2148 * Optimisation - this is a deny everything to this user.
2149 * Convert to an allow nothing and push to the end of the list.
2150 */
2151
2152 curr_ace->attr = ALLOW_ACE;
2153 curr_ace->perms = (mode_t)0;
2154 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2155 continue;
2156 }
2157
2158 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2159
2160 if (allow_ace_p->attr != ALLOW_ACE)
2161 continue;
2162
2163 /* We process GID_ACE and WORLD_ACE entries only. */
2164
2165 if (allow_ace_p->owner_type == UID_ACE)
2166 continue;
2167
2168 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2169 new_perms |= allow_ace_p->perms;
2170 }
2171
2172 /*
2173 * Convert to a allow entry, modify the perms and push to the end
2174 * of the list.
2175 */
2176
2177 curr_ace->attr = ALLOW_ACE;
2178 curr_ace->perms = (new_perms & ~curr_ace->perms);
2179 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2180 }
2181
2182 /* Pass 3 above - deal with deny group entries. */
2183
2184 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2185 canon_ace *allow_ace_p;
2186 canon_ace *allow_everyone_p = NULL;
2187
2188 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2189
2190 if (curr_ace->attr != DENY_ACE)
2191 continue;
2192
2193 if (curr_ace->owner_type != GID_ACE)
2194 continue;
2195
2196 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2197
2198 if (allow_ace_p->attr != ALLOW_ACE)
2199 continue;
2200
2201 /* Store a pointer to the Everyone allow, if it exists. */
2202 if (allow_ace_p->owner_type == WORLD_ACE)
2203 allow_everyone_p = allow_ace_p;
2204
2205 /* We process UID_ACE entries only. */
2206
2207 if (allow_ace_p->owner_type != UID_ACE)
2208 continue;
2209
2210 /* Mask off the deny group perms. */
2211
2212 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2213 allow_ace_p->perms &= ~curr_ace->perms;
2214 }
2215
2216 /*
2217 * Convert the deny to an allow with the correct perms and
2218 * push to the end of the list.
2219 */
2220
2221 curr_ace->attr = ALLOW_ACE;
2222 if (allow_everyone_p)
2223 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2224 else
2225 curr_ace->perms = (mode_t)0;
2226 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2227 }
2228
2229 /* Doing this fourth pass allows Windows semantics to be layered
2230 * on top of POSIX semantics. I'm not sure if this is desirable.
2231 * For example, in W2K ACLs there is no way to say, "Group X no
2232 * access, user Y full access" if user Y is a member of group X.
2233 * This seems completely broken semantics to me.... JRA.
2234 */
2235
2236 #if 0
2237 /* Pass 4 above - deal with allow entries. */
2238
2239 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2240 canon_ace *allow_ace_p;
2241
2242 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2243
2244 if (curr_ace->attr != ALLOW_ACE)
2245 continue;
2246
2247 if (curr_ace->owner_type != UID_ACE)
2248 continue;
2249
2250 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2251
2252 if (allow_ace_p->attr != ALLOW_ACE)
2253 continue;
2254
2255 /* We process GID_ACE entries only. */
2256
2257 if (allow_ace_p->owner_type != GID_ACE)
2258 continue;
2259
2260 /* OR in the group perms. */
2261
2262 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2263 curr_ace->perms |= allow_ace_p->perms;
2264 }
2265 }
2266 #endif
2267
2268 *pp_ace_list = ace_list;
2269 }
2270
2271 /****************************************************************************
2272 Create a default mode that will be used if a security descriptor entry has
2273 no user/group/world entries.
2274 ****************************************************************************/
2275
2276 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2277 {
2278 int snum = SNUM(fsp->conn);
2279 mode_t and_bits = (mode_t)0;
2280 mode_t or_bits = (mode_t)0;
2281 mode_t mode;
2282
2283 if (interitable_mode) {
2284 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2285 fsp->fsp_name, NULL);
2286 } else {
2287 mode = S_IRUSR;
2288 }
2289
2290 if (fsp->is_directory)
2291 mode |= (S_IWUSR|S_IXUSR);
2292
2293 /*
2294 * Now AND with the create mode/directory mode bits then OR with the
2295 * force create mode/force directory mode bits.
2296 */
2297
2298 if (fsp->is_directory) {
2299 and_bits = lp_dir_security_mask(snum);
2300 or_bits = lp_force_dir_security_mode(snum);
2301 } else {
2302 and_bits = lp_security_mask(snum);
2303 or_bits = lp_force_security_mode(snum);
2304 }
2305
2306 return ((mode & and_bits)|or_bits);
2307 }
2308
2309 /****************************************************************************
2310 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2311 succeeding.
2312 ****************************************************************************/
2313
2314 static bool unpack_canon_ace(files_struct *fsp,
2315 const SMB_STRUCT_STAT *pst,
2316 DOM_SID *pfile_owner_sid,
2317 DOM_SID *pfile_grp_sid,
2318 canon_ace **ppfile_ace,
2319 canon_ace **ppdir_ace,
2320 uint32 security_info_sent,
2321 const SEC_DESC *psd)
2322 {
2323 SMB_STRUCT_STAT st;
2324 canon_ace *file_ace = NULL;
2325 canon_ace *dir_ace = NULL;
2326
2327 *ppfile_ace = NULL;
2328 *ppdir_ace = NULL;
2329
2330 if(security_info_sent == 0) {
2331 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2332 return False;
2333 }
2334
2335 /*
2336 * If no DACL then this is a chown only security descriptor.
2337 */
2338
2339 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2340 return True;
2341
2342 /*
2343 * Now go through the DACL and create the canon_ace lists.
2344 */
2345
2346 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2347 &file_ace, &dir_ace, psd->dacl))
2348 return False;
2349
2350 if ((file_ace == NULL) && (dir_ace == NULL)) {
2351 /* W2K traverse DACL set - ignore. */
2352 return True;
2353 }
2354
2355 /*
2356 * Go through the canon_ace list and merge entries
2357 * belonging to identical users of identical allow or deny type.
2358 * We can do this as all deny entries come first, followed by
2359 * all allow entries (we have mandated this before accepting this acl).
2360 */
2361
2362 print_canon_ace_list( "file ace - before merge", file_ace);
2363 merge_aces( &file_ace, false);
2364
2365 print_canon_ace_list( "dir ace - before merge", dir_ace);
2366 merge_aces( &dir_ace, true);
2367
2368 /*
2369 * NT ACLs are order dependent. Go through the acl lists and
2370 * process DENY entries by masking the allow entries.
2371 */
2372
2373 print_canon_ace_list( "file ace - before deny", file_ace);
2374 process_deny_list(fsp->conn, &file_ace);
2375
2376 print_canon_ace_list( "dir ace - before deny", dir_ace);
2377 process_deny_list(fsp->conn, &dir_ace);
2378
2379 /*
2380 * A well formed POSIX file or default ACL has at least 3 entries, a
2381 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2382 * and optionally a mask entry. Ensure this is the case.
2383 */
2384
2385 print_canon_ace_list( "file ace - before valid", file_ace);
2386
2387 st = *pst;
2388
2389 /*
2390 * A default 3 element mode entry for a file should be r-- --- ---.
2391 * A default 3 element mode entry for a directory should be rwx --- ---.
2392 */
2393
2394 st.st_ex_mode = create_default_mode(fsp, False);
2395
2396 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2397 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2398 free_canon_ace_list(file_ace);
2399 free_canon_ace_list(dir_ace);
2400 return False;
2401 }
2402
2403 print_canon_ace_list( "dir ace - before valid", dir_ace);
2404
2405 /*
2406 * A default inheritable 3 element mode entry for a directory should be the
2407 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2408 * it's a directory.
2409 */
2410
2411 st.st_ex_mode = create_default_mode(fsp, True);
2412
2413 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2414 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2415 free_canon_ace_list(file_ace);
2416 free_canon_ace_list(dir_ace);
2417 return False;
2418 }
2419
2420 print_canon_ace_list( "file ace - return", file_ace);
2421 print_canon_ace_list( "dir ace - return", dir_ace);
2422
2423 *ppfile_ace = file_ace;
2424 *ppdir_ace = dir_ace;
2425 return True;
2426
2427 }
2428
2429 /******************************************************************************
2430 When returning permissions, try and fit NT display
2431 semantics if possible. Note the the canon_entries here must have been malloced.
2432 The list format should be - first entry = owner, followed by group and other user
2433 entries, last entry = other.
2434
2435 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2436 are not ordered, and match on the most specific entry rather than walking a list,
2437 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2438
2439 Entry 0: owner : deny all except read and write.
2440 Entry 1: owner : allow read and write.
2441 Entry 2: group : deny all except read.
2442 Entry 3: group : allow read.
2443 Entry 4: Everyone : allow read.
2444
2445 But NT cannot display this in their ACL editor !
2446 ********************************************************************************/
2447
2448 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2449 {
2450 canon_ace *l_head = *pp_list_head;
2451 canon_ace *owner_ace = NULL;
2452 canon_ace *other_ace = NULL;
2453 canon_ace *ace = NULL;
2454
2455 for (ace = l_head; ace; ace = ace->next) {
2456 if (ace->type == SMB_ACL_USER_OBJ)
2457 owner_ace = ace;
2458 else if (ace->type == SMB_ACL_OTHER) {
2459 /* Last ace - this is "other" */
2460 other_ace = ace;
2461 }
2462 }
2463
2464 if (!owner_ace || !other_ace) {
2465 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2466 filename ));
2467 return;
2468 }
2469
2470 /*
2471 * The POSIX algorithm applies to owner first, and other last,
2472 * so ensure they are arranged in this order.
2473 */
2474
2475 if (owner_ace) {
2476 DLIST_PROMOTE(l_head, owner_ace);
2477 }
2478
2479 if (other_ace) {
2480 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2481 }
2482
2483 /* We have probably changed the head of the list. */
2484
2485 *pp_list_head = l_head;
2486 }
2487
2488 /****************************************************************************
2489 Create a linked list of canonical ACE entries.
2490 ****************************************************************************/
2491
2492 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2493 const char *fname, SMB_ACL_T posix_acl,
2494 const SMB_STRUCT_STAT *psbuf,
2495 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2496 {
2497 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2498 canon_ace *l_head = NULL;
2499 canon_ace *ace = NULL;
2500 canon_ace *next_ace = NULL;
2501 int entry_id = SMB_ACL_FIRST_ENTRY;
2502 SMB_ACL_ENTRY_T entry;
2503 size_t ace_count;
2504
2505 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2506 SMB_ACL_TAG_T tagtype;
2507 SMB_ACL_PERMSET_T permset;
2508 DOM_SID sid;
2509 posix_id unix_ug;
2510 enum ace_owner owner_type;
2511
2512 entry_id = SMB_ACL_NEXT_ENTRY;
2513
2514 /* Is this a MASK entry ? */
2515 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2516 continue;
2517
2518 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2519 continue;
2520
2521 /* Decide which SID to use based on the ACL type. */
2522 switch(tagtype) {
2523 case SMB_ACL_USER_OBJ:
2524 /* Get the SID from the owner. */
2525 sid_copy(&sid, powner);
2526 unix_ug.uid = psbuf->st_ex_uid;
2527 owner_type = UID_ACE;
2528 break;
2529 case SMB_ACL_USER:
2530 {
2531 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2532 if (puid == NULL) {
2533 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2534 continue;
2535 }
2536 uid_to_sid( &sid, *puid);
2537 unix_ug.uid = *puid;
2538 owner_type = UID_ACE;
2539 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2540 break;
2541 }
2542 case SMB_ACL_GROUP_OBJ:
2543 /* Get the SID from the owning group. */
2544 sid_copy(&sid, pgroup);
2545 unix_ug.gid = psbuf->st_ex_gid;
2546 owner_type = GID_ACE;
2547 break;
2548 case SMB_ACL_GROUP:
2549 {
2550 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2551 if (pgid == NULL) {
2552 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2553 continue;
2554 }
2555 gid_to_sid( &sid, *pgid);
2556 unix_ug.gid = *pgid;
2557 owner_type = GID_ACE;
2558 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2559 break;
2560 }
2561 case SMB_ACL_MASK:
2562 acl_mask = convert_permset_to_mode_t(conn, permset);
2563 continue; /* Don't count the mask as an entry. */
2564 case SMB_ACL_OTHER:
2565 /* Use the Everyone SID */
2566 sid = global_sid_World;
2567 unix_ug.world = -1;
2568 owner_type = WORLD_ACE;
2569 break;
2570 default:
2571 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2572 continue;
2573 }
2574
2575 /*
2576 * Add this entry to the list.
2577 */
2578
2579 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2580 goto fail;
2581
2582 ZERO_STRUCTP(ace);
2583 ace->type = tagtype;
2584 ace->perms = convert_permset_to_mode_t(conn, permset);
2585 ace->attr = ALLOW_ACE;
2586 ace->trustee = sid;
2587 ace->unix_ug = unix_ug;
2588 ace->owner_type = owner_type;
2589 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2590
2591 DLIST_ADD(l_head, ace);
2592 }
2593
2594 /*
2595 * This next call will ensure we have at least a user/group/world set.
2596 */
2597
2598 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2599 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2600 psbuf, False))
2601 goto fail;
2602
2603 /*
2604 * Now go through the list, masking the permissions with the
2605 * acl_mask. Ensure all DENY Entries are at the start of the list.
2606 */
2607
2608 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2609
2610 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2611 next_ace = ace->next;
2612
2613 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2614 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2615 ace->perms &= acl_mask;
2616
2617 if (ace->perms == 0) {
2618 DLIST_PROMOTE(l_head, ace);
2619 }
2620
2621 if( DEBUGLVL( 10 ) ) {
2622 print_canon_ace(ace, ace_count);
2623 }
2624 }
2625
2626 arrange_posix_perms(fname,&l_head );
2627
2628 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2629
2630 return l_head;
2631
2632 fail:
2633
2634 free_canon_ace_list(l_head);
2635 return NULL;
2636 }
2637
2638 /****************************************************************************
2639 Check if the current user group list contains a given group.
2640 ****************************************************************************/
2641
2642 static bool current_user_in_group(connection_struct *conn, gid_t gid)
2643 {
2644 int i;
2645 const UNIX_USER_TOKEN *utok = get_current_utok(conn);
2646
2647 for (i = 0; i < utok->ngroups; i++) {
2648 if (utok->groups[i] == gid) {
2649 return True;
2650 }
2651 }
2652
2653 return False;
2654 }
2655
2656 /****************************************************************************
2657 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2658 ****************************************************************************/
2659
2660 static bool acl_group_override(connection_struct *conn,
2661 const struct smb_filename *smb_fname)
2662 {
2663 if ((errno != EPERM) && (errno != EACCES)) {
2664 return false;
2665 }
2666
2667 /* file primary group == user primary or supplementary group */
2668 if (lp_acl_group_control(SNUM(conn)) &&
2669 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2670 return true;
2671 }
2672
2673 /* user has writeable permission */
2674 if (lp_dos_filemode(SNUM(conn)) &&
2675 can_write_to_file(conn, smb_fname)) {
2676 return true;
2677 }
2678
2679 return false;
2680 }
2681
2682 /****************************************************************************
2683 Attempt to apply an ACL to a file or directory.
2684 ****************************************************************************/
2685
2686 static bool set_canon_ace_list(files_struct *fsp,
2687 canon_ace *the_ace,
2688 bool default_ace,
2689 const SMB_STRUCT_STAT *psbuf,
2690 bool *pacl_set_support)
2691 {
2692 connection_struct *conn = fsp->conn;
2693 bool ret = False;
2694 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2695 canon_ace *p_ace;
2696 int i;
2697 SMB_ACL_ENTRY_T mask_entry;
2698 bool got_mask_entry = False;
2699 SMB_ACL_PERMSET_T mask_permset;
2700 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2701 bool needs_mask = False;
2702 mode_t mask_perms = 0;
2703
2704 /* Use the psbuf that was passed in. */
2705 fsp->fsp_name->st = *psbuf;
2706
2707 #if defined(POSIX_ACL_NEEDS_MASK)
2708 /* HP-UX always wants to have a mask (called "class" there). */
2709 needs_mask = True;
2710 #endif
2711
2712 if (the_acl == NULL) {
2713
2714 if (!no_acl_syscall_error(errno)) {
2715 /*
2716 * Only print this error message if we have some kind of ACL
2717 * support that's not working. Otherwise we would always get this.
2718 */
2719 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2720 default_ace ? "default" : "file", strerror(errno) ));
2721 }
2722 *pacl_set_support = False;
2723 goto fail;
2724 }
2725
2726 if( DEBUGLVL( 10 )) {
2727 dbgtext("set_canon_ace_list: setting ACL:\n");
2728 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2729 print_canon_ace( p_ace, i);
2730 }
2731 }
2732
2733 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2734 SMB_ACL_ENTRY_T the_entry;
2735 SMB_ACL_PERMSET_T the_permset;
2736
2737 /*
2738 * ACLs only "need" an ACL_MASK entry if there are any named user or
2739 * named group entries. But if there is an ACL_MASK entry, it applies
2740 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2741 * so that it doesn't deny (i.e., mask off) any permissions.
2742 */
2743
2744 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2745 needs_mask = True;
2746 mask_perms |= p_ace->perms;
2747 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2748 mask_perms |= p_ace->perms;
2749 }
2750
2751 /*
2752 * Get the entry for this ACE.
2753 */
2754
2755 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2756 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2757 i, strerror(errno) ));
2758 goto fail;
2759 }
2760
2761 if (p_ace->type == SMB_ACL_MASK) {
2762 mask_entry = the_entry;
2763 got_mask_entry = True;
2764 }
2765
2766 /*
2767 * Ok - we now know the ACL calls should be working, don't
2768 * allow fallback to chmod.
2769 */
2770
2771 *pacl_set_support = True;
2772
2773 /*
2774 * Initialise the entry from the canon_ace.
2775 */
2776
2777 /*
2778 * First tell the entry what type of ACE this is.
2779 */
2780
2781 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2782 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2783 i, strerror(errno) ));
2784 goto fail;
2785 }
2786
2787 /*
2788 * Only set the qualifier (user or group id) if the entry is a user
2789 * or group id ACE.
2790 */
2791
2792 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2793 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2794 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2795 i, strerror(errno) ));
2796 goto fail;
2797 }
2798 }
2799
2800 /*
2801 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2802 */
2803
2804 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2805 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2806 i, strerror(errno) ));
2807 goto fail;
2808 }
2809
2810 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2811 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2812 (unsigned int)p_ace->perms, i, strerror(errno) ));
2813 goto fail;
2814 }
2815
2816 /*
2817 * ..and apply them to the entry.
2818 */
2819
2820 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2821 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2822 i, strerror(errno) ));
2823 goto fail;
2824 }
2825
2826 if( DEBUGLVL( 10 ))
2827 print_canon_ace( p_ace, i);
2828
2829 }
2830
2831 if (needs_mask && !got_mask_entry) {
2832 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2833 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2834 goto fail;
2835 }
2836
2837 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2838 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2839 goto fail;
2840 }
2841
2842 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2843 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2844 goto fail;
2845 }
2846
2847 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2848 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2849 goto fail;
2850 }
2851
2852 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2853 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2854 goto fail;
2855 }
2856 }
2857
2858 /*
2859 * Finally apply it to the file or directory.
2860 */
2861
2862 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2863 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2864 the_acl_type, the_acl) == -1) {
2865 /*
2866 * Some systems allow all the above calls and only fail with no ACL support
2867 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2868 */
2869 if (no_acl_syscall_error(errno)) {
2870 *pacl_set_support = False;
2871 }
2872
2873 if (acl_group_override(conn, fsp->fsp_name)) {
2874 int sret;
2875
2876 DEBUG(5,("set_canon_ace_list: acl group "
2877 "control on and current user in file "
2878 "%s primary group.\n",
2879 fsp_str_dbg(fsp)));
2880
2881 become_root();
2882 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2883 fsp->fsp_name->base_name, the_acl_type,
2884 the_acl);
2885 unbecome_root();
2886 if (sret == 0) {
2887 ret = True;
2888 }
2889 }
2890
2891 if (ret == False) {
2892 DEBUG(2,("set_canon_ace_list: "
2893 "sys_acl_set_file type %s failed for "
2894 "file %s (%s).\n",
2895 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2896 "directory default" : "file",
2897 fsp_str_dbg(fsp), strerror(errno)));
2898 goto fail;
2899 }
2900 }
2901 } else {
2902 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2903 /*
2904 * Some systems allow all the above calls and only fail with no ACL support
2905 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2906 */
2907 if (no_acl_syscall_error(errno)) {
2908 *pacl_set_support = False;
2909 }
2910
2911 if (acl_group_override(conn, fsp->fsp_name)) {
2912 int sret;
2913
2914 DEBUG(5,("set_canon_ace_list: acl group "
2915 "control on and current user in file "
2916 "%s primary group.\n",
2917 fsp_str_dbg(fsp)));
2918
2919 become_root();
2920 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2921 unbecome_root();
2922 if (sret == 0) {
2923 ret = True;
2924 }
2925 }
2926
2927 if (ret == False) {
2928 DEBUG(2,("set_canon_ace_list: "
2929 "sys_acl_set_file failed for file %s "
2930 "(%s).\n",
2931 fsp_str_dbg(fsp), strerror(errno)));
2932 goto fail;
2933 }
2934 }
2935 }
2936
2937 ret = True;
2938
2939 fail:
2940
2941 if (the_acl != NULL) {
2942 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2943 }
2944
2945 return ret;
2946 }
2947
2948 /****************************************************************************
2949 Find a particular canon_ace entry.
2950 ****************************************************************************/
2951
2952 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2953 {
2954 while (list) {
2955 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2956 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2957 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2958 break;
2959 list = list->next;
2960 }
2961 return list;
2962 }
2963
2964 /****************************************************************************
2965
2966 ****************************************************************************/
2967
2968 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2969 {
2970 SMB_ACL_ENTRY_T entry;
2971
2972 if (!the_acl)
2973 return NULL;
2974 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2975 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2976 return NULL;
2977 }
2978 return the_acl;
2979 }
2980
2981 /****************************************************************************
2982 Convert a canon_ace to a generic 3 element permission - if possible.
2983 ****************************************************************************/
2984
2985 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2986
2987 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2988 {
2989 int snum = SNUM(fsp->conn);
2990 size_t ace_count = count_canon_ace_list(file_ace_list);
2991 canon_ace *ace_p;
2992 canon_ace *owner_ace = NULL;
2993 canon_ace *group_ace = NULL;
2994 canon_ace *other_ace = NULL;
2995 mode_t and_bits;
2996 mode_t or_bits;
2997
2998 if (ace_count != 3) {
2999 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3000 "entries for file %s to convert to posix perms.\n",
3001 fsp_str_dbg(fsp)));
3002 return False;
3003 }
3004
3005 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3006 if (ace_p->owner_type == UID_ACE)
3007 owner_ace = ace_p;
3008 else if (ace_p->owner_type == GID_ACE)
3009 group_ace = ace_p;
3010 else if (ace_p->owner_type == WORLD_ACE)
3011 other_ace = ace_p;
3012 }
3013
3014 if (!owner_ace || !group_ace || !other_ace) {
3015 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3016 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3017 return False;
3018 }
3019
3020 *posix_perms = (mode_t)0;
3021
3022 *posix_perms |= owner_ace->perms;
3023 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3024 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3025 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3026 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3027 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3028 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3029
3030 /* The owner must have at least read access. */
3031
3032 *posix_perms |= S_IRUSR;
3033 if (fsp->is_directory)
3034 *posix_perms |= (S_IWUSR|S_IXUSR);
3035
3036 /* If requested apply the masks. */
3037
3038 /* Get the initial bits to apply. */
3039
3040 if (fsp->is_directory) {
3041 and_bits = lp_dir_security_mask(snum);
3042 or_bits = lp_force_dir_security_mode(snum);
3043 } else {
3044 and_bits = lp_security_mask(snum);
3045 or_bits = lp_force_security_mode(snum);
3046 }
3047
3048 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3049
3050 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3051 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3052 (int)group_ace->perms, (int)other_ace->perms,
3053 (int)*posix_perms, fsp_str_dbg(fsp)));
3054
3055 return True;
3056 }
3057
3058 /****************************************************************************
3059 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3060 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3061 with CI|OI set so it is inherited and also applies to the directory.
3062 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3063 ****************************************************************************/
3064
3065 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3066 {
3067 size_t i, j;
3068
3069 for (i = 0; i < num_aces; i++) {
3070 for (j = i+1; j < num_aces; j++) {
3071 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3072 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3073 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3074 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3075
3076 /* We know the lower number ACE's are file entries. */
3077 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3078 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3079 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3080 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3081 (i_inh == j_inh) &&
3082 (i_flags_ni == 0) &&
3083 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3084 SEC_ACE_FLAG_CONTAINER_INHERIT|
3085 SEC_ACE_FLAG_INHERIT_ONLY))) {
3086 /*
3087 * W2K wants to have access allowed zero access ACE's
3088 * at the end of the list. If the mask is zero, merge
3089 * the non-inherited ACE onto the inherited ACE.
3090 */
3091
3092 if (nt_ace_list[i].access_mask == 0) {
3093 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3094 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3095 if (num_aces - i - 1 > 0)
3096 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3097 sizeof(SEC_ACE));
3098
3099 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3100 (unsigned int)i, (unsigned int)j ));
3101 } else {
3102 /*
3103 * These are identical except for the flags.
3104 * Merge the inherited ACE onto the non-inherited ACE.
3105 */
3106
3107 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3108 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3109 if (num_aces - j - 1 > 0)
3110 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3111 sizeof(SEC_ACE));
3112
3113 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3114 (unsigned int)j, (unsigned int)i ));
3115 }
3116 num_aces--;
3117 break;
3118 }
3119 }
3120 }
3121
3122 return num_aces;
3123 }
3124
3125 /*
3126 * Add or Replace ACE entry.
3127 * In some cases we need to add a specific ACE for compatibility reasons.
3128 * When doing that we must make sure we are not actually creating a duplicate
3129 * entry. So we need to search whether an ACE entry already exist and eventually
3130 * replacce the access mask, or add a completely new entry if none was found.
3131 *
3132 * This function assumes the array has enough space to add a new entry without
3133 * any reallocation of memory.
3134 */
3135
3136 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
3137 const DOM_SID *sid, enum security_ace_type type,
3138 uint32_t mask, uint8_t flags)
3139 {
3140 int i;
3141
3142 /* first search for a duplicate */
3143 for (i = 0; i < *num_aces; i++) {
3144 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3145 (nt_ace_list[i].flags == flags)) break;
3146 }
3147
3148 if (i < *num_aces) { /* found */
3149 nt_ace_list[i].type = type;
3150 nt_ace_list[i].access_mask = mask;
3151 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3152 i, sid_string_dbg(sid), flags));
3153 return;
3154 }
3155
3156 /* not found, append it */
3157 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3158 }
3159
3160
3161 /****************************************************************************
3162 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3163 the space for the return elements and returns the size needed to return the
3164 security descriptor. This should be the only external function needed for
3165 the UNIX style get ACL.
3166 ****************************************************************************/
3167
3168 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3169 const char *name,
3170 const SMB_STRUCT_STAT *sbuf,
3171 struct pai_val *pal,
3172 SMB_ACL_T posix_acl,
3173 SMB_ACL_T def_acl,
3174 uint32_t security_info,
3175 SEC_DESC **ppdesc)
3176 {
3177 DOM_SID owner_sid;
3178 DOM_SID group_sid;
3179 size_t sd_size = 0;
3180 SEC_ACL *psa = NULL;
3181 size_t num_acls = 0;
3182 size_t num_def_acls = 0;
3183 size_t num_aces = 0;
3184 canon_ace *file_ace = NULL;
3185 canon_ace *dir_ace = NULL;
3186 SEC_ACE *nt_ace_list = NULL;
3187 size_t num_profile_acls = 0;
3188 DOM_SID orig_owner_sid;
3189 SEC_DESC *psd = NULL;
3190 int i;
3191
3192 /*
3193 * Get the owner, group and world SIDs.
3194 */
3195
3196 create_file_sids(sbuf, &owner_sid, &group_sid);
3197
3198 if (lp_profile_acls(SNUM(conn))) {
3199 /* For WXP SP1 the owner must be administrators. */
3200 sid_copy(&orig_owner_sid, &owner_sid);
3201 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3202 sid_copy(&group_sid, &global_sid_Builtin_Users);
3203 num_profile_acls = 3;
3204 }
3205
3206 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3207
3208 /*
3209 * In the optimum case Creator Owner and Creator Group would be used for
3210 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3211 * would lead to usability problems under Windows: The Creator entries
3212 * are only available in browse lists of directories and not for files;
3213 * additionally the identity of the owning group couldn't be determined.
3214 * We therefore use those identities only for Default ACLs.
3215 */
3216
3217 /* Create the canon_ace lists. */
3218 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3219 &owner_sid, &group_sid, pal,
3220 SMB_ACL_TYPE_ACCESS);
3221
3222 /* We must have *some* ACLS. */
3223
3224 if (count_canon_ace_list(file_ace) == 0) {
3225 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3226 goto done;
3227 }
3228
3229 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3230 dir_ace = canonicalise_acl(conn, name, def_acl,
3231 sbuf,
3232 &global_sid_Creator_Owner,
3233 &global_sid_Creator_Group,
3234 pal, SMB_ACL_TYPE_DEFAULT);
3235 }
3236
3237 /*
3238 * Create the NT ACE list from the canonical ace lists.
3239 */
3240
3241 {
3242 canon_ace *ace;
3243 enum security_ace_type nt_acl_type;
3244
3245 if (nt4_compatible_acls() && dir_ace) {
3246 /*
3247 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3248 * but no non-INHERIT_ONLY entry for one SID. So we only
3249 * remove entries from the Access ACL if the
3250 * corresponding Default ACL entries have also been
3251 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3252 * are exceptions. We can do nothing
3253 * intelligent if the Default ACL contains entries that
3254 * are not also contained in the Access ACL, so this
3255 * case will still fail under NT 4.
3256 */
3257
3258 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3259 if (ace && !ace->perms) {
3260 DLIST_REMOVE(dir_ace, ace);
3261 SAFE_FREE(ace);
3262
3263 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3264 if (ace && !ace->perms) {
3265 DLIST_REMOVE(file_ace, ace);
3266 SAFE_FREE(ace);
3267 }
3268 }
3269
3270 /*
3271 * WinNT doesn't usually have Creator Group
3272 * in browse lists, so we send this entry to
3273 * WinNT even if it contains no relevant
3274 * permissions. Once we can add
3275 * Creator Group to browse lists we can
3276 * re-enable this.
3277 */
3278
3279 #if 0
3280 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3281 if (ace && !ace->perms) {
3282 DLIST_REMOVE(dir_ace, ace);
3283 SAFE_FREE(ace);
3284 }
3285 #endif
3286
3287 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3288 if (ace && !ace->perms) {
3289 DLIST_REMOVE(file_ace, ace);
3290 SAFE_FREE(ace);
3291 }
3292 }
3293
3294 num_acls = count_canon_ace_list(file_ace);
3295 num_def_acls = count_canon_ace_list(dir_ace);
3296
3297 /* Allocate the ace list. */
3298 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3299 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3300 goto done;
3301 }
3302
3303 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3304
3305 /*
3306 * Create the NT ACE list from the canonical ace lists.
3307 */
3308
3309 for (ace = file_ace; ace != NULL; ace = ace->next) {
3310 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3311 &nt_acl_type,
3312 ace->perms,
3313 S_ISDIR(sbuf->st_ex_mode));
3314 init_sec_ace(&nt_ace_list[num_aces++],
3315 &ace->trustee,
3316 nt_acl_type,
3317 acc,
3318 ace->ace_flags);
3319 }
3320
3321 /* The User must have access to a profile share - even
3322 * if we can't map the SID. */
3323 if (lp_profile_acls(SNUM(conn))) {
3324 add_or_replace_ace(nt_ace_list, &num_aces,
3325 &global_sid_Builtin_Users,
3326 SEC_ACE_TYPE_ACCESS_ALLOWED,
3327 FILE_GENERIC_ALL, 0);
3328 }
3329
3330 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3331 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3332 &nt_acl_type,
3333 ace->perms,
3334 S_ISDIR(sbuf->st_ex_mode));
3335 init_sec_ace(&nt_ace_list[num_aces++],
3336 &ace->trustee,
3337 nt_acl_type,
3338 acc,
3339 ace->ace_flags |
3340 SEC_ACE_FLAG_OBJECT_INHERIT|
3341 SEC_ACE_FLAG_CONTAINER_INHERIT|
3342 SEC_ACE_FLAG_INHERIT_ONLY);
3343 }
3344
3345 /* The User must have access to a profile share - even
3346 * if we can't map the SID. */
3347 if (lp_profile_acls(SNUM(conn))) {
3348 add_or_replace_ace(nt_ace_list, &num_aces,
3349 &global_sid_Builtin_Users,
3350 SEC_ACE_TYPE_ACCESS_ALLOWED,
3351 FILE_GENERIC_ALL,
3352 SEC_ACE_FLAG_OBJECT_INHERIT |
3353 SEC_ACE_FLAG_CONTAINER_INHERIT |
3354 SEC_ACE_FLAG_INHERIT_ONLY);
3355 }
3356
3357 /*
3358 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3359 * Win2K needs this to get the inheritance correct when replacing ACLs
3360 * on a directory tree. Based on work by Jim @ IBM.
3361 */
3362
3363 num_aces = merge_default_aces(nt_ace_list, num_aces);
3364
3365 if (lp_profile_acls(SNUM(conn))) {
3366 for (i = 0; i < num_aces; i++) {
3367 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3368 add_or_replace_ace(nt_ace_list, &num_aces,
3369 &orig_owner_sid,
3370 nt_ace_list[i].type,
3371 nt_ace_list[i].access_mask,
3372 nt_ace_list[i].flags);
3373 break;
3374 }
3375 }
3376 }
3377 }
3378
3379 if (num_aces) {
3380 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3381 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3382 goto done;
3383 }
3384 }
3385 } /* security_info & DACL_SECURITY_INFORMATION */
3386
3387 psd = make_standard_sec_desc( talloc_tos(),
3388 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3389 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3390 psa,
3391 &sd_size);
3392
3393 if(!psd) {
3394 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3395 sd_size = 0;
3396 goto done;
3397 }
3398
3399 /*
3400 * Windows 2000: The DACL_PROTECTED flag in the security
3401 * descriptor marks the ACL as non-inheriting, i.e., no
3402 * ACEs from higher level directories propagate to this
3403 * ACL. In the POSIX ACL model permissions are only
3404 * inherited at file create time, so ACLs never contain
3405 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3406 * flag doesn't seem to bother Windows NT.
3407 * Always set this if map acl inherit is turned off.
3408 */
3409 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3410 psd->type |= SEC_DESC_DACL_PROTECTED;
3411 } else {
3412 psd->type |= pal->sd_type;
3413 }
3414
3415 if (psd->dacl) {
3416 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3417 }
3418
3419 *ppdesc = psd;
3420
3421 done:
3422
3423 if (posix_acl) {
3424 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3425 }
3426 if (def_acl) {
3427 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3428 }
3429 free_canon_ace_list(file_ace);
3430 free_canon_ace_list(dir_ace);
3431 free_inherited_info(pal);
3432 SAFE_FREE(nt_ace_list);
3433
3434 return NT_STATUS_OK;
3435 }
3436
3437 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3438 SEC_DESC **ppdesc)
3439 {
3440 SMB_STRUCT_STAT sbuf;
3441 SMB_ACL_T posix_acl = NULL;
3442 struct pai_val *pal;
3443
3444 *ppdesc = NULL;
3445
3446 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3447 fsp_str_dbg(fsp)));
3448
3449 /* can it happen that fsp_name == NULL ? */
3450 if (fsp->is_directory || fsp->fh->fd == -1) {
3451 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3452 security_info, ppdesc);
3453 }
3454
3455 /* Get the stat struct for the owner info. */
3456 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3457 return map_nt_error_from_unix(errno);
3458 }
3459
3460 /* Get the ACL from the fd. */
3461 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3462
3463 pal = fload_inherited_info(fsp);
3464
3465 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3466 &sbuf, pal, posix_acl, NULL,
3467 security_info, ppdesc);
3468 }
3469
3470 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3471 uint32_t security_info, SEC_DESC **ppdesc)
3472 {
3473 SMB_ACL_T posix_acl = NULL;
3474 SMB_ACL_T def_acl = NULL;
3475 struct pai_val *pal;
3476 struct smb_filename smb_fname;
3477 int ret;
3478
3479 *ppdesc = NULL;
3480
3481 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3482
3483 ZERO_STRUCT(smb_fname);
3484 smb_fname.base_name = discard_const_p(char, name);
3485
3486 /* Get the stat struct for the owner info. */
3487 if (lp_posix_pathnames()) {
3488 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3489 } else {
3490 ret = SMB_VFS_STAT(conn, &smb_fname);
3491 }
3492
3493 if (ret == -1) {
3494 return map_nt_error_from_unix(errno);
3495 }
3496
3497 /* Get the ACL from the path. */
3498 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3499
3500 /* If it's a directory get the default POSIX ACL. */
3501 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3502 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3503 def_acl = free_empty_sys_acl(conn, def_acl);
3504 }
3505
3506 pal = load_inherited_info(conn, name);
3507
3508 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3509 posix_acl, def_acl, security_info,
3510 ppdesc);
3511 }
3512
3513 /****************************************************************************
3514 Try to chown a file. We will be able to chown it under the following conditions.
3515
3516 1) If we have root privileges, then it will just work.
3517 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3518 3) If we have SeRestorePrivilege we can change the user to any other user.
3519 4) If we have write permission to the file and dos_filemodes is set
3520 then allow chown to the currently authenticated user.
3521 ****************************************************************************/
3522
3523 int try_chown(connection_struct *conn, struct smb_filename *smb_fname,
3524 uid_t uid, gid_t gid)
3525 {
3526 int ret;
3527 files_struct *fsp;
3528
3529 if(!CAN_WRITE(conn)) {
3530 return -1;
3531 }
3532
3533 /* Case (1). */
3534 /* try the direct way first */
3535 if (lp_posix_pathnames()) {
3536 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3537 } else {
3538 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3539 }
3540
3541 if (ret == 0)
3542 return 0;
3543
3544 /* Case (2) / (3) */
3545 if (lp_enable_privileges()) {
3546
3547 bool has_take_ownership_priv = user_has_privileges(get_current_nttok(conn),
3548 &se_take_ownership);
3549 bool has_restore_priv = user_has_privileges(get_current_nttok(conn),
3550 &se_restore);
3551
3552 /* Case (2) */
3553 if ( ( has_take_ownership_priv && ( uid == get_current_uid(conn) ) ) ||
3554 /* Case (3) */
3555 ( has_restore_priv ) ) {
3556
3557 become_root();
3558 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3559 if (lp_posix_pathnames()) {
3560 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3561 (gid_t)-1);
3562 } else {
3563 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3564 (gid_t)-1);
3565 }
3566 unbecome_root();
3567 return ret;
3568 }
3569 }
3570
3571 /* Case (4). */
3572 if (!lp_dos_filemode(SNUM(conn))) {
3573 errno = EPERM;
3574 return -1;
3575 }
3576
3577 /* only allow chown to the current user. This is more secure,
3578 and also copes with the case where the SID in a take ownership ACL is
3579 a local SID on the users workstation
3580 */
3581 if (uid != get_current_uid(conn)) {
3582 errno = EPERM;
3583 return -1;
3584 }
3585
3586 if (lp_posix_pathnames()) {
3587 ret = SMB_VFS_LSTAT(conn, smb_fname);
3588 } else {
3589 ret = SMB_VFS_STAT(conn, smb_fname);
3590 }
3591
3592 if (ret == -1) {
3593 return -1;
3594 }
3595
3596 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, smb_fname, &fsp))) {
3597 return -1;
3598 }
3599
3600 become_root();
3601 /* Keep the current file gid the same. */
3602 if (fsp->fh->fd == -1) {
3603 if (lp_posix_pathnames()) {
3604 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3605 (gid_t)-1);
3606 } else {
3607 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3608 (gid_t)-1);
3609 }
3610 } else {
3611 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3612 }
3613 unbecome_root();
3614
3615 close_file_fchmod(NULL, fsp);
3616
3617 return ret;
3618 }
3619
3620 #if 0
3621 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3622
3623 /****************************************************************************
3624 Take care of parent ACL inheritance.
3625 ****************************************************************************/
3626
3627 NTSTATUS append_parent_acl(files_struct *fsp,
3628 const SEC_DESC *pcsd,
3629 SEC_DESC **pp_new_sd)
3630 {
3631 struct smb_filename *smb_dname = NULL;
3632 SEC_DESC *parent_sd = NULL;
3633 files_struct *parent_fsp = NULL;
3634 TALLOC_CTX *mem_ctx = talloc_tos();
3635 char *parent_name = NULL;
3636 SEC_ACE *new_ace = NULL;
3637 unsigned int num_aces = pcsd->dacl->num_aces;
3638 NTSTATUS status;
3639 int info;
3640 unsigned int i, j;
3641 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3642 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3643
3644 if (psd == NULL) {
3645 return NT_STATUS_NO_MEMORY;
3646 }
3647
3648 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3649 NULL)) {
3650 return NT_STATUS_NO_MEMORY;
3651 }
3652
3653 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3654 &smb_dname);
3655 if (!NT_STATUS_IS_OK(status)) {
3656 goto fail;
3657 }
3658
3659 status = SMB_VFS_CREATE_FILE(
3660 fsp->conn, /* conn */
3661 NULL, /* req */
3662 0, /* root_dir_fid */
3663 smb_dname, /* fname */
3664 FILE_READ_ATTRIBUTES, /* access_mask */
3665 FILE_SHARE_NONE, /* share_access */
3666 FILE_OPEN, /* create_disposition*/
3667 FILE_DIRECTORY_FILE, /* create_options */
3668 0, /* file_attributes */
3669 INTERNAL_OPEN_ONLY, /* oplock_request */
3670 0, /* allocation_size */
3671 NULL, /* sd */
3672 NULL, /* ea_list */
3673 &parent_fsp, /* result */
3674 &info); /* pinfo */
3675
3676 if (!NT_STATUS_IS_OK(status)) {
3677 TALLOC_FREE(smb_dname);
3678 return status;
3679 }
3680
3681 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3682 DACL_SECURITY_INFORMATION, &parent_sd );
3683
3684 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3685 TALLOC_FREE(smb_dname);
3686
3687 if (!NT_STATUS_IS_OK(status)) {
3688 return status;
3689 }
3690
3691 /*
3692 * Make room for potentially all the ACLs from
3693 * the parent. We used to add the ugw triple here,
3694 * as we knew we were dealing with POSIX ACLs.
3695 * We no longer need to do so as we can guarentee
3696 * that a default ACL from the parent directory will
3697 * be well formed for POSIX ACLs if it came from a
3698 * POSIX ACL source, and if we're not writing to a
3699 * POSIX ACL sink then we don't care if it's not well
3700 * formed. JRA.
3701 */
3702
3703 num_aces += parent_sd->dacl->num_aces;
3704
3705 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3706 num_aces)) == NULL) {
3707 return NT_STATUS_NO_MEMORY;
3708 }
3709
3710 /* Start by copying in all the given ACE entries. */
3711 for (i = 0; i < psd->dacl->num_aces; i++) {
3712 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3713 }
3714
3715 /*
3716 * Note that we're ignoring "inherit permissions" here
3717 * as that really only applies to newly created files. JRA.
3718 */
3719
3720 /* Finally append any inherited ACEs. */
3721 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3722 SEC_ACE *se = &parent_sd->dacl->aces[j];
3723
3724 if (fsp->is_directory) {
3725 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3726 /* Doesn't apply to a directory - ignore. */
3727 DEBUG(10,("append_parent_acl: directory %s "
3728 "ignoring non container "
3729 "inherit flags %u on ACE with sid %s "
3730 "from parent %s\n",
3731 fsp_str_dbg(fsp),
3732 (unsigned int)se->flags,
3733 sid_string_dbg(&se->trustee),
3734 parent_name));
3735 continue;
3736 }
3737 } else {
3738 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3739 /* Doesn't apply to a file - ignore. */
3740 DEBUG(10,("append_parent_acl: file %s "
3741 "ignoring non object "
3742 "inherit flags %u on ACE with sid %s "
3743 "from parent %s\n",
3744 fsp_str_dbg(fsp),
3745 (unsigned int)se->flags,
3746 sid_string_dbg(&se->trustee),
3747 parent_name));
3748 continue;
3749 }
3750 }
3751
3752 if (is_dacl_protected) {
3753 /* If the DACL is protected it means we must
3754 * not overwrite an existing ACE entry with the
3755 * same SID. This is order N^2. Ouch :-(. JRA. */
3756 unsigned int k;
3757 for (k = 0; k < psd->dacl->num_aces; k++) {
3758 if (sid_equal(&psd->dacl->aces[k].trustee,
3759 &se->trustee)) {
3760 break;
3761 }
3762 }
3763 if (k < psd->dacl->num_aces) {
3764 /* SID matched. Ignore. */
3765 DEBUG(10,("append_parent_acl: path %s "
3766 "ignoring ACE with protected sid %s "
3767 "from parent %s\n",
3768 fsp_str_dbg(fsp),
3769 sid_string_dbg(&se->trustee),
3770 parent_name));
3771 continue;
3772 }
3773 }
3774
3775 sec_ace_copy(&new_ace[i], se);
3776 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3777 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3778 }
3779 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3780
3781 if (fsp->is_directory) {
3782 /*
3783 * Strip off any inherit only. It's applied.
3784 */
3785 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3786 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3787 /* No further inheritance. */
3788 new_ace[i].flags &=
3789 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3790 SEC_ACE_FLAG_OBJECT_INHERIT);
3791 }
3792 } else {
3793 /*
3794 * Strip off any container or inherit
3795 * flags, they can't apply to objects.
3796 */
3797 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3798 SEC_ACE_FLAG_INHERIT_ONLY|
3799 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3800 }
3801 i++;
3802
3803 DEBUG(10,("append_parent_acl: path %s "
3804 "inheriting ACE with sid %s "
3805 "from parent %s\n",
3806 fsp_str_dbg(fsp),
3807 sid_string_dbg(&se->trustee),
3808 parent_name));
3809 }
3810
3811 psd->dacl->aces = new_ace;
3812 psd->dacl->num_aces = i;
3813 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3814 SE_DESC_DACL_AUTO_INHERIT_REQ);
3815
3816 *pp_new_sd = psd;
3817 return status;
3818 }
3819 #endif
3820
3821 /****************************************************************************
3822 Reply to set a security descriptor on an fsp. security_info_sent is the
3823 description of the following NT ACL.
3824 This should be the only external function needed for the UNIX style set ACL.
3825 ****************************************************************************/
3826
3827 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3828 {
3829 connection_struct *conn = fsp->conn;
3830 uid_t user = (uid_t)-1;
3831 gid_t grp = (gid_t)-1;
3832 DOM_SID file_owner_sid;
3833 DOM_SID file_grp_sid;
3834 canon_ace *file_ace_list = NULL;
3835 canon_ace *dir_ace_list = NULL;
3836 bool acl_perms = False;
3837 mode_t orig_mode = (mode_t)0;
3838 NTSTATUS status;
3839 bool set_acl_as_root = false;
3840 bool acl_set_support = false;
3841 bool ret = false;
3842
3843 DEBUG(10,("set_nt_acl: called for file %s\n",
3844 fsp_str_dbg(fsp)));
3845
3846 if (!CAN_WRITE(conn)) {
3847 DEBUG(10,("set acl rejected on read-only share\n"));
3848 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3849 }
3850
3851 /*
3852 * Get the current state of the file.
3853 */
3854
3855 status = vfs_stat_fsp(fsp);
3856 if (!NT_STATUS_IS_OK(status)) {
3857 return status;
3858 }
3859
3860 /* Save the original element we check against. */
3861 orig_mode = fsp->fsp_name->st.st_ex_mode;
3862
3863 /*
3864 * Unpack the user/group/world id's.
3865 */
3866
3867 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3868 if (!NT_STATUS_IS_OK(status)) {
3869 return status;
3870 }
3871
3872 /*
3873 * Do we need to chown ? If so this must be done first as the incoming
3874 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3875 * Noticed by Simo.
3876 */
3877
3878 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3879 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3880
3881 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3882 fsp_str_dbg(fsp), (unsigned int)user,
3883 (unsigned int)grp));
3884
3885 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3886 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3887 "= %s.\n", fsp_str_dbg(fsp),
3888 (unsigned int)user, (unsigned int)grp,
3889 strerror(errno)));
3890 if (errno == EPERM) {
3891 return NT_STATUS_INVALID_OWNER;
3892 }
3893 return map_nt_error_from_unix(errno);
3894 }
3895
3896 /*
3897 * Recheck the current state of the file, which may have changed.
3898 * (suid/sgid bits, for instance)
3899 */
3900
3901 status = vfs_stat_fsp(fsp);
3902 if (!NT_STATUS_IS_OK(status)) {
3903 return status;
3904 }
3905
3906 /* Save the original element we check against. */
3907 orig_mode = fsp->fsp_name->st.st_ex_mode;
3908
3909 /* If we successfully chowned, we know we must
3910 * be able to set the acl, so do it as root.
3911 */
3912 set_acl_as_root = true;
3913 }
3914
3915 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3916
3917 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3918 &file_grp_sid, &file_ace_list,
3919 &dir_ace_list, security_info_sent, psd);
3920
3921 /* Ignore W2K traverse DACL set. */
3922 if (!file_ace_list && !dir_ace_list) {
3923 return NT_STATUS_OK;
3924 }
3925
3926 if (!acl_perms) {
3927 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3928 free_canon_ace_list(file_ace_list);
3929 free_canon_ace_list(dir_ace_list);
3930 return NT_STATUS_ACCESS_DENIED;
3931 }
3932
3933 /*
3934 * Only change security if we got a DACL.
3935 */
3936
3937 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3938 free_canon_ace_list(file_ace_list);
3939 free_canon_ace_list(dir_ace_list);
3940 return NT_STATUS_OK;
3941 }
3942
3943 /*
3944 * Try using the POSIX ACL set first. Fall back to chmod if
3945 * we have no ACL support on this filesystem.
3946 */
3947
3948 if (acl_perms && file_ace_list) {
3949 if (set_acl_as_root) {
3950 become_root();
3951 }
3952 ret = set_canon_ace_list(fsp, file_ace_list, false,
3953 &fsp->fsp_name->st, &acl_set_support);
3954 if (set_acl_as_root) {
3955 unbecome_root();
3956 }
3957 if (acl_set_support && ret == false) {
3958 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3959 "%s (%s).\n", fsp_str_dbg(fsp),
3960 strerror(errno)));
3961 free_canon_ace_list(file_ace_list);
3962 free_canon_ace_list(dir_ace_list);
3963 return map_nt_error_from_unix(errno);
3964 }
3965 }
3966
3967 if (acl_perms && acl_set_support && fsp->is_directory) {
3968 if (dir_ace_list) {
3969 if (set_acl_as_root) {
3970 become_root();
3971 }
3972 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3973 &fsp->fsp_name->st,
3974 &acl_set_support);
3975 if (set_acl_as_root) {
3976 unbecome_root();
3977 }
3978 if (ret == false) {
3979 DEBUG(3,("set_nt_acl: failed to set default "
3980 "acl on directory %s (%s).\n",
3981 fsp_str_dbg(fsp), strerror(errno)));
3982 free_canon_ace_list(file_ace_list);
3983 free_canon_ace_list(dir_ace_list);
3984 return map_nt_error_from_unix(errno);
3985 }
3986 } else {
3987 int sret = -1;
3988
3989 /*
3990 * No default ACL - delete one if it exists.
3991 */
3992
3993 if (set_acl_as_root) {
3994 become_root();
3995 }
3996 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3997 fsp->fsp_name->base_name);
3998 if (set_acl_as_root) {
3999 unbecome_root();
4000 }
4001 if (sret == -1) {
4002 if (acl_group_override(conn, fsp->fsp_name)) {
4003 DEBUG(5,("set_nt_acl: acl group "
4004 "control on and current user "
4005 "in file %s primary group. "
4006 "Override delete_def_acl\n",
4007 fsp_str_dbg(fsp)));
4008
4009 become_root();
4010 sret =
4011 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4012 conn,
4013 fsp->fsp_name->base_name);
4014 unbecome_root();
4015 }
4016
4017 if (sret == -1) {
4018 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4019 free_canon_ace_list(file_ace_list);
4020 free_canon_ace_list(dir_ace_list);
4021 return map_nt_error_from_unix(errno);
4022 }
4023 }
4024 }
4025 }
4026
4027 if (acl_set_support) {
4028 if (set_acl_as_root) {
4029 become_root();
4030 }
4031 store_inheritance_attributes(fsp,
4032 file_ace_list,
4033 dir_ace_list,
4034 psd->type);
4035 if (set_acl_as_root) {
4036 unbecome_root();
4037 }
4038 }
4039
4040 /*
4041 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4042 */
4043
4044 if(!acl_set_support && acl_perms) {
4045 mode_t posix_perms;
4046
4047 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4048 free_canon_ace_list(file_ace_list);
4049 free_canon_ace_list(dir_ace_list);
4050 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4051 "posix permissions for file %s.\n",
4052 fsp_str_dbg(fsp)));
4053 return NT_STATUS_ACCESS_DENIED;
4054 }
4055
4056 if (orig_mode != posix_perms) {
4057 int sret = -1;
4058
4059 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4060 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4061
4062 if (set_acl_as_root) {
4063 become_root();
4064 }
4065 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4066 posix_perms);
4067 if (set_acl_as_root) {
4068 unbecome_root();
4069 }
4070 if(sret == -1) {
4071 if (acl_group_override(conn, fsp->fsp_name)) {
4072 DEBUG(5,("set_nt_acl: acl group "
4073 "control on and current user "
4074 "in file %s primary group. "
4075 "Override chmod\n",
4076 fsp_str_dbg(fsp)));
4077
4078 become_root();
4079 sret = SMB_VFS_CHMOD(conn,
4080 fsp->fsp_name->base_name,
4081 posix_perms);
4082 unbecome_root();
4083 }
4084
4085 if (sret == -1) {
4086 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4087 "failed. Error = %s.\n",
4088 fsp_str_dbg(fsp),
4089 (unsigned int)posix_perms,
4090 strerror(errno)));
4091 free_canon_ace_list(file_ace_list);
4092 free_canon_ace_list(dir_ace_list);
4093 return map_nt_error_from_unix(errno);
4094 }
4095 }
4096 }
4097 }
4098
4099 free_canon_ace_list(file_ace_list);
4100 free_canon_ace_list(dir_ace_list);
4101
4102 /* Ensure the stat struct in the fsp is correct. */
4103 status = vfs_stat_fsp(fsp);
4104
4105 return NT_STATUS_OK;
4106 }
4107
4108 /****************************************************************************
4109 Get the actual group bits stored on a file with an ACL. Has no effect if
4110 the file has no ACL. Needed in dosmode code where the stat() will return
4111 the mask bits, not the real group bits, for a file with an ACL.
4112 ****************************************************************************/
4113
4114 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4115 {
4116 int entry_id = SMB_ACL_FIRST_ENTRY;
4117 SMB_ACL_ENTRY_T entry;
4118 SMB_ACL_T posix_acl;
4119 int result = -1;
4120
4121 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4122 if (posix_acl == (SMB_ACL_T)NULL)
4123 return -1;
4124
4125 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4126 SMB_ACL_TAG_T tagtype;
4127 SMB_ACL_PERMSET_T permset;
4128
4129 entry_id = SMB_ACL_NEXT_ENTRY;
4130
4131 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4132 break;
4133
4134 if (tagtype == SMB_ACL_GROUP_OBJ) {
4135 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4136 break;
4137 } else {
4138 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4139 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4140 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4141 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4142 result = 0;
4143 break;
4144 }
4145 }
4146 }
4147 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4148 return result;
4149 }
4150
4151 /****************************************************************************
4152 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4153 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4154 ****************************************************************************/
4155
4156 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4157 {
4158 int entry_id = SMB_ACL_FIRST_ENTRY;
4159 SMB_ACL_ENTRY_T entry;
4160 int num_entries = 0;
4161
4162 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4163 SMB_ACL_TAG_T tagtype;
4164 SMB_ACL_PERMSET_T permset;
4165 mode_t perms;
4166
4167 entry_id = SMB_ACL_NEXT_ENTRY;
4168
4169 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4170 return -1;
4171
4172 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4173 return -1;
4174
4175 num_entries++;
4176
4177 switch(tagtype) {
4178 case SMB_ACL_USER_OBJ:
4179 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4180 break;
4181 case SMB_ACL_GROUP_OBJ:
4182 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4183 break;
4184 case SMB_ACL_MASK:
4185 /*
4186 * FIXME: The ACL_MASK entry permissions should really be set to
4187 * the union of the permissions of all ACL_USER,
4188 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4189 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4190 */
4191 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4192 break;
4193 case SMB_ACL_OTHER:
4194 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4195 break;
4196 default:
4197 continue;
4198 }
4199
4200 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4201 return -1;
4202
4203 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4204 return -1;
4205 }
4206
4207 /*
4208 * If this is a simple 3 element ACL or no elements then it's a standard
4209 * UNIX permission set. Just use chmod...
4210 */
4211
4212 if ((num_entries == 3) || (num_entries == 0))
4213 return -1;
4214
4215 return 0;
4216 }
4217
4218 /****************************************************************************
4219 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4220 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4221 resulting ACL on TO. Note that name is in UNIX character set.
4222 ****************************************************************************/
4223
4224 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4225 {
4226 SMB_ACL_T posix_acl = NULL;
4227 int ret = -1;
4228
4229 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4230 return -1;
4231
4232 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4233 goto done;
4234
4235 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4236
4237 done:
4238
4239 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4240 return ret;
4241 }
4242
4243 /****************************************************************************
4244 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4245 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4246 Note that name is in UNIX character set.
4247 ****************************************************************************/
4248
4249 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4250 {
4251 return copy_access_posix_acl(conn, name, name, mode);
4252 }
4253
4254 /****************************************************************************
4255 Check for an existing default POSIX ACL on a directory.
4256 ****************************************************************************/
4257
4258 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4259 {
4260 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4261 bool has_acl = False;
4262 SMB_ACL_ENTRY_T entry;
4263
4264 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4265 has_acl = True;
4266 }
4267
4268 if (def_acl) {
4269 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4270 }
4271 return has_acl;
4272 }
4273
4274 /****************************************************************************
4275 If the parent directory has no default ACL but it does have an Access ACL,
4276 inherit this Access ACL to file name.
4277 ****************************************************************************/
4278
4279 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4280 const char *name, mode_t mode)
4281 {
4282 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4283 return 0;
4284
4285 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4286 }
4287
4288 /****************************************************************************
4289 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4290 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4291 ****************************************************************************/
4292
4293 int fchmod_acl(files_struct *fsp, mode_t mode)
4294 {
4295 connection_struct *conn = fsp->conn;
4296 SMB_ACL_T posix_acl = NULL;
4297 int ret = -1;
4298
4299 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4300 return -1;
4301
4302 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4303 goto done;
4304
4305 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4306
4307 done:
4308
4309 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4310 return ret;
4311 }
4312
4313 /****************************************************************************
4314 Map from wire type to permset.
4315 ****************************************************************************/
4316
4317 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4318 {
4319 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4320 return False;
4321 }
4322
4323 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4324 return False;
4325 }
4326
4327 if (wire_perm & SMB_POSIX_ACL_READ) {
4328 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4329 return False;
4330 }
4331 }
4332 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4333 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4334 return False;
4335 }
4336 }
4337 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4338 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4339 return False;
4340 }
4341 }
4342 return True;
4343 }
4344
4345 /****************************************************************************
4346 Map from wire type to tagtype.
4347 ****************************************************************************/
4348
4349 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4350 {
4351 switch (wire_tt) {
4352 case SMB_POSIX_ACL_USER_OBJ:
4353 *p_tt = SMB_ACL_USER_OBJ;
4354 break;
4355 case SMB_POSIX_ACL_USER:
4356 *p_tt = SMB_ACL_USER;
4357 break;
4358 case SMB_POSIX_ACL_GROUP_OBJ:
4359 *p_tt = SMB_ACL_GROUP_OBJ;
4360 break;
4361 case SMB_POSIX_ACL_GROUP:
4362 *p_tt = SMB_ACL_GROUP;
4363 break;
4364 case SMB_POSIX_ACL_MASK:
4365 *p_tt = SMB_ACL_MASK;
4366 break;
4367 case SMB_POSIX_ACL_OTHER:
4368 *p_tt = SMB_ACL_OTHER;
4369 break;
4370 default:
4371 return False;
4372 }
4373 return True;
4374 }
4375
4376 /****************************************************************************
4377 Create a new POSIX acl from wire permissions.
4378 FIXME ! How does the share mask/mode fit into this.... ?
4379 ****************************************************************************/
4380
4381 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4382 {
4383 unsigned int i;
4384 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4385
4386 if (the_acl == NULL) {
4387 return NULL;
4388 }
4389
4390 for (i = 0; i < num_acls; i++) {
4391 SMB_ACL_ENTRY_T the_entry;
4392 SMB_ACL_PERMSET_T the_permset;
4393 SMB_ACL_TAG_T tag_type;
4394
4395 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4396 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4397 i, strerror(errno) ));
4398 goto fail;
4399 }
4400
4401 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4402 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4403 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4404 goto fail;
4405 }
4406
4407 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4408 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4409 i, strerror(errno) ));
4410 goto fail;
4411 }
4412
4413 /* Get the permset pointer from the new ACL entry. */
4414 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4415 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4416 i, strerror(errno) ));
4417 goto fail;
4418 }
4419
4420 /* Map from wire to permissions. */
4421 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4422 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4423 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4424 goto fail;
4425 }
4426
4427 /* Now apply to the new ACL entry. */
4428 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4429 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4430 i, strerror(errno) ));
4431 goto fail;
4432 }
4433
4434 if (tag_type == SMB_ACL_USER) {
4435 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4436 uid_t uid = (uid_t)uidval;
4437 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4438 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4439 (unsigned int)uid, i, strerror(errno) ));
4440 goto fail;
4441 }
4442 }
4443
4444 if (tag_type == SMB_ACL_GROUP) {
4445 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4446 gid_t gid = (uid_t)gidval;
4447 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4448 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4449 (unsigned int)gid, i, strerror(errno) ));
4450 goto fail;
4451 }
4452 }
4453 }
4454
4455 return the_acl;
4456
4457 fail:
4458
4459 if (the_acl != NULL) {
4460 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4461 }
4462 return NULL;
4463 }
4464
4465 /****************************************************************************
4466 Calls from UNIX extensions - Default POSIX ACL set.
4467 If num_def_acls == 0 and not a directory just return. If it is a directory
4468 and num_def_acls == 0 then remove the default acl. Else set the default acl
4469 on the directory.
4470 ****************************************************************************/
4471
4472 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4473 uint16 num_def_acls, const char *pdata)
4474 {
4475 SMB_ACL_T def_acl = NULL;
4476
4477 if (!S_ISDIR(psbuf->st_ex_mode)) {
4478 if (num_def_acls) {
4479 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4480 errno = EISDIR;
4481 return False;
4482 } else {
4483 return True;
4484 }
4485 }
4486
4487 if (!num_def_acls) {
4488 /* Remove the default ACL. */
4489 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4490 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4491 fname, strerror(errno) ));
4492 return False;
4493 }
4494 return True;
4495 }
4496
4497 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4498 return False;
4499 }
4500
4501 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4502 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4503 fname, strerror(errno) ));
4504 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4505 return False;
4506 }
4507
4508 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4509 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4510 return True;
4511 }
4512
4513 /****************************************************************************
4514 Remove an ACL from a file. As we don't have acl_delete_entry() available
4515 we must read the current acl and copy all entries except MASK, USER and GROUP
4516 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4517 removed.
4518 FIXME ! How does the share mask/mode fit into this.... ?
4519 ****************************************************************************/
4520
4521 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4522 {
4523 SMB_ACL_T file_acl = NULL;
4524 int entry_id = SMB_ACL_FIRST_ENTRY;
4525 SMB_ACL_ENTRY_T entry;
4526 bool ret = False;
4527 /* Create a new ACL with only 3 entries, u/g/w. */
4528 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4529 SMB_ACL_ENTRY_T user_ent = NULL;
4530 SMB_ACL_ENTRY_T group_ent = NULL;
4531 SMB_ACL_ENTRY_T other_ent = NULL;
4532
4533 if (new_file_acl == NULL) {
4534 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4535 return False;
4536 }
4537
4538 /* Now create the u/g/w entries. */
4539 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4540 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4541 fname, strerror(errno) ));
4542 goto done;
4543 }
4544 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4545 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4546 fname, strerror(errno) ));
4547 goto done;
4548 }
4549
4550 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4551 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4552 fname, strerror(errno) ));
4553 goto done;
4554 }
4555 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4556 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4557 fname, strerror(errno) ));
4558 goto done;
4559 }
4560
4561 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4562 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4563 fname, strerror(errno) ));
4564 goto done;
4565 }
4566 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4567 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4568 fname, strerror(errno) ));
4569 goto done;
4570 }
4571
4572 /* Get the current file ACL. */
4573 if (fsp && fsp->fh->fd != -1) {
4574 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4575 } else {
4576 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4577 }
4578
4579 if (file_acl == NULL) {
4580 /* This is only returned if an error occurred. Even for a file with
4581 no acl a u/g/w acl should be returned. */
4582 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4583 fname, strerror(errno) ));
4584 goto done;
4585 }
4586
4587 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4588 SMB_ACL_TAG_T tagtype;
4589 SMB_ACL_PERMSET_T permset;
4590
4591 entry_id = SMB_ACL_NEXT_ENTRY;
4592
4593 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4594 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4595 fname, strerror(errno) ));
4596 goto done;
4597 }
4598
4599 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4600 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4601 fname, strerror(errno) ));
4602 goto done;
4603 }
4604
4605 if (tagtype == SMB_ACL_USER_OBJ) {
4606 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4607 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4608 fname, strerror(errno) ));
4609 }
4610 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4611 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4612 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4613 fname, strerror(errno) ));
4614 }
4615 } else if (tagtype == SMB_ACL_OTHER) {
4616 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4617 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4618 fname, strerror(errno) ));
4619 }
4620 }
4621 }
4622
4623 /* Set the new empty file ACL. */
4624 if (fsp && fsp->fh->fd != -1) {
4625 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4626 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4627 fname, strerror(errno) ));
4628 goto done;
4629 }
4630 } else {
4631 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4632 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4633 fname, strerror(errno) ));
4634 goto done;
4635 }
4636 }
4637
4638 ret = True;
4639
4640 done:
4641
4642 if (file_acl) {
4643 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4644 }
4645 if (new_file_acl) {
4646 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4647 }
4648 return ret;
4649 }
4650
4651 /****************************************************************************
4652 Calls from UNIX extensions - POSIX ACL set.
4653 If num_def_acls == 0 then read/modify/write acl after removing all entries
4654 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4655 ****************************************************************************/
4656
4657 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4658 {
4659 SMB_ACL_T file_acl = NULL;
4660
4661 if (!num_acls) {
4662 /* Remove the ACL from the file. */
4663 return remove_posix_acl(conn, fsp, fname);
4664 }
4665
4666 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4667 return False;
4668 }
4669
4670 if (fsp && fsp->fh->fd != -1) {
4671 /* The preferred way - use an open fd. */
4672 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4673 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4674 fname, strerror(errno) ));
4675 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4676 return False;
4677 }
4678 } else {
4679 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4680 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4681 fname, strerror(errno) ));
4682 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4683 return False;
4684 }
4685 }
4686
4687 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4688 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4689 return True;
4690 }
4691
4692 /********************************************************************
4693 Pull the NT ACL from a file on disk or the OpenEventlog() access
4694 check. Caller is responsible for freeing the returned security
4695 descriptor via TALLOC_FREE(). This is designed for dealing with
4696 user space access checks in smbd outside of the VFS. For example,
4697 checking access rights in OpenEventlog().
4698
4699 Assume we are dealing with files (for now)
4700 ********************************************************************/
4701
4702 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4703 {
4704 SEC_DESC *psd, *ret_sd;
4705 connection_struct *conn;
4706 files_struct finfo;
4707 struct fd_handle fh;
4708 NTSTATUS status;
4709
4710 conn = TALLOC_ZERO_P(ctx, connection_struct);
4711 if (conn == NULL) {
4712 DEBUG(0, ("talloc failed\n"));
4713 return NULL;
4714 }
4715
4716 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4717 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4718 TALLOC_FREE(conn);
4719 return NULL;
4720 }
4721
4722 conn->params->service = -1;
4723
4724 set_conn_connectpath(conn, "/");
4725
4726 if (!smbd_vfs_init(conn)) {
4727 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4728 conn_free(conn);
4729 return NULL;
4730 }
4731
4732 ZERO_STRUCT( finfo );
4733 ZERO_STRUCT( fh );
4734
4735 finfo.fnum = -1;
4736 finfo.conn = conn;
4737 finfo.fh = &fh;
4738 finfo.fh->fd = -1;
4739
4740 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4741 &finfo.fsp_name);
4742 if (!NT_STATUS_IS_OK(status)) {
4743 conn_free(conn);
4744 return NULL;
4745 }
4746
4747 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4748 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4749 TALLOC_FREE(finfo.fsp_name);
4750 conn_free(conn);
4751 return NULL;
4752 }
4753
4754 ret_sd = dup_sec_desc( ctx, psd );
4755
4756 TALLOC_FREE(finfo.fsp_name);
4757 conn_free(conn);
4758
4759 return ret_sd;
4760 }
reg import