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Ensure when setting a POSIX ACL, that the uid for a
[Samba/vl.git] / source3 / smbd / posix_acls.c
blob029eeaeeccb14f65a5d9d57a956d0f274935f177
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "system/filesys.h"
25 #include "../libcli/security/security.h"
26 #include "trans2.h"
27 #include "passdb/lookup_sid.h"
28 #include "auth.h"
29
30 extern const struct generic_mapping file_generic_mapping;
31
32 #undef DBGC_CLASS
33 #define DBGC_CLASS DBGC_ACLS
34
35 /****************************************************************************
36 Data structures representing the internal ACE format.
37 ****************************************************************************/
38
39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
41
42 typedef union posix_id {
43 uid_t uid;
44 gid_t gid;
45 int world;
46 } posix_id;
47
48 typedef struct canon_ace {
49 struct canon_ace *next, *prev;
50 SMB_ACL_TAG_T type;
51 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
52 struct dom_sid trustee;
53 enum ace_owner owner_type;
54 enum ace_attribute attr;
55 posix_id unix_ug;
56 uint8_t ace_flags; /* From windows ACE entry. */
57 } canon_ace;
58
59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
60
61 /*
62 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
63 * attribute on disk - version 1.
64 * All values are little endian.
65 *
66 * | 1 | 1 | 2 | 2 | ....
67 * +------+------+-------------+---------------------+-------------+--------------------+
68 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
69 * +------+------+-------------+---------------------+-------------+--------------------+
70 *
71 * Entry format is :
72 *
73 * | 1 | 4 |
74 * +------+-------------------+
75 * | value| uid/gid or world |
76 * | type | value |
77 * +------+-------------------+
78 *
79 * Version 2 format. Stores extra Windows metadata about an ACL.
80 *
81 * | 1 | 2 | 2 | 2 | ....
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
84 * | 2 | type | | | | |
85 * +------+----------+-------------+---------------------+-------------+--------------------+
86 *
87 * Entry format is :
88 *
89 * | 1 | 1 | 4 |
90 * +------+------+-------------------+
91 * | ace | value| uid/gid or world |
92 * | flag | type | value |
93 * +------+-------------------+------+
94 *
95 */
96
97 #define PAI_VERSION_OFFSET 0
98
99 #define PAI_V1_FLAG_OFFSET 1
100 #define PAI_V1_NUM_ENTRIES_OFFSET 2
101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
102 #define PAI_V1_ENTRIES_BASE 6
103 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
104 #define PAI_V1_ENTRY_LENGTH 5
105
106 #define PAI_V1_VERSION 1
107
108 #define PAI_V2_TYPE_OFFSET 1
109 #define PAI_V2_NUM_ENTRIES_OFFSET 3
110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
111 #define PAI_V2_ENTRIES_BASE 7
112 #define PAI_V2_ENTRY_LENGTH 6
113
114 #define PAI_V2_VERSION 2
115
116 /*
117 * In memory format of user.SAMBA_PAI attribute.
118 */
119
120 struct pai_entry {
121 struct pai_entry *next, *prev;
122 uint8_t ace_flags;
123 enum ace_owner owner_type;
124 posix_id unix_ug;
125 };
126
127 struct pai_val {
128 uint16_t sd_type;
129 unsigned int num_entries;
130 struct pai_entry *entry_list;
131 unsigned int num_def_entries;
132 struct pai_entry *def_entry_list;
133 };
134
135 /************************************************************************
136 Return a uint32 of the pai_entry principal.
137 ************************************************************************/
138
139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
140 {
141 switch (paie->owner_type) {
142 case UID_ACE:
143 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
144 return (uint32_t)paie->unix_ug.uid;
145 case GID_ACE:
146 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
147 return (uint32_t)paie->unix_ug.gid;
148 case WORLD_ACE:
149 default:
150 DEBUG(10,("get_pai_entry_val: world ace\n"));
151 return (uint32_t)-1;
152 }
153 }
154
155 /************************************************************************
156 Return a uint32 of the entry principal.
157 ************************************************************************/
158
159 static uint32_t get_entry_val(canon_ace *ace_entry)
160 {
161 switch (ace_entry->owner_type) {
162 case UID_ACE:
163 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
164 return (uint32_t)ace_entry->unix_ug.uid;
165 case GID_ACE:
166 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
167 return (uint32_t)ace_entry->unix_ug.gid;
168 case WORLD_ACE:
169 default:
170 DEBUG(10,("get_entry_val: world ace\n"));
171 return (uint32_t)-1;
172 }
173 }
174
175 /************************************************************************
176 Create the on-disk format (always v2 now). Caller must free.
177 ************************************************************************/
178
179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
180 canon_ace *dir_ace_list,
181 uint16_t sd_type,
182 size_t *store_size)
183 {
184 char *pai_buf = NULL;
185 canon_ace *ace_list = NULL;
186 char *entry_offset = NULL;
187 unsigned int num_entries = 0;
188 unsigned int num_def_entries = 0;
189 unsigned int i;
190
191 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
192 num_entries++;
193 }
194
195 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
196 num_def_entries++;
197 }
198
199 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
200
201 *store_size = PAI_V2_ENTRIES_BASE +
202 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
203
204 pai_buf = talloc_array(talloc_tos(), char, *store_size);
205 if (!pai_buf) {
206 return NULL;
207 }
208
209 /* Set up the header. */
210 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
211 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
212 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
213 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
214 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
215
216 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
217 (unsigned int)sd_type ));
218
219 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
220
221 i = 0;
222 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
223 uint8_t type_val = (uint8_t)ace_list->owner_type;
224 uint32_t entry_val = get_entry_val(ace_list);
225
226 SCVAL(entry_offset,0,ace_list->ace_flags);
227 SCVAL(entry_offset,1,type_val);
228 SIVAL(entry_offset,2,entry_val);
229 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
230 i,
231 (unsigned int)ace_list->ace_flags,
232 (unsigned int)type_val,
233 (unsigned int)entry_val ));
234 i++;
235 entry_offset += PAI_V2_ENTRY_LENGTH;
236 }
237
238 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
239 uint8_t type_val = (uint8_t)ace_list->owner_type;
240 uint32_t entry_val = get_entry_val(ace_list);
241
242 SCVAL(entry_offset,0,ace_list->ace_flags);
243 SCVAL(entry_offset,1,type_val);
244 SIVAL(entry_offset,2,entry_val);
245 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
246 i,
247 (unsigned int)ace_list->ace_flags,
248 (unsigned int)type_val,
249 (unsigned int)entry_val ));
250 i++;
251 entry_offset += PAI_V2_ENTRY_LENGTH;
252 }
253
254 return pai_buf;
255 }
256
257 /************************************************************************
258 Store the user.SAMBA_PAI attribute on disk.
259 ************************************************************************/
260
261 static void store_inheritance_attributes(files_struct *fsp,
262 canon_ace *file_ace_list,
263 canon_ace *dir_ace_list,
264 uint16_t sd_type)
265 {
266 int ret;
267 size_t store_size;
268 char *pai_buf;
269
270 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
271 return;
272 }
273
274 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
275 sd_type, &store_size);
276
277 if (fsp->fh->fd != -1) {
278 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
279 pai_buf, store_size, 0);
280 } else {
281 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
282 SAMBA_POSIX_INHERITANCE_EA_NAME,
283 pai_buf, store_size, 0);
284 }
285
286 TALLOC_FREE(pai_buf);
287
288 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
289 (unsigned int)sd_type,
290 fsp_str_dbg(fsp)));
291
292 if (ret == -1 && !no_acl_syscall_error(errno)) {
293 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
294 }
295 }
296
297 /************************************************************************
298 Delete the in memory inheritance info.
299 ************************************************************************/
300
301 static void free_inherited_info(struct pai_val *pal)
302 {
303 if (pal) {
304 struct pai_entry *paie, *paie_next;
305 for (paie = pal->entry_list; paie; paie = paie_next) {
306 paie_next = paie->next;
307 TALLOC_FREE(paie);
308 }
309 for (paie = pal->def_entry_list; paie; paie = paie_next) {
310 paie_next = paie->next;
311 TALLOC_FREE(paie);
312 }
313 TALLOC_FREE(pal);
314 }
315 }
316
317 /************************************************************************
318 Get any stored ACE flags.
319 ************************************************************************/
320
321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
322 {
323 struct pai_entry *paie;
324
325 if (!pal) {
326 return 0;
327 }
328
329 /* If the entry exists it is inherited. */
330 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
331 if (ace_entry->owner_type == paie->owner_type &&
332 get_entry_val(ace_entry) == get_pai_entry_val(paie))
333 return paie->ace_flags;
334 }
335 return 0;
336 }
337
338 /************************************************************************
339 Ensure an attribute just read is valid - v1.
340 ************************************************************************/
341
342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
343 {
344 uint16 num_entries;
345 uint16 num_def_entries;
346
347 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
348 /* Corrupted - too small. */
349 return false;
350 }
351
352 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
353 return false;
354 }
355
356 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
357 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
358
359 /* Check the entry lists match. */
360 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
361
362 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
363 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
364 return false;
365 }
366
367 return true;
368 }
369
370 /************************************************************************
371 Ensure an attribute just read is valid - v2.
372 ************************************************************************/
373
374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
375 {
376 uint16 num_entries;
377 uint16 num_def_entries;
378
379 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
380 /* Corrupted - too small. */
381 return false;
382 }
383
384 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
385 return false;
386 }
387
388 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
389 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
390
391 /* Check the entry lists match. */
392 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
393
394 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
395 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
396 return false;
397 }
398
399 return true;
400 }
401
402 /************************************************************************
403 Decode the owner.
404 ************************************************************************/
405
406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
407 {
408 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
409 switch( paie->owner_type) {
410 case UID_ACE:
411 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
412 DEBUG(10,("get_pai_owner_type: uid = %u\n",
413 (unsigned int)paie->unix_ug.uid ));
414 break;
415 case GID_ACE:
416 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
417 DEBUG(10,("get_pai_owner_type: gid = %u\n",
418 (unsigned int)paie->unix_ug.gid ));
419 break;
420 case WORLD_ACE:
421 paie->unix_ug.world = -1;
422 DEBUG(10,("get_pai_owner_type: world ace\n"));
423 break;
424 default:
425 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
426 (unsigned int)paie->owner_type ));
427 return false;
428 }
429 return true;
430 }
431
432 /************************************************************************
433 Process v2 entries.
434 ************************************************************************/
435
436 static const char *create_pai_v1_entries(struct pai_val *paiv,
437 const char *entry_offset,
438 bool def_entry)
439 {
440 int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 const char *u_name = uidtoname(pace->unix_ug.uid);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.gid);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
866
867 return ret;
868 }
869
870 /****************************************************************************
871 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
872 ****************************************************************************/
873
874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
875 {
876 mode_t ret = 0;
877
878 if (mode & r_mask)
879 ret |= S_IRUSR;
880 if (mode & w_mask)
881 ret |= S_IWUSR;
882 if (mode & x_mask)
883 ret |= S_IXUSR;
884
885 return ret;
886 }
887
888 /****************************************************************************
889 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
890 an SMB_ACL_PERMSET_T.
891 ****************************************************************************/
892
893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
907 return -1;
908 }
909 return 0;
910 }
911
912 /****************************************************************************
913 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
914 ****************************************************************************/
915
916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same. */
953
954 if (!dir_acl) {
955 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
956 (curr_ace->attr == curr_ace_outer->attr));
957 } else {
958 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
959 (curr_ace->type == curr_ace_outer->type) &&
960 (curr_ace->attr == curr_ace_outer->attr));
961 }
962
963 if (can_merge) {
964 if( DEBUGLVL( 10 )) {
965 dbgtext("merge_aces: Merging ACE's\n");
966 print_canon_ace( curr_ace_outer, 0);
967 print_canon_ace( curr_ace, 0);
968 }
969
970 /* Merge two allow or two deny ACE's. */
971
972 /* Theoretically we shouldn't merge a dir ACE if
973 * one ACE has the CI flag set, and the other
974 * ACE has the OI flag set, but this is rare
975 * enough we can ignore it. */
976
977 curr_ace_outer->perms |= curr_ace->perms;
978 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
979 DLIST_REMOVE(l_head, curr_ace);
980 TALLOC_FREE(curr_ace);
981 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
982 }
983 }
984 }
985
986 /*
987 * Now go through and mask off allow permissions with deny permissions.
988 * We can delete either the allow or deny here as we know that each SID
989 * appears only once in the list.
990 */
991
992 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
993 canon_ace *curr_ace;
994 canon_ace *curr_ace_next;
995
996 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
997
998 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
999
1000 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002 /*
1003 * Subtract ACE's with different entries. Due to the ordering constraints
1004 * we've put on the ACL, we know the deny must be the first one.
1005 */
1006
1007 if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010 if( DEBUGLVL( 10 )) {
1011 dbgtext("merge_aces: Masking ACE's\n");
1012 print_canon_ace( curr_ace_outer, 0);
1013 print_canon_ace( curr_ace, 0);
1014 }
1015
1016 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018 if (curr_ace->perms == 0) {
1019
1020 /*
1021 * The deny overrides the allow. Remove the allow.
1022 */
1023
1024 DLIST_REMOVE(l_head, curr_ace);
1025 TALLOC_FREE(curr_ace);
1026 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028 } else {
1029
1030 /*
1031 * Even after removing permissions, there
1032 * are still allow permissions - delete the deny.
1033 * It is safe to delete the deny here,
1034 * as we are guarenteed by the deny first
1035 * ordering that all the deny entries for
1036 * this SID have already been merged into one
1037 * before we can get to an allow ace.
1038 */
1039
1040 DLIST_REMOVE(l_head, curr_ace_outer);
1041 TALLOC_FREE(curr_ace_outer);
1042 break;
1043 }
1044 }
1045
1046 } /* end for curr_ace */
1047 } /* end for curr_ace_outer */
1048
1049 /* We may have modified the list. */
1050
1051 *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055 Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060 int compat = lp_acl_compatibility();
1061
1062 if (compat == ACL_COMPAT_AUTO) {
1063 enum remote_arch_types ra_type = get_remote_arch();
1064
1065 /* Automatically adapt to client */
1066 return (ra_type <= RA_WINNT);
1067 } else
1068 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073 Map canon_ace perms to permission bits NT.
1074 The attr element is not used here - we only process deny entries on set,
1075 not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079 enum security_ace_type *pacl_type,
1080 mode_t perms,
1081 bool directory_ace)
1082 {
1083 uint32_t nt_mask = 0;
1084
1085 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088 if (directory_ace) {
1089 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090 } else {
1091 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092 }
1093 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094 /*
1095 * Windows NT refuses to display ACEs with no permissions in them (but
1096 * they are perfectly legal with Windows 2000). If the ACE has empty
1097 * permissions we cannot use 0, so we use the otherwise unused
1098 * WRITE_OWNER permission, which we ignore when we set an ACL.
1099 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100 * to be changed in the future.
1101 */
1102
1103 if (nt4_compatible_acls())
1104 nt_mask = UNIX_ACCESS_NONE;
1105 else
1106 nt_mask = 0;
1107 } else {
1108 if (directory_ace) {
1109 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112 } else {
1113 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116 }
1117 }
1118
1119 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121 }
1122
1123 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124 (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126 return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130 Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139 mode_t mode = 0;
1140
1141 switch(type) {
1142 case S_IRUSR:
1143 if((*mask) & GENERIC_ALL_ACCESS)
1144 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145 else {
1146 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149 }
1150 break;
1151 case S_IRGRP:
1152 if((*mask) & GENERIC_ALL_ACCESS)
1153 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154 else {
1155 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158 }
1159 break;
1160 case S_IROTH:
1161 if((*mask) & GENERIC_ALL_ACCESS)
1162 mode = S_IROTH|S_IWOTH|S_IXOTH;
1163 else {
1164 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167 }
1168 break;
1169 }
1170
1171 return mode;
1172 }
1173
1174 /****************************************************************************
1175 Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179 uid_t *puser, gid_t *pgrp,
1180 uint32 security_info_sent, const struct
1181 security_descriptor *psd)
1182 {
1183 struct dom_sid owner_sid;
1184 struct dom_sid grp_sid;
1185
1186 *puser = (uid_t)-1;
1187 *pgrp = (gid_t)-1;
1188
1189 if(security_info_sent == 0) {
1190 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191 return NT_STATUS_OK;
1192 }
1193
1194 /*
1195 * Validate the owner and group SID's.
1196 */
1197
1198 memset(&owner_sid, '\0', sizeof(owner_sid));
1199 memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203 /*
1204 * Don't immediately fail if the owner sid cannot be validated.
1205 * This may be a group chown only set.
1206 */
1207
1208 if (security_info_sent & SECINFO_OWNER) {
1209 sid_copy(&owner_sid, psd->owner_sid);
1210 if (!sid_to_uid(&owner_sid, puser)) {
1211 if (lp_force_unknown_acl_user(SNUM(conn))) {
1212 /* this allows take ownership to work
1213 * reasonably */
1214 *puser = get_current_uid(conn);
1215 } else {
1216 DEBUG(3,("unpack_nt_owners: unable to validate"
1217 " owner sid for %s\n",
1218 sid_string_dbg(&owner_sid)));
1219 return NT_STATUS_INVALID_OWNER;
1220 }
1221 }
1222 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223 (unsigned int)*puser ));
1224 }
1225
1226 /*
1227 * Don't immediately fail if the group sid cannot be validated.
1228 * This may be an owner chown only set.
1229 */
1230
1231 if (security_info_sent & SECINFO_GROUP) {
1232 sid_copy(&grp_sid, psd->group_sid);
1233 if (!sid_to_gid( &grp_sid, pgrp)) {
1234 if (lp_force_unknown_acl_user(SNUM(conn))) {
1235 /* this allows take group ownership to work
1236 * reasonably */
1237 *pgrp = get_current_gid(conn);
1238 } else {
1239 DEBUG(3,("unpack_nt_owners: unable to validate"
1240 " group sid.\n"));
1241 return NT_STATUS_INVALID_OWNER;
1242 }
1243 }
1244 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245 (unsigned int)*pgrp));
1246 }
1247
1248 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250 return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254 Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258 const bool is_directory, canon_ace *pace,
1259 mode_t type)
1260 {
1261 mode_t and_bits = (mode_t)0;
1262 mode_t or_bits = (mode_t)0;
1263
1264 /* Get the initial bits to apply. */
1265
1266 if (is_directory) {
1267 and_bits = lp_dir_security_mask(params->service);
1268 or_bits = lp_force_dir_security_mode(params->service);
1269 } else {
1270 and_bits = lp_security_mask(params->service);
1271 or_bits = lp_force_security_mode(params->service);
1272 }
1273
1274 /* Now bounce them into the S_USR space. */
1275 switch(type) {
1276 case S_IRUSR:
1277 /* Ensure owner has read access. */
1278 pace->perms |= S_IRUSR;
1279 if (is_directory)
1280 pace->perms |= (S_IWUSR|S_IXUSR);
1281 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283 break;
1284 case S_IRGRP:
1285 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287 break;
1288 case S_IROTH:
1289 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291 break;
1292 }
1293
1294 pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298 Check if a given uid/SID is in a group gid/SID. This is probably very
1299 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304 const char *u_name = NULL;
1305
1306 /* "Everyone" always matches every uid. */
1307
1308 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309 return True;
1310
1311 /*
1312 * if it's the current user, we already have the unix token
1313 * and don't need to do the complex user_in_group_sid() call
1314 */
1315 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316 const struct security_unix_token *curr_utok = NULL;
1317 size_t i;
1318
1319 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320 return True;
1321 }
1322
1323 curr_utok = get_current_utok(conn);
1324 for (i=0; i < curr_utok->ngroups; i++) {
1325 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326 return True;
1327 }
1328 }
1329 }
1330
1331 /* u_name talloc'ed off tos. */
1332 u_name = uidtoname(uid_ace->unix_ug.uid);
1333 if (!u_name) {
1334 return False;
1335 }
1336
1337 /*
1338 * user_in_group_sid() uses create_token_from_username()
1339 * which creates an artificial NT token given just a username,
1340 * so this is not reliable for users from foreign domains
1341 * exported by winbindd!
1342 */
1343 return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347 A well formed POSIX file or default ACL has at least 3 entries, a
1348 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349 In addition, the owner must always have at least read access.
1350 When using this call on get_acl, the pst struct is valid and contains
1351 the mode of the file. When using this call on set_acl, the pst struct has
1352 been modified to have a mode containing the default for this file or directory
1353 type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357 const struct share_params *params,
1358 const bool is_directory,
1359 const struct dom_sid *pfile_owner_sid,
1360 const struct dom_sid *pfile_grp_sid,
1361 const SMB_STRUCT_STAT *pst,
1362 bool setting_acl)
1363 {
1364 canon_ace *pace;
1365 canon_ace *pace_user = NULL;
1366 canon_ace *pace_group = NULL;
1367 canon_ace *pace_other = NULL;
1368
1369 for (pace = *pp_ace; pace; pace = pace->next) {
1370 if (pace->type == SMB_ACL_USER_OBJ) {
1371
1372 if (setting_acl)
1373 apply_default_perms(params, is_directory, pace, S_IRUSR);
1374 pace_user = pace;
1375
1376 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1377
1378 /*
1379 * Ensure create mask/force create mode is respected on set.
1380 */
1381
1382 if (setting_acl)
1383 apply_default_perms(params, is_directory, pace, S_IRGRP);
1384 pace_group = pace;
1385
1386 } else if (pace->type == SMB_ACL_OTHER) {
1387
1388 /*
1389 * Ensure create mask/force create mode is respected on set.
1390 */
1391
1392 if (setting_acl)
1393 apply_default_perms(params, is_directory, pace, S_IROTH);
1394 pace_other = pace;
1395 }
1396 }
1397
1398 if (!pace_user) {
1399 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1400 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1401 return False;
1402 }
1403
1404 ZERO_STRUCTP(pace);
1405 pace->type = SMB_ACL_USER_OBJ;
1406 pace->owner_type = UID_ACE;
1407 pace->unix_ug.uid = pst->st_ex_uid;
1408 pace->trustee = *pfile_owner_sid;
1409 pace->attr = ALLOW_ACE;
1410 /* Start with existing permissions, principle of least
1411 surprises for the user. */
1412 pace->perms = pst->st_ex_mode;
1413
1414 if (setting_acl) {
1415 /* See if the owning user is in any of the other groups in
1416 the ACE, or if there's a matching user entry.
1417 If so, OR in the permissions from that entry. */
1418
1419 canon_ace *pace_iter;
1420
1421 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1422 if (pace_iter->type == SMB_ACL_USER &&
1423 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1424 pace->perms |= pace_iter->perms;
1425 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1426 if (uid_entry_in_group(conn, pace, pace_iter)) {
1427 pace->perms |= pace_iter->perms;
1428 }
1429 }
1430 }
1431
1432 if (pace->perms == 0) {
1433 /* If we only got an "everyone" perm, just use that. */
1434 if (pace_other)
1435 pace->perms = pace_other->perms;
1436 }
1437
1438 apply_default_perms(params, is_directory, pace, S_IRUSR);
1439 } else {
1440 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1441 }
1442
1443 DLIST_ADD(*pp_ace, pace);
1444 pace_user = pace;
1445 }
1446
1447 if (!pace_group) {
1448 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1449 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1450 return False;
1451 }
1452
1453 ZERO_STRUCTP(pace);
1454 pace->type = SMB_ACL_GROUP_OBJ;
1455 pace->owner_type = GID_ACE;
1456 pace->unix_ug.gid = pst->st_ex_gid;
1457 pace->trustee = *pfile_grp_sid;
1458 pace->attr = ALLOW_ACE;
1459 if (setting_acl) {
1460 /* If we only got an "everyone" perm, just use that. */
1461 if (pace_other)
1462 pace->perms = pace_other->perms;
1463 else
1464 pace->perms = 0;
1465 apply_default_perms(params, is_directory, pace, S_IRGRP);
1466 } else {
1467 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1468 }
1469
1470 DLIST_ADD(*pp_ace, pace);
1471 pace_group = pace;
1472 }
1473
1474 if (!pace_other) {
1475 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1476 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477 return False;
1478 }
1479
1480 ZERO_STRUCTP(pace);
1481 pace->type = SMB_ACL_OTHER;
1482 pace->owner_type = WORLD_ACE;
1483 pace->unix_ug.world = -1;
1484 pace->trustee = global_sid_World;
1485 pace->attr = ALLOW_ACE;
1486 if (setting_acl) {
1487 pace->perms = 0;
1488 apply_default_perms(params, is_directory, pace, S_IROTH);
1489 } else
1490 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492 DLIST_ADD(*pp_ace, pace);
1493 pace_other = pace;
1494 }
1495
1496 if (setting_acl) {
1497 /* Ensure when setting a POSIX ACL, that the uid for a
1498 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1499 permission entry as an SMB_ACL_USER, and a gid for a
1500 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1501 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1502 then if the ownership or group ownership of this file or
1503 directory gets changed, the user or group can lose their
1504 access. */
1505
1506 for (pace = *pp_ace; pace; pace = pace->next) {
1507 if (pace->type == SMB_ACL_USER &&
1508 pace->unix_ug.uid == pace_user->unix_ug.uid) {
1509 /* Already got one. */
1510 pace_user = NULL;
1511 } else if (pace->type == SMB_ACL_USER &&
1512 pace->unix_ug.uid == pace_user->unix_ug.uid) {
1513 /* Already got one. */
1514 pace_group = NULL;
1515 }
1516 }
1517
1518 if (pace_user) {
1519 /* Add a duplicate SMB_ACL_USER entry. */
1520 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1521 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1522 return false;
1523 }
1524
1525 ZERO_STRUCTP(pace);
1526 pace->type = SMB_ACL_USER;;
1527 pace->owner_type = UID_ACE;
1528 pace->unix_ug.uid = pace_user->unix_ug.uid;
1529 pace->trustee = pace_user->trustee;
1530 pace->attr = pace_user->attr;
1531 pace->perms = pace_user->perms;
1532
1533 DLIST_ADD(*pp_ace, pace);
1534 }
1535
1536 if (pace_group) {
1537 /* Add a duplicate SMB_ACL_GROUP entry. */
1538 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1539 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1540 return false;
1541 }
1542
1543 ZERO_STRUCTP(pace);
1544 pace->type = SMB_ACL_GROUP;;
1545 pace->owner_type = GID_ACE;
1546 pace->unix_ug.gid = pace_group->unix_ug.gid;
1547 pace->trustee = pace_group->trustee;
1548 pace->attr = pace_group->attr;
1549 pace->perms = pace_group->perms;
1550
1551 DLIST_ADD(*pp_ace, pace);
1552 }
1553
1554 }
1555
1556 return True;
1557 }
1558
1559 /****************************************************************************
1560 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1561 If it does not have them, check if there are any entries where the trustee is the
1562 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1563 Note we must not do this to default directory ACLs.
1564 ****************************************************************************/
1565
1566 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1567 {
1568 bool got_user_obj, got_group_obj;
1569 canon_ace *current_ace;
1570 int i, entries;
1571
1572 entries = count_canon_ace_list(ace);
1573 got_user_obj = False;
1574 got_group_obj = False;
1575
1576 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1577 if (current_ace->type == SMB_ACL_USER_OBJ)
1578 got_user_obj = True;
1579 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1580 got_group_obj = True;
1581 }
1582 if (got_user_obj && got_group_obj) {
1583 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1584 return;
1585 }
1586
1587 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1588 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1589 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1590 current_ace->type = SMB_ACL_USER_OBJ;
1591 got_user_obj = True;
1592 }
1593 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1594 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1595 current_ace->type = SMB_ACL_GROUP_OBJ;
1596 got_group_obj = True;
1597 }
1598 }
1599 if (!got_user_obj)
1600 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1601 if (!got_group_obj)
1602 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1603 }
1604
1605 /****************************************************************************
1606 Unpack a struct security_descriptor into two canonical ace lists.
1607 ****************************************************************************/
1608
1609 static bool create_canon_ace_lists(files_struct *fsp,
1610 const SMB_STRUCT_STAT *pst,
1611 struct dom_sid *pfile_owner_sid,
1612 struct dom_sid *pfile_grp_sid,
1613 canon_ace **ppfile_ace,
1614 canon_ace **ppdir_ace,
1615 const struct security_acl *dacl)
1616 {
1617 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1618 canon_ace *file_ace = NULL;
1619 canon_ace *dir_ace = NULL;
1620 canon_ace *current_ace = NULL;
1621 bool got_dir_allow = False;
1622 bool got_file_allow = False;
1623 int i, j;
1624
1625 *ppfile_ace = NULL;
1626 *ppdir_ace = NULL;
1627
1628 /*
1629 * Convert the incoming ACL into a more regular form.
1630 */
1631
1632 for(i = 0; i < dacl->num_aces; i++) {
1633 struct security_ace *psa = &dacl->aces[i];
1634
1635 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1636 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1637 return False;
1638 }
1639
1640 if (nt4_compatible_acls()) {
1641 /*
1642 * The security mask may be UNIX_ACCESS_NONE which should map into
1643 * no permissions (we overload the WRITE_OWNER bit for this) or it
1644 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1645 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1646 */
1647
1648 /*
1649 * Convert GENERIC bits to specific bits.
1650 */
1651
1652 se_map_generic(&psa->access_mask, &file_generic_mapping);
1653
1654 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1655
1656 if(psa->access_mask != UNIX_ACCESS_NONE)
1657 psa->access_mask &= ~UNIX_ACCESS_NONE;
1658 }
1659 }
1660
1661 /*
1662 * Deal with the fact that NT 4.x re-writes the canonical format
1663 * that we return for default ACLs. If a directory ACE is identical
1664 * to a inherited directory ACE then NT changes the bits so that the
1665 * first ACE is set to OI|IO and the second ACE for this SID is set
1666 * to CI. We need to repair this. JRA.
1667 */
1668
1669 for(i = 0; i < dacl->num_aces; i++) {
1670 struct security_ace *psa1 = &dacl->aces[i];
1671
1672 for (j = i + 1; j < dacl->num_aces; j++) {
1673 struct security_ace *psa2 = &dacl->aces[j];
1674
1675 if (psa1->access_mask != psa2->access_mask)
1676 continue;
1677
1678 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1679 continue;
1680
1681 /*
1682 * Ok - permission bits and SIDs are equal.
1683 * Check if flags were re-written.
1684 */
1685
1686 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1687
1688 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1689 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1690
1691 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1692
1693 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1694 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1695
1696 }
1697 }
1698 }
1699
1700 for(i = 0; i < dacl->num_aces; i++) {
1701 struct security_ace *psa = &dacl->aces[i];
1702
1703 /*
1704 * Create a canon_ace entry representing this NT DACL ACE.
1705 */
1706
1707 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1708 free_canon_ace_list(file_ace);
1709 free_canon_ace_list(dir_ace);
1710 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1711 return False;
1712 }
1713
1714 ZERO_STRUCTP(current_ace);
1715
1716 sid_copy(&current_ace->trustee, &psa->trustee);
1717
1718 /*
1719 * Try and work out if the SID is a user or group
1720 * as we need to flag these differently for POSIX.
1721 * Note what kind of a POSIX ACL this should map to.
1722 */
1723
1724 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1725 current_ace->owner_type = WORLD_ACE;
1726 current_ace->unix_ug.world = -1;
1727 current_ace->type = SMB_ACL_OTHER;
1728 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1729 current_ace->owner_type = UID_ACE;
1730 current_ace->unix_ug.uid = pst->st_ex_uid;
1731 current_ace->type = SMB_ACL_USER_OBJ;
1732
1733 /*
1734 * The Creator Owner entry only specifies inheritable permissions,
1735 * never access permissions. WinNT doesn't always set the ACE to
1736 * INHERIT_ONLY, though.
1737 */
1738
1739 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1740
1741 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1742 current_ace->owner_type = GID_ACE;
1743 current_ace->unix_ug.gid = pst->st_ex_gid;
1744 current_ace->type = SMB_ACL_GROUP_OBJ;
1745
1746 /*
1747 * The Creator Group entry only specifies inheritable permissions,
1748 * never access permissions. WinNT doesn't always set the ACE to
1749 * INHERIT_ONLY, though.
1750 */
1751 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1752
1753 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1754 current_ace->owner_type = UID_ACE;
1755 /* If it's the owning user, this is a user_obj, not
1756 * a user. */
1757 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1758 current_ace->type = SMB_ACL_USER_OBJ;
1759 } else {
1760 current_ace->type = SMB_ACL_USER;
1761 }
1762 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1763 current_ace->owner_type = GID_ACE;
1764 /* If it's the primary group, this is a group_obj, not
1765 * a group. */
1766 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1767 current_ace->type = SMB_ACL_GROUP_OBJ;
1768 } else {
1769 current_ace->type = SMB_ACL_GROUP;
1770 }
1771 } else {
1772 /*
1773 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1774 */
1775
1776 if (non_mappable_sid(&psa->trustee)) {
1777 DEBUG(10, ("create_canon_ace_lists: ignoring "
1778 "non-mappable SID %s\n",
1779 sid_string_dbg(&psa->trustee)));
1780 TALLOC_FREE(current_ace);
1781 continue;
1782 }
1783
1784 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1785 DEBUG(10, ("create_canon_ace_lists: ignoring "
1786 "unknown or foreign SID %s\n",
1787 sid_string_dbg(&psa->trustee)));
1788 TALLOC_FREE(current_ace);
1789 continue;
1790 }
1791
1792 free_canon_ace_list(file_ace);
1793 free_canon_ace_list(dir_ace);
1794 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1795 "%s to uid or gid.\n",
1796 sid_string_dbg(&current_ace->trustee)));
1797 TALLOC_FREE(current_ace);
1798 return False;
1799 }
1800
1801 /*
1802 * Map the given NT permissions into a UNIX mode_t containing only
1803 * S_I(R|W|X)USR bits.
1804 */
1805
1806 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1807 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1808
1809 /* Store the ace_flag. */
1810 current_ace->ace_flags = psa->flags;
1811
1812 /*
1813 * Now add the created ace to either the file list, the directory
1814 * list, or both. We *MUST* preserve the order here (hence we use
1815 * DLIST_ADD_END) as NT ACLs are order dependent.
1816 */
1817
1818 if (fsp->is_directory) {
1819
1820 /*
1821 * We can only add to the default POSIX ACE list if the ACE is
1822 * designed to be inherited by both files and directories.
1823 */
1824
1825 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1826 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1827
1828 canon_ace *current_dir_ace = current_ace;
1829 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1830
1831 /*
1832 * Note if this was an allow ace. We can't process
1833 * any further deny ace's after this.
1834 */
1835
1836 if (current_ace->attr == ALLOW_ACE)
1837 got_dir_allow = True;
1838
1839 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1840 DEBUG(0,("create_canon_ace_lists: "
1841 "malformed ACL in "
1842 "inheritable ACL! Deny entry "
1843 "after Allow entry. Failing "
1844 "to set on file %s.\n",
1845 fsp_str_dbg(fsp)));
1846 free_canon_ace_list(file_ace);
1847 free_canon_ace_list(dir_ace);
1848 return False;
1849 }
1850
1851 if( DEBUGLVL( 10 )) {
1852 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1853 print_canon_ace( current_ace, 0);
1854 }
1855
1856 /*
1857 * If this is not an inherit only ACE we need to add a duplicate
1858 * to the file acl.
1859 */
1860
1861 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1862 canon_ace *dup_ace = dup_canon_ace(current_ace);
1863
1864 if (!dup_ace) {
1865 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1866 free_canon_ace_list(file_ace);
1867 free_canon_ace_list(dir_ace);
1868 return False;
1869 }
1870
1871 /*
1872 * We must not free current_ace here as its
1873 * pointer is now owned by the dir_ace list.
1874 */
1875 current_ace = dup_ace;
1876 /* We've essentially split this ace into two,
1877 * and added the ace with inheritance request
1878 * bits to the directory ACL. Drop those bits for
1879 * the ACE we're adding to the file list. */
1880 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1881 SEC_ACE_FLAG_CONTAINER_INHERIT|
1882 SEC_ACE_FLAG_INHERIT_ONLY);
1883 } else {
1884 /*
1885 * We must not free current_ace here as its
1886 * pointer is now owned by the dir_ace list.
1887 */
1888 current_ace = NULL;
1889 }
1890
1891 /*
1892 * current_ace is now either owned by file_ace
1893 * or is NULL. We can safely operate on current_dir_ace
1894 * to treat mapping for default acl entries differently
1895 * than access acl entries.
1896 */
1897
1898 if (current_dir_ace->owner_type == UID_ACE) {
1899 /*
1900 * We already decided above this is a uid,
1901 * for default acls ace's only CREATOR_OWNER
1902 * maps to ACL_USER_OBJ. All other uid
1903 * ace's are ACL_USER.
1904 */
1905 if (dom_sid_equal(&current_dir_ace->trustee,
1906 &global_sid_Creator_Owner)) {
1907 current_dir_ace->type = SMB_ACL_USER_OBJ;
1908 } else {
1909 current_dir_ace->type = SMB_ACL_USER;
1910 }
1911 }
1912
1913 if (current_dir_ace->owner_type == GID_ACE) {
1914 /*
1915 * We already decided above this is a gid,
1916 * for default acls ace's only CREATOR_GROUP
1917 * maps to ACL_GROUP_OBJ. All other uid
1918 * ace's are ACL_GROUP.
1919 */
1920 if (dom_sid_equal(&current_dir_ace->trustee,
1921 &global_sid_Creator_Group)) {
1922 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1923 } else {
1924 current_dir_ace->type = SMB_ACL_GROUP;
1925 }
1926 }
1927 }
1928 }
1929
1930 /*
1931 * Only add to the file ACL if not inherit only.
1932 */
1933
1934 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1935 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1936
1937 /*
1938 * Note if this was an allow ace. We can't process
1939 * any further deny ace's after this.
1940 */
1941
1942 if (current_ace->attr == ALLOW_ACE)
1943 got_file_allow = True;
1944
1945 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1946 DEBUG(0,("create_canon_ace_lists: malformed "
1947 "ACL in file ACL ! Deny entry after "
1948 "Allow entry. Failing to set on file "
1949 "%s.\n", fsp_str_dbg(fsp)));
1950 free_canon_ace_list(file_ace);
1951 free_canon_ace_list(dir_ace);
1952 return False;
1953 }
1954
1955 if( DEBUGLVL( 10 )) {
1956 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1957 print_canon_ace( current_ace, 0);
1958 }
1959 all_aces_are_inherit_only = False;
1960 /*
1961 * We must not free current_ace here as its
1962 * pointer is now owned by the file_ace list.
1963 */
1964 current_ace = NULL;
1965 }
1966
1967 /*
1968 * Free if ACE was not added.
1969 */
1970
1971 TALLOC_FREE(current_ace);
1972 }
1973
1974 if (fsp->is_directory && all_aces_are_inherit_only) {
1975 /*
1976 * Windows 2000 is doing one of these weird 'inherit acl'
1977 * traverses to conserve NTFS ACL resources. Just pretend
1978 * there was no DACL sent. JRA.
1979 */
1980
1981 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1982 free_canon_ace_list(file_ace);
1983 free_canon_ace_list(dir_ace);
1984 file_ace = NULL;
1985 dir_ace = NULL;
1986 } else {
1987 /*
1988 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1989 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1990 * entries can be converted to *_OBJ. Don't do this for the default
1991 * ACL, we will create them separately for this if needed inside
1992 * ensure_canon_entry_valid().
1993 */
1994 if (file_ace) {
1995 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1996 }
1997 }
1998
1999 *ppfile_ace = file_ace;
2000 *ppdir_ace = dir_ace;
2001
2002 return True;
2003 }
2004
2005 /****************************************************************************
2006 ASCII art time again... JRA :-).
2007
2008 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2009 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2010 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2011 allow or deny have been merged, so the same SID can only appear once in the deny
2012 list or once in the allow list.
2013
2014 We then process as follows :
2015
2016 ---------------------------------------------------------------------------
2017 First pass - look for a Everyone DENY entry.
2018
2019 If it is deny all (rwx) trunate the list at this point.
2020 Else, walk the list from this point and use the deny permissions of this
2021 entry as a mask on all following allow entries. Finally, delete
2022 the Everyone DENY entry (we have applied it to everything possible).
2023
2024 In addition, in this pass we remove any DENY entries that have
2025 no permissions (ie. they are a DENY nothing).
2026 ---------------------------------------------------------------------------
2027 Second pass - only deal with deny user entries.
2028
2029 DENY user1 (perms XXX)
2030
2031 new_perms = 0
2032 for all following allow group entries where user1 is in group
2033 new_perms |= group_perms;
2034
2035 user1 entry perms = new_perms & ~ XXX;
2036
2037 Convert the deny entry to an allow entry with the new perms and
2038 push to the end of the list. Note if the user was in no groups
2039 this maps to a specific allow nothing entry for this user.
2040
2041 The common case from the NT ACL choser (userX deny all) is
2042 optimised so we don't do the group lookup - we just map to
2043 an allow nothing entry.
2044
2045 What we're doing here is inferring the allow permissions the
2046 person setting the ACE on user1 wanted by looking at the allow
2047 permissions on the groups the user is currently in. This will
2048 be a snapshot, depending on group membership but is the best
2049 we can do and has the advantage of failing closed rather than
2050 open.
2051 ---------------------------------------------------------------------------
2052 Third pass - only deal with deny group entries.
2053
2054 DENY group1 (perms XXX)
2055
2056 for all following allow user entries where user is in group1
2057 user entry perms = user entry perms & ~ XXX;
2058
2059 If there is a group Everyone allow entry with permissions YYY,
2060 convert the group1 entry to an allow entry and modify its
2061 permissions to be :
2062
2063 new_perms = YYY & ~ XXX
2064
2065 and push to the end of the list.
2066
2067 If there is no group Everyone allow entry then convert the
2068 group1 entry to a allow nothing entry and push to the end of the list.
2069
2070 Note that the common case from the NT ACL choser (groupX deny all)
2071 cannot be optimised here as we need to modify user entries who are
2072 in the group to change them to a deny all also.
2073
2074 What we're doing here is modifying the allow permissions of
2075 user entries (which are more specific in POSIX ACLs) to mask
2076 out the explicit deny set on the group they are in. This will
2077 be a snapshot depending on current group membership but is the
2078 best we can do and has the advantage of failing closed rather
2079 than open.
2080 ---------------------------------------------------------------------------
2081 Fourth pass - cope with cumulative permissions.
2082
2083 for all allow user entries, if there exists an allow group entry with
2084 more permissive permissions, and the user is in that group, rewrite the
2085 allow user permissions to contain both sets of permissions.
2086
2087 Currently the code for this is #ifdef'ed out as these semantics make
2088 no sense to me. JRA.
2089 ---------------------------------------------------------------------------
2090
2091 Note we *MUST* do the deny user pass first as this will convert deny user
2092 entries into allow user entries which can then be processed by the deny
2093 group pass.
2094
2095 The above algorithm took a *lot* of thinking about - hence this
2096 explaination :-). JRA.
2097 ****************************************************************************/
2098
2099 /****************************************************************************
2100 Process a canon_ace list entries. This is very complex code. We need
2101 to go through and remove the "deny" permissions from any allow entry that matches
2102 the id of this entry. We have already refused any NT ACL that wasn't in correct
2103 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2104 we just remove it (to fail safe). We have already removed any duplicate ace
2105 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2106 allow entries.
2107 ****************************************************************************/
2108
2109 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2110 {
2111 canon_ace *ace_list = *pp_ace_list;
2112 canon_ace *curr_ace = NULL;
2113 canon_ace *curr_ace_next = NULL;
2114
2115 /* Pass 1 above - look for an Everyone, deny entry. */
2116
2117 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2118 canon_ace *allow_ace_p;
2119
2120 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2121
2122 if (curr_ace->attr != DENY_ACE)
2123 continue;
2124
2125 if (curr_ace->perms == (mode_t)0) {
2126
2127 /* Deny nothing entry - delete. */
2128
2129 DLIST_REMOVE(ace_list, curr_ace);
2130 continue;
2131 }
2132
2133 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2134 continue;
2135
2136 /* JRATEST - assert. */
2137 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2138
2139 if (curr_ace->perms == ALL_ACE_PERMS) {
2140
2141 /*
2142 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2143 * list at this point including this entry.
2144 */
2145
2146 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2147
2148 free_canon_ace_list( curr_ace );
2149 if (prev_entry)
2150 DLIST_REMOVE(ace_list, prev_entry);
2151 else {
2152 /* We deleted the entire list. */
2153 ace_list = NULL;
2154 }
2155 break;
2156 }
2157
2158 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2159
2160 /*
2161 * Only mask off allow entries.
2162 */
2163
2164 if (allow_ace_p->attr != ALLOW_ACE)
2165 continue;
2166
2167 allow_ace_p->perms &= ~curr_ace->perms;
2168 }
2169
2170 /*
2171 * Now it's been applied, remove it.
2172 */
2173
2174 DLIST_REMOVE(ace_list, curr_ace);
2175 }
2176
2177 /* Pass 2 above - deal with deny user entries. */
2178
2179 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2180 mode_t new_perms = (mode_t)0;
2181 canon_ace *allow_ace_p;
2182
2183 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2184
2185 if (curr_ace->attr != DENY_ACE)
2186 continue;
2187
2188 if (curr_ace->owner_type != UID_ACE)
2189 continue;
2190
2191 if (curr_ace->perms == ALL_ACE_PERMS) {
2192
2193 /*
2194 * Optimisation - this is a deny everything to this user.
2195 * Convert to an allow nothing and push to the end of the list.
2196 */
2197
2198 curr_ace->attr = ALLOW_ACE;
2199 curr_ace->perms = (mode_t)0;
2200 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2201 continue;
2202 }
2203
2204 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2205
2206 if (allow_ace_p->attr != ALLOW_ACE)
2207 continue;
2208
2209 /* We process GID_ACE and WORLD_ACE entries only. */
2210
2211 if (allow_ace_p->owner_type == UID_ACE)
2212 continue;
2213
2214 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2215 new_perms |= allow_ace_p->perms;
2216 }
2217
2218 /*
2219 * Convert to a allow entry, modify the perms and push to the end
2220 * of the list.
2221 */
2222
2223 curr_ace->attr = ALLOW_ACE;
2224 curr_ace->perms = (new_perms & ~curr_ace->perms);
2225 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2226 }
2227
2228 /* Pass 3 above - deal with deny group entries. */
2229
2230 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2231 canon_ace *allow_ace_p;
2232 canon_ace *allow_everyone_p = NULL;
2233
2234 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2235
2236 if (curr_ace->attr != DENY_ACE)
2237 continue;
2238
2239 if (curr_ace->owner_type != GID_ACE)
2240 continue;
2241
2242 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2243
2244 if (allow_ace_p->attr != ALLOW_ACE)
2245 continue;
2246
2247 /* Store a pointer to the Everyone allow, if it exists. */
2248 if (allow_ace_p->owner_type == WORLD_ACE)
2249 allow_everyone_p = allow_ace_p;
2250
2251 /* We process UID_ACE entries only. */
2252
2253 if (allow_ace_p->owner_type != UID_ACE)
2254 continue;
2255
2256 /* Mask off the deny group perms. */
2257
2258 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2259 allow_ace_p->perms &= ~curr_ace->perms;
2260 }
2261
2262 /*
2263 * Convert the deny to an allow with the correct perms and
2264 * push to the end of the list.
2265 */
2266
2267 curr_ace->attr = ALLOW_ACE;
2268 if (allow_everyone_p)
2269 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2270 else
2271 curr_ace->perms = (mode_t)0;
2272 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2273 }
2274
2275 /* Doing this fourth pass allows Windows semantics to be layered
2276 * on top of POSIX semantics. I'm not sure if this is desirable.
2277 * For example, in W2K ACLs there is no way to say, "Group X no
2278 * access, user Y full access" if user Y is a member of group X.
2279 * This seems completely broken semantics to me.... JRA.
2280 */
2281
2282 #if 0
2283 /* Pass 4 above - deal with allow entries. */
2284
2285 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2286 canon_ace *allow_ace_p;
2287
2288 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2289
2290 if (curr_ace->attr != ALLOW_ACE)
2291 continue;
2292
2293 if (curr_ace->owner_type != UID_ACE)
2294 continue;
2295
2296 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2297
2298 if (allow_ace_p->attr != ALLOW_ACE)
2299 continue;
2300
2301 /* We process GID_ACE entries only. */
2302
2303 if (allow_ace_p->owner_type != GID_ACE)
2304 continue;
2305
2306 /* OR in the group perms. */
2307
2308 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2309 curr_ace->perms |= allow_ace_p->perms;
2310 }
2311 }
2312 #endif
2313
2314 *pp_ace_list = ace_list;
2315 }
2316
2317 /****************************************************************************
2318 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2319 succeeding.
2320 ****************************************************************************/
2321
2322 static bool unpack_canon_ace(files_struct *fsp,
2323 const SMB_STRUCT_STAT *pst,
2324 struct dom_sid *pfile_owner_sid,
2325 struct dom_sid *pfile_grp_sid,
2326 canon_ace **ppfile_ace,
2327 canon_ace **ppdir_ace,
2328 uint32 security_info_sent,
2329 const struct security_descriptor *psd)
2330 {
2331 canon_ace *file_ace = NULL;
2332 canon_ace *dir_ace = NULL;
2333
2334 *ppfile_ace = NULL;
2335 *ppdir_ace = NULL;
2336
2337 if(security_info_sent == 0) {
2338 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2339 return False;
2340 }
2341
2342 /*
2343 * If no DACL then this is a chown only security descriptor.
2344 */
2345
2346 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2347 return True;
2348
2349 /*
2350 * Now go through the DACL and create the canon_ace lists.
2351 */
2352
2353 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2354 &file_ace, &dir_ace, psd->dacl))
2355 return False;
2356
2357 if ((file_ace == NULL) && (dir_ace == NULL)) {
2358 /* W2K traverse DACL set - ignore. */
2359 return True;
2360 }
2361
2362 /*
2363 * Go through the canon_ace list and merge entries
2364 * belonging to identical users of identical allow or deny type.
2365 * We can do this as all deny entries come first, followed by
2366 * all allow entries (we have mandated this before accepting this acl).
2367 */
2368
2369 print_canon_ace_list( "file ace - before merge", file_ace);
2370 merge_aces( &file_ace, false);
2371
2372 print_canon_ace_list( "dir ace - before merge", dir_ace);
2373 merge_aces( &dir_ace, true);
2374
2375 /*
2376 * NT ACLs are order dependent. Go through the acl lists and
2377 * process DENY entries by masking the allow entries.
2378 */
2379
2380 print_canon_ace_list( "file ace - before deny", file_ace);
2381 process_deny_list(fsp->conn, &file_ace);
2382
2383 print_canon_ace_list( "dir ace - before deny", dir_ace);
2384 process_deny_list(fsp->conn, &dir_ace);
2385
2386 /*
2387 * A well formed POSIX file or default ACL has at least 3 entries, a
2388 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2389 * and optionally a mask entry. Ensure this is the case.
2390 */
2391
2392 print_canon_ace_list( "file ace - before valid", file_ace);
2393
2394 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2395 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2396 free_canon_ace_list(file_ace);
2397 free_canon_ace_list(dir_ace);
2398 return False;
2399 }
2400
2401 print_canon_ace_list( "dir ace - before valid", dir_ace);
2402
2403 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2404 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2405 free_canon_ace_list(file_ace);
2406 free_canon_ace_list(dir_ace);
2407 return False;
2408 }
2409
2410 print_canon_ace_list( "file ace - return", file_ace);
2411 print_canon_ace_list( "dir ace - return", dir_ace);
2412
2413 *ppfile_ace = file_ace;
2414 *ppdir_ace = dir_ace;
2415 return True;
2416
2417 }
2418
2419 /******************************************************************************
2420 When returning permissions, try and fit NT display
2421 semantics if possible. Note the the canon_entries here must have been malloced.
2422 The list format should be - first entry = owner, followed by group and other user
2423 entries, last entry = other.
2424
2425 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2426 are not ordered, and match on the most specific entry rather than walking a list,
2427 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2428
2429 Entry 0: owner : deny all except read and write.
2430 Entry 1: owner : allow read and write.
2431 Entry 2: group : deny all except read.
2432 Entry 3: group : allow read.
2433 Entry 4: Everyone : allow read.
2434
2435 But NT cannot display this in their ACL editor !
2436 ********************************************************************************/
2437
2438 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2439 {
2440 canon_ace *l_head = *pp_list_head;
2441 canon_ace *owner_ace = NULL;
2442 canon_ace *other_ace = NULL;
2443 canon_ace *ace = NULL;
2444
2445 for (ace = l_head; ace; ace = ace->next) {
2446 if (ace->type == SMB_ACL_USER_OBJ)
2447 owner_ace = ace;
2448 else if (ace->type == SMB_ACL_OTHER) {
2449 /* Last ace - this is "other" */
2450 other_ace = ace;
2451 }
2452 }
2453
2454 if (!owner_ace || !other_ace) {
2455 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2456 filename ));
2457 return;
2458 }
2459
2460 /*
2461 * The POSIX algorithm applies to owner first, and other last,
2462 * so ensure they are arranged in this order.
2463 */
2464
2465 if (owner_ace) {
2466 DLIST_PROMOTE(l_head, owner_ace);
2467 }
2468
2469 if (other_ace) {
2470 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2471 }
2472
2473 /* We have probably changed the head of the list. */
2474
2475 *pp_list_head = l_head;
2476 }
2477
2478 /****************************************************************************
2479 Create a linked list of canonical ACE entries.
2480 ****************************************************************************/
2481
2482 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2483 const char *fname, SMB_ACL_T posix_acl,
2484 const SMB_STRUCT_STAT *psbuf,
2485 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2486 {
2487 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2488 canon_ace *l_head = NULL;
2489 canon_ace *ace = NULL;
2490 canon_ace *next_ace = NULL;
2491 int entry_id = SMB_ACL_FIRST_ENTRY;
2492 SMB_ACL_ENTRY_T entry;
2493 size_t ace_count;
2494
2495 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2496 SMB_ACL_TAG_T tagtype;
2497 SMB_ACL_PERMSET_T permset;
2498 struct dom_sid sid;
2499 posix_id unix_ug;
2500 enum ace_owner owner_type;
2501
2502 entry_id = SMB_ACL_NEXT_ENTRY;
2503
2504 /* Is this a MASK entry ? */
2505 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2506 continue;
2507
2508 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2509 continue;
2510
2511 /* Decide which SID to use based on the ACL type. */
2512 switch(tagtype) {
2513 case SMB_ACL_USER_OBJ:
2514 /* Get the SID from the owner. */
2515 sid_copy(&sid, powner);
2516 unix_ug.uid = psbuf->st_ex_uid;
2517 owner_type = UID_ACE;
2518 break;
2519 case SMB_ACL_USER:
2520 {
2521 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2522 if (puid == NULL) {
2523 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2524 continue;
2525 }
2526 uid_to_sid( &sid, *puid);
2527 unix_ug.uid = *puid;
2528 owner_type = UID_ACE;
2529 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2530 break;
2531 }
2532 case SMB_ACL_GROUP_OBJ:
2533 /* Get the SID from the owning group. */
2534 sid_copy(&sid, pgroup);
2535 unix_ug.gid = psbuf->st_ex_gid;
2536 owner_type = GID_ACE;
2537 break;
2538 case SMB_ACL_GROUP:
2539 {
2540 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2541 if (pgid == NULL) {
2542 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2543 continue;
2544 }
2545 gid_to_sid( &sid, *pgid);
2546 unix_ug.gid = *pgid;
2547 owner_type = GID_ACE;
2548 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2549 break;
2550 }
2551 case SMB_ACL_MASK:
2552 acl_mask = convert_permset_to_mode_t(conn, permset);
2553 continue; /* Don't count the mask as an entry. */
2554 case SMB_ACL_OTHER:
2555 /* Use the Everyone SID */
2556 sid = global_sid_World;
2557 unix_ug.world = -1;
2558 owner_type = WORLD_ACE;
2559 break;
2560 default:
2561 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2562 continue;
2563 }
2564
2565 /*
2566 * Add this entry to the list.
2567 */
2568
2569 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2570 goto fail;
2571
2572 ZERO_STRUCTP(ace);
2573 ace->type = tagtype;
2574 ace->perms = convert_permset_to_mode_t(conn, permset);
2575 ace->attr = ALLOW_ACE;
2576 ace->trustee = sid;
2577 ace->unix_ug = unix_ug;
2578 ace->owner_type = owner_type;
2579 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2580
2581 DLIST_ADD(l_head, ace);
2582 }
2583
2584 /*
2585 * This next call will ensure we have at least a user/group/world set.
2586 */
2587
2588 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2589 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2590 psbuf, False))
2591 goto fail;
2592
2593 /*
2594 * Now go through the list, masking the permissions with the
2595 * acl_mask. Ensure all DENY Entries are at the start of the list.
2596 */
2597
2598 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2599
2600 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2601 next_ace = ace->next;
2602
2603 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2604 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2605 ace->perms &= acl_mask;
2606
2607 if (ace->perms == 0) {
2608 DLIST_PROMOTE(l_head, ace);
2609 }
2610
2611 if( DEBUGLVL( 10 ) ) {
2612 print_canon_ace(ace, ace_count);
2613 }
2614 }
2615
2616 arrange_posix_perms(fname,&l_head );
2617
2618 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2619
2620 return l_head;
2621
2622 fail:
2623
2624 free_canon_ace_list(l_head);
2625 return NULL;
2626 }
2627
2628 /****************************************************************************
2629 Check if the current user group list contains a given group.
2630 ****************************************************************************/
2631
2632 bool current_user_in_group(connection_struct *conn, gid_t gid)
2633 {
2634 int i;
2635 const struct security_unix_token *utok = get_current_utok(conn);
2636
2637 for (i = 0; i < utok->ngroups; i++) {
2638 if (utok->groups[i] == gid) {
2639 return True;
2640 }
2641 }
2642
2643 return False;
2644 }
2645
2646 /****************************************************************************
2647 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2648 ****************************************************************************/
2649
2650 static bool acl_group_override(connection_struct *conn,
2651 const struct smb_filename *smb_fname)
2652 {
2653 if ((errno != EPERM) && (errno != EACCES)) {
2654 return false;
2655 }
2656
2657 /* file primary group == user primary or supplementary group */
2658 if (lp_acl_group_control(SNUM(conn)) &&
2659 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2660 return true;
2661 }
2662
2663 /* user has writeable permission */
2664 if (lp_dos_filemode(SNUM(conn)) &&
2665 can_write_to_file(conn, smb_fname)) {
2666 return true;
2667 }
2668
2669 return false;
2670 }
2671
2672 /****************************************************************************
2673 Attempt to apply an ACL to a file or directory.
2674 ****************************************************************************/
2675
2676 static bool set_canon_ace_list(files_struct *fsp,
2677 canon_ace *the_ace,
2678 bool default_ace,
2679 const SMB_STRUCT_STAT *psbuf,
2680 bool *pacl_set_support)
2681 {
2682 connection_struct *conn = fsp->conn;
2683 bool ret = False;
2684 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2685 canon_ace *p_ace;
2686 int i;
2687 SMB_ACL_ENTRY_T mask_entry;
2688 bool got_mask_entry = False;
2689 SMB_ACL_PERMSET_T mask_permset;
2690 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2691 bool needs_mask = False;
2692 mode_t mask_perms = 0;
2693
2694 /* Use the psbuf that was passed in. */
2695 if (psbuf != &fsp->fsp_name->st) {
2696 fsp->fsp_name->st = *psbuf;
2697 }
2698
2699 #if defined(POSIX_ACL_NEEDS_MASK)
2700 /* HP-UX always wants to have a mask (called "class" there). */
2701 needs_mask = True;
2702 #endif
2703
2704 if (the_acl == NULL) {
2705
2706 if (!no_acl_syscall_error(errno)) {
2707 /*
2708 * Only print this error message if we have some kind of ACL
2709 * support that's not working. Otherwise we would always get this.
2710 */
2711 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2712 default_ace ? "default" : "file", strerror(errno) ));
2713 }
2714 *pacl_set_support = False;
2715 goto fail;
2716 }
2717
2718 if( DEBUGLVL( 10 )) {
2719 dbgtext("set_canon_ace_list: setting ACL:\n");
2720 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2721 print_canon_ace( p_ace, i);
2722 }
2723 }
2724
2725 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2726 SMB_ACL_ENTRY_T the_entry;
2727 SMB_ACL_PERMSET_T the_permset;
2728
2729 /*
2730 * ACLs only "need" an ACL_MASK entry if there are any named user or
2731 * named group entries. But if there is an ACL_MASK entry, it applies
2732 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2733 * so that it doesn't deny (i.e., mask off) any permissions.
2734 */
2735
2736 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2737 needs_mask = True;
2738 mask_perms |= p_ace->perms;
2739 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2740 mask_perms |= p_ace->perms;
2741 }
2742
2743 /*
2744 * Get the entry for this ACE.
2745 */
2746
2747 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2748 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2749 i, strerror(errno) ));
2750 goto fail;
2751 }
2752
2753 if (p_ace->type == SMB_ACL_MASK) {
2754 mask_entry = the_entry;
2755 got_mask_entry = True;
2756 }
2757
2758 /*
2759 * Ok - we now know the ACL calls should be working, don't
2760 * allow fallback to chmod.
2761 */
2762
2763 *pacl_set_support = True;
2764
2765 /*
2766 * Initialise the entry from the canon_ace.
2767 */
2768
2769 /*
2770 * First tell the entry what type of ACE this is.
2771 */
2772
2773 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2774 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2775 i, strerror(errno) ));
2776 goto fail;
2777 }
2778
2779 /*
2780 * Only set the qualifier (user or group id) if the entry is a user
2781 * or group id ACE.
2782 */
2783
2784 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2785 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2786 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2787 i, strerror(errno) ));
2788 goto fail;
2789 }
2790 }
2791
2792 /*
2793 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2794 */
2795
2796 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2797 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2798 i, strerror(errno) ));
2799 goto fail;
2800 }
2801
2802 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2803 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2804 (unsigned int)p_ace->perms, i, strerror(errno) ));
2805 goto fail;
2806 }
2807
2808 /*
2809 * ..and apply them to the entry.
2810 */
2811
2812 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2813 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2814 i, strerror(errno) ));
2815 goto fail;
2816 }
2817
2818 if( DEBUGLVL( 10 ))
2819 print_canon_ace( p_ace, i);
2820
2821 }
2822
2823 if (needs_mask && !got_mask_entry) {
2824 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2825 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2826 goto fail;
2827 }
2828
2829 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2830 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2831 goto fail;
2832 }
2833
2834 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2835 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2836 goto fail;
2837 }
2838
2839 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2840 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2841 goto fail;
2842 }
2843
2844 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2845 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2846 goto fail;
2847 }
2848 }
2849
2850 /*
2851 * Finally apply it to the file or directory.
2852 */
2853
2854 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2855 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2856 the_acl_type, the_acl) == -1) {
2857 /*
2858 * Some systems allow all the above calls and only fail with no ACL support
2859 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2860 */
2861 if (no_acl_syscall_error(errno)) {
2862 *pacl_set_support = False;
2863 }
2864
2865 if (acl_group_override(conn, fsp->fsp_name)) {
2866 int sret;
2867
2868 DEBUG(5,("set_canon_ace_list: acl group "
2869 "control on and current user in file "
2870 "%s primary group.\n",
2871 fsp_str_dbg(fsp)));
2872
2873 become_root();
2874 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2875 fsp->fsp_name->base_name, the_acl_type,
2876 the_acl);
2877 unbecome_root();
2878 if (sret == 0) {
2879 ret = True;
2880 }
2881 }
2882
2883 if (ret == False) {
2884 DEBUG(2,("set_canon_ace_list: "
2885 "sys_acl_set_file type %s failed for "
2886 "file %s (%s).\n",
2887 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2888 "directory default" : "file",
2889 fsp_str_dbg(fsp), strerror(errno)));
2890 goto fail;
2891 }
2892 }
2893 } else {
2894 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2895 /*
2896 * Some systems allow all the above calls and only fail with no ACL support
2897 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2898 */
2899 if (no_acl_syscall_error(errno)) {
2900 *pacl_set_support = False;
2901 }
2902
2903 if (acl_group_override(conn, fsp->fsp_name)) {
2904 int sret;
2905
2906 DEBUG(5,("set_canon_ace_list: acl group "
2907 "control on and current user in file "
2908 "%s primary group.\n",
2909 fsp_str_dbg(fsp)));
2910
2911 become_root();
2912 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2913 unbecome_root();
2914 if (sret == 0) {
2915 ret = True;
2916 }
2917 }
2918
2919 if (ret == False) {
2920 DEBUG(2,("set_canon_ace_list: "
2921 "sys_acl_set_file failed for file %s "
2922 "(%s).\n",
2923 fsp_str_dbg(fsp), strerror(errno)));
2924 goto fail;
2925 }
2926 }
2927 }
2928
2929 ret = True;
2930
2931 fail:
2932
2933 if (the_acl != NULL) {
2934 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2935 }
2936
2937 return ret;
2938 }
2939
2940 /****************************************************************************
2941 Find a particular canon_ace entry.
2942 ****************************************************************************/
2943
2944 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2945 {
2946 while (list) {
2947 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2948 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2949 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2950 break;
2951 list = list->next;
2952 }
2953 return list;
2954 }
2955
2956 /****************************************************************************
2957
2958 ****************************************************************************/
2959
2960 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2961 {
2962 SMB_ACL_ENTRY_T entry;
2963
2964 if (!the_acl)
2965 return NULL;
2966 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2967 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2968 return NULL;
2969 }
2970 return the_acl;
2971 }
2972
2973 /****************************************************************************
2974 Convert a canon_ace to a generic 3 element permission - if possible.
2975 ****************************************************************************/
2976
2977 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2978
2979 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2980 {
2981 int snum = SNUM(fsp->conn);
2982 size_t ace_count = count_canon_ace_list(file_ace_list);
2983 canon_ace *ace_p;
2984 canon_ace *owner_ace = NULL;
2985 canon_ace *group_ace = NULL;
2986 canon_ace *other_ace = NULL;
2987 mode_t and_bits;
2988 mode_t or_bits;
2989
2990 if (ace_count != 3) {
2991 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2992 "entries for file %s to convert to posix perms.\n",
2993 fsp_str_dbg(fsp)));
2994 return False;
2995 }
2996
2997 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2998 if (ace_p->owner_type == UID_ACE)
2999 owner_ace = ace_p;
3000 else if (ace_p->owner_type == GID_ACE)
3001 group_ace = ace_p;
3002 else if (ace_p->owner_type == WORLD_ACE)
3003 other_ace = ace_p;
3004 }
3005
3006 if (!owner_ace || !group_ace || !other_ace) {
3007 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3008 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3009 return False;
3010 }
3011
3012 *posix_perms = (mode_t)0;
3013
3014 *posix_perms |= owner_ace->perms;
3015 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3016 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3017 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3018 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3019 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3020 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3021
3022 /* The owner must have at least read access. */
3023
3024 *posix_perms |= S_IRUSR;
3025 if (fsp->is_directory)
3026 *posix_perms |= (S_IWUSR|S_IXUSR);
3027
3028 /* If requested apply the masks. */
3029
3030 /* Get the initial bits to apply. */
3031
3032 if (fsp->is_directory) {
3033 and_bits = lp_dir_security_mask(snum);
3034 or_bits = lp_force_dir_security_mode(snum);
3035 } else {
3036 and_bits = lp_security_mask(snum);
3037 or_bits = lp_force_security_mode(snum);
3038 }
3039
3040 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3041
3042 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3043 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3044 (int)group_ace->perms, (int)other_ace->perms,
3045 (int)*posix_perms, fsp_str_dbg(fsp)));
3046
3047 return True;
3048 }
3049
3050 /****************************************************************************
3051 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3052 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3053 with CI|OI set so it is inherited and also applies to the directory.
3054 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3055 ****************************************************************************/
3056
3057 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3058 {
3059 size_t i, j;
3060
3061 for (i = 0; i < num_aces; i++) {
3062 for (j = i+1; j < num_aces; j++) {
3063 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3064 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3065 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3066 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3067
3068 /* We know the lower number ACE's are file entries. */
3069 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3070 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3071 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3072 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3073 (i_inh == j_inh) &&
3074 (i_flags_ni == 0) &&
3075 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3076 SEC_ACE_FLAG_CONTAINER_INHERIT|
3077 SEC_ACE_FLAG_INHERIT_ONLY))) {
3078 /*
3079 * W2K wants to have access allowed zero access ACE's
3080 * at the end of the list. If the mask is zero, merge
3081 * the non-inherited ACE onto the inherited ACE.
3082 */
3083
3084 if (nt_ace_list[i].access_mask == 0) {
3085 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3086 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3087 if (num_aces - i - 1 > 0)
3088 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3089 sizeof(struct security_ace));
3090
3091 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3092 (unsigned int)i, (unsigned int)j ));
3093 } else {
3094 /*
3095 * These are identical except for the flags.
3096 * Merge the inherited ACE onto the non-inherited ACE.
3097 */
3098
3099 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3100 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3101 if (num_aces - j - 1 > 0)
3102 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3103 sizeof(struct security_ace));
3104
3105 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3106 (unsigned int)j, (unsigned int)i ));
3107 }
3108 num_aces--;
3109 break;
3110 }
3111 }
3112 }
3113
3114 return num_aces;
3115 }
3116
3117 /*
3118 * Add or Replace ACE entry.
3119 * In some cases we need to add a specific ACE for compatibility reasons.
3120 * When doing that we must make sure we are not actually creating a duplicate
3121 * entry. So we need to search whether an ACE entry already exist and eventually
3122 * replacce the access mask, or add a completely new entry if none was found.
3123 *
3124 * This function assumes the array has enough space to add a new entry without
3125 * any reallocation of memory.
3126 */
3127
3128 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3129 const struct dom_sid *sid, enum security_ace_type type,
3130 uint32_t mask, uint8_t flags)
3131 {
3132 int i;
3133
3134 /* first search for a duplicate */
3135 for (i = 0; i < *num_aces; i++) {
3136 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3137 (nt_ace_list[i].flags == flags)) break;
3138 }
3139
3140 if (i < *num_aces) { /* found */
3141 nt_ace_list[i].type = type;
3142 nt_ace_list[i].access_mask = mask;
3143 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3144 i, sid_string_dbg(sid), flags));
3145 return;
3146 }
3147
3148 /* not found, append it */
3149 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3150 }
3151
3152
3153 /****************************************************************************
3154 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3155 the space for the return elements and returns the size needed to return the
3156 security descriptor. This should be the only external function needed for
3157 the UNIX style get ACL.
3158 ****************************************************************************/
3159
3160 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3161 const char *name,
3162 const SMB_STRUCT_STAT *sbuf,
3163 struct pai_val *pal,
3164 SMB_ACL_T posix_acl,
3165 SMB_ACL_T def_acl,
3166 uint32_t security_info,
3167 struct security_descriptor **ppdesc)
3168 {
3169 struct dom_sid owner_sid;
3170 struct dom_sid group_sid;
3171 size_t sd_size = 0;
3172 struct security_acl *psa = NULL;
3173 size_t num_acls = 0;
3174 size_t num_def_acls = 0;
3175 size_t num_aces = 0;
3176 canon_ace *file_ace = NULL;
3177 canon_ace *dir_ace = NULL;
3178 struct security_ace *nt_ace_list = NULL;
3179 size_t num_profile_acls = 0;
3180 struct dom_sid orig_owner_sid;
3181 struct security_descriptor *psd = NULL;
3182 int i;
3183
3184 /*
3185 * Get the owner, group and world SIDs.
3186 */
3187
3188 create_file_sids(sbuf, &owner_sid, &group_sid);
3189
3190 if (lp_profile_acls(SNUM(conn))) {
3191 /* For WXP SP1 the owner must be administrators. */
3192 sid_copy(&orig_owner_sid, &owner_sid);
3193 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3194 sid_copy(&group_sid, &global_sid_Builtin_Users);
3195 num_profile_acls = 3;
3196 }
3197
3198 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3199
3200 /*
3201 * In the optimum case Creator Owner and Creator Group would be used for
3202 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3203 * would lead to usability problems under Windows: The Creator entries
3204 * are only available in browse lists of directories and not for files;
3205 * additionally the identity of the owning group couldn't be determined.
3206 * We therefore use those identities only for Default ACLs.
3207 */
3208
3209 /* Create the canon_ace lists. */
3210 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3211 &owner_sid, &group_sid, pal,
3212 SMB_ACL_TYPE_ACCESS);
3213
3214 /* We must have *some* ACLS. */
3215
3216 if (count_canon_ace_list(file_ace) == 0) {
3217 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3218 goto done;
3219 }
3220
3221 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3222 dir_ace = canonicalise_acl(conn, name, def_acl,
3223 sbuf,
3224 &global_sid_Creator_Owner,
3225 &global_sid_Creator_Group,
3226 pal, SMB_ACL_TYPE_DEFAULT);
3227 }
3228
3229 /*
3230 * Create the NT ACE list from the canonical ace lists.
3231 */
3232
3233 {
3234 canon_ace *ace;
3235 enum security_ace_type nt_acl_type;
3236
3237 if (nt4_compatible_acls() && dir_ace) {
3238 /*
3239 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3240 * but no non-INHERIT_ONLY entry for one SID. So we only
3241 * remove entries from the Access ACL if the
3242 * corresponding Default ACL entries have also been
3243 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3244 * are exceptions. We can do nothing
3245 * intelligent if the Default ACL contains entries that
3246 * are not also contained in the Access ACL, so this
3247 * case will still fail under NT 4.
3248 */
3249
3250 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3251 if (ace && !ace->perms) {
3252 DLIST_REMOVE(dir_ace, ace);
3253 TALLOC_FREE(ace);
3254
3255 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3256 if (ace && !ace->perms) {
3257 DLIST_REMOVE(file_ace, ace);
3258 TALLOC_FREE(ace);
3259 }
3260 }
3261
3262 /*
3263 * WinNT doesn't usually have Creator Group
3264 * in browse lists, so we send this entry to
3265 * WinNT even if it contains no relevant
3266 * permissions. Once we can add
3267 * Creator Group to browse lists we can
3268 * re-enable this.
3269 */
3270
3271 #if 0
3272 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3273 if (ace && !ace->perms) {
3274 DLIST_REMOVE(dir_ace, ace);
3275 TALLOC_FREE(ace);
3276 }
3277 #endif
3278
3279 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3280 if (ace && !ace->perms) {
3281 DLIST_REMOVE(file_ace, ace);
3282 TALLOC_FREE(ace);
3283 }
3284 }
3285
3286 num_acls = count_canon_ace_list(file_ace);
3287 num_def_acls = count_canon_ace_list(dir_ace);
3288
3289 /* Allocate the ace list. */
3290 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3291 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3292 goto done;
3293 }
3294
3295 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3296
3297 /*
3298 * Create the NT ACE list from the canonical ace lists.
3299 */
3300
3301 for (ace = file_ace; ace != NULL; ace = ace->next) {
3302 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3303 &nt_acl_type,
3304 ace->perms,
3305 S_ISDIR(sbuf->st_ex_mode));
3306 init_sec_ace(&nt_ace_list[num_aces++],
3307 &ace->trustee,
3308 nt_acl_type,
3309 acc,
3310 ace->ace_flags);
3311 }
3312
3313 /* The User must have access to a profile share - even
3314 * if we can't map the SID. */
3315 if (lp_profile_acls(SNUM(conn))) {
3316 add_or_replace_ace(nt_ace_list, &num_aces,
3317 &global_sid_Builtin_Users,
3318 SEC_ACE_TYPE_ACCESS_ALLOWED,
3319 FILE_GENERIC_ALL, 0);
3320 }
3321
3322 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3323 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3324 &nt_acl_type,
3325 ace->perms,
3326 S_ISDIR(sbuf->st_ex_mode));
3327 init_sec_ace(&nt_ace_list[num_aces++],
3328 &ace->trustee,
3329 nt_acl_type,
3330 acc,
3331 ace->ace_flags |
3332 SEC_ACE_FLAG_OBJECT_INHERIT|
3333 SEC_ACE_FLAG_CONTAINER_INHERIT|
3334 SEC_ACE_FLAG_INHERIT_ONLY);
3335 }
3336
3337 /* The User must have access to a profile share - even
3338 * if we can't map the SID. */
3339 if (lp_profile_acls(SNUM(conn))) {
3340 add_or_replace_ace(nt_ace_list, &num_aces,
3341 &global_sid_Builtin_Users,
3342 SEC_ACE_TYPE_ACCESS_ALLOWED,
3343 FILE_GENERIC_ALL,
3344 SEC_ACE_FLAG_OBJECT_INHERIT |
3345 SEC_ACE_FLAG_CONTAINER_INHERIT |
3346 SEC_ACE_FLAG_INHERIT_ONLY);
3347 }
3348
3349 /*
3350 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3351 * Win2K needs this to get the inheritance correct when replacing ACLs
3352 * on a directory tree. Based on work by Jim @ IBM.
3353 */
3354
3355 num_aces = merge_default_aces(nt_ace_list, num_aces);
3356
3357 if (lp_profile_acls(SNUM(conn))) {
3358 for (i = 0; i < num_aces; i++) {
3359 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3360 add_or_replace_ace(nt_ace_list, &num_aces,
3361 &orig_owner_sid,
3362 nt_ace_list[i].type,
3363 nt_ace_list[i].access_mask,
3364 nt_ace_list[i].flags);
3365 break;
3366 }
3367 }
3368 }
3369 }
3370
3371 if (num_aces) {
3372 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3373 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3374 goto done;
3375 }
3376 }
3377 } /* security_info & SECINFO_DACL */
3378
3379 psd = make_standard_sec_desc( talloc_tos(),
3380 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3381 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3382 psa,
3383 &sd_size);
3384
3385 if(!psd) {
3386 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3387 sd_size = 0;
3388 goto done;
3389 }
3390
3391 /*
3392 * Windows 2000: The DACL_PROTECTED flag in the security
3393 * descriptor marks the ACL as non-inheriting, i.e., no
3394 * ACEs from higher level directories propagate to this
3395 * ACL. In the POSIX ACL model permissions are only
3396 * inherited at file create time, so ACLs never contain
3397 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3398 * flag doesn't seem to bother Windows NT.
3399 * Always set this if map acl inherit is turned off.
3400 */
3401 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3402 psd->type |= SEC_DESC_DACL_PROTECTED;
3403 } else {
3404 psd->type |= pal->sd_type;
3405 }
3406
3407 if (psd->dacl) {
3408 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3409 }
3410
3411 *ppdesc = psd;
3412
3413 done:
3414
3415 if (posix_acl) {
3416 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3417 }
3418 if (def_acl) {
3419 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3420 }
3421 free_canon_ace_list(file_ace);
3422 free_canon_ace_list(dir_ace);
3423 free_inherited_info(pal);
3424 TALLOC_FREE(nt_ace_list);
3425
3426 return NT_STATUS_OK;
3427 }
3428
3429 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3430 struct security_descriptor **ppdesc)
3431 {
3432 SMB_STRUCT_STAT sbuf;
3433 SMB_ACL_T posix_acl = NULL;
3434 struct pai_val *pal;
3435
3436 *ppdesc = NULL;
3437
3438 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3439 fsp_str_dbg(fsp)));
3440
3441 /* can it happen that fsp_name == NULL ? */
3442 if (fsp->is_directory || fsp->fh->fd == -1) {
3443 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3444 security_info, ppdesc);
3445 }
3446
3447 /* Get the stat struct for the owner info. */
3448 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3449 return map_nt_error_from_unix(errno);
3450 }
3451
3452 /* Get the ACL from the fd. */
3453 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3454
3455 pal = fload_inherited_info(fsp);
3456
3457 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3458 &sbuf, pal, posix_acl, NULL,
3459 security_info, ppdesc);
3460 }
3461
3462 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3463 uint32_t security_info, struct security_descriptor **ppdesc)
3464 {
3465 SMB_ACL_T posix_acl = NULL;
3466 SMB_ACL_T def_acl = NULL;
3467 struct pai_val *pal;
3468 struct smb_filename smb_fname;
3469 int ret;
3470
3471 *ppdesc = NULL;
3472
3473 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3474
3475 ZERO_STRUCT(smb_fname);
3476 smb_fname.base_name = discard_const_p(char, name);
3477
3478 /* Get the stat struct for the owner info. */
3479 if (lp_posix_pathnames()) {
3480 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3481 } else {
3482 ret = SMB_VFS_STAT(conn, &smb_fname);
3483 }
3484
3485 if (ret == -1) {
3486 return map_nt_error_from_unix(errno);
3487 }
3488
3489 /* Get the ACL from the path. */
3490 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3491
3492 /* If it's a directory get the default POSIX ACL. */
3493 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3494 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3495 def_acl = free_empty_sys_acl(conn, def_acl);
3496 }
3497
3498 pal = load_inherited_info(conn, name);
3499
3500 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3501 posix_acl, def_acl, security_info,
3502 ppdesc);
3503 }
3504
3505 /****************************************************************************
3506 Try to chown a file. We will be able to chown it under the following conditions.
3507
3508 1) If we have root privileges, then it will just work.
3509 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3510 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3511 4) If we have write permission to the file and dos_filemodes is set
3512 then allow chown to the currently authenticated user.
3513 ****************************************************************************/
3514
3515 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3516 {
3517 NTSTATUS status;
3518
3519 if(!CAN_WRITE(fsp->conn)) {
3520 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3521 }
3522
3523 /* Case (1). */
3524 status = vfs_chown_fsp(fsp, uid, gid);
3525 if (NT_STATUS_IS_OK(status)) {
3526 return status;
3527 }
3528
3529 /* Case (2) / (3) */
3530 if (lp_enable_privileges()) {
3531 bool has_take_ownership_priv = security_token_has_privilege(
3532 get_current_nttok(fsp->conn),
3533 SEC_PRIV_TAKE_OWNERSHIP);
3534 bool has_restore_priv = security_token_has_privilege(
3535 get_current_nttok(fsp->conn),
3536 SEC_PRIV_RESTORE);
3537
3538 if (has_restore_priv) {
3539 ; /* Case (2) */
3540 } else if (has_take_ownership_priv) {
3541 /* Case (3) */
3542 if (uid == get_current_uid(fsp->conn)) {
3543 gid = (gid_t)-1;
3544 } else {
3545 has_take_ownership_priv = false;
3546 }
3547 }
3548
3549 if (has_take_ownership_priv || has_restore_priv) {
3550 become_root();
3551 status = vfs_chown_fsp(fsp, uid, gid);
3552 unbecome_root();
3553 return status;
3554 }
3555 }
3556
3557 /* Case (4). */
3558 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3559 return NT_STATUS_ACCESS_DENIED;
3560 }
3561
3562 /* only allow chown to the current user. This is more secure,
3563 and also copes with the case where the SID in a take ownership ACL is
3564 a local SID on the users workstation
3565 */
3566 if (uid != get_current_uid(fsp->conn)) {
3567 return NT_STATUS_ACCESS_DENIED;
3568 }
3569
3570 become_root();
3571 /* Keep the current file gid the same. */
3572 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3573 unbecome_root();
3574
3575 return status;
3576 }
3577
3578 #if 0
3579 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3580
3581 /****************************************************************************
3582 Take care of parent ACL inheritance.
3583 ****************************************************************************/
3584
3585 NTSTATUS append_parent_acl(files_struct *fsp,
3586 const struct security_descriptor *pcsd,
3587 struct security_descriptor **pp_new_sd)
3588 {
3589 struct smb_filename *smb_dname = NULL;
3590 struct security_descriptor *parent_sd = NULL;
3591 files_struct *parent_fsp = NULL;
3592 TALLOC_CTX *mem_ctx = talloc_tos();
3593 char *parent_name = NULL;
3594 struct security_ace *new_ace = NULL;
3595 unsigned int num_aces = pcsd->dacl->num_aces;
3596 NTSTATUS status;
3597 int info;
3598 unsigned int i, j;
3599 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3600 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3601
3602 if (psd == NULL) {
3603 return NT_STATUS_NO_MEMORY;
3604 }
3605
3606 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3607 NULL)) {
3608 return NT_STATUS_NO_MEMORY;
3609 }
3610
3611 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3612 &smb_dname);
3613 if (!NT_STATUS_IS_OK(status)) {
3614 goto fail;
3615 }
3616
3617 status = SMB_VFS_CREATE_FILE(
3618 fsp->conn, /* conn */
3619 NULL, /* req */
3620 0, /* root_dir_fid */
3621 smb_dname, /* fname */
3622 FILE_READ_ATTRIBUTES, /* access_mask */
3623 FILE_SHARE_NONE, /* share_access */
3624 FILE_OPEN, /* create_disposition*/
3625 FILE_DIRECTORY_FILE, /* create_options */
3626 0, /* file_attributes */
3627 INTERNAL_OPEN_ONLY, /* oplock_request */
3628 0, /* allocation_size */
3629 NULL, /* sd */
3630 NULL, /* ea_list */
3631 &parent_fsp, /* result */
3632 &info); /* pinfo */
3633
3634 if (!NT_STATUS_IS_OK(status)) {
3635 TALLOC_FREE(smb_dname);
3636 return status;
3637 }
3638
3639 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3640 SECINFO_DACL, &parent_sd );
3641
3642 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3643 TALLOC_FREE(smb_dname);
3644
3645 if (!NT_STATUS_IS_OK(status)) {
3646 return status;
3647 }
3648
3649 /*
3650 * Make room for potentially all the ACLs from
3651 * the parent. We used to add the ugw triple here,
3652 * as we knew we were dealing with POSIX ACLs.
3653 * We no longer need to do so as we can guarentee
3654 * that a default ACL from the parent directory will
3655 * be well formed for POSIX ACLs if it came from a
3656 * POSIX ACL source, and if we're not writing to a
3657 * POSIX ACL sink then we don't care if it's not well
3658 * formed. JRA.
3659 */
3660
3661 num_aces += parent_sd->dacl->num_aces;
3662
3663 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3664 num_aces)) == NULL) {
3665 return NT_STATUS_NO_MEMORY;
3666 }
3667
3668 /* Start by copying in all the given ACE entries. */
3669 for (i = 0; i < psd->dacl->num_aces; i++) {
3670 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3671 }
3672
3673 /*
3674 * Note that we're ignoring "inherit permissions" here
3675 * as that really only applies to newly created files. JRA.
3676 */
3677
3678 /* Finally append any inherited ACEs. */
3679 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3680 struct security_ace *se = &parent_sd->dacl->aces[j];
3681
3682 if (fsp->is_directory) {
3683 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3684 /* Doesn't apply to a directory - ignore. */
3685 DEBUG(10,("append_parent_acl: directory %s "
3686 "ignoring non container "
3687 "inherit flags %u on ACE with sid %s "
3688 "from parent %s\n",
3689 fsp_str_dbg(fsp),
3690 (unsigned int)se->flags,
3691 sid_string_dbg(&se->trustee),
3692 parent_name));
3693 continue;
3694 }
3695 } else {
3696 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3697 /* Doesn't apply to a file - ignore. */
3698 DEBUG(10,("append_parent_acl: file %s "
3699 "ignoring non object "
3700 "inherit flags %u on ACE with sid %s "
3701 "from parent %s\n",
3702 fsp_str_dbg(fsp),
3703 (unsigned int)se->flags,
3704 sid_string_dbg(&se->trustee),
3705 parent_name));
3706 continue;
3707 }
3708 }
3709
3710 if (is_dacl_protected) {
3711 /* If the DACL is protected it means we must
3712 * not overwrite an existing ACE entry with the
3713 * same SID. This is order N^2. Ouch :-(. JRA. */
3714 unsigned int k;
3715 for (k = 0; k < psd->dacl->num_aces; k++) {
3716 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3717 &se->trustee)) {
3718 break;
3719 }
3720 }
3721 if (k < psd->dacl->num_aces) {
3722 /* SID matched. Ignore. */
3723 DEBUG(10,("append_parent_acl: path %s "
3724 "ignoring ACE with protected sid %s "
3725 "from parent %s\n",
3726 fsp_str_dbg(fsp),
3727 sid_string_dbg(&se->trustee),
3728 parent_name));
3729 continue;
3730 }
3731 }
3732
3733 sec_ace_copy(&new_ace[i], se);
3734 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3735 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3736 }
3737 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3738
3739 if (fsp->is_directory) {
3740 /*
3741 * Strip off any inherit only. It's applied.
3742 */
3743 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3744 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3745 /* No further inheritance. */
3746 new_ace[i].flags &=
3747 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3748 SEC_ACE_FLAG_OBJECT_INHERIT);
3749 }
3750 } else {
3751 /*
3752 * Strip off any container or inherit
3753 * flags, they can't apply to objects.
3754 */
3755 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3756 SEC_ACE_FLAG_INHERIT_ONLY|
3757 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3758 }
3759 i++;
3760
3761 DEBUG(10,("append_parent_acl: path %s "
3762 "inheriting ACE with sid %s "
3763 "from parent %s\n",
3764 fsp_str_dbg(fsp),
3765 sid_string_dbg(&se->trustee),
3766 parent_name));
3767 }
3768
3769 psd->dacl->aces = new_ace;
3770 psd->dacl->num_aces = i;
3771 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3772 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3773
3774 *pp_new_sd = psd;
3775 return status;
3776 }
3777 #endif
3778
3779 /****************************************************************************
3780 Reply to set a security descriptor on an fsp. security_info_sent is the
3781 description of the following NT ACL.
3782 This should be the only external function needed for the UNIX style set ACL.
3783 We make a copy of psd_orig as internal functions modify the elements inside
3784 it, even though it's a const pointer.
3785 ****************************************************************************/
3786
3787 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3788 {
3789 connection_struct *conn = fsp->conn;
3790 uid_t user = (uid_t)-1;
3791 gid_t grp = (gid_t)-1;
3792 struct dom_sid file_owner_sid;
3793 struct dom_sid file_grp_sid;
3794 canon_ace *file_ace_list = NULL;
3795 canon_ace *dir_ace_list = NULL;
3796 bool acl_perms = False;
3797 mode_t orig_mode = (mode_t)0;
3798 NTSTATUS status;
3799 bool set_acl_as_root = false;
3800 bool acl_set_support = false;
3801 bool ret = false;
3802 struct security_descriptor *psd = NULL;
3803
3804 DEBUG(10,("set_nt_acl: called for file %s\n",
3805 fsp_str_dbg(fsp)));
3806
3807 if (!CAN_WRITE(conn)) {
3808 DEBUG(10,("set acl rejected on read-only share\n"));
3809 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3810 }
3811
3812 if (!psd_orig) {
3813 return NT_STATUS_INVALID_PARAMETER;
3814 }
3815
3816 psd = dup_sec_desc(talloc_tos(), psd_orig);
3817 if (!psd) {
3818 return NT_STATUS_NO_MEMORY;
3819 }
3820
3821 /*
3822 * Get the current state of the file.
3823 */
3824
3825 status = vfs_stat_fsp(fsp);
3826 if (!NT_STATUS_IS_OK(status)) {
3827 return status;
3828 }
3829
3830 /* Save the original element we check against. */
3831 orig_mode = fsp->fsp_name->st.st_ex_mode;
3832
3833 /*
3834 * Unpack the user/group/world id's.
3835 */
3836
3837 /* POSIX can't cope with missing owner/group. */
3838 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3839 security_info_sent &= ~SECINFO_OWNER;
3840 }
3841 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3842 security_info_sent &= ~SECINFO_GROUP;
3843 }
3844
3845 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3846 if (!NT_STATUS_IS_OK(status)) {
3847 return status;
3848 }
3849
3850 /*
3851 * Do we need to chown ? If so this must be done first as the incoming
3852 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3853 * Noticed by Simo.
3854 */
3855
3856 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3857 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3858
3859 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3860 fsp_str_dbg(fsp), (unsigned int)user,
3861 (unsigned int)grp));
3862
3863 status = try_chown(fsp, user, grp);
3864 if(!NT_STATUS_IS_OK(status)) {
3865 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3866 "= %s.\n", fsp_str_dbg(fsp),
3867 (unsigned int)user,
3868 (unsigned int)grp,
3869 nt_errstr(status)));
3870 return status;
3871 }
3872
3873 /*
3874 * Recheck the current state of the file, which may have changed.
3875 * (suid/sgid bits, for instance)
3876 */
3877
3878 status = vfs_stat_fsp(fsp);
3879 if (!NT_STATUS_IS_OK(status)) {
3880 return status;
3881 }
3882
3883 /* Save the original element we check against. */
3884 orig_mode = fsp->fsp_name->st.st_ex_mode;
3885
3886 /* If we successfully chowned, we know we must
3887 * be able to set the acl, so do it as root.
3888 */
3889 set_acl_as_root = true;
3890 }
3891
3892 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3893
3894 if((security_info_sent & SECINFO_DACL) &&
3895 (psd->type & SEC_DESC_DACL_PRESENT) &&
3896 (psd->dacl == NULL)) {
3897 struct security_ace ace[3];
3898
3899 /* We can't have NULL DACL in POSIX.
3900 Use owner/group/Everyone -> full access. */
3901
3902 init_sec_ace(&ace[0],
3903 &file_owner_sid,
3904 SEC_ACE_TYPE_ACCESS_ALLOWED,
3905 GENERIC_ALL_ACCESS,
3906 0);
3907 init_sec_ace(&ace[1],
3908 &file_grp_sid,
3909 SEC_ACE_TYPE_ACCESS_ALLOWED,
3910 GENERIC_ALL_ACCESS,
3911 0);
3912 init_sec_ace(&ace[2],
3913 &global_sid_World,
3914 SEC_ACE_TYPE_ACCESS_ALLOWED,
3915 GENERIC_ALL_ACCESS,
3916 0);
3917 psd->dacl = make_sec_acl(talloc_tos(),
3918 NT4_ACL_REVISION,
3919 3,
3920 ace);
3921 if (psd->dacl == NULL) {
3922 return NT_STATUS_NO_MEMORY;
3923 }
3924 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3925 }
3926
3927 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3928 &file_grp_sid, &file_ace_list,
3929 &dir_ace_list, security_info_sent, psd);
3930
3931 /* Ignore W2K traverse DACL set. */
3932 if (!file_ace_list && !dir_ace_list) {
3933 return NT_STATUS_OK;
3934 }
3935
3936 if (!acl_perms) {
3937 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3938 free_canon_ace_list(file_ace_list);
3939 free_canon_ace_list(dir_ace_list);
3940 return NT_STATUS_ACCESS_DENIED;
3941 }
3942
3943 /*
3944 * Only change security if we got a DACL.
3945 */
3946
3947 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3948 free_canon_ace_list(file_ace_list);
3949 free_canon_ace_list(dir_ace_list);
3950 return NT_STATUS_OK;
3951 }
3952
3953 /*
3954 * Try using the POSIX ACL set first. Fall back to chmod if
3955 * we have no ACL support on this filesystem.
3956 */
3957
3958 if (acl_perms && file_ace_list) {
3959 if (set_acl_as_root) {
3960 become_root();
3961 }
3962 ret = set_canon_ace_list(fsp, file_ace_list, false,
3963 &fsp->fsp_name->st, &acl_set_support);
3964 if (set_acl_as_root) {
3965 unbecome_root();
3966 }
3967 if (acl_set_support && ret == false) {
3968 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3969 "%s (%s).\n", fsp_str_dbg(fsp),
3970 strerror(errno)));
3971 free_canon_ace_list(file_ace_list);
3972 free_canon_ace_list(dir_ace_list);
3973 return map_nt_error_from_unix(errno);
3974 }
3975 }
3976
3977 if (acl_perms && acl_set_support && fsp->is_directory) {
3978 if (dir_ace_list) {
3979 if (set_acl_as_root) {
3980 become_root();
3981 }
3982 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3983 &fsp->fsp_name->st,
3984 &acl_set_support);
3985 if (set_acl_as_root) {
3986 unbecome_root();
3987 }
3988 if (ret == false) {
3989 DEBUG(3,("set_nt_acl: failed to set default "
3990 "acl on directory %s (%s).\n",
3991 fsp_str_dbg(fsp), strerror(errno)));
3992 free_canon_ace_list(file_ace_list);
3993 free_canon_ace_list(dir_ace_list);
3994 return map_nt_error_from_unix(errno);
3995 }
3996 } else {
3997 int sret = -1;
3998
3999 /*
4000 * No default ACL - delete one if it exists.
4001 */
4002
4003 if (set_acl_as_root) {
4004 become_root();
4005 }
4006 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4007 fsp->fsp_name->base_name);
4008 if (set_acl_as_root) {
4009 unbecome_root();
4010 }
4011 if (sret == -1) {
4012 if (acl_group_override(conn, fsp->fsp_name)) {
4013 DEBUG(5,("set_nt_acl: acl group "
4014 "control on and current user "
4015 "in file %s primary group. "
4016 "Override delete_def_acl\n",
4017 fsp_str_dbg(fsp)));
4018
4019 become_root();
4020 sret =
4021 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4022 conn,
4023 fsp->fsp_name->base_name);
4024 unbecome_root();
4025 }
4026
4027 if (sret == -1) {
4028 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4029 free_canon_ace_list(file_ace_list);
4030 free_canon_ace_list(dir_ace_list);
4031 return map_nt_error_from_unix(errno);
4032 }
4033 }
4034 }
4035 }
4036
4037 if (acl_set_support) {
4038 if (set_acl_as_root) {
4039 become_root();
4040 }
4041 store_inheritance_attributes(fsp,
4042 file_ace_list,
4043 dir_ace_list,
4044 psd->type);
4045 if (set_acl_as_root) {
4046 unbecome_root();
4047 }
4048 }
4049
4050 /*
4051 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4052 */
4053
4054 if(!acl_set_support && acl_perms) {
4055 mode_t posix_perms;
4056
4057 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4058 free_canon_ace_list(file_ace_list);
4059 free_canon_ace_list(dir_ace_list);
4060 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4061 "posix permissions for file %s.\n",
4062 fsp_str_dbg(fsp)));
4063 return NT_STATUS_ACCESS_DENIED;
4064 }
4065
4066 if (orig_mode != posix_perms) {
4067 int sret = -1;
4068
4069 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4070 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4071
4072 if (set_acl_as_root) {
4073 become_root();
4074 }
4075 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4076 posix_perms);
4077 if (set_acl_as_root) {
4078 unbecome_root();
4079 }
4080 if(sret == -1) {
4081 if (acl_group_override(conn, fsp->fsp_name)) {
4082 DEBUG(5,("set_nt_acl: acl group "
4083 "control on and current user "
4084 "in file %s primary group. "
4085 "Override chmod\n",
4086 fsp_str_dbg(fsp)));
4087
4088 become_root();
4089 sret = SMB_VFS_CHMOD(conn,
4090 fsp->fsp_name->base_name,
4091 posix_perms);
4092 unbecome_root();
4093 }
4094
4095 if (sret == -1) {
4096 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4097 "failed. Error = %s.\n",
4098 fsp_str_dbg(fsp),
4099 (unsigned int)posix_perms,
4100 strerror(errno)));
4101 free_canon_ace_list(file_ace_list);
4102 free_canon_ace_list(dir_ace_list);
4103 return map_nt_error_from_unix(errno);
4104 }
4105 }
4106 }
4107 }
4108
4109 free_canon_ace_list(file_ace_list);
4110 free_canon_ace_list(dir_ace_list);
4111
4112 /* Ensure the stat struct in the fsp is correct. */
4113 status = vfs_stat_fsp(fsp);
4114
4115 return NT_STATUS_OK;
4116 }
4117
4118 /****************************************************************************
4119 Get the actual group bits stored on a file with an ACL. Has no effect if
4120 the file has no ACL. Needed in dosmode code where the stat() will return
4121 the mask bits, not the real group bits, for a file with an ACL.
4122 ****************************************************************************/
4123
4124 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4125 {
4126 int entry_id = SMB_ACL_FIRST_ENTRY;
4127 SMB_ACL_ENTRY_T entry;
4128 SMB_ACL_T posix_acl;
4129 int result = -1;
4130
4131 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4132 if (posix_acl == (SMB_ACL_T)NULL)
4133 return -1;
4134
4135 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4136 SMB_ACL_TAG_T tagtype;
4137 SMB_ACL_PERMSET_T permset;
4138
4139 entry_id = SMB_ACL_NEXT_ENTRY;
4140
4141 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4142 break;
4143
4144 if (tagtype == SMB_ACL_GROUP_OBJ) {
4145 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4146 break;
4147 } else {
4148 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4149 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4150 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4151 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4152 result = 0;
4153 break;
4154 }
4155 }
4156 }
4157 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4158 return result;
4159 }
4160
4161 /****************************************************************************
4162 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4163 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4164 ****************************************************************************/
4165
4166 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4167 {
4168 int entry_id = SMB_ACL_FIRST_ENTRY;
4169 SMB_ACL_ENTRY_T entry;
4170 int num_entries = 0;
4171
4172 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4173 SMB_ACL_TAG_T tagtype;
4174 SMB_ACL_PERMSET_T permset;
4175 mode_t perms;
4176
4177 entry_id = SMB_ACL_NEXT_ENTRY;
4178
4179 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4180 return -1;
4181
4182 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4183 return -1;
4184
4185 num_entries++;
4186
4187 switch(tagtype) {
4188 case SMB_ACL_USER_OBJ:
4189 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4190 break;
4191 case SMB_ACL_GROUP_OBJ:
4192 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4193 break;
4194 case SMB_ACL_MASK:
4195 /*
4196 * FIXME: The ACL_MASK entry permissions should really be set to
4197 * the union of the permissions of all ACL_USER,
4198 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4199 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4200 */
4201 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4202 break;
4203 case SMB_ACL_OTHER:
4204 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4205 break;
4206 default:
4207 continue;
4208 }
4209
4210 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4211 return -1;
4212
4213 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4214 return -1;
4215 }
4216
4217 /*
4218 * If this is a simple 3 element ACL or no elements then it's a standard
4219 * UNIX permission set. Just use chmod...
4220 */
4221
4222 if ((num_entries == 3) || (num_entries == 0))
4223 return -1;
4224
4225 return 0;
4226 }
4227
4228 /****************************************************************************
4229 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4230 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4231 resulting ACL on TO. Note that name is in UNIX character set.
4232 ****************************************************************************/
4233
4234 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4235 {
4236 SMB_ACL_T posix_acl = NULL;
4237 int ret = -1;
4238
4239 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4240 return -1;
4241
4242 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4243 goto done;
4244
4245 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4246
4247 done:
4248
4249 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4250 return ret;
4251 }
4252
4253 /****************************************************************************
4254 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4255 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4256 Note that name is in UNIX character set.
4257 ****************************************************************************/
4258
4259 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4260 {
4261 return copy_access_posix_acl(conn, name, name, mode);
4262 }
4263
4264 /****************************************************************************
4265 Check for an existing default POSIX ACL on a directory.
4266 ****************************************************************************/
4267
4268 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4269 {
4270 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4271 bool has_acl = False;
4272 SMB_ACL_ENTRY_T entry;
4273
4274 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4275 has_acl = True;
4276 }
4277
4278 if (def_acl) {
4279 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4280 }
4281 return has_acl;
4282 }
4283
4284 /****************************************************************************
4285 If the parent directory has no default ACL but it does have an Access ACL,
4286 inherit this Access ACL to file name.
4287 ****************************************************************************/
4288
4289 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4290 const char *name, mode_t mode)
4291 {
4292 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4293 return 0;
4294
4295 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4296 }
4297
4298 /****************************************************************************
4299 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4300 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4301 ****************************************************************************/
4302
4303 int fchmod_acl(files_struct *fsp, mode_t mode)
4304 {
4305 connection_struct *conn = fsp->conn;
4306 SMB_ACL_T posix_acl = NULL;
4307 int ret = -1;
4308
4309 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4310 return -1;
4311
4312 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4313 goto done;
4314
4315 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4316
4317 done:
4318
4319 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4320 return ret;
4321 }
4322
4323 /****************************************************************************
4324 Map from wire type to permset.
4325 ****************************************************************************/
4326
4327 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4328 {
4329 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4330 return False;
4331 }
4332
4333 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4334 return False;
4335 }
4336
4337 if (wire_perm & SMB_POSIX_ACL_READ) {
4338 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4339 return False;
4340 }
4341 }
4342 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4343 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4344 return False;
4345 }
4346 }
4347 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4348 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4349 return False;
4350 }
4351 }
4352 return True;
4353 }
4354
4355 /****************************************************************************
4356 Map from wire type to tagtype.
4357 ****************************************************************************/
4358
4359 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4360 {
4361 switch (wire_tt) {
4362 case SMB_POSIX_ACL_USER_OBJ:
4363 *p_tt = SMB_ACL_USER_OBJ;
4364 break;
4365 case SMB_POSIX_ACL_USER:
4366 *p_tt = SMB_ACL_USER;
4367 break;
4368 case SMB_POSIX_ACL_GROUP_OBJ:
4369 *p_tt = SMB_ACL_GROUP_OBJ;
4370 break;
4371 case SMB_POSIX_ACL_GROUP:
4372 *p_tt = SMB_ACL_GROUP;
4373 break;
4374 case SMB_POSIX_ACL_MASK:
4375 *p_tt = SMB_ACL_MASK;
4376 break;
4377 case SMB_POSIX_ACL_OTHER:
4378 *p_tt = SMB_ACL_OTHER;
4379 break;
4380 default:
4381 return False;
4382 }
4383 return True;
4384 }
4385
4386 /****************************************************************************
4387 Create a new POSIX acl from wire permissions.
4388 FIXME ! How does the share mask/mode fit into this.... ?
4389 ****************************************************************************/
4390
4391 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4392 {
4393 unsigned int i;
4394 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4395
4396 if (the_acl == NULL) {
4397 return NULL;
4398 }
4399
4400 for (i = 0; i < num_acls; i++) {
4401 SMB_ACL_ENTRY_T the_entry;
4402 SMB_ACL_PERMSET_T the_permset;
4403 SMB_ACL_TAG_T tag_type;
4404
4405 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4406 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4407 i, strerror(errno) ));
4408 goto fail;
4409 }
4410
4411 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4412 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4413 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4414 goto fail;
4415 }
4416
4417 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4418 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4419 i, strerror(errno) ));
4420 goto fail;
4421 }
4422
4423 /* Get the permset pointer from the new ACL entry. */
4424 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4425 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4426 i, strerror(errno) ));
4427 goto fail;
4428 }
4429
4430 /* Map from wire to permissions. */
4431 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4432 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4433 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4434 goto fail;
4435 }
4436
4437 /* Now apply to the new ACL entry. */
4438 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4439 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4440 i, strerror(errno) ));
4441 goto fail;
4442 }
4443
4444 if (tag_type == SMB_ACL_USER) {
4445 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4446 uid_t uid = (uid_t)uidval;
4447 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4448 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4449 (unsigned int)uid, i, strerror(errno) ));
4450 goto fail;
4451 }
4452 }
4453
4454 if (tag_type == SMB_ACL_GROUP) {
4455 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4456 gid_t gid = (uid_t)gidval;
4457 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4458 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4459 (unsigned int)gid, i, strerror(errno) ));
4460 goto fail;
4461 }
4462 }
4463 }
4464
4465 return the_acl;
4466
4467 fail:
4468
4469 if (the_acl != NULL) {
4470 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4471 }
4472 return NULL;
4473 }
4474
4475 /****************************************************************************
4476 Calls from UNIX extensions - Default POSIX ACL set.
4477 If num_def_acls == 0 and not a directory just return. If it is a directory
4478 and num_def_acls == 0 then remove the default acl. Else set the default acl
4479 on the directory.
4480 ****************************************************************************/
4481
4482 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4483 uint16 num_def_acls, const char *pdata)
4484 {
4485 SMB_ACL_T def_acl = NULL;
4486
4487 if (!S_ISDIR(psbuf->st_ex_mode)) {
4488 if (num_def_acls) {
4489 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4490 errno = EISDIR;
4491 return False;
4492 } else {
4493 return True;
4494 }
4495 }
4496
4497 if (!num_def_acls) {
4498 /* Remove the default ACL. */
4499 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4500 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4501 fname, strerror(errno) ));
4502 return False;
4503 }
4504 return True;
4505 }
4506
4507 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4508 return False;
4509 }
4510
4511 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4512 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4513 fname, strerror(errno) ));
4514 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4515 return False;
4516 }
4517
4518 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4519 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4520 return True;
4521 }
4522
4523 /****************************************************************************
4524 Remove an ACL from a file. As we don't have acl_delete_entry() available
4525 we must read the current acl and copy all entries except MASK, USER and GROUP
4526 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4527 removed.
4528 FIXME ! How does the share mask/mode fit into this.... ?
4529 ****************************************************************************/
4530
4531 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4532 {
4533 SMB_ACL_T file_acl = NULL;
4534 int entry_id = SMB_ACL_FIRST_ENTRY;
4535 SMB_ACL_ENTRY_T entry;
4536 bool ret = False;
4537 /* Create a new ACL with only 3 entries, u/g/w. */
4538 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4539 SMB_ACL_ENTRY_T user_ent = NULL;
4540 SMB_ACL_ENTRY_T group_ent = NULL;
4541 SMB_ACL_ENTRY_T other_ent = NULL;
4542
4543 if (new_file_acl == NULL) {
4544 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4545 return False;
4546 }
4547
4548 /* Now create the u/g/w entries. */
4549 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4550 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4551 fname, strerror(errno) ));
4552 goto done;
4553 }
4554 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4555 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4556 fname, strerror(errno) ));
4557 goto done;
4558 }
4559
4560 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4561 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4562 fname, strerror(errno) ));
4563 goto done;
4564 }
4565 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4566 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4567 fname, strerror(errno) ));
4568 goto done;
4569 }
4570
4571 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4572 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4573 fname, strerror(errno) ));
4574 goto done;
4575 }
4576 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4577 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4578 fname, strerror(errno) ));
4579 goto done;
4580 }
4581
4582 /* Get the current file ACL. */
4583 if (fsp && fsp->fh->fd != -1) {
4584 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4585 } else {
4586 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4587 }
4588
4589 if (file_acl == NULL) {
4590 /* This is only returned if an error occurred. Even for a file with
4591 no acl a u/g/w acl should be returned. */
4592 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4593 fname, strerror(errno) ));
4594 goto done;
4595 }
4596
4597 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4598 SMB_ACL_TAG_T tagtype;
4599 SMB_ACL_PERMSET_T permset;
4600
4601 entry_id = SMB_ACL_NEXT_ENTRY;
4602
4603 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4604 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4605 fname, strerror(errno) ));
4606 goto done;
4607 }
4608
4609 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4610 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4611 fname, strerror(errno) ));
4612 goto done;
4613 }
4614
4615 if (tagtype == SMB_ACL_USER_OBJ) {
4616 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_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 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4621 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4622 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4623 fname, strerror(errno) ));
4624 }
4625 } else if (tagtype == SMB_ACL_OTHER) {
4626 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4627 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4628 fname, strerror(errno) ));
4629 }
4630 }
4631 }
4632
4633 /* Set the new empty file ACL. */
4634 if (fsp && fsp->fh->fd != -1) {
4635 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4636 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4637 fname, strerror(errno) ));
4638 goto done;
4639 }
4640 } else {
4641 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4642 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4643 fname, strerror(errno) ));
4644 goto done;
4645 }
4646 }
4647
4648 ret = True;
4649
4650 done:
4651
4652 if (file_acl) {
4653 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4654 }
4655 if (new_file_acl) {
4656 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4657 }
4658 return ret;
4659 }
4660
4661 /****************************************************************************
4662 Calls from UNIX extensions - POSIX ACL set.
4663 If num_def_acls == 0 then read/modify/write acl after removing all entries
4664 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4665 ****************************************************************************/
4666
4667 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4668 {
4669 SMB_ACL_T file_acl = NULL;
4670
4671 if (!num_acls) {
4672 /* Remove the ACL from the file. */
4673 return remove_posix_acl(conn, fsp, fname);
4674 }
4675
4676 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4677 return False;
4678 }
4679
4680 if (fsp && fsp->fh->fd != -1) {
4681 /* The preferred way - use an open fd. */
4682 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4683 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4684 fname, strerror(errno) ));
4685 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4686 return False;
4687 }
4688 } else {
4689 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4690 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4691 fname, strerror(errno) ));
4692 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4693 return False;
4694 }
4695 }
4696
4697 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4698 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4699 return True;
4700 }
4701
4702 /********************************************************************
4703 Pull the NT ACL from a file on disk or the OpenEventlog() access
4704 check. Caller is responsible for freeing the returned security
4705 descriptor via TALLOC_FREE(). This is designed for dealing with
4706 user space access checks in smbd outside of the VFS. For example,
4707 checking access rights in OpenEventlog().
4708
4709 Assume we are dealing with files (for now)
4710 ********************************************************************/
4711
4712 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4713 {
4714 struct security_descriptor *psd, *ret_sd;
4715 connection_struct *conn;
4716 files_struct finfo;
4717 struct fd_handle fh;
4718 NTSTATUS status;
4719
4720 conn = talloc_zero(ctx, connection_struct);
4721 if (conn == NULL) {
4722 DEBUG(0, ("talloc failed\n"));
4723 return NULL;
4724 }
4725
4726 if (!(conn->params = talloc(conn, struct share_params))) {
4727 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4728 TALLOC_FREE(conn);
4729 return NULL;
4730 }
4731
4732 conn->params->service = -1;
4733
4734 set_conn_connectpath(conn, "/");
4735
4736 if (!smbd_vfs_init(conn)) {
4737 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4738 conn_free(conn);
4739 return NULL;
4740 }
4741
4742 ZERO_STRUCT( finfo );
4743 ZERO_STRUCT( fh );
4744
4745 finfo.fnum = -1;
4746 finfo.conn = conn;
4747 finfo.fh = &fh;
4748 finfo.fh->fd = -1;
4749
4750 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4751 &finfo.fsp_name);
4752 if (!NT_STATUS_IS_OK(status)) {
4753 conn_free(conn);
4754 return NULL;
4755 }
4756
4757 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4758 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4759 TALLOC_FREE(finfo.fsp_name);
4760 conn_free(conn);
4761 return NULL;
4762 }
4763
4764 ret_sd = dup_sec_desc( ctx, psd );
4765
4766 TALLOC_FREE(finfo.fsp_name);
4767 conn_free(conn);
4768
4769 return ret_sd;
4770 }
4771
4772 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4773
4774 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4775 const char *name,
4776 SMB_STRUCT_STAT *psbuf,
4777 struct security_descriptor **ppdesc)
4778 {
4779 struct dom_sid owner_sid, group_sid;
4780 size_t size = 0;
4781 struct security_ace aces[4];
4782 uint32_t access_mask = 0;
4783 mode_t mode = psbuf->st_ex_mode;
4784 struct security_acl *new_dacl = NULL;
4785 int idx = 0;
4786
4787 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4788 name, (int)mode ));
4789
4790 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4791 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4792
4793 /*
4794 We provide up to 4 ACEs
4795 - Owner
4796 - Group
4797 - Everyone
4798 - NT System
4799 */
4800
4801 if (mode & S_IRUSR) {
4802 if (mode & S_IWUSR) {
4803 access_mask |= SEC_RIGHTS_FILE_ALL;
4804 } else {
4805 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4806 }
4807 }
4808 if (mode & S_IWUSR) {
4809 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4810 }
4811
4812 init_sec_ace(&aces[idx],
4813 &owner_sid,
4814 SEC_ACE_TYPE_ACCESS_ALLOWED,
4815 access_mask,
4816 0);
4817 idx++;
4818
4819 access_mask = 0;
4820 if (mode & S_IRGRP) {
4821 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4822 }
4823 if (mode & S_IWGRP) {
4824 /* note that delete is not granted - this matches posix behaviour */
4825 access_mask |= SEC_RIGHTS_FILE_WRITE;
4826 }
4827 if (access_mask) {
4828 init_sec_ace(&aces[idx],
4829 &group_sid,
4830 SEC_ACE_TYPE_ACCESS_ALLOWED,
4831 access_mask,
4832 0);
4833 idx++;
4834 }
4835
4836 access_mask = 0;
4837 if (mode & S_IROTH) {
4838 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4839 }
4840 if (mode & S_IWOTH) {
4841 access_mask |= SEC_RIGHTS_FILE_WRITE;
4842 }
4843 if (access_mask) {
4844 init_sec_ace(&aces[idx],
4845 &global_sid_World,
4846 SEC_ACE_TYPE_ACCESS_ALLOWED,
4847 access_mask,
4848 0);
4849 idx++;
4850 }
4851
4852 init_sec_ace(&aces[idx],
4853 &global_sid_System,
4854 SEC_ACE_TYPE_ACCESS_ALLOWED,
4855 SEC_RIGHTS_FILE_ALL,
4856 0);
4857 idx++;
4858
4859 new_dacl = make_sec_acl(ctx,
4860 NT4_ACL_REVISION,
4861 idx,
4862 aces);
4863
4864 if (!new_dacl) {
4865 return NT_STATUS_NO_MEMORY;
4866 }
4867
4868 *ppdesc = make_sec_desc(ctx,
4869 SECURITY_DESCRIPTOR_REVISION_1,
4870 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4871 &owner_sid,
4872 &group_sid,
4873 NULL,
4874 new_dacl,
4875 &size);
4876 if (!*ppdesc) {
4877 return NT_STATUS_NO_MEMORY;
4878 }
4879 return NT_STATUS_OK;
4880 }