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tevent: tevent_schedule_immediate never fails
[Samba/id10ts.git] / source3 / smbd / posix_acls.c
blob2ed64c2472f8dd509d11bf90955d4df5b2ba2431
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 = (char *)SMB_MALLOC(*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 SAFE_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 SAFE_FREE(paie);
308 }
309 for (paie = pal->def_entry_list; paie; paie = paie_next) {
310 paie_next = paie->next;
311 SAFE_FREE(paie);
312 }
313 SAFE_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 = SMB_MALLOC_P(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 SAFE_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 = SMB_MALLOC_P(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 = SMB_MALLOC_P(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 SAFE_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 = SMB_MALLOC_P(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 = (char *)SMB_MALLOC(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 SAFE_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = (char *)SMB_MALLOC(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 SAFE_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 SAFE_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 = (char *)SMB_MALLOC(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 SAFE_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = (char *)SMB_MALLOC(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 SAFE_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 SAFE_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 SAFE_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 = SMB_MALLOC_P(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 SAFE_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 SAFE_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 SAFE_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 bool got_user = False;
1366 bool got_grp = False;
1367 bool got_other = False;
1368 canon_ace *pace_other = NULL;
1369
1370 for (pace = *pp_ace; pace; pace = pace->next) {
1371 if (pace->type == SMB_ACL_USER_OBJ) {
1372
1373 if (setting_acl)
1374 apply_default_perms(params, is_directory, pace, S_IRUSR);
1375 got_user = True;
1376
1377 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1378
1379 /*
1380 * Ensure create mask/force create mode is respected on set.
1381 */
1382
1383 if (setting_acl)
1384 apply_default_perms(params, is_directory, pace, S_IRGRP);
1385 got_grp = True;
1386
1387 } else if (pace->type == SMB_ACL_OTHER) {
1388
1389 /*
1390 * Ensure create mask/force create mode is respected on set.
1391 */
1392
1393 if (setting_acl)
1394 apply_default_perms(params, is_directory, pace, S_IROTH);
1395 got_other = True;
1396 pace_other = pace;
1397 }
1398 }
1399
1400 if (!got_user) {
1401 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1402 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1403 return False;
1404 }
1405
1406 ZERO_STRUCTP(pace);
1407 pace->type = SMB_ACL_USER_OBJ;
1408 pace->owner_type = UID_ACE;
1409 pace->unix_ug.uid = pst->st_ex_uid;
1410 pace->trustee = *pfile_owner_sid;
1411 pace->attr = ALLOW_ACE;
1412 /* Start with existing permissions, principle of least
1413 surprises for the user. */
1414 pace->perms = pst->st_ex_mode;
1415
1416 if (setting_acl) {
1417 /* See if the owning user is in any of the other groups in
1418 the ACE, or if there's a matching user entry.
1419 If so, OR in the permissions from that entry. */
1420
1421 canon_ace *pace_iter;
1422
1423 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1424 if (pace_iter->type == SMB_ACL_USER &&
1425 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1426 pace->perms |= pace_iter->perms;
1427 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1428 if (uid_entry_in_group(conn, pace, pace_iter)) {
1429 pace->perms |= pace_iter->perms;
1430 }
1431 }
1432 }
1433
1434 if (pace->perms == 0) {
1435 /* If we only got an "everyone" perm, just use that. */
1436 if (got_other)
1437 pace->perms = pace_other->perms;
1438 }
1439
1440 apply_default_perms(params, is_directory, pace, S_IRUSR);
1441 } else {
1442 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1443 }
1444
1445 DLIST_ADD(*pp_ace, pace);
1446 }
1447
1448 if (!got_grp) {
1449 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1450 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1451 return False;
1452 }
1453
1454 ZERO_STRUCTP(pace);
1455 pace->type = SMB_ACL_GROUP_OBJ;
1456 pace->owner_type = GID_ACE;
1457 pace->unix_ug.uid = pst->st_ex_gid;
1458 pace->trustee = *pfile_grp_sid;
1459 pace->attr = ALLOW_ACE;
1460 if (setting_acl) {
1461 /* If we only got an "everyone" perm, just use that. */
1462 if (got_other)
1463 pace->perms = pace_other->perms;
1464 else
1465 pace->perms = 0;
1466 apply_default_perms(params, is_directory, pace, S_IRGRP);
1467 } else {
1468 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1469 }
1470
1471 DLIST_ADD(*pp_ace, pace);
1472 }
1473
1474 if (!got_other) {
1475 if ((pace = SMB_MALLOC_P(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 }
1494
1495 return True;
1496 }
1497
1498 /****************************************************************************
1499 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1500 If it does not have them, check if there are any entries where the trustee is the
1501 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1502 Note we must not do this to default directory ACLs.
1503 ****************************************************************************/
1504
1505 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1506 {
1507 bool got_user_obj, got_group_obj;
1508 canon_ace *current_ace;
1509 int i, entries;
1510
1511 entries = count_canon_ace_list(ace);
1512 got_user_obj = False;
1513 got_group_obj = False;
1514
1515 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1516 if (current_ace->type == SMB_ACL_USER_OBJ)
1517 got_user_obj = True;
1518 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1519 got_group_obj = True;
1520 }
1521 if (got_user_obj && got_group_obj) {
1522 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1523 return;
1524 }
1525
1526 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1527 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1528 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1529 current_ace->type = SMB_ACL_USER_OBJ;
1530 got_user_obj = True;
1531 }
1532 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1533 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1534 current_ace->type = SMB_ACL_GROUP_OBJ;
1535 got_group_obj = True;
1536 }
1537 }
1538 if (!got_user_obj)
1539 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1540 if (!got_group_obj)
1541 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1542 }
1543
1544 /****************************************************************************
1545 Unpack a struct security_descriptor into two canonical ace lists.
1546 ****************************************************************************/
1547
1548 static bool create_canon_ace_lists(files_struct *fsp,
1549 const SMB_STRUCT_STAT *pst,
1550 struct dom_sid *pfile_owner_sid,
1551 struct dom_sid *pfile_grp_sid,
1552 canon_ace **ppfile_ace,
1553 canon_ace **ppdir_ace,
1554 const struct security_acl *dacl)
1555 {
1556 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1557 canon_ace *file_ace = NULL;
1558 canon_ace *dir_ace = NULL;
1559 canon_ace *current_ace = NULL;
1560 bool got_dir_allow = False;
1561 bool got_file_allow = False;
1562 int i, j;
1563
1564 *ppfile_ace = NULL;
1565 *ppdir_ace = NULL;
1566
1567 /*
1568 * Convert the incoming ACL into a more regular form.
1569 */
1570
1571 for(i = 0; i < dacl->num_aces; i++) {
1572 struct security_ace *psa = &dacl->aces[i];
1573
1574 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1575 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1576 return False;
1577 }
1578
1579 if (nt4_compatible_acls()) {
1580 /*
1581 * The security mask may be UNIX_ACCESS_NONE which should map into
1582 * no permissions (we overload the WRITE_OWNER bit for this) or it
1583 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1584 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1585 */
1586
1587 /*
1588 * Convert GENERIC bits to specific bits.
1589 */
1590
1591 se_map_generic(&psa->access_mask, &file_generic_mapping);
1592
1593 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1594
1595 if(psa->access_mask != UNIX_ACCESS_NONE)
1596 psa->access_mask &= ~UNIX_ACCESS_NONE;
1597 }
1598 }
1599
1600 /*
1601 * Deal with the fact that NT 4.x re-writes the canonical format
1602 * that we return for default ACLs. If a directory ACE is identical
1603 * to a inherited directory ACE then NT changes the bits so that the
1604 * first ACE is set to OI|IO and the second ACE for this SID is set
1605 * to CI. We need to repair this. JRA.
1606 */
1607
1608 for(i = 0; i < dacl->num_aces; i++) {
1609 struct security_ace *psa1 = &dacl->aces[i];
1610
1611 for (j = i + 1; j < dacl->num_aces; j++) {
1612 struct security_ace *psa2 = &dacl->aces[j];
1613
1614 if (psa1->access_mask != psa2->access_mask)
1615 continue;
1616
1617 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1618 continue;
1619
1620 /*
1621 * Ok - permission bits and SIDs are equal.
1622 * Check if flags were re-written.
1623 */
1624
1625 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1626
1627 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1628 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1629
1630 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1631
1632 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1633 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1634
1635 }
1636 }
1637 }
1638
1639 for(i = 0; i < dacl->num_aces; i++) {
1640 struct security_ace *psa = &dacl->aces[i];
1641
1642 /*
1643 * Create a canon_ace entry representing this NT DACL ACE.
1644 */
1645
1646 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1647 free_canon_ace_list(file_ace);
1648 free_canon_ace_list(dir_ace);
1649 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1650 return False;
1651 }
1652
1653 ZERO_STRUCTP(current_ace);
1654
1655 sid_copy(&current_ace->trustee, &psa->trustee);
1656
1657 /*
1658 * Try and work out if the SID is a user or group
1659 * as we need to flag these differently for POSIX.
1660 * Note what kind of a POSIX ACL this should map to.
1661 */
1662
1663 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1664 current_ace->owner_type = WORLD_ACE;
1665 current_ace->unix_ug.world = -1;
1666 current_ace->type = SMB_ACL_OTHER;
1667 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1668 current_ace->owner_type = UID_ACE;
1669 current_ace->unix_ug.uid = pst->st_ex_uid;
1670 current_ace->type = SMB_ACL_USER_OBJ;
1671
1672 /*
1673 * The Creator Owner entry only specifies inheritable permissions,
1674 * never access permissions. WinNT doesn't always set the ACE to
1675 * INHERIT_ONLY, though.
1676 */
1677
1678 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1679
1680 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1681 current_ace->owner_type = GID_ACE;
1682 current_ace->unix_ug.gid = pst->st_ex_gid;
1683 current_ace->type = SMB_ACL_GROUP_OBJ;
1684
1685 /*
1686 * The Creator Group entry only specifies inheritable permissions,
1687 * never access permissions. WinNT doesn't always set the ACE to
1688 * INHERIT_ONLY, though.
1689 */
1690 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1691
1692 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1693 current_ace->owner_type = UID_ACE;
1694 /* If it's the owning user, this is a user_obj, not
1695 * a user. */
1696 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1697 current_ace->type = SMB_ACL_USER_OBJ;
1698 } else {
1699 current_ace->type = SMB_ACL_USER;
1700 }
1701 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1702 current_ace->owner_type = GID_ACE;
1703 /* If it's the primary group, this is a group_obj, not
1704 * a group. */
1705 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1706 current_ace->type = SMB_ACL_GROUP_OBJ;
1707 } else {
1708 current_ace->type = SMB_ACL_GROUP;
1709 }
1710 } else {
1711 /*
1712 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1713 */
1714
1715 if (non_mappable_sid(&psa->trustee)) {
1716 DEBUG(10, ("create_canon_ace_lists: ignoring "
1717 "non-mappable SID %s\n",
1718 sid_string_dbg(&psa->trustee)));
1719 SAFE_FREE(current_ace);
1720 continue;
1721 }
1722
1723 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1724 DEBUG(10, ("create_canon_ace_lists: ignoring "
1725 "unknown or foreign SID %s\n",
1726 sid_string_dbg(&psa->trustee)));
1727 SAFE_FREE(current_ace);
1728 continue;
1729 }
1730
1731 free_canon_ace_list(file_ace);
1732 free_canon_ace_list(dir_ace);
1733 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1734 "%s to uid or gid.\n",
1735 sid_string_dbg(&current_ace->trustee)));
1736 SAFE_FREE(current_ace);
1737 return False;
1738 }
1739
1740 /*
1741 * Map the given NT permissions into a UNIX mode_t containing only
1742 * S_I(R|W|X)USR bits.
1743 */
1744
1745 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1746 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1747
1748 /* Store the ace_flag. */
1749 current_ace->ace_flags = psa->flags;
1750
1751 /*
1752 * Now add the created ace to either the file list, the directory
1753 * list, or both. We *MUST* preserve the order here (hence we use
1754 * DLIST_ADD_END) as NT ACLs are order dependent.
1755 */
1756
1757 if (fsp->is_directory) {
1758
1759 /*
1760 * We can only add to the default POSIX ACE list if the ACE is
1761 * designed to be inherited by both files and directories.
1762 */
1763
1764 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1765 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1766
1767 canon_ace *current_dir_ace = current_ace;
1768 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1769
1770 /*
1771 * Note if this was an allow ace. We can't process
1772 * any further deny ace's after this.
1773 */
1774
1775 if (current_ace->attr == ALLOW_ACE)
1776 got_dir_allow = True;
1777
1778 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1779 DEBUG(0,("create_canon_ace_lists: "
1780 "malformed ACL in "
1781 "inheritable ACL! Deny entry "
1782 "after Allow entry. Failing "
1783 "to set on file %s.\n",
1784 fsp_str_dbg(fsp)));
1785 free_canon_ace_list(file_ace);
1786 free_canon_ace_list(dir_ace);
1787 return False;
1788 }
1789
1790 if( DEBUGLVL( 10 )) {
1791 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1792 print_canon_ace( current_ace, 0);
1793 }
1794
1795 /*
1796 * If this is not an inherit only ACE we need to add a duplicate
1797 * to the file acl.
1798 */
1799
1800 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1801 canon_ace *dup_ace = dup_canon_ace(current_ace);
1802
1803 if (!dup_ace) {
1804 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1805 free_canon_ace_list(file_ace);
1806 free_canon_ace_list(dir_ace);
1807 return False;
1808 }
1809
1810 /*
1811 * We must not free current_ace here as its
1812 * pointer is now owned by the dir_ace list.
1813 */
1814 current_ace = dup_ace;
1815 /* We've essentially split this ace into two,
1816 * and added the ace with inheritance request
1817 * bits to the directory ACL. Drop those bits for
1818 * the ACE we're adding to the file list. */
1819 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1820 SEC_ACE_FLAG_CONTAINER_INHERIT|
1821 SEC_ACE_FLAG_INHERIT_ONLY);
1822 } else {
1823 /*
1824 * We must not free current_ace here as its
1825 * pointer is now owned by the dir_ace list.
1826 */
1827 current_ace = NULL;
1828 }
1829
1830 /*
1831 * current_ace is now either owned by file_ace
1832 * or is NULL. We can safely operate on current_dir_ace
1833 * to treat mapping for default acl entries differently
1834 * than access acl entries.
1835 */
1836
1837 if (current_dir_ace->owner_type == UID_ACE) {
1838 /*
1839 * We already decided above this is a uid,
1840 * for default acls ace's only CREATOR_OWNER
1841 * maps to ACL_USER_OBJ. All other uid
1842 * ace's are ACL_USER.
1843 */
1844 if (dom_sid_equal(&current_dir_ace->trustee,
1845 &global_sid_Creator_Owner)) {
1846 current_dir_ace->type = SMB_ACL_USER_OBJ;
1847 } else {
1848 current_dir_ace->type = SMB_ACL_USER;
1849 }
1850 }
1851
1852 if (current_dir_ace->owner_type == GID_ACE) {
1853 /*
1854 * We already decided above this is a gid,
1855 * for default acls ace's only CREATOR_GROUP
1856 * maps to ACL_GROUP_OBJ. All other uid
1857 * ace's are ACL_GROUP.
1858 */
1859 if (dom_sid_equal(&current_dir_ace->trustee,
1860 &global_sid_Creator_Group)) {
1861 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1862 } else {
1863 current_dir_ace->type = SMB_ACL_GROUP;
1864 }
1865 }
1866 }
1867 }
1868
1869 /*
1870 * Only add to the file ACL if not inherit only.
1871 */
1872
1873 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1874 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1875
1876 /*
1877 * Note if this was an allow ace. We can't process
1878 * any further deny ace's after this.
1879 */
1880
1881 if (current_ace->attr == ALLOW_ACE)
1882 got_file_allow = True;
1883
1884 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1885 DEBUG(0,("create_canon_ace_lists: malformed "
1886 "ACL in file ACL ! Deny entry after "
1887 "Allow entry. Failing to set on file "
1888 "%s.\n", fsp_str_dbg(fsp)));
1889 free_canon_ace_list(file_ace);
1890 free_canon_ace_list(dir_ace);
1891 return False;
1892 }
1893
1894 if( DEBUGLVL( 10 )) {
1895 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1896 print_canon_ace( current_ace, 0);
1897 }
1898 all_aces_are_inherit_only = False;
1899 /*
1900 * We must not free current_ace here as its
1901 * pointer is now owned by the file_ace list.
1902 */
1903 current_ace = NULL;
1904 }
1905
1906 /*
1907 * Free if ACE was not added.
1908 */
1909
1910 SAFE_FREE(current_ace);
1911 }
1912
1913 if (fsp->is_directory && all_aces_are_inherit_only) {
1914 /*
1915 * Windows 2000 is doing one of these weird 'inherit acl'
1916 * traverses to conserve NTFS ACL resources. Just pretend
1917 * there was no DACL sent. JRA.
1918 */
1919
1920 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1921 free_canon_ace_list(file_ace);
1922 free_canon_ace_list(dir_ace);
1923 file_ace = NULL;
1924 dir_ace = NULL;
1925 } else {
1926 /*
1927 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1928 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1929 * entries can be converted to *_OBJ. Don't do this for the default
1930 * ACL, we will create them separately for this if needed inside
1931 * ensure_canon_entry_valid().
1932 */
1933 if (file_ace) {
1934 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1935 }
1936 }
1937
1938 *ppfile_ace = file_ace;
1939 *ppdir_ace = dir_ace;
1940
1941 return True;
1942 }
1943
1944 /****************************************************************************
1945 ASCII art time again... JRA :-).
1946
1947 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1948 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1949 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1950 allow or deny have been merged, so the same SID can only appear once in the deny
1951 list or once in the allow list.
1952
1953 We then process as follows :
1954
1955 ---------------------------------------------------------------------------
1956 First pass - look for a Everyone DENY entry.
1957
1958 If it is deny all (rwx) trunate the list at this point.
1959 Else, walk the list from this point and use the deny permissions of this
1960 entry as a mask on all following allow entries. Finally, delete
1961 the Everyone DENY entry (we have applied it to everything possible).
1962
1963 In addition, in this pass we remove any DENY entries that have
1964 no permissions (ie. they are a DENY nothing).
1965 ---------------------------------------------------------------------------
1966 Second pass - only deal with deny user entries.
1967
1968 DENY user1 (perms XXX)
1969
1970 new_perms = 0
1971 for all following allow group entries where user1 is in group
1972 new_perms |= group_perms;
1973
1974 user1 entry perms = new_perms & ~ XXX;
1975
1976 Convert the deny entry to an allow entry with the new perms and
1977 push to the end of the list. Note if the user was in no groups
1978 this maps to a specific allow nothing entry for this user.
1979
1980 The common case from the NT ACL choser (userX deny all) is
1981 optimised so we don't do the group lookup - we just map to
1982 an allow nothing entry.
1983
1984 What we're doing here is inferring the allow permissions the
1985 person setting the ACE on user1 wanted by looking at the allow
1986 permissions on the groups the user is currently in. This will
1987 be a snapshot, depending on group membership but is the best
1988 we can do and has the advantage of failing closed rather than
1989 open.
1990 ---------------------------------------------------------------------------
1991 Third pass - only deal with deny group entries.
1992
1993 DENY group1 (perms XXX)
1994
1995 for all following allow user entries where user is in group1
1996 user entry perms = user entry perms & ~ XXX;
1997
1998 If there is a group Everyone allow entry with permissions YYY,
1999 convert the group1 entry to an allow entry and modify its
2000 permissions to be :
2001
2002 new_perms = YYY & ~ XXX
2003
2004 and push to the end of the list.
2005
2006 If there is no group Everyone allow entry then convert the
2007 group1 entry to a allow nothing entry and push to the end of the list.
2008
2009 Note that the common case from the NT ACL choser (groupX deny all)
2010 cannot be optimised here as we need to modify user entries who are
2011 in the group to change them to a deny all also.
2012
2013 What we're doing here is modifying the allow permissions of
2014 user entries (which are more specific in POSIX ACLs) to mask
2015 out the explicit deny set on the group they are in. This will
2016 be a snapshot depending on current group membership but is the
2017 best we can do and has the advantage of failing closed rather
2018 than open.
2019 ---------------------------------------------------------------------------
2020 Fourth pass - cope with cumulative permissions.
2021
2022 for all allow user entries, if there exists an allow group entry with
2023 more permissive permissions, and the user is in that group, rewrite the
2024 allow user permissions to contain both sets of permissions.
2025
2026 Currently the code for this is #ifdef'ed out as these semantics make
2027 no sense to me. JRA.
2028 ---------------------------------------------------------------------------
2029
2030 Note we *MUST* do the deny user pass first as this will convert deny user
2031 entries into allow user entries which can then be processed by the deny
2032 group pass.
2033
2034 The above algorithm took a *lot* of thinking about - hence this
2035 explaination :-). JRA.
2036 ****************************************************************************/
2037
2038 /****************************************************************************
2039 Process a canon_ace list entries. This is very complex code. We need
2040 to go through and remove the "deny" permissions from any allow entry that matches
2041 the id of this entry. We have already refused any NT ACL that wasn't in correct
2042 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2043 we just remove it (to fail safe). We have already removed any duplicate ace
2044 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2045 allow entries.
2046 ****************************************************************************/
2047
2048 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2049 {
2050 canon_ace *ace_list = *pp_ace_list;
2051 canon_ace *curr_ace = NULL;
2052 canon_ace *curr_ace_next = NULL;
2053
2054 /* Pass 1 above - look for an Everyone, deny entry. */
2055
2056 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2057 canon_ace *allow_ace_p;
2058
2059 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2060
2061 if (curr_ace->attr != DENY_ACE)
2062 continue;
2063
2064 if (curr_ace->perms == (mode_t)0) {
2065
2066 /* Deny nothing entry - delete. */
2067
2068 DLIST_REMOVE(ace_list, curr_ace);
2069 continue;
2070 }
2071
2072 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2073 continue;
2074
2075 /* JRATEST - assert. */
2076 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2077
2078 if (curr_ace->perms == ALL_ACE_PERMS) {
2079
2080 /*
2081 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2082 * list at this point including this entry.
2083 */
2084
2085 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2086
2087 free_canon_ace_list( curr_ace );
2088 if (prev_entry)
2089 DLIST_REMOVE(ace_list, prev_entry);
2090 else {
2091 /* We deleted the entire list. */
2092 ace_list = NULL;
2093 }
2094 break;
2095 }
2096
2097 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2098
2099 /*
2100 * Only mask off allow entries.
2101 */
2102
2103 if (allow_ace_p->attr != ALLOW_ACE)
2104 continue;
2105
2106 allow_ace_p->perms &= ~curr_ace->perms;
2107 }
2108
2109 /*
2110 * Now it's been applied, remove it.
2111 */
2112
2113 DLIST_REMOVE(ace_list, curr_ace);
2114 }
2115
2116 /* Pass 2 above - deal with deny user entries. */
2117
2118 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2119 mode_t new_perms = (mode_t)0;
2120 canon_ace *allow_ace_p;
2121
2122 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2123
2124 if (curr_ace->attr != DENY_ACE)
2125 continue;
2126
2127 if (curr_ace->owner_type != UID_ACE)
2128 continue;
2129
2130 if (curr_ace->perms == ALL_ACE_PERMS) {
2131
2132 /*
2133 * Optimisation - this is a deny everything to this user.
2134 * Convert to an allow nothing and push to the end of the list.
2135 */
2136
2137 curr_ace->attr = ALLOW_ACE;
2138 curr_ace->perms = (mode_t)0;
2139 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2140 continue;
2141 }
2142
2143 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2144
2145 if (allow_ace_p->attr != ALLOW_ACE)
2146 continue;
2147
2148 /* We process GID_ACE and WORLD_ACE entries only. */
2149
2150 if (allow_ace_p->owner_type == UID_ACE)
2151 continue;
2152
2153 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2154 new_perms |= allow_ace_p->perms;
2155 }
2156
2157 /*
2158 * Convert to a allow entry, modify the perms and push to the end
2159 * of the list.
2160 */
2161
2162 curr_ace->attr = ALLOW_ACE;
2163 curr_ace->perms = (new_perms & ~curr_ace->perms);
2164 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2165 }
2166
2167 /* Pass 3 above - deal with deny group entries. */
2168
2169 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2170 canon_ace *allow_ace_p;
2171 canon_ace *allow_everyone_p = NULL;
2172
2173 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2174
2175 if (curr_ace->attr != DENY_ACE)
2176 continue;
2177
2178 if (curr_ace->owner_type != GID_ACE)
2179 continue;
2180
2181 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2182
2183 if (allow_ace_p->attr != ALLOW_ACE)
2184 continue;
2185
2186 /* Store a pointer to the Everyone allow, if it exists. */
2187 if (allow_ace_p->owner_type == WORLD_ACE)
2188 allow_everyone_p = allow_ace_p;
2189
2190 /* We process UID_ACE entries only. */
2191
2192 if (allow_ace_p->owner_type != UID_ACE)
2193 continue;
2194
2195 /* Mask off the deny group perms. */
2196
2197 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2198 allow_ace_p->perms &= ~curr_ace->perms;
2199 }
2200
2201 /*
2202 * Convert the deny to an allow with the correct perms and
2203 * push to the end of the list.
2204 */
2205
2206 curr_ace->attr = ALLOW_ACE;
2207 if (allow_everyone_p)
2208 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2209 else
2210 curr_ace->perms = (mode_t)0;
2211 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2212 }
2213
2214 /* Doing this fourth pass allows Windows semantics to be layered
2215 * on top of POSIX semantics. I'm not sure if this is desirable.
2216 * For example, in W2K ACLs there is no way to say, "Group X no
2217 * access, user Y full access" if user Y is a member of group X.
2218 * This seems completely broken semantics to me.... JRA.
2219 */
2220
2221 #if 0
2222 /* Pass 4 above - deal with allow entries. */
2223
2224 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2225 canon_ace *allow_ace_p;
2226
2227 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2228
2229 if (curr_ace->attr != ALLOW_ACE)
2230 continue;
2231
2232 if (curr_ace->owner_type != UID_ACE)
2233 continue;
2234
2235 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2236
2237 if (allow_ace_p->attr != ALLOW_ACE)
2238 continue;
2239
2240 /* We process GID_ACE entries only. */
2241
2242 if (allow_ace_p->owner_type != GID_ACE)
2243 continue;
2244
2245 /* OR in the group perms. */
2246
2247 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2248 curr_ace->perms |= allow_ace_p->perms;
2249 }
2250 }
2251 #endif
2252
2253 *pp_ace_list = ace_list;
2254 }
2255
2256 /****************************************************************************
2257 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2258 succeeding.
2259 ****************************************************************************/
2260
2261 static bool unpack_canon_ace(files_struct *fsp,
2262 const SMB_STRUCT_STAT *pst,
2263 struct dom_sid *pfile_owner_sid,
2264 struct dom_sid *pfile_grp_sid,
2265 canon_ace **ppfile_ace,
2266 canon_ace **ppdir_ace,
2267 uint32 security_info_sent,
2268 const struct security_descriptor *psd)
2269 {
2270 canon_ace *file_ace = NULL;
2271 canon_ace *dir_ace = NULL;
2272
2273 *ppfile_ace = NULL;
2274 *ppdir_ace = NULL;
2275
2276 if(security_info_sent == 0) {
2277 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2278 return False;
2279 }
2280
2281 /*
2282 * If no DACL then this is a chown only security descriptor.
2283 */
2284
2285 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2286 return True;
2287
2288 /*
2289 * Now go through the DACL and create the canon_ace lists.
2290 */
2291
2292 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2293 &file_ace, &dir_ace, psd->dacl))
2294 return False;
2295
2296 if ((file_ace == NULL) && (dir_ace == NULL)) {
2297 /* W2K traverse DACL set - ignore. */
2298 return True;
2299 }
2300
2301 /*
2302 * Go through the canon_ace list and merge entries
2303 * belonging to identical users of identical allow or deny type.
2304 * We can do this as all deny entries come first, followed by
2305 * all allow entries (we have mandated this before accepting this acl).
2306 */
2307
2308 print_canon_ace_list( "file ace - before merge", file_ace);
2309 merge_aces( &file_ace, false);
2310
2311 print_canon_ace_list( "dir ace - before merge", dir_ace);
2312 merge_aces( &dir_ace, true);
2313
2314 /*
2315 * NT ACLs are order dependent. Go through the acl lists and
2316 * process DENY entries by masking the allow entries.
2317 */
2318
2319 print_canon_ace_list( "file ace - before deny", file_ace);
2320 process_deny_list(fsp->conn, &file_ace);
2321
2322 print_canon_ace_list( "dir ace - before deny", dir_ace);
2323 process_deny_list(fsp->conn, &dir_ace);
2324
2325 /*
2326 * A well formed POSIX file or default ACL has at least 3 entries, a
2327 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2328 * and optionally a mask entry. Ensure this is the case.
2329 */
2330
2331 print_canon_ace_list( "file ace - before valid", file_ace);
2332
2333 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2334 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2335 free_canon_ace_list(file_ace);
2336 free_canon_ace_list(dir_ace);
2337 return False;
2338 }
2339
2340 print_canon_ace_list( "dir ace - before valid", dir_ace);
2341
2342 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2343 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2344 free_canon_ace_list(file_ace);
2345 free_canon_ace_list(dir_ace);
2346 return False;
2347 }
2348
2349 print_canon_ace_list( "file ace - return", file_ace);
2350 print_canon_ace_list( "dir ace - return", dir_ace);
2351
2352 *ppfile_ace = file_ace;
2353 *ppdir_ace = dir_ace;
2354 return True;
2355
2356 }
2357
2358 /******************************************************************************
2359 When returning permissions, try and fit NT display
2360 semantics if possible. Note the the canon_entries here must have been malloced.
2361 The list format should be - first entry = owner, followed by group and other user
2362 entries, last entry = other.
2363
2364 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2365 are not ordered, and match on the most specific entry rather than walking a list,
2366 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2367
2368 Entry 0: owner : deny all except read and write.
2369 Entry 1: owner : allow read and write.
2370 Entry 2: group : deny all except read.
2371 Entry 3: group : allow read.
2372 Entry 4: Everyone : allow read.
2373
2374 But NT cannot display this in their ACL editor !
2375 ********************************************************************************/
2376
2377 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2378 {
2379 canon_ace *l_head = *pp_list_head;
2380 canon_ace *owner_ace = NULL;
2381 canon_ace *other_ace = NULL;
2382 canon_ace *ace = NULL;
2383
2384 for (ace = l_head; ace; ace = ace->next) {
2385 if (ace->type == SMB_ACL_USER_OBJ)
2386 owner_ace = ace;
2387 else if (ace->type == SMB_ACL_OTHER) {
2388 /* Last ace - this is "other" */
2389 other_ace = ace;
2390 }
2391 }
2392
2393 if (!owner_ace || !other_ace) {
2394 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2395 filename ));
2396 return;
2397 }
2398
2399 /*
2400 * The POSIX algorithm applies to owner first, and other last,
2401 * so ensure they are arranged in this order.
2402 */
2403
2404 if (owner_ace) {
2405 DLIST_PROMOTE(l_head, owner_ace);
2406 }
2407
2408 if (other_ace) {
2409 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2410 }
2411
2412 /* We have probably changed the head of the list. */
2413
2414 *pp_list_head = l_head;
2415 }
2416
2417 /****************************************************************************
2418 Create a linked list of canonical ACE entries.
2419 ****************************************************************************/
2420
2421 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2422 const char *fname, SMB_ACL_T posix_acl,
2423 const SMB_STRUCT_STAT *psbuf,
2424 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2425 {
2426 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2427 canon_ace *l_head = NULL;
2428 canon_ace *ace = NULL;
2429 canon_ace *next_ace = NULL;
2430 int entry_id = SMB_ACL_FIRST_ENTRY;
2431 SMB_ACL_ENTRY_T entry;
2432 size_t ace_count;
2433
2434 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2435 SMB_ACL_TAG_T tagtype;
2436 SMB_ACL_PERMSET_T permset;
2437 struct dom_sid sid;
2438 posix_id unix_ug;
2439 enum ace_owner owner_type;
2440
2441 entry_id = SMB_ACL_NEXT_ENTRY;
2442
2443 /* Is this a MASK entry ? */
2444 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2445 continue;
2446
2447 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2448 continue;
2449
2450 /* Decide which SID to use based on the ACL type. */
2451 switch(tagtype) {
2452 case SMB_ACL_USER_OBJ:
2453 /* Get the SID from the owner. */
2454 sid_copy(&sid, powner);
2455 unix_ug.uid = psbuf->st_ex_uid;
2456 owner_type = UID_ACE;
2457 break;
2458 case SMB_ACL_USER:
2459 {
2460 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2461 if (puid == NULL) {
2462 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2463 continue;
2464 }
2465 uid_to_sid( &sid, *puid);
2466 unix_ug.uid = *puid;
2467 owner_type = UID_ACE;
2468 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2469 break;
2470 }
2471 case SMB_ACL_GROUP_OBJ:
2472 /* Get the SID from the owning group. */
2473 sid_copy(&sid, pgroup);
2474 unix_ug.gid = psbuf->st_ex_gid;
2475 owner_type = GID_ACE;
2476 break;
2477 case SMB_ACL_GROUP:
2478 {
2479 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2480 if (pgid == NULL) {
2481 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2482 continue;
2483 }
2484 gid_to_sid( &sid, *pgid);
2485 unix_ug.gid = *pgid;
2486 owner_type = GID_ACE;
2487 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2488 break;
2489 }
2490 case SMB_ACL_MASK:
2491 acl_mask = convert_permset_to_mode_t(conn, permset);
2492 continue; /* Don't count the mask as an entry. */
2493 case SMB_ACL_OTHER:
2494 /* Use the Everyone SID */
2495 sid = global_sid_World;
2496 unix_ug.world = -1;
2497 owner_type = WORLD_ACE;
2498 break;
2499 default:
2500 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2501 continue;
2502 }
2503
2504 /*
2505 * Add this entry to the list.
2506 */
2507
2508 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2509 goto fail;
2510
2511 ZERO_STRUCTP(ace);
2512 ace->type = tagtype;
2513 ace->perms = convert_permset_to_mode_t(conn, permset);
2514 ace->attr = ALLOW_ACE;
2515 ace->trustee = sid;
2516 ace->unix_ug = unix_ug;
2517 ace->owner_type = owner_type;
2518 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2519
2520 DLIST_ADD(l_head, ace);
2521 }
2522
2523 /*
2524 * This next call will ensure we have at least a user/group/world set.
2525 */
2526
2527 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2528 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2529 psbuf, False))
2530 goto fail;
2531
2532 /*
2533 * Now go through the list, masking the permissions with the
2534 * acl_mask. Ensure all DENY Entries are at the start of the list.
2535 */
2536
2537 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2538
2539 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2540 next_ace = ace->next;
2541
2542 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2543 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2544 ace->perms &= acl_mask;
2545
2546 if (ace->perms == 0) {
2547 DLIST_PROMOTE(l_head, ace);
2548 }
2549
2550 if( DEBUGLVL( 10 ) ) {
2551 print_canon_ace(ace, ace_count);
2552 }
2553 }
2554
2555 arrange_posix_perms(fname,&l_head );
2556
2557 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2558
2559 return l_head;
2560
2561 fail:
2562
2563 free_canon_ace_list(l_head);
2564 return NULL;
2565 }
2566
2567 /****************************************************************************
2568 Check if the current user group list contains a given group.
2569 ****************************************************************************/
2570
2571 bool current_user_in_group(connection_struct *conn, gid_t gid)
2572 {
2573 int i;
2574 const struct security_unix_token *utok = get_current_utok(conn);
2575
2576 for (i = 0; i < utok->ngroups; i++) {
2577 if (utok->groups[i] == gid) {
2578 return True;
2579 }
2580 }
2581
2582 return False;
2583 }
2584
2585 /****************************************************************************
2586 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2587 ****************************************************************************/
2588
2589 static bool acl_group_override(connection_struct *conn,
2590 const struct smb_filename *smb_fname)
2591 {
2592 if ((errno != EPERM) && (errno != EACCES)) {
2593 return false;
2594 }
2595
2596 /* file primary group == user primary or supplementary group */
2597 if (lp_acl_group_control(SNUM(conn)) &&
2598 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2599 return true;
2600 }
2601
2602 /* user has writeable permission */
2603 if (lp_dos_filemode(SNUM(conn)) &&
2604 can_write_to_file(conn, smb_fname)) {
2605 return true;
2606 }
2607
2608 return false;
2609 }
2610
2611 /****************************************************************************
2612 Attempt to apply an ACL to a file or directory.
2613 ****************************************************************************/
2614
2615 static bool set_canon_ace_list(files_struct *fsp,
2616 canon_ace *the_ace,
2617 bool default_ace,
2618 const SMB_STRUCT_STAT *psbuf,
2619 bool *pacl_set_support)
2620 {
2621 connection_struct *conn = fsp->conn;
2622 bool ret = False;
2623 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2624 canon_ace *p_ace;
2625 int i;
2626 SMB_ACL_ENTRY_T mask_entry;
2627 bool got_mask_entry = False;
2628 SMB_ACL_PERMSET_T mask_permset;
2629 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2630 bool needs_mask = False;
2631 mode_t mask_perms = 0;
2632
2633 /* Use the psbuf that was passed in. */
2634 if (psbuf != &fsp->fsp_name->st) {
2635 fsp->fsp_name->st = *psbuf;
2636 }
2637
2638 #if defined(POSIX_ACL_NEEDS_MASK)
2639 /* HP-UX always wants to have a mask (called "class" there). */
2640 needs_mask = True;
2641 #endif
2642
2643 if (the_acl == NULL) {
2644
2645 if (!no_acl_syscall_error(errno)) {
2646 /*
2647 * Only print this error message if we have some kind of ACL
2648 * support that's not working. Otherwise we would always get this.
2649 */
2650 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2651 default_ace ? "default" : "file", strerror(errno) ));
2652 }
2653 *pacl_set_support = False;
2654 goto fail;
2655 }
2656
2657 if( DEBUGLVL( 10 )) {
2658 dbgtext("set_canon_ace_list: setting ACL:\n");
2659 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2660 print_canon_ace( p_ace, i);
2661 }
2662 }
2663
2664 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2665 SMB_ACL_ENTRY_T the_entry;
2666 SMB_ACL_PERMSET_T the_permset;
2667
2668 /*
2669 * ACLs only "need" an ACL_MASK entry if there are any named user or
2670 * named group entries. But if there is an ACL_MASK entry, it applies
2671 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2672 * so that it doesn't deny (i.e., mask off) any permissions.
2673 */
2674
2675 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2676 needs_mask = True;
2677 mask_perms |= p_ace->perms;
2678 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2679 mask_perms |= p_ace->perms;
2680 }
2681
2682 /*
2683 * Get the entry for this ACE.
2684 */
2685
2686 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2687 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2688 i, strerror(errno) ));
2689 goto fail;
2690 }
2691
2692 if (p_ace->type == SMB_ACL_MASK) {
2693 mask_entry = the_entry;
2694 got_mask_entry = True;
2695 }
2696
2697 /*
2698 * Ok - we now know the ACL calls should be working, don't
2699 * allow fallback to chmod.
2700 */
2701
2702 *pacl_set_support = True;
2703
2704 /*
2705 * Initialise the entry from the canon_ace.
2706 */
2707
2708 /*
2709 * First tell the entry what type of ACE this is.
2710 */
2711
2712 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2713 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2714 i, strerror(errno) ));
2715 goto fail;
2716 }
2717
2718 /*
2719 * Only set the qualifier (user or group id) if the entry is a user
2720 * or group id ACE.
2721 */
2722
2723 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2724 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2725 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2726 i, strerror(errno) ));
2727 goto fail;
2728 }
2729 }
2730
2731 /*
2732 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2733 */
2734
2735 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2736 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2737 i, strerror(errno) ));
2738 goto fail;
2739 }
2740
2741 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2742 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2743 (unsigned int)p_ace->perms, i, strerror(errno) ));
2744 goto fail;
2745 }
2746
2747 /*
2748 * ..and apply them to the entry.
2749 */
2750
2751 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2752 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2753 i, strerror(errno) ));
2754 goto fail;
2755 }
2756
2757 if( DEBUGLVL( 10 ))
2758 print_canon_ace( p_ace, i);
2759
2760 }
2761
2762 if (needs_mask && !got_mask_entry) {
2763 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2764 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2765 goto fail;
2766 }
2767
2768 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2769 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2770 goto fail;
2771 }
2772
2773 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2774 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2775 goto fail;
2776 }
2777
2778 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2779 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2780 goto fail;
2781 }
2782
2783 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2784 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2785 goto fail;
2786 }
2787 }
2788
2789 /*
2790 * Finally apply it to the file or directory.
2791 */
2792
2793 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2794 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2795 the_acl_type, the_acl) == -1) {
2796 /*
2797 * Some systems allow all the above calls and only fail with no ACL support
2798 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2799 */
2800 if (no_acl_syscall_error(errno)) {
2801 *pacl_set_support = False;
2802 }
2803
2804 if (acl_group_override(conn, fsp->fsp_name)) {
2805 int sret;
2806
2807 DEBUG(5,("set_canon_ace_list: acl group "
2808 "control on and current user in file "
2809 "%s primary group.\n",
2810 fsp_str_dbg(fsp)));
2811
2812 become_root();
2813 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2814 fsp->fsp_name->base_name, the_acl_type,
2815 the_acl);
2816 unbecome_root();
2817 if (sret == 0) {
2818 ret = True;
2819 }
2820 }
2821
2822 if (ret == False) {
2823 DEBUG(2,("set_canon_ace_list: "
2824 "sys_acl_set_file type %s failed for "
2825 "file %s (%s).\n",
2826 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2827 "directory default" : "file",
2828 fsp_str_dbg(fsp), strerror(errno)));
2829 goto fail;
2830 }
2831 }
2832 } else {
2833 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2834 /*
2835 * Some systems allow all the above calls and only fail with no ACL support
2836 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2837 */
2838 if (no_acl_syscall_error(errno)) {
2839 *pacl_set_support = False;
2840 }
2841
2842 if (acl_group_override(conn, fsp->fsp_name)) {
2843 int sret;
2844
2845 DEBUG(5,("set_canon_ace_list: acl group "
2846 "control on and current user in file "
2847 "%s primary group.\n",
2848 fsp_str_dbg(fsp)));
2849
2850 become_root();
2851 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2852 unbecome_root();
2853 if (sret == 0) {
2854 ret = True;
2855 }
2856 }
2857
2858 if (ret == False) {
2859 DEBUG(2,("set_canon_ace_list: "
2860 "sys_acl_set_file failed for file %s "
2861 "(%s).\n",
2862 fsp_str_dbg(fsp), strerror(errno)));
2863 goto fail;
2864 }
2865 }
2866 }
2867
2868 ret = True;
2869
2870 fail:
2871
2872 if (the_acl != NULL) {
2873 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2874 }
2875
2876 return ret;
2877 }
2878
2879 /****************************************************************************
2880 Find a particular canon_ace entry.
2881 ****************************************************************************/
2882
2883 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2884 {
2885 while (list) {
2886 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2887 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2888 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2889 break;
2890 list = list->next;
2891 }
2892 return list;
2893 }
2894
2895 /****************************************************************************
2896
2897 ****************************************************************************/
2898
2899 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2900 {
2901 SMB_ACL_ENTRY_T entry;
2902
2903 if (!the_acl)
2904 return NULL;
2905 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2906 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2907 return NULL;
2908 }
2909 return the_acl;
2910 }
2911
2912 /****************************************************************************
2913 Convert a canon_ace to a generic 3 element permission - if possible.
2914 ****************************************************************************/
2915
2916 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2917
2918 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2919 {
2920 int snum = SNUM(fsp->conn);
2921 size_t ace_count = count_canon_ace_list(file_ace_list);
2922 canon_ace *ace_p;
2923 canon_ace *owner_ace = NULL;
2924 canon_ace *group_ace = NULL;
2925 canon_ace *other_ace = NULL;
2926 mode_t and_bits;
2927 mode_t or_bits;
2928
2929 if (ace_count != 3) {
2930 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2931 "entries for file %s to convert to posix perms.\n",
2932 fsp_str_dbg(fsp)));
2933 return False;
2934 }
2935
2936 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2937 if (ace_p->owner_type == UID_ACE)
2938 owner_ace = ace_p;
2939 else if (ace_p->owner_type == GID_ACE)
2940 group_ace = ace_p;
2941 else if (ace_p->owner_type == WORLD_ACE)
2942 other_ace = ace_p;
2943 }
2944
2945 if (!owner_ace || !group_ace || !other_ace) {
2946 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2947 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2948 return False;
2949 }
2950
2951 *posix_perms = (mode_t)0;
2952
2953 *posix_perms |= owner_ace->perms;
2954 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2955 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2956 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2957 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2958 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2959 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2960
2961 /* The owner must have at least read access. */
2962
2963 *posix_perms |= S_IRUSR;
2964 if (fsp->is_directory)
2965 *posix_perms |= (S_IWUSR|S_IXUSR);
2966
2967 /* If requested apply the masks. */
2968
2969 /* Get the initial bits to apply. */
2970
2971 if (fsp->is_directory) {
2972 and_bits = lp_dir_security_mask(snum);
2973 or_bits = lp_force_dir_security_mode(snum);
2974 } else {
2975 and_bits = lp_security_mask(snum);
2976 or_bits = lp_force_security_mode(snum);
2977 }
2978
2979 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2980
2981 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2982 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2983 (int)group_ace->perms, (int)other_ace->perms,
2984 (int)*posix_perms, fsp_str_dbg(fsp)));
2985
2986 return True;
2987 }
2988
2989 /****************************************************************************
2990 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2991 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2992 with CI|OI set so it is inherited and also applies to the directory.
2993 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2994 ****************************************************************************/
2995
2996 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
2997 {
2998 size_t i, j;
2999
3000 for (i = 0; i < num_aces; i++) {
3001 for (j = i+1; j < num_aces; j++) {
3002 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3003 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3004 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3005 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3006
3007 /* We know the lower number ACE's are file entries. */
3008 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3009 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3010 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3011 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3012 (i_inh == j_inh) &&
3013 (i_flags_ni == 0) &&
3014 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3015 SEC_ACE_FLAG_CONTAINER_INHERIT|
3016 SEC_ACE_FLAG_INHERIT_ONLY))) {
3017 /*
3018 * W2K wants to have access allowed zero access ACE's
3019 * at the end of the list. If the mask is zero, merge
3020 * the non-inherited ACE onto the inherited ACE.
3021 */
3022
3023 if (nt_ace_list[i].access_mask == 0) {
3024 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3025 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3026 if (num_aces - i - 1 > 0)
3027 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3028 sizeof(struct security_ace));
3029
3030 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3031 (unsigned int)i, (unsigned int)j ));
3032 } else {
3033 /*
3034 * These are identical except for the flags.
3035 * Merge the inherited ACE onto the non-inherited ACE.
3036 */
3037
3038 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3039 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3040 if (num_aces - j - 1 > 0)
3041 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3042 sizeof(struct security_ace));
3043
3044 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3045 (unsigned int)j, (unsigned int)i ));
3046 }
3047 num_aces--;
3048 break;
3049 }
3050 }
3051 }
3052
3053 return num_aces;
3054 }
3055
3056 /*
3057 * Add or Replace ACE entry.
3058 * In some cases we need to add a specific ACE for compatibility reasons.
3059 * When doing that we must make sure we are not actually creating a duplicate
3060 * entry. So we need to search whether an ACE entry already exist and eventually
3061 * replacce the access mask, or add a completely new entry if none was found.
3062 *
3063 * This function assumes the array has enough space to add a new entry without
3064 * any reallocation of memory.
3065 */
3066
3067 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3068 const struct dom_sid *sid, enum security_ace_type type,
3069 uint32_t mask, uint8_t flags)
3070 {
3071 int i;
3072
3073 /* first search for a duplicate */
3074 for (i = 0; i < *num_aces; i++) {
3075 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3076 (nt_ace_list[i].flags == flags)) break;
3077 }
3078
3079 if (i < *num_aces) { /* found */
3080 nt_ace_list[i].type = type;
3081 nt_ace_list[i].access_mask = mask;
3082 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3083 i, sid_string_dbg(sid), flags));
3084 return;
3085 }
3086
3087 /* not found, append it */
3088 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3089 }
3090
3091
3092 /****************************************************************************
3093 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3094 the space for the return elements and returns the size needed to return the
3095 security descriptor. This should be the only external function needed for
3096 the UNIX style get ACL.
3097 ****************************************************************************/
3098
3099 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3100 const char *name,
3101 const SMB_STRUCT_STAT *sbuf,
3102 struct pai_val *pal,
3103 SMB_ACL_T posix_acl,
3104 SMB_ACL_T def_acl,
3105 uint32_t security_info,
3106 struct security_descriptor **ppdesc)
3107 {
3108 struct dom_sid owner_sid;
3109 struct dom_sid group_sid;
3110 size_t sd_size = 0;
3111 struct security_acl *psa = NULL;
3112 size_t num_acls = 0;
3113 size_t num_def_acls = 0;
3114 size_t num_aces = 0;
3115 canon_ace *file_ace = NULL;
3116 canon_ace *dir_ace = NULL;
3117 struct security_ace *nt_ace_list = NULL;
3118 size_t num_profile_acls = 0;
3119 struct dom_sid orig_owner_sid;
3120 struct security_descriptor *psd = NULL;
3121 int i;
3122
3123 /*
3124 * Get the owner, group and world SIDs.
3125 */
3126
3127 create_file_sids(sbuf, &owner_sid, &group_sid);
3128
3129 if (lp_profile_acls(SNUM(conn))) {
3130 /* For WXP SP1 the owner must be administrators. */
3131 sid_copy(&orig_owner_sid, &owner_sid);
3132 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3133 sid_copy(&group_sid, &global_sid_Builtin_Users);
3134 num_profile_acls = 3;
3135 }
3136
3137 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3138
3139 /*
3140 * In the optimum case Creator Owner and Creator Group would be used for
3141 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3142 * would lead to usability problems under Windows: The Creator entries
3143 * are only available in browse lists of directories and not for files;
3144 * additionally the identity of the owning group couldn't be determined.
3145 * We therefore use those identities only for Default ACLs.
3146 */
3147
3148 /* Create the canon_ace lists. */
3149 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3150 &owner_sid, &group_sid, pal,
3151 SMB_ACL_TYPE_ACCESS);
3152
3153 /* We must have *some* ACLS. */
3154
3155 if (count_canon_ace_list(file_ace) == 0) {
3156 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3157 goto done;
3158 }
3159
3160 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3161 dir_ace = canonicalise_acl(conn, name, def_acl,
3162 sbuf,
3163 &global_sid_Creator_Owner,
3164 &global_sid_Creator_Group,
3165 pal, SMB_ACL_TYPE_DEFAULT);
3166 }
3167
3168 /*
3169 * Create the NT ACE list from the canonical ace lists.
3170 */
3171
3172 {
3173 canon_ace *ace;
3174 enum security_ace_type nt_acl_type;
3175
3176 if (nt4_compatible_acls() && dir_ace) {
3177 /*
3178 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3179 * but no non-INHERIT_ONLY entry for one SID. So we only
3180 * remove entries from the Access ACL if the
3181 * corresponding Default ACL entries have also been
3182 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3183 * are exceptions. We can do nothing
3184 * intelligent if the Default ACL contains entries that
3185 * are not also contained in the Access ACL, so this
3186 * case will still fail under NT 4.
3187 */
3188
3189 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3190 if (ace && !ace->perms) {
3191 DLIST_REMOVE(dir_ace, ace);
3192 SAFE_FREE(ace);
3193
3194 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3195 if (ace && !ace->perms) {
3196 DLIST_REMOVE(file_ace, ace);
3197 SAFE_FREE(ace);
3198 }
3199 }
3200
3201 /*
3202 * WinNT doesn't usually have Creator Group
3203 * in browse lists, so we send this entry to
3204 * WinNT even if it contains no relevant
3205 * permissions. Once we can add
3206 * Creator Group to browse lists we can
3207 * re-enable this.
3208 */
3209
3210 #if 0
3211 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3212 if (ace && !ace->perms) {
3213 DLIST_REMOVE(dir_ace, ace);
3214 SAFE_FREE(ace);
3215 }
3216 #endif
3217
3218 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3219 if (ace && !ace->perms) {
3220 DLIST_REMOVE(file_ace, ace);
3221 SAFE_FREE(ace);
3222 }
3223 }
3224
3225 num_acls = count_canon_ace_list(file_ace);
3226 num_def_acls = count_canon_ace_list(dir_ace);
3227
3228 /* Allocate the ace list. */
3229 if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3230 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3231 goto done;
3232 }
3233
3234 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3235
3236 /*
3237 * Create the NT ACE list from the canonical ace lists.
3238 */
3239
3240 for (ace = file_ace; ace != NULL; ace = ace->next) {
3241 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3242 &nt_acl_type,
3243 ace->perms,
3244 S_ISDIR(sbuf->st_ex_mode));
3245 init_sec_ace(&nt_ace_list[num_aces++],
3246 &ace->trustee,
3247 nt_acl_type,
3248 acc,
3249 ace->ace_flags);
3250 }
3251
3252 /* The User must have access to a profile share - even
3253 * if we can't map the SID. */
3254 if (lp_profile_acls(SNUM(conn))) {
3255 add_or_replace_ace(nt_ace_list, &num_aces,
3256 &global_sid_Builtin_Users,
3257 SEC_ACE_TYPE_ACCESS_ALLOWED,
3258 FILE_GENERIC_ALL, 0);
3259 }
3260
3261 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3262 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3263 &nt_acl_type,
3264 ace->perms,
3265 S_ISDIR(sbuf->st_ex_mode));
3266 init_sec_ace(&nt_ace_list[num_aces++],
3267 &ace->trustee,
3268 nt_acl_type,
3269 acc,
3270 ace->ace_flags |
3271 SEC_ACE_FLAG_OBJECT_INHERIT|
3272 SEC_ACE_FLAG_CONTAINER_INHERIT|
3273 SEC_ACE_FLAG_INHERIT_ONLY);
3274 }
3275
3276 /* The User must have access to a profile share - even
3277 * if we can't map the SID. */
3278 if (lp_profile_acls(SNUM(conn))) {
3279 add_or_replace_ace(nt_ace_list, &num_aces,
3280 &global_sid_Builtin_Users,
3281 SEC_ACE_TYPE_ACCESS_ALLOWED,
3282 FILE_GENERIC_ALL,
3283 SEC_ACE_FLAG_OBJECT_INHERIT |
3284 SEC_ACE_FLAG_CONTAINER_INHERIT |
3285 SEC_ACE_FLAG_INHERIT_ONLY);
3286 }
3287
3288 /*
3289 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3290 * Win2K needs this to get the inheritance correct when replacing ACLs
3291 * on a directory tree. Based on work by Jim @ IBM.
3292 */
3293
3294 num_aces = merge_default_aces(nt_ace_list, num_aces);
3295
3296 if (lp_profile_acls(SNUM(conn))) {
3297 for (i = 0; i < num_aces; i++) {
3298 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3299 add_or_replace_ace(nt_ace_list, &num_aces,
3300 &orig_owner_sid,
3301 nt_ace_list[i].type,
3302 nt_ace_list[i].access_mask,
3303 nt_ace_list[i].flags);
3304 break;
3305 }
3306 }
3307 }
3308 }
3309
3310 if (num_aces) {
3311 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3312 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3313 goto done;
3314 }
3315 }
3316 } /* security_info & SECINFO_DACL */
3317
3318 psd = make_standard_sec_desc( talloc_tos(),
3319 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3320 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3321 psa,
3322 &sd_size);
3323
3324 if(!psd) {
3325 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3326 sd_size = 0;
3327 goto done;
3328 }
3329
3330 /*
3331 * Windows 2000: The DACL_PROTECTED flag in the security
3332 * descriptor marks the ACL as non-inheriting, i.e., no
3333 * ACEs from higher level directories propagate to this
3334 * ACL. In the POSIX ACL model permissions are only
3335 * inherited at file create time, so ACLs never contain
3336 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3337 * flag doesn't seem to bother Windows NT.
3338 * Always set this if map acl inherit is turned off.
3339 */
3340 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3341 psd->type |= SEC_DESC_DACL_PROTECTED;
3342 } else {
3343 psd->type |= pal->sd_type;
3344 }
3345
3346 if (psd->dacl) {
3347 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3348 }
3349
3350 *ppdesc = psd;
3351
3352 done:
3353
3354 if (posix_acl) {
3355 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3356 }
3357 if (def_acl) {
3358 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3359 }
3360 free_canon_ace_list(file_ace);
3361 free_canon_ace_list(dir_ace);
3362 free_inherited_info(pal);
3363 SAFE_FREE(nt_ace_list);
3364
3365 return NT_STATUS_OK;
3366 }
3367
3368 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3369 struct security_descriptor **ppdesc)
3370 {
3371 SMB_STRUCT_STAT sbuf;
3372 SMB_ACL_T posix_acl = NULL;
3373 struct pai_val *pal;
3374
3375 *ppdesc = NULL;
3376
3377 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3378 fsp_str_dbg(fsp)));
3379
3380 /* can it happen that fsp_name == NULL ? */
3381 if (fsp->is_directory || fsp->fh->fd == -1) {
3382 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3383 security_info, ppdesc);
3384 }
3385
3386 /* Get the stat struct for the owner info. */
3387 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3388 return map_nt_error_from_unix(errno);
3389 }
3390
3391 /* Get the ACL from the fd. */
3392 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3393
3394 pal = fload_inherited_info(fsp);
3395
3396 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3397 &sbuf, pal, posix_acl, NULL,
3398 security_info, ppdesc);
3399 }
3400
3401 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3402 uint32_t security_info, struct security_descriptor **ppdesc)
3403 {
3404 SMB_ACL_T posix_acl = NULL;
3405 SMB_ACL_T def_acl = NULL;
3406 struct pai_val *pal;
3407 struct smb_filename smb_fname;
3408 int ret;
3409
3410 *ppdesc = NULL;
3411
3412 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3413
3414 ZERO_STRUCT(smb_fname);
3415 smb_fname.base_name = discard_const_p(char, name);
3416
3417 /* Get the stat struct for the owner info. */
3418 if (lp_posix_pathnames()) {
3419 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3420 } else {
3421 ret = SMB_VFS_STAT(conn, &smb_fname);
3422 }
3423
3424 if (ret == -1) {
3425 return map_nt_error_from_unix(errno);
3426 }
3427
3428 /* Get the ACL from the path. */
3429 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3430
3431 /* If it's a directory get the default POSIX ACL. */
3432 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3433 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3434 def_acl = free_empty_sys_acl(conn, def_acl);
3435 }
3436
3437 pal = load_inherited_info(conn, name);
3438
3439 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3440 posix_acl, def_acl, security_info,
3441 ppdesc);
3442 }
3443
3444 /****************************************************************************
3445 Try to chown a file. We will be able to chown it under the following conditions.
3446
3447 1) If we have root privileges, then it will just work.
3448 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3449 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3450 4) If we have write permission to the file and dos_filemodes is set
3451 then allow chown to the currently authenticated user.
3452 ****************************************************************************/
3453
3454 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3455 {
3456 NTSTATUS status;
3457
3458 if(!CAN_WRITE(fsp->conn)) {
3459 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3460 }
3461
3462 /* Case (1). */
3463 status = vfs_chown_fsp(fsp, uid, gid);
3464 if (NT_STATUS_IS_OK(status)) {
3465 return status;
3466 }
3467
3468 /* Case (2) / (3) */
3469 if (lp_enable_privileges()) {
3470 bool has_take_ownership_priv = security_token_has_privilege(
3471 get_current_nttok(fsp->conn),
3472 SEC_PRIV_TAKE_OWNERSHIP);
3473 bool has_restore_priv = security_token_has_privilege(
3474 get_current_nttok(fsp->conn),
3475 SEC_PRIV_RESTORE);
3476
3477 if (has_restore_priv) {
3478 ; /* Case (2) */
3479 } else if (has_take_ownership_priv) {
3480 /* Case (3) */
3481 if (uid == get_current_uid(fsp->conn)) {
3482 gid = (gid_t)-1;
3483 } else {
3484 has_take_ownership_priv = false;
3485 }
3486 }
3487
3488 if (has_take_ownership_priv || has_restore_priv) {
3489 become_root();
3490 status = vfs_chown_fsp(fsp, uid, gid);
3491 unbecome_root();
3492 return status;
3493 }
3494 }
3495
3496 /* Case (4). */
3497 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3498 return NT_STATUS_ACCESS_DENIED;
3499 }
3500
3501 /* only allow chown to the current user. This is more secure,
3502 and also copes with the case where the SID in a take ownership ACL is
3503 a local SID on the users workstation
3504 */
3505 if (uid != get_current_uid(fsp->conn)) {
3506 return NT_STATUS_ACCESS_DENIED;
3507 }
3508
3509 become_root();
3510 /* Keep the current file gid the same. */
3511 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3512 unbecome_root();
3513
3514 return status;
3515 }
3516
3517 #if 0
3518 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3519
3520 /****************************************************************************
3521 Take care of parent ACL inheritance.
3522 ****************************************************************************/
3523
3524 NTSTATUS append_parent_acl(files_struct *fsp,
3525 const struct security_descriptor *pcsd,
3526 struct security_descriptor **pp_new_sd)
3527 {
3528 struct smb_filename *smb_dname = NULL;
3529 struct security_descriptor *parent_sd = NULL;
3530 files_struct *parent_fsp = NULL;
3531 TALLOC_CTX *mem_ctx = talloc_tos();
3532 char *parent_name = NULL;
3533 struct security_ace *new_ace = NULL;
3534 unsigned int num_aces = pcsd->dacl->num_aces;
3535 NTSTATUS status;
3536 int info;
3537 unsigned int i, j;
3538 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3539 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3540
3541 if (psd == NULL) {
3542 return NT_STATUS_NO_MEMORY;
3543 }
3544
3545 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3546 NULL)) {
3547 return NT_STATUS_NO_MEMORY;
3548 }
3549
3550 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3551 &smb_dname);
3552 if (!NT_STATUS_IS_OK(status)) {
3553 goto fail;
3554 }
3555
3556 status = SMB_VFS_CREATE_FILE(
3557 fsp->conn, /* conn */
3558 NULL, /* req */
3559 0, /* root_dir_fid */
3560 smb_dname, /* fname */
3561 FILE_READ_ATTRIBUTES, /* access_mask */
3562 FILE_SHARE_NONE, /* share_access */
3563 FILE_OPEN, /* create_disposition*/
3564 FILE_DIRECTORY_FILE, /* create_options */
3565 0, /* file_attributes */
3566 INTERNAL_OPEN_ONLY, /* oplock_request */
3567 0, /* allocation_size */
3568 NULL, /* sd */
3569 NULL, /* ea_list */
3570 &parent_fsp, /* result */
3571 &info); /* pinfo */
3572
3573 if (!NT_STATUS_IS_OK(status)) {
3574 TALLOC_FREE(smb_dname);
3575 return status;
3576 }
3577
3578 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3579 SECINFO_DACL, &parent_sd );
3580
3581 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3582 TALLOC_FREE(smb_dname);
3583
3584 if (!NT_STATUS_IS_OK(status)) {
3585 return status;
3586 }
3587
3588 /*
3589 * Make room for potentially all the ACLs from
3590 * the parent. We used to add the ugw triple here,
3591 * as we knew we were dealing with POSIX ACLs.
3592 * We no longer need to do so as we can guarentee
3593 * that a default ACL from the parent directory will
3594 * be well formed for POSIX ACLs if it came from a
3595 * POSIX ACL source, and if we're not writing to a
3596 * POSIX ACL sink then we don't care if it's not well
3597 * formed. JRA.
3598 */
3599
3600 num_aces += parent_sd->dacl->num_aces;
3601
3602 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3603 num_aces)) == NULL) {
3604 return NT_STATUS_NO_MEMORY;
3605 }
3606
3607 /* Start by copying in all the given ACE entries. */
3608 for (i = 0; i < psd->dacl->num_aces; i++) {
3609 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3610 }
3611
3612 /*
3613 * Note that we're ignoring "inherit permissions" here
3614 * as that really only applies to newly created files. JRA.
3615 */
3616
3617 /* Finally append any inherited ACEs. */
3618 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3619 struct security_ace *se = &parent_sd->dacl->aces[j];
3620
3621 if (fsp->is_directory) {
3622 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3623 /* Doesn't apply to a directory - ignore. */
3624 DEBUG(10,("append_parent_acl: directory %s "
3625 "ignoring non container "
3626 "inherit flags %u on ACE with sid %s "
3627 "from parent %s\n",
3628 fsp_str_dbg(fsp),
3629 (unsigned int)se->flags,
3630 sid_string_dbg(&se->trustee),
3631 parent_name));
3632 continue;
3633 }
3634 } else {
3635 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3636 /* Doesn't apply to a file - ignore. */
3637 DEBUG(10,("append_parent_acl: file %s "
3638 "ignoring non object "
3639 "inherit flags %u on ACE with sid %s "
3640 "from parent %s\n",
3641 fsp_str_dbg(fsp),
3642 (unsigned int)se->flags,
3643 sid_string_dbg(&se->trustee),
3644 parent_name));
3645 continue;
3646 }
3647 }
3648
3649 if (is_dacl_protected) {
3650 /* If the DACL is protected it means we must
3651 * not overwrite an existing ACE entry with the
3652 * same SID. This is order N^2. Ouch :-(. JRA. */
3653 unsigned int k;
3654 for (k = 0; k < psd->dacl->num_aces; k++) {
3655 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3656 &se->trustee)) {
3657 break;
3658 }
3659 }
3660 if (k < psd->dacl->num_aces) {
3661 /* SID matched. Ignore. */
3662 DEBUG(10,("append_parent_acl: path %s "
3663 "ignoring ACE with protected sid %s "
3664 "from parent %s\n",
3665 fsp_str_dbg(fsp),
3666 sid_string_dbg(&se->trustee),
3667 parent_name));
3668 continue;
3669 }
3670 }
3671
3672 sec_ace_copy(&new_ace[i], se);
3673 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3674 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3675 }
3676 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3677
3678 if (fsp->is_directory) {
3679 /*
3680 * Strip off any inherit only. It's applied.
3681 */
3682 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3683 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3684 /* No further inheritance. */
3685 new_ace[i].flags &=
3686 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3687 SEC_ACE_FLAG_OBJECT_INHERIT);
3688 }
3689 } else {
3690 /*
3691 * Strip off any container or inherit
3692 * flags, they can't apply to objects.
3693 */
3694 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3695 SEC_ACE_FLAG_INHERIT_ONLY|
3696 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3697 }
3698 i++;
3699
3700 DEBUG(10,("append_parent_acl: path %s "
3701 "inheriting ACE with sid %s "
3702 "from parent %s\n",
3703 fsp_str_dbg(fsp),
3704 sid_string_dbg(&se->trustee),
3705 parent_name));
3706 }
3707
3708 psd->dacl->aces = new_ace;
3709 psd->dacl->num_aces = i;
3710 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3711 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3712
3713 *pp_new_sd = psd;
3714 return status;
3715 }
3716 #endif
3717
3718 /****************************************************************************
3719 Reply to set a security descriptor on an fsp. security_info_sent is the
3720 description of the following NT ACL.
3721 This should be the only external function needed for the UNIX style set ACL.
3722 We make a copy of psd_orig as internal functions modify the elements inside
3723 it, even though it's a const pointer.
3724 ****************************************************************************/
3725
3726 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3727 {
3728 connection_struct *conn = fsp->conn;
3729 uid_t user = (uid_t)-1;
3730 gid_t grp = (gid_t)-1;
3731 struct dom_sid file_owner_sid;
3732 struct dom_sid file_grp_sid;
3733 canon_ace *file_ace_list = NULL;
3734 canon_ace *dir_ace_list = NULL;
3735 bool acl_perms = False;
3736 mode_t orig_mode = (mode_t)0;
3737 NTSTATUS status;
3738 bool set_acl_as_root = false;
3739 bool acl_set_support = false;
3740 bool ret = false;
3741 struct security_descriptor *psd = NULL;
3742
3743 DEBUG(10,("set_nt_acl: called for file %s\n",
3744 fsp_str_dbg(fsp)));
3745
3746 if (!CAN_WRITE(conn)) {
3747 DEBUG(10,("set acl rejected on read-only share\n"));
3748 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3749 }
3750
3751 if (!psd_orig) {
3752 return NT_STATUS_INVALID_PARAMETER;
3753 }
3754
3755 psd = dup_sec_desc(talloc_tos(), psd_orig);
3756 if (!psd) {
3757 return NT_STATUS_NO_MEMORY;
3758 }
3759
3760 /*
3761 * Get the current state of the file.
3762 */
3763
3764 status = vfs_stat_fsp(fsp);
3765 if (!NT_STATUS_IS_OK(status)) {
3766 return status;
3767 }
3768
3769 /* Save the original element we check against. */
3770 orig_mode = fsp->fsp_name->st.st_ex_mode;
3771
3772 /*
3773 * Unpack the user/group/world id's.
3774 */
3775
3776 /* POSIX can't cope with missing owner/group. */
3777 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3778 security_info_sent &= ~SECINFO_OWNER;
3779 }
3780 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3781 security_info_sent &= ~SECINFO_GROUP;
3782 }
3783
3784 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3785 if (!NT_STATUS_IS_OK(status)) {
3786 return status;
3787 }
3788
3789 /*
3790 * Do we need to chown ? If so this must be done first as the incoming
3791 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3792 * Noticed by Simo.
3793 */
3794
3795 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3796 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3797
3798 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3799 fsp_str_dbg(fsp), (unsigned int)user,
3800 (unsigned int)grp));
3801
3802 status = try_chown(fsp, user, grp);
3803 if(!NT_STATUS_IS_OK(status)) {
3804 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3805 "= %s.\n", fsp_str_dbg(fsp),
3806 (unsigned int)user,
3807 (unsigned int)grp,
3808 nt_errstr(status)));
3809 return status;
3810 }
3811
3812 /*
3813 * Recheck the current state of the file, which may have changed.
3814 * (suid/sgid bits, for instance)
3815 */
3816
3817 status = vfs_stat_fsp(fsp);
3818 if (!NT_STATUS_IS_OK(status)) {
3819 return status;
3820 }
3821
3822 /* Save the original element we check against. */
3823 orig_mode = fsp->fsp_name->st.st_ex_mode;
3824
3825 /* If we successfully chowned, we know we must
3826 * be able to set the acl, so do it as root.
3827 */
3828 set_acl_as_root = true;
3829 }
3830
3831 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3832
3833 if((security_info_sent & SECINFO_DACL) &&
3834 (psd->type & SEC_DESC_DACL_PRESENT) &&
3835 (psd->dacl == NULL)) {
3836 struct security_ace ace[3];
3837
3838 /* We can't have NULL DACL in POSIX.
3839 Use owner/group/Everyone -> full access. */
3840
3841 init_sec_ace(&ace[0],
3842 &file_owner_sid,
3843 SEC_ACE_TYPE_ACCESS_ALLOWED,
3844 GENERIC_ALL_ACCESS,
3845 0);
3846 init_sec_ace(&ace[1],
3847 &file_grp_sid,
3848 SEC_ACE_TYPE_ACCESS_ALLOWED,
3849 GENERIC_ALL_ACCESS,
3850 0);
3851 init_sec_ace(&ace[2],
3852 &global_sid_World,
3853 SEC_ACE_TYPE_ACCESS_ALLOWED,
3854 GENERIC_ALL_ACCESS,
3855 0);
3856 psd->dacl = make_sec_acl(talloc_tos(),
3857 NT4_ACL_REVISION,
3858 3,
3859 ace);
3860 if (psd->dacl == NULL) {
3861 return NT_STATUS_NO_MEMORY;
3862 }
3863 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3864 }
3865
3866 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3867 &file_grp_sid, &file_ace_list,
3868 &dir_ace_list, security_info_sent, psd);
3869
3870 /* Ignore W2K traverse DACL set. */
3871 if (!file_ace_list && !dir_ace_list) {
3872 return NT_STATUS_OK;
3873 }
3874
3875 if (!acl_perms) {
3876 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3877 free_canon_ace_list(file_ace_list);
3878 free_canon_ace_list(dir_ace_list);
3879 return NT_STATUS_ACCESS_DENIED;
3880 }
3881
3882 /*
3883 * Only change security if we got a DACL.
3884 */
3885
3886 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3887 free_canon_ace_list(file_ace_list);
3888 free_canon_ace_list(dir_ace_list);
3889 return NT_STATUS_OK;
3890 }
3891
3892 /*
3893 * Try using the POSIX ACL set first. Fall back to chmod if
3894 * we have no ACL support on this filesystem.
3895 */
3896
3897 if (acl_perms && file_ace_list) {
3898 if (set_acl_as_root) {
3899 become_root();
3900 }
3901 ret = set_canon_ace_list(fsp, file_ace_list, false,
3902 &fsp->fsp_name->st, &acl_set_support);
3903 if (set_acl_as_root) {
3904 unbecome_root();
3905 }
3906 if (acl_set_support && ret == false) {
3907 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3908 "%s (%s).\n", fsp_str_dbg(fsp),
3909 strerror(errno)));
3910 free_canon_ace_list(file_ace_list);
3911 free_canon_ace_list(dir_ace_list);
3912 return map_nt_error_from_unix(errno);
3913 }
3914 }
3915
3916 if (acl_perms && acl_set_support && fsp->is_directory) {
3917 if (dir_ace_list) {
3918 if (set_acl_as_root) {
3919 become_root();
3920 }
3921 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3922 &fsp->fsp_name->st,
3923 &acl_set_support);
3924 if (set_acl_as_root) {
3925 unbecome_root();
3926 }
3927 if (ret == false) {
3928 DEBUG(3,("set_nt_acl: failed to set default "
3929 "acl on directory %s (%s).\n",
3930 fsp_str_dbg(fsp), strerror(errno)));
3931 free_canon_ace_list(file_ace_list);
3932 free_canon_ace_list(dir_ace_list);
3933 return map_nt_error_from_unix(errno);
3934 }
3935 } else {
3936 int sret = -1;
3937
3938 /*
3939 * No default ACL - delete one if it exists.
3940 */
3941
3942 if (set_acl_as_root) {
3943 become_root();
3944 }
3945 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3946 fsp->fsp_name->base_name);
3947 if (set_acl_as_root) {
3948 unbecome_root();
3949 }
3950 if (sret == -1) {
3951 if (acl_group_override(conn, fsp->fsp_name)) {
3952 DEBUG(5,("set_nt_acl: acl group "
3953 "control on and current user "
3954 "in file %s primary group. "
3955 "Override delete_def_acl\n",
3956 fsp_str_dbg(fsp)));
3957
3958 become_root();
3959 sret =
3960 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3961 conn,
3962 fsp->fsp_name->base_name);
3963 unbecome_root();
3964 }
3965
3966 if (sret == -1) {
3967 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3968 free_canon_ace_list(file_ace_list);
3969 free_canon_ace_list(dir_ace_list);
3970 return map_nt_error_from_unix(errno);
3971 }
3972 }
3973 }
3974 }
3975
3976 if (acl_set_support) {
3977 if (set_acl_as_root) {
3978 become_root();
3979 }
3980 store_inheritance_attributes(fsp,
3981 file_ace_list,
3982 dir_ace_list,
3983 psd->type);
3984 if (set_acl_as_root) {
3985 unbecome_root();
3986 }
3987 }
3988
3989 /*
3990 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3991 */
3992
3993 if(!acl_set_support && acl_perms) {
3994 mode_t posix_perms;
3995
3996 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3997 free_canon_ace_list(file_ace_list);
3998 free_canon_ace_list(dir_ace_list);
3999 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4000 "posix permissions for file %s.\n",
4001 fsp_str_dbg(fsp)));
4002 return NT_STATUS_ACCESS_DENIED;
4003 }
4004
4005 if (orig_mode != posix_perms) {
4006 int sret = -1;
4007
4008 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4009 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4010
4011 if (set_acl_as_root) {
4012 become_root();
4013 }
4014 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4015 posix_perms);
4016 if (set_acl_as_root) {
4017 unbecome_root();
4018 }
4019 if(sret == -1) {
4020 if (acl_group_override(conn, fsp->fsp_name)) {
4021 DEBUG(5,("set_nt_acl: acl group "
4022 "control on and current user "
4023 "in file %s primary group. "
4024 "Override chmod\n",
4025 fsp_str_dbg(fsp)));
4026
4027 become_root();
4028 sret = SMB_VFS_CHMOD(conn,
4029 fsp->fsp_name->base_name,
4030 posix_perms);
4031 unbecome_root();
4032 }
4033
4034 if (sret == -1) {
4035 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4036 "failed. Error = %s.\n",
4037 fsp_str_dbg(fsp),
4038 (unsigned int)posix_perms,
4039 strerror(errno)));
4040 free_canon_ace_list(file_ace_list);
4041 free_canon_ace_list(dir_ace_list);
4042 return map_nt_error_from_unix(errno);
4043 }
4044 }
4045 }
4046 }
4047
4048 free_canon_ace_list(file_ace_list);
4049 free_canon_ace_list(dir_ace_list);
4050
4051 /* Ensure the stat struct in the fsp is correct. */
4052 status = vfs_stat_fsp(fsp);
4053
4054 return NT_STATUS_OK;
4055 }
4056
4057 /****************************************************************************
4058 Get the actual group bits stored on a file with an ACL. Has no effect if
4059 the file has no ACL. Needed in dosmode code where the stat() will return
4060 the mask bits, not the real group bits, for a file with an ACL.
4061 ****************************************************************************/
4062
4063 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4064 {
4065 int entry_id = SMB_ACL_FIRST_ENTRY;
4066 SMB_ACL_ENTRY_T entry;
4067 SMB_ACL_T posix_acl;
4068 int result = -1;
4069
4070 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4071 if (posix_acl == (SMB_ACL_T)NULL)
4072 return -1;
4073
4074 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4075 SMB_ACL_TAG_T tagtype;
4076 SMB_ACL_PERMSET_T permset;
4077
4078 entry_id = SMB_ACL_NEXT_ENTRY;
4079
4080 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4081 break;
4082
4083 if (tagtype == SMB_ACL_GROUP_OBJ) {
4084 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4085 break;
4086 } else {
4087 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4088 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4089 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4090 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4091 result = 0;
4092 break;
4093 }
4094 }
4095 }
4096 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4097 return result;
4098 }
4099
4100 /****************************************************************************
4101 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4102 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4103 ****************************************************************************/
4104
4105 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4106 {
4107 int entry_id = SMB_ACL_FIRST_ENTRY;
4108 SMB_ACL_ENTRY_T entry;
4109 int num_entries = 0;
4110
4111 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4112 SMB_ACL_TAG_T tagtype;
4113 SMB_ACL_PERMSET_T permset;
4114 mode_t perms;
4115
4116 entry_id = SMB_ACL_NEXT_ENTRY;
4117
4118 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4119 return -1;
4120
4121 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4122 return -1;
4123
4124 num_entries++;
4125
4126 switch(tagtype) {
4127 case SMB_ACL_USER_OBJ:
4128 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4129 break;
4130 case SMB_ACL_GROUP_OBJ:
4131 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4132 break;
4133 case SMB_ACL_MASK:
4134 /*
4135 * FIXME: The ACL_MASK entry permissions should really be set to
4136 * the union of the permissions of all ACL_USER,
4137 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4138 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4139 */
4140 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4141 break;
4142 case SMB_ACL_OTHER:
4143 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4144 break;
4145 default:
4146 continue;
4147 }
4148
4149 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4150 return -1;
4151
4152 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4153 return -1;
4154 }
4155
4156 /*
4157 * If this is a simple 3 element ACL or no elements then it's a standard
4158 * UNIX permission set. Just use chmod...
4159 */
4160
4161 if ((num_entries == 3) || (num_entries == 0))
4162 return -1;
4163
4164 return 0;
4165 }
4166
4167 /****************************************************************************
4168 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4169 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4170 resulting ACL on TO. Note that name is in UNIX character set.
4171 ****************************************************************************/
4172
4173 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4174 {
4175 SMB_ACL_T posix_acl = NULL;
4176 int ret = -1;
4177
4178 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4179 return -1;
4180
4181 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4182 goto done;
4183
4184 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4185
4186 done:
4187
4188 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4189 return ret;
4190 }
4191
4192 /****************************************************************************
4193 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4194 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4195 Note that name is in UNIX character set.
4196 ****************************************************************************/
4197
4198 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4199 {
4200 return copy_access_posix_acl(conn, name, name, mode);
4201 }
4202
4203 /****************************************************************************
4204 Check for an existing default POSIX ACL on a directory.
4205 ****************************************************************************/
4206
4207 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4208 {
4209 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4210 bool has_acl = False;
4211 SMB_ACL_ENTRY_T entry;
4212
4213 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4214 has_acl = True;
4215 }
4216
4217 if (def_acl) {
4218 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4219 }
4220 return has_acl;
4221 }
4222
4223 /****************************************************************************
4224 If the parent directory has no default ACL but it does have an Access ACL,
4225 inherit this Access ACL to file name.
4226 ****************************************************************************/
4227
4228 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4229 const char *name, mode_t mode)
4230 {
4231 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4232 return 0;
4233
4234 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4235 }
4236
4237 /****************************************************************************
4238 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4239 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4240 ****************************************************************************/
4241
4242 int fchmod_acl(files_struct *fsp, mode_t mode)
4243 {
4244 connection_struct *conn = fsp->conn;
4245 SMB_ACL_T posix_acl = NULL;
4246 int ret = -1;
4247
4248 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4249 return -1;
4250
4251 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4252 goto done;
4253
4254 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4255
4256 done:
4257
4258 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4259 return ret;
4260 }
4261
4262 /****************************************************************************
4263 Map from wire type to permset.
4264 ****************************************************************************/
4265
4266 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4267 {
4268 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4269 return False;
4270 }
4271
4272 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4273 return False;
4274 }
4275
4276 if (wire_perm & SMB_POSIX_ACL_READ) {
4277 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4278 return False;
4279 }
4280 }
4281 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4282 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4283 return False;
4284 }
4285 }
4286 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4287 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4288 return False;
4289 }
4290 }
4291 return True;
4292 }
4293
4294 /****************************************************************************
4295 Map from wire type to tagtype.
4296 ****************************************************************************/
4297
4298 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4299 {
4300 switch (wire_tt) {
4301 case SMB_POSIX_ACL_USER_OBJ:
4302 *p_tt = SMB_ACL_USER_OBJ;
4303 break;
4304 case SMB_POSIX_ACL_USER:
4305 *p_tt = SMB_ACL_USER;
4306 break;
4307 case SMB_POSIX_ACL_GROUP_OBJ:
4308 *p_tt = SMB_ACL_GROUP_OBJ;
4309 break;
4310 case SMB_POSIX_ACL_GROUP:
4311 *p_tt = SMB_ACL_GROUP;
4312 break;
4313 case SMB_POSIX_ACL_MASK:
4314 *p_tt = SMB_ACL_MASK;
4315 break;
4316 case SMB_POSIX_ACL_OTHER:
4317 *p_tt = SMB_ACL_OTHER;
4318 break;
4319 default:
4320 return False;
4321 }
4322 return True;
4323 }
4324
4325 /****************************************************************************
4326 Create a new POSIX acl from wire permissions.
4327 FIXME ! How does the share mask/mode fit into this.... ?
4328 ****************************************************************************/
4329
4330 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4331 {
4332 unsigned int i;
4333 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4334
4335 if (the_acl == NULL) {
4336 return NULL;
4337 }
4338
4339 for (i = 0; i < num_acls; i++) {
4340 SMB_ACL_ENTRY_T the_entry;
4341 SMB_ACL_PERMSET_T the_permset;
4342 SMB_ACL_TAG_T tag_type;
4343
4344 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4345 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4346 i, strerror(errno) ));
4347 goto fail;
4348 }
4349
4350 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4351 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4352 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4353 goto fail;
4354 }
4355
4356 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4357 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4358 i, strerror(errno) ));
4359 goto fail;
4360 }
4361
4362 /* Get the permset pointer from the new ACL entry. */
4363 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4364 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4365 i, strerror(errno) ));
4366 goto fail;
4367 }
4368
4369 /* Map from wire to permissions. */
4370 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4371 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4372 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4373 goto fail;
4374 }
4375
4376 /* Now apply to the new ACL entry. */
4377 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4378 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4379 i, strerror(errno) ));
4380 goto fail;
4381 }
4382
4383 if (tag_type == SMB_ACL_USER) {
4384 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4385 uid_t uid = (uid_t)uidval;
4386 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4387 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4388 (unsigned int)uid, i, strerror(errno) ));
4389 goto fail;
4390 }
4391 }
4392
4393 if (tag_type == SMB_ACL_GROUP) {
4394 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4395 gid_t gid = (uid_t)gidval;
4396 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4397 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4398 (unsigned int)gid, i, strerror(errno) ));
4399 goto fail;
4400 }
4401 }
4402 }
4403
4404 return the_acl;
4405
4406 fail:
4407
4408 if (the_acl != NULL) {
4409 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4410 }
4411 return NULL;
4412 }
4413
4414 /****************************************************************************
4415 Calls from UNIX extensions - Default POSIX ACL set.
4416 If num_def_acls == 0 and not a directory just return. If it is a directory
4417 and num_def_acls == 0 then remove the default acl. Else set the default acl
4418 on the directory.
4419 ****************************************************************************/
4420
4421 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4422 uint16 num_def_acls, const char *pdata)
4423 {
4424 SMB_ACL_T def_acl = NULL;
4425
4426 if (!S_ISDIR(psbuf->st_ex_mode)) {
4427 if (num_def_acls) {
4428 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4429 errno = EISDIR;
4430 return False;
4431 } else {
4432 return True;
4433 }
4434 }
4435
4436 if (!num_def_acls) {
4437 /* Remove the default ACL. */
4438 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4439 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4440 fname, strerror(errno) ));
4441 return False;
4442 }
4443 return True;
4444 }
4445
4446 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4447 return False;
4448 }
4449
4450 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4451 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4452 fname, strerror(errno) ));
4453 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4454 return False;
4455 }
4456
4457 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4458 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4459 return True;
4460 }
4461
4462 /****************************************************************************
4463 Remove an ACL from a file. As we don't have acl_delete_entry() available
4464 we must read the current acl and copy all entries except MASK, USER and GROUP
4465 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4466 removed.
4467 FIXME ! How does the share mask/mode fit into this.... ?
4468 ****************************************************************************/
4469
4470 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4471 {
4472 SMB_ACL_T file_acl = NULL;
4473 int entry_id = SMB_ACL_FIRST_ENTRY;
4474 SMB_ACL_ENTRY_T entry;
4475 bool ret = False;
4476 /* Create a new ACL with only 3 entries, u/g/w. */
4477 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4478 SMB_ACL_ENTRY_T user_ent = NULL;
4479 SMB_ACL_ENTRY_T group_ent = NULL;
4480 SMB_ACL_ENTRY_T other_ent = NULL;
4481
4482 if (new_file_acl == NULL) {
4483 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4484 return False;
4485 }
4486
4487 /* Now create the u/g/w entries. */
4488 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4489 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4490 fname, strerror(errno) ));
4491 goto done;
4492 }
4493 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4494 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4495 fname, strerror(errno) ));
4496 goto done;
4497 }
4498
4499 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4500 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4501 fname, strerror(errno) ));
4502 goto done;
4503 }
4504 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4505 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4506 fname, strerror(errno) ));
4507 goto done;
4508 }
4509
4510 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4511 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4512 fname, strerror(errno) ));
4513 goto done;
4514 }
4515 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4516 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4517 fname, strerror(errno) ));
4518 goto done;
4519 }
4520
4521 /* Get the current file ACL. */
4522 if (fsp && fsp->fh->fd != -1) {
4523 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4524 } else {
4525 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4526 }
4527
4528 if (file_acl == NULL) {
4529 /* This is only returned if an error occurred. Even for a file with
4530 no acl a u/g/w acl should be returned. */
4531 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4532 fname, strerror(errno) ));
4533 goto done;
4534 }
4535
4536 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4537 SMB_ACL_TAG_T tagtype;
4538 SMB_ACL_PERMSET_T permset;
4539
4540 entry_id = SMB_ACL_NEXT_ENTRY;
4541
4542 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4543 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4544 fname, strerror(errno) ));
4545 goto done;
4546 }
4547
4548 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4549 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4550 fname, strerror(errno) ));
4551 goto done;
4552 }
4553
4554 if (tagtype == SMB_ACL_USER_OBJ) {
4555 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4556 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4557 fname, strerror(errno) ));
4558 }
4559 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4560 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4561 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4562 fname, strerror(errno) ));
4563 }
4564 } else if (tagtype == SMB_ACL_OTHER) {
4565 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4566 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4567 fname, strerror(errno) ));
4568 }
4569 }
4570 }
4571
4572 /* Set the new empty file ACL. */
4573 if (fsp && fsp->fh->fd != -1) {
4574 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4575 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4576 fname, strerror(errno) ));
4577 goto done;
4578 }
4579 } else {
4580 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4581 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4582 fname, strerror(errno) ));
4583 goto done;
4584 }
4585 }
4586
4587 ret = True;
4588
4589 done:
4590
4591 if (file_acl) {
4592 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4593 }
4594 if (new_file_acl) {
4595 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4596 }
4597 return ret;
4598 }
4599
4600 /****************************************************************************
4601 Calls from UNIX extensions - POSIX ACL set.
4602 If num_def_acls == 0 then read/modify/write acl after removing all entries
4603 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4604 ****************************************************************************/
4605
4606 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4607 {
4608 SMB_ACL_T file_acl = NULL;
4609
4610 if (!num_acls) {
4611 /* Remove the ACL from the file. */
4612 return remove_posix_acl(conn, fsp, fname);
4613 }
4614
4615 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4616 return False;
4617 }
4618
4619 if (fsp && fsp->fh->fd != -1) {
4620 /* The preferred way - use an open fd. */
4621 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4622 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4623 fname, strerror(errno) ));
4624 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4625 return False;
4626 }
4627 } else {
4628 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4629 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4630 fname, strerror(errno) ));
4631 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4632 return False;
4633 }
4634 }
4635
4636 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4637 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4638 return True;
4639 }
4640
4641 /********************************************************************
4642 Pull the NT ACL from a file on disk or the OpenEventlog() access
4643 check. Caller is responsible for freeing the returned security
4644 descriptor via TALLOC_FREE(). This is designed for dealing with
4645 user space access checks in smbd outside of the VFS. For example,
4646 checking access rights in OpenEventlog().
4647
4648 Assume we are dealing with files (for now)
4649 ********************************************************************/
4650
4651 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4652 {
4653 struct security_descriptor *psd, *ret_sd;
4654 connection_struct *conn;
4655 files_struct finfo;
4656 struct fd_handle fh;
4657 NTSTATUS status;
4658
4659 conn = talloc_zero(ctx, connection_struct);
4660 if (conn == NULL) {
4661 DEBUG(0, ("talloc failed\n"));
4662 return NULL;
4663 }
4664
4665 if (!(conn->params = talloc(conn, struct share_params))) {
4666 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4667 TALLOC_FREE(conn);
4668 return NULL;
4669 }
4670
4671 conn->params->service = -1;
4672
4673 set_conn_connectpath(conn, "/");
4674
4675 if (!smbd_vfs_init(conn)) {
4676 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4677 conn_free(conn);
4678 return NULL;
4679 }
4680
4681 ZERO_STRUCT( finfo );
4682 ZERO_STRUCT( fh );
4683
4684 finfo.fnum = -1;
4685 finfo.conn = conn;
4686 finfo.fh = &fh;
4687 finfo.fh->fd = -1;
4688
4689 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4690 &finfo.fsp_name);
4691 if (!NT_STATUS_IS_OK(status)) {
4692 conn_free(conn);
4693 return NULL;
4694 }
4695
4696 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4697 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4698 TALLOC_FREE(finfo.fsp_name);
4699 conn_free(conn);
4700 return NULL;
4701 }
4702
4703 ret_sd = dup_sec_desc( ctx, psd );
4704
4705 TALLOC_FREE(finfo.fsp_name);
4706 conn_free(conn);
4707
4708 return ret_sd;
4709 }
4710
4711 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4712
4713 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4714 const char *name,
4715 SMB_STRUCT_STAT *psbuf,
4716 struct security_descriptor **ppdesc)
4717 {
4718 struct dom_sid owner_sid, group_sid;
4719 size_t size = 0;
4720 struct security_ace aces[4];
4721 uint32_t access_mask = 0;
4722 mode_t mode = psbuf->st_ex_mode;
4723 struct security_acl *new_dacl = NULL;
4724 int idx = 0;
4725
4726 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4727 name, (int)mode ));
4728
4729 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4730 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4731
4732 /*
4733 We provide up to 4 ACEs
4734 - Owner
4735 - Group
4736 - Everyone
4737 - NT System
4738 */
4739
4740 if (mode & S_IRUSR) {
4741 if (mode & S_IWUSR) {
4742 access_mask |= SEC_RIGHTS_FILE_ALL;
4743 } else {
4744 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4745 }
4746 }
4747 if (mode & S_IWUSR) {
4748 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4749 }
4750
4751 init_sec_ace(&aces[idx],
4752 &owner_sid,
4753 SEC_ACE_TYPE_ACCESS_ALLOWED,
4754 access_mask,
4755 0);
4756 idx++;
4757
4758 access_mask = 0;
4759 if (mode & S_IRGRP) {
4760 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4761 }
4762 if (mode & S_IWGRP) {
4763 /* note that delete is not granted - this matches posix behaviour */
4764 access_mask |= SEC_RIGHTS_FILE_WRITE;
4765 }
4766 if (access_mask) {
4767 init_sec_ace(&aces[idx],
4768 &group_sid,
4769 SEC_ACE_TYPE_ACCESS_ALLOWED,
4770 access_mask,
4771 0);
4772 idx++;
4773 }
4774
4775 access_mask = 0;
4776 if (mode & S_IROTH) {
4777 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4778 }
4779 if (mode & S_IWOTH) {
4780 access_mask |= SEC_RIGHTS_FILE_WRITE;
4781 }
4782 if (access_mask) {
4783 init_sec_ace(&aces[idx],
4784 &global_sid_World,
4785 SEC_ACE_TYPE_ACCESS_ALLOWED,
4786 access_mask,
4787 0);
4788 idx++;
4789 }
4790
4791 init_sec_ace(&aces[idx],
4792 &global_sid_System,
4793 SEC_ACE_TYPE_ACCESS_ALLOWED,
4794 SEC_RIGHTS_FILE_ALL,
4795 0);
4796 idx++;
4797
4798 new_dacl = make_sec_acl(ctx,
4799 NT4_ACL_REVISION,
4800 idx,
4801 aces);
4802
4803 if (!new_dacl) {
4804 return NT_STATUS_NO_MEMORY;
4805 }
4806
4807 *ppdesc = make_sec_desc(ctx,
4808 SECURITY_DESCRIPTOR_REVISION_1,
4809 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4810 &owner_sid,
4811 &group_sid,
4812 NULL,
4813 new_dacl,
4814 &size);
4815 if (!*ppdesc) {
4816 return NT_STATUS_NO_MEMORY;
4817 }
4818 return NT_STATUS_OK;
4819 }
Working branch of Samba for id10ts