?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Fix mistaken assignment of gid to uid field.
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobecacecc759903e9151bfe19c2f18fc45d934e39d
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "system/filesys.h"
25 #include "../libcli/security/security.h"
26 #include "trans2.h"
27 #include "passdb/lookup_sid.h"
28 #include "auth.h"
29
30 extern const struct generic_mapping file_generic_mapping;
31
32 #undef DBGC_CLASS
33 #define DBGC_CLASS DBGC_ACLS
34
35 /****************************************************************************
36 Data structures representing the internal ACE format.
37 ****************************************************************************/
38
39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
41
42 typedef union posix_id {
43 uid_t uid;
44 gid_t gid;
45 int world;
46 } posix_id;
47
48 typedef struct canon_ace {
49 struct canon_ace *next, *prev;
50 SMB_ACL_TAG_T type;
51 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
52 struct dom_sid trustee;
53 enum ace_owner owner_type;
54 enum ace_attribute attr;
55 posix_id unix_ug;
56 uint8_t ace_flags; /* From windows ACE entry. */
57 } canon_ace;
58
59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
60
61 /*
62 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
63 * attribute on disk - version 1.
64 * All values are little endian.
65 *
66 * | 1 | 1 | 2 | 2 | ....
67 * +------+------+-------------+---------------------+-------------+--------------------+
68 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
69 * +------+------+-------------+---------------------+-------------+--------------------+
70 *
71 * Entry format is :
72 *
73 * | 1 | 4 |
74 * +------+-------------------+
75 * | value| uid/gid or world |
76 * | type | value |
77 * +------+-------------------+
78 *
79 * Version 2 format. Stores extra Windows metadata about an ACL.
80 *
81 * | 1 | 2 | 2 | 2 | ....
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
84 * | 2 | type | | | | |
85 * +------+----------+-------------+---------------------+-------------+--------------------+
86 *
87 * Entry format is :
88 *
89 * | 1 | 1 | 4 |
90 * +------+------+-------------------+
91 * | ace | value| uid/gid or world |
92 * | flag | type | value |
93 * +------+-------------------+------+
94 *
95 */
96
97 #define PAI_VERSION_OFFSET 0
98
99 #define PAI_V1_FLAG_OFFSET 1
100 #define PAI_V1_NUM_ENTRIES_OFFSET 2
101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
102 #define PAI_V1_ENTRIES_BASE 6
103 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
104 #define PAI_V1_ENTRY_LENGTH 5
105
106 #define PAI_V1_VERSION 1
107
108 #define PAI_V2_TYPE_OFFSET 1
109 #define PAI_V2_NUM_ENTRIES_OFFSET 3
110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
111 #define PAI_V2_ENTRIES_BASE 7
112 #define PAI_V2_ENTRY_LENGTH 6
113
114 #define PAI_V2_VERSION 2
115
116 /*
117 * In memory format of user.SAMBA_PAI attribute.
118 */
119
120 struct pai_entry {
121 struct pai_entry *next, *prev;
122 uint8_t ace_flags;
123 enum ace_owner owner_type;
124 posix_id unix_ug;
125 };
126
127 struct pai_val {
128 uint16_t sd_type;
129 unsigned int num_entries;
130 struct pai_entry *entry_list;
131 unsigned int num_def_entries;
132 struct pai_entry *def_entry_list;
133 };
134
135 /************************************************************************
136 Return a uint32 of the pai_entry principal.
137 ************************************************************************/
138
139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
140 {
141 switch (paie->owner_type) {
142 case UID_ACE:
143 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
144 return (uint32_t)paie->unix_ug.uid;
145 case GID_ACE:
146 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
147 return (uint32_t)paie->unix_ug.gid;
148 case WORLD_ACE:
149 default:
150 DEBUG(10,("get_pai_entry_val: world ace\n"));
151 return (uint32_t)-1;
152 }
153 }
154
155 /************************************************************************
156 Return a uint32 of the entry principal.
157 ************************************************************************/
158
159 static uint32_t get_entry_val(canon_ace *ace_entry)
160 {
161 switch (ace_entry->owner_type) {
162 case UID_ACE:
163 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
164 return (uint32_t)ace_entry->unix_ug.uid;
165 case GID_ACE:
166 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
167 return (uint32_t)ace_entry->unix_ug.gid;
168 case WORLD_ACE:
169 default:
170 DEBUG(10,("get_entry_val: world ace\n"));
171 return (uint32_t)-1;
172 }
173 }
174
175 /************************************************************************
176 Create the on-disk format (always v2 now). Caller must free.
177 ************************************************************************/
178
179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
180 canon_ace *dir_ace_list,
181 uint16_t sd_type,
182 size_t *store_size)
183 {
184 char *pai_buf = NULL;
185 canon_ace *ace_list = NULL;
186 char *entry_offset = NULL;
187 unsigned int num_entries = 0;
188 unsigned int num_def_entries = 0;
189 unsigned int i;
190
191 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
192 num_entries++;
193 }
194
195 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
196 num_def_entries++;
197 }
198
199 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
200
201 *store_size = PAI_V2_ENTRIES_BASE +
202 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
203
204 pai_buf = talloc_array(talloc_tos(), char, *store_size);
205 if (!pai_buf) {
206 return NULL;
207 }
208
209 /* Set up the header. */
210 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
211 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
212 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
213 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
214 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
215
216 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
217 (unsigned int)sd_type ));
218
219 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
220
221 i = 0;
222 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
223 uint8_t type_val = (uint8_t)ace_list->owner_type;
224 uint32_t entry_val = get_entry_val(ace_list);
225
226 SCVAL(entry_offset,0,ace_list->ace_flags);
227 SCVAL(entry_offset,1,type_val);
228 SIVAL(entry_offset,2,entry_val);
229 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
230 i,
231 (unsigned int)ace_list->ace_flags,
232 (unsigned int)type_val,
233 (unsigned int)entry_val ));
234 i++;
235 entry_offset += PAI_V2_ENTRY_LENGTH;
236 }
237
238 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
239 uint8_t type_val = (uint8_t)ace_list->owner_type;
240 uint32_t entry_val = get_entry_val(ace_list);
241
242 SCVAL(entry_offset,0,ace_list->ace_flags);
243 SCVAL(entry_offset,1,type_val);
244 SIVAL(entry_offset,2,entry_val);
245 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
246 i,
247 (unsigned int)ace_list->ace_flags,
248 (unsigned int)type_val,
249 (unsigned int)entry_val ));
250 i++;
251 entry_offset += PAI_V2_ENTRY_LENGTH;
252 }
253
254 return pai_buf;
255 }
256
257 /************************************************************************
258 Store the user.SAMBA_PAI attribute on disk.
259 ************************************************************************/
260
261 static void store_inheritance_attributes(files_struct *fsp,
262 canon_ace *file_ace_list,
263 canon_ace *dir_ace_list,
264 uint16_t sd_type)
265 {
266 int ret;
267 size_t store_size;
268 char *pai_buf;
269
270 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
271 return;
272 }
273
274 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
275 sd_type, &store_size);
276
277 if (fsp->fh->fd != -1) {
278 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
279 pai_buf, store_size, 0);
280 } else {
281 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
282 SAMBA_POSIX_INHERITANCE_EA_NAME,
283 pai_buf, store_size, 0);
284 }
285
286 TALLOC_FREE(pai_buf);
287
288 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
289 (unsigned int)sd_type,
290 fsp_str_dbg(fsp)));
291
292 if (ret == -1 && !no_acl_syscall_error(errno)) {
293 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
294 }
295 }
296
297 /************************************************************************
298 Delete the in memory inheritance info.
299 ************************************************************************/
300
301 static void free_inherited_info(struct pai_val *pal)
302 {
303 if (pal) {
304 struct pai_entry *paie, *paie_next;
305 for (paie = pal->entry_list; paie; paie = paie_next) {
306 paie_next = paie->next;
307 TALLOC_FREE(paie);
308 }
309 for (paie = pal->def_entry_list; paie; paie = paie_next) {
310 paie_next = paie->next;
311 TALLOC_FREE(paie);
312 }
313 TALLOC_FREE(pal);
314 }
315 }
316
317 /************************************************************************
318 Get any stored ACE flags.
319 ************************************************************************/
320
321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
322 {
323 struct pai_entry *paie;
324
325 if (!pal) {
326 return 0;
327 }
328
329 /* If the entry exists it is inherited. */
330 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
331 if (ace_entry->owner_type == paie->owner_type &&
332 get_entry_val(ace_entry) == get_pai_entry_val(paie))
333 return paie->ace_flags;
334 }
335 return 0;
336 }
337
338 /************************************************************************
339 Ensure an attribute just read is valid - v1.
340 ************************************************************************/
341
342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
343 {
344 uint16 num_entries;
345 uint16 num_def_entries;
346
347 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
348 /* Corrupted - too small. */
349 return false;
350 }
351
352 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
353 return false;
354 }
355
356 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
357 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
358
359 /* Check the entry lists match. */
360 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
361
362 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
363 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
364 return false;
365 }
366
367 return true;
368 }
369
370 /************************************************************************
371 Ensure an attribute just read is valid - v2.
372 ************************************************************************/
373
374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
375 {
376 uint16 num_entries;
377 uint16 num_def_entries;
378
379 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
380 /* Corrupted - too small. */
381 return false;
382 }
383
384 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
385 return false;
386 }
387
388 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
389 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
390
391 /* Check the entry lists match. */
392 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
393
394 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
395 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
396 return false;
397 }
398
399 return true;
400 }
401
402 /************************************************************************
403 Decode the owner.
404 ************************************************************************/
405
406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
407 {
408 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
409 switch( paie->owner_type) {
410 case UID_ACE:
411 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
412 DEBUG(10,("get_pai_owner_type: uid = %u\n",
413 (unsigned int)paie->unix_ug.uid ));
414 break;
415 case GID_ACE:
416 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
417 DEBUG(10,("get_pai_owner_type: gid = %u\n",
418 (unsigned int)paie->unix_ug.gid ));
419 break;
420 case WORLD_ACE:
421 paie->unix_ug.world = -1;
422 DEBUG(10,("get_pai_owner_type: world ace\n"));
423 break;
424 default:
425 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
426 (unsigned int)paie->owner_type ));
427 return false;
428 }
429 return true;
430 }
431
432 /************************************************************************
433 Process v2 entries.
434 ************************************************************************/
435
436 static const char *create_pai_v1_entries(struct pai_val *paiv,
437 const char *entry_offset,
438 bool def_entry)
439 {
440 int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 const char *u_name = uidtoname(pace->unix_ug.uid);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.gid);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
866
867 return ret;
868 }
869
870 /****************************************************************************
871 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
872 ****************************************************************************/
873
874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
875 {
876 mode_t ret = 0;
877
878 if (mode & r_mask)
879 ret |= S_IRUSR;
880 if (mode & w_mask)
881 ret |= S_IWUSR;
882 if (mode & x_mask)
883 ret |= S_IXUSR;
884
885 return ret;
886 }
887
888 /****************************************************************************
889 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
890 an SMB_ACL_PERMSET_T.
891 ****************************************************************************/
892
893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
907 return -1;
908 }
909 return 0;
910 }
911
912 /****************************************************************************
913 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
914 ****************************************************************************/
915
916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same. */
953
954 if (!dir_acl) {
955 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
956 (curr_ace->attr == curr_ace_outer->attr));
957 } else {
958 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
959 (curr_ace->type == curr_ace_outer->type) &&
960 (curr_ace->attr == curr_ace_outer->attr));
961 }
962
963 if (can_merge) {
964 if( DEBUGLVL( 10 )) {
965 dbgtext("merge_aces: Merging ACE's\n");
966 print_canon_ace( curr_ace_outer, 0);
967 print_canon_ace( curr_ace, 0);
968 }
969
970 /* Merge two allow or two deny ACE's. */
971
972 /* Theoretically we shouldn't merge a dir ACE if
973 * one ACE has the CI flag set, and the other
974 * ACE has the OI flag set, but this is rare
975 * enough we can ignore it. */
976
977 curr_ace_outer->perms |= curr_ace->perms;
978 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
979 DLIST_REMOVE(l_head, curr_ace);
980 TALLOC_FREE(curr_ace);
981 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
982 }
983 }
984 }
985
986 /*
987 * Now go through and mask off allow permissions with deny permissions.
988 * We can delete either the allow or deny here as we know that each SID
989 * appears only once in the list.
990 */
991
992 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
993 canon_ace *curr_ace;
994 canon_ace *curr_ace_next;
995
996 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
997
998 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
999
1000 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002 /*
1003 * Subtract ACE's with different entries. Due to the ordering constraints
1004 * we've put on the ACL, we know the deny must be the first one.
1005 */
1006
1007 if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010 if( DEBUGLVL( 10 )) {
1011 dbgtext("merge_aces: Masking ACE's\n");
1012 print_canon_ace( curr_ace_outer, 0);
1013 print_canon_ace( curr_ace, 0);
1014 }
1015
1016 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018 if (curr_ace->perms == 0) {
1019
1020 /*
1021 * The deny overrides the allow. Remove the allow.
1022 */
1023
1024 DLIST_REMOVE(l_head, curr_ace);
1025 TALLOC_FREE(curr_ace);
1026 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028 } else {
1029
1030 /*
1031 * Even after removing permissions, there
1032 * are still allow permissions - delete the deny.
1033 * It is safe to delete the deny here,
1034 * as we are guarenteed by the deny first
1035 * ordering that all the deny entries for
1036 * this SID have already been merged into one
1037 * before we can get to an allow ace.
1038 */
1039
1040 DLIST_REMOVE(l_head, curr_ace_outer);
1041 TALLOC_FREE(curr_ace_outer);
1042 break;
1043 }
1044 }
1045
1046 } /* end for curr_ace */
1047 } /* end for curr_ace_outer */
1048
1049 /* We may have modified the list. */
1050
1051 *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055 Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060 int compat = lp_acl_compatibility();
1061
1062 if (compat == ACL_COMPAT_AUTO) {
1063 enum remote_arch_types ra_type = get_remote_arch();
1064
1065 /* Automatically adapt to client */
1066 return (ra_type <= RA_WINNT);
1067 } else
1068 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073 Map canon_ace perms to permission bits NT.
1074 The attr element is not used here - we only process deny entries on set,
1075 not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079 enum security_ace_type *pacl_type,
1080 mode_t perms,
1081 bool directory_ace)
1082 {
1083 uint32_t nt_mask = 0;
1084
1085 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088 if (directory_ace) {
1089 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090 } else {
1091 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092 }
1093 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094 /*
1095 * Windows NT refuses to display ACEs with no permissions in them (but
1096 * they are perfectly legal with Windows 2000). If the ACE has empty
1097 * permissions we cannot use 0, so we use the otherwise unused
1098 * WRITE_OWNER permission, which we ignore when we set an ACL.
1099 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100 * to be changed in the future.
1101 */
1102
1103 if (nt4_compatible_acls())
1104 nt_mask = UNIX_ACCESS_NONE;
1105 else
1106 nt_mask = 0;
1107 } else {
1108 if (directory_ace) {
1109 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112 } else {
1113 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116 }
1117 }
1118
1119 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121 }
1122
1123 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124 (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126 return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130 Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139 mode_t mode = 0;
1140
1141 switch(type) {
1142 case S_IRUSR:
1143 if((*mask) & GENERIC_ALL_ACCESS)
1144 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145 else {
1146 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149 }
1150 break;
1151 case S_IRGRP:
1152 if((*mask) & GENERIC_ALL_ACCESS)
1153 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154 else {
1155 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158 }
1159 break;
1160 case S_IROTH:
1161 if((*mask) & GENERIC_ALL_ACCESS)
1162 mode = S_IROTH|S_IWOTH|S_IXOTH;
1163 else {
1164 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167 }
1168 break;
1169 }
1170
1171 return mode;
1172 }
1173
1174 /****************************************************************************
1175 Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179 uid_t *puser, gid_t *pgrp,
1180 uint32 security_info_sent, const struct
1181 security_descriptor *psd)
1182 {
1183 struct dom_sid owner_sid;
1184 struct dom_sid grp_sid;
1185
1186 *puser = (uid_t)-1;
1187 *pgrp = (gid_t)-1;
1188
1189 if(security_info_sent == 0) {
1190 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191 return NT_STATUS_OK;
1192 }
1193
1194 /*
1195 * Validate the owner and group SID's.
1196 */
1197
1198 memset(&owner_sid, '\0', sizeof(owner_sid));
1199 memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203 /*
1204 * Don't immediately fail if the owner sid cannot be validated.
1205 * This may be a group chown only set.
1206 */
1207
1208 if (security_info_sent & SECINFO_OWNER) {
1209 sid_copy(&owner_sid, psd->owner_sid);
1210 if (!sid_to_uid(&owner_sid, puser)) {
1211 if (lp_force_unknown_acl_user(SNUM(conn))) {
1212 /* this allows take ownership to work
1213 * reasonably */
1214 *puser = get_current_uid(conn);
1215 } else {
1216 DEBUG(3,("unpack_nt_owners: unable to validate"
1217 " owner sid for %s\n",
1218 sid_string_dbg(&owner_sid)));
1219 return NT_STATUS_INVALID_OWNER;
1220 }
1221 }
1222 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223 (unsigned int)*puser ));
1224 }
1225
1226 /*
1227 * Don't immediately fail if the group sid cannot be validated.
1228 * This may be an owner chown only set.
1229 */
1230
1231 if (security_info_sent & SECINFO_GROUP) {
1232 sid_copy(&grp_sid, psd->group_sid);
1233 if (!sid_to_gid( &grp_sid, pgrp)) {
1234 if (lp_force_unknown_acl_user(SNUM(conn))) {
1235 /* this allows take group ownership to work
1236 * reasonably */
1237 *pgrp = get_current_gid(conn);
1238 } else {
1239 DEBUG(3,("unpack_nt_owners: unable to validate"
1240 " group sid.\n"));
1241 return NT_STATUS_INVALID_OWNER;
1242 }
1243 }
1244 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245 (unsigned int)*pgrp));
1246 }
1247
1248 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250 return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254 Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258 const bool is_directory, canon_ace *pace,
1259 mode_t type)
1260 {
1261 mode_t and_bits = (mode_t)0;
1262 mode_t or_bits = (mode_t)0;
1263
1264 /* Get the initial bits to apply. */
1265
1266 if (is_directory) {
1267 and_bits = lp_dir_security_mask(params->service);
1268 or_bits = lp_force_dir_security_mode(params->service);
1269 } else {
1270 and_bits = lp_security_mask(params->service);
1271 or_bits = lp_force_security_mode(params->service);
1272 }
1273
1274 /* Now bounce them into the S_USR space. */
1275 switch(type) {
1276 case S_IRUSR:
1277 /* Ensure owner has read access. */
1278 pace->perms |= S_IRUSR;
1279 if (is_directory)
1280 pace->perms |= (S_IWUSR|S_IXUSR);
1281 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283 break;
1284 case S_IRGRP:
1285 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287 break;
1288 case S_IROTH:
1289 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291 break;
1292 }
1293
1294 pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298 Check if a given uid/SID is in a group gid/SID. This is probably very
1299 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304 const char *u_name = NULL;
1305
1306 /* "Everyone" always matches every uid. */
1307
1308 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309 return True;
1310
1311 /*
1312 * if it's the current user, we already have the unix token
1313 * and don't need to do the complex user_in_group_sid() call
1314 */
1315 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316 const struct security_unix_token *curr_utok = NULL;
1317 size_t i;
1318
1319 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320 return True;
1321 }
1322
1323 curr_utok = get_current_utok(conn);
1324 for (i=0; i < curr_utok->ngroups; i++) {
1325 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326 return True;
1327 }
1328 }
1329 }
1330
1331 /* u_name talloc'ed off tos. */
1332 u_name = uidtoname(uid_ace->unix_ug.uid);
1333 if (!u_name) {
1334 return False;
1335 }
1336
1337 /*
1338 * user_in_group_sid() uses create_token_from_username()
1339 * which creates an artificial NT token given just a username,
1340 * so this is not reliable for users from foreign domains
1341 * exported by winbindd!
1342 */
1343 return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347 A well formed POSIX file or default ACL has at least 3 entries, a
1348 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349 In addition, the owner must always have at least read access.
1350 When using this call on get_acl, the pst struct is valid and contains
1351 the mode of the file. When using this call on set_acl, the pst struct has
1352 been modified to have a mode containing the default for this file or directory
1353 type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357 const struct share_params *params,
1358 const bool is_directory,
1359 const struct dom_sid *pfile_owner_sid,
1360 const struct dom_sid *pfile_grp_sid,
1361 const SMB_STRUCT_STAT *pst,
1362 bool setting_acl)
1363 {
1364 canon_ace *pace;
1365 canon_ace *pace_user = NULL;
1366 canon_ace *pace_group = NULL;
1367 canon_ace *pace_other = NULL;
1368
1369 for (pace = *pp_ace; pace; pace = pace->next) {
1370 if (pace->type == SMB_ACL_USER_OBJ) {
1371
1372 if (setting_acl)
1373 apply_default_perms(params, is_directory, pace, S_IRUSR);
1374 pace_user = pace;
1375
1376 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1377
1378 /*
1379 * Ensure create mask/force create mode is respected on set.
1380 */
1381
1382 if (setting_acl)
1383 apply_default_perms(params, is_directory, pace, S_IRGRP);
1384 pace_group = pace;
1385
1386 } else if (pace->type == SMB_ACL_OTHER) {
1387
1388 /*
1389 * Ensure create mask/force create mode is respected on set.
1390 */
1391
1392 if (setting_acl)
1393 apply_default_perms(params, is_directory, pace, S_IROTH);
1394 pace_other = pace;
1395 }
1396 }
1397
1398 if (!pace_user) {
1399 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1400 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1401 return False;
1402 }
1403
1404 ZERO_STRUCTP(pace);
1405 pace->type = SMB_ACL_USER_OBJ;
1406 pace->owner_type = UID_ACE;
1407 pace->unix_ug.uid = pst->st_ex_uid;
1408 pace->trustee = *pfile_owner_sid;
1409 pace->attr = ALLOW_ACE;
1410 /* Start with existing permissions, principle of least
1411 surprises for the user. */
1412 pace->perms = pst->st_ex_mode;
1413
1414 if (setting_acl) {
1415 /* See if the owning user is in any of the other groups in
1416 the ACE, or if there's a matching user entry.
1417 If so, OR in the permissions from that entry. */
1418
1419 canon_ace *pace_iter;
1420
1421 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1422 if (pace_iter->type == SMB_ACL_USER &&
1423 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1424 pace->perms |= pace_iter->perms;
1425 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1426 if (uid_entry_in_group(conn, pace, pace_iter)) {
1427 pace->perms |= pace_iter->perms;
1428 }
1429 }
1430 }
1431
1432 if (pace->perms == 0) {
1433 /* If we only got an "everyone" perm, just use that. */
1434 if (pace_other)
1435 pace->perms = pace_other->perms;
1436 }
1437
1438 apply_default_perms(params, is_directory, pace, S_IRUSR);
1439 } else {
1440 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1441 }
1442
1443 DLIST_ADD(*pp_ace, pace);
1444 pace_user = pace;
1445 }
1446
1447 if (!pace_group) {
1448 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1449 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1450 return False;
1451 }
1452
1453 ZERO_STRUCTP(pace);
1454 pace->type = SMB_ACL_GROUP_OBJ;
1455 pace->owner_type = GID_ACE;
1456 pace->unix_ug.gid = pst->st_ex_gid;
1457 pace->trustee = *pfile_grp_sid;
1458 pace->attr = ALLOW_ACE;
1459 if (setting_acl) {
1460 /* If we only got an "everyone" perm, just use that. */
1461 if (pace_other)
1462 pace->perms = pace_other->perms;
1463 else
1464 pace->perms = 0;
1465 apply_default_perms(params, is_directory, pace, S_IRGRP);
1466 } else {
1467 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1468 }
1469
1470 DLIST_ADD(*pp_ace, pace);
1471 pace_group = pace;
1472 }
1473
1474 if (!pace_other) {
1475 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1476 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477 return False;
1478 }
1479
1480 ZERO_STRUCTP(pace);
1481 pace->type = SMB_ACL_OTHER;
1482 pace->owner_type = WORLD_ACE;
1483 pace->unix_ug.world = -1;
1484 pace->trustee = global_sid_World;
1485 pace->attr = ALLOW_ACE;
1486 if (setting_acl) {
1487 pace->perms = 0;
1488 apply_default_perms(params, is_directory, pace, S_IROTH);
1489 } else
1490 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492 DLIST_ADD(*pp_ace, pace);
1493 pace_other = pace;
1494 }
1495
1496 return True;
1497 }
1498
1499 /****************************************************************************
1500 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1501 If it does not have them, check if there are any entries where the trustee is the
1502 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1503 Note we must not do this to default directory ACLs.
1504 ****************************************************************************/
1505
1506 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1507 {
1508 bool got_user_obj, got_group_obj;
1509 canon_ace *current_ace;
1510 int i, entries;
1511
1512 entries = count_canon_ace_list(ace);
1513 got_user_obj = False;
1514 got_group_obj = False;
1515
1516 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1517 if (current_ace->type == SMB_ACL_USER_OBJ)
1518 got_user_obj = True;
1519 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1520 got_group_obj = True;
1521 }
1522 if (got_user_obj && got_group_obj) {
1523 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1524 return;
1525 }
1526
1527 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1528 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1529 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1530 current_ace->type = SMB_ACL_USER_OBJ;
1531 got_user_obj = True;
1532 }
1533 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1534 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1535 current_ace->type = SMB_ACL_GROUP_OBJ;
1536 got_group_obj = True;
1537 }
1538 }
1539 if (!got_user_obj)
1540 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1541 if (!got_group_obj)
1542 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1543 }
1544
1545 /****************************************************************************
1546 Unpack a struct security_descriptor into two canonical ace lists.
1547 ****************************************************************************/
1548
1549 static bool create_canon_ace_lists(files_struct *fsp,
1550 const SMB_STRUCT_STAT *pst,
1551 struct dom_sid *pfile_owner_sid,
1552 struct dom_sid *pfile_grp_sid,
1553 canon_ace **ppfile_ace,
1554 canon_ace **ppdir_ace,
1555 const struct security_acl *dacl)
1556 {
1557 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1558 canon_ace *file_ace = NULL;
1559 canon_ace *dir_ace = NULL;
1560 canon_ace *current_ace = NULL;
1561 bool got_dir_allow = False;
1562 bool got_file_allow = False;
1563 int i, j;
1564
1565 *ppfile_ace = NULL;
1566 *ppdir_ace = NULL;
1567
1568 /*
1569 * Convert the incoming ACL into a more regular form.
1570 */
1571
1572 for(i = 0; i < dacl->num_aces; i++) {
1573 struct security_ace *psa = &dacl->aces[i];
1574
1575 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1576 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1577 return False;
1578 }
1579
1580 if (nt4_compatible_acls()) {
1581 /*
1582 * The security mask may be UNIX_ACCESS_NONE which should map into
1583 * no permissions (we overload the WRITE_OWNER bit for this) or it
1584 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1585 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1586 */
1587
1588 /*
1589 * Convert GENERIC bits to specific bits.
1590 */
1591
1592 se_map_generic(&psa->access_mask, &file_generic_mapping);
1593
1594 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1595
1596 if(psa->access_mask != UNIX_ACCESS_NONE)
1597 psa->access_mask &= ~UNIX_ACCESS_NONE;
1598 }
1599 }
1600
1601 /*
1602 * Deal with the fact that NT 4.x re-writes the canonical format
1603 * that we return for default ACLs. If a directory ACE is identical
1604 * to a inherited directory ACE then NT changes the bits so that the
1605 * first ACE is set to OI|IO and the second ACE for this SID is set
1606 * to CI. We need to repair this. JRA.
1607 */
1608
1609 for(i = 0; i < dacl->num_aces; i++) {
1610 struct security_ace *psa1 = &dacl->aces[i];
1611
1612 for (j = i + 1; j < dacl->num_aces; j++) {
1613 struct security_ace *psa2 = &dacl->aces[j];
1614
1615 if (psa1->access_mask != psa2->access_mask)
1616 continue;
1617
1618 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1619 continue;
1620
1621 /*
1622 * Ok - permission bits and SIDs are equal.
1623 * Check if flags were re-written.
1624 */
1625
1626 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1627
1628 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1629 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1630
1631 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1632
1633 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1634 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1635
1636 }
1637 }
1638 }
1639
1640 for(i = 0; i < dacl->num_aces; i++) {
1641 struct security_ace *psa = &dacl->aces[i];
1642
1643 /*
1644 * Create a canon_ace entry representing this NT DACL ACE.
1645 */
1646
1647 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1648 free_canon_ace_list(file_ace);
1649 free_canon_ace_list(dir_ace);
1650 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1651 return False;
1652 }
1653
1654 ZERO_STRUCTP(current_ace);
1655
1656 sid_copy(&current_ace->trustee, &psa->trustee);
1657
1658 /*
1659 * Try and work out if the SID is a user or group
1660 * as we need to flag these differently for POSIX.
1661 * Note what kind of a POSIX ACL this should map to.
1662 */
1663
1664 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1665 current_ace->owner_type = WORLD_ACE;
1666 current_ace->unix_ug.world = -1;
1667 current_ace->type = SMB_ACL_OTHER;
1668 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1669 current_ace->owner_type = UID_ACE;
1670 current_ace->unix_ug.uid = pst->st_ex_uid;
1671 current_ace->type = SMB_ACL_USER_OBJ;
1672
1673 /*
1674 * The Creator Owner entry only specifies inheritable permissions,
1675 * never access permissions. WinNT doesn't always set the ACE to
1676 * INHERIT_ONLY, though.
1677 */
1678
1679 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1680
1681 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1682 current_ace->owner_type = GID_ACE;
1683 current_ace->unix_ug.gid = pst->st_ex_gid;
1684 current_ace->type = SMB_ACL_GROUP_OBJ;
1685
1686 /*
1687 * The Creator Group entry only specifies inheritable permissions,
1688 * never access permissions. WinNT doesn't always set the ACE to
1689 * INHERIT_ONLY, though.
1690 */
1691 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1692
1693 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1694 current_ace->owner_type = UID_ACE;
1695 /* If it's the owning user, this is a user_obj, not
1696 * a user. */
1697 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1698 current_ace->type = SMB_ACL_USER_OBJ;
1699 } else {
1700 current_ace->type = SMB_ACL_USER;
1701 }
1702 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1703 current_ace->owner_type = GID_ACE;
1704 /* If it's the primary group, this is a group_obj, not
1705 * a group. */
1706 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1707 current_ace->type = SMB_ACL_GROUP_OBJ;
1708 } else {
1709 current_ace->type = SMB_ACL_GROUP;
1710 }
1711 } else {
1712 /*
1713 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1714 */
1715
1716 if (non_mappable_sid(&psa->trustee)) {
1717 DEBUG(10, ("create_canon_ace_lists: ignoring "
1718 "non-mappable SID %s\n",
1719 sid_string_dbg(&psa->trustee)));
1720 TALLOC_FREE(current_ace);
1721 continue;
1722 }
1723
1724 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1725 DEBUG(10, ("create_canon_ace_lists: ignoring "
1726 "unknown or foreign SID %s\n",
1727 sid_string_dbg(&psa->trustee)));
1728 TALLOC_FREE(current_ace);
1729 continue;
1730 }
1731
1732 free_canon_ace_list(file_ace);
1733 free_canon_ace_list(dir_ace);
1734 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1735 "%s to uid or gid.\n",
1736 sid_string_dbg(&current_ace->trustee)));
1737 TALLOC_FREE(current_ace);
1738 return False;
1739 }
1740
1741 /*
1742 * Map the given NT permissions into a UNIX mode_t containing only
1743 * S_I(R|W|X)USR bits.
1744 */
1745
1746 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1747 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1748
1749 /* Store the ace_flag. */
1750 current_ace->ace_flags = psa->flags;
1751
1752 /*
1753 * Now add the created ace to either the file list, the directory
1754 * list, or both. We *MUST* preserve the order here (hence we use
1755 * DLIST_ADD_END) as NT ACLs are order dependent.
1756 */
1757
1758 if (fsp->is_directory) {
1759
1760 /*
1761 * We can only add to the default POSIX ACE list if the ACE is
1762 * designed to be inherited by both files and directories.
1763 */
1764
1765 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1766 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1767
1768 canon_ace *current_dir_ace = current_ace;
1769 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1770
1771 /*
1772 * Note if this was an allow ace. We can't process
1773 * any further deny ace's after this.
1774 */
1775
1776 if (current_ace->attr == ALLOW_ACE)
1777 got_dir_allow = True;
1778
1779 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1780 DEBUG(0,("create_canon_ace_lists: "
1781 "malformed ACL in "
1782 "inheritable ACL! Deny entry "
1783 "after Allow entry. Failing "
1784 "to set on file %s.\n",
1785 fsp_str_dbg(fsp)));
1786 free_canon_ace_list(file_ace);
1787 free_canon_ace_list(dir_ace);
1788 return False;
1789 }
1790
1791 if( DEBUGLVL( 10 )) {
1792 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1793 print_canon_ace( current_ace, 0);
1794 }
1795
1796 /*
1797 * If this is not an inherit only ACE we need to add a duplicate
1798 * to the file acl.
1799 */
1800
1801 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1802 canon_ace *dup_ace = dup_canon_ace(current_ace);
1803
1804 if (!dup_ace) {
1805 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1806 free_canon_ace_list(file_ace);
1807 free_canon_ace_list(dir_ace);
1808 return False;
1809 }
1810
1811 /*
1812 * We must not free current_ace here as its
1813 * pointer is now owned by the dir_ace list.
1814 */
1815 current_ace = dup_ace;
1816 /* We've essentially split this ace into two,
1817 * and added the ace with inheritance request
1818 * bits to the directory ACL. Drop those bits for
1819 * the ACE we're adding to the file list. */
1820 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1821 SEC_ACE_FLAG_CONTAINER_INHERIT|
1822 SEC_ACE_FLAG_INHERIT_ONLY);
1823 } else {
1824 /*
1825 * We must not free current_ace here as its
1826 * pointer is now owned by the dir_ace list.
1827 */
1828 current_ace = NULL;
1829 }
1830
1831 /*
1832 * current_ace is now either owned by file_ace
1833 * or is NULL. We can safely operate on current_dir_ace
1834 * to treat mapping for default acl entries differently
1835 * than access acl entries.
1836 */
1837
1838 if (current_dir_ace->owner_type == UID_ACE) {
1839 /*
1840 * We already decided above this is a uid,
1841 * for default acls ace's only CREATOR_OWNER
1842 * maps to ACL_USER_OBJ. All other uid
1843 * ace's are ACL_USER.
1844 */
1845 if (dom_sid_equal(&current_dir_ace->trustee,
1846 &global_sid_Creator_Owner)) {
1847 current_dir_ace->type = SMB_ACL_USER_OBJ;
1848 } else {
1849 current_dir_ace->type = SMB_ACL_USER;
1850 }
1851 }
1852
1853 if (current_dir_ace->owner_type == GID_ACE) {
1854 /*
1855 * We already decided above this is a gid,
1856 * for default acls ace's only CREATOR_GROUP
1857 * maps to ACL_GROUP_OBJ. All other uid
1858 * ace's are ACL_GROUP.
1859 */
1860 if (dom_sid_equal(&current_dir_ace->trustee,
1861 &global_sid_Creator_Group)) {
1862 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1863 } else {
1864 current_dir_ace->type = SMB_ACL_GROUP;
1865 }
1866 }
1867 }
1868 }
1869
1870 /*
1871 * Only add to the file ACL if not inherit only.
1872 */
1873
1874 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1875 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1876
1877 /*
1878 * Note if this was an allow ace. We can't process
1879 * any further deny ace's after this.
1880 */
1881
1882 if (current_ace->attr == ALLOW_ACE)
1883 got_file_allow = True;
1884
1885 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1886 DEBUG(0,("create_canon_ace_lists: malformed "
1887 "ACL in file ACL ! Deny entry after "
1888 "Allow entry. Failing to set on file "
1889 "%s.\n", fsp_str_dbg(fsp)));
1890 free_canon_ace_list(file_ace);
1891 free_canon_ace_list(dir_ace);
1892 return False;
1893 }
1894
1895 if( DEBUGLVL( 10 )) {
1896 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1897 print_canon_ace( current_ace, 0);
1898 }
1899 all_aces_are_inherit_only = False;
1900 /*
1901 * We must not free current_ace here as its
1902 * pointer is now owned by the file_ace list.
1903 */
1904 current_ace = NULL;
1905 }
1906
1907 /*
1908 * Free if ACE was not added.
1909 */
1910
1911 TALLOC_FREE(current_ace);
1912 }
1913
1914 if (fsp->is_directory && all_aces_are_inherit_only) {
1915 /*
1916 * Windows 2000 is doing one of these weird 'inherit acl'
1917 * traverses to conserve NTFS ACL resources. Just pretend
1918 * there was no DACL sent. JRA.
1919 */
1920
1921 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1922 free_canon_ace_list(file_ace);
1923 free_canon_ace_list(dir_ace);
1924 file_ace = NULL;
1925 dir_ace = NULL;
1926 } else {
1927 /*
1928 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1929 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1930 * entries can be converted to *_OBJ. Don't do this for the default
1931 * ACL, we will create them separately for this if needed inside
1932 * ensure_canon_entry_valid().
1933 */
1934 if (file_ace) {
1935 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1936 }
1937 }
1938
1939 *ppfile_ace = file_ace;
1940 *ppdir_ace = dir_ace;
1941
1942 return True;
1943 }
1944
1945 /****************************************************************************
1946 ASCII art time again... JRA :-).
1947
1948 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1949 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1950 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1951 allow or deny have been merged, so the same SID can only appear once in the deny
1952 list or once in the allow list.
1953
1954 We then process as follows :
1955
1956 ---------------------------------------------------------------------------
1957 First pass - look for a Everyone DENY entry.
1958
1959 If it is deny all (rwx) trunate the list at this point.
1960 Else, walk the list from this point and use the deny permissions of this
1961 entry as a mask on all following allow entries. Finally, delete
1962 the Everyone DENY entry (we have applied it to everything possible).
1963
1964 In addition, in this pass we remove any DENY entries that have
1965 no permissions (ie. they are a DENY nothing).
1966 ---------------------------------------------------------------------------
1967 Second pass - only deal with deny user entries.
1968
1969 DENY user1 (perms XXX)
1970
1971 new_perms = 0
1972 for all following allow group entries where user1 is in group
1973 new_perms |= group_perms;
1974
1975 user1 entry perms = new_perms & ~ XXX;
1976
1977 Convert the deny entry to an allow entry with the new perms and
1978 push to the end of the list. Note if the user was in no groups
1979 this maps to a specific allow nothing entry for this user.
1980
1981 The common case from the NT ACL choser (userX deny all) is
1982 optimised so we don't do the group lookup - we just map to
1983 an allow nothing entry.
1984
1985 What we're doing here is inferring the allow permissions the
1986 person setting the ACE on user1 wanted by looking at the allow
1987 permissions on the groups the user is currently in. This will
1988 be a snapshot, depending on group membership but is the best
1989 we can do and has the advantage of failing closed rather than
1990 open.
1991 ---------------------------------------------------------------------------
1992 Third pass - only deal with deny group entries.
1993
1994 DENY group1 (perms XXX)
1995
1996 for all following allow user entries where user is in group1
1997 user entry perms = user entry perms & ~ XXX;
1998
1999 If there is a group Everyone allow entry with permissions YYY,
2000 convert the group1 entry to an allow entry and modify its
2001 permissions to be :
2002
2003 new_perms = YYY & ~ XXX
2004
2005 and push to the end of the list.
2006
2007 If there is no group Everyone allow entry then convert the
2008 group1 entry to a allow nothing entry and push to the end of the list.
2009
2010 Note that the common case from the NT ACL choser (groupX deny all)
2011 cannot be optimised here as we need to modify user entries who are
2012 in the group to change them to a deny all also.
2013
2014 What we're doing here is modifying the allow permissions of
2015 user entries (which are more specific in POSIX ACLs) to mask
2016 out the explicit deny set on the group they are in. This will
2017 be a snapshot depending on current group membership but is the
2018 best we can do and has the advantage of failing closed rather
2019 than open.
2020 ---------------------------------------------------------------------------
2021 Fourth pass - cope with cumulative permissions.
2022
2023 for all allow user entries, if there exists an allow group entry with
2024 more permissive permissions, and the user is in that group, rewrite the
2025 allow user permissions to contain both sets of permissions.
2026
2027 Currently the code for this is #ifdef'ed out as these semantics make
2028 no sense to me. JRA.
2029 ---------------------------------------------------------------------------
2030
2031 Note we *MUST* do the deny user pass first as this will convert deny user
2032 entries into allow user entries which can then be processed by the deny
2033 group pass.
2034
2035 The above algorithm took a *lot* of thinking about - hence this
2036 explaination :-). JRA.
2037 ****************************************************************************/
2038
2039 /****************************************************************************
2040 Process a canon_ace list entries. This is very complex code. We need
2041 to go through and remove the "deny" permissions from any allow entry that matches
2042 the id of this entry. We have already refused any NT ACL that wasn't in correct
2043 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2044 we just remove it (to fail safe). We have already removed any duplicate ace
2045 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2046 allow entries.
2047 ****************************************************************************/
2048
2049 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2050 {
2051 canon_ace *ace_list = *pp_ace_list;
2052 canon_ace *curr_ace = NULL;
2053 canon_ace *curr_ace_next = NULL;
2054
2055 /* Pass 1 above - look for an Everyone, deny entry. */
2056
2057 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2058 canon_ace *allow_ace_p;
2059
2060 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2061
2062 if (curr_ace->attr != DENY_ACE)
2063 continue;
2064
2065 if (curr_ace->perms == (mode_t)0) {
2066
2067 /* Deny nothing entry - delete. */
2068
2069 DLIST_REMOVE(ace_list, curr_ace);
2070 continue;
2071 }
2072
2073 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2074 continue;
2075
2076 /* JRATEST - assert. */
2077 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2078
2079 if (curr_ace->perms == ALL_ACE_PERMS) {
2080
2081 /*
2082 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2083 * list at this point including this entry.
2084 */
2085
2086 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2087
2088 free_canon_ace_list( curr_ace );
2089 if (prev_entry)
2090 DLIST_REMOVE(ace_list, prev_entry);
2091 else {
2092 /* We deleted the entire list. */
2093 ace_list = NULL;
2094 }
2095 break;
2096 }
2097
2098 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2099
2100 /*
2101 * Only mask off allow entries.
2102 */
2103
2104 if (allow_ace_p->attr != ALLOW_ACE)
2105 continue;
2106
2107 allow_ace_p->perms &= ~curr_ace->perms;
2108 }
2109
2110 /*
2111 * Now it's been applied, remove it.
2112 */
2113
2114 DLIST_REMOVE(ace_list, curr_ace);
2115 }
2116
2117 /* Pass 2 above - deal with deny user entries. */
2118
2119 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2120 mode_t new_perms = (mode_t)0;
2121 canon_ace *allow_ace_p;
2122
2123 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2124
2125 if (curr_ace->attr != DENY_ACE)
2126 continue;
2127
2128 if (curr_ace->owner_type != UID_ACE)
2129 continue;
2130
2131 if (curr_ace->perms == ALL_ACE_PERMS) {
2132
2133 /*
2134 * Optimisation - this is a deny everything to this user.
2135 * Convert to an allow nothing and push to the end of the list.
2136 */
2137
2138 curr_ace->attr = ALLOW_ACE;
2139 curr_ace->perms = (mode_t)0;
2140 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2141 continue;
2142 }
2143
2144 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2145
2146 if (allow_ace_p->attr != ALLOW_ACE)
2147 continue;
2148
2149 /* We process GID_ACE and WORLD_ACE entries only. */
2150
2151 if (allow_ace_p->owner_type == UID_ACE)
2152 continue;
2153
2154 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2155 new_perms |= allow_ace_p->perms;
2156 }
2157
2158 /*
2159 * Convert to a allow entry, modify the perms and push to the end
2160 * of the list.
2161 */
2162
2163 curr_ace->attr = ALLOW_ACE;
2164 curr_ace->perms = (new_perms & ~curr_ace->perms);
2165 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2166 }
2167
2168 /* Pass 3 above - deal with deny group entries. */
2169
2170 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2171 canon_ace *allow_ace_p;
2172 canon_ace *allow_everyone_p = NULL;
2173
2174 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2175
2176 if (curr_ace->attr != DENY_ACE)
2177 continue;
2178
2179 if (curr_ace->owner_type != GID_ACE)
2180 continue;
2181
2182 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2183
2184 if (allow_ace_p->attr != ALLOW_ACE)
2185 continue;
2186
2187 /* Store a pointer to the Everyone allow, if it exists. */
2188 if (allow_ace_p->owner_type == WORLD_ACE)
2189 allow_everyone_p = allow_ace_p;
2190
2191 /* We process UID_ACE entries only. */
2192
2193 if (allow_ace_p->owner_type != UID_ACE)
2194 continue;
2195
2196 /* Mask off the deny group perms. */
2197
2198 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2199 allow_ace_p->perms &= ~curr_ace->perms;
2200 }
2201
2202 /*
2203 * Convert the deny to an allow with the correct perms and
2204 * push to the end of the list.
2205 */
2206
2207 curr_ace->attr = ALLOW_ACE;
2208 if (allow_everyone_p)
2209 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2210 else
2211 curr_ace->perms = (mode_t)0;
2212 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2213 }
2214
2215 /* Doing this fourth pass allows Windows semantics to be layered
2216 * on top of POSIX semantics. I'm not sure if this is desirable.
2217 * For example, in W2K ACLs there is no way to say, "Group X no
2218 * access, user Y full access" if user Y is a member of group X.
2219 * This seems completely broken semantics to me.... JRA.
2220 */
2221
2222 #if 0
2223 /* Pass 4 above - deal with allow entries. */
2224
2225 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2226 canon_ace *allow_ace_p;
2227
2228 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2229
2230 if (curr_ace->attr != ALLOW_ACE)
2231 continue;
2232
2233 if (curr_ace->owner_type != UID_ACE)
2234 continue;
2235
2236 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2237
2238 if (allow_ace_p->attr != ALLOW_ACE)
2239 continue;
2240
2241 /* We process GID_ACE entries only. */
2242
2243 if (allow_ace_p->owner_type != GID_ACE)
2244 continue;
2245
2246 /* OR in the group perms. */
2247
2248 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2249 curr_ace->perms |= allow_ace_p->perms;
2250 }
2251 }
2252 #endif
2253
2254 *pp_ace_list = ace_list;
2255 }
2256
2257 /****************************************************************************
2258 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2259 succeeding.
2260 ****************************************************************************/
2261
2262 static bool unpack_canon_ace(files_struct *fsp,
2263 const SMB_STRUCT_STAT *pst,
2264 struct dom_sid *pfile_owner_sid,
2265 struct dom_sid *pfile_grp_sid,
2266 canon_ace **ppfile_ace,
2267 canon_ace **ppdir_ace,
2268 uint32 security_info_sent,
2269 const struct security_descriptor *psd)
2270 {
2271 canon_ace *file_ace = NULL;
2272 canon_ace *dir_ace = NULL;
2273
2274 *ppfile_ace = NULL;
2275 *ppdir_ace = NULL;
2276
2277 if(security_info_sent == 0) {
2278 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2279 return False;
2280 }
2281
2282 /*
2283 * If no DACL then this is a chown only security descriptor.
2284 */
2285
2286 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2287 return True;
2288
2289 /*
2290 * Now go through the DACL and create the canon_ace lists.
2291 */
2292
2293 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2294 &file_ace, &dir_ace, psd->dacl))
2295 return False;
2296
2297 if ((file_ace == NULL) && (dir_ace == NULL)) {
2298 /* W2K traverse DACL set - ignore. */
2299 return True;
2300 }
2301
2302 /*
2303 * Go through the canon_ace list and merge entries
2304 * belonging to identical users of identical allow or deny type.
2305 * We can do this as all deny entries come first, followed by
2306 * all allow entries (we have mandated this before accepting this acl).
2307 */
2308
2309 print_canon_ace_list( "file ace - before merge", file_ace);
2310 merge_aces( &file_ace, false);
2311
2312 print_canon_ace_list( "dir ace - before merge", dir_ace);
2313 merge_aces( &dir_ace, true);
2314
2315 /*
2316 * NT ACLs are order dependent. Go through the acl lists and
2317 * process DENY entries by masking the allow entries.
2318 */
2319
2320 print_canon_ace_list( "file ace - before deny", file_ace);
2321 process_deny_list(fsp->conn, &file_ace);
2322
2323 print_canon_ace_list( "dir ace - before deny", dir_ace);
2324 process_deny_list(fsp->conn, &dir_ace);
2325
2326 /*
2327 * A well formed POSIX file or default ACL has at least 3 entries, a
2328 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2329 * and optionally a mask entry. Ensure this is the case.
2330 */
2331
2332 print_canon_ace_list( "file ace - before valid", file_ace);
2333
2334 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2335 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2336 free_canon_ace_list(file_ace);
2337 free_canon_ace_list(dir_ace);
2338 return False;
2339 }
2340
2341 print_canon_ace_list( "dir ace - before valid", dir_ace);
2342
2343 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2344 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2345 free_canon_ace_list(file_ace);
2346 free_canon_ace_list(dir_ace);
2347 return False;
2348 }
2349
2350 print_canon_ace_list( "file ace - return", file_ace);
2351 print_canon_ace_list( "dir ace - return", dir_ace);
2352
2353 *ppfile_ace = file_ace;
2354 *ppdir_ace = dir_ace;
2355 return True;
2356
2357 }
2358
2359 /******************************************************************************
2360 When returning permissions, try and fit NT display
2361 semantics if possible. Note the the canon_entries here must have been malloced.
2362 The list format should be - first entry = owner, followed by group and other user
2363 entries, last entry = other.
2364
2365 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2366 are not ordered, and match on the most specific entry rather than walking a list,
2367 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2368
2369 Entry 0: owner : deny all except read and write.
2370 Entry 1: owner : allow read and write.
2371 Entry 2: group : deny all except read.
2372 Entry 3: group : allow read.
2373 Entry 4: Everyone : allow read.
2374
2375 But NT cannot display this in their ACL editor !
2376 ********************************************************************************/
2377
2378 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2379 {
2380 canon_ace *l_head = *pp_list_head;
2381 canon_ace *owner_ace = NULL;
2382 canon_ace *other_ace = NULL;
2383 canon_ace *ace = NULL;
2384
2385 for (ace = l_head; ace; ace = ace->next) {
2386 if (ace->type == SMB_ACL_USER_OBJ)
2387 owner_ace = ace;
2388 else if (ace->type == SMB_ACL_OTHER) {
2389 /* Last ace - this is "other" */
2390 other_ace = ace;
2391 }
2392 }
2393
2394 if (!owner_ace || !other_ace) {
2395 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2396 filename ));
2397 return;
2398 }
2399
2400 /*
2401 * The POSIX algorithm applies to owner first, and other last,
2402 * so ensure they are arranged in this order.
2403 */
2404
2405 if (owner_ace) {
2406 DLIST_PROMOTE(l_head, owner_ace);
2407 }
2408
2409 if (other_ace) {
2410 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2411 }
2412
2413 /* We have probably changed the head of the list. */
2414
2415 *pp_list_head = l_head;
2416 }
2417
2418 /****************************************************************************
2419 Create a linked list of canonical ACE entries.
2420 ****************************************************************************/
2421
2422 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2423 const char *fname, SMB_ACL_T posix_acl,
2424 const SMB_STRUCT_STAT *psbuf,
2425 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2426 {
2427 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2428 canon_ace *l_head = NULL;
2429 canon_ace *ace = NULL;
2430 canon_ace *next_ace = NULL;
2431 int entry_id = SMB_ACL_FIRST_ENTRY;
2432 SMB_ACL_ENTRY_T entry;
2433 size_t ace_count;
2434
2435 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2436 SMB_ACL_TAG_T tagtype;
2437 SMB_ACL_PERMSET_T permset;
2438 struct dom_sid sid;
2439 posix_id unix_ug;
2440 enum ace_owner owner_type;
2441
2442 entry_id = SMB_ACL_NEXT_ENTRY;
2443
2444 /* Is this a MASK entry ? */
2445 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2446 continue;
2447
2448 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2449 continue;
2450
2451 /* Decide which SID to use based on the ACL type. */
2452 switch(tagtype) {
2453 case SMB_ACL_USER_OBJ:
2454 /* Get the SID from the owner. */
2455 sid_copy(&sid, powner);
2456 unix_ug.uid = psbuf->st_ex_uid;
2457 owner_type = UID_ACE;
2458 break;
2459 case SMB_ACL_USER:
2460 {
2461 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2462 if (puid == NULL) {
2463 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2464 continue;
2465 }
2466 uid_to_sid( &sid, *puid);
2467 unix_ug.uid = *puid;
2468 owner_type = UID_ACE;
2469 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2470 break;
2471 }
2472 case SMB_ACL_GROUP_OBJ:
2473 /* Get the SID from the owning group. */
2474 sid_copy(&sid, pgroup);
2475 unix_ug.gid = psbuf->st_ex_gid;
2476 owner_type = GID_ACE;
2477 break;
2478 case SMB_ACL_GROUP:
2479 {
2480 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2481 if (pgid == NULL) {
2482 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2483 continue;
2484 }
2485 gid_to_sid( &sid, *pgid);
2486 unix_ug.gid = *pgid;
2487 owner_type = GID_ACE;
2488 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2489 break;
2490 }
2491 case SMB_ACL_MASK:
2492 acl_mask = convert_permset_to_mode_t(conn, permset);
2493 continue; /* Don't count the mask as an entry. */
2494 case SMB_ACL_OTHER:
2495 /* Use the Everyone SID */
2496 sid = global_sid_World;
2497 unix_ug.world = -1;
2498 owner_type = WORLD_ACE;
2499 break;
2500 default:
2501 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2502 continue;
2503 }
2504
2505 /*
2506 * Add this entry to the list.
2507 */
2508
2509 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2510 goto fail;
2511
2512 ZERO_STRUCTP(ace);
2513 ace->type = tagtype;
2514 ace->perms = convert_permset_to_mode_t(conn, permset);
2515 ace->attr = ALLOW_ACE;
2516 ace->trustee = sid;
2517 ace->unix_ug = unix_ug;
2518 ace->owner_type = owner_type;
2519 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2520
2521 DLIST_ADD(l_head, ace);
2522 }
2523
2524 /*
2525 * This next call will ensure we have at least a user/group/world set.
2526 */
2527
2528 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2529 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2530 psbuf, False))
2531 goto fail;
2532
2533 /*
2534 * Now go through the list, masking the permissions with the
2535 * acl_mask. Ensure all DENY Entries are at the start of the list.
2536 */
2537
2538 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2539
2540 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2541 next_ace = ace->next;
2542
2543 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2544 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2545 ace->perms &= acl_mask;
2546
2547 if (ace->perms == 0) {
2548 DLIST_PROMOTE(l_head, ace);
2549 }
2550
2551 if( DEBUGLVL( 10 ) ) {
2552 print_canon_ace(ace, ace_count);
2553 }
2554 }
2555
2556 arrange_posix_perms(fname,&l_head );
2557
2558 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2559
2560 return l_head;
2561
2562 fail:
2563
2564 free_canon_ace_list(l_head);
2565 return NULL;
2566 }
2567
2568 /****************************************************************************
2569 Check if the current user group list contains a given group.
2570 ****************************************************************************/
2571
2572 bool current_user_in_group(connection_struct *conn, gid_t gid)
2573 {
2574 int i;
2575 const struct security_unix_token *utok = get_current_utok(conn);
2576
2577 for (i = 0; i < utok->ngroups; i++) {
2578 if (utok->groups[i] == gid) {
2579 return True;
2580 }
2581 }
2582
2583 return False;
2584 }
2585
2586 /****************************************************************************
2587 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2588 ****************************************************************************/
2589
2590 static bool acl_group_override(connection_struct *conn,
2591 const struct smb_filename *smb_fname)
2592 {
2593 if ((errno != EPERM) && (errno != EACCES)) {
2594 return false;
2595 }
2596
2597 /* file primary group == user primary or supplementary group */
2598 if (lp_acl_group_control(SNUM(conn)) &&
2599 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2600 return true;
2601 }
2602
2603 /* user has writeable permission */
2604 if (lp_dos_filemode(SNUM(conn)) &&
2605 can_write_to_file(conn, smb_fname)) {
2606 return true;
2607 }
2608
2609 return false;
2610 }
2611
2612 /****************************************************************************
2613 Attempt to apply an ACL to a file or directory.
2614 ****************************************************************************/
2615
2616 static bool set_canon_ace_list(files_struct *fsp,
2617 canon_ace *the_ace,
2618 bool default_ace,
2619 const SMB_STRUCT_STAT *psbuf,
2620 bool *pacl_set_support)
2621 {
2622 connection_struct *conn = fsp->conn;
2623 bool ret = False;
2624 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2625 canon_ace *p_ace;
2626 int i;
2627 SMB_ACL_ENTRY_T mask_entry;
2628 bool got_mask_entry = False;
2629 SMB_ACL_PERMSET_T mask_permset;
2630 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2631 bool needs_mask = False;
2632 mode_t mask_perms = 0;
2633
2634 /* Use the psbuf that was passed in. */
2635 if (psbuf != &fsp->fsp_name->st) {
2636 fsp->fsp_name->st = *psbuf;
2637 }
2638
2639 #if defined(POSIX_ACL_NEEDS_MASK)
2640 /* HP-UX always wants to have a mask (called "class" there). */
2641 needs_mask = True;
2642 #endif
2643
2644 if (the_acl == NULL) {
2645
2646 if (!no_acl_syscall_error(errno)) {
2647 /*
2648 * Only print this error message if we have some kind of ACL
2649 * support that's not working. Otherwise we would always get this.
2650 */
2651 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2652 default_ace ? "default" : "file", strerror(errno) ));
2653 }
2654 *pacl_set_support = False;
2655 goto fail;
2656 }
2657
2658 if( DEBUGLVL( 10 )) {
2659 dbgtext("set_canon_ace_list: setting ACL:\n");
2660 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2661 print_canon_ace( p_ace, i);
2662 }
2663 }
2664
2665 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2666 SMB_ACL_ENTRY_T the_entry;
2667 SMB_ACL_PERMSET_T the_permset;
2668
2669 /*
2670 * ACLs only "need" an ACL_MASK entry if there are any named user or
2671 * named group entries. But if there is an ACL_MASK entry, it applies
2672 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2673 * so that it doesn't deny (i.e., mask off) any permissions.
2674 */
2675
2676 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2677 needs_mask = True;
2678 mask_perms |= p_ace->perms;
2679 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2680 mask_perms |= p_ace->perms;
2681 }
2682
2683 /*
2684 * Get the entry for this ACE.
2685 */
2686
2687 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2688 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2689 i, strerror(errno) ));
2690 goto fail;
2691 }
2692
2693 if (p_ace->type == SMB_ACL_MASK) {
2694 mask_entry = the_entry;
2695 got_mask_entry = True;
2696 }
2697
2698 /*
2699 * Ok - we now know the ACL calls should be working, don't
2700 * allow fallback to chmod.
2701 */
2702
2703 *pacl_set_support = True;
2704
2705 /*
2706 * Initialise the entry from the canon_ace.
2707 */
2708
2709 /*
2710 * First tell the entry what type of ACE this is.
2711 */
2712
2713 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2714 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2715 i, strerror(errno) ));
2716 goto fail;
2717 }
2718
2719 /*
2720 * Only set the qualifier (user or group id) if the entry is a user
2721 * or group id ACE.
2722 */
2723
2724 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2725 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2726 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2727 i, strerror(errno) ));
2728 goto fail;
2729 }
2730 }
2731
2732 /*
2733 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2734 */
2735
2736 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2737 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2738 i, strerror(errno) ));
2739 goto fail;
2740 }
2741
2742 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2743 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2744 (unsigned int)p_ace->perms, i, strerror(errno) ));
2745 goto fail;
2746 }
2747
2748 /*
2749 * ..and apply them to the entry.
2750 */
2751
2752 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2753 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2754 i, strerror(errno) ));
2755 goto fail;
2756 }
2757
2758 if( DEBUGLVL( 10 ))
2759 print_canon_ace( p_ace, i);
2760
2761 }
2762
2763 if (needs_mask && !got_mask_entry) {
2764 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2765 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2766 goto fail;
2767 }
2768
2769 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2770 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2771 goto fail;
2772 }
2773
2774 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2775 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2776 goto fail;
2777 }
2778
2779 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2780 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2781 goto fail;
2782 }
2783
2784 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2785 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2786 goto fail;
2787 }
2788 }
2789
2790 /*
2791 * Finally apply it to the file or directory.
2792 */
2793
2794 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2795 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2796 the_acl_type, the_acl) == -1) {
2797 /*
2798 * Some systems allow all the above calls and only fail with no ACL support
2799 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2800 */
2801 if (no_acl_syscall_error(errno)) {
2802 *pacl_set_support = False;
2803 }
2804
2805 if (acl_group_override(conn, fsp->fsp_name)) {
2806 int sret;
2807
2808 DEBUG(5,("set_canon_ace_list: acl group "
2809 "control on and current user in file "
2810 "%s primary group.\n",
2811 fsp_str_dbg(fsp)));
2812
2813 become_root();
2814 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2815 fsp->fsp_name->base_name, the_acl_type,
2816 the_acl);
2817 unbecome_root();
2818 if (sret == 0) {
2819 ret = True;
2820 }
2821 }
2822
2823 if (ret == False) {
2824 DEBUG(2,("set_canon_ace_list: "
2825 "sys_acl_set_file type %s failed for "
2826 "file %s (%s).\n",
2827 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2828 "directory default" : "file",
2829 fsp_str_dbg(fsp), strerror(errno)));
2830 goto fail;
2831 }
2832 }
2833 } else {
2834 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2835 /*
2836 * Some systems allow all the above calls and only fail with no ACL support
2837 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2838 */
2839 if (no_acl_syscall_error(errno)) {
2840 *pacl_set_support = False;
2841 }
2842
2843 if (acl_group_override(conn, fsp->fsp_name)) {
2844 int sret;
2845
2846 DEBUG(5,("set_canon_ace_list: acl group "
2847 "control on and current user in file "
2848 "%s primary group.\n",
2849 fsp_str_dbg(fsp)));
2850
2851 become_root();
2852 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2853 unbecome_root();
2854 if (sret == 0) {
2855 ret = True;
2856 }
2857 }
2858
2859 if (ret == False) {
2860 DEBUG(2,("set_canon_ace_list: "
2861 "sys_acl_set_file failed for file %s "
2862 "(%s).\n",
2863 fsp_str_dbg(fsp), strerror(errno)));
2864 goto fail;
2865 }
2866 }
2867 }
2868
2869 ret = True;
2870
2871 fail:
2872
2873 if (the_acl != NULL) {
2874 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2875 }
2876
2877 return ret;
2878 }
2879
2880 /****************************************************************************
2881 Find a particular canon_ace entry.
2882 ****************************************************************************/
2883
2884 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2885 {
2886 while (list) {
2887 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2888 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2889 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2890 break;
2891 list = list->next;
2892 }
2893 return list;
2894 }
2895
2896 /****************************************************************************
2897
2898 ****************************************************************************/
2899
2900 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2901 {
2902 SMB_ACL_ENTRY_T entry;
2903
2904 if (!the_acl)
2905 return NULL;
2906 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2907 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2908 return NULL;
2909 }
2910 return the_acl;
2911 }
2912
2913 /****************************************************************************
2914 Convert a canon_ace to a generic 3 element permission - if possible.
2915 ****************************************************************************/
2916
2917 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2918
2919 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2920 {
2921 int snum = SNUM(fsp->conn);
2922 size_t ace_count = count_canon_ace_list(file_ace_list);
2923 canon_ace *ace_p;
2924 canon_ace *owner_ace = NULL;
2925 canon_ace *group_ace = NULL;
2926 canon_ace *other_ace = NULL;
2927 mode_t and_bits;
2928 mode_t or_bits;
2929
2930 if (ace_count != 3) {
2931 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2932 "entries for file %s to convert to posix perms.\n",
2933 fsp_str_dbg(fsp)));
2934 return False;
2935 }
2936
2937 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2938 if (ace_p->owner_type == UID_ACE)
2939 owner_ace = ace_p;
2940 else if (ace_p->owner_type == GID_ACE)
2941 group_ace = ace_p;
2942 else if (ace_p->owner_type == WORLD_ACE)
2943 other_ace = ace_p;
2944 }
2945
2946 if (!owner_ace || !group_ace || !other_ace) {
2947 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
2948 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
2949 return False;
2950 }
2951
2952 *posix_perms = (mode_t)0;
2953
2954 *posix_perms |= owner_ace->perms;
2955 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2956 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2957 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2958 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2959 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2960 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2961
2962 /* The owner must have at least read access. */
2963
2964 *posix_perms |= S_IRUSR;
2965 if (fsp->is_directory)
2966 *posix_perms |= (S_IWUSR|S_IXUSR);
2967
2968 /* If requested apply the masks. */
2969
2970 /* Get the initial bits to apply. */
2971
2972 if (fsp->is_directory) {
2973 and_bits = lp_dir_security_mask(snum);
2974 or_bits = lp_force_dir_security_mode(snum);
2975 } else {
2976 and_bits = lp_security_mask(snum);
2977 or_bits = lp_force_security_mode(snum);
2978 }
2979
2980 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2981
2982 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
2983 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
2984 (int)group_ace->perms, (int)other_ace->perms,
2985 (int)*posix_perms, fsp_str_dbg(fsp)));
2986
2987 return True;
2988 }
2989
2990 /****************************************************************************
2991 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2992 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2993 with CI|OI set so it is inherited and also applies to the directory.
2994 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2995 ****************************************************************************/
2996
2997 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
2998 {
2999 size_t i, j;
3000
3001 for (i = 0; i < num_aces; i++) {
3002 for (j = i+1; j < num_aces; j++) {
3003 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3004 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3005 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3006 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3007
3008 /* We know the lower number ACE's are file entries. */
3009 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3010 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3011 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3012 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3013 (i_inh == j_inh) &&
3014 (i_flags_ni == 0) &&
3015 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3016 SEC_ACE_FLAG_CONTAINER_INHERIT|
3017 SEC_ACE_FLAG_INHERIT_ONLY))) {
3018 /*
3019 * W2K wants to have access allowed zero access ACE's
3020 * at the end of the list. If the mask is zero, merge
3021 * the non-inherited ACE onto the inherited ACE.
3022 */
3023
3024 if (nt_ace_list[i].access_mask == 0) {
3025 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3026 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3027 if (num_aces - i - 1 > 0)
3028 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3029 sizeof(struct security_ace));
3030
3031 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3032 (unsigned int)i, (unsigned int)j ));
3033 } else {
3034 /*
3035 * These are identical except for the flags.
3036 * Merge the inherited ACE onto the non-inherited ACE.
3037 */
3038
3039 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3040 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3041 if (num_aces - j - 1 > 0)
3042 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3043 sizeof(struct security_ace));
3044
3045 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3046 (unsigned int)j, (unsigned int)i ));
3047 }
3048 num_aces--;
3049 break;
3050 }
3051 }
3052 }
3053
3054 return num_aces;
3055 }
3056
3057 /*
3058 * Add or Replace ACE entry.
3059 * In some cases we need to add a specific ACE for compatibility reasons.
3060 * When doing that we must make sure we are not actually creating a duplicate
3061 * entry. So we need to search whether an ACE entry already exist and eventually
3062 * replacce the access mask, or add a completely new entry if none was found.
3063 *
3064 * This function assumes the array has enough space to add a new entry without
3065 * any reallocation of memory.
3066 */
3067
3068 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3069 const struct dom_sid *sid, enum security_ace_type type,
3070 uint32_t mask, uint8_t flags)
3071 {
3072 int i;
3073
3074 /* first search for a duplicate */
3075 for (i = 0; i < *num_aces; i++) {
3076 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3077 (nt_ace_list[i].flags == flags)) break;
3078 }
3079
3080 if (i < *num_aces) { /* found */
3081 nt_ace_list[i].type = type;
3082 nt_ace_list[i].access_mask = mask;
3083 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3084 i, sid_string_dbg(sid), flags));
3085 return;
3086 }
3087
3088 /* not found, append it */
3089 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3090 }
3091
3092
3093 /****************************************************************************
3094 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3095 the space for the return elements and returns the size needed to return the
3096 security descriptor. This should be the only external function needed for
3097 the UNIX style get ACL.
3098 ****************************************************************************/
3099
3100 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3101 const char *name,
3102 const SMB_STRUCT_STAT *sbuf,
3103 struct pai_val *pal,
3104 SMB_ACL_T posix_acl,
3105 SMB_ACL_T def_acl,
3106 uint32_t security_info,
3107 struct security_descriptor **ppdesc)
3108 {
3109 struct dom_sid owner_sid;
3110 struct dom_sid group_sid;
3111 size_t sd_size = 0;
3112 struct security_acl *psa = NULL;
3113 size_t num_acls = 0;
3114 size_t num_def_acls = 0;
3115 size_t num_aces = 0;
3116 canon_ace *file_ace = NULL;
3117 canon_ace *dir_ace = NULL;
3118 struct security_ace *nt_ace_list = NULL;
3119 size_t num_profile_acls = 0;
3120 struct dom_sid orig_owner_sid;
3121 struct security_descriptor *psd = NULL;
3122 int i;
3123
3124 /*
3125 * Get the owner, group and world SIDs.
3126 */
3127
3128 create_file_sids(sbuf, &owner_sid, &group_sid);
3129
3130 if (lp_profile_acls(SNUM(conn))) {
3131 /* For WXP SP1 the owner must be administrators. */
3132 sid_copy(&orig_owner_sid, &owner_sid);
3133 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3134 sid_copy(&group_sid, &global_sid_Builtin_Users);
3135 num_profile_acls = 3;
3136 }
3137
3138 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3139
3140 /*
3141 * In the optimum case Creator Owner and Creator Group would be used for
3142 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3143 * would lead to usability problems under Windows: The Creator entries
3144 * are only available in browse lists of directories and not for files;
3145 * additionally the identity of the owning group couldn't be determined.
3146 * We therefore use those identities only for Default ACLs.
3147 */
3148
3149 /* Create the canon_ace lists. */
3150 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3151 &owner_sid, &group_sid, pal,
3152 SMB_ACL_TYPE_ACCESS);
3153
3154 /* We must have *some* ACLS. */
3155
3156 if (count_canon_ace_list(file_ace) == 0) {
3157 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3158 goto done;
3159 }
3160
3161 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3162 dir_ace = canonicalise_acl(conn, name, def_acl,
3163 sbuf,
3164 &global_sid_Creator_Owner,
3165 &global_sid_Creator_Group,
3166 pal, SMB_ACL_TYPE_DEFAULT);
3167 }
3168
3169 /*
3170 * Create the NT ACE list from the canonical ace lists.
3171 */
3172
3173 {
3174 canon_ace *ace;
3175 enum security_ace_type nt_acl_type;
3176
3177 if (nt4_compatible_acls() && dir_ace) {
3178 /*
3179 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3180 * but no non-INHERIT_ONLY entry for one SID. So we only
3181 * remove entries from the Access ACL if the
3182 * corresponding Default ACL entries have also been
3183 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3184 * are exceptions. We can do nothing
3185 * intelligent if the Default ACL contains entries that
3186 * are not also contained in the Access ACL, so this
3187 * case will still fail under NT 4.
3188 */
3189
3190 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3191 if (ace && !ace->perms) {
3192 DLIST_REMOVE(dir_ace, ace);
3193 TALLOC_FREE(ace);
3194
3195 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3196 if (ace && !ace->perms) {
3197 DLIST_REMOVE(file_ace, ace);
3198 TALLOC_FREE(ace);
3199 }
3200 }
3201
3202 /*
3203 * WinNT doesn't usually have Creator Group
3204 * in browse lists, so we send this entry to
3205 * WinNT even if it contains no relevant
3206 * permissions. Once we can add
3207 * Creator Group to browse lists we can
3208 * re-enable this.
3209 */
3210
3211 #if 0
3212 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3213 if (ace && !ace->perms) {
3214 DLIST_REMOVE(dir_ace, ace);
3215 TALLOC_FREE(ace);
3216 }
3217 #endif
3218
3219 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3220 if (ace && !ace->perms) {
3221 DLIST_REMOVE(file_ace, ace);
3222 TALLOC_FREE(ace);
3223 }
3224 }
3225
3226 num_acls = count_canon_ace_list(file_ace);
3227 num_def_acls = count_canon_ace_list(dir_ace);
3228
3229 /* Allocate the ace list. */
3230 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3231 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3232 goto done;
3233 }
3234
3235 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3236
3237 /*
3238 * Create the NT ACE list from the canonical ace lists.
3239 */
3240
3241 for (ace = file_ace; ace != NULL; ace = ace->next) {
3242 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3243 &nt_acl_type,
3244 ace->perms,
3245 S_ISDIR(sbuf->st_ex_mode));
3246 init_sec_ace(&nt_ace_list[num_aces++],
3247 &ace->trustee,
3248 nt_acl_type,
3249 acc,
3250 ace->ace_flags);
3251 }
3252
3253 /* The User must have access to a profile share - even
3254 * if we can't map the SID. */
3255 if (lp_profile_acls(SNUM(conn))) {
3256 add_or_replace_ace(nt_ace_list, &num_aces,
3257 &global_sid_Builtin_Users,
3258 SEC_ACE_TYPE_ACCESS_ALLOWED,
3259 FILE_GENERIC_ALL, 0);
3260 }
3261
3262 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3263 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3264 &nt_acl_type,
3265 ace->perms,
3266 S_ISDIR(sbuf->st_ex_mode));
3267 init_sec_ace(&nt_ace_list[num_aces++],
3268 &ace->trustee,
3269 nt_acl_type,
3270 acc,
3271 ace->ace_flags |
3272 SEC_ACE_FLAG_OBJECT_INHERIT|
3273 SEC_ACE_FLAG_CONTAINER_INHERIT|
3274 SEC_ACE_FLAG_INHERIT_ONLY);
3275 }
3276
3277 /* The User must have access to a profile share - even
3278 * if we can't map the SID. */
3279 if (lp_profile_acls(SNUM(conn))) {
3280 add_or_replace_ace(nt_ace_list, &num_aces,
3281 &global_sid_Builtin_Users,
3282 SEC_ACE_TYPE_ACCESS_ALLOWED,
3283 FILE_GENERIC_ALL,
3284 SEC_ACE_FLAG_OBJECT_INHERIT |
3285 SEC_ACE_FLAG_CONTAINER_INHERIT |
3286 SEC_ACE_FLAG_INHERIT_ONLY);
3287 }
3288
3289 /*
3290 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3291 * Win2K needs this to get the inheritance correct when replacing ACLs
3292 * on a directory tree. Based on work by Jim @ IBM.
3293 */
3294
3295 num_aces = merge_default_aces(nt_ace_list, num_aces);
3296
3297 if (lp_profile_acls(SNUM(conn))) {
3298 for (i = 0; i < num_aces; i++) {
3299 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3300 add_or_replace_ace(nt_ace_list, &num_aces,
3301 &orig_owner_sid,
3302 nt_ace_list[i].type,
3303 nt_ace_list[i].access_mask,
3304 nt_ace_list[i].flags);
3305 break;
3306 }
3307 }
3308 }
3309 }
3310
3311 if (num_aces) {
3312 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3313 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3314 goto done;
3315 }
3316 }
3317 } /* security_info & SECINFO_DACL */
3318
3319 psd = make_standard_sec_desc( talloc_tos(),
3320 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3321 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3322 psa,
3323 &sd_size);
3324
3325 if(!psd) {
3326 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3327 sd_size = 0;
3328 goto done;
3329 }
3330
3331 /*
3332 * Windows 2000: The DACL_PROTECTED flag in the security
3333 * descriptor marks the ACL as non-inheriting, i.e., no
3334 * ACEs from higher level directories propagate to this
3335 * ACL. In the POSIX ACL model permissions are only
3336 * inherited at file create time, so ACLs never contain
3337 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3338 * flag doesn't seem to bother Windows NT.
3339 * Always set this if map acl inherit is turned off.
3340 */
3341 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3342 psd->type |= SEC_DESC_DACL_PROTECTED;
3343 } else {
3344 psd->type |= pal->sd_type;
3345 }
3346
3347 if (psd->dacl) {
3348 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3349 }
3350
3351 *ppdesc = psd;
3352
3353 done:
3354
3355 if (posix_acl) {
3356 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3357 }
3358 if (def_acl) {
3359 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3360 }
3361 free_canon_ace_list(file_ace);
3362 free_canon_ace_list(dir_ace);
3363 free_inherited_info(pal);
3364 TALLOC_FREE(nt_ace_list);
3365
3366 return NT_STATUS_OK;
3367 }
3368
3369 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3370 struct security_descriptor **ppdesc)
3371 {
3372 SMB_STRUCT_STAT sbuf;
3373 SMB_ACL_T posix_acl = NULL;
3374 struct pai_val *pal;
3375
3376 *ppdesc = NULL;
3377
3378 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3379 fsp_str_dbg(fsp)));
3380
3381 /* can it happen that fsp_name == NULL ? */
3382 if (fsp->is_directory || fsp->fh->fd == -1) {
3383 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3384 security_info, ppdesc);
3385 }
3386
3387 /* Get the stat struct for the owner info. */
3388 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3389 return map_nt_error_from_unix(errno);
3390 }
3391
3392 /* Get the ACL from the fd. */
3393 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3394
3395 pal = fload_inherited_info(fsp);
3396
3397 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3398 &sbuf, pal, posix_acl, NULL,
3399 security_info, ppdesc);
3400 }
3401
3402 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3403 uint32_t security_info, struct security_descriptor **ppdesc)
3404 {
3405 SMB_ACL_T posix_acl = NULL;
3406 SMB_ACL_T def_acl = NULL;
3407 struct pai_val *pal;
3408 struct smb_filename smb_fname;
3409 int ret;
3410
3411 *ppdesc = NULL;
3412
3413 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3414
3415 ZERO_STRUCT(smb_fname);
3416 smb_fname.base_name = discard_const_p(char, name);
3417
3418 /* Get the stat struct for the owner info. */
3419 if (lp_posix_pathnames()) {
3420 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3421 } else {
3422 ret = SMB_VFS_STAT(conn, &smb_fname);
3423 }
3424
3425 if (ret == -1) {
3426 return map_nt_error_from_unix(errno);
3427 }
3428
3429 /* Get the ACL from the path. */
3430 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3431
3432 /* If it's a directory get the default POSIX ACL. */
3433 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3434 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3435 def_acl = free_empty_sys_acl(conn, def_acl);
3436 }
3437
3438 pal = load_inherited_info(conn, name);
3439
3440 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3441 posix_acl, def_acl, security_info,
3442 ppdesc);
3443 }
3444
3445 /****************************************************************************
3446 Try to chown a file. We will be able to chown it under the following conditions.
3447
3448 1) If we have root privileges, then it will just work.
3449 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3450 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3451 4) If we have write permission to the file and dos_filemodes is set
3452 then allow chown to the currently authenticated user.
3453 ****************************************************************************/
3454
3455 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3456 {
3457 NTSTATUS status;
3458
3459 if(!CAN_WRITE(fsp->conn)) {
3460 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3461 }
3462
3463 /* Case (1). */
3464 status = vfs_chown_fsp(fsp, uid, gid);
3465 if (NT_STATUS_IS_OK(status)) {
3466 return status;
3467 }
3468
3469 /* Case (2) / (3) */
3470 if (lp_enable_privileges()) {
3471 bool has_take_ownership_priv = security_token_has_privilege(
3472 get_current_nttok(fsp->conn),
3473 SEC_PRIV_TAKE_OWNERSHIP);
3474 bool has_restore_priv = security_token_has_privilege(
3475 get_current_nttok(fsp->conn),
3476 SEC_PRIV_RESTORE);
3477
3478 if (has_restore_priv) {
3479 ; /* Case (2) */
3480 } else if (has_take_ownership_priv) {
3481 /* Case (3) */
3482 if (uid == get_current_uid(fsp->conn)) {
3483 gid = (gid_t)-1;
3484 } else {
3485 has_take_ownership_priv = false;
3486 }
3487 }
3488
3489 if (has_take_ownership_priv || has_restore_priv) {
3490 become_root();
3491 status = vfs_chown_fsp(fsp, uid, gid);
3492 unbecome_root();
3493 return status;
3494 }
3495 }
3496
3497 /* Case (4). */
3498 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3499 return NT_STATUS_ACCESS_DENIED;
3500 }
3501
3502 /* only allow chown to the current user. This is more secure,
3503 and also copes with the case where the SID in a take ownership ACL is
3504 a local SID on the users workstation
3505 */
3506 if (uid != get_current_uid(fsp->conn)) {
3507 return NT_STATUS_ACCESS_DENIED;
3508 }
3509
3510 become_root();
3511 /* Keep the current file gid the same. */
3512 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3513 unbecome_root();
3514
3515 return status;
3516 }
3517
3518 #if 0
3519 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3520
3521 /****************************************************************************
3522 Take care of parent ACL inheritance.
3523 ****************************************************************************/
3524
3525 NTSTATUS append_parent_acl(files_struct *fsp,
3526 const struct security_descriptor *pcsd,
3527 struct security_descriptor **pp_new_sd)
3528 {
3529 struct smb_filename *smb_dname = NULL;
3530 struct security_descriptor *parent_sd = NULL;
3531 files_struct *parent_fsp = NULL;
3532 TALLOC_CTX *mem_ctx = talloc_tos();
3533 char *parent_name = NULL;
3534 struct security_ace *new_ace = NULL;
3535 unsigned int num_aces = pcsd->dacl->num_aces;
3536 NTSTATUS status;
3537 int info;
3538 unsigned int i, j;
3539 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3540 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3541
3542 if (psd == NULL) {
3543 return NT_STATUS_NO_MEMORY;
3544 }
3545
3546 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3547 NULL)) {
3548 return NT_STATUS_NO_MEMORY;
3549 }
3550
3551 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3552 &smb_dname);
3553 if (!NT_STATUS_IS_OK(status)) {
3554 goto fail;
3555 }
3556
3557 status = SMB_VFS_CREATE_FILE(
3558 fsp->conn, /* conn */
3559 NULL, /* req */
3560 0, /* root_dir_fid */
3561 smb_dname, /* fname */
3562 FILE_READ_ATTRIBUTES, /* access_mask */
3563 FILE_SHARE_NONE, /* share_access */
3564 FILE_OPEN, /* create_disposition*/
3565 FILE_DIRECTORY_FILE, /* create_options */
3566 0, /* file_attributes */
3567 INTERNAL_OPEN_ONLY, /* oplock_request */
3568 0, /* allocation_size */
3569 NULL, /* sd */
3570 NULL, /* ea_list */
3571 &parent_fsp, /* result */
3572 &info); /* pinfo */
3573
3574 if (!NT_STATUS_IS_OK(status)) {
3575 TALLOC_FREE(smb_dname);
3576 return status;
3577 }
3578
3579 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3580 SECINFO_DACL, &parent_sd );
3581
3582 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3583 TALLOC_FREE(smb_dname);
3584
3585 if (!NT_STATUS_IS_OK(status)) {
3586 return status;
3587 }
3588
3589 /*
3590 * Make room for potentially all the ACLs from
3591 * the parent. We used to add the ugw triple here,
3592 * as we knew we were dealing with POSIX ACLs.
3593 * We no longer need to do so as we can guarentee
3594 * that a default ACL from the parent directory will
3595 * be well formed for POSIX ACLs if it came from a
3596 * POSIX ACL source, and if we're not writing to a
3597 * POSIX ACL sink then we don't care if it's not well
3598 * formed. JRA.
3599 */
3600
3601 num_aces += parent_sd->dacl->num_aces;
3602
3603 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3604 num_aces)) == NULL) {
3605 return NT_STATUS_NO_MEMORY;
3606 }
3607
3608 /* Start by copying in all the given ACE entries. */
3609 for (i = 0; i < psd->dacl->num_aces; i++) {
3610 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3611 }
3612
3613 /*
3614 * Note that we're ignoring "inherit permissions" here
3615 * as that really only applies to newly created files. JRA.
3616 */
3617
3618 /* Finally append any inherited ACEs. */
3619 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3620 struct security_ace *se = &parent_sd->dacl->aces[j];
3621
3622 if (fsp->is_directory) {
3623 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3624 /* Doesn't apply to a directory - ignore. */
3625 DEBUG(10,("append_parent_acl: directory %s "
3626 "ignoring non container "
3627 "inherit flags %u on ACE with sid %s "
3628 "from parent %s\n",
3629 fsp_str_dbg(fsp),
3630 (unsigned int)se->flags,
3631 sid_string_dbg(&se->trustee),
3632 parent_name));
3633 continue;
3634 }
3635 } else {
3636 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3637 /* Doesn't apply to a file - ignore. */
3638 DEBUG(10,("append_parent_acl: file %s "
3639 "ignoring non object "
3640 "inherit flags %u on ACE with sid %s "
3641 "from parent %s\n",
3642 fsp_str_dbg(fsp),
3643 (unsigned int)se->flags,
3644 sid_string_dbg(&se->trustee),
3645 parent_name));
3646 continue;
3647 }
3648 }
3649
3650 if (is_dacl_protected) {
3651 /* If the DACL is protected it means we must
3652 * not overwrite an existing ACE entry with the
3653 * same SID. This is order N^2. Ouch :-(. JRA. */
3654 unsigned int k;
3655 for (k = 0; k < psd->dacl->num_aces; k++) {
3656 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3657 &se->trustee)) {
3658 break;
3659 }
3660 }
3661 if (k < psd->dacl->num_aces) {
3662 /* SID matched. Ignore. */
3663 DEBUG(10,("append_parent_acl: path %s "
3664 "ignoring ACE with protected sid %s "
3665 "from parent %s\n",
3666 fsp_str_dbg(fsp),
3667 sid_string_dbg(&se->trustee),
3668 parent_name));
3669 continue;
3670 }
3671 }
3672
3673 sec_ace_copy(&new_ace[i], se);
3674 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3675 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3676 }
3677 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3678
3679 if (fsp->is_directory) {
3680 /*
3681 * Strip off any inherit only. It's applied.
3682 */
3683 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3684 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3685 /* No further inheritance. */
3686 new_ace[i].flags &=
3687 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3688 SEC_ACE_FLAG_OBJECT_INHERIT);
3689 }
3690 } else {
3691 /*
3692 * Strip off any container or inherit
3693 * flags, they can't apply to objects.
3694 */
3695 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3696 SEC_ACE_FLAG_INHERIT_ONLY|
3697 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3698 }
3699 i++;
3700
3701 DEBUG(10,("append_parent_acl: path %s "
3702 "inheriting ACE with sid %s "
3703 "from parent %s\n",
3704 fsp_str_dbg(fsp),
3705 sid_string_dbg(&se->trustee),
3706 parent_name));
3707 }
3708
3709 psd->dacl->aces = new_ace;
3710 psd->dacl->num_aces = i;
3711 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3712 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3713
3714 *pp_new_sd = psd;
3715 return status;
3716 }
3717 #endif
3718
3719 /****************************************************************************
3720 Reply to set a security descriptor on an fsp. security_info_sent is the
3721 description of the following NT ACL.
3722 This should be the only external function needed for the UNIX style set ACL.
3723 We make a copy of psd_orig as internal functions modify the elements inside
3724 it, even though it's a const pointer.
3725 ****************************************************************************/
3726
3727 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3728 {
3729 connection_struct *conn = fsp->conn;
3730 uid_t user = (uid_t)-1;
3731 gid_t grp = (gid_t)-1;
3732 struct dom_sid file_owner_sid;
3733 struct dom_sid file_grp_sid;
3734 canon_ace *file_ace_list = NULL;
3735 canon_ace *dir_ace_list = NULL;
3736 bool acl_perms = False;
3737 mode_t orig_mode = (mode_t)0;
3738 NTSTATUS status;
3739 bool set_acl_as_root = false;
3740 bool acl_set_support = false;
3741 bool ret = false;
3742 struct security_descriptor *psd = NULL;
3743
3744 DEBUG(10,("set_nt_acl: called for file %s\n",
3745 fsp_str_dbg(fsp)));
3746
3747 if (!CAN_WRITE(conn)) {
3748 DEBUG(10,("set acl rejected on read-only share\n"));
3749 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3750 }
3751
3752 if (!psd_orig) {
3753 return NT_STATUS_INVALID_PARAMETER;
3754 }
3755
3756 psd = dup_sec_desc(talloc_tos(), psd_orig);
3757 if (!psd) {
3758 return NT_STATUS_NO_MEMORY;
3759 }
3760
3761 /*
3762 * Get the current state of the file.
3763 */
3764
3765 status = vfs_stat_fsp(fsp);
3766 if (!NT_STATUS_IS_OK(status)) {
3767 return status;
3768 }
3769
3770 /* Save the original element we check against. */
3771 orig_mode = fsp->fsp_name->st.st_ex_mode;
3772
3773 /*
3774 * Unpack the user/group/world id's.
3775 */
3776
3777 /* POSIX can't cope with missing owner/group. */
3778 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3779 security_info_sent &= ~SECINFO_OWNER;
3780 }
3781 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3782 security_info_sent &= ~SECINFO_GROUP;
3783 }
3784
3785 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3786 if (!NT_STATUS_IS_OK(status)) {
3787 return status;
3788 }
3789
3790 /*
3791 * Do we need to chown ? If so this must be done first as the incoming
3792 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3793 * Noticed by Simo.
3794 */
3795
3796 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3797 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3798
3799 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3800 fsp_str_dbg(fsp), (unsigned int)user,
3801 (unsigned int)grp));
3802
3803 status = try_chown(fsp, user, grp);
3804 if(!NT_STATUS_IS_OK(status)) {
3805 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3806 "= %s.\n", fsp_str_dbg(fsp),
3807 (unsigned int)user,
3808 (unsigned int)grp,
3809 nt_errstr(status)));
3810 return status;
3811 }
3812
3813 /*
3814 * Recheck the current state of the file, which may have changed.
3815 * (suid/sgid bits, for instance)
3816 */
3817
3818 status = vfs_stat_fsp(fsp);
3819 if (!NT_STATUS_IS_OK(status)) {
3820 return status;
3821 }
3822
3823 /* Save the original element we check against. */
3824 orig_mode = fsp->fsp_name->st.st_ex_mode;
3825
3826 /* If we successfully chowned, we know we must
3827 * be able to set the acl, so do it as root.
3828 */
3829 set_acl_as_root = true;
3830 }
3831
3832 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3833
3834 if((security_info_sent & SECINFO_DACL) &&
3835 (psd->type & SEC_DESC_DACL_PRESENT) &&
3836 (psd->dacl == NULL)) {
3837 struct security_ace ace[3];
3838
3839 /* We can't have NULL DACL in POSIX.
3840 Use owner/group/Everyone -> full access. */
3841
3842 init_sec_ace(&ace[0],
3843 &file_owner_sid,
3844 SEC_ACE_TYPE_ACCESS_ALLOWED,
3845 GENERIC_ALL_ACCESS,
3846 0);
3847 init_sec_ace(&ace[1],
3848 &file_grp_sid,
3849 SEC_ACE_TYPE_ACCESS_ALLOWED,
3850 GENERIC_ALL_ACCESS,
3851 0);
3852 init_sec_ace(&ace[2],
3853 &global_sid_World,
3854 SEC_ACE_TYPE_ACCESS_ALLOWED,
3855 GENERIC_ALL_ACCESS,
3856 0);
3857 psd->dacl = make_sec_acl(talloc_tos(),
3858 NT4_ACL_REVISION,
3859 3,
3860 ace);
3861 if (psd->dacl == NULL) {
3862 return NT_STATUS_NO_MEMORY;
3863 }
3864 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3865 }
3866
3867 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3868 &file_grp_sid, &file_ace_list,
3869 &dir_ace_list, security_info_sent, psd);
3870
3871 /* Ignore W2K traverse DACL set. */
3872 if (!file_ace_list && !dir_ace_list) {
3873 return NT_STATUS_OK;
3874 }
3875
3876 if (!acl_perms) {
3877 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3878 free_canon_ace_list(file_ace_list);
3879 free_canon_ace_list(dir_ace_list);
3880 return NT_STATUS_ACCESS_DENIED;
3881 }
3882
3883 /*
3884 * Only change security if we got a DACL.
3885 */
3886
3887 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3888 free_canon_ace_list(file_ace_list);
3889 free_canon_ace_list(dir_ace_list);
3890 return NT_STATUS_OK;
3891 }
3892
3893 /*
3894 * Try using the POSIX ACL set first. Fall back to chmod if
3895 * we have no ACL support on this filesystem.
3896 */
3897
3898 if (acl_perms && file_ace_list) {
3899 if (set_acl_as_root) {
3900 become_root();
3901 }
3902 ret = set_canon_ace_list(fsp, file_ace_list, false,
3903 &fsp->fsp_name->st, &acl_set_support);
3904 if (set_acl_as_root) {
3905 unbecome_root();
3906 }
3907 if (acl_set_support && ret == false) {
3908 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3909 "%s (%s).\n", fsp_str_dbg(fsp),
3910 strerror(errno)));
3911 free_canon_ace_list(file_ace_list);
3912 free_canon_ace_list(dir_ace_list);
3913 return map_nt_error_from_unix(errno);
3914 }
3915 }
3916
3917 if (acl_perms && acl_set_support && fsp->is_directory) {
3918 if (dir_ace_list) {
3919 if (set_acl_as_root) {
3920 become_root();
3921 }
3922 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3923 &fsp->fsp_name->st,
3924 &acl_set_support);
3925 if (set_acl_as_root) {
3926 unbecome_root();
3927 }
3928 if (ret == false) {
3929 DEBUG(3,("set_nt_acl: failed to set default "
3930 "acl on directory %s (%s).\n",
3931 fsp_str_dbg(fsp), strerror(errno)));
3932 free_canon_ace_list(file_ace_list);
3933 free_canon_ace_list(dir_ace_list);
3934 return map_nt_error_from_unix(errno);
3935 }
3936 } else {
3937 int sret = -1;
3938
3939 /*
3940 * No default ACL - delete one if it exists.
3941 */
3942
3943 if (set_acl_as_root) {
3944 become_root();
3945 }
3946 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3947 fsp->fsp_name->base_name);
3948 if (set_acl_as_root) {
3949 unbecome_root();
3950 }
3951 if (sret == -1) {
3952 if (acl_group_override(conn, fsp->fsp_name)) {
3953 DEBUG(5,("set_nt_acl: acl group "
3954 "control on and current user "
3955 "in file %s primary group. "
3956 "Override delete_def_acl\n",
3957 fsp_str_dbg(fsp)));
3958
3959 become_root();
3960 sret =
3961 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3962 conn,
3963 fsp->fsp_name->base_name);
3964 unbecome_root();
3965 }
3966
3967 if (sret == -1) {
3968 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3969 free_canon_ace_list(file_ace_list);
3970 free_canon_ace_list(dir_ace_list);
3971 return map_nt_error_from_unix(errno);
3972 }
3973 }
3974 }
3975 }
3976
3977 if (acl_set_support) {
3978 if (set_acl_as_root) {
3979 become_root();
3980 }
3981 store_inheritance_attributes(fsp,
3982 file_ace_list,
3983 dir_ace_list,
3984 psd->type);
3985 if (set_acl_as_root) {
3986 unbecome_root();
3987 }
3988 }
3989
3990 /*
3991 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3992 */
3993
3994 if(!acl_set_support && acl_perms) {
3995 mode_t posix_perms;
3996
3997 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3998 free_canon_ace_list(file_ace_list);
3999 free_canon_ace_list(dir_ace_list);
4000 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4001 "posix permissions for file %s.\n",
4002 fsp_str_dbg(fsp)));
4003 return NT_STATUS_ACCESS_DENIED;
4004 }
4005
4006 if (orig_mode != posix_perms) {
4007 int sret = -1;
4008
4009 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4010 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4011
4012 if (set_acl_as_root) {
4013 become_root();
4014 }
4015 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4016 posix_perms);
4017 if (set_acl_as_root) {
4018 unbecome_root();
4019 }
4020 if(sret == -1) {
4021 if (acl_group_override(conn, fsp->fsp_name)) {
4022 DEBUG(5,("set_nt_acl: acl group "
4023 "control on and current user "
4024 "in file %s primary group. "
4025 "Override chmod\n",
4026 fsp_str_dbg(fsp)));
4027
4028 become_root();
4029 sret = SMB_VFS_CHMOD(conn,
4030 fsp->fsp_name->base_name,
4031 posix_perms);
4032 unbecome_root();
4033 }
4034
4035 if (sret == -1) {
4036 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4037 "failed. Error = %s.\n",
4038 fsp_str_dbg(fsp),
4039 (unsigned int)posix_perms,
4040 strerror(errno)));
4041 free_canon_ace_list(file_ace_list);
4042 free_canon_ace_list(dir_ace_list);
4043 return map_nt_error_from_unix(errno);
4044 }
4045 }
4046 }
4047 }
4048
4049 free_canon_ace_list(file_ace_list);
4050 free_canon_ace_list(dir_ace_list);
4051
4052 /* Ensure the stat struct in the fsp is correct. */
4053 status = vfs_stat_fsp(fsp);
4054
4055 return NT_STATUS_OK;
4056 }
4057
4058 /****************************************************************************
4059 Get the actual group bits stored on a file with an ACL. Has no effect if
4060 the file has no ACL. Needed in dosmode code where the stat() will return
4061 the mask bits, not the real group bits, for a file with an ACL.
4062 ****************************************************************************/
4063
4064 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4065 {
4066 int entry_id = SMB_ACL_FIRST_ENTRY;
4067 SMB_ACL_ENTRY_T entry;
4068 SMB_ACL_T posix_acl;
4069 int result = -1;
4070
4071 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4072 if (posix_acl == (SMB_ACL_T)NULL)
4073 return -1;
4074
4075 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4076 SMB_ACL_TAG_T tagtype;
4077 SMB_ACL_PERMSET_T permset;
4078
4079 entry_id = SMB_ACL_NEXT_ENTRY;
4080
4081 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4082 break;
4083
4084 if (tagtype == SMB_ACL_GROUP_OBJ) {
4085 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4086 break;
4087 } else {
4088 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4089 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4090 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4091 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4092 result = 0;
4093 break;
4094 }
4095 }
4096 }
4097 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4098 return result;
4099 }
4100
4101 /****************************************************************************
4102 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4103 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4104 ****************************************************************************/
4105
4106 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4107 {
4108 int entry_id = SMB_ACL_FIRST_ENTRY;
4109 SMB_ACL_ENTRY_T entry;
4110 int num_entries = 0;
4111
4112 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4113 SMB_ACL_TAG_T tagtype;
4114 SMB_ACL_PERMSET_T permset;
4115 mode_t perms;
4116
4117 entry_id = SMB_ACL_NEXT_ENTRY;
4118
4119 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4120 return -1;
4121
4122 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4123 return -1;
4124
4125 num_entries++;
4126
4127 switch(tagtype) {
4128 case SMB_ACL_USER_OBJ:
4129 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4130 break;
4131 case SMB_ACL_GROUP_OBJ:
4132 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4133 break;
4134 case SMB_ACL_MASK:
4135 /*
4136 * FIXME: The ACL_MASK entry permissions should really be set to
4137 * the union of the permissions of all ACL_USER,
4138 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4139 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4140 */
4141 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4142 break;
4143 case SMB_ACL_OTHER:
4144 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4145 break;
4146 default:
4147 continue;
4148 }
4149
4150 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4151 return -1;
4152
4153 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4154 return -1;
4155 }
4156
4157 /*
4158 * If this is a simple 3 element ACL or no elements then it's a standard
4159 * UNIX permission set. Just use chmod...
4160 */
4161
4162 if ((num_entries == 3) || (num_entries == 0))
4163 return -1;
4164
4165 return 0;
4166 }
4167
4168 /****************************************************************************
4169 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4170 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4171 resulting ACL on TO. Note that name is in UNIX character set.
4172 ****************************************************************************/
4173
4174 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4175 {
4176 SMB_ACL_T posix_acl = NULL;
4177 int ret = -1;
4178
4179 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4180 return -1;
4181
4182 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4183 goto done;
4184
4185 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4186
4187 done:
4188
4189 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4190 return ret;
4191 }
4192
4193 /****************************************************************************
4194 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4195 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4196 Note that name is in UNIX character set.
4197 ****************************************************************************/
4198
4199 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4200 {
4201 return copy_access_posix_acl(conn, name, name, mode);
4202 }
4203
4204 /****************************************************************************
4205 Check for an existing default POSIX ACL on a directory.
4206 ****************************************************************************/
4207
4208 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4209 {
4210 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4211 bool has_acl = False;
4212 SMB_ACL_ENTRY_T entry;
4213
4214 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4215 has_acl = True;
4216 }
4217
4218 if (def_acl) {
4219 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4220 }
4221 return has_acl;
4222 }
4223
4224 /****************************************************************************
4225 If the parent directory has no default ACL but it does have an Access ACL,
4226 inherit this Access ACL to file name.
4227 ****************************************************************************/
4228
4229 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4230 const char *name, mode_t mode)
4231 {
4232 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4233 return 0;
4234
4235 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4236 }
4237
4238 /****************************************************************************
4239 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4240 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4241 ****************************************************************************/
4242
4243 int fchmod_acl(files_struct *fsp, mode_t mode)
4244 {
4245 connection_struct *conn = fsp->conn;
4246 SMB_ACL_T posix_acl = NULL;
4247 int ret = -1;
4248
4249 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4250 return -1;
4251
4252 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4253 goto done;
4254
4255 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4256
4257 done:
4258
4259 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4260 return ret;
4261 }
4262
4263 /****************************************************************************
4264 Map from wire type to permset.
4265 ****************************************************************************/
4266
4267 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4268 {
4269 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4270 return False;
4271 }
4272
4273 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4274 return False;
4275 }
4276
4277 if (wire_perm & SMB_POSIX_ACL_READ) {
4278 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4279 return False;
4280 }
4281 }
4282 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4283 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4284 return False;
4285 }
4286 }
4287 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4288 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4289 return False;
4290 }
4291 }
4292 return True;
4293 }
4294
4295 /****************************************************************************
4296 Map from wire type to tagtype.
4297 ****************************************************************************/
4298
4299 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4300 {
4301 switch (wire_tt) {
4302 case SMB_POSIX_ACL_USER_OBJ:
4303 *p_tt = SMB_ACL_USER_OBJ;
4304 break;
4305 case SMB_POSIX_ACL_USER:
4306 *p_tt = SMB_ACL_USER;
4307 break;
4308 case SMB_POSIX_ACL_GROUP_OBJ:
4309 *p_tt = SMB_ACL_GROUP_OBJ;
4310 break;
4311 case SMB_POSIX_ACL_GROUP:
4312 *p_tt = SMB_ACL_GROUP;
4313 break;
4314 case SMB_POSIX_ACL_MASK:
4315 *p_tt = SMB_ACL_MASK;
4316 break;
4317 case SMB_POSIX_ACL_OTHER:
4318 *p_tt = SMB_ACL_OTHER;
4319 break;
4320 default:
4321 return False;
4322 }
4323 return True;
4324 }
4325
4326 /****************************************************************************
4327 Create a new POSIX acl from wire permissions.
4328 FIXME ! How does the share mask/mode fit into this.... ?
4329 ****************************************************************************/
4330
4331 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4332 {
4333 unsigned int i;
4334 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4335
4336 if (the_acl == NULL) {
4337 return NULL;
4338 }
4339
4340 for (i = 0; i < num_acls; i++) {
4341 SMB_ACL_ENTRY_T the_entry;
4342 SMB_ACL_PERMSET_T the_permset;
4343 SMB_ACL_TAG_T tag_type;
4344
4345 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4346 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4347 i, strerror(errno) ));
4348 goto fail;
4349 }
4350
4351 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4352 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4353 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4354 goto fail;
4355 }
4356
4357 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4358 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4359 i, strerror(errno) ));
4360 goto fail;
4361 }
4362
4363 /* Get the permset pointer from the new ACL entry. */
4364 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4365 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4366 i, strerror(errno) ));
4367 goto fail;
4368 }
4369
4370 /* Map from wire to permissions. */
4371 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4372 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4373 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4374 goto fail;
4375 }
4376
4377 /* Now apply to the new ACL entry. */
4378 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4379 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4380 i, strerror(errno) ));
4381 goto fail;
4382 }
4383
4384 if (tag_type == SMB_ACL_USER) {
4385 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4386 uid_t uid = (uid_t)uidval;
4387 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4388 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4389 (unsigned int)uid, i, strerror(errno) ));
4390 goto fail;
4391 }
4392 }
4393
4394 if (tag_type == SMB_ACL_GROUP) {
4395 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4396 gid_t gid = (uid_t)gidval;
4397 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4398 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4399 (unsigned int)gid, i, strerror(errno) ));
4400 goto fail;
4401 }
4402 }
4403 }
4404
4405 return the_acl;
4406
4407 fail:
4408
4409 if (the_acl != NULL) {
4410 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4411 }
4412 return NULL;
4413 }
4414
4415 /****************************************************************************
4416 Calls from UNIX extensions - Default POSIX ACL set.
4417 If num_def_acls == 0 and not a directory just return. If it is a directory
4418 and num_def_acls == 0 then remove the default acl. Else set the default acl
4419 on the directory.
4420 ****************************************************************************/
4421
4422 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4423 uint16 num_def_acls, const char *pdata)
4424 {
4425 SMB_ACL_T def_acl = NULL;
4426
4427 if (!S_ISDIR(psbuf->st_ex_mode)) {
4428 if (num_def_acls) {
4429 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4430 errno = EISDIR;
4431 return False;
4432 } else {
4433 return True;
4434 }
4435 }
4436
4437 if (!num_def_acls) {
4438 /* Remove the default ACL. */
4439 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4440 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4441 fname, strerror(errno) ));
4442 return False;
4443 }
4444 return True;
4445 }
4446
4447 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4448 return False;
4449 }
4450
4451 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4452 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4453 fname, strerror(errno) ));
4454 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4455 return False;
4456 }
4457
4458 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4459 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4460 return True;
4461 }
4462
4463 /****************************************************************************
4464 Remove an ACL from a file. As we don't have acl_delete_entry() available
4465 we must read the current acl and copy all entries except MASK, USER and GROUP
4466 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4467 removed.
4468 FIXME ! How does the share mask/mode fit into this.... ?
4469 ****************************************************************************/
4470
4471 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4472 {
4473 SMB_ACL_T file_acl = NULL;
4474 int entry_id = SMB_ACL_FIRST_ENTRY;
4475 SMB_ACL_ENTRY_T entry;
4476 bool ret = False;
4477 /* Create a new ACL with only 3 entries, u/g/w. */
4478 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4479 SMB_ACL_ENTRY_T user_ent = NULL;
4480 SMB_ACL_ENTRY_T group_ent = NULL;
4481 SMB_ACL_ENTRY_T other_ent = NULL;
4482
4483 if (new_file_acl == NULL) {
4484 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4485 return False;
4486 }
4487
4488 /* Now create the u/g/w entries. */
4489 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4490 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4491 fname, strerror(errno) ));
4492 goto done;
4493 }
4494 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4495 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4496 fname, strerror(errno) ));
4497 goto done;
4498 }
4499
4500 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4501 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4502 fname, strerror(errno) ));
4503 goto done;
4504 }
4505 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4506 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4507 fname, strerror(errno) ));
4508 goto done;
4509 }
4510
4511 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4512 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4513 fname, strerror(errno) ));
4514 goto done;
4515 }
4516 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4517 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4518 fname, strerror(errno) ));
4519 goto done;
4520 }
4521
4522 /* Get the current file ACL. */
4523 if (fsp && fsp->fh->fd != -1) {
4524 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4525 } else {
4526 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4527 }
4528
4529 if (file_acl == NULL) {
4530 /* This is only returned if an error occurred. Even for a file with
4531 no acl a u/g/w acl should be returned. */
4532 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4533 fname, strerror(errno) ));
4534 goto done;
4535 }
4536
4537 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4538 SMB_ACL_TAG_T tagtype;
4539 SMB_ACL_PERMSET_T permset;
4540
4541 entry_id = SMB_ACL_NEXT_ENTRY;
4542
4543 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4544 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4545 fname, strerror(errno) ));
4546 goto done;
4547 }
4548
4549 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4550 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4551 fname, strerror(errno) ));
4552 goto done;
4553 }
4554
4555 if (tagtype == SMB_ACL_USER_OBJ) {
4556 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4557 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4558 fname, strerror(errno) ));
4559 }
4560 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4561 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4562 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4563 fname, strerror(errno) ));
4564 }
4565 } else if (tagtype == SMB_ACL_OTHER) {
4566 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4567 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4568 fname, strerror(errno) ));
4569 }
4570 }
4571 }
4572
4573 /* Set the new empty file ACL. */
4574 if (fsp && fsp->fh->fd != -1) {
4575 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4576 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4577 fname, strerror(errno) ));
4578 goto done;
4579 }
4580 } else {
4581 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4582 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4583 fname, strerror(errno) ));
4584 goto done;
4585 }
4586 }
4587
4588 ret = True;
4589
4590 done:
4591
4592 if (file_acl) {
4593 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4594 }
4595 if (new_file_acl) {
4596 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4597 }
4598 return ret;
4599 }
4600
4601 /****************************************************************************
4602 Calls from UNIX extensions - POSIX ACL set.
4603 If num_def_acls == 0 then read/modify/write acl after removing all entries
4604 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4605 ****************************************************************************/
4606
4607 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4608 {
4609 SMB_ACL_T file_acl = NULL;
4610
4611 if (!num_acls) {
4612 /* Remove the ACL from the file. */
4613 return remove_posix_acl(conn, fsp, fname);
4614 }
4615
4616 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4617 return False;
4618 }
4619
4620 if (fsp && fsp->fh->fd != -1) {
4621 /* The preferred way - use an open fd. */
4622 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4623 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4624 fname, strerror(errno) ));
4625 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4626 return False;
4627 }
4628 } else {
4629 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4630 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4631 fname, strerror(errno) ));
4632 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4633 return False;
4634 }
4635 }
4636
4637 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4638 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4639 return True;
4640 }
4641
4642 /********************************************************************
4643 Pull the NT ACL from a file on disk or the OpenEventlog() access
4644 check. Caller is responsible for freeing the returned security
4645 descriptor via TALLOC_FREE(). This is designed for dealing with
4646 user space access checks in smbd outside of the VFS. For example,
4647 checking access rights in OpenEventlog().
4648
4649 Assume we are dealing with files (for now)
4650 ********************************************************************/
4651
4652 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4653 {
4654 struct security_descriptor *psd, *ret_sd;
4655 connection_struct *conn;
4656 files_struct finfo;
4657 struct fd_handle fh;
4658 NTSTATUS status;
4659
4660 conn = talloc_zero(ctx, connection_struct);
4661 if (conn == NULL) {
4662 DEBUG(0, ("talloc failed\n"));
4663 return NULL;
4664 }
4665
4666 if (!(conn->params = talloc(conn, struct share_params))) {
4667 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4668 TALLOC_FREE(conn);
4669 return NULL;
4670 }
4671
4672 conn->params->service = -1;
4673
4674 set_conn_connectpath(conn, "/");
4675
4676 if (!smbd_vfs_init(conn)) {
4677 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4678 conn_free(conn);
4679 return NULL;
4680 }
4681
4682 ZERO_STRUCT( finfo );
4683 ZERO_STRUCT( fh );
4684
4685 finfo.fnum = -1;
4686 finfo.conn = conn;
4687 finfo.fh = &fh;
4688 finfo.fh->fd = -1;
4689
4690 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4691 &finfo.fsp_name);
4692 if (!NT_STATUS_IS_OK(status)) {
4693 conn_free(conn);
4694 return NULL;
4695 }
4696
4697 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4698 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4699 TALLOC_FREE(finfo.fsp_name);
4700 conn_free(conn);
4701 return NULL;
4702 }
4703
4704 ret_sd = dup_sec_desc( ctx, psd );
4705
4706 TALLOC_FREE(finfo.fsp_name);
4707 conn_free(conn);
4708
4709 return ret_sd;
4710 }
4711
4712 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4713
4714 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4715 const char *name,
4716 SMB_STRUCT_STAT *psbuf,
4717 struct security_descriptor **ppdesc)
4718 {
4719 struct dom_sid owner_sid, group_sid;
4720 size_t size = 0;
4721 struct security_ace aces[4];
4722 uint32_t access_mask = 0;
4723 mode_t mode = psbuf->st_ex_mode;
4724 struct security_acl *new_dacl = NULL;
4725 int idx = 0;
4726
4727 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4728 name, (int)mode ));
4729
4730 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4731 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4732
4733 /*
4734 We provide up to 4 ACEs
4735 - Owner
4736 - Group
4737 - Everyone
4738 - NT System
4739 */
4740
4741 if (mode & S_IRUSR) {
4742 if (mode & S_IWUSR) {
4743 access_mask |= SEC_RIGHTS_FILE_ALL;
4744 } else {
4745 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4746 }
4747 }
4748 if (mode & S_IWUSR) {
4749 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4750 }
4751
4752 init_sec_ace(&aces[idx],
4753 &owner_sid,
4754 SEC_ACE_TYPE_ACCESS_ALLOWED,
4755 access_mask,
4756 0);
4757 idx++;
4758
4759 access_mask = 0;
4760 if (mode & S_IRGRP) {
4761 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4762 }
4763 if (mode & S_IWGRP) {
4764 /* note that delete is not granted - this matches posix behaviour */
4765 access_mask |= SEC_RIGHTS_FILE_WRITE;
4766 }
4767 if (access_mask) {
4768 init_sec_ace(&aces[idx],
4769 &group_sid,
4770 SEC_ACE_TYPE_ACCESS_ALLOWED,
4771 access_mask,
4772 0);
4773 idx++;
4774 }
4775
4776 access_mask = 0;
4777 if (mode & S_IROTH) {
4778 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4779 }
4780 if (mode & S_IWOTH) {
4781 access_mask |= SEC_RIGHTS_FILE_WRITE;
4782 }
4783 if (access_mask) {
4784 init_sec_ace(&aces[idx],
4785 &global_sid_World,
4786 SEC_ACE_TYPE_ACCESS_ALLOWED,
4787 access_mask,
4788 0);
4789 idx++;
4790 }
4791
4792 init_sec_ace(&aces[idx],
4793 &global_sid_System,
4794 SEC_ACE_TYPE_ACCESS_ALLOWED,
4795 SEC_RIGHTS_FILE_ALL,
4796 0);
4797 idx++;
4798
4799 new_dacl = make_sec_acl(ctx,
4800 NT4_ACL_REVISION,
4801 idx,
4802 aces);
4803
4804 if (!new_dacl) {
4805 return NT_STATUS_NO_MEMORY;
4806 }
4807
4808 *ppdesc = make_sec_desc(ctx,
4809 SECURITY_DESCRIPTOR_REVISION_1,
4810 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4811 &owner_sid,
4812 &group_sid,
4813 NULL,
4814 new_dacl,
4815 &size);
4816 if (!*ppdesc) {
4817 return NT_STATUS_NO_MEMORY;
4818 }
4819 return NT_STATUS_OK;
4820 }
reg import