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tevent: call epoll_panic() if EPOLL_CTL_DEL failed
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobfbeb66264c68fcb878bbe590e4e57aa414be2ad7
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 #include "../librpc/gen_ndr/idmap.h"
30 #include "../librpc/gen_ndr/ndr_smb_acl.h"
31 #include "lib/param/loadparm.h"
32
33 extern const struct generic_mapping file_generic_mapping;
34
35 #undef DBGC_CLASS
36 #define DBGC_CLASS DBGC_ACLS
37
38 /****************************************************************************
39 Data structures representing the internal ACE format.
40 ****************************************************************************/
41
42 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
43 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
44
45 typedef struct canon_ace {
46 struct canon_ace *next, *prev;
47 SMB_ACL_TAG_T type;
48 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
49 struct dom_sid trustee;
50 enum ace_owner owner_type;
51 enum ace_attribute attr;
52 struct unixid unix_ug;
53 uint8_t ace_flags; /* From windows ACE entry. */
54 } canon_ace;
55
56 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
57
58 /*
59 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
60 * attribute on disk - version 1.
61 * All values are little endian.
62 *
63 * | 1 | 1 | 2 | 2 | ....
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
66 * +------+------+-------------+---------------------+-------------+--------------------+
67 *
68 * Entry format is :
69 *
70 * | 1 | 4 |
71 * +------+-------------------+
72 * | value| uid/gid or world |
73 * | type | value |
74 * +------+-------------------+
75 *
76 * Version 2 format. Stores extra Windows metadata about an ACL.
77 *
78 * | 1 | 2 | 2 | 2 | ....
79 * +------+----------+-------------+---------------------+-------------+--------------------+
80 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
81 * | 2 | type | | | | |
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 *
84 * Entry format is :
85 *
86 * | 1 | 1 | 4 |
87 * +------+------+-------------------+
88 * | ace | value| uid/gid or world |
89 * | flag | type | value |
90 * +------+-------------------+------+
91 *
92 */
93
94 #define PAI_VERSION_OFFSET 0
95
96 #define PAI_V1_FLAG_OFFSET 1
97 #define PAI_V1_NUM_ENTRIES_OFFSET 2
98 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
99 #define PAI_V1_ENTRIES_BASE 6
100 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
101 #define PAI_V1_ENTRY_LENGTH 5
102
103 #define PAI_V1_VERSION 1
104
105 #define PAI_V2_TYPE_OFFSET 1
106 #define PAI_V2_NUM_ENTRIES_OFFSET 3
107 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
108 #define PAI_V2_ENTRIES_BASE 7
109 #define PAI_V2_ENTRY_LENGTH 6
110
111 #define PAI_V2_VERSION 2
112
113 /*
114 * In memory format of user.SAMBA_PAI attribute.
115 */
116
117 struct pai_entry {
118 struct pai_entry *next, *prev;
119 uint8_t ace_flags;
120 enum ace_owner owner_type;
121 struct unixid unix_ug;
122 };
123
124 struct pai_val {
125 uint16_t sd_type;
126 unsigned int num_entries;
127 struct pai_entry *entry_list;
128 unsigned int num_def_entries;
129 struct pai_entry *def_entry_list;
130 };
131
132 /************************************************************************
133 Return a uint32 of the pai_entry principal.
134 ************************************************************************/
135
136 static uint32_t get_pai_entry_val(struct pai_entry *paie)
137 {
138 switch (paie->owner_type) {
139 case UID_ACE:
140 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
141 return (uint32_t)paie->unix_ug.id;
142 case GID_ACE:
143 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
144 return (uint32_t)paie->unix_ug.id;
145 case WORLD_ACE:
146 default:
147 DEBUG(10,("get_pai_entry_val: world ace\n"));
148 return (uint32_t)-1;
149 }
150 }
151
152 /************************************************************************
153 Return a uint32 of the entry principal.
154 ************************************************************************/
155
156 static uint32_t get_entry_val(canon_ace *ace_entry)
157 {
158 switch (ace_entry->owner_type) {
159 case UID_ACE:
160 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
161 return (uint32_t)ace_entry->unix_ug.id;
162 case GID_ACE:
163 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
164 return (uint32_t)ace_entry->unix_ug.id;
165 case WORLD_ACE:
166 default:
167 DEBUG(10,("get_entry_val: world ace\n"));
168 return (uint32_t)-1;
169 }
170 }
171
172 /************************************************************************
173 Create the on-disk format (always v2 now). Caller must free.
174 ************************************************************************/
175
176 static char *create_pai_buf_v2(canon_ace *file_ace_list,
177 canon_ace *dir_ace_list,
178 uint16_t sd_type,
179 size_t *store_size)
180 {
181 char *pai_buf = NULL;
182 canon_ace *ace_list = NULL;
183 char *entry_offset = NULL;
184 unsigned int num_entries = 0;
185 unsigned int num_def_entries = 0;
186 unsigned int i;
187
188 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
189 num_entries++;
190 }
191
192 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
193 num_def_entries++;
194 }
195
196 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
197
198 *store_size = PAI_V2_ENTRIES_BASE +
199 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
200
201 pai_buf = talloc_array(talloc_tos(), char, *store_size);
202 if (!pai_buf) {
203 return NULL;
204 }
205
206 /* Set up the header. */
207 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
208 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
209 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
210 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
211 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
212
213 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
214 (unsigned int)sd_type ));
215
216 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
217
218 i = 0;
219 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
220 uint8_t type_val = (uint8_t)ace_list->owner_type;
221 uint32_t entry_val = get_entry_val(ace_list);
222
223 SCVAL(entry_offset,0,ace_list->ace_flags);
224 SCVAL(entry_offset,1,type_val);
225 SIVAL(entry_offset,2,entry_val);
226 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
227 i,
228 (unsigned int)ace_list->ace_flags,
229 (unsigned int)type_val,
230 (unsigned int)entry_val ));
231 i++;
232 entry_offset += PAI_V2_ENTRY_LENGTH;
233 }
234
235 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
236 uint8_t type_val = (uint8_t)ace_list->owner_type;
237 uint32_t entry_val = get_entry_val(ace_list);
238
239 SCVAL(entry_offset,0,ace_list->ace_flags);
240 SCVAL(entry_offset,1,type_val);
241 SIVAL(entry_offset,2,entry_val);
242 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
243 i,
244 (unsigned int)ace_list->ace_flags,
245 (unsigned int)type_val,
246 (unsigned int)entry_val ));
247 i++;
248 entry_offset += PAI_V2_ENTRY_LENGTH;
249 }
250
251 return pai_buf;
252 }
253
254 /************************************************************************
255 Store the user.SAMBA_PAI attribute on disk.
256 ************************************************************************/
257
258 static void store_inheritance_attributes(files_struct *fsp,
259 canon_ace *file_ace_list,
260 canon_ace *dir_ace_list,
261 uint16_t sd_type)
262 {
263 int ret;
264 size_t store_size;
265 char *pai_buf;
266
267 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
268 return;
269 }
270
271 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
272 sd_type, &store_size);
273
274 if (fsp->fh->fd != -1) {
275 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
276 pai_buf, store_size, 0);
277 } else {
278 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
279 SAMBA_POSIX_INHERITANCE_EA_NAME,
280 pai_buf, store_size, 0);
281 }
282
283 TALLOC_FREE(pai_buf);
284
285 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
286 (unsigned int)sd_type,
287 fsp_str_dbg(fsp)));
288
289 if (ret == -1 && !no_acl_syscall_error(errno)) {
290 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
291 }
292 }
293
294 /************************************************************************
295 Delete the in memory inheritance info.
296 ************************************************************************/
297
298 static void free_inherited_info(struct pai_val *pal)
299 {
300 if (pal) {
301 struct pai_entry *paie, *paie_next;
302 for (paie = pal->entry_list; paie; paie = paie_next) {
303 paie_next = paie->next;
304 TALLOC_FREE(paie);
305 }
306 for (paie = pal->def_entry_list; paie; paie = paie_next) {
307 paie_next = paie->next;
308 TALLOC_FREE(paie);
309 }
310 TALLOC_FREE(pal);
311 }
312 }
313
314 /************************************************************************
315 Get any stored ACE flags.
316 ************************************************************************/
317
318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
319 {
320 struct pai_entry *paie;
321
322 if (!pal) {
323 return 0;
324 }
325
326 /* If the entry exists it is inherited. */
327 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
328 if (ace_entry->owner_type == paie->owner_type &&
329 get_entry_val(ace_entry) == get_pai_entry_val(paie))
330 return paie->ace_flags;
331 }
332 return 0;
333 }
334
335 /************************************************************************
336 Ensure an attribute just read is valid - v1.
337 ************************************************************************/
338
339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
340 {
341 uint16 num_entries;
342 uint16 num_def_entries;
343
344 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
345 /* Corrupted - too small. */
346 return false;
347 }
348
349 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
350 return false;
351 }
352
353 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
354 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
355
356 /* Check the entry lists match. */
357 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
358
359 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
360 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
361 return false;
362 }
363
364 return true;
365 }
366
367 /************************************************************************
368 Ensure an attribute just read is valid - v2.
369 ************************************************************************/
370
371 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
372 {
373 uint16 num_entries;
374 uint16 num_def_entries;
375
376 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
377 /* Corrupted - too small. */
378 return false;
379 }
380
381 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
382 return false;
383 }
384
385 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
386 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
387
388 /* Check the entry lists match. */
389 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
390
391 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
392 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
393 return false;
394 }
395
396 return true;
397 }
398
399 /************************************************************************
400 Decode the owner.
401 ************************************************************************/
402
403 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
404 {
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.type = ID_TYPE_UID;
409 paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
410 DEBUG(10,("get_pai_owner_type: uid = %u\n",
411 (unsigned int)paie->unix_ug.id ));
412 break;
413 case GID_ACE:
414 paie->unix_ug.type = ID_TYPE_GID;
415 paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
416 DEBUG(10,("get_pai_owner_type: gid = %u\n",
417 (unsigned int)paie->unix_ug.id ));
418 break;
419 case WORLD_ACE:
420 paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
421 paie->unix_ug.id = -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.id);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.id);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, 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(SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (sys_acl_get_perm(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 (sys_acl_clear_perms(*p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (sys_acl_add_perm(*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 UID or GID - 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 * For the IDMAP_BOTH case, we must not merge
955 * the UID and GID ACE values for same SID
956 */
957
958 if (!dir_acl) {
959 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
960 curr_ace->owner_type == curr_ace_outer->owner_type &&
961 (curr_ace->attr == curr_ace_outer->attr));
962 } else {
963 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
964 curr_ace->owner_type == curr_ace_outer->owner_type &&
965 (curr_ace->type == curr_ace_outer->type) &&
966 (curr_ace->attr == curr_ace_outer->attr));
967 }
968
969 if (can_merge) {
970 if( DEBUGLVL( 10 )) {
971 dbgtext("merge_aces: Merging ACE's\n");
972 print_canon_ace( curr_ace_outer, 0);
973 print_canon_ace( curr_ace, 0);
974 }
975
976 /* Merge two allow or two deny ACE's. */
977
978 /* Theoretically we shouldn't merge a dir ACE if
979 * one ACE has the CI flag set, and the other
980 * ACE has the OI flag set, but this is rare
981 * enough we can ignore it. */
982
983 curr_ace_outer->perms |= curr_ace->perms;
984 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
985 DLIST_REMOVE(l_head, curr_ace);
986 TALLOC_FREE(curr_ace);
987 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
988 }
989 }
990 }
991
992 /*
993 * Now go through and mask off allow permissions with deny permissions.
994 * We can delete either the allow or deny here as we know that each SID
995 * appears only once in the list.
996 */
997
998 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
999 canon_ace *curr_ace;
1000 canon_ace *curr_ace_next;
1001
1002 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1003
1004 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1005
1006 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1007
1008 /*
1009 * Subtract ACE's with different entries. Due to the ordering constraints
1010 * we've put on the ACL, we know the deny must be the first one.
1011 */
1012
1013 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1014 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1015 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1016
1017 if( DEBUGLVL( 10 )) {
1018 dbgtext("merge_aces: Masking ACE's\n");
1019 print_canon_ace( curr_ace_outer, 0);
1020 print_canon_ace( curr_ace, 0);
1021 }
1022
1023 curr_ace->perms &= ~curr_ace_outer->perms;
1024
1025 if (curr_ace->perms == 0) {
1026
1027 /*
1028 * The deny overrides the allow. Remove the allow.
1029 */
1030
1031 DLIST_REMOVE(l_head, curr_ace);
1032 TALLOC_FREE(curr_ace);
1033 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1034
1035 } else {
1036
1037 /*
1038 * Even after removing permissions, there
1039 * are still allow permissions - delete the deny.
1040 * It is safe to delete the deny here,
1041 * as we are guarenteed by the deny first
1042 * ordering that all the deny entries for
1043 * this SID have already been merged into one
1044 * before we can get to an allow ace.
1045 */
1046
1047 DLIST_REMOVE(l_head, curr_ace_outer);
1048 TALLOC_FREE(curr_ace_outer);
1049 break;
1050 }
1051 }
1052
1053 } /* end for curr_ace */
1054 } /* end for curr_ace_outer */
1055
1056 /* We may have modified the list. */
1057
1058 *pp_list_head = l_head;
1059 }
1060
1061 /****************************************************************************
1062 Map canon_ace perms to permission bits NT.
1063 The attr element is not used here - we only process deny entries on set,
1064 not get. Deny entries are implicit on get with ace->perms = 0.
1065 ****************************************************************************/
1066
1067 uint32_t map_canon_ace_perms(int snum,
1068 enum security_ace_type *pacl_type,
1069 mode_t perms,
1070 bool directory_ace)
1071 {
1072 uint32_t nt_mask = 0;
1073
1074 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1075
1076 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1077 if (directory_ace) {
1078 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1079 } else {
1080 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1081 }
1082 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1083 /*
1084 * Windows NT refuses to display ACEs with no permissions in them (but
1085 * they are perfectly legal with Windows 2000). If the ACE has empty
1086 * permissions we cannot use 0, so we use the otherwise unused
1087 * WRITE_OWNER permission, which we ignore when we set an ACL.
1088 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1089 * to be changed in the future.
1090 */
1091
1092 nt_mask = 0;
1093 } else {
1094 if (directory_ace) {
1095 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1096 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1097 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1098 } else {
1099 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1100 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1101 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1102 }
1103 }
1104
1105 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1106 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1107 }
1108
1109 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1110 (unsigned int)perms, (unsigned int)nt_mask ));
1111
1112 return nt_mask;
1113 }
1114
1115 /****************************************************************************
1116 Map NT perms to a UNIX mode_t.
1117 ****************************************************************************/
1118
1119 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1120 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1121 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1122
1123 static mode_t map_nt_perms( uint32 *mask, int type)
1124 {
1125 mode_t mode = 0;
1126
1127 switch(type) {
1128 case S_IRUSR:
1129 if((*mask) & GENERIC_ALL_ACCESS)
1130 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1131 else {
1132 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1133 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1134 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1135 }
1136 break;
1137 case S_IRGRP:
1138 if((*mask) & GENERIC_ALL_ACCESS)
1139 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1140 else {
1141 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1142 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1143 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1144 }
1145 break;
1146 case S_IROTH:
1147 if((*mask) & GENERIC_ALL_ACCESS)
1148 mode = S_IROTH|S_IWOTH|S_IXOTH;
1149 else {
1150 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1151 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1152 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1153 }
1154 break;
1155 }
1156
1157 return mode;
1158 }
1159
1160 /****************************************************************************
1161 Unpack a struct security_descriptor into a UNIX owner and group.
1162 ****************************************************************************/
1163
1164 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1165 uid_t *puser, gid_t *pgrp,
1166 uint32 security_info_sent, const struct
1167 security_descriptor *psd)
1168 {
1169 struct dom_sid owner_sid;
1170 struct dom_sid grp_sid;
1171
1172 *puser = (uid_t)-1;
1173 *pgrp = (gid_t)-1;
1174
1175 if(security_info_sent == 0) {
1176 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1177 return NT_STATUS_OK;
1178 }
1179
1180 /*
1181 * Validate the owner and group SID's.
1182 */
1183
1184 memset(&owner_sid, '\0', sizeof(owner_sid));
1185 memset(&grp_sid, '\0', sizeof(grp_sid));
1186
1187 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1188
1189 /*
1190 * Don't immediately fail if the owner sid cannot be validated.
1191 * This may be a group chown only set.
1192 */
1193
1194 if (security_info_sent & SECINFO_OWNER) {
1195 sid_copy(&owner_sid, psd->owner_sid);
1196 if (!sid_to_uid(&owner_sid, puser)) {
1197 if (lp_force_unknown_acl_user(SNUM(conn))) {
1198 /* this allows take ownership to work
1199 * reasonably */
1200 *puser = get_current_uid(conn);
1201 } else {
1202 DEBUG(3,("unpack_nt_owners: unable to validate"
1203 " owner sid for %s\n",
1204 sid_string_dbg(&owner_sid)));
1205 return NT_STATUS_INVALID_OWNER;
1206 }
1207 }
1208 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1209 (unsigned int)*puser ));
1210 }
1211
1212 /*
1213 * Don't immediately fail if the group sid cannot be validated.
1214 * This may be an owner chown only set.
1215 */
1216
1217 if (security_info_sent & SECINFO_GROUP) {
1218 sid_copy(&grp_sid, psd->group_sid);
1219 if (!sid_to_gid( &grp_sid, pgrp)) {
1220 if (lp_force_unknown_acl_user(SNUM(conn))) {
1221 /* this allows take group ownership to work
1222 * reasonably */
1223 *pgrp = get_current_gid(conn);
1224 } else {
1225 DEBUG(3,("unpack_nt_owners: unable to validate"
1226 " group sid.\n"));
1227 return NT_STATUS_INVALID_OWNER;
1228 }
1229 }
1230 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1231 (unsigned int)*pgrp));
1232 }
1233
1234 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1235
1236 return NT_STATUS_OK;
1237 }
1238
1239
1240 static void trim_ace_perms(canon_ace *pace)
1241 {
1242 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1243 }
1244
1245 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1246 canon_ace *pace)
1247 {
1248 pace->perms |= S_IRUSR;
1249 if (is_directory) {
1250 pace->perms |= (S_IWUSR|S_IXUSR);
1251 }
1252 }
1253
1254 /****************************************************************************
1255 Check if a given uid/SID is in a group gid/SID. This is probably very
1256 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1257 ****************************************************************************/
1258
1259 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1260 {
1261 /* "Everyone" always matches every uid. */
1262
1263 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1264 return True;
1265
1266 /*
1267 * if it's the current user, we already have the unix token
1268 * and don't need to do the complex user_in_group_sid() call
1269 */
1270 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1271 const struct security_unix_token *curr_utok = NULL;
1272 size_t i;
1273
1274 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1275 return True;
1276 }
1277
1278 curr_utok = get_current_utok(conn);
1279 for (i=0; i < curr_utok->ngroups; i++) {
1280 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1281 return True;
1282 }
1283 }
1284 }
1285
1286 /*
1287 * user_in_group_sid() uses create_token_from_sid()
1288 * which creates an artificial NT token given just a username,
1289 * so this is not reliable for users from foreign domains
1290 * exported by winbindd!
1291 */
1292 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1293 }
1294
1295 /****************************************************************************
1296 A well formed POSIX file or default ACL has at least 3 entries, a
1297 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1298 In addition, the owner must always have at least read access.
1299 When using this call on get_acl, the pst struct is valid and contains
1300 the mode of the file.
1301 ****************************************************************************/
1302
1303 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1304 canon_ace **pp_ace,
1305 const struct dom_sid *pfile_owner_sid,
1306 const struct dom_sid *pfile_grp_sid,
1307 const SMB_STRUCT_STAT *pst)
1308 {
1309 canon_ace *pace;
1310 bool got_user = false;
1311 bool got_group = false;
1312 bool got_other = false;
1313
1314 for (pace = *pp_ace; pace; pace = pace->next) {
1315 if (pace->type == SMB_ACL_USER_OBJ) {
1316 got_user = true;
1317 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1318 got_group = true;
1319 } else if (pace->type == SMB_ACL_OTHER) {
1320 got_other = true;
1321 }
1322 }
1323
1324 if (!got_user) {
1325 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1326 DEBUG(0,("malloc fail.\n"));
1327 return false;
1328 }
1329
1330 ZERO_STRUCTP(pace);
1331 pace->type = SMB_ACL_USER_OBJ;
1332 pace->owner_type = UID_ACE;
1333 pace->unix_ug.type = ID_TYPE_UID;
1334 pace->unix_ug.id = pst->st_ex_uid;
1335 pace->trustee = *pfile_owner_sid;
1336 pace->attr = ALLOW_ACE;
1337 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1338 DLIST_ADD(*pp_ace, pace);
1339 }
1340
1341 if (!got_group) {
1342 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1343 DEBUG(0,("malloc fail.\n"));
1344 return false;
1345 }
1346
1347 ZERO_STRUCTP(pace);
1348 pace->type = SMB_ACL_GROUP_OBJ;
1349 pace->owner_type = GID_ACE;
1350 pace->unix_ug.type = ID_TYPE_GID;
1351 pace->unix_ug.id = pst->st_ex_gid;
1352 pace->trustee = *pfile_grp_sid;
1353 pace->attr = ALLOW_ACE;
1354 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1355 DLIST_ADD(*pp_ace, pace);
1356 }
1357
1358 if (!got_other) {
1359 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1360 DEBUG(0,("malloc fail.\n"));
1361 return false;
1362 }
1363
1364 ZERO_STRUCTP(pace);
1365 pace->type = SMB_ACL_OTHER;
1366 pace->owner_type = WORLD_ACE;
1367 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1368 pace->unix_ug.id = -1;
1369 pace->trustee = global_sid_World;
1370 pace->attr = ALLOW_ACE;
1371 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1372 DLIST_ADD(*pp_ace, pace);
1373 }
1374
1375 return true;
1376 }
1377
1378 /****************************************************************************
1379 A well formed POSIX file or default ACL has at least 3 entries, a
1380 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1381 In addition, the owner must always have at least read access.
1382 When using this call on set_acl, the pst struct has
1383 been modified to have a mode containing the default for this file or directory
1384 type.
1385 ****************************************************************************/
1386
1387 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1388 canon_ace **pp_ace,
1389 bool is_default_acl,
1390 const struct share_params *params,
1391 const bool is_directory,
1392 const struct dom_sid *pfile_owner_sid,
1393 const struct dom_sid *pfile_grp_sid,
1394 const SMB_STRUCT_STAT *pst)
1395 {
1396 canon_ace *pace;
1397 canon_ace *pace_user = NULL;
1398 canon_ace *pace_group = NULL;
1399 canon_ace *pace_other = NULL;
1400 bool got_duplicate_user = false;
1401 bool got_duplicate_group = false;
1402
1403 for (pace = *pp_ace; pace; pace = pace->next) {
1404 trim_ace_perms(pace);
1405 if (pace->type == SMB_ACL_USER_OBJ) {
1406 ensure_minimal_owner_ace_perms(is_directory, pace);
1407 pace_user = pace;
1408 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1409 pace_group = pace;
1410 } else if (pace->type == SMB_ACL_OTHER) {
1411 pace_other = pace;
1412 }
1413 }
1414
1415 if (!pace_user) {
1416 canon_ace *pace_iter;
1417
1418 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1419 DEBUG(0,("talloc fail.\n"));
1420 return false;
1421 }
1422
1423 ZERO_STRUCTP(pace);
1424 pace->type = SMB_ACL_USER_OBJ;
1425 pace->owner_type = UID_ACE;
1426 pace->unix_ug.type = ID_TYPE_UID;
1427 pace->unix_ug.id = pst->st_ex_uid;
1428 pace->trustee = *pfile_owner_sid;
1429 pace->attr = ALLOW_ACE;
1430 /* Start with existing user permissions, principle of least
1431 surprises for the user. */
1432 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1433
1434 /* See if the owning user is in any of the other groups in
1435 the ACE, or if there's a matching user entry (by uid
1436 or in the case of ID_TYPE_BOTH by SID).
1437 If so, OR in the permissions from that entry. */
1438
1439
1440 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1441 if (pace_iter->type == SMB_ACL_USER &&
1442 pace_iter->unix_ug.id == pace->unix_ug.id) {
1443 pace->perms |= pace_iter->perms;
1444 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1445 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1446 pace->perms |= pace_iter->perms;
1447 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1448 pace->perms |= pace_iter->perms;
1449 }
1450 }
1451 }
1452
1453 if (pace->perms == 0) {
1454 /* If we only got an "everyone" perm, just use that. */
1455 if (pace_other)
1456 pace->perms = pace_other->perms;
1457 }
1458
1459 /*
1460 * Ensure we have default parameters for the
1461 * user (owner) even on default ACLs.
1462 */
1463 ensure_minimal_owner_ace_perms(is_directory, pace);
1464
1465 DLIST_ADD(*pp_ace, pace);
1466 pace_user = pace;
1467 }
1468
1469 if (!pace_group) {
1470 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1471 DEBUG(0,("talloc fail.\n"));
1472 return false;
1473 }
1474
1475 ZERO_STRUCTP(pace);
1476 pace->type = SMB_ACL_GROUP_OBJ;
1477 pace->owner_type = GID_ACE;
1478 pace->unix_ug.type = ID_TYPE_GID;
1479 pace->unix_ug.id = pst->st_ex_gid;
1480 pace->trustee = *pfile_grp_sid;
1481 pace->attr = ALLOW_ACE;
1482
1483 /* If we only got an "everyone" perm, just use that. */
1484 if (pace_other) {
1485 pace->perms = pace_other->perms;
1486 } else {
1487 pace->perms = 0;
1488 }
1489
1490 DLIST_ADD(*pp_ace, pace);
1491 pace_group = pace;
1492 }
1493
1494 if (!pace_other) {
1495 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1496 DEBUG(0,("talloc fail.\n"));
1497 return false;
1498 }
1499
1500 ZERO_STRUCTP(pace);
1501 pace->type = SMB_ACL_OTHER;
1502 pace->owner_type = WORLD_ACE;
1503 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1504 pace->unix_ug.id = -1;
1505 pace->trustee = global_sid_World;
1506 pace->attr = ALLOW_ACE;
1507 pace->perms = 0;
1508
1509 DLIST_ADD(*pp_ace, pace);
1510 pace_other = pace;
1511 }
1512
1513 /* Ensure when setting a POSIX ACL, that the uid for a
1514 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1515 permission entry as an SMB_ACL_USER, and a gid for a
1516 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1517 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1518 then if the ownership or group ownership of this file or
1519 directory gets changed, the user or group can lose their
1520 access. */
1521
1522 for (pace = *pp_ace; pace; pace = pace->next) {
1523 if (pace->type == SMB_ACL_USER &&
1524 pace->unix_ug.id == pace_user->unix_ug.id) {
1525 /* Already got one. */
1526 got_duplicate_user = true;
1527 } else if (pace->type == SMB_ACL_GROUP &&
1528 pace->unix_ug.id == pace_group->unix_ug.id) {
1529 /* Already got one. */
1530 got_duplicate_group = true;
1531 } else if ((pace->type == SMB_ACL_GROUP)
1532 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1533 /* If the SID owning the file appears
1534 * in a group entry, then we have
1535 * enough duplication, they will still
1536 * have access */
1537 got_duplicate_user = true;
1538 }
1539 }
1540
1541 /* If the SID is equal for the user and group that we need
1542 to add the duplicate for, add only the group */
1543 if (!got_duplicate_user && !got_duplicate_group
1544 && dom_sid_equal(&pace_group->trustee,
1545 &pace_user->trustee)) {
1546 /* Add a duplicate SMB_ACL_GROUP entry, this
1547 * will cover the owning SID as well, as it
1548 * will always be mapped to both a uid and
1549 * gid. */
1550
1551 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1552 DEBUG(0,("talloc fail.\n"));
1553 return false;
1554 }
1555
1556 ZERO_STRUCTP(pace);
1557 pace->type = SMB_ACL_GROUP;;
1558 pace->owner_type = GID_ACE;
1559 pace->unix_ug.type = ID_TYPE_GID;
1560 pace->unix_ug.id = pace_group->unix_ug.id;
1561 pace->trustee = pace_group->trustee;
1562 pace->attr = pace_group->attr;
1563 pace->perms = pace_group->perms;
1564
1565 DLIST_ADD(*pp_ace, pace);
1566
1567 /* We're done here, make sure the
1568 statements below are not executed. */
1569 got_duplicate_user = true;
1570 got_duplicate_group = true;
1571 }
1572
1573 if (!got_duplicate_user) {
1574 /* Add a duplicate SMB_ACL_USER entry. */
1575 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1576 DEBUG(0,("talloc fail.\n"));
1577 return false;
1578 }
1579
1580 ZERO_STRUCTP(pace);
1581 pace->type = SMB_ACL_USER;;
1582 pace->owner_type = UID_ACE;
1583 pace->unix_ug.type = ID_TYPE_UID;
1584 pace->unix_ug.id = pace_user->unix_ug.id;
1585 pace->trustee = pace_user->trustee;
1586 pace->attr = pace_user->attr;
1587 pace->perms = pace_user->perms;
1588
1589 DLIST_ADD(*pp_ace, pace);
1590
1591 got_duplicate_user = true;
1592 }
1593
1594 if (!got_duplicate_group) {
1595 /* Add a duplicate SMB_ACL_GROUP entry. */
1596 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1597 DEBUG(0,("talloc fail.\n"));
1598 return false;
1599 }
1600
1601 ZERO_STRUCTP(pace);
1602 pace->type = SMB_ACL_GROUP;;
1603 pace->owner_type = GID_ACE;
1604 pace->unix_ug.type = ID_TYPE_GID;
1605 pace->unix_ug.id = pace_group->unix_ug.id;
1606 pace->trustee = pace_group->trustee;
1607 pace->attr = pace_group->attr;
1608 pace->perms = pace_group->perms;
1609
1610 DLIST_ADD(*pp_ace, pace);
1611
1612 got_duplicate_group = true;
1613 }
1614
1615 return true;
1616 }
1617
1618 /****************************************************************************
1619 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1620 If it does not have them, check if there are any entries where the trustee is the
1621 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1622 Note we must not do this to default directory ACLs.
1623 ****************************************************************************/
1624
1625 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1626 {
1627 bool got_user_obj, got_group_obj;
1628 canon_ace *current_ace;
1629 int i, entries;
1630
1631 entries = count_canon_ace_list(ace);
1632 got_user_obj = False;
1633 got_group_obj = False;
1634
1635 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1636 if (current_ace->type == SMB_ACL_USER_OBJ)
1637 got_user_obj = True;
1638 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1639 got_group_obj = True;
1640 }
1641 if (got_user_obj && got_group_obj) {
1642 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1643 return;
1644 }
1645
1646 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1647 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1648 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1649 current_ace->type = SMB_ACL_USER_OBJ;
1650 got_user_obj = True;
1651 }
1652 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1653 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1654 current_ace->type = SMB_ACL_GROUP_OBJ;
1655 got_group_obj = True;
1656 }
1657 }
1658 if (!got_user_obj)
1659 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1660 if (!got_group_obj)
1661 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1662 }
1663
1664 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1665 canon_ace **file_ace, canon_ace **dir_ace,
1666 bool *got_file_allow, bool *got_dir_allow,
1667 bool *all_aces_are_inherit_only,
1668 canon_ace *current_ace)
1669 {
1670
1671 /*
1672 * Map the given NT permissions into a UNIX mode_t containing only
1673 * S_I(R|W|X)USR bits.
1674 */
1675
1676 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1677 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1678
1679 /* Store the ace_flag. */
1680 current_ace->ace_flags = psa->flags;
1681
1682 /*
1683 * Now add the created ace to either the file list, the directory
1684 * list, or both. We *MUST* preserve the order here (hence we use
1685 * DLIST_ADD_END) as NT ACLs are order dependent.
1686 */
1687
1688 if (fsp->is_directory) {
1689
1690 /*
1691 * We can only add to the default POSIX ACE list if the ACE is
1692 * designed to be inherited by both files and directories.
1693 */
1694
1695 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1696 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1697
1698 canon_ace *current_dir_ace = current_ace;
1699 DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1700
1701 /*
1702 * Note if this was an allow ace. We can't process
1703 * any further deny ace's after this.
1704 */
1705
1706 if (current_ace->attr == ALLOW_ACE)
1707 *got_dir_allow = True;
1708
1709 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1710 DEBUG(0,("add_current_ace_to_acl: "
1711 "malformed ACL in "
1712 "inheritable ACL! Deny entry "
1713 "after Allow entry. Failing "
1714 "to set on file %s.\n",
1715 fsp_str_dbg(fsp)));
1716 return False;
1717 }
1718
1719 if( DEBUGLVL( 10 )) {
1720 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1721 print_canon_ace( current_ace, 0);
1722 }
1723
1724 /*
1725 * If this is not an inherit only ACE we need to add a duplicate
1726 * to the file acl.
1727 */
1728
1729 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1730 canon_ace *dup_ace = dup_canon_ace(current_ace);
1731
1732 if (!dup_ace) {
1733 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1734 return False;
1735 }
1736
1737 /*
1738 * We must not free current_ace here as its
1739 * pointer is now owned by the dir_ace list.
1740 */
1741 current_ace = dup_ace;
1742 /* We've essentially split this ace into two,
1743 * and added the ace with inheritance request
1744 * bits to the directory ACL. Drop those bits for
1745 * the ACE we're adding to the file list. */
1746 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1747 SEC_ACE_FLAG_CONTAINER_INHERIT|
1748 SEC_ACE_FLAG_INHERIT_ONLY);
1749 } else {
1750 /*
1751 * We must not free current_ace here as its
1752 * pointer is now owned by the dir_ace list.
1753 */
1754 current_ace = NULL;
1755 }
1756
1757 /*
1758 * current_ace is now either owned by file_ace
1759 * or is NULL. We can safely operate on current_dir_ace
1760 * to treat mapping for default acl entries differently
1761 * than access acl entries.
1762 */
1763
1764 if (current_dir_ace->owner_type == UID_ACE) {
1765 /*
1766 * We already decided above this is a uid,
1767 * for default acls ace's only CREATOR_OWNER
1768 * maps to ACL_USER_OBJ. All other uid
1769 * ace's are ACL_USER.
1770 */
1771 if (dom_sid_equal(&current_dir_ace->trustee,
1772 &global_sid_Creator_Owner)) {
1773 current_dir_ace->type = SMB_ACL_USER_OBJ;
1774 } else {
1775 current_dir_ace->type = SMB_ACL_USER;
1776 }
1777 }
1778
1779 if (current_dir_ace->owner_type == GID_ACE) {
1780 /*
1781 * We already decided above this is a gid,
1782 * for default acls ace's only CREATOR_GROUP
1783 * maps to ACL_GROUP_OBJ. All other uid
1784 * ace's are ACL_GROUP.
1785 */
1786 if (dom_sid_equal(&current_dir_ace->trustee,
1787 &global_sid_Creator_Group)) {
1788 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1789 } else {
1790 current_dir_ace->type = SMB_ACL_GROUP;
1791 }
1792 }
1793 }
1794 }
1795
1796 /*
1797 * Only add to the file ACL if not inherit only.
1798 */
1799
1800 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1801 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1802
1803 /*
1804 * Note if this was an allow ace. We can't process
1805 * any further deny ace's after this.
1806 */
1807
1808 if (current_ace->attr == ALLOW_ACE)
1809 *got_file_allow = True;
1810
1811 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1812 DEBUG(0,("add_current_ace_to_acl: malformed "
1813 "ACL in file ACL ! Deny entry after "
1814 "Allow entry. Failing to set on file "
1815 "%s.\n", fsp_str_dbg(fsp)));
1816 return False;
1817 }
1818
1819 if( DEBUGLVL( 10 )) {
1820 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1821 print_canon_ace( current_ace, 0);
1822 }
1823 *all_aces_are_inherit_only = False;
1824 /*
1825 * We must not free current_ace here as its
1826 * pointer is now owned by the file_ace list.
1827 */
1828 current_ace = NULL;
1829 }
1830
1831 /*
1832 * Free if ACE was not added.
1833 */
1834
1835 TALLOC_FREE(current_ace);
1836 return true;
1837 }
1838
1839 /****************************************************************************
1840 Unpack a struct security_descriptor into two canonical ace lists.
1841 ****************************************************************************/
1842
1843 static bool create_canon_ace_lists(files_struct *fsp,
1844 const SMB_STRUCT_STAT *pst,
1845 struct dom_sid *pfile_owner_sid,
1846 struct dom_sid *pfile_grp_sid,
1847 canon_ace **ppfile_ace,
1848 canon_ace **ppdir_ace,
1849 const struct security_acl *dacl)
1850 {
1851 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1852 canon_ace *file_ace = NULL;
1853 canon_ace *dir_ace = NULL;
1854 canon_ace *current_ace = NULL;
1855 bool got_dir_allow = False;
1856 bool got_file_allow = False;
1857 int i, j;
1858
1859 *ppfile_ace = NULL;
1860 *ppdir_ace = NULL;
1861
1862 /*
1863 * Convert the incoming ACL into a more regular form.
1864 */
1865
1866 for(i = 0; i < dacl->num_aces; i++) {
1867 struct security_ace *psa = &dacl->aces[i];
1868
1869 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1870 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1871 return False;
1872 }
1873 }
1874
1875 /*
1876 * Deal with the fact that NT 4.x re-writes the canonical format
1877 * that we return for default ACLs. If a directory ACE is identical
1878 * to a inherited directory ACE then NT changes the bits so that the
1879 * first ACE is set to OI|IO and the second ACE for this SID is set
1880 * to CI. We need to repair this. JRA.
1881 */
1882
1883 for(i = 0; i < dacl->num_aces; i++) {
1884 struct security_ace *psa1 = &dacl->aces[i];
1885
1886 for (j = i + 1; j < dacl->num_aces; j++) {
1887 struct security_ace *psa2 = &dacl->aces[j];
1888
1889 if (psa1->access_mask != psa2->access_mask)
1890 continue;
1891
1892 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1893 continue;
1894
1895 /*
1896 * Ok - permission bits and SIDs are equal.
1897 * Check if flags were re-written.
1898 */
1899
1900 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1901
1902 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1903 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1904
1905 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1906
1907 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1908 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1909
1910 }
1911 }
1912 }
1913
1914 for(i = 0; i < dacl->num_aces; i++) {
1915 struct security_ace *psa = &dacl->aces[i];
1916
1917 /*
1918 * Create a canon_ace entry representing this NT DACL ACE.
1919 */
1920
1921 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1922 free_canon_ace_list(file_ace);
1923 free_canon_ace_list(dir_ace);
1924 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1925 return False;
1926 }
1927
1928 ZERO_STRUCTP(current_ace);
1929
1930 sid_copy(&current_ace->trustee, &psa->trustee);
1931
1932 /*
1933 * Try and work out if the SID is a user or group
1934 * as we need to flag these differently for POSIX.
1935 * Note what kind of a POSIX ACL this should map to.
1936 */
1937
1938 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1939 current_ace->owner_type = WORLD_ACE;
1940 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1941 current_ace->unix_ug.id = -1;
1942 current_ace->type = SMB_ACL_OTHER;
1943 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1944 current_ace->owner_type = UID_ACE;
1945 current_ace->unix_ug.type = ID_TYPE_UID;
1946 current_ace->unix_ug.id = pst->st_ex_uid;
1947 current_ace->type = SMB_ACL_USER_OBJ;
1948
1949 /*
1950 * The Creator Owner entry only specifies inheritable permissions,
1951 * never access permissions. WinNT doesn't always set the ACE to
1952 * INHERIT_ONLY, though.
1953 */
1954
1955 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1956
1957 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1958 current_ace->owner_type = GID_ACE;
1959 current_ace->unix_ug.type = ID_TYPE_GID;
1960 current_ace->unix_ug.id = pst->st_ex_gid;
1961 current_ace->type = SMB_ACL_GROUP_OBJ;
1962
1963 /*
1964 * The Creator Group entry only specifies inheritable permissions,
1965 * never access permissions. WinNT doesn't always set the ACE to
1966 * INHERIT_ONLY, though.
1967 */
1968 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1969
1970 } else {
1971 struct unixid unixid;
1972
1973 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1974 free_canon_ace_list(file_ace);
1975 free_canon_ace_list(dir_ace);
1976 TALLOC_FREE(current_ace);
1977 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1978 "failed for %s (allocation failure)\n",
1979 sid_string_dbg(&current_ace->trustee)));
1980 return false;
1981 }
1982
1983 if (unixid.type == ID_TYPE_BOTH) {
1984 /* If it's the owning user, this is a
1985 * user_obj, not a user. This way, we
1986 * get a valid ACL for groups that own
1987 * files, without putting user ACL
1988 * entries in for groups otherwise */
1989 if (unixid.id == pst->st_ex_uid) {
1990 current_ace->owner_type = UID_ACE;
1991 current_ace->unix_ug.type = ID_TYPE_UID;
1992 current_ace->unix_ug.id = unixid.id;
1993 current_ace->type = SMB_ACL_USER_OBJ;
1994
1995 /* Add the user object to the posix ACL,
1996 and proceed to the group mapping
1997 below. This handles the talloc_free
1998 of current_ace if not added for some
1999 reason */
2000 if (!add_current_ace_to_acl(fsp,
2001 psa,
2002 &file_ace,
2003 &dir_ace,
2004 &got_file_allow,
2005 &got_dir_allow,
2006 &all_aces_are_inherit_only,
2007 current_ace)) {
2008 free_canon_ace_list(file_ace);
2009 free_canon_ace_list(dir_ace);
2010 return false;
2011 }
2012
2013 if ((current_ace = talloc(talloc_tos(),
2014 canon_ace)) == NULL) {
2015 free_canon_ace_list(file_ace);
2016 free_canon_ace_list(dir_ace);
2017 DEBUG(0,("create_canon_ace_lists: "
2018 "malloc fail.\n"));
2019 return False;
2020 }
2021
2022 ZERO_STRUCTP(current_ace);
2023 }
2024
2025 sid_copy(&current_ace->trustee, &psa->trustee);
2026
2027 current_ace->unix_ug.type = ID_TYPE_GID;
2028 current_ace->unix_ug.id = unixid.id;
2029 current_ace->owner_type = GID_ACE;
2030 /* If it's the primary group, this is a
2031 group_obj, not a group. */
2032 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2033 current_ace->type = SMB_ACL_GROUP_OBJ;
2034 } else {
2035 current_ace->type = SMB_ACL_GROUP;
2036 }
2037
2038 } else if (unixid.type == ID_TYPE_UID) {
2039 current_ace->owner_type = UID_ACE;
2040 current_ace->unix_ug.type = ID_TYPE_UID;
2041 current_ace->unix_ug.id = unixid.id;
2042 /* If it's the owning user, this is a user_obj,
2043 not a user. */
2044 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2045 current_ace->type = SMB_ACL_USER_OBJ;
2046 } else {
2047 current_ace->type = SMB_ACL_USER;
2048 }
2049 } else if (unixid.type == ID_TYPE_GID) {
2050 current_ace->unix_ug.type = ID_TYPE_GID;
2051 current_ace->unix_ug.id = unixid.id;
2052 current_ace->owner_type = GID_ACE;
2053 /* If it's the primary group, this is a
2054 group_obj, not a group. */
2055 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2056 current_ace->type = SMB_ACL_GROUP_OBJ;
2057 } else {
2058 current_ace->type = SMB_ACL_GROUP;
2059 }
2060 } else {
2061 /*
2062 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2063 */
2064
2065 if (non_mappable_sid(&psa->trustee)) {
2066 DEBUG(10, ("create_canon_ace_lists: ignoring "
2067 "non-mappable SID %s\n",
2068 sid_string_dbg(&psa->trustee)));
2069 TALLOC_FREE(current_ace);
2070 continue;
2071 }
2072
2073 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2074 DEBUG(10, ("create_canon_ace_lists: ignoring "
2075 "unknown or foreign SID %s\n",
2076 sid_string_dbg(&psa->trustee)));
2077 TALLOC_FREE(current_ace);
2078 continue;
2079 }
2080
2081 free_canon_ace_list(file_ace);
2082 free_canon_ace_list(dir_ace);
2083 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2084 "%s to uid or gid.\n",
2085 sid_string_dbg(&current_ace->trustee)));
2086 TALLOC_FREE(current_ace);
2087 return false;
2088 }
2089 }
2090
2091 /* handles the talloc_free of current_ace if not added for some reason */
2092 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2093 &got_file_allow, &got_dir_allow,
2094 &all_aces_are_inherit_only, current_ace)) {
2095 free_canon_ace_list(file_ace);
2096 free_canon_ace_list(dir_ace);
2097 return false;
2098 }
2099 }
2100
2101 if (fsp->is_directory && all_aces_are_inherit_only) {
2102 /*
2103 * Windows 2000 is doing one of these weird 'inherit acl'
2104 * traverses to conserve NTFS ACL resources. Just pretend
2105 * there was no DACL sent. JRA.
2106 */
2107
2108 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2109 free_canon_ace_list(file_ace);
2110 free_canon_ace_list(dir_ace);
2111 file_ace = NULL;
2112 dir_ace = NULL;
2113 } else {
2114 /*
2115 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2116 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2117 * entries can be converted to *_OBJ. Don't do this for the default
2118 * ACL, we will create them separately for this if needed inside
2119 * ensure_canon_entry_valid_on_set().
2120 */
2121 if (file_ace) {
2122 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2123 }
2124 }
2125
2126 *ppfile_ace = file_ace;
2127 *ppdir_ace = dir_ace;
2128
2129 return True;
2130 }
2131
2132 /****************************************************************************
2133 ASCII art time again... JRA :-).
2134
2135 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2136 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2137 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2138 allow or deny have been merged, so the same SID can only appear once in the deny
2139 list or once in the allow list.
2140
2141 We then process as follows :
2142
2143 ---------------------------------------------------------------------------
2144 First pass - look for a Everyone DENY entry.
2145
2146 If it is deny all (rwx) trunate the list at this point.
2147 Else, walk the list from this point and use the deny permissions of this
2148 entry as a mask on all following allow entries. Finally, delete
2149 the Everyone DENY entry (we have applied it to everything possible).
2150
2151 In addition, in this pass we remove any DENY entries that have
2152 no permissions (ie. they are a DENY nothing).
2153 ---------------------------------------------------------------------------
2154 Second pass - only deal with deny user entries.
2155
2156 DENY user1 (perms XXX)
2157
2158 new_perms = 0
2159 for all following allow group entries where user1 is in group
2160 new_perms |= group_perms;
2161
2162 user1 entry perms = new_perms & ~ XXX;
2163
2164 Convert the deny entry to an allow entry with the new perms and
2165 push to the end of the list. Note if the user was in no groups
2166 this maps to a specific allow nothing entry for this user.
2167
2168 The common case from the NT ACL choser (userX deny all) is
2169 optimised so we don't do the group lookup - we just map to
2170 an allow nothing entry.
2171
2172 What we're doing here is inferring the allow permissions the
2173 person setting the ACE on user1 wanted by looking at the allow
2174 permissions on the groups the user is currently in. This will
2175 be a snapshot, depending on group membership but is the best
2176 we can do and has the advantage of failing closed rather than
2177 open.
2178 ---------------------------------------------------------------------------
2179 Third pass - only deal with deny group entries.
2180
2181 DENY group1 (perms XXX)
2182
2183 for all following allow user entries where user is in group1
2184 user entry perms = user entry perms & ~ XXX;
2185
2186 If there is a group Everyone allow entry with permissions YYY,
2187 convert the group1 entry to an allow entry and modify its
2188 permissions to be :
2189
2190 new_perms = YYY & ~ XXX
2191
2192 and push to the end of the list.
2193
2194 If there is no group Everyone allow entry then convert the
2195 group1 entry to a allow nothing entry and push to the end of the list.
2196
2197 Note that the common case from the NT ACL choser (groupX deny all)
2198 cannot be optimised here as we need to modify user entries who are
2199 in the group to change them to a deny all also.
2200
2201 What we're doing here is modifying the allow permissions of
2202 user entries (which are more specific in POSIX ACLs) to mask
2203 out the explicit deny set on the group they are in. This will
2204 be a snapshot depending on current group membership but is the
2205 best we can do and has the advantage of failing closed rather
2206 than open.
2207 ---------------------------------------------------------------------------
2208 Fourth pass - cope with cumulative permissions.
2209
2210 for all allow user entries, if there exists an allow group entry with
2211 more permissive permissions, and the user is in that group, rewrite the
2212 allow user permissions to contain both sets of permissions.
2213
2214 Currently the code for this is #ifdef'ed out as these semantics make
2215 no sense to me. JRA.
2216 ---------------------------------------------------------------------------
2217
2218 Note we *MUST* do the deny user pass first as this will convert deny user
2219 entries into allow user entries which can then be processed by the deny
2220 group pass.
2221
2222 The above algorithm took a *lot* of thinking about - hence this
2223 explaination :-). JRA.
2224 ****************************************************************************/
2225
2226 /****************************************************************************
2227 Process a canon_ace list entries. This is very complex code. We need
2228 to go through and remove the "deny" permissions from any allow entry that matches
2229 the id of this entry. We have already refused any NT ACL that wasn't in correct
2230 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2231 we just remove it (to fail safe). We have already removed any duplicate ace
2232 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2233 allow entries.
2234 ****************************************************************************/
2235
2236 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2237 {
2238 canon_ace *ace_list = *pp_ace_list;
2239 canon_ace *curr_ace = NULL;
2240 canon_ace *curr_ace_next = NULL;
2241
2242 /* Pass 1 above - look for an Everyone, deny entry. */
2243
2244 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2245 canon_ace *allow_ace_p;
2246
2247 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2248
2249 if (curr_ace->attr != DENY_ACE)
2250 continue;
2251
2252 if (curr_ace->perms == (mode_t)0) {
2253
2254 /* Deny nothing entry - delete. */
2255
2256 DLIST_REMOVE(ace_list, curr_ace);
2257 continue;
2258 }
2259
2260 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2261 continue;
2262
2263 /* JRATEST - assert. */
2264 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2265
2266 if (curr_ace->perms == ALL_ACE_PERMS) {
2267
2268 /*
2269 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2270 * list at this point including this entry.
2271 */
2272
2273 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2274
2275 free_canon_ace_list( curr_ace );
2276 if (prev_entry)
2277 DLIST_REMOVE(ace_list, prev_entry);
2278 else {
2279 /* We deleted the entire list. */
2280 ace_list = NULL;
2281 }
2282 break;
2283 }
2284
2285 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2286
2287 /*
2288 * Only mask off allow entries.
2289 */
2290
2291 if (allow_ace_p->attr != ALLOW_ACE)
2292 continue;
2293
2294 allow_ace_p->perms &= ~curr_ace->perms;
2295 }
2296
2297 /*
2298 * Now it's been applied, remove it.
2299 */
2300
2301 DLIST_REMOVE(ace_list, curr_ace);
2302 }
2303
2304 /* Pass 2 above - deal with deny user entries. */
2305
2306 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2307 mode_t new_perms = (mode_t)0;
2308 canon_ace *allow_ace_p;
2309
2310 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2311
2312 if (curr_ace->attr != DENY_ACE)
2313 continue;
2314
2315 if (curr_ace->owner_type != UID_ACE)
2316 continue;
2317
2318 if (curr_ace->perms == ALL_ACE_PERMS) {
2319
2320 /*
2321 * Optimisation - this is a deny everything to this user.
2322 * Convert to an allow nothing and push to the end of the list.
2323 */
2324
2325 curr_ace->attr = ALLOW_ACE;
2326 curr_ace->perms = (mode_t)0;
2327 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2328 continue;
2329 }
2330
2331 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2332
2333 if (allow_ace_p->attr != ALLOW_ACE)
2334 continue;
2335
2336 /* We process GID_ACE and WORLD_ACE entries only. */
2337
2338 if (allow_ace_p->owner_type == UID_ACE)
2339 continue;
2340
2341 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2342 new_perms |= allow_ace_p->perms;
2343 }
2344
2345 /*
2346 * Convert to a allow entry, modify the perms and push to the end
2347 * of the list.
2348 */
2349
2350 curr_ace->attr = ALLOW_ACE;
2351 curr_ace->perms = (new_perms & ~curr_ace->perms);
2352 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2353 }
2354
2355 /* Pass 3 above - deal with deny group entries. */
2356
2357 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2358 canon_ace *allow_ace_p;
2359 canon_ace *allow_everyone_p = NULL;
2360
2361 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2362
2363 if (curr_ace->attr != DENY_ACE)
2364 continue;
2365
2366 if (curr_ace->owner_type != GID_ACE)
2367 continue;
2368
2369 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2370
2371 if (allow_ace_p->attr != ALLOW_ACE)
2372 continue;
2373
2374 /* Store a pointer to the Everyone allow, if it exists. */
2375 if (allow_ace_p->owner_type == WORLD_ACE)
2376 allow_everyone_p = allow_ace_p;
2377
2378 /* We process UID_ACE entries only. */
2379
2380 if (allow_ace_p->owner_type != UID_ACE)
2381 continue;
2382
2383 /* Mask off the deny group perms. */
2384
2385 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2386 allow_ace_p->perms &= ~curr_ace->perms;
2387 }
2388
2389 /*
2390 * Convert the deny to an allow with the correct perms and
2391 * push to the end of the list.
2392 */
2393
2394 curr_ace->attr = ALLOW_ACE;
2395 if (allow_everyone_p)
2396 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2397 else
2398 curr_ace->perms = (mode_t)0;
2399 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2400 }
2401
2402 /* Doing this fourth pass allows Windows semantics to be layered
2403 * on top of POSIX semantics. I'm not sure if this is desirable.
2404 * For example, in W2K ACLs there is no way to say, "Group X no
2405 * access, user Y full access" if user Y is a member of group X.
2406 * This seems completely broken semantics to me.... JRA.
2407 */
2408
2409 #if 0
2410 /* Pass 4 above - deal with allow entries. */
2411
2412 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2413 canon_ace *allow_ace_p;
2414
2415 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2416
2417 if (curr_ace->attr != ALLOW_ACE)
2418 continue;
2419
2420 if (curr_ace->owner_type != UID_ACE)
2421 continue;
2422
2423 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2424
2425 if (allow_ace_p->attr != ALLOW_ACE)
2426 continue;
2427
2428 /* We process GID_ACE entries only. */
2429
2430 if (allow_ace_p->owner_type != GID_ACE)
2431 continue;
2432
2433 /* OR in the group perms. */
2434
2435 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2436 curr_ace->perms |= allow_ace_p->perms;
2437 }
2438 }
2439 #endif
2440
2441 *pp_ace_list = ace_list;
2442 }
2443
2444 /****************************************************************************
2445 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2446 succeeding.
2447 ****************************************************************************/
2448
2449 static bool unpack_canon_ace(files_struct *fsp,
2450 const SMB_STRUCT_STAT *pst,
2451 struct dom_sid *pfile_owner_sid,
2452 struct dom_sid *pfile_grp_sid,
2453 canon_ace **ppfile_ace,
2454 canon_ace **ppdir_ace,
2455 uint32 security_info_sent,
2456 const struct security_descriptor *psd)
2457 {
2458 canon_ace *file_ace = NULL;
2459 canon_ace *dir_ace = NULL;
2460
2461 *ppfile_ace = NULL;
2462 *ppdir_ace = NULL;
2463
2464 if(security_info_sent == 0) {
2465 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2466 return False;
2467 }
2468
2469 /*
2470 * If no DACL then this is a chown only security descriptor.
2471 */
2472
2473 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2474 return True;
2475
2476 /*
2477 * Now go through the DACL and create the canon_ace lists.
2478 */
2479
2480 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2481 &file_ace, &dir_ace, psd->dacl))
2482 return False;
2483
2484 if ((file_ace == NULL) && (dir_ace == NULL)) {
2485 /* W2K traverse DACL set - ignore. */
2486 return True;
2487 }
2488
2489 /*
2490 * Go through the canon_ace list and merge entries
2491 * belonging to identical users of identical allow or deny type.
2492 * We can do this as all deny entries come first, followed by
2493 * all allow entries (we have mandated this before accepting this acl).
2494 */
2495
2496 print_canon_ace_list( "file ace - before merge", file_ace);
2497 merge_aces( &file_ace, false);
2498
2499 print_canon_ace_list( "dir ace - before merge", dir_ace);
2500 merge_aces( &dir_ace, true);
2501
2502 /*
2503 * NT ACLs are order dependent. Go through the acl lists and
2504 * process DENY entries by masking the allow entries.
2505 */
2506
2507 print_canon_ace_list( "file ace - before deny", file_ace);
2508 process_deny_list(fsp->conn, &file_ace);
2509
2510 print_canon_ace_list( "dir ace - before deny", dir_ace);
2511 process_deny_list(fsp->conn, &dir_ace);
2512
2513 /*
2514 * A well formed POSIX file or default ACL has at least 3 entries, a
2515 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2516 * and optionally a mask entry. Ensure this is the case.
2517 */
2518
2519 print_canon_ace_list( "file ace - before valid", file_ace);
2520
2521 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2522 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2523 free_canon_ace_list(file_ace);
2524 free_canon_ace_list(dir_ace);
2525 return False;
2526 }
2527
2528 print_canon_ace_list( "dir ace - before valid", dir_ace);
2529
2530 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2531 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2532 free_canon_ace_list(file_ace);
2533 free_canon_ace_list(dir_ace);
2534 return False;
2535 }
2536
2537 print_canon_ace_list( "file ace - return", file_ace);
2538 print_canon_ace_list( "dir ace - return", dir_ace);
2539
2540 *ppfile_ace = file_ace;
2541 *ppdir_ace = dir_ace;
2542 return True;
2543
2544 }
2545
2546 /******************************************************************************
2547 When returning permissions, try and fit NT display
2548 semantics if possible. Note the the canon_entries here must have been malloced.
2549 The list format should be - first entry = owner, followed by group and other user
2550 entries, last entry = other.
2551
2552 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2553 are not ordered, and match on the most specific entry rather than walking a list,
2554 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2555
2556 Entry 0: owner : deny all except read and write.
2557 Entry 1: owner : allow read and write.
2558 Entry 2: group : deny all except read.
2559 Entry 3: group : allow read.
2560 Entry 4: Everyone : allow read.
2561
2562 But NT cannot display this in their ACL editor !
2563 ********************************************************************************/
2564
2565 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2566 {
2567 canon_ace *l_head = *pp_list_head;
2568 canon_ace *owner_ace = NULL;
2569 canon_ace *other_ace = NULL;
2570 canon_ace *ace = NULL;
2571
2572 for (ace = l_head; ace; ace = ace->next) {
2573 if (ace->type == SMB_ACL_USER_OBJ)
2574 owner_ace = ace;
2575 else if (ace->type == SMB_ACL_OTHER) {
2576 /* Last ace - this is "other" */
2577 other_ace = ace;
2578 }
2579 }
2580
2581 if (!owner_ace || !other_ace) {
2582 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2583 filename ));
2584 return;
2585 }
2586
2587 /*
2588 * The POSIX algorithm applies to owner first, and other last,
2589 * so ensure they are arranged in this order.
2590 */
2591
2592 if (owner_ace) {
2593 DLIST_PROMOTE(l_head, owner_ace);
2594 }
2595
2596 if (other_ace) {
2597 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2598 }
2599
2600 /* We have probably changed the head of the list. */
2601
2602 *pp_list_head = l_head;
2603 }
2604
2605 /****************************************************************************
2606 Create a linked list of canonical ACE entries.
2607 ****************************************************************************/
2608
2609 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2610 const char *fname, SMB_ACL_T posix_acl,
2611 const SMB_STRUCT_STAT *psbuf,
2612 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2613 {
2614 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2615 canon_ace *l_head = NULL;
2616 canon_ace *ace = NULL;
2617 canon_ace *next_ace = NULL;
2618 int entry_id = SMB_ACL_FIRST_ENTRY;
2619 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2620 SMB_ACL_ENTRY_T entry;
2621 size_t ace_count;
2622
2623 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2624 SMB_ACL_TAG_T tagtype;
2625 SMB_ACL_PERMSET_T permset;
2626 struct dom_sid sid;
2627 struct unixid unix_ug;
2628 enum ace_owner owner_type;
2629
2630 entry_id = SMB_ACL_NEXT_ENTRY;
2631
2632 /* Is this a MASK entry ? */
2633 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2634 continue;
2635
2636 if (sys_acl_get_permset(entry, &permset) == -1)
2637 continue;
2638
2639 /* Decide which SID to use based on the ACL type. */
2640 switch(tagtype) {
2641 case SMB_ACL_USER_OBJ:
2642 /* Get the SID from the owner. */
2643 sid_copy(&sid, powner);
2644 unix_ug.type = ID_TYPE_UID;
2645 unix_ug.id = psbuf->st_ex_uid;
2646 owner_type = UID_ACE;
2647 break;
2648 case SMB_ACL_USER:
2649 {
2650 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2651 if (puid == NULL) {
2652 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2653 continue;
2654 }
2655 uid_to_sid( &sid, *puid);
2656 unix_ug.type = ID_TYPE_UID;
2657 unix_ug.id = *puid;
2658 owner_type = UID_ACE;
2659 break;
2660 }
2661 case SMB_ACL_GROUP_OBJ:
2662 /* Get the SID from the owning group. */
2663 sid_copy(&sid, pgroup);
2664 unix_ug.type = ID_TYPE_GID;
2665 unix_ug.id = psbuf->st_ex_gid;
2666 owner_type = GID_ACE;
2667 break;
2668 case SMB_ACL_GROUP:
2669 {
2670 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2671 if (pgid == NULL) {
2672 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2673 continue;
2674 }
2675 gid_to_sid( &sid, *pgid);
2676 unix_ug.type = ID_TYPE_GID;
2677 unix_ug.id = *pgid;
2678 owner_type = GID_ACE;
2679 break;
2680 }
2681 case SMB_ACL_MASK:
2682 acl_mask = convert_permset_to_mode_t(permset);
2683 continue; /* Don't count the mask as an entry. */
2684 case SMB_ACL_OTHER:
2685 /* Use the Everyone SID */
2686 sid = global_sid_World;
2687 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2688 unix_ug.id = -1;
2689 owner_type = WORLD_ACE;
2690 break;
2691 default:
2692 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2693 continue;
2694 }
2695
2696 /*
2697 * Add this entry to the list.
2698 */
2699
2700 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2701 goto fail;
2702
2703 ZERO_STRUCTP(ace);
2704 ace->type = tagtype;
2705 ace->perms = convert_permset_to_mode_t(permset);
2706 ace->attr = ALLOW_ACE;
2707 ace->trustee = sid;
2708 ace->unix_ug = unix_ug;
2709 ace->owner_type = owner_type;
2710 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2711
2712 DLIST_ADD(l_head, ace);
2713 }
2714
2715 /*
2716 * This next call will ensure we have at least a user/group/world set.
2717 */
2718
2719 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2720 powner, pgroup,
2721 psbuf))
2722 goto fail;
2723
2724 /*
2725 * Now go through the list, masking the permissions with the
2726 * acl_mask. Ensure all DENY Entries are at the start of the list.
2727 */
2728
2729 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2730
2731 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2732 next_ace = ace->next;
2733
2734 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2735 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2736 ace->perms &= acl_mask;
2737
2738 if (ace->perms == 0) {
2739 DLIST_PROMOTE(l_head, ace);
2740 }
2741
2742 if( DEBUGLVL( 10 ) ) {
2743 print_canon_ace(ace, ace_count);
2744 }
2745 }
2746
2747 arrange_posix_perms(fname,&l_head );
2748
2749 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2750
2751 return l_head;
2752
2753 fail:
2754
2755 free_canon_ace_list(l_head);
2756 return NULL;
2757 }
2758
2759 /****************************************************************************
2760 Check if the current user group list contains a given group.
2761 ****************************************************************************/
2762
2763 bool current_user_in_group(connection_struct *conn, gid_t gid)
2764 {
2765 int i;
2766 const struct security_unix_token *utok = get_current_utok(conn);
2767
2768 for (i = 0; i < utok->ngroups; i++) {
2769 if (utok->groups[i] == gid) {
2770 return True;
2771 }
2772 }
2773
2774 return False;
2775 }
2776
2777 /****************************************************************************
2778 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2779 ****************************************************************************/
2780
2781 static bool acl_group_override(connection_struct *conn,
2782 const struct smb_filename *smb_fname)
2783 {
2784 if ((errno != EPERM) && (errno != EACCES)) {
2785 return false;
2786 }
2787
2788 /* file primary group == user primary or supplementary group */
2789 if (lp_acl_group_control(SNUM(conn)) &&
2790 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2791 return true;
2792 }
2793
2794 /* user has writeable permission */
2795 if (lp_dos_filemode(SNUM(conn)) &&
2796 can_write_to_file(conn, smb_fname)) {
2797 return true;
2798 }
2799
2800 return false;
2801 }
2802
2803 /****************************************************************************
2804 Attempt to apply an ACL to a file or directory.
2805 ****************************************************************************/
2806
2807 static bool set_canon_ace_list(files_struct *fsp,
2808 canon_ace *the_ace,
2809 bool default_ace,
2810 const SMB_STRUCT_STAT *psbuf,
2811 bool *pacl_set_support)
2812 {
2813 connection_struct *conn = fsp->conn;
2814 bool ret = False;
2815 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2816 canon_ace *p_ace;
2817 int i;
2818 SMB_ACL_ENTRY_T mask_entry;
2819 bool got_mask_entry = False;
2820 SMB_ACL_PERMSET_T mask_permset;
2821 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2822 bool needs_mask = False;
2823 mode_t mask_perms = 0;
2824
2825 /* Use the psbuf that was passed in. */
2826 if (psbuf != &fsp->fsp_name->st) {
2827 fsp->fsp_name->st = *psbuf;
2828 }
2829
2830 #if defined(POSIX_ACL_NEEDS_MASK)
2831 /* HP-UX always wants to have a mask (called "class" there). */
2832 needs_mask = True;
2833 #endif
2834
2835 if (the_acl == NULL) {
2836 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2837 return false;
2838 }
2839
2840 if( DEBUGLVL( 10 )) {
2841 dbgtext("set_canon_ace_list: setting ACL:\n");
2842 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2843 print_canon_ace( p_ace, i);
2844 }
2845 }
2846
2847 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2848 SMB_ACL_ENTRY_T the_entry;
2849 SMB_ACL_PERMSET_T the_permset;
2850
2851 /*
2852 * ACLs only "need" an ACL_MASK entry if there are any named user or
2853 * named group entries. But if there is an ACL_MASK entry, it applies
2854 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2855 * so that it doesn't deny (i.e., mask off) any permissions.
2856 */
2857
2858 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2859 needs_mask = True;
2860 mask_perms |= p_ace->perms;
2861 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2862 mask_perms |= p_ace->perms;
2863 }
2864
2865 /*
2866 * Get the entry for this ACE.
2867 */
2868
2869 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2870 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2871 i, strerror(errno) ));
2872 goto fail;
2873 }
2874
2875 if (p_ace->type == SMB_ACL_MASK) {
2876 mask_entry = the_entry;
2877 got_mask_entry = True;
2878 }
2879
2880 /*
2881 * Ok - we now know the ACL calls should be working, don't
2882 * allow fallback to chmod.
2883 */
2884
2885 *pacl_set_support = True;
2886
2887 /*
2888 * Initialise the entry from the canon_ace.
2889 */
2890
2891 /*
2892 * First tell the entry what type of ACE this is.
2893 */
2894
2895 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2896 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2897 i, strerror(errno) ));
2898 goto fail;
2899 }
2900
2901 /*
2902 * Only set the qualifier (user or group id) if the entry is a user
2903 * or group id ACE.
2904 */
2905
2906 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2907 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2908 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2909 i, strerror(errno) ));
2910 goto fail;
2911 }
2912 }
2913
2914 /*
2915 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2916 */
2917
2918 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2919 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2920 i, strerror(errno) ));
2921 goto fail;
2922 }
2923
2924 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2925 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2926 (unsigned int)p_ace->perms, i, strerror(errno) ));
2927 goto fail;
2928 }
2929
2930 /*
2931 * ..and apply them to the entry.
2932 */
2933
2934 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2935 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2936 i, strerror(errno) ));
2937 goto fail;
2938 }
2939
2940 if( DEBUGLVL( 10 ))
2941 print_canon_ace( p_ace, i);
2942
2943 }
2944
2945 if (needs_mask && !got_mask_entry) {
2946 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2947 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2948 goto fail;
2949 }
2950
2951 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2952 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2953 goto fail;
2954 }
2955
2956 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2957 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2958 goto fail;
2959 }
2960
2961 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2962 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2963 goto fail;
2964 }
2965
2966 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2967 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2968 goto fail;
2969 }
2970 }
2971
2972 /*
2973 * Finally apply it to the file or directory.
2974 */
2975
2976 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2977 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2978 the_acl_type, the_acl) == -1) {
2979 /*
2980 * Some systems allow all the above calls and only fail with no ACL support
2981 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2982 */
2983 if (no_acl_syscall_error(errno)) {
2984 *pacl_set_support = False;
2985 }
2986
2987 if (acl_group_override(conn, fsp->fsp_name)) {
2988 int sret;
2989
2990 DEBUG(5,("set_canon_ace_list: acl group "
2991 "control on and current user in file "
2992 "%s primary group.\n",
2993 fsp_str_dbg(fsp)));
2994
2995 become_root();
2996 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2997 fsp->fsp_name->base_name, the_acl_type,
2998 the_acl);
2999 unbecome_root();
3000 if (sret == 0) {
3001 ret = True;
3002 }
3003 }
3004
3005 if (ret == False) {
3006 DEBUG(2,("set_canon_ace_list: "
3007 "sys_acl_set_file type %s failed for "
3008 "file %s (%s).\n",
3009 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3010 "directory default" : "file",
3011 fsp_str_dbg(fsp), strerror(errno)));
3012 goto fail;
3013 }
3014 }
3015 } else {
3016 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3017 /*
3018 * Some systems allow all the above calls and only fail with no ACL support
3019 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3020 */
3021 if (no_acl_syscall_error(errno)) {
3022 *pacl_set_support = False;
3023 }
3024
3025 if (acl_group_override(conn, fsp->fsp_name)) {
3026 int sret;
3027
3028 DEBUG(5,("set_canon_ace_list: acl group "
3029 "control on and current user in file "
3030 "%s primary group.\n",
3031 fsp_str_dbg(fsp)));
3032
3033 become_root();
3034 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3035 unbecome_root();
3036 if (sret == 0) {
3037 ret = True;
3038 }
3039 }
3040
3041 if (ret == False) {
3042 DEBUG(2,("set_canon_ace_list: "
3043 "sys_acl_set_file failed for file %s "
3044 "(%s).\n",
3045 fsp_str_dbg(fsp), strerror(errno)));
3046 goto fail;
3047 }
3048 }
3049 }
3050
3051 ret = True;
3052
3053 fail:
3054
3055 if (the_acl != NULL) {
3056 TALLOC_FREE(the_acl);
3057 }
3058
3059 return ret;
3060 }
3061
3062 /****************************************************************************
3063
3064 ****************************************************************************/
3065
3066 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3067 {
3068 SMB_ACL_ENTRY_T entry;
3069
3070 if (!the_acl)
3071 return NULL;
3072 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3073 TALLOC_FREE(the_acl);
3074 return NULL;
3075 }
3076 return the_acl;
3077 }
3078
3079 /****************************************************************************
3080 Convert a canon_ace to a generic 3 element permission - if possible.
3081 ****************************************************************************/
3082
3083 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3084
3085 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3086 {
3087 int snum = SNUM(fsp->conn);
3088 size_t ace_count = count_canon_ace_list(file_ace_list);
3089 canon_ace *ace_p;
3090 canon_ace *owner_ace = NULL;
3091 canon_ace *group_ace = NULL;
3092 canon_ace *other_ace = NULL;
3093 mode_t and_bits;
3094 mode_t or_bits;
3095
3096 if (ace_count != 3) {
3097 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3098 "entries for file %s to convert to posix perms.\n",
3099 fsp_str_dbg(fsp)));
3100 return False;
3101 }
3102
3103 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3104 if (ace_p->owner_type == UID_ACE)
3105 owner_ace = ace_p;
3106 else if (ace_p->owner_type == GID_ACE)
3107 group_ace = ace_p;
3108 else if (ace_p->owner_type == WORLD_ACE)
3109 other_ace = ace_p;
3110 }
3111
3112 if (!owner_ace || !group_ace || !other_ace) {
3113 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3114 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3115 return False;
3116 }
3117
3118 *posix_perms = (mode_t)0;
3119
3120 *posix_perms |= owner_ace->perms;
3121 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3122 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3123 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3124 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3125 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3126 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3127
3128 /* The owner must have at least read access. */
3129
3130 *posix_perms |= S_IRUSR;
3131 if (fsp->is_directory)
3132 *posix_perms |= (S_IWUSR|S_IXUSR);
3133
3134 /* If requested apply the masks. */
3135
3136 /* Get the initial bits to apply. */
3137
3138 if (fsp->is_directory) {
3139 and_bits = lp_dir_mask(snum);
3140 or_bits = lp_force_dir_mode(snum);
3141 } else {
3142 and_bits = lp_create_mask(snum);
3143 or_bits = lp_force_create_mode(snum);
3144 }
3145
3146 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3147
3148 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3149 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3150 (int)group_ace->perms, (int)other_ace->perms,
3151 (int)*posix_perms, fsp_str_dbg(fsp)));
3152
3153 return True;
3154 }
3155
3156 /****************************************************************************
3157 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3158 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3159 with CI|OI set so it is inherited and also applies to the directory.
3160 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3161 ****************************************************************************/
3162
3163 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3164 {
3165 size_t i, j;
3166
3167 for (i = 0; i < num_aces; i++) {
3168 for (j = i+1; j < num_aces; j++) {
3169 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3170 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3171 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3172 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3173
3174 /* We know the lower number ACE's are file entries. */
3175 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3176 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3177 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3178 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3179 (i_inh == j_inh) &&
3180 (i_flags_ni == 0) &&
3181 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3182 SEC_ACE_FLAG_CONTAINER_INHERIT|
3183 SEC_ACE_FLAG_INHERIT_ONLY))) {
3184 /*
3185 * W2K wants to have access allowed zero access ACE's
3186 * at the end of the list. If the mask is zero, merge
3187 * the non-inherited ACE onto the inherited ACE.
3188 */
3189
3190 if (nt_ace_list[i].access_mask == 0) {
3191 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3192 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3193 if (num_aces - i - 1 > 0)
3194 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3195 sizeof(struct security_ace));
3196
3197 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3198 (unsigned int)i, (unsigned int)j ));
3199 } else {
3200 /*
3201 * These are identical except for the flags.
3202 * Merge the inherited ACE onto the non-inherited ACE.
3203 */
3204
3205 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3206 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3207 if (num_aces - j - 1 > 0)
3208 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3209 sizeof(struct security_ace));
3210
3211 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3212 (unsigned int)j, (unsigned int)i ));
3213 }
3214 num_aces--;
3215 break;
3216 }
3217 }
3218 }
3219
3220 return num_aces;
3221 }
3222
3223 /*
3224 * Add or Replace ACE entry.
3225 * In some cases we need to add a specific ACE for compatibility reasons.
3226 * When doing that we must make sure we are not actually creating a duplicate
3227 * entry. So we need to search whether an ACE entry already exist and eventually
3228 * replacce the access mask, or add a completely new entry if none was found.
3229 *
3230 * This function assumes the array has enough space to add a new entry without
3231 * any reallocation of memory.
3232 */
3233
3234 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3235 const struct dom_sid *sid, enum security_ace_type type,
3236 uint32_t mask, uint8_t flags)
3237 {
3238 int i;
3239
3240 /* first search for a duplicate */
3241 for (i = 0; i < *num_aces; i++) {
3242 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3243 (nt_ace_list[i].flags == flags)) break;
3244 }
3245
3246 if (i < *num_aces) { /* found */
3247 nt_ace_list[i].type = type;
3248 nt_ace_list[i].access_mask = mask;
3249 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3250 i, sid_string_dbg(sid), flags));
3251 return;
3252 }
3253
3254 /* not found, append it */
3255 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3256 }
3257
3258
3259 /****************************************************************************
3260 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3261 the space for the return elements and returns the size needed to return the
3262 security descriptor. This should be the only external function needed for
3263 the UNIX style get ACL.
3264 ****************************************************************************/
3265
3266 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3267 const char *name,
3268 const SMB_STRUCT_STAT *sbuf,
3269 struct pai_val *pal,
3270 SMB_ACL_T posix_acl,
3271 SMB_ACL_T def_acl,
3272 uint32_t security_info,
3273 TALLOC_CTX *mem_ctx,
3274 struct security_descriptor **ppdesc)
3275 {
3276 struct dom_sid owner_sid;
3277 struct dom_sid group_sid;
3278 size_t sd_size = 0;
3279 struct security_acl *psa = NULL;
3280 size_t num_acls = 0;
3281 size_t num_def_acls = 0;
3282 size_t num_aces = 0;
3283 canon_ace *file_ace = NULL;
3284 canon_ace *dir_ace = NULL;
3285 struct security_ace *nt_ace_list = NULL;
3286 size_t num_profile_acls = 0;
3287 struct dom_sid orig_owner_sid;
3288 struct security_descriptor *psd = NULL;
3289 int i;
3290
3291 /*
3292 * Get the owner, group and world SIDs.
3293 */
3294
3295 create_file_sids(sbuf, &owner_sid, &group_sid);
3296
3297 if (lp_profile_acls(SNUM(conn))) {
3298 /* For WXP SP1 the owner must be administrators. */
3299 sid_copy(&orig_owner_sid, &owner_sid);
3300 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3301 sid_copy(&group_sid, &global_sid_Builtin_Users);
3302 num_profile_acls = 3;
3303 }
3304
3305 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3306
3307 /*
3308 * In the optimum case Creator Owner and Creator Group would be used for
3309 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3310 * would lead to usability problems under Windows: The Creator entries
3311 * are only available in browse lists of directories and not for files;
3312 * additionally the identity of the owning group couldn't be determined.
3313 * We therefore use those identities only for Default ACLs.
3314 */
3315
3316 /* Create the canon_ace lists. */
3317 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3318 &owner_sid, &group_sid, pal,
3319 SMB_ACL_TYPE_ACCESS);
3320
3321 /* We must have *some* ACLS. */
3322
3323 if (count_canon_ace_list(file_ace) == 0) {
3324 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3325 goto done;
3326 }
3327
3328 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3329 dir_ace = canonicalise_acl(conn, name, def_acl,
3330 sbuf,
3331 &global_sid_Creator_Owner,
3332 &global_sid_Creator_Group,
3333 pal, SMB_ACL_TYPE_DEFAULT);
3334 }
3335
3336 /*
3337 * Create the NT ACE list from the canonical ace lists.
3338 */
3339
3340 {
3341 canon_ace *ace;
3342 enum security_ace_type nt_acl_type;
3343
3344 num_acls = count_canon_ace_list(file_ace);
3345 num_def_acls = count_canon_ace_list(dir_ace);
3346
3347 /* Allocate the ace list. */
3348 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3349 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3350 goto done;
3351 }
3352
3353 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3354
3355 /*
3356 * Create the NT ACE list from the canonical ace lists.
3357 */
3358
3359 for (ace = file_ace; ace != NULL; ace = ace->next) {
3360 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3361 &nt_acl_type,
3362 ace->perms,
3363 S_ISDIR(sbuf->st_ex_mode));
3364 init_sec_ace(&nt_ace_list[num_aces++],
3365 &ace->trustee,
3366 nt_acl_type,
3367 acc,
3368 ace->ace_flags);
3369 }
3370
3371 /* The User must have access to a profile share - even
3372 * if we can't map the SID. */
3373 if (lp_profile_acls(SNUM(conn))) {
3374 add_or_replace_ace(nt_ace_list, &num_aces,
3375 &global_sid_Builtin_Users,
3376 SEC_ACE_TYPE_ACCESS_ALLOWED,
3377 FILE_GENERIC_ALL, 0);
3378 }
3379
3380 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3381 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3382 &nt_acl_type,
3383 ace->perms,
3384 S_ISDIR(sbuf->st_ex_mode));
3385 init_sec_ace(&nt_ace_list[num_aces++],
3386 &ace->trustee,
3387 nt_acl_type,
3388 acc,
3389 ace->ace_flags |
3390 SEC_ACE_FLAG_OBJECT_INHERIT|
3391 SEC_ACE_FLAG_CONTAINER_INHERIT|
3392 SEC_ACE_FLAG_INHERIT_ONLY);
3393 }
3394
3395 /* The User must have access to a profile share - even
3396 * if we can't map the SID. */
3397 if (lp_profile_acls(SNUM(conn))) {
3398 add_or_replace_ace(nt_ace_list, &num_aces,
3399 &global_sid_Builtin_Users,
3400 SEC_ACE_TYPE_ACCESS_ALLOWED,
3401 FILE_GENERIC_ALL,
3402 SEC_ACE_FLAG_OBJECT_INHERIT |
3403 SEC_ACE_FLAG_CONTAINER_INHERIT |
3404 SEC_ACE_FLAG_INHERIT_ONLY);
3405 }
3406
3407 /*
3408 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3409 * Win2K needs this to get the inheritance correct when replacing ACLs
3410 * on a directory tree. Based on work by Jim @ IBM.
3411 */
3412
3413 num_aces = merge_default_aces(nt_ace_list, num_aces);
3414
3415 if (lp_profile_acls(SNUM(conn))) {
3416 for (i = 0; i < num_aces; i++) {
3417 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3418 add_or_replace_ace(nt_ace_list, &num_aces,
3419 &orig_owner_sid,
3420 nt_ace_list[i].type,
3421 nt_ace_list[i].access_mask,
3422 nt_ace_list[i].flags);
3423 break;
3424 }
3425 }
3426 }
3427 }
3428
3429 if (num_aces) {
3430 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3431 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3432 goto done;
3433 }
3434 }
3435 } /* security_info & SECINFO_DACL */
3436
3437 psd = make_standard_sec_desc(mem_ctx,
3438 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3439 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3440 psa,
3441 &sd_size);
3442
3443 if(!psd) {
3444 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3445 sd_size = 0;
3446 goto done;
3447 }
3448
3449 /*
3450 * Windows 2000: The DACL_PROTECTED flag in the security
3451 * descriptor marks the ACL as non-inheriting, i.e., no
3452 * ACEs from higher level directories propagate to this
3453 * ACL. In the POSIX ACL model permissions are only
3454 * inherited at file create time, so ACLs never contain
3455 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3456 * flag doesn't seem to bother Windows NT.
3457 * Always set this if map acl inherit is turned off.
3458 */
3459 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3460 psd->type |= SEC_DESC_DACL_PROTECTED;
3461 } else {
3462 psd->type |= pal->sd_type;
3463 }
3464
3465 if (psd->dacl) {
3466 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3467 }
3468
3469 *ppdesc = psd;
3470
3471 done:
3472
3473 if (posix_acl) {
3474 TALLOC_FREE(posix_acl);
3475 }
3476 if (def_acl) {
3477 TALLOC_FREE(def_acl);
3478 }
3479 free_canon_ace_list(file_ace);
3480 free_canon_ace_list(dir_ace);
3481 free_inherited_info(pal);
3482 TALLOC_FREE(nt_ace_list);
3483
3484 return NT_STATUS_OK;
3485 }
3486
3487 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3488 TALLOC_CTX *mem_ctx,
3489 struct security_descriptor **ppdesc)
3490 {
3491 SMB_STRUCT_STAT sbuf;
3492 SMB_ACL_T posix_acl = NULL;
3493 struct pai_val *pal;
3494 TALLOC_CTX *frame = talloc_stackframe();
3495 NTSTATUS status;
3496
3497 *ppdesc = NULL;
3498
3499 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3500 fsp_str_dbg(fsp)));
3501
3502 /* can it happen that fsp_name == NULL ? */
3503 if (fsp->is_directory || fsp->fh->fd == -1) {
3504 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3505 security_info, mem_ctx, ppdesc);
3506 TALLOC_FREE(frame);
3507 return status;
3508 }
3509
3510 /* Get the stat struct for the owner info. */
3511 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3512 TALLOC_FREE(frame);
3513 return map_nt_error_from_unix(errno);
3514 }
3515
3516 /* Get the ACL from the fd. */
3517 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3518
3519 pal = fload_inherited_info(fsp);
3520
3521 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3522 &sbuf, pal, posix_acl, NULL,
3523 security_info, mem_ctx, ppdesc);
3524 TALLOC_FREE(frame);
3525 return status;
3526 }
3527
3528 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3529 uint32_t security_info,
3530 TALLOC_CTX *mem_ctx,
3531 struct security_descriptor **ppdesc)
3532 {
3533 SMB_ACL_T posix_acl = NULL;
3534 SMB_ACL_T def_acl = NULL;
3535 struct pai_val *pal;
3536 struct smb_filename smb_fname;
3537 int ret;
3538 TALLOC_CTX *frame = talloc_stackframe();
3539 NTSTATUS status;
3540
3541 *ppdesc = NULL;
3542
3543 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3544
3545 ZERO_STRUCT(smb_fname);
3546 smb_fname.base_name = discard_const_p(char, name);
3547
3548 /* Get the stat struct for the owner info. */
3549 if (lp_posix_pathnames()) {
3550 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3551 } else {
3552 ret = SMB_VFS_STAT(conn, &smb_fname);
3553 }
3554
3555 if (ret == -1) {
3556 TALLOC_FREE(frame);
3557 return map_nt_error_from_unix(errno);
3558 }
3559
3560 /* Get the ACL from the path. */
3561 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3562 SMB_ACL_TYPE_ACCESS, frame);
3563
3564 /* If it's a directory get the default POSIX ACL. */
3565 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3566 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3567 SMB_ACL_TYPE_DEFAULT, frame);
3568 def_acl = free_empty_sys_acl(conn, def_acl);
3569 }
3570
3571 pal = load_inherited_info(conn, name);
3572
3573 status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3574 posix_acl, def_acl, security_info,
3575 mem_ctx,
3576 ppdesc);
3577 TALLOC_FREE(frame);
3578 return status;
3579 }
3580
3581 /****************************************************************************
3582 Try to chown a file. We will be able to chown it under the following conditions.
3583
3584 1) If we have root privileges, then it will just work.
3585 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3586 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3587 4) If we have write permission to the file and dos_filemodes is set
3588 then allow chown to the currently authenticated user.
3589 ****************************************************************************/
3590
3591 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3592 {
3593 NTSTATUS status;
3594
3595 if(!CAN_WRITE(fsp->conn)) {
3596 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3597 }
3598
3599 /* Case (1). */
3600 status = vfs_chown_fsp(fsp, uid, gid);
3601 if (NT_STATUS_IS_OK(status)) {
3602 return status;
3603 }
3604
3605 /* Case (2) / (3) */
3606 if (lp_enable_privileges()) {
3607 bool has_take_ownership_priv = security_token_has_privilege(
3608 get_current_nttok(fsp->conn),
3609 SEC_PRIV_TAKE_OWNERSHIP);
3610 bool has_restore_priv = security_token_has_privilege(
3611 get_current_nttok(fsp->conn),
3612 SEC_PRIV_RESTORE);
3613
3614 if (has_restore_priv) {
3615 ; /* Case (2) */
3616 } else if (has_take_ownership_priv) {
3617 /* Case (3) */
3618 if (uid == get_current_uid(fsp->conn)) {
3619 gid = (gid_t)-1;
3620 } else {
3621 has_take_ownership_priv = false;
3622 }
3623 }
3624
3625 if (has_take_ownership_priv || has_restore_priv) {
3626 become_root();
3627 status = vfs_chown_fsp(fsp, uid, gid);
3628 unbecome_root();
3629 return status;
3630 }
3631 }
3632
3633 /* Case (4). */
3634 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3635 return NT_STATUS_ACCESS_DENIED;
3636 }
3637
3638 /* only allow chown to the current user. This is more secure,
3639 and also copes with the case where the SID in a take ownership ACL is
3640 a local SID on the users workstation
3641 */
3642 if (uid != get_current_uid(fsp->conn)) {
3643 return NT_STATUS_ACCESS_DENIED;
3644 }
3645
3646 become_root();
3647 /* Keep the current file gid the same. */
3648 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3649 unbecome_root();
3650
3651 return status;
3652 }
3653
3654 /****************************************************************************
3655 Reply to set a security descriptor on an fsp. security_info_sent is the
3656 description of the following NT ACL.
3657 This should be the only external function needed for the UNIX style set ACL.
3658 We make a copy of psd_orig as internal functions modify the elements inside
3659 it, even though it's a const pointer.
3660 ****************************************************************************/
3661
3662 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3663 {
3664 connection_struct *conn = fsp->conn;
3665 uid_t user = (uid_t)-1;
3666 gid_t grp = (gid_t)-1;
3667 struct dom_sid file_owner_sid;
3668 struct dom_sid file_grp_sid;
3669 canon_ace *file_ace_list = NULL;
3670 canon_ace *dir_ace_list = NULL;
3671 bool acl_perms = False;
3672 mode_t orig_mode = (mode_t)0;
3673 NTSTATUS status;
3674 bool set_acl_as_root = false;
3675 bool acl_set_support = false;
3676 bool ret = false;
3677 struct security_descriptor *psd = NULL;
3678
3679 DEBUG(10,("set_nt_acl: called for file %s\n",
3680 fsp_str_dbg(fsp)));
3681
3682 if (!CAN_WRITE(conn)) {
3683 DEBUG(10,("set acl rejected on read-only share\n"));
3684 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3685 }
3686
3687 if (!psd_orig) {
3688 return NT_STATUS_INVALID_PARAMETER;
3689 }
3690
3691 psd = dup_sec_desc(talloc_tos(), psd_orig);
3692 if (!psd) {
3693 return NT_STATUS_NO_MEMORY;
3694 }
3695
3696 /*
3697 * Get the current state of the file.
3698 */
3699
3700 status = vfs_stat_fsp(fsp);
3701 if (!NT_STATUS_IS_OK(status)) {
3702 return status;
3703 }
3704
3705 /* Save the original element we check against. */
3706 orig_mode = fsp->fsp_name->st.st_ex_mode;
3707
3708 /*
3709 * Unpack the user/group/world id's.
3710 */
3711
3712 /* POSIX can't cope with missing owner/group. */
3713 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3714 security_info_sent &= ~SECINFO_OWNER;
3715 }
3716 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3717 security_info_sent &= ~SECINFO_GROUP;
3718 }
3719
3720 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3721 if (!NT_STATUS_IS_OK(status)) {
3722 return status;
3723 }
3724
3725 /*
3726 * Do we need to chown ? If so this must be done first as the incoming
3727 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3728 * Noticed by Simo.
3729 */
3730
3731 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3732 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3733
3734 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3735 fsp_str_dbg(fsp), (unsigned int)user,
3736 (unsigned int)grp));
3737
3738 status = try_chown(fsp, user, grp);
3739 if(!NT_STATUS_IS_OK(status)) {
3740 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3741 "= %s.\n", fsp_str_dbg(fsp),
3742 (unsigned int)user,
3743 (unsigned int)grp,
3744 nt_errstr(status)));
3745 return status;
3746 }
3747
3748 /*
3749 * Recheck the current state of the file, which may have changed.
3750 * (suid/sgid bits, for instance)
3751 */
3752
3753 status = vfs_stat_fsp(fsp);
3754 if (!NT_STATUS_IS_OK(status)) {
3755 return status;
3756 }
3757
3758 /* Save the original element we check against. */
3759 orig_mode = fsp->fsp_name->st.st_ex_mode;
3760
3761 /* If we successfully chowned, we know we must
3762 * be able to set the acl, so do it as root.
3763 */
3764 set_acl_as_root = true;
3765 }
3766
3767 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3768
3769 if((security_info_sent & SECINFO_DACL) &&
3770 (psd->type & SEC_DESC_DACL_PRESENT) &&
3771 (psd->dacl == NULL)) {
3772 struct security_ace ace[3];
3773
3774 /* We can't have NULL DACL in POSIX.
3775 Use owner/group/Everyone -> full access. */
3776
3777 init_sec_ace(&ace[0],
3778 &file_owner_sid,
3779 SEC_ACE_TYPE_ACCESS_ALLOWED,
3780 GENERIC_ALL_ACCESS,
3781 0);
3782 init_sec_ace(&ace[1],
3783 &file_grp_sid,
3784 SEC_ACE_TYPE_ACCESS_ALLOWED,
3785 GENERIC_ALL_ACCESS,
3786 0);
3787 init_sec_ace(&ace[2],
3788 &global_sid_World,
3789 SEC_ACE_TYPE_ACCESS_ALLOWED,
3790 GENERIC_ALL_ACCESS,
3791 0);
3792 psd->dacl = make_sec_acl(talloc_tos(),
3793 NT4_ACL_REVISION,
3794 3,
3795 ace);
3796 if (psd->dacl == NULL) {
3797 return NT_STATUS_NO_MEMORY;
3798 }
3799 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3800 }
3801
3802 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3803 &file_grp_sid, &file_ace_list,
3804 &dir_ace_list, security_info_sent, psd);
3805
3806 /* Ignore W2K traverse DACL set. */
3807 if (!file_ace_list && !dir_ace_list) {
3808 return NT_STATUS_OK;
3809 }
3810
3811 if (!acl_perms) {
3812 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3813 free_canon_ace_list(file_ace_list);
3814 free_canon_ace_list(dir_ace_list);
3815 return NT_STATUS_ACCESS_DENIED;
3816 }
3817
3818 /*
3819 * Only change security if we got a DACL.
3820 */
3821
3822 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3823 free_canon_ace_list(file_ace_list);
3824 free_canon_ace_list(dir_ace_list);
3825 return NT_STATUS_OK;
3826 }
3827
3828 /*
3829 * Try using the POSIX ACL set first. Fall back to chmod if
3830 * we have no ACL support on this filesystem.
3831 */
3832
3833 if (acl_perms && file_ace_list) {
3834 if (set_acl_as_root) {
3835 become_root();
3836 }
3837 ret = set_canon_ace_list(fsp, file_ace_list, false,
3838 &fsp->fsp_name->st, &acl_set_support);
3839 if (set_acl_as_root) {
3840 unbecome_root();
3841 }
3842 if (acl_set_support && ret == false) {
3843 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3844 "%s (%s).\n", fsp_str_dbg(fsp),
3845 strerror(errno)));
3846 free_canon_ace_list(file_ace_list);
3847 free_canon_ace_list(dir_ace_list);
3848 return map_nt_error_from_unix(errno);
3849 }
3850 }
3851
3852 if (acl_perms && acl_set_support && fsp->is_directory) {
3853 if (dir_ace_list) {
3854 if (set_acl_as_root) {
3855 become_root();
3856 }
3857 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3858 &fsp->fsp_name->st,
3859 &acl_set_support);
3860 if (set_acl_as_root) {
3861 unbecome_root();
3862 }
3863 if (ret == false) {
3864 DEBUG(3,("set_nt_acl: failed to set default "
3865 "acl on directory %s (%s).\n",
3866 fsp_str_dbg(fsp), strerror(errno)));
3867 free_canon_ace_list(file_ace_list);
3868 free_canon_ace_list(dir_ace_list);
3869 return map_nt_error_from_unix(errno);
3870 }
3871 } else {
3872 int sret = -1;
3873
3874 /*
3875 * No default ACL - delete one if it exists.
3876 */
3877
3878 if (set_acl_as_root) {
3879 become_root();
3880 }
3881 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3882 fsp->fsp_name->base_name);
3883 if (set_acl_as_root) {
3884 unbecome_root();
3885 }
3886 if (sret == -1) {
3887 if (acl_group_override(conn, fsp->fsp_name)) {
3888 DEBUG(5,("set_nt_acl: acl group "
3889 "control on and current user "
3890 "in file %s primary group. "
3891 "Override delete_def_acl\n",
3892 fsp_str_dbg(fsp)));
3893
3894 become_root();
3895 sret =
3896 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3897 conn,
3898 fsp->fsp_name->base_name);
3899 unbecome_root();
3900 }
3901
3902 if (sret == -1) {
3903 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3904 free_canon_ace_list(file_ace_list);
3905 free_canon_ace_list(dir_ace_list);
3906 return map_nt_error_from_unix(errno);
3907 }
3908 }
3909 }
3910 }
3911
3912 if (acl_set_support) {
3913 if (set_acl_as_root) {
3914 become_root();
3915 }
3916 store_inheritance_attributes(fsp,
3917 file_ace_list,
3918 dir_ace_list,
3919 psd->type);
3920 if (set_acl_as_root) {
3921 unbecome_root();
3922 }
3923 }
3924
3925 /*
3926 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3927 */
3928
3929 if(!acl_set_support && acl_perms) {
3930 mode_t posix_perms;
3931
3932 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3933 free_canon_ace_list(file_ace_list);
3934 free_canon_ace_list(dir_ace_list);
3935 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3936 "posix permissions for file %s.\n",
3937 fsp_str_dbg(fsp)));
3938 return NT_STATUS_ACCESS_DENIED;
3939 }
3940
3941 if (orig_mode != posix_perms) {
3942 int sret = -1;
3943
3944 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3945 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3946
3947 if (set_acl_as_root) {
3948 become_root();
3949 }
3950 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
3951 posix_perms);
3952 if (set_acl_as_root) {
3953 unbecome_root();
3954 }
3955 if(sret == -1) {
3956 if (acl_group_override(conn, fsp->fsp_name)) {
3957 DEBUG(5,("set_nt_acl: acl group "
3958 "control on and current user "
3959 "in file %s primary group. "
3960 "Override chmod\n",
3961 fsp_str_dbg(fsp)));
3962
3963 become_root();
3964 sret = SMB_VFS_CHMOD(conn,
3965 fsp->fsp_name->base_name,
3966 posix_perms);
3967 unbecome_root();
3968 }
3969
3970 if (sret == -1) {
3971 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3972 "failed. Error = %s.\n",
3973 fsp_str_dbg(fsp),
3974 (unsigned int)posix_perms,
3975 strerror(errno)));
3976 free_canon_ace_list(file_ace_list);
3977 free_canon_ace_list(dir_ace_list);
3978 return map_nt_error_from_unix(errno);
3979 }
3980 }
3981 }
3982 }
3983
3984 free_canon_ace_list(file_ace_list);
3985 free_canon_ace_list(dir_ace_list);
3986
3987 /* Ensure the stat struct in the fsp is correct. */
3988 status = vfs_stat_fsp(fsp);
3989
3990 return NT_STATUS_OK;
3991 }
3992
3993 /****************************************************************************
3994 Get the actual group bits stored on a file with an ACL. Has no effect if
3995 the file has no ACL. Needed in dosmode code where the stat() will return
3996 the mask bits, not the real group bits, for a file with an ACL.
3997 ****************************************************************************/
3998
3999 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4000 {
4001 int entry_id = SMB_ACL_FIRST_ENTRY;
4002 SMB_ACL_ENTRY_T entry;
4003 SMB_ACL_T posix_acl;
4004 int result = -1;
4005
4006 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4007 SMB_ACL_TYPE_ACCESS, talloc_tos());
4008 if (posix_acl == (SMB_ACL_T)NULL)
4009 return -1;
4010
4011 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4012 SMB_ACL_TAG_T tagtype;
4013 SMB_ACL_PERMSET_T permset;
4014
4015 entry_id = SMB_ACL_NEXT_ENTRY;
4016
4017 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4018 break;
4019
4020 if (tagtype == SMB_ACL_GROUP_OBJ) {
4021 if (sys_acl_get_permset(entry, &permset) == -1) {
4022 break;
4023 } else {
4024 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4025 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4026 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4027 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4028 result = 0;
4029 break;
4030 }
4031 }
4032 }
4033 TALLOC_FREE(posix_acl);
4034 return result;
4035 }
4036
4037 /****************************************************************************
4038 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4039 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4040 ****************************************************************************/
4041
4042 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4043 {
4044 int entry_id = SMB_ACL_FIRST_ENTRY;
4045 SMB_ACL_ENTRY_T entry;
4046 int num_entries = 0;
4047
4048 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4049 SMB_ACL_TAG_T tagtype;
4050 SMB_ACL_PERMSET_T permset;
4051 mode_t perms;
4052
4053 entry_id = SMB_ACL_NEXT_ENTRY;
4054
4055 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4056 return -1;
4057
4058 if (sys_acl_get_permset(entry, &permset) == -1)
4059 return -1;
4060
4061 num_entries++;
4062
4063 switch(tagtype) {
4064 case SMB_ACL_USER_OBJ:
4065 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4066 break;
4067 case SMB_ACL_GROUP_OBJ:
4068 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4069 break;
4070 case SMB_ACL_MASK:
4071 /*
4072 * FIXME: The ACL_MASK entry permissions should really be set to
4073 * the union of the permissions of all ACL_USER,
4074 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4075 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4076 */
4077 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4078 break;
4079 case SMB_ACL_OTHER:
4080 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4081 break;
4082 default:
4083 continue;
4084 }
4085
4086 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4087 return -1;
4088
4089 if (sys_acl_set_permset(entry, permset) == -1)
4090 return -1;
4091 }
4092
4093 /*
4094 * If this is a simple 3 element ACL or no elements then it's a standard
4095 * UNIX permission set. Just use chmod...
4096 */
4097
4098 if ((num_entries == 3) || (num_entries == 0))
4099 return -1;
4100
4101 return 0;
4102 }
4103
4104 /****************************************************************************
4105 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4106 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4107 resulting ACL on TO. Note that name is in UNIX character set.
4108 ****************************************************************************/
4109
4110 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4111 {
4112 SMB_ACL_T posix_acl = NULL;
4113 int ret = -1;
4114
4115 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4116 SMB_ACL_TYPE_ACCESS,
4117 talloc_tos())) == NULL)
4118 return -1;
4119
4120 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4121 goto done;
4122
4123 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4124
4125 done:
4126
4127 TALLOC_FREE(posix_acl);
4128 return ret;
4129 }
4130
4131 /****************************************************************************
4132 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4133 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4134 Note that name is in UNIX character set.
4135 ****************************************************************************/
4136
4137 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4138 {
4139 return copy_access_posix_acl(conn, name, name, mode);
4140 }
4141
4142 /****************************************************************************
4143 Check for an existing default POSIX ACL on a directory.
4144 ****************************************************************************/
4145
4146 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4147 {
4148 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4149 SMB_ACL_TYPE_DEFAULT,
4150 talloc_tos());
4151 bool has_acl = False;
4152 SMB_ACL_ENTRY_T entry;
4153
4154 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4155 has_acl = True;
4156 }
4157
4158 if (def_acl) {
4159 TALLOC_FREE(def_acl);
4160 }
4161 return has_acl;
4162 }
4163
4164 /****************************************************************************
4165 If the parent directory has no default ACL but it does have an Access ACL,
4166 inherit this Access ACL to file name.
4167 ****************************************************************************/
4168
4169 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4170 const char *name, mode_t mode)
4171 {
4172 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4173 return 0;
4174
4175 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4176 }
4177
4178 /****************************************************************************
4179 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4180 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4181 ****************************************************************************/
4182
4183 int fchmod_acl(files_struct *fsp, mode_t mode)
4184 {
4185 connection_struct *conn = fsp->conn;
4186 SMB_ACL_T posix_acl = NULL;
4187 int ret = -1;
4188
4189 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4190 return -1;
4191
4192 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4193 goto done;
4194
4195 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4196
4197 done:
4198
4199 TALLOC_FREE(posix_acl);
4200 return ret;
4201 }
4202
4203 /****************************************************************************
4204 Map from wire type to permset.
4205 ****************************************************************************/
4206
4207 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4208 {
4209 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4210 return False;
4211 }
4212
4213 if (sys_acl_clear_perms(*p_permset) == -1) {
4214 return False;
4215 }
4216
4217 if (wire_perm & SMB_POSIX_ACL_READ) {
4218 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4219 return False;
4220 }
4221 }
4222 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4223 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4224 return False;
4225 }
4226 }
4227 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4228 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4229 return False;
4230 }
4231 }
4232 return True;
4233 }
4234
4235 /****************************************************************************
4236 Map from wire type to tagtype.
4237 ****************************************************************************/
4238
4239 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4240 {
4241 switch (wire_tt) {
4242 case SMB_POSIX_ACL_USER_OBJ:
4243 *p_tt = SMB_ACL_USER_OBJ;
4244 break;
4245 case SMB_POSIX_ACL_USER:
4246 *p_tt = SMB_ACL_USER;
4247 break;
4248 case SMB_POSIX_ACL_GROUP_OBJ:
4249 *p_tt = SMB_ACL_GROUP_OBJ;
4250 break;
4251 case SMB_POSIX_ACL_GROUP:
4252 *p_tt = SMB_ACL_GROUP;
4253 break;
4254 case SMB_POSIX_ACL_MASK:
4255 *p_tt = SMB_ACL_MASK;
4256 break;
4257 case SMB_POSIX_ACL_OTHER:
4258 *p_tt = SMB_ACL_OTHER;
4259 break;
4260 default:
4261 return False;
4262 }
4263 return True;
4264 }
4265
4266 /****************************************************************************
4267 Create a new POSIX acl from wire permissions.
4268 FIXME ! How does the share mask/mode fit into this.... ?
4269 ****************************************************************************/
4270
4271 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4272 uint16 num_acls,
4273 const char *pdata,
4274 TALLOC_CTX *mem_ctx)
4275 {
4276 unsigned int i;
4277 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4278
4279 if (the_acl == NULL) {
4280 return NULL;
4281 }
4282
4283 for (i = 0; i < num_acls; i++) {
4284 SMB_ACL_ENTRY_T the_entry;
4285 SMB_ACL_PERMSET_T the_permset;
4286 SMB_ACL_TAG_T tag_type;
4287
4288 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4289 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4290 i, strerror(errno) ));
4291 goto fail;
4292 }
4293
4294 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4295 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4296 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4297 goto fail;
4298 }
4299
4300 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4301 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4302 i, strerror(errno) ));
4303 goto fail;
4304 }
4305
4306 /* Get the permset pointer from the new ACL entry. */
4307 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4308 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4309 i, strerror(errno) ));
4310 goto fail;
4311 }
4312
4313 /* Map from wire to permissions. */
4314 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4315 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4316 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4317 goto fail;
4318 }
4319
4320 /* Now apply to the new ACL entry. */
4321 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4322 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4323 i, strerror(errno) ));
4324 goto fail;
4325 }
4326
4327 if (tag_type == SMB_ACL_USER) {
4328 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4329 uid_t uid = (uid_t)uidval;
4330 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4331 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4332 (unsigned int)uid, i, strerror(errno) ));
4333 goto fail;
4334 }
4335 }
4336
4337 if (tag_type == SMB_ACL_GROUP) {
4338 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4339 gid_t gid = (uid_t)gidval;
4340 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4341 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4342 (unsigned int)gid, i, strerror(errno) ));
4343 goto fail;
4344 }
4345 }
4346 }
4347
4348 return the_acl;
4349
4350 fail:
4351
4352 if (the_acl != NULL) {
4353 TALLOC_FREE(the_acl);
4354 }
4355 return NULL;
4356 }
4357
4358 /****************************************************************************
4359 Calls from UNIX extensions - Default POSIX ACL set.
4360 If num_def_acls == 0 and not a directory just return. If it is a directory
4361 and num_def_acls == 0 then remove the default acl. Else set the default acl
4362 on the directory.
4363 ****************************************************************************/
4364
4365 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4366 uint16 num_def_acls, const char *pdata)
4367 {
4368 SMB_ACL_T def_acl = NULL;
4369
4370 if (!S_ISDIR(psbuf->st_ex_mode)) {
4371 if (num_def_acls) {
4372 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4373 errno = EISDIR;
4374 return False;
4375 } else {
4376 return True;
4377 }
4378 }
4379
4380 if (!num_def_acls) {
4381 /* Remove the default ACL. */
4382 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4383 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4384 fname, strerror(errno) ));
4385 return False;
4386 }
4387 return True;
4388 }
4389
4390 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4391 pdata,
4392 talloc_tos())) == NULL) {
4393 return False;
4394 }
4395
4396 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4397 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4398 fname, strerror(errno) ));
4399 TALLOC_FREE(def_acl);
4400 return False;
4401 }
4402
4403 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4404 TALLOC_FREE(def_acl);
4405 return True;
4406 }
4407
4408 /****************************************************************************
4409 Remove an ACL from a file. As we don't have acl_delete_entry() available
4410 we must read the current acl and copy all entries except MASK, USER and GROUP
4411 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4412 removed.
4413 FIXME ! How does the share mask/mode fit into this.... ?
4414 ****************************************************************************/
4415
4416 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4417 {
4418 SMB_ACL_T file_acl = NULL;
4419 int entry_id = SMB_ACL_FIRST_ENTRY;
4420 SMB_ACL_ENTRY_T entry;
4421 bool ret = False;
4422 /* Create a new ACL with only 3 entries, u/g/w. */
4423 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4424 SMB_ACL_ENTRY_T user_ent = NULL;
4425 SMB_ACL_ENTRY_T group_ent = NULL;
4426 SMB_ACL_ENTRY_T other_ent = NULL;
4427
4428 if (new_file_acl == NULL) {
4429 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4430 return False;
4431 }
4432
4433 /* Now create the u/g/w entries. */
4434 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4435 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4436 fname, strerror(errno) ));
4437 goto done;
4438 }
4439 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4440 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4441 fname, strerror(errno) ));
4442 goto done;
4443 }
4444
4445 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4446 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4447 fname, strerror(errno) ));
4448 goto done;
4449 }
4450 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4451 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4452 fname, strerror(errno) ));
4453 goto done;
4454 }
4455
4456 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4457 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4458 fname, strerror(errno) ));
4459 goto done;
4460 }
4461 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4462 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4463 fname, strerror(errno) ));
4464 goto done;
4465 }
4466
4467 /* Get the current file ACL. */
4468 if (fsp && fsp->fh->fd != -1) {
4469 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4470 } else {
4471 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4472 SMB_ACL_TYPE_ACCESS,
4473 talloc_tos());
4474 }
4475
4476 if (file_acl == NULL) {
4477 /* This is only returned if an error occurred. Even for a file with
4478 no acl a u/g/w acl should be returned. */
4479 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4480 fname, strerror(errno) ));
4481 goto done;
4482 }
4483
4484 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4485 SMB_ACL_TAG_T tagtype;
4486 SMB_ACL_PERMSET_T permset;
4487
4488 entry_id = SMB_ACL_NEXT_ENTRY;
4489
4490 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4491 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4492 fname, strerror(errno) ));
4493 goto done;
4494 }
4495
4496 if (sys_acl_get_permset(entry, &permset) == -1) {
4497 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4498 fname, strerror(errno) ));
4499 goto done;
4500 }
4501
4502 if (tagtype == SMB_ACL_USER_OBJ) {
4503 if (sys_acl_set_permset(user_ent, permset) == -1) {
4504 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4505 fname, strerror(errno) ));
4506 }
4507 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4508 if (sys_acl_set_permset(group_ent, permset) == -1) {
4509 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4510 fname, strerror(errno) ));
4511 }
4512 } else if (tagtype == SMB_ACL_OTHER) {
4513 if (sys_acl_set_permset(other_ent, permset) == -1) {
4514 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4515 fname, strerror(errno) ));
4516 }
4517 }
4518 }
4519
4520 /* Set the new empty file ACL. */
4521 if (fsp && fsp->fh->fd != -1) {
4522 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4523 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4524 fname, strerror(errno) ));
4525 goto done;
4526 }
4527 } else {
4528 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4529 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4530 fname, strerror(errno) ));
4531 goto done;
4532 }
4533 }
4534
4535 ret = True;
4536
4537 done:
4538
4539 if (file_acl) {
4540 TALLOC_FREE(file_acl);
4541 }
4542 if (new_file_acl) {
4543 TALLOC_FREE(new_file_acl);
4544 }
4545 return ret;
4546 }
4547
4548 /****************************************************************************
4549 Calls from UNIX extensions - POSIX ACL set.
4550 If num_def_acls == 0 then read/modify/write acl after removing all entries
4551 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4552 ****************************************************************************/
4553
4554 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4555 {
4556 SMB_ACL_T file_acl = NULL;
4557
4558 if (!num_acls) {
4559 /* Remove the ACL from the file. */
4560 return remove_posix_acl(conn, fsp, fname);
4561 }
4562
4563 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4564 pdata,
4565 talloc_tos())) == NULL) {
4566 return False;
4567 }
4568
4569 if (fsp && fsp->fh->fd != -1) {
4570 /* The preferred way - use an open fd. */
4571 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4572 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4573 fname, strerror(errno) ));
4574 TALLOC_FREE(file_acl);
4575 return False;
4576 }
4577 } else {
4578 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4579 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4580 fname, strerror(errno) ));
4581 TALLOC_FREE(file_acl);
4582 return False;
4583 }
4584 }
4585
4586 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4587 TALLOC_FREE(file_acl);
4588 return True;
4589 }
4590
4591 /********************************************************************
4592 Pull the NT ACL from a file on disk or the OpenEventlog() access
4593 check. Caller is responsible for freeing the returned security
4594 descriptor via TALLOC_FREE(). This is designed for dealing with
4595 user space access checks in smbd outside of the VFS. For example,
4596 checking access rights in OpenEventlog() or from python.
4597
4598 ********************************************************************/
4599
4600 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4601 uint32 security_info_wanted,
4602 struct security_descriptor **sd)
4603 {
4604 TALLOC_CTX *frame = talloc_stackframe();
4605 connection_struct *conn;
4606 NTSTATUS status = NT_STATUS_OK;
4607
4608 if (!posix_locking_init(false)) {
4609 TALLOC_FREE(frame);
4610 return NT_STATUS_NO_MEMORY;
4611 }
4612
4613 status = create_conn_struct(ctx,
4614 server_event_context(),
4615 server_messaging_context(),
4616 &conn,
4617 -1,
4618 "/",
4619 NULL);
4620
4621 if (!NT_STATUS_IS_OK(status)) {
4622 DEBUG(0,("create_conn_struct returned %s.\n",
4623 nt_errstr(status)));
4624 TALLOC_FREE(frame);
4625 return status;
4626 }
4627
4628 status = SMB_VFS_GET_NT_ACL(conn, fname, security_info_wanted, ctx, sd);
4629 if (!NT_STATUS_IS_OK(status)) {
4630 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4631 nt_errstr(status)));
4632 }
4633
4634 conn_free(conn);
4635 TALLOC_FREE(frame);
4636
4637 return status;
4638 }
4639
4640 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4641
4642 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4643 const char *name,
4644 SMB_STRUCT_STAT *psbuf,
4645 struct security_descriptor **ppdesc)
4646 {
4647 struct dom_sid owner_sid, group_sid;
4648 size_t size = 0;
4649 struct security_ace aces[4];
4650 uint32_t access_mask = 0;
4651 mode_t mode = psbuf->st_ex_mode;
4652 struct security_acl *new_dacl = NULL;
4653 int idx = 0;
4654
4655 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4656 name, (int)mode ));
4657
4658 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4659 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4660
4661 /*
4662 We provide up to 4 ACEs
4663 - Owner
4664 - Group
4665 - Everyone
4666 - NT System
4667 */
4668
4669 if (mode & S_IRUSR) {
4670 if (mode & S_IWUSR) {
4671 access_mask |= SEC_RIGHTS_FILE_ALL;
4672 } else {
4673 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4674 }
4675 }
4676 if (mode & S_IWUSR) {
4677 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4678 }
4679
4680 init_sec_ace(&aces[idx],
4681 &owner_sid,
4682 SEC_ACE_TYPE_ACCESS_ALLOWED,
4683 access_mask,
4684 0);
4685 idx++;
4686
4687 access_mask = 0;
4688 if (mode & S_IRGRP) {
4689 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4690 }
4691 if (mode & S_IWGRP) {
4692 /* note that delete is not granted - this matches posix behaviour */
4693 access_mask |= SEC_RIGHTS_FILE_WRITE;
4694 }
4695 if (access_mask) {
4696 init_sec_ace(&aces[idx],
4697 &group_sid,
4698 SEC_ACE_TYPE_ACCESS_ALLOWED,
4699 access_mask,
4700 0);
4701 idx++;
4702 }
4703
4704 access_mask = 0;
4705 if (mode & S_IROTH) {
4706 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4707 }
4708 if (mode & S_IWOTH) {
4709 access_mask |= SEC_RIGHTS_FILE_WRITE;
4710 }
4711 if (access_mask) {
4712 init_sec_ace(&aces[idx],
4713 &global_sid_World,
4714 SEC_ACE_TYPE_ACCESS_ALLOWED,
4715 access_mask,
4716 0);
4717 idx++;
4718 }
4719
4720 init_sec_ace(&aces[idx],
4721 &global_sid_System,
4722 SEC_ACE_TYPE_ACCESS_ALLOWED,
4723 SEC_RIGHTS_FILE_ALL,
4724 0);
4725 idx++;
4726
4727 new_dacl = make_sec_acl(ctx,
4728 NT4_ACL_REVISION,
4729 idx,
4730 aces);
4731
4732 if (!new_dacl) {
4733 return NT_STATUS_NO_MEMORY;
4734 }
4735
4736 *ppdesc = make_sec_desc(ctx,
4737 SECURITY_DESCRIPTOR_REVISION_1,
4738 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4739 &owner_sid,
4740 &group_sid,
4741 NULL,
4742 new_dacl,
4743 &size);
4744 if (!*ppdesc) {
4745 return NT_STATUS_NO_MEMORY;
4746 }
4747 return NT_STATUS_OK;
4748 }
4749
4750 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4751 const char *path_p,
4752 TALLOC_CTX *mem_ctx,
4753 char **blob_description,
4754 DATA_BLOB *blob)
4755 {
4756 int ret;
4757 TALLOC_CTX *frame = talloc_stackframe();
4758 struct smb_acl_wrapper acl_wrapper = {};
4759 struct smb_filename *smb_fname = NULL;
4760 NTSTATUS status = create_synthetic_smb_fname_split(frame, path_p,
4761 NULL,
4762 &smb_fname);
4763 if (!NT_STATUS_IS_OK(status)) {
4764 errno = map_errno_from_nt_status(status);
4765 TALLOC_FREE(frame);
4766 return -1;
4767 }
4768
4769 acl_wrapper.access_acl
4770 = smb_vfs_call_sys_acl_get_file(handle,
4771 path_p,
4772 SMB_ACL_TYPE_ACCESS,
4773 frame);
4774
4775 ret = smb_vfs_call_stat(handle, smb_fname);
4776 if (ret == -1) {
4777 TALLOC_FREE(frame);
4778 return -1;
4779 }
4780
4781 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4782 acl_wrapper.default_acl
4783 = smb_vfs_call_sys_acl_get_file(handle,
4784 path_p,
4785 SMB_ACL_TYPE_DEFAULT,
4786 frame);
4787 }
4788
4789 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4790 acl_wrapper.group = smb_fname->st.st_ex_gid;
4791 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4792
4793 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4794 &acl_wrapper,
4795 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4796 errno = EINVAL;
4797 TALLOC_FREE(frame);
4798 return -1;
4799 }
4800
4801 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4802 if (!*blob_description) {
4803 errno = EINVAL;
4804 TALLOC_FREE(frame);
4805 return -1;
4806 }
4807
4808 TALLOC_FREE(frame);
4809 return 0;
4810 }
4811
4812 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4813 files_struct *fsp,
4814 TALLOC_CTX *mem_ctx,
4815 char **blob_description,
4816 DATA_BLOB *blob)
4817 {
4818 SMB_STRUCT_STAT sbuf;
4819 TALLOC_CTX *frame;
4820 struct smb_acl_wrapper acl_wrapper;
4821 int ret;
4822
4823 /* This ensures that we also consider the default ACL */
4824 if (fsp->is_directory || fsp->fh->fd == -1) {
4825 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
4826 mem_ctx, blob_description, blob);
4827 }
4828 frame = talloc_stackframe();
4829
4830 acl_wrapper.default_acl = NULL;
4831
4832 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
4833 SMB_ACL_TYPE_ACCESS, frame);
4834
4835 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4836 if (ret == -1) {
4837 TALLOC_FREE(frame);
4838 return -1;
4839 }
4840
4841 acl_wrapper.owner = sbuf.st_ex_uid;
4842 acl_wrapper.group = sbuf.st_ex_gid;
4843 acl_wrapper.mode = sbuf.st_ex_mode;
4844
4845 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4846 &acl_wrapper,
4847 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4848 errno = EINVAL;
4849 TALLOC_FREE(frame);
4850 return -1;
4851 }
4852
4853 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4854 if (!*blob_description) {
4855 errno = EINVAL;
4856 TALLOC_FREE(frame);
4857 return -1;
4858 }
4859
4860 TALLOC_FREE(frame);
4861 return 0;
4862 }
reg import