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s3/torture: use stack buffer for rbtree loop
[Samba.git] / source3 / smbd / posix_acls.c
blobdb2d36a89a1e7f18dfdf9b3c3f0b0c7165d3bd37
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_t 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_t 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,
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_t num_entries;
342 uint16_t 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_t num_entries;
374 uint16_t 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 unsigned 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,
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 struct smb_filename *smb_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, smb_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",
720 (unsigned long)ret, smb_fname->base_name));
721
722 if (ret == -1) {
723 /* No attribute or not supported. */
724 #if defined(ENOATTR)
725 if (errno != ENOATTR)
726 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
727 #else
728 if (errno != ENOSYS)
729 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
730 #endif
731 TALLOC_FREE(pai_buf);
732 return NULL;
733 }
734
735 paiv = create_pai_val(pai_buf, ret);
736
737 if (paiv) {
738 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
739 (unsigned int)paiv->sd_type,
740 smb_fname->base_name));
741 }
742
743 TALLOC_FREE(pai_buf);
744 return paiv;
745 }
746
747 /****************************************************************************
748 Functions to manipulate the internal ACE format.
749 ****************************************************************************/
750
751 /****************************************************************************
752 Count a linked list of canonical ACE entries.
753 ****************************************************************************/
754
755 static size_t count_canon_ace_list( canon_ace *l_head )
756 {
757 size_t count = 0;
758 canon_ace *ace;
759
760 for (ace = l_head; ace; ace = ace->next)
761 count++;
762
763 return count;
764 }
765
766 /****************************************************************************
767 Free a linked list of canonical ACE entries.
768 ****************************************************************************/
769
770 static void free_canon_ace_list( canon_ace *l_head )
771 {
772 canon_ace *list, *next;
773
774 for (list = l_head; list; list = next) {
775 next = list->next;
776 DLIST_REMOVE(l_head, list);
777 TALLOC_FREE(list);
778 }
779 }
780
781 /****************************************************************************
782 Function to duplicate a canon_ace entry.
783 ****************************************************************************/
784
785 static canon_ace *dup_canon_ace( canon_ace *src_ace)
786 {
787 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
788
789 if (dst_ace == NULL)
790 return NULL;
791
792 *dst_ace = *src_ace;
793 dst_ace->prev = dst_ace->next = NULL;
794 return dst_ace;
795 }
796
797 /****************************************************************************
798 Print out a canon ace.
799 ****************************************************************************/
800
801 static void print_canon_ace(canon_ace *pace, int num)
802 {
803 struct dom_sid_buf buf;
804 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
805 dbgtext( "SID = %s ", dom_sid_str_buf(&pace->trustee, &buf));
806 if (pace->owner_type == UID_ACE) {
807 dbgtext( "uid %u ", (unsigned int)pace->unix_ug.id);
808 } else if (pace->owner_type == GID_ACE) {
809 dbgtext( "gid %u ", (unsigned int)pace->unix_ug.id);
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 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 int map_acl_perms_to_permset(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 static void create_file_sids(const SMB_STRUCT_STAT *psbuf,
917 struct dom_sid *powner_sid,
918 struct dom_sid *pgroup_sid)
919 {
920 uid_to_sid( powner_sid, psbuf->st_ex_uid );
921 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
922 }
923
924 /****************************************************************************
925 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
926 delete the second one. If the first is deny, mask the permissions off and delete the allow
927 if the permissions become zero, delete the deny if the permissions are non zero.
928 ****************************************************************************/
929
930 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
931 {
932 canon_ace *l_head = *pp_list_head;
933 canon_ace *curr_ace_outer;
934 canon_ace *curr_ace_outer_next;
935
936 /*
937 * First, merge allow entries with identical SIDs, and deny entries
938 * with identical SIDs.
939 */
940
941 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
942 canon_ace *curr_ace;
943 canon_ace *curr_ace_next;
944
945 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
946
947 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
948 bool can_merge = false;
949
950 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
951
952 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
953 * types are the same. For directory acls we must also
954 * ensure the POSIX ACL types are the same.
955 *
956 * For the IDMAP_BOTH case, we must not merge
957 * the UID and GID ACE values for same SID
958 */
959
960 if (!dir_acl) {
961 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
962 curr_ace->owner_type == curr_ace_outer->owner_type &&
963 (curr_ace->attr == curr_ace_outer->attr));
964 } else {
965 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
966 curr_ace->owner_type == curr_ace_outer->owner_type &&
967 (curr_ace->type == curr_ace_outer->type) &&
968 (curr_ace->attr == curr_ace_outer->attr));
969 }
970
971 if (can_merge) {
972 if( DEBUGLVL( 10 )) {
973 dbgtext("merge_aces: Merging ACE's\n");
974 print_canon_ace( curr_ace_outer, 0);
975 print_canon_ace( curr_ace, 0);
976 }
977
978 /* Merge two allow or two deny ACE's. */
979
980 /* Theoretically we shouldn't merge a dir ACE if
981 * one ACE has the CI flag set, and the other
982 * ACE has the OI flag set, but this is rare
983 * enough we can ignore it. */
984
985 curr_ace_outer->perms |= curr_ace->perms;
986 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
987 DLIST_REMOVE(l_head, curr_ace);
988 TALLOC_FREE(curr_ace);
989 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
990 }
991 }
992 }
993
994 /*
995 * Now go through and mask off allow permissions with deny permissions.
996 * We can delete either the allow or deny here as we know that each SID
997 * appears only once in the list.
998 */
999
1000 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
1001 canon_ace *curr_ace;
1002 canon_ace *curr_ace_next;
1003
1004 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1005
1006 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1007
1008 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1009
1010 /*
1011 * Subtract ACE's with different entries. Due to the ordering constraints
1012 * we've put on the ACL, we know the deny must be the first one.
1013 */
1014
1015 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1016 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1017 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1018
1019 if( DEBUGLVL( 10 )) {
1020 dbgtext("merge_aces: Masking ACE's\n");
1021 print_canon_ace( curr_ace_outer, 0);
1022 print_canon_ace( curr_ace, 0);
1023 }
1024
1025 curr_ace->perms &= ~curr_ace_outer->perms;
1026
1027 if (curr_ace->perms == 0) {
1028
1029 /*
1030 * The deny overrides the allow. Remove the allow.
1031 */
1032
1033 DLIST_REMOVE(l_head, curr_ace);
1034 TALLOC_FREE(curr_ace);
1035 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1036
1037 } else {
1038
1039 /*
1040 * Even after removing permissions, there
1041 * are still allow permissions - delete the deny.
1042 * It is safe to delete the deny here,
1043 * as we are guarenteed by the deny first
1044 * ordering that all the deny entries for
1045 * this SID have already been merged into one
1046 * before we can get to an allow ace.
1047 */
1048
1049 DLIST_REMOVE(l_head, curr_ace_outer);
1050 TALLOC_FREE(curr_ace_outer);
1051 break;
1052 }
1053 }
1054
1055 } /* end for curr_ace */
1056 } /* end for curr_ace_outer */
1057
1058 /* We may have modified the list. */
1059
1060 *pp_list_head = l_head;
1061 }
1062
1063 /****************************************************************************
1064 Map canon_ace perms to permission bits NT.
1065 The attr element is not used here - we only process deny entries on set,
1066 not get. Deny entries are implicit on get with ace->perms = 0.
1067 ****************************************************************************/
1068
1069 uint32_t map_canon_ace_perms(int snum,
1070 enum security_ace_type *pacl_type,
1071 mode_t perms,
1072 bool directory_ace)
1073 {
1074 uint32_t nt_mask = 0;
1075
1076 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1077
1078 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1079 if (directory_ace) {
1080 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1081 } else {
1082 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1083 }
1084 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1085 /*
1086 * Windows NT refuses to display ACEs with no permissions in them (but
1087 * they are perfectly legal with Windows 2000). If the ACE has empty
1088 * permissions we cannot use 0, so we use the otherwise unused
1089 * WRITE_OWNER permission, which we ignore when we set an ACL.
1090 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1091 * to be changed in the future.
1092 */
1093
1094 nt_mask = 0;
1095 } else {
1096 if (directory_ace) {
1097 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1098 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1099 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1100 } else {
1101 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1102 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1103 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1104 }
1105 }
1106
1107 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1108 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1109 }
1110
1111 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1112 (unsigned int)perms, (unsigned int)nt_mask ));
1113
1114 return nt_mask;
1115 }
1116
1117 /****************************************************************************
1118 Map NT perms to a UNIX mode_t.
1119 ****************************************************************************/
1120
1121 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1122 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1123 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1124
1125 static mode_t map_nt_perms( uint32_t *mask, int type)
1126 {
1127 mode_t mode = 0;
1128
1129 switch(type) {
1130 case S_IRUSR:
1131 if((*mask) & GENERIC_ALL_ACCESS)
1132 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1133 else {
1134 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1135 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1136 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1137 }
1138 break;
1139 case S_IRGRP:
1140 if((*mask) & GENERIC_ALL_ACCESS)
1141 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1142 else {
1143 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1144 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1145 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1146 }
1147 break;
1148 case S_IROTH:
1149 if((*mask) & GENERIC_ALL_ACCESS)
1150 mode = S_IROTH|S_IWOTH|S_IXOTH;
1151 else {
1152 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1153 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1154 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1155 }
1156 break;
1157 }
1158
1159 return mode;
1160 }
1161
1162 /****************************************************************************
1163 Unpack a struct security_descriptor into a UNIX owner and group.
1164 ****************************************************************************/
1165
1166 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1167 uid_t *puser, gid_t *pgrp,
1168 uint32_t security_info_sent, const struct
1169 security_descriptor *psd)
1170 {
1171 *puser = (uid_t)-1;
1172 *pgrp = (gid_t)-1;
1173
1174 if(security_info_sent == 0) {
1175 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1176 return NT_STATUS_OK;
1177 }
1178
1179 /*
1180 * Validate the owner and group SID's.
1181 */
1182
1183 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1184
1185 /*
1186 * Don't immediately fail if the owner sid cannot be validated.
1187 * This may be a group chown only set.
1188 */
1189
1190 if (security_info_sent & SECINFO_OWNER) {
1191 if (!sid_to_uid(psd->owner_sid, puser)) {
1192 if (lp_force_unknown_acl_user(SNUM(conn))) {
1193 /* this allows take ownership to work
1194 * reasonably */
1195 *puser = get_current_uid(conn);
1196 } else {
1197 struct dom_sid_buf buf;
1198 DBG_NOTICE("unable to validate"
1199 " owner sid for %s\n",
1200 dom_sid_str_buf(psd->owner_sid,
1201 &buf));
1202 return NT_STATUS_INVALID_OWNER;
1203 }
1204 }
1205 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1206 (unsigned int)*puser ));
1207 }
1208
1209 /*
1210 * Don't immediately fail if the group sid cannot be validated.
1211 * This may be an owner chown only set.
1212 */
1213
1214 if (security_info_sent & SECINFO_GROUP) {
1215 if (!sid_to_gid(psd->group_sid, pgrp)) {
1216 if (lp_force_unknown_acl_user(SNUM(conn))) {
1217 /* this allows take group ownership to work
1218 * reasonably */
1219 *pgrp = get_current_gid(conn);
1220 } else {
1221 DEBUG(3,("unpack_nt_owners: unable to validate"
1222 " group sid.\n"));
1223 return NT_STATUS_INVALID_OWNER;
1224 }
1225 }
1226 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1227 (unsigned int)*pgrp));
1228 }
1229
1230 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1231
1232 return NT_STATUS_OK;
1233 }
1234
1235
1236 static void trim_ace_perms(canon_ace *pace)
1237 {
1238 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1239 }
1240
1241 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1242 canon_ace *pace)
1243 {
1244 pace->perms |= S_IRUSR;
1245 if (is_directory) {
1246 pace->perms |= (S_IWUSR|S_IXUSR);
1247 }
1248 }
1249
1250 /****************************************************************************
1251 Check if a given uid/SID is in a group gid/SID. This is probably very
1252 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1253 ****************************************************************************/
1254
1255 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1256 {
1257 bool is_sid = false;
1258 bool has_sid = false;
1259 struct security_token *security_token = NULL;
1260
1261 /* "Everyone" always matches every uid. */
1262
1263 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1264 return True;
1265
1266 security_token = conn->session_info->security_token;
1267 /* security_token should not be NULL */
1268 SMB_ASSERT(security_token);
1269 is_sid = security_token_is_sid(security_token,
1270 &uid_ace->trustee);
1271 if (is_sid) {
1272 has_sid = security_token_has_sid(security_token,
1273 &group_ace->trustee);
1274
1275 if (has_sid) {
1276 return true;
1277 }
1278 }
1279
1280 /*
1281 * if it's the current user, we already have the unix token
1282 * and don't need to do the complex user_in_group_sid() call
1283 */
1284 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1285 const struct security_unix_token *curr_utok = NULL;
1286 size_t i;
1287
1288 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1289 return True;
1290 }
1291
1292 curr_utok = get_current_utok(conn);
1293 for (i=0; i < curr_utok->ngroups; i++) {
1294 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1295 return True;
1296 }
1297 }
1298 }
1299
1300 /*
1301 * user_in_group_sid() uses create_token_from_sid()
1302 * which creates an artificial NT token given just a username,
1303 * so this is not reliable for users from foreign domains
1304 * exported by winbindd!
1305 */
1306 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1307 }
1308
1309 /****************************************************************************
1310 A well formed POSIX file or default ACL has at least 3 entries, a
1311 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1312 In addition, the owner must always have at least read access.
1313 When using this call on get_acl, the pst struct is valid and contains
1314 the mode of the file.
1315 ****************************************************************************/
1316
1317 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1318 canon_ace **pp_ace,
1319 const struct dom_sid *pfile_owner_sid,
1320 const struct dom_sid *pfile_grp_sid,
1321 const SMB_STRUCT_STAT *pst)
1322 {
1323 canon_ace *pace;
1324 bool got_user = false;
1325 bool got_group = false;
1326 bool got_other = false;
1327
1328 for (pace = *pp_ace; pace; pace = pace->next) {
1329 if (pace->type == SMB_ACL_USER_OBJ) {
1330 got_user = true;
1331 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1332 got_group = true;
1333 } else if (pace->type == SMB_ACL_OTHER) {
1334 got_other = true;
1335 }
1336 }
1337
1338 if (!got_user) {
1339 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1340 DEBUG(0,("malloc fail.\n"));
1341 return false;
1342 }
1343
1344 ZERO_STRUCTP(pace);
1345 pace->type = SMB_ACL_USER_OBJ;
1346 pace->owner_type = UID_ACE;
1347 pace->unix_ug.type = ID_TYPE_UID;
1348 pace->unix_ug.id = pst->st_ex_uid;
1349 pace->trustee = *pfile_owner_sid;
1350 pace->attr = ALLOW_ACE;
1351 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1352 DLIST_ADD(*pp_ace, pace);
1353 }
1354
1355 if (!got_group) {
1356 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1357 DEBUG(0,("malloc fail.\n"));
1358 return false;
1359 }
1360
1361 ZERO_STRUCTP(pace);
1362 pace->type = SMB_ACL_GROUP_OBJ;
1363 pace->owner_type = GID_ACE;
1364 pace->unix_ug.type = ID_TYPE_GID;
1365 pace->unix_ug.id = pst->st_ex_gid;
1366 pace->trustee = *pfile_grp_sid;
1367 pace->attr = ALLOW_ACE;
1368 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1369 DLIST_ADD(*pp_ace, pace);
1370 }
1371
1372 if (!got_other) {
1373 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1374 DEBUG(0,("malloc fail.\n"));
1375 return false;
1376 }
1377
1378 ZERO_STRUCTP(pace);
1379 pace->type = SMB_ACL_OTHER;
1380 pace->owner_type = WORLD_ACE;
1381 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1382 pace->unix_ug.id = -1;
1383 pace->trustee = global_sid_World;
1384 pace->attr = ALLOW_ACE;
1385 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1386 DLIST_ADD(*pp_ace, pace);
1387 }
1388
1389 return true;
1390 }
1391
1392 /****************************************************************************
1393 A well formed POSIX file or default ACL has at least 3 entries, a
1394 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1395 In addition, the owner must always have at least read access.
1396 When using this call on set_acl, the pst struct has
1397 been modified to have a mode containing the default for this file or directory
1398 type.
1399 ****************************************************************************/
1400
1401 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1402 canon_ace **pp_ace,
1403 bool is_default_acl,
1404 const struct share_params *params,
1405 const bool is_directory,
1406 const struct dom_sid *pfile_owner_sid,
1407 const struct dom_sid *pfile_grp_sid,
1408 const SMB_STRUCT_STAT *pst)
1409 {
1410 canon_ace *pace;
1411 canon_ace *pace_user = NULL;
1412 canon_ace *pace_group = NULL;
1413 canon_ace *pace_other = NULL;
1414 bool got_duplicate_user = false;
1415 bool got_duplicate_group = false;
1416
1417 for (pace = *pp_ace; pace; pace = pace->next) {
1418 trim_ace_perms(pace);
1419 if (pace->type == SMB_ACL_USER_OBJ) {
1420 ensure_minimal_owner_ace_perms(is_directory, pace);
1421 pace_user = pace;
1422 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1423 pace_group = pace;
1424 } else if (pace->type == SMB_ACL_OTHER) {
1425 pace_other = pace;
1426 }
1427 }
1428
1429 if (!pace_user) {
1430 canon_ace *pace_iter;
1431
1432 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1433 DEBUG(0,("talloc fail.\n"));
1434 return false;
1435 }
1436
1437 ZERO_STRUCTP(pace);
1438 pace->type = SMB_ACL_USER_OBJ;
1439 pace->owner_type = UID_ACE;
1440 pace->unix_ug.type = ID_TYPE_UID;
1441 pace->unix_ug.id = pst->st_ex_uid;
1442 pace->trustee = *pfile_owner_sid;
1443 pace->attr = ALLOW_ACE;
1444 /* Start with existing user permissions, principle of least
1445 surprises for the user. */
1446 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1447
1448 /* See if the owning user is in any of the other groups in
1449 the ACE, or if there's a matching user entry (by uid
1450 or in the case of ID_TYPE_BOTH by SID).
1451 If so, OR in the permissions from that entry. */
1452
1453
1454 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1455 if (pace_iter->type == SMB_ACL_USER &&
1456 pace_iter->unix_ug.id == pace->unix_ug.id) {
1457 pace->perms |= pace_iter->perms;
1458 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1459 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1460 pace->perms |= pace_iter->perms;
1461 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1462 pace->perms |= pace_iter->perms;
1463 }
1464 }
1465 }
1466
1467 if (pace->perms == 0) {
1468 /* If we only got an "everyone" perm, just use that. */
1469 if (pace_other)
1470 pace->perms = pace_other->perms;
1471 }
1472
1473 /*
1474 * Ensure we have default parameters for the
1475 * user (owner) even on default ACLs.
1476 */
1477 ensure_minimal_owner_ace_perms(is_directory, pace);
1478
1479 DLIST_ADD(*pp_ace, pace);
1480 pace_user = pace;
1481 }
1482
1483 if (!pace_group) {
1484 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1485 DEBUG(0,("talloc fail.\n"));
1486 return false;
1487 }
1488
1489 ZERO_STRUCTP(pace);
1490 pace->type = SMB_ACL_GROUP_OBJ;
1491 pace->owner_type = GID_ACE;
1492 pace->unix_ug.type = ID_TYPE_GID;
1493 pace->unix_ug.id = pst->st_ex_gid;
1494 pace->trustee = *pfile_grp_sid;
1495 pace->attr = ALLOW_ACE;
1496
1497 /* If we only got an "everyone" perm, just use that. */
1498 if (pace_other) {
1499 pace->perms = pace_other->perms;
1500 } else {
1501 pace->perms = 0;
1502 }
1503
1504 DLIST_ADD(*pp_ace, pace);
1505 pace_group = pace;
1506 }
1507
1508 if (!pace_other) {
1509 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1510 DEBUG(0,("talloc fail.\n"));
1511 return false;
1512 }
1513
1514 ZERO_STRUCTP(pace);
1515 pace->type = SMB_ACL_OTHER;
1516 pace->owner_type = WORLD_ACE;
1517 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1518 pace->unix_ug.id = -1;
1519 pace->trustee = global_sid_World;
1520 pace->attr = ALLOW_ACE;
1521 pace->perms = 0;
1522
1523 DLIST_ADD(*pp_ace, pace);
1524 pace_other = pace;
1525 }
1526
1527 /* Ensure when setting a POSIX ACL, that the uid for a
1528 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1529 permission entry as an SMB_ACL_USER, and a gid for a
1530 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1531 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1532 then if the ownership or group ownership of this file or
1533 directory gets changed, the user or group can lose their
1534 access. */
1535
1536 for (pace = *pp_ace; pace; pace = pace->next) {
1537 if (pace->type == SMB_ACL_USER &&
1538 pace->unix_ug.id == pace_user->unix_ug.id) {
1539 /* Already got one. */
1540 got_duplicate_user = true;
1541 } else if (pace->type == SMB_ACL_GROUP &&
1542 pace->unix_ug.id == pace_group->unix_ug.id) {
1543 /* Already got one. */
1544 got_duplicate_group = true;
1545 } else if ((pace->type == SMB_ACL_GROUP)
1546 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1547 /* If the SID owning the file appears
1548 * in a group entry, then we have
1549 * enough duplication, they will still
1550 * have access */
1551 got_duplicate_user = true;
1552 }
1553 }
1554
1555 /* If the SID is equal for the user and group that we need
1556 to add the duplicate for, add only the group */
1557 if (!got_duplicate_user && !got_duplicate_group
1558 && dom_sid_equal(&pace_group->trustee,
1559 &pace_user->trustee)) {
1560 /* Add a duplicate SMB_ACL_GROUP entry, this
1561 * will cover the owning SID as well, as it
1562 * will always be mapped to both a uid and
1563 * gid. */
1564
1565 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1566 DEBUG(0,("talloc fail.\n"));
1567 return false;
1568 }
1569
1570 ZERO_STRUCTP(pace);
1571 pace->type = SMB_ACL_GROUP;;
1572 pace->owner_type = GID_ACE;
1573 pace->unix_ug.type = ID_TYPE_GID;
1574 pace->unix_ug.id = pace_group->unix_ug.id;
1575 pace->trustee = pace_group->trustee;
1576 pace->attr = pace_group->attr;
1577 pace->perms = pace_group->perms;
1578
1579 DLIST_ADD(*pp_ace, pace);
1580
1581 /* We're done here, make sure the
1582 statements below are not executed. */
1583 got_duplicate_user = true;
1584 got_duplicate_group = true;
1585 }
1586
1587 if (!got_duplicate_user) {
1588 /* Add a duplicate SMB_ACL_USER entry. */
1589 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1590 DEBUG(0,("talloc fail.\n"));
1591 return false;
1592 }
1593
1594 ZERO_STRUCTP(pace);
1595 pace->type = SMB_ACL_USER;;
1596 pace->owner_type = UID_ACE;
1597 pace->unix_ug.type = ID_TYPE_UID;
1598 pace->unix_ug.id = pace_user->unix_ug.id;
1599 pace->trustee = pace_user->trustee;
1600 pace->attr = pace_user->attr;
1601 pace->perms = pace_user->perms;
1602
1603 DLIST_ADD(*pp_ace, pace);
1604
1605 got_duplicate_user = true;
1606 }
1607
1608 if (!got_duplicate_group) {
1609 /* Add a duplicate SMB_ACL_GROUP entry. */
1610 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1611 DEBUG(0,("talloc fail.\n"));
1612 return false;
1613 }
1614
1615 ZERO_STRUCTP(pace);
1616 pace->type = SMB_ACL_GROUP;;
1617 pace->owner_type = GID_ACE;
1618 pace->unix_ug.type = ID_TYPE_GID;
1619 pace->unix_ug.id = pace_group->unix_ug.id;
1620 pace->trustee = pace_group->trustee;
1621 pace->attr = pace_group->attr;
1622 pace->perms = pace_group->perms;
1623
1624 DLIST_ADD(*pp_ace, pace);
1625
1626 got_duplicate_group = true;
1627 }
1628
1629 return true;
1630 }
1631
1632 /****************************************************************************
1633 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1634 If it does not have them, check if there are any entries where the trustee is the
1635 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1636 Note we must not do this to default directory ACLs.
1637 ****************************************************************************/
1638
1639 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1640 {
1641 bool got_user_obj, got_group_obj;
1642 canon_ace *current_ace;
1643 int i, entries;
1644
1645 entries = count_canon_ace_list(ace);
1646 got_user_obj = False;
1647 got_group_obj = False;
1648
1649 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1650 if (current_ace->type == SMB_ACL_USER_OBJ)
1651 got_user_obj = True;
1652 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1653 got_group_obj = True;
1654 }
1655 if (got_user_obj && got_group_obj) {
1656 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1657 return;
1658 }
1659
1660 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1661 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1662 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1663 current_ace->type = SMB_ACL_USER_OBJ;
1664 got_user_obj = True;
1665 }
1666 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1667 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1668 current_ace->type = SMB_ACL_GROUP_OBJ;
1669 got_group_obj = True;
1670 }
1671 }
1672 if (!got_user_obj)
1673 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1674 if (!got_group_obj)
1675 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1676 }
1677
1678 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1679 canon_ace **file_ace, canon_ace **dir_ace,
1680 bool *got_file_allow, bool *got_dir_allow,
1681 bool *all_aces_are_inherit_only,
1682 canon_ace *current_ace)
1683 {
1684
1685 /*
1686 * Map the given NT permissions into a UNIX mode_t containing only
1687 * S_I(R|W|X)USR bits.
1688 */
1689
1690 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1691 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1692
1693 /* Store the ace_flag. */
1694 current_ace->ace_flags = psa->flags;
1695
1696 /*
1697 * Now add the created ace to either the file list, the directory
1698 * list, or both. We *MUST* preserve the order here (hence we use
1699 * DLIST_ADD_END) as NT ACLs are order dependent.
1700 */
1701
1702 if (fsp->fsp_flags.is_directory) {
1703
1704 /*
1705 * We can only add to the default POSIX ACE list if the ACE is
1706 * designed to be inherited by both files and directories.
1707 */
1708
1709 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1710 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1711
1712 canon_ace *current_dir_ace = current_ace;
1713 DLIST_ADD_END(*dir_ace, current_ace);
1714
1715 /*
1716 * Note if this was an allow ace. We can't process
1717 * any further deny ace's after this.
1718 */
1719
1720 if (current_ace->attr == ALLOW_ACE)
1721 *got_dir_allow = True;
1722
1723 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1724 DEBUG(0,("add_current_ace_to_acl: "
1725 "malformed ACL in "
1726 "inheritable ACL! Deny entry "
1727 "after Allow entry. Failing "
1728 "to set on file %s.\n",
1729 fsp_str_dbg(fsp)));
1730 return False;
1731 }
1732
1733 if( DEBUGLVL( 10 )) {
1734 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1735 print_canon_ace( current_ace, 0);
1736 }
1737
1738 /*
1739 * If this is not an inherit only ACE we need to add a duplicate
1740 * to the file acl.
1741 */
1742
1743 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1744 canon_ace *dup_ace = dup_canon_ace(current_ace);
1745
1746 if (!dup_ace) {
1747 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1748 return False;
1749 }
1750
1751 /*
1752 * We must not free current_ace here as its
1753 * pointer is now owned by the dir_ace list.
1754 */
1755 current_ace = dup_ace;
1756 /* We've essentially split this ace into two,
1757 * and added the ace with inheritance request
1758 * bits to the directory ACL. Drop those bits for
1759 * the ACE we're adding to the file list. */
1760 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1761 SEC_ACE_FLAG_CONTAINER_INHERIT|
1762 SEC_ACE_FLAG_INHERIT_ONLY);
1763 } else {
1764 /*
1765 * We must not free current_ace here as its
1766 * pointer is now owned by the dir_ace list.
1767 */
1768 current_ace = NULL;
1769 }
1770
1771 /*
1772 * current_ace is now either owned by file_ace
1773 * or is NULL. We can safely operate on current_dir_ace
1774 * to treat mapping for default acl entries differently
1775 * than access acl entries.
1776 */
1777
1778 if (current_dir_ace->owner_type == UID_ACE) {
1779 /*
1780 * We already decided above this is a uid,
1781 * for default acls ace's only CREATOR_OWNER
1782 * maps to ACL_USER_OBJ. All other uid
1783 * ace's are ACL_USER.
1784 */
1785 if (dom_sid_equal(&current_dir_ace->trustee,
1786 &global_sid_Creator_Owner)) {
1787 current_dir_ace->type = SMB_ACL_USER_OBJ;
1788 } else {
1789 current_dir_ace->type = SMB_ACL_USER;
1790 }
1791 }
1792
1793 if (current_dir_ace->owner_type == GID_ACE) {
1794 /*
1795 * We already decided above this is a gid,
1796 * for default acls ace's only CREATOR_GROUP
1797 * maps to ACL_GROUP_OBJ. All other uid
1798 * ace's are ACL_GROUP.
1799 */
1800 if (dom_sid_equal(&current_dir_ace->trustee,
1801 &global_sid_Creator_Group)) {
1802 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1803 } else {
1804 current_dir_ace->type = SMB_ACL_GROUP;
1805 }
1806 }
1807 }
1808 }
1809
1810 /*
1811 * Only add to the file ACL if not inherit only.
1812 */
1813
1814 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1815 DLIST_ADD_END(*file_ace, current_ace);
1816
1817 /*
1818 * Note if this was an allow ace. We can't process
1819 * any further deny ace's after this.
1820 */
1821
1822 if (current_ace->attr == ALLOW_ACE)
1823 *got_file_allow = True;
1824
1825 if ((current_ace->attr == DENY_ACE) && *got_file_allow) {
1826 DEBUG(0,("add_current_ace_to_acl: malformed "
1827 "ACL in file ACL ! Deny entry after "
1828 "Allow entry. Failing to set on file "
1829 "%s.\n", fsp_str_dbg(fsp)));
1830 return False;
1831 }
1832
1833 if( DEBUGLVL( 10 )) {
1834 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1835 print_canon_ace( current_ace, 0);
1836 }
1837 *all_aces_are_inherit_only = False;
1838 /*
1839 * We must not free current_ace here as its
1840 * pointer is now owned by the file_ace list.
1841 */
1842 current_ace = NULL;
1843 }
1844
1845 /*
1846 * Free if ACE was not added.
1847 */
1848
1849 TALLOC_FREE(current_ace);
1850 return true;
1851 }
1852
1853 /****************************************************************************
1854 Unpack a struct security_descriptor into two canonical ace lists.
1855 ****************************************************************************/
1856
1857 static bool create_canon_ace_lists(files_struct *fsp,
1858 const SMB_STRUCT_STAT *pst,
1859 struct dom_sid *pfile_owner_sid,
1860 struct dom_sid *pfile_grp_sid,
1861 canon_ace **ppfile_ace,
1862 canon_ace **ppdir_ace,
1863 const struct security_acl *dacl)
1864 {
1865 bool all_aces_are_inherit_only = (fsp->fsp_flags.is_directory);
1866 canon_ace *file_ace = NULL;
1867 canon_ace *dir_ace = NULL;
1868 canon_ace *current_ace = NULL;
1869 bool got_dir_allow = False;
1870 bool got_file_allow = False;
1871 uint32_t i, j;
1872
1873 *ppfile_ace = NULL;
1874 *ppdir_ace = NULL;
1875
1876 /*
1877 * Convert the incoming ACL into a more regular form.
1878 */
1879
1880 for(i = 0; i < dacl->num_aces; i++) {
1881 struct security_ace *psa = &dacl->aces[i];
1882
1883 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1884 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1885 return False;
1886 }
1887 }
1888
1889 /*
1890 * Deal with the fact that NT 4.x re-writes the canonical format
1891 * that we return for default ACLs. If a directory ACE is identical
1892 * to a inherited directory ACE then NT changes the bits so that the
1893 * first ACE is set to OI|IO and the second ACE for this SID is set
1894 * to CI. We need to repair this. JRA.
1895 */
1896
1897 for(i = 0; i < dacl->num_aces; i++) {
1898 struct security_ace *psa1 = &dacl->aces[i];
1899
1900 for (j = i + 1; j < dacl->num_aces; j++) {
1901 struct security_ace *psa2 = &dacl->aces[j];
1902
1903 if (psa1->access_mask != psa2->access_mask)
1904 continue;
1905
1906 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1907 continue;
1908
1909 /*
1910 * Ok - permission bits and SIDs are equal.
1911 * Check if flags were re-written.
1912 */
1913
1914 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1915
1916 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1917 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1918
1919 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1920
1921 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1922 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1923
1924 }
1925 }
1926 }
1927
1928 for(i = 0; i < dacl->num_aces; i++) {
1929 struct security_ace *psa = &dacl->aces[i];
1930
1931 /*
1932 * Create a canon_ace entry representing this NT DACL ACE.
1933 */
1934
1935 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1936 free_canon_ace_list(file_ace);
1937 free_canon_ace_list(dir_ace);
1938 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1939 return False;
1940 }
1941
1942 ZERO_STRUCTP(current_ace);
1943
1944 sid_copy(&current_ace->trustee, &psa->trustee);
1945
1946 /*
1947 * Try and work out if the SID is a user or group
1948 * as we need to flag these differently for POSIX.
1949 * Note what kind of a POSIX ACL this should map to.
1950 */
1951
1952 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1953 current_ace->owner_type = WORLD_ACE;
1954 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1955 current_ace->unix_ug.id = -1;
1956 current_ace->type = SMB_ACL_OTHER;
1957 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1958 current_ace->owner_type = UID_ACE;
1959 current_ace->unix_ug.type = ID_TYPE_UID;
1960 current_ace->unix_ug.id = pst->st_ex_uid;
1961 current_ace->type = SMB_ACL_USER_OBJ;
1962
1963 /*
1964 * The Creator Owner entry only specifies inheritable permissions,
1965 * never access permissions. WinNT doesn't always set the ACE to
1966 * INHERIT_ONLY, though.
1967 */
1968
1969 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1970
1971 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1972 current_ace->owner_type = GID_ACE;
1973 current_ace->unix_ug.type = ID_TYPE_GID;
1974 current_ace->unix_ug.id = pst->st_ex_gid;
1975 current_ace->type = SMB_ACL_GROUP_OBJ;
1976
1977 /*
1978 * The Creator Group entry only specifies inheritable permissions,
1979 * never access permissions. WinNT doesn't always set the ACE to
1980 * INHERIT_ONLY, though.
1981 */
1982 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1983
1984 } else {
1985 struct unixid unixid;
1986
1987 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1988 struct dom_sid_buf buf;
1989 free_canon_ace_list(file_ace);
1990 free_canon_ace_list(dir_ace);
1991 TALLOC_FREE(current_ace);
1992 DBG_ERR("sids_to_unixids failed for %s "
1993 "(allocation failure)\n",
1994 dom_sid_str_buf(&current_ace->trustee,
1995 &buf));
1996 return false;
1997 }
1998
1999 if (unixid.type == ID_TYPE_BOTH) {
2000 /*
2001 * We must add both a user and group
2002 * entry POSIX_ACL.
2003 * This is due to the fact that in POSIX
2004 * user entries are more specific than
2005 * groups.
2006 */
2007 current_ace->owner_type = UID_ACE;
2008 current_ace->unix_ug.type = ID_TYPE_UID;
2009 current_ace->unix_ug.id = unixid.id;
2010 current_ace->type =
2011 (unixid.id == pst->st_ex_uid) ?
2012 SMB_ACL_USER_OBJ :
2013 SMB_ACL_USER;
2014
2015 /* Add the user object to the posix ACL,
2016 and proceed to the group mapping
2017 below. This handles the talloc_free
2018 of current_ace if not added for some
2019 reason */
2020 if (!add_current_ace_to_acl(fsp,
2021 psa,
2022 &file_ace,
2023 &dir_ace,
2024 &got_file_allow,
2025 &got_dir_allow,
2026 &all_aces_are_inherit_only,
2027 current_ace)) {
2028 free_canon_ace_list(file_ace);
2029 free_canon_ace_list(dir_ace);
2030 return false;
2031 }
2032
2033 if ((current_ace = talloc(talloc_tos(),
2034 canon_ace)) == NULL) {
2035 free_canon_ace_list(file_ace);
2036 free_canon_ace_list(dir_ace);
2037 DEBUG(0,("create_canon_ace_lists: "
2038 "malloc fail.\n"));
2039 return False;
2040 }
2041
2042 ZERO_STRUCTP(current_ace);
2043
2044 sid_copy(&current_ace->trustee, &psa->trustee);
2045
2046 current_ace->unix_ug.type = ID_TYPE_GID;
2047 current_ace->unix_ug.id = unixid.id;
2048 current_ace->owner_type = GID_ACE;
2049 /* If it's the primary group, this is a
2050 group_obj, not a group. */
2051 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2052 current_ace->type = SMB_ACL_GROUP_OBJ;
2053 } else {
2054 current_ace->type = SMB_ACL_GROUP;
2055 }
2056
2057 } else if (unixid.type == ID_TYPE_UID) {
2058 current_ace->owner_type = UID_ACE;
2059 current_ace->unix_ug.type = ID_TYPE_UID;
2060 current_ace->unix_ug.id = unixid.id;
2061 /* If it's the owning user, this is a user_obj,
2062 not a user. */
2063 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2064 current_ace->type = SMB_ACL_USER_OBJ;
2065 } else {
2066 current_ace->type = SMB_ACL_USER;
2067 }
2068 } else if (unixid.type == ID_TYPE_GID) {
2069 current_ace->unix_ug.type = ID_TYPE_GID;
2070 current_ace->unix_ug.id = unixid.id;
2071 current_ace->owner_type = GID_ACE;
2072 /* If it's the primary group, this is a
2073 group_obj, not a group. */
2074 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2075 current_ace->type = SMB_ACL_GROUP_OBJ;
2076 } else {
2077 current_ace->type = SMB_ACL_GROUP;
2078 }
2079 } else {
2080 struct dom_sid_buf buf;
2081 /*
2082 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2083 */
2084
2085 if (non_mappable_sid(&psa->trustee)) {
2086 DBG_DEBUG("ignoring "
2087 "non-mappable SID %s\n",
2088 dom_sid_str_buf(
2089 &psa->trustee,
2090 &buf));
2091 TALLOC_FREE(current_ace);
2092 continue;
2093 }
2094
2095 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2096 DBG_DEBUG("ignoring unknown or "
2097 "foreign SID %s\n",
2098 dom_sid_str_buf(
2099 &psa->trustee,
2100 &buf));
2101 TALLOC_FREE(current_ace);
2102 continue;
2103 }
2104
2105 free_canon_ace_list(file_ace);
2106 free_canon_ace_list(dir_ace);
2107 DBG_ERR("unable to map SID %s to uid or "
2108 "gid.\n",
2109 dom_sid_str_buf(&current_ace->trustee,
2110 &buf));
2111 TALLOC_FREE(current_ace);
2112 return false;
2113 }
2114 }
2115
2116 /* handles the talloc_free of current_ace if not added for some reason */
2117 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2118 &got_file_allow, &got_dir_allow,
2119 &all_aces_are_inherit_only, current_ace)) {
2120 free_canon_ace_list(file_ace);
2121 free_canon_ace_list(dir_ace);
2122 return false;
2123 }
2124 }
2125
2126 if (fsp->fsp_flags.is_directory && all_aces_are_inherit_only) {
2127 /*
2128 * Windows 2000 is doing one of these weird 'inherit acl'
2129 * traverses to conserve NTFS ACL resources. Just pretend
2130 * there was no DACL sent. JRA.
2131 */
2132
2133 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2134 free_canon_ace_list(file_ace);
2135 free_canon_ace_list(dir_ace);
2136 file_ace = NULL;
2137 dir_ace = NULL;
2138 } else {
2139 /*
2140 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2141 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2142 * entries can be converted to *_OBJ. Don't do this for the default
2143 * ACL, we will create them separately for this if needed inside
2144 * ensure_canon_entry_valid_on_set().
2145 */
2146 if (file_ace) {
2147 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2148 }
2149 }
2150
2151 *ppfile_ace = file_ace;
2152 *ppdir_ace = dir_ace;
2153
2154 return True;
2155 }
2156
2157 /****************************************************************************
2158 ASCII art time again... JRA :-).
2159
2160 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2161 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2162 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2163 allow or deny have been merged, so the same SID can only appear once in the deny
2164 list or once in the allow list.
2165
2166 We then process as follows :
2167
2168 ---------------------------------------------------------------------------
2169 First pass - look for a Everyone DENY entry.
2170
2171 If it is deny all (rwx) trunate the list at this point.
2172 Else, walk the list from this point and use the deny permissions of this
2173 entry as a mask on all following allow entries. Finally, delete
2174 the Everyone DENY entry (we have applied it to everything possible).
2175
2176 In addition, in this pass we remove any DENY entries that have
2177 no permissions (ie. they are a DENY nothing).
2178 ---------------------------------------------------------------------------
2179 Second pass - only deal with deny user entries.
2180
2181 DENY user1 (perms XXX)
2182
2183 new_perms = 0
2184 for all following allow group entries where user1 is in group
2185 new_perms |= group_perms;
2186
2187 user1 entry perms = new_perms & ~ XXX;
2188
2189 Convert the deny entry to an allow entry with the new perms and
2190 push to the end of the list. Note if the user was in no groups
2191 this maps to a specific allow nothing entry for this user.
2192
2193 The common case from the NT ACL choser (userX deny all) is
2194 optimised so we don't do the group lookup - we just map to
2195 an allow nothing entry.
2196
2197 What we're doing here is inferring the allow permissions the
2198 person setting the ACE on user1 wanted by looking at the allow
2199 permissions on the groups the user is currently in. This will
2200 be a snapshot, depending on group membership but is the best
2201 we can do and has the advantage of failing closed rather than
2202 open.
2203 ---------------------------------------------------------------------------
2204 Third pass - only deal with deny group entries.
2205
2206 DENY group1 (perms XXX)
2207
2208 for all following allow user entries where user is in group1
2209 user entry perms = user entry perms & ~ XXX;
2210
2211 If there is a group Everyone allow entry with permissions YYY,
2212 convert the group1 entry to an allow entry and modify its
2213 permissions to be :
2214
2215 new_perms = YYY & ~ XXX
2216
2217 and push to the end of the list.
2218
2219 If there is no group Everyone allow entry then convert the
2220 group1 entry to a allow nothing entry and push to the end of the list.
2221
2222 Note that the common case from the NT ACL choser (groupX deny all)
2223 cannot be optimised here as we need to modify user entries who are
2224 in the group to change them to a deny all also.
2225
2226 What we're doing here is modifying the allow permissions of
2227 user entries (which are more specific in POSIX ACLs) to mask
2228 out the explicit deny set on the group they are in. This will
2229 be a snapshot depending on current group membership but is the
2230 best we can do and has the advantage of failing closed rather
2231 than open.
2232 ---------------------------------------------------------------------------
2233 Fourth pass - cope with cumulative permissions.
2234
2235 for all allow user entries, if there exists an allow group entry with
2236 more permissive permissions, and the user is in that group, rewrite the
2237 allow user permissions to contain both sets of permissions.
2238
2239 Currently the code for this is #ifdef'ed out as these semantics make
2240 no sense to me. JRA.
2241 ---------------------------------------------------------------------------
2242
2243 Note we *MUST* do the deny user pass first as this will convert deny user
2244 entries into allow user entries which can then be processed by the deny
2245 group pass.
2246
2247 The above algorithm took a *lot* of thinking about - hence this
2248 explaination :-). JRA.
2249 ****************************************************************************/
2250
2251 /****************************************************************************
2252 Process a canon_ace list entries. This is very complex code. We need
2253 to go through and remove the "deny" permissions from any allow entry that matches
2254 the id of this entry. We have already refused any NT ACL that wasn't in correct
2255 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2256 we just remove it (to fail safe). We have already removed any duplicate ace
2257 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2258 allow entries.
2259 ****************************************************************************/
2260
2261 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2262 {
2263 canon_ace *ace_list = *pp_ace_list;
2264 canon_ace *curr_ace = NULL;
2265 canon_ace *curr_ace_next = NULL;
2266
2267 /* Pass 1 above - look for an Everyone, deny entry. */
2268
2269 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2270 canon_ace *allow_ace_p;
2271
2272 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2273
2274 if (curr_ace->attr != DENY_ACE)
2275 continue;
2276
2277 if (curr_ace->perms == (mode_t)0) {
2278
2279 /* Deny nothing entry - delete. */
2280
2281 DLIST_REMOVE(ace_list, curr_ace);
2282 continue;
2283 }
2284
2285 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2286 continue;
2287
2288 /* JRATEST - assert. */
2289 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2290
2291 if (curr_ace->perms == ALL_ACE_PERMS) {
2292
2293 /*
2294 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2295 * list at this point including this entry.
2296 */
2297
2298 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2299
2300 free_canon_ace_list( curr_ace );
2301 if (prev_entry)
2302 DLIST_REMOVE(ace_list, prev_entry);
2303 else {
2304 /* We deleted the entire list. */
2305 ace_list = NULL;
2306 }
2307 break;
2308 }
2309
2310 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2311
2312 /*
2313 * Only mask off allow entries.
2314 */
2315
2316 if (allow_ace_p->attr != ALLOW_ACE)
2317 continue;
2318
2319 allow_ace_p->perms &= ~curr_ace->perms;
2320 }
2321
2322 /*
2323 * Now it's been applied, remove it.
2324 */
2325
2326 DLIST_REMOVE(ace_list, curr_ace);
2327 }
2328
2329 /* Pass 2 above - deal with deny user entries. */
2330
2331 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2332 mode_t new_perms = (mode_t)0;
2333 canon_ace *allow_ace_p;
2334
2335 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2336
2337 if (curr_ace->attr != DENY_ACE)
2338 continue;
2339
2340 if (curr_ace->owner_type != UID_ACE)
2341 continue;
2342
2343 if (curr_ace->perms == ALL_ACE_PERMS) {
2344
2345 /*
2346 * Optimisation - this is a deny everything to this user.
2347 * Convert to an allow nothing and push to the end of the list.
2348 */
2349
2350 curr_ace->attr = ALLOW_ACE;
2351 curr_ace->perms = (mode_t)0;
2352 DLIST_DEMOTE(ace_list, curr_ace);
2353 continue;
2354 }
2355
2356 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2357
2358 if (allow_ace_p->attr != ALLOW_ACE)
2359 continue;
2360
2361 /* We process GID_ACE and WORLD_ACE entries only. */
2362
2363 if (allow_ace_p->owner_type == UID_ACE)
2364 continue;
2365
2366 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2367 new_perms |= allow_ace_p->perms;
2368 }
2369
2370 /*
2371 * Convert to a allow entry, modify the perms and push to the end
2372 * of the list.
2373 */
2374
2375 curr_ace->attr = ALLOW_ACE;
2376 curr_ace->perms = (new_perms & ~curr_ace->perms);
2377 DLIST_DEMOTE(ace_list, curr_ace);
2378 }
2379
2380 /* Pass 3 above - deal with deny group entries. */
2381
2382 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2383 canon_ace *allow_ace_p;
2384 canon_ace *allow_everyone_p = NULL;
2385
2386 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2387
2388 if (curr_ace->attr != DENY_ACE)
2389 continue;
2390
2391 if (curr_ace->owner_type != GID_ACE)
2392 continue;
2393
2394 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2395
2396 if (allow_ace_p->attr != ALLOW_ACE)
2397 continue;
2398
2399 /* Store a pointer to the Everyone allow, if it exists. */
2400 if (allow_ace_p->owner_type == WORLD_ACE)
2401 allow_everyone_p = allow_ace_p;
2402
2403 /* We process UID_ACE entries only. */
2404
2405 if (allow_ace_p->owner_type != UID_ACE)
2406 continue;
2407
2408 /* Mask off the deny group perms. */
2409
2410 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2411 allow_ace_p->perms &= ~curr_ace->perms;
2412 }
2413
2414 /*
2415 * Convert the deny to an allow with the correct perms and
2416 * push to the end of the list.
2417 */
2418
2419 curr_ace->attr = ALLOW_ACE;
2420 if (allow_everyone_p)
2421 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2422 else
2423 curr_ace->perms = (mode_t)0;
2424 DLIST_DEMOTE(ace_list, curr_ace);
2425 }
2426
2427 /* Doing this fourth pass allows Windows semantics to be layered
2428 * on top of POSIX semantics. I'm not sure if this is desirable.
2429 * For example, in W2K ACLs there is no way to say, "Group X no
2430 * access, user Y full access" if user Y is a member of group X.
2431 * This seems completely broken semantics to me.... JRA.
2432 */
2433
2434 #if 0
2435 /* Pass 4 above - deal with allow entries. */
2436
2437 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2438 canon_ace *allow_ace_p;
2439
2440 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2441
2442 if (curr_ace->attr != ALLOW_ACE)
2443 continue;
2444
2445 if (curr_ace->owner_type != UID_ACE)
2446 continue;
2447
2448 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2449
2450 if (allow_ace_p->attr != ALLOW_ACE)
2451 continue;
2452
2453 /* We process GID_ACE entries only. */
2454
2455 if (allow_ace_p->owner_type != GID_ACE)
2456 continue;
2457
2458 /* OR in the group perms. */
2459
2460 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2461 curr_ace->perms |= allow_ace_p->perms;
2462 }
2463 }
2464 #endif
2465
2466 *pp_ace_list = ace_list;
2467 }
2468
2469 /****************************************************************************
2470 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2471 succeeding.
2472 ****************************************************************************/
2473
2474 static bool unpack_canon_ace(files_struct *fsp,
2475 const SMB_STRUCT_STAT *pst,
2476 struct dom_sid *pfile_owner_sid,
2477 struct dom_sid *pfile_grp_sid,
2478 canon_ace **ppfile_ace,
2479 canon_ace **ppdir_ace,
2480 uint32_t security_info_sent,
2481 const struct security_descriptor *psd)
2482 {
2483 canon_ace *file_ace = NULL;
2484 canon_ace *dir_ace = NULL;
2485 bool ok;
2486
2487 *ppfile_ace = NULL;
2488 *ppdir_ace = NULL;
2489
2490 if(security_info_sent == 0) {
2491 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2492 return False;
2493 }
2494
2495 /*
2496 * If no DACL then this is a chown only security descriptor.
2497 */
2498
2499 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2500 return True;
2501
2502 /*
2503 * Now go through the DACL and create the canon_ace lists.
2504 */
2505
2506 if (!create_canon_ace_lists(fsp, pst, pfile_owner_sid, pfile_grp_sid,
2507 &file_ace, &dir_ace, psd->dacl)) {
2508 return False;
2509 }
2510
2511 if ((file_ace == NULL) && (dir_ace == NULL)) {
2512 /* W2K traverse DACL set - ignore. */
2513 return True;
2514 }
2515
2516 /*
2517 * Go through the canon_ace list and merge entries
2518 * belonging to identical users of identical allow or deny type.
2519 * We can do this as all deny entries come first, followed by
2520 * all allow entries (we have mandated this before accepting this acl).
2521 */
2522
2523 print_canon_ace_list( "file ace - before merge", file_ace);
2524 merge_aces( &file_ace, false);
2525
2526 print_canon_ace_list( "dir ace - before merge", dir_ace);
2527 merge_aces( &dir_ace, true);
2528
2529 /*
2530 * NT ACLs are order dependent. Go through the acl lists and
2531 * process DENY entries by masking the allow entries.
2532 */
2533
2534 print_canon_ace_list( "file ace - before deny", file_ace);
2535 process_deny_list(fsp->conn, &file_ace);
2536
2537 print_canon_ace_list( "dir ace - before deny", dir_ace);
2538 process_deny_list(fsp->conn, &dir_ace);
2539
2540 /*
2541 * A well formed POSIX file or default ACL has at least 3 entries, a
2542 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2543 * and optionally a mask entry. Ensure this is the case.
2544 */
2545
2546 print_canon_ace_list( "file ace - before valid", file_ace);
2547
2548 ok = ensure_canon_entry_valid_on_set(
2549 fsp->conn,
2550 &file_ace,
2551 false,
2552 fsp->conn->params,
2553 fsp->fsp_flags.is_directory,
2554 pfile_owner_sid,
2555 pfile_grp_sid,
2556 pst);
2557 if (!ok) {
2558 free_canon_ace_list(file_ace);
2559 free_canon_ace_list(dir_ace);
2560 return False;
2561 }
2562
2563 print_canon_ace_list( "dir ace - before valid", dir_ace);
2564
2565 if (dir_ace != NULL) {
2566 ok = ensure_canon_entry_valid_on_set(
2567 fsp->conn,
2568 &dir_ace,
2569 true,
2570 fsp->conn->params,
2571 fsp->fsp_flags.is_directory,
2572 pfile_owner_sid,
2573 pfile_grp_sid,
2574 pst);
2575 if (!ok) {
2576 free_canon_ace_list(file_ace);
2577 free_canon_ace_list(dir_ace);
2578 return False;
2579 }
2580 }
2581
2582 print_canon_ace_list( "file ace - return", file_ace);
2583 print_canon_ace_list( "dir ace - return", dir_ace);
2584
2585 *ppfile_ace = file_ace;
2586 *ppdir_ace = dir_ace;
2587 return True;
2588
2589 }
2590
2591 /******************************************************************************
2592 When returning permissions, try and fit NT display
2593 semantics if possible. Note the the canon_entries here must have been malloced.
2594 The list format should be - first entry = owner, followed by group and other user
2595 entries, last entry = other.
2596
2597 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2598 are not ordered, and match on the most specific entry rather than walking a list,
2599 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2600
2601 Entry 0: owner : deny all except read and write.
2602 Entry 1: owner : allow read and write.
2603 Entry 2: group : deny all except read.
2604 Entry 3: group : allow read.
2605 Entry 4: Everyone : allow read.
2606
2607 But NT cannot display this in their ACL editor !
2608 ********************************************************************************/
2609
2610 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2611 {
2612 canon_ace *l_head = *pp_list_head;
2613 canon_ace *owner_ace = NULL;
2614 canon_ace *other_ace = NULL;
2615 canon_ace *ace = NULL;
2616
2617 for (ace = l_head; ace; ace = ace->next) {
2618 if (ace->type == SMB_ACL_USER_OBJ)
2619 owner_ace = ace;
2620 else if (ace->type == SMB_ACL_OTHER) {
2621 /* Last ace - this is "other" */
2622 other_ace = ace;
2623 }
2624 }
2625
2626 if (!owner_ace || !other_ace) {
2627 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2628 filename ));
2629 return;
2630 }
2631
2632 /*
2633 * The POSIX algorithm applies to owner first, and other last,
2634 * so ensure they are arranged in this order.
2635 */
2636
2637 if (owner_ace) {
2638 DLIST_PROMOTE(l_head, owner_ace);
2639 }
2640
2641 if (other_ace) {
2642 DLIST_DEMOTE(l_head, other_ace);
2643 }
2644
2645 /* We have probably changed the head of the list. */
2646
2647 *pp_list_head = l_head;
2648 }
2649
2650 /****************************************************************************
2651 Create a linked list of canonical ACE entries.
2652 ****************************************************************************/
2653
2654 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2655 const char *fname, SMB_ACL_T posix_acl,
2656 const SMB_STRUCT_STAT *psbuf,
2657 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2658 {
2659 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2660 canon_ace *l_head = NULL;
2661 canon_ace *ace = NULL;
2662 canon_ace *next_ace = NULL;
2663 int entry_id = SMB_ACL_FIRST_ENTRY;
2664 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2665 SMB_ACL_ENTRY_T entry;
2666 size_t ace_count;
2667
2668 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2669 SMB_ACL_TAG_T tagtype;
2670 SMB_ACL_PERMSET_T permset;
2671 struct dom_sid sid;
2672 struct unixid unix_ug;
2673 enum ace_owner owner_type;
2674
2675 entry_id = SMB_ACL_NEXT_ENTRY;
2676
2677 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2678 continue;
2679
2680 if (sys_acl_get_permset(entry, &permset) == -1)
2681 continue;
2682
2683 /* Decide which SID to use based on the ACL type. */
2684 switch(tagtype) {
2685 case SMB_ACL_USER_OBJ:
2686 /* Get the SID from the owner. */
2687 sid_copy(&sid, powner);
2688 unix_ug.type = ID_TYPE_UID;
2689 unix_ug.id = psbuf->st_ex_uid;
2690 owner_type = UID_ACE;
2691 break;
2692 case SMB_ACL_USER:
2693 {
2694 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2695 if (puid == NULL) {
2696 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2697 continue;
2698 }
2699 uid_to_sid( &sid, *puid);
2700 unix_ug.type = ID_TYPE_UID;
2701 unix_ug.id = *puid;
2702 owner_type = UID_ACE;
2703 break;
2704 }
2705 case SMB_ACL_GROUP_OBJ:
2706 /* Get the SID from the owning group. */
2707 sid_copy(&sid, pgroup);
2708 unix_ug.type = ID_TYPE_GID;
2709 unix_ug.id = psbuf->st_ex_gid;
2710 owner_type = GID_ACE;
2711 break;
2712 case SMB_ACL_GROUP:
2713 {
2714 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2715 if (pgid == NULL) {
2716 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2717 continue;
2718 }
2719 gid_to_sid( &sid, *pgid);
2720 unix_ug.type = ID_TYPE_GID;
2721 unix_ug.id = *pgid;
2722 owner_type = GID_ACE;
2723 break;
2724 }
2725 case SMB_ACL_MASK:
2726 acl_mask = convert_permset_to_mode_t(permset);
2727 continue; /* Don't count the mask as an entry. */
2728 case SMB_ACL_OTHER:
2729 /* Use the Everyone SID */
2730 sid = global_sid_World;
2731 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2732 unix_ug.id = -1;
2733 owner_type = WORLD_ACE;
2734 break;
2735 default:
2736 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2737 continue;
2738 }
2739
2740 /*
2741 * Add this entry to the list.
2742 */
2743
2744 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2745 goto fail;
2746
2747 *ace = (canon_ace) {
2748 .type = tagtype,
2749 .perms = convert_permset_to_mode_t(permset),
2750 .attr = ALLOW_ACE,
2751 .trustee = sid,
2752 .unix_ug = unix_ug,
2753 .owner_type = owner_type
2754 };
2755 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2756
2757 DLIST_ADD(l_head, ace);
2758 }
2759
2760 /*
2761 * This next call will ensure we have at least a user/group/world set.
2762 */
2763
2764 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2765 powner, pgroup,
2766 psbuf))
2767 goto fail;
2768
2769 /*
2770 * Now go through the list, masking the permissions with the
2771 * acl_mask. Ensure all DENY Entries are at the start of the list.
2772 */
2773
2774 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2775
2776 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2777 next_ace = ace->next;
2778
2779 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2780 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2781 ace->perms &= acl_mask;
2782
2783 if (ace->perms == 0) {
2784 DLIST_PROMOTE(l_head, ace);
2785 }
2786
2787 if( DEBUGLVL( 10 ) ) {
2788 print_canon_ace(ace, ace_count);
2789 }
2790 }
2791
2792 arrange_posix_perms(fname,&l_head );
2793
2794 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2795
2796 return l_head;
2797
2798 fail:
2799
2800 free_canon_ace_list(l_head);
2801 return NULL;
2802 }
2803
2804 /****************************************************************************
2805 Check if the current user group list contains a given group.
2806 ****************************************************************************/
2807
2808 bool current_user_in_group(connection_struct *conn, gid_t gid)
2809 {
2810 uint32_t i;
2811 const struct security_unix_token *utok = get_current_utok(conn);
2812
2813 for (i = 0; i < utok->ngroups; i++) {
2814 if (utok->groups[i] == gid) {
2815 return True;
2816 }
2817 }
2818
2819 return False;
2820 }
2821
2822 /****************************************************************************
2823 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2824 ****************************************************************************/
2825
2826 static bool acl_group_override(connection_struct *conn,
2827 const struct smb_filename *smb_fname)
2828 {
2829 if ((errno != EPERM) && (errno != EACCES)) {
2830 return false;
2831 }
2832
2833 /* file primary group == user primary or supplementary group */
2834 if (lp_acl_group_control(SNUM(conn)) &&
2835 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2836 return true;
2837 }
2838
2839 /* user has writeable permission */
2840 if (lp_dos_filemode(SNUM(conn)) &&
2841 can_write_to_file(conn,
2842 conn->cwd_fsp,
2843 smb_fname))
2844 {
2845 return true;
2846 }
2847
2848 return false;
2849 }
2850
2851 /****************************************************************************
2852 Attempt to apply an ACL to a file or directory.
2853 ****************************************************************************/
2854
2855 static bool set_canon_ace_list(files_struct *fsp,
2856 canon_ace *the_ace,
2857 bool default_ace,
2858 const SMB_STRUCT_STAT *psbuf,
2859 bool *pacl_set_support)
2860 {
2861 connection_struct *conn = fsp->conn;
2862 bool ret = False;
2863 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2864 canon_ace *p_ace;
2865 int i;
2866 SMB_ACL_ENTRY_T mask_entry;
2867 bool got_mask_entry = False;
2868 SMB_ACL_PERMSET_T mask_permset;
2869 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2870 bool needs_mask = False;
2871 mode_t mask_perms = 0;
2872
2873 /* Use the psbuf that was passed in. */
2874 if (psbuf != &fsp->fsp_name->st) {
2875 fsp->fsp_name->st = *psbuf;
2876 }
2877
2878 #if defined(POSIX_ACL_NEEDS_MASK)
2879 /* HP-UX always wants to have a mask (called "class" there). */
2880 needs_mask = True;
2881 #endif
2882
2883 if (the_acl == NULL) {
2884 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2885 return false;
2886 }
2887
2888 if( DEBUGLVL( 10 )) {
2889 dbgtext("set_canon_ace_list: setting ACL:\n");
2890 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2891 print_canon_ace( p_ace, i);
2892 }
2893 }
2894
2895 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2896 SMB_ACL_ENTRY_T the_entry;
2897 SMB_ACL_PERMSET_T the_permset;
2898
2899 /*
2900 * ACLs only "need" an ACL_MASK entry if there are any named user or
2901 * named group entries. But if there is an ACL_MASK entry, it applies
2902 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2903 * so that it doesn't deny (i.e., mask off) any permissions.
2904 */
2905
2906 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2907 needs_mask = True;
2908 mask_perms |= p_ace->perms;
2909 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2910 mask_perms |= p_ace->perms;
2911 }
2912
2913 /*
2914 * Get the entry for this ACE.
2915 */
2916
2917 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2918 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2919 i, strerror(errno) ));
2920 goto fail;
2921 }
2922
2923 if (p_ace->type == SMB_ACL_MASK) {
2924 mask_entry = the_entry;
2925 got_mask_entry = True;
2926 }
2927
2928 /*
2929 * Ok - we now know the ACL calls should be working, don't
2930 * allow fallback to chmod.
2931 */
2932
2933 *pacl_set_support = True;
2934
2935 /*
2936 * Initialise the entry from the canon_ace.
2937 */
2938
2939 /*
2940 * First tell the entry what type of ACE this is.
2941 */
2942
2943 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2944 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2945 i, strerror(errno) ));
2946 goto fail;
2947 }
2948
2949 /*
2950 * Only set the qualifier (user or group id) if the entry is a user
2951 * or group id ACE.
2952 */
2953
2954 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2955 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2956 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2957 i, strerror(errno) ));
2958 goto fail;
2959 }
2960 }
2961
2962 /*
2963 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2964 */
2965
2966 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2967 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2968 i, strerror(errno) ));
2969 goto fail;
2970 }
2971
2972 if (map_acl_perms_to_permset(p_ace->perms, &the_permset) == -1) {
2973 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2974 (unsigned int)p_ace->perms, i, strerror(errno) ));
2975 goto fail;
2976 }
2977
2978 /*
2979 * ..and apply them to the entry.
2980 */
2981
2982 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2983 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2984 i, strerror(errno) ));
2985 goto fail;
2986 }
2987
2988 if( DEBUGLVL( 10 ))
2989 print_canon_ace( p_ace, i);
2990
2991 }
2992
2993 if (needs_mask && !got_mask_entry) {
2994 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2995 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2996 goto fail;
2997 }
2998
2999 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
3000 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
3001 goto fail;
3002 }
3003
3004 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
3005 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
3006 goto fail;
3007 }
3008
3009 if (map_acl_perms_to_permset(S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
3010 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
3011 goto fail;
3012 }
3013
3014 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
3015 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
3016 goto fail;
3017 }
3018 }
3019
3020 /*
3021 * Finally apply it to the file or directory.
3022 */
3023
3024 if (default_ace || fsp->fsp_flags.is_directory || fsp->fh->fd == -1) {
3025 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name,
3026 the_acl_type, the_acl) == -1) {
3027 /*
3028 * Some systems allow all the above calls and only fail with no ACL support
3029 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3030 */
3031 if (no_acl_syscall_error(errno)) {
3032 *pacl_set_support = False;
3033 }
3034
3035 if (acl_group_override(conn, fsp->fsp_name)) {
3036 int sret;
3037
3038 DEBUG(5,("set_canon_ace_list: acl group "
3039 "control on and current user in file "
3040 "%s primary group.\n",
3041 fsp_str_dbg(fsp)));
3042
3043 become_root();
3044 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3045 fsp->fsp_name, the_acl_type,
3046 the_acl);
3047 unbecome_root();
3048 if (sret == 0) {
3049 ret = True;
3050 }
3051 }
3052
3053 if (ret == False) {
3054 DEBUG(2,("set_canon_ace_list: "
3055 "sys_acl_set_file type %s failed for "
3056 "file %s (%s).\n",
3057 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3058 "directory default" : "file",
3059 fsp_str_dbg(fsp), strerror(errno)));
3060 goto fail;
3061 }
3062 }
3063 } else {
3064 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3065 /*
3066 * Some systems allow all the above calls and only fail with no ACL support
3067 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3068 */
3069 if (no_acl_syscall_error(errno)) {
3070 *pacl_set_support = False;
3071 }
3072
3073 if (acl_group_override(conn, fsp->fsp_name)) {
3074 int sret;
3075
3076 DEBUG(5,("set_canon_ace_list: acl group "
3077 "control on and current user in file "
3078 "%s primary group.\n",
3079 fsp_str_dbg(fsp)));
3080
3081 become_root();
3082 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3083 unbecome_root();
3084 if (sret == 0) {
3085 ret = True;
3086 }
3087 }
3088
3089 if (ret == False) {
3090 DEBUG(2,("set_canon_ace_list: "
3091 "sys_acl_set_file failed for file %s "
3092 "(%s).\n",
3093 fsp_str_dbg(fsp), strerror(errno)));
3094 goto fail;
3095 }
3096 }
3097 }
3098
3099 ret = True;
3100
3101 fail:
3102
3103 if (the_acl != NULL) {
3104 TALLOC_FREE(the_acl);
3105 }
3106
3107 return ret;
3108 }
3109
3110 /****************************************************************************
3111
3112 ****************************************************************************/
3113
3114 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3115 {
3116 SMB_ACL_ENTRY_T entry;
3117
3118 if (!the_acl)
3119 return NULL;
3120 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3121 TALLOC_FREE(the_acl);
3122 return NULL;
3123 }
3124 return the_acl;
3125 }
3126
3127 /****************************************************************************
3128 Convert a canon_ace to a generic 3 element permission - if possible.
3129 ****************************************************************************/
3130
3131 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3132
3133 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3134 {
3135 size_t ace_count = count_canon_ace_list(file_ace_list);
3136 canon_ace *ace_p;
3137 canon_ace *owner_ace = NULL;
3138 canon_ace *group_ace = NULL;
3139 canon_ace *other_ace = NULL;
3140
3141 if (ace_count > 5) {
3142 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3143 "entries for file %s to convert to posix perms.\n",
3144 fsp_str_dbg(fsp)));
3145 return False;
3146 }
3147
3148 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3149 if (ace_p->owner_type == UID_ACE)
3150 owner_ace = ace_p;
3151 else if (ace_p->owner_type == GID_ACE)
3152 group_ace = ace_p;
3153 else if (ace_p->owner_type == WORLD_ACE)
3154 other_ace = ace_p;
3155 }
3156
3157 if (!owner_ace || !group_ace || !other_ace) {
3158 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3159 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3160 return False;
3161 }
3162
3163 /*
3164 * Ensure all ACE entries are owner, group or other.
3165 * We can't set if there are any other SIDs.
3166 */
3167 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3168 if (ace_p == owner_ace || ace_p == group_ace ||
3169 ace_p == other_ace) {
3170 continue;
3171 }
3172 if (ace_p->owner_type == UID_ACE) {
3173 if (ace_p->unix_ug.id != owner_ace->unix_ug.id) {
3174 DEBUG(3,("Invalid uid %u in ACE for file %s.\n",
3175 (unsigned int)ace_p->unix_ug.id,
3176 fsp_str_dbg(fsp)));
3177 return false;
3178 }
3179 } else if (ace_p->owner_type == GID_ACE) {
3180 if (ace_p->unix_ug.id != group_ace->unix_ug.id) {
3181 DEBUG(3,("Invalid gid %u in ACE for file %s.\n",
3182 (unsigned int)ace_p->unix_ug.id,
3183 fsp_str_dbg(fsp)));
3184 return false;
3185 }
3186 } else {
3187 /*
3188 * There should be no duplicate WORLD_ACE entries.
3189 */
3190
3191 DEBUG(3,("Invalid type %u, uid %u in "
3192 "ACE for file %s.\n",
3193 (unsigned int)ace_p->owner_type,
3194 (unsigned int)ace_p->unix_ug.id,
3195 fsp_str_dbg(fsp)));
3196 return false;
3197 }
3198 }
3199
3200 *posix_perms = (mode_t)0;
3201
3202 *posix_perms |= owner_ace->perms;
3203 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3204 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3205 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3206 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3207 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3208 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3209
3210 /* The owner must have at least read access. */
3211
3212 *posix_perms |= S_IRUSR;
3213 if (fsp->fsp_flags.is_directory)
3214 *posix_perms |= (S_IWUSR|S_IXUSR);
3215
3216 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3217 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3218 (int)group_ace->perms, (int)other_ace->perms,
3219 (int)*posix_perms, fsp_str_dbg(fsp)));
3220
3221 return True;
3222 }
3223
3224 /****************************************************************************
3225 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3226 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3227 with CI|OI set so it is inherited and also applies to the directory.
3228 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3229 ****************************************************************************/
3230
3231 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3232 {
3233 size_t i, j;
3234
3235 for (i = 0; i < num_aces; i++) {
3236 for (j = i+1; j < num_aces; j++) {
3237 uint32_t i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3238 uint32_t j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3239 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3240 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3241
3242 /* We know the lower number ACE's are file entries. */
3243 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3244 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3245 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3246 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3247 (i_inh == j_inh) &&
3248 (i_flags_ni == 0) &&
3249 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3250 SEC_ACE_FLAG_CONTAINER_INHERIT|
3251 SEC_ACE_FLAG_INHERIT_ONLY))) {
3252 /*
3253 * W2K wants to have access allowed zero access ACE's
3254 * at the end of the list. If the mask is zero, merge
3255 * the non-inherited ACE onto the inherited ACE.
3256 */
3257
3258 if (nt_ace_list[i].access_mask == 0) {
3259 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3260 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3261 ARRAY_DEL_ELEMENT(nt_ace_list, i, num_aces);
3262
3263 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3264 (unsigned int)i, (unsigned int)j ));
3265 } else {
3266 /*
3267 * These are identical except for the flags.
3268 * Merge the inherited ACE onto the non-inherited ACE.
3269 */
3270
3271 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3272 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3273 ARRAY_DEL_ELEMENT(nt_ace_list, j, num_aces);
3274
3275 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3276 (unsigned int)j, (unsigned int)i ));
3277 }
3278 num_aces--;
3279 break;
3280 }
3281 }
3282 }
3283
3284 return num_aces;
3285 }
3286
3287
3288 /****************************************************************************
3289 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3290 the space for the return elements and returns the size needed to return the
3291 security descriptor. This should be the only external function needed for
3292 the UNIX style get ACL.
3293 ****************************************************************************/
3294
3295 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3296 const char *name,
3297 const SMB_STRUCT_STAT *sbuf,
3298 struct pai_val *pal,
3299 SMB_ACL_T posix_acl,
3300 SMB_ACL_T def_acl,
3301 uint32_t security_info,
3302 TALLOC_CTX *mem_ctx,
3303 struct security_descriptor **ppdesc)
3304 {
3305 struct dom_sid owner_sid;
3306 struct dom_sid group_sid;
3307 size_t sd_size = 0;
3308 struct security_acl *psa = NULL;
3309 size_t num_acls = 0;
3310 size_t num_def_acls = 0;
3311 size_t num_aces = 0;
3312 canon_ace *file_ace = NULL;
3313 canon_ace *dir_ace = NULL;
3314 struct security_ace *nt_ace_list = NULL;
3315 struct security_descriptor *psd = NULL;
3316
3317 /*
3318 * Get the owner, group and world SIDs.
3319 */
3320
3321 create_file_sids(sbuf, &owner_sid, &group_sid);
3322
3323 if (security_info & SECINFO_DACL) {
3324
3325 /*
3326 * In the optimum case Creator Owner and Creator Group would be used for
3327 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3328 * would lead to usability problems under Windows: The Creator entries
3329 * are only available in browse lists of directories and not for files;
3330 * additionally the identity of the owning group couldn't be determined.
3331 * We therefore use those identities only for Default ACLs.
3332 */
3333
3334 /* Create the canon_ace lists. */
3335 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3336 &owner_sid, &group_sid, pal,
3337 SMB_ACL_TYPE_ACCESS);
3338
3339 /* We must have *some* ACLS. */
3340
3341 if (count_canon_ace_list(file_ace) == 0) {
3342 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3343 goto done;
3344 }
3345
3346 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3347 dir_ace = canonicalise_acl(conn, name, def_acl,
3348 sbuf,
3349 &global_sid_Creator_Owner,
3350 &global_sid_Creator_Group,
3351 pal, SMB_ACL_TYPE_DEFAULT);
3352 }
3353
3354 /*
3355 * Create the NT ACE list from the canonical ace lists.
3356 */
3357
3358 {
3359 canon_ace *ace;
3360 enum security_ace_type nt_acl_type;
3361
3362 num_acls = count_canon_ace_list(file_ace);
3363 num_def_acls = count_canon_ace_list(dir_ace);
3364
3365 nt_ace_list = talloc_zero_array(
3366 talloc_tos(), struct security_ace,
3367 num_acls + num_def_acls);
3368
3369 if (nt_ace_list == NULL) {
3370 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3371 goto done;
3372 }
3373
3374 /*
3375 * Create the NT ACE list from the canonical ace lists.
3376 */
3377
3378 for (ace = file_ace; ace != NULL; ace = ace->next) {
3379 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3380 &nt_acl_type,
3381 ace->perms,
3382 S_ISDIR(sbuf->st_ex_mode));
3383 init_sec_ace(&nt_ace_list[num_aces++],
3384 &ace->trustee,
3385 nt_acl_type,
3386 acc,
3387 ace->ace_flags);
3388 }
3389
3390 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3391 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3392 &nt_acl_type,
3393 ace->perms,
3394 S_ISDIR(sbuf->st_ex_mode));
3395 init_sec_ace(&nt_ace_list[num_aces++],
3396 &ace->trustee,
3397 nt_acl_type,
3398 acc,
3399 ace->ace_flags |
3400 SEC_ACE_FLAG_OBJECT_INHERIT|
3401 SEC_ACE_FLAG_CONTAINER_INHERIT|
3402 SEC_ACE_FLAG_INHERIT_ONLY);
3403 }
3404
3405 /*
3406 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3407 * Win2K needs this to get the inheritance correct when replacing ACLs
3408 * on a directory tree. Based on work by Jim @ IBM.
3409 */
3410
3411 num_aces = merge_default_aces(nt_ace_list, num_aces);
3412 }
3413
3414 if (num_aces) {
3415 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3416 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3417 goto done;
3418 }
3419 }
3420 } /* security_info & SECINFO_DACL */
3421
3422 psd = make_standard_sec_desc(mem_ctx,
3423 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3424 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3425 psa,
3426 &sd_size);
3427
3428 if(!psd) {
3429 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3430 sd_size = 0;
3431 goto done;
3432 }
3433
3434 /*
3435 * Windows 2000: The DACL_PROTECTED flag in the security
3436 * descriptor marks the ACL as non-inheriting, i.e., no
3437 * ACEs from higher level directories propagate to this
3438 * ACL. In the POSIX ACL model permissions are only
3439 * inherited at file create time, so ACLs never contain
3440 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3441 * flag doesn't seem to bother Windows NT.
3442 * Always set this if map acl inherit is turned off.
3443 */
3444 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3445 psd->type |= SEC_DESC_DACL_PROTECTED;
3446 } else {
3447 psd->type |= pal->sd_type;
3448 }
3449
3450 if (psd->dacl) {
3451 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3452 }
3453
3454 *ppdesc = psd;
3455
3456 done:
3457
3458 if (posix_acl) {
3459 TALLOC_FREE(posix_acl);
3460 }
3461 if (def_acl) {
3462 TALLOC_FREE(def_acl);
3463 }
3464 free_canon_ace_list(file_ace);
3465 free_canon_ace_list(dir_ace);
3466 free_inherited_info(pal);
3467 TALLOC_FREE(nt_ace_list);
3468
3469 return NT_STATUS_OK;
3470 }
3471
3472 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3473 TALLOC_CTX *mem_ctx,
3474 struct security_descriptor **ppdesc)
3475 {
3476 SMB_STRUCT_STAT sbuf;
3477 SMB_ACL_T posix_acl = NULL;
3478 struct pai_val *pal;
3479 TALLOC_CTX *frame = talloc_stackframe();
3480 NTSTATUS status;
3481
3482 *ppdesc = NULL;
3483
3484 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3485 fsp_str_dbg(fsp)));
3486
3487 /* Get the stat struct for the owner info. */
3488 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3489 TALLOC_FREE(frame);
3490 return map_nt_error_from_unix(errno);
3491 }
3492
3493 /* Get the ACL from the fd. */
3494 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3495
3496 pal = fload_inherited_info(fsp);
3497
3498 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3499 &sbuf, pal, posix_acl, NULL,
3500 security_info, mem_ctx, ppdesc);
3501 TALLOC_FREE(frame);
3502 return status;
3503 }
3504
3505 NTSTATUS posix_get_nt_acl(struct connection_struct *conn,
3506 const struct smb_filename *smb_fname_in,
3507 uint32_t security_info,
3508 TALLOC_CTX *mem_ctx,
3509 struct security_descriptor **ppdesc)
3510 {
3511 SMB_ACL_T posix_acl = NULL;
3512 SMB_ACL_T def_acl = NULL;
3513 struct pai_val *pal;
3514 struct smb_filename *smb_fname = NULL;
3515 int ret;
3516 TALLOC_CTX *frame = talloc_stackframe();
3517 NTSTATUS status;
3518
3519 *ppdesc = NULL;
3520
3521 DEBUG(10,("posix_get_nt_acl: called for file %s\n",
3522 smb_fname_in->base_name ));
3523
3524 smb_fname = cp_smb_filename(talloc_tos(), smb_fname_in);
3525 if (smb_fname == NULL) {
3526 TALLOC_FREE(frame);
3527 return NT_STATUS_NO_MEMORY;
3528 }
3529
3530 /* Get the stat struct for the owner info. */
3531 /*
3532 * We can directly use SMB_VFS_STAT here, as if this was a
3533 * POSIX call on a symlink, we've already refused it.
3534 * For a Windows acl mapped call on a symlink, we want to follow
3535 * it.
3536 */
3537 ret = SMB_VFS_STAT(conn, smb_fname);
3538
3539 if (ret == -1) {
3540 TALLOC_FREE(frame);
3541 return map_nt_error_from_unix(errno);
3542 }
3543
3544 /* Get the ACL from the path. */
3545 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3546 SMB_ACL_TYPE_ACCESS, frame);
3547
3548 /* If it's a directory get the default POSIX ACL. */
3549 if(S_ISDIR(smb_fname->st.st_ex_mode)) {
3550 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3551 SMB_ACL_TYPE_DEFAULT, frame);
3552 def_acl = free_empty_sys_acl(conn, def_acl);
3553 }
3554
3555 pal = load_inherited_info(conn, smb_fname);
3556
3557 status = posix_get_nt_acl_common(conn,
3558 smb_fname->base_name,
3559 &smb_fname->st,
3560 pal,
3561 posix_acl,
3562 def_acl,
3563 security_info,
3564 mem_ctx,
3565 ppdesc);
3566 TALLOC_FREE(frame);
3567 return status;
3568 }
3569
3570 /****************************************************************************
3571 Try to chown a file. We will be able to chown it under the following conditions.
3572
3573 1) If we have root privileges, then it will just work.
3574 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3575 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3576 4) If we have write permission to the file and dos_filemodes is set
3577 then allow chown to the currently authenticated user.
3578 ****************************************************************************/
3579
3580 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3581 {
3582 NTSTATUS status;
3583 int ret;
3584
3585 if(!CAN_WRITE(fsp->conn)) {
3586 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3587 }
3588
3589 /* Case (1). */
3590 ret = SMB_VFS_FCHOWN(fsp, uid, gid);
3591 if (ret == 0) {
3592 return NT_STATUS_OK;
3593 }
3594
3595 /* Case (2) / (3) */
3596 if (lp_enable_privileges()) {
3597 bool has_take_ownership_priv = security_token_has_privilege(
3598 get_current_nttok(fsp->conn),
3599 SEC_PRIV_TAKE_OWNERSHIP);
3600 bool has_restore_priv = security_token_has_privilege(
3601 get_current_nttok(fsp->conn),
3602 SEC_PRIV_RESTORE);
3603
3604 if (has_restore_priv) {
3605 ; /* Case (2) */
3606 } else if (has_take_ownership_priv) {
3607 /* Case (3) */
3608 if (uid == get_current_uid(fsp->conn)) {
3609 gid = (gid_t)-1;
3610 } else {
3611 has_take_ownership_priv = false;
3612 }
3613 }
3614
3615 if (has_take_ownership_priv || has_restore_priv) {
3616 status = NT_STATUS_OK;
3617 become_root();
3618 ret = SMB_VFS_FCHOWN(fsp, uid, gid);
3619 if (ret != 0) {
3620 status = map_nt_error_from_unix(errno);
3621 }
3622 unbecome_root();
3623 return status;
3624 }
3625 }
3626
3627 /* Case (4). */
3628 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3629 return NT_STATUS_ACCESS_DENIED;
3630 }
3631
3632 /* only allow chown to the current user. This is more secure,
3633 and also copes with the case where the SID in a take ownership ACL is
3634 a local SID on the users workstation
3635 */
3636 if (uid != get_current_uid(fsp->conn)) {
3637 return NT_STATUS_INVALID_OWNER;
3638 }
3639
3640 status = NT_STATUS_OK;
3641 become_root();
3642 /* Keep the current file gid the same. */
3643 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3644 if (ret != 0) {
3645 status = map_nt_error_from_unix(errno);
3646 }
3647 unbecome_root();
3648
3649 return status;
3650 }
3651
3652 /****************************************************************************
3653 Reply to set a security descriptor on an fsp. security_info_sent is the
3654 description of the following NT ACL.
3655 This should be the only external function needed for the UNIX style set ACL.
3656 We make a copy of psd_orig as internal functions modify the elements inside
3657 it, even though it's a const pointer.
3658 ****************************************************************************/
3659
3660 NTSTATUS set_nt_acl(files_struct *fsp, uint32_t security_info_sent, const struct security_descriptor *psd_orig)
3661 {
3662 connection_struct *conn = fsp->conn;
3663 uid_t user = (uid_t)-1;
3664 gid_t grp = (gid_t)-1;
3665 struct dom_sid file_owner_sid;
3666 struct dom_sid file_grp_sid;
3667 canon_ace *file_ace_list = NULL;
3668 canon_ace *dir_ace_list = NULL;
3669 bool acl_perms = False;
3670 mode_t orig_mode = (mode_t)0;
3671 NTSTATUS status;
3672 bool set_acl_as_root = false;
3673 bool acl_set_support = false;
3674 bool ret = false;
3675 struct security_descriptor *psd = NULL;
3676
3677 DEBUG(10,("set_nt_acl: called for file %s\n",
3678 fsp_str_dbg(fsp)));
3679
3680 if (!CAN_WRITE(conn)) {
3681 DEBUG(10,("set acl rejected on read-only share\n"));
3682 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3683 }
3684
3685 if (psd_orig == NULL) {
3686 return NT_STATUS_INVALID_PARAMETER;
3687 }
3688
3689 /*
3690 * MS NFS mode, here's the deal: the client merely wants to
3691 * modify the mode, but roundtripping get_acl/set/acl would
3692 * add additional POSIX ACEs. So in case we get a request
3693 * containing a MS NFS mode SID, we do nothing here.
3694 */
3695 if (security_descriptor_with_ms_nfs(psd_orig)) {
3696 return NT_STATUS_OK;
3697 }
3698
3699 psd = security_descriptor_copy(talloc_tos(), psd_orig);
3700 if (psd == NULL) {
3701 return NT_STATUS_NO_MEMORY;
3702 }
3703
3704 /*
3705 * Get the current state of the file.
3706 */
3707
3708 status = vfs_stat_fsp(fsp);
3709 if (!NT_STATUS_IS_OK(status)) {
3710 return status;
3711 }
3712
3713 /* Save the original element we check against. */
3714 orig_mode = fsp->fsp_name->st.st_ex_mode;
3715
3716 /*
3717 * Unpack the user/group/world id's.
3718 */
3719
3720 /* POSIX can't cope with missing owner/group. */
3721 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3722 security_info_sent &= ~SECINFO_OWNER;
3723 }
3724 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3725 security_info_sent &= ~SECINFO_GROUP;
3726 }
3727
3728 /* If UNIX owner is inherited and Windows isn't, then
3729 * setting the UNIX owner based on Windows owner conflicts
3730 * with the inheritance rule
3731 */
3732 if (lp_inherit_owner(SNUM(conn)) == INHERIT_OWNER_UNIX_ONLY) {
3733 security_info_sent &= ~SECINFO_OWNER;
3734 }
3735
3736 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3737 if (!NT_STATUS_IS_OK(status)) {
3738 return status;
3739 }
3740
3741 /*
3742 * Do we need to chown ? If so this must be done first as the incoming
3743 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3744 * Noticed by Simo.
3745 */
3746
3747 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3748 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3749
3750 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3751 fsp_str_dbg(fsp), (unsigned int)user,
3752 (unsigned int)grp));
3753
3754 status = try_chown(fsp, user, grp);
3755 if(!NT_STATUS_IS_OK(status)) {
3756 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3757 "= %s.\n", fsp_str_dbg(fsp),
3758 (unsigned int)user,
3759 (unsigned int)grp,
3760 nt_errstr(status)));
3761 return status;
3762 }
3763
3764 /*
3765 * Recheck the current state of the file, which may have changed.
3766 * (suid/sgid bits, for instance)
3767 */
3768
3769 status = vfs_stat_fsp(fsp);
3770 if (!NT_STATUS_IS_OK(status)) {
3771 return status;
3772 }
3773
3774 /* Save the original element we check against. */
3775 orig_mode = fsp->fsp_name->st.st_ex_mode;
3776
3777 /* If we successfully chowned, we know we must
3778 * be able to set the acl, so do it as root.
3779 */
3780 set_acl_as_root = true;
3781 }
3782
3783 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3784
3785 if((security_info_sent & SECINFO_DACL) &&
3786 (psd->type & SEC_DESC_DACL_PRESENT) &&
3787 (psd->dacl == NULL)) {
3788 struct security_ace ace[3];
3789
3790 /* We can't have NULL DACL in POSIX.
3791 Use owner/group/Everyone -> full access. */
3792
3793 init_sec_ace(&ace[0],
3794 &file_owner_sid,
3795 SEC_ACE_TYPE_ACCESS_ALLOWED,
3796 GENERIC_ALL_ACCESS,
3797 0);
3798 init_sec_ace(&ace[1],
3799 &file_grp_sid,
3800 SEC_ACE_TYPE_ACCESS_ALLOWED,
3801 GENERIC_ALL_ACCESS,
3802 0);
3803 init_sec_ace(&ace[2],
3804 &global_sid_World,
3805 SEC_ACE_TYPE_ACCESS_ALLOWED,
3806 GENERIC_ALL_ACCESS,
3807 0);
3808 psd->dacl = make_sec_acl(talloc_tos(),
3809 NT4_ACL_REVISION,
3810 3,
3811 ace);
3812 if (psd->dacl == NULL) {
3813 return NT_STATUS_NO_MEMORY;
3814 }
3815 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3816 }
3817
3818 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3819 &file_grp_sid, &file_ace_list,
3820 &dir_ace_list, security_info_sent, psd);
3821
3822 /* Ignore W2K traverse DACL set. */
3823 if (!file_ace_list && !dir_ace_list) {
3824 return NT_STATUS_OK;
3825 }
3826
3827 if (!acl_perms) {
3828 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3829 free_canon_ace_list(file_ace_list);
3830 free_canon_ace_list(dir_ace_list);
3831 return NT_STATUS_ACCESS_DENIED;
3832 }
3833
3834 /*
3835 * Only change security if we got a DACL.
3836 */
3837
3838 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3839 free_canon_ace_list(file_ace_list);
3840 free_canon_ace_list(dir_ace_list);
3841 return NT_STATUS_OK;
3842 }
3843
3844 /*
3845 * Try using the POSIX ACL set first. Fall back to chmod if
3846 * we have no ACL support on this filesystem.
3847 */
3848
3849 if (acl_perms && file_ace_list) {
3850 if (set_acl_as_root) {
3851 become_root();
3852 }
3853 ret = set_canon_ace_list(fsp, file_ace_list, false,
3854 &fsp->fsp_name->st, &acl_set_support);
3855 if (set_acl_as_root) {
3856 unbecome_root();
3857 }
3858 if (acl_set_support && ret == false) {
3859 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3860 "%s (%s).\n", fsp_str_dbg(fsp),
3861 strerror(errno)));
3862 free_canon_ace_list(file_ace_list);
3863 free_canon_ace_list(dir_ace_list);
3864 return map_nt_error_from_unix(errno);
3865 }
3866 }
3867
3868 if (acl_perms && acl_set_support && fsp->fsp_flags.is_directory) {
3869 if (dir_ace_list) {
3870 if (set_acl_as_root) {
3871 become_root();
3872 }
3873 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3874 &fsp->fsp_name->st,
3875 &acl_set_support);
3876 if (set_acl_as_root) {
3877 unbecome_root();
3878 }
3879 if (ret == false) {
3880 DEBUG(3,("set_nt_acl: failed to set default "
3881 "acl on directory %s (%s).\n",
3882 fsp_str_dbg(fsp), strerror(errno)));
3883 free_canon_ace_list(file_ace_list);
3884 free_canon_ace_list(dir_ace_list);
3885 return map_nt_error_from_unix(errno);
3886 }
3887 } else {
3888 int sret = -1;
3889
3890 /*
3891 * No default ACL - delete one if it exists.
3892 */
3893
3894 if (set_acl_as_root) {
3895 become_root();
3896 }
3897 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3898 fsp->fsp_name);
3899 if (set_acl_as_root) {
3900 unbecome_root();
3901 }
3902 if (sret == -1) {
3903 if (acl_group_override(conn, fsp->fsp_name)) {
3904 DEBUG(5,("set_nt_acl: acl group "
3905 "control on and current user "
3906 "in file %s primary group. "
3907 "Override delete_def_acl\n",
3908 fsp_str_dbg(fsp)));
3909
3910 become_root();
3911 sret =
3912 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3913 conn,
3914 fsp->fsp_name);
3915 unbecome_root();
3916 }
3917
3918 if (sret == -1) {
3919 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3920 free_canon_ace_list(file_ace_list);
3921 free_canon_ace_list(dir_ace_list);
3922 return map_nt_error_from_unix(errno);
3923 }
3924 }
3925 }
3926 }
3927
3928 if (acl_set_support) {
3929 if (set_acl_as_root) {
3930 become_root();
3931 }
3932 store_inheritance_attributes(fsp,
3933 file_ace_list,
3934 dir_ace_list,
3935 psd->type);
3936 if (set_acl_as_root) {
3937 unbecome_root();
3938 }
3939 }
3940
3941 /*
3942 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3943 */
3944
3945 if(!acl_set_support && acl_perms) {
3946 mode_t posix_perms;
3947
3948 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3949 free_canon_ace_list(file_ace_list);
3950 free_canon_ace_list(dir_ace_list);
3951 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3952 "posix permissions for file %s.\n",
3953 fsp_str_dbg(fsp)));
3954 return NT_STATUS_ACCESS_DENIED;
3955 }
3956
3957 if (orig_mode != posix_perms) {
3958 int sret = -1;
3959
3960 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3961 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3962
3963 if (set_acl_as_root) {
3964 become_root();
3965 }
3966 sret = SMB_VFS_FCHMOD(fsp, posix_perms);
3967 if (set_acl_as_root) {
3968 unbecome_root();
3969 }
3970 if(sret == -1) {
3971 if (acl_group_override(conn, fsp->fsp_name)) {
3972 DEBUG(5,("set_nt_acl: acl group "
3973 "control on and current user "
3974 "in file %s primary group. "
3975 "Override chmod\n",
3976 fsp_str_dbg(fsp)));
3977
3978 become_root();
3979 sret = SMB_VFS_FCHMOD(fsp, posix_perms);
3980 unbecome_root();
3981 }
3982
3983 if (sret == -1) {
3984 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3985 "failed. Error = %s.\n",
3986 fsp_str_dbg(fsp),
3987 (unsigned int)posix_perms,
3988 strerror(errno)));
3989 free_canon_ace_list(file_ace_list);
3990 free_canon_ace_list(dir_ace_list);
3991 return map_nt_error_from_unix(errno);
3992 }
3993 }
3994 }
3995 }
3996
3997 free_canon_ace_list(file_ace_list);
3998 free_canon_ace_list(dir_ace_list);
3999
4000 /* Ensure the stat struct in the fsp is correct. */
4001 status = vfs_stat_fsp(fsp);
4002
4003 return NT_STATUS_OK;
4004 }
4005
4006 /****************************************************************************
4007 Get the actual group bits stored on a file with an ACL. Has no effect if
4008 the file has no ACL. Needed in dosmode code where the stat() will return
4009 the mask bits, not the real group bits, for a file with an ACL.
4010 ****************************************************************************/
4011
4012 int get_acl_group_bits( connection_struct *conn,
4013 const struct smb_filename *smb_fname,
4014 mode_t *mode )
4015 {
4016 int entry_id = SMB_ACL_FIRST_ENTRY;
4017 SMB_ACL_ENTRY_T entry;
4018 SMB_ACL_T posix_acl;
4019 int result = -1;
4020
4021 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4022 SMB_ACL_TYPE_ACCESS, talloc_tos());
4023 if (posix_acl == (SMB_ACL_T)NULL)
4024 return -1;
4025
4026 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4027 SMB_ACL_TAG_T tagtype;
4028 SMB_ACL_PERMSET_T permset;
4029
4030 entry_id = SMB_ACL_NEXT_ENTRY;
4031
4032 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4033 break;
4034
4035 if (tagtype == SMB_ACL_GROUP_OBJ) {
4036 if (sys_acl_get_permset(entry, &permset) == -1) {
4037 break;
4038 } else {
4039 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4040 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4041 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4042 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4043 result = 0;
4044 break;
4045 }
4046 }
4047 }
4048 TALLOC_FREE(posix_acl);
4049 return result;
4050 }
4051
4052 /****************************************************************************
4053 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4054 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4055 ****************************************************************************/
4056
4057 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4058 {
4059 int entry_id = SMB_ACL_FIRST_ENTRY;
4060 SMB_ACL_ENTRY_T entry;
4061 int num_entries = 0;
4062
4063 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4064 SMB_ACL_TAG_T tagtype;
4065 SMB_ACL_PERMSET_T permset;
4066 mode_t perms;
4067
4068 entry_id = SMB_ACL_NEXT_ENTRY;
4069
4070 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4071 return -1;
4072
4073 if (sys_acl_get_permset(entry, &permset) == -1)
4074 return -1;
4075
4076 num_entries++;
4077
4078 switch(tagtype) {
4079 case SMB_ACL_USER_OBJ:
4080 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4081 break;
4082 case SMB_ACL_GROUP_OBJ:
4083 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4084 break;
4085 case SMB_ACL_MASK:
4086 /*
4087 * FIXME: The ACL_MASK entry permissions should really be set to
4088 * the union of the permissions of all ACL_USER,
4089 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4090 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4091 */
4092 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4093 break;
4094 case SMB_ACL_OTHER:
4095 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4096 break;
4097 default:
4098 continue;
4099 }
4100
4101 if (map_acl_perms_to_permset(perms, &permset) == -1)
4102 return -1;
4103
4104 if (sys_acl_set_permset(entry, permset) == -1)
4105 return -1;
4106 }
4107
4108 /*
4109 * If this is a simple 3 element ACL or no elements then it's a standard
4110 * UNIX permission set. Just use chmod...
4111 */
4112
4113 if ((num_entries == 3) || (num_entries == 0))
4114 return -1;
4115
4116 return 0;
4117 }
4118
4119 /****************************************************************************
4120 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4121 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4122 resulting ACL on TO. Note that name is in UNIX character set.
4123 ****************************************************************************/
4124
4125 static int copy_access_posix_acl(connection_struct *conn,
4126 const struct smb_filename *smb_fname_from,
4127 const struct smb_filename *smb_fname_to,
4128 mode_t mode)
4129 {
4130 SMB_ACL_T posix_acl = NULL;
4131 int ret = -1;
4132
4133 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname_from,
4134 SMB_ACL_TYPE_ACCESS,
4135 talloc_tos())) == NULL)
4136 return -1;
4137
4138 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4139 goto done;
4140
4141 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname_to,
4142 SMB_ACL_TYPE_ACCESS, posix_acl);
4143
4144 done:
4145
4146 TALLOC_FREE(posix_acl);
4147 return ret;
4148 }
4149
4150 /****************************************************************************
4151 Check for an existing default POSIX ACL on a directory.
4152 ****************************************************************************/
4153
4154 static bool directory_has_default_posix_acl(connection_struct *conn,
4155 const struct smb_filename *smb_fname)
4156 {
4157 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4158 SMB_ACL_TYPE_DEFAULT,
4159 talloc_tos());
4160 bool has_acl = False;
4161 SMB_ACL_ENTRY_T entry;
4162
4163 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4164 has_acl = True;
4165 }
4166
4167 if (def_acl) {
4168 TALLOC_FREE(def_acl);
4169 }
4170 return has_acl;
4171 }
4172
4173 /****************************************************************************
4174 If the parent directory has no default ACL but it does have an Access ACL,
4175 inherit this Access ACL to file name.
4176 ****************************************************************************/
4177
4178 int inherit_access_posix_acl(connection_struct *conn,
4179 struct smb_filename *inherit_from_dir,
4180 const struct smb_filename *smb_fname,
4181 mode_t mode)
4182 {
4183 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4184 return 0;
4185
4186 return copy_access_posix_acl(conn, inherit_from_dir, smb_fname, mode);
4187 }
4188
4189 /****************************************************************************
4190 Map from wire type to permset.
4191 ****************************************************************************/
4192
4193 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4194 {
4195 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4196 return False;
4197 }
4198
4199 if (sys_acl_clear_perms(*p_permset) == -1) {
4200 return False;
4201 }
4202
4203 if (wire_perm & SMB_POSIX_ACL_READ) {
4204 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4205 return False;
4206 }
4207 }
4208 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4209 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4210 return False;
4211 }
4212 }
4213 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4214 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4215 return False;
4216 }
4217 }
4218 return True;
4219 }
4220
4221 /****************************************************************************
4222 Map from wire type to tagtype.
4223 ****************************************************************************/
4224
4225 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4226 {
4227 switch (wire_tt) {
4228 case SMB_POSIX_ACL_USER_OBJ:
4229 *p_tt = SMB_ACL_USER_OBJ;
4230 break;
4231 case SMB_POSIX_ACL_USER:
4232 *p_tt = SMB_ACL_USER;
4233 break;
4234 case SMB_POSIX_ACL_GROUP_OBJ:
4235 *p_tt = SMB_ACL_GROUP_OBJ;
4236 break;
4237 case SMB_POSIX_ACL_GROUP:
4238 *p_tt = SMB_ACL_GROUP;
4239 break;
4240 case SMB_POSIX_ACL_MASK:
4241 *p_tt = SMB_ACL_MASK;
4242 break;
4243 case SMB_POSIX_ACL_OTHER:
4244 *p_tt = SMB_ACL_OTHER;
4245 break;
4246 default:
4247 return False;
4248 }
4249 return True;
4250 }
4251
4252 /****************************************************************************
4253 Create a new POSIX acl from wire permissions.
4254 FIXME ! How does the share mask/mode fit into this.... ?
4255 ****************************************************************************/
4256
4257 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4258 uint16_t num_acls,
4259 const char *pdata,
4260 TALLOC_CTX *mem_ctx)
4261 {
4262 unsigned int i;
4263 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4264
4265 if (the_acl == NULL) {
4266 return NULL;
4267 }
4268
4269 for (i = 0; i < num_acls; i++) {
4270 SMB_ACL_ENTRY_T the_entry;
4271 SMB_ACL_PERMSET_T the_permset;
4272 SMB_ACL_TAG_T tag_type;
4273
4274 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4275 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4276 i, strerror(errno) ));
4277 goto fail;
4278 }
4279
4280 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4281 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4282 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4283 goto fail;
4284 }
4285
4286 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4287 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4288 i, strerror(errno) ));
4289 goto fail;
4290 }
4291
4292 /* Get the permset pointer from the new ACL entry. */
4293 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4294 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4295 i, strerror(errno) ));
4296 goto fail;
4297 }
4298
4299 /* Map from wire to permissions. */
4300 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4301 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4302 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4303 goto fail;
4304 }
4305
4306 /* Now apply to the new ACL entry. */
4307 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4308 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4309 i, strerror(errno) ));
4310 goto fail;
4311 }
4312
4313 if (tag_type == SMB_ACL_USER) {
4314 uint32_t uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4315 uid_t uid = (uid_t)uidval;
4316 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4317 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4318 (unsigned int)uid, i, strerror(errno) ));
4319 goto fail;
4320 }
4321 }
4322
4323 if (tag_type == SMB_ACL_GROUP) {
4324 uint32_t gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4325 gid_t gid = (uid_t)gidval;
4326 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4327 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4328 (unsigned int)gid, i, strerror(errno) ));
4329 goto fail;
4330 }
4331 }
4332 }
4333
4334 return the_acl;
4335
4336 fail:
4337
4338 if (the_acl != NULL) {
4339 TALLOC_FREE(the_acl);
4340 }
4341 return NULL;
4342 }
4343
4344 /****************************************************************************
4345 Calls from UNIX extensions - Default POSIX ACL set.
4346 If num_def_acls == 0 and not a directory just return. If it is a directory
4347 and num_def_acls == 0 then remove the default acl. Else set the default acl
4348 on the directory.
4349 ****************************************************************************/
4350
4351 NTSTATUS set_unix_posix_default_acl(connection_struct *conn,
4352 files_struct *fsp,
4353 uint16_t num_def_acls,
4354 const char *pdata)
4355 {
4356 SMB_ACL_T def_acl = NULL;
4357 NTSTATUS status;
4358 int ret;
4359
4360 if (!fsp->fsp_flags.is_directory) {
4361 return NT_STATUS_INVALID_HANDLE;
4362 }
4363
4364 if (!num_def_acls) {
4365 /* Remove the default ACL. */
4366 ret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
4367 if (ret == -1) {
4368 status = map_nt_error_from_unix(errno);
4369 DBG_INFO("acl_delete_def_file failed on "
4370 "directory %s (%s)\n",
4371 fsp_str_dbg(fsp),
4372 strerror(errno));
4373 return status;
4374 }
4375 return NT_STATUS_OK;
4376 }
4377
4378 def_acl = create_posix_acl_from_wire(conn,
4379 num_def_acls,
4380 pdata,
4381 talloc_tos());
4382 if (def_acl == NULL) {
4383 return map_nt_error_from_unix(errno);
4384 }
4385
4386 ret = SMB_VFS_SYS_ACL_SET_FILE(conn,
4387 fsp->fsp_name,
4388 SMB_ACL_TYPE_DEFAULT,
4389 def_acl);
4390 if (ret == -1) {
4391 status = map_nt_error_from_unix(errno);
4392 DBG_INFO("acl_set_file failed on directory %s (%s)\n",
4393 fsp_str_dbg(fsp),
4394 strerror(errno));
4395 TALLOC_FREE(def_acl);
4396 return status;
4397 }
4398
4399 DBG_DEBUG("set default acl for file %s\n",
4400 fsp_str_dbg(fsp));
4401 TALLOC_FREE(def_acl);
4402 return NT_STATUS_OK;
4403 }
4404
4405 /****************************************************************************
4406 Remove an ACL from a file. As we don't have acl_delete_entry() available
4407 we must read the current acl and copy all entries except MASK, USER and GROUP
4408 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4409 removed.
4410 FIXME ! How does the share mask/mode fit into this.... ?
4411 ****************************************************************************/
4412
4413 static NTSTATUS remove_posix_acl(connection_struct *conn,
4414 files_struct *fsp)
4415 {
4416 SMB_ACL_T file_acl = NULL;
4417 int entry_id = SMB_ACL_FIRST_ENTRY;
4418 SMB_ACL_ENTRY_T entry;
4419 /* Create a new ACL with only 3 entries, u/g/w. */
4420 SMB_ACL_T new_file_acl = NULL;
4421 SMB_ACL_ENTRY_T user_ent = NULL;
4422 SMB_ACL_ENTRY_T group_ent = NULL;
4423 SMB_ACL_ENTRY_T other_ent = NULL;
4424 NTSTATUS status;
4425 int ret;
4426
4427 new_file_acl = sys_acl_init(talloc_tos());
4428 if (new_file_acl == NULL) {
4429 status = map_nt_error_from_unix(errno);
4430 DBG_INFO("failed to init new ACL with 3 entries "
4431 "for file %s %s.\n",
4432 fsp_str_dbg(fsp),
4433 strerror(errno));
4434 goto done;
4435 }
4436
4437 /* Now create the u/g/w entries. */
4438 ret = sys_acl_create_entry(&new_file_acl, &user_ent);
4439 if (ret == -1) {
4440 status = map_nt_error_from_unix(errno);
4441 DBG_INFO("Failed to create user entry for file %s. (%s)\n",
4442 fsp_str_dbg(fsp),
4443 strerror(errno));
4444 goto done;
4445 }
4446 ret = sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ);
4447 if (ret == -1) {
4448 status = map_nt_error_from_unix(errno);
4449 DBG_INFO("Failed to set user entry for file %s. (%s)\n",
4450 fsp_str_dbg(fsp),
4451 strerror(errno));
4452 goto done;
4453 }
4454
4455 ret = sys_acl_create_entry(&new_file_acl, &group_ent);
4456 if (ret == -1) {
4457 status = map_nt_error_from_unix(errno);
4458 DBG_INFO("Failed to create group entry for file %s. (%s)\n",
4459 fsp_str_dbg(fsp),
4460 strerror(errno));
4461 goto done;
4462 }
4463 ret = sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ);
4464 if (ret == -1) {
4465 status = map_nt_error_from_unix(errno);
4466 DBG_INFO("Failed to set group entry for file %s. (%s)\n",
4467 fsp_str_dbg(fsp),
4468 strerror(errno));
4469 goto done;
4470 }
4471
4472 ret = sys_acl_create_entry(&new_file_acl, &other_ent);
4473 if (ret == -1) {
4474 status = map_nt_error_from_unix(errno);
4475 DBG_INFO("Failed to create other entry for file %s. (%s)\n",
4476 fsp_str_dbg(fsp),
4477 strerror(errno));
4478 goto done;
4479 }
4480 ret = sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER);
4481 if (ret == -1) {
4482 status = map_nt_error_from_unix(errno);
4483 DBG_INFO("Failed to set other entry for file %s. (%s)\n",
4484 fsp_str_dbg(fsp),
4485 strerror(errno));
4486 goto done;
4487 }
4488
4489 /* Get the current file ACL. */
4490 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4491
4492 if (file_acl == NULL) {
4493 status = map_nt_error_from_unix(errno);
4494 /* This is only returned if an error occurred. Even for a file with
4495 no acl a u/g/w acl should be returned. */
4496 DBG_INFO("failed to get ACL from file %s (%s).\n",
4497 fsp_str_dbg(fsp),
4498 strerror(errno));
4499 goto done;
4500 }
4501
4502 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4503 SMB_ACL_TAG_T tagtype;
4504 SMB_ACL_PERMSET_T permset;
4505
4506 entry_id = SMB_ACL_NEXT_ENTRY;
4507
4508 ret = sys_acl_get_tag_type(entry, &tagtype);
4509 if (ret == -1) {
4510 status = map_nt_error_from_unix(errno);
4511 DBG_INFO("failed to get tagtype from ACL "
4512 "on file %s (%s).\n",
4513 fsp_str_dbg(fsp),
4514 strerror(errno));
4515 goto done;
4516 }
4517
4518 ret = sys_acl_get_permset(entry, &permset);
4519 if (ret == -1) {
4520 status = map_nt_error_from_unix(errno);
4521 DBG_INFO("failed to get permset from ACL "
4522 "on file %s (%s).\n",
4523 fsp_str_dbg(fsp),
4524 strerror(errno));
4525 goto done;
4526 }
4527
4528 if (tagtype == SMB_ACL_USER_OBJ) {
4529 ret = sys_acl_set_permset(user_ent, permset);
4530 if (ret == -1) {
4531 status = map_nt_error_from_unix(errno);
4532 DBG_INFO("failed to set permset from ACL "
4533 "on file %s (%s).\n",
4534 fsp_str_dbg(fsp),
4535 strerror(errno));
4536 goto done;
4537 }
4538 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4539 ret = sys_acl_set_permset(group_ent, permset);
4540 if (ret == -1) {
4541 status = map_nt_error_from_unix(errno);
4542 DBG_INFO("failed to set permset from ACL "
4543 "on file %s (%s).\n",
4544 fsp_str_dbg(fsp),
4545 strerror(errno));
4546 goto done;
4547 }
4548 } else if (tagtype == SMB_ACL_OTHER) {
4549 ret = sys_acl_set_permset(other_ent, permset);
4550 if (ret == -1) {
4551 status = map_nt_error_from_unix(errno);
4552 DBG_INFO("failed to set permset from ACL "
4553 "on file %s (%s).\n",
4554 fsp_str_dbg(fsp),
4555 strerror(errno));
4556 goto done;
4557 }
4558 }
4559 }
4560
4561 /* Set the new empty file ACL. */
4562 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl);
4563 if (ret == -1) {
4564 status = map_nt_error_from_unix(errno);
4565 DBG_INFO("acl_set_file failed on %s (%s)\n",
4566 fsp_str_dbg(fsp),
4567 strerror(errno));
4568 goto done;
4569 }
4570
4571 status = NT_STATUS_OK;
4572
4573 done:
4574
4575 TALLOC_FREE(file_acl);
4576 TALLOC_FREE(new_file_acl);
4577 return status;
4578 }
4579
4580 /****************************************************************************
4581 Calls from UNIX extensions - POSIX ACL set.
4582 If num_def_acls == 0 then read/modify/write acl after removing all entries
4583 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4584 ****************************************************************************/
4585
4586 NTSTATUS set_unix_posix_acl(connection_struct *conn,
4587 files_struct *fsp,
4588 uint16_t num_acls,
4589 const char *pdata)
4590 {
4591 SMB_ACL_T file_acl = NULL;
4592 int ret;
4593 NTSTATUS status;
4594
4595 if (!num_acls) {
4596 /* Remove the ACL from the file. */
4597 return remove_posix_acl(conn, fsp);
4598 }
4599
4600 file_acl = create_posix_acl_from_wire(conn,
4601 num_acls,
4602 pdata,
4603 talloc_tos());
4604 if (file_acl == NULL) {
4605 return map_nt_error_from_unix(errno);
4606 }
4607
4608 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl);
4609 if (ret == -1) {
4610 status = map_nt_error_from_unix(errno);
4611 DBG_INFO("acl_set_file failed on %s (%s)\n",
4612 fsp_str_dbg(fsp),
4613 strerror(errno));
4614 TALLOC_FREE(file_acl);
4615 return status;
4616 }
4617
4618 DBG_DEBUG("set acl for file %s\n",
4619 fsp_str_dbg(fsp));
4620
4621 TALLOC_FREE(file_acl);
4622 return NT_STATUS_OK;
4623 }
4624
4625 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4626 const struct smb_filename *smb_fname_in,
4627 TALLOC_CTX *mem_ctx,
4628 char **blob_description,
4629 DATA_BLOB *blob)
4630 {
4631 int ret;
4632 TALLOC_CTX *frame = talloc_stackframe();
4633 /* Initialise this to zero, in a portable way */
4634 struct smb_acl_wrapper acl_wrapper = {
4635 0
4636 };
4637 struct smb_filename *smb_fname = cp_smb_filename_nostream(frame,
4638 smb_fname_in);
4639 if (smb_fname == NULL) {
4640 TALLOC_FREE(frame);
4641 errno = ENOMEM;
4642 return -1;
4643 }
4644
4645 acl_wrapper.access_acl
4646 = smb_vfs_call_sys_acl_get_file(handle,
4647 smb_fname,
4648 SMB_ACL_TYPE_ACCESS,
4649 frame);
4650
4651 ret = smb_vfs_call_stat(handle, smb_fname);
4652 if (ret == -1) {
4653 TALLOC_FREE(frame);
4654 return -1;
4655 }
4656
4657 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4658 acl_wrapper.default_acl
4659 = smb_vfs_call_sys_acl_get_file(handle,
4660 smb_fname,
4661 SMB_ACL_TYPE_DEFAULT,
4662 frame);
4663 }
4664
4665 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4666 acl_wrapper.group = smb_fname->st.st_ex_gid;
4667 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4668
4669 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4670 &acl_wrapper,
4671 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4672 errno = EINVAL;
4673 TALLOC_FREE(frame);
4674 return -1;
4675 }
4676
4677 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4678 if (!*blob_description) {
4679 errno = EINVAL;
4680 TALLOC_FREE(frame);
4681 return -1;
4682 }
4683
4684 TALLOC_FREE(frame);
4685 return 0;
4686 }
4687
4688 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4689 files_struct *fsp,
4690 TALLOC_CTX *mem_ctx,
4691 char **blob_description,
4692 DATA_BLOB *blob)
4693 {
4694 SMB_STRUCT_STAT sbuf;
4695 TALLOC_CTX *frame;
4696 struct smb_acl_wrapper acl_wrapper;
4697 int ret;
4698
4699 /* This ensures that we also consider the default ACL */
4700 if (fsp->fsp_flags.is_directory || fsp->fh->fd == -1) {
4701 return posix_sys_acl_blob_get_file(handle,
4702 fsp->fsp_name,
4703 mem_ctx,
4704 blob_description,
4705 blob);
4706 }
4707 frame = talloc_stackframe();
4708
4709 acl_wrapper.default_acl = NULL;
4710
4711 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle,
4712 fsp->fsp_name,
4713 SMB_ACL_TYPE_ACCESS,
4714 frame);
4715
4716 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4717 if (ret == -1) {
4718 TALLOC_FREE(frame);
4719 return -1;
4720 }
4721
4722 acl_wrapper.owner = sbuf.st_ex_uid;
4723 acl_wrapper.group = sbuf.st_ex_gid;
4724 acl_wrapper.mode = sbuf.st_ex_mode;
4725
4726 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4727 &acl_wrapper,
4728 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4729 errno = EINVAL;
4730 TALLOC_FREE(frame);
4731 return -1;
4732 }
4733
4734 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4735 if (!*blob_description) {
4736 errno = EINVAL;
4737 TALLOC_FREE(frame);
4738 return -1;
4739 }
4740
4741 TALLOC_FREE(frame);
4742 return 0;
4743 }
4744
4745 static NTSTATUS make_default_acl_posix(TALLOC_CTX *ctx,
4746 const char *name,
4747 const SMB_STRUCT_STAT *psbuf,
4748 struct security_descriptor **ppdesc)
4749 {
4750 struct dom_sid owner_sid, group_sid;
4751 size_t size = 0;
4752 struct security_ace aces[4];
4753 uint32_t access_mask = 0;
4754 mode_t mode = psbuf->st_ex_mode;
4755 struct security_acl *new_dacl = NULL;
4756 int idx = 0;
4757
4758 DBG_DEBUG("file %s mode = 0%o\n",name, (int)mode);
4759
4760 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4761 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4762
4763 /*
4764 We provide up to 4 ACEs
4765 - Owner
4766 - Group
4767 - Everyone
4768 - NT System
4769 */
4770
4771 if (mode & S_IRUSR) {
4772 if (mode & S_IWUSR) {
4773 access_mask |= SEC_RIGHTS_FILE_ALL;
4774 } else {
4775 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4776 }
4777 }
4778 if (mode & S_IWUSR) {
4779 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4780 }
4781
4782 init_sec_ace(&aces[idx],
4783 &owner_sid,
4784 SEC_ACE_TYPE_ACCESS_ALLOWED,
4785 access_mask,
4786 0);
4787 idx++;
4788
4789 access_mask = 0;
4790 if (mode & S_IRGRP) {
4791 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4792 }
4793 if (mode & S_IWGRP) {
4794 /* note that delete is not granted - this matches posix behaviour */
4795 access_mask |= SEC_RIGHTS_FILE_WRITE;
4796 }
4797 if (access_mask) {
4798 init_sec_ace(&aces[idx],
4799 &group_sid,
4800 SEC_ACE_TYPE_ACCESS_ALLOWED,
4801 access_mask,
4802 0);
4803 idx++;
4804 }
4805
4806 access_mask = 0;
4807 if (mode & S_IROTH) {
4808 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4809 }
4810 if (mode & S_IWOTH) {
4811 access_mask |= SEC_RIGHTS_FILE_WRITE;
4812 }
4813 if (access_mask) {
4814 init_sec_ace(&aces[idx],
4815 &global_sid_World,
4816 SEC_ACE_TYPE_ACCESS_ALLOWED,
4817 access_mask,
4818 0);
4819 idx++;
4820 }
4821
4822 init_sec_ace(&aces[idx],
4823 &global_sid_System,
4824 SEC_ACE_TYPE_ACCESS_ALLOWED,
4825 SEC_RIGHTS_FILE_ALL,
4826 0);
4827 idx++;
4828
4829 new_dacl = make_sec_acl(ctx,
4830 NT4_ACL_REVISION,
4831 idx,
4832 aces);
4833
4834 if (!new_dacl) {
4835 return NT_STATUS_NO_MEMORY;
4836 }
4837
4838 *ppdesc = make_sec_desc(ctx,
4839 SECURITY_DESCRIPTOR_REVISION_1,
4840 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4841 &owner_sid,
4842 &group_sid,
4843 NULL,
4844 new_dacl,
4845 &size);
4846 if (!*ppdesc) {
4847 return NT_STATUS_NO_MEMORY;
4848 }
4849 return NT_STATUS_OK;
4850 }
4851
4852 static NTSTATUS make_default_acl_windows(TALLOC_CTX *ctx,
4853 const char *name,
4854 const SMB_STRUCT_STAT *psbuf,
4855 struct security_descriptor **ppdesc)
4856 {
4857 struct dom_sid owner_sid, group_sid;
4858 size_t size = 0;
4859 struct security_ace aces[4];
4860 uint32_t access_mask = 0;
4861 mode_t mode = psbuf->st_ex_mode;
4862 struct security_acl *new_dacl = NULL;
4863 int idx = 0;
4864
4865 DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
4866
4867 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4868 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4869
4870 /*
4871 * We provide 2 ACEs:
4872 * - Owner
4873 * - NT System
4874 */
4875
4876 if (mode & S_IRUSR) {
4877 if (mode & S_IWUSR) {
4878 access_mask |= SEC_RIGHTS_FILE_ALL;
4879 } else {
4880 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4881 }
4882 }
4883 if (mode & S_IWUSR) {
4884 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4885 }
4886
4887 init_sec_ace(&aces[idx],
4888 &owner_sid,
4889 SEC_ACE_TYPE_ACCESS_ALLOWED,
4890 access_mask,
4891 0);
4892 idx++;
4893
4894 init_sec_ace(&aces[idx],
4895 &global_sid_System,
4896 SEC_ACE_TYPE_ACCESS_ALLOWED,
4897 SEC_RIGHTS_FILE_ALL,
4898 0);
4899 idx++;
4900
4901 new_dacl = make_sec_acl(ctx,
4902 NT4_ACL_REVISION,
4903 idx,
4904 aces);
4905
4906 if (!new_dacl) {
4907 return NT_STATUS_NO_MEMORY;
4908 }
4909
4910 *ppdesc = make_sec_desc(ctx,
4911 SECURITY_DESCRIPTOR_REVISION_1,
4912 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4913 &owner_sid,
4914 &group_sid,
4915 NULL,
4916 new_dacl,
4917 &size);
4918 if (!*ppdesc) {
4919 return NT_STATUS_NO_MEMORY;
4920 }
4921 return NT_STATUS_OK;
4922 }
4923
4924 static NTSTATUS make_default_acl_everyone(TALLOC_CTX *ctx,
4925 const char *name,
4926 const SMB_STRUCT_STAT *psbuf,
4927 struct security_descriptor **ppdesc)
4928 {
4929 struct dom_sid owner_sid, group_sid;
4930 size_t size = 0;
4931 struct security_ace aces[1];
4932 mode_t mode = psbuf->st_ex_mode;
4933 struct security_acl *new_dacl = NULL;
4934 int idx = 0;
4935
4936 DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
4937
4938 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4939 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4940
4941 /*
4942 * We provide one ACEs: full access for everyone
4943 */
4944
4945 init_sec_ace(&aces[idx],
4946 &global_sid_World,
4947 SEC_ACE_TYPE_ACCESS_ALLOWED,
4948 SEC_RIGHTS_FILE_ALL,
4949 0);
4950 idx++;
4951
4952 new_dacl = make_sec_acl(ctx,
4953 NT4_ACL_REVISION,
4954 idx,
4955 aces);
4956
4957 if (!new_dacl) {
4958 return NT_STATUS_NO_MEMORY;
4959 }
4960
4961 *ppdesc = make_sec_desc(ctx,
4962 SECURITY_DESCRIPTOR_REVISION_1,
4963 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4964 &owner_sid,
4965 &group_sid,
4966 NULL,
4967 new_dacl,
4968 &size);
4969 if (!*ppdesc) {
4970 return NT_STATUS_NO_MEMORY;
4971 }
4972 return NT_STATUS_OK;
4973 }
4974
4975 static const struct enum_list default_acl_style_list[] = {
4976 {DEFAULT_ACL_POSIX, "posix"},
4977 {DEFAULT_ACL_WINDOWS, "windows"},
4978 {DEFAULT_ACL_EVERYONE, "everyone"},
4979 };
4980
4981 const struct enum_list *get_default_acl_style_list(void)
4982 {
4983 return default_acl_style_list;
4984 }
4985
4986 NTSTATUS make_default_filesystem_acl(
4987 TALLOC_CTX *ctx,
4988 enum default_acl_style acl_style,
4989 const char *name,
4990 const SMB_STRUCT_STAT *psbuf,
4991 struct security_descriptor **ppdesc)
4992 {
4993 NTSTATUS status;
4994
4995 switch (acl_style) {
4996 case DEFAULT_ACL_POSIX:
4997 status = make_default_acl_posix(ctx, name, psbuf, ppdesc);
4998 break;
4999
5000 case DEFAULT_ACL_WINDOWS:
5001 status = make_default_acl_windows(ctx, name, psbuf, ppdesc);
5002 break;
5003
5004 case DEFAULT_ACL_EVERYONE:
5005 status = make_default_acl_everyone(ctx, name, psbuf, ppdesc);
5006 break;
5007
5008 default:
5009 DBG_ERR("unknown acl style %d", acl_style);
5010 status = NT_STATUS_INTERNAL_ERROR;
5011 break;
5012 }
5013
5014 return status;
5015 }
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