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auth4: avoid map_user_info() in auth_check_password_send()
[Samba.git] / source3 / smbd / posix_acls.c
blob72bb9fe086ee91e5c5cb7b51f195908d486f9bbc
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->base_name,
279 SAMBA_POSIX_INHERITANCE_EA_NAME,
280 pai_buf, store_size, 0);
281 }
282
283 TALLOC_FREE(pai_buf);
284
285 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
286 (unsigned int)sd_type,
287 fsp_str_dbg(fsp)));
288
289 if (ret == -1 && !no_acl_syscall_error(errno)) {
290 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
291 }
292 }
293
294 /************************************************************************
295 Delete the in memory inheritance info.
296 ************************************************************************/
297
298 static void free_inherited_info(struct pai_val *pal)
299 {
300 if (pal) {
301 struct pai_entry *paie, *paie_next;
302 for (paie = pal->entry_list; paie; paie = paie_next) {
303 paie_next = paie->next;
304 TALLOC_FREE(paie);
305 }
306 for (paie = pal->def_entry_list; paie; paie = paie_next) {
307 paie_next = paie->next;
308 TALLOC_FREE(paie);
309 }
310 TALLOC_FREE(pal);
311 }
312 }
313
314 /************************************************************************
315 Get any stored ACE flags.
316 ************************************************************************/
317
318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
319 {
320 struct pai_entry *paie;
321
322 if (!pal) {
323 return 0;
324 }
325
326 /* If the entry exists it is inherited. */
327 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
328 if (ace_entry->owner_type == paie->owner_type &&
329 get_entry_val(ace_entry) == get_pai_entry_val(paie))
330 return paie->ace_flags;
331 }
332 return 0;
333 }
334
335 /************************************************************************
336 Ensure an attribute just read is valid - v1.
337 ************************************************************************/
338
339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
340 {
341 uint16_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->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 dbgtext( "uid %u ", (unsigned int)pace->unix_ug.id);
806 } else if (pace->owner_type == GID_ACE) {
807 dbgtext( "gid %u ", (unsigned int)pace->unix_ug.id);
808 } else
809 dbgtext( "other ");
810 switch (pace->type) {
811 case SMB_ACL_USER:
812 dbgtext( "SMB_ACL_USER ");
813 break;
814 case SMB_ACL_USER_OBJ:
815 dbgtext( "SMB_ACL_USER_OBJ ");
816 break;
817 case SMB_ACL_GROUP:
818 dbgtext( "SMB_ACL_GROUP ");
819 break;
820 case SMB_ACL_GROUP_OBJ:
821 dbgtext( "SMB_ACL_GROUP_OBJ ");
822 break;
823 case SMB_ACL_OTHER:
824 dbgtext( "SMB_ACL_OTHER ");
825 break;
826 default:
827 dbgtext( "MASK " );
828 break;
829 }
830
831 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
832 dbgtext( "perms ");
833 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
834 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
835 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
836 }
837
838 /****************************************************************************
839 Print out a canon ace list.
840 ****************************************************************************/
841
842 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
843 {
844 int count = 0;
845
846 if( DEBUGLVL( 10 )) {
847 dbgtext( "print_canon_ace_list: %s\n", name );
848 for (;ace_list; ace_list = ace_list->next, count++)
849 print_canon_ace(ace_list, count );
850 }
851 }
852
853 /****************************************************************************
854 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
855 ****************************************************************************/
856
857 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
858 {
859 mode_t ret = 0;
860
861 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
862 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
863 ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
864
865 return ret;
866 }
867
868 /****************************************************************************
869 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
870 ****************************************************************************/
871
872 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
873 {
874 mode_t ret = 0;
875
876 if (mode & r_mask)
877 ret |= S_IRUSR;
878 if (mode & w_mask)
879 ret |= S_IWUSR;
880 if (mode & x_mask)
881 ret |= S_IXUSR;
882
883 return ret;
884 }
885
886 /****************************************************************************
887 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
888 an SMB_ACL_PERMSET_T.
889 ****************************************************************************/
890
891 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
892 {
893 if (sys_acl_clear_perms(*p_permset) == -1)
894 return -1;
895 if (mode & S_IRUSR) {
896 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
897 return -1;
898 }
899 if (mode & S_IWUSR) {
900 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
901 return -1;
902 }
903 if (mode & S_IXUSR) {
904 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
905 return -1;
906 }
907 return 0;
908 }
909
910 /****************************************************************************
911 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
912 ****************************************************************************/
913
914 static void create_file_sids(const SMB_STRUCT_STAT *psbuf,
915 struct dom_sid *powner_sid,
916 struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same.
953 *
954 * For the IDMAP_BOTH case, we must not merge
955 * the UID and GID ACE values for same SID
956 */
957
958 if (!dir_acl) {
959 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
960 curr_ace->owner_type == curr_ace_outer->owner_type &&
961 (curr_ace->attr == curr_ace_outer->attr));
962 } else {
963 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
964 curr_ace->owner_type == curr_ace_outer->owner_type &&
965 (curr_ace->type == curr_ace_outer->type) &&
966 (curr_ace->attr == curr_ace_outer->attr));
967 }
968
969 if (can_merge) {
970 if( DEBUGLVL( 10 )) {
971 dbgtext("merge_aces: Merging ACE's\n");
972 print_canon_ace( curr_ace_outer, 0);
973 print_canon_ace( curr_ace, 0);
974 }
975
976 /* Merge two allow or two deny ACE's. */
977
978 /* Theoretically we shouldn't merge a dir ACE if
979 * one ACE has the CI flag set, and the other
980 * ACE has the OI flag set, but this is rare
981 * enough we can ignore it. */
982
983 curr_ace_outer->perms |= curr_ace->perms;
984 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
985 DLIST_REMOVE(l_head, curr_ace);
986 TALLOC_FREE(curr_ace);
987 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
988 }
989 }
990 }
991
992 /*
993 * Now go through and mask off allow permissions with deny permissions.
994 * We can delete either the allow or deny here as we know that each SID
995 * appears only once in the list.
996 */
997
998 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
999 canon_ace *curr_ace;
1000 canon_ace *curr_ace_next;
1001
1002 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1003
1004 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1005
1006 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1007
1008 /*
1009 * Subtract ACE's with different entries. Due to the ordering constraints
1010 * we've put on the ACL, we know the deny must be the first one.
1011 */
1012
1013 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1014 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1015 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1016
1017 if( DEBUGLVL( 10 )) {
1018 dbgtext("merge_aces: Masking ACE's\n");
1019 print_canon_ace( curr_ace_outer, 0);
1020 print_canon_ace( curr_ace, 0);
1021 }
1022
1023 curr_ace->perms &= ~curr_ace_outer->perms;
1024
1025 if (curr_ace->perms == 0) {
1026
1027 /*
1028 * The deny overrides the allow. Remove the allow.
1029 */
1030
1031 DLIST_REMOVE(l_head, curr_ace);
1032 TALLOC_FREE(curr_ace);
1033 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1034
1035 } else {
1036
1037 /*
1038 * Even after removing permissions, there
1039 * are still allow permissions - delete the deny.
1040 * It is safe to delete the deny here,
1041 * as we are guarenteed by the deny first
1042 * ordering that all the deny entries for
1043 * this SID have already been merged into one
1044 * before we can get to an allow ace.
1045 */
1046
1047 DLIST_REMOVE(l_head, curr_ace_outer);
1048 TALLOC_FREE(curr_ace_outer);
1049 break;
1050 }
1051 }
1052
1053 } /* end for curr_ace */
1054 } /* end for curr_ace_outer */
1055
1056 /* We may have modified the list. */
1057
1058 *pp_list_head = l_head;
1059 }
1060
1061 /****************************************************************************
1062 Map canon_ace perms to permission bits NT.
1063 The attr element is not used here - we only process deny entries on set,
1064 not get. Deny entries are implicit on get with ace->perms = 0.
1065 ****************************************************************************/
1066
1067 uint32_t map_canon_ace_perms(int snum,
1068 enum security_ace_type *pacl_type,
1069 mode_t perms,
1070 bool directory_ace)
1071 {
1072 uint32_t nt_mask = 0;
1073
1074 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1075
1076 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1077 if (directory_ace) {
1078 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1079 } else {
1080 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1081 }
1082 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1083 /*
1084 * Windows NT refuses to display ACEs with no permissions in them (but
1085 * they are perfectly legal with Windows 2000). If the ACE has empty
1086 * permissions we cannot use 0, so we use the otherwise unused
1087 * WRITE_OWNER permission, which we ignore when we set an ACL.
1088 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1089 * to be changed in the future.
1090 */
1091
1092 nt_mask = 0;
1093 } else {
1094 if (directory_ace) {
1095 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1096 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1097 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1098 } else {
1099 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1100 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1101 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1102 }
1103 }
1104
1105 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1106 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1107 }
1108
1109 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1110 (unsigned int)perms, (unsigned int)nt_mask ));
1111
1112 return nt_mask;
1113 }
1114
1115 /****************************************************************************
1116 Map NT perms to a UNIX mode_t.
1117 ****************************************************************************/
1118
1119 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1120 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1121 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1122
1123 static mode_t map_nt_perms( uint32_t *mask, int type)
1124 {
1125 mode_t mode = 0;
1126
1127 switch(type) {
1128 case S_IRUSR:
1129 if((*mask) & GENERIC_ALL_ACCESS)
1130 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1131 else {
1132 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1133 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1134 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1135 }
1136 break;
1137 case S_IRGRP:
1138 if((*mask) & GENERIC_ALL_ACCESS)
1139 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1140 else {
1141 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1142 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1143 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1144 }
1145 break;
1146 case S_IROTH:
1147 if((*mask) & GENERIC_ALL_ACCESS)
1148 mode = S_IROTH|S_IWOTH|S_IXOTH;
1149 else {
1150 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1151 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1152 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1153 }
1154 break;
1155 }
1156
1157 return mode;
1158 }
1159
1160 /****************************************************************************
1161 Unpack a struct security_descriptor into a UNIX owner and group.
1162 ****************************************************************************/
1163
1164 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1165 uid_t *puser, gid_t *pgrp,
1166 uint32_t security_info_sent, const struct
1167 security_descriptor *psd)
1168 {
1169 *puser = (uid_t)-1;
1170 *pgrp = (gid_t)-1;
1171
1172 if(security_info_sent == 0) {
1173 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1174 return NT_STATUS_OK;
1175 }
1176
1177 /*
1178 * Validate the owner and group SID's.
1179 */
1180
1181 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1182
1183 /*
1184 * Don't immediately fail if the owner sid cannot be validated.
1185 * This may be a group chown only set.
1186 */
1187
1188 if (security_info_sent & SECINFO_OWNER) {
1189 if (!sid_to_uid(psd->owner_sid, puser)) {
1190 if (lp_force_unknown_acl_user(SNUM(conn))) {
1191 /* this allows take ownership to work
1192 * reasonably */
1193 *puser = get_current_uid(conn);
1194 } else {
1195 DEBUG(3,("unpack_nt_owners: unable to validate"
1196 " owner sid for %s\n",
1197 sid_string_dbg(psd->owner_sid)));
1198 return NT_STATUS_INVALID_OWNER;
1199 }
1200 }
1201 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1202 (unsigned int)*puser ));
1203 }
1204
1205 /*
1206 * Don't immediately fail if the group sid cannot be validated.
1207 * This may be an owner chown only set.
1208 */
1209
1210 if (security_info_sent & SECINFO_GROUP) {
1211 if (!sid_to_gid(psd->group_sid, pgrp)) {
1212 if (lp_force_unknown_acl_user(SNUM(conn))) {
1213 /* this allows take group ownership to work
1214 * reasonably */
1215 *pgrp = get_current_gid(conn);
1216 } else {
1217 DEBUG(3,("unpack_nt_owners: unable to validate"
1218 " group sid.\n"));
1219 return NT_STATUS_INVALID_OWNER;
1220 }
1221 }
1222 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1223 (unsigned int)*pgrp));
1224 }
1225
1226 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1227
1228 return NT_STATUS_OK;
1229 }
1230
1231
1232 static void trim_ace_perms(canon_ace *pace)
1233 {
1234 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1235 }
1236
1237 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1238 canon_ace *pace)
1239 {
1240 pace->perms |= S_IRUSR;
1241 if (is_directory) {
1242 pace->perms |= (S_IWUSR|S_IXUSR);
1243 }
1244 }
1245
1246 /****************************************************************************
1247 Check if a given uid/SID is in a group gid/SID. This is probably very
1248 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1249 ****************************************************************************/
1250
1251 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1252 {
1253 /* "Everyone" always matches every uid. */
1254
1255 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1256 return True;
1257
1258 /*
1259 * if it's the current user, we already have the unix token
1260 * and don't need to do the complex user_in_group_sid() call
1261 */
1262 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1263 const struct security_unix_token *curr_utok = NULL;
1264 size_t i;
1265
1266 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1267 return True;
1268 }
1269
1270 curr_utok = get_current_utok(conn);
1271 for (i=0; i < curr_utok->ngroups; i++) {
1272 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1273 return True;
1274 }
1275 }
1276 }
1277
1278 /*
1279 * user_in_group_sid() uses create_token_from_sid()
1280 * which creates an artificial NT token given just a username,
1281 * so this is not reliable for users from foreign domains
1282 * exported by winbindd!
1283 */
1284 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1285 }
1286
1287 /****************************************************************************
1288 A well formed POSIX file or default ACL has at least 3 entries, a
1289 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1290 In addition, the owner must always have at least read access.
1291 When using this call on get_acl, the pst struct is valid and contains
1292 the mode of the file.
1293 ****************************************************************************/
1294
1295 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1296 canon_ace **pp_ace,
1297 const struct dom_sid *pfile_owner_sid,
1298 const struct dom_sid *pfile_grp_sid,
1299 const SMB_STRUCT_STAT *pst)
1300 {
1301 canon_ace *pace;
1302 bool got_user = false;
1303 bool got_group = false;
1304 bool got_other = false;
1305
1306 for (pace = *pp_ace; pace; pace = pace->next) {
1307 if (pace->type == SMB_ACL_USER_OBJ) {
1308 got_user = true;
1309 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1310 got_group = true;
1311 } else if (pace->type == SMB_ACL_OTHER) {
1312 got_other = true;
1313 }
1314 }
1315
1316 if (!got_user) {
1317 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1318 DEBUG(0,("malloc fail.\n"));
1319 return false;
1320 }
1321
1322 ZERO_STRUCTP(pace);
1323 pace->type = SMB_ACL_USER_OBJ;
1324 pace->owner_type = UID_ACE;
1325 pace->unix_ug.type = ID_TYPE_UID;
1326 pace->unix_ug.id = pst->st_ex_uid;
1327 pace->trustee = *pfile_owner_sid;
1328 pace->attr = ALLOW_ACE;
1329 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1330 DLIST_ADD(*pp_ace, pace);
1331 }
1332
1333 if (!got_group) {
1334 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1335 DEBUG(0,("malloc fail.\n"));
1336 return false;
1337 }
1338
1339 ZERO_STRUCTP(pace);
1340 pace->type = SMB_ACL_GROUP_OBJ;
1341 pace->owner_type = GID_ACE;
1342 pace->unix_ug.type = ID_TYPE_GID;
1343 pace->unix_ug.id = pst->st_ex_gid;
1344 pace->trustee = *pfile_grp_sid;
1345 pace->attr = ALLOW_ACE;
1346 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1347 DLIST_ADD(*pp_ace, pace);
1348 }
1349
1350 if (!got_other) {
1351 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1352 DEBUG(0,("malloc fail.\n"));
1353 return false;
1354 }
1355
1356 ZERO_STRUCTP(pace);
1357 pace->type = SMB_ACL_OTHER;
1358 pace->owner_type = WORLD_ACE;
1359 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1360 pace->unix_ug.id = -1;
1361 pace->trustee = global_sid_World;
1362 pace->attr = ALLOW_ACE;
1363 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1364 DLIST_ADD(*pp_ace, pace);
1365 }
1366
1367 return true;
1368 }
1369
1370 /****************************************************************************
1371 A well formed POSIX file or default ACL has at least 3 entries, a
1372 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1373 In addition, the owner must always have at least read access.
1374 When using this call on set_acl, the pst struct has
1375 been modified to have a mode containing the default for this file or directory
1376 type.
1377 ****************************************************************************/
1378
1379 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1380 canon_ace **pp_ace,
1381 bool is_default_acl,
1382 const struct share_params *params,
1383 const bool is_directory,
1384 const struct dom_sid *pfile_owner_sid,
1385 const struct dom_sid *pfile_grp_sid,
1386 const SMB_STRUCT_STAT *pst)
1387 {
1388 canon_ace *pace;
1389 canon_ace *pace_user = NULL;
1390 canon_ace *pace_group = NULL;
1391 canon_ace *pace_other = NULL;
1392 bool got_duplicate_user = false;
1393 bool got_duplicate_group = false;
1394
1395 for (pace = *pp_ace; pace; pace = pace->next) {
1396 trim_ace_perms(pace);
1397 if (pace->type == SMB_ACL_USER_OBJ) {
1398 ensure_minimal_owner_ace_perms(is_directory, pace);
1399 pace_user = pace;
1400 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1401 pace_group = pace;
1402 } else if (pace->type == SMB_ACL_OTHER) {
1403 pace_other = pace;
1404 }
1405 }
1406
1407 if (!pace_user) {
1408 canon_ace *pace_iter;
1409
1410 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1411 DEBUG(0,("talloc fail.\n"));
1412 return false;
1413 }
1414
1415 ZERO_STRUCTP(pace);
1416 pace->type = SMB_ACL_USER_OBJ;
1417 pace->owner_type = UID_ACE;
1418 pace->unix_ug.type = ID_TYPE_UID;
1419 pace->unix_ug.id = pst->st_ex_uid;
1420 pace->trustee = *pfile_owner_sid;
1421 pace->attr = ALLOW_ACE;
1422 /* Start with existing user permissions, principle of least
1423 surprises for the user. */
1424 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1425
1426 /* See if the owning user is in any of the other groups in
1427 the ACE, or if there's a matching user entry (by uid
1428 or in the case of ID_TYPE_BOTH by SID).
1429 If so, OR in the permissions from that entry. */
1430
1431
1432 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1433 if (pace_iter->type == SMB_ACL_USER &&
1434 pace_iter->unix_ug.id == pace->unix_ug.id) {
1435 pace->perms |= pace_iter->perms;
1436 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1437 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1438 pace->perms |= pace_iter->perms;
1439 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1440 pace->perms |= pace_iter->perms;
1441 }
1442 }
1443 }
1444
1445 if (pace->perms == 0) {
1446 /* If we only got an "everyone" perm, just use that. */
1447 if (pace_other)
1448 pace->perms = pace_other->perms;
1449 }
1450
1451 /*
1452 * Ensure we have default parameters for the
1453 * user (owner) even on default ACLs.
1454 */
1455 ensure_minimal_owner_ace_perms(is_directory, pace);
1456
1457 DLIST_ADD(*pp_ace, pace);
1458 pace_user = pace;
1459 }
1460
1461 if (!pace_group) {
1462 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1463 DEBUG(0,("talloc fail.\n"));
1464 return false;
1465 }
1466
1467 ZERO_STRUCTP(pace);
1468 pace->type = SMB_ACL_GROUP_OBJ;
1469 pace->owner_type = GID_ACE;
1470 pace->unix_ug.type = ID_TYPE_GID;
1471 pace->unix_ug.id = pst->st_ex_gid;
1472 pace->trustee = *pfile_grp_sid;
1473 pace->attr = ALLOW_ACE;
1474
1475 /* If we only got an "everyone" perm, just use that. */
1476 if (pace_other) {
1477 pace->perms = pace_other->perms;
1478 } else {
1479 pace->perms = 0;
1480 }
1481
1482 DLIST_ADD(*pp_ace, pace);
1483 pace_group = pace;
1484 }
1485
1486 if (!pace_other) {
1487 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1488 DEBUG(0,("talloc fail.\n"));
1489 return false;
1490 }
1491
1492 ZERO_STRUCTP(pace);
1493 pace->type = SMB_ACL_OTHER;
1494 pace->owner_type = WORLD_ACE;
1495 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1496 pace->unix_ug.id = -1;
1497 pace->trustee = global_sid_World;
1498 pace->attr = ALLOW_ACE;
1499 pace->perms = 0;
1500
1501 DLIST_ADD(*pp_ace, pace);
1502 pace_other = pace;
1503 }
1504
1505 /* Ensure when setting a POSIX ACL, that the uid for a
1506 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1507 permission entry as an SMB_ACL_USER, and a gid for a
1508 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1509 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1510 then if the ownership or group ownership of this file or
1511 directory gets changed, the user or group can lose their
1512 access. */
1513
1514 for (pace = *pp_ace; pace; pace = pace->next) {
1515 if (pace->type == SMB_ACL_USER &&
1516 pace->unix_ug.id == pace_user->unix_ug.id) {
1517 /* Already got one. */
1518 got_duplicate_user = true;
1519 } else if (pace->type == SMB_ACL_GROUP &&
1520 pace->unix_ug.id == pace_group->unix_ug.id) {
1521 /* Already got one. */
1522 got_duplicate_group = true;
1523 } else if ((pace->type == SMB_ACL_GROUP)
1524 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1525 /* If the SID owning the file appears
1526 * in a group entry, then we have
1527 * enough duplication, they will still
1528 * have access */
1529 got_duplicate_user = true;
1530 }
1531 }
1532
1533 /* If the SID is equal for the user and group that we need
1534 to add the duplicate for, add only the group */
1535 if (!got_duplicate_user && !got_duplicate_group
1536 && dom_sid_equal(&pace_group->trustee,
1537 &pace_user->trustee)) {
1538 /* Add a duplicate SMB_ACL_GROUP entry, this
1539 * will cover the owning SID as well, as it
1540 * will always be mapped to both a uid and
1541 * gid. */
1542
1543 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1544 DEBUG(0,("talloc fail.\n"));
1545 return false;
1546 }
1547
1548 ZERO_STRUCTP(pace);
1549 pace->type = SMB_ACL_GROUP;;
1550 pace->owner_type = GID_ACE;
1551 pace->unix_ug.type = ID_TYPE_GID;
1552 pace->unix_ug.id = pace_group->unix_ug.id;
1553 pace->trustee = pace_group->trustee;
1554 pace->attr = pace_group->attr;
1555 pace->perms = pace_group->perms;
1556
1557 DLIST_ADD(*pp_ace, pace);
1558
1559 /* We're done here, make sure the
1560 statements below are not executed. */
1561 got_duplicate_user = true;
1562 got_duplicate_group = true;
1563 }
1564
1565 if (!got_duplicate_user) {
1566 /* Add a duplicate SMB_ACL_USER entry. */
1567 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1568 DEBUG(0,("talloc fail.\n"));
1569 return false;
1570 }
1571
1572 ZERO_STRUCTP(pace);
1573 pace->type = SMB_ACL_USER;;
1574 pace->owner_type = UID_ACE;
1575 pace->unix_ug.type = ID_TYPE_UID;
1576 pace->unix_ug.id = pace_user->unix_ug.id;
1577 pace->trustee = pace_user->trustee;
1578 pace->attr = pace_user->attr;
1579 pace->perms = pace_user->perms;
1580
1581 DLIST_ADD(*pp_ace, pace);
1582
1583 got_duplicate_user = true;
1584 }
1585
1586 if (!got_duplicate_group) {
1587 /* Add a duplicate SMB_ACL_GROUP entry. */
1588 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1589 DEBUG(0,("talloc fail.\n"));
1590 return false;
1591 }
1592
1593 ZERO_STRUCTP(pace);
1594 pace->type = SMB_ACL_GROUP;;
1595 pace->owner_type = GID_ACE;
1596 pace->unix_ug.type = ID_TYPE_GID;
1597 pace->unix_ug.id = pace_group->unix_ug.id;
1598 pace->trustee = pace_group->trustee;
1599 pace->attr = pace_group->attr;
1600 pace->perms = pace_group->perms;
1601
1602 DLIST_ADD(*pp_ace, pace);
1603
1604 got_duplicate_group = true;
1605 }
1606
1607 return true;
1608 }
1609
1610 /****************************************************************************
1611 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1612 If it does not have them, check if there are any entries where the trustee is the
1613 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1614 Note we must not do this to default directory ACLs.
1615 ****************************************************************************/
1616
1617 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1618 {
1619 bool got_user_obj, got_group_obj;
1620 canon_ace *current_ace;
1621 int i, entries;
1622
1623 entries = count_canon_ace_list(ace);
1624 got_user_obj = False;
1625 got_group_obj = False;
1626
1627 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1628 if (current_ace->type == SMB_ACL_USER_OBJ)
1629 got_user_obj = True;
1630 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1631 got_group_obj = True;
1632 }
1633 if (got_user_obj && got_group_obj) {
1634 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1635 return;
1636 }
1637
1638 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1639 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1640 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1641 current_ace->type = SMB_ACL_USER_OBJ;
1642 got_user_obj = True;
1643 }
1644 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1645 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1646 current_ace->type = SMB_ACL_GROUP_OBJ;
1647 got_group_obj = True;
1648 }
1649 }
1650 if (!got_user_obj)
1651 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1652 if (!got_group_obj)
1653 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1654 }
1655
1656 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1657 canon_ace **file_ace, canon_ace **dir_ace,
1658 bool *got_file_allow, bool *got_dir_allow,
1659 bool *all_aces_are_inherit_only,
1660 canon_ace *current_ace)
1661 {
1662
1663 /*
1664 * Map the given NT permissions into a UNIX mode_t containing only
1665 * S_I(R|W|X)USR bits.
1666 */
1667
1668 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1669 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1670
1671 /* Store the ace_flag. */
1672 current_ace->ace_flags = psa->flags;
1673
1674 /*
1675 * Now add the created ace to either the file list, the directory
1676 * list, or both. We *MUST* preserve the order here (hence we use
1677 * DLIST_ADD_END) as NT ACLs are order dependent.
1678 */
1679
1680 if (fsp->is_directory) {
1681
1682 /*
1683 * We can only add to the default POSIX ACE list if the ACE is
1684 * designed to be inherited by both files and directories.
1685 */
1686
1687 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1688 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1689
1690 canon_ace *current_dir_ace = current_ace;
1691 DLIST_ADD_END(*dir_ace, current_ace);
1692
1693 /*
1694 * Note if this was an allow ace. We can't process
1695 * any further deny ace's after this.
1696 */
1697
1698 if (current_ace->attr == ALLOW_ACE)
1699 *got_dir_allow = True;
1700
1701 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1702 DEBUG(0,("add_current_ace_to_acl: "
1703 "malformed ACL in "
1704 "inheritable ACL! Deny entry "
1705 "after Allow entry. Failing "
1706 "to set on file %s.\n",
1707 fsp_str_dbg(fsp)));
1708 return False;
1709 }
1710
1711 if( DEBUGLVL( 10 )) {
1712 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1713 print_canon_ace( current_ace, 0);
1714 }
1715
1716 /*
1717 * If this is not an inherit only ACE we need to add a duplicate
1718 * to the file acl.
1719 */
1720
1721 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1722 canon_ace *dup_ace = dup_canon_ace(current_ace);
1723
1724 if (!dup_ace) {
1725 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1726 return False;
1727 }
1728
1729 /*
1730 * We must not free current_ace here as its
1731 * pointer is now owned by the dir_ace list.
1732 */
1733 current_ace = dup_ace;
1734 /* We've essentially split this ace into two,
1735 * and added the ace with inheritance request
1736 * bits to the directory ACL. Drop those bits for
1737 * the ACE we're adding to the file list. */
1738 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1739 SEC_ACE_FLAG_CONTAINER_INHERIT|
1740 SEC_ACE_FLAG_INHERIT_ONLY);
1741 } else {
1742 /*
1743 * We must not free current_ace here as its
1744 * pointer is now owned by the dir_ace list.
1745 */
1746 current_ace = NULL;
1747 }
1748
1749 /*
1750 * current_ace is now either owned by file_ace
1751 * or is NULL. We can safely operate on current_dir_ace
1752 * to treat mapping for default acl entries differently
1753 * than access acl entries.
1754 */
1755
1756 if (current_dir_ace->owner_type == UID_ACE) {
1757 /*
1758 * We already decided above this is a uid,
1759 * for default acls ace's only CREATOR_OWNER
1760 * maps to ACL_USER_OBJ. All other uid
1761 * ace's are ACL_USER.
1762 */
1763 if (dom_sid_equal(&current_dir_ace->trustee,
1764 &global_sid_Creator_Owner)) {
1765 current_dir_ace->type = SMB_ACL_USER_OBJ;
1766 } else {
1767 current_dir_ace->type = SMB_ACL_USER;
1768 }
1769 }
1770
1771 if (current_dir_ace->owner_type == GID_ACE) {
1772 /*
1773 * We already decided above this is a gid,
1774 * for default acls ace's only CREATOR_GROUP
1775 * maps to ACL_GROUP_OBJ. All other uid
1776 * ace's are ACL_GROUP.
1777 */
1778 if (dom_sid_equal(&current_dir_ace->trustee,
1779 &global_sid_Creator_Group)) {
1780 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1781 } else {
1782 current_dir_ace->type = SMB_ACL_GROUP;
1783 }
1784 }
1785 }
1786 }
1787
1788 /*
1789 * Only add to the file ACL if not inherit only.
1790 */
1791
1792 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1793 DLIST_ADD_END(*file_ace, current_ace);
1794
1795 /*
1796 * Note if this was an allow ace. We can't process
1797 * any further deny ace's after this.
1798 */
1799
1800 if (current_ace->attr == ALLOW_ACE)
1801 *got_file_allow = True;
1802
1803 if ((current_ace->attr == DENY_ACE) && *got_file_allow) {
1804 DEBUG(0,("add_current_ace_to_acl: malformed "
1805 "ACL in file ACL ! Deny entry after "
1806 "Allow entry. Failing to set on file "
1807 "%s.\n", fsp_str_dbg(fsp)));
1808 return False;
1809 }
1810
1811 if( DEBUGLVL( 10 )) {
1812 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1813 print_canon_ace( current_ace, 0);
1814 }
1815 *all_aces_are_inherit_only = False;
1816 /*
1817 * We must not free current_ace here as its
1818 * pointer is now owned by the file_ace list.
1819 */
1820 current_ace = NULL;
1821 }
1822
1823 /*
1824 * Free if ACE was not added.
1825 */
1826
1827 TALLOC_FREE(current_ace);
1828 return true;
1829 }
1830
1831 /****************************************************************************
1832 Unpack a struct security_descriptor into two canonical ace lists.
1833 ****************************************************************************/
1834
1835 static bool create_canon_ace_lists(files_struct *fsp,
1836 const SMB_STRUCT_STAT *pst,
1837 struct dom_sid *pfile_owner_sid,
1838 struct dom_sid *pfile_grp_sid,
1839 canon_ace **ppfile_ace,
1840 canon_ace **ppdir_ace,
1841 const struct security_acl *dacl)
1842 {
1843 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1844 canon_ace *file_ace = NULL;
1845 canon_ace *dir_ace = NULL;
1846 canon_ace *current_ace = NULL;
1847 bool got_dir_allow = False;
1848 bool got_file_allow = False;
1849 uint32_t i, j;
1850
1851 *ppfile_ace = NULL;
1852 *ppdir_ace = NULL;
1853
1854 /*
1855 * Convert the incoming ACL into a more regular form.
1856 */
1857
1858 for(i = 0; i < dacl->num_aces; i++) {
1859 struct security_ace *psa = &dacl->aces[i];
1860
1861 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1862 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1863 return False;
1864 }
1865 }
1866
1867 /*
1868 * Deal with the fact that NT 4.x re-writes the canonical format
1869 * that we return for default ACLs. If a directory ACE is identical
1870 * to a inherited directory ACE then NT changes the bits so that the
1871 * first ACE is set to OI|IO and the second ACE for this SID is set
1872 * to CI. We need to repair this. JRA.
1873 */
1874
1875 for(i = 0; i < dacl->num_aces; i++) {
1876 struct security_ace *psa1 = &dacl->aces[i];
1877
1878 for (j = i + 1; j < dacl->num_aces; j++) {
1879 struct security_ace *psa2 = &dacl->aces[j];
1880
1881 if (psa1->access_mask != psa2->access_mask)
1882 continue;
1883
1884 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1885 continue;
1886
1887 /*
1888 * Ok - permission bits and SIDs are equal.
1889 * Check if flags were re-written.
1890 */
1891
1892 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1893
1894 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1895 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1896
1897 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1898
1899 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1900 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1901
1902 }
1903 }
1904 }
1905
1906 for(i = 0; i < dacl->num_aces; i++) {
1907 struct security_ace *psa = &dacl->aces[i];
1908
1909 /*
1910 * Create a canon_ace entry representing this NT DACL ACE.
1911 */
1912
1913 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1914 free_canon_ace_list(file_ace);
1915 free_canon_ace_list(dir_ace);
1916 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1917 return False;
1918 }
1919
1920 ZERO_STRUCTP(current_ace);
1921
1922 sid_copy(&current_ace->trustee, &psa->trustee);
1923
1924 /*
1925 * Try and work out if the SID is a user or group
1926 * as we need to flag these differently for POSIX.
1927 * Note what kind of a POSIX ACL this should map to.
1928 */
1929
1930 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1931 current_ace->owner_type = WORLD_ACE;
1932 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1933 current_ace->unix_ug.id = -1;
1934 current_ace->type = SMB_ACL_OTHER;
1935 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1936 current_ace->owner_type = UID_ACE;
1937 current_ace->unix_ug.type = ID_TYPE_UID;
1938 current_ace->unix_ug.id = pst->st_ex_uid;
1939 current_ace->type = SMB_ACL_USER_OBJ;
1940
1941 /*
1942 * The Creator Owner entry only specifies inheritable permissions,
1943 * never access permissions. WinNT doesn't always set the ACE to
1944 * INHERIT_ONLY, though.
1945 */
1946
1947 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1948
1949 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1950 current_ace->owner_type = GID_ACE;
1951 current_ace->unix_ug.type = ID_TYPE_GID;
1952 current_ace->unix_ug.id = pst->st_ex_gid;
1953 current_ace->type = SMB_ACL_GROUP_OBJ;
1954
1955 /*
1956 * The Creator Group entry only specifies inheritable permissions,
1957 * never access permissions. WinNT doesn't always set the ACE to
1958 * INHERIT_ONLY, though.
1959 */
1960 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1961
1962 } else {
1963 struct unixid unixid;
1964
1965 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1966 free_canon_ace_list(file_ace);
1967 free_canon_ace_list(dir_ace);
1968 TALLOC_FREE(current_ace);
1969 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1970 "failed for %s (allocation failure)\n",
1971 sid_string_dbg(&current_ace->trustee)));
1972 return false;
1973 }
1974
1975 if (unixid.type == ID_TYPE_BOTH) {
1976 /*
1977 * We must add both a user and group
1978 * entry POSIX_ACL.
1979 * This is due to the fact that in POSIX
1980 * user entries are more specific than
1981 * groups.
1982 */
1983 current_ace->owner_type = UID_ACE;
1984 current_ace->unix_ug.type = ID_TYPE_UID;
1985 current_ace->unix_ug.id = unixid.id;
1986 current_ace->type =
1987 (unixid.id == pst->st_ex_uid) ?
1988 SMB_ACL_USER_OBJ :
1989 SMB_ACL_USER;
1990
1991 /* Add the user object to the posix ACL,
1992 and proceed to the group mapping
1993 below. This handles the talloc_free
1994 of current_ace if not added for some
1995 reason */
1996 if (!add_current_ace_to_acl(fsp,
1997 psa,
1998 &file_ace,
1999 &dir_ace,
2000 &got_file_allow,
2001 &got_dir_allow,
2002 &all_aces_are_inherit_only,
2003 current_ace)) {
2004 free_canon_ace_list(file_ace);
2005 free_canon_ace_list(dir_ace);
2006 return false;
2007 }
2008
2009 if ((current_ace = talloc(talloc_tos(),
2010 canon_ace)) == NULL) {
2011 free_canon_ace_list(file_ace);
2012 free_canon_ace_list(dir_ace);
2013 DEBUG(0,("create_canon_ace_lists: "
2014 "malloc fail.\n"));
2015 return False;
2016 }
2017
2018 ZERO_STRUCTP(current_ace);
2019
2020 sid_copy(&current_ace->trustee, &psa->trustee);
2021
2022 current_ace->unix_ug.type = ID_TYPE_GID;
2023 current_ace->unix_ug.id = unixid.id;
2024 current_ace->owner_type = GID_ACE;
2025 /* If it's the primary group, this is a
2026 group_obj, not a group. */
2027 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2028 current_ace->type = SMB_ACL_GROUP_OBJ;
2029 } else {
2030 current_ace->type = SMB_ACL_GROUP;
2031 }
2032
2033 } else if (unixid.type == ID_TYPE_UID) {
2034 current_ace->owner_type = UID_ACE;
2035 current_ace->unix_ug.type = ID_TYPE_UID;
2036 current_ace->unix_ug.id = unixid.id;
2037 /* If it's the owning user, this is a user_obj,
2038 not a user. */
2039 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2040 current_ace->type = SMB_ACL_USER_OBJ;
2041 } else {
2042 current_ace->type = SMB_ACL_USER;
2043 }
2044 } else if (unixid.type == ID_TYPE_GID) {
2045 current_ace->unix_ug.type = ID_TYPE_GID;
2046 current_ace->unix_ug.id = unixid.id;
2047 current_ace->owner_type = GID_ACE;
2048 /* If it's the primary group, this is a
2049 group_obj, not a group. */
2050 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2051 current_ace->type = SMB_ACL_GROUP_OBJ;
2052 } else {
2053 current_ace->type = SMB_ACL_GROUP;
2054 }
2055 } else {
2056 /*
2057 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2058 */
2059
2060 if (non_mappable_sid(&psa->trustee)) {
2061 DEBUG(10, ("create_canon_ace_lists: ignoring "
2062 "non-mappable SID %s\n",
2063 sid_string_dbg(&psa->trustee)));
2064 TALLOC_FREE(current_ace);
2065 continue;
2066 }
2067
2068 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2069 DEBUG(10, ("create_canon_ace_lists: ignoring "
2070 "unknown or foreign SID %s\n",
2071 sid_string_dbg(&psa->trustee)));
2072 TALLOC_FREE(current_ace);
2073 continue;
2074 }
2075
2076 free_canon_ace_list(file_ace);
2077 free_canon_ace_list(dir_ace);
2078 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2079 "%s to uid or gid.\n",
2080 sid_string_dbg(&current_ace->trustee)));
2081 TALLOC_FREE(current_ace);
2082 return false;
2083 }
2084 }
2085
2086 /* handles the talloc_free of current_ace if not added for some reason */
2087 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2088 &got_file_allow, &got_dir_allow,
2089 &all_aces_are_inherit_only, current_ace)) {
2090 free_canon_ace_list(file_ace);
2091 free_canon_ace_list(dir_ace);
2092 return false;
2093 }
2094 }
2095
2096 if (fsp->is_directory && all_aces_are_inherit_only) {
2097 /*
2098 * Windows 2000 is doing one of these weird 'inherit acl'
2099 * traverses to conserve NTFS ACL resources. Just pretend
2100 * there was no DACL sent. JRA.
2101 */
2102
2103 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2104 free_canon_ace_list(file_ace);
2105 free_canon_ace_list(dir_ace);
2106 file_ace = NULL;
2107 dir_ace = NULL;
2108 } else {
2109 /*
2110 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2111 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2112 * entries can be converted to *_OBJ. Don't do this for the default
2113 * ACL, we will create them separately for this if needed inside
2114 * ensure_canon_entry_valid_on_set().
2115 */
2116 if (file_ace) {
2117 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2118 }
2119 }
2120
2121 *ppfile_ace = file_ace;
2122 *ppdir_ace = dir_ace;
2123
2124 return True;
2125 }
2126
2127 /****************************************************************************
2128 ASCII art time again... JRA :-).
2129
2130 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2131 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2132 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2133 allow or deny have been merged, so the same SID can only appear once in the deny
2134 list or once in the allow list.
2135
2136 We then process as follows :
2137
2138 ---------------------------------------------------------------------------
2139 First pass - look for a Everyone DENY entry.
2140
2141 If it is deny all (rwx) trunate the list at this point.
2142 Else, walk the list from this point and use the deny permissions of this
2143 entry as a mask on all following allow entries. Finally, delete
2144 the Everyone DENY entry (we have applied it to everything possible).
2145
2146 In addition, in this pass we remove any DENY entries that have
2147 no permissions (ie. they are a DENY nothing).
2148 ---------------------------------------------------------------------------
2149 Second pass - only deal with deny user entries.
2150
2151 DENY user1 (perms XXX)
2152
2153 new_perms = 0
2154 for all following allow group entries where user1 is in group
2155 new_perms |= group_perms;
2156
2157 user1 entry perms = new_perms & ~ XXX;
2158
2159 Convert the deny entry to an allow entry with the new perms and
2160 push to the end of the list. Note if the user was in no groups
2161 this maps to a specific allow nothing entry for this user.
2162
2163 The common case from the NT ACL choser (userX deny all) is
2164 optimised so we don't do the group lookup - we just map to
2165 an allow nothing entry.
2166
2167 What we're doing here is inferring the allow permissions the
2168 person setting the ACE on user1 wanted by looking at the allow
2169 permissions on the groups the user is currently in. This will
2170 be a snapshot, depending on group membership but is the best
2171 we can do and has the advantage of failing closed rather than
2172 open.
2173 ---------------------------------------------------------------------------
2174 Third pass - only deal with deny group entries.
2175
2176 DENY group1 (perms XXX)
2177
2178 for all following allow user entries where user is in group1
2179 user entry perms = user entry perms & ~ XXX;
2180
2181 If there is a group Everyone allow entry with permissions YYY,
2182 convert the group1 entry to an allow entry and modify its
2183 permissions to be :
2184
2185 new_perms = YYY & ~ XXX
2186
2187 and push to the end of the list.
2188
2189 If there is no group Everyone allow entry then convert the
2190 group1 entry to a allow nothing entry and push to the end of the list.
2191
2192 Note that the common case from the NT ACL choser (groupX deny all)
2193 cannot be optimised here as we need to modify user entries who are
2194 in the group to change them to a deny all also.
2195
2196 What we're doing here is modifying the allow permissions of
2197 user entries (which are more specific in POSIX ACLs) to mask
2198 out the explicit deny set on the group they are in. This will
2199 be a snapshot depending on current group membership but is the
2200 best we can do and has the advantage of failing closed rather
2201 than open.
2202 ---------------------------------------------------------------------------
2203 Fourth pass - cope with cumulative permissions.
2204
2205 for all allow user entries, if there exists an allow group entry with
2206 more permissive permissions, and the user is in that group, rewrite the
2207 allow user permissions to contain both sets of permissions.
2208
2209 Currently the code for this is #ifdef'ed out as these semantics make
2210 no sense to me. JRA.
2211 ---------------------------------------------------------------------------
2212
2213 Note we *MUST* do the deny user pass first as this will convert deny user
2214 entries into allow user entries which can then be processed by the deny
2215 group pass.
2216
2217 The above algorithm took a *lot* of thinking about - hence this
2218 explaination :-). JRA.
2219 ****************************************************************************/
2220
2221 /****************************************************************************
2222 Process a canon_ace list entries. This is very complex code. We need
2223 to go through and remove the "deny" permissions from any allow entry that matches
2224 the id of this entry. We have already refused any NT ACL that wasn't in correct
2225 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2226 we just remove it (to fail safe). We have already removed any duplicate ace
2227 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2228 allow entries.
2229 ****************************************************************************/
2230
2231 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2232 {
2233 canon_ace *ace_list = *pp_ace_list;
2234 canon_ace *curr_ace = NULL;
2235 canon_ace *curr_ace_next = NULL;
2236
2237 /* Pass 1 above - look for an Everyone, deny entry. */
2238
2239 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2240 canon_ace *allow_ace_p;
2241
2242 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2243
2244 if (curr_ace->attr != DENY_ACE)
2245 continue;
2246
2247 if (curr_ace->perms == (mode_t)0) {
2248
2249 /* Deny nothing entry - delete. */
2250
2251 DLIST_REMOVE(ace_list, curr_ace);
2252 continue;
2253 }
2254
2255 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2256 continue;
2257
2258 /* JRATEST - assert. */
2259 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2260
2261 if (curr_ace->perms == ALL_ACE_PERMS) {
2262
2263 /*
2264 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2265 * list at this point including this entry.
2266 */
2267
2268 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2269
2270 free_canon_ace_list( curr_ace );
2271 if (prev_entry)
2272 DLIST_REMOVE(ace_list, prev_entry);
2273 else {
2274 /* We deleted the entire list. */
2275 ace_list = NULL;
2276 }
2277 break;
2278 }
2279
2280 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2281
2282 /*
2283 * Only mask off allow entries.
2284 */
2285
2286 if (allow_ace_p->attr != ALLOW_ACE)
2287 continue;
2288
2289 allow_ace_p->perms &= ~curr_ace->perms;
2290 }
2291
2292 /*
2293 * Now it's been applied, remove it.
2294 */
2295
2296 DLIST_REMOVE(ace_list, curr_ace);
2297 }
2298
2299 /* Pass 2 above - deal with deny user entries. */
2300
2301 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2302 mode_t new_perms = (mode_t)0;
2303 canon_ace *allow_ace_p;
2304
2305 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2306
2307 if (curr_ace->attr != DENY_ACE)
2308 continue;
2309
2310 if (curr_ace->owner_type != UID_ACE)
2311 continue;
2312
2313 if (curr_ace->perms == ALL_ACE_PERMS) {
2314
2315 /*
2316 * Optimisation - this is a deny everything to this user.
2317 * Convert to an allow nothing and push to the end of the list.
2318 */
2319
2320 curr_ace->attr = ALLOW_ACE;
2321 curr_ace->perms = (mode_t)0;
2322 DLIST_DEMOTE(ace_list, curr_ace);
2323 continue;
2324 }
2325
2326 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2327
2328 if (allow_ace_p->attr != ALLOW_ACE)
2329 continue;
2330
2331 /* We process GID_ACE and WORLD_ACE entries only. */
2332
2333 if (allow_ace_p->owner_type == UID_ACE)
2334 continue;
2335
2336 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2337 new_perms |= allow_ace_p->perms;
2338 }
2339
2340 /*
2341 * Convert to a allow entry, modify the perms and push to the end
2342 * of the list.
2343 */
2344
2345 curr_ace->attr = ALLOW_ACE;
2346 curr_ace->perms = (new_perms & ~curr_ace->perms);
2347 DLIST_DEMOTE(ace_list, curr_ace);
2348 }
2349
2350 /* Pass 3 above - deal with deny group entries. */
2351
2352 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2353 canon_ace *allow_ace_p;
2354 canon_ace *allow_everyone_p = NULL;
2355
2356 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2357
2358 if (curr_ace->attr != DENY_ACE)
2359 continue;
2360
2361 if (curr_ace->owner_type != GID_ACE)
2362 continue;
2363
2364 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2365
2366 if (allow_ace_p->attr != ALLOW_ACE)
2367 continue;
2368
2369 /* Store a pointer to the Everyone allow, if it exists. */
2370 if (allow_ace_p->owner_type == WORLD_ACE)
2371 allow_everyone_p = allow_ace_p;
2372
2373 /* We process UID_ACE entries only. */
2374
2375 if (allow_ace_p->owner_type != UID_ACE)
2376 continue;
2377
2378 /* Mask off the deny group perms. */
2379
2380 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2381 allow_ace_p->perms &= ~curr_ace->perms;
2382 }
2383
2384 /*
2385 * Convert the deny to an allow with the correct perms and
2386 * push to the end of the list.
2387 */
2388
2389 curr_ace->attr = ALLOW_ACE;
2390 if (allow_everyone_p)
2391 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2392 else
2393 curr_ace->perms = (mode_t)0;
2394 DLIST_DEMOTE(ace_list, curr_ace);
2395 }
2396
2397 /* Doing this fourth pass allows Windows semantics to be layered
2398 * on top of POSIX semantics. I'm not sure if this is desirable.
2399 * For example, in W2K ACLs there is no way to say, "Group X no
2400 * access, user Y full access" if user Y is a member of group X.
2401 * This seems completely broken semantics to me.... JRA.
2402 */
2403
2404 #if 0
2405 /* Pass 4 above - deal with allow entries. */
2406
2407 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2408 canon_ace *allow_ace_p;
2409
2410 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2411
2412 if (curr_ace->attr != ALLOW_ACE)
2413 continue;
2414
2415 if (curr_ace->owner_type != UID_ACE)
2416 continue;
2417
2418 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2419
2420 if (allow_ace_p->attr != ALLOW_ACE)
2421 continue;
2422
2423 /* We process GID_ACE entries only. */
2424
2425 if (allow_ace_p->owner_type != GID_ACE)
2426 continue;
2427
2428 /* OR in the group perms. */
2429
2430 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2431 curr_ace->perms |= allow_ace_p->perms;
2432 }
2433 }
2434 #endif
2435
2436 *pp_ace_list = ace_list;
2437 }
2438
2439 /****************************************************************************
2440 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2441 succeeding.
2442 ****************************************************************************/
2443
2444 static bool unpack_canon_ace(files_struct *fsp,
2445 const SMB_STRUCT_STAT *pst,
2446 struct dom_sid *pfile_owner_sid,
2447 struct dom_sid *pfile_grp_sid,
2448 canon_ace **ppfile_ace,
2449 canon_ace **ppdir_ace,
2450 uint32_t security_info_sent,
2451 const struct security_descriptor *psd)
2452 {
2453 canon_ace *file_ace = NULL;
2454 canon_ace *dir_ace = NULL;
2455
2456 *ppfile_ace = NULL;
2457 *ppdir_ace = NULL;
2458
2459 if(security_info_sent == 0) {
2460 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2461 return False;
2462 }
2463
2464 /*
2465 * If no DACL then this is a chown only security descriptor.
2466 */
2467
2468 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2469 return True;
2470
2471 /*
2472 * Now go through the DACL and create the canon_ace lists.
2473 */
2474
2475 if (!create_canon_ace_lists(fsp, pst, pfile_owner_sid, pfile_grp_sid,
2476 &file_ace, &dir_ace, psd->dacl)) {
2477 return False;
2478 }
2479
2480 if ((file_ace == NULL) && (dir_ace == NULL)) {
2481 /* W2K traverse DACL set - ignore. */
2482 return True;
2483 }
2484
2485 /*
2486 * Go through the canon_ace list and merge entries
2487 * belonging to identical users of identical allow or deny type.
2488 * We can do this as all deny entries come first, followed by
2489 * all allow entries (we have mandated this before accepting this acl).
2490 */
2491
2492 print_canon_ace_list( "file ace - before merge", file_ace);
2493 merge_aces( &file_ace, false);
2494
2495 print_canon_ace_list( "dir ace - before merge", dir_ace);
2496 merge_aces( &dir_ace, true);
2497
2498 /*
2499 * NT ACLs are order dependent. Go through the acl lists and
2500 * process DENY entries by masking the allow entries.
2501 */
2502
2503 print_canon_ace_list( "file ace - before deny", file_ace);
2504 process_deny_list(fsp->conn, &file_ace);
2505
2506 print_canon_ace_list( "dir ace - before deny", dir_ace);
2507 process_deny_list(fsp->conn, &dir_ace);
2508
2509 /*
2510 * A well formed POSIX file or default ACL has at least 3 entries, a
2511 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2512 * and optionally a mask entry. Ensure this is the case.
2513 */
2514
2515 print_canon_ace_list( "file ace - before valid", file_ace);
2516
2517 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2518 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2519 free_canon_ace_list(file_ace);
2520 free_canon_ace_list(dir_ace);
2521 return False;
2522 }
2523
2524 print_canon_ace_list( "dir ace - before valid", dir_ace);
2525
2526 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2527 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2528 free_canon_ace_list(file_ace);
2529 free_canon_ace_list(dir_ace);
2530 return False;
2531 }
2532
2533 print_canon_ace_list( "file ace - return", file_ace);
2534 print_canon_ace_list( "dir ace - return", dir_ace);
2535
2536 *ppfile_ace = file_ace;
2537 *ppdir_ace = dir_ace;
2538 return True;
2539
2540 }
2541
2542 /******************************************************************************
2543 When returning permissions, try and fit NT display
2544 semantics if possible. Note the the canon_entries here must have been malloced.
2545 The list format should be - first entry = owner, followed by group and other user
2546 entries, last entry = other.
2547
2548 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2549 are not ordered, and match on the most specific entry rather than walking a list,
2550 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2551
2552 Entry 0: owner : deny all except read and write.
2553 Entry 1: owner : allow read and write.
2554 Entry 2: group : deny all except read.
2555 Entry 3: group : allow read.
2556 Entry 4: Everyone : allow read.
2557
2558 But NT cannot display this in their ACL editor !
2559 ********************************************************************************/
2560
2561 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2562 {
2563 canon_ace *l_head = *pp_list_head;
2564 canon_ace *owner_ace = NULL;
2565 canon_ace *other_ace = NULL;
2566 canon_ace *ace = NULL;
2567
2568 for (ace = l_head; ace; ace = ace->next) {
2569 if (ace->type == SMB_ACL_USER_OBJ)
2570 owner_ace = ace;
2571 else if (ace->type == SMB_ACL_OTHER) {
2572 /* Last ace - this is "other" */
2573 other_ace = ace;
2574 }
2575 }
2576
2577 if (!owner_ace || !other_ace) {
2578 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2579 filename ));
2580 return;
2581 }
2582
2583 /*
2584 * The POSIX algorithm applies to owner first, and other last,
2585 * so ensure they are arranged in this order.
2586 */
2587
2588 if (owner_ace) {
2589 DLIST_PROMOTE(l_head, owner_ace);
2590 }
2591
2592 if (other_ace) {
2593 DLIST_DEMOTE(l_head, other_ace);
2594 }
2595
2596 /* We have probably changed the head of the list. */
2597
2598 *pp_list_head = l_head;
2599 }
2600
2601 /****************************************************************************
2602 Create a linked list of canonical ACE entries.
2603 ****************************************************************************/
2604
2605 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2606 const char *fname, SMB_ACL_T posix_acl,
2607 const SMB_STRUCT_STAT *psbuf,
2608 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2609 {
2610 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2611 canon_ace *l_head = NULL;
2612 canon_ace *ace = NULL;
2613 canon_ace *next_ace = NULL;
2614 int entry_id = SMB_ACL_FIRST_ENTRY;
2615 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2616 SMB_ACL_ENTRY_T entry;
2617 size_t ace_count;
2618
2619 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2620 SMB_ACL_TAG_T tagtype;
2621 SMB_ACL_PERMSET_T permset;
2622 struct dom_sid sid;
2623 struct unixid unix_ug;
2624 enum ace_owner owner_type;
2625
2626 entry_id = SMB_ACL_NEXT_ENTRY;
2627
2628 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2629 continue;
2630
2631 if (sys_acl_get_permset(entry, &permset) == -1)
2632 continue;
2633
2634 /* Decide which SID to use based on the ACL type. */
2635 switch(tagtype) {
2636 case SMB_ACL_USER_OBJ:
2637 /* Get the SID from the owner. */
2638 sid_copy(&sid, powner);
2639 unix_ug.type = ID_TYPE_UID;
2640 unix_ug.id = psbuf->st_ex_uid;
2641 owner_type = UID_ACE;
2642 break;
2643 case SMB_ACL_USER:
2644 {
2645 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2646 if (puid == NULL) {
2647 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2648 continue;
2649 }
2650 uid_to_sid( &sid, *puid);
2651 unix_ug.type = ID_TYPE_UID;
2652 unix_ug.id = *puid;
2653 owner_type = UID_ACE;
2654 break;
2655 }
2656 case SMB_ACL_GROUP_OBJ:
2657 /* Get the SID from the owning group. */
2658 sid_copy(&sid, pgroup);
2659 unix_ug.type = ID_TYPE_GID;
2660 unix_ug.id = psbuf->st_ex_gid;
2661 owner_type = GID_ACE;
2662 break;
2663 case SMB_ACL_GROUP:
2664 {
2665 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2666 if (pgid == NULL) {
2667 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2668 continue;
2669 }
2670 gid_to_sid( &sid, *pgid);
2671 unix_ug.type = ID_TYPE_GID;
2672 unix_ug.id = *pgid;
2673 owner_type = GID_ACE;
2674 break;
2675 }
2676 case SMB_ACL_MASK:
2677 acl_mask = convert_permset_to_mode_t(permset);
2678 continue; /* Don't count the mask as an entry. */
2679 case SMB_ACL_OTHER:
2680 /* Use the Everyone SID */
2681 sid = global_sid_World;
2682 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2683 unix_ug.id = -1;
2684 owner_type = WORLD_ACE;
2685 break;
2686 default:
2687 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2688 continue;
2689 }
2690
2691 /*
2692 * Add this entry to the list.
2693 */
2694
2695 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2696 goto fail;
2697
2698 *ace = (canon_ace) {
2699 .type = tagtype,
2700 .perms = convert_permset_to_mode_t(permset),
2701 .attr = ALLOW_ACE,
2702 .trustee = sid,
2703 .unix_ug = unix_ug,
2704 .owner_type = owner_type
2705 };
2706 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2707
2708 DLIST_ADD(l_head, ace);
2709 }
2710
2711 /*
2712 * This next call will ensure we have at least a user/group/world set.
2713 */
2714
2715 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2716 powner, pgroup,
2717 psbuf))
2718 goto fail;
2719
2720 /*
2721 * Now go through the list, masking the permissions with the
2722 * acl_mask. Ensure all DENY Entries are at the start of the list.
2723 */
2724
2725 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2726
2727 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2728 next_ace = ace->next;
2729
2730 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2731 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2732 ace->perms &= acl_mask;
2733
2734 if (ace->perms == 0) {
2735 DLIST_PROMOTE(l_head, ace);
2736 }
2737
2738 if( DEBUGLVL( 10 ) ) {
2739 print_canon_ace(ace, ace_count);
2740 }
2741 }
2742
2743 arrange_posix_perms(fname,&l_head );
2744
2745 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2746
2747 return l_head;
2748
2749 fail:
2750
2751 free_canon_ace_list(l_head);
2752 return NULL;
2753 }
2754
2755 /****************************************************************************
2756 Check if the current user group list contains a given group.
2757 ****************************************************************************/
2758
2759 bool current_user_in_group(connection_struct *conn, gid_t gid)
2760 {
2761 uint32_t i;
2762 const struct security_unix_token *utok = get_current_utok(conn);
2763
2764 for (i = 0; i < utok->ngroups; i++) {
2765 if (utok->groups[i] == gid) {
2766 return True;
2767 }
2768 }
2769
2770 return False;
2771 }
2772
2773 /****************************************************************************
2774 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2775 ****************************************************************************/
2776
2777 static bool acl_group_override(connection_struct *conn,
2778 const struct smb_filename *smb_fname)
2779 {
2780 if ((errno != EPERM) && (errno != EACCES)) {
2781 return false;
2782 }
2783
2784 /* file primary group == user primary or supplementary group */
2785 if (lp_acl_group_control(SNUM(conn)) &&
2786 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2787 return true;
2788 }
2789
2790 /* user has writeable permission */
2791 if (lp_dos_filemode(SNUM(conn)) &&
2792 can_write_to_file(conn, smb_fname)) {
2793 return true;
2794 }
2795
2796 return false;
2797 }
2798
2799 /****************************************************************************
2800 Attempt to apply an ACL to a file or directory.
2801 ****************************************************************************/
2802
2803 static bool set_canon_ace_list(files_struct *fsp,
2804 canon_ace *the_ace,
2805 bool default_ace,
2806 const SMB_STRUCT_STAT *psbuf,
2807 bool *pacl_set_support)
2808 {
2809 connection_struct *conn = fsp->conn;
2810 bool ret = False;
2811 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2812 canon_ace *p_ace;
2813 int i;
2814 SMB_ACL_ENTRY_T mask_entry;
2815 bool got_mask_entry = False;
2816 SMB_ACL_PERMSET_T mask_permset;
2817 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2818 bool needs_mask = False;
2819 mode_t mask_perms = 0;
2820
2821 /* Use the psbuf that was passed in. */
2822 if (psbuf != &fsp->fsp_name->st) {
2823 fsp->fsp_name->st = *psbuf;
2824 }
2825
2826 #if defined(POSIX_ACL_NEEDS_MASK)
2827 /* HP-UX always wants to have a mask (called "class" there). */
2828 needs_mask = True;
2829 #endif
2830
2831 if (the_acl == NULL) {
2832 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2833 return false;
2834 }
2835
2836 if( DEBUGLVL( 10 )) {
2837 dbgtext("set_canon_ace_list: setting ACL:\n");
2838 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2839 print_canon_ace( p_ace, i);
2840 }
2841 }
2842
2843 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2844 SMB_ACL_ENTRY_T the_entry;
2845 SMB_ACL_PERMSET_T the_permset;
2846
2847 /*
2848 * ACLs only "need" an ACL_MASK entry if there are any named user or
2849 * named group entries. But if there is an ACL_MASK entry, it applies
2850 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2851 * so that it doesn't deny (i.e., mask off) any permissions.
2852 */
2853
2854 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2855 needs_mask = True;
2856 mask_perms |= p_ace->perms;
2857 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2858 mask_perms |= p_ace->perms;
2859 }
2860
2861 /*
2862 * Get the entry for this ACE.
2863 */
2864
2865 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2866 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2867 i, strerror(errno) ));
2868 goto fail;
2869 }
2870
2871 if (p_ace->type == SMB_ACL_MASK) {
2872 mask_entry = the_entry;
2873 got_mask_entry = True;
2874 }
2875
2876 /*
2877 * Ok - we now know the ACL calls should be working, don't
2878 * allow fallback to chmod.
2879 */
2880
2881 *pacl_set_support = True;
2882
2883 /*
2884 * Initialise the entry from the canon_ace.
2885 */
2886
2887 /*
2888 * First tell the entry what type of ACE this is.
2889 */
2890
2891 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2892 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2893 i, strerror(errno) ));
2894 goto fail;
2895 }
2896
2897 /*
2898 * Only set the qualifier (user or group id) if the entry is a user
2899 * or group id ACE.
2900 */
2901
2902 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2903 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2904 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2905 i, strerror(errno) ));
2906 goto fail;
2907 }
2908 }
2909
2910 /*
2911 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2912 */
2913
2914 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2915 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2916 i, strerror(errno) ));
2917 goto fail;
2918 }
2919
2920 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2921 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2922 (unsigned int)p_ace->perms, i, strerror(errno) ));
2923 goto fail;
2924 }
2925
2926 /*
2927 * ..and apply them to the entry.
2928 */
2929
2930 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2931 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2932 i, strerror(errno) ));
2933 goto fail;
2934 }
2935
2936 if( DEBUGLVL( 10 ))
2937 print_canon_ace( p_ace, i);
2938
2939 }
2940
2941 if (needs_mask && !got_mask_entry) {
2942 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2943 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2944 goto fail;
2945 }
2946
2947 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2948 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2949 goto fail;
2950 }
2951
2952 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2953 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2954 goto fail;
2955 }
2956
2957 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2958 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2959 goto fail;
2960 }
2961
2962 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2963 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2964 goto fail;
2965 }
2966 }
2967
2968 /*
2969 * Finally apply it to the file or directory.
2970 */
2971
2972 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2973 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2974 the_acl_type, the_acl) == -1) {
2975 /*
2976 * Some systems allow all the above calls and only fail with no ACL support
2977 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2978 */
2979 if (no_acl_syscall_error(errno)) {
2980 *pacl_set_support = False;
2981 }
2982
2983 if (acl_group_override(conn, fsp->fsp_name)) {
2984 int sret;
2985
2986 DEBUG(5,("set_canon_ace_list: acl group "
2987 "control on and current user in file "
2988 "%s primary group.\n",
2989 fsp_str_dbg(fsp)));
2990
2991 become_root();
2992 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2993 fsp->fsp_name->base_name, the_acl_type,
2994 the_acl);
2995 unbecome_root();
2996 if (sret == 0) {
2997 ret = True;
2998 }
2999 }
3000
3001 if (ret == False) {
3002 DEBUG(2,("set_canon_ace_list: "
3003 "sys_acl_set_file type %s failed for "
3004 "file %s (%s).\n",
3005 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3006 "directory default" : "file",
3007 fsp_str_dbg(fsp), strerror(errno)));
3008 goto fail;
3009 }
3010 }
3011 } else {
3012 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3013 /*
3014 * Some systems allow all the above calls and only fail with no ACL support
3015 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3016 */
3017 if (no_acl_syscall_error(errno)) {
3018 *pacl_set_support = False;
3019 }
3020
3021 if (acl_group_override(conn, fsp->fsp_name)) {
3022 int sret;
3023
3024 DEBUG(5,("set_canon_ace_list: acl group "
3025 "control on and current user in file "
3026 "%s primary group.\n",
3027 fsp_str_dbg(fsp)));
3028
3029 become_root();
3030 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3031 unbecome_root();
3032 if (sret == 0) {
3033 ret = True;
3034 }
3035 }
3036
3037 if (ret == False) {
3038 DEBUG(2,("set_canon_ace_list: "
3039 "sys_acl_set_file failed for file %s "
3040 "(%s).\n",
3041 fsp_str_dbg(fsp), strerror(errno)));
3042 goto fail;
3043 }
3044 }
3045 }
3046
3047 ret = True;
3048
3049 fail:
3050
3051 if (the_acl != NULL) {
3052 TALLOC_FREE(the_acl);
3053 }
3054
3055 return ret;
3056 }
3057
3058 /****************************************************************************
3059
3060 ****************************************************************************/
3061
3062 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3063 {
3064 SMB_ACL_ENTRY_T entry;
3065
3066 if (!the_acl)
3067 return NULL;
3068 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3069 TALLOC_FREE(the_acl);
3070 return NULL;
3071 }
3072 return the_acl;
3073 }
3074
3075 /****************************************************************************
3076 Convert a canon_ace to a generic 3 element permission - if possible.
3077 ****************************************************************************/
3078
3079 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3080
3081 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3082 {
3083 size_t ace_count = count_canon_ace_list(file_ace_list);
3084 canon_ace *ace_p;
3085 canon_ace *owner_ace = NULL;
3086 canon_ace *group_ace = NULL;
3087 canon_ace *other_ace = NULL;
3088
3089 if (ace_count > 5) {
3090 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3091 "entries for file %s to convert to posix perms.\n",
3092 fsp_str_dbg(fsp)));
3093 return False;
3094 }
3095
3096 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3097 if (ace_p->owner_type == UID_ACE)
3098 owner_ace = ace_p;
3099 else if (ace_p->owner_type == GID_ACE)
3100 group_ace = ace_p;
3101 else if (ace_p->owner_type == WORLD_ACE)
3102 other_ace = ace_p;
3103 }
3104
3105 if (!owner_ace || !group_ace || !other_ace) {
3106 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3107 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3108 return False;
3109 }
3110
3111 /*
3112 * Ensure all ACE entries are owner, group or other.
3113 * We can't set if there are any other SIDs.
3114 */
3115 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3116 if (ace_p == owner_ace || ace_p == group_ace ||
3117 ace_p == other_ace) {
3118 continue;
3119 }
3120 if (ace_p->owner_type == UID_ACE) {
3121 if (ace_p->unix_ug.id != owner_ace->unix_ug.id) {
3122 DEBUG(3,("Invalid uid %u in ACE for file %s.\n",
3123 (unsigned int)ace_p->unix_ug.id,
3124 fsp_str_dbg(fsp)));
3125 return false;
3126 }
3127 } else if (ace_p->owner_type == GID_ACE) {
3128 if (ace_p->unix_ug.id != group_ace->unix_ug.id) {
3129 DEBUG(3,("Invalid gid %u in ACE for file %s.\n",
3130 (unsigned int)ace_p->unix_ug.id,
3131 fsp_str_dbg(fsp)));
3132 return false;
3133 }
3134 } else {
3135 /*
3136 * There should be no duplicate WORLD_ACE entries.
3137 */
3138
3139 DEBUG(3,("Invalid type %u, uid %u in "
3140 "ACE for file %s.\n",
3141 (unsigned int)ace_p->owner_type,
3142 (unsigned int)ace_p->unix_ug.id,
3143 fsp_str_dbg(fsp)));
3144 return false;
3145 }
3146 }
3147
3148 *posix_perms = (mode_t)0;
3149
3150 *posix_perms |= owner_ace->perms;
3151 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3152 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3153 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3154 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3155 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3156 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3157
3158 /* The owner must have at least read access. */
3159
3160 *posix_perms |= S_IRUSR;
3161 if (fsp->is_directory)
3162 *posix_perms |= (S_IWUSR|S_IXUSR);
3163
3164 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3165 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3166 (int)group_ace->perms, (int)other_ace->perms,
3167 (int)*posix_perms, fsp_str_dbg(fsp)));
3168
3169 return True;
3170 }
3171
3172 /****************************************************************************
3173 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3174 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3175 with CI|OI set so it is inherited and also applies to the directory.
3176 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3177 ****************************************************************************/
3178
3179 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3180 {
3181 size_t i, j;
3182
3183 for (i = 0; i < num_aces; i++) {
3184 for (j = i+1; j < num_aces; j++) {
3185 uint32_t i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3186 uint32_t j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3187 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3188 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3189
3190 /* We know the lower number ACE's are file entries. */
3191 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3192 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3193 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3194 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3195 (i_inh == j_inh) &&
3196 (i_flags_ni == 0) &&
3197 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3198 SEC_ACE_FLAG_CONTAINER_INHERIT|
3199 SEC_ACE_FLAG_INHERIT_ONLY))) {
3200 /*
3201 * W2K wants to have access allowed zero access ACE's
3202 * at the end of the list. If the mask is zero, merge
3203 * the non-inherited ACE onto the inherited ACE.
3204 */
3205
3206 if (nt_ace_list[i].access_mask == 0) {
3207 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3208 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3209 if (num_aces - i - 1 > 0)
3210 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3211 sizeof(struct security_ace));
3212
3213 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3214 (unsigned int)i, (unsigned int)j ));
3215 } else {
3216 /*
3217 * These are identical except for the flags.
3218 * Merge the inherited ACE onto the non-inherited ACE.
3219 */
3220
3221 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3222 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3223 if (num_aces - j - 1 > 0)
3224 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3225 sizeof(struct security_ace));
3226
3227 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3228 (unsigned int)j, (unsigned int)i ));
3229 }
3230 num_aces--;
3231 break;
3232 }
3233 }
3234 }
3235
3236 return num_aces;
3237 }
3238
3239 /*
3240 * Add or Replace ACE entry.
3241 * In some cases we need to add a specific ACE for compatibility reasons.
3242 * When doing that we must make sure we are not actually creating a duplicate
3243 * entry. So we need to search whether an ACE entry already exist and eventually
3244 * replacce the access mask, or add a completely new entry if none was found.
3245 *
3246 * This function assumes the array has enough space to add a new entry without
3247 * any reallocation of memory.
3248 */
3249
3250 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3251 const struct dom_sid *sid, enum security_ace_type type,
3252 uint32_t mask, uint8_t flags)
3253 {
3254 size_t i;
3255
3256 /* first search for a duplicate */
3257 for (i = 0; i < *num_aces; i++) {
3258 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3259 (nt_ace_list[i].flags == flags)) break;
3260 }
3261
3262 if (i < *num_aces) { /* found */
3263 nt_ace_list[i].type = type;
3264 nt_ace_list[i].access_mask = mask;
3265 DEBUG(10, ("Replacing ACE %zu with SID %s and flags %02x\n",
3266 i, sid_string_dbg(sid), flags));
3267 return;
3268 }
3269
3270 /* not found, append it */
3271 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3272 }
3273
3274
3275 /****************************************************************************
3276 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3277 the space for the return elements and returns the size needed to return the
3278 security descriptor. This should be the only external function needed for
3279 the UNIX style get ACL.
3280 ****************************************************************************/
3281
3282 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3283 const char *name,
3284 const SMB_STRUCT_STAT *sbuf,
3285 struct pai_val *pal,
3286 SMB_ACL_T posix_acl,
3287 SMB_ACL_T def_acl,
3288 uint32_t security_info,
3289 TALLOC_CTX *mem_ctx,
3290 struct security_descriptor **ppdesc)
3291 {
3292 struct dom_sid owner_sid;
3293 struct dom_sid group_sid;
3294 size_t sd_size = 0;
3295 struct security_acl *psa = NULL;
3296 size_t num_acls = 0;
3297 size_t num_def_acls = 0;
3298 size_t num_aces = 0;
3299 canon_ace *file_ace = NULL;
3300 canon_ace *dir_ace = NULL;
3301 struct security_ace *nt_ace_list = NULL;
3302 size_t num_profile_acls = 0;
3303 struct dom_sid orig_owner_sid;
3304 struct security_descriptor *psd = NULL;
3305
3306 /*
3307 * Get the owner, group and world SIDs.
3308 */
3309
3310 create_file_sids(sbuf, &owner_sid, &group_sid);
3311
3312 if (lp_profile_acls(SNUM(conn))) {
3313 /* For WXP SP1 the owner must be administrators. */
3314 sid_copy(&orig_owner_sid, &owner_sid);
3315 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3316 sid_copy(&group_sid, &global_sid_Builtin_Users);
3317 num_profile_acls = 3;
3318 }
3319
3320 if (security_info & SECINFO_DACL) {
3321
3322 /*
3323 * In the optimum case Creator Owner and Creator Group would be used for
3324 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3325 * would lead to usability problems under Windows: The Creator entries
3326 * are only available in browse lists of directories and not for files;
3327 * additionally the identity of the owning group couldn't be determined.
3328 * We therefore use those identities only for Default ACLs.
3329 */
3330
3331 /* Create the canon_ace lists. */
3332 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3333 &owner_sid, &group_sid, pal,
3334 SMB_ACL_TYPE_ACCESS);
3335
3336 /* We must have *some* ACLS. */
3337
3338 if (count_canon_ace_list(file_ace) == 0) {
3339 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3340 goto done;
3341 }
3342
3343 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3344 dir_ace = canonicalise_acl(conn, name, def_acl,
3345 sbuf,
3346 &global_sid_Creator_Owner,
3347 &global_sid_Creator_Group,
3348 pal, SMB_ACL_TYPE_DEFAULT);
3349 }
3350
3351 /*
3352 * Create the NT ACE list from the canonical ace lists.
3353 */
3354
3355 {
3356 canon_ace *ace;
3357 enum security_ace_type nt_acl_type;
3358
3359 num_acls = count_canon_ace_list(file_ace);
3360 num_def_acls = count_canon_ace_list(dir_ace);
3361
3362 nt_ace_list = talloc_zero_array(
3363 talloc_tos(), struct security_ace,
3364 num_acls + num_profile_acls + num_def_acls);
3365
3366 if (nt_ace_list == NULL) {
3367 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3368 goto done;
3369 }
3370
3371 /*
3372 * Create the NT ACE list from the canonical ace lists.
3373 */
3374
3375 for (ace = file_ace; ace != NULL; ace = ace->next) {
3376 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3377 &nt_acl_type,
3378 ace->perms,
3379 S_ISDIR(sbuf->st_ex_mode));
3380 init_sec_ace(&nt_ace_list[num_aces++],
3381 &ace->trustee,
3382 nt_acl_type,
3383 acc,
3384 ace->ace_flags);
3385 }
3386
3387 /* The User must have access to a profile share - even
3388 * if we can't map the SID. */
3389 if (lp_profile_acls(SNUM(conn))) {
3390 add_or_replace_ace(nt_ace_list, &num_aces,
3391 &global_sid_Builtin_Users,
3392 SEC_ACE_TYPE_ACCESS_ALLOWED,
3393 FILE_GENERIC_ALL, 0);
3394 }
3395
3396 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3397 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3398 &nt_acl_type,
3399 ace->perms,
3400 S_ISDIR(sbuf->st_ex_mode));
3401 init_sec_ace(&nt_ace_list[num_aces++],
3402 &ace->trustee,
3403 nt_acl_type,
3404 acc,
3405 ace->ace_flags |
3406 SEC_ACE_FLAG_OBJECT_INHERIT|
3407 SEC_ACE_FLAG_CONTAINER_INHERIT|
3408 SEC_ACE_FLAG_INHERIT_ONLY);
3409 }
3410
3411 /* The User must have access to a profile share - even
3412 * if we can't map the SID. */
3413 if (lp_profile_acls(SNUM(conn))) {
3414 add_or_replace_ace(nt_ace_list, &num_aces,
3415 &global_sid_Builtin_Users,
3416 SEC_ACE_TYPE_ACCESS_ALLOWED,
3417 FILE_GENERIC_ALL,
3418 SEC_ACE_FLAG_OBJECT_INHERIT |
3419 SEC_ACE_FLAG_CONTAINER_INHERIT |
3420 SEC_ACE_FLAG_INHERIT_ONLY);
3421 }
3422
3423 /*
3424 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3425 * Win2K needs this to get the inheritance correct when replacing ACLs
3426 * on a directory tree. Based on work by Jim @ IBM.
3427 */
3428
3429 num_aces = merge_default_aces(nt_ace_list, num_aces);
3430
3431 if (lp_profile_acls(SNUM(conn))) {
3432 size_t i;
3433
3434 for (i = 0; i < num_aces; i++) {
3435 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3436 add_or_replace_ace(nt_ace_list, &num_aces,
3437 &orig_owner_sid,
3438 nt_ace_list[i].type,
3439 nt_ace_list[i].access_mask,
3440 nt_ace_list[i].flags);
3441 break;
3442 }
3443 }
3444 }
3445 }
3446
3447 if (num_aces) {
3448 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3449 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3450 goto done;
3451 }
3452 }
3453 } /* security_info & SECINFO_DACL */
3454
3455 psd = make_standard_sec_desc(mem_ctx,
3456 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3457 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3458 psa,
3459 &sd_size);
3460
3461 if(!psd) {
3462 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3463 sd_size = 0;
3464 goto done;
3465 }
3466
3467 /*
3468 * Windows 2000: The DACL_PROTECTED flag in the security
3469 * descriptor marks the ACL as non-inheriting, i.e., no
3470 * ACEs from higher level directories propagate to this
3471 * ACL. In the POSIX ACL model permissions are only
3472 * inherited at file create time, so ACLs never contain
3473 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3474 * flag doesn't seem to bother Windows NT.
3475 * Always set this if map acl inherit is turned off.
3476 */
3477 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3478 psd->type |= SEC_DESC_DACL_PROTECTED;
3479 } else {
3480 psd->type |= pal->sd_type;
3481 }
3482
3483 if (psd->dacl) {
3484 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3485 }
3486
3487 *ppdesc = psd;
3488
3489 done:
3490
3491 if (posix_acl) {
3492 TALLOC_FREE(posix_acl);
3493 }
3494 if (def_acl) {
3495 TALLOC_FREE(def_acl);
3496 }
3497 free_canon_ace_list(file_ace);
3498 free_canon_ace_list(dir_ace);
3499 free_inherited_info(pal);
3500 TALLOC_FREE(nt_ace_list);
3501
3502 return NT_STATUS_OK;
3503 }
3504
3505 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3506 TALLOC_CTX *mem_ctx,
3507 struct security_descriptor **ppdesc)
3508 {
3509 SMB_STRUCT_STAT sbuf;
3510 SMB_ACL_T posix_acl = NULL;
3511 struct pai_val *pal;
3512 TALLOC_CTX *frame = talloc_stackframe();
3513 NTSTATUS status;
3514
3515 *ppdesc = NULL;
3516
3517 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3518 fsp_str_dbg(fsp)));
3519
3520 /* can it happen that fsp_name == NULL ? */
3521 if (fsp->is_directory || fsp->fh->fd == -1) {
3522 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3523 security_info, mem_ctx, ppdesc);
3524 TALLOC_FREE(frame);
3525 return status;
3526 }
3527
3528 /* Get the stat struct for the owner info. */
3529 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3530 TALLOC_FREE(frame);
3531 return map_nt_error_from_unix(errno);
3532 }
3533
3534 /* Get the ACL from the fd. */
3535 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3536
3537 pal = fload_inherited_info(fsp);
3538
3539 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3540 &sbuf, pal, posix_acl, NULL,
3541 security_info, mem_ctx, ppdesc);
3542 TALLOC_FREE(frame);
3543 return status;
3544 }
3545
3546 NTSTATUS posix_get_nt_acl(struct connection_struct *conn,
3547 const struct smb_filename *smb_fname_in,
3548 uint32_t security_info,
3549 TALLOC_CTX *mem_ctx,
3550 struct security_descriptor **ppdesc)
3551 {
3552 SMB_ACL_T posix_acl = NULL;
3553 SMB_ACL_T def_acl = NULL;
3554 struct pai_val *pal;
3555 struct smb_filename *smb_fname = NULL;
3556 int ret;
3557 TALLOC_CTX *frame = talloc_stackframe();
3558 NTSTATUS status;
3559
3560 *ppdesc = NULL;
3561
3562 DEBUG(10,("posix_get_nt_acl: called for file %s\n",
3563 smb_fname_in->base_name ));
3564
3565 smb_fname = cp_smb_filename(talloc_tos(), smb_fname_in);
3566 if (smb_fname == NULL) {
3567 TALLOC_FREE(frame);
3568 return NT_STATUS_NO_MEMORY;
3569 }
3570
3571 /* Get the stat struct for the owner info. */
3572 /*
3573 * We can directly use SMB_VFS_STAT here, as if this was a
3574 * POSIX call on a symlink, we've already refused it.
3575 * For a Windows acl mapped call on a symlink, we want to follow
3576 * it.
3577 */
3578 ret = SMB_VFS_STAT(conn, smb_fname);
3579
3580 if (ret == -1) {
3581 TALLOC_FREE(frame);
3582 return map_nt_error_from_unix(errno);
3583 }
3584
3585 /* Get the ACL from the path. */
3586 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname->base_name,
3587 SMB_ACL_TYPE_ACCESS, frame);
3588
3589 /* If it's a directory get the default POSIX ACL. */
3590 if(S_ISDIR(smb_fname->st.st_ex_mode)) {
3591 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname->base_name,
3592 SMB_ACL_TYPE_DEFAULT, frame);
3593 def_acl = free_empty_sys_acl(conn, def_acl);
3594 }
3595
3596 pal = load_inherited_info(conn, smb_fname->base_name);
3597
3598 status = posix_get_nt_acl_common(conn,
3599 smb_fname->base_name,
3600 &smb_fname->st,
3601 pal,
3602 posix_acl,
3603 def_acl,
3604 security_info,
3605 mem_ctx,
3606 ppdesc);
3607 TALLOC_FREE(frame);
3608 return status;
3609 }
3610
3611 /****************************************************************************
3612 Try to chown a file. We will be able to chown it under the following conditions.
3613
3614 1) If we have root privileges, then it will just work.
3615 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3616 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3617 4) If we have write permission to the file and dos_filemodes is set
3618 then allow chown to the currently authenticated user.
3619 ****************************************************************************/
3620
3621 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3622 {
3623 NTSTATUS status;
3624
3625 if(!CAN_WRITE(fsp->conn)) {
3626 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3627 }
3628
3629 /* Case (1). */
3630 status = vfs_chown_fsp(fsp, uid, gid);
3631 if (NT_STATUS_IS_OK(status)) {
3632 return status;
3633 }
3634
3635 /* Case (2) / (3) */
3636 if (lp_enable_privileges()) {
3637 bool has_take_ownership_priv = security_token_has_privilege(
3638 get_current_nttok(fsp->conn),
3639 SEC_PRIV_TAKE_OWNERSHIP);
3640 bool has_restore_priv = security_token_has_privilege(
3641 get_current_nttok(fsp->conn),
3642 SEC_PRIV_RESTORE);
3643
3644 if (has_restore_priv) {
3645 ; /* Case (2) */
3646 } else if (has_take_ownership_priv) {
3647 /* Case (3) */
3648 if (uid == get_current_uid(fsp->conn)) {
3649 gid = (gid_t)-1;
3650 } else {
3651 has_take_ownership_priv = false;
3652 }
3653 }
3654
3655 if (has_take_ownership_priv || has_restore_priv) {
3656 become_root();
3657 status = vfs_chown_fsp(fsp, uid, gid);
3658 unbecome_root();
3659 return status;
3660 }
3661 }
3662
3663 /* Case (4). */
3664 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3665 return NT_STATUS_ACCESS_DENIED;
3666 }
3667
3668 /* only allow chown to the current user. This is more secure,
3669 and also copes with the case where the SID in a take ownership ACL is
3670 a local SID on the users workstation
3671 */
3672 if (uid != get_current_uid(fsp->conn)) {
3673 return NT_STATUS_ACCESS_DENIED;
3674 }
3675
3676 become_root();
3677 /* Keep the current file gid the same. */
3678 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3679 unbecome_root();
3680
3681 return status;
3682 }
3683
3684 /****************************************************************************
3685 Reply to set a security descriptor on an fsp. security_info_sent is the
3686 description of the following NT ACL.
3687 This should be the only external function needed for the UNIX style set ACL.
3688 We make a copy of psd_orig as internal functions modify the elements inside
3689 it, even though it's a const pointer.
3690 ****************************************************************************/
3691
3692 NTSTATUS set_nt_acl(files_struct *fsp, uint32_t security_info_sent, const struct security_descriptor *psd_orig)
3693 {
3694 connection_struct *conn = fsp->conn;
3695 uid_t user = (uid_t)-1;
3696 gid_t grp = (gid_t)-1;
3697 struct dom_sid file_owner_sid;
3698 struct dom_sid file_grp_sid;
3699 canon_ace *file_ace_list = NULL;
3700 canon_ace *dir_ace_list = NULL;
3701 bool acl_perms = False;
3702 mode_t orig_mode = (mode_t)0;
3703 NTSTATUS status;
3704 bool set_acl_as_root = false;
3705 bool acl_set_support = false;
3706 bool ret = false;
3707 struct security_descriptor *psd = NULL;
3708
3709 DEBUG(10,("set_nt_acl: called for file %s\n",
3710 fsp_str_dbg(fsp)));
3711
3712 if (!CAN_WRITE(conn)) {
3713 DEBUG(10,("set acl rejected on read-only share\n"));
3714 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3715 }
3716
3717 if (psd_orig == NULL) {
3718 return NT_STATUS_INVALID_PARAMETER;
3719 }
3720
3721 /*
3722 * MS NFS mode, here's the deal: the client merely wants to
3723 * modify the mode, but roundtripping get_acl/set/acl would
3724 * add additional POSIX ACEs. So in case we get a request
3725 * containing a MS NFS mode SID, we do nothing here.
3726 */
3727 if (security_descriptor_with_ms_nfs(psd_orig)) {
3728 return NT_STATUS_OK;
3729 }
3730
3731 psd = security_descriptor_copy(talloc_tos(), psd_orig);
3732 if (psd == NULL) {
3733 return NT_STATUS_NO_MEMORY;
3734 }
3735
3736 /*
3737 * Get the current state of the file.
3738 */
3739
3740 status = vfs_stat_fsp(fsp);
3741 if (!NT_STATUS_IS_OK(status)) {
3742 return status;
3743 }
3744
3745 /* Save the original element we check against. */
3746 orig_mode = fsp->fsp_name->st.st_ex_mode;
3747
3748 /*
3749 * Unpack the user/group/world id's.
3750 */
3751
3752 /* POSIX can't cope with missing owner/group. */
3753 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3754 security_info_sent &= ~SECINFO_OWNER;
3755 }
3756 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3757 security_info_sent &= ~SECINFO_GROUP;
3758 }
3759
3760 /* If UNIX owner is inherited and Windows isn't, then
3761 * setting the UNIX owner based on Windows owner conflicts
3762 * with the inheritance rule
3763 */
3764 if (lp_inherit_owner(SNUM(conn)) == INHERIT_OWNER_UNIX_ONLY) {
3765 security_info_sent &= ~SECINFO_OWNER;
3766 }
3767
3768 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3769 if (!NT_STATUS_IS_OK(status)) {
3770 return status;
3771 }
3772
3773 /*
3774 * Do we need to chown ? If so this must be done first as the incoming
3775 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3776 * Noticed by Simo.
3777 */
3778
3779 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3780 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3781
3782 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3783 fsp_str_dbg(fsp), (unsigned int)user,
3784 (unsigned int)grp));
3785
3786 status = try_chown(fsp, user, grp);
3787 if(!NT_STATUS_IS_OK(status)) {
3788 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3789 "= %s.\n", fsp_str_dbg(fsp),
3790 (unsigned int)user,
3791 (unsigned int)grp,
3792 nt_errstr(status)));
3793 return status;
3794 }
3795
3796 /*
3797 * Recheck the current state of the file, which may have changed.
3798 * (suid/sgid bits, for instance)
3799 */
3800
3801 status = vfs_stat_fsp(fsp);
3802 if (!NT_STATUS_IS_OK(status)) {
3803 return status;
3804 }
3805
3806 /* Save the original element we check against. */
3807 orig_mode = fsp->fsp_name->st.st_ex_mode;
3808
3809 /* If we successfully chowned, we know we must
3810 * be able to set the acl, so do it as root.
3811 */
3812 set_acl_as_root = true;
3813 }
3814
3815 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3816
3817 if((security_info_sent & SECINFO_DACL) &&
3818 (psd->type & SEC_DESC_DACL_PRESENT) &&
3819 (psd->dacl == NULL)) {
3820 struct security_ace ace[3];
3821
3822 /* We can't have NULL DACL in POSIX.
3823 Use owner/group/Everyone -> full access. */
3824
3825 init_sec_ace(&ace[0],
3826 &file_owner_sid,
3827 SEC_ACE_TYPE_ACCESS_ALLOWED,
3828 GENERIC_ALL_ACCESS,
3829 0);
3830 init_sec_ace(&ace[1],
3831 &file_grp_sid,
3832 SEC_ACE_TYPE_ACCESS_ALLOWED,
3833 GENERIC_ALL_ACCESS,
3834 0);
3835 init_sec_ace(&ace[2],
3836 &global_sid_World,
3837 SEC_ACE_TYPE_ACCESS_ALLOWED,
3838 GENERIC_ALL_ACCESS,
3839 0);
3840 psd->dacl = make_sec_acl(talloc_tos(),
3841 NT4_ACL_REVISION,
3842 3,
3843 ace);
3844 if (psd->dacl == NULL) {
3845 return NT_STATUS_NO_MEMORY;
3846 }
3847 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3848 }
3849
3850 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3851 &file_grp_sid, &file_ace_list,
3852 &dir_ace_list, security_info_sent, psd);
3853
3854 /* Ignore W2K traverse DACL set. */
3855 if (!file_ace_list && !dir_ace_list) {
3856 return NT_STATUS_OK;
3857 }
3858
3859 if (!acl_perms) {
3860 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3861 free_canon_ace_list(file_ace_list);
3862 free_canon_ace_list(dir_ace_list);
3863 return NT_STATUS_ACCESS_DENIED;
3864 }
3865
3866 /*
3867 * Only change security if we got a DACL.
3868 */
3869
3870 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3871 free_canon_ace_list(file_ace_list);
3872 free_canon_ace_list(dir_ace_list);
3873 return NT_STATUS_OK;
3874 }
3875
3876 /*
3877 * Try using the POSIX ACL set first. Fall back to chmod if
3878 * we have no ACL support on this filesystem.
3879 */
3880
3881 if (acl_perms && file_ace_list) {
3882 if (set_acl_as_root) {
3883 become_root();
3884 }
3885 ret = set_canon_ace_list(fsp, file_ace_list, false,
3886 &fsp->fsp_name->st, &acl_set_support);
3887 if (set_acl_as_root) {
3888 unbecome_root();
3889 }
3890 if (acl_set_support && ret == false) {
3891 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3892 "%s (%s).\n", fsp_str_dbg(fsp),
3893 strerror(errno)));
3894 free_canon_ace_list(file_ace_list);
3895 free_canon_ace_list(dir_ace_list);
3896 return map_nt_error_from_unix(errno);
3897 }
3898 }
3899
3900 if (acl_perms && acl_set_support && fsp->is_directory) {
3901 if (dir_ace_list) {
3902 if (set_acl_as_root) {
3903 become_root();
3904 }
3905 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3906 &fsp->fsp_name->st,
3907 &acl_set_support);
3908 if (set_acl_as_root) {
3909 unbecome_root();
3910 }
3911 if (ret == false) {
3912 DEBUG(3,("set_nt_acl: failed to set default "
3913 "acl on directory %s (%s).\n",
3914 fsp_str_dbg(fsp), strerror(errno)));
3915 free_canon_ace_list(file_ace_list);
3916 free_canon_ace_list(dir_ace_list);
3917 return map_nt_error_from_unix(errno);
3918 }
3919 } else {
3920 int sret = -1;
3921
3922 /*
3923 * No default ACL - delete one if it exists.
3924 */
3925
3926 if (set_acl_as_root) {
3927 become_root();
3928 }
3929 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3930 fsp->fsp_name->base_name);
3931 if (set_acl_as_root) {
3932 unbecome_root();
3933 }
3934 if (sret == -1) {
3935 if (acl_group_override(conn, fsp->fsp_name)) {
3936 DEBUG(5,("set_nt_acl: acl group "
3937 "control on and current user "
3938 "in file %s primary group. "
3939 "Override delete_def_acl\n",
3940 fsp_str_dbg(fsp)));
3941
3942 become_root();
3943 sret =
3944 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3945 conn,
3946 fsp->fsp_name->base_name);
3947 unbecome_root();
3948 }
3949
3950 if (sret == -1) {
3951 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3952 free_canon_ace_list(file_ace_list);
3953 free_canon_ace_list(dir_ace_list);
3954 return map_nt_error_from_unix(errno);
3955 }
3956 }
3957 }
3958 }
3959
3960 if (acl_set_support) {
3961 if (set_acl_as_root) {
3962 become_root();
3963 }
3964 store_inheritance_attributes(fsp,
3965 file_ace_list,
3966 dir_ace_list,
3967 psd->type);
3968 if (set_acl_as_root) {
3969 unbecome_root();
3970 }
3971 }
3972
3973 /*
3974 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3975 */
3976
3977 if(!acl_set_support && acl_perms) {
3978 mode_t posix_perms;
3979
3980 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3981 free_canon_ace_list(file_ace_list);
3982 free_canon_ace_list(dir_ace_list);
3983 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3984 "posix permissions for file %s.\n",
3985 fsp_str_dbg(fsp)));
3986 return NT_STATUS_ACCESS_DENIED;
3987 }
3988
3989 if (orig_mode != posix_perms) {
3990 int sret = -1;
3991
3992 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3993 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3994
3995 if (set_acl_as_root) {
3996 become_root();
3997 }
3998 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name,
3999 posix_perms);
4000 if (set_acl_as_root) {
4001 unbecome_root();
4002 }
4003 if(sret == -1) {
4004 if (acl_group_override(conn, fsp->fsp_name)) {
4005 DEBUG(5,("set_nt_acl: acl group "
4006 "control on and current user "
4007 "in file %s primary group. "
4008 "Override chmod\n",
4009 fsp_str_dbg(fsp)));
4010
4011 become_root();
4012 sret = SMB_VFS_CHMOD(conn,
4013 fsp->fsp_name,
4014 posix_perms);
4015 unbecome_root();
4016 }
4017
4018 if (sret == -1) {
4019 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4020 "failed. Error = %s.\n",
4021 fsp_str_dbg(fsp),
4022 (unsigned int)posix_perms,
4023 strerror(errno)));
4024 free_canon_ace_list(file_ace_list);
4025 free_canon_ace_list(dir_ace_list);
4026 return map_nt_error_from_unix(errno);
4027 }
4028 }
4029 }
4030 }
4031
4032 free_canon_ace_list(file_ace_list);
4033 free_canon_ace_list(dir_ace_list);
4034
4035 /* Ensure the stat struct in the fsp is correct. */
4036 status = vfs_stat_fsp(fsp);
4037
4038 return NT_STATUS_OK;
4039 }
4040
4041 /****************************************************************************
4042 Get the actual group bits stored on a file with an ACL. Has no effect if
4043 the file has no ACL. Needed in dosmode code where the stat() will return
4044 the mask bits, not the real group bits, for a file with an ACL.
4045 ****************************************************************************/
4046
4047 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4048 {
4049 int entry_id = SMB_ACL_FIRST_ENTRY;
4050 SMB_ACL_ENTRY_T entry;
4051 SMB_ACL_T posix_acl;
4052 int result = -1;
4053
4054 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4055 SMB_ACL_TYPE_ACCESS, talloc_tos());
4056 if (posix_acl == (SMB_ACL_T)NULL)
4057 return -1;
4058
4059 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4060 SMB_ACL_TAG_T tagtype;
4061 SMB_ACL_PERMSET_T permset;
4062
4063 entry_id = SMB_ACL_NEXT_ENTRY;
4064
4065 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4066 break;
4067
4068 if (tagtype == SMB_ACL_GROUP_OBJ) {
4069 if (sys_acl_get_permset(entry, &permset) == -1) {
4070 break;
4071 } else {
4072 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4073 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4074 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4075 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4076 result = 0;
4077 break;
4078 }
4079 }
4080 }
4081 TALLOC_FREE(posix_acl);
4082 return result;
4083 }
4084
4085 /****************************************************************************
4086 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4087 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4088 ****************************************************************************/
4089
4090 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4091 {
4092 int entry_id = SMB_ACL_FIRST_ENTRY;
4093 SMB_ACL_ENTRY_T entry;
4094 int num_entries = 0;
4095
4096 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4097 SMB_ACL_TAG_T tagtype;
4098 SMB_ACL_PERMSET_T permset;
4099 mode_t perms;
4100
4101 entry_id = SMB_ACL_NEXT_ENTRY;
4102
4103 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4104 return -1;
4105
4106 if (sys_acl_get_permset(entry, &permset) == -1)
4107 return -1;
4108
4109 num_entries++;
4110
4111 switch(tagtype) {
4112 case SMB_ACL_USER_OBJ:
4113 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4114 break;
4115 case SMB_ACL_GROUP_OBJ:
4116 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4117 break;
4118 case SMB_ACL_MASK:
4119 /*
4120 * FIXME: The ACL_MASK entry permissions should really be set to
4121 * the union of the permissions of all ACL_USER,
4122 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4123 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4124 */
4125 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4126 break;
4127 case SMB_ACL_OTHER:
4128 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4129 break;
4130 default:
4131 continue;
4132 }
4133
4134 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4135 return -1;
4136
4137 if (sys_acl_set_permset(entry, permset) == -1)
4138 return -1;
4139 }
4140
4141 /*
4142 * If this is a simple 3 element ACL or no elements then it's a standard
4143 * UNIX permission set. Just use chmod...
4144 */
4145
4146 if ((num_entries == 3) || (num_entries == 0))
4147 return -1;
4148
4149 return 0;
4150 }
4151
4152 /****************************************************************************
4153 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4154 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4155 resulting ACL on TO. Note that name is in UNIX character set.
4156 ****************************************************************************/
4157
4158 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4159 {
4160 SMB_ACL_T posix_acl = NULL;
4161 int ret = -1;
4162
4163 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4164 SMB_ACL_TYPE_ACCESS,
4165 talloc_tos())) == NULL)
4166 return -1;
4167
4168 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4169 goto done;
4170
4171 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4172
4173 done:
4174
4175 TALLOC_FREE(posix_acl);
4176 return ret;
4177 }
4178
4179 /****************************************************************************
4180 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4181 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4182 Note that name is in UNIX character set.
4183 ****************************************************************************/
4184
4185 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4186 {
4187 return copy_access_posix_acl(conn, name, name, mode);
4188 }
4189
4190 /****************************************************************************
4191 Check for an existing default POSIX ACL on a directory.
4192 ****************************************************************************/
4193
4194 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4195 {
4196 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4197 SMB_ACL_TYPE_DEFAULT,
4198 talloc_tos());
4199 bool has_acl = False;
4200 SMB_ACL_ENTRY_T entry;
4201
4202 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4203 has_acl = True;
4204 }
4205
4206 if (def_acl) {
4207 TALLOC_FREE(def_acl);
4208 }
4209 return has_acl;
4210 }
4211
4212 /****************************************************************************
4213 If the parent directory has no default ACL but it does have an Access ACL,
4214 inherit this Access ACL to file name.
4215 ****************************************************************************/
4216
4217 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4218 const char *name, mode_t mode)
4219 {
4220 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4221 return 0;
4222
4223 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4224 }
4225
4226 /****************************************************************************
4227 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4228 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4229 ****************************************************************************/
4230
4231 int fchmod_acl(files_struct *fsp, mode_t mode)
4232 {
4233 connection_struct *conn = fsp->conn;
4234 SMB_ACL_T posix_acl = NULL;
4235 int ret = -1;
4236
4237 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4238 return -1;
4239
4240 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4241 goto done;
4242
4243 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4244
4245 done:
4246
4247 TALLOC_FREE(posix_acl);
4248 return ret;
4249 }
4250
4251 /****************************************************************************
4252 Map from wire type to permset.
4253 ****************************************************************************/
4254
4255 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4256 {
4257 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4258 return False;
4259 }
4260
4261 if (sys_acl_clear_perms(*p_permset) == -1) {
4262 return False;
4263 }
4264
4265 if (wire_perm & SMB_POSIX_ACL_READ) {
4266 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4267 return False;
4268 }
4269 }
4270 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4271 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4272 return False;
4273 }
4274 }
4275 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4276 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4277 return False;
4278 }
4279 }
4280 return True;
4281 }
4282
4283 /****************************************************************************
4284 Map from wire type to tagtype.
4285 ****************************************************************************/
4286
4287 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4288 {
4289 switch (wire_tt) {
4290 case SMB_POSIX_ACL_USER_OBJ:
4291 *p_tt = SMB_ACL_USER_OBJ;
4292 break;
4293 case SMB_POSIX_ACL_USER:
4294 *p_tt = SMB_ACL_USER;
4295 break;
4296 case SMB_POSIX_ACL_GROUP_OBJ:
4297 *p_tt = SMB_ACL_GROUP_OBJ;
4298 break;
4299 case SMB_POSIX_ACL_GROUP:
4300 *p_tt = SMB_ACL_GROUP;
4301 break;
4302 case SMB_POSIX_ACL_MASK:
4303 *p_tt = SMB_ACL_MASK;
4304 break;
4305 case SMB_POSIX_ACL_OTHER:
4306 *p_tt = SMB_ACL_OTHER;
4307 break;
4308 default:
4309 return False;
4310 }
4311 return True;
4312 }
4313
4314 /****************************************************************************
4315 Create a new POSIX acl from wire permissions.
4316 FIXME ! How does the share mask/mode fit into this.... ?
4317 ****************************************************************************/
4318
4319 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4320 uint16_t num_acls,
4321 const char *pdata,
4322 TALLOC_CTX *mem_ctx)
4323 {
4324 unsigned int i;
4325 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4326
4327 if (the_acl == NULL) {
4328 return NULL;
4329 }
4330
4331 for (i = 0; i < num_acls; i++) {
4332 SMB_ACL_ENTRY_T the_entry;
4333 SMB_ACL_PERMSET_T the_permset;
4334 SMB_ACL_TAG_T tag_type;
4335
4336 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4337 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4338 i, strerror(errno) ));
4339 goto fail;
4340 }
4341
4342 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4343 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4344 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4345 goto fail;
4346 }
4347
4348 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4349 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4350 i, strerror(errno) ));
4351 goto fail;
4352 }
4353
4354 /* Get the permset pointer from the new ACL entry. */
4355 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4356 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4357 i, strerror(errno) ));
4358 goto fail;
4359 }
4360
4361 /* Map from wire to permissions. */
4362 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4363 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4364 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4365 goto fail;
4366 }
4367
4368 /* Now apply to the new ACL entry. */
4369 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4370 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4371 i, strerror(errno) ));
4372 goto fail;
4373 }
4374
4375 if (tag_type == SMB_ACL_USER) {
4376 uint32_t uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4377 uid_t uid = (uid_t)uidval;
4378 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4379 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4380 (unsigned int)uid, i, strerror(errno) ));
4381 goto fail;
4382 }
4383 }
4384
4385 if (tag_type == SMB_ACL_GROUP) {
4386 uint32_t gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4387 gid_t gid = (uid_t)gidval;
4388 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4389 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4390 (unsigned int)gid, i, strerror(errno) ));
4391 goto fail;
4392 }
4393 }
4394 }
4395
4396 return the_acl;
4397
4398 fail:
4399
4400 if (the_acl != NULL) {
4401 TALLOC_FREE(the_acl);
4402 }
4403 return NULL;
4404 }
4405
4406 /****************************************************************************
4407 Calls from UNIX extensions - Default POSIX ACL set.
4408 If num_def_acls == 0 and not a directory just return. If it is a directory
4409 and num_def_acls == 0 then remove the default acl. Else set the default acl
4410 on the directory.
4411 ****************************************************************************/
4412
4413 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4414 uint16_t num_def_acls, const char *pdata)
4415 {
4416 SMB_ACL_T def_acl = NULL;
4417
4418 if (!S_ISDIR(psbuf->st_ex_mode)) {
4419 if (num_def_acls) {
4420 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4421 errno = EISDIR;
4422 return False;
4423 } else {
4424 return True;
4425 }
4426 }
4427
4428 if (!num_def_acls) {
4429 /* Remove the default ACL. */
4430 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4431 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4432 fname, strerror(errno) ));
4433 return False;
4434 }
4435 return True;
4436 }
4437
4438 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4439 pdata,
4440 talloc_tos())) == NULL) {
4441 return False;
4442 }
4443
4444 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4445 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4446 fname, strerror(errno) ));
4447 TALLOC_FREE(def_acl);
4448 return False;
4449 }
4450
4451 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4452 TALLOC_FREE(def_acl);
4453 return True;
4454 }
4455
4456 /****************************************************************************
4457 Remove an ACL from a file. As we don't have acl_delete_entry() available
4458 we must read the current acl and copy all entries except MASK, USER and GROUP
4459 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4460 removed.
4461 FIXME ! How does the share mask/mode fit into this.... ?
4462 ****************************************************************************/
4463
4464 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4465 {
4466 SMB_ACL_T file_acl = NULL;
4467 int entry_id = SMB_ACL_FIRST_ENTRY;
4468 SMB_ACL_ENTRY_T entry;
4469 bool ret = False;
4470 /* Create a new ACL with only 3 entries, u/g/w. */
4471 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4472 SMB_ACL_ENTRY_T user_ent = NULL;
4473 SMB_ACL_ENTRY_T group_ent = NULL;
4474 SMB_ACL_ENTRY_T other_ent = NULL;
4475
4476 if (new_file_acl == NULL) {
4477 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4478 return False;
4479 }
4480
4481 /* Now create the u/g/w entries. */
4482 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4483 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4484 fname, strerror(errno) ));
4485 goto done;
4486 }
4487 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4488 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4489 fname, strerror(errno) ));
4490 goto done;
4491 }
4492
4493 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4494 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4495 fname, strerror(errno) ));
4496 goto done;
4497 }
4498 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4499 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4500 fname, strerror(errno) ));
4501 goto done;
4502 }
4503
4504 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4505 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4506 fname, strerror(errno) ));
4507 goto done;
4508 }
4509 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4510 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4511 fname, strerror(errno) ));
4512 goto done;
4513 }
4514
4515 /* Get the current file ACL. */
4516 if (fsp && fsp->fh->fd != -1) {
4517 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4518 } else {
4519 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4520 SMB_ACL_TYPE_ACCESS,
4521 talloc_tos());
4522 }
4523
4524 if (file_acl == NULL) {
4525 /* This is only returned if an error occurred. Even for a file with
4526 no acl a u/g/w acl should be returned. */
4527 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4528 fname, strerror(errno) ));
4529 goto done;
4530 }
4531
4532 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4533 SMB_ACL_TAG_T tagtype;
4534 SMB_ACL_PERMSET_T permset;
4535
4536 entry_id = SMB_ACL_NEXT_ENTRY;
4537
4538 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4539 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4540 fname, strerror(errno) ));
4541 goto done;
4542 }
4543
4544 if (sys_acl_get_permset(entry, &permset) == -1) {
4545 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4546 fname, strerror(errno) ));
4547 goto done;
4548 }
4549
4550 if (tagtype == SMB_ACL_USER_OBJ) {
4551 if (sys_acl_set_permset(user_ent, permset) == -1) {
4552 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4553 fname, strerror(errno) ));
4554 }
4555 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4556 if (sys_acl_set_permset(group_ent, permset) == -1) {
4557 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4558 fname, strerror(errno) ));
4559 }
4560 } else if (tagtype == SMB_ACL_OTHER) {
4561 if (sys_acl_set_permset(other_ent, permset) == -1) {
4562 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4563 fname, strerror(errno) ));
4564 }
4565 }
4566 }
4567
4568 /* Set the new empty file ACL. */
4569 if (fsp && fsp->fh->fd != -1) {
4570 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4571 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4572 fname, strerror(errno) ));
4573 goto done;
4574 }
4575 } else {
4576 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4577 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4578 fname, strerror(errno) ));
4579 goto done;
4580 }
4581 }
4582
4583 ret = True;
4584
4585 done:
4586
4587 if (file_acl) {
4588 TALLOC_FREE(file_acl);
4589 }
4590 if (new_file_acl) {
4591 TALLOC_FREE(new_file_acl);
4592 }
4593 return ret;
4594 }
4595
4596 /****************************************************************************
4597 Calls from UNIX extensions - POSIX ACL set.
4598 If num_def_acls == 0 then read/modify/write acl after removing all entries
4599 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4600 ****************************************************************************/
4601
4602 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16_t num_acls, const char *pdata)
4603 {
4604 SMB_ACL_T file_acl = NULL;
4605
4606 if (!num_acls) {
4607 /* Remove the ACL from the file. */
4608 return remove_posix_acl(conn, fsp, fname);
4609 }
4610
4611 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4612 pdata,
4613 talloc_tos())) == NULL) {
4614 return False;
4615 }
4616
4617 if (fsp && fsp->fh->fd != -1) {
4618 /* The preferred way - use an open fd. */
4619 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4620 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4621 fname, strerror(errno) ));
4622 TALLOC_FREE(file_acl);
4623 return False;
4624 }
4625 } else {
4626 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4627 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4628 fname, strerror(errno) ));
4629 TALLOC_FREE(file_acl);
4630 return False;
4631 }
4632 }
4633
4634 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4635 TALLOC_FREE(file_acl);
4636 return True;
4637 }
4638
4639 /********************************************************************
4640 Pull the NT ACL from a file on disk or the OpenEventlog() access
4641 check. Caller is responsible for freeing the returned security
4642 descriptor via TALLOC_FREE(). This is designed for dealing with
4643 user space access checks in smbd outside of the VFS. For example,
4644 checking access rights in OpenEventlog() or from python.
4645
4646 ********************************************************************/
4647
4648 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4649 uint32_t security_info_wanted,
4650 struct security_descriptor **sd)
4651 {
4652 TALLOC_CTX *frame = talloc_stackframe();
4653 connection_struct *conn;
4654 NTSTATUS status = NT_STATUS_OK;
4655 struct smb_filename *smb_fname = synthetic_smb_fname(talloc_tos(),
4656 fname,
4657 NULL,
4658 NULL,
4659 0);
4660
4661 if (smb_fname == NULL) {
4662 TALLOC_FREE(frame);
4663 return NT_STATUS_NO_MEMORY;
4664 }
4665
4666 if (!posix_locking_init(false)) {
4667 TALLOC_FREE(frame);
4668 return NT_STATUS_NO_MEMORY;
4669 }
4670
4671 status = create_conn_struct(ctx,
4672 server_event_context(),
4673 server_messaging_context(),
4674 &conn,
4675 -1,
4676 "/",
4677 NULL);
4678
4679 if (!NT_STATUS_IS_OK(status)) {
4680 DEBUG(0,("create_conn_struct returned %s.\n",
4681 nt_errstr(status)));
4682 TALLOC_FREE(frame);
4683 return status;
4684 }
4685
4686 status = SMB_VFS_GET_NT_ACL(conn,
4687 smb_fname,
4688 security_info_wanted,
4689 ctx,
4690 sd);
4691 if (!NT_STATUS_IS_OK(status)) {
4692 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4693 nt_errstr(status)));
4694 }
4695
4696 conn_free(conn);
4697 TALLOC_FREE(frame);
4698
4699 return status;
4700 }
4701
4702 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4703 const char *path_p,
4704 TALLOC_CTX *mem_ctx,
4705 char **blob_description,
4706 DATA_BLOB *blob)
4707 {
4708 int ret;
4709 TALLOC_CTX *frame = talloc_stackframe();
4710 /* Initialise this to zero, in a portable way */
4711 struct smb_acl_wrapper acl_wrapper = {
4712 NULL
4713 };
4714 struct smb_filename *smb_fname;
4715
4716 smb_fname = synthetic_smb_fname(frame, path_p, NULL, NULL, 0);
4717 if (smb_fname == NULL) {
4718 TALLOC_FREE(frame);
4719 errno = ENOMEM;
4720 return -1;
4721 }
4722
4723 acl_wrapper.access_acl
4724 = smb_vfs_call_sys_acl_get_file(handle,
4725 path_p,
4726 SMB_ACL_TYPE_ACCESS,
4727 frame);
4728
4729 ret = smb_vfs_call_stat(handle, smb_fname);
4730 if (ret == -1) {
4731 TALLOC_FREE(frame);
4732 return -1;
4733 }
4734
4735 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4736 acl_wrapper.default_acl
4737 = smb_vfs_call_sys_acl_get_file(handle,
4738 path_p,
4739 SMB_ACL_TYPE_DEFAULT,
4740 frame);
4741 }
4742
4743 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4744 acl_wrapper.group = smb_fname->st.st_ex_gid;
4745 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4746
4747 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4748 &acl_wrapper,
4749 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4750 errno = EINVAL;
4751 TALLOC_FREE(frame);
4752 return -1;
4753 }
4754
4755 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4756 if (!*blob_description) {
4757 errno = EINVAL;
4758 TALLOC_FREE(frame);
4759 return -1;
4760 }
4761
4762 TALLOC_FREE(frame);
4763 return 0;
4764 }
4765
4766 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4767 files_struct *fsp,
4768 TALLOC_CTX *mem_ctx,
4769 char **blob_description,
4770 DATA_BLOB *blob)
4771 {
4772 SMB_STRUCT_STAT sbuf;
4773 TALLOC_CTX *frame;
4774 struct smb_acl_wrapper acl_wrapper;
4775 int ret;
4776
4777 /* This ensures that we also consider the default ACL */
4778 if (fsp->is_directory || fsp->fh->fd == -1) {
4779 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
4780 mem_ctx, blob_description, blob);
4781 }
4782 frame = talloc_stackframe();
4783
4784 acl_wrapper.default_acl = NULL;
4785
4786 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
4787 SMB_ACL_TYPE_ACCESS, frame);
4788
4789 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4790 if (ret == -1) {
4791 TALLOC_FREE(frame);
4792 return -1;
4793 }
4794
4795 acl_wrapper.owner = sbuf.st_ex_uid;
4796 acl_wrapper.group = sbuf.st_ex_gid;
4797 acl_wrapper.mode = sbuf.st_ex_mode;
4798
4799 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4800 &acl_wrapper,
4801 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4802 errno = EINVAL;
4803 TALLOC_FREE(frame);
4804 return -1;
4805 }
4806
4807 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4808 if (!*blob_description) {
4809 errno = EINVAL;
4810 TALLOC_FREE(frame);
4811 return -1;
4812 }
4813
4814 TALLOC_FREE(frame);
4815 return 0;
4816 }
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