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nfs4acls: Use talloc_realloc()
[Samba.git] / source3 / smbd / posix_acls.c
blobb69e5b492315b367049932674db187d8da78ad3a
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 int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 const char *u_name = uidtoname(pace->unix_ug.id);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.id);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, g_name );
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
866
867 return ret;
868 }
869
870 /****************************************************************************
871 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
872 ****************************************************************************/
873
874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
875 {
876 mode_t ret = 0;
877
878 if (mode & r_mask)
879 ret |= S_IRUSR;
880 if (mode & w_mask)
881 ret |= S_IWUSR;
882 if (mode & x_mask)
883 ret |= S_IXUSR;
884
885 return ret;
886 }
887
888 /****************************************************************************
889 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
890 an SMB_ACL_PERMSET_T.
891 ****************************************************************************/
892
893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (sys_acl_clear_perms(*p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
907 return -1;
908 }
909 return 0;
910 }
911
912 /****************************************************************************
913 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
914 ****************************************************************************/
915
916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same.
953 *
954 * For the IDMAP_BOTH case, we must not merge
955 * the UID and GID ACE values for same SID
956 */
957
958 if (!dir_acl) {
959 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
960 curr_ace->owner_type == curr_ace_outer->owner_type &&
961 (curr_ace->attr == curr_ace_outer->attr));
962 } else {
963 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
964 curr_ace->owner_type == curr_ace_outer->owner_type &&
965 (curr_ace->type == curr_ace_outer->type) &&
966 (curr_ace->attr == curr_ace_outer->attr));
967 }
968
969 if (can_merge) {
970 if( DEBUGLVL( 10 )) {
971 dbgtext("merge_aces: Merging ACE's\n");
972 print_canon_ace( curr_ace_outer, 0);
973 print_canon_ace( curr_ace, 0);
974 }
975
976 /* Merge two allow or two deny ACE's. */
977
978 /* Theoretically we shouldn't merge a dir ACE if
979 * one ACE has the CI flag set, and the other
980 * ACE has the OI flag set, but this is rare
981 * enough we can ignore it. */
982
983 curr_ace_outer->perms |= curr_ace->perms;
984 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
985 DLIST_REMOVE(l_head, curr_ace);
986 TALLOC_FREE(curr_ace);
987 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
988 }
989 }
990 }
991
992 /*
993 * Now go through and mask off allow permissions with deny permissions.
994 * We can delete either the allow or deny here as we know that each SID
995 * appears only once in the list.
996 */
997
998 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
999 canon_ace *curr_ace;
1000 canon_ace *curr_ace_next;
1001
1002 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1003
1004 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1005
1006 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1007
1008 /*
1009 * Subtract ACE's with different entries. Due to the ordering constraints
1010 * we've put on the ACL, we know the deny must be the first one.
1011 */
1012
1013 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1014 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1015 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1016
1017 if( DEBUGLVL( 10 )) {
1018 dbgtext("merge_aces: Masking ACE's\n");
1019 print_canon_ace( curr_ace_outer, 0);
1020 print_canon_ace( curr_ace, 0);
1021 }
1022
1023 curr_ace->perms &= ~curr_ace_outer->perms;
1024
1025 if (curr_ace->perms == 0) {
1026
1027 /*
1028 * The deny overrides the allow. Remove the allow.
1029 */
1030
1031 DLIST_REMOVE(l_head, curr_ace);
1032 TALLOC_FREE(curr_ace);
1033 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1034
1035 } else {
1036
1037 /*
1038 * Even after removing permissions, there
1039 * are still allow permissions - delete the deny.
1040 * It is safe to delete the deny here,
1041 * as we are guarenteed by the deny first
1042 * ordering that all the deny entries for
1043 * this SID have already been merged into one
1044 * before we can get to an allow ace.
1045 */
1046
1047 DLIST_REMOVE(l_head, curr_ace_outer);
1048 TALLOC_FREE(curr_ace_outer);
1049 break;
1050 }
1051 }
1052
1053 } /* end for curr_ace */
1054 } /* end for curr_ace_outer */
1055
1056 /* We may have modified the list. */
1057
1058 *pp_list_head = l_head;
1059 }
1060
1061 /****************************************************************************
1062 Map canon_ace perms to permission bits NT.
1063 The attr element is not used here - we only process deny entries on set,
1064 not get. Deny entries are implicit on get with ace->perms = 0.
1065 ****************************************************************************/
1066
1067 uint32_t map_canon_ace_perms(int snum,
1068 enum security_ace_type *pacl_type,
1069 mode_t perms,
1070 bool directory_ace)
1071 {
1072 uint32_t nt_mask = 0;
1073
1074 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1075
1076 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1077 if (directory_ace) {
1078 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1079 } else {
1080 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1081 }
1082 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1083 /*
1084 * Windows NT refuses to display ACEs with no permissions in them (but
1085 * they are perfectly legal with Windows 2000). If the ACE has empty
1086 * permissions we cannot use 0, so we use the otherwise unused
1087 * WRITE_OWNER permission, which we ignore when we set an ACL.
1088 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1089 * to be changed in the future.
1090 */
1091
1092 nt_mask = 0;
1093 } else {
1094 if (directory_ace) {
1095 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1096 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1097 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1098 } else {
1099 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1100 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1101 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1102 }
1103 }
1104
1105 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1106 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1107 }
1108
1109 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1110 (unsigned int)perms, (unsigned int)nt_mask ));
1111
1112 return nt_mask;
1113 }
1114
1115 /****************************************************************************
1116 Map NT perms to a UNIX mode_t.
1117 ****************************************************************************/
1118
1119 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1120 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1121 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1122
1123 static mode_t map_nt_perms( uint32_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, canon_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, canon_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 int 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, canon_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, canon_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, canon_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 if ((file_ace == NULL) && (dir_ace == NULL)) {
2480 /* W2K traverse DACL set - ignore. */
2481 return True;
2482 }
2483
2484 /*
2485 * Go through the canon_ace list and merge entries
2486 * belonging to identical users of identical allow or deny type.
2487 * We can do this as all deny entries come first, followed by
2488 * all allow entries (we have mandated this before accepting this acl).
2489 */
2490
2491 print_canon_ace_list( "file ace - before merge", file_ace);
2492 merge_aces( &file_ace, false);
2493
2494 print_canon_ace_list( "dir ace - before merge", dir_ace);
2495 merge_aces( &dir_ace, true);
2496
2497 /*
2498 * NT ACLs are order dependent. Go through the acl lists and
2499 * process DENY entries by masking the allow entries.
2500 */
2501
2502 print_canon_ace_list( "file ace - before deny", file_ace);
2503 process_deny_list(fsp->conn, &file_ace);
2504
2505 print_canon_ace_list( "dir ace - before deny", dir_ace);
2506 process_deny_list(fsp->conn, &dir_ace);
2507
2508 /*
2509 * A well formed POSIX file or default ACL has at least 3 entries, a
2510 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2511 * and optionally a mask entry. Ensure this is the case.
2512 */
2513
2514 print_canon_ace_list( "file ace - before valid", file_ace);
2515
2516 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2517 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2518 free_canon_ace_list(file_ace);
2519 free_canon_ace_list(dir_ace);
2520 return False;
2521 }
2522
2523 print_canon_ace_list( "dir ace - before valid", dir_ace);
2524
2525 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2526 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2527 free_canon_ace_list(file_ace);
2528 free_canon_ace_list(dir_ace);
2529 return False;
2530 }
2531
2532 print_canon_ace_list( "file ace - return", file_ace);
2533 print_canon_ace_list( "dir ace - return", dir_ace);
2534
2535 *ppfile_ace = file_ace;
2536 *ppdir_ace = dir_ace;
2537 return True;
2538
2539 }
2540
2541 /******************************************************************************
2542 When returning permissions, try and fit NT display
2543 semantics if possible. Note the the canon_entries here must have been malloced.
2544 The list format should be - first entry = owner, followed by group and other user
2545 entries, last entry = other.
2546
2547 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2548 are not ordered, and match on the most specific entry rather than walking a list,
2549 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2550
2551 Entry 0: owner : deny all except read and write.
2552 Entry 1: owner : allow read and write.
2553 Entry 2: group : deny all except read.
2554 Entry 3: group : allow read.
2555 Entry 4: Everyone : allow read.
2556
2557 But NT cannot display this in their ACL editor !
2558 ********************************************************************************/
2559
2560 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2561 {
2562 canon_ace *l_head = *pp_list_head;
2563 canon_ace *owner_ace = NULL;
2564 canon_ace *other_ace = NULL;
2565 canon_ace *ace = NULL;
2566
2567 for (ace = l_head; ace; ace = ace->next) {
2568 if (ace->type == SMB_ACL_USER_OBJ)
2569 owner_ace = ace;
2570 else if (ace->type == SMB_ACL_OTHER) {
2571 /* Last ace - this is "other" */
2572 other_ace = ace;
2573 }
2574 }
2575
2576 if (!owner_ace || !other_ace) {
2577 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2578 filename ));
2579 return;
2580 }
2581
2582 /*
2583 * The POSIX algorithm applies to owner first, and other last,
2584 * so ensure they are arranged in this order.
2585 */
2586
2587 if (owner_ace) {
2588 DLIST_PROMOTE(l_head, owner_ace);
2589 }
2590
2591 if (other_ace) {
2592 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2593 }
2594
2595 /* We have probably changed the head of the list. */
2596
2597 *pp_list_head = l_head;
2598 }
2599
2600 /****************************************************************************
2601 Create a linked list of canonical ACE entries.
2602 ****************************************************************************/
2603
2604 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2605 const char *fname, SMB_ACL_T posix_acl,
2606 const SMB_STRUCT_STAT *psbuf,
2607 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2608 {
2609 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2610 canon_ace *l_head = NULL;
2611 canon_ace *ace = NULL;
2612 canon_ace *next_ace = NULL;
2613 int entry_id = SMB_ACL_FIRST_ENTRY;
2614 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2615 SMB_ACL_ENTRY_T entry;
2616 size_t ace_count;
2617
2618 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2619 SMB_ACL_TAG_T tagtype;
2620 SMB_ACL_PERMSET_T permset;
2621 struct dom_sid sid;
2622 struct unixid unix_ug;
2623 enum ace_owner owner_type;
2624
2625 entry_id = SMB_ACL_NEXT_ENTRY;
2626
2627 /* Is this a MASK entry ? */
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 ZERO_STRUCTP(ace);
2699 ace->type = tagtype;
2700 ace->perms = convert_permset_to_mode_t(permset);
2701 ace->attr = ALLOW_ACE;
2702 ace->trustee = sid;
2703 ace->unix_ug = unix_ug;
2704 ace->owner_type = owner_type;
2705 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2706
2707 DLIST_ADD(l_head, ace);
2708 }
2709
2710 /*
2711 * This next call will ensure we have at least a user/group/world set.
2712 */
2713
2714 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2715 powner, pgroup,
2716 psbuf))
2717 goto fail;
2718
2719 /*
2720 * Now go through the list, masking the permissions with the
2721 * acl_mask. Ensure all DENY Entries are at the start of the list.
2722 */
2723
2724 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2725
2726 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2727 next_ace = ace->next;
2728
2729 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2730 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2731 ace->perms &= acl_mask;
2732
2733 if (ace->perms == 0) {
2734 DLIST_PROMOTE(l_head, ace);
2735 }
2736
2737 if( DEBUGLVL( 10 ) ) {
2738 print_canon_ace(ace, ace_count);
2739 }
2740 }
2741
2742 arrange_posix_perms(fname,&l_head );
2743
2744 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2745
2746 return l_head;
2747
2748 fail:
2749
2750 free_canon_ace_list(l_head);
2751 return NULL;
2752 }
2753
2754 /****************************************************************************
2755 Check if the current user group list contains a given group.
2756 ****************************************************************************/
2757
2758 bool current_user_in_group(connection_struct *conn, gid_t gid)
2759 {
2760 int i;
2761 const struct security_unix_token *utok = get_current_utok(conn);
2762
2763 for (i = 0; i < utok->ngroups; i++) {
2764 if (utok->groups[i] == gid) {
2765 return True;
2766 }
2767 }
2768
2769 return False;
2770 }
2771
2772 /****************************************************************************
2773 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2774 ****************************************************************************/
2775
2776 static bool acl_group_override(connection_struct *conn,
2777 const struct smb_filename *smb_fname)
2778 {
2779 if ((errno != EPERM) && (errno != EACCES)) {
2780 return false;
2781 }
2782
2783 /* file primary group == user primary or supplementary group */
2784 if (lp_acl_group_control(SNUM(conn)) &&
2785 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2786 return true;
2787 }
2788
2789 /* user has writeable permission */
2790 if (lp_dos_filemode(SNUM(conn)) &&
2791 can_write_to_file(conn, smb_fname)) {
2792 return true;
2793 }
2794
2795 return false;
2796 }
2797
2798 /****************************************************************************
2799 Attempt to apply an ACL to a file or directory.
2800 ****************************************************************************/
2801
2802 static bool set_canon_ace_list(files_struct *fsp,
2803 canon_ace *the_ace,
2804 bool default_ace,
2805 const SMB_STRUCT_STAT *psbuf,
2806 bool *pacl_set_support)
2807 {
2808 connection_struct *conn = fsp->conn;
2809 bool ret = False;
2810 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2811 canon_ace *p_ace;
2812 int i;
2813 SMB_ACL_ENTRY_T mask_entry;
2814 bool got_mask_entry = False;
2815 SMB_ACL_PERMSET_T mask_permset;
2816 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2817 bool needs_mask = False;
2818 mode_t mask_perms = 0;
2819
2820 /* Use the psbuf that was passed in. */
2821 if (psbuf != &fsp->fsp_name->st) {
2822 fsp->fsp_name->st = *psbuf;
2823 }
2824
2825 #if defined(POSIX_ACL_NEEDS_MASK)
2826 /* HP-UX always wants to have a mask (called "class" there). */
2827 needs_mask = True;
2828 #endif
2829
2830 if (the_acl == NULL) {
2831 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2832 return false;
2833 }
2834
2835 if( DEBUGLVL( 10 )) {
2836 dbgtext("set_canon_ace_list: setting ACL:\n");
2837 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2838 print_canon_ace( p_ace, i);
2839 }
2840 }
2841
2842 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2843 SMB_ACL_ENTRY_T the_entry;
2844 SMB_ACL_PERMSET_T the_permset;
2845
2846 /*
2847 * ACLs only "need" an ACL_MASK entry if there are any named user or
2848 * named group entries. But if there is an ACL_MASK entry, it applies
2849 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2850 * so that it doesn't deny (i.e., mask off) any permissions.
2851 */
2852
2853 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2854 needs_mask = True;
2855 mask_perms |= p_ace->perms;
2856 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2857 mask_perms |= p_ace->perms;
2858 }
2859
2860 /*
2861 * Get the entry for this ACE.
2862 */
2863
2864 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2865 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2866 i, strerror(errno) ));
2867 goto fail;
2868 }
2869
2870 if (p_ace->type == SMB_ACL_MASK) {
2871 mask_entry = the_entry;
2872 got_mask_entry = True;
2873 }
2874
2875 /*
2876 * Ok - we now know the ACL calls should be working, don't
2877 * allow fallback to chmod.
2878 */
2879
2880 *pacl_set_support = True;
2881
2882 /*
2883 * Initialise the entry from the canon_ace.
2884 */
2885
2886 /*
2887 * First tell the entry what type of ACE this is.
2888 */
2889
2890 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2891 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2892 i, strerror(errno) ));
2893 goto fail;
2894 }
2895
2896 /*
2897 * Only set the qualifier (user or group id) if the entry is a user
2898 * or group id ACE.
2899 */
2900
2901 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2902 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2903 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2904 i, strerror(errno) ));
2905 goto fail;
2906 }
2907 }
2908
2909 /*
2910 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2911 */
2912
2913 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2914 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2915 i, strerror(errno) ));
2916 goto fail;
2917 }
2918
2919 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2920 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2921 (unsigned int)p_ace->perms, i, strerror(errno) ));
2922 goto fail;
2923 }
2924
2925 /*
2926 * ..and apply them to the entry.
2927 */
2928
2929 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2930 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2931 i, strerror(errno) ));
2932 goto fail;
2933 }
2934
2935 if( DEBUGLVL( 10 ))
2936 print_canon_ace( p_ace, i);
2937
2938 }
2939
2940 if (needs_mask && !got_mask_entry) {
2941 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2942 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2943 goto fail;
2944 }
2945
2946 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2947 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2948 goto fail;
2949 }
2950
2951 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2952 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2953 goto fail;
2954 }
2955
2956 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2957 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2958 goto fail;
2959 }
2960
2961 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2962 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2963 goto fail;
2964 }
2965 }
2966
2967 /*
2968 * Finally apply it to the file or directory.
2969 */
2970
2971 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2972 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2973 the_acl_type, the_acl) == -1) {
2974 /*
2975 * Some systems allow all the above calls and only fail with no ACL support
2976 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2977 */
2978 if (no_acl_syscall_error(errno)) {
2979 *pacl_set_support = False;
2980 }
2981
2982 if (acl_group_override(conn, fsp->fsp_name)) {
2983 int sret;
2984
2985 DEBUG(5,("set_canon_ace_list: acl group "
2986 "control on and current user in file "
2987 "%s primary group.\n",
2988 fsp_str_dbg(fsp)));
2989
2990 become_root();
2991 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2992 fsp->fsp_name->base_name, the_acl_type,
2993 the_acl);
2994 unbecome_root();
2995 if (sret == 0) {
2996 ret = True;
2997 }
2998 }
2999
3000 if (ret == False) {
3001 DEBUG(2,("set_canon_ace_list: "
3002 "sys_acl_set_file type %s failed for "
3003 "file %s (%s).\n",
3004 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3005 "directory default" : "file",
3006 fsp_str_dbg(fsp), strerror(errno)));
3007 goto fail;
3008 }
3009 }
3010 } else {
3011 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3012 /*
3013 * Some systems allow all the above calls and only fail with no ACL support
3014 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3015 */
3016 if (no_acl_syscall_error(errno)) {
3017 *pacl_set_support = False;
3018 }
3019
3020 if (acl_group_override(conn, fsp->fsp_name)) {
3021 int sret;
3022
3023 DEBUG(5,("set_canon_ace_list: acl group "
3024 "control on and current user in file "
3025 "%s primary group.\n",
3026 fsp_str_dbg(fsp)));
3027
3028 become_root();
3029 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3030 unbecome_root();
3031 if (sret == 0) {
3032 ret = True;
3033 }
3034 }
3035
3036 if (ret == False) {
3037 DEBUG(2,("set_canon_ace_list: "
3038 "sys_acl_set_file failed for file %s "
3039 "(%s).\n",
3040 fsp_str_dbg(fsp), strerror(errno)));
3041 goto fail;
3042 }
3043 }
3044 }
3045
3046 ret = True;
3047
3048 fail:
3049
3050 if (the_acl != NULL) {
3051 TALLOC_FREE(the_acl);
3052 }
3053
3054 return ret;
3055 }
3056
3057 /****************************************************************************
3058
3059 ****************************************************************************/
3060
3061 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3062 {
3063 SMB_ACL_ENTRY_T entry;
3064
3065 if (!the_acl)
3066 return NULL;
3067 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3068 TALLOC_FREE(the_acl);
3069 return NULL;
3070 }
3071 return the_acl;
3072 }
3073
3074 /****************************************************************************
3075 Convert a canon_ace to a generic 3 element permission - if possible.
3076 ****************************************************************************/
3077
3078 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3079
3080 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3081 {
3082 size_t ace_count = count_canon_ace_list(file_ace_list);
3083 canon_ace *ace_p;
3084 canon_ace *owner_ace = NULL;
3085 canon_ace *group_ace = NULL;
3086 canon_ace *other_ace = NULL;
3087
3088 if (ace_count != 3) {
3089 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3090 "entries for file %s to convert to posix perms.\n",
3091 fsp_str_dbg(fsp)));
3092 return False;
3093 }
3094
3095 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3096 if (ace_p->owner_type == UID_ACE)
3097 owner_ace = ace_p;
3098 else if (ace_p->owner_type == GID_ACE)
3099 group_ace = ace_p;
3100 else if (ace_p->owner_type == WORLD_ACE)
3101 other_ace = ace_p;
3102 }
3103
3104 if (!owner_ace || !group_ace || !other_ace) {
3105 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3106 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3107 return False;
3108 }
3109
3110 *posix_perms = (mode_t)0;
3111
3112 *posix_perms |= owner_ace->perms;
3113 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3114 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3115 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3116 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3117 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3118 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3119
3120 /* The owner must have at least read access. */
3121
3122 *posix_perms |= S_IRUSR;
3123 if (fsp->is_directory)
3124 *posix_perms |= (S_IWUSR|S_IXUSR);
3125
3126 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3127 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3128 (int)group_ace->perms, (int)other_ace->perms,
3129 (int)*posix_perms, fsp_str_dbg(fsp)));
3130
3131 return True;
3132 }
3133
3134 /****************************************************************************
3135 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3136 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3137 with CI|OI set so it is inherited and also applies to the directory.
3138 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3139 ****************************************************************************/
3140
3141 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3142 {
3143 size_t i, j;
3144
3145 for (i = 0; i < num_aces; i++) {
3146 for (j = i+1; j < num_aces; j++) {
3147 uint32_t i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3148 uint32_t j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3149 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3150 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3151
3152 /* We know the lower number ACE's are file entries. */
3153 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3154 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3155 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3156 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3157 (i_inh == j_inh) &&
3158 (i_flags_ni == 0) &&
3159 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3160 SEC_ACE_FLAG_CONTAINER_INHERIT|
3161 SEC_ACE_FLAG_INHERIT_ONLY))) {
3162 /*
3163 * W2K wants to have access allowed zero access ACE's
3164 * at the end of the list. If the mask is zero, merge
3165 * the non-inherited ACE onto the inherited ACE.
3166 */
3167
3168 if (nt_ace_list[i].access_mask == 0) {
3169 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3170 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3171 if (num_aces - i - 1 > 0)
3172 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3173 sizeof(struct security_ace));
3174
3175 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3176 (unsigned int)i, (unsigned int)j ));
3177 } else {
3178 /*
3179 * These are identical except for the flags.
3180 * Merge the inherited ACE onto the non-inherited ACE.
3181 */
3182
3183 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3184 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3185 if (num_aces - j - 1 > 0)
3186 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3187 sizeof(struct security_ace));
3188
3189 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3190 (unsigned int)j, (unsigned int)i ));
3191 }
3192 num_aces--;
3193 break;
3194 }
3195 }
3196 }
3197
3198 return num_aces;
3199 }
3200
3201 /*
3202 * Add or Replace ACE entry.
3203 * In some cases we need to add a specific ACE for compatibility reasons.
3204 * When doing that we must make sure we are not actually creating a duplicate
3205 * entry. So we need to search whether an ACE entry already exist and eventually
3206 * replacce the access mask, or add a completely new entry if none was found.
3207 *
3208 * This function assumes the array has enough space to add a new entry without
3209 * any reallocation of memory.
3210 */
3211
3212 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3213 const struct dom_sid *sid, enum security_ace_type type,
3214 uint32_t mask, uint8_t flags)
3215 {
3216 int i;
3217
3218 /* first search for a duplicate */
3219 for (i = 0; i < *num_aces; i++) {
3220 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3221 (nt_ace_list[i].flags == flags)) break;
3222 }
3223
3224 if (i < *num_aces) { /* found */
3225 nt_ace_list[i].type = type;
3226 nt_ace_list[i].access_mask = mask;
3227 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3228 i, sid_string_dbg(sid), flags));
3229 return;
3230 }
3231
3232 /* not found, append it */
3233 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3234 }
3235
3236
3237 /****************************************************************************
3238 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3239 the space for the return elements and returns the size needed to return the
3240 security descriptor. This should be the only external function needed for
3241 the UNIX style get ACL.
3242 ****************************************************************************/
3243
3244 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3245 const char *name,
3246 const SMB_STRUCT_STAT *sbuf,
3247 struct pai_val *pal,
3248 SMB_ACL_T posix_acl,
3249 SMB_ACL_T def_acl,
3250 uint32_t security_info,
3251 TALLOC_CTX *mem_ctx,
3252 struct security_descriptor **ppdesc)
3253 {
3254 struct dom_sid owner_sid;
3255 struct dom_sid group_sid;
3256 size_t sd_size = 0;
3257 struct security_acl *psa = NULL;
3258 size_t num_acls = 0;
3259 size_t num_def_acls = 0;
3260 size_t num_aces = 0;
3261 canon_ace *file_ace = NULL;
3262 canon_ace *dir_ace = NULL;
3263 struct security_ace *nt_ace_list = NULL;
3264 size_t num_profile_acls = 0;
3265 struct dom_sid orig_owner_sid;
3266 struct security_descriptor *psd = NULL;
3267 int i;
3268
3269 /*
3270 * Get the owner, group and world SIDs.
3271 */
3272
3273 create_file_sids(sbuf, &owner_sid, &group_sid);
3274
3275 if (lp_profile_acls(SNUM(conn))) {
3276 /* For WXP SP1 the owner must be administrators. */
3277 sid_copy(&orig_owner_sid, &owner_sid);
3278 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3279 sid_copy(&group_sid, &global_sid_Builtin_Users);
3280 num_profile_acls = 3;
3281 }
3282
3283 if (security_info & SECINFO_DACL) {
3284
3285 /*
3286 * In the optimum case Creator Owner and Creator Group would be used for
3287 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3288 * would lead to usability problems under Windows: The Creator entries
3289 * are only available in browse lists of directories and not for files;
3290 * additionally the identity of the owning group couldn't be determined.
3291 * We therefore use those identities only for Default ACLs.
3292 */
3293
3294 /* Create the canon_ace lists. */
3295 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3296 &owner_sid, &group_sid, pal,
3297 SMB_ACL_TYPE_ACCESS);
3298
3299 /* We must have *some* ACLS. */
3300
3301 if (count_canon_ace_list(file_ace) == 0) {
3302 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3303 goto done;
3304 }
3305
3306 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3307 dir_ace = canonicalise_acl(conn, name, def_acl,
3308 sbuf,
3309 &global_sid_Creator_Owner,
3310 &global_sid_Creator_Group,
3311 pal, SMB_ACL_TYPE_DEFAULT);
3312 }
3313
3314 /*
3315 * Create the NT ACE list from the canonical ace lists.
3316 */
3317
3318 {
3319 canon_ace *ace;
3320 enum security_ace_type nt_acl_type;
3321
3322 num_acls = count_canon_ace_list(file_ace);
3323 num_def_acls = count_canon_ace_list(dir_ace);
3324
3325 /* Allocate the ace list. */
3326 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3327 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3328 goto done;
3329 }
3330
3331 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3332
3333 /*
3334 * Create the NT ACE list from the canonical ace lists.
3335 */
3336
3337 for (ace = file_ace; ace != NULL; ace = ace->next) {
3338 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3339 &nt_acl_type,
3340 ace->perms,
3341 S_ISDIR(sbuf->st_ex_mode));
3342 init_sec_ace(&nt_ace_list[num_aces++],
3343 &ace->trustee,
3344 nt_acl_type,
3345 acc,
3346 ace->ace_flags);
3347 }
3348
3349 /* The User must have access to a profile share - even
3350 * if we can't map the SID. */
3351 if (lp_profile_acls(SNUM(conn))) {
3352 add_or_replace_ace(nt_ace_list, &num_aces,
3353 &global_sid_Builtin_Users,
3354 SEC_ACE_TYPE_ACCESS_ALLOWED,
3355 FILE_GENERIC_ALL, 0);
3356 }
3357
3358 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3359 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3360 &nt_acl_type,
3361 ace->perms,
3362 S_ISDIR(sbuf->st_ex_mode));
3363 init_sec_ace(&nt_ace_list[num_aces++],
3364 &ace->trustee,
3365 nt_acl_type,
3366 acc,
3367 ace->ace_flags |
3368 SEC_ACE_FLAG_OBJECT_INHERIT|
3369 SEC_ACE_FLAG_CONTAINER_INHERIT|
3370 SEC_ACE_FLAG_INHERIT_ONLY);
3371 }
3372
3373 /* The User must have access to a profile share - even
3374 * if we can't map the SID. */
3375 if (lp_profile_acls(SNUM(conn))) {
3376 add_or_replace_ace(nt_ace_list, &num_aces,
3377 &global_sid_Builtin_Users,
3378 SEC_ACE_TYPE_ACCESS_ALLOWED,
3379 FILE_GENERIC_ALL,
3380 SEC_ACE_FLAG_OBJECT_INHERIT |
3381 SEC_ACE_FLAG_CONTAINER_INHERIT |
3382 SEC_ACE_FLAG_INHERIT_ONLY);
3383 }
3384
3385 /*
3386 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3387 * Win2K needs this to get the inheritance correct when replacing ACLs
3388 * on a directory tree. Based on work by Jim @ IBM.
3389 */
3390
3391 num_aces = merge_default_aces(nt_ace_list, num_aces);
3392
3393 if (lp_profile_acls(SNUM(conn))) {
3394 for (i = 0; i < num_aces; i++) {
3395 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3396 add_or_replace_ace(nt_ace_list, &num_aces,
3397 &orig_owner_sid,
3398 nt_ace_list[i].type,
3399 nt_ace_list[i].access_mask,
3400 nt_ace_list[i].flags);
3401 break;
3402 }
3403 }
3404 }
3405 }
3406
3407 if (num_aces) {
3408 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3409 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3410 goto done;
3411 }
3412 }
3413 } /* security_info & SECINFO_DACL */
3414
3415 psd = make_standard_sec_desc(mem_ctx,
3416 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3417 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3418 psa,
3419 &sd_size);
3420
3421 if(!psd) {
3422 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3423 sd_size = 0;
3424 goto done;
3425 }
3426
3427 /*
3428 * Windows 2000: The DACL_PROTECTED flag in the security
3429 * descriptor marks the ACL as non-inheriting, i.e., no
3430 * ACEs from higher level directories propagate to this
3431 * ACL. In the POSIX ACL model permissions are only
3432 * inherited at file create time, so ACLs never contain
3433 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3434 * flag doesn't seem to bother Windows NT.
3435 * Always set this if map acl inherit is turned off.
3436 */
3437 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3438 psd->type |= SEC_DESC_DACL_PROTECTED;
3439 } else {
3440 psd->type |= pal->sd_type;
3441 }
3442
3443 if (psd->dacl) {
3444 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3445 }
3446
3447 *ppdesc = psd;
3448
3449 done:
3450
3451 if (posix_acl) {
3452 TALLOC_FREE(posix_acl);
3453 }
3454 if (def_acl) {
3455 TALLOC_FREE(def_acl);
3456 }
3457 free_canon_ace_list(file_ace);
3458 free_canon_ace_list(dir_ace);
3459 free_inherited_info(pal);
3460 TALLOC_FREE(nt_ace_list);
3461
3462 return NT_STATUS_OK;
3463 }
3464
3465 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3466 TALLOC_CTX *mem_ctx,
3467 struct security_descriptor **ppdesc)
3468 {
3469 SMB_STRUCT_STAT sbuf;
3470 SMB_ACL_T posix_acl = NULL;
3471 struct pai_val *pal;
3472 TALLOC_CTX *frame = talloc_stackframe();
3473 NTSTATUS status;
3474
3475 *ppdesc = NULL;
3476
3477 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3478 fsp_str_dbg(fsp)));
3479
3480 /* can it happen that fsp_name == NULL ? */
3481 if (fsp->is_directory || fsp->fh->fd == -1) {
3482 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3483 security_info, mem_ctx, ppdesc);
3484 TALLOC_FREE(frame);
3485 return status;
3486 }
3487
3488 /* Get the stat struct for the owner info. */
3489 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3490 TALLOC_FREE(frame);
3491 return map_nt_error_from_unix(errno);
3492 }
3493
3494 /* Get the ACL from the fd. */
3495 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3496
3497 pal = fload_inherited_info(fsp);
3498
3499 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3500 &sbuf, pal, posix_acl, NULL,
3501 security_info, mem_ctx, ppdesc);
3502 TALLOC_FREE(frame);
3503 return status;
3504 }
3505
3506 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3507 uint32_t security_info,
3508 TALLOC_CTX *mem_ctx,
3509 struct security_descriptor **ppdesc)
3510 {
3511 SMB_ACL_T posix_acl = NULL;
3512 SMB_ACL_T def_acl = NULL;
3513 struct pai_val *pal;
3514 struct smb_filename smb_fname;
3515 int ret;
3516 TALLOC_CTX *frame = talloc_stackframe();
3517 NTSTATUS status;
3518
3519 *ppdesc = NULL;
3520
3521 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3522
3523 ZERO_STRUCT(smb_fname);
3524 smb_fname.base_name = discard_const_p(char, name);
3525
3526 /* Get the stat struct for the owner info. */
3527 if (lp_posix_pathnames()) {
3528 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3529 } else {
3530 ret = SMB_VFS_STAT(conn, &smb_fname);
3531 }
3532
3533 if (ret == -1) {
3534 TALLOC_FREE(frame);
3535 return map_nt_error_from_unix(errno);
3536 }
3537
3538 /* Get the ACL from the path. */
3539 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3540 SMB_ACL_TYPE_ACCESS, frame);
3541
3542 /* If it's a directory get the default POSIX ACL. */
3543 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3544 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3545 SMB_ACL_TYPE_DEFAULT, frame);
3546 def_acl = free_empty_sys_acl(conn, def_acl);
3547 }
3548
3549 pal = load_inherited_info(conn, name);
3550
3551 status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3552 posix_acl, def_acl, security_info,
3553 mem_ctx,
3554 ppdesc);
3555 TALLOC_FREE(frame);
3556 return status;
3557 }
3558
3559 /****************************************************************************
3560 Try to chown a file. We will be able to chown it under the following conditions.
3561
3562 1) If we have root privileges, then it will just work.
3563 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3564 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3565 4) If we have write permission to the file and dos_filemodes is set
3566 then allow chown to the currently authenticated user.
3567 ****************************************************************************/
3568
3569 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3570 {
3571 NTSTATUS status;
3572
3573 if(!CAN_WRITE(fsp->conn)) {
3574 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3575 }
3576
3577 /* Case (1). */
3578 status = vfs_chown_fsp(fsp, uid, gid);
3579 if (NT_STATUS_IS_OK(status)) {
3580 return status;
3581 }
3582
3583 /* Case (2) / (3) */
3584 if (lp_enable_privileges()) {
3585 bool has_take_ownership_priv = security_token_has_privilege(
3586 get_current_nttok(fsp->conn),
3587 SEC_PRIV_TAKE_OWNERSHIP);
3588 bool has_restore_priv = security_token_has_privilege(
3589 get_current_nttok(fsp->conn),
3590 SEC_PRIV_RESTORE);
3591
3592 if (has_restore_priv) {
3593 ; /* Case (2) */
3594 } else if (has_take_ownership_priv) {
3595 /* Case (3) */
3596 if (uid == get_current_uid(fsp->conn)) {
3597 gid = (gid_t)-1;
3598 } else {
3599 has_take_ownership_priv = false;
3600 }
3601 }
3602
3603 if (has_take_ownership_priv || has_restore_priv) {
3604 become_root();
3605 status = vfs_chown_fsp(fsp, uid, gid);
3606 unbecome_root();
3607 return status;
3608 }
3609 }
3610
3611 /* Case (4). */
3612 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3613 return NT_STATUS_ACCESS_DENIED;
3614 }
3615
3616 /* only allow chown to the current user. This is more secure,
3617 and also copes with the case where the SID in a take ownership ACL is
3618 a local SID on the users workstation
3619 */
3620 if (uid != get_current_uid(fsp->conn)) {
3621 return NT_STATUS_ACCESS_DENIED;
3622 }
3623
3624 become_root();
3625 /* Keep the current file gid the same. */
3626 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3627 unbecome_root();
3628
3629 return status;
3630 }
3631
3632 /****************************************************************************
3633 Reply to set a security descriptor on an fsp. security_info_sent is the
3634 description of the following NT ACL.
3635 This should be the only external function needed for the UNIX style set ACL.
3636 We make a copy of psd_orig as internal functions modify the elements inside
3637 it, even though it's a const pointer.
3638 ****************************************************************************/
3639
3640 NTSTATUS set_nt_acl(files_struct *fsp, uint32_t security_info_sent, const struct security_descriptor *psd_orig)
3641 {
3642 connection_struct *conn = fsp->conn;
3643 uid_t user = (uid_t)-1;
3644 gid_t grp = (gid_t)-1;
3645 struct dom_sid file_owner_sid;
3646 struct dom_sid file_grp_sid;
3647 canon_ace *file_ace_list = NULL;
3648 canon_ace *dir_ace_list = NULL;
3649 bool acl_perms = False;
3650 mode_t orig_mode = (mode_t)0;
3651 NTSTATUS status;
3652 bool set_acl_as_root = false;
3653 bool acl_set_support = false;
3654 bool ret = false;
3655 struct security_descriptor *psd = NULL;
3656
3657 DEBUG(10,("set_nt_acl: called for file %s\n",
3658 fsp_str_dbg(fsp)));
3659
3660 if (!CAN_WRITE(conn)) {
3661 DEBUG(10,("set acl rejected on read-only share\n"));
3662 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3663 }
3664
3665 if (psd_orig == NULL) {
3666 return NT_STATUS_INVALID_PARAMETER;
3667 }
3668
3669 /*
3670 * MS NFS mode, here's the deal: the client merely wants to
3671 * modify the mode, but roundtripping get_acl/set/acl would
3672 * add additional POSIX ACEs. So in case we get a request
3673 * containing a MS NFS mode SID, we do nothing here.
3674 */
3675 if (security_descriptor_with_ms_nfs(psd_orig)) {
3676 return NT_STATUS_OK;
3677 }
3678
3679 psd = security_descriptor_copy(talloc_tos(), psd_orig);
3680 if (psd == NULL) {
3681 return NT_STATUS_NO_MEMORY;
3682 }
3683
3684 /*
3685 * Get the current state of the file.
3686 */
3687
3688 status = vfs_stat_fsp(fsp);
3689 if (!NT_STATUS_IS_OK(status)) {
3690 return status;
3691 }
3692
3693 /* Save the original element we check against. */
3694 orig_mode = fsp->fsp_name->st.st_ex_mode;
3695
3696 /*
3697 * Unpack the user/group/world id's.
3698 */
3699
3700 /* POSIX can't cope with missing owner/group. */
3701 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3702 security_info_sent &= ~SECINFO_OWNER;
3703 }
3704 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3705 security_info_sent &= ~SECINFO_GROUP;
3706 }
3707
3708 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3709 if (!NT_STATUS_IS_OK(status)) {
3710 return status;
3711 }
3712
3713 /*
3714 * Do we need to chown ? If so this must be done first as the incoming
3715 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3716 * Noticed by Simo.
3717 */
3718
3719 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3720 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3721
3722 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3723 fsp_str_dbg(fsp), (unsigned int)user,
3724 (unsigned int)grp));
3725
3726 status = try_chown(fsp, user, grp);
3727 if(!NT_STATUS_IS_OK(status)) {
3728 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3729 "= %s.\n", fsp_str_dbg(fsp),
3730 (unsigned int)user,
3731 (unsigned int)grp,
3732 nt_errstr(status)));
3733 return status;
3734 }
3735
3736 /*
3737 * Recheck the current state of the file, which may have changed.
3738 * (suid/sgid bits, for instance)
3739 */
3740
3741 status = vfs_stat_fsp(fsp);
3742 if (!NT_STATUS_IS_OK(status)) {
3743 return status;
3744 }
3745
3746 /* Save the original element we check against. */
3747 orig_mode = fsp->fsp_name->st.st_ex_mode;
3748
3749 /* If we successfully chowned, we know we must
3750 * be able to set the acl, so do it as root.
3751 */
3752 set_acl_as_root = true;
3753 }
3754
3755 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3756
3757 if((security_info_sent & SECINFO_DACL) &&
3758 (psd->type & SEC_DESC_DACL_PRESENT) &&
3759 (psd->dacl == NULL)) {
3760 struct security_ace ace[3];
3761
3762 /* We can't have NULL DACL in POSIX.
3763 Use owner/group/Everyone -> full access. */
3764
3765 init_sec_ace(&ace[0],
3766 &file_owner_sid,
3767 SEC_ACE_TYPE_ACCESS_ALLOWED,
3768 GENERIC_ALL_ACCESS,
3769 0);
3770 init_sec_ace(&ace[1],
3771 &file_grp_sid,
3772 SEC_ACE_TYPE_ACCESS_ALLOWED,
3773 GENERIC_ALL_ACCESS,
3774 0);
3775 init_sec_ace(&ace[2],
3776 &global_sid_World,
3777 SEC_ACE_TYPE_ACCESS_ALLOWED,
3778 GENERIC_ALL_ACCESS,
3779 0);
3780 psd->dacl = make_sec_acl(talloc_tos(),
3781 NT4_ACL_REVISION,
3782 3,
3783 ace);
3784 if (psd->dacl == NULL) {
3785 return NT_STATUS_NO_MEMORY;
3786 }
3787 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3788 }
3789
3790 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3791 &file_grp_sid, &file_ace_list,
3792 &dir_ace_list, security_info_sent, psd);
3793
3794 /* Ignore W2K traverse DACL set. */
3795 if (!file_ace_list && !dir_ace_list) {
3796 return NT_STATUS_OK;
3797 }
3798
3799 if (!acl_perms) {
3800 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3801 free_canon_ace_list(file_ace_list);
3802 free_canon_ace_list(dir_ace_list);
3803 return NT_STATUS_ACCESS_DENIED;
3804 }
3805
3806 /*
3807 * Only change security if we got a DACL.
3808 */
3809
3810 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3811 free_canon_ace_list(file_ace_list);
3812 free_canon_ace_list(dir_ace_list);
3813 return NT_STATUS_OK;
3814 }
3815
3816 /*
3817 * Try using the POSIX ACL set first. Fall back to chmod if
3818 * we have no ACL support on this filesystem.
3819 */
3820
3821 if (acl_perms && file_ace_list) {
3822 if (set_acl_as_root) {
3823 become_root();
3824 }
3825 ret = set_canon_ace_list(fsp, file_ace_list, false,
3826 &fsp->fsp_name->st, &acl_set_support);
3827 if (set_acl_as_root) {
3828 unbecome_root();
3829 }
3830 if (acl_set_support && ret == false) {
3831 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3832 "%s (%s).\n", fsp_str_dbg(fsp),
3833 strerror(errno)));
3834 free_canon_ace_list(file_ace_list);
3835 free_canon_ace_list(dir_ace_list);
3836 return map_nt_error_from_unix(errno);
3837 }
3838 }
3839
3840 if (acl_perms && acl_set_support && fsp->is_directory) {
3841 if (dir_ace_list) {
3842 if (set_acl_as_root) {
3843 become_root();
3844 }
3845 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3846 &fsp->fsp_name->st,
3847 &acl_set_support);
3848 if (set_acl_as_root) {
3849 unbecome_root();
3850 }
3851 if (ret == false) {
3852 DEBUG(3,("set_nt_acl: failed to set default "
3853 "acl on directory %s (%s).\n",
3854 fsp_str_dbg(fsp), strerror(errno)));
3855 free_canon_ace_list(file_ace_list);
3856 free_canon_ace_list(dir_ace_list);
3857 return map_nt_error_from_unix(errno);
3858 }
3859 } else {
3860 int sret = -1;
3861
3862 /*
3863 * No default ACL - delete one if it exists.
3864 */
3865
3866 if (set_acl_as_root) {
3867 become_root();
3868 }
3869 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3870 fsp->fsp_name->base_name);
3871 if (set_acl_as_root) {
3872 unbecome_root();
3873 }
3874 if (sret == -1) {
3875 if (acl_group_override(conn, fsp->fsp_name)) {
3876 DEBUG(5,("set_nt_acl: acl group "
3877 "control on and current user "
3878 "in file %s primary group. "
3879 "Override delete_def_acl\n",
3880 fsp_str_dbg(fsp)));
3881
3882 become_root();
3883 sret =
3884 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3885 conn,
3886 fsp->fsp_name->base_name);
3887 unbecome_root();
3888 }
3889
3890 if (sret == -1) {
3891 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3892 free_canon_ace_list(file_ace_list);
3893 free_canon_ace_list(dir_ace_list);
3894 return map_nt_error_from_unix(errno);
3895 }
3896 }
3897 }
3898 }
3899
3900 if (acl_set_support) {
3901 if (set_acl_as_root) {
3902 become_root();
3903 }
3904 store_inheritance_attributes(fsp,
3905 file_ace_list,
3906 dir_ace_list,
3907 psd->type);
3908 if (set_acl_as_root) {
3909 unbecome_root();
3910 }
3911 }
3912
3913 /*
3914 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3915 */
3916
3917 if(!acl_set_support && acl_perms) {
3918 mode_t posix_perms;
3919
3920 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3921 free_canon_ace_list(file_ace_list);
3922 free_canon_ace_list(dir_ace_list);
3923 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3924 "posix permissions for file %s.\n",
3925 fsp_str_dbg(fsp)));
3926 return NT_STATUS_ACCESS_DENIED;
3927 }
3928
3929 if (orig_mode != posix_perms) {
3930 int sret = -1;
3931
3932 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3933 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3934
3935 if (set_acl_as_root) {
3936 become_root();
3937 }
3938 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
3939 posix_perms);
3940 if (set_acl_as_root) {
3941 unbecome_root();
3942 }
3943 if(sret == -1) {
3944 if (acl_group_override(conn, fsp->fsp_name)) {
3945 DEBUG(5,("set_nt_acl: acl group "
3946 "control on and current user "
3947 "in file %s primary group. "
3948 "Override chmod\n",
3949 fsp_str_dbg(fsp)));
3950
3951 become_root();
3952 sret = SMB_VFS_CHMOD(conn,
3953 fsp->fsp_name->base_name,
3954 posix_perms);
3955 unbecome_root();
3956 }
3957
3958 if (sret == -1) {
3959 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3960 "failed. Error = %s.\n",
3961 fsp_str_dbg(fsp),
3962 (unsigned int)posix_perms,
3963 strerror(errno)));
3964 free_canon_ace_list(file_ace_list);
3965 free_canon_ace_list(dir_ace_list);
3966 return map_nt_error_from_unix(errno);
3967 }
3968 }
3969 }
3970 }
3971
3972 free_canon_ace_list(file_ace_list);
3973 free_canon_ace_list(dir_ace_list);
3974
3975 /* Ensure the stat struct in the fsp is correct. */
3976 status = vfs_stat_fsp(fsp);
3977
3978 return NT_STATUS_OK;
3979 }
3980
3981 /****************************************************************************
3982 Get the actual group bits stored on a file with an ACL. Has no effect if
3983 the file has no ACL. Needed in dosmode code where the stat() will return
3984 the mask bits, not the real group bits, for a file with an ACL.
3985 ****************************************************************************/
3986
3987 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3988 {
3989 int entry_id = SMB_ACL_FIRST_ENTRY;
3990 SMB_ACL_ENTRY_T entry;
3991 SMB_ACL_T posix_acl;
3992 int result = -1;
3993
3994 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
3995 SMB_ACL_TYPE_ACCESS, talloc_tos());
3996 if (posix_acl == (SMB_ACL_T)NULL)
3997 return -1;
3998
3999 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4000 SMB_ACL_TAG_T tagtype;
4001 SMB_ACL_PERMSET_T permset;
4002
4003 entry_id = SMB_ACL_NEXT_ENTRY;
4004
4005 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4006 break;
4007
4008 if (tagtype == SMB_ACL_GROUP_OBJ) {
4009 if (sys_acl_get_permset(entry, &permset) == -1) {
4010 break;
4011 } else {
4012 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4013 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4014 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4015 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4016 result = 0;
4017 break;
4018 }
4019 }
4020 }
4021 TALLOC_FREE(posix_acl);
4022 return result;
4023 }
4024
4025 /****************************************************************************
4026 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4027 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4028 ****************************************************************************/
4029
4030 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4031 {
4032 int entry_id = SMB_ACL_FIRST_ENTRY;
4033 SMB_ACL_ENTRY_T entry;
4034 int num_entries = 0;
4035
4036 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4037 SMB_ACL_TAG_T tagtype;
4038 SMB_ACL_PERMSET_T permset;
4039 mode_t perms;
4040
4041 entry_id = SMB_ACL_NEXT_ENTRY;
4042
4043 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4044 return -1;
4045
4046 if (sys_acl_get_permset(entry, &permset) == -1)
4047 return -1;
4048
4049 num_entries++;
4050
4051 switch(tagtype) {
4052 case SMB_ACL_USER_OBJ:
4053 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4054 break;
4055 case SMB_ACL_GROUP_OBJ:
4056 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4057 break;
4058 case SMB_ACL_MASK:
4059 /*
4060 * FIXME: The ACL_MASK entry permissions should really be set to
4061 * the union of the permissions of all ACL_USER,
4062 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4063 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4064 */
4065 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4066 break;
4067 case SMB_ACL_OTHER:
4068 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4069 break;
4070 default:
4071 continue;
4072 }
4073
4074 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4075 return -1;
4076
4077 if (sys_acl_set_permset(entry, permset) == -1)
4078 return -1;
4079 }
4080
4081 /*
4082 * If this is a simple 3 element ACL or no elements then it's a standard
4083 * UNIX permission set. Just use chmod...
4084 */
4085
4086 if ((num_entries == 3) || (num_entries == 0))
4087 return -1;
4088
4089 return 0;
4090 }
4091
4092 /****************************************************************************
4093 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4094 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4095 resulting ACL on TO. Note that name is in UNIX character set.
4096 ****************************************************************************/
4097
4098 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4099 {
4100 SMB_ACL_T posix_acl = NULL;
4101 int ret = -1;
4102
4103 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4104 SMB_ACL_TYPE_ACCESS,
4105 talloc_tos())) == NULL)
4106 return -1;
4107
4108 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4109 goto done;
4110
4111 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4112
4113 done:
4114
4115 TALLOC_FREE(posix_acl);
4116 return ret;
4117 }
4118
4119 /****************************************************************************
4120 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4121 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4122 Note that name is in UNIX character set.
4123 ****************************************************************************/
4124
4125 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4126 {
4127 return copy_access_posix_acl(conn, name, name, mode);
4128 }
4129
4130 /****************************************************************************
4131 Check for an existing default POSIX ACL on a directory.
4132 ****************************************************************************/
4133
4134 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4135 {
4136 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4137 SMB_ACL_TYPE_DEFAULT,
4138 talloc_tos());
4139 bool has_acl = False;
4140 SMB_ACL_ENTRY_T entry;
4141
4142 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4143 has_acl = True;
4144 }
4145
4146 if (def_acl) {
4147 TALLOC_FREE(def_acl);
4148 }
4149 return has_acl;
4150 }
4151
4152 /****************************************************************************
4153 If the parent directory has no default ACL but it does have an Access ACL,
4154 inherit this Access ACL to file name.
4155 ****************************************************************************/
4156
4157 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4158 const char *name, mode_t mode)
4159 {
4160 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4161 return 0;
4162
4163 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4164 }
4165
4166 /****************************************************************************
4167 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4168 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4169 ****************************************************************************/
4170
4171 int fchmod_acl(files_struct *fsp, mode_t mode)
4172 {
4173 connection_struct *conn = fsp->conn;
4174 SMB_ACL_T posix_acl = NULL;
4175 int ret = -1;
4176
4177 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4178 return -1;
4179
4180 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4181 goto done;
4182
4183 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4184
4185 done:
4186
4187 TALLOC_FREE(posix_acl);
4188 return ret;
4189 }
4190
4191 /****************************************************************************
4192 Map from wire type to permset.
4193 ****************************************************************************/
4194
4195 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4196 {
4197 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4198 return False;
4199 }
4200
4201 if (sys_acl_clear_perms(*p_permset) == -1) {
4202 return False;
4203 }
4204
4205 if (wire_perm & SMB_POSIX_ACL_READ) {
4206 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4207 return False;
4208 }
4209 }
4210 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4211 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4212 return False;
4213 }
4214 }
4215 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4216 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4217 return False;
4218 }
4219 }
4220 return True;
4221 }
4222
4223 /****************************************************************************
4224 Map from wire type to tagtype.
4225 ****************************************************************************/
4226
4227 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4228 {
4229 switch (wire_tt) {
4230 case SMB_POSIX_ACL_USER_OBJ:
4231 *p_tt = SMB_ACL_USER_OBJ;
4232 break;
4233 case SMB_POSIX_ACL_USER:
4234 *p_tt = SMB_ACL_USER;
4235 break;
4236 case SMB_POSIX_ACL_GROUP_OBJ:
4237 *p_tt = SMB_ACL_GROUP_OBJ;
4238 break;
4239 case SMB_POSIX_ACL_GROUP:
4240 *p_tt = SMB_ACL_GROUP;
4241 break;
4242 case SMB_POSIX_ACL_MASK:
4243 *p_tt = SMB_ACL_MASK;
4244 break;
4245 case SMB_POSIX_ACL_OTHER:
4246 *p_tt = SMB_ACL_OTHER;
4247 break;
4248 default:
4249 return False;
4250 }
4251 return True;
4252 }
4253
4254 /****************************************************************************
4255 Create a new POSIX acl from wire permissions.
4256 FIXME ! How does the share mask/mode fit into this.... ?
4257 ****************************************************************************/
4258
4259 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4260 uint16_t num_acls,
4261 const char *pdata,
4262 TALLOC_CTX *mem_ctx)
4263 {
4264 unsigned int i;
4265 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4266
4267 if (the_acl == NULL) {
4268 return NULL;
4269 }
4270
4271 for (i = 0; i < num_acls; i++) {
4272 SMB_ACL_ENTRY_T the_entry;
4273 SMB_ACL_PERMSET_T the_permset;
4274 SMB_ACL_TAG_T tag_type;
4275
4276 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4277 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4278 i, strerror(errno) ));
4279 goto fail;
4280 }
4281
4282 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4283 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4284 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4285 goto fail;
4286 }
4287
4288 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4289 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4290 i, strerror(errno) ));
4291 goto fail;
4292 }
4293
4294 /* Get the permset pointer from the new ACL entry. */
4295 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4296 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4297 i, strerror(errno) ));
4298 goto fail;
4299 }
4300
4301 /* Map from wire to permissions. */
4302 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4303 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4304 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4305 goto fail;
4306 }
4307
4308 /* Now apply to the new ACL entry. */
4309 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4310 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4311 i, strerror(errno) ));
4312 goto fail;
4313 }
4314
4315 if (tag_type == SMB_ACL_USER) {
4316 uint32_t uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4317 uid_t uid = (uid_t)uidval;
4318 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4319 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4320 (unsigned int)uid, i, strerror(errno) ));
4321 goto fail;
4322 }
4323 }
4324
4325 if (tag_type == SMB_ACL_GROUP) {
4326 uint32_t gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4327 gid_t gid = (uid_t)gidval;
4328 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4329 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4330 (unsigned int)gid, i, strerror(errno) ));
4331 goto fail;
4332 }
4333 }
4334 }
4335
4336 return the_acl;
4337
4338 fail:
4339
4340 if (the_acl != NULL) {
4341 TALLOC_FREE(the_acl);
4342 }
4343 return NULL;
4344 }
4345
4346 /****************************************************************************
4347 Calls from UNIX extensions - Default POSIX ACL set.
4348 If num_def_acls == 0 and not a directory just return. If it is a directory
4349 and num_def_acls == 0 then remove the default acl. Else set the default acl
4350 on the directory.
4351 ****************************************************************************/
4352
4353 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4354 uint16_t num_def_acls, const char *pdata)
4355 {
4356 SMB_ACL_T def_acl = NULL;
4357
4358 if (!S_ISDIR(psbuf->st_ex_mode)) {
4359 if (num_def_acls) {
4360 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4361 errno = EISDIR;
4362 return False;
4363 } else {
4364 return True;
4365 }
4366 }
4367
4368 if (!num_def_acls) {
4369 /* Remove the default ACL. */
4370 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4371 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4372 fname, strerror(errno) ));
4373 return False;
4374 }
4375 return True;
4376 }
4377
4378 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4379 pdata,
4380 talloc_tos())) == NULL) {
4381 return False;
4382 }
4383
4384 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4385 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4386 fname, strerror(errno) ));
4387 TALLOC_FREE(def_acl);
4388 return False;
4389 }
4390
4391 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4392 TALLOC_FREE(def_acl);
4393 return True;
4394 }
4395
4396 /****************************************************************************
4397 Remove an ACL from a file. As we don't have acl_delete_entry() available
4398 we must read the current acl and copy all entries except MASK, USER and GROUP
4399 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4400 removed.
4401 FIXME ! How does the share mask/mode fit into this.... ?
4402 ****************************************************************************/
4403
4404 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4405 {
4406 SMB_ACL_T file_acl = NULL;
4407 int entry_id = SMB_ACL_FIRST_ENTRY;
4408 SMB_ACL_ENTRY_T entry;
4409 bool ret = False;
4410 /* Create a new ACL with only 3 entries, u/g/w. */
4411 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4412 SMB_ACL_ENTRY_T user_ent = NULL;
4413 SMB_ACL_ENTRY_T group_ent = NULL;
4414 SMB_ACL_ENTRY_T other_ent = NULL;
4415
4416 if (new_file_acl == NULL) {
4417 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4418 return False;
4419 }
4420
4421 /* Now create the u/g/w entries. */
4422 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4423 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4424 fname, strerror(errno) ));
4425 goto done;
4426 }
4427 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4428 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4429 fname, strerror(errno) ));
4430 goto done;
4431 }
4432
4433 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4434 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4435 fname, strerror(errno) ));
4436 goto done;
4437 }
4438 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4439 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4440 fname, strerror(errno) ));
4441 goto done;
4442 }
4443
4444 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4445 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4446 fname, strerror(errno) ));
4447 goto done;
4448 }
4449 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4450 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4451 fname, strerror(errno) ));
4452 goto done;
4453 }
4454
4455 /* Get the current file ACL. */
4456 if (fsp && fsp->fh->fd != -1) {
4457 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4458 } else {
4459 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4460 SMB_ACL_TYPE_ACCESS,
4461 talloc_tos());
4462 }
4463
4464 if (file_acl == NULL) {
4465 /* This is only returned if an error occurred. Even for a file with
4466 no acl a u/g/w acl should be returned. */
4467 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4468 fname, strerror(errno) ));
4469 goto done;
4470 }
4471
4472 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4473 SMB_ACL_TAG_T tagtype;
4474 SMB_ACL_PERMSET_T permset;
4475
4476 entry_id = SMB_ACL_NEXT_ENTRY;
4477
4478 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4479 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4480 fname, strerror(errno) ));
4481 goto done;
4482 }
4483
4484 if (sys_acl_get_permset(entry, &permset) == -1) {
4485 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4486 fname, strerror(errno) ));
4487 goto done;
4488 }
4489
4490 if (tagtype == SMB_ACL_USER_OBJ) {
4491 if (sys_acl_set_permset(user_ent, permset) == -1) {
4492 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4493 fname, strerror(errno) ));
4494 }
4495 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4496 if (sys_acl_set_permset(group_ent, permset) == -1) {
4497 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4498 fname, strerror(errno) ));
4499 }
4500 } else if (tagtype == SMB_ACL_OTHER) {
4501 if (sys_acl_set_permset(other_ent, permset) == -1) {
4502 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4503 fname, strerror(errno) ));
4504 }
4505 }
4506 }
4507
4508 /* Set the new empty file ACL. */
4509 if (fsp && fsp->fh->fd != -1) {
4510 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4511 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4512 fname, strerror(errno) ));
4513 goto done;
4514 }
4515 } else {
4516 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4517 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4518 fname, strerror(errno) ));
4519 goto done;
4520 }
4521 }
4522
4523 ret = True;
4524
4525 done:
4526
4527 if (file_acl) {
4528 TALLOC_FREE(file_acl);
4529 }
4530 if (new_file_acl) {
4531 TALLOC_FREE(new_file_acl);
4532 }
4533 return ret;
4534 }
4535
4536 /****************************************************************************
4537 Calls from UNIX extensions - POSIX ACL set.
4538 If num_def_acls == 0 then read/modify/write acl after removing all entries
4539 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4540 ****************************************************************************/
4541
4542 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16_t num_acls, const char *pdata)
4543 {
4544 SMB_ACL_T file_acl = NULL;
4545
4546 if (!num_acls) {
4547 /* Remove the ACL from the file. */
4548 return remove_posix_acl(conn, fsp, fname);
4549 }
4550
4551 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4552 pdata,
4553 talloc_tos())) == NULL) {
4554 return False;
4555 }
4556
4557 if (fsp && fsp->fh->fd != -1) {
4558 /* The preferred way - use an open fd. */
4559 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4560 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4561 fname, strerror(errno) ));
4562 TALLOC_FREE(file_acl);
4563 return False;
4564 }
4565 } else {
4566 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4567 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4568 fname, strerror(errno) ));
4569 TALLOC_FREE(file_acl);
4570 return False;
4571 }
4572 }
4573
4574 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4575 TALLOC_FREE(file_acl);
4576 return True;
4577 }
4578
4579 /********************************************************************
4580 Pull the NT ACL from a file on disk or the OpenEventlog() access
4581 check. Caller is responsible for freeing the returned security
4582 descriptor via TALLOC_FREE(). This is designed for dealing with
4583 user space access checks in smbd outside of the VFS. For example,
4584 checking access rights in OpenEventlog() or from python.
4585
4586 ********************************************************************/
4587
4588 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4589 uint32_t security_info_wanted,
4590 struct security_descriptor **sd)
4591 {
4592 TALLOC_CTX *frame = talloc_stackframe();
4593 connection_struct *conn;
4594 NTSTATUS status = NT_STATUS_OK;
4595
4596 if (!posix_locking_init(false)) {
4597 TALLOC_FREE(frame);
4598 return NT_STATUS_NO_MEMORY;
4599 }
4600
4601 status = create_conn_struct(ctx,
4602 server_event_context(),
4603 server_messaging_context(),
4604 &conn,
4605 -1,
4606 "/",
4607 NULL);
4608
4609 if (!NT_STATUS_IS_OK(status)) {
4610 DEBUG(0,("create_conn_struct returned %s.\n",
4611 nt_errstr(status)));
4612 TALLOC_FREE(frame);
4613 return status;
4614 }
4615
4616 status = SMB_VFS_GET_NT_ACL(conn, fname, security_info_wanted, ctx, sd);
4617 if (!NT_STATUS_IS_OK(status)) {
4618 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4619 nt_errstr(status)));
4620 }
4621
4622 conn_free(conn);
4623 TALLOC_FREE(frame);
4624
4625 return status;
4626 }
4627
4628 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4629
4630 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4631 const char *name,
4632 SMB_STRUCT_STAT *psbuf,
4633 struct security_descriptor **ppdesc)
4634 {
4635 struct dom_sid owner_sid, group_sid;
4636 size_t size = 0;
4637 struct security_ace aces[4];
4638 uint32_t access_mask = 0;
4639 mode_t mode = psbuf->st_ex_mode;
4640 struct security_acl *new_dacl = NULL;
4641 int idx = 0;
4642
4643 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4644 name, (int)mode ));
4645
4646 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4647 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4648
4649 /*
4650 We provide up to 4 ACEs
4651 - Owner
4652 - Group
4653 - Everyone
4654 - NT System
4655 */
4656
4657 if (mode & S_IRUSR) {
4658 if (mode & S_IWUSR) {
4659 access_mask |= SEC_RIGHTS_FILE_ALL;
4660 } else {
4661 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4662 }
4663 }
4664 if (mode & S_IWUSR) {
4665 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4666 }
4667
4668 init_sec_ace(&aces[idx],
4669 &owner_sid,
4670 SEC_ACE_TYPE_ACCESS_ALLOWED,
4671 access_mask,
4672 0);
4673 idx++;
4674
4675 access_mask = 0;
4676 if (mode & S_IRGRP) {
4677 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4678 }
4679 if (mode & S_IWGRP) {
4680 /* note that delete is not granted - this matches posix behaviour */
4681 access_mask |= SEC_RIGHTS_FILE_WRITE;
4682 }
4683 if (access_mask) {
4684 init_sec_ace(&aces[idx],
4685 &group_sid,
4686 SEC_ACE_TYPE_ACCESS_ALLOWED,
4687 access_mask,
4688 0);
4689 idx++;
4690 }
4691
4692 access_mask = 0;
4693 if (mode & S_IROTH) {
4694 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4695 }
4696 if (mode & S_IWOTH) {
4697 access_mask |= SEC_RIGHTS_FILE_WRITE;
4698 }
4699 if (access_mask) {
4700 init_sec_ace(&aces[idx],
4701 &global_sid_World,
4702 SEC_ACE_TYPE_ACCESS_ALLOWED,
4703 access_mask,
4704 0);
4705 idx++;
4706 }
4707
4708 init_sec_ace(&aces[idx],
4709 &global_sid_System,
4710 SEC_ACE_TYPE_ACCESS_ALLOWED,
4711 SEC_RIGHTS_FILE_ALL,
4712 0);
4713 idx++;
4714
4715 new_dacl = make_sec_acl(ctx,
4716 NT4_ACL_REVISION,
4717 idx,
4718 aces);
4719
4720 if (!new_dacl) {
4721 return NT_STATUS_NO_MEMORY;
4722 }
4723
4724 *ppdesc = make_sec_desc(ctx,
4725 SECURITY_DESCRIPTOR_REVISION_1,
4726 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4727 &owner_sid,
4728 &group_sid,
4729 NULL,
4730 new_dacl,
4731 &size);
4732 if (!*ppdesc) {
4733 return NT_STATUS_NO_MEMORY;
4734 }
4735 return NT_STATUS_OK;
4736 }
4737
4738 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4739 const char *path_p,
4740 TALLOC_CTX *mem_ctx,
4741 char **blob_description,
4742 DATA_BLOB *blob)
4743 {
4744 int ret;
4745 TALLOC_CTX *frame = talloc_stackframe();
4746 /* Initialise this to zero, in a portable way */
4747 struct smb_acl_wrapper acl_wrapper = {
4748 NULL
4749 };
4750 struct smb_filename *smb_fname;
4751
4752 smb_fname = synthetic_smb_fname(frame, path_p, NULL, NULL);
4753 if (smb_fname == NULL) {
4754 TALLOC_FREE(frame);
4755 errno = ENOMEM;
4756 return -1;
4757 }
4758
4759 acl_wrapper.access_acl
4760 = smb_vfs_call_sys_acl_get_file(handle,
4761 path_p,
4762 SMB_ACL_TYPE_ACCESS,
4763 frame);
4764
4765 ret = smb_vfs_call_stat(handle, smb_fname);
4766 if (ret == -1) {
4767 TALLOC_FREE(frame);
4768 return -1;
4769 }
4770
4771 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4772 acl_wrapper.default_acl
4773 = smb_vfs_call_sys_acl_get_file(handle,
4774 path_p,
4775 SMB_ACL_TYPE_DEFAULT,
4776 frame);
4777 }
4778
4779 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4780 acl_wrapper.group = smb_fname->st.st_ex_gid;
4781 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4782
4783 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4784 &acl_wrapper,
4785 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4786 errno = EINVAL;
4787 TALLOC_FREE(frame);
4788 return -1;
4789 }
4790
4791 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4792 if (!*blob_description) {
4793 errno = EINVAL;
4794 TALLOC_FREE(frame);
4795 return -1;
4796 }
4797
4798 TALLOC_FREE(frame);
4799 return 0;
4800 }
4801
4802 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4803 files_struct *fsp,
4804 TALLOC_CTX *mem_ctx,
4805 char **blob_description,
4806 DATA_BLOB *blob)
4807 {
4808 SMB_STRUCT_STAT sbuf;
4809 TALLOC_CTX *frame;
4810 struct smb_acl_wrapper acl_wrapper;
4811 int ret;
4812
4813 /* This ensures that we also consider the default ACL */
4814 if (fsp->is_directory || fsp->fh->fd == -1) {
4815 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
4816 mem_ctx, blob_description, blob);
4817 }
4818 frame = talloc_stackframe();
4819
4820 acl_wrapper.default_acl = NULL;
4821
4822 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
4823 SMB_ACL_TYPE_ACCESS, frame);
4824
4825 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4826 if (ret == -1) {
4827 TALLOC_FREE(frame);
4828 return -1;
4829 }
4830
4831 acl_wrapper.owner = sbuf.st_ex_uid;
4832 acl_wrapper.group = sbuf.st_ex_gid;
4833 acl_wrapper.mode = sbuf.st_ex_mode;
4834
4835 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4836 &acl_wrapper,
4837 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4838 errno = EINVAL;
4839 TALLOC_FREE(frame);
4840 return -1;
4841 }
4842
4843 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4844 if (!*blob_description) {
4845 errno = EINVAL;
4846 TALLOC_FREE(frame);
4847 return -1;
4848 }
4849
4850 TALLOC_FREE(frame);
4851 return 0;
4852 }
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